Battery connection system, battery module, battery pack and vehicle

Abstract

The utility model discloses a battery connection system, a battery module, a battery pack and a vehicle, the battery connection system is a single-side film structure, and comprises an insulating film, a busbar and a flexible connecting piece; the busbar is positioned on one side, facing the battery cell pole, of the insulating film, and the busbar is connected with the insulating film; the flexible connecting piece is positioned on one side, facing the battery cell pole, of the insulating film, and the flexible connecting piece is connected with the insulating film; and the busbar is electrically connected with the flexible connecting piece. The structural design of the battery connection system is beneficial to weight reduction and thickness reduction.

Description

Technical Field

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

[0002] The battery pack is equipped with a Cells Contact System (CCS). The CCS combines wiring harnesses, wiring harness isolation plates, busbars, and temperature terminals together by means of welding or other methods to realize the series or parallel connection of multiple cells and to collect temperature and voltage data of the cells.

[0003] In related technologies, CCS includes components such as a blister tray, aluminum busbar, FPC (Flexible Printed Circuit), and temperature terminals. The aluminum busbar, FPC, and temperature terminals are assembled on the blister tray. The manufacturing processes for both the blister tray and the FPC are relatively complex, and the blister tray is quite thick. With the trend of continuously increasing voltage platforms and battery energy, CCS occupies a large Z-axis (height direction) space, resulting in a higher overall cost. Utility Model Content

[0004] The purpose of this application is to provide a battery connection system, a battery module, a battery pack, and a vehicle, wherein the structural design of the battery connection system is conducive to weight reduction and thickness reduction.

[0005] To address the aforementioned technical problems, this application provides a battery connection system, which is a single-sided membrane structure and includes an insulating film, a busbar, and a flexible connector.

[0006] The busbar is located on the side of the insulating film facing the cell terminal, and the busbar is connected to the insulating film;

[0007] The flexible connector is located on the side of the insulating film facing the cell electrode post, and the flexible connector is connected to the insulating film;

[0008] The busbar and the flexible connector are electrically connected.

[0009] In one feasible embodiment, the flexible connector includes a flexible flat cable and a flexible die-cut circuit board, and the busbar is electrically connected to the flexible flat cable through the flexible die-cut circuit board.

[0010] In one feasible embodiment, the flexible die-cut circuit board has a sampling terminal electrically connected to the busbar, the sampling terminal being located between the busbar and the insulating film.

[0011] In one feasible solution, the battery connection system further includes a temperature sensing component, which includes a temperature sensing bracket and a temperature sensing element. The temperature sensing element is mounted on the temperature sensing bracket, and the temperature sensing bracket is located on the side of the insulating film facing the cell terminal and is connected to the insulating film.

[0012] In one possible solution, a portion of the temperature measuring bracket overlaps with the busbar and is located on the side of the busbar facing the cell terminal.

[0013] In one feasible embodiment, the temperature measuring bracket is equipped with a thermally conductive pad, the thermally conductive pad is thermally connected to the temperature measuring element, the insulating film has an observation hole, and at least a portion of the thermally conductive pad is exposed through the observation hole.

[0014] In one feasible embodiment, the insulating film has through holes, the busbar has a connection area for connection with the battery cell, and the projection of the through holes at least partially coincides with the projection of the connection area in a plane perpendicular to the thickness direction of the battery connection system.

[0015] In one feasible embodiment, the insulating film has an adhesive backing layer on the side facing the busbar.

[0016] This application embodiment also provides a battery module, including multiple battery cells and the battery connection system described in any of the above claims, wherein the battery cells are located on the side of the busbar facing away from the insulating film, and the busbar is electrically connected to the terminals of the battery cells.

[0017] This application also provides a battery pack, including a battery box, in which the battery module described above is installed.

[0018] This application also provides a vehicle including the battery pack described above.

[0019] The battery connection system provided in this application embodiment constitutes a battery module, which in turn constitutes a battery pack. This battery connection system features a single-sided membrane structure, meaning an insulating membrane is only placed above the busbar and flexible connector, integrating the busbar and flexible connector through the insulating membrane. The battery connection system uses an insulating membrane instead of a traditional blister tray, and positions the insulating membrane on the side of the busbar and flexible connector furthest from the cell terminals. This provides better insulation, lower material costs, reduces the weight of the battery connection system, and the small thickness of the insulating membrane effectively reduces the overall thickness of the battery connection system, which is beneficial for the development and widespread adoption of higher voltage platform, larger capacity battery technology. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the battery module provided in one embodiment of this application;

[0021] Figure 2 This is a structural diagram of the battery connection system provided in one embodiment of this application;

[0022] Figure 3 for Figure 2 A structural diagram of the battery connection system from another perspective;

[0023] Figure 4 This is a partial structural diagram of the top surface of the battery connection system in a specific embodiment;

[0024] Figure 5 This is a partial structural diagram of the side where the bottom surface of the battery connection system is located in a specific embodiment;

[0025] Figure 6 for Figure 4 A partial sectional view of AA;

[0026] Figure 7 for Figure 6 A magnified view of the connection between the busbar and the flexible connector;

[0027] Figure 8 for Figure 5 A magnified view of the location of one of the temperature sensing components.

[0028] Explanation of reference numerals in the attached figures:

[0029] Battery module 100, battery cell 200, battery connection system 300;

[0030] Insulating film 310, first surface 310A, second surface 310B, through hole 311, observation hole 312;

[0031] Busbar 320, first connecting section 321, second connecting section 322;

[0032] Flexible connector 330, FFC 331, sampling cable 3311, FDC 332, sampling terminal 3321;

[0033] Temperature measuring component 340, temperature measuring bracket 341, first mating end 3411, second mating end 3412, thermal pad 342. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The ordinal numbers used in this article, such as first and second, are used to distinguish different parts with the same name and do not indicate a specific order or primary / secondary relationship.

[0036] For ease of understanding and concise description, the following text will explain the battery module and battery connection system together, and the beneficial effects will not be repeated.

[0037] For ease of understanding and explanation, this paper constructs three directions, namely the first direction x, the second direction y, and the third direction z as marked in the attached figure. The first direction x is the length direction of the battery module, which is also the length direction of the battery connection system. The second direction y is the width direction of the battery module, which is also the width direction of the battery connection system. The third direction z is the height direction of the battery module, which is also the thickness direction of the battery connection system.

[0038] Please refer to Figure 1 , Figure 1 This is a structural diagram of a battery module provided in one embodiment of this application.

[0039] This application provides a battery module 100, which includes multiple battery cells 200 and a battery connection system 300. The battery connection system 300 is located on the side where the terminals of the battery cells 200 are located. The battery connection system 300 can be used to connect the multiple battery cells 200 in series or in parallel, and can also be used to collect signals such as temperature or pressure from the battery cells 200. The battery connection system 300 facilitates the modular production of the battery module 100.

[0040] exist Figure 1 In the orientation shown, the terminals of cell 200 are facing upwards, and the battery connection system 300 is located above cell 200. In other application scenarios, cell 200 may be inverted, i.e., the terminals of cell 200 are facing downwards, in which case the battery connection system 300 is located below cell 200.

[0041] In a specific implementation, multiple battery cells 200 can be divided into at least one battery cell group. Multiple battery cells 200 in each battery cell group can be arranged along the first direction x, and each battery cell group can be arranged side by side along the second direction y.

[0042] Please refer to this as well. Figures 2 to 5 , Figure 2 This is a structural diagram of the battery connection system provided in one embodiment of this application. Figure 3 for Figure 2 The diagram shows a structural view of the battery connection system from another perspective. Figure 4 This is a partial structural diagram of the top surface of the battery connection system in a specific embodiment. Figure 5 This is a partial structural diagram of the bottom surface of the battery connection system in a specific embodiment. Wherein, Figure 2 and Figure 4 The structure of the side containing the first surface 310A of the insulating film 310 of the battery connection system 300 is shown. Figure 3 and Figure 5The structure of the side where the second surface 310B of the insulating film 310 of the battery connection system 300 is located is shown.

[0043] This application also provides a battery connection system 300, abbreviated as CCS (CellContact System). The battery connection system 300 is a single-sided membrane structure, including an insulating film 310, a busbar 320, and a flexible connector 330. The busbar 320 is located on the side of the insulating film 310 facing the terminal of the battery cell 200, and is connected to the insulating film 310. The flexible connector 330 is located on the side of the insulating film 310 facing the terminal of the battery cell 200, and is connected to the insulating film 310. The busbar 320 and the flexible connector 330 are electrically connected. Here, a single-sided membrane structure means that the battery connection system 300 only has the insulating film 310 on one side of the busbar 320, flexible connector 330, and other related accessories electrically connected to the battery cell 200. This insulating film 310 is used to connect the busbar 320, flexible connector 330, and other accessories.

[0044] In the battery module 100, the busbar 320 of the battery connection system 300 is electrically connected to the battery cell 200 to realize the series or parallel connection of multiple battery cells 200. The flexible connector 330 is electrically connected to the busbar 320 to collect signals such as pressure from the battery cells 200 that are electrically connected to the busbar 320.

[0045] Specifically, the insulating film 310 has a first surface 310A and a second surface 310B that are opposite to each other in a third direction z. In the battery module 100, the first surface 310A of the insulating film 310 faces away from the side where the battery cell 200 is located, and the second surface 310B of the insulating film 310 faces the side where the battery cell 200 is located. The busbar 320 and the flexible connector 330 are both connected to the second surface 310B of the insulating film 310.

[0046] Using the above scheme, the battery connection system 300 has a single-sided membrane structure, that is, the insulating film 310 is only set on the side of the busbar 320 and the flexible connector 330 away from the terminal of the cell 200. The busbar 320 and the flexible connector 330 are integrated through the insulating film 310. The battery connection system 300 uses the insulating film 310 to replace the traditional blister tray, and the insulating film 310 is set on the side of the busbar 320 and the flexible connector away from the terminal of the cell 200. It has a better insulation effect, and the material cost is low. It can reduce the weight of the battery connection system 300. The thickness of the insulating film 310 in the third z-direction is very small, which can effectively reduce the thickness of the battery connection system 300 in the third z-direction, which is conducive to the development and popularization of higher voltage platform and larger capacity battery technology.

[0047] In practical applications, along the second direction y, a terminal post is provided on each side of the battery cell 200. The terminals of two adjacent battery cells 200 located on the same side are electrically connected through a busbar 320. In this way, a single battery cell group arranged along the first direction x is provided with multiple busbars 320 on both sides of the second direction y, and the multiple busbars 320 on each side are arranged along the first direction x.

[0048] like Figure 5 As shown, the busbar 320 includes a first connecting section 321 and a second connecting section 322, which are electrically connected to the terminals of two battery cells 200 respectively.

[0049] The arrangement of busbar 320 reveals the arrangement of battery cells 200 within battery module 100. For example... Figures 1 to 3 In the embodiment shown, the battery module 100 includes two battery cell groups arranged along the second direction y. Each battery cell group is provided with a busbar 320 on both sides of the second direction y. Thus, the battery module 100 is provided with a total of four rows of busbars 320 arranged along the first direction x.

[0050] In other embodiments, the battery module 100 may include only one cell group, or it may have three or more cell groups. The structure of the battery connection system 300 can be configured to correspond to the cell group configuration.

[0051] In some implementations, the bus 320 is electrically connected to the terminal of the battery cell 200 by welding. The bus 320 has a connection area (not marked in the figure) for connection with the battery cell 200. Figure 2 and Figure 4 As shown, the insulating film 310 has a through hole 311. In a plane perpendicular to the thickness direction of the battery connection system 300, i.e., in a plane perpendicular to the third direction z, the projection of the through hole 311 at least partially coincides with the projection of the connection area of ​​the busbar 320. It can be understood that a portion of the surface of the busbar 320 facing the insulating film 310 is exposed through the through hole 311. This arrangement facilitates the welding operation of the terminals of the busbar 320 and the cell 200 when assembling the battery connection system 300 and the cell 200.

[0052] In some implementations, the flexible connector 330 includes an FFC (Flexible Flat Cable) 331 and an FDC (Flexible Die-cut Circuit) 332, and the bus 320 is electrically connected to the FFC 331 via the FDC 332, that is, the FDC 332 is electrically connected to the FFC 331 and also to the bus 320.

[0053] The FFC 331 extends along the first direction x. Multiple FDCs 332 are provided, spaced apart along the first direction x, with each FDC 332 connected to a busbar 320. The multiple FDCs 332 are located on either side of the FFC 331 in the second direction y.

[0054] The flexible connector 330 formed by integrating FFC 331 and FDC 332 can be called a Flexible Flat Cable Connect Flexible Die-cut Circuit (FCC).

[0055] The FFC 331 and FDC 332 both consist of two thin-film layers encasing the sampling circuitry. These films can be made of PI (Polyimide), which offers good temperature resistance and mechanical properties. The films in both FFC 331 and FDC 332 ensure their insulation and strength.

[0056] The processes for FFC 331 and FDC 332 are relatively simple and have a cost advantage, which helps to reduce the overall cost of the battery connection system 300.

[0057] Please refer to this as well. Figure 6 and Figure 7 , Figure 6 for Figure 4 A partial sectional view of AA. Figure 7 for Figure 6 A magnified view of the connection between the busbar and the flexible connector.

[0058] The FDC 332 of the flexible connector 330 has a sampling terminal 3321, which is electrically connected to the bus 320. The sampling line of the FDC 332, which is electrically connected to the sampling terminal 3321, is electrically connected to the sampling line of the FFC 331. In this way, the sampling terminal 3321 of the FDC 332 can collect relevant signals (such as pressure signals) from the cell 200 electrically connected to the bus 320 through the bus 320, and transmit the sampled signals to the battery management system through the FFC 331.

[0059] The sampling terminal 3321 of the FDC 332 is located between the bus 320 and the insulating film 310. This improves the connection strength between the sampling terminal 3321 and the bus 320. The sampling terminal 3321 is covered by the insulating film 310, which provides corrosion and oxidation protection.

[0060] The sampling terminal 3321 and bus 320 can be electrically connected by soldering. This method is convenient and the connection is reliable.

[0061] In practical applications, the FFC 331 can have multiple stacked sampling cables 3311, such as... Figure 7 As shown, multiple sampling cables 3311 are stacked in the third direction z, and each sampling cable 3311 can have multiple sampling lines. This ensures that each cell 200 can be electrically connected to one sampling line of the FFC 331, enabling signal acquisition from each cell 200 of the battery module 100. The sampling line of the FDC 332 electrically connected to the sampling terminal 3321 can be electrically connected to one sampling line of the sampling cables 3311 in a certain layer of the FFC 331.

[0062] Please refer to this as well. Figure 8 , Figure 8 for Figure 5 A magnified view of the location of one of the temperature sensing components.

[0063] In some embodiments, the battery connection system 300 further includes a temperature sensing assembly 340, which includes a temperature sensing bracket 341 and a temperature sensing element. The temperature sensing element is mounted on the temperature sensing bracket 341 and is used to detect the temperature of the battery module 100. The temperature sensing bracket 341 is located on the side where the second surface 310B of the insulating film 310 is located and is connected to the insulating film 310. The temperature sensing element is connected to the insulating film 310 through the temperature sensing bracket 341, facilitating the assembly of the temperature sensing element.

[0064] The temperature sensing element can be electrically connected to the FFC 331 to transmit temperature information to the battery management system via the FFC 331.

[0065] For example, the temperature sensing element can be an NTC (Negative Temperature Coefficient) thermistor.

[0066] The temperature sensing components 340 in the battery connection system 300 can be configured in a number and location determined according to the temperature sensing requirements of the battery module 100. Figure 3 In the example shown, each cell group has five temperature sensing components 340 arranged at intervals along the first direction x.

[0067] In the specific implementation, part of the temperature measuring bracket 341 overlaps with the busbar 320 and is located on the side of the busbar 320 facing the terminal post of the battery cell 200. In this way, in the thickness direction (third direction z) of the battery connection system 300, the busbar 320 presses against the temperature measuring bracket 341. Combined with the connection between the temperature measuring bracket 341 and the insulating film 310, the position of the temperature measuring bracket 341 can be well restricted, ensuring the accuracy of the position of the temperature measuring element, thereby ensuring the accuracy of the temperature measurement results.

[0068] In practice, the temperature measuring bracket 341 overlaps with the busbars 320 located on both sides of the FFC 331 to further improve the positioning accuracy of the temperature measuring bracket 341 in the third direction z.

[0069] like Figure 8 As shown, specifically, in the second direction y, the two ends of the temperature measuring bracket 341 extend out to form an FFC 331 to form a first mating end 3411 and a second mating end 3412. The first mating end 3411 overlaps with the busbar 320 located on one side of the FFC 331, and the second mating end 3412 overlaps with the busbar 320 located on the other side of the FFC 331.

[0070] The portion of the temperature measuring bracket 341 located between the busbar 320 and the FFC 331 is connected to the insulating film 310.

[0071] In some implementations, the temperature measuring bracket 341 is equipped with a thermally conductive pad 342, which is thermally connected to the temperature measuring element. In the battery module 100, the thermally conductive pad 342 contacts the battery cell 200. On the third direction z, under the pressure of the busbar 320, the thermally conductive pad 342 mounted on the temperature measuring bracket 341 can maintain good contact with the battery cell 200, thereby conducting the heat from the battery cell 200 to the temperature measuring element, which helps improve the measurement accuracy of the temperature measuring element.

[0072] In a specific implementation, the insulating film 310 has an observation hole 312, and at least a portion of the thermal pad 342 is exposed through the observation hole 312. Combined with... Figure 4 and Figure 5 Thus, on the front side of the battery connection system 300, i.e. the side where the first surface 310A of the insulating film 310 is located, the presence of the thermal pad 342 can be confirmed through the observation hole 312.

[0073] In practical applications, the temperature measuring bracket 341 can be provided with an opening, and part of the thermal pad 342 can correspond to the position of the opening. The opening corresponds to the position of the observation hole 312, so as to ensure that the thermal pad 342 can be observed from the side where the first surface 310A of the insulating film 310 is located.

[0074] In a specific implementation, the temperature sensing element can be located between the thermal pad 342 and the temperature sensing bracket 341. Figure 8From the viewpoint shown, the temperature sensing element is not visible. The position of the temperature sensing element can be offset from the position of the observation hole 312.

[0075] In some embodiments, the insulating film 310 has an adhesive backing layer on the side facing the busbar 320, that is, an adhesive backing layer is provided on the side where the second surface 310B of the insulating film 310 is located. The busbar 320, flexible connector 330, or temperature measuring bracket 341 can be connected to the insulating film 310 by adhesive bonding.

[0076] In practice, the insulating film 310 can be bonded and fixed to the busbar 320, the flexible connector 330, or the temperature measuring bracket 341 by hot pressing.

[0077] In actual operation, the adhesive layer of the insulating film 310 can melt under high temperature and pressure, and the adhesive can be cured under cooling and pressure holding to connect and fix the busbar 320, flexible connector 330, or temperature measuring bracket 341 with high connection strength. The adhesive effect of the insulating film 310 ensures the insulation and strength of the connection points between FFC 331 and busbar 320, and between FDC 332 and busbar 320, and also ensures the connection strength of the temperature measuring bracket 341. This improves the mechanical properties of the sampling position, ensures the reliability of collected voltage and temperature information, and helps improve the safety performance of the battery module 100. The temperature, pressure, and holding pressure during hot pressing can all be set according to actual application requirements.

[0078] For example, the insulating film 310 can be a PI (Polyimide) film or a PET (Polyethylene terephthalate) film.

[0079] This application embodiment also provides a battery pack, which includes a battery box and a battery module 100 installed inside the battery box. The battery module 100 is the same as the battery module 100 described in the foregoing embodiments. Because the structural design of the battery connection system 300 of the battery module 100 can reduce weight and space occupied in the third direction z, it is also beneficial for reducing the weight of the battery pack and increasing its energy density.

[0080] This application also provides a vehicle that includes the aforementioned battery pack. The vehicle can be an electric vehicle, including a pure electric vehicle or a hybrid vehicle, and the battery pack can serve as a power source for the electric vehicle.

[0081] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A battery connection system, characterized by The battery connection system (300) is a single-sided film structure, and the battery connection system (300) comprises an insulating film (310), a busbar (320), and a flexible connecting piece (330); The busbar (320) is located on the side of the insulating film (310) facing the pole of the battery cell, and the busbar (320) is connected with the insulating film (310); The flexible connecting piece (330) is located on the side of the insulating film (310) facing the pole of the battery cell, and the flexible connecting piece (330) is connected with the insulating film (310); The busbar (320) and the flexible connecting piece (330) are electrically connected.

2. The battery connection system of claim 1, wherein, The flexible connecting piece (330) comprises a flexible flat cable (331) and a flexible die-cut circuit board (332), and the busbar (320) is electrically connected with the flexible flat cable (331) through the flexible die-cut circuit board (332).

3. The battery connection system of claim 2, wherein, The flexible die-cut circuit board (332) has a sampling terminal (3321) electrically connected with the busbar (320), and the sampling terminal (3321) is located between the busbar (320) and the insulating film (310).

4. The battery connection system of claim 1, wherein, The battery connection system (300) further comprises a temperature measurement assembly (340), and the temperature measurement assembly (340) comprises a temperature measurement support (341) and a temperature measurement element, wherein the temperature measurement element is installed on the temperature measurement support (341), the temperature measurement support (341) is located on the side of the insulating film (310) facing the pole of the battery cell and is connected with the insulating film (310).

5. The battery connection system of claim 4, wherein, Part of the temperature measurement support (341) overlaps with the busbar (320) and is located on the side of the busbar (320) facing the pole of the battery cell.

6. The battery connection system of claim 4, wherein, The temperature measurement support (341) is installed with a heat-conducting pad (342) which is in thermal conduction connection with the temperature measurement element, and the insulating film (310) has an observation hole (312), and at least part of the heat-conducting pad (342) is exposed to the observation hole (312).

7. The battery connection system according to any of claims 1-6, characterized in that, The insulating film (310) has a through hole (311), and the busbar (320) has a connecting area connected with the battery cell (200), and in a plane perpendicular to the thickness direction of the battery connection system (300), the projection of the through hole (311) at least partially overlaps with the projection of the connecting area.

8. The battery connection system of any one of claims 1-6, wherein, The side of the insulating film (310) facing the busbar (320) has an adhesive layer.

9. A battery module, characterized by A battery module (100) comprising a plurality of battery cells (200) and the battery connection system (300) according to any one of claims 1-8, wherein the battery cells (200) are located on the side of the busbar (320) away from the insulating film (310), and the busbar (320) is electrically connected with the pole of the battery cell (200).

10. A battery pack, characterized by, A battery pack comprising the battery module (100) according to claim 9.

11. Vehicle, characterized in that A battery pack comprising the battery pack according to claim 10.

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