Battery module of energy storage system PACK module

Abstract

The invention discloses an energy storage system PACK module battery module, which comprises at least one group of battery stacking bodies, each battery stacking body is formed by linearly arranging and stacking a plurality of square battery cells, and a thin film pressure sensor is arranged between the large surfaces of every two adjacent battery cells. According to the energy storage system PACK module battery module disclosed by the invention, one film pressure sensor is arranged between the large surfaces of every two adjacent battery cells of the battery stack body, so that the battery cell expansion pressure of the whole life cycle of the battery module can be effectively monitored, when the battery cells expand, the expansion force can be accurately detected, and the battery module can be used for accurately detecting the expansion force. And the pressure is transmitted to the pressure monitoring device in real time for real-time monitoring, so that the safety of the battery module is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a PACK module battery module for an energy storage system. Background Art

[0002] Energy storage systems, which manage power for the grid and the DC distribution network connected to it, are centered around batteries, which consist of multiple battery packs. During the use of an energy storage system, the battery cells expand and become compressed as they undergo multiple charge and discharge cycles.

[0003] Furthermore, when a battery cell is overcharged or short-circuited, the electrolyte or gas inside it expands rapidly, causing swelling. This ultimately increases the temperature inside the cell, creating the risk of fire or explosion. Therefore, real-time monitoring of the cell expansion pressure within the battery module of an energy storage system is essential.

[0004] However, in the prior art, the batteries inside the energy storage system are mainly monitored for temperature, current, and voltage to achieve operational control. There is almost no technology disclosed for battery expansion monitoring. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings and defects of the prior art and provide a PACK module battery module for an energy storage system.

[0006] A PACK module battery module of an energy storage system includes at least one battery stack, wherein the battery stack is formed by stacking a plurality of square battery cells in a straight line, and a thin film pressure sensor is arranged between the large surfaces of each two adjacent battery cells.

[0007] Wherein, a plurality of the thin film pressure sensors are commonly connected to an FFC harness, and the FFC harness transmits the pressure monitoring signal to the pressure monitoring mechanism.

[0008] The surface area of ​​the thin film pressure sensor in contact with the battery cell is adapted to the area of ​​the large surface of the battery cell.

[0009] Wherein, the thin film pressure sensor adopts a multi-point pressure sensor.

[0010] Wherein, a plurality of the thin film pressure sensors are connected to the FFC harness via a pin interface.

[0011] Among them, the large surfaces of every two adjacent battery cells are arranged with an elastic buffer structure, one surface of the thin film pressure sensor is fitted and connected to the elastic buffer structure, and the other surface of the thin film pressure sensor is in contact with the surface of a battery cell.

[0012] The elastic buffer structure includes an aerogel sheet and a foam sheet, one side surface of the aerogel sheet is connected to the foam sheet, and the other side surface of the aerogel sheet is in contact with the large surface of the battery cell.

[0013] Wherein, end plates are arranged at both ends of the battery stack, foam pads are arranged between the end plates and the battery cells, and the battery stack and the end plates are surrounded and tightened on the outside by cable ties.

[0014] An end plate pressure strip is arranged at the upper end of the end plate, and the end plate pressure strip is connected to the bottom plate of the box body through long bolts, thereby fixing the battery stack on the bottom plate of the box body.

[0015] A CCS assembly is arranged at the pole end of the battery stack, a cell temperature sensor and a cell voltage sensor are arranged on the CCS assembly, and each cell is connected to a cell temperature sensor, a cell temperature sensor and a cell voltage sensor.

[0016] The energy storage system PACK module battery module of the present invention arranges a thin film pressure sensor between the large surfaces of every two adjacent battery cells in the battery stack, thereby effectively monitoring the battery cell expansion pressure throughout the entire life cycle of the battery module. When the battery cell expands, the pressure change can be accurately detected and transmitted to the pressure monitoring device for real-time monitoring to ensure the safety of the battery module.

[0017] The present invention can autonomously monitor the expansion pressure of the energy storage battery in real time and in situ. It senses the expansion pressure of the battery cell of the energy storage battery through the measuring point of the thin film pressure sensor, thereby detecting the current expansion pressure value. It can assist the management system to intelligently detect the expansion pressure of the battery cell of the energy storage battery in situ, which helps to achieve battery safety management of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the battery module of the energy storage system PACK module of the present invention.

[0019] Figure 2 It is a schematic diagram of the CCS component of the energy storage system PACK module battery module of the present invention.

[0020] Figure 3 It is a schematic diagram of a battery stack of a PACK module battery module of the energy storage system of the present invention.

[0021] Figure 4 It is a schematic diagram of the self-expansion pressure collection system of the energy storage system PACK module battery module of the present invention.

[0022] Figure 5 It is a schematic diagram of the assembly of the energy storage system PACK module battery module and the box bottom plate of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] See also Figure 1 Figure 5 As shown, the present invention discloses an energy storage system PACK module battery module, comprising a battery module 2 consisting of at least one battery stack, wherein the battery stack is formed by a plurality of square battery cells 3 stacked in a straight line, and a thin film pressure sensor 5 is arranged between the large surfaces of each two adjacent battery cells. By arranging a thin film pressure sensor between the large surfaces of each two adjacent battery cells in the battery stack, it is possible to effectively monitor the battery cell expansion pressure throughout the life cycle of the battery module. When the battery cell expands, the pressure change can be accurately detected and transmitted to the pressure monitoring device for real-time monitoring to ensure the safety of the battery module.

[0025] In one embodiment, a plurality of the film pressure sensors 5 are connected to the FFC harness 4, and the FFC harness transmits the pressure monitoring signal to the pressure monitoring mechanism 9, such as Figure 4 As shown, each of the battery stacks is equipped with an FFC harness 4 and connected to a plurality of the thin film pressure sensors 5, so as to transmit the battery expansion pressure signals of the plurality of thin film pressure sensors 5 to a pressure monitoring mechanism 9, and then send them to a management system such as a battery management unit or a battery management system, so as to realize real-time monitoring of the battery expansion pressure around the clock.

[0026] In one embodiment, the surface area of ​​the thin film pressure sensor 5 in contact with the battery cell is adapted to the area of ​​the large surface of the battery cell. The thin film pressure sensor adopts a multi-point pressure sensor, including multiple monitoring points, which are arranged in a network shape to realize multi-point uniform monitoring of the expansion pressure on the large surface of the battery, so as to achieve comprehensive and more accurate battery expansion pressure monitoring.

[0027] In order to facilitate installation, disassembly or maintenance, the plurality of thin film pressure sensors 5 are connected to the FFC harness 4 via a pin interface 51 .

[0028] In one embodiment, an elastic buffer structure is arranged on the large surface of every two adjacent battery cells to reduce the pressure of battery cell expansion. One surface of the thin film pressure sensor 5 is fitly connected to the elastic buffer structure, and the other surface of the thin film pressure sensor is in contact with the surface of a battery cell.

[0029] In specific implementation, the elastic buffer structure can be realized by using an elastic plate or elastic sheet, such as an aerogel sheet and a foam sheet, wherein one side surface of the aerogel sheet is connected to the foam sheet, and the other side surface of the aerogel sheet is in contact with the large surface of the battery cell.

[0030] In one embodiment, end plates 8 are disposed at both ends of the battery stack. Foam pads are disposed between the end plates and the battery cells to prevent the end plates from damaging the batteries. In this application, each battery stack forms a fixed structure. Specifically, the battery stack and the end plates are surrounded and tightened on the outside by cable ties 7. There are at least two cable ties 7, spaced apart and arranged one above the other. Steel cable ties can be used. The end plates can be steel plates, such as profiles.

[0031] In one embodiment, an end plate pressure strip 10 is disposed on the upper end of the end plate 8. The end plate pressure strip 10 is connected to the bottom plate 1 of the battery box of the PACK module via long bolts 11, thereby securing the battery stack to the bottom plate. Preferably, the end plates at both ends of the multiple battery stacks each share one end plate pressure strip 10, i.e., there are two end plate pressure strips 10 in total, connecting the battery module to the bottom plate of the box, and two long bolts are disposed on each end plate.

[0032] In one embodiment, a CCS assembly 6 is arranged at the pole end of the battery stack, and a cell temperature sensor 63 and a cell voltage sensor 64 are arranged on the CCS assembly. Each cell is connected to a cell temperature sensor, a cell temperature sensor and a cell voltage sensor to monitor the temperature, voltage and current data of each cell and upload them to the battery management unit or battery management system for processing.

[0033] Specifically, the battery cell temperature sensor 63 and the battery cell voltage sensor 64 are connected to the welding row 61, which is arranged on the pole side of the battery cell. The signal acquisition harness 62 is connected to the signal collector to upload the collected battery cell temperature, voltage and current data to the battery management unit or battery management system for processing.

[0034] The energy storage system PACK module battery module of an embodiment of the present invention can effectively monitor the expansion pressure of the battery cells throughout the life cycle of the battery module by arranging a thin film pressure sensor between the large surfaces of every two adjacent battery cells in the battery stack. When the battery cells expand, the pressure signal can be accurately detected and transmitted to the pressure monitoring device for real-time monitoring to ensure the safety of the battery module.

[0035] The basic principles, main features and advantages of the present invention are shown and described above. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0036] The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and all changes that come within the meaning and range of equivalents of the claims are therefore intended to be embraced therein.

[0037] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. Energy storage system PACK module battery module, characterized in that: The invention comprises at least one battery stack, wherein the battery stack is formed by stacking a plurality of square battery cells in a straight line, and a thin film pressure sensor is arranged between the large surfaces of each two adjacent battery cells.

2. The energy storage system PACK module battery module according to claim 1, characterized in that: The plurality of thin film pressure sensors are commonly connected to an FFC harness, and the FFC harness transmits a pressure monitoring signal to a pressure monitoring mechanism.

3. The energy storage system PACK module battery module according to claim 1, characterized in that: The surface area of ​​the thin film pressure sensor that contacts the battery cell is adapted to the area of ​​the large surface of the battery cell.

4. The energy storage system PACK module battery module according to claim 1, characterized in that: The thin film pressure sensor adopts a multi-point pressure sensor.

5. The energy storage system PACK module battery module according to claim 2, characterized in that: The plurality of thin film pressure sensors are connected to the FFC harness via a pin interface.

6. The energy storage system PACK module battery module according to claim 1, characterized in that: An elastic buffer structure is arranged on the large surface of every two adjacent battery cells. One surface of the thin film pressure sensor is fitted and connected to the elastic buffer structure, and the other surface of the thin film pressure sensor is in contact with the surface of a battery cell.

7. The energy storage system PACK module battery module according to claim 4, characterized in that: The elastic buffer structure includes an aerogel sheet and a foam sheet. One side surface of the aerogel sheet is connected to the foam sheet, and the other side surface of the aerogel sheet is in contact with the large surface of the battery core.

8. The energy storage system PACK module battery module according to claim 1, characterized in that: End plates are arranged at both ends of the battery stack, foam pads are arranged between the end plates and the battery cells, and the battery stack and the end plates are surrounded and tightened on the outside by cable ties.

9. The energy storage system PACK module battery module according to claim 7, characterized in that: An end plate pressure strip is arranged at the upper end of the end plate, and the end plate pressure strip is connected to the bottom plate of the box body through long bolts, so as to fix the battery stack on the bottom plate of the box body.

10. The energy storage system PACK module battery module according to claim 1, characterized in that: A CCS assembly is arranged at the pole end of the battery stack, and a cell temperature sensor and a cell voltage sensor are arranged on the CCS assembly. Each cell is connected to a cell temperature sensor, a cell temperature sensor and a cell voltage sensor.

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