A safety alarm and protection device for power batteries

Abstract

The present invention relates to a safety alarm protection device for power batteries, which includes a power battery and a double-layer housing arranged around the lower periphery of the power battery. A first pressure sensor is provided in the upper part of the outer shell of the power battery. The cavities of the double-layer housing at the lower part of the power battery are respectively connected to a radiator and a water pump through pipelines. The water pump and the radiator are both connected to a water storage tank. A temperature sensor is provided inside the cavity of the double-layer housing, and a second pressure sensor is provided at the lower part. A water level sensor is provided in the water storage tank. The temperature sensor, the pressure sensor, and the water level sensor are connected to the input end of a multi-channel temperature controller, and the output end of the multi-channel temperature controller is connected to an alarm. The safety alarm protection device for power batteries of the present invention monitors and alarms against leakage of the power battery, controls the high temperature of the power battery, timely controls and adjusts the temperature, and maximizes the efficiency of the power battery during operation.

Description

Technical Field

[0001] The present invention relates to the field of battery protection, and particularly to a safety alarm and protection device for power batteries. Background Art

[0002] With the increasing popularity of electric vehicles, as an important component thereof, the safety of power batteries is particularly important. Power batteries are extremely sensitive to moisture in the air. Once the outer shell is damaged, in rainy, snowy or other weather conditions, or when the vehicle passes through a waterlogged section, the accumulated water will enter the interior of the battery pack through the damaged part, causing the battery to short-circuit and damage the power battery. Excessive moisture content in the air will be absorbed by the battery, resulting in problems such as battery swelling and liquid leakage. In addition, different ambient temperatures around the battery will affect the safety, life, function and performance of the power battery. Whether the temperature is too high or too low, the power battery may have problems such as thermal runaway, serious attenuation of life, and charge and discharge limitations.

[0003] Currently, for the problem of excessive temperature of power batteries, automobile manufacturers only monitor the temperature difference, alarm when safety abnormalities are found, and then conduct fault troubleshooting. If the temperature is too high and not processed in time, serious safety problems will occur. When there is a leakage problem in the battery pack, it is only discovered through later maintenance and then inspected and processed. When the power battery of the vehicle catches fire, it is impossible to quickly extinguish the fire inside the battery pack in a short time, resulting in property and personnel losses. Summary of the Invention

[0004] In view of the above situation, the object of the present invention is to provide a safety alarm and protection device for power batteries, which monitors and alarms against battery leakage, controls the high temperature of the power battery, timely controls and adjusts the temperature, and maximizes the efficiency of the power battery.

[0005] The technical solution of the present invention is as follows: A safety alarm and protection device for power batteries, comprising a power battery and a double-layer housing arranged around the lower periphery of the power battery. A pressure relief valve is installed on the outer shell of the power battery, and a first pressure sensor is arranged in the upper part of the outer shell.

[0006] The outer shell of the upper part of the power battery is connected to a pipeline, which is sequentially connected to an air booster pump, a carbon dioxide fire extinguishing tank, and an air filter. The carbon dioxide fire extinguishing tank is connected in parallel with an intake pipeline. A first solenoid valve is installed on the pipeline between the booster pump and the carbon dioxide fire extinguishing tank, and a second solenoid valve is installed on the intake pipeline.

[0007] The double-layered housing cavities at the lower part of the power battery are respectively connected to a radiator and a water pump through pipelines. A third solenoid valve and a fourth solenoid valve are respectively installed on the pipelines connecting the double-layered housing to the radiator and the vacuum pump. The vacuum pump is connected between the fourth solenoid valve and the water pump. Both the water pump and the radiator are connected to a water storage tank. A connecting pipeline is connected between the pipeline between the radiator and the double-layered housing and the output pipeline of the booster pump. A fifth solenoid valve is provided on the connecting pipeline. A temperature sensor is provided inside the double-layered housing cavity, and a second pressure sensor is provided at the lower part. A water level sensor is provided inside the water storage tank;

[0008] Solenoid valves are provided on the vacuum pump, the water pump, the carbon dioxide fire extinguishing tank, the air booster pump, the air filter, the radiator and the water storage tank. The temperature sensor, the pressure sensor and the water level sensor are connected to the input end of a multi-channel temperature controller, and the output end of the multi-channel temperature controller is connected to an alarm.

[0009] Preferably, the double-layered housing is formed by pressurizing a metal material. The gap between the outer layer and the inner layer is 5 mm, and the periphery is sealed with a gasket. The outer layer and the inner layer are fixed by bolts, which is convenient for later maintenance and installation.

[0010] Preferably, the double-layered housing includes a closed housing. A number of inner circulation partition plates are arranged at intervals inside the double-layered housing. There is a gap between one end of the inner circulation partition plate and the housing, and the connection ends are arranged staggeredly. Cavity support plastic balls are arranged in the interval gaps of the inner circulation partition plates. The cavity support plastic balls are sequentially connected into a row through plastic rods, and several rows are arranged at intervals in the interval gaps of the inner circulation partition plates. The gap between the cavity support plastic balls and the inner circulation partition plate forms a cavity.

[0011] Preferably, there are 3 inner circulation partition plates, and two rows of cavity support plastic balls are arranged between adjacent circulation partition plates, and the circulation effect is good.

[0012] For the power battery safety alarm and protection device of the present invention, in summer when the temperature of the power battery is too high, the temperature sensor monitors that the temperature inside the power battery is too high, and the signal is transmitted to the multi-channel temperature controller. The multi-channel temperature controller analyzes and processes the signal data and makes a reaction, controlling the water pump, the third and fourth solenoid valves to open. The water pump starts, and the cooling water circulates through the gap inside the double-layered housing to the water in the water storage tank and then returns to the double-layered housing gap after being cooled by the radiator, playing a role in cooling and heat dissipation, keeping the power battery in a good working environment, safe and energy-saving.

[0013] When the battery temperature is too low in winter, the temperature sensor monitors that the temperature inside the power battery is too low, and the signal is transmitted to the multi-channel temperature controller. The multi-channel temperature controller analyzes and processes the data and reacts, controlling the third solenoid valve to close, opening the fourth solenoid valve and the water pump solenoid valve, starting the water pump, and the cooling water enters the water storage tank from the double-layer housing. The air booster pump is turned on, the fifth solenoid valve is opened, and the pressurized gas enters the double-layer housing. When the water level sensor monitors that the water level reaches the upper water level, the water pump is turned off, the multi-channel temperature controller controls the fifth solenoid valve to close, and the vacuum pump is turned on. When the second pressure sensor monitors that the cavity of the double-layer housing reaches a negative pressure state, the multi-channel temperature controller sends a signal to control the water pump solenoid valve and the fourth solenoid valve to close, and the vacuum pump is turned off. The cavity of the double-layer housing is in a vacuum state to achieve the purpose of preserving the internal temperature of the power battery and reducing temperature loss and power consumption.

[0014] In the power battery safety alarm and protection device of the present invention, under normal circumstances, the double-layer housing around the power battery is pressurized so that the double-layer housing has a certain pressure, creating a pressure difference between the battery and the outside world. When there is a leak in the power battery, the pressure difference changes, and the data collected by the first pressure sensor is transmitted to the multi-channel temperature controller. The multi-channel temperature controller sends a signal to the alarm to notify the driver that there is a leak in the power battery and take measures, and at the same time turns on the air booster pump to pressurize the inside of the power battery to prevent external substances from entering the inside of the power battery to protect the battery.

[0015] The power battery safety alarm and protection device of the present invention can monitor the leak of the power battery and take measures to protect it. At the same time, it monitors the temperature of the power battery pack and adopts corresponding means to process according to the temperature level to protect the battery, ensuring safety and energy conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is a schematic diagram of the internal structure of the double-layer housing of the present invention;

[0018] Figure 3 is a specific implementation cross-sectional view of the present invention;

[0019] In the figure: 1 - power battery; 2 - double-layer housing; 21 - internal circulation partition; 22 - cavity support plastic ball; 23 - plastic rod; 3 - pressure relief valve; 4 - first pressure sensor; 5 - intake pipe; 6 - first solenoid valve; 7 - second solenoid valve; 8 - third solenoid valve; 9 - fourth solenoid valve; 10 - connecting pipe; 11 - fifth solenoid valve; 12 - temperature sensor; 13 - second pressure sensor; 14 - water level sensor; 15 - outer shell. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The battery safety alarm and protection device of the present invention will be further described in detail below in conjunction with the accompanying drawings. The specific content is as follows:

[0021] A power battery safety alarm and protection device includes a power battery 1 and a double-layer housing 2 arranged around the lower periphery of the power battery 1. A pressure relief valve 3 is installed on the outer shell 15 of the power battery 1, and a first pressure sensor 4 is provided in the upper part inside the outer shell 15.

[0022] The outer shell 15 at the upper part of the power battery 1 is connected to a pipeline, which is successively connected to an air booster pump, a carbon dioxide fire extinguishing tank, and an air filter. The carbon dioxide fire extinguishing tank is connected with an intake pipeline 5 in parallel. A first solenoid valve 6 is installed on the pipeline between the booster pump and the carbon dioxide fire extinguishing tank, and a second solenoid valve 7 is installed on the intake pipeline 5.

[0023] The cavities of the double-layer housing at the lower part of the power battery 1 are respectively connected to a radiator and a water pump through pipelines. A third solenoid valve 8 and a fourth solenoid valve 9 are respectively installed on the pipelines connecting the double-layer housing 2 with the radiator and the vacuum pump. The vacuum pump is connected between the fourth solenoid valve and the water pump. Both the water pump and the radiator are connected to a water storage tank. A connecting pipeline 10 is connected between the pipeline between the radiator and the double-layer housing and the output pipeline of the booster pump. A fifth solenoid valve 11 is provided on the connecting pipeline 10. A temperature sensor 12 is provided inside the cavity of the double-layer housing 1, and a second pressure sensor 13 is provided at the lower part. A water level sensor 14 is provided in the water storage tank.

[0024] Solenoid valves are provided on the vacuum pump, the water pump, the carbon dioxide fire extinguishing tank, the air booster pump, the air filter, the radiator, and the water storage tank. The temperature sensor, the pressure sensor, and the water level sensor are connected to the input end of a multi-channel temperature controller, and the output end of the multi-channel temperature controller is connected to an alarm.

[0025] A number of inner circulation partitions 21 are arranged at intervals inside the double-layer housing 2. There is a gap between one end of the inner circulation partition 21 and the housing, and the connection ends are arranged staggeredly. Cavity support plastic balls 22 are arranged in the intervals of the inner circulation partition 21. The cavity support plastic balls 22 are connected in sequence into a row through plastic rods 23. A number of rows are arranged at intervals in the intervals of the inner circulation partition 21. The gaps between the cavity support plastic balls 22 and the inner circulation partition 21 form cavities. When there is negative pressure in the cavities, the cavity circular plastic support balls 22 play a role in supporting the inner and outer shells from deformation. When there is antifreeze in the cavities, the inner circulation partition 21 makes the antifreeze circulate evenly to dissipate heat from the battery pack evenly.

[0026] Furthermore, in this embodiment, there are 3 inner circulation partitions 21, and there are two rows of cavity support plastic balls 22 between adjacent circulation partitions 21, and the circulation effect is good.

[0027] Further, the double-layer housing 2 is formed by pressurizing aluminum alloy. The gap between the outer layer and the inner layer is 5 mm, and there is a gasket for sealing around. The outer layer and the inner layer are fixed by bolts, with good heat dissipation effect and easy water flow.

[0028] During specific implementation, in summer when the temperature of the power battery is too high, the temperature sensor 12 monitors that the temperature inside the power battery 1 is too high, and the signal is transmitted to the multi-channel temperature controller. The multi-channel temperature controller analyzes and processes the signal data and makes a reaction to control the opening of the water pump, the third solenoid valve 8 and the fourth solenoid valve 9. The water pump starts, and the cooling water circulates through the gap inside the double-layer housing 2 and reaches the water in the water storage tank. Then, after passing through the radiator for heat dissipation, it returns to the gap of the double-layer housing 2, playing a role in cooling and heat dissipation, keeping the power battery in a good working environment, safe and energy-saving.

[0029] In winter when the battery temperature is too low, the temperature sensor 12 monitors that the temperature inside the power battery 1 is too low, and the signal is transmitted to the multi-channel temperature controller. The multi-channel temperature controller analyzes and processes the data and makes a reaction to control the closing of the third solenoid valve 8, open the fourth solenoid valve 9 and the water pump solenoid valve. The water pump is turned on, and the cooling water enters the water storage tank from the double-layer housing 1. The air booster pump is turned on, and the fifth solenoid valve 11 is opened, and the pressurized gas enters the double-layer housing 1. When the water level sensor 14 monitors that the water level reaches the upper water level, the water pump is turned off. The multi-channel temperature controller controls the closing of the fifth solenoid valve 11, and the vacuum pump is turned on. When the second pressure sensor 13 monitors that the cavity of the double-layer housing 2 reaches the negative pressure state, the multi-channel temperature controller sends a signal to control the closing of the water pump solenoid valve and the fourth solenoid valve 9, and the vacuum pump is turned off. The cavity of the double-layer housing 2 is in a vacuum state to achieve the purpose of preserving the internal temperature of the power battery 1 and reducing the temperature loss and power consumption.

[0030] Leak prevention in summer: When there is a leak at the lower part of the power battery 1 due to collision, the water level of the coolant in the water storage tank drops to the minimum. The water level sensor 14 transmits a signal to the multi-channel temperature controller. When the multi-channel temperature controller receives the signal, the alarm goes off, informing the driver that there is a leak in the battery compartment. The internal pressure of the power battery 1 suddenly drops, and the first pressure sensor 4 sends a signal to the multi-channel temperature controller. At the same time, the multi-channel temperature controller opens the first solenoid valve 6 and the air booster pump connected to the upper part of the power battery 1. The air passes through the air filter, the second solenoid valve 7, and the air booster pump and enters the inside of the power battery 1 to pressurize the inside of the power battery 1 to prevent foreign objects from entering the power battery and causing a short circuit.

[0031] Leak prevention in winter: When there is a leak in the power battery 1 due to collision, the pressure of the first pressure sensor 4 suddenly increases, and the internal pressure of the power battery 1 suddenly drops. The first pressure sensor 4 transmits a signal to the multi-channel temperature controller. The multi-channel temperature controller controls the alarm to go off, informing the driver that there is a leak in the battery compartment. At the same time, it controls the air booster pump to turn on to pressurize the inside of the power battery to prevent foreign objects from entering the power battery and causing a short circuit. When the pressure inside the battery 1 exceeds the rated pressure, the pressure relief valve 3 releases the pressure.

[0032] When the battery explodes, the temperature sensor 10 detects high temperature and the first pressure sensor 11 detects high pressure, and at the same time sends signals to the multi-channel temperature controller. When the multi-channel temperature controller receives signals of high temperature and high pressure at the same time or the temperature reaches a certain upper limit, the multi-channel temperature controller sends signals to control the alarm to sound, informing the driver that there is a fire inside the battery compartment. At the same time, the multi-channel controller sends signals to open the first solenoid valve 4 and start the booster pump. Air passes through the air filter, carbon dioxide fire extinguishing tank and air booster pump, and the pressurized air with fire extinguishing agent reaches inside the outer shell 15 of the power battery 1 to quickly isolate oxygen, and the driver and passengers quickly get off the vehicle and leave the fire source.

Claims

1. A power battery safety alarm protection device, comprising a power battery and a double-layer housing disposed around the lower periphery of the power battery, wherein the housing of the power battery is provided with a pressure relief valve, and a first pressure sensor is disposed in the upper inner portion of the housing; The housing on the upper portion of the power battery is connected to a pipe, which is sequentially connected to an air booster pump, a carbon dioxide fire extinguisher tank, and an air filter. The carbon dioxide fire extinguisher tank is also connected to an air intake pipe. A first solenoid valve is installed on the pipe between the booster pump and the carbon dioxide fire extinguisher tank, and a second solenoid valve is installed on the air intake pipe. The double-layer shell cavity at the bottom of the power battery is connected to a radiator and a water pump through pipes. A third solenoid valve and a fourth solenoid valve are installed on the pipes connecting the double-layer shell to the radiator and the vacuum pump, respectively. The vacuum pump is connected between the fourth solenoid valve and the water pump. The water pump and the radiator are both connected to a water tank. A connecting pipe is connected between the pipe between the radiator and the double-layer shell and the boost pump output pipe. A fifth solenoid valve is installed on the connecting pipe. A temperature sensor is provided inside the double-layer shell cavity, a second pressure sensor is provided at the bottom, and a water level sensor is provided in the water tank. The vacuum pump, water pump, carbon dioxide fire extinguisher, air booster pump, air filter, radiator and water tank are all provided with solenoid valves. The temperature sensor, pressure sensor and water level sensor are connected to the input end of the multi-way thermostat, and the output end of the multi-way thermostat is connected to the alarm. When the power battery temperature is too high, the temperature sensor detects that the temperature inside the power battery is too high and transmits the signal to the multi-channel thermostat. The multi-channel thermostat analyzes and processes the signal data and responds by controlling the water pump, opening the third and fourth solenoid valves, and starting the water pump. The cooling water circulates through the gap in the double-layer shell to the water storage tank, and then returns to the gap in the double-layer shell after dissipating heat through the radiator, thereby achieving the purpose of cooling and dissipating heat. When the battery temperature is too low, the temperature sensor detects that the temperature inside the power battery is too low, and the signal is transmitted to the multi-channel temperature controller. The multi-channel temperature controller analyzes and processes the data and responds to it, controlling the third solenoid valve to close and opening the fourth solenoid valve and the water pump solenoid valve. The water pump is turned on, and cooling water enters the water tank from the double-layer shell. The air booster pump is turned on, the fifth solenoid valve is opened, and the pressurized gas enters the double-layer shell. When the water level sensor detects that the water level reaches the upper water level, the water pump is turned off, the multi-way thermostat controls the fifth solenoid valve to close, and the vacuum pump is turned on. When the second pressure sensor detects that the double-layer shell cavity reaches a negative pressure state, the multi-way thermostat sends a signal to control the water pump solenoid valve and the fourth solenoid valve to close, and the vacuum pump is turned off. The double-layer shell cavity is in a vacuum state to maintain the vacuum. The purpose of storing the internal temperature of the power battery and reducing the temperature loss of electrical energy; Under normal circumstances, the double-layer shell around the power battery is pressurized to create a certain pressure, creating a pressure difference between the battery and the outside world. When a leak occurs in the power battery, the pressure difference changes, and the data collected by the first pressure sensor is transmitted to the multi-channel temperature controller. The multi-channel temperature controller sends a signal to the alarm to notify the driver of the leak in the power battery and to take action. At the same time, the air booster pump is turned on to pressurize the inside of the power battery to prevent foreign substances from entering the power battery and protect the battery.

2. The power battery safety alarm protection device according to claim 1, characterized in that The double-layer shell is made of pressurized metal material, the gap between the outer layer and the inner layer is 5mm, and the periphery is sealed with a sealing gasket. The outer layer and the inner layer are fixed by bolts to facilitate later maintenance and installation.

3. The power battery safety alarm protection device according to claim 1, characterized in that The double-layer shell includes a sealed shell, and a plurality of internal circulation partitions are arranged at intervals inside the double-layer shell. A gap is provided between one end of the internal circulation partition and the shell, and the connecting ends are staggered. The intervals between the internal circulation partitions are arranged with cavity-supporting plastic balls, and the cavity-supporting plastic balls are connected in sequence into a row through plastic rods. Several rows are arranged at intervals in the intervals between the internal circulation partitions, and the gaps between the cavity-supporting plastic balls and the internal circulation partitions form a cavity.

4. The power battery safety alarm protection device according to claim 3 is characterized in that There are three inner circulation partitions, and two rows of cavities are provided between adjacent circulation partitions to support plastic balls, so the circulation effect is good.

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