CN115042671B

CN115042671B - Vehicle battery heating method, device, medium and vehicle

Info

Publication number: CN115042671B
Application number: CN202111045861.8A
Authority: CN
Inventors: 王峰军; 王贺涛
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2025-02-28
Anticipated expiration: 2041-09-07
Also published as: CN115042671A

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

Vehicle battery heating method and device, medium and vehicle

Technical Field

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

Background

Along with electric vehicle's popularization, more and more electric vehicle enterprises are equipped with small-size hanging direct current fills electric pile for the user, and direct current charging's charge power is higher than alternating current charging's charge power, can effectively shorten the time of charging, improves charging efficiency. The ambient temperature is an important factor affecting whether the vehicle battery can be charged or discharged normally, and the vehicle battery cannot be charged or discharged normally under the condition of extremely low temperature. At present, a charging gun is inserted, under the condition that a vehicle is connected with a charging pile, electric energy obtained through the charging pile is used for heating a vehicle battery, but in the process, high current generated in the moment of switching on a high-power electric appliance in a circuit possibly impacts an electric appliance element between the vehicle battery and the charging pile, so that the problem that the vehicle battery cannot be heated and charged is possibly caused.

Disclosure of Invention

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

To achieve the above object, a first aspect of the present disclosure provides a vehicle battery heating method, the method comprising:

Under the condition that a vehicle is connected with a charging pile, and a positive contactor and a negative contactor of a vehicle battery are both closed, a power limiting instruction is sent to a direct current converter of the vehicle battery, wherein the power limiting instruction is used for limiting the working power of the direct current converter to be smaller than or equal to a preset power threshold value;

Acquiring the current output voltage of the charging pile in real time;

If the current output voltage is equal to first request voltage information and the duration time of the current output voltage equal to the first request voltage information reaches a preset duration time, the positive contactor and/or the negative contactor are/is controlled to be disconnected;

And sending power limitation canceling information to the direct current converter, and controlling a heating module of the vehicle battery to heat the vehicle battery, wherein the power limitation canceling information is used for canceling the limitation that the working power of the direct current converter is smaller than or equal to the power threshold value.

Optionally, before sending the power limiting command to the dc converter of the vehicle battery, the method further comprises:

Acquiring vehicle state information of the vehicle, wherein the vehicle state information comprises vehicle speed, vehicle charging fault state information, current temperature of the vehicle battery and heating fault state information of the heating module;

determining whether a first closing condition for closing both the positive contactor and the negative contactor is satisfied according to the vehicle state information;

And controlling the positive electrode contactor and the negative electrode contactor to be closed when the first closing condition is determined to be met.

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

and if the vehicle speed is smaller than a preset vehicle speed threshold, the vehicle charging fault state information indicates that the vehicle charging function is normal, the current temperature of the vehicle battery is smaller than a preset first temperature threshold, and the heating fault state information indicates that the heating function of the heating module is normal, determining that the first closing condition is met.

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

Determining whether a second closing condition that both a positive charging relay and a negative charging relay of the vehicle battery are closed is met, wherein the second closing condition comprises that the current working power of the direct current converter is smaller than or equal to the power threshold value, and maximum output voltage information sent by the charging pile is received;

and controlling the positive electrode charging relay and the negative electrode charging relay to be closed under the condition that the second closing condition is met, so that a loop between the vehicle battery and the charging pile is conducted.

Optionally, after controlling the positive charging relay and the negative charging relay to both close, the method further comprises:

and if the information which is sent by the charging pile and is used for representing that the charging pile is in a ready state is received, the 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.

Optionally, after controlling the positive contactor and/or the negative contactor to open, the method further comprises:

And sending a plurality of second request voltage information to the charging pile according to a preset sending frequency and a preset voltage difference value 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 second request voltage information, wherein the specified voltage is a voltage corresponding to the maximum power of the heating module at the current temperature of the vehicle battery, and the initial value in the second request voltage information is determined according to the current voltage information of the vehicle battery.

Optionally, after controlling the heating module of the vehicle battery to heat the vehicle battery, the method further comprises:

acquiring the current temperature of the vehicle battery;

And if the current temperature of the vehicle battery is greater than or equal to a preset second temperature threshold, sending a power control instruction to the direct current converter, and controlling the heating module to stop heating the vehicle battery, wherein the power control instruction is used for controlling the working power of the direct current converter to be the power threshold.

Optionally, after controlling the heating module to stop heating the vehicle battery, the method further comprises:

Transmitting third request voltage information and request current information to the charging pile so that the charging pile outputs voltage to the vehicle battery according to the third request voltage information and outputs current to the vehicle battery according to the request current information;

Acquiring current information of the charging pile;

If the current information is smaller than or equal to the request current information, controlling the positive contactor and the negative contactor to be closed;

and sending power control release information to the direct current converter so as to enable the charging pile to charge the vehicle battery and control the heating module to heat the vehicle battery again, wherein the power control release information is used for releasing the limit of the working power of the direct current converter to the power threshold value.

A second aspect of the present disclosure provides a vehicle battery heating apparatus, the apparatus comprising:

The device comprises a first sending module, a second sending module and a third sending module, wherein the first sending module is used for sending a power limiting instruction to a direct current converter of a vehicle battery under the condition that the vehicle is connected with a charging pile and both a positive contactor and a negative contactor of the vehicle battery are closed, and the power limiting instruction is used for limiting the working power of the direct current converter to be smaller than or equal to a preset power threshold value;

The first acquisition module is used for acquiring the current output voltage of the charging pile in real time;

The first control module is used for controlling the disconnection of the positive contactor and/or the negative contactor if the current output voltage is equal to first request voltage information and the duration time of the current output voltage equal to the first request voltage information reaches a preset duration time;

and the second control module is used for sending power limitation canceling information to the direct current converter and controlling the heating module of the vehicle battery to heat the vehicle battery, wherein the power limitation canceling information is used for canceling the limitation that the working power of the direct current converter is smaller than or equal to the power threshold value.

Optionally, the apparatus further comprises:

The second acquisition module is used for acquiring vehicle state information of the vehicle before the first transmission module transmits a power limiting instruction to the direct current converter of the vehicle battery, wherein the vehicle state information comprises vehicle speed, vehicle charging fault state information, the current temperature of the vehicle battery and heating fault state information of the heating module;

a first determining 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;

And the third control module is used for controlling the positive electrode contactor and the negative electrode contactor to be closed when the first determination module determines that the first closing condition is met.

Optionally, the first determining module is configured to determine, according to the vehicle state information, whether a first closing condition for closing both the positive electrode contactor and the negative electrode contactor is satisfied by:

Optionally, the apparatus further comprises:

The second determining module is used for determining whether a second closing condition that both a positive charging relay and a negative charging relay of the vehicle battery are closed is met or not before the first obtaining module obtains the current output voltage of the charging pile in real time, wherein the second closing condition comprises that the current working power of the direct current converter is smaller than or equal to the power threshold value and maximum output voltage information sent by the charging pile is received;

And the fourth control module is used for controlling the positive charging relay and the negative charging relay to be closed under the condition that the second determination module determines that the second closing condition is met so as to conduct a loop between the vehicle battery and the charging pile.

Optionally, the apparatus further comprises:

And the second sending module is used for sending the first request voltage information to the charging pile if the information which is sent by the charging pile and indicates that the charging pile is in a ready state is received after the fourth control module controls the positive charging relay and the negative charging relay to be closed, so that the charging pile outputs voltage to the vehicle battery according to the first request voltage information.

Optionally, the apparatus further comprises:

and the third sending module is used for sending a plurality of second request voltage information to the charging pile according to a preset sending frequency and according to a preset voltage difference value after the first control module controls the positive electrode contactor and/or the negative electrode contactor to be disconnected, 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 plurality of second request voltage information respectively, wherein the specified voltage is a voltage corresponding to the maximum power of the heating module at the current temperature of the vehicle battery, and the initial value in the plurality of second request voltage information is determined according to the current voltage information of the vehicle battery.

Optionally, the apparatus further comprises:

The third acquisition module is used for acquiring the current temperature of the vehicle battery after the second control module controls the heating module of the vehicle battery to heat the vehicle battery;

And the fifth control module is used for sending a power control instruction to the direct current converter and controlling 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 value, wherein the power control instruction is used for controlling the working power of the direct current converter to be the power threshold value.

Optionally, the apparatus further comprises:

a fourth sending module, configured to send third request voltage information and request 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 request voltage information, and outputs current to the vehicle battery according to the request current information;

A fourth obtaining module, configured to obtain current information of the charging pile;

The sixth control module is used for controlling the positive contactor and the negative contactor to be closed if the current information is smaller than or equal to the request current information;

And a seventh control module, configured to send power control release information to the dc converter, so that the charging pile charges the vehicle battery, and control the heating module to reheat the vehicle battery, where the power control release information is used to release the limitation that the operating power of the dc converter is the power threshold.

A third aspect of the present disclosure provides a vehicle battery heating apparatus, comprising:

a memory having a computer program stored thereon;

and a controller, the computer program implementing the steps of the method provided in the first aspect of the disclosure when executed by the controller.

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

A fifth aspect of the present disclosure provides a vehicle comprising the apparatus provided in the second aspect of the present disclosure, or the apparatus provided in the third aspect of the present disclosure.

According to the technical scheme, under the condition that the vehicle is connected with the charging pile and the positive electrode contactor and the negative electrode contactor of the vehicle battery are both closed, a power limiting instruction is sent to the direct current converter of the vehicle battery, 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 time of the current output voltage equal to the first request voltage information reaches the preset duration time, the positive electrode contactor and/or the negative electrode contactor is controlled to be disconnected, then power limiting release information is sent to the direct current converter, and the heating module of the vehicle battery is controlled to heat the vehicle battery. The direct current converter of the vehicle battery starts working when receiving the power limiting instruction, limits the working power of the direct current converter, can avoid impact on the positive electrode contactor and the negative electrode contactor caused by large current generated at the moment of switching on the direct current converter, controls the positive electrode contactor and/or the negative electrode contactor to switch off after the current of the circuit is stable, can avoid loop current fluctuation caused by switching off the positive electrode contactor and the negative electrode contactor, and can avoid damage to other components in the loop, so that the reliability of the loop between the vehicle battery and the charging pile is improved, and the charging function fault of the vehicle battery is reduced. And sending power limitation canceling information to the direct current converter to cancel the power limitation of the direct current converter, wherein the working power of the current direct current converter is not limited any more, and the power of the direct current converter is increased to increase the current in the loop, so that the power of the heating module is improved, the heating time of the vehicle battery is shortened, and the heating efficiency of the vehicle battery is improved.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a flow chart of a method of heating a vehicle battery provided in an exemplary embodiment of the present disclosure;

Fig. 2 is a circuit diagram of a high voltage architecture portion between a vehicle battery and a charging stake according to an exemplary embodiment of the present disclosure;

fig. 3 is an interaction diagram between a vehicle controller and a charging pile of a vehicle according to an exemplary embodiment of the present disclosure;

FIG. 4 is a block diagram of a vehicle battery heating apparatus provided by an exemplary embodiment of the present disclosure;

fig. 5 is a block diagram of a vehicle battery heating apparatus provided in another exemplary embodiment of the present disclosure.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

Fig. 1 is a flowchart of a vehicle battery heating method provided in an exemplary embodiment of the present disclosure. The method can be applied to a whole vehicle controller on a vehicle. Fig. 2 is a circuit diagram of a high voltage construction portion between a vehicle battery and a charging pile according to an exemplary embodiment of the present disclosure, and the method shown in fig. 1 will be described with reference to fig. 2. As shown in fig. 1, the method may include S101 to S104.

S101, when the vehicle is connected to the charging pile and both the positive and negative contactors of the vehicle battery are closed, a power limitation instruction is transmitted to the dc converter of the vehicle battery.

The power limiting instruction is used for limiting the working power of the direct current converter to be smaller than or equal to a preset power threshold value.

The circuit of the present circuit is formed by a vehicle battery, a positive contactor, a negative contactor, and a dc converter, for example. The power threshold may be preset, for example, to 1kw, and the vehicle controller of the vehicle may transmit a power limiting instruction to the dc converter of the vehicle battery in a case where the vehicle is connected to the charging pile and both the positive and negative contactors of the vehicle battery are closed. Taking the power threshold value of 1kw as an example, when the direct current converter of the vehicle battery starts to work when receiving the power limiting instruction, and the working power of the direct current converter is limited to be not more than 1kw, wherein if the normal working power of the direct current converter of the vehicle battery is more than 1kw, for example, 2kw, the working power of the direct current converter can be controlled to be reduced to 1kw.

The working power of the direct current converter is limited, so that the impact of high current generated at the moment of switching on the direct current converter on the positive electrode contactor and the negative electrode contactor in the current loop can be avoided, the reliability of the loop is improved, and the fault of the charging function of the vehicle battery caused by the damage of electrical elements in the loop is avoided.

S102, acquiring the current output voltage of the charging pile in real time.

The charging pile may 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 state message to the vehicle controller, where the charging pile charging state message includes the current output voltage of the charging pile, and the charging pile charging state message may also include the current output current of the charging pile.

And S103, if the current output voltage is equal to the first request voltage information and the duration of the current output voltage equal to the first request voltage information reaches the preset duration, the positive contactor and/or the negative contactor are/is controlled to be disconnected.

For example, the first request voltage information may be determined according to current voltage information of the vehicle battery, for example, the first request voltage information may be a difference between the current voltage information of the vehicle battery and a preset voltage, wherein the preset voltage may be preset, for example, to 5v, which is just an example, and does not constitute a limitation of the embodiment of the present disclosure, and if the current voltage information of the vehicle battery is 300v, the first request voltage information may be 295v. The preset time period may also be set in advance, for example, to 10s. For example, if the current output voltage of the charging pile is equal to 295v and the duration reaches 10s, the positive and/or negative contactors may be controlled to open. Wherein one of the positive and negative contactors may be controlled to open, or simultaneously open with the control of the positive and negative contactors. Therefore, after the current of the circuit is stable, the positive electrode contactor and/or the negative electrode contactor are/is controlled to be disconnected, so that loop current fluctuation caused by the disconnection of the positive electrode contactor and the negative electrode contactor can be avoided, and damage to other components in the loop is avoided.

And S104, transmitting power limitation release information to the direct current converter, and controlling a heating module of the vehicle battery to heat the vehicle battery.

The power limit release information is used for releasing the limit that the working power of the direct current converter is smaller than or equal to a power threshold value.

The current circuit is composed of a positive charging relay, a negative charging relay, a charging pile, a heating module and a direct current converter, wherein after the positive contactor and/or the negative contactor are/is disconnected, the vehicle battery cannot be charged, the function of heating only the vehicle battery is realized, and the current circuit of the current circuit can be determined by the following formula:

Wherein I ₂ is the loop current of the current circuit, V ₂ is the current output voltage of the charging pile, P _{Heating module} is the operating power of the heating module, and P _{DC converter} is the operating power of the dc converter. P _{Heating module} is affected by I ₂, in order to increase the heating speed, P _{Heating module} needs to be increased, so that I ₂ needs to be increased, and at the moment, the whole vehicle controller sends power limitation release information to the direct current converter, so that the working power of the current direct current converter is not limited any more, the working power of the current direct current converter is larger than a preset power threshold value, and then I ₂ is increased, so that the power of a heating module is increased, the heating time of a vehicle battery is shortened, and the heating efficiency of the vehicle battery is improved.

Optionally, before the power limiting instruction is sent to the dc converter of the vehicle battery in S101, the vehicle battery heating method provided by the present disclosure may further include:

Acquiring vehicle state information of a vehicle;

determining whether a first closing condition for closing both the positive electrode contactor and the negative electrode contactor is satisfied according to the vehicle state information;

in the case where it is determined that the first closing condition is satisfied, both the positive electrode contactor and the negative electrode contactor are controlled to be closed.

The vehicle state information may include, among other things, a vehicle speed, vehicle charge failure state information, a current temperature of a vehicle battery, and heating failure state information of a heating module. For example, the current vehicle speed may be obtained by a vehicle speed sensor. By way of example, the circuit between the vehicle battery and the charging pile can be self-checked through the battery management system, so that the vehicle charging fault state information is obtained, whether components and links in the circuit can be used normally or not is determined, and the problem that the subsequent heating and charging processes of the vehicle battery cannot be performed is avoided. For example, the current temperature of the vehicle battery may be obtained by a temperature sensor provided on the vehicle battery for determining whether the vehicle battery needs to be heated at the current temperature. The heating module can send a self-checking instruction to the heating module through the whole vehicle controller, and after the self-checking of the heating module is finished, the heating module sends heating fault state information of the heating module to the whole vehicle controller so as to determine whether the heating module can be used normally or not, so that the problem that a vehicle battery cannot be heated due to the damage of the heating module is avoided.

The implementation mode of determining whether the first closing condition for closing both the positive electrode contactor and the negative electrode contactor is met according to the vehicle state information can be that if the vehicle speed is smaller than a preset vehicle speed threshold value, the vehicle charging fault state information indicates that the vehicle charging function is normal, the current temperature of the vehicle battery is smaller than a preset first temperature threshold value, and the heating fault state information indicates that the heating function of the heating module is normal, the first closing condition is determined to be met.

For example, a vehicle speed threshold may be preset, wherein the vehicle speed threshold may be a small value, and if the vehicle speed is smaller than the vehicle speed threshold, it may indicate that the vehicle is in a stationary state. For example, the vehicle speed threshold is set to 2km/h, and if the vehicle speed obtained by the vehicle speed sensor is 1km/h, a value smaller than the vehicle speed threshold indicates that the connection between the charging pile and the vehicle is in a safe state, and no danger is generated due to the movement of the vehicle to drag the charging gun. The first temperature threshold may be preset, for example, to-20 ℃, and if the current temperature of the vehicle battery obtained by the temperature sensor is-26 ℃, this indicates 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, so that the problem that the vehicle battery cannot be heated or charged due to damage of electrical components in the circuit can be avoided. If the above conditions are met, it may be determined that the first closing condition is met, and the positive and negative electrode contactors are controlled to be closed.

And under the condition that the vehicle state information meets the first closing condition, controlling the positive electrode contactor and the negative electrode contactor to be closed, as shown in fig. 2, in the process of controlling the positive electrode contactor and the negative electrode contactor to be closed, sequentially controlling the negative electrode contactor to be closed, pre-charging the contactors, and then waiting until the bus capacitor voltage of the vehicle micro-control unit reaches 95% of the vehicle battery voltage, closing the positive electrode contactor, and opening the pre-charging relay.

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:

Determining 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 comprises that the current working power of the direct current converter is smaller than or equal to a power threshold value, and maximum output voltage information sent by a charging pile is received;

and under the condition that the second closing condition is met, controlling the positive charging relay and the negative charging relay to be closed so as to conduct a loop between the vehicle battery and the charging pile.

In an exemplary embodiment, 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 may be controlled to be both closed, as shown in fig. 2, and at this time, the positive contactor and the negative contactor are both in a closed state, so after both the positive charging relay and the negative charging relay are closed, the loop between the vehicle battery and the charging pile may be conducted.

The charging pile can send maximum output voltage information to the whole vehicle controller in a message form, for example, the charging pile sends a maximum output capacity message of the charging pile to the whole vehicle controller, and the maximum output capacity message of the charging pile can include the maximum output voltage information of the charging pile so as to prevent the request voltage subsequently sent to the charging pile by the whole vehicle controller from exceeding the maximum output voltage of the charging pile.

After the positive charging relay and the negative charging relay are controlled to be closed, a loop between the vehicle battery and the charging pile is conducted, and the charging pile outputs electric energy to the vehicle battery.

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

And if the information which is sent by the charging pile and indicates that the charging pile is in a ready state is received, sending first request voltage information to the charging pile so that the charging pile outputs voltage to the vehicle battery according to the first request voltage information.

The circuit between the vehicle battery and the charging pile is conducted after the positive charging relay and the negative charging relay are controlled to be closed, and interaction between the vehicle controller and the charging pile can be performed in a message mode. For example, the overall vehicle controller may send a vehicle battery ready message to the charging post, the vehicle battery ready message may include information indicating that the vehicle battery is in a ready state, and then, if the charging post ready message sent by the charging post is received, the charging post ready message may include information indicating that the charging post is in a ready state, it may be determined that both the vehicle battery and the charging post are ready, and the charging post may transmit electrical energy to the vehicle battery. Under the condition that a vehicle battery and a charging pile are ready, the whole vehicle controller can send first request voltage information to the charging pile in a message mode, the first request voltage information can be the current voltage of the vehicle battery, and the charging pile adjusts the output voltage under the condition that the charging pile receives the first request voltage information, so that the charging pile outputs voltage to the vehicle battery according to the first request voltage information.

Optionally, after controlling the opening of the positive electrode contactor and/or the negative electrode contactor in S103, the vehicle battery heating method provided by the present disclosure may further include:

And sending a plurality of second request voltage information to the charging pile according to the preset sending frequency and the preset voltage difference value 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 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 in the plurality of second request voltage information is determined according to the current voltage information of the vehicle battery.

For example, after controlling the opening of the positive and/or negative contactors, the whole vehicle controller may 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 plurality of second request voltage information may be current voltage information of the vehicle battery after the positive electrode contactor and/or the negative electrode contactor are opened, wherein the three operations may be performed simultaneously by the vehicle controller transmitting the initial value to the charging pile, transmitting the power limitation release information to the dc converter, and controlling the heating module of the vehicle battery to heat the vehicle battery.

After the heating module of the vehicle battery starts to work, the heating module can send heating state information to the whole vehicle controller, and the whole vehicle controller sends a plurality of second request voltage information to the charging pile according to preset sending frequency and preset voltage difference values under the condition that the whole vehicle controller receives the heating state information. The preset voltage difference may be preset, for example, set to 10v, and the preset sending frequency may also be preset, for example, set to send the second request voltage information to the charging pile every 1s in a message form, for example, the initial value of the second request voltage information is 200v, and the charging pile may be controlled to output the voltage to the vehicle battery according to the change speed of 10v/s until the sent second request voltage information, that is, the voltage output by the charging pile to the vehicle battery reaches the specified voltage, and then the voltage output by the charging pile to the vehicle battery is controlled to maintain the specified voltage unchanged.

The specific voltage may be determined according to a preset correspondence, table 1 is a correspondence between peak power, voltage, and temperature of the heating module shown in an exemplary embodiment, for example, the current battery temperature is-20 ℃, as shown in table 1, according to the correspondence, it may be determined that when the current battery temperature is-20 ℃, the maximum power of the heating module is 9920w, the voltage corresponding to the power is 400v, and then the specific voltage may be set to 400v. Therefore, the heating module works according to the maximum power, the heating time can be further shortened, and the heating efficiency of the battery is improved.

TABLE 1

Fig. 3 is an interaction diagram between a vehicle controller and a charging pile according to an exemplary embodiment of the present disclosure. As shown in fig. 3, the vehicle battery heating method may include:

S301, in a case where the vehicle is connected to the charging pile, the whole vehicle controller acquires vehicle state information of the vehicle.

The vehicle state information comprises vehicle speed, vehicle charging fault state information, current temperature of a vehicle battery and heating fault state information of a heating module.

S302, the whole vehicle controller determines whether a first closing condition for closing both the positive contactor and the negative contactor is met according to the vehicle state information.

If the vehicle speed is smaller than a preset vehicle speed threshold, the vehicle charging fault state information indicates that the vehicle charging function is normal, the current temperature of the vehicle battery is smaller than a preset first temperature threshold, and the heating fault state information indicates that the heating function of the heating module is normal, the first closing condition is determined to be met.

S303, under the condition that the first closing condition is met, the whole vehicle controller controls the positive electrode contactor and the negative electrode contactor to be closed.

S304, the whole vehicle controller sends a power limiting instruction to a direct current converter of a vehicle battery.

And S305, the charging pile sends maximum output voltage information of the charging pile to the whole vehicle controller.

S306, the whole vehicle controller obtains the current working power of the direct current converter.

S307, the whole vehicle controller determines whether a second closing condition that both the positive charge relay and the negative charge relay of the vehicle battery are closed is satisfied.

The second closing condition comprises that the current working power of the direct current converter is smaller than or equal to a power threshold value, and maximum output voltage information sent by the charging pile is received.

And S308, controlling the positive electrode charging relay and the negative electrode charging relay to be closed by the whole vehicle controller under the condition that the second closing condition is met.

S309, the whole vehicle controller sends information representing that the vehicle battery is in a ready state to the charging pile.

And S310, the charging pile sends information representing that the charging pile is in a ready state to the whole vehicle controller.

S311, the vehicle controller sends first request voltage information to the charging pile.

And S312, the charging pile outputs voltage to the vehicle battery according to the first request voltage information.

S313, the whole vehicle controller acquires the current output voltage of the charging pile in real time.

S314, if the current output voltage of the charging pile is equal to the first request voltage information and the duration time of the current output voltage equal to the first request voltage information reaches the preset duration time, the whole vehicle controller controls the positive contactor and/or the negative contactor to be disconnected.

S315, the whole vehicle controller sends second request voltage information to the charging pile.

And S316, the charging pile outputs voltage to the vehicle battery according to the second request voltage information.

S317, the whole vehicle controller sends power limit release information to the direct current converter and controls the heating module of the vehicle battery to heat the vehicle battery.

S318, the whole vehicle controller sends a plurality of second request voltage information to the charging pile according to the preset sending frequency and the preset voltage difference value until the sent second request voltage information reaches the designated voltage.

And S319, the charging piles output voltages to the vehicle battery according to the second request voltage information.

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

S320, the whole vehicle controller acquires the current temperature of the vehicle battery.

For example, the current temperature of the vehicle battery may be obtained through the temperature sensor, and according to the current temperature of the vehicle battery, it may be determined whether the current vehicle battery may be charged while being heated, so as to improve charging efficiency and shorten charging time.

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

The power control command is used for controlling the working power of the direct current converter to be a power threshold value.

For example, the second temperature threshold may be preset, for example, set to-18 ℃, and if the current temperature of the vehicle battery is-15 ℃, it may be determined that the current vehicle battery may be charged while heating, so as to improve the charging efficiency and shorten the charging time. The power threshold may be preset, for example, to 1kw, and by the power control command, the operating power of the dc converter is set to 1kw, so that the current in the circuit formed by the positive charging relay, the negative charging relay and the dc converter at this time may be reduced, thereby protecting the components on the current circuit. The heating module is controlled to stop heating the vehicle battery, so that the influence of the heavy current generated at the moment of switching on electric elements in the circuit can be prevented when other high-power electric appliances are connected.

S322, the whole vehicle controller sends third request voltage information and request current information to the charging pile.

For example, the third request voltage information may be current voltage information of the vehicle battery, the request current information may be a ratio of the power threshold value to the third request voltage information, and the whole vehicle controller may transmit the third request voltage information and the request current information to the charging pile in the form of a message.

S323, the charging pile outputs a voltage to the vehicle battery according to the third request voltage information, and outputs a current to the vehicle battery according to the request current information.

S324, the whole vehicle controller obtains the current information of the charging pile.

And S325, if the current information is smaller than or equal to the request current information, the whole vehicle controller controls the positive contactor and the negative contactor to be closed.

For example, if the current information is smaller than or equal to the request current information, it indicates that the current value in the loop between the current vehicle battery and the charging pile is smaller, and is within the safety range, at this time, the positive contactor and the negative contactor are closed, the influence on the loop current is generated, the components in the loop are not damaged, and after both the positive contactor and the negative contactor are closed, the vehicle battery can be charged.

S326, the whole vehicle controller sends power control release information to the direct current converter so that the charging pile charges the vehicle battery and controls the heating module to heat the vehicle battery again.

The power control cancellation information is used to cancel the limitation that the operating power of the dc converter is the power threshold.

The vehicle battery at the current temperature can be charged, but the vehicle battery still needs to be heated due to the lower temperature, so that the vehicle battery can be ensured to be charged normally, the power control of the direct current converter is released, the current loop current can be increased, the power of the heating module is increased, the temperature of the vehicle battery is continuously increased, the charging speed of the vehicle battery is increased, the charging efficiency is improved, and the charging time is shortened.

Based on the same inventive concept, the present disclosure also provides a vehicle battery heating device. Fig. 4 is a block diagram of a vehicle battery heating apparatus 400 provided in an exemplary embodiment of the present disclosure. Referring to fig. 4, the vehicle battery heating apparatus 400 may include:

A first sending module 401, configured to send a power limiting instruction to a dc converter of a vehicle battery when a vehicle is connected to a charging pile and both a positive contactor and a negative contactor of the vehicle battery are closed, where 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 obtaining module 402, configured to obtain a current output voltage of the charging pile in real time;

a first control module 403, configured to control the positive contactor and/or the negative contactor to be disconnected if the current output voltage is equal to a first request voltage information and a duration of the current output voltage equal to the first request voltage information reaches a preset duration;

And a second control module 404, configured to send power limitation cancellation information to the dc converter, and control the heating module of the vehicle battery to heat the vehicle battery, where the power limitation cancellation information is configured to cancel a limitation that the operating power of the dc converter is less than or equal to the power threshold.

Optionally, the apparatus 400 further includes:

A second obtaining module, configured to obtain vehicle state information of the vehicle before the first sending module 401 sends a power limiting instruction to the dc converter of the vehicle battery, where the vehicle state information includes a vehicle speed, vehicle charging failure state information, a current temperature of the vehicle battery, and heating failure state information of the heating module;

Optionally, the apparatus 400 further includes:

A second determining module, configured to determine, before the first obtaining module 402 obtains, in real time, a current output voltage of the charging pile, whether a second closing condition that both a positive charging relay and a negative charging relay of the vehicle battery are closed is satisfied, where the second closing condition includes that a current working power of the dc converter is less than or equal to the power threshold, and maximum output voltage information sent by the charging pile is received;

Optionally, the apparatus 400 further includes:

And a third sending module, configured to send a plurality of second request voltage information to the charging pile according to a preset sending frequency and according to a preset voltage difference value after the first control module 403 controls the positive contactor and/or the negative contactor to be disconnected, until the sent second request voltage information reaches a specified voltage, so that the charging pile outputs a voltage to the vehicle battery according to the plurality of second request voltage information, where the specified voltage is a voltage corresponding to a maximum power of the heating module at a current temperature of the vehicle battery, and an initial value in the plurality of second request voltage information is determined according to current voltage information of the vehicle battery.

Optionally, the apparatus 400 further includes:

A third obtaining module, configured to obtain 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;

Optionally, the apparatus 400 further includes:

The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.

Fig. 5 is a block diagram illustrating a vehicle battery heating apparatus 500 according to an exemplary embodiment. As shown in fig. 5, 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.

Wherein the processor 501 is configured to control the overall operation of the vehicle battery heating apparatus 500 to perform all or part of the steps of the vehicle battery heating method described above. The memory 502 is used to store various types of data to support operation of the vehicle battery heating device 500, which may include, for example, instructions for any application or method operating on the vehicle battery heating device 500, as well as application-related data, such as contact data, messages, pictures, audio, video, and the like. The Memory 502 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia component 503 may include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 502 or transmitted through the communication component 505. The audio assembly further comprises at least one speaker for outputting audio signals. The I/O interface 504 provides an interface between the processor 501 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication module 505 is used for wired or wireless communication between the vehicle battery heating apparatus 500 and other devices. Wireless Communication, such as Wi-Fi, bluetooth, near Field Communication (NFC) for short, 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or one or a combination of more of them, is not limited herein. The communication component 505 accordingly may comprise a Wi-Fi module, a bluetooth module, an NFC module, etc.

In an exemplary embodiment, the vehicle battery heating apparatus 500 may be implemented by one or more Application-specific integrated circuits (ASIC), digital signal processors (DIGITAL SIGNAL Processor, DSP), digital signal processing devices (DIGITAL SIGNAL Processing Device, DSPD), programmable logic devices (Programmable Logic Device, PLD), field programmable gate arrays (Field Programmable GATE ARRAY, FPGA), controllers, microcontrollers, microprocessors, or other electronic components for performing the vehicle battery heating method described above.

In another exemplary embodiment, a computer readable storage medium is also provided comprising program instructions which, when executed by a processor, implement the steps of the method of vehicle battery heating described above. For example, the computer readable storage medium may be the memory 502 including program instructions described above that are executable by the processor 501 of the vehicle battery heating apparatus 500 to perform the vehicle battery heating method described above.

In another exemplary embodiment, a computer program product is also provided, comprising a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-described method of vehicle battery heating when executed by the programmable apparatus.

The present disclosure also provides a vehicle including the vehicle battery heating device 400 provided by the present disclosure, or the present disclosure provides the vehicle battery heating device 500.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims

1. A method of heating a vehicle battery, the method comprising:

Acquiring the current output voltage of the charging pile in real time;

2. The method of claim 1, wherein prior to sending a power limit command to the dc converter of the vehicle battery, the method further comprises:

3. The method according to claim 2, wherein the determining whether a first closing condition for closing both the positive electrode contactor and the negative electrode contactor is satisfied according to the vehicle state information includes:

4. The method of claim 1, wherein prior to the step of obtaining the current output voltage of the charging pile in real time, the method further comprises:

5. The method of claim 4, wherein after controlling the positive charge relay and the negative charge relay to both close, the method further comprises:

6. The method according to claim 1, characterized in that after controlling the opening of the positive contactor and/or the negative contactor, the method further comprises:

7. The method of claim 1, wherein after controlling the heating module of the vehicle battery to heat the vehicle battery, the method further comprises:

acquiring the current temperature of the vehicle battery;

8. The method of claim 7, further comprising, after controlling the heating module to stop heating the vehicle battery:

Acquiring current information of the charging pile;

9. A vehicle battery heating apparatus, characterized in that the apparatus comprises:

10. A vehicle battery heating apparatus, characterized by comprising:

a memory having a computer program stored thereon;

A controller, the computer program implementing the steps of the method according to any of claims 1 to 8 when executed by the controller.

11. A non-transitory computer readable storage medium, having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the method according to any of claims 1-8.

12. A vehicle comprising the apparatus of claim 9 or the apparatus of claim 10.