battery

Abstract

This invention relates to the field of battery technology and proposes a battery including an explosion-proof valve and a battery housing. The explosion-proof valve is disposed on the first surface of the battery housing and includes a weak portion that protrudes towards the middle region of the first surface. The weak portion includes a first end point and a second end point. The area enclosed by the line connecting the first and second end points and the weak portion between the first and second end points is 'a'. The minimum distance between the first end point and the circumferential edge of the first surface is 'b', and the minimum distance between the second end point and the circumferential edge of the first surface is 'c'. The weak portion can be punctured to achieve a reliable explosion-proof effect, thereby improving the safety performance of the battery. At the same time, it prevents the pressure of the entire explosion-proof valve from being too concentrated, which could cause the explosion-proof valve to explode prematurely and affect the normal use of the battery.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery. Background Technology

[0002] In related technologies, explosion-proof valves are mostly plate-shaped structures. Further, explosion-proof valves can be roughly rectangular structures. During use, the explosion-proof valve can be directly fixed to the battery casing to block the explosion-proof vent. When the internal pressure of the battery casing reaches a certain level, the explosion-proof valve bursts open, thereby releasing pressure and ensuring the battery's safety performance.

[0003] However, explosion-proof valves with a plate-like structure are prone to poor explosion-proof performance, or after the explosion-proof valve bursts open, the gas or liquid discharged from inside the battery may spray onto adjacent batteries, thus causing safety problems. Summary of the Invention

[0004] This invention provides a battery to improve battery performance.

[0005] The present invention provides a battery, including an explosion-proof valve and a battery housing. The explosion-proof valve is disposed on a first surface of the battery housing. The explosion-proof valve includes a weak portion that can be broken through. The weak portion protrudes toward the middle region of the first surface. The weak portion includes a first endpoint and a second endpoint. The area enclosed by the line connecting the first endpoint and the second endpoint and the weak portion between the first endpoint and the second endpoint is a. The minimum distance between the first endpoint and the circumferential edge of the first surface is b. The minimum distance between the second endpoint and the circumferential edge of the first surface is c.

[0006] Where 0.8≤b / c≤1.2, b≤20mm, 5mm 3 ≤ab≤300mm 3 .

[0007] The battery in this embodiment of the invention includes an explosion-proof valve and a battery housing. The explosion-proof valve is disposed in the battery housing, so that when the internal pressure of the battery housing reaches a preset value, the weak part of the explosion-proof valve can be broken through to achieve the explosion-proof function. The area enclosed by the line connecting the first endpoint and the second endpoint and the weak part between the first endpoint and the second endpoint is 'a'. The minimum distance between the first endpoint and the circumferential edge of the first surface is 'b', and the minimum distance between the second endpoint and the circumferential edge of the first surface is 'c', where 0.8 ≤ b / c ≤ 1.2. This ensures that the distances between the first endpoint and the second endpoint and the circumferential edge of the first surface are basically consistent, guaranteeing that the weak part can burst open under specific pressure and avoiding excessive length difference, which would make it difficult for the explosion-proof valve to burst open. The area enclosed by the line connecting the first endpoint and the second endpoint and the weak part is relatively large, making it easier to burst open. Therefore, the distances between the first endpoint and the second endpoint and the circumferential edge of the first surface can be greater. The area enclosed by the line connecting the first and second endpoints and the weak point is relatively small, requiring a large burst pressure to achieve explosion. Therefore, the distance between the first and second endpoints and the circumferential edge of the first surface can be relatively close to facilitate rapid opening of the explosion-proof valve. This is achieved by setting b≤20mm, 5mm 3 ≤ab≤300mm 3 This design allows for controllable burst pressure of the explosion-proof valve, thereby improving battery safety. The weak point protrudes towards the center of the first surface, making it easier for the weak point to tear and burst. This facilitates timely bursting of the weak point under specific pressure, and the bursting explosion-proof valve can form a guide section, allowing gas and liquid to escape promptly while preventing spraying onto adjacent batteries. Attached Figure Description

[0008] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

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

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

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

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

[0013] Figure 5 This is a partial structural schematic diagram of a battery according to another exemplary embodiment.

[0014] The annotations in the attached figures are explained as follows:

[0015] 10. Explosion-proof valve; 11. First straight segment; 113. First end point; 12. Second straight segment; 123. Second end point; 13. Middle segment; 133. First segment; 134. Second segment; 135. Third segment; 20. Battery casing; 21. First surface; 22. Second surface; 24. Recess; 27. Flange structure; 30. Terminal assembly. Detailed Implementation

[0016] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0017] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0018] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0019] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0020] One embodiment of the present invention provides a battery, please refer to... Figures 1 to 5 The battery includes an explosion-proof valve 10 and a battery housing 20. The explosion-proof valve 10 is disposed on the first surface 21 of the battery housing 20. The explosion-proof valve 10 includes a weak portion that can be broken through. The weak portion protrudes towards the middle region of the first surface 21. The weak portion includes a first endpoint 113 and a second endpoint 123. The area enclosed by the line connecting the first endpoint 113 and the second endpoint 123 and the weak portion between the first endpoint 113 and the second endpoint 123 is denoted as 'a'. The minimum distance between the first endpoint 113 and the circumferential edge of the first surface 21 is denoted as 'b', and the minimum distance between the second endpoint 123 and the circumferential edge of the first surface 21 is denoted as 'c'. Wherein, 0.8 ≤ b / c ≤ 1.2, b ≤ 20 mm, and 5 mm 3 ≤ab≤300mm 3 .

[0021] An embodiment of the present invention provides a battery 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 weak point of the explosion-proof valve 10 can be ruptured to achieve an explosion-proof function. The area enclosed by the line connecting the first endpoint 113 and the second endpoint 123 and the weak point between the first endpoint 113 and the second endpoint 123 is denoted as 'a'. The minimum distance between the first endpoint 113 and the circumferential edge of the first surface 21 is denoted as 'b', and the minimum distance between the second endpoint 123 and the circumferential edge of the first surface 21 is denoted as 'c'. The weak point protrudes towards the middle region of the first surface 21, and 0.8 ≤ b / c ≤ 1.2, b ≤ 20 mm, 5 mm. 3 ≤ab≤300mm 3 This makes the explosion-proof valve 10 easy to tear open and burst, ensuring that the explosion-proof valve 10 does not burst prematurely. Furthermore, the bursting explosion-proof valve 10 can form a guide section, facilitating the timely release of gas and liquid while preventing spraying onto adjacent batteries, thereby improving the safe operation of the batteries.

[0022] It should be noted that the explosion-proof valve 10 includes a weak section, which can be a region with lower strength. This allows the weak section of the explosion-proof valve 10 to be breached when the internal pressure of the battery casing 20 reaches a preset value, thus achieving the explosion-proof function. The weak section can be formed by structural thinning, or it can be formed from a material with lower strength.

[0023] The weak portion protrudes towards the middle region of the first surface 21, thereby causing the opening formed by the weak portion to be positioned away from the middle region of the first surface 21. This allows the opening to face the circumferential edge of the first surface 21. This protrusion towards the middle region of the first surface 21 does not represent a structural protrusion, but rather reflects the direction of the weak portion. For example, the weak portion may consist of two intersecting straight line segments. In this case, the protrusion can be considered as the opening extending towards the intersection of the two intersecting straight line segments; that is, the protrusion can be considered as the weak portion protruding from the circumferential edge of the first surface 21 towards the middle region of the first surface 21. Alternatively, the weak portion may consist of three straight line segments forming a U-shape. In this case, the protrusion can be considered as the opening extending towards the bottom wall of the U-shape; that is, the protrusion can be considered as the weak portion protruding from the circumferential edge of the first surface 21 towards the middle region of the first surface 21. Figure 5 As shown, the first straight segment 11, the middle segment 13 and the second straight segment 12 that make up the explosion-proof valve 10 generally form a bent structure, and the explosion-proof valve 10 as a whole can be considered to protrude from the circumferential edge away from the first surface 21, that is, the opening formed by the explosion-proof valve 10 is set towards the corner area of ​​the circumferential edge.

[0024] Combination Figure 4 As shown, the area enclosed by the line connecting the first endpoint 113 and the second endpoint 123 of the weak portion and the weak portion between the first endpoint 113 and the second endpoint 123 is denoted as 'a'. The minimum distance between the first endpoint 113 and the circumferential edge of the first surface 21 is 'b', and the minimum distance between the second endpoint 123 and the circumferential edge of the first surface 21 is 'c'. 0.8 ≤ b / c ≤ 1.2, b ≤ 20 mm, 5 mm 3 The stress distribution at the explosion-proof valve 10 can be effectively controlled by ≤ab≤300mm3, thereby ensuring that the explosion-proof valve 10 can burst open when the internal pressure of the battery housing 20 reaches the preset value.

[0025] The minimum distance between the first endpoint 113 and the circumferential edge of the first surface 21 is b, and the minimum distance between the second endpoint 123 and the circumferential edge of the first surface 21 is c. 0.8≤b / c≤1.2, so that the distances between the first endpoint 113 and the second endpoint 123 and the circumferential edge of the first surface 21 are basically consistent, ensuring that the weak part can burst open under specific pressure, avoiding excessive length difference, which would make it difficult for the explosion-proof valve 10 to burst open. With b≤20mm and c≤20mm, the distance between the first endpoint 113 and the second endpoint 123 of the weak portion and the circumferential edge of the first surface 21 is relatively close. This makes the weak portion easier to tear and burst, facilitating its timely bursting under specific pressure. The weak portion protrudes towards the middle region of the first surface. After the explosion-proof valve 10 bursts, it can form a spray direction away from the middle region of the first surface 21. That is, the bursting explosion-proof valve 10 can form a guide portion, and the guide portion's outlet direction is towards the outer edge of the first surface 21. This not only facilitates the timely ejection of gas and liquid but also avoids spraying onto adjacent batteries. When batteries are assembled, the first surfaces 21 of two adjacent batteries can be positioned opposite each other.

[0026] The area enclosed by the line connecting the first endpoint 113 and the second endpoint 123 and the weak point is a, b≤20mm, 5mm. 3 ≤ab≤300mm 3 This effectively controls the magnitude of stress concentration and prevents the explosion-proof valve 10 from opening prematurely. It ensures that the explosion-proof valve 10 opens when the internal pressure of the battery casing 20 reaches the preset value, thereby releasing the internal pressure of the battery casing 20 and ensuring the safety performance of the battery.

[0027] The area enclosed by the line connecting the first endpoint 113 and the second endpoint 123, along with the weak point, is relatively large, making it easier to achieve explosive opening. Therefore, the distance between the first endpoint 113 and the second endpoint 123 and the circumferential edge of the first surface 21 can be greater. Conversely, if the area enclosed by the line connecting the first endpoint 113 and the second endpoint 123, along with the weak point, is small, a larger bursting pressure is required to achieve explosive opening. Therefore, the distance between the first endpoint 113 and the second endpoint 123 and the circumferential edge of the first surface 21 can be closer to facilitate rapid opening of the explosion-proof valve 10.

[0028] The area enclosed by the line connecting the first endpoint 113 and the second endpoint 123, and the weak point between the first endpoint 113 and the second endpoint 123, is denoted as 'a'. Figure 4As shown, the line connecting the first endpoint 113 and the second endpoint 123 is the straight line shown in the figure. The weak part between the first endpoint 113 and the second endpoint 123 can be a connecting line formed by the first straight line segment 11, the second straight line segment 12 and the middle segment 13 toward the inner wall of the line connecting the first endpoint 113 and the second endpoint 123. The area enclosed by the straight line and the connecting line is a.

[0029] In one embodiment, 0.9≤b / c≤1.1 and / or b≤15mm ensures that the explosion-proof valve 10 is symmetrically cantilevered and easily achieves stress concentration, and that the weak part can burst open under specific pressure, avoiding excessive length difference, which would make it difficult for the explosion-proof valve 10 to burst open.

[0030] In one embodiment, 20mm 3 ≤ab≤100mm 3 This effectively controls the magnitude of stress concentration and prevents the explosion-proof valve 10 from opening prematurely. It ensures that the explosion-proof valve 10 opens when the internal pressure of the battery casing 20 reaches the preset value, thereby releasing the internal pressure of the battery casing 20 and ensuring the safety performance of the battery.

[0031] In one embodiment, the ratio between the minimum distance b between the first endpoint 113 and the circumferential edge of the first surface 21 and the minimum distance c between the second endpoint 123 and the circumferential edge of the first surface 21 can be 0.8, 0.85, 0.9, 0.95, 0.98, 1, 1.05, 1.1, 1.15, or 1.2, etc.

[0032] In one embodiment, the product of the area 'a' enclosed by the line connecting the first endpoint 113 and the second endpoint 123 and the weak portion between the first endpoint 113 and the second endpoint 123, and the minimum distance 'b' between the first endpoint 113 and the circumferential edge of the first surface 21 can be 5 mm. 3 8mm 3 10mm 3 15mm 3 18mm 3 20mm 3 22mm 3 25mm 3 30mm 3 40mm 3 45mm 3 50mm 3 60mm 3 70mm 3 80mm 3 90mm 3 100mm 3 125mm 3 130mm3 140mm 3 150mm 3 160mm 3 170mm 3 180mm 3 190mm 3 195mm 3 200mm 3 205mm 3 210mm 3 220mm 3 250mm 3 260mm 3 270mm 3 280mm 3 290mm 3 395mm 3 Or 300mm 3 etc.

[0033] In one embodiment, the weak point includes a first straight segment 11, a second straight segment 12, and a middle segment 13. The two ends of the middle segment 13 are respectively connected to the first straight segment 11 and the second straight segment 12. The end of the first straight segment 11 furthest from the middle segment 13 is the first endpoint 113, and the end of the second straight segment 12 furthest from the middle segment 13 is the second endpoint 123. By setting the explosion-proof valve 10 to consist of the first straight segment 11, the second straight segment 12, and the middle segment 13, with the two ends of the middle segment 13 respectively connected to the first straight segment 11 and the second straight segment 12, it can be ensured that at least one of the first straight segment 11, the second straight segment 12, and the middle segment 13 can be ruptured when the internal pressure of the battery casing 20 reaches a preset value, thereby achieving a reliable explosion-proof effect, improving the safety performance of the battery, and preventing the pressure of the entire explosion-proof valve 10 from being too concentrated, causing the explosion-proof valve 10 to explode prematurely and affecting the normal use of the battery.

[0034] In one embodiment, the length of the first straight segment 11 and the length of the second straight segment 12 are basically the same, so that the middle segment 13 in the middle and the first straight segment 11 and the second straight segment 12 between the two ends form a symmetrical structure, and the stress on the middle segment 13 is uniform, which makes it easy for the middle segment 13 to burst open under specific pressure.

[0035] In one embodiment, the length of the first straight segment 11 and the length of the second straight segment 12 are controlled between 1mm and 45mm. This not only ensures that stress concentration can be easily achieved within the first straight segment 11 and the second straight segment 12, but also ensures that the first straight segment 11 and the second straight segment 12 can burst open under a preset pressure.

[0036] In one embodiment, the first straight segment 11 and the second straight segment 12 may have an included angle, which can achieve stress concentration while avoiding excessive and uncontrollable stress. This ensures that when the internal pressure of the battery casing 20 reaches a preset value, the explosion-proof valve 10 will burst open, thereby releasing the internal pressure of the battery casing 20 and ensuring the safety performance of the battery.

[0037] In one embodiment, the included angle between the first straight line segment 11 and the second straight line segment 12 can be controlled between 46° and 134°.

[0038] In one embodiment, the intermediate section 13 includes a curved section, which reduces stress concentration and ensures that the burst pressure of the explosion-proof valve 10 is controllable, preventing accidental bursting. The curved section can be an arc segment or a non-arc segment.

[0039] In one embodiment, the first straight segment 11 is connected to the curved segment, and / or the second straight segment 12 is connected to the curved segment, thereby avoiding stress concentration at the connection point between the first straight segment 11 and the middle segment 13, and stress concentration at the connection point between the second straight segment 12 and the middle segment 13, thereby effectively controlling the burst pressure of the explosion-proof valve 10 and improving the safety performance of the battery.

[0040] In one embodiment, such as Figure 4 As shown, the middle section 13 is an arc segment, which can not only avoid stress concentration at the connection point between the first straight section 11 and the middle section 13, but also avoid stress concentration at the connection point between the second straight section 12 and the middle section 13, and can achieve uniform stress distribution, thereby making the explosion-proof valve 10's opening pressure controllable.

[0041] In one embodiment, the widths of the first straight segment 11, the second straight segment 12, and the middle segment 13 can be substantially the same, and the widths of the first straight segment 11, the second straight segment 12, and the middle segment 13 can be controlled between 0.1mm and 1mm.

[0042] In one embodiment, such as Figure 2 and Figure 3 As shown, the battery housing 20 includes two opposing first surfaces 21 and four second surfaces 22 arranged around the first surfaces 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 disposed on the first surface 21, so that the first surface 21 can provide a reliable support surface for the explosion-proof valve 10 and facilitate the installation of the explosion-proof valve 10, thereby improving the safety protection performance of the explosion-proof valve 10.

[0043] It should be noted that the battery casing 20 can be a square casing. The two opposing first surfaces 21 are the large surfaces of the battery casing 20, while the four second surfaces 22 are the small surfaces of the battery casing 20. The four second surfaces 22 include two pairs of small surfaces, namely a first pair of small surfaces extending along the length direction of the battery casing 20 and a second pair of small surfaces extending along the width direction of the battery casing 20. 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 surfaces.

[0044] In one embodiment, the explosion-proof valve 10 is disposed in the corner area of ​​the first surface 21. This not only allows for a reasonable arrangement of the placement of the explosion-proof valve 10, but also prevents the gas or liquid inside the battery casing 20 from being sprayed toward adjacent batteries after the explosion-proof valve 10 explodes, thereby avoiding impact on adjacent batteries.

[0045] At least a portion of the intermediate section 13 protrudes toward the middle region of the first surface 21, that is, at least a portion of the intermediate section 13 is disposed away from the circumferential edge of the first surface 21, thereby controlling the distance between the intermediate section 13 and the arc transition section, thereby controlling the bursting pressure of the explosion-proof valve 10.

[0046] In one embodiment, the minimum vertical distance between the explosion-proof valve 10 and its adjacent second surface 22 is less than 10 mm, thereby allowing the explosion-proof valve 10 to be as close as possible to the edge of the battery housing 20, thus minimizing the risk of gas and liquid inside the battery housing 20 being ejected toward adjacent batteries after the explosion-proof valve 10 explodes, thereby improving the safety performance of the battery.

[0047] The corner regions of the first surface 21 can be understood as the regions located at both ends of the diagonal of the first surface 21. The first surface 21 can be roughly rectangular, in which case the first surface 21 can have four corner regions.

[0048] The minimum vertical distance between the explosion-proof valve 10 and its adjacent second surface 22 is less than 10mm. That is, the minimum distance between the side of the explosion-proof valve 10 closest to the second surface 22 and the second surface 22 needs to be less than 10mm. This allows the explosion-proof valve 10 to be as close as possible to the outer circumferential edge of the battery housing 20, i.e., the explosion-proof valve 10 can be as close as possible to the second surface 22. This allows for a reasonable arrangement of the explosion-proof valve 10's position and reduces the probability that gas and liquid inside the battery housing 20 will be ejected toward adjacent batteries after the explosion-proof valve 10 explodes.

[0049] In one embodiment, there is an arc transition section between two adjacent second surfaces 22. The minimum vertical distance between the first straight segment 11 and one of the second surfaces 22 is less than 10 mm, that is, the minimum vertical distance between the first endpoint 113 and one of the second surfaces 22 is less than 10 mm. The minimum vertical distance between the second straight segment 12 and another second surface 22 is less than 10 mm, that is, the minimum vertical distance between the second endpoint 123 and another second surface 22 is less than 10 mm. The minimum vertical distance between the middle segment 13 and the arc transition section is less than 20 mm. This allows the explosion-proof valve 10 to be as close as possible to the circumferential outer edge of the battery housing 20. This not only improves the space utilization of the battery housing 20, but also reduces the probability that gas and liquid inside the battery housing 20 will be sprayed toward adjacent batteries after the explosion-proof valve 10 is opened.

[0050] It should be noted that, in combination Figure 3 As shown, the battery housing 20 may have a flange structure 27, which surrounds the circumferential outer surface of the battery housing 20. The flange structure 27 can be formed by connecting two separate housing parts, thereby improving the connection stability of the two housing parts. The battery housing 20 includes two opposing first surfaces 21 and four second surfaces 22 surrounding the first surfaces 21. Here, the first surfaces 21 and second surfaces 22 may not include the surface formed by the flange structure 27, thereby ensuring that the gas inside the battery housing 20 is in contact with the explosion-proof valve 10, thus ensuring that the explosion-proof valve 10 can be ruptured when the internal pressure of the battery housing 20 reaches a preset value.

[0051] For the minimum vertical distance between the first endpoint 113 and a second surface 22 being less than 10 mm, the minimum vertical distance between the second endpoint 123 and another second surface 22 being less than 10 mm, and the minimum vertical distance between the middle section 13 and the arc transition section being less than 20 mm, it can be considered that after the flange structure 27 of the battery casing 20 is completely removed, the minimum distance between the first endpoint 113 and the circumferential edge of the first surface 21 is less than 10 mm, the minimum distance between the second endpoint 123 and the circumferential edge of the first surface 21 is less than 10 mm, and the minimum distance between the middle section 13 and the circumferential edge of the first surface 21 is less than 20 mm.

[0052] It should be noted that when the battery casing 20 has a flange structure 27, the minimum distance between the first endpoint 113 and the circumferential edge of the first surface 21 is greater than the minimum vertical distance between the first endpoint 113 and a second surface 22, and the minimum distance between the second endpoint 123 and the circumferential edge of the first surface 21 is greater than the minimum vertical distance between the second endpoint 123 and another second surface 22.

[0053] In one embodiment, such as Figure 4 and Figure 5As shown, at least a portion of the intermediate section 13 protrudes away from the adjacent arc transition section, that is, at least a portion of the intermediate section 13 is disposed away from the circumferential edge of the first surface 21, thereby controlling the distance between the intermediate section 13 and the arc transition section, thereby controlling the burst pressure of the explosion-proof valve 10.

[0054] It should be noted that at least a portion of the intermediate segment 13 protrudes towards a certain position, or at least a portion of the intermediate segment 13 protrudes away from a certain position, primarily to illustrate the trend of the intermediate segment 13. For example, taking the configuration where at least a portion of the intermediate segment 13 protrudes towards the middle region of the first surface 21 as an example, combined with... Figure 4 and Figure 5 As shown, the first straight segment 11, the middle segment 13 and the second straight segment 12 that make up the explosion-proof valve 10 generally form a bent structure, and the explosion-proof valve 10 as a whole can be considered to protrude from the circumferential edge away from the first surface 21, that is, the opening formed by the explosion-proof valve 10 is set towards the corner area of ​​the circumferential edge.

[0055] In one embodiment, the battery casing 20 includes two opposing first surfaces 21 and four second surfaces 22 surrounding the first surfaces 21; wherein, the explosion-proof valve 10 is disposed in the corner area of ​​the first surface 21, and the first straight segment 11 and the second straight segment 12 are respectively perpendicular to the two adjacent second surfaces 22. Further, the first straight segment 11 is substantially perpendicular to the second surface 22 adjacent to it, and the second straight segment 12 is substantially perpendicular to the second surface 22 adjacent to it, so that the distance between the end of the first straight segment 11 and one second surface 22 is relatively close, and the distance between the end of the second straight segment 12 and the other second surface 22 is relatively close, which makes it easier for the explosion-proof valve 10 to burst open, thereby improving the safety performance of the battery.

[0056] It should be noted that the results shown in the embodiments are obtained after taking into account processing errors, installation errors, etc. For example, the first straight line segment 11 is generally perpendicular to the second surface 22 adjacent to it, and the second straight line segment 12 is generally perpendicular to the second surface 22 adjacent to it. When processing errors, installation errors, etc. are ignored, it can be assumed that the first straight line segment 11 is perpendicular to the second surface 22 adjacent to it, and the second straight line segment 12 is perpendicular to the second surface 22 adjacent to it.

[0057] In some embodiments, it is not excluded that the first straight line segment 11 and its adjacent second surface 22 have a certain angle, for example, the angle between the first straight line segment 11 and its adjacent second surface 22 is in the range of 60° to 90°. The second straight line segment 12 and its adjacent second surface 22 have a certain angle, for example, the angle between the second straight line segment 12 and its adjacent second surface 22 is in the range of 60° to 90°.

[0058] In one embodiment, the explosion-proof valve 10 and the battery housing 20 can be separately configured, that is, the battery housing 20 can be provided with an explosion-proof hole, and the explosion-proof valve 10 is connected to the battery housing 20 to block the explosion-proof hole. In this case, the explosion-proof valve 10 can include a first straight segment 11, a second straight segment 12, and an intermediate segment 13, so that the first straight segment 11, the second straight segment 12, and the intermediate segment 13 can serve as weak points of the explosion-proof valve 10, so that when the internal pressure of the battery housing 20 reaches a preset value, the weak points burst open, thereby achieving pressure relief.

[0059] In one embodiment, at least a portion of the explosion-proof valve 10 and the battery housing 20 are integrally molded, which not only simplifies the structure but also reduces manufacturing steps, thereby improving the molding efficiency of the explosion-proof valve 10.

[0060] The explosion-proof valve 10 and at least a portion of the battery housing 20 are integrally formed. For example, a portion of the battery housing 20 can be thinned to form the explosion-proof valve 10. Alternatively, the battery housing 20 can be partially thinned during the molding process to serve as the explosion-proof valve 10, thereby achieving the pressure relief function. This process is relatively simple and can improve the molding efficiency of the explosion-proof valve 10.

[0061] It should be noted that the explosion-proof valve 10 may include a weak part, which may be composed of a first straight section 11, a second straight section 12 and an intermediate section 13. This allows the explosion-proof valve 10 to burst open primarily through the first straight section 11, the second straight section 12 and the intermediate section 13, thereby meeting the explosion-proof requirements and achieving the pressure relief effect.

[0062] In one embodiment, the explosion-proof valve 10 is provided with grooves to form a weak part. The grooves may include a first groove, a second groove, and a third groove, so that the explosion-proof valve 10 forms a first straight segment 11, a second straight segment 12, and an intermediate segment 13. That is, by providing the first groove, the second groove, and the third groove on the explosion-proof valve 10, the explosion-proof valve 10 is thinned to form a weak part, thereby meeting the explosion-proof requirements and achieving the pressure relief effect.

[0063] The explosion-proof valve 10 and the battery housing 20 can be separate components, that is, the first groove, the second groove and the third groove are formed on the explosion-proof valve 10, and the weak part of the explosion-proof valve 10 can be composed of the first straight segment 11, the second straight segment 12 and the middle segment 13.

[0064] At least a portion of the explosion-proof valve 10 and the battery housing 20 can be integrally formed, meaning that the first, second, and third notches are formed on the battery housing 20. By providing the first, second, and third notches on the battery housing 20, the battery housing 20 is thinned, creating a weak point to meet the explosion-proof requirements and achieve a pressure relief effect. The weak point of the explosion-proof valve 10 can be composed of a first straight segment 11, a second straight segment 12, and an intermediate segment 13.

[0065] In one embodiment, such as Figure 5 As shown, the intermediate section 13 includes a first section 133, a second section 134, and a third section 135. The two ends of the third section 135 are connected to the first section 133 and the second section 134, respectively. The first section 133 and the second section 134 are connected to the first straight section 11 and the second straight section 12, respectively. The first section 133 and the second section 134 are both arc sections, while the third section 135 is a straight section. This ensures that the first straight section 11 and the third section 135 are connected by an arc section, and the second straight section 12 and the third section 135 are connected by an arc section. This avoids excessive stress concentration and ensures that the explosion-proof valve 10 can be opened while the opening pressure of the explosion-proof valve 10 is controllable.

[0066] In one embodiment, such as Figure 1 and Figure 2 As shown, there are at least two explosion-proof valves 10, and the at least two explosion-proof valves 10 are located on the same side of the battery housing 20. Furthermore, the at least two explosion-proof valves 10 are located on the same surface of the battery housing 20, which can improve the explosion-proof performance of the explosion-proof valves 10 and avoid battery safety problems caused by one explosion-proof valve 10 failing to open. Setting at least two explosion-proof valves 10 on the same side of the battery housing 20 can also facilitate the control of the direction of gas and liquid ejection inside the battery housing 20 after the explosion-proof valve 10 opens, thereby improving the safety performance of the battery.

[0067] In one embodiment, at least two explosion-proof valves 10 are centrally symmetrical about the intersection of the first and second diagonal directions of the battery housing 20, so that the direction of the battery can be adjusted according to the series or parallel connection requirements between the batteries during the battery assembly process, and the adjustment of the battery direction does not affect the fact that the explosion-proof valves 10 of each battery can be basically located in the same direction.

[0068] It should be noted that the two explosion-proof valves 10 are symmetrical about the intersection of the first and second diagonal directions of the battery housing 20. That is, after rotating one explosion-proof valve 10 180 degrees around the intersection of the first and second diagonal directions, the two explosion-proof valves 10 coincide.

[0069] In one embodiment, the battery may further include terminal assembly 30 and battery cell, the battery cell may include two tabs, the two tabs may be connected to two terminal assemblies 30 respectively.

[0070] In one embodiment, the terminal assembly 30 is disposed on the battery housing 20, and the battery housing 20 has a recess 24. The terminal assembly 30 is located in the recess 24, thereby avoiding the terminal assembly 30 from occupying the battery pack stacking space, thereby improving the energy density of the battery pack.

[0071] In one embodiment, such as Figure 2 and Figure 3 As shown, a recess 24 is provided on the battery housing 20. The terminal assembly 30 and the recess 24 are located on opposite surfaces of the battery housing 20. The recess 24 is used to accommodate the terminal assembly of another battery. Thus, when the batteries are assembled, the terminal assembly of another battery can be accommodated in the recess 24, thereby avoiding the terminal assembly from occupying the space between the two batteries, reducing the distance between two adjacent batteries, and thus improving the energy density of the battery pack.

[0072] In one embodiment, such as Figure 2 and Figure 3 As shown, there can be two pole post assemblies 30 and two recesses 24. The two pole post assemblies 30 can be disposed on one first surface 21, and the two recesses 24 can be disposed on another first surface 21.

[0073] In one embodiment, the length of the battery is L, 400mm≤L≤2500mm, the width of the battery is K, the height of the battery is H, 2K≤L≤50K, and / or, 0.5H≤K≤20H.

[0074] Furthermore, 50mm≤K≤200mm, 10mm≤H≤100mm.

[0075] Preferably, 4K≤L≤25K, and / or 2H≤K≤10H.

[0076] In the above embodiments, the battery has a large length-to-width ratio while ensuring sufficient energy density, and further, a large width-to-height ratio.

[0077] In one embodiment, the length of the battery is L and the width of the battery is K, where 4K≤L≤7K. That is, the ratio of the battery length to the width in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack.

[0078] 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.

[0079] Optionally, the battery length can be 500mm-1500mm, the battery width can be 80mm-150mm, and the battery height can be 15mm-25mm.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] Specifically, the battery cell is a laminated battery cell, which has a first electrode layered on top of each other, a second electrode layer with the opposite electrical charge to the first electrode layer, and a separator layer disposed between the first electrode layer and the second electrode layer, so that multiple pairs of first electrode layers and second electrode layers are stacked to form a laminated battery cell.

[0084] 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.

[0085] One embodiment of the present invention also provides a battery pack comprising the aforementioned battery.

[0086] According to one embodiment of the present invention, the battery pack includes an explosion-proof valve 10 and a battery housing 20. The explosion-proof valve 10 is disposed in the battery housing 20, so that when the internal pressure of the battery housing 20 reaches a preset value, the weak part of the explosion-proof valve 10 can be ruptured to achieve an explosion-proof function. By making the weak part protrude towards the middle region of the first surface 21, the distance between the first endpoint 113 and the second endpoint 123 of the weak part and the circumferential edge of the first surface 21, as well as the area enclosed by the line connecting the first endpoint 113 and the second endpoint 123 and the weak part, can be controlled to ensure that the weak part can be ruptured when the internal pressure of the battery housing 20 reaches the preset value, thereby achieving a reliable explosion-proof function and improving the safety performance of the battery pack.

[0087] In one embodiment, the battery pack is a battery module or a battery pack.

[0088] The battery module includes multiple batteries, and may also include end plates and side plates for fixing the multiple batteries.

[0089] 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.

[0090] 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.

[0091] 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 in that, The device includes an explosion-proof valve (10) and a battery housing (20). The explosion-proof valve (10) is disposed on the first surface (21) of the battery housing (20). The explosion-proof valve (10) includes a weak portion that can be broken through. The weak portion protrudes toward the middle area of ​​the first surface (21). The weak portion includes a first endpoint (113) and a second endpoint (123). The area enclosed by the line connecting the first endpoint (113) and the second endpoint (123) and the weak portion between the first endpoint (113) and the second endpoint (123) is a. The minimum distance between the first endpoint (113) and the circumferential edge of the first surface (21) is b. The minimum distance between the second endpoint (123) and the circumferential edge of the first surface (21) is c. The battery casing (20) includes two opposing first surfaces (21) and four second surfaces (22) surrounding the first surfaces (21). There is an arc transition section between two adjacent second surfaces (22). The vertical distance between the first endpoint (113) and one of the second surfaces (22) is less than 10 mm. The vertical distance between the second endpoint (123) and another second surface (22) is less than 10 mm. The weak part includes a middle section (13). The vertical distance between the middle section (13) and the arc transition section is less than 20 mm. At least a portion of the middle section (13) protrudes away from the arc transition section adjacent to it. Where 0.8≤b / c≤1.2, b≤20mm, 5mm 3 ≤ab≤300mm 3 The width of the battery is K, where 50mm ≤ K ≤ 200mm.

2. The battery according to claim 1, characterized in that, 0.9≤b / c≤1.1, and / or b≤15mm.

3. The battery according to claim 1, characterized in that, 20mm 3 ≤ab≤100mm 3 。 4. The battery according to claim 1, characterized in that, The weak part also includes a first straight segment (11) and a second straight segment (12). The two ends of the middle segment (13) are respectively connected to the first straight segment (11) and the second straight segment (12). The end of the first straight segment (11) away from the middle segment (13) is the first endpoint (113), and the end of the second straight segment (12) away from the middle segment (13) is the second endpoint (123).

5. The battery according to claim 4, characterized in that, The intermediate segment (13) includes a curved segment.

6. The battery according to claim 5, characterized in that, The first straight line segment (11) is connected to the curved segment, and / or the second straight line segment (12) is connected to the curved segment.

7. The battery according to claim 4, characterized in that... The area of ​​the first surface (21) is larger than the area of ​​the second surface (22); The explosion-proof valve (10) is located in the corner area of ​​the first surface (21); At least a portion of the intermediate segment (13) protrudes toward the middle region of the first surface (21).

8. The battery according to claim 7, characterized in that, The first straight line segment (11) is generally perpendicular to the second surface (22) adjacent to it, and the second straight line segment (12) is generally perpendicular to the second surface (22) adjacent to it.

9. The battery according to any one of claims 1 to 8, characterized in that, The explosion-proof valve (10) and at least part of the battery housing (20) are integrally formed.

10. The battery according to any one of claims 1 to 8, characterized in that, There are at least two explosion-proof valves (10), and at least two explosion-proof valves (10) are located on the same surface of the battery housing (20); Among them, at least two of the explosion-proof valves (10) are symmetrical about the intersection of the first and second diagonal directions of the battery housing (20).

11. The battery according to any one of claims 1 to 8, characterized in that, The battery also includes a terminal assembly (30), which is disposed in the battery housing (20); The battery housing (20) has a recess (24) and the terminal assembly (30) is located in the recess (24). Alternatively, the terminal assembly (30) and the recess (24) are located on opposite surfaces of the battery housing (20). The recess (24) is used to accommodate the terminal assembly of another battery.

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