Charging control circuit, method, device and battery system using the same

Abstract

The present disclosure relates to a charging control circuit, method, device, and battery system using the same. The present disclosure provides a main charging circuit and at least one set of secondary charging circuits in the charging control circuit. For battery cells with a cell voltage less than a first voltage threshold, the corresponding main switch unit is controlled to be turned on and the secondary switch unit is controlled to be turned off, allowing the battery cell to be connected to the main charging circuit and rapidly charged with a larger charging current. For battery cells with a cell voltage not less than the first voltage threshold, the corresponding main switch unit is controlled to be turned off and the secondary switch unit is controlled to be turned on, disconnecting the battery cell from the main charging circuit and connecting it to the secondary charging circuit instead. The battery cell continues to charge with a smaller charging current, resulting in a reduced charging speed. In this way, by independently controlling each battery cell in the controlled battery pack, the battery cell with a higher cell voltage is charged with a smaller charging current, reducing the difference in charge between different battery cells and achieving charge balancing.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a charging control circuit, method, device, and a battery system using the same. Background Art

[0002] In large-capacity battery applications, such as electric vehicles, multiple cells are typically connected in series, parallel, or both to create a battery pack with the voltage and capacity required to meet the application's requirements. During use, the voltage or capacity of the individual cells in the pack can vary, and these variations increase with age. Consequently, during the battery pack's charge and discharge process, the lowest-capacity cell will limit the overall charge and discharge of the pack, reducing its overall capacity.

[0003] Related technologies often use active or passive balancing to balance the charge of battery packs, minimizing differences in charge between individual cells. Active balancing uses energy storage devices like capacitors and inductors, resulting in slow balancing. Passive balancing, on the other hand, consumes the charge of high-capacity individual cells, resulting in energy waste.

[0004] In view of this, it is necessary to provide an efficient and energy-saving battery power balancing solution. Summary of the Invention

[0005] The purpose of the embodiments of the present disclosure is to provide a charging control circuit, method, device and a battery system using the same, so as to improve the power balancing efficiency of a battery pack and reduce energy waste.

[0006] In a first aspect, an embodiment of the present disclosure provides a charging control circuit, comprising: a charging control unit, a primary charging circuit, and at least one set of secondary charging circuits;

[0007] The main charging circuit includes a main switch unit corresponding to each battery cell in the controlled battery pack; the secondary charging circuit includes a secondary switch unit corresponding to each battery cell in the controlled battery pack; the charging current of the main charging circuit is greater than the charging current of the secondary charging circuit;

[0008] The charging control unit is connected to the primary charging circuit and the secondary charging circuit respectively;

[0009] The charging control unit is used to obtain the cell voltage of each battery cell in the controlled battery pack and compare it with the first voltage threshold respectively; for a first battery cell whose cell voltage is less than the first voltage threshold, the main switch unit corresponding to the first battery cell is controlled to be turned on and the secondary switch unit is controlled to be turned off, so that the first battery cell is connected to the main charging circuit for charging; for a second battery cell whose cell voltage is not less than the first voltage threshold, the secondary switch unit corresponding to the second battery cell is controlled to be turned on and the main switch unit is controlled to be turned off, so that the second battery cell is connected to the secondary charging circuit for charging.

[0010] In an optional embodiment, the main switch unit includes:

[0011] a first controllable switch connected in series with the positive electrode of the corresponding battery cell, a second controllable switch connected in series with the negative electrode of the corresponding battery cell, and a third controllable switch connected in parallel with the series circuit formed by the first controllable switch, the corresponding battery cell, and the second controllable switch;

[0012] When the first controllable switch and the second controllable switch are both closed and the third controllable switch is open, the corresponding battery unit is connected to the main charging circuit; when the first controllable switch and the second controllable switch are both open and the third controllable switch is closed, the corresponding battery unit is disconnected from the main charging circuit.

[0013] In an optional embodiment, the secondary charging circuit includes a trickle charging circuit;

[0014] The secondary switch unit in the trickle charging circuit includes a trickle switch unit;

[0015] The trickle switch unit comprises:

[0016] a first transistor connected in series with the positive electrode of the corresponding battery cell, a second transistor connected in series with the negative electrode of the corresponding battery cell, and a second variable resistor and a third transistor connected in parallel with the series circuit formed by the first transistor, the corresponding battery cell, and the second transistor;

[0017] When the first transistor and the second transistor are both turned on and the third transistor is turned off, the corresponding battery cell is connected to the trickle charging circuit; when the first transistor and the second transistor are both turned off and the third transistor is turned on, the corresponding battery cell is disconnected from the trickle charging circuit.

[0018] In an optional embodiment, the secondary charging circuit further includes a micro-current charging circuit; the charging current of the micro-current charging circuit is smaller than the charging current of the trickle charging circuit;

[0019] The secondary switch unit in the micro-current charging circuit includes a micro-current switch unit;

[0020] The micro-current switch unit includes:

[0021] a fourth controllable switch connected in series with the positive electrode of the corresponding battery cell, and a fifth controllable switch connected in series with the negative electrode of the corresponding battery cell;

[0022] When the fourth controllable switch and the fifth controllable switch are both closed, the corresponding battery unit is connected to the micro-current charging circuit; when the fourth controllable switch and the fifth controllable switch are both opened, the corresponding battery unit is disconnected from the micro-current charging circuit.

[0023] In an optional embodiment, the charging control unit is configured to, for a second battery cell whose cell voltage is not less than the first voltage threshold,

[0024] When the cell voltage of the second battery cell is less than a second voltage threshold, controlling the trickle switch unit corresponding to the second battery cell to be turned on, and the main switch unit and the micro-current switch unit to be turned off, so that the second battery cell is connected to the trickle charging circuit for charging;

[0025] When the cell voltage of the second battery cell is not less than a second voltage threshold, the micro-current switch unit corresponding to the second battery cell is controlled to be turned on, and the main switch unit and the trickle switch unit are both turned off, so that the second battery cell is connected to the micro-current charging circuit for charging;

[0026] The first voltage threshold is smaller than the second voltage threshold.

[0027] In an optional embodiment, the main charging circuit further includes a safety circuit for adjusting the main charging current under the control of the charging control unit;

[0028] The safety circuit includes a third variable resistor and a fourth transistor connected in series.

[0029] In a second aspect, an embodiment of the present disclosure provides a charging control method, which is applied to a charging control circuit;

[0030] The charging control circuit includes a main charging circuit and at least one set of secondary charging circuits; the main charging circuit includes a main switch unit corresponding to each battery cell in the controlled battery pack; the secondary charging circuit includes a secondary switch unit corresponding to each battery cell in the controlled battery pack; the main charging current of the main charging circuit is greater than the secondary charging current of the secondary charging circuit;

[0031] The method comprises:

[0032] Obtaining the cell voltage of each battery cell in the controlled battery pack, and comparing the cell voltage with the first voltage threshold respectively;

[0033] For a first battery cell whose cell voltage is lower than the first voltage threshold, controlling the main switch unit corresponding to the first battery cell in the charging control circuit to be turned on and the secondary switch unit to be turned off, so that the first battery cell is connected to the main charging circuit of the charging control circuit for charging;

[0034] For a second battery cell whose cell voltage is not less than the first voltage threshold, the secondary switch unit corresponding to the second battery cell in the charging control circuit is controlled to be turned on and the main switch unit is controlled to be turned off, so that the second battery cell is connected to the secondary charging circuit of the charging control circuit for charging.

[0035] In an optional embodiment, the secondary charging circuit in the charging control circuit includes two groups, namely a trickle charging circuit and a micro-current charging circuit;

[0036] For the second battery cell whose cell voltage is not less than the first voltage threshold, controlling the secondary switch unit corresponding to the second battery cell in the charging control circuit to be turned on and the main switch unit to be turned off includes:

[0037] For a third battery cell whose cell voltage is not less than the first voltage threshold but less than the second voltage threshold, controlling the trickle switch unit corresponding to the third battery cell in the charging control circuit to be turned on, and the main switch unit and the micro-current switch unit to be turned off, so that the third battery cell is connected to the trickle charging circuit for trickle charging;

[0038] For the fourth battery cell whose cell voltage is not less than the second voltage threshold, the microcurrent switch unit corresponding to the fourth battery cell in the charging control circuit is controlled to be turned on, and the main switch unit and the trickle switch unit are both disconnected, so that the fourth battery cell is connected to the microcurrent charging circuit for microcurrent charging.

[0039] In a third aspect, an embodiment of the present disclosure provides a charging control device, which is applied to a charging control circuit;

[0040] The charging control circuit includes a main charging circuit and at least one set of secondary charging circuits; the main charging circuit includes a main switch unit corresponding to each battery cell in the controlled battery pack; the secondary charging circuit includes a secondary switch unit corresponding to each battery cell in the controlled battery pack; the main charging current of the main charging circuit is greater than the secondary charging current of the secondary charging circuit;

[0041] The charging control device includes:

[0042] A voltage detection module, configured to obtain the cell voltage of each battery cell in the controlled battery pack and compare the cell voltage with a first voltage threshold value respectively;

[0043] a first control module, configured to control, for a first battery cell whose cell voltage is lower than the first voltage threshold, a main switch unit corresponding to the first battery cell in the charging control circuit to be turned on and a secondary switch unit to be turned off, so that the first battery cell is connected to a main charging circuit of the charging control circuit for charging;

[0044] The second control module is used to control the secondary switch unit corresponding to the second battery cell in the charging control circuit to be turned on and the main switch unit to be turned off for the second battery cell whose cell voltage is not less than the first voltage threshold, so that the second battery cell is connected to the secondary charging circuit of the charging control circuit for charging.

[0045] In an optional embodiment, the charging control circuit may include two sets of secondary charging circuits, namely a trickle charging circuit and a micro-current charging circuit; the second control module in the above-mentioned charging control device may specifically include:

[0046] a third submodule, configured to control, for a third battery cell whose cell voltage is not less than the first voltage threshold but less than the second voltage threshold, the trickle switch unit corresponding to the third battery cell in the charging control circuit to be turned on, and the main switch unit and the micro-current switch unit to be turned off, so that the third battery cell is connected to the trickle charging circuit for trickle charging;

[0047] The fourth submodule is used to control the micro-current switch unit corresponding to the fourth battery cell in the charging control circuit to be turned on, and the main switch unit and the trickle switch unit to be turned off, for the fourth battery cell whose cell voltage is not less than the second voltage threshold, so that the fourth battery cell is connected to the micro-current charging circuit for micro-current charging.

[0048] In a fourth aspect, an embodiment of the present disclosure provides a battery system, comprising: a battery pack, and a charging control circuit as described in the first aspect.

[0049] In a fifth aspect, an embodiment of the present disclosure provides a computer-readable storage medium having a computer program stored thereon, characterized in that when the program is executed by a processor, the method described in the second aspect above is implemented.

[0050] In a sixth aspect, an embodiment of the present disclosure provides an electronic device, including:

[0051] a memory having a computer program stored thereon;

[0052] A processor is used to execute the computer program in the memory to implement the method as described in the second aspect above.

[0053] As can be seen from the above embodiments, first, the presently disclosed embodiments provide at least two charging circuits within the charging control circuit, namely, a primary charging circuit and at least one secondary charging circuit. The charging circuit to which each battery cell is connected is switched based on the cell voltage of each battery cell in the controlled battery pack. When the cell voltage of a battery cell is less than a first voltage threshold, the corresponding primary switch unit is controlled to be on and the secondary switch unit is controlled to be off, connecting the battery cell to the primary charging circuit and rapidly charging with a higher charging current. When the cell voltage of a battery cell is not less than the first voltage threshold, the corresponding primary switch unit is controlled to be off and the secondary switch unit is controlled to be on, disconnecting the battery cell from the primary charging circuit and connecting it to the secondary charging circuit, where it continues charging with a lower charging current, resulting in a slower charging speed. In this way, by independently controlling each battery cell in the controlled battery pack, battery cells with lower cell voltages are charged with a higher charging current, while battery cells with higher cell voltages are charged with a lower charging current, thereby gradually reducing the voltage difference between the different battery cells, and thus gradually reducing the difference in charge between the different battery cells, thereby achieving charge balancing. During this battery balancing process, there is no need to consume the power of battery cells with higher voltages, thus avoiding energy waste. Energy storage devices such as inductors and capacitors are also not required. Instead, battery balancing is achieved by reducing the charging current of high-voltage battery cells. The control logic is simple and easy to implement, which can improve the battery balancing effect and balancing speed.

[0054] Secondly, in the embodiment of the present disclosure, two groups of secondary charging circuits can be set in the charging control circuit, namely a trickle charging circuit and a micro-current charging circuit. When the cell voltage of the battery cell is not less than the first voltage threshold but less than the second voltage threshold, the trickle switch unit corresponding to the battery cell is controlled to be turned on, so that it is connected to the trickle charging circuit and charged by the trickle current; when the cell voltage of the battery cell is not less than the second voltage threshold, the micro-current switch unit corresponding to the battery cell is controlled to be turned on, so that it is connected to the micro-current charging circuit and charged by the micro-current until it is fully charged. In the embodiment of the present disclosure, battery cells with different cell voltages can be in different charging states and charged with charging currents of different sizes, so that the charging speed of different battery cells can be controlled, and then the power difference between different battery cells can be coordinated and controlled to achieve power balance.

[0055] Again, in the embodiment of the present disclosure, a variable resistor is provided in the trickle switch unit. By adjusting the resistance value of the variable resistor, the size of the corresponding trickle charging current can be adjusted, thereby achieving precise control of the trickle charging current.

[0056] In addition, in the embodiment of the present disclosure, a safety circuit is also connected in series in the main charging circuit. By controlling the resistance value of the safety circuit, the load of the entire main charging circuit can be adjusted, thereby adjusting the current of the main charging circuit so that it is always within a safe range, thereby avoiding damage to the battery cells of the battery units connected to the main charging circuit due to excessive current. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 A schematic diagram of a charging control circuit provided by an embodiment of the present disclosure is shown;

[0058] Figure 2 A circuit diagram of a main switch unit in a charging control circuit according to an embodiment of the present disclosure is shown;

[0059] Figure 3 A circuit diagram of a secondary switch unit in a charging control circuit according to an embodiment of the present disclosure is shown;

[0060] Figure 4 A circuit diagram showing another secondary switch unit in the charging control circuit according to an embodiment of the present disclosure is shown;

[0061] Figure 5 A schematic diagram of another charging control circuit provided by an embodiment of the present disclosure is shown;

[0062] Figure 6 A flow chart of a charging control method provided by an embodiment of the present disclosure is shown;

[0063] Figure 7 A schematic structural diagram of an electronic device provided by an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0064] The present application will be further described in detail below through the accompanying drawings and examples, through which the features and advantages of the present application will become more clear and distinct.

[0065] The word "exemplary" is used exclusively herein to mean "serving as an example, example, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0066] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0067] A charging control circuit, method, device and battery system using the same provided by the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings through specific embodiments.

[0068] Figure 1 FIG. 1 is a schematic diagram of a charging control circuit provided by an embodiment of the present disclosure. The charging control circuit can be used to control the charging of any controlled battery pack. Figure 1 As shown, the controlled battery pack 100 may include a plurality of battery cells P1, P2, ..., Pn; in different application scenarios, each battery cell may include one or more single batteries.

[0069] See also Figure 1 The charging control circuit 200 may include: a charging control unit 210, a main charging circuit 220 and a secondary charging circuit 230. The main charging circuit 220 includes the battery cells P1 to P2 in the controlled battery pack 100. n One-to-one corresponding main switch unit K 11 ~K 1n The secondary charging circuit 230 includes each battery cell P1~P in the controlled battery pack 100 n One-to-one corresponding secondary switch unit K 21 ~K 2n The charging current I1 of the main charging circuit 220 is greater than the charging current I2 of the secondary charging circuit 230.

[0070] The charging control unit 210 is connected to the main charging circuit 220 and the secondary charging circuit 230 respectively, and is used to charge the battery cells P1 to P2 according to the charging current. n The unit voltage V1~V n A corresponding control signal is generated and sent to the corresponding main switch unit or secondary switch unit to control its switch state, so that the corresponding battery unit is connected to the main charging circuit 220 or the secondary charging circuit 230 and charged by the charging current I1 or I2.

[0071] Specifically, in order to achieve power balance between each battery unit, the control logic of the charging control unit 210 on each switch unit is as follows: respectively obtain the power of each battery unit P1 to P n The unit voltage V1~V n , and respectively with the first voltage threshold V set1 For the cell voltage being less than the first voltage threshold V set1 The first battery cell is controlled to be turned on by the main switch unit corresponding to the first battery cell and turned off by the secondary switch unit, so that the first battery cell is connected to the main charging circuit for charging; when the cell voltage is not less than the first voltage threshold V set1 The second battery unit is connected to the secondary charging circuit, and the secondary switch unit corresponding to the second battery unit is controlled to be turned on and the main switch unit is turned off, so that the second battery unit is connected to the secondary charging circuit for charging.

[0072] That is, in this embodiment, the charging control unit controls the switching states of the main switch unit and the secondary switch unit corresponding to each battery unit. i (i is the serial number of the battery cell, ranging from 1 to n), in which the cell voltage V i Smaller, that is, V i <V set1 When the main charging circuit is used to charge it, the larger charging current I1 is used to charge it, so that it can store electricity quickly and improve the charging efficiency. i Reaching the first voltage threshold V set1 After that, V i ≥V set1 , then use the smaller charging current I2 in the secondary charging circuit to charge it, thereby reducing the battery cell P i Since other battery cells with lower voltages are not affected at this time and are still charged by the larger charging current I1 in the main charging circuit, different charging currents can gradually reduce the voltage difference between the corresponding battery cells, that is, gradually reduce the power difference between the battery cells, and achieve power balance.

[0073] As can be seen from the above structure, the charging control circuit provided in the embodiment of the present disclosure controls the switching states of the main switch unit and the secondary switch unit corresponding to the battery cells in the controlled battery pack according to the cell voltage of each battery cell, so that when the cell voltage of the battery cell is less than the first voltage threshold, the battery cell is connected to the main charging circuit and quickly charged with a larger charging current. When the cell voltage of the battery cell is not less than the first voltage threshold, the battery cell is disconnected from the main charging circuit and connected to the secondary charging circuit, and continues to be charged with a smaller charging current, thereby reducing the charging speed. Other battery cells whose cell voltage is still less than the first voltage threshold are not affected and can continue to be quickly charged with a larger charging current in the main charging circuit. In this way, the battery cells with lower cell voltages in the controlled battery pack are charged with a larger charging current, while the battery cells with higher cell voltages are charged with a smaller charging current, thereby gradually reducing the voltage difference between different battery cells, and thus gradually reducing the difference in charge value between different battery cells, thereby achieving the purpose of charge balancing. During this battery balancing process, there is no need to consume the power of battery cells with higher voltages, thus avoiding energy waste. Energy storage devices such as inductors and capacitors are also not required. Instead, battery balancing is achieved by reducing the charging current of high-voltage battery cells. The control logic is simple and easy to implement, which can improve the battery balancing effect and balancing speed.

[0074] Optionally, in the embodiment of the present disclosure, the charging control unit 210 may include a voltage acquisition module corresponding to each battery cell, for acquiring the voltage of each battery cell P1 to P nVoltage unit V1~V n The voltage acquisition module can be implemented in many ways, for example, it can be implemented by a voltmeter, such as Figure 1 As shown, directly measure the corresponding battery cell P i The cell voltage V i (i=1,2,......,n); It can also be realized by a voltage divider circuit, and the cell voltage V of the corresponding battery cell Pi is calculated according to Ohm's law i ; In actual application scenarios, the specific form of the voltage acquisition module can be determined according to specific application requirements, and the embodiments of the present disclosure do not limit this.

[0075] In an optional embodiment of the present disclosure, the battery cells in the main charging circuit 220 may be connected in series; accordingly, Figure 2 As shown, for any battery cell P i , its corresponding main switch unit K 1i Specifically, they may include:

[0076] A first controllable switch K connected in series with the positive electrode of the corresponding battery cell Pi 1i_a , a second controllable switch K connected in series with the negative electrode of the corresponding battery cell 1i_b , and, with the first controllable switch K 1i_a , battery unit Pi and second controllable switch K 1i_b The series circuit formed by the third controllable switch K in parallel 1i_c .

[0077] The main switch unit K of the above structure is charged by the charging control unit 210. 1i Control to achieve battery cell P i Connect to or disconnect from the main charging circuit, the control logic is as follows: i The cell voltage V i Less than the first voltage threshold V set1 In the case of 1i Send a control signal to control the first controllable switch K 1i_a and the second controllable switch K 1i_b are all closed, and the third controllable switch K 1i_c If disconnected, the battery unit P i It can be connected in series to the main charging circuit; in the battery unit P i The cell voltage V i Not less than the first voltage threshold V set1 In the case of 1i Send a control signal to control the first controllable switch K 1i_aand the second controllable switch K 1i_b are both disconnected, and the third controllable switch K 1i_c Closed, the battery cell P i By the third controllable switch K 1i_c short circuit, so that the battery cell P i That is, disconnect from the main charging circuit.

[0078] It should be noted that the above-mentioned first controllable switch, second controllable switch, third controllable switch, etc. can specifically adopt any form of electronic switch such as thyristor, transistor, field effect transistor, thyristor, relay, etc. This embodiment does not limit the specific implementation form of the above-mentioned controllable switch.

[0079] In the disclosed embodiment, the structure and control logic of the main switch unit are simple and easy to implement, which can save costs and ensure control effects.

[0080] like Figure 1 As shown, different battery cells can be connected in parallel to the secondary charging circuit 230, and there are also many specific implementations of the corresponding secondary switch units. As an example, Figure 3 and Figure 4 Specific implementations of two secondary switch units are shown respectively and will be described below.

[0081] In an optional embodiment of the present disclosure, Figure 3 As shown, for any battery cell P i , its corresponding secondary switch unit K 2i-1 Specifically, they may include:

[0082] The corresponding battery cell P i The positive electrode of the first transistor Q is connected in series i_1 , and the corresponding battery cell P i The negative electrode of the second transistor Q is connected in series i_2 , and, with the first transistor Q i_1 , the corresponding battery cell P i and the second transistor Q i_2 The series circuit formed in parallel with the second variable resistor R i_2 and the third transistor Q i_3 .

[0083] In this embodiment, the charging control unit 210 controls the secondary switch unit K of the above structure. 2i-1 The specific control method is as follows: In the battery unit P i The cell voltage V i Not less than the first voltage threshold V set1 In the case of iWhen the secondary charging circuit is connected, the charging control unit 210 switches the secondary switch unit K 2i-1 Send control signal to control the first transistor Q i_1 and the second transistor Q i_2 are all turned on, and the third transistor Q i_3 Shutdown, the battery cell P i That is, it is connected to the secondary charging circuit and passes a smaller charging current I i_2 To charge; and when the battery cell P i When disconnected from the secondary charging circuit, the charging control unit 210 can send a signal to the secondary switch unit K 2i-1 Send control signal to control the first transistor Q i_1 and the second transistor Q i_2 are all turned off, and the third transistor Q i_3 Conducting, battery cell P i Disconnect from the secondary charging circuit.

[0084] Optional, such as Figure 3 As shown, the above-mentioned secondary switch unit K 2i-1 In the first transistor Q i_1 , battery cell P i and the second transistor Q i_2 The series circuit formed by the second variable resistor R i_2 and the third transistor Q i_3 The series circuits formed are connected in parallel with each other, and a first variable resistor R can also be connected in series in the main circuit of the parallel circuit. i_1 .

[0085] In passing Figure 3 The secondary switch unit K shown 2i-1 The secondary charging circuit is connected to the battery cell P i When charging, the charging current is I i_2 , flows through the second variable resistor R i_2 The current is I i_3 Since the total current of the parallel circuit is indeed equal to the sum of the currents in each branch, the current flowing through the first variable resistor R i_1 The current I i_1 =I i_2 +I i_3 .

[0086] In view of this, in the embodiment of the present disclosure, the charging control unit 210 controls the secondary switch unit K 2i-1 The control method can also be: when the battery unit P i When connected to the secondary charging circuit, the first transistor Q is controlled i_1 , the second transistor Q i_2 and the third transistor Q i_3are both in the on state, and by adjusting the first variable resistor R i_1 The resistance value is used to realize the parallel current I i_1 And the two branch currents I i_2 , I i_3 The coarse adjustment is then performed by adjusting the second variable resistor R i_2 resistance value, to achieve the charging current I i_2 of fine tuning.

[0087] It can be seen that the embodiment of the present disclosure is based on Figure 3 The secondary switch unit of the structure shown can not only connect each battery cell to the secondary charging circuit or disconnect it from the secondary charging circuit separately, but also adjust the charging current of each battery cell connected to the secondary charging circuit separately, thereby achieving precise control of the charging current, thereby precisely controlling the charging speed of the battery cell, reducing the difference in charge between different battery cells, and improving the charge balancing effect.

[0088] In other possible implementations, Figure 3 The secondary switch unit K shown 2i-1 , other control methods can also be used according to actual application requirements, for example: when the battery unit P i When the secondary charging circuit is connected, the charging control unit 210 controls the first transistor Q i_1 , the second transistor Q i_2 and the third transistor Q i_3 All are turned on; when the battery cell P i When disconnected from the secondary charging circuit, the charging control unit 210 controls the first transistor Q i_1 , the second transistor Q i_2 and the third transistor Q i_3 In addition, you can also Figure 3 Other forms of secondary switch units can be obtained by modifying the structure shown, for example, by omitting the second variable resistor R i_2 or the third transistor Q i_3 Any modified switch unit structure obtained without creative effort is within the protection scope of the present disclosure.

[0089] According to the actual application scenario, the first transistor Q i_1 , the second transistor Q i_1 and the third transistor Q i_3 Specifically, an insulated-gate bipolar transistor (IGBT) or a field-effect transistor may be used, but this embodiment does not limit this.

[0090] In an optional embodiment of the present disclosure, Figure 4As shown, for any battery cell P i , its corresponding secondary switch unit K 2i-2 Specifically, they may include:

[0091] The corresponding battery cell P i The positive electrode of the fourth controllable switch K is connected in series i_c , and, with the corresponding battery cell P i The negative electrode of the fifth controllable switch K is connected in series i_d .

[0092] In this embodiment, the charging control unit 210 Figure 4 The secondary switch unit K of the structure shown 2i-2 The specific control method is as follows: In the battery unit P i The cell voltage V i Not less than the first voltage threshold V set1 In the case of i When the secondary charging circuit is connected, the charging control unit 210 switches the secondary switch unit K 2i-2 Send a control signal to control the fourth controllable switch and the fifth controllable switch to be closed, and the battery unit P i That is, it is connected to the secondary charging circuit and passes a smaller charging current I i_4 To charge; and when the battery cell P i When disconnected from the secondary charging circuit, the charging control unit 210 can send a signal to the secondary switch unit K 2i-2 Send a control signal to control the fourth controllable switch and the fifth controllable switch to be closed and opened, and the battery unit P i It can be disconnected from the secondary charging circuit.

[0093] In the charging control circuit provided by the embodiment of the present disclosure, the secondary charging circuit may include one or more groups of: Figure 1 Only one set of secondary charging circuits 230 is shown. In actual application scenarios, the number of secondary charging circuits and the specific form of the secondary switch units therein can be configured according to specific application requirements. For example, in one possible implementation, the charging control circuit is configured with only one set of secondary charging circuits, and the secondary charging circuit adopts a trickle charging circuit, and the corresponding secondary switch units adopt the following configuration: Figure 3 The secondary switch unit K shown 2i-1 In another possible implementation, the charging control circuit is configured with only one set of secondary charging circuits, and the secondary charging circuits adopt a micro-current charging circuit, and the corresponding secondary switch units adopt Figure 4 The secondary switch unit K shown 2i-2 .

[0094] In another possible implementation, the charging control circuit can simultaneously configure two sets of secondary charging circuits, namely a trickle charging circuit and a micro-current charging circuit; the secondary switch units corresponding to the battery cells in these two sets of secondary charging circuits are respectively a trickle switch unit and a micro-current switch unit. The control process for controlling the charging of each battery cell in the controlled battery pack based on this charging control circuit may include:

[0095] For a cell voltage less than a first voltage threshold V set1 a first battery unit, controlling the main switch unit corresponding to the first battery unit to be turned on, the trickle switch unit to be turned off, and the micro-current switch unit to be turned off, so that the first battery unit is connected to the main charging circuit and charged by a larger main current;

[0096] For a cell voltage not less than the first voltage threshold V set1 , but less than the second voltage threshold V set2 a second battery unit, controlling the trickle switch unit corresponding to the second battery unit to be turned on, the main switch unit to be turned off, and the micro-current switch unit to be turned off, so that the second battery unit is connected to the trickle charging circuit and charged by a small trickle current;

[0097] For the cell voltage not less than the second voltage threshold V set2 The third battery cell is connected to the micro-current charging circuit, and the main switch unit and the trickle switch unit are turned off, so that the third battery cell is connected to the micro-current charging circuit and charged by a micro-current smaller than the trickle current until it is fully charged, that is, the cell voltage upper limit V of the battery cell is reached. max .

[0098] It can be understood that the first voltage threshold V set1 Less than the second voltage threshold V set2 , V set2 Less than the upper limit of the battery cell voltage V max ; V set1 、V set2 and V max The specific value of can be set according to the actual application scenario, and this embodiment does not limit this.

[0099] It can be seen that based on the above-mentioned charging control circuit, at a certain moment, the main charging circuit, the trickle charging circuit and the micro-current charging circuit can work simultaneously to charge different battery cells in the controlled battery pack. That is to say, the embodiment of the present disclosure switches the type of charging circuit connected to each battery cell according to the cell voltage of each battery cell, and can realize independent control of the charging process of each battery cell in the controlled battery pack. For battery cells with high cell voltage, a charging circuit with a smaller charging current is used to charge them, so as to avoid excessive voltage differences between different battery cells, and to balance the battery cells in time to improve the efficiency and effect of battery balancing.

[0100] Figure 5 The schematic diagram of the charging control circuit with two groups of secondary charging circuits is shown. Figure 5 The charging control circuit includes a main charging circuit 220, and two sets of secondary charging circuits: a trickle charging circuit 231 and a micro-current charging circuit 232; wherein the secondary switch unit in the trickle charging circuit 231 adopts the following Figure 3 The secondary switch unit K shown 2i-1 The secondary switch unit in the micro-current charging circuit 232 adopts Figure 4 The secondary switch unit K shown 2i-2 The main switch unit of the main charging circuit adopts Figure 2 The main switch unit K shown 1i (i is the serial number of the battery cell, ranging from 1 to n).

[0101] like Figure 5 As shown, taking the battery unit P1 (i.e., i=1) as an example, the main switch unit K corresponding to P1 in the main charging circuit is 11 Includes three controllable switches K 1_a , K 1_b and K 1_c In the trickle charging circuit, the trickle switch unit K corresponding to P1 21-1 Includes two variable resistors R 1_1 、R 1_2 , and three transistors Q 1_1 , Q 1_2 and Q 1_3 In the micro-current charging circuit, the micro-current switch unit K corresponding to P1 21-2 Includes two controllable switches K 1_d and K 1_e ; Other battery cells P2~P n The structures of the corresponding switch units are similar to those of P1 and will not be elaborated on here. The control terminals of the controllable units, transistors, and variable resistors in the charging control circuit are respectively connected to the charging control unit, and respond to the control signals sent by the charging control unit to turn the corresponding switch units on and off.

[0102] based on Figure 5 The charging control circuit shown in the figure still takes the battery cell P1 as an example to explain in detail the charging control process of any battery cell of the charging control unit 210:

[0103] During the entire charging process, the cell voltage V1 of the battery cell P1 is cyclically collected and its range is determined;

[0104] When V1 does not reach the first voltage threshold V set1 , that is, V1<V set1 In the case of the control main switch unit K 11 Turn on, that is, control the main switch unit K 11 The controllable switch K in 1_a , K 1_b Closed, K 1_c Disconnect and control the trickle switch unit K 21-1 And micro-current switch unit K 21-2 Disconnect, that is, control the trickle switch unit K 21-1 Transistor Q in 1_1 , Q 1_2 Turn off and control the micro current switch unit K 21-2 The controllable switch K in 1_d and K 1_e Disconnect, so that the battery cell P1 is connected to the main charging circuit 220 and charged by a larger charging current I1, so that the cell voltage V1 of the battery cell P1 gradually increases;

[0105] When V1 reaches the first voltage threshold V set1 , and V1 does not reach the second voltage threshold V set2 , that is, V set1 ≤V1<V set2 In the case of the control main switch unit K 11 Disconnect, that is, control the main switch unit K 11 The controllable switch K in 1_a , K 1_b Disconnect, K 1_c Closed, and at the same time controls the trickle switch unit K 21-1 Turn on, that is, control the trickle switch unit K 21-1 Transistor Q in 1_1 , Q 1_2 Turn on and keep the micro current switch unit K 21-2 Disconnect, that is, keep the micro-current switch unit K 21-2 The controllable switch K in 1_d and K 1_e Disconnect, so that the battery unit P1 is disconnected from the main charging circuit 220 and connected to the trickle charging circuit 231, and a smaller charging current I 1_2Charging is performed to make the cell voltage V1 of the battery cell P1 continue to rise; when V1 reaches the second voltage threshold V set2 , that is, V1≥V set2 In case of failure, keep the main switch unit K 11 Disconnect and control the trickle switch unit K 21-1 Disconnect, that is, control the trickle switch unit K 21-1 Transistor Q in 1_1 , Q 1_2 Turn off and control the micro-current switch unit K 21-2 Conducting, that is, controlling the micro-current switch unit K 21-2 The controllable switch K in 1_d and K 1_e The battery cell P1 is disconnected from the trickle charging circuit 231 and connected to the micro-current charging circuit 232, and a smaller charging current I 21-2 Charge until it is fully charged, that is, the cell voltage V1 of the battery cell P1 reaches the cell voltage upper limit V max .

[0106] In addition, in the above V set1 ≤V1<V set2 In the case of 21-1 Transistor Q in 1_3 Conducting, and through the ammeter A1, A 11 、A 12 Devices such as these collect the current I of the corresponding branch in the trickle charging circuit. 21-1 , I 1-1 and I 1-2 ,like Figure 5 As shown, the two variable resistors R are adjusted according to the current size collected. 1_1 and R 1_2 The resistance value can be adjusted to accurately control the charging current I 1_2 The size of the battery cell P1 can be precisely controlled to control the charging speed of the battery cell P1.

[0107] The charging control process of the charging control unit 210 for other battery cells is the same as the above process and will not be repeated here.

[0108] It should be noted that the charging current I 21-2 Less than the trickle charging circuit charging current I 1_2 However, the specific current value can be controlled according to actual application requirements, and this embodiment does not make any specific limitation on this.

[0109] In an optional embodiment of the present disclosure, a loop switch K may be provided in the main circuit of the trickle charging circuit. s ,like Figure 5 As shown, the circuit switch K is controlled by the charging control unit 210. s By disconnecting, each battery cell can be disconnected from the trickle charging circuit at the same time. Its control effect is equivalent to disconnecting the trickle switch units corresponding to each battery cell at the same time. In actual application scenarios, when each battery cell is fully charged, the circuit switch K can be disconnected. s To disconnect the entire trickle charging circuit, compared to disconnecting each trickle switch unit one by one, the circuit switch K s The control method is simpler and faster.

[0110] In an optional embodiment of the present disclosure, Figure 5 In the charging control circuit shown in FIG, in the micro-current charging circuit, a filter can also be set in the parallel branch corresponding to each battery cell, such as Figure 5 As shown, each fourth controllable switch K 1_d , K 2_d ,……,K n_d Filters F1, F2, ..., F in series n , used to control the micro current of the corresponding parallel branch, that is, the charging current I 21-2 , I 22-2 ,……,I 2n-2 , filtering is performed to eliminate the influence of surrounding noise and other media on microcurrent, and to achieve precise control of the microcurrent charging process.

[0111] In an optional embodiment of the present disclosure, Figure 5 In the charging control circuit shown, a safety circuit 221 may be connected in series in the main charging circuit 220. The safety circuit 221 may include two parallel branches, one of which includes a third variable resistor R connected in series. s and the fourth transistor Q s1 , the other parallel branch includes the fifth transistor Q s2 .

[0112] As can be seen from the description of the charging control process in the above embodiment, as the charging process proceeds, the voltage of more and more battery cells reaches or even exceeds the first voltage threshold V set1 , and disconnect from the main charging circuit, causing the series load in the main charging circuit to gradually decrease, and the main charging current I1 will gradually increase. If I1 is too large, such as exceeding the maximum charging current that the battery cells in the battery unit can withstand, the battery cells in the battery unit still in the main charging circuit will cause heating and even damage the battery cells.

[0113] In view of this, in order to reduce the heating of the battery cell and avoid damage to the battery cell, in the charging control circuit provided by the embodiment of the present disclosure, the current I1 in the main charging circuit is controlled by the above-mentioned safety circuit 221. The specific control process may include: at the beginning of charging, the charging control unit 210 may control the fifth transistor Q1 in the safety circuit 221 to s2 Closed, the fourth transistor Q s1 Disconnected, that is, at this time the load in the main charging circuit 220 only includes the battery cells. When a battery cell is disconnected from the main charging circuit 220, the charging control unit 210 controls the fifth transistor Q in the safety circuit 221. s2 The fourth transistor Q is disconnected. s1 Closed, so that the third variable resistor R s Connect to the main charging circuit 220 to supplement the load reduction of the main charging circuit caused by the disconnection of the battery unit; the charging control unit 210 can also control R s The resistance value is adjusted to achieve precise control of the load size in the main charging circuit 220, that is, precise control of the main charging current I1 is achieved, so that it is always within a safe range.

[0114] In another optional embodiment, the safety circuit 221 may also include only the third variable resistor R s and the fourth transistor Q s1 , by setting the third variable resistor R s The resistance of the fifth transistor Q is adjusted to 0, which is equivalent to the above-mentioned " s2 Closed, the fourth transistor Q s1 Of course, the safety circuit for controlling the current of the main charging circuit may also use other components and structures. Without inventive efforts, other forms of safety circuits may be provided in the above-mentioned charging control circuit, which is also within the scope of protection of the embodiments of the present disclosure.

[0115] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present disclosure, which will not be described one by one here.

[0116] Based on the same concept, embodiments of the present disclosure also provide a charging control method, applicable to the aforementioned charging control circuit, specifically to the charging control unit within the aforementioned charging control circuit. Because the principles underlying the problem addressed by this charging control method are similar to those of the aforementioned charging control circuit, the embodiments of this charging control method can be cross-referenced with the implementation of the aforementioned charging control circuit, and any overlaps will be omitted.

[0117] based on Figure 1The charging control circuit shown in FIG. 1 controls the switch states of each main switch unit and the secondary switch unit through the charging control unit 210, thereby realizing the control of each battery unit P1 to P1 in the controlled battery pack. n charging control. Figure 6 Flowchart of the charging control method applied to the charging control unit 210 provided in the embodiment of the present disclosure. Figure 6 The charging control method comprises the following steps:

[0118] Step S1, obtain the cell voltage of each battery cell in the controlled battery pack, and compare it with the first voltage threshold V set1 Make comparisons;

[0119] Step S2: when the cell voltage is less than the first voltage threshold V set1 a first battery unit, controlling the main switch unit corresponding to the first battery unit in the charging control circuit to be turned on and the secondary switch unit to be turned off, so that the first battery unit is connected to the main charging circuit of the charging control circuit and charged by a larger main current;

[0120] Step S3: For the cell voltage not less than the first voltage threshold V set1 a second battery unit, controlling the secondary switch unit corresponding to the second battery unit in the charging control circuit to be turned on and the main switch unit to be turned off, so that the second battery unit is connected to the secondary charging circuit of the charging control circuit and charged by a smaller secondary current;

[0121] Step S4: Determine whether the cell voltage of each battery cell has reached the cell voltage upper limit V max If yes, go to step S5, otherwise return to step S1;

[0122] In step S5, each switch unit in each charging circuit is disconnected to end the current charging process.

[0123] In an optional embodiment of the present disclosure, the charging control circuit may include two groups of secondary charging circuits, such as Figure 5 As shown, the two groups of secondary charging circuits are respectively a trickle charging circuit and a micro-current charging circuit; in view of this, in step S3 of the above charging control method, for the unit voltage not less than V set1 The second battery unit performs the following control operations:

[0124] Step S31: compare the cell voltage of the second battery cell with the second voltage threshold V set2 Make comparisons;

[0125] Step S32: For the second battery cell whose cell voltage is less than V set2a third battery cell, controlling the trickle switch unit corresponding to the third battery cell in the charging control circuit to be turned on, and the main switch unit and the micro-current switch unit to be turned off, so that the third battery cell is connected to the trickle charging circuit and charged by a trickle current smaller than the main current;

[0126] Step S33: For the second battery cell, the cell voltage is not less than V set2 The fourth battery cell controls the micro-current switch unit corresponding to the fourth battery cell in the charging control circuit to be turned on, and the main switch unit and the trickle switch unit are both disconnected, so that the fourth battery cell is connected to the above-mentioned micro-current charging circuit and charged by a micro-current smaller than the above-mentioned trickle current.

[0127] It can be seen from the above control method that based on the three groups of charging circuits in the charging control circuit, namely the main charging circuit, the trickle charging circuit and the micro-current charging circuit, according to the size of the cell voltage of the battery cell, during the charging process, the battery cell has at most three charging states, namely the main current charging state corresponding to the first battery cell mentioned above, the trickle charging state corresponding to the third battery cell and the micro-current charging state corresponding to the fourth battery cell. Battery cells with different cell voltages can be in different charging states and charged with charging currents of different sizes, so that the charging speed of different battery cells can be controlled, and then the power difference between different battery cells can be coordinated and controlled to achieve power balance.

[0128] In an optional embodiment of the present disclosure, the charging control method further includes:

[0129] When any battery unit is connected to the trickle charging circuit, the resistance of the first variable resistor and / or the second variable resistor in the corresponding trickle switch unit is adjusted to adjust the trickle charging current corresponding to the battery unit.

[0130] In this way, precise control of the trickle charging current can be achieved.

[0131] In an optional embodiment of the present disclosure, a safety circuit is further connected in series in the main charging circuit of the charging control circuit; accordingly, the charging control method further includes:

[0132] Adjust the resistance of the variable resistor in the above safety circuit.

[0133] Optionally, the resistance of the variable resistor in the above-mentioned safety circuit can be adjusted according to the number of battery cells connected to the main charging circuit, that is, as the number of battery cells connected to the main charging circuit decreases, the resistance of the variable resistor in the above-mentioned safety circuit is controlled to increase; the resistance of the variable resistor in the above-mentioned safety circuit can also be adjusted according to the current of the main charging circuit, that is, the magnitude of the main charging current, that is, when the main charging current increases, the resistance of the variable resistor in the above-mentioned safety circuit is controlled to increase, so that the main charging current is reduced to prevent it from exceeding the maximum charging current that the battery cell can withstand.

[0134] In this embodiment, the load of the entire main charging circuit is adjusted by controlling the resistance value of the safety circuit, compensating for the load reduction caused by the battery unit being disconnected from the main charging circuit, ensuring that the current of the main charging circuit is always within a safe range, and avoiding damage to the battery cells of the battery unit connected to the main charging circuit due to excessive current.

[0135] Based on the same concept, the embodiment of the present disclosure further provides a charging control device, which can be applied to the charging control circuit described in the above embodiment, for example, as the charging control unit 210 therein;

[0136] The charging control device may specifically include:

[0137] A voltage detection module, configured to obtain the cell voltage of each battery cell in the controlled battery pack and compare the cell voltage with a first voltage threshold value respectively;

[0138] a first control module, configured to control, for a first battery cell whose cell voltage is lower than the first voltage threshold, a main switch unit corresponding to the first battery cell in the charging control circuit to be turned on and a secondary switch unit to be turned off, so that the first battery cell is connected to a main charging circuit of the charging control circuit for charging;

[0139] The second control module is used to control the secondary switch unit corresponding to the second battery cell in the charging control circuit to be turned on and the main switch unit to be turned off for the second battery cell whose cell voltage is not less than the first voltage threshold, so that the second battery cell is connected to the secondary charging circuit of the charging control circuit for charging.

[0140] In an optional embodiment of the present disclosure, the charging control circuit may include two sets of secondary charging circuits, namely a trickle charging circuit and a micro-current charging circuit. In view of this, the second control module in the above-mentioned charging control device may specifically include:

[0141] a third submodule, configured to control, for a third battery cell whose cell voltage is not less than the first voltage threshold but less than the second voltage threshold, the trickle switch unit corresponding to the third battery cell in the charging control circuit to be turned on, and the main switch unit and the micro-current switch unit to be turned off, so that the third battery cell is connected to the trickle charging circuit for trickle charging;

[0142] The fourth submodule is used to control the micro-current switch unit corresponding to the fourth battery cell in the charging control circuit to be turned on, and the main switch unit and the trickle switch unit to be turned off, for the fourth battery cell whose cell voltage is not less than the second voltage threshold, so that the fourth battery cell is connected to the micro-current charging circuit for micro-current charging.

[0143] In an optional embodiment of the present disclosure, the charging control device further includes:

[0144] The trickle charge control module is used to adjust the resistance of the first variable resistor and / or the second variable resistor in the corresponding trickle charge switch unit when any battery unit is connected to the trickle charge circuit, so as to adjust the trickle charge current corresponding to the battery unit.

[0145] In an optional embodiment of the present disclosure, the charging control circuit may further include the safety circuit 221 described in the above embodiment, and the charging control device may further include:

[0146] The safety control module is used to adjust the resistance of the variable resistor in the above safety circuit to control the current in the main charging circuit to prevent it from exceeding the maximum charging current that the battery cell can withstand.

[0147] Based on the same concept, an embodiment of the present disclosure also provides a battery system, which can be an energy storage battery used in scenarios such as photovoltaic power generation and wind power generation, or a power battery used in scenarios such as electric vehicles and electric bicycles, etc.

[0148] The battery system may include: a battery pack having multiple battery cells, and a charging control circuit for controlling the charging of each battery cell in the battery pack; the charging control circuit may employ any of the charging control circuits described in the preceding embodiments, and is configured to switch the corresponding charging circuits of each battery cell according to the cell voltage. This allows battery cells with lower cell voltages to be rapidly charged via a primary charging circuit with a higher charging current, while battery cells with higher cell voltages can be slowly charged via a secondary charging circuit with a lower charging current, thereby achieving coordinated control of the charge levels of different battery cells, achieving charge balance, avoiding excessive charge differences, and improving the performance of the battery pack.

[0149] See also Figure 7 , Figure 7This is a structural block diagram of an electronic device provided in one or more embodiments of this specification. Figure 7 As shown, the electronic device 500 may include a processor 501 and a memory 502; the memory 502 may be coupled to the processor 501. Figure 7 Other types of structures may be used to supplement or replace this structure to implement telecommunication functions or other functions. Optionally, the electronic device 500 may be a management device for a battery system.

[0150] In one possible implementation, the relevant functions of the charging control unit 210 may be integrated into the processor 501. The processor 501 may be configured to perform the following operations:

[0151] Obtaining the cell voltage of each battery cell in the controlled battery pack, and comparing the cell voltage with the first voltage threshold respectively;

[0152] For a first battery cell whose cell voltage is lower than the first voltage threshold, controlling the main switch unit corresponding to the first battery cell in the charging control circuit to be turned on and the secondary switch unit to be turned off, so that the first battery cell is connected to the main charging circuit of the charging control circuit for charging;

[0153] For a second battery cell whose cell voltage is not less than the first voltage threshold, the secondary switch unit corresponding to the second battery cell in the charging control circuit is controlled to be turned on and the main switch unit is controlled to be turned off, so that the second battery cell is connected to the secondary charging circuit of the charging control circuit for charging.

[0154] In addition, in some optional implementations, the electronic device 500 may further include: a communication module, an input unit, an audio processor, a display, a power supply, etc. It is worth noting that the electronic device 500 does not necessarily have to include Figure 7 In addition, the electronic device 500 may also include all components shown in Figure 7 For components not shown, reference may be made to the prior art.

[0155] In some optional implementations, the processor 501 is sometimes also referred to as a controller or operation control, and may include a microprocessor or other processor device and / or logic device, which receives input and controls the operation of various components of the electronic device 500.

[0156] Memory 502 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store the aforementioned information related to the battery management system and may also store programs that execute the relevant information. Processor 501 may execute the programs stored in memory 502 to implement information storage or processing.

[0157] The input unit can provide input to the processor 501. The input unit can be, for example, a keypad or a touch input device. The power supply can be used to provide power to the electronic device 500. The display can be used to display objects such as images and text. The display can be, for example, an LCD display, but is not limited thereto.

[0158] The memory 502 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, or the like. Alternatively, it may be a memory that retains information even when power is off, can be selectively erased, and is provided with more data. Examples of such memory are sometimes referred to as EPROMs. The memory 502 may also be some other type of device. The memory 502 includes a buffer memory (sometimes referred to as a buffer). The memory 502 may include an application / function storage unit for storing application programs and function programs or processes for executing the operation of the electronic device 500 via the processor 501.

[0159] The memory 502 may also include a data storage unit for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit of the memory 502 may include various driver programs for the computer device for communication functions and / or for executing other functions of the computer device (such as a messaging application, a contact book application, etc.).

[0160] The embodiment of the present disclosure also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the various steps of the above-mentioned charging control method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0161] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0162] An embodiment of the present disclosure further provides a chip, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various steps of the above method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0163] It should be understood that the chip mentioned in the embodiments of the present disclosure can also be called a system-level chip, a system chip, a chip system, or a system-on-chip chip, etc.

[0164] The embodiments of the present disclosure further provide a computer program product, which includes: a computer program or instructions. When the computer program or instructions are executed on a computer, the computer implements the various steps of the above-mentioned method embodiments and can achieve the same technical effects. To avoid repetition, they are not described here.

[0165] The various embodiments in this specification are described in a progressive manner. Similar portions between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the device and system embodiments are generally similar to the method embodiments, so their descriptions are relatively simple. For relevant portions, refer to the descriptions of the method embodiments.

[0166] Although one or more embodiments of this specification provide method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative work. The order of steps listed in the embodiments is only one way of executing the steps among many steps and does not represent the only execution order. When an actual device or client product is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, in a parallel processor or multi-threaded processing environment).

[0167] In the description of this application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of this application. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on this application.

[0168] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0169] The present application has been described above in conjunction with preferred embodiments, but these embodiments are merely exemplary and serve only as an illustrative example. On this basis, various replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A charging control circuit, characterized in that: include: A charging control unit, a primary charging circuit and at least one set of secondary charging circuits; The main charging circuit includes a main switch unit corresponding to each battery cell in the controlled battery pack; the secondary charging circuit includes a secondary switch unit corresponding to each battery cell in the controlled battery pack; the charging current of the main charging circuit is greater than the charging current of the secondary charging circuit; The charging control unit is connected to the primary charging circuit and the secondary charging circuit respectively; The charging control unit is used for: Obtaining the cell voltage of each battery cell in the controlled battery pack, and comparing the cell voltage with a first voltage threshold respectively; For a first battery cell whose cell voltage is less than the first voltage threshold, controlling the main switch unit corresponding to the first battery cell to be turned on and the secondary switch unit to be turned off, so that the first battery cell is connected to the main charging circuit and charged by the charging current of the main charging circuit; When the charging control circuit includes a set of the secondary charging circuits, for a second battery cell whose cell voltage is not less than the first voltage threshold, the secondary switch unit corresponding to the second battery cell is controlled to be turned on and the main switch unit is controlled to be turned off, so that the second battery cell is connected to the secondary charging circuit and charged by the charging current of the secondary charging circuit; When the charging control circuit includes two groups of secondary charging circuits, for a second battery cell whose cell voltage is not less than the first voltage threshold, the cell voltage thereof is compared with a second voltage threshold, and when the cell voltage of the second battery cell is less than the second voltage threshold, the second battery cell is controlled to be disconnected from the main charging circuit and connected to the first charging circuit of the two groups of secondary charging circuits for charging; and when the cell voltage of the second battery cell is not less than the second voltage threshold, the second battery cell is controlled to be disconnected from the main charging circuit and connected to the second charging circuit of the two groups of secondary charging circuits for charging; The first voltage threshold is smaller than the second voltage threshold, and the charging current of the first charging circuit is larger than the charging current of the second charging circuit.

2. The charging control circuit according to claim 1, wherein: The main switch unit includes: a first controllable switch connected in series with the positive electrode of the corresponding battery cell, a second controllable switch connected in series with the negative electrode of the corresponding battery cell, and a third controllable switch connected in parallel with the series circuit formed by the first controllable switch, the corresponding battery cell, and the second controllable switch; When the first controllable switch and the second controllable switch are both closed and the third controllable switch is open, the corresponding battery unit is connected to the main charging circuit; when the first controllable switch and the second controllable switch are both open and the third controllable switch is closed, the corresponding battery unit is disconnected from the main charging circuit.

3. The charging control circuit according to claim 1, wherein: The first charging circuit includes a trickle charging circuit; The secondary switch unit in the trickle charging circuit includes a trickle switch unit; The trickle switch unit comprises: a first transistor connected in series with the positive electrode of the corresponding battery cell, a second transistor connected in series with the negative electrode of the corresponding battery cell, and a second variable resistor and a third transistor connected in parallel with the series circuit formed by the first transistor, the corresponding battery cell, and the second transistor; When the first transistor and the second transistor are both turned on and the third transistor is turned off, the corresponding battery cell is connected to the trickle charging circuit; when the first transistor and the second transistor are both turned off and the third transistor is turned on, the corresponding battery cell is disconnected from the trickle charging circuit.

4. The charging control circuit according to claim 3, characterized in that: The second charging circuit includes a micro-current charging circuit; The secondary switch unit in the micro-current charging circuit includes a micro-current switch unit; The micro-current switch unit includes: a fourth controllable switch connected in series with the positive electrode of the corresponding battery cell, and a fifth controllable switch connected in series with the negative electrode of the corresponding battery cell; When the fourth controllable switch and the fifth controllable switch are both closed, the corresponding battery unit is connected to the micro-current charging circuit; when the fourth controllable switch and the fifth controllable switch are both opened, the corresponding battery unit is disconnected from the micro-current charging circuit.

5. The charging control circuit according to claim 4, characterized in that: The charging control unit is specifically used for: When the cell voltage of the second battery cell is less than a second voltage threshold, controlling the trickle switch unit corresponding to the second battery cell to be turned on, and the main switch unit and the micro-current switch unit to be turned off, so that the second battery cell is connected to the trickle charging circuit for charging; When the cell voltage of the second battery cell is not less than the second voltage threshold, the microcurrent switch unit corresponding to the second battery cell is controlled to be turned on, and the main switch unit and the trickle switch unit are both disconnected, so that the second battery cell is connected to the microcurrent charging circuit for charging.

6. The charging control circuit according to claim 1, wherein: The main charging circuit also includes a safety circuit for adjusting the charging current of the main charging circuit under the control of the charging control unit; The safety circuit includes a third variable resistor and a fourth transistor connected in series.

7. A charging control method, characterized in that: Applied to charging control circuit; The charging control circuit includes a main charging circuit and at least one set of secondary charging circuits; the main charging circuit includes a main switch unit corresponding to each battery cell in the controlled battery pack; the secondary charging circuit includes a secondary switch unit corresponding to each battery cell in the controlled battery pack; the main charging current of the main charging circuit is greater than the secondary charging current of the secondary charging circuit; The method comprises: Obtaining the cell voltage of each battery cell in the controlled battery pack, and comparing the cell voltage with the first voltage threshold respectively; For a first battery cell whose cell voltage is less than the first voltage threshold, controlling the main switch unit corresponding to the first battery cell in the charging control circuit to be turned on and the secondary switch unit to be turned off, so that the first battery cell is connected to the main charging circuit of the charging control circuit and is charged by the charging current of the main charging circuit; When the charging control circuit includes a set of the secondary charging circuits, for a second battery cell whose cell voltage is not less than the first voltage threshold, the secondary switch unit corresponding to the second battery cell in the charging control circuit is controlled to be turned on and the main switch unit is controlled to be turned off, so that the second battery cell is connected to the secondary charging circuit of the charging control circuit and charged by the charging current of the secondary charging circuit; When the charging control circuit includes two groups of secondary charging circuits, for a second battery cell whose cell voltage is not less than the first voltage threshold, the cell voltage thereof is compared with a second voltage threshold, and when the cell voltage of the second battery cell is less than the second voltage threshold, the second battery cell is controlled to be disconnected from the main charging circuit and connected to the first charging circuit of the two groups of secondary charging circuits for charging; and when the cell voltage of the second battery cell is not less than the second voltage threshold, the second battery cell is controlled to be disconnected from the main charging circuit and connected to the second charging circuit of the two groups of secondary charging circuits for charging; The first voltage threshold is smaller than the second voltage threshold, and the charging current of the first charging circuit is larger than the charging current of the second charging circuit.

8. The charging control method according to claim 7, characterized in that: The first charging circuit includes a trickle charging circuit, and the secondary switch unit in the trickle charging circuit includes a trickle switch unit; the second charging circuit includes a micro-current charging circuit, and the secondary switch unit in the micro-current charging circuit includes a micro-current switch unit; When the cell voltage of the second battery cell is less than the second voltage threshold, controlling the second battery cell to be disconnected from the main charging circuit and connected to the first charging circuit for charging includes: for a third battery cell whose cell voltage is not less than the first voltage threshold but less than the second voltage threshold, controlling the trickle switch unit corresponding to the third battery cell in the charging control circuit to be turned on, and the main switch unit and the micro-current switch unit to be turned off, so that the third battery cell is connected to the trickle charging circuit for trickle charging; When the cell voltage of the second battery cell is not less than the second voltage threshold, the second battery cell is controlled to be disconnected from the main charging circuit and connected to the second charging circuit for charging, including: for the fourth battery cell whose cell voltage is not less than the second voltage threshold, the micro-current switch unit corresponding to the fourth battery cell in the charging control circuit is controlled to be turned on, and the main switch unit and the trickle switch unit are both disconnected, so that the fourth battery cell is connected to the micro-current charging circuit for micro-current charging.

9. A charging control device, characterized in that: Applied to charging control circuit; The charging control circuit includes a main charging circuit and at least one set of secondary charging circuits; the main charging circuit includes a main switch unit corresponding to each battery cell in the controlled battery pack; the secondary charging circuit includes a secondary switch unit corresponding to each battery cell in the controlled battery pack; The charging current of the primary charging circuit is greater than the charging current of the secondary charging circuit; The charging control device includes: A voltage detection module, configured to obtain the cell voltage of each battery cell in the controlled battery pack and compare the cell voltage with a first voltage threshold value respectively; a first control module, configured to control, for a first battery cell whose cell voltage is less than the first voltage threshold, a primary switch unit corresponding to the first battery cell in the charging control circuit to be turned on and a secondary switch unit to be turned off, so that the first battery cell is connected to a primary charging circuit of the charging control circuit and is charged by the charging current of the primary charging circuit; a second control module, configured to, when the charging control circuit includes one set of the secondary charging circuits, control, for a second battery cell whose cell voltage is not less than the first voltage threshold, to turn on a secondary switch unit corresponding to the second battery cell and to turn off a primary switch unit in the charging control circuit, so that the second battery cell is connected to the secondary charging circuit of the charging control circuit and charged by the charging current of the secondary charging circuit; and, when the charging control circuit includes two sets of secondary charging circuits, compare the cell voltage of the second battery cell whose cell voltage is not less than the first voltage threshold with a second voltage threshold, and, if the cell voltage of the second battery cell is less than the second voltage threshold, control the second battery cell to be disconnected from the main charging circuit and connected to the first charging circuit of the two sets of secondary charging circuits for charging; and, when the cell voltage of the second battery cell is not less than the second voltage threshold, control the second battery cell to be disconnected from the main charging circuit and connected to the second charging circuit of the two sets of secondary charging circuits for charging; The first voltage threshold is smaller than the second voltage threshold, and the charging current of the first charging circuit is larger than the charging current of the second charging circuit.

10. A battery system, characterized in that: include: A battery pack, and a charging control circuit according to any one of claims 1 to 6.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 7 to 8 are implemented.

12. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 7 to 8.

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