Collection assembly, battery module and battery case

Abstract

The present application discloses a collection assembly, a battery module and a battery case.SOLUTION: The FPC collection plate (4) includes a FPC collection body (41) fixedly connected to the top of the expansion beam and connected to an end of the collection line (3), a connection part (42) connected to the connector (5), and a redundancy part (43) having two ends respectively connected to the FPC collection body (41) and the connection part (42), and the connector (5) is connected to the BMS slave board.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application bearing application number 202421858169.6, filed with the China Patent Office on August 1, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of batteries, for example, harvesting assemblies, battery modules, and battery cases. [Background technology]

[0003] The Cell Contact System (CCS) is an integrated battery signal acquisition (e.g., temperature acquisition, pressure acquisition, current acquisition, etc.) and management system. The CCS is mainly composed of a plastic bracket, an acquisition assembly, and a conductive bus bar (aluminum bar).

[0004] A CCS that uses a flexible flat cable (FFC) as the sampling wiring mainly comprises a printed circuit board (PCB) sampling board, an FFC sampling wiring, a connector, etc. The connector and FFC sampling wiring are welded to the PCB sampling board, the FFC sampling wiring is connected to the connector, and the connector is connected to the Battery Management System (BMS) slave board by direct insertion. Summary of the Invention [Problem to be solved by the invention]

[0005] This type of CCS has the following defects: The PCB collection board at the front end of the CCS needs to have the connector and collection wiring welded to it, so it is large in size and generates large amplitudes during vibration, which makes it easy for stress to concentrate on the connector pins welded to the PCB collection board, raising the risk of the pins breaking and the collection being lost. [Means for solving the problem]

[0006] The present application provides a collection assembly that can avoid a situation in the collection plate of a CCS where vibration causes the fillet between the connector and the collection plate to break, resulting in loss of collection.

[0007] The collection assembly is applied to a battery module installed in a battery case having a plurality of expansion beams arranged at intervals, wherein a space configured to accommodate the battery module is formed between adjacent two of the expansion beams, and a BMS slave board is fixed to the side thereof. The collection assembly includes an insulating bracket, collection wiring attached to the insulating bracket, a flexible printed circuit (FPC) collection plate, and a connector. The FPC collection plate includes an FPC collection body fixedly connected to the top of the expansion beam and electrically connected to an end of the collection wiring, a connection portion connected to the connector, and a redundant portion whose both ends are connected to the FPC collection body and the connection portion, respectively. The connector is connected to the BMS slave board.

[0008] The present application provides a battery module, and by using the above-mentioned collection assembly, the usage performance and stability of the entire battery module can be improved.

[0009] The battery module includes a battery cell and the above-mentioned collection assembly electrically connected to the battery cell.

[0010] The present application provides a battery case, and by using the above battery module, the service life of the battery case can be extended, the number of inspections and repairs can be reduced, and inspection and repair costs can be saved.

[0011] The battery case comprises a case body having a plurality of spaced apart expansion beams disposed therein, and the above-mentioned battery module, wherein a space configured to accommodate the battery module is formed between two adjacent expansion beams, and a BMS slave board is fixed to the side, and the collection assembly in the battery module comprises an FPC collection plate fixedly connected to the top of the expansion beam, and the connector in the collection assembly is connected to the BMS slave board. [Effects of the Invention]

[0012] The beneficial effects of the pickup assembly of the present application are as follows: By fixing the FPC pickup body to the expansion beam of the case body, the mounting stability of the FPC pickup plate is effectively improved, stress concentration on the connector pins on the FPC pickup plate is alleviated, and the connector pins on the FPC pickup plate are prevented from breaking. Furthermore, this connection method is convenient and fast. Furthermore, pickup plates made of FPC material are flexible, lightweight, and bendable, thereby achieving a deformable function. When the expansion beam is bent and deformed due to the expansion force of the battery cell, the redundant portion of the FPC pickup plate can absorb the deformation caused by the deformation of the expansion beam, preventing the relative distance between the connector welded to the expansion beam and the BMS slave board from changing. This prevents the occurrence of relative displacement between the two, avoiding the situation where the connection between the connector and the BMS slave board is lost, and preventing the pickup from failing.

[0013] The beneficial effects of the battery module according to the present application are as follows: the battery module includes the above-mentioned collection assembly, and the collection assembly has an FPC collection plate fixedly connected to the expansion beam on the case body of the battery case, which not only ensures the stable installation of the FPC collection plate and prevents the connector pin on the FPC collection body from breaking, but also allows the redundant part on the FPC collection plate to absorb the deformation of the expansion beam, thereby keeping the relative distance between the connector and the BMS slave board constant and stabilizing the connection between the connector and the BMS slave board, further ensuring the effective collection of the BMS slave board, and improving the usage performance and stability of the entire battery module.

[0014] The beneficial effects of the battery case according to the present application are as follows: The battery case body has spaced expansion beams defining a space for placing the battery modules, and the FPC collection plate of the battery module is fixedly connected to the expansion beams. By replacing the rigid PCB with the FPC collection plate and fixedly connecting the FPC collection plate to the expansion beams, on the one hand, it is possible to effectively reduce the vibration of the FPC collection plate and reduce the risk of the connector pins of the FPC collection body being subjected to concentrated stress and breaking; on the other hand, when the expansion beams are deformed, the redundant parts of the FPC collection plate can absorb the distortion caused by the expansion beams, ensuring the stability of the relative distance between the BMS slave board and the connector, and ensuring the stability and reliability of the connection between the connector and the BMS slave board, thereby extending the service life of the battery case, reducing the number of inspections and repairs, and saving inspection and repair costs. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a structural schematic diagram of a collection assembly according to an embodiment of the present application. [Figure 2] 1 is a front view of a partial structure of a collection assembly according to an embodiment of the present application. [Figure 3] FIG. 2 is a partial enlarged view of a portion A in FIG. [Figure 4] FIG. 1 is a plan view of a structure in which two collection assemblies according to an embodiment of the present application are connected in an intermediate manner. [Figure 5] FIG. 5 is a partial enlarged view of a portion B in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present application will be described in more detail below with reference to the drawings and examples. It will be understood that the specific examples described here are merely for the purpose of understanding the present application and are not intended to limit the present application. For ease of explanation, the drawings show only a portion of the present application, not all of the structures.

[0017] In the description of this application, unless otherwise clearly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or integration, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interaction between two elements. Those skilled in the art can understand the meaning of the above terms in this application depending on the context.

[0018] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, a first feature being "above," "above," and "on the upper surface" of a second feature may include the first feature being directly above and diagonally above the second feature, or the first feature having a higher horizontal height than the second feature. A first feature being "below," "below," and "on the lower surface" of a second feature may include the first feature being directly below and diagonally below the second feature, or the first feature having a lower horizontal height than the second feature.

[0019] In the description of the present embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are merely used to facilitate the description and simplify the operation. They do not indicate or imply that the referenced devices or elements must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are merely used to distinguish between the two in the description and do not have any special meaning.

[0020] The collection assembly, battery module, and battery case according to the present application will be described below with reference to the drawings and specific embodiments.

[0021] In the related art, a battery case includes a case body and a battery module. To accommodate expansion of the battery module's end, a plurality of expansion beams are provided at intervals within the case body. A space capable of accommodating the battery module is formed between two adjacent expansion beams. The relatively large-area surfaces of the expansion beams face the large surface of the battery module, allowing the expansion beams to withstand expansion forces along the end of the battery module (i.e., the normal direction of the large surface of the battery module) and reduce deformation along the end of the battery module. A BMS slave board 100 is further fixed to the relatively large-area surface of the expansion beam. The battery module includes battery cells and a collection assembly 10. The battery cells are electrically connected to the collection assembly 10. The BMS slave board 100 is electrically connected to the collection assembly 10 to monitor and collect signals such as the voltage, temperature, and current of the battery cells.

[0022] As shown in Figure 1, the collection assembly 10 includes a busbar 1, an insulating bracket 2, a collection wiring 3, a collection plate, and a connector 5. The busbar 1 is attached to the insulating bracket 2, which is configured to insulate and isolate the busbar 1 and the portions of the output stage not electrically connected to the battery cells from the battery cells. The insulating bracket 2 can be made of a polycarbonate (PC) plate, a PC + acrylonitrile-butadiene-styrene copolymer (ABS) plate, an epoxy plate, or other material, but this application is not limited to this. The collection wiring 3 is attached to the insulating bracket 2, and one end of the collection wiring 3 is electrically connected to the busbar 1 and the other end is electrically connected to the collection plate, so that signals such as the voltage, temperature, and current of the collected battery cells are transmitted to the FPC collection plate 4. The collection board is usually made of a PCB rigid board, and the connector 5 and collection wiring 3 are connected to the PCB rigid board by welding, and the connector 5 is connected to the BMS slave board 100, thereby achieving the purpose of transmitting signals from the battery cells to the BMS.

[0023] However, since the PCB rigid board needs to have the connector 5 and the sampling wiring 3 welded to it, it is usually large in size and generates large amplitudes during the vibration process, which makes it easy for stress to concentrate on the pins of the connector 5 welded to the PCB rigid board, and there is a risk that the pins will break and the sampling will be invalid.

[0024] In this embodiment, the collection plate adopts an FPC collection plate 4, and as shown in Figures 1 and 2, the FPC collection plate 4 comprises an FPC collection body 41, a connection part 42 and a redundant part 43, the FPC collection body 41 is fixedly connected to the top of the expansion beam, the end of the collection wiring 3 is welded to the FPC collection body 41 and electrically connected, the connection part 42 is connected to the connector 5, and both ends of the redundant part 43 are connected to the FPC collection body 41 and the connection part 42 respectively.

[0025] In the above installation, the FPC collection body 41 is fixed to the expansion beam of the case body, and since the expansion beam is often fixed to the case body, it can perform a cushioning effect when subjected to vibration or impact, reducing the interference of external forces with the FPC collection body 41 and preventing large amplitudes from occurring in the FPC collection body 41, effectively improving the installation stability of the FPC collection body 41, eliminating concentrated stress on the pins of the connector 5 of the FPC collection body 41, and ensuring that the pins of the connector 5 on the FPC collection board will not be broken, and furthermore, this connection method is convenient and fast.

[0026] In this embodiment, the redundant part 43, the connecting part 42, and the FPC extraction body 41 are integrally molded, and all three are made of FPC material. Extraction boards made of FPC material are flexible, lightweight, and bendable, which gives the redundant part 43 a deformable function. When the expansion beam is bent and deformed by the expansion force of the battery cells, it moves forward, simultaneously carrying the BMS slave board 100, the connector 5, and the connecting part 42. At this time, the redundant part 43 can absorb the deformation of the expansion beam by bending, so that the relative distance between the connector 5 welded to the expansion beam and the BMS slave board 100 does not change, thereby preventing relative displacement between the two and avoiding a situation where the connection between the connector 5 and the BMS slave board 100 is lost, thereby preventing extraction failure.

[0027] The connection portion 42 is provided with a piercing terminal, which is connected to the connector 5, so that the FPC collection plate 4 can be collected and connected by being directly inserted into the plastic shell of the connector 5, eliminating the step of welding the connector 5 and the FPC collection body 41, simplifying the process and reducing production costs.

[0028] The extraction wiring 3 is an FFC circuit, which has the advantages of good flexibility and thin thickness, a relatively simple structure, and lower mold costs than an FPC circuit, offering cost advantages. Of course, in other embodiments, the extraction wiring 3 may be a flexible die-cutting circuit (FDC) circuit. Compared with an FPC circuit, an FDC circuit requires fewer processing steps, a shorter processing cycle, and higher efficiency, thereby effectively reducing processing costs. Therefore, both FFC circuits and FDC circuits fall within the scope of protection of the present application.

[0029] As shown in FIG. 3 , the FFC circuit comprises a wiring body 31 and a bent segment 32, of which the wiring body 31 is attached to the insulating bracket 2, the bent segment 32 is located at the end of the wiring body 31 and is electrically connected to the FPC collection plate 4, a negative temperature coefficient (NTC) assembly for collecting temperature information at the terminal post of the battery cell may be further connected to the side of the wiring body 31 by means of thermally conductive structural adhesive, soldering, etc., and the bent segment 32 comprises two parts, a first bent portion 321 and a second bent portion 322, of which one end of the first bent portion 321 is connected to the end of the wiring body 31 and the other end is connected to one end of the second bent portion 322, and a side surface with a relatively large area is in close contact with the end face of the insulating bracket 2, and the other end of the second bent portion 322 is firmly in close contact with the FPC collection body 41 and fixedly connected to the FPC collection body 41. With the above-mentioned installation, the first bent portion 321 in the extraction wiring 3 can absorb the displacement that occurs in the FPC extraction body 41 when the battery cell expands, thereby ensuring the stability of the connection between the second bent portion 322 and the connector 5.

[0030] In this embodiment, the FPC collection body 41 is fixedly connected to the second bending portion 322 by hotbar welding, which provides high connection strength and efficiency, effectively saving time and labor costs. Of course, in other embodiments, the FPC collection body 41 may be fixed to the second bending portion 322 by laser welding, ultrasonic welding, resistance welding, etc., and this application is not limited thereto.

[0031] An adhesive coating layer is interposed between the FPC collection body 41 and the top of the expansion beam, and for example, a foam adhesive can be used to directly adhere the FPC collection body 41 to the top of the expansion beam, thereby eliminating the welding step between the two and improving production efficiency.

[0032] 4 and 5 , the battery case is assumed to have two battery modules. One of the battery modules has a collector 411 at one end of its FPC collection body 41 in the collection assembly 10, and the other has a collector socket 412 at one end of its FPC collection body in the collection assembly 10. The collector 411 can be inserted into the collector socket 412. When the BMS slave board 100 in one of the battery modules needs to collect operating information of the battery cells in the other battery module, the collector 411 can be directly inserted into the collector socket 412 to achieve communication between the two battery modules. When a PCB rigid board is used as the collection board and the collector 411 is attached to the PCB rigid board, the PCB rigid board has high hardness and poor toughness, so an FFC line must be used as a relay bridge to connect the two PCB rigid boards. This requires two additional welding steps for welding the FFC line to the PCB rigid board for each PCB rigid board.

[0033] Therefore, by replacing the PCB rigid board with the FPC collection plate 4, the difficulty of collecting, defining and connecting two adjacent battery modules can be further reduced, the number of welding operations can be significantly reduced, the process flow can be simplified and the process requirements can be reduced.

[0034] When more battery modules are installed in the battery case, the FPC collection body 41 may be provided with both a collector 411 and a collection socket 412 for insertion and fitting with the FPC collection body 41 of the adjacent collection assembly 10. Therefore, the present application does not limit whether the FPC collection body 41 is provided with both a collector 411 and a collection socket 412, and the three types of structures, namely, the FPC collection body 41 provided with only one collector 411, the FPC collection body 41 provided with only one collection socket 412, and the FPC collection body 41 provided with both a collector 411 and a collection socket 412, all fall within the scope of protection of the present application.

[0035] This embodiment also provides a battery module, which includes a battery cell and the above-mentioned collection assembly 10. The insulating bracket 2 has a through-hole that is coaxial with the terminal post of the battery cell, and the busbar 1 of the collection assembly 10 is electrically connected to the terminal post of the battery cell through the through-hole. The battery module includes the above-mentioned collection assembly 10, which has an FPC collection plate 4 fixedly connected to the expansion beam of the case body of the battery case. This ensures the installation stability of the FPC collection plate 4 and prevents the pin of the connector 5 on the FPC collection body 41 from breaking. When the expansion beam is deformed, the redundant part 43 of the FPC collection plate 4 can absorb the deformation, thereby maintaining the relative distance between the connector 5 and the BMS slave board 100 and stabilizing the connection between the connector 5 and the BMS slave board 100. This further ensures effective collection of the BMS slave board 100 and improves the operating performance and stability of the entire battery module.

[0036] This embodiment also provides a battery case, which includes a case body and the above-mentioned battery modules, with expansion beams spaced apart within the case body to define spaces for the battery modules, and the FPC collection plate 4 of the battery module is fixedly connected to the expansion beams. Replacing the rigid PCB with the FPC collection plate 4 and fixedly connecting the FPC collection plate 4 to the expansion beams effectively reduces the vibration of the FPC collection plate 4 and reduces the risk of the pins of the connector 5 on the FPC collection body 41 being subjected to concentrated stress and breaking. Furthermore, when the expansion beams are deformed, the redundant portions 43 of the FPC collection plate 4 absorb the strain caused by the expansion beams, ensuring the stability of the relative distance between the BMS slave board 100 and the connector 5, and ensuring the stability and reliability of the connection between the connector 5 and the BMS slave board 100. This extends the service life of the battery case, reduces the number of inspections and repairs, and saves on inspection and repair costs.

[0037] In the description herein, references to "some embodiments," "other embodiments," etc., mean that the features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the terms do not necessarily refer to the same embodiment or example. Furthermore, the described features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples. [Explanation of symbols]

[0038] 100···BMS slave board, 10···collection assembly, 1···bus bar, 2···insulating bracket, 3···collection wiring, 31···wiring body, 32···bent segment, 321···first bent portion, 322···second bent portion, 4···FPC collection plate, 41···FPC collection body, 411···collector, 412···collection socket, 42···connection portion, 43···redundancy portion, 5···connector.

Claims

1. A collection assembly (10) is applied to a battery module installed in a battery case having a plurality of expansion beams provided at intervals, wherein a space configured to accommodate the battery module is formed between two adjacent expansion beams, and a battery management system (BMS) slave board (100) is fixed to a side of the collection assembly, an insulating bracket (2); A collection wire (3) attached to the insulating bracket (2); A flexible printed circuit board (FPC) collection plate (4) and a connector (5) are provided. The FPC collection plate (4) includes an FPC collection body (41) fixedly connected to the top of the expansion beam and electrically connected to the end of the collection wiring (3), a connection part (42) connected to the connector (5), and a redundant part (43) whose both ends are connected to the FPC collection body (41) and the connection part (42), respectively, and the connector (5) is connected to the BMS slave board (100). Harvesting assembly.

2. The connection portion (42) is provided with a pierce-type terminal to be connected to the connector (5). The collection assembly of claim 1 .

3. The collecting wiring (3) comprises a wiring body (31) attached to the insulating bracket (2) and a bent segment (32) located at an end of the wiring body (31) and electrically connected to the FPC collecting plate (4). The collection assembly of claim 1 .

4. The connection method between the FPC collection plate (4) and the bent segment (32) includes hotbar welding, laser welding, ultrasonic welding and resistance welding; The collection assembly of claim 3 .

5. A foam adhesive layer is interposed between the FPC receiving body (41) and the top of the expansion beam. The collection assembly of claim 1 .

6. The collection wiring (3) is one of a flexible flat cable (FFC) line and a flexible die-cut wiring board (FDC) line. The collection assembly of claim 1 .

7. The sampling wiring (3) is an FFC line. The collection assembly of claim 6.

8. The FPC collection plate (4) has a collector (411) at one end and a collection socket (412) at the other end, and the collector (411) is inserted into the collection socket (412) of the adjacent FPC collection plate (4). The collection assembly of claim 1 .

9. a battery cell; and a collection assembly (10) according to any one of claims 1 to 8, electrically connected to the battery cell; Battery module.

10. A battery module according to claim 9, comprising: a case body having a plurality of expansion beams provided therein at intervals; and the battery module according to claim 9, wherein a space configured to accommodate the battery module is formed between two adjacent expansion beams, and a battery management system BMS slave board (100) is fixed to a side of the expansion beams; a collection assembly (10) in the battery module includes a flexible printed circuit board (FPC) collection plate (4) fixedly connected to the top of the expansion beams; and a connector (5) in the collection assembly (10) is connected to the BMS slave board (100). Battery case.

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