Battery, electric device, method and apparatus for manufacturing battery

Abstract

Embodiments of the present application provide a battery, a power consumption device, a method and an apparatus for manufacturing a battery. The battery comprises: a battery cell group comprising a plurality of battery cells arranged along a first direction; a box comprising a first beam and a second beam arranged at intervals along the first direction, the battery cell group being arranged between the first beam and the second beam, wherein at least one of the first beam and the second beam is a locking beam, and a wedge-shaped gap is formed between the locking beam and the battery cell group; and a wedge-shaped component for filling the wedge-shaped gap to lock the battery cell group to the box. The above technical solution can improve the rigidity and strength of the battery, thereby improving the performance of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery, an electrical device, a method and apparatus for manufacturing a battery. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development.

[0003] Batteries are installed in electrical devices, such as vehicles. The movement of these devices can cause impacts on the battery. If the battery's rigidity and strength are weak, these impacts can adversely affect its performance and potentially cause safety issues. Therefore, improving the rigidity and strength of batteries is a pressing technical problem that needs to be solved in battery technology. Summary of the Invention

[0004] This application provides a battery, an electrical device, a method and apparatus for manufacturing a battery, which can improve the rigidity and strength of the battery, thereby enhancing the battery's performance.

[0005] In a first aspect, a battery is provided, comprising: a battery cell assembly including a plurality of battery cells arranged along a first direction; a housing including a first beam and a second beam spaced apart along the first direction, the battery cell assembly being disposed between the first beam and the second beam, wherein at least one of the first beam and the second beam is a locking beam, and a wedge-shaped gap is formed between the locking beam and the battery cell assembly; and a wedge-shaped component for filling the wedge-shaped gap to lock the battery cell assembly to the housing.

[0006] Based on the technical solution of this application embodiment, the wedge-shaped component and the wedge-shaped gap can reliably and stably lock the battery cell assembly to the casing. Furthermore, the interaction force between the battery cells due to compression causes adjacent battery cells to restrain each other, improving the structural stability of the battery, thereby increasing the overall rigidity and strength of the battery and reducing the safety risks caused by vibration and impact during use.

[0007] Furthermore, the wedge-shaped gap between the first beam and / or the second beam and the battery cell assembly facilitates the placement of the battery cell assembly into the housing, reducing the difficulty of installation. The wedge-shaped gap supports both methods: assembling multiple battery cells into modules before installation and then placing them into the housing, or placing the battery cells into the housing first and then securing them. After the battery cell assembly is placed into the housing, the wedge-shaped components fill the wedge-shaped gap to lock the battery cell assembly in place, thus improving assembly efficiency.

[0008] In some possible implementations, the wedge-shaped component is fixed to the locking beam.

[0009] In this embodiment, when the wedge-shaped component is fixed to the locking beam, there is no relative movement between the wedge-shaped component and the locking beam, and the positions of each component in the housing are also relatively fixed. This can improve the installation stability of the battery cell pack in the housing, thereby improving the overall rigidity and strength of the battery.

[0010] In some possible implementations, the locking beam is inclined toward the side of the battery cell assembly relative to the first direction, away from the battery cell assembly.

[0011] In some possible implementations, the locking beam is a trapezoidal beam.

[0012] In some possible implementations, the cross-section of the trapezoidal beam is a right trapezoid, an isosceles trapezoid, or a regular trapezoid.

[0013] In some possible implementations, the surface of the battery cell assembly facing the locking beam is inclined away from the locking beam relative to the first direction.

[0014] In this embodiment, a wedge-shaped gap is formed between the locking beam and the battery cell assembly. The wedge-shaped component can be inserted into the wedge-shaped gap from the end with the largest gap between the locking beam and the battery cell assembly to achieve locking and positioning of the battery cell assembly.

[0015] In some possible implementations, the angle between the face of the locking beam facing the battery cell assembly and the face of the battery cell assembly facing the locking beam is greater than 0° and less than 90°.

[0016] In this embodiment, the angle between the face of the locking beam facing the battery cell group and the face of the battery cell group facing the locking beam is taken as an appropriate value, which can not only achieve effective locking of the battery cell group, but also reduce the processing difficulty of the wedge-shaped component.

[0017] In some possible implementations, the wedge-shaped component includes a first surface and a second surface disposed opposite to each other, wherein the first surface is opposite to and parallel to the surface of the battery cell assembly facing the locking beam, and the second surface is opposite to and parallel to the surface of the locking beam facing the battery cell assembly.

[0018] This increases the contact area between the wedge-shaped component and the battery cell pack and the locking beam, thereby improving the locking capability of the wedge-shaped component to the battery cell pack.

[0019] In some possible implementations, the wedge-shaped component further includes: a third surface connecting the first surface and the second surface; and a first extension extending from the third surface away from the battery cell pack along the first direction, wherein the first extension is connected to the locking beam.

[0020] The wedge-shaped component is connected to the locking beam through the first extension, so that there is no relative movement between the wedge-shaped component and the locking beam, which can improve the locking ability of the wedge-shaped component to the battery cell pack, thereby improving the internal structural stability of the battery.

[0021] In some possible implementations, the first extension is bolted to the locking beam.

[0022] In some possible implementations, the battery further includes: an end plate disposed between and attached to the battery cell assembly, wherein the end plate has a step on the side facing the locking beam; wherein the wedge-shaped member further includes: a third surface connecting the first surface and the second surface; and a second extension extending from the third surface toward the battery cell assembly along the first direction, the second extension being configured to engage with the step to limit the end plate in a second direction, wherein the second direction is perpendicular to the first direction and perpendicular to the extension direction of the locking beam, the extension direction of the locking beam being perpendicular to the first direction.

[0023] The wedge-shaped component engages with the step on the end plate via the second extension, which can limit the end plate and the battery cell pack, thereby improving the installation stability of the battery cell pack in the housing.

[0024] Furthermore, in this embodiment, a wedge-shaped component is used to secure the battery cell assembly to the casing. Bolt holes with their axes perpendicular to the first direction are not required on the end plate. This reduces the thickness of the end plate in the first direction, thereby reducing the space occupied by the end plate and improving the space utilization within the battery. Furthermore, it can also increase the energy density of the battery.

[0025] In some possible implementations, the battery further includes: a busbar for electrically connecting the plurality of battery cells, the busbar being disposed at one end of the battery cell group in a third direction, the third direction being parallel to the extension direction of the locking beam, the extension direction of the locking beam being perpendicular to the first direction.

[0026] In some possible implementations, the first beam and the second beam are the sidewalls of the box body.

[0027] In some possible implementations, one of the first beam and the second beam is a side wall of the housing, and the other of the first beam and the second beam is a crossbeam located in the housing, wherein the crossbeam is used to separate the battery cell group from other battery cell groups.

[0028] In some possible implementations, the first beam and the second beam are crossbeams located in the housing, wherein the crossbeams are used to separate the battery cell group from other battery cell groups.

[0029] In a second aspect, an electrical device is provided, comprising: a battery as described in the first aspect or any possible embodiment of the first aspect, the battery being used to provide electrical energy to the electrical device.

[0030] Thirdly, a method for manufacturing a battery is provided, comprising: providing a battery cell assembly, the battery cell assembly including a plurality of battery cells arranged along a first direction; providing a housing, the housing including a first beam and a second beam spaced apart along the first direction, the battery cell assembly disposed between the first beam and the second beam, wherein at least one of the first beam and the second beam is a locking beam, and a wedge-shaped gap is formed between the locking beam and the battery cell assembly; providing a wedge-shaped component; and filling the wedge-shaped component into the wedge-shaped gap to lock the battery cell assembly to the housing.

[0031] Fourthly, an apparatus for manufacturing batteries is provided, comprising: a providing module for: providing a battery cell assembly, the battery cell assembly including a plurality of battery cells arranged along a first direction; providing a housing, the housing including a first beam and a second beam spaced apart along the first direction, the battery cell assembly disposed between the first beam and the second beam, wherein at least one of the first beam and the second beam is a locking beam, and a wedge-shaped gap is formed between the locking beam and the battery cell assembly; providing a wedge-shaped component; and an mounting module for: filling the wedge-shaped component into the wedge-shaped gap to lock the battery cell assembly to the housing. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a vehicle disclosed in one embodiment of this application;

[0034] Figure 2This is an exploded structural diagram of a battery disclosed in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the structure of a battery cell disclosed in an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the structure of a battery disclosed in one embodiment of this application;

[0037] Figure 5 yes Figure 4 A partial 3D schematic diagram of the battery;

[0038] Figure 6-9 This is a schematic diagram of the structure of a battery disclosed in one embodiment of this application;

[0039] Figure 10 This is a schematic diagram of the structure of a battery cell disclosed in an embodiment of this application;

[0040] Figure 11-14 A partial structural schematic diagram of a battery disclosed in one embodiment of this application;

[0041] Figure 15 yes Figure 14 A partial 3D schematic diagram of the battery;

[0042] Figure 16 This is a schematic top view of a battery disclosed in one embodiment of this application;

[0043] Figure 17 This is a schematic flowchart of a method for preparing a battery disclosed in an embodiment of this application;

[0044] Figure 18 This is a schematic block diagram of an apparatus for preparing a battery disclosed in an embodiment of this application.

[0045] The accompanying drawings are not drawn to scale.

[0046] Marker explanation:

[0047] 1-Vehicle; 10-Battery; 11-Box; 111-First Part; 112-Second Part; 101-First Beam; 102-Second Beam; 10a-First Locking Surface; 10b-Second Locking Surface; 10c-Third Locking Surface; 12-Wedge Gap; 121-First Wedge Gap; 122-Second Wedge Gap; 13-Wedge Component; 131-First Wedge Component; 132-Second Wedge Component; 1301-First Surface; 1302-Second Surface; 1303-Third Surface; 1304-First Extension; 1305-Second Extension; 2-Battery cell assembly; 20-Battery cell; 201-First wall; 202-Second wall; 211-Housing; 212a-First cover plate; 212b-Second cover plate; 213-Pressure relief mechanism; 214-Electrode terminal; 215a-First protective layer; 215b-Second protective layer; 216a-First bracket; 22-Electrode assembly; 221-First tab; 23-End plate; 231-Step; 231a-First step surface; 231b-Second step surface; 24-Busting component; 30-Controller; 40-Motor. Detailed Implementation

[0048] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise stated, "multiple" means two or more (including two); the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0050] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to non-detachable connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] 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 three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0053] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0054] In this application, a battery refers to a physical module comprising one or more battery cells to provide electrical energy. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing can reduce the impact of liquids or other foreign matter on the charging or discharging of the battery cells.

[0055] Optionally, a battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this application embodiment is not limited thereto. In some embodiments, a battery cell may also be referred to as a battery cell.

[0056] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated negative current collector protrudes beyond the coated one, serving as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To prevent melting when carrying a large current, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are also stacked together. The separator can be made of polypropylene (PP) or polyethylene (PE), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0057] The battery housing in this embodiment is used to house multiple battery cells, a busbar, and other battery components. In some embodiments, the housing may also include structures for securing the battery cells, such as crossbeams. The shape of the housing can be determined based on the number of battery cells it houses. In some embodiments, the housing may be square and have six walls.

[0058] The busbar components mentioned in this application are used to achieve electrical connections between multiple battery cells, such as in parallel, series, or mixed connections. The busbar components achieve electrical connections between battery cells by connecting the electrode terminals of the battery cells. In some embodiments, the busbar components can be fixed to the electrode terminals of the battery cells by welding. The busbar components transmit the voltage of the battery cells; when multiple battery cells are connected in series, a higher voltage is obtained. Accordingly, the electrical connection formed by the busbar components can also be referred to as a "high-voltage connection."

[0059] In some battery packaging technologies, multiple battery cells are first integrated into a battery module, and then the battery module is installed in a battery casing to form a battery pack. In other battery packaging technologies, multiple battery cells can be directly installed in a battery casing to form a battery pack; this technology is also called cell-to-pack (CTP) packaging. In CTP packaging, by eliminating the intermediate battery module, the weight of the battery pack can be reduced and the energy density of the battery can be increased. In other words, during the battery packaging process, multiple battery cells can be directly assembled into a battery, or they can first be assembled into a battery module, and then the battery module can be assembled into a battery. The battery is then further installed in electrical devices to provide power to those devices.

[0060] The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, and charge / discharge rate. Additionally, the structural stability of the battery must be considered to improve its safety in electrical devices.

[0061] In some battery packaging technologies, individual battery cells are fixed together with structural adhesive, giving the battery a certain strength and rigidity to prevent external impacts. However, in this case, the adhesive coverage area between the battery cells is limited, and there is no interaction force between the cells, affecting the installation stability of the battery cells in the enclosure. This impacts the structural stability of the battery, resulting in limited overall strength and rigidity of the packaged battery, and posing certain safety hazards.

[0062] In view of this, this application provides a technical solution in which a battery cell group is arranged between a first beam and a second beam spaced apart. At least one of the first beam and the second beam serves as a locking beam, and a wedge-shaped gap exists between the locking beam and the battery cell group. A wedge-shaped component fills the wedge-shaped gap to lock the battery cell group to the housing. Therefore, by utilizing the cooperation between the wedge-shaped component and the wedge-shaped gap, the battery cell group can be stably locked to the housing, and the interaction forces between the battery cells create mutual restraint, thereby improving the structural stability of the battery. This can increase the overall rigidity and strength of the battery and reduce the safety risks caused by vibration and shock during battery use.

[0063] The technical solutions described in the embodiments of this application are applicable to various battery-powered devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0064] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use batteries. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0065] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery 10 can be installed inside vehicle 1. The controller 30 controls the battery 10 to supply power to the motor 40. For example, the battery 10 can be installed at the bottom, front, or rear of vehicle 1. The battery 10 can be used to power vehicle 1; for example, it can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery 10 can not only serve as the operating power source for vehicle 1 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to vehicle 1.

[0066] To meet different power demands, battery 10 may include multiple battery cells, which can be connected in series, parallel, or a combination of both. Battery 10 can also be called a battery pack. Optionally, multiple battery cells can first be connected in series, parallel, or a combination of both to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination of both to form a battery. That is, multiple battery cells can be directly assembled into battery 10, or they can first be assembled into battery modules, and then the battery modules can be assembled into battery 10.

[0067] For example, such as Figure 2 The diagram shown is a structural schematic of a battery 10 according to an embodiment of this application. The battery 10 may include multiple battery cells 20. The battery 10 may also include a housing (or cover) 11, the housing 11 having a hollow interior, and the multiple battery cells 20 are housed within the housing 11. For example, refer to... Figure 2The housing 11 may include two parts, referred to here as the first part 111 and the second part 112. The first part 111 and the second part 112 are fastened together to form a receiving space for accommodating multiple battery cells 20. The shapes of the first part 111 and the second part 112 can be determined according to the combined shape of the multiple battery cells 20. Both the first part 111 and the second part 112 may have an opening. For example, both the first part 111 and the second part 112 may be hollow cuboids with only one open face. The openings of the first part 111 and the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are fastened together to form a housing 11 with a closed cavity. Multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed inside the housing 11 formed by the fastening of the first part 111 and the second part 112.

[0068] Optionally, in some embodiments, the housing 11 further includes a beam 113 for attaching to at least one of the plurality of battery cells 20 to secure the plurality of battery cells 20. The beam 113 is disposed within the housing 11 and can be fixedly connected to either the first portion 111 or the second portion 112.

[0069] This application does not limit the arrangement of beam 113 within the housing 11. In one example, one side of beam 113 is attached to the side wall of housing 11, and the other side of beam 113 is attached to the battery cell 20. In this case, beam 113 can also be considered as part of the side wall of housing 11. In another example, both sides of beam 113 are attached to battery cells 20 respectively. In this case, beam 113 can be considered as an auxiliary structural component to improve the installation stability of multiple battery cells 20 within housing 11, and beam 113 can also be referred to as a crossbeam.

[0070] In the box 11, the number of beams 113 can be flexibly set according to actual usage requirements, such as 1, 2, 3 or other numbers. When there are multiple beams 113, all of them can be side walls of the box 11, all of them can be crossbeams, or they can be partly side walls of the box 11 and partly crossbeams. This application does not limit this.

[0071] In this embodiment of the application, there are many ways to install multiple battery cells 20 inside the housing 11, and examples are given below.

[0072] Alternatively, in one embodiment, multiple battery cells 20 can be first integrated into at least one battery module, and then the battery module can be installed in the housing 11 to form a battery pack. In this embodiment, auxiliary structural components such as crossbeams can also be provided between the battery modules to improve the installation stability of the battery modules in the housing 11.

[0073] Alternatively, in another embodiment, multiple battery cells 20 can be directly interconnected and installed in the housing 11 to form a battery pack. Since the intermediate state of the battery module is eliminated, auxiliary structural components such as crossbeams are unnecessary in the housing 11, thereby reducing the weight of the battery 10 and increasing its energy density. This embodiment can also be referred to in related technologies as cell-to-pack (CTP) installation technology.

[0074] Alternatively, in another embodiment, the housing 11 can be integrated into the electrical device where the battery 10 is located. In other words, the housing 11 can be integrally formed with the structural components in the electrical device. After multiple battery cells 20 are interconnected, they can be directly installed in the housing 11 of the electrical device. As an example, the housing 11 can be integrated into a local area of ​​the chassis of the aforementioned vehicle 1, and after multiple battery cells 20 are interconnected, they can be directly installed in the chassis of the vehicle 1. This embodiment can also be referred to in related technologies as cell-to-chassis (CTC) installation technology.

[0075] Optionally, the battery 10 may also include other structures, which will not be described in detail here. For example, the battery 10 may also include a busbar component for realizing the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing 11 via a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0076] The number of battery cells 20 can be set to any value depending on different power demands. Multiple battery cells 20 can be connected in series, parallel, or mixed to achieve a larger capacity or power.

[0077] like Figure 3 The diagram shown is a structural schematic of a battery cell 20 according to an embodiment of this application. The battery cell 20 may include a battery case 21 and one or more electrode assemblies 22 housed within the battery case 21. In some embodiments, the battery case 21 may also be referred to as a housing.

[0078] refer to Figure 3 The battery box 21 may include a housing 211, a first cover plate 212a, and a second cover plate 212b. The walls of the housing 211, as well as the first cover plate 212a and the second cover plate 212b, are all referred to as the walls of the battery cell 20. The housing 211 is shaped according to the combination of one or more electrode assemblies 22. For example, Figure 3 The housing 211 shown can be a hollow cuboid. At least one face of the housing 211 has an opening so that one or more electrode assemblies 22 can be placed inside the housing 211. For example, in Figure 3 In the illustrated embodiment, two opposite sides of the housing 211 have openings. A first cover plate 212a and a second cover plate 212b respectively cover the openings on these two sides and are connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0079] Optionally, in one embodiment, the first cover plate 212a and the second cover plate 212b may be formed independently and then connected to the housing 211 to cover the opening. Alternatively, in another embodiment, one of the first cover plate 212a and the second cover plate 212b may be integrally formed with the housing 211, while the other may be formed independently and then connected to the housing 211 to cover the opening.

[0080] The battery cell 20 may also include two electrode terminals 214. Optionally, as... Figure 3 As shown, the two electrode terminals 214 can be respectively disposed on the first cover plate 212a and the second cover plate 212b. Alternatively, in some other embodiments, the two electrode terminals 214 can also be disposed on the same cover plate, for example, both disposed on the first cover plate 212a or the second cover plate 212b.

[0081] The first cover plate 212a and the second cover plate 212b are typically flat. Two electrode terminals 214 can be fixed to the flat surfaces of the first cover plate 212a and the second cover plate 212b, respectively. The two electrode terminals 214 are a positive electrode terminal and a negative electrode terminal, respectively. Each electrode terminal 214 is provided with a corresponding connecting member (not shown in the figure), or it can also be called a current collector, which is located between the first cover plate 212a and the electrode assembly 22 and between the second cover plate 212b and the electrode assembly 22. The connecting member is used to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0082] Optionally, such as Figure 3As shown, the battery cell 20 may further include a first bracket 216a and a second bracket (not shown in the figure). The first bracket 216a is disposed between the electrode assembly 22 and the first cover plate 212a, and is used to fix and connect the first cover plate 212a. Correspondingly, the second bracket is disposed between the electrode assembly 22 and the second cover plate 212b, and is used to fix and connect the second cover plate 212b. Optionally, the connecting member connecting the electrode assembly 22 and the electrode terminal 214 may be located in the first bracket 216a and the second bracket, respectively.

[0083] Additionally, in the battery cell 20, each electrode assembly 22 has a first tab 221 and a second tab (not shown in the figure). The first tab 221 and the second tab have opposite polarities. For example, when the first tab 221 is the positive tab, the second tab is the negative tab. The first tab 221 of one or more electrode assemblies 22 is connected to an electrode terminal via a connecting member, and the second tab of one or more electrode assemblies 22 is connected to another electrode terminal via another connecting member. For example, as... Figure 3 As shown, the electrode terminal 214 located on the first cover plate 212a can be connected to the first tab 221 via a connecting member located on the first bracket 216a. Additionally, the other electrode terminal 214 located on the second cover plate 212b can be connected to the second tab via another connecting member located on the second bracket.

[0084] In the battery cell 20, the number of electrode components 22 can be flexibly set according to actual usage requirements, such as 1, 2, 4 or other numbers.

[0085] As an example, a pressure relief mechanism 213 may also be provided on one wall of the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0086] Optionally, in another embodiment of this application, the pressure relief mechanism 213 and the electrode terminals 214 (positive electrode terminals and / or negative electrode terminals) are disposed on the same wall of the battery cell 20. As an example, such as... Figure 3 As shown, both the electrode terminal 214 and the pressure relief mechanism 213 can be disposed on the second cover plate 212b of the battery cell 20.

[0087] By placing the pressure relief mechanism 213 and the electrode terminal 214 on the same wall of the battery cell 20, it is convenient to process and install the pressure relief mechanism 213 and the electrode terminal 214, which is beneficial to improving the production efficiency of the battery 10.

[0088] Of course, in other embodiments of this application, the pressure relief mechanism 213 may also be disposed on different walls of the battery cell 20 along with the electrode terminals 214. For example, the two electrode terminals 214 in the battery 10 may be disposed on the first cover plate 212a and the second cover plate 212b of the battery cell 20, respectively, while the pressure relief mechanism 213 may be disposed on other walls of the battery 10 other than the first cover plate 212a and the second cover plate 212b, such as in the housing 211. Alternatively, both electrode terminals 214 in the battery 10 may be disposed on the first cover plate 212a of the battery cell 20, and the pressure relief mechanism 213 may be disposed on the second cover plate 212b of the battery cell 20.

[0089] By placing the pressure relief mechanism 213 and the electrode terminal 214 on different walls of the battery cell 20, the discharge from the battery cell 20 can be further away from the electrode terminal 214 when the pressure relief mechanism 213 is actuated, thereby reducing the impact of the discharge on the electrode terminal 214 and the busbar component, thus enhancing the safety of the battery.

[0090] The aforementioned pressure relief mechanism 213 can be part of the wall it is located on, or it can be a separate structure from the wall it is located on, fixed to the wall by means such as welding. For example, in Figure 3 In the illustrated embodiment, when the pressure relief mechanism 213 is part of the second cover plate 212b, the pressure relief mechanism 213 can be formed by setting a groove on the second cover plate 212b. The thickness of the second cover plate 212b corresponding to the groove is less than the thickness of the pressure relief mechanism 213 in other areas except for the groove. The groove is the weakest point of the pressure relief mechanism 213. When too much gas is generated by the battery cell 20, causing the internal pressure of the casing 211 to rise and reach a threshold, or when the internal reaction of the battery cell 20 generates heat, causing the internal temperature of the battery cell 20 to rise and reach a threshold, the pressure relief mechanism 213 can rupture at the groove, resulting in communication between the inside and outside of the casing 211. The gas pressure and temperature are released outward through the rupture of the pressure relief mechanism 213, thereby reducing the possibility of the battery cell 20 exploding.

[0091] Furthermore, the pressure relief mechanism 213 can be any of the possible pressure relief mechanisms, and this application embodiment is not limited to any particular one. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0092] Optionally, such as Figure 3As shown, the battery cell 20 may further include a first protective layer 215a and a second protective layer 215b. The first protective layer 215a and the second protective layer 215b respectively cover the first cover plate 212a and the second cover plate 212b to protect the components on the two cover plates. Optionally, when the first cover plate 212a and the second cover plate 212b are metal cover plates, the first protective layer 215a and the second protective layer 215b can be insulating layers to achieve insulation between the metal cover plate and the outside. Additionally, from... Figure 3 It can be seen that openings adapted to the electrode terminal 214 and the pressure relief mechanism 213 can be formed on the first protective layer 215a and the second protective layer 215b, so that the electrode terminal 214 can be connected to the busbar through the opening, and the pressure relief mechanism 213 can release the internal air pressure of the battery cell 20 through the opening.

[0093] Figure 4 A schematic structural diagram of a battery according to an embodiment of this application is shown, wherein... Figure 4 (a) in the diagram is a schematic diagram of battery assembly. Figure 4 (b) in the diagram is a partial exploded view of the battery. For ease of understanding, Figure 5 It also shows Figure 4 A schematic partial 3D view of the battery.

[0094] refer to Figure 4 and Figure 5 The battery 10 includes a battery cell pack 2 and a housing 11, the housing 11 for housing the battery cell pack 2. The battery cell pack 2 includes a plurality of battery cells 20 arranged along a first direction. The housing 11 includes a first beam 101 and a second beam 102 spaced apart along the first direction, the battery cell pack 2 being disposed between the first beam 101 and the second beam 102, wherein at least one of the first beam 101 and the second beam 102 is a locking beam, and a wedge-shaped gap 12 is formed between the locking beam and the battery cell pack 2. The battery 10 also includes a wedge-shaped component 13 for filling the wedge-shaped gap 12 to lock the battery cell pack 2 to the housing 11.

[0095] Optionally, in this embodiment, the internal structure of the battery cell 20 can be found above. Figure 3 The relevant description of the illustrated embodiment. To facilitate the installation of the battery cell 20 in the housing 11 and improve the installation stability of the battery cell 20, the battery cell 20 may have a polyhedral structure. For example, the battery cell 20 may have a hexahedral structure.

[0096] Optionally, in this embodiment of the application, the housing 11 may be as described above. Figure 2The enclosure 11 in the illustrated embodiment. For ease of installation in electrical devices, and as an example rather than a limitation, the enclosure 11 may be a hollow hexahedral structure. In this embodiment, the first beam 101 and the second beam 102 are part of the enclosure 11. During actual assembly, at least when the battery cell group 2 is placed between the first beam 101 and the second beam 102, the positional relationship between the first beam 101 and the second beam 102 is relatively fixed. After assembly, the position of the first beam 101 within the enclosure 11 is relatively fixed, and the position of the second beam 102 within the enclosure 11 is relatively fixed.

[0097] In this embodiment, the first beam 101 and / or the second beam 102 are locking beams, wherein a wedge-shaped gap 12 is formed between the locking beam and the battery cell assembly 2. Specifically, the wedge-shaped gap 12 is formed by the surfaces of the locking beam facing the battery cell assembly 2 and the surfaces of the battery cell assembly 2 facing the locking beam being inclined relative to each other; or, the wedge-shaped gap 12 is formed by the surfaces of the locking beam facing the battery cell assembly 2 and the surfaces of the battery cell assembly 2 facing the locking beam gradually converging. The distance between the surfaces of the locking beam facing the battery cell assembly 2 and the surfaces of the battery cell assembly 2 facing the locking beam (i.e., the distance between them in the first direction) is in a certain direction (e.g., a direction perpendicular to the first direction, such as...). Figure 4 The Z direction (as shown) gradually increases. In other words, the plane containing the surface of the locking beam facing the battery cell group 2 and the plane containing the surface of the battery cell group 2 facing the locking beam are in a certain direction (e.g., a direction perpendicular to the first direction, such as...). Figure 4 The two beams (in the Z direction shown) intersect and then move away from each other. Here, the distance between the face of the locking beam facing the battery cell group 2 and the face of the battery cell group 2 facing the locking beam can be considered as the distance between the corresponding points of the locking beam and the battery cell group 2 in the first direction.

[0098] It should be noted that, in the embodiments of this application, the first direction may include a positive direction and a negative direction. For example, the positive direction of the first direction may be as follows: Figure 4 The direction indicated by the middle arrow is X, and the negative direction of the first direction is opposite to the positive direction of the first direction, that is, the negative direction of the first direction is... Figure 4 The direction X indicated by the middle arrow is opposite, representing the opposite direction of direction X. As an example and not a limitation, this first direction can be perpendicular to the direction of gravity.

[0099] It should also be noted that, in this embodiment, the battery cell assembly 2 may also include other components, such as auxiliary fasteners (e.g., end plates). Therefore, the aforementioned "face of the battery cell assembly 2 facing the locking beam" refers to the face of the battery cell assembly 2 as a whole that is closest to the locking beam and faces the locking beam. For example, if the battery cell included in the battery cell assembly 2 is adjacent to the locking beam, then the face of the battery cell assembly 2 facing the locking beam refers to the face of the battery cell closest to the locking beam facing the locking beam. Furthermore, the battery cell assembly 2 may also include other components, such as end plates located on both sides of the plurality of battery cells 20. In this case, the face of the battery cell assembly 2 facing the locking beam refers to the face of the end plate closest to the locking beam facing the locking beam.

[0100] It should be understood that the "face of the locking beam facing the battery cell group 2" mentioned above refers to part or all of the face. For ease of description, Figure 4 In the following embodiments, the surface of the battery cell pack 2 facing the locking beam is referred to as the first locking surface 10a, and the surface of the locking beam facing the battery cell pack 2 is referred to as the second locking surface 10b.

[0101] In this embodiment, the wedge-shaped component 13 is a component with one end larger than the other, or one end thicker than the other. The wedge-shaped component 13 is adapted to the shape of the wedge-shaped gap 12 and is used to fill part or all of the wedge-shaped gap 12 to fix the battery cell assembly 2. Specifically, the surface of the wedge-shaped component 13 facing the battery cell assembly 2 gradually converges with the surface of the wedge-shaped component 13 facing the locking beam.

[0102] Based on the technical solution of the embodiments of this application, a battery cell group 2 is provided between a first beam 101 and a second beam 102 that are spaced apart. At least one of the first beam 101 and the second beam 102 serves as a locking beam. A wedge-shaped gap 12 is provided between the locking beam and the battery cell group 2. A wedge-shaped component 13 can fill the wedge-shaped gap 12 to lock the battery cell group 2 to the housing 11.

[0103] In this embodiment, the wedge-shaped component 13 and the wedge-shaped gap 12 work together to reliably and stably lock the battery cell assembly 2 to the housing 11. Furthermore, the interaction force between the battery cells due to compression causes adjacent cells to restrain each other, improving the structural stability of the battery, thereby increasing the overall rigidity and strength of the battery and reducing the safety risks caused by vibration and impact during use.

[0104] Furthermore, the first beam 101 and / or the second beam 102 have a wedge-shaped gap 12 between them and the battery cell assembly 2, which facilitates the placement of the battery cell assembly 2 into the housing 11, reducing the difficulty of installation. The wedge-shaped gap 12 supports both a method of assembling multiple battery cells 20 into a module before placing them into the housing, and a method of placing the battery cells 20 into the housing first and then securing them. After the battery cell assembly 2 is placed into the housing, the wedge-shaped component 13 fills the wedge-shaped gap 12 to lock the battery cell assembly 2 in place, thus improving assembly efficiency.

[0105] Furthermore, in this embodiment, a wedge-shaped component 13 is used to lock the battery cell pack 2 to the housing 11. Therefore, bolt holes with axes perpendicular to the first direction are not required on the auxiliary fixing components (such as end plates). This reduces the thickness of the auxiliary fixing components (such as end plates) in the first direction, thereby reducing the space occupied by the auxiliary fixing components and improving the space utilization rate inside the battery. Furthermore, it can also improve the energy density of the battery.

[0106] Optionally, in some embodiments, the wedge-shaped component 13 is fixed to the locking beam. That is, the wedge-shaped component 13 can be fixedly connected to the locking beam. For example, the wedge-shaped component 13 can be connected to the locking beam by means of bonding, welding or riveting, or it can be connected to the locking beam by means of threaded connection, pin connection, etc. The embodiments of this application do not limit this.

[0107] refer to Figure 4 As an example and not a limitation, if both the first beam 101 and the second beam 102 are locking beams, then there is a wedge-shaped gap 12 between the first beam 101 and the battery cell group 2, and there is also a wedge-shaped gap 12 between the second beam 102 and the battery cell group 2. For ease of description, the wedge-shaped gap between the first beam 101 and the battery cell group 2 is referred to as the first wedge-shaped gap, and the wedge-shaped gap between the second beam 102 and the battery cell group 2 is referred to as the second wedge-shaped gap. Accordingly, the wedge-shaped component used to fill the first wedge-shaped gap can be referred to as the first wedge-shaped component 131, and the wedge-shaped component used to fill the second wedge-shaped gap can be referred to as the second wedge-shaped component 132. In the above embodiment, the wedge-shaped component 13 is fixed to the locking beam, specifically, the first wedge-shaped component 131 is fixed to the first beam 101, and the second wedge-shaped component 132 is fixed to the second beam 102. In other words, the wedge-shaped component 13 is fixed to the locking beam that is closest to or adjacent to it.

[0108] In this embodiment, when the wedge-shaped component 13 is fixed to the locking beam, there is no relative movement between the wedge-shaped component 13 and the locking beam, and the positions of each component in the housing 11 are also relatively fixed. This can improve the installation stability of the battery cell pack 2 in the housing 11, thereby improving the overall rigidity and strength of the battery.

[0109] Alternatively, in other embodiments, the wedge-shaped component 13 may not be fixedly connected to the locking beam, but rather its relative fixation may be achieved solely through the engagement with the wedge gap. For example, the surface roughness of the wedge-shaped component 13 can be increased to increase the friction between the wedge-shaped component 13 and the locking beam and the battery cell group 2, thereby preventing relative movement between the wedge-shaped component 13 and the locking beam and the battery cell group 2, thus achieving stable locking of the battery cell group 2. In this approach, no additional processing of the wedge-shaped component 13 is required, simplifying the assembly steps and improving battery assembly efficiency.

[0110] As mentioned above, the wedge-shaped gap 12 is formed by the gradual convergence of the surface of the locking beam facing the battery cell group 2 (i.e., the second locking surface 10b) and the surface of the battery cell group 2 facing the locking beam (i.e., the first locking surface 10a). In this embodiment, the wedge-shaped gap 12 can be implemented in various ways, which will be described in detail below with reference to the accompanying drawings.

[0111] As an example, the surface of the locking beam facing the battery cell pack 2 is inclined away from the battery cell pack 2 relative to the first direction. For example, refer to Figure 4 That is, the second locking surface 10b is inclined relative to the first direction towards the side away from the battery cell group 2. In this way, the engagement between the locking beam and the battery cell group 2 can form a wedge-shaped gap 12.

[0112] For ease of understanding, let's take the example where both the first beam 101 and the second beam 102 are locked beams. Figure 4 As shown, the surface of the first beam 101 facing the battery cell group 2 is inclined to the direction X shown in the figure relative to the first direction, and the surface of the second beam 102 facing the battery cell group 2 is inclined to the opposite direction X relative to the first direction. Figure 4 As can be seen, the angle between the face of the first beam 101 facing the battery cell group 2 and direction X is an acute angle, and the angle between the face of the second beam 102 facing the battery cell group 2 and the opposite direction of direction X is an acute angle.

[0113] Optionally, the acute angle formed by the second locking surface 10b and the first direction is [30°, 90°), for example, [45°, 85°], or [60°, 75°].

[0114] As another example, the surface of the battery cell pack 2 facing the locking beam is inclined relative to the first direction towards the side away from the locking beam. For example, see reference. Figure 6 That is, the first locking surface 10a is inclined away from the locking beam relative to the first direction. In this way, the battery cell pack 2 and the locking beam can form a wedge-shaped gap 12.

[0115] For ease of understanding, let's take the example where both the first beam 101 and the second beam 102 are locked beams. Figure 5 As shown, the surface of the battery cell pack 2 facing the first beam 101 is inclined to the opposite direction of the first direction (X) shown in the figure, and the surface of the battery cell pack 2 facing the second beam 102 is inclined to the opposite direction of the first direction (X). Figure 5 As can be seen, the angle between the face of the battery cell group 2 facing the first beam 101 and the opposite direction of direction X is an acute angle, and the angle between the face of the battery cell group 2 facing the second beam 102 and direction X is an acute angle.

[0116] Optionally, the acute angle formed by the first locking surface 10a and the first direction is [30°, 90°), for example, [45°, 85°], or [60°, 75°].

[0117] As yet another example, it can be combined with Figure 4 and Figure 6 In one embodiment, the surface of the locking beam facing the battery cell group 2 is inclined relative to the first direction towards the side away from the battery cell group 2, and the surface of the battery cell group 2 facing the locking beam is also inclined relative to the first direction towards the side away from the locking beam. For example, refer to... Figure 7 The second locking surface 10b is inclined relative to the first direction toward the side away from the battery cell group 2, and the first locking surface 10a is inclined relative to the first direction toward the side away from the locking beam, which can form a wedge-shaped gap 12.

[0118] As another example, the surface of the locking beam facing the battery cell group 2 is inclined away from the battery cell group 2 relative to the first direction, and the surface of the battery cell group 2 facing the locking beam is inclined closer to the locking beam relative to the first direction, wherein the degree of inclination of the surface of the locking beam facing the battery cell group 2 is greater than the degree of inclination of the surface of the battery cell group 2 facing the locking beam. For example, refer to... Figure 8 That is, the second locking surface 10b is inclined relative to the first direction towards the side away from the battery cell pack 2, while the first locking surface 10a is inclined relative to the first direction towards the side closer to the locking beam. The inclination degree of the second locking surface 10b is greater than that of the first locking surface 10a. In other words, the acute angle formed by the second locking surface 10b and the first direction is smaller than the acute angle formed by the first locking surface 10a and the first direction. In this way, the first locking surface 10a and the second locking surface 10b tend to gradually converge, forming a wedge-shaped gap 12.

[0119] Of course, in some other embodiments, the first locking surface 10a may be inclined away from the locking beam relative to the first direction, and the second locking surface 10b may be inclined towards the battery cell group 2 relative to the first direction, wherein the inclination of the first locking surface 10a is greater than the inclination of the second locking surface 10b. That is, the acute angle formed by the first locking surface 10a and the first direction is smaller than the acute angle formed by the second locking surface 10b and the first direction, thus forming a wedge-shaped gap 12 between the locking beam and the battery cell group 2.

[0120] In this embodiment, a wedge-shaped gap 12 is formed between the locking beam and the battery cell group 2. The wedge-shaped component 13 can be inserted into the wedge-shaped gap 12 from the end with the largest gap between the locking beam and the battery cell group 2 to achieve locking and positioning of the battery cell group 2.

[0121] When the first beam 101 or the second beam 102 is a locking beam, a wedge-shaped component 13 (e.g., the first wedge-shaped component 131 or the second wedge-shaped component 132) can be used to lock the battery cell pack 2. The operation is simple and can improve the battery assembly efficiency.

[0122] When both the first beam 101 and the second beam 102 are locking beams, the battery cell group 2 can be locked by the cooperation of the first wedge component 131 and the second wedge component 132, which can achieve precise positioning of the battery cell group 2 in the housing 11.

[0123] In this embodiment, when one of the first beam 101 and the second beam 102 is a locking beam, the wedge gap 12 can be formed using any of the above-described implementation methods. When both the first beam 101 and the second beam 102 are locking beams, the method of forming the wedge gap 12 (i.e., the first wedge gap) between the first beam 101 and the battery cell group 2 can be the same as the method of forming the wedge gap 12 (i.e., the second wedge gap) between the second beam 102 and the battery cell group 2, or it can be different (e.g., using any of the above-described implementation methods). This embodiment does not limit this; the following only considers... Figure 7 and Figure 9 An example is provided.

[0124] For example, refer to Figure 7Both the first beam 101 and the second beam 102 are locking beams. The second locking surfaces 10b of both the first beam 101 and the second beam 102 are inclined relative to the first direction, away from the battery cell assembly 2. The first locking surface 10a of the battery cell assembly 2 facing the first beam 101 is inclined relative to the first direction, away from the first beam 101. The first locking surface 10a of the battery cell assembly 2 facing the second beam 102 is inclined relative to the first direction, away from the second beam 102. Thus, a first wedge-shaped gap 121 is formed between the first beam 101 and the battery cell assembly 2, and a second wedge-shaped gap 122 is formed between the second beam 102 and the battery cell assembly 2.

[0125] Thus, in a direction perpendicular to the first direction, both the first wedge gap 121 and the second wedge gap 122 have a larger gap on one side and a smaller gap on the other side. During actual assembly, the first wedge component 131 and the second wedge component 132 are wedgeed into the first wedge gap 121 and the second wedge gap 122 respectively on the same side of the battery cell assembly 2, for example, from along... Figure 7 The wedge is inserted in the opposite direction of Z, which facilitates installation and can improve battery production efficiency.

[0126] For example, refer to Figure 9 Both the first beam 101 and the second beam 102 are locking beams. The first locking surface 10a of the battery cell assembly 2 facing the first beam 101 is inclined towards the side closer to the first beam 101 relative to the first direction. The first locking surface 10a of the battery cell assembly 2 facing the second beam 102 is inclined away from the second beam 102 relative to the first direction. The second locking surfaces 10b of the first beam 101 and the second locking surfaces 10b of the second beam 102 can be parallel to each other. Alternatively, the second locking surface 10b of the first beam 101 is inclined towards the side closer to the battery cell assembly 2 relative to the first direction, and the second locking surface 10b of the second beam 102 is inclined away from the battery cell assembly 2 relative to the first direction. Thus, a first wedge-shaped gap 121 is formed between the first beam 101 and the battery cell assembly 2, and a second wedge-shaped gap 122 is formed between the second beam 102 and the battery cell assembly 2.

[0127] Thus, in a direction perpendicular to the first direction, the larger gap side of the first wedge gap 121 and the smaller gap side of the second wedge gap 121 are on the same side, and the smaller gap side of the first wedge gap 121 and the larger gap side of the second wedge gap 121 are on the same side. In actual assembly, the first wedge component 131 and the second wedge component 132 are wedgeed into the first wedge gap 121 and the second wedge gap 122 from both sides of the battery cell assembly 2, for example, along... Figure 9 The direction Z is shown, wedged into the first wedge-shaped component 131, along... Figure 9The second wedge component 132 is wedged in the opposite direction of direction Z. In this way, different wedge components can be placed in different ways and with different wedging directions, making them suitable for various complex locking scenarios.

[0128] Optionally, in the above embodiments, the included angle between the first locking surface 10a and the second locking surface 10b can be θ (reference). Figure 7 As shown), the value of θ can be (0°, 120°], for example (0°, 90°), or [10°, 45°].

[0129] In this embodiment, the included angle between the first locking surface 10a and the second locking surface 10b is taken as an appropriate value, which can not only achieve effective locking of the battery cell pack 2, but also reduce the processing difficulty of the wedge-shaped component 13.

[0130] Optionally, in some embodiments, the convergence direction of the first locking surface 10a and the second locking surface 10b can be perpendicular to the first direction. For example, the first locking surface 10a and the second locking surface 10b can converge along direction Z or the opposite direction of direction Z, or along direction Y or the opposite direction of direction Y. The convergence direction involved here can be defined as the extension direction of the center plane located between the first locking surface 10a and the second locking surface 10b, or as the extension direction of the first locking surface 10a or the second locking surface 10b. The specific definition can be made according to actual needs, and this application does not impose any special limitations on it.

[0131] Optionally, in other embodiments, the convergence direction of the first locking surface 10a and the second locking surface 10b may be perpendicular to the length direction of the locking beam (e.g., Figure 5 Shown in the direction Y).

[0132] It is understandable that in three-dimensional space, the dimension of the locking beam in its length direction is greater than the dimension of the locking beam in other directions. In other words, the direction in which the locking beam has the largest dimension is its length direction.

[0133] Optionally, in some embodiments, the locking beam can be a trapezoidal beam (see reference). Figure 4 , 7 8) or rectangular beam (reference) Figure 6 , 9 ).

[0134] In this embodiment, the trapezoidal beam can be understood as lying in a plane perpendicular to the length direction of the beam (e.g., ...). Figure 4The beam shown is a trapezoidal beam (e.g., a right trapezoid, an isosceles trapezoid, or a general trapezoid) with a cross-section in the XZ plane. It should be noted that the trapezoid mentioned above refers to the shape of the outer contour of the beam's cross-section. Trapezoids include regular trapezoids and approximate trapezoids, where an approximate trapezoid can be understood as the outer contour of the beam's cross-section being approximately trapezoidal. Corresponding to a beam, this means the main structure of the beam is trapezoidal, that is, the cross-section of the main structure of the beam in a plane perpendicular to the beam's length direction is trapezoidal. However, the beam may also include other auxiliary components extending from the main structure of the beam. In other words, the trapezoidal beams involved in the embodiments of this application include regular trapezoidal beams and beams that are approximate trapezoidal beams obtained by deforming regular trapezoidal beams.

[0135] Similar to trapezoidal beams, in this embodiment, rectangular beams can be understood as beams lying in a plane perpendicular to the length direction of the beam (e.g., ...). Figure 5 The beam shown is a rectangular beam with a rectangular cross-section in the XZ plane. It should be noted that the rectangle mentioned above refers to the shape of the outer contour of the beam's cross-section. The rectangular beams involved in the embodiments of this application include regular rectangular beams and beams obtained by deformation based on regular rectangular beams (for example, the main structure of the beam is rectangular, but the beam may also include other auxiliary components extending from the main structure of the beam).

[0136] Optionally, in some embodiments, reference is made to Figure 4 and Figure 5 The battery cells 20 included in the battery cell pack 2 can be square battery cells. For example, square battery cells can form a square battery cell pack 2, and the square battery cell pack 2 can cooperate with a trapezoidal beam to form a wedge-shaped gap 12, wherein the second locking surface 10b of the trapezoidal beam is inclined away from the battery cell pack 2 relative to the first direction.

[0137] Alternatively, in other embodiments, reference is made to Figure 7 The battery cell group 2 includes battery cells 20 with a polyhedral structure. Each battery cell 20 includes a first wall 201 and a second wall 202 that are interconnected. The first wall 201 is parallel to a first direction, and the second wall 202 is inclined relative to the first wall 201. Multiple battery cells 20 can be stacked along the first direction to form the battery cell group 2, wherein adjacent battery cells 20 can be attached to each other through the second wall 202. For example... Figure 6-9 As shown, the second wall 202 of the battery cell 20 near the locking beam can cooperate with the rectangular beam or trapezoidal beam to form a wedge-shaped gap 12.

[0138] In this embodiment, the second wall 202 of the battery cell 20 is inclined relative to the first wall 201, and two adjacent battery cells in the first direction are attached to each other through their respective second walls 202. Therefore, an interaction force is formed between the adjacent second walls 202, such that at least one inclined second wall 202 of each battery cell is pressed down by the inclined second wall 202 of the adjacent battery cell. The interaction force between the adjacent battery cells binds and restricts each other, which can improve the overall rigidity and strength of the battery and reduce the safety risks caused by vibration and shock during battery use.

[0139] Figure 10 A schematic diagram of the structure of a battery cell provided in an embodiment of this application is shown.

[0140] In one example, such as Figure 10 As shown in (a), the battery cell 20 may include two first walls 201 arranged in parallel and two second walls 202 arranged in non-parallel, and the cross section of the battery cell 20 on the plane perpendicular to the first wall 201 and the second wall 202 is trapezoidal.

[0141] In this way, when multiple battery cells 20 are stacked along the first direction, the connection between multiple battery cells can be achieved more conveniently, thereby improving the production efficiency of the battery.

[0142] In another example, such as Figure 10 As shown in (b), the battery cell 20 may include two first walls 201 arranged in parallel and two second walls 202 arranged in parallel, and the cross section of the battery cell 20 on the plane perpendicular to the first wall 201 and the second wall 202 is a parallelogram.

[0143] Therefore, when multiple battery cells 20 are stacked along the first direction, the connection between the multiple battery cells can be achieved relatively easily, improving battery production efficiency. Furthermore, the structure of the battery cell 20 is relatively regular and symmetrical, facilitating the manufacturing and installation of the battery cells.

[0144] It is understandable that the battery cell 20 can also be a polyhedral structure of other shapes, such as triangular prism, pentagonal prism, etc. The specific design can be made according to actual needs, and will not be described in detail here.

[0145] The above combination Figures 4 to 10 This application mainly introduces the structure of the battery provided in the embodiments, and describes in detail the wedge-shaped gap 12 involved in this application. The following is in conjunction with... Figures 11 to 14 This paper mainly focuses on the wedge-shaped component 13 involved in this application. For the sake of brevity, the relevant descriptions of other components can be found above. They will not be repeated below.

[0146] Figure 11A partial structural schematic diagram of a battery provided in an embodiment of this application is shown.

[0147] like Figure 11 As shown in (a), the wedge-shaped component 13 includes a first surface 1301 and a second surface 1302 disposed opposite to each other. The first surface 1301 is used to attach to the surface of the battery cell assembly 2 facing the locking beam (i.e., the first locking surface 10a), and the second surface 1302 is used to attach to the surface of the locking beam facing the battery cell assembly (i.e., the second locking surface 10b).

[0148] When the wedge-shaped component 13 fills the wedge-shaped gap 12, as Figure 11 As shown in (b), the first surface 1301 of the wedge-shaped component 13 is opposite to and parallel to the surface of the battery cell assembly 2 facing the locking beam, and the second surface 1302 of the wedge-shaped component 13 is opposite to and parallel to the surface of the locking beam facing the battery cell assembly 2. After the wedge-shaped component 13 is assembled, the first surface 1301 is attached to the first locking surface 10a, and the second surface 1302 is attached to the second locking surface 10b.

[0149] In this embodiment, the first surface 1301 and the second surface 1302 of the wedge-shaped component 13 are parallel and attached to the first locking surface 10a and the second locking surface 10b, respectively. This can increase the contact area between the wedge-shaped component 13 and the battery cell pack 2 and the locking beam, thereby improving the locking ability of the wedge-shaped component 13 to the battery cell pack 2.

[0150] Figure 12 A partial structural schematic diagram of another battery provided in an embodiment of this application is shown. Figure 11 The batteries shown are different, such as Figure 12 As shown in (a), the wedge-shaped component 13 also includes a third surface 1303 connecting the first surface 1301 and the second surface 1302, and a first extension 1304 extending from the third surface 1303 away from the battery cell group 2 in a first direction.

[0151] The first extension 1304 is used to connect with the locking beam.

[0152] After the wedge-shaped component 13 is assembled, as follows Figure 12 As shown in (b), the first surface 1301 is attached to the first locking surface 10a, the second surface 1302 is attached to the second locking surface 10b, and the first extension 1304 is connected to the locking beam.

[0153] Optionally, the first extension 1304 can be connected to the locking beam by means of bonding, welding, riveting, bolting, etc.

[0154] Optionally, in some embodiments, reference is made to Figure 12The locking beam may include a third locking surface 10c connected to the second locking surface 10b, the third locking surface 10c being used to attach to the first extension 1304.

[0155] In this embodiment, the wedge-shaped component 13 is connected to the locking beam via the first extension 1304, so that there is no relative movement between the wedge-shaped component 13 and the locking beam, which can improve the locking ability of the wedge-shaped component 13 to the battery cell pack 2, thereby improving the structural stability inside the battery.

[0156] Figure 13 A partial structural schematic diagram of another battery provided in an embodiment of this application is shown. Figure 11 The batteries shown are different, such as Figure 13 As shown in (a), the wedge-shaped component 13 also includes a third surface 1303 connecting the first surface 1301 and the second surface 1302, and a second extension 1305 extending from the third surface 1303 along a first direction close to the battery cell pack 2.

[0157] Continue to refer to Figure 13 In (a), the battery 10 also includes an end plate 23, which is disposed between the locking beam and the battery cell group 2 and attached to the battery cell group 2. A step 231 is provided on the side of the end plate 23 facing the locking beam. A second extension 1305 is used to cooperate with the step 231 to limit the end plate 23 in a second direction.

[0158] In this embodiment, the second direction is perpendicular to the first direction and perpendicular to the extension direction of the locking beam, and the extension direction of the locking beam is perpendicular to the first direction. In other words, the first direction, the second direction, and the extension direction of the locking beam are three mutually perpendicular directions, such as direction X, direction Z, and direction Y as shown in the figures.

[0159] It should be noted that the extension direction of the locking beam can be considered as its length direction. It can be understood that in three-dimensional space, the dimension of the locking beam in its length direction is greater than its dimensions in other directions. In other words, the direction in which the locking beam has the largest dimension is its length direction, or its extension direction.

[0160] After the wedge-shaped component 13 is assembled, as follows Figure 13 As shown in (b), the first surface 1301 is attached to the first locking surface 10a, the second surface 1302 is attached to the second locking surface 10b, and the second extension 1305 engages with the step 231, thereby limiting the end plate 23 in the second direction. Since the end plate 23 is attached to the battery cell pack 2, the engagement of the second extension 1305 with the step 231 can limit the battery cell pack 2.

[0161] Optionally, in some embodiments, step 231 may include a first step surface 231a and a second step surface 231b connected to each other, the second step surface 231b being perpendicular to the first step surface 231a. The first step surface 231a and the first locking surface 10a face the locking beam, and the second step surface 231b is used to connect the step surface 231a and the first locking surface 10a.

[0162] That is, the end plate 23 may include a first step surface 231a, a second step surface 231b, and a first locking surface 10a. The first step surface 231a and the first locking surface 10a face the locking beam and are connected through the second step surface 231b. The first step surface 231a and the second step surface 231b form a step.

[0163] Optionally, the projection of the first step surface 231a along the first direction does not overlap with the projection of the first locking surface 10a along the first direction. The projection of the second step surface 231b along the second direction is located within the range of the projection of the end plate 23 along the second direction.

[0164] In this embodiment, the wedge-shaped component 13 is engaged with the step 231 on the end plate 23 via the second extension 1305, which can limit the end plate 23 and the battery cell group 2, thereby improving the installation stability of the battery cell group 2 in the housing.

[0165] It should be noted that when an end plate is installed, it is generally attached to the individual battery cells. When there are multiple battery cells, the end plate is located on one side of the group of battery cells as a whole. Therefore, in some embodiments, the end plate can also be considered as part of the battery cell group 2.

[0166] Figure 14 A partial structural schematic diagram of another battery provided in an embodiment of this application is shown. Figure 13 Unlike the battery shown, the wedge-shaped component 13 also includes a first extension 1304 extending from the third surface 1303 along a first direction away from the battery cell group 2, the first extension 1304 being used to connect with the locking beam. Figure 14 The first extension 1304 shown is Figure 12 The first extension 1304 is the same as described above; please refer to the detailed description. Figure 12 For the sake of brevity, the relevant descriptions will not be repeated here.

[0167] Optionally, in some embodiments, the battery 10 may further include a busbar 24 for electrically connecting a plurality of battery cells 20. The busbar 24 is disposed at one end of the battery cell group 2 in a third direction, the third direction being parallel to the extension direction of the locking beam, and the extension direction of the locking beam being perpendicular to the first direction.

[0168] For ease of understanding, Figure 15 It shows Figure 14 A partial 3D schematic diagram of the battery. (See attached image.) Figure 15 As shown, the battery 10 includes a first beam 101 and a second beam 102 spaced apart along a first direction, and a battery cell assembly 2 disposed between the first beam 101 and the second beam 102. The first beam 101 and / or the second beam 102 are locking beams. The battery cell assembly 2 includes a plurality of battery cells 20 stacked along the first direction. End plates 23 are attached to both sides of the plurality of battery cells 20, and the end plates 23 are provided with a flange on the side facing the locking beam. Figure 14 The step 231 is shown. The end plate 23 and the locking beam have the aforementioned wedge-shaped gap 12. The battery 10 also includes a wedge-shaped component 13 for filling the wedge-shaped gap 12 between the end plate 23 and the locking beam. The wedge-shaped component 13 has the following characteristics: Figure 14 The first extension 1304 and the second extension 1305 described herein are used to connect with the locking beam, and the second extension 1305 is used to cooperate with the step 231 on the end plate 23 to limit the end plate 23.

[0169] Alternatively, in one embodiment, Figure 15 The assembly process of the battery shown is as follows:

[0170] Step 1) Assemble multiple battery cells 20 outside the housing 11 to form a battery cell group 2, wherein end plates 23 are attached to both sides of the multiple battery cells 20, and steps 231 are provided on the outer side of the end plates 23.

[0171] Step 2), the battery cell pack 2 is installed into the box 11 and placed between the first beam 101 and the second beam 102, wherein the step 231 on the end plate 23 faces the locking beam (the locking beam is the first beam 101 and / or the second beam 102).

[0172] Step 3) Press the wedge-shaped component 13 into the wedge-shaped gap 12 between the locking beam and the battery cell group 2, wherein the second extension 1305 of the wedge-shaped component 13 engages with the step 231;

[0173] Step 4) Fix the first extension 1304 of the wedge-shaped component 13 to the locking beam, for example, by bolting the first extension 1304 to the locking beam as one piece.

[0174] It should be noted that, Figure 11-14 This explanation uses the first beam 101 as an example of a locking beam, but it should be understood that... Figure 11-14 The described solution also applies to the case where the second beam 102 is a locked beam; for the sake of simplicity, it will not be described in detail.

[0175] Figure 16 A schematic top view of the battery provided in an embodiment of this application is shown to illustrate the placement of the first beam and the second beam.

[0176] Optionally, such as Figure 16 As shown in (a) in some embodiments, the first beam 101 and the second beam 102 are the side walls of the box 11.

[0177] Optionally, such as Figure 16 As shown in (b) in some embodiments, the first beam 101 and the second beam 102 are crossbeams in the box 11.

[0178] Optionally, such as Figure 16 As shown in (c), in some other embodiments, one of the first beam 101 and the second beam 102 is a side wall of the box 11, and the other is a crossbeam located inside the box 11.

[0179] Optionally, when the locking beam (i.e., the first beam 101 and / or the second beam 102) is a crossbeam, the locking beam can be used to separate and fix two battery cell groups, for example, separating a first battery cell group and a second battery cell group. Optionally, the surface of the locking beam facing the first battery cell group can be inclined relative to the first direction away from the first battery cell group, and / or the surface of the first battery cell group facing the locking beam can be inclined relative to the first direction away from the locking beam. The surface of the locking beam facing the second battery cell group can be inclined relative to the first direction away from the second battery cell group, and / or the surface of the second battery cell group facing the locking beam can be inclined relative to the first direction away from the locking beam. Therefore, a wedge-shaped gap can be formed between the first battery cell group and the locking beam, and a wedge-shaped gap can be formed between the second battery cell group and the locking beam. In this way, the first battery cell group and the second battery cell group can be locked together using the same locking beam.

[0180] In this embodiment of the application, the structures of the first beam 101 and the first beam 102 may be the same or different, and no special limitation is made here.

[0181] Optionally, in this embodiment, the first beam 101 and / or the second beam 102 can be a solid beam, a hollow beam, or a perforated beam. When the first beam 101 and / or the second beam 102 are hollow beams or perforated beams, the overall weight of the battery can be reduced.

[0182] The foregoing described the battery cell, battery, and electrical device of the present application embodiments. The following describes the method and apparatus for preparing the battery cell of the present application embodiments, wherein parts not described in detail can be referred to the foregoing embodiments.

[0183] Figure 17 A schematic flowchart of a method 300 for preparing a battery 10 according to an embodiment of this application is shown. Figure 17 As shown, the method 300 may include:

[0184] S310 provides 2 battery cell packs.

[0185] S320, with enclosure 11.

[0186] The battery cell assembly 2 includes a plurality of battery cells 20 arranged along a first direction. The housing 11 includes a first beam 101 and a second beam 102 spaced apart along the first direction. The battery cell assembly 2 is disposed between the first beam 101 and the second beam 102. At least one of the first beam 101 and the second beam 102 is a locking beam, and a wedge-shaped gap 12 is formed between the locking beam and the battery cell assembly 2.

[0187] S330, provides wedge-shaped component 13.

[0188] S340, the wedge-shaped component 13 is filled into the wedge-shaped gap 12 to lock the battery cell pack 2 to the housing 11.

[0189] Figure 18 A schematic block diagram of an apparatus 400 for manufacturing a battery 10 according to one embodiment of this application is shown. Figure 18 As shown, the device 400 may include:

[0190] Provide module 410, which is used for:

[0191] A battery cell pack 2 is provided, the battery cell pack 2 including a plurality of battery cells 20 arranged along a first direction;

[0192] A housing 11 is provided, the housing 11 includes a first beam 101 and a second beam 102 spaced apart along a first direction, and a battery cell group 2 is disposed between the first beam 101 and the second beam 102, wherein at least one of the first beam 101 and the second beam 102 is a locking beam, and a wedge-shaped gap 12 is provided between the locking beam and the battery cell group 2.

[0193] Wedge-shaped component 13 is provided.

[0194] Mounting module 420 is used to fill wedge-shaped part 13 into wedge-shaped gap 12 to lock battery cell pack 2 to housing 11.

[0195] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 (10), characterized in that, include: A battery cell pack (2) includes a plurality of battery cells (20) arranged along a first direction. The housing (11) includes a first beam (101) and a second beam (102) spaced apart along the first direction. The battery cell group (2) is disposed between the first beam (101) and the second beam (102). At least one of the first beam (101) and the second beam (102) is a locking beam. The locking beam has a wedge-shaped gap (12) with the battery cell group (2). A wedge-shaped component (13) is used to fill the wedge-shaped gap (12) to lock the battery cell assembly (2) to the housing (11). The wedge-shaped component (13) includes a first surface (1301) and a second surface (1302) disposed opposite to each other, wherein the first surface (1301) is opposite to and parallel to the surface of the battery cell assembly (2) facing the locking beam, and the second surface (1302) is opposite to and parallel to the surface of the locking beam facing the battery cell assembly (2). The battery (10) also includes: An end plate (23) is disposed between the locking beam and the battery cell group (2) and attached to the battery cell group (2), wherein the end plate (23) is provided with a step (231) on the side facing the locking beam. The wedge-shaped component (13) further includes: A third surface (1303) connecting the first surface (1301) and the second surface (1302); and A second extension (1305) extends from the third surface (1303) along the first direction close to the battery cell assembly (2), the second extension (1305) being used to cooperate with the step (231) to limit the end plate (23) in a second direction, wherein the second direction is perpendicular to the first direction and perpendicular to the extension direction of the locking beam, the extension direction of the locking beam being perpendicular to the first direction.

2. The battery (10) according to claim 1, characterized in that, The wedge-shaped component (13) is fixed to the locking beam.

3. The battery (10) according to claim 1, characterized in that, The surface of the locking beam facing the battery cell group (2) is inclined away from the battery cell group (2) relative to the first direction.

4. The battery (10) according to claim 3, characterized in that, The locking beam is a trapezoidal beam.

5. The battery (10) according to claim 1, characterized in that, The battery cell assembly (2) is inclined toward the side away from the locking beam relative to the first direction.

6. The battery (10) according to claim 3, characterized in that, The angle between the face of the locking beam facing the battery cell group (2) and the face of the battery cell group (2) facing the locking beam is greater than 0° and less than 90°.

7. The battery (10) according to claim 1, characterized in that, The wedge-shaped component (13) also includes: A third surface (1303) connecting the first surface (1301) and the second surface (1302); and A first extension (1304) extends from the third surface (1303) away from the battery cell group (2) along the first direction, wherein the first extension (1304) is connected to the locking beam.

8. The battery (10) according to any one of claims 1 to 7, characterized in that, The battery (10) also includes: A busbar (24) is used to electrically connect the plurality of battery cells (20). The busbar (24) is disposed at one end of the battery cell group (2) in a third direction, which is parallel to the extension direction of the locking beam and the extension direction of the locking beam is perpendicular to the first direction.

9. The battery (10) according to any one of claims 1 to 7, characterized in that, The first beam (101) and the second beam (102) are the side walls of the box (11).

10. An electrical appliance, characterized in that, include: The battery (10) according to any one of claims 1 to 9 is used to provide electrical energy to the electrical device.

11. A method for preparing a battery (10), characterized in that, include: A battery cell pack (2) is provided, the battery cell pack (2) comprising a plurality of battery cells (20) arranged along a first direction. A housing (11) is provided, the housing (11) including a first beam (101) and a second beam (102) spaced apart along the first direction, the battery cell group (2) is disposed between the first beam (101) and the second beam (102), wherein at least one of the first beam (101) and the second beam (102) is a locking beam, and the locking beam has a wedge-shaped gap (12) with the battery cell group (2). Provide wedge-shaped component (13); The wedge-shaped component (13) is filled into the wedge-shaped gap (12) to lock the battery cell assembly (2) to the housing (11). The wedge-shaped component (13) includes a first surface (1301) and a second surface (1302) disposed opposite to each other, wherein the first surface (1301) is opposite to and parallel to the surface of the battery cell assembly (2) facing the locking beam, and the second surface (1302) is opposite to and parallel to the surface of the locking beam facing the battery cell assembly (2). The battery (10) also includes: An end plate (23) is disposed between the locking beam and the battery cell group (2) and attached to the battery cell group (2), wherein the end plate (23) is provided with a step (231) on the side facing the locking beam. The wedge-shaped component (13) further includes: A third surface (1303) connecting the first surface (1301) and the second surface (1302); and A second extension (1305) extends from the third surface (1303) along the first direction close to the battery cell assembly (2), the second extension (1305) being used to cooperate with the step (231) to limit the end plate (23) in a second direction, wherein the second direction is perpendicular to the first direction and perpendicular to the extension direction of the locking beam, the extension direction of the locking beam being perpendicular to the first direction.

12. An apparatus for preparing a battery (10), characterized in that, include: Provide modules for: A battery cell pack (2) is provided, the battery cell pack (2) comprising a plurality of battery cells (20) arranged along a first direction. A housing (11) is provided, the housing (11) including a first beam (101) and a second beam (102) spaced apart along the first direction, the battery cell group (2) is disposed between the first beam (101) and the second beam (102), wherein at least one of the first beam (101) and the second beam (102) is a locking beam, and the locking beam has a wedge-shaped gap (12) with the battery cell group (2). Provide wedge-shaped component (13); Install the module for: The wedge-shaped component (13) is filled into the wedge-shaped gap (12) to lock the battery cell assembly (2) to the housing (11). The wedge-shaped component (13) includes a first surface (1301) and a second surface (1302) disposed opposite to each other, wherein the first surface (1301) is opposite to and parallel to the surface of the battery cell assembly (2) facing the locking beam, and the second surface (1302) is opposite to and parallel to the surface of the locking beam facing the battery cell assembly (2). The battery (10) also includes: An end plate (23) is disposed between the locking beam and the battery cell group (2) and attached to the battery cell group (2), wherein the end plate (23) is provided with a step (231) on the side facing the locking beam. The wedge-shaped component (13) further includes: A third surface (1303) connecting the first surface (1301) and the second surface (1302); and A second extension (1305) extends from the third surface (1303) along the first direction close to the battery cell assembly (2), the second extension (1305) being used to cooperate with the step (231) to limit the end plate (23) in a second direction, wherein the second direction is perpendicular to the first direction and perpendicular to the extension direction of the locking beam, the extension direction of the locking beam being perpendicular to the first direction.

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