System for exchanging heat with power battery

Abstract

The utility model discloses a system of heat exchange with power battery, including battery box, three-way valve, intake pipe, exhaust pipe, blower and heat exchange mechanism, inside the battery box is equipped with temperature sensor, battery box is communicated with one way of three-way valve, the other two way of three-way valve is respectively communicated with intake pipe and exhaust pipe, and the heat exchange mechanism is equipped with air blower. The air inlet pipe is communicated with an air valve and an air filter, an air inlet of the air blower is communicated with the air inlet pipe, the heat exchange mechanism comprises a working box, a heater and an evaporator are arranged in the working box, an air outlet of the air blower is communicated with the working box, and the working box is communicated with the battery box. The utility model provides a system which exchanges heat with a power battery, and the system can be switched to cool or heat the power battery according to the operating environment temperature of the power battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to the equipment field of power battery package, especially with power battery heat exchange's system. BACKGROUND

[0002] Power battery as the core component of electric automobile, directly influences the working performance of electric automobile, among them lithium battery because its excellent energy density, power output characteristic and long life etc.

[0003] When power battery carries out charging and discharging, high temperature will be produced, and high temperature makes the side reaction between active material and electrolyte in lithium battery, leads to lithium battery capacity loss, at this time, the power battery needs to be cooled, and the temperature of the power battery is in the best operating temperature, when the vehicle runs in the cold winter, the low temperature surrounding environment can further reduce the operating temperature of the power battery, the electrolyte ion migration rate of lithium battery slows down, causes the internal resistance of the battery to increase, affects the transmission of current, and the capacity of the lithium battery is reduced, at this time, the power battery needs to be heated, and the temperature of the power battery is in the best operating temperature.

[0004] However, the existing power battery has no thermal management system or only a single refrigeration or heating system, and the operating temperature of the battery cannot be controlled according to the temperature of the use environment. INVENTION CONTENTS

[0005] The utility model discloses a kind of with power battery heat exchange's system, can according to the use environment temperature of power battery, switch the operating mode of this system for power battery cooling or heating.

[0006] The utility model discloses a kind of with power battery heat exchange's system adopts the technical scheme that:

[0007] Including battery box, three-way valve, air inlet pipe, exhaust pipe, air blower and heat exchange mechanism, temperature sensor is equipped in the battery box, one of the battery box and three-way valve is communicated, the other two of three-way valve are communicated with air inlet pipe and exhaust pipe respectively, air valve is communicated on the air inlet pipe, air filter is communicated on the air inlet pipe, the air inlet of air blower is communicated with air inlet pipe, the heat exchange mechanism includes working tank, heater and evaporator are equipped in the working tank, the air outlet of air blower is communicated with working tank, the working tank is communicated with battery box.

[0008] As preferred scheme, it further includes gas storage tank, the gas storage tank is communicated with air inlet pipe, the gas storage tank is communicated with three-way valve, one-way valve is communicated on the gas storage tank, the gas storage tank is communicated with the air inlet of air blower.

[0009] As a preferred scheme, the filter core is arranged in the gas storage tank, the filter core divides the inside of the gas storage tank into a first cavity and a second cavity, the communication between the gas storage tank and the air inlet pipe is located in the first cavity, the communication between the gas storage tank and the three-way valve is located in the first cavity, the communication between the gas storage tank and the one-way valve is located in the first cavity, and the communication between the gas storage tank and the air blower is located in the second cavity.

[0010] As a preferred scheme, the air filter is provided with a dust outlet.

[0011] As a preferred scheme, the air inlet of the air blower is communicated with a first pipeline, the first pipeline is communicated with the second cavity, the air outlet of the air blower is communicated with a second pipeline, the second pipeline is communicated with the working tank, and the diameter of the second pipeline is smaller than that of the first pipeline.

[0012] As a preferred scheme, the filter tank is communicated between the battery tank and the working tank, and the fire-fighting device is communicated on the battery tank.

[0013] As a preferred scheme, the battery tank is combined by a tank body and a cover plate, a plurality of groups of battery groups are arranged in the tank body at intervals, a first air duct is formed between the battery groups and the inner wall of the tank body, a second air duct is formed between two adjacent battery groups, and the first air duct and the second air duct are communicated.

[0014] As a preferred scheme, a plurality of partitions are arranged in the tank body, the partitions are in contact with adjacent battery groups, the partitions cut off the first air duct, and the first air duct and the second air duct form a serpentine and reciprocatingly inserted channel.

[0015] As a preferred scheme, a plurality of groove positions are arranged in the tank body at intervals, the battery groups are arranged in the groove positions, and a connecting wire is electrically connected between two adjacent battery groups, wherein the two groups of battery groups are respectively electrically connected with a positive electrode wire and a negative electrode wire.

[0016] The system for heat exchange with the power battery has the following beneficial effects:

[0017] When the battery tank operates in an environment with a higher temperature, the air valve is opened, the air blower extracts air from the outside through the air inlet pipe, the air blower sends the air into the working tank, the heater stops operating, the evaporator starts operating, the evaporator exchanges heat with the air to become cold air, the working tank injects the cold air into the battery tank and converts the cold air into hot air to cool the battery tank; because the air temperature of the environment is lower than that of the hot air in the battery tank, the three-way valve opens the communication with the exhaust pipe, so that the hot air at a high temperature can be discharged from the exhaust pipe, and the circulation of the hot air at a high temperature in the system is avoided.

[0018] When the battery box is running in a low temperature environment, the air valve is closed, the air blower extracts the cold air in the battery box and injects it into the working box, the heater starts to run, and the evaporator stops running. The heater exchanges heat with the air to become hot air, the working box injects the hot air into the battery box and converts it into cold air; due to the low ambient temperature, the cold air after heat exchange with the battery box is higher than the ambient temperature, the three-way valve is opened to communicate with the air inlet pipe, so that the air circulates in the system to avoid the entry of cold air with lower external temperature into the system; thereby realizing switching according to the ambient temperature during use of the battery box to heat or cool the battery box.

[0019] When the air humidity in the environment is too high, the air circulation in the system can also be used to run to avoid the entry of water vapor into the battery box. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the system for heat exchange with the power battery of the utility model.

[0021] Figure 2 is a battery box installation schematic view of the system for heat exchange with the power battery of the utility model.

[0022] Figure 3 is a box cross-sectional view of the system for heat exchange with the power battery of the utility model.

[0023] Figure 4 is a battery pack structure schematic view of the system for heat exchange with the power battery of the utility model.

[0024] Figure 5 is a gas storage tank cross-sectional view of the system for heat exchange with the power battery of the utility model.

[0025] Figure 6 is an air blower structure schematic view of the system for heat exchange with the power battery of the utility model.

[0026] Figure 7 is a heat exchange mechanism structure schematic view of the system for heat exchange with the power battery of the utility model.

[0027] Figure 8 is a filter tank and fire-fighting mechanism structure schematic view of the system for heat exchange with the power battery of the utility model. DETAILED DESCRIPTION

[0028] The utility model will be further described and explained in combination with specific embodiments and the drawings of the specification:

[0029] Please refer to Figure 1 .

[0030] The utility model discloses a system of heat exchange with power battery, including battery box 1, three -way valve 2, air inlet pipe 31, exhaust pipe 21, gas holder 3, air blower 4 and heat exchange mechanism 5.

[0031] Please refer to Figures 1-3 .

[0032] The battery box 1 is provided with a temperature sensor for monitoring the operating temperature of the battery box 1. The battery box 1 is preferably composed of a box body 11 and a cover plate 12. The cover plate 12 is arranged on the box body 11. A plurality of groove positions 111 are arranged in the box body 11. A plurality of battery groups 13 are arranged in the box body 11. The battery groups 13 are arranged in the groove positions 111.

[0033] Further, the first air duct 112 is formed between the battery group 13 and the inner wall of the box body 11. The second air duct 113 is formed between two adjacent battery groups 13. The first air duct 112 and the second air duct 113 are communicated. A plurality of partitions 114 are arranged in the box body 11. The partitions 114 are arranged on the adjacent battery groups 13. The partitions 114 cut off the first air duct 112. The first air duct 112 and the second air duct 113 form a serpentine channel. The air inlet and the air outlet of the battery box 1 are arranged near the two ends of the channel. The cold air or the hot air can flow in the channel and contact each battery group for heat exchange.

[0034] The air outlet of the battery box 1 is communicated with one of the three-way valve 2. The other two of the three-way valve 2 are communicated with the gas holder 3 and the exhaust pipe 21. When the three-way valve 2 is opened and communicated with the exhaust pipe 21, it is closed with the gas holder 3. When the three-way valve 2 is opened and communicated with the gas holder 3, it is closed with the exhaust pipe 21.

[0035] Please refer to Figure 3 and Figure 4 .

[0036] The two adjacent battery groups 13 are electrically connected by a connecting wire 131. The plurality of battery groups are connected in series by the plurality of connecting wires. The two battery groups 13 are electrically connected by a positive electrode wire 132 and a negative electrode wire 133. The positive electrode wire 132 and the negative electrode wire 133 are arranged outside the box body 11.

[0037] Further, the battery group 13 is preferably rectangular. The rectangular battery group 13 can increase the contact area between the battery group 13 and the air, and improve the heat exchange efficiency between the air and the battery group 13. The battery group 13 is provided with a protrusion. The protrusion is preferably wavy. The protrusion can further improve the heat exchange efficiency between the air and the battery group 13, and can buffer the impact force when the battery group 13 is impacted.

[0038] Please refer to Figure 1 ,Figure 5 and Figure 6 .

[0039] The gas tank 3 is communicated with the air inlet pipe 31, and the outside air enters the gas tank 3 through the air inlet pipe 31 to supplement the air content of the gas tank 3. The gas tank 3 is communicated with a one-way valve 32. When the air pressure in the gas tank 3 is high, the air in the gas tank 3 can be discharged from the one-way valve 32, thereby reducing the air pressure in the system. The air inlet pipe 31 is communicated with an air filter 311. In this embodiment, the air filter 311 is preferably a vortex filter. The air filter 311 is provided with a dust outlet 312. The air inlet pipe 31 is communicated with an air valve 313. By opening or closing the air valve 313, the air flow through the air inlet pipe 31 is controlled to be conducted or cut off. In addition, the air flowing in the air inlet pipe 31 needs to pass through the air filter 311. The air filter 311 filters the impurities in the air to prevent the impurities in the air from entering the system. The filtered impurities are discharged from the dust outlet 312.

[0040] Further, the gas tank 3 is provided with a filter element 33. The filter element 33 divides the inside of the gas tank 3 into a first cavity 34 and a second cavity 35. The communication between the gas tank 3 and the air inlet pipe 31 is located in the first cavity 34. The gas tank 3 is communicated with the three-way valve 2, and the communication between the gas tank 3 and the three-way valve 2 is located in the first cavity 34. The communication between the gas tank 3 and the one-way valve 32 is located in the first cavity 34. The air entering the first cavity 34 from the three-way valve 2 and the air inlet pipe 31 needs to pass through the filter element 33 to enter the second cavity 35. The filter element 33 filters the impurities in the air to prevent the impurities from circulating in the system.

[0041] The air inlet of the air blower 4 is communicated with a first pipe 41. The air inlet of the air blower 4 is communicated with the air inlet pipe 31 through the gas tank 3. The air inlet of the air blower 4 is communicated with the second cavity 35 through the first pipe 41. The air inlet of the air blower 4 is communicated with the three-way valve 2 through the gas tank 3. The air outlet of the air blower 4 is communicated with a second pipe 42. The diameter of the second pipe 42 is smaller than that of the first pipe 41. The small-diameter second pipe 42 can compress the air when the air blower 4 blows out the air. The air blower 4 drives the air flow in the system.

[0042] Please refer to Figure 1 , Figure 7 and Figure 8 .

[0043] The heat exchange mechanism 5 includes a working box 51. The air outlet of the blower 4 is connected to the working box 51 through a second pipe 42. The working box 51 is equipped with a heater 511 and an evaporator 512. The evaporator 512 is connected to the refrigeration device. A filter canister 6 is connected between the battery box 1 and the working box 51. The working box 51 is connected to the battery box 1 through the filter canister 6. The filter canister 6 filters the air injected into the battery box 1 from the working box 51. When the heater 511 is running, the evaporator 512 stops running, and when the evaporator 512 is running, the heater 511 stops running.

[0044] Furthermore, a pressure sensor is installed at the connection between the filter canister 6 and the battery box 1. Since the distance between the two adjacent battery packs 13 is narrow, when one of the battery packs 13 bulges and expands, it will block the channel, causing poor air circulation in the channel. The pressure sensor is used to monitor whether the air circulation inside the battery box 1 is smooth, so as to monitor the operation of the battery pack 13.

[0045] The battery box 1 is connected to a fire-fighting device 7. In this embodiment, the fire-fighting device 7 is preferably a dry ice fire extinguisher. When the temperature of the battery pack 13 inside the battery box 1 is too high and the temperature sensor detects a fire, the fire-fighting device injects dry ice into the battery box 1, which can quickly reduce the temperature inside the battery box 1 and isolate oxygen to extinguish the fire.

[0046] Please refer to Figures 1-8 .

[0047] At runtime:

[0048] When the battery box 1 is operating in a high-temperature environment, the operating temperature of the battery box 1 is monitored by a temperature sensor. When the operating temperature of the battery box 1 is high, the air valve 313 is opened, and the blower 4 draws air from the air inlet pipe 31 through the air tank 3 and injects the air into the working box. The evaporator 512 starts to operate, and the air exchanges heat with the evaporator 512 to convert into cold air. The working box 51 injects the cold air into the battery box 1 through the filter canister 6. The cold air flows along the channel and exchanges heat with the battery packs 13 on both sides of the channel to convert into hot air. The three-way valve 2 closes the connection with the air tank 3 and opens the connection with the exhaust pipe 21. The hot air is discharged from the exhaust pipe 21 to cool the battery packs 13. Since the ambient air temperature is lower than the hot air temperature inside the battery box 1, the high-temperature hot air is discharged from the exhaust pipe 21 to avoid the high-temperature hot air circulating within the system.

[0049] When the battery box 1 is running in a lower temperature environment, the running temperature of the battery box 1 is monitored by the temperature sensor, and when the running temperature of the battery box 1 is low, the air valve 313 is closed, the air tank 3 is extracted from the battery box 1 by the air tank 3, and the air tank 3 is injected into the working tank; the heater 511 starts to run, and the air is exchanged with the heater 511 to convert into hot air, and the working tank 51 is injected into the battery box 1 through the filter tank 6; the hot air flows along the channel and exchanges with the battery pack 13 on both sides of the channel to convert into cold air, so that the battery pack 13 is heated to run in the best temperature; because the air temperature of the environment is lower than the cold air temperature in the battery box 1, the three-way valve 2 is opened to communicate with the air tank 3, so that the cold air in the battery box 1 reenters the air tank 3, so that the cold air circulates in the system, and the lower temperature of the external cold air is prevented from entering the system; when the air humidity in the environment is too high, the air circulation mode can also be used to run, so that the water vapor is prevented from entering the battery box 1.

[0050] When the temperature sensor detects a fire, the air valve 313 is closed, the air blower 4 stops running, so that the oxygen in the environment cannot enter the battery box 1 through the system to affect the fire, the fire extinguishing device 7 starts to inject dry ice into the battery box 1, the three-way valve 2 is opened to communicate with the exhaust pipe 21, and the dry ice discharges the high temperature in the battery box 1 from the exhaust pipe 21, so that the efficiency of fire extinguishing is improved.

[0051] The utility model provides a kind of system of heat exchange with power battery, when battery box is in higher temperature environment runs, air valve opens, air blower extracts air from outside by air inlet pipe, air blower sends air into working tank, heater stops running, evaporimeter starts to run, evaporimeter exchanges with air to convert into cold air, and working tank injects cold air into battery box and converts into hot air for battery box cooling;Because the air temperature of the environment is lower than the hot air temperature in the battery box, three-way valve opens to communicate with exhaust pipe, so that high-temperature hot air can be discharged from exhaust pipe, and high-temperature hot air is prevented from circulating in the system.

[0052] When the battery box is running in a lower temperature environment, the air valve is closed, the air blower extracts the cold air in the battery box and injects it into the working tank, the heater starts to run, the evaporimeter stops running, the heater exchanges with air to convert into hot air, and the working tank injects hot air into the battery box and converts into cold air for the battery box heating;Because the environment temperature is low, the cold air after heat exchange with the battery box is higher than the temperature of the environment, the three-way valve is opened to communicate with the air inlet pipe, so that air circulates in the system, and the lower temperature of the external cold air is prevented from entering the system;So as to realize the switching for battery box heating or cooling according to the environment temperature in the use of battery box.

[0053] When the air water vapor content in the environment is too high, the system can also be operated in a way that air circulates in the system to avoid water vapor entering the battery box.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application.

Claims

1. A system for heat exchange with a power battery, characterized in that, The battery box, the three-way valve, the air inlet pipe, the air outlet pipe, the air blower and the heat exchange mechanism are included. The battery box is provided with a temperature sensor, and is communicated with one of the three-way valve. The air inlet pipe is communicated with the air blower. The heat exchange mechanism includes a working box, and the working box is provided with a heater and an evaporator.

2. The system for heat exchange with a power battery according to claim 1, wherein, The air tank is communicated with the air inlet pipe, the three-way valve, and the air blower.

3. The system for heat exchanging with a power battery according to claim 2, wherein, The air tank is provided with a filter element, and the filter element divides the air tank into a first cavity and a second cavity.

4. The system for heat exchanging with a power battery according to claim 3, wherein, The air filter is provided with a dust outlet.

5. The system for heat exchanging with a power battery according to claim 4, wherein, The air inlet of the air blower is communicated with a first pipe, and the first pipe is communicated with the second cavity.

6. The system for heat exchanging with a power battery according to claim 5, wherein, The battery box is communicated with the working box through a filter tank.

7. A system for heat exchange with a power battery as claimed in any one of claims 1 or 6, characterized in that, The battery box is combined by a box body and a cover plate.

8. The system for heat exchanging with a power battery according to claim 7, wherein, The box body is provided with a plurality of groups of battery banks arranged at intervals.

9. The system for heat exchanging with a power battery according to claim 8, wherein, The box body is provided with a plurality of grooves arranged at intervals. The battery banks are arranged in the grooves. Two adjacent battery banks are electrically connected by a connecting wire. Two battery banks are respectively electrically connected by a positive wire and a negative wire.

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