CN102684260A - Active equalization method and device for electric vehicle battery - Google Patents
Active equalization method and device for electric vehicle battery Download PDFInfo
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- CN102684260A CN102684260A CN2012101398093A CN201210139809A CN102684260A CN 102684260 A CN102684260 A CN 102684260A CN 2012101398093 A CN2012101398093 A CN 2012101398093A CN 201210139809 A CN201210139809 A CN 201210139809A CN 102684260 A CN102684260 A CN 102684260A
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Abstract
The invention relates to an active equalization method for an electric vehicle battery and simultaneously provides an equalization device for realizing the equalization method. An electric vehicle battery pack is formed by connecting N+1 batteries in series; positive voltage of a superior battery in the electric vehicle battery pack is used for charging a charge capacitor through a negative-voltage charge pump chip, and the superior battery and the charge capacitor are disconnected after charging is completed; and then, after the charge capacitor is subjected to polarity inversion, a filter capacitor is used for filtering treatment so as to charge an inferior battery in the electric vehicle battery pack, so that the electric quantity of the battery with higher electric quantity is converted to the battery with lower electric quantity, and the active equalization of voltage among the batteries in the electric vehicle battery pack is completed. According to the invention, a switch matrix is prevented from being used, so that short circuit of a veneer caused by misoperation is prevented; a transformer for isolation is not needed, so that the cost and the area of the veneer are reduced; and the active equalization manner of the batteries is favorable for reducing unnecessary conversion from energy sources into heat energy to be consumed, for a vehicle.
Description
Technical field
The present invention relates to initiatively equalization methods of a kind of batteries of electric automobile; The balancer of realizing this method also is provided simultaneously; This method is used negative voltage charge pump chip, realizes the active balancing technique of battery belonging to the batteries of electric automobile technical field through the charge pump mode.
Background technology
At present electric automobile battery balanced has two kinds of methods: passive equilibrium is balanced with initiatively.Passive equilibrium mainly relies on power resistor with the form that converts heat into the overtension battery to be discharged.Existing initiatively balanced method has: 1. rely on transformer the energy of overtension battery dress change to a big electric capacity or independently battery transmit back through certain mode again as the energy transfer; 2. through the form of switch matrix, be transformed into the lower battery of voltage to the overtension energy content of battery.Existing technological subject matter: passive equilibrium is carried out equilibrium with the mode of consumed power, and the one, waste energy, the 2nd, producing great amount of heat needs to discharge; Rely on the balanced cost of active and the space of transformer all very high, integrated level is low-cost high.Rely on a large amount of switch of active equilibrium needs of switch matrix, and be short-circuited easily during the software control mistake.
Summary of the invention
The invention discloses initiatively equalization methods of a kind of batteries of electric automobile, solved the initiatively shortcoming of equalization methods such as present dependence transformer or switch matrix.
The present invention also provides the balancer of realizing above-mentioned equalization methods, is used for the battery balanced of electric automobile.
Batteries of electric automobile of the present invention is equalization methods initiatively, and its technical solution is following:
The batteries of electric automobile bag is made up of N+1 battery series connection; Utilize the positive voltage of the higher level's battery in the batteries of electric automobile bag to charge through the negative voltage charge pump chip, after charging finishes both are broken off for charging capacitor; Then; With passing through the filter capacitor Filtering Processing after the charging capacitor polarity inversion; Be the subordinate's battery charge in the batteries of electric automobile bag, realize that the too high battery electric quantity of electric weight is transformed in the lower battery of electric weight, accomplish initiatively equilibrium of voltage between the battery in the batteries of electric automobile bag.
Batteries of electric automobile according to the invention is the device of equalization methods initiatively, it is characterized in that:
1) the batteries of electric automobile bag is made up of N+1 battery series connection;
2) positive pole of each battery is connected the negative pole of each battery and ground connection through switch triode with the power input of negative voltage charge pump chip; The electric capacity input of negative voltage charge pump chip is connected with charging capacitor, is the charging capacitor charging with the positive voltage of higher level's battery; The output of negative voltage charge pump chip is connected with filter capacitor, with passing through the filter capacitor Filtering Processing after the charging capacitor polarity inversion, is subordinate's battery charge.
3) the afterbody battery in the batteries of electric automobile bag is connected with the power input of isolated form DCDC power module through switch triode; The output cathode of isolated form DCDC power module inserts the positive pole of higher level's battery through diode and current-limiting resistance, and negative pole inserts the negative pole of higher level's battery; The control end of control module is connected the operating state of control switch triode with the switch control end of switch triode.
The maximum output current of the negative voltage charge pump chip that the present invention relates to is negative 200 milliamperes, and internal operating frequencies is 1MHz, and maximum working voltage is 5.5V.
Among the present invention; Form charging circuit by negative voltage charge pump chip and charging and filter capacitor device; Can the positive voltage of a battery be converted into the negative voltage of same absolute; Give next adjacent Battery pack charging of this battery with the negative voltage of this output,, so just can the power conversion of the battery of overtension be arrived the lower battery of voltage then this part hardware circuit serial cascade in all batteries.
The invention has the beneficial effects as follows: utilize the negative voltage charge pump chip can positive voltage be converted to the characteristic of negative voltage, at each this chip of battery use of batteries of electric automobile bag, the battery of previous stage overtension is the battery charge of next stage brownout; Avoid the use of switch matrix, thereby prevent that misoperation from causing the veneer short circuit; Do not need transformer isolation yet, reduced veneer cost and area; The present invention is an initiatively balanced way of battery, and the unnecessary energy of reduction automobile transfers thermal energy consumption to and falls.
Description of drawings
Fig. 1 is an initiatively equalizing circuit theory diagram of the present invention.
Embodiment
Embodiment 1
Shown in accompanying drawing 1, apparatus of the present invention comprise that ((U1 ~ Un) adopts the MAX889 chip, switch triode of U.S. letter company, and ((R0 ~ Rn), charging capacitor (C1 ~ Cn), filter capacitor (C ' 1 ~ C ' n), isolated form DCDC module P, diode D form N+1 battery, control module CM (LTC6802-2) for Q0 ~ Qn), current-limiting charge resistance for E0 ~ En), negative voltage charge pump chip;
At first; (E0 ~ En) series connection constitutes the batteries of electric automobile bag with N+1 battery; ((power input of U1 ~ Un) is connected, and (GND of U1 ~ Un) links to each other for the negative pole of each battery and negative voltage charge pump chip for Q1 ~ Qn) and negative voltage charge pump chip through switch triode for the positive pole of each battery; ((C1 ~ Cn) be connected is charging capacitor (C1 ~ Cn) charging with the positive voltage of higher level's battery to the negative voltage charge pump chip for the electric capacity input of U1 ~ Un) and charging capacitor; The output of negative voltage charge pump chip and filter capacitor (C ' 1 ~ C ' n) are connected, with after the charging capacitor polarity inversion through filter capacitor (C ' 1 ~ C ' n) Filtering Processing, be subordinate's battery charge.
The battery E0 of afterbody is connected with the power input of isolated form DCDC power module P through switch triode Q0; The output cathode of isolated form DCDC power module P inserts the positive pole of higher level's battery En through diode D and current-limiting resistance R0, and negative pole inserts the negative pole of higher level's battery En;
The control end of control module CM (CTRL0 ~ CTRLn) and switch triode (Q0 ~ Qn) the switch control end is connected, the control switch triode (operating state of Q0 ~ Qn).
The course of work: maximum 200 milliamperes current balance is provided by the negative voltage charge pump chip between each battery, can converts positive voltage to negative voltage, convert its discharge to negative voltage for the too high battery of charging and give adjacent subordinate's battery charge; If subordinate's cell voltage is also too high, then continue charging, by that analogy toward subordinate.
For example: the overtension of battery E2; Battery E1 brownout; Control module CM control CTRL2 unblanking switch triode Q2; Start negative voltage charge pump chip U2 work, the electric capacity input of negative voltage charge pump chip U2 is connected with charging capacitor C2, is that charging capacitor C2 charges with the positive voltage of battery E2; The output of negative voltage charge pump chip U2 is connected with filter capacitor C ' 2; With passing through filter capacitor C ' 2 Filtering Processing after the charging capacitor C2 polarity inversion; Be connected to the negative pole of battery E1 through current-limiting resistance R2, give battery E1 charging, thereby reach the balance of voltage of battery E2 and battery E1.Battery E1 adopts above-mentioned balanced way to the equilibrium between the battery En.
When the overtension of battery E0; Control module CM control CTRL0 opens switch triode Q0; Start isolated form DCDC power module P work; The power supply output cathode of isolated form DCDC power module P is connected to the positive pole of battery En through diode D and current-limiting resistance R0, and the power supply output negative pole of isolated form DCDC power module P connects the negative pole of battery En, realizes that battery E0 gives battery En charging.
Between battery balanced energy position be from battery En to battery E0, battery E0 passes to battery En through isolated form DCDC power module P then.When the battery of the battery of overtension and brownout was non-conterminous, high like battery E3 voltage, battery E1 voltage was low, and control module CM control battery E3 give battery E2 charging, controls battery E2 again and charge to E1.
Claims (2)
1. batteries of electric automobile equalization methods initiatively is characterized in that:
The batteries of electric automobile bag is made up of N+1 battery series connection; Utilize the positive voltage of the higher level's battery in the batteries of electric automobile bag to charge through the negative voltage charge pump chip, after charging finishes both are broken off for charging capacitor; Then; With passing through the filter capacitor Filtering Processing after the charging capacitor polarity inversion; Be the subordinate's battery charge in the batteries of electric automobile bag, realize that the too high battery electric quantity of electric weight is transformed in the lower battery of electric weight, accomplish initiatively equilibrium of voltage between the battery in the batteries of electric automobile bag.
2. be used for initiatively balancer of batteries of electric automobile, it is characterized in that:
1) the batteries of electric automobile bag is made up of N+1 battery series connection;
2) positive pole of each battery is connected the negative pole of each battery and ground connection through switch triode with the power input of negative voltage charge pump chip; The electric capacity input of negative voltage charge pump chip is connected with charging capacitor, is the charging capacitor charging with the positive voltage of higher level's battery; The output of negative voltage charge pump chip is connected with filter capacitor, with passing through the filter capacitor Filtering Processing after the charging capacitor polarity inversion, is subordinate's battery charge;
3) the afterbody battery in the batteries of electric automobile bag is connected with the power input of isolated form DCDC power module through switch triode; The output cathode of isolated form DCDC power module inserts the positive pole of higher level's battery through diode and current-limiting resistance, and negative pole inserts the negative pole of higher level's battery; The control end of control module is connected the operating state of control switch triode with the switch control end of switch triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101398093A CN102684260A (en) | 2012-05-08 | 2012-05-08 | Active equalization method and device for electric vehicle battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101398093A CN102684260A (en) | 2012-05-08 | 2012-05-08 | Active equalization method and device for electric vehicle battery |
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| CN102684260A true CN102684260A (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012101398093A Pending CN102684260A (en) | 2012-05-08 | 2012-05-08 | Active equalization method and device for electric vehicle battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103516030A (en) * | 2013-10-21 | 2014-01-15 | 南车株洲电力机车有限公司 | Voltage equalizing device and method |
| CN105048789A (en) * | 2015-08-20 | 2015-11-11 | 上海三环节能科技发展有限公司 | Voltage-sharing DC capacitor system for large-power frequency converter |
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| US7612530B2 (en) * | 2006-11-21 | 2009-11-03 | Industrial Technology Research Institute | Bridge battery voltage equalizer |
| CN101682199A (en) * | 2007-05-11 | 2010-03-24 | 诺基亚公司 | Power distribution circuit for use in a portable telecommunications device |
| CN102074991A (en) * | 2011-01-24 | 2011-05-25 | 启明信息技术股份有限公司 | Method and device for full balance control of power battery of electric automobile |
| CN102403893A (en) * | 2010-09-10 | 2012-04-04 | 王星光 | High-power high-efficiency charge pump circuit |
| CN202678996U (en) * | 2012-05-08 | 2013-01-16 | 中国第一汽车股份有限公司 | Balancing device for electric vehicle battery |
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2012
- 2012-05-08 CN CN2012101398093A patent/CN102684260A/en active Pending
Patent Citations (5)
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| US7612530B2 (en) * | 2006-11-21 | 2009-11-03 | Industrial Technology Research Institute | Bridge battery voltage equalizer |
| CN101682199A (en) * | 2007-05-11 | 2010-03-24 | 诺基亚公司 | Power distribution circuit for use in a portable telecommunications device |
| CN102403893A (en) * | 2010-09-10 | 2012-04-04 | 王星光 | High-power high-efficiency charge pump circuit |
| CN102074991A (en) * | 2011-01-24 | 2011-05-25 | 启明信息技术股份有限公司 | Method and device for full balance control of power battery of electric automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516030A (en) * | 2013-10-21 | 2014-01-15 | 南车株洲电力机车有限公司 | Voltage equalizing device and method |
| CN105048789A (en) * | 2015-08-20 | 2015-11-11 | 上海三环节能科技发展有限公司 | Voltage-sharing DC capacitor system for large-power frequency converter |
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Application publication date: 20120919 |