CN105870996A - Voltage balancing circuit of battery pack - Google Patents
Voltage balancing circuit of battery pack Download PDFInfo
- Publication number
- CN105870996A CN105870996A CN201610195700.XA CN201610195700A CN105870996A CN 105870996 A CN105870996 A CN 105870996A CN 201610195700 A CN201610195700 A CN 201610195700A CN 105870996 A CN105870996 A CN 105870996A
- Authority
- CN
- China
- Prior art keywords
- battery
- cell
- equalizing circuit
- switch
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
Abstract
The invention discloses a simple and efficient voltage balancing circuit of a battery pack. Energy of single batteries with high voltages is stored by an external battery; meanwhile, the single batteries with low voltages are charged; and the single batteries and the external battery are connected by a voltage converter, so that the charging and discharging currents are effectively controlled; the universality of the balancing circuit is improved; and the consistency of the balanced voltages of the single batteries is ensured.
Description
Technical field
The present invention relates to battery management circuit, be specifically related to battery equalizing circuit.
Background technology
Battery, as the core of electric automobile, directly influences driving and the peace of electric automobile
Full performance, and the memory capacity of current battery and charge-discharge performance become electric automobile and send out
The bottleneck of exhibition, is typically by multiple low pressure lists as the power battery pack driving electric automobile
Body battery strings, it is formed in parallel, always there are some yet with the cell produced poor
Different so that during using, to there will be the voltage between cell higher or inclined
Low, using if letting alone this imbalance, the voltage between cell can be caused
Difference is increasing, eventually accelerates the capacity attenuation of whole set of cells, exhaustion, more sternly
Weight is that long unbalanced use set of cells may cause the damage of battery, burn,
Even explode, jeopardize property and life security.
In order to eliminate the difference between cell, the most conventional method uses battery exactly
Equilibrium, and battery balanced commonly used approach is in cell two ends or set of cells two
An end resistance in parallel, carrys out the energy of the high cell of attrition voltage by resistance, with
Reach the purpose of battery capacity, electric voltage equalization, although the method can play certain equal
Weighing apparatus effect, but use resistance to be discharged by heating by the energy of cell high for voltage,
Waste the energy content of battery, and the cell that voltage is low is needed again additionally to fill to it
Electricity, inefficient, and also more complicated.
Summary of the invention
In order to solve the problems referred to above, the present invention proposes a kind of simple and highly efficient set of cells electricity
Pressure equalizing circuit, utilizes external connection battery to carry out the cell energy that stored voltage is high, simultaneously
To the cell charging that voltage is low, and use electric pressure converter, control cell
Charging and discharging currents, effectively protect battery, and ensure the voltage after cell equilibrium
Concordance.
For achieving the above object, the technical scheme is that
A kind of battery voltage equalizing circuit, including: the cell of n series connection；Outward
Connect battery, be used for storing and releasing energy；Switch, is used for being connected and disconnected from described monomer
Battery and described external connection battery.
Described battery equalizing circuit also includes controller, for detect cell voltage,
The information such as electric current, and control being connected and disconnected from of described switch.
Electric pressure converter is set between described switch and described external connection battery, or described in open
Close and electric pressure converter is set between described cell.
Described electric pressure converter is bi-directional voltage transducer.
Described electric pressure converter is dc-dc.
Described switch is electrical switch.
Described switch is that multitool puts switch more, connect described n cell with described outside
Connect battery.
Described switch is sequentially connected with first cell with described external connection battery to n-th
Individual cell and described external connection battery, it is achieved the equilibrium of n cell.
Described set of cells is divided into many groups according to its magnitude of voltage, and each group arranges a described electricity
Pond group voltage balance circuit.
Comparing existing battery equalizing circuit, the present invention has remarkable advantage and beneficial effect,
It is embodied as:
1, use the battery voltage equalizing circuit of the present invention, utilize battery storage voltage
Energy that high cell has more to the low cell charging of voltage, it is achieved " cut
Peak load ", save energy；
2, use the battery voltage equalizing circuit of the present invention, use electric pressure converter,
Control battery charging and discharging electric current, effectively protect the service life of battery；
3, use the battery voltage equalizing circuit of the present invention, use electric pressure converter,
Output voltage values can be changed according to demand, multiple battery can be mated；
4, use the battery voltage equalizing circuit of the present invention, only make electricity container and open
Pass realizes battery balanced, reduces the use of components and parts, and circuit is simple and reliable.
5, the battery voltage equalizing circuit of the present invention is used, will according to battery voltage
Set of cells is divided into many groups, often assembles and puts an equalizing circuit, effectively reduces electric pressure,
Reduce the voltage request of each components and parts.
Accompanying drawing explanation
Fig. 1 is the circuit knot of the first embodiment of battery voltage equalizing circuit of the present invention
Structure schematic diagram；
Fig. 2 is the circuit knot of the second embodiment of battery voltage equalizing circuit of the present invention
Structure schematic diagram.
Detailed description of the invention
The specific implementation method of the present invention is as follows:
It is illustrated in figure 1 the first embodiment knot of battery voltage equalizing circuit of the present invention
Structure schematic diagram, wherein B1, B2 ..., Bn are n the cell connected, and K is
Switch put by double-pole more, and b0 is external connection battery, described cell B1, B2 ..., Bn
Put switch K by described double-pole more respectively and be connected to one end of electric pressure converter, described
The other end of electric pressure converter connects described external connection battery b0.
Described battery voltage equalizing circuit also includes controller, is used for detecting cell
Voltage, the information such as electric current, and overall control being connected and disconnected from of described switch K,
Switch K put by described double-pole more can be that electrical switch etc. can be controlled by described controller
The switch that can quickly respond, described switch K can also put switch for multitool more；
Described electric pressure converter is bi-directional voltage transducer, and electric current can be by described cell stream
The electric discharge of described cell is realized to described external connection battery b0, also can be by described external
Battery b0 flows to described cell and realizes the charging of cell, described photovoltaic conversion
Device can be that dc-dc etc. is used for changing voltage between its input and outfan
Device.
Described controller detects SOC value and the magnitude of voltage of n cell in real time, and
SOC value and magnitude of voltage according to n detected cell provide a benchmark
Value, described reference value can on the basis of magnitude of voltage, it is also possible to can clearly judge for other
The parameter index of cell reserve of electricity, described reference voltage value can be n monomer electricity
The meansigma methods of cell voltage value or expected value, it is also possible to for that electricity that occurrence number is most
Pressure value, or can also be for be obtained by additive method；Then from first cell
B1 starts to the n-th cell Bn to check one by one, big for comparing reference voltage value
Cell turn on described switch K and make this cell and described external connection battery b0
Connect, by its additional electricity by the release of described electric pressure converter to described external electricity
Pond b0, turns on the switch of its correspondence for comparing the little cell of reference voltage value,
External connection battery b0 is utilized to be charged to this cell by described voltage converter, finally
Realize the equilibrium of each cell in set of cells；In cell equalization process,
If occurring current monolithic battery to need to charge during described external connection battery b0 electricity deficiency,
Suitably adjustment sequentially, magnitude of voltage can be chosen and be more than the cell of reference voltage value (i.e.
Need the cell of electric discharge) first process, then reprocessing needs the cell of charging,
The electricity that so can utilize set of cells self as far as possible realizes equilibrium, reaches to save energy
Purpose；Described external connection battery can also be given before set of cells is carried out equilibrium treatment
B0 suitably charges, and prevents described external connection battery b0 electricity not enough, particularly when monomer electricity
When pond B1 needs charging, can avoid adjusting processing sequence and the described switch that causes
Repeatedly it is switched on and off, extends the service life of components and parts.
It is illustrated in figure 2 the second embodiment knot of battery voltage equalizing circuit of the present invention
Structure schematic diagram, wherein B1, B2 ..., Bn are n the cell connected, K1,
K2 is that switch put by double-pole more, and b1, b2 are external connection battery, are used for providing battery pack balancing
Required energy storage device, described cell B1, B2 ..., Bn can be divided into many groups,
Realized equilibrium by multiple voltage balance circuits respectively, the present embodiment uses 2 groups, described
Before in set of cells, m the i.e. cell B1 of cell, B2 ..., Bm are by opening
Close K1 be connected to external connection battery b1, rear n-m cell i.e. cell Bm+1,
Bm+2 ..., Bn are connected to external connection battery b2, described switch K1 by switch K2
And between described external connection battery b1, between described switch K2 and described external connection battery b2
It is respectively provided with electric pressure converter.
Described battery equalizing circuit also includes controller, for detect cell voltage,
The information such as electric current, and overall control being connected and disconnected from of described switch, described switch K
Can be many by can quickly responding of controlling of described controller for electrical switch etc.
Switch put by cutter more；Described electric pressure converter is bi-directional voltage transducer, and described voltage is changed
Device can be that dc-dc etc. can change its input and output end voltage value
Device, electric current can be flowed to described external connection battery by described cell and realize described monomer
The electric discharge of battery, also can be flowed to described cell by described external connection battery and realize monomer electricity
The charging in pond.
Switch put by described double-pole more can be that revolving double-pole puts switch, by difference more
The anglec of rotation realize described cell B1, B2 ..., Bn respectively with described voltage
The conducting of transducer, method battery balanced in this embodiment phase basic with first embodiment
With, but use packet that battery cell is carried out equilibrium treatment, it is possible to reduce equilibrium electricity
The electric pressure on road, reduces the requirement to components and parts electric pressure, reduces the one-tenth of components and parts
This, promote the reliability of circuit simultaneously.
The use of described electric pressure converter, it is possible to by adjusting the electricity at its input and output two ends
Pressure ratio example fully realizes the transfer storage of electricity, improves the efficiency of discharge and recharge, simultaneously
The size of current of discharge and recharge can be controlled, it is to avoid the big electric current of set of cells and external connection battery fills
The infringement discharged and cause, substantially increases battery balanced efficiency and reliability.
For for the one exemplary embodiment of the present invention it should be understood that be the right of the present invention
In the protection domain of claim, a certain demonstrative example therein, has this area skill
Art personnel realize the directiveness of corresponding technical scheme and act on, rather than limitation of the invention.
Claims (9)
1. a battery voltage equalizing circuit, it is characterised in that including: n series connection
Cell；External connection battery, is used for storing and releasing energy；Switch, is used for connecting
With the described cell of disconnection and described external connection battery.
Battery voltage equalizing circuit the most according to claim 1, it is characterised in that
Described battery equalizing circuit also includes controller, for detecting the voltage of cell, electricity
The information such as stream, and control being connected and disconnected from of described switch.
Battery voltage equalizing circuit the most according to claim 1, it is characterised in that
Electric pressure converter is set between described switch and described external connection battery, or described switch with
Between described cell, electric pressure converter is set.
Battery voltage equalizing circuit the most according to claim 3, it is characterised in that
Described electric pressure converter is bi-directional voltage transducer.
Battery voltage equalizing circuit the most according to claim 4, it is characterised in that
Described electric pressure converter is dc-dc.
Battery voltage equalizing circuit the most according to claim 1, it is characterised in that
Described switch is electrical switch.
Battery voltage equalizing circuit the most according to claim 6, it is characterised in that
Described switch is that multitool puts switch more, connects described n cell and described external electricity
Pond.
Battery voltage equalizing circuit the most according to claim 7, it is characterised in that
It is single with described external connection battery to n-th that described switch is sequentially connected with first cell
Body battery and described external connection battery, it is achieved the equilibrium of n cell.
Battery voltage equalizing circuit the most according to claims 1 to 8, its feature exists
In, described set of cells is divided into many groups according to its magnitude of voltage, and each group arranges a described electricity
Pond group voltage balance circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610195700.XA CN105870996A (en) | 2016-03-30 | 2016-03-30 | Voltage balancing circuit of battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610195700.XA CN105870996A (en) | 2016-03-30 | 2016-03-30 | Voltage balancing circuit of battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105870996A true CN105870996A (en) | 2016-08-17 |
Family
ID=56627298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610195700.XA Withdrawn CN105870996A (en) | 2016-03-30 | 2016-03-30 | Voltage balancing circuit of battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105870996A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107634273A (en) * | 2016-12-26 | 2018-01-26 | 普天新能源车辆技术有限公司 | The equalizing system and method for electrokinetic cell |
-
2016
- 2016-03-30 CN CN201610195700.XA patent/CN105870996A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107634273A (en) * | 2016-12-26 | 2018-01-26 | 普天新能源车辆技术有限公司 | The equalizing system and method for electrokinetic cell |
| CN107634273B (en) * | 2016-12-26 | 2020-02-21 | 普天新能源车辆技术有限公司 | Balancing system and method for power battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160817 |