Battery device, power utilization device and preparation method of battery box body

Abstract

The embodiment of the invention provides a battery device, a power utilization device and a preparation method of a battery box body. The battery device comprises a battery cell group; the first box body and the second box body are buckled with each other to form a space for accommodating the battery monomer group; the confluence assembly is embedded into the wall body of the first box body, and the confluence assembly is electrically connected with the battery monomer group; the battery monomer group comprises a battery monomer, the confluence assembly comprises a confluence piece, the battery monomer is provided with a pole, an opening is formed in a position, corresponding to the pole, on the wall body of the first box body, and the pole penetrates through the opening and is in contact connection with the confluence piece; the two poles are arranged on the first side surface of the battery monomer, and an accommodating area is formed among the two poles, the wall body of the first box body and the first side surface of the battery monomer; the battery device further comprises a wire harness assembly which is arranged in the accommodating area. The size of the battery device in the third direction cannot be increased due to the arrangement of the confluence assembly, the wiring harness assembly and the like, and the energy density of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method for preparing a battery device, an electrical device, and a battery box. Background Art

[0002] In some related technologies, the battery device includes a first box, a second box and a plurality of battery cells, and the first box and the second box are interlocked to accommodate the plurality of battery cells. Space is reserved between the plurality of battery cells and the first box for setting CCS (Cell Connector System, battery cell connection system, or integrated busbar, wiring harness board integration, etc.), resulting in a higher overall height of the battery and lower energy density. Summary of the invention

[0003] Some embodiments of the present application provide a method for preparing a battery device, an electrical device, and a battery case, for alleviating the problem of low battery energy density.

[0004] Some embodiments of the present application provide a battery device, which includes: a battery cell group; a first box body and a second box body, which are interlocked to form a space for accommodating the battery cell group; and a bus assembly, which is embedded in the wall of the first box body, and the bus assembly is electrically connected to the battery cell group; the battery cell group includes a battery cell, and the bus assembly includes a bus piece, the battery cell is provided with a pole, and an opening is provided on the wall of the first box body at a position corresponding to the pole, and the pole passes through the opening to contact and connect with the bus piece; the pole is arranged on a first side surface of the battery cell, and the number of the poles is two, and a accommodating area is formed between the two poles, the wall of the first box body and the first side surface of the battery cell; the battery device also includes a wiring harness assembly, and the wiring harness assembly is arranged in the accommodating area.

[0005] In the above embodiment, the bus assembly is embedded in the wall of the first box body, and the bus assembly will not exceed the wall 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 provision of the bus 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 passes through the opening and contacts the busbar, so that the battery cell and the busbar can be electrically connected. The busbar and the pole are in contact and connected, and no other components are required in the third direction, which will not increase the size of the battery device in the third direction, and can improve the energy density of the battery device.

[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 along a first direction, each battery cell is provided with two poles, one of the poles of each battery cell is arranged along the first direction to form a first pole row, and the other pole of each battery cell forms a second pole row along the first direction; the first pole row and the second pole row are arranged along the second direction; the bus assembly includes a first bus and a second bus arranged along the second direction, the first bus and the second bus respectively include at least two bus parts arranged along the first direction; each pole in the first pole row is electrically connected to each bus part in the first bus in a one-to-one correspondence; each pole in the second pole row is electrically connected to each bus part in the second bus in a one-to-one correspondence.

[0017] In the above embodiment, the battery cell group includes at least two battery cells arranged along the first direction X, each battery cell is provided with two poles, and the bus assembly includes a plurality of bus pieces, each pole is electrically connected to a bus piece corresponding to the battery cell group, so as to realize the electrical connection between the battery cell group and the bus assembly, so that the current between the battery cells can flow smoothly, thereby realizing the storage and release of electric energy. A plurality of bus pieces are embedded in the wall of the first box body, which can improve the rigidity of the first box body. The bus piece is embedded in the wall of the first box body, 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 cell to set the bus piece, thereby 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 of the first box is the bottom wall of the battery device.

[0019] In the above embodiment, the wall of the first box body is the bottom wall of the battery device, that is, the bottom wall of the box body. The busbar assembly is embedded in the wall of the first box body. The busbar assembly can improve the rigidity of the first box body and reduce the deformation of the first box body after being loaded, so that the first box body can provide better support for the battery cell as the bottom wall.

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

[0021] In the above embodiment, 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 formed into an integral structure by injection molding, which can embed the busbar assembly into the wall 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 the quality problems such as the busbar assembly falling off from the first box body during transportation; furthermore, compared with the box body with a single injection molding structure, the busbar assembly is embedded in the wall of the first box body, which can improve the rigidity of the first box body through the busbar assembly, reduce the deformation 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 formed into an integral structure 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. Furthermore, the busbar assembly is embedded in the wall of the first box body by injection molding, 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 cell group to set the busbar assembly, thereby reducing the overall size of the battery device in the third direction and improving the energy density of the battery device.

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

[0023] In the above embodiment, the first box is formed by compression molding, which can reduce the weight of the first box; the first box and the busbar assembly are formed into an integral structure by compression molding, which can embed the busbar assembly into the wall of the first box, reduce the processing procedures and processing costs, improve the connection strength between the busbar and the first box, and reduce the quality problems such as the busbar assembly falling off from the first box during transportation; furthermore, compared with the box with a single compression molding structure, the busbar assembly is embedded in the wall of the first box, which can improve the rigidity of the first box through the busbar assembly, reduce the deformation of the first box after being loaded, and enable the first box to provide better support for the battery cell group. In addition, the first box and the busbar assembly are formed into an integral structure by compression molding, which can improve the frequency synchronization between the first box and the busbar assembly, reduce mutual vibration, and improve the integrity of the battery device. Furthermore, the busbar assembly is embedded in the wall of the first box by the compression 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 and the battery cell group to set the busbar assembly, which reduces the overall size of the battery device in the third direction and improves the energy density of the battery device.

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

[0025] In the above embodiment, a groove is provided in the wall of the first box body, and the busbar is arranged in the groove. The busbar will not exceed the groove, and an opening exposing the busbar is naturally formed on the wall of the first box body. Therefore, after the busbar is set, the size of the first box body in the third direction will not change, 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 cell to set the busbar, thereby 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 is connected to the groove via a second colloid.

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

[0028] In some embodiments, a side of the battery cell group facing away from the first box is connected to the second box via a third colloid.

[0029] In the above embodiment, the second box and the battery cell group are connected by the third colloid, which increases the depth of the combination between the battery cell group and the second box, greatly improves the integrity of the battery device, reduces the collision between the battery cell group and the second box, and improves the safety of the battery device.

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

[0031] The electric device provided in the embodiment of the present application includes the battery device provided in the embodiment of the present application, and correspondingly has the beneficial effects of the battery device.

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

[0033] In the above embodiment, 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 collectors are formed into an integral structure by injection molding, which can embed the collector into the wall of the first box body, reduce the processing procedures and processing costs, improve the connection strength between the collector and the first box body, and reduce the quality problems such as the collector falling off from the first box body after the transportation process; furthermore, compared with the box body with a single injection molding structure, the collector is embedded in the wall of the first box body, which can improve the rigidity of the first box body through the collector, reduce the deformation 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 at least two collectors are formed into an integral structure by injection molding, which can improve the frequency synchronization between the first box body and the collector, reduce vibration, and improve the integrity of the battery device. Furthermore, the collector is embedded in the wall of the first box body by injection molding, 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 cell group to set the collector, which reduces the overall size of the battery device in the third direction and improves the energy density of the battery device.

[0034] Some embodiments of the present application provide a method for preparing a battery case, wherein the battery case includes the first case in the above-mentioned embodiment, and the preparation method includes the following steps: placing a busbar into a mold for preparing the first case, first injecting material on one side of the busbar in the thickness direction, and then injecting material on the other side of the busbar in the thickness direction, and integrally forming the first case with the busbar embedded therein through a secondary injection molding process.

[0035] In the above embodiment, the busbar and the first box body are formed into an integrated structure through a secondary injection molding process, which can reduce quality problems such as gaps around the busbar and easy falling off of the busbar caused by insufficient injection of material around the busbar due to the large volume of the first box body, that is, insufficient injection of material in one time.

[0036] Some embodiments of the present application provide a method for preparing a battery case, wherein the battery case includes the first case in the above-mentioned embodiment, and the preparation method includes the following steps: placing two layers of fiber cloth in a mold for preparing the first case, fixing a busbar between the two layers of fiber cloth, wherein windows are reserved on the two layers of fiber cloth to expose the connection surface of the busbar; closing the mold and injecting material into the mold cavity, and integrally forming the first case with the busbar embedded therein through a molding process.

[0037] In the above embodiment, 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 collectors are formed into an integral structure by molding, which can embed the collector into the wall of the first box body, reduce the processing procedures and processing costs, improve the connection strength between the collector and the first box body, and reduce the quality problems such as the collector falling off from the first box body after the transportation process; furthermore, compared with the box body with a single molded structure, the collector is embedded in the wall of the first box body, which can improve the rigidity of the first box body through the collector, reduce the deformation of the first box body after being loaded, and enable the first box body to provide better support for the battery cell. In addition, the first box body and at least two collectors are formed into an integral structure by molding, which can improve the frequency synchronization between the first box body and the collector, reduce vibration, and improve the integrity of the battery device. Furthermore, the collector is embedded in the wall of the first box body by 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 cell to set the collector, which reduces the size of the battery device in the third direction and improves the energy density of the battery device.

[0038] Based on the above technical solution, this application has at least the following beneficial effects: In some embodiments, the bus assembly is embedded in the wall of the first box body, and the bus assembly will not exceed the wall 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 provision of the bus assembly, thereby 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

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0040] Figure 1 is a schematic structural diagram of a vehicle disclosed in some embodiments of the present application; Figure 2 is a schematic diagram of an exploded structure of a battery device disclosed in some embodiments of the present application; Figure 3 is a schematic diagram of the exploded structure of a battery cell disclosed in some embodiments of the present application; Figure 4 is a schematic diagram of the exploded structure of a battery cell group and a first box body disclosed in some embodiments of the present application; Figure 5 It is a structural schematic diagram of a battery cell group arranged in a first box body disclosed in some embodiments of the present application; Figure 6is a schematic diagram of a first side of a battery cell group disclosed in some embodiments of the present application; Figure 7 is a top view schematic diagram of a battery cell assembly in a first box disclosed in some embodiments of the present application; Figure 8 yes Figure 7 AA cross-sectional view of ; Fig. 9 yes Figure 8 An enlarged schematic diagram of the local structure B in FIG. Fig.10 yes Fig. 9 An enlarged schematic diagram of the local structure C in FIG. Fig.11 is a schematic diagram of an exploded structure of a first box disclosed in some embodiments of the present application; Fig.12 It is a schematic top view of a first box body disclosed in some embodiments of the present application.

[0041] In the drawings, the drawings are not drawn to scale.

[0042] Marking instructions: 1-box; 11-first box; 111-process hole; 112-groove; 113-wall; 114-opening; 12-second box; 13-insulating member; 14-support member; 20-battery cell group; 2-battery cell; 21-shell; 22-end cover; 23-electrode assembly; 24-pole; 241-first pole; 242-second pole; 24a-first pole row; 24b-second pole row; 25-explosion-proof valve; 26-first side; 27-second side; 30-bus assembly; 301-first bus; 302-second bus; 3-bus; 31-detection hole; 4-wiring harness assembly; 5-accommodating area; 6-first colloid; 100-battery device; 200-vehicle; 201-axle; 202-wheel; 203-motor; 204-controller. DETAILED DESCRIPTION

[0043] The following detailed description and drawings of the embodiments of the present application are used to 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.

[0044] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0045] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0046] At present, from the perspective of market development, 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 stations, but are 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 field of power batteries, the market demand is also constantly expanding.

[0047] The battery disclosed in the embodiments of the present application can be used as a power source for electrical devices or as an energy storage element for various energy storage systems.

[0048] The electrical devices may be mobile phones, portable devices, laptop computers, battery vehicles, electric vehicles, ships, electric toys and electric tools, etc. Among them, electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, etc., such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0049] For the convenience of description, the following embodiments are described by taking a vehicle 200 as an example of an electrical device provided in some embodiments of the present application.

[0050] refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 200 provided for some embodiments of the present application. The vehicle 200 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 200, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 200. The battery device 100 may be used to power the vehicle 200, for example, the battery device 100 may be used as an operating power source for the vehicle 200. The vehicle 200 may also include an axle 201, a wheel 202 connected to the axle 201, and a motor 203 and a controller 204, wherein the motor 203 is used to drive the axle 201 to rotate, the controller 204 is used to control the operation of the motor 203, and the battery device 100 may be used to provide electrical energy for the operation of the motor 203 and other components in the vehicle.

[0051] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 200 , but also serve as a driving power source for the vehicle 200 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 200 .

[0052] refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 1 and a battery cell 2, and the battery cell 2 is accommodated in the box body 1. The box body 1 includes a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define a storage space for accommodating the battery cell 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, and 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 jointly define a storage space; the first box body 11 and the second box body 12 can also 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 a variety of shapes, such as: cylinder or cuboid.

[0053] There may be multiple battery cells 2, and the multiple battery cells 2 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 2 are both connected in series and in parallel. The multiple battery cells 2 may be connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 2 is accommodated in the box 1. Of course, the battery device 100 may also be a battery module formed by connecting multiple battery cells 2 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 1. The battery device 100 may also include other components. For example, the battery device 100 may also include a current collector assembly (CCS) for realizing electrical connection between the multiple battery cells 2.

[0054] The battery cell 2 can be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 2 can be cylindrical, flat, rectangular or in other shapes.

[0055] refer to Figure 3 , Figure 3 A schematic diagram of the exploded structure of a battery cell 2 provided in some embodiments of the present application.

[0056] The battery cell 2 includes a shell 21, an end cap 22 and an electrode assembly 23. The shell 21 is determined according to the shape of one or more electrode assemblies 23 after being combined. For example, the shell 21 can be a hollow cuboid, a cube or a cylinder, and one of the surfaces of the shell 21 has an opening so that one or more electrode assemblies 23 can be placed in the shell 21. For example, when the shell 21 is a hollow cuboid or a cube, one of the planes of the shell 21 is an open surface, that is, the plane does not have a shell wall so that the shell 21 is connected to the inside and outside. When the shell 21 is a hollow cylinder, the circular side of the shell 21 is an open surface, that is, the circular side does not have a shell wall so that the shell 21 is connected to the inside and outside. The end cap 22 is connected to the shell 21 at the opening of the shell 21 to form a closed shell for placing the electrode assembly 23.

[0057] The end cap 22 is basically in the shape of a flat plate, and two poles 24 are provided on the end cap 22. The two poles 24 include a positive pole and a negative pole. An explosion-proof valve 25 may also be provided on the end cap 22. When too much gas is generated by the battery cell 2, the gas expands and the gas pressure in the shell increases to a value exceeding a preset value, the explosion-proof valve 25 may be cracked to connect the inside and outside of the shell, and the gas is released outward through the crack of the explosion-proof valve 25, thereby avoiding explosion.

[0058] refer to Figure 4 and Figure 5 In the process of arranging the battery cell 2 in the box body 1, the battery cell 2 can be firstly arranged in the first box body 11, and then the second box body 12 is buckled to connect the second box body 12 and the first box body 11. Since a plurality of battery cells 2 are arranged in the box body 1, the plurality of battery cells 2 arranged in sequence along the first direction X are regarded as a battery cell group 20, and a plurality of battery cell groups 20 can be arranged in the box body 1, and the plurality of battery cell groups 20 are arranged in sequence along the second direction Y.

[0059] The first direction X intersects with the second direction Y, and optionally, the first direction X is perpendicular to the second direction Y. The direction from the first box 11 to the second box 12 is a third direction Z. The third direction Z intersects with the first direction X and the second direction Y, respectively, and optionally, the third direction Z is perpendicular to the first direction X and the second direction Y, respectively.

[0060] In some related technologies, in order to achieve electrical connection between multiple battery cells 2, space is reserved between the multiple battery cells 2 and the first box body 11 along the third direction Z for setting CCS (Cell Connector System, battery cell connection system, or integrated busbar, wiring harness board integration, etc.). Since assembly gaps and margin space need to be reserved between the battery cells 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 larger, thereby reducing the energy density.

[0061] Based on this, some embodiments of the present application provide a method for preparing a battery device, an electrical device, and a battery case, which are used to alleviate the problem of low battery energy density.

[0062] 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 .

[0063] 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 .

[0064] The 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 .

[0065] In some embodiments, the battery cell group 20 includes at least two battery cells 2 arranged along the first direction X.

[0066] In the above embodiment, 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. The battery cell group 20 is arranged in the accommodating space formed by the first box body 11 and the second box body 12 being buckled together. The busbar assembly 30 is embedded in the wall of the first box body 11, and the busbar assembly 30 is electrically connected to the battery cell group 20 accordingly.

[0067] In the above embodiment, the busbar assembly 30 includes a busbar 3, which is also called a connecting piece, an aluminum bar, etc. The busbar assembly 30 is a component for electrically connecting multiple battery cells 2 in series and / or in parallel. After multiple battery cells 2 are connected in series and / or in parallel through the busbar assembly 30, they have a higher voltage, so the side with the busbar assembly 30 is sometimes called the high-voltage side.

[0068] In the above embodiment, the electrical connection between the multiple battery cells 2 can be achieved through the busbar assembly 30, so that the multiple battery cells 2 can be connected in series, in parallel, or in mixed connection. The busbar assembly 30 is embedded in the wall 113 of the first box body 11, and the busbar assembly 30 does not exceed the wall 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 will not be increased due to the provision 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.

[0069] In the above embodiment, the bus assembly 30 is used to achieve electrical connection with the battery cell group 20. The bus assembly 30 is made of conductive material. For example, the bus piece 3 in the bus assembly 30 is made of metal conductive material. The bus assembly 30 is embedded in the wall 113 of the first box body 11. Therefore, the overall stiffness of the first box body 11 can also be improved through the bus assembly 30, thereby increasing the load capacity of the first box body 11.

[0070] In some embodiments, the busbar 3 is made of aluminum.

[0071] In some embodiments, the first box 11 is located below the second box 12. Alternatively, the first box 11 is located above the second box 12. That is, the first box 11 can be the lower box of the battery device 100, and the wall 113 of the first box 11 is the bottom wall of the battery box 1, and also the bottom wall of the battery assembly. The first box 11 can also be the upper box of the battery device 100.

[0072] refer to Figures 6 to 10 In some embodiments, the battery cell group 20 includes a battery cell 2, the busbar assembly 30 includes 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 body 11 at a position corresponding to the pole 24, and the pole 24 passes through the opening 114 to contact and connect with the busbar 3.

[0073] In the above embodiment, the pole 24 passes through the opening 114 and contacts and connects with the busbar 3, so that the battery cell 2 and the busbar 3 can be electrically connected. The busbar 3 and the pole 24 are in contact and connected, and no other components need to be provided in the third direction Z, which 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.

[0074] In the above embodiment, each battery cell 2 includes two poles 24, namely a positive pole and a negative pole. There are multiple battery cells 2, and there are multiple busbars 3. Each busbar 3 is electrically connected to a pole 24 of a battery cell 2, so that the multiple battery cells 2 can be electrically connected in series, in parallel, or in mixed connection.

[0075] In some embodiments, the pole 24 passes through the opening 114 and is in direct contact with the busbar 3 .

[0076] In some embodiments, the busbar 3 is welded to the pole 24 .

[0077] In the above embodiment, the busbar 3 is welded to the pole 24, so that the battery cell 2 and the first box body 11 can be fixedly connected, the vibration consistency of the battery cell 2 and the first box body 11 is improved, the problem of collision between the battery cell 2 and the first box body 11 is reduced, and the integrity of the battery device 100 is improved.

[0078] refer to Figures 6 to 10 In some embodiments, the pole 24 is arranged 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, and the receiving 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.

[0079] In the above embodiment, the first side surface 26 of the battery cell 2 is bonded to the wall 113 of the first box body 11 by the first colloid 6, which strengthens the firmness of the connection between the battery cell 2 and the first box body 11, improves the vibration consistency of the battery cell 2 and the first box body 11, reduces the problem of collision between the battery cell 2 and the first box body 11, and improves the integrity of the battery device 100.

[0080] 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 24 . The pole 24 extends toward the first box body 11 and passes through the opening 114 to contact and connect with a busbar 3 .

[0081] 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.

[0082] refer to Fig. 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.

[0083] 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.

[0084] In some embodiments, the first colloid 6 is disposed around the circumference of the wiring harness assembly 4 .

[0085] 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.

[0086] 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.

[0087] In some embodiments, the wiring harness assembly 4 includes detection wires or signal wires, etc.

[0088] 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 .

[0089] In the above embodiment, the opening 114 and the process hole 111 are respectively located on both sides of the collector 3. The collector 3 is embedded in the wall 113 of the first box body 11, and the side of the collector 3 facing the inside of the box body 1 is provided with an opening 114, and the side of the collector 3 facing the outside of the box body 1 is provided with a process hole 111.

[0090] In the above embodiment, in order to realize the connection between the bus 3 and the pole 24, a process hole 111 is provided on the side of the wall 113 of the first box body 11 facing away from the outlet 114. The process hole 111 corresponds to the position of the bus 3 to allow related equipment to pass through, thereby realizing the connection between the bus 3 and the pole 24 and facilitating the connection operation between the bus 3 and the pole 24.

[0091] The connection process between the first box body 11 and the battery cell 2 is as follows: the first side surface 26 of the battery cell 2 provided with the pole 24 faces the first box body 11, and the pole 24 passes through the opening 114 provided on the wall 113 of the first box body 11, and is in contact with and connected to the embedded busbar 3; then, the related equipment is operated to pass through the process hole 111 to further connect the busbar 3 and the pole 24. Optionally, the related equipment includes an operating device, and the welding device is operated to pass through the process hole 111 to weld the busbar 3 and the pole 24.

[0092] refer to Figure 8 and Fig. 9 In some embodiments, the battery device 100 further includes an insulating member 13 , which is disposed on a side of the first box body 11 away from the battery cell 2 and covers the process hole 111 .

[0093] In the above embodiment, since the position of the process hole 111 corresponds to the busbar 3, in order to reduce the risk of leakage or electric shock, an insulating member 13 is provided on the side of the first box body 11 away from the battery cell 2. The process hole 111 is covered by the insulating member 13, thereby reducing the risk of leakage or electric shock of the battery device 100.

[0094] In some embodiments, since a plurality of busbars 3 are embedded in the wall 113 of the first box body 11 , a plurality of process holes 111 are correspondingly arranged on the first box body 11 . In order to cover the plurality of process holes 111 , an integral insulating member 13 may be arranged so that the insulating member 13 covers all the process holes 111 .

[0095] In some embodiments, the insulating member 13 is bonded to a side of the first box body 11 facing away from the battery cell 2 by means of colloid.

[0096] In some embodiments, the insulating member 13 includes an insulating film such as a PC insulating film, a thermoplastic PP continuous fiber tape, or the like.

[0097] In some embodiments, a detection hole 31 is provided on the current collector 3 .

[0098] In the above embodiment, the detection hole 31 is provided on the busbar 3 , and the detection hole 31 can be used to align the busbar 3 and the pole 24 , and can be used to detect the connection quality between the busbar 3 and the pole 24 .

[0099] refer to Figure 6 In some embodiments, the battery cell group 20 includes at least two battery cells 2 arranged along a first direction X, each battery cell 2 is provided with two poles 24, one pole 24 of each battery cell 2 is arranged along the first direction X to form a first pole row 24a, and the other pole 24 of each battery cell 2 is arranged along the first direction X to form a second pole row 24b; the first pole row 24a and the second pole row 24b are arranged along the second direction Y.

[0100] refer to Figure 4 The bus assembly 30 includes a first bus bar 301 and a second bus bar 302 arranged along the second direction Y, and the first bus bar 301 and the second bus bar 302 respectively include at least two bus members 3 arranged along the first direction X.

[0101] Each pole 24 in the first pole row 24 a is electrically connected to each bus bar 3 in the first bus bar 301 in a one-to-one correspondence.

[0102] Each pole 24 in the second pole row 24 b is electrically connected to each bus bar 3 in the second bus bar 302 in a one-to-one correspondence.

[0103] exist Figure 6 In the illustrated embodiment, two poles 24 are provided on each battery cell 2, namely, a first pole 241 and a second pole 242, wherein the first pole 241 is a positive pole and the second pole 242 is a negative pole. When the battery cells 2 are connected in series, the poles 24 in the first pole row 24a are alternately arranged with the first pole 241 and the second pole 242; the poles 24 in the second pole row 24b are alternately arranged with the second pole 242 and the first pole 241. Of course, the battery cells 2 can also be connected in parallel, and the poles 24 in the first pole row 24a are either the first pole 241 or the second pole 242; and the poles 24 in the second pole row 24b are either the second pole 242 or the first pole 241.

[0104] In the above embodiment, the battery cell group 20 includes at least two battery cells 2 arranged along the first direction X, each battery cell 2 is provided with two poles 24, and the bus assembly 30 includes a plurality of bus members 3, each pole 24 is electrically connected to a bus member 3, so as to realize the electrical connection between the battery cell group 20 and the bus assembly 30, so that the current between the battery cells 2 can flow smoothly, thereby realizing the storage and release of electric energy. A plurality of bus members 3 are embedded in the wall 113 of the first box 11, which can improve the rigidity of the first box 11. The bus member 3 is embedded in the wall 113 of the first box 11, and the size of the battery device 100 in the third direction Z will not be increased due to the need to reserve space between the first box 11 and the battery cell 2 to set the bus member 3, 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.

[0105] 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 bus assemblies 30 arranged along the second direction Y, and each battery cell group 20 is electrically connected to a bus assembly 30 .

[0106] In some embodiments, the wall 113 of the first box 11 is the bottom wall of the battery device.

[0107] In the above embodiment, the wall 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 wall 113 of the first box body 11 is embedded with the bus assembly 30. The bus assembly 30 can improve the rigidity of the first box body 11 and reduce the deformation of the first box body 11 after being loaded, so that the first box body 11 can provide better support for the battery cell 2 as the bottom wall.

[0108] In some embodiments, the first box body 11 and the busbar assembly 30 are integrally formed by injection molding.

[0109] In the above embodiment, the first box 11 is formed by injection molding, which can reduce the weight of the first box 11; the first box 11 and the bus assembly 30 are formed into an integral structure by injection molding, which can embed the bus assembly 30 into the wall 113 of the first box 11, reduce the processing procedures and processing costs, improve the connection strength between the bus assembly 30 and the first box 11, and reduce the quality problems such as the bus assembly 30 falling off from the first box 11 during transportation; furthermore, compared with the box with a single injection molding structure, the bus assembly 30 is embedded in the wall 113 of the first box 11, which can improve the rigidity of the first box 11 through the bus assembly 30, reduce the deformation of the first box 11 after being loaded, and enable the first box 11 to provide better support for the battery cell group 20. In addition, the first box 11 and the bus assembly 30 are formed into an integral structure by injection molding, which can improve the frequency synchronization between the first box 11 and the bus assembly 30, reduce mutual vibration, and improve the integrity of the battery device 100. Furthermore, the bus assembly 30 is embedded in the wall 113 of the first box body 11 by injection molding, and the size of the battery device 100 in the third direction Z will not be increased due to the need to reserve space between the first box body 11 and the battery cell group 20 to set the bus assembly 30. The overall size of the battery device 100 in the third direction Z is reduced, and the energy density of the battery device 100 is improved.

[0110] In the above embodiment, the injection molding material used to prepare the first box body 11 by the injection molding process includes a thermoplastic material or a thermosetting material.

[0111] In some embodiments, the first box body 11 and the busbar assembly 30 are integrally formed by molding.

[0112] In the above embodiment, the first box 11 is formed by molding, which can reduce the weight of the first box 11; the first box 11 and the busbar assembly 30 are formed into an integral structure by molding, which can embed the busbar assembly 30 into the wall 113 of the first box 11, reduce the processing procedures and processing costs, improve the connection strength between the busbar 3 and the first box 11, and reduce the quality problems such as the busbar assembly 30 falling off from the first box 11 during transportation; furthermore, compared with the box with a single molded structure, the busbar assembly 30 is embedded in the wall 113 of the first box 11, which can improve the rigidity of the first box 11 through the busbar assembly 30, reduce the deformation of the first box 11 after being loaded, and enable the first box 11 to provide better support for the battery cell group 20. In addition, the first box 11 and the busbar assembly 30 are formed into an integral structure by molding, which can improve the frequency synchronization between the first box 11 and the busbar assembly 30, reduce mutual vibration, and improve the integrity of the battery device 100. Furthermore, the bus assembly 30 is embedded in the wall 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 be increased due to the need to reserve space between the first box body 11 and the battery cell group 20 to set the bus assembly 30. The overall size of the battery device 100 in the third direction Z is reduced, and the energy density of the battery device 100 is improved.

[0113] In the above-mentioned embodiment, the molding material used for the first housing 11 includes a thermosetting material.

[0114] 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 process of forming the first box body 11 by injection molding or compression molding.

[0115] refer to Fig.10 and Fig.12 In some embodiments, the bus assembly 30 includes a bus piece 3, a groove 112 is provided on the wall 113 of the first box body 11, and the bus piece 3 is provided in the groove 112. The battery cell group 20 includes a battery cell 2, and the battery cell 2 is provided with a pole 24, and the pole 24 is connected to the bus piece 3.

[0116] In the above embodiment, a groove 112 is provided in the wall 113 of the first box body 11, and the busbar 3 is provided in the groove 112. The busbar 3 does not exceed the groove 112, and an opening 114 exposing the busbar 3 is naturally formed on the wall 113 of the first box body 11. Therefore, after the busbar 3 is provided, the size of the first box body 11 in the third direction Z will not change, and the size of the battery device 100 in the third direction Z will not be increased due to the need to reserve space between the first box body 11 and the battery cell 2 to provide the busbar 3, 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.

[0117] In some embodiments, the busbar 3 and the groove 112 are connected via a second colloid.

[0118] In the above embodiment, the busbar 3 and the groove 112 are connected via the second colloid, which has a simple process and convenient operation.

[0119] In some embodiments, the side of the battery cell group 20 facing away from the first box body 11 is connected to the second box body 12 via a third colloid.

[0120] In the above embodiment, the second box 12 and the battery cell group 20 are connected by the third colloid, which increases the bonding depth between the battery cell group 20 and the second box 12, greatly improves the integrity of the battery device 100, reduces the collision between the battery cell group 20 and the second box 12, and improves the safety of the battery device 100.

[0121] In some embodiments, the second side 27 of the battery cell 2 is connected to the second box 12 through a third colloid, and the second side 27 is a side opposite to the first side 26, which can greatly increase the depth of integration between the battery cell group 20 and the second box 12; the first side 26 of the battery cell 2 is bonded to the first box 11 through the colloid, and the pole 24 of the battery cell 2 is welded to the busbar 3 embedded in the wall 113 of the first box 11, which can greatly increase the depth of integration between the battery cell group 20 and the first box 11; therefore, the collision between the battery cell group 20 and the first box 11 and the second box 12 can be greatly reduced, thereby improving the integrity and safety of the battery device 100.

[0122] In some embodiments, the battery device 100 further includes a cooling component, and the cold zone component is used to cool the battery cell group 20 to reduce the risk of thermal runaway.

[0123] In some embodiments, a cooling assembly may be disposed between the second box 12 and the battery cell group 20 .

[0124] In some embodiments, the cooling assembly may also be disposed on the side surfaces of the battery cell group 20 other than the first side surface 26 and the second side surface 27 , and the cooling assembly may be disposed on the side surface with a larger area to improve the cooling effect.

[0125] Some embodiments of the present application further provide an electrical device, which includes the battery device 100 described above.

[0126] The electric device provided in the embodiment of the present application includes the battery device 100 provided in the embodiment of the present application, and correspondingly has the beneficial effects of the battery device 100.

[0127] Some embodiments of the present application also provide a method for preparing a battery case, the battery case comprising the first case 11 in the above embodiment, the preparation method comprising the following steps: The busbar 3 is placed in a mold for preparing the first box body 11 , and materials are injected into the mold, so that the first box body 11 with the busbar 3 embedded therein is integrally formed through an injection molding process.

[0128] In the above embodiment, the first box body 11 is formed by injection molding, which can reduce the weight of the first box body 11; the first box body 11 and at least two busbars 3 are formed into an integral structure by injection molding, which can embed the busbar 3 into the wall 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 the quality problems such as the busbar 3 falling off from the first box body 11 after the transportation process; furthermore, compared with the box body with a single injection molding structure, the busbar 3 is embedded in the wall 113 of the first box body 11, which can improve the rigidity of the first box body 11 through the busbar 3, reduce the deformation 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. In addition, the first box body 11 and at least two busbars 3 are formed into an integral structure by injection molding, which can improve the frequency synchronization between the first box body 11 and the busbar 3, reduce vibration, and improve the integrity of the battery device 100. Furthermore, the busbar 3 is embedded in the wall 113 of the first box body 11 by injection molding, and the size of the battery device 100 in the third direction Z will not be increased due to the need to reserve space between the first box body 11 and the battery cell group 20 to set the busbar 3. The overall size of the battery device 100 in the third direction Z is reduced, and the energy density of the battery device 100 is improved.

[0129] In the above embodiment, the injection molding material used to prepare the first box body 11 by the injection molding process includes a thermoplastic material or a thermosetting material.

[0130] The first box body 11 is injection-molded by thermoplastic material or thermosetting material, which can reduce weight compared with a box body made of metal material.

[0131] Some embodiments of the present application also provide a method for preparing a battery case, the battery case comprising the first case 11 in the above embodiment, the preparation method comprising the following steps: The busbar 3 is placed in a mold for preparing the first box body 11, and material is first injected on one side of the busbar 3 in the thickness direction (third direction Z), and then material is injected on the other side of the busbar 3 in the thickness direction (third direction Z), and the first box body 11 with the busbar 3 embedded therein is integrally formed through a secondary injection molding process.

[0132] In the above embodiment, the busbar 3 and the first box body 11 are formed into an integral structure through a secondary injection molding process, which can reduce quality problems such as the existence of gaps around the busbar 3 and the busbar 3 being easy to fall off due to the excessive volume of the first box body 11 and insufficient injection of material around the busbar 3, that is, insufficient injection of material in one time.

[0133] Some embodiments of the present application also provide a method for preparing a battery case, the battery case comprising the first case 11 in the above embodiment, the preparation method comprising the following steps: Two layers of fiber cloth are placed in a mold for preparing the first box body 11, and the busbar 3 is fixed between the two layers of fiber cloth, wherein windows are reserved on the two layers of fiber cloth to expose the connection surface of the busbar 3 (the connection surface connected to the pole 24); The molds are closed and material is injected into the mold cavity, and the first box body 11 with the current collector 3 embedded therein is integrally formed through a molding process.

[0134] In the above embodiment, two layers of fiber cloth are used to fix the busbar 3, and windows are reserved on the two layers of fiber cloth to expose the connection surface of the busbar 3. The injected material avoids the window area, so that after the first box body 11 and the busbar 3 are molded, the connection surface between the busbar 3 and the pole 24 is exposed, which will not affect the welding of the busbar 3 and the pole 24.

[0135] In the above embodiment, 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 collectors 3 are formed into an integral structure by molding, which can embed the collector 3 into the wall 113 of the first box body 11, reduce the processing procedures and processing costs, improve the connection strength between the collector 3 and the first box body 11, and reduce the quality problems such as the collector 3 falling off from the first box body 11 after the transportation process; furthermore, compared with the box body with a single molded structure, the collector 3 is embedded in the wall 113 of the first box body 11, which can improve the rigidity of the first box body 11 through the collector 3, reduce the deformation 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. In addition, the first box body 11 and at least two collectors 3 are formed into an integral structure by molding, which can improve the frequency synchronization between the first box body 11 and the collector 3, reduce vibration, and improve the integrity of the battery device 100. Furthermore, the busbar 3 is embedded in the wall 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 be increased due to the need to reserve space between the first box body 11 and the battery cell 2 to set the busbar 3. 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.

[0136] In the above embodiment, the molding material used to prepare the first housing 11 includes a thermosetting material. The first housing 11 is molded with a thermosetting material, which can reduce weight compared to a housing made of a metal material.

[0137] Some specific embodiments of integrally forming the first box body 11 and the current collector 3 are listed below.

[0138] In the first embodiment, the busbar 3 is manufactured in advance and placed in a mold by an injection molding process, and a material is injected into the mold so that the first box body 11 and the busbar 3 are formed into an integral structure by the injection molding process. Alternatively, by a secondary injection molding process, materials are injected into the front and back sides of the busbar 3 in succession so that the first box body 11 and the busbar 3 are formed into an integral structure by a secondary injection molding process.

[0139] The first box body 11 and the current collector 3 are formed into an integrated structure by an injection molding process, which includes the following steps: In the injection mold, put the manifold 3 and nuts, etc.; Closing the mold and injecting molten plastic into the mold cavity; Cooling and shaping; The mold is opened and ejected, and the injection molding of the first box body 11 with the manifold 3 or the inserts such as nuts can be completed.

[0140] The nut embedded in the first box body 11 can be used to connect with the second box body 12 .

[0141] In the above embodiment, after the first box body 11 and the busbar 3 are integrally formed by injection molding, the busbar 3 except for the necessary connection surface can be buried in the plastic layer of the first box body 11 formed by injection molding.

[0142] Specifically, after the first box body 11 and the current collector 3 are integrally formed by the injection molding process, two side surfaces of the current collector 3 in the thickness direction are partially exposed to be connected to the poles 24 of the battery cells 2 .

[0143] The connection process between the first box body 11 and the battery cell 2 includes the following steps: The pole 24 of the battery cell 2 faces upwards. After the battery cells 2 are arranged in sequence, the first box body 11 formed by injection molding is inverted, so that the busbar 3 embedded in the first box body 11 is aligned with the pole 24 of the battery cell 2, so that the pole 24 is connected to the position of the busbar 3 exposed outside the wall 113, and the position of the pole 24 is captured through the process hole 111 on the first box body 11 and the detection hole 31 set on the busbar 3, and the busbar 3 and the pole 24 are welded. After welding, an insulating member 13 is set on the side of the first box body 11 away from the battery cell 2, and the insulating member 13 covers the process hole 111. Optionally, the insulating member 13 and the first box body 11 are bonded by structural adhesive. At this point, 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 11 is glued to the first side 26 of the battery cell 2 using structural adhesive; the second box 12 can also be glued to the second side 27 of the battery cell 2 to increase the integrity of the battery device 100 .

[0144] The injection molding material for preparing the first box body 11 includes thermoplastic materials or thermosetting materials such as PP (Polypropylene), PA6 nylon plastic, PC (Polycarbonate), ABS (Acrylonitrile Butadiene Styrene), and PBT (Polybutylene Terephthalate), and strength additives such as fibers of different components and talcum powder can be added according to the structural strength.

[0145] The insulating member 13 includes insulating films such as PC insulating film and thermoplastic PP continuous fiber tape.

[0146] In the first embodiment, the busbar 3 is hung in the mold in advance using a robot and a tool, and the busbar 3 and the first box body 11 are integrally formed, which has the following beneficial effects.

[0147] 1. The secondary assembly process of the production line is eliminated, which improves the process convenience of this component. The first box body 11 is integrally injection molded, and the position consistency of each collector 3 in the wall body 113 of the first box body 11 is higher, and there is no risk of falling off during transportation or assembly. The injection molded first box body 11 has the advantage of insulation, and the first box body 11 with the collector 3 embedded can replace the two components of CCS and the first box body 11, reducing the number of materials, processes and costs.

[0148] 2. Since the CCS and the first box 11 are combined, the height of the battery device 100 in the third direction Z can be reduced. In some experiments, the height of the battery in the third direction Z is reduced by 5 mm to 15 mm.

[0149] 3. Since the first box 11 also needs to meet the function of thermal runaway resistance of the battery, it itself needs to have certain ablation resistance and strength performance. Therefore, structural adhesive is used to bond the first box 11 and the first side surface 26 of the battery cell 2, and the pole 24 of the battery cell 2 is welded to the busbar 3 of the first box 11. Through the form of metal welding + structural adhesive bonding, the battery cell 2 and the first box 11 are deeply bonded, which can greatly improve the main frequency of the battery and ensure that the relevant requirements are met during the vibration process.

[0150] 4. Based on the problem of insufficient rigidity of the injection-molded box, adding an insert (manifold 3) inside the first box 11 can greatly improve the overall rigidity of the first box 11 and increase the load capacity of the first box 11. At the same time, through the auxiliary effect of the support member 14 of the first box 11, the ability of the first box 11 to withstand the pressure from the battery cell 2 can be improved.

[0151] In the second embodiment, the busbar 3 is wrapped with multiple layers of fiber cloth, and resin is injected into the mold, and the busbar 3 and the first box body 11 are formed into an integrated structure by a molding process. The fiber cloth is partially cut on the welding surface of the busbar 3, and the welding surface of the busbar 3 after molding is partially exposed to support subsequent welding with the pole 24 of the battery cell 2.

[0152] The process of forming the current collector 3 and the first box body 11 into an integrated structure through a molding process includes the following steps: Put the bottom fiber cloth (with a window cut out to expose the busbar 3) into the molding die; Place the busbar 3 insert, and then place the top layer of fiber cloth (with a window cut out to expose the busbar 3); The mold is closed, and resin is injected into the mold cavity to make the resin soak the fiber cloth and the manifold 3, and the resin is isolated at the window opening position; Cooling and shaping; By opening the mold, the production of the first box body 11 with the insert of the busbar 3 can be completed.

[0153] In the second embodiment, the current collector 3 and the first box body 11 are formed into an integrated structure through a molding process, which has the following beneficial effects.

[0154] The composite first box body 11 formed by the molding process is stronger than the injection molding material because of the tensile and bending modulus of the fiber cloth and the resin. On the basis of welding the current collector 3 embedded in the first box body 11 to the pole 24 of the battery cell 2 by the welding process, the first box body 11 can be additionally bonded to the first side 26 of the battery cell 2 by using a structural adhesive, and the second box body 12 can be bonded to the second side 27 of the battery cell 2 by using a structural adhesive, so as to increase the main frequency of the battery, so that the box body 1 can carry a larger capacity of the battery cell 2, and improve the single pack power of the battery.

[0155] In the third embodiment, a hollow non-metal first box 11 is first manufactured by using a molding or injection molding process, and the busbar 3 is placed in the hollow portion (groove 112) of the first box 11. Finally, a structural adhesive is used to fill the space between the non-metal first box 11 and the battery cell 2, and the busbar 3 and the pole 24 are welded.

[0156] The injection molding or compression molding mold does not need to provide a fixing structure for fixing the busbar 3 , and the hollow first box body 11 is glued to the busbar 3 after molding, and the overall process is simple.

[0157] Based on the above-mentioned embodiments, the technical solution provided in the embodiment of the present application that the first box body 11 and the busbar 3 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, and 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 improve the main frequency of the battery. 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 easy to fall off from the first box body 11. In addition, there is no need to reserve space for installing the CCS between the first box body 11 and the battery cell 2, so the height of the battery in the third direction Z can be reduced, and the energy density of the battery can be improved.

[0158] Based on the above-mentioned embodiments of the present application, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0159] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. 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

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: The battery device also includes 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.

14. A method for preparing a battery box, characterized in that: The battery box comprises a first box (11) according to any one of claims 1 to 12, and the preparation method comprises the following steps: The current collector (3) is placed in a mold for preparing a first box body (11), material is injected into the mold, and the first box body (11) with the current collector (3) embedded therein is integrally formed by an injection molding process.

15. A method for preparing a battery box, characterized in that: The battery box comprises a first box (11) according to any one of claims 1 to 12, and the preparation method comprises the following steps: The busbar (3) is placed in a mold for preparing a first box body (11), material is first injected into one side of the busbar (3) in the thickness direction, and then material is injected into the other side of the busbar (3) in the thickness direction, and the first box body (11) with the busbar (3) embedded therein is integrally formed through a secondary injection molding process.

16. A method for preparing a battery box, characterized in that: The battery box comprises a first box (11) according to any one of claims 1 to 12, and the preparation method comprises the following steps: Two layers of fiber cloth are placed in a mold for preparing a first box body (11), and a current collector (3) is fixed between the two layers of fiber cloth, wherein windows are reserved on the two layers of fiber cloth to expose the connection surface of the current collector (3); The molds are closed and material is injected into the mold cavity, and a first box body (11) with a current collector (3) embedded therein is integrally formed through a molding process.

Images