Battery

Abstract

The invention provides a battery which comprises a shell, a battery cell and a blocking piece, the shell comprises a shell body and a cover plate, the shell body is provided with a bottom wall, a first side wall and a second side wall, the bottom wall and the cover plate are oppositely arranged, one side of the two opposite sides of the first side wall is connected with the bottom wall, the other side of the two opposite sides of the first side wall is connected with the second side wall, and the included angle between the first side wall and the second side wall is larger than 90 degrees and smaller than 180 degrees; the battery cell comprises a battery cell body and tabs led out from at least one end of the battery cell body, the end face, where the tabs are led out, of the battery cell body is a first end face, and the orthographic projection of the joint of the first side wall and the second side wall on the plane where the first end face is located is located in the first end face; the blocking piece is at least partially located between the first end face and the connecting position of the first side wall and the second side wall, the orthographic projection area of the blocking piece on the first end face is S1, the area of the first end face is S2, 0.6 < = S1 / S2 < = 0.95, and the problem that the anti-explosion valve cannot be normally opened due to the fact that the connecting position of the first side wall and the second side wall is firstly broken through is avoided.

Description

[0001] This application is a divisional application based on the original invention patent application number: 2024115069713, the application date is October 28, 2024, and the application name is "A Battery". Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery. Background Art

[0003] Some areas of the battery shell are relatively weak. When thermal runaway occurs, if the gas first breaks through the weak area of ​​the shell, it will affect the opening of the explosion-proof valve and fail to achieve directional exhaust. In view of this, how to ensure that the explosion-proof valve can open normally during thermal runaway is a technical problem that needs to be solved by technical personnel in this field. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a battery, comprising:

[0005] A shell, the shell comprising a shell body and a cover plate, the shell body comprising a bottom wall, a first side wall and a second side wall, the bottom wall being arranged opposite to the cover plate, one of two opposite sides of the first side wall being connected to the bottom wall, and the other side being connected to the second side wall, the angle between the first side wall and the second side wall being α, 90°<α<180°;

[0006] A battery cell, wherein the battery cell comprises a battery cell body and a tab, wherein the tab is led out from at least one end of the battery cell body, an end face of the battery cell body from which the tab is led out is a first end face, and an orthographic projection of a connection point between a first side wall and a second side wall on a plane where the first end face is located is located within the first end face;

[0007] a blocking member, the blocking member being at least partially located between the first end surface and a connection between the first side wall and the second side wall;

[0008] The area of ​​the orthographic projection of the blocking member on the first end surface is S1, the area of ​​the first end surface is S2, and 0.6≤S1 / S2≤0.95.

[0009] In the battery provided in the present application, the connection between the first side wall and the second side wall is a weak area of ​​the shell. Since the blocking member is at least partially located between the first end face of the lead-out ear of the battery body and the connection between the first side wall and the second side wall, 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 side wall and the second side wall, thereby avoiding the problem that the connection between the first side wall and the second side wall is broken first, resulting in the explosion-proof valve not being able to open normally; and by controlling S1 / S2 within the range of 0.6-0.95, it is possible to achieve a better airflow blocking effect while taking into account a faster airflow discharge speed and a better electrolyte infiltration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A three-dimensional diagram of an embodiment of a battery provided by the present application, in which components inside the housing are indicated by dotted lines;

[0011] Figure 2 for Figure 1 Floor plan of

[0012] Figure 3 for Figure 1 An exploded schematic diagram of the housing and battery cell;

[0013] Figure 4 for Figure 1 A partial enlarged view of

[0014] Figure 5 It is a schematic diagram of the structure of the battery cell body;

[0015] Figure 6 for Figure 4 A cross-sectional view of

[0016] Figure 7 for Figure 6 A stereogram with a partial shell hidden;

[0017] Figure 8 A three-dimensional diagram of an insulating bracket.

[0018] The following are the descriptions of the reference numerals:

[0019] 1 shell, 11 shell body, 111 bottom wall, 112 first side wall, 113 second side wall, 114 third side wall, 115 flange, 12 cover plate, A injection hole, B accommodating cavity;

[0020] 2 battery cell, 21 battery cell body, 21a positive electrode sheet, 21b negative electrode sheet, 21c separator, T first end surface, 22 pole ear;

[0021] 3 blocking member, C through hole;

[0022] 4 insulating bracket, 41 insulating seat, 411 supporting portion, 4111 main body, 4112 extending portion, X first clamping portion, 412 seat plate, 42 insulating cover, Y second clamping portion, 43 flexible connecting portion;

[0023] 5 poles. DETAILED DESCRIPTION

[0024] The present application provides a battery. In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] As shown in the figure, the battery includes a shell 1, a battery cell 2, and a blocking member 3.

[0026] The shell 1 includes a shell body 11 and a cover plate 12. An opening is provided on one side of the shell body 11. The cover plate 12 closes the opening of the shell body 11 and encloses the inner cavity of the shell 1 together with the shell body 11. The shell 1 is provided with a liquid injection hole A for injecting electrolyte into the shell 1. 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 arranged on the side opposite to the cover plate 12, and the bottom wall 111 is substantially parallel to the cover plate 12. One of the two 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 angle between the first side wall 112 and the second side wall 113 is α, 90°<α<180°, further 90°<α<150°, and more specifically, it can be 100°≤α≤110°. The connection between the first side wall 112 and the second side wall 113 is a weak area of ​​the shell 1 due to stress concentration or thin thickness. In the illustrated embodiment, the connection between the first side wall 112 and the second side wall 113 is arc-shaped.

[0027] The battery cell 2 is located in the shell 1. The battery cell 2 includes a battery cell body 21 and a pole ear 22. The pole ear 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 pole ear 22 is led out is the first end face. In the illustrated embodiment, the bottom wall 111 is roughly rectangular. In the length direction of the bottom wall 111, a pole ear 22 is led out from each end of the battery cell 2. The pole ear 22 at one end is a positive pole ear, and the pole ear 22 at one end is a negative pole ear. Therefore, the battery cell body 21 has two first end faces. In the length direction of the bottom wall 111, each end of the bottom wall 111 is connected to a first side wall 112, and each first side wall 112 is connected to a second side wall 113. Therefore, the shell body 11 has two first side walls 112 and two second side walls 113. One first end face faces one of the first side walls 112 and the second side wall 113, and the other first end face faces the other first side wall 112 and the second side wall 113.

[0028] like Figure 5As shown, the battery cell body 21 includes a positive electrode sheet 21a and a negative electrode sheet 21b, and the positive electrode sheets and the negative electrode sheets are alternately stacked one by one, and a separator 21c is provided between adjacent positive electrode sheets and negative electrode sheets. The structures of the positive electrode sheets and the negative electrode sheets are similar, and both include a current collector and an active material layer coated on both sides of the current collector. The part of the current collector of the positive electrode sheet that is not coated with the active material protrudes from the part that is coated with the active material to form a positive electrode tab monolith. Multiple layers of positive electrode tab monoliths are stacked to form a positive electrode tab. The part of the current collector of the negative electrode sheet that is not coated with the active material protrudes from the part that is coated with the active material to form a negative electrode tab monolith. Multiple layers of negative electrode tab monoliths are stacked to form a negative electrode tab.

[0029] The blocking member 3 is at least partially located between the first end surface and the connection between the first side wall 112 and the second side wall 113. Figure 5 In the embodiment shown in the figure, one blocking member 3 is at least partially located between one first end face and the connection between the first side wall 112 and the second side wall 113 that the first end face faces, and another blocking member 3 is at least partially located between another first end face and the connection between the first side wall 112 and the second side wall 113 that the other first end face faces.

[0030] 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, thereby avoiding the problem that the connection between the first side wall 112 and the second side wall 113 is broken first, resulting in the explosion-proof valve being unable to open normally.

[0031] In some embodiments, the thickness of the connection between the first side wall 112 and the second side wall 113 is a. In the first direction, the thickness of the blocking member 3 is b, 0.15 mm 2 ≤a*b≤0.38 mm 2, the preferred ranges of a and b are: 0.21mm≤a≤0.3mm, 0.5mm≤b≤1.8mm, and the specific value of a can be 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 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, 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, that is, when the value of a is larger, it means that the thickness of the connection between the first side wall 112 and the second side wall 113 is larger, the corresponding strength is higher, and it is less likely to be broken by the airflow, so b can be appropriately smaller, that is, the thickness of the blocking member 3 can be smaller; when a is smaller, the thickness of the connection between the first side wall 112 and the second side wall 113 is thinner, the corresponding strength is lower, and it is easier to be broken by the airflow, so b can be appropriately larger, that is, the thickness of the blocking member 3 can be larger. When the value of a*b is within the above range, it can not only ensure that the blocking member 3 plays a buffering role, preventing the connection between the first side wall 112 and the second side wall 113 from opening before the explosion-proof valve when the battery is thermally runaway, thereby improving the safety of the battery, but also reasonably controlling the thickness of the blocking member 3 to ensure the accommodation space inside the battery shell for placing the battery cell, thereby ensuring the energy density of the single battery. If the value of a*b is too large, it means that the value of a is too large or the value of b is too large or the values ​​of a and b are both too large. When the value of a is too large, the thickness of the connection between the first side wall 112 and the second side wall 113 of the shell will increase, thereby increasing the weight of the single battery and reducing the energy density of the battery; when the value of b is too large, the barrier 3 is too thick, resulting in a reduction in the space inside the battery shell for placing the battery cell, reducing the energy density of the battery. If the value of a*b is too small, it means that the value of a is too small or the value of b is too small or the values ​​of a and b are both too small. When the value of a is too small, the thickness of the connection between the first side wall 112 and the second side wall 113 of the shell will be too small, which is easy to crack and affect the explosion-proof valve to explode; when the value of b is too small, the barrier 3 is too thin. When thermal runaway occurs, the barrier 3 cannot effectively block the impact of gas on the connection between the first side wall 112 and the second side wall 113, thereby affecting the explosion-proof valve to explode.

[0032] 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 surface is c, 0.36 mm. 2 ≤b*c≤0.55 mm 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, 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 when the blocking member 3 occupies the internal space of the shell within a certain range, the blocking effect of the blocking member 3 is optimal, and the impact on the energy density of the single battery is minimized; when c is larger, that is, the larger the distance between the blocking member 3 and the first end face, the smaller the impact of the airflow rushing out from the first end face on the blocking member 3 during thermal runaway, and the blocking member 3 is less likely to be broken by the airflow, so b can be appropriately smaller, that is, the thickness of the blocking member 3 can be smaller. When c is smaller, that is, the smaller the distance between the barrier 3 and the first end face, the greater the impact force of the airflow rushing out from the first end face on the barrier 3 during thermal runaway, and the barrier 3 is more easily broken by the airflow, so b can be appropriately larger, that is, the thickness of the barrier 3 needs to be larger. When the value of b*c is less than the minimum value, it means that b is too small or c is too small or both b and c are too small. When b is too small, the thickness of the barrier 3 is too small and cannot play the role of blocking the impact of gas; when c is too small, the distance between the barrier 3 and the first end face is too small, and the barrier 3 is easy to damage the pole piece, thereby affecting the battery life; when the value of b*c is greater than the maximum value, it means that b is too large or c is too large or both b and c are too large. When b is too large, the barrier 3 is too thick and occupies too much space inside the shell, affecting the storage space of the battery cell, thereby reducing the energy density of the single battery. When c is too large, the distance between the barrier 3 and the first end face is too large, resulting in a reduction in the space inside the shell for placing the battery cell, thereby reducing the energy density of the single battery.

[0033] In some embodiments, in the second direction, the minimum spacing between the blocking member 3 and the bottom wall 111 is d, and the minimum spacing between the second side wall 113 and the bottom wall 111 is t, 0.02≤d / t≤0.4. The preferred range of d is: 0.5mm≤d≤10mm, and the specific value of d can be 0.5mm, 1.5mm, 2mm, 2.16mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm. The preferred range of t is: 5mm≤t≤25mm, and the specific value of t can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm. Wherein, the second direction is the direction perpendicular to the bottom wall 111. By controlling the ratio of d and t within a certain range, it can be ensured that the blocking member 3 has a good airflow blocking effect and prevent the blocking member 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 member 3 and the bottom wall 111 is very small, so that the shell 1 is easily punctured by the blocking member 3 when it is deformed. 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 member 3 in the second direction is small, resulting in the blocking member 3 being unable to effectively block the thermal runaway airflow rushing out from the first end face from impacting the first side wall 112, causing the first side wall 112 to be at risk of being punctured, affecting the opening of the explosion-proof valve.

[0034] In some embodiments, the area of ​​the orthographic projection of the blocking member 3 on the first end face is S1, the area of ​​the first end face is S2, and 0.6≤S1 / S2≤0.95. By controlling S1 / S2 within this range, it is possible to achieve a better airflow blocking effect, and also to take into account a faster airflow discharge speed and a better electrolyte infiltration effect. If S1 / S2 is too small, the airflow blocking effect is not good. If S1 / S2 is too large, the gas cannot be discharged quickly during thermal runaway, and the electrolyte cannot quickly and evenly infiltrate the battery cell body 21 during injection.

[0035] In some embodiments, the blocking member 3 is provided with a through hole C, and the through hole C passes through the side of the blocking member 3 close to the battery cell body 21 and the side away from the battery cell body 21. With this design, the electrolyte can reach the battery cell body 21 through the through hole C during injection, which is beneficial to improving the infiltration effect of the electrolyte. It should be noted that when the through hole C is provided, part of the airflow will pass through the through hole C and rush toward the shell 1 when thermal runaway occurs. Since kinetic energy is lost when passing through the through hole C, the impact force when rushing toward the shell 1 is relatively small, so the shell 1 will not be broken. The present application does not limit the shape of the through hole C, for example, it can be circular, elliptical, polygonal, or triangular.

[0036] In some embodiments, in the second direction, the spacing between the blocking member 3 and the bottom wall 111 is d, the thickness of the battery body 21 is e, and 0.01≤d / e≤0.3. The preferred range of d is: 0.5mm≤d≤10mm, and the specific value of d can be 0.5mm, 1.5mm, 2mm, 2.16mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm. The preferred range of e is 10mm≤e≤30mm, and the specific value of e can be 10mm, 12mm, 14mm, 16mm, 18mm, 18.3mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm. Among them, the second direction is the direction perpendicular to the bottom wall 111. By controlling d / e within the above range, the electrolyte can penetrate into the battery body 21 through the gap between the blocking member 3 and the bottom wall 111 during injection, which can take into account the electrolyte infiltration effect and the airflow blocking effect and ensure that the blocking member 3 will not puncture the shell 1 when the shell 1 is deformed. 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, so the airflow blocking effect is not good. 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 spacing between the blocking member 3 and the bottom wall 111 is very small, so that the shell 1 is easily punctured by the blocking member 3 when it is deformed, and the electrolyte cannot penetrate into the battery body 21 through the gap between the blocking member 3 and the bottom wall 111, which is not conducive to the electrolyte infiltration effect.

[0037] It should be noted that the above-mentioned through hole C is provided on the blocking member 3, and there is a gap between the blocking member 3 and the bottom wall 111 (that is, the distance d between the blocking member 3 and the bottom wall 111 in the second direction is greater than 0). Both structures can improve the infiltration effect of the electrolyte. In some embodiments, both structures are used at the same time. In some embodiments, one of the two structures is used.

[0038] In some embodiments, 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. f>g. The preferred range of f is: 8mm≤f≤25mm, and specifically, the value of f can be 8mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 23mm, 25mm. The preferred range of g is: 5mm≤g≤20mm, and specifically, the value of g can be 5mm, 8mm, 8.5mm, 11mm, 15mm, 18mm, 20mm. f>g means that a part of the blocking member 3 is located on the side of the second side wall 113 close to the cover plate 12, so that the blocking member 3 can better block the airflow rushing out from the first end face from directly impacting the connection between the first side wall 112 and the second side wall 113, and can also block the airflow rushing out from the first end face from directly impacting the second side wall 113, and the airflow blocking effect is better.

[0039] In some embodiments, the shell body 11 has a third side wall 114, one of the two opposite sides of the third side wall 114 is connected to the side of the second side wall 113 away from the first side wall 112, and the other side is folded outwardly toward the shell body 11 to form a flange 115, and the flange 115 is used for welding with the cover plate 12. The angle between the second side wall 113 and the third side wall 114 is β, 90°≤β<120°. In the illustrated embodiment, two second side walls 113 are each connected to a third side wall 114. The first side wall 112, the second side wall 113, the third side wall 114 and the cover plate 12 on one side are enclosed together to form a receiving cavity B, and the positive electrode tab extends from the battery body 21 into the receiving cavity B. The first side wall 112, the second side wall 113, the third side wall 114 and the cover plate 12 on the other side are enclosed together to form another receiving cavity B, and the negative electrode tab extends from the battery body 21 into the other receiving cavity B.

[0040] As shown in the figure, the battery includes two groups of poles 5, and the cover plate 12 is roughly rectangular. In the length direction of the cover plate 12, the two groups of poles 5 are respectively fixed to the two ends of the cover plate 12, one group is a positive pole, and the other group is a negative pole. The positive pole is electrically connected to the positive pole tab, and the negative pole is electrically connected to the negative pole tab.

[0041] In some embodiments, the battery includes an insulating support 4, and the insulating support 4 is at least partially located in the above-mentioned accommodating cavity B. The insulating support 4 insulates the pole 5 from the battery body 21. In the illustrated embodiment, an insulating support 4 is provided in each of the two accommodating cavities B, one insulating support 4 insulates the positive pole 5 from the battery body 21, and the other insulating support 4 insulates the negative pole 5 from the battery body 21.

[0042] In some embodiments, the blocking member 3 and the insulating bracket 4 are an integral structure, specifically, they can be integrally injection molded.

[0043] In some embodiments, the blocking member 3 and the insulating bracket 4 are separate structures, and the blocking member 3 is fixed to the insulating bracket 4 .

[0044] In some embodiments, the insulating bracket 4 is not provided, and the blocking member 3 is fixed to the housing 1 .

[0045] In some embodiments, the insulating bracket 4 includes an insulating seat 41, an insulating cover 42 and a flexible connecting portion 43. The insulating seat 41 is fixed to the cover plate 12. One of the two opposite sides of the insulating cover 42 is connected to the insulating seat 41 through 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 to an open position or a closed position relative to the insulating seat 41. When the insulating cover 42 is flipped, the blocking member 3 is flipped accordingly. When connecting the pole ear and the pole, open the insulating cover 42, and after the connection is completed, close the insulating cover 42. When the insulating cover 42 is in the closed position, the pole ear 22 in the accommodating cavity B is located between the insulating cover 42 and the insulating seat 41. Specifically, the flexible connecting portion 43 can be a thin sheet structure formed by injection molding, or it can be an assembled elastic member such as a spring.

[0046] In some embodiments, the insulating seat 41 has two support parts 411 and a seat plate 412 connected between the two support parts 411. When the insulating cover 42 is in the closed position, the insulating cover 42 is clamped between the two support parts 411, and the pole ear 22 in the accommodating cavity B is located between the insulating cover 42 and the seat plate 412 and between the two support parts 411.

[0047] In some embodiments, the support portion 411 includes a main body 4111 and an extension portion 4112. One of the two opposite sides of the main body 4111 is fixed to the cover plate 12, and the other side is connected to the extension portion 4112, and the extension portion 4112 extends from the main body 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 clamped between the two main bodies 4111. Specifically, the insulating cover 42 is provided with a second clamping portion Y, and the two main bodies 4111 are provided with a first clamping portion X, and the first clamping portion X and the second clamping portion Y are clamped with each other. In addition, when the insulating cover 42 is in the closed position, the blocking member 3 abuts between the two extension portions 4112. Under the abutment of the two extension portions 4112, the position stability of the blocking member 3 is relatively high, so that the thermal runaway airflow can be blocked more stably.

[0048] In some embodiments, in the second direction, the distance between the blocking member 3 and the cover plate 12 is g. In the second direction, the distance between the insulating cover 42 and the cover plate 12 is h, and h>g. Preferably, 1mm≤g≤8mm. The second direction is a direction perpendicular to the bottom wall 111. With this design, the blocking member 3 can limit the tab 22 to prevent the tab 22 from being displaced too much and breaking.

[0049] The above specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery, characterized in that: The battery comprises: A shell (1), the shell (1) comprising a shell body (11) and a cover plate (12), the shell body (11) having a bottom wall (111), a first side wall (112) and a second side wall (113), the bottom wall (111) and the cover plate (12) being arranged opposite to each other, one of the two opposite sides of the first side wall (112) being connected to the bottom wall (111) and the other being connected to the second side wall (113), the angle between the first side wall (112) and the second side wall (113) being α, 90°<α<180°; A battery cell (2), the battery cell (2) being located in the housing (1), the battery cell (2) comprising a battery cell body (21) and a pole ear (22), the pole ear (22) being led out from at least one end of the battery cell body (21), the end face of the battery cell body (21) leading out from the pole ear (22) being a first end face, and an orthographic projection of a connection point between a first side wall (112) and a second side wall (113) on a plane where the first end face is located being located within the first end face; a blocking member (3), the blocking member (3) being at least partially located between the first end surface and a connection between the first side wall (112) and the second side wall (113); The area of ​​the orthographic projection of the blocking member (3) on the first end surface is S1, the area of ​​the first end surface is S2, and 0.6≤S1 / S2≤0.

95.

2. The battery according to claim 1, characterized in that The thickness of the connection between the first side wall (112) and the second side wall (113) is a, the direction perpendicular to the first end face is a first direction, and in the first direction, the thickness of the blocking member (3) is b, 0.15 mm 2 ≤a*b≤0.38mm 2 .

3. The battery according to claim 1, 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. In the first direction, the distance between the blocking member (3) and the first end face is c, 0.36 mm. 2 ≤b*c≤0.55 mm 2 .

4. The battery according to claim 1, 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, and 0.02≤d / t≤0.

4.

5. The battery according to claim 1, characterized in that The blocking member (3) is provided with a through hole (C), and the through hole (C) penetrates a side of the blocking member (3) close to the battery cell body (21) and a side away from the battery cell body (21).

6. The battery according to claim 1, 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, the thickness of the battery cell body (21) is e, and 0.01≤d / e≤0.

3.

7. The battery according to claim 1, 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.

8. The battery according to any one of claims 1 to 7, characterized in that: The shell body (11) has a third side wall (114); one of the two opposite sides of the third side wall (114) is connected to a side of the second side wall (113) away from the first side wall (112); the other side is folded outwardly of the shell body (11) to form a flange (115); the flange (115) is used for welding with the cover plate (12); the included angle between the second side wall (113) and the third side wall (114) is β, 90°≤β<120°; the first side wall (112), the second side wall (113), the third side wall (114) and the cover plate (12) are enclosed to form a receiving cavity (B); the electrode ear (22) extends from the battery cell body (21) into the receiving cavity (B).

9. The battery according to claim 8, characterized in that The battery further comprises an insulating support (4), wherein at least a portion of the insulating support (4) is located in the accommodating cavity (B); the blocking member (3) and the insulating support (4) are an integral structure, or the blocking member (3) and the insulating support (4) are separate structures, and the blocking member (3) is fixed to the insulating support (4).

10. The battery according to claim 9, characterized in that The insulating support (4) comprises an insulating seat (41), an insulating cover (42) and a flexible connecting portion (43); the insulating seat (41) is fixed to the cover plate (12); one of the two opposite sides of the insulating cover (42) is connected to the insulating seat (41) via the flexible connecting portion (43) so that the insulating cover (42) can be flipped relative to the insulating seat (41) to an open position or a closed position; the other side is connected to the blocking member (3); when the insulating cover (42) is located in the closed position, the pole ear (22) in the accommodating cavity (B) is located between the insulating cover (42) and the insulating seat (41).

11. The battery according to claim 10, characterized in that The insulating seat (41) has two supporting parts (411) and a seat plate (412) connected between the two supporting parts (411); when the insulating cover (42) is located in the closed position, the insulating cover (42) is clamped between the two supporting parts (411), and the pole lug (22) in the accommodating cavity (B) is located between the insulating cover (42) and the seat plate (412).

12. The battery according to claim 11, characterized in that The support portion (411) comprises a main body portion (4111) and an extension portion (4112); one of the two 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 located in the closed position, the insulating cover (42) is clamped between the two main bodies (4111), and the blocking member (3) abuts between the two extension portions (4112).

Images