Battery, battery pack, and vehicle

Abstract

This application provides a battery, a battery pack, and a vehicle. The battery includes a housing, a first cover plate assembly and a second cover plate assembly respectively fixed to both ends of the housing, and a battery cell disposed within the housing. The battery is provided with an injection port and an explosion-proof valve; the battery cell includes a body, a first tab, and a second tab. The first tab is disposed at the end of the body facing the first cover plate assembly and connected to the first cover plate assembly, and the second tab is disposed at the end of the body facing the second cover plate assembly and connected to the second cover plate assembly. In the direction from one end of the housing to the other, the length of the first tab is greater than that of the second tab. The injection port is disposed on the second cover plate assembly, and the explosion-proof valve is disposed on the housing. By disposing of the injection port on the second cover plate assembly and the explosion-proof valve on the housing, the first cover plate assembly can obtain a larger space, the volume of the first tab can be increased, the current-carrying area is increased, and the resistance is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery, a battery pack, and a vehicle. Background Technology

[0002] With the gradual development of vehicle technology, new energy vehicles are becoming increasingly popular. As the power supply component of new energy vehicles, batteries face higher requirements for performance and safety. A battery consists of a cell, a casing, and a pair of cover plates. Each cell has tabs at both ends. During battery assembly, after one tab is welded to one of the cover plates, the end of the cell with the welded cover plate is first installed into the casing. To ensure that the other tab of the cell can connect properly to the cover plate, the tab at the end that is inserted into the casing later is longer, preventing it from being unable to protrude from the casing.

[0003] Currently, the battery has a liquid injection hole and an explosion-proof valve on the cover plates at both ends. However, due to the different lengths of the tabs at both ends, the tab at the longer end has a larger resistance, resulting in uneven heating at both ends of the cell and reducing the cell's overcurrent capacity. Utility Model Content

[0004] This application provides a battery, a battery pack, and a vehicle to solve related technical problems.

[0005] This application provides a battery, including a housing, a first cover plate assembly and a second cover plate assembly respectively fixed to both ends of the housing, and a battery cell disposed within the housing; the battery is provided with an injection port and an explosion-proof valve; the battery cell includes a main body, a first electrode, and a second electrode; the first electrode is disposed at the end of the main body facing the first cover plate assembly and connected to the first cover plate assembly, and the second electrode is disposed at the end of the main body facing the second cover plate assembly and connected to the second cover plate assembly; in the direction from one end to the other end of the housing, the length of the first electrode is greater than that of the second electrode; the injection port is disposed at the second cover plate assembly, and the explosion-proof valve is disposed at the housing.

[0006] By placing the liquid injection hole in the second cover plate assembly and placing the explosion-proof valve in the housing, the first cover plate assembly can obtain a larger space, the volume of the first tab can be increased, the current-carrying area can be increased, the resistance can be reduced, the heat generation of the first tab and the second tab can be more balanced, the current-carrying capacity of the cell can be improved, the working performance of the battery can be improved, and the safety can be enhanced.

[0007] Furthermore, the first electrode tab includes a first base connected to the main body, an extension formed by bending from the first base, and a first connecting portion formed by bending from the extension. The bending direction of the extension is opposite to that of the first connecting portion, and the first connecting portion is connected to the first cover plate assembly. By forming the first electrode tab through two bends, the length is increased, ensuring that the first electrode tab can be properly installed into the first cover plate assembly, while also improving the flexibility of the first electrode tab and reducing the risk of breakage.

[0008] Furthermore, the first cover assembly includes a first cover plate and a first fixing member. The first fixing member connects the first cover plate and the housing to its two sides, respectively. The first electrode tab passes through the first fixing member and connects to the first cover plate. By providing the first fixing member, the first electrode tab and the first cover plate are supported, thereby improving the structural strength of the battery.

[0009] Furthermore, a gap exists between the first base and the extension, and the first fixing member is provided with a support portion that extends into the gap and abuts against the extension. By providing the support portion, the supporting effect of the first fixing member on the first electrode tab is strengthened, further improving the structural strength of the battery.

[0010] Furthermore, the second electrode tab includes a second base connected to the main body and a second connecting portion formed by bending from the second base, the second connecting portion being connected to the second cover plate assembly. The bending of the second electrode tab improves its flexibility and reduces the risk of breakage.

[0011] Furthermore, the first tab includes a first positive tab and a first negative tab; the second tab includes a second positive tab and a second negative tab. With tabs of different polarities at both ends of the cell, some current can be transmitted between the tabs at the same end without needing to cross the cell to reach the tab at the other end. This shortens the current path during charging and discharging, reduces temperature rise during operation, and improves battery performance.

[0012] Furthermore, the first cover plate assembly is provided with a first positive electrode space and a first negative electrode space, and a first partition is provided between the first positive electrode space and the first negative electrode space. The first positive electrode tab extends from the main body into the first positive electrode space, and the first negative electrode tab extends from the main body into the first negative electrode space.

[0013] And / or, the second cover assembly is provided with a second positive electrode space and a second negative electrode space, and a second partition is provided between the second positive electrode space and the second negative electrode space. The second positive electrode tab extends from the main body into the second positive electrode space, and the second negative electrode tab extends from the main body into the second negative electrode space. By providing the partition, the electrodes of different polarities are separated, short circuits are avoided, and battery safety is improved.

[0014] Furthermore, the first electrode tab has a first protrusion on the side opposite to the main body, and the first protrusion abuts and is fixed to the first cover plate assembly; and / or, the second electrode tab has a second protrusion on the side opposite to the main body, and the second protrusion abuts and is fixed to the second cover plate assembly. By providing the protrusion, the connection strength between the electrode tab and the second cover plate assembly is strengthened, and the current flow effect is improved.

[0015] A second aspect of this application provides a battery pack including the aforementioned battery. Because the battery of this application has high safety, the battery pack of this application has high stability.

[0016] A third aspect of this application provides a vehicle including the aforementioned battery pack. Because the battery pack of this application has high stability, the vehicle of this application has high reliability.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this specification and, together with the description, serve to explain the principles of this specification.

[0019] Figure 1 This is a structural diagram of a battery according to an exemplary embodiment of this application;

[0020] Figure 2 yes Figure 1 3D exploded view of the battery;

[0021] Figure 3 yes Figure 1 Cross-sectional view of the middle battery at point AA;

[0022] Figure 4 yes Figure 2 A schematic diagram of the structure of the battery cell;

[0023] Figure 5 yes Figure 3 A magnified view of a section at point B in the middle;

[0024] Figure 6 yes Figure 3 A magnified view of a section at point C.

[0025] Reference numerals: 10; 20; 20; 201; 202; 21; 22; 221; 23; 24; 30; 301; 302; 31; 32; 321; 33; 40; 41; 42; 4201; 4202; 420; 421; 422; 423; 424; 43; 43; 43; 43; 43; 43; 4301; 4302; 430; 431; 432; 432; 50; 60. Detailed Implementation

[0026] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0027] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0028] Due to assembly requirements, the tabs at both ends of the battery cell are of different lengths. The tab installed first into the casing is shorter, which reduces resistance. The tab installed later into the casing is longer, ensuring that it can extend out of the casing and connect to the cover plate. Because of the different lengths and resistances of the tabs at both ends, the heat generation at both ends of the battery cell is uneven during charging and discharging, reducing the cell's overcurrent capacity. This application provides a battery to solve these related technical problems.

[0029] like Figure 1 and Figure 2 As shown, a first aspect of this application provides a battery, including a housing 10, a first cover plate assembly 20 and a second cover plate assembly 30 respectively fixed to both ends of the housing 10, and a battery cell 40 disposed within the housing 10. The battery is provided with an injection hole 50 and an explosion-proof valve 60.

[0030] Please refer to the following: Figure 3As shown, the battery cell 40 includes a main body 41, a first tab 42, and a second tab 43. The first tab 42 is disposed at the end of the main body 41 facing the first cover plate assembly 20. The second tab 43 is disposed at the end of the main body 41 facing the second cover plate assembly 30. The first tab 42 is connected to the first cover plate assembly 20. The second tab 43 is connected to the second cover plate assembly 30.

[0031] In the direction from one end of the housing 10 to the other, the length of the first electrode 42 is greater than that of the second electrode 43. The liquid injection hole 50 is provided on the second cover plate assembly 30, and the explosion-proof valve 60 is provided on the housing 10.

[0032] By placing the injection hole 50 on the second cover plate assembly 30 and placing the explosion-proof valve 60 on the housing 10, the first cover plate assembly 20 can obtain a larger space, the volume of the first tab 42 can be increased, the current-carrying area can be increased, the resistance can be reduced, and the heat generation of the first tab 42 and the second tab 43 can be more balanced, thereby improving the current-carrying capacity of the cell 40, improving the working performance of the battery, and enhancing safety.

[0033] The first cover plate assembly 20 includes a first cover plate 21 and a first fixing member 22. The first fixing member 22 connects the first cover plate 21 and the housing 10 on both sides, respectively. The first electrode tab 42 passes through the first fixing member 22 and connects to the first cover plate 21. By setting the first fixing member 22, the first electrode tab 42 and the first cover plate 21 are supported, thereby improving the structural strength of the battery.

[0034] The first cover plate assembly 20 is provided with a first positive electrode space 201 and a first negative electrode space 202 to accommodate electrode tabs. A first partition 221 is provided between the first positive electrode space 201 and the first negative electrode space 202 to separate the electrode tabs. The first partition 221 is located in the middle of the first fixing member 22.

[0035] The first fixing member 22 is provided with a support part 23 to support the first electrode tab 42, further improving the support strength of the first electrode tab 42. The first cover plate 21 is provided with a first pole post 24, which is electrically connected to the first electrode tab 42.

[0036] The second cover assembly 30 includes a second cover 31 and a second fixing member 32. The second cover 31 is provided with a second terminal post 33, which is electrically connected to a second terminal tab 43. The second fixing member 32 connects the second cover 31 and the housing 10 on both sides, respectively. The second terminal tab 43 passes through the second fixing member 32 and connects to the second cover. By providing the second fixing member 32, the second terminal tab 43 and the second cover 31 are supported, thereby improving the structural strength of the battery.

[0037] The second cover plate assembly 30 is provided with a second positive electrode space 301 and a second negative electrode space 302 to accommodate electrode tabs. A second partition 321 is provided between the second positive electrode space 301 and the second negative electrode space 302 to separate the electrode tabs. The second partition 321 is located in the middle of the second fixing member 32.

[0038] Please refer to the following: Figure 4 As shown, the first tab 42 includes a first positive tab 4201 and a first negative tab 4202. The second tab 43 includes a second positive tab 4301 and a second negative tab 4302. Since the battery cell 40 has tabs of different polarities at both ends, some current can be transmitted between the tabs at the same end without needing to cross the cell to reach the tab at the other end. This shortens the current path during charging and discharging, reduces the temperature rise during operation, and improves battery performance.

[0039] The first positive electrode tab 4201 extends from the main body 41 into the first positive electrode space 201. The first negative electrode tab 4202 extends from the main body 41 into the first negative electrode space 202. The second positive electrode tab 4301 extends from the main body 41 into the second positive electrode space 301, and the second negative electrode tab 4302 extends from the main body 41 into the second negative electrode space 302.

[0040] The first positive tab 4201 and the first negative tab 4202 are isolated by the first separator 221, and the second positive tab 4301 and the second negative tab 4302 are isolated by the second separator 321. By setting the separator to separate the tabs of different polarities, short circuits are avoided and the safety of the battery is improved.

[0041] Please refer to the following: Figure 5 As shown, a first protrusion 420 is provided on the side of the first electrode 42 facing away from the main body 41. The first protrusion 420 abuts and is fixed to the first cover plate assembly 20. By providing the first protrusion 420, the connection strength between the first electrode 42 and the second cover plate assembly 30 is improved, thus improving the current flow effect.

[0042] The first electrode tab 42 includes a first base 421, an extension 422, and a first connecting portion 423. The extension 422 and the first connecting portion 423 have opposite bending directions. The first connecting portion 423 is connected to the first cover plate assembly 20. The first connecting portion 423 is electrically connected to the first electrode post 24.

[0043] By bending twice to form the first tab 42, the length is increased and the first tab 42 can be properly installed into the first cover plate assembly 20. At the same time, it can effectively absorb the stress caused by volume expansion or external vibration during the charging and discharging process of the battery cell, improve the flexibility of the first tab 42, and reduce the risk of breakage.

[0044] A gap 424 exists between the first base 421 and the extension 422. The support 23 extends into the gap 424 and abuts against the extension 422. By setting the support 23 to abut against the extension 422, the supporting effect of the first fixing member 22 on the first electrode tab 42 is strengthened, further improving the structural strength of the battery.

[0045] Please refer to the following: Figure 6 As shown, the second tab 43 includes a second base 431 and a second connecting portion 432. The second connecting portion 432 is connected to the second cover plate assembly 30. The second connecting portion 432 is electrically connected to the second pole post 33. The second tab 43 is formed by bending, which improves the flexibility of the second tab 43 and can effectively absorb the stress caused by volume expansion or external vibration during the charging and discharging process of the battery cell, reducing the risk of breakage.

[0046] A second protrusion 430 is provided on the side of the second electrode 43 opposite to the main body 41. The second protrusion 430 abuts and is fixed to the second cover plate assembly 30. By providing the first protrusion 420, the connection strength between the second electrode 43 and the second cover plate assembly 30 is improved, and the current flow effect is improved.

[0047] A second aspect of this application provides a battery pack including the aforementioned battery. Because the battery of this application has high safety, the battery pack of this application has high stability.

[0048] A third aspect of this application provides a vehicle including the aforementioned battery pack. Because the battery pack of this application has high stability, the vehicle of this application has high reliability.

[0049] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery, characterized in that, include: The battery comprises a housing, a first cover plate assembly and a second cover plate assembly respectively fixed to both ends of the housing, and a battery cell disposed inside the housing; the battery is provided with an injection hole and an explosion-proof valve; The battery cell includes a main body, a first electrode, and a second electrode; the first electrode is disposed at one end of the main body facing the first cover plate assembly and connected to the first cover plate assembly, and the second electrode is disposed at one end of the main body facing the second cover plate assembly and connected to the second cover plate assembly; In the direction from one end of the housing to the other, the length of the first electrode tab is greater than that of the second electrode tab; the liquid injection hole is disposed in the second cover plate assembly, and the explosion-proof valve is disposed in the housing.

2. The battery according to claim 1, characterized in that, The first tab includes a first base connected to the body, an extension formed by bending from the first base, and a first connecting portion formed by bending from the extension. The bending direction of the extension is opposite to that of the first connecting portion, and the first connecting portion is connected to the first cover plate assembly.

3. The battery according to claim 2, characterized in that, The first cover plate assembly includes a first cover plate and a first fixing member. The first fixing member is connected to the first cover plate and the housing on both sides, and the first electrode tab passes through the first fixing member and is connected to the first cover plate.

4. The battery according to claim 3, characterized in that, There is a gap between the first base and the extension, and the first fastener is provided with a support portion that extends into the gap and abuts against the extension.

5. The battery according to claim 1, characterized in that, The second electrode includes a second base connected to the body and a second connecting portion formed by bending from the second base, the second connecting portion being connected to the second cover plate assembly.

6. The battery according to claim 1, characterized in that, The first electrode includes a first positive electrode and a first negative electrode; the second electrode includes a second positive electrode and a second negative electrode.

7. The battery according to claim 6, characterized in that, The first cover plate assembly is provided with a first positive electrode space and a first negative electrode space, and a first partition is provided between the first positive electrode space and the first negative electrode space. The first positive electrode tab extends from the main body into the first positive electrode space, and the first negative electrode tab extends from the main body into the first negative electrode space. And / or, the second cover plate assembly is provided with a second positive electrode space and a second negative electrode space, a second partition is provided between the second positive electrode space and the second negative electrode space, the second positive electrode tab extends from the main body into the second positive electrode space, and the second negative electrode tab extends from the main body into the second negative electrode space.

8. The battery according to claim 1, characterized in that, The first electrode ear has a first protrusion on the side opposite to the main body, and the first protrusion abuts and is fixed to the first cover plate assembly; and / or, the second electrode ear has a second protrusion on the side opposite to the main body, and the second protrusion abuts and is fixed to the second cover plate assembly.

9. A battery pack, characterized in that, include: The battery as described in any one of claims 1-8.

10. A vehicle, characterized in that, include: The battery pack as described in claim 9.

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