CN208767806U - A kind of equalizing circuit for lithium battery carrying out single-unit charging and more piece charging - Google Patents

Abstract

The utility model discloses the equalizing circuit for lithium batteries that one kind can carry out single-unit charging and more piece charging, including charging control circuit and MCU master control, the charging control circuit, charge power supply detection circuit, positive one-way conduction isolation circuit and power input cathode are in turn connected to form circuit, the MCU master control is positive with power input respectively, charging control circuit, charge power supply detection circuit, positive one-way conduction isolation circuit, cathode single battery charging circuit is connect with power input cathode, wherein positive single battery charging circuit and cathode single battery charging circuit are connect with series-connected cell group, the positive and negative anodes of series-connected cell group are connect with one-way conduction isolation circuit.This patent cooperation single-chip microcontroller can realize the electrically coupled in series charge and discharge of more piece lithium of two sections or two sections or more, when charging series connection in any one batteries occur electricity it is low when, can individually independently the low battery charging of amount of electricity saving, other batteries stop charging thus, will not influence battery discharge use.

Description

A kind of equalizing circuit for lithium battery carrying out single-unit charging and more piece charging

Technical field

The utility model relates to battery charge-discharge circuits, and in particular to one kind can carry out the lithium of single-unit charging and more piece charging Battery equalizing circuit.

Background technique

Existing equalizing circuit euqalizing current is tens milliamperes in the market, and is bypass at single battery both ends, to high electricity Battery carry out current bypass, also discharge the battery of high electricity, influence circulating battery number.

Existing equalizing circuit in the market cannot carry out large current charge, so to electricity to a certain batteries in battery pack Pond requires height, and every batteries need to precisely screen matching, need to guarantee each batteries in series-connected cell group, voltage is identical, interior Hinder identical, capacity is identical.Increase production difficulty, increases cost.

Existing equalizing circuit in the market cannot carry out charge independence, so in battery to a certain batteries in battery pack After group heavy-current discharge, the electricity of every batteries has deviation, this deviation can be increasing with the length for using the time, most After cause battery charging for a moment, just by protection IC protection cannot charge, put for a moment also by protection IC protect cannot discharge.

Utility model content

The purpose of this utility model is to provide one kind can carry out the equalizing circuit for lithium battery that single-unit charging is charged with more piece, To solve the problems mentioned in the above background technology.

To achieve the above object, the utility model provides the following technical solutions: one kind can carry out single-unit charging and more piece is filled The equalizing circuit for lithium battery of electricity, including charging control circuit, charge power supply detection circuit, positive one-way conduction isolation circuit, electricity Source inputs cathode and MCU master control, the charging control circuit, charge power supply detection circuit, positive one-way conduction isolation circuit with Power input cathode is in turn connected to form circuit, the MCU master control respectively with power input anode, charging control circuit, charging Power sense circuit, positive one-way conduction isolation circuit, cathode single battery charging circuit are connect with power input cathode, wherein Positive single battery charging circuit and cathode single battery charging circuit are connect with series-connected cell group, series-connected cell group it is positive and negative Extremely it is connect with one-way conduction isolation circuit.

Further, the charging control circuit is connect with power input anode, load one-way conduction isolation circuit and electricity Source inputs cathode connection.

The technical effect and advantage of the utility model:

1. charging current is big, and will not influence battery.

2. this patent is because that can be individually independently that the low battery of electricity carries out large current charge.So connecting in single battery When at battery pack, every batteries need not screen matching, as long as same specification spec battery.

3. this patent battery be because that need not screen matching, thus it is low to battery request, and reduce and screen matched manpower and material resources, Production difficulty is reduced, overall cost reduces.

4. this patent is because that can be individually independently that the low battery of electricity carries out large current charge.So even if going out in battery pack Existing a certain amount of electricity saving is low, when charging also can equilibrium in time return, how long no matter such battery pack use the time, and electricity is all after charging It can guarantee and be consistent.

Detailed description of the invention

Fig. 1 is the structural block diagram of the utility model；

Fig. 2-3 is two batteries series-connected cell group equalizing sections circuits；

Fig. 4-5 is three batteries series-connected cell group equalizing sections circuits.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

The utility model, which provides one kind as shown in Figure 1, can carry out the balanced electricity of lithium battery of single-unit charging and more piece charging Road, including charging control circuit, charge power supply detection circuit, positive one-way conduction isolation circuit, power input cathode and MCU master Control, the charging control circuit, charge power supply detection circuit, positive one-way conduction isolation circuit and power input cathode successively connect Forming circuit is connect, the MCU master control is single with power input anode, charging control circuit, charge power supply detection circuit, anode respectively It is connect to conducting isolation circuit, cathode single battery charging circuit with power input cathode, wherein positive single battery charging electricity Road and cathode single battery charging circuit are connect with series-connected cell group, and the positive and negative anodes of series-connected cell group are isolated with one-way conduction Circuit connection, the charging control circuit are connect with power input anode, and load one-way conduction isolation circuit and power input are negative Pole connection.

Working principle:

External charger passes through " charging control circuit " and " charging current detecting circuit " from " power input anode " access Carry out Detection & Controling size of current, by " positive one-way conduction isolation circuit " entrance " series-connected cell group ", by the way that " cathode is unidirectional Conducting isolation circuit " arrives " power input cathode " and external power supply is formed into a loop.

When MCU detects that certain batteries electricity is low, it will open " positive single battery charging circuit " or " cathode single-unit Battery charger " charges to single battery in battery pack.Because battery pack positive and negative anodes have " one-way conduction isolation circuit ", so " positive single battery charging circuit " is opened in " cathode one-way conduction isolation circuit " front end.Or in " cathode one-way conduction isolation " cathode single battery charging circuit " is connected in circuit " rear end, will not have an impact to battery pack.

This patent cooperation single-chip microcontroller can realize the electrically coupled in series charge and discharge of more piece lithium of two sections or two sections or more, when charging in series connection Any one batteries occur electricity it is low when, can individually independently the low battery charging of amount of electricity saving, the stopping of other batteries be filled thus Electricity, and charging current will not change, and can also arbitrarily set；It will not influence the internal resistance of cell, will not influence battery discharge use.

Below by taking the series connection of two batteries as an example, battery pack balancing partial circuit is illustrated:

Charge under normal condition: such as Fig. 2, electric current flows through Q1 → L1 → R1 → D2 → battery pack (BAT1, BAT2) from VIN+ → D3 returns to VIN- forming circuit and completes charging, and wherein Q1 controls size of current by the PWM signal in MCU, and MCU passes through The voltage at the both ends R1 is detected to judge size of current.

When amount of electricity saving a certain in battery pack is low, equalizing circuit such as Fig. 3: B1 is that high level opens triode Q3, Q3 current collection Pole drags down metal-oxide-semiconductor Q2 grid voltage, and Q2 is connected.Electric current flows through Q1 → L1 → R1 → Q2 → D4 → BAT1 → D3 from VIN+ Return to charging of the VIN- forming circuit completion to BAT1 single battery.BAT2 does not have electric current to flow through stopping charging at this time.

If Fig. 2: B2 closes for low level triode Q5, Q5 collector is in high-impedance state, draws not low metal-oxide-semiconductor Q4 grid voltage. Q4 is connected.Electric current flows through Q1 → L1 → R1 → D2 → BAT2 → D5 → Q4 from VIN+ and returns to VIN- forming circuit completion pair The charging of BAT2 single-unit.BAT1 does not have electric current to flow through stopping charging at this time.

Below by taking the series connection of three batteries as an example, battery pack balancing partial circuit is illustrated:

Charge under normal condition: such as Fig. 4, electric current from VIN+ flow through Q1 → L1 → R1 → D2 → battery pack (BAT1, BAT2, BAT3) → D3 returns to VIN- forming circuit and completes charging, and wherein Q1 controls size of current, MCU by the pwm signal in MCU Size of current is judged by detecting the voltage at the both ends R1.

When economize on electricity cell voltage a certain in battery pack is low, equalizing circuit such as Fig. 5: B1 is that high level opens triode Q7, Q7 Collector drags down metal-oxide-semiconductor Q6 grid voltage, and Q6 is connected.Electric current flows through Q1 → L1 → R1 → Q6 → D6 → BAT1 from VIN+ → D3 returns to charging of the VIN- forming circuit completion to BAT1 single battery.BAT2, BAT3 do not have electric current to flow through stopping and fill at this time Electricity.

If Fig. 5: B2 closes for low level triode Q9, Q9 collector is in high-impedance state, draws not low metal-oxide-semiconductor Q8 grid voltage And triode Q3 base voltage.Triode Q3 is connected with metal-oxide-semiconductor Q8.Triode Q3 opens rear collector for metal-oxide-semiconductor Q2 grid Voltage pull-down is also switched on Q2.Electric current flows through Q1 → L1 → R1 → Q2 → D4 → BAT2 → D7 → Q8 from VIN+ and returns to VIN- shape The charging to BAT2 single battery is completed at circuit.BAT1, BAT3 do not have electric current to flow through stopping charging at this time.

If Fig. 5: B3 closes for low level triode Q5, Q5 collector is in high-impedance state, draws not low metal-oxide-semiconductor Q4 grid voltage. Q4 is connected.Electric current flows through Q1 → L1 → R1 → D2 → BAT3 → D5 → Q4 from VIN+ and returns to VIN- forming circuit completion pair The charging of BAT3 single-unit.BAT1, BAT2 do not have electric current to flow through stopping charging at this time.

Remarks: one batteries of every increase, need to increase accordingly switching circuit can be completed it is balanced to the single-unit of battery.

Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention, it is not limited to this Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art For, it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of technical characteristic It is equivalently replaced, within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on, It should be included within the scope of protection of this utility model.

Claims (2)

1. one kind can carry out the equalizing circuit for lithium battery of single-unit charging and more piece charging, including charging control circuit, charge power supply Detection circuit, positive one-way conduction isolation circuit, power input cathode and MCU master control, it is characterised in that: the charge control electricity Road, charge power supply detection circuit, positive one-way conduction isolation circuit and power input cathode are in turn connected to form circuit, described MCU master control respectively with power input anode, charging control circuit, charge power supply detection circuit, positive one-way conduction isolation circuit, Cathode single battery charging circuit is connect with power input cathode, wherein positive single battery charging circuit and cathode single battery Charging circuit is connect with series-connected cell group, and the positive and negative anodes of series-connected cell group are connect with one-way conduction isolation circuit.

2. one kind according to claim 1 can carry out the equalizing circuit for lithium battery of single-unit charging and more piece charging, feature Be: the charging control circuit is connect with power input anode, and load one-way conduction isolation circuit and power input cathode connect It connects.