Battery cell side plate structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell side plate structure and a battery, and the battery cell side plate structure comprises a side plate body arranged between a pole group and the inner wall of a shell; wherein the inner wall of the shell is enclosed to form an accommodating cavity, and the accommodating cavity is suitable for accommodating a pole group; an anti-explosion valve is arranged on the shell, and the side plate body and the anti-explosion valve are oppositely arranged; and the damping block assembly is arranged on the side, close to the anti-explosion valve, of the side plate body in the thickness direction of the side plate body, the damping block assembly is made of an elastic material, and the side, away from the side plate body, of the damping block assembly is suitable for elastically abutting against the inner wall of the shell. The battery cell side plate structure provided by the utility model not only can protect the pole group, but also can prevent the side plate body from impacting, colliding and extruding the anti-explosion valve, so that the risk of deformation of the anti-explosion valve is avoided, and the safety of the battery cell is improved.

Description

Technical Field

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

[0002] The explosion-proof valve is an important part of the battery cell. For the battery cell with the explosion-proof valve welded to the shell, a side plate is usually added between the shell and the pole group to protect the explosion-proof valve. However, when the battery cell is vibrated by external force, the side plate will collide and squeeze the explosion-proof valve on the shell, which may cause the explosion-proof valve to deform, resulting in abnormal detonation value of the explosion-proof valve and potential safety hazards of the battery cell. Utility Model Content

[0003] In view of this, the utility model provides a battery side plate structure and a battery to solve the problem that when the battery core is vibrated by external force, the side plate will collide and squeeze the explosion-proof valve on the shell.

[0004] In a first aspect, the utility model provides a battery cell side plate structure, comprising:

[0005] The side plate body is arranged between the pole group and the inner wall of the shell;

[0006] The inner wall of the shell is enclosed to form a receiving cavity, and the receiving cavity is suitable for receiving the pole group; an explosion-proof valve is arranged on the shell, and the side plate body is arranged opposite to the explosion-proof valve;

[0007] The shock-absorbing block assembly is arranged on a side of the side plate body close to the explosion-proof valve along its own thickness direction. The shock-absorbing block assembly is made of elastic material. The side of the shock-absorbing block assembly away from the side plate body is suitable for elastically abutting against the inner wall of the shell.

[0008] Beneficial effects: The battery cell side panel structure provided by the utility model mainly includes a side panel body and a shock-absorbing block assembly. The side panel body is arranged on the side of the pole group close to the explosion-proof valve, and the shock-absorbing block assembly is arranged on the side of the side panel body close to the explosion-proof valve along its own thickness direction. The shock-absorbing block assembly has a certain elasticity, so that it elastically abuts against the inner wall of the shell. On the one hand, it can play a supporting role between the side panel body and the explosion-proof valve, so that the side panel body and the explosion-proof valve are kept at a distance, thereby avoiding the side panel body from colliding and squeezing the explosion-proof valve. On the other hand, when the battery cell collides, the shock-absorbing block assembly can achieve buffering and shock absorption through its own elastic restoring force, which can not only protect the pole group, but also avoid the impact, collision and squeezing of the side panel body on the explosion-proof valve, thereby avoiding the risk of deformation of the explosion-proof valve and improving the safety of the battery cell.

[0009] In an optional embodiment, a plurality of exhaust holes are provided on the side plate body;

[0010] The shock-absorbing block assembly includes two first shock-absorbing blocks and one or more second shock-absorbing blocks. The two first shock-absorbing blocks are arranged on the side plate body at relative intervals along the length direction. The second shock-absorbing block is arranged between the two first shock-absorbing blocks. The second shock-absorbing blocks and the first shock-absorbing blocks are elastically abutted against the inner wall of the shell, and a first gap is formed between the side plate body and the inner wall of the shell. The first gap is connected to the exhaust hole.

[0011] Beneficial effect: The second shock-absorbing block is arranged between the two first shock-absorbing blocks, so that the force on the side panel body is more uniform, avoiding excessive deformation of the side panel body, which is beneficial to ensuring the flatness and structural strength of the side panel body; the side panel body and the inner wall of the shell are spaced to form a first gap, and the first gap is connected to the exhaust hole, so as to achieve a buffering and shock-absorbing effect while forming a sufficiently large exhaust space inside the battery cell, thereby reducing the risk of explosion during thermal runaway of the battery cell.

[0012] In an optional embodiment, the first shock absorbing block and the second shock absorbing block each include a first end surface and a second end surface that are arranged opposite to each other, the first end surface is suitable for connecting with the side plate body, and the second end surface is suitable for abutting against the inner wall of the shell;

[0013] The area of ​​the second end surface is smaller than the area of ​​the first end surface.

[0014] Beneficial effect: Thus, a shock-absorbing block structure with a trapezoidal cross-section is formed, which can, on the one hand, ensure the connection strength between the first end face and the side panel body after hot melting, and on the other hand, reduce the contact area between the second end face and the inner wall of the shell, which is not only beneficial to increase the exhaust space between the side panel body and the inner wall of the shell, but also beneficial to reduce material costs.

[0015] In an optional implementation, the heights of the first shock absorbing block and the second shock absorbing block are both H, and H satisfies 0.2 mm ≤ H ≤ 0.5 mm.

[0016] Beneficial effect: It can not only ensure sufficient exhaust space to avoid the risk of contact, collision and extrusion of the explosion-proof valve by the side panel body, but also reasonably utilize the internal space of the battery cell to ensure the volume energy density of the battery cell.

[0017] In an optional embodiment, a limiting boss is formed on the side wall of the shell, and an explosion-proof hole connected to the accommodating cavity is opened on the limiting boss; at least part of the explosion-proof valve is arranged on the side of the limiting boss facing the accommodating cavity, and the explosion-proof valve closes the explosion-proof hole;

[0018] A first stepped hole is also provided on the side plate body. The first stepped hole is arranged opposite to the explosion-proof valve and is suitable for avoiding the explosion-proof valve.

[0019] Beneficial effect: By opening the first stepped hole on the side plate body to avoid the explosion-proof valve, it is ensured that the explosion-proof valve will not be squeezed by the side plate body during the impact deformation process, thereby avoiding failure of the explosion-proof valve.

[0020] In an optional embodiment, a second stepped hole is further provided on the side plate body, the second stepped hole penetrates the side plate body, and the second stepped hole is connected to the first stepped hole.

[0021] Beneficial effect: thus increasing the exhaust channel on the side panel body, which is conducive to timely exhaust when the battery cell is thermally runaway.

[0022] In an optional embodiment, the second shock absorbing block is disposed between the first shock absorbing block and the first stepped hole;

[0023] Every two adjacent second damping blocks are spaced apart in the width direction to form a second gap, and the second gap is communicated with the first stepped hole and the exhaust hole at the same time.

[0024] Beneficial effect: When the battery cell is in thermal runaway, the gas can flow smoothly between the side plate body and the inner wall of the shell, which is conducive to the timely discharge of the thermal runaway gas.

[0025] In an optional embodiment, the exhaust hole is arranged between the first shock absorbing block and the second shock absorbing block, and the first shock absorbing block and the second shock absorbing block are both arranged at intervals from the exhaust hole.

[0026] Beneficial effect: thus avoiding interference between the first shock-absorbing block and the second shock-absorbing block and the exhaust hole when hot-melting the side plate body.

[0027] In an optional embodiment, the outer wall of the electrode group is coated with an insulating sheet, and the insulating sheet is suitable for insulating the electrode group from the inner wall of the shell;

[0028] A positioning hole is opened on the side plate body; the side plate body is hot-melted through the positioning hole so that the side of the side plate body close to the pole group along its own thickness direction is closely arranged with the insulating sheet and the side plate body is positioned.

[0029] Beneficial effect: During the manufacturing process, the side of the side plate body close to the pole group along its own thickness direction can be tightly assembled with the insulating sheet by hot melting at the positioning hole, so as to position the side plate body and ensure that the side plate body will not tilt or deviate.

[0030] In a second aspect, the utility model further provides a battery, comprising: a battery body, and the battery cell side plate structure as described above.

[0031] Beneficial effects: The battery of the second aspect includes the battery cell side plate structure of the first aspect, and therefore, the battery of the second aspect includes all the beneficial effects of the battery cell side plate structure of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A three-dimensional diagram of a battery core side plate structure according to an embodiment of the utility model;

[0034] Figure 2 It is a schematic diagram of the assembly of a battery cell side plate structure, a housing and a pole group according to an embodiment of the utility model;

[0035] Figure 3 It is a cross-sectional schematic diagram of a first shock absorbing block and a second shock absorbing block of a battery core side plate structure along the length direction of an embodiment of the utility model;

[0036] Figure 4 The figure is a schematic diagram of the explosion structure of a battery according to an embodiment of the utility model.

[0037] Description of reference numerals:

[0038] 10. Side plate body; 101. First gap; 102. Second gap; 11. Exhaust hole; 12. First stepped hole; 13. Second stepped hole; 14. Positioning hole;

[0039] 20, shock absorbing block assembly; 201, first end surface; 202, second end surface; 21, first shock absorbing block; 22, second shock absorbing block;

[0040] 30. Pole group;

[0041] 40. housing; 41. limiting boss;

[0042] 50. Explosion-proof valve;

[0043] 60. Insulation sheet. DETAILED DESCRIPTION

[0044] In the battery of the related technology, when the battery cell is subjected to external force, it will vibrate, and the side panel will collide and squeeze the explosion-proof valve on the shell, which may cause the explosion-proof valve to deform, resulting in abnormal detonation value of the explosion-proof valve and potential safety hazards of the battery cell. In addition, in some application scenarios, when the battery cell is assembled at the module end, the explosion-proof valve of the shell is placed downward, and the side panel is above the explosion-proof valve. When the battery cell has thermal runaway and produces a large amount of gas, the pole group is pressed on the side panel, resulting in insufficient exhaust space, and there is a risk of explosion of the battery cell shell.

[0045] 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.

[0046] Combine the following Figures 1 to 4 , describing an embodiment of the utility model.

[0047] According to an embodiment of the present utility model, on the one hand, a battery cell side plate structure is provided, comprising:

[0048] The side plate body 10 is disposed between the pole group 30 and the inner wall of the housing 40;

[0049] Please combine Figure 2 and Figure 4 As shown, the inner wall of the housing 40 encloses a receiving cavity, and the receiving cavity is suitable for receiving the pole group 30; an explosion-proof valve 50 is arranged on the housing 40, and the side plate body 10 is arranged opposite to the explosion-proof valve 50;

[0050] The shock-absorbing block assembly 20 is fixedly arranged on one side of the side panel body 10 along its own thickness direction close to the explosion-proof valve 50. The shock-absorbing block assembly 20 is made of elastic and / or flexible material. The side of the shock-absorbing block assembly 20 away from the side panel body 10 is suitable for elastically abutting against the inner wall of the shell 40.

[0051] The battery cell side panel structure provided by the utility model mainly includes a side panel body 10 and a shock-absorbing block assembly 20. The side panel body 10 is arranged on the side of the pole group 30 close to the explosion-proof valve 50, and the shock-absorbing block assembly 20 is arranged on the side of the side panel body 10 close to the explosion-proof valve 50 along its own thickness direction. The shock-absorbing block assembly 20 has a certain elasticity, so that it elastically abuts against the inner wall of the shell 40. On the one hand, it can play a supporting role between the side panel body 10 and the explosion-proof valve 50, so that the side panel body 10 and the explosion-proof valve 50 are kept at a distance, thereby avoiding the side panel body 10 from colliding and squeezing the explosion-proof valve 50. On the other hand, when the battery cell collides, the shock-absorbing block assembly 20 can achieve buffering and shock absorption through its own elastic restoring force, which can not only protect the pole group 30, but also avoid the impact, collision and squeezing of the explosion-proof valve 50 by the side panel body 10, thereby avoiding the risk of deformation of the explosion-proof valve and improving the safety of the battery cell.

[0052] Furthermore, the shock absorbing block assembly 20 is made of a corrosion-resistant elastic and / or flexible material.

[0053] Furthermore, the shock absorbing block assembly 20 can be assembled with the side panel body 10 by hot melting.

[0054] In some embodiments, see Figure 1 As shown, a plurality of exhaust holes 11 are provided on the side plate body 10;

[0055] The shock absorbing block assembly 20 includes two first shock absorbing blocks 21 and one or more second shock absorbing blocks 22. The two first shock absorbing blocks 21 are arranged on the side panel body 10 at relative intervals along the length direction, and the second shock absorbing block 22 is arranged between the two first shock absorbing blocks 21, so that the force on the side panel body 10 is more uniform, avoiding excessive deformation of the side panel body 10, which is beneficial to ensuring the flatness and structural strength of the side panel body 10; the second shock absorbing block 22 and the first shock absorbing block 21 are elastically abutted against the inner wall of the shell 40, and the side panel body 10 and the inner wall of the shell 40 are spaced to form a first gap 101, and the first gap 101 is connected to the exhaust hole 11, so as to form a sufficiently large exhaust space inside the battery cell while achieving the buffering and shock absorbing effect, thereby reducing the risk of explosion during thermal runaway of the battery cell.

[0056] In some embodiments, please combine Figure 2 and Figure 3 As shown, the first damping block 21 and the second damping block 22 each include a first end face 201 and a second end face 202 that are arranged opposite to each other in the thickness direction, the first end face 201 is suitable for hot-melting with the side plate body 10, and the second end face 202 is suitable for abutting against the inner wall of the shell 40;

[0057] The area of ​​the second end face 202 is smaller than the area of ​​the first end face 201, thereby forming a shock-absorbing block structure with a trapezoidal cross-section. On the one hand, it can ensure the connection strength between the first end face 201 and the side panel body 10 after hot melting, and on the other hand, it can reduce the contact area between the second end face 202 and the inner wall of the shell 40. This is not only beneficial to increase the exhaust space between the side panel body 10 and the inner wall of the shell 40, but also beneficial to reduce material costs.

[0058] In some embodiments, see Figure 3 As shown, the heights of the first shock absorbing block 21 and the second shock absorbing block 22 are both H, and H satisfies 0.2 mm≤H≤0.5 mm.

[0059] It should be noted that, since the first shock-absorbing block 21 and the second shock-absorbing block 22 will undergo elastic deformation under the influence of pressure during the exhaust process, the value of H cannot be too small, otherwise it will easily cause the first gap 101 to be too small, resulting in insufficient exhaust space, and at the same time it will easily cause the risk of contact, collision and extrusion of the explosion-proof valve 50 by the side panel body 10, therefore, H must satisfy H≥0.2mm; the value of H cannot be too large, otherwise it will easily increase the space occupied and cause a decrease in the volume energy density of the battery cell, therefore, H must also satisfy H≤0.5mm.

[0060] In this embodiment, the height of the first shock-absorbing block 21 and the second shock-absorbing block 22 are both H, and H satisfies 0.2mm≤H≤0.5mm, which can not only ensure sufficient exhaust space to avoid the risk of contact, collision and extrusion of the explosion-proof valve 50 by the side panel body 10, but also reasonably utilize the internal space of the battery cell to ensure the volume energy density of the battery cell.

[0061] In some embodiments, see Figure 4 As shown, a limiting boss 41 is formed on the side wall of the shell 40, and an explosion-proof hole connected to the accommodating cavity is opened on the limiting boss 41; at least part of the explosion-proof valve 50 is arranged on the side of the limiting boss 41 facing the accommodating cavity, and the explosion-proof valve 50 closes the explosion-proof hole; in the manufacturing process, the explosion-proof valve 50 is built into the accommodating cavity of the shell 40 and welded to the shell 40;

[0062] See also Figure 1 As shown, a first stepped hole 12 is further provided on the side plate body 10 . The first stepped hole 12 is arranged opposite to the explosion-proof valve 50 . The first stepped hole 12 is suitable for avoiding the explosion-proof valve 50 .

[0063] It can be understood that the size of the first stepped hole 12 is larger than the overall size of the explosion-proof valve 50 in the accommodating cavity of the housing 40 .

[0064] In this embodiment, a first stepped hole 12 is provided on the side plate body 10 to avoid the explosion-proof valve 50 , thereby ensuring that the side plate body 10 will not squeeze the explosion-proof valve 50 during the impact deformation process, thereby avoiding failure of the explosion-proof valve 50 .

[0065] In some embodiments, see Figure 1 As shown, a second step hole 13 is also provided on the side plate body 10. The second step hole 13 penetrates the side plate body 10 and is connected to the first step hole 12, thereby increasing the exhaust channel on the side plate body 10, which is beneficial to timely exhaust when the battery cell has thermal runaway.

[0066] In some embodiments, see Figure 1 As shown, the second shock absorbing block 22 is disposed between the first shock absorbing block 21 and the first stepped hole 12;

[0067] Every two adjacent second shock-absorbing blocks 22 are spaced apart in the width direction to form a second gap 102, and the second gap 102 is connected to the first stepped hole 12 and the exhaust hole 11 at the same time, so that when the battery cell thermal runaway occurs, the gas can flow smoothly between the side plate body 10 and the inner wall of the shell 40, which is conducive to the timely discharge of the thermal runaway gas.

[0068] In some embodiments, see Figure 1 As shown, the exhaust hole 11 is arranged between the first shock-absorbing block 21 and the second shock-absorbing block 22, and the first shock-absorbing block 21 and the second shock-absorbing block 22 are spaced apart from the exhaust hole 11, thereby avoiding interference between the first shock-absorbing block 21 and the second shock-absorbing block 22 and the exhaust hole 11 when hot-melting the side panel body 10.

[0069] In some embodiments, please combine Figure 2 and Figure 4 As shown, the outer wall of the pole group 30 is covered with an insulating sheet 60, and the insulating sheet 60 is suitable for insulating the pole group 30 from the inner wall of the housing 40;

[0070] See also Figure 1 As shown, a positioning hole 14 is opened on the side plate body 10; the side plate body 10 is hot-melted through the positioning hole 14 so that the side of the side plate body 10 close to the pole group 30 along its own thickness direction is closely arranged with the insulating sheet 60 and the side plate body 10 is positioned.

[0071] In this embodiment, by opening a positioning hole 14 on the side panel body 10, during the manufacturing process, the side of the side panel body 10 close to the pole group 30 along its own thickness direction can be tightly assembled with the insulating sheet 60 by hot melting at the positioning hole 14, so as to position the side panel body 10 and ensure that the side panel body 10 will not tilt or deviate.

[0072] According to an embodiment of the present utility model, on the other hand, a battery is provided, including: a battery body, and the battery cell side plate structure as described above.

[0073] The battery in this embodiment includes the above-mentioned battery cell side plate structure, and therefore, the battery in this embodiment includes all the beneficial effects of the above-mentioned battery cell side plate structure.

[0074] 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 cell side plate structure, characterized in that: include: The side plate body is arranged between the pole group and the inner wall of the shell; The inner wall of the shell is enclosed to form a receiving cavity, and the receiving cavity is suitable for receiving the electrode group; an explosion-proof valve is arranged on the shell, and the side plate body is arranged opposite to the explosion-proof valve; The shock absorbing block assembly is arranged on a side of the side plate body close to the explosion-proof valve along its own thickness direction. The shock absorbing block assembly is made of elastic material. The side of the shock absorbing block assembly away from the side plate body is suitable for elastically abutting against the inner wall of the shell.

2. The battery core side plate structure according to claim 1, characterized in that: The side plate body is provided with a plurality of exhaust holes; The shock-absorbing block assembly includes two first shock-absorbing blocks and one or more second shock-absorbing blocks, the two first shock-absorbing blocks are arranged on the side plate body with relative spacing along the length direction, the second shock-absorbing block is arranged between the two first shock-absorbing blocks, the second shock-absorbing block and the first shock-absorbing block are elastically abutted against the inner wall of the shell, and the side plate body and the inner wall of the shell are separated to form a first gap, and the first gap is connected to the exhaust hole.

3. The battery core side plate structure according to claim 2, characterized in that: The first shock absorbing block and the second shock absorbing block each include a first end surface and a second end surface that are arranged opposite to each other, the first end surface is suitable for connecting with the side plate body, and the second end surface is suitable for abutting against the inner wall of the shell; An area of ​​the second end surface is smaller than an area of ​​the first end surface.

4. The battery cell side plate structure according to claim 2, characterized in that: The heights of the first shock absorbing block and the second shock absorbing block are both H, and H satisfies 0.2 mm≤H≤0.5 mm.

5. The battery core side plate structure according to claim 2, characterized in that: A limiting boss is formed on the side wall of the shell, and an explosion-proof hole communicating with the accommodating cavity is formed on the limiting boss; at least part of the explosion-proof valve is arranged on a side of the limiting boss facing the accommodating cavity, and the explosion-proof valve closes the explosion-proof hole; The side plate body is also provided with a first stepped hole, the first stepped hole is arranged opposite to the explosion-proof valve, and the first stepped hole is suitable for avoiding the explosion-proof valve.

6. The battery cell side plate structure according to claim 5, characterized in that: The side plate body is also provided with a second stepped hole, the second stepped hole passes through the side plate body, and the second stepped hole is communicated with the first stepped hole.

7. The battery cell side plate structure according to claim 5, characterized in that: The second shock absorbing block is arranged between the first shock absorbing block and the first stepped hole; Every two adjacent second damping blocks are spaced apart in the width direction to form a second gap, and the second gap is communicated with the first stepped hole and the exhaust hole at the same time.

8. The battery cell side plate structure according to claim 7, characterized in that: The exhaust hole is arranged between the first shock absorbing block and the second shock absorbing block, and the first shock absorbing block and the second shock absorbing block are both arranged at intervals from the exhaust hole.

9. The battery core side plate structure according to any one of claims 1 to 8, characterized in that: The outer wall of the pole group is covered with an insulating sheet, and the insulating sheet is suitable for insulating the pole group from the inner wall of the shell; A positioning hole is provided on the side plate body; the side plate body is hot-melted through the positioning hole so that the side plate body close to the pole group along its own thickness direction is closely arranged with the insulating sheet and the side plate body is positioned.

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

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