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; the cover plate is arranged on one side, in the first direction, of the shell in a covering mode, an anti-explosion valve is arranged on the cover plate, and the anti-explosion valve and the pole group are arranged in a spaced mode in the first direction; the end plate is sunken towards one side of the cover plate along the first direction to form an avoiding groove; the lower plastic is arranged between the end plate and the cover plate, and the lower plastic comprises a convex part; and the convex hull is arranged in the avoiding groove, the convex hull is connected with the outer wall of the convex part, and the two sides of the first direction of the convex hull are suitable for abutting 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, and the explosion-proof valve is prevented from being shielded by the pole group, so that the battery can be ensured to timely release pressure and dissipate heat during thermal runaway, and the safety performance of the 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] An end plate is arranged on one side of the pole group facing the cover plate along the first direction, and the end plate is recessed along the first direction toward the cover plate to form an avoidance groove;

[0010] The lower plastic is arranged between the end plate and the cover plate, and the lower plastic comprises a main body wall and a protrusion formed by the main body wall extending along a first direction toward the pole group;

[0011] The convex bulge is built into the avoidance groove, the convex bulge is connected to the outer wall of the raised part, and the two sides of the convex bulge in the first direction 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 has a protrusion formed by the main body wall of the lower plastic extending toward the pole group along the first direction, and an avoidance groove formed by the end plate being recessed toward one side of the cover plate along the first direction. A convex bump is provided between the end plate and the lower plastic, the convex bump is built into the avoidance groove, and the convex bump is connected to the outer wall of the protrusion, so that the convex bump 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 and the lower plastic in the battery cell quickly melt and fail, one side of the convex bump 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 embodiment, the total height of the convex hull along the first direction is H, H satisfies 0.5·M≤H≤3·M, wherein M satisfies N≤M≤5·N, M is the total thickness of the lower plastic along the first direction, and N is the thickness of the main body wall along the first direction.

[0014] 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.

[0015] In an optional embodiment, the total width of the convex hull along the third direction is L, and L satisfies D≤L≤1.2·T, wherein D is the distance between two notches oppositely arranged along the third direction on the explosion-proof valve, and T is the total width of the lower plastic along the third direction.

[0016] Through such an arrangement, on the one hand, the convex bulge support can be prevented from becoming unstable when thermal runaway occurs in the battery cell, thereby ensuring that the convex bulge stably supports the pole group. On the other hand, when the battery cell triggers thermal runaway, the convex bulge can be prevented from flying out of the detonation opening of the explosion-proof valve. At the same time, interference between the convex bulge and the shell can be avoided during the battery cell manufacturing process, thereby facilitating assembly.

[0017] In an optional embodiment, the bulge includes a base plate, and a first side plate and a second side plate formed by the base plate extending along a first direction away from the base plate, wherein the first side plate is arranged on both sides of the base plate in the third direction, and the second side plate is arranged on both sides of the base plate in the second direction, the base plate is covered on one side of the protrusion along the first direction toward the pole group, and the first side plate and the second side plate are covered on the outer peripheral wall of the protrusion.

[0018] Through such an arrangement, the bottom plate, the first side plate and the second side plate can jointly thermally isolate the protrusion from the pole group; when thermal runaway occurs in the battery cell, the convex bump can not only support the pole group alone, but also the convex bump can support the pole group together with the covered part of the protrusion (the part of the protrusion that has not melted temporarily during thermal runaway) at the same time, thereby preventing the pole group from moving toward the end plate along the first direction, avoiding the pole group from blocking the explosion-proof valve.

[0019] In an optional implementation, the thickness of the first side plate and the second side plate are both Q, and Q satisfies 0.5 mm≤Q≤0.5·T.

[0020] Such an arrangement is beneficial for processing on the one hand, and on the other hand, the supporting stiffness of the first side plate and the second side plate is ensured, thereby providing stable support for the pole group when the battery cell triggers thermal runaway, while ensuring the mass energy density of the battery cell, which is beneficial for lightweighting the battery cell.

[0021] In an optional implementation, the distance between the bottom plate and the inner bottom wall of the avoidance groove is P, and P satisfies 0≤P≤5mm.

[0022] Through such an arrangement, on the one hand, interference between the bulge and the end plate can be avoided during the manufacturing process, thereby facilitating the assembly of the bulge; on the other hand, the total height of the bulge along the first direction can be ensured, ensuring sufficient exhaust channels 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.

[0023] In an optional embodiment, a first limiting groove is opened on the raised portion along the second direction and / or the third direction; a reinforcing rib is arranged between the first side plate and / or the second side plate and the bottom plate; and the reinforcing rib is clamped in the first limiting groove.

[0024] By so configuring, reinforcing ribs are provided between the first side plate and / or the second side plate and the bottom plate, thereby enhancing the overall supporting strength of the bulge, and ensuring the stability of the bulge in supporting the electrode group when the battery cell triggers thermal runaway; the reinforcing ribs are engaged with the first limiting groove, thereby limiting the position of the bulge, and facilitating the bulge to enter the shell together with the end plate and the lower plastic during the manufacturing process.

[0025] In an optional embodiment, a second limiting groove is formed between the first side plate and the second side plate; convex ribs are provided on both sides of the third direction of the raised portion; and the convex ribs are clamped in the second limiting groove.

[0026] By such arrangement, during the manufacturing process, the convex rib is clamped in the second limiting groove, so as to limit the convex bump, which is convenient for the convex bump to be put into the shell together with the end plate and the lower plastic during the manufacturing process.

[0027] In an optional embodiment, the convex hull is made of an insulating, high-temperature and electrolyte-resistant material.

[0028] 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.

[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. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] 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;

[0032] Figure 2 for Figure 1 A local enlarged schematic diagram of the K in the middle;

[0033] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the lower plastic;

[0034] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the convex hull in;

[0035] Figure 5 A top view of a battery pole group fixing structure after hiding the housing and pole group according to an embodiment of the utility model;

[0036] Figure 6 for Figure 5 Top view of the middle explosion-proof valve;

[0037] Figure 7 for Figure 1 Top view of the convex hull in ;

[0038] Figure 8 for Figure 2A partial enlarged schematic diagram of the lower plastic in FIG.

[0039] Fig. 9 for Figure 5 Cross-sectional view of the FF section;

[0040] Fig.10 for Fig. 9 A local enlarged schematic diagram of point G in the middle.

[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. end plate; 41. avoidance groove;

[0046] 50, lower plastic; 51, main body wall; 52, raised portion; 53, first limiting groove; 54, convex rib;

[0047] 60. convex bump; 61. bottom plate; 62. first side plate; 63. second side plate; 64. reinforcing rib; 65. second limiting groove. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] Combine the following Figures 1 to 10 , describing an embodiment of the utility model.

[0051] According to an embodiment of the present utility model, on the one hand, a battery pole group fixing structure is provided, comprising:

[0052] 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;

[0053] 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.

[0054] The end plate 40 is disposed on one side of the pole group 20 facing the cover plate 30 along the first direction, and the end plate 40 is recessed along the first direction toward the cover plate 30 to form an avoidance groove 41;

[0055] The lower plastic 50 is disposed between the end plate 40 and the cover plate 30 , and includes a main body wall 51 and a protrusion 52 formed by the main body wall 51 extending along a first direction toward the pole group 20 ;

[0056] The convex bump 60 is built into the avoidance groove 41, and is connected to the outer wall of the raised portion 52. The two sides of the convex bump 60 in the first direction 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.

[0057] Furthermore, the end plate 40 and the lower plastic 50 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, and avoid abnormal bridging and short circuit inside the battery cell.

[0058] In the battery pole group fixing structure provided in the present embodiment, the protrusion 52 is formed by the main body wall 51 of the lower plastic 50 extending toward the pole group 20 along the first direction, and the avoidance groove 41 is formed by the end plate 40 being recessed toward one side of the cover plate 30 along the first direction. By arranging a convex bump 60 between the end plate 40 and the lower plastic 50, the convex bump 60 is built into the avoidance groove 41, and the convex bump 60 is connected to the outer wall of the protrusion 52, the convex bump 60 can withstand the high temperature in the battery cell during thermal runaway; when the battery cell has thermal runaway, when the internal plastic structures such as the end plate 40 and the lower plastic 50 in the battery cell quickly melt and fail, the convex bump 60 can abut against the pole group 20 on one side along the first direction, and can abut against the cover plate 30 on the other side, 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 then ensuring that the battery can release pressure and dissipate heat in time during thermal runaway, thereby improving the safety performance of the battery.

[0059] In some embodiments, see Figure 4As shown, the total height of the convex hump 60 along the first direction is H. The total height of the convex hump 60 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 when the battery cell has thermal runaway. Therefore, the total height H of the convex hump 60 along the first direction needs to satisfy H≥0.5·M, where M satisfies N≤M≤5·N, see Figure 3 As shown, M is the total thickness of the lower plastic 50 along the first direction, and N is the thickness of the main wall 51 along the first direction; the total height of the convex bump 60 along the first direction cannot be too large. Since the internal space of the accommodating cavity 101 of the shell 10 is limited, the total height of the convex bump 60 along the first direction cannot be too large, otherwise it will easily affect the size of the pole group 20, resulting in a reduction in the capacity of the battery cell. Therefore, the total height H of the convex bump 60 along the first direction must also satisfy H≤3·M. In this embodiment, the total height H of the convex bump 60 along the first direction satisfies 0.5·M≤H≤3·M. On the one hand, it 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 it has thermal runaway, and on the other hand, it can ensure the capacity of the battery cell.

[0060] In some embodiments, see Figure 4 As shown, the total width of the convex hump 60 along the third direction is L. If the total width of the convex hump 60 along the third direction is too small, on the one hand, when the battery cell undergoes thermal runaway, the convex hump 60 is prone to support instability and is difficult to stably support the electrode group 20. On the other hand, when the convex hump 60 is arranged near the explosion-proof valve 31 along the second direction, if the total width of the convex hump 60 along the third direction is too small, when the battery cell triggers thermal runaway, the convex hump 60 is prone to fly out from the detonation opening of the explosion-proof valve 31, wherein the detonation opening of the explosion-proof valve 31 refers to the area enclosed by the notch 311 on the explosion-proof valve 31. Therefore, the total width L of the convex hump 60 along the third direction needs to satisfy L≥D, wherein, as Figure 6 As shown, D is the distance between the two notches 311 arranged opposite to each other along the third direction on the explosion-proof valve 31; if the total width of the convex bump 60 along the third direction is too large, it is easy to interfere with the housing 10 during the cell manufacturing process and is not easy to assemble. Therefore, the total width L of the convex bump 60 along the third direction must also satisfy L≤1.2·T, where, Figure 3As shown, T is the total width of the lower plastic 50 along the third direction. In this embodiment, the total width L of the convex bump 60 along the third direction satisfies D≤L≤1.2·T, where D is the distance between the two notches 311 arranged oppositely along the third direction on the explosion-proof valve 31, and T is the total width of the lower plastic 50 along the third direction. On the one hand, it can prevent the convex bump 60 from supporting instability when the battery cell has thermal runaway, and ensure that the convex bump 60 stably supports the electrode group 20. On the other hand, it can prevent the convex bump 60 from flying out of the detonation opening of the explosion-proof valve 31 when the battery cell triggers thermal runaway, and at the same time, it can prevent the convex bump 60 from interfering with the shell 10 during the battery cell manufacturing process, which is convenient for assembly.

[0061] In some embodiments, the convex bump 60 is made of a high temperature resistant material. Figure 4 As shown, the convex bump 60 includes a bottom plate 61, and a first side plate 62 and a second side plate 63 formed by the bottom plate 61 extending along a first direction away from the bottom plate 61, wherein the first side plate 62 is arranged on both sides of the bottom plate 61 in the third direction, and the second side plate 63 is arranged on both sides of the bottom plate 61 in the second direction, the bottom plate 61 is covered on one side of the protrusion 52 along the first direction toward the pole group 20, and the first side plate 62 and the second side plate 63 are covered on the outer peripheral wall of the protrusion 52; The plate 61, the first side plate 62 and the second side plate 63 can jointly thermally isolate the protrusion 52 from the pole group 20; when thermal runaway occurs in the battery cell, the convex bump 60 can not only support the pole group 20 alone, but also the convex bump 60 can support the pole group 20 together with the covered part of the protrusion 52 (the part of the protrusion 52 that has not melted yet during thermal runaway) to prevent the pole group 20 from moving toward the end plate 40 along the first direction, thereby avoiding the pole group 20 blocking the explosion-proof valve 31.

[0062] In some embodiments, see Figure 7 As shown, the thickness of the first side plate 62 and the second side plate 63 are both Q. If the thickness of the first side plate 62 and the second side plate 63 is too small, on the one hand, it cannot be processed, and on the other hand, it is easy to cause the first side plate 62 and the second side plate 63 to have insufficient support rigidity, and it is difficult to stably support the electrode group 20 when the battery cell triggers thermal runaway. Therefore, the thickness Q of the first side plate 62 and the second side plate 63 must satisfy Q≥0.5mm; if the thickness of the first side plate 62 and the second side plate 63 is too large, it is easy to increase the weight of the battery cell, resulting in a decrease in the mass energy density of the battery cell. Therefore, the thickness Q of the first side plate 62 and the second side plate 63 must also satisfy Q≤0.5·T, where, as Figure 3As shown, T is the total width of the lower plastic 50 along the third direction. In this example, the thickness Q of the first side plate 62 and the second side plate 63 satisfies 0.5 mm ≤ Q ≤ 0.5·T, which is beneficial to processing on the one hand, and ensures the support stiffness of the first side plate 62 and the second side plate 63 on the other hand, so as to stably support the electrode group 20 when the battery cell triggers thermal runaway, and at the same time can ensure the mass energy density of the battery cell, which is beneficial to the lightweight of the battery cell.

[0063] It should be noted that the thicknesses of the first side plate 62 and the second side plate 63 may be equal or different.

[0064] In some embodiments, see Fig.10 As shown, the distance between the bottom plate 61 and the inner bottom wall of the avoidance groove 41 is P, and P satisfies 0≤P≤5mm. On the one hand, it can avoid interference between the convex hump 60 and the end plate 40 during the manufacturing process, which is convenient for the assembly of the convex hump 60. On the other hand, it can ensure the total height of the convex hump 60 along the first direction, and ensure sufficient exhaust channels between the pole group 20 and the explosion-proof valve 31 when thermal runaway occurs in the battery cell, so that the battery cell can be exhausted and heat dissipated in time when thermal runaway occurs.

[0065] In some embodiments, see Figure 8 As shown, a first limiting groove 53 is formed on the protruding portion 52 along the second direction and / or the third direction; see Figure 4 As shown, a reinforcing rib 64 is provided between the first side plate 62 and / or the second side plate 63 and the bottom plate 61; Fig.10 As shown, the reinforcing rib 64 is clamped in the first limiting groove 53; by arranging the reinforcing rib 64 between the first side plate 62 and / or the second side plate 63 and the bottom plate 61, the overall supporting strength of the convex bump 60 is enhanced, which can ensure the stability of the convex bump 60 supporting the electrode group 20 when the battery cell triggers thermal runaway; by clamping the reinforcing rib 64 with the first limiting groove 53, the convex bump 60 is limited, which facilitates the convex bump 60 to enter the shell together with the end plate 40 and the lower plastic 50 during the manufacturing process.

[0066] In some embodiments, please combine Figure 4 and Figure 7 As shown, a second limiting groove 65 is formed between the first side plate 62 and the second side plate 63; see Figure 8 As shown, ribs 54 are provided on both sides of the third direction of the raised portion 52; Figure 2 As shown, during the manufacturing process, the rib 54 is engaged in the second limiting groove 65, thereby limiting the convex bump 60, so that the convex bump 60 is convenient for entering the shell together with the end plate 40 and the lower plastic 50 during the manufacturing process.

[0067] In some embodiments, the convex bump 60 is made of an insulating, high-temperature, and electrolyte-resistant material. For example, the convex bump 60 can be made of a hard ceramic silicone rubber material or a ceramic material. By using an insulating, high-temperature, and electrolyte-resistant material, the convex bump 60 can not only protect the electrode group 20 well during the battery cell manufacturing process and normal use, avoiding abnormal bridging and short circuits inside the battery cell, but also provide stable and effective support for the electrode group 20 when the battery cell triggers thermal runaway.

[0068] 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.

[0069] 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.

[0070] 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 is arranged on a side of the pole group facing the cover plate along the first direction, and the end plate is recessed along the first direction toward the cover plate to form an avoidance groove; A lower plastic, disposed between the end plate and the cover plate, the lower plastic comprising a main body wall and a protrusion formed by the main body wall extending along a first direction toward the pole group; A convex hump is built into the avoidance groove, the convex hump is connected to the outer wall of the raised portion, and the two sides of the convex hump in the first direction 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 total height of the convex hull along the first direction is H, and H satisfies 0.5·M≤H≤3·M, wherein M satisfies N≤M≤5·N, M is the total thickness of the lower plastic along the first direction, and N is the thickness of the main body wall along the first direction.

3. The battery pole group fixing structure according to claim 1, characterized in that: The total width of the convex hull along the third direction is L, and L satisfies D≤L≤1.2·T, wherein D is the distance between two notches arranged oppositely along the third direction on the explosion-proof valve, and T is the total width of the lower plastic along the third direction.

4. The battery pole group fixing structure according to claim 3, characterized in that: The bulge includes a base plate, and a first side plate and a second side plate formed by the base plate extending along a first direction away from the base plate, wherein the first side plate is arranged on both sides of the base plate in the third direction, and the second side plate is arranged on both sides of the base plate in the second direction, the base plate is covered on one side of the raised portion along the first direction toward the pole group, and the first side plate and the second side plate are covered on the outer peripheral wall of the raised portion.

5. The battery pole group fixing structure according to claim 4, characterized in that: The thickness of the first side plate and the second side plate are both Q, and Q satisfies 0.5 mm ≤ Q ≤ 0.5·T.

6. The battery pole group fixing structure according to claim 4, characterized in that: The distance between the bottom plate and the inner bottom wall of the avoidance groove is P, and P satisfies 0≤P≤5mm.

7. The battery pole group fixing structure according to claim 4, characterized in that: A first limiting groove is formed on the protruding portion along the second direction and / or the third direction; a reinforcing rib is provided between the first side plate and / or the second side plate and the bottom plate; and the reinforcing rib is clamped in the first limiting groove.

8. The battery pole group fixing structure according to claim 4, characterized in that: A second limiting groove is formed between the first side plate and the second side plate; convex ribs are arranged on both sides of the third direction of the raised portion; and the convex ribs are clamped in the second limiting groove.

9. The battery pole group fixing structure according to any one of claims 1 to 8, characterized in that: The convex bump is made of insulating, high-temperature and electrolyte-resistant material.

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.

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