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 a circular arc section, the two ends of the circular arc 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 arc length of the circular arc section is c, the curvature radius of the circular arc section is r, 0.8<=a / b<=1.2, 0.5<=c / r<=2.7, and at least one of the first straight section, the second straight section and the circular arc section can be broken, so that reliable explosion-proof effect is achieved, and the safety performance of the battery is improved.

Description

Technical Field

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

[0002] After prolonged use, a large amount of heat may accumulate inside the battery, which can cause excessive internal pressure. If this pressure is not released in time, it may lead to battery safety issues.

[0003] In related technologies, explosion-proof valves are often used to depressurize batteries. However, due to the limitations of the structure of explosion-proof valves, it is difficult to control the timing of their opening. Summary of the Invention

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

[0005] This invention provides a battery, including an explosion-proof valve and a battery housing. The explosion-proof valve is disposed in the battery housing and includes a first straight segment, a second straight segment, and an arc segment. The two ends of the arc segment are respectively connected to the first straight segment and the second straight segment. At least one of the first straight segment, the second straight segment, and the arc segment can be broken through. The lengths of the first straight segment and the second straight segment are a and b, respectively. The arc length of the arc segment is c, and the radius of curvature of the arc segment is r, where 0.9≤a / b≤1.9 and 0.5≤c / r≤2.7.

[0006] The battery of this invention includes an explosion-proof valve and a battery casing. The explosion-proof valve is disposed in the battery casing so that when the internal pressure of the battery casing reaches a preset value, the explosion-proof valve can be ruptured to achieve an explosion-proof function. The explosion-proof valve is configured as a first straight segment, a second straight segment, and an arc segment. The two ends of the arc segment are connected to the first and second straight segments, respectively. The lengths of the first and second straight segments are a and b, respectively. The arc length of the arc segment is c, and the radius of curvature of the arc segment is r. If the ratio of the arc length to the radius of curvature of the arc segment is too large, the corresponding angle of the arc segment will be too large, leading to a problem of stress concentration, thus making it difficult for the explosion-proof valve to burst open, potentially causing safety issues. Conversely, if the ratio of the arc length to the radius of curvature of the arc segment is too small, the corresponding angle of the arc segment will be too small, leading to a problem of stress concentration, making it difficult to control the stress of the explosion-proof valve, thus making the explosion-proof valve prone to bursting open, potentially affecting the normal use of the battery. By ensuring that 0.9≤a / b≤1.1 and 0.5≤c / r≤2.7, the stress distribution at the explosion-proof valve can be effectively controlled. This ensures that the explosion-proof valve can burst open when the internal pressure of the battery casing reaches the preset value, thus achieving a reliable explosion-proof effect and improving the safety performance of the battery. Furthermore, it ensures that the explosion-proof valve will not burst accidentally when the internal pressure of the battery does not exceed the preset value. Attached Figure Description

[0007] 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:

[0008] Figure 1 This is a partial structural schematic diagram of a battery according to an exemplary embodiment;

[0009] Figure 2 This is a schematic diagram of the structure of a battery according to an exemplary embodiment;

[0010] Figure 3 This is a schematic diagram of a partial structure of a battery according to an exemplary embodiment;

[0011] Figure 4 This is a schematic diagram of another partial structure of a battery according to an exemplary embodiment.

[0012] The annotations in the attached figures are explained as follows:

[0013] 10. Explosion-proof valve; 11. First straight segment; 111. First sidewall; 112. Second sidewall; 12. Second straight segment; 121. Third sidewall; 122. Fourth sidewall; 13. Arc segment; 131. Fifth sidewall; 132. Sixth sidewall; 20. Battery casing; 21. First surface; 22. Second surface; 27. Flange structure; 30. Terminal assembly. Detailed Implementation

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] One embodiment of the present invention provides a battery, please refer to... Figures 1 to 4 The battery includes an explosion-proof valve 10 and a battery housing 20. The explosion-proof valve 10 is disposed in the battery housing 20. The explosion-proof valve 10 includes a first straight segment 11, a second straight segment 12, and an arc segment 13. The two ends of the arc segment 13 are respectively connected to the first straight segment 11 and the second straight segment 12. The lengths of the first straight segment 11 and the second straight segment 12 are a and b, respectively. The arc length of the arc segment 13 is c, and the radius of curvature of the arc segment 13 is r, 0.9≤a / b≤1.1, 0.5≤c / r≤2.7. When the internal pressure of the battery housing 20 reaches a preset value, at least one of the first straight segment 11, the second straight segment 12, and the arc segment 13 can be broken.

[0019] 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 explosion-proof valve 10 can be ruptured to achieve an explosion-proof function. By configuring the explosion-proof valve 10 as a first straight segment 11, a second straight segment 12, and an arc segment 13, with the two ends of the arc segment 13 connected to the first straight segment 11 and the second straight segment 12 respectively, the lengths of the first straight segment 11 and the second straight segment 12 being a and b respectively, the arc length of the arc segment 13 being c, and the radius of curvature of the arc segment 13 being r, where 0.9 ≤ a / b ≤ 1.1 and 0.5 ≤ c / r ≤ 2.7, the stress distribution at the explosion-proof valve 10 can be effectively controlled. This ensures that the explosion-proof valve 10 can burst open when the internal pressure of the battery housing 20 reaches the preset value, achieving a reliable explosion-proof function, thereby improving the safety performance of the battery. Furthermore, it ensures that the explosion-proof valve 10 will not accidentally burst open when the internal pressure of the battery does not exceed the preset value.

[0020] It should be noted that the explosion-proof valve 10 includes a first straight segment 11, a second straight segment 12, and an arc segment 13. The first straight segment 11 may extend along a first straight direction, the second straight segment 12 may extend along a second straight direction, and the arc segment 13 may extend along an arc direction.

[0021] When the internal pressure of the battery casing 20 reaches a preset value, at least one of the first straight segment 11, the second straight segment 12, and the arc segment 13 can be broken through. The first straight segment 11, the second straight segment 12, and the arc segment 13 can burst open the weak area of ​​the explosion-proof valve 10, thereby achieving the explosion-proof effect and timely venting the gas inside the battery casing 20 to avoid safety problems.

[0022] Combination Figure 4 As shown, the length of the first straight segment 11 is a, the length of the second straight segment 12 is b, the arc length of the arc segment 13 is c, and the radius of curvature of the arc segment 13 is r. By setting 0.9≤a / b≤1.1 and 0.5≤c / r≤2.7, the stress distribution at the explosion-proof valve 10 can be effectively controlled, thereby ensuring that the explosion-proof valve 10 can burst open when the internal pressure of the battery casing 20 reaches the preset value.

[0023] The length of the first straight segment 11 is 'a', and the length of the second straight segment 12 is 'b', with 0.9 ≤ a / b ≤ 1.1. This ensures that the lengths of the first straight segment 11 and the second straight segment 12 are essentially the same, creating a symmetrical structure between the arc segment 13 in the middle and the first and second straight segments 11 and 12 at both ends. The arc segment 13 experiences uniform stress, facilitating its bursting under specific pressure. Stress concentration is easily achieved within the first and second straight segments 11 and 12, thus facilitating the bursting of the explosion-proof valve 10 and effectively improving battery safety performance.

[0024] The arc length of the arc segment 13 is c, and the radius of curvature of the arc segment 13 is r, 0.5≤c / r≤2.7, which can effectively control the magnitude of stress concentration. This ensures that when the internal pressure of the battery casing 20 reaches the 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.

[0025] If the ratio of the arc length to the radius of curvature of arc segment 13 is too large, the corresponding angle of arc segment 13 will be too large, leading to stress concentration problems. This could cause the explosion-proof valve 10 to fail to open, posing a safety hazard. Conversely, if the ratio is too small, the corresponding angle of arc segment 13 will be too small, leading to stress concentration problems. This could make stress control of the explosion-proof valve 10 difficult, causing it to easily open and potentially affecting the normal use of the battery.

[0026] 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 0.9, 0.95, 0.97, 1, 1.05, 1.08, or 1.1, etc.

[0027] In one embodiment, 1≤c / r≤2.1, thereby effectively controlling the magnitude of stress concentration and ensuring that when the internal pressure of the battery casing 20 reaches a preset value, the explosion-proof valve 10 bursts open, thereby releasing the internal pressure of the battery casing 20 and ensuring the safety performance of the battery.

[0028] In one embodiment, the ratio of the arc length c of the arc segment 13 to the radius of curvature r of the arc segment 13 can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.5, 1.57, 1.8, 2, 2.1, 2.3, 2.5, 2.6 or 2.7, etc.

[0029] In one embodiment, the angle corresponding to the arc segment 13 can be 60°-120°, and the angle corresponding to the arc segment 13 can be 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105° or 120°, etc.

[0030] In one embodiment, 1mm≤a≤40mm, 1mm≤b≤40mm, by controlling the length of the first straight segment 11 and the length of the second straight segment 12 between 1mm and 40mm, it is possible not only to ensure that stress concentration can be easily achieved in the first straight segment 11 and the second straight segment 12, but also to ensure that the first straight segment 11 and the second straight segment 12 can burst open under a preset pressure.

[0031] The shorter lengths of the first straight segment 11 and the second straight segment 12 result in a larger proportion of the arc segment 13 in the entire explosion-proof valve 10, making it difficult for the first straight segment 11 and the second straight segment 12 to effectively concentrate stress. Conversely, the longer lengths of the first straight segment 11 and the second straight segment 12 lead to excessive stress concentration in the entire explosion-proof valve 10, preventing it from opening under the preset pressure and affecting the normal use of the battery.

[0032] In one embodiment, the length of the first straight segment 11 can be 1mm, 1.5mm, 2mm, 3mm, 5mm, 10mm, 15mm, 20mm, 25mm, 28mm, 30mm, 35mm, 37mm, 38mm, 39mm, or 40mm, etc.

[0033] In one embodiment, the widths of the first straight segment 11, the second straight segment 12, and the arc segment 13 are all the same, which facilitates the processing and forming of the structure, thereby improving the forming efficiency of the explosion-proof valve 10 and thus improving the forming efficiency of the battery.

[0034] In one embodiment, the explosion-proof valve 10 is located in the corner area of ​​the battery housing 20. This not only allows for a reasonable arrangement of the explosion-proof valve 10's location, but also prevents gas or liquid inside the battery housing 20 from being sprayed toward adjacent batteries after the explosion-proof valve 10 explodes, thereby avoiding impact on adjacent batteries.

[0035] The battery housing 20 can be a square housing, which may have four corner areas. In this case, the explosion-proof valve 10 can be disposed in a corner area of ​​one surface, or in the intersection area of ​​two adjacent surfaces. For example, the battery housing 20 includes two opposing first surfaces 21 and four second surfaces 22 surrounding the first surfaces 21. The explosion-proof valve 10 can be disposed at any one of the four corner areas of the first surface 21, or at the intersection area of ​​two adjacent second surfaces 22, or at the intersection area of ​​the first surface 21 and the second surface 22, or at any one of the four corner areas of the second surface 22.

[0036] In one embodiment, such as Figure 2 As shown, the battery housing 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, so that the explosion-proof valve 10 is as close as possible to the edge of the battery housing 20, thereby minimizing the risk of gas and liquid inside the battery housing 20 being sprayed toward adjacent batteries after the explosion-proof valve 10 explodes, thereby improving the safety performance of the battery.

[0037] 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.

[0038] 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 second surface 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, and the minimum vertical distance between the arc 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, which 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.

[0039] It should be noted that, in combination Figure 2 As shown, the battery housing 20 may have a flange structure 27, which is disposed around the circumferential outer surface of the battery housing 20.

[0040] The battery housing 20 includes two opposing first surfaces 21 and four second surfaces 22 arranged around the first surfaces 21. The first surfaces 21 and the 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, so that the explosion-proof valve 10 can be broken when the internal pressure of the battery housing 20 reaches a preset value.

[0041] For the minimum vertical distance between the first straight segment 11 and a second surface 22 being less than 10mm, the minimum vertical distance between the second straight segment 12 and another second surface 22 being less than 10mm, and the minimum vertical distance between the arc segment 13 and the arc transition segment being less than 20mm, it can be considered that after the flange structure 27 of the battery casing 20 is completely removed, the minimum distance between the first straight segment 11 and the circumferential edge of the first surface 21 is less than 10mm, the minimum distance between the second straight segment 12 and the circumferential edge of the first surface 21 is less than 10mm, and the minimum distance between the arc segment 13 and the circumferential edge of the first surface 21 is less than 20mm.

[0042] In one embodiment, such as Figure 3 and Figure 4 As shown, at least a portion of the arc segment 13 protrudes toward the adjacent arc transition segment, that is, at least a portion of the arc segment 13 is located close to the circumferential edge of the first surface 21, thereby making the distance between the arc segment 13 and the corner area of ​​the circumferential edge of the first surface 21 relatively small.

[0043] In one embodiment, at least a portion of the arc segment 13 protrudes away from its adjacent arc transition segment, that is, at least a portion of the arc segment 13 is disposed away from the circumferential edge of the first surface 21, thereby controlling the distance between the arc segment 13 and the arc transition segment, thereby controlling the burst pressure of the explosion-proof valve 10.

[0044] In one embodiment, the battery casing 20 includes two opposing first surfaces 21 and four second surfaces 22 surrounding the first surfaces 21. An explosion-proof valve 10 is disposed at a corner region of the first surface 21. A first straight segment 11 and a second straight segment 12 are parallel to two adjacent second surfaces 22, respectively. Furthermore, the first straight segment 11 is substantially parallel to its adjacent second surface 22, and the second straight segment 12 is substantially parallel to its adjacent second surface 22. This ensures that the distance between the first straight segment 11 and one second surface 22 is consistent, and the distance between the second straight segment 12 and another second surface 22 is consistent. This allows stress to be easily concentrated, making the explosion-proof valve 10 easier to open, thereby improving the battery's safety performance.

[0045] The length of the first straight segment 11 is a, and the length of the second straight segment 12 is b, 0.9≤a / b≤1.1. The first straight segment 11 and the second straight segment 12 are parallel to two adjacent second surfaces 22, so that the first straight segment 11 and the second straight segment 12 can basically form a cantilever symmetrical structure. This makes it easy to achieve stress concentration and avoids the problem that the explosion-proof valve 10 is difficult to open due to the large difference in length between the first straight segment 11 and the second straight segment 12.

[0046] In one embodiment, such as Figure 3 and Figure 4 As shown, at least a portion of the arc segment 13 protrudes toward the circumferential edge of the first surface 21, that is, at least a portion of the arc segment 13 is located close to the circumferential edge of the first surface 21, thereby making the distance between the arc segment 13 and the corner area of ​​the circumferential edge of the first surface 21 relatively small.

[0047] In one embodiment, at least a portion of the arc segment 13 protrudes toward the middle region of the first surface 21, that is, at least a portion of the arc segment 13 is disposed away from the circumferential edge of the first surface 21, thereby controlling the distance between the arc segment 13 and the arc transition segment, thereby controlling the burst pressure of the explosion-proof valve 10.

[0048] It should be noted that at least a portion of the arc segment 13 protrudes towards a certain position, or at least a portion of the arc segment 13 protrudes away from a certain position, emphasizing the trend of the arc segment 13. For example, taking the configuration where at least a portion of the arc segment 13 protrudes towards the circumferential edge of the first surface 21 as an example, combined with... Figure 4As shown, the first straight segment 11, the arc segment 13, and the second straight segment 12 constituting the explosion-proof valve 10 generally form a bent structure. The explosion-proof valve 10 as a whole can be considered to protrude towards the circumferential edge of the first surface 21, that is, the opening formed by the explosion-proof valve 10 is located away from the corner area of ​​the circumferential edge. Taking the arc segment 13 as an example where at least a portion protrudes towards the middle area of ​​the first surface 21, the first straight segment 11, the arc segment 13, and the second straight segment 12 constituting the explosion-proof valve 10 generally form a bent structure. The explosion-proof valve 10 as a whole can be considered to protrude away from the circumferential edge of the first surface 21, that is, the opening formed by the explosion-proof valve 10 is located towards the corner area of ​​the circumferential edge.

[0049] 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 parallel to the second surface 22 adjacent to it, and the second straight line segment 12 is generally parallel to the second surface 22 adjacent to it. When processing errors, installation errors, etc. are ignored, it can be considered that the first straight line segment 11 is parallel to the second surface 22 adjacent to it, and the second straight line segment 12 is parallel to the second surface 22 adjacent to it.

[0050] In one embodiment, 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 surfaces 21 is larger than the area of ​​the second surfaces 22, and the explosion-proof valve 10 is disposed on the first surfaces 21, so that the first surfaces 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.

[0051] It should be noted that the two opposing first surfaces 21 are the large surfaces of the battery housing 20, while the four second surfaces 22 are the small surfaces of the battery housing 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 housing 20 and a second pair of small surfaces extending along the width direction of the battery housing 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.

[0052] 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 arc segment 13, so that the first straight segment 11, the second straight segment 12, and the arc segment 13 can serve as weak areas of the explosion-proof valve 10, so that when the internal pressure of the battery housing 20 reaches a preset value, the weak areas burst open, thereby achieving pressure relief.

[0053] 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.

[0054] 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.

[0055] It should be noted that the explosion-proof valve 10 may include a weak part, which may be composed of a first straight segment 11, a second straight segment 12 and an arc segment 13. This allows the explosion-proof valve 10 to burst open primarily through the first straight segment 11, the second straight segment 12 and the arc segment 13, thereby meeting the explosion-proof requirements and achieving the pressure relief effect.

[0056] In one embodiment, the battery casing 20 is provided with a first groove, a second groove, and a third groove to form a first straight segment 11, a second straight segment 12, and an arc segment 13 on the battery casing 20, respectively. That is, by providing the first groove, the second groove, and the third groove on the battery casing 20, the battery casing 20 is thinned, creating a weak point to meet the explosion-proof requirements and achieve a pressure relief effect. The widths of the first groove, the second groove, and the third groove can be equal to the widths of the first straight segment 11, the second straight segment 12, and the arc segment 13, respectively.

[0057] It should be noted that the first straight segment 11 can extend along the first straight line direction, the second straight segment 12 can extend along the second straight line direction, and the arc segment 13 can extend along the arc direction. Correspondingly, the first scribe line can extend along the first straight line direction, the second scribe line can extend along the second straight line direction, and the third scribe line can extend along the arc direction. Thus, after forming the first scribe line, the second scribe line, and the third scribe line, the first straight segment 11, the second straight segment 12, and the arc segment 13 can be formed on the battery casing 20, and the first straight segment 11, the second straight segment 12, and the arc segment 13 serve as the weak points of the explosion-proof valve 10.

[0058] In one embodiment, the width of the first notch is 0.1mm-1mm, the width of the second notch is 0.1mm-1mm, and the width of the third notch is 0.1mm-1mm. This allows the width of the first straight segment 11 to be 0.1mm-1mm, the width of the second straight segment 12 to be 0.1mm-1mm, and the width of the arc segment 13 to be 0.1mm-1mm. That is, at least one of the first straight segment 11, the second straight segment 12, and the arc segment 13 can be broken through under a preset pressure, and the structural strength is relatively high. This avoids the problem of the explosion-proof valve 10 accidentally opening when the internal pressure of the battery is not higher than the preset value.

[0059] In one embodiment, the width of the first notch can be 0.1mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.48mm, 0.5mm, 0.52mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1mm, etc.

[0060] The width of the second notch can be 0.1mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.48mm, 0.5mm, 0.52mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1mm, etc.

[0061] The width of the third notch can be 0.1mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.48mm, 0.5mm, 0.52mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1mm, etc.

[0062] In one embodiment, the thickness of the battery casing 20 is d, and the depth of the first, second, and third notches is e, 0.04mm≤de≤1mm. That is, the thickness range of the first straight segment 11, the second straight segment 12, and the arc segment 13 is 0.04mm-1mm. This not only ensures that the explosion-proof valve 10 has a certain strength, but also allows the explosion-proof valve to burst open under a preset pressure, thereby achieving safe protection for the battery.

[0063] In one embodiment, the thickness of the first straight segment 11, the second straight segment 12, and the arc segment 13 can be 0.04mm, 0.05mm, 0.1mm, 0.2mm, 0.25mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.65mm, 0.7mm, 0.8mm, 0.9mm, or 1mm, etc.

[0064] In one embodiment, the first groove is a gradually expanding structure, with the width of the first groove gradually increasing from the bottom to the top. The second groove is also a gradually expanding structure, with the width of the second groove gradually increasing from the bottom to the top. The width of the third groove gradually increases from the bottom to the top. This not only allows at least one of the first straight segment 11, the second straight segment 12, and the arc segment 13 to be broken when the internal pressure of the battery casing 20 reaches a preset value, but also facilitates the rapid discharge of gas and liquid from the battery casing 20.

[0065] The longitudinal cross-sections of the first, second, and third notches can be approximately trapezoidal, or the bottom walls of the first, second, and third notches can be approximately curved.

[0066] In one embodiment, the first notch can be an equidistant structure, that is, the width of the first notch is consistent from the bottom to the top of the first notch; the second notch can be an equidistant structure, that is, the width of the second notch is consistent from the bottom to the top of the second notch; and the third notch can be an equidistant structure, that is, the width of the third notch is consistent from the bottom to the top of the third notch.

[0067] The longitudinal cross-sections of the first, second, and third notches can be approximately rectangular, or the bottom walls of the first, second, and third notches can be approximately curved.

[0068] In one embodiment, such as Figure 3As shown, the first notch includes opposing first sidewalls 111 and 112, the second notch includes opposing third sidewalls 121 and 122, and the third notch includes opposing fifth sidewalls 131 and 132. The first sidewall 111, second sidewall 112, third sidewall 121, and fourth sidewall 122 are all planar surfaces, while the fifth sidewall 131 and sixth sidewall 132 are both arc surfaces. The two ends of the fifth sidewall 131 are respectively connected to the first... One side wall 111 and the third side wall 121, the two ends of the sixth side wall 132 are connected to the second side wall 112 and the fourth side wall 122 respectively. The lengths of the first side wall 111 and the third side wall 121 are a and b respectively. The arc length of the fifth side wall 131 is c and the radius of curvature of the fifth side wall 131 is r. And / or the lengths of the second side wall 112 and the fourth side wall 122 are a and b respectively. The arc length of the sixth side wall 132 is c and the radius of curvature of the sixth side wall 132 is r.

[0069] The battery casing 20 is provided with a first groove, a second groove and a third groove, so as to form a first straight line segment 11, a second straight line segment 12 and an arc segment 13 on the battery casing 20 respectively. Therefore, the shape of the first groove, the second groove and the third groove directly determines the shape of the first straight line segment 11, the second straight line segment 12 and the arc segment 13.

[0070] The lengths of the first straight line segment 11 and the second straight line segment 12 can be equal to the lengths of the first sidewall 111 and the third sidewall 121, respectively. The arc length of the circular arc segment 13 can be equal to the arc length of the fifth sidewall 131, and the radius of curvature of the circular arc segment 13 can be equal to the radius of curvature of the fifth sidewall 131. Alternatively, the lengths of the first straight line segment 11 and the second straight line segment 12 can be equal to the lengths of the second sidewall 112 and the fourth sidewall 122, respectively. The arc length of the circular arc segment 13 can be equal to the arc length of the sixth sidewall 132, and the radius of curvature of the circular arc segment 13 can be equal to the radius of curvature of the sixth sidewall 132. Alternatively, the length of the first straight segment 11 can be equal to the length of the center line between the first sidewall 111 and the second sidewall 112, the length of the second straight segment 12 can be equal to the length of the center line between the third sidewall 121 and the fourth sidewall 122, the arc length of the arc segment 13 can be equal to the arc length of the center line between the fifth sidewall 131 and the sixth sidewall 132, and the radius of curvature of the arc segment 13 can be the radius of curvature of the center line between the fifth sidewall 131 and the sixth sidewall 132.

[0071] In one embodiment, such as Figure 1 and Figure 2As 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.

[0072] 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.

[0073] 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.

[0074] In one embodiment, such as Figure 1 and Figure 2 As shown, the battery also includes a terminal assembly 30 and a battery cell. The battery cell is disposed inside the battery housing 20, and the terminal assembly 30 is disposed in the battery housing 20 and connected to the battery cell. The terminal assembly 30 and the explosion-proof valve 10 are spaced apart and are arranged along the width direction of the battery housing 20. This not only facilitates the subsequent connection of the terminal assembly 30 to the busbar, but also makes full use of the space in the battery housing 20, thereby ensuring that the battery cell and other structures can be reasonably arranged inside the battery housing 20, thus improving the space utilization rate of the battery housing 20.

[0075] The terminal assembly 30 and the explosion-proof valve 10 can be located at the end of the battery housing 20, and the explosion-proof valve 10 is located at the corner of the battery housing 20. For example, the terminal assembly 30 and the explosion-proof valve 10 can be disposed on the first surface 21. Considering that the first surface 21 is the large surface of the battery housing 20, it can provide sufficient support to the terminal assembly 30 to ensure the stability of the terminal assembly 30.

[0076] In some embodiments, there are two terminal post assemblies 30, and the battery cell may have two tabs. The two terminal post assemblies 30 and the two tabs can be electrically connected. In one embodiment, the thickness of the battery casing 20 is 0.1mm-0.5mm, thereby reducing the weight of the battery casing 20 and thus increasing the energy density of the battery.

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

[0078] 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.

[0079] Furthermore, 50mm≤K≤200mm, 10mm≤H≤100mm.

[0080] Preferably, 4K≤L≤25K, and / or 2H≤K≤10H.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Optionally, the battery length can be 500mm-1500mm, the battery width can be 80mm-150mm, and the battery height can be 15mm-25mm.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] An embodiment of the present invention also provides a battery pack comprising the aforementioned battery.

[0091] 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 explosion-proof valve 10 can be ruptured to achieve an explosion-proof function. By configuring the explosion-proof valve 10 as a first straight segment 11, a second straight segment 12, and an arc segment 13, with the two ends of the arc 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 arc segment 13 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.

[0092] In one embodiment, the battery pack is a battery module or a battery pack.

[0093] The battery module includes multiple batteries, and may also include end plates and side plates for fixing the multiple batteries.

[0094] 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.

[0095] 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.

[0096] 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 in the battery housing (20). The explosion-proof valve (10) includes a first straight segment (11), a second straight segment (12), and an arc segment (13). The two ends of the arc segment (13) are respectively connected to the first straight segment (11) and the second straight segment (12). At least one of the first straight segment (11), the second straight segment (12), and the arc segment (13) can be broken through. The lengths of the first straight segment (11) and the second straight segment (12) are a and b, respectively. The arc length of the arc segment (13) is c. The radius of curvature is r, 0.9≤a / b≤1.1, 0.5≤c / r≤2.7, the battery casing (20) includes two opposing first surfaces (21) and four second surfaces (22) arranged around the first surface (21), the explosion-proof valve (10) is arranged in the corner area of ​​the first surface (21), the minimum vertical distance between the first straight segment (11) and the first second surface (22) is less than 10mm, the minimum vertical distance between the second straight segment (12) and the second second surface (22) is less than 10mm, and the first second surface (22) and the second second surface (22) are arranged adjacent to each other; The battery also includes a terminal assembly (30), which is disposed on the battery housing (20). The terminal assembly (30) is spaced apart from the explosion-proof valve (10). The terminal assembly (30) and the explosion-proof valve (10) are disposed along the width direction of the battery housing (20) and are located on the same first surface (21). The width of the battery is K, 50mm≤K≤200mm, and the length of the battery is L, 2K≤L≤50K. The explosion-proof valve (10) is located in the corner area of ​​the battery housing (20).

2. The battery according to claim 1, characterized in that, 1mm≤a≤40mm.

3. The battery according to claim 1, characterized in that, The widths of the first straight line segment (11), the second straight line segment (12), and the arc segment (13) are all the same.

4. The battery according to claim 1, characterized in that, There is an arc transition section between two adjacent second surfaces (22), and the minimum vertical distance between the arc section (13) and the arc transition section is less than 20 mm.

5. The battery according to claim 4, characterized in that, At least a portion of the arc segment (13) protrudes toward the adjacent arc transition segment, or at least a portion of the arc segment (13) protrudes away from the adjacent arc transition segment.

6. The battery according to claim 1, characterized in that, The first straight line segment (11) is generally parallel to the second surface (22) adjacent to it, and the second straight line segment (12) is generally parallel to the second surface (22) adjacent to it.

7. The battery according to claim 6, characterized in that, At least a portion of the arc segment (13) is provided to protrude toward the circumferential edge of the first surface (21).

8. The battery according to claim 1, characterized in that, The area of ​​the first surface (21) is greater than the area of ​​the second surface (22).

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 claim 9, characterized in that, The battery casing (20) is provided with a first groove, a second groove and a third groove to form the first straight line segment (11), the second straight line segment (12) and the arc segment (13) on the battery casing (20) respectively.

11. The battery according to claim 10, characterized in that, The first groove includes a first sidewall (111) and a second sidewall (112) opposite each other, the second groove includes a third sidewall (121) and a fourth sidewall (122) opposite each other, the third groove includes a fifth sidewall (131) and a sixth sidewall (132) opposite each other, the first sidewall (111), the second sidewall (112), the third sidewall (121) and the fourth sidewall (122) are all planar, and the fifth sidewall (131) and the sixth sidewall (132) are both arc surfaces; Wherein, the two ends of the fifth sidewall (131) are connected to the first sidewall (111) and the third sidewall (121) respectively, and the two ends of the sixth sidewall (132) are connected to the second sidewall (112) and the fourth sidewall (122) respectively. The lengths of the first sidewall (111) and the third sidewall (121) are a and b respectively, the arc length of the fifth sidewall (131) is c, and the radius of curvature of the fifth sidewall (131) is r, and / or the lengths of the second sidewall (112) and the fourth sidewall (122) are a and b respectively, the arc length of the sixth sidewall (132) is c, and the radius of curvature of the sixth sidewall (132) is r.

12. The battery according to any one of claims 1 to 8, characterized in that, The explosion-proof valve (10) is at least two; 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).

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