Battery module sampling assembly and battery pack

Abstract

The battery module sampling assembly comprises at least one sampling unit and at least one wire harness unit, the sampling unit comprises a flexible circuit board and a first connector which are electrically connected with each other; the first connector is arranged at one end of the flexible circuit board; a plurality of signal sampling terminals are distributed on the edge of the flexible circuit board; the first connector and the plurality of signal sampling terminals are electrically connected through a circuit in the flexible circuit board; the plurality of signal sampling terminals are configured to be electrically connected with battery cells of the battery module and are used for acquiring state signals of the battery cells; the at least one sampling unit is configured to be electrically connected with the battery management system control panel through the at least one wire harness unit and is used for transmitting a sampling signal to the battery management system; the at least one wire harness unit comprises a second connector, and the second connector is connected with the first connector in a paired manner; the battery module comprises a battery cell fixing frame; and the flexible circuit board is configured to be directly fixed on the battery cell fixing frame. The installation is simple and convenient, and the cost is greatly reduced while the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of signal sampling, in particular to a battery module sampling assembly and a battery pack. Background Art

[0002] In an energy storage system, it is necessary to collect the individual voltages and temperatures of battery cells and transmit the collected signals to a battery management system. The electrical connection between the battery cells and the battery management system is achieved through a wire harness. Common connection methods include the following two. 1. Connect a wire and a metal connection terminal as the wire harness for collecting the voltage of the battery cell, and connect the wire, a temperature sensor device and the metal connection terminal as the wire harness for collecting the temperature of the battery cell. The wire harness is fixed to the battery cell by means of screws. 2. Use an integrated busbar (CCS) to achieve the electrical connection and sampling between the battery cell and the battery management system. The integrated busbar mainly consists of a signal acquisition component, a plastic structural component, a copper-aluminum busbar, etc., and is connected into a whole through processes such as hot pressing or riveting to achieve the high-voltage series-parallel connection of the battery cells and the functions of battery temperature sampling and battery cell voltage sampling.

[0003] The first method is relatively cumbersome in assembly and has low work efficiency. Especially during mass production, the production cost increases sharply and the work efficiency drops sharply. The second method requires mold opening for the support structure of the integrated busbar, which is time-consuming and costly in production. Summary of the Utility Model

[0004] This application provides a battery module sampling assembly and a battery pack in order to solve at least one of the above technical problems.

[0005] In a first aspect, an embodiment of this application provides a battery module sampling assembly, including at least one sampling unit and at least one wire harness unit;

[0006] The sampling unit includes a flexible circuit board and a first connector that are electrically connected to each other; the first connector is arranged at one end of the flexible circuit board; a plurality of signal sampling terminals are distributed on the edge of the flexible circuit board; the first connector and the plurality of signal sampling terminals are electrically connected through the circuit inside the flexible circuit board; the plurality of signal sampling terminals are configured to be electrically connected to the battery cells of the battery module for collecting the status signals of the battery cells;

[0007] The at least one sampling unit is configured to be electrically connected to a battery management system control board through the at least one wire harness unit for transmitting sampling signals to the battery management system; the at least one wire harness unit includes a second connector, and the second connector is paired and connected with the first connector;

[0008] The battery module includes a battery cell fixing frame; the flexible circuit board is configured to be directly fixed on the battery cell fixing frame.

[0009] In connection with the first aspect of the present application, in an alternative embodiment, the plurality of signal sampling terminals are evenly distributed on the edge of the flexible circuit board.

[0010] In connection with the first aspect of the present application, in an alternative embodiment, the plurality of signal sampling terminals include voltage sampling terminals and voltage-temperature sampling terminals.

[0011] In connection with the first aspect of the present application, in an alternative embodiment, the voltage sampling terminals and the voltage-temperature sampling terminals are distributed at intervals from each other.

[0012] In connection with the first aspect of the present application, in an alternative embodiment, the flexible circuit board is directly fixed on the battery cell fixing bracket by a riveting method.

[0013] In connection with the first aspect of the present application, in an alternative embodiment, the at least one sampling unit includes a first sampling unit and a second sampling unit.

[0014] In connection with the first aspect of the present application, in an alternative embodiment, the connectors of the first sampling unit and the connectors of the second sampling unit are different to achieve anti-misoperation.

[0015] In a second aspect, an embodiment of the present application provides a battery pack, including a plurality of battery cells, a battery cell fixing bracket, and the battery module sampling assembly described in any of the above aspects. The plurality of battery cells are installed in the battery cell fixing bracket, and the sampling unit is directly fixed on the battery cell fixing bracket.

[0016] In connection with the second aspect of the present application, in an alternative embodiment, it further includes: a battery management system control board, which is electrically connected to the sampling unit through a wire harness unit.

[0017] In connection with the second aspect of the present application, in an alternative embodiment, the sampling unit is directly fixed on the top surface of the battery cell fixing bracket.

[0018] When the battery module sampling assembly and the battery pack according to the embodiments of the present application collect the voltage and temperature of the battery cells, a flexible circuit board is used to replace the wire harness and the integrated bus bar, and the flexible circuit board is directly fixed on the battery cell fixing bracket. The installation is simple and convenient, the support components are omitted, and there is no need to mold the support components, which greatly reduces the cost while improving the work efficiency.

[0019] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of the battery pack provided by the embodiment of the present application;

[0022] Figure 2 Schematic diagram of the sampling unit provided by an embodiment of the present application;

[0023] Figure 3 Schematic diagram of the sampling unit provided by another embodiment of the present application;

[0024] Figure 4 Top view of the battery pack provided by the embodiment of the present application;

[0025] Figure 5 Schematic diagram of the wiring harness unit provided by the embodiment of the present application. Detailed implementation manners

[0026] To facilitate the understanding of the present application, the following will describe the present application more comprehensively with reference to the relevant accompanying drawings. Embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0028] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present application, the first resistor can be called the second resistor, and similarly, the second resistor can be called the first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0029] It can be understood that in the following embodiments, "connection", if there is an electrical signal or data transfer between the connected circuits, modules, units, etc., should be understood as "electrical connection", "communication connection", etc.

[0030] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / comprising", "has / including", etc. specify the presence of the stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0031] Reference Figures 1 - 3 , an embodiment of the present application provides a battery module sampling component, including at least one sampling unit and at least one wiring harness unit. The sampling unit includes a flexible circuit board and a first connector that are electrically connected to each other. The first connector is disposed at one end of the flexible circuit board. A plurality of signal sampling terminals are distributed on the edge of the flexible circuit board. The number of sampling units is determined according to the number of battery cells to be sampled. Figure 1 Two sampling units are shown in [reference], a first sampling unit 50 and a second sampling unit 51, and each sampling unit samples 16 battery cells respectively. Taking the first sampling unit 50 as an example, it includes a first flexible circuit board 502 and a first connector 40 that are electrically connected to each other. The first connector 40 is disposed at one end of the flexible circuit board 502. Optionally, the shape of the flexible circuit board 502 is rectangular or circular, and is selected according to the arrangement shape of the battery cells.

[0032] In a possible implementation manner, as Figure 2 shown, the flexible circuit board 502 is strip-shaped, and the connector 40 is disposed at one end of the flexible circuit board 502. Its setting position can be the left end or the right end of the flexible circuit board 502. A plurality of signal sampling terminals are distributed on the edge of the flexible circuit board. The connector 40 and the plurality of signal sampling terminals are electrically connected through a circuit (not shown in the figure) inside the flexible circuit board.

[0033] The plurality of signal sampling terminals are configured to be electrically connected to the battery cells 10 of the battery module for collecting the state signals of the battery cells. The plurality of signal sampling terminals are evenly distributed on the edge of the flexible circuit board. Optionally, the plurality of signal sampling terminals include voltage sampling terminals 501 and voltage and temperature sampling terminals 500. The voltage sampling terminals can be nickel sheets. The voltage and temperature sampling terminals 500 include NTC thermistors and nickel sheets. By evenly arranging the voltage and temperature sampling terminals 500, the sampling of the battery cell temperature is more balanced and accurate.

[0034] The voltage sampling terminals 501 and the voltage and temperature sampling terminals 500 are distributed at intervals. That is, a voltage and temperature sampling terminal 500 is disposed between every two voltage sampling terminals 501. Figure 3Another possible distribution of multiple signal sampling terminals is shown. The second sampling unit 51 includes a second flexible circuit board 512 and a third connector 41 that are electrically connected to each other. The third connector 41 is provided at one end of the second flexible circuit board 512. One or two voltage sampling terminals 501 are provided between every two voltage-temperature sampling terminals 500. In this way, the distribution of the voltage-temperature sampling terminals 500 is more uniform and the sampling is more accurate.

[0035] Optionally, the multiple signal sampling terminals are fixed to the cell pole through an aluminum bar 70. The fixing methods include laser welding, soldering, or screwing, etc.

[0036] At least one sampling unit is configured to be electrically connected to the battery management system control board 30 through at least one harness unit for transmitting the sampling signal to the battery management system. At least one harness unit includes a second connector, and the second connector is paired and connected with the first connector. Figure 1 A case including two harness units is shown, the first harness unit 80 and the second harness unit 81. The first harness unit 80 includes a first harness 800 and a second connector 801 connected to one end thereof. The second connector 801 is paired and plugged with the first connector 40. The second harness unit 81 includes a second harness 810 and a fourth connector 811. The fourth connector 811 is paired and plugged with the second connector 41.

[0037] The connectors of the first sampling unit and the second sampling unit are different to achieve anti-fooling. The anti-fooling implementation methods of the connectors include different models, different colors, different numbers of jacks, different jack shapes, etc. Correspondingly, the connectors of the first harness unit and the second harness unit also have anti-fooling attributes. As Figure 5 shown, the first connector 40 and the third connector 41 adopt different model connectors, or connectors of the same model with different key positions. The second connector 801 and the fourth connector 811 are paired with the first connector 40 and the third connector 41 respectively. The second connector 801 and the fourth connector 811 cannot be inserted into the first connector 40 and the third connector 41 when they are inserted in the wrong way. In this way, the uniqueness of the mutual insertion of the connectors is ensured, thus realizing the anti-fooling design and avoiding insertion errors during assembly.

[0038] Optionally, a fifth connector is provided at the other end of the harness unit, configured to be electrically connected to the battery management system control board 30. As Figure 5 shown, a fifth connector 802 is connected to the other end of the first harness unit 80; a sixth connector 812 is connected to the other end of the second harness unit 81. The fifth connector 802 and the sixth connector 812 are configured to be connected to the battery management system control board 30. Optionally, the battery management system control board 30 is a slave control board of the battery management system.

[0039] The number of sampling units and wiring harness units is adjusted according to the number of battery cells to be sampled. Taking Figure 1 as an example, each sampling unit samples 16 battery cells. If the battery module only includes 16 battery cells, only 1 sampling unit is required. Correspondingly, one wiring harness unit is required to match it; if the battery module includes 32 battery cells, 2 sampling units are required. Correspondingly, two wiring harness units are required to match it, and so on. It can be understood that the number of battery cells that each sampling unit can sample is not limited to 16 and can be adjusted according to needs.

[0040] The battery module includes a battery cell fixing frame. The battery cells are arranged in the battery cell fixing frame. Figure 1 A possible implementation manner of the battery cell fixing frame is shown, including an upper fixing frame 21 and a lower fixing frame 20. Placement grooves matching the surface shape of the battery cells are arranged inside the upper fixing frame 21 and the lower fixing frame 20, and the battery cells are fixed in the upper fixing frame 21 and the lower fixing frame 20. Optionally, the battery cells are cylindrical battery cells.

[0041] The flexible circuit board is configured to be directly fixed on the battery cell fixing frame. The so-called direct fixing means that the flexible circuit board is fixed in a way of direct contact with the battery cell fixing frame, without being fixed through intermediate components such as a support structure. Fixing holes 60 and 61 are arranged on the main bodies of the flexible circuit boards 502 and 512. The fixing methods include riveting, screws or buckles, etc. The riveting method is preferred, with simple assembly and high efficiency. Optionally, the battery module sampling assembly is directly fixed on the top surface of the battery cell fixing frame. Welding points are arranged on the outer edge of the flexible circuit board, and multiple signal sampling terminals are welded on the welding points to realize the electrical connection between the signal sampling terminals and the flexible circuit board. Optionally, the flexible circuit board is configured to be directly fixed on the top surface or side surface of the battery cell fixing frame, and preferably fixed on the top surface for convenient assembly.

[0042] In the case of using cylindrical battery cells, installation and fixation need to be carried out through the battery cell fixing frame. By directly fixing the flexible circuit board on the battery cell fixing frame, the installation is simple and convenient, the support components are omitted, and there is no need to mold the support components, which greatly reduces the cost while improving the work efficiency.

[0043] The embodiment of the present application also provides a battery pack, as Figure 1 shown, including a plurality of battery cells 10, a battery cell fixing frame and the battery module sampling assembly of any one of the above embodiments. The plurality of battery cells 10 are installed in the battery cell fixing frame, and the battery module sampling assembly is directly fixed on the battery cell fixing frame. Optionally, the battery cell fixing frame includes an upper fixing frame 21 and a lower fixing frame 20. Placement grooves (not shown in the figure) matching the surface shape of the battery cells are arranged inside the upper fixing frame 21 and the lower fixing frame 20, and the battery cells are fixed in the upper fixing frame 21 and the lower fixing frame 20. Optionally, the battery cells 10 are cylindrical battery cells or square battery cells.

[0044] The battery pack further includes: a battery management system control board 30, which is electrically connected to the sampling unit through a wiring harness unit, and the wiring harness unit and the sampling unit are connected in pairs through a connector. The sampling units 50 and 51 are directly fixed on the top surface of the battery cell fixing bracket. Figure 1 The case including two sampling units 50 and 51 is shown, and the wiring harness unit 80 and the wiring harness unit 81 are respectively connected in pairs with the sampling unit 50 and the sampling unit 51. It can be understood that the number of the wiring harness units and the sampling units is determined according to the number of battery cells to be sampled, and is not limited to Figure 1 the two groups shown, and can also be one group or more than three groups.

[0045] The relevant content of each unit in this embodiment can refer to the relevant content of the unit with the same reference numeral in any of the foregoing embodiments, and will not be elaborated here.

[0046] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0047] The above-described embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A battery module sampling assembly, characterized in that: comprising at least one sampling unit and at least one wiring harness unit; The sampling unit includes a flexible circuit board and a first connector electrically connected to each other; the first connector is arranged at one end of the flexible circuit board; a plurality of signal sampling terminals are distributed on the edge of the flexible circuit board; the first connector and the plurality of signal sampling terminals are electrically connected through the circuit inside the flexible circuit board; the plurality of signal sampling terminals are configured to be electrically connected to the battery cells of the battery module for collecting the status signals of the battery cells; The at least one sampling unit is configured to be electrically connected to the battery management system control board through the at least one wiring harness unit, and is used to transmit the sampling signal to the battery management system; the at least one wiring harness unit includes a second connector, and the second connector is mated and connected with the first connector; The battery module includes a battery cell fixing frame; the flexible circuit board is configured to be directly fixed on the battery cell fixing frame.

2. The battery module sampling assembly according to claim 1, characterized in that: The plurality of signal sampling terminals are evenly distributed on the edge of the flexible circuit board.

3. The battery module sampling assembly according to claim 2, characterized in that: The plurality of signal sampling terminals include a voltage sampling terminal and a voltage and temperature sampling terminal.

4. The battery module sampling assembly according to claim 3, characterized in that: The voltage sampling terminal and the voltage and temperature sampling terminal are spaced apart from each other.

5. The battery module sampling assembly according to claim 1, characterized in that: The flexible circuit board is directly fixed on the battery cell fixing frame by riveting.

6. The battery module sampling assembly according to claim 1, characterized in that: The at least one sampling unit includes a first sampling unit and a second sampling unit.

7. The battery module sampling assembly according to claim 6, characterized in that: The connector of the first sampling unit and the connector of the second sampling unit are different to achieve foolproofing.

8. A battery pack, characterized in that: It comprises a plurality of battery cells, a battery cell fixing frame and the battery module sampling assembly according to any one of claims 1 to 7, wherein the plurality of battery cells are installed in the battery cell fixing frame, and the sampling unit is directly fixed on the battery cell fixing frame.

9. The battery pack according to claim 8, characterized in that: Also includes: A battery management system control board is electrically connected to the sampling unit through the wiring harness unit.

10. The battery pack according to claim 8, characterized in that: The sampling unit is directly fixed on the top surface of the battery cell fixing frame.

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