Preparation Method of Battery Device, Electrical Device and Battery Box

Abstract

An embodiment of the present application provides a battery device, an electrical device, and a preparation method of a battery box body. The battery device includes: a battery cell group; a first box body and a second box body, which are buckled with each other to form a space for accommodating the battery cell group; and a busbar assembly, which is embedded in the wall body of the first box body, and the busbar assembly is electrically connected to the battery cell group; the battery cell group includes battery cells, the busbar assembly includes busbars, the battery cells are provided with pole columns, openings corresponding to the pole columns are provided on the wall body of the first box body, and the pole columns pass through the openings and are in contact connection with the busbars; the pole columns are arranged on the first side surface of the battery cell, and the number of the pole columns is two, and an accommodation area is formed between the two pole columns, the wall body of the first box body and the first side surface of the battery cell; the battery device further includes a wiring harness assembly, and the wiring harness assembly is arranged in the accommodation area. The size of the battery device in the third direction will not be increased due to the arrangement of the busbar assembly and the wiring harness assembly, etc., and the energy density of the battery device is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery device, an electrical device, and a preparation method of a battery box body. Background Art

[0002] In some related technologies, a battery device includes a first box body, a second box body, and a plurality of battery cells. The first box body and the second box body are buckled with each other to accommodate the plurality of battery cells. A space is reserved between the plurality of battery cells and the first box body for arranging a CCS (Cell Connector System, battery cell connection system, or also called an integrated busbar, a wiring harness board assembly, etc.), resulting in a relatively high overall height of the battery and a reduction in energy density. Summary of the Invention

[0003] Some embodiments of this application provide a battery device, an electrical device, and a preparation method of a battery box body, which are used to alleviate the problem of low battery energy density.

[0004] Some embodiments of this application provide a battery device, which includes: a battery cell group; a first box body and a second box body that are buckled with each other to form a space for accommodating the battery cell group; and a busbar assembly embedded in the wall body of the first box body, where the busbar assembly is electrically connected to the battery cell group; the battery cell group includes battery cells, the busbar assembly includes a busbar, the battery cells are provided with pole columns, openings are provided at positions corresponding to the pole columns on the wall body of the first box body, and the pole columns pass through the openings and are in contact connection with the busbar; the pole columns are arranged on a first side surface of the battery cells, and the number of the pole columns is two. An accommodation area is formed between the two pole columns, the wall body of the first box body, and the first side surface of the battery cells; the battery device further includes a wiring harness assembly arranged in the accommodation area.

[0005] In the above embodiment, the busbar assembly is embedded in the wall body of the first box body, and the busbar assembly does not protrude beyond the wall body of the first box body in the third direction. Therefore, the size of the battery device in the third direction will not be increased due to the arrangement of the busbar assembly, the size of the battery device in the third direction is reduced, and the energy density of the battery device is improved.

[0006] In the above embodiment, the pole columns pass through the openings and are in contact connection with the busbar, which can realize the electrical connection between the battery cells and the busbar. The busbar and the pole columns are in contact connection, and no other components need to be arranged in the third direction, so the size of the battery device in the third direction will not be increased, and the energy density of the battery device can be improved.

[0007] In the above embodiment, the wiring harness assembly is arranged between the first side surface and the wall of the first box body, and the space between the first side surface of the battery cell and the wall of the first box body is cleverly utilized. Due to the space generated by the arrangement of the pole, the size of the battery device in the third direction will not be increased due to the need to arrange the wiring harness assembly, thereby reducing the overall size of the battery device in the third direction and improving the energy density of the battery device.

[0008] In some embodiments, the containing area is filled with a first colloid, and the first colloid bonds the battery cell and the first box.

[0009] In the above embodiment, the first side surface of the battery cell is bonded to the wall of the first box body by the first colloid, which strengthens the firmness of the connection between the battery cell and the first box body, improves the vibration consistency of the battery cell and the first box body, reduces the problem of collision between the battery cell and the first box body, and improves the integrity of the battery device.

[0010] In some embodiments, the first colloid is disposed around the circumference of the wiring harness assembly.

[0011] In the above embodiment, the first colloid is arranged around the circumference of the wiring harness assembly, which can not only fix the wiring harness assembly and reduce the shaking of the wiring harness assembly, but also strengthen the firmness of the connection between the wiring harness assembly, the battery cell and the first box, and improve the vibration consistency of the wiring harness assembly, the battery cell and the first box.

[0012] In some embodiments, a process hole is provided on a side of the wall of the first box body away from the opening.

[0013] In the above embodiment, in order to realize the connection between the busbar and the pole, a process hole is provided on the side of the wall of the first box body facing away from the outlet, and the process hole corresponds to the position of the busbar to allow related equipment to pass through, thereby realizing the connection between the busbar and the pole, and facilitating the connection operation between the busbar and the pole.

[0014] In some embodiments, the battery device further includes an insulating member, which is disposed on a side of the first box body facing away from the battery cell and covers the process hole.

[0015] In the above embodiment, since the position of the process hole corresponds to the busbar, in order to reduce the risk of leakage or electric shock, an insulating member is provided on the side of the first box body away from the battery cell. The process hole is covered by the insulating member, thereby reducing the risk of leakage or electric shock of the battery device.

[0016] In some embodiments, the battery cell group includes at least two battery cells arranged in a first direction. Each battery cell is provided with two pole columns. One of the pole columns of each battery cell forms a first pole column row along the first direction, and the other pole column of each battery cell forms a second pole column row along the first direction. The first pole column row and the second pole column row are arranged in a second direction. The busbar assembly includes a first busbar and a second busbar arranged in the second direction. The first busbar and the second busbar each include at least two busbar members arranged in the first direction. Each pole column in the first pole column row is electrically connected to each busbar member in the first busbar in one-to-one correspondence. Each pole column in the second pole column row is electrically connected to each busbar member in the second busbar in one-to-one correspondence.

[0017] In the above embodiments, the battery cell group includes at least two battery cells arranged along the first direction X. Each battery cell is provided with two pole columns. The busbar assembly includes a plurality of busbar members. Each pole column is correspondingly electrically connected to a busbar member to achieve the electrical connection between the battery cell group and the busbar assembly, enabling the current between the battery cells to flow smoothly, thereby realizing the storage and release of electrical energy. The plurality of busbar members are embedded in the wall body of the first box body, which can improve the stiffness of the first box body. Embedding the busbar members in the wall body of the first box body does not increase the size of the battery device in the third direction due to the need to reserve space between the first box body and the battery cells for arranging the busbar members, reducing the overall size of the battery device in the third direction and improving the energy density of the battery device.

[0018] In some embodiments, the wall body of the first box body is the bottom wall of the battery device.

[0019] In the above embodiments, the wall body of the first box body is the bottom wall of the battery device, that is, the bottom wall of the box body. Embedding the busbar assembly in the wall body of the first box body can improve the stiffness of the first box body through the busbar assembly, reduce the deformation amount of the first box body after loading, and enable the first box body as the bottom wall to provide better support for the battery cells.

[0020] In some embodiments, the first box body and the busbar assembly are integrally formed by injection molding.

[0021] In the above embodiments, the first box body is formed by injection molding, which can reduce the weight of the first box body; the first box body and the busbar assembly are integrally formed by injection molding, which can embed the busbar assembly in the wall body of the first box body, reduce the processing procedures and processing costs, improve the connection strength between the busbar assembly and the first box body, and reduce quality problems such as the busbar assembly falling off the first box body during the transportation process; furthermore, compared with a box body with a single injection molding structure, the busbar assembly is embedded in the wall body of the first box body, which can improve the stiffness of the first box body through the busbar assembly, reduce the deformation amount of the first box body after being loaded, and enable the first box body to provide better support for the battery cell group. In addition, the first box body and the busbar assembly are integrally formed by injection molding, which can improve the frequency synchronization between the first box body and the busbar assembly, reduce mutual vibration, and improve the integrity of the battery device. Moreover, the busbar assembly is embedded in the wall body of the first box body by injection molding, and it will not increase the size of the battery device in the third direction due to the need to reserve space between the first box body and the battery cell group for setting the busbar assembly, reduce the overall size of the battery device in the third direction, and improve the energy density of the battery device.

[0022] In some embodiments, the first box body and the busbar assembly are integrally formed by compression molding.

[0023] In the above embodiments, the first box body is formed by compression molding, which can reduce the weight of the first box body; the first box body and the busbar assembly are integrally formed by compression molding, which can embed the busbar assembly in the wall body of the first box body, reduce the processing procedures and processing costs, improve the connection strength between the busbar component and the first box body, and reduce quality problems such as the busbar assembly falling off the first box body during the transportation process; furthermore, compared with a box body with a single compression molding structure, the busbar assembly is embedded in the wall body of the first box body, which can improve the stiffness of the first box body through the busbar assembly, reduce the deformation amount of the first box body after being loaded, and enable the first box body to provide better support for the battery cell group. In addition, the first box body and the busbar assembly are integrally formed by compression molding, which can improve the frequency synchronization between the first box body and the busbar assembly, reduce mutual vibration, and improve the integrity of the battery device. Moreover, the busbar assembly is embedded in the wall body of the first box body by compression molding process, and it will not increase the size of the battery device in the third direction due to the need to reserve space between the first box body and the battery cell group for setting the busbar assembly, reduce the overall size of the battery device in the third direction, and improve the energy density of the battery device.

[0024] In some embodiments, the busbar assembly includes a busbar, a groove is provided on the wall body of the first box body, the busbar is provided in the groove, the battery cell group includes battery cells, the battery cells are provided with pole columns, and the pole columns are connected to the busbar.

[0025] In the above embodiments, a groove is provided in the wall of the first box body, and the busbar is arranged in the groove. The busbar does not protrude beyond the groove, and thus an opening exposing the busbar is naturally formed on the wall of the first box body. Therefore, the size of the first box body in the third direction does not change after the busbar is arranged, and the size of the battery device in the third direction will not increase due to the need to reserve space between the first box body and the battery cell for arranging the busbar, reducing the overall size of the battery device in the third direction and improving the energy density of the battery device.

[0026] In some embodiments, the busbar and the groove are connected by a second colloid.

[0027] In the above embodiments, the busbar and the groove are connected by a second colloid, with simple process and convenient operation.

[0028] In some embodiments, the side of the battery cell group facing away from the first box body and the second box body are connected by a third colloid.

[0029] In the above embodiments, the second box body and the battery cell group are connected by a third colloid, which increases the bonding depth between the battery cell group and the second box body, can greatly improve the integrity of the battery device, reduce the collision between the battery cell group and the second box body, and improve the safety of the battery device.

[0030] Some embodiments of the present application provide an electrical device, which includes the above battery device.

[0031] The electrical device provided by the embodiments of the present application includes the battery device provided by the embodiments of the present application, and accordingly has the beneficial effects of the battery device.

[0032] Some embodiments of the present application provide a preparation method of a battery box body. The battery box body includes the first box body in the above embodiments. The preparation method includes the following steps: placing the busbar into the mold for preparing the first box body, injecting materials into the mold, and integrally forming the first box body with the busbar embedded therein through an injection molding process.

[0033] In the above embodiments, the first box body is formed by injection molding, which can reduce the weight of the first box body; the first box body and at least two bus bars are integrally formed by injection molding, which can embed the bus bars in the wall body of the first box body, reduce the processing procedures and processing costs, improve the connection strength between the bus bars and the first box body, and reduce quality problems such as the bus bars falling off from the first box body after the transfer process; furthermore, compared with a box body of a single injection molding structure, the bus bars are embedded in the wall body of the first box body, which can improve the stiffness of the first box body through the bus bars, reduce the deformation amount of the first box body after being loaded, and enable the first box body to provide better support for the battery cell group. Also, the first box body and at least two bus bars are integrally formed by an injection molding process, which can improve the frequency synchronization between the first box body and the bus bars, reduce vibration, and improve the integrity of the battery device. Furthermore, the bus bars are embedded in the wall body of the first box body by injection molding, which will not increase the size of the battery device in the third direction due to the need to reserve space between the first box body and the battery cell group for arranging the bus bars, reduce the overall size of the battery device in the third direction, and improve the energy density of the battery device.

[0034] Some embodiments of the present application provide a method for preparing a battery box body. The battery box body includes the first box body in the above embodiments. The preparation method includes the following steps: placing the bus bar into a mold for preparing the first box body, injecting materials on one side in the thickness direction of the bus bar first, and then injecting materials on the other side in the thickness direction of the bus bar, and integrally forming the first box body with the bus bar embedded therein through a two-shot injection molding process.

[0035] In the above embodiments, the bus bar and the first box body are integrally formed by a two-shot injection molding process, which can reduce quality problems such as voids existing around the bus bar and the bus bar being prone to falling off caused by the fact that when the volume of the first box body is too large, the materials around the bus bar are not fully injected, that is, the primary materials cannot fill up.

[0036] Some embodiments of the present application provide a method for preparing a battery box body. The battery box body includes the first box body in the above embodiments. The preparation method includes the following steps: placing two layers of fiber cloth into a mold for preparing the first box body, fixing the bus bar between the two layers of fiber cloth, wherein windows for exposing the connection surface of the bus bar are reserved on the two layers of fiber cloth; closing the mold and injecting materials into the mold cavity, and integrally forming the first box body with the bus bar embedded therein through a compression molding process.

[0037] In the above embodiments, the first box body is formed by molding, which can reduce the weight of the first box body; the first box body and at least two busbars are integrally formed by molding, which can embed the busbars in the wall body of the first box body, reduce the processing procedures and processing costs, improve the connection strength between the busbars and the first box body, and reduce quality problems such as the busbars falling off the first box body after the transportation process; furthermore, compared with the box body of a single molding structure, the busbars are embedded in the wall body of the first box body, which can improve the stiffness of the first box body through the busbars, reduce the deformation amount of the first box body after being loaded, and enable the first box body to provide better support for the battery cells. And, the first box body and at least two busbars are integrally formed by molding, which can improve the frequency synchronization between the first box body and the busbars, reduce vibration, and improve the integrity of the battery device. Furthermore, the busbars are embedded in the wall body of the first box body through the molding process, and the size of the battery device in the third direction will not be increased due to the need to reserve space between the first box body and the battery cells for arranging the busbars, reducing the size of the battery device in the third direction and improving the energy density of the battery device.

[0038] Based on the above technical solutions, the present application has at least the following beneficial effects:

[0039] In some embodiments, the busbar assembly is embedded in the wall body of the first box body, and the busbar assembly does not protrude beyond the wall body of the first box body in the third direction. Therefore, the size of the battery device in the third direction will not be increased due to the arrangement of the busbar assembly, reducing the size of the battery device in the third direction and improving the energy density of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the drawings without creative efforts.

[0041] Figure 1 is a schematic structural diagram of a vehicle disclosed in some embodiments of the present application;

[0042] Figure 2 is an exploded structural diagram of a battery device disclosed in some embodiments of the present application;

[0043] Figure 3 is an exploded structural diagram of a battery cell disclosed in some embodiments of the present application;

[0044] Figure 4 is an exploded structural diagram of a battery cell group and a first box body disclosed in some embodiments of the present application;

[0045] Figure 5 Schematic diagram of the battery cell group disposed in the first box according to some embodiments of the present application;

[0046] Figure 6 Schematic diagram of the first side of the battery cell group according to some embodiments of the present application;

[0047] Figure 7 Top view schematic diagram of the battery cell group disposed in the first box according to some embodiments of the present application;

[0048] Figure 8 is Figure 7 A - A cross - sectional schematic diagram of

[0049] Figure 9 is Figure 8 Enlarged schematic diagram of the local structure B in

[0050] Figure 10 is Figure 9 Enlarged schematic diagram of the local structure C in

[0051] Figure 11 Exploded view schematic diagram of a first box according to some embodiments of the present application;

[0052] Figure 12 Top view schematic diagram of a first box according to some embodiments of the present application.

[0053] In the drawings, the drawings are not drawn to actual scale.

[0054] Marking description: 1 - box; 11 - first box; 111 - process hole; 112 - groove; 113 - wall body; 114 - opening; 12 - second box; 13 - insulating part; 14 - support part; 20 - battery cell group; 2 - battery cell; 21 - housing; 22 - end cover; 23 - electrode assembly; 24 - pole column; 241 - first pole column; 242 - second pole column; 24a - first pole column row; 24b - second pole column row; 25 - explosion - proof valve; 26 - first side; 27 - second side; 30 - bus bar assembly; 301 - first bus bar; 302 - second bus bar; 3 - bus bar part; 31 - detection hole; 4 - wire harness assembly; 5 - accommodation area; 6 - first colloid; 100 - battery device; 200 - vehicle; 201 - axle; 202 - wheel; 203 - motor; 204 - controller. Detailed implementation manners

[0055] The following further describes in detail the implementation manners of the present application with reference to the drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0056] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0057] The orientation words appearing in the following description are all the directions shown in the figures and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0058] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric motorcycles and electric cars, as well as many other fields. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0059] The battery disclosed in the embodiments of the present application can be used as the power source of an electrical device or as the energy storage element of various energy storage systems.

[0060] The electrical device can be a mobile phone, a portable device, a laptop computer, a battery car, an electric vehicle, a ship, an electric toy, an electric tool, etc. Among them, the electric toy includes fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys; the electric tool includes metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, etc., such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers.

[0061] For the convenience of description, the following embodiments will take a vehicle 200, which is an electrical device provided by some embodiments of the present application, as an example for description.

[0062] Refer to Figure 1 ,Figure 1 Schematic structural diagram of vehicle 200 provided for some embodiments of the present application. Vehicle 200 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is disposed inside vehicle 200. The battery device 100 can be disposed at the bottom, head or tail of vehicle 200. The battery device 100 can be used for power supply of vehicle 200. For example, the battery device 100 can be used as the operating power source of vehicle 200. Vehicle 200 can also include an axle 201, wheels 202 connected to the axle 201, as well as a motor 203 and a controller 204. The motor 203 is used to drive the axle 201 to rotate, and the controller 204 is used to control the operation of the motor 203. The battery device 100 can be used to provide electrical energy for the operation of the motor 203 and other components in the vehicle.

[0063] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of vehicle 200, but also be used as the driving power source of vehicle 200, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 200.

[0064] Reference Figure 2 , Figure 2 Exploded structural diagram of the battery device 100 provided for some embodiments of the present application. The battery device 100 includes a box body 1 and battery cells 2. The battery cells 2 are accommodated in the box body 1. The box body 1 includes a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 cover each other. The first box body 11 and the second box body 12 together define an accommodation space for accommodating the battery cells 2. The first box body 11 can be a hollow structure with one end open, and the second box body 12 can be a plate-like structure. The second box body 12 covers the open side of the first box body 11 so that the first box body 11 and the second box body 12 together define the accommodation space; the first box body 11 and the second box body 12 can also both be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 1 formed by the first box body 11 and the second box body 12 can be in various shapes, such as: a cylinder or a cuboid, etc.

[0065] There can be multiple battery cells 2, and the multiple battery cells 2 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 2. The multiple battery cells 2 can be connected in series, parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 2 is accommodated in the box body 1. Of course, the battery device 100 can also be such that multiple battery cells 2 are first connected in series, parallel, or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the box body 1. The battery device 100 can also include other components. For example, the battery device 100 can also include a busbar assembly (CCS) for realizing the electrical connection among the multiple battery cells 2.

[0066] The battery cell 2 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 2 can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc.

[0067] Reference Figure 3 , Figure 3 is a schematic exploded view of the battery cell 2 provided in some embodiments of the present application.

[0068] The battery cell 2 includes a housing 21, an end cap 22, and an electrode assembly 23. The housing 21 is determined according to the shape after combining one or more electrode assemblies 23. For example, the housing 21 can be a hollow cuboid, cube, or cylinder, and one of the surfaces of the housing 21 has an opening for placing one or more electrode assemblies 23 inside the housing 21. For example, when the housing 21 is a hollow cuboid or cube, one of the flat surfaces of the housing 21 is the opening surface, that is, this flat surface does not have a housing wall and thus the inside and outside of the housing 21 communicate with each other. When the housing 21 is a hollow cylinder, the circular side surface of the housing 21 is the opening surface, that is, this circular side surface does not have a housing wall and thus the inside and outside of the housing 21 communicate with each other. The end cap 22 is connected to the housing 21 at the opening of the housing 21 to form a closed outer shell for placing the electrode assembly 23.

[0069] The end cap 22 is basically in a flat plate shape, and two terminal posts 24 are provided on the end cap 22. The two terminal posts 24 include a positive terminal post and a negative terminal post. An explosion-proof valve 25 can also be provided on the end cap 22. When too much gas is generated in the battery cell 2 and the gas expands to cause the air pressure inside the housing to rise above a preset value, the explosion-proof valve 25 can crack, resulting in the communication between the inside and outside of the housing, and the gas is released outward through the crack of the explosion-proof valve 25, thereby avoiding an explosion.

[0070] Reference Figure 4 and Figure 5, during the process of installing the battery cell 2 in the box body 1, the battery cell 2 can be first installed in the first box body 11, and then the second box body 12 is buckled, and the second box body 12 and the first box body 11 are connected. Since there are multiple battery cells 2 in the box body 1, a plurality of battery cells 2 arranged in sequence along the first direction X are taken as a battery cell group 20, and multiple battery cell groups 20 can be provided in the box body 1, and the multiple battery cell groups 20 are arranged in sequence along the second direction Y.

[0071] The first direction X intersects with the second direction Y. Optionally, the first direction X is perpendicular to the second direction Y. The direction from the first box body 11 to the second box body 12 is the third direction Z. The third direction Z intersects with the first direction X and the second direction Y respectively. Optionally, the third direction Z is perpendicular to the first direction X and the second direction Y respectively.

[0072] In some related technologies, in order to realize the electrical connection between multiple battery cells 2, a space is reserved between the multiple battery cells 2 and the first box body 11 along the third direction Z for setting a CCS (Cell Connector System, battery cell connection system, or integrated busbar, wire harness board integrated component, etc.). Since an assembly gap and a margin space need to be reserved between the battery cell 2 and the first box body 11 in the third direction Z, the overall size of the battery device 100 in the third direction Z is large, resulting in a reduction in energy density.

[0073] Based on this, some embodiments of the present application provide a battery device, an electrical device, and a preparation method for a battery box body to alleviate the problem of low battery energy density.

[0074] Refer to Figure 2 、 Figure 4 and Figure 5 , the battery device includes a battery cell group 20, a first box body 11, a second box body 12, and a busbar assembly 30.

[0075] The first box body 11 and the second box body 12 are buckled with each other to form a space for accommodating the battery cell group 20.

[0076] The busbar assembly 30 is embedded in the wall body 113 of the first box body 11, and the busbar assembly 30 is electrically connected to the battery cell group 20.

[0077] In some embodiments, the battery cell group 20 includes at least two battery cells 2 arranged along the first direction X.

[0078] In the above embodiments, the first box body 11 and the second box body 12 are buckled with each other to form a space for accommodating the battery cell group 20. The battery cell group 20 is arranged in the accommodating space formed by the mutual buckling of the first box body 11 and the second box body 12. The busbar assembly 30 is embedded in the wall body of the first box body 11, and the busbar assembly 30 is correspondingly electrically connected to the battery cell group 20.

[0079] In the above embodiments, the busbar assembly 30 includes a busbar 3, which is also known as a connection piece, an aluminum bar, etc. The busbar assembly 30 is a component for electrically connecting a plurality of battery cells 2 in series and / or in parallel. After a plurality of battery cells 2 are connected in series and / or in parallel through the busbar assembly 30, they have a relatively high voltage. Therefore, this side with the busbar assembly 30 is sometimes referred to as the high-voltage side.

[0080] In the above embodiments, through the busbar assembly 30, electrical connection between a plurality of battery cells 2 can be achieved, so that a plurality of battery cells 2 can be connected in series, in parallel, or in a hybrid connection. The busbar assembly 30 is embedded in the wall body 113 of the first box body 11, and the busbar assembly 30 does not exceed the wall body 113 of the first box body 11 in the third direction Z. Therefore, the size of the battery device 100 in the third direction Z is not increased due to the setting of the busbar assembly 30, the size of the battery device 100 in the third direction Z is reduced, and the energy density of the battery device 100 is improved.

[0081] In the above embodiments, the busbar assembly 30 is used to achieve electrical connection with the battery cell group 20. The busbar assembly 30 is made of a conductive material. For example, the busbar 3 in the busbar assembly 30 is made of a metal conductive material. The busbar assembly 30 is embedded in the wall body 113 of the first box body 11. Therefore, the overall stiffness of the first box body 11 can also be improved through the busbar assembly 30, and the load capacity of the first box body 11 is increased.

[0082] In some embodiments, the busbar 3 is made of aluminum.

[0083] In some embodiments, the first box body 11 is located below the second box body 12. Alternatively, the first box body 11 is located above the second box body 12. That is to say, the first box body 11 can be the lower box body of the battery device 100, and the wall body 113 of the first box body 11 is the bottom wall of the battery box body 1 and also the bottom wall of the battery assembly. The first box body 11 can also be the upper box body of the battery device 100.

[0084] Reference Figures 6 to 10 , in some embodiments, the battery cell group 20 includes battery cells 2, the busbar assembly 30 includes a busbar 3, the battery cell 2 is provided with a pole 24, and an opening 114 is provided at a position on the wall body 113 of the first box body 11 corresponding to the pole 24, and the pole 24 passes through the opening 114 and is in contact connection with the busbar 3.

[0085] In the above embodiments, the pole post 24 passes through the opening 114 and is in contact connection with the bus bar 3, enabling electrical connection between the battery cell 2 and the bus bar 3. The contact connection between the bus bar 3 and the pole post 24 does not require other components to be provided in the third direction Z, will not increase the size of the battery device 100 in the third direction Z, and can improve the energy density of the battery device 100.

[0086] In the above embodiments, each battery cell 2 includes two pole posts 24, namely a positive pole post and a negative pole post. The number of battery cells 2 is multiple, and the number of bus bars 3 is also multiple. Each bus bar 3 is correspondingly electrically connected to one pole post 24 of the battery cell 2 to achieve electrical connection between multiple battery cells 2 through the bus bar 3, so that multiple battery cells 2 can be connected in series, in parallel, or in a mixed connection.

[0087] In some embodiments, the pole post 24 passes through the opening 114 and is in direct contact connection with the bus bar 3.

[0088] In some embodiments, the bus bar 3 is welded to the pole post 24.

[0089] In the above embodiments, welding the bus bar 3 to the pole post 24 can enable the battery cell 2 to be fixedly connected to the first box body 11, improve the vibration consistency between the battery cell 2 and the first box body 11, reduce the problem of collision between the battery cell 2 and the first box body 11, and improve the integrity of the battery device 100.

[0090] Reference Figures 6 to 10 , in some embodiments, the pole post 24 is provided on the first side surface 26 of the battery cell 2, and the number of pole posts 24 is two. An accommodation area 5 is formed between the two pole posts 24, the wall body 113 of the first box body 11, and the first side surface 26 of the battery cell 2. The accommodation area 5 is filled with a first colloid 6, and the first colloid 6 bonds the battery cell 2 and the first box body 11.

[0091] In the above embodiments, the first side surface 26 of the battery cell 2 and the wall body 113 of the first box body 11 are bonded by the first colloid 6, strengthening the firmness of the connection between the battery cell 2 and the first box body 11, improving the vibration consistency between the battery cell 2 and the first box body 11, reducing the problem of collision between the battery cell 2 and the first box body 11, and improving the integrity of the battery device 100.

[0092] In some embodiments, the first side surface 26 of the battery cell 2 is adjacent to the first box body 11. The first side surface 26 is provided with a pole post 24, and the pole post 24 extends towards the first box body 11 and passes through the opening 114 to be in contact connection with a bus bar 3.

[0093] In some embodiments, the busbar 3 embedded in the wall 113 of the first box body 11 is welded to the pole 24 of the battery cell 2, and the first side surface 26 of the battery cell 2 is bonded to the wall 113 of the first box body 11 through the first colloid 6. The above-mentioned metal welding + structural adhesive bonding method is adopted to increase the bonding depth between the battery cell 2 and the first box body 11, which can greatly improve the integrity of the battery device 100, reduce the collision between the battery cell 2 and the first box body 11, and improve the safety of the battery device 100.

[0094] refer to Figure 9 In some embodiments, the pole 24 is disposed on the first side 26 of the battery cell 2, and the number of the poles 24 is two, and a receiving area 5 is formed between the two poles 24, the wall 113 of the first box body 11, and the first side 26 of the battery cell 2. The battery device further includes a wiring harness assembly 4, which is disposed in the receiving area 5.

[0095] In the above embodiment, the wiring harness assembly 4 is arranged between the first side surface 26 and the wall 113 of the first box body 11, and the space between the first side surface 26 of the battery cell 2 and the wall 113 of the first box body 11 is cleverly utilized. Due to the space generated by the arrangement of the pole 24, the size of the battery device 100 in the third direction Z will not be increased due to the need to arrange the wiring harness assembly 4, thereby reducing the overall size of the battery device 100 in the third direction Z and improving the energy density of the battery device 100.

[0096] In some embodiments, the first colloid 6 is disposed around the circumference of the wiring harness assembly 4 .

[0097] In the above embodiment, the first colloid 6 is arranged circumferentially around the wiring harness assembly 4, which can not only fix the wiring harness assembly 4 and reduce the shaking of the wiring harness assembly 4, but also increase the combination depth of the wiring harness assembly 4, the battery cell 2 and the first box body 11, and improve the vibration consistency of the wiring harness assembly 4, the battery cell 2 and the first box body 11.

[0098] In some embodiments, the wall 113 of the first box body 11, the busbar assembly 30 and the wiring harness assembly 4 form a CCS (Cell Connector System, battery cell connection system, integrated busbar, wiring harness board integration). The CCS is a key component in the battery device 100 responsible for the electrical connection between the battery cells 2. It ensures that the current between the battery cells 2 can flow smoothly, thereby realizing the storage and release of electrical energy.

[0099] In some embodiments, the wiring harness assembly 4 includes detection wires or signal wires, etc.

[0100] In some embodiments, a process hole 111 is provided on a side of the wall 113 of the first box body 11 facing away from the opening 114 .

[0101] In the above embodiment, the opening 114 and the process hole 111 are respectively located on both sides of the bus bar 3. The bus bar 3 is embedded in the wall 113 of the first box body 11. An opening 114 is provided on the side of the bus bar 3 facing the inside of the box body 1, and a process hole 111 is provided on the side of the bus bar 3 facing the outside of the box body 1.

[0102] In the above embodiment, in order to realize the connection between the bus bar 3 and the pole 24, a process hole 111 is provided on the side of the wall 113 of the first box body 11 that is away from the opening 114. The position of the process hole 111 corresponds to that of the bus bar 3, so as to allow relevant equipment to pass through and realize the connection between the bus bar 3 and the pole 24, facilitating the connection operation between the bus bar 3 and the pole 24.

[0103] The connection process between the first box body 11 and the battery cell 2 is as follows: The first side 26 of the battery cell 2 where the pole 24 is provided faces the first box body 11, so that the pole 24 passes through the opening 114 provided on the wall 113 of the first box body 11 and is in contact connection with the embedded bus bar 3; then, operate the relevant equipment to pass through the process hole 111 to further connect the bus bar 3 and the pole 24. Optionally, the relevant equipment includes operating equipment, and operate the welding equipment to pass through the process hole 111 to weld the bus bar 3 and the pole 24.

[0104] Reference Figure 8 and Figure 9 In some embodiments, the battery device 100 further includes an insulating member 13, and the insulating member 13 is provided on the side of the first box body 11 facing away from the battery cell 2 and covers the process hole 111.

[0105] In the above embodiment, since the position of the process hole 111 corresponds to that of the bus bar 3, in order to reduce the risk of electric leakage or electric shock, an insulating member 13 is provided on the side of the first box body 11 facing away from the battery cell 2, and the process hole 111 is covered by the insulating member 13, reducing the electric leakage or electric shock risk of the battery device 100.

[0106] In some embodiments, since a plurality of bus bars 3 are embedded in the wall 113 of the first box body 11, a plurality of process holes 111 are correspondingly provided on the first box body 11. In order to cover the plurality of process holes 111, an integral insulating member 13 can be provided to cover all the process holes 111.

[0107] In some embodiments, the insulating member 13 is adhesively bonded to the side of the first box body 11 facing away from the battery cell 2 through a colloid.

[0108] In some embodiments, the insulating member 13 includes insulating films such as a PC insulating film and a thermoplastic PP continuous fiber tape.

[0109] In some embodiments, a detection hole 31 is provided on the bus bar 3.

[0110] In the above embodiments, a detection hole 31 is provided on the bus bar 3. The detection hole 31 can be used to align the bus bar 3 and the terminal post 24, and can also be used to detect the connection quality between the bus bar 3 and the terminal post 24.

[0111] Reference Figure 6 , in some embodiments, the battery cell group 20 includes at least two battery cells 2 arranged along the first direction X. Two terminal posts 24 are provided on each battery cell 2. One of the terminal posts 24 of each battery cell 2 forms a first terminal post row 24a along the first direction X, and the other terminal post 24 of each battery cell 2 forms a second terminal post row 24b along the first direction X; the first terminal post row 24a and the second terminal post row 24b are arranged along the second direction Y.

[0112] Reference Figure 4 , the bus bar assembly 30 includes a first bus bar 301 and a second bus bar 302 arranged along the second direction Y. The first bus bar 301 and the second bus bar 302 each include at least two bus bars 3 arranged along the first direction X.

[0113] Each terminal post 24 in the first terminal post row 24a is electrically connected to each bus bar 3 in the first bus bar 301 in a one-to-one correspondence.

[0114] Each terminal post 24 in the second terminal post row 24b is electrically connected to each bus bar 3 in the second bus bar 302 in a one-to-one correspondence.

[0115] In Figure 6 the illustrated embodiment, two terminal posts 24 are provided on each battery cell 2, namely a first terminal post 241 and a second terminal post 242. Among them, the first terminal post 241 is the positive terminal post, and the second terminal post 242 is the negative terminal post. When the battery cells 2 are connected in series, the terminal posts 24 in the first terminal post row 24a are alternately arranged with the first terminal post 241 and the second terminal post 242; the terminal posts 24 in the second terminal post row 24b are alternately arranged with the second terminal post 242 and the first terminal post 241. Of course, the battery cells 2 can also be connected in parallel. The terminal posts 24 in the first terminal post row 24a are all the first terminal post 241 or the second terminal post 242; the terminal posts 24 in the second terminal post row 24b are all the second terminal post 242 or the first terminal post 241.

[0116] In the above embodiments, the battery cell group 20 includes at least two battery cells 2 arranged along the first direction X. Two pole columns 24 are provided on each battery cell 2. The busbar assembly 30 includes a plurality of busbars 3. Each pole column 24 is electrically connected to a corresponding busbar 3 to achieve the electrical connection between the battery cell group 20 and the busbar assembly 30, enabling the current between the battery cells 2 to flow smoothly, thereby realizing the storage and release of electrical energy. The plurality of busbars 3 are embedded in the wall body 113 of the first box body 11, which can improve the stiffness of the first box body 11. The busbars 3 are embedded in the wall body 113 of the first box body 11, and the size of the battery device 100 in the third direction Z will not increase due to the need to reserve space between the first box body 11 and the battery cells 2 for arranging the busbars 3, reducing the overall size of the battery device 100 in the third direction Z and improving the energy density of the battery device 100.

[0117] In some embodiments, the battery device 100 further includes at least two battery cell groups 20 arranged along the second direction Y and at least two busbar assemblies 30 arranged along the second direction Y. Each battery cell group 20 is electrically connected to a corresponding busbar assembly 30.

[0118] In some embodiments, the wall body 113 of the first box body 11 is the bottom wall of the battery device.

[0119] In the above embodiments, the wall body 113 of the first box body 11 is the bottom wall of the battery device, that is, the bottom wall of the box body 1. The busbar assembly 30 is embedded in the wall body 113 of the first box body 11, which can improve the stiffness of the first box body 11 through the busbar assembly 30, reduce the deformation amount of the first box body 11 after being loaded, and enable the first box body 11 as the bottom wall to provide better support for the battery cells 2.

[0120] In some embodiments, the first box body 11 and the busbar assembly 30 are integrally formed by injection molding.

[0121] In the above embodiments, the first box body 11 is injection-molded, which can reduce the weight of the first box body 11; the first box body 11 and the busbar assembly 30 are integrally formed by injection molding, which can embed the busbar assembly 30 into the wall body 113 of the first box body 11, reduce the processing procedures and processing costs, improve the connection strength between the busbar assembly 30 and the first box body 11, and reduce quality problems such as the busbar assembly 30 falling off the first box body 11 during the transportation process; furthermore, compared with a box body with a single injection-molded structure, the busbar assembly 30 is embedded in the wall body 113 of the first box body 11, which can improve the stiffness of the first box body 11 through the busbar assembly 30, reduce the deformation amount of the first box body 11 after being loaded, and enable the first box body 11 to provide better support for the battery cell group 20. And, the first box body 11 and the busbar assembly 30 are integrally formed by injection molding, which can improve the frequency synchronization between the first box body 11 and the busbar assembly 30, reduce mutual vibration, and improve the integrity of the battery device 100. Furthermore, the busbar assembly 30 is injection-molded and embedded in the wall body 113 of the first box body 11, which will not increase the size of the battery device 100 in the third direction Z due to the need to reserve space between the first box body 11 and the battery cell group 20 for arranging the busbar assembly 30, reduce the overall size of the battery device 100 in the third direction Z, and improve the energy density of the battery device 100.

[0122] In the above embodiments, the injection molding material used to prepare the first box body 11 by injection molding process includes thermoplastic material or thermosetting material.

[0123] In some embodiments, the first box body 11 and the busbar assembly 30 are integrally formed by compression molding.

[0124] In the above embodiments, the first box body 11 is formed by molding, which can reduce the weight of the first box body 11; the first box body 11 and the busbar assembly 30 are integrally formed by molding, which can embed the busbar assembly 30 in the wall body 113 of the first box body 11, reduce the processing procedures and processing costs, improve the connection strength between the busbar 3 and the first box body 11, and reduce quality problems such as the busbar assembly 30 falling off the first box body 11 during the transportation process; furthermore, compared with a box body with a single molded structure, the busbar assembly 30 is embedded in the wall body 113 of the first box body 11, which can improve the stiffness of the first box body 11 through the busbar assembly 30, reduce the deformation amount of the first box body 11 after being loaded, and enable the first box body 11 to provide better support for the battery cell group 20. And, the first box body 11 and the busbar assembly 30 are integrally formed by molding, which can improve the frequency synchronization between the first box body 11 and the busbar assembly 30, reduce mutual vibration, and improve the integrity of the battery device 100. Furthermore, the busbar assembly 30 is embedded in the wall body 113 of the first box body 11 through a molding process, and the size of the battery device 100 in the third direction Z will not increase due to the need to reserve space between the first box body 11 and the battery cell group 20 for setting the busbar assembly 30, reducing the overall size of the battery device 100 in the third direction Z and improving the energy density of the battery device 100.

[0125] In the above embodiments, the molding material used for the first box body 11 includes thermosetting materials.

[0126] In some embodiments, the first box body 11 further includes a support member 14, and the support member 14 is used to better support the battery cell group 20. The support member 14 is a part of the first box body 11 and is formed during the injection molding or molding process of the first box body 11.

[0127] Reference Figure 10 and Figure 12 and, in some embodiments, the busbar assembly 30 includes a busbar 3, a groove 112 is provided on the wall body 113 of the first box body 11, the busbar 3 is provided in the groove 112, the battery cell group 20 includes battery cells 2, and the battery cells 2 are provided with electrode posts 24, and the electrode posts 24 are connected to the busbar 3.

[0128] In the above embodiments, a groove 112 is provided in the wall body 113 of the first box body 11, the busbar 3 is provided in the groove 112, and the busbar 3 does not exceed the groove 112, so an opening 114 exposing the busbar 3 is naturally formed on the wall body 113 of the first box body 11. Therefore, the size of the first box body 11 in the third direction Z will not change after the busbar 3 is provided, and the size of the battery device 100 in the third direction Z will not increase due to the need to reserve space between the first box body 11 and the battery cell 2 for setting the busbar 3, reducing the overall size of the battery device 100 in the third direction Z and improving the energy density of the battery device 100.

[0129] In some embodiments, the bus bar 3 and the groove 112 are connected by a second colloid.

[0130] In the above embodiments, the bus bar 3 and the groove 112 are connected by a second colloid, with a simple process and convenient operation.

[0131] In some embodiments, the side of the battery cell group 20 facing away from the first box body 11 and the second box body 12 are connected by a third colloid.

[0132] In the above embodiments, the second box body 12 and the battery cell group 20 are connected by a third colloid, which increases the bonding depth between the battery cell group 20 and the second box body 12, can greatly improve the integrity of the battery device 100, reduce the collision between the battery cell group 20 and the second box body 12, and improve the safety of the battery device 100.

[0133] In some embodiments, the second side 27 of the battery cell 2 and the second box body 12 are connected by a third colloid. The second side 27 is the side opposite to the first side 26, which can greatly increase the bonding depth between the battery cell group 20 and the second box body 12; combined with the fact that the first side 26 of the battery cell 2 and the first box body 11 are bonded by a colloid, and the pole 24 of the battery cell 2 is welded to the bus bar 3 embedded in the wall body 113 of the first box body 11, the bonding depth between the battery cell group 20 and the first box body 11 can be greatly increased; therefore, the collision between the battery cell group 20 and the first box body 11 and the second box body 12 can be greatly reduced, and the integrity and safety of the battery device 100 can be improved.

[0134] In some embodiments, the battery device 100 further includes a cooling component, and the cooling component is used to cool the battery cell group 20 to reduce the risk of thermal runaway.

[0135] In some embodiments, the cooling component can be disposed between the second box body 12 and the battery cell group 20.

[0136] In some embodiments, the cooling component can also be disposed on the side of the battery cell group 20 that is neither the first side 26 nor the second side 27, and the side with a larger area can be selected to dispose the cooling component to improve the cooling effect.

[0137] Some embodiments of the present application also provide an electrical device, which includes the above battery device 100.

[0138] The electrical device provided by the embodiments of the present application includes the battery device 100 provided by the embodiments of the present application, and accordingly has the beneficial effects of the battery device 100.

[0139] Some embodiments of the present application also provide a method for manufacturing a battery box body. The battery box body includes the first box body 11 in the above embodiments. The manufacturing method includes the following steps:

[0140] Place the bus bar 3 into the mold for manufacturing the first box body 11, inject materials into the mold, and integrally form the first box body 11 with the bus bar 3 embedded therein through an injection molding process.

[0141] In the above embodiment, the first box body 11 is injection-molded, which can reduce the weight of the first box body 11; the first box body 11 and at least two bus bars 3 are integrally formed by injection molding, which can embed the bus bar 3 into the wall body 113 of the first box body 11, reduce the processing procedures and processing costs, improve the connection strength between the bus bar 3 and the first box body 11, and reduce quality problems such as the bus bar 3 falling off from the first box body 11 after the transportation process; furthermore, compared with a box body with a single injection-molded structure, the bus bar 3 is embedded in the wall body 113 of the first box body 11, which can improve the stiffness of the first box body 11 through the bus bar 3, reduce the deformation amount of the first box body 11 after being loaded, and enable the first box body 11 to provide better support for the battery cell group 20. And, the first box body 11 and at least two bus bars 3 are integrally formed by an injection molding process, which can improve the synchronization degree between the first box body 11 and the bus bar 3, reduce vibration, and improve the integrity of the battery device 100. Furthermore, the bus bar 3 is injection-molded and embedded in the wall body 113 of the first box body 11, which will not increase the size of the battery device 100 in the third direction Z due to the need to reserve space between the first box body 11 and the battery cell group 20 for setting the bus bar 3, reduce the overall size of the battery device 100 in the third direction Z, and improve the energy density of the battery device 100.

[0142] In the above embodiment, the injection molding material used for manufacturing the first box body 11 by the injection molding process includes thermoplastic materials or thermosetting materials.

[0143] The first box body 11 is injection-molded with thermoplastic materials or thermosetting materials, which can reduce the weight compared with a box body made of metal materials.

[0144] Some embodiments of the present application also provide a method for manufacturing a battery box body. The battery box body includes the first box body 11 in the above embodiments. The manufacturing method includes the following steps:

[0145] Place the bus bar 3 into the mold for manufacturing the first box body 11. First, inject materials on one side in the thickness direction (the third direction Z) of the bus bar 3, and then inject materials on the other side in the thickness direction (the third direction Z) of the bus bar 3, and integrally form the first box body 11 with the bus bar 3 embedded therein through a two-shot injection molding process.

[0146] In the above embodiments, the bus bar member 3 and the first box body 11 are integrally formed by a two-shot injection molding process, which can reduce quality problems such as voids around the bus bar member 3 and easy detachment of the bus bar member 3 caused by the overly large volume of the first box body 11 and insufficient injection of materials around the bus bar member 3, that is, the primary material cannot fill completely.

[0147] Some embodiments of the present application also provide a method for manufacturing a battery box body. The battery box body includes the first box body 11 in the above embodiments. The manufacturing method includes the following steps:

[0148] Place two layers of fiber cloth in the mold for manufacturing the first box body 11, and fix the bus bar member 3 between the two layers of fiber cloth. Among them, windows for exposing the connection surface of the bus bar member 3 (the connection surface connected to the pole 24) are reserved on the two layers of fiber cloth;

[0149] Close the mold and inject materials into the mold cavity, and integrally form the first box body 11 with the bus bar member 3 embedded therein through a molding process.

[0150] In the above embodiments, the two layers of fiber cloth are used to fix the bus bar member 3, and windows for exposing the connection surface of the bus bar member 3 are reserved on the two layers of fiber cloth. The injected materials avoid the window area, so that after the first box body 11 and the bus bar member 3 are molded, the connection surface between the bus bar member 3 and the pole 24 is exposed, which will not affect the welding between the bus bar member 3 and the pole 24.

[0151] In the above embodiments, the first box body 11 is formed by molding, which can reduce the weight of the first box body 11; the first box body 11 and at least two bus bar members 3 are integrally formed by molding, which can embed the bus bar member 3 in the wall body 113 of the first box body 11, reduce the processing procedures and processing costs, improve the connection strength between the bus bar member 3 and the first box body 11, and reduce quality problems such as detachment of the bus bar member 3 from the first box body 11 after the transfer process; furthermore, compared with a box body with a single molding structure, the bus bar member 3 is embedded in the wall body 113 of the first box body 11, which can improve the stiffness of the first box body 11 through the bus bar member 3, reduce the deformation amount of the first box body 11 after being loaded, and enable the first box body 11 to provide better support for the battery cell 2. And, the first box body 11 and at least two bus bar members 3 are integrally formed by molding, which can improve the synchronization frequency between the first box body 11 and the bus bar member 3, reduce vibration, and improve the integrity of the battery device 100. Furthermore, the bus bar member 3 is embedded in the wall body 113 of the first box body 11 through a molding process, and it will not increase the size of the battery device 100 in the third direction Z due to the need to reserve space between the first box body 11 and the battery cell 2 for arranging the bus bar member 3, reduce the size of the battery device 100 in the third direction Z, and improve the energy density of the battery device 100.

[0152] In the above embodiments, the compression molding material used to prepare the first box body 11 includes a thermosetting material. The first box body 11 is compression molded with a thermosetting material, which can reduce the weight compared to a box body made of metal material.

[0153] Some specific embodiments of integrally molding the first box body 11 and the bus bar 3 are listed below.

[0154] In the first embodiment, through an injection molding process, the bus bar 3 is prefabricated and placed in a mold, and materials are injected into the mold, so that the first box body 11 and the bus bar 3 are formed into an integral structure through the injection molding process. Alternatively, through a two-shot injection molding process, materials are injected on both the front and back sides of the bus bar 3 successively, so that the first box body 11 and the bus bar 3 are formed into an integral structure through the two-shot injection molding process.

[0155] Among them, the operation steps for forming the first box body 11 and the bus bar 3 into an integral structure through the injection molding process include the following:

[0156] In an injection mold, place the bus bar 3, nuts, etc.

[0157] Close the mold and inject molten plastic into the cavity.

[0158] Cool and solidify.

[0159] Open the mold and eject, and the injection-molded first box body 11 with the bus bar 3 or inserts such as nuts can be completed.

[0160] Among them, the nuts embedded in the first box body 11 can be used to connect with the second box body 12.

[0161] In the above embodiments, after the first box body 11 and the bus bar 3 are integrally formed by injection molding, except for the necessary connection surfaces, the rest of the bus bar 3 can be buried in the plastic layer of the first box body 11 formed by injection molding.

[0162] Specifically, after the first box body 11 and the bus bar 3 are integrally formed by injection molding, the two side surfaces of the bus bar 3 in the thickness direction are partially exposed for connecting with the pole 24 of the battery cell 2.

[0163] The connection process between the first box body 11 and the battery cell 2 includes the following steps:

[0164] The terminal post 24 of the battery cell 2 faces upward. After arranging multiple battery cells 2 in sequence, the first box body 11 formed by injection molding is inverted, so that the bus bar 3 embedded in the first box body 11 is aligned with the terminal post 24 of the battery cell 2, and the terminal post 24 is connected to the position of the bus bar 3 exposed outside the wall body 113. The position of the terminal post 24 is captured through the process hole 111 on the first box body 11 and the detection hole 31 provided on the bus bar 3, and the bus bar 3 and the terminal post 24 are welded. After welding, an insulating member 13 is arranged on the side of the first box body 11 facing away from the battery cell 2, and the insulating member 13 shields the process hole 111. Optionally, the insulating member 13 and the first box body 11 are bonded by structural adhesive. Thus, the process of welding the inverted battery cell 2 to the injection-molded first box body 11 is completed. According to the main frequency requirement of the battery device 100, the first box body 11 and the first side surface 26 of the battery cell 2 are glued with structural adhesive; the second box body 12 and the second side surface 27 of the battery cell 2 can also be glued to increase the integrity of the battery device 100.

[0165] The injection molding materials for preparing the first box body 11 include thermoplastic materials or thermosetting materials such as PP (Polypropylene), PA6 nylon plastic, PC (Polycarbonate), ABS (Acrylonitrile Butadiene Styrene), PBT (Polybutylene Terephthalate), etc., and strength additives such as fibers and talcum powder with different components can be added according to the structural strength.

[0166] The insulating member 13 includes insulating films such as PC insulating film and thermoplastic PP continuous fiber tape.

[0167] In the first embodiment, the bus bar 3 is hung in the mold in advance using a manipulator and a tooling, and the bus bar 3 and the first box body 11 are integrally formed, which has the following beneficial effects.

[0168] 1. The process of secondary assembly on the production line is omitted, improving the process convenience of this component. For the integrally injection-molded first box body 11, the consistency of the position degrees of the bus bars 3 in the wall body 113 of the first box body 11 is higher, and there is no risk of transfer and assembly falling off. The injection-molded first box body 11 has an insulating advantage, and the first box body 11 with the embedded bus bar 3 can replace two components, namely the CCS and the first box body 11, reducing the number of materials, processes and costs.

[0169] 2. Since the CCS and the first box body 11 are combined and arranged, the height of the battery device 100 in the third direction Z can be reduced. In some tests, the height of the battery in the third direction Z is reduced by 5 mm to 15 mm.

[0170] 3. Since the first box body 11 also needs to meet the function of the battery against thermal runaway, it itself needs to have certain ablation resistance and strength performance. Therefore, structural adhesive is used to bond between the first box body 11 and the first side 26 of the battery cell 2, and the pole column 24 of the battery cell 2 is welded to the bus bar 3 of the first box body 11. Through the form of metal welding + structural adhesive bonding, the battery cell 2 and the first box body 11 are deeply combined, which can greatly improve the battery main frequency and ensure that relevant requirements are met during the vibration process.

[0171] 4. Based on the problem of insufficient stiffness of the injection-molded box body, inserts (bus bars 3) are added inside the first box body 11, which can greatly improve the overall stiffness of the first box body 11 and increase the load-bearing capacity of the first box body 11. At the same time, through the auxiliary action of the support member 14 of the first box body 11, the ability of the first box body 11 to bear the pressure from the battery cell 2 can be improved.

[0172] In the second embodiment, the bus bar 3 is wrapped with multiple layers of fiber cloth, and resin is injected into the mold. The bus bar 3 and the first box body 11 are formed into an integral structure by using the molding process. The fiber cloth is locally cut on the welding surface of the bus bar 3, and the welding surface of the formed bus bar 3 is partially exposed to support the subsequent welding with the pole column 24 of the battery cell 2.

[0173] Among them, the bus bar 3 and the first box body 11 being formed into an integral structure by the molding process includes the following steps:

[0174] In the molding die, put the bottom layer of fiber cloth (a window has been cut out for exposing the bus bar 3);

[0175] Put the bus bar 3 insert, and then put the top layer of fiber cloth (a window has been cut out for exposing the bus bar 3);

[0176] Close the mold, and inject resin into the mold cavity to make the resin infiltrate the fiber cloth and the bus bar 3, and isolate the resin at the window opening position;

[0177] Cool and solidify;

[0178] Open the mold, and the production of the first box body 11 with the bus bar 3 insert can be completed.

[0179] In the second embodiment, forming the bus bar 3 and the first box body 11 into an integral structure by the molding process has the following beneficial effects.

[0180] The first composite material box body 11 formed by the molding process has a higher strength than the injection-molded material due to the tensile and flexural moduli of the fiber cloth and resin. On the basis of welding the busbar 3 embedded in the first box body 11 to the pole 24 of the battery cell 2 by the welding process, it is optional to additionally use structural adhesive to bond the first box body 11 to the first side 26 of the battery cell 2, and use structural adhesive to bond the second box body 12 to the second side 27 of the battery cell 2, so as to improve the battery main frequency, enable the box body 1 to carry a larger battery cell 2 capacity, and increase the single-pack power of the battery.

[0181] In the third embodiment, a molding process of molding or injection molding is used to first produce a hollow non-metallic first box body 11, and the busbar 3 is placed in the hollow part (groove 112) of the first box body 11. Finally, structural adhesive is used to fill between the non-metallic first box body 11 and the battery cell 2, and the busbar 3 and the pole 24 are welded.

[0182] The injection molding or molding die does not need to provide a fixing structure for fixing the busbar 3. After the hollow first box body 11 is formed, it is bonded to the busbar 3, and the overall process is simple.

[0183] Based on the above various embodiments, the technical solution in which the first box body 11 and the busbar 3 provided in the embodiments of the present application are formed into an integral structure by thermoplastic material or thermosetting material has the characteristics of light weight and low cost compared with the metal box body. Moreover, the busbar 3 is embedded in the first box body 11, which can improve the self-rigidity of the first box body 11. The busbar 3 is embedded in the first box body 11, which can also improve the self-rigidity of the CCS component and increase the battery main frequency. The process of forming the first box body 11 and the busbar 3 into an integral structure by thermoplastic material or thermosetting material is simple, and the busbar 3 is not easily detached from the first box body 11. In addition, there is no need to reserve a space for installing the CCS between the first box body 11 and the battery cell 2. Therefore, the height of the battery in the third direction Z can be reduced, and the energy density of the battery can be increased.

[0184] Based on the above embodiments of the present application, in the case of no clear negation or conflict, the technical features of one embodiment can be beneficially combined with one or more other embodiments.

[0185] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cell group (20); The first box body (11) and the second box body (12) are buckled together to form a space for accommodating the battery cell group (20); as well as A busbar assembly (30) is embedded in the wall (113) of the first box body (11), and the busbar assembly (30) is electrically connected to the battery cell group (20); The battery cell group (20) comprises a battery cell (2), the busbar assembly (30) comprises a busbar (3), the battery cell (2) is provided with a pole (24), an opening (114) is provided on the wall (113) of the first box (11) at a position corresponding to the pole (24), and the pole (24) passes through the opening (114) to be in contact with the busbar (3); The pole (24) is arranged on the first side surface (26) of the battery cell (2), and the number of the poles (24) is two, and a receiving area (5) is formed between the two poles (24), the wall (113) of the first box body (11) and the first side surface (26) of the battery cell (2); The battery device further comprises a wiring harness assembly (4), wherein the wiring harness assembly (4) is arranged in the accommodating area (5).

2. The battery device according to claim 1, characterized in that: The accommodating area (5) is filled with a first colloid (6), and the first colloid (6) bonds the battery cell (2) and the first box (11).

3. The battery device according to claim 2, characterized in that: The first colloid (6) is arranged around the circumference of the wiring harness assembly (4).

4. The battery device according to claim 1, characterized in that: A process hole (111) is provided on a side of the wall (113) of the first box body (11) facing away from the opening (114).

5. The battery device according to claim 4, characterized in that: It also comprises an insulating member (13), wherein the insulating member (13) is arranged on a side of the first box body (11) facing away from the battery cell (2) and covers the process hole (111).

6. The battery device according to any one of claims 1 to 5, characterized in that: The battery cell group (20) comprises at least two battery cells (2) arranged along a first direction (X), each battery cell (2) being provided with two poles (24), one pole (24) of each battery cell (2) being arranged along the first direction (X) to form a first pole row (24a), and the other pole (24) of each battery cell (2) being arranged along the first direction (X) to form a second pole row (24b); the first pole row (24a) and the second pole row (24b) being arranged along a second direction (Y); The busbar assembly (30) comprises a first busbar (301) and a second busbar (302) arranged along the second direction (Y), and the first busbar (301) and the second busbar (302) respectively comprise at least two busbars (3) arranged along the first direction (X); Each pole (24) in the first pole row (24a) is electrically connected to each busbar (3) in the first busbar (301) in a one-to-one correspondence; Each pole (24) in the second pole row (24b) is electrically connected to each bus bar (3) in the second bus bar (302) in a one-to-one correspondence.

7. The battery device according to any one of claims 1 to 5, characterized in that: The wall (113) of the first box (11) is the bottom wall of the battery device.

8. The battery device according to any one of claims 1 to 5, characterized in that: The first box body (11) and the confluence assembly (30) are integrally formed by injection molding.

9. The battery device according to any one of claims 1 to 5, characterized in that: The first box body (11) and the confluence assembly (30) are integrally formed by molding.

10. The battery device according to any one of claims 1 to 5, characterized in that: The busbar assembly (30) comprises a busbar (3); a groove (112) is provided on a wall (113) of the first box body (11); the busbar (3) is provided in the groove (112); the battery cell group (20) comprises a battery cell (2); the battery cell (2) is provided with a pole (24); the pole (24) is connected to the busbar (3).

11. The battery device according to claim 10, characterized in that: The current collector (3) and the groove (112) are connected via a second colloid.

12. The battery device according to any one of claims 1 to 5, characterized in that: The side of the battery cell group (20) facing away from the first box (11) is connected to the second box (12) via a third colloid.

13. An electrical device, characterized in that: Comprising a battery device according to any one of claims 1 to 12.

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