End plate assembly, battery module, battery and electric device

Abstract

The embodiment of the invention provides an end plate assembly, a battery module, a battery and a power utilization 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 hemming structures, and the two hemming structures are located at the two opposite ends of the first plate body in the first direction. The second end plate is attached to the first plate body, and the side, away from the first end plate, of the second end plate is used for being connected with the battery single body. The hemming structures extend in the direction from the first end plate to the second end plate, a containing space is defined by the hemming structures and the first plate body, at least part of the second end plate is located in the containing space and attached to the first plate body, and the second end plate abuts against at least one hemming structure in the first direction or is arranged at intervals. The first direction intersects with the arrangement direction of the first end plate and the second end plate. The service life of the battery monomer can be prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to an end plate assembly, a battery module, a battery, and an electrical device. Background Art

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

[0003] In the development of battery technology, how to extend the service life of battery cells is a research direction in battery technology. Summary of the invention

[0004] The present application provides an end plate assembly, a battery module, a battery and an electrical device, which can extend the service life of a battery cell.

[0005] An embodiment of the present application provides an end plate assembly, including a first end plate and a second end plate. The first end plate includes a first plate body and two curling structures, and the two curling structures are 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 away from the first end plate is used to connect with the battery cell. The curling structure extends from the first end plate to the second end plate, and is surrounded by the first plate body to form a receiving space, at least part of the second end plate is located in the receiving space and attached to the first plate body, the second end plate and at least one curling structure are abutted or gapped in the first direction, and the first direction intersects with the arrangement direction of the first end plate and the second end plate.

[0006] In the above technical solution, the second end plate can support at least one curling structure in the first direction, reduce the deformation of the curling structure in the first direction, thereby improving the supporting capacity of the first end plate in the first direction, and then reduce the deformation of the expansion limiting structure such as the limiting belt 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 connected second plate body and a filling structure, the second plate body is used to fit the battery cell, the filling structure is arranged on the side of the second plate body facing the first end plate, at least part of the filling structure is located in the accommodating space and fits the first plate body, two curling structures are located on both sides of the filling structure in the first direction, and at least one curling structure is arranged against or with a gap with the filling structure in the first direction.

[0008] In the above technical solution, a second plate body is provided for connecting the battery cells, so the setting of the filling structure can be more flexible, that is, a hollow structure, a solid structure or other structures can be used.

[0009] In some embodiments, the two curling structures are respectively disposed against or with a gap with the filling structure in the first direction.

[0010] In the above technical solution, the filling structure can support the two curling structures in the first direction, further reduce the deformation of the curling structure in the first direction, further improve the supporting capacity of the first end plate in the first direction, and then reduce the deformation of the expansion-limiting structure such as the limiting belt 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 increasing the service life of the battery cell.

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

[0012] In the above technical solution, the tightness of the connection between the first end plate and the second end plate can be improved.

[0013] In some embodiments, the curling structure includes a first wall body, a second wall body, and a third wall body that are connected at angles in sequence along its own bending direction. The first wall body, the second wall body, and the third wall body are arranged to form a accommodating cavity. The first wall body and the third wall body are arranged opposite to each other along the second direction. The first wall body is connected to the first plate body, and one end of the third wall body facing away from the second wall body is against the filling structure or has a gap. 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 accommodating cavity can make the curling structure have better supporting force in the second direction, reduce the deformation of the curling structure in the second direction after being subjected to force, and play a good protective role for the battery cell. In addition, when the limiting belt is used to limit the expansion of the battery cell, the curling structure can support and tension the limiting belt in the second direction, improve the limiting effect of the limiting belt on the expansion of the battery cell, and reduce 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, such an arrangement 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 protrudes from the first plate body along a direction from the second end plate to the first end plate.

[0018] In the above technical solution, when the limiting belt is used in conjunction with the end plate assembly, it is configured such that when the battery cell expands, the local pressure on the first plate body caused by the limiting belt in the second direction can be reduced, and the pressure can be evenly transferred to the first plate body through the curling structure, thereby further improving the uniformity of the force on the first plate body, reducing the deformation of the first plate body, and then improving the limiting effect of the first end plate on the expansion of the battery cell, 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 the first direction.

[0020] In the above technical solution, when the limiting belt is used in conjunction with the end plate assembly, since at least a portion of the second wall protrudes from the second end plate along the first direction, the supporting effect of the second wall in the second direction is further enhanced, and the pressure applied by the limiting belt on the side area of ​​the module body is reduced, thereby protecting the battery cell and further tightening the limiting belt, thereby enhancing 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 body and the second wall body are arranged to have a smooth transition, so that the limiting belt contacts a smooth curved surface, which can reduce damage to the limiting belt.

[0023] In some embodiments, the curling structure also includes at least one fourth wall body, which is connected to the third wall body at an angle at at least one end in the third direction, and the fourth wall body covers at least part of the accommodating cavity and is provided with a first through hole for the target connecting part to pass through, and the third direction, the first direction and the second direction intersect each other.

[0024] In the above technical solution, a fourth wall is set. At the end where the fourth wall is set, there is no need to set other transition connection components on the curling structure, thereby improving the problem of weak intermediate mechanical properties caused by adding transition connection components. The target connecting part can directly pass through the fourth wall, which is more convenient to use.

[0025] In some embodiments, the number of the fourth wall bodies is two, the two fourth wall bodies are connected to two opposite ends of the third wall body in the third direction, and the two first through holes are aligned along the third direction.

[0026] In the above technical solution, two fourth walls are set, so there is no need to place other structures on the curling structure, which further improves the problem of weak intermediate mechanical properties caused by adding transition connection components. The target connecting part can be directly locked with the box body by passing through the two fourth walls, which is more convenient to use.

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

[0028] In the above technical solution, with such arrangement, 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 of the end plate assembly and the box.

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

[0030] In the above technical solution, when the limiting belt is used in conjunction with the end plate assembly, the support member is supported between the first wall and the third wall. Therefore, the supporting capacity of the curling structure in the second direction can be improved, and the deformation of the curling structure in the second direction after being subjected to force can be reduced, thereby improving the tensioning capacity of the curling structure on the limiting belt 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 arranged on opposite sides of the support body along the second direction, the first wall body and the third wall body are both provided with a second through hole, and the protrusions are plug-fitted with the second through holes.

[0032] In the above technical solution, the support member and the curling structure are plug-fitted to facilitate installation and disassembly.

[0033] In some embodiments, when the curling structure includes a fourth wall body, the fourth wall body protrudes from the first wall body along the direction from the second end plate to the first end plate, and the multiple protrusions arranged on the supporting body include a first protrusion, which is plugged into and fits with the first wall body and protrudes from the first wall body. The first protrusion and the fourth wall body are spaced apart and a limiting space for a limiting belt is formed therebetween.

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

[0035] In some embodiments, a side of the second plate body facing away from the filling structure is planar.

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

[0037] In some embodiments, the filling structure includes a plurality of reinforcing ribs arranged in an alternating manner, and the plurality of reinforcing ribs and the second plate body are arranged to form a plurality of grooves opening toward the first end plate.

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

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

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

[0041] In some embodiments, the first plate body has two ends facing each other in a third direction, the curling structure extends from one end of the first plate body to the other end, and the first direction intersects with the third direction.

[0042] In the above technical solution, the curling structure is extended from one end of the first plate body to the other end, which not only improves the flexibility of the position setting of the limiting belt, but also the pressure exerted on the curling structure can 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 cell.

[0043] In some embodiments, 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, and the second end plate is attached to the substrate and the first protrusion.

[0044] In the above technical scheme, the second end plate of the embodiment of the present application transmits the expansion force to the first end plate after being subjected to the expansion force of the battery cell. The first end plate combines with other structures for limiting deformation, such as a limiting belt, to limit the expansion of the battery cell via the second end plate. Since the first end plate has a first convex portion, it has good bending resistance and is not easy to bend. Therefore, it is not easy to deform compared to a flat plate structure. Therefore, when the battery cell expands, the deformation of the battery cell can be effectively limited, thereby reducing the degree of deformation of the battery cell after expansion and extending the service life of the battery cell.

[0045] In some embodiments, there are multiple first protrusions, which are spaced apart along the third direction and extend along the first direction. The third direction, the second direction and the first direction intersect each other, 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, a plurality of first protrusions are arranged at intervals along the third direction and extend along the first direction, and the substrate is also extended along the first direction, so that for battery cells whose top and bottom ends are arranged along the third direction, the expansion of the battery cells can be well restricted. Specifically, it is found through experiments that the middle area of ​​the battery cells along the first direction is prone to expansion, so the first protrusions and the substrate are arranged to extend along the first direction, which can better restrict 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 plug-fitted.

[0048] In the above technical solution, the limiting protrusion and the limiting hole are provided, which can play a limiting role during the assembly process of the first end plate and the second end plate and in the subsequent use process, 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 member.

[0050] In the above technical solution, the second plate body is set as an insulating member, which can increase the insulation performance between the end plate assembly and the battery cell and improve the reliability of the battery module.

[0051] In the second aspect, an embodiment of the present application also provides a battery module, including the above-mentioned end plate assembly and a module body, the module body includes a plurality of battery cells, the plurality of battery cells are arranged in sequence along a second direction, the end plate assembly is arranged 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.

[0052] In some embodiments, the battery module further includes a limiting belt, which sleeves the module body and the end plate assembly together.

[0053] In the above technical solution, the module body and the end plate assembly are sleeved together by the limiting belt, which has strong tensile strength, can effectively limit the expansion of the battery cell, and has low manufacturing cost. In addition, the limiting belt is connected to the end plate assembly and the module body by sleeve connection, which has simple installation steps and high production efficiency.

[0054] In a third aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery module.

[0055] In a fourth aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0057] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0058] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0059] Figure 3 A schematic diagram of the structure of a battery module provided in some embodiments of the present application;

[0060] Figure 4 A schematic diagram of one structure of an end cover assembly provided in some embodiments of the present application;

[0061] Figure 5 for Figure 4 An exploded structural diagram of the end cap assembly shown;

[0062] Figure 6 for Figure 5 A schematic structural diagram of a first end plate of an end cover assembly shown;

[0063] Figure 7 for Figure 5 A schematic structural diagram of a second end plate of the end cover assembly shown;

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

[0065] Fig. 9 for Figure 5 A schematic structural diagram of a support member of the end cap assembly shown;

[0066] Fig.10 Another structural schematic diagram of an end cap assembly provided in some embodiments of the present application;

[0067] Fig.11 for Fig.10 Schematic diagram of the exploded structure of the end plate assembly shown.

[0068] The reference numerals of the specific embodiments are as follows:

[0069] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Battery module; 21. Box;

[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 convex portion; 7113, recessed space; 712, curling structure; 7121, first wall body; 7122, second wall body; 7123, third wall body; 7124, accommodating cavity; 7125, fourth wall body; 7126, first through hole; 7127, second through hole; 7128, hoisting 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 member; 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 pole base;

[0082] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0083] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0084] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

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

[0086] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0087] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0088] In the embodiments of the present application, the same reference numerals represent 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 the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0089] The term "plurality" used in the present application refers to two or more (including two).

[0090] In the present 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 the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0091] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0092] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0093] The battery cell further includes a housing, and a housing is formed inside the housing to accommodate the electrode assembly. The housing can protect the electrode assembly from the outside to prevent external foreign matter from affecting the charging or discharging of the electrode assembly.

[0094] When a plurality of battery cells are sequentially arranged and combined to form a battery module, an end plate is usually provided at least at one end of the battery module in the length direction, and the end plate is attached to the battery cell to limit and protect the battery cell.

[0095] When a battery cell expands during the charge and discharge cycle, the length of the battery module becomes longer, and the expansion limiting structure that cooperates with the end plate will be subjected to tension, acting on both ends of the end plate in the width direction of the battery module. The end plate is prone to deformation, thereby weakening the supporting effect in the width direction, causing the expansion limiting structure to deform in the length direction of the battery module, thereby reducing the limiting effect of the end plate on the expansion of the battery cell, causing the battery cell to deform and shorten its life.

[0096] In view of this, the present application provides an end plate assembly, which is provided with a first end plate and a second end plate that are fitted together, and two curling structures are provided at both ends of the first plate body along the first direction. The two curling structures and the first plate body are surrounded by a accommodating space. At least a portion of the second end plate is located in the accommodating space and is offset or gapped with at least one curling 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 supporting capacity of the first end plate in the first direction, and then reduce the deformation of the expansion-limiting 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 end plate assembly described in the embodiment of the present application is suitable for a battery and an electrical device using the battery.

[0098] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0099] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0100] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0101] like Figure 1 As shown, a battery 2 is disposed inside the vehicle 1, and the battery 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1.

[0102] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1 .

[0103] In some embodiments of the present application, the battery 2 can not only serve as an operating power source for the vehicle 1, but also serve as a 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 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

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

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

[0107] Figure 3 A schematic diagram of the structure of a battery module provided in some embodiments of the present application.

[0108] like Figure 3 As shown, the present 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, the plurality of battery cells 61 are arranged in sequence along the second direction Y, and the end plate assembly 7 is arranged at at least one end of the module body 6 in the second direction Y.

[0109] In the module body 6 , a plurality of battery cells 61 may be connected in series, in parallel, or in mixed connection. Mixed connection means that a plurality of battery cells 61 may be connected in series or in parallel.

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

[0111] Exemplarily, the number of the end plate assemblies 7 is two, and the two end plate assemblies 7 are arranged at two 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 the present application. Figure 5 for Figure 4 The exploded structural diagram of the end cap assembly shown in FIG. Figure 6 for Figure 5 A schematic structural diagram of the first end plate of the end cover assembly is shown.

[0113] like Figure 4-Figure 6 As shown, the present 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 curling structures 712, the two curling structures 712 are located at opposite ends of the first plate body 711 along the 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 away from the first end plate 71 is used to connect with the battery cell 61. The curling structure 712 extends from the first end plate 71 to the second end plate 72, and is surrounded by the first plate body 711 to form a receiving space, at least part of the second end plate 72 is located in the receiving space and attached to the first plate body 711, the second end plate 72 and at least one curling structure 712 are abutted or gapped in the first direction X, and the first direction X intersects with the arrangement direction of the first end plate 71 and the second end plate 72.

[0114] The end plate assembly 7 of the embodiment of the present application can be connected to structures such as side plates, and can also be matched with structures such as limiting belts 8, such as annular steel belts, to limit the expansion of the battery cell 61. When the end plate assembly 7 cooperates with the limiting belt 8, it is sleeved on the outer peripheral side of the module body 6 and the end plate assembly 7, and the end plate assembly 7 is pressed against at least one end of the module body 6 in the second direction Y. The second direction Y intersects with 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] The first end plate 71 of the embodiment of the present application is located on a side of the second end plate 72 away from the battery cell 61 , that is, the first end plate 71 is located on the outer side of the second end plate 72 .

[0116] The second end plate 72 of the present embodiment can be connected to the battery cell 61 by bonding, clamping, etc. The side of the second end plate 72 of the present embodiment facing away from the first end plate 71 can be a plane, a curved surface, or an irregular surface combining a plane and a curved surface.

[0117] In the embodiment of the present application, the second end plate 72 is attached to the first end plate 71 , and the two may be in direct contact or may be attached after sandwiching other interlayers.

[0118] The first plate body 711 of the embodiment of the present application may be a flat plate structure, a corrugated plate structure, or other shapes.

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

[0120] The curling structure 712 of the embodiment of the present application may be formed by bending and connecting a plurality of straight wall sections, or may be a curved wall structure, or may be a structure combining a straight wall and a curved wall.

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

[0122] The curling structure 712 extends from the first end plate 71 to the second end plate 72 , that is, the curling structure 712 protrudes from the first plate body 711 , thereby forming a receiving space together with the first plate body 711 .

[0123] In the embodiment of the present application, the second end plate 72 and at least one curling structure 712 are offset or arranged with a gap in the first direction X, that is, the part of the curling structure 712 protruding from the first plate body 711 and the part of the second end plate located in the accommodating space are arranged along the first direction X, and the two are offset or have a gap.

[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 the embodiment of the present application is provided with a first end plate 71 and a second end plate 72 that fit together, and a curling structure 712 is provided at each end of the first plate body 711 along the first direction X. The two curling structures 712 and the first plate body 711 are surrounded by a accommodating space, and at least a portion of the second end plate 72 is located in the accommodating space and is abutted against or gapped with at least one curling structure 712 in the first direction. In this way, the second end plate can support at least one curling structure 712 in the first direction X, reduce the deformation of the curling structure 712 in the first direction X, thereby improving the supporting capacity of the first end plate 71 in the first direction X, and then reduce the deformation of the expansion-limiting structure such as the limiting belt 8 in the second direction Y of the battery module 5, thereby improving the limiting effect of the end plate assembly 7 on the expansion of the battery cell 61, reducing the deformation of the battery cell 61, and improving the service life of the battery cell 61.

[0126] Figure 7 for Figure 5 A schematic structural diagram of the second end plate of the end cover assembly is shown.

[0127] See also Figure 7 In some embodiments, the second end plate 72 includes a second plate body 721 and a filling structure 722 connected to each other. The second plate body 721 is used to fit the battery cell 61. The filling structure 722 is arranged 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 accommodating space and fits the first plate body 711. The two curling structures 712 are located on both sides of the filling structure 722 in the first direction X. At least one curling structure 712 is arranged to abut or have a gap with the filling structure 722 in the first direction X.

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

[0129] The side of the second plate body 721 facing away from the filling structure 722 may be a flat surface, a curved surface, or a surface structure combining a flat surface or a curved surface.

[0130] The filling structure 722 of the embodiment of the present application may be a solid block structure or a hollow structure.

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

[0132] The filling structure 722 of the embodiment of the present application is attached to the first plate body 711 , and the two may be in direct contact or may be attached after sandwiching other interlayers.

[0133] The curling structure 712 and the filling structure 722 are arranged against each other or with a gap in the first direction X. That is, the portion of the curling structure 712 protruding from the first plate body 711 and the filling structure 722 are arranged along the first direction X, and the two are against each other or have a gap.

[0134] By providing a second plate body 721 for connecting the battery cell 61 , the filling structure 722 can be provided more flexibly, that is, a hollow structure, a solid structure or other structures can be used.

[0135] Optionally, the projection of the second plate body 721 on the filling structure 722 along the second direction Y covers the filling structure 722. In this way, the second plate body 721 has a larger area, which can increase the connection area with the battery cell 61 and improve the tightness of the connection with the battery cell 61. The second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72.

[0136] Optionally, the entire filling structure 722 is located in the accommodation space.

[0137] In some embodiments, the two curling structures 712 are respectively disposed against or with a gap between them and the filling structure 722 in the first direction X.

[0138] In the embodiment of the present application, one of the two curling structures 712 can be set with a gap with the filling structure 722, and the other can be offset against the filling structure 722; or both of the curling structures 712 can be offset against the filling structure 722, or both of the curling structures 712 can have a gap with the filling structure 722.

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

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

[0141] The curling structure 712 of the embodiment of the present application is connected to the second plate body 721. The two can be in direct contact or connected after sandwiching other sandwich structures. Exemplarily, the curling structure 712 and the second plate body 721 are bonded by the second adhesive layer 77. The two can also be connected by welding or other methods.

[0142] Such an arrangement can improve 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 an end cap assembly is shown.

[0144] See also Figure 8 In some embodiments, the curling structure 712 includes a first wall body 7121, a second wall body 7122 and a third wall body 7123 which are connected at an angle in sequence along its own bending direction. The first wall body 7121, the second wall body 7122 and the third wall body 7123 are arranged to form a accommodating cavity 7124. The first wall body 7121 and the third wall body 7123 are arranged relatively to each other along the second direction Y. The first wall body 7121 is connected to the first plate body 711. The end of the third wall body 7123 which is away from the second wall body 7122 is against the filling structure 722 or has a gap. 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 the embodiment of the present application are arranged to form a semi-annular structure. The embodiment of the present application does not limit the shape of the first wall 7121, the second wall 7122 or the third wall 7123, which can be a straight wall, a curved wall or an irregular wall combining a straight wall and a curved wall.

[0146] The first wall 7121 and the second wall 7122 as well as the second wall 7122 and the third wall 7123 in the embodiment of the present application may be connected at an acute angle, an obtuse angle or a right angle.

[0147] The first wall 7121 and the third wall 7123 of the embodiment of the present application are arranged relatively to each other along the second direction Y, which does not mean that the two must be parallel to each other, and one may also be inclined relative to the other.

[0148] The first wall 7121 and the first plate body 711 of the embodiment of the present application can be connected by welding or integral molding, etc. Exemplarily, the first wall 7121, the second wall 7122, the third wall 7123 and the first plate body 711 are integrally molded.

[0149] The second direction Y of the embodiment of the present application intersects with the first direction X. Further, the second direction Y is perpendicular to the first direction X.

[0150] The presence of the accommodating cavity 7124 can provide a better supporting force for the curling structure 712 in the second direction Y, reduce the deformation of the curling structure 712 in the second direction Y after being subjected to force, and provide good protection for the battery cell. In addition, when the limiting belt 8 is used to limit the expansion of the battery cell 61, the curling structure 712 can support and tension the limiting belt 8 in the second direction Y, improve the limiting effect of the limiting belt 8 on the expansion of the battery cell 61, and reduce the deformation of the battery cell 61.

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

[0152] The third wall 7123 of the embodiment of the present application is connected to the second plate body 721. The two can be in direct contact or connected after sandwiching other sandwich structures. Exemplarily, the third wall 7123 and the second plate body 721 are bonded by the second adhesive layer 77. The two can also be connected by welding or other methods.

[0153] Such an arrangement can improve 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 7121 protrudes from the first plate body 711 along the direction from the second end plate 72 to the first end plate 71 .

[0155] Specifically, at least part of the first wall 7121 protrudes from the first plate body 711. The first wall 7121 itself may be a curved wall or a bent wall, which is bent or folded so that part of the first wall 7121 protrudes from the first plate body 711; or the entire first wall 7121 is located on the side of the first plate body 711 away from the second end plate 72, or other situations may be possible.

[0156] When the limiting strip 8 is used in conjunction with the end plate assembly 7, it is configured such that when the battery cell 61 expands, the local pressure on the first plate body 711 in the second direction Y caused by the limiting strip 8 can be reduced, and the pressure can be evenly transferred to the first plate body 711 through the curling structure 712, thereby further improving the uniformity of the force on the first plate body 711 and reducing the deformation of the first plate body 711, thereby 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 the embodiment of the present application, 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, and the second wall 7122 itself may be a curved wall or a bent wall, and a portion of the second wall 7122 protrudes from the second end plate 72 after bending or folding; or the entire second wall 7122 protrudes from the second end plate 72 along the second direction Y, or other situations may be used.

[0159] When the limiting belt 8 is used in conjunction with the end plate assembly 7, since at least a portion 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 enhanced, and the pressure applied by the limiting belt 8 to the side area of ​​the module body 6 is reduced, thereby protecting the battery cell 61 and further tightening the limiting belt 8, thereby enhancing 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] The first wall 7121 and the second wall 7122 are configured to have a smooth transition, so that the limiting belt 8 contacts a smooth curved surface, which can reduce damage to the limiting belt 8.

[0162] In some embodiments, the curling structure 712 also includes at least one fourth wall 7125, which is connected to the third wall 7123 at an angle at at least one end in the third direction Z. The fourth wall covers at least part of the accommodating cavity 7124 and is 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.

[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] The fourth wall 7125 of the embodiment of the present application can be connected to the third wall 7123 at an acute angle, an obtuse angle or a right angle. For example, the fourth wall 7125 is connected to the third wall 7123 at a right angle. Further, the fourth wall 7125 and the third wall 7123 are smoothly transitioned.

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

[0167] The target connecting member in the embodiment of the present application may be a bolt, which passes through the first through hole 7126 of the fourth wall 7125 and is threadedly connected to the box body 21. Of course, other target connecting members may also be used.

[0168] A fourth wall 7125 is provided. At the end where the fourth wall 7125 is provided, there is no need to provide other transition connection components on the curling structure 712, so as to improve the problem of weak intermediate mechanical properties caused by adding transition connection components. The target connection component can directly pass through the fourth wall 7125, which is more convenient to use.

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

[0170] Optionally, the fourth wall 7125 is plate-shaped, and 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 curling structure 712, which further improves the problem of weak intermediate mechanical properties caused by adding transition connecting components. The target connecting part can be directly passed through the two fourth walls 7125 to achieve locking with the box body 21, which is more convenient to use.

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

[0173] With such arrangement, 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 of the end plate assembly 7 and the box body 21 .

[0174] Fig. 9 for Figure 5 A schematic structural diagram of the support member of the end cover assembly is shown.

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

[0176] The support member 73 of the embodiment of the present application may be a plate-shaped member, a strip-shaped member or a block-shaped member.

[0177] The support member 73 and the first wall body 7121 or the third wall body 7123 may be connected by means of clamping, bonding or welding.

[0178] When the limiting belt 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 supporting capacity of the curling structure 712 in the second direction Y can be improved, and the deformation of the curling structure 712 in the second direction Y after being subjected to force can be reduced, thereby improving the tensioning capacity of the curling structure 712 on the limiting belt 8 and improving 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 arranged 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 a second through hole 7127, and the protrusion 732 and the second through hole 7127 are plugged into each other.

[0180] In the embodiment of the present application, the number of the 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 plugged in one by one. Of course, two protrusions 732 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 plug-fitted, that is, the two are matched in size, so that the second through hole 7127 forms a limit effect on the protrusion 732, thereby reducing the displacement of the support member 73 during use.

[0182] The support member 73 and the curling structure 712 are plug-fitted to facilitate installation and disassembly.

[0183] In some embodiments, when the curling structure 712 includes a fourth wall body 7125, the fourth wall body 7125 protrudes from the first wall body 7121 along the second end plate 72 to the first end plate 71, and a plurality of protrusions 732 arranged on the support body 731 include a first protrusion 7321, and the first protrusion 7321 is plugged into and fits with the first wall body 7121 and protrudes from the first wall body 7121. The first protrusion 7321 and the fourth wall body 7125 are spaced apart and a limiting space for limiting the limiting belt 8 is formed therebetween.

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

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

[0186] Optionally, the support member 73 has two first protrusions 7321 that are plugged into the first wall body 7121, the number of the fourth wall bodies 7125 is two, the two fourth wall bodies 7125 are connected to the two opposite ends of the third wall body 7123 in the third direction Z, and the two fourth wall bodies 7125 cooperate with the two first protrusions 7321 one by one to form two limiting spaces, which are used to limit the upper and lower limiting belts 8.

[0187] Optionally, when the support member 73 has a plurality of protrusions 732 plugged into and mated with the first wall 7121 , among the plurality of protrusions 732 , except for the first protrusion 7321 , the other protrusions 732 are all located in the second through hole 7127 .

[0188] Such an arrangement enables the first protrusion 7321 and the fourth wall 7125 to limit the limiting belt 8, thereby reducing the possibility of the limiting belt 8 falling off.

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

[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 is 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 is more closely fitted to the surface of the battery cell 61, and the connection is more firmly established.

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

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

[0195] Optionally, the surface where the plurality of reinforcing ribs 7221 cooperate 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 the third direction Z and extend along the first direction X; the multiple second reinforcing ribs 7224 are arranged along the first direction X and extend along the third direction Z, and the multiple first reinforcing ribs 7223 and the multiple second reinforcing ribs 7224 are staggered.

[0197] The filling structure 722 is configured as a structure in which a plurality of reinforcing ribs 7221 are staggered with each other, and a plurality of grooves 7222 are formed around the second plate body 721, so that the weight of the second end plate 72 can be reduced and a lightweight design can be achieved.

[0198] In some embodiments, the reinforcing ribs 7221, the second plate body 721 and the first end plate 71 are surrounded to form a mounting cavity 78 for mounting the output pole base 9. Further optionally, the plurality of reinforcing ribs 7221 include a third reinforcing rib 7225 and a fourth reinforcing rib 7226 that are relatively arranged along the first direction X, the second plate body 721 and the first end plate 71 are relatively arranged along the 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 are surrounded to form a mounting cavity 78 with a quadrilateral opening.

[0199] The mounting cavity 78 is formed by surrounding, which can facilitate the installation of the output pole base 9 and play a limiting role therefor.

[0200] Further optionally, the third reinforcing rib 7225, the fourth reinforcing rib 7226 and the end surface of the first end plate 71 located at the opening of the installation cavity 78 are on the same plane. Such an arrangement can be adapted to the output pole base 9, making it more firmly installed.

[0201] Fig.10 Another structural schematic diagram of an end cap assembly provided in some embodiments of the present application; Fig.11 for Fig.10 Schematic diagram of the exploded structure of the end plate assembly shown.

[0202] See also Fig.10 and Fig.11 In some embodiments, the filling structure 722 is a solid structure.

[0203] The filling structure 722 of the embodiment of the present application is a solid structure, but a groove or hole structure may also be provided thereon, that is, 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 to suppress expansion to the battery cell 61 more evenly, reduce the local stress of the battery cell 61, and improve the uniformity of the force applied to the battery cell 61.

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

[0206] Optionally, the third direction Z is parallel to the arrangement direction of the top and bottom ends of the battery cells 61, wherein a pole is provided at the top of the battery cells 61. Further optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0207] Extending the curling structure 712 from one end of the first plate body 711 to the other end can not only improve the flexibility of the position setting of the limiting belt 8, but also the pressure exerted on the curling structure 712 can 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, and the second end plate 72 is attached to the substrate 7111 and the first protrusion 7112.

[0209] When there are multiple first convex portions 7112 in the embodiment of the present application, the shapes of the multiple first convex portions 7112 may be the same or different. The multiple first convex portions 7112 may be arranged in an array or in a disordered manner.

[0210] Optionally, the first end plate 71 is made of metal material and is formed by stamping in one piece, which can improve the manufacturing efficiency.

[0211] The second end plate 72 of the embodiment of the present application transmits the expansion force to the first end plate 71 after being subjected to the expansion force of the battery cell 61. The first end plate 71 combines with other deformation limiting structures such as the limiting belt 8 to limit 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 easy to bend. Therefore, it is not easy to deform compared to a flat plate structure. Therefore, when the battery cell 61 expands, the deformation of the battery cell 61 can be effectively limited, thereby reducing the deformation degree 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, and the multiple first protrusions 7112 are arranged at intervals along the third direction Z and extend along the first direction X. The third direction Z, the second direction Y and the first direction X intersect each other, 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 of the embodiment of the present application may extend along the first direction X to the entire substrate 7111 , or may 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] The plurality of first protrusions 7112 are arranged at intervals along the third direction Z and extend along the first direction X. The substrate 7111 is also extended along the first direction X. Thus, for the battery cells 61 whose top and bottom ends are arranged along the third direction Z, the expansion of the battery cells 61 can be well restricted. Specifically, it is found through experiments that the middle area of ​​the battery cells 61 along the first direction X is prone to expansion. Therefore, the first protrusions 7112 and the substrate 7111 are arranged to extend along the first direction X, which can better restrict the expansion of the battery cells 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 plug-fitted.

[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 of the embodiment of the present application can be a square rod or a pin rod, etc.

[0219] The sizes of the limiting protrusion 74 and the limiting hole 75 in the embodiment of the present application match.

[0220] The limiting protrusion 74 and the limiting hole 75 are provided to play a limiting role during the assembly process of the first end plate 71 and the second end plate 72 and the subsequent use process, 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 member.

[0222] Exemplarily, the second board body 721 may be made of plastic or an insulating composite material.

[0223] Further optionally, the filling structure 722 is an insulating member.

[0224] Setting the second plate body 721 as an insulating member 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 penetrating the first end plate 71 along the second direction Y, and the second end plate 72 is provided with a positioning groove 723 opening toward the first end plate 71 , and the positioning groove 723 is arranged opposite to and connected to the positioning hole 7129 .

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

[0227] The positioning hole 7129 and the positioning groove 723 are provided to be used for positioning the first end plate 71 and the second end plate 72 when the battery modules 5 are grouped, thereby improving the position 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 hoisting hole 7128 , and the hoisting hole 7128 is used when hoisting the battery module 5 .

[0229] The embodiment of the present application further provides a battery module 5, comprising the above-mentioned end plate assembly 7 and a module body 6. The module body 6 comprises a plurality of battery cells 61, and the plurality of battery cells 61 are sequentially arranged along the second direction Y. The end plate assembly 7 is arranged at least at one end of the module body 6 in the second direction Y, and the second direction Y 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 belt 8 , which sleeves the module body 6 and the end plate assembly 7 together.

[0231] The limiting belt 8 can be made of steel or other materials.

[0232] The module body 6 and the end plate assembly 7 are sleeved together by the limiting belt 8, which has a strong tensile strength, can effectively limit the expansion of the battery cell 61, and has a low manufacturing cost. In addition, the limiting belt 8 is connected to the end plate assembly 7 and the module body 6 by sleeve connection, which has simple installation steps and high production efficiency.

[0233] The embodiment of the present application further provides a battery 2, comprising the above-mentioned battery module 5.

[0234] The embodiment of the present application further provides an electrical device, comprising the above-mentioned battery 2, and the battery 2 is used to provide electrical energy.

[0235] See also Figure 4-Figure 11The embodiment of the present 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 curling structures 712. The two curling structures 712 are located at opposite ends of the first plate body 711 along the 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 away from the first end plate 71 is used to connect with the battery cell 61. The curling structure 712 extends from the first end plate 71 to the second end plate 72, and is surrounded by the first plate body 711 to form a receiving space. At least part of the second end plate 72 is located in the receiving space and attached to the first plate body 711. The second end plate 72 and at least one curling structure 712 are abutted or gapped in the first direction X, and the first direction X intersects with 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 each other. The second plate body 721 is used to fit the battery cell 61. The filling structure 722 is arranged 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 accommodation space and fits the first plate body 711. The two curling structures 712 are located on both sides of the filling structure 722 in the first direction X. The two curling structures 712 are respectively abutted or gapped with 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. The two curling structures 712 fit and connect to the opposite ends of the second plate body 721 along the first direction. The curling structure 712 includes a first wall 7121, a second wall 7122 and a third wall 7123 which are connected in sequence at an angle along the bending direction thereof. The first wall 7121, the second wall 7122 and the third wall 7123 are arranged to enclose a receiving cavity 7124. The first wall 7121 and the third wall 7123 are arranged opposite to each other along the second direction Y. The first wall 7121 is connected to the first plate body 711. One end of the third wall 7123 which is 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 part 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 part of the second wall 7122 protrudes from the second end plate 72 along the first direction X. The first wall 7121 smoothly transitions to the second wall 7122. The curling structure 712 further includes two fourth walls 7125, which are connected to the third wall 7123 at opposite ends in the third direction Z at an angle, and the fourth wall covers at least a portion of the accommodating cavity 7124 and is provided with a first through hole 7126 for the target connecting member to pass through, and the third direction Z, the first direction X and the second direction Y intersect each other.The projection of the fourth wall 7125 on the first wall 7121 along the third direction Z 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 accommodating 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. The first wall 7121 and the third wall 7123 are both provided with a second through hole 7127, and the protrusion 732 and the second through hole 7127 are plugged and matched. The fourth wall 7125 protrudes from the first wall 7121 along the second end plate 72 to the first end plate 71, and the plurality of protrusions 732 arranged on the support body 731 include a first protrusion 7321, the first protrusion 7321 is plugged and matched with the first wall 7121 and protrudes from the first wall 7121, the first protrusion 7321 and the fourth wall 7125 are arranged at intervals and a limiting space for limiting the limiting belt 8 is formed therebetween. The side of the second plate body 721 away from the filling structure 722 is a plane. The first plate body 711 has two ends facing each other in the third direction Z, and the curling structure 712 extends from one end of the first plate body 711 to the other end, and the first direction X and the third direction Z intersect. The first plate body 711 includes a substrate 7111 and a first convex portion 7112. The first convex portion 7112 protrudes from the substrate 7111 along the direction from the second end plate 72 to the first end plate 71. A concave space 7113 is formed on the side of the first convex portion 7112 facing the second end plate 72. The second end plate 72 is attached to the substrate 7111 and the first convex portion 7112. There are multiple first convex portions 7112. The multiple first convex portions 7112 are arranged at intervals along the third direction Z and extend along the first direction X. The third direction Z and the second direction Y intersect with 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 member. The filling structure 722 is an insulating member.

[0236] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0237] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements 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 the present application.

Claims

1. An end plate assembly, characterized in that: include: A first end plate, comprising a first plate body and two curling structures, wherein the two curling structures are located at opposite ends of the first plate body along a first direction; A second end plate, attached to the first plate body, wherein a side of the second end plate facing away from the first end plate is used for connecting with a battery cell; The curling structure extends from the first end plate to the second end plate, and is surrounded by the first plate body to form a receiving space. At least part of the second end plate is located in the receiving space and is attached to the first plate body. The second end plate and at least one of the curling structures are abutted against or gapped in the first direction, and the first direction intersects with the arrangement direction of the first end plate and the second end plate.

2. The end plate assembly according to claim 1, characterized in that: 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 arranged on a side of the second plate body facing the first end plate, at least part of the filling structure is located in the accommodating space and fits the first plate body, The two curling structures are located on both sides of the filling structure in the first direction, and at least one of the curling structures is disposed against or with a gap between the filling structure and the filling structure in the first direction.

3. The end plate assembly according to claim 2, characterized in that: The two curling structures are respectively arranged to abut against or have a gap with the filling structure in the first direction.

4. The end plate assembly according to claim 2, characterized in that: The second plate body protrudes from two opposite ends of the filling structure along the first direction, and the two curling structures are attached to and connected to two opposite ends of the second plate body along the first direction.

5. The end plate assembly according to claim 2, characterized in that: The curling structure includes a first wall body, a second wall body and a third wall body which are connected at an angle in sequence along its own bending direction. The first wall body, the second wall body and the third wall body are arranged to form a accommodating cavity. The first wall body and the third wall body are arranged opposite to each other along a second direction. The first wall body is connected to the first plate body. An end of the third wall body which is away from the second wall body is against the filling structure or has a gap. The second direction is parallel to the arrangement direction of the first end plate and the second end plate.

6. The end plate assembly according to claim 5, characterized in that: The second plate body protrudes from two 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.

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

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

9. The end plate assembly according to claim 5, characterized in that: The first wall body and the second wall body transition smoothly.

10. The end plate assembly according to any one of claims 5 to 9, characterized in that: The curling structure also includes at least one fourth wall body, which is connected to at least one end of the third wall body in the third direction at an angle, and the fourth wall body covers at least part of the accommodating cavity and is provided with a first through hole for the target connecting part to pass through, and the third direction, the first direction and the second direction intersect each other.

11. The end plate assembly according to claim 10, characterized in that: The number of the fourth walls is two, the two fourth walls are connected to two opposite ends of the third wall in the third direction, and the two first through holes are aligned along the third direction.

12. The end plate assembly according to claim 10, characterized in that The projection of the fourth wall on the first wall along the third direction covers at least a portion of the first wall, and abuts against or has a gap with an end of the first wall.

13. The end plate assembly according to any one of claims 5 to 12, characterized in that: It also includes a support member, at least a portion of which is located in the accommodating cavity and connected to the first wall body and the third wall body.

14. The end plate assembly according to claim 13, characterized in that The support member includes a support body and protrusions arranged on two opposite sides of the support body along the second direction. The first wall body and the third wall body are both provided with a second through hole, and the protrusion is plug-fitted into the second through hole.

15. The end plate assembly according to claim 14, characterized in that When the curling 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 arranged on the supporting body include a first protrusion, which is plugged into and fits with the first wall and protrudes from the first wall, and the first protrusion is spaced apart from the fourth wall to form a limiting space for limiting the limiting belt.

16. The end plate assembly according to any one of claims 2 to 15, characterized in that: A side of the second plate body facing away from the filling structure is a plane.

17. The end plate assembly according to any one of claims 2 to 16, characterized in that: The filling structure includes a plurality of reinforcing ribs arranged in an alternating manner, and the plurality of reinforcing ribs and the second plate body are arranged to form a plurality of grooves opening toward the first end plate.

18. The end plate assembly according to any one of claims 2 to 16, characterized in that: The filling structure is a solid structure.

19. The end plate assembly according to any one of claims 1 to 18, characterized in that: The first plate body has two ends facing each other in a third direction, the curling structure extends from one end of the first plate body to the other end, and the first direction intersects with the third direction.

20. The end plate assembly according to any one of claims 1 to 19, characterized in that: The first plate body includes a base plate and a first protrusion, the first protrusion protrudes from the base plate 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, and the second end plate is attached to the base plate and the first protrusion.

21. The end plate assembly according to claim 20, characterized in that There are multiple first protrusions, which are spaced apart along a third direction and extend along the first direction. The third direction and the second direction intersect with 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.

22. The end plate assembly according to any one of claims 1 to 21, 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, and the limiting protrusion and the limiting hole are plug-fitted.

23. The end plate assembly according to claim 2, characterized in that The second plate body is an insulating member.

24. A battery module, characterized in that: include: The end plate assembly according to any one of claims 1 to 23; The module body includes a plurality of battery cells, which are arranged in sequence along a second direction. The end plate assembly is arranged at least at 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.

25. The battery module according to claim 24, characterized in that: It also includes a limiting belt, which sleeves the module body and the end plate assembly together.

26. A battery, characterized in that: Comprising the battery module as claimed in claim 24 or 25.

27. An electrical device, characterized in that: Comprising a battery as claimed in claim 26, the battery is used to provide electrical energy.

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