WO2023185964A1

WO2023185964A1 - Battery system and temperature control method for battery system

Info

Publication number: WO2023185964A1
Application number: PCT/CN2023/084880
Authority: WO
Inventors: 李航飞; 宋石磊; 张昊
Original assignee: 华为技术有限公司
Priority date: 2022-03-31
Filing date: 2023-03-29
Publication date: 2023-10-05
Also published as: CN116936972A

Abstract

Provided in the present application are a battery system and a temperature control method for a battery system. The battery system comprises a battery module and a drive control circuit, wherein the battery module comprises a coupling coil and a battery which has a metal structure; the coupling coil is arranged at a side of the battery; and the drive control circuit is connected to the coupling coil and a power source. Here, the drive control circuit is used for converting direct-current electric energy which is provided by the power source into alternating-current electric energy when the temperature of the battery is less than or equal to a first temperature threshold value, and inputting an alternating current into the coupling coil, so that the coupling coil generates an alternating magnetic field to heat the battery. By means of the present application, when the temperature of a battery is too low, an alternating current is inputted into a coupling coil by means of a drive control circuit to generate an alternating magnetic field in a battery, so as to directly heat the battery, thereby reducing energy loss, improving the operation efficiency of the battery, and reducing the temperature control cost.

Description

Battery system and temperature control method of battery system

This application claims priority to the Chinese patent application filed with the China Patent Office on March 31, 2022, with application number 202210328701.2 and the application name "Battery System and Temperature Control Method for Battery System", the entire content of which is incorporated herein by reference. Applying.

Technical field

The present application relates to the field of power electronics technology, and in particular, to a battery system and a temperature control method of the battery system.

Background technique

In the field of power electronics technology, the batteries in many electrical devices (such as mobile phones, smart watches or other mobile terminals) need to use the electrochemical reactions inside the battery to provide electrical energy for the electrical devices. The voltage of the battery is related to the temperature of the battery. related. When the temperature of the battery decreases, the potential of the positive electrode of the battery will decrease and the potential of the negative electrode will increase, causing the output voltage of the battery to decrease. At the same time, as the temperature of the battery decreases, the ion conduction speed inside the battery slows down, causing the internal resistance of the battery to increase, which will further reduce the output voltage of the battery. Therefore, when the temperature of the battery in the electrical equipment is too low, the battery needs to be heated to increase the output voltage of the battery and maintain the battery's normal power supply for the electrical equipment. During the course of research and practice, the inventor of this application discovered that in the prior art, it is necessary to generate heat energy through a heating layer (for example, a resistance wire) and transfer the heat energy to the battery through a thermal conductive layer to increase the temperature of the battery. This method mainly conducts heat conduction between the heating layer and the battery through the thermal conductive layer, which is an indirect heating of the battery. The heat energy loss is large and the heating efficiency is low.

Contents of the invention

This application provides a battery system and a temperature control method for the battery system. When the temperature of the battery is too low, an alternating current is input to the coupling coil through the drive control circuit, and an alternating magnetic field is generated inside the battery, thereby directly controlling the battery. Heating, reducing energy loss, improving battery efficiency, and reducing temperature control costs.

In a first aspect, this application provides a battery system, which includes a battery module and a drive control circuit. Here, the battery module may include a coupling coil and a battery with a metal structure. The coupling coil may be disposed on one side of the battery, and the drive control circuit connects the coupling coil and the power source. The power supply here can be a power supply module other than the battery in the battery system that can provide power, or it can be a battery in the battery system, or it can be a circuit that uses the battery in the battery system to provide power. The drive control circuit here is used to convert the DC power provided by the power supply into AC power when the temperature of the battery is less than or equal to the first temperature threshold, and input the alternating current to the coupling coil to cause the coupling coil to generate an alternating magnetic field. Battery heating.

In the embodiments provided in this application, the battery module may include a coupling coil and a battery with a metal structure (for example, a battery with a metal structure inside, or a battery with a metal shell outside, etc., which can produce eddy current effects under an alternating magnetic field. battery). Here, the drive control circuit can input alternating current to the coupling coil when the temperature of the battery is too low, so that the coupling coil generates an alternating magnetic field. The alternating magnetic field generated by the coupling coil passes through the inside of the battery, causing the battery to produce an eddy current effect, thereby achieving The effect of heating the battery.

In this application, the drive control circuit can input alternating current to the coupling coil to generate an alternating magnetic field when the temperature is too low, so that the battery generates an eddy current effect through the alternating magnetic field, thereby heating the battery and reducing the transfer of heat energy to the battery. Reduce energy loss, improve battery efficiency, and reduce temperature control costs.

In conjunction with the first aspect, in a first possible implementation, the battery module may provide contacts for connecting to the coupling coil, and the drive control circuit connects to the coupling coil through the contacts. Using this application, the coupling coil and the battery can be arranged as a battery module, And the coupling coil in the battery module is connected to the circuit outside the battery module (for example, the drive control circuit) through the contacts. Here, the coupling coil can be an original coupling coil in the battery module for reuse (for example, the receiving coil in the wireless power supply process is reused as a coupling coil), or it can be a coupling coil that does not originally exist in the battery module. In this application, the connection relationship of the battery modules is simple, the layout method is convenient, there is no need to make too many changes to the original batteries or battery modules in the battery system, and the adaptability is strong.

With reference to the first possible implementation of the first aspect, in a second possible implementation, the drive control circuit may include an inverter circuit and a control circuit. The inverter circuit may be connected to the control circuit and the coupling coil, and the inverter circuit may be connected to power supply. The control circuit here can be used to control the inverter circuit to convert the DC power output by the power supply into alternating power when the temperature of the battery is less than or equal to the first temperature threshold, and input alternating current to the coupling coil based on the alternating power. Here, the power supply may be a power supply module in the battery system that can provide power other than the battery, or it may be a battery in the battery system, or it may be a circuit that uses the battery in the battery system to provide power. Here, the inverter circuit may be a full-bridge inverter circuit, a half-bridge inverter circuit, or other circuits that can convert DC power into AC power. Here, the control circuit may be a switch tube, or other circuit that can control the on/off of the circuit. Using this application, the control circuit can convert DC power into alternating power through the inverter circuit, and input the alternating current to the coupling coil. The circuit structure is simple, the operation method is convenient, and the adaptability is strong.

With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner, the driving control circuit may include a micro control unit and a driving circuit, and the driving circuit may connect the micro control unit and the coupling coil, and the micro control unit and the driving circuit may The circuit can be connected to a power source. The microcontrol unit here can be used to input a drive control signal to the drive circuit when the temperature of the battery is less than or equal to the first temperature threshold. The drive circuit here can be used to convert the DC power output from the power supply into alternating power based on the drive control signal, and input the alternating current to the coupling coil based on the alternating power. Here, the power supply may be a power supply module in the battery system that can provide power other than the battery, or it may be a battery in the battery system, or it may be a circuit that uses the battery in the battery system to provide power. Here, the micro control unit may be an MCU, or other control unit that can generate drive control signals. The drive circuit may be a circuit that amplifies the amplitude of the drive control signal based on the drive control signal, and inputs the amplified drive control signal to the coupling coil as an alternating current (for example, a chip integrated with a drive function). Here, the drive circuit can also be other circuits that can convert the DC power output from the power supply into AC power based on the drive control signal and input the alternating current to the coupling coil. Using this application, the drive circuit can convert DC power into alternating power based on the drive control signal, and input the alternating current to the coupling coil. The circuit structure is simple, the operation method is convenient, and the adaptability is strong.

In combination with the second possible implementation manner or the third possible implementation manner of the first aspect, in a fourth possible implementation manner, the drive control circuit may also be used to continuously couple to the battery when the temperature of the battery is less than the second temperature threshold. The coil inputs alternating current. Here, the second temperature threshold is greater than the first temperature threshold. The drive control circuit here can also be used to stop inputting alternating current to the coupling coil when the temperature of the battery is greater than or equal to the second temperature threshold. Here, the second temperature threshold may be a protection temperature value of the battery. When the temperature of the battery exceeds this temperature, the normal power supply of the battery may be affected or the battery system may be affected. Using this application, the drive control circuit can stop inputting AC power to the coupling coil when the battery temperature is too high, thereby preventing the battery temperature from being too high and enhancing the safety of the battery system. The control method is simple and has strong adaptability.

In conjunction with the first aspect or the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the drive control circuit may further include a transformer circuit, and the transformer circuit may be connected to the inverter circuit of the drive control circuit, or The transformer circuit can be connected to a drive circuit that drives the control circuit. The transformer circuit here can be used to input a control voltage whose amplitude is raised from the first control voltage value to the second control voltage value to the inverter circuit or the drive circuit when the temperature of the battery is less than the third temperature threshold, so as to increase the inverter voltage. The alternating current input from the circuit or drive circuit to the coupling coil. Here, the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold, and the second control voltage value is greater than the first control voltage value. Here, the third temperature threshold may be the rated temperature at which the battery operates, or the temperature at which the battery operates most efficiently, or the temperature at which the battery output power is maximum, or other temperatures (or temperature ranges) that are most suitable for battery operation. When the temperature of the battery is less than the third temperature threshold, the temperature of the battery The degree is still relatively low. The transformer circuit can input a control voltage whose amplitude is raised from the first control voltage value to the second control voltage value to the inverter circuit or the drive circuit, so as to increase the input voltage of the inverter circuit or the drive circuit to the coupling coil. The voltage amplitude corresponding to the alternating current is used to increase the alternating magnetic field generated by the coupling coil, thereby increasing the eddy current effect generated by the battery and speeding up the heating of the battery. Here, the first control voltage may be a voltage value of the control voltage input by the transformer circuit to the inverter circuit when the temperature of the detected battery is detected. Using this application, the working efficiency of the battery system can be further improved, the circuit structure is simple, the control method is flexible, and the adaptability is strong.

With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the transformer circuit may also be used to convert the voltage to the inverter when the temperature of the battery is greater than or equal to the third temperature threshold and less than the second temperature threshold. The circuit or drive circuit inputs a control voltage whose amplitude is reduced from the third control voltage value to the fourth control voltage value to reduce the alternating current input by the inverter circuit or the drive circuit to the coupling coil. Here, the fourth control voltage value is smaller than the third control voltage value. Here, when the temperature of the battery is greater than or equal to the third temperature threshold, the temperature of the battery is relatively high, and the transformer circuit can input the amplitude to the inverter circuit or the drive circuit from the third control voltage value to the fourth control voltage value. The voltage is used to reduce the voltage amplitude corresponding to the alternating current input by the inverter circuit or drive circuit to the coupling coil, so as to reduce the alternating magnetic field generated by the coupling coil, thereby reducing the eddy current effect generated by the battery and lowering the temperature of the battery. Here, the third control voltage may be a voltage value of the control voltage input by the transformer circuit to the inverter circuit when the temperature of the detected battery is detected, and the third control voltage may be equal to the first control voltage. Using this application, the working efficiency of the battery system can be further improved, the circuit structure is simple, the control method is flexible, and the adaptability is strong.

With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the drive control circuit can also be used to stop supplying the coupling coil with the alternating current when the duration of the input alternating current to the coupling coil is greater than or equal to the temperature rise duration threshold. An alternating current is input to prevent the battery from heating up for an extended period of time. Here, the temperature-raising duration threshold may be the longest heating time of the battery (that is, the longest time the alternating current is continuously input to the coupling coil). When the heating time of the battery exceeds this time, it may affect the normal power supply of the battery or affect the battery system. Using this application, the drive control circuit can stop inputting alternating current to the coupling coil when the battery is heated for too long, thus enhancing the safety of the battery system. The control method is simple and adaptable.

Combined with any possible implementation manner of the first aspect, in an eighth possible implementation manner, the drive control circuit may further include a frequency conversion circuit, and the frequency conversion circuit may be connected to the inverter circuit of the drive control circuit, or the frequency conversion circuit may be connected to the drive control circuit. Microcontroller unit for the circuit. The frequency conversion circuit here can be used to control the frequency of the alternating current input by the inverter circuit to the coupling coil to be the resonant frequency of the battery system, or by controlling the drive control signal input by the micro control unit to the drive circuit to control the drive circuit input to the coupling coil. The frequency of the alternating current is the resonant frequency to improve the battery heating efficiency. Here, the resonant frequency of the battery system may be the rated frequency at which the load connected to the battery system operates, or the frequency at which the load connected to the battery system operates with the highest efficiency, or other frequencies (or frequency ranges) suitable for the load connected to the battery system to operate. When the frequency of the alternating current input by the drive control circuit to the coupling coil is the resonant frequency of the battery system, the heating efficiency for the battery is the highest. It can be understood that in some cases, the temperature of the battery in the battery system should not change (for example, heating or cooling) too fast, so the drive control circuit can also input an alternating current with a frequency smaller than or larger than the resonant frequency to the coupling coil, so as to Controls the rate at which the temperature of the battery in the battery system changes (eg, heats up or cools down). Using this application, the drive control circuit can change the frequency of the alternating current input to the coupling coil, improve the heating efficiency of the battery, or control the speed of battery temperature change, improving the safety of the system. The control method is flexible and simple, and has strong adaptability.

Combined with any possible implementation of the first aspect, in a ninth possible implementation, the drive control circuit may further include a temperature detection circuit. The first end of the temperature detection circuit and the battery may be connected to the detection point. The temperature detection circuit The second end of the temperature detection circuit can be connected to the control circuit of the driving control circuit, or the second end of the temperature detection circuit can be connected to the micro control unit of the driving control circuit. The temperature detection circuit here can be used to obtain the temperature of the battery based on the detection voltage at the detection point. Using this application, Wen The temperature detection circuit can obtain the temperature of the battery in real time or at the detection moment, and transmit the temperature of the battery to the drive control circuit. The control method is flexible, simple and highly adaptable.

In combination with the first aspect or any possible implementation of the first aspect, in a tenth possible implementation, the battery module may further include at least one set of magnetic shielding cases. The coupling coil here can be arranged on one side of the battery, at least one set of magnetic shielding shells can be arranged around the battery and the coupling coil, and the arrangement direction of a set of magnetic shielding shells in the at least one set of magnetic shielding shells can be consistent with the arrangement of the coupling coil. The direction is parallel. Here, the magnetic shielding shell can prevent the alternating magnetic field generated by the coupling coil from spreading to the outside of the battery module and affecting other components outside the battery module, thereby improving the safety of the system. It is also simple in structure and highly adaptable.

With reference to the tenth possible implementation manner of the first aspect, in an eleventh possible implementation manner, the battery module may include at least two sets of magnetic shielding shells, and the at least two sets of magnetic shielding shells may be arranged between the battery and the coupling coil. On the periphery, the arrangement direction of one set of magnetic shielding shells in at least two sets of magnetic shielding shells can be parallel to the arrangement direction of the coupling coil, and the arrangement direction of the other set of magnetic shielding shells in at least two sets of magnetic shielding shells can be parallel to the arrangement direction of the coupling coil. The direction is vertical. Here, the magnetic shielding shell can prevent the alternating magnetic field generated by the coupling coil from spreading outside the battery module and affecting other components outside the battery module, improving the safety of the system and having a stronger shielding effect on the magnetic field.

In combination with the tenth possible implementation manner or the eleventh possible implementation manner of the first aspect, in a twelfth possible implementation manner, the material of the magnetic shielding shell can be a metal shielding material, nanocrystals or other conductor materials, The selection of magnetic shielding shells is flexible and diverse, with high adaptability.

In a second aspect, this application provides a temperature control method for a battery system. The temperature control method can be applied to the battery system in the first aspect or any possible implementation of the first aspect. The method includes: a drive control circuit Get the temperature of the battery. When the temperature of the battery is less than or equal to the first temperature threshold, the drive control circuit converts the DC power provided by the power supply into AC power, and inputs alternating current to the coupling coil to cause the coupling coil to generate an alternating magnetic field to heat the battery.

In conjunction with the second aspect, in a first possible implementation, after the drive control circuit inputs the alternating current to the coupling coil, the method may further include: when the temperature of the battery is less than the second temperature threshold, the drive control circuit continues to The coil inputs alternating current. Here, the second temperature threshold is greater than the first temperature threshold. When the temperature of the battery is greater than or equal to the second temperature threshold, the drive control circuit stops inputting alternating current to the coupling coil. Here, the second temperature threshold may be a protection temperature value of the battery. When the temperature of the battery exceeds this temperature, the normal power supply of the battery may be affected or the battery system may be affected. Using this application, the drive control circuit can stop inputting AC power to the coupling coil when the battery temperature is too high, thereby preventing the battery temperature from being too high and enhancing the safety of the battery system. The control method is simple and has strong adaptability.

With reference to the first possible implementation of the second aspect, in the second possible implementation, when the temperature of the battery is less than the second temperature threshold, the drive control circuit continues to input alternating current to the coupling coil, which may include: when the battery When the temperature is less than the third temperature threshold, the transformer circuit inputs a control voltage whose amplitude is increased from the first control voltage value to the second control voltage value to the inverter circuit or the drive circuit, so as to increase the coupling of the inverter circuit or the drive circuit to Alternating current input to the coil. Here, the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold, and the second control voltage value is greater than the first control voltage value. Here, the third temperature threshold may be the rated temperature at which the battery operates, or the temperature at which the battery operates most efficiently, or The temperature at which the output power is maximum, or other temperatures (or temperature ranges) that are most suitable for battery operation. When the temperature of the battery is less than the third temperature threshold and the temperature of the battery is still relatively low, the transformer circuit can input a control voltage whose amplitude is increased from the first control voltage value to the second control voltage value to the inverter circuit or the drive circuit, so as to Increase the voltage amplitude corresponding to the alternating current input from the inverter circuit or drive circuit to the coupling coil to increase the alternating magnetic field generated by the coupling coil, thereby increasing the eddy current effect generated by the battery and speeding up the heating of the battery. Here, the first control voltage may be a voltage value of the control voltage input by the transformer circuit to the inverter circuit when the temperature of the detected battery is detected. Using this application, the working efficiency of the battery system can be further improved, the circuit structure is simple, the control method is flexible, and the adaptability is strong.

With reference to the second possible implementation of the second aspect, in a third possible implementation, when the temperature of the battery is less than the second temperature threshold, the drive control circuit continues to input alternating current to the coupling coil, which may include: when the battery When the temperature is greater than or equal to the third temperature threshold and less than the second temperature threshold, the transformer circuit inputs a control voltage whose amplitude is reduced from the third control voltage value to the fourth control voltage value to the inverter circuit or the drive circuit to reduce The alternating current input from the inverter circuit or drive circuit to the coupling coil. Here, the fourth control voltage value is smaller than the third control voltage value. Here, when the temperature of the battery is greater than or equal to the third temperature threshold, the temperature of the battery is relatively high, and the transformer circuit can input the amplitude to the inverter circuit or the drive circuit from the third control voltage value to the fourth control voltage value. The voltage is used to reduce the voltage amplitude corresponding to the alternating current input by the inverter circuit or drive circuit to the coupling coil, so as to reduce the alternating magnetic field generated by the coupling coil, thereby reducing the eddy current effect generated by the battery and lowering the temperature of the battery. Here, the third control voltage may be a voltage value of the control voltage input by the transformer circuit to the inverter circuit when the temperature of the detected battery is detected, and the third control voltage may be equal to the first control voltage. Using this application, the working efficiency of the battery system can be further improved, the circuit structure is simple, the control method is flexible, and the adaptability is strong.

In combination with any possible implementation manner of the second aspect or the third aspect, in a fourth possible implementation manner, after the driving control circuit inputs the alternating current to the coupling coil, the method may further include: when the alternating current is input to the coupling coil, When the duration of the variable current is greater than or equal to the heating duration threshold, the drive control circuit stops inputting the alternating current to the coupling coil to prevent the battery from being heated for too long. Here, the temperature-raising duration threshold may be the longest heating time of the battery (that is, the longest time the alternating current is continuously input to the coupling coil). When the heating time of the battery exceeds this time, it may affect the normal power supply of the battery or affect the battery system. Using this application, the drive control circuit can stop inputting alternating current to the coupling coil when the battery is heated for too long, thus enhancing the safety of the battery system. The control method is simple and adaptable.

Description of drawings

Figure 1 is a schematic diagram of the application scenario of the battery system provided by the embodiment of the present application;

Figure 2 is a schematic structural diagram of a battery module provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of a battery system provided by an embodiment of the present application;

Figure 4 is another structural schematic diagram of the battery system provided by the embodiment of the present application;

Figure 5 is another structural schematic diagram of the battery system provided by the embodiment of the present application;

Figure 6 is another structural schematic diagram of the battery system provided by the embodiment of the present application;

Figure 7 is another structural schematic diagram of the battery system provided by the embodiment of the present application;

Figure 8 is another structural schematic diagram of the battery system provided by the embodiment of the present application;

Figure 9 is another structural schematic diagram of the battery system provided by the embodiment of the present application;

Figure 10 is a schematic flow chart of the temperature control method provided by the embodiment of the present application;

Figure 11 is another schematic flow chart of the temperature control method provided by the embodiment of the present application.

Detailed ways

The battery system provided by this application can use the coupling coil in the battery module to generate an alternating magnetic field and heat the battery through the eddy current effect. The battery system can be applied to pure energy storage fields (such as mobile terminals (such as smart watches, smart phones) )), new energy smart microgrid field, power transmission and distribution field or new energy field (such as photovoltaic grid-connected field or wind power grid-connected field), photovoltaic storage power generation field (such as power supply for household equipment (such as refrigerators, air conditioners) or grid) , or the field of wind storage power generation, or the field of high-power converters (such as converting direct current into high-power high-voltage alternating current) and other application fields. The details can be determined according to the actual application scenario, and are not limited here. The battery system provided by this application can be adapted to different application scenarios, such as the application scenario of heating batteries in a light storage power supply environment, the application scenario of heating batteries in a wind storage power supply environment, and the application scenario of heating batteries in a pure energy storage power supply environment. The application scenario of heating batteries in a pure energy storage power supply environment or other application scenarios will be described below as an example, and will not be described in detail below.

Please also refer to Figure 1 , which is a schematic diagram of an application scenario of the battery system provided by an embodiment of the present application. In a pure energy storage power supply application scenario, as shown in Figure 1, the battery system 2 includes a drive control circuit and a battery module, where the battery module includes a coupling coil (for example, a planar coupling coil a or a three-dimensional coupling coil a). Coil b or other types of coupling coils (for convenience of description, this application only uses planar coupling coil a as the coupling coil, which will not be described again) and batteries with metal structures (for example, batteries with metal structures inside, or Batteries with metal casings on the outside, such as batteries that can produce eddy current effects under alternating magnetic fields). The coupling coil here can be arranged on one side of the battery, and the coupling coil and the battery can be wrapped with a magnetic shielding shell. Here, the drive control circuit may connect the power supply 1 and the coupling coil (for example, coupling coil a or coupling coil b). Here, the power supply 1 can be a power supply module in the battery system that can provide power other than the battery, or it can be a battery in the battery system (as shown by the dotted line connecting the drive control circuit and the battery in Figure 1), or it can be used. A circuit powered by batteries in a battery system. Here, the battery can be connected directly or through a transformer circuit to the load 3. When the battery system supplies power to load 3, the drive control circuit can obtain the temperature of the battery, and when the temperature of the battery is less than or equal to the first temperature threshold, input alternating current to the coupling coil to cause the coupling coil to generate an alternating magnetic field. , to heat the battery. The battery system provided by this application is suitable for powering mobile terminals (such as smart watches, smart phones), powering base station equipment in remote areas where there is no mains power or poor mains power, or powering storage batteries (such as vehicle batteries), or In the application scenarios of power supply for various types of electrical equipment such as household equipment (such as refrigerators, air conditioners, etc.), the details can be determined according to the actual application scenario, and are not limited here. It can be further understood that load 3 in Figure 1 can be a mobile terminal (such as a smart watch (not shown in the figure), a smart phone (that is, load a), a computer (that is, load b)), a power grid (in the figure (not shown in the figure), batteries (not shown in the figure), electrical equipment of the building (not shown in the figure), household electrical equipment (such as a refrigerator (ie, load c)) or other electrical equipment. The power grid here may include power consuming equipment or power transmission equipment such as transmission lines, power transfer sites, batteries, communication base stations, or household equipment. In the application scenario shown in Figure 1, when the battery temperature in battery system 2 is too low, the battery needs to be heated to increase the output voltage of the battery and maintain the battery's normal power supply for electrical equipment (such as load 3).

Using the implementation provided by this application, when the temperature of the battery is too low, the alternating current can be input to the coupling coil through the drive control circuit, thereby generating an alternating magnetic field inside the battery, thereby directly heating the battery, reducing energy loss, and improving battery performance. Improve work efficiency and reduce temperature control costs.

The battery system, battery module and working principle provided by this application will be illustrated below with reference to Figures 2 to 9.

Please refer to Figure 2. Figure 2 is a schematic structural diagram of a battery module provided by an embodiment of the present application. As shown in Figure 2, battery module a includes a battery with a metal structure (for example, a battery with an internal metal structure, or a battery with an external metal shell, etc. that can produce eddy current effects under an alternating magnetic field), a coupling coil and at least one set of magnetic shielding shells. The coupling coil here can be disposed on one side of the battery (for example, disposed in parallel to one side of the battery). At least one set of magnetic shielding shells can be disposed around the periphery of the battery and the coupling coil. The arrangement direction of the shielding shell may be parallel to the arrangement direction of the coupling coil. Here, the magnetic shielding shell can prevent the alternating magnetic field generated by the coupling coil from spreading to the outside of the battery module and causing negative effects on the battery. Other components other than the module have an impact and improve the security of the system. At the same time, the structure is simple and the adaptability is strong.

Please refer to Figure 2 again. The battery module b can include at least two sets of magnetic shielding shells. At least two sets of magnetic shielding shells can be arranged around the battery and the coupling coil. The arrangement of one set of magnetic shielding shells in the at least two sets of magnetic shielding shells. The direction may be parallel to the arrangement direction of the coupling coil, and the arrangement direction of the other set of the at least two sets of magnetic shield shells may be perpendicular to the arrangement direction of the coupling coil. It can be understood that the magnetic shielding shells can also be arranged in three or more groups according to the shape of the battery module to prevent the alternating magnetic field generated by the coupling coil from spreading outside the battery module. Here, the magnetic shielding shell can prevent the alternating magnetic field generated by the coupling coil from spreading outside the battery module and affecting other components outside the battery module, improving the safety of the system and having a stronger shielding effect on the magnetic field.

Here, the magnetic shielding shell can be made of metal shielding material, nanocrystals or other conductive materials. This application does not place any restrictions on the material of the magnetic shielding shell.

Please refer to Figure 2 again. The battery module in Figure 2 (for example, battery module a or battery module b) can provide contacts for connecting the coupling coil, and the drive control circuit can connect the coupling coil through the contacts. Here, the battery module can also be connected to a circuit outside the battery module through contacts. Using this application, the coupling coil and the battery can be arranged into a battery module, and the coupling coil in the battery module is connected to a circuit (for example, a drive control circuit) outside the battery module through contacts. Here, the coupling coil can be the original coupling coil in the battery module for reuse (for example, the receiving coil in the wireless power supply process is reused as a coupling coil. The coil can also be connected to the switch control module. The switch control module can be used when When the coil is used as a coupling coil in the temperature control process, the connection between the coil and the drive control circuit is turned on, and the coil and the receiving circuit are disconnected (for example, a circuit that converts the alternating electric energy received by the receiving coil into direct current electric energy during the wireless power supply process) connection; the switch control module can also be used to turn on the coil and the receiving circuit when the coil is used as a receiving coil in the wireless power supply process (for example, a circuit that converts the alternating electric energy received by the receiving coil in the wireless power supply process into DC electric energy) connection, and disconnect the coil and the drive control circuit), or it can be a coupling coil that does not originally exist in the battery module. In this application, the connection relationship of the battery modules is simple, the layout method is convenient, there is no need to make too many changes to the original batteries or battery modules in the battery system, and the adaptability is strong.

It can be understood that the type of coupling coil, the arrangement or connection between the coupling coil and the battery, the connection between the coupling coil and the external circuit of the battery module, and the arrangement of the magnetic shielding shell provided in this application are only for illustrative purposes. Other types of coupling coils, or other arrangements or connections between coupling coils and batteries, connections between coupling coils and battery module external circuits, or other arrangements of magnetic shielding shells, all fall within the protection scope of this application, as follows: No longer.

Please also refer to FIG. 3 , which is a schematic structural diagram of a battery system provided by an embodiment of the present application. In some feasible implementations, as shown in FIG. 3 , the drive control circuit may include an inverter circuit and a control circuit. The inverter circuit may be connected to the control circuit and the coupling coil, and the inverter circuit may be connected to the power supply. The control circuit here can be used to control the inverter circuit to convert the DC power output by the power supply into alternating power when the temperature of the battery is less than or equal to the first temperature threshold, and input alternating current to the coupling coil based on the alternating power. Here, the power supply may be a power supply module in the battery system that can provide power other than the battery, or it may be a battery in the battery system, or it may be a circuit that uses the battery in the battery system to provide power. Here, the inverter circuit may be a full-bridge inverter circuit, a half-bridge inverter circuit, or other circuits that can convert DC power into AC power. Here, the control circuit may be a switch tube, or other circuit that can control the on/off of the circuit. Using this application, the control circuit can convert DC power into alternating power through the inverter circuit, and input the alternating current to the coupling coil. The circuit structure is simple, the operation method is convenient, and the adaptability is strong.

Please refer to FIG. 4 , which is another schematic structural diagram of a battery system provided by an embodiment of the present application. As shown in Figure 4, the drive control circuit may include a micro control unit and a drive circuit, the drive circuit may be connected to the micro control unit and the coupling coil, and the micro control unit and the drive circuit may be connected to a power supply. Here the micro control unit can be used when the battery temperature is less than or equal to the first temperature threshold When the value is reached, the drive control signal is input to the drive circuit. The drive circuit here can be used to convert the DC power output from the power supply into alternating power based on the drive control signal, and input the alternating current to the coupling coil based on the alternating power. Here, the power supply may be a power supply module in the battery system that can provide power other than the battery, or it may be a battery in the battery system, or it may be a circuit that uses the battery in the battery system to provide power.

It can be understood that the micro control unit may be an MCU, or other control unit that may generate drive control signals (eg, enable signals and/or PWM signals). The driving circuit may amplify the amplitude of the driving control signal (for example, the enable signal and/or the PWM signal) based on the driving control signal (here, the power connection driving circuit may provide a basic operating voltage for the driving circuit), and amplify the amplified The drive control signal is input as an alternating current to the circuit of the coupling coil (for example, a chip with integrated drive function). It can be further understood that the driving circuit can also be other circuits that can convert the DC power output by the power supply into AC power based on the driving control signal (for example, the enable signal and/or the PWM signal) and input the alternating current to the coupling coil.

Using this application, the drive circuit can convert DC power into alternating power based on the drive control signal, and input the alternating current to the coupling coil. The circuit structure is simple, the operation method is convenient, and the adaptability is strong.

It can be understood that Figures 3 and 4 are only two implementations of the drive control circuit provided by this application, and are only illustrative explanations of the working principle of the drive control circuit. For convenience of presentation, the following will mainly use the diagram shown in Figure 4 The battery system provided by this application is introduced by taking the drive control circuit as an example. However, other types of drive control circuits are within the scope of this application and will not be described in detail below.

In some feasible implementations, after the drive control circuit inputs the alternating current to the coupling coil, the drive control circuit may also be configured to continue to input the alternating current to the coupling coil when the temperature of the battery is less than the second temperature threshold. Here, the second temperature threshold is greater than the first temperature threshold. The drive control circuit here can also be used to stop inputting alternating current to the coupling coil when the temperature of the battery is greater than or equal to the second temperature threshold. Here, the second temperature threshold may be a protection temperature value of the battery. When the temperature of the battery exceeds this temperature, the normal power supply of the battery may be affected or the battery system may be affected. Using this application, the drive control circuit can stop inputting AC power to the coupling coil when the battery temperature is too high, thereby preventing the battery temperature from being too high and enhancing the safety of the battery system. The control method is simple and has strong adaptability.

In some feasible implementations, the drive control circuit can also be used to stop inputting the alternating current to the coupling coil when the duration of the alternating current input to the coupling coil is greater than or equal to the temperature rise duration threshold to prevent the battery from being heated for too long. long. Here, the temperature-raising duration threshold may be the longest heating time of the battery (that is, the longest time the alternating current is continuously input to the coupling coil). When the heating time of the battery exceeds this time, it may affect the normal power supply of the battery or affect the battery system. Using this application, the drive control circuit can stop inputting alternating current to the coupling coil when the battery is heated for too long, thus enhancing the safety of the battery system. The control method is simple and adaptable.

In some feasible implementations, the battery system may also include a temperature detection circuit. Please refer to FIG. 5 , which is another schematic structural diagram of a battery system provided by an embodiment of the present application. As shown in Figure 5, the first end of the temperature detection circuit and the battery can be connected to the detection point, and the second end of the temperature detection circuit can be connected to the control circuit of the driving control circuit (not shown in the figure), or the third end of the temperature detection circuit. The two ends can be connected to the micro control unit of the drive control circuit. The temperature detection circuit here can be used to obtain the temperature of the battery based on the detection voltage at the detection point. Using this application, the temperature detection circuit can obtain the temperature of the battery in real time or at the detection moment, and transmit the temperature of the battery to the drive control circuit. The control method is flexible, simple and highly adaptable.

In some feasible implementations, the drive control circuit may also include a transformer circuit. Please also refer to FIG. 6 , which is another structural schematic diagram of a battery system provided by an embodiment of the present application. As shown in FIG. 6 , the transformer circuit may be connected to an inverter circuit (not shown in the figure) that drives the control circuit, or the transformer circuit may be connected to a drive circuit that drives the control circuit. The transformer circuit here can be used to input a control voltage whose amplitude is raised from the first control voltage value to the second control voltage value to the inverter circuit or the drive circuit when the temperature of the battery is less than the third temperature threshold, so as to increase the inverter voltage. circuit or drive circuit input to the coupling coil alternating current. Here, the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold, and the second control voltage value is greater than the first control voltage value. Here, the third temperature threshold may be the rated temperature at which the battery operates, or the temperature at which the battery operates most efficiently, or the temperature at which the battery output power is maximum, or other temperatures (or temperature ranges) that are most suitable for battery operation. When the temperature of the battery is less than the third temperature threshold and the temperature of the battery is still relatively low, the transformer circuit can input a control voltage whose amplitude is increased from the first control voltage value to the second control voltage value to the inverter circuit or the drive circuit, so as to Increase the voltage amplitude corresponding to the alternating current input from the inverter circuit or drive circuit to the coupling coil to increase the alternating magnetic field generated by the coupling coil, thereby increasing the eddy current effect generated by the battery and speeding up the heating of the battery. Here, the first control voltage may be a voltage value of the control voltage input by the transformer circuit to the inverter circuit when the temperature of the detected battery is detected. Using this application, the working efficiency of the battery system can be further improved, the circuit structure is simple, the control method is flexible, and the adaptability is strong.

In some feasible implementations, the transformer circuit can also be used to reduce the input amplitude to the inverter circuit or the drive circuit by the third control voltage value when the temperature of the battery is greater than or equal to the third temperature threshold and less than the second temperature threshold. The control voltage reaches the fourth control voltage value to reduce the alternating current input by the inverter circuit or the drive circuit to the coupling coil. Here, the fourth control voltage value is smaller than the third control voltage value. Here, when the temperature of the battery is greater than or equal to the third temperature threshold, the temperature of the battery is relatively high, and the transformer circuit can input the amplitude to the inverter circuit or the drive circuit from the third control voltage value to the fourth control voltage value. The voltage is used to reduce the voltage amplitude corresponding to the alternating current input by the inverter circuit or drive circuit to the coupling coil, so as to reduce the alternating magnetic field generated by the coupling coil, thereby reducing the eddy current effect generated by the battery and lowering the temperature of the battery. Here, the third control voltage may be a voltage value of the control voltage input by the transformer circuit to the inverter circuit when the temperature of the detected battery is detected, and the third control voltage may be equal to the first control voltage. Using this application, the working efficiency of the battery system can be further improved, the circuit structure is simple, the control method is flexible, and the adaptability is strong.

In some feasible implementations, the battery system may also include a frequency conversion circuit. Please also refer to FIG. 7 , which is another structural schematic diagram of a battery system provided by an embodiment of the present application. As shown in Figure 7, the frequency conversion circuit may be connected to the inverter circuit of the drive control circuit (not shown in the figure), or the frequency conversion circuit may be connected to the micro control unit of the drive control circuit. The frequency conversion circuit here can be used to control the frequency of the alternating current input by the inverter circuit to the coupling coil to be the resonant frequency of the battery system, or by controlling the drive control signal input by the micro control unit to the drive circuit to control the drive circuit input to the coupling coil. The frequency of the alternating current is the resonant frequency to improve the battery heating efficiency. Here, the resonant frequency of the battery system may be the rated frequency at which the load connected to the battery system operates, or the frequency at which the load connected to the battery system operates with the highest efficiency, or other frequencies (or frequency ranges) suitable for the load connected to the battery system to operate. When the frequency of the alternating current input by the drive control circuit to the coupling coil is the resonant frequency of the battery system, the heating efficiency for the battery is the highest. It can be understood that in some cases, the temperature of the battery in the battery system should not change (for example, heating or cooling) too fast, so the drive control circuit can also input an alternating current with a frequency smaller than or larger than the resonant frequency to the coupling coil, so as to Controls the rate at which the temperature of the battery in the battery system changes (eg, heats up or cools down). Using this application, the drive control circuit can change the frequency of the alternating current input to the coupling coil, improve the heating efficiency of the battery, or control the speed of battery temperature change, improving the safety of the system. The control method is flexible and simple, and has strong adaptability.

In some feasible implementations, the drive control circuit may also include a compensation circuit. Please also refer to FIG. 8 , which is another structural schematic diagram of a battery system provided by an embodiment of the present application. As shown in Figure 8, the inverter circuit in Figure 8 is a full-bridge inverter circuit. The compensation circuit in Figure 8 is composed of a capacitor and an inductor. The compensation circuit is connected between the inverter circuit and the coupling coil. Here, the inverter circuit is connected to the power supply VDD and the control circuit. The inverter circuit can convert the DC power provided by the power supply VDD into AC power and input the alternating current to the coupling coil. The compensation circuit can filter out the clutter current in the alternating current input from the inverter circuit to the coupling coil, thereby enhancing the stability of the system.

Please refer to Figure 8 again, where the temperature detection circuit (for example, an analog-to-digital converter or other temperature measurement circuit) can be integrated with the control circuit (also represented as a control circuit in the figure). Here, the battery module or other circuit used to connect the battery The board can include a thermosensitive resistor RT, or an additional thermosensitive resistor RT. The thermosensitive resistor RT is arranged close to the battery. One end of the thermosensitive resistor RT can be used as a detection point for the battery to connect to the temperature detection circuit (that is, in the figure) The first end of the control circuit), at the same time, one end of the thermosensitive resistor RT is connected to the power supply VDD' through the fixed value resistor R0, and the other end of the thermosensitive resistor is connected to ground. Here, capacitor C0 can be used for filtering. When the temperature of the battery changes, because the resistance of the thermosensitive resistor RT changes, the voltage obtained by connecting the thermosensitive resistor RT and the fixed value resistor R0 in series will also change (that is, the voltage at the detection point will change) , the temperature detection circuit (that is, the control circuit in the figure) can obtain the temperature of the battery in real time or at the detection moment, and transmit the temperature of the battery to the drive control circuit. The control method is flexible, simple, and highly adaptable.

In some feasible implementations, when the drive control circuit includes a micro control unit and a drive circuit, the level of the drive control signal output by the micro control unit (for example, MCU) does not match the working level of the drive circuit, and the drive control The circuit may also include drive level conversion circuitry. Please refer to FIG. 9 , which is another schematic structural diagram of a battery system provided by an embodiment of the present application. As shown in FIG. 9 , a micro control unit (eg, MCU) may generate drive control signals (eg, enable signal and PWM signal) based on the temperature of the battery. Among them, the driving level conversion circuit 1 can convert the level of the enable signal output by the micro control unit to the level of the EN pin of the driving circuit, so that the micro control unit can control the turning on or off of the driving circuit. The driving level conversion circuit 2 can convert the level of the PWM signal output by the micro control unit to the level of the IN pin of the driving circuit (for example, IN1 and IN2), thereby allowing the micro control unit to control the frequency of the driving circuit based on the PWM signal. Output alternating current of corresponding frequency. That is, the microcontrol unit here can control the frequency of the alternating current output by the drive circuit by controlling the frequency of the PWM signal. Here, the alternating current output by the OUT1 pin and OUT2 pin in the drive circuit is input to the coupling coil through the compensation circuit composed of the capacitor C and the inductor L. Here, the micro control unit can output one or more PWM signals (as shown by the gray arrow in the figure). The gray arrow indicates that the two PWM signals output by the micro control unit are converted by the drive level conversion circuit 2 and then transmitted to the IN1 pin of the drive circuit. pin and IN2 pin). Here, the transformer circuit is a circuit that integrates a BUCK circuit and a BOOST circuit. The transformer circuit here can change the output voltage of the VOUT pin by changing the ratio of the resistor Ru and the resistor Rfb, and transmit the output voltage to the drive circuit. The VM pin in turn changes the amplitude of the alternating current output by the driver circuit. Here, the amplitude of the alternating current output by the OUT1 pin and OUT2 pin in the driver circuit is positively related to the voltage amplitude of the VM pin. Here, the power transistor Q1, power transistor Q2, power transistor Q3 and power transistor Q4 in the drive level conversion circuit can perform level conversion. Resistors R1, R2, R3, R4, R5, R6 and R7 can be used to divide the voltage. Capacitor C0, capacitor C1, capacitor C2, capacitor C3 and capacitor C4 are used for filtering. Here, VDD1, VDD2, VDD3 and VDD4 can be used as power supplies to provide voltage for various parts of the circuit.

Please refer to FIG. 10 , which is a schematic flow chart of a temperature control method provided by an embodiment of the present application. As shown in Figure 10, this temperature control method is suitable for the battery system shown in any of the above Figures 1 to 9. The temperature control method includes the following steps:

S701: The drive control circuit obtains the temperature of the battery.

S702: When the temperature of the battery is less than or equal to the first temperature threshold, the drive control circuit converts the DC power provided by the power supply into AC power, and inputs alternating current to the coupling coil to cause the coupling coil to generate an alternating magnetic field to heat the battery. .

In some feasible implementations, the drive control circuit can perform more precise control based on the temperature of the battery. Please refer to Figure 11, which is another schematic flow chart of the temperature control method provided by an embodiment of the present application. As shown in Figure 11, this temperature control method is suitable for the battery system shown in any of the above Figures 1 to 9. The temperature control method includes the following steps:

S801: The drive control circuit obtains the temperature of the battery.

S802: Determine whether the temperature of the battery is less than or equal to the first temperature threshold.

If the judgment result is yes, step S803 is executed; if the judgment result is no, step S806 is executed.

S803: The drive control circuit inputs an alternating current to the coupling coil so that the coupling coil generates an alternating magnetic field to heat the battery.

In some feasible implementations, the drive control circuit can input an alternating current to the coupling coil to generate an alternating magnetic field when the temperature is too low (for example, less than the first temperature threshold), so that the battery generates an eddy current effect through the alternating magnetic field, and then Heating the battery reduces the energy loss in transferring heat energy to the battery, improves the working efficiency of the battery, and reduces temperature control costs.

S804: Determine whether the temperature of the battery is greater than or equal to the third temperature threshold.

If the judgment result is yes, step S805 is executed; if the judgment result is no, step S803 is executed.

Here, the third temperature threshold may be the rated temperature at which the battery operates, or the temperature at which the battery operates most efficiently, or the temperature at which the battery output power is maximum, or other temperatures (or temperature ranges) that are most suitable for battery operation.

When the temperature of the battery is less than the third temperature threshold, the temperature of the battery is still relatively low. When the judgment result of S804 is no, step S803 may be performed, or the following steps may be performed:

When the temperature of the battery is less than the third temperature threshold, the transformer circuit inputs a control voltage whose amplitude is increased from the first control voltage value to the second control voltage value to the inverter circuit or the drive circuit to increase the power of the inverter circuit or the drive circuit. Alternating current input to the coupling coil.

Here, when the temperature of the battery is less than the third temperature threshold, the transformer circuit can input a control voltage whose amplitude is increased from the first control voltage value to the second control voltage value to the inverter circuit or the drive circuit to increase the power of the inverter circuit. Or the driving circuit inputs the voltage amplitude corresponding to the alternating current to the coupling coil to increase the alternating magnetic field generated by the coupling coil, thereby increasing the eddy current effect generated by the battery and speeding up the heating of the battery. Here, the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold, and the second control voltage value is greater than the first control voltage value. Here, the first control voltage may be a voltage value of the control voltage input by the transformer circuit to the inverter circuit when the temperature of the detection battery is detected. Using this application, the working efficiency of the battery system can be further improved, the circuit structure is simple, the control method is flexible, and the adaptability is strong.

Here, when the temperature of the battery is greater than or equal to the third temperature threshold, the temperature of the battery is relatively high. When the judgment result of S804 is yes, before executing step S805, the following steps may also be executed:

When the temperature of the battery is greater than or equal to the third temperature threshold and less than the second temperature threshold, the transformer circuit inputs a control voltage whose amplitude is reduced from the third control voltage value to the fourth control voltage value to the inverter circuit or the drive circuit, so as to Reduce the alternating current input from the inverter circuit or drive circuit to the coupling coil.

Here, the fourth control voltage value is smaller than the third control voltage value. Here, when the temperature of the battery is greater than or equal to the third temperature threshold, the transformer circuit can input a control voltage whose amplitude is reduced from the third control voltage value to the fourth control voltage value to the inverter circuit or the drive circuit, so as to reduce the inverter circuit or the drive circuit. The voltage amplitude corresponding to the alternating current input by the variable circuit or drive circuit to the coupling coil is reduced to reduce the alternating magnetic field generated by the coupling coil, thereby reducing the eddy current effect generated by the battery and lowering the temperature of the battery. Here, the third control voltage may be a voltage value of the control voltage input by the transformer circuit to the inverter circuit when the temperature of the detected battery is detected, and the third control voltage may be equal to the first control voltage. Using this application, the battery system can be further improved Excellent work efficiency, simple circuit structure, flexible control method and strong adaptability.

S805: Determine whether the temperature of the battery is greater than or equal to the second temperature threshold.

If the judgment result is yes, step S806 is executed; if the judgment result is no, step S803 is executed.

S806: The drive control circuit stops inputting alternating current to the coupling coil.

Here, the second temperature threshold may be a protection temperature value of the battery. When the temperature of the battery exceeds this temperature, the normal power supply of the battery may be affected or the battery system may be affected. When the temperature of the battery is less than the second temperature threshold, the determination result of step S805 is no, and the drive control circuit continues to input alternating current to the coupling coil (that is, step S803 is executed).

When the temperature of the battery is greater than or equal to the second temperature threshold, the determination result in step S805 is yes, and the drive control circuit stops inputting alternating current to the coupling coil. Using this application, the drive control circuit can stop inputting AC power to the coupling coil when the battery temperature is too high, thereby preventing the battery temperature from being too high and enhancing the safety of the battery system. The control method is simple and has strong adaptability.

In some feasible implementations, when the duration of the alternating current input to the coupling coil is greater than or equal to the heating duration threshold, the drive control circuit stops inputting the alternating current to the coupling coil to prevent the battery from being heated for too long. Here, the temperature-raising duration threshold may be the longest heating time of the battery (that is, the longest time the alternating current is continuously input to the coupling coil). When the heating time of the battery exceeds this time, it may affect the normal power supply of the battery or affect the battery system. Using this application, the drive control circuit can stop inputting alternating current to the coupling coil when the battery is heated for too long, thus enhancing the safety of the battery system. The control method is simple and adaptable.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

A battery system, characterized in that the battery system includes a battery module and a drive control circuit. The battery module includes a coupling coil and a battery with a metal structure. The coupling coil is arranged on one side of the battery. , the drive control circuit connects the coupling coil and the power supply;

The drive control circuit is used to convert the DC power provided by the power supply into AC power when the temperature of the battery is less than or equal to a first temperature threshold, and input alternating current to the coupling coil to cause the coupling The coil generates an alternating magnetic field to heat the battery.
The battery system according to claim 1, wherein the battery module provides contacts for connecting the coupling coil, and the drive control circuit connects the coupling coil through the contacts.
The battery system according to claim 2, wherein the drive control circuit includes an inverter circuit and a control circuit, the inverter circuit is connected to the control circuit and the coupling coil, and the inverter circuit is connected to a power supply. ;

The control circuit is used to control the inverter circuit to convert the DC power output by the power supply into alternating power when the temperature of the battery is less than or equal to the first temperature threshold, and based on the alternating power The alternating current is input to the coupling coil.
The battery system according to claim 2, characterized in that the drive control circuit includes a micro control unit and a drive circuit, the drive circuit connects the micro control unit and the coupling coil, the micro control unit and the coupling coil The drive circuit is connected to the power supply;

The microcontrol unit is configured to input a drive control signal to the drive circuit when the temperature of the battery is less than or equal to the first temperature threshold;

The drive circuit is configured to convert the DC power output by the power supply into alternating power based on the drive control signal, and input the alternating current to the coupling coil based on the alternating power.
The battery system according to claim 3 or 4, wherein the drive control circuit is further configured to continuously input the alternating current to the coupling coil when the temperature of the battery is less than a second temperature threshold, Wherein, the second temperature threshold is greater than the first temperature threshold;

The drive control circuit is also configured to stop inputting the alternating current to the coupling coil when the temperature of the battery is greater than or equal to the second temperature threshold.
The battery system according to claim 5, wherein the drive control circuit further includes a transformer circuit, the transformer circuit is connected to an inverter circuit of the drive control circuit, or the transformer circuit is connected to the a driving circuit that drives the control circuit;

The voltage transformer circuit is used to input a control voltage whose amplitude is raised from a first control voltage value to a second control voltage value to the inverter circuit or the drive circuit when the temperature of the battery is less than a third temperature threshold. , to increase the alternating current input by the inverter circuit or the drive circuit to the coupling coil, wherein the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold , the second control voltage value is greater than the first control voltage value.
The battery system according to claim 6, wherein the transformer circuit is further configured to convert the voltage to the battery when the temperature of the battery is greater than or equal to the third temperature threshold and less than the second temperature threshold. inverter circuit or the drive The circuit input amplitude is reduced from the third control voltage value to the fourth control voltage value to reduce the alternating current input by the inverter circuit or the drive circuit to the coupling coil, wherein, The fourth control voltage value is smaller than the third control voltage value.
The battery system according to any one of claims 1 to 7, characterized in that the drive control circuit is further configured to stop when the duration of inputting the alternating current to the coupling coil is greater than or equal to a temperature rise duration threshold. The alternating current is input to the coupling coil to prevent the battery from being heated for too long.
The battery system according to any one of claims 1 to 8, characterized in that the drive control circuit further includes a frequency conversion circuit, the frequency conversion circuit is connected to an inverter circuit of the drive control circuit, or the frequency conversion circuit is connected to The micro control unit of the drive control circuit;

The frequency conversion circuit is used to control the frequency of the alternating current input by the inverter circuit to the coupling coil to be the resonant frequency of the battery system, or by controlling the drive control input by the micro control unit to the drive circuit. The signal controls the frequency of the alternating current input by the driving circuit to the coupling coil as the resonant frequency to improve battery heating efficiency.
The battery system according to any one of claims 1 to 9, wherein the drive control circuit further includes a temperature detection circuit, a first end of the temperature detection circuit and the battery are connected to a detection point, and the The second end of the temperature detection circuit is connected to the control circuit of the drive control circuit, or the second end of the temperature detection circuit is connected to the micro control unit of the drive control circuit;

The temperature detection circuit is used to obtain the temperature of the battery based on the detection voltage of the detection point.
The battery system according to any one of claims 1-10, wherein the battery module further includes at least one set of magnetic shielding shells;

The coupling coil is arranged on one side of the battery, the at least one set of magnetic shielding shells is arranged on the periphery of the battery and the coupling coil, and one set of the magnetic shielding shells in the at least one set of magnetic shielding shells is The arrangement direction is parallel to the arrangement direction of the coupling coil.
The battery system according to claim 11, wherein the battery module includes at least two sets of magnetic shielding shells, and the at least two sets of magnetic shielding shells are arranged around the periphery of the battery and the coupling coil, and the The arrangement direction of one set of magnetic shielding shells in at least two sets of magnetic shielding shells is parallel to the arrangement direction of the coupling coil, and the arrangement direction of the other set of magnetic shielding shells in the at least two sets of magnetic shielding shells is parallel to the arrangement direction of the coupling coil. The layout direction is vertical.
The battery system according to claim 11 or 12, characterized in that the material of the magnetic shielding shell is metal shielding material, nanocrystal or other conductive material.
A temperature control method for a battery system, characterized in that the temperature control method is suitable for the battery system according to any one of claims 1 to 13, and the method includes:

The drive control circuit obtains the temperature of the battery;

When the temperature of the battery is less than or equal to the first temperature threshold, the DC power provided by the power supply is converted into AC power, and an alternating current is input to the coupling coil to cause the coupling coil to generate an alternating magnetic field. The battery is heated.
The method according to claim 14, characterized in that, after the driving control circuit inputs an alternating current to the coupling coil, the method further includes:

When the temperature of the battery is less than a second temperature threshold, the drive control circuit continues to input the alternating current to the coupling coil, wherein the second temperature threshold is greater than the first temperature threshold;

When the temperature of the battery is greater than or equal to the second temperature threshold, the drive control circuit stops inputting the alternating current to the coupling coil.
The method of claim 15, wherein when the temperature of the battery is greater than the first temperature threshold and less than the second temperature threshold, the drive control circuit continues to input the coupling coil to the coupling coil. Alternating current, including:

When the temperature of the battery is less than the third temperature threshold, the transformer circuit inputs a control voltage whose amplitude is increased from the first control voltage value to the second control voltage value to the inverter circuit or the drive circuit, so as to Increase the alternating current input by the inverter circuit or the drive circuit to the coupling coil, wherein the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold, so The second control voltage value is greater than the first control voltage value.
The method of claim 16, wherein when the temperature of the battery is greater than the first temperature threshold and less than the second temperature threshold, the drive control circuit continues to input the coupling coil to the coupling coil. Alternating current, including:

When the temperature of the battery is greater than or equal to the third temperature threshold and less than the second temperature threshold, the voltage transformer circuit inputs an amplitude of a third control voltage value to the inverter circuit or the drive circuit. Reduce the control voltage to a fourth control voltage value to reduce the alternating current input by the inverter circuit or the drive circuit to the coupling coil, wherein the fourth control voltage value is smaller than the third control voltage value. Three control voltage values.
The method according to any one of claims 14 to 17, characterized in that, after the drive control circuit inputs an alternating current to the coupling coil, the method further includes:

When the duration of the alternating current input to the coupling coil is greater than or equal to the heating duration threshold, the drive control circuit stops inputting the alternating current to the coupling coil to prevent heating of the battery. Too long.