Signal acquisition assembly and battery module

Abstract

The present application discloses a signal acquisition assembly and a battery module. The signal acquisition assembly comprises a plastic bracket, busbars, a first PCB, and FFC connecting wires; the busbars are arranged on the side surface of the plastic bracket away from a battery cell; the first PCB is arranged on the plastic bracket, and an AFE is integrated on the first PCB; and each FFC connecting wire is provided with an input end and an output end, the input end is connected to the busbar, and the output end is electrically connected to the AFE.

Description

Signal acquisition components and battery modules

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 12, 2023, with application number 202322483738.5. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a signal acquisition component and a battery module. Background Art

[0003] The main function of the signal acquisition component is to connect the battery cells in series and parallel to form a battery module, and to collect and transmit the battery voltage and temperature analog signals.

[0004] In related technologies, the voltage and temperature signals collected by the signal acquisition component will eventually be transmitted through cables to the AFE (Active Front End) module in the BMS (Battery Management System) and converted into digital signals. The BMS then processes the digital signals. The intermediate connection between the signal acquisition component and the AFE requires dozens or hundreds of cables. When the distance between the signal acquisition component and the AFE is too long, the accuracy of the transmitted temperature and voltage signals is easily disturbed. At the same time, a large number of transit cables are costly and have a high failure rate. SUMMARY OF THE INVENTION

[0005] The present application provides a signal acquisition component and a battery module to solve the above technical problems.

[0006] In a first aspect, an embodiment of the present application provides a signal acquisition component, which is applied to a battery module, the battery module includes a battery cell, and the signal acquisition component includes a plastic bracket, a bus, a first PCB board and an FFC connecting line; the bus is arranged and configured on a side of the plastic bracket facing away from the battery cell; the first PCB board is configured on the plastic bracket, and the AFE is integrated on the first PCB board; the FFC connecting line has an input end and an output end, the input end is connected to the bus, and the output end is electrically connected to the AFE.

[0007] In a second aspect, an embodiment of the present application provides a battery module comprising the above-mentioned signal acquisition board. Beneficial effects

[0008] The beneficial effects of the present application are as follows: the signal acquisition component provided by the present application integrates the AFE through the first PCB board, and realizes the connection between the FFC connecting line and the AFE through the first PCB board. Such a setting can effectively shorten the connection distance between the signal acquisition component and the AFE compared to the long-distance, multi-line connection method between the traditional FFC connecting line and the BMS, and can effectively reduce the interference of the signal in the process of being transmitted from the FFC connecting line to the AFE, thereby ensuring the accuracy of signal transmission; at the same time, the AFE converts the analog signal collected through the FFC connecting line into a digital signal at the signal acquisition component, so only two transfer cables are required in the process of transmitting this signal to the BMS. The number of transfer cables is small, the cost is low, and the two cables are easy to comb, which can greatly reduce the failure rate of this position.

[0009] The battery module provided in the present application adopts the above-mentioned signal acquisition board. The signal acquisition board integrates the AFE through the first PCB board, and realizes the connection between the FFC connecting line and the AFE through the first PCB board. Such a setting can effectively shorten the connection distance between the signal acquisition component and the AFE compared to the long-distance, multi-line connection method between the traditional FFC connecting line and the BMS, and can effectively reduce the interference of the signal in the process of being transmitted from the FFC connecting line to the AFE, thereby ensuring the accuracy of signal transmission; at the same time, the AFE converts the analog signal collected through the FFC connecting line into a digital signal at the signal acquisition component. Therefore, only two transfer cables are required in the process of transmitting this signal to the BMS. The number of transfer cables is small, the cost is low, and the two cables are easy to comb, which can greatly reduce the failure rate at this location. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic diagram of the three-dimensional structure of a signal acquisition component provided in an embodiment of the present application;

[0011] FIG2 is a partial enlarged schematic diagram of the structure at point A in FIG1 ;

[0012] FIG3 is a partial enlarged schematic diagram of the structure at point B in FIG1 ;

[0013] FIG4 is a partial enlarged schematic diagram of the structure at point C in FIG1 .

[0014] Description of reference numerals:

[0015] 1. Plastic bracket; 11. Extension bracket; 12. Limiting groove; 121. Accommodating groove; 13. Elastic clip; 131. Clipping protrusion; 14. Limiting column; 2. Bus; 21. Observation hole; 3. First PCB board; 31. First connector; 4. FFC connecting line; 41. Collection nickel sheet; 411. Nickel sheet extension; 412. Card connector; 5. Second PCB board; 6. Protective cover. Modes for Carrying Out the Invention

[0016] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0017] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0018] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0019] Referring to Figures 1 to 4, a signal acquisition component is applied to a battery module, comprising a plastic bracket 1, a bus 2, a first PCB board 3, and an FFC connecting line 4. The bus 2 is arranged on a side of the plastic bracket 1 facing away from the battery cell; the first PCB board 3 is disposed on the plastic bracket 1, and an AFE is integrated on the first PCB board 3; the input end of the FFC connecting line 4 is connected to the bus 2, and the output end of the FFC connecting line 4 is electrically connected to the AFE.

[0020] In this embodiment, the input end of the FFC connecting line 4 is provided with a collection nickel sheet 41, and the input end of the FFC connecting line 4 is connected to the bus 2 through the collection nickel sheet 41 for collecting voltage information of the battery cell; the AFE is integrated through the first PCB board 3, and the connection between the FFC connecting line 4 and the AFE is realized through the first PCB board 3. Such a setting can effectively shorten the connection distance between the signal acquisition component and the AFE compared to the long-distance, multi-line connection method between the traditional FFC connecting line 4 and the BMS (not shown in the figure), and can effectively reduce the interference suffered by the signal in the process of being transmitted from the FFC connecting line 4 to the AFE, thereby ensuring the accuracy of signal transmission; at the same time, the AFE converts the analog signal collected through the FFC connecting line 4 into a digital signal at the signal acquisition component. Therefore, only two transfer cables are required in the process of transmitting this signal to the BMS. The number of transfer cables is small, the cost is low, and the two cables are easy to comb, which can greatly reduce the failure rate of this position.

[0021] Specifically, in some embodiments, a first connector 31 is integrated on the first PCB board 3 for connecting to the BMS; the first connector 31 is electrically connected to the AFE. During use, the BMS is equipped with a second connector that mates with the first connector 31. The first connector 31 and the second connector are plugged together to connect the signal acquisition component to the BMS. Optionally, the first connector 31 and the second connector are two-core connectors.

[0022] As shown in Figure 2, an extension bracket 11 is mounted on the plastic bracket 1. The output end of the FFC cable 4 extends to the extension bracket 11, and the first PCB 3 is mounted on the extension bracket 11. In this embodiment, the extension bracket 11 and the plastic bracket 1 are integrally injection molded. Positioning the first PCB 3 on the extension bracket 11 prevents it from interfering with the layout and arrangement of the busbar 2 and FFC cable 4 on the plastic bracket 1, thus maintaining the neatness of the signal acquisition assembly.

[0023] In one embodiment, the extension bracket 11 is provided with a limiting post 14 that extends through the first PCB board 3 and is used to limit the position of the first PCB board 3. In this embodiment, the limiting post 14 may be a heat-riveted post. In another embodiment, the limiting post 14 may be coupled with a nut (not shown), specifically, the nut is threadedly connected to the limiting post 14 to secure the first PCB board 3 to the extension bracket 11.

[0024] The plastic bracket 1 is in the shape of a rectangular plate, and the extension bracket 11 is located at the end of the length direction of the plastic bracket 1. In this embodiment, the busbars 2 are arranged along the length direction of the plastic bracket 1, and the FFC connecting wires 4 are extended along the length direction of the plastic bracket 1.

[0025] As shown in Figure 3, a limiting structure is configured on the plastic bracket 1 to limit the bus 2. The limiting structure here is used to limit and fix the bus 2 on the plastic bracket 1 to achieve the integrated integration of the signal acquisition component.

[0026] Specifically, the limiting structure includes an elastic clip 13 provided on the plastic bracket 1, and a clip 131 is provided on the elastic clip 13; when the bus 2 is assembled to the plastic bracket 1, the bus 2 is located between the clip 131 and the plastic bracket 1. The elastic clip 13 here is integrally formed with the plastic bracket 1 and has the ability to elastically deform. When in use, when the bus 2 is assembled to the plastic bracket 1 and abuts against the clip 131, the elastic clip 13 is elastically deformed by force so that the bus 2 can move toward the plastic bracket 1 until the bus 2 is between the plastic bracket 1 and the clip 131. At this time, the elastic clip 13 is reset, and the clip 131 cooperates with the plastic bracket 1 to limit the bus 2. In some embodiments, the number of limiting structures can be multiple, and they can be distributed around the installation position of the bus 2.

[0027] In this embodiment, the plastic bracket 1 is provided with a retaining groove 12 adapted for the bus 2, and the bus 2 is embedded in the retaining groove 12. The retaining groove 12 is used to embed the bus 2, which can reduce the overall thickness of the signal acquisition assembly and facilitate the positioning and assembly of the bus 2 and the plastic bracket 1.

[0028] In some embodiments, at least a portion of the inner sidewall of the retaining groove 12 abuts against the corresponding busbar 2. That is, when the busbar 2 is assembled into the retaining groove 12, the inner sidewall of the retaining groove 12 can retain the busbar 2, acting as the aforementioned retaining structure. In this case, the aforementioned elastic clip 13 structure is optional.

[0029] For the convenience of description, in the following embodiments, the use of the limiting groove 12 in conjunction with the elastic clip 13 is taken as an example for explanation.

[0030] Specifically, as shown in Figure 3, a receiving groove 121 is formed on the inner sidewall of the limiting groove 12. An elastic retaining strip 13 is disposed within the receiving groove 121, and a retaining protrusion 131 is disposed on the elastic retaining strip 13. When the bus 2 is assembled into the limiting groove 12, the bus 2 is positioned between the retaining protrusion 131 and the bottom wall of the limiting groove 12. The receiving groove 121 can accommodate the elastic retaining strip 13, thereby reducing the thickness of the signal acquisition module. In this embodiment, the bus 2 can have a tight or loose fit with the inner wall of the limiting groove 12.

[0031] As shown in FIG3 , in this embodiment, an observation hole 21 is provided through the busbar 2. The observation hole 21 here can be used to conveniently observe the welding condition of the busbar 2 and the battery cell, for example, whether there is a cold solder joint between the busbar 2 and the battery cell.

[0032] In this embodiment, as shown in Figures 1 and 4, the signal acquisition component further includes a temperature sensor (not shown in the figures), which is mounted on at least one bus 2 and electrically connected to the FFC connection line 4. The temperature sensor is used to collect the temperature signal of the corresponding bus 2, i.e., the battery cell.

[0033] In some embodiments, the nickel sheet 41 of the temperature sensor is provided with a snap-in structure 7 for detachably connecting to the temperature sensor. The snap-in structure 7 facilitates the assembly and disassembly of the temperature sensor and facilitates maintenance of the temperature sensor during subsequent use.

[0034] Specifically, the clamping structure 7 includes two clamping plates 412, which are positioned opposite each other on the nickel collecting plate 41 on which the temperature sensor is mounted. A slot for the temperature sensor is formed between the two clamping plates 412. During use, the temperature sensor is simply inserted into the slot. In this embodiment, the clamping plates 412 optionally have elastic deformation capabilities, thereby providing a more secure grip on the temperature sensor while maintaining efficient removal.

[0035] More specifically, in some embodiments, the signal acquisition component further includes a second PCB board 5, which is mounted on the plastic bracket 1 and is arranged in a one-to-one correspondence with the acquisition nickel sheet 41 on which the temperature sensor is assembled; the acquisition nickel sheet 41 on which the temperature sensor is assembled is provided with a nickel sheet extension 411, and a snap-on sheet 412 is provided on the nickel sheet extension 411; the temperature sensor is electrically connected to the input end of the FFC connecting line 4 via the second PCB board 5. Optionally, the second PCB board 5 is snap-connected to the plastic bracket 1, either by screw connection or by heat rivet connection. The assembly of the second PCB board 5 with the plastic bracket 1 facilitates the precise assembly of the temperature sensor and the FFC connecting line 4, and the signal transmission line between the temperature sensor and the FFC connecting line 4 is secure, thereby ensuring the reliability of signal transmission between the temperature sensor and the FFC connecting line 4 during use.

[0036] As shown in Figure 2, in this embodiment, a fuse (not shown) is installed on the FFC cable 4, located near the first PCB 3. A protective cover 6 is installed on the first PCB 3, with the fuse located between the cover and the first PCB 3. The fuse serves as a safety feature. Specifically, if an insulation failure short-circuits the signal acquisition component, the fuse will fuse and terminate the short-circuit. The protective cover 6 protects the fuse from damage by external forces.

[0037] It should be noted that the protective cover 6 is made of a transparent material. Optionally, the material of the protective cover 6 includes but is not limited to transparent PC or transparent PVC.

[0038] This embodiment also provides a battery module comprising battery cells and the aforementioned signal acquisition assembly. Multiple battery cells are arranged along the length of a plastic support 1 and connected in series via a busbar 2. In this embodiment, busbar 2 extends through the plastic support 1 and connects to the battery cells. This battery module facilitates signal acquisition and accurately transmits signals to a battery management system (BMS), providing high safety.

Claims

1. A signal acquisition component, applied to a battery module, wherein the battery module comprises a battery cell, and the signal acquisition component comprises: Plastic bracket (1); A bus bar (2) arranged and configured on a side of the plastic support (1) away from the battery core; A first PCB board (3) is arranged on the plastic bracket (1), and an AFE is integrated on the first PCB board (3); and The FFC connection line (4) has an input end and an output end, wherein the input end is connected to the bus bar (2) and the output end is electrically connected to the AFE.

2. The signal acquisition component according to claim 1, wherein: The first PCB board (3) is integrated with a first connector (31), the first connector (31) is configured to be connected to a BMS, and the first connector (31) is electrically connected to the AFE.

3. The signal acquisition component according to claim 1, wherein: An extension bracket (11) is arranged on the plastic bracket (1), the output end of the FFC connecting line (4) extends to the extension bracket (11), and the first PCB board (3) is arranged on the extension bracket (11).

4. The signal acquisition component according to claim 3, wherein: The extension bracket (11) is provided with a limiting column (14), the limiting column (14) passes through the first PCB board (3), and the limiting column (14) is configured to limit the first PCB board (3).

5. The signal acquisition component according to claim 3, wherein: The extension bracket (11) and the plastic bracket (1) are integrally formed.

6. The signal acquisition component according to claim 1, wherein: The plastic support (1) is provided with a limiting structure, and the limiting structure is used to limit the bus (2).

7. The signal acquisition component according to claim 6, wherein: The limiting structure comprises an elastic clamping strip (13) arranged on the plastic bracket (1), and a clamping protrusion (131) is arranged on the elastic clamping strip (13); When the bus bar (2) is assembled to the plastic bracket (1), the bus bar (2) is located between the latching protrusion (131) and the plastic bracket (1).

8. The signal acquisition component according to claim 1, wherein: The plastic support (1) is provided with a limiting groove (12) adapted to the bus bar (2), and the bus bar (2) is embedded in the limiting groove (12).

9. The signal acquisition component according to claim 8, wherein: At least part of the inner side wall of the limiting groove (12) is tightly pressed against the corresponding bus bar (2).

10. The signal acquisition component according to claim 8 or 9, wherein: An accommodating groove (121) is provided on the inner side wall of the limiting groove (12), an elastic clamping strip (13) is arranged in the accommodating groove (121), and a clamping protrusion (131) is arranged on the elastic clamping strip (13); When the bus bar (2) is assembled into the limiting groove (12), the bus bar (2) is located between the latching protrusion (131) and the bottom wall of the limiting groove (12).

11. The signal acquisition component according to claim 1, wherein: The busbar (2) is penetrated by an observation hole (21).

12. The signal acquisition component according to claim 1, wherein: The signal acquisition component also includes a temperature sensor, which is installed on at least one of the bus bars (2) and is electrically connected to the FFC connecting line (4).

13. The signal acquisition component according to claim 12, wherein: The FFC connecting line (4) is connected to the busbar (2) via a current collecting nickel sheet (41); the current collecting nickel sheet (41) on which the temperature sensor is mounted is provided with a clamping structure (7); the clamping structure (7) is configured to be detachably connected to the temperature sensor.

14. The signal acquisition component according to claim 13, wherein: The clamping structure (7) comprises clamping sheets (412), wherein two clamping sheets (412) are arranged opposite to each other on the collecting nickel sheet (41) on which the temperature sensor is mounted, and a clamping groove is formed between the two clamping sheets (412), wherein the clamping groove is configured to clamp the temperature sensor.

15. The signal acquisition component according to claim 14, wherein: The signal acquisition component further comprises a second PCB board (5), the second PCB board (5) being mounted on the plastic bracket (1), and the second PCB board (5) being in one-to-one correspondence with the acquisition nickel sheet (41) on which the temperature sensor is mounted; The collection nickel sheet (41) on which the temperature sensor is mounted is provided with a nickel sheet extension portion (411), and the clamping sheet (412) is provided on the nickel sheet extension portion (411); The temperature sensor is electrically connected to the input end of the FFC connecting line (4) through the second PCB board (5).

16. The signal acquisition component according to claim 1, wherein: The FFC connecting line (4) is provided with a FUSE.

17. The signal acquisition component according to claim 16, wherein: The FUSE is close to the first PCB board (3); A protective cover (6) is arranged on the first PCB board (3), and the FUSE is located between the protective cover (6) and the first PCB board (3).

18. The signal acquisition component according to claim 17, wherein: The protective cover (6) is made of a transparent material.

19. A battery module, comprising the signal acquisition component according to any one of claims 1 to 18.

20. The battery module according to claim 19, wherein: The battery module further comprises a plurality of battery cells, and the plurality of battery cells are arranged along the length direction of the plastic support (1); The busbar (2) passes through the plastic support (1) and is connected to the plurality of battery cells, so that the plurality of battery cells are arranged in series.

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