Patent Application
20250219238
The present application relates to the field of power battery technologies, and, more particularly, to a battery explosion-proof structure, a battery, and a battery pack.
Cover plates of batteries are generally provided with explosion-proof films, and the explosion-proof films gradually deform with increasing internal pressure until the explosion-proof starts. In related technologies, during a thermal runaway process of the batteries, when the temperature of the batteries rises to a certain stage, internal electrolyte will decompose into combustible gases such as methane. As the temperature of the batteries continues to rise, combustion gases such as oxygen will also decompose inside the batteries. When the internal pressure of the batteries further increases, the explosion-proof films burst. At the moment of the explosion-proof films burst, the combustible gases, the combustion-supporting gases, and substances inside the batteries interact with each other, thereby aggravating a degree of thermal runaway and easily causing the batteries to explode.
In a first aspect, a battery explosion-proof structure is provided by the embodiments of the present application. The battery explosion-proof structure includes a cover plate. The cover plate is provided with a first score and a second score. A thickness of the cover plate at the first score is less than a thickness of the cover plate at the second score. The first score includes a first segment and a second segment connected together. The first segment includes a first end and a second end. The second segment includes a third end and a fourth end. A distance between the first end and the third end is greater than a distance between the second end and the fourth end.
In a second aspect, a battery is provided by the embodiments of the present application. The battery includes the battery explosion-proof structure mentioned above, a wound core, and a housing. The wound core is installed inside the housing. One end of the housing is provided with an opening, and a cover plate is sealed and connected to the housing to seal the opening.
In a third aspect, a battery pack is provided by the embodiments of the present application. The battery pack includes the battery mentioned above.
A battery explosion-proof structure, a battery, and a battery pack are provided by the embodiments of the present application. The following will be explained in conjunction with the attached drawings.
Referring to
In some embodiments, the cover plate 110 has a disc-like structure. A material of the cover plate 110 may be steel, such as SPCC material and stainless-steel material. The stainless-steel material may be SUS410, SUS306, SUS316, SUS430, SUS444, etc. When the SPCC material is used, nickel may be plated on both sides of the cover plate 110. A thickness of each of plating layers may range from 0.3 μm to 8 μm. The thickness of the plating layers on both sides may be the same or different.
It may be understood that since the thickness of the cover plate 110 at the first score 111 is less than the thickness of the cover plate 110 at the second score 112, as the air pressure inside the battery increases, the cover plate 110 at the first score 111 bursts first to discharge combustible substances. Then, the cover plate 110 at the second score 112 bursts again to discharge combustion-supporting substances. The first score 111 includes the first segment 1111 and the second segment 1112 connected together. The first segment 1111 includes the first end 1113 and the second end 1114, and the second segment 1112 includes the third end 1115 and the fourth end 1116. On one side surface of the cover plate 110, the distance between the first end 1113 and the third end 1115 is greater than the distance between the second end 1114 and the fourth end 1116, which is conducive to the burst of the first score 111.
In some embodiments, an angle is defined between the first segment 1111 and the second segment 1112. When the first score 111 bursts, the second end 1114 and the fourth end 1116 burst first, which is conducive to the burst of the first score 111. The cover plate 110 at the first score 111 bursts under a first pressure. The cover plate 110 at the second score 112 bursts under a second pressure, and the first pressure is less than the second pressure, so as to form a secondary pressure relief of the battery. The first burst can discharge combustible gases, and the second burst can discharge the combustion-supporting gases, so as to realize a purpose of time-sharing discharge of the combustible gases and the combustion-supporting gases thereby having good explosion-proof effect.
In some embodiments, referring to
It may be understood that when the air pressure inside the battery rises, the cover plate 110 deforms and bulges to form a hemispherical-shape or a hat-shape. The first score 111 is provided closer to the center of the cover plate 110, so that deformation at the position of the first score 111 is relatively large, which is conducive to the burst of the first score 111.
In some embodiments, referring to
Based on the embodiments mentioned above, referring to
It may be understood that a projection of the first score 111 and the second score 112 on one side surface of the cover plate 110 is enclosed in a closed shape to ensure the pressure relief area. At the same time, after the cover plate 110 at the first score 111 bursts, the cover plate 110 at the second score 112 is broken through at the junction between the first score 111 and the second score 112, which is conducive to the burst of the cover plate 110 at the second score 112, thereby ensuring that the explosion-proof structure can be burst smoothly. A part of the cover plate 110 inside the first score 111 and the second score 112 is completely separated from a part of the cover plate 110 outside the first score 111 and the second score 112, so as to realize a complete burst of the explosion-proof structure. The pressure relief area is large enough to ensure the explosion-proof effect.
In some embodiments, the second score 112 is a closed ring, such as a circular ring or a multilateral ring. The first score 111 is spaced apart from the second score 112.
It may be understood that when the cover plate 110 at the second score 112 bursts, the cover plate 110 on both sides of the second score 112 is completely separated to define a larger pressure relief port, thereby ensuring that the explosion-proof structure can be burst smoothly, realizing the complete burst of the explosion-proof structure, and ensuring the pressure relief effect.
In some embodiments, referring to
A distance between the second end 1114 and the center of the cover plate 110 is the same as a distance between the fourth end 1116 and the center of the cover plate 110. A distance between the first end 1113 and the center of the cover plate 110 is the same as a distance between the third end 1115 and the center of the cover plate 110. That is, the distance between the second end 1114 and the center of the cover plate 110 and the distance between the fourth end 1116 and the center of the cover plate 110 are less than the distance between the first end 1113 and the center of the cover plate 110 and the distance between the third end 1115 and the center of the cover plate 110.
It may be understood that the first score 111 is designed as a Chinese character “eight” shape, and a tip of the first score 111 is close to the center of the cover plate 110. When the cover plate 110 deforms under an action of the air pressure, deformation at the second end 1114 and the fourth end 1116 of the first score 111 is greater than a deformation at the first end 1113 and the third end 1115. Since the distance between the second end 1114 and the fourth end 1116 is small and the deformation is large, the first score 111 extends from the second end 1114 and the fourth end 1116 to the first end 1113 and the third end 1115 when the first score 111 bursts, thereby ensuring a smooth burst of the first score 111, which is conducive to a primary pressure relief.
In other embodiments, the first end 1113 is closer to the center of the cover plate 110 than the second end 1114, the third end 1115 is closer to the center of the cover plate 110 than the fourth end 1116, and the first score 111 protrudes in a direction towards an edge of the cover plate 110.
In some embodiments, referring to
By providing a third segment 1117 for a smooth transition between the first segment 1111 and the second segment 1112, the continuous first score 111 is formed, and a stress on the cover plate 110 at the third segment 1117 is more concentrated. As the air pressure inside the battery increases, the third segment 1117 on the cover plate 110 bursts first, and then extends to the first segment 1111 and the second segment 1112, which burst respectively. This is conducive to the burst of the first score 111 and ensures a smooth start of the primary pressure relief.
Based on the embodiments mentioned above, the first segment 1111, the second segment 1112, and the third segment 1117 are all arc-shaped. Bending directions of the first segment 1111 and the second segment 1112 are different from a bending direction of the third segment 1117.
In other embodiments, the first segment 1111, the second segment 1112, and the third segment 1117 may also be straight lines.
In the embodiments of the present application, by designing that the first segment 1111, the second segment 1112, and the third segment 1117 are arc-shaped, and the bending directions of the first segment 1111 and the second segment 1112 are different from the bending direction of the third segment 1117, so as to ensure that the first segment 1111 and the second segment 1112 are smoothly connected through the third segment 1117, and the first score 111 bursts first at the third segment 1117. Further, the arc-shaped design can increase a length of the first score 111, which increases the burst area, which is conducive to the primary pressure relief.
In some embodiments, referring to
In some embodiments, referring to
In some embodiments, referring to
In some embodiments, referring to
It may be understood that the thicker the thicknesses of the cover plate 110 at the first score 111 and the second score 112, and the greater the pressure required to burst the first score 111 and the second score 112. The thicknesses of the cover plate 110 at the first score 111 and the second score 112 are positively correlated with the pressure required to burst the first score 111 and the second score 112. If the thicknesses of the cover plate 110 at the first score 111 and the second score 112 are thinner, the first score 111 and the second score 112 may burst within a normal operating range of the battery, affecting the performance of the battery. If the thicknesses of the cover plate 110 at the first score 111 and the second score 112 are thicker, the pressure required to burst first score 111 and the second score 112 is greater, causing the battery to explode easily. In s embodiments of the present application embodiment, a thickness range of the cover plate 110 where the first score 111 and the second score 112 are located is designed reasonably, so as to meet the normal operation of the battery, achieve the secondary pressure relief, and prevent the battery from exploding.
In some embodiments, the H1 and the H2 satisfy 5 μm≤H2−H1≤20 μm. A value of the (H2−H1) may be 5 μm, 10 μm, 15 μm, 20 μm, or other unspecified values. The difference between the H2 and the H1 is within a reasonable range to ensure the reliability of the primary and secondary pressure relief.
In some embodiments, referring to
In some embodiments, referring to
In some embodiments, referring to
Referring to
Based on the embodiments mentioned above, referring to
It may be understood that as the air pressure in the battery increases, the cover plate 110 humps and deforms. The heights of the second sub-part 114 and the third sub-part 115 are designed to be higher than the height of the first sub-part 113, so that the cover plate 110 deforms to be the hemispherical-shape or the hat-shape, the space between the cover plate 110 and one end of the wound core is increased, and prevents the air pressure in the battery from increasing sharply and causing the battery to explode.
In some embodiments, referring to
The cover plate 110 is provided with a structure in which the first sub-part 113, the second sub-part 114, the fourth sub-part 116, and the third sub-part 115 are connected in sequence, so that the cover plate 110 can be formed by stamping, which is conducive to the processing and forming of the cover plate 110.
Based on the embodiments mentioned above, the surface of the first sub-part 113 facing the wound core 140 is higher than a surface of the fourth sub-part 116 facing the wound core 140, and the surface of the first sub-part 113 facing away from the wound core 140 is higher than a surface of the fourth sub-part 116 facing away from the wound core 140. The fourth sub-part 116 is configured to connect an electrode of the battery.
It may be understood that the first score 111 and the second score 112 are provided on the second sub-part 114, deformation forces of the first sub-part 113 and the fourth sub-part 116 acts on the first score 111 and the second score 112 during the deformation process of the cover plate 110, which is conducive to the smooth burst of the first score 111 and the second score 112. The fourth sub-part 116 connects to the electrode of the battery, so that the cover plate 110 is charged. Electric potentials at the cover plate 110 and the housing 150 are the same, and there is no potential difference, thereby reducing the risk of the cover plate 110 being corroded and improving the reliability of the battery.
In some embodiments, referring to
In some embodiments, referring to
It may be understood that by the boss 1141 and the sinking table 1141 are disposed on the second sub-part 114, the first score 111 is provided on the sinking table 1141, and the second score 112 is provided on boss 1142. When the air pressure in the battery increases, the cover plate 110 deforms, the first score 111 at the position of the sinking table 1141 is subjected to the force of deformation of the cover plate 110, thereby realizing the directional durst at the position of the first score 11, and ensuring an orderly progress of the secondary pressure relief. A directional burst method of the first score 111 includes two situations. One situation is that the first score 111 is completely burst instantly. Another situation is that the first score 111 has a burst point, and the first score 111 bursts from the burst point until the first score 111 is completely burst. The burst point is at a junction of the boss 1142 and the sinking table 1141 on the first score 111, at any location on the third segment 1117 of the first score 111, or at any location in the area of the sinking table 1141 where the first segment 1111 and the second segment 1112 of the first score 111 burst.
In other embodiments, the surface of the first sub-part 113 facing the wound core 140, the surface of the sinking table 1141 facing the wound core 140, and the surface of the fourth sub-part 116 facing the wound core 140 are at the same height. In addition, the surface of the first sub-part 113 facing away from the wound core 140, a surface of the sinking table 1141 away from the wound core 140, and a surface of the fourth sub-part 116 away from the wound core 140 are located at the same height, which is conducive to the processing and forming of the cover plate 110.
In some embodiments, the surface of the third sub-part 115 facing the wound core 140, the surface of the boss 1142 facing the wound core 140, and the surface of the fourth sub-part 116 facing the wound core 140 are at the same height. In addition, the surface of the third sub-part 115 facing away from the wound core 140, the surface of the boss 1142 facing away from the wound core 140, and the surface of the fourth sub-part 116 facing the wound core 140 are also located at the same height, which is conducive to the processing and forming of the cover plate 110.
In some embodiments, referring to
In some embodiments, referring to
The D2 satisfies D2=D1−2*C*tan (α−90°) and D2>2 mm.
Where the α is an included angle defined between the bottom and one side of the sinking table 1141, and the a satisfies 100°≤α≤170°.
The C is the thickness of the area on the cover plate 110 other than the first score 111 and the second score 112.
A value of the D1 may be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, or other unspecified values. A value of the a may be 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, or other unspecified values. A size of the sinking table 1141 is designed reasonably to ensure the directional burst effect of the battery explosion-proof structure.
In some embodiments, the cover plate 110 at the first score 111 bursts under the first pressure. The cover plate 110 at the second score 112 bursts under the second pressure. The magnitude of the first pressure is P1, and the P1 satisfies 0.5 Mpa<P1<1.5 Mpa. The magnitude of the second pressure is P2, and the P2 satisfies 1.5 Mpa≤P2<2.5 Mpa.
Under normal operating conditions of the battery, the internal pressure of the battery will reach 0.5 Mpa. Generally, the internal pressure increases with the temperature and the electrolyte decomposition for a period of time before the battery triggers thermal runaway. In order to discharge the combustible gases decomposed by the electrolyte and does not affect the normal operation of the battery, the first pressure P1 is set at (0.5 Mpa, 1.5 Mpa), such as 0.6 Mpa, 0.7 Mpa, 0.8 Mpa, 0.9 Mpa, 1.0 Mpa, 1.1 Mpa, 1.2 Mpa, 1.3 Mpa, 1.4 Mpa, or other unspecified values. At an end of the battery thermal runaway period, the battery pressure rises to a certain extent, so that the explosion-proof valve is required to burst and release the internal combustion substances of the battery to prevent the battery from exploding. The second pressure P2 is set at [1.5 Mpa, 2.5 Mpa), such as 1.5 Mpa, 1.6 Mpa, 1.7 Mpa, 1.8 Mpa, 1.9 Mpa, 2.1 Mpa, 2.2 Mpa, 2.3 Mpa, 2.4 Mpa, or other unspecified values.
In some embodiments, cross-sectional shapes of the first score 111 and/or the second score 112 are V-shaped, semicircular-shaped, trapezoidal-shaped, U-shaped, or parabolic-shaped along the thickness direction of the cover plate 110. The cross-sectional shapes of the first score 111 and the second score 112 on the cover plate 110 are the same or different. The cross-sectional shapes are diverse, which is convenient for processing.
In some embodiments, the thickness H2 of the cover plate 110 at the second score (112) is calculated according to a formula (1) as follows:
Where the Q is a tensile strength of a material prepared for the cover plate 110, the E1 is an outer diameter of an annular ring where the second score is located, and the P2 is a pressure to burst the cover plate 110 at the second score 112.
The thickness H2 of the cover plate 110 at the second score 112 is calculated by using the above-mentioned formula (1). The second score 112 is designed according to different positions and material characteristics. Further, the thickness H1 of the cover plate 110 at the first score 111 is designed according to the second score 112, which is convenient for design, accurate for calculation results, and ensures the performance of the cover plate 110.
In some embodiments, referring to
In some embodiments, the cover plate 110 includes the first side surface 117 and the second side surface 118 disposed oppositely. The first score 111 and the second score 112 are both provided on the second side surface 118.
In some embodiments, the cover plate 110 includes the first side surface 117 and the second side surface 118 disposed oppositely. The first score 111 is provided on the first side surface 117, and the second score 112 is provided on the second side surface 118.
In some embodiments, the cover plate 110 includes the first side surface 117 and the second side surface 118 disposed oppositely. The first score 111 is provided on the second side surface 118, and the second score 112 is provided on the first side surface 117.
It may be understood that the positions of the first score 111 and the second score 112 on the cover plate 110 are diverse, so as to achieve the purpose of the primary and the secondary pressure relief. The diverse design is convenient for the processing and forming of the first score 111 and the second score 112.
Referring to
Based on the embodiments mentioned above, referring to
In some embodiments, referring to
Based on the embodiments mentioned above, referring to
In other embodiments, the cover plate 110 and the housing 150 are connected by laser welding. The laser welding has advantages such as simple processes and good sealing ability. In this case, the first current collector 160 is directly in contact with the housing 150, so that the housing 150 is negatively charged.
The embodiment of the present application further provides a battery pack including the battery mentioned above. The battery pack has the same technical effects as the battery explosion-proof structure, which will not be repeated herein.
In some embodiments, referring to
A width of each of the baffle plates 132 is greater than or equal to a length of the first score 111. The baffle plates 132 may be flat plates or arc-shaped plates.
It may be understood that as the pressure inside the batteries 100 increases, the first score 111 in the sinking table 1141 bursts, and gases and materials in the batteries 100 are ejected from the first score 111. By providing the baffle plates 132 on the mounting base 130, the baffle plates 132 are located below the sinking table 1141, and a projection of each of the baffle plates 132 on a plane where the cover plate 110 is located is positioned against the first score 111. The baffle plates 132 block the materials ejected from the batteries 100, and prevents the ejected the materials from entering the adjacent battery 100 and polluting the adjacent batteries 100.
As can be seen from
Based on the above-described embodiments, referring to
The following is a detailed description of the technical solutions and the technical effects of the present application by specific embodiments and proportions. The following embodiments are only partial embodiments of the present application, and are not specifically limited to the present application.
A structure of the battery explosion-proof structure in this test group is illustrated below. Referring to
This test group adopts a test method described in Article 6.2. 4 of the GB/T31485-2015 standard.
An evaluation criteria adopted by this test group is illustrated below. A burst time of the first score 112 is T1, a burst time of the second score 112 is T2, and a burst time difference between the first score 111 and the second score 122 is ΔT. The T1 and the T2 meet conditions as follows: 50 seconds≤T1≤100 seconds, 60 seconds≤T2≤150 seconds, and 5 seconds≤ΔT≤50 seconds.
Parameters involved in the cover plate 110 include H1, H2, H2−H1, a, C, E1, L1, L2, L3, and β. The L1 is the same as L2. The parameters of basic group 1 are shown in Table 1.1 below.
According to the validation results of Table 1.1, the burst time of the first score 111 and the burst time of the second score 112 both meet the evaluation criteria, thereby meeting the performance of the explosion-proof structure, and realizing the secondary pressure relief.
Based on the parameters of the basic group 1, changes of the parameters of the cover plate 110 are controlled by a single variable method to set the comparative examples and examples. The changing parameters and the validation results of the comparative examples and the examples are shown in Table 1.2 to Table 1.8.
According to Table 1.2, when the H1 is within the set range and meets the performance requirements of the explosion-proof structure, the secondary pressure relief is achieved. When the H1 is below or exceeds the set range, the burst time of the primary pressure relief and the secondary pressure relief is earlier. When the H1 exceeds the set range, a time interval between the two pressure relief is short, and the pressure relief effect of the explosion-proof structure is not good.
According to Table 1.3, when the (H2−H1) is within the set range and meets the performance requirements of the explosion-proof structure, the secondary pressure relief is achieved. When the (H2−H1) is below the set range, the time interval between the two pressure relief is short. When the (H2−H1) exceeds the set range, the time interval between the two pressure relief is longer, which increases the probability of battery explosion and reduces the secondary pressure relief effect of the explosion-proof structure.
According to Table 1.4, when the L3 is within the set range and meets the performance requirements of the explosion-proof structure, the secondary pressure relief is achieved. When the L3 exceeds the set range, the time interval between the two pressure relief is longer. When the L3 is below the set range, the time interval between the two pressure relief is short, which reduces the secondary pressure relief effect of the explosion-proof structure.
According to Table 1.5, when the L1 and the L2 are within the set range and meets the performance requirements of the explosion-proof structure, the secondary pressure relief is achieved. When the L1 and the L2 are below the set range, the time interval between the two pressure relief is longer When the L1 and the L2 exceed the set range, the time interval between the two pressure relief is short, which reduces the secondary pressure relief effect of the explosion-proof structure.
According to Table 1.5, when the β is within the set range and meets the performance requirements of the explosion-proof structure, the secondary pressure relief is achieved. When the β is below the set range, the time interval between the two pressure relief is longer When the β exceeds the set range, the time interval between the two pressure relief is short, which reduces the secondary pressure relief effect of the explosion-proof structure.
A structure of the battery explosion-proof structure in this test group is illustrated below. Referring to
This test group adopts a test method described in Article 6.2. 4 of the GB/T31485-2015 standard.
An evaluation criteria adopted by this test group is illustrated below. A burst time of the first score 112 is T1, a burst time of the second score 112 is T2, and a burst time difference between the first score 111 and the second score 122 is ΔT. The T1 and the T2 meet conditions as follows: 50 seconds≤T1≤100 seconds, 60 seconds≤T2≤150 seconds, and 5 seconds≤ΔT≤50 seconds.
Parameters involved in the cover plate 110 include H1, H2, H2−H1, a, C, L1, L2, L3, β, B, and E1. A basic group 2 is set. The parameters of the basic group 2 are shown in Table 2.1 below.
According to the validation results of Table 2.1, the burst time of the first score 111 and the burst time of the second score 112 both meet the evaluation criteria, thereby meeting the performance of the explosion-proof structure, and realizing the secondary pressure relief.
Based on the parameters of the basic group 2, changes of the parameters of the cover plate 110 are controlled by a single variable method to set the comparative examples and examples. The changing parameters and the verification results of the comparative examples and the examples are shown in Table 2.2.
According to Table 1.3, when the B is within the set range and meets the performance requirements of the explosion-proof structure, the secondary pressure relief is achieved. When the B is below the set range, the time interval between the two pressure relief is short. When the B exceeds the set range, the time interval between the two pressure relief is longer, which increases the probability of battery explosion and reduces the secondary pressure relief effect of the explosion-proof structure.
A structure of the battery explosion-proof structure in this test group is illustrated below. Referring to
This test group adopts a test method described in Article 6.2. 4 of the GB/T31485-2015 standard.
An evaluation criteria adopted by this test group is illustrated below. A burst time of the first score 112 is T1, a burst time of the second score 112 is T2, and a burst time difference between the first score 111 and the second score 122 is ΔT. The T1 and the T2 meet conditions as follows: 50 seconds≤T1≤100 seconds, 60 seconds≤T2≤150 seconds, and 5 seconds≤ΔT≤50 seconds.
Parameters involved in the cover plate 110 include H1, H2, H2−H1, a, C, E1, L1, L2, L3, β, A, D1, D2, and a.
A basic group 3 is set. The parameters of the basic group 3 are shown in Table 3.1 below.
According to the validation results of Table 3.1, the burst time of the first score 111 and the burst time of the second score 112 both meet the evaluation criteria, thereby meeting the performance of the explosion-proof structure, and realizing the secondary pressure relief.
Based on the parameters of the basic group 3, changes of the parameters of the cover plate 110 are controlled by a single variable method to set the comparative examples and examples. The changing parameters and the verification results of the comparative examples and the examples are shown in Table 3.2.
According to Table 1.3, when the D1 is within the set range and meets the performance requirements of the explosion-proof structure, the secondary pressure relief is achieved. When the D1 is below the set range, the time interval between the two pressure relief is short. When the D1 exceeds the set range, the time interval between the two pressure relief is longer, which increases the probability of battery explosion and reduces the secondary pressure relief effect of the explosion-proof structure.
The beneficial effects of the present application are illustrated below. The battery explosion-proof structure, the battery, and the battery pack are provided by the embodiments of the present application. The cover plate is provided with the first score and the second score. The thickness of the cover plate at the first score is less than the thickness of the cover plate at the second score. The first score includes the first segment and the second segment connected together. The distance between two ends of the first segment and two ends of the second segment is different, which is conducive to the directional burst of the first score. When internal pressure of the battery increases, the first score on the cover plate bursts first, and the second score on the cover plate bursts again to form the secondary pressure relief of the battery. Combustible gases can be discharged during a first burst, and combustion-supporting gases can be discharged during the second burst, so as to achieve the purpose of time-sharing discharge of the combustible gases and the combustion-supporting gases, and avoiding that when the explosion-proof structure explodes, the combustible gas, the combustion gas, and the substance in the battery interact to increase the degree of thermal runaway and easily cause explosion of the battery, thereby improving the reliability of the cover plate, and ensuring the explosion-proof effect.
| Number | Date | Country | Kind |
|---|---|---|---|
| PCT/CN2023/143521 | Dec 2023 | WO | international |
This application claims priority benefits to International Application Application No. PCT/CN2023/143521, filed on Dec. 29, 2023. The contents of the aforementioned application, including any intervening amendments thereto, are incorporated herein by reference.
