A wiring harness board assembly and battery pack

Abstract

The utility model provides a kind of wiring harness board assembly and battery pack, belong to battery field.The wiring harness board assembly includes upper layer wiring harness board and lower layer wiring harness board, and power supply circuit and information acquisition circuit are arranged in upper layer wiring harness board and lower layer wiring harness board, and the end of power supply circuit is provided with the conductive sheet for being electrically connected with the pole of battery cell, and the conductive sheet on the wiring harness board of same layer is used for being electrically connected with the pole of battery cell of same polarity, and insulating isolation layer is arranged between upper layer wiring harness board and lower layer wiring harness board.The battery pack includes the wiring harness board assembly described above.The utility model arranges power supply circuit and information acquisition circuit in upper and lower two layers of wiring harness board, so that wiring harness board can realize low voltage, small current charging and discharging, make power battery internal wiring more neat, facilitate the production and later maintenance of power battery.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, and in particular relates to a wire harness board assembly and a battery pack. Background Technology

[0002] The power battery of new energy vehicles includes cells, high-voltage busbars and low-voltage wiring harnesses. The cells are connected in series through the busbars to form a battery module, or the cells are first connected in parallel to form a cell group and then the individual cell groups are connected in series to form a battery module.

[0003] The high-voltage busbar connects to the positive and negative terminals of the battery module as a charging and discharging channel. The low-voltage harness is often used to transmit signals to obtain the operating status of the battery cells, such as connecting to a temperature sensor to measure cell temperature or connecting to the cell terminals to measure the voltage of an individual cell. Low-voltage harnesses are typically housed in a harness board to improve wiring efficiency and reduce space occupation within the battery pack. One end of the harness board connects to the vehicle's BMS (Battery Management System) via a connector.

[0004] As new energy vehicles become increasingly feature-rich, the number of low-voltage electrical appliances on them will also increase. If these low-voltage appliances are powered by the high-voltage busbar of the power battery, a transformer needs to be installed outside the power battery to convert the high-voltage direct current into low-voltage direct current. This voltage conversion structure is relatively complex, increases the production cost of new energy vehicles, occupies space on the vehicle, and affects the layout of other equipment. In addition, the output voltage of the transformer is difficult to adjust, making it inconvenient to power various low-voltage electrical appliances.

[0005] Furthermore, the capacity of each cell in a battery module varies. If the power battery is charged using only a high-voltage busbar, each cell in the battery module will be charged with the same current at the same time. To avoid overcharging of some cells with smaller capacity, the entire system will usually stop charging after the cells with smaller capacity are fully charged, resulting in a low overall capacity utilization rate of the power battery. Utility Model Content

[0006] The purpose of this utility model is to provide a wire harness board assembly, which can be applied in a battery pack to solve the technical problems of low capacity utilization and low voltage output of power batteries that depend on voltage conversion structure in the prior art.

[0007] Another objective of this invention is to provide a battery pack to solve the aforementioned technical problems.

[0008] To achieve the above objectives, the technical solution of the wire harness board assembly provided by this utility model is as follows:

[0009] A wire harness board assembly includes an upper wire harness board and a lower wire harness board. Power supply lines and information acquisition lines are arranged in both the upper and lower wire harness boards. The ends of the power supply lines are provided with conductive plates for conductive connection with the terminals of the battery cells. The conductive plates on the same wire harness board are used for conductive connection with the terminals of the same polarity of the battery cells. An insulating layer is provided between the upper and lower wire harness boards.

[0010] As a further improvement, conductive sheets are disposed on both sides of the wire harness plate in the width direction, and the conductive sheets on both sides of the same wire harness plate in the width direction are alternately arranged in the length direction of the wire harness plate.

[0011] As a further improvement, the insulating layer is an insulating elastic buffer layer.

[0012] As a further improvement, an insulating layer is also provided on the underside of the lower wiring harness board.

[0013] As a further improvement, the wiring harness assembly also includes a connector for connection to the BMS, with both the upper and lower wiring harness boards connected to the same connector.

[0014] The beneficial effects are as follows: The wiring harness board assembly provided by this utility model is a pioneering invention. This assembly integrates a power supply line capable of charging and discharging the battery cells with low current and low voltage, allowing for selective charging and discharging of individual cells. On the one hand, it ensures that cells with varying capacities are fully charged or depleted, improving the battery pack's capacity utilization. On the other hand, it allows for selective discharge of a subset of cells to output low-voltage electricity, eliminating the need for a separate voltage conversion structure. Furthermore, by integrating both the power supply line and the information acquisition line into the wiring harness board assembly, the internal wiring of the battery pack becomes more centralized, facilitating battery pack manufacturing and subsequent maintenance. Simultaneously, the wiring harness board assembly has two layers of wiring harness boards separated by an insulating layer. This ensures a significant insulation distance between power supply lines in the same circuit, reducing the likelihood of short circuits. While utilizing the wiring harness board for low-current, low-voltage charging and discharging of the battery cells, it guarantees high reliability and safety.

[0015] To achieve the above objectives, the technical solution for the battery pack provided by this utility model is as follows:

[0016] A battery pack includes battery cells and a wiring harness assembly. The wiring harness assembly includes an upper wiring harness board and a lower wiring harness board. Power supply lines and information acquisition lines are arranged in both the upper and lower wiring harness boards. The ends of the power supply lines are provided with conductive plates that are conductively connected to the terminals of the battery cells. The conductive plates on the same layer of the wiring harness board are conductively connected to the terminals of the battery cells of the same polarity. An insulating layer is provided between the upper and lower wiring harness boards.

[0017] As a further improvement, conductive sheets are disposed on both sides of the wire harness plate in the width direction, and the conductive sheets on both sides of the same wire harness plate in the width direction are alternately arranged in the length direction of the wire harness plate.

[0018] As a further improvement, the insulating layer is an insulating elastic buffer layer.

[0019] As a further improvement, an insulating layer is also provided on the underside of the lower wiring harness board.

[0020] As a further improvement, the wiring harness assembly also includes a connector for connection to the BMS, with both the upper and lower wiring harness boards connected to the same connector.

[0021] The beneficial effects are as follows: The battery pack provided by this utility model is an improvement on the existing technology. The wiring harness assembly integrates a power supply line capable of charging and discharging the battery cells with low current and low voltage, enabling selective charging and discharging of each cell. On the one hand, it ensures that cells with different capacities can be fully charged or depleted, improving the capacity utilization rate of the battery pack. On the other hand, it can also select a portion of the cells for discharge to output low-voltage electricity, eliminating the need for a separate voltage conversion structure. Furthermore, by placing both the power supply line and the information acquisition line within the wiring harness assembly, the internal wiring of the battery pack is more centralized, facilitating battery pack manufacturing and subsequent maintenance. Simultaneously, the wiring harness assembly has two layers of wiring harness boards separated by an insulating layer, ensuring a large insulation distance between power supply lines in the same circuit, reducing the likelihood of short circuits. While utilizing the wiring harness board for low-current, low-voltage charging and discharging of the battery cells, it ensures high reliability and safety of the wiring harness board. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of embodiment 1 of the battery pack in this utility model;

[0023] Figure 2 This is a schematic diagram of the wiring harness assembly in Embodiment 1 of the battery pack of this utility model;

[0024] Figure 3 This is a partial structural diagram of the wire harness board assembly in Embodiment 1 of the battery pack of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Outer casing; 2. Battery cell; 3. Wiring harness assembly; 31. Upper wiring harness board; 32. Lower wiring harness board; 33. Conductive sheet; 34. Connector; 35. Foam. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the embodiments.

[0028] Specific Embodiment 1 of the battery pack provided by this utility model:

[0029] A battery pack, see appendix Figure 1 The battery pack includes a housing 1 and battery cells 2 disposed within the housing 1. Multiple battery cells 2 are connected in series via a busbar to form a battery module. The battery pack also includes a high-voltage busbar and a low-voltage wiring harness. The high-voltage busbar is connected to the positive and negative terminals of the battery module as a whole, providing a channel for charging and discharging the battery module as a whole. The low-voltage wiring harness is arranged in the form of a wiring harness board assembly 3, and each battery module is equipped with one wiring harness board assembly 3.

[0030] See appendix Figure 2 and attached Figure 3 The wire harness board assembly 3 includes an upper wire harness board 31, a lower wire harness board 32, an upper insulating isolation layer disposed between the upper wire harness board 31 and the lower wire harness board 32, and a lower insulating isolation layer disposed on the underside of the lower wire harness board 32.

[0031] Both the upper wiring harness board 31 and the lower wiring harness board 32 are equipped with power supply lines and information acquisition lines. Each power supply line has a conductive sheet 33 at its end, which is conductively connected to the corresponding terminal of the battery cell 2. Specifically, the conductive sheet 33 can be directly welded to the corresponding terminal or to the conductive busbar connected to the corresponding terminal.

[0032] The conductive sheets 33 on the upper wire harness plate 31 are disposed on both sides of the upper wire harness plate 31 in the width direction, and the conductive sheets 33 on both sides of the upper wire harness plate 31 in the width direction are alternately arranged in the length direction of the upper wire harness plate 31. The conductive sheets 33 on the lower wire harness plate 32 are disposed on both sides of the lower wire harness plate 32 in the width direction, and the conductive sheets 33 on both sides of the lower wire harness plate 32 in the width direction are alternately arranged in the length direction of the lower wire harness plate 32.

[0033] The number of conductive sheets 33 on the upper wiring harness board 31 is equal to the number of battery cells 2 in the corresponding battery module, and the conductive sheets 33 on the upper wiring harness board 31 are electrically connected to the negative terminal of each battery cell 2 in the corresponding battery module. The number of conductive sheets 33 on the lower wiring harness board 32 is equal to the number of battery cells 2 in the corresponding battery module, and the conductive sheets 33 on the lower wiring harness board 32 are electrically connected to the positive terminal of each battery cell 2 in the corresponding battery module.

[0034] The wiring harness assembly 3 also includes a connector 34 for connection to the BMS. One wiring harness assembly 3 is configured with one connector 34. The upper wiring harness 31 and the lower wiring harness 32 in a wiring harness assembly 3 are both connected to the same connector 34, and the upper wiring harness 31 and the lower wiring harness 32 maintain a certain distance from each other near the connector 34.

[0035] The information acquisition circuit includes a voltage acquisition circuit for acquiring voltage information of battery cell 2, and a temperature acquisition circuit for acquiring the operating temperature of battery cell 2. The voltage acquisition circuit is directly conductively connected to the corresponding conductive sheet 33, while the temperature acquisition circuit has a temperature sensor connected to its end, which is mounted on the conductive sheet 33. The conductive sheet 33 with the temperature sensor is larger than the conductive sheet 33 without the temperature sensor; three or four such conductive sheets 33 are used in a battery module.

[0036] In this embodiment, both the upper and lower insulating layers are made of foam 35. The foam 35 maintains the insulation distance between the upper wiring harness board 31 and the lower wiring harness board 32, and also acts as a buffer, protecting both boards. The upper and lower wiring harness boards 31 and 32 are glued to the foam 35, and the lower wiring harness board 32 is also glued to the foam 35 on its underside. After the upper and lower wiring harness boards 31 and 32 are fixed together with the foam 35 to form an integral structure, they are then installed as a whole. During installation, the foam 35 on the underside of the lower wiring harness board 32 is first glued to the upper side of the battery module, and then the conductive sheet 33 is welded.

[0037] In other embodiments, the upper and lower insulating layers can also be rubber layers or foam plastic layers. Rubber layers and foam plastic layers can also serve as insulation and cushioning, thus the foam 35, rubber layer, and foam plastic layer all constitute an insulating elastic cushioning layer. In other embodiments, the upper and lower insulating layers can also be rigid insulating plastic sheets, which only serve an insulating function and do not provide cushioning.

[0038] During use, the BMS can collect the operating temperature and real-time voltage of each battery cell 2 using the information acquisition lines to understand the operating status of each battery cell 2, and then manage the charging or discharging of each battery cell 2 based on the operating status of each battery cell 2. Each line of the power supply line is equipped with a switching element for controlling the on / off state of the line, and the switching element is controlled by the BMS.

[0039] Specifically, during battery pack discharge, high-voltage discharge is achieved through a high-voltage busbar to power components such as the vehicle's motor. If power is needed for low-voltage electrical appliances, discharge is achieved through the power supply line. The BMS can determine the number of cells 2 that need to be connected for discharge based on the power demand of the low-voltage appliances. This allows the BMS output voltage to directly meet the needs of the low-voltage appliances without requiring a separate voltage conversion structure, effectively reducing the complexity and cost of new energy vehicles while saving internal space.

[0040] When discharging using the power supply line, the specific cell 2 can be selected based on its condition. For example, cells 2 with more remaining charge can be selected for discharge, or cells 2 with higher temperatures can be avoided. This takes into account the specific conditions of each cell 2, ensuring that each cell 2 is fully discharged and improving the utilization efficiency of the cells 2.

[0041] During the battery pack charging process, a high-current overall charging is performed through a high-voltage busbar. After the current charging is completed, the charge status of each cell 2 can be detected. If some cells 2 are not fully charged, the corresponding power supply line can be connected to charge the corresponding cell 2 with a small current until it is fully charged.

[0042] Due to manufacturing errors and other factors, there are certain differences in the capacity of each cell 2. Therefore, selective charging and discharging of the cells 2 using the power supply line can not only meet the needs of low-voltage power supply, but also ensure that each cell 2 can be fully charged and discharged, avoiding different lifespans due to different charging and discharging degrees of the cells 2, and affecting the overall lifespan of the battery pack.

[0043] Compared with the prior art, in this utility model, both the power supply line and the information acquisition line are arranged in the wire harness board assembly 3. If they are arranged on the same wire harness board, the space for the line arrangement will be relatively cramped. However, if they are arranged on the upper and lower wire harness boards, there will be more redundant space, which will facilitate the design of the line arrangement.

[0044] Furthermore, due to limitations in the manufacturing process of the wire harness board, the cross-sectional dimensions of the conductors in the wire harness board are generally small. Compared to the information acquisition lines, the current and voltage on the power supply lines are much larger. Therefore, if the conductors in the same circuit of the power supply line are too close together, especially if the membrane structure on the wire harness board is damaged, the power supply line is very prone to short circuits. Therefore, in this invention, the wire harness board is divided into upper and lower layers. The upper wire harness board 31 and the lower wire harness board 32 are connected to the negative and positive terminals of the battery cell 2, respectively. Foam 35 is placed between the upper and lower wire harness boards. This allows the wires in the same circuit to be separated by a larger distance, avoiding short circuits.

[0045] Specific embodiment 2 of the battery pack provided by this utility model:

[0046] This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that the wire harness board assembly in this embodiment is provided with two connectors. The upper wire harness board is connected to one of the connectors, and the lower wire harness board is connected to the other connector.

[0047] Specific embodiment 3 of the battery pack provided by this utility model:

[0048] This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that in this embodiment, foam is not provided on the lower side of the lower wiring harness board. Instead, the foam is first pasted onto the battery module, and then the lower wiring harness board is pasted onto the foam.

[0049] Specific embodiment 4 of the battery pack provided by this utility model:

[0050] This embodiment is based on Embodiment 1, but differs in that the conductive sheets on the wire harness board in this embodiment can all be arranged on the same side of the wire harness board in the width direction. The arrangement of the conductive sheets is related to the arrangement of the battery cells, but regardless of the embodiment, the conductive sheets on the same layer of the wire harness board are all conductively connected to the terminals of the same polarity of the battery cells.

[0051] Specific embodiment 5 of the battery pack provided by this utility model:

[0052] This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that in this embodiment, the conductive sheet on the upper wire harness board is connected to the positive electrode of the battery cell, while the conductive sheet on the lower wire harness board is connected to the negative electrode of the battery cell.

[0053] Specific embodiments of the wire harness board assembly provided by this utility model:

[0054] The wiring harness assembly is the same as the wiring harness assembly in the specific embodiment of the battery pack described above, and will not be described in detail again.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wire harness board assembly, characterized in that, It includes an upper wire harness board and a lower wire harness board. Both the upper and lower wire harness boards are equipped with power supply lines and information acquisition lines. The end of each power supply line is equipped with a conductive plate for conductive connection with the terminal of the battery cell. The conductive plates on the same wire harness board are used for conductive connection with the terminal of the battery cell of the same polarity. An insulating layer is provided between the upper and lower wire harness boards.

2. The wire harness board assembly according to claim 1, characterized in that, The conductive sheets are arranged on both sides of the width direction of the wire harness plate, and the conductive sheets on both sides of the width direction of the same wire harness plate are arranged alternately in the length direction of the wire harness plate.

3. The wire harness board assembly according to claim 1 or 2, characterized in that, The insulating isolation layer is an insulating elastic buffer layer.

4. The wire harness board assembly according to claim 1 or 2, characterized in that, An insulating layer is also provided on the underside of the lower wiring harness board.

5. The wire harness board assembly according to claim 1 or 2, characterized in that, The wiring harness board assembly also includes a connector for connecting to the BMS, with both the upper and lower wiring harness boards connected to the same connector.

6. A battery pack comprising battery cells and a wiring harness assembly, characterized in that, The wiring harness board assembly includes an upper wiring harness board and a lower wiring harness board. Both the upper and lower wiring harness boards are equipped with power supply lines and information acquisition lines. The ends of the power supply lines are equipped with conductive plates that are conductively connected to the terminals of the battery cells. The conductive plates on the same layer of the wiring harness board are conductively connected to the terminals of the battery cells of the same polarity. An insulating layer is provided between the upper and lower wiring harness boards.

7. The battery pack according to claim 6, characterized in that, The conductive sheets are arranged on both sides of the width direction of the wire harness plate, and the conductive sheets on both sides of the width direction of the same wire harness plate are arranged alternately in the length direction of the wire harness plate.

8. The battery pack according to claim 6 or 7, characterized in that, The insulating isolation layer is an insulating elastic buffer layer.

9. The battery pack according to claim 6 or 7, characterized in that, An insulating layer is also provided on the underside of the lower wiring harness board.

10. The battery pack according to claim 6 or 7, characterized in that, The wiring harness board assembly also includes a connector for connecting to the BMS, with both the upper and lower wiring harness boards connected to the same connector.

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