Battery cell, battery pack and electric equipment

Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a battery cell, a battery pack and electric equipment. The provided battery cell comprises a shell, a pole group, a cover plate and an anti-explosion valve, the wall thickness of the shell is t2; the pole group is arranged in the shell; the cover plate is arranged at the open end of the shell; in the thickness direction of the cover plate, the projection area of the cover plate is S2; the anti-explosion valve is arranged on the cover plate, a nick is formed in the end face of the anti-explosion valve in the thickness direction of the anti-explosion valve, an opening face is defined by one side of the nick, and the projection area of the opening face is S0; the peak value of the gas production rate during thermal runaway of the battery cell is V; 1000 * S0 / S2 / V * t2 is larger than or equal to 0.08 s / m < 2 > and smaller than or equal to 0.25 s / m < 2 >; 1000 * S0 / S2 / V * t2 is greater than or equal to 0.08 s / m < 2 > and less than or equal to 0.2 s / m < 2 >. According to the battery cell, when thermal runaway occurs, generated gas can be timely and directionally exhausted without suffocation, and the battery cell has excellent safety performance.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery technology, and more particularly to a battery cell, battery pack, and electrical device. Background Technology

[0002] When a battery cell experiences thermal runaway, a large amount of gas is generated inside, causing the internal pressure of the battery cell to increase. If the explosion-proof valve on the battery cell cannot be released quickly and in time after it opens, it can easily lead to cracking of the casing and side spraying. Summary of the Invention

[0003] In view of this, the present invention aims to at least partially solve one of the technical problems in the related art. To this end, the present invention provides a battery cell, a battery pack, and an electrical device that allows the gas generated when the battery cell experiences thermal runaway to be promptly and directionally discharged by an explosion-proof valve, preventing gas stagnation; at the same time, the casing, and the space between the casing and the cover plate, will not crack or break, effectively preventing the battery cell from side-blowing and causing safety incidents, thus giving the battery cell superior safety performance.

[0004] To solve the above-mentioned technical problems, the present invention is implemented as follows: According to one aspect of the present invention, a battery cell is provided, comprising: A housing, the wall thickness of which is t2; The pole assembly is located within the housing; A cover plate is provided at the open end of the housing; the projected area of ​​the cover plate in the thickness direction is S2; An explosion-proof valve is provided on the cover plate. In the thickness direction of the explosion-proof valve, a groove is provided on the end face of the explosion-proof valve. An opening surface is formed by surrounding one side of the groove. The projected area of ​​the opening surface is S0. The peak gas generation rate during thermal runaway of the battery cell is V; wherein, when the battery cell is an energy storage cell, S0, S2, V and t2 satisfy: 0.10 s / m 2 ≤1000*S0 / S2 / V*t2≤0.25s / m 2 ; When the battery cell is a power battery cell, S0, S2, V, and t2 satisfy: 0.08 s / m 2 ≤1000*S0 / S2 / V*t2≤0.2s / m 2 .

[0005] In some embodiments, when the cell is an energy storage cell, the total gas production during thermal runaway of the cell is Q, and S0, S2, Q, and t2 satisfy: 0.07m -2 ≤1000*S0 / S2 / Q*t2≤0.15m -2 .

[0006] In some of these embodiments, when the cell is an energy storage cell, V also satisfies: 180L / s≤V≤450L / s.

[0007] In some of these embodiments, when the cell is an energy storage cell, Q also satisfies: 250L≤Q≤800L.

[0008] In some embodiments, when the battery cell is a power battery cell, the total gas production during thermal runaway of the battery cell is Q, and S0, S2, Q, and t2 satisfy: 0.05m -2 ≤1000*S0 / S2 / Q*t2≤0.10m -2 .

[0009] In some of these embodiments, when the battery cell is a power battery cell, the V also satisfies: 120L / s≤V≤300L / s.

[0010] In some of these embodiments, when the battery cell is a power battery cell, Q also satisfies: 200L≤Q≤600L.

[0011] In some of these embodiments, 200mm 2 ≤S0≤1200mm 2 .

[0012] In some of these embodiments, 2200mm 2 ≤S2≤7000mm 2 .

[0013] In some of these implementations, 0.2mm ≤ t2 ≤ 0.25mm.

[0014] In some embodiments, the thickness of the cover plate is t1 in the thickness direction, wherein t1 satisfies: 0.8mm≤t1≤1.2mm.

[0015] In some embodiments, the length of the cover plate is L2, where 90 mm ≤ L2 ≤ 180 mm.

[0016] In some embodiments, the width of the cover plate is W2, where 25mm ≤ W2 ≤ 50mm.

[0017] In some of these embodiments, the tensile strength of the housing is Rm, where Rm ≥ 520 MPa.

[0018] In some of these embodiments, the elastic modulus of the shell is 190 GPa to 210 GPa.

[0019] In some embodiments, at least one of the housing, the cover, and the explosion-proof valve is made of 304 stainless steel or 316 stainless steel; The chemical composition of the 304 stainless steel includes: C≤0.08%, Cr18%~20%, Ni8%~10.5%, Si≤1.0%, Mn≤2.0%, P≤0.045%, S≤0.030%, and other elements.

[0020] In some embodiments, the chemical composition of the 316 stainless steel includes: C≤0.08%, Cr16-18.5%, Ni10%~14%, Mo2%~3%, Si≤1.0%, Mn≤2.0%, S≤0.030%, P≤0.035%, and other elements.

[0021] According to a second aspect of the present invention, a battery pack is provided, comprising: the battery cell described in any embodiment of the first aspect of the present invention.

[0022] According to a third aspect of the present invention, the present invention provides an electrical device comprising: a battery cell as described in any embodiment of the first aspect of the present invention; And / or, the battery pack described in the second aspect of the present invention.

[0023] Implementing the technical solution of the present invention has at least the following beneficial effects: 1. In this invention, by rationally designing the opening surface of the explosion-proof valve, the cover plate, and the wall thickness of the shell to match the gas generation rate during thermal runaway of the battery cell, the battery cell can have excellent safety performance. When the battery cell experiences thermal runaway, the generated gas can be discharged in a timely manner by the explosion-proof valve, preventing gas stagnation. At the same time, the shell, as well as the space between the shell and the cover plate, will not crack or break, effectively preventing side spraying of the battery cell and causing safety incidents, thus giving the battery cell even better safety performance.

[0024] 2. In a preferred embodiment of the present invention, the opening surface of the explosion-proof valve, the cover plate, and the wall thickness of the shell can also satisfy a certain relationship with the gas production volume during thermal runaway of the battery cell. This ensures that when thermal runaway occurs, the projected area of ​​the opening surface, the projected area of ​​the cover plate, etc., are matched with the gas production rate. When the gas production volume is large, the explosion-proof valve can open in time, and the exhaust volume of the explosion-proof valve matches the gas production rate, thus preventing gas stagnation inside the battery cell. At the same time, the shell also has a certain structural strength and is not prone to cracking or damage, which could cause side spraying.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0027] Figure 1 The diagram shown is a schematic diagram of the shell structure provided by the present invention.

[0028] Figure 2 The diagram shown is a schematic diagram of the cover plate structure provided by the present invention.

[0029] Figure 3 The figure shown is a schematic diagram of the planar structure of the cover plate provided by the present invention.

[0030] Figure 4 The diagram shown is a schematic diagram of the explosion-proof valve structure provided by the present invention.

[0031] Figure 5 The figure shown is a schematic diagram of the planar structure of the explosion-proof valve provided by the present invention.

[0032] Figure 6 The diagram shown is a schematic diagram of the battery cell structure provided by the present invention.

[0033] Explanation of reference numerals in the attached figures: 10 — Battery cell; 100 – Housing; 200 – Cover plate; 300 – Pole post; 400 – Pole assembly; 500 – Explosion-proof valve; 510 – Score; 511 – Continuous material section; 512 – Opening section; 520 – Opening surface; 530 – Transition section; 540 – Skirt.

[0034] The accompanying drawings have illustrated specific embodiments of the invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0035] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0036] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges or individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0037] Unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form new technical solutions.

[0038] Unless otherwise specified, all technical features and optional technical features of this invention can be combined to form new technical solutions.

[0039] Unless otherwise specified, all steps of the present invention may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0040] Unless otherwise specified, the terms "comprising" and "including" as used in this invention can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0041] When a battery cell experiences thermal runaway, a large amount of gas is generated inside the cell. Due to differences in the active materials and electrolyte composition within the cell, the amount and rate of gas generation vary considerably. If the amount and rate of gas generation are large, an explosion-proof valve of appropriate size is required to quickly and promptly release the gas and relieve pressure. This effectively prevents gas buildup inside the cell and also prevents the casing from cracking, thus ensuring the safety performance of the battery cell.

[0042] In view of the technical problems existing in the prior art, the present invention provides a battery cell, battery pack and electrical equipment that can ensure that when the battery cell experiences thermal runaway, the generated gas can be discharged in a timely manner by an explosion-proof valve, preventing gas stagnation; at the same time, the casing and the space between the casing and the cover plate will not crack or break, effectively preventing the battery cell from side-blowing and causing safety incidents, thus giving the battery cell superior safety performance.

[0043] The specific technical solution of the present invention is as follows: In some embodiments of the present invention, a battery cell is provided, comprising: Shell 100, the wall thickness of shell 100 is t2; The pole group 400 is located in the housing 100; A cover plate 200 is provided at the open end of the housing 100; the projected area of ​​the cover plate 200 in the thickness direction is S2. An explosion-proof valve 500 is mounted on a cover plate 200. In the thickness direction of the explosion-proof valve 500, a notch 520 is provided on the end face of the explosion-proof valve 500. An opening surface 520 is formed on one side of the notch 510. The projected area of ​​the opening surface 520 is S0.

[0044] refer to Figures 1 to 6 As an example, the housing 100 is made of materials such as aluminum foil, copper foil, or aluminum alloy. The housing 100 has a receiving space for installing the electrode assembly 400, electrode tabs, and connecting pieces. The cover plate 200 is located at the open end of the housing 100. The cover plate 200 and the housing 100 can be connected by welding or bonding. Of course, those skilled in the art will understand that plastic pads can be provided on both sides of the cover plate 200 in the thickness direction. The plastic pads can be made of insulating materials such as rubber or polyolefin. The cover plate 200 may also be provided with a through hole, on which an explosion-proof valve 500 or a pole post 300 may be installed. In the thickness direction of the explosion-proof valve 500, a notch 510 is provided on the end face of the explosion-proof valve 500. It can be understood that the notch 510 may be located on the side close to the pole group 400 or on the side away from the pole group 400. One side of the notch 510 forms an opening surface 520, that is, the notch 510 forms a closed shape, which may be a rectangle, ring, circle or ellipse or any other shape. The other side of the notch 510 is surrounded by a transition part 530, and the periphery of the transition part 530 is surrounded by a skirt 540. It can also be understood that in the thickness direction of the explosion-proof valve 500, the thickness of the notch 510 is less than the thickness of the opening surface 520, so that the explosion-proof valve 500 can be opened more easily and effectively from the notch 510 for venting and depressurization.

[0045] In some embodiments, the peak gas generation rate during thermal runaway of cell 10 is V; when cell 10 is an energy storage cell, S0, S2, V and t2 satisfy: 0.10 s / m 2 ≤1000*S0 / S2 / V*t2≤0.25s / m 2 .

[0046] It is understood that the wall thickness of the housing 100 is t2, and the area of ​​the cover plate 200 on the side away from the electrode group 400 is S2. For example, the length of the cover plate 200 is L2, and the width of the cover plate 200 is W2. Then the projected area of ​​the cover plate 200 is L2*W2. It is understood that if the cover plate 200 is provided with a through hole for installing and connecting the explosion-proof valve 500 and the pole post 300, then the area of ​​the cover plate 200 also needs to take into account the area of ​​the through hole. The area of ​​the opening surface 520 on the side away from the electrode group 400 is S0. When the cell 10 experiences thermal runaway, the peak gas production rate of the cell 10 is V, V The unit is L / s (liters per second). When cell 10 experiences thermal runaway, the amount of gas produced may vary depending on the electrolyte, electrode active material, diaphragm, electrolyte content, or diaphragm thickness. This difference in gas production may lead to different internal pressures during thermal runaway. Furthermore, it's understandable that the cell could be a power cell or an energy storage cell. Different cells experience thermal runaway for different reasons, and their volumes may also differ. Therefore, the peak gas production rate V may or may not differ.

[0047] Since the gas production rate in the battery cells may vary, to prevent the explosion-proof valve 500 from failing to release gas in a timely and rapid manner, which could lead to cracking of the casing 100, it is necessary to design a casing 100 wall thickness, cover plate 200 area, and opening surface 520 area that are compatible with the gas production rate of the battery cells during thermal runaway. Therefore, it can be understood that when the battery cell 10 is an energy storage cell, the ratio of 1000*S0 / S / V*t2 can be 0.10s / m 2 0.11s / m 2 0.12s / m 2 0.13s / m 2 0.14s / m 2 0.15s / m 2 0.16s / m 2 0.17s / m 2 0.18s / m 2 0.19s / m 2 0.20s / m 2 0.21s / m 2 0.22s / m 2 0.23s / m 2 0.24s / m 2 Or 0.25s / m 2The ratio range can be defined by any one of the values ​​or any point between any two of the values. By limiting the range of the ratio, it is possible to effectively prevent thermal runaway of the battery cell 10. For battery cells 10 with different peak gas production rates, the explosion-proof valve 500 can open in time to release gas and pressure. The housing 100 has good structural strength and is not prone to cracking that could lead to side spraying. In other words, the explosion-proof valve 500 has a peak gas production rate that is compatible with the gas production volume, and there will be no gas stagnation in the battery cell 10. This allows the battery cell 10 to release gas in a directional manner, improving the safety performance of the battery cell 10. If the ratio is not within this range, the gas production volume and the size of the explosion-proof valve may not be compatible, resulting in the gas not being discharged in a timely and effective manner, causing gas stagnation. In fact, it may even cause the housing to crack and side spraying, posing a significant safety hazard to telecommunications.

[0048] As an example, when cell 10 is a power cell, S0, S2, V, and t2 satisfy: 0.08s / m 2 ≤1000*S0 / S2 / V*t2≤0.2s / m 2 .

[0049] Those skilled in the art will understand that, given that the gas production rate of cell 10 is V, for example, if thermal runaway occurs within cell 10, the internal reaction is violent, resulting in a rapid gas production rate and a potential instantaneous increase in pressure within cell 10; conversely, if the internal reaction is not particularly violent, the gas production rate may be slower, leading to a gradual increase in pressure within cell 10. Therefore, the directional exhaust rate of cell 10 and the wall thickness of casing 100 must be adapted to the gas production rate. If cell 10 is a power cell, the ratio of 1000*S0 / S / V*t2 can be 0.08 s / m. 2 0.09s / m 2 0.10s / m 2 0.11s / m 2 0.12s / m 2 0.15s / m 2 0.18s / m 2 or 0.20s / m 2The ratio range of the above relationship can be defined so that the area of ​​the opening surface 520, the area of ​​the cover plate 200, etc., can be matched with the gas production rate when thermal runaway occurs in the battery cell 10. For example, if the gas production rate V is large, the explosion-proof valve 500 needs to open in time, and the exhaust rate of the explosion-proof valve 500 should match V. This will prevent gas from being trapped inside the battery cell 10, and the housing 100 will also have a certain structural strength, making it less prone to cracking or damage, and causing side spraying. If the above relationship is not within the above range, V and the exhaust rate of the explosion-proof valve 500 may not match, which may easily cause gas trapping, delayed opening of the explosion-proof valve 500, and cracking of the housing 100, thus affecting the safety performance of the battery cell 10.

[0050] The battery cell provided by this invention, through reasonable design, adapts the opening surface of the explosion-proof valve, the cover plate, and the wall thickness of the shell to the gas generation rate during thermal runaway of the battery cell, enabling the battery cell to have excellent safety performance. When the battery cell experiences thermal runaway, the generated gas can be discharged in a timely and directional manner by the explosion-proof valve, preventing gas stagnation. At the same time, the shell, and the space between the shell and the cover plate, will not crack or break, effectively preventing side ejection of the battery cell and causing safety incidents, thus giving the battery cell even better safety performance.

[0051] In some embodiments, when cell 10 is an energy storage cell, the total amount of gas generated during thermal runaway of cell 10 is Q, where S0, S2, Q, and t2 satisfy: 0.07m -2 ≤1000*S0 / S2 / Q*t2≤0.15m -2 .

[0052] It is understandable that the ratio of 1000*S0 / S / Q*t2 can be 0.07m. -2 0.08m -2 0.09m -2 0.10m -2 0.11m -2 0.12m -2 0.13m -2 0.14m -2 or 0.15m -2The ratio range can be defined by any one of the values ​​or any point between any two of the values. By limiting the range of the above ratio, it is possible to effectively prevent thermal runaway of the battery cell. For battery cells with different gas production rates, the explosion-proof valve 500 can open in time to vent and relieve pressure. The housing 100 has good structural strength and is not prone to cracking that could lead to side spraying. In other words, the explosion-proof valve 500 has a venting capacity that matches the gas production rate, preventing gas from accumulating inside the battery cell. This allows the battery cell to release gas in a directional manner, improving its safety performance. If the ratio is not within this range, the gas production rate and the size of the explosion-proof valve may not match, resulting in the gas not being able to be discharged in a timely and effective manner, causing gas accumulation. In fact, it may even cause the housing to crack and lead to side spraying, thus posing a significant safety hazard to the battery cell 10.

[0053] In some embodiments, when cell 10 is an energy storage cell, V also satisfies: 180L / s≤V≤450L / s.

[0054] It is understood that the gas production rate V of the energy storage cell 10 can be any one of 180L / s, 200L / s, 220L / s, 250L / s, 260L / s, 270L / s, 300L / s, 320L / s, 350L / s, 380L / s, 400L / s, 420L / s, 440L / s, or 450L / s, or any point value between any two. By limiting the gas production rate V, the safety performance of the cell 10 can be effectively improved. For example, if the gas production rate V is greater than the above range, the internal pressure of the cell 10 may increase sharply, which may cause the explosion-proof valve 500 to fail to open in a timely and effective manner, and the pressure at various locations inside the cell 10 to be unstable and uneven, and the casing 100 may crack.

[0055] In some embodiments, when cell 10 is an energy storage cell, Q also satisfies: 250L≤Q≤800L.

[0056] It is understandable that the gas production Q of the energy storage cell 10 can be any one of 250L, 260L, 300L, 400L, 500L, 550L, 600L, 700L, 750L, or 800L, or any value between any two. By limiting the gas production of the cell 10, the internal pressure of the cell 10 can be better controlled, so that the casing 100 has good structural strength, avoids cracking of the casing 100 and side spraying, and thus gives the cell 10 good safety performance.

[0057] In some embodiments, when cell 10 is a power cell, the total amount of gas generated during thermal runaway of cell 10 is Q, where S0, S2, Q and t2 satisfy: 0.05m -2 ≤1000*S0 / S2 / Q*t2≤0.10m -2 .

[0058] It is understandable that the ratio of 1000*S0 / S / Q*t2 can be 0.05m. -2 0.06m -2 0.07m -2 0.08m -2 0.09m -2 0.10m -2 0.12m -2 0.14m -2 0.16m -2 0.18m -2 or 0.20m -2 The ratio can be any one of the values ​​or any point between any two of the values. By limiting the range of the above ratio, it is possible to effectively prevent thermal runaway of the battery cell. For battery cells with different gas production rates, the explosion-proof valve 500 can open in time to vent and relieve pressure. The housing 100 has good structural strength and is not prone to cracking that could lead to side spraying. In other words, the explosion-proof valve 500 has a venting capacity that matches the gas production rate, preventing gas from accumulating inside the battery cell. This allows the battery cell to release gas in a directional manner, improving its safety performance. If the above ratio is not within this range, the gas production rate and the size of the explosion-proof valve may not match, resulting in the gas not being able to be discharged in a timely and effective manner, causing gas accumulation. In fact, it may even cause the housing to crack and lead to side spraying, posing a significant safety hazard to the battery cell.

[0059] In some embodiments, when cell 10 is a power cell, V also satisfies: 120L / s≤V≤300L / s.

[0060] It is understandable that the gas production rate V of the power cell 10 can be any one of 120L / s, 130L / s, 140L / s, 150L / s, 160L / s, 170L / s, 180L / s, 190L / s, 200L / s, 220L / s, 240L / s, 260L / s, 280L / s, or 300L / s, or any point value between any two. By limiting the gas production rate V, the safety performance of the cell 10 can be effectively improved. For example, if the gas production rate V is greater than the above range, the internal pressure of the cell 10 may increase sharply, which may cause the explosion-proof valve 500 to fail to open in a timely and effective manner, and the pressure at various locations inside the cell 10 to be unstable and uneven, and the casing 100 may be prone to cracking.

[0061] In some embodiments, when cell 10 is a power cell, Q also satisfies: 200L≤Q≤600L.

[0062] It is understandable that the gas production Q of the power cell 10 can be any one of 200L, 220L, 240L, 260L, 280L, 300L, 350L, 400L, 500L or 600L, or any value between any two. By limiting the gas production of the above-mentioned cell 10, the internal pressure of the cell 10 can be better controlled, so that the casing 100 has good structural strength, avoids cracking of the casing 100 and side spraying, and thus gives the cell 10 good safety performance.

[0063] In some embodiments, 200mm 2 ≤S0≤1200mm 2 .

[0064] It is understandable that the area S0 of the opening surface 520 can be 200 mm². 2 240mm 2 250mm 2 300mm 2 400mm 2 500mm 2 600mm 2 700mm 2 800mm 2 900mm 2 1000mm 2 Or 1200mm 2 Any point value between any one or any two of them; similarly, by limiting the area size of the opening surface 520, the amount or rate of gas generated when the opening surface 520 and the cell 10 undergo thermal runaway can be matched, so that the generated gas will not be trapped inside the cell 10, which may cause the casing 100 to crack, etc.; or the opening surface 520 may not be able to open effectively.

[0065] In some embodiments, 2200mm 2 ≤S2≤7000mm 2 .

[0066] It is understandable that the area S2 of the cover plate 200 can be 2200mm². 2 2500mm 2 3000mm 2 3500mm 2 4000mm 2 4500mm 2 5000mm 2 5500mm 2 6000mm 2 6200mm 2 6500mm 2 6800mm2 Or 7000mm 2 The value of any one or any two of them; similarly, by limiting the area of ​​the cover plate 200, the housing 100 and the cover plate 200 can be better and more firmly connected, so that when the battery cell 10 experiences thermal runaway, it will not cause cracks between the cover plate 200 and the housing 100, thus avoiding safety risks; at the same time, it can also make the explosion-proof valve 500 have a certain area, so that gas can be discharged in time, avoiding gas suffocation and affecting the safety performance of the battery cell.

[0067] In some embodiments, 0.2mm ≤ t2 ≤ 0.25mm.

[0068] It is understandable that the wall thickness t2 of the casing 100 can be any one of 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, or 0.25mm, or any value between any two. The thickness of the casing 100 ensures good structural strength, allowing it to withstand the pressure generated by gas production inside the battery cell without cracking. Simultaneously, it prevents deformation of the casing 100 during battery cell collisions, which could potentially damage internal components. If the thickness of the casing 100 is less than the aforementioned range, it may be prone to cracking and side ejection during thermal runaway; it may also be prone to deformation during collisions, easily damaging internal components. Furthermore, a thickness less than the aforementioned range may result in wasted raw materials and increased costs.

[0069] In some embodiments, the thickness of the cover plate 200 in the thickness direction is t1, and t1 satisfies: 0.8mm≤t1≤1.2mm.

[0070] As an example, it can be understood that the thickness t1 of the cover plate 200 can be any one of 0.8mm, 0.9mm, 1.0mm, 1.1mm or 1.2mm or any value between any two; by limiting the thickness of the cover plate 200, the cover plate 200 can have good structural strength, so that if the battery cell 10 experiences thermal runaway and air suffocation occurs, the cover plate 200 will not easily deform, causing damage to the entire battery cell 10.

[0071] In some embodiments, the length of the cover plate 200 is L2, where 90 mm ≤ L2 ≤ 180 mm.

[0072] As an example, it can be understood that the length L2 of the cover plate 200 can be any one of 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, or 180mm, or any value between any two. By limiting the length range of the cover plate, the shape of the effective opening surface 520 of the explosion-proof valve 500 can be well controlled. When the area of ​​the cover plate 200 is fixed, if the length of the cover plate 200 is too long and the width is too narrow, the cover plate 200 will form a long strip shape, causing the explosion-proof valve 200 to also form the aforementioned shape. Compared with rectangular or elliptical shapes of the same area, this shape has a higher airflow rate during the exhaust process, resulting in a greater impact force on the cover plate 200, which can easily cause the cover plate 200 to fall off the housing 100, thereby damaging the battery cell 10. Moreover, this type of explosion-proof valve 500 is also easily blocked, which can easily cause the explosion-proof valve 500 to have poor exhaust, affecting the safety performance of the battery cell 10.

[0073] In some embodiments, the width of the cover plate 200 is W2, where 25mm ≤ W2 ≤ 50mm.

[0074] As an example, it can be understood that the length W2 of the cover plate 200 can be any one of 25mm, 28mm, 30mm, 32mm, 35mm, 40mm, 45mm, or 50mm, or any value between any two. Similarly, by limiting the width range of the cover plate 200, the shape of the effective opening surface 520 of the explosion-proof valve 500 can be well controlled. When the area of ​​the cover plate 200 is fixed, if the length of the cover plate 200 is too short and the width is too long, the cover plate 200 will form a long strip shape, causing the explosion-proof valve 200 to also form the aforementioned shape. Compared with rectangular, elliptical, or other shapes of the same area, this shape has a higher airflow rate during the exhaust process, resulting in a greater impact force on the cover plate 200. This can easily cause the cover plate 200 to fall off the housing 100, thereby damaging the battery cell 10. Moreover, this type of explosion-proof valve 500 is also easily blocked, which can easily cause the explosion-proof valve 500 to have poor exhaust, affecting the safety performance of the battery cell 10.

[0075] In some embodiments, the tensile strength of the housing 100 is Rm, where Rm ≥ 520 MPa.

[0076] It is understandable that the tensile strength Rm of the casing 100 can be any one of 520 MPa, 550 MPa, 580 MPa, 600 MPa, 650 MPa or 690 MPa or higher, or any value between any two. By limiting the tensile strength of the casing 100, it is possible to ensure that the casing 100 has good structural strength and improve the safety performance of the battery cell.

[0077] In some embodiments, the elastic modulus of the housing 100 is 190 GPa to 210 GPa.

[0078] It is understood that the elastic modulus of the housing 100 can be any one of 190GPa, 195GPa, 200GPa, 205GPa or 210GPa or any point value between any two; by limiting the elastic modulus of the housing 100, it is possible to ensure that the housing 100 has excellent mechanical properties, thereby better improving the problem of side spraying when the battery cell 10 experiences thermal runaway.

[0079] In some embodiments, at least one of the housing 100, the cover plate 200, and the explosion-proof valve 500 is made of 304 stainless steel or 316 stainless steel. The chemical composition of 304 stainless steel includes: C≤0.08%, Cr18%~20%, Ni8%~10.5%, Si≤1.0%, Mn≤2.0%, P≤0.045%, S≤0.030%, and other elements.

[0080] In some embodiments, the chemical composition of 316 stainless steel includes: C≤0.08%, Cr16-18.5%, Ni10%~14%, Mo2%~3%, Si≤1.0%, Mn≤2.0%, S≤0.030%, P≤0.035%, and other elements.

[0081] It is understood that other components of 304 stainless steel and 316 stainless steel include, but are not limited to, Fe, as well as other unavoidable impurity elements. These other components are well known to those skilled in the art and will not be described or limited in detail here. By limiting the component ratio of stainless steel, the shell 100 and the battery cell 10 can have better structural strength to a certain extent, thus ensuring the safety performance of the battery cell 10.

[0082] In some embodiments of the present invention, a battery pack is provided, comprising: the battery cells in any of the above embodiments.

[0083] In some embodiments of the present invention, an electrical device is provided, comprising: the battery cell in any of the above embodiments.

[0084] In some embodiments, the electrical device includes the battery pack described in any of the above embodiments.

[0085] Optionally, the battery cell may further include a positive electrode, a negative electrode, and a separator. As an example, the positive electrode includes a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector along its thickness direction. The phrase "positive active material layer disposed on at least one surface of the positive current collector" means that the positive active material layer can be disposed on one surface or two surfaces of the positive current collector along its thickness direction. Here, "surface" can refer to the entire area of ​​the positive current collector or only a portion of it; this application does not impose any particular limitation, as long as the purpose of this application is achieved. In this invention, the separator is not particularly limited, as long as the purpose of this invention is achieved. Optionally, the separator includes, but is not limited to, at least one polymer separator selected from polyethylene, polypropylene, polyacrylonitrile, polysulfonyl, polyarylethersulfone, polyvinyl alcohol, and polyvinylidene fluoride.

[0086] As examples, electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, energy storage devices, amusement equipment, elevators and lifting equipment, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or 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.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, drop towers, etc. The aforementioned vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle has a battery installed inside, which can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, the battery can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller controls the battery's power supply to the motor, for example, to meet the vehicle's power needs during starting, navigation, and driving. The battery can serve not only as the vehicle's operating power source but also as its driving power source, replacing or partially replacing fuel or natural gas to provide propulsion.

[0087] Since the battery provided in this embodiment of the invention adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0088] The present invention will be described in detail below with reference to the accompanying drawings and examples. However, the implementation and protection of the present invention are not limited thereto. The following embodiments are only some embodiments of the present invention and are not intended to limit the present invention.

[0089] Power battery cells: Example A1 The parameters of the battery cell in Example A1 are as follows: t2 = 0.2 mm, Q = 384 L, V = 148.7 L / s, S0 = 285.9 mm. 2 S2=2200mm 2 1000*S0 / S2 / V*t2=0.17s / m 2 1000*S0 / S2 / Q*t2=0.07m -2 .

[0090] Example A2 The parameters of the battery cell in Example A2 are as follows: t2 = 0.2 mm, Q = 405.6 L, V = 220.2 L / s, S0 = 285.9 mm. 2 S2 = 2210mm 2 1000*S0 / S2 / V*t2=0.12s / m 2 1000*S0 / S2 / Q*t2=0.06m -2 .

[0091] Example A3 The parameters of the battery cell in Example A3 are as follows: t2 = 0.2 mm, Q = 553.7 L, V = 292.5 L / s, S0 = 285.9 mm. 2 S2 = 2236mm 2 1000*S0 / S2 / V*t2=0.09s / m 2 1000*S0 / S2 / Q*t2=0.05m -2 .

[0092] Example A4 The parameters of the battery cell in Example A4 are as follows: t2 = 0.23 mm, Q = 210.5 L, V = 167.2 L / s, S0 = 208.5 mm. 2 S2 = 3360mm 2 1000*S0 / S2 / V*t2=0.09s / m 2 1000*S0 / S2 / Q*t2=0.07m -2 .

[0093] Example A5 The parameters of the battery cell in Example A5 are as follows: t2 = 0.23 mm, Q = 279.1 L, V = 121.7 L / s, S0 = 208.5 mm. 2 S2 = 3360mm 2 1000*S0 / S2 / V*t2=0.12s / m 21000*S0 / S2 / Q*t2=0.05m -2 .

[0094] Example A6 The parameters of the battery cell in Example A6 are as follows: t2 = 0.23 mm, Q = 311 L, V = 173.9 L / s, S0 = 208.5 mm. 2 S2 = 3360mm 2 1000*S0 / S2 / V*t2=0.08s / m 2 1000*S0 / S2 / Q*t2=0.05m -2 .

[0095] Example A7 The parameters of the battery cell in Example A7 are as follows: t2 = 0.23 mm, Q = 255 L, V = 152.6 L / s, S0 = 495 mm. 2 S2 = 4320mm 2 1000*S0 / S2 / V*t2=0.17s / m 2 1000*S0 / S2 / Q*t2=0.10m -2 .

[0096] Example A8 The parameters of the battery cell in Example A8 are as follows: t2=0.25mm, Q=600L, V=278.2L / s, S0=495mm. 2 S2 = 4320mm 2 1000*S0 / S2 / V*t2=0.10s / m 2 1000*S0 / S2 / Q*t2=0.05m -2 .

[0097] Example A9 The parameters of the battery cell in Example A9 are as follows: t2=0.25mm, Q=462.5L, V=245.2L / s, S0=495mm. 2 S2 = 4320mm 2 1000*S0 / S2 / V*t2=0.12s / m 2 1000*S0 / S2 / Q*t2=0.06m -2 .

[0098] Example A10 The parameters of the battery cell in Example A10 are as follows: t2=0.25mm, Q=357.2L, V=149L / s, S0=667mm. 2 S2=5700mm 21000*S0 / S2 / V*t2=0.20s / m 2 1000*S0 / S2 / Q*t2=0.08m -2 .

[0099] Example A11 The parameters of the battery cell in Example A11 are as follows: t2=0.25mm, Q=456L, V=171.9L / s, S0=667mm. 2 S2=6200mm 2 1000*S0 / S2 / V*t2=0.16s / m 2 1000*S0 / S2 / Q*t2=0.06m -2 .

[0100] Example A12 The parameters of the battery cell in Example A12 are as follows: t2=0.25mm, Q=496.8L, V=143.5L / s, S0=667mm² 2 S2=6700mm 2 1000*S0 / S2 / V*t2=0.17s / m 2 1000*S0 / S2 / Q*t2=0.15m -2 .

[0101] Comparative Example A1 The parameters of the battery cell in Comparative Example A1 are as follows: t2 = 0.23 mm, Q = 311 L, V = 193.9 L / s, S0 = 208.5 mm. 2 S2 = 3360mm 2 1000*S0 / S2 / V*t2=0.07s / m 2 1000*S0 / S2 / Q*t2=0.05m -2 .

[0102] Comparative Example A2 The parameters of the battery cell in Comparative Example A2 are as follows: t2 = 0.2 mm, Q = 553.7 L, V = 292.5 L / s, S0 = 265.9 mm. 2 S2 = 2236mm 2 1000*S0 / S2 / V*t2=0.08s / m 2 1000*S0 / S2 / Q*t2=0.04m -2 .

[0103] Comparative Example A3 The parameters of the battery cell in Comparative Example A3 are as follows: t2 = 0.23 mm, Q = 255 L, V = 152.6 L / s, S0 = 535 mm. 2 S2 = 4320mm 2 1000*S0 / S2 / V*t2=0.19s / m 2 1000*S0 / S2 / Q*t2=0.11m -2 .

[0104] Energy storage cells: Example B1 The parameters of the battery cell in Example B1 are as follows: t2=0.2mm, Q=537.6L, V=223.1L / s, S0=535mm. 2 S2=1890mm 2 1000*S0 / S2 / V*t2=0.25s / m 2 1000*S0 / S2 / Q*t2=0.11m -2 .

[0105] Example B2 The parameters of the battery cell in Example B2 are as follows: t2 = 0.25 mm, Q = 437.8 L, V330.3 = L / s, S0 = 512 mm. 2 S2=1890mm 2 1000*S0 / S2 / V*t2=0.21s / m 2 1000*S0 / S2 / Q*t2=0.15m -2 .

[0106] Example B3 The parameters of the battery cell in Example B3 are as follows: t2=0.2mm, Q=775.2L, V=438.8L / s, S0=512mm. 2 S2=1890mm 2 1000*S0 / S2 / V*t2=0.12s / m 2 1000*S0 / S2 / Q*t2=0.07m -2 .

[0107] Example B4 The parameters of the battery cell in Example B4 are as follows: t2 = 0.23 mm, Q = 294.7 L, V = 250.8 L / s, S0 = 355 mm. 2 S2 = 3360mm 2 1000*S0 / S2 / V*t2=0.10s / m 2 1000*S0 / S2 / Q*t2=0.08m-2 .

[0108] Example B5 The parameters of the battery cell in Example B5 are as follows: t2 = 0.23 mm, Q = 390.8 L, V = 182.5 L / s, S0 = 464 mm. 2 S2 = 3360mm 2 1000*S0 / S2 / V*t2=0.17s / m 2 1000*S0 / S2 / Q*t2=0.08m -2 .

[0109] Example B6 The parameters of the battery cell in Example B6 are as follows: t2=0.23mm, Q=506.7L, V=260.9L / s, S0=512mm. 2 S2 = 3360mm 2 1000*S0 / S2 / V*t2=0.13s / m 2 1000*S0 / S2 / Q*t2=0.07m -2 .

[0110] Example B7 The parameters of the battery cell in Example B7 are as follows: t2 = 0.23 mm, Q = 519 L, V = 228.9 L / s, S0 = 807.5 mm. 2 S2 = 4320mm 2 1000*S0 / S2 / V*t2=0.19s / m 2 1000*S0 / S2 / Q*t2=0.08m -2 .

[0111] Example B8 The parameters of the battery cell in Example B8 are as follows: t2 = 0.25 mm, Q = 647.5 L, V = 367.8 L / s, S0 = 807.5 mm. 2 S2 = 4320mm 2 1000*S0 / S2 / V*t2=0.13s / m 2 1000*S0 / S2 / Q*t2=0.07m -2 .

[0112] Example B9 The parameters of the battery cell in Example B9 are as follows: t2 = 0.25 mm, Q = 647.5 L, V = 367.8 L / s, S0 = 807.5 mm. 2 S2 = 4320mm 21000*S0 / S2 / V*t2=0.13s / m 2 1000*S0 / S2 / Q*t2=0.07m -2 .

[0113] Example B10 The parameters of the battery cell in Example B10 are as follows: t2 = 0.25 mm, Q = 500.1 L, V = 210 L / s, S0 = 950 mm. 2 S2=5700mm 2 1000*S0 / S2 / V*t2=0.20s / m 2 1000*S0 / S2 / Q*t2=0.08m -2 .

[0114] Example B11 The parameters of the battery cell in Example B11 are as follows: t2 = 0.25 mm, Q = 638.4 L, V = 257.8 L / s, S0 = 1200 mm. 2 S2=6800mm 2 1000*S0 / S2 / V*t2=0.17s / m 2 1000*S0 / S2 / Q*t2=0.07m -2 .

[0115] Example B12 The parameters of the battery cell in Example B12 are as follows: t2=0.25mm, Q=621L, V=243L / s, S0=1120mm. 2 S2=5700mm 2 1000*S0 / S2 / V*t2=0.20s / m 2 1000*S0 / S2 / Q*t2=0.08m -2 .

[0116] Comparative Example B1 The parameters of the battery cell in Comparative Example B1 are as follows: t2 = 0.23 mm, Q = 294.7 L, V = 267 L / s, S0 = 355 mm. 2 S2 = 3360mm 2 1000*S0 / S2 / V*t2=0.09s / m 2 1000*S0 / S2 / Q*t2=0.08m -2 .

[0117] Comparative Example B2 The parameters of the battery cell in Comparative Example B2 are as follows: t2 = 0.23 mm, Q = 506.7 L, V = 260.9 L / s, S0 = 464 mm. 2 S2 = 3360mm 2 1000*S0 / S2 / V*t2=0.12s / m 2 1000*S0 / S2 / Q*t2=0.06m -2 .

[0118] Comparative Example B3 The parameters of the battery cell in Comparative Example B3 are as follows: t2 = 0.25 mm, Q = 437.8 L, V = 330.3 L / s, S0 = 537 mm. 2 S2=1890mm 2 1000*S0 / S2 / V*t2=0.22s / m 2 1000*S0 / S2 / Q*t2=0.16m -2 .

[0119] Performance testing: 1. Power battery cell, heating triggers thermal runaway To verify the rationality of the explosion-proof valve area design, different sizes of DOEs were arranged to verify the safety performance of the battery cells. The results are shown in Table 1 below.

[0120] Table 1. Test Results: As shown in Table 1, when the explosion-proof valve area meets the above conditions, all sampled battery cells pass the safety test. When 1000*S0 / S2 / V*t2 is too small or 1000*S0 / S2 / Q*t2 is too small, the effective venting area of ​​the explosion-proof valve is insufficient to match the venting rate and venting volume of the tested battery cells, and the pass rate of the safety test is not high. When S0 is too large, it leads to a reduction in the structural strength of the explosion-proof valve under the same opening pressure, affecting the safety performance of the battery cells.

[0121] 2. Energy storage cells: overcharging triggers thermal runaway. To verify the rationality of the explosion-proof valve area design, different sizes of DOEs were arranged to verify the safety performance of the battery cells. The results are shown in Table 2 below.

[0122] Table 2. Test Results: As shown in Table 2, when the explosion-proof valve area meets the above conditions, all sampled battery cells pass the safety test. When 1000*S0 / S2 / V*t2 is too small or 1000*S0 / S2 / Q*t2 is too small, the effective venting area of ​​the explosion-proof valve is insufficient to match the venting rate and volume of the tested battery cells, resulting in a low pass rate for the safety test. This can lead to situations where the explosion-proof valve of some battery cells can open, but due to insufficient effective opening area design, the venting volume does not match the gas production rate and volume, causing the casing to burst; in some cases, the casing may burst, catch fire, or even explode before the explosion-proof valve opens; when S0 is too large, it reduces the structural strength of the explosion-proof valve under the same opening pressure, affecting the safety performance of the battery cells.

[0123] The parts of this invention not described in detail are techniques known to those skilled in the art.

[0124] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0125] It should be noted that the terms "and / or" or " / " used herein are merely descriptions of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The singular forms "a," "described," and "the" used in the embodiments of the invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0126] In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery cell, characterized in that, include: A housing, the wall thickness of which is t2; The pole assembly is located within the housing; A cover plate is provided at the open end of the housing; In the thickness direction of the cover plate, the projected area of ​​the cover plate is S2; An explosion-proof valve is provided on the cover plate. In the thickness direction of the explosion-proof valve, a groove is provided on the end face of the explosion-proof valve. An opening surface is formed by surrounding one side of the groove. The projected area of ​​the opening surface is S0. The peak gas generation rate during thermal runaway of the battery cell is V; wherein, when the battery cell is an energy storage cell, S0, S2, V and t2 satisfy: 0.10 s / m 2 ≤1000*S0 / S2 / V*t2≤0.25s / m 2 ; When the battery cell is a power battery cell, S0, S2, V, and t2 satisfy: 0.08 s / m 2 ≤1000*S0 / S2 / V*t2≤0.2s / m 2 .

2. The battery cell according to claim 1, characterized in that, When the battery cell is an energy storage cell, the total gas production during thermal runaway of the battery cell is Q, and S0, S2, Q, and t2 satisfy: 0.07m -2 ≤1000*S0 / S2 / Q*t2≤0.15m -2 .

3. The battery cell according to claim 1 or 2, characterized in that, When the battery cell is an energy storage battery cell, V also satisfies: 180L / s≤V≤450L / s; And / or, the Q also satisfies: 250L≤Q≤800L.

4. The battery cell according to claim 1, characterized in that, When the battery cell is a power battery cell, the total gas production during thermal runaway of the battery cell is Q, and S0, S2, Q and t2 satisfy: 0.05m -2 ≤1000*S0 / S2 / Q*t2≤0.10m -2 .

5. The battery cell according to claim 1 or 4, characterized in that, When the battery cell is a power battery cell, V also satisfies: 120L / s≤V≤300L / s; And / or, the Q also satisfies: 200L≤Q≤600L.

6. The battery cell according to claim 1, characterized in that, It satisfies at least one of the following characteristics (1) to (3): (1)200mm 2 ≤S0≤1200mm 2 ;(2)2200mm 2 ≤S2≤7000mm 2 ;(3)0.2mm≤t2≤0.25mm。 7. The battery cell according to claim 1, characterized in that, It satisfies at least one of the following characteristics (1) to (5): (1) In the thickness direction of the cover plate, the thickness of the cover plate is t1, and t1 satisfies: 0.8mm≤t1≤1.2mm; (2) The length of the cover plate is L2, 90mm≤L2≤180mm; (3) The width of the cover plate is W2, 25mm≤W2≤50mm; (4) The tensile strength of the shell is Rm, where Rm≥520MPa; (5) The elastic modulus of the shell is 190 GPa to 210 GPa.

8. The battery cell according to claim 1, characterized in that, At least one of the housing, the cover plate and the explosion-proof valve is made of 304 stainless steel or 316 stainless steel; The chemical composition of the 304 stainless steel includes: C≤0.08%, Cr18%~20%, Ni8%~10.5%, Si≤1.0%, Mn≤2.0%, P≤0.045%, S≤0.030%, and other elements; Alternatively, the chemical composition of the 316 stainless steel includes: C≤0.08%, Cr16-18.5%, Ni10%~14%, Mo2%~3%, Si≤1.0%, Mn≤2.0%, S≤0.030%, P≤0.035%, and other elements.

9. A battery pack, characterized in that, include: The battery cell according to any one of claims 1 to 8.

10. An electrical appliance, characterized in that, include: The battery cell according to any one of claims 1 to 8; And / or, the battery pack of claim 9.

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