CN105322620A - Charge and discharge device of lithium battery pack - Google Patents

Charge and discharge device of lithium battery pack Download PDF

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Publication number
CN105322620A
CN105322620A CN201510835160.2A CN201510835160A CN105322620A CN 105322620 A CN105322620 A CN 105322620A CN 201510835160 A CN201510835160 A CN 201510835160A CN 105322620 A CN105322620 A CN 105322620A
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China
Prior art keywords
discharge
pin
lithium battery
charge
positive
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CN201510835160.2A
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Chinese (zh)
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CN105322620B (en
Inventor
王冬文
刘金成
吕正中
葛辉明
余小文
秦忠荣
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惠州亿纬锂能股份有限公司
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Priority to CN201510835160.2A priority Critical patent/CN105322620B/en
Publication of CN105322620A publication Critical patent/CN105322620A/en
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Publication of CN105322620B publication Critical patent/CN105322620B/en

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Abstract

The invention discloses a charge and discharge device of a lithium battery pack. The charge and discharge device comprises a charge connector and a discharge connector, wherein at least two lithium battery units are connected to a power supply in series for charging through the charge connector when the lithium battery pack is in a charged state; the at least two lithium battery units are connected to a lead in parallel for discharging through the discharge connector when the lithium battery pack is in a discharged state. When the lithium battery pack disclosed by the embodiment of the invention is in the charged state, the lithium battery units are connected in series, so that quick charging of the lithium battery pack can be achieved; and when the lithium battery pack is in the discharged state, the lithium battery units are connected in parallel, the internal resistance of the lithium battery pack is smaller than that of any lithium battery unit, and the internal resistance of the lithium battery pack is reduced, so that heavy-current discharging of the lithium battery pack can be achieved.

Description

A kind of lithium battery group charge and discharge device
Technical field
The embodiment of the present invention relates to lithium battery technology, particularly relates to a kind of lithium battery group charge and discharge device.
Background technology
Nowadays, lithium battery applications scope is comparatively wide, larger for lithium battery group use amount in social all trades and professions.
At present, each lithium cells series-connection charge-discharge of main employing in the use procedure of lithium battery group.When each lithium cells discharged in series in lithium battery, the internal resistance sum of the lithium cells that the internal resistance of lithium battery group comprises for it, larger internal resistance have impact on the discharging current of lithium battery group, limits the numerical value of discharging current.
Summary of the invention
The invention provides a kind of lithium battery group charge and discharge device, to realize quick charge, during electric discharge, lithium cells is in parallel, and lithium battery group can heavy-current discharge.
Embodiments provide a kind of lithium battery group charge and discharge device, comprising: at least two lithium cells, under lithium battery group charged state, are connected serially to power supply by described charge connector and charge by charge connector and electric discharge connector;
Under lithium battery group discharge condition, by described electric discharge connector, at least two lithium cells are connected in parallel to load and discharge.
Further, described lithium battery group charge and discharge device, also comprises: sampling connector and battery protecting apparatus;
Described sampling connector comprises: at least two positive pole sample line and a negative pole sample line;
The first end of each described positive pole sample line is connected with the positive pole of each described lithium cells, and the first end of described negative pole sample line is connected with the negative pole of lithium cells described in last during series connection;
Described battery protecting apparatus is used for the electrical parameter being obtained described lithium cells by described sampling connector.
Further, described battery protecting apparatus, comprising:
Charge protection device, be connected with the second end of described positive pole sample line and the second end of described negative pole sample line, for under described lithium battery group charged state, obtain the positive and negative voltage across poles of lithium cells described in each, and carry out charge protection according to described positive and negative voltage across poles;
Discharge protector; be connected with the second end of described negative pole sample line with the second end of described positive pole sample line; for under described lithium battery group discharge condition, obtain the positive and negative voltage across poles of described lithium battery group, and carry out discharge prevention according to described positive and negative voltage across poles.
Further, described charge protection device, comprising: charge protection chip and P channel metal-oxide field effect transistor PMOS;
The voltage detection terminal of described charge protection chip is connected with the second end of described positive pole sample line by the first resistance;
The negative supply input terminal of described charge protection chip and the charging of described charge protection device are born pin and are connected with the second end of described negative pole sample line respectively by the second resistance and the 3rd resistance;
The positive supply input terminal of described charge protection chip is connected with the second end of first described positive pole sample line;
Described PMOS is connected between the positive pin of charging of described charge protection device and the second end of first described positive pole sample line; its grid is connected by the charging control terminal of the 4th resistance with described charge protection chip with source electrode; for under described lithium battery group charged state; the positive and negative voltage across poles of the arbitrary described lithium cells got when described charge protection device is more than or equal to the first predeterminated voltage; then turn off described PMOS by the charging control terminal of described charge protection chip, stop described lithium battery group charging.
Further, described discharge protector, comprising: discharge prevention chip and N channel metal-oxide field effect transistor NMOS;
The positive supply input terminal of described discharge prevention chip is connected with the second end of described positive pole sample line by the 5th resistance, and is connected by the negative supply input terminal of electric capacity with described discharge prevention chip;
The negative supply input terminal of described discharge prevention chip is connected with the second end of described negative pole sample line;
The electric discharge of negative supply input terminal and described discharge protector that described NMOS tube is connected on described discharge prevention chip is born between pin; its grid is connected with the control of discharge terminal of described discharge prevention chip; for under described lithium battery group discharge condition; the positive and negative voltage across poles of the described lithium battery group obtained when described discharge protector is less than or equal to the second predeterminated voltage; then turn off described NMOS tube by the control of discharge terminal of described control of discharge chip, stop described lithium battery group to discharge.
Further, described charge connector comprises: the first positive pole connects pin, the first negative pole connects pin, charge positive pole pin and charging negative pole pin;
Described first positive pole connects pin, few one of the quantity of lithium cells described in its number ratio, and the positive pole of described lithium cells when its one end and series connection beyond first described lithium cells is connected;
Described first negative pole connects pin, and the quantity that its quantity is connected pin with described positive pole is identical, and the negative pole of described lithium cells when its one end and series connection beyond lithium cells described in last is connected;
The other end that described first positive pole connects pin the is connected pin other end with described first negative pole adjacent before it connects, thus by described at least two lithium cells series connection;
Described charging positive pole pin, its one end is connected with the positive pin of the charging of described charge protection device, and the other end is connected with the positive pole of described power supply;
Described charging negative pole pin, its one end is born pin with the charging of described charge protection device and is connected, and the other end is connected with the negative pole of described power supply.
Further, described electric discharge connector comprises: the second positive pole connects pin, the second negative pole connects pin and electric discharge negative pole pin;
Described second positive pole connects pin, its quantity is identical with the quantity of described lithium cells, and the positive pole of its one end and each described lithium cells connects one to one, and its other end is interconnected, and under described lithium battery group discharge condition, the positive pole as described lithium battery group is connected with described load;
Described second negative pole connects pin, and its quantity is identical with the quantity of described lithium cells, and the negative pole of its one end and each described lithium cells connects one to one, and its other end is interconnected;
One end of described electric discharge negative pole pin is born pin with the electric discharge of described discharge protector and is connected, and the other end is under described lithium battery group discharge condition, and the negative pole as described lithium battery group is connected with described load.
The present invention is charged to power supply by series connection at least two lithium cells, parallel connection at least two lithium cells are discharged to load, solve the problem that lithium battery group can not carry out heavy-current discharge, realize the quick charge of lithium battery group, and the effect of energy heavy-current discharge.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of lithium battery group charge and discharge device in the embodiment of the present invention one;
Fig. 2 is the structural representation of a kind of lithium battery group charge and discharge device in the embodiment of the present invention one;
Fig. 3 is the structural representation of a kind of lithium battery group charge and discharge device in the embodiment of the present invention two;
Fig. 4 is the structural representation of a kind of lithium battery group charge and discharge device in the embodiment of the present invention two;
Fig. 5 is the structural representation of a kind of lithium battery group charge and discharge device in the embodiment of the present invention two;
Fig. 6 is the circuit diagram of a kind of lithium battery group charge and discharge device in the embodiment of the present invention three.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not entire infrastructure.
Embodiment one
Fig. 1 and Fig. 2 is the structural representation of a kind of lithium battery group charge and discharge device that the embodiment of the present invention one provides, the present embodiment is applicable to the situation of the lithium battery group discharge and recharge comprising at least two lithium cells, preferably, this device is applicable to the situation of the lithium battery group discharge and recharge comprising 2-4 lithium cells.
Described lithium battery group charge and discharge device 20, comprising: charge connector 201 and electric discharge connector 202, for the discharge and recharge of lithium battery group 10.As shown in Figure 1, under lithium battery group 10 charged state, by described charge connector 201, at least two lithium cells 101 are connected serially to power supply 30 and charge; As shown in Figure 2, under lithium battery group 10 discharge condition, by described electric discharge connector 202, at least two lithium cells 101 are connected in parallel to load 40 and discharge.
Wherein, the specification of single lithium cells 101 is identical, under lithium battery group 10 charged state, each lithium cells 101 is connected by charge connector 201 successively, in lithium cells 101 after series connection, the positive pole of the just very lithium battery group 10 of first lithium cells 101, the negative pole of last lithium cells 101 is the negative pole of lithium battery group 10, the both positive and negative polarity of lithium battery group 10 is connected to the both positive and negative polarity of power supply 30 by charge connector 201, thus charges to lithium battery group 10.Under lithium battery group 10 discharge condition, electric discharge connector 202 is in parallel by each lithium cells 101, the positive pole of the just very lithium battery group 10 of lithium cells 101 in parallel, the negative pole of lithium cells 101 in parallel is the negative pole of lithium battery group 10, the both positive and negative polarity of electric discharge connector 202 just lithium battery group 10 is connected in load 40, and lithium battery group 10 is discharged.Preferably, charge connector 201 and electric discharge connector 202 are structurally made into mutual interference, and namely insert one of them, another then can not be connected with lithium battery group 10, avoid the circuit mistake caused because of operate miss to connect.
The technical scheme of the present embodiment, under lithium battery group charging and discharging state respectively by charge connector and electric discharge connector by lithium cells series and parallel connections, realize the quick charge of lithium battery group and heavy-current discharge.
Embodiment two
Fig. 3 is the structural representation of a kind of lithium battery group charge and discharge device that embodiment two provides, the technical scheme that the present embodiment provides is at the enterprising one-step optimization in the basis of above-described embodiment, preferably, lithium battery group charge and discharge device 20 also comprises: sampling connector 203 and battery protecting apparatus 204; Described sampling connector 203 comprises: at least two positive pole sample line and a negative pole sample line; The first end of each described positive pole sample line is connected with the positive pole of each described lithium cells, and the first end of described negative pole sample line is connected with the negative pole of lithium cells described in last during series connection; Described battery protecting apparatus 20 is for obtaining the electrical parameter of described lithium cells by described sampling connector 203.
Wherein, lithium cells in the positive pole sample line of sampling connector 203 and lithium battery group 10 connects one to one; battery protecting apparatus 204 obtains the electrical parameter of lithium cells by sampling connector 203; wherein electrical parameter comprises the positive and negative voltage across poles of single lithium cells; and control according to the discharge and recharge of electrical parameter to lithium battery group 10 obtained, avoid lithium battery group 10 to occur overcharging or crossing putting phenomenon.
Further, described battery protecting apparatus 204, comprising:
Charge protection device, be connected with the second end of described positive pole sample line and the second end of described negative pole sample line, for under described lithium battery group charged state, obtain the positive and negative voltage across poles of lithium cells described in each, and carry out charge protection according to described positive and negative voltage across poles;
Discharge protector; be connected with the second end of described negative pole sample line with the second end of described positive pole sample line; for under described lithium battery group discharge condition, obtain the positive and negative voltage across poles of described lithium battery group, and carry out discharge prevention according to described positive and negative voltage across poles.
Wherein, lithium battery group in the charge state; lithium cells is connected mutually; namely the negative pole of previous lithium cells is connected with the positive pole of the lithium cells of its rear adjacent; charge protection device is connected with the second end of described positive pole sample line and the second end of described negative pole sample line, can obtain the positive and negative voltage across poles of each lithium cells.
Further, described charge protection device, comprising: charge protection chip and P channel metal-oxide field effect transistor PMOS;
The voltage detection terminal of described charge protection chip is connected with the second end of described positive pole sample line by the first resistance;
The negative supply input terminal of described charge protection chip and the charging of described charge protection device are born pin and are connected with the second end of described negative pole sample line respectively by the second resistance and the 3rd resistance;
The positive supply input terminal of described charge protection chip is connected with the second end of first described positive pole sample line;
Described PMOS is connected between the positive pin of charging of described charge protection device and the second end of first described positive pole sample line; its grid is connected by the charging control terminal of the 4th resistance with described charge protection chip with source electrode; for under described lithium battery group charged state; the positive and negative voltage across poles of the arbitrary described lithium cells got when described charge protection device is more than or equal to the first predeterminated voltage; then turn off described PMOS by the charging control terminal of described charge protection chip, stop described lithium battery group charging.
Wherein, charge protection chip is lithium battery group privacy protection chip, by its surrounding hardware circuit and software merit rating, for the protection of the charging of the lithium battery group of certain voltage value scope.The voltage detection terminal of charge protection chip and the positive pole one_to_one corresponding of each lithium cells, charge protection chip obtains the positive and negative voltage across poles of single lithium cells by voltage detection terminal and negative supply input terminal.First predeterminated voltage is that overcharge detects protection pressure, when the positive and negative voltage across poles of single lithium cells reaches the first predeterminated voltage, will carry out charge protection to lithium battery group, stops, to the charging of lithium battery group, avoiding overcharging and damaging lithium battery.
Further, discharge protector, comprising: discharge prevention chip and N channel metal-oxide field effect transistor NMOS;
The positive supply input terminal of described discharge prevention chip is connected with the second end of described positive pole sample line by the 5th resistance, and is connected by the negative supply input terminal of electric capacity with described discharge prevention chip;
The negative supply input terminal of described discharge prevention chip is connected with the second end of described negative pole sample line;
The electric discharge of negative supply input terminal and described discharge protector that described NMOS tube is connected on described discharge prevention chip is born between pin; its grid is connected with the control of discharge terminal of described discharge prevention chip; for under described lithium battery group discharge condition; the positive and negative voltage across poles of the described lithium battery group obtained when described discharge protector is less than or equal to the second predeterminated voltage; then turn off described NMOS tube by the control of discharge terminal of described control of discharge chip, stop described lithium battery group to discharge.
Wherein, discharge prevention chip is lithium battery group privacy protection chip, by its surrounding hardware circuit and software merit rating, for the protection of the electric discharge of the lithium battery group of certain voltage value scope.Because lithium battery group in the discharged condition, each lithium cells is parallel with one another, so select the privacy protection chip protecting single lithium cells.Discharge prevention chip obtains the positive and negative voltage across poles of lithium battery group by its positive supply input terminal and negative supply input terminal.Second predeterminated voltage is that overdischarge detects voltage, and under discharge condition, when between the both positive and negative polarity of lithium battery group, voltage drop is to the second predeterminated voltage, will carry out discharge prevention, and stop load discharge, avoided putting and damaging lithium battery to lithium battery group.
Further, described charge connector comprises: the first positive pole connects pin, the first negative pole connects pin, charge positive pole pin and charging negative pole pin; Described first positive pole connects pin, few one of the quantity of lithium cells described in its number ratio, and the positive pole of described lithium cells when its one end and series connection beyond first described lithium cells is connected; Described first negative pole connects pin, and the quantity that its quantity is connected pin with described positive pole is identical, and the negative pole of described lithium cells when its one end and series connection beyond lithium cells described in last is connected; The other end that described first positive pole connects pin the is connected pin other end with described first negative pole adjacent before it connects, thus by described at least two lithium cells series connection; Described charging positive pole pin, its one end is connected with the positive pin of the charging of described charge protection device, and the other end is connected with the positive pole of external power supply; Described charging negative pole pin, its one end is born pin with the charging of described charge protection device and is connected, and the other end is connected with the negative pole of external power supply.
Wherein, charge connector is connected pin by its first positive pole connection pin with the first negative pole and each lithium cells is connected, and by charging positive pole pin and charging negative pole pin, the both positive and negative polarity of power supply is connected on the both positive and negative polarity of lithium battery group, thus lithium battery group is charged.Example, as shown in Figure 4, lithium battery group 10 comprises 3 lithium cells 101,102 and 103, the pin 1 and 2 of charge connector 205 is that the first positive pole is connected pin, pin 3 and 4 is that the first negative pole is connected pin, and pin 5 is charging positive pole pin, and pin 6 is charging negative pole pin.Charge protection device 206 is connected (sampling connector is for illustrating) with the positive pole of the 1st lithium cells 101 and the negative pole of the 3rd lithium cells 103 respectively by sampling connector.Pin 1 is connected with the positive pole of the 2nd lithium cells 102; pin 2 is connected with the positive pole of the 3rd lithium cells 103; pin 3 is connected with the negative pole of the 1st lithium cells; pin 4 is connected with the negative pole of the 2nd lithium cells 102; one end of pin 5 is connected with the positive pin of the charging of charge protection device 206; the other end is connected with the positive pole of external power supply 30, and one end of pin 6 is born pin with the charging of charge protection device 206 and is connected, and the other end is connected with the negative pole of external power supply 30.
Further, described electric discharge connector comprises: the second positive pole connects pin, the second negative pole connects pin and electric discharge negative pole pin; Described second positive pole connect pin, its quantity is identical with the quantity of described lithium cells, and the positive pole of its one end and each described lithium cells connects one to one, and its other end is interconnected, and as discharge time described lithium battery group positive pole; Described second negative pole connects pin, and its quantity is identical with the quantity of described lithium cells, and the negative pole of its one end and each described lithium cells connects one to one, and its other end is interconnected; Described electric discharge negative pole pin is born pin with the electric discharge of described discharge protector and is connected, as the negative pole of described lithium battery group during electric discharge.Example, shown in Fig. 5, lithium battery group 10 comprises 3 lithium cells 101,102 and 103, and the pin 1-3 of electric discharge connector 207 is that the second positive pole connects pin, and pin 4-6 is that the second negative pole connects pin, and pin 7 is electric discharge negative pole pin.Pin 1, pin 2 are connected with the positive pole of the positive pole of the 1st lithium cells 101, the positive pole of the 2nd lithium cells 102 and the 3rd lithium cells 103 respectively with one end of pin 3, the other end of pin 1, pin 2 and pin 3 is interconnected, and positive pole when discharging as lithium battery group 10 is connected with load 40.Pin 4, pin 5 are connected with the negative pole of the negative pole of the 1st lithium cells 101, the negative pole of the 2nd lithium cells 102 and the 3rd lithium cells 103 respectively with one end of pin 6, and the other end of pin 4, pin 5 and pin 6 is interconnected.One end of pin 7 is born pin with the electric discharge of discharge protector 208 and is connected, and the negative pole when other end of pin 7 discharges as lithium battery group 10 is connected with load 40.
Wherein, electric discharge connector connects pin by its second positive pole and is connected pin with the second negative pole by each lithium cells parallel connection, and load be connected on the both positive and negative polarity of lithium battery group by charging positive pole pin and charging negative pole pin, thus realize lithium battery group to load discharge.
The technical scheme that the present embodiment provides; under the charged state and discharge condition of lithium battery group; lithium cells is connected with electric discharge connector respectively by charge connector; obtained the relevant electrical parameter of lithium battery group by sampling connector by battery protecting apparatus; the charge and discharge process of lithium battery group is protected, avoids occurring overcharging and crossing putting phenomenon.
Embodiment three
Fig. 6 is the circuit diagram of a kind of lithium battery group charge and discharge device that embodiment three provides, and the technical scheme that the present embodiment provides is the preferred embodiment on the basis of above-described embodiment, and the technical program is applicable to the lithium battery group of 3 lithium cells compositions.
As shown in Figure 6, lithium battery group charge and discharge device comprises: charge protection device, discharge protector, sampling connector, charge connector and electric discharge connector.
Wherein, under lithium battery group charged state, the lithium cells of series connection, according to the order from the negative pole of lithium battery group to positive pole, is followed successively by the first lithium cells, the second lithium cells and the 3rd lithium cells.The pin 1 of sampling connector is negative pole sample line, it connects the negative pole of the first lithium cells, the pin 2-4 of sampling connector is positive pole sample line, pin 2 connects the positive pole of the first lithium cells, pin 3 connects the positive pole of the second lithium cells, and pin 3 connects the positive pole of the 3rd lithium cells.
When lithium battery group is charged, one end of the pin 3 of charge connector connects the positive pole of the first lithium cells, one end of the pin 4 of charge connector connects the negative pole of the second lithium cells, one end of the pin 5 of charge connector connects the positive pole of the second lithium cells, one end of the pin 6 of charge connector connects the negative pole of the 3rd lithium cells, the other end of the pin 3 of charge connector is connected with the other end of the pin 4 of charge connector, the other end of the pin 5 of charge connector is connected with the other end of the pin 6 of charge connector, thus by charge connector, lithium cells is connected.
Charge protection device comprises: charge protection chip U1 and PMOS M1; the pin 13 of charge protection chip U1; pin 14 and pin 15 are its voltage detection terminal, and are connected respectively by the pin 2 of resistance R1, resistance R2 and resistance R3 and sampling connector, pin 3 and pin 4.The pin 7 of charge protection chip U1 is its negative supply input terminal, and is connected with the pin 1 of sampling connector by resistance R4.The pin 16 of charge protection chip U1 is its positive supply input terminal, and is connected with the pin 4 of sampling connector.As shown in Figure 6; the positive supply input terminal of charge protection chip U1 is connected with voltage detection terminal and negative supply input terminal respectively by electric capacity C1-C4, and charge protection chip U1 obtains the positive and negative voltage across poles of single lithium cells by positive supply input terminal, negative supply input terminal and voltage detection terminal.
The charging of charge protection device is born pin C-and is connected with the pin 1 of sampling connector by resistance R5, and the positive pin C+ of charging of charge protection device is connected with the pin 4 of sampling connector by PMOS M1.The positive pin C+ of charging of charge protection device is connected with the pin 7 of charge connector and pin 8, and is connected to the positive pole of charge power supply by the pin 7 of charge connector and pin 8; The pin 1 of pin C-and charge connector is born in the charging of charge protection device and pin 2 is connected, and is connected to the negative pole of charge power supply by the pin 1 of charge connector and pin 2.Wherein, the pin 1 of charge connector is all born pin C-with the charging of charge protection device with pin 2 and is connected; the resistance in order to reduce wire; and increasing the current carrying capacity of wire when charging, the pin 7 of charge connector is identical with the effect of pin 2 with the pin 1 of charge connector with the effect of pin 8.The grid of PMOS M1 is connected with the pin 1 of charge protection chip U1 by resistance R6 with source electrode, and the pin 1 of charge protection chip U1 is charging control terminal.Under lithium battery group charged state; the positive and negative voltage across poles of the arbitrary lithium cells got when charge protection device is more than or equal to overcharge and detects protection pressure; then turn off PMOS M1 by the charging control terminal of charge protection chip U1; stop described lithium battery group charging; thus the charge protection reached lithium battery group, avoid overcharging phenomenon.
When lithium battery group is discharged, one end of the pin 1-3 of electric discharge connector is connected with the negative pole of the negative pole of the first lithium cells, the negative pole of the second lithium cells and the 3rd lithium cells respectively, and the other end of the pin 1-3 of electric discharge connector is interconnected; One end of the pin 7-9 of electric discharge connector is connected with the positive pole of the positive pole of the first lithium cells, the positive pole of the second lithium cells and the 3rd lithium cells respectively, the other end of the pin 7-9 of electric discharge connector is interconnected, thus lithium cells is in parallel, under lithium battery group discharge condition, the other end of the pin 7-9 of electric discharge connector is connected with load, as the positive pole under lithium battery group discharge condition.
Discharge protector comprises: discharge prevention chip U2, NMOS tube M2 and NMOS tube M3; the pin 5 of discharge prevention chip U2 is its positive supply input terminal; and be connected with the pin 2 of sampling connector by resistance R11; the pin 6 of discharge prevention chip U2 is its negative supply input terminal; and be connected with the pin 1 of sampling connector; the pin 5 of discharge prevention chip U2 is connected by electric capacity C8 with pin 6, and discharge prevention chip U2 obtains the positive and negative voltage across poles of lithium cells in parallel by its pin 5 and pin 6.
The electric discharge of the negative supply input terminal and discharge protector that are connected on discharge prevention chip U2 after NMOS tube M2 and NMOS tube M3 is parallel with one another is born between pin P-; the grid of NMOS tube M2 is connected with the pin 1 of the grid of NMOS tube M3 with discharge prevention chip U2, and the pin 1 of discharge prevention chip U2 is its control of discharge terminal.One end of pin 4-6 of electric discharge connector is born pin P-with the electric discharge of discharge protector and is connected, and the other end of the pin 4-6 of electric discharge connector is connected with load, and as the negative pole under lithium battery group discharge condition.Under lithium battery group discharge condition; when the positive and negative voltage across poles of the lithium battery group of discharge protector acquisition is less than or equal to overdischarge detection voltage; then turn off NMOS tube M2 and NMOS tube M3 by the control of discharge terminal of control of discharge chip U2, stop described lithium battery group to discharge, avoided putting phenomenon.
The said goods can perform the method that any embodiment of the present invention provides, and possesses the corresponding functional module of manner of execution and beneficial effect.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.

Claims (7)

1. a lithium battery group charge and discharge device, comprising: charge connector and electric discharge connector, is characterized in that:
Under lithium battery group charged state, by described charge connector, at least two lithium cells are connected serially to power supply and charge;
Under lithium battery group discharge condition, by described electric discharge connector, at least two lithium cells are connected in parallel to load and discharge.
2. lithium battery group charge and discharge device according to claim 1, is characterized in that, also comprise: sampling connector and battery protecting apparatus;
Described sampling connector comprises: at least two positive pole sample line and a negative pole sample line;
The first end of each described positive pole sample line is connected with the positive pole of each described lithium cells, and the first end of described negative pole sample line is connected with the negative pole of lithium cells described in last during series connection;
Described battery protecting apparatus is used for the electrical parameter being obtained described lithium cells by described sampling connector.
3. lithium battery group charge and discharge device according to claim 2, it is characterized in that, described battery protecting apparatus, comprising:
Charge protection device, be connected with the second end of described positive pole sample line and the second end of described negative pole sample line, for under described lithium battery group charged state, obtain the positive and negative voltage across poles of lithium cells described in each, and carry out charge protection according to described positive and negative voltage across poles;
Discharge protector; be connected with the second end of described negative pole sample line with the second end of described positive pole sample line; for under described lithium battery group discharge condition, obtain the positive and negative voltage across poles of described lithium battery group, and carry out discharge prevention according to described positive and negative voltage across poles.
4. lithium battery group charge and discharge device according to claim 3, it is characterized in that, described charge protection device, comprising: charge protection chip and P channel metal-oxide field effect transistor PMOS;
The voltage detection terminal of described charge protection chip is connected with the second end of described positive pole sample line by the first resistance;
The negative supply input terminal of described charge protection chip and the charging of described charge protection device are born pin and are connected with the second end of described negative pole sample line respectively by the second resistance and the 3rd resistance;
The positive supply input terminal of described charge protection chip is connected with the second end of first described positive pole sample line;
Described PMOS is connected between the positive pin of charging of described charge protection device and the second end of first described positive pole sample line; its grid is connected by the charging control terminal of the 4th resistance with described charge protection chip with source electrode; for under described lithium battery group charged state; the positive and negative voltage across poles of the arbitrary described lithium cells got when described charge protection device is more than or equal to the first predeterminated voltage; then turn off described PMOS by the charging control terminal of described charge protection chip, stop described lithium battery group charging.
5. lithium battery group charge and discharge device according to claim 4, it is characterized in that, described discharge protector, comprising:
Discharge prevention chip and N channel metal-oxide field effect transistor NMOS;
The positive supply input terminal of described discharge prevention chip is connected with the second end of described positive pole sample line by the 5th resistance, and is connected by the negative supply input terminal of electric capacity with described discharge prevention chip;
The negative supply input terminal of described discharge prevention chip is connected with the second end of described negative pole sample line;
The electric discharge of negative supply input terminal and described discharge protector that described NMOS tube is connected on described discharge prevention chip is born between pin; its grid is connected with the control of discharge terminal of described discharge prevention chip; for under described lithium battery group discharge condition; the positive and negative voltage across poles of the described lithium battery group obtained when described discharge protector is less than or equal to the second predeterminated voltage; then turn off described NMOS tube by the control of discharge terminal of described control of discharge chip, stop described lithium battery group to discharge.
6. lithium battery group charge and discharge device according to claim 4, it is characterized in that, described charge connector comprises: the first positive pole connects pin, the first negative pole connects pin, charge positive pole pin and charging negative pole pin;
Described first positive pole connects pin, few one of the quantity of lithium cells described in its number ratio, and the positive pole of described lithium cells when its one end and series connection beyond first described lithium cells is connected;
Described first negative pole connects pin, and the quantity that its quantity is connected pin with described positive pole is identical, and the negative pole of described lithium cells when its one end and series connection beyond lithium cells described in last is connected;
The other end that described first positive pole connects pin the is connected pin other end with described first negative pole adjacent before it connects, thus by described at least two lithium cells series connection;
Described charging positive pole pin, its one end is connected with the positive pin of the charging of described charge protection device, and the other end is connected with the positive pole of described power supply;
Described charging negative pole pin, its one end is born pin with the charging of described charge protection device and is connected, and the other end is connected with the negative pole of described power supply.
7. lithium battery group charge and discharge device according to claim 5, is characterized in that, described electric discharge connector comprises: the second positive pole connects pin, the second negative pole connects pin and electric discharge negative pole pin;
Described second positive pole connects pin, its quantity is identical with the quantity of described lithium cells, and the positive pole of its one end and each described lithium cells connects one to one, and its other end is interconnected, and under described lithium battery group discharge condition, the positive pole as described lithium battery group is connected with described load;
Described second negative pole connects pin, and its quantity is identical with the quantity of described lithium cells, and the negative pole of its one end and each described lithium cells connects one to one, and its other end is interconnected;
One end of described electric discharge negative pole pin is born pin with the electric discharge of described discharge protector and is connected, and the other end is under described lithium battery group discharge condition, and the negative pole as described lithium battery group is connected with described load.
CN201510835160.2A 2015-11-25 2015-11-25 A kind of lithium battery group charge and discharge device CN105322620B (en)

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