End plate assembly, battery module, battery, and electric device

Abstract

The application provides an end plate assembly, a battery module, a battery and an electric device. The end plate assembly comprises a first end plate and a second end plate. The first end plate comprises a first plate body and two edge curl structures located at opposite ends of the first plate body along a first direction. The second end plate is attached to the first plate body, and a side of the second end plate away from the first end plate is used to connect with a battery cell. The edge curl structure extends in the direction from the first end plate to the second end plate, and together with the first plate body forms an accommodation space. At least part of the second end plate is located in the accommodation space and attached to the first plate body. The second end plate is in abutment or gap arrangement with at least one edge curl structure in the first direction, and the first direction intersects the arrangement direction of the first end plate and the second end plate. The application can prolong the service life of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to an endplate assembly, a battery module, a battery, and an electrical device. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery technology, how to extend the lifespan of individual battery cells is a research direction. Summary of the Invention

[0004] This application provides an endplate assembly, a battery module, a battery, and an electrical device that can extend the service life of individual battery cells.

[0005] This application provides an endplate assembly, including a first endplate and a second endplate. The first endplate includes a first plate body and two rolled edge structures located at opposite ends of the first plate body along a first direction. The second endplate is attached to the first plate body, and the side of the second endplate facing away from the first endplate is used for connection with a battery cell. The rolled edge structures extend along the direction from the first endplate to the second endplate and form a receiving space with the first plate body. At least a portion of the second endplate is located in the receiving space and is attached to the first plate body. The second endplate and at least one rolled edge structure are abutted or spaced apart in the first direction, which intersects the arrangement direction of the first and second endplates.

[0006] In the above technical solution, the second end plate can support at least one rolled edge structure in the first direction, reduce the deformation of the rolled edge structure in the first direction, thereby improving the support capacity of the first end plate in the first direction, and further reducing the deformation of the expansion-limiting structure, such as the limiting band, in the arrangement direction of the first end plate and the second end plate, thereby improving the limiting effect of the end plate assembly on the expansion of the battery cell, reducing the deformation of the battery cell, and extending the service life of the battery cell.

[0007] In some embodiments, the second end plate includes a second plate body and a filling structure connected to each other. The second plate body is used to fit onto the battery cell. The filling structure is disposed on the side of the second plate body facing the first end plate. At least a portion of the filling structure is located in the receiving space and fits onto the first plate body. Two rolled edge structures are located on both sides of the filling structure in a first direction. At least one rolled edge structure abuts against or is spaced apart from the filling structure in the first direction.

[0008] In the above technical solution, by setting a second plate body for connecting the battery cells, the filling structure can be set more flexibly, that is, a hollow structure, a solid structure or other structures can be adopted.

[0009] In some embodiments, the two rolled edge structures are respectively abutted against or spaced apart from the filling structure in a first direction.

[0010] In the above technical solution, the filling structure can support the two rolled edge structures in the first direction, further reduce the deformation of the rolled edge structures in the first direction, further improve the support capacity of the first end plate in the first direction, and thereby reduce the deformation of the expansion-limiting structure, such as the limiting band, in the second direction of the battery module, thereby improving the limiting effect of the end plate assembly on the expansion of the battery cell, reducing the deformation of the battery cell, and improving the service life of the battery cell.

[0011] In some embodiments, the second plate body protrudes from opposite ends of the filling structure along the first direction, and two rolled edge structures are attached and connected to opposite ends of the second plate body along the first direction.

[0012] The above technical solution can improve the tightness of the connection between the first end plate and the second end plate.

[0013] In some embodiments, the rolled edge structure includes a first wall, a second wall, and a third wall connected at an angle in sequence along its own bending direction. The first wall, the second wall, and the third wall surround a receiving cavity. The first wall and the third wall are arranged opposite to each other along a second direction. The first wall is connected to the first plate body. The end of the third wall opposite to the second wall abuts against or has a gap with the filling structure. The second direction is parallel to the arrangement direction of the first end plate and the second end plate.

[0014] In the above technical solution, the presence of the receiving cavity allows the rolled edge structure to have better support in the second direction, reducing the deformation of the rolled edge structure in the second direction after being subjected to force, and providing good protection for the battery cell. Furthermore, when a limiting band is used to restrict the expansion of the battery cell, the rolled edge structure can support and tension the limiting band in the second direction, improving the limiting band's effect on restricting the expansion of the battery cell and reducing the deformation of the battery cell.

[0015] In some embodiments, the second plate body protrudes from opposite ends of the filling structure along the first direction, and the third wall body is attached to and connected to the second plate body.

[0016] In the above technical solution, this configuration can improve the tightness of the connection between the first end plate and the second end plate.

[0017] In some embodiments, at least a portion of the first wall body protrudes from the first plate body in the direction from the second end plate to the first end plate.

[0018] In the above technical solution, when the limiting band is used in conjunction with the end plate assembly, this setting can reduce the local pressure brought by the limiting band on the first plate body in the second direction when the battery cell expands. The pressure is evenly transmitted to the first plate body through the rolled edge structure, thereby further improving the uniformity of the force on the first plate body, reducing the deformation of the first plate body, and thus improving the limiting effect of the first end plate on the expansion of the battery cell and reducing the deformation of the battery cell.

[0019] In some embodiments, at least a portion of the second wall protrudes from the second end plate along a first direction.

[0020] In the above technical solution, when the limiting band is used in conjunction with the end plate assembly, since at least part of the second wall protrudes from the second end plate in the first direction, the supporting effect of the second wall in the second direction is further improved, the pressure exerted by the limiting band on the side area of ​​the module body is reduced, thereby forming a protective effect on the battery cell, and at the same time, the limiting band is further tightened, thereby improving the limiting effect of the end plate assembly on the expansion of the battery cell.

[0021] In some embodiments, the first wall and the second wall transition smoothly.

[0022] In the above technical solution, the first wall and the second wall are set to a smooth transition, so that the limiting band contacts a smooth curved surface, which can reduce damage to the limiting band.

[0023] In some embodiments, the rolled edge structure further includes at least one fourth wall, which is connected at an angle to at least one end of the third wall in the third direction. The fourth wall covers at least a portion of the receiving cavity and has a first through hole through which the target connector passes. The third direction, the first direction, and the second direction intersect each other.

[0024] In the above technical solution, a fourth wall is provided. At the end where the fourth wall is provided, there is no need to provide other transition connecting components on the rolled edge structure. This improves the problem of weak intermediate mechanical properties caused by the addition of transition connecting components. The target connector can directly pass through the fourth wall, which is more convenient to use.

[0025] In some embodiments, there are two fourth walls, which are connected to the opposite ends of the third wall in the third direction, and the two first through holes are aligned along the third direction.

[0026] In the above technical solution, by setting two fourth walls, there is no need to place other structures on the rolled edge structure, which further improves the problem of weak intermediate mechanical properties caused by the addition of transition connecting components. The target connector can be locked to the box by directly passing through the two fourth walls, which is more convenient to use.

[0027] In some embodiments, the projection of the fourth wall onto the first wall along a third direction covers at least a portion of the first wall and abuts against or has a gap with the end of the first wall.

[0028] In the above technical solution, with this configuration, when the target connector is locked, the first wall can provide support for the fourth wall, thereby reducing the deformation of the fourth wall and improving the tightness of the locking between the end plate assembly and the housing.

[0029] In some embodiments, the endplate assembly further includes a support member, at least a portion of which is located in the receiving cavity and connected to the first wall and the third wall.

[0030] In the above technical solution, when the limiting band is used in conjunction with the end plate assembly, the support member is supported between the first wall and the third wall. Therefore, the support capacity of the rolled edge structure in the second direction can be improved, the deformation of the rolled edge structure in the second direction after being subjected to force can be reduced, thereby improving the tensioning capacity of the rolled edge structure on the limiting band and improving the limiting effect of the end plate assembly on the expansion of the battery cell.

[0031] In some embodiments, the support member includes a support body and protrusions disposed on opposite sides of the support body along a second direction. Both the first wall and the third wall are provided with second through holes, and the protrusions and the second through holes are inserted into each other.

[0032] In the above technical solution, the support component and the rolled edge structure are connected by a plug-in joint, which facilitates installation and disassembly.

[0033] In some embodiments, when the rolled edge structure includes a fourth wall, the fourth wall protrudes from the first wall along the direction from the second end plate to the first end plate. The plurality of protrusions provided on the support body include a first protrusion. The first protrusion is inserted into and protrudes from the first wall. The first protrusion and the fourth wall are spaced apart and a limiting space for limiting the limiting band is formed between them.

[0034] In the above technical solution, the first protrusion and the fourth wall can form a limiting effect on the limiting band, reducing the possibility of the limiting band falling off.

[0035] In some embodiments, the side of the second plate body opposite to the filling structure is a plane.

[0036] In the above technical solution, the side of the second plate body away from the filling structure is set as a plane, and the plane fits more closely with the surface of the battery cell, and the connection is more secure.

[0037] In some embodiments, the filling structure includes a plurality of staggered reinforcing ribs, which together with the second plate body form a plurality of grooves with openings facing the first end plate.

[0038] In the above technical solution, the filling structure is set as a structure in which multiple reinforcing ribs intersect each other, and multiple grooves are formed around the second plate body, which can reduce the weight of the second end plate and achieve lightweight design.

[0039] In some embodiments, the filling structure is a solid structure.

[0040] In the above technical solution, by setting the filling structure as a solid structure, the end plate assembly can transmit the pressure that suppresses expansion to the battery cells more evenly, reduce the local stress of the battery cells, and improve the uniformity of the force on the battery cells.

[0041] In some embodiments, the first plate body has two opposite ends in a third direction, and a rolled edge structure extends from one end of the first plate body to the other end, with the first direction and the third direction intersecting.

[0042] In the above technical solution, extending the rolled edge structure from one end of the first plate body to the other end not only improves the flexibility of the positioning of the limiting band, but also allows the pressure on the rolled edge structure to be directly transmitted to more areas of the first plate body, thereby improving the limiting effect of the first plate body on the expansion of the battery cells.

[0043] In some embodiments, the first plate body includes a substrate and a first protrusion, the first protrusion protruding from the substrate along the direction from the second end plate to the first end plate, a recessed space being formed on the side of the first protrusion facing the second end plate, and the second end plate being attached to the substrate and the first protrusion.

[0044] In the above technical solution, the second end plate of this application embodiment transmits the expansion force to the first end plate after being subjected to the expansion force of the battery cell. The first end plate, together with other deformation-limiting structures such as limiting bands, restricts the expansion of the battery cell via the second end plate. Since the first end plate has a first protrusion, it has good bending resistance and is not easy to bend. Therefore, it is not easy to deform compared with a flat plate structure. Thus, when the battery cell expands, it can effectively limit the deformation of the battery cell, thereby reducing the degree of deformation after the battery cell expands and extending the service life of the battery cell.

[0045] In some embodiments, there are multiple first protrusions, which are spaced apart along a third direction and extend along a first direction. The third direction and the second direction intersect the first direction in pairs, and the second direction is parallel to the arrangement direction of the first end plate and the second end plate.

[0046] In the above technical solution, multiple first protrusions are spaced apart along a third direction and extend along a first direction. The substrate also extends along the first direction. In this way, for battery cells arranged with their top and bottom ends along the third direction, the expansion of the battery cells can be effectively limited. Specifically, experiments have shown that the middle region of the battery cell along the first direction is prone to expansion. Therefore, setting the first protrusions and the substrate to extend along the first direction can better limit the expansion of the battery cells.

[0047] In some embodiments, one of the first end plate and the second end plate is provided with a limiting protrusion, and the other is provided with a limiting hole, and the limiting protrusion and the limiting hole are inserted into each other.

[0048] In the above technical solution, the limiting protrusion and limiting hole can play a limiting role during the assembly of the first end plate and the second end plate and during subsequent use, thereby reducing the relative displacement of the first end plate and the second end plate.

[0049] In some embodiments, the second plate body is an insulating element.

[0050] In the above technical solution, setting the second plate body as an insulating component can increase the insulation performance between the end plate assembly and the battery cell, thereby improving the reliability of the battery module.

[0051] Secondly, embodiments of this application also provide a battery module, including the aforementioned end plate assembly and module body. The module body includes multiple battery cells, which are arranged sequentially along a second direction. The end plate assembly is disposed at at least one end of the module body in the second direction, which is parallel to the arrangement direction of the first end plate and the second end plate.

[0052] In some embodiments, the battery module further includes a limiting band that fits the module body and the end plate assembly together.

[0053] In the above technical solution, a limiting band is used to fit the module body and the end plate assembly together. This band has strong tensile strength, effectively limiting the expansion of individual battery cells, and has low manufacturing costs. Furthermore, the limiting band is connected to the end plate assembly and the module body via a sleeve connection, simplifying the installation process and increasing production efficiency.

[0054] Thirdly, embodiments of this application also provide a battery, including the battery module described above.

[0055] Fourthly, embodiments of this application also provide an electrical device, including the battery described above, which is used to provide electrical energy. Attached Figure Description

[0056] 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.

[0057] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0058] Figure 2 This application provides schematic diagrams of the battery structure for some embodiments.

[0059] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application;

[0060] Figure 4 This is a schematic diagram of one structure of an end cap assembly provided in some embodiments of this application;

[0061] Figure 5 for Figure 4 The diagram shows an exploded view of the end cap assembly.

[0062] Figure 6 for Figure 5 A schematic diagram of the structure of the first end plate of the end cap assembly shown;

[0063] Figure 7 for Figure 5 A schematic diagram of the structure of the second end plate of the end cap assembly shown;

[0064] Figure 8 for Figure 4 A cross-sectional view of the end cap assembly shown;

[0065] Figure 9 for Figure 5 A schematic diagram of the support structure of the end cap assembly shown;

[0066] Figure 10 Another structural schematic diagram of the end cap assembly provided in some embodiments of this application;

[0067] Figure 11 for Figure 10 The diagram shows an exploded view of the endplate assembly.

[0068] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0069] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Battery Module; 21. Housing;

[0070] 6. Module body; 61. Battery cell;

[0071] 7. End plate assembly;

[0072] 71. First end plate; 711. First plate body; 7111. Base plate; 7112. First protrusion; 7113. Recessed space; 712. Rolled edge structure; 7121. First wall; 7122. Second wall; 7123. Third wall; 7124. Receiving cavity; 7125. Fourth wall; 7126. First through hole; 7127. Second through hole; 7128. Lifting hole; 7129. Positioning hole;

[0073] 72. Second end plate; 721. Second plate body; 722. Filling structure; 7221. Reinforcing rib; 7222. Groove; 7223. First reinforcing rib; 7224. Second reinforcing rib; 7225. Third reinforcing rib; 7226. Fourth reinforcing rib; 723. Positioning groove;

[0074] 73. Support component; 731. Support body; 732. Protrusion; 7321. First protrusion;

[0075] 74. Limiting convex part;

[0076] 75. Limiting hole;

[0077] 76. First adhesive layer;

[0078] 77. Second adhesive layer;

[0079] 78. Installation cavity;

[0080] 8. Limiting belt;

[0081] 9. Output terminal base;

[0082] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0083] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0084] 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.

[0085] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0086] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0087] 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 cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0088] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0089] In this application, "multiple" means two or more (including two).

[0090] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0091] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. 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 prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0092] A single battery cell includes electrode components and an electrolyte. The electrode components include 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, which is coated on the surface of the positive current collector. The positive current collector includes a positive electrode coating area and a positive electrode tab connected to the coating area. The coating area is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery cell as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area. The negative electrode coating area is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0093] The battery cell also includes a casing, inside which a cavity is formed to house the electrode assembly. The casing protects the electrode assembly from external contaminants to prevent them from being affected by external objects during charging or discharging.

[0094] When multiple battery cells are arranged in sequence to form a battery module, it is usually necessary to set an end plate at at least one end of the battery module in the length direction. The end plate is attached to the battery cell to limit and protect the battery cell.

[0095] When a battery cell expands during a charge-discharge cycle, the length of the battery module increases. The structure that restricts expansion, which works with the end plate, is subjected to tensile force. This force acts on both ends of the end plate in the width direction of the battery module, making the end plate prone to deformation. As a result, the supporting effect in the width direction is weakened, causing the structure that restricts expansion to deform in the length direction of the battery module. Consequently, the restrictive effect of the end plate on the expansion of the battery cell decreases, leading to deformation of the battery cell and a shorter lifespan.

[0096] In view of this, this application provides an end plate assembly, which consists of a first end plate and a second end plate that are fitted together, and two rolled edge structures at both ends of the first plate body along a first direction. The two rolled edge structures and the first plate body enclose a receiving space. At least a portion of the second end plate is located in the receiving space and abuts against or is spaced apart from at least one rolled edge structure in the first direction. In this way, the second end plate can support the first end plate in the first direction, reduce the deformation of the first end plate in the first direction, thereby improving the support capacity of the first end plate in the first direction. This, in turn, reduces the deformation of the expansion-restricting structure in the length direction of the battery module, thereby improving the limiting effect of the end plate assembly on the expansion of the battery cell, reducing the deformation of the battery cell, and improving the service life of the battery cell.

[0097] The endplate assembly described in the embodiments of this application is applicable to batteries and electrical devices that use batteries.

[0098] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0099] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0100] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0101] like Figure 1 As shown, a battery 2 is installed inside the vehicle 1. The battery 2 can be located at the bottom, front, or rear of the vehicle 1. The battery 2 can be used to power the vehicle 1; for example, the battery 2 can serve as the operating power source for the vehicle 1.

[0102] Vehicle 1 may also include controller 3 and motor 4. Controller 3 is used to control battery 2 to supply power to motor 4, for example, for the power needs of vehicle 1 during start-up, navigation and driving.

[0103] In some embodiments of this application, the battery 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0104] Figure 2 This application provides schematic diagrams of the battery structure for some embodiments.

[0105] like Figure 2 As shown, the battery 2 includes a housing 21 and a battery module 5. The housing 21 has a receiving space, and the battery module 5 is disposed in the receiving space.

[0106] In battery 2, there can be one or more battery modules 5. If there are multiple battery modules 5, they can be connected in series, in parallel, or in a mixed configuration to form a whole and be fixed to the housing 21. A mixed configuration means that multiple battery modules 5 are connected in both series and parallel configurations.

[0107] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application.

[0108] like Figure 3 As shown, this application also provides a battery module 5, including a module body 6 and an end plate assembly 7. The module body 6 includes a plurality of battery cells 61, which are arranged sequentially along the second direction Y. The end plate assembly 7 is disposed at at least one end of the module body 6 in the second direction Y.

[0109] In the module body 6, multiple battery cells 61 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 61 are connected in both series and parallel.

[0110] The end plate assembly 7 and the module body 6 can be connected by adhesive or other means.

[0111] For example, there are two end plate assemblies 7, which are disposed at both ends of the module body 6 in the second direction Y.

[0112] Figure 4 This is a schematic diagram of one structure of an end cap assembly provided in some embodiments of this application. Figure 5 for Figure 4 The diagram shown is an exploded view of the end cap assembly. Figure 6 for Figure 5 The diagram shows the structure of the first end plate of the end cap assembly.

[0113] like Figures 4-6 As shown, this application also provides an end plate assembly 7, including a first end plate 71 and a second end plate 72. The first end plate 71 includes a first plate body 711 and two rolled edge structures 712, which are located at opposite ends of the first plate body 711 along a first direction X. The second end plate 72 is attached to the first plate body 711, and the side of the second end plate 72 facing away from the first end plate 71 is used to connect to a battery cell 61. The rolled edge structures 712 extend along the direction from the first end plate 71 to the second end plate 72 and form a receiving space with the first plate body 711. At least a portion of the second end plate 72 is located in the receiving space and is attached to the first plate body 711. The second end plate 72 and at least one rolled edge structure 712 are abutted or spaced apart in the first direction X, which intersects the arrangement direction of the first end plate 71 and the second end plate 72.

[0114] The end plate assembly 7 of this embodiment can be connected to a side plate or other structure, or it can cooperate with a limiting band 8, such as an annular steel band, to limit the expansion of the battery cell 61. When the end plate assembly 7 cooperates with the limiting band 8, it is sleeved on the outer periphery of the module body 6 and the end plate assembly 7, pressing the end plate assembly 7 against at least one end of the module body 6 in the second direction Y. The second direction Y intersects the first direction X. The second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72. Furthermore, the second direction Y is perpendicular to the first direction X.

[0115] In this embodiment of the application, the first end plate 71 is located on the side of the second end plate 72 away from the battery cell 61, that is, the first end plate 71 is located on the outside of the second end plate 72.

[0116] The second end plate 72 in this embodiment can be connected to the battery cell 61 by means of bonding, snap-fitting, or other methods. The side of the second end plate 72 facing away from the first end plate 71 in this embodiment can be a plane, a curved surface, or an irregularly shaped surface combining a plane and a curved surface.

[0117] In this embodiment, the second end plate 72 is attached to the first end plate 71. The two can be in direct contact or can be attached after other interlayers are sandwiched between them.

[0118] The first plate body 711 in this embodiment can be a flat plate structure, a corrugated plate structure, or other shapes.

[0119] The rolled edge structure 712 of this application embodiment is curved, and it can be bent and extended toward the side facing the second end plate 72, or it can be bent and extended toward the side away from the second end plate 72.

[0120] The rolled edge structure 712 of this application embodiment can be formed by bending and connecting multiple straight walls, or it can be a curved wall structure, or it can be a structure combining straight walls and curved walls.

[0121] Optionally, the first plate body 711 and the rolled edge structure 712 are integrally formed.

[0122] The rolled edge structure 712 extends along the direction from the first end plate 71 to the second end plate 72, that is, the rolled edge structure 712 protrudes from the first plate body 711, thereby forming an accommodating space with the first plate body 711.

[0123] In this embodiment, the second end plate 72 and at least one rolled edge structure 712 are abutted or spaced apart in the first direction X. That is, the portion of the rolled edge structure 712 protruding from the first plate body 711 and the portion of the second end plate located in the receiving space are arranged along the first direction X, and the two abutted or spaced apart.

[0124] Optionally, the first direction X is perpendicular to the arrangement direction of the first end plate 71 and the second end plate 72.

[0125] The end plate assembly 7 of this application embodiment is provided with a first end plate 71 and a second end plate 72 that fit together, and a rolled edge structure 712 is provided at each end of the first plate body 711 along the first direction X. The two rolled edge structures 712 and the first plate body 711 surround and form a receiving space. At least a portion of the second end plate 72 is located in the receiving space and abuts against or is spaced apart from at least one rolled edge structure 712 in the first direction. In this way, the second end plate can support at least one rolled edge structure 712 in the first direction X, reduce the deformation of the rolled edge structure 712 in the first direction X, thereby improving the support capacity of the first end plate 71 in the first direction X, and further reducing the deformation of the expansion-limiting structure, such as the limiting band 8, in the second direction Y of the battery module 5. This improves the limiting effect of the end plate assembly 7 on the expansion of the battery cell 61, reduces the deformation of the battery cell 61, and improves the service life of the battery cell 61.

[0126] Figure 7 for Figure 5 The diagram shows the structure of the second end plate of the end cap assembly.

[0127] Please see Figure 7 In some embodiments, the second end plate 72 includes a second plate body 721 connected to the first end plate 71 and a filling structure 722. The second plate body 721 is used to fit the battery cell 61. The filling structure 722 is disposed on the side of the second plate body 721 facing the first end plate 71. At least part of the filling structure 722 is located in the receiving space and fits the first plate body 711. Two rolled edge structures 712 are located on both sides of the filling structure 722 in the first direction X. At least one rolled edge structure 712 abuts against or is spaced apart from the filling structure 722 in the first direction X.

[0128] The material of the filling structure 722 in this embodiment can be metal, foam material, plastic, etc.

[0129] The side of the second plate body 721 that is away from the filling structure 722 can be a plane, a curved surface, or a combination of plane and curved surfaces.

[0130] The filling structure 722 in this embodiment can be a solid block structure or a hollow structure.

[0131] The second plate body 721 and the filling structure 722 can be connected by means of integral molding, welding or bonding.

[0132] The filling structure 722 of this application embodiment is attached to the first plate body 711. The two can be in direct contact or can be attached after other interlayers are sandwiched.

[0133] The rolled edge structure 712 and the filling structure 722 are abutted or spaced apart in the first direction X. That is, the part of the rolled edge structure 712 protruding from the first plate body 711 and the filling structure 722 are arranged along the first direction X, and the two abutted or spaced apart.

[0134] By providing a second plate body 721 for connecting the battery cell 61, the configuration of the filling structure 722 can be more flexible, that is, it can adopt a hollow structure, a solid structure or other structures.

[0135] Optionally, the projection of the second plate body 721 along the second direction Y onto the filling structure 722 covers the filling structure 722. This results in a larger area for the second plate body 721, increasing the connection area with the battery cell 61 and improving the tightness of the connection. The second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72.

[0136] Optionally, all of the filling structure 722 is located in the receiving space.

[0137] In some embodiments, the two rolled edge structures 712 are respectively abutted against or spaced apart from the filling structure 722 in the first direction X.

[0138] In this embodiment of the application, the two rolled edge structures 712 can be arranged with a gap between one and the filling structure 722, and the other abuts against the filling structure 722; or both rolled edge structures 712 can abut against the filling structure 722, or both rolled edge structures 712 can have a gap with the filling structure 722.

[0139] With this configuration, the filling structure 722 can support the two rolled edge structures 712 in the first direction X, further reducing the deformation of the rolled edge structure 712 in the first direction X, further improving the support capacity of the first end plate 71 in the first direction X, thereby reducing the deformation of the expansion-limiting structure, such as the limiting band 8, in the second direction Y of the battery module 5, thereby improving the expansion-limiting effect of the end plate assembly 7 on the battery cell 61, reducing the deformation of the battery cell 61, and improving the service life of the battery cell 61.

[0140] In some embodiments, the second plate body 721 protrudes from the opposite ends of the filling structure 722 along the first direction X, and the two rolled edge structures 712 are attached and connected to the opposite ends of the second plate body 721 along the first direction.

[0141] In this embodiment, the rolled edge structure 712 is bonded to the second plate body 721. The two can be in direct contact or bonded together after other sandwich structures are sandwiched between them. For example, the rolled edge structure 712 and the second plate body 721 are bonded together by a second adhesive layer 77. The two can also be connected by welding or other methods.

[0142] This configuration improves the tightness of the connection between the first end plate 71 and the second end plate 72.

[0143] Figure 8 for Figure 4 A cross-sectional view of the end cap assembly shown.

[0144] Please see Figure 8 In some embodiments, the rolled edge structure 712 includes a first wall 7121, a second wall 7122, and a third wall 7123 connected at an angle along its own bending direction. The first wall 7121, the second wall 7122, and the third wall 7123 surround and form a receiving cavity 7124. The first wall 7121 and the third wall 7123 are arranged opposite each other along the second direction Y. The first wall 7121 is connected to the first plate body 711. The end of the third wall 7123 facing away from the second wall 7122 abuts against or has a gap with the filling structure 722. The second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72.

[0145] The first wall 7121, the second wall 7122, and the third wall 7123 of this application embodiment form a semi-annular structure. The shape of the first wall 7121, the second wall 7122, or the third wall 7123 is not limited in this application embodiment; it can be a straight wall, a curved wall, or an irregularly shaped wall combining straight and curved walls.

[0146] The first wall 7121 and the second wall 7122, as well as the second wall 7122 and the third wall 7123, can be connected at acute, obtuse, or right angles in the embodiments of this application.

[0147] The first wall 7121 and the third wall 7123 in this embodiment are arranged opposite each other along the second direction Y, which does not mean that they are necessarily parallel to each other, and one may also be inclined relative to the other.

[0148] In this application embodiment, the first wall body 7121 and the first plate body 711 can be connected by welding or integral molding. For example, the first wall body 7121, the second wall body 7122, the third wall body 7123 and the first plate body 711 are integrally molded.

[0149] In this embodiment of the application, the second direction Y intersects with the first direction X. Furthermore, the second direction Y is perpendicular to the first direction X.

[0150] The presence of the receiving cavity 7124 allows the rolled edge structure 712 to have better support in the second direction Y, reducing the deformation of the rolled edge structure 712 in the second direction Y after being subjected to force, thus providing good protection for the battery cell. Furthermore, when the limiting band 8 is used to restrict the expansion of the battery cell 61, the rolled edge structure 712 can support and tension the limiting band 8 in the second direction Y, improving the limiting effect of the limiting band 8 on the expansion of the battery cell 61 and reducing the deformation of the battery cell 61.

[0151] In some embodiments, the second plate body 721 protrudes from opposite ends of the filling structure 722 along the first direction, and the third wall body 7123 is attached to and connected to the second plate body 721.

[0152] In this embodiment, the third wall body 7123 is bonded to the second plate body 721. The two can be in direct contact or bonded together after other sandwich structures are incorporated. For example, the third wall body 7123 and the second plate body 721 are bonded together by a second adhesive layer 77. They can also be connected by welding or other methods.

[0153] This configuration improves the tightness of the connection between the first end plate 71 and the second end plate 72.

[0154] In some embodiments, at least a portion of the first wall body 7121 protrudes from the first plate body 711 in the direction from the second end plate 72 to the first end plate 71.

[0155] Specifically, at least a portion of the first wall 7121 protrudes from the first plate body 711. This could be because the first wall 7121 itself is a curved wall or a bent wall, and the bending or folding causes a portion of the first wall 7121 to protrude from the first plate body 711; or the entire first wall 7121 may be located on the side of the first plate body 711 away from the second end plate 72; or it could be other cases.

[0156] When the limiting band 8 is used in conjunction with the end plate assembly 7, this configuration reduces the local pressure exerted by the limiting band 8 on the first plate body 711 in the second direction Y when the battery cell 61 expands. The pressure is then evenly transmitted to the first plate body 711 through the rolled edge structure 712, thereby further improving the uniformity of the force on the first plate body 711, reducing the deformation of the first plate body 711, and thus improving the limiting effect of the first end plate 71 on the expansion of the battery cell 61 and reducing the deformation of the battery cell 61.

[0157] In some embodiments, at least a portion of the second wall 7122 protrudes from the second end plate 72 along the first direction X.

[0158] In this embodiment, the second wall 7122 protrudes from the second end plate 72 in a direction away from the first plate body 711. Specifically, at least a portion of the second wall 7122 protrudes from the second end plate 72. This can be because the second wall 7122 itself is a curved wall or a bent wall, and the portion of the second wall 7122 protrudes from the second end plate 72 after bending or folding; or the entire second wall 7122 can protrude from the second end plate 72 along the second direction Y; or other situations may exist.

[0159] When the limiting band 8 is used in conjunction with the end plate assembly 7, since at least part of the second wall 7122 protrudes from the second end plate 72 along the first direction X, the supporting effect of the second wall 7122 in the second direction Y is further improved, the pressure exerted by the limiting band 8 on the side area of ​​the module body 6 is reduced, thereby forming a protective effect on the battery cell 61, and at the same time, the limiting band 8 is further tightened, thereby improving the limiting effect of the end plate assembly 7 on the expansion of the battery cell 61.

[0160] In some embodiments, the first wall 7121 and the second wall 7122 transition smoothly.

[0161] By setting the first wall 7121 and the second wall 7122 to a smooth transition, the limiting band 8 will contact a smooth curved surface, which can reduce damage to the limiting band 8.

[0162] In some embodiments, the rolled edge structure 712 further includes at least one fourth wall 7125, which is connected at an angle to at least one end of the third wall 7123 in the third direction Z. The fourth wall covers at least part of the receiving cavity 7124 and is provided with a first through hole 7126 through which the target connector passes. The third direction Z, the first direction X, and the second direction Y intersect each other.

[0163] Optionally, the third direction Z, the first direction X, and the second direction Y are perpendicular to each other.

[0164] Optionally, the first wall 7121, the second wall 7122, the third wall 7123 and the fourth wall 7125 are integrally formed.

[0165] In this embodiment of the application, the fourth wall 7125 and the third wall 7123 can be connected at an acute angle, an obtuse angle, or a right angle. For example, the fourth wall 7125 and the third wall 7123 are connected at a right angle. Further optionally, the fourth wall 7125 and the third wall 7123 have a smooth transition.

[0166] Optionally, the fourth wall 7125 is plate-shaped and perpendicular to the third direction Z. Of course, the fourth wall 7125 can also be a curved wall.

[0167] The target connector in this embodiment can be a bolt, which passes through the first through hole 7126 of the fourth wall 7125 and is threadedly connected to the housing 21. Of course, other target connectors can also be used.

[0168] With the fourth wall 7125 provided, there is no need to provide other transition connecting members on the rolled edge structure 712 at the end where the fourth wall 7125 is provided. This improves the problem of weak intermediate mechanical properties caused by the addition of transition connecting members. The target connector can directly pass through the fourth wall 7125, which is more convenient to use.

[0169] In some embodiments, there are two fourth wall bodies 7125, which are connected to opposite ends of the third wall body 7123 in the third direction Z, and two first through holes 7126 are aligned along the third direction Z.

[0170] Optionally, the fourth wall 7125 is plate-shaped, and the two fourth walls 7125 are arranged in parallel and perpendicular to the third direction Z.

[0171] By setting two fourth walls 7125, there is no need to place other structures on the rolled edge structure 712, which further improves the problem of weak intermediate mechanical properties caused by the addition of transition connecting members. The target connector can be locked to the housing 21 by directly passing through the two fourth walls 7125, which is more convenient to use.

[0172] In some embodiments, the projection of the fourth wall 7125 along a third direction Z onto the first wall 7121 covers at least a portion of the first wall 7121 and abuts against or has a gap with the end of the first wall 7121.

[0173] With this configuration, when the target connector is locked, the first wall 7121 can provide support for the fourth wall 7125, thereby reducing the deformation of the fourth wall 7125 and improving the tightness of the locking between the end plate assembly 7 and the housing 21.

[0174] Figure 9 for Figure 5 The diagram shows the structural schematic of the support component for the end cap assembly.

[0175] Please see Figure 8 and Figure 9 In some embodiments, the end plate assembly 7 further includes a support 73, at least a portion of which is located in the receiving cavity 7124 and connected to the first wall 7121 and the third wall 7123.

[0176] The support member 73 in this embodiment can be a plate, a strip, or a block.

[0177] The support member 73 can be connected to the first wall 7121 or the third wall 7123 by means of snap-fit, adhesive or welding.

[0178] When the limiting band 8 is used in conjunction with the end plate assembly 7, the support member 73 is supported between the first wall 7121 and the third wall 7123. Therefore, the support capacity of the rolled edge structure 712 in the second direction Y can be improved, and the deformation of the rolled edge structure 712 in the second direction Y after being subjected to force can be reduced. This improves the tensioning capacity of the rolled edge structure 712 on the limiting band 8 and enhances the limiting effect of the end plate assembly 7 on the expansion of the battery cell 61.

[0179] In some embodiments, the support member 73 includes a support body 731 and protrusions 732 disposed on opposite sides of the support body 731 along the second direction Y. The first wall 7121 and the third wall 7123 are both provided with second through holes 7127, and the protrusions 732 and the second through holes 7127 are inserted into each other.

[0180] In this embodiment, the number of protrusions 732 on one side of the support body 731 can be one or more. Optionally, the protrusions 732 and the second through holes 7127 are inserted into each other. Of course, two protrusions 732 located on the same side of the support body 731 can also be inserted into one second through hole 7127.

[0181] The protrusion 732 and the second through hole 7127 are inserted into each other, that is, the two are matched in size so that the second through hole 7127 can limit the protrusion 732, thereby reducing the displacement of the support 73 during use.

[0182] The support 73 and the rolled edge structure 712 are connected by a plug-in joint, which facilitates installation and disassembly.

[0183] In some embodiments, when the rolled edge structure 712 includes a fourth wall 7125, the fourth wall 7125 protrudes from the first wall 7121 along the second end plate 72 to the first end plate 71. A plurality of protrusions 732 disposed on the support body 731 include a first protrusion 7321. The first protrusion 7321 is inserted into and protrudes from the first wall 7121. The first protrusion 7321 and the fourth wall 7125 are spaced apart and form a limiting space between them for limiting the limiting band 8.

[0184] In this embodiment of the application, the fourth wall 7125 protruding from the first wall 7121 along the second end plate 72 to the first end plate 71 refers to a portion of the fourth wall 7125 protruding from the first wall 7121.

[0185] In this embodiment of the application, the first protrusion 7321 and the fourth wall 7125 both protrude from the first wall 7121, thereby forming a limiting effect on both ends of the limiting band 8.

[0186] Optionally, the support member 73 has two first protrusions 7321 that are inserted into the first wall body 7121, and there are two fourth wall bodies 7125. The two fourth wall bodies 7125 are connected to the two opposite ends of the third wall body 7123 in the third direction Z. The two fourth wall bodies 7125 and the two first protrusions 7321 are engaged one by one to form two limiting spaces for limiting the upper and lower limiting bands 8.

[0187] Optionally, when the support member 73 has a plurality of protrusions 732 that are inserted into the first wall body 7121, all of the protrusions 732 except the first protrusion 7321 are located in the second through hole 7127.

[0188] This configuration allows the first protrusion 7321 and the fourth wall 7125 to limit the position of the limiting band 8, reducing the possibility of the limiting band 8 falling off.

[0189] In some embodiments, the side of the second plate body 721 facing away from the filling structure 722 is a plane.

[0190] Optionally, the second plate body 721 and the battery cell 61 are bonded together using a first adhesive layer 76.

[0191] Optionally, the second plate body 721 has a flat plate structure.

[0192] The side of the second plate body 721 facing away from the filling structure 722 is set as a plane, and the plane fits more closely with the surface of the battery cell 61, and the connection is more secure.

[0193] In some embodiments, the filling structure 722 includes a plurality of staggered reinforcing ribs 7221, which engage with the first end plate 71 in a concave-convex manner, and the plurality of reinforcing ribs 7221 and the second plate body 721 surround to form a plurality of grooves 7222 with openings facing the first end plate 71.

[0194] The included angle formed by the intersection of multiple reinforcing ribs 7221 in this embodiment can be an acute angle, an obtuse angle, or a right angle. Optionally, the included angle formed by the intersection of multiple reinforcing ribs 7221 is a right angle.

[0195] Optionally, the surface on which the multiple reinforcing ribs 7221 mate with the second end plate 72 is a wavy curved surface.

[0196] Optionally, the multiple reinforcing ribs 7221 include multiple first reinforcing ribs 7223 and multiple second reinforcing ribs 7224. The multiple first reinforcing ribs 7223 are arranged along a third direction Z and extend along a first direction X; the multiple second reinforcing ribs 7224 are arranged along the first direction X and extend along a third direction Z, and the multiple first reinforcing ribs 7223 and multiple second reinforcing ribs 7224 are staggered.

[0197] Setting the filling structure 722 as a structure with multiple reinforcing ribs 7221 intersecting each other, and forming multiple grooves 7222 with the second plate body 721, can reduce the weight of the second end plate 72 and achieve lightweight design.

[0198] In some embodiments, the reinforcing rib 7221, the second plate body 721, and the first end plate 71 surround a mounting cavity 78 for mounting the output electrode base 9. Further optionally, the plurality of reinforcing ribs 7221 include a third reinforcing rib 7225 and a fourth reinforcing rib 7226 disposed opposite each other along a first direction X, the second plate body 721 and the first end plate 71 disposed opposite each other along a second direction Y, and the third reinforcing rib 7225, the fourth reinforcing rib 7226, the second plate body 721, and the first end plate 71 surround a mounting cavity 78 with a quadrilateral opening.

[0199] The enclosure forms an installation cavity 78, which facilitates the installation of the output electrode base 9 and serves to limit its movement.

[0200] Alternatively, the end faces of the third reinforcing rib 7225, the fourth reinforcing rib 7226, and the first end plate 71 at the opening of the mounting cavity 78 are on the same plane. This arrangement allows for a more secure fit with the output electrode base 9.

[0201] Figure 10 Another structural schematic diagram of the end cap assembly provided in some embodiments of this application; Figure 11 for Figure 10 The diagram shows an exploded view of the endplate assembly.

[0202] Please see Figure 10 and Figure 11 In some embodiments, the filling structure 722 is a solid structure.

[0203] In this embodiment, the filling structure 722 is a solid structure, but it can also have grooves or holes, meaning it is generally a solid structure. Optionally, the filling structure 722 is made of a polymer material.

[0204] By setting the filling structure 722 as a solid structure, the end plate assembly 7 can transmit the pressure that suppresses expansion to the battery cell 61 more evenly, reduce the local stress of the battery cell 61, and improve the uniformity of the force on the battery cell 61.

[0205] In some embodiments, the first plate body 711 has two opposite ends in a third direction Z, and the rolled edge structure 712 extends from one end of the first plate body 711 to the other end, with the first direction X and the third direction Z intersecting.

[0206] Optionally, the third direction Z is parallel to the arrangement direction of the top and bottom ends of the battery cell 61, wherein the top end of the battery cell 61 is provided with an electrode post. Further optionally, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0207] Extending the rolled edge structure 712 from one end of the first plate body 711 to the other end not only improves the flexibility of the positioning of the limiting band 8, but also allows the pressure on the rolled edge structure 712 to be directly transmitted to more areas of the first plate body 711, thereby improving the limiting effect of the first plate body 711 on the expansion of the battery cell 61.

[0208] In some embodiments, the first plate body 711 includes a substrate 7111 and a first protrusion 7112. The first protrusion 7112 protrudes from the substrate 7111 along the direction from the second end plate 72 to the first end plate 71. A recessed space 7113 is formed on the side of the first protrusion 7112 facing the second end plate 72. The second end plate 72 is attached to the substrate 7111 and the first protrusion 7112.

[0209] When there are multiple first protrusions 7112 in the embodiments of this application, the shapes of the multiple first protrusions 7112 may be the same or different. The multiple first protrusions 7112 may be arranged in an array or in a random order.

[0210] Optionally, the first end plate 71 is made of metal and manufactured using a stamping process, which improves manufacturing efficiency.

[0211] In this embodiment, the second end plate 72, after being subjected to the expansion force of the battery cell 61, transmits the expansion force to the first end plate 71. The first end plate 71, in conjunction with other deformation-limiting structures such as the limiting band 8, restricts the expansion of the battery cell 61 via the second end plate 72. Since the first end plate 71 has a first protrusion 7112, it has good bending resistance and is not easily bent. Therefore, compared with a flat plate structure, it is not easy to deform. Thus, when the battery cell 61 expands, it can effectively limit the deformation of the battery cell 61, thereby reducing the degree of deformation of the battery cell 61 after expansion and extending the service life of the battery cell 61.

[0212] In some embodiments, there are multiple first protrusions 7112, which are spaced apart along a third direction Z and extend along a first direction X. The third direction Z and the second direction Y intersect the first direction X in pairs, and the second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72.

[0213] The first protrusion 7112 in this embodiment can extend along the first direction X to the entire substrate 7111, or it can extend along the first direction X to a portion of the substrate 7111.

[0214] Optionally, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0215] Multiple first protrusions 7112 are spaced apart along the third direction Z and extend along the first direction X. The substrate 7111 also extends along the first direction X. In this way, the expansion of the battery cells 61, whose top and bottom ends are arranged along the third direction Z, can be effectively limited. Specifically, experiments have shown that the middle region of the battery cell 61 along the first direction X is prone to expansion. Therefore, setting the first protrusions 7112 and the substrate 7111 to extend along the first direction X can better limit the expansion of the battery cell 61.

[0216] In some embodiments, one of the first end plate 71 and the second end plate 72 is provided with a limiting protrusion 74, and the other is provided with a limiting hole 75, and the limiting protrusion 74 and the limiting hole 75 are inserted into each other.

[0217] Optionally, the first end plate 71 is provided with a limiting hole 75, and the second end plate 72 is provided with a limiting protrusion 74.

[0218] The limiting protrusion 74 in this embodiment can be a square rod or a pin, etc.

[0219] The dimensions of the limiting protrusion 74 and the limiting hole 75 in this embodiment are matched.

[0220] The limiting protrusion 74 and the limiting hole 75 are provided to limit the movement of the first end plate 71 and the second end plate 72 during assembly and subsequent use, thereby reducing the relative displacement of the first end plate 71 and the second end plate 72.

[0221] In some embodiments, the second plate body 721 is an insulating element.

[0222] For example, the second plate body 721 may be made of plastic or an insulating composite material.

[0223] Alternatively, the filling structure 722 may be an insulating element.

[0224] Setting the second plate body 721 as an insulating component can increase the insulation performance between the end plate assembly 7 and the battery cell 61, thereby improving the reliability of the battery module 5.

[0225] In some embodiments, the first end plate 71 is provided with a positioning hole 7129 that extends through itself in the second direction Y, and the second end plate 72 is provided with a positioning groove 723 that opens toward the first end plate 71. The positioning groove 723 is disposed opposite to and communicates with the positioning hole 7129.

[0226] For example, the positioning hole 7129 is a circular hole, and the opening of the positioning groove 723 is circular. Optionally, the diameter of the positioning hole 7129 is smaller than the diameter of the opening of the positioning groove 723. Of course, the openings of the positioning hole 7129 and the positioning groove 723 can also be other shapes, such as rectangles.

[0227] The positioning hole 7129 and the positioning groove 723 are provided so that the first end plate 71 and the second end plate 72 can be used for positioning when the battery modules 5 are assembled, thereby improving the positional accuracy of the first end plate 71 and the second end plate 72.

[0228] In some embodiments, the first wall 7121 is provided with a lifting hole 7128 for use when lifting the battery module 5.

[0229] This application embodiment also provides a battery module 5, including the end plate assembly 7 and the module body 6 described above. The module body 6 includes a plurality of battery cells 61, which are arranged sequentially along a second direction Y. The end plate assembly 7 is disposed at at least one end of the module body 6 in the second direction Y, which is parallel to the arrangement direction of the first end plate 71 and the second end plate 72.

[0230] In some embodiments, the battery module 5 further includes a limiting band 8, which fits the module body 6 and the end plate assembly 7 together.

[0231] The limit band 8 can be made of steel or other materials.

[0232] The module body 6 and the end plate assembly 7 are fitted together using a limiting band 8, which has strong tensile strength and can effectively limit the expansion of the battery cell 61, while also having low manufacturing cost. In addition, the limiting band 8 is connected to the end plate assembly 7 and the module body 6 by a sleeve connection, which simplifies the installation process and increases production efficiency.

[0233] This application embodiment also provides a battery 2, including the battery module 5 described above.

[0234] This application embodiment also provides an electrical device, including the battery 2 described above, which is used to provide electrical energy.

[0235] Please see Figures 4-11This application provides an end plate assembly 7, which includes a first end plate 71 and a second end plate 72. The first end plate 71 includes a first plate body 711 and two rolled edge structures 712, which are located at opposite ends of the first plate body 711 along a first direction X. The second end plate 72 is attached to the first plate body 711, and the side of the second end plate 72 facing away from the first end plate 71 is used to connect to a battery cell 61. The rolled edge structures 712 extend along the direction from the first end plate 71 to the second end plate 72 and form a receiving space with the first plate body 711. At least a portion of the second end plate 72 is located in the receiving space and is attached to the first plate body 711. The second end plate 72 and at least one rolled edge structure 712 are abutted or spaced apart in the first direction X, which intersects the arrangement direction of the first end plate 71 and the second end plate 72. The second end plate 72 includes a second plate body 721 and a filling structure 722 connected to it. The second plate body 721 is used to adhere to the battery cell 61. The filling structure 722 is disposed on the side of the second plate body 721 facing the first end plate 71. At least part of the filling structure 722 is located in the receiving space and adheres to the first plate body 711. Two rolled edge structures 712 are located on both sides of the filling structure 722 in the first direction X. The two rolled edge structures 712 are respectively abutted against or spaced apart from the filling structure 722 in the first direction X. The second plate body 721 protrudes from the opposite ends of the filling structure 722 along the first direction X, and the two rolled edge structures 712 are adhered to and connected to the opposite ends of the second plate body 721 along the first direction X. The rolled edge structure 712 includes a first wall 7121, a second wall 7122, and a third wall 7123 connected at an angle along its own bending direction. The first wall 7121, second wall 7122, and third wall 7123 form a receiving cavity 7124. The first wall 7121 and third wall 7123 are arranged opposite each other along a second direction Y. The first wall 7121 is connected to the first plate body 711. The end of the third wall 7123 facing away from the second wall 7122 abuts against or has a gap with the filling structure 722. The second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72. The third wall 7123 is attached to and connected to the second plate body 721. At least a portion of the first wall 7121 protrudes from the first plate body 711 along the direction from the second end plate 72 to the first end plate 71. At least a portion of the second wall 7122 protrudes from the second end plate 72 along a first direction X. The first wall 7121 and the second wall 7122 transition smoothly. The rolled edge structure 712 also includes two fourth walls 7125, which are connected to the opposite ends of the third wall 7123 in the third direction Z at an angle. The fourth walls cover at least part of the receiving cavity 7124 and are provided with a first through hole 7126 for the target connector to pass through. The third direction Z, the first direction X, and the second direction Y intersect each other.The projection of the fourth wall 7125 along the third direction Z onto the first wall 7121 covers at least a portion of the first wall 7121 and abuts against or has a gap with the end of the first wall 7121. The end plate assembly 7 also includes a support member 73, at least a portion of which is located in the receiving cavity 7124 and connected to the first wall 7121 and the third wall 7123. The support member 73 includes a support body 731 and protrusions 732 disposed on opposite sides of the support body 731 along the second direction Y. Both the first wall 7121 and the third wall 7123 are provided with second through holes 7127, and the protrusions 732 and the second through holes 7127 are inserted into each other. The fourth wall 7125 protrudes from the first wall 7121 along the second end plate 72 to the first end plate 71. Multiple protrusions 732 on the supporting body 731 include a first protrusion 7321, which inserts into and protrudes from the first wall 7121. The first protrusion 7321 and the fourth wall 7125 are spaced apart, forming a limiting space between them for limiting the limiting band 8. The side of the second plate body 721 facing away from the filling structure 722 is planar. The first plate body 711 has two opposite ends in the third direction Z. A rolled edge structure 712 extends from one end of the first plate body 711 to the other end, intersecting in the first direction X and the third direction Z. The first plate body 711 includes a substrate 7111 and a first protrusion 7112. The first protrusion 7112 protrudes from the substrate 7111 along the direction from the second end plate 72 to the first end plate 71. A recessed space 7113 is formed on the side of the first protrusion 7112 facing the second end plate 72. The second end plate 72 is attached to the substrate 7111 and the first protrusion 7112. There are multiple first protrusions 7112, spaced apart along a third direction Z and extending along a first direction X. The third direction Z and the second direction Y intersect the first direction X in pairs. The second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72. The second plate body 721 is an insulating element. The filling structure 722 is an insulating element.

[0236] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0237] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An endplate assembly, characterized in that, include: The first end plate includes a first plate body and two rolled edge structures, the two rolled edge structures being located at opposite ends of the first plate body along a first direction; The second end plate is attached to the first plate body, and the side of the second end plate opposite to the first end plate is used to connect to the battery cell. The rolled edge structure extends along the direction from the first end plate to the second end plate and forms an accommodating space with the first plate body. At least a portion of the second end plate is located in the accommodating space and is attached to the first plate body. The second end plate and at least one of the rolled edge structures abut against each other or are spaced apart in the first direction. The first direction intersects the arrangement direction of the first end plate and the second end plate. The second end plate includes a second plate body and a filling structure connected to each other. The second plate body is used to fit the battery cell. The filling structure is disposed on the side of the second plate body facing the first end plate. At least part of the filling structure is located in the receiving space and fits the first plate body. Two rolled edge structures are located on both sides of the filling structure in the first direction. At least one rolled edge structure abuts against or is spaced apart from the filling structure in the first direction. The rolled edge structure includes a first wall, a second wall, and a third wall connected at an angle along its own bending direction. The first wall, the second wall, and the third wall surround and form a receiving cavity. The first wall and the third wall are arranged opposite each other along a second direction. The first wall is connected to the first plate body. The end of the third wall away from the second wall abuts against or has a gap with the filling structure. The second direction is parallel to the arrangement direction of the first end plate and the second end plate. The rolled edge structure further includes at least one fourth wall, which is connected at an angle to at least one end of the third wall in the third direction. The fourth wall covers at least a portion of the receiving cavity and is provided with a first through hole for the target connector to pass through. The third direction, the first direction, and the second direction intersect each other.

2. The endplate assembly according to claim 1, characterized in that, The two rolled edge structures are respectively abutted against or spaced apart from the filling structure in the first direction.

3. The end plate assembly according to claim 1, characterized in that, The second plate body protrudes from both opposite ends of the filling structure along the first direction, and the two rolled edge structures are attached and connected to the opposite ends of the second plate body along the first direction.

4. The endplate assembly according to claim 1, characterized in that, The second plate body protrudes from both opposite ends of the filling structure along the first direction, and the third wall body is attached to and connected to the second plate body.

5. The endplate assembly according to claim 1, characterized in that, At least a portion of the first wall protrudes from the first plate body in the direction from the second end plate to the first end plate.

6. The endplate assembly according to claim 1, characterized in that, At least a portion of the second wall protrudes from the second end plate along the first direction.

7. The end plate assembly according to claim 1, characterized in that, The first wall and the second wall transition smoothly.

8. The endplate assembly according to claim 1, characterized in that, There are two fourth wall bodies, which are connected to the opposite ends of the third wall body in the third direction, and the two first through holes are aligned along the third direction.

9. The endplate assembly according to claim 1, characterized in that, The projection of the fourth wall onto the first wall along the third direction covers at least a portion of the first wall and abuts against or has a gap with the end of the first wall.

10. The endplate assembly according to claim 1, characterized in that, It also includes a support member, at least a portion of which is located in the receiving cavity and connected to the first wall and the third wall.

11. The endplate assembly according to claim 10, characterized in that, The support member includes a support body and protrusions disposed on opposite sides of the support body along the second direction. Both the first wall and the third wall are provided with a second through hole, and the protrusion and the second through hole are inserted into each other.

12. The endplate assembly according to claim 11, characterized in that, When the rolled edge structure includes a fourth wall body, the fourth wall body protrudes beyond the first wall body along the direction from the second end plate to the first end plate. The plurality of protrusions disposed on the support body include a first protrusion, which is inserted into and protrudes from the first wall body. The first protrusion and the fourth wall body are spaced apart and form a limiting space between them for limiting the limiting band.

13. The endplate assembly according to any one of claims 1-12, characterized in that, The side of the second plate body that faces away from the filling structure is a plane.

14. The endplate assembly according to any one of claims 1-12, characterized in that, The filling structure includes multiple staggered reinforcing ribs, which together with the second plate body form multiple grooves with openings facing the first end plate.

15. The endplate assembly according to any one of claims 1-12, characterized in that, The filling structure is a solid structure.

16. The endplate assembly according to any one of claims 1-12, characterized in that, The first plate body has two opposite ends in a third direction, and the rolled edge structure extends from one end of the first plate body to the other end, with the first direction and the third direction intersecting.

17. The endplate assembly according to any one of claims 1-12, characterized in that, The first plate body includes a substrate and a first protrusion. The first protrusion protrudes from the substrate along the direction from the second end plate to the first end plate. A recessed space is formed on the side of the first protrusion facing the second end plate. The second end plate is attached to the substrate and the first protrusion.

18. The endplate assembly according to claim 17, characterized in that, The number of the first protrusions is multiple, and the multiple first protrusions are spaced apart along a third direction and extend along the first direction. The third direction and the second direction intersect the first direction in pairs, and the second direction is parallel to the arrangement direction of the first end plate and the second end plate.

19. The endplate assembly according to any one of claims 1-12, characterized in that, One of the first end plate and the second end plate is provided with a limiting protrusion, and the other is provided with a limiting hole. The limiting protrusion and the limiting hole are inserted into each other.

20. The endplate assembly according to claim 1, characterized in that, The second plate body is an insulating component.

21. A battery module, characterized in that, include: The endplate assembly according to any one of claims 1 to 20; The module body includes multiple battery cells arranged sequentially along a second direction. The end plate assembly is disposed at at least one end of the module body in the second direction, and the second direction is parallel to the arrangement direction of the first end plate and the second end plate.

22. The battery module according to claim 21, characterized in that, It also includes a limiting band that fits the module body and the end plate assembly together.

23. A battery, characterized in that, Includes the battery module as described in claim 21 or 22.

24. An electrical appliance, characterized in that, Includes the battery as described in claim 23, the battery being used to provide electrical energy.

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