Energy storage battery and module heat insulation drainage plate

Abstract

The present application relates to the technical field of energy storage battery, in particular to an energy storage battery and a module heat insulation drainage plate and a temperature and pressure collecting line heat insulation structure, the energy storage battery comprises a battery module, the top of the battery module is provided with a module end plate, the module end plate is provided with an electric core explosion-proof valve, further comprising a heat insulation drainage plate, the heat insulation drainage plate covers above the module end plate, the heat insulation drainage plate is provided with a plurality of through holes and the upper surface is covered with a heat insulation sheet, the heat insulation sheet can withstand high temperature above 600 DEG C, further comprising a temperature and pressure collecting line heat insulation structure, the temperature and pressure collecting line is located in the inside of the battery module, the temperature and pressure collecting line heat insulation structure comprises a temperature and pressure collecting line and a heat insulation pipe wrapped outside, the heat insulation pipe can withstand high temperature above 600 DEG C.The present application can isolate the high temperature and high pressure mixed combustible gas liquid outside the module, prevent the high temperature and high pressure mixed combustible gas liquid from falling to the top of the electric core, prevent the secondary heating of the electric core; it can ensure that each conductive wire harness is separated from each other, completely isolate the situation of mutual lap and internal short circuit.

Description

Technical Field

[0001] This invention relates to the field of energy storage battery technology, and in particular to an energy storage battery and module heat insulation and diversion plate. Background Technology

[0002] Lithium-ion battery safety has always been a major problem hindering the industry's development. Most existing lithium-ion batteries do not consider thermal runaway under overcharge conditions. The top of the module is often only covered with a plastic cover or film to prevent dust and foreign objects. However, plastic has a low ignition point and cannot suppress the possibility of lithium-ion batteries igniting during overcharge tests. Furthermore, the commonly used and best material for the temperature and pressure sensing wires inside the module is Teflon wire. Teflon wire sheathing materials are generally of three types: PTFE (polytetrafluoroethylene), which can be used continuously at 260℃ with a maximum operating temperature of 290-300℃; FEP (fluorinated ethylene propylene copolymer), with a maximum operating temperature of 200℃; and PFA (perfluoroalkyl compounds), with a continuous operating temperature of 260℃. When Teflon wires reach their maximum temperature during module overcharge tests, the sheathing material melts, and the conductive wires overlap, easily causing internal short circuits. Once an internal short circuit causes an arc, it will instantly ignite a high-temperature flammable mixture of CO, H2, and CxHy gases, leading to a battery pack fire. Summary of the Invention

[0003] The purpose of this invention is to provide a heat insulation and diversion plate for energy storage batteries and modules, addressing the problem that it is difficult to suppress battery pack fires during overcharge testing in existing technologies.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A heat insulation and diversion plate for an energy storage battery module includes a base with a plurality of through holes. The number and shape of the through holes are adapted to the cell explosion-proof valve. The upper surface of the base is covered with a heat insulation sheet that can withstand temperatures above 600°C. A diversion port is provided on the side of the base.

[0006] The heat-insulating drainage plate of this invention can cover the module end plate of the battery module. During the overcharge test of the energy storage battery, if the internal pressure of the cell increases due to thermal runaway, and the cell's explosion-proof valve is opened, the high-temperature, high-pressure mixed flammable liquid generated by the thermal runaway chemical reaction of the cell can be quickly discharged to the outside of the module through the through holes of the heat-insulating drainage plate, preventing the high-temperature, high-pressure mixed flammable liquid from accumulating inside the module. After being ejected, the high-temperature, high-pressure mixed flammable liquid falls back to the high-temperature resistant heat insulation sheet by its own gravity or after hitting the top of the battery box. Since the working temperature of the heat insulation sheet is higher than that of the high-temperature, high-pressure mixed flammable liquid, it can isolate the high-temperature, high-pressure mixed flammable liquid outside the module, preventing it from falling onto the top of the cell and preventing secondary heating of the cell. The heat-insulating drainage plate of this invention can suppress battery pack fires during overcharge tests.

[0007] As a preferred embodiment of the present invention, the heat insulation sheet is one or more of the following: muscovite sheet, phlogopite sheet, thermoplastic polyimide sheet, and boron nitride ceramic plate, with different types of heat insulation sheets stacked one on top of the other. This achieves both manufacturability and economy while ensuring heat insulation performance.

[0008] As a preferred embodiment of the present invention, the thickness of the heat insulation sheet is greater than or equal to 0.3 mm.

[0009] As a preferred embodiment of the present invention, the thickness of the heat insulation sheet is 0.4mm-0.6mm, ensuring sufficient heat insulation performance.

[0010] As a preferred embodiment of the present invention, the upper surface of the heat insulation diversion plate is provided with a slope to facilitate the flow of high-temperature and high-pressure mixed combustible liquid to the outside of the module, and to prevent the high-temperature and high-pressure mixed combustible liquid from accumulating on the top of the module and falling to the top of the battery cell after melting the heat insulation diversion plate base.

[0011] As a preferred embodiment of the present invention, a flow guide is provided on the side of the base. The flow guide is located at the lowest point of the slope, which facilitates the flow of high-temperature and high-pressure mixed combustible liquid to the outside of the module, prevents the high-temperature and high-pressure mixed combustible liquid from accumulating on the top of the module, and avoids the high-temperature and high-pressure mixed combustible liquid from melting the heat insulation sheet and the heat insulation guide plate base after the heat insulation sheet stays for more than half an hour and then falling to the top of the battery cell.

[0012] As a preferred embodiment of the present invention, the base is a combination injection molded structural component made of PPS and GF mixed in a certain proportion.

[0013] The present invention also discloses a heat insulation structure for the temperature and pressure sampling line of an energy storage battery module, including the temperature and pressure sampling line, wherein the temperature and pressure sampling line is covered with a heat insulation tube, and the heat insulation tube can withstand high temperatures above 600°C.

[0014] The thermal insulation structure for the temperature and pressure sampling lines of the energy storage battery module of this invention provides enhanced thermal insulation for the lines. By encasing them in a thermal insulation tube that can withstand temperatures above 600°C, during overcharge testing of the energy storage battery, if the lithium battery experiences thermal runaway due to overcharge, it ensures that each conductive wire bundle remains separated, completely preventing them from bridging and causing internal short circuits and arcing. This thermal insulation structure for the temperature and pressure sampling lines of the energy storage battery module of this invention can suppress battery pack fires during overcharge testing.

[0015] As a preferred embodiment of the present invention, the heat insulation tube is one or more of silicone resin glass fiber tubes and high-silica fiber tubes, and the different types of heat insulation tubes are sequentially nested. This achieves both manufacturability and economy while ensuring heat insulation performance.

[0016] As a preferred embodiment of the present invention, the length of the heat insulation pipe is shorter than that of the temperature and pressure sampling line, and a certain length is reserved at the end for welding other components, such as aluminum busbars.

[0017] As a preferred embodiment of the present invention, the heat insulation pipe is wrapped with high-temperature resistant adhesive tape, which can withstand high temperatures above 200°C, further enhancing the heat insulation of the temperature and pressure sampling line.

[0018] The present invention also discloses an energy storage battery, including a battery module, a module end plate on the top of the battery module, a cell explosion-proof valve on the module end plate, and any of the aforementioned energy storage battery module heat insulation and diversion plates, the heat insulation and diversion plates covering the module end plate.

[0019] The present invention also discloses an energy storage battery, including a battery module, and further including a heat insulation structure for the temperature and pressure sampling lines of any of the energy storage battery modules, wherein the heat insulation structure for the temperature and pressure sampling lines is located inside the battery module.

[0020] The present invention also discloses an energy storage battery, including a battery module, a module end plate on the top of the battery module, a cell explosion-proof valve on the module end plate, and any of the aforementioned energy storage battery module heat insulation and diversion plates, the heat insulation and diversion plates covering the module end plate, and any of the aforementioned energy storage battery module temperature and pressure sampling line heat insulation structures, the temperature and pressure sampling line heat insulation structures being located inside the battery module.

[0021] The energy storage battery of this invention not only features a heat-insulating guide plate that can withstand temperatures above 600°C, effectively isolating the high-temperature, high-pressure mixed flammable liquid from the module and preventing it from falling onto the top of the cells and causing secondary heating, but also incorporates a heat-insulating tube that can withstand temperatures above 600°C, ensuring that each conductive wire bundle is separated and completely preventing short circuits and sparks caused by overlapping. Furthermore, the heat-insulating guide plate also isolates the temperature and pressure sensing lines inside the module, preventing the ejected high-temperature, high-pressure mixed flammable liquid from falling onto their surface. This synergistic effect significantly enhances the overall heat insulation of the battery module and effectively suppresses battery pack fires during overcharge testing.

[0022] In a preferred embodiment of the present invention, the base is detachably connected to the module end plate. This facilitates the installation of the heat insulation and diversion plate, allows for fine-tuning of existing energy storage batteries, achieves the aforementioned functions, and enables mass production.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The heat-insulating drainage plate of this invention can cover the module end plate of the battery module. During the overcharge test of the energy storage battery, if the internal pressure of the cell increases due to thermal runaway, and the cell's explosion-proof valve is opened, the high-temperature, high-pressure mixed flammable liquid generated by the thermal runaway chemical reaction of the cell can be quickly discharged to the outside of the module through the through holes of the heat-insulating drainage plate, preventing the high-temperature, high-pressure mixed flammable liquid from accumulating inside the module. After being ejected, the high-temperature, high-pressure mixed flammable liquid falls back to the heat-insulating sheet with high temperature resistance due to its own gravity or after hitting the top of the battery box. Since the working temperature of the heat-insulating sheet is higher than that of the high-temperature, high-pressure mixed flammable liquid, it can isolate the high-temperature, high-pressure mixed flammable liquid outside the module, preventing it from falling onto the top of the cell and preventing secondary heating of the cell. The heat-insulating drainage plate of this invention can suppress battery pack fires during overcharge tests.

[0024] 2. The upper surface of the heat insulation and diversion plate of the present invention is provided with a slope and the side is provided with a diversion port, which facilitates the flow of high temperature and high pressure mixed combustible liquid to the outside of the module, and prevents the high temperature and high pressure mixed combustible liquid from accumulating on the top of the module and falling to the top of the battery cell after melting the heat insulation and diversion plate base.

[0025] 3. The thermal insulation structure for the temperature and pressure sampling lines of the energy storage battery module of the present invention provides enhanced thermal insulation for the temperature and pressure sampling lines. By encasing them in a thermal insulation tube that can withstand temperatures above 600°C, during the overcharge test of the energy storage battery, if the lithium battery experiences thermal runaway due to overcharging, it can ensure that each conductive wire bundle is separated from each other, completely preventing them from bridging and causing internal short circuits and arcing. The thermal insulation structure for the temperature and pressure sampling lines of the energy storage battery module of the present invention can suppress battery pack fires during overcharge tests.

[0026] 4. The energy storage battery of this invention not only features a heat-insulating guide plate that can withstand temperatures above 600°C, effectively isolating the high-temperature, high-pressure mixed flammable liquid from the module and preventing it from falling onto the top of the cells and causing secondary heating, but also incorporates a heat-insulating tube that can withstand temperatures above 600°C, ensuring that each conductive wire bundle is separated and completely preventing short circuits and sparks caused by overlapping. Furthermore, the heat-insulating guide plate also isolates the temperature and pressure sensing lines inside the module, preventing the ejected high-temperature, high-pressure mixed flammable liquid from falling onto the surface of these lines. This synergistic effect significantly enhances the overall heat insulation function of the battery module and effectively suppresses battery pack fires during overcharge testing.

[0027] 5. The heat insulation diversion plate and the module end plate of the present invention are detachably connected, and the heat insulation pipe is directly wrapped outside the temperature and pressure sampling line, which makes it easy to fine-tune the existing energy storage battery to achieve the above functions and can be mass-produced. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the energy storage battery described in this invention.

[0029] Figure 2 This is an exploded view of the components of the energy storage battery described in this invention.

[0030] Figure 3 This is a schematic diagram of the structure of the heat insulation diversion plate described in this invention.

[0031] Figure 4 This is a top view of the heat insulation and drainage plate described in this invention.

[0032] Figure 5 This is a cross-sectional view (AA) of the heat insulation and drainage plate described in this invention.

[0033] Figure 6 This is a side view of the heat insulation and drainage plate described in this invention.

[0034] Figure 7 This is a schematic diagram of the thermal insulation structure of the temperature and pressure sampling line described in this invention. Figure 1 .

[0035] Figure 8 This is a schematic diagram of the thermal insulation structure of the temperature and pressure sampling line described in this invention. Figure 2 .

[0036] Icons: 1-Battery module, 2-Module end plate, 3-Cell explosion-proof valve, 4-Temperature and pressure sampling line, 5-Heat insulation and diversion plate, 51-Base, 52-Through hole, 53-Heat insulation sheet, 54-Drainage port, 6-Heat insulation pipe, 7-High temperature resistant tape. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings.

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0039] Example 1 like Figures 3-6 As shown, a heat insulation and diversion plate 5 for an energy storage battery module includes a base 51. The base 51 has several through holes 52. The number and shape of the through holes 52 are adapted to the cell explosion-proof valve 3 (the number and distribution of the through holes 52 are consistent with the cell explosion-proof valve 3, and the shape of the through holes 52 is basically consistent with the cell explosion-proof valve 3, and the size of the through holes 52 is basically consistent with the cell explosion-proof valve 3, or the size of the through holes 52 is slightly larger than the cell explosion-proof valve 3). The upper surface of the base 51 is covered with a heat insulation sheet 53, which can withstand temperatures above 600°C. The fact that the heat insulation sheet 53 can withstand temperatures above 600°C should be understood as meaning that the heat insulation sheet 53 can withstand at least 30 minutes at 600°C without melting, meeting the test requirements for overcharge testing of energy storage batteries.

[0040] The heat-insulating drainage plate of this invention can cover the module end plate of the battery module. During the overcharge test of the energy storage battery, if the internal pressure of the cell increases due to thermal diffusion, and the cell explosion-proof valve is opened, the high-temperature and high-pressure mixed flammable liquid generated by the thermal runaway chemical reaction of the cell can be quickly discharged outside the module through the through hole 52 of the heat-insulating drainage plate 5, preventing the high-temperature and high-pressure mixed flammable liquid from accumulating inside the module. After being sprayed out, the high-temperature and high-pressure mixed flammable liquid falls back to the heat-insulating sheet 53 with high temperature resistance due to its own gravity or after hitting the top of the battery box. Since the working temperature of the heat-insulating sheet 53 is higher than that of the high-temperature and high-pressure mixed flammable liquid, it can isolate the high-temperature and high-pressure mixed flammable liquid outside the module, preventing it from falling onto the top of the cell and preventing secondary heating of the cell. The heat-insulating drainage plate of this invention can suppress battery pack fire during overcharge testing.

[0041] In a preferred embodiment, the heat insulation sheet 53 is one of muscovite sheet, phlogopite sheet, thermoplastic polyimide sheet, and boron nitride ceramic plate, or several of these materials, with different types of heat insulation sheets 53 stacked one on top of the other. This ensures manufacturability and economy while maintaining heat insulation performance.

[0042] In one preferred embodiment, the thickness of the heat insulation sheet 53 is greater than or equal to 0.3 mm. More preferably, the thickness of the heat insulation sheet 53 is 0.4 mm to 0.6 mm, ensuring sufficient heat insulation performance.

[0043] In a preferred embodiment, the upper surface of the heat insulation guide plate 5 is provided with a slope. More preferably, a guide port 54 is provided on the side of the base 51, the guide port 54 is in communication with the external environment of the module, the guide port 54 is located at the lowest point of the slope, and several guide ports 54 can be provided. The guide port 54 facilitates the flow of high-temperature, high-pressure mixed combustible liquid to the outside of the module, preventing the high-temperature, high-pressure mixed combustible liquid from accumulating on the top of the module, and avoiding the high-temperature, high-pressure mixed combustible liquid from melting the heat insulation sheet 53 and the heat insulation guide plate base 51 after a residence time of more than half an hour, and then falling onto the top of the battery cell.

[0044] In a preferred embodiment, the base 51 is a PPS and GF combined injection molded structural part. Specifically, the base 51 is injection molded from PPS + 40% GF.

[0045] Example 2 like Figure 2 , 7 As shown, a heat insulation structure for a temperature and pressure sampling line of an energy storage battery module includes a temperature and pressure sampling line 4, and a heat insulation pipe 6 is fitted onto the temperature and pressure sampling line 4. The heat insulation pipe 6 can withstand high temperatures above 600℃. The fact that the heat insulation pipe 6 can withstand high temperatures above 600℃ should be understood as meaning that the heat insulation pipe 6 can withstand at a high temperature of 600℃ for at least 30 minutes without melting, meeting the test requirements for overcharge testing of energy storage batteries.

[0046] The thermal insulation structure for the temperature and pressure sampling lines of the energy storage battery module of this invention provides enhanced thermal insulation for the temperature and pressure sampling lines 4. By encasing them in a thermal insulation tube 6 that can withstand temperatures above 600°C, during overcharge testing of the energy storage battery, if the lithium battery experiences thermal runaway due to overcharge, it ensures that each conductive wire bundle remains separated, completely preventing internal short circuits and arcing caused by their overlap. This thermal insulation structure for the temperature and pressure sampling lines of the energy storage battery module of this invention can suppress battery pack fires during overcharge testing. The temperature and pressure sampling lines 4 and the thermal insulation tube 6 are connected in a sleeve, facilitating the modification of existing temperature and pressure sampling lines 4.

[0047] In a preferred embodiment, the heat insulation pipe 6 is one of silicone resin glass fiber pipe and high silica fiber pipe, or several of silicone resin glass fiber pipe and high silica fiber pipe, with different types of heat insulation pipes 6 sequentially nested. This achieves manufacturability and economy while ensuring heat insulation performance.

[0048] In a preferred embodiment, the length of the heat insulation pipe 6 is shorter than that of the temperature and pressure sampling line 4, and a certain length is reserved at the end for welding other components, such as aluminum busbars.

[0049] A preferred embodiment, such as Figure 8 As shown, the heat insulation pipe 6 is wrapped with high-temperature resistant adhesive tape 7, which can withstand temperatures above 200℃, thus further reinforcing the heat insulation of the temperature and pressure sampling line. The fact that the high-temperature resistant adhesive tape 7 can withstand temperatures above 200℃ should be understood as meaning that it can withstand at least 30 minutes at 200℃ without melting.

[0050] Example 3 like Figure 1 , 2 As shown, an energy storage battery includes a battery module 1, a module end plate 2 on the top of the battery module 1, a cell explosion-proof valve 3 on the module end plate 2, and a heat insulation and diversion plate 5 of the energy storage battery module as in embodiment 1, the heat insulation and diversion plate 5 covering the module end plate 2.

[0051] Example 4 like Figure 1 , 2 As shown, an energy storage battery includes a battery module 1 and a heat insulation structure for the temperature and pressure sampling lines of the energy storage battery module as described in Embodiment 2. The heat insulation structure for the temperature and pressure sampling lines is located inside the battery module 1.

[0052] Example 5 like Figure 1 , 2 As shown, an energy storage battery includes a battery module 1, a module end plate 2 on the top of the battery module 1, a cell explosion-proof valve 3 on the module end plate 2, and a heat insulation and diversion plate 5 as in embodiment 1, which covers the module end plate 2. It also includes a heat insulation structure for the temperature and pressure sampling lines 4 as in embodiment 2, with the temperature and pressure sampling lines 4 located inside the battery module 1.

[0053] The energy storage battery of this invention not only features a heat-insulating guide plate 5 that can withstand temperatures above 600°C, effectively isolating the high-temperature, high-pressure mixed flammable liquid from the module and preventing it from falling onto the top of the cells and causing secondary heating, but also incorporates a heat-insulating pipe 6 that can withstand temperatures above 600°C, ensuring that each conductive wire bundle is separated and completely preventing short circuits and sparks caused by overlapping. Furthermore, the heat-insulating guide plate 5 also isolates the temperature and pressure sensing lines 4 inside the module, preventing the ejected high-temperature, high-pressure mixed flammable liquid from falling onto their surface. This synergistic effect significantly enhances the overall heat insulation function of the battery module, effectively suppressing battery pack fires during overcharge testing. In a preferred embodiment, the base 51 is detachably connected to the module end plate 2, specifically via bolts. This allows for fine-tuning of existing energy storage batteries to achieve the aforementioned functions, enabling mass production.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat insulation and diversion plate for an energy storage battery module, characterized in that, The heat insulation and diversion plate (5) is used to cover the module end plate (2) and includes a base (51). The base (51) has several through holes (52). The number and shape of the through holes (52) are adapted to the cell explosion-proof valve (3). The upper surface of the base (51) is covered with a heat insulation sheet (53). The side wall of the through hole (52) passes through the heat insulation sheet (53). The heat insulation sheet (53) can withstand high temperatures above 600°C. The upper surface of the heat insulation and diversion plate (5) is provided with a slope. The side of the base (51) is provided with a diversion port (54). The diversion port (54) is located at the lowest point of the slope.

2. The heat insulation and diversion plate for the energy storage battery module according to claim 1, characterized in that, The heat insulation sheet (53) is one or more of the following: muscovite sheet, phlogopite sheet, thermoplastic polyimide sheet, and boron nitride ceramic plate. Different types of heat insulation sheets (53) are stacked one on top of the other.

3. The heat insulation and diversion plate for the energy storage battery module according to claim 2, characterized in that, The thickness of the heat insulation sheet (53) is greater than or equal to 0.3 mm.

4. The heat insulation and diversion plate for the energy storage battery module according to any one of claims 1-3, characterized in that, The base (51) is a PPS and GF combined injection molded structural component.

5. An energy storage battery, comprising a battery module (1), wherein a module end plate (2) is provided on the top of the battery module (1), and a cell explosion-proof valve (3) is provided on the module end plate (2), characterized in that, It also includes a heat insulation guide plate (5) for the energy storage battery module as described in any one of claims 1-4, the heat insulation guide plate (5) covering the module end plate (2).

6. The energy storage battery according to claim 5, characterized in that, It also includes a temperature and pressure sampling line (4) and a temperature and pressure sampling line insulation structure. The temperature and pressure sampling line insulation structure is located inside the battery module (1). The temperature and pressure sampling line (4) is wrapped with a heat insulation tube (6) so that each conductive wire bundle is separated from each other. The heat insulation tube (6) can withstand high temperatures above 600°C. The length of the heat insulation tube (6) is less than that of the temperature and pressure sampling line (4), and a certain length is reserved at the end for welding other components.

7. The energy storage battery according to claim 6, characterized in that, The heat insulation pipe (6) is one or more of silicone resin glass fiber pipe and high silica fiber pipe, and the heat insulation pipes (6) of different types are sequentially nested.

8. The energy storage battery according to any one of claims 6-7, characterized in that, The heat insulation pipe (6) is wrapped with high temperature resistant adhesive tape (7), which can withstand temperatures above 200°C.

9. The energy storage battery according to claim 5, characterized in that, The base (51) is detachably connected to the module end plate (2).

Images