A charger and a charging method

Abstract

The present invention relates to a charger and a charging method, which belongs to the technical field of chargers and solves the problem of poor charging safety in the prior art. The charging method of the present invention comprises: S0, starting a standby program, setting an initial charging voltage, and starting to record the charging time; S1, estimating the battery capacity Cg according to the number of initial rechargeable batteries and the initial charging voltage, determining a safe current according to the estimated battery capacity Cg, and setting a charging current for fast charging according to the safe current; S2, determining a normal charging voltage for fast charging according to the current number of rechargeable batteries and the number of low-power batteries, and starting fast charging; S3, after updating the number of rechargeable batteries and the number of low-power batteries, returning to step S2 until the voltage of the battery pack reaches the normal charging voltage for fast charging or the charging time for fast charging reaches a preset time. The charging method of the present invention can improve charging safety and charging speed.

Description

Technical Field

[0001] The present invention relates to the technical field of chargers, and in particular to a charger and a charging method. Background Art

[0002] In order to ensure charging safety, the charging parameters of the charger need to be adapted to the battery (group) to be charged. If a small battery is connected to a powerful battery charger, problems will arise, such as overheating of the battery due to the large charging current, which will affect the battery life, and in severe cases, explosion may occur, posing a major safety hazard. However, in general, before charging, the user cannot accurately obtain the actual parameters of the battery to be charged. For example, if the battery is discharged after a long period of non-use, it will be low in power. In this way, when charging with an existing charger, the safety of the charging process cannot be guaranteed. Summary of the invention

[0003] In view of the above analysis, the embodiments of the present invention aim to provide a charger and a charging method to solve the problem of poor charging safety in the prior art.

[0004] In one aspect, an embodiment of the present invention provides a charging method of a charger, the method comprising:

[0005] S0, start the standby program, set the initial charging voltage, and start recording the charging time;

[0006] S1, estimating a battery capacity Cg according to the number of initial rechargeable batteries and an initial charging voltage, determining a safety current according to the estimated battery capacity Cg, and setting an initial charging current for fast charging according to the safety current;

[0007] S2, determining the charging voltage for fast charging according to the number of current rechargeable batteries and the number of low-power batteries, and starting fast charging;

[0008] S3, after updating the number of rechargeable batteries and the number of low-power batteries, return to step S2 until the voltage of the battery pack reaches the normal charging voltage for fast charging or the charging time for fast charging reaches a preset time.

[0009] Based on the improvement of the above method, in step S1, the safety current is determined according to the estimated battery capacity, and the charging current of the fast charge is set according to the safety current, including the following steps:

[0010] Obtain the safety current corresponding to the estimated battery capacity by using a table lookup method;

[0011] The smaller value between the safety current and the maximum output current of the charger is selected as the charging current for fast charging.

[0012] Based on the improvement of the above method, step S2 includes the following steps:

[0013] S20, determining a normal charging voltage for fast charging according to the initial charging voltage and the number of current rechargeable batteries;

[0014] S21, determining whether the battery pack meets the repair charging condition, if yes, executing step S22, if no, executing step S24, wherein the repair charging condition includes: the number of the current low-power batteries is greater than the number of rechargeable batteries, or the estimated battery capacity is less than the capacity threshold;

[0015] S22, performing a repair charging for a preset repair time on the battery pack using a repair charging voltage that is lower than the normal charging voltage, and recording the accumulated repair charging time;

[0016] S23, determining whether the accumulated repair charging time is less than the repair charging time threshold, if so, executing step S21, if not, executing step S1;

[0017] S24, quickly charging the battery pack according to the normal charging voltage.

[0018] Based on the improvement of the above method, after step S3, the method further includes:

[0019] S4, turn off the current output of the charger, turn on the dummy load and adjust the voltage of the dummy load to the rated voltage, measure the open circuit voltage at this time after standing for a preset time, re-estimate the battery capacity Cr according to the open circuit voltage, and then determine whether the jump condition is met.

[0020] If yes, then execute step S5 or step S6; if no, then determine the safe current according to the re-estimated battery capacity Cr, and adjust the charging current of the fast charge according to the accumulated charging time, and then execute step S2;

[0021] S5, is the charging current limit and The charging time is limited to limit the current and time.

[0022] S6, with is the charging voltage limit and The charging current limit is set, and voltage and current limiting charging is performed, and the national standard high voltage timing is started.

[0023] Based on the improvement of the above method, the jump condition includes:

[0024] 1) The number of depleted batteries is greater than the number of rechargeable batteries, and the duration is greater than the jump time threshold;

[0025] 2) The number of times that the actual charging current during repair charging is less than the maximum charging current during repair charging is less than the preset number of times;

[0026] 3) The accumulated charging time is greater than the total charging time threshold;

[0027] If any of the above jump conditions is met, step S5 or S6 is executed.

[0028] Based on the improvement of the above method, the method further includes:

[0029] S7, with is the charging voltage limit and The charging current is limited to the voltage and current limit. , ;

[0030] In step S6, when the charging current decreases to , execute step S7.

[0031] Based on the improvement of the above method, the method further includes:

[0032] S8, constant current and voltage limited charging, the charging current is equal to , , the charging voltage is less than or equal to the highest control voltage of a single battery;

[0033] Among them, in step S6, when the national standard high-voltage timer exceeds the high-voltage time threshold, step S8 is executed;

[0034] In step S7, when the charging current is reduced to the lamp turning current, or the national standard high voltage timer reaches the lamp turning time or high voltage time threshold, step S8 is executed.

[0035] Based on the improvement of the above method, step S8, constant current and voltage limited charging is performed, including: setting the charging time according to the temperature of the charger.

[0036] Based on the improvement of the above method, the method further includes:

[0037] S0a, performs high temperature protection operation according to the temperature of the charger.

[0038] Based on the improvement of the above method, in step S0, if the number of times that the battery voltage is monitored to be greater than the minimum starting voltage exceeds a preset number, the charger starts the standby program.

[0039] On the other hand, an embodiment of the present invention provides a charger that uses the charging method as described above to perform charging control.

[0040] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0041] 1. In the present invention, after the charger is started, the number of low-power batteries and rechargeable batteries is calculated and updated in a rolling manner. The charger enters the standby program, and after the initial charging voltage is set, the battery capacity is estimated, and then the safe current and the fast-charging charging current are determined, thereby achieving a reasonable setting of the charging current and improving charging safety.

[0042] 2. In the present invention, the state of the battery pack is quickly identified based on the number of rechargeable batteries, the number of low-power batteries and the estimated battery capacity, and the charging voltage is automatically adjusted according to the state of the battery pack, which is beneficial to improving the charging speed and ensuring the safety and service life of the battery.

[0043] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components;

[0045] Figure 1 is a flow chart of a charging method according to an embodiment of the present invention;

[0046] Figure 2 The charging current curve and output power curve of the charger of model 1 in the embodiment of the present invention during the charging process;

[0047] Figure 3 The charging current curve and the output power curve of the charger of model 2 in the embodiment of the present invention during the charging process. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0049] The embodiment of the present invention provides a charging method of a charger, such as Figure 1 The method comprises:

[0050] S0, start the standby program, set the initial charging voltage, and start recording the charging time;

[0051] S1, estimating the battery capacity Cg according to the number of current rechargeable batteries and the initial charging voltage, determining the safety current according to the estimated battery capacity Cg, and setting the charging current for fast charging according to the safety current;

[0052] S2, determining a charging voltage for fast charging according to the number of rechargeable batteries and the number of low-power batteries, and starting fast charging;

[0053] S3, after updating the number of rechargeable batteries and the number of low-power batteries, return to step S2 until the voltage of the battery pack reaches the normal charging voltage for fast charging or the charging time for fast charging reaches a preset time.

[0054] After the charger is started, the number of rechargeable batteries and the number of low-power batteries in the battery pack are calculated and updated at preset time intervals.

[0055] During implementation, when the voltage of a single battery is less than 11.5V, the battery is a low-power battery; when the voltage of a single battery is greater than or equal to 11.5V, the battery is a rechargeable battery.

[0056] Compared with the prior art, in the present invention, after the charger is started, the number of low-power batteries and rechargeable batteries is calculated and updated in a rolling manner. The charger enters the standby program, and after the initial charging voltage is set, the battery capacity is estimated, and then the safe current and the fast-charging charging current are determined, thereby achieving a reasonable setting of the charging current and improving charging safety.

[0057] In the present invention, the state of the battery pack is quickly identified according to the number of rechargeable batteries, the initial number of low-power batteries and the estimated battery capacity, and the charging voltage is automatically adjusted according to the state of the battery pack, which can increase the charging speed and ensure the safety and service life of the battery.

[0058] It should be noted that the safe current in the embodiment of the present invention is the maximum current allowed during the charging process.

[0059] In addition, after the charger is started, it begins to monitor and calculate parameters such as temperature, charging voltage, lamp turning current, lamp turning time, temperature compensation voltage DeltaV, unit conductance, etc., and updates them at preset time intervals (for example, 30 minutes).

[0060] In step S0 , if the number of times that the battery voltage is detected to be greater than the minimum starting voltage exceeds a preset number, for example, 10 times, the charger starts a standby procedure.

[0061] In one embodiment, after starting the standby program, the following operations and parameter setting steps are performed:

[0062] Turn off the current output and the fan;

[0063] Green light flashes (1s on + 1s off);

[0064] When the battery voltage measurement circuit voltage is detected to be greater than the minimum starting voltage for 10 consecutive times:

[0065] 1) The total charging time starts counting (T1_total++);

[0066] 2) When the time is greater than 4s, measure the initial open circuit voltage U0a;

[0067] 3) Set U0=U0a, where U0 will be continuously updated and calculated during the subsequent charging process;

[0068] 4) The charging capacity accumulation identifier (Mark_capacity) is assigned a value of 0;

[0069] 5) Set other initial variable values.

[0070] In step S1, the battery capacity Cg is estimated based on the number of rechargeable batteries and the initial charging voltage.

[0071] Specifically, in step S1, the battery capacity Cg is estimated by the conductivity method, including the following steps:

[0072] Charge the battery pack with charging current A1 for t1 seconds, and record the voltage U11 after charging for t1 seconds;

[0073] Cut off the power for t2 seconds, and record the voltage U21 at t21 seconds, t21<t2;

[0074] Charge the battery pack with charging current A2 for t3 seconds, and record the voltage U12 t3 seconds after charging;

[0075] Power off for t4 seconds, and record the voltage U22 after t41 seconds of power off, and the voltage after t4 seconds of power off, t41<t4<t2;

[0076] After obtaining the above data, calculate the battery capacity according to the following formula:

[0077] R1=(U11-U21) / A1;

[0078] R2=(U12-U22) / A2;

[0079] R = (R1 + R2) / 2;

[0080] r = R / N2;

[0081] G = 1 / r;

[0082] Cg=G / g.

[0083] Step S1 is used to obtain status data such as the number of low-power batteries and capacity of the battery pack to be charged before starting charging, and then reasonably set various charging parameters according to the obtained battery status data, including safety current and fast charging current, so as to ensure safety during the charging process and improve the charging effect.

[0084] In step S1, a safe current is determined according to the estimated battery capacity, and a charging current for fast charging is set according to the safe current, including the following steps:

[0085] By looking up Table 1, obtain the safety current (maximum current) I_batt_limit corresponding to the estimated battery capacity;

[0086] A smaller value between the safety current I_batt_limit and the maximum output current I_charger_limit of the charger is selected as the charging current I_real for fast charging.

[0087] That is, I_real=Min(I_batt_limit, I_charger_limit), and I_real>2A.

[0088] Table 1

[0089]

[0090] Step S2 includes the following steps:

[0091] S20, determining a normal charging voltage during fast charging according to the initial charging voltage and the number of current rechargeable batteries;

[0092] S21, determining whether the battery pack meets the repair charging condition, if yes, executing step S22, if no, executing step S24, wherein the repair charging condition includes: the number N_1 of the current low-power batteries is greater than the number N_2 of the rechargeable batteries, or the estimated battery capacity is less than the capacity threshold (which can be set to 8AH);

[0093] S22, using a repair charging voltage lower than a normal charging voltage to perform a repair charging of the battery pack for a preset repair time, and recording the cumulative repair charging time; during the repair charging process, the red light flashes (1s on + 1s off);

[0094] S23, determining whether the accumulated repair charging time is less than a repair charging time threshold (e.g., 3 hours), if so, executing step S21, if not, executing step S1;

[0095] S24, charging the battery pack normally according to the normal charging voltage until the battery voltage reaches the normal charging voltage Or the charging time T_step reaches the preset time (e.g. 30 minutes). During normal charging, the red light is on and the green light is off.

[0096] Steps S2 and S3 are the steps of fast charging. In this embodiment, when charging starts, fast charging is performed first. The normal charging voltage U of fast charging is set according to the temperature compensation voltage and the number of rechargeable batteries. At the same time, during fast charging, it is necessary to first determine whether the battery pack needs repair charging. If so, repair charging is performed first. After the repair charging is completed, normal fast charging (normal charging) is performed at the normal charging voltage.

[0097] Compared with the prior art, the fast charging of the embodiment of the present invention includes two modes: normal charging and repair charging. Specifically, the normal charging voltage of the fast charging is set according to the number of rechargeable batteries. When entering the fast charging, it is first determined whether the repair charging conditions are met. If so, the battery pack is first repair charged according to the repair charging voltage. After the repair is completed, the battery pack is normally charged according to the normal charging voltage.

[0098] Specifically, in step S22, the repair charging voltage U is set according to the number of rechargeable batteries N_2 and the temperature compensation voltage DeltaV, and the low-power battery is repaired and charged with the repair charging voltage U. For example, in order to prevent misjudgment caused by inserting a rechargeable battery, when N_2==4, When N_2==5, When N_2==6, .

[0099] During repair charging, the maximum charging time for each unit is set to 5 minutes.

[0100] When fast charging is finished, the actual charging time T_step_real of this step is recorded, and the maximum charging time T_step_max is calculated; the actual charging current I_step_real of this step is recorded, and the maximum charging current I_step_max is calculated.

[0101] After step S3, the method further comprises:

[0102] S4, turn off the current output of the charger, turn on the dummy load and adjust the voltage of the dummy load to the rated voltage, measure the open circuit voltage at this time after standing for a preset time, re-estimate the battery capacity Cr according to the open circuit voltage, and then determine whether the jump condition is met.

[0103] If yes, then execute step S5 or step S6; if no, then determine the safe current based on the re-estimated battery capacity, adjust the charging current based on the accumulated charging time, and then execute step S2;

[0104] S5, is the charging current limit and The charging time is limited to limit the current and time.

[0105] S6, with is the charging voltage limit and The charging current limit is set, and voltage and current limiting charging is performed, and the national standard high voltage timing is started.

[0106] In the embodiment of the present invention, after fast charging, the battery capacity is re-estimated to set parameters such as charging current and charging time during subsequent charging.

[0107] In one embodiment, in step S4, re-estimating the battery capacity Cr according to the open circuit voltage measured in step S3 includes the following steps:

[0108] 1) Voltage calculation:

[0109] U1=U0a / N_2; when it is calculated that U1<11V, set U1=11.

[0110] U2=U0 / N_2;

[0111] U3=U2-U1.

[0112] 2).△SOC calculation:

[0113] .

[0114] 3). Battery capacity estimation (integral method):

[0115] Cr=Cc / △SOC.

[0116] Specifically, in step S4, the jump condition includes:

[0117] 1) The number of depleted batteries N_1 is greater than the number of rechargeable batteries N_2, and the duration is greater than the jump time threshold (2h);

[0118] 2) The actual charging current during repair charging is less than the maximum charging current during repair charging for a preset number of times (5 consecutive times);

[0119] 3) The accumulated charging time is greater than the total charging time threshold (10h);

[0120] If any of the above jump conditions is met, step S5 or S6 is executed.

[0121] In step 4, if the jump condition is not met, the loop condition is met, and the process jumps to step 2 for fast charging. At the same time, the safe current is determined based on the re-estimated battery capacity Cr, and the fast charging current I_real is adjusted based on the accumulated charging time T_step_real.

[0122] Specifically, according to Cr, Table 1 is consulted to obtain the safety current I_batt_limit, and then the maximum charging current I_limit=Min(I_batt_limit, I_charger_limit) is determined, wherein the charging current I_real<=I_limit and I_real>0.1Cr.

[0123] Adjust the charging current as follows:

[0124] a) When T_step_real<5min, I_real=I_real-0.02Cr;

[0125] b) When T_step_real>=5min, I_real=I_real+0.02Cr.

[0126] In this embodiment, step S5 and step S6 are respectively steps for adjusting charging in two modes.

[0127] Step S5, adjusting charging mode 1:

[0128] 1) To limit current , charging time limited to 60 minutes.

[0129] 2) When the charging voltage is higher than When charging, the battery is charged with a charging current of I_real=I_real-0.01Cr.

[0130] 3). Until I_real<=0.1Cr.

[0131] Step S6, adjusting charging mode 2:

[0132] 1) To limit the pressure , current limiting , charge and start the national standard high voltage timing (T_GB_limit).

[0133] 2) When the charging current I_real <= 0.1C, jump to step S7.

[0134] 3) When T_GB_limit>178min, jump to step S8.

[0135] In one embodiment, after step S6, the method further includes: step S7 and step S8.

[0136] In step S6, when the charging current decreases to When the national standard high-voltage timer exceeds the high-voltage time threshold, step S8 is executed.

[0137] S7, with is the charging voltage limit and The charging current is limited to the voltage and current limit. , ; When the charging current is reduced to the turning light current, or the national standard high voltage timer reaches the turning light time or high voltage time threshold, execute step S8.

[0138] Step S8, constant current and voltage limiting charging is performed, and the charging current is equal to , , the charging voltage is less than or equal to the highest control voltage of a single battery.

[0139] Step S7 is a precise charging step, and the specific method is as follows:

[0140] 1) To limit the pressure , current limiting , to charge.

[0141] 2) When the current drops to the light-on current or the time reaches the light-on time, jump to step S8.

[0142] 3) When T_GB_limit>178min, jump to step S8.

[0143] Step S8 is the constant current and voltage limiting charging step (PROC and SOC charging). During charging, the red light is off and the green light is on. The specific method is: charging with a constant current of 0.015Cr and a voltage limiting of 16V / battery (the maximum output of the charger PWM is 16.4V / battery, and after deducting the voltage drop of the thyristor, the maximum control voltage of the battery is 16V / battery).

[0144] In addition, each time step S8 is executed, the charge count value is increased by 1.

[0145] In step S8, the charging time is set according to the temperature of the charger and the charging count value. Further, the temperature of the charger is obtained by detecting the ambient temperature.

[0146] Specifically, in step S8, the charging time is set according to the following rules:

[0147] a) When the charge count value is 0-5, the charging time is 120 minutes.

[0148] b) When the ambient temperature is greater than 35 degrees and the unit digit of the charge count value is 3 or 6, the charging time is 60 minutes.

[0149] c) When the ambient temperature is greater than 15 and less than or equal to 35 degrees, when the count value is 3 or 9, the charging time is 90 minutes; when the charge count value is 6, the charging time is 120 minutes.

[0150] d) When the ambient temperature is greater than 0 degrees and less than or equal to 15 degrees, when the count value is 1, 3, 7, or 9, the charging time is 90 minutes; when the count value is 5, the charging time is 120 minutes.

[0151] e) When the ambient temperature is less than or equal to 0 degrees, the charging time is 120 minutes.

[0152] f). Other conditions are as follows:

[0153] Table 2

[0154]

[0155] g) Special charging:

[0156] i) When the initial open circuit voltage is less than 9V / cell, the charging time is 120 minutes.

[0157] ii) When the initial open circuit voltage is greater than 13V / cell, the charging time is 120 minutes.

[0158] h) Charging is completed in this step, the charging count value increases by 1 and is written into the EEPROM.

[0159] In step S8, when plug-in charging is identified, the charging current is 0.05C, the charging time is 5H, and the red light flashes.

[0160] In addition, the charger charging method of the embodiment of the present invention further includes: a power-off and charging completion step S9, and a high temperature protection step S0a. The specific scheme is as follows:

[0161] Step S9, executing power-off and charging completion operations, including:

[0162] 1) Turn off the output.

[0163] 2) Turn off the fan.

[0164] 3) PWM voltage is set to U0-5V.

[0165] 4) When it is identified that the battery voltage is lower than the starting voltage, jump to step S0.

[0166] During charging, high temperature protection operations are performed, including:

[0167] 1) When the temperature is higher than 80 degrees and lower than 85 degrees, charge at 0.2A.

[0168] 2) When the temperature is higher than 85 degrees, charge at 0.2A. If the duration is longer than 15 minutes, jump to step S9.

[0169] 3) When the temperature is less than 80 degrees, jump to the original interruption point to continue charging.

[0170] An embodiment of the present invention provides a charger, which uses the charging method as described above to perform charging control.

[0171] The charger includes a chip for storing and executing a computer program for implementing the steps of the charging method of the charger of the embodiment of the present invention. Specifically, the chip can be configured as follows:

[0172] 1) Code capacity: above;

[0173] 2) EEPROM capacity: >256 bytes;

[0174] 3) With Bluetooth communication function (optional);

[0175] 4) Pins: 14 pins or 20 pins.

[0176] The charger includes a temperature measuring element, a heat dissipation element, a battery voltage measuring element, a charging voltage measuring element, etc. Among them, the temperature measuring element includes a thermistor.

[0177] The charger includes a (10W) power resistor as a dummy load, which can keep the charger with a power consumption of more than 10W when the battery charging current is turned off (switching to the 10W resistor consumes power).

[0178] Specifically, the charger according to the embodiment of the present invention can be provided with different models and specifications.

[0179] Model 1: 288W, suitable for 48V, 60V battery pack. Maximum current 5A, can charge 12AH, 20AH, 32AH. Capacity and battery pack voltage are automatically calculated and determined. Charging voltage range: 25V-80V (PWM to 82V). Charging current curve during charging, such as Figure 2 as shown in .

[0180] Model 2: 560W, suitable for 60V, 72V battery packs. Maximum current 7.8A, 20AH, 32AH, 45AH, 58AH. Automatic calculation of capacity and battery pack voltage. Compatible with 48V battery packs, but power utilization is reduced (device safety limit). Charging voltage range: 30V-96V (PWM to 98V). Charging current curve during charging, such as Figure 3 as shown in .

[0181] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0182] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A charging method for a charger, characterized in that: The method comprises: S0, start the standby program, set the initial charging voltage, and start recording the charging time; S1, estimating a battery capacity Cg according to the number of initial rechargeable batteries and an initial charging voltage, determining a safety current according to the estimated battery capacity Cg, and setting a charging current for fast charging according to the safety current; S2, determining the charging voltage for fast charging according to the number of current rechargeable batteries and the number of low-power batteries, and starting fast charging; S3, after updating the number of rechargeable batteries and the number of low-power batteries, return to step S2 until the voltage of the battery pack reaches the normal charging voltage for fast charging or the charging time for fast charging reaches a preset time; Step S2 includes the following steps: S20, determining a normal charging voltage for fast charging according to the initial charging voltage and the number of current rechargeable batteries; S21, determining whether the battery pack meets the repair charging condition, if yes, executing step S22, if no, executing step S24, wherein the repair charging condition includes: the number of the current low-power batteries is greater than the number of rechargeable batteries, or the estimated battery capacity Cg is less than the capacity threshold; S22, performing a repair charging for a preset repair time on the battery pack using a repair charging voltage that is lower than a normal charging voltage, and recording the accumulated repair charging time; S23, determining whether the accumulated repair charging time is less than the repair charging time threshold, if so, executing step S21, if not, executing step S1; S24, quickly charging the battery pack according to the normal charging voltage.

2. The method according to claim 1, characterized in that In step S1, a safe current is determined according to the estimated battery capacity, and a charging current for fast charging is set according to the safe current, including the following steps: Obtain the safety current corresponding to the estimated battery capacity by using a table lookup method; The smaller value between the safety current and the maximum output current of the charger is selected as the charging current for fast charging.

3. The method according to claim 1 or 2, characterized in that: After step S3, the method further comprises: S4, turn off the current output of the charger, turn on the dummy load and adjust the voltage of the dummy load to the rated voltage, measure the open circuit voltage after a preset time, re-estimate the battery capacity Cr based on the open circuit voltage, and then determine whether the jump condition is met. If yes, then execute step S5 or step S6; if no, then determine the safe current according to the re-estimated battery capacity Cr, and adjust the charging current of the fast charge according to the accumulated charging time, and then execute step S2; S5, is the charging current limit and The charging time is limited to limit the current and time. S6, with is the charging voltage limit and The charging current limit is set, and voltage and current limiting charging is performed, and the national standard high voltage timing is started.

4. The method according to claim 3, characterized in that In step S4, the jump condition includes: Condition 1: the number of low-power batteries is greater than the number of rechargeable batteries, and the duration of the state in which the number of low-power batteries is greater than the number of rechargeable batteries is greater than the jump time threshold; Condition 2: The number of times that the actual charging current during repair charging is less than the maximum charging current during repair charging is less than a preset number; Condition 3: The accumulated charging time is greater than the total charging time threshold; If any of the above jump conditions is met, step S5 or S6 is executed.

5. The method according to claim 3, characterized in that: The method further comprises: S7, with is the charging voltage limit and The charging current is limited to the voltage and current limit. , ; In step S6, when the charging current decreases to the limit value , execute step S7.

6. The method according to claim 5, characterized in that The method further comprises: S8, constant current and voltage limited charging, the charging current is equal to , , the charging voltage is less than or equal to the highest control voltage of a single battery; Among them, in step S6, when the national standard high-voltage timer exceeds the high-voltage time threshold, step S8 is executed; In step S7, when the charging current is reduced to the lamp turning current, or the national standard high voltage timer reaches the lamp turning time or high voltage time threshold, step S8 is executed.

7. The method according to claim 1 or 2, characterized in that: The method further comprises: During the entire charging process, high temperature protection operations are performed according to the temperature of the charger.

8. The method according to claim 1 or 2, characterized in that: In step S0 , if the number of times that the battery voltage is detected to be greater than the minimum starting voltage exceeds a preset number, the charger starts a standby procedure.

9. A charger, characterized in that: The charging control is performed using the charging method described in any one of claims 1 to 8.

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