Battery pole group fixing structure and battery

Abstract

The utility model relates to the technical field of power batteries, and provides a battery pole group fixing structure and a battery, the battery pole group fixing structure comprises an insulating film, the inner side peripheral wall 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 insulating film, and an anti-explosion valve is arranged on the cover plate; the end plate is arranged on the side, facing the cover plate in the first direction, of the pole group, and an avoiding space is formed between the side, in the second direction, of the end plate and the insulating film; the stop block is connected with the insulating film and arranged in the avoiding space, the stop block is resistant to high temperature and electrolyte, and the stop block is suitable for being connected between the cover plate and the pole group in an abutting mode under the condition that the end plate is melted due to thermal runaway of the battery so as to prevent the pole group from moving towards the anti-explosion valve in the first direction, and an exhaust channel communicated with the anti-explosion valve is formed between the cover plate and the pole group. The arrangement can effectively prevent the pole group from moving towards the explosion-proof valve side to shield the explosion-proof valve and affect battery exhaust and heat dissipation, the exhaust and heat dissipation effect of the explosion-proof valve is effectively improved, and the safety performance of the battery is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a battery pole group fixing structure and a battery. Background Art

[0002] At present, the insulation protection structure of the electrode group 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, and 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℃ in a short period of time, and the internal plastic materials such as the end plate 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 cover plate is 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. Summary of the invention

[0003] In view of this, the utility model provides a battery pole group fixing structure and a battery to solve the existing problem that when thermal runaway occurs in the battery, the pole group may block the explosion-proof valve under the impact of airflow, aggravating the battery runaway and posing a greater safety risk.

[0004] In the first aspect, the utility model provides a battery pole group fixing structure, comprising: an insulating film, the inner peripheral wall of which is surrounded by a accommodating cavity, and the accommodating cavity is suitable for accommodating the pole group; a cover plate, which is arranged on one side of the insulating film along a first direction, and an explosion-proof valve is arranged on the cover plate; an end plate, which is arranged on the side of the pole group facing the cover plate along the first direction, and an escape space is arranged between the end plate and the insulating film on one side along a second direction; a stop block, which is connected to the insulating film and is arranged in the escape space, the stop block is resistant to high temperature and electrolyte, and is suitable for abutting between the cover plate and the pole group when the end plate melts due to thermal runaway of the battery, so as to prevent the pole group from moving toward the explosion-proof valve along the first direction, and to form an exhaust channel connected to the explosion-proof valve between the cover plate and the pole group.

[0005] Beneficial effects:

[0006] By adding a stop block between the cover plate and the electrode group, when the battery cell thermally runs away and the end plate and the lower plastic melt, the stop block connected to the insulating film is set between the cover plate and the electrode group, so that an exhaust channel connected to the explosion-proof valve is formed between the cover plate and the electrode group, which can effectively prevent the electrode group from moving toward the explosion-proof valve and blocking the explosion-proof valve, affecting the exhaust and heat dissipation of the battery, effectively improving the exhaust and heat dissipation effect of the explosion-proof valve, and effectively improving the safety performance of the battery.

[0007] In an optional embodiment, the stop block is arranged in a single block or in multiple blocks in a staggered manner along the third direction, and the total thickness along the third direction is W, W satisfies 0.5B≤W≤B, wherein B is the thickness of the pole group along the third direction.

[0008] In an optional embodiment, a single stop block is provided along the third direction and is provided on one side of the explosion-proof valve along the second direction. The stop block is spaced apart from the insulating film along the second direction, and the spacing is S, S satisfies S≥5mm.

[0009] In an optional embodiment, a plurality of stop blocks are arranged side by side along the third direction, and a total thickness of the stop blocks along the third direction is W, and W satisfies W≤0.5B, wherein B is the thickness of the pole group along the third direction.

[0010] In an optional embodiment, a plurality of stop blocks are provided along the third direction and are disposed on both sides of the explosion-proof valve along the second direction.

[0011] In an optional embodiment, the length of the stop block along the second direction is L, L satisfies L≥0.5B, and / or, L≥5 mm.

[0012] In an optional embodiment, a height of the end plate along the first direction is C, 4mm≤C≤10mm.

[0013] In an optional embodiment, the stop block and the insulating film are separately provided and are bonded or hot-melt connected to each other.

[0014] In an optional implementation, the stop block is integrally formed with the insulating film.

[0015] In a second aspect, the utility model further provides a battery, comprising: a housing, an electrode group and the above-mentioned battery electrode group fixing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 An exploded view of a battery electrode group fixing structure according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A schematic top view of a battery pole group fixing structure shown;

[0019] Figure 3 for Figure 2 A schematic cross-sectional view of the fixing structure of the middle battery electrode group in the AA direction;

[0020] Figure 4 for Figure 1 A schematic diagram of the three-dimensional structure of the battery electrode group fixing structure;

[0021] Description of reference numerals:

[0022] 1. Insulating film; 2. Pole group; 3. Cover plate; 4. Explosion-proof valve; 5. End plate; 6. Avoidance space; 7. Stop block. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] In the related art, the insulation protection structure of the electrode group 2 inside the battery cell is made of plastic materials such as PP, which can well protect the electrode group 2 during the battery cell manufacturing process and normal use, and avoid abnormal bridging 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 end plate 5 will quickly melt and fail. At this time, there is only the electrode group 2 inside the shell. Under the action of the internal high-temperature and high-pressure gas, the electrode group 2 loses balance. Because the pressure at the explosion-proof valve 4 of the cover plate 3 is relatively low, the electrode group 2 can easily move toward the explosion-proof valve 4, thereby blocking the explosion-proof valve 4, causing the battery to fail to release pressure in time and catch fire and explode.

[0025] In order to alleviate the above technical problems, such as Figure 1-Figure 4 This embodiment provides a battery pole group fixing structure, including: an insulating film 1, a cover plate 3, an end plate 5 and a stop block 7.

[0026] The surrounding wall on the inner side of the insulating film 1 encloses a accommodating cavity, which is suitable for accommodating the pole group 2. The cover plate 3 is arranged on one side of the insulating film 1 along the first direction, and an explosion-proof valve 4 is arranged on the cover plate 3; the end plate 5 is arranged on the side of the pole group 2 facing the cover plate 3 along the first direction, and an escape space 6 is arranged between the end plate 5 and the insulating film 1 on one side along the second direction. The stop block 7 is connected to the insulating film 1 and is arranged in the escape space 6. The stop block 7 is resistant to high temperature and electrolyte. The stop block 7 is suitable for abutting between the cover plate 3 and the pole group 2 when the end plate 5 melts due to thermal runaway of the battery, so as to prevent the pole group 2 from moving toward the explosion-proof valve 4 along the first direction, and to form an exhaust channel connected to the explosion-proof valve 4 between the cover plate 3 and the pole group 2.

[0027] Specifically, in this embodiment, the insulating film 1 is preferably made of PP material, and the cover plate 3 is specifically a plain aluminum plate. In some embodiments, the insulating film 1 may also be made of PE or PET. In addition, in some embodiments, part of the end plate 5 may be arranged on the side of the avoidance space 6 facing the pole group 2 to prevent the stopper 7 from scratching the pole group 2. The stopper 7 may be made of an insulating material containing aluminum oxide, such as a hard ceramic composite material. In some embodiments, the stopper 7 may be made of the same material as the insulating film 1. Furthermore, an auxiliary exhaust structure of an air guide groove or an air guide hole may be provided on the stopper 7.

[0028] By adding a stop block 7 between the cover plate 3 and the stage group, when the battery cell thermally runs away and the end plate 5 and the lower plastic are melted, the stop block 7 connected to the insulating film 1 is set between the cover plate 3 and the stage group, so that an exhaust channel connected to the explosion-proof valve 4 is formed between the cover plate 3 and the pole group 2, which can effectively prevent the pole group 2 from moving toward the explosion-proof valve 4 and blocking the explosion-proof valve 4, affecting the exhaust and heat dissipation of the battery, effectively improving the exhaust and heat dissipation effect of the explosion-proof valve 4, and effectively improving the safety performance of the battery.

[0029] In some embodiments, the stopper block 7 is arranged in a single block or multiple blocks are staggered along the third direction, and the total thickness along the third direction is W, W satisfies 0.5B≤W≤B, where B is the thickness of the pole group 2 along the third direction. Specifically, the staggered arrangement means that the multiple stopper blocks 7 are not arranged from the third direction. In addition, the number of multiple blocks refers to two or more.

[0030] When the stop block 7 is a single block along the third direction, or is offset and thus regarded as a single block in the third direction, it is necessary to avoid the stop block 7 being larger than the thickness of the pole group 2, which causes bulging when the bare cell insulation film 1 is wrapped in the area, making it impossible for the bare cell insulation film 1 to wrap the cell. This avoids possible short circuits caused by the ear touching the shell, or problems such as the bare cell interfering with the shell and being unable to be assembled during assembly. At the same time, W≥0.5B is set to ensure that the stop block 7 has sufficient volume and structural strength to form an exhaust channel when the cell thermally runs away, thereby preventing the pole group 2 from moving toward the explosion-proof valve 4 and blocking the explosion-proof valve 4.

[0031] When a single stop block 7 is provided along the third direction, or multiple stop blocks are staggered along the third direction, the stop block 7 can be provided on one side of the explosion-proof valve 4 along the second direction. Preferably, the stop block 7 is provided on the side closer to the explosion-proof valve 4. In this case, the stop block 7 is connected to the insulating film 1 along the third direction, and is spaced apart from the insulating film 1 along the second direction, and the spacing is S, and S satisfies S≥5mm. This arrangement ensures that the stop block 7 is prevented from being too close to the edge to affect assembly, and ensures that the bare cell insulating film 1 effectively wraps the stage group.

[0032] In some other embodiments, a plurality of stop blocks 7 are arranged side by side along the third direction, and the total thickness of the stop blocks 7 along the third direction is W, W satisfies W≤0.5B, and B is the thickness of the electrode group 2 along the third direction. The stop blocks 7 are arranged side by side along the third direction, and the requirements for the thickness of the stop blocks 7 can be reduced to save costs while ensuring that an exhaust channel is formed and the electrode group 2 is prevented from moving toward the explosion-proof valve 4 and blocking the explosion-proof valve 4.

[0033] When multiple stop blocks 7 are arranged side by side along the third direction, the multiple stop blocks 7 are arranged on both sides of the explosion-proof valve 4 along the second direction. Preferably, the specific number of stop blocks 7 arranged on both sides can be adaptively arranged according to the position of the explosion-proof valve 4 on the cover plate 3. In some embodiments, the multiple stop blocks 7 are evenly arranged on both sides of the explosion-proof valve 4 along the second direction. Such arrangement realizes the support of the electrode group 2 and the cover plate 3 in different directions, thereby improving the safety performance of the battery.

[0034] In some embodiments, the length of the stopper 7 along the second direction is L, and L satisfies L≥0.5B and L≥5mm. This configuration, combined with the thickness of the stopper 7 in the third direction, ensures that the side of the stopper 7 facing the electrode group 2 has a sufficiently large area to disperse the force and avoid embedding into the electrode group 2. As a convertible embodiment, L may also only satisfy L≥0.5B or L≥5mm.

[0035] In some embodiments, the height of the end plate 5 along the first direction is C, 4mm≤C≤10mm. By limiting the height of the end plate 5 along the first direction, the spacing between the cover plate 3 and the electrode group 2 can be adjusted to avoid the spacing being too small so that the electrode ear is difficult to bend, and to avoid the spacing being too large to affect the battery volume energy density.

[0036] In this embodiment, the stop block 7 and the insulating film 1 are separately provided and are bonded or hot-melt connected to each other. The bonding connection can be specifically bonded by a high temperature and electrolyte resistant tape or bonding medium, and the bonding medium can be a high temperature resistant silicone composite adhesive. This arrangement can reduce the difficulty of production and save costs. In another optional embodiment, the stop block 7 can be integrally formed with the insulating film 1, and the materials of the two are the same, and can be a high temperature resistant plastic material.

[0037] In a second aspect, the utility model further provides a battery, comprising: a housing, an electrode group 2 and the above-mentioned battery electrode group fixing structure.

[0038] Although the embodiments of the present invention have been 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: An insulating film (1) has an inner peripheral wall enclosing a receiving cavity, wherein the receiving cavity is suitable for receiving a pole group (2); A cover plate (3) is arranged on one side of the insulating film (1) along the first direction, and an explosion-proof valve (4) is arranged on the cover plate (3); An end plate (5) is arranged on a side of the electrode group (2) facing the cover plate (3) along a first direction, and an escape space (6) is arranged between a side of the end plate (5) along a second direction and the insulating film (1); A stop block (7) is connected to the insulating film (1) and is arranged in the avoidance space (6). The stop block (7) is resistant to high temperatures and electrolytes. The stop block (7) is suitable for abutting between the cover plate (3) and the electrode group (2) when the end plate (5) melts due to thermal runaway of the battery, so as to prevent the electrode group (2) from moving toward the explosion-proof valve (4) along a first direction, and to form an exhaust channel between the cover plate (3) and the electrode group (2) that is connected to the explosion-proof valve (4).

2. The battery pole group fixing structure according to claim 1, characterized in that: The stop block (7) is arranged in a single block or in multiple blocks in a staggered manner along the third direction, and the total thickness along the third direction is W, W satisfies 0.5B≤W≤B, wherein B is the thickness of the pole group (2) along the third direction.

3. The battery pole group fixing structure according to claim 2, characterized in that: The stop block (7) is arranged on one side of the explosion-proof valve (4) along the second direction, and the stop block (7) is spaced apart from the insulating film (1) along the second direction, and the spacing is S, and S satisfies S≥5mm.

4. The battery pole group fixing structure according to claim 1, characterized in that: A plurality of stop blocks (7) are arranged side by side along the third direction, and the total thickness of the stop blocks (7) along the third direction is W, where W satisfies W≤0.5B, wherein B is the thickness of the pole group (2) along the third direction.

5. The battery pole group fixing structure according to claim 4, characterized in that: The plurality of stop blocks (7) are disposed on both sides of the explosion-proof valve (4) along the second direction.

6. The battery pole group fixing structure according to claim 2 or 3, characterized in that: The length of the stop block (7) along the second direction is L, and L satisfies L≥0.5B and / or L≥5mm.

7. The battery pole group fixing structure according to any one of claims 1 to 5, characterized in that: The height of the end plate (5) along the first direction is C, 4mm≤C≤10mm.

8. The battery pole group fixing structure according to any one of claims 1 to 5, characterized in that: The stop block (7) and the insulating film (1) are arranged separately and are bonded or hot-melt connected to each other.

9. The battery pole group fixing structure according to any one of claims 1 to 5, characterized in that: The stop block (7) and the insulating film (1) are integrally formed.

10. A battery, characterized in that: include: A housing and a pole group (2) and a battery pole group fixing structure as claimed in any one of claims 1 to 9.

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