Patent Application
20220416336
The present disclosure claims priority to Chinese Patent Application No. 201911367813.3, filed by BYD Co., Ltd. on Dec. 26, 2019 and entitled “COVER PLATE ASSEMBLY, BATTERY, BATTERY MODULE, POWER BATTERY PACK AND ELECTRIC VEHICLE”, which is incorporated herein by reference in its entirety.
The present disclosure relates to the technical field of batteries, and more specifically, to a cover plate assembly, a battery, a battery module, a power battery pack and an electric vehicle.
In related arts, a positive electrode terminal of a battery and a cover plate body are directly connected by laser welding. A battery housing is positively charged, which may prevent corrosion of the housing or an explosion-preventive valve caused by a low voltage of the housing. For battery cores led out to different ends of electrode terminals, a number of voltage sampling wirings and temperature sampling wirings harnessed from the battery can be reduced, thereby reducing costs. However, this method increases the risk of battery leakage and short circuits, which may easily cause arcing, fire, and even explosion accidents.
The present disclosure provides a cover plate assembly, a battery, a battery module, a power battery pack, and an electric vehicle. When a short circuit occurs inside the battery module, the cover plate assembly cuts off the short circuit, which significantly improves the safety of the battery module.
According to a first aspect, an embodiment of the present disclosure provides a cover plate assembly of a battery, including a cover plate body, a first electrode terminal, a second electrode terminal, and a resistive coating. The second electrode terminal is connected with and insulated from the cover plate body. The first electrode terminal is electrically connected with the cover plate body by the resistive coating. The resistive coating includes a weak portion. When a current flowing through the resistive coating is greater than a predetermined threshold, the weak portion is melted to disconnect the cover plate body from the first electrode terminal.
In the cover plate assembly of a battery provided in the embodiment of the present disclosure, the first electrode terminal is electrically connected with the cover plate body by the resistive coating, where the resistive coating includes the weak portion. And when the current flowing through the resistive coating is greater than the predetermined threshold, the weak portion is melted to disconnect the cover plate body from the first electrode terminal. The resistive coating may electrically connect the first electrode terminal to the cover plate body to cause the cover plate body to be charged. In this way, the cover plate body or the explosion-preventive valve may be protected from being corroded, a number of voltage sampling wirings and temperature sampling wirings harnessed from the battery may be reduced, thereby reducing the costs. In addition, when the short circuit occurs inside the battery module, the resistive coating can significantly reduce the short-circuit current, thereby preventing arcing, fire, and even explosion accidents, and improving the safety of the battery module. Moreover, when the current flowing through the resistive coating is greater than the predetermined threshold, the weak portion may be melted by heat generated by itself. In this way, the short circuit may be cut off, and the safety of the battery module may be further ensured. Furthermore, the resistive coating may reduce the space occupied by the entire cover plate assembly, and cause the structure of the cover plate assembly to be more compact, thereby increasing the volume-to-energy density of the battery module.
According to a second aspect, a battery provided in an embodiment of the present disclosure includes the cover plate assembly according to the embodiment of the first aspect of the present disclosure.
According to a third aspect, a battery module provided in an embodiment of the present disclosure includes a battery according to the embodiment of the second aspect of the present disclosure.
According to a fourth aspect, a power battery pack provided in an embodiment of the present disclosure includes a battery module according to the embodiment of the third aspect of the present disclosure.
According to a fifth aspect, an electric vehicle provided in an embodiment of the present disclosure includes the power battery pack according to the embodiment of the fourth aspect of the present disclosure.
The additional aspects and advantages of the present disclosure will be provided in the following description, some of which will become apparent from the following description or may be learned from practice of the present disclosure.
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following descriptions of the embodiments with reference to the accompanying drawings, where:
100: Cover plate assembly; 1: Cover plate body; 11: Mounting hole; 111: Annular disc; 1111: Top portion; 1112: Bottom portion; 1113: Connecting portion; 2: First electrode terminal; 21: Pole; 22: Electrode cap; 3: Resistive coating; 31: First section; 32: Second section; 33: Third section; 331: Weak portion; 4: First insulating member; 5: Cover plate insulating member; 6: Inner lead-out sheet.
Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings. Same or similar reference numerals throughout in all the accompanying drawings indicate same or similar components or components having same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and intended to explain the present disclosure and cannot be construed as a limitation to the present disclosure.
A cover plate assembly 100 of a battery (not shown) according to an embodiment of a first aspect of the present disclosure is described below with reference to
As shown in
For example, in examples of
The first electrode terminal 2 and the second electrode terminal have opposite polarities. For example, the first electrode terminal 2 is a positive electrode terminal, and the second electrode terminal is a negative electrode terminal. In this case, the cover plate body 1 is positively charged. The first electrode terminal is the negative electrode terminal, and the second electrode terminal is the positive electrode terminal. In this case, the cover plate body 1 is negatively charged. The “first and second” in the first electrode terminal 2 and the second electrode terminal are used merely for distinguishing battery cores, and are not used to limit the number. For example, a number of first electrode terminals 2 and a number of second electrode terminals may be respectively arranged.
According to the cover plate assembly 100 of a battery provided in the embodiment of the present disclosure, the first electrode terminal 2 is electrically connected with the cover plate body 1 by the resistive coating 3. The resistive coating 3 includes the weak portion 331. When the current flowing through the resistive coating 3 is greater than the predetermined threshold, the weak portion 331 is melted to disconnect the cover plate body 1 from the first electrode terminal 2. The resistive coating 3 may electrically connect the first electrode terminal 2 to the cover plate body 1 to cause the cover plate body 1 to be charged. In this way, the cover plate body 1 or the explosion-preventive valve may be protected from being corroded. And the number of voltage sampling wirings and temperature sampling wirings harnessed of the battery can be reduced, thereby reducing costs. In addition, when the short circuit occurs inside the battery module, the resistive coating 3 can significantly reduce the short-circuit current, thereby preventing arcing, fire, and even explosion accidents, and improving the safety of the battery module. Moreover, when the current flowing through the resistive coating 3 is greater than the predetermined threshold, the weak portion 331 may be melted by heat generated by itself. In this way, the short circuit may be cut off, and the safety of the battery module may be further ensured. Furthermore, the resistive coating 3 may reduce the space occupied by the entire cover plate assembly 100, and cause the structure of the cover plate assembly 100 to be more compact, thereby increasing the volume-to-energy density of the battery module.
In some embodiments of the present disclosure, referring to
In some embodiments of the present disclosure, with reference to
In some embodiments, a second insulating member (not shown in the figure) may be arranged between the hole wall of the mounting hole 11 and the first electrode terminal 2. Through such an arrangement, a direct electrical connection between the first electrode terminal 2 and the cover plate body 1 may be prevented. Certainly, the present disclosure is not limited thereto. A certain distance may also be predetermined between the hole wall of the mounting hole 11 and the first electrode terminal 2, to prevent direction conduction between the first electrode terminal 2 and the cover plate body 1.
In some embodiments of the present disclosure, referring to
Further, referring to
In a further embodiment of the present disclosure, as shown in
In some embodiments, referring to
In some embodiments, the resistive coating 3 includes a nickel-plated layer. Therefore, due to the strong passivation ability of nickel, an extremely thin passivation film can be rapidly formed on the surface to prevent the corrosion of atmosphere, alkali, and some acid. In this way, the nickel-plated layer has high stability in the air and has desirable conductivity.
In some embodiments, the first insulating member 4 is connected with both the pole 21 and the annular disc 111 by brazing. Through such an arrangement, the first insulating member 4 can be securely connected with the pole 21 and the annular disc 111. In this way, the structural stability of the entire cover plate assembly 100 may be improved, and the service life of the battery may be prolonged.
In some embodiments, as shown in
The battery according to the embodiment of the second aspect of the present disclosure includes the cover plate assembly 100 according to the embodiment of the first aspect of the present disclosure.
According to the battery of the embodiment of the present disclosure, the above cover plate assembly 100 is used to prevent the cover plate or the explosion-preventive valve from being corroded and reduce the number of voltage sampling wirings and temperature sampling wirings harnessed of the battery, thereby reducing the costs. In addition, the safety of the battery can be improved.
The battery module according to the embodiment of the third aspect of the present disclosure includes the battery according to the embodiment of the second aspect of the present disclosure.
For the battery module according to the embodiments of the present disclosure, the above battery is used, and the resistive coating 3 may reduce the short-circuit current when the short circuit occurs inside battery module, thereby preventing occurrence of arcing, fire, and even explosion accidents, and significantly improving the safety of the battery module.
A power battery pack (not shown in the figure) according to the embodiment of the fourth aspect of the present disclosure includes the battery module according to the embodiment of the third aspect of the present disclosure.
For the power battery pack according to the embodiment of the present disclosure, the above battery module is used to improve the safety of the battery module and prevent occurrence of thermal runaway, thereby improving the safety of the entire power battery pack.
An electric vehicle (not shown in the figure) according to the embodiment of the fifth aspect of the present disclosure includes the power battery pack according to the embodiment of the fourth aspect of the present disclosure.
For the electric vehicle according to the embodiment of the present disclosure, the above power battery pack is used to improve the entire performance of the electric vehicle and prevent occurrence of arcing, fire, and even explosion accidents, thereby fully ensuring the safety of passengers in the vehicle.
Other components such as a body and operations of the electric vehicle according to the embodiment of the present disclosure are known to those of ordinary skill in the art, and the details will not be described herein.
In the description of the present disclosure, it is to be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc. are the orientations or positional relationships shown in the drawings, are merely to facilitate describing the present disclosure and to simplify the description, are not intended to indicate or imply that the referenced device or element needs to have a particular orientation, be constructed and operated in a particular orientation, and therefore are not to be construed as limiting the present disclosure.
In addition, terms “first” and “second” are used merely for the purpose of description, and shall not be construed as indicating or implying relative importance or implying a quantity of indicated technical features. Therefore, features defining “first” and “second” may explicitly or implicitly include one or more such features. In the description of the present disclosure, the meaning of “plurality” is more than two unless specifically defined otherwise.
In the present disclosure, it should be noted that unless otherwise explicitly specified and limited, the terms “mount”, “connect”, “connection”, and “fix” should be understood in a broad sense. For example, a connection may be a fixed connection, a detachable connection, an integral connection; or the connection may be a mechanical connection or an electrical connection; or the connection may be a direct connection, an indirect connection through an intermediate medium, internal communication between two components, or an interaction relationship between two components.
The specific meanings of the above terms in the present disclosure may be understood according to specific circumstances for those ordinary skill in the art. In the present disclosure, unless expressly stated and defined otherwise, a first feature “on” or “beneath” a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intermediary. Moreover, the first feature “over”, “above” and “up” the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that a horizontal height of the first feature is higher than that of the second feature. The first feature “under”, “below” and “down” the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that a horizontal height of the first feature is less than that of the second feature.
In the description of the present specification, reference to the description of the terms “one embodiment”, “some embodiments”, “examples”, “specific examples”, or “some examples”, etc. means that specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, schematic representations of the above terms are not necessarily directed to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, different embodiments or examples described in the present specification, as well as features of different embodiments or examples, may be integrated and combined by those skilled in the art without contradicting each other.
While the embodiments of the present disclosure have been shown and described above, it is to be understood that the above-described embodiments are illustrative and not to be construed as limiting the present disclosure, and changes, modifications, substitutions, and variations of the above-described embodiments may occur to those of ordinary skill in the art within the scope of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201911367813.3 | Dec 2019 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2020/123304 | 10/23/2020 | WO |
