Battery monomer, power battery pack and electric equipment

Abstract

The utility model provides a battery monomer, a power battery pack and electric equipment, and the battery monomer comprises a top cover structure which is configured to be distributed along a first direction, and the top cover structure is configured with a mounting hole in a penetrating manner along a second direction; the one-way structure comprises a valve body, an elastic assembly and a sealing assembly, the valve body is connected with the mounting hole, the valve body is provided with a pressure relief channel in the second direction, the elastic assembly and the sealing assembly are both arranged in the pressure relief channel, and the elastic assembly abuts against the sealing assembly so that when the air pressure is larger than deformation of the elastic assembly in the second direction, the sealing assembly can be sealed. And when the air pressure is not greater than the deformation of the elastic assembly in the second direction, the sealing assembly seals the pressure relief channel. And the internal pressure can be kept stable, the expansive force of the battery is better controlled, the performance of the single battery is improved, the service life of the single battery is prolonged, and meanwhile, the safety is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery cell, a power battery pack and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology advantages are an important factor in their development.

[0003] However, during the cycle of the battery, continuous gas production will increase the internal pressure of the battery. Excessive pressure will damage the battery shell structure, causing the explosion-proof valve to blow or leak, or even catch fire. In the battery pack or battery pack, the power batteries are fixed in a group in a restrained space. As the battery continues to produce gas during the cycle, the battery expansion space is limited, resulting in increasing internal pressure, affecting the performance and life of the battery. Extreme pressure may even cause the risk of internal short circuit. At the same time, excessive expansion force will cause deformation of the battery pack structure, welding failure, and damage to the structural frame of the battery pack. Utility Model Content

[0004] The purpose of the present application is to provide a battery cell, a power battery pack and an electrical device that can promptly discharge excess gas generated inside during the cycle, maintain stable internal pressure, better control its own expansion force, improve the performance and life of the battery cell, and ensure safety at the same time.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a battery cell, comprising: a top cover structure, configured to be distributed along a first direction, and the top cover structure is penetrated by a mounting hole along a second direction, wherein the first direction is perpendicular to the second direction; a unidirectional structure, comprising a valve body, an elastic component and a sealing component, the valve body is connected to the mounting hole, the valve body is provided with a pressure relief channel along the second direction, the elastic component and the sealing component are both configured in the pressure relief channel, the elastic component abuts against the sealing component, so that when the air pressure is greater than the deformation of the elastic component along the second direction, the sealing component is pushed to move along the second direction until the pressure relief channel is connected, and when the air pressure is not greater than the deformation of the elastic component along the second direction, the sealing component seals the pressure relief channel.

[0007] In the above-mentioned implementation process, the top cover structure is provided with a mounting hole along the second direction, and the one-way structure is connected to the mounting hole, wherein the valve body is provided with a pressure relief channel along the second direction, and both the elastic component and the sealing component are provided in the pressure relief channel, and the elastic component abuts against the sealing component, so that the gas gradually generated by the battery cell during the cycle forms a certain air pressure. When the air pressure is not enough to deform the elastic component, the sealing component always seals the pressure relief channel under the action of the elastic component, and when the air pressure gradually increases, the elastic component is gradually compressed through the sealing component, and finally the pressure relief channel is opened, thereby discharging excess gas generated inside, maintaining the internal pressure stable, better controlling its own expansion force, improving the performance and life of the battery cell, and ensuring safety at the same time.

[0008] In some embodiments, the sealing assembly includes a valve needle and a sealing member, the sealing member is sleeved on the valve needle, and the sealing member is located on the side of the valve needle away from the elastic member. By sleeved on the valve needle, when the air pressure is insufficient to push the sealing member to move, the elastic member acts on the valve needle, so that the sealing member on the valve needle is closely attached to the pressure relief channel, and has good sealing performance, can isolate external gas and moisture, prevent the internal electrolyte from leaking, and ensure the normal use environment inside the battery cell.

[0009] In some embodiments, the outer edge of the valve needle is provided with a first extension body, and the first extension body is configured to abut against one end of the elastic component. By configuring the first extension body on the outer edge of the valve needle, it is possible to abut not only against the elastic component but also against the seal, ensuring that when the air pressure is greater than the deformation of the elastic component, the seal can be driven to move and the elastic component is gradually compressed. When the gas inside the battery cell is gradually discharged, the air pressure drops until it is less than the elastic deformation of the elastic component, and the elastic component needs to return to its original state, thereby driving the seal to move close to the pressure relief channel, sealing the pressure relief channel, achieving good sealing performance, isolating external gas and moisture, preventing internal electrolyte from leaking, and maintaining a normal use environment inside the battery cell.

[0010] In some embodiments, the elastic component includes an elastic member and an abutment member, one end of the elastic member abuts against the valve needle, and the other end of the elastic member abuts against the abutment member, and the abutment member is connected to the valve body. By abutting the elastic member against the abutment member and the valve needle respectively, the valve needle can be better regulated by the elastic member, and timely exhaust can be achieved to maintain the stability of the gas pressure inside the battery cell, thereby better controlling the expansion force of the battery cell itself, and after the gas escapes, the elastic member can act on the valve needle to restore the sealing of the pressure relief channel.

[0011] In some embodiments, the valve body is provided with a receiving cavity and a pressure relief hole along the second direction, the pressure relief hole is communicated with the receiving cavity to form the pressure relief channel, the receiving cavity is configured to receive a part of the structure of the sealing component and the elastic component, and the pressure relief hole is configured to receive a part of the structure of the sealing component. By configuring a part of the structure of the sealing component in the pressure relief hole, when the air pressure is insufficient to drive the sealing component to move, the sealing component can better contact the pressure relief hole, thereby ensuring the sealing of the valve body, isolating the external gas and moisture, preventing the internal electrolyte from leaking, and maintaining the normal use environment inside the battery cell.

[0012] In some embodiments, the outer edge of the valve body is provided with a second extension body, and the second extension body is connected to the top cover structure. By providing the second extension body on the outer edge of the valve body, the connection between the valve body and the top cover structure can be facilitated, and the stability of the connection between the valve body and the top cover structure can be improved.

[0013] In some embodiments, the top cover structure includes a top cover substrate and a top cover insulating member, the top cover insulating member is connected to the top cover substrate, the mounting hole sequentially passes through the top cover insulating member and the top cover substrate, and when the pressure relief channel is connected, the air pressure flows from the side of the top cover insulating member away from the top cover substrate to the outside of the top cover substrate.

[0014] In some embodiments, the battery cell further comprises a pole, the pole being connected to a side of the top cover substrate away from the top cover insulating member, and the pole being configured to form a positive electrode or a negative electrode. By configuring the pole on the top cover, it is beneficial to the subsequent series and parallel connection between battery cells, and it is convenient to assemble the battery cells into the shell, thereby improving the assembly efficiency of the battery pack.

[0015] In some embodiments, the battery cell further includes an explosion-proof valve connected to the top cover structure.

[0016] In a second aspect, the present application also provides a power battery pack, comprising a battery cell as described in any one of the above items.

[0017] Since the power battery pack provided in the second embodiment of the present application includes the battery cells described in the technical solution of the first aspect, it has all the technical effects of the above embodiments and will not be described in detail here.

[0018] In a third aspect, the present application also provides an electrical device, comprising the power battery pack as described above.

[0019] Since the electrical equipment provided in the third embodiment of the present application includes the power battery pack described in the second technical solution, it has all the technical effects of the above embodiments and will not be repeated here.

[0020] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For users of ordinary technology in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the structure of a battery cell disclosed in an embodiment of the present application.

[0023] Figure 2 It is a partial structural schematic diagram of a battery cell disclosed in an embodiment of the present application.

[0024] Figure 3 It is a partial structural cross-sectional view of a battery cell disclosed in an embodiment of the present application.

[0025] Reference numerals

[0026] 100, top cover structure; 101, top cover substrate; 102, top cover insulating member; 200, one-way structure; 201, valve body; 202, second extension body; 203, elastic member; 204, abutment member; 205, sealing member; 206, valve needle; 207, first extension body; 208, pressure relief hole; 300, pole; 400, explosion-proof valve. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by users of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technical users in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] Example

[0034] In the present application, battery cells may include lithium-ion battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells or magnesium-ion battery cells, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0035] The battery cell is provided with an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current can be passed without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be polypropylene (PP) or polyethylene (PE). In addition, the electrode assembly can be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0036] like Figure 1-Figure 3 As shown, in the first aspect, the present application provides a battery cell, including: a top cover structure 100, configured to be distributed along a first direction, and the top cover structure 100 is penetrated by a mounting hole along a second direction, wherein the first direction is perpendicular to the second direction; a unidirectional structure 200, including a valve body 201, an elastic component and a sealing component, the valve body 201 is connected to the mounting hole, the valve body 201 is configured with a pressure relief channel along the second direction, the elastic component and the sealing component are both configured in the pressure relief channel, the elastic component abuts against the sealing component, so that when the air pressure is greater than the deformation of the elastic component along the second direction, the sealing component is pushed to move along the second direction until the pressure relief channel is connected, and when the air pressure is not greater than the deformation of the elastic component along the second direction, the sealing component seals the pressure relief channel.

[0037] Taking the battery cell as an example of a long strip, the battery cell also includes a battery shell, the top cover structure 100 is connected to the upper end of the battery shell, the battery shell is distributed along the first direction, the first direction includes but is not limited to the left and right direction, the second direction includes but is not limited to the up and down direction, the position where the unidirectional structure 200 is arranged on the top cover structure 100 is not specifically limited, and can be located in the middle of the top cover structure 100, or on the left side of the top cover structure 100, or on the right side of the top cover structure 100, etc.

[0038] In the above-mentioned implementation process, the top cover structure 100 is provided with a mounting hole along the second direction, and the one-way structure 200 is connected to the mounting hole, wherein the valve body 201 is provided with a pressure relief channel along the second direction, and both the elastic component and the sealing component are provided in the pressure relief channel, and the elastic component abuts against the sealing component, so that the gas gradually generated by the battery cell during the cycle forms a certain air pressure. When the air pressure is not enough to deform the elastic component, the sealing component always seals the pressure relief channel under the action of the elastic component, and when the air pressure gradually increases, the elastic component is gradually compressed through the sealing component, and finally the pressure relief channel is opened, thereby discharging the excess gas generated inside, maintaining the internal pressure stable, better controlling its own expansion force, improving the performance and life of the battery cell, and ensuring safety at the same time.

[0039] like Figure 3 The sealing assembly includes a valve needle 206 and a sealing member 205. The sealing member 205 includes but is not limited to a sealing ring. The sealing member 205 is sleeved on the valve needle 206, and the sealing member 205 is located on the side of the valve needle 206 away from the elastic member. By sleeved the sealing member 205 on the valve needle 206, when the air pressure is insufficient to push the sealing member to move, the elastic member acts on the valve needle 206, so that the sealing member 205 on the valve needle 206 is closely attached to the pressure relief channel, and has good sealing performance, can isolate external gas and moisture, prevent the internal electrolyte from leaking, and ensure the normal use environment inside the battery cell.

[0040] In some embodiments, the outer edge of the valve needle 206 is provided with a first extension body 207. The first extension body 207 and the valve needle 206 may be integrally formed or formed in other ways. The first extension body 207 is configured to abut against one end of the elastic component.

[0041] It should be noted that, in order to ensure that the gas can be discharged from the battery cell when the pressure relief channel is open, a plurality of exhaust holes may be provided on the first extension body 207, or there may be a gap between the first extension body 207 and the inner wall of the valve body 201. By configuring the first extension body 207 on the outer edge of the valve needle 206, it is possible to achieve abutment with the elastic component and the seal 205, ensuring that when the air pressure is greater than the deformation of the elastic component, the seal component can be driven to move and the elastic component is gradually compressed. When the gas inside the battery cell is gradually discharged, the air pressure drops until it is less than the elastic deformation of the elastic component, and the elastic component needs to return to its original state, thereby driving the seal component to move close to the pressure relief channel, thereby sealing the pressure relief channel, achieving good sealing performance, isolating the external gas and moisture, preventing the internal electrolyte from leaking, and maintaining the normal use environment inside the battery cell.

[0042] In some embodiments, the elastic component includes an elastic member 203 and an abutting member 204, the elastic member 203 includes but is not limited to a pressure spring, the abutting member 204 includes but is not limited to a valve cover, the abutting member 204 is provided with a through hole along the second direction, one end of the elastic member 203 abuts against the valve needle 206, and the other end thereof abuts against the abutting member 204, and the abutting member 204 is connected to the valve body 201. By abutting the elastic member 203 against the abutting member 204 and the valve needle 206 respectively, the valve needle 206 can be better regulated by the elastic member 203, timely exhaust can be achieved, and the air pressure inside the battery cell can be maintained stable, thereby better controlling the expansion force of the battery cell itself, and the elastic member 203 can also act on the valve needle 206 after the gas escapes to restore the sealing of the pressure relief channel.

[0043] In some embodiments, the valve body 201 is provided with a receiving cavity and a pressure relief hole 208 along the second direction, the pressure relief hole 208 is communicated with the receiving cavity to form the pressure relief channel, the receiving cavity is configured to receive a part of the structure of the sealing component and the elastic component, and the pressure relief hole 208 is configured to receive a part of the structure of the sealing component. By configuring a part of the structure of the sealing component in the pressure relief hole 208, when the air pressure is insufficient to drive the sealing component to move, the sealing component can better contact the pressure relief hole 208, thereby ensuring the sealing of the valve body 201, isolating the external gas and moisture, preventing the internal electrolyte from leaking, and maintaining the normal use environment inside the battery cell.

[0044] In some embodiments, the outer edge of the valve body 201 is provided with a second extension body 202, and the second extension body 202 is connected to the top cover structure 100, wherein the connection method between the second extension body 202 and the top cover structure 100 includes but is not limited to welding, and the second extension body 202 and the valve body 201 can be integrally formed or connected in other ways. By configuring the second extension body 202 on the outer edge of the valve body 201, the connection between the valve body 201 and the top cover structure 100 can be facilitated, and the stability of the connection between the valve body 201 and the top cover structure 100 can be improved.

[0045] In some embodiments, the top cover structure 100 includes a top cover substrate 101 and a top cover insulating member 102, and the top cover insulating member 102 includes but is not limited to plastic, and can be used to ensure the insulation between the top cover substrate 101 and the pole ear of the battery cell. The top cover insulating member 102 is connected to the top cover substrate, and the mounting hole passes through the top cover insulating member 102 and the top cover substrate 101 in sequence, and when the pressure relief channel is connected, the air pressure flows from the side of the top cover insulating member 102 away from the top cover substrate 101 to the outside of the top cover substrate 101.

[0046] In some embodiments, the battery cell further includes a pole 300, the pole 300 is connected to the side of the top cover substrate 101 away from the top cover insulating member 102, and the pole 300 is configured to form a positive electrode or a negative electrode. By configuring the pole 300 on the top cover, it is beneficial to the subsequent series and parallel connection between battery cells, and it is convenient to assemble the battery cells into the shell, thereby improving the assembly efficiency of the battery pack.

[0047] like Figure 1-Figure 2 As shown, the battery cell further includes an explosion-proof valve 400 , and the explosion-proof valve 400 is connected to the top cover structure 100 , wherein the explosion-proof valve 400 and the one-way structure 200 are spaced apart from each other.

[0048] In the second aspect, the present application also provides a battery pack, including the battery cells as described above, and the battery pack may also include a number of battery cells or battery modules. In the battery module, there may be multiple battery cells, and the multiple battery cells may be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells are both connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel, or in a mixed connection, and then the planar structure of the multiple battery cells is bonded to the water cooling plate; of course, the battery cells may also be in the form of multiple battery cells connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a battery pack. The battery module may also include other structures. For example, the battery module may also include a confluence component for realizing electrical connection between multiple battery cells. Since the battery pack provided in the embodiment of the second aspect of the present application includes the battery cells described in the technical solution of the first aspect, it has all the technical effects of the above-mentioned embodiments, which will not be repeated here.

[0049] In the third aspect, the present application also provides an electrical device, including the battery pack as described above. The electrical device may be a vehicle, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices. Taking a vehicle as an example, the vehicle may also include a controller and a motor, and the controller is used to control the power battery to power the motor, for example, for the starting, navigation, and working power requirements of the vehicle during driving. Because the electrical device provided in the embodiment of the third aspect of the present application includes the battery pack described in the technical solution of the second aspect, it has all the technical effects of the above-mentioned embodiments, which will not be repeated here.

[0050] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For technical users in the field, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A top cover structure is arranged to be distributed along a first direction, and the top cover structure is provided with mounting holes penetrating along a second direction, wherein the first direction is perpendicular to the second direction; A one-way structure includes a valve body, an elastic component and a sealing component, wherein the valve body is connected to the mounting hole, and the valve body is provided with a pressure relief channel along the second direction. The elastic component and the sealing component are both arranged in the pressure relief channel, and the elastic component abuts against the sealing component so that when the air pressure is greater than the deformation of the elastic component along the second direction, the sealing component is pushed to move along the second direction until the pressure relief channel is connected, and when the air pressure is not greater than the deformation of the elastic component along the second direction, the sealing component seals the pressure relief channel.

2. The battery cell according to claim 1, characterized in that: The sealing component comprises a valve needle and a sealing member. The sealing member is sleeved on the valve needle, and the sealing member is located on a side of the valve needle away from the elastic component.

3. The battery cell according to claim 2, characterized in that: The outer edge of the valve needle is provided with a first extension body, and the first extension body is configured to abut against one end of the elastic component.

4. The battery cell according to claim 2, characterized in that: The elastic component includes an elastic member and a contact member. One end of the elastic member contacts the valve needle, and the other end of the elastic member contacts the contact member. The contact member is connected to the valve body.

5. The battery cell according to claim 2 or 3, characterized in that: The valve body is provided with a accommodating cavity and a pressure relief hole along the second direction, the pressure relief hole is communicated with the accommodating cavity to form the pressure relief channel, the accommodating cavity is configured to accommodate a partial structure of the sealing component and the elastic component, and the pressure relief hole is configured to accommodate a partial structure of the sealing component.

6. The battery cell according to claim 1, characterized in that: The outer edge of the valve body is provided with a second extension body, and the second extension body is connected to the top cover structure.

7. The battery cell according to claim 1, characterized in that: The top cover structure includes a top cover substrate and a top cover insulating member, the top cover insulating member is connected to the top cover substrate, the mounting hole passes through the top cover insulating member and the top cover substrate in sequence, and when the pressure relief channel is connected, the air pressure flows from the side of the top cover insulating member away from the top cover substrate to the outside of the top cover substrate.

8. The battery cell according to claim 7, characterized in that: The battery cell further includes a pole connected to a side of the top cover substrate facing away from the top cover insulating member, and the pole is configured to form a positive electrode or a negative electrode.

9. The battery cell according to claim 1 or 7, characterized in that: The battery cell further includes an explosion-proof valve connected to the top cover structure.

10. A power battery pack, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising the power battery pack as claimed in claim 10.

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