Battery module, battery and electric device

Abstract

The embodiment of the utility model provides a battery module, a battery and a power utilization device, the battery module comprises a battery unit, a first end plate, a second end plate, a first side plate and a second side plate, the battery unit comprises at least one battery monomer, and the first end plate and the second end plate are located at two opposite ends of the battery unit along a first direction; the first side plate and the second side plate are located on the two opposite sides of the battery unit in the second direction, the second direction intersects with the first direction, the first end plate, the first side plate, the second end plate and the second side plate are sequentially connected and define a frame structure for containing the battery unit, and the first end plate and the first side plate are integrally formed. The first side plate and the second end plate are two split parts, and the first end plate and the second side plate are two split parts. The production efficiency of the battery can be improved.

Description

Technical Field

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

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

[0003] In the development of battery technology, how to improve battery production efficiency is a research direction in battery technology. Utility Model Content

[0004] The present application provides a battery module, a battery and an electrical device, which can improve the production efficiency of the battery.

[0005] An embodiment of the present application provides a battery module, including a battery cell, a first end plate, a second end plate, a first side plate and a second side plate, the battery cell including at least one battery cell, the first end plate and the second end plate are located at opposite ends of the battery cell along a first direction, the first side plate and the second side plate are located at opposite sides of the battery cell along a second direction, the second direction intersects with the first direction, the first end plate, the first side plate, the second end plate and the second side plate are sequentially connected and surrounded to form a frame structure for accommodating the battery cell, the first end plate and the first side plate are integrally formed, the first side plate and the second end plate are two separate components, and the first end plate and the second side plate are two separate components.

[0006] In the above technical solution, the battery module of the embodiment of the present application reduces the number of connections by setting the first end plate and the first side plate as an integral part, thereby improving the production efficiency of the battery. In addition, setting the first side plate and the second end plate as two separate parts, and setting the first end plate and the second side plate as two separate parts can reduce the difficulty of integral molding.

[0007] In some embodiments, the second side plate and the second end plate are integrally formed.

[0008] In the above technical solution, the second side plate and the second end plate are configured to be integrally formed, so the number of connections among the first end plate, the first side plate, the second end plate and the second side plate is two, which reduces the number of connections and further improves the production efficiency of the battery.

[0009] In some embodiments, the first side plate includes a first plate body and a first edge package, the first plate body is attached to the battery cell, the first edge package is located at an end of the first plate body away from the first end plate, and is connected to the first plate body at an angle, the first plate body is connected to the end face of the second end plate, and / or the first edge package is connected to the surface of the second end plate away from the first end plate.

[0010] In the above technical solution, the first side plate of the embodiment of the present application is provided with a first edge wrapping, so that when the battery cell expands along the first direction, the second end plate can limit the battery cell and reduce the expansion of the battery cell.

[0011] In some embodiments, a surface of the second end plate facing away from the first end plate is recessed inward to form a first recess, and at least a portion of the first edge wrap is located in the first recess.

[0012] In the above technical solution, a first recess is provided on the second end plate, which can accommodate at least a portion of the first edge package and reduce the protrusion of the first edge package relative to the second end plate.

[0013] In some embodiments, the second side plate includes a second plate body and a second edge package, the second plate body is attached to the battery cell, the second edge package is located at an end of the second plate body away from the second end plate, and is connected to the second plate body at an angle, the second plate body is connected to the end face of the first end plate, and / or the second edge package is connected to the surface of the first end plate away from the second end plate.

[0014] In the above technical solution, the second side plate of the embodiment of the present application can limit the battery cell through the first end plate when the battery cell expands along the first direction by setting the second edge, thereby reducing the expansion of the battery cell.

[0015] In some embodiments, a surface of the first end plate facing away from the second end plate is recessed inward to form a second recess, and at least a portion of the second edge is located in the second recess.

[0016] In the above technical solution, a second recess is provided on the first end plate to accommodate at least a portion of the second edge package, thereby reducing the protrusion of the second edge package relative to the first end plate.

[0017] In some embodiments, the first side plate includes a first plate body and a first edge, the first plate body is attached to the battery cell, the first edge is located at an end of the first plate body away from the first end plate, and is connected to the first plate body at an angle, the first plate body is connected to the end surface of the second end plate, and / or the first edge is connected to the surface of the second end plate away from the first end plate. The surface of the second end plate away from the first end plate is recessed inward to form a first recess, and at least a portion of the first edge is located in the first recess.

[0018] In the above technical solution, the first side plate of the embodiment of the present application is provided with a first edge wrapping, and when the battery cell expands along the first direction, the second end plate can further limit the battery cell, thereby reducing the expansion of the battery cell. The first recess is provided on the second end plate, which can accommodate at least part of the first edge wrapping, thereby reducing the protrusion of the first edge wrapping relative to the second end plate.

[0019] In some embodiments, the bottom surface of the first recess is connected to the end surface of the second end plate at an angle and smoothly transitions, wherein the bottom surface of the first recess intersects the first direction; and / or, the bottom surface of the second recess is connected to the end surface of the first end plate at an angle and smoothly transitions, wherein the bottom surface of the second recess intersects the first direction.

[0020] When the battery unit has a larger overall size along the first direction due to manufacturing tolerance, the rounded corners can play a guiding role, thereby facilitating the first edge to be guided into the first recess for assembly connection.

[0021] When the battery unit has a larger overall size along the first direction due to manufacturing tolerance, the rounded corners can play a guiding role, thereby facilitating the second edge to be guided into the second recess for assembly connection.

[0022] In some embodiments, along the second direction, the maximum dimension of the first edge is smaller than the maximum dimension of the first recess; and / or, along the second direction, the maximum dimension of the second edge is smaller than the maximum dimension of the second recess.

[0023] The maximum dimension of the first edge package is set to be smaller than the maximum dimension of the first recess, so that when there is a manufacturing tolerance between the first edge package and the first recess, the first edge package can also cooperate with the first recess.

[0024] The maximum dimension of the second edge package is set to be smaller than the maximum dimension of the second recess, so that when there is a manufacturing tolerance between the second edge package and the second recess, the second edge package can also cooperate with the second recess.

[0025] In some embodiments, the first end plate and the second end plate are both provided with connection holes penetrating through them along a third direction, the connection holes are used to connect to the bottom plate of the box body in the battery, and the third direction, the first direction and the second direction intersect each other.

[0026] In the above technical solution, connection holes are provided on the first end plate and the second end plate, and the first end plate and the second end plate can be completely fixed to the bottom plate of the box body through the connection holes, thereby improving the tightness of the connection between the battery module and the box body.

[0027] In some embodiments, at least one of the first end plate and the second end plate is provided with a plurality of weight-reducing holes penetrating the end plate along a third direction, and the third direction, the first direction, and the second direction intersect each other.

[0028] In the above technical solution, the weight-reducing holes are provided to reduce the weight of the first end plate or the second end plate, thereby improving the energy density of the battery module.

[0029] In some embodiments, the cross-sectional area of ​​the first end plate in the third direction is S1, the first end plate is provided with weight reduction holes, and the total cross-sectional area of ​​the multiple weight reduction holes on the first end plate in the third direction is S2, wherein S1 and S2 satisfy: 60%≤S2 / S1≤90%.

[0030] In the above technical solution, the value of S2 / S1 is limited to greater than or equal to 60% to further reduce the weight of the first end plate; the value of S2 / S1 is limited to less than or equal to 90% so that the structural strength of the first end plate can meet the requirements.

[0031] In some embodiments, the cross-sectional area of ​​the second end plate in the third direction is S3, the second end plate is provided with weight reduction holes, and the total cross-sectional area of ​​the multiple weight reduction holes on the second end plate in the third direction is S4, wherein S3 and S4 satisfy: 60%≤S4 / S3≤90%.

[0032] In the above technical solution, the value of S4 / S3 is limited to greater than or equal to 60% to further reduce the weight of the second end plate; the value of S4 / S3 is limited to less than or equal to 90% so that the structural strength of the second end plate can meet the requirements.

[0033] In a second aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery module.

[0034] In a third 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

[0035] 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.

[0036] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0037] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0038] Figure 3 A schematic diagram of the exploded structure of a battery module provided in some embodiments of the present application;

[0039] Figure 4 for Figure 3 A partial structural schematic diagram of a battery module shown;

[0040] Figure 5 for Figure 4 Schematic diagram of the partial structure of the battery module shown.

[0041] The reference numerals of the specific embodiments are as follows:

[0042] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Battery module; 6. Box; 61. First part; 62. Second part;

[0043] 51. battery unit; 511. battery monomer;

[0044] 52. First end plate; 521. Second recess;

[0045] 53. Second end plate; 531. First recess;

[0046] 54, first side plate; 541, first plate body; 542, first edge wrapping;

[0047] 55, second side plate; 551, second plate body; 552, second edge wrapping;

[0048] 56. Connecting hole;

[0049] 57. Weight reduction hole;

[0050] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The term "plurality" used in the present application refers to two or more (including two).

[0058] 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.

[0059] 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.

[0060] 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.

[0061] A battery module generally includes a battery cell, two side plates and two end plates, and the two side plates and the two end plates are arranged to form a frame structure for accommodating the battery cell. When the side plates and the end plates are connected, the two end plates and the two side plates are independent plates, so there are four connection points in total. The number of connection points is large, resulting in low production efficiency.

[0062] In view of this, the present application provides a battery module, which reduces the number of connections by integrally forming one of the end plates and one of the side plates, thereby improving the production efficiency of the battery.

[0063] The battery module described in the embodiments of the present application is suitable for batteries and electrical devices using batteries.

[0064] 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.

[0065] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0066] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0067] 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.

[0068] 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 .

[0069] 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.

[0070] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application.

[0071] like Figure 2 As shown, the battery 2 includes a box body 6 and a battery module 5. The box body 6 has a receiving space, and the battery module 5 is arranged in the receiving space.

[0072] Exemplarily, the box body 6 may include a first part 61 and a second part 62, the first part 61 and the second part 62 cover each other, and the first part 61 and the second part 62 jointly define a storage space for accommodating the battery module 5. The second part 62 may be a hollow structure with one end open, and the first part 61 may be a plate-like structure, and the first part 61 covers the open side of the second part 62, so that the first part 61 and the second part 62 jointly define a storage space; the first part 61 and the second part 62 may also be hollow structures with one side open, and the open side of the first part 61 covers the open side of the second part 62. Of course, the box body 6 formed by the first part 61 and the second part 62 may be in various shapes, such as a cylinder, a cuboid, etc.

[0073] In the battery 2 , there may be one or more battery modules 5 . The multiple battery modules 5 may be connected in series, in parallel, or in mixed series to form a whole, and fixed to the box 6 .

[0074] Figure 3 A schematic diagram of the exploded structure of a battery module provided in some embodiments of the present application.

[0075] like Figure 3 As shown, the present application also provides a battery module 5, including a battery cell 51, a first end plate 52, a second end plate 53, a first side plate 54 and a second side plate 55. The battery cell 51 includes at least one battery cell 511; the first end plate 52 and the second end plate 53 are located at opposite ends of the battery cell 51 along the first direction X; the first side plate 54 and the second side plate 55 are located at opposite sides of the battery cell 51 along the second direction Y, and the second direction Y intersects with the first direction X; the first end plate 52, the first side plate 54, the second end plate 53 and the second side plate 55 are sequentially connected and surrounded to form a frame structure for accommodating the battery cell 51, the first end plate 52 and the first side plate 54 are integrally formed, the first side plate 54 and the second end plate 53 are two separate parts, and the first end plate 52 and the second side plate 55 are two separate parts.

[0076] In the battery unit 51, there may be one or more battery cells 511. Multiple battery cells 511 may be connected in series, in parallel, or in mixed connection. Each battery cell 511 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 511 may be cylindrical, flat, rectangular, or in other shapes.

[0077] Optionally, the plurality of battery cells 511 are arranged along the first direction X.

[0078] The first end plate 52 of the embodiment of the present application is located at one end of the battery unit 51 in the first direction X, and the second end plate 53 is located at the other end of the battery unit 51 in the first direction X. The first side plate 54 is located on one side of the battery unit 51 in the second direction Y, and the second side plate 55 is located on the other side of the battery unit 51 in the second direction Y.

[0079] The first end plate 52, the first side plate 54, the second end plate 53, and the second side plate 55 of the embodiment of the present application are sequentially connected and arranged to form a frame structure, wherein the second side plate 55 and the first end plate 52 are also connected to form a frame structure. Exemplarily, the first end plate 52, the first side plate 54, the second end plate 53, and the second side plate 55 are sequentially connected and arranged to form a rectangular frame structure, and can also be arranged to form other shapes, such as a trapezoidal frame structure.

[0080] Optionally, the second direction Y is perpendicular to the first direction X.

[0081] The first side plate 54 and the second end plate 53 of the embodiment of the present application are two separate parts, which means that the first side plate 54 and the second end plate 53 are not integrally formed, but are two separately formed parts connected together by other connection means. Similarly, the first end plate 52 and the second side plate 55 are two separate parts, which means that the first end plate 52 and the second side plate 55 are not integrally formed, but are two separately formed parts connected together by other connection means.

[0082] The second side plate 55 and the second end plate 53 of the embodiment of the present application may be integrally formed or may be two separate components.

[0083] The two separately formed parts of the first end plate 52 , the first side plate 54 , the second end plate 53 and the second side plate 55 in the embodiment of the present application can be connected by welding, threading or riveting.

[0084] Illustratively, the first side plate 54 of the embodiment of the present application may be a flat plate structure, and the second side plate 55 may be a flat plate structure.

[0085] Exemplarily, the first end plate 52 and the second end plate 53 may be connected to the bottom plate of the box body 6 by riveting or bonding.

[0086] The first end plate 52, the second end plate 53, the first side plate 54 and the second side plate 55 of the embodiment of the present application can be made of metal materials or non-metal composite materials. Among them, the integrally formed first end plate 52 and the first side plate 54 are made of the same material.

[0087] The number of connection points of the battery module 5 in the embodiment of the present application is three or two. Among them, the second side plate 55 and the second end plate 53 are integrally formed, and the number of connection points is two.

[0088] The battery module 5 of the embodiment of the present application reduces the number of connections by configuring the first end plate 52 and the first side plate 54 to be integrally formed, thereby improving the production efficiency of the battery 2. In addition, configuring the first side plate 54 and the second end plate 53 to be two separate components, and configuring the first end plate 52 and the second side plate 55 to be two separate components, can reduce the difficulty of integrally forming.

[0089] In some embodiments, the second side plate 55 and the second end plate 53 are integrally formed.

[0090] The second side plate 55 and the second end plate 53 are integrally formed, so that the number of connection points among the first end plate 52, the first side plate 54, the second end plate 53 and the second side plate 55 is two, which reduces the number of connection points and further improves the production efficiency of the battery 2.

[0091] Figure 4 for Figure 3 A partial structural schematic diagram of the battery module shown.

[0092] See also Figure 4 In some embodiments, the first side plate 54 includes a first plate body 541 and a first edge package 542. The first plate body 541 is attached to the battery cell 51. The first edge package 542 is located at an end of the first plate body 541 that is away from the first end plate 52, and is connected to the first plate body 541 at an angle. The first plate body 541 is connected to the end surface of the second end plate 53, and / or the first edge package 542 is connected to the surface of the second end plate 53 that is away from the first end plate 52.

[0093] The first plate body 541 may be attached to the battery unit 51 through other buffer members, or may be directly attached to the battery unit 51. Exemplarily, the first plate body 541 of the embodiment of the present application is a flat plate structure.

[0094] The first edge 542 of the embodiment of the present application is bent from the first plate body 541 toward the second end plate 53, and the two can be connected at an obtuse angle, an acute angle, or a right angle. Optionally, the first plate body 541 is connected to the first edge 542 at a right angle. Further optionally, the first plate body 541 and the first edge 542 are smoothly transitioned at the right-angle connection.

[0095] The end surface of the second end plate 53 in the embodiment of the present application refers to the surface of the second end plate 53 facing the first plate body 541 , which intersects with the second direction Y. The first plate body 541 can be connected to the end surface of the second end plate 53 by welding, threading or riveting.

[0096] The first edge package 542 of the embodiment of the present application is connected to the surface of the second end plate 53 facing away from the first end plate 52 , and the two can be connected by bonding or welding.

[0097] The surface of the second end plate 53 facing away from the first end plate 52 in the embodiment of the present application may be a plane.

[0098] The first side plate 54 of the embodiment of the present application is provided with the first edge 542 , so that when the battery cell 511 expands along the first direction X, the second end plate 53 can limit the battery cell 511 and reduce the expansion of the battery cell 511 .

[0099] In some embodiments, the surface of the second end plate 53 facing away from the first end plate 52 is recessed inward to form a first recess 531 , and at least a portion of the first edge package 542 is located in the first recess 531 .

[0100] The bottom surface of the first recess 531 of the embodiment of the present application intersects with the first direction X, and the first recess 531 has only one side surface that faces the first edge 542 and intersects with the second direction Y. When the first edge 542 is connected to the second end plate 53, it means that the bottom surface of the first recess 531 is connected to the first edge 542, and the side surface of the first recess 531 can be connected to the first edge 542 or spaced apart from the first edge 542.

[0101] Optionally, the first edge 542 is completely located in the first recess 531 .

[0102] The first recess 531 is provided on the second end plate 53 to accommodate at least part of the first edge 542, thereby reducing the protrusion of the first edge 542 relative to the second end plate 53. Furthermore, when the first edge 542 and the second end plate 53 are connected by welding, the provision of the first recess 531 can also facilitate the welding process of the two.

[0103] In some embodiments, the second side plate 55 includes a second plate body 551 and a second edging 552, the second plate body 551 is attached to the battery cell 51, the second edging 552 is located at an end of the second plate body 551 facing away from the second end plate 53, and is connected to the second plate body 551 at an angle, the second plate body 551 is connected to the end face of the first end plate 52, and / or the second edging 552 is connected to the surface of the first end plate 52 facing away from the second end plate 53.

[0104] The second plate body 551 may be attached to the battery unit 51 through other buffer members, or may be directly attached to the battery unit 51. For example, the second plate body 551 of the embodiment of the present application is a flat plate structure.

[0105] The second edge 552 of the embodiment of the present application is bent from the second plate body 551 toward the first end plate 52, and the two can be connected at an obtuse angle, an acute angle or a right angle. Optionally, the second plate body 551 is connected to the second edge 552 at a right angle. Further optionally, the second plate body 551 and the second edge 552 are smoothly transitioned at the right-angle connection.

[0106] The end surface of the first end plate 52 in the embodiment of the present application refers to the surface of the first end plate 52 facing the second plate body 551, which intersects with the second direction Y. The second plate body 551 can be connected to the end surface of the first end plate 52 by welding, threading or riveting.

[0107] The second edge package 552 of the embodiment of the present application is connected to the surface of the first end plate 52 facing away from the second end plate 53 , and the two can be connected by bonding or welding.

[0108] The surface of the first end plate 52 facing away from the second end plate 53 in the embodiment of the present application may be a plane.

[0109] The second side plate 55 of the embodiment of the present application is provided with the second edge 552 , so that when the battery cell 511 expands along the first direction X, the first end plate 52 can limit the battery cell 511 and reduce the expansion of the battery cell 511 .

[0110] In some embodiments, the surface of the first end plate 52 facing away from the second end plate 53 is recessed inward to form a second recess 521 , and at least a portion of the second edge covering 552 is located in the second recess 521 .

[0111] The bottom surface of the second recess 521 of the embodiment of the present application intersects with the first direction X, and the second recess 521 has only one side surface that faces the second edge 552 and intersects with the second direction Y. When the second edge 552 is connected to the first end plate 52, it means that the bottom surface of the second recess 521 is connected to the second edge 552, and the side surface of the second recess 521 can be connected to the second edge 552 or can be spaced apart from the second edge 552.

[0112] Optionally, the second edge 552 is completely located in the second recess 521 .

[0113] The second recess 521 is provided on the first end plate 52 to accommodate at least part of the second edge 552, thereby reducing the protrusion of the second edge 552 relative to the first end plate 52. Furthermore, when the second edge 552 and the first end plate 52 are connected by welding, the provision of the second recess 521 can also facilitate the welding process of the two.

[0114] In some embodiments, the first side plate 54 includes a first plate body 541 and a first edge 542, the first plate body 541 is attached to the battery cell 51, the first edge 542 is located at one end of the first plate body 541 away from the first end plate 52, and is connected to the first plate body 541 at an angle, the first plate body 541 is connected to the end surface of the second end plate 53, and / or the first edge 542 is connected to the surface of the second end plate 53 away from the first end plate 52. The surface of the second end plate 53 away from the first end plate 52 is recessed inward to form a first recessed portion 531, and at least a portion of the first edge 542 is located in the first recessed portion 531.

[0115] The first side plate 54 of the embodiment of the present application is provided with a first edge 542, so that when the battery cell 511 expands along the first direction X, the second end plate 53 can further limit the battery cell 511, thereby reducing the expansion of the battery cell 511. The second end plate 53 is provided with a first recess 531, which can accommodate at least part of the first edge 542, thereby reducing the protrusion of the first edge 542 relative to the second end plate 53.

[0116] Figure 5 for Figure 4 Schematic diagram of the partial structure of the battery module shown.

[0117] See also Figure 5 In some embodiments, the bottom surface of the first recess 531 is connected to the end surface of the second end plate 53 at an angle and smoothly transitions, wherein the bottom surface of the first recess 531 intersects with the first direction X; and / or, the bottom surface of the second recess 521 is connected to the end surface of the first end plate 52 at an angle and smoothly transitions, wherein the bottom surface of the second recess 521 intersects with the first direction X.

[0118] The bottom surface of the first recess 531 may be connected to the end surface of the second end plate 53 at an acute angle, an obtuse angle or a right angle. Optionally, the bottom surface of the first recess 531 is connected to the end surface of the second end plate 53 at a right angle and forms a rounded corner.

[0119] The bottom surface of the second recess 521 may be connected to the end surface of the first end plate 52 at an acute angle, an obtuse angle or a right angle. Optionally, the bottom surface of the second recess 521 is connected to the end surface of the first end plate 52 at a right angle and forms a rounded corner.

[0120] In this way, when the battery unit 51 has a larger overall size along the first direction X due to manufacturing tolerance, the presence of the rounded corners can play a guiding role, thereby facilitating the first edge 542 to be guided into the first recess 531 for assembly connection.

[0121] In this way, when the battery unit 51 has a larger overall size along the first direction X due to manufacturing tolerance, the existence of the rounded corners can play a guiding role, thereby facilitating the second edge 552 to be guided into the second recess 521 for assembly connection.

[0122] In some embodiments, along the second direction Y, the maximum dimension of the first edge 542 is smaller than the maximum dimension of the first recess 531 ; and / or, along the second direction Y, the maximum dimension of the second edge 552 is smaller than the maximum dimension of the second recess 521 .

[0123] The maximum size of the first edge package 542 is set to be smaller than the maximum size of the first recess 531 , so that when there is a manufacturing tolerance between the first edge package 542 and the first recess 531 , the first edge package 542 can also cooperate with the first recess 531 .

[0124] The maximum size of the second edge package 552 is set to be smaller than the maximum size of the second recess 521 , so that when there is a manufacturing tolerance between the second edge package 552 and the second recess 521 , the second edge package 552 can also cooperate with the second recess 521 .

[0125] In some embodiments, the first end plate 52 and the second end plate 53 are both provided with a connection hole 56 passing through themselves along the third direction Z, and the connection hole 56 is used to connect with the bottom plate of the box 6 in the battery 2. The third direction Z, the first direction X and the second direction Y intersect each other.

[0126] The number of the connecting holes 56 of the first end plate 52 is at least one, and the number of the connecting holes 56 of the second end plate 53 is at least one. Optionally, the number of the connecting holes 56 of the first end plate 52 is two, and the two connecting holes 56 are located at opposite ends of the first end plate 52 in the second direction Y. The number of the connecting holes 56 of the second end plate 53 is two, and the two connecting holes 56 are located at opposite ends of the second end plate 53 in the second direction Y.

[0127] The connection holes 56 of this embodiment can be used in the threaded connection process between the first end plate 52, the second end plate 53 and the bottom plate of the box body 6. Of course, the connection holes 56 can also be used to rivet the bottom plate of the box body 6.

[0128] Optionally, the third direction Z, the first direction X, and the second direction Y are perpendicular to each other.

[0129] The first end plate 52 and the second end plate 53 are provided with connection holes 56 , through which the first end plate 52 and the second end plate 53 can be completely fixed to the bottom plate of the box body 6 , thereby improving the tightness of the connection between the battery module 5 and the box body 6 .

[0130] In some embodiments, at least one of the first end plate 52 and the second end plate 53 is provided with a plurality of weight-reducing holes 57 penetrating the first end plate 52 and the second end plate 53 along the third direction Z, and the third direction Z, the first direction X, and the second direction Y intersect each other.

[0131] The shape of the weight-reducing holes 57 in the embodiment of the present application can be circular, triangular, parallelogram or irregular. In the first end plate 52, the shapes of the plurality of weight-reducing holes 57 can be completely the same, or different, or only a part of the weight-reducing holes 57 can have the same shape. The shape of the weight-reducing holes 57 in the second end plate 53 is also the same, and the present application will not repeat it here.

[0132] The plurality of weight-reducing holes 57 in the embodiment of the present application may be randomly arranged or arranged in an array. Optionally, in the first end plate 52 or the second end plate 53, the plurality of weight-reducing holes 57 are arranged at intervals along the second direction Y.

[0133] Optionally, the first end plate 52 and the second end plate 53 are both provided with a plurality of weight-reducing holes 57 penetrating through the first end plate 52 and the second end plate 53 along the third direction Z.

[0134] Optionally, the third direction Z, the first direction X, and the second direction Y are perpendicular to each other.

[0135] The weight-reducing holes 57 are provided to reduce the weight of the first end plate 52 or the second end plate 53 , thereby improving the energy density of the battery module 5 .

[0136] In some embodiments, the cross-sectional area of ​​the first end plate 52 in the third direction Z is S1, the first end plate 52 is provided with a weight-reducing hole 57, and the total cross-sectional area of ​​the multiple weight-reducing holes 57 on the first end plate 52 in the third direction Z is S2, wherein S1 and S2 satisfy: 60%≤S2 / S1≤90%.

[0137] Optionally, the value of S2 / S1 may be 60%, 70%, 75%, 80%, 85% or 90%.

[0138] The value of S2 / S1 is limited to be greater than or equal to 60% to further reduce the weight of the first end plate 52; the value of S2 / S1 is limited to be less than or equal to 90% to ensure that the structural strength of the first end plate 52 can meet the requirements.

[0139] In some embodiments, the cross-sectional area of ​​the second end plate 53 in the third direction Z is S3, the second end plate 53 is provided with a weight-reducing hole 57, and the total cross-sectional area of ​​the multiple weight-reducing holes 57 on the second end plate 53 in the third direction Z is S4, wherein S3 and S4 satisfy: 60%≤S4 / S3≤90%.

[0140] Optionally, the value of S4 / S3 may be 60%, 70%, 75%, 80%, 85% or 90%.

[0141] The value of S4 / S3 is limited to be greater than or equal to 60% to further reduce the weight of the second end plate 53; the value of S4 / S3 is limited to be less than or equal to 90% to ensure that the structural strength of the second end plate 53 can meet the requirements.

[0142] The embodiment of the present application further provides a battery 2, comprising the above-mentioned battery module 5.

[0143] The embodiment of the present application also provides an electrical device, comprising the above-mentioned battery 2.

[0144] See also Figure 2-Figure 4 The embodiment of the present application provides a battery module 5, including a battery cell 51, a first end plate 52, a second end plate 53, a first side plate 54 and a second side plate 55. The battery cell 51 includes at least one battery cell 511; the first end plate 52 and the second end plate 53 are located at opposite ends of the battery cell 51 along the first direction X; the first side plate 54 and the second side plate 55 are located at opposite sides of the battery cell 51 along the second direction Y, and the second direction Y intersects with the first direction X; the first end plate 52, the first side plate 54, the second end plate 53 and the second side plate 55 are sequentially connected and surrounded to form a frame structure for accommodating the battery cell 51, the first end plate 52 and the first side plate 54 are integrally formed, the first side plate 54 and the second end plate 53 are two separate components, and the first end plate 52 and the second side plate 55 are two separate components. The second side plate 55 and the second end plate 53 are integrally formed. The first side plate 54 includes a first plate body 541 and a first edge 542. The first plate body 541 is attached to the battery cell 51. The first edge 542 is located at one end of the first plate body 541 away from the first end plate 52 and is connected to the first plate body 541 at an angle. The first edge 542 is connected to the surface of the second end plate 53 away from the first end plate 52. The surface of the second end plate 53 away from the first end plate 52 is recessed inward to form a first recessed portion 531. At least part of the first edge 542 is located in the first recessed portion 531. The second side plate 55 includes a second plate body 551 and a second edge 552. The second plate body 551 is attached to the battery cell 51. The second edge 552 is located at one end of the second plate body 551 away from the second end plate 53 and is connected to the second plate body 551 at an angle. The second edge 552 is connected to the surface of the first end plate 52 away from the second end plate 53. The surface of the first end plate 52 facing away from the second end plate 53 is recessed inward to form a second recess 521 , and at least a portion of the second edge covering 552 is located in the second recess 521 .

[0145] 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.

[0146] 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. A battery module, characterized in that: include: A battery unit, comprising at least one battery cell; A first end plate and a second end plate are located at opposite ends of the battery unit along a first direction; A first side plate and a second side plate, located at opposite sides of the battery unit along a second direction, wherein the second direction intersects the first direction; The first end plate, the first side plate, the second end plate and the second side plate are connected in sequence and arranged to form a frame structure for accommodating the battery cell, the first end plate and the first side plate are integrally formed, the first side plate and the second end plate are two separate components, and the first end plate and the second side plate are two separate components.

2. The battery module according to claim 1, characterized in that: The second side plate and the second end plate are integrally formed.

3. The battery module according to claim 1, characterized in that: The first side plate includes a first plate body and a first edge, the first plate body is attached to the battery unit, the first edge is located at an end of the first plate body away from the first end plate, and is connected to the first plate body at an angle. The first plate body is connected to an end surface of the second end plate, and / or the first edge package is connected to a surface of the second end plate facing away from the first end plate.

4. The battery module according to claim 3, characterized in that: The surface of the second end plate facing away from the first end plate is recessed inward to form a first recess, and at least a portion of the first edge wrap is located in the first recess.

5. The battery module according to claim 2, characterized in that: The second side plate includes a second plate body and a second edging, the second plate body is attached to the battery cell, the second edging is located at an end of the second plate body away from the second end plate, and is connected to the second plate body at an angle, the second plate body is connected to the end face of the first end plate, and / or the second edging is connected to the surface of the first end plate away from the second end plate.

6. The battery module according to claim 5, characterized in that: The surface of the first end plate facing away from the second end plate is recessed inward to form a second recess, and at least a portion of the second edge wrap is located in the second recess.

7. The battery module according to claim 6, characterized in that: The first side plate includes a first plate body and a first edge, the first plate body is attached to the battery unit, the first edge is located at an end of the first plate body away from the first end plate, and is connected to the first plate body at an angle. The first plate body is connected to the end surface of the second end plate, and / or the first edge is connected to the surface of the second end plate facing away from the first end plate. The surface of the second end plate facing away from the first end plate is recessed inward to form a first recess, and at least a portion of the first edge wrap is located in the first recess.

8. The battery module according to claim 7, characterized in that: The bottom surface of the first recessed portion is connected to the end surface of the second end plate at an angle and has a smooth transition, wherein the bottom surface of the first recessed portion intersects with the first direction; And / or, the bottom surface of the second recess is connected to the end surface of the first end plate at an angle and has a smooth transition, wherein the bottom surface of the second recess intersects with the first direction.

9. The battery module according to claim 7, characterized in that: Along the second direction, the maximum dimension of the first edge is smaller than the maximum dimension of the first recess; And / or, along the second direction, the maximum dimension of the second edge is smaller than the maximum dimension of the second recess.

10. The battery module according to any one of claims 1 to 9, characterized in that: The first end plate and the second end plate are both provided with connection holes penetrating through the first end plate and the second end plate along a third direction, wherein the connection holes are used to connect with the bottom plate of the box in the battery, and the third direction, the first direction and the second direction intersect each other.

11. The battery module according to any one of claims 1 to 9, characterized in that: At least one of the first end plate and the second end plate is provided with a plurality of weight-reducing holes penetrating the end plate along a third direction, and the third direction, the first direction and the second direction intersect each other.

12. The battery module according to claim 11, characterized in that: The cross-sectional area of ​​the first end plate in the third direction is S1, the first end plate is provided with the weight-reducing holes, and the total cross-sectional area of ​​the plurality of weight-reducing holes on the first end plate in the third direction is S2, wherein S1 and S2 satisfy: 60%≤S2 / S1≤90%; And / or, the cross-sectional area of ​​the second end plate in the third direction is S3, the second end plate is provided with the weight-reducing holes, and the total cross-sectional area of ​​the plurality of weight-reducing holes on the second end plate in the third direction is S4, wherein S3 and S4 satisfy: 60%≤S4 / S3≤90%.

13. A battery, characterized in that: Comprising a battery module as described in any one of claims 1-12.

14. An electrical device, characterized in that: Comprising a battery as claimed in claim 13, the battery is used to provide electrical energy.

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