Battery

Abstract

The present invention provides a battery, comprising a case, a battery cell, supports, and support members. The battery cell, the supports, and the support members are all located in the case; the battery cell comprises a battery cell body and tabs; the case has a first wall surface; each support comprises two support portions and a bottom plate connected between the two support portions; the bottom plate and the two support portions support the first wall surface from the same side; in a first direction, the two support portions are spaced apart and a tab accommodating cavity is formed between the two support portions; each tab extends from the battery cell body into the corresponding tab accommodating cavity; each support member is used for being mounted in the corresponding tab accommodating cavity; and in the first direction, the maximum length of each support member is L1, and the spacing between the two support portions is L2, wherein L1>L2, such that after the support member is mounted in the tab accommodating cavity, two sides of the support member respectively abut against the two support portions. The case of the battery has good deformation resistance.

Description

A type of battery

[0001] This application claims priority to Chinese Patent Application No. 202411525409.5, filed on October 30, 2024, entitled "A Battery", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery. Background Technology

[0003] Battery casings are prone to deformation due to factors such as cell weight, riveted terminals, electrolyte filling holes, and electrolyte injection. This deformation negatively impacts battery lifespan and safety, especially for batteries with thinner casings where deformation is more pronounced. Therefore, minimizing casing deformation is a technical problem that requires solutions from those skilled in the art. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this application provides a battery, which includes a casing, a cell, a bracket, and a support member. The cell, the bracket, and the support member are all located within the casing. The cell includes a cell body and a tab. The bracket is located on the side of the cell where the tab is located. The casing has a first wall surface. The bracket includes two branches. One end of each branch is fixed to the first wall surface, and the other end extends away from the first wall surface. In a first direction, the two branches are spaced apart and form a tab receiving cavity between them. The tab extends from the cell body into the tab receiving cavity. The support member is used to install in the tab receiving cavity. In the first direction, the maximum length of the support member is L1, and the distance between the two branches is L2, where L1 > L2, so that after the support member is installed in the tab receiving cavity, its two sides respectively press against the two branches.

[0005] In this application, since the maximum length L1 of the support member in the first direction is greater than the distance L2 between the first and second branches of the bracket, after the support member is installed in the tab receiving cavity between the two branches, the two sides will press against the two branches respectively, so that the two branches fixed to the first wall of the shell can more effectively support the first wall of the shell, thereby improving the deformation resistance of the shell and reducing the deformation of the shell caused by cell weight, riveted terminal assembly, opening of liquid injection hole, liquid injection, etc., thereby extending the service life of the battery and improving the safety of battery use. Attached Figure Description

[0006] Figure 1 is a perspective view of an embodiment of the battery provided in this application;

[0007] Figure 2 is a plan view of Figure 1;

[0008] Figure 3 is an exploded view of the casing and battery cell shown in Figure 1;

[0009] Figure 4 is a three-dimensional view of the location of one of the supports in Figure 1;

[0010] Figure 5 is an exploded view of a stent;

[0011] Figure 6 is a plan view of Figure 4;

[0012] Figure 7 is a plan view of the second support plate;

[0013] Figure 8 shows the plan view of the two branches and the base plate.

[0014] The reference numerals in the attached drawings are explained as follows: 1. Shell, 11. Shell body, 12. Cover plate, 1a. First wall surface, 1b. Second wall surface, A. Liquid injection hole, B. Terminal post riveting hole; 2. Cell, 21. Cell body, 22. Positive electrode tab, 23. Negative electrode tab; 3. Support, 31. Support part, 311. Base part, 312. Extension part, 32. Electrode tab receiving cavity, 33. Base plate, 34. Flexible connection part; 4. Support member, 41. First support plate, 42. Second support plate; 51. Positive electrode post, 52. Negative electrode post. Detailed Implementation

[0015] This application provides a battery. To enable those skilled in the art to better understand the technical solution of this application, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0016] As shown in Figures 1-4, the battery includes a casing 1, a cell 2, a bracket 3, a support 4, and terminals. The terminals include a positive terminal 51 and a negative terminal 52.

[0017] In the illustrated embodiment, the housing 1 includes a housing body 11 and a cover plate 12. One side of the housing body 11 has an opening in the thickness direction, and the cover plate 12 closes the opening of the housing body 11. The cover plate 12 and the housing body 11 together form a receiving cavity. In another embodiment, the housing body 11 has openings at both ends in the length direction, and two cover plates 12 respectively close the openings at both ends of the housing body 11. The two cover plates 12 and the housing body 11 together form a receiving cavity.

[0018] The battery cell 2 is located inside the casing 1. The battery cell 2 includes a cell body 21 and tabs extending from the cell body 21. The tabs include a positive tab 22 and a negative tab 23. In the illustrated embodiment, the positive tab 22 and the negative tab 23 extend from opposite sides of the cell body 21. The cell body 21 includes a positive electrode and a negative electrode, which are arranged alternately, with a separator between adjacent positive and negative electrodes. In some embodiments, the positive and negative electrodes are arranged alternately along the thickness direction of the battery, making the cell body 21 a stacked structure. In some embodiments, the positive and negative electrodes are wound, and are arranged alternately along a direction perpendicular to the winding center line, making the cell body 21 a wound structure. The positive and negative electrodes have similar structures, both including a current collector and active material layers coated on both sides of the current collector. In the positive electrode sheet, the uncoated portion of the current collector protrudes beyond the coated portion, forming a single positive electrode tab. Multiple positive electrode tabs are stacked to form a positive electrode tab 22. In the negative electrode sheet, the uncoated portion of the current collector protrudes beyond the coated portion, forming a single negative electrode tab. Multiple negative electrode tabs are stacked to form a single negative electrode tab 23.

[0019] The positive electrode tab 22 is welded to the positive electrode post 51 to achieve electrical connection, or the positive electrode tab 22 and the positive electrode post 51 are each welded to the positive electrode adapter to achieve electrical connection. The negative electrode tab 23 is welded to the negative electrode post 52 to achieve electrical connection, or the negative electrode tab 23 and the negative electrode post 52 are each welded to the negative electrode adapter to achieve electrical connection.

[0020] The bracket 3 is located inside the housing 1. The bracket 3 is located on the side of the battery cell 2 where the tabs are located. When the positive tab 22 and the negative tab 23 are led out from opposite sides of the battery cell body 21, a bracket 3 can be set on each side of the battery cell body 21. The bracket 3 located on the side of the battery cell 2 where the tabs are located can limit the battery cell 2 and prevent the end face of the battery cell 2 with the tabs (this end face is not covered with an insulating film) from accidentally contacting the housing 1 and causing a short circuit. At the same time, the bracket 3 also has a binding effect on the tabs and prevents the tabs from accidentally contacting the housing 1 and causing a short circuit.

[0021] As shown in Figure 4, the support 3 includes two branches 31, which are spaced apart in a first direction, forming a tab receiving cavity 32 between them. The tabs extend from the battery cell body 21 into the tab receiving cavity 32. The housing 1 has a first wall surface 1a. One end of each of the two branches 31 is fixed to the first wall surface 1a, and the other end extends away from the first wall surface 1a. Specifically, the two branches 31 can be directly fixed to the first wall surface 1a, or they can be fixed to a plate, which is fixed to the first wall surface 1a by a pole. In the illustrated embodiment, the housing 1 is generally rectangular, and has two large-area walls and four small-area walls. The two large-area walls are parallel and spaced apart in a second direction, which is perpendicular to the first direction. The four small-area walls are connected between the edges of the two large-area walls. The first wall surface 1a is one of the large-area walls. In the illustrated embodiment, the cover plate 12 is constructed to form a large-area wall surface, which is the first wall surface 1a, and the side wall of the shell body 11 away from the cover plate 12 is constructed to form another large-area wall surface, which is the second wall surface 1b.

[0022] The support member 4 is used to install within the tab receiving cavity 32. As shown in Figure 7, the maximum length of the support member 4 in the first direction is L1. As shown in Figure 8, when the support member 4 is not assembled within the tab receiving cavity 32, the distance between the two supports 31 is L2. L1 > L2, so that after the support member 4 is installed within the tab receiving cavity 32, the two sides of the support member 4 press against the two supports 31 respectively, causing the two supports 31 to be subjected to a pushing force from the support member 4 that moves away from each other. When this force is transmitted to the first wall surface 1a, the position of the first wall surface 1a corresponding to the two supports 31 is subjected to a pushing force away from the cell 2. This causes the first wall surface 1a located between the two supports 31 to have a bending tendency closer to the cell, thereby offsetting some of the casing deformation caused by the weight of the cell 2, thus extending the battery's lifespan and improving the battery's safety.

[0023] In some embodiments, a liquid injection hole A is provided on the first wall surface 1a, and the liquid injection hole A at least partially coincides with the orthographic projection of the support 3 on the first wall surface 1a. This design allows the support 3 to effectively support the liquid injection hole A during liquid injection, preventing deformation of the shell during the liquid injection process.

[0024] In some embodiments, the pole post riveting hole B at least partially coincides with the orthographic projection of the bracket 3 on the first wall surface 1a, which is more conducive to reducing the deformation of the first wall surface 1a during the riveting process of the pole post.

[0025] In some embodiments, 1 < L1 / L2 ≤ 1.05. The preferred range of L1 is 30.5mm ≤ L1 ≤ 205mm, and the specific value of L1 can be 30.5mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, or 205mm. In this embodiment, L1 is preferably 71.1mm. The preferred range of L2 is 30mm ≤ L2 ≤ 200mm, and the specific value of L2 can be 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 180mm, 190mm, or 200mm. In this embodiment, L2 is preferably 70.6mm.

[0026] By controlling L1 / L2 within the aforementioned range, the support member 4 can generate sufficient supporting force on the support 31, thereby ensuring that the support 31 provides sufficient support to the first wall surface 1a and preventing deformation of the housing 1. If L1 / L2 is too small, the support member 4 cannot generate sufficient supporting force on the support 31, thus failing to prevent deformation of the housing. When L1 / L2 is too large, it indicates that the length of the support member 4 is too large. After being inserted between the two supports 31, it will cause excessive deformation of the support 31, resulting in a reduction in the internal space of the housing 1 and thus reducing the energy density of the single battery cell.

[0027] In some embodiments, in the first direction, the length of the cell 2 is L (see Figure 4), and the length of the support 3 is L3 (see Figure 4), with 0.9 ≤ L3 / L ≤ 1. If L3 / L is too small, the two sides of the first wall 1a in the first direction will not receive reliable support from the two supports 31, resulting in insufficient support force in the shell area corresponding to the two supports, which is not conducive to improving the deformation resistance of the first wall 1a. If L3 / L is too large, the support 4 and the support 3 will occupy more of the internal space of the shell 1, resulting in a reduction in the arrangement space of the cell 2 and a low battery capacity density. Due to the limitation of the shell, when the length of the support 3 in the first direction is too long, the length of the support 4 is limited, and the ratio of L1 / L2 is too small, resulting in insufficient support force and poor deformation resistance of the first wall. 0.9 ≤ L3 / L ≤ 1 can balance the battery capacity density and the deformation resistance of the shell 1. When 0.9 ≤ L3 / L ≤ 1, the range of L1 / L2 can be configured as: 1 ≤ L1 / L2 ≤ 1.02. When L1 / L2 is within this range, the support member 4 can not only provide support for the support 31, but also ensure that the deformation of the support 31 does not interfere with the shell. Specifically, the range of L can be: 80 ≤ L ≤ 120 mm; for example, L can be equal to 80 mm, 90 mm, 100 mm, 110 mm, or 120 mm. In this embodiment, 98 mm is preferred. The range of L3 can be: 79 mm ≤ L3 ≤ 119 mm; for example, L3 can be equal to 79 mm, 89 mm, 99 mm, 109 mm, or 119 mm. In this embodiment, L3 is preferably 96.5 mm.

[0028] In some embodiments, the ratio of the weight (in kg) of the battery cell 2 to the thickness (in mm) of the first wall surface 1a is C, where 4 kg / mm ​​≤ C ≤ 6 kg / mm. It should be noted that the weight of the battery cell 2 is the weight of the cell before it is soaked in electrolyte, or the weight of the cell after disassembly and vacuum drying at 80°C for 72 hours. When the value of C is within this range, it means that the battery weight per unit thickness of the first wall surface 1a is within a reasonable range, and the first wall surface 1a can provide greater support for the battery cell with less deformation. Therefore, L1 / L2 can be controlled within a small range, for example: 1 ≤ L1 / L2 ≤ 1.02. At this time, the two supports 31 on the first wall surface 1a generate a certain supporting force under the action of the support member 4, causing partial deformation of the first wall surface 1a to enhance the deformation of the first wall surface 1a caused by the weight of the battery cell or the impact generated when the battery cell shakes. This reduces the deformation of the first wall surface 1a of the casing and improves the safety of the battery. For example, in this embodiment, the weight of the battery cell can be 1.793 kg, and the thickness of the first wall 1a is 0.3 mm.

[0029] In some embodiments, the ratio of the weight (in kg) of the battery cell 2 to the thickness (in mm) of the first wall 1a is C, where 6 kg / mm ​​≤ C ≤ 10 kg / mm. When the value of C is within this range, it means that the battery weight per unit thickness of the first wall 1a is relatively heavy, the supporting force of the first wall 1a on the battery cell is limited, and the deformation is relatively large. Therefore, L1 / L2 can be controlled within a relatively large range, for example: 1.02 ≤ L1 / L2 ≤ 1.05. When L1 / L2 is within this range, the supporting force of the support member 4 on the branch 31 is relatively large, and the deformation of the first wall 1a corresponding to the two branches 31 is relatively large under the action of the branch 31, which can offset most of the deformation of the first wall 1a caused by the weight of the battery cell.

[0030] In some embodiments, in the second direction, the height of the support 31 is proportional to the distance between the first wall surface 1a and the second wall surface 1b corresponding to the support 31, which is D, where 0.7 ≤ D ≤ 1. When the value of D is within this range, it means that the height of the support 31 accounts for a relatively large proportion. In this case, if the first wall surface 1a deforms slightly, the side of the support 31 away from the first wall surface 1a will come into contact with the second wall surface 1b. At this time, the second wall surface 1b can indirectly support the first wall surface 1a through the support 31, so that the first wall surface 1a will not continue to deform. Therefore, L1 / L2 can be controlled within a small range, for example: 1 ≤ L1 / L2 ≤ 1.015. In the illustrated embodiment, the two ends of the second wall surface 1b are recessed towards the first wall surface 1a to form a recessed area, and the middle of the second wall surface 1b protrudes away from the first wall surface 1a to form a protruding area. The bracket 3 is located between the recessed area and the first wall surface 1a, and the distance between the first wall surface 1a and the second wall surface 1b corresponding to the bracket 3 is the distance between the recessed area of ​​the first wall surface 1a and the second wall surface 1b.

[0031] In some embodiments, the wall thickness of the housing 1 is H, where 0.2mm ≤ H ≤ 0.4mm, for example, H can be equal to 0.3mm. When the value of H is within this range, it means that the wall thickness of the housing is relatively thin. In this case, the housing 1 is more prone to deformation. Therefore, L1 / L2 can be controlled within a larger range, for example: 1.005 ≤ L1 / L2 ≤ 1.035.

[0032] In the illustrated embodiment, the support 31 includes a base portion 311 and an extension portion 312. One side of the base portion 311 is supported on the first wall surface 1a. The extension portion 312 extends from the end of the base portion 311 away from the first wall surface 1a in a direction away from the first wall surface 1a. The support member 4 includes a first support plate 41 and a second support plate 42. The first support plate 41 is installed between the two base portions 311. The tab in the tab receiving cavity 32 is located between the first support plate 41 and the first wall surface 1a. At least a portion of the second support plate 42 extends from the first support plate 41 in a direction away from the first wall surface 1a. The second support plate 42 is located between the two extension portions 312. In the illustrated embodiment, the extension portion 312 extends from the end face of the base portion 311 away from the first wall surface 1a, near the area close to the cell body 21, in a direction away from the first wall surface 1a, so that the extension portion 312 can contact the end face of the cell body 21 from which the tab is led out, thereby preventing damage to the cell body 21. In the illustrated embodiment, the second support plate 42 is located on the side of the first support plate 41 that is close to the cell body 21.

[0033] Furthermore, the maximum length of the support member 4 is located on the side of the second support plate 42 away from the first wall surface 1a. After the support member 4 is assembled in the tab receiving cavity 32, the maximum length of the support member 4 presses against the two extensions 312. This makes the lever arm of the pressing point relative to the support 31 relatively large. A small pressing force can make the support 31 have a large deflection tendency. The greater the deflection tendency of the support 31, the better the support effect on the first wall surface 1a. In this way, a small pressing force can make the support 31 provide a good support effect on the first wall surface 1a. Moreover, the small pressing force generates less stress on the support 31.

[0034] In the illustrated embodiment, the base portion 311 is provided with a buckle X on the side near the electrode ear receiving cavity 32, and the first support plate 41 is provided with a snap-fit ​​portion Y. The first support plate 41 and the base portion 311 are snapped together by the snap-fit ​​portion Y and the buckle X.

[0035] In some embodiments, the length of the second support plate 42 in the first direction gradually decreases as it approaches the first wall surface 1a, so that the second support plate 42 can be easily assembled between the two extensions 312 and the extensions 312 are less likely to be damaged during the assembly process.

[0036] In some embodiments, the aforementioned extension 312 and second support plate 42 are not provided, and the maximum length of the support member 4 is located at the first support plate 41. After the support member 4 is assembled in the tab receiving cavity 32, the first support plate 41 presses against the two base portions 311.

[0037] In some embodiments, at least a portion of the second support plate 42 extends from the first support plate 41 toward the first wall surface 1a, such that a portion of the second support plate 42 is located on the side of the first support plate 41 near the first wall surface 1a. This can limit the electrode tab and prevent it from being torn off.

[0038] In some embodiments, the bracket 3 further includes a base plate 33 located between the two supports 31. The base plate 33 has through holes through which at least part of the pole post passes and the base plate 33 is fixed to the first wall surface 1a. The base plate 33 can serve to insulate the pole post from the housing 1.

[0039] In some embodiments, the support 3 further includes a flexible connecting portion 34, which connects the first support plate 41 and the base plate 33. The first support plate 41 can be flipped relative to the support 3 by means of the flexible deformation of the flexible connecting portion 34. Before connecting the tabs and poles, the first support plate 41 is flipped outside the two base portions 311; after the tabs and poles are connected, the first support plate 41 is flipped between the two base portions 311.

[0040] In some embodiments, the support member 4 and the bracket 3 are an integral structure, specifically, they can be integrally injection molded. The integral injection molded structure has better overall integrity and lower molding cost. In the illustrated embodiment, one side of the first support plate 41 of the support member 4 is an integral structure with the flexible connection part 34 of the bracket 3. When the first support plate 41 is flipped between the two supports 31, it engages with the two supports 31.

[0041] In some embodiments, the support member 4 and the bracket 3 are separate structures, and the support member 4 and the bracket 3 are assembled and fixed. The assembly method is not limited, for example, it can be assembled with threaded fasteners, snap-fit ​​assembly, adhesive assembly, or thermoforming assembly.

[0042] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A battery, characterized in that, The battery includes a casing (1), a cell (2), a bracket (3), and a support member (4). The cell (2), the bracket (3), and the support member (4) are all located inside the casing (1). The cell (2) includes a cell body (21) and a tab. The bracket (3) is located on the side of the cell (2) where the tab is located. The casing (1) has a first wall surface (1a). The bracket (3) includes two supports (31). One end of each support (31) is fixed to the first wall surface (1a), and the other end extends away from the first wall surface (1a). Extending in the direction of the first direction, the two branches (31) are spaced apart and form a tab receiving cavity (32) between them. The tab extends from the battery cell body (21) into the tab receiving cavity (32). The support member (4) is used to install in the tab receiving cavity (32). In the first direction, the maximum length of the support member (4) is L1, and the distance between the two branches (31) is L2, where L1 > L2, so that after the support member (4) is installed in the tab receiving cavity (32), its two sides abut against the two branches (31) respectively.

2. The battery according to claim 1, characterized in that, 30.5mm≤L1≤205mm, 30mm≤L2≤200mm.

3. The battery according to any one of claims 1-2, characterized in that, 1 < L1 / L2 ≤ 1.

05.

4. The battery according to any one of claims 1-2, characterized in that, In the first direction, the length of the battery cell (2) is L, the length of the bracket (3) is L3, 0.9≤L3 / L≤1, 1≤L1 / L2≤1.02, and 80≤L≤120mm.

5. The battery according to any one of claims 1-2 or 4, characterized in that, The ratio of the weight of the battery cell (2) to the thickness of the first wall surface (1a) is C, where 4 kg / mm ​​≤ C ≤ 6 kg / mm, and 1 ≤ L1 / L2 ≤ 1.

02.

6. The battery according to any one of claims 1-3, characterized in that, The ratio of the weight of the battery cell (2) to the thickness of the first wall surface (1a) is C, 6kg / mm≤C≤10kg / mm, 1.02≤L1 / L2≤1.

05.

7. The battery according to any one of claims 1-2, 4 or 5, characterized in that, The housing (1) also has a second wall (1b), the first wall (1a) and the second wall (1b) are parallel to each other, the first wall (1a) and the second wall (1b) are arranged alternately in a second direction, the second direction is perpendicular to the first direction, in the second direction, the height of the support (31) is D to the distance between the first wall (1a) and the second wall (1b) corresponding to the support (31), 0.7≤D≤1, 1≤L1 / L2≤1.

015.

8. The battery according to any one of claims 1-3, characterized in that, The wall thickness of the shell is H, 0.2mm≤H≤0.4mm, 1.005≤L1 / L2≤1.

035.

9. The battery according to any one of claims 1-8, characterized in that, The support (31) includes a base portion (311), one side of which is supported on the first wall surface (1a). The support member (4) includes a first support plate (41), which is located between the two base portions (311). The electrode in the electrode receiving cavity (32) is located between the first support plate (41) and the first wall surface (1a).

10. The battery according to claim 9, characterized in that, The support (31) includes an extension (312) that extends from the base (311) in a direction away from the first wall (1a). The support (4) includes a second support plate (42) that extends from the first support plate (41) in a direction away from the first wall (1a). The second support plate (42) is located between the two extensions (312).

11. The battery according to claim 10, characterized in that, A portion of the second support plate (42) extends from the first support plate (41) toward the first wall surface (1a).

12. The battery according to any one of claims 1-8, characterized in that, The bracket (3) and the support member (4) are an integral structure; or the bracket (3) and the support member (4) are separate structures and connected to each other.

13. The battery according to any one of claims 1-12, characterized in that, The electrode tabs include a positive electrode tab (22) and a negative electrode tab (23), which are led out from opposite sides of the battery cell body (21).

14. The battery according to any one of claims 1-13, characterized in that, The first wall surface (1a) is provided with a liquid injection hole (A), and the liquid injection hole (A) at least partially coincides with the orthographic projection of the bracket (3) on the first wall surface (1a).

Images