Battery pole group fixing structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pole group fixing structure and a battery, the battery pole group fixing structure comprises a shell, the inner side peripheral wall of the shell is enclosed to form a containing cavity, and the containing cavity is suitable for containing a pole group; an anti-explosion valve is arranged on the cover plate; the side plate is arranged on one side of the pole group along the second direction; the end plate is arranged on one side, facing the cover plate in the first direction, of the pole group; an avoiding groove is formed in the side, close to the side plate, of the end plate in the second direction; the first check block is arranged at the end, close to the anti-explosion valve, of the side plate in the first direction, and the first check block is formed by protruding the side plate towards the end plate in the second direction and extends into the receding groove; the two sides of the first direction of the first stop block are suitable for being propped against the pole group and the cover plate respectively when the battery cell triggers thermal runaway. According to the battery pole group fixing structure provided by the utility model, the pole group can be prevented from moving towards the explosion-proof valve along the first direction, the explosion-proof valve is prevented from being shielded by the pole group, and the safety performance of a battery is improved.

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] A side plate, arranged on one side of the pole group along the second direction;

[0010] The end plate is arranged on the side of the pole group facing the cover plate along the first direction; the side of the end plate close to the side plate along the second direction is provided with an avoidance groove;

[0011] The first stopper is made of high temperature resistant material and is arranged at one end of the side plate along the first direction close to the explosion-proof valve. The first stopper is formed by the side plate protruding along the second direction toward the end plate and extending into the avoidance groove; the two sides of the first direction of the first stopper are suitable for respectively abutting against the pole group and the cover plate when the battery cell triggers thermal runaway, so as to prevent the pole group from moving toward the explosion-proof valve along the first direction.

[0012] The battery pole group fixing structure provided by the utility model is provided with a first stopper at one end of the side plate close to the explosion-proof valve along the first direction, so that the first stopper is formed by the side plate protruding toward the end plate along the second direction and extending to between the pole group and the cover plate, and the first stopper 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 in the battery cell quickly melt and fail, one side of the first stopper 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.

[0013] In an optional implementation, the width of the first stopper along the third direction is W, and W satisfies 0.3·A≤W≤0.8·A, wherein A is the width of the accommodating cavity along the third direction.

[0014] This arrangement can, on the one hand, enable the first stopper to stably support the pole group, while preventing the first stopper from being embedded in the pole group due to being too small, thereby preventing damage to the pole group; on the other hand, it can avoid interference between the first stopper and the end plate, thereby facilitating assembly.

[0015] In an optional implementation, the first stopper is integrally provided in a single block along the third direction, and a width W of the first stopper along the third direction satisfies 0.5·B≤W≤B, wherein B is a thickness of the pole group along the third direction.

[0016] By such arrangement, on the one hand, the first stopper can be prevented from supporting instability when thermal runaway occurs in the battery cell, thereby ensuring sufficient exhaust space between the electrode group and the explosion-proof valve; on the other hand, interference between the first stopper and the shell 10 can be avoided when entering the shell, thereby facilitating smooth entry of the electrode group into the shell.

[0017] In an optional embodiment, multiple first blocks are arranged side by side along the third direction, and the width W of each first block along the third direction satisfies 0.4·B / N≤W≤0.9·B / N, wherein B is the thickness of the pole group along the third direction, and N is the number of first blocks arranged along the third direction.

[0018] Through such an arrangement, on the one hand, the first stopper can be prevented from supporting instability when thermal runaway occurs in the battery cell, thereby ensuring sufficient exhaust space between the electrode group and the explosion-proof valve. On the other hand, interference between the first stopper and the shell can be avoided when entering the shell, thereby facilitating smooth entry of the electrode group into the shell.

[0019] In an optional implementation, a length of the first stopper along the second direction is M, and M satisfies 4mm≤M≤20mm.

[0020] Through such an arrangement, on the one hand, the first stopper can be prevented from supporting instability when thermal runaway occurs in the battery cell, thereby ensuring sufficient exhaust space between the electrode group and the explosion-proof valve; on the other hand, the first stopper can be prevented from being too heavy, thereby saving the production cost of the first stopper and avoiding affecting the mass energy density of the battery cell.

[0021] In an optional embodiment, the size of the first stopper also satisfies Wherein, C is the distance between two opposite notches on the upper edge of the explosion-proof valve in the third direction.

[0022] By such an arrangement, the first stopper can be prevented from tilting and flying out from the detonation opening of the explosion-proof valve when the battery cell triggers thermal runaway, thereby improving the safety performance of the battery.

[0023] In an optional implementation, a height of the first stopper along the first direction is H, and H satisfies 4mm≤H≤20mm.

[0024] Through such an arrangement, on the one hand, sufficient exhaust channels can be ensured between the pole group and the explosion-proof valve when thermal runaway occurs in the battery cell, so that exhaust and heat can be dissipated in time when thermal runaway occurs in the battery cell, and on the other hand, the capacity of the battery cell can be guaranteed.

[0025] In an optional implementation, a distance between a side of the first stopper close to the side plate along the second direction and a side of the side plate away from the pole group along the second direction is L, and L satisfies 0≤L≤20 mm.

[0026] This arrangement can avoid interference between the first stopper and the shell when the electrode group is inserted into the shell, thereby ensuring smooth insertion of the electrode group into the shell; it can also avoid excessive weight of the first stopper, thereby saving the production cost of the first stopper and avoiding affecting the mass energy density of the battery cell.

[0027] In an optional embodiment, the battery pole group fixing structure also includes a second stopper, which is made of high temperature resistant material. The second stopper is built into the side plate, and the two sides of the second direction of the second stopper are suitable for respectively abutting against the pole group and the inner wall of the shell when the battery cell triggers thermal runaway, so as to prevent the pole group from moving toward the inner wall of the shell along the second direction.

[0028] Through such an arrangement, when thermal runaway occurs in the battery cell, after the internal plastic structures such as the side panels in the battery cell quickly melt and fail, the two sides of the second direction of the second stopper can respectively abut against the inner wall of the pole group and the shell to prevent the pole group from moving toward the inner wall of the shell along the second direction, thereby forming an exhaust channel between the pole group and the inner wall of the shell, ensuring that the battery can release pressure and dissipate heat in time when thermal runaway occurs, thereby improving the safety performance of the battery.

[0029] 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.

[0030] 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

[0031] 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.

[0032] Figure 1 A schematic diagram of the three-dimensional structure of a battery pole group fixing structure according to an embodiment of the utility model;

[0033] Figure 2 for Figure 1 A local enlarged schematic diagram of the K in the middle;

[0034] Figure 3 A schematic diagram of a housing cavity of a battery pole group fixing structure according to an embodiment of the utility model;

[0035] Figure 4 for Figure 2 A schematic diagram of a partial cross-sectional structure;

[0036] Figure 5 A schematic diagram of the three-dimensional structure of another battery electrode group fixing structure according to an embodiment of the utility model;

[0037] Figure 6 A cross-sectional schematic diagram of another first stopper of a battery pole group fixing structure according to an embodiment of the utility model;

[0038] Figure 7 A cross-sectional schematic diagram of another first stopper of a battery pole group fixing structure according to an embodiment of the utility model;

[0039] Figure 8A schematic diagram of the top view of an explosion-proof valve of a battery pole group fixing structure according to an embodiment of the utility model;

[0040] Fig. 9 It is a schematic diagram of the three-dimensional structure of another battery pole group fixing structure according to an embodiment of the utility model.

[0041] Description of reference numerals:

[0042] 10. housing; 101. accommodating chamber;

[0043] 20. Pole group;

[0044] 30. Cover plate; 31. Explosion-proof valve; 311. Score;

[0045] 40. side plate; 41. first stopper; 42. second stopper;

[0046] 50. End plate; 501. Avoidance groove. 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 9 , 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 chamber 101, and the receiving chamber 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] A side plate 40, disposed on one side of the electrode group 20 along the second direction;

[0054] The end plate 50 is disposed on one side of the electrode group 20 facing the cover plate 30 along the first direction; a side of the end plate 50 close to the side plate 40 along the second direction is provided with an avoidance groove 501;

[0055] The first stopper 41 is made of a high temperature resistant material and is disposed at one end of the side plate 40 close to the explosion-proof valve 31 along the first direction. The first stopper 41 is formed by the side plate 40 protruding toward the end plate 50 along the second direction and extending into the avoidance groove 501. Both sides of the first direction of the first stopper 41 are suitable for respectively abutting against the pole group 20 and the cover plate 30 when the battery cell triggers thermal runaway, so as to prevent the pole group 20 from moving toward the explosion-proof valve 31 along the first direction.

[0056] It should be noted that, during the battery cell manufacturing process, the weld is usually arranged on the side of the shell 10 along the second direction toward the electrode group 20, and the side plate 40 is arranged on the side of the electrode group 20 along the second direction, so that the side plate 40 isolates the electrode group 20 from the weld, thereby protecting the electrode group 20 and preventing the weld from scratching the electrode group 20 and / or the film covering the electrode group 20. At the same time, the side plate 40 can be made of plastic materials such as PP, which can well protect the electrode group 20 during the battery cell manufacturing process and normal use, and avoid abnormal overlap and short circuit inside the battery cell.

[0057] Furthermore, an exhaust channel is provided on the side plate 40, which is not only beneficial to exhaust and heat dissipation inside the battery cell, but also beneficial to reducing the weight of the battery cell.

[0058] The battery pole group fixing structure provided in the present embodiment is provided with a first stopper 41 at one end of the side plate 40 close to the explosion-proof valve 31 along the first direction, so that the first stopper 41 is formed by the side plate 40 protruding toward the end plate 50 along the second direction and extending to between the pole group 20 and the cover plate 30, and the first stopper 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 50 in the battery cell quickly melts and fails, one side of the first stopper 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, 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.

[0059] It should be noted that when the first stop block 41 and the side panel 40 are integrally formed, both the first stop block 41 and the side panel 40 can be made of high-temperature resistant materials. Further, both the first stop block 41 and the side panel 40 are made of insulating, high-temperature resistant and electrolyte resistant materials. For example, the first stop block 41 and the side panel 40 can be made of hard ceramic silicone rubber materials, and the first stop block 41 and the side panel 40 can also be made of ceramic materials; of course, the side panel 40 can also be made of plastic materials such as PP and PET, and only the first stop block 41 is made of insulating, high-temperature resistant and electrolyte resistant materials such as hard ceramic silicone rubber and ceramic. The first stop block 41 can be fixedly connected to one end of the side panel 40 along the first direction close to the explosion-proof valve 31.

[0060] In some embodiments, see Figure 2 As shown, the first stopper 41 is built into the avoidance groove 501 of the end plate 50, and the first stopper 41 is arranged on the side of the electrode group 20 facing the cover plate 30 along the first direction. The width of the first stopper 41 along the third direction cannot be too small, otherwise the first stopper 41 will be difficult to stably support the electrode group 20, and may even be embedded in the electrode group 20, causing damage to the electrode group 20. Therefore, the width W of the first stopper 41 along the third direction needs to satisfy W≥0.3·A, where, Figure 3 As shown, A is the width of the accommodating cavity 101 along the third direction; the width of the first stopper 41 along the third direction cannot be too large, otherwise the first stopper 41 is easy to interfere with the end plate 50, therefore, please refer to Figure 4 As shown, the width W of the first stopper 41 along the third direction also needs to satisfy W≤0.8·A. In this embodiment, the width W of the first stopper 41 along the third direction satisfies 0.3·A≤W≤0.8·A, where A is the width of the accommodating cavity 101 along the third direction. On the one hand, the first stopper 41 can stably support the pole group 20, and at the same time, it can prevent the first stopper 41 from being embedded in the pole group 20 due to being too small, thereby preventing damage to the pole group 20. On the other hand, it can prevent the first stopper 41 from interfering with the end plate 50, thereby facilitating assembly.

[0061] In some embodiments, see Figure 4As shown, the first stopper 41 can be set as a single block along the third direction. The width of the first stopper 41 along the third direction cannot be too small, otherwise the first stopper 41 is prone to support instability and tilt when thermal runaway occurs in the battery cell, resulting in too small an exhaust space between the electrode group 20 and the explosion-proof valve 31. Therefore, the width W of the first stopper 41 along the third direction needs to satisfy W≥0.5·B, where B is the thickness of the electrode group 20 along the third direction; the width of the first stopper 41 along the third direction cannot be too large, otherwise the first stopper 41 is prone to interfere with the shell 10 when entering the shell, resulting in the inability of the electrode group to enter the shell. Therefore, the width W of the first stopper 41 along the third direction also needs to satisfy W≤B. In this embodiment, the width W of the first stopper 41 along the third direction satisfies 0.5·B≤W≤B, where B is the thickness of the electrode group 20 along the third direction. On the one hand, this can prevent the first stopper 41 from supporting instability when thermal runaway occurs in the battery cell, thereby ensuring sufficient exhaust space between the electrode group 20 and the explosion-proof valve 31. On the other hand, this can prevent the first stopper 41 from interfering with the shell 10 when entering the shell, thereby facilitating the smooth entry of the electrode group into the shell.

[0062] In some embodiments, see Figure 5 As shown, multiple first blocks 41 can also be arranged side by side along the third direction, wherein the width of each first block 41 along the third direction cannot be too small, otherwise the first block 41 is prone to support instability and tilt when thermal runaway occurs in the battery cell, resulting in too small an exhaust space between the electrode group 20 and the explosion-proof valve 31. Therefore, the width W of each first block 41 along the third direction needs to satisfy W≥0.4·B / N, wherein B is the thickness of the electrode group 20 along the third direction, and N is the number of first blocks 41 arranged along the third direction; the width of each first block 41 along the third direction cannot be too large, otherwise the first block 41 is prone to interfere with the shell 10 when entering the shell, resulting in the inability of the electrode group to enter the shell. Therefore, the width W of the first block 41 along the third direction needs to satisfy W≤0.9·B / N. In the present embodiment, the width W of each first stopper 41 along the third direction satisfies 0.4·B / N≤W≤0.9·B / N, wherein B is the thickness of the electrode group 20 along the third direction, and N is the number of first stoppers 41 arranged along the third direction. On the one hand, this can prevent the first stopper 41 from supporting instability when thermal runaway occurs in the battery cell, thereby ensuring sufficient exhaust space between the electrode group 20 and the explosion-proof valve 31. On the other hand, this can prevent the first stopper 41 from interfering with the shell 10 when entering the shell, thereby facilitating the smooth entry of the electrode group into the shell.

[0063] For further information, see Figure 6 and Figure 7As shown, when multiple first blocks 41 are arranged side by side along the third direction, one or more reinforcing ribs can be set between each two adjacent first blocks 41 along the third direction, which can not only enhance the overall structural strength of the multiple first blocks 41, but also avoid the first blocks 41 from supporting instability when thermal runaway occurs in the battery cell, thereby ensuring that the multiple first blocks 41 can effectively and stably support between the pole group 20 and the cover plate 30, so that there is enough exhaust space between the pole group 20 and the explosion-proof valve 31. At the same time, compared with the first block 41 being arranged as a single block along the third direction, it is beneficial to reduce the total weight of the first block 41 and improve the mass energy density of the battery cell.

[0064] In some embodiments, see Figure 4 As shown, the length of the first stopper 41 along the second direction is M. If the length of the first stopper 41 along the second direction is too small, the first stopper 41 is easy to support instability and tilt when the battery cell has thermal runaway, resulting in too small exhaust space between the pole group 20 and the explosion-proof valve 31. Therefore, the length M of the first stopper 41 along the second direction needs to satisfy M≥4mm; if the length of the first stopper 41 along the second direction is too large, it is easy to increase the weight of the first stopper 41, which is not only easy to increase the production cost of the first stopper 41, but also easy to affect the mass energy density of the battery cell. Therefore, the length M of the first stopper 41 along the second direction needs to satisfy M≤20mm. In this embodiment, the length M of the first stopper 41 along the second direction satisfies 4mm≤M≤20mm, which can, on the one hand, avoid the first stopper 41 from supporting instability when the battery cell has thermal runaway, ensure sufficient exhaust space between the pole group 20 and the explosion-proof valve 31, and on the other hand, avoid the first stopper 41 from being too heavy, save the production cost of the first stopper 41, and avoid affecting the mass energy density of the battery cell.

[0065] Preferably, the length M of the first stopper 41 along the second direction is in the range of 4 mm ≤ M ≤ 8 mm.

[0066] In some embodiments, see Figure 1 As shown, the first stopper 41 is arranged on the side of the pole group 20 facing the cover plate 30 along the first direction, and the first stopper 41 and the explosion-proof valve 31 are staggered in the second direction. When the battery cell triggers thermal runaway, one side of the first stopper 41 along the first direction can abut against the cover plate 30, and the other side abuts against the pole group 20. However, the projection of the ignition opening of the explosion-proof valve 31 along the first direction toward the side of the pole group 20 still overlaps with the first stopper 41 at least partially, wherein the ignition opening of the explosion-proof valve 31 refers to the area enclosed by the notch 311 on the explosion-proof valve 31; in this example, the size of the first stopper 41 also satisfies Among them, Figure 8As shown, C is the distance between two notches 311 on the explosion-proof valve 31 that are opposite to each other along the third direction, thereby preventing the first stopper 41 from tilting and flying out from the detonation opening of the explosion-proof valve 31 when the battery cell triggers thermal runaway, thereby improving the safety performance of the battery.

[0067] In some embodiments, see Figure 4 As shown, the height of the first stopper 41 along the first direction is H. The height of the first stopper 41 along the first direction cannot be too small, otherwise it is easy to cause the exhaust channel between the pole group 20 and the explosion-proof valve 31 to be too small when the battery cell has thermal runaway, affecting the exhaust and heat dissipation of the battery cell during thermal runaway. Therefore, the height H of the first stopper 41 along the first direction needs to satisfy H≥4mm; since the internal space of the accommodating cavity 101 of the shell 10 is limited, the height of the first stopper 41 along the first direction cannot be too large, otherwise it is easy to affect the size of the pole group 20, resulting in a reduction in the capacity of the battery cell. Therefore, the height H of the first stopper 41 along the first direction also needs to satisfy H≤20mm. In this embodiment, the height H of the first stopper 41 along the first direction satisfies 4mm≤H≤20mm, which can ensure sufficient exhaust channels between the pole group 20 and the explosion-proof valve 31 when the battery cell has thermal runaway, so that the battery cell can be exhausted and dissipated in time when the battery cell has thermal runaway, and can ensure the capacity of the battery cell on the other hand.

[0068] In some embodiments, see Figure 4 As shown, the distance between the side of the first stopper 41 close to the side plate 40 along the second direction and the side of the side plate 40 away from the pole group 20 along the second direction is L. When L=0, the side of the first stopper 41 close to the side plate 40 along the second direction is flush with the side of the side plate 40 away from the pole group 20 along the second direction. If L<0, the side of the first stopper 41 close to the side plate 40 along the second direction will exceed the side of the side plate 40 away from the pole group 20 along the second direction. When the first stopper 41 is inserted into the shell, it is easy to interfere with the shell 10. As a result, the pole group 20 cannot enter the shell. Therefore, the distance L between the side of the first stopper 41 close to the side plate 40 along the second direction and the side of the side plate 40 away from the pole group 20 along the second direction must satisfy L≥0; the distance between the side of the first stopper 41 close to the side plate 40 along the second direction and the side of the side plate 40 away from the pole group 20 along the second direction cannot be too large, otherwise it is easy to increase the weight of the first stopper 41, which not only increases the production cost of the first stopper 41, but also affects the mass energy density of the battery cell. In this embodiment, the distance L between the side of the first stopper 41 close to the side plate 40 along the second direction and the side of the side plate 40 away from the pole group 20 along the second direction satisfies 0≤L≤20mm, which can avoid the interference between the first stopper 41 and the shell 10 when entering the shell, ensure that the pole group 20 enters the shell smoothly, and avoid the first stopper 41 from being too heavy, saving the production cost of the first stopper 41, and avoiding affecting the mass energy density of the battery cell.

[0069] In some embodiments, see Fig. 9 As shown, the battery pole group fixing structure also includes a second stopper 42, which is made of high temperature resistant material and is built into the side plate 40. The second stopper 42 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 side plate 40 in the battery cell quickly melt and fail, the two sides of the second direction of the second stopper 42 can respectively abut against the pole group 20 and the inner side walls of the shell 10 to prevent the pole group 20 from moving toward the inner side wall of the shell 10 along the second direction, thereby forming an exhaust channel between the pole group 20 and the inner side wall of the shell 10, ensuring that the battery can be depressurized and dissipated in time during thermal runaway, thereby improving the safety performance of the battery.

[0070] It should be noted that the second stopper 42 can be made of insulating, high temperature resistant and electrolyte resistant materials such as hard ceramic silicone rubber, ceramics, etc. The second stopper 42 and the side plate 40 can both be made of insulating, high temperature resistant and electrolyte resistant materials, and the second stopper 42 and the side plate 40 are integrally formed; of course, the side plate 40 can also be made of plastic materials such as PP, PET, etc., and only the second stopper 42 is made of insulating, high temperature resistant and electrolyte resistant materials such as hard ceramic silicone rubber, ceramics, etc., and the second stopper 42 is covered by the side plate 40.

[0071] 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.

[0072] 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.

[0073] 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; A side plate, arranged on one side of the pole group along the second direction; An end plate is arranged on a side of the pole group facing the cover plate along the first direction; a side of the end plate close to the side plate along the second direction is provided with an avoidance groove; The first stopper is made of a high temperature resistant material, and is arranged at one end of the side plate close to the explosion-proof valve along the first direction. The first stopper is formed by the side plate protruding along the second direction toward the end plate and extending into the avoidance groove; the two sides of the first direction of the first stopper are suitable for respectively abutting against the pole group and the cover plate when the battery cell triggers thermal runaway, so as to prevent the pole group from moving toward the explosion-proof valve along the first direction.

2. The battery pole group fixing structure according to claim 1, characterized in that: The width of the first stopper along the third direction is W, and W satisfies 0.3·A≤W≤0.8·A, wherein A is the width of the accommodating cavity along the third direction.

3. The battery pole group fixing structure according to claim 2, characterized in that: The first stopper is integrally arranged in a single block along the third direction, and a width W of the first stopper along the third direction satisfies 0.5·B≤W≤B, wherein B is a thickness of the pole group along the third direction.

4. The battery pole group fixing structure according to claim 2, characterized in that: A plurality of the first blocks are arranged side by side along the third direction, and a width W of each of the first blocks along the third direction satisfies 0.4·B / N≤W≤0.9·B / N, wherein B is the thickness of the pole group along the third direction, and N is the number of the first blocks arranged along the third direction.

5. The battery pole group fixing structure according to claim 2, characterized in that: The length of the first stopper along the second direction is M, and M satisfies 4mm≤M≤20mm.

6. The battery pole group fixing structure according to claim 5, characterized in that: The size of the first stopper also satisfies Wherein, C is the distance between two opposite notches on the explosion-proof valve along the third direction.

7. The battery pole group fixing structure according to claim 1, characterized in that: The height of the first stopper along the first direction is H, and H satisfies 4mm≤H≤20mm.

8. The battery pole group fixing structure according to claim 1, characterized in that: A distance between a side of the first stopper close to the side plate along the second direction and a side of the side plate away from the pole group along the second direction is L, and L satisfies 0≤L≤20 mm.

9. The battery pole group fixing structure according to any one of claims 1 to 8, characterized in that: The battery pole group fixing structure also includes a second stopper, which is made of high temperature resistant material and is built into the side plate. Both sides of the second direction of the second stopper are suitable for respectively abutting against the pole group and the inner side walls of the shell when the battery cell triggers thermal runaway, so as to prevent the pole group from moving toward the inner side wall of the shell along the second direction.

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.

Images