Charging method, charging terminal and computer-readable storage medium to resist mains fluctuation

Abstract

The present invention discloses a charging method, a charging terminal and a computer-readable storage medium that resists fluctuations in mains electricity. The method comprises: dividing the charging process of a battery pack into multiple charging stages, each stage using a different charging current; when the charging process is interrupted and restored, the range points of the multiple charging stages are adjusted downward to divide a new charging stage range, and after re-judging the charging stage that the current battery pack is in, the battery pack is charged using the charging current corresponding to the charging stage. The present invention avoids the problem that the battery pack voltage drops due to the interruption of the charging process, which affects the battery management system's judgment of the current battery pack charging current, causing the current charging stage to be judged as the previous charging stage, resulting in excessive charging current, making the battery unable to be fully charged and posing a safety hazard.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a charging method for resisting mains power fluctuation, a charging terminal and a computer-readable storage medium. Background Art

[0002] The charging method currently commonly used in batteries is to charge continuously to a certain potential with a preset constant current, then gradually reduce the current, and stop charging when the set charging cut-off voltage is reached. However, if the current charging method is used during charging, if the mains voltage fluctuates greatly, the charging will be intermittent, which will lead to insufficient charging capacity or overcharging, resulting in the battery not being fully charged and there are certain safety hazards. Summary of the invention

[0003] The main purpose of the present invention is to provide a charging method, a charging terminal and a computer-readable storage medium that are resistant to mains fluctuations, aiming to solve the problem of insufficient charging capacity or overcharging when the mains voltage fluctuates greatly during battery charging, resulting in intermittent charging.

[0004] To achieve the above object, the present invention provides a charging method for resisting mains power fluctuations, the charging method for resisting mains power fluctuations comprising:

[0005] When the battery pack is interrupted during the charging process, the initial stage range is used, and the initial stage range is the stage range after the staged charging cut-off stage is readjusted;

[0006] After charging is resumed, the maximum voltage of the current single battery in the battery pack is re-determined;

[0007] Determine, according to the maximum voltage, a current charging stage within the initial stage range after the battery pack is restored from interruption, and charge the battery pack using a current corresponding to the current charging stage;

[0008] When the voltage of any single battery in the battery pack reaches a preset charging cut-off voltage, charging is stopped.

[0009] Furthermore, before the charging process of the battery pack is interrupted, the steps include:

[0010] Dividing the battery pack into a plurality of charging stages using different charging currents;

[0011] According to the current charging stage at which the maximum cell voltage in the battery pack is located, charging the battery pack using a charging request current corresponding to the current charging stage;

[0012] When the current maximum single cell voltage of the battery pack is equal to the preset charging cut-off voltage, charging is stopped.

[0013] Furthermore, dividing the battery pack into a plurality of charging stages using different charging currents includes:

[0014] Taking a charging stage in which the maximum single cell voltage in the battery pack is less than or equal to a preset first cut-off voltage as a first cut-off stage, and charging the battery pack with a first charging request current corresponding to the first cut-off stage;

[0015] Taking a charging stage in which the maximum single cell voltage in the battery pack is greater than a preset first cut-off voltage and less than or equal to a preset second cut-off voltage as a second cut-off stage, and charging the battery pack using a second charging request current corresponding to the second cut-off stage;

[0016] The charging stage in which the maximum single cell voltage in the battery pack is greater than the preset second cut-off voltage and less than or equal to the preset third cut-off voltage is used as the third cut-off stage, and the battery pack is charged using a third charging request current corresponding to the third cut-off stage;

[0017] The charging stage in which the maximum single cell voltage in the battery pack is greater than the third cutoff voltage and less than the preset charging cutoff voltage is used as the fourth cutoff stage, and the battery pack is charged using the fourth charging request current corresponding to the fourth cutoff stage; wherein the first charging request current is greater than the second charging request current, the second charging request current is greater than the third charging request current, and the third charging request current is greater than the fourth charging request current.

[0018] Furthermore, when the battery pack is interrupted during the charging process, the initial stage range includes:

[0019] When it is detected that the state machine of the battery pack is not in the charging state, it is determined that the charging is interrupted and the initial stage range is used.

[0020] Furthermore, the initial stage range is the stage range after the staged charging cut-off stage is readjusted, including:

[0021] Adjusting the range of the first cut-off stage to be less than or equal to a preset first initial voltage and defining it as a first initial stage, corresponding to the first charging request current;

[0022] The range of the second cut-off stage is adjusted to be greater than the first initial voltage and less than or equal to the preset second initial voltage, which is defined as the second initial stage, corresponding to the second charging request current;

[0023] The range of the third cut-off stage is adjusted to be greater than the preset second initial voltage and less than or equal to the preset third initial voltage, which is defined as the third initial stage, corresponding to the third charging request current;

[0024] The range of the fourth cut-off stage is adjusted to be greater than the third initial voltage and less than the preset charging cut-off voltage, which is defined as the fourth initial stage, corresponding to the fourth charging request current.

[0025] Furthermore, the voltage value of each initial voltage is smaller than the voltage value of the cut-off voltage corresponding to the initial voltage.

[0026] Further, re-determining the maximum voltage of the current single battery in the battery pack after charging is resumed includes:

[0027] When the state machine of the battery pack returns to the charging state, it is determined that the charging is resumed, and the maximum voltage of the current single battery in the current battery pack is obtained.

[0028] Further, determining the current charging stage within the initial stage range after the battery pack is interrupted and restored according to the maximum voltage, and charging the battery pack using the current corresponding to the current charging stage includes:

[0029] When the maximum voltage of the single battery is within the range of the first initial stage, the first charging request current is used to charge the battery pack;

[0030] When the maximum voltage of the single battery is within the range of the second initial stage, the second charging request current is used to charge the battery pack;

[0031] When the maximum voltage of the single battery is within the range of the third initial stage, the battery pack is charged using the third charging request current;

[0032] When the maximum voltage of the single battery is within the range of the fourth initial stage, the battery pack is charged using the fourth charge request current.

[0033] The present invention also provides a charging terminal, which includes: a memory, a processor, and a charging program for resisting mains fluctuations stored in the memory and executable on the processor. When the charging program for resisting mains fluctuations is executed by the processor, the steps of the above-mentioned charging method for resisting mains fluctuations are implemented.

[0034] The present invention also provides a computer-readable storage medium, on which a charging program for resisting mains fluctuations is stored. When the charging program for resisting mains fluctuations is executed by a processor, the steps of the above-mentioned charging method for resisting mains fluctuations are implemented.

[0035] It is understandable that when the charging process is interrupted due to fluctuations in the mains power supply, the battery pack undergoes depolarization due to the charging interruption, causing the maximum voltage of the single cell in the battery pack to drop significantly. At this time, if the cut-off stage range used remains unchanged, the maximum voltage of the single cell in the battery pack falls from a certain cut-off stage to the previous cut-off stage, causing the corresponding charging current to also become the charging current of the previous cut-off stage, which is equivalent to using the charging current corresponding to the previous stage when the charging current corresponding to a certain stage should be used, resulting in insufficient or overcharged battery charge. In order to avoid the above problems, the present invention introduces an initial stage, and uses the initial stage after the interruption to determine the charging stage where the maximum voltage of the single cell in the battery pack is located. The range point of the initial stage range division will be smaller than the range point of the cut-off stage range division, so that even if the interruption causes the maximum voltage of the single cell in the battery pack to drop significantly, it will not fall into the range of the previous stage, ensuring that the battery is charged with the correct charging current. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of the charging terminal structure of the hardware operating environment involved in the embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of a flow chart of an embodiment of a charging method for resisting mains power fluctuation of the present invention;

[0038] Figure 3 It is a detailed schematic diagram of the process before step S10 in the charging method against mains fluctuation of the present invention;

[0039] Figure 4 It is a detailed flow chart of an optional embodiment constituted by steps S10, S20, S30 and S40 in the charging method against mains fluctuation of the present invention;

[0040] Figure 5 It is a schematic diagram of the relationship between the charging current and the maximum single cell voltage of the battery in the case where no charging interruption occurs in the charging method for resisting mains power fluctuation of the present invention;

[0041] Figure 6 It is a schematic diagram of the relationship between the charging current and the maximum single cell voltage of the battery in the case of charging interruption in the charging method for resisting mains power fluctuation of the present invention.

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making innovative work are within the scope of protection of the present invention.

[0044] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0045] like Figure 1 As shown, Figure 1 It is a schematic diagram of the charging terminal structure of the hardware operating environment involved in the embodiment of the present invention.

[0046] The terminal in the embodiment of the present invention may be a car or motorcycle that uses a battery as an energy source, or may be a terminal device with a rechargeable battery, such as a PC with a UPS, a smart phone, a tablet computer, a notebook computer, etc.

[0047] like Figure 1 As shown, the terminal may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0048] Those skilled in the art will understand that Figure 1 The terminal structure shown in the figure does not constitute a limitation on the terminal, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0049] like Figure 1 As shown, the memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and an anti-mains charging program.

[0050] exist Figure 1In the terminal shown, the network interface 1004 is mainly used to connect to the backend server and communicate data with the backend server; the user interface 1003 is mainly used to connect to the client (user end) and communicate data with the client; and the processor 1001 can be used to call the anti-mains charging program stored in the memory 1005 and perform the following operations:

[0051] When the battery pack is interrupted during the charging process, the initial stage range is used, and the initial stage range is the stage range after the staged charging cut-off stage is readjusted;

[0052] After charging is resumed, the maximum voltage of the current single battery in the battery pack is re-determined;

[0053] Determine, according to the maximum voltage, a current charging stage within the initial stage range after the battery pack is restored from interruption, and charge the battery pack using a current corresponding to the current charging stage;

[0054] When the voltage of any single battery in the battery pack reaches a preset charging cut-off voltage, charging is stopped.

[0055] Further, the processor 1001 may call the charging program for resisting mains fluctuation stored in the memory 1005, and further perform the following operations:

[0056] Before the battery pack is interrupted during the charging process, including:

[0057] Dividing the battery pack into a plurality of charging stages using different charging currents;

[0058] According to the current charging stage at which the maximum cell voltage in the battery pack is located, charging the battery pack using a charging request current corresponding to the current charging stage;

[0059] When the current maximum single cell voltage of the battery pack is equal to the preset charging cut-off voltage, charging is stopped.

[0060] Further, the processor 1001 may call the charging program for resisting mains fluctuation stored in the memory 1005, and further perform the following operations:

[0061] The step of dividing the battery pack into a plurality of charging stages using different charging currents comprises:

[0062] Taking a charging stage in which the maximum single cell voltage in the battery pack is less than or equal to a preset first cut-off voltage as a first cut-off stage, and charging the battery pack with a first charging request current corresponding to the first cut-off stage;

[0063] Taking a charging stage in which the maximum single cell voltage in the battery pack is greater than a preset first cut-off voltage and less than or equal to a preset second cut-off voltage as a second cut-off stage, and charging the battery pack using a second charging request current corresponding to the second cut-off stage;

[0064] The charging stage in which the maximum single cell voltage in the battery pack is greater than the preset second cut-off voltage and less than or equal to the preset third cut-off voltage is used as the third cut-off stage, and the battery pack is charged using a third charging request current corresponding to the third cut-off stage;

[0065] The charging stage in which the maximum single cell voltage in the battery pack is greater than the third cutoff voltage and less than the preset charging cutoff voltage is used as the fourth cutoff stage, and the battery pack is charged using the fourth charging request current corresponding to the fourth cutoff stage; wherein, the first charging request current value is greater than the second charging request current value, greater than the third charging request current value, greater than the fourth charging request current value.

[0066] Further, the processor 1001 may call the charging program for resisting mains fluctuation stored in the memory 1005, and further perform the following operations:

[0067] When the battery pack is interrupted during the charging process, the initial stage of use includes:

[0068] When it is detected that the charging power supply voltage of the battery pack is less than the preset minimum charging voltage, charging is interrupted;

[0069] At the same time, the charging stage of the battery pack voltage at the current moment is detected. When the charging stage is the second cut-off stage, the third cut-off stage or the fourth cut-off stage, the initial stage range is used.

[0070] Further, the processor 1001 may call the charging program for resisting mains fluctuation stored in the memory 1005, and further perform the following operations:

[0071] The initial stage range is the stage range after the staged charging cut-off stage is readjusted, including:

[0072] Adjusting the range of the first cut-off stage to be less than or equal to a preset first initial voltage and defining it as a first initial stage, corresponding to the first charging request current;

[0073] The range of the second cut-off stage is adjusted to be greater than the first initial voltage and less than or equal to the preset second initial voltage, which is defined as the second initial stage, corresponding to the second charging request current;

[0074] The range of the third cut-off stage is adjusted to be greater than the preset second initial voltage and less than or equal to the preset third initial voltage, which is defined as the third initial stage, corresponding to the third charging request current;

[0075] The range of the fourth cut-off stage is adjusted to be greater than the third initial voltage and less than the preset charging cut-off voltage, which is defined as the fourth initial stage, corresponding to the fourth charging request current.

[0076] Furthermore, the voltage value of each initial voltage is smaller than the voltage value of the cut-off voltage corresponding to the initial voltage.

[0077] Further, the processor 1001 may call the charging program for resisting mains fluctuation stored in the memory 1005, and further perform the following operations:

[0078] The re-determining the maximum voltage of the current single battery in the battery pack after the charging power is restored comprises:

[0079] When the state machine of the battery pack returns to the charging state, it is determined that the charging is resumed, and the maximum voltage of the current single battery in the current battery pack is obtained.

[0080] Further, the processor 1001 may call the charging program for resisting mains fluctuation stored in the memory 1005, and further perform the following operations:

[0081] The step of determining the current charging stage within the initial stage range after the battery pack is interrupted and restored according to the maximum voltage, and charging the battery pack using a current corresponding to the current charging stage comprises:

[0082] When the maximum voltage of the single battery is within the range of the first initial stage, the first charging request current is used to charge the battery pack;

[0083] When the maximum voltage of the single battery is within the range of the second initial stage, the second charging request current is used to charge the battery pack;

[0084] When the maximum voltage of the single battery is within the range of the third initial stage, the battery pack is charged using the third charging request current;

[0085] When the maximum voltage of the single battery is within the range of the fourth initial stage, the battery pack is charged using the fourth charge request current.

[0086] Reference Figure 2 The first embodiment of the present invention provides a charging method for resisting mains power fluctuations, the charging method for resisting mains power fluctuations comprising:

[0087] Step S10, when the battery pack is interrupted during the charging process, the initial stage range is used, and the initial stage range is the stage range after the staged charging cut-off stage is readjusted;

[0088] It can be understood that the batteries described in the implementation of this solution include lead-acid batteries, lithium batteries, nickel-hydrogen batteries and other batteries that undergo polarization.

[0089] When the grid voltage or other charging power source voltage is lower than the minimum charging voltage required by the battery pack (e.g., in this solution, the minimum charging voltage of the battery pack is 180V, and the minimum charging voltage is not limited here and is set according to the battery type or its own characteristics), or the battery pack charging is interrupted due to other factors such as manually disconnecting the charging gun. Since the battery pack will undergo battery polarization during the charging process (the phenomenon that the potential deviates from the equilibrium potential when current passes through the battery is called electrode polarization. Battery polarization exists in common batteries such as lead-acid batteries, lithium batteries, and nickel-metal hydride batteries. When the battery is polarized, the voltage across the battery pack will be higher than the actual voltage of the battery pack), if the charging is interrupted, the battery pack will depolarize again. At this time, the voltage across the battery pack drops rapidly, and the battery management system will use the initial stage range to reconfirm the charging request current to adapt to the battery charging current demand when the power is restored (the initial stage range in this solution will lower the specific value of the current reduction point relative to the previous stage range, such as the first initial voltage value of the current reduction point in the first initial stage is 4090mV, while the value of this point in the previous stage range is 4160mV. The current reduction point can be understood as using a smaller current to charge when the maximum single cell voltage of the battery reaches this point value).

[0090] Step S20, re-determining the maximum voltage of the current single battery in the battery pack after charging is resumed;

[0091] When the state machine of the battery pack returns to the charging state, the charging is determined to be resumed. At this time, due to the interruption recovery process, depolarization occurs, and the battery voltage in the battery pack drops rapidly, so it is necessary to re-determine the maximum voltage of the single battery in the battery pack at this time.

[0092] Step S30, determining the current charging stage within the initial stage range after the battery pack is interrupted and restored according to the maximum voltage, and charging the battery pack using a current corresponding to the current charging stage;

[0093] After determining the maximum voltage of the single cell, determine the charging stage of the battery pack at this time according to the stage in which the maximum voltage is within the initial stage range (the initial stage is divided into four stages), and use the charging current corresponding to the charging stage to charge the battery pack. (For example: when the power is restored after the power failure, the voltage of a single cell in the battery pack is 4130mV, which is greater than the voltage of any other single cell in the battery pack, and is within the range of the third initial stage, which is greater than 4115mV and less than or equal to 4140mV. At this time, use the charging current 10A corresponding to the third initial stage to charge the battery pack)

[0094] Step S40, stopping charging when the voltage of any single battery in the battery pack reaches a preset charging cut-off voltage;

[0095] After charging is resumed, charge the battery in steps. When the voltage of any single cell in the battery pack reaches the preset cut-off voltage, it means the battery is fully charged and charging stops (the cut-off voltage is determined by the battery's own characteristics. For example, when the voltage of any single cell in the battery pack reaches the cut-off voltage of 4180mV, the battery is fully charged and charging stops).

[0096] It is understandable that when the battery is charging, the voltage of the power grid or other charging power source fluctuates to below the minimum charging voltage required by the battery pack, or the battery pack charging is interrupted due to other factors such as artificial disconnection of the charging gun, the battery pack will experience rapid depolarization due to the interruption of charging, and the terminal voltage of the battery pack will drop rapidly. After falling back to the voltage range of the previous charging stage, the charging will resume due to charging recovery. At this time, since the terminal voltage of the battery pack is in the range of the previous charging stage, the charging request current will be the current of the previous charging stage, which will be greater than the actual request current required by the battery at this time, making the polarization phenomenon more serious. The battery measurement voltage instantly rises to the cut-off voltage, causing the battery management system to report overvoltage and charging to stop. At this time, it will cause problems such as insufficient charging capacity or overcharging. Therefore, this embodiment uses the initial charging stage range differently after an interruption occurs. The initial stage range will lower the specific value of the stage current reduction point relative to the previous stage range. That is, under the initial stage range, after the charging interruption is restored, even if the measured voltage of the battery pack drops rapidly, it will not fall back to the previous charging stage. The battery management system can still use the correct charging current to charge the battery pack through the initial stage range, avoiding insufficient charging capacity or overcharging, and ensuring that the battery pack is fully charged in a safe manner.

[0097] Further, see Figure 3 Before the charging is interrupted, the charging method against mains fluctuations further includes:

[0098] Step S01, dividing the battery pack into a plurality of charging stages using different charging currents;

[0099] When determining the current battery power during charging, it is often judged based on the measured voltage of the battery. However, due to the polarization phenomenon during battery charging, the current measured voltage of the battery is higher than the actual voltage, and the judged power will also be higher than the actual power. Therefore, the charging process is divided into multiple charging stages, and the charging current is gradually reduced to avoid using a large current to aggravate the polarization phenomenon of the battery, resulting in the situation of insufficient charging. For example, in this embodiment, the charging process is divided into four stages.

[0100] Step S02, charging the battery pack using a charging request current corresponding to the current charging stage according to the current charging stage at which the maximum single cell voltage in the battery pack is located;

[0101] The charging stage in which the maximum single cell voltage in the battery pack is less than or equal to the preset first cut-off voltage is taken as the first cut-off stage, and the first charging request current corresponding to the first cut-off stage is used to charge the battery pack; the charging stage in which the maximum single cell voltage in the battery pack is greater than the preset first cut-off voltage and less than or equal to the preset second cut-off voltage is taken as the second cut-off stage, and the second charging request current corresponding to the second cut-off stage is used to charge the battery pack; the charging stage in which the maximum single cell voltage in the battery pack is greater than the preset second cut-off voltage and less than or equal to the preset third cut-off voltage is taken as the third cut-off stage, and the third charging request current corresponding to the third cut-off stage is used to charge the battery pack; the charging stage in which the maximum single cell voltage in the battery pack is greater than the third cut-off voltage and less than the preset charging cut-off voltage is taken as the fourth cut-off stage, and the fourth charging request current corresponding to the fourth cut-off stage is used to charge the battery pack; wherein, the current value of the first charging request current is greater than the current value of the second charging request current, greater than the current value of the third charging request current, greater than the current value of the fourth charging request current.

[0102] The preset charging current reduction stage includes a second cut-off stage, a third cut-off stage and a fourth cut-off stage.

[0103] As reference Figure 5 To provide further details: the first cut-off stage range is greater than 0mV and less than or equal to 4160mV, and the charging current used is the first charging request current of 40A; the second cut-off stage range is greater than 4160mV and less than or equal to 4170mV, and the charging current used is the second charging request current of 20A; the third cut-off stage range is greater than 4170mV and less than or equal to 4175mV, and the charging current used is the third charging request current of 10A; the fourth cut-off stage range is greater than 4175mV and less than 4180mV, and the charging current used is the fourth charging request current of 5A. In the case of no charging interruption, the current voltage of the battery being charged is 4130mV, which is in the first cut-off stage, and the battery pack is charged with a current of 40A.

[0104] Step S03, stopping charging when the current voltage of the battery pack is equal to a preset charging cut-off voltage;

[0105] When the current voltage of the battery pack reaches the preset charging cut-off voltage, charging of the battery pack is stopped. For example, in the present embodiment, charging is stopped when the current voltage of the battery pack rises to 4180 mV.

[0106] It can be understood that in this embodiment, the entire charging process of the battery pack is divided into four stages, each stage corresponds to a different charging current, and the current used from the first stage to the last stage will gradually decrease to reduce the polarization degree of the battery during charging and reduce the impact of battery polarization on the charging process.

[0107] Further, see Figure 4 In another embodiment of the present invention, the charging method against mains fluctuations comprises:

[0108] Step S11, when it is detected that the state machine of the battery pack is not in the charging state, it is determined that the charging is interrupted and the initial stage range is used;

[0109] In this embodiment, when the voltage of the power grid or its charging power supply drops to 180V or the state machine in the battery pack management system exits the charging state due to factors such as artificial disconnection of the charging gun, it is determined to be a charging interruption, and the stage range currently used to determine the battery pack charging stage is changed to the initial stage. Compared with the existing charging method, this solution will distinguish between the situations where charging has been interrupted and the situations where charging has not been interrupted, and use different charging stage ranges to meet the needs of the two situations. (For example: before the charging is interrupted, the battery pack charging stage is in the second cut-off stage, at which time the voltage is 4165mV, and the charging is interrupted and the voltage drops to 4130mV. If the charging stage range is not changed, the battery pack charging stage will be in the first cut-off stage, and the charging current used will change, thus affecting the judgment of the charging current use).

[0110] The range of the initial stage is obtained by adjusting the cutoff stage. The range of the first cutoff stage is adjusted to be less than or equal to the preset first initial voltage and defined as the first initial stage, corresponding to the first charging request current; the range of the second cutoff stage is adjusted to be greater than the first initial voltage and less than or equal to the preset second initial voltage and defined as the second initial stage, corresponding to the second charging request current; the range of the third cutoff stage is adjusted to be greater than the preset second initial voltage and less than or equal to the preset third initial voltage and defined as the third initial stage, corresponding to the third charging request current; the range of the fourth cutoff stage is adjusted to be greater than the third initial voltage and less than the preset charging cutoff voltage and defined as the fourth initial stage, corresponding to the fourth charging request current. (As referenced Figure 6To be further described in detail: the first initial stage range is greater than 0mV and less than or equal to 4090mV, and the charging current used is the first charging request current 40A; the second initial stage range is greater than 4090mV and less than or equal to 4115mV, and the charging current used is the second charging request current 20A; the third initial stage range is greater than 4115mV and less than or equal to 4140mV, and the charging current used is the third charging request current 10A; the fourth initial stage range is greater than 4140mV and less than 4180mV, and the charging current used is the fourth charging request current 5A) The voltage value of each initial voltage is less than the voltage value of the cut-off voltage corresponding to the initial voltage, as can be seen from the above embodiments. In this embodiment, the range adjustment adjusts the first cut-off voltage 4160mV to the first initial voltage 4090mV. The reduction range varies according to the characteristics of the battery itself and can be obtained by test calibration, so no specific provisions are made here.

[0111] It can be understood that, compared with the existing charging method, this embodiment will distinguish between the situations where charging has been interrupted and the situations where charging has not been interrupted, and use different charging stage ranges respectively. The initial voltage of the charging stage current reduction point after the range adjustment will be lower than the corresponding charging stage current reduction point cut-off voltage before adjustment to adapt to the voltage reduction of the battery pack due to depolarization of the charging interruption. The specific voltage value of each initial voltage is obtained by test calibration, and the calibrated initial voltage value is different for the characteristics of different batteries.

[0112] Step S21, when the state machine of the battery pack returns to the charging state, determining that charging is resumed, and obtaining the maximum voltage of the current single battery in the current battery pack;

[0113] When the state machine in the battery pack management system enters the charging state again, charging is confirmed to be resumed. However, due to depolarization caused by power failure, the voltage of any single cell in the battery pack will decrease at this time, so it is necessary to re-determine the current maximum voltage of the single cell in the battery pack to determine its initial charging stage.

[0114] Step S30, determining the current charging stage within the initial stage range after the battery pack is interrupted and restored according to the maximum voltage, and charging the battery pack using a current corresponding to the current charging stage;

[0115] When the maximum voltage of the single cell is within the range of the first initial stage, the first charging request current is used to charge the battery pack; when the maximum voltage of the single cell is within the range of the second initial stage, the second charging request current is used to charge the battery pack; when the maximum voltage of the single cell is within the range of the third initial stage, the third charging request current is used to charge the battery pack; when the maximum voltage of the single cell is within the range of the fourth initial stage, the fourth charging request current is used to charge the battery pack. (For example: if the maximum voltage of the single cell in the current battery pack is 4130mV, it is in the third initial stage, greater than 4115mV and less than or equal to 4140mV, and the charging current used is the third charging request current 10A).

[0116] If the situations where charging has been interrupted and where charging has not been interrupted are not distinguished, for example, before the interruption, the maximum voltage of the single cell in the battery pack is 4173mV and is in the third cut-off stage, corresponding to the current of 10A; after the charging is interrupted, the maximum voltage of the single cell in the battery pack drops to 4130mV and is in the first cut-off stage within the cut-off stage range, and the charging current used is the first charging request current of 40A. At the current of 40A, the voltage of the battery pack will rise rapidly, which will cause insufficient charging capacity or overcharging of the battery. However, after the charging stage range is adjusted in this embodiment, the voltage drops to 4130mV after the charging is interrupted and is in the third cut-off stage within the initial stage range. The current of 10A is also applicable in the initial stage, thereby effectively avoiding the problem of insufficient charging capacity or overcharging.

[0117] It can be understood that in this embodiment, by distinguishing between the two situations of charging interruption and charging without interruption, two sets of different staged charging range division methods are used to ensure that when charging interruption occurs, the charging current will not be increased due to the drop in the measured voltage of the battery pack. The battery management system can charge the battery pack with the correct charging current, which ensures the safety of the battery pack and allows the battery pack to be fully charged.

[0118] The present invention also provides a charging terminal, which includes: a memory, a processor, and a charging program for resisting mains fluctuations stored in the memory and executable on the processor. When the charging program for resisting mains fluctuations is executed by the processor, the steps of the above-mentioned charging method for resisting mains fluctuations are implemented.

[0119] The present invention also provides a computer-readable storage medium, on which a charging program for resisting mains fluctuations is stored. When the charging program for resisting mains fluctuations is executed by a processor, the steps of the above-mentioned charging method for resisting mains fluctuations are implemented.

[0120] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system 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 system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0121] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0122] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions for enabling a terminal device (which can be a battery-powered car or motorcycle, a computer with UPS or a server with a rechargeable battery, etc.) to execute the methods described in each embodiment of the present invention.

[0123] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A charging method for resisting mains power fluctuation, characterized in that: The method comprises the following: When the battery pack is interrupted during the charging process, the initial stage range is used, and the initial stage range is the stage range after the staged charging cut-off stage is readjusted; When the state machine of the battery pack returns to the charging state, determining that charging is resumed, and re-determining the single cell maximum voltage of the current single cell in the battery pack after charging is resumed; Determine the current charging stage within the initial stage range after the battery pack is interrupted and restored according to the maximum voltage of the single battery, and charge the battery pack using a current corresponding to the current charging stage; When the voltage of any single battery in the battery pack reaches a preset charging cut-off voltage, charging is stopped.

2. The charging method against mains fluctuation as claimed in claim 1, characterized in that: Before the battery pack is interrupted during the charging process, including: Dividing the battery pack into a plurality of charging stages using different charging currents; According to the current charging stage at which the maximum cell voltage in the battery pack is located, charging the battery pack using a charging request current corresponding to the current charging stage; When the current maximum single cell voltage of the battery pack is equal to the preset charging cut-off voltage, charging is stopped.

3. The charging method against mains fluctuation as claimed in claim 2, characterized in that: The step of dividing the battery pack into a plurality of charging stages using different charging currents comprises: Taking a charging stage in which the maximum single cell voltage in the battery pack is less than or equal to a preset first cut-off voltage as a first cut-off stage, and charging the battery pack with a first charging request current corresponding to the first cut-off stage; Taking a charging stage in which the maximum single cell voltage in the battery pack is greater than a preset first cut-off voltage and less than or equal to a preset second cut-off voltage as a second cut-off stage, and charging the battery pack using a second charging request current corresponding to the second cut-off stage; The charging stage in which the maximum single cell voltage in the battery pack is greater than the preset second cut-off voltage and less than or equal to the preset third cut-off voltage is used as the third cut-off stage, and the battery pack is charged using a third charging request current corresponding to the third cut-off stage; The charging stage in which the maximum single cell voltage in the battery pack is greater than the third cutoff voltage and less than the preset charging cutoff voltage is used as the fourth cutoff stage, and the battery pack is charged using the fourth charging request current corresponding to the fourth cutoff stage; wherein the first charging request current is greater than the second charging request current, the second charging request current is greater than the third charging request current, and the third charging request current is greater than the fourth charging request current.

4. The charging method against mains fluctuation as claimed in claim 3, characterized in that: When the battery pack is interrupted during the charging process, the initial stage of use includes: When it is detected that the state machine of the battery pack is not in the charging state, it is determined that the charging is interrupted and the initial stage range is used.

5. The charging method against mains fluctuation as claimed in claim 3, characterized in that: The initial stage range is the stage range after the staged charging cut-off stage is readjusted, including: Adjusting the range of the first cut-off stage to be less than or equal to a preset first initial voltage and defining it as a first initial stage, corresponding to the first charging request current; The range of the second cut-off stage is adjusted to be greater than the first initial voltage and less than or equal to the preset second initial voltage, which is defined as the second initial stage, corresponding to the second charging request current; The range of the third cut-off stage is adjusted to be greater than the preset second initial voltage and less than or equal to the preset third initial voltage, which is defined as the third initial stage, corresponding to the third charging request current; The range of the fourth cut-off stage is adjusted to be greater than the third initial voltage and less than the preset charging cut-off voltage, which is defined as the fourth initial stage, corresponding to the fourth charging request current.

6. The charging method against mains fluctuation as claimed in claim 5, characterized in that: A voltage value of each of the initial voltages is smaller than a voltage value of a cut-off voltage corresponding to the initial voltage.

7. The charging method against mains fluctuation as claimed in claim 5, characterized in that: The step of determining the current charging stage within the initial stage range after the battery pack is interrupted and restored according to the maximum voltage of the single battery, and charging the battery pack using the current corresponding to the current charging stage comprises: When the maximum voltage of the single battery is within the range of the first initial stage, the first charging request current is used to charge the battery pack; When the maximum voltage of the single battery is within the range of the second initial stage, the second charging request current is used to charge the battery pack; When the maximum voltage of the single battery is within the range of the third initial stage, the battery pack is charged using the third charging request current; When the maximum voltage of the single battery is within the range of the fourth initial stage, the battery pack is charged using the fourth charge request current.

8. A charging terminal, characterized in that: The charging terminal includes: a memory, a processor, and a charging program for resisting mains fluctuations stored in the memory and executable on the processor. When the charging program for resisting mains fluctuations is executed by the processor, the steps of the charging method for resisting mains fluctuations as described in any one of claims 1 to 7 are implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a charging program for resisting mains fluctuations. When the charging program for resisting mains fluctuations is executed by a processor, the steps of the charging method for resisting mains fluctuations as claimed in any one of claims 1 to 7 are implemented.

Images