battery

Abstract

The application relates to the technical field of batteries, and discloses a battery which comprises an explosion-proof valve and a battery shell, the explosion-proof valve is arranged in the battery shell, the explosion-proof valve comprises a first straight section, a second straight section and an intermediate section, the two ends of the intermediate section are connected with the first straight section and the second straight section respectively, the lengths of the first straight section and the second straight section are a and b respectively, the included angle between the first straight section and the second straight section is d, one end of the first straight section away from the intermediate section is a first end point, one end of the second straight section away from the intermediate section is a second end point, the line between the first end point and the second end point and the area enclosed by the first straight section, the second straight section and the intermediate section between the first end point and the second end point are e, at least one of the first straight section, the second straight section and the intermediate section can be broken, reliable explosion-proof effect is achieved, and the safety performance of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery. BACKGROUND

[0002] In the related art, the explosion-proof valve is used to realize the pressure relief protection in the battery. When the pressure in the battery is too high, the explosion-proof valve can be broken to make the gas in the battery discharge from the battery, thereby avoiding the safety problem.

[0003] However, the explosion-proof valve is mostly in the square patch type structure, and the problem of untimely explosion-proof or early explosion may occur in the use process. SUMMARY

[0004] The present application provides a battery to improve the performance of the battery.

[0005] The present application provides a battery, comprising an explosion-proof valve and a battery shell, the explosion-proof valve is arranged in the battery shell, the explosion-proof valve comprises a first straight line segment, a second straight line segment and an intermediate segment, two ends of the intermediate segment are connected with the first straight line segment and the second straight line segment respectively, at least one of the first straight line segment, the second straight line segment and the intermediate segment can be broken, the length of the first straight line segment and the second straight line segment is a and b respectively, the included angle between the first straight line segment and the second straight line segment is d, one end of the first straight line segment away from the intermediate segment is a first end point, one end of the second straight line segment away from the intermediate segment is a second end point, the line between the first end point and the second end point and the area enclosed by the first straight line segment, the second straight line segment and the intermediate segment between the first end point and the second end point together are e.

[0006] Wherein, 0.8≤a / b≤1.2, 45°≤d≤135°, 2 (degree / mm2) ≤d / e≤10 (degree / mm2).

[0007] The battery of the embodiment of the present application comprises an explosion-proof valve and a battery shell, the explosion-proof valve is arranged in the battery shell, so that when the pressure inside the battery shell reaches a preset value, the explosion-proof valve can be broken to achieve the explosion-proof effect. By arranging the explosion-proof valve as a first straight line segment, a second straight line segment and an intermediate segment, the two ends of the intermediate segment are connected with the first straight line segment and the second straight line segment respectively, the included angle between the first straight line segment and the second straight line segment is d, and the line between the first end point and the second end point and the area enclosed by the first straight line segment, the second straight line segment and the intermediate segment between the first end point and the second end point together are e. When the included angle between the first straight line segment and the second straight line segment is small, and the line between the first end point and the second end point and the area enclosed by the first straight line segment, the second straight line segment and the intermediate segment between the first end point and the second end point together are large, d / e is relatively small, so that the explosion-proof valve is not easy to break open. When the included angle between the first straight line segment and the second straight line segment is large, and the line between the first end point and the second end point and the area enclosed by the first straight line segment, the second straight line segment and the intermediate segment between the first end point and the second end point together are small, d / e is relatively large, so that the explosion-proof valve is easy to break open, the break open stress is difficult to control, and the problem of easy early break open is caused. By making 0.8≤a / b≤1.2, 45°≤d≤135°, 2 (degree / mm2) ≤d / e≤10 (degree / mm2), on the basis of ensuring that the explosion-proof valve can normally break open, the early break open of the explosion-proof valve can be avoided, so as to improve the safety performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to better understand the present disclosure, reference can be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements can be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components can have different settings as known in the art. Furthermore, in the drawings, the same reference numerals represent the same or similar components throughout the various drawings. Among them:

[0009] Figure 1 is a partial structural schematic diagram of a battery according to an exemplary embodiment;

[0010] Figure 2 is a structural schematic diagram of a battery from a first perspective according to an exemplary embodiment;

[0011] Figure 3 is a structural schematic diagram of a battery from a second perspective according to an exemplary embodiment;

[0012] Figure 4 is an exploded structural schematic diagram of a battery according to an exemplary embodiment;

[0013] Figure 5is a partial structural schematic diagram of a battery according to the first example embodiment;

[0014] Figure 6 is another partial structural schematic diagram of a battery according to the first example embodiment;

[0015] Figure 7 is a partial structural schematic diagram of a battery according to the second example embodiment.

[0016] The reference signs are explained as follows:

[0017] 10, explosion-proof valve; 11, first straight line segment; 111, first side wall; 112, second side wall; 113, first end point; 12, second straight line segment; 121, third side wall; 122, fourth side wall; 123, second end point; 13, intermediate segment; 131, fifth side wall; 132, sixth side wall; 133, first segment; 134, second segment; 135, third segment; 20, battery case; 21, first surface; 22, second surface; 23, liquid injection hole; 24, recess; 25, first case member; 26, second case member; 30, pole assembly; 40, battery cell; 41, battery cell main body; 42, tab portion. DETAILED DESCRIPTION

[0018] The technical solutions in the example embodiments of the present disclosure will be described clearly and completely in combination with the accompanying drawings of the example embodiments of the present disclosure. The example embodiments described herein are only for illustrative purposes, and are not intended to limit the protection scope of the present disclosure, and therefore it should be understood that various modifications and changes can be made to the example embodiments without departing from the protection scope of the present disclosure.

[0019] In the description of the present disclosure, unless explicitly specified and limited, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more; the term "and / or" includes any combination and all combinations of one or more associated listed items. In particular, referring to "the" object or "one" object is also intended to represent one of the possible multiple such objects.

[0020] Unless otherwise specified or explained, the terms "connection", "fixation" and the like should be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integrally connected, or electrically connected, or signal connected; "connection" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0021] Further, in the description of the present disclosure, it needs to be understood that the orientation words such as "upper", "lower", "inner", "outer" and the like described in the example embodiments of the present disclosure are described in the angle shown in the drawings, and should not be understood as the limitation of the example embodiments of the present disclosure. It also needs to be understood that in the context, when referring to one element or feature connected to another element (one or more) "on", "under", or "inner", "outer", it can not only be directly connected to another element (one or more) "on", "under", or "inner", "outer", but also indirectly connected to another element (one or more) "on", "under", or "inner", "outer" through an intermediate element.

[0022] One embodiment of the present application provides a battery, please refer to Figures 1 to 7 , the battery includes an explosion-proof valve 10 and a battery shell 20, the explosion-proof valve 10 is arranged in the battery shell 20, the explosion-proof valve 10 includes a first straight line segment 11, a second straight line segment 12 and an intermediate segment 13, both ends of the intermediate segment 13 are connected to the first straight line segment 11 and the second straight line segment 12 respectively, the length of the first straight line segment 11 and the second straight line segment 12 is a and b respectively, the included angle between the first straight line segment 11 and the second straight line segment 12 is d, the end of the first straight line segment 11 away from the intermediate segment 13 is the first end point 113, the end of the second straight line segment 12 away from the intermediate segment 13 is the second end point 123, the line between the first end point 113 and the second end point 123 and the area enclosed by the first straight line segment 11, the second straight line segment 12 and the intermediate segment 13 between the first end point 113 and the second end point 123 are e; wherein 0.8≤a / b≤1.2, 45°≤d≤135°, 2 (degree / square millimeter) ≤d / e≤10 (degree / square millimeter), when the internal pressure of the battery shell 20 reaches a preset value, at least one of the first straight line segment 11, the second straight line segment 12 and the intermediate segment 13 can be broken.

[0023] The battery of one embodiment of the present application includes an explosion-proof valve 10 and a battery shell 20, the explosion-proof valve 10 is arranged in the battery shell 20, so that when the internal pressure of the battery shell 20 reaches a preset value, the explosion-proof valve 10 can be broken to achieve the explosion-proof effect. By setting the explosion-proof valve 10 as a first straight line segment 11, a second straight line segment 12 and an intermediate segment 13, both ends of the intermediate segment 13 are connected to the first straight line segment 11 and the second straight line segment 12 respectively, the included angle between the first straight line segment 11 and the second straight line segment 12 is d, the line between the first end point 113 and the second end point 123 and the area enclosed by the first straight line segment 11, the second straight line segment 12 and the intermediate segment 13 between the first end point 113 and the second end point 123 are e, by 0.8≤a / b≤1.2, 45°≤d≤135°, 2 (degree / square millimeter) ≤d / e≤10 (degree / square millimeter), on the basis of ensuring that the explosion-proof valve can be normally broken, the explosion-proof valve can be prevented from being broken too early, so as to improve the safety performance of the battery

[0024] It should be noted that the explosion-proof valve 10 includes the first straight section 11, the second straight section 12 and the intermediate section 13, the first straight section 11 can extend along the first straight direction, and the second straight section 12 can extend along the second straight direction. When the internal pressure of the battery shell 20 reaches the preset value, at least one of the first straight section 11, the second straight section 12 and the intermediate section 13 can be broken, that is, the first straight section 11, the second straight section 12 and the intermediate section 13 can be considered as the weak area of the explosion-proof valve 10, so as to achieve the explosion-proof effect, so as to timely discharge the gas in the battery shell 20, and avoid causing safety problems.

[0025] In combination with Figure 6 As shown in the figure, the lengths of the first straight section 11 and the second straight section 12 are a and b respectively, the included angle between the first straight section 11 and the second straight section 12 is d, the line between the first end point 113 and the second end point 123 and the area jointly enclosed by the first straight section 11, the second straight section 12 and the intermediate section 13 between the first end point 113 and the second end point 123 are e, 0.8≤a / b≤1.2, 45°≤d≤135°, 2(° / mm2)≤d / e≤10(° / mm2), so as to effectively control the stress distribution at the explosion-proof valve 10, so as to ensure that the explosion-proof valve 10 can be broken when the internal pressure of the battery shell 20 reaches the preset value.

[0026] The length of the first straight section 11 is a, the length of the second straight section 12 is b, 0.8≤a / b≤1.2, so that the length of the first straight section 11 and the length of the second straight section 12 are basically consistent, the intermediate section 13 in the middle and the first straight section 11 and the second straight section 12 between the two ends form a symmetrical structure, the stress on the intermediate section 13 is uniform, the intermediate section 13 can be broken under a certain pressure, the stress concentration in the first straight section 11 and the second straight section 12 is easy to realize, so as to facilitate the explosion of the explosion-proof valve 10, and effectively improve the safety performance of the battery.

[0027] The included angle between the first straight section 11 and the second straight section 12 is d, 45°≤d≤135°, while realizing stress concentration, the stress can be avoided to be too large and uncontrollable, so as to ensure that the explosion-proof valve 10 is broken when the internal pressure of the battery shell 20 reaches the preset value, so as to release the internal pressure of the battery shell 20, and ensure the safety performance of the battery.

[0028] When the included angle between the first straight segment 11 and the second straight segment 12 is small, and the area enclosed by the line between the first end point 113 and the second end point 123 and the first straight segment 11, the second straight segment 12 and the intermediate segment 13 between the first end point 113 and the second end point 123 is large, d / e is relatively small, so that the explosion valve 10 is not prone to explosion. When the included angle between the first straight segment 11 and the second straight segment 12 is large, and the area enclosed by the line between the first end point 113 and the second end point 123 and the first straight segment 11, the second straight segment 12 and the intermediate segment 13 between the first end point 113 and the second end point 123 is small, d / e is relatively large, so that the explosion valve 10 is prone to explosion, and the explosion stress is difficult to control, and the explosion may occur prematurely. In the embodiment, the area enclosed by the line between the first end point 113 and the second end point 123 and the first straight segment 11, the second straight segment 12 and the intermediate segment 13 between the first end point 113 and the second end point 123 is e, and 2 (degree / mm2) ≤ d / e ≤ 10 (degree / mm2), so that the size of stress concentration can be effectively controlled, and the explosion of the explosion valve 10 can be avoided, so as to ensure that the explosion valve 10 is exploded when the pressure in the battery shell 20 reaches the preset value, so as to release the pressure in the battery shell 20, and thus ensure the safety performance of the battery.

[0029] The area enclosed by the line between the first end point 113 and the second end point 123 and the first straight segment 11, the second straight segment 12 and the intermediate segment 13 between the first end point 113 and the second end point 123 is e, that is, as shown in FIG. 1, the line between the first end point 113 and the second end point 123 is a straight line shown in the figure, and the first straight segment 11, the second straight segment 12 and the intermediate segment 13 between the first end point 113 and the second end point 123 can be a connecting line formed by the inner wall surface of the first straight segment 11, the second straight segment 12 and the intermediate segment 13 towards the line between the first end point 113 and the second end point 123, and the area enclosed between the straight line and the connecting line is e. Figure 6

[0030] In one embodiment, the ratio between the length a of the first straight segment 11 and the length b of the second straight segment 12 can be 0.8, 0.85, 0.9, 0.95, 0.98, 1, 1.05, 1.1, 1.15 or 1.2, etc.

[0031] In one embodiment, the included angle d between the first straight segment 11 and the second straight segment 12 can be 45°, 48°, 50°, 55°, 58°, 60°, 65°, 70°, 75°, 78°, 80°, 85°, 88°, 90°, 95°, 100°, 105°, 110°, 120°, 125°, 130°, 132° or 135°, etc. ​

[0032] In one embodiment, the ratio between the angle d between the first straight line segment 11 and the second straight line segment 12 and the area e enclosed by the line between the first end point 113 and the second end point 123 and the first straight line segment 11, the second straight line segment 12 and the intermediate segment 13 between the first end point 113 and the second end point 123 can be 2 (degree / square millimeter), 3 (degree / square millimeter), 4 (degree / square millimeter), 5 (degree / square millimeter), 6 (degree / square millimeter), 7 (degree / square millimeter), 8 (degree / square millimeter), 9 (degree / square millimeter) or 10 (degree / square millimeter) and so on.

[0033] In one embodiment, the intermediate segment 13 comprises a curved segment, so as to reduce stress concentration, thereby ensuring that the burst pressure of the explosion-proof valve 10 is controllable and the problem of false burst does not occur. The curved segment can be a circular arc segment, or the curved segment can be a non-circular arc segment.

[0034] In one embodiment, the first straight line segment 11 and the curved segment are connected, and / or the second straight line segment 12 and the curved segment are connected, so as to avoid stress concentration at the connection points between the first straight line segment 11 and the intermediate segment 13 and the connection points between the second straight line segment 12 and the intermediate segment 13, thereby effectively controlling the burst pressure of the explosion-proof valve 10, so as to improve the safety performance of the battery.

[0035] In one embodiment, as shown in FIGS. 1-3, the first straight line segment 11 and the second straight line segment 12 are connected to the intermediate segment 13, and the first straight line segment 11 and the second straight line segment 12 are not connected to each other. Figure 5 and Figure 6 In one embodiment, the intermediate segment 13 is a circular arc segment, which not only avoids stress concentration at the connection points between the first straight line segment 11 and the intermediate segment 13 and the connection points between the second straight line segment 12 and the intermediate segment 13, but also achieves uniform distribution of stress, thereby achieving controllable burst pressure of the explosion-proof valve 10.

[0036] In one embodiment, 1 mm≤a≤50 mm, 1 mm≤b≤50 mm, by controlling the length of the first straight line segment 11 and the length of the second straight line segment 12 to be between 1 mm and 50 mm, not only can the stress concentration in the first straight line segment 11 and the second straight line segment 12 be easily achieved, but also can the first straight line segment 11 and the second straight line segment 12 be ensured to burst at the preset pressure.

[0037] The smaller the length of the first straight line segment 11 and the length of the second straight line segment 12, the larger the proportion of the intermediate segment 13 of the entire explosion-proof valve 10, so the first straight line segment 11 and the second straight line segment 12 are difficult to play a role in stress concentration. The larger the length of the first straight line segment 11 and the length of the second straight line segment 12, the more concentrated the stress of the entire explosion-proof valve 10, so the explosion-proof valve 10 fails to burst at the preset pressure, affecting the normal use of the battery.

[0038] In one embodiment, the length of the first straight section 11 can be 1 mm, 1.5 mm, 2 mm, 3 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 28 mm, 30 mm, 35 mm, 40 mm, 45 mm, 48 mm, 49 mm, or 50 mm, etc. The length of the second straight section 12 can be 1 mm, 1.5 mm, 2 mm, 3 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 28 mm, 30 mm, 35 mm, 40 mm, 45 mm, 48 mm, 49 mm, or 50 mm, etc.

[0039] In one embodiment, the width of the first straight section 11 is in the range of 0.1 mm to 1 mm, the width of the second straight section 12 is in the range of 0.1 mm to 1 mm, and the width of the intermediate section 13 is in the range of 0.1 mm to 1 mm, so that at least one of the first straight section 11, the second straight section 12, and the intermediate section 13 can be broken at a preset pressure, and the structural strength is relatively high, and the problem of false explosion of the explosion-proof valve 10 when the internal pressure of the battery is not higher than the preset value does not occur.

[0040] The first straight section 11, the second straight section 12, and the intermediate section 13 can all be understood as weak structures that burst when the internal pressure of the battery housing 20 reaches a preset value, and the first straight section 11, the second straight section 12, and the intermediate section 13 can have a certain width value, which facilitates bursting while also enabling rapid gas discharge from the inside of the battery housing 20, thereby avoiding safety problems. The width of the first straight section 11 is in the range of 0.1 mm to 1 mm, the width of the second straight section 12 is in the range of 0.1 mm to 1 mm, and the width of the intermediate section 13 is in the range of 0.1 mm to 1 mm, which not only ensures that the explosion-proof valve 10 bursts, enabling rapid gas discharge after bursting, but also ensures that the first straight section 11, the second straight section 12, and the intermediate section 13 have a certain structural strength.

[0041] In one embodiment, the width of the first straight section 11 can be 0.1 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.48 mm, 0.5 mm, 0.52 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, or 1 mm, etc.

[0042] The width of the second straight section 12 can be 0.1 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.48 mm, 0.5 mm, 0.52 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, or 1 mm, etc.

[0043] The width of the intermediate section 13 can be 0.1 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.48 mm, 0.5 mm, 0.52 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, or 1 mm, etc.

[0044] In one embodiment, as shown in Figure 2 and Figure 3 The battery shell 20 includes two opposite first surfaces 21 and four second surfaces 22 arranged around the first surfaces 21; the explosion-proof valve 10 is arranged at the corner region of the first surface 21, and the minimum vertical distance between the explosion-proof valve 10 and the second surface 22 adjacent thereto is less than 20 mm, so that the explosion-proof valve 10 can be positioned as close as possible to the edge of the battery shell 20, thereby avoiding as much as possible the spraying of gas and liquid in the battery shell 20 towards the adjacent battery after the explosion-proof valve 10 is opened, thereby improving the safety performance of the battery.

[0045] The corner region of the first surface 21 can be understood as the position region at the two ends of the diagonal line of the first surface 21. The first surface 21 can be a substantially rectangular surface, and in this case, the first surface 21 can have four corner regions.

[0046] The minimum vertical distance between the explosion-proof valve 10 and the second surface 22 adjacent thereto is less than 20 mm, i.e., the minimum distance between the side of the explosion-proof valve 10 close to the second surface 22 and the second surface 22 needs to be less than 20 mm, so that the explosion-proof valve 10 can be positioned as close as possible to the circumferential outer edge of the battery shell 20, i.e., the explosion-proof valve 10 can be positioned as close as possible to the second surface 22, thereby reasonably arranging the position of the explosion-proof valve 10 and reducing the probability of spraying of gas and liquid in the battery shell 20 towards the adjacent battery after the explosion-proof valve 10 is opened.

[0047] In one embodiment, as shown in Figures 5 to 7As shown, at least part of the intermediate section 13 is protruded towards the corner of two second surfaces 22 adjacent to it, i.e. at least part of the intermediate section 13 is arranged close to the circumferential edge of the first surface 21, so that the distance between the intermediate section 13 and the corner area of the circumferential edge of the first surface 21 can be relatively small.

[0048] In one embodiment, at least part of the intermediate section 13 is protruded away from the corner of two second surfaces 22 adjacent to it, i.e. at least part of the intermediate section 13 is arranged away from the circumferential edge of the first surface 21, so as to control the distance value between the intermediate section 13 and the circular arc transition section, thereby controlling the burst pressure of the explosion-proof valve 10. The corner of the two second surfaces 22 can be considered as the transition area of the two adjacent second surfaces 22.

[0049] In one embodiment, the battery shell 20 comprises two opposite first surfaces 21 and four second surfaces 22 arranged around the first surface 21; wherein the explosion-proof valve 10 is arranged at the corner area of the first surface 21, the first straight section 11 and the second straight section 12 are respectively parallel to two adjacent second surfaces 22, further, the first straight section 11 is generally parallel to the second surface 22 adjacent to it, and the second straight section 12 is generally parallel to the second surface 22 adjacent to it, so that the distance between the first straight section 11 and one second surface 22 is consistent, and the distance between the second straight section 12 and another second surface 22 is consistent, so that the stress can be easily concentrated, thereby making the explosion-proof valve 10 easily burst, thereby improving the safety performance of the battery.

[0050] In one embodiment, as shown in FIG. 1, the first straight section 11 and the second straight section 12 are respectively parallel to two adjacent second surfaces 22, further, the first straight section 11 is generally parallel to the second surface 22 adjacent to it, and the second straight section 12 is generally parallel to the second surface 22 adjacent to it, so that the distance between the first straight section 11 and one second surface 22 is consistent, and the distance between the second straight section 12 and another second surface 22 is consistent, so that the stress can be easily concentrated, thereby making the explosion-proof valve 10 easily burst, thereby improving the safety performance of the battery. Figures 5 to 7 As shown, at least part of the intermediate section 13 is protruded towards the corner of two second surfaces 22 adjacent to it, i.e. at least part of the intermediate section 13 is arranged close to the circumferential edge of the first surface 21, so that the distance between the intermediate section 13 and the corner area of the circumferential edge of the first surface 21 can be relatively small.

[0051] It should be noted that the basic, substantially, in the embodiment appears in the result obtained in the case of considering the processing error, installation error and so on, for example, the first straight line segment 11 is substantially parallel to the second surface 22 adjacent to it, the second straight line segment 12 is substantially parallel to the second surface 22 adjacent to it, when ignoring the processing error, installation error and so on, it can be considered that the first straight line segment 11 is parallel to the second surface 22 adjacent to it, the second straight line segment 12 is parallel to the second surface 22 adjacent to it. In some embodiments, it is not excluded that there is a certain angle between the first straight line segment 11 and the second surface 22 adjacent to it, for example, the angle between the first straight line segment 11 and the second surface 22 adjacent to it ranges from 0 degree to 15 degrees. There is a certain angle between the second straight line segment 12 and the second surface 22 adjacent to it, for example, the angle between the second straight line segment 12 and the second surface 22 adjacent to it ranges from 0 degree to 15 degrees.

[0052] In one embodiment, the battery shell 20 includes two opposite first surfaces 21 and four second surfaces 22 arranged around the first surface 21; wherein the area of the first surface 21 is larger than the area of the second surface 22, and the explosion-proof valve 10 is arranged on the first surface 21, so that the first surface 21 can provide a reliable support surface for the explosion-proof valve 10, and the explosion-proof valve 10 can be conveniently arranged, thereby improving the safety protection performance of the explosion-proof valve 10.

[0053] It should be noted that the two opposite first surfaces 21 are large surfaces of the battery shell 20, and the four second surfaces 22 are small surfaces of the battery shell 20, the four second surfaces 22 include two pairs of small surfaces, i.e. a first pair of small surfaces extending along the length direction of the battery shell 20, and a second pair of small surfaces extending along the width direction of the battery shell 20, and the area of the first pair of small surfaces is larger than the area of the second pair of small surfaces, but both are smaller than the area of the large surface.

[0054] It should be noted that the explosion-proof valve 10 can include a weak part, and the weak part can be composed of the first straight line segment 11, the second straight line segment 12 and the intermediate segment 13, so that the explosion-proof valve 10 can be basically opened by the first straight line segment 11, the second straight line segment 12 and the intermediate segment 13, thereby meeting the explosion-proof requirement and achieving the pressure relief effect.

[0055] In one embodiment, the explosion-proof valve 10 is provided with a first notch, a second notch and a third notch, so that the explosion-proof valve 10 is formed with a first straight line segment 11, a second straight line segment 12 and an intermediate segment 13, i.e. by providing the explosion-proof valve 10 with a first notch, a second notch and a third notch, thereby realizing the thinning treatment of the explosion-proof valve 10, forming a weak part, thereby meeting the explosion-proof requirement and achieving the pressure relief effect.

[0056] The explosion-proof valve 10 and the battery shell 20 can be separately arranged, that is, the first, second and third notches are formed on the explosion-proof valve 10, and the weak part of the explosion-proof valve 10 can be composed of the first, second and third straight line segments 11, 12 and 13.

[0057] The explosion-proof valve 10 and the battery shell 20 can be integrally formed, that is, the first, second and third notches are formed on the battery shell 20. By arranging the first, second and third notches on the battery shell 20, the battery shell 20 is thinned to form a weak part, thereby meeting the explosion-proof requirement and achieving the pressure relief effect. The weak part of the explosion-proof valve 10 can be composed of the first, second and third straight line segments 11, 12 and 13.

[0058] In one embodiment, in combination with Figure 5 and Figure 6 As shown in the drawings, the first notch includes opposite first and second side walls 111 and 112, the second notch includes opposite third and fourth side walls 121 and 122, and the third notch includes opposite fifth and sixth side walls 131 and 132. The first, second, third and fourth side walls 111, 112, 121 and 122 are all planar. The fifth side wall 131 has two ends connected to the first and third side walls 111 and 121, respectively, and the sixth side wall 132 has two ends connected to the second and fourth side walls 112 and 122, respectively. The lengths of the first and third side walls 111 and 121 are a and b, respectively, and the included angle between the first and third side walls 111 and 121 is d. The lengths of the second and fourth side walls 112 and 122 are a and b, respectively, and the included angle between the second and fourth side walls 112 and 122 is d.

[0059] Taking the case where the explosion-proof valve 10 and the battery shell 20 are integrally formed, the battery shell 20 is provided with the first, second and third notches to form the first, second and third straight line segments 11, 12 and 13, respectively. Therefore, the shapes of the first, second and third notches directly determine the shapes of the first, second and third straight line segments 11, 12 and 13.

[0060] The lengths of the first and second straight line segments 11 and 12 can be equal to the lengths of the first and third side walls 111 and 121, respectively, and the included angle between the first and second straight line segments 11 and 12 can be equal to the included angle between the first and third side walls 111 and 121.

[0061] Alternatively, the lengths of the first straight section 11 and the second straight section 12 can be equal to the lengths of the second side wall 112 and the fourth side wall 122 respectively, and the included angle between the first straight section 11 and the second straight section 12 can be equal to the included angle between the second side wall 112 and the fourth side wall 122.

[0062] Alternatively, the length of the first straight section 11 can be equal to the length of the center line between the first side wall 111 and the second side wall 112, the length of the second straight section 12 can be equal to the length of the center line between the third side wall 121 and the fourth side wall 122, and the included angle between the first straight section 11 and the second straight section 12 can be equal to the included angle between the center line between the first side wall 111 and the second side wall 112 and the center line between the third side wall 121 and the fourth side wall 122.

[0063] In one embodiment, as shown in Figure 7 The intermediate section 13 includes a first section 133, a second section 134, and a third section 135, two ends of the third section 135 are connected to the first section 133 and the second section 134 respectively, and the first section 133 and the second section 134 are connected to the first straight section 11 and the second straight section 12 respectively; wherein the first section 133 and the second section 134 are both circular arc sections, and the third section 135 is a straight section, so as to ensure that the first straight section 11 and the third section 135 are connected through a circular arc section, and the second straight section 12 and the third section 135 are connected through a circular arc section, so as to avoid excessive stress concentration, and realize that the explosion-proof valve 10 can be opened while the explosion pressure of the explosion-proof valve 10 is controllable.

[0064] In one embodiment, as shown in Figure 1 and Figure 2 The explosion-proof valve 10 is at least two, and the at least two explosion-proof valves 10 are located on the same side of the battery shell 20, and further, the at least two explosion-proof valves 10 are located on the same surface of the battery shell 20, so as to improve the explosion-proof performance of the explosion-proof valve 10, avoid the problem that one explosion-proof valve 10 cannot be opened to cause the battery safety problem, and further, the at least two explosion-proof valves 10 are arranged on the same side of the battery shell 20, so as to facilitate controlling the injection direction of the gas and liquid in the battery shell 20 after the explosion-proof valve 10 is opened, so as to improve the safety performance of the battery.

[0065] In one embodiment, as shown in Figure 4As shown, the battery further includes a pole assembly 30 and a cell 40, the cell 40 is arranged in the battery case 20, the pole assembly 30 is arranged in the battery case 20, and the pole assembly 30 is connected with the cell 40; wherein the pole assembly 30 is arranged apart from the explosion-proof valve 10, and the pole assembly 30 and the explosion-proof valve 10 are arranged along the width direction of the battery case 20, which not only facilitates the subsequent connection of the pole assembly 30 and the busbar, but also makes full use of the space of the battery case 20, so as to ensure that the internal structure of the battery case 20, such as the cell 40, can be reasonably arranged, thereby improving the space utilization rate of the battery case 20.

[0066] The pole assembly 30 and the explosion-proof valve 10 can be located at the end of the battery case 20, and the explosion-proof valve 10 is located at the corner position of the battery case 20, for example, the pole assembly 30 and the explosion-proof valve 10 can be arranged on the first surface 21, considering that the first surface 21 is a large surface of the battery case 20, so that sufficient support can be provided for the pole assembly 30, so as to ensure the stability of the pole assembly 30.

[0067] In one embodiment, as shown in the drawings, Figure 4 The cell 40 includes a cell body 41 and a tab portion 42, the tab portion 42 extends from the length direction of the cell body 41; wherein the tab portion 42 is connected with the pole assembly 30, at this time the pole assembly 30 can be arranged at the end of the battery case 20, so as to facilitate the connection and make full use of the length space of the battery. Wherein the tab portion 42 and the pole assembly 30 can be directly connected, that is, the tab portion 42 and the pole assembly 30 can be directly welded, or the tab portion 42 and the pole assembly 30 can be connected through a metal adapter piece, the specific connection mode can be welding, and it is also not excluded that riveting and other modes are used, which is not limited here.

[0068] It should be noted that the cell body 41 includes two or more pole pieces, the tab portion 42 includes two or more single tabs, and the single tabs respectively extend from the corresponding pole pieces, the width of the single tab is less than the width of the pole piece, and the plurality of single tabs are stacked to form the tab portion 42 and are connected with the pole assembly 30, wherein the tab portion 42 can be welded with the pole assembly 30. Wherein the single tab is made of a metal foil with good electrical conductivity and thermal conductivity, for example, aluminum, copper or nickel, etc.

[0069] In some embodiments, the pole assembly 30 is two, and the two pole assemblies 30 are respectively a positive pole assembly and a negative pole assembly, each pole assembly 30 can include two pole columns for increasing the overcurrent capacity of the battery, and the tab portion 42 is also two, and the two tab portions 42 are respectively a positive tab and a negative tab, the positive pole assembly and the positive tab are connected, and the negative pole assembly and the negative tab are connected.

[0070] It should be noted that the pole assembly 30 and the battery shell 20 can be insulated, for example, an insulating member can be used for insulation, or an insulating coating can be used for insulation, which is not limited here, and can be selected according to actual needs. In some embodiments, it is not excluded that one pole assembly 30 can be electrically connected with the battery shell 20.

[0071] In one embodiment, as shown in Figure 1 and Figure 2 , the battery shell 20 is provided with a liquid injection hole 23, the liquid injection hole 23 is spaced apart from the pole assembly 30, and the pole assembly 30 is located between the explosion-proof valve 10 and the liquid injection hole 23, thereby improving the space utilization rate of the battery shell 20, and reasonably arranging the pole assembly 30, the explosion-proof valve 10 and the liquid injection hole 23.

[0072] The liquid injection hole 23 is used to realize liquid injection into the inside of the battery shell 20, and can be sealed by a sealing structure after the liquid injection is completed. The liquid injection hole 23 can be at least two, and the at least two liquid injection holes 23 can be symmetric about the intersection center of the first diagonal direction and the second diagonal direction of the battery shell 20.

[0073] In one embodiment, the battery shell 20 is provided with a recess 24, and the pole assembly 30 is located in the recess 24, so that the pole assembly 30 can avoid occupying the battery stack space, thereby improving the energy density of the battery pack.

[0074] In one embodiment, as shown in Figure 2 and Figure 3 , the battery shell 20 is provided with a recess 24, and the pole assembly 30 and the recess 24 are located on the opposite two surfaces of the battery shell 20, respectively, and the recess 24 is used to accommodate the pole assembly of another battery, so that when the battery is grouped, the pole assembly of another battery can be accommodated in the recess 24, thereby avoiding the pole assembly occupying the space between two batteries, reducing the distance between adjacent two batteries, and thereby improving the energy density of the battery group.

[0075] In one embodiment, as shown in Figure 2 and Figure 3 , the pole assembly 30 can be two, and the recess 24 can be two, the two pole assemblies 30 can be arranged on a first surface 21, and the two recesses 24 can be arranged on another first surface 21.

[0076] In one embodiment, as shown in Figure 4As shown, the battery housing 20 comprises: a first housing piece 25; a second housing piece 26 connected with the first housing piece 25 to enclose the battery cell 40; wherein the first housing piece 25 is a flat plate, and the pole assembly 30 and the explosion-proof valve 10 are both arranged on the first housing piece 25, which not only has a simple structure, but also facilitates the arrangement of the pole assembly 30 and the explosion-proof valve 10, thereby improving the forming efficiency of the battery.

[0077] In one embodiment, the material of the battery housing 20 can be stainless steel or aluminum, which has good corrosion resistance and sufficient strength.

[0078] It should be noted that the first housing piece 25 and the second housing piece 26 can be independently arranged, as shown in Figure 4 In some embodiments, it is not excluded that the first housing piece 25 and the second housing piece 26 can be an integral structure, which forms a space for accommodating the battery cell 40 by stamping, and then is closed and connected by welding.

[0079] In one embodiment, the thickness of the battery housing 20 is 0.1mm-0.5mm, so as to reduce the weight of the battery housing 20, thereby improving the energy density of the battery. The thickness of the first housing piece 25 and the second housing piece 26 is 0.1mm-0.5mm. The thickness of the battery housing 20 is relatively thin, and in this embodiment, the explosion-proof valve 10 can be directly arranged on the battery housing 20, thereby facilitating the forming.

[0080] The thickness of the battery housing 20 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm, etc.

[0081] In one embodiment, the length of the battery is L, 400mm≤L≤2500mm, the width of the battery is K, and the height of the battery is H, 2K≤L≤50K, and / or, 0.5H≤K≤20H.

[0082] Further, 50mm≤K≤200mm, 10mm≤H≤100mm.

[0083] Preferably, 4K≤L≤25K, and / or, 2H≤K≤10H.

[0084] The battery in the above embodiments has a relatively large ratio of the length to the width of the battery, and further has a relatively large ratio of the width to the height of the battery, while ensuring sufficient energy density.

[0085] In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. In one embodiment, the length of the battery is L, and the width of the battery is K, 4K≤L≤7K, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack. <000020

[0086] In one embodiment, the height of the battery is H, where 3H≤K≤7H. The ratio of the battery width to its height is relatively large, which facilitates its formation while ensuring sufficient energy density.

[0087] Optionally, the battery length can be 500mm-1500mm, the battery width can be 80mm-150mm, and the battery height can be 15mm-25mm.

[0088] It should be noted that the length of the battery is the dimension along its length, the width of the battery is the dimension along its width, and the height of the battery is the dimension along its height, i.e., the thickness of the battery.

[0089] In one embodiment, the battery is a stacked battery, which is not only convenient to assemble, but also allows for the processing of batteries with longer lengths.

[0090] A battery consists of a cell and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging and discharging. A cell is a unit formed by winding or laminating stacked portions, including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarities of the first and second electrodes can be interchanged.

[0091] Specifically, the cell 40 is a stacked cell, which has a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator between the first electrode and the second electrode, so that multiple pairs of first electrodes and second electrodes are stacked to form a stacked cell.

[0092] Optionally, the battery can be a wound battery, which involves winding a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator disposed between the first and second electrodes to obtain a wound battery cell.

[0093] An embodiment of the present invention also provides a battery pack comprising the aforementioned battery.

[0094] An embodiment of the present invention provides a battery pack comprising an explosion-proof valve 10 and a battery housing 20. The explosion-proof valve 10 is disposed within the battery housing 20, such that when the internal pressure of the battery housing 20 reaches a preset value, the explosion-proof valve 10 can be ruptured to achieve an explosion-proof function. The explosion-proof valve 10 is configured as a first straight segment 11, a second straight segment 12, and an intermediate segment 13. The two ends of the intermediate segment 13 are respectively connected to the first straight segment 11 and the second straight segment 12. The included angle between the first straight segment 11 and the second straight segment 12 is d. The area enclosed by the line connecting the first endpoint 113 and the second endpoint 123, and the first straight segment 11, the second straight segment 12, and the intermediate segment 13 between the first endpoint 113 and the second endpoint 123 is e. The parameters are: 0.8 ≤ a / b ≤ 1.2, 45° ≤ d ≤ 135°, and 2 (degrees / square meter). The stress distribution at the explosion-proof valve 10 can be effectively controlled by the pressure distribution (d / e ≤ 10 mm²), thereby ensuring that at least one of the first straight section 11, the second straight section 12, and the middle section 13 of the explosion-proof valve 10 can burst open when the internal pressure of the battery casing 20 reaches a preset value, thus achieving a reliable explosion-proof effect and improving the safety performance of the battery pack. At the same time, it prevents the pressure of the entire explosion-proof valve 10 from being too concentrated, which would cause the explosion-proof valve 10 to burst prematurely. In other words, it can ensure that the explosion-proof valve 10 will not burst accidentally when the internal pressure of the battery is not higher than the preset value.

[0095] In one embodiment, the battery pack is a battery module or a battery pack.

[0096] The battery module includes multiple batteries, and may also include end plates and side plates for fixing the multiple batteries.

[0097] It should be noted that multiple batteries can be assembled into a battery module and then installed inside the battery box. These batteries can be secured using end plates and side plates. Alternatively, multiple batteries can be directly installed inside the battery box without needing to be grouped together; in this case, the end plates and side plates can be removed.

[0098] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0099] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized by, The application relates to a battery shell (20) comprising an explosion-proof valve (10) arranged on the battery shell (20), the explosion-proof valve (10) comprising a first straight section (11), a second straight section (12) and an intermediate section (13), two ends of the intermediate section (13) being connected to the first straight section (11) and the second straight section (12) respectively, at least one of the first straight section (11), the second straight section (12) and the intermediate section (13) being capable of being broken, the length of the first straight section (11) and the second straight section (12) being a and b respectively, the included angle between the first straight section (11) and the second straight section (12) being d, one end of the first straight section (11) away from the intermediate section (13) being a first end point (113), one end of the second straight section (12) away from the intermediate section (13) being a second end point (123), the line between the first end point (113) and the second end point (123) and the area enclosed by the first straight section (11), the second straight section (12) and the intermediate section (13) between the first end point (113) and the second end point (123) together forming e; wherein 0.8<=a / b<=1.2, 1mm<=a<=50mm, 45<=d<=135, 2degree / square millimeter<=d / e<=10degree / square millimeter; The battery shell (20) comprises two opposite first surfaces (21) and four second surfaces (22) arranged around the first surfaces (21), the explosion-proof valve (10) being arranged at the corner region of the first surfaces (21); at least part of the intermediate section (13) is arranged protruding towards the corner between two second surfaces (22) adjacent to the intermediate section (13), or at least part of the intermediate section (13) is arranged protruding away from the corner between two second surfaces (22) adjacent to the intermediate section (13); the vertical distance between the explosion-proof valve (10) and the second surface (22) adjacent to the explosion-proof valve (10) is less than 20mm.

2. The battery of claim 1, wherein, The intermediate section (13) comprises a curved section.

3. The battery of claim 2, wherein, The first straight section (11) is connected to the curved section, and / or the second straight section (12) is connected to the curved section.

4. The battery of claim 1, wherein, The width of the first straight section (11) ranges from 0.1mm to 1mm, the width of the second straight section (12) ranges from 0.1mm to 1mm, and the width of the intermediate section (13) ranges from 0.1mm to 1mm.

5. The battery of claim 1, wherein, The area of the first surface (21) is greater than the area of the second surface (22).

6. The battery of claim 5, wherein, The first straight section (11) is substantially parallel to the second surface (22) adjacent to the first straight section (11), and the second straight section (12) is substantially parallel to the second surface (22) adjacent to the second straight section (12). At least part of the intermediate section (13) is arranged protruding towards the circumferential edge of the first surface (21).

7. The battery of claim 1, wherein, The explosion-proof valve (10) is provided with a first notch, a second notch and a third notch, so that the explosion-proof valve (10) forms the first straight line segment (11), the second straight line segment (12) and the intermediate segment (13).

8. The battery of claim 7, wherein, The first notch comprises opposite first and second side walls (111) and (112), the second notch comprises opposite third and fourth side walls (121) and (122), and the third notch comprises opposite fifth and sixth side walls (131) and (132), wherein the first, second, third and fourth side walls (111), (112), (121) and (122) are all planar. The two ends of the fifth side wall (131) are connected to the first and third side walls (111) and (121), respectively, and the two ends of the sixth side wall (132) are connected to the second and fourth side walls (112) and (122), respectively, the lengths of the first and third side walls (111) and (121) are a and b, respectively, the included angle between the first and third side walls (111) and (121) is d, and / or the lengths of the second and fourth side walls (112) and (122) are a and b, respectively, and the included angle between the second and fourth side walls (112) and (122) is d.

9. The battery of any one of claims 1-8, wherein, The explosion-proof valve (10) is at least two, and at least two explosion-proof valves (10) are located on the same surface of the battery shell (20).

10. The battery of any one of claims 1 to 8, wherein, The battery further comprises a pole assembly (30) and a cell (40), the cell (40) is arranged in the battery shell (20), and the pole assembly (30) is arranged in the battery shell (20) and connected with the cell (40). The pole assembly (30) and the explosion-proof valve (10) are arranged in the width direction of the battery shell (20).

11. The battery of claim 10, wherein, The battery shell (20) is provided with a liquid injection hole (23), the liquid injection hole (23) is arranged apart from the pole assembly (30), and the pole assembly (30) is located between the explosion-proof valve (10) and the liquid injection hole (23).

12. The battery of claim 10, wherein, The battery shell (20) is provided with a recess (24), the pole assembly (30) is located in the recess (24), or the pole assembly (30) and the recess (24) are located on opposite surfaces of the battery shell (20), respectively, and the recess (24) is used for accommodating the pole assembly of another battery.

13. The battery of claim 10, wherein, The battery shell (20) comprises: a first shell member (25); a second shell member (26) connected with the first shell member (25) to enclose the cell (40); The first shell member (25) is a flat plate, and the pole assembly (30) and the explosion-proof valve (10) are arranged in the first shell member (25).

14. The battery of any one of claims 1-8, wherein, The thickness of the battery shell (20) is 0.1-0.5 mm.

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