阅读说明：本技术 串联电源组的充电均衡电路、充电均衡方法和车辆 (Charge equalization circuit and charge equalization method of series power supply pack and vehicle ) 是由 梅俊华 李志威 黄后增 张俊 胡辉 曹福昂 于 2021-09-17 设计创作，主要内容包括：本申请实施例提供一种串联电源组的充电均衡电路、充电均衡方法和车辆,所述充电均衡电路包括,至少两个相互串联的电源组和控制单元；每个所述电源组包括,电源和调节电路,所述调节电路与所述电源并联设置,且所述调节电路与所述控制单元连接,相邻两个所述调节电路之间的第一公共端与相邻两个电源之间的第二公共端连接；当检测到充电时任意一电源的电量与充满状态电量之间的差值小于预设电量阈值时,所述控制单元用于控制所述调节电路调节串联电源组之间的均衡充电过程。本申请实施例可以避免动力电源过充,同时提供其他动力电源组充电的电流路径。(The embodiment of the application provides a charge equalization circuit, a charge equalization method and a vehicle of a series power supply pack, wherein the charge equalization circuit comprises at least two power supply packs and a control unit which are connected in series; each power supply set comprises a power supply and an adjusting circuit, the adjusting circuits are connected with the power supplies in parallel and connected with the control unit, and a first common end between every two adjacent adjusting circuits is connected with a second common end between every two adjacent power supplies; when the difference value between the electric quantity of any power supply and the electric quantity in the full-charge state is smaller than the preset electric quantity threshold value during charging, the control unit is used for controlling the adjusting circuit to adjust the equalizing charging process between the series power supply sets. The embodiment of the application can avoid the overcharge of the power supply and provide current paths for charging other power supply groups.)

1. A charge equalization circuit of a series power supply pack comprises at least two power supply packs and a control unit which are connected in series;

each power supply set comprises a power supply and an adjusting circuit, the adjusting circuits are connected with the power supplies in parallel and connected with the control unit, and a first common end between every two adjacent adjusting circuits is connected with a second common end between every two adjacent power supplies;

when the difference value between the electric quantity of any power supply and the electric quantity in the full-charge state is smaller than the preset electric quantity threshold value during charging, the control unit is used for controlling the adjusting circuit to adjust the equalizing charging process between the series power supply sets.

2. The charge equalization circuit of claim 1, wherein said regulation circuit comprises a regulation current unit and a current collection unit;

the current regulating unit is connected with the current collecting unit in series, and the output end of the current collecting unit is connected with the input end of the current regulating unit;

the current acquisition unit is used for acquiring the current flowing through the current regulation unit;

and the control unit is used for controlling the current adjusting unit to adjust the equalizing charge process between the series power supply sets according to the current acquired by the current acquisition unit.

3. The charge equalization circuit of claim 2, wherein said regulation circuit further comprises, an amplification circuit;

the amplifying circuits are arranged in one-to-one correspondence with the current acquisition units, and the amplifying circuits are respectively connected with two ends of the current acquisition units and used for amplifying the current flowing through the current acquisition units.

4. The charge equalization circuit of claim 2, wherein said regulation circuit further comprises, a comparison circuit;

the comparison circuits are arranged in one-to-one correspondence with the current regulating units, the input ends of the comparison circuits are connected with the output ends of the amplifying circuits, and the output ends of the comparison circuits are connected with the current regulating units;

the comparison circuit is used for comparing the current amplified by the amplification circuit with a preset current;

and the control unit is used for controlling the current regulating unit to regulate the equalizing charge process among the series power supply groups according to the comparison result.

5. The charge equalization circuit of any of claims 2-4, wherein the regulation circuit further comprises, a first load and a second load;

one end of the first load is connected with one end of the current acquisition unit, and the other end of the first load is connected with the positive input end of the amplification circuit;

one end of the second load is connected with the other end of the current acquisition unit, and the other end of the second load is connected with the negative input end of the amplifying circuit.

6. The charge equalization circuit of claim 5, wherein said conditioning circuit further comprises, a filter circuit;

the filter circuit is connected in parallel with the current acquisition unit, and one end of the filter circuit is arranged between the first load and the positive input end of the amplification circuit;

the other end of the filter circuit is arranged between the second load and the negative input end of the amplifying circuit.

7. The charge equalization circuit of claim 5, wherein said power pack further comprises, a diode;

the diodes are in one-to-one correspondence with the power supplies and are arranged in parallel, and two ends of each diode are respectively connected with two poles of the power supplies.

8. The charge equalization circuit of claim 1, wherein said regulating circuit unit is a switch.

9. A method of charge equalization for a series power pack, the method being performed by a charge equalization circuit as claimed in any one of claims 1 to 8, the method comprising,

acquiring the electric quantity of any power supply in the charging process of the series power supply group;

and when the difference value between the electric quantity of any power supply and the full-charge state electric quantity is smaller than a preset electric quantity threshold value during charging, controlling the regulating circuit to regulate the equalizing charging process between the series power supply groups.

10. A vehicle provided with a charge equalization circuit as claimed in any one of claims 1 to 8.

Technical Field

The embodiment of the application relates to the technical field of charging based on a vehicle power supply, in particular to a charging equalization circuit, a charging equalization method and a vehicle of a series power supply set.

Background

With the popularization of electric motorcycles, the demand for high power is more and more pursued, and a mode of directly connecting a plurality of groups of power supplies in series is generally adopted to achieve low-loss high-power output for improving efficiency, but the problem of inconsistent performance of the power supplies exists, so that the vehicle on-line charging can face the situation that the charging cannot be completely full.

Disclosure of Invention

An object of the embodiment of the application is to provide a charge equalization circuit, charge equalization method and vehicle of series connection power supply group, when being furnished with the online charging of vehicle that multiunit power supply established ties, when confirming the difference between the electric quantity of arbitrary two powers and surpassing and predetermineeing the threshold value, open regulating circuit, the control unit is through control regulating circuit adjusts the equalizing charge process between the series connection power supply group to avoid this group power supply overcharge, provide the current path that other power supply group charged simultaneously, and then realized that the online charging of power supply group can reach full charge state completely.

In particular, in a first aspect, the embodiment of the present application provides a charge equalization circuit for a series power supply pack, where the charge equalization circuit includes at least two power supply packs and a control unit, which are connected in series with each other;

each power supply set comprises a power supply and an adjusting circuit, the adjusting circuits are connected with the power supplies in parallel and connected with the control unit, and a first common end between every two adjacent adjusting circuits is connected with a second common end between every two adjacent power supplies;

when the difference value between the electric quantity of any power supply and the electric quantity in the full-charge state is smaller than the preset electric quantity threshold value during charging, the control unit controls the adjusting circuit to adjust the equalizing charging process between the series power supply sets.

Compared with the prior art, this application embodiment is through setting up regulating circuit, when being furnished with the vehicle that the multiunit power supply established ties on line charging, when detecting the difference between the electric quantity of arbitrary power and the full charge state electric quantity when charging, opens regulating circuit, and the control unit is through control regulating circuit adjusts the equalizing charge process between the series connection power supply package to avoid this group power supply overcharge, provide the current path that other power supply group charged simultaneously, and then realized that the online charging of power supply group can reach the complete full charge state.

In one embodiment, the adjusting circuit comprises an adjusting current unit and a current collecting unit;

the current regulating unit is connected with the current collecting unit in series, and the output end of the current collecting unit is connected with the input end of the current regulating unit;

the current acquisition unit is used for acquiring the current flowing through the current adjustment unit, and the control unit controls the current adjustment unit to adjust the equalizing charge process between the series power supply sets according to the current acquired by the current acquisition unit.

In one embodiment, the regulating circuit further comprises an amplifying circuit;

the amplifying circuits are arranged in one-to-one correspondence with the current acquisition units, and the amplifying circuits are respectively connected with two ends of the current acquisition units and used for amplifying the current flowing through the current acquisition units.

In one embodiment, the adjusting circuit further comprises a comparing circuit;

the comparison circuits are arranged in one-to-one correspondence with the current regulating units, the input ends of the comparison circuits are connected with the output ends of the amplifying circuits, and the output ends of the comparison circuits are connected with the current regulating units;

the comparison circuit is used for comparing the current amplified by the amplification circuit with a preset current, and the control unit controls the current adjusting unit to adjust the equalizing charge process between the series power supply sets according to the comparison result.

In one embodiment, the regulating circuit further comprises a first load and a second load;

one end of the first load is connected with one end of the current acquisition unit, and the other end of the first load is connected with the positive input end of the amplification circuit;

one end of the second load is connected with the other end of the current acquisition unit, and the other end of the second load is connected with the negative input end of the amplifying circuit.

In one embodiment, the conditioning circuit further comprises a filtering circuit;

the filter circuit is connected in parallel with the current acquisition unit, and one end of the filter circuit is arranged between the first load and the positive input end of the amplification circuit;

the other end of the filter circuit is arranged between the second load and the negative input end of the amplifying circuit.

In one embodiment, the power pack further comprises, a diode;

the diodes are in one-to-one correspondence with the power supplies and are arranged in parallel, and two ends of each diode are respectively connected with two poles of the power supplies.

In one embodiment, the adjusting circuit unit is a switch.

In a second aspect, the present application further provides a charge equalization method for a series power supply pack, where the method is performed by any one of the charge equalization circuits in the first aspect, and the method includes,

acquiring the electric quantity of any two power supplies in the charging process of the series power supply set;

and when the difference value between the electric quantity of any power supply and the full-charge state electric quantity is smaller than a preset electric quantity threshold value during charging, controlling the regulating circuit to regulate the equalizing charging process between the series power supply groups.

In a third aspect, an embodiment of the present application further provides a vehicle, where the vehicle is provided with the charge equalization circuit described in any one of the first aspects.

Drawings

Non-limiting and non-exhaustive embodiments of the present application are described, by way of example, with reference to the following drawings, in which:

FIG. 1 illustrates a schematic diagram of a charge equalization circuit for a series power pack, according to an embodiment of the present application;

FIG. 2 illustrates a schematic diagram of a charge equalization circuit for a series power pack, according to an embodiment of the present application;

FIG. 3 illustrates a schematic diagram of a charge equalization circuit for a series power pack, according to an embodiment of the present application;

fig. 4 shows a flow diagram of a method of charge equalization for a series power pack according to yet another embodiment of the present application.

Detailed Description

In order to make the above and other features and advantages of the present application more apparent, the present application is further described below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limiting, for those of ordinary skill in the art.

In order to make those skilled in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

When the multiple groups of power supplies in the conventional power supply set obtain larger energy output in a series connection mode, a problem occurs, namely when the multiple groups of power supplies are charged, because the charging speed of each group of power supplies is different, when one group of power supplies is fully charged and the charging path is disconnected, the other group of power supplies also stops charging, so that the group of power supplies does not reach a full-charge state, and the electric quantity supplemented by the group of power supplies which are not fully charged all the time is less and less due to the cyclic accumulation. Because the actual discharged electric quantity of the series power supplies is limited to the weakest power supply group, the whole power supply group can discharge less and less electric quantity.

This application can adopt digital control's mode, also can adopt the mode that pure hardware set for to two sets of power supply establish ties as the example, when the vehicle detects the charger and inserts, vehicle power management system can real time monitoring power supply's charged state, when detecting the difference between the electric quantity of arbitrary power and the full charge state electric quantity when charging and be less than when predetermineeing the electric quantity threshold value, control regulating circuit adjusts the equalizing charge process between the series connection power supply group.

Example 1

Referring to fig. 1, fig. 1 is a schematic diagram illustrating a charge equalization circuit of a series power pack according to an embodiment of the present application, where the charge equalization circuit includes two power packs connected in series with each other and a control unit 01; the circuit comprises a power supply BAT1 and an adjusting circuit Q1, the adjusting circuit Q1 is connected with the power supply BAT1 in parallel, the other power supply pack comprises a power supply BAT2 and an adjusting circuit Q2, the adjusting circuit Q2 is connected with the power supply BAT2 in parallel, the adjusting circuits Q1 and Q2 are connected with the control unit 01 respectively, a first common end between every two adjacent adjusting circuits Q1 and Q3 is connected with a second common end between every two adjacent power supplies BAT1 and BAT2, and the control unit 01 controls the adjusting circuit Q1 or Q2 to adjust the charging process between the series-connected power supply packs in an equalizing mode when the difference between the electric quantity and the full-state electric quantity is smaller than a preset electric quantity threshold value when the difference value between the electric quantity of any one power supply BAT1 and the battery 2 during charging is detected.

Assuming that one of the power supply group BAT1 is connected to a charger (not shown), in this embodiment, the charger is a charger capable of intelligently adjusting an output voltage, the adjusting circuit is a switch, the switch is a MOS transistor, an anode of the power supply BAT1 is connected to a drain of the MOS transistor Q1, a gate of the MOS transistor Q1 is connected to the control unit 01, and a cathode of the power supply BAT1 is connected to a source of the MOS transistor Q1; the positive electrode of the power supply BAT2 is connected with the drain electrode of the MOS tube Q2, the gate electrode of the MOS tube Q2 is connected with the control unit 01, the negative electrode of the power supply BAT1 is connected with the source electrode of the MOS tube Q2, in the process of charging the series power supply pack, when the control unit 01 of the vehicle power supply management system detects that the difference value between the electric quantity and the full-charge state electric quantity of any one power supply BAT1 or BAT2 is smaller than a preset electric quantity threshold value when charging is performed, and if the difference value between the BAT1 and the full-charge state electric quantity is smaller than the preset electric quantity threshold value, the charge equalization process is realized through the charge equalization circuit shown in FIG. 1, the output of the power supply BAT1 is turned off, the MOS tube Q1 is turned off, the charger adjusts the output voltage to the charging voltage range of the single-group power supply, at the MOS tube Q1 is turned on, a charging current path of the power supply BAT2 is provided, and the state from the power supply BAT2 to the full-charge state is achieved. Similarly, if the difference between the BAT2 and the full-charge state electric quantity is smaller than the preset electric quantity threshold, the charge equalization circuit shown in fig. 1 is used to implement the charge equalization process, the output of the BAT2 power supply is turned off, the MOS transistor Q2 charger is turned off to adjust the output voltage to the charge voltage range of the single-group power supply, and at this time, the MOS transistor Q2 can be turned on to provide a charge current path for the BAT1 power supply, so as to achieve the state that the BAT1 is continuously charged until the battery is full-charge.

This application embodiment is through being provided with regulating circuit Q1 and Q2 for when being furnished with the vehicle that the multiunit power supply is established ties on line charging, when the difference between a set of power supply and the full charge state electric quantity is less than when predetermineeing the electric quantity threshold value, open the equalizing charge process that regulating circuit adjusted between the series connection power supply group, in order to avoid this group power supply overcharge, provide the current path that other power supply group charged simultaneously.

Example 2

Referring to fig. 2, fig. 2 shows a schematic diagram of a charge equalization circuit of a series power pack according to another embodiment of the present application. The rest of the components are the same as embodiment 1, but the regulating circuit is different from embodiment 1, in the embodiment of the present application, the regulating circuit corresponding to the power supply BAT1 includes a regulating current unit Q1 and a current collecting unit R1, the regulating current unit Q1 is connected in series with the current collecting unit R1, the output end of the current collecting unit R1 is connected with the input end of the regulating current unit R1, and the current collecting unit R1 is used for collecting the current flowing through the regulating current unit Q1; the control unit 01 is used for controlling the current adjusting unit Q1 to adjust the equalizing charge process between the series power supply groups according to the current collected by the current collecting unit R1.

Similarly, the regulating circuit corresponding to the power supply BAT2 includes a regulating current unit Q2 and a current collecting unit R2, the regulating current unit Q2 is connected in series with the current collecting unit R2, an output end of the current collecting unit R2 is connected with an input end of the regulating current unit R2, and the current collecting unit R2 is configured to collect current flowing through the regulating current unit Q2; the control unit 01 is configured to control the current adjusting unit Q2 to adjust an equalizing charge process between the series power supply sets according to the magnitude of the current acquired by the current acquiring unit R2, where the current acquiring units R1 and R2 in this embodiment are resistors, and may also be current sensors, which is not limited in this application.

The high-power MOS pipe is generally selected for use to regulation current unit Q1 in this application, and the positive pole of power BAT1 is connected with the drain electrode of MOS pipe, and the grid of MOS pipe is connected with current acquisition unit R1's output, and the negative pole of power BAT1 is connected with the source electrode of MOS pipe, and the high-power MOS pipe of this application embodiment is equipped with suitable heat abstractor, is connected to vehicle metal structure, is assisted with the wind channel of vehicle, can the power that more extensive promotion regulation current unit Q1 absorbed.

As shown in fig. 2, the adjusting circuit further includes an amplifying circuit and a comparing circuit, wherein the amplifying circuit and the comparing circuit may be integrated with or separated from the control unit 01, and are not limited thereto, and the present application describes in detail embodiments of the present application in which the amplifying circuit and the comparing circuit may be integrated with the control unit 01, the amplifying circuit and the current collecting unit are disposed in one-to-one correspondence, in this embodiment, the amplifying circuit corresponding to the current collecting unit R1 is U1, the amplifying circuit U1 is connected to two ends of the current collecting unit R1, in this embodiment, a positive input terminal of the amplifying circuit U1 is connected to one end of the current collecting unit R1, a negative input terminal of the amplifying circuit U1 is connected to the other end of the current collecting unit R1, the amplifying circuit U1 is used for amplifying a current signal flowing through the current collecting unit R1, achieving the effects of higher precision and stable control. The comparison circuit U2 and the adjustment current unit Q1 one-to-one correspond to each other and are arranged, the input end of the comparison circuit U2 is connected with the output end of the amplification circuit U1, the output end of the comparison circuit U2 is connected with the adjustment current unit R1, the comparison circuit U2 is used for comparing the current amplified by the amplification circuit U1 with the preset current, and the control unit 01 is used for controlling the adjustment current unit Q1 to adjust the equalizing charge process between the series power supply groups according to the comparison result.

The amplifier circuit that current acquisition unit R2 corresponds is U13, amplifier circuit U3 respectively with current acquisition unit R2's both ends are connected, in this application embodiment, amplifier circuit U3's positive input end with current acquisition unit R3's one end is connected, amplifier circuit U3's negative pole input with current acquisition unit R3's the other end is connected, and amplifier circuit U3 is used for the amplification to flow through current acquisition unit R3's current signal reaches higher precision and stable control's effect. The comparison circuit U4 and the adjustment current unit Q2 one-to-one correspond to each other and are arranged, the input end of the comparison circuit U4 is connected with the output end of the amplification circuit U3, the output end of the comparison circuit U4 is connected with the adjustment current unit R2, the comparison circuit U4 is used for comparing the current amplified by the amplification circuit U3 with the preset current, and the control unit 01 is used for controlling the adjustment current unit Q2 to adjust the equalizing charge process between the series power supply groups according to the comparison result.

In the embodiment of the present application, the amplifying circuit U1 is an amplifier, and the comparing circuit U4 is a comparator.

As shown in fig. 2, the regulating circuit corresponding to the power BAT1 further includes a first load R3 and a second load R4, one end of the first load R3 is connected to one end of the current collecting unit R1, and the other end of the first load R3 is connected to the positive input end of the amplifying circuit U1; one end of the second load R4 is connected with the other end of the current collection unit R1, and the other end of the second load R4 is connected with the negative input end of the amplification unit U1.

The regulating circuit corresponding to the power supply BAT2 further comprises a first load R5 and a second load R6, one end of the first load R5 is connected with one end of the current collecting unit R2, and the other end of the first load R5 is connected with the positive input end of the amplifying circuit U3; one end of the second load R6 is connected to the other end of the current collection unit R2, and the other end of the second load R6 is connected to the negative input end of the amplification unit U3, in this embodiment, the first loads R3 and R5 are resistors, and the second loads R4 and R6 are also resistors.

The regulating circuit corresponding to the power supply BAT1 further comprises a filter circuit C1; the filter circuit C1 is disposed in parallel with the current collecting unit R1, one end of the filter circuit C1 is disposed between the first load R3 and the positive input terminal of the amplifying circuit U1, and the other end of the filter circuit C1 is disposed between the second load R4 and the negative input terminal of the amplifying circuit U1.

The regulating circuit corresponding to the power supply BAT2 further comprises a filter circuit C2; the filter circuit C2 is disposed in parallel with the current collecting unit R2, one end of the filter circuit C2 is disposed between the first load R5 and the positive input terminal of the amplifying circuit U3, and the other end of the filter circuit C2 is disposed between the second load R6 and the negative input terminal of the amplifying circuit U3.

In the embodiment of the present application, the filter circuits C1 and C2 are configured to have a low-pass filtering effect and suppress transient high-frequency pulse interference, and are respectively connected to the first load R3 and the second load R4 at two ends of the filter circuit C1 for suppressing transient high-frequency pulse interference to protect the control unit 01, and are respectively connected to the first load R5 and the second load R6 at two ends of the filter circuit C2 for suppressing transient high-frequency pulse interference to protect the control unit 01. In the embodiment of the present application, the filter circuits C1 and C2 are capacitors.

The regulating circuit corresponding to the power supply BAT1 further comprises a diode D1, the diode D1 is connected with the power supply BAT1 in parallel, two ends of the diode D1 are respectively connected with two poles of the power supply BAT1,

the regulating circuit corresponding to the power supply BAT2 further comprises a diode D2, the diode D2 is connected with the power supply BAT2 in parallel, two ends of the diode D2 are respectively connected with two poles of the power supply BAT2, the diode D1 and the diode D2 play a role in continuous flow, the diode D1 and the diode D2 are used for playing a role in continuous flow for energy stored in parasitic inductance of an external lead when the circuit is abnormal, and the phenomenon of high-voltage sparking is avoided.

In this embodiment, if the charger is used to constantly support charging of the series power pack, also taking the case where the difference between the priority and full state power of the power supply BAT1 is less than the preset power threshold, by collecting the current on the current collecting unit R1, the current collecting unit R1 generally uses a low-impedance sampling resistor, the current signal is amplified by the amplifying circuit U1 to achieve the effects of higher precision and stable control, the output of the comparing circuit U2 is compared with the preset current to output the comparison result, the working state of the regulating current unit Q1 is regulated according to the comparison result, at this time, the regulating current unit Q1 is equivalent to a controlled adjustable resistor, the purpose of absorbing the current of the power supply BAT1 or the charger is achieved, thus the power supply BAT1 is protected from being overcharged, meanwhile, a current path is provided for the continuous charging of the power supply BAT2, and the absorbed current can be simply calculated as I-Iref/Gu/R1; iref is a preset voltage value, Gu is a current amplification gain of the amplifying circuit U1, R1 is a resistance value of the current acquisition unit, and the current flowing through the current acquisition unit R1 can be dynamically set by adjusting the voltage value of Iref, so that the scenes of different performance differences of the series power supply set can be better matched.

When the difference between the electric quantity of the power supply BAT2 and the electric quantity in the full-charge state is preferably smaller than the preset electric quantity threshold, similar to the above scenario, by acquiring the magnitude of the current on the current acquisition unit R2, the current acquisition unit R2 generally selects a low-impedance sampling resistor, amplifies a current signal through the amplification circuit U3, and achieves the effects of higher precision and stable control, the output of the comparison circuit U4 is compared with the preset current, and a comparison result is output, and the working state of the current adjustment unit Q2 is adjusted according to the comparison result, at this time, the current adjustment unit Q2 is equivalent to a controlled adjustable resistor, and the purpose of absorbing the current of the power supply BAT2 or the charger is achieved, so that the power supply BAT2 is protected from being overcharged, a current path is provided for the power supply BAT1 to continue charging, and the absorbed current can be simply calculated as I Iref/Gu/R2; where Iref is a preset voltage value, Gu is a current amplification gain of the amplifying circuit U3, and R2 is a resistance value of the current collecting unit. Through adjusting the voltage value of Iref, can the dynamic setting flow through the electric current on the current acquisition unit R2, can match the scene of the different performance differences of series connection power supply group better, this application embodiment realizes the equalizing charge process between the series connection power supply group through the charging process of restraining the power that is close to full-charge state in advance.

Example 3

Referring to fig. 3, the present application is not limited to two power supply sets connected in series, and three or more power supply sets connected in series are also applicable, and in this embodiment, three power supply sets connected in series are taken as an example to illustrate the technical solution of the present application, and a branch in any one of the power supply sets or a branch between the power supply sets in series is connected to a fixed voltage node.

On the basis of fig. 2, the embodiment of the present application further includes a third power pack BAT3, the third power pack BAT3 is the same in composition as described above, wherein the power supply pack comprises a power supply BAT3 and a regulating circuit, the regulating circuit comprises a regulating current unit Q3, a current acquisition unit R3, an amplifying circuit U5 and a comparing circuit U6, the current regulating unit Q3 is connected in series with the current collecting unit R3, the amplifying circuit corresponding to the current collecting unit R3 is U5, the amplifying circuit U5 is respectively connected with two ends of the current collecting unit R3, in the embodiment of the application, the positive pole input end of the amplifying circuit U3 is connected with one end of the current collecting unit R3, the negative electrode input end of the amplifying circuit U3 is connected with the other end of the current collecting unit R3, and the amplifying circuit U3 is used for amplifying a current signal flowing through the current collecting unit R3, so that the effects of higher precision and stable control are achieved. The comparison circuit U6 and the adjustment current unit Q3 one-to-one correspond to each other and are arranged, the input end of the comparison circuit U6 is connected with the output end of the amplification circuit U5, the output end of the comparison circuit U6 is connected with the adjustment current unit R3, the comparison circuit U6 is used for comparing the current amplified by the amplification circuit U5 with the preset current, and the control unit 01 is used for controlling the adjustment current unit Q3 to adjust the equalizing charge process between the series power supply groups according to the comparison result.

As shown in fig. 3, the regulating circuit corresponding to the power BAT3 further includes a first load R8 and a second load R9, one end of the first load R8 is connected to one end of the current collecting unit R3, and the other end of the first load R8 is connected to the positive input end of the amplifying circuit U5; one end of the second load R9 is connected to the other end of the current collection unit R3, and the other end of the second load R9 is connected to the negative input end of the amplification unit U5, in this embodiment, the first load R8 is a resistor, and the second load R9 is also a resistor.

The regulating circuit corresponding to the power supply BAT3 further comprises a filter circuit C3; the filter circuit C3 is disposed in parallel with the current collecting unit R3, one end of the filter circuit C3 is disposed between the first load R8 and the positive input terminal of the amplifying circuit U5, and the other end of the filter circuit C3 is disposed between the second load R9 and the negative input terminal of the amplifying circuit U5.

In the embodiment of the present application, the filter circuit C3 is configured to have a low-pass filtering effect and suppress short-term high-frequency pulse interference, and is respectively connected to the first load R8 and the second load R9 at two ends of the filter circuit C3 for suppressing short-term high-frequency pulse interference to protect the control unit 01, and is respectively connected to the first load R8 and the second load R8 at two ends of the filter circuit C3 for suppressing short-term high-frequency pulse interference to protect the control unit 01. In the embodiment of the present application, the filter circuit C3 is a capacitor.

The adjusting circuit corresponding to the power supply BAT3 further comprises a diode D3, the diode D3 is connected with the power supply BAT3 in parallel, and two ends of the diode D3 are connected with two poles of the power supply BAT3 respectively.

The diode D3 plays a role of follow current, and is used for playing a role of follow current on energy stored by parasitic inductance of an external lead when the external lead is abnormal, so that the phenomenon of high-voltage ignition is avoided.

In this embodiment, the charger may be connected to any one power supply, and if the charger constantly supports charging of a series power supply set, for example, when the difference between the power supply BAT1 and the power in the fully charged state is smaller than the preset power threshold, by collecting the current of the current collecting unit R1, the current collecting unit R1 generally selects a low-impedance sampling resistor, amplifies the current signal by the amplifying circuit U1, so as to achieve the effect of higher precision and stable control, compares the output of the comparing circuit U2 with the preset current, outputs the comparison result, adjusts the working state of the adjusting current unit Q1 according to the comparison result, and at this time, the adjusting current unit Q1 is equivalent to a controlled adjustable resistor, so as to achieve the purpose of absorbing the current of the power supply BAT1 or the charger, thereby protecting the power supply BAT1 from overcharging, and providing a current path for continuously charging the power supplies BAT2 and BAT3, the current absorbed can be simply calculated as I-Iref/Gu/R1; where Iref is a preset voltage value, Gu is a current amplification gain of the amplifying circuit U1, and R1 is a resistance value of the current collecting unit. The current flowing through the current acquisition unit R1 can be dynamically set by adjusting the voltage value of Iref, the scenes of different performance differences of the series power supply groups can be better matched, the above processes are repeated in the continuous charging process, if the difference value between the full-charge state electric quantity and any one power supply BAR1, BAT2 or BAT3 is smaller than the preset electric quantity threshold value in the charging process, the aim of absorbing the current of the power supplies BAT1, BAT2, BAT3 or the charger can be achieved by adjusting the working state of the corresponding current adjustment unit Q1, Q2 or Q3, so that the power supplies BAT1, BAT2 or BAT3 are protected from being overcharged, and a current path is provided for the continuous charging of other power supplies until all the series power supplies are fully charged, and the equalizing charging process between the series power supplies is realized by inhibiting the charging process of the power supplies which are fully charged in the pre-close state.

In a second aspect, with reference to fig. 4, an embodiment of the present application further provides a charge equalization method for a series power supply pack, where the method is performed by the charge equalization circuit as described above, the method includes,

step S41, acquiring the electric quantity of any power supply in the charging process of the series power supply group;

step S42, judging that the difference value between the electric quantity of any power supply and the electric quantity in the full-charge state is smaller than a preset electric quantity threshold value;

if the value is less than the preset threshold value, step S43 is executed to control the regulating circuit to regulate the series power supply

If not, executing step S44, not turning on the adjusting circuit, not adjusting the charging process, and charging according to the original charging process.

It should be noted that, the charging method according to the embodiment of the present application is implemented by the charging circuit of the first aspect, and the specific adjusting process and the charging process are as described above and are not described herein again.

In a third aspect, the present application also provides a vehicle provided with the charge equalization circuit as described above.

The features of the above embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but should be construed as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.

While the present application has been described in connection with the embodiments, it is to be understood by those skilled in the art that the foregoing description and drawings are merely illustrative and not restrictive of the broad embodiments disclosed. Various modifications and variations are possible without departing from the spirit of the application.