Battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery which comprises a shell, at least two battery cells and a first stop block, an accommodating cavity is formed in the shell; the at least two battery cells are positioned in the accommodating cavity and are sequentially arranged at intervals along a first direction; the battery cell comprises a straight part and R-angle areas positioned on two sides of the straight part; an accommodating space is formed between the R-angle areas of the two battery cells; the first stop block is arranged in the accommodating space, and a first gap is formed between the straight parts of two adjacent battery cells; in the second direction, the length of the first stop block is smaller than that of the battery cell; the first direction is perpendicular to the second direction, so that two adjacent battery cells are isolated, the direct contact between the two adjacent battery cells is avoided, a space is provided for the expansion of the battery cells, and the battery cells have a certain extension space in the expansion process; the acting force applied to the shell in the expansion process of the battery cell is reduced, and the stability of the shell structure is ensured.

Description

Technical Field

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

[0002] As new energy technologies advance, battery designs continue to evolve. However, during use, the battery cell expands, causing the battery casing to deform, leading to a sharp drop in battery cycle capacity. Utility Model Content

[0003] In view of this, the present invention provides a battery to solve the problem that the battery cell will expand and the battery shell will deform accordingly, causing the battery module or system structure to break and be damaged; and when the strength of the system structure or the battery shell is large enough, the battery will cause the cycle capacity to drop sharply due to its own excessive expansion force.

[0004] The utility model provides a battery, comprising a shell, at least two battery cells and a first stopper; a housing cavity is provided inside the shell; at least two battery cells are located in the housing cavity and are arranged in sequence along a first direction; the battery cell comprises a straight portion and R-angled areas on both sides of the straight portion; an accommodation space is formed between the R-angled areas of the two battery cells; the first stopper is arranged in the accommodation space and forms a first gap between the straight portions of two adjacent battery cells; and in the second direction, the length of the first stopper is less than the length of the battery cell; the first direction is arranged perpendicular to the second direction.

[0005] Beneficial effect: Since the length of the first stopper is smaller than the length of the battery cell in the second direction, the first stopper and the first gap can both isolate the two adjacent battery cells, thus avoiding direct contact between the two adjacent battery cells, and provide space for the expansion of the battery cells, so that the battery cells have a certain amount of stretching space during the expansion process; and since the first gap is provided between the two adjacent battery cells, the force applied by the battery cells to the shell during the expansion process is reduced, thereby ensuring the stability of the shell structure.

[0006] In an optional embodiment, two first stoppers are respectively provided at both ends of the first gap along the second direction.

[0007] Beneficial effect: Since the two first stoppers are respectively arranged at the two ends of the first gap along the second direction, expansion space is reserved for the battery cell while ensuring the stability of the battery cell during installation and use.

[0008] In an optional embodiment, the first stopper is provided with two first arcuate surfaces on both sides along the first direction, and the two first arcuate surfaces are respectively abutted with the R-angle areas of the two adjacent battery cells located in the first gap; along the second direction, the first stopper has a first end portion at one end close to the first gap; the size of the first end portion in the first direction is equal to the size of the first gap in the first direction.

[0009] Beneficial effects: By setting the first curved surface, the close contact between the first stopper and the battery cell is ensured, which can reduce friction during direct contact, reduce irregularities and stress concentration at the contact point, reduce wear on the first stopper and the battery cell, and improve the service life of the battery cell and the first stopper; when the battery vibrates during movement or use, it can avoid shaking or offsetting the battery cell inside the shell, thereby enhancing the stability of the battery cell; and because the size of the first end in the first direction is equal to the size of the first gap in the first direction, after the battery cell and the first stopper are installed, due to the action of the first stopper, it can be ensured that a certain distance is always maintained between the two battery cells, thereby forming a first gap.

[0010] In an optional embodiment, in the second direction, the first end of the first stopper is flush with the first surface of the battery cell; wherein the first surface is a surface formed by the contact between the straight portion and the R-angle region of the battery cell in the second direction.

[0011] Beneficial effect: Since the first end of the first stopper is flush with the first surface of the battery cell, the formation of the first gap is achieved while ensuring the maximization of material cost-effectiveness, and the balance between gap control and economy is achieved in structure. The contact area between the first stopper and the battery cell is minimized, and the expansion space and heat dissipation area of ​​the battery cell are increased.

[0012] In an optional embodiment, in the second direction, the first end portion of the first stopper extends into the first gap.

[0013] Beneficial effect: Since the first end portion of the first stopper extends into the first gap, deformation of the first gap due to external factors such as vibration is prevented, thereby enhancing the structural stability of the first gap.

[0014] In an optional embodiment, a second gap is provided between both ends of the battery cell along the second direction and the side wall of the accommodating cavity; the battery also includes a second block, which is located in the second gap; and the second block abuts against the shell on one side along the second direction, and is connected to the first block on the other side and abuts against the battery cell.

[0015] Beneficial effect: By setting the second stopper, a support structure is provided for the side of the battery cell, which enhances the anti-extrusion ability of the shell and the structural strength of the shell side, which can not only avoid the extrusion of the shell due to the expansion of the battery cell, but also avoid the deformation of the battery due to external impact.

[0016] In an optional embodiment, a second curved surface is provided on the second stopper, the second curved surface is arranged on a side close to the battery cell, and the second curved surface is smoothly transitioned to the first curved surface of the first stopper connected to the second stopper; the second curved surface cooperates and abuts against the R-angle area of ​​the battery cell located in the second gap.

[0017] Beneficial effects: By setting the second curved surface, the close contact between the second stopper and the battery cell is ensured, which can reduce friction during direct contact, reduce irregularities and stress concentration at the contact point, reduce wear on the second stopper and the battery cell, and improve the service life of the battery cell and the second stopper; when the battery vibrates during movement or use, it can prevent the battery cell from shaking or deflecting inside the shell, thereby enhancing the stability of the battery cell.

[0018] In an optional embodiment, the first stopper and the second stopper connected to the first stopper are fixedly connected to form a limiter, and the connection between the first stopper and the second stopper has a smooth transition.

[0019] Beneficial effect: By fixedly connecting the first stopper and the second stopper to form a limiter, it is possible to prevent the first stopper from shaking or shifting in the first gap, and to prevent the second stopper from shaking or shifting in the second gap, thereby enhancing the overall installation stability and reliability of use of the first stopper and the second stopper; and since the connection between the first stopper and the second stopper has a smooth transition, the connection between the first stopper and the second stopper can be prevented from causing damage to the battery cell, further ensuring the tightness of the connection between the limiter and the battery cell.

[0020] In an optional embodiment, the limiting member is adhesively connected to the battery core.

[0021] Beneficial effect: By gluing the limiter and the battery cell together, not only is a close fit between the limiter and the battery cell ensured, but the firmness and durability of the connection are also greatly enhanced. During the installation process, the positions of the two adjacent battery cells can be fixed, ensuring that the expansion gap between the two adjacent battery cells can be directly retained during the installation process.

[0022] In an optional embodiment, in the first direction, a size of the first gap is between 0.5% and 5% of the thickness of each of the battery cells.

[0023] Beneficial effect: By limiting the thickness range of the first gap to between 0.5% and 5% of the thickness of the battery cell, the damage to the battery cell performance caused by the excessive thickness of the first gap is effectively prevented, thereby ensuring the stability of the battery performance; and ensuring that the thickness of the first gap is not too small, thereby reserving sufficient expansion space to cope with the normal expansion phenomenon that may occur in the battery cell during use, avoiding the problem of insufficient space in the first gap, and extending the service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in related technologies, the following briefly introduces the drawings required for use in the specific implementation methods or related technical descriptions. 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 any creative work.

[0025] Figure 1 This is a schematic structural diagram of a battery according to an embodiment of the present utility model;

[0026] Figure 2 A top view of a battery according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the exploded structure of the battery cell and the limiting member according to an embodiment of the utility model;

[0028] Figure 4 Schematic diagram of the structure of a conventional square shell battery.

[0029] Description of reference numerals:

[0030] 1. Shell; 11. Accommodation cavity; 2. Battery cell; 21. R-angle area; 22. Straight portion; 23. Accommodation space; 3. First gap; 4. First stopper; 5. Second stopper; 6. Limiting member. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions 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 embodiments described 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 making creative efforts shall fall within the scope of protection of the present invention.

[0032] like Figure 4The internal structure of a conventional square-shell battery is shown. The shell 1 primarily contains several battery cells 2. Before insertion, there is a gap between the battery cells 2 and the shell 1. However, after the battery is manufactured, the gap between the battery cells 2 and the shell 1 is filled with expanded cells 2. As the battery is recycled, the battery cells 2 continue to expand, and the shell 1 is easily squeezed, deformed, or even fractured. High-strength steel plates are used to reinforce the two main planes of the shell 1 along the first direction, significantly enhancing the rigidity of the shell 1 and effectively resisting the risk of squeezing and deformation caused by battery expansion. However, according to experimental data, under extreme battery expansion, while the steel plates can withstand strong squeezing forces exceeding 15,000 Newtons without deforming the shell 1, the enormous expansion force generated within the battery has nowhere to be released and instead acts directly on the battery itself, accelerating the deterioration of the battery's internal structure, causing a sharp drop in battery capacity and shortening its service life. Furthermore, the battery's sides along the second direction are particularly fragile due to the lack of corresponding support structures. They are prone to denting when subjected to external forces, further exacerbating the decline in battery performance.

[0033] The following combination Figures 1 to 3 , describing the embodiments of the present utility model.

[0034] According to an embodiment of the present utility model, a battery is provided, comprising a shell 1, at least two battery cells 2 and a first stopper 4; a housing cavity 11 is provided inside the shell 1; at least two battery cells 2 are located in the housing cavity 11 and are arranged in sequence along a first direction; the battery cell 2 includes a straight portion 22 and R-angle regions 21 located on both sides of the straight portion 22; an accommodation space 23 is formed between the R-angle regions 21 of the two battery cells 2; the first stopper 4 is arranged in the accommodation space 23, and a first gap 3 is formed between the straight portions 22 of two adjacent battery cells 2; and in the second direction, the length of the first stopper 4 is less than the length of the battery cell 2; the first direction is arranged perpendicular to the second direction.

[0035] Since the length of the first stopper 4 is smaller than the length of the battery cell 2 in the second direction, the first stopper 4 and the first gap 3 can both isolate the two adjacent battery cells 2 and avoid direct contact between the two adjacent battery cells 2, and provide space for the expansion of the battery cell 2, so that the battery cell 2 has a certain amount of expansion space during the expansion process; and since the first gap 3 is arranged between the two adjacent battery cells 2, the force applied by the battery cell 2 to the shell 1 during the expansion process is reduced, thereby ensuring the stability of the shell 1 structure.

[0036] In a specific embodiment, the first stopper 4 can be made of hard plastic or rigid insulating material, etc., which can not only ensure the structural strength of the first stopper 4 and prevent the first stopper 4 from being deformed under the extrusion of the battery cell 2; but also prevent the first stopper 4 from being corroded by the electrolyte, thereby increasing the service life of the first stopper 4.

[0037] In a specific embodiment, the first direction is the thickness direction of the battery cell 2 , and the second direction is the length direction of the battery cell 2 .

[0038] In a specific embodiment, two battery cells 2 are provided, and the two battery cells 2 are sequentially spaced apart along the first direction, and the first gap 3 is provided between the two battery cells 2 .

[0039] In an alternative embodiment, three battery cells 2 may be provided, and the three battery cells 2 are sequentially spaced apart along the first direction, with a first gap 3 being provided between every two adjacent battery cells 2 .

[0040] In one embodiment, two first stoppers 4 are respectively provided at both ends of the first gap 3 along the second direction.

[0041] Since the two first stoppers 4 are respectively arranged at the two ends of the first gap 3 along the second direction, expansion space is reserved for the battery cell 2 while ensuring the stability of the battery cell 2 during installation and use.

[0042] In one embodiment, the first stopper 4 is provided with two first arcuate surfaces on both sides along the first direction, and the two first arcuate surfaces are respectively abutted and matched with the R-angle areas 21 of the two adjacent battery cells 2 located in the first gap 3; along the second direction, the first stopper 4 has a first end portion at one end close to the first gap 3; the size of the first end portion in the first direction is equal to the size of the first gap 3 in the first direction.

[0043] By setting the first curved surface, the close contact between the first stopper 4 and the battery cell 2 is ensured, which can reduce friction during direct contact, reduce irregularities and stress concentration at the contact point, reduce wear on the first stopper 4 and the battery cell 2, and improve the service life of the battery cell 2 and the first stopper 4; when the battery vibrates during movement or use, the battery cell 2 can be prevented from shaking or deflecting inside the shell 1, thereby enhancing the stability of the battery cell 2; and because the size of the first end in the first direction is equal to the size of the first gap 3 in the first direction, after the battery cell 2 and the first stopper 4 are installed, due to the action of the first stopper 4, it can be ensured that a certain distance is always maintained between the two battery cells 2, thereby forming the first gap 3.

[0044] In one embodiment, in the second direction, the first end of the first stopper 4 is flush with the first surface of the battery cell 2; wherein the first surface is a surface formed by the contact between the straight portion 22 and the R-angle region 21 of the battery cell 2 in the second direction.

[0045] Since the first end of the first stopper 4 is flush with the first surface of the battery cell 2, the first gap 3 is formed while ensuring maximum material cost-effectiveness, thereby achieving a balance between gap control and economy in structure, and minimizing the contact area between the first stopper 4 and the battery cell 2, thereby increasing the expansion space and heat dissipation area of ​​the battery cell 2.

[0046] In one embodiment, in the second direction, the first end portion of the first stopper 4 extends into the first gap 3 .

[0047] Since the first end portion of the first stopper 4 extends into the first gap 3 , deformation of the first gap 3 due to external factors such as vibration is prevented, thereby enhancing the structural stability of the first gap 3 .

[0048] In one embodiment, a second gap is provided between both ends of the battery cell 2 along the second direction and the side walls of the accommodating cavity 11; the battery also includes a second stopper 5, which is located in the second gap; and the second stopper 5 abuts against the shell 1 on one side along the second direction, and is connected to the first stopper 4 on the other side and abuts against the battery cell 2.

[0049] By setting the second stopper 5, a support structure is provided for the side of the battery cell 2, thereby enhancing the anti-extrusion ability of the shell 1 and the structural strength of the side of the shell 1, which can not only avoid the extrusion of the shell due to the expansion of the battery cell 2, but also avoid the deformation of the battery due to external impact.

[0050] In a specific embodiment, the second stopper 5 can be made of hard plastic or rigid insulating material, etc., which can not only ensure the structural strength of the second stopper 5 and prevent the second stopper 5 from being deformed under the extrusion of the battery cell 2; but also prevent the second stopper 5 from being corroded by the electrolyte, thereby increasing the service life of the second stopper 5.

[0051] In a specific embodiment, the battery core 2 is in close contact with the side surface of the housing 1 in the first direction, so that the overall structure of the battery is more compact and the volume of the battery can be reduced.

[0052] As another implementation of this embodiment, a third gap may be provided between the battery cell 2 and the side surface of the housing 1 in the first direction. The third gap may be filled with an elastic buffer. This not only provides further expansion space for the battery cell 2, but also absorbs the impact force of the battery cell 2 on the housing 1 during expansion, thereby reducing damage to the battery cell 2 and the housing 1 and extending the service life of the battery. Specifically, the elastic buffer may be a wavy spring, a spring, or a buffer pad.

[0053] In one embodiment, a second curved surface is provided on the second stopper 5, and the second curved surface is arranged on a side close to the battery core 2, and the second curved surface is smoothly transitioned to the first curved surface of the first stopper 4 connected to the second stopper 5; the second curved surface cooperates and abuts against the R-angle area 21 of the battery core 2 located in the second gap.

[0054] By setting the second curved surface, the second stopper 5 and the battery cell 2 are in close contact, which can reduce friction during direct contact, reduce irregularities and stress concentration at the contact point, reduce wear on the second stopper 5 and the battery cell 2, and improve the service life of the battery cell 2 and the second stopper 5; when the battery vibrates during movement or use, it can prevent the battery cell 2 from shaking or deflecting inside the shell 1, thereby enhancing the stability of the battery cell 2.

[0055] In one embodiment, the first stopper 4 and the second stopper 5 connected to the first stopper 4 are fixedly connected to form a limiter 6, and the connection between the first stopper 4 and the second stopper 5 is smoothly transitioned.

[0056] By fixedly connecting the first stop block 4 and the second stop block 5 to form a limiter 6, it is possible to prevent the first stop block 4 from shaking or shifting in the first gap 3 and the second stop block 5 from shaking or shifting in the second gap, thereby enhancing the overall installation stability and reliability of the first stop block 4 and the second stop block 5; and since the connection between the first stop block 4 and the second stop block 5 has a smooth transition, the connection between the first stop block 4 and the second stop block 5 can be prevented from causing damage to the battery cell 2, further ensuring the tightness of the connection between the limiter 6 and the battery cell 2.

[0057] In a specific embodiment, the first stopper 4 and the second stopper 5 can be integrally formed or separately formed.

[0058] In a specific embodiment, the limiting member 6 has thermal conductivity, which can improve the thermal conductivity of the battery.

[0059] Specifically, the limiting member 6 can be made of aluminum or other heat-conductive materials that do not react with the electrolyte.

[0060] In one embodiment, the limiting member 6 is adhesively connected to the battery core 2 .

[0061] By gluing the limiter 6 and the battery cell 2 together, not only is a close fit between the limiter 6 and the battery cell 2 ensured, but the firmness and durability of the connection are also greatly enhanced. During the installation process, the positions of the two adjacent battery cells 2 can be fixed, ensuring that the expansion gap between the two adjacent battery cells 2 can be directly retained during the installation process.

[0062] In one embodiment, the limiting member 6 is adhesively connected to the housing 1 .

[0063] By bonding the limiter 6 to the shell 1, not only is a close fit between the limiter 6 and the shell 1 ensured, but the firmness and durability of the connection are also greatly enhanced. After the limiter 6 is bonded to the shell 1, a fixed position for the battery cell 2 and an expansion gap between two adjacent battery cells 2 are directly reserved, thereby avoiding mutual collision between the two adjacent battery cells 2 during installation.

[0064] In one embodiment, in the first direction, the size of the first gap 3 is between 0.5% and 5% of the thickness of each of the battery cells 2 .

[0065] By limiting the thickness range of the first gap 3 to between 0.5% and 5% of the thickness of the battery cell 2, the performance of the battery cell 2 that may be damaged due to the excessive thickness of the first gap 3 is effectively prevented, thereby ensuring the stability of the battery performance; and ensuring that the thickness of the first gap 3 is not too small, thereby reserving sufficient expansion space to cope with the normal expansion phenomenon that may occur in the battery cell 2 during use, avoiding the problem of insufficient space in the first gap 3, and extending the service life of the battery cell 2.

[0066] Although the embodiments of the present invention have been described with reference to 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 shall fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: A housing (1) is provided with a receiving chamber (11) therein; At least two battery cells (2) are located in the accommodating cavity (11) and are sequentially spaced apart along a first direction; The battery core (2) comprises a straight portion (22) and R-angle regions (21) located on both sides of the straight portion (22); An accommodating space (23) is formed between the R-angle regions (21) of the two battery cells (2); A first stopper (4) is arranged in the accommodating space (23) and forms a first gap (3) between the straight portions (22) of two adjacent battery cells (2); and in the second direction, the length of the first stopper (4) is smaller than the length of the battery cell (2); and the first direction is arranged perpendicular to the second direction.

2. The battery according to claim 1, characterized in that Two first stoppers (4) are respectively provided at both ends of the first gap (3) along the second direction.

3. The battery according to claim 2, characterized in that The first stopper (4) is provided with two first arcuate surfaces on both sides along the first direction, and the two first arcuate surfaces are respectively in contact with the R angle areas (21) of the two adjacent battery cells (2); Along the second direction, the first stopper (4) has a first end portion at one end close to the first gap (3); the size of the first end portion in the first direction is equal to the size of the first gap (3) in the first direction.

4. The battery according to claim 3, characterized in that In the second direction, the first end of the first stopper (4) is flush with the first surface of the battery core (2); The first surface is a surface formed by the straight portion (22) and the R-angle region (21) of the battery cell (2) contacting each other in the second direction.

5. The battery according to claim 3, characterized in that In the second direction, the first end portion of the first stopper (4) extends into the first gap (3).

6. The battery according to claim 1, characterized in that A second gap is provided between both ends of the battery cell (2) along the second direction and the side wall of the accommodating cavity (11); the battery further comprises a second stopper (5), the second stopper (5) being located within the second gap; and one side of the second stopper (5) along the second direction abuts against the housing (1), and the other side is connected to the first stopper (4) and abuts against the battery cell (2).

7. The battery according to claim 6, characterized in that The second stopper (5) is provided with a second arcuate surface, the second arcuate surface being arranged on a side close to the battery cell (2), and the second arcuate surface is smoothly transitionally connected to the first arcuate surface of the first stopper (4) connected to the second stopper (5); the second arcuate surface is in contact with the R-angled area (21) of the battery cell (2) located in the second gap.

8. The battery according to claim 7, characterized in that The first stopper (4) and the second stopper (5) connected to the first stopper (4) are fixedly connected to form a limiter (6), and the connection between the first stopper (4) and the second stopper (5) is smoothly transitioned.

9. The battery according to claim 8, characterized in that The limiting member (6) is adhesively connected to the battery core (2).

10. The battery according to any one of claims 1 to 9, characterized in that In the first direction, the size of the first gap (3) is between 0.5% and 5% of the thickness of each battery cell (2).

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