CN115172979B - Battery modules, batteries and electrical devices - Google Patents

Abstract

The application discloses a battery module, a battery, and an electrical device. The battery module includes: a battery cell, a plurality of battery cells are arranged in sequence along the thickness direction of the battery; a housing for accommodating the battery cells; a connecting component The two ends respectively extend along the thickness direction of the battery cells, the connection assembly is arranged at one end of the plurality of battery cells in the height direction, and the two ends of the connection assembly are respectively connected to the casing; wherein, a connection assembly is formed between the casing and the connection assembly. The accommodation space that limits the deformation of the battery cell. In the technical solution of the embodiment of the present application, a plurality of battery cells are arranged in the battery module, which effectively expands the capacity of the battery module and expands the application range of the battery module. In addition, by setting the connecting components in the casing, the deformation of the battery cells is limited, and the safety of the battery module operation process is improved.

Description

Battery modules, batteries and electrical devices

technical field

The present application relates to the field of batteries, in particular to a battery module, a battery and an electrical device.

Background technique

Batteries are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc. Batteries can include nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion batteries, and secondary alkaline zinc-manganese batteries, among others.

At present, as the application range of batteries becomes wider and wider, the demand for battery capacity is also increasing. The capacity of the battery can be expanded by connecting multiple battery cells in series and in parallel, and the safety of multiple battery cells during operation is also one of the issues that need to be paid attention to and studied.

Contents of the invention

In view of the above problems, the present application provides a battery module, a battery and an electrical device, which can limit the deformation of the battery cells and improve the safety of the battery cells during operation.

In a first aspect, the present application provides a battery module, including:

Battery cells, multiple battery cells are arranged in sequence along their thickness direction;

a housing for accommodating a battery cell;

A connection assembly, the two ends of which extend along the thickness direction of the battery cells, the connection assembly is arranged at one end of the plurality of battery cells in the height direction, and the two ends of the connection assembly are respectively connected to the housing;

Wherein, an accommodating space that limits deformation of the battery cells is formed between the casing and the connection assembly.

In the technical solution of the embodiment of the present application, a plurality of battery cells are arranged in the battery module, which effectively expands the capacity of the battery module and expands the application range of the battery module. In addition, by providing the connecting components in the casing, the deformation of the battery cells is limited, and the safety of the battery module operation process is improved.

In some embodiments, the casing includes end plates disposed at both ends of the plurality of battery cells in the thickness direction, and a bottom plate disposed at one end of the battery cells in the height direction, and the two ends of the connector are respectively connected to the two end plates, The components are arranged opposite to the base plate. By arranging the end plate and the bottom plate and connecting the connecting piece with the two end plates, a limit structure in which the ends are sequentially connected is formed, and the deformation in the thickness direction of the battery cell is limited.

In some embodiments, the battery module includes a plurality of battery packs, each battery pack includes a plurality of battery cells arranged in sequence along the thickness direction of the battery cell, the multiple battery packs are arranged in sequence along the width direction of the battery cells, and the battery module The group also includes at least one separator arranged between two adjacent battery groups, and the two ends of the separator are respectively connected to the two end plates. In the above-mentioned technical solution, a plurality of battery packs are arranged in each battery module, and a plurality of battery cells can be arranged along the width direction to improve the regularity of the battery modules, and a spacer is provided between adjacent battery packs. The board can ensure the orderly arrangement of the battery pack.

In some embodiments, the case further includes side plates disposed at both ends of the battery cell in the width direction, and the side plates are connected end-to-end in sequence with the end plates. In the above technical solution, the side plate is set to strengthen the limit in the width direction to further improve the stability.

In some embodiments, the number of partitions is multiple, the number of connection components is multiple, and the connection components are provided in one-to-one correspondence with the partitions. The above-mentioned structure can superimpose the connection force between the connecting component and the separator, improve the stability of the connection between the separator and the end plate, and limit the deformation of the battery cells.

In some embodiments, the plurality of battery packs are of equal thickness. The above-mentioned structure can ensure that the forces on both sides of the partition are balanced, ensure the structural integrity of the entire casing, and further improve the safety performance of the battery module.

In some embodiments, there are two battery packs, and the number of battery cells in the two battery packs is equal. The two battery packs are symmetrically arranged to improve the regularity of the overall structure of the battery module and ensure the convenience of installation of the connecting components.

In some embodiments, a connection groove is provided on the end plate, and the end of the separator extends into the connection groove and is connected with the end plate. The end of the partition is fixed by setting the connecting groove, the structure is simple, and the installation is convenient.

In some embodiments, the bulkhead is welded to the end plate. Welded connection, high connection strength, strong stability.

In some embodiments, the orthographic projection of the connection assembly on the base plate at least partially coincides with the orthographic projection of the partition on the base plate. The above-mentioned structure limits the deformation of the battery cells through the connecting components, and ensures the stability and strength of the connection between the separator and the end plate.

In some embodiments, the battery cells are provided with protruding electrode terminals along their own height direction, the connection assembly is arranged between the two electrode terminals of two adjacent battery cells, and the thickness of the connection assembly is smaller than that of the electrode terminals. size of. In the above structure, the connecting component is arranged in the gap between the two electrode terminals, without occupying additional space, and the volumetric energy density of the battery cell is ensured.

In some embodiments, the end of the connecting component is bent toward the bottom plate to form a connecting portion, and the connecting portion is connected to the end plate. In the above structure, the stability of the connection between the connection assembly and the end plate is enhanced by providing the connection portion.

In some embodiments, the connecting portion is connected to a side of the end plate away from the battery cells. The above structure improves the strength of the connection between the connecting component and the end plate.

In some embodiments, the connecting portion and the end plate are connected by welding or riveting. Welding or riveting, simple structure, easy to realize.

In some embodiments, the battery module further includes a confluence component. The confluence component is arranged at one end of the battery cell away from the bottom plate in the height direction. The confluence component is electrically connected to a plurality of battery cells respectively. single side. By arranging the converging component to conduct the current of multiple battery cells, and disposing the connecting component between the battery cells and the converging component, the stability of the connection between the converging component and the battery cell can be improved.

In some embodiments, the connection assembly includes a connection bar and an insulating layer disposed around the periphery of the connection bar. By providing the insulating layer, the current of the busbar is prevented from flowing to the end plate through the connecting component, thereby improving the safety of the battery module.

In some embodiments, the connection bar is made of metal material. The connection bar is made of metal material to ensure the strength of the connection.

In some embodiments, the value range of the extension length of the connection assembly in the height direction of the battery cell: 0.5mm~2mm, and the value range of the extension length of the connection assembly in the width direction of the battery cell: 20mm~40mm . By setting a reasonable thickness and width of the connection components, while ensuring the connection strength, it does not take up too much space in the casing, so as to ensure the energy density of the battery module.

In a second aspect, the present application also provides a battery, including the battery module in the above embodiment.

In a third aspect, the present application also provides an electrical device, including the battery in the above embodiment, and the battery is used to provide electrical energy.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application;

Fig. 3 is an explosion schematic diagram of a battery cell in a battery provided by some embodiments of the present application;

Fig. 4 is a schematic structural diagram of a battery module provided by some embodiments of the present application;

Fig. 5 is a schematic structural diagram of a battery module provided by another embodiment of the present application;

Fig. 6 is a partial cross-sectional structural schematic diagram of a battery module end plate provided by some embodiments of the present application;

FIG. 7 is a partial cross-sectional structural schematic diagram of a battery module provided by other embodiments of the present application.

In the drawings, the drawings are not necessarily drawn to scale.

Explanation of reference signs:

1. Vehicle; 2. Battery; 24. Pressure relief mechanism; 25. Electrode terminal; 3. Controller;

4. Motor; 5. Box; 51. First part; 52. Second part; 53. Accommodating space;

10. Electrode unit; 11. Electrode assembly; 20. Shell; 21. Opening; 30. End cap assembly;

40. Battery module; X, thickness direction; Y, width direction; Z, height direction;

7. Battery cell;

8. Shell; 801, end plate; 802, bottom plate; 803, side plate; 804, partition; 805, connecting groove;

9. Connection component; 901, connection part; 902, rivet.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions 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 the Claim some of the examples, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application; the terms used in this application in the description of the application are only to describe specific implementations The purpose of the example is not intended to limit the present application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and the description of the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific sequence or primary-subordinate relationship.

Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection", "connection" and "attachment" should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

The term "and/or" in this application is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and A and B exist alone. There are three cases of B. In addition, the character "/" in this application generally indicates that the contextual objects are an "or" relationship.

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 the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are for illustrative purposes only, and should not constitute any limitation to the application .

"Multiple" in this application refers to two or more (including two).

In this application, the battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc. The embodiment of the present application does not limit this. The battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application. Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.

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 batteries mentioned in this application may include battery modules or battery packs. Batteries generally include a housing for enclosing one or more battery cells. The casing can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode unit and an electrolyte, the electrode unit includes at least one electrode assembly, and the electrode assembly includes a positive pole piece, a negative pole piece and a separator. A battery cell works primarily by moving metal ions between the positive and negative pole pieces. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collector and a positive electrode protrusion protruding from the positive electrode current collector, and the positive electrode current collector part is coated with a positive electrode active material layer, at least part of the positive electrode convex part is not coated with a positive electrode active material layer, and the positive electrode convex part is used as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, the positive electrode active material layer includes the positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate. 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 current collector and a negative electrode protrusion protruding from the negative electrode current collector. part is coated with a negative electrode active material layer, at least part of the negative electrode convex part is not coated with a negative electrode active material layer, and the negative electrode convex part is used as a negative electrode tab. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes the negative electrode active material, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current is passed without fusing, the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together. The material of the spacer can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, which is not limited in the embodiment of the present application.

The technical solutions described in the embodiments of the present application are applicable to the battery 2 and the electric device using the battery 2 . The electric device may be a vehicle 1, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle 1 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended-range car, etc.; spacecraft includes airplanes, rockets, space shuttles and spaceships, etc.; electric toys include Stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as , Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose special limitations on the above-mentioned electrical devices.

In the following embodiments, for the convenience of description, the electric device is taken as an example for description.

Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application. As shown in FIG. 1 , a battery 2 is arranged inside the vehicle 1 , and the battery 2 can be arranged at the bottom, head or tail of the vehicle 1 . The battery 2 can be used for power supply of the vehicle 1 , for example, the battery 2 can be used as an operating power source of the vehicle 1 .

The vehicle 1 may also include a controller 3 and a motor 4 , the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

In some embodiments of the present application, the battery 2 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 to provide driving power for the vehicle 1 instead of or partially replacing fuel oil or natural gas.

Fig. 2 is a schematic exploded view of a battery 2 provided by some embodiments of the present application. As shown in FIG. 2 , the battery 2 includes a case 5 and a battery module 40 , a plurality of battery cells form the battery module 40 , and the battery module 40 is housed in the case 5 .

The box body 5 is used to accommodate the battery cells, and the box body 5 may have various structures. In some embodiments, the box body 5 may include a first part 51 and a second part 52, the first part 51 and the second part 52 cover each other, and the first part 51 and the second part 52 jointly define a cavity for accommodating the battery cells. Accommodating space 53 . The second part 52 can be a hollow structure with an open end, the first part 51 is a plate-like structure, and the first part 51 covers the opening side of the second part 52 to form a box body 5 with an accommodation space 53; the first part 51 and the second part The two parts 52 can also be hollow structures with one side open, and the open side of the first part 51 covers the open side of the second part 52 to form the box body 5 with the receiving space 53 . Of course, the first part 51 and the second part 52 can be in various shapes, such as cylinder, cuboid and so on.

In order to improve the sealing performance after the first part 51 and the second part 52 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first part 51 and the second part 52 .

Assuming that the first part 51 covers the top of the second part 52 , the first part 51 can also be called the upper box cover, and the second part 52 can also be called the lower box body.

In the battery 2, there may be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel or in parallel. The hybrid connection means that there are both series and parallel connections among the multiple battery cells. A plurality of battery cells can be directly connected in series or in parallel or mixed together, and then the whole composed of a plurality of battery cells is accommodated in the box 5; of course, it is also possible to first connect a plurality of battery cells in series or parallel or The battery modules 40 are formed by parallel connection, and multiple battery modules 40 are connected in series or in parallel or mixed to form a whole, and are housed in the box body 5 .

Fig. 3 is an exploded schematic diagram of a battery cell in a battery provided by some embodiments of the present application. In some embodiments, there are multiple battery cells 7 , and the multiple battery cells 7 are connected in series, in parallel or in parallel to form a battery module 40 . A plurality of battery modules 40 are connected in series, in parallel or in combination to form a whole and accommodated in the box.

The plurality of battery cells 7 in the battery module 40 can be electrically connected through a bus component, so as to realize parallel connection, series connection or mixed connection of the plurality of battery cells 7 in the battery module 40 .

The battery cell 7 of the embodiment of the present application includes an electrode unit 10 , a casing 20 and an end cap assembly 30 . The casing 20 has an opening 21 , the electrode unit 10 is accommodated in the casing 20 , and the end cap assembly 30 is used to connect the casing 20 and cover the opening 21 .

The electrode unit 10 includes at least one electrode assembly 11 . Exemplarily, the electrode unit 10 in FIG. 3 includes two electrode assemblies 11 . The electrode assembly 11 includes a positive pole piece, a negative pole piece and a separator. The electrode assembly 11 may be a wound electrode assembly, a laminated electrode assembly or other forms of electrode assemblies.

In some embodiments, the electrode assembly 11 is a wound electrode assembly. The positive pole piece, the negative pole piece and the separator are all strip-shaped structures. In the embodiment of the present application, the positive pole piece, the separator, and the negative pole piece can be stacked in sequence and wound more than two times to form the electrode assembly 11 .

In other embodiments, the electrode assembly 11 is a laminated electrode assembly. Specifically, the electrode assembly 11 includes a plurality of positive electrode sheets and a plurality of negative electrode sheets, the positive electrode sheets and the negative electrode sheets are alternately stacked, and the stacking direction is parallel to the thickness direction of the positive electrode sheet and the thickness direction of the negative electrode sheet.

The electrode unit 10 includes at least one electrode assembly 11 . That is to say, in the battery cell 7 , there may be one or more electrode assemblies 11 housed in the case 20 .

The shell 20 is a hollow structure with one side open. The end cap assembly 30 covers the opening of the housing 20 and forms a sealed connection to form a housing cavity for housing the electrode unit 10 and the electrolyte.

The housing 20 can be in various shapes, such as cylinder, cuboid and so on. The shape of the housing 20 can be determined according to the specific shape of the electrode unit 10 . For example, if the electrode unit 10 has a cylindrical structure, a cylindrical shell can be selected; if the electrode unit 10 has a rectangular parallelepiped structure, a rectangular parallelepiped shell can be selected. Of course, the end cover assembly 30 can also be of various structures, for example, a plate-like structure or a hollow structure with one end open. Exemplarily, the housing 20 has a rectangular parallelepiped structure, and the end cover assembly 30 has a plate-like structure, and the end cover assembly 30 covers the opening at the top of the housing 20 .

The end cap assembly 30 also includes an electrode terminal 25 . In some embodiments, there are two electrode terminals 25, and the two electrode terminals 25 are respectively defined as a positive electrode terminal and a negative electrode terminal. The positive electrode terminal and the negative electrode terminal are respectively used for electrical connection with the positive ear and the negative ear of the electrode assembly 11 to output the current generated by the electrode assembly 11 .

The end cover assembly 30 also includes a pressure relief mechanism 24 for releasing the internal pressure or temperature of the battery cell 7 when the internal pressure or temperature of the battery cell 7 reaches a predetermined value. Exemplarily, the pressure relief mechanism 24 is located between the positive electrode terminal and the negative electrode terminal, and the pressure relief mechanism 24 may be a component such as an explosion-proof valve, a burst disk, a gas valve, a pressure relief valve, or a safety valve.

In some embodiments, the housing 20 can also be a hollow structure with opposite sides open. The end cover assembly 30 includes two end cover assemblies 30 , and the two end cover assemblies 30 respectively cover two openings of the casing 20 and are sealed and connected to form an accommodating chamber for accommodating the electrode unit 10 and the electrolyte. In some examples, the positive electrode terminal and the negative electrode terminal may be mounted on the same end cap assembly 30 . In other examples, the positive electrode terminal and the negative electrode terminal are installed on the two end cap assemblies 30 respectively.

In the battery module, in order to ensure the structural stability of the battery module as much as possible, a plurality of battery cells are usually stacked in sequence along the thickness direction. During the operation of the battery cell, as the temperature rises, the electrode tab will expand along the thickness direction. The electrode tabs in the battery cell are usually stacked along the thickness direction. Therefore, the deformation in the thickness direction of the battery cell is the largest. According to the experimental test, in the thickness direction of the battery cell, the deformation of the battery module can reach 5mm~10mm under high temperature conditions. Of course, some deformation also occurs in the width direction of the battery cell, but the deformation amount is smaller than the deformation in the thickness direction of the battery cell. After multiple battery cells are arranged along the thickness direction, the multiple battery cells expand along the thickness direction at the same time, and the superposition of deformations will cause deformation or even rupture of the casing of the battery module. The battery cell loses its restraint, which leads to safety accidents.

In order to prevent the above situation from happening and improve the safety of the battery cells during operation, the inventor has designed a battery module. The battery module includes a connecting component, and the connecting component is arranged in the height direction of a plurality of battery cells. One end of the connecting component, and the two ends of the connecting component are respectively connected to the housing of the battery module; wherein, an accommodating space is formed between the housing and the connecting component to limit the deformation of the battery cells.

In the technical solution of the embodiment of the present application, a plurality of battery cells are arranged in the battery module, and by connecting the battery cells in series or in parallel, the capacity of the battery module is effectively expanded, and the application range of the battery module is expanded. . In addition, by providing the connecting components in the casing, the deformation of the battery cells is limited, and the safety of the battery module operation process is improved.

Specific embodiments of the battery module in this application will be described in detail below.

Please continue to refer to FIG. 4 to FIG. 7, FIG. 4 is a schematic structural diagram of a battery module 40 provided in some embodiments of the present application; FIG. 5 is a schematic structural diagram of a battery module 40 provided in other embodiments of the present application; FIG. A partial cross-sectional structural schematic diagram of a battery module end plate provided by some embodiments of the application; FIG. 7 is a partial cross-sectional structural schematic diagram of a battery module 40 provided by other embodiments of the present application.

As shown in FIG. 4 , the embodiment of the present application provides a battery module 40 , including: a battery cell 7 , a casing 8 and a connection assembly 9 . A plurality of battery cells 7 are arranged in sequence along the thickness direction X thereof. The case 8 is used to house the battery cells 7 . The two ends of the connecting assembly 9 extend along the thickness direction X of the battery cell 7 respectively, the connecting assembly 9 is arranged at one end of the plurality of battery cells 7 in the height direction Z, and the two ends of the connecting assembly 9 are respectively connected to the casing 8; Wherein, an accommodating space that limits deformation of the battery cell 7 is formed between the casing 8 and the connection assembly 9 .

Specifically, the thickness direction X of the battery cell 7 is the stacking direction of the electrode tabs in the battery cell 7 , and is also the direction in which the deformation of the battery cell 7 is the largest. The housing 8 can be formed by surrounding a plurality of side plates 803 and a bottom plate 802, or it can be an integral housing structure with openings. The connection assembly 9 can be disposed on the opening of the housing 8 . The housing 8 can be made of a material with certain strength, such as metal material and the like. In addition, the inner wall of the housing 8 can be arranged to be attached to the battery cell 7 so as to form a certain restraint on the battery cell 7 .

The connection component 9 is usually a strip structure, and the connection component 9 itself has a certain tensile strength, resists the deformation of the battery cell 7 in the thickness direction X, and forms a certain constraint on the battery cell 7 . Moreover, the volume of the connection assembly 9 cannot be too large, so as to ensure the energy density of the battery module 40 .

In the technical solution of the embodiment of the present application, a plurality of battery cells 7 are arranged in the battery module 40, and by connecting the battery cells 7 in series or in parallel, the capacity of the battery module 40 is effectively expanded, and the capacity of the battery module is enlarged. Group 40 range of application. Moreover, by providing the connection assembly 9 in the casing 8, the deformation of the battery cells 7 is limited, and the safety of the battery module 40 during operation is improved.

In some embodiments of the present application, the housing 8 includes end plates 801 disposed at both ends of the battery cells 7 in the thickness direction X, and a bottom plate 802 disposed at one end of the battery cells 7 in the height direction Z. The ends are connected to two end plates 801 respectively, and the connection assembly 9 is arranged opposite to the bottom plate 802 . By arranging the end plate 801 and the bottom plate 802 and connecting the connecting piece with the two end plates 801 , a limit structure with end to end sequential connection is formed to limit the deformation of the battery cell 7 in the thickness direction X.

In some embodiments of the present application, as shown in FIG. 5 and FIG. 6 , the battery module 40 includes a plurality of battery packs, and each battery pack includes a plurality of battery cells 7 arranged in sequence along the thickness direction X of itself. Two battery packs are sequentially arranged along the width direction Y of the battery cells 7. The battery module 40 also includes at least one separator 804 arranged between two adjacent battery packs. The two ends of the separator 804 are respectively connected to the two ends. Board 801.

In the above-mentioned technical solution, a plurality of battery packs are arranged in each battery module group 40, and a plurality of battery cells 7 can be arranged along the width direction Y to improve the regularity of the battery module group 40, and the adjacent battery packs A separator 804 is arranged between them, which can ensure the orderly arrangement of the battery packs in the width direction Y.

In some embodiments of the present application, the casing 8 further includes side plates 803 disposed at both ends of the battery cell 7 in the width direction Y, and the side plates 803 are connected end-to-end with the end plates 801 in turn. In the above technical solution, the side plate 803 is provided to enhance the limit in the width direction Y, further improving the stability.

In some embodiments of the present application, the number of partitions 804 is multiple, the number of connecting components 9 is multiple, and the connecting components 9 and the partitions 804 are provided in one-to-one correspondence. The above structure can superimpose the connection between the connecting assembly 9 and the separator 804 , improve the stability of the connection between the separator 804 and the end plate 801 , and limit the deformation of the battery cell 7 .

In some embodiments of the present application, the thicknesses of the plurality of battery packs are equal. The number of battery packs can also be set in multiples, for example, 3 or 5 battery packs are arranged along the width direction Y. The above-mentioned structure can ensure that the forces on both sides of the separator 804 are balanced, ensure the structural integrity of the entire housing 8 , and further improve the safety performance of the battery module 40 .

In some embodiments of the present application, there are two battery packs, and the number of battery cells 7 in the two battery packs is equal. The two battery packs are arranged symmetrically, which improves the regularity of the overall structure of the battery module 40 and ensures the convenience of installation of the connection assembly 9 .

In some embodiments of the present application, the end plate 801 is provided with a connection groove 805 , and the end of the partition plate 804 extends into the connection groove 805 and is connected with the end plate 801 . The end of the partition plate 804 is fixed by providing the connecting groove 805, which has a simple structure and is convenient for installation.

In some embodiments of the present application, the partition plate 804 is welded to the end plate 801 . Welded connection, high connection strength, strong stability.

In some embodiments of the present application, the orthographic projection of the connection assembly 9 on the bottom plate 802 and the orthographic projection of the partition plate 804 on the bottom plate 802 are at least partially coincident. The above-mentioned structure limits the deformation of the battery cells 7 through the connection assembly 9 and ensures the stability and strength of the connection between the separator 804 and the end plate 801 .

In some embodiments of the present application, the battery cells 7 are provided with electrode terminals 25 protruding along their own height direction Z, and the connection assembly 9 is arranged between the two electrode terminals 25 of two adjacent battery cells 7 , The thickness of the connecting member 9 is smaller than the dimension by which the electrode terminal 25 protrudes. In the above structure, the connection assembly 9 is arranged in the gap between the two electrode terminals 25 without occupying additional space, and the volumetric energy density of the battery cell 7 is guaranteed.

In some embodiments of the present application, the end of the connection assembly 9 is bent toward the bottom plate 802 to form a connection portion 901 , and the connection portion 901 is connected to the end plate 801 . In the above structure, the connection stability between the connecting assembly 9 and the end plate 801 is enhanced by providing the connecting portion 901 .

In some embodiments of the present application, the connecting portion 901 is connected to the side of the end plate 801 away from the battery cell 7 . The above-mentioned structure improves the connection strength between the connection assembly 9 and the end plate 801 .

In some embodiments of the present application, the connecting portion 901 and the end plate 801 are connected by welding or riveting. Welding or riveting, simple structure, easy to realize. As shown in FIG. 7 , the connecting portion 901 of the connecting assembly 9 is provided with a connecting hole, and the end plate 801 is provided with a concave fixing hole. The rivet 902 passes through the connecting hole and extends into the fixing hole to connect the connecting component 9 and the end plate 801 . The above structure has stable connection and high strength.

In some embodiments of the present application, the battery module 40 also includes a confluence part (not shown in the figure), which is arranged at the end of the battery cell 7 in the height direction Z away from the bottom plate 802, and the confluence part is respectively connected to a plurality of battery cells. The body 7 is electrically connected, and the connection assembly 9 is provided on the side of the bus component facing the battery cell 7 . By arranging the confluence component to conduct the current of multiple battery cells 7 , and disposing the connection assembly 9 between the battery cells 7 and the confluence component, the stability of the connection between the confluence component and the battery cell 7 can be improved.

In some embodiments of the present application, the connecting component 9 includes a connecting bar and an insulating layer disposed around the outer periphery of the connecting bar. By providing an insulating layer, the current of the busbar is prevented from flowing to the end plate 801 through the connection assembly 9 , which improves the safety of the battery module 40 .

In some embodiments of the present application, the connection bar is made of metal material. The connection bar is made of metal material to ensure the strength of the connection. Exemplarily, according to the strength requirements of the battery module 40 and the environmental conditions, the material of the steel strip can be selected from stainless steel, spring steel or 65Mn.

In some embodiments of the present application, the extension length of the connection assembly 9 in the height direction Z of the battery cell 7 ranges from 0.5 mm to 2 mm, and the extension of the connection assembly 9 in the width direction Y of the battery cell 7 The value range of length: 20mm~40mm. By setting a reasonable thickness and width of the connecting component 9 , while ensuring the connection strength, the energy density of the battery module 40 is guaranteed without occupying too much space in the casing 20 .

Please refer to FIG. 5 to FIG. 7 , in a specific embodiment provided by the present application, a battery module 40 includes a battery cell 7 , a casing 8 and a connection assembly 9 . A plurality of battery cells 7 are arranged in sequence along the thickness direction X thereof. The case 8 is used to house the battery cells 7 . The two ends of the connecting assembly 9 extend along the thickness direction X of the battery cell 7 respectively, the connecting assembly 9 is arranged at one end of the plurality of battery cells 7 in the height direction Z, and the two ends of the connecting assembly 9 are respectively connected to the casing 8; Wherein, an accommodating space that limits deformation of the battery cell 7 is formed between the casing 8 and the connection assembly 9 . The casing 8 includes end plates 801 disposed at both ends of the battery cells 7 in the thickness direction X, and a bottom plate 802 disposed at one end of the battery cells 7 in the height direction Z, and the two ends of the connector are respectively connected to the two end plates 801 , the connection assembly 9 is disposed opposite to the bottom plate 802 . The battery module 40 includes a plurality of battery packs, and each battery pack includes a plurality of battery cells 7 arranged in sequence along the thickness direction X of the battery pack, and the plurality of battery packs are sequentially arranged along the width direction Y of the battery cells 7. 40 also includes at least one separator 804 disposed between two adjacent battery packs, and the two ends of the separator 804 are respectively connected to the two end plates 801 . The casing 8 further includes side plates 803 arranged at both ends of the battery cell 7 in the width direction Y, and the side plates 803 are connected end to end with the end plates 801 in turn.

There are two battery packs, and the number of battery cells 7 in the two battery packs is equal. The end plate 801 is provided with a connection groove 805 , and the end of the separator 804 extends into the connection groove 805 and is connected with the end plate 801 . The partition plate 804 is welded to the end plate 801 . The orthographic projection of the connecting assembly 9 on the bottom plate 802 and the orthographic projection of the partition plate 804 on the bottom plate 802 are at least partially coincident. The battery cell 7 is provided with an electrode terminal 25 protruding along its own height direction Z, and the connecting assembly 9 is arranged between the two electrode terminals 25 of two adjacent battery cells 7, and the thickness of the connecting assembly 9 is smaller than that of the electrode terminal 25. Protruding size. The end of the connecting assembly 9 is bent toward the bottom plate 802 to form a connecting portion 901 , and the connecting portion 901 is connected to the end plate 801 . The connection portion 901 is connected to a side of the end plate 801 away from the battery cell 7 . The connecting portion 901 is connected to the end plate 801 by welding or riveting. The battery module 40 also includes a confluence component. The confluence component is arranged at one end of the battery cell 7 in the height direction Z away from the bottom plate 802. The confluence component is electrically connected to a plurality of battery cells 7 respectively. The connection assembly 9 is disposed on the confluence component facing the battery. One side of monomer 7. The connection assembly 9 includes a connection bar and an insulating layer surrounding the outer periphery of the connection bar.

In the above-mentioned embodiment, the casing 8 includes end plates 801 disposed at both ends of the battery cells 7 in the thickness direction X, and a bottom plate 802 disposed at one end of the battery cells 7 in the height direction Z, and the two ends of the connectors are respectively Connected to the two end plates 801 , the connection assembly 9 is disposed opposite to the bottom plate 802 . By arranging the end plate 801 and the bottom plate 802 and connecting the connecting piece with the two end plates 801 , a limit structure with end to end sequential connection is formed to limit the deformation of the battery cell 7 in the thickness direction X.

The embodiment of the present application also provides a battery 2, including the battery module 40 in the above embodiment. The embodiment of the present application also provides an electric device, the electric device includes the battery 2 in the above embodiment, and the battery 2 is used to provide electric energy. Since the above-mentioned battery 2 and the power-consuming device both include the battery module 40 in the above-mentioned embodiment, the battery 2 and the power-consuming device provided in the embodiment of the present application can both achieve the above-mentioned technical effects. While the present application has been described with reference to a preferred embodiment, various modifications may be made thereto and equivalents may be substituted for parts thereof without departing from the scope of the present application, in particular, as long as there are no structural conflicts , the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (18)

1. A battery module, comprising: A battery cell, a plurality of the battery cells are arranged in sequence along their thickness direction; a housing for accommodating the battery cells; A connection assembly, the two ends of which respectively extend along the thickness direction of the battery cells, the connection assembly is provided at one end of the plurality of battery cells in the height direction, and the two ends of the connection assembly are respectively connected to the case; Wherein, an accommodating space that restricts deformation of the battery cells is formed between the casing and the connection assembly, The battery module group includes a plurality of battery packs, each of the battery packs includes a plurality of battery cells arranged in sequence along the thickness direction of the battery pack, and the plurality of battery packs are sequentially arranged along the width direction of the battery cells It is provided that the battery module group further includes at least one separator arranged between two adjacent battery packs, and the housing includes end plates arranged at both ends of the plurality of battery cells in the thickness direction, so The two ends of the partition are respectively connected to the two end plates, The number of the partitions is multiple, the number of the connection components is multiple, and the connection components are provided in one-to-one correspondence with the partitions. 2. The battery module according to claim 1, wherein the housing includes a bottom plate provided at one end of the battery cell in the height direction, and the two ends of the connection assembly are respectively connected to the two ends. plate, and the connecting component is arranged opposite to the bottom plate. 3 . The battery module according to claim 2 , wherein the casing further comprises side plates provided at both ends of the battery cell in the width direction, and the side plates are connected end to end with the end plates in sequence. 4 . 4. The battery module according to claim 2, wherein the plurality of battery packs have the same thickness. 5. The battery module according to claim 2, wherein there are two battery packs, and the battery cells in the two battery packs are equal in number. 6. The battery module according to any one of claims 3 to 5, wherein a connection groove is provided on the end plate, and the end of the separator extends into the connection groove and is connected to the connection groove. end plate connection. 7. The battery module according to claim 6, wherein the separator is connected to the end plate by welding. 8 . The battery module according to claim 6 , wherein the orthographic projection of the connection assembly on the bottom plate is at least partially coincident with the orthographic projection of the separator on the bottom plate. 9. The battery module according to claim 6, wherein the battery cells are provided with electrode terminals protruding along the height direction thereof, and the connecting components are arranged on two adjacent battery cells Between the two electrode terminals, the thickness of the connecting component is smaller than the protruding dimension of the electrode terminals. 10. The battery module according to any one of claims 2 to 5, wherein the end of the connecting assembly is bent toward the bottom plate to form a connecting portion, and the connecting portion is connected to the end plate connect. 11. The battery module according to claim 10, wherein the connection portion is connected to a side of the end plate away from the battery cell. 12 . The battery module according to claim 10 , wherein the connecting portion and the end plate are connected by welding or riveting. 13 . 13. The battery module according to any one of claims 2 to 5, characterized in that, the battery module further comprises a confluence part, and the confluence part is arranged in the height direction of the battery cells away from the At one end of the bottom plate, the confluence components are respectively electrically connected to a plurality of the battery cells, and the connection assembly is disposed on a side of the confluence component facing the battery cells. 14 . The battery module according to claim 13 , wherein the connecting assembly comprises a connecting bar and an insulating layer surrounding the outer periphery of the connecting bar. 15 . 15. The battery module according to claim 14, wherein the connection bar is made of metal material. 16. The battery module according to claim 13, wherein the extension length of the connecting component in the height direction of the battery cell ranges from 0.5 mm to 2 mm, and the connecting component is The value range of the extension length of the battery cell in the width direction is 20mm~40mm. 17. A battery, comprising the battery module according to any one of claims 1-16. 18. An electrical device, characterized by comprising the battery according to claim 17, the battery being used to provide electrical energy.

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