CN208797624U - A kind of battery management circuit, battery pack and electric tool - Google Patents

Abstract

The utility model embodiment is related to battery technology field, discloses a kind of battery management circuit, battery pack and electric tool.The battery management circuit includes: power supply circuit, wake-up circuit, latching circuit, control circuit, charge-discharge circuit and controller, battery pack, power supply circuit, control circuit are in turn connected into circuit, control circuit connects power supply circuit, charge-discharge circuit, charge-discharge circuit connects battery pack, controller connects control circuit, latching circuit, and power supply circuit connects latching circuit, wake-up circuit；Wake-up circuit is used to wake up controller when receiving trigger signal；Controller is used for: control latching circuit makes power supply circuit be locked as on state；Whether control control circuit conducting charge-discharge circuit simultaneously detects the voltage of battery pack and changes；If the voltage of battery pack is unchanged in preset time, control latching circuit stops working, and disconnects power supply circuit.In the above manner, the present embodiment can be effectively reduced cost.

Description

A kind of battery management circuit, battery pack and electric tool

Technical field

The utility model relates to battery technology fields, and in particular to a kind of battery management circuit, battery pack and electric tool.

Background technique

With the development of the society, portable power tool in our life using more and more extensive, as its electric power The battery technology in source also continues to develop.From the aspect of environmental protection and use repeatly, the demand of secondary cell is increasingly Increase, and the advantage that lithium battery relies on it unique, such as energy density height, long service life, discharge voltage height and memory-less effect Deng becoming the ideal battery of portable power tool.It, can be in order to meet the needs of portable power tool is to voltage and capacity It is powered with lithium battery group.

In order to extend the service life of lithium battery group, makes full use of the energy effectively, need to protect lithium battery group Plate does " zero-power " circuit design, stops so that entering when battery pack (including lithium battery group and lithium battery group protection board) is not used by Sleep mode, quiescent dissipation 0；When being inserted into charger, battery pack wake-up is charged；When being inserted into complete machine closure switch, electricity Chi Bao wakes up, and complete machine is started to work.

Inventor has found that current battery management technique passes through complexity during realizing the utility model embodiment Software program is powered output control to lithium battery group, thus realize the zero-power of lithium battery group protection board, this software control Mode processed makes production cost higher.

Utility model content

In order to solve the above technical problems, the utility model aim is to provide a kind of battery management circuit, battery pack and electricity Power driven tools can realize zero-power by hardware plan circuit design, and then effectively reduce cost.

To achieve the goals above, the utility model embodiment discloses following technical solution:

The utility model provides a kind of battery management circuit, is used for battery pack, and the battery management circuit includes: power supply Circuit, wake-up circuit, latching circuit, control circuit, charge-discharge circuit and controller, the power supply circuit, the control circuit Connect respectively with the battery pack, the control circuit is connect with the power supply circuit, the control circuit also with the charge and discharge Electric circuit connection, the charge-discharge circuit are connect with the battery pack, the controller respectively with the control circuit, it is described from Lock circuit connection, the power supply circuit are also connect with the latching circuit, the wake-up circuit respectively；When the wake-up circuit connects When receiving trigger signal, the power supply circuit is connected in the wake-up circuit, and the battery pack is connected with the control circuit, with The battery pack is set to power by the control circuit controller, to wake up the controller；When the controller After being waken up, the controller controls the latching circuit work, so that the power supply circuit is locked as on state, meanwhile, The controller controls the control circuit and the charge-discharge circuit is connected, and controls the control circuit and detect the battery pack Voltage whether change, to control whether the latching circuit works.

In some embodiments, the controller is also connect with the wake-up circuit；When the wake-up circuit receives again When to the trigger signal, sleep signal is sent to the controller, the controller is according to the sleep signal, described in control Latching circuit stops working, so that the power supply circuit disconnects.

In some embodiments, the power supply circuit includes: first diode, first resistor, second resistance, the first electricity Appearance, the second capacitor and the first transistor；The anode of the first diode is connect with the battery pack, the first diode Cathode is connect with one end of the first resistor, and the third end of the other end of the first resistor and the first transistor connects Connect, the first end of the first transistor is connect with the control circuit, the second end of the first transistor respectively with it is described Latching circuit, wake-up circuit connection, one end of the first capacitor is connect with the third end of the first transistor, described The other end of first capacitor is grounded, and one end of the second resistance is connect with the third end of the first transistor, and described second The other end of resistance is connect with the second end of the first transistor, one end and the first transistor of second capacitor First end connection, the other end ground connection of second capacitor.

In some embodiments, the latching circuit includes: 3rd resistor, the 4th resistance and second transistor；Described One end of three resistance is connect with the second end of the first transistor, the other end of the 3rd resistor and the second transistor First end connection, the third end ground connection of the second transistor, the second end of the second transistor and the 4th resistance One end connection, the other end of the 4th resistance connect with the controller.

In some embodiments, the wake-up circuit includes: the 5th resistance, the 6th resistance, switch, the first voltage-stabiliser tube, Eight capacitors and twelfth resistor；One end of 5th resistance is connect with the second end of the first transistor, the 5th electricity The other end of resistance is connect with one end of the switch, and the other end of the switch is connect with the cathode of first voltage-stabiliser tube, institute The plus earth of the first voltage-stabiliser tube is stated, the other end of the switch is also connect with one end of the 6th resistance, the 6th electricity The other end of resistance is connect with the controller, and the other end of the 6th resistance is by the 8th capacity earth, and the described 6th The other end of resistance is grounded by the twelfth resistor.

In some embodiments, the charge-discharge circuit includes third transistor and the 4th transistor；The third crystal The first end of pipe is connect with the first end of the 4th transistor, the second end of the third transistor, the 4th transistor Second end connect respectively with the control circuit, the third end of the third transistor and the battery pack, the third is brilliant The third end of body pipe is grounded；The third end of 4th transistor for connect charging cathode, the first of the third transistor End is for connecting electric discharge cathode.

In some embodiments, the circuit further includes protection circuit, the control circuit by the protection circuit and The battery pack connection.

In some embodiments, the circuit further includes indicator light, and the indicator light is connect with the controller；The control Device processed is also used to: according to the voltage of the battery pack, controlling the state of charge that the indicator light shows the battery pack；The control Device processed is also used to: if the voltage of the battery pack changes, controlling the indicator light flashing.

The utility model additionally provides a kind of battery management method, applied to above-mentioned battery management circuit, the battery Management circuit is connect with battery pack, which comprises after being waken up, the latching circuit work is controlled, so that the confession Circuit is locked as on state；It controls the control circuit and the charge-discharge circuit is connected, and control the control circuit inspection Whether the voltage for surveying the battery pack changes；If the voltage of the battery pack is unchanged in preset time, control described self-locking Circuit stops working, so that the power supply circuit disconnects.

In some embodiments, the method also includes: if the voltage of the battery pack changes in preset time, if institute The voltage variety for stating battery pack is positive, then charges；If the voltage variety of the battery pack is negative, discharge.

The utility model additionally provides a kind of battery pack, including battery pack and above-mentioned battery management circuit, the battery Group is connect with the battery management circuit.

The utility model additionally provides a kind of electric tool, described including charger, electricity consumption complete machine and above-mentioned battery pack Charger is connect with the battery pack, the charger for charging to the battery pack, the electricity consumption complete machine with it is described Battery pack connection, the battery pack are powered in for the electricity consumption complete machine.

The beneficial effect of the utility model embodiment is: being in contrast to the prior art down, the utility model embodiment Power supply circuit is connected by wake-up circuit in a kind of battery management circuit provided, so that battery pack is controller by control circuit Power supply wakes up controller, and power supply circuit is locked and is connected by controller latching circuit, and charge-discharge circuit is connected, while passing through control Whether the voltage of circuit detection battery pack processed changes, and when the voltage of battery pack in preset time is unchanged, controls latching circuit It stops working, disconnects power supply circuit, battery pack is to controller for electrically disconnected, and controller powers off, to pass through hardware plan Circuit design realizes zero-power, can be effectively reduced cost.

Detailed description of the invention

One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove Non- to have special statement, composition does not limit the figure in attached drawing.

Fig. 1 is the structural schematic diagram of electric tool provided by the embodiment of the utility model；

Fig. 2 is the structural schematic diagram of battery pack provided by the embodiment of the utility model；

Fig. 3 is the structural schematic diagram of battery management circuit provided by the embodiment of the utility model；

Fig. 4 is the structural schematic diagram of battery management circuit provided by the embodiment of the utility model；

Fig. 5 is the flow diagram of battery management method provided by the embodiment of the utility model.

Specific embodiment

It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to The range of the utility model protection.

As long as in addition, technical characteristic involved in the various embodiments of the present invention described below each other it Between do not constitute conflict and can be combined with each other.

In the field battery management system (Battery Management System, BMS), when charger does not access When lithium battery group, lithium battery group is needed voluntarily to power for lithium battery protection board.When protection board is in standby, can consume The electricity of lithium battery itself makes the voltage of lithium battery group very when protection board falls the remaining electric quantity consumption of lithium battery group itself It is low, it will cause cell damage.

Current battery management technique passes through the discharge voltage and discharge current that microcontroller detection lithium battery group is arranged Variation is to judge the working condition of battery, and by the voltage value variation of detection battery pack, control battery pack for electricity output, To cut off power supply of the battery pack to protection board when battery pack is not at discharge condition, to realize zero-power.But this control Mode not only needs to use software scenario circuit design in battery pack, it is also necessary to also use software in charger and electricity consumption complete machine Resolution circuitry design, so that electric tool (including battery pack, charger and electricity consumption complete machine) production cost is higher.

Based on this, the utility model embodiment provides a kind of battery management method, circuit, battery pack and electric tool, leads to It crosses and zero-power is realized using hardware plan circuit design, can be effectively reduced cost.

The battery management circuit of the utility model embodiment can be used as one of functional unit, be independently arranged at battery Packet or battery management system in, can also be used as be integrated into a functional module carry out using.

Specifically, with reference to the accompanying drawing, the utility model embodiment is further elaborated.

Fig. 1 is the structural schematic diagram of electric tool provided by the embodiment of the utility model.As shown in Figure 1, electric tool 400 Including charger 410, electricity consumption complete machine 420 and battery pack 300, charger 410 is connect with battery pack 300, charger 300 for pair Battery pack 300 charges, and electricity consumption complete machine 420 is connect with battery pack 300, and battery pack 300 is used to power for electricity consumption complete machine 420. Wherein, electricity consumption complete machine 420 can be electric drill, electric wrench, electric screw driver, electric drill etc., and electricity consumption complete machine 420 passes through connection electricity Pond packet 300 obtains electric energy, and when battery pack 300 is out of power, battery pack 300 connect with charger 410 and charges.

Fig. 2 is the structural schematic diagram of battery pack provided by the embodiment of the utility model.As shown in Fig. 2, battery pack 300 includes Battery pack 200 and battery management circuit 100, battery pack 200 is attached with 100 circuit of battery management circuit, thus cell tube Reason circuit 100 controls the charge and discharge of battery pack 200, and is not used in battery pack 300 and (does not carry out charge and discharge) When, battery management circuit 100 is automatically into zero-power mode, to cut off power supply of the battery pack 200 to battery management circuit 100. Wherein, battery pack 200 can be lithium battery group etc., and in the present embodiment, battery pack 200 is lithium battery group.Wherein, cell tube Reason circuit 100 can be fabricated to pcb board, be placed in same housing as the protection board of battery pack 200, and with battery pack 200.

Fig. 3 is the structural schematic diagram of battery management circuit provided by the embodiment of the utility model.As shown in figure 3, cell tube Managing circuit 100 includes: power supply circuit 110, wake-up circuit 120, latching circuit 130, control circuit 140,150 and of charge-discharge circuit Controller 160.

Wherein, power supply circuit 110, control circuit 140 are connect with battery pack 200 respectively, control circuit 140 and power supply circuit 110 connections, so that power supply circuit 110, battery pack 200, control circuit 140 are formed into a loop；Control circuit 140 is also electric with charge and discharge Road 150 connects, and charge-discharge circuit 150 is connect with battery pack 200；Controller 160 respectively with control circuit 140, latching circuit 130 Connection, power supply circuit 110 are also connect with latching circuit 130, wake-up circuit 120 respectively.Optionally, controller 160 also with wake-up Circuit 120 connects.

Specifically, Fig. 3 and Fig. 4 are please referred to, the first end of power supply circuit 110 is connect with the anode of battery pack 200, power supply electricity The second end on road 110 is connect with control circuit 140, to make 200 control circuit of battery pack when power supply circuit 110 is connected 140 power supplies, when power supply circuit 110 disconnects, stopping battery pack 200 is that control circuit 140 is powered.The of power supply circuit 110 One end be also used to connect charger perhaps external equipment thus connect charger charging anode or external equipment electric discharge just Pole.The third end of power supply circuit 110 is connect with latching circuit 130 and wake-up circuit 120 respectively.

Specifically, power supply circuit 110 include first diode D1, first resistor R1, second resistance R2, first capacitor C1, Second capacitor C2 and the first transistor Q1.The anode of first diode D1 is connect with the anode of battery pack 200, first diode D1 Cathode connect with one end of first resistor R1, the other end of first resistor R1 is connect with the third end of the first transistor Q1, The first end of one transistor Q1 is connect with control circuit 140, the second end of the first transistor Q1 respectively with latching circuit 130, call out Circuit 120 of waking up connects, and one end of first capacitor C1 is connect with the third end of the first transistor Q1, another termination of first capacitor C1 Ground, one end of second resistance R2 are connect with the third end of the first transistor Q1, the other end and the first transistor of second resistance R2 The second end of Q1 connects, and one end of the second capacitor C2 is connect with the first end of the first transistor Q1, the other end of the second capacitor C2 Ground connection.

Optionally, the first transistor Q1 is PNP type triode, and the first end of the first transistor Q1 is the current collection of triode Pole, the second end of the first transistor Q1 are the base stage of triode, and the third end of the first transistor Q1 is the emitter of triode.When So, in some other embodiments, the first transistor Q1 can also be metal-oxide-semiconductor or the identical circuit of other function.

Wherein, the just extremely first end of power supply circuit 110 of first diode D1, the first end of the first transistor Q1 are to supply The second end of circuit 110, the second end of the first transistor Q1 are the third end of power supply circuit 110.

Wherein, which further includes charging anode/electric discharge positive terminal B+/CH+, anode/electric discharge of charging Positive terminal B+/CH+ is connect with the anode of battery pack 200, and charging anode/electric discharge positive terminal B+/CH+ is for connecting charging just Pole or electric discharge anode, when battery management circuit 100 is applied to the battery pack in electric tool, charging anode can be electronic work The anode of charger in tool, to be battery pack charging by charger, electric discharge anode can be the electricity consumption in electric tool Anode in complete machine, to be the power supply of electricity consumption complete machine by battery pack.Optionally, charge anode/electric discharge positive terminal B+/CH+ It may be two different terminals, two different terminals are connect with the anode of battery pack 200 respectively.

The first end of wake-up circuit 120 is connect with the third end of power supply circuit 110, the second end ground connection of wake-up circuit 120. Wake-up circuit 120 is used for when receiving trigger signal, and power supply circuit 110 is connected, leads battery pack 200 with control circuit 140 It is logical, so that battery pack 200 is the power supply of controller 140 by control circuit 140, to wake up controller 140.

Optionally, the third end of wake-up circuit 120 is connect with controller 160, and wake-up circuit 120 is also used to receive again When to trigger signal, sleep signal is sent to controller 160.

Specifically, wake-up circuit 120 includes the 5th resistance R5, the 6th resistance R6, switch BSW, the first voltage-stabiliser tube ZD1, the Eight capacitor C8 and twelfth resistor R12.One end of 5th resistance R5 is connect with the second end of the first transistor Q1, the 5th resistance R5 The other end connect with one end of switch BSW, the other end of switch BSW is connect with the cathode of the first voltage-stabiliser tube ZD1, the first pressure stabilizing The plus earth of pipe ZD1, the other end of switch BSW are also connect with one end of the 6th resistance R6, the other end of the 6th resistance R6 with Controller 160 connects, and the other end of the 6th resistance R6 is grounded by the 8th capacitor C8, and the other end of the 6th resistance R6 passes through the tenth Two resistance R12 ground connection.

Wherein, one end of the 5th resistance R5 is the first end of wake-up circuit 120, and the first voltage-stabiliser tube ZD1's just extremely wakes up The second end of circuit 120, the other end of the 6th resistance R6 are the third end of wake-up circuit 120.

Wherein, switch BSW is trigger switch, and trigger switch can bounce immediately after being pressed.Switch BSW is for receiving touching It signals, when touching is by switch BSW, then switch BSW receives trigger signal, and the 5th resistance R5 is steady by switch BSW and first Pressure pipe ZD1 conducting, to wake up controller 160, controller 160 controls latching circuit 130 and works；When switch BSW is pressed in touching again When, then switch BSW receives trigger signal again, sleep signal is sent to controller 160, so that controller 160 is according to control Signal control latching circuit 130 stops working.

In the present embodiment, switch BSW is pressed in touching, then wake-up circuit 120 receives trigger signal, and transient current flows to successively Are as follows: battery pack 200, first diode D1, first resistor R1, the emitter of the first transistor Q1, the first transistor Q1 base stage, 5th resistance R5, switch BSW, the first voltage-stabiliser tube ZD1, so that the base stage of the first transistor Q1 is low level, so that first is brilliant Body pipe Q1 conducting, then battery pack 200 is powered by power supply circuit 110 to control circuit 140, so that control circuit 140 is to control Device 160 powers and then wakes up controller 160.When controller 160 is in wake-up states, switch BSW, wake-up circuit are pressed in touching again 120 one rising edge signal of output to controller 160, controller 160 controls latching circuit 130 and disconnects.

The first end of latching circuit 130 is connect with controller 160, second end and the power supply circuit 110 of latching circuit 130 The connection of third end, the third end ground connection of latching circuit 130.Latching circuit 130 is used under the control of controller 160, will be powered Circuit 110 is locked as on state.

Specifically, latching circuit 130 includes 3rd resistor R3, the 4th resistance R4 and second transistor Q2.3rd resistor R3 One end connect with the second end of the first transistor Q1, the first end of the other end of 3rd resistor R3 and second transistor Q2 connect It connects, the third end ground connection of second transistor Q2, the second end of second transistor Q2 is connect with one end of the 4th resistance R4, the 4th electricity The other end of resistance R4 is connect with controller 160.

Wherein, the first end of latching circuit 130 is the other end of the 4th resistance R4, and the second end of latching circuit 130 is the One end of three resistance R3, the third end of latching circuit 130 are the third end of second transistor Q2.

Optionally, second transistor Q2 is NPN type triode, and the first end of second transistor Q2 is the current collection of triode Pole, the second end of second transistor Q2 are the base stage of triode, and the third end of second transistor Q2 is the emitter of triode.When So, in some other embodiments, second transistor Q2 can also be metal-oxide-semiconductor or the identical circuit of other function.

In the present embodiment, when the first end of latching circuit 130 receives the high level signal of controller 160, second The base stage of transistor Q2 is high level, then the collector and emitter conducting of second transistor Q2, then the second of latching circuit 130 Power supply circuit 110 is locked as on state so that latching circuit 130 works by end output low level；When latching circuit 130 When first end receives the low level signal of controller 160, the base stage of second transistor Q2 is low level, second transistor Q2's Collector and emitter is not turned on, so that latching circuit 130 stops working, so that power supply circuit 110 disconnects.

Control circuit 140 can be IC chip, such as the bq769x0 of Texas Instrument, the steady durable pattern of series Quasi- front end (AFE) device is typically used as next-generation high power system (for example, lightweight electric powered vehicles, electric tool and not Uninterruptible power) completed cell group monitoring and protection solution a part.

In the present embodiment, referring again to Fig. 4, the 1st negative cell terminal end of control circuit 140 detects voltage pin VC0 ground connection, the 1st battery positive terminal detection voltage pin VC1, the 2nd battery positive terminal detect voltage pin VC2 ... N-th of battery positive terminal detection voltage pin VCn connect the (pin of connection with each battery unit in battery pack 200 respectively Number is determined according to the number of the battery unit of battery pack 200), the electric discharge driving pin DSG of control circuit 140, charging driving Pin CHG is connect with charge-discharge circuit 150 respectively, the input source pin REGSRC and power supply electricity of the output LDO of control circuit 140 The second end on road 110 connects, and the output LDO pin REGOUT of control circuit 140 is connect with the voltage pin VDD of controller 160, Also, other communications pins of control circuit 140 are connect by COM with controller 140, to be communicated.Wherein, in Fig. 4 Control circuit 140 other pins and peripheral circuit is omitted, other pins and peripheral circuit can be according to actual use situations It is arranged accordingly.

Wherein, when electric discharge driving pin DSG, charging driving pin CHG are disposed as high level by control circuit 140, Then charge-discharge circuit 150 is connected in control circuit 140, at this time can be to 200 charge or discharge of battery pack.Control circuit 140 passes through The voltage change of monocell in each detection voltage pin detection battery pack 200, so that whether the voltage for detecting battery pack 200 becomes Change, for example, the voltage increment+△ V/T of monocell gradually becomes smaller, when the voltage increment of monocell when charging to battery pack 200 When+△ V/T becomes 0, then the charging of battery pack 200 is saturated；When discharging battery pack 200, the voltage decrement-△ V/T of monocell It gradually becomes smaller, when the voltage decrement-△ V/T of monocell becomes 0, then the electric discharge of battery pack 200 is completed.

Wherein, when power supply circuit 110 is connected, control circuit 140 is by the input source pin REGSRC of output LDO from electricity 200 input power of pond group, and exported by exporting LDO pin REGOUT to controller 160, so that battery pack 200 be made to pass through control Circuit 140 processed is the power supply of controller 160.

First control terminal of charge-discharge circuit 150 is connect with control circuit 140, the second control terminal of charge-discharge circuit 150 It is connect with control circuit 140, the third end of charge-discharge circuit 150 and 200 connect and ground of battery pack, charge-discharge circuit 150 4th end is connect with charging cathode, and the 5th end of charge-discharge circuit 150 is connect with electric discharge cathode.Control circuit 140 passes through setting The level signal of first control terminal and the second control terminal, so that the charge and discharge of battery pack 200 are controlled, for example, the first control of control End and the second control terminal are high level, then can be connect by the 4th end with charging cathode and be charged to battery pack 200, this When control the second control terminal be low level, then stopping of charging；In another example the first control terminal of control is high level, the second control terminal For low level, then it can be connect by the 5th end with electric discharge cathode and be discharged battery pack 200, control the first control terminal at this time For low level, then stopping of discharging.

Specifically, charge-discharge circuit 150 includes third transistor Q3 and the 4th transistor Q4.The first of third transistor Q3 End is connect with the first end of the 4th transistor Q4, and the electric discharge of the second end and control circuit 140 of third transistor Q3 drives pin The second end of DSG connection, the 4th transistor Q4 is connect with the charging of control circuit 140 driving pin CHG, third transistor Q3's Third end is connect with the cathode of battery pack 200, the third end ground connection of third transistor Q3.The third end of 4th transistor Q4 is used for Connection charging cathode, the first end of third transistor Q3 is for connecting electric discharge cathode.

Wherein, which further includes charging negative terminal CH- and electric discharge negative terminal B-, and charge cathode Terminal CH- is connect with the third end of the 4th transistor Q4, and electric discharge negative terminal B- is connect with the first end of third transistor Q3, the The third end of four transistor Q4 is by charging negative terminal CH- connection charging cathode, and the first end of third transistor Q3 is by putting Electric negative terminal B- connection electric discharge cathode.Wherein, it when battery management circuit 100 is applied to the battery pack in electric tool, fills Electric cathode can be the cathode of the charger in electric tool, to be battery pack charging by charger；When battery management electricity When road 100 is applied to the battery pack in electric tool, electric discharge cathode can be the cathode in the electricity consumption complete machine in electric tool, from It and is the power supply of electricity consumption complete machine by battery pack.

Optionally, charge-discharge circuit 150 further includes third diode D3 and the 4th diode D4.Third diode D3 is just Pole is connect with the third end of third transistor Q3, and the cathode of third diode D3 is connect with the first end of third transistor Q3, the The anode of four diode D4 is connect with the third end of the 4th transistor Q4, the cathode of the 4th diode D4 and the 4th transistor Q4's First end connection.Third diode D3 and the 4th diode D4 is prevented for protecting third transistor Q3 and the 4th transistor Q4 Third transistor Q3 and the 4th transistor Q4 are breakdown.

Optionally, third transistor Q3, the 4th transistor Q4 are the enhanced metal-oxide-semiconductor of N-channel, and the of third transistor Q3 One end, the 4th transistor Q4 first end be the drain electrode of metal-oxide-semiconductor, the of the second end of third transistor Q3, the 4th transistor Q4 Two ends are the grid of metal-oxide-semiconductor, the third end of third transistor Q3, the source electrode that the third end of the 4th transistor Q4 is metal-oxide-semiconductor.When So, in some other embodiments, third transistor Q3, the 4th transistor Q4 can also be triode, other FET are managed or it The identical circuit of his function.

In this example, when charging to battery pack 200, charger is connect with battery management circuit 100, and charging anode/ Discharge positive terminal B+/CH+ connection charging anode, charging negative terminal CH- connection charging cathode, third transistor Q3 and the 4th Transistor Q4 conducting, then the anode that charges/electric discharge positive terminal B+/CH+, battery pack 200, third transistor Q3, the 4th crystal Pipe Q4, charging negative terminal CH- form charge circuit, to charge, at this time end the 4th transistor Q4, then charging stops Only；When battery pack 200 is discharged, electricity consumption complete machine is connect with battery management circuit 100, and charge anode/electric discharge positive terminal B+/CH + connection electric discharge anode, electric discharge negative terminal B- connection electric discharge cathode, third transistor Q3 conducting, the 4th transistor Q4 cut-off, then Discharge negative terminal B-, third transistor Q3, battery pack 200, charging anode/electric discharge positive terminal B+/CH+ form electric discharge Circuit at this time ends third transistor Q3, then stopping of discharging to discharge.

Controller 160 can be include processor, with control processing function specific integrated circuit (Application- Specific Integrated Circuit, ASIC), field-programmable gate array (Field Programmable Gate Array, FPGA), single-chip microcontroller etc..Controller 160 is connect with power supply circuit 110, control circuit 140, latching circuit 130 respectively, Controller 160 is used for: after being waken up, control latching circuit 130 works, so that power supply circuit 110 is locked as on state；Control Charge-discharge circuit 150 is connected in control circuit 140 processed, and whether the voltage for controlling the detection battery pack 200 of control circuit 140 changes； If the voltage of battery pack 200 is unchanged in preset time, controls latching circuit 130 and stop working, so that power supply circuit 110 is disconnected It opens.

Optionally, controller 160 is also connect with wake-up circuit 120, and controller 160 is also used to be sent out according to wake-up circuit 120 The sleep signal sent, control latching circuit 130 stops working, so that power supply circuit 110 disconnects.

Specifically, in the present embodiment, controller 160 is single-chip microcontroller, such as A94B114.The voltage pin of controller 160 VDD is connect with the output LDO pin REGOUT of control circuit 140, the wherein I/O pin and latching circuit 130 of controller 160 First end connection, another I/O pin of controller 160 connect with the third end of wake-up circuit 120, controller 160 other Communications pins also pass through COM and connect with other communications pins of control circuit 140, thus communicated with control circuit 140, with Control the work of control circuit 140.Wherein, other pins and peripheral circuit is omitted in the controller 160 in Fig. 4, for example, omitting Overload protection current detecting pin and circuit design, also omit battery pack overheat protector NTC detection and circuit design etc., Other pins and peripheral circuit can be arranged accordingly according to actual use situation.

In the present embodiment, when control circuit 140 provides power supply to controller 160 by output LDO pin REGOUT, Controller 160 is waken up；After controller 160 is waken up, controller 160 is by exporting high electricity to one end of the 4th resistance R4 Flat, so that latching circuit 130 works, power supply circuit 110 is locked as on state, and then controller 160 is controlled by COM Charge-discharge circuit 150 is connected in circuit 140, and whether the voltage for controlling the detection battery pack 200 of control circuit 140 changes, if default The voltage that the battery pack 200 of the feedback of control circuit 140 is received in time is unchanged, then exports to one end of the 4th resistance R4 low Level, so that latching circuit 130 stops working, power supply circuit 110 is disconnected.When receiving the sleep signal of wake-up circuit 120, Controller 160 exports low level to one end of the 4th resistance R4, stops working to control latching circuit 130, then battery management Circuit 100 enters zero-power mode.

Optionally, also referring to Fig. 3 and Fig. 4, battery management circuit 100 can also include protection circuit 170, control electricity Road 140 is by protecting circuit 170 to be attached with battery pack 200.Specifically, protection circuit 170 includes several resistance and several Capacitor, each resistance is separately connected the anode of 200 1 monocell of battery pack and the detection voltage pin of control circuit 140, each Capacitor is separately connected the two neighboring detection voltage pin of control circuit 140.Circuit 170 is protected by setting, one is provided and puts Electrical circuit when preventing the switch in battery pack 200 from ending, generates high pressure and hits and damage to control circuit 140.

Optionally, referring again to Fig. 3, battery management circuit 100 can also include indicator light 180, indicator light 180 and control Device 160 connects.Controller 160 is also used to: according to the voltage of battery pack 200, control instructions lamp 180 shows the electricity of battery pack 200 Amount state；Controller 160 is also used to: if the voltage of battery pack 200 changes, control instructions lamp 180 flashes.Wherein, indicator light 180 may include several LED light, and the state of charge of battery pack 200 is shown by the LED light number lighted, passes through control One of LED light flashing is changed with the voltage for showing battery pack 200.Specific embodiment can be with are as follows: when switch BSW is pressed in touching When, controller 160 is waken up, preset time is continued according to the LED light that the voltage for measuring battery pack 200 lights corresponding number, if It is detected simultaneously by (battery pack 200 is just in charge or discharge) when the voltage of battery pack 200 changes, then controls minimum electricity and refers to Show that lamp is flashed according to predeterminated frequency, to indicate that battery pack enters standby mode, if detecting the electricity of battery pack 200 in preset time It presses when not changing (battery pack 200, which charges, to be terminated or electric discharge terminates or no progress charge and discharge), then control instructions lamp 180 It does not light, to indicate that battery pack enters suspend mode；If battery pack enters standby mode, switch BSW, controller are pressed in touching again 160 enter suspend mode, then indicator light 180 is not lighted.

For example, indicator light 180 includes 4 LED light A, B, C, D, when touching is by switch BSW, controller 160 is waken up, if Controller 160 is 75% by the voltage that control circuit 140 measures battery pack 200, then lightening LED lamp A, B, C is for 3 seconds, if It is detected simultaneously by (battery pack 200 is charging) when the voltage of battery pack 200 changes, then controlling LED light C flashing, (frequency is 1Hz), to indicate that battery pack enters standby mode, if charging complete, detect that the voltage of battery pack 200 does not all become in 5 minutes Change, then control instructions lamp 180 extinguishes, to indicate that battery pack enters suspend mode.

In the present embodiment, the course of work of battery management circuit 100 is substantially are as follows: if charge to battery pack, first Switch BSW is pressed in touching, and wake-up circuit 120 receives trigger signal, conducting power supply circuit 110, power supply circuit 110, battery pack 200, Control circuit 140 is formed into a loop, and battery pack 200 is the power supply of controller 160 by control circuit 140, and controller 160 is waken up, It is on state that controller 160, which controls latching circuit 130 and locks power supply circuit 110, and controls control circuit 140 and charge and discharge is connected Circuit 150, and the voltage change of battery pack 200 is detected, while after the display electricity of control instructions lamp 180, control instructions lamp 180 Flashing, to prompt user's battery pack to enter standby mode；If within a preset time, be inserted into charger, battery management circuit 100 with Charger connection, charger charge to battery pack 200, and controller 160 detects battery pack 200 by control circuit 140 The voltage variety of monocell be positive, and voltage increment+△ V/T (positive voltage variety) gradually become smaller (while with The 160 control instructions lamp 180 of electric quantity change controller of battery pack 200 shows corresponding electricity), when monocell voltage increment+ When △ V/T becomes 0, the charging saturation of battery pack 200, controller 160 controls the 4th transistor Q4 cut-off of charge-discharge circuit 150, Stop charging；If voltage increment+△ the V/T of monocell is 0 always within a preset time, controller 160 controls latching circuit 130 stop working, and controller 160 powers off, and indicator light 180 extinguishes, then battery pack enters zero-power mode；If battery pack 200 is filled When electric unsaturated, charger is extracted, then after preset time, controller 160 detects that the voltage of battery pack 200 is unchanged, then Controller 160 controls latching circuit 130 and stops working, and controller 160 powers off, and battery pack enters zero-power mode；If battery pack When 200 chargings are unsaturated, charger is extracted, within a preset time, and charger is inserted into, then charger is to battery pack 200 Continue to charge；If within a preset time, being not inserted into charger, controller 160 detects the voltage of battery pack 200 without change Change, then controller 160 controls latching circuit 130 and stops working, and controller 160 powers off, and battery pack enters zero-power mode.

If discharge battery pack, switch BSW is pressed in first touching, and wake-up circuit 120 receives trigger signal, conducting power supply Circuit 110, battery pack 200 are the power supply of controller 160 by control circuit 140, and controller 160 is waken up, and controller 160 controls It is on state that latching circuit 130, which locks power supply circuit 110, and controls control circuit 140 and charge-discharge circuit 150 is connected, and The voltage change of battery pack 200 is detected, while after the display electricity of control instructions lamp 180, control instructions lamp 180 flashes, with prompt User's battery pack enters standby mode；If within a preset time, being inserted into electricity consumption complete machine, battery management circuit 100 and electricity consumption complete machine Connection, battery pack 200 discharge to electricity consumption complete machine, and controller 160 detects the list of battery pack 200 by control circuit 140 The voltage variety of battery is negative, and voltage decrement-△ V/T (negative voltage variety) gradually becomes smaller (while with battery The 160 control instructions lamp 180 of electric quantity change controller of group 200 shows corresponding electricity), as the voltage decrement-△ V/T of monocell When becoming 0,200 electricity of battery pack exhausts, and controller 160 controls third transistor Q3 cut-off, stops electric discharge；If in preset time Voltage decrement-△ the V/T of interior monocell is 0 always, then controller 160 controls latching circuit 130 and stops working, controller 160 Power-off, indicator light 180 extinguish, and battery pack enters zero-power mode；If 200 electricity of battery pack does not exhaust, electricity consumption complete machine is pulled out Out, then after preset time, controller 160 detects that the voltage of battery pack 200 is unchanged, and controller 160 powers off, and battery pack enters Zero-power mode；If 200 electricity of battery pack does not exhaust, electricity consumption complete machine is extracted, within a preset time, and electricity consumption complete machine is inserted Enter, then battery pack 200 continues to discharge to electricity consumption complete machine；If within a preset time, being not inserted into electricity consumption complete machine, controller 160 detect that the voltage of battery pack 200 is unchanged, and controller 160 powers off, and battery pack enters zero-power mode.

In this example, which is connected power supply circuit 110 by wake-up circuit 120, thus battery pack 200 by control circuit 140 be controller 160 power, wake up controller 160,160 controller latching circuit 130 of controller general The locking conducting of power supply circuit 110, and charge-discharge circuit 150 is connected, while the electricity of battery pack 200 is detected by control circuit 140 Whether pressure changes, and when the voltage of battery pack 200 in preset time is unchanged, control latching circuit 130 stops working, and makes to power Circuit 110 disconnects, and battery pack 200 is to controller 160 for electrically disconnected, and controller 160 powers off, thus by using hardware plan Circuit design realizes zero-power, can be effectively reduced cost, and without when battery management circuit 100 is connect with external equipment Whether confirmation is connected to each other, can be directly realized by charge and discharge control, and friction or electrostatic is avoided to cause to damage to MCU and electronic component, So that battery pack increased quality.

Fig. 5 is the flow diagram of battery management method provided by the embodiment of the utility model.As shown in figure 5, the battery Management method is applied to the battery management circuit 100 of above-described embodiment, and battery management circuit 100 is connect with battery pack 200, the electricity Pond management method includes:

510, after being waken up, the latching circuit work is controlled, so that the power supply circuit is locked as on state；

520, it controls the control circuit and the charge-discharge circuit is connected, and control the control circuit and detect the battery Whether the voltage of group changes；

If 530, the voltage of the battery pack is unchanged in preset time, controls the latching circuit and stop working, with Disconnect the power supply circuit.

Optionally, the battery management method further include: 540, reception sleep signal, according to the sleep signal, control institute It states latching circuit to stop working, so that the power supply circuit disconnects.

Optionally, the battery management method further include: if the voltage of the battery pack changes in 550, preset time, if The voltage variety of the battery pack is positive, then charges；If the voltage variety of the battery pack is negative, put Electricity.

The above method can be applied to battery management circuit provided by the utility model embodiment, have battery management circuit Beneficial effect.The not technical detail of detailed description in the present embodiment, reference can be made to electricity provided by the utility model embodiment Pond manages circuit.

Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations； Under the thinking of the utility model, it can also be combined between the technical characteristic in above embodiments or different embodiments, Step can be realized with random order, and there are many other variations of the different aspect of the utility model as described above, be Simplicity, they do not provide in details；Although the utility model is described in detail with reference to the foregoing embodiments, this The those of ordinary skill in field it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments, Or equivalent replacement of some of the technical features；And these are modified or replaceed, and do not make the sheet of corresponding technical solution Matter departs from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. a kind of battery management circuit, which is characterized in that be used for battery pack, the battery management circuit includes: power supply circuit, calls out Wake up circuit, latching circuit, control circuit, charge-discharge circuit and controller, the power supply circuit, the control circuit respectively with institute Battery pack connection is stated, the control circuit is connect with the power supply circuit, and the control circuit also connects with the charge-discharge circuit It connects, the charge-discharge circuit is connect with the battery pack, and the controller connects with the control circuit, the latching circuit respectively It connects, the power supply circuit is also connect with the latching circuit, the wake-up circuit respectively；

When the wake-up circuit receives trigger signal, the power supply circuit is connected in the wake-up circuit, makes the battery pack It is connected with the control circuit, so that the battery pack is controller power supply by the control circuit, to wake up institute State controller；

After the controller is waken up, the controller controls the latching circuit work, so that the power supply circuit locks For on state, meanwhile, the controller controls the control circuit and the charge-discharge circuit is connected, and it is electric to control the control Whether the voltage that the battery pack is detected on road changes, to control whether the latching circuit works.

2. circuit according to claim 1, which is characterized in that the controller is also connect with the wake-up circuit；

When the wake-up circuit receives the trigger signal again, sleep signal is sent to the controller, the control Device controls the latching circuit and stops working according to the sleep signal, so that the power supply circuit disconnects.

3. circuit according to claim 2, which is characterized in that the power supply circuit includes: first diode, the first electricity Resistance, second resistance, first capacitor, the second capacitor and the first transistor；

The anode of the first diode is connect with the battery pack, the cathode of the first diode and the first resistor One end connection, the other end of the first resistor connect with the third end of the first transistor, and the of the first transistor One end is connect with the control circuit, the second end of the first transistor respectively with the latching circuit, the wake-up circuit Connection, one end of the first capacitor are connect with the third end of the first transistor, the other end ground connection of the first capacitor, One end of the second resistance is connect with the third end of the first transistor, the other end of the second resistance and described first The second end of transistor connects, and one end of second capacitor is connect with the first end of the first transistor, second electricity The other end of appearance is grounded.

4. circuit according to claim 3, which is characterized in that the latching circuit include: 3rd resistor, the 4th resistance and Second transistor；

One end of the 3rd resistor is connect with the second end of the first transistor, the other end of the 3rd resistor with it is described The first end of second transistor connects, the third end ground connection of the second transistor, the second end of the second transistor and institute One end connection of the 4th resistance is stated, the other end of the 4th resistance is connect with the controller.

5. circuit according to claim 4, which is characterized in that the wake-up circuit include: the 5th resistance, the 6th resistance, Switch, the first voltage-stabiliser tube, the 8th capacitor and twelfth resistor；

One end of 5th resistance is connect with the second end of the first transistor, the other end of the 5th resistance with it is described One end of switch connects, and the other end of the switch is connect with the cathode of first voltage-stabiliser tube, and first voltage-stabiliser tube is just Pole ground connection, the other end of the switch also connect with one end of the 6th resistance, the other end of the 6th resistance with it is described Controller connection, by the 8th capacity earth, the other end of the 6th resistance passes through the other end of the 6th resistance The twelfth resistor ground connection.

6. circuit according to claim 5, which is characterized in that the charge-discharge circuit includes that third transistor and the 4th are brilliant Body pipe；

The first end of the third transistor is connect with the first end of the 4th transistor, and the second of the third transistor End, the 4th transistor second end connect respectively with the control circuit, the third end of the third transistor with it is described Battery pack, the third end ground connection of the third transistor；

The third end of 4th transistor is for connecting charging cathode, and the first end of the third transistor is for connecting electric discharge Cathode.

7. circuit according to claim 1-6, which is characterized in that the circuit further includes protection circuit, described Control circuit is connect by the protection circuit with the battery pack.

8. circuit according to claim 1-6, which is characterized in that the circuit further includes indicator light, the finger Show that lamp is connect with the controller；

The controller is also used to: according to the voltage of the battery pack, controlling the electricity that the indicator light shows the battery pack State.

9. a kind of battery pack, which is characterized in that including battery pack and the described in any item battery management circuits of claim 1-8, The battery pack is connect with the battery management circuit.

10. a kind of electric tool, which is characterized in that including charger, electricity consumption complete machine and battery pack as claimed in claim 9, institute It states charger to connect with the battery pack, the charger is for charging to the battery pack, the electricity consumption complete machine and institute Battery pack connection is stated, the battery pack is powered in for the electricity consumption complete machine.