Electric vehicle battery charging method, storage medium, electronic equipment and vehicle

Abstract

The invention discloses an electric vehicle battery charging method which comprises the following steps: in response to a charging instruction, acquiring current vehicle information, detecting the starting state of a heater, and if the starting state of the heater is open, acquiring a standard charging ampere meter comprising a plurality of interval groups and a safety current coefficient table, determining a safe charging current according to the current vehicle information, the standard charging ammeter and the safe current coefficient table, and finally charging the battery by using the safe charging current. According to the invention, on the premise that the safety of the battery is ensured, the battery can be charged at the maximum power when APTC heating is started, APTC heating at all gears can be met, the situation that charging is slow and even charging power failure occurs under the condition of extremely low temperature of a client is avoided, meanwhile, other devices do not need to be added, and the cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field related to new energy vehicles, and in particular to an electric vehicle battery charging method, storage medium and electronic equipment. Background Art

[0002] In the winter heating design of new energy vehicles, APTC (positive temperature coefficient air heater) technology is generally used to implement efficient temperature management of the vehicle. However, in extremely low temperature environments, when the vehicle must perform plug-in charging and use warm air conditioning at the same time, there will be certain risks. When the requested charging current is superimposed on the rated current of APTC, a square wave current of a certain frequency will rush back into the battery pack, causing the battery to overcharge, and then inducing the risk of lithium plating.

[0003] Existing technologies generally choose between charging and turning on the heater to protect the safety of the battery pack, or use WPTC (positive temperature coefficient water heater) and multiple power module IGBTs for multi-speed control to control the ripple backwash current within a smaller range, thereby effectively reducing the risk of battery overcharging, but this is costly.

[0004] Therefore, it is necessary to provide an electric vehicle battery charging method, storage medium and electronic device that can turn on the heater while charging and protect the safety of the battery pack by controlling the charging current. Summary of the invention

[0005] The purpose of the present application is to overcome the problem in the prior art that the heating cannot be turned on while charging using APTC, and to provide an electric vehicle battery charging method, storage medium and electronic device.

[0006] The technical solution of the present application provides a method for charging an electric vehicle battery, comprising:

[0007] In response to the charging instruction, obtaining current vehicle information;

[0008] Detecting the heater on state, and if the heater on state is on, obtaining a standard charging current table and a safety current factor table;

[0009] A safe charging current is determined according to the current vehicle information, the standard charging current table and the safety current factor table, and the battery is charged using the safe charging current.

[0010] Further, the current vehicle information includes: current battery core temperature, current power and current heating duty cycle;

[0011] The standard charging current table includes standard charging currents of multiple interval groups, the safety current coefficient table includes safety current coefficients of multiple interval groups, and the interval groups include battery cell temperature intervals and power intervals;

[0012] The determining of the safe charging current according to the current vehicle information, the standard charging current table and the safety current coefficient table specifically includes:

[0013] Determine the current standard charging current in the standard charging current table according to the current battery core temperature and the current power;

[0014] Determine a current safety current coefficient in the safety current coefficient table according to the current battery core temperature and the current power;

[0015] The safe charging current is determined according to the current standard charging current, the current safety current factor and the current heating duty cycle.

[0016] The determining of the safe charging current according to the current standard charging current, the current safety current coefficient and the current heating duty cycle specifically includes:

[0017] Determine the safe charging current according to the following formula:

[0018] I1=I0×(K1-n)X / K2

[0019] Among them, I1 is the safe charging current, I0 is the current standard charging current, n is the current heating duty cycle, X is the current safety current coefficient, K1 is the first constant, and K2 is the second constant.

[0020] Furthermore, after detecting the heater on state, the method further comprises:

[0021] If the heater is turned off, a standard charging current table is obtained, a safe charging current is determined according to the current vehicle information and the standard charging current table, and the battery is charged with the safe charging current.

[0022] The technical solution of the present application also provides a method for determining a safety current coefficient, including:

[0023] The maximum current generated by the heater is taken as the maximum heater current;

[0024] Performing a test operation on each of the interval groups in the standard charging current table to obtain the safety current coefficients of the multiple interval groups, the standard charging current table including the standard charging current of the multiple interval groups, the interval groups including the battery cell temperature interval and the power interval;

[0025] The safety current factors of a plurality of the interval groups are combined into the safety current factor table.

[0026] Furthermore, the testing operation includes:

[0027] Select a current coefficient to be measured, and multiply the standard charging current of the interval group by the current coefficient to be measured to obtain the charging current to be measured;

[0028] Performing a charging test on the battery to be tested by superimposing the charging current to be tested and the maximum current of the heater;

[0029] Determine whether there is a safety risk based on the charging test result. If there is a safety risk, select another current coefficient to be tested and perform the test operation again. Otherwise, use the current coefficient to be tested when there is no safety risk as the safety current coefficient of the interval group and end the test operation.

[0030] Furthermore, the testing operation includes:

[0031] Select a current coefficient to be measured, and multiply the standard charging current of the interval group by the current coefficient to be measured to obtain the charging current to be measured;

[0032] The battery to be tested is charged and discharged by using the charging current to be tested and superimposed with the maximum current of the heater;

[0033] After a preset number of charge and discharge cycles, the battery cells of the battery to be tested are disassembled, and it is determined whether there is a safety risk based on the battery cell condition. If there is a safety risk, another current coefficient to be tested is selected and the test operation is performed again. Otherwise, the current coefficient to be tested when there is no safety risk is used as the safe current coefficient of the interval group and the test operation is terminated.

[0034] The technical solution of the present application also provides a storage medium, which stores computer instructions. When a computer executes the computer instructions, it is used to execute the electric vehicle battery charging method as described above.

[0035] The technical solution of the present application also provides an electronic device, comprising at least one processor; and

[0036] a memory communicatively connected to the at least one processor; wherein,

[0037] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the electric vehicle battery charging method as described above.

[0038] The technical solution of the present application also provides a vehicle, which includes a vehicle body and the electronic device as described above installed on the vehicle body.

[0039] After adopting the above technical solution, the following beneficial effects are achieved:

[0040] The present application discloses an electric vehicle battery charging method, which responds to a charging instruction, obtains the current vehicle information, and detects the heater on state. If the heater is on, a standard charging current table and a safety current coefficient table including multiple interval groups are obtained, and the safe charging current is determined according to the current vehicle information, the standard charging current table and the safety current coefficient table, and finally the battery is charged with the safe charging current. Under the premise of ensuring battery safety, the battery can be charged at maximum power when APTC heating is turned on, and APTC heating at all gears can be met, avoiding the situation where customers charge slowly or even lose power during charging at extremely low temperatures, and no other devices need to be added, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The disclosure of the present application will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. In the drawings:

[0042] Figure 1 is a flowchart of a method for charging an electric vehicle battery in one embodiment of the present application;

[0043] Figure 2 is a flowchart of a method for charging an electric vehicle battery in another embodiment of the present application;

[0044] Figure 3 is a flowchart of a method for determining a safety current coefficient in an embodiment of the present application;

[0045] Figure 4 is a flowchart of a method for determining a safety current coefficient in another embodiment of the present application;

[0046] Figure 5 is a flowchart of a method for determining a safety current coefficient in another embodiment of the present application;

[0047] Figure 6 It is a schematic diagram of the hardware structure of an electronic device in one embodiment of the present application. DETAILED DESCRIPTION

[0048] The specific implementation of the present application is further described below with reference to the accompanying drawings.

[0049] It is easy to understand that according to the technical solution of the present application, without changing the essential spirit of the present application, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as the entirety of the present application or as a limitation or restriction on the technical solution of the application.

[0050] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above-mentioned in this application can be understood according to the specific circumstances.

[0052] like Figure 1 As shown, a working flow chart of an electric vehicle battery charging method in one embodiment of the present application includes:

[0053] Step S101: Responding to a charging instruction, obtaining current vehicle information;

[0054] Step S102: Detecting the heater on state, if the heater on state is on, obtaining a standard charging current table and a safety current coefficient table;

[0055] Step S103: Determine a safe charging current according to the current vehicle information, the standard charging current table and the safety current coefficient table, and use the safe charging current to charge the battery.

[0056] Specifically, in step S101, if a charging instruction is received, the current vehicle information is obtained, wherein the current vehicle information includes the current battery cell temperature and the current power level. By obtaining the current vehicle information including at least the two, the charging current can be dynamically adjusted according to the current battery cell temperature and the current power level in subsequent control, thereby maximizing the charging efficiency and shortening the charging time while ensuring safety.

[0057] In step S102, the heater is first turned on and the status is detected. If the heater is on, it is assumed that the environment is low temperature and the cabin heating function needs to be turned on while charging. The standard charging current table and the safety current factor table are first obtained. The standard charging current table includes standard charging currents of multiple interval groups, and the safety current factor table includes safety current factors of multiple interval groups. The interval groups include battery cell temperature intervals and power intervals.

[0058] Based on the combination of different battery cell temperature ranges and different power ranges, the standard charging current and safety current coefficient in various situations are calculated, which is convenient for subsequent confirmation of the safe charging current based on the standard charging current and safety current coefficient. It can effectively prevent safety hazards caused by excessive current in low temperature environments, thereby improving safety during the charging process.

[0059] In step S103, a safe charging current is determined according to current vehicle information, a standard charging current table and a safety current factor table, and the battery is charged with the safe charging current.

[0060] Specifically, according to the current vehicle information, that is, the current battery cell temperature and the current power, the standard charging current and the safety current coefficient of the interval are determined in the standard charging current table and the safety current coefficient table, and the standard charging current is limited as the safe charging current according to the safety current coefficient. The battery is charged with the safe charging current. The standard charging current and the safety current coefficient can be adjusted in real time according to the current vehicle information, thereby adjusting the safe charging current, realizing intelligent battery management, and avoiding damage to the battery due to excessive current, effectively extending the battery life, and maximizing the charging efficiency and shortening the charging time.

[0061] In an embodiment of the present application, a method for charging an electric vehicle battery responds to a charging instruction, obtains current vehicle information including at least the current battery cell temperature and the current power, and detects the heater on state. If the heater is on, a standard charging current table and a safety current coefficient table including multiple interval groups are obtained, and a safe charging current is determined based on the current vehicle information, the standard charging current table and the safety current coefficient table, and finally the battery is charged with a safe charging current. Under the premise of ensuring battery safety, the battery can be charged at maximum power when APTC heating is turned on, and APTC heating at all gears can be met, avoiding the situation where customers charge slowly or even lose power during charging at extremely low temperatures, and no other devices need to be added, saving costs.

[0062] In one embodiment, the current vehicle information includes: current battery cell temperature, current power, and current heater duty cycle;

[0063] The standard charging current table includes standard charging currents of multiple interval groups, and the safety current factor table includes safety current factors of multiple interval groups, where the interval groups include battery cell temperature intervals and power intervals;

[0064] Determine the safe charging current based on the current vehicle information, the standard charging current table and the safety current factor table, including:

[0065] Determine the current standard charging current in the standard charging current table according to the current battery cell temperature and the current charge;

[0066] Determine the current safety current factor in the safety current factor table according to the current battery cell temperature and the current power;

[0067] The safe charging current is determined based on the current standard charging current, the current safety current factor and the current heating duty cycle.

[0068] In this embodiment, the current vehicle information also includes the current heating duty cycle, that is, the current vehicle information at least includes the current battery core temperature, the current power and the current heating duty cycle.

[0069] Specifically, the safe charging current is determined according to the current vehicle information, the standard charging current table and the safety current factor table. The current standard charging current is first determined in the standard charging current table according to the current battery cell temperature and the current charge. Then, the current safety current factor is determined in the safety current factor table according to the current battery cell temperature and the current charge. In other words, the intervals in the standard charging current table and the safety current factor table are determined according to the current battery cell temperature interval and the current charge interval. This can more accurately and dynamically adapt to different ambient temperatures and battery conditions, thereby improving the reliability of charging under various usage conditions.

[0070] After determining the current safety current coefficient, the safe charging current is determined based on the current standard charging current, the current safety current coefficient and the current heating duty cycle. By introducing the current heating duty cycle, that is, the size of the heating gear, the parameters in the battery charging process are further refined, making the determination of the safe charging current more accurate. While being able to meet the heating needs of the APTC heater at all gears, it can also charge at the maximum power within a safe range, avoiding the situation where customers charge slowly or even lose power during charging under extremely low temperatures.

[0071] In one embodiment, determining the safe charging current according to the current standard charging current, the current safety current factor and the current heating duty cycle specifically includes:

[0072] Determine the safe charging current according to the following formula:

[0073] I1=I0×(K1-n)X / K2(1)

[0074] Among them, I1 is the safe charging current, I0 is the current standard charging current, n is the current heating duty cycle, X is the current safety current coefficient, K1 is the first constant, and K2 is the second constant.

[0075] In this embodiment, the safe charging current can be determined according to formula (1) based on the current standard charging current, the current safety current coefficient and the current heating duty cycle, where n is the current heating duty cycle, the value range of n is from 0.1 to 0.9 (including 0.1 and 0.9), and n can increase / decrease in intervals of 0.1.

[0076] Among them, the design of K1 and K2 is determined according to the maximum heating duty cycle, the minimum heating duty cycle and the maximum safety current coefficient. K1 and K2 need to ensure:

[0077] (K1-nmax) / K2≤1;

[0078] (K1-nmin) / K2≥1, and (K1-nmin)Xmax / K2≤1;

[0079] Among them, nmax is the maximum heating duty cycle, nmin is the minimum heating duty cycle, and Xmax is the maximum safe current coefficient.

[0080] By limiting (K1-nmax) / K2≤1, when the heating duty cycle is maximum, I1≤I0×X, thus ensuring safety.

[0081] By limiting (K1-nmin) / K2≥1, when the heating duty cycle is the smallest, I1≥I0×X, so that when the heating duty cycle is small, the safe charging current can be increased, I1≥I0×X. At the same time, by limiting (K1-nmin)Xmax / K2≤1, I0×(K1-nmin)Xmax / K2≤I0, ensuring that the calculated safe charging current does not exceed the standard charging current.

[0082] In a preferred embodiment, K1 is 2.9, K2 is 2, and when the heating gear is turned to the maximum, n is 0.9. At this time, I1=I0×X, that is, when the heating gear is turned to the maximum, the current standard charging current multiplied by the current safety current coefficient is the safe charging current.

[0083] When the heating gear is at the minimum, n is 0.1, and I1=I0×1.4X. That is to say, when the heating gear is turned to the minimum, the current standard charging current multiplied by 1.4 times the current safety current coefficient is the safe charging current.

[0084] Different battery models have different K1 and K2 in formula (1), which are determined based on the characteristics of the battery.

[0085] In another embodiment, after detecting the heater on state, the method further includes:

[0086] If the heater is turned off, a standard charging current table is obtained, a safe charging current is determined according to current vehicle information and the standard charging current table, and the battery is charged with the safe charging current.

[0087] In this embodiment, the standard charging current table includes standard charging currents of multiple interval groups, the safety current factor table includes safety current factors of multiple interval groups, and the interval groups include battery cell temperature intervals and power intervals.

[0088] Specifically, if it is detected that the heater is turned off, it is assumed that the vehicle is not in a low temperature environment at this time, or that there is no one in the vehicle compartment in a low temperature environment and heating is not required. At this time, there is no need to consider the impact of using the heater on the battery. It is only necessary to obtain the standard charging current table and determine the standard charging current in the standard charging current table as the safe charging current based on the previously obtained current vehicle information, where the current vehicle information at least includes the current battery cell temperature and the current power, and charge the battery with the safe charging current. This method can adapt to different heater on states and use corresponding charging strategies, which enhances the adaptability and flexibility of this method in various environments.

[0089] like Figure 2 As shown, a working flow chart of a method for charging an electric vehicle battery in another embodiment of the present invention includes:

[0090] Step S201: In response to a charging instruction, obtaining current vehicle information, the current vehicle information including: current battery cell temperature, current power and current heating duty cycle;

[0091] Step S202A: Detect the heater on state. If the heater on state is on, obtain a standard charging current table and a safety current factor table. The standard charging current table includes standard charging currents of multiple interval groups. The safety current factor table includes safety current factors of multiple interval groups. The interval groups include battery cell temperature intervals and power intervals. Then proceed to step S203A.

[0092] Step S202B: Otherwise, obtain a standard charging current table and proceed to step S203B;

[0093] Step S203A: determining the current standard charging current in the standard charging current table according to the current battery cell temperature and the current power, and proceeding to step S204;

[0094] Step S203B: Determine the safe charging current according to the current vehicle information and the standard charging current table, and proceed to step S206;

[0095] Step S204: determining a current safety current coefficient in the safety current coefficient table according to the current battery core temperature and the current power;

[0096] Step S205: determining a safe charging current according to the current standard charging current, the current safety current coefficient and the current heating duty cycle;

[0097] Step S206: charging the battery using the safe charging current.

[0098] like Figure 3 As shown, a workflow diagram of a method for determining a safety current coefficient in an embodiment of the present application includes:

[0099] Step S301: taking the maximum current generated by the heater as the maximum current of the heater;

[0100] Step S302: performing a test operation on each of the interval groups in the standard charging current table to obtain the safety current coefficients of the multiple interval groups, the standard charging current table including the standard charging current of the multiple interval groups, the interval groups including the battery cell temperature interval and the power interval;

[0101] Step S303: combining the safety current coefficients of the plurality of interval groups into the safety current coefficient table.

[0102] Specifically, in step S301, the cabin heating gear of the heater is turned to the maximum, and the maximum current generated is the maximum current of the heater. If the maximum current of the heater is superimposed on the battery at this time, it can simulate the maximum recharge current generated on the battery when the maximum heater gear is turned on. Superimposing it with the charging current can restore the situation where the heater is turned on when the battery is charging.

[0103] In step S302, a test operation is performed on each interval group in the standard charging current table to obtain a safety current coefficient for multiple interval groups, wherein the interval groups include a battery cell temperature interval and a power interval, which can adapt to different battery cell temperatures and power conditions and provide a safety current coefficient suitable for various environments and states.

[0104] In step S303, the safety current coefficients of multiple interval groups are combined into a safety current coefficient table. It can be said that the safety current coefficient table is composed of the order of the interval groups, that is, the size of the battery cell temperature and the size of the power. If the safe charging current needs to be limited later, when the current battery cell temperature and the current power are obtained, the corresponding data can be searched in the standard charging current table and the safety current coefficient table, and calculations can be performed to obtain the safe charging current.

[0105] In one embodiment, the testing operation includes:

[0106] Select a current coefficient to be measured, and multiply the standard charging current of the interval group by the current coefficient to be measured to obtain the charging current to be measured;

[0107] The battery to be tested is charged by using the charging current to be tested and superimposing the maximum current of the heater;

[0108] Determine whether there is a safety risk based on the charging test results. If there is a safety risk, select another current coefficient to be tested and perform the test operation again. Otherwise, use the current coefficient to be tested when there is no safety risk as the safety current coefficient of the interval group and end the test operation.

[0109] In this embodiment, a current coefficient to be measured is firstly prepared, and the standard charging current in the interval group is multiplied by the current coefficient to be measured to obtain the charging current to be measured, wherein the current coefficient to be measured is less than 1 and greater than 0, and is used to limit the charging current.

[0110] The battery to be tested is charged with the charging current to be tested and the maximum current of the heater is superimposed to perform a charging test. This can simulate the situation where an electric vehicle is charged in a low temperature environment while the heater is turned on. The maximum current of the heater is used to obtain the recharge current of the battery at the maximum heater gear. The recharge current is superimposed with the charging current to be tested to test the impact of the recharge current on the battery when the battery is charged with the charging current to be tested, and whether the current coefficient to be tested can ensure the safety of the battery, thereby maximizing the charging efficiency and shortening the charging time.

[0111] Whether there is a safety risk is determined based on the charging test results. If there is a safety risk, another current coefficient to be tested is selected and the test operation is performed again. This dynamic adjustment mechanism can effectively avoid excessive current values ​​and ensure the accuracy and safety of the test results.

[0112] Specifically, when making the initial selection of the current coefficient to be tested, a larger current coefficient to be tested should be selected for testing as much as possible. If the charging test result of the current coefficient to be tested poses a safety risk, a smaller current coefficient to be tested should be selected for testing. If no safety risk arises subsequently, the current coefficient to be tested can be used as the safety current coefficient of the interval group and the test operation of the interval group can be terminated.

[0113] By performing a test operation on each interval group, the safe current factor of each interval group can be accurately determined, so that the battery can remain safe and reliable in all usage scenarios as much as possible.

[0114] In a preferred embodiment, the charging test uses a three-electrode test method, firstly the reference electrode is plated with lithium and then tested, and lithium is extracted based on the charging curve to determine whether there is a safety risk.

[0115] In another embodiment, the testing operation includes:

[0116] Select a current coefficient to be measured, and multiply the standard charging current of the interval group by the current coefficient to be measured to obtain the charging current to be measured;

[0117] The battery to be tested is charged and discharged by superimposing the charging current to be tested and the maximum current of the heater;

[0118] After a preset number of charge and discharge cycles, the battery cells to be tested are disassembled, and it is determined whether there is a safety risk based on the condition of the battery cells. If there is a safety risk, another current coefficient to be tested is selected and the test operation is performed again. Otherwise, the current coefficient to be tested when there is no safety risk is used as the safety current coefficient of the interval group and the test operation is terminated.

[0119] In this embodiment, the process of formulating the current coefficient to be measured and obtaining the charging current to be measured is consistent with the above, and will not be repeated. The difference is that the charging current to be measured is superimposed on the maximum current of the heater for the battery to be measured, and then the charge and discharge cycle is performed.

[0120] Specifically, after the battery to be tested has been charged and discharged for a preset number of cycles, the battery cells to be tested are disassembled and a determination is made as to whether there is a safety risk based on the condition of the battery cells. The main thing is to observe whether lithium deposition occurs in the battery cells. If not, it can be determined that the current coefficient to be tested within the interval group has passed the test and can be used as a safe current coefficient.

[0121] When making the initial selection of the current coefficient to be tested, a larger current coefficient to be tested should be selected for testing as much as possible. If the charge and discharge cycle results of the current coefficient to be tested pose a safety risk, a smaller current coefficient to be tested should be selected for testing. If no safety risk arises subsequently, the current coefficient to be tested can be used as the safety current coefficient of the interval group and the test operation of the interval group can be terminated.

[0122] In a preferred embodiment, the preset number of cycles is at least 50, which can fully verify the battery performance and ensure the reliability of the obtained safety current coefficient in long-term use. The cumulative effect of the battery during repeated charging and discharging can be observed, and possible potential problems or safety hazards can be discovered in time. At least 50 charge and discharge cycles are performed in different interval groups, which can cover the performance of the battery in various states, ensure the comprehensiveness and reliability of the test, reduce the impact of accidental factors on the test results, and provide a more stable safety current coefficient.

[0123] like Figure 4 As shown, a workflow diagram of a method for determining a safety current coefficient in an embodiment of the present application includes:

[0124] Step S401: taking the maximum current generated by the heater as the maximum current of the heater;

[0125] Step S402: selecting a current coefficient to be measured, and multiplying the standard charging current of the interval group by the current coefficient to be measured to obtain the charging current to be measured;

[0126] Step S403: performing a charging test on the battery to be tested by superimposing the charging current to be tested and the maximum current of the heater;

[0127] Step S404: judging whether there is a safety risk according to the charging test result; if there is a safety risk, selecting another current coefficient to be tested and performing the test operation again;

[0128] Step S405: if there is no safety risk, the current coefficient to be measured is used as the safety current coefficient of the interval group and the test operation is terminated;

[0129] Step S406: combining the safety current coefficients of the plurality of interval groups into the safety current coefficient table.

[0130] like Figure 5 As shown, a working flow chart of a method for determining a safety current coefficient in another embodiment of the present application includes:

[0131] Step S501: taking the maximum current generated by the heater as the maximum current of the heater;

[0132] Step S502: selecting a current coefficient to be measured, and multiplying the standard charging current of the interval group by the current coefficient to be measured to obtain the charging current to be measured;

[0133] Step S503: performing a charge-discharge cycle on the battery to be tested by using the charging current to be tested and superimposing the maximum current of the heater;

[0134] Step S504: after a preset number of charge and discharge cycles, dismantle the cells of the battery to be tested, and determine whether there is a safety risk based on the cell conditions;

[0135] Step S505: If there is a safety risk, select another current coefficient to be tested and perform the test operation again.

[0136] Step S506: if there is no safety risk, the current coefficient to be measured is used as the safety current coefficient of the interval group and the test operation is terminated;

[0137] Step S507: combining the safety current coefficients of the plurality of interval groups into the safety current coefficient table.

[0138] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0139] The technical solution of the present application also provides a storage medium, which stores computer instructions. When a computer executes the computer instructions, it is used to execute an electric vehicle battery charging method in any of the aforementioned embodiments.

[0140] Figure 6 An electronic device of the present application is shown, comprising:

[0141] at least one processor 601; and,

[0142] A memory 602 is communicatively connected to the at least one processor 601; wherein,

[0143] The memory 602 stores instructions executable by the at least one processor 601 , and the instructions are executed by the at least one processor 601 so that the at least one processor 601 can execute all steps of an electric vehicle battery charging method in any of the aforementioned method embodiments.

[0144] Figure 6 Take a processor 601 as an example:

[0145] The electronic device may further include: an input device 603 and an output device 604 .

[0146] The processor 601, the memory 602, the input device 603 and the output device 604 may be connected via a bus or other means, and the figure takes the connection via a bus as an example.

[0147] The memory 602 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to an electric vehicle battery charging method in an embodiment of the present application, for example, Figure 1-5 The processor 601 executes various functional applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 602, that is, implementing an electric vehicle battery charging method in the above embodiment.

[0148] The memory 602 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and applications required for at least one function; the data storage area may store data created according to the use of a method for charging an electric vehicle battery, etc. In addition, the memory 602 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 602 may optionally include a memory remotely arranged relative to the processor 601, and these remote memories may be connected to a device for executing a method for charging an electric vehicle battery via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0149] The input device 603 can receive input user clicks and generate signal inputs related to user settings and function control of the electric vehicle battery charging method. The output device 604 can include display devices such as display screens.

[0150] The one or more modules are stored in the memory 602 , and when executed by the one or more processors 601 , an electric vehicle battery charging method in any of the above method embodiments is executed.

[0151] The technical solution of the present application also provides a vehicle, which includes a vehicle body and the electronic device as described above installed on the vehicle body.

[0152] The above description is only the principle and preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this field, the implementation methods obtained by appropriately combining the technical solutions disclosed in different embodiments are also included in the technical scope of the present invention. On the basis of the principle of the present application, several other variations can be made, which should also be regarded as the protection scope of the present application.

Claims

1. A method for charging an electric vehicle battery, characterized in that: include: In response to the charging instruction, obtaining current vehicle information; Detecting the heater on state, and if the heater on state is on, obtaining a standard charging current table and a safety current factor table; A safe charging current is determined according to the current vehicle information, the standard charging current table and the safety current factor table, and the battery is charged using the safe charging current.

2. The method for charging an electric vehicle battery according to claim 1, characterized in that: The current vehicle information includes: current battery core temperature, current power and current heating duty cycle; The standard charging current table includes standard charging currents of multiple interval groups, the safety current coefficient table includes safety current coefficients of multiple interval groups, and the interval groups include battery cell temperature intervals and power intervals; The determining of the safe charging current according to the current vehicle information, the standard charging current table and the safety current coefficient table specifically includes: Determine the current standard charging current in the standard charging current table according to the current battery core temperature and the current power; Determine a current safety current coefficient in the safety current coefficient table according to the current battery core temperature and the current power; A safe charging current is determined according to the current standard charging current, the current safety current factor and the current heating duty cycle.

3. The method for charging an electric vehicle battery according to claim 2, characterized in that: The determining of the safe charging current according to the current standard charging current, the current safety current coefficient and the current heating duty cycle specifically includes: Determine the safe charging current according to the following formula: =I0×(K1-n)X / K2 Among them, I1 is the safe charging current, I0 is the current standard charging current, n is the current heating duty cycle, X is the current safety current coefficient, K1 is the first constant, and K2 is the second constant.

4. The electric vehicle battery charging method according to claim 1, characterized in that: After the heater is turned on, the method further includes: If the heater is turned off, a standard charging current table is obtained, a safe charging current is determined according to the current vehicle information and the standard charging current table, and the battery is charged with the safe charging current.

5. A method for determining a safety current coefficient, characterized in that: include: The maximum current generated by the heater is taken as the maximum heater current; Performing a test operation on each of the interval groups in the standard charging current table to obtain the safety current coefficients of the multiple interval groups, the standard charging current table including the standard charging current of the multiple interval groups, the interval groups including the battery cell temperature interval and the power interval; The safety current factors of a plurality of the interval groups are combined into the safety current factor table.

6. A method for determining a safety current coefficient according to claim 5, characterized in that: The test operation includes: Select a current coefficient to be measured, and obtain the charging current to be measured by multiplying the standard charging current of the interval group by the current coefficient to be measured; Performing a charging test on the battery to be tested by superimposing the charging current to be tested and the maximum current of the heater; Determine whether there is a safety risk based on the charging test result. If there is a safety risk, select another current coefficient to be tested and perform the test operation again. Otherwise, use the current coefficient to be tested when there is no safety risk as the safety current coefficient of the interval group and end the test operation.

7. A method for determining a safety current coefficient according to claim 5, characterized in that: The test operation includes: Select a current coefficient to be measured, and obtain the charging current to be measured by multiplying the standard charging current of the interval group by the current coefficient to be measured; The battery to be tested is charged and discharged by using the charging current to be tested and superimposed with the maximum current of the heater; After a preset number of charge and discharge cycles, the battery cells of the battery to be tested are disassembled, and it is determined whether there is a safety risk based on the battery cell condition. If there is a safety risk, another current coefficient to be tested is selected and the test operation is performed again. Otherwise, the current coefficient to be tested when there is no safety risk is used as the safe current coefficient of the interval group and the test operation is terminated.

8. A storage medium, characterized in that: The storage medium stores computer instructions, and when a computer executes the computer instructions, it is used to execute an electric vehicle battery charging method as described in any one of claims 1-4.

9. An electronic device, characterized in that: comprising at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the electric vehicle battery charging method as described in any one of claims 1-4.

10. A vehicle, characterized in that: The vehicle includes a vehicle body and the electronic device according to claim 9 mounted on the vehicle body.

Images