Battery information sampling assembly, battery module and battery pack

Abstract

The battery information sampling assembly (10) includes a battery sampling control unit (13) and a flexible circuit board (12) that collects information of a corresponding cell (21) and is directly connected to the battery sampling control unit (13).

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to Chinese Patent Application No. “202011487832.2” filed by BYD Company Limited on December 16, 2020, entitled “Battery Information Sampling Assembly, Battery Module and Battery Pack.”

[0002] The present application relates to the technical field of batteries, and in particular to a battery information sampling assembly, a battery module and a battery pack. [Background technology]

[0003] With the development of new energy technology, battery modules / battery packs are being applied more and more widely. In order to ensure that the battery works normally, it is necessary to collect information such as the voltage and temperature of each cell in the battery module / battery pack and monitor the working status of each cell, so as to ensure the safe operation of the battery module / battery pack.

[0004] The conventional circuit board is connected to the battery sampling control unit through a wire harness, and the layout of the wire harness occupies the internal space of the battery module / battery pack, thereby reducing the energy density of the battery module / battery pack. In addition, the wire harness is easily in contact with related components in the battery module / battery pack, and when the battery module / battery pack is used in a vehicle, friction between the wire harness and related metal components occurs due to vibrations while the vehicle is running, and the wire harness is damaged due to vibration friction for a long time, which further affects the normal use and safety of the battery module / battery pack. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems in the prior art by providing a battery information sampling assembly that can improve the space utilization rate of a battery module and has higher operation stability.

[0006] The battery information sampling assembly includes a battery sampling control unit and a flexible circuit board that collects information of a corresponding single battery and is directly connected to the battery sampling control unit.

[0007] This eliminates the need to install an additional wire harness to connect the battery sampling control unit and the flexible circuit board, and by directly connecting the battery sampling control unit and the flexible circuit board in the battery information sampling assembly, the space utilization rate inside the battery module is improved and the energy density of the battery module or battery pack is improved, while at the same time avoiding the problem of the battery information collection assembly failing due to wear of the wire harness caused by external factors.

[0008] The battery module includes a battery cell, a battery holder installed on the battery cell, and the battery information sampling assembly.

[0009] The battery pack includes a battery cell, a battery holder installed on the battery cell, and the battery information sampling assembly.

[0010] Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief description of the drawings]

[0011] The above and / or additional aspects and advantages of the present application will become more apparent and easier to understand by describing examples with reference to the following drawings, in which:

[0012] [Figure 1]FIG. 2 is a perspective view of a battery information sampling assembly according to one embodiment of the present application. [Diagram 2] 1 is a cross-sectional view of a battery information sampling assembly according to an embodiment of the present application. [Diagram 3] 1 is a block diagram illustrating one aspect of a battery information sampling assembly according to an embodiment of the present application; [Figure 4] FIG. 2 is a block diagram of a battery and a battery information sampling assembly according to an embodiment of the present application. [Diagram 5] 2 is an assembly diagram of a single cell and a battery information sampling assembly of a battery module according to an embodiment of the present application. FIG. [Figure 6] 1 is a diagram illustrating a configuration of a battery pack according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the embodiments of the present application will be described in detail, and examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are only for interpreting the present application, and should not be understood as limiting the present application.

[0014] In addition, in the description of this application, the orientations or positional relationships indicated by the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate and simplify the description of this application, and do not indicate or suggest that the devices or parts shown must have a specific orientation and be configured and operate in a specific orientation, and therefore should not be understood as limiting this application.

[0015] It should be noted that the terms "first" and "second" are for explanatory purposes only and should not be understood to indicate or suggest a relative importance or to imply a number of technical features depicted. Thus, a feature qualified with "first" or "second" may explicitly or implicitly include one or more of the feature. Furthermore, in the description of this application, unless otherwise specified, "plurality" means two or more than two.

[0016] As shown in FIG. 1, the present application discloses a battery information sampling assembly 10 including a battery sampling control unit 13 and a flexible circuit board 12 that collects information of a corresponding single battery and is directly connected to the battery sampling control unit 13.

[0017] In the present application, there is no need to install an additional wire harness connecting the battery sampling control unit 13 and the flexible circuit board 12. By directly connecting the battery sampling control unit 13 to the flexible circuit board 12, the internal space utilization rate of the battery module 20 or the battery pack 100 is improved, and the energy density of the battery module 20 or the battery pack 100 is indirectly improved. At the same time, the problem of the battery information collection assembly failing due to wear of the wire harness caused by external factors is also avoided.

[0018] The flexible circuit boards 12 are provided in plurality, and the flexible circuit boards 12 are disposed at intervals and directly connected to the battery sampling control unit 13 .

[0019] The multiple flexible circuit boards 12 collect the battery information of each cell correspondingly, and then transmit it directly to the battery sampling control unit 13 .

[0020] As shown in FIG. 2, in the embodiment of the present application, the flexible circuit board 12 has an "arch bridge"-like structure that is generally upwardly protruding. By providing the "arch bridge"-like structure of the flexible circuit board 12, the occupied space of the battery information sampling assembly in the battery module or battery pack 100 can be reduced. The flexible circuit board 12 has an upwardly protruding, semicircular cross section. Curved Part 121 and Curved The flexible circuit board 12 includes a first connection portion 122 and a second connection portion 123 disposed on opposite sides of a portion 121. The flexible circuit board 12 is connected to the battery sampling control unit 13 via the first connection portion 122, and is connected to the single battery via the second connection portion 123.

[0021] In addition, the flexible circuit board 12 Curved The portion 121 is recessed downward. Curved The flexible circuit boards 12 may be arranged in a shape that is not specifically limited, and appropriate improvements and modifications according to the actual situation in the present application should be protected by the present application. Curved The first connection portions 121 of the flexible circuit boards 12 are spaced apart, and the first connection portions 122 of the multiple flexible circuit boards 12 are connected together. The first connection portions 122 of the multiple flexible circuit boards 12 are connected together and then connected to the battery sampling control unit 13. The design in which the first connection portions 122 of the multiple flexible circuit boards 12 are connected together can improve the connection reliability between the flexible circuit boards 12 and the battery sampling control unit 13.

[0022] Of course, the structure of the flexible circuit board 12 according to the present application is not limited to this, and in some other embodiments, the first connection portions 122 of the multiple flexible circuit boards 12 may be directly connected to the battery sampling control unit 13 alone.

[0023] In the embodiment of the present application, the number of the battery sampling control unit 13 is one, and the number of the flexible circuit boards 12 is multiple. For example, the number of the flexible circuit boards 12 is the same as the number of the single cells, and each flexible circuit board 12 collects the battery information of one corresponding single cell. This installation method can ensure that even if one flexible circuit board 12 breaks down, it will not affect the information collection of other single cells by the battery information sampling assembly 10. In addition, the connection method in which the flexible circuit boards 12 correspond one-to-one with the single cells can ensure that when some flexible circuit boards 10 break down, only the broken flexible circuit board 10 needs to be replaced, which is highly adaptable and reduces costs.

[0024] In another specific embodiment, the number of flexible circuit boards 12 does not match the number of cells, and the number of flexible circuit boards 12 is less than the number of cells, that is, one flexible circuit board 12 correspondingly collects battery information of multiple cells. For example, one flexible circuit board correspondingly collects battery information of two cells. The correspondence between the flexible circuit boards and the cells can be reasonably selected according to actual needs.

[0025] 1, in order to realize a quick connection between the battery information sampling assembly 10 and the single battery 21, the battery information sampling assembly 10 further includes a connector 11 that is mounted on a flexible circuit board 12 and connects to the single battery. The connector 11 is mounted on an end of the flexible circuit board 12 and is inserted into a receptacle 211 in the single battery 21 for assembly, thereby achieving an assembly connection between the battery information sampling assembly 10 and the single battery.

[0026] In the past, the battery information sampling assembly and the single cell were connected by welding, which was a complicated process and resulted in low assembly efficiency. The battery information sampling assembly 10 according to the present application is quickly connected to the single cell by the connector 11 mounted on the flexible circuit board 21, improving the assembly efficiency of the battery information sampling assembly 10. The flexible circuit board 12 is connected to the connector 11 via the second connection portion 123.

[0027] In one embodiment of the present application, one connector 11 is provided corresponding to each flexible circuit board 12, and one flexible circuit board 12 is capable of collecting information for one cell. In another embodiment of the present application, multiple connectors 11 are provided corresponding to each flexible circuit board 12, and one flexible circuit board 12 is capable of collecting information for multiple cells.

[0028] The number of connectors 11 installed on each flexible circuit board 12 may be more than one, for example, two, three or other numbers, and the specific number may be reasonably selected according to actual needs. The multiple connectors 11 are arranged side by side at regular intervals on the end of one flexible circuit board 12.

[0029] The arrangement of the multiple connectors 11 is not limited to this, and may be adaptively adjusted according to the arrangement of the unit cells so as to realize convenient and strong insertion between the connectors 11 and the unit cells.

[0030] 1 and 3, in the present application, the flexible circuit board 12 is welded to the battery sampling control unit 13, and the connector 11 is welded to the flexible circuit board 12. The copper sheet in the flexible circuit board 12 and the pins in the connector 11 are connected by brazing, and the pins drawn out from the battery sampling control unit 13 and the copper sheet in the flexible circuit board 12 are connected by brazing.

[0031] The method of connection between the flexible circuit board 12 and the battery sampling control unit 13 and the method of connection between the connector 11 and the flexible circuit board 12 are not limited to those described above.

[0032] The battery information sampling assembly 10 in the present application further includes a reinforcing plate (not shown) installed on the back side of the connector 11. The back side of the connector 11 is the side away from the unit cell. The reinforcing plate is fixedly connected to the flexible circuit board 12 after the flexible circuit board 12 is welded to the connector 11. The connector 11 is installed on one side of the flexible circuit board 12, and the reinforcing plate is installed on the other side of the flexible circuit board 12. The reinforcing plate is installed on the other side of the flexible circuit board 12 by adhesion. After the reinforcing plate and the flexible circuit board are adhered to each other, an adhesive is applied to the periphery of the reinforcing plate, the connector 11, and the flexible circuit board 12 to ensure a stronger connection between the reinforcing plate, the connector 11, and the flexible circuit board 12.

[0033] In one embodiment of the present application, the battery information sampling assembly 10 includes multiple reinforcing plates, one reinforcing plate being installed on the back side of each connector 11. information The sampling assembly includes a reinforcing plate, and each connector 11 is adhesively fixed to the reinforcing plate. information The sampling assembly includes a number of stiffener plates with a number of connectors 11 fixedly connected to each stiffener plate.

[0034] In the embodiment of the present application, the battery sampling control unit 13 is a BIC board (i.e., a battery information collector), and a positioning hole 131 and an engagement position 132 are provided on the BIC board. The battery information sampling assembly 10 is assembled by positioning the battery holder 22 and the battery information sampling assembly 10 via the positioning hole 131 provided on the battery sampling control unit 13. The engagement position 132 is a groove, and the buckle 221 of the battery holder 22 is fitted into the engagement position 132 to fix the battery information sampling assembly 10.

[0035] In the embodiment of the present application, there are four positioning holes 131 in the battery sampling control unit 13. There are multiple engagement positions 132, which are evenly spaced at regular intervals on the upper and lower edges of the battery sampling control unit 13. There are four engagement positions on the upper edge of the battery sampling control unit 13. There are four engagement positions on the lower edge of the battery sampling control unit 13. The specific number of engagement positions is not limited thereto and can be reasonably adjusted according to actual needs.

[0036] As shown in Figs. 4 and 5, the battery module 20 includes a plurality of unit cells 21 stacked in order, and a battery holder 22 is installed at the ends of the plurality of unit cells 21, and the ends of the plurality of unit cells 21 are inserted into the battery holder 22. The battery information sampling assembly is inserted and connected to the receptacle 211 of the unit cell 21 via the connector 11. One end of the assembly rod 23 is inserted into the positioning hole 131 of the battery sampling control unit 13, and the other end is inserted into the battery holder 22, thereby realizing the positioning and assembly of the battery sampling control unit 13. The number of the assembly rods 23 is plural, specifically, four. A buckle 221 is installed in the battery holder 22, and the buckle 221 is fitted into the engagement position 132 of the battery sampling control unit 13, thereby realizing the fixing of the battery sampling control unit. There is a certain gap between the flexible circuit boards 12 of the battery information sampling assembly, which defines the buckle avoidance position 14 of the battery holder 22, and some of the buckles 221 of the battery holder 22 pass through the buckle avoidance position 14 and then engage with the engagement position 132 on the upper edge of the battery sampling control unit 13 to realize the engagement function. After the battery information sampling assembly 10 is assembled to the battery holder 22, a protective cover (not shown) is assembled to the battery holder 22, thereby realizing protection of the battery information sampling assembly.

[0037] The battery information sampling assembly 10 of the present application collects battery parameter information such as the voltage and temperature of each internal battery 21 via a flexible circuit board 12, transmits the parameter information directly to a battery sampling control unit 13, and finally transmits the parameter information to a battery management system via the battery sampling control unit 13, thereby detecting the battery.

[0038] As shown in FIG. 6, a battery pack 100 includes the battery module 20 in the above embodiment.

[0039] The battery pack 100 according to the embodiment of the present application is sampling The battery information is collected based on the premise that the battery pack 100 includes at least one battery module 20 using the assembly 10 and information on a plurality of cells 21 of the plurality of battery modules 20 in the battery pack 100 is collected. sampling The assembly 10 has higher operational stability, and the safety of the battery pack 100 can be improved. sampling Since the arrangement position of the assembly 10 is more reasonable and the occupied space is more reasonable, the space utilization rate within the battery pack 100 can be indirectly improved, and the energy density of the battery pack 100 can be improved.

[0040] Although embodiments of the present application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purpose of the present application, and that the scope of the present application is limited by the claims and their equivalents.

Claims

1. A battery sampling control unit and a plurality of flexible circuit boards; Each of the flexible circuit boards collects information of a corresponding battery cell and is directly connected to the battery sampling control unit; Each of the flexible circuit boards includes a curved portion and a first connection portion and a second connection portion connected to the curved portion, the first connection portion and the second connection portion being connected to both sides of the curved portion, the flexible circuit board is connected to the battery sampling control unit via the first connection portion, and the flexible circuit board is connected to each of the single batteries via the second connection portion; A battery information sampling assembly, wherein the curved length between the first connection portion and the second connection portion of each of the curved portions is equal.

2. A battery information sampling assembly as described in claim 1, characterized in that the multiple flexible circuit boards are installed at intervals.

3. 3. The battery information sampling assembly according to claim 1, further comprising a connector mounted on the flexible circuit board, the second connection portion being connected to a single battery through the connector.

4. 4. The battery information sampling assembly according to claim 3, wherein the connector is a plurality of connectors, each of the flexible circuit boards being provided with one of the connectors corresponding thereto.

5. 4. The battery information sampling assembly of claim 3, wherein the flexible circuit board is welded to the battery sampling control unit, and the connector is welded to the flexible circuit board.

6. 4. The battery information sampling assembly according to claim 3, further comprising a reinforcing plate for reinforcing a connection between the flexible circuit board and the connector, the reinforcing plate being disposed on a rear side of the connector.

7. 7. The battery information sampling assembly according to claim 6, wherein the reinforcing plate is one, and the flexible circuit board has one side connected to the connector and the other side connected to the reinforcing plate.

8. The battery information sampling assembly according to any one of claims 1 to 7, characterized in that the battery sampling control unit is provided with a positioning hole for positioning the battery information sampling assembly when assembling it to a single battery.

9. A battery and a battery holder installed on the battery; A battery module comprising the battery information sampling assembly according to any one of claims 1 to 8.

10. A battery pack comprising the battery module according to claim 9.

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