CN105162215B - One kind is used for lead-acid batteries distributed battery management system and method in a balanced way - Google Patents
One kind is used for lead-acid batteries distributed battery management system and method in a balanced way Download PDFInfo
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- CN105162215B CN105162215B CN201510687601.9A CN201510687601A CN105162215B CN 105162215 B CN105162215 B CN 105162215B CN 201510687601 A CN201510687601 A CN 201510687601A CN 105162215 B CN105162215 B CN 105162215B
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Abstract
One kind is used for lead-acid batteries distributed battery management system and method in a balanced way, multiple lead-acid accumulators connect to form series connection lead acid storage battery pool unit, a lead-acid batteries are formed after multiple series connection lead acid storage battery pool units are in parallel, the output end of lead-acid batteries is connected to main control unit, each lead-acid accumulator is respectively connected with one from the constant current/constant voltage balancer in control unit, main control unit by being connected from the equalizer switch of control unit with corresponding lead-acid accumulator；Each gathers the output voltage signal of correspondence lead-acid accumulator from control unit and is sent to main control unit in real time, main control unit obtains maximum voltage signal and minimum voltage signal in multiple lead-acid accumulators, when the voltage difference between maximum voltage signal and minimum voltage signal is more than predetermined threshold value, main control unit control constant current/constant voltage balancer and equalizer switch carry out equalization operation to the corresponding lead-acid accumulator of minimum voltage signal.The present invention realizes the combination of cost and circuit reliability.
Description
Technical field
It is used for lead-acid batteries distributed battery in a balanced way the invention belongs to field of new energy technologies, more particularly to one kind
Management system and method.
Background technology
In new energy market, lead-acid accumulator (including lead charcoal battery) occupies critical role always.Lead-acid accumulator
Principle of electrochemical reaction is exactly to convert electrical energy into chemical energy when charging to store in battery, converts chemical energy during electric discharge
External system is supplied for electric energy.
Due to the electrochemical properties of lead-acid accumulator in itself, it is and insensitive for overcharging, crossing clearance for electric current, typically
Be not in burning and explosion phenomenon, this point is different from lithium battery.Therefore, it is considered that, lithium battery group needs external management
Or protection circuit, and lead-acid accumulator and need not such external management or protection and mould is used using a kind of extensive style
Formula.
(1) but the quality conformance of lead-acid accumulator monomer of batch production is often difficult to ensure, such as internal sulfuric acid
Concentration difference directly affects battery cycle life difference, and this causes each battery cell to be had differences in performance；Particularly work as
Battery was used after a period of time, and the otherness between battery cell is more obvious.
(2) during extensive style use, certain lead-acid accumulator monomer was met with when putting, this lead-acid accumulator monomer life-span
Also it can be severely impacted, difference is more obvious between battery cell；
(3) during extensive style use, when certain lead-acid accumulator monomer meets with excessive electric current, battery may accelerated just
The loose of pole brown lead oxide comes off, and this lead-acid accumulator monomer life-span can also be severely impacted, and difference is more between battery cell
Plus substantially；
(4) during extensive style use, when certain lead-acid accumulator monomer experience is overcharged, internal temperature rise, and have big
Gas evolution is measured, positive plate active material may be caused to meet with gas impact and come off, while positive grid alloy can suffer from
Anodic oxidation and corrode, this lead-acid accumulator monomer life-span can also be severely impacted, and difference is more obvious between battery cell；
(5) under high temperature or cryogenic conditions, during extensive style use, if certain lead-acid accumulator monomer carries out work
Make, internal electrochemistry component damages, this lead-acid accumulator monomer life-span can also be severely impacted, difference is more between battery cell
Plus substantially；
(6) during lead-acid accumulator is stored, the self-discharge phenomenon of battery also to create a difference between battery cell；
(4) it is new, old mixed although should prevent lead-acid accumulator from having in lead-acid accumulator, it is new in many occasions
The mixed phenomenon of used batteries remains unchanged presence, causes monomer difference in battery pack obvious；
In summary, when there is battery cell difference, under conditions of no external management, the performance of whole battery strings
Worst battery cell will be limited by, so that overall service efficiency and service life are all pulled low.Serious situation, it is bright in difference
The actual load electric current of two aobvious Battery packs is different, because fuse and the battery pack of whole electric power system Switching Power Supply are one by one
Corresponding, it is possible to have that a Battery pack electric current is excessive and first disconnect, another Battery pack may also be excessive because of load thereafter
And disconnect, and then it is out of service to cause whole electric power system to be forced.
Traditionally the connected mode of multigroup lead-acid accumulator is (so that 3 go here and there 2 simultaneously as an example) as shown in Figure 1, i.e. lead in series connection group
Acid accumulator is interconnected to form series connection by both positive and negative polarity first, is then just connected between different series-connected cell whole groups, bears
It is connected so as to form the parallel connection of whole group, external charge and discharge electrical interface is drawn respectively by the total positive pole of whole group, total negative terminal.It is apparent it
A kind of extensive style " naked use " state is stored in, i.e., without any external management or protection circuit.Therefore one group of lead-acid batteries
In " worst " lead-acid accumulator module will seriously restrict the performance and used life of whole battery pack, this " short -board effect " is in mesh
It is insurmountable in preceding lead-acid accumulator occupation mode.It can only carry out inspecting periodically on working service and replace poor performance
Battery cell, but so cause maintenance workload to increase, particularly a large amount of in use, maintenance cost is high.
And some research institutions are by the mode of lithium battery protection board, electric discharge and charging process to lead-acid accumulator are carried out
Limitation, so that certain protective effect is played to lead-acid accumulator, but this can't lift the overall performance of battery pack；
In addition, mode of some research institutions by lithium battery management system, equilibrium is carried out to lead-acid accumulator, but just
As lithium electric management system, they take centralized solution, i.e. management system complete as a part concentrated and battery pack
Entirely independently, it is attached between them using wire harness, although this mode can ensure the boundary of battery management system and battery pack
Line is clearly demarcated, but wire harness is more, and the assembling for significantly changing current lead-acid accumulator is accustomed to by this, and compactedness and inheritance are bad,
Burden is brought to construction, and the system expandability is bad, i.e., and the battery pack of different string numbers needs different battery management systems.
Although it largely solves " short -board effect " of battery pack, the whole efficiency and service life of battery pack are improved.However,
By this battery management system for lithium battery, then seem for lead-acid accumulator particularly expensive, with cheap plumbic acid
Battery is not matched.
The content of the invention
For the defect of prior art, it is used for lead-acid batteries distributed battery pipe in a balanced way the invention provides one kind
Manage system and method.
To achieve the above objectives, the present invention uses following technical scheme：
One kind is used for lead-acid batteries distributed battery management system, including lead-acid accumulator, main control unit in a balanced way
And connected from control unit, main control unit and between control unit by slave data bus communication；The main control unit bag
Constant current/constant voltage balancer is included, described to include equalizer switch from control unit, multiple lead-acid accumulators connect to form series connection plumbic acid storage
Battery unit, a lead-acid batteries, the output of lead-acid batteries are formed after multiple series connection lead acid storage battery pool units are in parallel
End is connected to main control unit, and the number from control unit is identical with the number of lead-acid accumulator, and each lead-acid accumulator is respectively connected with
One from control unit, and the constant current/constant voltage balancer from the equalizer switch of control unit with corresponding lead-acid accumulator by being connected；
Each is responsible for the output voltage signal of collection correspondence lead-acid accumulator in real time from control unit and is sent to main control unit, the master control
Unit obtains maximum voltage signal and minimum voltage signal in multiple lead-acid accumulators, and judges maximum voltage signal and minimum
Whether the voltage difference between voltage signal is more than predetermined threshold value, when voltage difference is more than predetermined threshold value, the main control unit
The constant current/constant voltage balancer and equalizer switch is controlled to carry out balanced behaviour to the corresponding lead-acid accumulator of minimum voltage signal
Make.
Further, main control unit of the present invention includes main control singlechip and constant current/constant voltage balancer, the perseverance
Stream/constant pressure balancer includes voltage conversion circuit, constant voltage power supply circuit, constant-current power supply circuit and interlock switch, the electricity
The input of voltage conversion circuit is connected with the output end of the lead-acid batteries, the output end of voltage conversion circuit respectively with institute
The input of the input and constant-current supply of stating constant voltage power supply circuit is connected, the output end and perseverance of the constant voltage power supply circuit
The output end for flowing power circuit is connected by an interlock switch with the equalizer switch from control unit.
Further, it is of the present invention to include from control unit from control single-chip microcomputer, equalizer switch and bleeder circuit, the partial pressure
The input of circuit is connected with corresponding lead-acid accumulator both positive and negative polarity, and the output end of bleeder circuit is connected to from control single-chip microcomputer
In A/D converter circuit, the equalizer switch is relay switch, and lead-acid accumulator both positive and negative polarity passes through relay switch and master control list
The constant current/constant voltage balancer connection of member.
Further, it is of the present invention also to include detecting electricity with the relay adhesion being connected from control single-chip microcomputer from control unit
Road.
Further, present invention additionally comprises host computer, the main control unit is drawn upload data/address bus and is connected with host computer.
The present invention, which provides one kind, is used for lead-acid batteries distributed battery management method in a balanced way, comprises the following steps：
When lead-acid batteries are normally run, the real-time output electricity of each lead-acid accumulator in collection lead-acid batteries
Press signal；
Maximum voltage value and minimum amount of voltage that are obtained in lead-acid batteries, and calculates voltage difference between the two
Value；
When voltage difference is more than predetermined threshold value, lead-acid accumulator corresponding to minimum amount of voltage that carries out equalization operation to protect
Demonstrate,prove the equilibrium operating of lead-acid batteries.
Wherein, the process of the equalization operation is：
When the output voltage values of the corresponding lead-acid accumulator of minimum amount of voltage that are less than preset value, constant-current charge is carried out；
When the output voltage values of lead-acid accumulator are more than preset value, constant-voltage charge is switched to by constant-current charge.
The method have the benefit that：
(1) present invention it is a kind of be used for lead-acid batteries in a balanced way distributed battery management system take main control unit and from
Control the part of two separation of unit；
(2) from control unit with lead-acid accumulator (or its parallel combination) is compact links together, and according to battery strings
Several differences can be with arbitrary extension；
(3) it is absorbed in the otherness of lead-acid batteries battery cell during discharge and recharge, use, it is overall from battery pack
Energy is obtained, by first constant current in the pattern of constant pressure, is carried out for worst battery cell balanced；
(4) data/address bus between principal and subordinate's control takes one of LIN buses or 485 buses according to the difference of battery strings number,
Control holistic cost；
(5) equalizer switch on slave controller uses relay, while including relay test circuit, realizes holistic cost
With the combination of circuit reliability.
Brief description of the drawings
Fig. 1 is the connected mode figure of traditionally multigroup lead-acid accumulator
Fig. 2 is structure principle chart of the invention；
Fig. 3 is the structure principle chart of main control unit；
Fig. 4 is the structure principle chart from control unit；
Fig. 5 is the monolithic processor controlled logical flow chart of master control；
Fig. 6 is from the monolithic processor controlled logical flow chart of control.
Embodiment
Reference picture 2, is the structure principle chart of the present invention, the present invention is a kind of to be used for lead-acid batteries distributed electrical in a balanced way
Pond management system, including lead-acid accumulator, host computer, main control unit and from control unit, main control unit and from control unit between
Connected by slave data bus communication；The main control unit is drawn upload data/address bus and is connected with host computer, the master control
Unit includes constant current/constant voltage balancer, and described to include equalizer switch from control unit, multiple lead-acid accumulators connect to form series connection
Lead acid storage battery pool unit, a lead-acid batteries, lead-acid batteries are formed after multiple series connection lead acid storage battery pool units are in parallel
Output end be connected to main control unit, from control unit number it is identical with the number of lead-acid accumulator, each lead-acid accumulator is equal
One is connected with from control unit, the constant current/constant voltage balancer passes through the equalizer switch and corresponding lead acid storage battery from control unit
Pond is connected；Each is responsible for the output voltage signal of collection correspondence lead-acid accumulator in real time from control unit and is sent to main control unit,
The main control unit obtains maximum voltage signal and minimum voltage signal in multiple lead-acid accumulators, and judges that maximum voltage is believed
Whether the voltage difference number between minimum voltage signal is more than predetermined threshold value, described when voltage difference is more than predetermined threshold value
Main control unit controls the constant current/constant voltage balancer and equalizer switch to enter the corresponding lead-acid accumulator of minimum voltage signal
Row equalization operation.
Reference picture 3, is the structure principle chart of main control unit, and the main control unit includes main control singlechip and constant current/perseverance
Press balancer, the constant current/constant voltage balancer include voltage conversion circuit, constant voltage power supply circuit, constant-current power supply circuit with
And interlock switch, the input of the voltage conversion circuit is connected with the output end of the lead-acid batteries, voltage conversion electricity
The output end on road is connected with the input of the constant voltage power supply circuit and the input of constant-current supply respectively, the constant voltage source
The output end of circuit and the output end of constant-current power supply circuit pass through an interlock switch and the equalizer switch from control unit
It is connected.
Wherein：Main control singlechip is as the arithmetic core of main control unit, and many single-chip microcomputers can meet function, this implementation
The STM8S208S6 single-chip microcomputers encapsulated in example using LQFP44.
Voltage conversion circuit on the positive and negative two ends connection main control unit of the principal voltage of lead-acid batteries, voltage conversion electricity
The function on road is to realize to export stable two kinds of voltages of 5V and about 14.5V by total voltage transformation, and wherein 5V voltages give master control list
5V voltage networks are powered on piece machine, and about 14.5V voltages are defeated by constant voltage power supply circuit and constant-current power supply circuit, are used as both
Voltage Reference.Voltage conversion circuit is built based on transformer, there is many implementations in the prior art, is no longer gone to live in the household of one's in-laws on getting married herein
State；
The about 14.5V of voltage conversion circuit output voltage is defeated by constant voltage power supply circuit and constant-current power supply circuit, wherein
The function of constant-current power supply circuit is the fixed electric current of output as needed, and the function of constant voltage power supply circuit is that output is stable
14.5V voltages.For constant voltage power supply circuit and constant-current power supply circuit, there are many implementations in the prior art, herein not
Repeat again.
Main control singlechip and from control single-chip microcomputer between data communication be by 485 buses realize.On main control singlechip
On program burn writing interface, be basic generic configuration.On other main control singlechip spy is used as equipped with two NTC themistors
Head, it is therefore an objective to explore the temperature of lead-acid batteries double sampledly, carries out heat measurement.
Main control singlechip is responsible for being communicated with host computer simultaneously, and main control singlechip, which is drawn, uploads data/address bus and host computer
It is connected, uploads data/address bus and take CAN.
Reference picture 4, is the structure principle chart from control unit, described to include from control unit from control single-chip microcomputer, equalizer switch, divide
Volt circuit and the relay adhesion detection circuit being connected with from control single-chip microcomputer, the input of the bleeder circuit and corresponding lead
Acid accumulator both positive and negative polarity is connected, and the output end of bleeder circuit is connected to from the A/D converter circuit on control single-chip microcomputer, the equilibrium
Switch as relay switch, lead-acid accumulator both positive and negative polarity passes through relay switch and the constant current/constant voltage balancer of main control unit
Connection.
Wherein：From control unit on from control single-chip microcomputer as arithmetic core, many single-chip microcomputers can meet function, this reality
Apply the STM8S003F3 single-chip microcomputers that example uses TSSOP20 to encapsulate.Program burn writing interface from control single-chip microcomputer, is basic general
Configuration.
Described also to include voltage transformation module from control unit, the both positive and negative polarity of lead-acid accumulator is connected to voltage transformation module,
This module is using conventional LM7805 voltage stabilizing chips system and its filter capacitor network, and module output voltage is+5V electricity
Pressure, is connected to the VDD pin of STM8S003F3 single-chip microcomputers, is used as the supply voltage from control single-chip microcomputer.
Bleeder circuit input is connected to during the positive and negative electrodes in same of lead-acid accumulator, purpose herein is the mould because single-chip microcomputer
Number converter AD input voltage is so to need the positive and negative pole tension of lead-acid accumulator that (its highest can reach between 0-5V
To 14.5V) carry out partial pressure, as long as this bleeder circuit ensure 1/3rd voltage, while ensure it is smaller to earth-current,
Realize that the bleeder circuit of such function is a lot, this place takes simple resistance-type partial pressure, branch away voltage access STM8S003F3
The AD pin of single-chip microcomputer.
Reference picture 5, is the monolithic processor controlled logical flow chart of master control, is described as follows：
Including two parts, one is principal function, and one is timer interruption function.
1st, principal function is first to the clock from control single-chip microcomputer, and peripheral hardware etc. is initialized, and then equalizer switch is disconnected, alarm
Deng reset, opening timing device is interrupted, afterwards into major cycle, starts to send instruction from control single-chip microcomputer to serial number i, and judge
From control single-chip microcomputer whether returned data, if 30s does not have returned data, then be recorded as communication abnormality, if receiving data, then
Data processing is carried out to the data received, row is compared to the lead-acid accumulator voltage swing that each is reported from control single-chip microcomputer
Sequence, finds out maximum and minimum value, if difference is more than setting value, then that lead-acid accumulator minimum to voltage sends and opened
Beginning equalization instruction, and open corresponding slave equalizer switch.
2nd, balancing procedure is to be set the need for being reported from control single-chip microcomputer by lead acid storage battery cell voltage in a balanced way less than some
When being worth (such as 14V), then start constant current equilibrium first, perseverance is converted to when this lead acid storage battery cell voltage is higher than some setting value
Pressure is balanced.
If the 3, difference is less than setting value, then the total voltage of detection lead-acid batteries, electric current, and carry out fault detect
The information of lead-acid accumulator, is finally passed through CAN by (such as from control plate relay adhesion or power failure) and troubleshooting
It is sent to vehicle.
4th, timer interruption function is fixed 10ms and interrupted once, mainly judges whether to enter equilibrium state, and timing, when equal
When the weighing apparatus time is more than 60s, sends and close equalization instruction to corresponding from control single-chip microcomputer.
Reference picture 6, is, from the monolithic processor controlled logical flow chart of control, to be described as follows：
Including two parts, one is principal function, and one is timer interruption function.
1st, principal function is first to the clock from control single-chip microcomputer, and peripheral hardware etc. is initialized, and then equalizer switch is disconnected, alarm
Deng reset, opening timing device is interrupted, afterwards into major cycle, and whether cycle criterion receives main control singlechip instruction, receives
Response, does not receive beginning communication overtime and counts.At the same time, the instruction according to main control singlechip carries out switch equalizer switch,
And detect relay failure, lead-acid accumulator brownout fault detect.
2nd, timer interruption function is fixed 10ms and interrupted once, and main task is the sampling to lead acid storage battery cell voltage, meter
Average value is calculated, communication abnormality counts and stores frequency of abnormity to EEPROM.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example.All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It is noted that for the art
Those of ordinary skill for, improvements and modifications under the premise without departing from the principles of the invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (8)
1. one kind is used for lead-acid batteries distributed battery management system in a balanced way, it is characterised in that including lead-acid accumulator,
Main control unit and from control unit, main control unit and from control unit between connected by slave data bus communication；The master
Controlling unit includes constant current/constant voltage balancer, and described to include equalizer switch from control unit, multiple lead-acid accumulators connect to form string
Join lead acid storage battery pool unit, a lead-acid batteries, lead-acid accumulator are formed after multiple series connection lead acid storage battery pool units are in parallel
The output end of group is connected to main control unit, and the number from control unit is identical with the number of lead-acid accumulator, each lead-acid accumulator
One is respectively connected with from control unit, the constant current/constant voltage balancer from the equalizer switch of control unit with corresponding plumbic acid by storing
Battery is connected；Each is responsible for the output voltage signal of collection correspondence lead-acid accumulator in real time from control unit and is sent to master control list
Member, the main control unit obtains maximum voltage signal and minimum voltage signal in multiple lead-acid accumulators, and judges maximum electricity
Press whether the voltage difference between signal and minimum voltage signal is more than predetermined threshold value, when voltage difference is more than predetermined threshold value,
The main control unit controls the constant current/constant voltage balancer and equalizer switch to the corresponding lead acid storage battery of minimum voltage signal
Pond carries out equalization operation.
2. according to claim 1 be used for lead-acid batteries distributed battery management system in a balanced way, it is characterised in that
The main control unit includes main control singlechip and constant current/constant voltage balancer, and the constant current/constant voltage balancer includes voltage
Change-over circuit, constant voltage power supply circuit, constant-current power supply circuit and interlock switch, the input of the voltage conversion circuit with it is described
The output ends of lead-acid batteries is connected, the output end of voltage conversion circuit respectively with the input of the constant voltage power supply circuit with
And the input of constant-current supply is connected, the output end of the constant voltage power supply circuit and the output end of constant-current power supply circuit pass through
One interlock switch is connected with the equalizer switch from control unit.
3. according to claim 1 or 2 be used for lead-acid batteries distributed battery management system in a balanced way, its feature exists
In, it is described to include from control unit from control single-chip microcomputer, equalizer switch and bleeder circuit, the input of the bleeder circuit with it is corresponding
Lead-acid accumulator both positive and negative polarity is connected, and the output end of bleeder circuit is connected to from the A/D converter circuit on control single-chip microcomputer, described equal
Weighing apparatus switch is relay switch, and lead-acid accumulator both positive and negative polarity passes through relay switch dress balanced with the constant current/constant voltage of main control unit
Put connection.
4. according to claim 3 be used for lead-acid batteries distributed battery management system in a balanced way, it is characterised in that
It is described also to include detecting circuit with the relay adhesion being connected from control single-chip microcomputer from control unit.
5. according to claim 4 be used for lead-acid batteries distributed battery management system in a balanced way, it is characterised in that
Main control singlechip uses the STM8S208S6 single-chip microcomputers that LQFP44 is encapsulated.
6. according to claim 5 be used for lead-acid batteries distributed battery management system in a balanced way, it is characterised in that
The STM8S003F3 single-chip microcomputers that TSSOP20 is encapsulated are used from control single-chip microcomputer.
7. according to claim 6 be used for lead-acid batteries distributed battery management system in a balanced way, it is characterised in that
Also include host computer, the main control unit is drawn upload data/address bus and is connected with host computer.
8. one kind is used for lead-acid batteries distributed battery management method in a balanced way, it is characterised in that comprise the following steps：
When lead-acid batteries are normally run, the real-time output voltage letter of each lead-acid accumulator in collection lead-acid batteries
Number；
Maximum voltage value and minimum amount of voltage that are obtained in lead-acid batteries, and calculates voltage difference between the two；
When voltage difference is more than predetermined threshold value, lead-acid accumulator corresponding to minimum amount of voltage that carries out equalization operation to ensure lead
The equilibrium operating of acid accumulator group；The process of wherein described equalization operation：
When the output voltage values of the corresponding lead-acid accumulator of minimum amount of voltage that are less than preset value, constant-current charge is carried out；
When the output voltage values of lead-acid accumulator are more than preset value, constant-voltage charge is switched to by constant-current charge.
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| GB2545923B (en) * | 2015-12-30 | 2019-09-11 | Hyperdrive Innovation Ltd | Battery management system |
| GB201523105D0 (en) | 2015-12-30 | 2016-02-10 | Hyperdrive Innovation Ltd | Battery management system |
| CN107732985B (en) | 2016-08-10 | 2019-11-29 | 宁德时代新能源科技股份有限公司 | Distributed battery management system |
| CN106451638A (en) * | 2016-11-04 | 2017-02-22 | 深圳市佰特瑞储能系统有限公司 | Intelligent mixing apparatus and method for new and old batteries |
| CN106601953B (en) * | 2016-12-19 | 2023-04-18 | 南京九致信息科技有限公司 | Electric automobile trades electric battery compartment device with cooling system |
| 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 |
| CN107284246A (en) * | 2017-07-04 | 2017-10-24 | 无锡英捷汽车科技有限公司 | A kind of electric automobile main contactor failure detector |
| CN107482726A (en) * | 2017-09-01 | 2017-12-15 | 代冰涛 | A kind of active battery charge equalization apparatus of multipurpose multichannel |
| CN109103955A (en) * | 2018-08-17 | 2018-12-28 | 秋玺能源科技（广州）有限公司 | Lead-acid accumulator equilibrium and monitoring method and system |
| CN115347258B (en) * | 2022-10-20 | 2023-03-28 | 北京国电光宇机电设备有限公司 | Repairing system of lead-acid storage battery pack, balancing method and sulfur removal method thereof |
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| CN201656500U (en) * | 2009-01-12 | 2010-11-24 | 北京集能伟业电子科技有限公司 | Voltage monitoring and active balancer of valve-controlled lead-acid battery unit for back-up power |
| CN102035230A (en) * | 2010-11-05 | 2011-04-27 | 安凯 | Equalizing charge control technology of storage battery pack |
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