CN106329641B - A kind of control method and electrokinetic cell system of the charge and discharge of batteries in parallel connection group - Google Patents
A kind of control method and electrokinetic cell system of the charge and discharge of batteries in parallel connection group Download PDFInfo
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- CN106329641B CN106329641B CN201610814147.3A CN201610814147A CN106329641B CN 106329641 B CN106329641 B CN 106329641B CN 201610814147 A CN201610814147 A CN 201610814147A CN 106329641 B CN106329641 B CN 106329641B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000007600 charging Methods 0.000 claims abstract description 67
- 230000005611 electricity Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 description 22
- 238000010586 diagram Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
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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
-
- 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
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of control method and electrokinetic cell system of the charge and discharge of batteries in parallel connection group, wherein batteries in parallel connection group includes a plurality of branch in parallel, and every branch includes controllable switch and at least one battery in a plurality of branch.The control method of the charging includes：Detect the voltage at the battery both ends of every branch in a plurality of branch；A plurality of branch includes the first branch and the second branch, and the first branch is the branch that battery is charging, and the second branch is other branches in addition to the first branch；Determine branch to be charged from the second branch, the ratio of the voltage at the voltage at the battery both ends of branch to be charged and the battery both ends of the first branch is in preset range；The controllable switch of branch to be charged is controlled to be closed, starts to charge up the battery of branch to be charged.The virtual voltage for being capable of accurate judgement battery both ends is poor, and reduces the voltage difference at battery both ends, improves the utilization rate of battery.
Description
Technical field
The present invention relates to power technique fields, and in particular to a kind of control method and power of the charge and discharge of batteries in parallel connection group
Battery system.
Background technology
One important directions of China's hi-tech development, lithium ion battery have when the development and exploitation of lithium ion battery
Many advantages, such as energy density is high, has extended cycle life, and conversion ratio is high replaces lead-acid battery, becomes the first choice of power battery.In order to
Efficiently utilize and the management of realization battery pack are needed to be detected battery, be protected and control.
In this regard, prior art China patent document (publication number：CN105048571A a kind of cell apparatus) is disclosed, is such as schemed
Shown in 1A, which includes the battery modules of multiple parallel connections.As shown in Figure 1B, battery modules include battery, charging MOS
Pipe, electric discharge metal-oxide-semiconductor, current detection module, relay and control module, battery, charging metal-oxide-semiconductor, electric discharge metal-oxide-semiconductor, current detecting
Module, relay series connection.The voltage of control module is connect using input terminal with battery, controls the current sample input terminal and electricity touched
Detection module connection is flowed, the first metal-oxide-semiconductor control output end of control module is connect with charging metal-oxide-semiconductor, the 2nd MOS of control module
Pipe control output end is connect with electric discharge metal-oxide-semiconductor.Current detection module includes current sense resistor RSC.
Before charge, all charging metal-oxide-semiconductors are in opening, and all electric discharge metal-oxide-semiconductors are closed, institute
Some battery modules are all together in parallel by the diode in charging direction allowed inside the metal-oxide-semiconductor that discharges.It starts to charge up, due to electricity
The relationship of competition is pressed, charging current initially enters the minimum battery modules of voltage.It is examined when control module has been detected through overcurrent
The charging current of module is surveyed, electric discharge metal-oxide-semiconductor is placed in opening by control module, will battery modules addition charging sequence in parallel
Row.Until all electric discharge metal-oxide-semiconductors are in opening, all battery modules in parallel chargings are realized.When control module is examined
The voltage for measuring battery reaches overcharge thresholding, and charging metal-oxide-semiconductor is placed in off by control module, charging metal-oxide-semiconductor at this time
The effect of charging is not had；Until all charging metal-oxide-semiconductors are closed, represent that all battery modules bulk charges are complete
Into.In above-mentioned charging process, it is competitive relation due to voltage that the minimum battery modules of voltage, which start to charge up,；Control module is successively
Other batteries in parallel connection modules are added in is whether current detection module detects charging current based on charging sequence in parallel, and
The generation of charging current is also caused by the competitive relation of voltage.
However, in practical application, the phenomenon that battery has voltage virtual height when charging, for example, reality during certain battery standing
Voltage is 30V, when connection power supply, start to charge up moment the battery both ends voltage can moment rise to 31.5V.Therefore, on
The method that corresponding batteries in parallel connection module is just added in charging sequence in parallel when current detection module detects charging current is stated, and
It can not accurately judge battery modules two of the battery modules both ends virtual voltage just to charge with charging to be added sequence in parallel
The difference of virtual voltage is held, thus batteries in parallel connection module just can be added in into charged in parallel in the case where virtual voltage difference is larger
Sequence.For example, the battery virtual voltage of certain battery modules is 250V, its both end voltage can when there is electric current to pass through under charging situation
Can need to rise to 265V, then the battery of the battery modules just can only from 265V when start to charge up, can not be in 250V extremely
It charges when 265V, so as to which battery charging is insufficient, battery utilization rate is not high.
On the other hand, the prior art is before discharge process, and all charging metal-oxide-semiconductors are closed, and all puts
Electric metal-oxide-semiconductor is in opening, the diodes in parallel that all battery modules pass through the course of discharge of permission inside the metal-oxide-semiconductor that charges
Get up.Start to discharge, due to the relationship of voltage competition, the highest battery modules of voltage are discharged at first.When control module is examined
The discharge current by current detection module is measured, charging metal-oxide-semiconductor is placed in opening by control module, will the battery mould
Group adds in electric discharge sequence in parallel.Until all charging metal-oxide-semiconductors are in opening, realize that all battery modules in parallel are put
Electricity.When control module detects that the voltage of battery reaches overdischarge thresholding, electric discharge metal-oxide-semiconductor is placed in off by control module,
Electric discharge metal-oxide-semiconductor at this time does not have the effect of electric discharge；Until all electric discharge metal-oxide-semiconductors are closed, all electricity are represented
Pond module discharges completion.
However, in practical application, when battery discharge, will appear the situation of voltage dip, for example, reality during certain battery standing
Border voltage be 30V, when connection equipment, start electric discharge moment the battery both ends voltage can moment drop to 28.3V.Therefore,
Above-mentioned current detection module detects the method that corresponding batteries in parallel connection module is just added in electric discharge sequence in parallel during discharge current,
It can not accurately judge battery modules of the battery modules both ends virtual voltage just to discharge with electric discharge to be added sequence in parallel
The difference of both ends virtual voltage, thus just can put the addition parallel connection of batteries in parallel connection module in the case where virtual voltage difference is larger
Electric array.For example, the battery virtual voltage of certain battery modules is 250V, under discharge scenario when there is electric current to pass through its both end voltage
May need to drop to 235V, then the battery of the battery modules just can only when 235V discharge, can not be in 235V
It discharges when to 250V, so as to which the battery discharge is insufficient, battery utilization rate is not high.
In conclusion the charging, discharging electric batteries control method of the prior art, empty due to not accounting for voltage when battery charges
The situation of voltage dip during high, electric discharge, leads to that battery capacity is not fully filled or discharge capacity of the cell is smaller, so as to which the energy content of battery utilizes
Rate is relatively low.
Invention content
The technical problem to be solved in the present invention is to overcome in the prior art voltage during due to not accounting for battery charging
The situation of voltage dip when virtual height, electric discharge and battery capacity is caused to be not fully filled or the smaller defect of discharge capacity of the cell.
For this purpose, the present invention provides a kind of control method of batteries in parallel connection group charging, the batteries in parallel connection group includes in parallel
A plurality of branch, every branch includes controllable switch and at least one battery in a plurality of branch；The control method includes：Inspection
Survey the voltage at the battery both ends of every branch in a plurality of branch；The a plurality of branch includes the first branch and the second branch,
The first branch is the branch that battery is charging, and the second branch is other branches in addition to the first branch；
Branch to be charged, voltage and the first branch at the battery both ends of the branch to be charged are determined from the second branch
The ratio of voltage at battery both ends be in preset range；The controllable switch of the branch to be charged is controlled to be closed, is made described
The battery of branch to be charged starts to charge up.
Optionally, when the voltage at the battery both ends of the voltage and first branch at the battery both ends of the branch to be charged
Difference be less than predeterminated voltage difference when, the preset range be 95% to 105%；And/or the electricity when the branch to be charged
When the voltage at pond both ends and the difference of the voltage at the battery both ends of the first branch are more than predeterminated voltage difference, the default model
Enclose is 97% to 103%.
Optionally, described the step of branch to be charged is determined from the second branch, includes：It determines in the second branch
The branch of battery both end voltage minimum；Judge the battery both end voltage of the branch of battery both end voltage minimum in the second branch
Whether the ratio with the voltage at the battery both ends of the first branch is in the preset range；When electric in the second branch
The battery both end voltage of the branch of pond both end voltage minimum and the ratio of the voltage at the battery both ends of the first branch are in institute
When stating in preset range, the branch for determining battery both end voltage minimum in the second branch is branch to be charged.
Optionally, it before in the detection a plurality of branch the step of voltage at the battery both ends of every branch, also wraps
It includes：Battery is judged whether there is to charge；When there is no battery in charging, the branch of battery both end voltage minimum is determined；Control institute
The controllable switch for stating the branch of battery both end voltage minimum is closed, and the battery of the branch of the battery both end voltage minimum is started
Charging.
The present invention also provides a kind of control method of batteries in parallel connection group electric discharge, the batteries in parallel connection group includes a plurality of of parallel connection
Branch, every branch includes controllable switch and at least one battery in a plurality of branch；The control method includes：Detection institute
State the voltage at the battery both ends of every branch in a plurality of branch；The a plurality of branch includes third branch and the 4th branch, described
Third branch is the branch that battery is discharging, and the 4th branch is other branches in addition to the third branch；From institute
It states and branch to be discharged is determined in the 4th branch, the electricity of the voltage at the battery both ends of the branch to be discharged and the third branch
The ratio of the voltage at pond both ends is in preset range；The controllable switch of the branch to be discharged is controlled to be closed, makes described to wait to put
The battery of electric branch starts to discharge.
Optionally, when the voltage at the battery both ends of the branch to be discharged and the voltage at the battery both ends of the third branch
Difference be less than predeterminated voltage difference when, the preset range be 95% to 105%；And/or the electricity when the branch to be discharged
When the voltage at pond both ends and the difference of the voltage at the battery both ends of the third branch are more than predeterminated voltage difference, the default model
Enclose is 97% to 103%.
Optionally, described the step of determining branch to be discharged from the 4th branch, includes：It determines in the 4th branch
The branch of battery both end voltage maximum；Judge the battery both end voltage of the branch of battery both end voltage maximum in the 4th branch
Whether the ratio with the voltage at the battery both ends of the third branch is in the preset range；When electric in the 4th branch
The battery both end voltage of the branch of pond both end voltage maximum and the ratio of the voltage at the battery both ends of the third branch are in institute
When stating in preset range, the branch for determining battery both end voltage maximum in the 4th branch is branch to be discharged.
Optionally, it before in the detection a plurality of branch the step of voltage at the battery both ends of every branch, also wraps
It includes：Battery is judged whether there is to discharge；When there is no battery in electric discharge, the branch of battery both end voltage maximum is determined；Control institute
The controllable switch for stating the branch of battery both end voltage maximum is closed, and the battery of the branch of the battery both end voltage maximum is started
Charging.
Correspondingly, the present invention provides a kind of electrokinetic cell system, including：Batteries in parallel connection group, the batteries in parallel connection group include
A plurality of branch in parallel；Every branch routing relay and at least one battery composition in a plurality of branch；Voltage detector is used
In the voltage for detecting the battery both ends of every branch in a plurality of branch；The a plurality of branch includes the first branch and second
Road, the first branch are the branch that battery is charging, and the second branch is other in addition to the first branch
Road；Processor, for determining branch to be charged, the voltage at the battery both ends of the branch to be charged from the second branch
It is in preset range with the ratio of the voltage at the battery both ends of the first branch；Controller, for determine it is to be charged
After branch, the relay of the branch to be charged is controlled to be closed, starts to charge up the battery of the branch to be charged.
The present invention also provides a kind of electrokinetic cell system, including：Batteries in parallel connection group, the batteries in parallel connection group include in parallel
A plurality of branch；Every branch routing relay and at least one battery composition in a plurality of branch；Voltage detector, for detecting
The voltage at the battery both ends of every branch in a plurality of branch；The a plurality of branch includes third branch and the 4th branch, institute
It is the branch that battery is discharging to state third branch, and the 4th branch is other branches in addition to the third branch；Place
Device is managed, for determining branch to be discharged, the voltage at the battery both ends of the branch to be discharged and institute from the 4th branch
The ratio for stating the voltage at the battery both ends of third branch is in preset range；Controller, for determining branch to be discharged
Afterwards, the relay of the branch to be discharged is controlled to be closed, the battery of the branch to be discharged is made to start to discharge.
Technical solution of the present invention has the following advantages that：
1. the control method of batteries in parallel connection group charging provided by the invention first detects the battery of every branch in a plurality of branch
Then the voltage at both ends determines branch to be charged from the second branch, the voltage at the battery both ends of the branch to be charged and
The ratio of the voltage at the battery both ends of one branch is in preset range, then the controllable switch with charging paths is controlled to be closed, and is made
The battery of branch to be charged starts to charge up.On the one hand, since the voltage of the second branch is measured in the case where branch disconnects
The voltage of the virtual voltage of the voltage at battery both ends, i.e. battery rather than virtual height when thering is the electric current to flow through, therefore this method can be accurate
Really judge the voltage difference at the battery both ends of branch to be charged and the first branch；On the other hand, the battery both ends of branch to be charged
Voltage and the ratio of voltage at battery both ends of first branch when being in preset range, just control the battery with charging paths
It starts to charge up, positive charging paths and the voltage difference at the battery both ends of uncharged branch can be reduced, make battery charging more abundant, carry
The utilization rate of high battery.
2. the control method of batteries in parallel connection group electric discharge provided by the invention first detects the battery of every branch in a plurality of branch
Then the voltage at both ends determines branch to be discharged from the 4th branch, the voltage at the battery both ends of the branch to be discharged and
The ratio of the voltage at the battery both ends of three branches is in preset range, then the controllable switch of belt discharge branch is controlled to be closed, and is made
The battery of branch to be discharged starts to discharge.On the one hand, since the voltage of the 4th branch is measured in the case where branch disconnects
Voltage after the virtual voltage of the voltage at battery both ends, i.e. battery rather than rapid drawdown when thering is the electric current to flow through, therefore this method can
Accurately judge branch to be discharged and the voltage difference at the battery both ends of third branch；On the other hand, the battery two of branch to be discharged
When the voltage at end and the ratio of the voltage at the battery both ends of third branch are in preset range, the electricity of belt discharge branch is just controlled
Pond starts to discharge, and can reduce positive discharge paths and the voltage difference at the battery both ends of non-discharge paths, make battery discharge capacity larger,
Improve the utilization rate of battery.
3. electrokinetic cell system provided by the invention, including batteries in parallel connection group, which includes a plurality of of parallel connection
Branch, every branch only needs relay and at least one battery in a plurality of branch, and circuit structure is simple, convenient for safeguarding；It adopts
It is few with component, it is at low cost.Power battery pack is by the way of in parallel rather than the mode of series connection, when the battery for having a branch goes out
During existing failure, which can still use；Or minimum battery is only needed to change, convenient, fast and section
About cost.In addition, voltage detector, processor and controller perform the control method of above-mentioned batteries in parallel connection group charge and discharge, it can
Reduce the voltage difference at battery both ends, improve the utilization rate of battery.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, can also be obtained according to these attached drawings other attached drawings.
Figure 1A is the circuit structure diagram of cell apparatus in the prior art；
Figure 1B is the circuit structure diagram of battery modules in the prior art；
Fig. 2 is the circuit structure diagram of batteries in parallel connection group in Example 1 and Example 2 of the present invention；
Fig. 3 A are the flow chart of the control method that batteries in parallel connection group charges in the embodiment of the present invention 1；
Fig. 3 B are the particular flow sheet of step S20 in the embodiment of the present invention 1；
The particular flow sheet for the step of Fig. 3 C is before step S10 in the embodiment of the present invention 1；
Fig. 4 A are the flow chart of the control method that batteries in parallel connection group is discharged in the embodiment of the present invention 2；
Fig. 4 B are the particular flow sheet of step S50 in the embodiment of the present invention 2；
The particular flow sheet for the step of Fig. 4 C is before step S40 in the embodiment of the present invention 2；
Fig. 5 is the functional block diagram of the electrokinetic cell system in the embodiment of the present invention 3.
Specific embodiment
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's all other embodiments obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " first ", " second ", " third " are only used for description purpose,
And it is not intended that instruction or hint relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, it can be with
It is the connection inside two elements, can is wireless connection or wired connection.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can be combined with each other into conflict.
Embodiment 1
The present embodiment provides a kind of control methods of batteries in parallel connection group charging.As shown in Fig. 2, batteries in parallel connection group includes parallel connection
A plurality of branch, branch 11 as shown in Figure 2, branch 12 ... branch 1n, every branch includes controllably opening in a plurality of branch
Pass and at least one battery, " battery " herein can be a battery, or the battery pack that multiple batteries are connected in series,
Branch 11 as shown in Figure 2 includes controllable switch Q and battery pack B1.As shown in Figure 3A, which includes the following steps：
S10：Detect the voltage at the battery both ends of every branch in a plurality of branch.The a plurality of branch includes the first branch and the
Two branches, the first branch are the branch that battery is charging, which is other branches in addition to the first branch.
S20：Branch to be charged is determined from the second branch, the voltage at the battery both ends of the branch to be charged and first
The ratio of the voltage at the battery both ends on road is in preset range.
S30：The controllable switch of branch to be charged is controlled to be closed, starts to charge up the battery of branch to be charged.
The control method of above-mentioned batteries in parallel connection group charging first detects the electricity at the battery both ends of every branch in a plurality of branch
Pressure, then determines branch to be charged from the second branch, the voltage at the battery both ends of the branch to be charged and the first branch
The ratio of the voltage at battery both ends is in preset range, then the controllable switch with charging paths is controlled to be closed, and makes branch to be charged
The battery on road starts to charge up.On the one hand, since the voltage of the second branch is the battery both ends that measure in the case where branch disconnects
Voltage, i.e. the virtual voltage of battery rather than the voltage of virtual height when thering is the electric current to flow through, therefore this method can accurately judge
The voltage difference at the battery both ends of branch to be charged and the first branch；On the other hand, the voltage at the battery both ends of branch to be charged with
When the ratio of the voltage at the battery both ends of the first branch is in preset range, the battery with charging paths is just controlled to start to fill
Electricity can reduce positive charging paths and the voltage difference at the battery both ends of uncharged branch, make battery charging more abundant, improve battery
Utilization rate.
As a kind of preferred embodiment of the present embodiment, when the voltage at the battery both ends of branch to be charged and first
The difference of the voltage at the battery both ends on road be less than predeterminated voltage difference when, when being, for example, less than 30V, preset range for 95% to
105%；And/or when the difference of voltage at the battery both ends of the voltage and first branch at the battery both ends of branch to be charged is more than
During predeterminated voltage difference, when being greater than 30V, preset range is 97% to 103%.According to uncharged branch and positive charging paths
Difference difference, adapt to the voltage ratio range that uncharged branch and positive charging paths are treated in adjustment, it can be ensured that positive charging branch
The voltage difference on road and the battery both ends of uncharged branch is smaller, makes battery charging more abundant, improves the utilization rate of battery.
In above-mentioned steps S20, the voltage at the battery both ends of each branch can be obtained successively, then judge the battery of branch
Whether the ratio of the voltage at the battery both ends of both end voltage and the first branch is in preset range, if being in preset range,
It is branch to be charged then to determine the branch.
As a kind of preferred embodiment of the present embodiment, in above-mentioned steps S20, each can also be only obtained every time
Then the branch of battery both end voltage minimum in road judges the voltage at the battery both ends of branch and the battery both ends of the first branch
Whether the ratio of voltage is in preset range, if in preset range, it is determined that the branch is branch to be charged；In next step again
The branch of battery both end voltage minimum in each branch is obtained, recycles above-mentioned steps.Specifically, as shown in Figure 3B, above-mentioned steps
S20 includes step S21, S22 and S23.
S21：Determine the branch of battery both end voltage minimum in the second branch.
S22：Judge the battery both end voltage of branch of battery both end voltage minimum and the electricity of the first branch in the second branch
Whether the ratio of the voltage at pond both ends is in preset range.When the battery of the branch of battery both end voltage minimum in the second branch
When the ratio of the voltage at the battery both ends of both end voltage and the first branch is in preset range, step S23 is performed；Otherwise without behaviour
Make.It should be added that " no operation " described herein refers in the procedure for realizing the present invention, in actual use may be used
According to circumstances to take other operations, the application is not to working as the battery of the branch of battery both end voltage minimum in the second branch
The operation that the ratio of the voltage at the battery both ends of both end voltage and the first branch is done when being not in preset range limits.
S23：The branch for determining battery both end voltage minimum in the second branch is branch to be charged.
As a kind of preferred embodiment of the present embodiment, as shown in Figure 3 C, step is further included before above-mentioned steps S10
S01, S02 and S03.
S01：Battery is judged whether there is to charge.When there is no battery in charging, step S02 is performed, is otherwise continued to execute
Above-mentioned steps S10.
S02：Determine the branch of battery both end voltage minimum.
S03：The controllable switch of the branch of battery both end voltage minimum is controlled to be closed, to the branch of battery both end voltage minimum
Battery start to charge up.
Embodiment 2
The present embodiment provides a kind of control methods of batteries in parallel connection group electric discharge.As shown in Fig. 2, batteries in parallel connection group includes parallel connection
A plurality of branch, branch 11 as shown in Figure 2, branch 12 ... branch 1n, every branch includes controllably opening in a plurality of branch
Pass and at least one battery, " battery " herein can be a battery, or the battery pack that multiple batteries are connected in series,
Branch 11 as shown in Figure 2 includes controllable switch Q and battery pack B1.As shown in Figure 4 A, which includes the following steps：
S40：Detect the voltage at the battery both ends of every branch in a plurality of branch.The a plurality of branch includes third branch and the
Four branches, the third branch are the branch that battery is discharging, and the 4th branch is other branch in addition to the third branch
Road.
S50：Branch to be discharged is determined from the 4th branch, voltage and the third branch at the battery both ends of the branch to be discharged
The ratio of the voltage at the battery both ends on road is in preset range.
S60：The controllable switch of branch to be discharged is controlled to be closed, the battery of branch to be discharged is made to start to discharge.
The control method of above-mentioned batteries in parallel connection group electric discharge first detects the electricity at the battery both ends of every branch in a plurality of branch
Pressure, then determines branch to be discharged from the 4th branch, voltage and the third branch at the battery both ends of the branch to be discharged
The ratio of the voltage at battery both ends is in preset range, then the controllable switch of belt discharge branch is controlled to be closed, and makes branch to be discharged
The battery on road starts to discharge.On the one hand, since the voltage of the 4th branch is the battery both ends that measure in the case where branch disconnects
Voltage, i.e. voltage after the virtual voltage of battery rather than rapid drawdown when thering is the electric current to flow through, therefore this method can accurately be sentenced
Disconnected branch to be discharged and the voltage difference at the battery both ends of third branch；On the other hand, the voltage at the battery both ends of branch to be discharged
When being in preset range with the ratio of the voltage at the battery both ends of third branch, just the battery of belt discharge branch is controlled to start to put
Electricity can reduce positive discharge paths and the voltage difference at the battery both ends of non-discharge paths, make battery discharge capacity larger, improve battery
Utilization rate.
As a kind of preferred embodiment of the present embodiment, when voltage and the third branch at the battery both ends of branch to be discharged
When the difference of the voltage at the battery both ends on road is less than predeterminated voltage difference, preset range is 95% to 105%；And/or when waiting to put
When the voltage at the battery both ends of electric branch and the difference of the voltage at the battery both ends of third branch are more than predeterminated voltage difference, preset
Ranging from 97% to 103%.
In above-mentioned steps S50, the voltage at the battery both ends of each branch can be obtained successively, then judge the battery of branch
Whether both end voltage and the ratio of the voltage at the battery both ends of third branch are in preset range, if in preset range,
It is branch to be discharged then to determine the branch.
As a kind of preferred embodiment of the present embodiment, in above-mentioned steps S50, each can also be only obtained every time
Then the branch of battery both end voltage maximum in road judges the voltage at the battery both ends of branch and the battery both ends of third branch
Whether the ratio of voltage is in preset range, if in preset range, it is determined that the branch is branch to be discharged；In next step again
The branch of battery both end voltage maximum in each branch is obtained, recycles above-mentioned steps.Specifically, as shown in Figure 4 B, above-mentioned steps
S50 includes step S51, S52 and S53.
S51：Determine the branch of battery both end voltage maximum in the 4th branch.
S52：Judge the battery both end voltage of the branch of battery both end voltage maximum and the electricity of third branch in the 4th branch
Whether the ratio of the voltage at pond both ends is in preset range.When the battery of the branch of battery both end voltage maximum in the 4th branch
When both end voltage and the ratio of the voltage at the battery both ends of third branch are in preset range, step S53 is performed；Otherwise without behaviour
Make.It should be added that " no operation " described herein refers in the procedure for realizing the present invention, in actual use may be used
According to circumstances to take other operations, the application is not to when the battery of the branch of battery both end voltage maximum in the 4th branch
The operation that both end voltage and the ratio of the voltage at the battery both ends of third branch are done when being not in preset range limits.
S53：The branch for determining battery both end voltage maximum in the 4th branch is branch to be discharged.
As a kind of preferred embodiment of the present embodiment, as shown in Figure 4 C, step is further included before above-mentioned steps S40
S04, S05 and S06.
S04：Battery is judged whether there is to discharge.When there is no battery in electric discharge, step S05 is performed；Otherwise it continues to execute
Step S40.
S05：Determine the branch of battery both end voltage maximum.
S06：The controllable switch of the branch of battery both end voltage maximum is controlled to be closed, to the branch of battery both end voltage maximum
Battery start to charge up.
Embodiment 3
The present embodiment provides a kind of electrokinetic cell system, as shown in figure 5, including batteries in parallel connection group 1,2 and of voltage detector
Controller 3.
The batteries in parallel connection group 1 includes a plurality of branch in parallel, and branch 11 as shown in Figure 5, branch 12 ... branch n should
Every branch includes relay and at least one battery in a plurality of branch, and " battery " herein can be a battery, can also
For the battery pack that multiple batteries are connected in series, branch 11 as shown in Figure 5 includes relay Q and battery pack B1.
(1) in a charging situation：
Voltage detector 2, for detecting the voltage at the battery both ends of every branch in a plurality of branch.A plurality of branch includes the
One branch and the second branch, the first branch are the branch that battery is charging, which is in addition to the first branch
Other branches.
Processor 3, for determining branch to be charged from the second branch, the voltage at the battery both ends of the branch to be charged
It is in preset range with the ratio of the voltage at the battery both ends of the first branch.Preferably, when the battery both ends of branch to be charged
Voltage and the first branch battery both ends voltage difference be less than predeterminated voltage difference when, when being, for example, less than 30V, preset model
Enclose is 95% to 105%；And/or when the battery both ends of branch to be charged the voltage and first branch battery both ends voltage
Difference be more than predeterminated voltage difference when, when being greater than 30V, preset range be 97% to 103%.According to uncharged branch with
The difference of the difference of positive charging paths adapts to adjustment and treats uncharged branch and the voltage ratio range of positive charging paths, can be true
It protects positive charging paths and the voltage difference at the battery both ends of uncharged branch is smaller, make battery charging more abundant, improve the profit of battery
With rate.
Controller 4, the relay for after branch to be charged is determined, controlling branch to be charged are closed, make to be charged
The battery of branch starts to charge up.
Processor 3 can obtain the voltage at the battery both ends of each branch successively, then judge the battery both ends electricity of branch
Whether pressure and the ratio of the voltage at the battery both ends of the first branch are in preset range, if in preset range, it is determined that
The branch is branch to be charged.
As a kind of preferred embodiment of the present embodiment, processor 3 can also only obtain electric in each branch every time
Then the branch of pond both end voltage minimum judges the voltage at the battery both ends of branch and the voltage at the battery both ends of the first branch
Whether ratio is in preset range, if in preset range, it is determined that the branch is branch to be charged；It obtains again in next step each
The branch of battery both end voltage minimum in a branch recycles above-mentioned steps.
Before the voltage that the battery both ends of every branch are detected in voltage detector 2, processor 3 judges whether there is battery and exists
Charging when not having battery in charging, determines the branch of battery both end voltage minimum, and then controller 4 controls battery both ends
The relay of the branch of voltage minimum is closed, and the battery of the branch of battery both end voltage minimum is started to charge up.
(2) alternatively, under discharge scenario：
Voltage detector 2, for detecting the voltage at the battery both ends of every branch in a plurality of branch.A plurality of branch includes the
Three branches and the 4th branch, the third branch are the branch that battery is discharging, and the 4th branch is in addition to third branch
Other branches.
Processor 3, for determining branch to be discharged from the 4th branch, the voltage at the battery both ends of the branch to be discharged
It is in preset range with the ratio of the voltage at the battery both ends of third branch.Preferably, when the battery both ends of branch to be discharged
The difference of voltage at battery both ends of voltage and third branch when being less than predeterminated voltage difference, when being, for example, less than 30V, preset model
Enclose is 95% to 105%；And/or when the battery both ends of branch to be discharged voltage and third branch battery both ends voltage
Difference be more than predeterminated voltage difference when, when being greater than 30V, preset range be 97% to 103%.According to non-discharge paths with
The difference of the difference of positive discharge paths adapts to the voltage ratio range that non-discharge paths and positive discharge paths are treated in adjustment, can be true
It protects positive discharge paths and the voltage difference at the battery both ends of non-discharge paths is smaller, make battery discharge more abundant, improve the profit of battery
With rate.
Controller 4, the relay for after branch to be discharged is determined, controlling branch to be discharged are closed, make to be discharged
The battery of branch starts to discharge.
Processor 3 can obtain the voltage at the battery both ends of each branch successively, then judge the battery both ends electricity of branch
Whether pressure and the ratio of the voltage at the battery both ends of third branch are in preset range, if in preset range, it is determined that
The branch is branch to be discharged.
As a kind of preferred embodiment of the present embodiment, processor 3 can also only obtain electric in each branch every time
Then the branch of pond both end voltage maximum judges the voltage at the battery both ends of branch and the voltage at the battery both ends of third branch
Whether ratio is in preset range, if in preset range, it is determined that the branch is branch to be discharged；It obtains again in next step each
The branch of battery both end voltage maximum in a branch recycles above-mentioned steps.
Before the voltage that the battery both ends of every branch are detected in voltage detector 2, processor 3 judges whether there is battery and exists
Electric discharge when not having battery in electric discharge, determines the branch of battery both end voltage maximum, and then controller 4 controls battery both ends
The relay of the branch of voltage maximum is closed, and the battery of the branch of battery both end voltage maximum is started to charge up.
It should be added that used voltage detector 2, processor 3 and control in the case of above-mentioned charging and discharging
Device 4 processed can be individual module or unit or be integrated in a management system, such as battery management system
(Battery Management System, BMS).In special circumstances, it can also only be realized by a processor or controller
The function of above-mentioned voltage detector 2, processor 3 and controller 4, the present invention do not limit the division of above-mentioned function.
Above-mentioned electrokinetic cell system, including batteries in parallel connection group, which includes a plurality of branch in parallel, this is a plurality of
Every branch only needs relay and at least one battery in branch, and circuit structure is simple, convenient for safeguarding；It is few using component,
It is at low cost.Power battery pack, should when the battery for having a branch breaks down by the way of in parallel rather than the mode of series connection
Electrokinetic cell system can still use；Or minimum battery is only needed to change, it is convenient, fast and cost-effective.In addition,
Voltage detector, processor and controller perform the control method described in Examples 1 and 2, can reduce the voltage at battery both ends
Difference improves the utilization rate of battery.
Preferably, above-mentioned battery is made of the battery core of two or more series connection.
Obviously, the above embodiments are merely examples for clarifying the description, and is not intended to limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation thus extended out or
Among changing still in the protection domain of the invention.
Claims (6)
1. a kind of control method of batteries in parallel connection group charging, which is characterized in that the batteries in parallel connection group includes a plurality of branch in parallel
Road, every branch includes controllable switch and at least one battery in a plurality of branch；The control method includes：
Detect the voltage at the battery both ends of every branch in a plurality of branch；The a plurality of branch includes the first branch and second
Branch, the first branch are the branch that battery is charging, and the second branch is other in addition to the first branch
Branch；
Branch to be charged, the voltage at the battery both ends of the branch to be charged and described first are determined from the second branch
The ratio of the voltage at the battery both ends of branch is in preset range；
The controllable switch of the branch to be charged is controlled to be closed, starts to charge up the battery of the branch to be charged；
When the difference of the voltage at the battery both ends of the voltage and first branch at the battery both ends of the branch to be charged is less than
During predeterminated voltage difference, the preset range is 95% to 105%；
And/or
When the difference of the voltage at the battery both ends of the voltage and first branch at the battery both ends of the branch to be charged is more than
During predeterminated voltage difference, the preset range is 97% to 103%.
2. the control method of batteries in parallel connection group charging according to claim 1, which is characterized in that from the second branch
The step of determining branch to be charged includes：
Determine the branch of battery both end voltage minimum in the second branch；
Judge the electricity of the battery both end voltage of the branch of battery both end voltage minimum and the first branch in the second branch
Whether the ratio of the voltage at pond both ends is in the preset range；
When the battery of the battery both end voltage of the branch of battery both end voltage minimum and the first branch in the second branch
When the ratio of the voltage at both ends is in the preset range, the branch of battery both end voltage minimum in the second branch is determined
For branch to be charged.
3. the control method of batteries in parallel connection group charging according to claim 1, which is characterized in that the detection is described a plurality of
In branch the step of the voltage at the battery both ends of every branch before, further include：
Battery is judged whether there is to charge；
When there is no battery in charging, the branch of battery both end voltage minimum is determined；
The controllable switch of the branch of the battery both end voltage minimum is controlled to be closed, to the branch of the battery both end voltage minimum
Battery start to charge up.
4. a kind of control method of batteries in parallel connection group electric discharge, which is characterized in that the batteries in parallel connection group includes a plurality of branch in parallel
Road, every branch includes controllable switch and at least one battery in a plurality of branch；The control method includes：
Detect the voltage at the battery both ends of every branch in a plurality of branch；The a plurality of branch includes third branch and the 4th
Branch, the third branch are the branch that battery is discharging, and the 4th branch is other in addition to the third branch
Branch；
Branch to be discharged, voltage and the third at the battery both ends of the branch to be discharged are determined from the 4th branch
The ratio of the voltage at the battery both ends of branch is in preset range；
The controllable switch of the branch to be discharged is controlled to be closed, the battery of the branch to be discharged is made to start to discharge；
When the difference of the voltage and the voltage at the battery both ends of the third branch at the battery both ends of the branch to be discharged is less than
During predeterminated voltage difference, the preset range is 95% to 105%；
When the difference of the voltage and the voltage at the battery both ends of the third branch at the battery both ends of the branch to be discharged is more than
During predeterminated voltage difference, the preset range is 97% to 103%.
5. the control method of batteries in parallel connection group electric discharge according to claim 4, which is characterized in that from the 4th branch
The step of determining branch to be discharged includes：
Determine the branch of battery both end voltage maximum in the 4th branch；
Judge the battery both end voltage of the branch of battery both end voltage maximum and the electricity of the third branch in the 4th branch
Whether the ratio of the voltage at pond both ends is in the preset range；
When the battery both end voltage of the branch of battery both end voltage maximum in the 4th branch and the battery of the third branch
When the ratio of the voltage at both ends is in the preset range, the branch of battery both end voltage maximum in the 4th branch is determined
For branch to be discharged.
6. the control method of batteries in parallel connection group electric discharge according to claim 4, which is characterized in that the detection is described a plurality of
In branch the step of the voltage at the battery both ends of every branch before, further include：
Battery is judged whether there is to discharge；
When there is no battery in electric discharge, the branch of battery both end voltage maximum is determined；
The controllable switch of the branch of the battery both end voltage maximum is controlled to be closed, to the branch of the battery both end voltage maximum
Battery start to discharge.
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| CN106712221A (en) * | 2017-03-13 | 2017-05-24 | 四川力垦锂动力科技有限公司 | Charging and discharging management circuit of lithium ion storage battery |
| CN106953391A (en) * | 2017-05-09 | 2017-07-14 | 上海电气集团股份有限公司 | Battery pack parallel charge-discharge device and charge/discharge control method |
| CN109904903A (en) * | 2017-12-08 | 2019-06-18 | 南京德朔实业有限公司 | Power supply device and charging method |
| CN108512269A (en) * | 2018-03-14 | 2018-09-07 | 深圳市爱克斯达电子有限公司 | A kind of cell parallel balancing device and charge/discharge control method |
| CN113561846A (en) * | 2020-04-29 | 2021-10-29 | 微宏动力系统（湖州）有限公司 | Battery pack charging control method and battery pack discharging control method |
| CN114274841B (en) * | 2021-08-09 | 2023-05-23 | 中车资阳机车有限公司 | Parallel direct-hanging control method for multi-branch power battery system |
| CN113708441B (en) * | 2021-08-12 | 2024-09-03 | 三一海洋重工有限公司 | Power battery control method and device and electric stacker |
| CN114336866A (en) * | 2021-12-31 | 2022-04-12 | 联想(北京)有限公司 | Battery control method and electronic equipment |
| CN114243877B (en) * | 2022-02-28 | 2022-05-17 | 深圳市德兰明海科技有限公司 | Battery pack parallel lapping method and system and readable storage medium |
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| CN101877424A (en) * | 2009-04-30 | 2010-11-03 | 上海易狄欧电子科技有限公司 | Charging and discharging method and system for battery pack |
| CN102480142B (en) * | 2010-11-26 | 2015-07-22 | 比亚迪股份有限公司 | Battery pack parallel charging device and parallel charging method thereof |
| WO2013127099A1 (en) * | 2012-02-28 | 2013-09-06 | 智晖有限公司 | Method for charge balancing and load control in parallel battery packs |
| CN104167770B (en) * | 2013-07-19 | 2017-07-28 | 郑州宇通客车股份有限公司 | A kind of battery power discharge control method and charge control method |
| CN103795124A (en) * | 2014-02-19 | 2014-05-14 | 中达电通股份有限公司 | Control system for realizing parallel-connection circulating charging of multiple sets of lithium batteries and method thereof |
| CN105048571B (en) * | 2015-08-03 | 2018-02-27 | 成都宇能通能源开发有限公司 | A kind of circuit and its method for realizing multiple battery pack complete alternation discharge and recharges |
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