CN104882642A - Automobile-used lithium battery module beneficial to realize non-energy-consumption-type electric quantity balance - Google Patents
Automobile-used lithium battery module beneficial to realize non-energy-consumption-type electric quantity balance Download PDFInfo
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- CN104882642A CN104882642A CN201510264432.8A CN201510264432A CN104882642A CN 104882642 A CN104882642 A CN 104882642A CN 201510264432 A CN201510264432 A CN 201510264432A CN 104882642 A CN104882642 A CN 104882642A
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- lithium battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/448—End of discharge regulating measures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses an automobile-used lithium battery module beneficial to realize non-energy-consumption-type electric quantity balance. The automobile-used lithium battery module comprises m battery blocks connected in series in sequence; each battery block comprises n single batteries; the automobile-used lithium battery module is characterized in that switching matrixes are arranged between adjacent battery blocks respectively; each switching matrix at least comprises n*n switches; the positive terminal of a single battery of the front battery block is connected with the negative terminals of the single batteries of the rear battery block through n switches respectively between two adjacent battery blocks; at most one switch in one switching matrix is conducted at the same time. The automobile-used lithium battery module is beneficial to reduce overcharge or overdischarge of each single battery during charge-discharge due to the relatively poor consistency of lithium battery packs, and improves the safety and prolongs the service life of a large-scale integrated lithium battery module.
Description
Technical field
The invention belongs to Vehicular battery field, particularly relate to a kind of vehicle lithium battery module being conducive to realizing non-energy consumption formula electric quantity balancing.
Background technology
Along with making rapid progress of social progress scientific and technical innovation, automobile has become an irreplaceable part in people's life.It has not only promoted the progress of human culture, also in the life changing people at leisure.But the universal of automobile causes environmental pollution day by day serious, and its Air Contamination is the most obvious.Recent years, the paces that automobile enters family are accelerated gradually, and current Chinese motor vehicles for civilian use recoverable amount, more than 100,000,000, exceedes Germany, is only second to the U.S..Meanwhile, Chinese population is numerous, and each big city density of population is very high, causes vehicle exhaust discharge quantity on average higher than other countries.Going from bad to worse of air ambient makes everyone worry, but also in the trend worsened year by year.In addition, along with the increasing of automobile purchase amount, the motor vehicle fuels such as petroleum resources are also faced with day by day exhausted situation.The China of present stage has been faced with the severe challenge of oil shortage, is badly in need of research and development new forms of energy and deals with energy security.Electric automobile strategy has become the decision-making of the emerging strategic industry development of China.
At present in developing electric automobile industry, battery becomes a critical problem of restriction auto cost and course continuation mileage.World-renowned electric automobile manufacturer tesla takes the lead in adopting and uses extensively, and quality 18650 lithium batteries really up to the mark, as the power source of its electric automobile, cause extensive concern in the industry.It is high that 18650 lithium batteries have energy density, technology maturation, low cost and other advantages.But for single cell body, its capacity only only has 2000mAh.Therefore integrated 18650 batteries are in a large number needed could to meet on automobile battery request.In this large amount of integrating process, battery with two side terminals problem is particularly outstanding, how to ensure that in whole system, the consistency of battery capacity makes the life-span of whole battery system and safety obtain the popular problem that maximum guarantee is current research.
In a large lithium battery group, there is the in parallel and series connection of multiple lithium battery.Affect the conforming factor of each cell of Li-ion batteries piles, mainly voltage, internal resistance and capacity etc., wherein voltage is the initial voltage of battery when assembling, and internal resistance is AC internal Resistance when being full of electricity, and capacity is discharge capacity.If the consistency of lithium battery group is poor, the real-time voltage of each battery core when discharge and recharge may be caused to distribute uneven, cause overvoltage to charge or under-voltage electric discharge.The overvoltage charging of lithium ion battery or under-voltage electric discharge can cause side reaction, the service time of battery pack is obviously shortened, and causes safety problem.And the system that integrated level is higher, consistency impact also can be larger.Therefore when designing lithium battery group circuit, all must consider the consistency problem of cell, prior art does not maximize and solves conforming impact.
Summary of the invention
The present invention is directed to existing vehicle lithium battery group each cell consistency poor; cause the lithium battery group shorter problem poor with fail safe service time; a kind of vehicle lithium battery module being conducive to realizing non-energy consumption formula electric quantity balancing is provided; protect every block cell in battery pack, extend the life-span of whole battery pack.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of vehicle lithium battery module being conducive to realizing non-energy consumption formula electric quantity balancing, it comprises m the battery block be connected in series successively, each battery block comprises n and saves cell, be respectively equipped with a switch matrix between adjacent cell block, at least there is in each switch matrix n*n switch; Between adjacent cell block, the positive terminal of a joint cell of previous battery block is connected by the negative terminal often saving cell of n switch with a rear battery block; Synchronization, only has at most a switch conduction in a switch matrix.
By technique scheme, described switch matrix is the integrated switch matrix of MOSFET, is controlled, isolated between the voltage controling end of MOSFET and the control interface of MCU by optical coupler by MCU.
By technique scheme, the S pole of each MOSFET is connected with the positive terminal of one piece of cell of previous battery block, D pole is connected with the negative terminal of all cells of a rear battery block, G is voltage controling end very, and the G pole of MOSFET is isolated by the control interface of optical coupler and MCU.
By technique scheme, between MCU and optical coupler, latch is set, the control interface of MCU is connected with the input of latch, and the output of latch is connected with the input of optical coupler, and the output of optical coupler is connected with the G pole of MOSFET by configuration resistance.
By technique scheme, switch matrix is the integrated switch matrix of MOSFET, controlled by MCU, detailed process comprises, the cell in different battery block with same charge grade is switched to same parallel branch by control switch matrix by MCU, vehicle lithium battery module is become have the parallel circuits of the different dump energy of n bar, after being calculated by MCU, the parallel branch with different electricity is adopted the mode controlled discharge electric current in proportion of pulse width modulation controlled discharge electric current, make all parallel branches reach consistent discharge time.
By technique scheme, before the vehicle lithium battery module being conducive to realizing non-energy consumption formula electric quantity balancing drops into load, dump energy estimation is carried out to the cell in all battery blocks, the number of cell in each battery block according to dump energy be numbered, dump energy is labeled as No. 1 ~ No. n from high to low; The cell in different battery block with identical label is switched to same parallel branch, and monomer cell number of connecting in every bar parallel branch is m; Controlled by MCU, switch matrix near end successively to hot end conducting, by the conducting of n bar parallel branch.
The beneficial effect that the present invention produces is: the vehicle lithium battery module employing that the present invention is conducive to realizing non-energy consumption formula electric quantity balancing is different from traditional battery balanced strategy, form switch matrix form by multiple MOSFET, all cells in battery module can be realized and switch in any parallel branch in battery module.By the estimation of the dump energy to cell, the cell with same levels dump energy is divided in same parallel branch, then adopt discharge control method in proportion to make each bar parallel branch of battery module keep basically identical discharge time to all parallel branches.Vehicle lithium battery module controls efficiency of the present invention is high, operation is simple and reliable, decrease the overcharge or overdischarge problem that cause each cell to cause when discharge and recharge because lithium battery group consistency is poor, the fail safe of the lithium battery module of large-scale integrated and life-span are got a promotion.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the workflow schematic diagram that the embodiment of the present invention is conducive to the vehicle lithium battery module realizing non-energy consumption formula electric quantity balancing;
Fig. 2 is the connection diagram that the embodiment of the present invention is conducive to realizing adjacent cell block in the vehicle lithium battery module of non-energy consumption formula electric quantity balancing;
Fig. 3 is the line map that in the embodiment of the present invention, MCU is controlled optical coupler by latch.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In the embodiment of the present invention, a kind of vehicle lithium battery module being conducive to realizing non-energy consumption formula electric quantity balancing is provided, it comprises m the battery block be connected in series successively, each battery block comprises n and saves cell, be respectively equipped with a switch matrix between adjacent cell block, at least there is in each switch matrix n*n switch; Between adjacent cell block, the positive terminal of a joint cell of previous battery block is connected by the negative terminal often saving cell of n switch with a rear battery block; Synchronization, only has at most a switch conduction in a switch matrix.Each battery block has n positive terminal and n negative terminal.
Wherein, described switch matrix is the integrated switch matrix of MOSFET, is controlled, isolated between the voltage controling end of MOSFET and the control interface of MCU by optical coupler (optocoupler) by MCU.
Described MOSFET is P type MOSFET.Control to manage integrated switch matrix by MOSFET between adjacent cell block, according to the dump energy grade of the cell in battery block, switch and there is the cell of different electricity parallel branch different in lithium battery module, make the electric quantity of single batteries of connecting in every bar parallel branch of lithium battery module roughly equal.Make battery module have n bar cell quantity be m electricity not wait parallel branch.Again by controlling the discharging current of every bar parallel branch in lithium battery module, make reach the longest the discharge time of battery pack.
Wherein, the S pole of each MOSFET is connected with the positive terminal of one piece of cell of previous battery block, D pole is connected with the negative terminal of all cells of a rear battery block, and G is voltage controling end very, and the G pole of MOSFET is isolated by the control interface of optical coupler and MCU.As shown in Figure 2, be the connection diagram that the embodiment of the present invention is conducive to realizing adjacent cell block in the vehicle lithium battery module of non-energy consumption formula electric quantity balancing.
Further, arrange latch between MCU and optical coupler, the control interface of MCU is connected with the input of latch, and the output of latch is connected with the input of optical coupler, and the output of optical coupler is connected with the G pole of MOSFET by configuration resistance.By using latch, MCU control interface can be reduced.As shown in Figure 3, for arranging the schematic diagram of a latch between MCU and optical coupler.If each control interface of MCU controls Y X position latch parallel with one another, then the quantity of the MCU control interface required for n*n MOSFET is n*n/(X*Y).MCU controls the input of optical coupler by I/O mouth, the G pole of output control MOSFET after voltage transitions of optical coupler.
Wherein, in the embodiment of the present invention, MCU is controlled switch matrix by optical coupler, detailed process comprises, the cell in different battery block with same charge grade is switched to same parallel branch by control switch matrix by MCU, vehicle lithium battery module is become have the parallel circuits of the different dump energy of n bar, after being calculated by MCU, the parallel branch with different electricity is adopted the mode controlled discharge electric current in proportion of pulse width modulation controlled discharge electric current, make all parallel branches reach consistent discharge time.
Wherein, as shown in Figure 1, in the embodiment of the present invention, before the vehicle lithium battery module being conducive to realizing non-energy consumption formula electric quantity balancing drops into load, dump energy estimation is carried out to the cell in all battery blocks, the number of cell in each battery block according to dump energy be numbered, dump energy is labeled as No. 1 ~ No. n from high to low; The cell in different battery block with identical label is switched to same parallel branch, and monomer cell number of connecting in every bar parallel branch is m; Controlled by MCU, switch matrix near end successively to hot end conducting, by the conducting of n bar parallel branch.It is No. 1-n number that the electricity that the n bar parallel branch determined has is arranged in order from high to low, by adding current control device at the output of every bar parallel branch, after being calculated by MCU, the parallel branch with different electricity is adopted equal proportion pulse width modulation (PWM) discharge control mode, makes all parallel branches reach consistent discharge time.
In preferred embodiment of the present invention, comprise the latch of 48,8 high speed photo couplings and 32 MOSFET.Wherein, the latch of 48 is arranged between MCU and optical coupler, and each latch is connected in parallel.Its course of work is: 32 inputs being controlled 8 high speed photo couplings by 32 outputs of 4 latchs, can control the G pole of 32 MOSFET by high speed photo coupling after being isolated.The I/O mouth quantity taking MCU is 8+4=12.Expanded by interface, can realize many plates in parallel, a control 32*n MOSFET, meets the requirement of different monomers number of batteries.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (6)
1. one kind is conducive to the vehicle lithium battery module realizing non-energy consumption formula electric quantity balancing, it comprises m the battery block be connected in series successively, each battery block comprises n and saves cell, it is characterized in that: be respectively equipped with a switch matrix between adjacent cell block, at least has n*n switch in each switch matrix; Between adjacent cell block, the positive terminal of a joint cell of previous battery block is connected by the negative terminal often saving cell of n switch with a rear battery block; Synchronization, only has at most a switch conduction in a switch matrix.
2. be according to claim 1ly conducive to the vehicle lithium battery module realizing non-energy consumption formula electric quantity balancing, it is characterized in that: described switch matrix is the integrated switch matrix of MOSFET, controlled by MCU, isolated by optical coupler between the voltage controling end of MOSFET and the control interface of MCU.
3. be according to claim 2ly conducive to the vehicle lithium battery module realizing non-energy consumption formula electric quantity balancing, it is characterized in that, the S pole of each MOSFET is connected with the positive terminal of one piece of cell of previous battery block, D pole is connected with the negative terminal of all cells of a rear battery block, G is voltage controling end very, and the G pole of MOSFET is isolated by the control interface of optical coupler and MCU.
4. be according to claim 3ly conducive to the vehicle lithium battery module realizing non-energy consumption formula electric quantity balancing, it is characterized in that, between MCU and optical coupler, latch is set, the control interface of MCU is connected with the input of latch, the output of latch is connected with the input of optical coupler, and the output of optical coupler is connected with the G pole of MOSFET by configuration resistance.
5. be according to claim 2ly conducive to the vehicle lithium battery module realizing non-energy consumption formula electric quantity balancing, it is characterized in that, switch matrix is the integrated switch matrix of MOSFET, controlled by MCU, detailed process comprises, the cell in different battery block with same charge grade is switched to same parallel branch by control switch matrix by MCU, vehicle lithium battery module is become have the parallel circuits of the different dump energy of n bar, after being calculated by MCU, the parallel branch with different electricity is adopted the mode controlled discharge electric current in proportion of pulse width modulation controlled discharge electric current, all parallel branches are made to reach consistent discharge time.
6. be according to claim 5ly conducive to the vehicle lithium battery module realizing non-energy consumption formula electric quantity balancing, it is characterized in that, before the vehicle lithium battery module being conducive to realizing non-energy consumption formula electric quantity balancing drops into load, dump energy estimation is carried out to the cell in all battery blocks, the number of cell in each battery block according to dump energy be numbered, dump energy is labeled as No. 1 ~ No. n from high to low; The cell in different battery block with identical label is switched to same parallel branch, and monomer cell number of connecting in every bar parallel branch is m; Controlled by MCU, switch matrix near end successively to hot end conducting, by the conducting of n bar parallel branch.
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| CN201510264432.8A CN104882642B (en) | 2015-05-22 | 2015-05-22 | It is advantageously implemented the vehicle lithium battery module of non-energy consumption formula electric quantity balancing |
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| CN201510264432.8A CN104882642B (en) | 2015-05-22 | 2015-05-22 | It is advantageously implemented the vehicle lithium battery module of non-energy consumption formula electric quantity balancing |
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| CN104882642B CN104882642B (en) | 2017-08-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113484756A (en) * | 2021-06-22 | 2021-10-08 | 广州杰赛科技股份有限公司 | Balanced discharge management method for storage battery pack |
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| CN104882642B (en) | 2017-08-22 |
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