Battery module and energy storage device thereof
By installing a pressure relief structure and an aerosol fire extinguishing unit on the battery module box, the problem of fire and explosion caused by thermal runaway of the battery module is solved, the dual protection of safe pressure relief and fire extinguishing is achieved, and the safety of the energy storage system is improved.
Patent Information
- Application Number
- CN202422357563.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-09-26
AI Technical Summary
The battery modules of energy storage devices in a sealed environment may be susceptible to problems such as short circuit, overcharge, over-discharge, and thermal runaway, which may cause fire or explosion. Existing technologies lack effective safety protection measures.
A pressure relief structure is installed on the battery module box, and is equipped with an aerosol fire extinguishing unit and a thermal wire. The thermal wire starts pressure relief in the event of thermal runaway, and the aerosol fire extinguishing unit sprays fire extinguishing agent to extinguish the fire, prevent explosion, and release pressure through the pressure relief structure.
It effectively prevents battery modules from exploding due to thermal runaway, and improves the safety of the energy storage system through dual measures of pressure relief and fire extinguishing.
Smart Images
Figure CN223333946U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery energy storage, in particular to a battery module and an energy storage device thereof. Background Art
[0002] The high energy density and charge / discharge characteristics of battery modules in energy storage devices, such as energy storage containers, pose certain safety risks. During operation, battery cells may experience short circuits, overcharge, overdischarge, thermal runaway, and other issues, potentially causing fires or explosions. These risks can be magnified, particularly in well-sealed environments, increasing the severity of safety incidents. Therefore, effective measures must be taken to ensure the safety of energy storage systems. Utility Model Content
[0003] The purpose of the present utility model is to provide a battery module and an energy storage device thereof, wherein a pressure relief structure is installed on a box body, so that when thermal runaway occurs in a battery cell, pressure can be relieved through the pressure relief structure to prevent explosion.
[0004] To achieve the above objectives, the present invention provides a battery module, including a box body, wherein a battery unit and a fire extinguishing device are installed inside the box body, and the fire extinguishing device includes an aerosol fire extinguishing unit and a thermal wire. A pressure relief structure is also installed on the box body.
[0005] The aerosol fire extinguishing unit is located on one side of the pressure relief structure, the heat-sensitive wire is coiled in the box, and the heat-sensitive wire is connected to the aerosol fire extinguishing unit.
[0006] The thermal wire is wrapped around the box.
[0007] The thermal wire is located on top of the battery cell.
[0008] The thermal wire is located on the side of the battery cell.
[0009] The thermal wire is coiled in an "S" shape on the top of the battery cell.
[0010] The thermal wire is installed and fixed by a wire buckle.
[0011] The aerosol fire extinguishing unit further has a feedback signal line, which is electrically connected to the battery management system.
[0012] The pressure relief structure includes a pressure relief valve or a pressure relief diaphragm.
[0013] An energy storage device comprises the battery module described above.
[0014] Compared with the prior art, the present invention has the following technical effects:
[0015] 1. The utility model has a pressure relief structure installed on the box body. When thermal runaway occurs in the battery unit, the pressure can be relieved through the pressure relief structure to prevent explosion.
[0016] 2. The aerosol fire extinguishing unit of the present invention is located on one side of the pressure relief structure and can extinguish the flame that is about to be ejected from the pressure relief structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description:
[0018] Figure 1 This is a schematic structural diagram of the first embodiment of the present utility model;
[0019] Figure 2 This is a schematic structural diagram of the second embodiment of the present utility model;
[0020] Figure 3 This is a schematic side view of the structure of the utility model.
[0021] Reference numerals:
[0022] Box body 1, battery unit 2, pressure relief structure 3, aerosol fire extinguishing unit 4, thermal wire 5, wire buckle 6, feedback signal wire 7. DETAILED DESCRIPTION
[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.
[0024] Example 1:
[0025] See Figure 1-3 A battery module includes a housing 1, within which are mounted battery cells 2 and a fire extinguishing device comprising an aerosol fire extinguishing unit 4 and a thermal wire 5. A pressure relief structure 3 is also mounted on the housing 1. By mounting the pressure relief structure 3 on the housing 1, pressure can be relieved through the pressure relief structure 3 in the event of thermal runaway of the battery cells 2, thereby preventing explosions.
[0026] Furthermore, the aerosol fire extinguishing unit 4 is located on one side of the pressure relief structure 3 and is close to the pressure relief structure 3. The thermal wire 5 is coiled in the box body 1 and passes through each battery cell 2. The thermal wire 5 is connected to the aerosol fire extinguishing unit 4. By installing the aerosol fire extinguishing unit 4 on one side of the pressure relief structure 3 in the box body, the flame that is about to be ejected from the pressure relief structure 3 can be effectively extinguished. Specifically, when the aerosol fire extinguishing unit 4 extinguishes a fire, on the one hand, the aerosol fire extinguishing agent generated by the aerosol generator adopts the principle of chemical fire extinguishing. The released potassium ions and strontium ions can capture free radicals and prevent the chain reaction caused by the fire; on the other hand, the aerosol fire extinguishing device will also release some inert gases such as nitrogen, carbon dioxide, etc., which can fully dilute the combustible gas. Due to the above two reasons, the flame that is about to be ejected from the pressure relief structure 3 can be extinguished.
[0027] The aerosol fire extinguishing unit 4 is a prior art, and the thermal line 5 is a purchased finished product. The pressure relief structure 3 can also be a pressure relief valve or a pressure relief diaphragm. The pressure relief structure 3 is installed on the corresponding mounting hole of the box body 1.
[0028] See also Figure 1 , the thermal wire 5 is wrapped around the box 1.
[0029] exist Figure 1 In the embodiment, the thermal line 5 is located at the top of the battery cell 2. The thermal line 5 can be located in the center of the battery cell 2 or can surround the inner wall of the box body 1. Figure 1 Schematic diagram of the thermal wire 5 wrapped around the inner wall of the box 1 is shown in FIG.
[0030] In another side solution, the thermal wire 5 is located on the side of the battery cell 2. In this solution, the thermal wire 5 surrounds the inner wall of the box body 1 and is located in the middle of the side of the battery cell 2.
[0031] In order to facilitate the fixation of the thermal wire 5, the thermal wire 5 is fixed by a wire buckle 6. As needed, the wire buckle 6 can be attached to the inner wall of the box body 1 or to the battery unit 2.
[0032] For further information, see Figure 3 The aerosol fire extinguishing unit 4 also has a feedback signal line 7, which is electrically connected to the battery management system. The feedback signal line 7 outputs a feedback signal to the PCS battery management system.
[0033] Example 2:
[0034] The difference from the first embodiment is that, see Figure 2 The thermal wire 5 is coiled in an "S" shape on the top of the battery cell 2. With this structure, a longer thermal wire can be used, but the detection range can be larger and more accurate.
[0035] Furthermore, the “S” shape of the thermal wire 5 may also be folded back and forth multiple times and coiled around the top of the battery unit 2 .
[0036] Example 3:
[0037] An energy storage device includes the aforementioned battery module. The energy storage device may be an energy storage container or an energy storage cabinet.
[0038] The working principle or action process of the utility model is as follows:
[0039] When thermal runaway occurs in the battery cell 2 , the pressure in the box body 1 increases. When the pressure is greater than the threshold value that the pressure relief structure 3 can withstand, the pressure relief structure 3 opens to relieve the pressure to prevent explosion.
[0040] The aerosol fire extinguishing unit 4 is installed inside the box, on one side of the pressure relief structure 3. It can be attached to the inner wall of the box 1 or bolted to the inner wall. When the temperature inside the box 1 reaches approximately 185°C, the activation temperature of the thermosensitive wire, the thermosensitive wire 5 undergoes an oxidation-reduction reaction, triggering the aerosol fire extinguishing unit 4 to release the flames that are about to burst from the pressure relief structure 3.
Claims
1. A battery module, comprising a box (1), wherein a battery unit (2) and a fire extinguishing device are installed inside the box (1), wherein the fire extinguishing device comprises an aerosol fire extinguishing unit (4) and a heat-sensitive wire (5), and is characterized in that: A pressure relief structure (3) is also installed on the box body (1).
2. The battery module according to claim 1, wherein: The aerosol fire extinguishing unit (4) is located on one side of the pressure relief structure (3), the heat-sensitive wire (5) is coiled in the box (1), and the heat-sensitive wire (5) is connected to the aerosol fire extinguishing unit (4).
3. The battery module according to claim 2, wherein: The thermal wire (5) is wrapped around the box (1).
4. The battery module according to claim 3, wherein: The thermal wire (5) is located on the top of the battery cell (2).
5. The battery module according to claim 3, characterized in that: The thermal line (5) is located on the side of the battery unit (2).
6. The battery module according to claim 2, wherein: The thermal wire (5) is coiled in an "S" shape on the top of the battery cell (2).
7. A battery module according to any one of claims 1 to 6, characterized in that: The thermal wire (5) is installed and fixed via a wire buckle (6).
8. The battery module according to claim 1, wherein: The aerosol fire extinguishing unit (4) further comprises a feedback signal line (7), and the feedback signal line (7) is electrically connected to the battery management system.
9. The battery module according to claim 1, characterized in that: The pressure relief structure (3) comprises a pressure relief valve or a pressure relief diaphragm.
10. An energy storage device, characterized in that: A battery module comprising any one of claims 1 to 9.