Energy storage battery with expansion force monitoring structure

Abstract

The utility model discloses a kind of energy storage batteries with expansion force monitoring structure, including electric core group, expansion force monitoring assembly and integrated busbar, the electric core group is made of at least two electric cores, the expansion force monitoring assembly is arranged in the electric core group, at least one set of expansion force monitoring assembly is provided in the electric core group, the integrated busbar is installed to the top of the electric core group, the integrated busbar is electrically connected together with the expansion force monitoring assembly, the expansion force monitoring assembly is made of insulating sheet and the acquisition wire harness of installation in the side of the insulating sheet, pressure sensor is integrally installed on the acquisition wire harness.The utility model has the beneficial effect that: high integration, save space, volume and cost, facilitate modularization, convenient production and use;Adopt patch type pressure sensor and cooperate with other components, simple structure, reliable connection.

Description

Technical Field

[0001] This utility model relates to the field of battery safety, and in particular to an energy storage battery with an expansion force monitoring structure. Background Technology

[0002] Lithium-ion battery thermal runaway refers to the phenomenon where the temperature of a battery rises uncontrollably due to a chain reaction of exothermic reactions in a single battery cell. When the heat generated by a thermally runaway battery exceeds its capacity to dissipate, the heat accumulates further, potentially leading to fires, explosions, and gas releases. If thermal runaway in one battery cell triggers thermal runaway in other cells within a battery system, this is called thermal runaway propagation. With the rapid expansion of lithium batteries in residential, commercial, industrial, power plant, base station, and digital energy storage applications, numerous fires involving lithium battery energy storage products caused by thermal runaway propagation have occurred in recent years, resulting in severe losses. Early detection of thermal runaway and the implementation of appropriate protective measures can significantly reduce these losses. Utility Model Content

[0003] The purpose of this invention is to provide an energy storage battery with an expansion force monitoring structure in order to solve the above-mentioned problems.

[0004] This utility model achieves the above objectives through the following technical solutions: An energy storage battery with an expansion force monitoring structure includes a cell pack, an expansion force monitoring component, and an integrated busbar. The cell pack consists of at least two cells, and the expansion force monitoring component is disposed within the cell pack. At least one set of expansion force monitoring components is provided within the cell pack. The integrated busbar is installed on the top of the cell pack and is electrically connected to the expansion force monitoring component.

[0005] Furthermore, the expansion force monitoring component consists of an insulating sheet and a data acquisition harness mounted on the side of the insulating sheet, and a pressure sensor is integrated on the data acquisition harness.

[0006] Furthermore, the acquisition harness includes an acquisition line FPC, a monitoring connector, and wires connecting the acquisition line FPC and the monitoring connector.

[0007] Furthermore, the pressure sensor is a patch-type pressure sensor, with the acquisition line FPC and the wire soldered together.

[0008] Furthermore, the integrated busbar includes a hot press mold and a busbar FPC pasted on the lower side of the hot press mold, and a plurality of pressure sensor male terminals are integrated and installed on the busbar FPC.

[0009] Furthermore, the battery cell assembly has battery cell end plates on both sides, and the battery cell assembly and battery cell end plates are surrounded by steel strips.

[0010] Furthermore, the bottom of the battery cell assembly is provided with a base plate.

[0011] Furthermore, the thickness range of the acquisition line FPC is [0.1mm, 0.3mm], the thickness range of the patch pressure sensor is (0, 0.2mm], and the thickness range of the insulating sheet is [0.4mm, 0.6mm].

[0012] Furthermore, the thickness of the acquisition line FPC is 0.2 mm, the thickness of the patch pressure sensor is 0.1 mm, and the thickness of the insulating sheet is in the range of 0.5 mm.

[0013] Furthermore, the expansion force detection component is sandwiched between two adjacent battery cells.

[0014] The beneficial effects of this utility model include, but are not limited to: 1) The structure is simple, highly integrated, saves space, volume and cost, is easy to modularize, and is convenient for production and use.

[0015] 2) A surface-mount pressure sensor is used, which can be set between the cells to form a module. It is integrated with the insulating sheet, which facilitates the automated stacking production of the module.

[0016] 3) The patch-type pressure sensor transmits cell expansion force data through the acquisition line FPC, monitoring connector, and pressure sensor male terminal, etc. It has a simple structure, is easy to assemble, and has a reliable connection. Attached Figure Description

[0017] Figure 1 This is a structural diagram of an energy storage battery with an expansion force monitoring structure as described in this utility model; Figure 2 This is a side view of the expansion force monitoring component of an energy storage battery with an expansion force monitoring structure according to the present invention; Figure 3 This is a top view of the expansion force monitor of an energy storage battery with an expansion force monitoring structure as described in this utility model; Figure 4 This is a diagram of the integrated busbar structure of an energy storage battery with an expansion force monitoring structure as described in this utility model; Figure 5 This invention relates to a busbar FPC structure for an energy storage battery with an expansion force monitoring structure. Figure 1 ; Figure 6 This invention relates to a busbar FPC structure for an energy storage battery with an expansion force monitoring structure. Figure 2 .

[0018] The annotations in the attached figures are explained as follows: 1. Battery cell assembly; 11. Battery cell; 111. Electrode; 2. Expansion force monitoring assembly; 21. Pressure sensor; 22. Insulating sheet; 23. Data acquisition harness; 24. Data acquisition line FPC; 25. Monitoring connector; 26. Wire; 3. Battery cell end plate; 4. Base plate; 5. Integrated busbar; 51. Busbar FPC; 52. Hot press mold; 521. Through hole; 53. Pressure sensor male terminal; 54. Aluminum busbar; 55. Busbar connector male terminal; 6. Steel strip. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings: like Figure 1 - Figure 6 As shown, an energy storage battery with an expansion force monitoring structure includes a cell pack 1, an expansion force monitoring component 2, and an integrated busbar 5.

[0020] The cell assembly 1 consists of at least two cells 11. An expansion force monitoring component 2 is installed inside the cell assembly 1. At least one set of expansion force monitoring components 2 is installed inside the cell assembly 1 to monitor the expansion force of the cells.

[0021] In one embodiment, when the battery cell group 1 contains N battery cells 11 (N is a positive integer greater than or equal to 2), the N battery cells 11 are arranged in sequence, and a set of expansion force monitoring components 2 can be provided between any two adjacent battery cells 11. The number of sets of expansion force monitoring components 2 can be M, that is, there can be a total of M sets of expansion force monitoring components 2, where M is a positive integer and the range of M is [1, N-1].

[0022] Example of an embodiment with M=1: When N=2, that is, the battery cell group 1 contains two battery cells 11, the two battery cells 11 are arranged in sequence, and a set of expansion force monitoring components 2 is provided between the two battery cells 11; when N>2, that is, the battery cell group 1 contains N battery cells 11, the N battery cells 11 are arranged in sequence, and a set of expansion force monitoring components 2 is provided between a group of adjacent battery cells 11, wherein a group of adjacent battery cells refers to two adjacent battery cells.

[0023] Example of an implementation with M=2: When N=3, the cell group 1 contains three cells 11, which are arranged in sequence, and each adjacent cell 11 is provided with a set of expansion force monitoring components 2; when N>3, the cell group 1 contains N cells 11, which are arranged in sequence, and each of the two adjacent cell groups 11 is provided with a set of expansion force monitoring components 2; for the case of M=2, a total of two sets of expansion force detection components 2 are used, which can achieve redundancy in expansion force monitoring without excessive cost, thus balancing cost and redundancy design.

[0024] ... Example of an embodiment where M=N-1: The battery cell group 1 contains N battery cells 11, which are arranged in sequence. Each group of adjacent battery cells 11 is provided with a set of expansion force monitoring components 2, so there are a total of M sets, i.e. (N-1) sets of expansion force monitoring components 2. In the case of M=N-1, expansion force monitoring can be implemented for each battery cell 11.

[0025] In one embodiment, the expansion force monitoring component 2 is sandwiched between two adjacent cells 11.

[0026] The integrated busbar 5 is installed on top of the cell assembly 1, and the integrated busbar 5 is electrically connected to the expansion force monitoring component 2.

[0027] In the above structure, the expansion force monitoring component 2 is mainly used to monitor the lateral expansion pressure of the cell and upload the data to the BMS of the battery PACK for processing in real time. When the data is abnormal, the BMS will perform thermal runaway warning, etc., to keep the loss to a minimum.

[0028] In one embodiment, the expansion force monitoring component 2 consists of an insulating sheet 22 and a data acquisition harness 23 mounted on the side of the insulating sheet 22, and a pressure sensor 21 is integrated on the data acquisition harness 23.

[0029] The acquisition harness 23 includes an acquisition line FPC 24, a monitoring connector 25, and a wire 26, wherein the wire 26 connects the acquisition line FPC 24 and the monitoring connector 25.

[0030] The pressure sensor 21 mentioned above is a surface-mount pressure sensor, which is integrated on the acquisition line FPC 24 to avoid excessive local pressure when in contact with the battery cell 11. The thickness of the acquisition line FPC 24 is H1, and the thickness of the surface-mount pressure sensor is H2. The overlapping area of ​​the acquisition line FPC 24 and the insulating sheet 22 is glued with double-sided tape. The insulating sheet 22 can be made of materials such as PC, PP or epoxy board, and has a thickness of M.

[0031] In one embodiment, H1 ranges from [0.1mm, 0.3mm], H2 ranges from (0, 0.2mm], and M ranges from [0.4mm, 0.6mm].

[0032] In one embodiment, H1 is 0.2 mm, H2 is 0.1 mm, and M is 0.5 mm.

[0033] In one embodiment, H1 is 0.15 mm, H2 is 0.15 mm, and M is 0.4 mm.

[0034] In one embodiment, H1 is 0.2 mm, H2 is 0.15 mm, and M is 0.4 mm.

[0035] In one embodiment, H1 is 0.1 mm, H2 is 0.1 mm, and M is 0.4 mm.

[0036] In one embodiment, H1 is 0.2 mm, H2 is 0.2 mm, and M is 0.5 mm.

[0037] In one embodiment, the acquisition line FPC 24 and the wire 26 are soldered together (or the acquisition line FPC 24 and the wire 26 are connected by soldering), and the soldering position can be protected with PI film or UV glue; the monitoring connector 25 is a 2-pin female terminal, one side is connected to the wire 26, and the other side is plugged into the pressure sensor male terminal 53; the pressure sensor male terminal 53 is set on the integrated busbar 5, and the pressure sensor 21 is set in the center of the insulating sheet 22, which is the area where the expansion force of the monitoring cell 11 is the largest and the change is most sensitive.

[0038] In one embodiment, the integrated busbar 5 includes a hot press mold 52 and a busbar FPC 51 pasted on the underside of the hot press mold 52. Several pressure sensor male terminals 53 are integrated and installed on the busbar FPC 51. The pressure sensor male terminals 53 are 2-pin (2-pin) surface mount connectors. Their pins are soldered to one end of the busbar FPC 51 and can be protected by applying a PI film or UV glue. They are male terminals and are plugged into the monitoring connector 25.

[0039] One end of the integrated busbar 5 is provided with a male terminal 55 of the busbar connector, whose pins are soldered to the other end of the busbar FPC 51. It can be connected to the BMS board (not shown in the figure) by plugging in a corresponding female terminal.

[0040] In one embodiment, the integrated busbar 5 further includes an aluminum busbar 54, which is placed below the hot pressing mold 52 and corresponds to the position of the electrode 111 at the top of the battery cell 11. The aluminum busbar 54 is used to connect with the electrode 111 (e.g., by laser welding) to realize the series or parallel connection of multiple battery cells 11. The hot pressing mold 52 is provided with a through hole 521 corresponding to the position of the aluminum busbar 54, which reserves space for welding the aluminum busbar 54 and the electrode 111.

[0041] In this utility model, the pressure sensor 21 monitors the cell expansion force and transmits the expansion force data sequentially through the acquisition line FPC 24, the wire 26, the monitoring connector 25, the pressure sensor male terminal 53, the busbar FPC 51, the busbar connector male terminal 55, and the corresponding female terminal of the busbar connector male terminal 55 to the BMS board for subsequent data processing.

[0042] In one embodiment, the thickness of the hot press mold is 0.2 to 0.5 mm.

[0043] In one embodiment, battery cell assembly 1 is provided with battery cell end plates 3 on both sides, which are mostly steel plates or aluminum alloy end plates, but can also be other end plates, such as plastic. The battery cell assembly 1 and the battery cell end plates 3 are surrounded by steel strips 6 for fastening the battery cell assembly 1.

[0044] In one embodiment, the bottom of the battery cell assembly 1 is provided with a base plate 4, and the battery cell assembly 1 is placed on the base plate 4.

[0045] The technical solution of this utility model has a simple structure, high integration, saves space, volume and cost, is easy to modularize, and is convenient for production and use. It adopts a surface-mount pressure sensor to monitor the cell expansion force. Due to its thinness, it can be set between cells to form a module. The surface-mount pressure sensor is integrated with the insulating sheet, which facilitates the automated stacking production of modules. The surface-mount pressure sensor 21 is connected to the monitoring connector 25 through the acquisition line FPC 24. The monitoring connector 25 is plugged into the male terminal 53 of the pressure sensor to transmit the cell expansion force data. The structure is simple, the assembly is simple, and the connection is reliable.

[0046] In addition, the energy storage battery with expansion force monitoring structure is the same as the energy storage battery with expansion force monitoring structure described in any of the above embodiments. Since the energy storage battery with expansion force monitoring structure has the above-mentioned technical effects, the electronic device with the energy storage battery with expansion force monitoring structure should also have the corresponding technical effects, which will not be elaborated here.

[0047] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. An energy storage battery with an expansion force monitoring structure, characterized in that: The device includes a battery cell assembly, an expansion force monitoring component, and an integrated busbar. The battery cell assembly consists of at least two battery cells. The expansion force monitoring component is disposed within the battery cell assembly. At least one set of expansion force monitoring components is provided within the battery cell assembly. The integrated busbar is installed on the top of the battery cell assembly and is electrically connected to the expansion force monitoring component.

2. The energy storage battery with an expansion force monitoring structure according to claim 1, characterized in that: The expansion force monitoring component consists of an insulating sheet and a data acquisition harness mounted on the side of the insulating sheet, and a pressure sensor is integrated on the data acquisition harness.

3. The energy storage battery with an expansion force monitoring structure according to claim 2, characterized in that: The acquisition harness includes an acquisition line FPC, a monitoring connector, and wires connecting the acquisition line FPC and the monitoring connector.

4. The energy storage battery with an expansion force monitoring structure according to claim 3, characterized in that: The pressure sensor is a surface-mount pressure sensor, with the data acquisition line FPC and the wire soldered together.

5. The energy storage battery with an expansion force monitoring structure according to claim 1, characterized in that: The integrated busbar includes a hot press mold and a busbar FPC pasted on the lower side of the hot press mold. Several pressure sensor male terminals are integrated and installed on the busbar FPC.

6. The energy storage battery with an expansion force monitoring structure according to claim 1, characterized in that: Both sides of the battery cell assembly are provided with battery cell end plates, and the battery cell assembly and battery cell end plates are surrounded by steel strips.

7. The energy storage battery with an expansion force monitoring structure according to claim 1, characterized in that: The bottom of the battery cell assembly is provided with a base plate.

8. The energy storage battery with an expansion force monitoring structure according to claim 4, characterized in that: The thickness range of the acquisition line FPC is [0.1mm, 0.3mm], the thickness range of the patch pressure sensor is (0, 0.2mm], and the thickness range of the insulating sheet is [0.4mm, 0.6mm].

9. The energy storage battery with an expansion force monitoring structure according to claim 8, characterized in that: The thickness of the acquisition line FPC is 0.2 mm, the thickness of the patch pressure sensor is 0.1 mm, and the thickness of the insulating sheet is 0.5 mm.

10. The energy storage battery with an expansion force monitoring structure according to claim 1, characterized in that: The expansion force detection component is sandwiched between two adjacent battery cells.

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