Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery cell includes a case and a first protector. The shell comprises a first end wall and a peripheral wall surrounding the edge of the first end wall, the peripheral wall is provided with a first wall in the first direction and is provided with a second wall in the second direction, the first wall and the second wall are adjacently arranged, the area of the outer surface of the first wall is larger than that of the outer surface of the second wall, and the first direction is perpendicular to the second direction. At least part of the first protection piece wraps the outer surface of the shell, the first protection piece comprises a first area, a second area and a first overlapping area, the first overlapping area is connected with the first area and the second area, the first area wraps the first wall, the second area wraps the second wall, and the first overlapping area is folded in the first area. According to the technical scheme, the reliability of the battery can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. 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 is an important factor in their development.

[0003] In the development of battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The present application provides a battery cell, a battery and an electrical device. The technical solution provided in the present application can improve the reliability of the battery.

[0005] In a first aspect, the present application provides a battery cell, including a shell and a first protective member. The shell includes a first end wall and a peripheral wall surrounding the edge of the first end wall, the peripheral wall has a first wall in a first direction, the peripheral wall has a second wall in a second direction, the first wall and the second wall are arranged adjacent to each other, the area of ​​the outer surface of the first wall is greater than the area of ​​the outer surface of the second wall, and the first direction and the second direction are perpendicular to each other. At least part of the first protective member is covered on the outer surface of the shell, the first protective member includes a first area, a second area and a first overlapping area, the first overlapping area connects the first area and the second area, the first area is covered on the first wall, the second area is covered on the second wall, and the first overlapping area is folded over the first area.

[0006] In the above scheme, in which more layers (for example, five layers) of the first protective parts are overlapped on the second wall with a smaller area, by folding the first overlapping area over the first wall with a larger area, so that the second wall is covered by the corresponding second area, on the one hand, it can improve the problem of water vapor penetrating into the gap between the shell and the first protective part through the gap generated by the overlap of multiple layers of protective parts, causing the external insulation of the battery cell to fail, so that the battery cell has higher reliability, and thus the battery has higher reliability; on the other hand, it reduces the risk that the battery cell protrudes too much in the second direction due to the overlap of multiple layers of protective parts on the second wall with a smaller area, resulting in reduced space utilization of the battery cell and thus affecting the volume energy density.

[0007] According to some embodiments of the present application, a size of the first area in the third direction is equal to a size of the second area in the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0008] In the above solution, by limiting the sizes of the first area and the second area in the third direction to be the same, the sizes of the first wall and the second wall protected by the first protective member in the third direction can be consistent, which is beneficial to the consistency of the battery cells and makes the battery have higher reliability.

[0009] According to some embodiments of the present application, the first overlapping area includes a first sub-overlapping area and a second sub-overlapping area, one end of the first sub-overlapping area is connected to the first area, one end of the second sub-overlapping area is connected to the second area, and the other end of the first sub-overlapping area and the other end of the second sub-overlapping area are connected to each other; along the thickness direction of the first wall, the first sub-overlapping area is overlapped with the first area, and the second sub-overlapping area is overlapped with the first sub-overlapping area.

[0010] In the above scheme, the first area and the second area can be effectively connected by stacking and connecting the first sub-overlapping area and the second sub-overlapping area, thereby effectively covering the first wall and the second wall of the shell, reducing the risk of water vapor penetration, making the battery cell have better external insulation effect, improving the reliability of the battery cell, and making the battery have higher reliability.

[0011] According to some embodiments of the present application, a surface of the first sub-overlapping region facing away from the second sub-overlapping region is bonded to the first region; and / or the first sub-overlapping region and the second sub-overlapping region are bonded to each other.

[0012] In the above scheme, the first sub-overlapping area is bonded to the surface of the first area, so that the first overlapping area can be stably folded and fixed to the surface of the first area, reducing the risk of the first overlapping area bulging outward, so that the battery cell has a neat appearance, improving the assembly efficiency of the battery cell, and facilitating the improvement of the volume energy density of the battery. At the same time, in some embodiments, the first sub-overlapping area and the second sub-overlapping area are connected by bonding, which can reduce the risk of the second sub-overlapping area and the first sub-overlapping area being separated from each other and generating a gap to cause water vapor to penetrate, so that the battery cell has a higher reliability, and the battery has a higher reliability.

[0013] According to some embodiments of the present application, the peripheral wall further comprises a third wall in the first direction, the third wall and the first wall are arranged opposite to each other, and the area of ​​the outer surface of the third wall is greater than the area of ​​the outer surface of the second wall. The first protective member further comprises a third area and a second overlapping area, the second overlapping area connects the second area and the third area, the third area is covered by the third wall, and the second overlapping area is folded over the third area.

[0014] In the above solution, by folding the second overlapping area onto the third wall with a larger area, the second overlapping area and the first overlapping area are made symmetrical to each other, thereby reducing the risk of local bulge of the battery cell affecting the volume energy density of the battery, so that the battery has a higher volume energy density.

[0015] According to some embodiments of the present application, along the third direction, the sizes of the first area, the second area, and the third area are all the same, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0016] In the above scheme, by limiting the sizes of the first area, the second area and the third area in the third direction to be the same, the sizes of the first wall, the second wall and the third wall protected by the first protective member in the third direction can be consistent, which is beneficial to the consistency of the battery cells and makes the battery have higher reliability.

[0017] According to some embodiments of the present application, the second overlapping area includes a third sub-overlapping area and a fourth sub-overlapping area, one end of the third sub-overlapping area is connected to the third area, one end of the fourth sub-overlapping area is connected to the second area, and the other end of the third sub-overlapping area and the other end of the fourth sub-overlapping area are connected to each other; along the thickness direction of the third wall, the third sub-overlapping area is overlapped with the third area, and the fourth sub-overlapping area is overlapped with the third sub-overlapping area.

[0018] In the above scheme, by arranging the third sub-overlapping area and the fourth sub-overlapping area which are stacked and connected to each other, the third area and the second area can be effectively connected, thereby effectively covering the third wall and the second wall of the shell, reducing the risk of water vapor infiltration, making the battery cell have better external insulation effect, improving the reliability of the battery cell, and thus providing the reliability of the battery.

[0019] According to some embodiments of the present application, a surface of the third sub-overlapping region facing away from the fourth sub-overlapping region is bonded to the third region; and / or the third sub-overlapping region and the fourth sub-overlapping region are bonded to each other.

[0020] In the above scheme, by bonding the third sub-overlapping area to the surface of the third area, the second overlapping area can be stably folded and fixed to the surface of the third area, reducing the risk of the second overlapping area bulging outward, so that the battery cell has a neat appearance, improving the assembly efficiency of the battery cell, and facilitating the improvement of the volume energy density of the battery. At the same time, in some embodiments, the third sub-overlapping area and the fourth sub-overlapping area are connected by bonding, which can reduce the risk of the third sub-overlapping area and the fourth sub-overlapping area being separated from each other and generating a gap to cause moisture penetration, so that the battery cell has a higher reliability, thereby improving the reliability of the battery.

[0021] According to some embodiments of the present application, the peripheral wall further has a fourth wall in the second direction, and the fourth wall is arranged opposite to the second wall. The first protective member further includes a fourth area, a third overlapping area and a fourth overlapping area, the third overlapping area connects the first area and the fourth area, the fourth overlapping area connects the third area and the fourth area, the fourth area is covered by the fourth wall, the third overlapping area is folded on the first area, and the fourth overlapping area is folded on the third area.

[0022] In the above scheme, by folding the third overlapping area onto the first wall with a larger area, and folding the fourth overlapping area onto the third wall with a larger area, on the one hand, it can reduce the risk that the multiple layers of first protective parts are overlapped on the fourth wall with a smaller area, causing the battery cell to protrude too much in the second direction, resulting in reduced space utilization of the battery cell, thereby affecting the volume energy density; on the other hand, because the fourth wall can be covered by the corresponding fourth area, it can improve the problem of moisture penetrating from the overlapping parts of the multiple layers of first protective parts to contact the shell, causing the external insulation of the battery cell to fail, so that the battery cell has higher reliability, thereby improving the reliability of the battery.

[0023] According to some embodiments of the present application, an adhesive layer is provided between the first protective member and the outer surface of the shell.

[0024] In the above scheme, by providing a glue layer between the first protective member and the outer surface of the shell, the connection stability between the first protective member and the shell can be improved, and the risk of the first protective member detaching from the shell can be reduced, so that the battery cell has higher reliability, and thus the battery has higher reliability.

[0025] According to some embodiments of the present application, the battery cell also includes a cover body and an electrode terminal. Along the third direction, the cover body is arranged opposite to the first end wall, the cover body closes the opening of the shell, and the electrode terminal is arranged on the cover body. The first direction, the second direction and the third direction are perpendicular to each other.

[0026] In the above scheme, by setting the electrode terminal on the cover, the space on the side of the battery cell can be saved, the space of the battery cell in the third direction can be reasonably utilized, the assembly efficiency between multiple battery cells is improved, and the battery has a higher volume energy density.

[0027] According to some embodiments of the present application, the battery cell further includes a second protective member, and at least a portion of the second protective member is covered on the outer surface of the cover.

[0028] In the above scheme, by providing a second protective member on the cover body, the creepage distance between the electrode terminal and the cover body can be increased, and the risk of overlap between the electrode terminal and the cover body can be reduced, so that the battery cell has higher reliability, and thus the battery has higher reliability.

[0029] According to some embodiments of the present application, the second protective member includes a first portion and a second portion that are connected to each other, the first portion is coated on the outer surface of the cover body, and the second portion is disposed around the peripheral wall.

[0030] In the above scheme, the first part can effectively wrap the cover to improve the insulation of the cover, so that the battery cell has a higher reliability. The second part is arranged around the peripheral wall, so that the second protective part can be effectively connected to the shell and the cover, reducing the risk of the second protective part detaching from the cover, so that the battery cell has a higher reliability, and then the battery has a higher reliability.

[0031] According to some embodiments of the present application, along the third direction, the first protective member protrudes from the cover body, and the portion of the first protective member protruding from the cover body is folded over the cover body. The portion of the first protective member protruding from the cover body is located between the cover body and the first portion; or, the portion of the first protective member protruding from the cover body is located on the surface of the first portion away from the cover body.

[0032] In the above solution, the portion of the first protective member extending beyond the cover is connected to the second protective member, which can effectively improve the connection stability between the first protective member and the shell, reduce the risk of the first protective member detaching from the shell, and make the battery cell have higher reliability.

[0033] According to some embodiments of the present application, one of the following conditions is met:

[0034] (1) Along the third direction, the end surface of the first protection member away from the first end wall is flush with the surface of the cover body away from the first end wall.

[0035] (2) Along the third direction, the surface of the cover body away from the first end wall exceeds the end surface of the first protective member away from the first end wall.

[0036] (3) Along the third direction, the end surface of the first protective member away from the first end wall is flush with the surface of the first portion away from the cover body.

[0037] In a second aspect, some embodiments of the present application provide a battery, comprising the battery cell provided in the first aspect.

[0038] In a third aspect, the present application further provides an electrical device, the electrical device comprising the battery cell provided in the first aspect, the battery cell being used to provide electrical energy.

[0039] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 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 ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0042] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0043] Figure 3 A schematic diagram of a battery cell in some embodiments of the present application;

[0044] Figure 4-Figure 7 A schematic diagram of a process of folding the first protective member onto the housing in some embodiments of the present application;

[0045] Figure 8 Schematic diagram of a first protective member folded over a cover body in some embodiments of the present application;

[0046] Fig. 9 A schematic diagram of a battery cell provided with a second protective member in some embodiments of the present application;

[0047] Fig.10 Schematic diagram of battery cells in other embodiments of the present application;

[0048] Fig.11 Schematic diagram of battery cells in other embodiments of the present application.

[0049] Icons: 10-battery cell; 10a-housing; 11-housing; 110-first end wall; 111-first wall; 112-second wall; 113-third wall; 114-fourth wall; 12-cover; 13-electrode terminal; 14-first protective member; 140-first area; 141-second area; 142-third area; 143-fourth area; 144-first overlapping area; 1440-first sub-overlapping area; 1441-second sub-overlapping area; 1 45-second overlapping area; 1450-third sub-overlapping area; 1451-fourth sub-overlapping area; 146-third overlapping area; 147-fourth overlapping area; 15-second protective member; 150-first part; 151-second part; 20-box; 21-first sub-box; 22-second sub-box; 100-battery; x-first direction; y-second direction; z-third direction; 1000-vehicle; 200-controller; 300-motor. DETAILED DESCRIPTION

[0050] 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, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0052] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0055] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0056] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0057] In some embodiments, the battery may include a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0058] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0059] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0060] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0061] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0062] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate the electrode assembly and the electrolyte and other components. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film. The housing may include a shell and a cover, the shell being formed with an opening, and the cover being connected to the shell to close the opening, so that the electrode assembly is located in a closed space.

[0063] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through an adapter.

[0064] In some embodiments, the battery cell may be a square battery cell, that is, the housing may be a square housing. In some embodiments, the surface of the housing is wrapped with a first protective member, and the first protective member plays a protective role, including but not limited to insulation protection, waterproof protection, or anti-scratch protection. Currently, the first protective member is wrapped around the housing by folding.

[0065] The development of battery technology must take into account many design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0066] At present, the first protective member is covered on the shell surface in a folded manner, and a portion where multiple layers of first protective members (for example, five layers of first protective members) overlap each other is formed on the side wall of the shell with a smaller area. The side wall with a smaller area is covered together by the multiple layers of first protective members overlapping each other. However, gaps will be generated in the overlapping portions, which can easily cause water vapor to penetrate through the gaps and contact with the shell, causing the external insulation of the battery cell to fail, affecting the reliability of the battery.

[0067] In view of this, in order to solve the problem that gaps are generated due to overlapping of multiple layers of first protective members, which affects the reliability of the battery, some embodiments of the present application provide a battery cell, including a shell and a first protective member. The shell includes a first end wall and a peripheral wall surrounding the edge of the first end wall, the peripheral wall has a first wall in the first direction, the peripheral wall has a second wall in the second direction, the first wall and the second wall are arranged adjacent to each other, the area of ​​the outer surface of the first wall is greater than the area of ​​the outer surface of the second wall, and the first direction and the second direction are perpendicular to each other. At least part of the first protective member is coated on the outer surface of the shell, the first protective member includes a first area, a second area and a first overlapping area, the first overlapping area connects the first area and the second area, the first area is coated on the first wall, the second area is coated on the second wall, and the first overlapping area is folded over the first area.

[0068] In the above scheme, in which more layers (for example, five layers) of the first protective parts are overlapped on the second wall with a smaller area, by folding the first overlapping area over the first wall with a larger area, so that the second wall is covered by the corresponding second area, on the one hand, it can improve the problem of water vapor penetrating into the gap between the shell and the first protective part through the gap generated by the overlap of multiple layers of protective parts, causing the external insulation of the battery cell to fail, so that the battery cell has higher reliability, and thus the battery has higher reliability; on the other hand, it reduces the risk that the battery cell protrudes too much in the second direction due to the overlap of multiple layers of protective parts on the second wall with a smaller area, resulting in reduced space utilization of the battery cell and thus affecting the volume energy density.

[0069] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device.

[0070] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0071] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0072] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1000 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, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0073] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0074] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a case 20 and a battery cell 10, and the battery cell 10 is contained in the case 20. The case 20 is used to provide a storage space for the battery cell 10, and the case 20 can adopt a variety of structures. In some embodiments, the case 20 may include a first sub-case 21 and a second sub-case 22, and the first sub-case 21 and the second sub-case 22 cover each other, and the first sub-case 21 and the second sub-case 22 jointly define a storage space for accommodating the battery cell 10. The second sub-case 22 may be a hollow structure with one end open, and the first sub-case 21 may be a plate-like structure, and the first sub-case 21 covers the open side of the second sub-case 22, so that the first sub-case 21 and the second sub-case 22 jointly define a storage space; the first sub-case 21 and the second sub-case 22 may also be hollow structures with one side open, and the open side of the first sub-case 21 covers the open side of the second sub-case 22.

[0076] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 20; of course, the battery 100 may also be a battery 100 module formed by connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 20. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 10.

[0077] According to some embodiments of the present application, a battery cell 10 is provided, see 3- Figure 7 , Figure 3 This is a schematic diagram of a battery cell 10 in some embodiments of the present application. Figure 4-Figure 7 Schematic diagram of the process of folding the first protection member 14 onto the housing 11 in some embodiments of the present application.

[0078] The battery cell 10 includes a shell 11 and a first protective member 14. The shell 11 includes a first end wall 110 and a peripheral wall surrounding the edge of the first end wall 110. The peripheral wall has a first wall 111 in a first direction x, and a second wall 112 in a second direction y. The first wall 111 and the second wall 112 are arranged adjacent to each other. The area of ​​the outer surface of the first wall 111 is greater than the area of ​​the outer surface of the second wall 112. The first direction x and the second direction y are perpendicular to each other. At least part of the first protective member 14 is covered on the outer surface of the shell 11. The first protective member 14 includes a first area 140, a second area 141 and a first overlapping area 144. The first overlapping area 144 connects the first area 140 and the second area 141. The first area 140 is covered on the first wall 111, the second area 141 is covered on the second wall 112, and the first overlapping area 144 is folded over the first area 140.

[0079] In some embodiments, the battery cell 10 includes a shell 10a and an electrode assembly, and the electrode assembly is disposed in the shell 10a. The material of the shell 10a can be aluminum, aluminum alloy, steel, etc. The shell 10a may include a shell 11 and a cover 12, the shell 11 has an opening, and the cover 12 is connected to the shell 10a and closes the opening, so that the electrode assembly is located in a closed space. The connection relationship between the cover 12 and the shell 10a includes but is not limited to bonding, welding, riveting, screw connection or other connection methods. In some embodiments, the shell 10a may be provided with an electrode terminal 13, for example, the cover 12 is provided with an electrode terminal 13, and the electrode terminal 13 is connected to the pole ear of the electrode assembly to achieve the output or input of electrical energy.

[0080] The housing 11 may be a square housing. In some embodiments, see Figure 4 The shell 11 includes a first end wall 110 and a peripheral wall surrounding the edge of the first end wall 110 .

[0081] The peripheral wall may include a first wall 111, a second wall 112, a third wall 113 and a fourth wall 114. The first wall 111 and the third wall 113 are arranged opposite to each other in the first direction x, and the second wall 112 and the fourth wall 114 are arranged opposite to each other in the second direction y. The first end wall 110 and the cover body 12 may be arranged opposite to each other in the third direction z. Along the circumference of the shell 11, the first wall 111, the second wall 112, the third wall 113 and the fourth wall 114 are connected in sequence. The first direction x, the second direction y and the third direction z are perpendicular to each other. In some embodiments, the first direction x may be the thickness direction of the shell 11, the second direction y may be the width direction of the shell 11, and the third direction z may be the height direction of the shell 11. In some embodiments, the area of ​​the outer surface of the first wall 111 is equal to the area of ​​the outer surface of the third wall 113, the area of ​​the outer surface of the second wall 112 is equal to the area of ​​the outer surface of the fourth wall 114, and the area of ​​the outer surface of the first wall 111 is greater than the area of ​​the outer surface of the second wall 112.

[0082] The first protective member 14 is a member for covering the outer surface of the housing 11, and the first protective member 14 plays a protective role. In some embodiments, the first protective member 14 can be made of a material having insulating properties. In some embodiments, the first protective member 14 can play the role of insulation, waterproofing and scratch resistance. In some embodiments, the first protective member 14 can be in the form of a film or a sheet. Exemplarily, the first protective member 14 can be a blue film.

[0083] In some embodiments, an adhesive layer may be provided on all or part of the inner side of the first protective member 14. When the first protective member 14 is covered on the outer surface of the shell 11, a stable connection relationship can be formed between the first protective member 14 and the shell 11 through the adhesive layer. The adhesive layer may be a pressure-sensitive adhesive, UV adhesive or other sticky substances.

[0084] In some embodiments, see Figure 4 When the first protective member 14 is not covered on the outer surface of the shell 11, or in other words, when the first protective member 14 is removed and unfolded, the first protective member 14 can be a square flat paper-like member.

[0085] “At least part of the first protective member 14 is covered on the outer surface of the shell 11” can be understood as the first protective member 14 is completely covered on the outer surface of the shell 11; or part of the first protective member 14 is covered on the outer surface of the shell 11, and the other part is covered on the cover 12. “The first protective member 14 is completely covered on the outer surface of the shell 11” can be understood as the outer surface of the shell 11 is completely covered by the first protective member 14, or part of the outer surface of the shell 11 is covered by the first protective member 14.

[0086] In some embodiments, see Figure 4-Figure 7 The first protection member 14 can be folded along the edge of the shell 11 on the outer surface of the shell 11. The first area 140 and the second area 141 are the first protection member 14 folded along the edge of the shell 11 on different wall portions of the shell 11, and the first overlapping area 144 is a multi-layer (for example, two-layer) structure formed by the first protection member 14 being turned along the edge of the shell 11.

[0087] For example, Figure 4 As shown, the housing 11 is placed on the first protective member 14 in the unfolded state, and the first end wall 110 of the housing 11 is in contact with the protective member; then, Figure 5 As shown, the first protection member 14 is folded toward the first wall 111 along the edge between the first end wall 110 and the first wall 111, and the first area 140 covers the first wall 111. Figure 6 As shown, the first protection member 14 is folded toward the second wall 112 along the edge between the first end wall 110 and the second wall 112 to form a second area 141 wrapped around the second wall 112 and a first overlapping area 144 connecting the first area 140 and the second area 141. Figure 7 As shown, the first overlapping area 144 is folded toward the first wall 111 along the edge between the first wall 111 and the second wall 112 , and overlaps the first area 140 .

[0088] In some embodiments, "the area of ​​the outer surface of the first wall 111 is greater than the area of ​​the outer surface of the second wall 112" can be understood as that the first wall 111 and the second wall 112 have the same size in the third direction z, that is, the height of the outer surface of the first wall 111 is equal to the height of the second wall 112, and the width dimension of the outer surface of the first wall 111 (the dimension of the first wall 111 in the second direction y) is greater than the width dimension of the second wall 112 (the dimension of the second wall 112 in the first direction x).

[0089] In the above scheme, in the case where more layers (for example, five layers) of the first protective member 14 are overlapped on the second wall 112 with a smaller area, by folding the first overlapping area 144 over the first wall 111 with a larger area, the second wall 112 is covered by the corresponding second area 141. On the one hand, it can improve the problem of water vapor penetrating into the gap between the shell 11 and the first protective member 14 through the gap generated by the overlap of multiple layers of first protective members 14, causing the external insulation of the battery cell 10 to fail, so that the battery cell 10 has higher reliability, and thus the battery 100 has higher reliability; on the other hand, it reduces the risk that the battery cell 10 protrudes too much in the second direction y due to the overlap of multiple layers of protective members on the second wall 112 with a smaller area, resulting in a reduction in the space utilization of the battery cell 10 and thus affecting the volume energy density.

[0090] According to some embodiments of this application, see Figure 6 , the size of the first area 140 in the third direction z is equal to the size of the second area 141 in the third direction z, and the first direction x, the second direction y and the third direction z are perpendicular to each other.

[0091] In some embodiments, the third direction z may be the height direction of the battery cell 10. In some scenarios, the first end wall 110 is the lowest part of the battery cell 10 in the direction of gravity. Part of the first protective member 14 is coated on the outer surface of the first end wall 110 and folded on the peripheral wall of the shell 11 along the edge of the shell 11. "The size of the first area 140 in the third direction z is equal to the size of the second area 141 in the third direction z" can be understood as, in the third direction z, the height positions of the first wall 111 and the second wall 112 coated by the first protective member 14 are the same, and the height dimensions of the first overlapping area 144, the first area 140 and the second area 141 are the same. The protective effects of the first area 140 and the second area 141 against the infiltration of water vapor can be relatively consistent.

[0092] Exemplarily, in some embodiments, the size of the first area 140 in the third direction z is equal to the size of the first wall 111 in the third direction z, and the size of the second area 141 in the third direction z is equal to the size of the second wall 112 in the third direction z. Again exemplarily, in some embodiments, the first area 140 exceeds the first wall 111 in the third direction z, the second area 141 exceeds the second wall 112 in the third direction z, and the size of the first area 140 exceeding the first wall 111 in the third direction z is equal to the size of the second area 141 exceeding the second wall 112 in the third direction z. Again exemplarily, in some embodiments, the first wall 111 exceeds the first area 140 in the third direction z, the second wall 112 exceeds the second area 141 in the third direction z, and the size of the first wall 111 exceeding the first area 140 in the third direction z is equal to the size of the second wall 112 exceeding the second area 141 in the third direction z.

[0093] In the above scheme, by limiting the sizes of the first area 140 and the second area 141 in the third direction z to be the same, the sizes of the first wall 111 and the second wall 112 protected by the first protective member 14 in the third direction z can be consistent, which is beneficial to the consistency of the battery cell 10 and makes the battery 100 have higher reliability.

[0094] In some other embodiments, the size of the first region 140 in the third direction z may not be equal to the size of the second region 141 in the third direction z. For example, the size of the second region 141 in the third direction z is smaller than the size of the first region 140 in the third direction z.

[0095] According to some embodiments of this application, see Figure 6 The first overlapping area 144 includes a first sub-overlapping area 1440 and a second sub-overlapping area 1441, one end of the first sub-overlapping area 1440 is connected to the first area 140, one end of the second sub-overlapping area 1441 is connected to the second area 141, and the other end of the first sub-overlapping area 1440 and the other end of the second sub-overlapping area 1441 are connected to each other; along the thickness direction of the first wall 111, the first sub-overlapping area 1440 is overlapped with the first area 140, and the second sub-overlapping area 1441 is overlapped with the first sub-overlapping area 1440.

[0096] The first overlapping region 144 may be a multi-layer structure. For example, the first overlapping region 144 includes a first sub-overlapping region 1440 and a second sub-overlapping region 1441 that are overlapped with each other. Figure 6 As shown, the first overlapping area 144 is triangular, and is formed by overlapping a triangular first sub-overlapping area 1440 and a triangular second sub-overlapping area 1441. In some embodiments, the first sub-overlapping area 1440 is a right triangle, and the second sub-overlapping area 1441 is a right triangle.

[0097] One end of the first sub-overlapping area 1440 away from the second sub-overlapping area 1441 can be regarded as a right-angled side, which is connected to the first area 140 and can be arranged corresponding to the edges of the first wall 111 and the second wall 112. The other end of the first sub-overlapping area 1440 can be regarded as a hypotenuse, which is connected to the second sub-overlapping area 1441. One end of the second sub-overlapping area 1441 away from the first sub-overlapping area 1440 can be regarded as a right-angled side, which is connected to the second area 141 and can be arranged corresponding to the edges of the first wall 111 and the second wall 112. The other end of the second sub-overlapping area 1441 can be regarded as a hypotenuse, which is connected to the hypotenuse of the first sub-overlapping area 1440.

[0098] In the above scheme, the first area 140 and the second area 141 can be effectively connected by stacking and connecting the first sub-overlapping area 1440 and the second sub-overlapping area 1441, thereby effectively covering the first wall 111 and the second wall 112 of the shell 11, reducing the risk of water vapor penetration, so that the battery cell 10 has a better external insulation effect, improving the reliability of the battery cell 10, and making the battery 100 have higher reliability.

[0099] According to some embodiments of the present application, a surface of the first sub-overlapping region 1440 that is away from the second sub-overlapping region 1441 is bonded to the first region 140 ; ​​and / or the first sub-overlapping region 1440 and the second sub-overlapping region 1441 are bonded to each other.

[0100] In some embodiments, the first overlapping area 144 is folded over the first area 140, and the first sub-overlapping area 1440 can be connected to the first area 140 by bonding. An adhesive layer can be provided between the first sub-overlapping area 1440 and the first area 140, and the adhesive layer can be a pressure-sensitive adhesive, UV adhesive or other adhesive substances.

[0101] In some embodiments, before or after the first overlapping region 144 is folded over the first region 140, the first sub-overlapping region 1440 and the second sub-overlapping region 1441 are connected to each other by bonding. Figure 6 As shown, the first protective member 14 is folded toward the second wall 112 along the edge between the first end wall 110 and the second wall 112 to form the second area 141 covering the second wall 112 and the first overlapping area 144 connecting the first area 140 and the second area 141. In the process, an adhesive layer is provided between the first sub-overlapping area 1440 and the second sub-overlapping area 1441 to bond the two. The adhesive layer can be a pressure-sensitive adhesive, a UV adhesive or other adhesive substances.

[0102] In some embodiments, the entire or part of the inner layer of the first protective member 14 may be provided with an adhesive layer, that is, when the first protective member 14 is not folded and covered on the shell 11, the adhesive layer is provided on the inner side of the first protective member 14, and then the first protective member 14 is folded. Figure 6 As shown, the first protective member 14 is folded toward the second wall 112 along the edge between the first end wall 110 and the second wall 112 to form a second area 141 wrapped around the second wall 112 and a first sub-overlapping area 1440 and a second sub-overlapping area 1441 bonded to each other.

[0103] In the above solution, the first sub-overlapping area 1440 is bonded to the surface of the first area 140, so that the first overlapping area 144 can be stably folded and fixed to the surface of the first area 140, reducing the risk of the first overlapping area 144 bulging outward, so that the battery cell 10 has a neat appearance, improving the assembly efficiency of the battery cell 10, and facilitating the improvement of the volume energy density of the battery 100. At the same time, in some embodiments, the first sub-overlapping area 1440 and the second sub-overlapping area 1441 are connected by bonding, which can reduce the risk of the second sub-overlapping area 1441 and the first sub-overlapping area 1440 being separated from each other and generating a gap to cause water vapor penetration, so that the battery cell 10 has a higher reliability, and the battery 100 has a higher reliability.

[0104] According to some embodiments of the present application, the peripheral wall further has a third wall 113 in the first direction x, the third wall 113 and the first wall 111 are arranged opposite to each other, and the area of ​​the outer surface of the third wall 113 is greater than the area of ​​the outer surface of the second wall 112. The first protective member 14 further includes a third area 142 and a second overlapping area 145, the second overlapping area 145 connects the second area 141 and the third area 142, the third area 142 is covered by the third wall 113, and the second overlapping area 145 is folded over the third area 142.

[0105] In the first direction x, the third wall 113 and the first wall 111 are disposed opposite to each other. The second wall 112 connects the first wall 111 and the third wall 113 .

[0106] The third area 142 and the second overlapping area 145 are formed along the edges of the housing 11 by the first protection member 14. The third area 142 covers the third wall 113. In some embodiments, the third area 142 completely covers the third wall 113. In other embodiments, the third area 142 covers a portion of the third wall 113.

[0107] The second overlapping region 145 is a multi-layer structure, and connects the second region 141 and the third region 142 .

[0108] For example, Figure 4As shown, the housing 11 is placed on the first protective member 14 in the unfolded state, and the first end wall 110 of the housing 11 is in contact with the protective member; then, Figure 5 As shown, the first protection member 14 is folded toward the first wall 111 along the edge between the first end wall 110 and the first wall 111, and the first region 140 covers the first wall 111. The first protection member 14 is folded toward the third wall 113 along the edge between the first end wall 110 and the third wall 113, and the third region 142 covers the third wall 113. Then, Figure 6 As shown, the first protection member 14 is folded toward the second wall 112 along the edge between the first end wall 110 and the second wall 112 to form a second area 141 wrapped around the second wall 112, a first overlapping area 144 connecting the first area 140 and the second area 141, and a second overlapping area 145 connecting the third area 142 and the second area 141. Figure 7 As shown, the first overlapping area 144 is folded toward the first wall 111 along the edge between the first wall 111 and the second wall 112 . Overlapping the first area 140 , the second overlapping area 145 is folded toward the third wall 113 along the edge between the second wall 112 and the third wall 113 , and overlapped with the third area 142 .

[0109] In the above solution, by folding the second overlapping area 145 onto the third wall 113 with a larger area, the second overlapping area 145 and the first overlapping area 144 are made symmetrical with each other, thereby reducing the risk of local bulging of the battery cell 10 and affecting the volume energy density of the battery 100, so that the battery 100 has a higher volume energy density.

[0110] In some other embodiments, the second overlapping region 145 may also be folded along the edges of the second wall 112 and the third wall 113 in a direction away from the third wall 113 to overlap the second region 141 and the first overlapping region 144 .

[0111] According to some embodiments of the present application, along the third direction z, the sizes of the first area 140 , the second area 141 and the third area 142 are the same, and the first direction x, the second direction y and the third direction z are perpendicular to each other.

[0112] In some embodiments, the third direction z may be the height direction of the battery cell 10. In some scenarios, the first end wall 110 is the lowest part of the battery cell 10 in the direction of gravity. Part of the first protective member 14 is coated on the outer surface of the first end wall 110 and folded on the peripheral wall of the shell 11 along the edge of the shell 11. "Along the third direction z, the first area 140, the second area 141 and the third area 142 are all the same size" can be understood as, in the third direction z, the height positions of the first wall 111, the second wall 112 and the third wall 113 coated by the first protective member 14 are the same, and the height dimensions of the first overlapping area 144, the first area 140, the second area 141, the third area 142 and the second overlapping area 145 are the same. The first area 140, the second area 141 and the third area 142 can have a relatively consistent protective effect against the infiltration of water vapor.

[0113] Exemplarily, in some embodiments, the size of the first area 140 in the third direction z is equal to the size of the first wall 111 in the third direction z, the size of the second area 141 in the third direction z is equal to the size of the second wall 112 in the third direction z, and the size of the third area 142 in the third direction z is equal to the size of the third wall 113 in the third direction z. Again exemplarily, in some embodiments, the first area 140 exceeds the first wall 111 in the third direction z, the second area 141 exceeds the second wall 112 in the third direction z, and the third area 142 exceeds the third wall 113 in the third direction z, and the size of the first area 140 exceeding the first wall 111 in the third direction z is equal to the size of the second area 141 exceeding the second wall 112 in the third direction z, and equal to the size of the third area 142 exceeding the third wall 113 in the third direction z. Again exemplarily, in some embodiments, the first wall 111 extends beyond the first zone 140 in the third direction z, the second wall 112 extends beyond the second zone 141 in the third direction z, and the third wall 113 extends beyond the third zone 142 in the third direction z, and the dimension of the first wall 111 extending beyond the first zone 140 in the third direction z is equal to the dimension of the second wall 112 extending beyond the second zone 141 in the third direction z, which is equal to the dimension of the third wall 113 extending beyond the third zone 142 in the third direction z.

[0114] In the above scheme, by limiting the sizes of the first area 140, the second area 141 and the third area 142 in the third direction z to be the same, the sizes of the first wall 111, the second wall 112 and the third wall 113 covered and protected by the first protective member 14 in the third direction z can be consistent, which is beneficial to the consistency of the battery cell 10 and makes the battery 100 have higher reliability.

[0115] According to some embodiments of the present application, the second overlapping area 145 includes a third sub-overlapping area 1450 and a fourth sub-overlapping area 1451, one end of the third sub-overlapping area 1450 is connected to the third area 142, one end of the fourth sub-overlapping area 1451 is connected to the second area 141, and the other end of the third sub-overlapping area 1450 and the other end of the fourth sub-overlapping area 1451 are connected to each other; along the thickness direction of the third wall 113, the third sub-overlapping area 1450 is overlapped with the third area 142, and the fourth sub-overlapping area 1451 is overlapped with the third sub-overlapping area 1450.

[0116] The second overlapping region 145 may be a multi-layer structure. For example, the second overlapping region 145 includes a third sub-overlapping region 1450 and a fourth sub-overlapping region 1451 that are overlapped with each other. Figure 6 As shown, the second overlapping area 145 is triangular, formed by overlapping a triangular third overlapping sub-area 1450 and a triangular fourth overlapping sub-area 1451. In some embodiments, the third overlapping sub-area 1450 is a right triangle, and the fourth overlapping sub-area 1451 is a right triangle.

[0117] One end of the third sub-overlapping area 1450 away from the fourth sub-overlapping area 1451 can be regarded as a right-angled side, which is connected to the third area 142, and the right-angled side can be arranged corresponding to the edge of the third wall 113 and the second wall 112. The other end of the third sub-overlapping area 1450 can be regarded as a hypotenuse, which is connected to the fourth sub-overlapping area 1451. One end of the fourth sub-overlapping area 1451 away from the third sub-overlapping area 1450 can be regarded as a right-angled side, which is connected to the second area 141, and the right-angled side can be arranged corresponding to the edge of the third wall 113 and the second wall 112. The other end of the fourth sub-overlapping area 1451 can be regarded as a hypotenuse, which is connected to the hypotenuse of the third sub-overlapping area 1450.

[0118] In the above scheme, by arranging the third sub-overlapping area 1450 and the fourth sub-overlapping area 1451 which are stacked and connected to each other, the third area 142 and the second area 141 can be effectively connected, thereby effectively covering the third wall 113 and the second wall 112 of the shell 11, reducing the risk of water vapor penetration, so that the battery cell 10 has a better external insulation effect, improving the reliability of the battery cell 10, and further providing the reliability of the battery 100.

[0119] According to some embodiments of the present application, a surface of the third sub-overlapping region 1450 facing away from the fourth sub-overlapping region 1451 is bonded to the third region 142 ; and / or the third sub-overlapping region 1450 and the fourth sub-overlapping region 1451 are bonded to each other.

[0120] In some embodiments, the second overlapping area 145 is folded over the third area 142, and the second sub-overlapping area 1441 can be connected to the third area 142 by bonding. An adhesive layer can be provided between the third sub-overlapping area 1450 and the third area 142, and the adhesive layer can be a pressure-sensitive adhesive, UV adhesive or other adhesive substances.

[0121] In some embodiments, before or after the second overlapping region 145 is folded over the third region 142, the third sub-overlapping region 1450 and the fourth sub-overlapping region 1451 are connected to each other by bonding. Figure 6 As shown, the first protective member 14 is folded toward the second wall 112 along the edge between the first end wall 110 and the second wall 112 to form the second area 141 and the second overlapping area 145 covering the second wall 112, and an adhesive layer is provided between the third sub-overlapping area 1450 and the fourth sub-overlapping area 1451 to bond the two. The adhesive layer can be a pressure-sensitive adhesive, a UV adhesive or other adhesive substances.

[0122] In some embodiments, the entire or part of the inner layer of the first protective member 14 may be provided with an adhesive layer, that is, when the first protective member 14 is not folded and covered on the shell 11, the adhesive layer is provided on the inner side of the first protective member 14, and then the first protective member 14 is folded. Figure 6 As shown, the first protective member 14 is folded toward the second wall 112 along the edge between the first end wall 110 and the second wall 112 to form a second area 141 wrapped around the second wall 112 and a third sub-overlapping area 1450 and a fourth sub-overlapping area 1451 bonded to each other.

[0123] In the above solution, by bonding the third sub-overlapping area 1450 to the surface of the third area 142, the second overlapping area 145 can be stably folded and fixed to the surface of the third area 142, reducing the risk of the second overlapping area 145 protruding, so that the battery cell 10 has a neat appearance, improving the assembly efficiency of the battery cell 10, and facilitating the improvement of the volume energy density of the battery 100. At the same time, in some embodiments, the third sub-overlapping area 1450 and the fourth sub-overlapping area 1451 are connected by bonding, which can reduce the risk of the third sub-overlapping area 1450 and the fourth sub-overlapping area 1451 being separated from each other and generating a gap to cause moisture penetration, so that the battery cell 10 has a higher reliability, thereby improving the reliability of the battery 100.

[0124] According to some embodiments of this application, see Figure 3-Figure 7The peripheral wall also has a fourth wall 114 in the second direction y, and the fourth wall 114 is arranged opposite to the second wall 112. The first protection member 14 also includes a fourth area 143, a third overlapping area 146 and a fourth overlapping area 147, the third overlapping area 146 connects the first area 140 and the fourth area 143, the fourth overlapping area 147 connects the third area 142 and the fourth area 143, the fourth area 143 is covered on the fourth wall 114, the third overlapping area 146 is folded on the first area 140, and the fourth overlapping area 147 is folded on the third area 142.

[0125] In the second direction y, the fourth wall 114 and the second wall 112 are disposed opposite to each other, and the fourth wall 114 connects the first wall 111 and the third wall 113 .

[0126] The fourth area 143, the third overlapping area 146 and the fourth overlapping area 147 are formed along the edges of the first protection member 14. The fourth area 143 covers the fourth wall 114. In some embodiments, the fourth area 143 completely covers the fourth wall 114. In other embodiments, the fourth area 143 covers a portion of the fourth wall 114.

[0127] The third overlapping region 146 is a multi-layer structure, and connects the first region 140 and the fourth region 143. The fourth overlapping region 147 is a multi-layer structure, and connects the third region 142 and the fourth region 143.

[0128] For example, Figure 4 As shown, the housing 11 is placed on the first protective member 14 in the unfolded state, and the first end wall 110 of the housing 11 is in contact with the protective member; then, Figure 5 As shown, the first protection member 14 is folded toward the first wall 111 along the edge between the first end wall 110 and the first wall 111, and the first region 140 covers the first wall 111. The first protection member 14 is folded toward the third wall 113 along the edge between the first end wall 110 and the third wall 113, and the third region 142 covers the third wall 113. Then, Figure 6 As shown, the first protection member 14 is folded toward the second wall 112 along the edge between the first end wall 110 and the second wall 112 to form a second area 141 wrapped around the second wall 112, a first overlapping area 144 connecting the first area 140 and the second area 141, and a second overlapping area 145 connecting the third area 142 and the second area 141. The first protection member 14 is folded toward the fourth wall 114 along the edge between the first end wall 110 and the fourth wall 114 to form a fourth area 143 wrapped around the fourth wall 114, a third overlapping area 146 connecting the first area 140 and the fourth area 143, and a fourth overlapping area 147 connecting the third area 142 and the fourth area 143.

[0129] Then, Figure 7As shown, the first overlapping area 144 is folded toward the first wall 111 along the edge between the first wall 111 and the second wall 112, and overlaps the first area 140. The second overlapping area 145 is folded toward the third wall 113 along the edge between the second wall 112 and the third wall 113, and overlaps the third area 142. The third overlapping area 146 is folded toward the first wall 111 along the edge between the first wall 111 and the fourth wall 114, and overlaps the first area 140. The fourth overlapping area 147 is folded toward the third wall 113 along the edge between the fourth wall 114 and the third wall 113, and overlaps the third area 142.

[0130] In some embodiments, the first overlapping region 144 and the third overlapping region 146 overlapping the first region 140 do not interfere with each other. The second overlapping region 145 and the fourth overlapping region 147 overlapping the third region 142 do not interfere with each other.

[0131] In some embodiments, along the third direction z, the sizes of the first area 140 , the second area 141 , the third area 142 and the fourth area 143 are all the same, and the first direction x, the second direction y and the third direction z are perpendicular to each other.

[0132] In some embodiments, the third overlapping region 146 includes a fifth sub-overlapping region and a sixth sub-overlapping region, one end of the fifth sub-overlapping region is connected to the first region 140, one end of the sixth sub-overlapping region is connected to the fourth region 143, and the other end of the fifth sub-overlapping region and the other end of the sixth sub-overlapping region are connected to each other; along the thickness direction of the first wall 111, the fifth sub-overlapping region is overlapped with the first region 140, and the sixth sub-overlapping region is overlapped with the fifth sub-overlapping region. In some embodiments, the surface of the fifth sub-overlapping region that is away from the sixth sub-overlapping region is bonded to the first region 140; and / or, the fifth sub-overlapping region and the sixth sub-overlapping region are bonded to each other.

[0133] In some embodiments, the fourth overlapping region 147 includes a seventh sub-overlapping region and an eighth sub-overlapping region, one end of the seventh sub-overlapping region is connected to the third region 142, one end of the eighth sub-overlapping region is connected to the fourth region 143, and the other end of the seventh sub-overlapping region and the other end of the eighth sub-overlapping region are connected to each other; along the thickness direction of the third wall 113, the seventh sub-overlapping region is overlapped with the third region 142, and the eighth sub-overlapping region is overlapped with the seventh sub-overlapping region. In some embodiments, the surface of the seventh sub-overlapping region that is away from the eighth sub-overlapping region is bonded to the third region 142; and / or the seventh sub-overlapping region and the eighth sub-overlapping region are bonded to each other.

[0134] In the above scheme, by folding the third overlapping area 146 onto the first wall 111 with a larger area, and folding the fourth overlapping area 147 onto the third wall 113 with a larger area, on the one hand, it is possible to reduce the risk that the multiple layers of first protective components 14 are overlapped on the fourth wall 114 with a smaller area, causing the battery cell 10 to protrude too much in the second direction y, resulting in reduced space utilization of the battery cell 10, thereby affecting the volume energy density; on the other hand, because the fourth wall 114 can be covered by the corresponding fourth area 143, it is possible to improve the problem that moisture penetrates from the overlapping parts of the multiple layers of first protective components 14 to contact the shell 11, causing the external insulation of the battery cell 10 to fail, so that the battery cell 10 has higher reliability, thereby improving the reliability of the battery 100.

[0135] According to some embodiments of the present application, an adhesive layer is disposed between the first protective member 14 and the outer surface of the shell 11 .

[0136] The glue layer may be a structural layer having adhesiveness. The glue layer may be an adhesive layer.

[0137] “An adhesive layer is provided between the first protective member 14 and the outer surface of the housing 11” can be understood as that the first protective member 14 is connected to the outer surface of the housing 11 by bonding. In some embodiments, the entire or part of the inner side of the first protective member 14 can be provided with an adhesive layer. When the first protective member 14 is coated on the outer surface of the housing 11, the adhesive layer can form a stable connection between the first protective member 14 and the housing 11. The adhesive layer can be a pressure-sensitive adhesive, a UV adhesive, or other adhesive substances.

[0138] In the above scheme, by providing a glue layer between the first protective member 14 and the outer surface of the shell 11, the connection stability between the first protective member 14 and the shell 11 can be improved, and the risk of the first protective member 14 being separated from the shell 11 can be reduced, so that the battery cell 10 has a higher reliability, and then the battery 100 has a higher reliability.

[0139] According to some embodiments of the present application, Figure 4 The battery cell 10 also includes a cover body 12 and an electrode terminal 13. Along the third direction z, the cover body 12 is arranged opposite to the first end wall 110. The cover body 12 closes the opening of the shell 11. The electrode terminal 13 is arranged on the cover body 12. The first direction x, the second direction y and the third direction z are perpendicular to each other.

[0140] In some embodiments, the battery cell 10 includes a shell 10a, and the electrode assembly of the battery cell 10 is arranged in the shell 10a. The shell 10a may include a cover 12 and a shell 11, and the shell 11 has an opening in the first direction x. The cover 12 may be a square plate-like structure corresponding to the opening, or the cover 12 may be a box-like structure corresponding to the opening of the shell 11. The cover 12 is connected to the shell 11 and closes the opening, so that the electrode assembly is in a closed space. The connection relationship between the cover 12 and the shell 11 includes, but is not limited to, welding, riveting, screw connection and other methods. Exemplarily, the cover 12 is welded to the peripheral wall of the shell 11. In some embodiments, the cover 12 is provided with a liquid injection port. After the cover 12 closes the opening, the electrolyte is injected into the shell 10a through the liquid injection port.

[0141] The electrode terminal 13 may be an electrode lead-out member of the battery cell 10, and is used for input and output of electric energy. In some embodiments, the cover 12 may be provided with the electrode terminal 13, and in some embodiments, the electrode terminal 13 may be convexly provided on the cover 12. The electrode terminal 13 is directly or indirectly connected to the electrode assembly inside the housing 10a, for example, the electrode terminal 13 is welded to the tab of the electrode assembly, and for another example, the electrode terminal 13 is connected to the tab through an adapter.

[0142] In the above scheme, by setting the electrode terminal 13 on the cover 12, the space on the side of the battery cell 10 can be saved, and the space of the battery cell 10 in the third direction z can be reasonably utilized, which is beneficial to the assembly efficiency between multiple battery cells 10, so that the battery 100 has a higher volume energy density.

[0143] In some embodiments, along the third direction z, the first protection member 14 has a portion extending beyond the cover body 12, and the portion extending beyond the cover body 12 can be folded over the cover body 12. For example, see Figure 7 and Figure 8 , Figure 8 This is a schematic diagram of the first protection member 14 being folded over the cover 12 in some embodiments of the present application.

[0144] In the process of folding the first protection member 14, Figure 7 As shown, the first overlapping area 144 is folded toward the first wall 111 along the edge between the first wall 111 and the second wall 112, and overlaps the first area 140. The second overlapping area 145 is folded toward the third wall 113 along the edge between the second wall 112 and the third wall 113, and overlaps the third area 142. The third overlapping area 146 is folded toward the first wall 111 along the edge between the first wall 111 and the fourth wall 114, and overlaps the first area 140. The fourth overlapping area 147 is folded toward the third wall 113 along the edge between the fourth wall 114 and the third wall 113, and overlaps the third area 142. Figure 8As shown, along the third direction z, the first protective member 14 has a portion extending beyond the cover body 12. An operator or mechanical equipment can cut the first protective member 14 located above the cover body 12 along the edge between the first wall 111 and the second wall 112, cut the first protective member 14 located above the cover body 12 along the edge between the third wall 113 and the second wall 112, cut the first protective member 14 located above the cover body 12 along the edge between the first wall 111 and the fourth wall 114, cut the first protective member 14 located above the cover body 12 along the edge between the third wall 113 and the fourth wall 114, and then fold the portion of the first protective member 14 extending beyond the cover body 12 toward the cover body 12.

[0145] According to some embodiments of this application, see Fig. 9 , Fig. 9 Schematic diagram of a battery cell 10 provided with a second protective member 15 in some embodiments of the present application.

[0146] The battery cell 10 further includes a second protection member 15 , at least a portion of which covers the outer surface of the cover 12 .

[0147] The second protective member 15 is a member for covering the outer surface of the cover body 12, and the second protective member 15 plays a protective role. In some embodiments, the second protective member 15 can be made of a material having insulating properties. In some embodiments, the second protective member 15 can play the role of insulation, waterproofing and scratch resistance. In some embodiments, the second protective member 15 can be in the form of a film or a sheet. Exemplarily, the second protective member 15 can be a blue film.

[0148] In some embodiments, the second protective member 15 may be provided with a through hole, through which the electrode terminal 13 passes. In some embodiments, the entire or part of the inner side of the second protective member 15 may be provided with an adhesive layer, and when the second protective member 15 is covered on the outer surface of the cover body 12, the adhesive layer can form a stable connection between the second protective member 15 and the cover body 12, and the adhesive layer may be a pressure-sensitive adhesive, a UV adhesive or other adhesive substances.

[0149] “At least part of the second protective member 15 is covered on the outer surface of the cover body 12” can be understood as that the entire second protective member 15 can cover the outer surface of the cover body 12, or part of the second protective member 15 can cover the outer surface of the cover body 12. Exemplarily, part of the second protective member 15 is covered on the outer surface of the cover body 12, and the other part of the second protective member 15 is located on the peripheral wall of the housing 11.

[0150] In the above scheme, by providing the second protective member 15 on the cover body 12, the creepage distance between the electrode terminal 13 and the cover body 12 can be increased, and the risk of overlap between the electrode terminal 13 and the cover body 12 can be reduced, so that the battery cell 10 has higher reliability, and further the battery 100 has higher reliability.

[0151] According to some embodiments of the present application, the second protective member 15 includes a first portion 150 and a second portion 151 that are connected to each other. The first portion 150 is coated on the outer surface of the cover body 12 , and the second portion 151 is disposed around the peripheral wall.

[0152] The first part 150 is coated on the outer surface of the cover body 12. In some embodiments, the first part 150 may be provided with a through hole for the electrode assembly to pass through. The second part 151 is connected to the first part 150, and the second part 151 is arranged around the peripheral wall.

[0153] In some embodiments, the second protective member 15 is a protective cover, which is placed on the cover body 12 . The portion of the protective cover covering the outer surface of the cover body 12 is the first portion 150 , and the portion of the protective cover surrounding the peripheral wall is the second portion 151 .

[0154] In some embodiments, part of the first protection member 14 is folded over the cover body 12, and the part folded over the cover body 12 may be located between the cover body 12 and the first portion 150, while part of the first protection member 14 is located between the peripheral wall and the second portion 151. Alternatively, part of the first protection member 14 is folded over the cover body 12, the first portion 150 is located between the part folded over the cover body 12 and the cover body 12, while the second portion 151 is located between the first protection member 14 and the peripheral wall.

[0155] In some embodiments, the first protection member 14 does not interfere with the second protection member 15 , and there is no overlapping area between the two.

[0156] In the above scheme, the first part 150 can effectively wrap the cover 12 to improve the insulation of the cover 12, so that the battery cell 10 has a higher reliability. The second part 151 is arranged around the peripheral wall, so that the second protective member 15 can be effectively connected to the shell 11 and the cover 12, reducing the risk of the second protective member 15 being separated from the cover 12, so that the battery cell 10 has a higher reliability, and then the battery 100 has a higher reliability.

[0157] According to some embodiments of the present application, see Fig. 9 Along the third direction z, the first protection member 14 extends beyond the cover body 12 , and the portion of the first protection member 14 extending beyond the cover body 12 is folded over the cover body 12 . The portion of the first protection member 14 extending beyond the cover body 12 is located between the cover body 12 and the first portion 150 .

[0158] Or, according to other embodiments of the present application, see Fig.10 , Fig.10 Schematic diagrams of battery cells 10 in some other embodiments of the present application. The portion of the first protection member 14 that extends beyond the cover 12 is located on the surface of the first portion 150 that is away from the cover 12 .

[0159] In some embodiments, along the third direction z, the first protective member 14 protrudes from the cover body 12. "The portion of the first protective member 14 protruding from the cover body 12 is located between the cover body 12 and the first portion 150" can be understood as that the portion of the first protective member 14 is disposed between the housing 10a and the second protective member 15. For example, in some embodiments, when assembling the first protective member 14 and the second protective member 15, the first protective member 14 can be assembled to the housing 10a first, and then the second protective member 15 can be assembled to the housing 10a. For example, the first portion 150 of the second protective member 15 is bonded to a portion of the cover body 12 through an adhesive layer, and the surface of the portion of the first protective member 14 folded over the cover body 12. The second portion 151 of the second protective member 15 is bonded to the surface of the portion of the first protective member 14 corresponding to the peripheral wall through an adhesive layer.

[0160] “The portion of the first protective member 14 that extends beyond the cover body 12 is located on the surface of the first portion 150 that is away from the cover body 12” can be understood as that a portion of the second protective member 15 is disposed between the housing 10a and the first protective member 14. By way of example, in some embodiments, when assembling the first protective member 14 and the second protective member 15, the second protective member 15 can be assembled to the housing 10a first, and then the first protective member 14 can be assembled to the housing 10a. By way of example, the second portion 151 of the second protective member 15 is bonded to the peripheral wall through an adhesive layer, a portion of the first protective member 14 is bonded to the surface of the second portion 151 through an adhesive layer, the first portion 150 of the second protective member 15 is bonded to the cover body 12 through an adhesive layer, and a portion of the first protective member 14 that is folded over the cover body 12 is bonded to the surface of the first portion 150 through an adhesive layer.

[0161] In the above solution, the portion of the first protective member 14 extending beyond the cover 12 is connected to the second protective member 15 , which can effectively improve the connection stability between the first protective member 14 and the shell 11 , reduce the risk of the first protective member 14 detaching from the shell 11 , and make the battery cell 10 have higher reliability.

[0162] According to some embodiments of the present application, one of the following conditions is met:

[0163] (1) Along the third direction z, the end surface of the first protection member 14 away from the first end wall 110 is flush with the surface of the cover body 12 away from the first end wall 110 .

[0164] (2) Along the third direction z, the surface of the cover body 12 away from the first end wall 110 exceeds the end surface of the first protection member 14 away from the first end wall 110 .

[0165] (3) Along the third direction z, the end surface of the first protection member 14 away from the first end wall 110 is flush with the surface of the first portion 150 away from the cover body 12 .

[0166] In some embodiments, along the third direction z, the end surface of the first protective member 14 away from the first end wall 110 can be regarded as the upper end surface of the first protective member 14 , and the surface of the cover body 12 away from the first end wall 110 can be regarded as the upper surface of the cover body 12 .

[0167] In some embodiments, Fig.10 Along the third direction z, the end surface of the first protection member 14 away from the first end wall 110 is flush with the surface of the cover body 12 away from the first end wall 110 .

[0168] “The end surface of the first protective member 14 away from the first end wall 110 is flush with the surface of the cover body 12 away from the first end wall 110” can be understood as that the size of the first protective member 14 in the third direction z is the same as the size of the outer shell 10a, and when the cover body 12 is provided with the second protective member 15, the second protective member 15 will protrude from the first protective member 14 in the third direction z.

[0169] In other embodiments of the present application, see Fig.11 , Fig.11 Schematic diagrams of battery cells 10 in other embodiments of the present application. “Along the third direction z, the surface of the cover body 12 away from the first end wall 110 exceeds the end surface of the first protective member 14 away from the first end wall 110” can be understood as that the upper end surface of the first protective member 14 is located below the upper surface of the cover body 12. When the cover body 12 is provided with a second protective member 15, in the third direction z, the second protective member 15 will protrude from the first protective member 14, and at least part of the second portion 151 of the second protective member 15 will be exposed to the outside.

[0170] In other embodiments of the present application, “along the third direction z, the end surface of the first protection member 14 away from the first end wall 110 is flush with the surface of the first portion 150 away from the cover body 12” can be understood as that the upper end surface of the first protection member 14 is flush with the upper surface of the first portion 150. When the cover body 12 is provided with the second protection member 15, the second protection member 15 will not protrude from the first protection member 14 in the third direction z.

[0171] According to some embodiments of the present application, a battery 100 is further provided. The battery 100 includes the battery cell 10 described above.

[0172] In some embodiments, Figure 2The battery 100 includes a box 20 and a battery cell 10, and one or more battery cells 10 are accommodated in the box 20. The box 20 is used to provide a storage space for the battery cell 10, and the box 20 can adopt a variety of structures. In some embodiments, the box 20 may include a first sub-box 21 and a second sub-box 22, and the first sub-box 21 and the second sub-box 22 cover each other, and the first sub-box 21 and the second sub-box 22 jointly define a storage space for accommodating the battery cell 10.

[0173] According to some embodiments of the present application, there is further provided an electric device, which includes the battery cell 10 described above, and the battery cell 10 is used to provide electric energy.

[0174] According to some embodiments of the present application, a battery cell 10 is provided. Figure 3-Figure 9 .

[0175] The battery cell 10 includes an outer shell 10a and a first protective member 14. The outer shell 10a includes a shell 11 and a cover 12. The cover 12 is connected to the shell 11 and closes the opening of the shell 11, so that the electrode assembly of the battery cell 10 is located in a closed space.

[0176] The housing 11 includes a first end wall 110 and a peripheral wall surrounding an edge of the first end wall 110 .

[0177] The peripheral wall may include a first wall 111, a second wall 112, a third wall 113 and a fourth wall 114. The first wall 111 and the third wall 113 are arranged opposite to each other in the first direction x, and the second wall 112 and the fourth wall 114 are arranged opposite to each other in the second direction y. The first end wall 110 and the cover body 12 may be arranged opposite to each other in the third direction z. Along the circumference of the shell 11, the first wall 111, the second wall 112, the third wall 113 and the fourth wall 114 are connected in sequence. The first direction x, the second direction y and the third direction z are perpendicular to each other. In some embodiments, the first direction x may be the thickness direction of the shell 11, the second direction y may be the width direction of the shell 11, and the third direction z may be the height direction of the shell 11. In some embodiments, the area of ​​the outer surface of the first wall 111 is equal to the area of ​​the outer surface of the third wall 113, the area of ​​the outer surface of the second wall 112 is equal to the area of ​​the outer surface of the fourth wall 114, and the area of ​​the outer surface of the first wall 111 is greater than the area of ​​the outer surface of the second wall 112.

[0178] The first protective member 14 may be a blue film, and the first protective member 14 is covered on the housing 11 by folding. For example, Figure 4 As shown, the housing 11 is placed on the first protective member 14 in the unfolded state, and the first end wall 110 of the housing 11 is in contact with the protective member; then, Figure 5As shown, the first protection member 14 is folded toward the first wall 111 along the edge between the first end wall 110 and the first wall 111 , and the first region 140 covers the first wall 111 .

[0179] The first protection member 14 is folded toward the third wall 113 along the edge between the first end wall 110 and the third wall 113, and the third area 142 covers the third wall 113. Figure 6 As shown, the first protection member 14 is folded toward the second wall 112 along the edge between the first end wall 110 and the second wall 112 to form a second area 141 wrapped around the second wall 112, a first overlapping area 144 connecting the first area 140 and the second area 141, and a second overlapping area 145 connecting the third area 142 and the second area 141. The first protection member 14 is folded toward the fourth wall 114 along the edge between the first end wall 110 and the fourth wall 114 to form a fourth area 143 wrapped around the fourth wall 114, a third overlapping area 146 connecting the first area 140 and the fourth area 143, and a fourth overlapping area 147 connecting the third area 142 and the fourth area 143.

[0180] Then, Figure 7 As shown, the first overlapping area 144 is folded toward the first wall 111 along the edge between the first wall 111 and the second wall 112, and overlaps the first area 140. The second overlapping area 145 is folded toward the third wall 113 along the edge between the second wall 112 and the third wall 113, and overlaps the third area 142. The third overlapping area 146 is folded toward the first wall 111 along the edge between the first wall 111 and the fourth wall 114, and overlaps the first area 140. The fourth overlapping area 147 is folded toward the third wall 113 along the edge between the fourth wall 114 and the third wall 113, and overlaps the third area 142. Figure 8 As shown, along the third direction z, the first protective member 14 has a portion extending beyond the cover body 12. An operator or mechanical equipment can cut the first protective member 14 located above the cover body 12 along the edge between the first wall 111 and the second wall 112, cut the first protective member 14 located above the cover body 12 along the edge between the third wall 113 and the second wall 112, cut the first protective member 14 located above the cover body 12 along the edge between the first wall 111 and the fourth wall 114, cut the first protective member 14 located above the cover body 12 along the edge between the third wall 113 and the fourth wall 114, and then fold the portion of the first protective member 14 extending beyond the cover body 12 toward the cover body 12.

[0181] Figure 8As shown, along the third direction z, the first protective member 14 has a portion extending beyond the cover body 12. An operator or mechanical equipment can cut the first protective member 14 located above the cover body 12 along the edge between the first wall 111 and the second wall 112, cut the first protective member 14 located above the cover body 12 along the edge between the third wall 113 and the second wall 112, cut the first protective member 14 located above the cover body 12 along the edge between the first wall 111 and the fourth wall 114, cut the first protective member 14 located above the cover body 12 along the edge between the third wall 113 and the fourth wall 114, and then fold the portion of the first protective member 14 extending beyond the cover body 12 toward the cover body 12.

[0182] In some embodiments, along the third direction z, the first protection member 14 may not exceed the cover body 12 .

[0183] In some embodiments, the battery cell 10 further includes a second protective member 15 , which includes a first portion 150 and a second portion 151 connected to each other. The first portion 150 is coated on the outer surface of the cover 12 , and the second portion 151 is disposed around the peripheral wall.

[0184] In some embodiments, Fig. 9 When assembling the first protective member 14 and the second protective member 15, the first protective member 14 can be assembled to the housing 10a first, and then the second protective member 15 can be assembled to the housing 10a. Exemplarily, the first portion 150 of the second protective member 15 is bonded to a part of the cover 12 through an adhesive layer, and the surface of the portion of the first protective member 14 folded over the cover 12. The second portion 151 of the second protective member 15 is bonded to the surface of the portion of the first protective member 14 corresponding to the peripheral wall through an adhesive layer.

[0185] In other embodiments, when assembling the first protective member 14 and the second protective member 15, the second protective member 15 may be assembled to the housing 10a first, and then the first protective member 14 may be assembled to the housing 10a. For example, the second portion 151 of the second protective member 15 is bonded to the peripheral wall through an adhesive layer, a portion of the first protective member 14 is bonded to the surface of the second portion 151 through an adhesive layer, the first portion 150 of the second protective member 15 is bonded to the cover body 12 through an adhesive layer, and a portion of the first protective member 14 folded over the cover body 12 is bonded to the surface of the first portion 150 through an adhesive layer.

[0186] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. 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 shell, comprising a first end wall and a peripheral wall arranged around the edge of the first end wall, the peripheral wall having a first wall in a first direction, the peripheral wall having a second wall in a second direction, the first wall and the second wall being arranged adjacent to each other, the area of ​​the outer surface of the first wall being larger than the area of ​​the outer surface of the second wall, and the first direction and the second direction being perpendicular to each other; The first protective member at least partially covers the outer surface of the shell, and includes a first area, a second area and a first overlapping area. The first overlapping area connects the first area and the second area. The first area covers the first wall, the second area covers the second wall, and the first overlapping area is folded over the first area.

2. The battery cell according to claim 1, characterized in that: The size of the first area in the third direction is equal to the size of the second area in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

3. The battery cell according to claim 1, characterized in that: The first overlapping area includes a first sub-overlapping area and a second sub-overlapping area, one end of the first sub-overlapping area is connected to the first area, one end of the second sub-overlapping area is connected to the second area, and the other end of the first sub-overlapping area and the other end of the second sub-overlapping area are connected to each other; along the thickness direction of the first wall, the first sub-overlapping area is overlapped with the first area, and the second sub-overlapping area is overlapped with the first sub-overlapping area.

4. The battery cell according to claim 3, characterized in that: The surface of the first sub-overlapping region facing away from the second sub-overlapping region is bonded to the first region; and / or, The first overlapping sub-region and the second overlapping sub-region are bonded to each other.

5. The battery cell according to claim 1, characterized in that: The peripheral wall further has a third wall in the first direction, the third wall is arranged opposite to the first wall, and the area of ​​the outer surface of the third wall is larger than the area of ​​the outer surface of the second wall; The first protection member further includes a third area and a second overlapping area, the second overlapping area connects the second area and the third area, the third area is wrapped around the third wall, and the second overlapping area is folded over the third area.

6. The battery cell according to claim 5, characterized in that: Along the third direction, the first area, the second area and the third area have the same size, and the first direction, the second direction and the third direction are perpendicular to each other.

7. The battery cell according to claim 5, characterized in that: The second overlapping area includes a third sub-overlapping area and a fourth sub-overlapping area, one end of the third sub-overlapping area is connected to the third area, one end of the fourth sub-overlapping area is connected to the second area, and the other end of the third sub-overlapping area and the other end of the fourth sub-overlapping area are connected to each other; along the thickness direction of the third wall, the third sub-overlapping area is overlapped with the third area, and the fourth sub-overlapping area is overlapped with the third sub-overlapping area.

8. The battery cell according to claim 7, characterized in that: The surface of the third sub-overlapping region which faces away from the fourth sub-overlapping region is bonded to the third region; and / or, The third overlapping sub-region and the fourth overlapping sub-region are bonded to each other.

9. The battery cell according to claim 5, characterized in that: The peripheral wall further has a fourth wall in the second direction, and the fourth wall is arranged opposite to the second wall; The first protective member also includes a fourth area, a third overlapping area and a fourth overlapping area, the third overlapping area connects the first area and the fourth area, the fourth overlapping area connects the third area and the fourth area, the fourth area is covered by the fourth wall, the third overlapping area is folded over the first area, and the fourth overlapping area is folded over the third area.

10. The battery cell according to claim 1, characterized in that: An adhesive layer is arranged between the first protection member and the outer surface of the shell.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The battery cell also includes a cover and an electrode terminal. Along the third direction, the cover is arranged opposite to the first end wall, the cover closes the opening of the shell, and the electrode terminal is arranged on the cover. The first direction, the second direction and the third direction are perpendicular to each other.

12. The battery cell according to claim 11, characterized in that: The battery cell further includes a second protective member, at least a portion of which is covered on the outer surface of the cover.

13. The battery cell according to claim 12, characterized in that: The second protection member includes a first portion and a second portion connected to each other, the first portion is coated on the outer surface of the cover body, and the second portion is disposed around the peripheral wall.

14. The battery cell according to claim 13, characterized in that: Along the third direction, the first protection member extends beyond the cover body, and a portion of the first protection member extending beyond the cover body is folded over the cover body; The portion of the first protection member that extends beyond the cover body is located between the cover body and the first portion; or, The portion of the first protection member that protrudes from the cover body is located on a surface of the first portion that is away from the cover body.

15. The battery cell according to claim 13, characterized in that: One of the following conditions is met: (1) Along the third direction, an end surface of the first protective member away from the first end wall is flush with a surface of the cover body away from the first end wall; (2) Along the third direction, the surface of the cover body away from the first end wall exceeds the end surface of the first protective member away from the first end wall; (3) Along the third direction, an end surface of the first protective member away from the first end wall is flush with a surface of the first portion away from the cover body.

16. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 15.

17. An electrical device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 15, wherein the battery cell is used to provide electrical energy.

Images