Battery pack

Abstract

The utility model discloses a battery pack which comprises a BMS (battery management system) board and a battery pack, the battery pack and the BMS board are oppositely arranged along a first direction, the battery pack comprises a plurality of battery units which are arranged along the first direction, and each battery unit comprises a flexible circuit board; the flexible circuit boards of all the battery units are sequentially connected in the first direction through the connectors, and the flexible circuit boards of the battery units adjacent to the BMS board in the first direction are connected with the BMS board through the connectors. The battery pack provided by the utility model can reduce wire harness switching in the battery pack, is fixed and firm in connection, improves the acquisition precision of voltage and temperature sensing, and reduces the failure rate, thereby prolonging the service life of the battery pack.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a battery pack. Background Art

[0002] As a key market for new energy development, commercial vehicles are experiencing rapid growth. These vehicles primarily include buses, light trucks, heavy trucks, and logistics vehicles. Due to their specific operating requirements, commercial vehicles place higher demands on overall battery power and voltage than passenger vehicles.

[0003] More battery power means longer driving range, ensuring long-distance transportation. A high-voltage platform also improves vehicle efficiency. This significantly improves charging and discharging efficiency, increases vehicle transportation efficiency, and reduces waiting time during charging, which in turn reduces transportation costs and increases transportation revenue. Furthermore, a high-voltage platform operates at a lower current, saving wiring volume and reducing internal circuit resistance losses, thereby indirectly increasing power density and energy efficiency. For the same power consumption, a vehicle with a high-voltage platform can increase its range by 10% and more than double its charging speed.

[0004] Furthermore, when designing battery packs for high-voltage platforms, the overall space utilization of the battery pack must be considered due to vehicle installation space constraints. This requires both high power delivery and sufficient internal installation space, placing high demands on the overall battery pack dimensions. Maximizing space utilization also increases the complexity of collecting voltage and temperature data from individual cells within the battery pack. Therefore, the battery pack's data collection design must be easy to install and offer high accuracy. Utility Model Content

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a battery pack.

[0006] The embodiment of the present utility model discloses a battery pack, comprising:

[0007] BMS board;

[0008] A battery pack is arranged opposite to the BMS board along a first direction, and the battery pack includes:

[0009] A plurality of battery cells are arranged along the first direction, each of the battery cells comprising a flexible circuit board;

[0010] The flexible circuit board of each battery cell is sequentially connected along the first direction through the connector, and the flexible circuit boards of the battery cells adjacent to the BMS board along the first direction are connected to the BMS board through the connector.

[0011] The above technical solution can reduce the wiring harness switching in the battery pack, make the connection more secure, improve the voltage and temperature sensing acquisition accuracy, reduce the failure rate, and thus extend the service life of the battery pack.

[0012] Optionally, the battery unit includes 4 or more battery cell groups, and the number of the battery units is 2 or more.

[0013] Optionally, the battery cell groups are arranged in sequence along the second direction and the height direction respectively, and the first direction, the second direction and the height direction are perpendicular to each other.

[0014] Optionally, the battery cell group includes a plurality of battery cells and a series-connected aluminum bar, and the plurality of battery cells are connected by the series-connected aluminum bar.

[0015] Optionally, the battery pack further includes an injection-molded bracket, which is used to connect the series-connected aluminum bars and the flexible circuit board.

[0016] Optionally, the battery pack further includes an output aluminum bar, and the output aluminum bar and the injection-molded bracket are detachably connected.

[0017] Optionally, the connector consists of a socket and a plug.

[0018] Optionally, the battery pack further includes an epoxy board, and the socket is glued and fixed to the epoxy board.

[0019] Optionally, the connector is connected to the flexible circuit board through surface mounting technology (SMT).

[0020] Optionally, the flexible circuit board includes a nickel sheet and a temperature sensor, and the nickel sheet is used to collect voltage data of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram showing a battery pack according to an embodiment of the present invention Figure 1 ;

[0022] Figure 2 A three-dimensional diagram showing a battery pack according to an embodiment of the present invention Figure 2 ;

[0023] Figure 3 A schematic diagram of a front view of a battery pack according to an embodiment of the present utility model is shown;

[0024] Figure 4 A schematic top view of a battery pack according to an embodiment of the present invention is shown;

[0025] Figure 5 Show Figure 1 A right side view schematic diagram of a battery pack according to an embodiment of the present invention.

[0026] 0. Battery pack, 01. Battery cell, 11. Cell pack, 110. Cell, 111. Flexible circuit board, 1111. Nickel sheet, 1112. Temperature sensor, 02. Connector, 21. Socket, 22. Plug, 03. Series aluminum busbar, 04. Injection molded bracket, 05. Epoxy board, 06.

[0027] Output aluminum busbar,

[0028] x. First direction, y. Second direction, z. Height direction. DETAILED DESCRIPTION

[0029] The following is an explanation of the implementation of the present invention by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0032] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0034] In the embodiments of the present application, "BMS board" refers to a battery management system (Battery Management System), which is used to cooperate with equipment for monitoring the status of energy storage batteries. Its main function is to intelligently manage and maintain each battery unit, prevent overcharging and over-discharging of the battery, extend the battery life, and monitor the battery status.

[0035] The embodiment of the present utility model discloses a battery pack, including a BMS board and a battery pack, such as Figure 1-Figure 5 As shown, the battery pack 0 disclosed in the embodiment of the present invention, the battery pack 0 and the BMS board are arranged relative to each other along a first direction, and the first direction is, for example, Figure 1 In the x-direction, battery pack 0 includes:

[0036] A plurality of battery cells 01 are arranged along a first direction, each battery cell 01 including a flexible circuit board 111;

[0037] Connector 02 , the flexible circuit board 111 of each battery cell 01 is connected in sequence along the first direction through the connector 02 , and the flexible circuit boards 111 of the battery cells 01 adjacent to the BMS board along the first direction are connected to the BMS board through the connector 02 .

[0038] Connector 02 is connected to the flexible circuit board 111 via surface mount technology (SMT). Connector 02 consists of a socket 21 and a plug 22. Specifically, socket 21 and plug 22 are connected to the flexible circuit board 111 via SMT. Battery pack 0 also includes an epoxy board 05, to which socket 21 is attached, for example, using 3M adhesive. The use of surface mount technology (SMT) improves assembly efficiency and precision, reduces errors that can occur during manual soldering, and ensures the overall reliability of battery pack 0. Connecting socket 21 to the flexible circuit board 111 via SMT not only simplifies the assembly process but also reduces production costs. Connector 02 is fixed to epoxy board 05, reducing the risk of connector 02 shaking or poor contact due to vibration or impact during use of battery pack 0. The epoxy board 05 also provides excellent insulation, preventing short circuits and further enhancing the safety of battery pack 0. In addition, the separate design of the plug 22 and the socket 21 allows for quick replacement when a battery cell 01 fails without the need for re-welding, greatly shortening maintenance time and reducing maintenance difficulty. Using the above technical solution, the flexible circuit boards 111 of multiple battery cells 01 are connected sequentially through the connector 02, and the flexible circuit boards 111 of adjacent BMS board battery cells 01 are connected to the BMS board through the connector 02. Compared with the prior art in which the flexible circuit boards 111 of multiple battery cells 01 are independently connected to the BMS board through a wiring harness, the utility model has a simple structure and is easy to install. It reduces the wiring harness transfer in the battery pack and the connection is secure and fixed. The traditional wiring harness inside the battery pack is reduced, which means that the line resistance in the battery pack is reduced, the accuracy of voltage and temperature sensing is improved, secondary transfer is avoided, the failure rate is reduced, and the service life of the battery pack is extended.

[0039] In some other possible embodiments provided by the present invention, the battery unit 01 includes 4 or more battery cell groups 11, and the battery unit 01 is 2 or more, thereby achieving a higher power capacity of a single battery pack and improving the overall driving range.

[0040] Furthermore, the cell groups 11 are arranged in sequence along the second direction and the height direction, that is, the cell groups 11 are divided into multiple layers along the second direction and the height direction. The first direction, the second direction and the height direction are perpendicular to each other, and the second direction is, for example, Figure 1 The y direction shown in , the height direction is Figure 1The z direction shown in . The above-mentioned multi-layer structure maximizes the space utilization efficiency of the battery pack, allowing the battery pack to accommodate more battery cells 110 in a limited volume, thereby significantly improving the energy density of the battery pack and increasing the endurance of the vehicle. Secondly, the multi-layer structure ensures a more uniform heat distribution inside the battery pack, which is conducive to heat dissipation and reduces the safety risks caused by local overheating of the battery. Furthermore, the battery cell groups 11 are arranged in three mutually perpendicular directions, which enhances the mechanical stability of the battery pack and reduces the probability of battery cell damage caused by vibration or impact during vehicle operation.

[0041] Specifically, refer to Figure 1-Figure 3 As shown, in this embodiment, the battery unit 01 includes 4 cell groups 11, and there are 2 battery cells 01, that is, the 2 battery cells 01 are arranged in sequence along the first direction, and each battery unit 01 includes 4 cell groups 11. Among them, the 4 cell groups 11 are divided into 2 layers along the height direction, with 2 cell groups 11 in each layer, and the 2 cell groups are divided into 2 layers along the second direction, that is, the 2 cell groups are arranged in sequence along the second direction. Each cell group 11 has an independent flexible circuit board 111, and the cell group 11 is connected to the cell group 11 adjacent to the first direction through a connector 02. Each cell group 11 can be composed of at least 22 cell groups 110 stacked together, and multiple cell groups 11 are connected in series. Thus, by connecting multiple cell groups 11 in series, a single battery pack can achieve a high-voltage platform design, while the entire pack has a higher power, thereby improving the overall cruising range.

[0042] In this embodiment, combined with Figure 1 and Figure 4 As shown, the battery pack 0 and the BMS board are arranged in a first direction (eg Figure 1 When the battery pack 0 includes two battery cells 01, that is, the battery cells 01, the battery cells 01 and the BMS board are arranged in the first direction (for example, Figure 1 More specifically, the first direction is, for example, Figure 4 The width direction of the battery pack 0 is the extending direction of the battery pack 0 from left to right, that is, the battery cell 01, the battery cell 01 and the BMS board are arranged in sequence from left to right.

[0043] In some other possible embodiments provided by the present invention, Figure 1 and Figure 4As shown, the battery pack 11 includes multiple battery cells 110 and a series aluminum busbar 03, with the multiple battery cells 110 connected via the series aluminum busbar 03. Specifically, a single battery pack 11 is composed of multiple stacked battery cells 110, with the positive and negative electrodes of the multiple battery cells 110 connected via the series aluminum busbar 03. For example, the battery cells 110 and the series aluminum busbar 03 are welded together. The series aluminum busbar 03 connection reduces the number of connecting wires between the battery cells 110, facilitating assembly and reducing potential failure points caused by complex wiring. It also ensures overcurrent protection while reducing losses, thereby improving the reliability of the battery pack.

[0044] In some other possible embodiments of the present invention, the battery pack 0 further includes an injection-molded bracket 04 and an output aluminum busbar 06. The output aluminum busbar 06 and the injection-molded bracket 04 are detachably connected, and the injection-molded bracket 04 is used to connect the series aluminum busbar 03 and the flexible circuit board 111. The series aluminum busbar 03 and the output aluminum busbar 06 are detachably connected to the injection-molded bracket 04, such as by snap-fit ​​connections. The injection-molded bracket 04 secures the series aluminum busbar 03, thereby ensuring electrical clearance and creepage distances. The flexible circuit board 111 is secured to the injection-molded bracket 04 by gluing, for example, using 3M adhesive. Furthermore, an epoxy board 05 is secured to the injection-molded bracket 04, such as by mounting holes at both ends of the epoxy board 05 along the second direction, which are secured to the injection-molded bracket 04 via heat-seal posts. The integrated design of the injection-molded bracket 04, which integrates the output aluminum busbar 06, the series aluminum busbar 03, the connector 02, and the flexible circuit board 111, improves battery pack assembly efficiency and reduces labor costs during assembly.

[0045] Furthermore, each battery cell group 11 includes two injection-molded brackets 04 , which are respectively used to integrate the positive and negative electrodes of multiple battery cells 110 , thereby avoiding the short circuit problem of the positive and negative electrodes when multiple battery cell groups 11 are connected and installed.

[0046] In this embodiment, the flexible circuit board 111 includes a nickel sheet 1111 and a temperature sensor 1112. The nickel sheet 1111 is used to collect voltage data from the battery cell 110, and the temperature sensor 1112 is used to collect temperature data from the battery cell 11. Specifically, the positive and negative electrodes of the battery cell 110 are connected via a series aluminum busbar 03. The battery cell groups 11 are connected in series via an output aluminum busbar 06 connected to an external copper busbar to form a high-voltage circuit. The temperature and voltage data collected by the nickel sheet 1111 and the temperature sensor 1112 from the battery cell 110 are transmitted in real time to the BMS board via connector 02.

[0047] Nickel sheet 1111 is welded to the series-connected aluminum bar 03 and flexible printed circuit board 111, respectively. Temperature sensor 1112 is also welded to the series-connected aluminum bar 03 and flexible printed circuit board 111, respectively. Preferably, temperature sensor 1112 is adjacent to nickel sheet 1111 to facilitate response to thermal changes in battery cells 110, providing real-time voltage and temperature feedback for battery thermal management, helping to prevent overheating and ensure the safety of battery pack 0. Furthermore, the adjacent connection between temperature sensor 1112 and nickel sheet 1111 facilitates shared data transmission paths, reducing data processing complexity and time, and improving the responsiveness and efficiency of the BMS board.

[0048] In summary, the present invention reduces the use of acquisition wiring harnesses between the battery cell group 11 and the BMS board by setting the flexible circuit board 111 of each battery cell 01 to be connected in sequence along the first direction through the connector 02, and the flexible circuit board 111 of the battery cell 01 adjacent to the BMS board along the first direction is connected to the BMS board through the connector 02, thereby avoiding the secondary connection of the connectors between the battery cell groups 11, improving the acquisition accuracy, reducing the acquisition failure rate, and ensuring the efficient and safe operation of the battery pack. The battery pack of the present invention includes multiple battery cell groups 11. By connecting the battery cell groups 11 in series, a single battery pack can achieve a high-voltage platform design. At the same time, the entire pack has a higher power, which improves the overall cruising range. In addition, each battery cell group 11 is integrated through the injection molded bracket 04 to achieve an integrated design, which improves assembly efficiency. Reduce labor costs during the assembly process.

[0049] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the present invention should not be construed as being limited to these descriptions. Those skilled in the art may make various changes in form and detail, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery pack, characterized in that: include: BMS board; A battery pack is arranged opposite to the BMS board along a first direction, and the battery pack includes: A plurality of battery cells are arranged along the first direction, each of the battery cells comprising a flexible circuit board; The flexible circuit board of each battery cell is sequentially connected along the first direction through the connector, and the flexible circuit boards of the battery cells adjacent to the BMS board along the first direction are connected to the BMS board through the connector.

2. The battery pack according to claim 1, wherein: The battery unit includes 4 or more battery cell groups, and the battery units are 2 or more.

3. The battery pack according to claim 2, wherein: The battery cell groups are arranged in sequence along the second direction and the height direction respectively, and the first direction, the second direction and the height direction are perpendicular to each other.

4. The battery pack according to claim 2, wherein: The battery cell group includes a plurality of battery cells and a series-connected aluminum busbar, and the plurality of battery cells are connected by the series-connected aluminum busbar.

5. The battery pack according to claim 4, wherein: The battery pack further includes an injection-molded bracket, which is used to connect the series-connected aluminum bars and the flexible circuit board.

6. The battery pack according to claim 5, wherein: The battery pack further includes an output aluminum bar, and the output aluminum bar is detachably connected to the injection-molded bracket.

7. The battery pack according to claim 1, wherein: The connector consists of a socket and a plug.

8. The battery pack according to claim 7, wherein: The battery pack further includes an epoxy plate, and the socket is adhered and fixed to the epoxy plate.

9. The battery pack according to claim 1, wherein: The connector is connected to the flexible circuit board through surface mounting technology (SMT).

10. The battery pack according to claim 1, wherein: The flexible circuit board includes a nickel sheet and a temperature sensor, and the nickel sheet is used to collect voltage data of the battery pack.

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