Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a laminated naked battery cell (210) and side supporting plates (220) for laterally supporting the naked battery cell (210), and is characterized in that at least one side supporting plate (220) comprises a base layer (221) and a reinforcing layer (222) which are made of thermoplastic plastics, and the bending strength of the reinforcing layer (222) is higher than that of the base layer (221). According to the battery monomer disclosed by the embodiment of the invention, the side supporting plate has improved strength on the whole, so that the side supporting plate is not easy to deform and can better laterally support the naked battery cell, and the naked battery cell can be prevented from being deformed and damaged when entering a shell. Therefore, the structural stability, the safety and the service life of the battery monomer comprising the side supporting plate can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery cell, a battery, and an electrical device. Background Technology

[0002] Power batteries are the core component of new energy vehicles and an important direction for future energy transition. To meet the requirements for battery energy density, batteries typically include one or more battery modules connected in series and / or parallel, and each battery module can include multiple battery cells connected in series and / or parallel. Therefore, batteries usually consist of multiple battery cells.

[0003] Battery cells may include stacked bare cells manufactured through a lamination process or wound bare cells manufactured through a winding process. For battery cells including stacked bare cells, the side support plates used to support the bare cells need to meet certain strength requirements in order to ensure that the battery cell has better structural stability, more reliable safety, and a longer service life. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery, and an electrical device, wherein the side support plate for the battery cell has increased strength, thereby improving the structural stability, safety, and service life of the battery cell.

[0005] In a first aspect, this application provides a battery cell comprising stacked bare cells and side support plates for laterally supporting the bare cells, characterized in that at least one of the side support plates comprises a base layer and a reinforcing layer made of thermoplastic plastic, wherein the bending strength of the reinforcing layer is higher than the bending strength of the base layer.

[0006] Therefore, according to the technical solution of this application, the side support plate is constructed as a composite structure with at least two layers. The base layer of the side support plate, made of thermoplastic plastic, can be configured for welding to the top support and / or bare battery cells to meet hot-melt requirements. The reinforcing layer of the side support plate, with higher bending strength, can be configured to improve the bending strength of the side support plate. Therefore, compared with the side support plates of the prior art, the side support plate has improved overall strength, making it less prone to deformation and providing better lateral support for the bare battery cells, thus helping to prevent deformation and damage to the bare battery cells during casing. Consequently, the structural stability, safety, and service life of the battery cell including this side support plate can be improved.

[0007] In some embodiments, the base layer is made of polypropylene, and / or the reinforcing layer is made of polybutylene terephthalate, polyethylene terephthalate, or polyetheretherketone. This allows for a cost-effective increase in the strength of the side support plate.

[0008] In some embodiments, the base layer and the reinforcing layer are arranged in a stacked manner. This simplifies the fabrication of the side support plate, thereby reducing manufacturing costs and increasing manufacturing process feasibility.

[0009] In some embodiments, the side support plate further includes an intermediate layer located between the base layer and the reinforcing layer, and the base layer, the reinforcing layer, and the intermediate layer are arranged in a stacked manner. Thus, the intermediate layer can be used to achieve other functions as needed, such as a connection function linking the base layer and the reinforcing layer.

[0010] In some embodiments, the intermediate layer is made of adhesive. Thus, the intermediate layer enables the bonding of composite components.

[0011] In some embodiments, the base layer is arranged to surround the reinforcing layer. The side support plate may be constructed as a composite structure with two layers that are firmly connected.

[0012] In some embodiments, the base layer is manufactured by extrusion molding. This allows for the simple fabrication of the base layer for the side support plate.

[0013] In some embodiments, the reinforcing layer is encapsulated and injection molded onto the base layer. This allows for the simple fabrication of the reinforcing layer for the side support plate.

[0014] In some embodiments, the battery cell further includes a top bracket, the base layer being made of the same material as the top bracket, and the base layer facing the bare battery cell and the top bracket during assembly. This facilitates a secure connection between the side support plate and the top bracket.

[0015] In some embodiments, the battery cell further includes a housing with two openings and a bottom cover plate configured to close one of the openings of the housing. This allows the housing, top support, and bottom cover plate to create an internal environment for the bare cell and protect it from external environmental influences.

[0016] Secondly, this application provides a battery that includes the battery cell described in the above embodiments.

[0017] Thirdly, this application provides an electrical device that includes the battery described in the above embodiments, the battery being used to provide electrical energy.

[0018] The battery and power supply device according to this application also have the same advantages as the battery cell according to this application, which will not be repeated here.

[0019] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a vehicle according to an embodiment of this application;

[0022] Figure 2 This is an exploded structural diagram of a battery according to an embodiment of this application;

[0023] Figure 3 This is a schematic exploded perspective view of a battery cell according to an embodiment of this application;

[0024] Figure 4 A schematic perspective view of a housing for a battery cell according to an embodiment of this application;

[0025] Figure 5 A schematic cross-sectional view of a first embodiment of a side support plate for a battery cell according to an embodiment of this application;

[0026] Figure 6 This is a schematic cross-sectional view of a second embodiment of a side support plate for a battery cell according to an embodiment of this application.

[0027] The reference numerals in the detailed embodiments are as follows:

[0028] 1000 vehicles, 1100 batteries, 1200 controllers, 1300 motors;

[0029] 100 Battery housing, 11 First part, 12 Second part;

[0030] 200 battery cell, 210 bare cell, 220 side support plate, 230 top bracket, 240 bottom cover plate, 250 casing;

[0031] 221 Base layer, 222 Enhancement layer, 223 Intermediate layer. Detailed Implementation

[0032] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0037] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0038] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0040] As mentioned above, a single battery cell may include a stacked bare cell manufactured by a stacking process or a wound bare cell manufactured by a winding process.

[0041] In battery cells comprising stacked bare cells, the bare cells are typically placed into the casing, primarily by gravity. Because bare cells are relatively soft, and especially because they are relatively long in their longitudinal direction, side supports can be provided to laterally support them and prevent bending, bulging, and / or scratching during placement into the casing. In this case, the side supports can be welded to the bare cells before they are placed into the casing, and then the bare cells and top support can be placed into the casing together, primarily by gravity. The casing can then be closed using the top support and / or bottom cover. Therefore, the side supports used to support the bare cells need to meet certain strength requirements, particularly bending strength.

[0042] The applicant has discovered that in existing battery cells, including those with stacked bare cells, the side supports used to laterally support the bare cells are typically made of a relatively soft material, such as polypropylene (PP). These polypropylene side supports soften, i.e., their bending strength decreases, for example, when heat-fused during welding, and thus they can no longer reliably support the bare cells. Furthermore, when placing the bare cells into the casing, particularly using gravity, deformation of the side supports and / or the bare cells can make installation difficult, and may even cause the side supports to detach from the bare cells. In addition, the bare cells may also be damaged during installation.

[0043] In view of this, the concept of this application is to improve the strength, especially the bending strength, of the side support plate used for lateral support of bare cells by constructing the side support plate as a multi-layer composite structure, thereby giving the battery cell better structural stability, more reliable safety and longer service life.

[0044] This application provides a single battery cell, which can be used, but is not limited to, in battery modules, battery packs, batteries, etc.

[0045] This application also provides a battery having the battery cells described in this application, which can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. The power system of such an electrical device can be composed of batteries having the battery cells described in this application. This is beneficial for improving battery safety, stability, and battery life.

[0046] This application also provides an electrical device incorporating the battery of this application embodiment, which may, but is not limited to, be configured as a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. The electric toy may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., while the spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0047] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0048] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 1100 is disposed inside the vehicle 1000, and the battery 1100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 1100 can be used to power the vehicle 1000; for example, the battery 1100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery 1100 to supply power to the motor 1300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0049] In some embodiments of this application, the battery 1100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0050] Please refer to Figure 2 , Figure 2This is an exploded view of a battery 1100 provided in some embodiments of this application. The battery 1100 includes a battery housing 100 and a battery cell 200, with the battery cell 200 housed within the battery housing 100. The battery housing 100 provides a space for the battery cell 200, and can employ various structures. In some embodiments, the battery housing 100 may include a first portion 110 and a second portion 120, which overlap each other, jointly defining a space for accommodating the battery cell 200. The second portion 120 may be a hollow structure open at one end, and the first portion 110 may be a plate-like structure, covering the open side of the second portion 120 so that the first portion 110 and the second portion 120 jointly define the space; alternatively, the first portion 110 and the second portion 120 may both be hollow structures open on one side, with the open side of the first portion 110 covering the open side of the second portion 120. Of course, the battery box 100 formed by the first part 110 and the second part 120 can be of various shapes, such as cylinder, cuboid, etc.

[0051] In battery 1100, there can be multiple battery cells 200, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 200 are connected in both series and parallel configurations. Multiple battery cells 200 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 200 is housed within battery housing 100. Alternatively, battery 1100 can also be composed of multiple battery cells 200 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within battery housing 100. Battery 1100 may also include other structures; for example, battery 1100 may also include a busbar component for electrical connection between multiple battery cells 200.

[0052] Each battery cell 200 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 200 can be cylindrical, flat, cuboid, or other shapes.

[0053] Please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic exploded perspective view of a battery cell 200 according to an embodiment of this application. Figure 4 This is a schematic perspective view of a housing 250 for a battery cell 200 according to an embodiment of this application. The battery cell 200 may be the smallest unit that makes up a battery. The battery cell 200 may include a stacked bare cell 210, a side support plate 220, a top bracket 230, a bottom cover plate 240, and a housing 250.

[0054] The stacked bare cell 210 can be manufactured using a stacking process. The bare cell 210 can be relatively long in its longitudinal direction, thus allowing for an elongated shape. The bare cell 210 is the component in the battery cell 200 where the electrochemical reaction occurs. The bare cell 210 is mainly formed by stacking positive and negative electrode sheets, and a separator is typically provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the bare cell 210, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0055] Side support plates 220 may be provided for lateral support of the bare cell 210 to prevent deformation of the loose bare cell 210. One or more side support plates 220 may be provided as needed. In particular, when the bare cell 210 is constructed in a parallelepiped shape (e.g., cuboid shape), at least two side support plates 220 may be provided to laterally support at least two opposite sides of the bare cell 210.

[0056] The housing 250 can be configured to form the internal environment of the battery cell 200, wherein the formed internal environment can accommodate the bare cell 210, electrolyte, and other components. The housing 250 may have an opening, which can be closed by a top bracket 230 and / or a bottom cover 240 to form the internal environment of the battery cell 200. Alternatively, the top bracket 230 or bottom cover 240 can be integrated with the housing 250. Specifically, the top bracket 230 or bottom cover 240 and the housing 250 can form a common connection surface before other components are inserted into the housing. When it is necessary to encapsulate the internal environment of the housing 250, the top bracket 230 or bottom cover 240 is used to close the housing 250. The housing 250 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 250 can be determined according to the specific shape and size of the bare cell 210. The material of the housing 250 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0057] The top bracket 230 and the bottom cover plate 240 may each be provided with openings for sealing the housing 250 to isolate the internal environment of the battery cell 200 from the external environment. Therefore, the top bracket 230, the bottom cover plate 240, and the housing 250 can be collectively configured to protect the bare cell 210 from external environmental influences. Furthermore, the top bracket 230 and / or the bottom cover plate 240 may be provided with tabs to expose the bare cell 210 for input or output of electrical energy into the battery cell 200.

[0058] According to some embodiments of this application, refer to Figure 3 and Figure 4 Please refer to further details. Figure 5 and Figure 6 ( Figure 5 and Figure 6 A schematic embodiment of a side support plate 220 for a battery cell 200 according to an embodiment of this application is shown. A battery cell 200 is provided, which may include stacked bare cells 210 and side support plates 220 for laterally supporting the bare cells 210. At least one side support plate 220 (e.g., all side support plates 220) may include a base layer 221 and a reinforcing layer 222 made of thermoplastic, wherein the flexural strength of the reinforcing layer 222 is higher than that of the base layer 221.

[0059] Therefore, the side support plate 220 is constructed as a composite structure with at least two layers. The base layer 221 of the side support plate 220, made of thermoplastic, can be configured for welding, for example, ultrasonic welding, to the top support 230 and / or the bare cell 210 to meet heat fusion requirements. The reinforcing layer 222 of the side support plate 220, with higher bending strength, can be configured to improve the bending strength of the side support plate 220. Therefore, compared to prior art side support plates, the side support plate 220 has improved overall strength, making it less prone to deformation and providing better lateral support for the bare cell 210, thus helping to prevent deformation and damage to the bare cell 210 during casing. Consequently, the structural stability, safety, and service life of the battery cell 200 can be improved.

[0060] According to some embodiments of this application, optionally, the base layer 221 may be made of polypropylene (PP). That is, the base layer 221 may be made of the same material as the side support plate of the prior art. The reinforcing layer 222 may be made of high flexural strength and electrolyte resistant polybutylene terephthalate (PBT), polyethylene terephthalate (PET), or polyetheretherketone (PEEK).

[0061] The flexural strength of PP is approximately 25 MPa, therefore, in the prior art side support plates, the flexural strength of the side support plates is also approximately 25 MPa. However, in the embodiments of this application, since the side support plate 220 includes a base layer 221 and a reinforcing layer 222, the flexural strength of the side support plate can reach higher than 50 MPa.

[0062] This allows for a cost-effective increase in the strength of the side support plate 220.

[0063] According to some embodiments of this application, optionally, and particularly referring to... Figure 5 The base layer 221 and the reinforcement layer 222 can be stacked.

[0064] Therefore, the side support plate 220 can be manufactured simply, thereby reducing manufacturing costs and increasing the feasibility of the manufacturing process.

[0065] According to some embodiments of this application, optionally, and particularly referring to... Figure 5 The side support plate 220 may also include an intermediate layer 223. The intermediate layer 223 may be located between the base layer 221 and the reinforcing layer 222, and the base layer 221, the reinforcing layer 222 and the intermediate layer 223 may be stacked.

[0066] Therefore, other functions can be implemented using the intermediate layer 223 as needed, such as the connection function between the base layer and the enhancement layer.

[0067] According to some embodiments of this application, the intermediate layer 223 may optionally be made of adhesive. Thus, the intermediate layer 223 can firmly connect the base layer 221 and the reinforcing layer 222, thereby achieving a composite function.

[0068] According to some embodiments of this application, optionally, and particularly referring to... Figure 6 The base layer 221 can be arranged to surround the reinforcement layer 222. In other words, the reinforcement layer 222 can be embedded in the base layer 221.

[0069] Thus, the side support plate 220 can be constructed as a composite structure with two layers that are firmly connected.

[0070] According to some embodiments of this application, the base layer 221 may optionally be manufactured by extrusion molding. This allows for the simple fabrication of the base layer 221 of the side support plate 220.

[0071] According to some embodiments of this application, the reinforcing layer 222 may optionally be encapsulated and injection molded onto the base layer 221. This allows for the simple fabrication of the reinforcing layer 222 of the side support plate 220.

[0072] According to some embodiments of this application, optionally, and particularly referring to... Figure 3 The battery cell 200 may also include a top support 230. The base layer 221 may be made of the same material as the top support 230, and during assembly, the base layer 221 may face the bare cell 210 and the top support 230.

[0073] This facilitates a secure connection between the side support plate 220 and the top bracket 230. In this configuration, during assembly, the side support plate 220 can first be welded to the bare battery cell 210 and the top bracket 230. Then, the side support plate 220, the bare battery cell 210, and the top bracket 230 can be placed together, particularly by gravity, into the housing 250. Subsequently, the housing 250 can be closed using the bottom cover plate 240.

[0074] In this regard, according to some embodiments of this application, optionally, and particularly referring to... Figure 3 and Figure 4 The battery cell 200 may also include a housing 250 having two openings and a bottom cover 240 configured to close one of the openings of the housing 250.

[0075] The housing 250, top bracket 230 and bottom cover 240 can be used to form an internal environment for the bare cell 210 and protect the bare cell 210 from the influence of the external environment.

[0076] According to some embodiments of this application, this application also provides a battery 1100, including the battery cell 200 described in any of the above embodiments.

[0077] According to some embodiments of this application, this application also provides an electrical device including the battery 1100 described in any of the above embodiments, and the battery 1100 can be used to provide electrical energy to the electrical device.

[0078] The electrical device can be any of the aforementioned battery-powered devices or systems.

[0079] According to some embodiments of this application, particularly referring to Figure 3-6 This application provides a battery cell 100, which may include a stacked bare cell 210 and a side support plate 220 for laterally supporting the bare cell 210. At least one side support plate 220 may include a base layer 221 made of thermoplastic and a reinforcing layer 222 with a flexural strength higher than that of the base layer 221. The base layer 221 may be made of polypropylene (PP), and the reinforcing layer 222 may be made of polybutylene terephthalate (PBT), polyethylene terephthalate (PET), or polyetheretherketone (PEEK). The base layer 221 and the reinforcing layer 222 may be stacked, or the base layer 221 may be arranged to surround the reinforcing layer 222. The battery cell 200 may also include a top support 230; the material of the base layer 221 may be the same as that of the top support 230, and the base layer 221 may face the bare cell 210 and the top support 230 during assembly. The battery cell 200 may also include a housing 250 having two openings and a bottom cover 240 configured to close one of the openings of the housing 250.

[0080] Therefore, in the battery cell according to the embodiments of this application, the side support plate is constructed as a composite structure with two or more layers, including a bending strength reinforcing layer and thus having improved overall strength. Consequently, the side support plate according to this application is less prone to deformation and can better support the bare cell laterally, thus helping to prevent deformation and damage to the bare cell during casing. Thus, the structural stability, safety, and service life of the battery cell including this side support plate can be improved.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, comprising a laminated bare cell (210) and a side bracket (220) for laterally supporting the bare cell (210), characterized in that At least one of the side brackets (220) comprises a base layer (221) made of thermoplastic and a reinforcing layer (222), the reinforcing layer (222) having a higher bending strength than the base layer (221).

2. The battery cell of claim 1, wherein, The base layer (221) is made of polypropylene, and / or the reinforcing layer (222) is made of polybutylene terephthalate, polyethylene terephthalate, or polyether ether ketone.

3. The battery cell according to claim 1 or 2, wherein The base layer (221) and the reinforcing layer (222) are arranged in a stack.

4. The battery cell according to claim 1 or 2, wherein The side bracket (220) further comprises an intermediate layer (223) between the base layer (221) and the reinforcing layer (222), and the base layer (221), the reinforcing layer (222), and the intermediate layer (223) are arranged in a stack.

5. The battery cell of claim 4, wherein, The intermediate layer (223) is made of adhesive.

6. The battery cell of claim 1 or 2, wherein, The base layer (221) is arranged to surround the reinforcing layer (222).

7. The battery cell of claim 6, wherein the cathode comprises a lithium metal oxide. The base layer (221) is made by extrusion molding.

8. The battery cell of claim 6, wherein the cathode comprises a lithium metal oxide. The reinforcing layer (222) is overmolded on the base layer (221).

9. The battery cell of claim 1 or 2, wherein, The battery cell further comprises a top bracket (230), the material of the base layer (221) is the same as the material of the top bracket (230), and the base layer (221) faces the bare cell (210) and the top bracket (230) when assembled.

10. The battery cell of claim 9, wherein, The battery cell further comprises a housing (250) having two openings and a bottom cover plate (240) configured to close one of the openings of the housing (250).

11. A battery, characterized by Comprising: The battery cell of any one of claims 1 to 10.

12. An electrical device, characterized by The electrical device comprises the battery of claim 11, the battery being used to provide electrical energy.

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