Side plate assembly and battery cell

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a side plate assembly and a battery cell, the side plate assembly comprises a side plate body, a plurality of through holes are arranged on the side plate body along a first direction, and the plurality of through holes are arranged on the side plate body along a second direction and / or a third direction at intervals to form an exhaust structure of the side plate body; and the side plate disassembly piece is detachably connected with the side plate body and is suitable for blocking the through hole. According to the side plate assembly provided by the utility model, the through holes in the side plate body are selectively blocked through one or more side plate disassembly pieces, so that the positions and the distribution proportion of the exhaust through holes in the side plate body can be flexibly and quickly adjusted according to actual requirements, the distribution of air passages in a battery cell is improved, and the safety of the battery cell is improved; meanwhile, the whole battery cell development period can be shortened, and the battery cell development requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a side plate component and a battery core. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are becoming increasingly higher.

[0003] The lithium battery side panel is the core component to ensure the safety of battery thermal runaway, and its structural design is crucial to the safety of the battery cell. Existing lithium battery side panels usually use 0.2mm to 0.3mm die-cut parts, which can only produce battery cells with low airway requirements. On the one hand, since the thickness of the side panel is a fixed design value, it cannot be adjusted later. If you want to adjust the height of the support surface, you need to re-open the mold; on the other hand, the position and proportion of the exhaust holes on the side panel are constant and cannot be adjusted. Therefore, the position and distribution ratio of the exhaust holes on the existing lithium battery side panels cannot be flexibly and quickly adjusted according to actual needs, and cannot meet the development needs of battery cells. Utility Model Content

[0004] In view of this, the utility model provides a side panel assembly and a battery cell to solve the problem that the position and distribution ratio of the exhaust holes of the existing lithium battery side panel cannot be flexibly and quickly adjusted according to actual needs and cannot meet the development needs of the battery cell.

[0005] In a first aspect, the utility model provides a side panel assembly, comprising:

[0006] A side plate body, wherein a plurality of through holes are opened on the side plate body along a first direction, and the plurality of through holes are arranged at intervals on the side plate body along a second direction and / or a third direction to form an exhaust structure of the side plate body;

[0007] The side panel disassembly part is disassembled and connected with the side panel body, and the side panel disassembly part is suitable for blocking the through hole;

[0008] One or more side panel disassembly parts are suitable for selectively blocking the through holes on the side panel body so as to flexibly and quickly adjust the exhaust structure.

[0009] The side panel assembly provided by the utility model forms an exhaust structure of the side panel body by opening a through hole on the side panel body, thereby forming an internal air passage of the battery cell in the shell, and the internal air passage of the battery cell is suitable for transmitting the gas generated during thermal runaway to the explosion-proof valve, so that the explosion-proof valve can be normally detonated to ensure the safety of the battery cell; each side panel disassembly is connected to the side panel body to block the through hole; the through hole on the side panel body is selectively blocked by one or more side panel disassembly parts, so that the position and distribution ratio of the exhaust through hole of the side panel body can be flexibly and quickly adjusted according to actual needs, thereby improving the distribution of the internal air passage of the battery cell and improving the safety of the battery cell, and at the same time can save the entire battery cell development cycle and meet the development needs of the battery cell.

[0010] In an optional embodiment, the melting point of the side panel component is T, and T satisfies T>t, wherein t is the melting point of the side panel body.

[0011] With such an arrangement, when thermal runaway occurs in the battery cell, even if the side panel body is melted by heat, resulting in the side panel body losing its supporting function and being unable to ensure smooth exhaust passage, the side panel disassembled parts can still provide support, ensuring that there is always a gap and an exhaust passage between the pole group and the inner wall of the shell, thereby ensuring normal exhaust of the battery cell in the event of thermal runaway.

[0012] In an optional embodiment, the side panel disassembly component includes a sealing portion and a clamping portion; the sealing portion is suitable for fitting with one side of the side panel body along the first direction to seal the through hole; the clamping portion is suitable for passing through the through hole and clamping with a side of the side panel body along the first direction away from the sealing portion to make the sealing portion fit with the side panel body.

[0013] Through such an arrangement, it is possible to achieve the disassembly connection between the side panel disassembly and the side panel body, and to achieve the blocking of the through holes by the blocking part, so that the position and distribution ratio of the exhaust through holes of the side panel body can be flexibly and quickly adjusted according to actual needs, thereby improving the airway distribution inside the battery cell.

[0014] In an optional embodiment, the side panel body includes a side panel main wall and a protrusion; the side panel main wall is suitable for opening a through hole to form an exhaust structure; the protrusion is formed by protruding along a first direction from one side of the side panel main wall, and the protrusion is suitable for supporting the side panel main wall.

[0015] By such an arrangement, one end of the protrusion away from the main wall of the side plate along the first direction abuts against the inner wall of the shell, which can not only prevent the pole group from shifting along the first direction in the shell, but also enable an exhaust gap to be formed between the main wall of the side plate and the inner wall of the shell along the first direction, thereby providing sufficient airway space inside the battery cell and improving the safety of the battery cell.

[0016] In an optional embodiment, the thickness of the blocking portion along the first direction is H, and H satisfies H+e≤2·E, wherein e is the thickness of the main wall of the side plate along the first direction, and E is the total thickness of the side plate body along the first direction.

[0017] By such an arrangement, the energy density of the battery cell is guaranteed while providing sufficient airway space inside the battery cell.

[0018] In an optional implementation, when H≥E-e, the blocking portion supports the side plate main wall along the first direction away from the side plate main wall.

[0019] By such an arrangement, the side of the sealing portion away from the main wall of the side panel along the first direction is in contact with the inner wall of the shell to support the main wall of the side panel; on the one hand, the through hole is blocked by the sealing portion, so that the position and distribution ratio of the exhaust through holes of the side panel body can be flexibly and quickly adjusted according to actual needs, thereby improving the airway distribution inside the battery cell; on the other hand, the main wall of the side panel is supported by the sealing portion, so that an exhaust gap is formed between the main wall of the side panel and the inner wall of the shell, thereby providing sufficient airway space for the inside of the battery cell and improving the safety of the battery cell; on the other hand, since the melting point of the side panel disassembled part is higher than the melting point of the side panel body, the main wall of the side panel is supported by the sealing portion. When thermal runaway occurs in the battery cell, even if the side panel body is melted by heat, the side panel disassembled part can still provide support, thereby ensuring that there is always a gap and an exhaust channel between the pole group and the inner wall of the shell, thereby ensuring that the battery cell is normally exhausted in case of thermal runaway.

[0020] In an optional implementation, when 0<H<E-e, the protrusion supports the main wall of the side plate.

[0021] Through such an arrangement, when the battery cell is in normal working condition, the protrusion can support the main wall of the side panel. At this time, on the one hand, an exhaust gap can be formed between the main wall of the side panel and the inner wall of the shell, thereby ensuring sufficient airway space inside the battery cell and improving the safety of the battery cell. On the other hand, it is beneficial to reduce the total thickness of the side panel assembly along the first direction, thereby improving the energy density of the battery cell.

[0022] In an optional implementation, the thickness H of the blocking portion along the first direction also satisfies H≥0.4·E.

[0023] Through such an arrangement, since the sealing portion has a certain thickness along the first direction, when thermal runaway occurs in the battery cell, even if the side plate body is melted by heat, the sealing portion can jointly support the pole group and the inner wall of the shell in the first direction with the clamping portion, ensuring that there is always a gap and an exhaust channel between the pole group and the inner wall of the shell, thereby ensuring that the battery cell is normally exhausted in the event of thermal runaway.

[0024] In an optional embodiment, the snap-on portion includes a first snap, a second snap and a reinforcing rib, the first snap and the second snap are arranged relative to each other along the second direction, the reinforcing rib is arranged between the first snap and the second snap, and the reinforcing rib is suitable for limiting the first snap and the second snap.

[0025] Through such a configuration, not only the overall structural strength of the snap-in part can be enhanced, but also the first snap and the second snap can be limited by the reinforcing ribs. When the snap-in part passes through the through hole, the first snap and the second snap are simultaneously snapped with the side of the side panel body away from the blocking part along the first direction. At this time, the two ends of the reinforcing rib respectively press against the first snap and the second snap along the second direction to ensure the interference fit between the snap-in part and the through hole, which is beneficial to enhancing the firmness of the fit between the blocking part and the side panel body.

[0026] In a second aspect, the utility model further provides a battery cell, comprising: a battery cell body, and the side panel assembly as described above.

[0027] The battery cell provided by the utility model can flexibly and quickly adjust the distribution position and distribution ratio of the exhaust holes of the side panel body according to actual needs by adjusting the distribution position and distribution quantity of the side panel disassembly parts on the side panel body, thereby improving the internal airway distribution of the battery cell and improving the safety of the battery cell. At the same time, it can save the entire battery cell development cycle and meet the development needs of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the working principle of a side panel assembly according to an embodiment of the utility model;

[0030] Figure 2 for Figure 1 A local enlarged schematic diagram of the middle A;

[0031] Figure 3 for Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0032] Figure 4 It is a three-dimensional structural schematic diagram of a side panel disassembled part of a side panel assembly according to an embodiment of the utility model;

[0033] Figure 5 It is a three-dimensional structural schematic diagram of a side panel body and a side panel disassembled part of a side panel assembly according to an embodiment of the utility model;

[0034] Figure 6 for Figure 5 A partial enlarged schematic diagram of point C in the middle;

[0035] Figure 7 It is a schematic diagram of a top view of the structure of a side panel body and a side panel disassembled part of a side panel assembly according to an embodiment of the utility model;

[0036] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure of the DD section;

[0037] Description of reference numerals:

[0038] 10. side panel body; 101. through hole; 11. side panel main wall; 12. protrusion;

[0039] 20. Side panel disassembly; 21. Blocking portion; 22. Snap-on portion; 221. First snap buckle; 222. Second snap buckle; 223. Reinforcement rib;

[0040] 30. Shell;

[0041] 40. Pole group;

[0042] 50. Explosion-proof valve;

[0043] 60. Cover plate. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0045] Combine the following Figures 1 to 8 , describing an embodiment of the utility model.

[0046] According to an embodiment of the present utility model, on the one hand, a side panel assembly is provided, comprising:

[0047] A side plate body 10, wherein a plurality of through holes 101 are provided on the side plate body 10 along a first direction, and the plurality of through holes 101 are arranged at intervals along a second direction and / or a third direction on the side plate body 10 to form an exhaust structure of the side plate body 10;

[0048] The side panel disassembly part 20 is detachably connected to the side panel body 10, and the side panel disassembly part 20 is suitable for blocking the through hole 101;

[0049] One or more side panel disassembly parts 20 are suitable for selectively blocking the through holes 101 on the side panel body 10 so as to flexibly and quickly adjust the exhaust structure.

[0050] Please note that, see Figure 1 As shown, the side plate body 10 is suitable for being attached to the side of the pole group 40 close to the explosion-proof valve 50 along the first direction, and then inserted into the housing 30 together with the pole group 40 along the third direction; please combine Figure 2 and Figure 3 As shown, a plurality of through holes 101 are opened on the side panel body 10 along the first direction, and the plurality of through holes 101 are spaced apart on the side panel body 10 along the second direction and / or the third direction to form an exhaust structure of the side panel body 10, thereby forming an internal air passage of the battery cell in the shell 30, and the internal air passage of the battery cell is suitable for transmitting the gas generated during thermal runaway to the explosion-proof valve 50, so that the explosion-proof valve 50 can be normally detonated to ensure the safety of the battery cell; each side panel disassembly 20 is detachably connected to the side panel body 10 to block the through hole 101; the through hole 101 on the side panel body 10 is selectively blocked by one or more side panel disassembly parts 20, so that the position and distribution ratio of the exhaust through holes of the side panel body 10 can be flexibly and quickly adjusted according to actual needs, thereby improving the internal air passage distribution of the battery cell and improving the safety of the battery cell, while saving the entire battery cell development cycle and meeting the development needs of the battery cell.

[0051] Furthermore, the side panel body 10 adopts an injection molding process and is flexibly and quickly combined with the side panel disassembled parts 20 to form a variety of exhaust channel combination structures, which can not only adapt to the processing requirements of battery cells with more complex structures, but also help to ensure the strength of the exhaust channel structure inside the battery cells.

[0052] In one embodiment, the melting point of the side panel assembly 20 is T, T satisfies T>t, where t is the melting point of the side panel body 10; Figure 1-Figure 3 As shown, since the melting point of the side panel disassembled part 20 is higher than the melting point of the side panel body 10, when the battery cell has thermal runaway, even if the side panel body 10 is melted by heat, resulting in the side panel body 10 losing its supporting function and unable to ensure smooth exhaust passage, the side panel disassembled part 20 can still provide support, ensuring that there is always a gap and an exhaust passage between the pole group 40 and the inner wall of the shell 30, thereby ensuring normal exhaust of the battery cell in the event of thermal runaway.

[0053] In one embodiment, see Figure 4 As shown, the side panel disassembly part 20 includes a blocking part 21 and a clamping part 22; Figure 7 and Figure 8 As shown, the blocking portion 21 is attached to one side of the side plate body 10 along the first direction, thereby blocking the through hole 101; Figure 5 and Figure 6As shown, the clamping portion 22 passes through the through hole 101 and is clamped with the side of the side panel body 10 away from the blocking portion 21 along the first direction, so that the blocking portion 21 fits with the side panel body 10; the side panel disassembly 20 can realize the disassembly connection between the side panel disassembly 20 and the side panel body 10 and the blocking of the through hole 101 by setting the blocking portion 21 and the clamping portion 22, so that the position and distribution ratio of the exhaust through holes of the side panel body 10 can be flexibly and quickly adjusted according to actual needs, thereby improving the airway distribution inside the battery cell.

[0054] In one embodiment, please combine Figure 5 , Figure 7 and Figure 8 As shown, the side plate body 10 includes a side plate main wall 11 and a protrusion 12; the side plate main wall 11 is suitable for opening a through hole 101 to form an exhaust structure of the side plate body 10; please combine Figure 3 As shown, the protrusion 12 is arranged on a side of the side plate main wall 11 away from the pole group 40 along the first direction. The protrusion 12 is formed by the side plate main wall 11 protruding along the first direction away from the pole group 40. One end of the protrusion 12 away from the side plate main wall 11 along the first direction is suitable for abutting against the inner wall of the shell 30, which can not only prevent the pole group 40 from being offset along the first direction in the shell 30, but also enable an exhaust gap to be formed between the side plate main wall 11 and the inner wall of the shell 30 along the first direction, thereby providing sufficient airway space inside the battery cell and improving the safety of the battery cell.

[0055] In one embodiment, see Figure 8 As shown, the thickness of the blocking portion 21 along the first direction is H, and H satisfies H+e≤2·E, wherein e is the thickness of the side panel main wall 11 along the first direction, and E is the total thickness of the side panel body 10 along the first direction, and the total thickness of the side panel body 10 along the first direction is equal to the sum of the thickness of the side panel main wall 11 along the first direction and the thickness of the protrusion 12 along the first direction.

[0056] It should be noted that since the internal space of the shell 30 is limited, the greater the total thickness of the side panel body 10 along the first direction, the smaller the remaining accommodating space for the electrode group 40, resulting in a lower energy density of the battery cell; in this embodiment, the thickness H of the sealing portion 21 along the first direction satisfies H+e≤2·E, wherein e is the thickness of the side panel main wall 11 along the first direction, and E is the total thickness of the side panel body 10 along the first direction, thereby ensuring the energy density of the battery cell under the premise of providing sufficient airway space inside the battery cell.

[0057] In one embodiment, please combine Figure 1 , Figure 3 and Figure 8As shown, when H≥E-e, that is, when the blocking portion 21 is higher than the protrusion 12 along the first direction, the side of the blocking portion 21 away from the side plate main wall 11 along the first direction abuts against the inner wall of the shell 30 to support the side plate main wall 11; on the one hand, the through hole 101 is blocked by the blocking portion 21, so that the position and distribution ratio of the exhaust through hole of the side plate body 10 can be flexibly and quickly adjusted according to actual needs, and the airway distribution inside the battery core is improved; on the other hand, the side plate main wall 11 is supported by the blocking portion 21, so that the side plate An exhaust gap is formed between the main wall 11 and the inner wall of the shell 30, thereby providing sufficient air duct space inside the battery cell and improving the safety of the battery cell; on the other hand, since the melting point of the side panel disassembly 20 is higher than the melting point of the side panel body 10, the side panel main wall 11 is supported by the sealing portion 21. When thermal runaway occurs in the battery cell, even if the side panel body 10 is melted by heat, the side panel disassembly 20 can still provide support, ensuring that there is always a gap and an exhaust channel between the pole group 40 and the inner wall of the shell 30, ensuring that the battery cell is normally exhausted in the event of thermal runaway.

[0058] In one embodiment, please combine Figure 1 , Figure 3 and Figure 8 As shown, when 0<H<E-e, that is, when the sealing portion 21 is lower than the protrusion 12 along the first direction, under the normal working state of the battery cell, the protrusion 12 supports the main wall 11 of the side panel. At this time, on the one hand, an exhaust gap can be formed between the main wall 11 of the side panel and the inner wall of the shell 30, thereby ensuring sufficient airway space inside the battery cell and improving the safety of the battery cell. On the other hand, it is beneficial to reduce the total thickness of the side panel assembly along the first direction, thereby improving the energy density of the battery cell.

[0059] In one embodiment, the thickness H of the sealing portion 21 along the first direction also satisfies H≥0.4·E. Since the sealing portion 21 has a certain thickness along the first direction, when thermal runaway occurs in the battery cell, even if the side plate body 10 is melted by heat, the sealing portion 21 can jointly support the inner wall of the pole group 40 and the shell 30 with the clamping portion 22 in the first direction, ensuring that there is always a gap and an exhaust channel between the pole group 40 and the inner wall of the shell 30, thereby ensuring that the battery cell is normally exhausted in the event of thermal runaway.

[0060] In one embodiment, see Figure 8As shown, the clamping portion 22 includes a first clamping portion 221, a second clamping portion 222 and a reinforcing rib 223, and the first clamping portion 221 and the second clamping portion 222 are arranged relative to each other in the second direction; by arranging the reinforcing rib 223 between the first clamping portion 221 and the second clamping portion 222, not only the overall structural strength of the clamping portion 22 can be enhanced, but also the first clamping portion 221 and the second clamping portion 222 can be limited by the reinforcing rib 223. When the clamping portion 22 passes through the through hole 101, the first clamping portion 221 and the second clamping portion 222 are simultaneously clamped with the side of the side plate body 10 away from the blocking portion 21 in the first direction. At this time, the two ends of the reinforcing rib 223 respectively push against the first clamping portion 221 and the second clamping portion 222 in the second direction to ensure the interference fit between the clamping portion 22 and the through hole 101, which is beneficial to enhance the firmness of the sealing portion 21 and the side plate body 10.

[0061] According to an embodiment of the present invention, on the other hand, a battery cell is provided, comprising: a battery cell body, and the side plate assembly as described above.

[0062] See also Figure 1 As shown, the battery cell provided in this embodiment mainly includes a shell 30, a pole group 40, an explosion-proof valve 50 and a cover plate 60 and the side panel assembly as mentioned above, and the side panel assembly includes a side panel body 10 and a side panel disassembly 20, and the side panel disassembly 20 is detachably connected to the side panel body 10. By adjusting the distribution position and distribution quantity of the side panel disassembly 20 on the side panel body 10, the distribution position and distribution ratio of the exhaust holes of the side panel body 10 can be flexibly and quickly adjusted according to actual needs, thereby improving the internal airway distribution of the battery cell and improving the safety of the battery cell. At the same time, it can save the entire battery cell development cycle and meet the development needs of the battery cell.

[0063] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A side panel assembly, characterized in that: include: A side plate body, wherein a plurality of through holes are opened on the side plate body along a first direction, and the plurality of through holes are arranged at intervals on the side plate body along a second direction and / or a third direction to form an exhaust structure of the side plate body; A side panel disassembly part, which is detachably connected to the side panel body, and the side panel disassembly part is suitable for blocking the through hole; One or more of the side panel disassembly parts are suitable for selectively blocking the through holes on the side panel body so as to flexibly and quickly adjust the exhaust structure.

2. The side panel assembly according to claim 1, characterized in that: The melting point of the side panel component is T, and T satisfies T>t, wherein t is the melting point of the side panel body.

3. The side panel assembly according to claim 1, characterized in that: The side panel disassembly component includes a sealing portion and a clamping portion; the sealing portion is suitable for being fitted with one side of the side panel body along the first direction to seal the through hole; the clamping portion is suitable for passing through the through hole and being clamped with a side of the side panel body along the first direction away from the sealing portion to make the sealing portion fit with the side panel body.

4. The side panel assembly according to claim 3, characterized in that: The side panel body comprises a side panel main wall and a protrusion; the side panel main wall is suitable for providing the through hole to form the exhaust structure; the protrusion is formed by protruding along a first direction from one side of the side panel main wall, and the protrusion is suitable for supporting the side panel main wall.

5. The side panel assembly according to claim 4, characterized in that: The thickness of the blocking portion along the first direction is H, and H satisfies H+e≤2·E, wherein e is the thickness of the main wall of the side plate along the first direction, and E is the total thickness of the side plate body along the first direction.

6. The side panel assembly according to claim 5, characterized in that: When H≥E-e, the blocking portion supports the side plate main wall along the first direction away from the side plate main wall.

7. The side panel assembly according to claim 5, characterized in that: When 0<H<E-e, the protrusion supports the main wall of the side plate.

8. The side panel assembly according to claim 7, characterized in that: The thickness H of the blocking portion along the first direction also satisfies H≥0.4·E.

9. The side panel assembly according to any one of claims 3 to 8, characterized in that: The clamping portion includes a first clamp, a second clamp and a reinforcing rib, the first clamp and the second clamp are arranged relatively spaced along the second direction, the reinforcing rib is arranged between the first clamp and the second clamp, and the reinforcing rib is suitable for limiting the first clamp and the second clamp.

10. A battery cell, characterized in that: include: A battery cell body, and a side plate assembly as described in any one of claims 1 to 9.

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