Patent Application
20240195029
This application claims priority to Chinese Patent Application No. 202121031942.8 filed with the China National Intellectual Property Administration (CNIPA) on May 14, 2021, the disclosure of which is incorporated herein by reference in its entirety.
The present application relates to the technical field of power batteries, and in particular, to a power battery cover and a power battery.
In the technical field of power batteries, the terminal is a component that connects the inside and outside of a battery in a power battery cover. One end of the terminal is connected to the external circuit of the power battery, and another end of the terminal is connected to the internal battery cell of the power battery. The negative current collector inside the battery cell is made of copper foil, so that the negative terminal of the power battery cover can ensure the use performance of the internal battery cell of the battery only by adopting pure copper material, thus achieving the charge and discharge functions of the battery.
The embodiments of the present application provide a power battery cover and a power battery to deal with the risk of poor sealing effect of the sealing ring and easy failure of the power battery in the copper-aluminum composite terminal.
In a first aspect, the present application provides a power battery cover, which includes a top cover, a copper-aluminum composite terminal, a seal, an upper plastic insulator, and a lower plastic insulator. The copper-aluminum composite terminal is disposed to pass through the top cover. The copper-aluminum composite terminal includes a copper base body part and an aluminum base body part connected to each other, where the copper base body part includes a first base body part and a first column body part, the aluminum base body part includes a second column body part and a third column body part, a diameter of the second column body part is equal to a diameter of the first column body part, and an end surface of the first column body part and an end surface of the second column body part are connected to form a composite connection surface. The seal is clamped between the copper-aluminum composite terminal and the top cover, and the seal seals and wraps the composite connection surface. The upper plastic insulator is disposed above the top cover, and the copper-aluminum composite terminal is disposed to pass through the upper plastic insulator. The lower plastic insulator is disposed below the top cover and clamped between the top cover and the copper-aluminum composite terminal.
In a second aspect, the embodiments of the present application provide a power battery, including the power battery cover described above.
In the drawings:
1, Copper-aluminum composite terminal; 11, Aluminum base body part; 112, Second column body part; 113, Third column body part; 12, Copper base body part; 120, First base body part; 121, First column body part; 2, Top cover; 3, Seal; 31, First sealing part; 32, Second sealing part; 33, Third sealing part; 4, Upper plastic insulator 5, Lower plastic insulator 6, Riveting block; 61, First step hole; 62, Second step hole; 63, Counter bore.
In the related art, pure copper material has the disadvantages of heavy weight and high material cost. In order to overcome this disadvantage, a copper-aluminum composite terminal can be provided, and pure aluminum material is used to connect the external circuit of the power battery to deal with the heavy weight and high material cost of the negative terminal of pure copper material.
In the assembling method of the copper-aluminum composite terminal in the related art, the connecting surface of the copper-aluminum composite terminal is usually located above or below the sealing ring. This setting method cannot play a good sealing effect. Once the electrolyte penetrates and contacts the aluminum material of the copper-aluminum composite terminal, it will affect the performance of the cells in the power battery and cause the power battery to fail.
Therefore, there is an urgent need to provide a power battery cover and a power battery, which can reduce the weight and cost of the battery while ensuring the performance of the battery.
The embodiments of the present application disclose a power battery cover and a power battery, and the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without requiring creative efforts shall all fall in the scope of protection of the present application.
In the description of the present application, it should be noted that orientations or position relations indicated by terms such as “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “in” and “out” are based on the drawings. These orientations or position relations are intended only to facilitate and simplify the description of the present application and not to indicate or imply that a device or element referred to must have such particular orientations or must be configured or operated in such particular orientations. Moreover, terms such as “first” and “second” are used only for the purpose of description and are not to be construed as indicating or implying relative importance. Terms such as “first position” and “second position” are two different positions, and moreover, a first feature being “on”, “above” and “over” a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is at a higher level than the second feature. The first feature being “under”, “below” and “beneath” the second feature includes the first feature being directly below and obliquely below the second feature, or simply represents that the first feature is at a lower level than the second feature.
In the description of the present application, terms “mounted”. “joined” and “connected” are to be understood in a broad sense unless otherwise expressly specified and limited. For example, the term “connected” may refer to “securely connected” or “detachably connected” or “integrally connected”, may refer to “mechanically connected” or “electrically connected” or may refer to “connected directly”, “connected indirectly through an intermediary” or “connected inside two components”. For those of ordinary skill in the art, specific meanings of the preceding terms in the present application may be understood based on specific situations.
The embodiments of the present application are described in detail below; examples of which are illustrated in the accompanying drawings, in which same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout.
As shown in
In an embodiment, the copper base body part 12 includes a first base body part 120 and a first column body part 121, the aluminum base body part 11 includes a second column body part 112 and a third column body part 113, and a diameter of the second column body part 112 is equal to a diameter of the first column body part 112. A composite connection surface is formed between the aluminum base body part 11 and the copper base body part 12, the seal 3 is clamped between the copper-aluminum composite terminal 1 and the top cover 2, and the seal 3 seals and wraps the composite connection surface. Through such arrangement, the composite connection surface of the copper-aluminum composite terminal 1 may be sealed by the seal 3, so that the electrolyte is avoided from being in contact with an aluminum material in the copper-aluminum composite terminal 1, the performance of the battery cell of the power battery is avoided from being influenced, and thus the use reliability of the copper-aluminum composite terminal 1 is improved.
In an embodiment, the aluminum base body part 11 and copper base body part 12 may be connected by processes such as a friction welding or a riveting, and of course, other connection manners may also be adopted.
In an embodiment, as shown in
In an embodiment, the first sealing part 31 is integrally formed with the second sealing part 32, and in this way, a machining process of the seal 3 can be simplified, and installation is facilitated.
In an embodiment, the seal 3 further includes a ring-shaped third sealing part 33. The ring-shaped third sealing part 33, when installed, due to the fluidity of the material, enables the seal 3 to discharge material to the surroundings when subjected to pressure until the required amount of compression is reached, whereby the sealing reliability of the seal 3 is improved.
In an embodiment, the power battery cover in the embodiment fixes the copper-aluminum composite terminal 1 in a stamping manner, an upper end surface of the third column body part 113 is selected as a stamping surface, as shown in
In an embodiment, the riveting block 6 is further provided with a counter bore 63, and the counter bore 63 is connected to and coaxially disposed with the first step hole 61 and the second step hole 62. Through such arrangement, a riveting punch is convenient to impact downwards a punching end of the copper-aluminum composite terminal 1, so that an end of the third column body part 113 is formed with a protruding part protruding outwards, and the protruding part is snapped within the first step hole 61, so that the copper-aluminum composite terminal 1 is fixed, and the movement of the copper-aluminum composite terminal 1 along the axial direction of the copper-aluminum composite terminal 1 is limited.
In an embodiment, the upper plastic insulator 4 is provided with an accommodation groove, and the riveting block 6 may be placed within the an accommodation groove, so that an overall thickness of the power battery cover may be reduced, a larger installation space is vacated for the battery cell of the power battery, and an energy density of the power battery is improved.
In an embodiment, a containing cavity is formed on a side of the top cover 2 away from the upper plastic insulator 4, and can contain the copper base body part 12, and through such arrangement, the overall thickness of the power battery cover is reduced, and thus the energy density of the power battery continues to be improved.
This embodiment further provides a power battery including the power battery cover described above. In the power battery cover, the copper base body part 12 of the copper-aluminum composite terminal 1 is connected to a negative current collector inside a battery cell of the power battery, and the aluminum base body part 11 of the copper-aluminum composite terminal 1 is connected to an external circuit of the power battery, whereby in a case where the use performance of the battery is ensured, the weight of the power battery is reduced, and the cost is reduced.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202121031942.8 | May 2021 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/118760 | 9/16/2021 | WO |
