Lithium battery module with fire extinguishing self-protection function

Abstract

The utility model relates to the technical field of modularization battery, disclose lithium battery module with fire extinguishing self -preservation function, including the shell, the shell upper surface is provided with the apron, the apron inner wall is provided with fire extinguishing power -off subassembly, the shell inner wall is provided with the battery body, the battery body upper surface is provided with the busbar, the shell outer wall is provided with the anti -drop explosion -proof subassembly, the fire extinguishing power -off subassembly includes the fire extinguishing cylinder, the fire extinguishing cylinder outer wall fixedly connected in the apron inner wall, the apron inner wall is fixedly connected with the support station, the support station inner wall is fixedly connected with the temperature sensing closed head. In the utility model, the fire detector can accurately capture temperature anomaly, timely control the gate body cut off circuit, avoid the circuit continuous energization aggravate the fire, the temperature sensing closed head is under high temperature and explodes and releases dry powder in the fire extinguishing cylinder, quickly covers the battery body and the busbar, effectively puts out the open fire and prevents the rekindling, reduces the fire hazard caused by lithium battery thermal runaway.

Description

Technical Field

[0001] This utility model relates to the field of modular battery technology, and in particular to a lithium battery module with fire extinguishing and self-protection functions. Background Technology

[0002] With the rapid development of new energy technologies, lithium battery modules are widely used in electric vehicles, energy storage power stations, aerospace, and other fields due to their advantages such as high energy density and long cycle life. However, lithium batteries are susceptible to thermal runaway during use. Internal short circuits, overcharging, over-discharging, or exposure to high external temperatures can easily lead to fires or even explosions. Therefore, developing lithium battery modules with efficient fire extinguishing and self-protection functions has become a key technological requirement for ensuring safe equipment operation and reducing disaster losses.

[0003] Existing fire suppression technologies for lithium battery modules largely rely on electronically controlled sensors and extinguishing devices. For example, temperature sensors monitor cell temperature, and when the temperature exceeds a threshold, a signal is triggered to open a solenoid valve to release the extinguishing medium. In terms of mechanical structure, some modules use simple metal shells or foam buffer layers for protection. Furthermore, the extinguishing medium storage structure of traditional fire suppression devices is relatively fixed, usually a sealed container, relying on electronic commands to open valves to release the extinguishing material. In the early stages of battery thermal runaway, it is difficult to achieve a rapid and effective fire suppression response.

[0004] However, existing electronically controlled fire suppression systems have significant drawbacks. If a lithium battery experiences thermal runaway leading to circuit damage, temperature sensors are prone to failure, making it difficult to send timely fire suppression commands. Electronically controlled release devices such as solenoid valves may also fail to open due to power outages, hindering the release of the extinguishing agent and causing the fire to spread rapidly. Simultaneously, traditional mechanical protective structures are unable to withstand high-intensity external impacts. Upon impact or drop, the internal cells of the lithium battery module are easily damaged, increasing the risk of thermal runaway. Existing technologies struggle to simultaneously meet the dual requirements of efficient fire suppression and reliable protection. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a lithium battery module with fire extinguishing self-protection function, which aims to improve the problems of fire expansion, slow fire extinguishing response, and weak mechanical protection caused by the continuous power supply of the circuit during thermal runaway of traditional lithium battery modules.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a lithium battery module with fire extinguishing and self-protection function, including a shell, a cover plate provided on the upper surface of the shell, a fire extinguishing and power-off component provided on the inner wall of the cover plate, a battery body provided on the inner wall of the shell, a busbar provided on the upper surface of the battery body, and a drop-proof and explosion-proof component provided on the outer wall of the shell.

[0007] The fire extinguishing and power-off assembly includes a fire extinguishing cylinder, the outer wall of which is fixedly connected to the inner wall of a cover plate. A support platform is fixedly connected to the inner wall of the cover plate, and a temperature-sensing sealing head is fixedly connected to the inner wall of the support platform. A fire detector is installed on the upper side of the inner wall of the cover plate. A switch box is installed on one side of the outer wall of the outer shell. A receiver is installed on the inner wall of the switch box. A switch body is rotatably connected to the inner wall of the switch box, and a spring is fixedly connected to the outer wall of the receiver.

[0008] Furthermore, the anti-drop and explosion-proof component includes eight anti-drop pads, which are disposed at the eight apex corners of the outer wall of the outer shell. Vertical reinforcing ribs are provided between the anti-drop pads, and horizontal reinforcing ribs are provided between the anti-drop pads. An elastic column is fixedly connected to the inner wall of each of the eight anti-drop pads, and a buffer pad is fixedly connected to one end of the elastic column.

[0009] Furthermore, eight buffer pads are provided, and the outer walls of all eight buffer pads are slidably connected to the inner wall of the anti-fall pad.

[0010] Furthermore, the inner wall of the transverse reinforcing rib is disposed on the outer wall of the outer shell, and the inner wall of the vertical reinforcing rib is disposed on the outer wall of the outer shell.

[0011] Furthermore, one end of the temperature-sensing sealing head is located on the inner wall of the fire extinguishing cylinder, and the temperature-sensing sealing head is used to seal the fire extinguishing cylinder.

[0012] Furthermore, the fire extinguishing cylinder is equipped with drying powder, which is used for fire extinguishing.

[0013] Furthermore, one end of the spring is fixedly connected to the inner wall of the switch body, and the spring is used to pull the switch body to rotate.

[0014] Furthermore, the fire detector is positioned above the manifold, and both the fire extinguishing tube and the temperature-sensing sealing head are positioned above the manifold.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, the fire detector can accurately detect temperature anomalies and promptly control the switch body to cut off the circuit, preventing the fire from intensifying due to continuous power supply to the circuit. The temperature-sensing sealing head explodes at high temperature, releasing the dry powder inside the fire extinguishing tube, which quickly covers the battery body and busbar, effectively extinguishing the open flame and preventing reignition, thus reducing the fire hazards caused by thermal runaway of lithium batteries.

[0017] 2. In this utility model, the anti-drop pads at the eight corners of the outer shell, together with the elastic pillars and buffer pads, can effectively absorb impact energy. The horizontal and vertical reinforcing ribs enhance the structural strength of the outer shell, significantly reducing the risk of damage to the battery body due to external impact, improving the safety and stability of the module during transportation and use, and extending its service life. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the lithium battery module with fire extinguishing and self-protection function proposed in this utility model.

[0019] Figure 2 This is a schematic diagram of the cover plate structure of the lithium battery module with fire extinguishing and self-protection function proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the support platform structure of the lithium battery module with fire extinguishing and self-protection function proposed in this utility model.

[0021] Figure 4 This is a schematic diagram of the battery body of the lithium battery module with fire extinguishing and self-protection function proposed in this utility model.

[0022] Figure 5 This is a schematic diagram of the spring portion of the lithium battery module with fire extinguishing and self-protection function proposed in this utility model.

[0023] Figure 6 This is a schematic diagram of the elastic column portion of the lithium battery module with fire extinguishing and self-protection function proposed in this utility model.

[0024] Legend:

[0025] 1. Outer shell; 2. Cover plate; 3. Anti-drop pad; 4. Horizontal reinforcing rib; 5. Vertical reinforcing rib; 6. Switch box; 7. Switch body; 8. Fire detector; 9. Fire extinguisher; 10. Temperature sensing sealing head; 11. Support platform; 12. Battery body; 13. Busbar; 14. Receiver; 15. Spring; 16. Elastic column; 17. Buffer pad. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figures 1-5 An embodiment of this utility model is provided: a lithium battery module with fire extinguishing and self-protection function, including a shell 1, a cover plate 2 is provided on the upper surface of the shell 1, a fire extinguishing and power-off component is provided on the inner wall of the cover plate 2, a battery body 12 is provided on the inner wall of the shell 1, a busbar 13 is provided on the upper surface of the battery body 12, and a drop-proof and explosion-proof component is provided on the outer wall of the shell 1.

[0028] The fire extinguishing and power-off assembly includes a fire extinguishing cylinder 9, which stores dry powder extinguishing agent. A temperature-sensing sealing head 10 seals the fire extinguishing cylinder 9 at room temperature. When the temperature reaches a threshold higher than the normal operating temperature, it expands and bursts, releasing dry powder to cover the battery body 12 and the busbar 13, thus achieving fire extinguishing and flame retardancy. The outer wall of the fire extinguishing cylinder 9 is fixedly connected to the inner wall of the cover plate 2. A support platform 11 is fixedly connected to the inner wall of the cover plate 2. The temperature-sensing sealing head 10 is fixedly connected to the inner wall of the support platform 11. A fire detector 8 is installed on the upper side of the inner wall of the cover plate 2. A switch box 6 is installed on one side of the outer wall of the outer shell 1. A receiver 14 is installed on the inner wall of the switch box 6. A switch body 7 is rotatably connected to the inner wall of the switch box 6. A spring 15 is fixedly connected to the outer wall of the receiver 14. When triggered, the spring 15 generates tension, pulling the switch body 7 to rotate, cutting off the circuit and preventing the fire from spreading due to continuous current.

[0029] Specifically, during the operation of the lithium battery module, the fire detector 8 monitors the temperature in real time. Once an abnormal temperature is detected, it immediately sends a signal to the receiver 14. The receiver 14 triggers the spring 15, which pulls the switch body 7 to rotate, quickly cutting off the circuit and preventing the circuit from continuing to be powered, which would cause the fire to intensify. At the same time, the high temperature causes the temperature-sensing sealing head 10 to expand and burst, releasing the seal on the fire extinguishing cylinder 9. Under the action of gravity or internal pressure, the dry powder inside the fire extinguishing cylinder 9 falls quickly to cover the busbar 13 and the battery body 12, extinguishing the open flame and preventing reignition. The design of the temperature-sensing sealing head 10 can ensure that it will not be falsely triggered when the battery module is working normally and generating heat.

[0030] Reference Figures 1-6 The anti-drop and explosion-proof component includes eight anti-drop pads 3, distributed at the eight apex corners of the outer casing 1. These pads absorb impact energy through elastic pillars 16 and buffer pads 17, reducing the impact of external forces on the battery body 12. The eight anti-drop pads 3 are located at the eight apex corners of the outer wall of the outer casing 1. Vertical reinforcing ribs 5 are provided between the anti-drop pads 3 to enhance the structural strength of the outer casing 1, preventing deformation under impact or compression and protecting the internal battery body 12. Horizontal reinforcing ribs 4 are also provided between the anti-drop pads 3. Elastic pillars 16 are fixedly connected to the inner walls of each of the eight anti-drop pads 3, and buffer pads 17 are fixedly connected to one end of each elastic pillar 16. Eight buffer pads 17 are provided, and the outer walls of the eight buffer pads 17 are slidably connected to the inner wall of the anti-fall pad 3. The inner wall of the horizontal reinforcing rib 4 is provided on the outer wall of the outer shell 1, and the inner wall of the vertical reinforcing rib 5 is provided on the outer wall of the outer shell 1. One end of the temperature-sensing sealing head 10 is provided on the inner wall of the fire extinguishing cylinder 9. The temperature-sensing sealing head 10 is used to seal the fire extinguishing cylinder 9. The fire extinguishing cylinder 9 is filled with drying powder, which is used for fire extinguishing. One end of the spring 15 is fixedly connected to the inner wall of the switch body 7. The spring 15 is used to pull the switch body 7 to rotate. The fire detector 8 is provided above the busbar 13. The fire extinguishing cylinder 9 and the temperature-sensing sealing head 10 are both provided above the busbar 13.

[0031] Specifically, the elastic pillars 16 and buffer pads 17 inside the eight corner anti-drop pads 3 of the outer shell 1 work together to effectively absorb and disperse the impact force when the module is impacted. The vertical reinforcing ribs 5 and the horizontal reinforcing ribs 4 further strengthen the structural strength of the outer shell 1, reduce the risk of deformation of the outer shell 1 caused by external impact, and prevent the battery body 12 from being damaged due to the deformation of the outer shell 1.

[0032] Working principle: When the lithium battery module with fire extinguishing self-protection function is needed, the fire detector 8 detects the abnormal temperature and sends a signal to the receiver 14, triggering the spring 15 to pull the switch body 7 to rotate and cut off the circuit. At the same time, the temperature-sensing sealing head 10 expands due to high temperature and bursts, releasing the seal on the fire extinguishing cylinder 9. The dry powder inside the fire extinguishing cylinder 9 falls and covers the busbar 13 and the battery body 12 under the action of gravity or internal pressure, realizing fire extinguishing and preventing reignition. The temperature-sensing sealing head 10 will not expand due to the heat generated by the battery module during normal operation and burst.

[0033] In addition, the anti-drop pads 3 at the eight corners of the outer casing 1 absorb and disperse the impact force when the module is hit by an impact through the cooperation of the internal elastic pillars 16 and buffer pads 17. The vertical reinforcing ribs 5 and the horizontal reinforcing ribs 4 further enhance the structural strength of the outer casing 1 and prevent the outer casing 1 from deforming and damaging the battery body 12.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lithium battery module with fire extinguishing and self-protection function, comprising a casing (1), characterized in that: The upper surface of the outer shell (1) is provided with a cover plate (2), the inner wall of the cover plate (2) is provided with a fire extinguishing and power cut-off component, the inner wall of the outer shell (1) is provided with a battery body (12), the upper surface of the battery body (12) is provided with a busbar (13), and the outer wall of the outer shell (1) is provided with a drop-proof and explosion-proof component. The fire extinguishing and power-off assembly includes a fire extinguishing cylinder (9), the outer wall of which is fixedly connected to the inner wall of the cover plate (2), a support platform (11) is fixedly connected to the inner wall of the cover plate (2), a temperature-sensing sealing head (10) is fixedly connected to the inner wall of the support platform (11), a fire detector (8) is provided on the upper side of the inner wall of the cover plate (2), a switch box (6) is provided on one side of the outer wall of the outer shell (1), a receiver (14) is provided on the inner wall of the switch box (6), a switch body (7) is rotatably connected to the inner wall of the switch box (6), and a spring (15) is fixedly connected to the outer wall of the receiver (14).

2. The lithium battery module with fire extinguishing and self-protection function according to claim 1, characterized in that: The anti-fall and explosion-proof component includes eight anti-fall pads (3), which are arranged at the eight top corners of the outer wall of the outer shell (1). Vertical reinforcing ribs (5) are provided between the anti-fall pads (3) and horizontal reinforcing ribs (4) are provided between the anti-fall pads (3). Elastic columns (16) are fixedly connected to the inner walls of the eight anti-fall pads (3), and a buffer pad (17) is fixedly connected to one end of the elastic column (16).

3. The lithium battery module with fire extinguishing and self-protection function according to claim 2, characterized in that: Eight buffer pads (17) are provided, and the outer walls of the eight buffer pads (17) are slidably connected to the inner wall of the anti-fall pad (3).

4. The lithium battery module with fire extinguishing and self-protection function according to claim 2, characterized in that: The inner wall of the transverse reinforcing rib (4) is disposed on the outer wall of the outer shell (1), and the inner wall of the vertical reinforcing rib (5) is disposed on the outer wall of the outer shell (1).

5. The lithium battery module with fire extinguishing and self-protection function according to claim 1, characterized in that: One end of the temperature-sensing sealing head (10) is located on the inner wall of the fire extinguishing cylinder (9), and the temperature-sensing sealing head (10) is used to seal the fire extinguishing cylinder (9).

6. The lithium battery module with fire extinguishing and self-protection function according to claim 1, characterized in that: The fire extinguishing cylinder (9) contains drying powder, which is used for fire extinguishing.

7. The lithium battery module with fire extinguishing and self-protection function according to claim 1, characterized in that: One end of the spring (15) is fixedly connected to the inner wall of the knife switch body (7), and the spring (15) is used to pull the knife switch body (7) to rotate.

8. The lithium battery module with fire extinguishing and self-protection function according to claim 1, characterized in that: The fire detector (8) is positioned above the manifold (13), and the fire extinguishing tube (9) and the temperature-sensing sealing head (10) are both positioned above the manifold (13).

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