A battery charging method

Abstract

The present application discloses a battery charging method, including: S11: charging the battery; S12: judging whether the battery needs to be desulfurized; S13: if desulfurization is required, desulfurizing the battery and returning to S12; S14: if desulfurization is not required, constant current charging the battery; S15: judging whether the first stage charging result of the battery meets the optimized absorption condition; S16: if it meets, entering the optimized absorption charging process; S17: judging whether the battery voltage is greater than or equal to the preset floating charge voltage point; S18: if it is greater than or equal to the floating charge voltage point, floating charging the battery. The present application has special judgments for different scenarios, so as to adapt to various scenarios, and ensures that the battery meets the charging requirements of each stage through sufficient judgments at each stage, ensures that the battery is a good battery, can be successfully charged, and can adjust the charging method in time according to the battery status, thereby improving the charging efficiency and safety.

Description

Technical Field

[0001] The present invention relates to the field of new energy, and in particular to a battery charging method. Background Art

[0002] With the advancement of science and technology, new energy vehicles have become widely popular and the automotive battery industry has developed rapidly. Since new energy vehicles rely on batteries, how to charge batteries efficiently and stably is a major research method for new energy vehicles to improve user experience.

[0003] Although the existing technology can provide reliable and stable charging, it cannot cope with complex situations, such as battery charging voltage mismatch, poor battery performance resulting in ineffective charging, or battery aging that is difficult to charge. At the same time, in order to ensure charging safety, it is also difficult to provide a fast charging method.

[0004] To this end, an efficient charging method is needed that can ensure stable charging and cope with complex situations. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a battery charging method that can ensure stable charging and can cope with complex situations. The specific scheme is as follows:

[0006] A battery charging method, comprising:

[0007] S11: receiving charging voltage selection information, and selecting a corresponding charging voltage to charge the battery;

[0008] S12: Determine whether the battery needs to be desulfurized;

[0009] S13: If desulfurization is required, desulfurization operation is performed on the battery, and the process returns to S12;

[0010] S14: If desulfurization is not required, the battery is charged with a constant current;

[0011] S15: Determine whether the first stage charging result of the battery meets the optimized absorption condition;

[0012] S16: If the optimized absorption condition is met, the optimized absorption charging process is entered, and the conduction angle of the charging power source is adjusted to a preset value according to the preset optimized mapping relationship between the voltage range and the conduction angle, so that the charging current gradually decreases during the charging process;

[0013] S17: Determine whether the battery voltage is greater than or equal to a preset floating charge voltage point;

[0014] S18: If it is greater than or equal to the floating charge voltage point, floating charge the battery.

[0015] Optionally, when the charging voltage is 12V, the process of determining whether the battery needs to be desulfurized includes:

[0016] Determining whether the battery is abnormal;

[0017] If the battery is normal, determining whether the pulse peak value of the charging voltage is at least higher than the current battery voltage of the battery by a preset first pulse difference;

[0018] If yes, then go to S13;

[0019] If not, determining whether the current battery voltage of the battery is greater than or equal to a first voltage threshold or whether the pulse peak value of the charging voltage is greater than or equal to a second voltage threshold;

[0020] If yes, then go to S14;

[0021] If not, determining whether the charging voltage matches the battery;

[0022] If they match, the process proceeds to S14.

[0023] Optionally, when the charging voltage is 6V, the process of determining whether the battery needs to be desulfurized includes:

[0024] Determining whether the battery is abnormal and whether the charging voltage matches the battery;

[0025] If the battery is normal and the charging voltage matches the battery, determining whether a pulse peak value of the charging voltage is at least higher than a current battery voltage of the battery by a second pulse difference;

[0026] If yes, then go to S13;

[0027] If not, go to S14.

[0028] Optionally, when in BOOST constant current charging, the process of performing constant current charging on the battery includes:

[0029] S51: determining whether the current battery voltage of the battery exceeds a preset ninth voltage threshold;

[0030] S52: If it exceeds, the battery is cyclically charged according to a preset cyclic charging rule;

[0031] S53: If it is not exceeded, fast charging the battery with a preset high current;

[0032] S54: Determine whether the fast charging time is greater than or equal to a preset fast charging time threshold;

[0033] S55: If it is greater than or equal to the fast charging time threshold, return to S52;

[0034] S56: If it is less than the fast charging time threshold, return to S51.

[0035] Optionally, the process of determining whether the first stage charging result of the battery meets the optimized absorption condition includes:

[0036] S61: suspending charging of the battery and determining whether the battery is abnormal;

[0037] S62: If normal, determining whether the current battery voltage of the battery is less than a preset eleventh voltage threshold;

[0038] S63: If it is greater than or equal to the eleventh voltage threshold, determining whether the current battery voltage of the battery is greater than or equal to a preset twelfth voltage threshold;

[0039] S64: If the current battery voltage of the battery is less than the twelfth voltage threshold, determining whether the pause time is greater than or equal to a preset standstill time threshold;

[0040] S65: If not exceeded, return to S151;

[0041] S66: If exceeded, enter S16.

[0042] Optionally, when in BOOST optimized absorption, if the optimized absorption condition is met, the optimized absorption charging process is entered, and the conduction angle of the charging power supply is adjusted to a preset value according to the optimized mapping relationship between the preset voltage range and the conduction angle, so that the charging current gradually decreases during the charging process, including:

[0043] Determining whether the battery is abnormal;

[0044] If the battery is normal, determining whether the battery voltage of the battery is greater than or equal to a preset thirteenth voltage threshold;

[0045] If it exceeds, setting the conduction angle of the charging power source to a preset first threshold;

[0046] If it does not exceed, the conduction angle of the charging power source is set to a preset second threshold.

[0047] Optionally, when the charging current is a preset high current charge or a BOOST float charge, the float charge process for the battery includes:

[0048] S801: Determine whether the battery is abnormal;

[0049] S802: If the battery is normal, determine whether the charging time is greater than or equal to a preset maximum floating charge time;

[0050] S803: If it is less than the maximum float charge time, determining whether the current battery voltage of the battery is greater than or equal to a preset fourteenth voltage threshold;

[0051] S804: If the voltage is less than the fourteenth voltage threshold, setting the conduction angle of the charging power source to a preset third threshold;

[0052] S805: If it is greater than or equal to the fourteenth voltage threshold, determining whether the real-time conduction angle of the charging power source is equal to the set value of the current conduction angle;

[0053] S806: If equal, determine whether the current battery voltage of the battery increases;

[0054] S807: If it increases, the setting value of the current conduction angle of the charging power source is reduced by a preset unit variable;

[0055] S808: If it does not increase, determining whether the real-time conduction angle of the charging power source is less than or equal to a preset minimum conduction angle;

[0056] S809: If no, return to S801;

[0057] S810: If yes, determine whether the time during which the real-time conduction angle of the charging power source is the minimum conduction angle exceeds a preset first time threshold;

[0058] S811: If not exceeded, return to S801.

[0059] Optionally, after floating charging the battery, the method further includes:

[0060] Determining whether the energy storage function of the battery is normal;

[0061] If normal, it will enter the power saving state.

[0062] Optionally, the process of determining whether the energy storage function of the battery is normal includes:

[0063] S101: After stopping charging, determining whether the battery is abnormal;

[0064] S102: If normal, determine whether the current battery voltage is less than a preset fifteenth voltage threshold;

[0065] S103: If it is not less than the fifteenth voltage threshold, determining whether the current battery voltage is greater than or equal to a preset sixteenth voltage threshold;

[0066] S104: If it is less than the sixteenth voltage threshold, determining whether the waiting time is greater than or equal to a preset fifth time threshold;

[0067] S105: If it is less than the fifth time threshold, return to S101;

[0068] S106: If the time is greater than or equal to the fifth time threshold, enter the power conservation state.

[0069] Optionally, the process of entering the power conservation state includes:

[0070] S110: After stopping charging, determining whether the battery is abnormal;

[0071] S111: If normal, determine whether the power outage duration is greater than or equal to the preset interval time;

[0072] S112: If it is less than the interval time, return to S111;

[0073] S113: If it is greater than or equal to the interval time, determining whether the current battery voltage is less than or equal to a seventeenth voltage threshold;

[0074] S114: If it is greater than or equal to the seventeenth voltage threshold, return to S111;

[0075] S115: If the voltage is less than the seventeenth voltage threshold, charging the battery;

[0076] S116: Determine whether the battery is abnormal;

[0077] S117: If normal, determine whether the current battery voltage is greater than or equal to a preset eighteenth voltage threshold;

[0078] S118: If it is less than the eighteenth voltage threshold, return to S114;

[0079] S119: If it is greater than or equal to the eighteenth voltage threshold, return to S110.

[0080] In the present invention, the battery charging method includes: S11: receiving charging voltage selection information, and selecting a corresponding charging voltage to charge the battery; S12: judging whether the battery needs desulfurization; S13: if desulfurization is required, performing a desulfurization operation on the battery and returning to S12; S14: if desulfurization is not required, performing constant current charging on the battery; S15: judging whether the first stage charging result of the battery meets the optimized absorption condition; S16: if the optimized absorption condition is met, entering the optimized absorption charging process, adjusting the conduction angle of the charging power supply to a preset value according to the optimized mapping relationship between the preset voltage range and the conduction angle, so that the charging current gradually decreases during the charging process; S17: judging whether the battery voltage is greater than or equal to a preset floating charge voltage point; S18: if it is greater than or equal to the floating charge voltage point, floating charging is performed on the battery.

[0081] The present invention has special judgments for different scenarios, so as to adapt to various scenarios. Through sufficient judgments at each stage, it ensures that the battery meets the charging requirements at each stage, ensures that the battery is a good battery, can be successfully charged, and can adjust the charging method in time according to the battery status, thereby improving charging efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0083] Figure 1 A schematic flow chart of a battery charging method disclosed in an embodiment of the present invention;

[0084] Figure 2 A schematic diagram of a 12V desulfurization judgment process disclosed in an embodiment of the present invention;

[0085] Figure 3 A schematic diagram of a 6V desulfurization judgment process disclosed in an embodiment of the present invention;

[0086] Figure 4 A schematic diagram of a desulfurization process disclosed in an embodiment of the present invention;

[0087] Figure 5 A schematic diagram of a BOOST constant current charging process disclosed in an embodiment of the present invention;

[0088] Figure 6 A schematic diagram of a 2A constant current charging process disclosed in an embodiment of the present invention;

[0089] Figure 7 A schematic diagram of a 10A constant current charging process disclosed in an embodiment of the present invention;

[0090] Figure 8 A schematic diagram of an optimized absorption judgment process disclosed in an embodiment of the present invention;

[0091] Fig. 9 A schematic diagram of a BOOST optimized absorption process disclosed in an embodiment of the present invention;

[0092] Fig.10 A schematic diagram of a 10A optimized absorption process disclosed in an embodiment of the present invention;

[0093] Fig.11 A schematic diagram of a 10A or BOOST floating charge process disclosed in an embodiment of the present invention;

[0094] Fig.12 A schematic diagram of a 2A floating charge process disclosed in an embodiment of the present invention;

[0095] Fig.13 A schematic diagram of a power conservation judgment process disclosed in an embodiment of the present invention;

[0096] Fig.14 A schematic diagram of a power conservation process disclosed in an embodiment of the present invention;

[0097] Fig.15 The present invention is a flowchart of another battery charging method disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0098] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0099] The embodiment of the present invention discloses a battery charging method, see Figure 1 As shown, the method includes:

[0100] S11: receiving charging voltage selection information, and selecting a corresponding charging voltage to charge the battery.

[0101] Specifically, the user can manually input the charging voltage selection information and select the subsequent charging voltage for the battery. Of course, after the battery is connected, the system can recommend a charging voltage corresponding to the battery for the user's reference and selection. After receiving the charging voltage selection information input by the user, the subsequent output charging voltage can be determined, and the charging steps can be performed on the battery to be charged.

[0102] S12: Determine whether the battery needs to be desulfurized.

[0103] Specifically, in order to be able to efficiently charge the battery later, it is first determined whether the battery needs to be desulfurized for various reasons, so as to decide whether to desulfurize the battery first, so as to make the battery state as healthy as possible, thereby achieving efficient charging later.

[0104] Specifically, whether the battery is normal or needs to be desulfurized can be determined based on the current battery voltage after the battery has been charged for a certain period of time.

[0105] S13: If desulfurization is required, desulfurization operation is performed on the battery and the process returns to S12.

[0106] Specifically, if it is determined that desulfurization is required, a preset desulfurization operation can be performed on the battery. The battery is desulfurized by shocking it with a pulse current to achieve the desulfurization operation, which mainly plays a role in activating the battery. Generally, a good battery that has been over-discharged can absorb electricity normally after desulfurization.

[0107] Specifically, after desulfurization, the process may return to S12 to determine whether desulfurization needs to be continued, or if desulfurization is successful and no desulfurization is needed, a subsequent charging determination may be performed.

[0108] S14: If desulfurization is not required, the battery is charged with a constant current.

[0109] It is understandable that after the battery is normal and does not need to be desulfurized, the battery can be normally charged with constant current. The constant current charging process can control the charging voltage by continuously adjusting the conduction angle and conduction time of the input power supply according to the battery status, thereby achieving constant current charging of the battery.

[0110] S15: Determine whether the first stage charging result of the battery meets the optimized absorption condition.

[0111] Specifically, after a certain period of continuous charging, the battery status, i.e., the result of the first stage charging, can be checked again to determine the battery charging effect, whether it is successfully and effectively charged, whether it is full, etc., and whether it is necessary to enter the subsequent optimized absorption process after successful charging.

[0112] Specifically, the charging result of the first stage may be the current battery voltage of the battery. By presetting various conditions, it is determined whether the current battery voltage of the battery meets the corresponding requirements, thereby determining whether the battery is normal, whether it is effectively charged, or whether the charging voltage matches, etc., and finally determining whether the optimized absorption conditions for entering the next optimized absorption process are met.

[0113] S16: If the optimized absorption condition is met, the optimized absorption charging process is entered, and the conduction angle of the charging power source is adjusted to a preset value according to the optimized mapping relationship between the preset voltage range and the conduction angle, so that the charging current gradually decreases during the charging process.

[0114] Specifically, if the optimized absorption conditions are met, the optimized absorption charging process is entered. During the optimized absorption process, the current decreases step by step. Different conduction angles are set according to different voltage ranges. When crossing the voltage range, the conduction angle gradually changes, thereby achieving the purpose of increasing the battery voltage and gradually reducing the current, gradually slowing down the charging rate to avoid subsequent overcharging.

[0115] It is understandable that if the optimized absorption conditions are not met, the battery can continue to be charged with a constant current and return to S14. Of course, if it is detected during the re-judgment process that the battery is damaged or the charging voltage does not match the battery, the charging is considered abnormal and the abnormality handling process is entered.

[0116] S17: Determine whether the battery voltage is greater than or equal to a preset floating charge voltage point;

[0117] S18: If it is greater than or equal to the floating charge voltage point, the battery is float charged.

[0118] Specifically, when the current battery voltage of the battery is greater than or equal to the preset floating charge voltage point V1, subsequent floating charge operations can be performed. The floating charge voltage point is set in combination with the rated voltage of the battery. Therefore, when the battery voltage reaches the floating charge voltage point, the continuous charging process can be stopped to avoid overcharging.

[0119] It can be seen that the embodiments of the present invention have special judgments for different scenarios, so as to adapt to various scenarios. Through sufficient judgment at each stage, it ensures that the battery meets the charging requirements of each stage, ensures that the battery is a good battery, can be successfully charged, and can adjust the charging method in time according to the battery status, thereby improving charging efficiency and safety.

[0120] The embodiment of the present invention discloses a specific battery charging method. Compared with the previous embodiment, this embodiment further illustrates and optimizes the technical solution. Figure 2 As shown, specifically:

[0121] Specifically, when the charging voltage is 12V, the process of determining whether the battery needs to be desulfurized in S12 may include S21 to S27; wherein,

[0122] S21: Determine whether the battery is abnormal.

[0123] It is understandable that before determining whether the battery needs to be desulfurized, first determine whether the battery is abnormal. If the battery itself has defects and cannot be charged or used, no subsequent operation and judgment are required, and the corresponding abnormal operation can be performed. If the battery has no abnormality, subsequent judgment can be made in order to charge the battery.

[0124] S22: If the battery is normal, determine whether the pulse peak value of the charging voltage is at least higher than the current battery voltage of the battery by a preset first pulse difference.

[0125] Specifically, after a preliminary determination that the battery is normal, the battery can be pre-charged with a preset current value. After reaching a preset first pre-charge time, it is determined whether a pulse peak value of the charging voltage is at least higher than a current battery voltage of the battery by a preset first pulse difference, so as to determine whether the battery needs desulfurization. If the pulse peak value is greater than or equal to the preset first pulse difference than the current battery voltage, the battery needs to be desulfurized. For example, the preset first pulse difference may be 3V, the pulse peak value is 9V, and the current battery voltage is 6V. The pulse peak value of the charging voltage is 3V higher than the current battery voltage of the battery, and it is determined that the battery needs to be desulfurized.

[0126] Among them, before desulfurization, during the pre-charging period, the power frequency transformer of the power supply can convert and output a pre-charging current of 5A. Before reaching the first pre-charging time of 10S in this example, it can be repeatedly determined whether the battery is normal to prevent the battery from suddenly failing during the pre-charging period without knowing it.

[0127] Specifically, when the battery completes the pre-charging process, desulfurization judgment can be performed. The power frequency transformer of the power supply outputs power frequency pulse current while controlling the conduction angle. The battery voltage and ripple peak data can be collected based on the voltage waveform at the output end. Therefore, it can be determined whether the pulse peak of the charging voltage is at least higher than the current battery voltage of the battery by the second pulse difference.

[0128] Specifically, based on the analysis of a large number of test results, combined with the battery voltage and ripple pulse, various thresholds for battery determination and voltage thresholds for determining whether the battery needs repair can be preferably set.

[0129] Specifically, if the battery has a low current absorption capacity, the actual output current is low when the conduction angle remains unchanged, and a higher ripple peak value can be detected. Since the cost of detecting power frequency current is high, we determine the result by detecting the ripple voltage.

[0130] Specifically, for the industrial frequency current of 0 to 5A, the pulse peak value can be set ≥ the current battery voltage + 3V, which is the threshold for the battery to be repaired. Some batteries with very small capacity may also be included, and the desulfurization process can be skipped through subsequent voltage increase.

[0131] S23: If yes, go to S13;

[0132] S24: If not, determine whether the current battery voltage of the battery is greater than or equal to the first voltage threshold or whether the pulse peak value of the charging voltage is greater than or equal to the second voltage threshold.

[0133] Specifically, before performing constant current charging, in order to ensure that the charging mode matches the rated charging voltage of the battery, for example, the 12V charging mode corresponds to a battery with a rated charging voltage of 12V, rather than a battery with a rated charging voltage of 6V, a judgment is made based on whether the current battery voltage of the battery is greater than or equal to a first voltage threshold or whether the pulse peak value of the charging voltage is greater than or equal to a second voltage threshold. If the charging voltage is correctly matched, then after the aforementioned pre-charging, the current battery voltage of the normal battery can reach the first voltage threshold, or the pulse peak value of the charging voltage during charging can be greater than or equal to the second voltage threshold. Therefore, the above judgment can determine whether the charging voltage matches the battery and whether the subsequent constant current charging process can be entered.

[0134] Specifically, when the charging voltage is 12V, the preferred first voltage threshold may be 9V, and the preferred second voltage threshold may be 11V.

[0135] S25: If yes, go to S14;

[0136] S26: If not, determine whether the charging voltage matches the battery.

[0137] Specifically, after the above-mentioned constant current charging judgment is not met, it can be specifically judged whether the charging voltage matches the battery, because it is possible that the rated charging voltage of the battery is not 12V, for example, the rated charging voltage of the battery is 6V, so small current charging can be performed to avoid overcharging or misjudgment caused by large current charging. After charging for a certain period of time, if the battery voltage ≥ the first voltage threshold, it can be determined that the 12V battery charging voltage matches, otherwise the charging voltage does not match, and it is very likely a 6V battery.

[0138] Among them, according to the closing of the power frequency output, the switching power supply output and DOE (DESIGN OF EXPERIMENT) considerations, it is possible to charge for 3 hours with a small current of 2A, during which time it is determined whether the battery voltage is ≥ the first voltage threshold.

[0139] Specifically, the specific process of determining whether the charging voltage matches the battery may include S261 to S267, see Figure 3 As shown,

[0140] S261: If no, determine whether the battery is abnormal.

[0141] Specifically, if the condition in S24 is not met, it is determined whether the battery is abnormal or a good battery. If so, the abnormal process is entered.

[0142] Specifically, the current battery level of the battery can be used to determine whether the battery is a good battery or a bad battery. If the battery is still a bad battery, the charging voltage will be close to the preset fault voltage. For example, according to the negative feedback characteristics of the switching power supply, the fault voltage can be set to 16.5V. If the current that the battery can absorb is less than 2A, the charging voltage tends to be close to the maximum set voltage of 16.5V to ensure feedback stability. At this time, if the battery is a bad battery, the abnormal program will be directly entered and an error will be directly reported.

[0143] S262: If not, the battery is continuously charged with a preset small current.

[0144] Specifically, if the battery is normal, the battery is continuously charged with a preset small current, for example, continuously charged with a current of 2A.

[0145] S263: Determine whether the current battery voltage of the battery is greater than or equal to a third voltage threshold.

[0146] Specifically, during continuous charging with a small current, it is determined whether the current battery voltage of the battery is greater than or equal to a third voltage threshold, so as to determine whether the charging voltage matches the battery. The third voltage threshold can be set to 9V.

[0147] S264: If yes, go to S14;

[0148] S265: If not, determine whether the current charging time exceeds the preset first charging time.

[0149] Specifically, charging is continued before reaching a preset first charging time, during which it is determined whether the current battery voltage reaches a third voltage threshold within the first charging time. When the first charging time is exceeded and the current battery voltage still does not reach the third voltage threshold, it means that the rated charging voltage of the battery does not match the current charging voltage, and the user needs to reselect the charging voltage.

[0150] Among them, the first charging time can be set to 3 hours to avoid the user waiting for too long, while also ensuring that the charging time is sufficient.

[0151] S266: If the first charging time has not been exceeded, return to S261.

[0152] Specifically, if the first charging time is not exceeded, the process returns to S261 to continue judging.

[0153] S267: If the first charging time is exceeded, it is determined that the charging voltage does not match the battery.

[0154] Specifically, when the process proceeds to S267, it indicates that the first charging time has been exceeded and the current battery voltage has not reached the third voltage threshold, and therefore, it is determined that the charging voltage does not match the battery.

[0155] S27: If matched, go to S14.

[0156] It can be understood that if the charging voltage matches, the process enters S14 to continue constant current charging.

[0157] For further information, see Figure 4 As shown, when the charging voltage is 6V, the process of judging whether the battery needs to be desulfurized includes S31 to S34; wherein,

[0158] S31: Determine whether the battery is abnormal and whether the charging voltage matches the battery.

[0159] Specifically, it is possible to first determine whether the battery is abnormal. If it is normal, then determine whether the charging voltage matches the battery. The determination process may include first performing pre-charging, using a preset charging current, such as 5A, for pre-charging, and determining whether the current battery voltage of the pre-charged battery is greater than or equal to a preset fourth voltage threshold, such as 9V. If the current battery voltage is greater than or equal to the fourth voltage threshold, it is considered that the voltage mode does not match, that is, the current charging voltage does not match the rated charging voltage of the battery. If the current battery voltage is less than the preset fourth voltage threshold, then determine whether the current battery voltage is greater than or equal to the preset fifth voltage threshold and whether the pulse peak value of the charging voltage is greater than or equal to the sixth voltage threshold. If both are greater than or equal to, it also indicates that the charging voltage does not match. If both are less than, determine whether the charging time exceeds the preset second pre-charging time. If it exceeds, continue to execute S32. If it does not exceed, continue charging. During this period, it is possible to continue to determine whether the battery is abnormal and whether the charging voltage matches the battery until the second pre-charging time is reached.

[0160] S32: If the battery is normal and the charging voltage matches the battery, determine whether the pulse peak value of the charging voltage is at least higher than the current battery voltage of the battery by a second pulse difference.

[0161] Specifically, by judging whether the pulse peak value of the charging voltage is at least higher than the current battery voltage of the battery by a second pulse difference, it is judged whether the battery needs to be desulfurized, and the second pulse difference may also be 3V.

[0162] S33: If yes, go to S13;

[0163] S34: If no, go to S14.

[0164] Furthermore, the present invention also discloses a specific battery charging method, see Figure 5 As shown, the method includes:

[0165] Specifically, the above-mentioned S13 desulfurization process can be as follows Figure 5 As shown, it includes S41 to S45; wherein,

[0166] S41: Determine whether the battery is abnormal;

[0167] S42: If normal, charge the battery with a preset pulse current.

[0168] Specifically, under the condition that the battery is normal, the battery can be subjected to impact charging with a 10A pulse current of 1S at intervals of 1S each and for desulfurization operation.

[0169] S43: Determine whether the current battery voltage of the battery is greater than or equal to a preset seventh voltage threshold.

[0170] Specifically, by judging whether the current battery voltage is greater than or equal to the preset seventh voltage threshold, it is judged whether the battery has completed desulfurization, and subsequent constant current charging can be performed. When the charging voltage is 12V, the seventh voltage threshold can be 13V, and when the charging voltage is 6V, the seventh voltage threshold can be 6.5V.

[0171] S44: If greater than or equal to, execute S14;

[0172] S45: If it is not greater than or equal to, determine whether the preset maximum desulfurization time has been reached.

[0173] Specifically, the maximum desulfurization time is 2 hours in the 2A charging mode, 30 minutes in the 10A charging mode, and 30 minutes in the BOOST charging mode.

[0174] S46: If not reached, return to S41;

[0175] S47: If reached, when the charging voltage is 6V, return to S12; when the charging voltage is 12V, determine whether the current battery voltage is less than the preset eighth voltage threshold;

[0176] S48: If it is less than the eighth voltage threshold, return to S12;

[0177] S49: If it is greater than the eighth voltage threshold, return to S14.

[0178] Specifically, the eighth voltage threshold can be 9V. The eighth voltage threshold can be used to determine whether the charging voltage matches the rated voltage of the battery. When the charging voltage is 12V, by judging whether the current battery voltage is less than 9V, it can be determined whether the battery is a 12V battery or a 6V battery, thereby deciding whether to perform constant current charging.

[0179] Furthermore, the present invention also discloses a specific battery charging method, see Figure 6 As shown, the method includes:

[0180] Specifically, when in BOOST constant current charging, the process of performing constant current charging on the battery in S14 may specifically include S51 to S56; wherein,

[0181] S51: Determine whether the current battery voltage of the battery exceeds a preset ninth voltage threshold.

[0182] Specifically, the ninth voltage threshold is used to infer the current battery charging status. If the current battery charging capacity is low, the current battery voltage is lower than the ninth voltage threshold, and fast charging can be performed. If it is greater than or equal to the ninth voltage threshold, it means that the battery is almost fully charged, and charging is performed in other ways. Among them, the ninth voltage threshold can be 6V when the rated charging voltage of the battery is 6V, and can be 12.5V when the rated charging voltage of the battery is 12.5V.

[0183] S52: If it is greater than or equal to, the battery is cyclically charged according to a preset cyclic charging rule.

[0184] Specifically, Figure 6 As shown, different charging currents can be used to correspond to different charging times, and charging can be performed cyclically. The charging time and the current battery voltage change can be continuously judged. Once the constant current charging condition is no longer met, the next step S15 is entered to perform the optimized absorption process.

[0185] Specifically, the cyclic charging process can be to charge at 50A for 120 seconds, then charge at 40A for 60 seconds, then charge at 30A, 20A, 30A, and 40A for 50 seconds each, and then return to charging at 50A for 120 seconds. After that, it is determined whether the battery is abnormal. If normal, it is determined whether the current battery voltage is greater than or equal to the preset tenth voltage threshold. If the current battery voltage is greater than or equal to the tenth voltage threshold, enter S15. If less than, continue to determine whether the charging time is greater than or equal to the constant current charging maximum time T1. If greater than or equal to, enter S15. If less than, continue the cyclic charging and return to S52.

[0186] Among them, the maximum constant current charging time can be set to 8 hours in 2A charging mode, 5 hours in 10A charging mode, and 2 hours in BOOST charging mode.

[0187] S53: If it is less than, the battery is fast charged with a preset high current;

[0188] S54: Determine whether the fast charging time is greater than or equal to a preset fast charging time threshold;

[0189] S55: If it is greater than or equal to the fast charge time threshold, return to S52;

[0190] S56: If it is less than the fast charging time threshold, return to S51.

[0191] Specifically, the large current can be set to 30A, and the fast charging time threshold can be 30 minutes. When the preset fast charging time threshold is reached, the battery is usually fully charged to a certain extent. Therefore, the charging can be continued in a cyclic charging manner to avoid the process. If it is less than the fast charging time threshold, continue to fast charge until the time is reached or the current battery voltage no longer meets the ninth voltage threshold.

[0192] For further information, see Figure 7 and Figure 8 It can be seen that when charging at a constant current of 2A or 10A, different voltage judgment thresholds and constant current charging maximum times are used to determine whether to continue constant current charging and whether to jump out and enter S15.

[0193] Among them, the voltage judgment threshold includes: Figure 7 and Figure 8 The 14V or 7V shown are for batteries with a charging voltage of 12 or 6V respectively.

[0194] Furthermore, the present invention also discloses a specific battery charging method, see Fig. 9 As shown, the method includes:

[0195] Specifically, the process of determining whether the first stage charging result of the battery meets the optimized absorption condition in the aforementioned S15 includes S61 to S66; wherein,

[0196] S61: suspend charging the battery and determine whether the battery is abnormal;

[0197] S62: If normal, determine whether the current battery voltage of the battery is less than a preset eleventh voltage threshold.

[0198] Specifically, the battery voltage of a bad battery will drop rapidly after charging stops. Therefore, by judging whether the current battery voltage is greater than or equal to the preset eleventh voltage threshold, it can be judged whether the battery is a good battery. The eleventh voltage threshold can be set to 12V or 6V according to the rated charging voltage of the battery, where 12V corresponds to a 12V battery and 6V corresponds to a 6V battery.

[0199] Specifically, if the current battery voltage is less than the preset eleventh voltage threshold, it means that the battery is losing power quickly and the battery is a bad battery, and charging needs to be stopped and an abnormal response needs to be performed.

[0200] S63: If it is greater than or equal to the eleventh voltage threshold, determine whether the current battery voltage of the battery is greater than or equal to a preset twelfth voltage threshold.

[0201] Specifically, after determining whether the battery is a bad battery, the twelfth voltage threshold is used to determine whether the charging voltage matches. As the charging process progresses, the characteristics reflected by the battery at each stage are different. Therefore, it is necessary to ensure at any time whether the charging voltage of the battery is consistent with the rated charging voltage, so it is determined again whether the charging voltage is consistent.

[0202] Among them, when the charging voltage is 6V, the twelfth voltage threshold is 8V, and when the charging voltage is 12V, the twelfth voltage threshold is 16V.

[0203] S64: If the current battery voltage of the battery is less than a twelfth voltage threshold, determining whether the pause time is greater than or equal to a preset standstill time threshold;

[0204] S65: If not exceeded, return to S61;

[0205] S66: If exceeded, enter S16.

[0206] Specifically, by judging whether the static time threshold is exceeded, charging is stopped during the static time to judge whether the battery is a bad battery and whether the charging voltage matches. When the static time is exceeded, it means that there is no problem with the battery and the optimization absorption process can continue. The static time can be 10S.

[0207] Furthermore, the present invention also discloses a specific battery charging method, see Fig.10 As shown, the method includes:

[0208] Specifically, when in BOOST optimized absorption, if the optimized absorption condition is met in the aforementioned S16, the optimized absorption charging process is entered, and the conduction angle of the charging power supply is adjusted to a preset value according to the optimized mapping relationship between the preset voltage range and the conduction angle, so that the charging current gradually decreases during the charging process, including S71 to S74; wherein,

[0209] S71: Determine whether the battery is abnormal;

[0210] S72: If the battery is normal, determine whether the battery voltage of the battery is greater than or equal to a preset thirteenth voltage threshold;

[0211] S73: If it exceeds, setting the conduction angle of the charging power source to a preset first threshold;

[0212] S74: If it is not exceeded, setting the conduction angle of the charging power source to a preset second threshold.

[0213] Specifically, in order to achieve a step-down of the current, different conduction angles are set according to different voltage ranges. When crossing the voltage range, the conduction angle changes gradually, thereby achieving the purpose of increasing the battery voltage and gradually reducing the current. Therefore, according to the judgment result of S72, different conduction angles of the charging power supply are set, and the floating charge state is entered after the current battery voltage exceeds the floating charge voltage point.

[0214] For details, see Fig.11 As shown, when the charging current is 10A, before the current battery voltage is greater than or equal to the preset floating charge voltage point, the conduction angle of the charging power supply is set to the preset third threshold value, see Fig.12 As shown, when the charging current is 2A, before the current battery voltage is greater than or equal to the floating charge voltage point V1, constant current charging is performed with a preset second charging current, and the second charging current can be 1.5A. The floating charge voltage point V1 can be set to different values ​​in different modes, for example, 14.3V / 7.1V for STD (standard mode) type, 14.4V / 7.2V for GEL (colloidal sealed lead battery) type, and 14.6V / 7.4V for AGM (Absorbent Glass Mat (AGM) Battery) type.

[0215] Furthermore, the present invention also discloses a specific battery charging method, see Fig.13 As shown, the method includes:

[0216] Specifically, when the charging current is a preset high current charge or BOOST float charge, the aforementioned S17 performs a float charge process on the battery, including S801 to S811; wherein,

[0217] S801: Determine whether the battery is abnormal;

[0218] S802: If the battery is normal, determine whether the float charge time is greater than or equal to a preset maximum float charge time.

[0219] Specifically, it is determined whether the floating charge time after being in the floating charge state is greater than or equal to the preset floating charge maximum time T3. If so, the floating charge can be exited to enter the subsequent state.

[0220] Among them, the maximum float charge time can be set to 8 hours in 2A charging mode, 5 hours in 10A charging mode, and 3 hours in BOOST charging mode.

[0221] S803: If it is less than the maximum floating charge time, determine whether the current battery voltage of the battery is greater than or equal to a preset fourteenth voltage threshold.

[0222] S804: If it is less than the fourteenth voltage threshold, setting the conduction angle of the charging power source to a preset third threshold;

[0223] S805: If it is greater than or equal to the fourteenth voltage threshold, determine whether the real-time conduction angle of the charging power source is equal to the set value of the current conduction angle.

[0224] Specifically, if the current battery voltage is less than the fourteenth voltage threshold, the conduction angle of the charging power supply is set to the preset third threshold to increase the charging voltage, so that the battery voltage increases to the fourteenth voltage threshold and remains at a fixed point, but does not exceed the maximum charging voltage that the battery can withstand, so as to achieve continuous floating charge. If the current battery voltage is greater than or equal to the fourteenth voltage threshold, it is determined whether the real-time conduction angle is equal to the set value of the current conduction angle, and whether the conduction angle setting of the charging power supply is accurate. If not, it returns to S801 to reset the conduction angle based on the current battery voltage based on S802.

[0225] Among them, the fourteenth voltage threshold can be set separately according to the battery type and the rated charging voltage supported by the battery. For example, the STD (standard mode) type is 14.4V / 7.2V, the GEL (gel sealed lead acid battery) type is 14.5V / 7.3V, and the AGM (Absorbent Glass Mat (AGM) Battery) type is 14.8V / 7.5V.

[0226] S806: If equal, determine whether the current battery voltage of the battery increases;

[0227] S807: If it increases, the setting value of the current conduction angle of the charging power source is reduced by a preset unit variable.

[0228] Specifically, if the battery voltage still increases after the conduction angle is changed, it is necessary to continue to reduce the conduction angle to prevent the battery voltage from continuing to increase and causing damage. Before the conduction angle is reduced to the minimum conduction angle, the conduction angle can be continuously reduced in a cycle. Therefore, only the preset unit variable is reduced each time, for example, the conduction angle is reduced by one each time.

[0229] S808: If it does not increase, determine whether the real-time conduction angle of the charging power source is less than or equal to a preset minimum conduction angle.

[0230] S809: If not, return to S801.

[0231] Specifically, if the real-time conduction angle of the charging power source is not less than or equal to the preset minimum conduction angle, there is still room for further adjustment, and the floating charge state can be maintained, returning to S801 without exiting the floating charge state.

[0232] S810: If yes, determine whether the time during which the real-time conduction angle of the charging power source is the minimum conduction angle exceeds a preset first time threshold.

[0233] Specifically, after the real-time conduction angle is less than or equal to the preset minimum conduction angle, the first time threshold is maintained to prevent a small-capacity battery or a full battery from exiting the floating charge state too quickly, wherein the first time threshold may be 60 seconds.

[0234] S811: If not exceeded, return to S801.

[0235] Specifically, during the floating charge stage, the current that the battery can absorb will gradually decrease. When the current that the battery can absorb is less than the floating charge critical current A1 or is greater than or equal to the floating charge maximum time, it is considered to be full and can enter the next stage. The floating charge critical current A1 can be set to 2A.

[0236] Furthermore, an embodiment of the present invention also discloses a specific battery charging method, which includes:

[0237] Specifically, after the battery is float charged, the fully charged battery may enter a power conservation process in S91 and S92; wherein,

[0238] S91: Determine whether the energy storage function of the battery is normal.

[0239] Specifically, in order to ensure that the battery can store electricity normally after floating charge, and then judge whether the battery's energy storage function is normal, it is also judged according to the change of battery voltage after stopping charging. For the specific judgment process, see Fig.14 As shown, it may include S101 to S107; wherein,

[0240] S101: After stopping charging, determine whether the battery is abnormal;

[0241] S102: If normal, determine whether the current battery voltage is less than a preset fifteenth voltage threshold.

[0242] Specifically, the fifteenth voltage threshold may be 12 / 6V according to the charging voltage change selected in the charging mode. If S101 determines that the battery is abnormal, the abnormality handling process is entered.

[0243] S103: If it is not less than the fifteenth voltage threshold, determine whether the current battery voltage is greater than or equal to a preset sixteenth voltage threshold.

[0244] Specifically, when the charging voltage is 6 V, the sixteenth voltage threshold may be 8 V, and when the charging voltage is 12 V, the sixteenth voltage threshold may be 16 V. If S102 determines that the current battery voltage is greater than or equal to the fifteenth voltage threshold, it indicates that the battery is a bad battery.

[0245] S104: If it is less than the sixteenth voltage threshold, determine whether the waiting time is greater than or equal to a preset fifth time threshold.

[0246] Specifically, the fifth time threshold may be set to 120S. If S103 determines that the voltage is greater than or equal to the preset sixteenth voltage threshold, it means that the battery does not match the current charging voltage, and the charging voltage mode does not match.

[0247] S105: If it is less than the fifth time threshold, return to S101;

[0248] S106: If the time is greater than or equal to the fifth time threshold, enter the power conservation state.

[0249] S92: If the energy storage function of the battery is normal, the power conservation state is entered.

[0250] For details, see Fig.15 As shown, the specific working process of the power conservation state may include S110 to S119; wherein,

[0251] S110: After stopping charging, determine whether the battery is abnormal;

[0252] S111: If normal, determine whether the power outage duration is greater than or equal to the preset interval time;

[0253] S112: If it is less than the interval time, return to S111;

[0254] S113: If it is greater than or equal to the interval time, determine whether the current battery voltage is less than or equal to the seventeenth voltage threshold;

[0255] S114: If it is greater than or equal to the seventeenth voltage threshold, return to S111;

[0256] S115: If the voltage is less than the seventeenth voltage threshold, charging the battery;

[0257] S116: Determine whether the battery is abnormal;

[0258] S117: If normal, determine whether the current battery voltage is greater than or equal to a preset eighteenth voltage threshold;

[0259] S118: If it is less than the eighteenth voltage threshold, return to S114;

[0260] S119: If it is greater than or equal to the eighteenth voltage threshold, return to S110.

[0261] Specifically, the power preservation process is equivalent to judging whether the current battery voltage of the battery is less than or equal to the preset seventeenth voltage threshold at each preset interval after stopping charging. If it is less than, charging is required to keep the battery fully charged. After charging, judging whether the current battery voltage is greater than or equal to the preset eighteenth voltage threshold. If it is greater than or equal to, charging is stopped and the judgment is repeated to avoid overcharging of the battery.

[0262] Among them, the interval time can be set to 120S, the seventeenth voltage threshold can be set to 13V or 6.5V. According to the charging mode selection, a 12V battery can correspond to 13V, and a 6V battery can correspond to 6.5V. The eighteenth voltage threshold can be 14.4V when the battery is a 12V battery, and can be 7.2V when the battery is a 6V battery.

[0263] It can be understood that by combining all the above embodiments, the following can be finally obtained: Fig.15 The battery charging method shown, wherein Analysis 1 corresponds to Figure 2 And the process from S21 to S27, including S261 to S267, desulfurization corresponds to the aforementioned desulfurization process, constant current charging corresponds to the aforementioned constant current charging process of various conditions, analysis 2 corresponds to Figure 8 , the process from S61 to S66, optimization absorption, floating charge and power conservation correspond to the above-mentioned optimization absorption process, floating charge process and power conservation state respectively, and the analysis of 3 corresponds to Fig.13 , the process of S92 includes S101 to S107.

[0264] It should be noted that all embodiments of the present invention can be applied to vehicle-mounted battery charging control.

[0265] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0266] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0267] The technical content provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for general technical personnel in the field, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery charging method, characterized in that: include: S11: receiving charging voltage selection information, and selecting a corresponding charging voltage to charge the battery; S12: Determine whether the battery needs to be desulfurized; S13: If desulfurization is required, desulfurization operation is performed on the battery, and the process returns to S12; S14: If desulfurization is not required, the battery is charged with a constant current; S15: Determine whether the first stage charging result of the battery meets the optimized absorption condition; S16: If the optimized absorption condition is met, the optimized absorption charging process is entered, and the conduction angle of the charging power source is adjusted to a preset value according to the preset optimized mapping relationship between the voltage range and the conduction angle, so that the charging current gradually decreases during the charging process; S17: Determine whether the battery voltage is greater than or equal to a preset floating charge voltage point; S18: If the voltage is greater than or equal to the floating charge voltage point, floating charge the battery; Wherein, when the charging voltage is 12V, the process of determining whether the battery needs to be desulfurized includes: Determining whether the battery is abnormal; If the battery is normal, determining whether the pulse peak value of the charging voltage is at least higher than the current battery voltage of the battery by a preset first pulse difference; If yes, then go to S13; If not, determining whether the current battery voltage of the battery is greater than or equal to a first voltage threshold or whether the pulse peak value of the charging voltage is greater than or equal to a second voltage threshold; If yes, then go to S14; If not, determining whether the charging voltage matches the battery; If it matches, go to S14; Wherein, when the charging voltage is 6V, the process of determining whether the battery needs to be desulfurized includes: Determining whether the battery is abnormal and whether the charging voltage matches the battery; If the battery is normal and the charging voltage matches the battery, determining whether a pulse peak value of the charging voltage is at least higher than a current battery voltage of the battery by a second pulse difference; If yes, then go to S13; If not, go to S14; Wherein, when in BOOST constant current charging, the process of performing constant current charging on the battery includes: S51: determining whether the current battery voltage of the battery exceeds a preset ninth voltage threshold; S52: If it exceeds, the battery is cyclically charged according to a preset cyclic charging rule; S53: If it is not exceeded, fast charging the battery with a preset high current; S54: Determine whether the fast charging time is greater than or equal to a preset fast charging time threshold; S55: If it is greater than or equal to the fast charging time threshold, return to S52; S56: If it is less than the fast charging time threshold, return to S51; The process of determining whether the first stage charging result of the battery meets the optimized absorption condition includes: S61: suspending charging of the battery and determining whether the battery is abnormal; S62: If normal, determining whether the current battery voltage of the battery is less than a preset eleventh voltage threshold; S63: If it is greater than or equal to the eleventh voltage threshold, determining whether the current battery voltage of the battery is greater than or equal to a preset twelfth voltage threshold; S64: If the current battery voltage of the battery is less than the twelfth voltage threshold, determining whether the pause time is greater than or equal to a preset standstill time threshold; S65: If not exceeded, return to S61; S66: If exceeded, enter S16.

2. The battery charging method according to claim 1, characterized in that: When in BOOST optimized absorption, if the optimized absorption condition is met, the optimized absorption charging process is entered, and the conduction angle of the charging power supply is adjusted to a preset value according to the optimized mapping relationship between the preset voltage range and the conduction angle, so that the charging current gradually decreases during the charging process, including: Determining whether the battery is abnormal; If the battery is normal, determining whether the battery voltage of the battery is greater than or equal to a preset thirteenth voltage threshold; If it exceeds, setting the conduction angle of the charging power source to a preset first threshold; If it does not exceed, the conduction angle of the charging power source is set to a preset second threshold.

3. The battery charging method according to claim 1, characterized in that: When the charging current is a preset high current charge or a BOOST float charge, the float charge process for the battery includes: S801: Determine whether the battery is abnormal; S802: If the battery is normal, determine whether the charging time is greater than or equal to a preset maximum floating charge time; S803: If it is less than the maximum float charge time, determining whether the current battery voltage of the battery is greater than or equal to a preset fourteenth voltage threshold; S804: If the voltage is less than the fourteenth voltage threshold, setting the conduction angle of the charging power source to a preset third threshold; S805: If it is greater than or equal to the fourteenth voltage threshold, determining whether the real-time conduction angle of the charging power source is equal to the set value of the current conduction angle; S806: If equal, determine whether the current battery voltage of the battery increases; S807: If it increases, the setting value of the current conduction angle of the charging power source is reduced by a preset unit variable; S808: If it does not increase, determining whether the real-time conduction angle of the charging power source is less than or equal to a preset minimum conduction angle; S809: If no, return to S801; S810: If yes, determine whether the time during which the real-time conduction angle of the charging power source is the minimum conduction angle exceeds a preset first time threshold; S811: If not exceeded, return to S801.

4. The battery charging method according to claim 1, characterized in that: After the battery is float charged, the method further comprises: Determining whether the energy storage function of the battery is normal; If normal, it will enter the power saving state.

5. The battery charging method according to claim 4, characterized in that: The process of determining whether the energy storage function of the battery is normal includes: S101: After stopping charging, determining whether the battery is abnormal; S102: If normal, determine whether the current battery voltage is less than a preset fifteenth voltage threshold; S103: If it is not less than the fifteenth voltage threshold, determining whether the current battery voltage is greater than or equal to a preset sixteenth voltage threshold; S104: If it is less than the sixteenth voltage threshold, determining whether the waiting time is greater than or equal to a preset fifth time threshold; S105: If it is less than the fifth time threshold, return to S101; S106: If the time is greater than or equal to the fifth time threshold, enter the power conservation state.

6. The battery charging method according to claim 4, characterized in that: The process of entering the power conservation state includes: S110: After stopping charging, determining whether the battery is abnormal; S111: If normal, determine whether the power outage duration is greater than or equal to the preset interval time; S112: If it is less than the interval time, return to S111; S113: If it is greater than or equal to the interval time, determining whether the current battery voltage is less than or equal to a seventeenth voltage threshold; S114: If it is greater than or equal to the seventeenth voltage threshold, return to S111; S115: If the voltage is less than the seventeenth voltage threshold, charging the battery; S116: Determine whether the battery is abnormal; S117: If normal, determine whether the current battery voltage is greater than or equal to a preset eighteenth voltage threshold; S118: If it is less than the eighteenth voltage threshold, return to S114; S119: If it is greater than or equal to the eighteenth voltage threshold, return to S110.

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