CN205453179U

CN205453179U - Electric vehicle battery organizes charging device with equilibrium and protect function charge

Info

Publication number: CN205453179U
Application number: CN201521110675.8U
Authority: CN
Inventors: 黄涛; 刘鹏
Original assignee: Wuhan Huayuan Jiji Electric Power Equipment Engineering Co Ltd
Current assignee: Wuhan Huayuan Jiji Electric Power Equipment Engineering Co Ltd
Priority date: 2015-12-28
Filing date: 2015-12-28
Publication date: 2016-08-10
Anticipated expiration: 2025-12-28

Abstract

The utility model provides an electric vehicle battery organizes charging device with equilibrium and protect function charge, including rectification power supply, pulse width modulation circuit, contravariant transformer and pulse current charge return circuit, its contravariant transformer pair sideline circle number is the same with the battery cell number of group battery, and every contravariant transformer is paid the sideline and is enclosed through battery cell of a power switch element connection, and every battery cell connects the controlling protector that charges, the controlling protector's that charges output connection power switch element's control electrode, the controlling protector that charges includes two limit comparators and a R -S trigger, the control end uin of two limit comparators connects battery cell's positive pole, the first c that relatively holds of two limit comparators connects V0, the explanation battery was out of order when V0 battery cell's voltage was less than V0, the second of two limit comparators relatively holds d to connect V1, V1 is battery cell's the upper limit value that charges, the output U0 of two limit comparators connects an input of R -S trigger, power switch element's control electrode is connected to the output that the R -S trigger corresponds.

Description

There is the accumulator of electric car group charging device of charge balancing and defencive function

Technical field

This utility model relates to a kind of accumulator of electric car group charging device with charge balancing and defencive function, is the device that charged by series storage battery process is equalized and protected.Belong to accumulator of electric car group charging technique field.

Background technology

Development along with new-energy automobile particularly electric automobile, accumulator charging technology requires more and more higher, series-connected batteries is made up of plural cell, charger typically uses single power supply to be charged whole Battery pack, and the total voltage that basis for estimation is whole group storage battery that charging terminates reaches predetermined value.Owing to the capacity of each monomer is inconsistent, before overall charging voltage reaches predetermined value, after some batteries are full of in advance, still have charging current to flow through, thus overcharge phenomenon, it is irremediable for overcharging the harm causing accumulator, affects its performance and used life.After overall charging voltage reaches predetermined value, owing to partial monosomy over-charging of battery causes voltage to raise, so that the big battery charging voltage of capacity is relatively low, although overall charging terminates but the still underfill of partial monosomy battery, the situation of cell charge less also can affect the performance of set of cells.So during charged by series storage battery, suitable device is needed to make all cells reach appropriate charged state, so that the serviceability of whole Battery pack is optimized.

Existing a kind of equalizaing charge technology, when main charger charges to whole Battery pack, a controlled energy-bypass system bleeder in parallel on each cell, after arbitrary cell reaches predetermined voltage, unnecessary charging current is bypassed device and releases, the energy released is converted to heat and is dispersed in external environment condition, ensures that the voltage of cell is less than set point, so that each cell reaches good charged state to a certain extent.This technology is very poor in terms of capacity usage ratio, when cell quantity is more, when battery capacity is bigger, overall caloric value is a considerable numerical value, owing to being limited by radiating condition, it is too big that the thermal power of resistance energy-dissipating device can not be done, and the capacity of by-pass shunt is relatively small, is not suitable for jumbo set of cells.

Summary of the invention

The purpose of this utility model is to provide a kind of accumulator of electric car group charging device with charge balancing and defencive function, reaches preferable portfolio effect, and can effectively protect each accumulator not overcharge.

The technical solution of the utility model is achieved in that this utility model has the accumulator of electric car group charging device of charge balancing and defencive function and includes rectifier power source, pulse-width modulation circuit, contravariant transformer and pulse charge loop; its contravariant transformer secondary side coil number is identical with the cell number of set of cells; each contravariant transformer secondary side coil connects a cell by a power switch component; each cell connects a charging and controls protector, and the output of charging control protector connects the control pole of power switch component；Charging controls protector and includes a double-limit comparator and a R-S trigger; the control end Uin of double-limit comparator connects the positive pole of cell; the first of double-limit comparator is compared end c and connects V0; the voltage of V0 cell is the most faulty less than explanation accumulator during V0; the second of double-limit comparator is compared end d and connects V1; V1 is the charging upper limit value of cell; the outfan U0 of double-limit comparator connects an input of R-S trigger, and the outfan that R-S trigger is corresponding connects the control pole of power switch component.

The beneficial effects of the utility model: this utility model is that the charging that each cell is separately configured controls protector, reaches preferable portfolio effect.This circuit structure is relatively easy, has higher energy conversion transmission efficiency, less space requirement, reduces energy loss, simultaneously because reduce heating.This device can improve power density and process capacity, can be with the set of cells of online treatment more capacity, when monomer capacity difference each in whole Battery pack is bigger, this device can not only play equilibrium function effectively, and the convenience that client charges night can be met with charging pile, not worrying overcharging, overcharging of the most individual accumulator body, it is irremediable for overcharging the harm causing accumulator.This utility model can be with the set of cells of online treatment more capacity, and when monomer capacity difference each in whole Battery pack is bigger, this device can accomplish that each cell batteries is full of i.e. power-off effectively, better adapts to each opposite sex of cell batteries.During for there being the voltage of cell batteries to be less than V0 in set of cells, illustrating that accumulator is the most faulty, it is impossible to during charging, this device because continuing charging, and will not cause the serious consequences such as battery explosion.Development for current power automobile of the present utility model is significant.

Accompanying drawing explanation

Fig. 1 is electricity theory diagram of the present utility model.

Fig. 2 is that charging of the present utility model controls protector electrical schematic diagram.

Detailed description of the invention

Fig. 1 is electricity theory diagram of the present utility model: this utility model includes rectifier power source M1, pulse-width modulation circuit includes PWM electric current and high frequency power element Q, high frequency power element Q is connected to the former limit of contravariant transformer T, pulse charge loop includes that contravariant transformer T pays n, limit coil T1, T2 ... Tn, n is the number of the cell B of set of cells: B1, B2 ... Bn, each contravariant transformer secondary side coil passes through power switch component a: Q1, Q2, ... Qn connects cell a: B1, B2 ... Bn, each cell connects a charging and controls protector (1, 2 ... n), each charging controls the control pole of the power switch component of the output connection correspondence of protector.

Fig. 2 is that charging of the present utility model controls protector electrical schematic diagram: charging controls protector and includes a double-limit comparator N and a R-S trigger, the control end Uin of double-limit comparator N connects the positive pole of cell, the first of double-limit comparator N is compared end c and connects V0, the determination of V0 value is: the voltage of cell is the most faulty less than explanation accumulator during V0, can not charge, the second of double-limit comparator is compared end d and connects V1, V1 is the charging upper limit value of cell, the outfan U0 of double-limit comparator connects an input of R-S trigger, the outfan that R-S trigger is corresponding connects the control pole of power switch component.

After charging device connects electricity, by rectifier power source M1 rectification, controlled contravariant transformer T primary coil waveform by pulse-width modulation circuit, its objective is, according to the quick charge requirement to pulse, to solve to adjust the problem such as output pulse frequency, output voltage through a contravariant transformer.Each contravariant transformer secondary side coil passes through a power switch component as switch as cell charging output, each contravariant transformer secondary side coil.As cell V0 < Uin, < during V1, the outfan U0 of double-limit comparator is high potential, R-S flip-flop toggle, triggers power switch component conducting, and contravariant transformer is paid limit and charged battery；When cell Uin is not at threshold range, i.e. when cell Uin is more than higher limit V1 or is less than V0, the outfan U0 of double-limit comparator is 0, and R-S trigger makes power switch component cut out, and contravariant transformer pays limit to battery runs down.

When this utility model uses, main body charger still uses traditional method, and a Battery pack is equipped with a charger, and the positive and negative terminal of this charger is connected to the positive and negative terminal of set of cells.The device that charging equalization apparatus for series storage battery of the present utility model is to increase, is each cell parallel connection and is equipped with an energy conversion device, will be in charging process, when arbitrary cell short of electricity, this battery can charge, after arbitrary cell is full of, and can individually power-off.It also avoid such situation: when set of cells is charged by conventional charging device, partial monosomy is full of in advance simultaneously, and respective end voltage raises, and makes total charging voltage raise, and after total voltage reaches the ceiling voltage set, still has partial monosomy to be not up to full of voltage.

Present arrangement avoids the loaded down with trivial details of operating process; this device circuit structure is relatively easy; there is higher energy conversion transmission efficiency; less space requirement, reduces energy loss, simultaneously because reduce heating; this device can improve power density and process capacity; can be with the set of cells of online treatment more capacity, when monomer capacity difference each in whole Battery pack is bigger, this device remains to effectively play charge balancing and defencive function.

Claims

1. an accumulator of electric car group charging device with charge balancing and defencive function; including rectifier power source, pulse-width modulation circuit, contravariant transformer and pulse charge loop; it is characterized in that: contravariant transformer secondary side coil number is identical with the cell number of set of cells; each contravariant transformer secondary side coil connects a cell by a power switch component; each cell connects a charging and controls protector, and the output of charging control protector connects the control pole of power switch component；Charging controls protector and includes a double-limit comparator and a R-S trigger; the control end Uin of double-limit comparator connects the positive pole of cell; the first of double-limit comparator is compared end c and connects V0; the voltage of V0 cell is the most faulty less than explanation accumulator during V0; the second of double-limit comparator is compared end d and connects V1; V1 is the charging upper limit value of cell; the outfan U0 of double-limit comparator connects an input of R-S trigger, and the outfan that R-S trigger is corresponding connects the control pole of power switch component.