Battery pole group fixing structure and battery
By using split end plates and plastic under-split plastic to prevent the pole group from squirting when the battery is thermally out of control, the problem of exhaust gas and heat dissipation is solved, which improves safety performance and reduces production costs.
Patent Information
- Application Number
- CN202420017671.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-02
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-01-02
AI Technical Summary
When the battery cell causes heat out of control, the existing lithium-ion battery structure easily moves and blocks the explosion-proof valve, affecting the exhaust gas and heat dissipation of the battery and reducing safety performance.
By providing a split end plate and a split under-plastic plastic along one side of the explosion-proof valve, the high-temperature resistant material prevents the pole group from squirting, forming an exhaust space to ensure pressure relief and heat dissipation of the battery when the heat is out of control.
It effectively prevents the pole group from squirting, ensures that the battery can relieve pressure and heat in time when the heat is out of control, improves the battery's safety performance and saves production costs.
Smart Images
Figure CN222191073U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery pole group fixing structure and a battery. Background Art
[0002] Lithium-ion batteries have been widely used in energy storage systems such as hydropower, thermal power, wind power, as well as in power, aerospace and other fields due to their high energy density, low self-discharge, no memory effect, wide operating range, fast charge and discharge, long service life and no environmental pollution.
[0003] The existing lithium-ion battery structure usually includes components such as a cover plate, a shell, an end plate, a side plate, a bare cell insulating sheet, an electrode group and an electrolyte, among which the cover plate is integrated with a pole, an explosion-proof valve and a liquid injection hole, etc.; the side plate, the bare cell insulating sheet, the end plate and the lower plastic constitute the insulating protection structure of the electrode group, so as to prevent the electrode group from overlapping with the shell or the cover plate and causing short circuits and other problems during normal use of the battery cell; the cover plate and the shell are fixed by welding to form a closed space with a certain mechanical strength to protect the electrode group; the main function of the explosion-proof valve integrated on the cover plate is: when the battery cell is short-circuited and out of control due to external damage, improper use, etc., the high-temperature and high-pressure gas inside the battery cell is discharged in a timely and directional manner to prevent the battery cell from exploding at will, thereby avoiding unpredictable personal safety threats and property losses to users.
[0004] However, in the existing lithium-ion battery structure, when the battery cell triggers thermal runaway, after the end plate and the lower plastic are melted, the electrode group is likely to move toward the explosion-proof valve and block the explosion-proof valve, affecting the exhaust and heat dissipation of the battery and reducing the safety performance of the battery. Utility Model Content
[0005] In view of this, the utility model provides a battery pole group fixing structure and a battery to solve the problem that after the end plate and the lower plastic of the existing lithium-ion battery structure are melted, the pole group is easy to move toward the explosion-proof valve and block the explosion-proof valve, affecting the exhaust and heat dissipation of the battery.
[0006] In a first aspect, the utility model provides a battery electrode group fixing structure, comprising:
[0007] The housing has an inner peripheral wall enclosing a receiving cavity, and the receiving cavity is suitable for receiving the pole group;
[0008] A cover plate, which is arranged on one side of the housing along the first direction, and an explosion-proof valve is arranged on the cover plate, and the explosion-proof valve is spaced apart from the electrode group along the first direction;
[0009] The end plate body is arranged on one side of the pole group facing the cover plate along the first direction;
[0010] The split end plate is made of high temperature resistant material. The split end plate and the end plate body are independently arranged. The split end plate is arranged on the side of the end plate body close to the explosion-proof valve along the second direction. The split end plate is suitable for preventing the pole group from moving toward the explosion-proof valve along the first direction when the battery cell triggers thermal runaway.
[0011] The battery pole group fixing structure provided by the utility model is provided with a split end plate on one side of the end plate body along the second direction close to the explosion-proof valve, and the split end plate is provided between the pole group and the cover plate, and the split end plate can withstand the high temperature in the battery cell during thermal runaway; when thermal runaway occurs in the battery cell, after the internal plastic structures such as the end plate body in the battery cell quickly melt and fail, one side of the split end plate along the first direction can abut against the pole group, and the other side can abut against the cover plate, thereby preventing the pole group from moving toward the explosion-proof valve along the first direction, avoiding the pole group from blocking the explosion-proof valve, and further ensuring that the battery can release pressure and dissipate heat in time during thermal runaway, thereby improving the safety performance of the battery.
[0012] In an optional embodiment, the total length of the split end plate along the second direction is L, and L satisfies 40%·A≤L≤2·A, wherein A is the total width of the accommodating cavity along the third direction.
[0013] Through such a configuration, on the one hand, the electrode group can be stably and effectively supported when the battery cell triggers thermal runaway, and on the other hand, the electrode group can be effectively positioned during the battery cell manufacturing process to avoid damage to the electrode group. On the other hand, the production cost can be saved while effectively supporting and positioning the electrode group.
[0014] In an optional embodiment, the split end plate is provided as a single piece along the third direction, and the width of the split end plate along the third direction is M, where M satisfies 50%·A≤M≤85%·A.
[0015] Such an arrangement can not only avoid damage to the electrode group due to instability of the split end plate during the battery cell manufacturing process, but also provide stable and effective support to the electrode group when the battery cell triggers thermal runaway. At the same time, it can avoid interference during the battery cell manufacturing process and facilitate assembly.
[0016] In an optional embodiment, a plurality of split end plates are arranged side by side along the third direction, and the width of each split end plate along the third direction is M, where M satisfies 30%·A≤M<85%·A.
[0017] Such an arrangement can not only avoid damage to the electrode group due to instability of the split end plate during the battery cell manufacturing process, but also provide stable and effective support to the electrode group when the battery cell triggers thermal runaway. At the same time, it can avoid interference during the battery cell manufacturing process and facilitate assembly.
[0018] In an optional embodiment, the split end plate is detachably connected to the end plate body.
[0019] Such an arrangement is helpful to reduce the difficulty of production and processing of the split end plate and the end plate body, and at the same time facilitates the split end plate and the end plate body to be inserted into the shell together.
[0020] In an optional embodiment, the battery pole group fixing structure further includes:
[0021] The lower plastic body is arranged on one side of the cover plate along the first direction toward the electrode group;
[0022] The split lower plastic is made of high temperature resistant material. The split lower plastic and the lower plastic body are independently arranged. The split lower plastic is arranged on one side of the lower plastic body close to the explosion-proof valve along the second direction. The split lower plastic is suitable for preventing the pole group from moving toward the explosion-proof valve along the first direction when the battery cell triggers thermal runaway.
[0023] Through such an arrangement, when thermal runaway occurs in the battery cell, after the internal plastic structures such as the lower plastic body and the end plate body in the battery cell quickly melt and fail, the split lower plastic can prevent the pole group from moving toward the explosion-proof valve along the first direction, thereby avoiding the pole group from blocking the explosion-proof valve, thereby ensuring that the battery can release pressure and dissipate heat in time when thermal runaway occurs, thereby improving the safety performance of the battery.
[0024] In an optional implementation, one side of the split lower plastic along the first direction abuts against the cover plate, and the other side abuts against the split end plate.
[0025] Through such an arrangement, when thermal runaway occurs in the battery cell, after the internal plastic structures such as the lower plastic body and the end plate body in the battery cell quickly melt and fail, the side of the split lower plastic along the first direction toward the cover plate can abut against the cover plate, and the side of the split end plate along the first direction toward the pole group can abut against the pole group. At the same time, the split lower plastic abuts against the split end plate, so that when thermal runaway occurs in the battery cell, sufficient exhaust space is formed between the pole group and the cover plate along the first direction, which is beneficial to further improve the pressure relief efficiency and heat dissipation efficiency of the battery during thermal runaway, and improve the safety performance of the battery.
[0026] In an optional embodiment, a first exhaust channel is opened on the split end plate, and a second exhaust channel is opened on the split lower plastic. The first exhaust channel and the second exhaust channel are suitable for guiding the gas generated in the accommodating cavity during thermal runaway to the explosion-proof valve.
[0027] Through such an arrangement, when thermal runaway occurs in the battery cell, the first exhaust channel and the second exhaust channel can guide the gas generated in the accommodating cavity during thermal runaway to the explosion-proof valve, thereby ensuring that the battery can release pressure and dissipate heat in time during thermal runaway, thereby improving the safety performance of the battery.
[0028] In an optional embodiment, the split end plate and the split lower plastic are both made of insulating, high temperature and electrolyte resistant materials.
[0029] Through such a setting, the electrode group can be well protected during the battery cell manufacturing process and normal use to avoid abnormal overlap and short circuit inside the battery cell, and the electrode group can be stably and effectively supported when the battery cell triggers thermal runaway.
[0030] In a second aspect, the utility model further provides a battery, comprising: a battery body, and the battery pole group fixing structure as described above.
[0031] The battery of the second aspect includes the battery pole group fixing structure of the first aspect, and thus the battery of the second aspect includes all the beneficial effects of the battery pole group fixing structure of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] 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.
[0033] Figure 1 This is a schematic diagram of an exploded structure of a battery pole group fixing structure according to an embodiment of the utility model;
[0034] Figure 2 for Figure 1 A side structural schematic diagram of the shell in FIG.
[0035] Figure 3 A schematic diagram of the three-dimensional structure of a single split end plate and an end plate body of a battery pole group fixing structure according to an embodiment of the utility model;
[0036] Figure 4 It is a three-dimensional structural schematic diagram of a plurality of split end plates and an end plate body of a battery pole group fixing structure according to an embodiment of the utility model;
[0037] Figure 5 A schematic diagram of a connection between a split end plate and an end plate body of a battery pole group fixing structure according to an embodiment of the utility model;
[0038] Figure 6 It is another connection schematic diagram of a split end plate and an end plate body of a battery pole group fixing structure according to an embodiment of the utility model;
[0039] Figure 7 It is a schematic diagram of an exploded structure of another battery pole group fixing structure according to an embodiment of the utility model;
[0040] Figure 8 for Figure 7 Schematic diagram of the three-dimensional structure of the lower plastic main body and the split lower plastic.
[0041] Description of reference numerals:
[0042] 10. housing; 101. accommodating chamber;
[0043] 20. Pole group;
[0044] 30. Cover plate; 31. Explosion-proof valve;
[0045] 40. end plate body; 41. split end plate; 411. first exhaust channel; 42. fixing strip; 43. adhesive tape;
[0046] 50. lower plastic body; 51. split lower plastic; 511. second exhaust passage. DETAILED DESCRIPTION
[0047] 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.
[0048] In the related technology, the electrode group insulation protection structure inside the battery cell is made of plastic materials such as PP, which can well protect the electrode group during the battery cell manufacturing process and normal use to avoid abnormal connection and short circuit inside the battery cell. However, when the battery cell has thermal runaway, the internal temperature can reach above 600°C in a short period of time, and the internal plastic materials such as the side panels, bare battery cell insulation sheets, end panels, and lower plastic will quickly melt and fail. At this time, there is only the electrode group inside the shell. Under the action of the internal high-temperature and high-pressure gas, the electrode group loses balance. Because the pressure at the explosion-proof valve of the positive cover is relatively low, the electrode group can easily move toward the explosion-proof valve, thereby blocking the explosion-proof valve, causing the battery to fail to release pressure in time and catch fire and explode.
[0049] Combine the following Figures 1 to 8 , describing an embodiment of the utility model.
[0050] According to an embodiment of the present utility model, on the one hand, a battery pole group fixing structure is provided, comprising:
[0051] The housing 10 has an inner peripheral wall enclosing a receiving cavity 101, and the receiving cavity 101 is suitable for receiving the pole group 20;
[0052] A cover plate 30 is disposed on one side of the housing 10 along the first direction. An explosion-proof valve 31 is disposed on the cover plate 30. The explosion-proof valve 31 is spaced apart from the electrode group 20 along the first direction.
[0053] The end plate body 40 is disposed on one side of the pole group 20 facing the cover plate 30 along the first direction;
[0054] The split end plate 41 is made of high temperature resistant material. The split end plate 41 and the end plate body 40 are independently arranged. The split end plate 41 is arranged on one side of the end plate body 40 close to the explosion-proof valve 31 along the second direction. The split end plate 41 is suitable for preventing the pole group 20 from moving toward the explosion-proof valve 31 along the first direction when the battery cell triggers thermal runaway.
[0055] The battery pole group fixing structure provided in the present embodiment is provided with a split end plate 41 on one side of the end plate body 40 close to the explosion-proof valve 31 along the second direction, and the split end plate 41 is provided between the pole group 20 and the cover plate 30. The split end plate 41 can withstand the high temperature in the battery cell during thermal runaway. When thermal runaway occurs in the battery cell, after the internal plastic structure such as the end plate body 40 in the battery cell rapidly melts and fails, one side of the split end plate 41 along the first direction can abut against the pole group 20, and the other side can abut against the cover plate 30, thereby preventing the pole group 20 from moving toward the explosion-proof valve 31 along the first direction, avoiding the pole group 20 from blocking the explosion-proof valve 31, thereby ensuring that the battery can release pressure and dissipate heat in time during thermal runaway, thereby improving the safety performance of the battery.
[0056] It should be noted that the end plate body 40 can be made of plastic materials such as PP, which can well protect the electrode group during the battery cell manufacturing process and normal use to avoid abnormal overlap and short circuit inside the battery cell, and the split end plate 41 is made of high-temperature resistant materials such as hard ceramic silicone rubber and ceramic. When the battery cell triggers thermal runaway, the electrode group 20 can be prevented from moving toward the explosion-proof valve 31 along the first direction only through the split end plate 41, which is beneficial to saving costs while improving the safety performance of the battery; of course, the end plate body 40 and the split end plate 41 can also both be made of high-temperature resistant materials such as hard ceramic silicone rubber and ceramic. When the battery cell triggers thermal runaway, the end plate body 40 will not melt due to high temperature, and the end plate body 40 and the split end plate 41 can jointly prevent the electrode group 20 from moving toward the explosion-proof valve 31.
[0057] In some embodiments, on the one hand, when the battery cell triggers thermal runaway, the end plate body 40 and the internal plastic material structures such as the side plates, bare battery cell insulation sheet and lower plastic will quickly melt and fail, and only the split end plate 41 will effectively support the electrode group 20 and the cover plate 30. If the total length of the split end plate 41 along the second direction is too small, it will not be able to stably support the electrode group 20; on the other hand, if the total length of the split end plate 41 along the second direction is too small, it will be difficult to effectively position the electrode group 20 during the battery cell manufacturing process, and the electrode group 20 may be easily damaged due to unstable support. Therefore, the total length L of the split end plate 41 along the second direction must satisfy L≥40%·A, where A is the total width of the accommodating cavity 101 along the third direction. The total length L of the split end plate 41 along the second direction also satisfies L≤2·A, thereby effectively supporting and positioning the electrode group 20 while saving production costs, which is conducive to achieving a balance between product performance and production costs. Please refer to Figure 3 As shown, the total length L of the split end plate 41 along the second direction satisfies 40%·A≤L≤2·A, wherein, as Figure 2 As shown, A is the total width of the accommodating cavity 101 along the third direction. On the one hand, it can stably and effectively support the electrode group 20 when the battery cell triggers thermal runaway. On the other hand, it can effectively position the electrode group 20 during the battery cell manufacturing process to avoid damage to the electrode group 20. On the other hand, it can effectively support and position the electrode group 20 while saving production costs.
[0058] In some embodiments, see Figure 3 As shown, the split end plate 41 can be arranged as a single piece along the third direction, and the width of the split end plate 41 along the third direction cannot be too small, otherwise it is not only easy to cause the split end plate 41 to become unstable during the battery cell manufacturing process due to the small abutment area between the split end plate 41 and the electrode group 20, resulting in damage to the electrode group 20, but also it is easy to be difficult to stably and effectively support the electrode group 20 when the battery cell triggers thermal runaway. Therefore, the width M of the split end plate 41 along the third direction needs to satisfy M≥50%·A; the width of the split end plate 41 along the third direction cannot be too large, otherwise it is easy to interfere with the shell 10 during the battery cell manufacturing process, and it is difficult to assemble. Therefore, the width M of the split end plate 41 along the third direction needs to satisfy M≤85%·A. In the present embodiment, the width M of the split end plate 41 along the third direction satisfies 50%·A≤M≤85%·A, which can not only avoid damage to the electrode group 20 due to instability of the split end plate 41 during the battery cell manufacturing process, but also can stably and effectively support the electrode group 20 when the battery cell triggers thermal runaway, and at the same time can avoid interference with the shell 10 during the battery cell manufacturing process, thereby facilitating assembly.
[0059] In some embodiments, see Figure 4As shown, multiple split end plates 41 can be arranged side by side along the third direction, wherein the width of each split end plate 41 along the third direction cannot be too small, otherwise it is not only easy to cause the split end plate 41 to become unstable during the battery cell manufacturing process due to the small abutment area between the split end plate 41 and the electrode group 20, resulting in damage to the electrode group 20, but also it is easy to be difficult to stably and effectively support the electrode group 20 when the battery cell triggers thermal runaway. Therefore, the width M of each split end plate 41 along the third direction needs to satisfy M≥30%·A; the width of each split end plate 41 along the third direction cannot be too large, otherwise it is easy to interfere with the shell 10 during the battery cell manufacturing process and is difficult to assemble. Therefore, the width M of each split end plate 41 along the third direction needs to satisfy M<85%·A. In the present embodiment, the width M of each split end plate 41 along the third direction satisfies 30%·A≤M≤85%·A, which can not only avoid damage to the electrode group 20 due to instability of the split end plate 41 during the battery cell manufacturing process, but also can stably and effectively support the electrode group 20 when the battery cell triggers thermal runaway, and at the same time avoid interference with the shell 10 during the battery cell manufacturing process, thereby facilitating assembly.
[0060] In some embodiments, the split end plate 41 is detachably connected to the end plate body 40, for example, see Figure 5 As shown, the split end plate 41 and the end plate body 40 can be connected by a fixing strip 42, see Figure 6 As shown, the split end plate 41 and the end plate body 40 can also be connected by an adhesive tape 43, the split end plate 41 and the end plate body 40 can also be directly bonded, and the split end plate 41 and the end plate body 40 can also be bolted, which can be adjusted according to actual production conditions. In this embodiment, the split end plate 41 and the end plate body 40 are independently arranged, and the split end plate 41 and the end plate body 40 are detachably connected, which is conducive to reducing the production and processing difficulty of the split end plate 41 and the end plate body 40, and at the same time facilitates the split end plate 41 and the end plate body 40 to be put into the shell together.
[0061] In some embodiments, see Figure 7 As shown, the battery pole group fixing structure also includes:
[0062] The lower plastic body 50 is disposed on one side of the cover plate 30 along the first direction toward the electrode group 20;
[0063] The split lower plastic 51 is made of high temperature resistant material. The split lower plastic 51 and the lower plastic body 50 are independently arranged. The split lower plastic 51 is arranged on one side of the lower plastic body 50 close to the explosion-proof valve 31 along the second direction. The split lower plastic 51 is suitable for preventing the pole group 20 from moving toward the explosion-proof valve 31 along the first direction when the battery cell triggers thermal runaway.
[0064] In this embodiment, a split lower plastic 51 is provided on one side of the lower plastic body 50 close to the explosion-proof valve 31 along the second direction, and the split lower plastic 51 is provided between the electrode group 20 and the cover plate 30. The split lower plastic 51 can withstand the high temperature in the battery cell during thermal runaway. When thermal runaway occurs in the battery cell, after the internal plastic structures such as the lower plastic body 50 and the end plate body 40 in the battery cell melt and fail rapidly, the split lower plastic 51 can prevent the electrode group 20 from moving toward the explosion-proof valve 31 along the first direction, thereby preventing the electrode group 20 from blocking the explosion-proof valve 31, thereby ensuring that the battery can release pressure and dissipate heat in time during thermal runaway, thereby improving the safety performance of the battery.
[0065] It should be noted that when thermal runaway occurs in the battery cell, at least one of the split lower plastic 51 and the split end plate 41 can separate the electrode group 20 and the cover plate 30 along the first direction to form an exhaust channel, thereby preventing the electrode group 20 from blocking the explosion-proof valve 31, thereby ensuring that the battery can release pressure and dissipate heat in time when thermal runaway occurs.
[0066] In some embodiments, see Figure 7 As shown, one side of the split lower plastic 51 along the first direction abuts against the cover plate 30, and the other side abuts against the split end plate 41; when thermal runaway occurs in the battery cell, after the internal plastic structures such as the lower plastic body 50 and the end plate body 40 in the battery cell quickly melt and fail, the side of the split lower plastic 51 along the first direction toward the cover plate 30 can abut against the cover plate 30, and the side of the split end plate 41 along the first direction toward the pole group 20 can abut against the pole group 20. At the same time, the split lower plastic 51 abuts against the split end plate 41, so that when thermal runaway occurs in the battery cell, sufficient exhaust space is formed between the pole group 20 and the cover plate 30 along the first direction, which is beneficial to further improve the pressure relief efficiency and heat dissipation efficiency of the battery during thermal runaway, and improve the safety performance of the battery.
[0067] In some embodiments, see Figure 5 As shown, the split end plate 41 is provided with a first exhaust passage 411, see Figure 8 As shown, a second exhaust channel 511 is provided on the split lower plastic 51. When thermal runaway occurs in the battery cell, the first exhaust channel 411 and the second exhaust channel 511 can guide the gas generated in the accommodating cavity 101 during thermal runaway to the explosion-proof valve 31, thereby ensuring that the battery can release pressure and dissipate heat in time during thermal runaway, thereby improving the safety performance of the battery.
[0068] In some embodiments, the split end plate 41 and the split lower plastic 51 are both made of insulating, high-temperature, and electrolyte-resistant materials. For example, the split end plate 41 and the split lower plastic 51 can be made of hard ceramic silicone rubber materials, and the split end plate 41 and the split lower plastic 51 can also be made of ceramic materials. The split end plate 41 and the split lower plastic 51 use insulating, high-temperature, and electrolyte-resistant materials to protect the electrode group well during the battery cell manufacturing process and normal use, avoid abnormal lap short circuits inside the battery cell, and provide stable and effective support for the electrode group 20 when the battery cell triggers thermal runaway.
[0069] According to an embodiment of the present invention, on the other hand, a battery is provided, comprising: a battery body, and the battery pole group fixing structure as described above.
[0070] Since the battery in the present solution includes the above-mentioned battery pole group fixing structure, the battery in the present solution includes all the beneficial effects of the above-mentioned battery pole group fixing structure.
[0071] 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 battery pole group fixing structure, characterized in that: include: A shell, the inner peripheral wall of which encloses a receiving cavity, and the receiving cavity is suitable for receiving the pole group; A cover plate, which is disposed on one side of the housing along the first direction, and an explosion-proof valve is disposed on the cover plate, and the explosion-proof valve is spaced apart from the pole group along the first direction; An end plate body, arranged on one side of the pole group facing the cover plate along the first direction; A split end plate is made of high temperature resistant material. The split end plate and the end plate body are independently arranged. The split end plate is arranged on a side of the end plate body close to the explosion-proof valve along the second direction. The split end plate is suitable for preventing the pole group from moving toward the explosion-proof valve along the first direction when the battery cell triggers thermal runaway.
2. The battery pole group fixing structure according to claim 1, characterized in that: The total length of the split end plate along the second direction is L, and L satisfies 40%·A≤L≤2·A, wherein A is the total width of the accommodating cavity along the third direction.
3. The battery pole group fixing structure according to claim 2, characterized in that: The split end plate is integrally arranged in a single piece along the third direction, and the width of the split end plate along the third direction is M, where M satisfies 50%·A≤M≤85%·A.
4. The battery pole group fixing structure according to claim 2, characterized in that: A plurality of split end plates are arranged side by side along the third direction, and a width of each split end plate along the third direction is M, where M satisfies 30%·A≤M<85%·A.
5. The battery pole group fixing structure according to claim 1, characterized in that: The split end plate is detachably connected to the end plate main body.
6. The battery pole group fixing structure according to any one of claims 1 to 5, characterized in that: The battery pole group fixing structure also includes: A lower plastic body, disposed on one side of the cover plate along the first direction toward the pole group; The split lower plastic is made of high temperature resistant material. The split lower plastic and the lower plastic body are independently arranged. The split lower plastic is arranged on a side of the lower plastic body close to the explosion-proof valve along the second direction. The split lower plastic is suitable for preventing the pole group from moving toward the explosion-proof valve along the first direction when the battery cell triggers thermal runaway.
7. The battery pole group fixing structure according to claim 6, characterized in that: One side of the split lower plastic along the first direction abuts against the cover plate, and the other side abuts against the split end plate.
8. The battery pole group fixing structure according to claim 7, characterized in that: A first exhaust channel is provided on the split end plate, and a second exhaust channel is provided on the split lower plastic. The first exhaust channel and the second exhaust channel are suitable for guiding the gas generated in the accommodating cavity during thermal runaway to the explosion-proof valve.
9. The battery pole group fixing structure according to claim 6, characterized in that: The split end plate and the split lower plastic are both made of insulating, high-temperature and electrolyte-resistant materials.
10. A battery, characterized in that: include: A battery body, and a battery pole group fixing structure as described in any one of claims 1 to 9.