A battery connection assembly, a battery pack and a vehicle

Abstract

The application provides a battery connection assembly, a battery pack and a vehicle. The battery connection assembly comprises a circuit board, a busbar and a hot-pressing film. The circuit board comprises a flexible flat cable and a flexible die-cut circuit board connected to at least one side of the flexible flat cable along the width direction of the flexible flat cable, and the flexible die-cut circuit board is connected to the busbar. The hot-pressing film covers the circuit board and the busbar to fix the circuit board and the busbar. Compared with the traditional method, the process of the circuit board and the hot-pressing film is simple and the cost is low, thereby helping to reduce the preparation difficulty of the battery connection assembly and save the preparation cost. In addition, the thickness of the hot-pressing film is relatively thin, and the space occupied in the height direction of the battery pack is relatively small, which is more conducive to the installation and layout of the battery connection assembly in the battery pack. In addition, the weight of the hot-pressing film is lighter, and the strength performance and pressure resistance performance are more excellent, which helps to reduce the weight of the battery connection assembly and improve the connection effect of the battery connection assembly.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and in particular to a battery connection assembly, a battery pack, and a vehicle. Background Technology

[0002] The Cells Contact System (CCS) is a crucial component within the battery pack. It enables series and parallel connections between multiple cells, collects cell temperature and voltage data, monitors cell status, and provides balancing circuitry to ensure the safe and stable operation of the battery pack.

[0003] In the prior art, battery connection components typically use blister trays and flexible printed circuit boards (FPCs). The processes for blister trays and flexible printed circuit boards are complex and the processing costs are high, which makes it difficult and costly to manufacture battery connection components. In addition, the thickness of the blister trays is relatively large, occupying a large amount of space in the height direction of the battery pack, which is not conducive to the installation and layout of battery connection components in the battery pack. Summary of the Invention

[0004] In view of this, this application provides a battery connection component, a battery pack, and a vehicle to at least solve the problems of high manufacturing difficulty, high cost, and inconvenience in installation and deployment of battery connection components in the prior art.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] This application provides a battery connection assembly, including a circuit board, a busbar, and a heat-pressing film; the circuit board includes a flexible flat cable and a flexible die-cut circuit board, the flexible die-cut circuit board being connected to at least one side of the flexible flat cable along its width direction, and the flexible die-cut circuit board being connected to the busbar; the heat-pressing film covers the circuit board and the busbar to fix the circuit board and the busbar.

[0007] Optionally, the bus includes an upper surface and a lower surface, the upper surface and the lower surface being disposed opposite to each other along the thickness direction of the bus; the portion of the lower surface covered by the hot-pressing film is connected to the flexible die-cut circuit board, and the other portion of the lower surface not covered by the hot-pressing film is adapted to be connected to the battery cell.

[0008] Optionally, the lower surface is provided with a first welding part and a second welding part, the first welding part being welded to the flexible die-cut circuit board, and the second welding part being adapted to be welded to the battery cell; wherein, the first welding part is disposed on the periphery of the second welding part.

[0009] Optionally, the hot-pressed film is a PI film or a PET film, and / or the hot-pressed film is a single-sided hot-pressed film.

[0010] Optionally, the flexible flat cable is manufactured by roller die cutting, and the flexible die-cut circuit board is manufactured by stamping die cutting.

[0011] Optionally, the flexible flat cable is composed of copper wires wrapped with at least two layers of PI film; and / or, the flexible die-cut circuit board is composed of copper wires wrapped with at least two layers of PI film.

[0012] Optionally, the hot-pressed film has a perforated portion, which is adapted for devices connected to the battery cell to pass through.

[0013] Optionally, the cutout portion is strip-shaped, and the extension direction of the cutout portion is in the same direction as the length direction of the flexible flat cable; and / or, there are at least two cutout portions, and at least two cutout portions are arranged side by side.

[0014] This application also provides a battery pack including a plurality of battery cells and a battery connection assembly as described in any of the preceding claims, wherein the busbar is connected to the plurality of battery cells.

[0015] This application also provides a vehicle including the aforementioned battery pack.

[0016] Compared to existing technologies, the battery connection assembly, battery pack, and vehicle described in this application have the following advantages:

[0017] In the battery connection assembly of this application, the circuit board adopts FFC and FDC, and the circuit board and bus are covered by a hot-pressed film to fix the circuit board and bus. Compared with the traditional method of using a blister tray and FPC, this simplifies the processing technology and saves processing costs, thereby helping to reduce the manufacturing difficulty and cost of the battery connection assembly. In addition, the hot-pressed film is thinner and occupies less space in the height direction of the battery pack, which is more conducive to the installation and layout of the battery connection assembly in the battery pack. Furthermore, the hot-pressed film is lighter and has better strength and pressure resistance, which helps to reduce the weight of the battery connection assembly and improve the connection effect, thus facilitating the lightweight design of the battery pack.

[0018] The battery pack and vehicle of this application have the same or similar advantages over the prior art and the aforementioned battery connection components, which will not be elaborated here. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1This is a partial schematic diagram of a battery connection assembly according to an embodiment of this application;

[0021] Figure 2 This is a partial top view of a battery connection assembly according to an embodiment of this application;

[0022] Figure 3 This is a partial bottom view of a battery connection assembly according to an embodiment of this application;

[0023] Figure 4 This is a partial side view of a battery connection assembly according to an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1-Circuit board, 11-Flexible flat cable, 12-Flexible die-cut circuit board, 2-Busbar, 21-Upper surface, 22-Lower surface, 3-Hot-press film, 30-Kuzzle section, 4-Temperature acquisition device. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely 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.

[0027] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0028] The terms "comprising," "including," or any other variations thereof used in the specification and claims of this application are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0029] The following detailed description of a battery connection component, battery pack, and vehicle provided in this application is illustrated with specific embodiments.

[0030] Figure 1 A partial schematic diagram of a battery connection assembly is shown, with reference to... Figure 1 This application provides a battery connection assembly, which includes a circuit board 1, a busbar 2, and a hot-press film 3. The circuit board 1 includes a flexible flat cable 11 and a flexible die-cut circuit board 12. The flexible die-cut circuit board 12 is connected to at least one side of the flexible flat cable 11 along its width direction and is connected to the busbar 2. The hot-press film 3 covers the circuit board 1 and the busbar 2 to fix the circuit board 1 and the busbar 2.

[0031] Specifically, the battery connection assembly includes a circuit board 1, a busbar 2, and a thermoplastic film 3. The busbar 2 connects to multiple cells within the battery pack, allowing these cells to be connected in series or parallel to form a battery pack. This battery pack is used to enable the charging and discharging functions of the battery pack. The busbar 2 can be made of copper, aluminum, nickel, etc., all of which possess good conductivity and can effectively achieve the series and parallel connection of multiple cells. The circuit board 1, connected to the busbar 2, can collect parameters such as voltage, current, and temperature from the busbar 2 and transmit this information to the battery management system (BMS). The BMS monitors the voltage, current, and temperature of the multiple cells based on the collected parameters. In cases of excessive voltage or current, or excessively high temperature, it cuts off the charging and discharging circuit, thereby preventing overvoltage, overcurrent, or even thermal runaway in the cells and improving the safety of the battery pack.

[0032] In traditional battery connection assemblies, circuit board 1 is a flexible circuit board, referred to hereafter as FPC. FPC uses polyimide or polyester film as the substrate, copper foil as the conductor layer, and the two are tightly bonded together with an adhesive, then covered with a protective film and a reinforcing plate. The FPC production process includes design, material preparation, photolithography, etching, lamination, drilling, and surface treatment. Overall, the processing technology of FPC is complex and the processing cost is high, resulting in greater difficulty and higher manufacturing costs for battery connection assemblies.

[0033] In the battery connection assembly of this application embodiment, circuit board 1 includes a flexible flat cable 11 (FFC) and a flexible die-cutting circuit 12 (FDC), which will be described below as FFC and FDC respectively. FFC11 is made by pressing together multiple strands of copper wires wrapped with insulating material, and has a flat structure. Its processing technology is relatively simple, mainly made by pressing and die-cutting. The mold is highly versatile, and local adjustments do not incur mold costs. FDC12 also uses polyimide or polyester film as the substrate, but is made by stamping and die-cutting. Its processing steps are relatively few, the process is environmentally friendly, the processing cycle is short, and the efficiency is high. Overall, compared with FPC, FFC11 and FDC12 have relatively fewer processing steps, the processing technology is simplified, and the processing cost is reduced, thereby helping to reduce the difficulty of manufacturing the battery connection assembly and save manufacturing costs.

[0034] In the case where circuit board 1 includes FFC11 and FDC12, FFC11 has an elongated structure, and FDC12 is connected to at least one side of FFC11 along its width direction. FDC12 is connected to bus 2. Specifically, the connection of FDC12 depends on the position of bus 2. If bus 2 is located on one side of FFC11, then FDC12 is connected to one side of FFC11 along its width direction; if bus 2 is located on both sides of FFC11, then FDC12 is connected to both sides of FFC11 along its width direction. Thus, through the connection between FDC12 and bus 2, communication between circuit board 1 and bus 2 is realized, enabling circuit board 1 to collect parameters such as voltage, current, and temperature on bus 2 and transmit the parameter information to the battery management system.

[0035] For fixing circuit board 1 and busbar 2, traditional battery connection assemblies typically use a blister tray to fix circuit board 1 and busbar 2. The forming of the blister tray involves multiple steps such as pretreatment, mold making, blister forming, cleaning, and deburring. Its processing technology is complex and the processing cost is high, which leads to the difficulty and high cost of manufacturing battery connection assemblies. In addition, the thickness of the blister tray is relatively large, occupying a large space in the height direction of the battery pack, which is not conducive to the installation and layout of the battery connection assembly in the battery pack.

[0036] In the battery connection assembly of this application embodiment, a hot-pressing film 3 is used to cover the circuit board 1 and the busbar 2 to fix the circuit board 1 and the busbar 2. The hot-pressing film 3 is usually composed of two or more layers of materials, such as fibers, polymers, and aluminum foil, which are bonded together by high-temperature hot pressing technology to form a thin film with specific properties and uses. The processing technology of the hot-pressing film 3 mainly includes hot pressing molding and post-processing steps. Compared with the traditional processing technology of blister trays, the processing technology of the hot-pressing film 3 is simpler and does not require the manufacture of molds, which greatly saves processing costs, thereby helping to reduce the difficulty of manufacturing the battery connection assembly and save manufacturing costs. In addition, the hot-pressing film 3 is usually a thin film with a relatively thin thickness, occupying less space in the height direction of the battery pack, which is beneficial for the installation and layout of the battery connection assembly in the battery pack. In addition, the busbar 2 and the circuit board 1 are fixed by the adhesive of the hot-pressing film, which can effectively achieve electrical insulation between the busbar 2 and the circuit board 1 and other components, and also helps to improve the connection strength between the FDC12 and the busbar 2, and improve the mechanical properties of the connection part.

[0037] Optionally, in some embodiments of this application, the hot-pressed film 3 may be a PI (polyimide) film or a PET (polyethylene terephthalate) film. The PI film or PET film has good insulation, high temperature resistance, corrosion resistance and certain mechanical strength, which can meet the complex working environment and usage requirements inside the battery pack, and play a stable and reliable covering role for the circuit board 1 and the busbar 2.

[0038] Optionally, in some embodiments of this application, the hot-pressing film 3 is a single-sided hot-pressing film. A single-sided hot-pressing film only has one side capable of hot-press sealing, while the other side lacks this capability or has a poorer hot-press sealing effect. Since the hot-pressing film 3 fixes the circuit board 1 in a single-sided manner, that is, by connecting to the bottom surface of the circuit board 1 near the battery cell, the hot-pressing film 3 is a single-sided hot-pressing film. The surface of the single-sided hot-pressing film with the hot-press sealing capability is pressed and connected to the circuit board 1 and the busbar 2. The processing technology of the single-sided hot-pressing film is relatively simple, the cost is lower, and it is more helpful in controlling the manufacturing cost of the battery connection components.

[0039] Of course, in some preferred embodiments, the hot-pressed film 3 is made of PI film or PET film, and a single-sided hot-pressed film is used. While ensuring the reliable coating capability of the hot-pressed film 3, the processing cost of the hot-pressed film 3 is controlled, thereby further saving the manufacturing cost of the battery connection component.

[0040] Therefore, in the battery connection assembly of this application embodiment, the circuit board 1 uses FFC11 and FDC12, and the hot-press film 3 covers the circuit board 1 and busbar 2 to fix the circuit board 1 and busbar 2. Compared with the traditional method of using a blister tray and FPC, the processing technology is simplified and the processing cost is saved, thereby helping to reduce the manufacturing difficulty of the battery connection assembly and save manufacturing costs. In addition, the hot-press film 3 is thinner and occupies less space in the height direction of the battery pack, which is more conducive to the installation and layout of the battery connection assembly in the battery pack. In addition, the hot-press film 3 is lighter and has better strength and pressure resistance, which helps to reduce the weight of the battery connection assembly and improve the connection effect of the battery connection assembly, thereby facilitating the lightweight design of the battery pack.

[0041] Optionally, Figure 2 A partial top view of a battery connection assembly is shown. Figure 3 A partial bottom view of a battery connection assembly is shown. Figure 3 A partial side view of a battery connection assembly is shown, with reference to... Figures 2 to 4 In some embodiments of this application, the busbar 2 includes an upper surface 21 and a lower surface 22, which are disposed opposite to each other along the thickness direction of the busbar 2; a hot-pressing film 3 covers a portion of the lower surface 22, the portion of the lower surface 22 not covered by the hot-pressing film 3 is connected to the FDC12, and the other portion of the lower surface 22 not covered by the hot-pressing film 3 is adapted to be connected to the battery cell.

[0042] Specifically, the upper surface 21 of bus 2 refers to the surface of bus 2 facing away from the battery cell, and the lower surface 22 of bus 2 refers to the surface of bus 2 close to the battery cell. The heat-sealing film 3 covers a portion of the lower surface 22, while the upper surface 21 is exposed relative to the heat-sealing film 3. Since the lower surface 22 of bus 2 needs to connect with FDC12 and the battery cell to allow current flow, and the heat-sealing film 3 is insulating, it can only cover a portion of the lower surface 22 of bus 2, leaving the other portion exposed to connect FDC12 and the battery cell. Thus, the portion of the lower surface 22 of bus 2 not covered by the heat-sealing film 3 is connected to FDC12, and the other portion is connected to the battery cell. This achieves the connection of bus 2 to both the battery cell and circuit board 1, allowing circuit board 1 to collect information such as voltage, current, and temperature of the battery cell through bus 2 to monitor the charging and discharging process of the battery cell and prevent thermal runaway.

[0043] Since the FDC12 is relatively small in size, the area of ​​the busbar 2 required for connection is small. Therefore, in this embodiment, the area of ​​the lower surface 22 of the busbar 2 connected to the battery cell is larger than the area of ​​the lower surface 22 connected to the FDC12, so as to ensure a reliable connection between the busbar 2 and the battery cell, while also satisfying the effective connection between the busbar 2 and the FDC12.

[0044] Optionally, in some embodiments of this application, the lower surface 22 is provided with a first welding portion and a second welding portion, the first welding portion being welded to the FDC12, and the second welding portion being adapted to be welded to the battery cell; wherein, the first welding portion is disposed on the periphery of the second welding portion.

[0045] Specifically, the lower surface 22 of the busbar 2 is connected to the battery cell and FDC12 by laser welding. The lower surface 22 is provided with a first welding part and a second welding part. The first welding part and the second welding part are different parts of the lower surface 22. The first welding part and the second welding part can be distinguished on the lower surface 22 of the busbar 2 by color, pattern or other means, so as to accurately locate the welding position during welding and ensure the welding effect.

[0046] The first welding portion is disposed around the periphery of the second welding portion. Specifically, the first welding portion may be disposed on one side of the second welding portion along its width direction, wherein the width direction of the second welding portion is consistent with the width direction of the busbar 2. Since the circuit board 1 is distributed on one side of the busbar 2 along its width direction, distributing the first welding portion on one side of the second welding portion along its width direction helps to reduce the processing difficulty of the busbar 2 and control the processing cost of the busbar 2 while satisfying the welding requirements of the first welding portion and the FDC12.

[0047] Optionally, in some embodiments of this application, the battery connection assembly further includes a temperature acquisition device 4, which is connected to the FFC11. The temperature acquisition device 4 is adapted to connect to the battery cell and acquire the temperature of the battery cell. The temperature acquisition device 4 can be an NTC (Negative Temperature Coefficient) thermistor. The resistance of an NTC thermistor decreases as the temperature increases, thus it can be used for temperature measurement, temperature compensation, and temperature control. The NTC thermistor is fixed to the top cover of the battery cell by a bracket and can acquire the temperature of the battery cell. The electrical contacts of the NTC thermistor are connected to the FFC11, so the acquired temperature of the battery cell can be fed back to the FFC11. The battery management system can then obtain the temperature of the battery cell through the FFC11. Under the protection of the hot-pressing film 3, the temperature information acquired by the NTC thermistor can be made more reliable, thereby helping to improve the safety performance of the battery pack.

[0048] Optionally, in some embodiments of this application, FFC11 is composed of copper wires wrapped with at least two layers of PI film; and / or, FDC12 is composed of copper wires wrapped with at least two layers of PI film. Exemplarily, FFC11 and FDC12 are respectively composed of upper and lower PI films, ADH (adipic acid dihydrazide) adhesive, and copper wires. The main components of ADH adhesive are acrylate and polymer emulsion, typically a mixture of acrylic acid, acrylate, polymer emulsion, and other additives. ADH adhesive has high bonding strength, low curing time and shrinkage, and high anti-aging properties, and can reliably bond various materials, maintaining the dimensional stability, accuracy, and bonding strength of the bonded area. By bonding the upper and lower PI films to the copper wires using ADH adhesive, the upper and lower PI films wrap around the copper wires, thereby forming FFC11 or FDC12.

[0049] Optionally, refer to Figure 2 and Figure 3 In some embodiments of this application, the hot-press film 3 has a perforated portion 30, which is suitable for a device connected to the battery cell to pass through. The device for connecting the battery cell can be a battery cell clamping strip, which is used to constrain and fix each battery cell. The clamping strip is typically strip-shaped or U-shaped, ensuring a tight connection between the cells and preventing displacement under vibration or external force, thus improving the stability and safety of the battery pack. The clamping strip is usually made of steel, aluminum alloy, composite materials, etc., possessing sufficient strength and durability. It should be noted that the clamping strip is typically connected to the battery cell via structural adhesive, and the perforated portion 30 provides space for the structural adhesive (such as polyurethane adhesive). Of course, the devices that connect the battery cells can also be other components, such as some control devices (relays, sensors, fuses) in the battery management system. The hollow part 30 can prevent the hot-pressing film 3 from interfering with the devices on the battery cell cover, making it easier to install and lay out the battery connection assembly. At the same time, the hollow part 30 can also help control the material cost of the hot-pressing film 3, thereby reducing the manufacturing cost of the battery connection assembly.

[0050] Optionally, refer to Figure 2 and Figure 3 In some embodiments of this application, the cutout portion 30 is strip-shaped, the extension direction of the cutout portion 30 is in the same direction as the length direction of FFC11, and / or, there are at least two cutout portions 30, and at least two cutout portions 30 are arranged side by side.

[0051] Specifically, for most battery packs, the cell retaining strip is a strip-shaped structure. Therefore, the cutout portion 30 is also strip-shaped, with a shape similar to that of FFC11 and adapted to the shape of the cell retaining strip. This better facilitates a full connection between the cell retaining strip and the cell, improving the retaining strip's constraint and fixation effect on the cell. Alternatively, there can be at least two cutout portions 30. Where the required length of the cutout portion 30 is long, it can be designed as a segmented structure, i.e., two or more cutout portions 30 are arranged side-by-side on the hot-press film 3 to reduce the impact on the structural stability of the hot-press film 3, thereby reducing the impact of the hot-press film 3 on the circuit board 1 and busbar 2. Of course, there can be two or more cutout portions 30, and each cutout portion 30 can be strip-shaped to fully utilize the aforementioned advantages.

[0052] This application also provides a battery pack, including multiple battery cells and a battery connection assembly as described above, with a busbar 2 connected to the multiple battery cells. The multiple battery cells are connected in series or parallel through the busbar 2 in the battery connection assembly to form a battery pack, which is used to realize the charging and discharging function of the battery pack. The battery connection assembly is easy to manufacture, lightweight, low-cost, and occupies less space in the height direction of the battery pack, which is more conducive to the optimization and improvement of the internal structure of the battery pack and lightweight design.

[0053] This application also provides a vehicle including the aforementioned battery pack. The vehicle can be a pure electric vehicle or a hybrid vehicle. As the primary power source for the vehicle, the performance of the battery pack has a crucial impact on the vehicle's range, driving performance, and safety performance. The vehicle in this application uses a compact and lightweight battery pack, which helps to reduce the overall vehicle weight and facilitates the installation and layout of other vehicle components.

[0054] It should be understood that the phrase "some embodiments" throughout the specification means that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "some embodiments" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. 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 connection assembly, characterized in that, Includes circuit board (1), busbar (2) and hot-press film (3); The circuit board (1) includes a flexible flat cable (11) and a flexible die-cut circuit board (12), the flexible die-cut circuit board (12) being connected to at least one side of the flexible flat cable (11) along its width direction, and the flexible die-cut circuit board (12) being connected to the bus (2); The hot-press film (3) covers the circuit board (1) and the busbar (2) to fix the circuit board (1) and the busbar (2).

2. The battery connection assembly according to claim 1, characterized in that, The busbar (2) includes an upper surface (21) and a lower surface (22), which are arranged opposite to each other along the thickness direction of the busbar (2); The hot-press film (3) covers a portion of the lower surface (22), the portion of the lower surface (22) not covered by the hot-press film (3) is connected to the flexible die-cut circuit board (12), and the other portion of the lower surface (22) not covered by the hot-press film (3) is adapted to be connected to the battery cell.

3. The battery connection assembly according to claim 2, characterized in that, The lower surface (22) is provided with a first welding part and a second welding part. The first welding part is welded to the flexible die-cut circuit board (12), and the second welding part is suitable for welding to the battery cell. The first welding part is disposed on the periphery of the second welding part.

4. The battery connection assembly according to any one of claims 1 to 3, characterized in that, The hot-pressed film (3) is a PI film or a PET film, and / or the hot-pressed film (3) is a single-sided hot-pressed film.

5. The battery connection assembly according to any one of claims 1 to 3, characterized in that, The flexible flat cable (11) is made by roller die cutting, and the flexible die-cut circuit board (12) is made by stamping die cutting.

6. The battery connection assembly according to any one of claims 1 to 3, characterized in that, The flexible flat cable (11) is composed of copper wires wrapped with at least two layers of PI film; and / or, the flexible die-cut circuit board (12) is composed of copper wires wrapped with at least two layers of PI film.

7. The battery connection assembly according to any one of claims 1 to 3, characterized in that, The hot-pressed film (3) has a perforated portion (30) which is adapted to allow devices connected to the battery cell to pass through.

8. The battery connection assembly according to any one of claims 7, characterized in that, The hollow part (30) is strip-shaped, and the extension direction of the hollow part (30) is in the same direction as the length direction of the flexible flat cable (11); And / or, there are at least two hollowed-out portions (30), and at least two hollowed-out portions (30) are arranged side by side.

9. A battery pack, characterized in that, It includes a plurality of battery cells and a battery connection assembly as described in any one of claims 1 to 8, wherein the bus (2) is connected to the plurality of battery cells.

10. A vehicle, characterized in that, Includes the battery pack as described in claim 9.

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