Battery liquid cooling unit heating system based on electromagnetic induction

Abstract

The utility model discloses a battery liquid cooling unit heating system based on electromagnetic induction, which comprises an induction heating coil arranged on a liquid cooling pipe of a battery liquid cooling unit, a battery liquid cooling plate and a heat exchanger are connected into a loop by the liquid cooling pipe, and a circulating water pump is arranged on the loop to drive a liquid medium in the liquid cooling pipe to circulate in the liquid cooling pipe. The induction heating coil is electrically connected with a power supply through a ZVS driving module, and the ZVS driving module outputs alternating current to the induction heating coil to perform induction heating on a liquid medium flowing through the liquid cooling pipe. The induction heating technology is innovatively adopted in the battery liquid cooling unit, the temperature control stability of a battery energy storage system in an extreme environment is improved, the power consumption of existing PTC electric heating is reduced, the heating energy efficiency ratio is high, the induction heating structure is convenient to maintain, and the heating system is high in control reliability.

Description

Technical Field

[0001] The utility model relates to a battery liquid cooling unit heating system based on electromagnetic induction, belonging to battery energy storage temperature control technology. Background Art

[0002] With the increasing penetration of distributed wind power and photovoltaic intermittent power sources in medium and low voltage distribution networks, the installed capacity of energy storage cabinets in industrial and commercial energy storage systems is also increasing. The geographical location and environmental changes of distributed energy storage cabinets are diverse. In areas with low temperatures year-round, such as high altitudes, or in areas with low winter temperatures, the ambient temperature of the energy storage cabinet is often lower than the battery startup temperature. During the startup phase of the energy storage cabinet, in order to maintain the stability of the energy storage cabinet battery system, it is extremely important to effectively control the battery system temperature within the set range. Existing energy storage cabinets are designed with liquid cooling units to dissipate heat and cool the operating batteries. Energy storage cabinets in extreme temperature environments will use liquid cooling units with heating modules as part of the temperature control system to heat the batteries during the startup phase so that the battery system quickly reaches the operating temperature.

[0003] Currently, PTC electric heaters are widely used in energy storage cabinet liquid cooling systems. These use PTC (Positive Temperature Coefficient) thermistors as heating elements. When current passes through a PTC thermistor, Joule heat is generated. As the current increases, the temperature of the PTC thermistor also rises, generating more Joule heat. This heats the liquid passing through the PTC and is then pumped to the battery liquid cooling plate via a circulating water pump, ultimately raising the battery pack within the energy storage cabinet to above the set minimum operating temperature. PTC is a semiconductor material or component with a large positive temperature coefficient. Its resistance increases stepwise with increasing temperature. However, this has the following drawbacks during use:

[0004] (1) High power consumption and high manufacturing cost. Especially in some high-power applications, such as electric vehicle heating systems and liquid cooling machine pipe heating systems, the power consumption of PTC heaters is still relatively high, which directly affects the range of electric vehicles and increases the overall power consumption of liquid cooling units. The manufacturing cost of PTC heaters is relatively high, mainly because they use precious materials such as silver and palladium. In addition, the design and manufacturing process of PTC heaters is relatively complex, and during assembly, connectors are required between the tubes, which affects the airtightness and increases their use cost.

[0005] (2) Low reliability and high maintenance costs. The lack of local and cloud-controlled circuits and software applications makes variable frequency control impossible. PTC heaters generally only have built-in fuses to physically cut off the circuit. Once the fuse is triggered, the entire unit shuts down and cannot continue to operate. This not only increases equipment maintenance costs in remote areas but also affects the balance of the microgrid. In addition, if the PTC ceramic body breaks down and burns, or the insulation layer breaks down and leaks electricity, it may cause a short circuit or the outer casing to be charged, thus posing a safety hazard.

[0006] (3) Affected by ambient temperature. Although PTC heaters have the characteristic of self-controlling temperature, their heating effect is easily affected in extremely low temperature environments. Because the heat generated by PTC heaters is related to the ambient temperature, when the ambient temperature is too low, the heat generated by PTC heaters will be significantly reduced.

[0007] (4) In the liquid cooling unit, the PTC heater is connected to the water pipe by a connector, which results in the air tightness of the water inlet and outlet ends being significantly lower than that of a complete water pipe. With long-term operation and environmental shocks, the water pressure and air pressure in the pipe will change, resulting in the need for frequent maintenance, such as adding liquid and measuring. Utility Model Content

[0008] The technical problem solved by the utility model is: to provide a battery liquid cooling unit heating system based on electromagnetic induction in view of the above-mentioned problems existing in the existing battery liquid cooling unit using PTC electric heaters.

[0009] The utility model is implemented by the following technical solutions:

[0010] A battery liquid cooling unit heating system based on electromagnetic induction includes an induction heating coil 11 arranged on a liquid cooling pipe of the battery liquid cooling unit. The liquid cooling pipe connects the battery liquid cooling plate 3 and the heat exchanger 4 to form a loop. A circulating water pump 12 is provided in the loop to drive the liquid medium inside the liquid cooling pipe to circulate within the liquid cooling pipe. The induction heating coil 11 is electrically connected to a power supply 200 via a ZVS drive module 100. The ZVS drive module 100 outputs an alternating current to the induction heating coil to inductively heat the liquid medium flowing through the liquid cooling pipe.

[0011] In the electromagnetic induction-based battery liquid cooling unit heating system of the present invention, further, the induction heating coil 11 is sequentially covered with an insulating ceramic tube 111 and an electromagnetic shielding cover 112 .

[0012] In the battery liquid cooling unit heating system based on electromagnetic induction of the present invention, further, the induction heating coil 11 is a U-shaped or O-shaped tapless induction coil wrapped around the liquid cooling tube.

[0013] In the battery liquid cooling unit heating system based on electromagnetic induction of the present invention, further, a pressure balancing expansion tank 15 is provided on the liquid cooling pipe.

[0014] In a battery liquid cooling unit heating system based on electromagnetic induction of the present invention, further, the heat exchanger 4 is a plate heat exchanger, the liquid cooling pipe is connected to the heat exchange pipe through the plate heat exchanger, and the heat exchange pipe is a condensing heat exchange pipe, which is provided with a condenser 21, a compressor 22 and an electronic expansion valve 23.

[0015] In a battery liquid cooling unit heating system based on electromagnetic induction of the present invention, further, the ZVS driving module 100 is provided with a zero voltage switching circuit, including an oscillating capacitor and an oscillating inductor connected to form an LC oscillation circuit through two MOS tubes. The two MOS tubes are connected in parallel between the DC power supply and the oscillating capacitor and the oscillating inductor, and each is connected to a group of fast recovery diodes to achieve alternating switching. Each of the MOS tubes is respectively configured with a pull-down resistor, a current limiting resistor and a voltage regulator diode.

[0016] In the electromagnetic induction-based battery liquid cooling unit heating system of the present invention, further, an MCU module 300 is included. The MCU module 300 is electrically connected to the ZVS drive module 100 and drives the ZVS drive module to control the induction heating coil 11 according to the control signal of the host computer.

[0017] In the electromagnetic induction-based battery liquid cooling unit heating system of the present invention, further, the MCU module 300 is electrically connected to the ZVS driving module 100 through the isolation module 400.

[0018] In a battery liquid cooling unit heating system based on electromagnetic induction of the present invention, further, a temperature sensor for detecting the temperature of the liquid medium in the pipeline is provided on the liquid cooling pipe, and the temperature sensor is connected to the MCU module 300 in turn through the filtering and amplifying module 700 and the digital-to-analog conversion module 600 for communication.

[0019] In a battery liquid cooling unit heating system based on electromagnetic induction of the present invention, further, the temperature sensor includes a water outlet temperature sensor 13 provided at the heating water outlet end of the induction heating coil 11 of the liquid cooling pipe, and a return water temperature sensor 14 provided at the return water end of the battery liquid cooling plate 3.

[0020] The utility model adopts the above technical solution to achieve the following beneficial effects:

[0021] (1) The present invention uses electromagnetic induction heating to replace traditional PTC heating, thereby improving heating efficiency and speed. Its circuit design is easy to implement and uses a ZVS zero voltage switch to drive the induction heating coil. Switching is performed under zero voltage conditions, thereby eliminating voltage shock and switching losses during the switching process and significantly improving circuit efficiency. The switching process of the induction heating coil is carried out under zero voltage, which reduces the electromagnetic interference generated during the switching process and is conducive to improving the quality and stability of the power supply. The reduction in switching losses allows the ZVS circuit to operate at a higher switching frequency, thereby reducing the volume and weight of the circuit filter and improving the dynamic response capability of the power supply.

[0022] (2) The present invention adopts a tapless induction coil, which is a continuous, uninterrupted coil solution without a dedicated tap point. Due to the tapless design, the current flows throughout the coil, generating a uniform magnetic field, thereby achieving uniform heating of the workpiece. The electromagnetic induction principle is utilized to increase the temperature of the liquid medium in the liquid cooling tube due to the eddy current effect, and the heating efficiency will not be reduced due to sudden changes in the external environment. The induction heating coil and the liquid cooling tube are non-contact heating, which does not affect the sealing of the liquid cooling tube and is also very convenient for maintenance of the induction heating coil.

[0023] (3) The present invention also provides a hardware design for the heating system of the battery liquid cooling unit, which uses the MCU module as the main control to collect the temperature signal of the liquid medium in the liquid cooling tube and feedback to control the heating of the liquid cooling unit, so as to facilitate integration with the host computer of the battery management system. For the complex electromagnetic field noise signals in the induction coil and the battery energy storage cabinet, an isolation module is set to eliminate the noise signals, so that the control is more precise, with higher system performance and lower power consumption.

[0024] In summary, the present invention innovatively adopts induction heating technology in the battery liquid cooling unit, which improves the temperature control stability of the battery energy storage system in extreme environments, reduces the power consumption of existing PTC electric heating, has a high heating energy efficiency ratio, and the induction heating structure is easy to maintain, and the heating system control reliability is high.

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of a battery liquid cooling unit using the heating system of the present invention in an embodiment.

[0027] Figure 2 It is a partial schematic diagram of the induction heating coil and the ZVS driving module in the embodiment.

[0028] Figure 3a 、 3bSchematic diagrams of two winding structures of the induction heating coil in the embodiment.

[0029] Figure 4 This is a hardware block diagram of the electromagnetic induction-based battery liquid cooling unit heating system control in an embodiment.

[0030] Figure 5 Schematic diagram of a zero voltage switching circuit in a ZVS driving module in an embodiment.

[0031] Numbers in the figure: 1-liquid cooling pipe, 11-induction heating coil, 111-insulating ceramic tube, 112-electromagnetic shielding cover, 12-circulating water pump, 13-outlet water temperature sensor, 14-return water temperature sensor, 15-pressure balance expansion tank, 2-heat exchange tube, 21-condenser, 22-compressor, 23-electronic expansion valve, 24-low pressure sensor, 25-high pressure sensor, 3-battery liquid cooling plate, 4-heat exchanger, 5-condensing fan, 100-ZVS driver module, 200-power supply, 300-MCU module, 400-isolation module, 500-filter protection module, 600-digital-to-analog conversion module, 700-filter amplifier module. DETAILED DESCRIPTION

[0032] Example

[0033] See also Figure 1 and Figure 2The battery liquid cooling unit shown in the figure is an implementation scheme of the present invention. The battery liquid cooling unit includes a liquid cooling pipe 1, an induction heating coil 11, a circulating water pump 12, an outlet water temperature sensor 13, a return water temperature sensor 14, a pressure balance expansion tank 15, a heat exchange pipe 2, a condenser 21, a compressor 22, an electronic expansion valve 23, a low-pressure pressure sensor 24, a high-pressure pressure sensor 25, a battery liquid cooling plate 3, a heat exchanger 4, and a condensing fan 5. The liquid cooling pipe 1 connects the battery liquid cooling plate 3 and the heat exchanger 4 to form a loop. A circulating water pump 12 and an induction heating coil 11 are provided on the liquid cooling pipe 1. The circulating water pump 12 drives the liquid medium in the liquid cooling pipe to circulate in the liquid cooling pipe. When cooling the battery operating temperature, the liquid medium in the liquid cooling pipe circulates to the battery liquid cooling plate 3 to absorb heat and heat the battery. After circulating to the heat exchanger 4, it exchanges heat with the cooling medium in the heat exchange pipe 2 to cool the battery, and then circulates to the battery liquid cooling plate 3 again to cool the battery. The induction heating coil 11 inductively heats the liquid medium flowing through the liquid cooling pipe, which is used to heat the battery when the battery is below the working starting temperature. The circulating water pump 12 circulates the liquid medium in the liquid cooling pipe to the battery liquid cooling plate 3 to heat the battery. The induction heating coil 11 continuously heats the liquid medium in the liquid cooling pipe to achieve rapid heating of the battery to the starting working temperature. The outlet water temperature sensor 13 and the return water temperature sensor 14 respectively detect the temperature of the medium in the heated liquid cooling pipe and the temperature of the medium after heat exchange in the battery liquid cooling plate 3. The pressure balancing expansion tank 15 is used to buffer the sudden pressure change of the liquid medium in the buffer cooling pipe due to temperature change.

[0034] like Figure 2 As shown, the liquid cooling tube 1, at least in the section surrounded by the induction heating coil 11, uses a metal water pipe to be heated by the induction heating coil 11. The low-temperature liquid medium in the liquid cooling tube 1 flows from the left into the pipe section surrounded by the induction heating coil. The ZVS driver module 100 drives the induction heating coil 11 to generate an alternating excitation signal, causing eddy currents in the pipe to generate heat, which is then transferred to the liquid. The heated refrigerant flows out of the right side of the pipe section and is transported to the battery liquid cooling plate 3 above. Ultimately, the temperature is controlled above the minimum temperature set by the battery system, protecting the battery load from stable operation and extending its service life. To prevent EMI interference leakage during the induction heating coil power-up process and affecting the battery operating environment, an insulating ceramic tube 111 and an electromagnetic shield 112 are installed in sequence around the induction heating coil 11. The ceramic insulating tube 111 provides circuit insulation for the induction heating coil, and the electromagnetic shield 112 provides magnetic field shielding for the induction heating coil.

[0035] like Figure 3a and Figure 3bAs shown, the induction heating coil 11 of this embodiment adopts a U-shaped or O-shaped tapless induction coil to wrap the liquid cooling tube 1. The U-shaped induction heating coil semi-encloses the liquid cooling tube, which has higher flexibility and is easier to maintain than the fully enclosed design of the O-shaped induction heating coil. It can be adjusted and customized according to different workpiece shapes and heating requirements. By changing the number of turns, spacing and arrangement of the coil, precise control of the magnetic field and heating effect can be achieved; the structure of the U-shaped induction heating coil is relatively simple, and it is easier to disassemble and install. In the battery liquid cooling unit, the metal water pipe passes through the U-shaped coil, and there is no need to disassemble the water pipe to bypass the protruding components. This helps to reduce maintenance costs and time and improve the operating efficiency of the equipment.

[0036] When the induction heating coil 11 heats the liquid cooling pipe 1, the coil and the pipe are non-contact and have a certain electrical safety distance; the induction heating coil 11 is made of mica and glass fiber, with a rated temperature of 500°C and a long-term operating temperature of 300°C-500°C-800°C, which complies with the standard GB10666.6-90.

[0037] In addition, in this embodiment, the heat exchanger 4 is a plate heat exchanger, and the liquid cooling tube 1 is connected to the heat exchange tube 2 through the plate heat exchanger. The heat exchange tube 2 exchanges heat and cools with the liquid cooling tube 1 in a condensation cooling manner. A condenser 21, a compressor 22 and an electronic expansion valve 23 are provided on the heat exchange tube 2.

[0038] The working process of heating the battery by the battery liquid cooling unit of this embodiment is as follows:

[0039] (1) When the return water temperature sensor 14 detects that the return water temperature of the battery liquid cooling plate is lower than the heating set point, the induction heating coil is started to heat the liquid medium in the liquid cooling pipe 1.

[0040] (2) The liquid cooling unit control system adjusts the output voltage of the induction heating coil according to the demand signal returned by the outlet water temperature sensor or the host computer, thereby controlling the power of the entire unit and the outlet water temperature.

[0041] (3) At the same time, the circulating water pump 12 on the liquid cooling pipe 1 runs at full power, and the refrigeration cycle on the right heat exchange pipe stops working.

[0042] After the temperature of the liquid medium in the liquid cooling pipe 1 is increased, it is transported to the battery load cold plate through the circulating water pump to increase the battery temperature to a predetermined target.

[0043] The working process of the battery liquid cooling unit to cool the battery during operation is as follows:

[0044] (1) When the return water temperature sensor 14 detects that the return water temperature of the battery liquid cooling plate reaches the cooling set point, the compressor is started to compress the gaseous refrigerant.

[0045] (2) The liquid cooling unit control system starts the compressor motor on the heat exchange tube 2 to adjust the speed in accordance with the load according to the outlet liquid temperature of the return water temperature sensor 14 or the demand signal sent by the host computer, and starts to control the power of the whole machine and the outlet water temperature of the battery liquid cooling plate through the heat exchanger 4.

[0046] (3) The condenser 21 condenses the high-temperature refrigerant in the heat exchange tube 2 after heat exchange with the liquid cooling tube 1. The refrigerant changes from gas to liquid, and the external air is sucked in through the condensing fan 5, and the heat released during the condensation of the refrigerant is discharged into the surrounding air.

[0047] (4) The refrigerant in the heat exchange tube 2, after being cooled, enters the plate heat exchanger 4, absorbs the heat of the liquid medium in the liquid cooling tube 1 flowing through the plate heat exchanger, and evaporates into gas again. The liquid medium cooled in the liquid cooling tube 1 is continuously transported to the battery liquid cooling plate 3 through the circulating water pump 12 to cool the battery pack.

[0048] (5) The electronic expansion valve 23 on the heat exchange tube 2 throttles and reduces the pressure of the condensed refrigerant. The low-pressure pressure sensor 24 and the high-pressure pressure sensor 25 are respectively located on the heat exchange tube 2 at both ends of the plate heat exchanger to detect the refrigerant pressure in the heat exchange tube 2.

[0049] In this embodiment, the operation is performed according to the outlet water temperature (TA) in the fully automatic mode. The fully automatic mode includes three operating modes: cooling, heating and circulation.

[0050] In full-automatic mode, the corresponding relationship between water outlet temperature and operating mode is shown in the following table:

[0051] TA>=21° 15<=TA<=18° TA<=12° Refrigeration cycle Heating

[0052] Hysteresis setting: If the hysteresis of heating and cooling is 3℃, when the liquid temperature is lower than 12℃, it will enter the circulation mode when it is heated to 15℃; when the liquid temperature is higher than 21℃, it will enter the circulation mode when it is cooled to 18℃.

[0053] The corresponding relationships among the operating states of the circulating water pump speed control, induction heating coil switch control, compressor speed control, condensing fan speed control, and electronic expansion valve opening control are shown in the following table:

[0054]

[0055] See again Figure 2 In this embodiment, the induction heating coil 11 is electrically connected to the DC power supply 200 via the ZVS driving module 100. The ZVS driving module 100 outputs an alternating current to the induction heating coil 11 to inductively heat the liquid medium flowing through the liquid cooling tube. Figure 5As shown, the ZVS driver module 100 is provided with a zero voltage switching circuit, including an oscillating capacitor and an oscillating inductor connected to form an LC oscillation circuit through two MOS transistors. The two MOS transistors are connected in parallel between the DC power supply and the oscillating capacitor and the oscillating inductor, and each is connected to a group of fast recovery diodes to achieve alternating switching. Each MOS transistor is respectively configured with a pull-down resistor, a current limiting resistor and a voltage regulator diode.

[0056] Specifically, an oscillating capacitor C1 and an oscillating inductor L3 are connected in parallel to form an LC oscillating circuit. This oscillating circuit is connected to the supply voltage of the ZVS driver module from a DC power supply via MOS transistors Q1 and Q2, which are alternately switched. The MOS transistors are connected to the DC power supply and the oscillating circuit via their gates and drains, with their sources grounded. A first inductor L1 is connected in parallel to terminal A of the MOS transistor Q1 and the LC oscillating circuit, and a second inductor L2 is connected in parallel to terminal B of the MOS transistor Q2. L1 and L2 act as chokes and freewheeling currents for their respective connected circuits, preventing a short circuit between the power supply and ground when the MOS transistors are turned on. The gates of MOS transistors Q1 and Q2 are also connected to the DC power supply via current-limiting resistors R3 and R4, respectively, to limit the current passing through the MOS transistors. The gate of MOS transistor Q1 is connected to the drain of MOS transistor Q2 via a fast recovery diode D4, and the gate of MOS transistor Q2 is connected to the drain of MOS transistor Q1 via a fast recovery diode D3. When one MOS transistor is turned on, the gate voltage of the other MOS transistor is pulled down and turned off, achieving alternating switching between the two MOS transistors. A pull-down resistor R1 and a zener diode D2 are connected in parallel between the gate and source of the MOS transistor Q1, and a pull-down resistor R2 and a zener diode D2 are connected in parallel between the gate and source of the MOS transistor Q2 to prevent the MOS transistor from being mis-turned on before power-on, thereby preventing a short circuit or oscillation failure.

[0057] The zero-voltage switching circuit in the ZVS driver module operates as follows: assuming MOS transistor Q2 turns on first, points B and D are pulled to ground, and MOS transistor Q1 is turned off. Under VCC excitation, the first inductor L1, the second inductor L2, and the oscillating inductor L3 store energy, suppressing the current and preventing it from increasing too quickly. The oscillating capacitor C1 is charged until VA = 12V. At this point, the first inductor L1 continues to discharge into the oscillating capacitor C1, causing VA to exceed 12V. When the reverse electromotive force of the first inductor L1 reaches its peak at point A, the first inductor L1 stops charging the oscillating capacitor C1, and the oscillating capacitor C1 begins discharging into the oscillating inductor L3 load. At this point, measuring the voltage between A and B reveals a peak voltage of 70V.

[0058] As the current of the oscillating inductor L3 increases, it approaches magnetic saturation, and its choke effect on the current decreases. It is equivalent to a "wire" and is grounded through the MOS tube Q2. At this time, the voltage at point A begins to drop, thereby lowering the voltage at point C. The internal resistance of the MOS tube Q2 slowly increases until the voltage at point B rises to the turn-on voltage of the MOS tube Q1. After the MOS tube Q1 is saturated and turned on, points A and C are pulled to the lowest voltage, causing the MOS tube Q2 to be completely cut off, completing the process of the two MOS tubes turning on and off.

[0059] like Figure 4 As shown, the hardware for controlling the heating of the induction heating coil also includes an MCU module 300. The MCU module 300 is electrically connected to the ZVS drive module 100, and drives the ZVS drive module to control the induction heating coil 11 according to the control signal of the upper computer. The MCU module 300 is electrically connected to the ZVS drive module 100 through the isolation module 400. The isolation module 400 provides electrical safety protection, prevents signal interference, improves system performance and output power, and can also achieve electrical isolation between high and low voltage modules (heating circuit and control circuit).

[0060] The power supply 200 of this embodiment uses TI's (Texas Instruments) 12V DC power supply TPS54231DR, which supplies power to the MCU module 300 and the isolation module 400 respectively. It is electrically connected to the ZVX driver module 100 through the filter protection module 500 to supply power to the induction heating coil. The control system of the entire induction heating coil is controlled by the MCU module 300 as the main control. The MCU module 300 in this embodiment uses ST's STM32F100C4T6, and the isolation module 400 uses TI's (Texas Instruments) SN74LV1T34DCKR. The filter protection module 500 removes interference signals transmitted from the power supply to the ZVX driver module 100, adjusts the signal spectrum, achieves signal smoothing, and attenuates EMI electromagnetic interference signals to ensure the normal operation of the electronic device and the quality of signal transmission. The filter protection module 500 in this embodiment uses Hongjia Orange's SMBJ6.5CA.

[0061] The liquid cooling tube is also equipped with temperature sensors that detect the temperature of the liquid medium within the tube. These include an outlet water temperature sensor 13 located at the heating outlet of the induction heating coil 11, and a return water temperature sensor 14 located at the return water end of the battery liquid cooling plate 3. The temperature sensors are connected to the MCU module 300 through a filter-amplifier module 700 and a digital-to-analog converter module 600. The filter-amplifier module 700 first amplifies the analog signal transmitted by the temperature sensor to ensure signal fidelity. The MCU module 300 receives the analog signal from the temperature sensor through the digital-to-analog converter module 600, converts the analog signal into a digital signal, and transmits it to the MCU. The MCU module 300 then controls the DC power supply 200 to power the ZVS driver module 100, which then outputs an alternating current to the induction heating coil 11. In this embodiment, the digital-to-analog converter module 600 uses the TI (Texas Instruments) ADS1110A0IDBVR, and the filter-amplifier module 700 uses the Murata (Murata) LFL18829MTCRD627. The above-mentioned modules are all mature electronic devices, and their specific working circuits are not described in detail in this embodiment.

[0062] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of the technical solution and the convenience of description. Therefore, they should not be understood as limitations on the present invention.

[0063] As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0064] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A battery liquid cooling unit heating system based on electromagnetic induction, characterized by: The invention comprises an induction heating coil (11) arranged on a liquid cooling pipe of a battery liquid cooling unit, wherein the liquid cooling pipe connects a battery liquid cooling plate (3) and a heat exchanger (4) to form a loop, and a circulating water pump (12) is provided on the liquid cooling pipe to drive a liquid medium inside the liquid cooling pipe to circulate in the liquid cooling pipe, and the induction heating coil (11) is electrically connected to a power supply (200) via a ZVS drive module (100), and the ZVS drive module (100) outputs an alternating current to the induction heating coil to inductively heat the liquid medium flowing through the liquid cooling pipe.

2. The battery liquid cooling unit heating system based on electromagnetic induction according to claim 1, characterized in that: The induction heating coil (11) is covered with an insulating ceramic tube (111) and an electromagnetic shielding cover (112) in sequence.

3. The battery liquid cooling unit heating system based on electromagnetic induction according to claim 2, characterized in that: The induction heating coil (11) is a U-shaped or O-shaped tapless induction coil wrapped around a liquid cooling tube.

4. The battery liquid cooling unit heating system based on electromagnetic induction according to claim 1, characterized in that: A pressure balancing expansion tank (15) is also provided on the liquid cooling pipe.

5. The battery liquid cooling unit heating system based on electromagnetic induction according to claim 1, characterized in that: The heat exchanger (4) is a plate heat exchanger, and the liquid cooling pipe is connected to the heat exchange pipe through the plate heat exchanger. The heat exchange pipe is a condensing heat exchange pipe, which is provided with a condenser (21), a compressor (22) and an electronic expansion valve (23).

6. A battery liquid cooling unit heating system based on electromagnetic induction according to any one of claims 1 to 5, characterized in that: The ZVS driving module (100) is provided with a zero voltage switching circuit, comprising an oscillating capacitor and an oscillating inductor connected to form an LC oscillation circuit through two MOS tubes, the two MOS tubes being connected in parallel between a power supply and the oscillating capacitor and the oscillating inductor, and each of the two MOS tubes being connected to a group of fast recovery diodes to achieve alternating switching, and each of the MOS tubes being respectively configured with a pull-down resistor, a current limiting resistor and a voltage stabilizing diode.

7. The battery liquid cooling unit heating system based on electromagnetic induction according to claim 6, characterized in that: It also includes an MCU module (300), which is electrically connected to the ZVS drive module (100) and drives the ZVS drive module to control the induction heating coil (11) according to a control signal from a host computer.

8. The battery liquid cooling unit heating system based on electromagnetic induction according to claim 7, characterized in that: The MCU module (300) is electrically connected to the ZVS driving module (100) via the isolation module (400).

9. The battery liquid cooling unit heating system based on electromagnetic induction according to claim 8, characterized in that: The liquid cooling pipe is also provided with a temperature sensor for detecting the temperature of the liquid medium in the pipe, and the temperature sensor is communicatively connected to the MCU module (300) via the filtering and amplifying module (700) and the digital-to-analog conversion module (600) in sequence.

10. The battery liquid cooling unit heating system based on electromagnetic induction according to claim 9, characterized in that: The temperature sensor comprises a water outlet temperature sensor (13) provided at the heating water outlet end of the induction heating coil (11) of the liquid cooling pipe, and a water return temperature sensor (14) provided at the water return end of the battery liquid cooling plate (3).

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