阅读说明：本技术 锂电池箱火灾防控防爆阀 (Fire prevention and control explosion-proof valve of lithium battery box ) 是由 姚冰 王宜文 吕梦强 葛磊 卢军义 于 2019-10-18 设计创作，主要内容包括：本发明提供一种锂电池箱火灾防控防爆阀。锂电池箱火灾防控防爆阀,包括阀体组件和监测模块组件。所述阀体组件包括密封盖、第一O型密封圈、密封压螺、防水透气膜、第二O型密封圈、防爆阀壳体、插件。所述密封盖活动安装在所述防爆阀壳体上。所述第一O型密封圈与所述密封盖相接触,所述防水透气膜设于所述防爆阀壳体的一侧,所述密封压螺螺纹与所述防水透气膜相接触,所述第二O型密封圈设于所述防爆阀壳体上。所述监测模块组件包括电源管理单元、传感器单元、主控单元、通讯单元、启动单元,上述单元均设于PCB板上。本发明可实现锂电池箱热失控早期监测告警和快速响应防爆泄压联动,满足动力锂电池箱及UPS备用电源等设备的安全防控防爆要求。(The invention provides a fire prevention and control explosion-proof valve of a lithium battery box. Lithium cell case conflagration prevention and control explosion-proof valve includes valve body subassembly and monitoring module subassembly. The valve body assembly comprises a sealing cover, a first O-shaped sealing ring, a sealing pressing screw, a waterproof breathable film, a second O-shaped sealing ring, an explosion-proof valve shell and a plug-in. The sealing cover is movably arranged on the explosion-proof valve shell. The first O-shaped sealing ring is in contact with the sealing cover, the waterproof breathable film is arranged on one side of the explosion-proof valve shell, the sealing press screw thread is in contact with the waterproof breathable film, and the second O-shaped sealing ring is arranged on the explosion-proof valve shell. The monitoring module assembly comprises a power management unit, a sensor unit, a main control unit, a communication unit and a starting unit, and the units are all arranged on the PCB. The invention can realize the linkage of early monitoring and alarming of thermal runaway of the lithium battery box and quick response explosion-proof pressure relief, and meets the requirements of safety, control and explosion-proof of equipment such as a power lithium battery box, a UPS (uninterrupted power supply) and the like.)

1. The utility model provides an explosion-proof valve of lithium cell case conflagration prevention and control which characterized in that includes:

the valve body assembly comprises a sealing cover, a first O-shaped sealing ring, a sealing pressing screw, a waterproof breathable film, a second O-shaped sealing ring, an explosion-proof valve shell and an insert, wherein the sealing cover is movably arranged on the explosion-proof valve shell, the first O-shaped sealing ring is arranged on the explosion-proof valve shell and is contacted with the sealing cover, the waterproof breathable film is arranged on one side of the explosion-proof valve shell, the sealing pressing screw is arranged on one side of the explosion-proof valve shell in a threaded manner and is contacted with the waterproof breathable film, the second O-shaped sealing ring is arranged on the explosion-proof valve shell, and the insert is arranged on one side, away from the sealing pressing screw, of the explosion-proof valve shell;

the gas actuator assembly is arranged in the explosion-proof valve shell;

and the monitoring module assembly is arranged in the explosion-proof valve shell.

2. The lithium battery box fire prevention and control explosion-proof valve as recited in claim 1, wherein the gas actuator assembly is provided in the explosion-proof valve housing, the gas actuator comprises an actuator shell, a gas generator, a push rod, a compression spring, an actuator pressing screw, a third O-shaped sealing ring and a C-shaped spring, the actuator shell is arranged in the explosion-proof valve shell, the push rod is arranged in the actuator shell, the gas generator is arranged in the push rod, the compression spring is arranged in the actuator shell, the compression spring is arranged on the actuator shell and sleeved outside the push rod, the actuator is arranged in the push rod through a pressing screw thread, the gas generator penetrates through the actuator pressing screw, the third O-shaped sealing ring is sleeved on the push rod and is in contact with the inner wall of the actuator shell, and the C-shaped spring is sleeved on the push rod.

3. The lithium battery box fire prevention and control explosion-proof valve as recited in claim 2, wherein the gas generator is assembled inside the push rod and fastened by using a sealing silica gel, and the actuator housing is connected with the explosion-proof valve housing through a thread.

4. The lithium battery box fire prevention and control explosion-proof valve according to claim 1, wherein the monitoring module assembly comprises a PCB board, a power management unit, a sensor unit, a main control unit, a communication unit, a starting unit and a wire harness, the PCB board is arranged in the explosion-proof valve shell, the power management unit, the sensor unit, the main control unit, the communication unit and the starting unit are all arranged on the PCB board, and the main control unit comprises an arithmetic chip and a memory chip.

5. The lithium battery box fire prevention and control explosion prevention valve according to claim 4, wherein the sensor unit comprises a pressure sensor, a CO sensor, a temperature sensor, a VOC sensor.

6. The lithium battery box fire prevention and control explosion-proof valve as recited in claim 1, wherein when it is monitored that the air pressure or the gas concentration exceeds a certain threshold, the monitoring module assembly is configured to open the pressure release valve in advance through the starting unit.

7. The lithium battery box fire prevention and control explosion-proof valve according to claim 4, wherein the communication unit is used for communicating with a BMS in the battery box so as to realize sensor monitoring data sharing of the BMS and the explosion-proof valve monitoring module.

8. The lithium battery box fire prevention and control explosion prevention valve according to claim 4, wherein the communication unit transmits sensor information or alarm information to a rear platform through a BMS or directly through a CAN communication line.

Technical Field

The invention relates to the technical field of new energy safety, in particular to a fire prevention and control explosion-proof valve of a lithium battery box.

Background

Lithium cell case especially is used for pure electric vehicles's power battery case all has sealed requirement, generally requires protection level not less than IP67, and lithium ion electric core, because technological defect and misuse can appear the thermal runaway phenomenon, electric core cathode material can produce a large amount of combustible gas during the thermal runaway, causes the battery case to tear or explode, and a large amount of oxygen participates in the burning and can lead to the thermal runaway diffusion aggravation to cause and form large tracts of land conflagration and be difficult to restrain, and the harmfulness is very big. Therefore, early inhibition, monitoring, prevention and control and explosion prevention of thermal runaway of the lithium ion battery cell are very important. The general method for preventing and controlling fire of the lithium battery box at home and abroad is to add a temperature or CO monitoring module, judge the operation safety of the battery by monitoring and comparing the temperature or CO, and have insufficient accuracy and timeliness. For explosion protection, a mechanical pressure relief valve or a blast valve is adopted, and the main defects are that: the former has small pressure relief flow rate, which does not meet the requirement of explosion prevention and large flow rate, and the latter has large error of a prestress shearing explosion point, which is generally about 7-15Kpa, and can not meet the requirement of timely and accurate. The integrated prevention and control explosion-proof device which adopts the accurate measurement of gas expansion pressure and CO concentration as prevention and control points, discriminates thermal runaway information and links the quick action pressure relief of a generator does not exist, the operation safety of a lithium battery is related to personal and property safety, and the industry urgently needs an prevention and control explosion-proof device which can accurately and timely alarm the linkage pressure relief.

Therefore, it is necessary to provide a fire prevention and control explosion-proof valve for a lithium battery box to solve the above technical problems.

Disclosure of Invention

The invention aims to solve the technical problem of providing a fire prevention and control explosion-proof valve for a lithium battery box, which can realize early thermal runaway monitoring and alarming of the lithium battery box and quick response explosion prevention and pressure relief linkage and meet the safety prevention and control explosion prevention requirements of equipment such as a power lithium battery box and a UPS (uninterrupted power supply) standby power supply with an IP67 protection level.

In order to solve the technical problem, the invention provides a fire prevention and control explosion-proof valve for a lithium battery box, which comprises: the valve body assembly comprises a sealing cover, a first O-shaped sealing ring, a sealing pressing screw, a waterproof breathable film, a second O-shaped sealing ring, an explosion-proof valve shell and an insert, wherein the sealing cover is movably arranged on the explosion-proof valve shell, the first O-shaped sealing ring is arranged on the explosion-proof valve shell and is contacted with the sealing cover, the waterproof breathable film is arranged on one side of the explosion-proof valve shell, the sealing pressing screw is arranged on one side of the explosion-proof valve shell in a threaded manner and is contacted with the waterproof breathable film, the second O-shaped sealing ring is arranged on the explosion-proof valve shell, and the insert is arranged on one side, away from the sealing pressing screw, of the explosion-proof valve shell; the gas actuator assembly is arranged in the explosion-proof valve shell; and the monitoring module assembly is arranged in the explosion-proof valve shell.

Preferably, the gas actuator subassembly is located in the explosion-proof valve casing, the gas actuator includes that actuator casing, gas generator, push rod, compression spring, actuator press spiral shell, third O type sealing washer, C shape spring, the actuator casing is located in the explosion-proof valve casing, the push rod is located in the actuator casing, gas generator installs in the push rod, compression spring locates in the actuator casing, compression spring locates actuator casing and cover and establishes the push rod is outside, the actuator is pressed the spiral thread and is installed in the push rod, gas generator runs through the spiral shell is pressed to the actuator, third O type sealing washer cover is established on the push rod and with the inner wall of actuator casing contacts, C shape spring overlaps and establishes on the push rod.

Preferably, the gas generator is assembled inside the push rod and fastened by adopting sealing silica gel, and the actuator shell is connected with the explosion-proof valve shell through threads.

Preferably, the monitoring module assembly comprises a PCB, a power management unit, a sensor unit, a main control unit, a communication unit, a starting unit and a wire harness, wherein the PCB is arranged in the explosion-proof valve shell, the power management unit, the sensor unit, the main control unit, the communication unit and the starting unit are arranged on the PCB, and the main control unit comprises an operation chip and a storage chip.

Preferably, the sensor unit comprises a pressure sensor, a CO sensor, a temperature sensor, a VOC sensor.

Preferably, when the monitored gas pressure or the monitored gas concentration exceeds a certain threshold, the monitoring module assembly is used for opening the pressure relief valve in advance through the starting unit.

Preferably, the communication unit is used for communicating with a BMS in the battery box so as to realize the sharing of sensor monitoring data of the BMS and the monitoring module of the explosion-proof valve.

Preferably, the communication unit transmits the sensor information or the alarm information to the rear platform through the BMS or directly through the CAN communication line.

Compared with the related art, the fire prevention and control explosion-proof valve for the lithium battery box has the following beneficial effects:

the invention provides a fire prevention and control explosion-proof valve for a lithium battery box, which can realize early monitoring and alarming of thermal runaway of the lithium battery box and quick response explosion prevention and pressure relief linkage, and meet the safety prevention, control and explosion prevention requirements of equipment such as a power lithium battery box and a UPS (uninterrupted power supply) standby power supply with an IP67 protection grade.

Drawings

FIG. 1 is a schematic cross-sectional structural view of a fire prevention and control explosion-proof valve of a lithium battery box provided by the invention;

FIG. 2 is a schematic structural diagram of a lithium battery box fire prevention and control explosion-proof valve in a top view, provided by the invention;

FIG. 3 is a schematic structural diagram of a valve body assembly of a fire prevention and control explosion-proof valve of a lithium battery box provided by the invention;

FIG. 4 is a schematic structural diagram of a gas actuator assembly of the fire prevention and control explosion-proof valve of the lithium battery box provided by the invention;

FIG. 5 is a distribution diagram of a lithium battery box fire prevention and control explosion-proof valve monitoring module assembly provided by the invention;

FIG. 6 is a schematic diagram of a normal structure of a fire prevention and control explosion-proof valve of a lithium battery box provided by the invention;

FIG. 7 is a schematic view of a half-opening mechanism of a fire prevention and control explosion-proof valve of a lithium battery box provided by the invention;

FIG. 8 is a schematic view of a fully-opened structure of a fire prevention and control explosion-proof valve of a lithium battery box provided by the invention;

fig. 9 is a schematic working diagram of a lithium battery box fire prevention and control explosion-proof valve detection assembly provided by the invention.

Reference numbers in the figures: 1. the sealing cover comprises a sealing cover, 2, a first O-shaped sealing ring, 3, a PCB (printed Circuit Board), 4, a sealing pressing screw, 5, a waterproof and breathable film, 6, a second O-shaped sealing ring, 7, an explosion-proof valve shell, 8, an actuator shell, 9, an insertion piece, 10, a gas generator, 11, a push rod, 12, a compression spring, 13, an actuator pressing screw, 14, a third O-shaped sealing ring, 15, a pressure sensor, 16, a CO sensor, 17, a temperature sensor, 18, an operation chip, 19, a wiring harness, 20 and a C-shaped spring.

Detailed Description

The invention is further described with reference to the following figures and embodiments.

Referring to fig. 1-5, in the present invention, the fire prevention and control explosion-proof valve for a lithium battery box includes: the valve body assembly comprises a sealing cover 1, a first O-shaped sealing ring 2, a sealing pressing screw 4, a waterproof breathable membrane 5, a second O-shaped sealing ring 6, an explosion-proof valve shell 7 and an insertion piece 9, wherein the sealing cover 1 is movably arranged on the explosion-proof valve shell 7, the first O-shaped sealing ring 2 is arranged on the explosion-proof valve shell 7 and is in contact with the sealing cover 1, the waterproof breathable membrane 5 is arranged on one side of the explosion-proof valve shell 7, the sealing pressing screw 4 is arranged on one side of the explosion-proof valve shell 7 in a threaded manner and is in contact with the waterproof breathable membrane 5, the second O-shaped sealing ring 6 is arranged on the explosion-proof valve shell 7, and the insertion piece 9 is arranged on one side, far away from the sealing pressing screw 4, of the; a gas actuator assembly disposed within the explosion-proof valve housing 7; and the monitoring module assembly is arranged in the explosion-proof valve shell 7.

The gas actuator assembly is arranged in the explosion-proof valve shell 7, the gas actuator comprises an actuator shell 8, a gas generator 10, a push rod 11, a compression spring 12, an actuator pressing screw 13, a third O-shaped sealing ring 14 and a C-shaped spring 20, the actuator shell 8 is arranged in the explosion-proof valve shell 7, the push rod 11 is arranged in the actuator shell 8, the gas generator 10 is installed in the push rod 11, the compression spring is arranged in the actuator housing 8, the compression spring 12 is arranged on the actuator shell 8 and sleeved outside the push rod 11, the actuator pressing screw 13 is installed in the push rod 11 in a threaded manner, the gas generator 10 penetrates through the actuator pressing screw 13, the third O-shaped sealing ring 14 is sleeved on the push rod 11 and is in contact with the inner wall of the actuator shell 8, and the C-shaped spring 20 is sleeved on the push rod 11.

The gas generator 10 is assembled inside the push rod 11 and fastened by adopting sealing silica gel, and the actuator shell 8 is connected with the explosion-proof valve shell 7 through threads.

The device is connected with a component needing pressure relief, the internal and external pressure intensities of the device are adjusted through a waterproof breathable film 5, and a sealing pressure screw 4 is used for fastening the waterproof breathable film 5; the explosion-proof valve shell 7 and the push rod 11 are connected by the compression spring 12 in the actuator shell 8, when the internal pressure value is larger than 5Kpa, the internal pressure pushes the sealing cover 1, the sealing cover 1 drives the push rod 11, the compression spring 12 is pushed to continue to compress, and the sealing cover 1 and the explosion-proof valve shell 7 are separated to reduce pressure.

The monitoring module assembly comprises a PCB (printed circuit board) 3, a power management unit, a sensor unit, a main control unit, a communication unit, a starting unit and a wiring harness 19, wherein the PCB 3 is arranged in the explosion-proof valve shell 7, the power management unit, the sensor unit, the main control unit, the communication unit and the starting unit are arranged on the PCB 3, and the main control unit comprises an operation chip 18 and a storage chip.

The sensor unit comprises a pressure sensor 15, a CO sensor 16, a temperature sensor 17 and a VOC sensor;

when the pressure sensor 15, the CO sensor 16 and the temperature sensor 17 detect that two items of pressure, CO content and temperature in the valve body 7 exceed threshold values, starting signals are sent to the gas generator 10 through signal lines under the condition of danger triggering so that other generators can automatically work, a large amount of gas is generated in the actuator shell 8, the push rod 11 is rapidly pushed outwards, the sealing cover 1 is completely opened, pressure is rapidly reduced, exhaust is rapidly achieved, and danger is prevented;

when the monitoring module assembly monitors that the air pressure or the gas concentration exceeds a certain threshold value, the starting unit opens the pressure release valve in advance, so that the tearing of the battery box caused by too large gas quantity released by battery thermal runaway and delayed release is avoided, the time point is earlier than the opening time of the common pressure release valve, the integrity and the sealing property of the battery box body are facilitated, and the effectiveness of the subsequent fire suppression work is also facilitated to be improved;

the communication unit CAN communicate with a BMS in the battery box, sensor monitoring data sharing of the BMS and the monitoring module of the anti-explosion valve is achieved, and sensor information or alarm information CAN be sent to the rear platform through the BMS or directly through a CAN communication line.

Referring to fig. 6, the waterproof breathable film 5 and the sealing pressure screw 4 form a breather valve, and when the pressure in the tank is less than 5KPa under the normal state of the device, the breathable amount of the waterproof breathable film 5 is less than or equal to 2L/min to maintain the pressure in the tank;

referring to fig. 7, when the internal pressure of the case is 5Kpa to 15Kpa, the explosion-proof valve is in a semi-open state, and the internal pressure is released through the pressure spring and the breather valve in the explosion-proof valve, so that the air permeability is 50L/min to 150L/min;

referring to fig. 8, when the CO value in the tank exceeds 140PPM, the pressure value exceeds 15KPa, and the temperature value exceeds 65 ℃, any two combination conditions are met, a start signal is triggered, the gas generator device responds instantly, the prevention and control explosion-proof valve is fully opened, and the air permeability reaches more than 2500L/min;

referring to fig. 9, the PCB 3 is provided with a power management unit, an internal pressure monitoring unit, a temperature monitoring unit, a carbon monoxide monitoring unit, a main control unit, a communication unit, and a start unit, wherein the power management unit can convert an external input power to provide a required power for each unit in the system; the internal pressure monitoring unit, the temperature monitoring unit and the carbon monoxide monitoring unit monitor the air pressure and the temperature of the environment in the battery box and the change condition of carbon monoxide in real time and transmit the parameter information to the main control unit; the main control unit obtains the current working state through a multi-parameter composite judgment algorithm according to the collected parameter information of each sensor, and can complete related actions under each alarm level according to a set program; the communication unit is responsible for data exchange with the outside and can be used as an online upgrading port; the starting unit provides a starting signal to drive the gas actuator assembly to work.

The fire prevention and control explosion-proof valve for the lithium battery box provided by the invention has the following working principles: under the normal operating mode: the working temperature of the battery box is-40-65 ℃, the fluctuation range of the air pressure is-15 kpa, the positive pressure is adjusted by the waterproof breathable film 5, the negative pressure is adjusted by the breathing valve, and the sealing state is recovered after the internal pressure and the external pressure are balanced;

under the abnormal working condition: due to the thermal runaway of the battery core or the fire of the circuit in the battery box, a large amount of CO can be released₂、H₂CO and VOC gas, and increase along with the internal pressure that rises of temperature rise, at first, through waterproof ventilated membrane 5 exhaust, the sensor can catch CO rapidly this moment, the change value of pressure and temperature, when the CO value exceeds 140PPM, the pressure value exceeds 15kpa, when the temperature value exceeds 65 ℃, arbitrary two liang of combination condition satisfies, then start gas generator 10 and open the relief valve, the displacement reaches more than 2500L/min this moment, the linkage uploads to the driver's cabin simultaneously and starts conflagration suppression device, reach the explosion-proof requirement of prevention and control.

Compared with the related art, the fire prevention and control explosion-proof valve for the lithium battery box has the following beneficial effects:

the device can realize the linkage of early thermal runaway monitoring and warning and quick response explosion-proof pressure relief of the lithium battery box, and meet the safety, prevention and control explosion-proof requirements of equipment such as the power lithium battery box with IP67 protection level, a UPS (uninterrupted power supply) and the like.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.