CN109193863A - Battery voltage balance control method and circuit - Google Patents
Battery voltage balance control method and circuit Download PDFInfo
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- CN109193863A CN109193863A CN201811247533.4A CN201811247533A CN109193863A CN 109193863 A CN109193863 A CN 109193863A CN 201811247533 A CN201811247533 A CN 201811247533A CN 109193863 A CN109193863 A CN 109193863A
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- equalization
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
This application involves a kind of battery voltage balance control method and circuits, obtain the end voltage of each battery cell in battery pack；When determining that battery pack needs to carry out electric voltage equalization according to end voltage, the battery cell for needing to carry out electric voltage equalization and balanced type are determined；When balanced type is charge balancing, charge balancing is carried out to the battery cell for needing to carry out electric voltage equalization by isolated power supply, isolated power supply is by battery-powered.After determining that battery pack needs to carry out electric voltage equalization, determine the battery cell for needing to carry out electric voltage equalization, electric voltage equalization processing is carried out to it to convenient, the case where avoiding the occurrence of charge and discharge, and, charge balancing is carried out by isolated power supply, the isolated power supply is by battery-powered, battery voltage can be depressured and be stablized in a fixed value, when carrying out charge balancing to battery cell, biggish voltage difference can be formed, so that the euqalizing current in voltage balance control circuit is larger, and then improves electric voltage equalization speed and efficiency.
Description
Technical field
This application involves technical field of battery management, more particularly to a kind of battery voltage balance control method and electricity
Road.
Background technique
With the development of science and technology, electric car using more and more extensive.Electric car refers to is with on-vehicle battery
The vehicle of power, it is even higher that the power battery voltage class of pure electric automobile commonly reaches three or four hectovolts, it is therefore desirable to will be more
A battery cell forms battery pack in series and parallel to be powered for electric car.However, different battery cells there are performances not
Consistent problem, the inconsistent service performance that not only will affect battery pack of battery performance, also resulted in charge and discharge (overcharge or
Over-discharge) the case where, so that battery capacity and service life decline.
Traditional technology generallys use flying capacitance equalizing circuit and carries out battery pack progress voltage balance control processing, for flying
It crosses for capacitor equalizing circuit, electric voltage equalization speed and equalization efficiency depend on the euqalizing current in equalizing circuit, balanced electricity
Flow smaller, then balancing speed is slower, and equalization efficiency is lower.In practical applications, the voltage of balanced capacitor is often electric with high voltage
The voltage in pond is closer to, and voltage difference is smaller, smaller so as to cause the euqalizing current in flying capacitance equalizing circuit, and then is caused
Electric voltage equalization speed is slower, and equalization efficiency is low.
Summary of the invention
Based on this, it is necessary to which the problem of being directed to traditional technology, providing a kind of can improve electric voltage equalization speed and effect
The battery voltage balance control method and circuit of rate.
A kind of battery voltage balance control method, comprising:
Obtain the end voltage of each battery cell in battery pack；
When determining that the battery pack needs to carry out electric voltage equalization according to the end voltage of each battery cell, determines and need
Carry out the battery cell and equilibrium type of electric voltage equalization；
Balanced type be charge balancing when, by isolated power supply to the battery cell for needing to carry out electric voltage equalization into
Row charge balancing, the isolated power supply is by described battery-powered.
In one of the embodiments, when the variance of the end voltage of each battery cell is greater than default variance threshold values,
Determine that the battery pack needs to carry out electric voltage equalization.
The determination needs to carry out the battery cell and equilibrium type of electric voltage equalization, packet in one of the embodiments,
It includes:
When balanced type is charge balancing, determine that the corresponding battery cell of least significant end voltage is to need to carry out electric voltage equalization
Battery cell；
When balanced type is equalization discharge, determine that the corresponding battery cell of most significant end voltage is to need to carry out electric voltage equalization
Battery cell.
In one of the embodiments, further include: by dissipative cell to the corresponding battery cell of the most significant end voltage
Carry out equalization discharge；
Balanced type be equalization discharge when, by dissipative cell to the battery cell for needing to carry out electric voltage equalization into
Row equalization discharge.
A kind of battery voltage balancing control circuit, comprising:
Controller, for obtaining the end voltage of each battery cell in the battery pack；When according to each battery cell
When end voltage determines that the battery pack needs to carry out electric voltage equalization, battery cell and the equilibrium for needing to carry out electric voltage equalization are determined
Type
Voltage balance circuit is connect with the controller and the battery pack, is used for when balanced type is charge balancing,
Charge balancing is carried out to the battery cell for needing to carry out electric voltage equalization by isolated power supply, the isolated power supply is by the electricity
The power supply of pond group.
The voltage balance circuit is also used to pass through when balanced type is equalization discharge in one of the embodiments,
Dissipative cell carries out equalization discharge to the battery cell for needing to carry out electric voltage equalization.
In one of the embodiments, further include: voltage collection circuit is connect with the battery pack and the controller,
For acquiring the end voltage of each battery cell in the battery pack and being sent to the controller.
In one of the embodiments, further include: switching circuit, the voltage balance circuit by the switching circuit with
The battery pack connection；
The switching circuit includes switch arrays and bus switches, and described switch arrays one end is connect with the battery pack,
The switch arrays other end is connect with the bus switches, the energy consumption member in the bus switches and the voltage balance circuit
Part and isolated power supply connection.
The bus switches include first switch bus and second switch bus in one of the embodiments,.
The input terminal of the isolated power supply is respectively with the total positive of the battery pack and always negative in one of the embodiments,
Pole connection, the output end of the isolated power supply are connect with the first switch bus and second switch bus respectively.
Above-mentioned battery voltage balance control method and circuit obtain the end voltage of each battery cell in battery pack；Work as root
When determining that battery pack needs to carry out electric voltage equalization according to the end voltage of each battery cell, the battery list for needing to carry out electric voltage equalization is determined
Body and balanced type；When balanced type is charge balancing, by isolated power supply to the battery list for needing to carry out electric voltage equalization
Body carries out charge balancing, and isolated power supply is by battery-powered.After determining that battery pack needs to carry out electric voltage equalization, determine need into
The battery cell of row electric voltage equalization, thus convenient the case where is carried out by electric voltage equalization processing, avoided the occurrence of charge and discharge for it, also,
Charge balancing is carried out by isolated power supply, by battery-powered, which can drop battery voltage the isolated power supply
Pressure is stablized in a fixed value, when carrying out charge balancing to battery cell, biggish voltage difference can be formed, so that voltage is equal
Euqalizing current in the control circuit that weighs is larger, and then improves electric voltage equalization speed and efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of battery voltage balancing control circuit in one embodiment；
Fig. 2 is the flow diagram of battery voltage balance control method in one embodiment；
Fig. 3 is the circuit structure diagram of battery voltage balancing control circuit in one embodiment；
Fig. 4 is the work flow diagram of circuit shown in Fig. 3；
Fig. 5 is the instantiation figure of charge balancing processing in one embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
In one embodiment, as shown in Figure 1, providing a kind of battery voltage balancing control circuit, Balance route electricity
Road is connect with battery pack 100, which includes controller 200 and voltage balance circuit 300.
Controller 200 is used to obtain the end voltage of each battery cell in battery pack 100；When the end electricity according to each battery cell
When determining battery pack 100 being pressed to need to carry out electric voltage equalization, the battery cell for needing to carry out electric voltage equalization and balanced type are determined.
Specifically, after controller 200 obtains the end voltage data of a battery cell in battery pack 100, according to all electricity
The end voltage data of pond monomer determines the need for carrying out electric voltage equalization processing.In the end voltage data according to all battery cells
Determine when not needing to carry out electric voltage equalization processing, illustrate between the end voltage data of each battery cell in battery pack 100 gap compared with
Small, the performance of each battery cell is more consistent.According to the end voltage data of all battery cells determine need to carry out voltage it is equal
When weighing apparatus processing, illustrate that gap is larger between the end voltage data of each battery cell in battery pack 100, the performance of each battery cell is not
Unanimously, at this time it needs to be determined that needing to carry out the battery cell and equilibrium type of electric voltage equalization.
Balanced type includes charge balancing and equalization discharge, wherein charge balancing refers to when battery pack 100 is in electric discharge shape
When state or static condition, when one of battery cell end voltage be less than other battery cells end voltage and meet into
When the Rule of judgment of row electric voltage equalization processing, charge balancing, the i.e. end by increasing the battery cell are carried out to the battery cell
Voltage, so that the end voltage and the end voltage of other battery cells of the battery cell are consistent.Equalization discharge, which refers to, works as battery
When group 100 is in charged state, when the end voltage of one of battery cell is greater than the end voltage of other battery cells and meets
When carrying out the Rule of judgment of electric voltage equalization processing, equalization discharge is carried out to the battery cell, i.e., by reducing the battery cell
Voltage is held, so that the end voltage and the end voltage of other battery cells of the battery cell are consistent.When controller 200 determines
When the type that weighs is charge balancing, determine that the corresponding battery cell of least significant end voltage is the battery cell for needing to carry out electric voltage equalization；
When controller 200 determines that balanced type is equalization discharge, the corresponding battery cell of most significant end voltage is determined to need to carry out electricity
Press balanced battery cell.
Voltage balance circuit 300 is connect with controller 200 and battery pack 100, is used for when balanced type is charge balancing,
Charge balancing is carried out to the battery cell for needing to carry out electric voltage equalization by isolated power supply, isolated power supply is powered by battery pack 100.
Specifically, voltage balance circuit 300 includes the circuit element that electric voltage equalization processing is carried out to battery pack 100, this reality
Applying the circuit element in example includes isolated power supply, which connect with battery pack 100, and is powered by battery pack 100, should be every
It is used for from power supply when controller 200 determines that the balanced type of battery pack 100 is charge balancing, to needing to carry out electric voltage equalization
Battery cell carries out charge balancing, and isolated power supply specifically can be two-way isolation type DC-DC converter.Since the isolated power supply is
It is directly powered, therefore 100 voltage step-down of battery pack can stablized in a fixed value, to battery cell by battery pack 100
When carrying out charge balancing, biggish voltage difference can be formed, so that the euqalizing current in voltage balance control circuit is larger, in turn
Improve electric voltage equalization speed and efficiency.
It is connect with battery pack 100 always it should be noted that balancing control circuit can be, i.e., controller 200 is real-time, holds
The end voltage of each battery cell in battery pack 100 is obtained continuously, and is judged whether to meet according to end voltage and be carried out at electric voltage equalization
The condition of reason, if not satisfied, then reacquiring end voltage.If satisfied, then carrying out electric voltage equalization processing.Balancing control circuit can also
To be just to connect when needed with battery pack 100, i.e., the end voltage of each battery cell in battery pack 100 is just obtained when needed,
And judged whether to meet the condition for carrying out electric voltage equalization processing according to end voltage.
Further, balancing control circuit, which carries out electric voltage equalization number of processing to battery pack 100, can be once, that is, work as
When controller 200 determines that battery pack 100 needs to carry out electric voltage equalization according to the end voltage of each battery cell, voltage balance circuit
300 pairs of battery packs 100 carry out a charge balancing or equalization discharge.Balancing control circuit carries out electric voltage equalization to battery pack 100
Number of processing is also possible to repeatedly, i.e., when controller 200 according to the end voltage of each battery cell determine battery pack 100 need into
Row electric voltage equalization, after voltage balance circuit 300 carries out a charge balancing or equalization discharge to battery pack 100, controller 200
The new end voltage for reacquiring each battery cell, when controller 200 according to new end voltage determine battery pack 100 there is still a need for into
When row electric voltage equalization, voltage balance circuit 300 carries out charge balancing or equalization discharge to battery pack 100 again, repeats above-mentioned step
Suddenly, until controller 200 determines that battery pack 100 does not need to carry out electric voltage equalization according to new end voltage.It is appreciated that working as voltage
Equalizing circuit 300 carry out primary voltage it is balanced after, if controller 200 according to new end voltage determine battery pack 100 do not need into
When row electric voltage equalization, at this time it is also assumed that being to belong to the case where carrying out the processing of multiple electric voltage equalization, only according to reality
Situation has only carried out primary voltage equilibrium treatment.
The present embodiment proposes a kind of battery voltage balancing control circuit, including controller 200 and voltage balance circuit
300, controller 200 determines the battery list for needing to carry out electric voltage equalization after determining that battery pack 100 needs to carry out electric voltage equalization
Body, thus convenient the case where is carried out by electric voltage equalization processing, avoided the occurrence of charge and discharge for it, also, voltage balance circuit 300 passes through
Isolated power supply carries out charge balancing, which is powered by battery pack 100, which can be by 100 voltage of battery pack
Decompression is stablized in a fixed value, when carrying out charge balancing to battery cell, biggish voltage difference can be formed, so that voltage
Euqalizing current in balancing control circuit is larger, and then improves electric voltage equalization speed and efficiency.
In one embodiment, the circuit element of electric voltage equalization processing is carried out in voltage balance circuit 300 to battery pack 100
It further include dissipative cell, which is used for when controller 200 determines that the balanced type of battery pack 100 is equalization discharge,
Equalization discharge is carried out to the battery cell for needing to carry out electric voltage equalization.
Specifically, dissipative cell refers to the pure resistance element in circuit, it can it is equivalent to the electronic component of a resistance value,
Such as electric furnace, bulb, variable speed energy saving frequency converter, MOSFET pipe, coil and resistor etc. do not contain the element of inductance and capacitor.
Dissipative cell realizes the consumption of energy by converting electrical energy into thermal energy.For the ease of illustrating, the application is with energy consumption resistor
As dissipative cell, energy consumption resistor specifically can be cement resistor, and cement resistor is one kind of wire-wound resistor, and it is larger to belong to power
Resistance, can allow for passing through for larger current, therefore can be adapted for the big occasion of electric current.
In the present embodiment, when controller 200 determines that the balanced type of battery pack 100 is equalization discharge, illustrate electric at this time
Pond group 100 is in charged state, and the end voltage of one of battery cell is greater than the end voltage of other battery cells, and meet into
The Rule of judgment of row electric voltage equalization processing, voltage balance circuit 300 discharges to the battery cell by dissipative cell at this time
Equilibrium treatment discharges to the battery cell by dissipative cell, so that the end voltage of the battery cell is reduced, so that should
The end voltage and the end voltage of other battery cells of battery cell are consistent.
In the present embodiment, after controller 200 determines that battery pack 100 needs to carry out electric voltage equalization, pass through dissipative cell pair
The battery cell for needing to carry out electric voltage equalization carries out equalization discharge processing, the case where overcharge can occurs to avoid battery cell,
To play the role of protecting battery.
In one embodiment, with reference to Fig. 1, which further includes voltage collection circuit 400, voltage acquisition electricity
Road 400 is connect with battery pack 100 and controller 200, for acquiring the end voltage of each battery cell in battery pack 100 and being sent to
Controller 200.
It is appreciated that voltage collection circuit 400 is not required in that in the balancing control circuit of the application, controller
200 when the end voltage data of battery cell, can be and be obtained by voltage collection circuit 400 in obtaining battery pack 100,
It can be and obtain by other means, as long as controller 200 can accurately obtain the end voltage of a battery cell in battery pack 100
Data.
The present embodiment is by being arranged voltage collection circuit 400, the end electricity of each battery cell in available battery pack 100
Pressure, controller 200 judge whether battery pack 100 needs equilibrium according to the end voltage data of acquisition, thereby may be ensured that battery pack
The case where performance of each battery cell is consistent in 100, prevents charge and discharge.
In one embodiment, as shown in Fig. 2, providing a kind of battery voltage balance control method, this method include with
Lower step:
Step S100 obtains the end voltage of each battery cell in battery pack.When carrying out battery voltage Balance route, control
Device processed obtains the end voltage of each battery cell in battery pack first, judges whether to need to carry out electric voltage equalization control according to end voltage
System.
Step S200, when determining that battery pack needs to carry out electric voltage equalization according to the end voltage of each battery cell, determining is needed
Carry out the battery cell and equilibrium type of electric voltage equalization.Controller determines need according to the end voltage data of all battery cells
When carrying out electric voltage equalization processing, illustrate that gap is larger between the end voltage data of each battery cell in battery pack, each battery list
The performance of body is inconsistent, at this time it needs to be determined that needing to carry out the battery cell and equilibrium type of electric voltage equalization.Balanced type packet
Charge balancing and equalization discharge are included, when controller determines that balanced type is charge balancing, determines the corresponding electricity of least significant end voltage
Pond monomer is the battery cell for needing to carry out electric voltage equalization；When controller determines that balanced type is equalization discharge, highest is determined
Holding the corresponding battery cell of voltage is the battery cell for needing to carry out electric voltage equalization.
Step S300, when balanced type is charge balancing, by isolated power supply to the battery for needing to carry out electric voltage equalization
Monomer carries out charge balancing, and isolated power supply is by battery-powered.
When controller determines that the balanced type of battery pack is charge balancing, the battery cell for carrying out electric voltage equalization is needed to be
The corresponding battery cell of least significant end voltage carries out charge balancing to the battery cell by isolated power supply at this time.Due to the isolation
Power supply be directly by battery-powered, therefore can by battery voltage be depressured stablize in a fixed value, to battery cell
When carrying out charge balancing, biggish voltage difference can be formed, so that the euqalizing current in voltage balance control circuit is larger, in turn
Improve electric voltage equalization speed and efficiency.
The present embodiment proposes a kind of battery voltage balance control method, is determining that battery pack needs to carry out electric voltage equalization
Afterwards, it determines the battery cell for needing to carry out electric voltage equalization, so that convenient carry out electric voltage equalization processing to it, avoided the occurrence of charge and discharge
The case where, also, charge balancing is carried out by isolated power supply, by battery-powered, which can incite somebody to action the isolated power supply
Battery voltage decompression is stablized in a fixed value, when carrying out charge balancing to battery cell, can form biggish voltage
Difference so that the euqalizing current in voltage balance control circuit is larger, and then improves electric voltage equalization speed and efficiency.
In one embodiment, in step S200, when the variance of the end voltage of each battery cell is greater than default variance threshold values
When, determine that battery pack needs to carry out electric voltage equalization.
Specifically, controller calculates the variance of all end voltages in obtaining battery pack after the end voltage of each battery cell,
The variance of end voltage can reflect the dispersion degree of the end voltage of each battery cell, and variance is higher, indicates discrete bigger, each battery
Monomer performance is more inconsistent.When the variance of the end voltage of each battery cell is greater than default variance threshold values, controller determines battery
Group needs to carry out electric voltage equalization.
The present embodiment is by calculating the variance of the end voltage of each battery cell, so as to relatively accurately electrolytic cell list
Whether the end voltage of body is consistent, so as to accurately judge whether to need to carry out electric voltage equalization processing, prevented
The case where charge and discharge.
In one embodiment, this method further include: by dissipative cell to the corresponding battery cell of most significant end voltage into
Row equalization discharge；When balanced type is equalization discharge, by dissipative cell to need to carry out the battery cell of electric voltage equalization into
Row equalization discharge.
When controller determines that the balanced type of battery pack is equalization discharge, illustrate that battery pack is in charged state at this time,
The end voltage of one of battery cell is greater than the end voltage of other battery cells, and meets the judgement for carrying out electric voltage equalization processing
Condition carries out equalization discharge processing to the battery cell by dissipative cell at this time, i.e., by dissipative cell to the battery cell
It discharges, so that the end voltage of the battery cell is reduced, so that the end of the end voltage and other battery cells of the battery cell
Voltage is consistent.
In the present embodiment, after determining that battery pack needs to carry out electric voltage equalization, by dissipative cell to needing to carry out voltage
Balanced battery cell carries out equalization discharge processing, the case where overcharge can occurs to avoid battery cell, to play protection
The effect of battery.
In one embodiment, as shown in figure 3, providing a kind of physical circuit of battery voltage balancing control circuit, packet
Include battery pack 100, controller 200, voltage balance circuit 300, voltage collection circuit 400 and switching circuit 500, battery pack 100
One end is connected to charger, and for charger for charging to battery pack 100,100 other end of battery pack is connected to switching circuit
500 one end, the other end of switching circuit 500 are connected to voltage balance circuit 300, and switching circuit 500 is for controlling battery pack
100 with the break-make situation of the line of voltage balance circuit 300.Voltage collection circuit 400 is connect with battery pack 100, for acquiring
The end voltage of each battery cell, voltage collection circuit 400 are also connect with controller 200 in battery pack 100, by collected end electricity
Pressure data are sent to controller 200.Controller 200 is connect with switching circuit 500 and voltage balance circuit 300, when controller 200
When judging that battery pack 100 needs to carry out electric voltage equalization according to end voltage data, pass through control switch circuit 500 and electric voltage equalization electricity
Road 300 is to realize that the electric voltage equalization to battery cell is handled.
Specifically, battery pack 100 includes multiple battery cell B1, B2 ... Bn, charger be connected to battery pack 100 it is total just
Pole B+ and total cathode B-.
Switching circuit 500 includes switch arrays 510 and bus switches 520, wherein switch arrays 510 include multiple switch
K1, K2 ... K2n, the quantity of the switch in switch arrays 510 are twice of battery cell quantity, the anode of each battery cell and
Cathode is respectively connected with a switch, for example, the anode of one end connecting single batteries B1 of switch K1, one end of switch K2 connects electricity
The cathode of pond monomer B1.It switchs the one end not connecting with battery cell and is connected to bus switches, bus switches include first switch
Bus and second switch bus, two switches for connecting the same battery cell are respectively connected to first switch bus and second and open
Bus is closed, for example, the other end of switch K1 is connected to second switch bus, it is total that the other end of switch K2 is connected to first switch
Line.
Voltage balance circuit 300 includes energy consumption resistor 310 and isolated power supply 320, and the both ends of energy consumption resistor 310 are separately connected
To first switch bus and second switch bus, the input terminal of isolated power supply is respectively with total anode B+ of battery pack 100 and always negative
Pole B- connection, the output end of isolated power supply are connect with first switch bus and second switch bus respectively.Voltage balance circuit 300
It further include the first control switch 330 and the second control switch 340, the first control switch is online for controlling 310 institute of energy consumption resistor
The break-make situation on road, the second control switch are used to control the break-make situation of 320 place route of isolated power supply.
As shown in figure 4, for the specific workflow figure of circuit in Fig. 3, comprising the following steps:
(1) voltage collection circuit acquires the end voltage of each battery cell in battery pack, and is sent to controller.
(2) controller calculates the variance δ of end voltage2, and find out highest monomer voltage Vmax and minimum monomer voltage Vmin
And corresponding battery cell Bi and Bj；
(3) controller judges δ2Whether default variance threshold values δ is greater than0 2If δ2≤δ0 2, then it represents that consistency of battery pack compared with
It is good, it does not need to carry out equilibrium, with return step (1) or can terminate at this time；If δ2>δ0 2, then it represents that consistency of battery pack is poor,
It needs to carry out equilibrium, perform the next step.
(4) controller obtains the current state of battery pack, and determines balanced type according to current state and need to carry out electricity
Press balanced battery cell.
Specifically, current state includes charged state, discharge condition and static condition, when battery pack is charged state,
Balanced type is equalization discharge, i.e., the end voltage of a battery cell is electric greater than the end of other battery cells in battery pack at this time
Pressure holds the higher battery cell of voltage to overcharge in order to prevent since each battery cell is all in charged state, needs pair
It carries out equalization discharge processing, determines that the battery cell for needing to carry out electric voltage equalization is that highest monomer voltage Vmax is corresponding at this time
Battery cell Bi.
When battery pack is discharge condition or static condition, balanced type is charge balancing, i.e., at this time one in battery pack
The end voltage of battery cell is less than the end voltage of other battery cells, holds the lower battery cell of voltage excessively to put in order to prevent
Electricity needs to carry out charge balancing processing to it, determines that the battery cell for needing to carry out electric voltage equalization is minimum monomer voltage at this time
The corresponding battery cell Bj of Vmin.
(5) in controller control switch array respectively switch, the first control switch and the second control switch break-make situation, connect
The connection line of the logical battery cell for needing to carry out electric voltage equalization and energy consumption resistor or isolated power supply.
Specifically, when balanced type is equalization discharge, the battery cell for needing to carry out electric voltage equalization is highest monomer electricity
The corresponding battery cell Bi of Vmax is pressed, closure is connected to switch K2i-1, the K2i and the first control switch at the both ends Bi at this time, opens
Other switches and the second control switch in array is closed to be in an off state, battery cell Bi is connected to the route of energy consumption resistor,
Energy consumption resistor carries out equalization discharge to battery cell Bi, so that the end voltage of the end voltage and other battery cells of battery cell Bi
It is consistent.
When balanced type is charge balancing, the battery cell for needing to carry out electric voltage equalization is Vmin pairs of minimum monomer voltage
The battery cell Bj answered, closure is connected to switch K2j-1, the K2j and the second control switch at the both ends Bj at this time, in switch arrays
Other switches and the first control switch are in an off state, and battery cell Bj is connected to the route of isolated power supply, isolated power supply
Charge balancing is carried out to battery cell Bj, so that the end voltage of battery cell Bj and the end voltage of other battery cells keep one
It causes.
As shown in figure 5, the specific example of charge balancing processing is provided, as shown, battery cell B2 is to need to carry out
The battery cell of electric voltage equalization, when carrying out charge balancing to battery cell B2, closure switch K3, switch K4 and the second control are opened
It closes, other switches are in an off state (in order to make it easy to understand, the route disconnected is not shown), it can be seen that battery B2, switch
K3, second switch bus, the second control switch, the output end of isolated power supply, first switch bus, switch K4 form one completely
Circuit, and the input terminal of isolated power supply is connect with other battery cells B1, B3, B4 ... Bn, so as to by its in battery pack
The energy transfer of his battery cell is realized and is adjusted to the electric voltage equalization of battery cell B2 to battery cell B2.
Since isolated power supply is by entire battery-powered, suitable voltage value is exported by control isolated power supply, in equilibrium
Biggish euqalizing current can be kept in the process, to improve balancing speed.But the output voltage of isolated power supply cannot be excessive,
The volume that will cause isolated power supply first is larger, and secondly output voltage cannot be beyond the highest safe charging electricity of single battery monomer
Pressure, therefore, the output voltage of isolated power supply can be set to the value more slightly smaller than the highest safe charge voltage of battery cell, protect
While demonstrate,proving balancing speed, it can also prevent from damaging battery.
(6) after the completion of electric voltage equalization processing, return step (1) is repeated the above process, until the variance δ of end voltage2It is less than
Equal to default variance threshold values δ0 2。
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of battery voltage balance control method characterized by comprising
Obtain the end voltage of each battery cell in battery pack；
When determining that the battery pack needs to carry out electric voltage equalization according to the end voltage of each battery cell, determination needs to carry out
The battery cell of electric voltage equalization and balanced type；
When balanced type is charge balancing, the battery cell for carrying out electric voltage equalization is needed to fill to described by isolated power supply
Electrical equalization, the isolated power supply is by described battery-powered.
2. battery voltage balance control method according to claim 1, which is characterized in that when each battery cell
When the variance of voltage being held to be greater than default variance threshold values, determine that the battery pack needs to carry out electric voltage equalization.
3. battery voltage balance control method according to claim 1, which is characterized in that the determining needs carry out electricity
Press balanced battery cell and balanced type, comprising:
When balanced type is charge balancing, determine that the corresponding battery cell of least significant end voltage is the electricity for needing to carry out electric voltage equalization
Pond monomer；
When balanced type is equalization discharge, determine that the corresponding battery cell of most significant end voltage is the electricity for needing to carry out electric voltage equalization
Pond monomer.
4. battery voltage balance control method according to claim 1, which is characterized in that further include: pass through energy consumption member
Part carries out equalization discharge to the corresponding battery cell of the most significant end voltage；
When balanced type is equalization discharge, the battery cell for carrying out electric voltage equalization is needed to put to described by dissipative cell
Electrical equalization.
5. a kind of battery voltage balancing control circuit characterized by comprising
Controller, for obtaining the end voltage of each battery cell in the battery pack；When the end electricity according to each battery cell
When pressure determines that the battery pack needs to carry out electric voltage equalization, the battery cell for needing to carry out electric voltage equalization and balanced class are determined
Type；
Voltage balance circuit is connect with the controller and the battery pack, for passing through when balanced type is charge balancing
Isolated power supply carries out charge balancing to the battery cell for needing to carry out electric voltage equalization, and the isolated power supply is by the battery pack
Power supply.
6. battery voltage balancing control circuit according to claim 5, which is characterized in that the voltage balance circuit is also
For needing the battery cell for carrying out electric voltage equalization to put to described by dissipative cell when balanced type is equalization discharge
Electrical equalization.
7. battery voltage balancing control circuit according to claim 5, which is characterized in that further include: voltage acquisition electricity
Road is connect with the battery pack and the controller, for acquiring the end voltage of each battery cell in the battery pack and sending
To the controller.
8. battery voltage balancing control circuit according to claim 6, which is characterized in that further include: switching circuit, institute
It states voltage balance circuit and is connect by the switching circuit with the battery pack；
The switching circuit includes switch arrays and bus switches, and described switch arrays one end is connect with the battery pack, described
The switch arrays other end is connect with the bus switches, dissipative cell in the bus switches and the voltage balance circuit and
Isolated power supply connection.
9. battery voltage balancing control circuit according to claim 8, which is characterized in that the bus switches include the
One bus switches and second switch bus.
10. battery voltage balancing control circuit according to claim 9, which is characterized in that the isolated power supply it is defeated
Enter end to connect with total anode of the battery pack and total cathode respectively, the output end of the isolated power supply is opened with described first respectively
Bus is closed to connect with second switch bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811247533.4A CN109193863A (en) | 2018-10-25 | 2018-10-25 | Battery voltage balance control method and circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811247533.4A CN109193863A (en) | 2018-10-25 | 2018-10-25 | Battery voltage balance control method and circuit |
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| CN109193863A true CN109193863A (en) | 2019-01-11 |
Family
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Application publication date: 20190111 |