Charging balancing method and device, electronic equipment and medium

Abstract

The application provides a charging balancing method and device, electronic equipment and medium, including starting a balancing module, determining a first charging strategy from a plurality of charging strategies according to a current charging current, and based on the number of consecutive charging periods in the first charging strategy, processing charging of the battery pack by cyclically executing the number of consecutive charging periods for each battery pack, stopping charging for a predetermined number of periods, and closing the balancing module until the battery pack is fully charged. The scheme can improve the effect of charging balancing.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, and particularly relates to a charging balancing method and device, electronic equipment and medium. BACKGROUND

[0002] Battery pack is widely used in various industries as a kind of green energy. The battery pack includes multiple battery cells, and there is a performance difference between the battery cells. This also causes a voltage difference between the battery cells during the charging process of the battery pack, which affects the service life and efficiency of the battery pack.

[0003] In the related art, when the battery cell reaches a predetermined voltage, a balancing module is started to balance the voltage difference. The charger continuously supplies power to the battery pack, and the balancing module is closed when the battery pack is fully charged. However, in the related art, when the battery pack is fully charged, the voltage difference between the battery cells is still large, and the balancing effect is poor, which cannot achieve effective charging balancing. SUMMARY

[0004] The present application provides a charging balancing method, device, electronic equipment and medium to solve the technical problem that the current charging scheme cannot achieve effective charging balancing.

[0005] In a first aspect, the present application provides a charging balancing method, including: starting a balancing module, the balancing module being used to reduce the voltage difference between battery cells in a battery pack; obtaining a current charging current, and determining a first charging strategy from a plurality of charging strategies according to the current charging current; wherein the charging strategy includes a number of continuous charging cycles, and the number of continuous charging cycles is different in different charging strategies; based on the number of continuous charging cycles in the first charging strategy, charging the battery pack by cyclically executing the following processing until the battery pack is fully charged, and then closing the balancing module; wherein the processing includes: stopping charging for a predetermined period after continuously charging the battery pack for the number of cycles.

[0006] Optionally, the determining of the first charging strategy from the plurality of charging strategies according to the current charging current includes: determining a first current interval to which the current charging current belongs from a plurality of current intervals; wherein the plurality of current intervals correspond to the plurality of charging strategies one by one, and the plurality of current intervals are obtained by dividing the section between zero and the standard constant current charging current of the battery pack; and taking the charging strategy corresponding to the first current interval as the current charging strategy.

[0007] Optionally, the number of continuous charging cycles in the charging strategy corresponding to each current interval is positively correlated with the size of the charging current corresponding to each current interval.

[0008] Optionally, in ascending order according to the corresponding charging current, each current interval is sequentially set with a number in an incremental manner, the number being a positive integer; based on the number of each current interval, the number of continuous charging periods in the corresponding charging strategy of each current interval is determined; wherein the number of continuous charging periods in the charging strategy is the result obtained by subtracting one from twice the number of the corresponding current interval.

[0009] Optionally, the length of a single period is the length of a main cycle of the battery management system of the battery pack.

[0010] Optionally, the starting balancing module comprises: after receiving the identification of entering the constant voltage charging phase issued by the charger, if it is detected that the voltages of the current cells meet the predetermined balancing condition, the balancing module is started.

[0011] Optionally, after the starting balancing module, it further comprises: if it is detected that the predetermined constant current charging condition is met, the indication of switching to the constant current charging phase is not sent to the charger until it is detected that the charger is removed.

[0012] In a second aspect, the application provides a charging balancing device, comprising: a starting module for starting a balancing module, the balancing module being used to reduce the voltage difference between cells in a battery pack; an acquisition module for acquiring a current charging current and determining a first charging strategy from a plurality of charging strategies according to the current charging current; wherein the charging strategy comprises the number of continuous charging periods, and the number of continuous charging periods in different charging strategies is different; a processing module for charging the battery pack by cyclically executing the following processing based on the number of continuous charging periods in the first charging strategy until the battery pack is fully charged and the balancing module is closed; wherein the processing comprises: after continuously charging the battery pack for the number of periods, stopping charging for a predetermined period.

[0013] Optionally, the acquisition module is specifically configured to determine a first current interval to which the current charging current belongs from a plurality of current intervals; wherein the plurality of current intervals correspond one-to-one to the plurality of charging strategies, and the plurality of current intervals are obtained by dividing the section between zero and the standard constant current charging current of the battery pack; the acquisition module is specifically further configured to take the charging strategy corresponding to the first current interval as the current charging strategy.

[0014] Optionally, the number of continuous charging periods in the charging strategy corresponding to each current interval is positively correlated with the size of the charging current corresponding to each current interval.

[0015] Optionally, the obtaining module is further configured to sequentially set a number for each current interval in an incremental manner in the order from small to large according to the corresponding charging current, and the number is a positive integer; and the obtaining module is further configured to determine the number of continuous charging periods in the corresponding charging strategy of each current interval based on the number of each current interval; wherein the number of continuous charging periods in the charging strategy is a result obtained by subtracting one from twice the number of the corresponding current interval.

[0016] Optionally, the length of the single period is a length of a main cycle of a battery management system of the battery pack.

[0017] Optionally, the starting balancing module comprises: after receiving the identification of entering the constant-voltage charging phase issued by the charger, if it is detected that the voltages of the current battery cells satisfy the predetermined balancing condition, the starting balancing module is started.

[0018] Optionally, the processing module is further configured to, after the starting balancing module, if it is detected that the predetermined constant-current charging condition is satisfied, not sending an instruction to switch to the constant-current charging phase to the charger until it is detected that the charger is removed.

[0019] In a third aspect, the present application provides an electronic device, comprising: a processor, and a memory connected with the processor in communication; the memory stores computer execution instructions; and the processor executes the computer execution instructions stored in the memory to implement the method as described above.

[0020] In a fourth aspect, the present application provides a computer readable storage medium, wherein the computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by a processor to implement the method as described above.

[0021] In the charging balancing method, the device, the electronic device and the medium provided by the present application, the starting balancing module is started, and a first charging strategy is determined from a plurality of charging strategies according to the current charging current, and the battery pack is charged by cyclically executing the continuous charging period number of the battery pack and then stopping charging for a predetermined period, until the battery pack is fully charged and the balancing module is closed. The present application prolongs the charging time of the battery pack and the balancing time of the balancing module by the charging mode of stopping charging for a predetermined period after cyclically executing the continuous charging period number, and fully executes the charging balancing operation, thereby effectively improving the balancing effect. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with embodiments of the present application and, together with the specification, serve to explain principles of embodiments of the present application.

[0023] The above figures have shown the specific embodiments of the present application, which will be described in more detail hereinafter. These figures and the written description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments.

[0024] Figure 1 A flowchart of a charging balancing method provided for the first embodiment of the present application;

[0025] Figure 2 A flowchart of a charging balancing method provided for the first embodiment of the present application;

[0026] Figure 3 A flowchart of a charging balancing method provided for the first embodiment of the present application;

[0027] Figure 4 A structural diagram of a charging balancing device provided for the second embodiment of the present application;

[0028] Figure 5 A structural diagram of an electronic device provided for the seventh embodiment of the present application.

[0029] The above figures have shown the specific embodiments of the present application, which will be described in more detail hereinafter. These figures and the written description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made with reference to the accompanying drawings in which like reference numerals refer to like elements, and the term "exemplary" is used herein to mean "serving as an example, instance, or illustration." The following description is not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application as described in the appended claims.

[0031] Battery packs are widely used in various industries as a green energy source. A battery pack includes a plurality of battery cells, and there are performance differences between the battery cells. These differences also cause voltage differences between the battery cells during charging of the battery pack, which affects the service life and efficiency of the battery pack.

[0032] The charging process of the battery pack includes a constant current charging phase and a constant voltage charging phase. The battery pack is initially charged at a constant charging current. The constant current is generally set according to the design capacity of the battery pack. When there is a cell with a voltage higher than 4.2V in the battery pack, the constant voltage charging phase is entered. During the constant voltage charging phase, the charging voltage remains constant, and the charging voltage of the battery pack gradually increases, and the charging current gradually decreases until it is zero.

[0033] In the related art, when the cell reaches a predetermined voltage, the balancing module is started, and the voltage of the cell with a higher voltage is consumed through the balancing resistor in the balancing module to balance the voltage difference. However, the charging current is generally large, and the balancing current is relatively small. In particular, in the scenario where the voltage difference is large, the battery pack is fully charged, and the voltage difference between the cells is still large, so the balancing effect of the method in the related art is poor.

[0034] The technical solutions of the present application and the technical solutions of the present application will be described in detail below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. In the description of the present application, unless otherwise explicitly specified and limited, each term should be understood in a broad sense within the art. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0035] Embodiment one

[0036] Figure 1 The flowchart of the charging balancing method provided by Embodiment One of the present application. The execution subject of this method can be a charging balancing device, or an electronic device integrated with a charging balancing device. The following will be described by taking an electronic device integrated with a charging balancing device as an example. As shown in Figure 1 The charging balancing method provided by the present embodiment includes:

[0037] S101: Start the balancing module, and the balancing module is used to reduce the voltage difference between each cell in the battery pack;

[0038] S102: Obtain the current charging current, and determine a first charging strategy from a plurality of charging strategies according to the current charging current;

[0039] S103: Based on the number of consecutive charging periods in the first charging strategy, charge the battery pack by repeatedly executing the following processing until the battery pack is fully charged, and then turn off the balancing module.

[0040] The balancing module is used to reduce the voltage difference between each battery cell in the battery pack. The balancing module can include a balancing circuit, and a balancing resistor is arranged on the balancing circuit. When the balancing module is turned on, the balancing resistor is used to discharge the battery cell with a higher voltage. The discharge current is the balancing current. Since heat is generated during the discharging process, the balancing current is relatively small, and is generally set to 30mA-1A.

[0041] In actual applications, the starting of the balancing module can be controlled by a battery management system (BMS) of the battery pack. The BMS can be integrated in the electronic device. When the BMS detects that the condition for starting the balancing module is met, the balancing module is turned on. It should be noted that the balancing module works in parallel with the charger after being turned on. That is, the starting of the balancing module does not affect the charging of the battery pack by the charger.

[0042] For the starting condition of the balancing module, in one example, S101 includes:

[0043] After receiving the identification of entering the constant voltage charging phase sent by the charger, if it is detected that the voltage of each battery cell meets the predetermined balancing condition, the balancing module is started.

[0044] In actual applications, when the BMS obtains that the voltage of the single battery cell in the battery pack exceeds the predetermined first voltage, the first voltage can be set to 4.2V. Then, the indication of entering the constant voltage charging phase is sent to the charger. After the charger enters the constant voltage charging phase, the charger feeds back the identification of entering the constant voltage charging phase to the BMS. After the BMS receives the identification, and detects that the voltage of each battery cell meets the predetermined balancing condition, the balancing module is started.

[0045] For example, the predetermined balancing condition includes that the voltage difference between each battery cell exceeds 30mV. That is, when the identification of entering the constant voltage charging phase sent by the charger is received, and it is detected that the voltage difference between the battery cells exceeds 30mV, the balancing module is started.

[0046] In the related art, the balancing module is usually started when the voltage of the single battery cell in the battery pack exceeds 4.1V. When the voltage of the single battery cell is 4.1V, the charger is usually in the constant current charging phase, the charging current in the constant current charging phase is large, so that the charging rate of the battery cell is large, and the detected voltage value can have a large error, so that the battery cell to be balanced cannot be accurately determined, and thus the balancing module is easily caused to perform invalid balancing. In addition, under the constant current charging phase, the charging current is large, and the balancing current is relatively small, so that the balancing effect of the balancing module is not obvious. That is, under the condition in the related art, the balancing module is started, which cannot enhance the balancing effect of the balancing module, and also reduces the charging efficiency of the battery pack.

[0047] In the example, the charger enters the constant voltage charging stage, and if the predetermined balancing condition is met, the balancing module is started. The charging current in the constant voltage charging stage is small, and the measured voltage value is relatively accurate. Compared with the prior art, the invalid balancing caused by the detection error of the voltage can be reduced, and the charging efficiency of the battery pack can be relatively improved.

[0048] After the charging module is started, S102 is executed, the current charging current is obtained, and a first charging strategy is determined from a plurality of charging strategies according to the current charging current. The charging strategy includes the number of continuous charging cycles, and the number of continuous charging cycles in different charging strategies is different.

[0049] In the scheme, the number of cycles can represent the length of time that the charger works continuously. As an example, the length of a single cycle is the length of time that the battery management system of the battery pack takes for one main cycle. The main cycle is the time that the BMS takes for one data communication, that is, the time that the BMS takes to obtain the charging current each time. The main cycle time is generally 250 ms. It can be understood that the example takes the length of the main cycle as the length of a single cycle, so that when the current charging current is obtained, the charger is at the end of a cycle, and the charger can be conveniently switched to other charging strategies.

[0050] For the determination of the first charging strategy, Figure 2 The flowchart of another charging and balancing method provided by Embodiment One of the application is shown in FIG. 2. Figure 2 As shown in FIG. 2, S102 includes:

[0051] S201: From a plurality of current intervals, a first current interval to which the current charging current belongs is determined.

[0052] S202: The charging strategy corresponding to the first current interval is taken as the current charging strategy.

[0053] The plurality of current intervals correspond to the plurality of charging strategies one by one, and the plurality of current intervals are obtained by dividing the section between zero and the standard constant current charging current of the battery pack. In actual application, the constant current charging current is generally set according to the design capacity of the battery pack. Generally, the constant current charging current can be set to 0.5 times the design capacity (A.h unit) of the battery pack.

[0054] In the example, 0-constant current charging voltage is divided into a plurality of intervals. Each interval corresponds to a charging strategy. From a plurality of current intervals, a first current interval to which the current charging current belongs is determined, and the charging strategy corresponding to the first current interval is the first charging strategy, and the battery pack is charged by executing the first charging strategy. It can be understood that after entering the constant voltage charging stage, the current gradually decreases, which will correspond to different current intervals and different charging strategies.

[0055] In actual application, the charging strategy can be pre-stored in the electronic device, the first charging strategy is acquired according to the current charging current, and charging is performed according to the first charging strategy.

[0056] The following will be exemplarily introduced: the constant current charging current is set as 0.5 times of the design capacity of the battery pack. The design capacity of the battery pack is 10 Ah, and the constant current charging current is 5 A. Correspondingly, the current of 0-5 A is divided into 5 intervals, which are 0-1 A, 1 A-2 A, 2 A-3 A, 3 A-4 A, and 4 A-5 A. The current acquired is 0.8 A, 0-1 A is determined as the first current interval, and the charging strategy corresponding to 0-1 A is taken as the first charging strategy.

[0057] Through the example, the first charging strategy corresponding to the current charging current can be determined, and the battery pack can be charged by executing the first charging strategy, thereby improving the balancing effect of the battery.

[0058] On the basis of the above example, in some examples, the number of continuous charging periods in the charging strategy corresponding to each current interval is positively correlated with the size of the charging current corresponding to each current interval.

[0059] In the example, the greater the charging current corresponding to each current interval, the greater the number of continuous charging periods in the corresponding charging strategy. It can be understood that when the charger enters constant voltage charging, the charging current gradually decreases, and the number of continuous charging periods is less.

[0060] That is, the smaller the charging current, the more frequent the number of times of stopping charging. In the example, the period of stopping charging is mainly concentrated in the period of small current, and the period of large charging current is mainly used for charging, and the period of small current is mainly used for balancing, so that the problem of low charging efficiency caused by stopping charging can be reduced.

[0061] In one example, each current interval is sequentially set with a number in an increasing manner in the order of the corresponding charging current from small to large, and the number is a positive integer;

[0062] Based on the number of each current interval, the number of continuous charging periods in the charging strategy corresponding to each current interval is determined; wherein the number of continuous charging periods in the charging strategy is the result obtained by subtracting one from twice the number of the corresponding current interval.

[0063] In the example, the current interval is set with a number, and the number of periods of the charging strategy corresponding to the current interval is the result obtained by subtracting one from twice the number.

[0064] For example, the design capacity of a battery pack is 10 Ah, and the corresponding constant current charging current is 5 A. 0-5 A is divided into 5 intervals, i.e. 0-1 A, 1 A-2 A, 2 A-3 A, 3 A-4 A, and 4 A-5 A, corresponding to the numbers 1-5 in turn. The current charging current is obtained as 1.5 A, and the corresponding current interval is 1 A-2 A. The number corresponding to this interval is 2, and the number of continuous charging cycles of the charging strategy corresponding to the 1 A-2 A current interval is 2x2-1=3. Therefore, the number of continuous charging cycles in the first charging strategy is 3 times.

[0065] According to the current charging current, the number of continuous charging cycles in the corresponding charging strategy can be obtained, and the charging mode of the charger can be controlled based on the number of continuous charging cycles, so as to improve the balancing effect of the balancing module.

[0066] After determining the first charging strategy, S103 is executed, i.e. based on the number of continuous charging cycles in the first charging strategy, the strategy of stopping charging for a predetermined number of cycles is executed in a loop until the battery pack is fully charged, and the balancing module is turned off. The value of the predetermined number of cycles can be determined according to actual conditions. For example, the predetermined number of cycles can be one. In actual application, the charging current changes, and different charging strategies are correspondingly selected during the change. That is, the charger is controlled to change the corresponding charging strategy according to the size of the current charging current.

[0067] In this embodiment, after the number of continuous charging cycles, the charger is stopped for a predetermined number of cycles, which prolongs the charging time of the battery pack and further prolongs the balancing period of the balancing module, so as to further discharge the high-voltage battery cell and reduce the balancing voltage between the battery cells, thereby improving the balancing effect.

[0068] For example, in the first charging strategy, the number of continuous charging cycles is 5, and the predetermined number of cycles is 1. The charger executes the charging strategy of stopping charging for one cycle in a loop for 5 continuous charging cycles, until it is detected that the current charging current changes the corresponding charging strategy, and the changed charging strategy is executed accordingly.

[0069] It should be noted that in some charging scenarios where the maximum voltage difference is relatively small, the battery pack has not been fully charged, and the balancing module has balanced the maximum voltage difference to within the allowable voltage difference, which can be set to 10 mV. In this scenario, the balancing module can also be turned off to prevent over-balance of the battery cell voltage.

[0070] On the basis of the above example, after the balancing module is started, it further includes,

[0071] If it is detected that the predetermined constant current charging condition is met, the charger is not instructed to switch to the constant current charging stage until it is detected that the charger is removed.

[0072] In actual applications, when it is detected that the current satisfies the constant voltage charging condition, taking the voltage of the single battery cell existing in the battery pack exceeding 4.2v as an example, the charger enters the constant voltage charging phase, and after the balancing module is started, the voltage of the single battery cell with high voltage is consumed, so that the voltage of the battery cell in the battery pack can be less than 4.2v.

[0073] In related technologies, when the voltage of the battery cell in the battery pack is less than 4.2v, an indication of entering the constant current phase is sent to the charger. However, in the example, after the balancing module is started, if it is detected that the current scene satisfies the condition of entering the constant current charging, for example, it is detected that the voltage of the battery cell in the current battery pack is less than 4.2v, no indication of switching to the constant current charging phase is sent to the charger, that is, in the example, the constant voltage charging state will be maintained after the balancing module is started, unless the charger is removed. In this way, the reduction of the balancing time caused by the large current in the constant current charging phase can be avoided, and therefore the balancing effect can be further improved.

[0074] The embodiment will be described below in combination with an actual application scene. Figure 3 As shown in a flowchart of a method of another charging and balancing method provided by Embodiment One of the application, Figure 3 As shown in the figure, the designed capacity of the charging battery pack is C, and the charging current in the constant current charging phase is 0.5C. After the charger enters the constant voltage charging phase and the balancing module is started, it is detected that the current charging current is 0.45C, which corresponds to the 5th current interval 0.4C-0.5C. The number of continuous charging cycles in the charging strategy of the 5th current interval is 2x5-1=9, and therefore the charger is controlled to cyclically perform continuous charging for 9 cycles and stop charging for one cycle. The duration of one cycle is 250ms. When it is detected that the current charging current is 0.32C, the corresponding charging interval is the 4th current interval, and therefore the charger is controlled to cyclically perform continuous charging for 7 cycles and stop charging for one cycle. Similarly, when it is detected that the current charging current is 0.22C, the corresponding charging interval is the 3rd current interval, and therefore the charger is controlled to cyclically perform continuous charging for 5 cycles and stop charging for one cycle. When it is detected that the current charging current is 0.05C, the corresponding charging interval is the 1st current interval, and therefore the charger is controlled to cyclically perform continuous charging for 1 cycle and stop charging for one cycle.

[0075] The charging balancing method provided in the application comprises the following steps: starting a balancing module, determining a first charging strategy from a plurality of charging strategies according to a current charging current, and charging a battery pack through a loop execution of the following process: stopping charging for a predetermined period after a continuous charging period number in the first charging strategy, until the battery pack is fully charged and the balancing module is closed. The charging mode of stopping charging for a predetermined period after a continuous charging period number is executed in a loop, thereby prolonging the charging time of the battery pack and the balancing time of the balancing module, fully executing the charging balancing operation, and effectively improving the balancing effect.

[0076] Embodiment Two

[0077] Figure 4 A structural schematic diagram of a charging balancing device provided in Embodiment Two of the application is shown in FIG. 1. The charging balancing device provided in the embodiment comprises: Figure 4

[0078] The starting module 41 is configured to start the balancing module, and the balancing module is configured to reduce the voltage difference between each cell in the battery pack.

[0079] The acquisition module 42 is configured to acquire a current charging current, and determine a first charging strategy from a plurality of charging strategies according to the current charging current.

[0080] The processing module 43 is configured to charge the battery pack through a loop execution of the following process based on a continuous charging period number in the first charging strategy, until the battery pack is fully charged and the balancing module is closed.

[0081] The balancing module is configured to reduce the voltage difference between each cell in the battery pack, and the balancing module can comprise a balancing circuit, and a balancing resistor is arranged on the balancing circuit. After the balancing module is started, the balancing resistor is used to discharge the cell with a higher voltage, and the discharge current is a balancing current. Since heat is generated during the discharging process, the balancing current is set to be relatively small, and the balancing current is generally set to be 30 mA to 1 A.

[0082] In actual application, the starting of the balancing module can be controlled by a battery management system (BMS) of the battery pack, and the BMS can be integrated in an electronic device. When the BMS detects that the condition for starting the balancing module is met, the balancing module is started. It is worth noting that the balancing module works in parallel with the charger after being started. That is, the starting of the balancing module will not affect the charging of the battery pack by the charger.

[0083] In one example, the starting module 41 is specifically configured to start the balancing module after receiving the identification of entering the constant-voltage charging phase from the charger and detecting that the voltage of each cell meets the predetermined balancing condition.​

[0084] In actual application, when the BMS obtains that the voltage of the single battery cell in the battery pack exceeds the predetermined first pressure, the first voltage can be set as 4.2V, and an instruction of entering the constant voltage charging stage is sent to the charger. After the charger enters the constant voltage charging stage, the charger feeds back an identification of entering the constant voltage charging stage to the BMS. After the BMS receives the identification and detects that the voltage of each battery cell at present satisfies the predetermined balancing condition, the balancing module is started.

[0085] In related art, the balancing module is usually started when the voltage of the single battery cell in the battery pack exceeds 4.1V. When the voltage of the single battery cell is 4.1V, the charger is usually in the constant current charging stage, the charging current in the constant current charging stage is large, so that the charging rate of the battery cell is large, and the detected voltage value can have a large error, so that the battery cell to be balanced cannot be accurately determined, and thus the balancing module can easily perform invalid balancing. In addition, in the constant current charging stage, the charging current is large and the balancing current is relatively small, so that the balancing effect of the balancing module is not obvious, that is, the balancing module is started under the condition in related art, and the balancing effect of the balancing module cannot be enhanced, and the charging efficiency of the battery pack is also reduced.

[0086] In the present example, the balancing module is started when the charger enters the constant voltage charging stage and satisfies the predetermined balancing condition. The charging current in the constant voltage charging stage is small, and the detected voltage value is relatively accurate. Compared with the prior art, invalid balancing caused by the detection error of the voltage can be reduced, and the charging efficiency of the battery pack can be relatively improved.

[0087] The starting module 41 starts the charging module, and the obtaining module 42 obtains the current charging current, and determines a first charging strategy from a plurality of charging strategies according to the current charging current. The charging strategy includes the number of continuous charging periods, and the number of continuous charging periods is different in different charging strategies.

[0088] In the present example, the number of periods can represent the length of time during which the charger continuously works, and as an example, the length of time of a single period is the length of time of a main cycle of the battery management system of the battery pack. The main cycle is the time for the BMS to perform data communication once, that is, the time for the BMS to obtain the charging current each time. The main cycle time is generally 250ms. It can be understood that, in the present example, the length of time of the main cycle is taken as the length of time of a single period, so that when the current charging current is obtained, the charger is at the end of a period, and thus the charger can be conveniently switched to enter other charging strategies.

[0089] In one example, continuing to refer to Figure 4 The obtaining module 42 is specifically configured to determine a first current interval to which the current charging current belongs from a plurality of current intervals.

[0090] The acquisition module 42 is further configured to obtain the charging strategy corresponding to the first current interval as a current charging strategy.

[0091] The plurality of current intervals correspond to the plurality of charging strategies one by one, and the plurality of current intervals are obtained by dividing sections between zero and a standard constant current charging current of the battery pack. In actual application, the constant current charging current is generally set according to the designed capacity of the battery pack. Generally, the constant current charging current can be set to 0.5 times the designed capacity (A.h unit) of the battery pack.

[0092] In this example, the acquisition module 42 divides 0-constant current charging voltage into a plurality of intervals. Each interval corresponds to a charging strategy. From the plurality of current intervals, the first current interval to which the current charging current belongs is determined, and the charging strategy corresponding to the first current interval is the first charging strategy, and the first charging strategy is executed to charge the battery pack. It can be understood that after entering the constant voltage charging phase, the current gradually decreases, which will correspond to different current intervals and then correspond to different charging strategies.

[0093] In actual application, the charging strategy can be pre-stored in the electronic device, the first charging strategy is obtained according to the current charging current, and charging is performed according to the first charging strategy.

[0094] Through this example, the first charging strategy corresponding to the current charging current can be determined, and the battery pack can be charged by executing the first charging strategy, thereby improving the balancing effect of the battery.

[0095] On the basis of the above example, in some examples, the number of continuous charging periods in the charging strategy corresponding to each current interval is positively correlated with the size of the charging current corresponding to each current interval.

[0096] In this example, the larger the charging current corresponding to each current interval, the larger the number of continuous charging periods in the corresponding charging strategy. It can be understood that when the charger enters the constant voltage charging, the charging current gradually decreases, and the number of continuous charging periods corresponding to the charging current is less.

[0097] That is, the smaller the charging current, the more frequent the number of times of stopping charging. In this example, the period of stopping charging is mainly concentrated in the period of small current, and the period of large charging current is mainly used for charging, and the period of small current is mainly used for balancing. Therefore, this example can reduce the problem of low charging efficiency caused by stopping charging.

[0098] In one example, the acquisition module 42 is further configured to sequentially set a number for each current interval in an increasing manner in the order of corresponding charging current from small to large, and the number is a positive integer.

[0099] The acquisition module 42 is further configured to determine, based on the number of each current interval, the number of continuous charging periods in the charging strategy corresponding to each current interval; wherein the number of continuous charging periods in the charging strategy is obtained by subtracting 1 from twice the number of the corresponding current interval.

[0100] In this example, the current interval is numbered, and the number of periods in the charging strategy corresponding to the current interval is obtained by subtracting 1 from twice the number. Through this scheme, the number of continuous charging periods in the corresponding charging strategy can be obtained according to the current charging current, and the charging mode of the charger can be controlled based on the number of continuous charging periods to improve the balancing effect of the balancing module.

[0101] After determining the first charging strategy, the strategy of charging for a number of continuous charging periods and then stopping charging for a predetermined number of periods is executed in a loop based on the number of continuous charging periods in the first charging strategy until the battery pack is fully charged and the balancing module is turned off. The predetermined number of periods can be determined according to actual conditions, for example, the predetermined period can be one. In actual application, the charging current varies, and different charging strategies are correspondingly selected during the variation. That is, the charger is controlled to switch to the corresponding charging strategy according to the size of the current charging current.

[0102] In this embodiment, the charging is stopped for a predetermined number of periods after a number of continuous charging periods, which prolongs the charging time of the battery pack and further prolongs the balancing period of the balancing module, so as to further discharge the high-voltage cells and reduce the balancing voltage between the cells, thereby improving the balancing effect.

[0103] Based on the above example, the processing module 43 is further configured to, after starting the balancing module, if it is detected that the predetermined constant current charging condition is met, not send an instruction to the charger to switch to the constant current charging stage until it is detected that the charger is removed.

[0104] In actual application, when it is detected that the constant voltage charging condition is met, for example, the voltage of a single cell in the battery pack exceeds 4.2v, the charger enters the constant voltage charging stage. After the balancing module is started, the voltage of the single cell with high voltage is consumed, which may cause the voltage of the cell in the battery pack to be less than 4.2v.

[0105] In the related art, when the voltage of the battery cell in the battery pack is less than 4.2V, an indication of entering the constant current stage is sent to the charger. However, in the present example, after the starting module 41 starts the balancing module, if it is detected that the current scenario meets the condition of entering the constant current charging, for example, it is detected that the voltage of the battery cell in the current battery pack is less than 4.2V, an indication of switching to the constant current charging stage is not sent to the charger, that is, in the present example, after the balancing module is started, the constant voltage charging state will be maintained at all times, unless the charger is removed. This can avoid the reduction of the balancing time caused by the large current in the constant current charging stage, and therefore the present solution can further improve the balancing effect.

[0106] In the charging balancing device provided in the present application, the starting module starts the balancing module, the acquisition module determines a first charging strategy from a plurality of charging strategies according to the current charging current, and the processing module processes the charging of the battery pack by executing the charging for a continuous charging period number of times and then stopping the charging for a predetermined period of time based on the continuous charging period number in the first charging strategy, until the battery pack is fully charged and the balancing module is turned off. The present solution prolongs the balancing time of the balancing module by executing the charging for a continuous charging period number of times and then stopping the charging for a predetermined period of time, and fully performs the charging balancing operation, thereby effectively improving the balancing effect.

[0107] Embodiment Three

[0108] Figure 5 The structural schematic diagram of the electronic device provided in Embodiment Three of the present application is shown in FIG. 3, which includes: Figure 5

[0109] The processor 291, the electronic device further includes a memory 292; and can further include a communication interface 293 and a bus 294. The processor 291, the memory 292, the communication interface 293 can communicate with each other through the bus 294. The communication interface 293 can be used for information transmission. The processor 291 can call the logical instructions in the memory 292 to execute the method of the above-mentioned embodiments.

[0110] In addition, the logical instructions in the memory 292 described above can be implemented in the form of a software functional unit and sold or used as an independent product, which can be stored in a computer readable storage medium.

[0111] ​The memory 292, as a computer readable storage medium, can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiments of the present application. The processor 291 performs function application and data processing, that is, implements the method in the method embodiments described above, by running the software programs, instructions and modules stored in the memory 292.

[0112] The memory 292 can include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required by a function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 292 can include a high-speed random access memory, and can also include a non-volatile memory.

[0113] The embodiments of the present application further provide a computer readable storage medium, wherein the computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by a processor to implement the method in any of the embodiments.

[0114] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are exemplary only and the true scope and spirit of the application is indicated by the claims. The application is to be limited only by the claims sufficiently supported by this specification.

[0115] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is to be limited only by the appended claims.

Claims

1. A charging balancing method, characterized in that, include: After receiving the signal from the charger indicating that it has entered the constant voltage charging stage, if it is detected that the voltage of each cell meets the predetermined balance condition, the balancing module is activated. The balancing module is used to reduce the voltage difference between the cells in the battery pack. The current charging current is obtained, and a first charging strategy is determined from multiple charging strategies based on the current charging current; wherein, the charging strategy includes the number of continuous charging cycles, and the number of continuous charging cycles is different in different charging strategies; the multiple charging strategies correspond one-to-one with multiple current intervals, and the multiple current intervals are obtained by dividing the segment between zero and the standard constant current charging current of the battery pack; the number of continuous charging cycles in the charging strategy is positively correlated with the magnitude of the charging current corresponding to each current interval; Based on the number of consecutive charging cycles in the first charging strategy, the battery pack is charged by repeatedly performing the following process until the battery pack is fully charged, at which point the balancing module is turned off; wherein, the process includes: stopping charging for a predetermined number of cycles after each consecutive charging cycle of the battery pack.

2. The method according to claim 1, characterized in that, The step of determining a first charging strategy from multiple charging strategies based on the current charging current includes: From multiple current ranges, determine the first current range to which the current charging current belongs; The charging strategy corresponding to the first current range is used as the first charging strategy.

3. The method according to claim 1, characterized in that, The method further includes: According to the corresponding charging current in ascending order, each current range is assigned a number in an increasing manner, and the number is a positive integer; Based on the number of each current range, the number of consecutive charging cycles in the charging strategy corresponding to each current range is determined; wherein, the number of consecutive charging cycles in the charging strategy is the result obtained by subtracting one from twice the number of the corresponding current range.

4. The method according to claim 1, characterized in that, The duration of a single cycle is the duration of one main cycle of the battery pack's battery management system.

5. The method according to claim 1, characterized in that, After the balancing module is activated, the system also includes: If the predetermined constant current charging conditions are detected to be met, no instruction to switch to the constant current charging stage is sent to the charger until the charger is detected to be removed.

6. A charging balancing device, characterized in that, include: The startup module is used to receive the identifier from the charger indicating that the constant voltage charging stage has been entered. If it is detected that the voltage of each cell meets the predetermined balance condition, the balance module is started. The balance module is used to reduce the voltage difference between the cells in the battery pack. An acquisition module is used to acquire the current charging current and determine a first charging strategy from multiple charging strategies based on the current charging current; wherein, the charging strategy includes the number of continuous charging cycles, and the number of continuous charging cycles is different in different charging strategies; the multiple charging strategies correspond one-to-one with multiple current intervals, and the multiple current intervals are obtained by dividing the segment between zero and the standard constant current charging current of the battery pack; the number of continuous charging cycles in the charging strategy is positively correlated with the magnitude of the charging current corresponding to each current interval; The processing module is configured to charge the battery pack by repeatedly performing the following process based on the number of consecutive charging cycles in the first charging strategy, until the battery pack is fully charged, and then shut down the balancing module; wherein the process includes: stopping charging for a predetermined number of cycles after each consecutive charging cycle of the battery pack.

7. The apparatus according to claim 6, characterized in that, The acquisition module is specifically used to determine the first current range to which the current charging current belongs from multiple current ranges; The acquisition module is further configured to use the charging strategy corresponding to the first current range as the current charging strategy.

8. The apparatus according to claim 6, characterized in that, The acquisition module is further configured to assign a number to each current range in ascending order of the corresponding charging current, wherein the number is a positive integer. The acquisition module is further configured to determine the number of consecutive charging cycles in the charging strategy corresponding to each current interval based on the number of each current interval; wherein the number of consecutive charging cycles in the charging strategy is the result obtained by subtracting one from twice the number of the corresponding current interval.

9. The apparatus according to claim 6, characterized in that, The duration of a single cycle is the duration of one main cycle of the battery pack's battery management system.

10. The apparatus according to claim 6, characterized in that, The processing module is further configured to, after the start-up balancing module, if it detects that the predetermined constant current charging conditions are met, not send an instruction to the charger to switch to the constant current charging stage until the charger is detected to be removed.

11. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1-5.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-5.

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