CN105322620B - A kind of lithium battery group charge and discharge device - Google Patents

A kind of lithium battery group charge and discharge device Download PDF

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Publication number
CN105322620B
CN105322620B CN201510835160.2A CN201510835160A CN105322620B CN 105322620 B CN105322620 B CN 105322620B CN 201510835160 A CN201510835160 A CN 201510835160A CN 105322620 B CN105322620 B CN 105322620B
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discharge
pin
charge
lithium
lithium battery
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CN105322620A (en
Inventor
王冬文
刘金成
吕正中
葛辉明
余小文
秦忠荣
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Eve Energy Co Ltd
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Eve Energy Co Ltd
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Abstract

The invention discloses a kind of lithium battery group charge and discharge devices, including:At least two lithium cells are connected serially to power supply by the charge connector and charged by charge connector and electric discharge connector under lithium battery group charged state;Under lithium battery group discharge condition, at least two lithium cells are connected in parallel to by load by the electric discharge connector and are discharged.Under lithium battery group charged state provided in an embodiment of the present invention, lithium battery group quick charge may be implemented in lithium cells series connection;Under discharge condition, lithium cells are in parallel, and the internal resistance of lithium battery group is less than the internal resistance of any lithium cells, and lithium battery group heavy-current discharge may be implemented in the internal resistance reduction of lithium battery group.

Description

A kind of lithium battery group charge and discharge device
Technical field
The present embodiments relate to lithium battery technology more particularly to a kind of lithium battery group charge and discharge devices.
Background technology
Nowadays, lithium battery applications range is wider, larger for lithium battery group usage amount in social all trades and professions.
Currently, mainly using each lithium cells series-connection charge-discharge during lithium battery group use.When each in lithium battery When a lithium cells discharged in series, the sum of the internal resistance of lithium cells that the internal resistance of lithium battery group is included for it is larger Internal resistance affects the discharge current of lithium battery group, limits the numerical value of discharge current.
Invention content
The present invention provides a kind of lithium battery group charge and discharge device, and to realize quick charge, lithium cells are in parallel when electric discharge, Lithium battery group can be large current discharge.
An embodiment of the present invention provides a kind of lithium battery group charge and discharge devices, including:Charge connector and electric discharge connector, Under lithium battery group charged state, at least two lithium cells are connected serially to by power supply by the charge connector and are filled Electricity;
Under lithium battery group discharge condition, at least two lithium cells are connected in parallel to by load by the electric discharge connector It discharges.
Further, the lithium battery group charge and discharge device further includes:Sampling connector and battery protecting apparatus;
The sampling connector includes:At least two anode sampling lines and a cathode sample line;
The anode connection of the first end and each lithium cells of each anode sampling line, the cathode sampling The first end of line is connected with the cathode of the last one lithium cells when series connection;
The battery protecting apparatus is used to obtain the electrical parameter of the lithium cells by the sampling connector.
Further, the battery protecting apparatus, including:
Charge protection device, the second end that line is sampled with the second end of the anode sampling line and the cathode are connect, For under the lithium battery group charged state, obtaining the positive and negative voltage across poles of each lithium cells, and according to described Positive and negative voltage across poles carries out charge protection;
Discharge protector, the second end that line is sampled with the second end of the anode sampling line with the cathode connect, use In under the lithium battery group discharge condition, obtaining the positive and negative voltage across poles of the lithium battery group, and according to the positive and negative interpolar Voltage carries out discharge prevention.
Further, the charge protection device, including:Charge protection chip and P-channel metal-oxide-semiconductor field effect t PMOS;
The second end that the voltage detection terminal of the charge protection chip samples line by first resistor with the anode connects It connects;
Pin difference is born in the charging of the negative supply input terminal and the charge protection device of the charge protection chip The second end for sampling line with the cathode by second resistance and 3rd resistor is connect;
The positive supply input terminal of the charge protection chip is connect with the second end of first anode sampling line;
The PMOS tube is connected on the positive pin of charging of the charge protection device and first anode samples line Between second end, grid is connected by the 4th resistance with the charge control terminal of the charge protection chip with source electrode, is used for Under the lithium battery group charged state, when the positive and negative anodes for any lithium cells that the charge protection device is got Between voltage be more than or equal to the first predeterminated voltage, then pass through the charge control terminal of the charge protection chip and turn off the PMOS Pipe stops charging to the lithium battery group.
Further, the discharge protector, including:Discharge prevention chip and N-channel metal-oxide-semiconductor field effect t NMOS;
The positive supply input terminal of the discharge prevention chip samples the second end of line by the 5th resistance with the anode Connection, and connect with the negative supply input terminal of the discharge prevention chip by capacitance;
The second end that the negative supply input terminal of the discharge prevention chip samples line with the cathode is connect;
The NMOS tube is connected on the negative supply input terminal of the discharge prevention chip and the discharge protector Between pin is born in electric discharge, grid is connected with the control of discharge terminal of the discharge prevention chip, in the lithium battery group Under discharge condition, preset when the positive and negative voltage across poles for the lithium battery group that the discharge protector obtains is less than or equal to second Voltage then turns off the NMOS tube by the control of discharge terminal of the control of discharge chip, stops the lithium battery group electric discharge.
Further, the charge connector includes:First anode connection pin, the first cathode connection pin, charging are just Pole pin and charging negative pin;
The first anode connection pin, one fewer than the quantity of the lithium cells of quantity, one end and series connection When first lithium cells other than the lithium cells anode connection;
First cathode connects pin, and quantity is identical with the quantity of the anode connection pin, one end and series connection When the last one described lithium cells other than the lithium cells cathode connection;
The other end of the first anode connection pin connects the other end of pin with adjacent first cathode before it Connection, to which at least two lithium cells be connected;
The positive pin of the charging, one end are connected with the positive pin of the charging of the charge protection device, the other end and institute State the anode connection of power supply;
The charging negative pin, one end and the charging of the charge protection device are born pin and are connected, the other end and institute State the cathode connection of power supply.
Further, the electric discharge connector includes:Second anode connection pin, the second cathode connection pin and electric discharge are negative Pole pin;
The second anode connection pin, quantity is identical with the quantity of the lithium cells, one end and each described The anode of lithium cells connects one to one, and the other end is connected with each other, and under the lithium battery group discharge condition, as The anode of the lithium battery group and load connection;
Second cathode connects pin, and quantity is identical with the quantity of the lithium cells, one end and each described The cathode of lithium cells connects one to one, and the other end is connected with each other;
One end of the electric discharge negative pin is born pin with the electric discharge of the discharge protector and is connected, and the other end is described Under lithium battery group discharge condition, connected as the cathode of the lithium battery group and the load.
The present invention is charged by least two lithium cells to power supply of connecting, at least two lithium cells in parallel It discharges to load, solves the problems, such as that lithium battery group cannot be large current discharge, realize lithium battery group quick charge, and energy The effect of heavy-current discharge.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of lithium battery group charge and discharge device in the embodiment of the present invention one;
Fig. 2 is a kind of structural schematic diagram of lithium battery group charge and discharge device in the embodiment of the present invention one;
Fig. 3 is a kind of structural schematic diagram of lithium battery group charge and discharge device in the embodiment of the present invention two;
Fig. 4 is a kind of structural schematic diagram of lithium battery group charge and discharge device in the embodiment of the present invention two;
Fig. 5 is a kind of structural schematic diagram of lithium battery group charge and discharge device in the embodiment of the present invention two;
Fig. 6 is a kind of circuit diagram of lithium battery group charge and discharge device in the embodiment of the present invention three.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 and Fig. 2 is a kind of structural schematic diagram for lithium battery group charge and discharge device that the embodiment of the present invention one provides, this Embodiment is applicable to the case where including the lithium battery group charge and discharge of at least two lithium cells, it is preferred that the device is applicable in In the lithium battery group charge and discharge including 2-4 lithium cells the case where.
The lithium battery group charge and discharge device 20, including:Charge connector 201 and electric discharge connector 202, are used for lithium battery The charge and discharge of group 10.As shown in Figure 1, under 10 charged state of lithium battery group, by the charge connector 201 by least two Lithium cells 101 are connected serially to power supply 30 and charge;As shown in Fig. 2, under 10 discharge condition of lithium battery group, put by described At least two lithium cells 101 are connected in parallel to load 40 and discharged by electric connector 202.
Wherein, the specification of single lithium cells 101 is identical, under 10 charged state of lithium battery group, charge connector 201 Each lithium cells 101 are sequentially connected in series, in the lithium cells 101 after series connection, first lithium cells 101 just extremely The anode of lithium battery group 10, the cathode of the last one lithium cells 101 are the cathode of lithium battery group 10, charge connector 201 The positive and negative anodes of lithium battery group 10 are connected to the positive and negative anodes of power supply 30, to charge to lithium battery group 10.It is put in lithium battery group 10 Under electricity condition, electric discharge connector 202 is in parallel by each lithium cells 101, the just extremely lithium battery of lithium cells 101 in parallel The anode of group 10, the cathode of lithium cells 101 in parallel are the cathode of lithium battery group 10, and electric discharge connector 202 will be by lithium electricity The positive and negative anodes of pond group 10 are connected in load 40, and lithium battery group 10 is discharged.Preferably, charge connector 201 and electric discharge connect It connects device 202 and structurally makes into and interfere, that is, be inserted in one of, another cannot then be connected with lithium battery group 10, be kept away Exempt from the circuit mistake caused by operation error to connect.
The technical solution of the present embodiment passes through charge connector and electric discharge respectively under lithium battery group charging and discharging state Lithium cells series connection and parallel connection are realized lithium battery group quick charge and heavy-current discharge by connector.
Embodiment two
Fig. 3 is a kind of structural schematic diagram for lithium battery group charge and discharge device that embodiment two provides, provided in this embodiment Technical solution is to advanced optimize on the basis of the above embodiments, it is preferred that lithium battery group charge and discharge device 20 further includes:It adopts Sample connector 203 and battery protecting apparatus 204;The sampling connector 203 includes:At least two anodes sample lines and one negative Pole samples line;The anode connection of the first end and each lithium cells of each anode sampling line, the cathode are adopted The first end of line-transect is connected with the cathode of the last one lithium cells when series connection;The battery protecting apparatus 20 is used for The electrical parameter of the lithium cells is obtained by the sampling connector 203.
Wherein, the lithium cells in the anode sampling line and lithium battery group 10 of sampling connector 203 connect one to one, Battery protecting apparatus 204 obtains the electrical parameter of lithium cells by sampling connector 203, and wherein electrical parameter includes single The positive and negative voltage across poles of lithium cells, and the charge and discharge of lithium battery group 10 are controlled according to the electrical parameter of acquisition, it keeps away Exempt from lithium battery group 10 to occur overcharging or crossing putting phenomenon.
Further, the battery protecting apparatus 204, including:
Charge protection device, the second end that line is sampled with the second end of the anode sampling line and the cathode are connect, For under the lithium battery group charged state, obtaining the positive and negative voltage across poles of each lithium cells, and according to described Positive and negative voltage across poles carries out charge protection;
Discharge protector, the second end that line is sampled with the second end of the anode sampling line with the cathode connect, use In under the lithium battery group discharge condition, obtaining the positive and negative voltage across poles of the lithium battery group, and according to the positive and negative interpolar Voltage carries out discharge prevention.
Wherein, in the charge state, lithium cells are serially connected lithium battery group, i.e., the cathode of previous lithium cells The anode connection of adjacent lithium cells, charge protection device sample second end and the institute of line with the anode behind The second end connection for stating cathode sampling line, can obtain the positive and negative voltage across poles of each lithium cells.
Further, the charge protection device, including:Charge protection chip and P-channel metal-oxide-semiconductor field effect t PMOS;
The second end that the voltage detection terminal of the charge protection chip samples line by first resistor with the anode connects It connects;
Pin difference is born in the charging of the negative supply input terminal and the charge protection device of the charge protection chip The second end for sampling line with the cathode by second resistance and 3rd resistor is connect;
The positive supply input terminal of the charge protection chip is connect with the second end of first anode sampling line;
The PMOS tube is connected on the positive pin of charging of the charge protection device and first anode samples line Between second end, grid is connected by the 4th resistance with the charge control terminal of the charge protection chip with source electrode, is used for Under the lithium battery group charged state, when the positive and negative anodes for any lithium cells that the charge protection device is got Between voltage be more than or equal to the first predeterminated voltage, then pass through the charge control terminal of the charge protection chip and turn off the PMOS Pipe stops charging to the lithium battery group.
Wherein, charge protection chip is lithium battery group privacy protection chip, by its surrounding hardware circuit and software configuration, Charging for the lithium battery group for protecting certain voltage value range.The voltage detection terminal of charge protection chip and each lithium battery list The anode of member corresponds, and charge protection chip obtains single lithium battery list by voltage detection terminal and negative supply input terminal The positive and negative voltage across poles of member.First predeterminated voltage is to overcharge electro-detection protection pressure, when the positive and negative interpolar electricity of single lithium cells Pressure reaches the first predeterminated voltage, and charge protection will be carried out to lithium battery group, stops charging to lithium battery group, avoids overcharging and damaging Lithium battery.
Further, discharge protector, including:Discharge prevention chip and N-channel metal-oxide-semiconductor field effect t NMOS;
The positive supply input terminal of the discharge prevention chip samples the second end of line by the 5th resistance with the anode Connection, and connect with the negative supply input terminal of the discharge prevention chip by capacitance;
The second end that the negative supply input terminal of the discharge prevention chip samples line with the cathode is connect;
The NMOS tube is connected on the negative supply input terminal of the discharge prevention chip and the discharge protector Between pin is born in electric discharge, grid is connected with the control of discharge terminal of the discharge prevention chip, in the lithium battery group Under discharge condition, preset when the positive and negative voltage across poles for the lithium battery group that the discharge protector obtains is less than or equal to second Voltage then turns off the NMOS tube by the control of discharge terminal of the control of discharge chip, stops the lithium battery group electric discharge.
Wherein, discharge prevention chip is lithium battery group privacy protection chip, by its surrounding hardware circuit and software configuration, Electric discharge for the lithium battery group for protecting certain voltage value range.Because lithium battery group is in the discharged condition, each lithium cells It is parallel with one another, so selecting the privacy protection chip for protecting single lithium cells.Discharge prevention chip is defeated by its positive supply Enter terminal and negative supply input terminal obtains the positive and negative voltage across poles of lithium battery group.Second predeterminated voltage is overdischarge detection electricity Pressure under discharge condition, when the positive and negative voltage across poles of lithium battery group drops to the second predeterminated voltage, will discharge to lithium battery group Protection stops, to load discharge, avoiding putting and damaging lithium battery.
Further, the charge connector includes:First anode connection pin, the first cathode connection pin, charging are just Pole pin and charging negative pin;The first anode connection pin, one fewer than the quantity of the lithium cells of quantity, The anode connection of lithium cells when one end and series connection other than first lithium cells;First cathode Pin is connected, quantity is identical with the quantity of the anode connection pin, one end and the last one described lithium battery when connecting The cathode of the lithium cells other than unit connects;The other end of the first anode connection pin and institute adjacent before it The other end connection for stating the first cathode connection pin, to which at least two lithium cells be connected;The charging anode Pin, one end are connected with the positive pin of the charging of the charge protection device, the anode connection of the other end and external power supply;It is described Charge negative pin, and one end is born pin with the charging of the charge protection device and connected, the cathode of the other end and external power supply Connection.
Wherein, charge connector connects pin by each lithium cells by its first anode connection pin and the first cathode Series connection, and the positive and negative anodes of power supply are connected on the positive and negative anodes of lithium battery group by charge positive pin and charging negative pin, To charge to lithium battery group.It is exemplary, as shown in figure 4, lithium battery group 10 includes 3 lithium cells 101,102 and 103, the pin 1 and 2 of charge connector 205 is that the first anode connects pin, and pin 3 connects pin, pin with 4 for the first cathode 5 be the positive pin of charging, and pin 6 is charging negative pin.Charge protection device 206 by sampling connector respectively with the 1st The anode of lithium cells 101 and the cathode of the 3rd lithium cells 103 connection (sampling connector is to show).Pin 1 with The anode connection of 2nd lithium cells 102, pin 2 are connect with the 3rd the positive of lithium cells 103, pin 3 and the 1st The cathode of lithium cells connects, and pin 4 is connect with the cathode of the 2nd lithium cells 102, one end of pin 5 and charger The positive pin connection of charging of protection unit 206, the anode connection of the other end and external power supply 30, one end of pin 6 and charge protection Pin connection is born in the charging of device 206, and the other end is connected with the cathode of external power supply 30.
Further, the electric discharge connector includes:Second anode connection pin, the second cathode connection pin and electric discharge are negative Pole pin;The second anode connection pin, quantity is identical with the quantity of the lithium cells, one end and each lithium The anode of battery unit connects one to one, and the other end is connected with each other, and as the anode of lithium battery group when discharging;Institute The second cathode connection pin is stated, quantity is identical with the quantity of the lithium cells, one end and each lithium cells Cathode connect one to one, the other end be connected with each other;The electric discharge of the electric discharge negative pin and the discharge protector Negative pin connection, the cathode of lithium battery group when as electric discharge.Exemplary, shown in Fig. 5, lithium battery group 10 includes 3 lithium electricity The pin 1-3 of pool unit 101,102 and 103, electric discharge connector 207 is that the second anode connects pin, and pin 4-6 is the second cathode Pin is connected, pin 7 is electric discharge negative pin.One end of pin 1, pin 2 and pin 3 respectively with the 1st lithium cells 101 Anode, the 2nd lithium cells 102 anode and the 3rd lithium cells 103 anode connection, pin 1, pin 2 and draw The other end of foot 3 is connected with each other, and anode when discharge as lithium battery group 10 is connect with loading 40.Pin 4, pin 5 and draw One end of foot 6 respectively with the cathode of the 1st lithium cells 101, the cathode and the 3rd lithium battery of the 2nd lithium cells 102 The cathode of unit 103 connects, and the other end of pin 4, pin 5 and pin 6 is connected with each other.One end of pin 7 and discharge prevention dress Pin connection is born in the electric discharge for setting 208, and the cathode when other end of pin 7 discharges as lithium battery group 10 is connect with load 40.
Wherein, electric discharge connector connects pin by each lithium cells by its second anode connection pin and the second cathode Parallel connection, and load is connected on the positive and negative anodes of lithium battery group by charge positive pin and charging negative pin, to realize Lithium battery group is to load discharge.
Technical solution provided in this embodiment passes through charging respectively under the charged state and discharge condition of lithium battery group Connector connects lithium cells with electric discharge connector, obtains the phase of lithium battery group by sampling connector by battery protecting apparatus Electrical parameter is closed, the charge and discharge process of lithium battery group is protected, avoids the occurrence of to overcharge and cross and puts phenomenon.
Embodiment three
Fig. 6 is a kind of circuit diagram for lithium battery group charge and discharge device that embodiment three provides, technology provided in this embodiment Scheme is preferred embodiment on the basis of the above embodiments, and the technical program is suitable for the lithium of 3 lithium cells composition Battery pack.
As shown in fig. 6, lithium battery group charge and discharge device includes:Charge protection device, discharge protector, sampling connection Device, charge connector and electric discharge connector.
Wherein, under lithium battery group charged state, concatenated lithium cells are according to the cathode from lithium battery group to anode Sequentially, the first lithium cells, the second lithium cells and third lithium cells are followed successively by.The pin 1 of sampling connector is Cathode samples line, connects the cathode of the first lithium cells, the pin 2-4 of sampling connector is anode sampling line, and pin 2 connects The anode of the first lithium cells is connect, pin 3 connects the anode of the second lithium cells, and pin 3 connects third lithium cells Anode.
When lithium battery group is charged, one end of the pin 3 of charge connector connects the anode of the first lithium cells, One end of the pin 4 of charge connector connects the cathode of the second lithium cells, one end connection of the pin 5 of charge connector the The anode of two lithium cells, the cathode of one end connection third lithium cells of the pin 6 of charge connector, charge connector Pin 3 the other end and charge connector pin 4 the other end connect, the other end of the pin 5 of charge connector with fill The other end of the pin 6 of electric connector connects, to which lithium cells be connected by charge connector.
Charge protection device includes:Charge protection chip U1 and PMOS tube M1, the pin 13 of charge protection chip U1, pin 14 and pin 15 be its voltage detection terminal, and pass through the pin of resistance R1, resistance R2 and resistance R3 and sampling connector respectively 2, pin 3 and pin 4 connect.The pin 7 of charge protection chip U1 is its negative supply input terminal, and passes through resistance R4 and sampling The pin 1 of connector connects.The pin 16 of charge protection chip U1 is its positive supply input terminal, and draws with sampling connector Foot 4 connects.As shown in fig. 6, the positive supply input terminal of charge protection chip U1 by capacitance C1-C4 respectively with voltage detecting end Son and negative supply input terminal connection, charge protection chip U1 can by positive supply input terminal, negative supply input terminal and Voltage detection terminal obtains the positive and negative voltage across poles of single lithium cells.
The charging of charge protection device is born pin C- and is connected by the pin 1 of resistance R5 and sampling connector, charge protection The positive pin C+ of charging of device is connected by the pin 4 of PMOS tube M1 and sampling connector.The charging of charge protection device is just drawn The pin 7 and pin 8 of foot C+ and charge connector connect, and are connected to charging electricity by the pin of charge connector 7 and pin 8 The anode in source;Pin C- is born in the charging of charge protection device and the pin 1 and pin 2 of charge connector connect, and passes through charging The pin 1 and pin 2 of connector are connected to the cathode of charge power supply.Wherein, the pin 1 of charge connector and pin 2 all with fill Pin C- connections are born in the charging of electrical protective device, are and to increase electric current of the conducting wire when charging in order to reduce the resistance of conducting wire and hold Loading capability, the pin 7 of charge connector and the effect of pin 8 are identical with the effect of pin 2 with the pin 1 of charge connector. The grid and source electrode of PMOS tube M1 is connected by the pin 1 of resistance R6 and charge protection chip U1, and charge protection chip U1's draws Foot 1 is charge control terminal.Under lithium battery group charged state, when any lithium cells that charge protection device is got Positive and negative voltage across poles, which is more than or equal to, overcharges electro-detection protection pressure, then is turned off by the charge control terminal of charge protection chip U1 PMOS tube M1 stops charging to the lithium battery group, to reach the charge protection to lithium battery group, avoids overcharging phenomenon.
When lithium battery group is discharged, one end of the pin 1-3 for the connector that discharges respectively with the first lithium cells Cathode, the second lithium cells cathode connected with the cathode of third lithium cells, the pin 1-3's for the connector that discharges is another End is connected with each other;Discharge connector pin 7-9 one end respectively with the anode of the first lithium cells, the second lithium cells Anode and third lithium cells anode connection, the other end of the pin 7-9 for the connector that discharges is connected with each other, to by lithium Battery units in parallel, under lithium battery group discharge condition, the other end of the pin 7-9 for the connector that discharges and load connect, as Anode under lithium battery group discharge condition.
Discharge protector includes:Discharge prevention chip U2, NMOS tube M2 and NMOS tube M3, discharge prevention chip U2's draws Foot 5 is its positive supply input terminal, and is connected by the pin 2 of resistance R11 and sampling connector that discharge prevention chip U2's draws Foot 6 is its negative supply input terminal, and is connect with the pin of sampling connector 1, the pin 5 and pin 6 of discharge prevention chip U2 It is connected by capacitance C8, discharge prevention chip U2 can obtain the positive and negative anodes of lithium cells in parallel by its pin 5 and pin 6 Between voltage.
It is connected on the negative supply input terminal of discharge prevention chip U2 after NMOS tube M2 and NMOS tube M3 are parallel with one another and puts Between pin P- is born in the electric discharge of electrical protective device, the grid of NMOS tube M2 and the grid of NMOS tube M3 are with discharge prevention chip U2's Pin 1 connects, and the pin 1 of discharge prevention chip U2 is its control of discharge terminal.Discharge connector pin 4-6 one end with put Pin P- connections are born in the electric discharge of electrical protective device, and the other end of the pin 4-6 for the connector that discharges and load connect, and as lithium electricity Cathode under the group discharge condition of pond.Under lithium battery group discharge condition, when discharge protector obtain lithium battery group it is positive and negative Voltage across poles is less than or equal to overdischarge and detects voltage, then turns off NMOS tube M2 by the control of discharge terminal of control of discharge chip U2 With NMOS tube M3, stops the lithium battery group electric discharge, avoided putting phenomenon.
The said goods can perform the method that any embodiment of the present invention is provided, and have the corresponding function module of execution method And advantageous effect.
Note that above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that The present invention is not limited to specific embodiments described here, can carry out for a person skilled in the art it is various it is apparent variation, It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out to the present invention by above example It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also May include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.

Claims (4)

1. a kind of lithium battery group charge and discharge device, including:Charge connector and electric discharge connector, it is characterised in that:
Under lithium battery group charged state, at least two lithium cells are connected serially to by power supply by the charge connector and are carried out Charging;
Under lithium battery group discharge condition, at least two lithium cells are connected in parallel to by load by the electric discharge connector and are carried out Electric discharge;
Wherein, the charge connector and the electric discharge connector interfere in structure, when being inserted in one of, another It cannot then be connected at least two lithium cells;
The lithium battery group charge and discharge device further includes:Sampling connector and battery protecting apparatus;
The sampling connector includes:At least two anode sampling lines and a cathode sample line;
The anode connection of the first end and each lithium cells of each anode sampling line, the cathode sampling line First end is connected with the cathode of the last one lithium cells when series connection;
The battery protecting apparatus is used to obtain the electrical parameter of the lithium cells by the sampling connector;
The battery protecting apparatus, including:
Charge protection device, the second end that line is sampled with the second end of the anode sampling line and the cathode connect, are used for Under the lithium battery group charged state, the positive and negative voltage across poles of each lithium cells is obtained, and according to described positive and negative Voltage across poles carries out charge protection;
Discharge protector, the second end that line is sampled with the second end of the anode sampling line with the cathode connect, are used for Under the lithium battery group discharge condition, the positive and negative voltage across poles of the lithium battery group is obtained, and according to the positive and negative voltage across poles Carry out discharge prevention;
The discharge protector, including:
Discharge prevention chip and N-channel metal-oxide-semiconductor field effect t NMOS;
The positive supply input terminal of the discharge prevention chip is connect by the 5th resistance with the second end of the anode sampling line, And it is connect with the negative supply input terminal of the discharge prevention chip by capacitance;
The second end that the negative supply input terminal of the discharge prevention chip samples line with the cathode is connect;
The NMOS tube is connected on the electric discharge of the negative supply input terminal and the discharge protector of the discharge prevention chip Between negative pin, grid is connected with the control of discharge terminal of the discharge prevention chip, for discharging in the lithium battery group Under state, when the positive and negative voltage across poles for the lithium battery group that the discharge protector obtains is less than or equal to the second default electricity Pressure then turns off the NMOS tube by the control of discharge terminal of the control of discharge chip, stops the lithium battery group electric discharge.
2. lithium battery group charge and discharge device according to claim 1, which is characterized in that the charge protection device, including: Charge protection chip and P-channel metal-oxide-semiconductor field effect t PMOS;
The voltage detection terminal of the charge protection chip is connect by first resistor with the second end of the anode sampling line;
The charging of the negative supply input terminal and the charge protection device of the charge protection chip is born pin and is passed through respectively The second end that second resistance and 3rd resistor sample line with the cathode is connect;
The positive supply input terminal of the charge protection chip is connect with the second end of first anode sampling line;
The PMOS tube is connected on the positive pin of charging of the charge protection device and first anode samples the second of line Between end, grid is connected by the 4th resistance with the charge control terminal of the charge protection chip with source electrode, in institute It states under lithium battery group charged state, when the positive and negative interpolar electricity for any lithium cells that the charge protection device is got Pressure is more than or equal to the first predeterminated voltage, then turns off the PMOS tube by the charge control terminal of the charge protection chip, stop Only charge to the lithium battery group.
3. lithium battery group charge and discharge device according to claim 2, which is characterized in that the charge connector includes:The One anode connection pin, the first cathode connection pin, the positive pin of charging and charging negative pin;
The first anode connection pin, one fewer than the quantity of the lithium cells of quantity, one end and the when connecting The anode connection of the lithium cells other than one lithium cells;
First cathode connects pin, and quantity is identical with the quantity of the anode connection pin, when one end and series connection most The cathode of the lithium cells other than lithium cells described in the latter connects;
The other end of the first anode connection pin connects the other end connection of pin with adjacent first cathode before it, To which at least two lithium cells be connected;
The positive pin of the charging, one end are connected with the positive pin of the charging of the charge protection device, the other end and the electricity The anode connection in source;
The charging negative pin, one end and the charging of the charge protection device are born pin and are connected, the other end and the electricity The cathode in source connects.
4. lithium battery group charge and discharge device according to claim 1, which is characterized in that the electric discharge connector includes:The Two anode connection pins, the second cathode connection pin and electric discharge negative pin;
The second anode connection pin, quantity is identical with the quantity of the lithium cells, one end and each lithium electricity The anode of pool unit connects one to one, and the other end is connected with each other, and under the lithium battery group discharge condition, as described The anode of lithium battery group and load connection;
Second cathode connects pin, and quantity is identical with the quantity of the lithium cells, one end and each lithium electricity The cathode of pool unit connects one to one, and the other end is connected with each other;
One end of the electric discharge negative pin is born pin with the electric discharge of the discharge protector and is connected, and the other end is in lithium electricity Under the group discharge condition of pond, connected as the cathode of the lithium battery group and the load.
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