CN118381152A

CN118381152A - Charging control circuit, method and device and battery system using same

Info

Publication number: CN118381152A
Application number: CN202410515072.3A
Authority: CN
Inventors: 马蓉芳; 杨凯; 许杰; 李国城; 祝李静; 王淼; 章洪铨; 吴博祥; 吴文磊
Original assignee: Trina Energy Storage Solutions Jiangsu Co Ltd
Current assignee: Trina Energy Storage Solutions Jiangsu Co Ltd
Priority date: 2024-04-26
Filing date: 2024-04-26
Publication date: 2024-07-23

Abstract

The present disclosure relates to a charging control circuit, method, device and battery system using the same. The present disclosure sets a main charging circuit and at least one group of secondary charging circuits in the charging control circuit. For a battery cell whose single cell voltage is 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, so that the battery cell is connected to the main charging circuit and quickly charged with a larger charging current. For a battery cell whose single cell voltage is 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, so that the battery cell is disconnected from the main charging circuit and connected to the secondary charging circuit instead, and continues to be charged with a smaller charging current, and the charging speed is reduced. In this way, by independently controlling each battery cell in the controlled battery group, the battery cell with a higher cell voltage is charged with a smaller charging current, the difference in the amount of electricity between different battery cells is reduced, and the amount of electricity is balanced.

Description

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

Technical Field

The disclosure relates to the technical field of batteries, and in particular relates to a charging control circuit, a charging control method, a charging control device and a battery system using the charging control circuit.

Background

In the application field of large-capacity batteries such as electric automobiles, a plurality of single batteries are generally required to be connected in series, parallel or series-parallel, so as to form a battery pack with voltage and capacity meeting actual application requirements. In the use process, the voltage or the capacity of different single batteries in the battery pack can be different, and the difference gradually increases along with the delay of the use time; thus, during the charge and discharge of the battery pack, the unit cells with the lowest capacity limit the overall charge and discharge of the battery pack, resulting in a reduction in the overall capacity of the battery pack.

In the related art, an active equalization scheme or a passive equalization scheme is often adopted to perform electric quantity equalization on the battery pack so as to reduce electric quantity difference among different single batteries. The energy storage devices such as a capacitor, an inductor and the like are actively balanced, and the balancing speed is low; and passive equalization is realized by consuming the electric quantity of the high-capacity single battery, so that energy waste is caused.

In view of this, there is a need for an efficient, energy-efficient battery level balancing scheme.

Disclosure of Invention

An object of the embodiments of the present disclosure is to provide a charging control circuit, a charging control method, a charging control device, and a battery system using the same, so as to improve the electric quantity equalization efficiency of a battery pack and reduce energy waste.

In a first aspect, embodiments of the present disclosure provide a charge control circuit, including: the charging control unit, the main charging loop and at least one group of secondary charging loops;

The main charging loop comprises main switch units which are in one-to-one correspondence with all battery units in the controlled battery pack; the secondary charging loop comprises secondary switch units which are in one-to-one correspondence with all battery units in the controlled battery pack; the charging current of the primary charging loop is greater than the charging current of the secondary charging loop;

The charging control unit is respectively connected with the main charging loop and the secondary charging loop;

The charging control unit is used for acquiring the unit voltage of each battery unit in the controlled battery pack and comparing the unit voltage with a first voltage threshold value respectively; for a first battery unit with the unit voltage smaller than the first voltage threshold, controlling a main switch unit corresponding to the first battery unit to be conducted and a secondary switch unit to be disconnected so that the first battery unit is connected into the main charging loop for charging; and for the second battery unit with the unit voltage not smaller than the first voltage threshold, controlling the secondary switch unit corresponding to the second battery unit to be conducted and the primary switch unit to be disconnected so as to enable the second battery unit to be connected into the secondary charging loop for charging.

In an alternative embodiment, the main switching 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 a 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 opened, the corresponding battery unit is connected to the main charging loop; and under the condition that the first controllable switch and the second controllable switch are both opened and the third controllable switch is closed, the corresponding battery unit is disconnected from the main charging loop.

In an alternative embodiment, the secondary charging loop comprises a trickle charging loop;

A sub-switching unit in the trickle charge loop, comprising a trickle switching unit;

the trickle switch unit includes:

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 a 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 on and the third transistor is off, the corresponding battery unit is connected to the trickle charge loop; and under the condition that the first transistor and the second transistor are both turned off and the third transistor is turned on, the corresponding battery unit is disconnected from the trickle charge loop.

In an alternative embodiment, the secondary charging loop further comprises a microcurrent charging loop; the charging current of the micro-current charging loop is smaller than the charging current of the trickle charging loop;

The secondary switch unit in the micro-current charging loop comprises a micro-current switch unit;

the micro-current switching 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;

Under the condition that the fourth controllable switch and the fifth controllable switch are both closed, the corresponding battery unit is connected into the micro-current charging loop; and under the condition that the fourth controllable switch and the fifth controllable switch are both disconnected, the corresponding battery unit is disconnected with the micro-current charging loop.

In an alternative embodiment, the charge control unit is configured to, for a second battery cell whose cell voltage is not less than the first voltage threshold,

When the cell voltage of the second battery cell is smaller than a second voltage threshold, controlling the trickle switch cell corresponding to the second battery cell to be conducted, and the main switch cell and the micro-current switch cell to be disconnected so that the second battery cell is connected into the trickle charging loop for charging;

controlling a micro-current switch unit corresponding to the second battery unit to be conducted and the main switch unit and the trickle switch unit to be disconnected under the condition that the unit voltage of the second battery unit is not smaller than a second voltage threshold value so that the second battery unit is connected into the micro-current charging loop for charging;

wherein the first voltage threshold is less than the second voltage threshold.

In an alternative embodiment, the main charging circuit further comprises a safety circuit for regulating the main charging current under the control of the charging control unit;

the safety circuit includes a third variable resistor and a fourth transistor connected in series.

In a second aspect, embodiments of the present disclosure provide a variety of charge control methods applied to a charge control circuit;

The charging control circuit comprises a main charging loop and at least one group of secondary charging loops; the main charging loop comprises main switch units which are in one-to-one correspondence with all battery units in the controlled battery pack; the secondary charging loop comprises secondary switch units which are in one-to-one correspondence with all battery units in the controlled battery pack; the primary charging current of the primary charging loop is greater than the secondary charging current of the secondary charging loop;

The method comprises the following steps:

obtaining unit voltages of all battery units in a controlled battery pack, and comparing the unit voltages with a first voltage threshold value respectively;

For a first battery unit with the unit voltage smaller than the first voltage threshold, controlling a main switch unit corresponding to the first battery unit in the charging control circuit to be conducted, and controlling a secondary switch unit to be disconnected, so that the first battery unit is connected into a main charging loop of the charging control circuit for charging;

And for the second battery unit with the unit voltage not smaller than the first voltage threshold, controlling a secondary switch unit corresponding to the second battery unit in the charging control circuit to be conducted and a primary switch unit to be disconnected, so that the second battery unit is connected into a secondary charging loop of the charging control circuit for charging.

In an alternative embodiment, the secondary charging loop in the charging control circuit comprises two groups, namely a trickle charging loop and a micro-current charging loop;

and for the second battery unit with the unit voltage not smaller than the first voltage threshold, controlling the secondary switch unit corresponding to the second battery unit to be switched on and the primary switch unit to be switched off in the charging control circuit, wherein the method comprises the following steps of:

For a third battery unit with the unit voltage not smaller than the first voltage threshold but smaller than a second voltage threshold, controlling a trickle switch unit corresponding to the third battery unit in the charging control circuit to be conducted, and switching off a main switch unit and a micro-current switch unit so that the third battery unit is connected into the trickle charging loop to perform trickle charging;

And for a fourth battery unit with the unit voltage not smaller than the second voltage threshold, controlling a micro-current switch unit corresponding to the fourth battery unit in the charging control circuit to be conducted, and opening a main switch unit and a trickle switch unit so that the fourth battery unit is connected into the micro-current charging loop to conduct micro-current charging.

In a third aspect, embodiments of the present disclosure provide a charging control device applied to a charging control circuit;

the charge control device includes:

The voltage detection module is used for acquiring the unit voltage of each battery unit in the controlled battery pack and comparing the unit voltage with a first voltage threshold value respectively;

The first control module is used for controlling a first battery unit with the unit voltage smaller than the first voltage threshold value to be conducted by a main switch unit corresponding to the first battery unit and to be disconnected by a secondary switch unit in the charging control circuit so that the first battery unit is connected into a main charging loop of the charging control circuit for charging;

And the second control module is used for controlling the secondary switch unit corresponding to the second battery unit in the charging control circuit to be conducted and the primary switch unit to be disconnected for the second battery unit with the unit voltage not smaller than the first voltage threshold value so as to enable the second battery unit to be connected into the secondary charging loop of the charging control circuit for charging.

In an alternative embodiment, the charging control circuit may include two sets of secondary charging loops, namely a trickle charging loop and a micro-current charging loop; the second control module in the above-mentioned charge control device may specifically include:

A third sub-module, configured to control, for a third battery unit whose unit voltage is not less than the first voltage threshold but less than a second voltage threshold, on-state of a trickle switch unit, a main switch unit, and a micro-current switch unit corresponding to the third battery unit in the charge control circuit, so that the third battery unit is connected to the trickle charge circuit to perform trickle charge;

And the fourth sub-module is used for controlling the micro-current switch unit corresponding to the fourth battery unit in the charging control circuit to be conducted and the main switch unit and the trickle switch unit to be disconnected for the fourth battery unit with the unit voltage not smaller than the second voltage threshold value so that the fourth battery unit is connected into the micro-current charging loop to conduct micro-current charging.

In a fourth aspect, embodiments of the present disclosure provide a battery system, comprising: a battery pack, and a charge control circuit as described in the first aspect.

In a fifth aspect, embodiments of the present disclosure provide a computer readable storage medium having a computer program stored thereon, characterized in that the program, when executed by a processor, implements a method as described in the second aspect above.

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

A memory having a computer program stored thereon;

a processor for executing the computer program in the memory to implement the method as described in the second aspect above.

As can be seen from the foregoing embodiments, first, in the embodiments of the present disclosure, at least two sets of charging loops, that is, a primary charging loop and at least one set of secondary charging loops, are set in a charging control circuit, and according to the cell voltages of each battery cell in a controlled battery pack, the charging loops to which each battery cell is connected are switched, where under the condition that the cell voltages of the battery cells are smaller than a first voltage threshold, the corresponding primary switching unit is controlled to be turned on, and the secondary switching unit is controlled to be turned off, so that the battery cell is connected to the primary charging loop and is rapidly charged by a larger charging current, and under the condition that the cell voltages of the battery cells are not smaller than the first voltage threshold, the corresponding primary switching unit is controlled to be turned off, the secondary switching unit is controlled to be turned on, so that the battery cell is disconnected from the primary charging loop, and is changed into the secondary charging loop, and charging is continued by a smaller charging current, and the charging speed is reduced. In this way, each battery unit in the controlled battery pack is independently controlled, so that the battery unit with lower unit voltage is charged through larger charging current, and the battery unit with higher unit voltage is charged through smaller charging current, so that the voltage difference between different battery units is gradually reduced, and the electric quantity difference between different battery units is gradually reduced, thereby achieving the purpose of electric quantity balance. In the electric quantity balancing process, the electric quantity of the battery unit with higher voltage is not required to be consumed, energy waste is avoided, energy storage devices such as an inductor and a capacitor are not required, electric quantity balancing is realized by reducing the charging current of the high-voltage battery unit, control logic is simple and easy to realize, and the electric quantity balancing effect and balancing speed can be improved.

Secondly, in the embodiment of the disclosure, two groups of secondary charging loops, namely a trickle charging loop and a micro-current charging loop, may be set in the charging control circuit, and 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 switching unit corresponding to the battery cell is controlled to be turned on, so that the battery cell is connected to the trickle charging loop, and charging is performed through trickle current; when the cell voltage of the battery cell is not smaller than the second voltage threshold, the micro-current switch unit corresponding to the battery cell is controlled to be conducted, so that the battery cell is connected into the micro-current charging loop, and charging is carried out through micro-current until the battery cell is full. In the embodiment of the disclosure, the battery cells with different cell voltages can be in different charging states, and charging currents with different magnitudes are adopted for charging, so that the charging speeds of the different battery cells can be controlled, and further the electric quantity difference among the different battery cells is coordinated and controlled, so that electric quantity balance is realized.

In the embodiment of the disclosure, the trickle switch unit is provided with the variable resistor, and the trickle charging current can be regulated by regulating the resistance value of the variable resistor, so that the trickle charging current can be accurately controlled.

In addition, in the embodiment of the disclosure, the safety circuit is further connected in series in the main charging circuit, and the load of the whole main charging circuit can be adjusted by controlling the resistance of the safety circuit, so that the current of the main charging circuit is adjusted to be always in a safety range, and the damage of the battery core of the battery unit connected into the main charging circuit due to overlarge current is avoided.

Drawings

Fig. 1 shows a schematic diagram of a charge control circuit provided by an embodiment of the present disclosure;

Fig. 2 shows a circuit schematic of a main switch unit in a charge control circuit of an embodiment of the present disclosure;

fig. 3 shows a circuit schematic of a secondary switching unit in a charge control circuit of an embodiment of the present disclosure;

Fig. 4 shows a circuit schematic of another secondary switching unit in the charge control circuit of an embodiment of the present disclosure;

FIG. 5 illustrates a schematic diagram of another charge control circuit provided by an embodiment of the present disclosure;

fig. 6 shows a flowchart of a charge control method provided by an embodiment of the present disclosure;

fig. 7 shows a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure.

Detailed Description

The application is further described in detail below by means of the figures and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used herein to mean "serving as an example, embodiment, 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 illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.

The following describes in detail, by way of specific embodiments, a charging control circuit, a method, an apparatus, and a battery system using the same according to embodiments of the present disclosure with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a charge control circuit according to an embodiment of the present disclosure, which may be used to control the charge of any controlled battery pack. As shown in fig. 1, the controlled battery pack 100 may include a plurality of battery cells P1, P2, … …, pn; in different application scenarios, each battery cell may contain one or more unit cells.

Referring to fig. 1, the charge control circuit 200 may include: a charge control unit 210, a primary charging loop 220, and a secondary charging loop 230. The main charging circuit 220 includes a main switch unit K ₁₁～K_1n corresponding to each battery unit P ₁～P_n in the controlled battery pack 100 one by one; the secondary charging circuit 230 includes secondary switch units K ₂₁～K_2n corresponding to the battery units P ₁～P_n in the controlled battery pack 100 one by one; the charging current I ₁ of the primary charging loop 220 is greater than the charging current I ₂ of the secondary charging loop 230.

The charging control unit 210 is connected to the primary charging circuit 220 and the secondary charging circuit 230, and is configured to generate a corresponding control signal according to the cell voltage V ₁～V_n of each battery cell P ₁～P_n, and send the control signal to the corresponding primary switching unit or the secondary switching unit to control the switching state of the primary switching unit or the secondary switching unit, so that the corresponding battery cell is connected to the primary charging circuit 220 or the secondary charging circuit 230, and is charged by the charging current I ₁ or I ₂.

Specifically, in order to achieve the electric quantity balance between the battery cells, the control logic of the charging control unit 210 for each switch unit is as follows: respectively obtaining the cell voltage V ₁～V_n of each battery cell P ₁～P_n in the controlled battery pack, and respectively comparing with a first voltage threshold V _set1; for a first battery unit with the unit voltage smaller than the first voltage threshold V _set1, controlling a main switch unit corresponding to the first battery unit to be conducted and a secondary switch unit to be disconnected so that the first battery unit is connected into the main charging loop for charging; and for the second battery unit with the unit voltage not smaller than the first voltage threshold V _set1, controlling the secondary switch unit corresponding to the second battery unit to be switched on and the primary switch unit to be switched off so as to enable the second battery unit to be connected into the secondary charging loop for charging.

That is, in this embodiment, the charge control unit controls the switching states of the main switch unit and the sub switch unit corresponding to each battery unit, and for any battery unit P _i (I is the serial number of the battery unit, the value range is 1-n), when the unit voltage V _i is smaller, that is, V _i＜V_set1, the battery unit is charged by the larger charging current I ₁ in the main charging circuit, so that the battery unit P _i is quickly stored, and the charging efficiency is improved; after the cell voltage V _i reaches the first voltage threshold V _set1, i.e., V _i≥V_set1, the smaller charging current I ₂ in the secondary charging loop is used to charge the cell, so as to reduce the storage speed of the battery cell P _i.

As can be seen from the above structure, the charge control circuit provided in the embodiment of the present disclosure controls the switching states of the main switch unit and the sub switch unit corresponding to the battery units one by one according to the unit voltages of each battery unit in the controlled battery pack, so that the battery unit is connected to the main charge loop and is rapidly charged by a larger charge current when the unit voltage of the battery unit is smaller than the first voltage threshold, and the battery unit is disconnected from the main charge loop and is changed to the sub charge loop and is continuously charged by a smaller charge current when the unit voltage of the battery unit is not smaller than the first voltage threshold, the charge speed is reduced, and the battery units with other unit voltages still smaller than the first voltage threshold are not affected, so that the battery unit can be continuously rapidly charged in the main charge loop by the larger charge current; therefore, the battery cells with lower cell voltages in the controlled battery pack are charged through larger charging currents, and the battery cells with higher cell voltages are charged through smaller charging currents, so that the voltage difference between different battery cells is gradually reduced, the electric quantity difference between different battery cells is gradually reduced, and the purpose of electric quantity balance is achieved. In the electric quantity balancing process, the electric quantity of the battery unit with higher voltage is not required to be consumed, energy waste is avoided, energy storage devices such as an inductor and a capacitor are not required, electric quantity balancing is realized by reducing the charging current of the high-voltage battery unit, control logic is simple and easy to realize, and the electric quantity balancing effect and balancing speed can be improved.

Optionally, in an embodiment of the present disclosure, the charging control unit 210 may include a voltage collecting module corresponding to each battery unit one-to-one to collect the voltage unit V ₁～V_n of each battery unit P ₁～P_n. The specific implementation of the voltage acquisition module may be various, for example, may be implemented by a voltmeter, as shown in fig. 1, to directly measure the cell voltage V _i (i=1, 2., n.) of the corresponding battery cell P _i; the cell voltage V _i of the corresponding battery cell Pi can be obtained through calculation according to ohm's law; in an actual application scenario, a specific form of the voltage acquisition module may be determined according to specific application requirements, which is not limited by the embodiments of the present disclosure.

In an alternative embodiment of the present disclosure, the individual battery cells in the main charging circuit 220 may be connected in series; accordingly, as shown in fig. 2, for any battery unit P _i, the corresponding main switch unit K _1i may specifically include:

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

The charging control unit 210 controls the main switch unit K _1i with the above structure, so as to realize that the battery unit P _i is connected to or disconnected from the main charging circuit, and the control logic is as follows: in the case where the cell voltage V _i of the battery cell P _i is less than the first voltage threshold V _set1, The charge control unit 210 controls the first controllable switch K _{1i_a} and the second controllable switch K _{1i_b} to be both closed, and the third controllable switch K _{1i_c} to be opened, The battery cell P _i can be connected in series to the main charging circuit; In the case where the cell voltage V _i of the battery cell P _i is not less than the first voltage threshold V _set1, the charge control unit 210 controls the battery cell P by transmitting a control signal to the main switching unit K _1i, the first controllable switch K _{1i_a} and the second controllable switch K _{1i_b} are both controlled to be opened, and the third controllable switch K _{1i_c} is closed, the battery unit P _i is short-circuited by the third controllable switch K _{1i_c}, Whereby the battery cell P _i is disconnected from the main charging circuit.

It should be noted that, the first controllable switch, the second controllable switch, the third controllable switch, etc. may specifically be any electronic switch such as a thyristor, a transistor, a field effect transistor, a thyristor, a relay, etc., and the specific implementation form of the controllable switch is not limited in this embodiment.

In the embodiment of the disclosure, the structure and the control logic of the main switch unit are simple and easy to realize, so that the cost can be saved and the control effect can be ensured.

As shown in fig. 1, different battery units may be connected in parallel to the secondary charging circuit 230, and various specific implementations of the corresponding secondary switching units are also possible. As an example, fig. 3 and 4 show a specific implementation of two secondary switching units, respectively, which are explained below.

In an alternative embodiment of the present disclosure, as shown in fig. 3, for any battery unit P _i, the corresponding secondary switch unit K _2i-1 may specifically include:

A first transistor Q _{i_1} connected in series with the positive electrode of the corresponding battery cell P _i, a second transistor Q _{i_2} connected in series with the negative electrode of the corresponding battery cell P _i, and a second variable resistor R _{i_2} and a third transistor Q _{i_3} connected in parallel with a series circuit formed by the first transistor Q _{i_1}, the corresponding battery cell P _i, and the second transistor Q _{i_2}.

In this embodiment, the charging control unit 210 controls the secondary switch unit K _2i-1 with the above structure, and the specific control manner is as follows: in the case where the cell voltage V _i of the battery cell P _i is not less than the first voltage threshold V _set1, I.e., in the case where it is necessary to switch the battery cell P _i into the secondary charging loop, the charging control unit 210 controls both the first transistor Q _{i_1} and the second transistor Q _{i_2} to be turned on by transmitting a control signal to the secondary switching unit K _2i-1, And the third transistor Q _{i_3} is turned off, the battery unit P _i is connected to the secondary charging circuit, and is charged by the smaller charging current I _{i_2}; In the case where the battery unit P _i needs to be disconnected from the secondary charging circuit, the charging control unit 210 may send a control signal to the secondary switching unit K _2i-1, controlling the first transistor Q _{i_1} and the second transistor Q _{i_2} to be turned off, And third transistor Q _{i_3} is turned on, battery cell P _i is disconnected from the secondary charging loop.

Alternatively, as shown in fig. 3, in the above-mentioned sub-switching unit K _2i-1, a series circuit formed by the first transistor Q _{i_1}, the battery cell P _i, and the second transistor Q _{i_2}, and a series circuit formed by the second variable resistor R _{i_2} and the third transistor Q _{i_3} are connected in parallel with each other, and the first variable resistor R _{i_1} may also be connected in series in a main circuit of the parallel circuit.

When the battery unit P _i is charged by the secondary charging circuit in which the secondary switching unit K _2i-1 shown in fig. 3 is located, the charging current is I _{i_2}, the current flowing through the second variable resistor R _{i_2} is I _{i_3}, and the total current of the parallel circuit is exactly equal to the sum of the branch currents, so that the current I _{i_1}＝I_{i_2}+I_{i_3} flows through the first variable resistor R _{i_1}.

In view of this, in the embodiment of the disclosure, the control manner of the charging control unit 210 to the secondary switch unit K _2i-1 may also be: under the condition that the battery unit P _i is required to be connected into the secondary charging loop, the first transistor Q _{i_1}, the second transistor Q _{i_2} and the third transistor Q _{i_3} are controlled to be in a conducting state, coarse adjustment of the parallel current I _{i_1} and the two branch currents I _{i_2}、I_{i_3} is achieved by adjusting the resistance value of the first variable resistor R _{i_1}, and fine adjustment of the charging current I _{i_2} is achieved by adjusting the resistance value of the second variable resistor R _{i_2}.

It can be seen that, the embodiment of the disclosure is based on the secondary switch unit with the structure shown in fig. 3, which not only can realize that each battery unit is connected to or disconnected from the secondary charging circuit, but also can respectively regulate the charging current of each battery unit connected to the secondary charging circuit, so as to realize the precise control of the charging current, thereby precisely controlling the charging speed of the battery units, reducing the electric quantity difference between different battery units, and improving the electric quantity balancing effect.

In other possible implementations, for the secondary switch unit K _2i-1 shown in fig. 3, other control manners may be adopted according to actual application requirements, for example: in the case where the battery cell P _i needs to be connected to the secondary charging loop, 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} to be all turned on; in the case where the battery cell P _i needs to be disconnected from the secondary charging loop, 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} to be turned off. In addition, other forms of sub-switching units may be obtained by modification of the structure shown in fig. 3, for example, omitting the second variable resistor R _{i_2} or the third transistor Q _{i_3}, and any modification of the switching unit structure without the need for creative labor is within the scope of the disclosure.

According to practical application, the first transistor Q _{i_1}, the second transistor Q _{i_1}, and the third transistor Q _{i_3} may be insulated gate bipolar transistors (Insulate-Gate Bipolar Transistor, IGBTs) or field effect transistors, which are not limited in this embodiment.

In an alternative embodiment of the present disclosure, as shown in fig. 4, for any battery unit P _i, the corresponding secondary switch unit K _2i-2 may specifically include:

A fourth controllable switch K _{i_c} connected in series with the positive electrode of the corresponding battery cell P _i, and a fifth controllable switch K _{i_d} connected in series with the negative electrode of the corresponding battery cell P _i.

In this embodiment, the charging control unit 210 controls the secondary switch unit K _2i-2 with the structure shown in fig. 4, and the specific control manner is as follows: in the case that the cell voltage V _i of the battery cell P _i is not less than the first voltage threshold V _set1, that is, in the case that the battery cell P _i needs to be connected to the secondary charging circuit, the charging control unit 210 controls the fourth controllable switch and the fifth controllable switch to be closed by sending a control signal to the secondary switch unit K _2i-2, and the battery cell P _i is connected to the secondary charging circuit and is charged by the smaller charging current I _{i_4}; in the case where the battery unit P _i needs to be disconnected from the secondary charging circuit, the charging control unit 210 may send a control signal to the secondary switch unit K _2i-2 to control the fourth controllable switch and the fifth controllable switch to be both closed and opened, so that the battery unit P _i may be disconnected from the secondary charging circuit.

In the charge control circuit provided in the embodiments of the present disclosure, the secondary charging circuits may include one or more groups, only one group of secondary charging circuits 230 is shown in fig. 1, and in an actual application scenario, the number of secondary charging circuits and the specific form of the secondary switching unit therein may 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 loops, and the secondary charging loops employ trickle charging loops, and the corresponding secondary switch units employ secondary switch units K _2i-1 as shown in fig. 3; in another possible implementation, the charging control circuit is configured with only one set of secondary charging loops, and the secondary charging loops use micro-current charging loops, and the corresponding secondary switching units use secondary switching units K _2i-2 as shown in fig. 4.

In yet another possible implementation, the charging control circuit may configure two sets of secondary charging loops simultaneously, a trickle charging loop and a micro-current charging loop, respectively; the secondary switch units in the two groups of secondary charging loops, which are in one-to-one correspondence with the battery units, are trickle switch units and micro-current switch units respectively. The control flow for performing charging control on each battery unit in the controlled battery pack based on the charging control circuit may include:

For a first battery unit with the unit voltage smaller than a first voltage threshold V _set1, controlling a main switch unit corresponding to the first battery unit to be conducted, a trickle switch unit to be disconnected and a micro-current switch unit to be disconnected, so that the first battery unit is connected into the main charging loop, and charging is performed through larger main current;

For a second battery unit with the unit voltage not smaller than the first voltage threshold V _set1 but smaller than the second voltage threshold V _set2, controlling the trickle switch unit corresponding to the second battery unit to be on, the main switch unit to be off, and the micro-current switch unit to be off, so that the second battery unit is connected into the trickle charging loop and is charged through smaller trickle current;

And for a third battery unit with the unit voltage not smaller than the second voltage threshold V _set2, controlling a micro-current switch unit corresponding to the third battery unit to be on, a main switch unit to be off, and a trickle switch unit to be off, so that the third battery unit is connected into the micro-current charging loop, and charging is performed through micro-current smaller than the trickle until the battery unit is full, namely the upper limit V _max of the unit voltage of the battery unit is reached.

It can be appreciated that the specific values of the first voltage threshold V _set1 and the second voltage threshold V _set2,V_set2 that are smaller than the cell voltage upper limits V _max;V_set1、V_set2 and V _max of the battery cells may be set according to the actual application scenario, which is not limited in this embodiment.

Therefore, based on the 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 units in the controlled battery pack, that is, the charging circuit type of each battery unit is switched according to the unit voltage of each battery unit, the charging process of each battery unit in the controlled battery pack can be independently controlled, the battery unit with high unit voltage is charged by adopting the charging circuit with smaller charging current, the voltage difference between different battery units is prevented from being too large, the battery units are balanced in electric quantity in time, and the electric quantity balancing efficiency and effect are improved.

Fig. 5 shows a schematic configuration of a charge control circuit having two sets of secondary charge loops. Referring to fig. 5, the charging control circuit includes a main charging circuit 220, and two sets of trickle charging circuits 231 and micro-current charging circuits 232; the secondary switch unit in the trickle charge circuit 231 adopts the secondary switch unit K _2i-1 shown in fig. 3, the secondary switch unit in the micro-current charge circuit 232 adopts the secondary switch unit K _2i-2 shown in fig. 4, and the primary switch unit in the primary charge circuit adopts the primary switch unit K _1i shown in fig. 2 (i is the serial number of the battery unit and the value range is 1-n).

As shown in fig. 5, taking the battery cell P ₁ (i.e., i=1) as an example, the main switch unit K ₁₁ corresponding to P ₁ in the main charging circuit includes three controllable switches K _{1_a}、K_{1_b} and K _{1_c}; in the trickle charge loop, the trickle switch unit K _21-1 corresponding to P 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 loop, the micro-current switching unit K _21-2 corresponding to P ₁ includes two controllable switches K _{1_d} and K _{1_e}; the structure of each of the switch units corresponding to the other battery cells P ₂～P_n is similar to P ₁ and will not be described here. The control ends of each controllable unit, the transistor and the variable resistor in the charging control circuit are respectively connected with the charging control unit, respond to the control signals sent by the charging control unit, and realize the connection and disconnection of the corresponding switch unit.

Based on the charge control circuit shown in fig. 5, taking the battery cell P ₁ as an example, the charge control flow of any battery cell of the charge control unit 210 will be described in detail:

In the whole charging process, circularly collecting the cell voltage V ₁ of the battery cell P ₁ and determining the range of the cell voltage V ₁;

In the case that V ₁ does not reach the first voltage threshold V _set1, i.e., V ₁＜V_set1, the main switch unit K ₁₁ is controlled to be turned on, i.e., the controllable switch K _{1_a}、K_{1_b} in the main switch unit K ₁₁ is controlled to be turned on, the K _{1_c} is controlled to be turned off, and the trickle switch unit K _21-1 and the micro current switch unit K _21-2 are controlled to be turned off, i.e., the transistor Q _{1_1}、Q_{1_2} in the trickle switch unit K _21-1 is controlled to be turned off, and the controllable switches K _{1_d} and K _{1_e} in the micro current switch unit K _21-2 are controlled to be turned off, so that the battery unit P ₁ is connected to the main charging loop 220 and charged by the larger charging current I ₁, so that the unit voltage V ₁ of the battery unit P ₁ is gradually increased;

At V ₁, the first voltage threshold V _set1 is reached, and V ₁ does not reach the second voltage threshold V _set2, I.e., V _set1≤V₁＜V_set2, the main switch unit K ₁₁ is controlled to be turned off, i.e., the controllable switch K _{1_a}、K_{1_b} in the main switch unit K ₁₁ is controlled to be turned off, K _{1_c} is closed, while controlling the trickle switch unit K _21-1 to be on, i.e. controlling the transistor Q _{1_1}、Q_{1_2} in the trickle switch unit K _21-1 to be on, and keeps the micro-current switching unit K _21-2 off, i.e. keeps the controllable switches K _{1_d} and K _{1_e} in the micro-current switching unit K _21-2 off, This disconnects the battery cell P ₁ from the main charging loop 220, switches into the trickle charging loop 231, and charges with a smaller charging current I _{1_2}, causing the cell voltage V ₁ of the battery cell P ₁ to continue to rise; In case V ₁ reaches the second voltage threshold V _set2, i.e. V ₁≥V_set2, the main switching unit K ₁₁ is kept open, At the same time, the trickle switch unit K _21-1 is controlled to be turned off, namely the transistor Q _{1_1}、Q_{1_2} in the trickle switch unit K _21-1 is controlled to be turned off, the micro-current switch unit K _21-2 is controlled to be turned on, i.e., the controllable switches K _{1_d} and K _{1_e} in the micro-current switching unit K _21-2 are controlled to conduct, which causes the battery unit P ₁ to be disconnected from the trickle charge loop 231, In turn, is connected into the microcurrent charging loop 232 and charged by a smaller charging current I _21-2 until full, i.e., the cell voltage V ₁ of the battery cell P ₁ reaches the upper cell voltage limit V _max.

In addition, in the case of V _set1≤V₁＜V_set2, the charging control unit 210 may also control the transistor Q _{1_3} in the trickle switch unit K _21-1 to be turned on, collect the currents I _21-1、I_1-1 and I _1-2 of the corresponding branches in the trickle charging loop through devices such as the ammeter a ₁、A₁₁、A₁₂, and adjust the resistance values of the two variable resistors R _{1_1} and R _{1_2} according to the current collected, so as to precisely control the charging current I _{1_2}, and thus precisely control the charging speed of the battery unit P ₁.

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.

It should be noted that, the charging current I _21-2 of the micro-current charging circuit is smaller than the charging current I _{1_2} of the trickle charging circuit, but the specific current value thereof may be controlled according to the actual application requirement, which is not particularly limited in this embodiment.

In an alternative embodiment of the present disclosure, a loop switch K _s may be further disposed in the main circuit of the trickle charging loop, as shown in fig. 5, and the charging control unit 210 controls the loop switch K _s to be turned off, so that each battery unit may be simultaneously separated from the trickle charging loop, and the control effect is equivalent to that of simultaneously turning off the trickle switch units corresponding to each battery unit one by one. In a practical application scenario, when each battery unit is full, the loop switch K _s may be turned off to disconnect the whole trickle charge loop, so that the control manner of the loop switch K _s is simpler and faster than the manner of turning off each trickle switch unit one by one.

In an alternative embodiment of the present disclosure, in the charging control circuit shown in fig. 5, in the micro-current charging circuit, a filter may be further disposed in parallel branches corresponding to each battery unit one by one, and the filter F ₁、F₂、……、F_n shown in fig. 5 and connected in series with each fourth controllable switch K _{1_d}、K_{2_d}、……、K_{n_d} is used for filtering micro-current, that is, charging current I _21-2、I_22-2、……、I_2n-2, of the corresponding parallel branch, so as to eliminate influence of surrounding noise and other mediums on the micro-current, and realize accurate control on the micro-current charging process.

In an alternative embodiment of the present disclosure, the charging control circuit shown in fig. 5, the main charging circuit 220 may also be connected in series with the safety circuit 221. The safety circuit 221 may include two parallel branches, one including the third variable resistor R _s and the fourth transistor Q _s1 connected in series, and the other including the fifth transistor Q _s2.

As can be seen from the foregoing description of the charging control flow in the foregoing embodiment, as the charging process proceeds, the cell voltage of more and more battery cells reaches or even exceeds the first voltage threshold V _set1 and is separated from the main charging circuit, so that the load in series in the main charging circuit gradually decreases, and the main charging current I ₁ gradually increases. If I ₁ is too large, such as exceeding the maximum charge current that the cells in the battery cells can withstand, it can cause the cells of the battery cells that are still in the main charge loop to heat up and even damage the cells.

In view of this, in order to reduce the heat generated by the battery cell and avoid the damage of the battery cell, in the charge control circuit provided in the embodiment of the disclosure, the current I ₁ in the main charge loop is controlled by the safety circuit 221, and a specific control process may include: when charging is started, the charging control unit 210 may control the fifth transistor Q _s2 in the safety circuit 221 to be closed and the fourth transistor Q _s1 to be opened, that is, when the battery unit is separated from the main charging circuit 220, the charging control unit 210 controls the fifth transistor Q _s2 in the safety circuit 221 to be opened and the fourth transistor Q _s1 to be closed, so that the third variable resistor R _s in the safety circuit 221 is connected to the main charging circuit 220 to supplement the reduction of the load of the main charging circuit caused by the separation of the battery unit; the charging control unit 210 can also control the resistance value of R _s, so as to realize accurate control of the load size in the main charging circuit 220, that is, to realize accurate control of the main charging current I ₁, so that the main charging current I ₁ is always in a safe range.

In another alternative embodiment, the safety circuit 221 may include only the third variable resistor R _s and the fourth transistor Q _s1, and the control effect equivalent to the "fifth transistor Q _s2 is turned on and the fourth transistor Q _s1 is turned off" may be achieved by adjusting the resistance value of the third variable resistor R _s to 0. Of course, other elements and structures may be used for the safety circuit for controlling the current level of the main charging circuit, and other forms of safety circuits may be provided in the charging control circuit without inventive effort, which is also within the scope of the embodiments of the present disclosure.

All the above optional technical solutions may be combined arbitrarily to form an optional embodiment of the present disclosure, which is not described here in detail.

Based on the same conception, the embodiment of the disclosure also provides a charging control method which is applied to the charging control circuit, and is particularly applied to the charging control unit in the charging control circuit. Because the principle of the problem solved by the charge control method is similar to that of the charge control circuit, the charge control method embodiment can be referred to with the implementation of the charge control circuit, and the repetition is omitted.

Based on the charge control circuit shown in fig. 1, the charge control unit 210 controls the on-off states of the main switch unit and the sub switch unit, thereby implementing charge control on each battery unit P ₁～P_n in the controlled battery pack. Fig. 6 is a flowchart of a charging control method applied to the charging control unit 210 according to an embodiment of the present disclosure. Referring to fig. 6, the charge control method includes the steps of:

Step S1, obtaining unit voltages of all battery units in a controlled battery pack, and comparing the unit voltages with a first voltage threshold V _set1 respectively;

Step S2, for a first battery cell whose cell voltage is less than the first voltage threshold V _set1, controlling a main switch unit corresponding to the first battery cell in the charging control circuit to be turned on and a sub switch unit to be turned off, so that the first battery cell is connected to a main charging loop of the charging control circuit, and charging is performed by a larger main current;

step S3, for a second battery cell whose cell voltage is not less than the first voltage threshold V _set1, controlling a secondary switch unit corresponding to the second battery cell in the charging control circuit to be turned on and a primary switch unit to be turned off, so that the second battery cell is connected to a secondary charging loop of the charging control circuit, and charging is performed by a smaller secondary current;

Step S4, judging whether the cell voltage of each battery cell reaches the upper cell voltage limit V _max, if so, executing step S5, otherwise, returning to step S1;

And S5, all the switch units in all the charging loops are disconnected, and the charging process is finished.

In an alternative embodiment of the present disclosure, the charging control circuit may include two sets of secondary charging loops, as shown in fig. 5, which are trickle charging loops and micro-current charging loops, respectively; in view of this, in step S3 of the above-described charge control method, for the second battery cell whose cell voltage is not less than V _set1, the following control operation is performed:

Step S31, comparing the cell voltage of the second battery cell with a second voltage threshold V _set2;

Step S32, for a third battery unit with the unit voltage smaller than V _set2 in the second battery unit, controlling a trickle switch unit corresponding to the third battery unit in the charging control circuit to be conducted, and controlling a main switch unit and a micro-current switch unit to be disconnected so that the third battery unit is connected into the trickle charging loop and is charged by a trickle current smaller than the main current;

And step S33, for a fourth battery unit with the unit voltage not smaller than V _set2 in the second battery unit, controlling a micro-current switch unit corresponding to the fourth battery unit in the charging control circuit to be on, and controlling a main switch unit and a trickle switch unit to be off so that the fourth battery unit is connected into the micro-current charging loop and is charged by micro-current smaller than the trickle current.

According to the control method, based on three groups of charging loops in the charging control circuit, namely the main charging loop, the trickle charging loop and the micro-current charging loop, according to the unit voltage of the battery unit, in the charging process, the charging states of the battery unit are at most three, namely the main current charging state corresponding to the first battery unit, the trickle charging state corresponding to the third battery unit and the micro-current charging state corresponding to the fourth battery unit, the battery units with different unit voltages can be in different charging states, and charging is performed by adopting charging currents with different magnitudes, so that the charging speeds of different battery units can be controlled, and the electric quantity difference among different battery units can be coordinated and controlled, so that electric quantity balance is realized.

In an optional embodiment of the disclosure, the above charging control method further includes:

When any battery unit is connected into the trickle charge loop, the resistance value of the first variable resistor and/or the second variable resistor in the corresponding trickle switch unit is adjusted so as to adjust the trickle charge current corresponding to the battery unit.

In this way, precise control of the trickle charge current may be achieved.

In an alternative embodiment of the present disclosure, a safety circuit is further connected in series in the main charging loop of the charging control circuit; correspondingly, the charging control method further comprises the following steps:

and adjusting the resistance value of the variable resistor in the safety circuit.

Optionally, the resistance value of the variable resistor in the safety circuit can be adjusted according to the number of the battery cells connected in the main charging circuit, that is, the resistance value of the variable resistor in the safety circuit is controlled to be increased along with the decrease of the battery cells connected in the main charging circuit; the resistance value of the variable resistor in the safety circuit can be regulated according to the current of the main charging circuit, namely the main charging current, namely when the main charging current is increased, the resistance value of the variable resistor in the safety circuit is controlled to be increased, so that the main charging current is reduced, and the situation that the main charging current exceeds the maximum charging current bearable by the battery cell is avoided.

In this embodiment, the load of the whole main charging circuit is adjusted by controlling the resistance value of the safety circuit, so that the load reduction caused by the separation of the battery unit from the main charging circuit is compensated, the current of the main charging circuit is ensured to be always in a safety range, and the damage of the battery core of the battery unit connected to the main charging circuit due to overlarge current is avoided.

Based on the same concept, the embodiments of the present disclosure also provide a charge control device that can be applied to the charge control circuit described in the foregoing embodiments, for example, as the charge control unit 210 therein;

The charge control device may specifically include:

In an alternative embodiment of the present disclosure, the charging control circuit may include two sets of secondary charging loops, namely a trickle charging loop and a micro-current charging loop; in view of this, the second control module in the above-mentioned charging control device may specifically include:

In an optional embodiment of the disclosure, the charging control device further includes:

And the trickle control module is used for adjusting the resistance value of the first variable resistor and/or the second variable resistor in the corresponding trickle switch unit when any battery unit is connected into the trickle charging loop so as to adjust the trickle charging current corresponding to the battery unit.

In an alternative embodiment of the present disclosure, the charging control circuit may further include a safety circuit 221 as described in the foregoing embodiment, where the charging control device further includes:

And the safety control module is used for adjusting the resistance value of the variable resistor in the safety circuit so as to control the current in the main charging loop and prevent the current from exceeding the maximum charging current bearable by the battery cell.

Based on the same conception, the embodiment of the disclosure also provides a battery system, which can be an energy storage battery in the scenes of photovoltaic power generation, wind power generation and the like, and can also be a power battery applied to the scenes of electric automobiles, electric bicycles and the like.

The above battery system may include: a battery pack having a plurality of battery cells, and a charge control circuit that controls charging of each of the battery cells in the battery pack; the charging control circuit may be any of the charging control circuits described in the foregoing embodiments, and is configured to switch the charging loop corresponding to each battery cell according to the cell voltage of the battery cell. Like this for the battery cell that the unit voltage is lower can carry out quick charge through the great main charging circuit of charge current, and the battery cell that the unit voltage is higher can carry out slow charge through the less secondary charging circuit of charge current to realize the coordinated control to different battery cell electric quantity, realize the electric quantity balanced, avoid the electric quantity difference too big, improve the performance of group battery.

Referring to fig. 7, fig. 7 is a block diagram of an electronic device according to one or more embodiments of the present disclosure. As shown in fig. 7, the electronic device 500 may include a processor 501 and a memory 502; memory 502 may be coupled to processor 501. Notably, this fig. 7 is exemplary; other types of structures may also be used in addition to or in place of the structures to implement telecommunications functions or other functions. Alternatively, the electronic device 500 may be a management device of a battery system.

In a possible implementation, the relevant functions of the charge control unit 210 described above may be integrated into the processor 501. Wherein the processor 501 may be configured to:

Furthermore, in some alternative implementations, the electronic device 500 may further include: communication module, input unit, audio processor, display, power etc.. It is noted that the electronic device 500 need not include all of the components shown in fig. 7; in addition, the electronic device 500 may further include components not shown in fig. 7, to which reference is made to the related art.

In some alternative implementations, the processor 501, also sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, with the processor 501 receiving inputs and controlling the operation of the various components of the electronic device 500.

The memory 502 may be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The above information about the battery management system may be stored, and a program for executing the information may be stored. And the processor 501 can execute the program stored in the memory 502 to realize information storage or processing, etc.

The input unit may provide input to the processor 501. The input unit is for example a key or a touch input device. The power source may be used to provide power to the electronic device 500. The display can be used for displaying display objects such as images and characters. The display may be, for example, but not limited to, an LCD display.

The memory 502 may be a solid state memory such as Read Only Memory (ROM), random Access Memory (RAM), SIM card, and the like. But also a memory which holds information even when powered down, can be selectively erased and provided with further data, an example of which is sometimes referred to as EPROM or the like. Memory 502 may also be some other type of device. Memory 502 includes a buffer memory (sometimes referred to as a buffer). The memory 502 may include an application/function storage for storing application programs and function programs or a flow chart for executing operations of the electronic device 500 by the processor 501.

Memory 502 may also include a data store for storing data, such as contacts, digital data, pictures, sounds, and/or any other data used by an electronic device. The driver store of memory 502 may include various drivers for the computer device for communication functions and/or for performing other functions of the computer device (e.g., messaging applications, address book applications, etc.).

The embodiment of the present disclosure further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the foregoing embodiment of the charging control method, and can achieve the same technical effects, so that repetition is avoided, and no further description is provided herein.

The processor is a processor in the electronic device in the above embodiment. Readable storage media include computer readable storage media such as Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic or optical disks, and the like.

The embodiment of the disclosure further provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction, implement each step of the foregoing method embodiment, and achieve the same technical effect, so that repetition is avoided, and no further description is given here.

It should be understood that the chips referred to in the embodiments of the present disclosure may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.

The disclosed embodiments further provide a computer program product comprising: and when the computer program or the instructions run on the computer, the computer realizes the steps of the method embodiment and can achieve the same technical effects, and in order to avoid repetition, the description is omitted here.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for apparatus and system embodiments, the description is relatively simple, as it is substantially similar to method embodiments, with reference to the description of method embodiments in part.

Although one or more embodiments of the present description provide method operational steps as described in the embodiments or flowcharts, more or fewer operational steps may be included based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. When implemented by an actual device or client product, the instructions may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment) as shown in the embodiments or figures.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. are directions or positional relationships based on the operation state of the present application are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, unless otherwise specifically defined and limited. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

The application has been described above in connection with preferred embodiments, which are, however, exemplary only and for illustrative purposes. On this basis, the application can be subjected to various substitutions and improvements, and all fall within the protection scope of the application.

Claims

1. A charge control circuit, characterized by comprising: the charging control unit, the main charging loop and at least one group of secondary charging loops;

2. The charge control circuit of claim 1, wherein the main switch unit comprises:

3. The charge control circuit of claim 1, wherein the secondary charging loop comprises a trickle charging loop;

the trickle switch unit includes:

4. The charge control circuit of claim 3 wherein the secondary charging loop further comprises a microcurrent charging loop; the charging current of the micro-current charging loop is smaller than the charging current of the trickle charging loop;

the micro-current switching unit includes:

5. The charge control circuit of claim 4 wherein said charge control unit is configured to, for a second battery cell having said cell voltage not less than said first voltage threshold,

wherein the first voltage threshold is less than the second voltage threshold.

6. The charge control circuit of claim 1, further comprising a safety circuit in the main charge circuit for regulating the main charge current under control of the charge control unit;

7. A charging control method, characterized by being applied to a charging control circuit;

The method comprises the following steps:

8. The charge control method of claim 7, wherein the secondary charging loops in the charge control circuit comprise two groups, a trickle charge loop and a micro-current charge loop, respectively;

9. A charge control device, characterized by being applied to a charge control circuit;

the charge control device includes:

10. A battery system, comprising: a battery pack, and a charge control circuit as claimed in any one of claims 1 to 6.

11. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, carries out the steps of the method according to any one of claims 7 to 8.

12. An electronic device, comprising:

A memory having a computer program stored thereon;

A processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 7 to 8.