CN106300279A - Forced charge protection circuit after secondary cell overdischarge - Google Patents
Forced charge protection circuit after secondary cell overdischarge Download PDFInfo
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- CN106300279A CN106300279A CN201510238874.5A CN201510238874A CN106300279A CN 106300279 A CN106300279 A CN 106300279A CN 201510238874 A CN201510238874 A CN 201510238874A CN 106300279 A CN106300279 A CN 106300279A
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Abstract
Disclosed herein a kind of forced charge protection circuit after secondary cell overdischarge, this circuit comprises circuit turn-on switch, releasing unit, trigger element and comparing unit.The present invention is in the case of secondary cell overdischarge, it is provided that an interim electrical connection, keeps the loop not open circuit of secondary cell and charger；And when state resumed work by secondary cell, cancel interim electrical connection, allow secondary cell maintain normal operation.Secondary cell so can be made when facing over-discharge state, it is not necessary to unloaded maintenance by work and also can solve problem, reduce the cost of maintenance.
Description
Technical field
The present invention relates to a kind of forced charge protection circuit, particularly relate to a kind of for secondary cell overdischarge
After forced charge protection circuit.
Background technology
Secondary cell, the most so-called rechargeable battery, it is widely used in many products, such as takes down notes
This computer, tablet PC, mobile phone, even Large Electric car and robot.Although secondary cell
How to be made up of rechargeable battery core serial or parallel connection, but, according to the difference of power supply supply object, have not
Same output electric current and the specification of electricity.
Due to each battery form secondary cell time, there is different characteristics, cause secondary cell to exist
During use, no matter charge or discharge, all can there is unbalanced problem between battery.Abnormal running
Secondary cell temperature can be caused to raise, and the service life reducing battery even causes blast.Wherein, two are caused
The reason that the service life of primary cell reduces, mainly overcharge or the operation of overdischarge.Therefore, general two
Primary cell all can arrange battery management chip for solving above problem.
See Fig. 1, the figure shows the framework of a kind of existing secondary cell 1, wherein contain a battery
Managing chip 2.Storage and supply source that the electric power of secondary cell 1 is main are the several battery being connected in series
3.Battery management chip 2 is connected in the group of battery 3, can effectively learn the shape of each battery 3
State is with these battery 3 of dynamic equilibrium.Additionally, battery management chip 2 and charging control switch 4 and electric discharge are controlled
System switch 5 one charge-discharge protection circuit of composition.Wherein charging control switch 4 and discharge control switch 5 are each
It is made up of a field-effect transistor and a parasitic diode.This charge-discharge protection circuit further with one
Terminal unit 6 connects.Terminal unit 6 has a positive terminal 6a, a negative pole end 6b and an information passes
Defeated end 6c.Terminal unit 6 can be the form of a socket, this to see its object connected determine to be intended to into
Row charge or discharge.The state of battery 3 can be passed by battery management chip 2 through information transmission ends 6c
Deliver in the managing and control system outside secondary cell 1；Or received from managing and control system by information transmission ends 6c
Instruction realizes management battery 3.
When terminal unit 6 connect to as if during charger, electric current flows to battery 3 via positive terminal 6a,
After sequentially passing through discharge control switch 5 and charging control switch 4, flow back to charger finally by negative pole end 6b.
Now charging control switch 4 maintains, with discharge control switch 5, the state opened, and battery management chip 2 passes through
Resistance 7 knows sense of current, and then knows and be currently charged state.And work as the right of terminal unit 6 connection
As if during a load, electric current is flowed to load by battery 3 via positive terminal 6a；Load end also has electric current warp
Negative pole end 6b, charging control switch 4 flow back into battery 3 with discharge control switch 5, complete loop.This
Time charging control switch 4 be also opening with discharge control switch 5.Battery management chip 2 is also by electricity
The sense of current of resistance 7 is it is known that be currently discharge condition.
When secondary cell 1 is in charging, if encountering situation (the namely secondary cell 1 of overcharge
Voltage has exceeded specified maximum voltage value in charging) time, battery management chip 2 can be turned off charging control and hold
Closing 4, protection secondary cell 1 is no longer hurt because continuing charging；Similarly, when secondary cell 1 is in electric discharge
Time, if encounter overdischarge situation (namely the voltage of secondary cell 1 in electric discharge less than minimum appearance
Permitted magnitude of voltage) time, battery management chip 2 can turn off discharge control switch 5, protection secondary cell 1 no longer because of
Continue electric discharge and Rechargeability cannot be recovered.When carrying out additives for overcharge protection, due to the voltage of secondary cell 1
Can decline over time, after less than specified maximum voltage value, battery management chip 2 can open charging once again
Controlling switch 4, secondary cell 1 recovers normal operation.But, when carrying out over, due to secondary
The voltage of battery 1 can not return to normal operation voltage, unless forced to carry out recovery action outside battery,
Secondary cell 1 cannot recover normal operation.
For consumer, if use secondary cell generation over and normal operation cannot be recovered,
They are necessarily considered secondary cell damage, it is desirable to manufacturer returns goods；Even if manufacturer is ready to take available secondary
Battery is replaced, this shipment and delivery cost having a try, and also result in the loss of manufacturer.Therefore, how two
After primary cell generation over, effectively restarting secondary cell normal operation, relevant circuit design is urgently
Research and development.
Summary of the invention
In order to solve above-mentioned problem, the present invention provides a kind of forced charge after secondary cell overdischarge
Protection circuit.
Described forced charge protection circuit after secondary cell overdischarge comprises circuit turn-on switch, release
Unit, trigger element and comparing unit.Wherein, described circuit turn-on switch and filling of connecting in secondary cell
The two ends of electric control switch and discharge control switch are connected in parallel, and conduct during described circuit turn-on switch open
Described two ends；Releasing unit is applicable to after receiving release voltage turn on ground connection；Trigger element is connected to described
Circuit turn-on switch and described releasing unit, it is adaptable to after receiving triggering signal, conduct described circuit
Connection between conducting switch and described releasing unit；Comparing unit is electrically connected to described secondary cell, compares institute
State the voltage difference of anode of secondary battery and negative pole and minimum allowable voltage value；When described voltage difference more than described
During low allowable voltage value, it is provided that normal voltage gives described releasing unit；When described voltage difference is less than described minimum
During allowable voltage value, it is provided that release voltage gives described releasing unit.When described releasing unit conducting ground connection and institute
When stating the electrical connection that trigger element turns between described circuit turn-on switch and described releasing unit, described circuit is led
Logical switch open.
Wherein in an embodiment, described trigger element is connected to trigger switch, described triggering switch open
Time, described triggering signal is emitted to described trigger element.
Wherein in an embodiment, described trigger element is thyristor.
Wherein in an embodiment, the gate of described thyristor is connected with the described switch that triggers, and works as institute
When stating triggering switch open, described gate receives high-potential voltage.
Wherein in an embodiment, described forced charge protection circuit also comprises power supply, leads with described circuit
Open up pass to connect, it is adaptable to provide the electric power needed for described circuit turn-on switching operations.
Wherein in an embodiment, described comparing unit is comparator.
Wherein in an embodiment, the input of described comparator is connected to the circuit letter of described secondary cell
Number source.
Wherein in an embodiment, described circuit signal source is the battery management chip of described secondary cell
Discharge control switch pin or running voltage pin.
Wherein in an embodiment, described releasing unit comprises field-effect transistor and parasitic diode.
Wherein in an embodiment, described circuit turn-on switch is photo-coupled relay.
The invention has the beneficial effects as follows:
The forced charge protection circuit after secondary cell overdischarge of the present invention, in secondary cell overdischarge
In the case of, it is provided that an interim electrical connection, keep the loop not open circuit of secondary cell and charger；And
When state resumed work by secondary cell, cancel interim electrical connection, allow secondary cell maintain normal operation.This
Sample can make secondary cell when facing over-discharge state, it is not necessary to is unloaded maintenance by work and also can solve problem,
Reduce the cost of maintenance.
Accompanying drawing explanation
Fig. 1 is a kind of existing secondary cell framework；
Fig. 2 is the schematic diagram of forced charge protection circuit connected secondary cell one enforcement of the present invention；
Fig. 3 is the Organization Chart of forced charge protection circuit one embodiment of the present invention；
Fig. 4 is trigger element in the forced charge protection circuit of the present invention and the showing of releasing unit one embodiment
It is intended to；
Fig. 5 be the present invention forced charge protection circuit in the schematic diagram of comparing unit one embodiment；
Fig. 6 be the present invention forced charge protection circuit in the time-scale of members；
Wherein, 1-secondary cell, 2-battery management chip, 3-battery, 4-charging control switch, 5-discharges
Control switch, 6-terminal unit, 6a-positive terminal, 6b-negative pole end, 6c-information transmission ends, 7-resistance, 100-
Secondary cell, 100a～100d-node, 110-battery, 120-battery management chip, 121-running voltage is drawn
Foot, 122-earth terminal pin, 123-charging control switch pin, 124-discharge control switch pin, 125-electricity
Pond signal pin, 127-resistance, 130-charging control switch, 140-discharge control switch, 150-terminal unit,
150a-positive terminal, 150b-negative pole end, 150c-signal end, 200-forced charge protection circuit, 210-circuit is led
Opening up pass, 220-releasing unit, 230-trigger element, 240-comparing unit, 250-triggers switch, 260-electricity
Source, 261-power circuit.
Detailed description of the invention
In order to make technical scheme clearer, below in conjunction with accompanying drawing, to the present invention for secondary
Forced charge protection circuit after battery is described in further detail.Should be appreciated that described herein
Specific embodiment is only in order to explain that the present invention is not intended to limit the present invention.
The present invention will be described more specifically with reference to following embodiment.
Refering to Fig. 2 to Fig. 6, embodiments of the invention combine these and graphic illustrate.Figure 2 illustrates
A kind of forced charge protection circuit 200 of the present invention.This forced charge protection circuit 200 and a secondary cell
100 connect.Before forced charge protection circuit 200 is illustrated, first for forced charge protection circuit
200 applicable secondary cells 100 illustrate.
Commercially available secondary cell is different from application because of its element, is divided into very many kinds.
The secondary cell of present invention application, no matter its battery storing electric power be which kind of material with specification (preferably
Nickel-cadmium cell (Ni-Cd), Ni-MH battery (Ni-MH), lithium ion battery (Li-ion) or lithium macromolecule electricity
Pond (Li-polymer)), but must have the battery management chip that secondary cell is managed.Additionally, it is electric
Pond managing chip wants to carry out secondary cell overcharge or over, namely meets with at secondary cell
During the situation of overcharge and overdischarge, battery management chip can stop the running of secondary cell.Therefore, at Fig. 2
Description in, the structure of secondary cell 100 mainly contains several battery being one another in series and/or being connected in parallel
110, one, core meets the battery management chip 120 of above-mentioned requirements, charging control switch 130, control of discharge
Switch 140 and terminal unit 150.
When secondary cell 100 is in running, charging control switch 130 is all opened with discharge control switch 140
The state opened, in order to electric current passes through.When terminal unit 150 connect to as if charge power supply (not shown)
Time, electric current is flowed through battery 110 groups successively by positive terminal 150a, discharge control switch 140 controls with charging
Switch 130, is finally flowed back to charge power supply by negative pole end 150b, and the most each battery 110 is all charged；
When terminal unit 150 connect to as if load (not shown) time, electric current is flowed through successively by negative pole end 150b
Charging control switch 130, discharge control switch 140 and battery 110 groups, finally flowed by positive terminal 150a
Returning load, the most each battery 110 is discharged.Battery management chip 120 can be by flowing through resistance 127
The sense of current, it is judged that now secondary cell 100 be by electric discharge or charging.
Battery management chip 120 has several pin.Running voltage pin (VDD) 121 is connected to discharge and recharge
A node 100a on loop, owing to node 100a is near the positive terminal of battery 110 groups, therefore can obtain
Obtain the high potential energy of battery 110 group terminal.Relatively, earth terminal pin (VSS) 122 is received discharge and recharge and is returned
Another node 100b on road, because node 100b is near the negative pole end of battery 110 groups, can obtain electricity
The electronegative potential energy of pond core 110 group terminal.Difference between high potential energy and electronegative potential energy approximates secondary cell 100
Instantly running voltage.Charging control switch pin 123 and discharge control switch pin 124 are respectively intended to out
Open or charge closing controls switch 130 and discharge control switch 140.During secondary cell 100 normal operation, fill
Electric control switch pin 123 and discharge control switch pin 124 are all on.Battery signal pin 125
It is used for the state transfer of battery to the equipment (not shown) being connected with the signal end 150c of terminal unit 150
In, or accept to carry out the running of secondary cell 100 from the instruction of equipment.
Forced charge protection circuit 200 is when secondary cell 100 normal operation, only with secondary cell 100 phase
Lian Erwu effect；Only after secondary cell 200 runs into the situation of overdischarge, forced charge protection circuit 200
Just play a role.Forced charge protection circuit 200 is by circuit turn-on switch 210, releasing unit 220, triggering
Unit 230, comparing unit 240, triggering switch 250 form with power supply 260.Circuit turn-on switch 210 with
In secondary cell 100, the charging control switch 130 of series connection and the two ends of discharge control switch 140 are connected in parallel,
The node 100c being i.e. electrically connected in Fig. 2 and node 100d.When circuit turn-on switch 210 unlatching, node
Produce between 100c and node 100d (two ends) and conduct.Circuit turn-on switch 210 can be general conventional
Electronic type switch, preferably photo-coupled relay.Power supply 260 is connected with circuit turn-on switch 210, uses
In providing the electric power needed for circuit turn-on switch 210 running.Between power supply 260 and circuit turn-on switch 210
There is a power circuit 261 to complete being connected of electric power and circuit turn-on switch 210.Preferably, power circuit
261 have prevent battery electric power adverse current design to protect power supply 260.
Releasing unit 220 is used for after receiving release voltage turning on ground connection, and when receive be normal voltage time,
Releasing unit 220 blocks ground connection.It practice, normal voltage can differ from release voltage range of error
Any magnitude of voltage, releasing unit 220 is an electrical switch.As shown in Figure 4, releasing unit 220 is one
The individual switch being made up of field-effect transistor and parasitic diode, its gate electrically connects with comparing unit 240,
The open and close of releasing unit 220 are controlled by comparing unit 240.Trigger element 230 is connected to circuit and leads
Open up pass 210 and releasing unit 220, for after receiving triggering signal, conduct circuit turn-on switch
Connection between 210 and releasing unit 220.In the present embodiment, trigger element 230 is a thyristor.
For the sake of easy to control, trigger element 230 is connected further to trigger switch 250, triggers switch 250 and exists
It is to close during secondary cell 100 normal operation.When triggering switch 250 unlatching, above-mentioned triggering signal
Just trigger element 230 it is emitted to.Triggering switch 250 can be general key switch, by artificial manually control
System；Triggering switch 250 can also be an electronic switch, opens by setting a certain particular event,
Such as secondary cell 100 quits work 30 minutes because of overdischarge.The gate of thyristor is opened with triggering
Closing 250 connections, when triggering switch 250 unlatching, gate receives high-potential voltage, namely triggers signal.
When releasing unit 220 turns on ground connection, and trigger element 230 turning circuit turns on switch 210 and releasing unit
During electrical connection between 220, circuit turn-on switch 210 is switched on.
Comparing unit 240 is electrically connected to secondary cell 100, comparable secondary cell 100 positive pole and the electricity of negative pole
Pressure reduction, the namely running voltage of secondary cell 100, with the size of minimum allowable voltage value.Work as voltage difference
During more than minimum allowable voltage value, it is provided that normal voltage is to releasing unit 220；When voltage difference is allowed less than minimum
During magnitude of voltage, it is provided that release voltage is to releasing unit 220.In implementation, comparing unit 240 can be a ratio
Relatively device, as shown in Figure 5.Comparator except receive running voltage (note that secondary cell 100 work electricity
Pressure and the running voltage of forced charge protection circuit 200 may not be certain identical) with ground connection outside, still have two inputs
End and an outfan.Minimum allowable voltage value is used to assess the standard of secondary cell 100 overdischarge, if
Be secondary cell 100 both positive and negative polarity voltage difference less than minimum allowable voltage value time, secondary cell 100 can be recognized
Surely over-discharge state it is in.Minimum allowable voltage as a reference voltage, by one of them input (-)
Input, and another input of comparator (+) be connected in the circuit signal source of secondary cell 100, take
Secondary cell 100 running voltage instantly, or the voltage difference of positive pole and negative pole.Circuit signal source is two
The discharge control switch pin 124 of the battery management chip 120 of primary cell 100, it is also possible to draw for running voltage
Foot 121, in the design of this battery management chip 120 to be seen, which pin can stop at secondary cell 100
In the case of running, using the teaching of the invention it is possible to provide above-mentioned running voltage or voltage difference.In the present embodiment it should be noted that
Because the selection of input, the current potential of normal voltage is higher than the current potential of release voltage；If reference voltage and work
The input exchange of voltage, the current potential of normal voltage will be lower than the current potential of release voltage.
As shown in Figure 6, the operating instruction of forced charge protection circuit 200 is as follows.In figure 6, secondary electricity
The operating voltage state H (High) and L (Low) in pond 100 represents that secondary cell 100 is in normally respectively
In the case of work or overdischarge, output voltage H Yu L of comparing unit 240 represents comparing unit 240 respectively
The normal voltage of output and release voltage, voltage H Yu L of power supply 260 represents that power supply 260 supplies electricity respectively
Power and stopping supply power state.
When forced charge protection circuit 200 is connected in normal operation with secondary cell 100, compare
The output voltage of unit 240 is normal voltage, and releasing unit 220 is closed, and triggers switch 250 closedown, electricity
Road conducting switch 210 closedown.It should be noted that power supply 260 is at forced charge protection circuit 200 and secondary
It is all that such forced charge protection circuit 200 just can have in supply power state under battery 100 connection status
Effect running.
When the time comes t1, in the case of secondary cell 100 is in overdischarge, discharge control switch 140
Closing, loop when secondary cell 100 discharges becomes open circuit at discharge control switch 140.By forced charge
The circuit (between node 100c to node 100d) that protection circuit 200 connects defines bypass and connects, this
Time, the voltage difference that circuit signal source is provided is lower than minimum allowable voltage value, and comparing unit 240 exports electricity
Pressure changes electronegative potential into, i.e. provides release voltage to turn on ground connection to releasing unit 220, releasing unit 220.But,
Because triggering switch 250 closedown, trigger element 230 does not receives triggering signal, circuit turn-on switch 210 with
Being not connected with between releasing unit 220, circuit turn-on switch 210 is in closed mode.When the time comes t2,
Trigger switch 250 unlatching, between circuit turn-on switch 210 and releasing unit 220, become electric connection state.This
Time, circuit turn-on switch 210 unlatching, short-circuit between node 100c to node 100d, charger just can be by
Terminal unit 150 is to being charged secondary cell 100 forced charge.
And when the voltage difference of secondary cell 100 both positive and negative polarity rises through after a period of time in charging, bypass is even
Connect and just should cancel, battery management chip 120 is given back in the running of secondary cell 100 and processes.When t3,
The voltage difference that circuit signal source provides is higher than minimum allowable voltage value, and comparing unit 240 recovers to provide normal
Voltage is not turned on ground connection to releasing unit 220, releasing unit 220.Its result is circuit turn-on switch 210 pass
Close, cannot connect by bypass between node 100c to node 100d and maintain electrical connection.If secondary cell 100
Being continuously charger charging, battery management chip 120 will be because of secondary cell 100 at the electricity that normally works
Pressure, opens discharge control switch 140, allows the voltage difference of the positive and negative interpolar of secondary cell 100 continue to rise.Trigger
Switch 250 is not eager to cut out in the t3 moment, can wait until a little later that (t4) turns off.Because releasing unit
220 are not turned on ground connection, the time interval of t3 to t4, and the on off state of triggering switch 250 does not affect circuit leads
Open up and close 210 states remained off.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed,
But therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for this area
Those of ordinary skill for, without departing from the inventive concept of the premise, it is also possible to make some deformation and
Improving, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended
Claim is as the criterion.
Claims (10)
1. the forced charge protection circuit after secondary cell overdischarge, it is characterised in that comprise:
Circuit turn-on switchs, with the charging control switch connected in secondary cell and the two ends of discharge control switch
It is connected in parallel, during described circuit turn-on switch open, conducts described two ends；
Releasing unit, it is adaptable to turn on ground connection after receiving release voltage；
Trigger element, is connected to described circuit turn-on switch and described releasing unit, it is adaptable to tactile receiving
After sender number, conduct the connection between described circuit turn-on switch and described releasing unit；And
Comparing unit, is electrically connected to described secondary cell, compares the positive pole of described secondary cell and the electricity of negative pole
Pressure reduction and minimum allowable voltage value；When described voltage difference is more than described minimum allowable voltage value, it is provided that normal
Voltage gives described releasing unit；When described voltage difference is less than described minimum allowable voltage value, it is provided that release electricity
Pressure is to described releasing unit；
Wherein, when described releasing unit conducting ground connection and described trigger element turn on described circuit turn-on switch with
During electrical connection between described releasing unit, described circuit turn-on switch open.
Forced charge protection circuit the most according to claim 1, it is characterised in that described trigger element
Being connected to trigger switch, during described triggering switch open, described triggering signal is emitted to described trigger element.
Forced charge protection circuit the most according to claim 2, it is characterised in that described trigger element
For thyristor.
Forced charge protection circuit the most according to claim 3, it is characterised in that described silicon control rectification
The gate of device is connected with the described switch that triggers, and when described triggering switch open, described gate receives high potential
Voltage.
Forced charge protection circuit the most according to claim 1, it is characterised in that also comprise power supply,
It is connected with described circuit turn-on switch, it is adaptable to the electric power needed for described circuit turn-on switching operations is provided.
Forced charge protection circuit the most according to claim 1, it is characterised in that described comparing unit is
Comparator.
Forced charge protection circuit the most according to claim 6, it is characterised in that its of described comparator
In input be connected to the circuit signal source of described secondary cell.
Forced charge protection circuit the most according to claim 7, it is characterised in that described circuit signal
Source is discharge control switch pin or the running voltage pin of the battery management chip of described secondary cell.
Forced charge protection circuit the most according to claim 1, it is characterised in that described releasing unit bag
Containing field-effect transistor and parasitic diode.
Forced charge protection circuit the most according to claim 1, it is characterised in that described circuit turn-on
Switch is photo-coupled relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510238874.5A CN106300279B (en) | 2015-05-12 | 2015-05-12 | Circuit is protected for the forced charge after secondary cell overdischarge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510238874.5A CN106300279B (en) | 2015-05-12 | 2015-05-12 | Circuit is protected for the forced charge after secondary cell overdischarge |
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| CN106300279A true CN106300279A (en) | 2017-01-04 |
| CN106300279B CN106300279B (en) | 2018-09-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110932357A (en) * | 2019-12-16 | 2020-03-27 | 珠海格力电器股份有限公司 | Energy storage device |
| CN115425702A (en) * | 2022-04-28 | 2022-12-02 | 上海赛南能源有限公司 | Energy storage low-voltage lithium battery module BMS power loop topological structure and control method thereof |
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| CN115425702B (en) * | 2022-04-28 | 2024-06-25 | 上海赛南能源有限公司 | Energy storage low-voltage lithium battery module BMS power loop topological structure and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106300279B (en) | 2018-09-18 |
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