Energy storage battery pack capable of reducing thermal runaway risk of battery cell

Abstract

The utility model relates to a battery pack, and discloses an energy storage battery pack capable of reducing the risk of thermal runaway of battery cells, which comprises a battery pack box body (1) and a battery PACK (2) arranged in the battery pack box body (1), the battery PACK (2) comprises a plurality of battery modules (3) arranged in sequence, each battery module (3) comprises a plurality of battery cells (4) arranged in sequence, and the battery cells (4) are arranged in the battery pack box body (1). And heat insulation sheets (5) are arranged between the adjacent battery modules (3), between the adjacent battery cells (4) and between the battery PACK (2) and the inner surface of the battery pack box body (1). According to the utility model, the heat spreading of the peripheral battery cells (4) caused by a single failure battery cell (4) can be effectively isolated, the risk of thermal failure of the battery cells (4) of the energy storage battery pack is reduced, and the safety of the whole system is improved.

Description

Technical Field

[0001] The utility model relates to a battery pack, and in particular to an energy storage battery pack capable of reducing the risk of thermal runaway of battery cells. Background Art

[0002] With the rapid development of renewable energy and the growing demand for electricity, energy storage systems, as an integral part of the power system, are attracting increasing attention for their safety. The safe operation of energy storage systems is not only crucial to the stability of the power system but also directly impacts the safety of people and property. Therefore, ensuring the safe operation of energy storage systems has become a pressing issue. Reducing the risk of thermal runaway and fire in battery packs during use and improving the safety of the entire energy storage system are key to addressing this issue.

[0003] To address the risk of fire caused by thermal runaway during use of the battery pack, existing technologies involve sticking PC insulating sheets between battery cells or bonding them with structural adhesives. However, these methods are unable to isolate the heat spread from a single failed cell to surrounding cells, which may eventually cause the entire system to burn, resulting in serious safety issues. Utility Model Content

[0004] The utility model aims at the risk of thermal runaway of battery cells in battery packs in the prior art and provides an energy storage battery pack that reduces the risk of thermal runaway of battery cells.

[0005] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0006] An energy storage battery pack that reduces the risk of thermal runaway of battery cells includes a battery pack case and a battery PACK disposed within the battery pack case. The battery PACK includes a plurality of battery modules arranged in sequence, and the battery module includes a plurality of battery cells arranged in sequence. Thermal insulation sheets are provided between adjacent battery modules, between adjacent battery cells, and between the battery PACK and the inner surface of the battery pack case.

[0007] Preferably, a foam double-sided adhesive tape is attached to the back of the heat insulation sheet, which can facilitate the installation of the heat insulation sheet at a desired location.

[0008] Preferably, at least one steel strap is provided on the outer side wall of the battery module, which is wrapped around the battery module. The provision of the steel strap can ensure the installation stability of the thermal insulation sheet.

[0009] Preferably, the battery pack further includes an aerosol fire extinguishing device disposed within the battery pack housing. The aerosol fire extinguishing device comprises an aerosol fire extinguisher, a controller for controlling the aerosol discharge from the aerosol fire extinguisher, and a detection unit connected to the controller. The detection unit comprises a temperature sensing wire disposed around the outer side of the battery pack for detecting the battery pack temperature and transmitting the detected temperature signal to the controller. The controller controls whether the aerosol fire extinguisher is activated based on a comparison of the received temperature signal with a preset temperature. The provision of the aerosol fire extinguishing device enables timely injection of cooling and fire-extinguishing substances into the housing, avoiding pressure loss and time delays in the fire-extinguishing spray device caused by long-distance pipeline transmission.

[0010] Preferably, the battery pack housing includes a bottom liquid cooling plate and a shell mounted on the bottom liquid cooling plate, with a fire-retardant coating sprayed on the inner surface of the shell. The fire-retardant coating can further prevent the flame impact of thermal runaway of the battery cell from spreading heat to other battery packs.

[0011] Preferably, a firefighting bracket for securing the aerosol fire extinguishing device is mounted on the bottom liquid cooling plate. The bracket comprises a fixing bracket and a mounting bracket located in the middle of the fixing bracket, with the lower end of the fixing bracket fixed to the upper surface of the bottom liquid cooling plate. The aerosol fire extinguisher is mounted within the mounting bracket, and the end of the temperature sensing cable is connected to the aerosol fire extinguisher via a wiring harness. This fully utilizes the bottom liquid cooling plate for the installation of the aerosol fire extinguishing device, resulting in a rational installation layout, compact structure, and minimal space requirements.

[0012] Preferably, the mounting bracket is a rectangular frame with first connecting ears on either side. The fixing bracket is plate-shaped with a rectangular through-hole in the middle for the mounting bracket to extend into. The fixing bracket also has bolt holes that connect to the first connecting ears and second connecting ears that connect to the bottom liquid cooling plate. The mounting bracket's structural design allows for more rational installation of the various components of the aerosol fire extinguishing system within the battery pack enclosure, resulting in a compact overall installation structure that occupies less space within the battery pack enclosure.

[0013] Preferably, the front end of the battery pack housing is provided with a PACK front panel, which is provided with an inspection port corresponding to the aerosol fire extinguishing device, and an inspection cover is installed at the inspection port. The provision of the inspection cover facilitates the inspection of the fire extinguishing device in the battery pack housing.

[0014] The utility model has significant technical effects due to the adoption of the above technical solutions:

[0015] The utility model can effectively isolate the heat spread of surrounding cells caused by a single failed cell, reduce the risk of thermal failure of the cells in the energy storage battery pack, and improve the safety of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural diagram of embodiment 1 of the present utility model.

[0017] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle shell 10.

[0018] Figure 3 yes Figure 1 Schematic diagram of the structure after the shell 10 is removed.

[0019] Figure 4 yes Figure 3 Schematic diagram of the structure after removing battery PACK2.

[0020] Figure 5 yes Figure 3 Schematic diagram of the structure of the battery module 3.

[0021] Figure 6 yes Figure 3 Schematic diagram of the structure of the middle thermal insulation sheet 5.

[0022] Figure 7 yes Figure 5 Schematic diagram of the structure of the fire fighting support 13.

[0023] Figure 8 yes Figure 7 Schematic diagram of the structure of the middle mounting frame 132. DETAILED DESCRIPTION

[0024] The present invention is described in further detail below with reference to the accompanying drawings and embodiments.

[0025] Example 1

[0026] An energy storage battery pack that reduces the risk of thermal runaway of battery cells, such as Figures 1-8 As shown, it includes a battery pack case 1 and a battery PACK2 arranged in the battery pack case 1, the battery PACK2 includes a plurality of battery modules 3 arranged in sequence, the battery module 3 includes a plurality of battery cells 4 arranged in sequence, and thermal insulation sheets 5 are provided between adjacent battery modules 3, between adjacent battery cells 4, and between the battery PACK2 and the inner surface of the battery pack case 1.

[0027] The back of the thermal insulation sheet 5 in this embodiment is adhered with a foam double-sided tape 6, and specifically adopts a pre-oxidized silk aerogel thermal insulation sheet 5, which has an insulation coefficient of ≤0.02 W / mK and a UL94-V0 level of flame retardancy, which can effectively prevent the thermal failure of a single battery cell 4 from spreading to other battery cells 4 and causing a larger fire.

[0028] In this embodiment, two steel strapping strips 7 wrapped around the battery module 3 are provided on the outer wall of the battery module 3. The two steel strapping strips 7 are arranged one above the other and are both made of stainless steel, which can effectively ensure the installation stability of each thermal insulation sheet 5 on the battery module 3.

[0029] This embodiment also includes an aerosol fire extinguishing device 8 arranged inside the battery pack box 1. The aerosol fire extinguishing device 8 includes an aerosol fire extinguisher and a controller for controlling the aerosol fire extinguisher to spray aerosol, and a detection unit connected to the controller. The detection unit includes a temperature sensing line 801 arranged around the outer side of the battery PACK2 for detecting the temperature of the battery PACK2 and sending the detected temperature signal to the controller. The controller controls whether the aerosol fire extinguisher is turned on based on the comparison of the received temperature signal with the preset temperature.

[0030] Specifically, the aerosol fire extinguisher is an existing product on the market. It can open the sealing valve on it through the signal detected by the sensor to fill the battery pack box 1 with cooling and fire extinguishing substances, avoiding the pressure loss and time delay of the fire extinguishing spray device caused by long-distance pipeline transmission.

[0031] In this embodiment, the temperature of the battery pack is specifically detected by the temperature sensing line 801. The temperature sensing line 801 surrounds the outer periphery of the battery PACK2 and can effectively detect the temperature changes around the battery PACK2. When the detected temperature exceeds the preset temperature in the controller, the controller will send a signal to control the sealing valve to open. In actual products, the controller can be connected to the battery management system for better control and tracking.

[0032] In order to further prevent the flame impact of thermal runaway of the battery cell 4 from causing heat diffusion to other battery packs, the battery pack box 1 includes a bottom liquid cooling plate 9 and a shell 10 installed on the bottom liquid cooling plate 9. A fire retardant coating 11 is sprayed on the inner surface of the shell 10. The fire retardant coating 11 is a fire retardant paint sprayed with a thickness of 1.5-2 mm, and the fire retardant paint available on the market can be used.

[0033] In order to facilitate the installation of the aerosol fire extinguishing device 8, a fire-fighting bracket 13 for fixing the aerosol fire-extinguishing device 8 is installed on the bottom liquid cooling plate 9. The fire-fighting bracket 13 includes a fixing frame 131 and a mounting frame 132 located in the middle of the fixing frame 131. The lower end of the fixing frame 131 is fixed on the upper end surface of the bottom liquid cooling plate 9; the aerosol fire extinguisher is arranged in the mounting frame 132 and the end of the temperature sensing line 801 is connected to the sealing valve of the aerosol fire extinguisher through a wiring harness.

[0034] The mounting bracket 132 is in the shape of a rectangular frame and has first connecting ears 133 on both sides. The fixing bracket 131 is in the shape of a plate and has a rectangular through hole 134 in the middle for the mounting bracket 132 to extend into. The fixing bracket 131 is also provided with a bolt hole 135 connected to the first connecting ear 133 by bolts and a second connecting ear 136 connected to the bottom liquid cooling plate 9 by bolts.

[0035] The bottom liquid cooling plate 9 is fully utilized for the installation of the aerosol fire extinguishing device 8, making the overall installation structure compact and occupying less internal space of the battery pack box 1. The structural design of the mounting frame 132 can realize a more reasonable installation of the various components of the aerosol fire extinguishing device 8 in the battery pack box 1.

[0036] In addition, in order to facilitate the inspection and maintenance of the fire extinguishing device in the battery pack case 1, a PACK front end plate 12 is provided on the front end face of the battery pack case 1. The front end face of the battery pack case 1 is constructed with an installation port, and the PACK front end plate 12 is arranged at the installation port. An inspection port 15 corresponding to the aerosol fire extinguishing device 8 is provided on the PACK front end plate 12, and an inspection cover 14 is installed at the inspection port 15. In this way, when a fault occurs, there is no need to remove the entire battery pack shell 10, but only need to open the inspection cover 14, where the inspection cover 14 is fixed to the front end face of the battery pack case 1 by bolts.

[0037] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on one or several embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the scope of protection of the present application.

[0038] In short, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention patent.

Claims

1. An energy storage battery pack for reducing the risk of thermal runaway of a battery cell, comprising a battery pack box (1) and a battery PACK (2) arranged in the battery pack box (1), characterized in that: The battery PACK (2) includes a plurality of battery modules (3) arranged in sequence, each battery module (3) includes a plurality of battery cells (4) arranged in sequence, and thermal insulation sheets (5) are provided between adjacent battery modules (3), between adjacent battery cells (4), and between the battery PACK (2) and the inner surface of the battery pack case (1).

2. The energy storage battery pack for reducing the risk of thermal runaway of battery cells according to claim 1, characterized in that: The back of the heat insulation sheet (5) is adhered with a foam double-sided adhesive tape (6).

3. The energy storage battery pack for reducing the risk of thermal runaway of battery cells according to claim 1, characterized in that: At least one strapping steel belt (7) wrapped around the battery module (3) is provided on the outer side wall of the battery module (3).

4. The energy storage battery pack for reducing the risk of thermal runaway of battery cells according to claim 1, characterized in that: The invention also includes an aerosol fire extinguishing device (8) arranged inside the battery pack box (1), the aerosol fire extinguishing device (8) including an aerosol fire extinguisher and a controller for controlling the aerosol fire extinguisher to spray aerosol, and a detection unit connected to the controller, the detection unit including a temperature sensing line (801) arranged around the outer side of the battery PACK (2) for detecting the temperature of the battery PACK (2) and sending the detected temperature signal to the controller, and the controller controls whether the aerosol fire extinguisher is turned on according to the comparison between the received temperature signal and the preset temperature.

5. The energy storage battery pack for reducing the risk of thermal runaway of battery cells according to claim 1, characterized in that: The battery pack box (1) comprises a bottom liquid cooling plate (9) and a shell (10) mounted on the bottom liquid cooling plate (9), and a fireproof coating (11) is sprayed on the inner surface of the shell (10).

6. The energy storage battery pack for reducing the risk of thermal runaway of battery cells according to claim 5, characterized in that: A fire-fighting bracket (13) for fixing an aerosol fire-extinguishing device (8) is installed on the bottom liquid-cooling plate (9). The fire-fighting bracket (13) includes a fixing bracket (131) and a mounting bracket (132) located in the middle of the fixing bracket (131). The lower end of the fixing bracket (131) is fixed to the upper end surface of the bottom liquid-cooling plate (9). The aerosol fire extinguisher is arranged in the mounting bracket (132) and the end of the temperature sensing line (801) is connected to the aerosol fire extinguisher through a wiring harness.

7. The energy storage battery pack for reducing the risk of thermal runaway of battery cells according to claim 6, characterized in that: The mounting frame (132) is in the shape of a rectangular frame and is provided with first connecting ears (133) on both sides. The fixing frame (131) is in the shape of a plate and is provided with a rectangular through hole (134) in the middle for the mounting frame (132) to extend into. The fixing frame (131) is also provided with a bolt hole (135) connected to the first connecting ear (133) by bolts and a second connecting ear (136) connected to the bottom liquid cooling plate (9) by bolts.

8. The energy storage battery pack for reducing the risk of thermal runaway of battery cells according to claim 6, characterized in that: The front end surface of the battery pack box (1) is provided with a PACK front end plate (12), the PACK front end plate (12) is provided with an inspection port (15) corresponding to the aerosol fire extinguishing device (8), and an inspection cover plate (14) is installed at the inspection port (15).

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