Battery device and electric device

Abstract

The application provides a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a battery monomer assembly, a battery management system, a battery sampling unit and a limiting piece. The battery monomer assembly comprises a busbar component and a battery monomer, and the busbar component is located on one side of the battery monomer in a first direction and connected with the battery monomer. The battery sampling unit comprises a circuit board and a battery monitoring assembly, the circuit board is arranged on one side of the battery monomer facing the busbar component and connected with a sampling point, and the battery monitoring assembly comprises a plurality of components arranged on the circuit board, and the plurality of components comprise an analog front end connected with the battery management system. The limiting piece comprises a first limiting part located on one side of the circuit board away from the battery monomer. In the first direction, the circuit board has a first area overlapping with the first limiting part, and at least one component is arranged in the first area, so as to reduce the vibration phenomenon of the circuit board and reduce the risk of damage of the components on the circuit board.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery device and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of stability and reliability in use.

[0003] In battery technology, to ensure the safety of individual battery cells, battery devices typically include a Battery Management System (BMS), a Cells Contact System (CCS), and a Cell Supervision Circuit (CSC). The Cells Contact System collects the voltage and temperature of individual battery cells during use. It communicates with the Battery Management System via the Cell Supervision Circuit to transmit the collected temperature and voltage signals to the Management System for processing and management, thus providing information on the individual battery cell's usage. However, existing battery devices often occupy significant space due to the large size of the BMS, Cells Contact System, and Cell Supervision Circuit, resulting in low space utilization and hindering improvements in energy density. Furthermore, the long transmission path between the Cells Contact System and Cell Supervision Circuit can affect the accuracy of the collected temperature and voltage data, making it difficult to effectively assess the individual battery cell's usage and negatively impacting the stability and reliability of the battery device. Utility Model Content

[0004] This application provides a battery device and an electrical device that can effectively improve the energy density and reliability of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, including a battery cell assembly, a battery management system, a battery sampling unit, and a limiting component; the battery cell assembly includes a busbar and multiple battery cells, the busbar is located on one side of the battery cells in a first direction, the busbar is electrically connected to at least two of the battery cells, and at least one busbar and / or at least one battery cell is provided with a sampling point; the battery sampling unit includes a circuit board and a battery monitoring component, the circuit board is disposed on one side of the multiple battery cells in the first direction, and the circuit board is connected to the sampling point to collect temperature signals and / or voltage signals of the battery cells, and the battery monitoring component... The component includes multiple components disposed on and electrically connected to the circuit board, the multiple components including at least one analog front end, the analog front end being communicatively connected to the battery management system, the analog front end being configured to convert the temperature signal and / or the voltage signal collected by the circuit board into a digital signal and transmit it to the battery management system; the limiting member is fixed to the battery cell assembly, the limiting member including a first limiting portion located on the side of the circuit board opposite to the battery cell in the first direction; wherein, along the first direction, the circuit board has a first region overlapping with the first limiting portion, and at least a portion of at least one of the components is disposed in the first region.

[0006] In the above technical solution, the battery device includes a battery management system and a battery sampling unit. The battery sampling unit can collect the voltage and / or temperature of individual battery cells during use. The battery monitoring component of the battery sampling unit is communicatively connected to the battery management system to transmit the temperature and / or voltage signals collected by the battery sampling unit to the battery management system for processing and management, thereby improving the reliability of the battery device. The battery monitoring component includes multiple components mounted on and electrically connected to a circuit board. The battery monitoring component, used for signal conversion and transmission between the battery sampling unit and the battery management system, is integrated onto the circuit board of the battery sampling unit. A limiting member is fixedly provided on the individual battery cell assembly. The limiting member includes a first limiting portion located on the side of the circuit board away from the individual battery cell in a first direction. At least a portion of at least one component of the battery monitoring component is located in a first region where the circuit board and the first limiting portion overlap in the first direction. This allows the circuit board to integrate the first limiting portion of the battery monitoring component. One area is the region where the first limiting part of the limiting component presses down and limits. This battery device structure optimizes the layout and space of the circuit board and battery monitoring components, saving overall space and improving space utilization. This is beneficial for increasing the energy density of the battery device and shortening the transmission path between the circuit board and battery monitoring components. This improves the accuracy of the temperature and / or voltage signals of the battery cells obtained by the battery sampling unit and battery management system, thus enhancing the stability and reliability of the battery device. Furthermore, by covering the first area of ​​the circuit board where the battery monitoring components are integrated with the limiting component, the limiting component can limit and press down on this area, mitigating vibration or shaking during use. This reduces the risk of damage to components integrated on the circuit board, improving the lifespan and stability of the battery device.

[0007] In some embodiments, the limiting member further includes a second limiting portion; the second limiting portion is connected to the first limiting portion and fixed to the battery cell assembly; wherein, in a projection plane perpendicular to the first direction, the orthographic projection of the second limiting portion and the orthographic projection of the circuit board are completely misaligned.

[0008] In the above technical solution, the second limiting part is the part of the limiting member that is fixed to the battery cell assembly, so that the first limiting part is a structure fixed to the battery cell assembly by the second limiting part. By setting the orthographic projection of the second limiting part in the projection plane perpendicular to the first direction and the orthographic projection of the circuit board in the projection plane perpendicular to the first direction to be completely misaligned, the orthographic projection of the second limiting part in the projection plane perpendicular to the first direction and the orthographic projection of the circuit board in the projection plane perpendicular to the first direction are structures with non-overlapping areas. The battery device with this structure can reduce the interference between the second limiting part and the circuit board, thereby reducing the risk of the second limiting part pressing down on or damaging the circuit board. On the other hand, it facilitates the first limiting part to limit and press down on the first area of ​​the circuit board where the battery monitoring component is integrated, which is beneficial to improving the stability and reliability of the limiting member in limiting the first area of ​​the circuit board where the battery monitoring component is integrated.

[0009] In some embodiments, the battery cell includes a housing having a wall facing the circuit board in the first direction; wherein the limiting member is bent to form a bend, each second limiting portion is connected to the first limiting portion through one of the bends, and along the first direction, the second limiting portion is closer to the wall than the first limiting portion.

[0010] In the above technical solution, by bending the limiting member to form a bent portion, the bent portion is connected between the first limiting portion and the second limiting portion, and the second limiting portion is closer to the wall in the first direction than the first limiting portion. This makes the first limiting portion and the bent portion of the limiting member protrude from the surface of the second limiting portion away from the wall. The limiting member with this structure can form a receiving space on the side of the limiting member facing the wall and corresponding to the area of ​​the first limiting portion, so as to accommodate the circuit board located on the side of the first limiting portion facing the outer shell. This allows the circuit board and the limiting member to share space in the first direction, which is beneficial to improving the space utilization of the battery device and also provides a certain degree of protection for the first area of ​​the circuit board. On the other hand, it is easy to fix the second limiting portion to the battery cell assembly, which helps to reduce the assembly difficulty between the limiting member and the battery cell assembly.

[0011] In some embodiments, the limiting member includes a plurality of second limiting portions; the plurality of second limiting portions are all connected to the first limiting portion, and each second limiting portion is fixed to the battery cell assembly.

[0012] In the above technical solution, by connecting multiple second limiting parts to the first limiting part, and each second limiting part being fixed on the battery cell assembly, the stability and reliability of the limiting component being assembled on the battery cell assembly can be further improved, which is conducive to further improving the stability and reliability of the limiting component in limiting the first area of ​​the circuit board where the battery monitoring component is integrated.

[0013] In some embodiments, the battery cell assembly includes at least one row of battery cells, each row of battery cells including a plurality of battery cells stacked along a second direction, the circuit board extending along the second direction, and the circuit board having the busbar on both sides in a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other; wherein, along the third direction, both ends of the first limiting portion are connected to the second limiting portion.

[0014] In the above technical solution, by connecting the first limiting part to both sides along the third direction, the first limiting part can be fixed to the battery cell assembly at both ends along the third direction by the second limiting part. This can further improve the effect of the busbar component in limiting the movement of the limiting member away from the battery cell in the first direction, thereby further improving the stability and reliability of the limiting member assembled on the battery cell assembly. This is conducive to further improving the stability and reliability of the limiting member in limiting the first area of ​​the circuit board where the battery monitoring component is integrated.

[0015] In some embodiments, the second limiting portion is fixed to the busbar component.

[0016] In the above technical solution, the second limiting part of the limiting member is set as a structure fixed on the busbar component to fix the limiting member to the battery cell assembly.

[0017] In some embodiments, along the first direction, at least a portion of the second limiting portion is located on the side of the busbar component facing the battery cell.

[0018] In the above technical solution, by setting at least a portion of the second limiting part to a structure located on the side of the busbar component facing the battery cell in the first direction, the busbar component can also play a certain limiting role on the limiting member, so as to restrict the second limiting part from moving away from the battery cell in the first direction. This can further improve the stability and reliability of the second limiting part fixed on the busbar component, so that the first limiting part of the limiting member can play a limiting and pressing role on the first area of ​​the circuit board where the battery monitoring component is integrated, which is conducive to improving the stability and reliability of the limiting member in limiting the first area of ​​the circuit board where the battery monitoring component is integrated.

[0019] In some embodiments, the battery cell includes a housing, an electrode assembly, and electrode terminals. The housing has a wall facing the circuit board in the first direction. The electrode assembly is housed within the housing. The electrode terminals are disposed on the wall and protrude from the surface of the wall facing the circuit board, and the electrode terminals are electrically connected to the electrode assembly. Along the first direction, the busbar is connected to the electrode terminals, and at least a portion of the second limiting portion is located between the busbar and the wall.

[0020] In the above technical solution, the electrode terminals of the battery cell are disposed on the wall of the housing facing the circuit board and protrude from the surface of the wall facing the circuit board. The busbar is connected to the electrode terminals. By setting at least a portion of the second limiting part between the busbar and the wall in the first direction, the busbar and the wall can cooperate to restrict or clamp the second limiting part, thereby further improving the stability and reliability of the limiting member fixed on the battery cell assembly, and further improving the stability and reliability of the limiting member in limiting the first area of ​​the circuit board where the battery monitoring component is integrated.

[0021] In some embodiments, the busbar component is provided with a first positioning hole, and the second limiting portion is provided with a second positioning hole; wherein, along the first direction, the second positioning hole on the second limiting portion is disposed opposite to the first positioning hole on the corresponding busbar component.

[0022] In the above technical solution, by setting the first positioning hole on the busbar component and the second positioning hole on the second limiting part to be arranged opposite to each other in the first direction, the limiting part and the busbar component can be positioned relative to each other through the first positioning hole on the busbar component and the second positioning hole on the second limiting part during the assembly process of the battery device. This helps to improve the assembly accuracy between the limiting part and the busbar component, thereby improving the assembly quality of the battery device.

[0023] In some embodiments, the battery device further includes a first adhesive member; the first adhesive member adheres to the second limiting portion and the busbar component.

[0024] In the above technical solution, the second limiting part and the busbar component are bonded together by the first adhesive to fix the second limiting part to the busbar component, which helps to reduce the assembly difficulty between the second limiting part and the busbar component.

[0025] In some embodiments, the second limiting portion is fixed to the battery cell.

[0026] In the above technical solution, the second limiting part of the limiting member is set as a structure fixed on the battery cell, so as to fix the limiting member to the battery cell assembly.

[0027] In some embodiments, the battery device further includes a second adhesive member; the second adhesive member adheres to the second limiting portion and the battery cell.

[0028] In the above technical solution, the second limiting part and the battery cell are bonded together by the second adhesive to fix the second limiting part to the battery cell, which helps to reduce the assembly difficulty between the second limiting part and the battery cell.

[0029] In some embodiments, the battery cell assembly further includes an insulating member, at least a portion of which is disposed between the battery sampling unit and the battery cell in the first direction; wherein the second limiting portion is fixed to the insulating member.

[0030] In the above technical solution, the limiting member is fixed to the battery cell assembly by setting the second limiting part of the limiting member as a structure fixed on the insulating member.

[0031] In some embodiments, the battery device further includes a connector; the connector rivets the second limiting portion and the insulating member.

[0032] In the above technical solution, the second limiting part and the insulating part are riveted together by a connector to fix the second limiting part on the insulating part, which helps to improve the connection stability and firmness between the second limiting part and the insulating part.

[0033] In some embodiments, the battery cell includes a housing having a wall facing the circuit board in the first direction; wherein the battery cell further includes a pressure relief component disposed on the wall, and the first limiting portion has a first clearance hole in the area corresponding to the pressure relief component in the first direction, the first clearance hole penetrating the first limiting portion along the first direction.

[0034] In the above technical solution, by providing a first clearance hole in the area of ​​the pressure relief component of the battery cell in the first direction of the first limiting part of the limiting member, and the first clearance hole penetrating the first limiting part in the first direction, the obstruction of the first limiting part to the pressure relief component can be reduced when the battery cell undergoes thermal runaway and is depressurized through the pressure relief component. This is beneficial to improving the pressure relief effect of the battery cell and reducing the risk of the battery cell further causing an explosion.

[0035] In some embodiments, the limiting member is made of an insulating material.

[0036] In the above technical solution, by setting the limiting component as an insulating material, the risk of short circuit between the limiting component and the circuit board, as well as between the limiting component and the battery cell assembly, is reduced, which helps to improve the reliability of the battery device.

[0037] In some embodiments, the battery device further includes a buffer; at least a portion of the buffer is disposed between the first limiting portion and the circuit board in the first direction.

[0038] In the above technical solution, along the first direction, a buffer is provided between the first limiting part and the circuit board, so that the buffer can play a certain buffering role between the first limiting part and the circuit board, thereby reducing the rigid contact and collision between the first limiting part and the circuit board. In this way, while the first limiting part of the limiting part limits the circuit board, it can also reduce the bumps and collisions between the circuit board and the first limiting part, so as to further reduce the risk of damage to the components integrated on the circuit board of the battery monitoring component, which is conducive to improving the service life and stability of the battery device.

[0039] In some embodiments, along the first direction, a plurality of the components are disposed on the side of the circuit board facing the battery cell.

[0040] In the above technical solution, by setting the components of the battery monitoring component integrated on the circuit board to be located on the side of the circuit board facing the battery cell in the first direction, the components of the battery monitoring component integrated on the circuit board are positioned between the circuit board and the battery cell in the first direction. This provides a certain degree of protection for the components of the battery monitoring component integrated on the circuit board, reducing the impact or wear of the components during use. On the other hand, it facilitates the sharing of some space between the components of the battery monitoring component integrated on the circuit board and the battery cell assembly in the first direction, which is beneficial to optimizing the spatial layout of the battery device and improving the space utilization rate of the battery device.

[0041] In some embodiments, the surface of the circuit board is provided with a waterproof protective layer, and the waterproof protective layer covers a plurality of the components.

[0042] In the above technical solution, by setting a waterproof protective layer on the surface of the circuit board, and the waterproof protective layer having a structure that covers multiple components, the components of the battery monitoring component integrated on the circuit board are located between the circuit board and the waterproof protective layer. Thus, the waterproof protective layer can provide a certain degree of protection and waterproofing for the components of the battery monitoring component integrated on the circuit board, thereby effectively reducing the risk of bumps or wear during use, and effectively reducing the phenomenon of moisture damage or short circuits of the components of the battery monitoring component integrated on the circuit board, so as to further improve the stability and reliability of the battery device.

[0043] In some embodiments, the battery device further includes a reinforcing plate; the reinforcing plate is connected to the circuit board, and the reinforcing plate and the component are respectively disposed on both sides of the circuit board in the first direction; wherein, in a projection plane perpendicular to the first direction, at least a portion of the orthographic projection of at least one of the components is located within the orthographic projection of the reinforcing plate.

[0044] In the above technical solution, by connecting a reinforcing plate to the circuit board, with the reinforcing plate and components respectively disposed on both sides of the circuit board in the first direction, on the one hand, the reinforcing plate can strengthen the structural strength of the circuit board when multiple components of the battery monitoring component are integrated on the circuit board, so as to provide a certain support for the components of the battery monitoring component integrated on the circuit board, which is conducive to improving the assembly quality and assembly effect of the components of the battery monitoring component integrated on the circuit board. On the other hand, the reinforcing plate can strengthen the structural strength of the area of ​​the circuit board where multiple components of the battery monitoring component are integrated, so as to further improve the rigidity of the area of ​​the circuit board where the battery monitoring component is integrated, thereby mitigating the phenomenon of vibration or shaking in the first area of ​​the circuit board where the battery monitoring component is integrated during use, and reducing the risk of damage to the components of the battery monitoring component integrated on the circuit board.

[0045] In some embodiments, the thickness of the reinforcing plate along the first direction is 0.2 mm to 1 mm.

[0046] In the above technical solution, on the one hand, the thickness of the reinforcing plate in the first direction is set to be greater than or equal to 0.2 mm to improve the structural strength of the reinforcing plate, thereby improving the effect of the reinforcing plate in strengthening the structural strength of the area where the circuit board integrates multiple components of the battery monitoring component. On the other hand, the thickness of the reinforcing plate in the first direction is set to be less than or equal to 1 mm to reduce the phenomenon of excessive waste of the reinforcing plate and save the space occupied by the reinforcing plate in the first direction, which is conducive to improving the energy density of the battery device.

[0047] In some embodiments, the battery device further includes a third adhesive member; the third adhesive member adhesively bonds the reinforcing plate and the circuit board.

[0048] In the above technical solution, the reinforcing plate and the circuit board are bonded by a third adhesive to connect the reinforcing plate to the circuit board. On the one hand, this reduces the assembly difficulty between the reinforcing plate and the circuit board, and on the other hand, it reduces the phenomenon of damage to the circuit board when the reinforcing plate is assembled onto the circuit board, which is conducive to improving the assembly quality between the reinforcing plate and the circuit board.

[0049] In some embodiments, the circuit board is a flexible circuit board.

[0050] In the above technical solution, by setting the circuit board as a flexible circuit board, it is easier to set the circuit board on one side of multiple battery cells in the first direction and connect it with multiple sampling points, which helps to reduce the assembly difficulty between the circuit board and the battery cell assembly. On the other hand, it can improve the assembly flexibility of the circuit board, which is conducive to optimizing the spatial layout of the circuit board and the battery cell assembly, and also helps to reduce the risk of the circuit board being broken during use.

[0051] In some embodiments, the battery device further includes a reinforcing plate; the reinforcing plate is connected to one side of the circuit board in the first direction, and the components are soldered to the side of the circuit board opposite to the reinforcing plate in the first direction; wherein, in a projection plane perpendicular to the first direction, the orthographic projection of the components is located within the orthographic projection of the reinforcing plate.

[0052] In the above technical solution, by connecting a reinforcing plate to one side of the circuit board along the first direction and welding components to the other side, and ensuring that the orthographic projection of the components in a projection plane perpendicular to the first direction lies within the orthographic projection of the reinforcing plate in the same projection plane, the reinforcing plate can support and strengthen the circuit board when the components are welded and assembled onto it. This improves the welding quality between the components and the circuit board and reduces the risk of damage to the circuit board during component welding, thus enhancing the assembly quality. Furthermore, the reinforcing plate strengthens the area of ​​the circuit board where components are welded, further increasing the rigidity of the area where the battery monitoring component is integrated. This mitigates vibration or shaking in the first area of ​​the circuit board where the battery monitoring component is integrated during use, reducing the risk of damage to the components integrated on the circuit board.

[0053] In some embodiments, the circuit board includes a circuit board body and at least one sampling unit. Multiple components are disposed on the circuit board body. The sampling unit is electrically connected to the circuit board body, and each sampling unit is connected to a sampling point to collect the temperature signal or voltage signal of the battery cell.

[0054] In the above technical solution, the circuit board includes a circuit board body and at least one sampling part connected to the circuit board body, and each sampling part is connected to a sampling point, so that the circuit board can collect the temperature signal or voltage signal of the battery cell. The circuit board with this structure can easily connect the circuit board to multiple sampling points through multiple sampling parts, so that the circuit board can collect the temperature signal or voltage signal of multiple sampling points, and can reduce the connection difficulty between the circuit board and the sampling point, which is conducive to improving the assembly flexibility of the circuit board.

[0055] In some embodiments, in a projection plane perpendicular to the first direction, the orthographic projection of the circuit board body and the orthographic projection of the busbar are completely misaligned.

[0056] In the above technical solution, by setting the orthographic projection of the circuit board body in the projection plane perpendicular to the first direction and the orthographic projection of the busbar component in the projection plane perpendicular to the first direction to be completely misaligned, the orthographic projection of the circuit board body in the projection plane perpendicular to the first direction and the orthographic projection of the busbar component in the projection plane perpendicular to the first direction are structured to have non-overlapping areas. The battery device with this structure can reduce the interference between the circuit board body and the busbar component, which is conducive to reducing the assembly difficulty of the circuit board and the battery cell assembly. On the other hand, it can optimize the spatial layout between the circuit board body and the busbar component, so that the circuit board body and the busbar component can share space in the first direction, which is conducive to improving the space utilization of the battery device.

[0057] In some embodiments, the circuit board body includes a circuit layer and an insulating layer stacked along the first direction, wherein there is one circuit layer and two insulating layers, the circuit layer is disposed between the two insulating layers, and the components and the sampling unit are electrically connected to the circuit layer.

[0058] In the above technical solution, by setting the circuit board body as a single-layer wire harness structure with two insulating layers sandwiching a circuit layer, the circuit board with this structure can reduce the weight of the circuit board body, which is conducive to reducing the vibration or shaking of the first area of ​​the circuit board integrating the battery monitoring components during use, thereby reducing the risk of damage to components due to collision or bump. On the other hand, the insulating layers on both sides of the circuit layer can not only provide insulation and isolation for the circuit layer, but also provide buffer protection for the circuit layer. This can reduce the risk of short circuit between the circuit layer and components such as battery cells or busbars, while also reducing the risk of the circuit layer being bumped or scratched during use.

[0059] In some embodiments, the battery cell includes a housing and an electrode assembly housed within the housing; wherein the battery cell assembly further includes an insulating member, at least a portion of which is disposed between the battery sampling unit and the housing in the first direction to insulate the battery sampling unit and the housing.

[0060] In the above technical solution, the battery cell assembly is also provided with an insulating component. By setting at least a portion of the insulating component as a structure located between the battery sampling unit and the housing in a first direction, the insulating component can insulate and isolate the battery sampling unit and the housing, which helps to reduce the risk of short circuit between the battery sampling unit and the housing, thereby improving the reliability of the battery device.

[0061] In some embodiments, along the first direction, the busbar is located on the side of the insulator facing away from the housing.

[0062] In the above technical solution, by setting the busbar component on the side of the insulating member away from the outer casing in the first direction, the busbar component and the outer casing are respectively located on both sides of the insulating member in the first direction. This allows the insulating member to also serve to insulate and isolate the busbar component and the outer casing, which helps to reduce the risk of short circuit between the busbar component and the outer casing, thereby further improving the reliability of the battery device.

[0063] In some embodiments, the housing has a wall facing the circuit board in the first direction, and the battery cell further includes an electrode terminal disposed on the wall and protruding from the surface of the wall facing the circuit board. The electrode terminal is electrically connected to the electrode assembly, and the busbar is connected to the electrode terminal. The insulating member is provided with at least one second clearance hole, which penetrates the insulating member along the first direction and corresponds one-to-one with the electrode terminal. Along the first direction, the electrode terminal passes through the second clearance hole and is connected to the busbar.

[0064] In the above technical solution, by providing a second clearance hole in the area corresponding to the electrode terminal on the insulating component, the second clearance hole is a structure that penetrates the insulating component along the first direction, and the electrode terminal is a structure that passes through the second clearance hole along the first direction and is connected to the busbar component located on the side of the insulating component away from the outer shell, it is possible to reduce the assembly difficulty between the busbar component and the electrode terminal of the battery cell while achieving insulation isolation between the insulating component and the outer shell, thereby reducing the overall assembly difficulty of the battery device.

[0065] Secondly, embodiments of this application also provide an electrical device, including the battery device described above, wherein the battery device is used to provide electrical energy. Attached Figure Description

[0066] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0068] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0069] Figure 3 This is a schematic diagram of the assembly of a battery cell assembly and a battery sampling unit provided in some embodiments of this application;

[0070] Figure 4 for Figure 3 A magnified view of point A after the battery cell assembly and battery sampling unit are assembled together;

[0071] Figure 5 A partial structural schematic diagram of a battery cell assembly provided in some embodiments of this application;

[0072] Figure 6 Exploded views of partial structures of the battery device provided in some embodiments of this application;

[0073] Figure 7 This is a schematic diagram of the structure of a battery sampling unit provided in some embodiments of this application;

[0074] Figure 8 A partial front view of a battery sampling unit provided in some embodiments of this application, in a third-party orientation;

[0075] Figure 9 This is a schematic diagram of the structure of the limiting member provided in some embodiments of this application;

[0076] Figure 10 A front view of a limiting member provided in some embodiments of this application in a second direction;

[0077] Figure 11 A cross-sectional view of the circuit board body of the battery sampling unit provided in some embodiments of this application, perpendicular to a second direction.

[0078] Icons: 1000 - Vehicle; 100 - Battery Unit; 10 - Housing; 11 - First Housing Body; 12 - Second Housing Body; 20 - Battery Cell Assembly; 21 - Busbar Component; 211 - First Positioning Hole; 22 - Battery Cell; 221 - Housing; 2211 - Wall; 222 - Electrode Terminal; 223 - Pressure Relief Component; 30 - Battery Sampling Unit; 31 - Circuit Board; 311 - Circuit Board Body; 311a - Circuit Layer; 311b - Insulation Layer; 31 11-First area; 312-Sampling unit; 32-Battery monitoring component; 321-Component; 33-Waterproof protective layer; 40-Limiting component; 41-First limiting part; 411-First clearance hole; 42-Second limiting part; 421-Second positioning hole; 43-Bending part; 50-Insulating component; 51-Second clearance hole; 60-Buffer component; 70-Reinforcing plate; 200-Controller; 300-Motor; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0079] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0080] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0081] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0082] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0083] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0084] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0085] In this application, "multiple" means two or more (including two).

[0086] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0087] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0088] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0089] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0090] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0091] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0092] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05At least one of O2 and its modified compounds.

[0093] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0094] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0095] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0096] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0097] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0098] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0099] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0100] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0101] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0102] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0103] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0104] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0105] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0106] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0107] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0108] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0109] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0110] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0111] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0112] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0113] In some implementations, the electrode assembly has a stacked structure.

[0114] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0115] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0116] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0117] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0118] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0119] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0120] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0121] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0122] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0123] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0124] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0125] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0126] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0127] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0128] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0129] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0130] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0131] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0132] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0133] For a typical battery device, it may include a housing and multiple battery cells housed within the housing. These battery cells are electrically connected via a busbar to achieve series or parallel connection. In related technologies, to ensure the safety of the battery cells, a Battery Management System (BMS), a Cell Contact System (CCS), and a Cell Supervision System (CSC) are typically installed within the battery device. The battery sampling unit (BSU) collects the voltage and temperature of individual battery cells during use. The BSU communicates with the battery management system (BMS) via a battery monitoring unit, allowing the collected temperature and voltage signals to be transmitted to the BMS for processing and management, thus providing information on the battery cell's usage. However, existing battery devices, including the BMS, sampling unit, and monitoring unit, occupy a significant amount of space, resulting in low space utilization and hindering energy density improvement. Furthermore, the long transmission path between the sampling unit and monitoring unit affects the accuracy of the collected temperature and voltage data, making it difficult to effectively obtain information on battery cell usage and negatively impacting the stability and reliability of the battery device.

[0134] Based on the above considerations, in order to solve the problems of low energy density and low reliability of battery devices, this application provides a battery device including a battery cell assembly, a battery management system, a battery sampling unit, and a limiting member. The battery cell assembly includes a busbar and multiple battery cells. The busbar is located on one side of the battery cells in a first direction and is electrically connected to at least two battery cells. At least one busbar and / or at least one battery cell has a sampling point. The battery sampling unit includes a circuit board and a battery monitoring component. The circuit board is located on one side of the multiple battery cells in the first direction and is connected to the sampling point to collect temperature and / or voltage signals from the battery cells. The battery monitoring component includes multiple components disposed on and electrically connected to the circuit board. These components include at least one analog front-end, which is communicatively connected to the battery management system. The analog front-end is configured to convert the temperature and / or voltage signals collected by the circuit board into digital signals and transmit them to the battery management system. The limiting member is fixed to the battery cell assembly and includes a first limiting portion located on the side of the circuit board opposite to the battery cells in the first direction. Along a first direction, the circuit board has a first region that overlaps with the first limiting portion, and at least a portion of at least one component is disposed within the first region.

[0135] In this battery device structure, the battery device includes a battery management system and a battery sampling unit. The battery sampling unit can collect the voltage and / or temperature of individual battery cells during use. The battery monitoring component of the battery sampling unit is communicatively connected to the battery management system to transmit the temperature and / or voltage signals collected by the battery sampling unit to the battery management system for processing and management, thereby improving the reliability of the battery device. The battery monitoring component includes multiple components mounted on and electrically connected to a circuit board. This allows the battery monitoring component, which performs signal conversion and transmission between the battery sampling unit and the battery management system, to be integrated onto the circuit board of the battery sampling unit. A limiting member is fixedly provided on the individual battery cell assembly. The limiting member includes a first limiting portion located on the side of the circuit board away from the individual battery cell in a first direction. At least a portion of at least one component of the battery monitoring component is located in a first region where the circuit board and the first limiting portion overlap in the first direction, allowing the circuit board to integrate the battery monitoring component. The first area is the area where the first limiting part of the limiting member presses down and limits. This battery device structure optimizes the layout and space of the circuit board and battery monitoring components, saving space and improving space utilization. This increases the energy density of the battery device and shortens the transmission path between the circuit board and battery monitoring components, improving the accuracy of the temperature and / or voltage signals of the battery cells obtained by the battery sampling unit and battery management system. This enhances the stability and reliability of the battery device. Furthermore, by covering the first area of ​​the circuit board where the battery monitoring components are integrated with the limiting member, the limiting member can limit and press down on this area, mitigating vibration or shaking during use. This reduces the risk of damage to components integrated on the circuit board, improving the lifespan and stability of the battery device.

[0136] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application. This helps alleviate the problems of low space utilization and poor data acquisition accuracy of the battery device, thereby improving the stability and reliability of the battery device.

[0137] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0138] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0139] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0140] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0141] Please refer to Figure 2 and Figure 3 As shown, Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the assembly of a battery cell assembly 20 and a battery sampling unit 30 provided in some embodiments of this application. The battery device 100 includes a housing 10 and at least one battery cell assembly 20. The battery cell assembly 20 is housed within the housing 10. The battery cell assembly 20 includes a busbar 21 and a plurality of battery cells 22. The busbar 21 is located on one side of the battery cells 22 in a first direction X. The busbar 21 is electrically connected to at least two battery cells 22. The plurality of battery cells 22 of the same battery cell assembly 20 are stacked along a second direction Y.

[0142] The housing 10 provides assembly space for the battery cell assembly 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which cover each other, and together define an assembly space for accommodating the battery cell assembly 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0143] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0144] Optionally, in the battery device 100, the battery cell assembly 20 housed within the housing 10 can be one or more. When multiple battery cell assemblies 20 are housed within the housing 10, they can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cell assemblies 20 can be connected in both series and parallel. Multiple battery cell assemblies 20 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cell assemblies 20 is housed within the housing 10.

[0145] For example, combined Figure 2 and Figure 3 As shown, the battery device 100 includes two battery cell assemblies 20, which are arranged along a third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other.

[0146] In this embodiment, the battery cell assembly 20 includes multiple busbars 21, all of which are disposed on the same side of the multiple battery cells 22 in a first direction X. The busbars 21 are used to connect the multiple battery cells 22 to achieve electrical connection between the multiple battery cells 22. Exemplarily, the first direction X is the height direction of the battery cell 22, the second direction Y is the thickness direction of the battery cell 22, and the third direction Z is the length direction of the battery cell 22.

[0147] Among them, reference Figure 3 And please combine further Figure 4 and Figure 5 As shown, Figure 4 for Figure 3The image shows a partial enlarged view at point A after the battery cell assembly 20 and the battery sampling unit 30 are assembled together. Figure 5 This is a partial structural schematic diagram of a battery cell assembly 20 provided in some embodiments of this application. The battery cell 22 includes a housing 221, an electrode assembly (not shown), and electrode terminals 222. The electrode assembly is housed within the housing 221. Two electrode terminals 222 are provided at the end of the housing 221 facing the busbar 21 in a first direction X. The two electrode terminals 222 have opposite polarities and are used for inputting or outputting the positive and negative terminals of the battery cell 22, respectively. The busbar 21 is interconnected with the electrode terminals 222 of the battery cells 22 to electrically connect multiple battery cells 22. It should be noted that the multiple battery cells 22 in the battery cell assembly 20 can be connected in series or parallel, etc., for example, in... Figure 5 In the battery cell assembly 20, the multiple battery cells 22 are connected in series through multiple busbars 21, that is, one busbar 21 connects one electrode terminal 222 of one battery cell 22 to one electrode terminal 222 of another battery cell 22 with opposite polarity.

[0148] Optionally, each battery cell 22 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 22 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 2 and Figure 3 In the middle, the battery cell 22 has a cuboid structure.

[0149] According to some embodiments of this application, refer to Figure 3 , Figure 4 and Figure 5 Please refer to further details. Figure 6 , Figure 7 , Figure 8 and Figure 9 , Figure 6 This is an exploded view of a partial structure of the battery device 100 provided in some embodiments of this application. Figure 7 This is a schematic diagram of the structure of the battery sampling unit 30 provided in some embodiments of this application. Figure 8 This is a partial front view of the battery sampling unit 30 provided in some embodiments of this application in the third direction Z. Figure 9This is a schematic diagram of the structure of the limiting member 40 provided in some embodiments of this application. This application provides a battery device 100, which includes a battery cell assembly 20, a battery management system (not shown), a battery sampling unit 30, and a limiting member 40. The battery cell assembly 20 includes a busbar 21 and a plurality of battery cells 22. The busbar 21 is located on one side of the battery cells 22 in a first direction X, and the busbar 21 is electrically connected to at least two battery cells 22. At least one busbar 21 and / or at least one battery cell 22 is provided with a sampling point. The battery sampling unit 30 includes a circuit board 31 and a battery monitoring component 32. The circuit board 31 is disposed on the side of a plurality of battery cells 22 facing the busbar 21 in a first direction X, and is connected to a sampling point to collect temperature and / or voltage signals from the battery cells 22. The battery monitoring component 32 includes a plurality of components 321 disposed on and electrically connected to the circuit board 31. The plurality of components 321 includes at least one analog front end, which is communicatively connected to the battery management system. The analog front end is configured to convert the temperature and / or voltage signals collected by the circuit board 31 into digital signals and transmit them to the battery management system. A limiting member 40 is fixed to the battery cell assembly 20. The limiting member 40 includes a first limiting portion 41 located on the side of the circuit board 31 away from the battery cells 22 in the first direction X. Along the first direction X, the circuit board 31 has a first region 3111 that overlaps with the first limiting portion 41, and at least a portion of at least one component 321 is disposed within the first region 3111.

[0150] The battery sampling unit 30 is used to collect the voltage signal and / or temperature signal of the battery cell 22 of the battery cell assembly 20. Correspondingly, there can be one or more battery sampling units 30 for each battery cell assembly 20.

[0151] Sampling points are provided on at least one busbar component 21 and / or at least one battery cell 22. That is, sampling points can be provided on one or more busbar components 21, one or more battery cells 22, or both busbar components 21 and battery cells 22. Correspondingly, the circuit board 31 of the battery sampling unit 30 can be connected to the busbar component 21, the battery cell 22, or both, so as to enable the circuit board 31 of the battery sampling unit 30 to collect and acquire the usage information of the battery cell 22. It should be noted that the circuit board 31 can be used to collect the voltage signal of the battery cell 22, the temperature signal of the battery cell 22, or both the voltage signal and the temperature signal of the battery cell 22.

[0152] In this embodiment, the circuit board 31 of the battery sampling unit 30 is used to collect the temperature signal or voltage signal of the battery cell 22. Correspondingly, the battery sampling unit 30 is a CCS (Cells Contact System), and the circuit board 31 of the battery sampling unit 30 is the main component of the battery sampling unit 30 for collecting the voltage signal and temperature signal of the battery cell 22. The battery monitoring component 32 (equivalent to the battery monitoring unit, CSC, Cell Supervision Circuit) includes multiple components 321 disposed on the circuit board 31. That is, the multiple components 321 of the battery monitoring component 32 are structures disposed on the circuit board 31 of the battery sampling unit 30, that is, the CSC is integrated on the circuit board 31 of the CCS. Correspondingly, the battery monitoring component 32 includes at least one analog front end (AFE). The analog front end is mainly used to convert the temperature signal and / or voltage signal of the battery cell 22 collected by the circuit board 31 into digital signals and transmit them to the battery management unit (BMU) of the battery management system (BMS) for further processing.

[0153] It should be noted that the analog front-end communicates with the battery management system. The analog front-end and the battery management system can be connected by wired or wireless means. For example, in this embodiment, the analog front-end communicates with the battery management system through a daisy chain.

[0154] It should be noted that the most important component among the multiple components 321 of the battery monitoring component 32 is the analog front end (AFE). The other components 321 are auxiliary components for the analog front end to perform its functions, such as transformers, diodes, transistors, capacitors, inductors, or resistors.

[0155] It should be noted that the battery monitoring component 32 can also balance the voltage of the battery cells 22, monitor the dormancy voltage of the battery cells 22, provide early warning of thermal runaway, and perform self-diagnosis (such as simulating damage to the front end or excessive temperature).

[0156] As an example, the circuit board 31 is disposed on the side of the plurality of battery cells 22 facing the busbar 21 in the first direction X, that is, the circuit board 31 and the busbar 21 are both located on the same side of the plurality of battery cells 22 in the first direction X. For example, the busbar 21 and the circuit board 31 are both located on the side of the housing 221 of the battery cell 22 in the first direction X where the electrode terminals 222 are disposed.

[0157] Optionally, the circuit board 31 can be a flexible circuit board or a printed circuit board, etc.

[0158] It should be noted that multiple components 321 of the battery monitoring component 32 are mounted on the circuit board 31 and electrically connected to the wiring harness within the circuit board 31, so that the temperature signal and / or voltage signal of the battery cell 22 collected by the circuit board 31 can be transmitted to the battery monitoring component 32 for processing.

[0159] In this embodiment of the application, the limiting member 40 is disposed on the battery cell assembly 20, and the limiting member 40 plays the role of pressing down and limiting the circuit board 31. The limiting member 40 is fixed to the battery cell assembly 20, that is, the limiting member 40 is fastened to the battery cell assembly 20, so that the limiting member 40 cannot be disengaged from the battery cell assembly 20 in the first direction X.

[0160] The structure in which the limiting member 40 is fixed to the battery cell assembly 20 can be varied. For example, the limiting member 40 can be fixed to the busbar component 21 or the battery cell 22. In embodiments where the battery cell assembly 20 also includes an insulating member 50, the limiting member 40 can also be fixed to the insulating member 50. Similarly, the limiting member 40 can be fixed to the battery cell assembly 20 in various ways, such as by bonding, snap-fitting, riveting, or bolting.

[0161] The limiting member 40 includes a first limiting portion 41 located on the side of the circuit board 31 away from the battery cell 22 in the first direction X. That is, the first limiting portion 41 is the part of the limiting member 40 located on the side of the circuit board 31 away from the battery cell 22 in the first direction X. In other words, at least a part of the limiting portion is a structure located between the first limiting portion 41 and the battery cell 22 in the first direction X. For example, the first limiting portion 41 of the limiting member 40, the circuit board 31 and the outer shell 221 of the battery cell 22 are arranged along the first direction X.

[0162] Along the first direction X, the circuit board 31 has a first region 3111 that overlaps with the first limiting part 41. That is, in the projection plane perpendicular to the first direction X, the area where the orthographic projection of the circuit board 31 and the orthographic projection of the first limiting part 41 overlap is the first region 3111 of the circuit board 31. In other words, the area of ​​the circuit board 31 covered by the first limiting part 41 in the first direction X is the first region 3111.

[0163] At least a portion of at least one component 321 is disposed within the first region 3111. That is, at least a portion of at least one component 321 of the battery monitoring component 32 is disposed in the region of the circuit board 31 covered by the first limiting portion 41 in the first direction X. This results in the first limiting portion 41 of the limiting member 40 being disposed opposite to the region of the circuit board 31 in which the battery monitoring component 32 is integrated in the first direction X. This results in at least a portion of the orthographic projection of at least one component 321 of the battery monitoring component 32 being disposed in the projection plane perpendicular to the first direction X, which overlaps with the orthographic projection of the first limiting portion 41.

[0164] For example, the limiting member 40 can be made of various materials. For instance, the limiting member 40 can be made of non-metallic materials, such as ceramic, epoxy resin or plastic, or it can be made of metallic materials, such as copper, iron, steel or aluminum alloy.

[0165] In this embodiment, the battery device 100 is provided with a battery management system and a battery sampling unit 30. The battery sampling unit 30 can collect the voltage and / or temperature of the battery cells 22 during use, and the battery monitoring component 32 of the battery sampling unit 30 is communicatively connected to the battery management system to transmit the temperature signal and / or voltage signal collected by the battery sampling unit 30 to the battery management system for processing and management, which helps to improve the reliability of the battery device 100. The battery monitoring component 32 includes multiple components 321 disposed on the circuit board 31, which are used to monitor the voltage and / or temperature of the battery cells 22 during use. The battery monitoring component 32, which performs signal conversion and transmission between the battery management system and the battery sampling unit 30, is integrated on the circuit board 31 of the battery sampling unit 30. A limiting member 40 is fixedly provided on the battery cell assembly 20. The limiting member 40 includes a first limiting portion 41 located on the side of the circuit board 31 facing away from the battery cell 22 in the first direction X. At least a portion of at least one component 321 of the battery monitoring component 32 is disposed within a first region 3111 where the circuit board 31 and the first limiting portion 41 overlap in the first direction X. This ensures that the first region 3111 of the circuit board 31 for integrating the battery monitoring component 32 is... The area pressed down and limited by the first limiting part 41 of the limiting member 40 allows the battery device 100 with this structure to optimize the layout and space of the circuit board 31 and the battery monitoring component 32, saving the overall space occupied by the circuit board 31 and the battery monitoring component 32, thereby improving the space utilization rate of the battery device 100 and improving the energy density of the battery device 100. Furthermore, it can shorten the transmission path between the circuit board 31 and the battery monitoring component 32, thereby improving the accuracy of the temperature and / or voltage signals of the battery cells 22 obtained by the battery sampling unit 30 and the battery management system, thus improving the battery's performance. The device 100 improves stability and reliability in use. On the other hand, the limiting member 40 covers the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated, so that the limiting member 40 can limit and press down on the area of ​​the circuit board 31 where the battery monitoring component 32 is integrated. This can alleviate the phenomenon of vibration or shaking in the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated during use, thereby reducing the risk of damage to the components 321 of the battery monitoring component 32 integrated on the circuit board 31, and improving the service life and stability of the battery device 100.

[0166] According to some embodiments of this application, in conjunction with Figure 3 , Figure 4 , Figure 6 and Figure 9As shown, the limiting member 40 may further include a second limiting part 42, which is connected to the first limiting part 41 and fixed to the battery cell assembly 20. In a projection plane perpendicular to the first direction X, the orthographic projection of the second limiting part 42 and the orthographic projection of the circuit board 31 are completely misaligned.

[0167] The second limiting part 42 is the part that is fixedly connected to the battery cell assembly 20. Correspondingly, the first limiting part 41 is a structure that is fixed to the battery cell assembly 20 by the second limiting part 42. Optionally, the second limiting part 42 can be a structure fixed to the busbar component 21 or a structure fixed to the battery cell 22. Of course, in embodiments where the battery cell assembly 20 also includes an insulating member 50, the second limiting part 42 can also be a structure fixed to the insulating member 50. Similarly, the second limiting part 42 can be fixed to the battery cell assembly 20 in various ways, such as by bonding, snap-fitting, riveting, or bolting.

[0168] Optionally, the number of second limiting parts 42 connected to the first limiting part 41 can be one or more.

[0169] In the projection plane perpendicular to the first direction X, the orthographic projection of the second limiting part 42 and the orthographic projection of the circuit board 31 are completely misaligned. That is, in the projection plane perpendicular to the first direction X, the orthographic projection of the second limiting part 42 and the orthographic projection of the circuit board 31 do not have overlapping areas, so that the orthographic projection of the second limiting part 42 and the orthographic projection of the circuit board 31 are arranged in a structure that is spaced apart from each other.

[0170] In this embodiment, the second limiting part 42 is the portion of the limiting member 40 that is fixed to the battery cell assembly 20, so that the first limiting part 41 is fixed to the battery cell assembly 20 by the second limiting part 42. By setting the orthographic projection of the second limiting part 42 in a projection plane perpendicular to the first direction X and the orthographic projection of the circuit board 31 in a projection plane perpendicular to the first direction X to be completely misaligned, the orthographic projection of the second limiting part 42 in a projection plane perpendicular to the first direction X and the orthographic projection of the circuit board 31 in a projection plane perpendicular to the first direction X are completely misaligned. The orthographic projection in the shadow plane is a structure with no overlapping areas. The battery device 100 with this structure can reduce the interference between the second limiting part 42 and the circuit board 31, thereby reducing the risk of the second limiting part 42 pressing down on or damaging the circuit board 31. On the other hand, it facilitates the first limiting part 41 to limit and press down on the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated, which is beneficial to improving the stability and reliability of the limiting member 40 in limiting the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated.

[0171] According to some embodiments of this application, refer to Figure 4, Figure 5 and Figure 9 Please refer to further details. Figure 10 As shown, Figure 10 The image shows a front view of the limiting member 40 provided in some embodiments of this application in the second direction Y. The battery cell 22 includes a housing 221 having a wall portion 2211 facing the circuit board 31 in the first direction X. The limiting member 40 is bent to form a bend 43, and each second limiting portion 42 is connected to the first limiting portion 41 via a bend 43. Along the first direction X, the second limiting portion 42 is closer to the wall portion 2211 than the first limiting portion 41.

[0172] The outer casing 221 has multiple walls that are interconnected and enclose a cavity for accommodating the electrode assembly. Correspondingly, the wall portion 2211 is a wall of the outer casing 221 facing the circuit board 31 in the first direction X.

[0173] The limiting member 40 is bent to form a bent portion 43. Each second limiting portion 42 is connected to the first limiting portion 41 through a bent portion 43. As an example, the first limiting portion 41, the bent portion 43, and the second limiting portion 42 of the limiting member 40 are integrally formed. Correspondingly, the bent portion 43 is the part of the limiting member 40 formed by bending and connected between the first limiting portion 41 and the second limiting portion 42. The bent portion 43 and the second limiting portion 42 are arranged in a one-to-one correspondence, so that each second limiting portion 42 is connected to the first limiting portion 41 through a bent portion 43.

[0174] Along the first direction X, the second limiting portion 42 is closer to the wall portion 2211 than the first limiting portion 41. That is, the surface of the first limiting portion 41 facing the wall portion 2211 in the first direction X is farther away from the wall portion 2211 than the surface of the second limiting portion 42 facing away from the wall portion 2211 in the first direction X. This makes the second limiting portion 42, as a whole, closer to the wall portion 2211 than the first limiting portion 41 in the first direction X. This results in a structure where the second limiting portion 42 and the first limiting portion 41 are separated by a distance in the first direction X. The bent portion 43 is a bent structure connecting the first limiting portion 41 and the second limiting portion 42.

[0175] In this embodiment, the limiting member 40 is bent to form a bent portion 43, which connects the first limiting portion 41 and the second limiting portion 42. The second limiting portion 42 is closer to the wall portion 2211 in the first direction X than the first limiting portion 41. This results in the first limiting portion 41 and the bent portion 43 of the limiting member 40 protruding from the surface of the second limiting portion 42 on the side away from the wall portion 2211. The limiting member 40 with this structure can, on the side of the limiting member 40 facing the wall portion 2211 and corresponding to the first limiting portion 41, form a structure where the first limiting portion 41 is on the side of the limiting member 40 facing the wall portion 2211. The area forms a receiving space so that the circuit board 31 located on the side of the first limiting part 41 facing the outer shell 221 can be received through the receiving space. This allows the circuit board 31 and the limiting part 40 to share space in the first direction X, which is beneficial to improving the space utilization of the battery device 100. It can also provide a certain degree of protection for the first area 3111 of the circuit board 31. On the other hand, it is convenient to fix the second limiting part 42 on the battery cell assembly 20, which helps to reduce the assembly difficulty between the limiting part 40 and the battery cell assembly 20.

[0176] According to some embodiments of this application, in conjunction with Figure 4 and Figure 9 As shown, the limiting member 40 includes a plurality of second limiting parts 42, all of which are connected to the first limiting part 41, and each second limiting part 42 is fixed to the battery cell assembly 20.

[0177] For example, in Figure 9 In the first limiting member 40, three second limiting parts 42 are provided, and one second limiting part 42 is connected to one end of the first limiting part 41 in the third direction Z, and two second limiting parts 42 are connected to the other end. Of course, in other embodiments, the number of second limiting parts 42 connected to the first limiting part 41 can also be two, four, five, six or more.

[0178] Optionally, in an embodiment where a plurality of second limiting portions 42 are connected to the same end of the first limiting portion 41 in the third direction Z, the plurality of second limiting portions 42 connected to the same end of the first limiting portion 41 in the third direction Z are arranged at intervals along the second direction Y.

[0179] In this embodiment, by connecting multiple second limiting parts 42 to the first limiting part 41, and each second limiting part 42 being fixed on the battery cell assembly 20, the stability and reliability of the limiting member 40 assembled on the battery cell assembly 20 can be further improved. This is beneficial to further improving the stability and reliability of the limiting member 40 in limiting the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated.

[0180] In some embodiments, see Figure 3 , Figure 4and Figure 9 As shown, the battery cell assembly 20 includes at least one row of battery cells 22. Each row of battery cells 22 includes multiple battery cells 22 stacked along the second direction Y. The circuit board 31 extends along the second direction Y, and a busbar component 21 is provided on both sides of the circuit board 31 in the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Along the third direction Z, the two ends of the first limiting part 41 are connected to the second limiting part 42.

[0181] Optionally, the second limiting part 42 connected to the same end of the first limiting part 41 in the third direction Z can be one or more.

[0182] For example, in a projection plane perpendicular to the third direction Z, the orthographic projections of the plurality of second limiting parts 42 are completely misaligned, that is, the orthographic projections of the plurality of second limiting parts 42 do not have overlapping areas.

[0183] In this embodiment, by connecting the first limiting part 41 to both sides of the third direction Z, the two ends of the first limiting part 41 in the third direction Z can be fixed to the battery cell assembly 20 by the second limiting part 42. This further enhances the effect of the busbar component 21 in restricting the limiting member 40 from moving away from the battery cell 22 in the first direction X, thereby further improving the stability and reliability of the limiting member 40 assembled on the battery cell assembly 20. This, in turn, helps to further improve the stability and reliability of the limiting member 40 in limiting the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated.

[0184] According to some embodiments of this application, refer to Figure 4 and Figure 9 As shown, the second limiting part 42 is fixed to the busbar component 21.

[0185] The structure by which the second limiting part 42 is fixed to the busbar component 21 can be varied. For example, the second limiting part 42 can be connected to the busbar component 21 by means of adhesive bonding, snap-fitting, riveting, or bolting. Similarly, the second limiting part 42 can be at least partially located on the side of the busbar component 21 facing away from the battery cell 22 in the first direction X, or it can be at least partially located on the side of the busbar component 21 facing the battery cell 22 in the first direction X. For example, at least part of the second limiting part 42 is located on the side of the busbar component 21 facing the battery cell 22 in the first direction X and is connected to the busbar component 21.

[0186] As an example, the two electrode terminals 222 of the battery cell 22 are arranged at intervals along the third direction Z, so that the two busbars 21 connected to the same battery cell 22 are also arranged at intervals along the third direction Z. At least a portion of the circuit board 31 is arranged in the third direction Z between the two electrode terminals 222 of the battery cell 22 of the corresponding battery cell assembly 20. Correspondingly, the first limiting part 41 may be a structure in which the two ends of the third direction Z are connected to the second limiting part 42, and the second limiting part 42 is correspondingly connected to the busbar 21 located on the same side of the first limiting part 41.

[0187] In this embodiment, the second limiting part 42 of the limiting member 40 is configured to be fixed on the busbar component 21, so as to fix the limiting member 40 to the battery cell assembly 20.

[0188] According to some embodiments of this application, see Figure 4 and Figure 9 As shown, along the first direction X, at least a portion of the second limiting portion 42 is located on the side of the busbar 21 facing the battery cell 22.

[0189] Along the first direction X, at least a portion of the second limiting portion 42 is located on the side of the busbar 21 facing the battery cell 22, that is, at least a portion of the busbar 21 is located on the side of the second limiting portion 42 away from the battery cell 22 in the first direction X.

[0190] Optionally, the number of second limiting portions 42 connected to the first limiting portion 41 can be one or more. It should be noted that in an embodiment where multiple second limiting portions 42 are connected to the first limiting portion 41, at least a portion of each second limiting portion 42 is located on the side of a busbar 21 facing the battery cell 22 in the first direction X. That is, each second limiting portion 42 is a structure corresponding to a busbar 21, and at least a portion of each second limiting portion 42 is located on the side of the corresponding busbar 21 facing the battery cell 22 in the first direction X.

[0191] As an example, the two electrode terminals 222 of the battery cell 22 are arranged at intervals along the third direction Z, so that the two busbars 21 connected to the same battery cell 22 are also arranged at intervals along the third direction Z, and at least a portion of the circuit board 31 is arranged in the third direction Z between the two electrode terminals 222 of the battery cell 22 of the corresponding battery cell assembly 20. Correspondingly, the first limiting part 41 is a structure in which a second limiting part 42 is connected to at least one side in the third direction Z.

[0192] In this embodiment, by configuring at least a portion of the second limiting part 42 to be located on the side of the busbar component 21 facing the battery cell 22 in the first direction X, the busbar component 21 can also play a certain limiting role on the limiting member 40 to restrict the second limiting part 42 from moving away from the battery cell 22 in the first direction X. This can further improve the stability and reliability of the second limiting part 42 fixed on the busbar component 21, so that the first limiting part 41 of the limiting member 40 can play a limiting and pressing role on the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated. This is beneficial to improving the stability and reliability of the limiting member 40 in limiting the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated.

[0193] According to some embodiments of this application, in conjunction with Figure 4 , Figure 5 and Figure 9 As shown, the battery cell 22 may include a housing 221, an electrode assembly, and electrode terminals 222. The housing 221 has a wall portion 2211 facing the circuit board 31 in a first direction X. The electrode assembly is housed within the housing 221. The electrode terminals 222 are disposed on the wall portion 2211 and protrude from the surface of the wall portion 2211 facing the circuit board 31, and the electrode terminals 222 are electrically connected to the electrode assembly. Along the first direction X, a busbar 21 is connected to the electrode terminals 222, and at least a portion of the second limiting portion 42 is located between the busbar 21 and the wall portion 2211.

[0194] The outer casing 221 has multiple walls that are interconnected and enclose a cavity for accommodating the electrode assembly. Correspondingly, the wall portion 2211 is a wall of the outer casing 221 facing the circuit board 31 in the first direction X.

[0195] Electrode terminal 222 is disposed on wall portion 2211 and protrudes from the surface of wall portion 2211 facing circuit board 31. That is, electrode terminal 222 is disposed on the wall of housing 221 facing circuit board 31 in the first direction X. Electrode terminal 222 protrudes from the surface of wall portion 2211 away from electrode assembly in the first direction X. Busbar 21 is connected to the end of electrode terminal 222 away from electrode assembly in the first direction X. That is, busbar 21 and electrode terminal 222 are arranged and connected in the first direction X.

[0196] For example, the busbar component 21 and the electrode terminal 222 are welded together.

[0197] Along the first direction X, at least a portion of the second limiting part 42 is located between the merging component 21 and the wall portion 2211, that is, the second limiting part 42 of the limiting member 40 is at least partially inserted into the gap between the merging component 21 and the wall portion 2211, so that the merging component 21, the second limiting part 42 and the wall portion 2211 are arranged sequentially along the first direction X.

[0198] In this embodiment, the electrode terminal 222 of the battery cell 22 is disposed on the wall portion 2211 of the housing 221 facing the circuit board 31 and protrudes from the surface of the wall portion 2211 facing the circuit board 31. The busbar component 21 is connected to the electrode terminal 222. By setting at least a portion of the second limiting portion 42 between the busbar component 21 and the wall portion 2211 in the first direction X, the busbar component 21 and the wall portion 2211 can cooperate to restrict or clamp the second limiting portion 42. This further improves the stability and reliability of the limiting member 40 fixed on the battery cell assembly 20, and further improves the stability and reliability of the limiting member 40 in limiting the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated.

[0199] According to some embodiments of this application, in conjunction with Figure 4 and Figure 9 As shown, the busbar component 21 is provided with a first positioning hole 211, and the second limiting part 42 is provided with a second positioning hole 421. Along the first direction X, the second positioning hole 421 on the second limiting part 42 is positioned opposite to the first positioning hole 211 on the corresponding busbar component 21.

[0200] The first positioning hole 211 penetrates the confluence component 21 along the first direction X, and the second positioning hole 421 penetrates the second limiting part 42 along the first direction X. Along the first direction X, the second positioning hole 421 on the second limiting part 42 is positioned opposite to the corresponding first positioning hole 211 on the confluence component 21. That is, in the correspondingly positioned second limiting part 42 and confluence component 21, the second positioning hole 421 on the second limiting part 42 and the first positioning hole 211 on the confluence component 21 are structurally corresponding in position along the first direction X, such that in a projection plane perpendicular to the first direction X, at least a portion of the orthographic projection of the second positioning hole 421 on the second limiting part 42 overlaps with the orthographic projection of the first positioning hole 211 on the confluence component 21.

[0201] During the assembly of the limiting member 40 and the confluence component 21, a positioning pin can be simultaneously inserted into the second positioning hole 421 on the second limiting part 42 and the first positioning hole 211 on the confluence component 21 to achieve the position positioning between the limiting member 40 and the confluence component 21.

[0202] In this embodiment, by setting the first positioning hole 211 on the busbar component 21 and the second positioning hole 421 on the limiting part 42 to be arranged opposite to each other in the first direction X, the limiting member 40 and the busbar component 21 can be positioned relative to each other through the first positioning hole 211 on the busbar component and the second positioning hole 421 on the limiting part 42 during the assembly process of the battery device 100. This helps to improve the assembly accuracy between the limiting member 40 and the busbar component 21, thereby improving the assembly quality of the battery device 100.

[0203] In some embodiments, please continue to see Figure 3 and Figure 4 As shown, the battery device 100 may also include a first adhesive member (not shown in the figure), which adhesively bonds the second limiting part 42 and the busbar component 21.

[0204] The first adhesive component serves to connect the second limiting part 42 and the confluence component 21. The structure of the first adhesive component can be various. For example, the first adhesive component can be tape, adhesive paper, etc., which are used to bond the second limiting part 42 and the confluence component 21, or it can be glue, hot melt adhesive, or double-sided tape, etc., which are disposed between the second limiting part 42 and the confluence component 21.

[0205] In this embodiment, the second limiting part 42 and the busbar component 21 are bonded together by the first adhesive to fix the second limiting part 42 to the busbar component 21, which helps to reduce the assembly difficulty between the second limiting part 42 and the busbar component 21.

[0206] Of course, the structure of the battery device 100 is not limited to this. In some embodiments, the battery device 100 can also have other structures, such as the second limiting part 42 being fixed to the battery cell 22.

[0207] The structure by which the second limiting part 42 is fixed to the battery cell 22 can be varied. For example, the second limiting part 42 can be connected to the busbar component 21 by means of adhesive or snap-fit. Similarly, the second limiting part 42 can be a structure fixed to the outer shell 221 of the battery cell 22, or it can be a structure fixed to the electrode terminal 222.

[0208] In this embodiment, the second limiting part 42 of the limiting member 40 is configured to be fixed on the battery cell 22, so as to fix the limiting member 40 to the battery cell assembly 20.

[0209] In an embodiment where the second limiting portion 42 is fixed to the battery cell 22, the battery device 100 further includes a second adhesive member that bonds the second limiting portion 42 and the battery cell 22.

[0210] The second adhesive component serves to connect the second limiting part 42 and the battery cell 22. The structure of the second adhesive component can be various. For example, the second adhesive component can be tape, adhesive paper, etc., which are used to bond the second limiting part 42 and the battery cell 22, or it can be glue, hot melt adhesive, or double-sided tape, etc., which are placed between the second limiting part 42 and the battery cell 22.

[0211] In this embodiment, the second limiting part 42 and the battery cell 22 are bonded together by the second adhesive to fix the second limiting part 42 to the battery cell 22, which helps to reduce the assembly difficulty between the second limiting part 42 and the battery cell 22.

[0212] Of course, in embodiments where the battery cell assembly 20 also includes an insulating member 50, the battery device 100 may also have other structures. For example, the battery cell assembly 20 may also include an insulating member 50, at least a portion of which is disposed between the battery sampling unit 30 and the battery cell 22 in the first direction X, and the second limiting portion 42 is fixed to the insulating member 50.

[0213] The structure by which the second limiting part 42 is fixed to the insulating member 50 can be varied. For example, the second limiting part 42 can be connected to the insulating member 50 by means of bonding, riveting or snap-fitting.

[0214] In this embodiment, the second limiting part 42 of the limiting member 40 is configured to be fixed on the insulating member 50, so as to fix the limiting member 40 to the battery cell assembly 20.

[0215] In the embodiment where the second limiting portion 42 is fixed to the insulating member 50, the battery device 100 may further include a connector that rivets the second limiting portion 42 and the insulating member 50. That is, the connector is a rivet structure that connects the second limiting member 40 and the insulating member 50; specifically, the connector passes through the second limiting portion 42 and the insulating member 50 along the first direction X and is riveted to connect them. The specific structure of the connector can be found in related technologies and will not be elaborated here.

[0216] In this embodiment, the second limiting part 42 and the insulating part 50 are riveted together by a connector to fix the second limiting part 42 on the insulating part 50, which helps to improve the connection stability and firmness between the second limiting part 42 and the insulating part 50.

[0217] According to some embodiments of this application, in conjunction with Figure 4 , Figure 5 and Figure 9As shown, the battery cell 22 may include a housing 221, an electrode assembly, and electrode terminals 222. The housing 221 has a wall portion 2211 facing the circuit board 31 in the first direction X. The electrode assembly is housed within the housing 221. The electrode terminals 222 are disposed on the wall portion 2211 and are electrically connected to the electrode assembly. A busbar component 21 is connected to the electrode terminals 222. The battery cell 22 may also include a pressure relief component 223, which is disposed on the wall portion 2211. A first limiting portion 41 has a first clearance hole 411 in the first direction X corresponding to the area of ​​the pressure relief component 223. The first clearance hole 411 extends through the first limiting portion 41 along the first direction X.

[0218] The pressure relief component 223 is disposed on the wall portion 2211 of the outer casing 221. That is, the pressure relief component 223 is a structure disposed on the end of the outer casing 221 facing the circuit board 31 in the first direction X. It should be noted that the pressure relief component 223 is used to release the internal pressure of the battery cell 22. That is, the pressure relief component 223 is used to release the internal pressure of the battery cell 22 when the internal pressure or temperature of the battery cell 22 reaches a predetermined value.

[0219] Optionally, the pressure relief component 223 and the wall portion 2211 can be an integrally formed structure or a separate structure. If the pressure relief component 223 and the wall portion 2211 are an integrally formed structure, then the pressure relief component 223 is a region on the wall portion 2211 with a weak structure, such as a region on the wall portion 2211 with a groove. If the pressure relief component 223 and the wall portion 2211 are separate structures, then the pressure relief component 223 can be connected to the wall portion 2211 by welding or other means. Correspondingly, the pressure relief component 223 can be a component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve, or safety valve.

[0220] For example, in this embodiment of the application, the pressure relief component 223 and the wall portion 2211 are separately disposed. Correspondingly, the wall portion 2211 is provided with a pressure relief hole that penetrates the wall portion 2211 in the first direction X. The pressure relief component 223 is connected to the wall portion 2211 and blocks the pressure relief hole.

[0221] The first limiting part 41 is provided with a first clearance hole 411 in the area corresponding to the pressure relief component 223 in the first direction X. That is, the first limiting part 41 is provided with a first clearance hole 411 for avoiding the pressure relief component 223 in the area where it overlaps with the pressure relief component 223 in the first direction X, so that at least a part of the orthographic projection of the pressure relief component 223 is located in the orthographic projection of the hole wall of the corresponding first clearance hole 411 in the projection plane perpendicular to the first direction X.

[0222] In this embodiment, by providing a first clearance hole 411 in the area of ​​the pressure relief component 223 of the battery cell 22 in the first direction X of the first limiting part 41 of the limiting member 40, and the first clearance hole 411 penetrating the first limiting part 41 in the first direction X, the obstruction of the first limiting part 41 to the pressure relief component 223 can be reduced when the battery cell 22 experiences thermal runaway and is depressurized through the pressure relief component 223. This is beneficial to improving the pressure relief effect of the battery cell 22 and reducing the risk of the battery cell 22 further causing an explosion.

[0223] According to some embodiments of this application, the limiting member 40 is made of insulating material.

[0224] For example, the limiting member 40 may be made of epoxy resin, ceramic or plastic, etc.

[0225] In this embodiment, by setting the limiting member 40 to an insulating material, the risk of short circuit between the limiting member 40 and the circuit board 31 and between the limiting member 40 and the battery cell assembly 20 is reduced, which helps to improve the reliability of the battery device 100.

[0226] According to some embodiments of this application, see Figure 4 and Figure 6 As shown, the battery device 100 may further include a buffer 60, at least a portion of which is disposed in the first direction X between the first limiting portion 41 and the circuit board 31.

[0227] The buffer 60 is a structure in which at least part of the buffer is clamped between the circuit board 31 and the first limiting part 41 of the limiting member 40 in the first direction X, so that the first limiting part 41 is in indirect contact with the circuit board 31 through the buffer 60, so that the buffer 60 can play a buffering role between the circuit board 31 and the first limiting part 41.

[0228] For example, the material of the cushioning element 60 can be various, such as foam, pearl cotton, or polyurethane.

[0229] It should be noted that in the implementation where the first clearance hole 411 is provided in the area of ​​the first limiting part 41 corresponding to the pressure relief component 223, the buffer 60 can also be provided with a third clearance hole in the area of ​​the buffer 60 corresponding to the pressure relief component 223 in the first direction X, and the third clearance hole penetrates the buffer 60 along the first direction X.

[0230] In this embodiment, along the first direction X, a buffer 60 is provided between the first limiting part 41 and the circuit board 31, so that the buffer 60 can play a certain buffering role between the first limiting part 41 and the circuit board 31, thereby reducing the rigid contact and collision between the first limiting part 41 and the circuit board 31. Thus, while the first limiting part 41 of the limiting part 40 limits the circuit board 31, it can also reduce the bumps and collisions between the circuit board 31 and the first limiting part 41, thereby further reducing the risk of damage to the components 321 integrated on the circuit board 31 of the battery monitoring component 32, which is beneficial to improving the service life and operational stability of the battery device 100.

[0231] According to some embodiments of this application, in conjunction with Figure 3 , Figure 4 and Figure 8 As shown, along the first direction X, multiple components 321 are disposed on the side of the circuit board 31 facing the battery cell 22. That is to say, the multiple components 321 integrated on the circuit board 31 by the battery monitoring component 32 are a structure mounted on the surface of the circuit board 31 facing the battery cell 22.

[0232] In this embodiment, by setting the component 321 of the battery monitoring component 32 integrated on the circuit board 31 to be located on the side of the circuit board 31 facing the battery cell 22 in the first direction X, the component 321 of the battery monitoring component 32 integrated on the circuit board 31 is positioned between the circuit board 31 and the battery cell 22 in the first direction X. This provides a certain degree of protection for the component 321 of the battery monitoring component 32 integrated on the circuit board 31, reducing the impact or wear of the component 321 of the battery monitoring component 32 integrated on the circuit board 31 during use. On the other hand, it facilitates the sharing of some space between the component 321 of the battery monitoring component 32 integrated on the circuit board 31 and the battery cell assembly 20 in the first direction X, which is beneficial to optimizing the spatial layout of the battery device 100 and improving the space utilization rate of the battery device 100.

[0233] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, a waterproof protective layer 33 is provided on the surface of the circuit board 31, and the waterproof protective layer 33 covers multiple components 321.

[0234] The waterproof protective layer 33 is a coating structure or a connected waterproof protective film that is applied to the surface of the circuit board 31 on the side where the multiple components 321 of the battery monitoring component 32 are assembled on the circuit board 31. The components 321 are located between the waterproof protective layer 33 and the circuit board 31 in the first direction X.

[0235] For example, the waterproof protective layer 33 can be made of various materials, such as photosensitive resin (UV resin), acrylate, polyurethane, epoxy resin or silicone.

[0236] In this embodiment, by providing a waterproof protective layer 33 on the surface of the circuit board 31, and the waterproof protective layer 33 having a structure that covers multiple components 321, the components 321 of the battery monitoring component 32 integrated on the circuit board 31 are located between the circuit board 31 and the waterproof protective layer 33. Thus, the waterproof protective layer 33 can provide a certain degree of protection and waterproofing for the components 321 of the battery monitoring component 32 integrated on the circuit board 31, thereby effectively reducing the risk of bumps or wear to the components 321 of the battery monitoring component 32 integrated on the circuit board 31 during use, and effectively reducing the phenomenon of moisture damage or short circuit of the components 321 of the battery monitoring component 32 integrated on the circuit board 31, thereby further improving the stability and reliability of the battery device 100.

[0237] According to some embodiments of this application, see Figure 4 and Figure 6 As shown, the battery device 100 may further include a reinforcing plate 70, which is connected to the circuit board 31, and the reinforcing plate 70 and the component 321 are respectively disposed on both sides of the circuit board 31 in the first direction X. In a projection plane perpendicular to the first direction X, at least a portion of the orthographic projection of at least one component 321 is located within the orthographic projection of the reinforcing plate 70.

[0238] The reinforcing plate 70 is connected to the circuit board 31, and the reinforcing plate 70 and the component 321 are respectively disposed on both sides of the circuit board 31 in the first direction X. That is, the reinforcing plate 70 is a structure connected to the surface of the circuit board 31 on the side away from the component 321 in the first direction X, so that the circuit board 31 is a structure located between the reinforcing plate 70 and the component 321 in the first direction X.

[0239] In a projection plane perpendicular to the first direction X, at least a portion of the orthographic projection of at least one component 321 is located within the orthographic projection of the reinforcing plate 70, that is, the reinforcing plate 70 is connected to the area of ​​the circuit board 31 where the component 321 is located.

[0240] For example, the reinforcing plate 70 can be made of various materials, such as epoxy resin, plastic or carbon fiber.

[0241] In this embodiment, by connecting a reinforcing plate 70 to the circuit board 31, and with the reinforcing plate 70 and components 321 respectively disposed on both sides of the circuit board 31 in the first direction X, the reinforcing plate 70 can strengthen the structural strength of the circuit board 31 when multiple components 321 of the battery monitoring component 32 are integrated on the circuit board 31, thereby providing a certain support for the components 321 of the battery monitoring component 32 integrated on the circuit board 31. This is beneficial to improving the assembly quality and assembly effect of the components 321 of the battery monitoring component 32 integrated on the circuit board 31. On the other hand, the reinforcing plate 70 can strengthen the structural strength of the area of ​​the circuit board 31 where multiple components 321 of the battery monitoring component 32 are integrated, thereby further improving the rigidity of the area of ​​the circuit board 31 where the battery monitoring component 32 is integrated. This can alleviate the phenomenon of vibration or shaking in the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated during use, thereby reducing the risk of damage to the components 321 of the battery monitoring component 32 integrated on the circuit board 31.

[0242] In some embodiments, the thickness of the reinforcing plate 70 along the first direction X is 0.2 mm to 1 mm. That is, the wall thickness of the reinforcing plate 70 is 0.2 mm to 1 mm.

[0243] For example, the thickness of the reinforcing plate 70 in the first direction X can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm or 1mm, etc.

[0244] In this embodiment, on the one hand, the thickness of the reinforcing plate 70 in the first direction X is set to be greater than or equal to 0.2 mm to improve the structural strength of the reinforcing plate 70, thereby improving the effect of the reinforcing plate 70 in strengthening the structural strength of the area of ​​the circuit board 31 where the battery monitoring component 32 is integrated. On the other hand, the thickness of the reinforcing plate 70 in the first direction X is set to be less than or equal to 1 mm to reduce the phenomenon of excessive waste of the reinforcing plate 70 and save the space occupied by the reinforcing plate 70 in the first direction X, which is beneficial to improving the energy density of the battery device 100.

[0245] In some embodiments, see Figure 4 and Figure 6 As shown, the battery device 100 may also include a third adhesive (not shown in the figure), which adhesively bonds the reinforcing plate 70 and the circuit board 31.

[0246] The third adhesive component serves to connect the reinforcing plate 70 and the circuit board 31. The structure of the third adhesive component can be various. For example, the third adhesive component can be tape, adhesive paper, etc., which are used to bond the reinforcing plate 70 and the circuit board 31, or it can be glue, hot melt adhesive, or double-sided tape, etc., placed between the reinforcing plate 70 and the circuit board 31.

[0247] In this embodiment, the reinforcing plate 70 and the circuit board 31 are bonded together by a third adhesive to connect the reinforcing plate 70 to the circuit board 31. This reduces the assembly difficulty between the reinforcing plate 70 and the circuit board 31 and also reduces the possibility of damage to the circuit board 31 when the reinforcing plate 70 is assembled onto it, thereby improving the assembly quality between the reinforcing plate 70 and the circuit board 31.

[0248] According to some embodiments of this application, circuit board 31 is a flexible circuit board. The specific structure of the flexible circuit board can be found in related technologies and will not be described in detail here.

[0249] In this embodiment, by setting the circuit board 31 as a flexible circuit board 31, it is convenient to set the circuit board 31 on one side of multiple battery cells 22 in the first direction X and connect it with multiple sampling points, which helps to reduce the assembly difficulty between the circuit board 31 and the battery cell assembly 20. On the other hand, it can improve the assembly flexibility of the circuit board 31, which is conducive to optimizing the spatial layout of the circuit board 31 and the battery cell assembly 20, and also helps to reduce the risk of the circuit board 31 being broken during use.

[0250] In some embodiments, see Figure 4 and Figure 6 As shown, the battery device 100 may further include a reinforcing plate 70, which is connected to one side of the circuit board 31 in the first direction X, and the component 321 is soldered to the side of the circuit board 31 in the first direction X opposite to the reinforcing plate 70. In a projection plane perpendicular to the first direction X, the orthographic projection of the component 321 is located within the orthographic projection of the reinforcing plate 70.

[0251] The reinforcing plate 70 is connected to one side of the circuit board 31 in the first direction X, and the component 321 is soldered to the side of the circuit board 31 in the first direction X away from the reinforcing plate 70. That is, the reinforcing plate 70 and the component 321 are respectively connected to the two sides of the circuit board 31 in the first direction X, and the component 321 is soldered to the circuit board 31. In other words, the component 321 is soldered to the surface of the circuit board 31 on the side away from the reinforcing plate 70 in the first direction X, so that the circuit board 31 is located between the reinforcing plate 70 and the component 321 in the first direction X.

[0252] In the projection plane perpendicular to the first direction X, the orthographic projection of component 321 is located within the orthographic projection of reinforcing plate 70. That is to say, component 321 is a structure that is integrally disposed in the area of ​​circuit board 31 that overlaps with reinforcing plate 70 in the first direction X.

[0253] In this embodiment, by connecting a reinforcing plate 70 to one side of the circuit board 31 along the first direction X, and welding a component 321 to the other side, and ensuring that the orthographic projection of the component 321 in a projection plane perpendicular to the first direction X lies within the orthographic projection of the reinforcing plate 70 in the same projection plane, the reinforcing plate 70 can support and strengthen the circuit board 31 when the component 321 is welded and assembled onto it. This improves the welding quality between the component 321 and the circuit board 31 and reduces the risk of damage to the circuit board 31. The reinforcement plate 70 reduces the risk of damage to the component 321 during the soldering process, thereby improving the assembly quality between the component 321 and the circuit board 31. On the other hand, it enables the reinforcement plate 70 to strengthen the area of ​​the circuit board 31 where the component 321 is soldered, thereby further improving the rigidity of the area of ​​the circuit board 31 where the battery monitoring component 32 is integrated. This can alleviate the vibration or shaking phenomenon in the first area 3111 of the circuit board 31 where the battery monitoring component 32 is integrated during use, thereby reducing the risk of damage to the component 321 integrated on the circuit board 31.

[0254] According to some embodiments of this application, see Figure 4 and Figure 7 As shown, the circuit board 31 includes a circuit board body 311 and at least one sampling unit 312. Multiple components 321 are disposed on the circuit board body 311. The sampling unit 312 is electrically connected to the circuit board body 311, and each sampling unit 312 is connected to a sampling point to collect the temperature signal or voltage signal of the battery cell 22.

[0255] The circuit board body 311 is the main area of ​​the circuit board 31, while the sampling section 312 is a branch line of the circuit board 31 and is used to connect with the sampling point. Multiple components 321 are disposed on the circuit board body 311, that is, the circuit board body 311 has a first area 3111 that overlaps with the first limiting part 41 of the limiting member 40 in the first direction X. Correspondingly, in the implementation where a waterproof protective layer 33 is provided on the circuit board 31, the waterproof protective layer 33 is disposed on the surface of the circuit board body 311 facing the component 321.

[0256] It should be noted that multiple wire harnesses are provided inside the circuit board body 311. One end of the wire harness is connected to the sampling unit 312, and the other end is connected to the component 321 of the battery monitoring component 32 to realize the electrical connection between the sampling unit 312 and the component 321 of the battery monitoring component 32.

[0257] As an example, the two electrode terminals 222 of the battery cell 22 are arranged at intervals along the third direction Z. Correspondingly, the circuit board body 311 is disposed in the third direction Z between the two electrode terminals 222 of the battery cell 22 of the corresponding battery cell assembly 20.

[0258] It should be noted that the sampling unit 312 can be used to collect the temperature signal of the battery cell 22. That is, the sampling unit 312 can include a first connecting line and a temperature detection element. The first connecting line is connected to the circuit board body 311 and is electrically connected to the temperature detection element. The temperature detection element is installed at the sampling point, for example, on the busbar component 21 or on the casing 221 of the battery cell 22, so that the temperature detection element can detect the temperature of the battery cell 22 to collect the temperature signal of the battery cell 22. Of course, the sampling unit 312 can also be used to collect the voltage of the battery cell 22. The signal, i.e., the sampling unit 312, may include a second connecting line. The second connecting line is connected to the circuit board body 311 and is electrically connected to the sampling point. For example, the second connecting line is electrically connected to the electrode terminal 222 of the busbar component 21 or the battery cell 22 to obtain the voltage signal of the battery cell 22. Of course, in some embodiments, the second connecting line may also be electrically connected to the electrode terminal 222 of the busbar component 21 or the battery cell 22 through a fuse device to collect the voltage signal of the battery cell 22. The specific structure of the fuse device can be found in related technologies and will not be described in detail here.

[0259] For example, in Figure 7 In the circuit board body 311, multiple sampling units 312 are connected, and some of the sampling units 312 are used to collect the temperature signal of the battery cell 22, while the other sampling units 312 are used to collect the voltage signal of the battery cell 22.

[0260] In this embodiment, the circuit board 31 includes a circuit board body 311 and at least one sampling part 312 connected to the circuit board body 311. Each sampling part 312 is connected to a sampling point so that the circuit board 31 can collect the temperature signal or voltage signal of the battery cell 22. The circuit board 31 with this structure can easily connect the circuit board 31 to multiple sampling points through multiple sampling parts 312 so that the circuit board 31 can collect the temperature signal or voltage signal of multiple sampling points. It can also reduce the connection difficulty between the circuit board 31 and the sampling points and improve the assembly flexibility of the circuit board 31.

[0261] In some embodiments, combined with Figure 4 and Figure 7As shown, in the projection plane perpendicular to the first direction X, the orthographic projection of the circuit board body 311 and the orthographic projection of the busbar component 21 are completely misaligned. That is to say, in the projection plane perpendicular to the first direction X, the orthographic projections of the circuit board body 311 and the busbar component 21 do not have overlapping areas, i.e., the orthographic projections of the circuit board body 311 and the busbar component 21 are arranged alternately.

[0262] In this embodiment, by setting the orthographic projection of the circuit board body 311 of the circuit board 31 in a projection plane perpendicular to the first direction X and the orthographic projection of the busbar component 21 in a projection plane perpendicular to the first direction X to be completely misaligned, the orthographic projection of the circuit board body 311 of the circuit board 31 in a projection plane perpendicular to the first direction X and the orthographic projection of the busbar component 21 in a projection plane perpendicular to the first direction X are structured to have non-overlapping areas. The battery device 100 with this structure can reduce the interference between the circuit board body 311 and the busbar component 21, which is beneficial to reducing the assembly difficulty of the circuit board 31 and the battery cell assembly 20. On the other hand, it can optimize the spatial layout between the circuit board body 311 and the busbar component 21, so that the circuit board body 311 and the busbar component 21 can share space in the first direction X, which is beneficial to improving the space utilization of the battery device 100.

[0263] In some embodiments, refer to Figure 7 Please refer to further details. Figure 11 As shown, Figure 11 This is a cross-sectional view of the circuit board body 311 of the circuit board 31 of the battery sampling unit 30 provided in some embodiments of this application, perpendicular to the second direction Y. The circuit board body 311 includes a circuit layer 311a and an insulating layer 311b stacked along the first direction X. There is one circuit layer 311a and two insulating layers 311b. The circuit layer 311a is disposed between the two insulating layers 311b. The components 321 and the sampling part 312 are both electrically connected to the circuit layer 311a.

[0264] The circuit board body 311 includes a circuit layer 311a and an insulating layer 311b stacked along the first direction X. That is, the circuit board body 311 is a multi-layer structure, and there is one circuit layer 311a and two insulating layers 311b in the multi-layer structure. The circuit layer 311a is a component in the circuit board body 311 used for circuit or signal transmission. Correspondingly, the circuit layer 311a is a single-layer structure composed of multiple wire bundles, while the two insulating layers 311b are structures that clamp and cover the circuit layer 311a in the first direction X.

[0265] In this embodiment, by setting the circuit board body 311 as a single-layer wire harness structure with two insulating layers 311b sandwiching a circuit layer 311a, the circuit board 31 with this structure can reduce the weight of the circuit board body 311, which is beneficial to reduce the vibration or shaking of the first area 3111 where the battery monitoring component 32 is integrated during use, thereby reducing the risk of damage to the component 321 due to collision or bump. On the other hand, the insulating layers 311b on both sides of the circuit layer 311a can not only provide insulation and isolation for the circuit layer 311a, but also provide buffer protection for the circuit layer 311a. This can reduce the risk of short circuit between the circuit layer 311a and components such as the battery cell 22 or the busbar component 21, while also reducing the risk of the circuit layer 311a being bumped or scratched during use.

[0266] According to some embodiments of this application, see Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the battery cell 22 may include a housing 221, an electrode assembly, and electrode terminals 222. The housing 221 has a wall portion 2211 facing the circuit board 31 in the first direction X. The electrode assembly is housed within the housing 221. The electrode terminals 222 are disposed on the wall portion 2211 and protrude from the surface of the wall portion 2211 facing the circuit board 31. The electrode terminals 222 are electrically connected to the electrode assembly, and the busbar component 21 is connected to the electrode terminals 222. The battery cell assembly 20 may also include an insulating member 50. At least a portion of the insulating member 50 is disposed between the battery sampling unit 30 and the housing 221 in the first direction X to insulate and isolate the battery sampling unit 30 and the housing 221.

[0267] The insulating member 50 is disposed on the side of the housing 221 facing the circuit board 31 in the first direction X, and at least a portion of the insulating member 50 is located between the battery sampling unit 30 and the housing 221, that is, the battery sampling unit 30 is located on the side of the insulating member 50 away from the housing 221 in the first direction X, so that the insulating member 50 can play the role of insulation and isolation between the battery sampling unit 30 and the housing 221.

[0268] For example, the insulating element 50 can be made of various materials, such as rubber, plastic or silicone.

[0269] In this embodiment, the battery cell assembly 20 is also provided with an insulating member 50. By setting at least a portion of the insulating member 50 to be located between the battery sampling unit 30 and the housing 221 in the first direction X, the insulating member 50 can insulate and isolate the battery sampling unit 30 and the housing 221, which helps to reduce the risk of short circuit between the battery sampling unit 30 and the housing 221, thereby improving the reliability of the battery device 100.

[0270] According to some embodiments of this application, see Figure 3 and Figure 4 As shown, along the first direction X, the busbar 21 is located on the side of the insulating member 50 away from the outer casing 221. That is, the busbar 21 and the battery sampling unit 30 are located on the same side of the insulating member 50 in the first direction X, and the busbar 21 and the outer casing 221 are located on opposite sides of the insulating member 50 in the first direction X.

[0271] In this embodiment, by setting the busbar 21 on the side of the insulating member 50 away from the outer casing 221 in the first direction X, the busbar 21 and the outer casing 221 are respectively located on both sides of the insulating member 50 in the first direction X. This allows the insulating member 50 to also serve to insulate and isolate the busbar 21 and the outer casing 221, which helps to reduce the risk of short circuit between the busbar 21 and the outer casing 221, thereby further improving the reliability of the battery device 100.

[0272] In some embodiments, combined with Figure 4 and Figure 5 As shown, the insulating member 50 is provided with at least one second clearance hole 51, which penetrates the insulating member 50 along the first direction X, and the second clearance hole 51 corresponds one-to-one with the electrode terminal 222. Along the first direction X, the electrode terminal 222 passes through the second clearance hole 51 and is connected to the busbar member 21.

[0273] The structure in which the second clearance hole 51 is provided in a one-to-one correspondence with the electrode terminal 222, with each electrode terminal 222 passing through a second clearance hole 51, and one end of the electrode terminal 222 passing through the second clearance hole 51 in the first direction X being connected to the busbar component 21.

[0274] In this embodiment, by providing a second clearance hole 51 in the area corresponding to the electrode terminal 222 on the insulating member 50, the second clearance hole 51 is a structure that penetrates the insulating member 50 along the first direction X, and the electrode terminal 222 is a structure that passes through the second clearance hole 51 along the first direction X and is connected to the busbar component 21 located on the side of the insulating member 50 away from the outer shell 221, the assembly difficulty between the busbar component 21 and the electrode terminal 222 of the battery cell 22 can be reduced while achieving insulation isolation between the insulating member 50 and the busbar component 21 and the outer shell 221, thereby reducing the overall assembly difficulty of the battery device 100.

[0275] According to some embodiments of this application, this application also provides an electrical device, which includes a battery device 100 of any of the above schemes, and the battery device 100 is used to provide electrical energy to the electrical device.

[0276] The electrical device can be any of the aforementioned devices or systems that utilize battery device 100.

[0277] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0278] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: A battery cell assembly includes a busbar and a plurality of battery cells. The busbar is located on one side of the battery cells in a first direction. The busbar is electrically connected to at least two of the battery cells. At least one of the busbar and / or at least one of the battery cells is provided with a sampling point. Battery management system; A battery sampling unit includes a circuit board and a battery monitoring component. The circuit board is disposed on one side of a plurality of battery cells in the first direction and is connected to the sampling point to collect temperature signals and / or voltage signals of the battery cells. The battery monitoring component includes a plurality of components disposed on the circuit board and electrically connected to the circuit board. The plurality of components include at least one analog front end. The analog front end is communicatively connected to the battery management system and is configured to convert the temperature signals and / or voltage signals collected by the circuit board into digital signals and transmit them to the battery management system. as well as A limiting member is fixed to the battery cell assembly, the limiting member including a first limiting portion located on the side of the circuit board opposite to the battery cell in the first direction; Along the first direction, the circuit board has a first region that overlaps with the first limiting portion, and at least a portion of at least one of the components is disposed within the first region.

2. The battery device according to claim 1, characterized in that, The limiting component also includes: The second limiting part is connected to the first limiting part, and the second limiting part is fixed to the battery cell assembly; Specifically, in the projection plane perpendicular to the first direction, the orthographic projection of the second limiting part and the orthographic projection of the circuit board are completely misaligned.

3. The battery device according to claim 2, characterized in that, The battery cell includes a housing, the housing having a wall facing the circuit board in the first direction; The limiting member is bent to form a bent portion, and each second limiting portion is connected to the first limiting portion through one of the bent portions. Along the first direction, the second limiting portion is closer to the wall portion than the first limiting portion.

4. The battery device according to claim 2, characterized in that, The limiting component includes: Multiple second limiting portions are connected to the first limiting portion, and each second limiting portion is fixed to the battery cell assembly.

5. The battery device according to claim 4, characterized in that, The battery cell assembly includes at least one row of battery cells, each row of battery cells includes a plurality of battery cells stacked along a second direction, the circuit board extends along the second direction, and the circuit board is provided with the busbar on both sides of a third direction, the first direction, the second direction and the third direction are perpendicular to each other; Along the third direction, both ends of the first limiting part are connected to the second limiting part.

6. The battery device according to claim 2, characterized in that, The second limiting part is fixed to the busbar component.

7. The battery device according to claim 6, characterized in that, Along the first direction, at least a portion of the second limiting portion is located on the side of the busbar component facing the battery cell.

8. The battery device according to claim 7, characterized in that, The battery cell includes a housing, an electrode assembly, and electrode terminals. The housing has a wall facing the circuit board in the first direction. The electrode assembly is housed within the housing. The electrode terminals are disposed on the wall and protrude from the surface of the wall facing the circuit board, and the electrode terminals are electrically connected to the electrode assembly. In this configuration, along the first direction, the busbar is connected to the electrode terminal, and at least a portion of the second limiting portion is located between the busbar and the wall portion.

9. The battery device according to claim 7, characterized in that, The busbar component is provided with a first positioning hole, and the second limiting part is provided with a second positioning hole; Along the first direction, the second positioning hole on the second limiting part is disposed opposite to the first positioning hole on the corresponding busbar component.

10. The battery device according to claim 6, characterized in that, The battery device also includes: The first adhesive component bonds the second limiting portion and the busbar component.

11. The battery device according to claim 2, characterized in that, The second limiting part is fixed to the battery cell.

12. The battery device according to claim 11, characterized in that, The battery device also includes: The second adhesive component bonds the second limiting portion and the battery cell.

13. The battery device according to claim 2, characterized in that, The battery cell assembly further includes an insulating member, at least a portion of which is disposed between the battery sampling unit and the battery cell in the first direction; The second limiting part is fixed to the insulating member.

14. The battery device according to claim 13, characterized in that, The battery device also includes: A connector is used to rivet the second limiting part and the insulating part together.

15. The battery device according to any one of claims 1-14, characterized in that, The battery cell includes a housing, the housing having a wall facing the circuit board in the first direction; The battery cell further includes a pressure relief component, which is disposed on the wall portion. The first limiting portion has a first clearance hole in the area corresponding to the pressure relief component in the first direction, and the first clearance hole penetrates the first limiting portion along the first direction.

16. The battery device according to any one of claims 1-14, characterized in that, The limiting component is made of insulating material.

17. The battery device according to any one of claims 1-14, characterized in that, The battery device also includes: A buffer is disposed, at least partially, between the first limiting portion and the circuit board in the first direction.

18. The battery device according to any one of claims 1-14, characterized in that, Along the first direction, a plurality of the components are disposed on the side of the circuit board facing the battery cell.

19. The battery device according to any one of claims 1-14, characterized in that, The circuit board has a waterproof protective layer on its surface, and the waterproof protective layer covers multiple components.

20. The battery device according to any one of claims 1-14, characterized in that, The battery device also includes: A reinforcing plate is connected to the circuit board, and the reinforcing plate and the component are respectively disposed on both sides of the circuit board in the first direction; Wherein, in a projection plane perpendicular to the first direction, at least a portion of the orthographic projection of at least one of the components lies within the orthographic projection of the reinforcing plate.

21. The battery device according to claim 20, characterized in that, Along the first direction, the thickness of the reinforcing plate is 0.2mm-1mm.

22. The battery device according to claim 20, characterized in that, The battery device also includes: The third adhesive component bonds the reinforcing plate and the circuit board.

23. The battery device according to any one of claims 1-14, characterized in that, The circuit board is a flexible circuit board.

24. The battery device according to claim 23, characterized in that, The battery device also includes: A reinforcing plate is connected to one side of the circuit board in the first direction, and the component is soldered to the side of the circuit board opposite to the reinforcing plate in the first direction; Specifically, in a projection plane perpendicular to the first direction, the orthographic projection of the component is located within the orthographic projection of the reinforcing plate.

25. The battery device according to any one of claims 1-14, characterized in that, The circuit board includes a circuit board body and at least one sampling unit. Multiple components are disposed on the circuit board body. The sampling unit is electrically connected to the circuit board body, and each sampling unit is connected to a sampling point to collect the temperature signal or voltage signal of the battery cell.

26. The battery device according to claim 25, characterized in that, In a projection plane perpendicular to the first direction, the orthographic projection of the circuit board body and the orthographic projection of the busbar are completely misaligned.

27. The battery device according to claim 26, characterized in that, The circuit board body includes a circuit layer and an insulating layer stacked along the first direction. There is one circuit layer and two insulating layers. The circuit layer is disposed between the two insulating layers. The components and the sampling unit are electrically connected to the circuit layer.

28. The battery device according to any one of claims 1-14, characterized in that, The battery cell includes a housing and an electrode assembly, the electrode assembly being housed within the housing; The battery cell assembly further includes an insulating component, at least a portion of which is disposed between the battery sampling unit and the housing in the first direction to insulate and isolate the battery sampling unit and the housing.

29. The battery device according to claim 28, characterized in that, Along the first direction, the busbar is located on the side of the insulator opposite to the housing.

30. The battery device according to claim 29, characterized in that, The housing has a wall facing the circuit board in the first direction. The battery cell also includes an electrode terminal, which is disposed on the wall and protrudes from the surface of the wall facing the circuit board. The electrode terminal is electrically connected to the electrode assembly, and the busbar is connected to the electrode terminal. The insulating component is provided with at least one second clearance hole, which penetrates the insulating component along the first direction and corresponds one-to-one with the electrode terminal. Along the first direction, the electrode terminal passes through the second clearance hole and is connected to the busbar component.

31. An electrical device, characterized in that, Includes a battery device as described in any one of claims 1-30, the battery device being used to provide electrical energy.

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