Battery

Abstract

A battery, comprising a casing (1), a battery core (2), and blocking members (3). The casing (1) comprises a casing body (11) and a cover plate (12), the casing body (11) has a bottom wall (111), first side walls (112), and second side walls (113). The bottom wall (111) is disposed opposite to the cover plate (12). One of two opposite sides of each first side wall (112) is connected to the bottom wall (111), and the other side is connected to the corresponding second side wall (113), and the included angle between the first side wall (112) and the second side wall (113) is greater than 90° and less than 150°. The battery core (2) comprises a battery core body (21) and tabs (22) led out from at least one end of the battery core body (21), each end surface of the battery core body (21) from which the tabs (22) are led out is a first end surface, and the orthographic projection of the joint between each first side wall (112) and the corresponding second side wall (113) on the plane where the corresponding first end surface is located is located within the first end surface. At least part of each blocking member (3) is located between the corresponding first end face and the joint between the corresponding first side wall (112) and second side wall (113). A thermal runaway airflow rushing out from each first end surface is blocked by the blocking members (3) and does not directly impact the weak joints between the first side walls (112) and the second side walls (113), thereby avoiding the problem that an explosion-proof valve cannot be normally opened due to the joints being broken through first.

Description

A type of battery

[0001] This application claims priority to Chinese Patent Application No. 202411506971.3, filed on October 28, 2024, entitled "A Battery", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery. Background Technology

[0003] The battery casing has some thin areas. In the event of thermal runaway, if the gas breaches these thin areas first, it will affect the opening of the explosion-proof valve, preventing directional venting. Therefore, ensuring the explosion-proof valve can open normally during thermal runaway is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a battery, the battery comprising:

[0005] The shell includes a shell body and a cover plate. The shell body has a bottom wall, a first side wall and a second side wall. The bottom wall is disposed opposite to the cover plate. One side of the opposite sides of the first side wall is connected to the bottom wall and the other side is connected to the second side wall. The included angle between the first side wall and the second side wall is α, where 90° < α < 180°.

[0006] A battery cell, comprising a battery cell body and a tab, wherein the tab extends from at least one end of the battery cell body, and the end face from which the tab extends is a first end face, and the orthographic projection of the connection between the first sidewall and the second sidewall on the plane of the first end face lies within the first end face.

[0007] A blocking element, the blocking element being at least partially located between the first end face and the connection between the first sidewall and the second sidewall.

[0008] The battery provided in this application has a weak area at the connection between the first sidewall and the second sidewall. Since the blocking member is located at least partially between the first end face of the lead-out tab of the cell body and the connection between the first sidewall and the second sidewall, when thermal runaway occurs, the gas rushing out from the first end face is blocked by the blocking member and will not directly impact the weak connection between the first sidewall and the second sidewall. This avoids the problem that the connection between the first sidewall and the second sidewall will be broken first, causing the explosion-proof valve to fail to open normally. Attached Figure Description

[0009] Figure 1 is a perspective view of an embodiment of the battery provided in this application, in which components inside the casing are indicated by dashed lines;

[0010] Figure 2 is a plan view of Figure 1;

[0011] Figure 3 is an exploded view of the casing and battery cell shown in Figure 1;

[0012] Figure 4 is a magnified view of a portion of Figure 1;

[0013] Figure 5 is a schematic diagram of the battery cell body;

[0014] Figure 6 is a cross-sectional view of Figure 4;

[0015] Figure 7 is a perspective view of the partially hidden shell in Figure 6;

[0016] Figure 8 is a three-dimensional view of an insulating support.

[0017] The reference numerals in the attached drawings are explained as follows: 1. Shell, 11. Shell body, 111. Bottom wall, 112. First side wall, 113. Second side wall, 114. Third side wall, 115. Flanged edge, 12. Cover plate, A. Liquid injection hole, B. Receiving cavity; 2. Cell, 21. Cell body, 21a. Positive electrode plate, 21b. Negative electrode plate, 21c. Diaphragm, T. First end face, 22. Tab; 3. Blocking element, C. Through hole; 4. Insulating bracket, 41. Insulating base, 411. Support part, 4111. Main body part, 4112. Extension part, X. First snap-fit ​​part, 412. Seat plate, 42. Insulating cover, Y. Second snap-fit ​​part, 43. Flexible connection part; 5. Terminal post. Detailed Implementation

[0018] This application provides a battery. To enable those skilled in the art to better understand the technical solution of this application, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0019] As shown in the figure, the battery includes a casing 1, a cell 2, and a blocking component 3.

[0020] The housing 1 includes a housing body 11 and a cover plate 12. The housing body 11 has an opening on one side, and the cover plate 12 closes the opening, together forming the inner cavity of the housing 1. The housing 1 has an injection hole A for injecting electrolyte into the housing 1. The housing body 11 has a bottom wall 111, a first side wall 112, and a second side wall 113. The bottom wall 111 is located on the side opposite to the cover plate 12 and is approximately parallel to the cover plate 12. One side of the opposite sides of the first side wall 112 is connected to the bottom wall 111, and the other side is connected to the second side wall 113. The included angle between the first side wall 112 and the second side wall 113 is α, where 90° < α < 150°, or more specifically, 100° ≤ α ≤ 110°. The connection point between the first side wall 112 and the second side wall 113 is a weak area of ​​the housing 1 due to stress concentration or thinness. In the illustrated embodiment, the connection between the first sidewall 112 and the second sidewall 113 is arc-shaped.

[0021] The battery cell 2 is located inside the housing 1. The battery cell 2 includes a battery cell body 21 and tabs 22. The tabs 22 extend from at least one end of the battery cell body 21. The end face of the battery cell body 21 from which the tabs 22 extend is a first end face. In the illustrated embodiment, the bottom wall 111 is generally rectangular. Along the length of the bottom wall 111, a tab 22 extends from each end of the battery cell 2. The tab 22 at one end is a positive tab, and the tab 22 at the other end is a negative tab. Therefore, the battery cell body 21 has two first end faces. Along the length of the bottom wall 111, a first sidewall 112 is connected to each end of the bottom wall 111, and each first sidewall 112 is connected to a second sidewall 113. Therefore, the housing body 11 has two first sidewalls 112 and two second sidewalls 113. One first end face faces one of the first sidewalls 112 and the second sidewall 113, and the other first end face faces the other first sidewall 112 and the second sidewall 113.

[0022] As shown in Figure 5, the battery cell body 21 includes a positive electrode 21a and a negative electrode 21b, which are stacked alternately. A separator 21c is disposed between adjacent positive and negative electrode sheets. The positive and negative electrode sheets have similar structures, both including a current collector and active material layers coated on both sides of the current collector. The uncoated portion of the current collector of the positive electrode sheet protrudes beyond the coated portion, forming a single positive electrode tab. Multiple layers of single positive electrode tabs are stacked to form a positive electrode tab. Similarly, the uncoated portion of the current collector of the negative electrode sheet protrudes beyond the coated portion, forming a single negative electrode tab. Multiple layers of single negative electrode tabs are stacked to form a negative electrode tab.

[0023] The blocking member 3 is at least partially located between the first end face and the connection between the first sidewall 112 and the second sidewall 113, where the first end face (indicated by T in FIG. 5) is the end face of the negative electrode 21b. In the illustrated embodiment, one blocking member 3 is at least partially located between a first end face and the connection between the first sidewall 112 and the second sidewall 113 facing that first end face, and another blocking member 3 is at least partially located between another first end face and the connection between the first sidewall 112 and the second sidewall 113 facing that other first end face.

[0024] When thermal runaway occurs, the airflow rushing out from the first end face is blocked by the blocking member 3, and will not directly impact the weak connection between the first side wall 112 and the second side wall 113, thus avoiding the problem that the connection between the first side wall 112 and the second side wall 113 will be broken first, causing the explosion-proof valve to fail to open normally.

[0025] In some embodiments, the thickness at the junction of the first sidewall 112 and the second sidewall 113 is 'a'. In the first direction, the thickness of the blocking member 3 is 'b', 0.15 mm. 2 ≤a*b≤0.38mm 2The preferred ranges for a and b are: 0.21mm ≤ a ≤ 0.3mm, 0.5mm ≤ b ≤ 1.8mm. Specifically, the value of a can be 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, or 0.30mm; the value of b can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, or 1.8mm. The first direction refers to the direction perpendicular to the first end face. By controlling the product of a and b within a certain range, when the value of a is larger, it means that the connection between the first sidewall 112 and the second sidewall 113 is thicker, and the corresponding strength is higher, making it less likely to be broken by airflow. Therefore, b can be appropriately smaller, meaning the thickness of the blocking component 3 can be smaller. When a is smaller, the connection between the first sidewall 112 and the second sidewall 113 is thinner, and the corresponding strength is lower, making it easier to be broken by airflow. Therefore, b can be appropriately larger, meaning the thickness of the blocking component 3 can be larger. When the value of a*b is within the above range, it can not only ensure that the blocking component 3 plays a buffering role, preventing the connection between the first sidewall 112 and the second sidewall 113 from opening before the explosion-proof valve in the event of battery thermal runaway, thus improving battery safety, but also reasonably control the thickness of the blocking component 3 to ensure the internal space of the battery casing for placing the battery cells, thereby ensuring the energy density of the individual battery cells. If the value of a*b is too large, it means that either the value of a is too large, the value of b is too large, or both the values ​​of a and b are too large. When the value of a is too large, it will increase the thickness at the connection between the first sidewall 112 and the second sidewall 113 of the casing, thereby increasing the weight of the individual battery and reducing the energy density of the battery. When the value of b is too large, the blocking member 3 will be too thick, resulting in a reduction in the space inside the battery casing for placing the battery cells, thus reducing the energy density of the battery. If the value of a*b is too small, it means that either the value of a is too small, the value of b is too small, or both the values ​​of a and b are too small. When the value of a is too small, it will result in the thickness at the connection between the first sidewall 112 and the second sidewall 113 of the casing will be too small, making it prone to cracking and affecting the opening of the explosion-proof valve. When the value of b is too small, the blocking member 3 will be too thin, and in the event of thermal runaway, the blocking member 3 will not be able to effectively block the impact of gas on the connection between the first sidewall 112 and the second sidewall 113, thus affecting the opening of the explosion-proof valve.

[0026] In some embodiments, in the first direction, the thickness of the blocking member 3 is b, and the distance between the blocking member 3 and the first end face is c, 0.36 mm. 2 ≤b*c≤0.55mm 2The preferred range of c is 0.2mm ≤ c ≤ 1.1mm, and the specific value of c can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, or 1.1mm. The first direction refers to the direction perpendicular to the first end face. By controlling the product of b and c within a certain range, it can be ensured that the blocking effect of the blocking member 3 is optimal while minimizing the impact on the energy density of the single battery cell when the space occupied by the blocking member 3 inside the casing is within a certain range. When c is larger, that is, when the distance between the blocking member 3 and the first end face is larger, the impact force of the airflow rushing out from the first end face on the blocking member 3 during thermal runaway is smaller, and the blocking member 3 is less likely to be broken by the airflow. Therefore, b can be appropriately smaller, that is, the thickness of the blocking member 3 can be smaller. When c is smaller, meaning the distance between the blocking component 3 and the first end face is smaller, the impact force of the airflow rushing out from the first end face on the blocking component 3 during thermal runaway is greater, and the blocking component 3 is more easily broken by the airflow. Therefore, b can be appropriately larger, meaning the thickness of the blocking component 3 needs to be larger. When the value of b*c is less than the minimum value, it means that b, c, or both b and c are too small. When b is too small, the thickness of the blocking component 3 is too small and cannot play a role in blocking the gas impact. When c is too small, the distance between the blocking component 3 and the first end face is too small, and the blocking component 3 is prone to damaging the electrode, thus affecting the battery life. When the value of b*c is greater than the maximum value, it means that b, c, or both b and c are too large. When b is too large, the blocking component 3 is too thick, occupying too much internal space in the casing, affecting the space for the battery cell, thus reducing the energy density of the single battery. When c is too large, the distance between the blocking component 3 and the first end face is too large, resulting in a reduction in the space inside the casing for placing the battery cell, thus reducing the energy density of the single battery.

[0027] In some embodiments, in the second direction, the minimum distance between the blocking member 3 and the bottom wall 111 is d, and the minimum distance between the second side wall 113 and the bottom wall 111 is t, where 0.02 ≤ d / t ≤ 0.4. Preferably, the range of d is 0.5 mm ≤ d ≤ 10 mm, and specific values ​​of d can be 0.5 mm, 1.5 mm, 2 mm, 2.16 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm. Preferably, the range of t is 5 mm ≤ t ≤ 25 mm, and specific values ​​of t can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, and 25 mm. The second direction is perpendicular to the bottom wall 111. By controlling the ratio of d and t within a certain range, the blocking component 3 can be guaranteed to have a good airflow blocking effect, while avoiding the blocking component 3 from puncturing the shell 1. When t is constant, if the value of d / t is too small, it means that d is too small. When d is too small, it means that the distance between the blocking component 3 and the bottom wall 111 is very small. In this case, the shell 1 is easily punctured by the blocking component 3 when it deforms. When t is constant, if the value of d / t is too large, it means that d is too large. When d is too large, it means that the height of the blocking component 3 in the second direction is small. As a result, the blocking component 3 cannot effectively block the thermal runaway airflow rushing out from the first end face from impacting the first side wall 112, which poses a risk of the first side wall 112 being punctured and affects the opening of the explosion-proof valve.

[0028] In some embodiments, the area of ​​the obstruction member 3 projected onto the first end face is S1, and the area of ​​the first end face is S2, where 0.6 ≤ S1 / S2 ≤ 0.95. By controlling S1 / S2 within this range, a good airflow obstruction effect can be achieved, while also ensuring a fast airflow discharge speed and a good electrolyte wetting effect. If S1 / S2 is too small, the airflow obstruction effect will be poor; if S1 / S2 is too large, the gas cannot be discharged quickly during thermal runaway, and the electrolyte cannot quickly and evenly wet the cell body 21 during electrolyte injection.

[0029] In some embodiments, the blocking member 3 is provided with a through hole C, which extends through both the side of the blocking member 3 closest to the cell body 21 and the side furthest from the cell body 21. This design allows the electrolyte to reach the cell body 21 through the through hole C during injection, improving the wetting effect of the electrolyte. It should be noted that with the through hole C, in the event of thermal runaway, some of the airflow will pass through the through hole C and rush towards the housing 1. Because kinetic energy is lost when passing through the through hole C, the impact force when it subsequently rushes towards the housing 1 is smaller, thus preventing it from breaking through the housing 1. This application does not limit the shape of the through hole C; for example, it can be circular, elliptical, polygonal, or triangular.

[0030] In some embodiments, in the second direction, the distance between the blocking member 3 and the bottom wall 111 is d, and the thickness of the battery cell body 21 is e, where 0.01 ≤ d / e ≤ 0.3. Preferably, d ranges from 0.5 mm to 10 mm, and specific values ​​of d can be 0.5 mm, 1.5 mm, 2 mm, 2.16 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm. Preferably, e ranges from 10 mm to 30 mm, and specific values ​​of e can be 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 18.3 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, and 30 mm. The second direction is perpendicular to the bottom wall 111. By controlling d / e within the aforementioned range, during electrolyte injection, the electrolyte can penetrate into the cell body 21 through the gap between the blocking member 3 and the bottom wall 111. This balances the wetting effect of the electrolyte and the airflow blocking effect, while ensuring that the blocking member 3 will not puncture the shell 1 when it deforms. When e is constant, if the value of d / e is too large, it means that d is too large. When d is too large, it means that the height of the blocking member 3 in the second direction is small, resulting in poor airflow blocking effect. When e is constant, if the value of d / e is too small, it means that d is too small. When d is too small, it means that the distance between the blocking member 3 and the bottom wall 111 is very small. In this case, the shell 1 is easily punctured by the blocking member 3 when it deforms, and the electrolyte cannot penetrate into the cell body 21 through the gap between the blocking member 3 and the bottom wall 111, which is detrimental to the wetting effect of the electrolyte.

[0031] It should be noted that both the via C provided on the blocking member 3 and the gap between the blocking member 3 and the bottom wall 111 (i.e., the distance d between the blocking member 3 and the bottom wall 111 in the second direction is greater than 0) can improve the wetting effect of the electrolyte. In some embodiments, both structures are used simultaneously. In some embodiments, only one of the two structures is used.

[0032] In some embodiments, in the second direction, the distance between the second sidewall 113 and the cover plate 12 is f, and the distance between the blocking member 3 and the cover plate 12 is g. f > g. The preferred range of f is: 8mm ≤ f ≤ 25mm, specifically, the value of f can be 8mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 23mm, or 25mm. The preferred range of g is: 5mm ≤ g ≤ 20mm, specifically, the value of g can be 5mm, 8mm, 8.5mm, 11mm, 15mm, 18mm, or 20mm. f > g means that a portion of the blocking member 3 is located on the side of the second sidewall 113 closer to the cover plate 12. Thus, the blocking member 3 can better prevent the airflow rushing from the first end face from directly impacting the connection between the first sidewall 112 and the second sidewall 113, and can also prevent the airflow rushing from the first end face from directly impacting the second sidewall 113, resulting in a better airflow blocking effect.

[0033] In some embodiments, the shell body 11 has a third sidewall 114. One side of the opposite sides of the third sidewall 114 is connected to the side of the second sidewall 113 away from the first sidewall 112, and the other side is folded outward from the shell body 11 to form a flange 115, which is used for welding to the cover plate 12. The included angle between the second sidewall 113 and the third sidewall 114 is β, where 90°≤β<120°. In the illustrated embodiment, each of the two second sidewalls 113 is connected to a third sidewall 114. The first sidewall 112, second sidewall 113, third sidewall 114, and cover plate 12 on one side together form a receiving cavity B, and the positive electrode tab extends from the cell body 21 into the receiving cavity B. The first sidewall 112, second sidewall 113, third sidewall 114, and cover plate 12 on the other side together form another receiving cavity B, and the negative electrode tab extends from the cell body 21 into this other receiving cavity B.

[0034] As shown in the figure, the battery includes two sets of terminals 5. The cover plate 12 is roughly rectangular. Along the length of the cover plate 12, the two sets of terminals 5 are fixed to both ends of the cover plate 12, one set being the positive terminal and the other being the negative terminal. The positive terminal is electrically connected to the positive electrode tab, and the negative terminal is electrically connected to the negative electrode tab.

[0035] In some embodiments, the battery includes an insulating support 4, which is at least partially located within the aforementioned receiving cavity B. The insulating support 4 insulates the terminal 5 from the cell body 21. In the illustrated embodiment, each of the two receiving cavities B has an insulating support 4, one insulating support 4 insulating the positive terminal and the cell body 21, and the other insulating support 4 insulating the negative terminal and the cell body 21.

[0036] In some embodiments, the blocking member 3 and the insulating support 4 are an integral structure. Specifically, they can be integrally injection molded.

[0037] In some embodiments, the blocking member 3 and the insulating support 4 are separate structures, with the blocking member 3 fixed to the insulating support 4.

[0038] In some embodiments, the insulating support 4 is not provided, and the blocking member 3 is fixed to the housing 1.

[0039] In some embodiments, the insulating support 4 includes an insulating base 41, an insulating cover 42, and a flexible connecting portion 43. The insulating base 41 is fixed to the cover plate 12. One side of the opposite sides of the insulating cover 42 is connected to the insulating base 41 via the flexible connecting portion 43, and the other side is connected to the blocking member 3. Under the flexible deformation of the flexible connecting portion 43, the insulating cover 42 can be flipped relative to the insulating base 41 to an open or closed position. When the insulating cover 42 is flipped, the blocking member 3 flips accordingly. When connecting the tab and the pole, the insulating cover 42 is opened, and after connection, the insulating cover 42 is closed. When the insulating cover 42 is in the closed position, the tab 22 in the receiving cavity B is located between the insulating cover 42 and the insulating base 41. Specifically, the flexible connecting portion 43 can be a thin sheet structure injection molded, or it can be an assembled elastic component such as a spring.

[0040] In some embodiments, the insulating base 41 has two support portions 411 and a base plate 412 connected between the two support portions 411. When the insulating cover 42 is in the closed position, the insulating cover 42 is engaged between the two support portions 411. The electrode tab 22 in the receiving cavity B is located between the insulating cover 42 and the base plate 412 and between the two support portions 411.

[0041] In some embodiments, the support portion 411 includes a main body portion 4111 and an extension portion 4112. One side of the opposite sides of the main body portion 4111 is fixed to the cover plate 12, and the other side is connected to the extension portion 4112. The extension portion 4112 extends from the main body portion 4111 in a direction away from the cover plate 12. When the insulating cover 42 is in the closed position, the insulating cover 42 is engaged between the two main bodies 4111. Specifically, the insulating cover 42 is provided with a second engaging portion Y, and the two main bodies 4111 are provided with a first engaging portion X. The first engaging portion X and the second engaging portion Y engage with each other. Furthermore, when the insulating cover 42 is in the closed position, the blocking member 3 abuts between the two extension portions 4112. Under the abutting action of the two extension portions 4112, the positional stability of the blocking member 3 is high, thereby more stably blocking the thermal runaway airflow.

[0042] In some embodiments, the distance between the blocking member 3 and the cover plate 12 in the second direction is g. In the second direction, the distance between the insulating cover 42 and the cover plate 12 is h, where h > g. Preferably, 1 mm ≤ g ≤ 8 mm. The second direction is perpendicular to the bottom wall 111. This design allows the blocking member 3 to limit the position of the tab 22, preventing excessive displacement and breakage of the tab 22.

[0043] The above examples illustrate the principles and implementation methods of this application. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A battery, characterized in that, The battery includes: The shell (1) includes a shell body (11) and a cover plate (12). The shell body (11) has a bottom wall (111), a first side wall (112) and a second side wall (113). The bottom wall (111) is disposed opposite to the cover plate (12). One side of the opposite sides of the first side wall (112) is connected to the bottom wall (111) and the other side is connected to the second side wall (113). The included angle between the first side wall (112) and the second side wall (113) is α, where 90° < α < 150°. The battery cell (2) is located inside the housing (1). The battery cell (2) includes a battery cell body (21) and a tab (22). The tab (22) is led out from at least one end of the battery cell body (21). The end face of the battery cell body (21) from which the tab (22) is led out is a first end face. The orthographic projection of the connection between the first sidewall (112) and the second sidewall (113) on the plane of the first end face is located within the first end face. A blocking member (3) is located at least partially between the first end face and the connection between the first sidewall (112) and the second sidewall (113).

2. The battery according to claim 1, characterized in that, The thickness at the connection between the first sidewall (112) and the second sidewall (113) is 'a'. The direction perpendicular to the first end face is the first direction. In the first direction, the thickness of the blocking member (3) is 'b', which is 0.15 mm. 2 ≤a*b≤0.38mm 2 , 0.21mm≤a≤0.3mm, 0.5mm≤b≤1.8mm.

3. The battery according to any one of claims 1-2, characterized in that, The direction perpendicular to the first end face is the first direction. In the first direction, the thickness of the blocking member (3) is b, and the distance between the blocking member (3) and the first end face in the first direction is c, which is 0.36 mm. 2 ≤b*c≤0.55mm 2 , 0.2mm≤c≤1.1mm.

4. The battery according to any one of claims 1-3, characterized in that, The direction perpendicular to the bottom wall (111) is the second direction. In the second direction, the minimum distance between the blocking member (3) and the bottom wall (111) is d, and the minimum distance between the second side wall (113) and the bottom wall (111) is t. 0.02≤d / t≤0.4, 0.5mm≤d≤10mm, 5mm≤t≤25mm.

5. The battery according to any one of claims 1-4, characterized in that, The area of ​​the orthographic projection of the blocking member (3) on the first end face is S1, and the area of ​​the first end face is S2, 0.6≤S1 / S2≤0.

95.

6. The battery according to any one of claims 1-5, characterized in that, The blocking member (3) is provided with a through hole (C), which penetrates the side of the blocking member (3) near the battery cell body (21) and the side away from the battery cell body (21).

7. The battery according to any one of claims 1-6, characterized in that, The direction perpendicular to the bottom wall (111) is the second direction. In the second direction, the distance between the blocking member (3) and the bottom wall (111) is d, and the thickness of the battery cell body (21) is e, 0.01≤d / e≤0.3, 0.5mm≤d≤10mm, 10mm≤e≤30mm.

8. The battery according to any one of claims 1-7, characterized in that, The direction perpendicular to the bottom wall (111) is the second direction. In the second direction, the distance between the second side wall (113) and the cover plate (12) is f, and the distance between the blocking member (3) and the cover plate (12) is g, where f > g.

9. The battery according to any one of claims 1-8, characterized in that, The shell body (11) has a third sidewall (114). One side of the opposite sides of the third sidewall (114) is connected to the side of the second sidewall (113) away from the first sidewall (112), and the other side is folded outward to the shell body (11) to form a flange (115). The flange (115) is used to weld with the cover plate (12). The included angle between the second sidewall (113) and the third sidewall (114) is β, 90°≤β<120°. The first sidewall (112), the second sidewall (113), the third sidewall (114) and the cover plate (12) enclose a receiving cavity (B). The electrode tab (22) extends from the battery cell body (21) into the receiving cavity (B).

10. The battery according to claim 9, characterized in that, The battery also includes an insulating support (4), which is at least partially located within the receiving cavity (B); the blocking member (3) is an integral structure with the insulating support (4), or the blocking member (3) and the insulating support (4) are separate structures, with the blocking member (3) fixed to the insulating support (4).

11. The battery according to claim 10, characterized in that, The insulating support (4) includes an insulating base (41), an insulating cover (42), and a flexible connecting part (43). The insulating base (41) is fixed to the cover plate (12). One side of the insulating cover (42) is connected to the insulating base (41) through the flexible connecting part (43) so that the insulating cover (42) can be flipped to the open or closed position relative to the insulating base (41). The other side is connected to the blocking member (3). When the insulating cover (42) is in the closed position, the tab (22) in the receiving cavity (B) is located between the insulating cover (42) and the insulating base (41).

12. The battery according to claim 11, characterized in that, The insulating base (41) has two support portions (411) and a base plate (412) connected between the two support portions (411). When the insulating cover (42) is in the closed position, the insulating cover (42) is engaged between the two support portions (411). The tab (22) in the receiving cavity (B) is located between the insulating cover (42) and the base plate (412).

13. The battery according to claim 12, characterized in that, The support portion (411) includes a main body portion (4111) and an extension portion (4112). One side of the opposite sides of the main body portion (4111) is fixed to the cover plate (12), and the other side is connected to the extension portion (4112). The extension portion (4112) extends from the main body portion (4111) in a direction away from the cover plate (12). When the insulating cover (42) is in the closed position, the insulating cover (42) is engaged between the two main bodies (4111), and the blocking member (3) abuts between the two extension portions (4112).

14. The battery according to claims 1-13, characterized in that, The tabs (22) are led out from both ends of the cell body (21). One end of the tab (22) is the positive tab, and the other end of the tab (22) is the negative tab. The battery also includes two sets of terminals (5). In the length direction of the cover plate (12), the two sets of terminals (5) are fixed to both ends of the cover plate (12), one set of positive terminals and one set of negative terminals. The positive terminal is electrically connected to the positive tab, and the negative terminal is electrically connected to the negative tab.

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