Battery module, battery pack and vehicle

Abstract

The utility model discloses a battery module, a battery pack and a vehicle, and relates to the technical field of battery packs. The battery module comprises a battery cell, a battery cell management unit and a flexible circuit board, the flexible circuit board comprises a battery cell connection part used for being connected with the battery cell and a transmission part used for signal or electric energy transmission, the transmission part is connected with the battery cell management unit, and the transmission part is connected with the battery cell connection part. According to the battery module provided by the invention, the battery cell and the battery cell management unit are connected by using the flexible circuit board, so that the weight of the battery module is not excessively increased, the light weight of the battery module is favorably realized, and the power supply efficiency of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and more particularly, to a battery module, a battery pack having the battery module, and a vehicle having the battery pack. Background Art

[0002] In the related art, a battery pack includes battery cells and a battery cell management unit. The battery cell management unit is used to collect parameters of the battery cells, such as temperature, voltage, current, etc. Usually, a wire harness connector or a male-female terminal connector is used to connect the battery cell management unit and the battery cells. However, the wire harness connector or the male-female terminal connector is relatively heavy, which is not conducive to the lightweight design of the battery pack, and will increase the burden on the energy of the battery cells and reduce the power supply efficiency. Therefore, there is room for improvement. Summary of the Utility Model

[0003] The present application aims to at least partially solve one of the above technical problems in the prior art. To this end, the present application provides a battery module with a relatively light weight.

[0004] The present application also provides a battery pack having the above battery module.

[0005] The present application also provides a vehicle having the above battery pack.

[0006] The battery module according to an embodiment of the present application includes: battery cells, a battery cell management unit, and a flexible circuit board. The flexible circuit board includes a battery cell connection portion for connecting to the battery cells and a transmission portion for signal or power transmission. The transmission portion is connected to the battery cell management unit, and the transmission portion is connected to the battery cell connection portion.

[0007] According to the battery module of the embodiment of the present application, by using a flexible circuit board to connect the battery cells and the battery cell management unit, the weight of the battery module will not be increased too much, which is conducive to realizing the lightweight of the battery module and improving the power supply efficiency of the battery cells.

[0008] According to some embodiments of the present application, the transmission portion includes pins, the battery cell connection portion includes lines, the pins are connected to the battery cell management unit, the pins are connected to the lines, and the lines are connected to the battery cells.

[0009] According to some embodiments of the present application, both the pins and the lines are multiple. The multiple pins are all connected to the battery cell management unit, the pins are connected to the corresponding lines, and the lines are connected to the corresponding battery cells.

[0010] According to some embodiments of the present application, the multiple pins are located at the same end of the flexible circuit board.

[0011] According to some embodiments of the present application, the plurality of pins include welding pins and sampling pins. The welding pins are welded to the battery cell management unit, and the battery cell management unit has sampling points. The sampling pins are electrically connected to the sampling points.

[0012] According to some embodiments of the present application, there are a plurality of the battery cells, and one battery cell is connected to one or more of the circuits.

[0013] According to some embodiments of the present application, two adjacent battery cells are connected in series through a series connection component, and the series connection component is electrically connected to the circuit.

[0014] According to some embodiments of the present application, the battery module further includes a connection wire, and the series connection component is connected to the circuit through the connection wire.

[0015] The battery pack according to the second aspect embodiment of the present application includes one or more of the above-mentioned battery modules.

[0016] According to the battery pack of the embodiment of the present application, the battery module thereof connects the battery cells and the battery cell management unit by using a flexible circuit board, which will not excessively increase the weight of the battery module, is beneficial to realizing the light weight of the battery pack, improving the power supply efficiency of the battery cells, and increasing the endurance efficiency of the battery pack.

[0017] The vehicle according to the third aspect embodiment of the present application includes the above-mentioned battery pack.

[0018] According to the vehicle of the embodiment of the present application, the battery module of its battery pack connects the battery cells and the battery cell management unit by using a flexible circuit board, which will not excessively increase the weight of the battery module, is beneficial to realizing the light weight of the battery pack, improving the power supply efficiency of the battery cells, and increasing the endurance efficiency of the battery pack.

[0019] The additional aspects and advantages of the present application will be partly given in the following description, partly become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0020] Figure 1 is a schematic diagram of a battery module according to an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of a flexible circuit board according to an embodiment of the present application;

[0022] Figure 3 is a connection schematic diagram of a flexible circuit board and a battery cell management unit according to an embodiment of the present application.

[0023] Reference Signs:

[0024] Battery module 100, battery cell 1, battery cell management unit 2, flexible circuit board 3, pin 31, welding pin 311, sampling pin 312, first series component 41, second series component 42, third series component 43, fourth series component 44, fifth series component 45, sixth series component 46, seventh series component 47, eighth series component 48, ninth series component 49, first connecting wire 51, second connecting wire 52, third connecting wire 53, fourth connecting wire 54, fifth connecting wire 55, sixth connecting wire 56, seventh connecting wire 57, eighth connecting wire 58, ninth connecting wire 59. Detailed implementation manners

[0025] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0026] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] The following will be combined with Figures 1-3 Describe in detail the battery module 100 according to the embodiments of the present application, the battery pack having the battery module 100, and the vehicle having the battery pack.

[0028] Refer to Figures 1-3 As shown, the battery module 100 according to the embodiments of the present application may include a battery cell 1, a battery cell management unit 2, and a flexible circuit board 3. The flexible circuit board 3 includes a battery cell connection portion and a transmission portion. The battery cell connection portion is used to connect to the battery cell 1, and the transmission portion is used for signal or power transmission. The transmission portion is connected to the battery cell management unit 2 and the battery cell connection portion. The battery cell 1 is connected to the battery cell management unit 2 through the battery cell connection portion and the transmission portion. The signal of the battery cell 1 can be transmitted to the battery cell management unit 2 through the battery cell connection portion and the transmission portion, so as to facilitate the battery cell management unit 2 to collect the signal of the battery cell 1. Specifically, the battery cell connection portion may be directly connected to the connection terminal of the battery cell 1 or indirectly connected by using a connecting wire. The transmission portion and the battery cell management unit 2 may be directly connected or indirectly connected by using a connecting wire.

[0029] In some embodiments, the flexible circuit board 3 is in a strip-shaped structure. One end of the flexible circuit board 3 is connected to the battery cell 1, and the other end of the flexible circuit board 3 is connected to the battery cell management unit 2. Specifically, one end of the flexible circuit board 3 can be directly connected to the connection terminal of the battery cell 1, or can be indirectly connected by using a connecting wire. The other end of the flexible circuit board 3 can be directly connected to the battery cell management unit 2, or can be indirectly connected by using a connecting wire.

[0030] The battery cell management unit 2 is also called CMU (cell monitor unit) and is used to measure parameters of the battery cell 1, such as voltage, current, and temperature. Using the flexible circuit board 3 to connect the battery cell 1 and the battery cell management unit 2 enables the battery cell management unit 2 to measure the parameters of the battery cell 1 and meet the usage requirements. Refer to Figure 1 As shown, the F1 end of the flexible circuit board 3 is connected to the battery cell 1, and the F2 end of the flexible circuit board 3 is connected to the battery cell management unit 2.

[0031] The flexible circuit board 3 is flexible and bendable, so that when the battery cell 1 and the battery cell management unit 2 are connected to the flexible circuit board 3, the direction of the flexible circuit board 3 can be adjusted, thereby meeting the installation requirements in multiple directions and realizing connection at any angle according to different direction requirements.

[0032] In the related art, a wire harness connector or a male-female terminal connector is used to connect the battery cell management unit and the battery cell. Both the wire harness connector and the male-female terminal connector include a rigid connector head. The rigid connector head is relatively heavy, which is not conducive to the lightweight design of the battery pack, and will increase the burden on the energy of the battery cell and reduce the power supply efficiency. Generally, a battery pack will include more than a dozen battery cell management units. If a wire harness connector or a male-female terminal connector is used, the number of rigid connector heads will increase significantly, and the corresponding device and process costs will increase greatly. According to the battery module 100 of the embodiments of the present application, by using the flexible circuit board 3 to connect the battery cell 1 and the battery cell management unit 2 and not setting a rigid connector head, the weight of the battery module 100 will not be increased too much, which is conducive to realizing the lightweight of the battery module 100 and improving the power supply efficiency of the battery cell 1. In addition, the wire harness connector or the male-female terminal connector adopted in the related art battery pack has a high cost, while the flexible circuit board 3 adopted in the battery module 100 of the present application has a low cost. It not only reduces the connector material cost, but also reduces the assembly steps.

[0033] In some embodiments of the present application, refer to Figures 1-3 As shown, the transmission part includes pins 31, and the battery cell connection part includes a circuit. The pins 31 are also called pin feet. One end of the pins 31 is connected to the battery cell management unit 2, the other end of the pins 31 is connected to the circuit, and the circuit is connected to the battery cell 1. In this way, the signal of the battery cell 1 can be transmitted to the battery cell management unit 2 through the circuit and the pins 31.

[0034] Optionally, the flexible circuit board 3 can be a flexible printed circuit (FPC for short). The circuit is printed on the substrate of the flexible circuit board 3, and the substrate is made of a soft material that can be bent arbitrarily, so that the direction of the flexible circuit board 3 can be adjusted to meet the installation requirements in multiple directions. Alternatively, optionally, the flexible circuit board 3 includes a circuit and a coating layer. The coating layer is coated outside the circuit, which can protect the circuit. At the same time, the coating layer is relatively soft and can be bent arbitrarily, so that the direction of the flexible circuit board 3 can be adjusted to meet the installation requirements in multiple directions.

[0035] In some embodiments of the present application, referring to Figure 1 , Figure 3 as shown, there are multiple pins 31 and multiple circuits. All the multiple pins 31 are connected to the battery cell management unit 2. The pins 31 are connected to the corresponding circuits, and the circuits are connected to the corresponding battery cells 1.

[0036] In the related art, the connectors used are standard products, the number of pins is fixed, and it is impossible to ensure that the number of pins matches the number of battery cells. Moreover, the pin arrangement is also fixed and cannot meet various spatial layouts. The number of pins 31 of the flexible circuit board 3 of the present application can be selected according to actual sampling requirements. For example, in the Figures 1-2 example, the number of pins 31 is 7; in the Figure 3 example, the number of pins 31 is 11. For the multiple pins 31, all the pins 31 can be connected to the battery cell management unit 2, or a part of the pins 31 can be connected to the battery cell management unit 2, while the other part of the pins 31 is idle. In some embodiments not shown in the figure, the number of pins 31 can also be other values, such as 20, 43, 56, etc. The arrangement of the multiple pins 31 can also be selected according to actual sampling requirements. For example, the multiple pins 31 can be a Figures 1-3 single-row structure as shown, or a multi-row structure such as two rows or three rows.

[0037] In some embodiments of the present application, the multiple pins 31 are located at the same end of the flexible circuit board 3. Thus, the connection between the pins 31 and the battery cell management unit 2 can be completed at the same end of the flexible circuit board 3, which is convenient for wiring and helps save time. Referring to Figures 1-3 as shown, all the multiple pins 31 are located at the F2 end of the flexible circuit board 3.

[0038] In some embodiments of the present application, the multiple pins 31 include welding pins 311 and sampling pins 312. The welding pins 311 are welded to the battery cell management unit 2, and the battery cell management unit 2 has sampling points. The sampling pins 312 are electrically connected to the sampling points. That is to say, the welding pins 311 only play a role in welding and fixing, and do not play a sampling role. The sampling pins 312 play a sampling role, thereby preventing the welding operation at the welding pins 311 from affecting the sampling accuracy. The direct welding method is used to connect the pins 31 to the battery cell management unit 2, and the connection is firm and the operation is simple.

[0039] In some embodiments of the present application, referring to Figure 1 as shown, there are multiple battery cells 1, and one battery cell 1 is connected to one or more lines. Specifically, the number of pins 31 required can be determined according to the number of parameters to be collected from the battery cell 1. The pins 31 correspond to the lines one by one, and each parameter of the battery cell 1 corresponds to one line. For example, when it is necessary to collect the temperature and voltage of the battery cell 1, the battery cell 1 is connected to two lines, one line is used to collect the temperature of the battery cell 1, and the other line is used to collect the voltage of the battery cell 1. Another example is that when only the current of the battery cell 1 needs to be collected, the battery cell 1 is connected to one line, and this line is used to collect the current of the battery cell 1.

[0040] In some embodiments of the present application, two adjacent battery cells 1 are connected in series through a series component, and the series component is electrically connected to the line, thereby realizing the indirect connection between the battery cell 1 and the line. The series component can conduct electricity to electrically connect the battery cell 1 and the line.

[0041] In Figure 1 the example, there are ten battery cells 1, specifically the first battery cell 11, the second battery cell 12, the third battery cell 13, the fourth battery cell 14, the fifth battery cell 15, the sixth battery cell 16, the seventh battery cell 17, the eighth battery cell 18, the ninth battery cell 19, and the tenth battery cell 10. The first battery cell 11 and the second battery cell 12 are connected in series through the first series component 41, the second battery cell 12 and the third battery cell 13 are connected in series through the second series component 42, the third battery cell 13 and the fourth battery cell 14 are connected in series through the third series component 43, the fourth battery cell 14 and the fifth battery cell 15 are connected in series through the fourth series component 44, the fifth battery cell 15 and the sixth battery cell 16 are connected in series through the fifth series component 45, the sixth battery cell 16 and the seventh battery cell 17 are connected in series through the sixth series component 46, the seventh battery cell 17 and the eighth battery cell 18 are connected in series through the seventh series component 47, the eighth battery cell 18 and the ninth battery cell 19 are connected in series through the eighth series component 48, and the ninth battery cell 19 and the tenth battery cell 10 are connected in series through the ninth series component 49, thereby realizing the series connection of ten battery cells 1.

[0042] Optionally, the series component can be a series plate or a series wire.

[0043] In some embodiments of the present application, the battery module 100 further includes connection lines. The series components are connected to the circuit through the connection lines, thereby achieving an indirect connection between the battery cells 1 and the circuit. Both the connection lines and the series components can conduct electricity to electrically connect the battery cells 1 and the circuit. The first series component 41 is connected to the circuit through the first connection line 51, the second series component 42 is connected to the circuit through the second connection line 52, the third series component 43 is connected to the circuit through the third connection line 53, the fourth series component 44 is connected to the circuit through the fourth connection line 54, the fifth series component 45 is connected to the circuit through the fifth connection line 55, the sixth series component 46 is connected to the circuit through the sixth connection line 56, the seventh series component 47 is connected to the circuit through the seventh connection line 57, the eighth series component 48 is connected to the circuit through the eighth connection line 58, and the ninth series component 49 is connected to the circuit through the ninth connection line 59.

[0044] In some embodiments of the present application, the series components can be directly connected to the circuit without being transferred through the connection lines.

[0045] The battery pack according to the second aspect embodiment of the present application includes the battery module 100 of the above embodiment. Optionally, the battery module 100 can be one or more.

[0046] For the battery pack according to the embodiment of the present application, its battery module 100 connects the battery cells 1 and the battery cell management unit 2 by using the flexible circuit board 3, which will not excessively increase the weight of the battery module 100, is beneficial to realizing the light weight of the battery module 100, improving the power supply efficiency of the battery cells, and increasing the endurance efficiency of the battery pack.

[0047] The vehicle according to the third aspect embodiment of the present application includes the battery pack of the above embodiment.

[0048] For the vehicle according to the embodiment of the present application, its battery module 100 of the battery pack connects the battery cells 1 and the battery cell management unit 2 by using the flexible circuit board 3, which will not excessively increase the weight of the battery module 100, is beneficial to realizing the light weight of the battery pack, improving the power supply efficiency of the battery cells, and increasing the endurance efficiency of the battery pack.

[0049] In the present application, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0050] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0051] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A battery module, characterized in that: include: Battery cell (1); Battery cell management unit (2); and A flexible circuit board (3), the flexible circuit board (3) comprising a cell connection portion for connecting to the cell (1) and a transmission portion for transmitting signals or electric energy, the transmission portion being connected to the cell management unit (2).

2. The battery module according to claim 1, characterized in that: The transmission part comprises a pin (31), the battery cell connection part comprises a circuit, the pin (31) is connected to the battery cell management unit (2), the pin (31) is connected to the circuit, and the circuit is connected to the battery cell (1).

3. The battery module according to claim 2, characterized in that: There are multiple pins (31) and multiple circuits, and each of the multiple pins (31) is connected to the battery management unit (2). The pins (31) are connected to the corresponding circuits, and the circuits are connected to the corresponding battery cells (1).

4. The battery module according to claim 3, characterized in that: The plurality of pins (31) are located at the same end of the flexible circuit board (3).

5. The battery module according to claim 3, characterized in that: The plurality of pins (31) include welding pins (311) and sampling pins (312); the welding pins (311) are welded to the battery cell management unit (2); the battery cell management unit (2) has sampling points; and the sampling pins (312) are electrically connected to the sampling points.

6. The battery module according to claim 3, characterized in that: There are a plurality of battery cells (1), and one battery cell (1) is connected to one or more of the circuits.

7. The battery module according to claim 6, characterized in that: Two adjacent battery cells (1) are connected in series via a series connection member, and the series connection member is electrically connected to the circuit.

8. The battery module according to claim 7, characterized in that: The battery module further includes a connecting line, and the series connection element is connected to the circuit via the connecting line.

9. A battery pack, characterized in that: A battery module comprising one or more of any one of claims 1-8.

10. A vehicle, characterized in that: A battery pack comprising the battery pack of claim 9.

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