Battery heating method, device and equipment

Abstract

The invention provides a battery heating method, device and equipment, and relates to the technical field of vehicle charging. The method comprises the following steps: acquiring the temperature, residual electric quantity and monomer temperature range of a battery in real time; under the condition that a first condition is met, first indication information is sent to a charging pile, and the first indication information is used for indicating to charge the battery at a first current frequency; when the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat. According to the scheme, under the condition that it is determined that the battery needs to be heated, the first indication information for charging the battery at the first current frequency is sent to the charging pile, so that the charging pile outputs the high-frequency current to the battery, and the battery is heated by heat generated by the internal resistance of the battery; and the heating efficiency is improved, and the battery is heated more uniformly. The problems that in the prior art, the battery heating effect is poor, and the efficiency is low are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle charging, and in particular to a battery heating method, device and equipment. Background Art

[0002] The charging speed of a vehicle is greatly affected by temperature. When the temperature is low, the charging speed of the vehicle drops significantly, which seriously affects the user experience of electric vehicles.

[0003] At present, low-temperature heating of battery packs is mainly carried out by heating film or liquid cooling. Whether heating the battery by heating film or liquid cooling, the battery is heated by heat exchange, the heating rate is low, and the temperature distribution is uneven. The effect of heating the battery is poor and the efficiency is low. Summary of the invention

[0004] The embodiments of the present invention provide a battery heating method, device and equipment to solve the problem of poor heating effect and low efficiency of the battery in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a battery heating method, which is applied to a battery management system, comprising:

[0007] Obtain the battery temperature, remaining power and cell temperature extremes in real time;

[0008] When the first condition is met, first indication information is sent to the charging pile, where the first indication information is used to instruct the battery to be charged at a first current frequency; when the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat;

[0009] The first condition includes:

[0010] When the temperature of the battery is greater than or equal to a first preset temperature and less than or equal to a second preset temperature;

[0011] The remaining power of the battery is greater than or equal to a first preset power and less than or equal to a second preset power;

[0012] When the monomer temperature extreme difference is less than or equal to the third preset temperature.

[0013] Furthermore, before obtaining the battery temperature, remaining power, and cell temperature extreme difference, the method further includes:

[0014] Obtain parameter configuration information of the charging pile;

[0015] The first condition also includes:

[0016] In the parameter configuration information, the maximum frequency of the output current of the charging pile is greater than the preset frequency.

[0017] Furthermore, the method further comprises:

[0018] Calculating a remaining charging time according to the first current frequency and the remaining power of the battery;

[0019] The remaining charging time is sent to the charging pile and the vehicle instrument controller.

[0020] Furthermore, the method further comprises:

[0021] When the second condition is met, second indication information is sent to the charging pile, where the second indication information is used to instruct the battery to be charged at a second current frequency; the second current frequency is less than the first current frequency, and when the battery is charged at the second current frequency, the heat generated by the internal resistance of the battery within a preset time period is less than the second heat;

[0022] The second condition includes one of the following:

[0023] The temperature of the battery is lower than the first preset temperature;

[0024] The temperature of the battery is greater than the second preset temperature;

[0025] The remaining battery power is less than the first preset power;

[0026] The remaining battery power is greater than the second preset power;

[0027] The charging duration for charging at the first current frequency is greater than or equal to the first duration;

[0028] The monomer temperature extreme difference is greater than a fourth preset temperature, and the fourth preset temperature is greater than the third preset temperature.

[0029] In a second aspect, an embodiment of the present invention provides a battery heating method, which is applied to a charging pile, comprising:

[0030] When receiving the first instruction information sent by the battery management system, outputting a current of a first current frequency to the battery to be charged;

[0031] When the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat.

[0032] Furthermore, the method further comprises:

[0033] Receiving a charging parameter message sent by the battery management system;

[0034] According to the charging parameter message, parameter configuration information of the charging pile is sent to the battery management system; the parameter configuration information includes the maximum frequency of the output current.

[0035] Furthermore, the method further comprises:

[0036] Receiving the remaining charging time sent by the battery management system;

[0037] The remaining charging time is displayed on the dashboard of the charging pile.

[0038] In a third aspect, an embodiment of the present invention provides a battery heating device, which is applied to a battery management system, including:

[0039] The acquisition module is used to obtain the battery temperature, remaining power and cell temperature extreme difference in real time;

[0040] a sending module, configured to send first indication information to a charging pile when a first condition is met, wherein the first indication information is used to indicate that the battery is charged at a first current frequency; when the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat;

[0041] The first condition includes:

[0042] When the temperature of the battery is greater than or equal to a first preset temperature and less than or equal to a second preset temperature;

[0043] The remaining power of the battery is greater than or equal to a first preset power and less than or equal to a second preset power;

[0044] When the monomer temperature extreme difference is less than or equal to the third preset temperature.

[0045] In a fourth aspect, an embodiment of the present invention provides a battery heating device applied to a charging pile, comprising:

[0046] an output module, configured to output a current of a first current frequency to the battery to be charged upon receiving first indication information sent by the battery management system;

[0047] When the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat.

[0048] In a fifth aspect, an embodiment of the present invention provides a battery heating device, comprising: a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the battery heating method described above are implemented.

[0049] The beneficial effects of the present invention are:

[0050] The battery heating method of the embodiment of the present invention can determine whether the battery needs to be heated when the battery is charged by obtaining the battery temperature, remaining power and cell temperature extreme difference in real time; and when it is determined that the battery needs to be heated, the first instruction information for charging the battery at a first current frequency is sent to the charging pile, so that the charging pile outputs a high-frequency current to the battery, so that the heat generated by the internal resistance of the battery heats the battery, thereby improving the heating efficiency and making the heating of the battery more uniform. The problem of poor effect and low efficiency of battery heating in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram showing the steps of a battery heating method applied to a battery management system according to an embodiment of the present invention;

[0052] Figure 2 A schematic diagram showing the steps of a battery heating method applied to a charging pile according to an embodiment of the present invention;

[0053] Figure 3 A schematic diagram showing the structure of a battery heating device applied to a battery management system according to an embodiment of the present invention;

[0054] Figure 4 A schematic diagram showing the structure of a battery heating device applied to a charging pile according to an embodiment of the present invention;

[0055] Figure 5 A schematic structural diagram of a battery heating device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0056] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present invention. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. In addition, for clarity and brevity, the description of known functions and structures is omitted.

[0057] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0058] The present invention aims to solve the problem that the heating effect of a battery in the prior art is poor and the efficiency is low, and provides a battery heating method, device and equipment.

[0059] It should be noted that the internal resistance of the battery is larger under low temperature conditions, and when the charging current frequency is higher, the current threshold for battery lithium deposition is larger. According to this principle, during DC charging, the DC charging pile outputs pulses to charge and discharge the battery, and uses the battery's internal resistance to generate heat to heat the battery pack, that is, the power battery's rapid heating function during DC charging.

[0060] like Figure 1 As shown, an embodiment of the present invention provides a battery heating method, which is applied to a battery management system, comprising the following steps:

[0061] Step 101, obtaining the battery temperature, remaining power and cell temperature extreme difference in real time;

[0062] Step 102: When a first condition is met, first indication information is sent to a charging pile, where the first indication information is used to instruct the battery to be charged at a first current frequency; when the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat;

[0063] The first condition includes:

[0064] When the temperature of the battery is greater than or equal to a first preset temperature and less than or equal to a second preset temperature;

[0065] The remaining power of the battery is greater than or equal to a first preset power and less than or equal to a second preset power;

[0066] When the monomer temperature extreme difference is less than or equal to the third preset temperature.

[0067] In the embodiment of the present invention, the first preset temperature is a battery pulse speed heating turn-on temperature threshold, for example, -20°C to 5°C; the first preset temperature is a battery pulse speed heating turn-off temperature threshold, for example, 5°C;

[0068] The first preset power is the SOC lower limit for enabling the battery pulse speed heating, such as 5%; the first preset power is the SOC upper limit for enabling the battery pulse speed heating, such as 80%;

[0069] The third preset temperature is less than or equal to 13°C.

[0070] In this embodiment of the present invention, the first current frequency is a pulse current of 0x01.

[0071] The battery heating method of the embodiment of the present invention can determine whether the battery needs to be heated when the battery is charged by obtaining the battery temperature, remaining power and cell temperature extreme difference in real time; and when it is determined that the battery needs to be heated, the first instruction information for charging the battery at a first current frequency is sent to the charging pile, so that the charging pile outputs a high-frequency current to the battery, so that the heat generated by the internal resistance of the battery heats the battery, thereby improving the heating efficiency and making the heating of the battery more uniform. The problem of poor effect and low efficiency of battery heating in the prior art is solved.

[0072] Optionally, before obtaining the battery temperature, remaining power, and cell temperature extreme difference, the method further includes:

[0073] Obtain parameter configuration information of the charging pile;

[0074] The first condition also includes:

[0075] In the parameter configuration information, the maximum frequency of the output current of the charging pile is greater than the preset frequency.

[0076] The battery heating method of the embodiment of the present invention obtains parameter configuration information of the charging pile including a maximum output capacity message, and determines whether the charging pile is capable of charging the battery at a first current frequency according to the parameter configuration information; when it is determined that the charging pile is capable of charging the battery at the first current frequency, the battery is charged, and then the battery is heated by the heat generated by the internal resistance.

[0077] Optionally, the method further comprises:

[0078] Calculating a remaining charging time according to the first current frequency and the remaining power of the battery;

[0079] The remaining charging time is sent to the charging pile and the vehicle instrument controller.

[0080] The battery heating method of the embodiment of the present invention can display the remaining charging time on the dashboard of the vehicle by calculating the remaining charging time and sending the remaining charging time to the instrument controller of the vehicle, thereby improving the user's charging experience.

[0081] Optionally, the method further comprises:

[0082] When the second condition is met, second indication information is sent to the charging pile, where the second indication information is used to instruct the battery to be charged at a second current frequency; the second current frequency is less than the first current frequency, and when the battery is charged at the second current frequency, the heat generated by the internal resistance of the battery within a preset time period is less than the second heat;

[0083] The second condition includes one of the following:

[0084] The temperature of the battery is lower than the first preset temperature;

[0085] The temperature of the battery is greater than the second preset temperature;

[0086] The remaining battery power is less than the first preset power;

[0087] The remaining battery power is greater than the second preset power;

[0088] The charging duration for charging at the first current frequency is greater than or equal to the first duration;

[0089] The monomer temperature extreme difference is greater than a fourth preset temperature, and the fourth preset temperature is greater than the third preset temperature.

[0090] In the embodiment of the present invention, the first time length is the maximum time limit of pulse heating, for example, 15 minutes;

[0091] The fourth preset temperature is greater than or equal to 15°C.

[0092] In the embodiment of the present invention, charging the battery with the second current frequency is normal charging of the battery;

[0093] The second current frequency is a pulse current of 0x00.

[0094] The battery heating method of the embodiment of the present invention can automatically exit the charging state after heating is completed during the process of charging the battery through the first current frequency to heat the battery, thereby improving the battery heating efficiency while ensuring the battery charging efficiency.

[0095] like Figure 2 As shown, an embodiment of the present invention provides a battery heating method, which is applied to a charging pile, comprising the following steps:

[0096] Step 201, upon receiving first instruction information sent by a battery management system, outputting a current of a first current frequency to a battery to be charged;

[0097] When the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat.

[0098] Optionally, the method further comprises:

[0099] Receiving a charging parameter message sent by the battery management system;

[0100] According to the charging parameter message, parameter configuration information of the charging pile is sent to the battery management system; the parameter configuration information includes the maximum frequency of the output current.

[0101] Optionally, the method further comprises:

[0102] Receiving the remaining charging time sent by the battery management system;

[0103] The remaining charging time is displayed on the dashboard of the charging pile.

[0104] The battery heating method of the embodiment of the present invention is as follows:

[0105] Vehicle Data Center (VDC): Based on the user's plug-in status and the status of the charging pile, the vehicle is guided into the fast-charging high-voltage state by powering on and off.

[0106] Battery Management System (BMS): 1. Based on the category information of the DC charging pile, the BMS determines whether to perform rapid heating status identification; 2. Based on the lowest temperature of the battery cell, the remaining power of the power battery (State Of Charge, SOC) and other conditions, it is comprehensively judged whether the vehicle needs the DC charging pile to output pulse current for rapid heating; 3. Based on the high-voltage state of the vehicle, the vehicle mode, and the maximum output capacity message CML configured with the DC charging pile parameters, it is judged that the vehicle is about to enter the working stage; 4. During the fast charging preheating and fast charging process, the BMS determines its own state and meets certain conditions; 5. In the rapid heating stage at the pile end, the BMS estimates the battery SOC and available capacity based on the power consumption of rapid heating;

[0107] DC charging pile: 1. Periodically send the type of charging pile to clarify whether it supports the quick heating function; 2. After completing the interaction with the BMS, configure and feedback the CML parameter status according to the charging parameter message sent by the BMS; 3. After receiving the 0x01 pulse heating indication sent by the BMS, guide it into the pulse quick heating interaction process; perform pulse heating according to the relevant battery demand parameters, and feedback the charging status of the charging pile; 4. The DC charging pile sends the information related to the quick heating process to the charging pile instrument controller by receiving the estimated remaining charging time and other signals sent by the BMS, ensuring that the information related to the quick heating function is displayed on it;

[0108] Charging pile instrument controller: receives information such as estimated remaining charging time, and ensures that information related to the rapid heating function is displayed on the charging pile instrument panel;

[0109] Instrument Controller: Receives information such as estimated remaining charging time to ensure that information related to the rapid heating function is displayed on the vehicle instrument panel.

[0110] like Figure 3 As shown, the embodiment of the present invention further provides a battery heating device 300, which is applied to a battery management system, including:

[0111] An acquisition module 301 is used to acquire the temperature, remaining power and cell temperature range of the battery in real time;

[0112] The sending module 302 is used to send first indication information to the charging pile when a first condition is met, wherein the first indication information is used to indicate that the battery is charged at a first current frequency; when the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat;

[0113] The first condition includes:

[0114] When the temperature of the battery is greater than or equal to a first preset temperature and less than or equal to a second preset temperature;

[0115] The remaining power of the battery is greater than or equal to a first preset power and less than or equal to a second preset power;

[0116] When the monomer temperature extreme difference is less than or equal to the third preset temperature.

[0117] The battery heating device of the embodiment of the present invention can determine whether the battery needs to be heated when the battery is charged by obtaining the battery temperature, remaining power and cell temperature extreme difference in real time; and when it is determined that the battery needs to be heated, the first instruction information for charging the battery at a first current frequency is sent to the charging pile, so that the charging pile outputs a high-frequency current to the battery, so that the heat generated by the internal resistance of the battery heats the battery, thereby improving the heating efficiency and making the heating of the battery more uniform. The problem of poor heating effect and low efficiency of the battery in the prior art is solved.

[0118] like Figure 4 As shown, the embodiment of the present invention further provides a battery heating device 400, which is applied to a charging pile, comprising:

[0119] The output module 401 is used to output a current of a first current frequency to the battery to be charged when receiving the first instruction information sent by the battery management system;

[0120] When the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat.

[0121] like Figure 5 As shown, the embodiment of the present application also provides a battery heating device 500, including a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the computer program is executed by the processor 501, the various processes of the above-mentioned certificate management method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0122] In addition, a specific embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the steps of the above-mentioned battery heating method are implemented. And the same technical effect can be achieved, so it will not be repeated here to avoid repetition.

[0123] The embodiment of the present application also provides a computer program product, including computer instructions. When the computer instructions are executed by a processor, the various processes of the above-mentioned battery heating method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, they are not described here.

[0124] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications are also within the scope of protection of the present invention.

Claims

1. A battery heating method, applied to a battery management system, characterized in that: include: Obtain the battery temperature, remaining power and cell temperature extremes in real time; When the first condition is met, first indication information is sent to the charging pile, where the first indication information is used to instruct the battery to be charged at a first current frequency; when the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat; The first condition includes: When the temperature of the battery is greater than or equal to a first preset temperature and less than or equal to a second preset temperature; The remaining power of the battery is greater than or equal to a first preset power and less than or equal to a second preset power; When the monomer temperature extreme difference is less than or equal to the third preset temperature.

2. The battery heating method according to claim 1, characterized in that: Before obtaining the battery temperature, remaining power, and cell temperature extremes, the following is also included: Obtain parameter configuration information of the charging pile; The first condition also includes: In the parameter configuration information, the maximum frequency of the output current of the charging pile is greater than the preset frequency.

3. The battery heating method according to claim 1, characterized in that: The method further comprises: Calculating a remaining charging time according to the first current frequency and the remaining power of the battery; The remaining charging time is sent to the charging pile and the vehicle instrument controller.

4. The battery heating method according to claim 1, characterized in that: The method further comprises: When the second condition is met, second indication information is sent to the charging pile, where the second indication information is used to instruct the battery to be charged at a second current frequency; the second current frequency is less than the first current frequency, and when the battery is charged at the second current frequency, the heat generated by the internal resistance of the battery within a preset time period is less than the second heat; The second condition includes one of the following: The temperature of the battery is lower than the first preset temperature; The temperature of the battery is greater than the second preset temperature; The remaining battery power is less than the first preset power; The remaining battery power is greater than the second preset power; The charging duration for charging at the first current frequency is greater than or equal to the first duration; The monomer temperature extreme difference is greater than a fourth preset temperature, and the fourth preset temperature is greater than the third preset temperature.

5. A battery heating method, applied to a charging pile, characterized in that: include: When receiving the first instruction information sent by the battery management system, outputting a current of a first current frequency to the battery to be charged; When the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat.

6. The battery heating method according to claim 5, characterized in that: The method further comprises: Receiving a charging parameter message sent by the battery management system; According to the charging parameter message, parameter configuration information of the charging pile is sent to the battery management system; the parameter configuration information includes the maximum frequency of the output current.

7. The battery heating method according to claim 5, characterized in that: The method further comprises: Receiving the remaining charging time sent by the battery management system; The remaining charging time is displayed on the dashboard of the charging pile.

8. A battery heating device, applied to a battery management system, characterized in that: include: The acquisition module is used to obtain the battery temperature, remaining power and cell temperature extreme difference in real time; a sending module, configured to send first indication information to a charging pile when a first condition is met, wherein the first indication information is used to indicate that the battery is charged at a first current frequency; when the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat; The first condition includes: When the temperature of the battery is greater than or equal to a first preset temperature and less than or equal to a second preset temperature; The remaining power of the battery is greater than or equal to a first preset power and less than or equal to a second preset power; When the monomer temperature extreme difference is less than or equal to the third preset temperature.

9. A battery heating device, applied to a charging pile, characterized in that: include: an output module, configured to output a current of a first current frequency to the battery to be charged upon receiving first indication information sent by the battery management system; When the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery within a preset time period is greater than the first heat.

10. A battery heating device, comprising: A transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the battery heating method according to any one of claims 1 to 7 when executing the computer program.

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