A single cell and a battery pack

Abstract

The embodiment of the utility model provides a kind of single battery and battery pack, it is related to battery technical field, to improve the technical problem that battery is out of control when in prior art due to battery shell internal gas cannot be discharged in time, gas is prone to accumulation in shell interior, to cause security risk.It includes shell and cover plate set on shell, cover plate is equipped with explosion-proof valve mounting hole, the explosion-proof valve mounting hole is provided with explosion-proof valve, and the cover plate is provided with the notch part around the explosion-proof valve mounting hole.The single battery and battery pack provided by the utility model can release the pressure in the containing cavity in time, and avoid the security risk caused by the accumulation of gas in the containing cavity.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a single battery cell and a battery pack. Background Technology

[0002] To ensure the safety of the battery system and reduce the risk of battery explosion, an explosion-proof valve is usually installed on the top cover of the battery to release pressure in time when thermal runaway occurs inside a single cell.

[0003] When existing batteries experience thermal runaway, due to the increasing energy density of the battery cells, conventional explosion-proof valves can open in time. However, the gas inside the battery casing cannot be released in time, which can cause the gas to accumulate inside the casing, leading to a battery cell explosion and posing a safety hazard. Utility Model Content

[0004] The purpose of this utility model is to provide a single battery and a battery pack to improve the technical problem in the prior art where, when a battery experiences thermal runaway, the gas inside the battery casing cannot be discharged in time, which easily leads to the accumulation of gas inside the casing and thus causes safety hazards.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a single-cell battery, comprising: case; A cover plate is provided on the housing and together with the housing, forms a cavity for accommodating the battery cell; an explosion-proof valve mounting hole is provided on the cover plate, an explosion-proof valve is provided in the explosion-proof valve mounting hole, and a groove is provided on the cover plate around the explosion-proof valve mounting hole; The pressure inside the containment cavity reaches the critical burst value. Under certain conditions, the explosion-proof valve and / or at least part of the grooved portion rupture to release the pressure inside the receiving cavity.

[0006] In an optional embodiment, the pressure within the containment cavity reaches a critical burst value. Under these conditions, the explosion-proof valve ruptures; The pressure inside the containment cavity is greater than the critical burst value. Under certain conditions, at least a portion of the notched portion breaks.

[0007] In an optional embodiment, the scoring portion includes a plurality of first scorings and a second scoring surrounding the plurality of first scorings; One end of each of the first markings is connected to the second marking, and the other end is connected to or spaced apart from the explosion-proof valve mounting hole.

[0008] In an optional embodiment, a primary fracture zone is defined between the second notch and the explosion-proof valve mounting hole; the primary fracture zone is separated by a plurality of first notches and defines a plurality of secondary fracture zones; The pressure inside the containment cavity reaches the first burst value. Under these conditions, at least a portion of the secondary fracture region fractures through the first notch; When the pressure inside the cavity reaches the second burst value P2, the primary fracture zone fractures through the second notch. Where P0 < P1 < P2.

[0009] In an optional embodiment, the notched portion further includes a third notch; The two ends of the third notch are respectively connected to the adjacent first notch, and the secondary fracture region is divided into multiple tertiary fracture regions; Under the condition that the pressure inside the containment cavity reaches the third burst value P3, at least a portion of the third-level fracture region fractures through the third notch; Where P0 < P3 ≤ P1 < P2.

[0010] In an optional embodiment, the residual thickness of the first groove is T1, the residual thickness of the second groove is T2, and the residual thickness of the third groove is T3. Where T3≤T1<T2.

[0011] In an optional embodiment, the third notch is formed on both sides of the explosion-proof valve mounting hole along its length.

[0012] In an optional embodiment, the second notch is arranged in a racetrack shape.

[0013] In an optional implementation, the third notch is arranged in an arc or semi-circular shape.

[0014] Secondly, this utility model provides a battery pack, including any one of the single-cell batteries described in the foregoing embodiments.

[0015] The beneficial effects of the single battery and battery pack provided in this embodiment of the utility model include: This utility model provides a single battery cell and a battery pack including the single battery cell. The single battery cell includes a housing and a cover plate disposed on the housing. The cover plate has an explosion-proof valve mounting hole, and an explosion-proof valve is disposed in the explosion-proof valve mounting hole. In the event of thermal runaway of the battery, the explosion-proof valve or the scored part can open in time to release the internal pressure of the cell. At the same time, in order to fully release the internal pressure of the cell, a scored part is also provided around the explosion-proof valve mounting hole. The rupture of the scored part can accelerate the release of internal pressure of the cell, thereby avoiding the safety hazards caused by the accumulation of gas inside the cell. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a single battery cell provided in Embodiment 1 from a first-view perspective; Figure 2 A schematic diagram of the structure of a single battery cell provided in Example 1 from a second perspective; Figure 3 This is a schematic diagram of the residual thickness of the groove in a single cell provided in Example 1; Figure 4 This is a schematic diagram of the structure of a single battery cell provided in Example 2 from a second perspective; Figure 5 This is a schematic diagram of the structure of a single battery cell provided in Example 3 from a second perspective; Figure 6 This is a schematic diagram of the residual thickness of the groove in a single cell provided in Example 3; Figure 7 for Figure 6 A magnified view of a portion of the central P section; Figure 8 This is a schematic diagram of the structure of a single cell provided in Example 4 from a second perspective.

[0018] Icon: 100 - Shell; 200 - Cover plate; 210 - Explosion-proof valve mounting hole; 211 - Explosion-proof valve; 300 - Score; 310 - First score; 320 - Second score; 330 - Third score; A1 - Primary rupture zone; A2 - Secondary rupture zone; A3 - Tertiary rupture zone. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] In the embodiments of this utility model, the battery pack refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. In the embodiments of this utility model, the individual battery cell may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited in this respect.

[0026] The single-cell battery and battery pack containing the single-cell battery provided by this utility model are used to provide the required electrical energy to various electrical devices. The electrical devices mentioned in this utility model can be mobile phones, portable devices, laptops, electric toys, and power tools, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of this utility model do not impose special limitations on the above-mentioned electrical devices.

[0027] The single battery provided by this utility model includes a housing 100 and a cover plate 200 covering the housing 100. The housing 100 and the cover plate 200 together form a receiving cavity for accommodating the battery cell. An explosion-proof valve mounting hole 210 is provided on the cover plate 200, and an explosion-proof valve 211 is provided in the explosion-proof valve mounting hole 210. A grooved portion 300 is provided on the cover plate 200 around the explosion-proof valve mounting hole 210.

[0028] When a battery malfunctions, a large amount of gas may be generated inside the containment cavity, causing the pressure inside the cavity to rise continuously. To prevent excessive pressure inside the cavity, when the pressure reaches a preset value, the gas inside the cavity can be released through the aforementioned explosion-proof valve 211 or the notched portion 300, thereby preventing the gas from continuously accumulating inside the cavity and causing safety hazards; that is, when the pressure inside the cavity reaches the critical explosion value. Under certain conditions, the explosion-proof valve 211 or at least part of the notched portion 300 ruptures to release the pressure inside the containment cavity.

[0029] In the single battery provided by this utility model, the explosion-proof valve 211 or the serrated part 300 can work independently to release the pressure inside the containment cavity. When the cell experiences thermal runaway, its temperature rises rapidly, and a violent reaction in a short time generates a large amount of gas and heat, which leads to an increase in the pressure inside the containment cavity. At this time, the explosion-proof valve 211 or the serrated part 300, which is opened by breaking alone, cannot discharge the gas accumulated in the containment cavity in time.

[0030] Therefore, in this utility model, the explosion-proof valve 211 and the serrated part 300 can be configured such that when the pressure inside the containment cavity reaches a certain preset pressure value, the gas inside the containment cavity is first released through the explosion-proof valve 211. As the pressure inside the containment cavity continues to increase, the explosion-proof valve 211, which opens by breaking alone, is unable to discharge the gas inside the containment cavity in time. In order to avoid the accumulation of gas inside the battery cell, the serrated part 300 can break at this time to increase the discharge path of the gas inside the containment cavity and improve the discharge efficiency of the gas inside the containment cavity, so as to avoid the accumulation of gas inside the battery cell.

[0031] It should be noted that, in the above situation, the order in which the explosion-proof valve 211 and the scoring part 300 break is not limited. For example, when the pressure in the containment cavity reaches a certain preset pressure value, the gas in the containment cavity is first released through the scoring part 300. As the pressure in the containment cavity continues to increase, the scoring part 300, which breaks open alone, is unable to discharge the gas in the containment cavity in time. In order to avoid the accumulation of gas inside the battery cell, the explosion-proof valve 211 can break at this time to increase the discharge path of the gas in the containment cavity and improve the discharge efficiency of the gas in the containment cavity, so as to avoid the accumulation of gas inside the battery cell.

[0032] The single cell and battery pack including the single cell provided by this utility model control the internal pressure of the containment cavity by setting an explosion-proof valve 211 and a scoring part 300. When the cell experiences thermal runaway, as the internal pressure of the containment cavity continues to increase, the explosion-proof valve 211 and the scoring part 300 can rupture and open simultaneously to allow the gas and heat inside the cell to be discharged in time, reducing the risk of the cell exploding due to untimely venting.

[0033] The following describes in detail the overall structure, working principle, and technical effects of the single-cell battery and battery pack provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0034] Example 1: Please see Figure 1 This embodiment provides a single battery cell, including a housing 100 and a cover plate 200 covering the housing 100. The housing 100 and the cover plate 200 together form a receiving cavity for accommodating the battery cell. The cover plate 200 has an explosion-proof valve mounting hole 210, an explosion-proof valve 211 is disposed in the explosion-proof valve mounting hole 210, and a scoring portion 300 is disposed around the explosion-proof valve mounting hole 210. The explosion-proof valve 211 and the scoring portion 300 are used to release the gas accumulated in the receiving cavity when a fault occurs inside the battery and the pressure in the receiving cavity exceeds a critical value, thereby releasing the pressure in the receiving cavity.

[0035] Furthermore, when a malfunction occurs inside the battery, a large amount of gas may be generated within the containment cavity, causing the pressure inside the cavity to rise continuously. As the pressure inside the containment cavity continues to rise, it will eventually reach a critical burst value. Under certain conditions, the explosion-proof valve 211 ruptures to release the pressure within the containment cavity; that is, the burst value of the explosion-proof valve 211 is configured to be similar to the critical burst value. Equal; when the pressure inside the containment cavity continues to rise, causing the pressure inside the containment cavity to exceed the above-mentioned critical burst value. Under certain conditions, at least a portion of the notched portion 300 fractures to further release the pressure within the receiving cavity.

[0036] Please see Figure 2 In this embodiment, the etched portion 300 includes a plurality of first etched marks 310 arranged radially around the explosion-proof valve mounting hole 210, and a second etched mark 320 arranged around the plurality of first etched marks 310.

[0037] Specifically, one end of the first notch 310 is connected to the second notch 320, and the other end is a blind end, which is spaced apart from the explosion-proof valve mounting hole 210.

[0038] In this embodiment, the second notch 320 is racetrack shaped and surrounds the outside of the explosion-proof valve mounting hole 210; the second notch 320 and the explosion-proof valve mounting hole 210 define a primary fracture region A1, which is separated by the multiple first notches 310 and defines multiple secondary fracture regions A2.

[0039] Understandably, the primary rupture zone A1 is a rupture zone composed of multiple secondary rupture zones A2. Compared with the explosion-proof valve 211 and the secondary rupture zone A2, the primary rupture zone A1 has a larger rupture area, and thus has better pressure release efficiency.

[0040] In this embodiment, the pressure inside the accommodating cavity reaches the first burst value. Under these conditions, at least a portion of the secondary fracture region A2 fractures via the first notch 310; When the pressure inside the cavity reaches the second burst value P2, the primary fracture region A1 fractures through the second notch 320; wherein, P0 < P1 < P2.

[0041] In other words, as the pressure inside the containment cavity increases, it reaches the critical burst value. Under these conditions, explosion-proof valve 211 ruptures; when the pressure inside the containment cavity continues to rise and exceeds... achieve At that time, at least part of the secondary fracture zone A2 fractured through the first notch 310; when the pressure inside the cavity continued to rise and exceeded When P2 is reached, the primary fracture region A1 fractures through the second notch 320; at this time, the fracture region defined by the notch 300 is completely fractured, thereby fully releasing the pressure in the cavity.

[0042] Please see Figure 3 In order to enable the first notch 310 and the second notch 320 to break successively as the internal pressure of the cavity increases, in this embodiment, the residual thickness of the first notch 310 is T1, the residual thickness of the second notch 320 is T2, and T1 < T2.

[0043] It should be noted that in this embodiment, the residual thickness refers to the remaining thickness of the engraving on the cover plate 200, specifically the thickness of the remaining cover plate 200 material that has not been etched away in the engraving area after the engraving process.

[0044] It is understandable that, since the residual thickness T1 of the first notch 310 is less than the residual thickness T2 of the second notch 320, the first notch 310 will rupture before the second notch 320 under pressure. This allows the secondary rupture region A2 and the primary rupture region A1 to rupture sequentially. Consequently, under the internal pressure of the containment cavity, the explosion-proof valve 211, the secondary rupture region A2, and the primary rupture region A1 can rupture in a gradient to release pressure and prevent gas from accumulating in the containment cavity. At the same time, when the cell experiences thermal runaway, opening the valve in the area specified in the cell design can reduce the thermal propagation of the PACK-side cell caused by instability in the valve-opening area.

[0045] The single battery provided in this embodiment has a scribing portion 300 around the explosion-proof valve mounting hole 210. When the explosion-proof valve 211 has difficulty in timely venting the gas inside the battery casing 100, the scribing portion 300 can be broken, thereby expanding the venting area and improving the venting efficiency, thus preventing the gas from accumulating inside the casing 100. At the same time, the scribing portion 300 includes a first scribing portion 310 and a second scribing portion 320, as well as a primary rupture area A1 defined by the second scribing portion 320 on the cover plate 200 and multiple secondary rupture areas A2 separated by the first scribing portion 310. As the pressure inside the cavity continues to rise, the explosion-proof valve 211, the secondary rupture area A2, and the primary rupture area A1 can be broken sequentially according to the design path, thereby reducing the heat spread of the PACK end cell caused by the instability of the valve opening area.

[0046] Example 2: Please see Figure 4 This embodiment provides a single battery cell, which is generally similar to the first embodiment in terms of overall structure, working principle and technical effects. The difference is that in this embodiment, the end of the first notch 310 away from the second notch 320 is connected to the explosion-proof valve mounting hole 210.

[0047] In this embodiment, one end of the plurality of first notches 310 is connected to the second notch 320, and the other end is connected to the explosion-proof valve mounting hole 210.

[0048] Compared to Embodiment 1, the single battery provided in this embodiment connects the two ends of the first notch 310 to the second notch 320 and the explosion-proof valve mounting hole 210, respectively, so that multiple secondary rupture zones A2 can open more evenly in all directions, thereby improving the pressure release efficiency of the notch portion 300 to the cavity.

[0049] Example 3: Please see Figure 5 This embodiment provides a single battery cell, which is generally similar to the first embodiment in terms of overall structure, working principle and technical effects. The difference is that in this embodiment, the notched portion 300 also includes a plurality of third notches 330.

[0050] Specifically, the scoring section 300 includes a plurality of first scorings 310 arranged radially around the explosion-proof valve mounting hole 210, a second scoring 320 arranged around the plurality of first scorings 310, and a third scoring 330 connected to the plurality of first scorings 310; wherein, one end of the first scoring 310 is connected to the second scoring 320, and the other end is a blind end, which is spaced apart from the explosion-proof valve mounting hole 210.

[0051] Furthermore, the third notch 330 is formed on both sides of the explosion-proof valve mounting hole 210 along the length direction and connects to the adjacent first notch 310; the shape of the third notch 330 is arc-shaped or semi-circular, and the number of third notches 330 can be 2, 4, 6, etc.

[0052] For example, the third notch 330 is arc-shaped and there are two of them.

[0053] In this embodiment, the third notch 330 can divide the secondary fracture region A2 into multiple tertiary fracture regions A3, thereby further controlling the fracture region of the secondary fracture region A2.

[0054] Specifically, under the condition that the pressure inside the cavity reaches the third burst value P3, at least part of the third-level fracture region A3 fractures through the third notch 330; where P0 < P3 < P1 < P2.

[0055] In practical work, as the pressure inside the containment cavity increases, it reaches the critical burst value. Under these conditions, explosion-proof valve 211 ruptures; when the pressure inside the containment cavity continues to rise and exceeds... achieve At that time, at least part of the third-degree fracture zone A3 fractured through the third notch 330; when the pressure inside the cavity continued to rise and exceeded achieve At that time, at least part of the secondary fracture zone A2 fractured through the first notch 310; when the pressure inside the cavity continued to rise and exceeded When P2 is reached, the primary fracture region A1 fractures through the second notch 320; at this time, the fracture region defined by the notch 300 is completely fractured, thereby fully releasing the pressure in the cavity.

[0056] Please see Figure 6 and Figure 7 In order to enable the third notch 330, the first notch 310 and the second notch 320 to break successively as the internal pressure of the cavity increases, in this embodiment, the residual thickness of the third notch 330 is T3; wherein, T3 < T1 < T2.

[0057] It is understandable that, since the remaining thickness T3 of the third notch 330 is less than the remaining thickness of the first notch 310 and the second notch 320, the third notch 330 will rupture before the first notch 310 and the second notch 320 under pressure. This allows the tertiary rupture region A3, the secondary rupture region A2, and the primary rupture region A1 to rupture sequentially. Consequently, under the internal pressure of the containment cavity, the explosion-proof valve 211, the tertiary rupture region A3, the secondary rupture region A2, and the primary rupture region A1 can rupture in a gradient to release pressure and prevent gas from accumulating in the containment cavity.

[0058] In some embodiments, the residual thickness of the third notch 330 can be configured to be equal to the residual thickness of the first notch 310, which is T1. Correspondingly, the explosive value of the tertiary fracture region A3 is equal to the explosive value of the secondary fracture region A2, i.e., T3≤T1<T2, P0<P3≤P1<P2.

[0059] In practical work, when the pressure inside the cavity continues to rise and exceeds... achieve At that time, at least part of the tertiary fracture zone A3 fractures through the third notch 330 or all of the tertiary fracture zones A3 fracture together with the secondary fracture zone A2, so as to release the pressure in the containment cavity in a timely manner.

[0060] Example 4: Please see Figure 8 This embodiment provides a single battery cell, which is generally similar to Embodiment 3 in terms of overall structure, working principle and technical effects. The difference is that in this embodiment, the end of the first notch 310 away from the second notch 320 is connected to the explosion-proof valve mounting hole 210.

[0061] In this embodiment, one end of the plurality of first notches 310 is connected to the second notch 320, and the other end is connected to the explosion-proof valve mounting hole 210.

[0062] Compared to Embodiment 3, the single battery provided in this embodiment connects the two ends of the first notch 310 to the second notch 320 and the explosion-proof valve mounting hole 210 respectively, thereby enabling multiple tertiary rupture zones A3 to open more evenly in all directions, thereby improving the pressure release efficiency of the notch portion 300 on the cavity.

[0063] The single-cell battery and battery pack including the single-cell battery provided by this utility model control the internal pressure of the containment cavity by setting an explosion-proof valve 211 and a notch 300. When the cell experiences thermal runaway, as the internal pressure of the containment cavity continues to increase, the explosion-proof valve 211 and the notch 300 can rupture and open simultaneously to allow the gas and heat inside the cell to be discharged in time, reducing the risk of explosion caused by untimely venting. In addition, by setting a third notch 330, a first notch 310 and a second notch 320, the tertiary rupture region A3, the secondary rupture region A2 and the primary rupture region A1 can rupture along a specified path to avoid problems such as unstable rupture or uneven valve opening.

[0064] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A single-cell battery, characterized in that, include: Casing (100); A cover plate (200) is provided on the housing (100) and together with the housing (100) forms a receiving cavity for accommodating the battery cell; an explosion-proof valve mounting hole (210) is provided on the cover plate (200), an explosion-proof valve (211) is provided in the explosion-proof valve mounting hole (210), and a grooved portion (300) is provided on the cover plate (200) around the explosion-proof valve mounting hole (210); The pressure inside the containment cavity reaches the critical burst value. Under certain conditions, the explosion-proof valve (211) and / or at least part of the notched portion (300) rupture to release the pressure inside the receiving cavity.

2. The single-cell battery according to claim 1, characterized in that, The pressure inside the containment cavity reaches the critical burst value. Under these conditions, the explosion-proof valve (211) ruptures; The pressure inside the containment cavity is greater than the critical burst value. Under certain conditions, at least part of the notched portion (300) breaks.

3. The single-cell battery according to claim 1, characterized in that, The scoring portion (300) includes a plurality of first scorings (310) and a second scoring (320) disposed around the plurality of first scorings (310); One end of each of the first grooves (310) is connected to the second groove (320), and the other end is connected to or spaced apart from the explosion-proof valve mounting hole (210).

4. The single-cell battery according to claim 3, characterized in that, The second notch (320) defines a primary fracture zone (A1) between itself and the explosion-proof valve mounting hole (210); the primary fracture zone (A1) is separated by a plurality of first notches (310) and defines a plurality of secondary fracture zones (A2). The pressure inside the containment cavity reaches the first burst value. Under the conditions described above, at least a portion of the secondary fracture region (A2) fractures through the first notch (310); When the pressure inside the cavity reaches the second burst value P2, the primary fracture zone (A1) fractures through the second notch (320); Where P0 < P1 < P2.

5. The single-cell battery according to claim 4, characterized in that, The notched portion (300) also includes a third notch (330); The two ends of the third notch (330) are respectively connected to the adjacent first notch (310), and the secondary fracture region (A2) is divided into multiple tertiary fracture regions (A3). Under the condition that the pressure inside the cavity reaches the third burst value P3, at least a portion of the third-level fracture region (A3) fractures through the third notch (330); Where P0 < P3 ≤ P1 < P2.

6. The single-cell battery according to claim 5, characterized in that, The remaining thickness of the first notch (310) is T1, the remaining thickness of the second notch (320) is T2, and the remaining thickness of the third notch (330) is T3; Where T3≤T1<T2.

7. The single-cell battery according to claim 5, characterized in that, The third notch (330) is formed on both sides of the explosion-proof valve mounting hole (210) along the length direction.

8. The single-cell battery according to claim 3, characterized in that, The second notch (320) is set in a racetrack shape.

9. The single-cell battery according to claim 5, characterized in that, The third notch (330) is set in an arc or semi-circle shape.

10. A battery pack, characterized in that, Includes the single-cell battery as described in any one of claims 1-9.

Images