Vehicle battery heating method, device, medium and vehicle

Abstract

The present disclosure relates to a vehicle battery heating method, device, medium and vehicle. The method includes: when the vehicle is connected to a charging pile and the positive contactor and negative contactor of the vehicle battery are closed, sending a power limit instruction to the DC converter of the vehicle battery; obtaining the current output voltage of the charging pile in real time; if the current output voltage is equal to the first request voltage information, and the duration of the current output voltage being equal to the first request voltage information reaches a preset duration, then controlling the positive contactor and / or the negative contactor to disconnect; sending power limit release information to the DC converter, and controlling the heating module of the vehicle battery to heat the vehicle battery. In this way, by limiting the power of the DC converter, the positive contactor and the negative contactor of the vehicle battery can be protected to improve the reliability of the circuit between the vehicle battery and the charging pile, and avoid failure of the vehicle battery charging function.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicles, and in particular, to a vehicle battery heating method, device, medium and vehicle. Background Art

[0002] With the popularity of electric vehicles, more and more electric vehicle companies are equipping users with small wall-mounted DC charging piles. The charging power of DC charging is higher than that of AC charging, which can effectively shorten the charging time and improve the charging efficiency. The ambient temperature is an important factor affecting whether the vehicle battery can be charged and discharged normally. When the temperature is extremely low, the vehicle battery cannot be charged and discharged normally. At present, the charging gun is mostly inserted. When the vehicle is connected to the charging pile, the electric energy obtained from the charging pile is used to heat the vehicle battery. However, in this process, the high current generated by the high-power electrical appliances in the circuit when they are turned on may cause an impact on the electrical components between the vehicle battery and the charging pile, which may cause the problem of being unable to heat and charge the vehicle battery. Summary of the invention

[0003] The purpose of the present disclosure is to provide a vehicle battery heating method, device, medium and vehicle, which protect the positive contactor and negative contactor of the vehicle battery by limiting the power of the DC converter, so as to improve the reliability of the circuit between the vehicle battery and the charging pile and avoid failure of the vehicle battery charging function.

[0004] In order to achieve the above-mentioned object, the present disclosure provides a vehicle battery heating method according to a first aspect, the method comprising:

[0005] When the vehicle is connected to the charging pile and the positive contactor and the negative contactor of the vehicle battery are both closed, a power limiting instruction is sent to the DC converter of the vehicle battery, wherein the power limiting instruction is used to limit the working power of the DC converter to be less than or equal to a preset power threshold;

[0006] Acquire the current output voltage of the charging pile in real time;

[0007] If the current output voltage is equal to the first requested voltage information, and the duration of the current output voltage being equal to the first requested voltage information reaches a preset duration, controlling the positive contactor and / or the negative contactor to be disconnected;

[0008] Power limit release information is sent to the DC converter, and the heating module of the vehicle battery is controlled to heat the vehicle battery, wherein the power limit release information is used to release the limitation that the working power of the DC converter is less than or equal to the power threshold.

[0009] Optionally, before sending the power limit instruction to the DC converter of the vehicle battery, the method further comprises:

[0010] Acquiring vehicle status information of the vehicle, wherein the vehicle status information includes vehicle speed, vehicle charging fault status information, current temperature of the vehicle battery, and heating fault status information of the heating module;

[0011] Determining, according to the vehicle state information, whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied;

[0012] When it is determined that the first closing condition is met, both the positive contactor and the negative contactor are controlled to be closed.

[0013] Optionally, determining whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied according to the vehicle state information includes:

[0014] If the vehicle speed is less than a preset speed threshold, the vehicle charging fault status information indicates that the vehicle charging function is normal, the current temperature of the vehicle battery is less than a preset first temperature threshold, and the heating fault status information indicates that the heating function of the heating module is normal, it is determined that the first closing condition is met.

[0015] Optionally, before the step of acquiring the current output voltage of the charging pile in real time, the method further includes:

[0016] Determine whether a second closing condition that both the positive charging relay and the negative charging relay of the vehicle battery are closed is met, wherein the second closing condition includes that the current working power of the DC converter is less than or equal to the power threshold and the maximum output voltage information sent by the charging pile is received;

[0017] When it is determined that the second closing condition is met, the positive charging relay and the negative charging relay are both controlled to be closed, so that the circuit between the vehicle battery and the charging pile is conductive.

[0018] Optionally, after controlling the positive charging relay and the negative charging relay to be closed, the method further includes:

[0019] If information indicating that the charging pile is in a ready state is received from the charging pile, the first requested voltage information is sent to the charging pile, so that the charging pile outputs voltage to the vehicle battery according to the first requested voltage information.

[0020] Optionally, after controlling the positive contactor and / or the negative contactor to be disconnected, the method further comprises:

[0021] A plurality of second request voltage information are sent to the charging pile according to a preset sending frequency and a preset voltage difference, until the second request voltage information sent reaches a specified voltage, so that the charging pile outputs voltage to the vehicle battery according to the plurality of second request voltage information respectively, wherein the specified voltage is the voltage corresponding to the maximum power of the heating module at the current temperature of the vehicle battery, and the initial value of the plurality of second request voltage information is determined according to the current voltage information of the vehicle battery.

[0022] Optionally, after controlling the heating module of the vehicle battery to heat the vehicle battery, the method further includes:

[0023] Obtaining the current temperature of the vehicle battery;

[0024] If the current temperature of the vehicle battery is greater than or equal to a preset second temperature threshold, a power control instruction is sent to the DC converter, and the heating module is controlled to stop heating the vehicle battery, wherein the power control instruction is used to control the operating power of the DC converter to the power threshold.

[0025] Optionally, after controlling the heating module to stop heating the vehicle battery, the method further includes:

[0026] Sending third requested voltage information and requested current information to the charging pile, so that the charging pile outputs voltage to the vehicle battery according to the third requested voltage information, and outputs current to the vehicle battery according to the requested current information;

[0027] Obtaining current information of the charging pile;

[0028] If the current current information is less than or equal to the requested current information, controlling both the positive contactor and the negative contactor to be closed;

[0029] Power control release information is sent to the DC converter so that the charging pile charges the vehicle battery and controls the heating module to heat the vehicle battery again, wherein the power control release information is used to release the limitation that the working power of the DC converter is the power threshold.

[0030] A second aspect of the present disclosure provides a vehicle battery heating device, the device comprising:

[0031] A first sending module, configured to send a power limiting instruction to a DC converter of the vehicle battery when the vehicle is connected to the charging pile and the positive contactor and the negative contactor of the vehicle battery are both closed, wherein the power limiting instruction is used to limit the working power of the DC converter to be less than or equal to a preset power threshold;

[0032] A first acquisition module, used to acquire the current output voltage of the charging pile in real time;

[0033] A first control module, configured to control the positive contactor and / or the negative contactor to disconnect if the current output voltage is equal to the first requested voltage information and the duration of the current output voltage being equal to the first requested voltage information reaches a preset duration;

[0034] The second control module is used to send power limit release information to the DC converter and control the heating module of the vehicle battery to heat the vehicle battery, wherein the power limit release information is used to release the limitation that the operating power of the DC converter is less than or equal to the power threshold.

[0035] Optionally, the device further comprises:

[0036] a second acquisition module, configured to acquire vehicle status information of the vehicle before the first sending module sends a power limiting instruction to the DC converter of the vehicle battery, wherein the vehicle status information includes vehicle speed, vehicle charging fault status information, current temperature of the vehicle battery, and heating fault status information of the heating module;

[0037] A first determination module, configured to determine whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied according to the vehicle state information;

[0038] The third control module is used to control the positive contactor and the negative contactor to close when the first determination module determines that the first closing condition is met.

[0039] Optionally, the first determination module is used to determine whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied according to the vehicle state information in the following manner:

[0040] If the vehicle speed is less than a preset speed threshold, the vehicle charging fault status information indicates that the vehicle charging function is normal, the current temperature of the vehicle battery is less than a preset first temperature threshold, and the heating fault status information indicates that the heating function of the heating module is normal, it is determined that the first closing condition is met.

[0041] Optionally, the device further comprises:

[0042] A second determination module is used to determine whether a second closing condition that both the positive charging relay and the negative charging relay of the vehicle battery are closed is met before the first acquisition module acquires the current output voltage of the charging pile in real time, wherein the second closing condition includes that the current working power of the DC converter is less than or equal to the power threshold and the maximum output voltage information sent by the charging pile is received;

[0043] The fourth control module is used to control the positive charging relay and the negative charging relay to close when the second determination module determines that the second closing condition is met, so as to connect the circuit between the vehicle battery and the charging pile.

[0044] Optionally, the device further comprises:

[0045] The second sending module is used to send the first request voltage information to the charging pile after the fourth control module controls the positive charging relay and the negative charging relay to be closed, if the information sent by the charging pile indicating that the charging pile is in a ready state is received, so that the charging pile outputs the voltage to the vehicle battery according to the first request voltage information.

[0046] Optionally, the device further comprises:

[0047] A third sending module is used to send multiple second request voltage information to the charging pile according to a preset sending frequency and a preset voltage difference after the first control module controls the positive contactor and / or the negative contactor to disconnect, until the sent second request voltage information reaches a specified voltage, so that the charging pile outputs voltage to the vehicle battery according to the multiple second request voltage information respectively, wherein the specified voltage is the voltage corresponding to the maximum power of the heating module at the current temperature of the vehicle battery, and the initial value of the multiple second request voltage information is determined according to the current voltage information of the vehicle battery.

[0048] Optionally, the device further comprises:

[0049] A third acquisition module, configured to acquire a current temperature of the vehicle battery after the second control module controls the heating module of the vehicle battery to heat the vehicle battery;

[0050] The fifth control module is used to send a power control instruction to the DC converter and control the heating module to stop heating the vehicle battery if the current temperature of the vehicle battery is greater than or equal to a preset second temperature threshold, wherein the power control instruction is used to control the operating power of the DC converter to the power threshold.

[0051] Optionally, the device further comprises:

[0052] a fourth sending module, configured to send third requested voltage information and requested current information to the charging pile after the fifth control module controls the heating module to stop heating the vehicle battery, so that the charging pile outputs voltage to the vehicle battery according to the third requested voltage information, and outputs current to the vehicle battery according to the requested current information;

[0053] A fourth acquisition module, used to acquire current current information of the charging pile;

[0054] a sixth control module, configured to control both the positive contactor and the negative contactor to be closed if the current current information is less than or equal to the requested current information;

[0055] The seventh control module is used to send power control release information to the DC converter so that the charging pile charges the vehicle battery and controls the heating module to heat the vehicle battery again, wherein the power control release information is used to release the limitation of the working power of the DC converter to the power threshold.

[0056] A third aspect of the present disclosure provides a vehicle battery heating device, comprising:

[0057] a memory having a computer program stored thereon;

[0058] A controller, wherein when the computer program is executed by the controller, the steps of the method provided in the first aspect of the present disclosure are implemented.

[0059] A fourth aspect of the present disclosure provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method provided in the first aspect of the present disclosure.

[0060] A fifth aspect of the present disclosure provides a vehicle, comprising the device provided in the second aspect of the present disclosure, or the device provided in the third aspect of the present disclosure.

[0061] Through the above technical solution, when the vehicle is connected to the charging pile and the positive contactor and negative contactor of the vehicle battery are closed, a power limit instruction is sent to the DC converter of the vehicle battery, and the current output voltage of the charging pile is obtained in real time. If the current output voltage is equal to the first request voltage information, and the duration of the current output voltage being equal to the first request voltage information reaches a preset duration, the positive contactor and / or the negative contactor are controlled to be disconnected, and then the power limit release information is sent to the DC converter, and the heating module of the vehicle battery is controlled to heat the vehicle battery. The DC converter of the vehicle battery starts working when receiving the power limit instruction, and limits its working power, which can avoid the impact of the large current generated by the DC converter at the moment of connection on the positive contactor and the negative contactor; after the current of the circuit is stable, the positive contactor and / or the negative contactor are controlled to be disconnected, which can avoid the circuit current fluctuation caused by the disconnection of the positive contactor and the negative contactor, and avoid damage to other components in the circuit, so as to improve the reliability of the circuit between the vehicle battery and the charging pile and reduce the failure of the vehicle battery charging function. Send power limit release information to the DC converter to release the power limit of the DC converter. The current working power of the DC converter is no longer restricted, the power of the DC converter becomes larger, and the current in the loop increases, thereby increasing the power of the heating module, shortening the vehicle battery heating time, and improving the vehicle battery heating efficiency.

[0062] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0064] Figure 1 is a flow chart of a vehicle battery heating method provided by an exemplary embodiment of the present disclosure;

[0065] Figure 2 is a circuit diagram of a high-voltage architecture portion between a vehicle battery and a charging pile provided by an exemplary embodiment of the present disclosure;

[0066] Figure 3 is an interaction diagram between a vehicle controller and a charging pile of a vehicle provided by an exemplary embodiment of the present disclosure;

[0067] Figure 4 is a block diagram of a vehicle battery heating device provided by an exemplary embodiment of the present disclosure;

[0068] Figure 5 is a block diagram of a vehicle battery heating device provided by another exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0069] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0070] Figure 1 The flowchart of a vehicle battery heating method provided by an exemplary embodiment of the present disclosure can be applied to a vehicle controller on a vehicle. Figure 2 is a circuit diagram of a high voltage architecture portion between a vehicle battery and a charging pile provided by an exemplary embodiment of the present disclosure, combined with Figure 2 ,right Figure 1 The method shown is described below. Figure 1 As shown, the method may include S101 to S104.

[0071] S101, when the vehicle is connected to the charging pile and the positive contactor and the negative contactor of the vehicle battery are both closed, a power limit instruction is sent to the DC converter of the vehicle battery.

[0072] The power limit instruction is used to limit the operating power of the DC converter to be less than or equal to a preset power threshold.

[0073] Exemplarily, the loop of the current circuit is composed of a vehicle battery, a positive contactor, a negative contactor and a DC converter. The power threshold can be preset, for example, set to 1kw. When the vehicle is connected to the charging pile and the positive contactor and the negative contactor of the vehicle battery are closed, the vehicle controller of the vehicle can send a power limit instruction to the DC converter of the vehicle battery. Taking the power threshold of 1kw as an example, the DC converter of the vehicle battery starts working when receiving the power limit instruction, and limits the working power of the DC converter to no more than 1kw. If the normal working power of the DC converter of the vehicle battery is greater than 1kw, for example, 2kw, the working power of the DC converter can be controlled to be reduced to 1kw.

[0074] Limiting the working power of the DC converter can avoid the impact of the large current generated when the DC converter is turned on on the positive contactor and negative contactor in the current circuit, improve the reliability of the circuit, and avoid vehicle battery charging function failure caused by damage to electrical components in the circuit.

[0075] S102, obtaining the current output voltage of the charging pile in real time.

[0076] Exemplarily, the charging pile can send the current output voltage of the charging pile to the vehicle controller in the form of a message. For example, the charging pile sends a charging pile charging status message to the vehicle controller, and the charging pile charging status message includes the current output voltage of the charging pile, wherein the charging pile charging status message may also include the current output current of the charging pile.

[0077] S103: If the current output voltage is equal to the first requested voltage information, and the duration for which the current output voltage is equal to the first requested voltage information reaches a preset duration, control the positive contactor and / or the negative contactor to be disconnected.

[0078] Exemplarily, the first requested voltage information can be determined according to the current voltage information of the vehicle battery. For example, the first requested voltage information can be the difference between the current voltage information of the vehicle battery and the preset voltage, wherein the preset voltage can be preset, for example, set to 5v, which is only an example and does not constitute a limitation on the embodiments of the present disclosure. If the current voltage information of the vehicle battery is 300v, the first requested voltage information can be 295v. The preset duration can also be preset, for example, set to 10s. For example, if the current output voltage of the charging pile is equal to 295v and the duration reaches 10s, the positive contactor and / or the negative contactor can be controlled to disconnect. Among them, one of the positive contactor and the negative contactor can be controlled to disconnect, or the positive contactor and the negative contactor can be controlled to disconnect at the same time. In this way, after the current of the circuit is stable, the positive contactor and / or the negative contactor are controlled to disconnect, which can avoid the loop current fluctuation caused by the disconnection of the positive contactor and the negative contactor, and avoid damage to other components in the loop.

[0079] S104, sending power limit release information to the DC converter, and controlling the heating module of the vehicle battery to heat the vehicle battery.

[0080] The power restriction release information is used to release the restriction that the working power of the DC converter is less than or equal to the power threshold.

[0081] Exemplarily, the loop of the current circuit is composed of a positive charging relay, a negative charging relay, a charging pile, a heating module and a DC converter. After the positive contactor and / or the negative contactor is disconnected, the vehicle battery cannot be charged, and the function of heating the vehicle battery is realized. The loop current of the current circuit can be determined by the following formula:

[0082]

[0083] Among them, I2 is the current circuit current, V2 is the current output voltage of the charging pile, P 加热模块 is the working power of the heating module, P 直流变换器 is the working power of the DC converter.加热模块 Will be affected by I2, in order to increase the heating speed, it is necessary to increase P 加热模块 Therefore, I2 needs to be increased. At this time, the vehicle controller sends power limit release information to the DC converter, so that the current working power of the DC converter is no longer restricted. The current working power of the DC converter is greater than the preset power threshold, which increases I2, thereby increasing the power of the heating module, shortening the vehicle battery heating time, and improving the heating efficiency of the vehicle battery.

[0084] Through the above technical solution, when the vehicle is connected to the charging pile and the positive contactor and negative contactor of the vehicle battery are closed, a power limit instruction is sent to the DC converter of the vehicle battery, and the current output voltage of the charging pile is obtained in real time. If the current output voltage is equal to the first request voltage information, and the duration of the current output voltage being equal to the first request voltage information reaches a preset duration, the positive contactor and / or the negative contactor are controlled to be disconnected, and then the power limit release information is sent to the DC converter, and the heating module of the vehicle battery is controlled to heat the vehicle battery. The DC converter of the vehicle battery starts working when receiving the power limit instruction, and limits its working power, which can avoid the impact of the large current generated by the DC converter at the moment of connection on the positive contactor and the negative contactor; after the current of the circuit is stable, the positive contactor and / or the negative contactor are controlled to be disconnected, which can avoid the circuit current fluctuation caused by the disconnection of the positive contactor and the negative contactor, and avoid damage to other components in the circuit, so as to improve the reliability of the circuit between the vehicle battery and the charging pile and reduce the failure of the vehicle battery charging function. Send power limit release information to the DC converter to release the power limit of the DC converter. The current working power of the DC converter is no longer restricted, the power of the DC converter becomes larger, and the current in the loop increases, thereby increasing the power of the heating module, shortening the vehicle battery heating time, and improving the vehicle battery heating efficiency.

[0085] Optionally, before sending a power limit instruction to the DC converter of the vehicle battery in S101, the vehicle battery heating method provided by the present disclosure may further include:

[0086] Obtain vehicle status information of the vehicle;

[0087] Determining, based on the vehicle state information, whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied;

[0088] When it is determined that the first closing condition is met, both the positive contactor and the negative contactor are controlled to be closed.

[0089] Among them, the vehicle status information may include vehicle speed, vehicle charging fault status information, the current temperature of the vehicle battery, and heating fault status information of the heating module. Exemplarily, the current vehicle speed can be obtained by a vehicle speed sensor. Exemplarily, the battery management system can be used to self-check the circuit between the vehicle battery and the charging pile to obtain the vehicle charging fault status information to determine whether the components and links in the circuit can be used normally, thereby avoiding the problem that the subsequent heating and charging process of the vehicle battery cannot be carried out. Exemplarily, the current temperature of the vehicle battery can be obtained by a temperature sensor set on the vehicle battery to determine whether the vehicle battery needs to be heated at the current temperature. Exemplarily, a heating module self-check instruction can be sent to the heating module by the vehicle controller. After the heating module self-check is completed, the heating module sends the heating fault status information of the heating module to the vehicle controller to determine whether the heating module can be used normally, thereby avoiding the problem that the vehicle battery cannot be heated due to damage to the heating module.

[0090] Among them, according to the vehicle status information, the implementation method of determining whether the first closing condition for closing both the positive contactor and the negative contactor is met can be: if the vehicle speed is less than a preset speed threshold, the vehicle charging fault status information indicates that the vehicle charging function is normal, the current temperature of the vehicle battery is less than the preset first temperature threshold, and the heating fault status information indicates that the heating function of the heating module is normal, then it is determined that the first closing condition is met.

[0091] Exemplarily, the vehicle speed threshold can be pre-set, wherein the vehicle speed threshold can be a smaller value, and if the vehicle speed is less than the vehicle speed threshold, it can indicate that the vehicle is stationary. For example, the vehicle speed threshold is set to 2km / h. If the vehicle speed obtained by the speed sensor is 1km / h, which is less than the speed threshold, it means that the connection between the charging pile and the vehicle is in a safe state, and there will be no danger of dragging the charging gun due to the movement of the vehicle. The first temperature threshold can be pre-set, for example, it is set to -20°C. If the current temperature of the vehicle battery obtained by the temperature sensor is -26°C, it means that the vehicle battery needs to be heated, otherwise the vehicle battery cannot be charged at this temperature. The vehicle charging function is normal, and the heating function of the heating module is normal, which can avoid the problem of being unable to heat or charge the vehicle battery due to damage to the electrical components in the circuit. If the above conditions are met, it can be determined that the first closing condition is met, and the positive contactor and the negative contactor are controlled to be closed.

[0092] When the vehicle status information satisfies the first closing condition, both the positive contactor and the negative contactor are controlled to close. Figure 2As shown, in the process of controlling the closing of the positive contactor and the negative contactor, the negative contactor and the pre-charge contactor can be controlled to close in sequence, and then the positive contactor is closed and the pre-charge relay is disconnected after the bus capacitor voltage of the vehicle micro control unit reaches 95% of the vehicle battery voltage.

[0093] Optionally, before the step of acquiring the current output voltage of the charging pile in real time in S102, the vehicle battery heating method provided by the present disclosure may further include:

[0094] Determine whether the second closing condition that the positive charging relay and the negative charging relay of the vehicle battery are both closed is met, wherein the second closing condition includes that the current working power of the DC converter is less than or equal to the power threshold and the maximum output voltage information sent by the charging pile is received;

[0095] When it is determined that the second closing condition is met, both the positive charging relay and the negative charging relay are controlled to be closed, so that the circuit between the vehicle battery and the charging pile is conductive.

[0096] For example, before the step of obtaining the current output voltage of the charging pile in real time, if the current working power of the DC converter is less than or equal to the power threshold, and the vehicle controller receives the maximum output voltage information sent by the charging pile, the positive charging relay and the negative charging relay can be controlled to be closed, such as Figure 2 As shown, at this time, the positive contactor and the negative contactor are both in the closed state, so after the positive charging relay and the negative charging relay are closed, the circuit between the vehicle battery and the charging pile can be connected.

[0097] Among them, the charging pile can send the maximum output voltage information to the vehicle controller in the form of a message. For example, the charging pile sends the charging pile maximum output capacity message to the vehicle controller. The charging pile maximum output capacity message may include the maximum output voltage information of the charging pile to avoid the request voltage subsequently sent by the vehicle controller to the charging pile exceeding the maximum output voltage of the charging pile.

[0098] After controlling the positive charging relay and the negative charging relay to be closed, the circuit between the vehicle battery and the charging pile is connected, and the charging pile outputs electrical energy to the vehicle battery. However, due to the low temperature, the vehicle battery cannot be charged, so it is necessary to first heat the vehicle battery through the heating module to ensure the smooth progress of the subsequent charging process.

[0099] Optionally, after controlling the positive charging relay and the negative charging relay to be closed, the vehicle battery heating method provided by the present disclosure may further include:

[0100] If information indicating that the charging pile is in a ready state is received from the charging pile, first request voltage information is sent to the charging pile, so that the charging pile outputs voltage to the vehicle battery according to the first request voltage information.

[0101] Exemplarily, after controlling the positive charging relay and the negative charging relay to be closed, the circuit between the vehicle battery and the charging pile is connected, and the vehicle controller and the charging pile can interact in the form of messages. For example, the vehicle controller can send a vehicle battery ready message to the charging pile, and the vehicle battery ready message may include information indicating that the vehicle battery is in a ready state. Afterwards, if a charging pile ready message sent by the charging pile is received, the charging pile ready message may include information indicating that the charging pile is in a ready state, then it can be determined that both the vehicle battery and the charging pile are ready, and the charging pile can deliver electrical energy to the vehicle battery. When both the vehicle battery and the charging pile are ready, the vehicle controller can send the first request voltage information to the charging pile in the form of a message, and the first request voltage information can be the current voltage of the vehicle battery. When the charging pile receives the first request voltage information, it adjusts its own output voltage so that the charging pile outputs voltage to the vehicle battery according to the first request voltage information.

[0102] Optionally, after controlling the positive contactor and / or the negative contactor to be disconnected in S103, the vehicle battery heating method provided by the present disclosure may further include:

[0103] Multiple second request voltage information are sent to the charging pile according to a preset sending frequency and a preset voltage difference until the sent second request voltage information reaches a specified voltage, so that the charging pile outputs voltage to the vehicle battery according to the multiple second request voltage information respectively, wherein the specified voltage is the voltage corresponding to the maximum power of the heating module at the current temperature of the vehicle battery, and the initial value of the multiple second request voltage information is determined according to the current voltage information of the vehicle battery.

[0104] Exemplarily, after controlling the positive contactor and / or the negative contactor to disconnect, the vehicle controller can send the second request voltage information to the charging pile in the form of a message, so that the charging pile controls its output voltage according to the second request voltage information. The initial value in the multiple second request voltage information can be the current voltage information of the vehicle battery after the positive contactor and / or the negative contactor are disconnected, wherein the vehicle controller sends the initial value to the charging pile, sends the power limit release information to the DC converter, and controls the heating module of the vehicle battery to heat the vehicle battery, and these three operations can be performed simultaneously.

[0105] After the heating module of the vehicle battery starts working, the heating module can send heating status information to the vehicle controller. When the vehicle controller receives the heating status information, it sends multiple second request voltage information to the charging pile according to the preset sending frequency and the preset voltage difference. Among them, the preset voltage difference can be preset, for example, it is set to 10v, and the preset sending frequency can also be preset, for example, it is set to send the second request voltage information to the charging pile in the form of a message every 1s. For example, the initial value of the second request voltage information is 200v, and the charging pile can be controlled to output the voltage to the vehicle battery at a speed of 10v / s until the second request voltage information sent, that is, the output voltage of the charging pile to the vehicle battery reaches the specified voltage, and the voltage output by the charging pile to the vehicle battery is controlled to maintain the specified voltage unchanged.

[0106] Among them, the designated voltage can be determined according to a preset corresponding relationship. Table 1 is a corresponding relationship between the peak power, voltage, and temperature of the heating module shown in an exemplary embodiment. For example, the current battery temperature is -20°C. As shown in Table 1, according to the corresponding relationship, it can be determined that when the current battery temperature is -20°C, the maximum power of the heating module is 9920w, and the voltage corresponding to the power is 400v, so the designated voltage can be set to 400v. In this way, the heating module works at its maximum power, which can further shorten the heating time and improve the battery heating efficiency.

[0107] Table 1

[0108]

[0109] Figure 3 is an interaction diagram between a vehicle controller and a charging pile provided by an exemplary embodiment of the present disclosure. Figure 3 As shown, the vehicle battery heating method may include:

[0110] S301, when the vehicle is connected to the charging pile, the vehicle controller obtains the vehicle status information of the vehicle.

[0111] The vehicle status information includes the vehicle speed, the vehicle charging fault status information, the current temperature of the vehicle battery, and the heating fault status information of the heating module.

[0112] S302: The vehicle controller determines, based on the vehicle state information, whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied.

[0113] Among them, if the vehicle speed is less than the preset speed threshold, the vehicle charging fault status information indicates that the vehicle charging function is normal, the current temperature of the vehicle battery is less than the preset first temperature threshold, and the heating fault status information indicates that the heating function of the heating module is normal, it is determined that the first closing condition is met.

[0114] S303: When it is determined that the first closing condition is met, the vehicle controller controls both the positive contactor and the negative contactor to close.

[0115] S304, the vehicle controller sends a power limit instruction to the DC converter of the vehicle battery.

[0116] S305, the charging pile sends the maximum output voltage information of the charging pile to the vehicle controller.

[0117] S306, the vehicle controller obtains the current working power of the DC converter.

[0118] S307, the vehicle controller determines whether a second closing condition that both the positive charging relay and the negative charging relay of the vehicle battery are closed is met.

[0119] Among them, the second closing condition includes that the current working power of the DC converter is less than or equal to the power threshold and the maximum output voltage information sent by the charging pile is received.

[0120] S308: When it is determined that the second closing condition is met, the vehicle controller controls both the positive charging relay and the negative charging relay to close.

[0121] S309, the vehicle controller sends information indicating that the vehicle battery is in a ready state to the charging pile.

[0122] S310, the charging pile sends information indicating that the charging pile is in a ready state to the vehicle controller.

[0123] S311, the vehicle controller sends first requested voltage information to the charging pile.

[0124] S312: The charging pile outputs voltage to the vehicle battery according to the first requested voltage information.

[0125] S313, the vehicle controller obtains the current output voltage of the charging pile in real time.

[0126] S314: If the current output voltage of the charging pile is equal to the first requested voltage information, and the duration of the current output voltage being equal to the first requested voltage information reaches a preset duration, the vehicle controller controls the positive contactor and / or the negative contactor to disconnect.

[0127] S315, the vehicle controller sends second requested voltage information to the charging pile.

[0128] S316: The charging pile outputs voltage to the vehicle battery according to the second requested voltage information.

[0129] S317, the vehicle controller sends power limit release information to the DC converter, and controls the heating module of the vehicle battery to heat the vehicle battery.

[0130] S318, the vehicle controller sends multiple second request voltage information to the charging pile according to the preset sending frequency and the preset voltage difference until the sent second request voltage information reaches the specified voltage.

[0131] S319, the charging pile outputs voltage to the vehicle battery according to the multiple second requested voltage information respectively.

[0132] The specified voltage is the voltage corresponding to the maximum power of the heating module at the current temperature of the vehicle battery.

[0133] S320, the vehicle controller obtains the current temperature of the vehicle battery.

[0134] For example, the current temperature of the vehicle battery can be acquired through a temperature sensor, and based on the current temperature of the vehicle battery, it can be determined whether the current vehicle battery can be charged while being heated, so as to improve the charging efficiency and shorten the charging time.

[0135] S321, if the current temperature of the vehicle battery is greater than or equal to a preset second temperature threshold, the vehicle controller sends a power control instruction to the DC converter and controls the heating module to stop heating the vehicle battery.

[0136] The power control instruction is used to control the working power of the DC converter to be a power threshold.

[0137] Exemplarily, the second temperature threshold can be preset, for example, to -18°C. If the current temperature of the vehicle battery is -15°C, it can be determined that the current vehicle battery can be charged while being heated to improve charging efficiency and shorten charging time. The power threshold can be preset, for example, to 1kw. Through the power control instruction, the working power of the DC converter is set to 1kw, which can reduce the current in the circuit composed of the positive charging relay, the negative charging relay and the DC converter at this time, thereby protecting the components on the current circuit. Controlling the heating module to stop heating the vehicle battery can prevent the large current generated at the moment of connection when other high-power electrical appliances are connected from affecting the electrical components in the circuit.

[0138] S322, the vehicle controller sends third requested voltage information and requested current information to the charging pile.

[0139] Exemplarily, the third requested voltage information may be the current voltage information of the vehicle battery, and the requested current information may be the ratio of the power threshold to the third requested voltage information. The vehicle controller may send the third requested voltage information and requested current information to the charging pile in the form of a message.

[0140] S323, the charging pile outputs voltage to the vehicle battery according to the third requested voltage information, and outputs current to the vehicle battery according to the requested current information.

[0141] S324, the vehicle controller obtains the current current information of the charging pile.

[0142] S325: If the current current information is less than or equal to the requested current information, the vehicle controller controls both the positive contactor and the negative contactor to be closed.

[0143] For example, if the current current information is less than or equal to the requested current information, it indicates that the current value in the loop between the vehicle battery and the charging pile is small and within a safe range. At this time, closing the positive contactor and the negative contactor will have an impact on the loop current without damaging the components in the loop. After both the positive contactor and the negative contactor are closed, the vehicle battery can be charged.

[0144] S326, the vehicle controller sends power control release information to the DC converter to enable the charging pile to charge the vehicle battery, and controls the heating module to heat the vehicle battery again.

[0145] The power control release information is used to release the limitation that the working power of the DC converter is a power threshold.

[0146] The vehicle battery can be charged at the current temperature, but due to the low temperature, the vehicle battery still needs to be heated to ensure that the vehicle battery can be charged normally. Releasing the power control of the DC converter can increase the current loop current, increase the power of the heating module, and allow the vehicle battery temperature to continue to rise, thereby speeding up the charging speed of the vehicle battery, improving the charging efficiency, and shortening the charging time.

[0147] Based on the same inventive concept, the present disclosure also provides a vehicle battery heating device. Figure 4 FIG. 4 is a block diagram of a vehicle battery heating device 400 provided by an exemplary embodiment of the present disclosure. Figure 4 , the vehicle battery heating device 400 may include:

[0148] A first sending module 401 is used to send a power limiting instruction to a DC converter of the vehicle battery when the vehicle is connected to the charging pile and the positive contactor and the negative contactor of the vehicle battery are closed, wherein the power limiting instruction is used to limit the working power of the DC converter to be less than or equal to a preset power threshold;

[0149] A first acquisition module 402 is used to acquire the current output voltage of the charging pile in real time;

[0150] A first control module 403 is used to control the positive contactor and / or the negative contactor to disconnect if the current output voltage is equal to the first requested voltage information and the duration of the current output voltage being equal to the first requested voltage information reaches a preset duration;

[0151] The second control module 404 is used to send power limit release information to the DC converter and control the heating module of the vehicle battery to heat the vehicle battery, wherein the power limit release information is used to release the limitation that the working power of the DC converter is less than or equal to the power threshold.

[0152] Through the above technical solution, when the vehicle is connected to the charging pile and the positive contactor and negative contactor of the vehicle battery are closed, a power limit instruction is sent to the DC converter of the vehicle battery, and the current output voltage of the charging pile is obtained in real time. If the current output voltage is equal to the first request voltage information, and the duration of the current output voltage being equal to the first request voltage information reaches a preset duration, the positive contactor and / or the negative contactor are controlled to be disconnected, and then the power limit release information is sent to the DC converter, and the heating module of the vehicle battery is controlled to heat the vehicle battery. The DC converter of the vehicle battery starts working when receiving the power limit instruction, and limits its working power, which can avoid the impact of the large current generated by the DC converter at the moment of connection on the positive contactor and the negative contactor; after the current of the circuit is stable, the positive contactor and / or the negative contactor are controlled to be disconnected, which can avoid the circuit current fluctuation caused by the disconnection of the positive contactor and the negative contactor, and avoid damage to other components in the circuit, so as to improve the reliability of the circuit between the vehicle battery and the charging pile and reduce the failure of the vehicle battery charging function. Send power limit release information to the DC converter to release the power limit of the DC converter. The current working power of the DC converter is no longer restricted, the power of the DC converter becomes larger, and the current in the loop increases, thereby increasing the power of the heating module, shortening the vehicle battery heating time, and improving the vehicle battery heating efficiency.

[0153] Optionally, the device 400 further includes:

[0154] A second acquisition module is used to acquire vehicle status information of the vehicle before the first sending module 401 sends a power limit instruction to the DC converter of the vehicle battery, wherein the vehicle status information includes vehicle speed, vehicle charging fault status information, current temperature of the vehicle battery, and heating fault status information of the heating module;

[0155] A first determination module, configured to determine whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied according to the vehicle state information;

[0156] The third control module is used to control the positive contactor and the negative contactor to close when the first determination module determines that the first closing condition is met.

[0157] Optionally, the first determination module is used to determine whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied according to the vehicle state information in the following manner:

[0158] If the vehicle speed is less than a preset speed threshold, the vehicle charging fault status information indicates that the vehicle charging function is normal, the current temperature of the vehicle battery is less than a preset first temperature threshold, and the heating fault status information indicates that the heating function of the heating module is normal, it is determined that the first closing condition is met.

[0159] Optionally, the device 400 further includes:

[0160] A second determination module is used to determine whether a second closing condition that both the positive charging relay and the negative charging relay of the vehicle battery are closed is met before the first acquisition module 402 acquires the current output voltage of the charging pile in real time, wherein the second closing condition includes that the current working power of the DC converter is less than or equal to the power threshold and the maximum output voltage information sent by the charging pile is received;

[0161] The fourth control module is used to control the positive charging relay and the negative charging relay to close when the second determination module determines that the second closing condition is met, so as to connect the circuit between the vehicle battery and the charging pile.

[0162] Optionally, the device 400 further includes:

[0163] The second sending module is used to send the first request voltage information to the charging pile after the fourth control module controls the positive charging relay and the negative charging relay to be closed, if the information sent by the charging pile indicating that the charging pile is in a ready state is received, so that the charging pile outputs the voltage to the vehicle battery according to the first request voltage information.

[0164] Optionally, the device 400 further includes:

[0165] The third sending module is used to send multiple second request voltage information to the charging pile according to a preset sending frequency and a preset voltage difference after the first control module 403 controls the positive contactor and / or the negative contactor to disconnect, until the sent second request voltage information reaches a specified voltage, so that the charging pile outputs voltage to the vehicle battery according to the multiple second request voltage information respectively, wherein the specified voltage is the voltage corresponding to the maximum power of the heating module at the current temperature of the vehicle battery, and the initial value of the multiple second request voltage information is determined according to the current voltage information of the vehicle battery.

[0166] Optionally, the device 400 further includes:

[0167] A third acquisition module, configured to acquire a current temperature of the vehicle battery after the second control module 404 controls the heating module of the vehicle battery to heat the vehicle battery;

[0168] The fifth control module is used to send a power control instruction to the DC converter and control the heating module to stop heating the vehicle battery if the current temperature of the vehicle battery is greater than or equal to a preset second temperature threshold, wherein the power control instruction is used to control the operating power of the DC converter to the power threshold.

[0169] Optionally, the device 400 further includes:

[0170] a fourth sending module, configured to send third requested voltage information and requested current information to the charging pile after the fifth control module controls the heating module to stop heating the vehicle battery, so that the charging pile outputs voltage to the vehicle battery according to the third requested voltage information, and outputs current to the vehicle battery according to the requested current information;

[0171] A fourth acquisition module, used to acquire current current information of the charging pile;

[0172] a sixth control module, configured to control both the positive contactor and the negative contactor to be closed if the current current information is less than or equal to the requested current information;

[0173] The seventh control module is used to send power control release information to the DC converter so that the charging pile charges the vehicle battery and controls the heating module to heat the vehicle battery again, wherein the power control release information is used to release the limitation of the working power of the DC converter to the power threshold.

[0174] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0175] Figure 5 FIG. 5 is a block diagram of a vehicle battery heating device 500 according to an exemplary embodiment. Figure 5 As shown, the vehicle battery heating device 500 may include: a processor 501 , a memory 502 . The vehicle battery heating device 500 may also include one or more of a multimedia component 503 , an input / output (I / O) interface 504 , and a communication component 505 .

[0176] The processor 501 is used to control the overall operation of the vehicle battery heating device 500 to complete all or part of the steps in the above-mentioned vehicle battery heating method. The memory 502 is used to store various types of data to support the operation of the vehicle battery heating device 500. These data may include, for example, instructions for any application or method used to operate on the vehicle battery heating device 500, and application-related data, such as contact data, sent and received messages, pictures, audio, video, etc. The memory 502 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The multimedia component 503 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 502 or sent through the communication component 505. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 504 provides an interface between the processor 501 and other interface modules, and the other interface modules may be keyboards, mice, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 505 is used for wired or wireless communication between the vehicle battery heating device 500 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 505 may include: Wi-Fi module, Bluetooth module, NFC module, etc.

[0177] In an exemplary embodiment, the vehicle battery heating device 500 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned vehicle battery heating method.

[0178] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the above-mentioned vehicle battery heating method are implemented. For example, the computer-readable storage medium can be the above-mentioned memory 502 including program instructions, and the above-mentioned program instructions can be executed by the processor 501 of the vehicle battery heating device 500 to complete the above-mentioned vehicle battery heating method.

[0179] In another exemplary embodiment, a computer program product is also provided. The computer program product includes a computer program executable by a programmable device, and has a code portion for executing the above-mentioned vehicle battery heating method when the computer program is executed by the programmable device.

[0180] The present disclosure further provides a vehicle, including the vehicle battery heating device 400 provided by the present disclosure, or the vehicle battery heating device 500 provided by the present disclosure.

[0181] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0182] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0183] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A vehicle battery heating method, characterized in that: The method includes: When the vehicle is connected to the charging pile and the positive contactor and the negative contactor of the vehicle battery are both closed, a power limiting instruction is sent to the DC converter of the vehicle battery, wherein the power limiting instruction is used to limit the working power of the DC converter to be less than or equal to a preset power threshold; Acquire the current output voltage of the charging pile in real time; If the current output voltage is equal to the first requested voltage information, and the duration of the current output voltage being equal to the first requested voltage information reaches a preset duration, controlling the positive contactor and / or the negative contactor to be disconnected; Power limit release information is sent to the DC converter, and the heating module of the vehicle battery is controlled to heat the vehicle battery, wherein the power limit release information is used to release the limitation that the working power of the DC converter is less than or equal to the power threshold.

2. The method according to claim 1, characterized in that: Before sending a power limit instruction to the DC converter of the vehicle battery, the method further includes: Acquiring vehicle status information of the vehicle, wherein the vehicle status information includes vehicle speed, vehicle charging fault status information, current temperature of the vehicle battery, and heating fault status information of the heating module; Determining, according to the vehicle state information, whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied; When it is determined that the first closing condition is met, both the positive contactor and the negative contactor are controlled to be closed.

3. The method according to claim 2, characterized in that The determining, based on the vehicle state information, whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied includes: If the vehicle speed is less than a preset speed threshold, the vehicle charging fault status information indicates that the vehicle charging function is normal, the current temperature of the vehicle battery is less than a preset first temperature threshold, and the heating fault status information indicates that the heating function of the heating module is normal, it is determined that the first closing condition is met.

4. The method according to claim 1, characterized in that: Before the step of acquiring the current output voltage of the charging pile in real time, the method further includes: Determine whether a second closing condition that both the positive charging relay and the negative charging relay of the vehicle battery are closed is met, wherein the second closing condition includes that the current working power of the DC converter is less than or equal to the power threshold and the maximum output voltage information sent by the charging pile is received; When it is determined that the second closing condition is met, the positive charging relay and the negative charging relay are both controlled to be closed, so that the circuit between the vehicle battery and the charging pile is conductive.

5. The method according to claim 4, characterized in that After controlling the positive electrode charging relay and the negative electrode charging relay to be closed, the method further includes: If information indicating that the charging pile is in a ready state is received from the charging pile, the first requested voltage information is sent to the charging pile, so that the charging pile outputs voltage to the vehicle battery according to the first requested voltage information.

6. The method according to claim 1, characterized in that After controlling the positive contactor and / or the negative contactor to be disconnected, the method further includes: A plurality of second request voltage information are sent to the charging pile according to a preset sending frequency and a preset voltage difference, until the second request voltage information sent reaches a specified voltage, so that the charging pile outputs voltage to the vehicle battery according to the plurality of second request voltage information respectively, wherein the specified voltage is the voltage corresponding to the maximum power of the heating module at the current temperature of the vehicle battery, and the initial value of the plurality of second request voltage information is determined according to the current voltage information of the vehicle battery.

7. The method according to claim 1, characterized in that After controlling the heating module of the vehicle battery to heat the vehicle battery, the method further includes: Obtaining a current temperature of the vehicle battery; If the current temperature of the vehicle battery is greater than or equal to a preset second temperature threshold, a power control instruction is sent to the DC converter, and the heating module is controlled to stop heating the vehicle battery, wherein the power control instruction is used to control the operating power of the DC converter to the power threshold.

8. The method according to claim 7, characterized in that After controlling the heating module to stop heating the vehicle battery, the method further includes: Sending third requested voltage information and requested current information to the charging pile, so that the charging pile outputs voltage to the vehicle battery according to the third requested voltage information, and outputs current to the vehicle battery according to the requested current information; Obtaining current information of the charging pile; If the current current information is less than or equal to the requested current information, controlling both the positive contactor and the negative contactor to be closed; Power control release information is sent to the DC converter so that the charging pile charges the vehicle battery and controls the heating module to heat the vehicle battery again, wherein the power control release information is used to release the limitation that the working power of the DC converter is the power threshold.

9. A vehicle battery heating device, characterized in that: The device includes: A first sending module, configured to send a power limiting instruction to a DC converter of the vehicle battery when the vehicle is connected to the charging pile and the positive contactor and the negative contactor of the vehicle battery are both closed, wherein the power limiting instruction is used to limit the working power of the DC converter to be less than or equal to a preset power threshold; A first acquisition module, used to acquire the current output voltage of the charging pile in real time; A first control module, configured to control the positive contactor and / or the negative contactor to disconnect if the current output voltage is equal to the first requested voltage information and the duration of the current output voltage being equal to the first requested voltage information reaches a preset duration; The second control module is used to send power limit release information to the DC converter and control the heating module of the vehicle battery to heat the vehicle battery, wherein the power limit release information is used to release the limitation that the operating power of the DC converter is less than or equal to the power threshold.

10. A vehicle battery heating device, characterized in that: include: a memory having a computer program stored thereon; A controller, wherein when the computer program is executed by the controller, the steps of the method according to any one of claims 1 to 8 are implemented.

11. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 8 are implemented.

12. A vehicle, characterized in that: Comprising the device as claimed in claim 9, or the device as claimed in claim 10.

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