CN104037881A - Electric vehicle battery equalization control method and control method thereof - Google Patents
Electric vehicle battery equalization control method and control method thereof Download PDFInfo
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- CN104037881A CN104037881A CN201410277054.2A CN201410277054A CN104037881A CN 104037881 A CN104037881 A CN 104037881A CN 201410277054 A CN201410277054 A CN 201410277054A CN 104037881 A CN104037881 A CN 104037881A
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- 230000009897 systematic effect Effects 0.000 claims description 9
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Abstract
The invention discloses an electric vehicle battery equalization control system. The electric vehicle battery equalization control system comprises a controller, a battery pack, a battery voltage acquiring module and a power source module, wherein the controller and the battery pack are connected via a balancing block, and an input end of the controller is connected with the battery voltage acquiring module. The electric vehicle battery equalization control system has the advantages that 1, two battery cells in each balancing group are needed in same time, namely two groups of balancing are performed in the same time, efficiency is improved, and balancing modes can be almost implemented in one step in a static process; 2, each balancing subprogram is provided with instruction for controlling on and off of an LED, when the LED indicator lamp is lighted on, the balancer works, and otherwise, a surface balancer finishes working and is in a no-working state when the LED lights out.
Description
Technical field
The present invention relates to electric car power supply control technology, particularly a kind of batteries of electric automobile balance control system and control method thereof.
Background technology
At present, the battery pack being composed in series by the single battery of 4 joint 12V is widely used in the electrokinetic cell of electric motor car, due to the impact of battery manufacturing process factor, make between the parameter monomers such as its capacity, internal resistance consistency variant, the difference that has caused monoblock battery performance, in use for some time, the otherness between single battery can become greatly battery pack, further affects performance and the life-span of battery simultaneously.Balance control system, by the electric weight between balanced each batteries, is avoided in discharge process, and it is undue to occur, in charging process, occurs overcharging, and realizes the consistency of battery capacity as far as possible, thereby extends the life of a cell.
Summary of the invention
Technical problem to be solved by this invention is, for the deficiencies in the prior art, provides a kind of electric weight between can each batteries of efficient balance, improves the performance of battery and electric automobile balance control system and the control method thereof in life-span.
For solving the problems of the technologies described above, the technical scheme the present invention relates to is: a kind of batteries of electric automobile balance control system, comprise controller, battery pack, cell voltage acquisition module, power module, between described controller and battery pack, by balance module, be connected, the input of described controller is connected with cell voltage acquisition module.
Described balance module comprises the switching network consisting of field-effect transistor, the capacitance network consisting of electric capacity, utilizes electric capacity to realize the transfer of electric weight between different monomers.
Described controller, for respectively save the voltage signal of cell according to the battery pack of cell voltage acquisition module collection, by utilizing each batteries voltage of capacitor charge and discharge regulating cell group of capacitance network, makes each batteries voltage swing consistent.Be specially, when monomer voltage being detected, exceed after global voltage mean value, utilize capacitance network that electric capacity is in parallel with this monomer, battery cell is to capacitor charging, after capacitance voltage is consistent with cell voltage, the switching network that utilizes field-effect transistor to form, the cell that electric capacity is minimum with cell voltage is in parallel, and electric capacity will charge to cell.So process ceaselessly repeats, and realizes the high energy content of battery of monomer voltage is carried out to energy supplement by electric capacity to the low battery of monomer battery voltage, and the battery that while effectively avoiding discharging, voltage is low is crossed and put.During charging, the over-charging of battery that monomer voltage is high.Further improve battery and use cycle life.
Described power module is, by power supply chip, battery voltage is become to 5V voltage, to controller, provides operating voltage.
The output of described controller is connected with indicator light.
Described controller adopts single-chip microcomputer, and its model is XC866.
Described controller is connected with jtag interface.
Described battery pack is four batteries.
A control method for batteries of electric automobile balance control system, described method comprises the following steps:
A) system is divided into Liang Ge group by battery pack, gather the voltage at the single battery two ends of each group, relatively the single battery voltage sum of the first group and the single battery voltage sum of the second group, shift electric weight until the voltage between two groups equates or is close to the low group of voltage from the high group of voltage;
B) voltage difference between each batteries in each group of systematic comparison, shifts electric weight until voltage between the two equates or is close to the low battery of voltage from the high single battery of voltage;
Step a), b) in electric energy transfer process in system light indicator light.
Described method comprises following two stages:
First stage system is divided into Liang Ge group battery pack, the first single battery is 1# group with connecting of the second single battery, the 3rd single battery is 2# group with connecting of the 4th single battery, by data acquisition, can obtain the voltage at each single battery two ends, then compare the size of the first single-unit and the second single battery sum V1 and the 3rd single-unit and the 4th single battery sum V2, if V1>V2, the electric energy of 1# group is to the electric energy transfer of 2# group until the energy between two groups is equal; On the contrary, if V2>V1, the electric energy of 2# group is to the electric energy transfer of 1# group until the energy between two groups is equal;
Voltage difference in second stage systematic comparison 1# group between each batteries, electric weight is shifted until electric energy between the two equates to the low battery of electric energy from the high single battery of electric energy, voltage difference in systematic comparison 2# group between each batteries, shifts electric weight until electric energy between the two equates to the low battery of electric energy from the high single battery of electric energy.
The present invention adopts said structure and method, have the following advantages: 1, equilibrium of the present invention is top-down, one direction formula, the i.e. first electric energy between balanced two groups, in respectively balanced each group group two saves cells again, and the equilibrium between the joint of two in each group group cell can be carried out simultaneously.The time has been shortened in one-way fashion equilibrium, and two joint cells in only needing separately balanced group in the same time, the same time can be carried out two groups of equilibriums, has improved efficiency.In static process, above-mentioned balanced way almost can settle at one go; 2, in each balanced subprogram, there is the instruction of controlling LED light on and off, so if LED light is lighted, show that equalizer just at work; On the contrary, if LED extinguishes, surperficial equalizer equalizes is complete, in lack of balance operating state, is easy to system running state to monitor.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation;
Fig. 1 is logical construction block diagram of the present invention;
Fig. 2 is structured flowchart of the present invention;
Fig. 3 is the circuit diagram of balance module in the present invention;
Fig. 4 is the software flow pattern of the voltage of four batteries of system equalization battery pack in the present invention;
In Fig. 1～Fig. 2,1, controller; 2, cell voltage acquisition module; 3, balance module.
Embodiment
A kind of batteries of electric automobile balance control system as shown in Figure 1 to 4, comprise controller 1, battery pack, cell voltage acquisition module 2, power module, between controller 1 and battery pack, by balance module 3, be connected, the input of controller 1 is connected with cell voltage acquisition module 2.Balance module 3 comprises the switching network consisting of field-effect transistor, the capacitance network consisting of electric capacity, as shown in Figure 3.
Controller, for respectively save the voltage signal of cell according to the battery pack of cell voltage acquisition module collection, by utilizing each batteries voltage of capacitor charge and discharge regulating cell group of capacitance network, makes each batteries voltage swing consistent.Be specially, when monomer voltage being detected, exceed after global voltage mean value, utilize capacitance network that electric capacity is in parallel with this monomer, battery cell is to capacitor charging, after capacitance voltage is consistent with cell voltage, the switching network that utilizes field-effect transistor to form, the cell that electric capacity is minimum with cell voltage is in parallel, and electric capacity will charge to cell.So process ceaselessly repeats, and realizes the high energy content of battery of monomer voltage is carried out to energy supplement by electric capacity to the low battery of monomer battery voltage, and the battery that while effectively avoiding discharging, voltage is low is crossed and put.During charging, the over-charging of battery that monomer voltage is high.Further improve battery and use cycle life.Power module is, by power supply chip, battery voltage is become to 5V voltage, to controller, provides operating voltage.
The output of controller is connected with indicator light, and indicator light is LED light.Controller adopts single-chip microcomputer, and its model is XC866.Controller is connected with jtag interface.Battery pack is four batteries.The power supply of single-chip microcomputer XC866 and voltage conversion circuit power supply all utilize NCS1002 to realize, voltage conversion circuit consists of high-performance AD conversion unit A/D, this high-performance analog-to-digital conversion unit A/D is comprised by single-chip microcomputer XC866 inside, the present invention has used four paths of A/D, for gathering the voltage of four batteries.Equalizing circuit module adopts electric capacity as energy-storage travelling wave tube, has realized the lossless of energy.Equalizing circuit module is by utilizing field-effect transistor to control being connected of battery and electric capacity, by electric capacity, discharges and recharges to realize the balanced of cell voltage.
A control method for batteries of electric automobile balance control system, described method comprises the following steps:
A) system is divided into Liang Ge group by battery pack, gather the voltage at the single battery two ends of each group, relatively the single battery voltage sum of the first group and the single battery voltage sum of the second group, shift electric weight until the voltage between two groups equates or is close to the low group of voltage from the high group of voltage;
B) voltage difference between each batteries in each group of systematic comparison, shifts electric weight until voltage between the two equates or is close to the low battery of voltage from the high single battery of voltage;
Step a), b) in electric energy transfer process in system light indicator light.
Method comprises following two stages:
First stage system is divided into Liang Ge group battery pack, the first single battery is 1# group with connecting of the second single battery, the 3rd single battery is 2# group with connecting of the 4th single battery, by data acquisition, can obtain the voltage at each single battery two ends, then compare the size of the first single-unit and the second single battery sum V1 and the 3rd single-unit and the 4th single battery sum V2, if V1>V2, the electric energy of 1# group is to the electric energy transfer of 2# group until the energy between two groups is equal; On the contrary, if V2>V1, the electric energy of 2# group is to the electric energy transfer of 1# group until the energy between two groups is equal.Now, 48V single battery and the voltage between 36V single battery between 1# group are probably unequal, at this moment two single batteries in 1# group are continued balanced just passable again.Like this equally for the 24V single battery between 2# group and 12V single battery, when unequal, can make the voltage difference of the two by equilibrium is zero.
Voltage difference in second stage systematic comparison 1# group between each batteries, electric weight is shifted until electric energy between the two equates to the low battery of electric energy from the high single battery of electric energy, voltage difference in systematic comparison 2# group between each batteries, shifts electric weight until electric energy between the two equates to the low battery of electric energy from the high single battery of electric energy.
In the present invention, voltage acquisition module obtains after the information of voltage of each batteries, the capacitance network of Single-chip Controlling balance module and switching network realize to single battery carry out one to one, many-one, group regulate one electric quantity balancing, electric weight size between each single battery is consistent, thereby improves performance and the life-span of battery.
Equilibrium of the present invention is top-down, one direction formula, i.e. electric energy between first balanced two groups, then two joint cells in respectively balanced each group group, and also the equilibrium between the joint of two in each group group cell can be carried out simultaneously.The time has been shortened in one-way fashion equilibrium, and two joint cells in only needing separately balanced group in the same time, the same time can be carried out two groups of equilibriums, has improved efficiency.In static process, above-mentioned balanced way almost can settle at one go; In each balanced subprogram, there is the instruction of controlling LED light on and off, so if LED light is lighted, show that equalizer just at work; On the contrary, if LED extinguishes, surperficial equalizer equalizes is complete, in lack of balance operating state.
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (9)
1. an electric car power supply balance control system, it is characterized in that: comprise controller (1), battery pack, cell voltage acquisition module (2), power module, between described controller (1) and battery pack, by balance module (3), be connected, the input of described controller (1) is connected with cell voltage acquisition module (2).
2. a kind of electric car power supply balance control system according to claim 1, is characterized in that: described balance module (3) comprises the switching network consisting of field-effect transistor, the capacitance network consisting of electric capacity.
3. a kind of electric car power supply balance control system according to claim 1 and 2, it is characterized in that: described controller, for respectively save the voltage signal of cell according to the battery pack of cell voltage acquisition module collection, by utilizing each batteries voltage of capacitor charge and discharge regulating cell group of capacitance network, make each batteries voltage swing consistent.
4. a kind of electric car power supply balance control system according to claim 1, is characterized in that: the output of described controller is connected with indicator light.
5. a kind of electric car power supply balance control system according to claim 1, is characterized in that: described controller adopts single-chip microcomputer, and its model is XC866.
6. a kind of electric car power supply balance control system according to claim 1, is characterized in that: described controller is connected with jtag interface.
7. a kind of electric car power supply balance control system according to claim 1, is characterized in that: described battery pack is four batteries.
8. a control method for electric car power supply balance control system according to claim 1, is characterized in that: described method comprises the following steps:
A) system is divided into Liang Ge group by battery pack, gather the voltage at the single battery two ends of each group, relatively the single battery voltage sum of the first group and the single battery voltage sum of the second group, shift electric weight until the voltage between two groups equates or is close to the low group of voltage from the high group of voltage;
B) voltage difference between each batteries in each group of systematic comparison, shifts electric weight until voltage between the two equates or is close to the low battery of voltage from the high single battery of voltage;
Step a), b) in electric energy transfer process in system light indicator light.
9. the control method of electric car power supply balance control system according to claim 7, is characterized in that: described method comprises following two stages:
First stage system is divided into Liang Ge group battery pack, the first single battery is 1# group with connecting of the second single battery, the 3rd single battery is 2# group with connecting of the 4th single battery, by data acquisition, can obtain the voltage at each single battery two ends, then compare the size of the first single-unit and the second single battery sum V1 and the 3rd single-unit and the 4th single battery sum V2, if V1>V2, the electric energy of 1# group is to the electric energy transfer of 2# group until the energy between two groups is equal; On the contrary, if V2>V1, the electric energy of 2# group is to the electric energy transfer of 1# group until the energy between two groups is equal;
Voltage difference in second stage systematic comparison 1# group between each batteries, electric weight is shifted until electric energy between the two equates to the low battery of electric energy from the high single battery of electric energy, voltage difference in systematic comparison 2# group between each batteries, shifts electric weight until electric energy between the two equates to the low battery of electric energy from the high single battery of electric energy.
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| CN101436774A (en) * | 2007-11-12 | 2009-05-20 | 深圳市比克电池有限公司 | Protective system for lithium ion battery |
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| CN102761166A (en) * | 2012-08-06 | 2012-10-31 | 哈尔滨工业大学 | Equalization circuit and equalization method of lithium ion battery pack |
| CN202565004U (en) * | 2012-06-05 | 2012-11-28 | 东北石油大学 | Vehicle-mounted power supply intelligent manager |
| CN103269108A (en) * | 2013-06-04 | 2013-08-28 | 奇瑞汽车股份有限公司 | Battery power equalization circuit |
-
2014
- 2014-06-19 CN CN201410277054.2A patent/CN104037881A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436774A (en) * | 2007-11-12 | 2009-05-20 | 深圳市比克电池有限公司 | Protective system for lithium ion battery |
| JP2010098866A (en) * | 2008-10-17 | 2010-04-30 | Panasonic Corp | Imbalance determination circuit, imbalance reduction circuit, battery power supply, and imbalance evaluation method |
| CN102255361A (en) * | 2011-07-19 | 2011-11-23 | 奇瑞汽车股份有限公司 | Method for equalizing electric quantity of batteries and equalizer |
| CN202565004U (en) * | 2012-06-05 | 2012-11-28 | 东北石油大学 | Vehicle-mounted power supply intelligent manager |
| CN102761166A (en) * | 2012-08-06 | 2012-10-31 | 哈尔滨工业大学 | Equalization circuit and equalization method of lithium ion battery pack |
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Application publication date: 20140910 |