Lithium ion battery module

Abstract

The utility model discloses a lithium ion battery module which comprises an explosion-proof shell, the explosion-proof shell comprises an explosion-proof lower shell and an explosion-proof upper shell covering the explosion-proof lower shell, a battery cell and a battery management system electrically connected with the battery cell are arranged in the explosion-proof shell, and a fire extinguishing agent storage part is flatly laid above the battery cell. The fire extinguishing agent storage part can be broken when the temperature in the explosion-proof shell is larger than a first preset value, a fire extinguishing material is arranged in the fire extinguishing agent storage part so that the fire extinguishing material can be sprayed to the battery cell when the fire extinguishing agent storage part is broken, a buzzer alarm is further arranged in the explosion-proof shell, and the buzzer alarm is electrically connected with one end of a thermosensitive metal wire; and the other end of the thermosensitive metal wire is electrically connected with the battery management system so as to give an alarm sound when the temperature in the explosion-proof shell is greater than a second preset value. According to the utility model, the fire extinguishing agent storage part, the buzzer alarm and the explosion-proof shell are arranged, so that the lithium ion battery module is effectively extinguished and alarmed, the safety coefficient is high, and the personal safety is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lithium-ion battery module. Background Art

[0002] Lithium-ion batteries are prone to fire and explosion accidents when they are subjected to abnormal conditions such as high temperature burning, heavy object impact, puncture, short circuit, overcharge, etc. Existing lithium-ion battery modules only provide battery safety protection through the disconnection of the CID explosion-proof valve of the single cell and the power-off control measures of the module circuit board. The insurance coefficient is low and the safety risk is high. Summary of the invention

[0003] The utility model aims to provide a lithium-ion battery module to solve the problems of low safety coefficient and high safety risk of the existing lithium-ion battery module.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a lithium-ion battery module, including an explosion-proof shell, the explosion-proof shell including an explosion-proof lower shell and an explosion-proof upper shell covering the explosion-proof lower shell, the explosion-proof shell is provided with a battery cell and a battery management system electrically connected to the battery cell, a fire extinguishing agent storage unit is arranged flat above the battery cell, the fire extinguishing agent storage unit can be ruptured when the temperature in the explosion-proof shell is greater than a first preset value, the fire extinguishing agent storage unit is provided with fire extinguishing material so that the fire extinguishing material is sprayed toward the battery cell when the fire extinguishing agent storage unit is ruptured, and a buzzer alarm is also arranged in the explosion-proof shell, the buzzer alarm is electrically connected to one end of a thermosensitive metal wire, and the other end of the thermosensitive metal wire is electrically connected to the battery management system so as to emit an alarm sound when the temperature in the explosion-proof shell is greater than a second preset value.

[0005] Preferably, the main body of the explosion-proof upper shell is one of steel plate, cast steel, and cast iron, and a layer of ultra-high molecular weight polyethylene fiber material is also provided on the main surface of the explosion-proof upper shell; the main body of the explosion-proof lower shell is one of steel plate, cast steel, and cast iron, and a layer of ultra-high molecular weight polyethylene fiber material is also provided on the main surface of the explosion-proof lower shell.

[0006] Preferably, the fire extinguishing agent is one of water, difluoromonochloromonobromomethane, carbon dioxide, and dry powder fire extinguishing agent.

[0007] Preferably, the buzzer alarm is a power-off alarm, and the thermosensitive metal wire is a first thermosensitive metal wire, which melts when the temperature in the explosion-proof housing reaches the second preset value to cause the buzzer alarm to sound an alarm.

[0008] Preferably, the buzzer alarm is a power-on alarm, and the thermistor is a second thermistor. When the temperature in the explosion-proof housing is lower than the second preset value, the second thermistor has a larger resistance so that the power-on alarm does not work. When the temperature in the explosion-proof housing reaches the second preset value, the resistance of the second thermistor decreases and the buzzer alarm sounds.

[0009] Preferably, the fire extinguishing agent storage unit and the buzzer alarm are fixed side by side on the inner surface of the explosion-proof upper shell.

[0010] Preferably, the fire extinguishing agent storage portion is made of a thermally decomposable material.

[0011] Preferably, a sealing member is provided between the explosion-proof upper shell and the explosion-proof lower shell so that the explosion-proof upper shell and the explosion-proof lower shell are sealed and connected.

[0012] Compared with the prior art, the utility model provides a fire extinguishing agent storage unit, a buzzer alarm and an explosion-proof shell to effectively extinguish the fire of the lithium-ion battery module and issue an alarm reminder. In addition, the explosion-proof shell has a certain barrier effect on the explosion, reducing or avoiding the explosion hazard to ensure human safety. The lithium-ion battery module of the utility model has a high safety factor and effectively ensures personal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the lithium-ion battery module of the utility model.

[0014] Figure 2 The figure is a schematic diagram of the internal structure of the lithium-ion battery module of the utility model. DETAILED DESCRIPTION

[0015] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0016] like Figure 1 to Figure 2As shown, an embodiment of the utility model provides a lithium-ion battery module, including an explosion-proof shell 1, the explosion-proof shell 1 includes an explosion-proof lower shell 11 and an explosion-proof upper shell 12 covering the explosion-proof lower shell 11, a battery cell 5 and a battery management system 4 electrically connected to the battery cell 5 are arranged in the explosion-proof shell 1, a fire extinguishing agent storage part 2 is arranged flat above the battery cell 5, the fire extinguishing agent storage part 2 can be broken when the temperature in the explosion-proof shell 1 is greater than a first preset value, a fire extinguishing material is arranged in the fire extinguishing agent storage part 2 so that the fire extinguishing material is sprayed toward the battery cell 5 when the fire extinguishing agent storage part 2 is broken, and a buzzer alarm 3 is also arranged in the explosion-proof shell 1, the buzzer alarm 3 is electrically connected to one end of the thermistor wire 6, and the other end of the thermistor wire 6 is electrically connected to the battery management system 4 so as to emit an alarm sound when the temperature in the explosion-proof shell 1 is greater than a second preset value.

[0017] Specifically, the first preset value and the second preset value can both be set to 200 degrees. Of course, the specific data of the first preset value and the second preset value can be designed and selected according to actual needs. For example, the first preset value can be set to be slightly larger than the second preset value, that is, the buzzer alarm starts to alarm before the fire extinguishing agent storage part 2 ruptures, to remind timely processing. When the battery cell 5 is subjected to abnormal conditions such as high temperature burning, heavy object impact, puncture, short circuit, overcharge, etc., it is easy to cause safety accidents such as fire and explosion. Although the CID (explosion-proof valve) is disconnected or the explosion-proof aluminum sheet is disconnected after the initial reaction and gas production, some of the battery cells 5 can be controlled to no longer react further, but in severe situations such as severe abnormal temperature rise or heavy object impact, the CID disconnection can no longer play a protective role. At this time, the fire extinguishing material in the fire extinguishing agent storage part 2 is required to cover the battery cell 5 to achieve the effect of cooling the battery cell 5 and extinguishing the fire. In the case of more severe damage, the battery cell 5 or the module may explode. At this time, the explosion-proof housing 1 can have a certain barrier effect on the explosion, reduce or avoid the explosion hazard, and ensure human safety. In addition, a buzzer alarm 3 is also provided in the explosion-proof housing 1, which can sound an alarm when the temperature in the explosion-proof housing 1 is greater than a second preset value, so as to remind personnel to stay away or perform maintenance.

[0018] The embodiment of the utility model is provided with a fire extinguishing agent storage unit 2, a buzzer alarm 3 and an explosion-proof shell 1, so as to effectively extinguish the fire of the lithium-ion battery module and issue an alarm reminder. In addition, the explosion-proof shell 1 has a certain barrier effect on the explosion, reduces or avoids the explosion hazard, and ensures the safety of people. The lithium-ion battery module of the embodiment of the utility model has a high safety factor and effectively ensures personal safety.

[0019] In the embodiment of the utility model, the main body of the explosion-proof upper shell 12 is one of steel plate, cast steel, and cast iron, and a layer of ultra-high molecular weight polyethylene fiber material is also provided on the main surface of the explosion-proof upper shell 12; the main body of the explosion-proof lower shell 11 is one of steel plate, cast steel, and cast iron, and a layer of ultra-high molecular weight polyethylene fiber material is also provided on the main surface of the explosion-proof lower shell 11.

[0020] Specifically, the main bodies of the explosion-proof upper shell 12 and the explosion-proof lower shell 11 are both made of one of steel plates, cast steel, and cast iron. The structure of the explosion-proof shell 1 is more solid. The ultra-high molecular weight polyethylene (UHMWPE) fiber is spun from a polyethylene resin with a molecular weight of more than 1 million. It is the third generation of high-performance fibers after carbon fiber and aramid fiber. It has ultra-high strength, ultra-high modulus, low density, wear resistance, low temperature resistance, UV resistance, shielding resistance, good flexibility, high impact energy absorption, and resistance to strong acids, strong alkalis, chemical corrosion, breathability and many other excellent properties. Its application in the present application can further improve the structural strength and anti-puncture and impact resistance of the explosion-proof shell 1. In addition, a high-strength coated fabric layer is provided between the main body of the explosion-proof upper shell 12 and the ultra-high molecular weight polyethylene fiber material layer, and a high-strength coated fabric layer is also provided between the main body of the explosion-proof lower shell 11 and the ultra-high molecular weight polyethylene fiber material layer. The high-strength coated fabric layer includes a flame retardant layer and a waterproof layer, which further ensures the explosion-proof performance of the explosion-proof shell 1. This explosion-proof shell 1 is environmentally friendly and non-toxic, has no natural harm to the human body, and will not cause harm to the human body even if used for a long time.

[0021] In the embodiment of the utility model, the fire extinguishing agent is one of water, difluoromonochloromonobromomethane, carbon dioxide, and dry powder fire extinguishing agent. Specifically, the specific type of the fire extinguishing agent is not limited, for example, it can also be nitrogen and / or inert gas.

[0022] In the embodiment of the utility model, the buzzer alarm 3 is a power-off alarm, and the thermosensitive metal wire 6 is a first thermosensitive metal wire. When the temperature in the explosion-proof housing 1 reaches a second preset value, the first thermosensitive metal wire melts to cause the buzzer alarm 3 to alarm. Specifically, the buzzer alarm 3 is an alarm that works when the power is off. The buzzer alarm 3 can be purchased directly as long as it can withstand a high temperature exceeding the second preset value. When the temperature reaches the second preset value, the first thermosensitive metal wire melts to cause the buzzer alarm 3 to alarm.

[0023] In some other specific implementations of the utility model embodiment, the buzzer alarm 3 is a power-on alarm, and the thermistor wire 6 is a second thermistor wire. When the temperature in the explosion-proof housing 1 is lower than the second preset value, the second thermistor wire has a larger resistance so that the power-on alarm does not work. When the temperature in the explosion-proof housing 1 reaches the second preset value, the resistance of the second thermistor wire decreases so that the buzzer alarm 3 alarms. Specifically, the buzzer alarm 3 is an alarm that works when powered on. The buzzer alarm 3 can be purchased directly. When the temperature in the explosion-proof housing 1 is lower than the second preset value, the resistance of the second thermistor wire is larger, and when the temperature reaches the second preset value, the resistance of the second thermistor wire is smaller. At this time, the circuit is turned on, and current passes through. The buzzer alarm 3 is turned on and an alarm sound is sounded. In addition, the buzzing sound of the buzzer alarm 3 increases with the increase of current.

[0024] In the embodiment of the utility model, the fire extinguishing agent storage part 2 and the buzzer alarm 3 are fixed side by side on the inner surface of the explosion-proof upper shell 12. Specifically, the inner surface of the explosion-proof upper shell 12 is provided with installation positions for the fire extinguishing agent storage part 2 and the buzzer alarm 3. The fire extinguishing agent storage part 2 and the buzzer alarm 3 are arranged side by side to avoid the fire extinguishing material from affecting the buzzer alarm 3.

[0025] In the embodiment of the utility model, the fire extinguishing agent storage part 2 is made of a thermally decomposable material so that when a first preset value is reached, the fire extinguishing agent storage part 2 is thermally decomposed, thereby causing the fire extinguishing material to be ejected to extinguish a fire.

[0026] In the embodiment of the utility model, a seal is provided between the explosion-proof upper shell 12 and the explosion-proof lower shell 11 so that the explosion-proof upper shell 12 is sealed and connected with the explosion-proof lower shell 11. Specifically, the setting of the seal can isolate the connection between the explosion-proof upper shell 12 and the explosion-proof lower shell 11 from water vapor, etc., and when the lithium-ion battery module is working normally, water vapor is prevented from entering the interior of the explosion-proof shell 1 to affect the battery cell 5.

[0027] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A lithium-ion battery module, characterized in that: The invention comprises an explosion-proof shell, wherein the explosion-proof shell comprises an explosion-proof lower shell and an explosion-proof upper shell covering the explosion-proof lower shell, wherein a battery cell and a battery management system electrically connected to the battery cell are arranged in the explosion-proof shell, a fire extinguishing agent storage part is arranged flat above the battery cell, the fire extinguishing agent storage part can be broken when the temperature in the explosion-proof shell is greater than a first preset value, a fire extinguishing material is arranged in the fire extinguishing agent storage part so that the fire extinguishing material is sprayed toward the battery cell when the fire extinguishing agent storage part is broken, and a buzzer alarm is also arranged in the explosion-proof shell, the buzzer alarm is electrically connected to one end of a thermistor wire, and the other end of the thermistor wire is electrically connected to the battery management system so as to emit an alarm sound when the temperature in the explosion-proof shell is greater than a second preset value.

2. The lithium-ion battery module according to claim 1, characterized in that: The main body of the explosion-proof upper shell is one of steel plate, cast steel and cast iron, and a layer of ultra-high molecular weight polyethylene fiber material is also provided on the main surface of the explosion-proof upper shell; the main body of the explosion-proof lower shell is one of steel plate, cast steel and cast iron, and a layer of ultra-high molecular weight polyethylene fiber material is also provided on the main surface of the explosion-proof lower shell.

3. The lithium-ion battery module according to claim 1, characterized in that: The fire extinguishing agent is one of water, difluoromonochloromonobromomethane, carbon dioxide and dry powder fire extinguishing agent.

4. The lithium-ion battery module according to claim 1, characterized in that: The buzzer alarm is a power-off alarm, and the thermosensitive metal wire is a first thermosensitive metal wire. When the temperature in the explosion-proof housing reaches the second preset value, the first thermosensitive metal wire melts to cause the buzzer alarm to sound an alarm.

5. The lithium-ion battery module according to claim 1, characterized in that: The buzzer alarm is a power-on alarm, and the thermistor is a second thermistor. When the temperature in the explosion-proof housing is lower than the second preset value, the second thermistor has a large resistance so that the power-on alarm does not work. When the temperature in the explosion-proof housing reaches the second preset value, the resistance of the second thermistor decreases and the buzzer alarm sounds.

6. The lithium-ion battery module according to claim 1, characterized in that: The fire extinguishing agent storage unit and the buzzer alarm are fixed side by side on the inner surface of the explosion-proof upper shell.

7. The lithium-ion battery module according to claim 1, characterized in that: The fire extinguishing agent storage portion is made of a thermally decomposable material.

8. The lithium-ion battery module according to claim 1, characterized in that: A sealing member is provided between the explosion-proof upper shell and the explosion-proof lower shell so that the explosion-proof upper shell and the explosion-proof lower shell are sealed and connected.

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