A battery heating method, apparatus, and device

Abstract

This invention provides a battery heating method, apparatus, and device, relating to the field of vehicle charging technology. The method includes real-time acquisition of the battery's temperature, remaining charge, and individual cell temperature range; under a first condition, sending a first instruction to a charging pile, the first instruction indicating charging the battery at a first current frequency; and ensuring that, during charging at the first current frequency, the heat generated by the battery's internal resistance exceeds a first heat level within a preset time period. The solution of this invention, upon determining that battery heating is necessary, sends a first instruction to the charging pile to charge the battery at a first current frequency, causing the charging pile to output a high-frequency current to the battery, thereby heating the battery with the heat generated by its internal resistance, improving heating efficiency and providing more uniform heating. This solves the problems of poor heating effect and low efficiency in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of vehicle charging technology, and in particular to a battery heating method, apparatus, and equipment. Background Technology

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

[0003] Currently, low-temperature heating of battery packs mainly relies on heating films or liquid cooling. Both methods heat the battery through heat exchange, resulting in a low heating rate and uneven temperature distribution. This leads to poor heating efficiency. Summary of the Invention

[0004] This invention provides a battery heating method, apparatus, and device to solve the problems of poor heating effect and low efficiency in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] In a first aspect, embodiments of the present invention provide a battery heating method applied to a battery management system, comprising:

[0007] Real-time monitoring of battery temperature, remaining charge, and individual cell temperature range;

[0008] If the first condition is met, a first instruction message is sent to the charging pile. The first instruction message 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 is greater than the first heat within a preset time period.

[0009] The first condition includes:

[0010] 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 the first preset power and less than or equal to the second preset power;

[0012] When the temperature difference of the individual cells is less than or equal to the third preset value.

[0013] Furthermore, before obtaining the battery's temperature, remaining capacity, and individual cell temperature range, the following steps are also included:

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

[0015] The first condition also includes:

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

[0017] Furthermore, the method also includes:

[0018] Calculate the remaining charging time based on the first current frequency and the remaining battery capacity;

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

[0020] Furthermore, the method also includes:

[0021] If the second condition is met, a second instruction message is sent to the charging pile. The second instruction message 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 is less than the second heat within a preset time period.

[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 battery power.

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

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

[0028] The temperature difference of the individual cells is greater than a fourth preset value, and the fourth preset value is greater than the third preset value.

[0029] In a second aspect, embodiments of the present invention provide a battery heating method applied to a charging pile, comprising:

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

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

[0032] Furthermore, the method also includes:

[0033] Receive charging parameter messages sent by the battery management system;

[0034] Based on the charging parameter message, the 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 also includes:

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

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

[0038] Thirdly, embodiments of the present invention provide a battery heating device applied to a battery management system, comprising:

[0039] The acquisition module is used to acquire the battery's temperature, remaining power, and individual cell temperature range in real time.

[0040] The sending module is used to send first indication information to the charging pile when a first condition is met. 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 is greater than the first heat within a preset time period.

[0041] The first condition includes:

[0042] 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 the first preset power and less than or equal to the second preset power;

[0044] When the temperature difference of the individual cells is less than or equal to the third preset value.

[0045] Fourthly, embodiments of the present invention provide a battery heating device applied to a charging pile, comprising:

[0046] The output module is used to output a current at a first current frequency to the battery to be charged upon receiving a first indication information sent by the battery management system.

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

[0048] Fifthly, embodiments of the present invention provide 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, it implements the steps of the battery heating method as described above.

[0049] The beneficial effects of this invention are:

[0050] The battery heating method of this invention, by acquiring real-time data on the battery's temperature, remaining charge, and individual cell temperature differences, can determine whether battery heating is necessary while the battery is being charged. If heating is required, a first instruction is sent to the charging station to charge the battery at a first current frequency. This allows the charging station to output a high-frequency current to the battery, using the heat generated by the battery's internal resistance to heat it, thus improving heating efficiency and providing more uniform heating. This solves the problems of poor heating effect and low efficiency in existing battery heating technologies. Attached Figure Description

[0051] Figure 1 A schematic diagram illustrating 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 illustrating the steps of a battery heating method applied to a charging pile according to an embodiment of the present invention;

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

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

[0055] Figure 5 This is a schematic diagram illustrating the structure of a battery heating device according to an embodiment of the present invention. Detailed Implementation

[0056] To make the technical problems, technical solutions, and advantages of this invention clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as particular configurations and components are provided merely to aid in a comprehensive understanding of the embodiments of this invention. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this invention. Furthermore, for clarity and brevity, descriptions of known functions and structures have been omitted.

[0057] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0058] This invention addresses the problem of poor heating effect and low efficiency of existing battery heating technologies by providing a battery heating method, apparatus, and device.

[0059] It should be noted that the internal resistance of the battery is relatively large at low temperatures, and the current threshold for lithium plating in the battery is larger when the charging current frequency is higher. Based on this principle, during DC charging, the battery is charged and discharged by outputting pulses through the DC charging pile, and the battery pack is heated by the heat generated by the internal resistance of the battery, which is the rapid heating function of the power battery during DC charging.

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

[0061] Step 101: Real-time acquisition of battery temperature, remaining charge, and individual cell temperature range;

[0062] Step 102: If the first condition is met, send a first instruction message to the charging pile. The first instruction message 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 is greater than the first heat within a preset time period.

[0063] The first condition includes:

[0064] 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 the first preset power and less than or equal to the second preset power;

[0066] When the temperature difference of the individual cells is less than or equal to the third preset value.

[0067] In this embodiment of the invention, the first preset temperature is the battery pulse rate heating start temperature threshold, for example, -20°C to 5°C; the first preset temperature is the battery pulse rate heating stop temperature threshold, for example, 5°C.

[0068] The first preset battery level is the lower limit of the State of Charge (SOC) that allows the battery pulse rate heating to be turned on, for example, 5%; the first preset battery level is the upper limit of the SOC that allows the battery pulse rate heating to be turned off, for example, 80%.

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

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

[0071] The battery heating method of this invention, by acquiring real-time data on the battery's temperature, remaining charge, and individual cell temperature differences, can determine whether battery heating is necessary while the battery is being charged. If heating is required, a first instruction is sent to the charging station to charge the battery at a first current frequency. This allows the charging station to output a high-frequency current to the battery, using the heat generated by the battery's internal resistance to heat it, thus improving heating efficiency and providing more uniform heating. This solves the problems of poor heating effect and low efficiency in existing battery heating technologies.

[0072] Optionally, before obtaining the battery temperature, remaining capacity, and individual cell temperature range, the following steps are also included:

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

[0074] The first condition also includes:

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

[0076] The battery heating method of this 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 based on the parameter configuration information; if it is determined that the charging pile can charge the battery at the first current frequency, the battery is charged, and the heat generated by the internal resistance is used to heat the battery.

[0077] Optionally, the method further includes:

[0078] Calculate the remaining charging time based on the first current frequency and the remaining battery capacity;

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

[0080] The battery heating method of this invention calculates the remaining charging time and sends the remaining charging time to the vehicle's instrument controller, enabling the remaining charging time to be displayed on the vehicle's instrument panel, thereby improving the user's charging experience.

[0081] Optionally, the method further includes:

[0082] If the second condition is met, a second instruction message is sent to the charging pile. The second instruction message 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 is less than the second heat within a preset time period.

[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 battery power.

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

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

[0089] The temperature difference of the individual cells is greater than a fourth preset value, and the fourth preset value is greater than the third preset value.

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

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

[0092] In this embodiment of the invention, charging the battery at the second current frequency is considered normal charging of the battery;

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

[0094] The battery heating method of this invention can automatically exit the charging state after the battery is heated by charging it with a first current frequency, thereby improving the battery heating efficiency while ensuring the battery charging efficiency.

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

[0096] Step 201: Upon receiving the first instruction information sent by the battery management system, output a current at the first current frequency to the battery to be charged.

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

[0098] Optionally, the method further includes:

[0099] Receive charging parameter messages sent by the battery management system;

[0100] Based on the charging parameter message, the 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 includes:

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

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

[0104] The battery heating method of this invention is as follows:

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

[0106] Battery Management System (BMS): 1. Based on the type of DC charging station, the BMS determines whether to perform rapid heating status identification; 2. Based on the minimum temperature of individual battery cells and the remaining state of charge (SOC) of the power battery, the BMS comprehensively judges whether the vehicle needs to output pulse current from the DC charging station for rapid heating; 3. Based on the vehicle's high voltage status, vehicle mode, and the maximum output capacity message CML configured with the DC charging station parameters, the BMS determines whether the vehicle is about to enter a working phase; 4. During fast charging preheating and fast charging, the BMS judges its own status and meets certain conditions; 5. During the rapid heating stage at the charging station, 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 indicate whether it supports fast heating function; 2. After completing the identification interaction with BMS, configure and feedback the CML parameter status according to the charging parameter message sent by BMS; 3. After receiving the 0x01 pulse heating indication sent by BMS, guide into the pulse fast heating interaction process; perform pulse heating according to relevant battery requirement parameters, and feedback the charging pile's relevant charging status; 4. The DC charging pile receives signals such as the estimated remaining charging time sent by BMS and sends relevant information about the fast heating process to the charging pile instrument controller to ensure that the fast heating function information is displayed on the screen;

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

[0109] Instrument controller: Receives information such as estimated remaining charging time and ensures that information related to the quick-heating function is displayed on the vehicle's instrument panel.

[0110] like Figure 3 As shown, this embodiment of the invention also provides a battery heating device 300, applied to a battery management system, comprising:

[0111] The acquisition module 301 is used to acquire the battery temperature, remaining power, and individual cell temperature range 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. 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 is greater than the first heat within a preset time period.

[0113] The first condition includes:

[0114] 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 the first preset power and less than or equal to the second preset power;

[0116] When the temperature difference of the individual cells is less than or equal to the third preset value.

[0117] The battery heating device of this invention, by acquiring real-time data on the battery's temperature, remaining charge, and individual cell temperature differences, can determine whether battery heating is necessary while the battery is being charged. If heating is required, it sends a first instruction to the charging station to charge the battery at a first current frequency. This allows the charging station to output a high-frequency current to the battery, using the heat generated by the battery's internal resistance to heat it, thus improving heating efficiency and providing more uniform heating. This solves the problems of poor heating effect and low efficiency in existing technologies.

[0118] like Figure 4 As shown, this embodiment of the invention also provides a battery heating device 400, 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 it receives a first instruction information sent by the battery management system.

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

[0121] like Figure 5 As shown, this application embodiment 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, it implements the various processes of the above-described certificate management method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0122] In addition, specific embodiments of the present invention also provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described battery heating method. This achieves the same technical effect, and to avoid repetition, will not be described further here.

[0123] This application also provides a computer program product, including computer instructions. When executed by a processor, the computer instructions implement the various processes of the above-described battery heating method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0124] The above describes the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and 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: Real-time monitoring of battery temperature, remaining charge, and individual cell temperature range; If the first condition is met, a first instruction message is sent to the charging pile. The first instruction message 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 is greater than the first heat within a preset time period. The first condition includes: 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 the first preset power and less than or equal to the second preset power; The temperature range of the individual cells is less than or equal to a third preset value; If the second condition is met, a second instruction message is sent to the charging pile. The second instruction message 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 is less than the second heat within a preset time period. 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 level; The remaining battery power is greater than the second preset power level; The charging duration at the first current frequency is greater than or equal to the first duration; The temperature difference of the individual cells is greater than a fourth preset value, and the fourth preset value is greater than the third preset value.

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

3. The battery heating method according to claim 1, characterized in that, The method further includes: Calculate the remaining charging time based on the first current frequency and the remaining battery capacity; The remaining charging time is sent to the charging station and the vehicle instrument controller.

4. A battery heating method, applied to a charging pile, characterized in that, include: Upon receiving the first instruction information sent by the battery management system, a current of the first current frequency is output to the battery to be charged; The first indication information is sent by the battery management system when it detects that a first condition is met, and the first condition includes: The battery temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature; The remaining power of the battery is greater than or equal to the first preset power and less than or equal to the second preset power; The temperature difference between individual battery cells is less than or equal to the third preset value; Wherein, when the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery is greater than the first heat within a preset time period. Upon receiving the second instruction information sent by the battery management system, a current at the second current frequency is output to the battery to be charged; The second current frequency is less than the first current frequency; When the battery is charged at the second current frequency, the heat generated by the internal resistance of the battery is less than the second heat within a preset time period. The second indication information is sent by the battery management system when it detects that a second condition is met, and 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 level; The remaining battery power is greater than the second preset power level; The charging duration at the first current frequency is greater than or equal to the first duration; The temperature difference of the individual cells is greater than a fourth preset value, and the fourth preset value is greater than the third preset value.

5. The battery heating method according to claim 4, characterized in that, The method further includes: Receive charging parameter messages sent by the battery management system; Based on the charging parameter message, the 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.

6. The battery heating method according to claim 4, characterized in that, The method further includes: Receive the remaining charging time sent by the battery management system; The remaining charging time is displayed on the dashboard of the charging station.

7. A battery heating device, applied to a battery management system, characterized in that, include: The acquisition module is used to acquire the battery's temperature, remaining power, and individual cell temperature range in real time. The sending module is used to send first indication information to the charging pile when a first condition is met. 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 is greater than the first heat within a preset time period. The first condition includes: 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 the first preset power and less than or equal to the second preset power; The temperature range of the individual cells is less than or equal to a third preset value; Under the condition that the second condition is met, a second instruction message is sent to the charging pile. The second instruction message 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 is less than the second heat within a preset time period. The second condition includes one of the following: the temperature of the battery is less than the first preset temperature; the temperature of the battery is greater than the second preset temperature; the remaining battery capacity is less than the first preset capacity; the remaining battery capacity is greater than the second preset capacity; the charging time at the first current frequency is greater than or equal to the first time; the temperature difference of the individual cells is greater than a fourth preset value, and the fourth preset value is greater than the third preset value.

8. A battery heating device, applied to a charging pile, characterized in that, include: The output module is configured to output a current at a first current frequency to the battery to be charged upon receiving a first instruction information sent by the battery management system, and is also configured to output a current at a second current frequency to the battery to be charged upon receiving a second instruction information sent by the battery management system. The first indication information is sent by the battery management system when it detects that a first condition is met, and the first condition includes: The battery temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature; The remaining power of the battery is greater than or equal to the first preset power and less than or equal to the second preset power; The temperature difference between individual battery cells is less than or equal to the third preset value; Wherein, when the battery is charged at the first current frequency, the heat generated by the internal resistance of the battery is greater than the first heat within a preset time period. The second current frequency is less than the first current frequency. When the second current frequency charges the battery, the heat generated by the internal resistance of the battery within a preset time period is less than the second heat. The second indication information is sent by the battery management system when it detects that a second condition is met, and 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 level; The remaining battery power is greater than the second preset power level; The charging duration at the first current frequency is greater than or equal to the first duration; The temperature difference of the individual cells is greater than a fourth preset value, and the fourth preset value is greater than the third preset value.

9. A battery heating device, comprising: A transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the steps of the battery heating method as described in any one of claims 1 to 6.

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