CN105119022A - Lithium ion battery equalization control enablement method and quitting method for hybrid vehicle - Google Patents

Lithium ion battery equalization control enablement method and quitting method for hybrid vehicle Download PDF

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Publication number
CN105119022A
CN105119022A CN201510096727.9A CN201510096727A CN105119022A CN 105119022 A CN105119022 A CN 105119022A CN 201510096727 A CN201510096727 A CN 201510096727A CN 105119022 A CN105119022 A CN 105119022A
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China
Prior art keywords
battery
equilibrium
judge
equalization
condition meets
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Pending
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CN201510096727.9A
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Chinese (zh)
Inventor
丁灿
杨辉前
姚振辉
周安健
苏岭
邓柯军
郭晓甜
贺刚
刘波
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Chongqing Changan Automobile Co Ltd
Chongqing Changan New Energy Automobile Co Ltd
Original Assignee
Chongqing Changan Automobile Co Ltd
Chongqing Changan New Energy Automobile Co Ltd
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Application filed by Chongqing Changan Automobile Co Ltd, Chongqing Changan New Energy Automobile Co Ltd filed Critical Chongqing Changan Automobile Co Ltd
Priority to CN201510096727.9A priority Critical patent/CN105119022A/en
Publication of CN105119022A publication Critical patent/CN105119022A/en
Pending legal-status Critical Current

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention provides a lithium ion battery equalization control enablement method and a quitting method for hybrid vehicle, and the control enablement method is as follows: when the vehicle is in an idle state, parking time of the vehicle is determined; if the parking time exceeds a preset threshold, battery voltages of all monomers of a battery pack are collected; if the voltage difference exceeds a certain threshold and a present system does not have fault, an equalization is enabled to carry out for the battery monomer. In the equalization process, if the voltage difference is less than a certain threshold, or the vehicle has a power on request, or the equalization temperature is higher than a certain threshold, or an equalization time exceeds a certain threshold, the equalization function quits from the monomer battery which is carried out with the equalization. According to the invention, the equalization enablement method and the quitting method can be carried out for correct effective equalization start and close control in the prerequisite that the battery and the vehicle are safe, and reduce differences between battery monomers.

Description

A kind of enable method with exiting of Li-ion battery for HEV Balance route
Technical field
The present invention relates to hybrid vehicle lithium ion battery management system, particularly the battery balanced control method of one.
Background technology
For the battery pack comprising multiple batteries, during owing to using, the difference of battery temperature and cell degradation degree, causes the state of battery to be had nothing in common with each other.Along with the increase of discharge and recharge number of times, between battery, voltage difference is increasing, thus causes between battery unbalanced, shortens battery.
Existing balancing technique is " a kind of BMS balance control method " disclosed in Chinese patent literature CN103531857, it only illustrates and carries out the balanced consistency judgement of battery cell according to cell voltage difference, but the voltage of battery is divided into two kinds: operating voltage and open circuit voltage.Open circuit voltage is determined by the characteristic of battery, can reflect battery actual capacity.Operating voltage is the voltage sum that open circuit voltage and electric current produce in internal battery impedance.For hybrid vehicle, what show when driving is exactly operating voltage, is difficult to assess the Capacity uniformity of battery.
In view of above drawback, the invention provides a kind of battery balanced enable and method that is that exit and overcome the defect adopting operating voltage battery to be carried out to Balance route.
Summary of the invention
The present invention is directed to above problem and propose a kind of method that Li-ion battery for HEV Balance route is enable and exit.
The enable method with exiting of the Li-ion battery for HEV Balance route that the present invention proposes, by controlling unlatching or the closedown of battery cell equalizing circuit, thus reaches the good object of battery cell consistency.
The enable method with exiting of equilibrium of the present invention, comprise balanced enable condition and the balanced condition exited, described method step is as follows:
Judge that whether battery is at idle phase, if at idle phase, namely car load does not use battery, then arrange alarm clock startup timer and start timing, battery management system enters park mode, and continues step below, otherwise does not open equilibrium;
Judge whether the battery standing time exceedes certain threshold value, if condition meets, namely alarm time is to waking battery management system up, continues step below, otherwise does not open equilibrium;
Judge whether present battery management system does not have fault, if condition meets continuation step below, otherwise do not open equilibrium;
Judge between monomer, whether pressure reduction exceedes certain threshold value, if condition meets open equilibrium, otherwise do not open equilibrium;
In balanced opening process, judge between monomer, whether pressure reduction is less than certain threshold value, if fruit condition meets just exit equilibrium, otherwise continue step below;
Judge whether car load powers on request, namely battery is in electric discharge or charged state, if condition meets just exit equilibrium, otherwise continues step below;
Judge in battery balanced process, whether balancing chip temperature is greater than certain threshold value, if condition meets just exit equilibrium, otherwise continue step below.
Judge whether time for balance exceedes certain value, if condition meets just exit equilibrium, otherwise do not exit equilibrium.
By adopting the enable and method that exits of equilibrium of the present invention, under the prerequisite of cell safety and car load safety, correct effective balanced opening and closing can be carried out and control, reduce the difference between battery cell.
Compared with prior art, the invention has the advantages that:
1, the present invention can carry out correct Balance route according to the virtual condition of battery, avoids and carries out according to operating voltage the problem that Balance route can not reflect actual battery capacity;
2, the present invention is under the trouble-free prerequisite of battery, carries out equilibrium and opens and closes;
3, the open circuit voltage that the present invention's battery idle phase collects carries out harmony and judges;
4, the present invention can ensure that chip operation carries out equalization operation in normal temperature range;
5, the present invention's method of adopting time for balance to calculate, can ensure 12V storage battery can not because time for balance is long power shortage.
Accompanying drawing explanation
Figure 1 shows that the balanced enabled method of hybrid vehicle lithium ion battery of the present invention;
Figure 2 shows that method is exited in hybrid vehicle lithium ion battery of the present invention equilibrium.
Embodiment
In order to better the present invention is described, being convenient to the understanding of those skilled in the art, below in conjunction with the drawings and specific embodiments, describing implementation process of the present invention.
The enable determination methods flow chart of equilibrium according to an embodiment of the invention shown in Fig. 1.
In one embodiment, battery pack, containing first monomer with the first voltage, comprises the second comonomer with the second voltage, and the voltage of voltage ratio first monomer of second comonomer is high.When car load is in idle condition, judge the parking time of car load, when the parking time exceedes predetermined threshold value, gather the cell voltage of all monomers of power brick, when voltage difference when between second comonomer and the first monomer exceedes certain threshold value and current system does not have fault, to the enable equilibrium of second comonomer.
In a step 102, judge whether battery is in idle phase.In one embodiment, judge the whether lower electricity of car load, start timing when arranging alarm clock and start timer during electricity under car load, battery management system enters park mode, and flow process forwards step 104 to; If the not lower electricity of car load, then do not carry out follow-up judgement, flow process rests on step 102, continues to judge whether battery is in idle phase.
At step 104, judge whether the battery standing time exceedes predetermined threshold value.In one embodiment, whether determining step 102 Timer reaches predetermined threshold value, if the satisfied battery management system that just wakes up of condition carries out harmony judgement, flow process forwards step 106 to; Otherwise, otherwise do not carry out follow-up judgement, flow process rests on step 104, continues to judge whether the battery standing time exceedes predetermined threshold value.
In step 106, judge whether battery management system does not have fault.In one embodiment, judge that battery management system does not currently have the too high fault of battery temperature, battery cell is under-voltage fault, the too low fault of SOC etc.If do not have fault, flow process forwards step 108 to, carries out battery balanced consistency judgement; Otherwise, do not open equalization function.
In step 108, judge between monomer, whether pressure reduction exceedes certain threshold value.In one embodiment, the monomer voltage collected is the open circuit voltage of battery, and the open circuit voltage collected after certain time of repose truly can reflect the virtual condition that battery is current.Suppose actual acquisition to monomer voltage in the open circuit voltage of the first monomer minimum, for Vcell_min, the open circuit voltage of second comonomer is the highest, for Vcell_max, and the pressure difference between Vcell_min and Vcell_max is greater than predetermined threshold value, flow process forwards step 110 to, opens balanced to second comonomer; Otherwise, do not open equalization function.
In step 110, high to voltage monomer is opened balanced.In one embodiment, open-circuit voltage is the second comonomer unlatching equilibrium of Vcell_max.
Determination methods flow chart is exited in equilibrium according to an embodiment of the invention shown in Fig. 2.
In one embodiment, battery pack is containing first monomer with the first voltage, and comprise the second comonomer with the second voltage, second comonomer opens equilibrium.Pressure reduction when between second comonomer and the first monomer is less than certain threshold value, or the car load request of powering on, or equalization temperature is greater than certain threshold value, or when time for balance exceedes certain threshold value, exits equalization function to opening balanced second comonomer.
In step 202., judge between monomer, whether pressure reduction is less than certain threshold value.In one embodiment, judge whether the voltage difference of second comonomer and the first monomer is less than predetermined threshold value.When the conditions are met, flow process transfers to step 210, exits equilibrium to second comonomer; Otherwise flow process forwards in step 204 and continues to judge.
In step 204, judge whether car load powers on request.In one embodiment, after car load powers on, the voltage collected is operating voltage, can not reflect the time of day of battery, the request of powering on of main car load, and just exit equalization function, flow process transfers to step 210; Otherwise flow process forwards in step 206 and continues to judge.
In step 206, judge whether equalization temperature exceedes certain threshold value.In one embodiment, after balanced unlatching, equalizing circuit accessory temperature can rise, and in order to ensure that circuit works in the temperature range allowed, once equalization temperature exceedes predetermined threshold value, just exit equilibrium, flow process forwards step 210 to; Otherwise flow process forwards in step 208 and continues to judge.
In a step 208, judge whether time for balance exceedes certain threshold value.In one embodiment, during balanced unlatching, need to provide external power source to battery management system.In order to ensure that 12V storage battery is can in the scope of application, time for balance is unsuitable long.When time for balance exceedes predetermined threshold value, just exit equilibrium, flow process forwards step 210 to; Otherwise flow process forwards step 202 to, carry out the judgement of next round, circulate with this.
In step 210, equilibrium is exited to opening balanced monomer.In one embodiment, equilibrium is exited to the second comonomer opened.
Disclosed by the invention based on the balanced enable method with exiting of hybrid vehicle lithium ion battery, be applicable to the equilibrium of hybrid vehicle lithium ion battery, be intended to the time of day according to battery, carry out battery with two side terminals judgement, cell safety can prerequisite under, to the enable equilibrium of battery; Coherence request is met at battery, or when can not obtain battery time of day, or equalization temperature is too high, or when time for balance is oversize, exit battery balanced.
It should be noted that any apparent replacement is all within protection scope of the present invention under the prerequisite not departing from the present invention's design.

Claims (2)

1. the enable method with exiting of Li-ion battery for HEV Balance route, described method step is as follows:
(1) judge that whether battery is at idle phase, if at idle phase, namely car load does not use battery, then arrange alarm clock startup timer and start timing, battery management system enters park mode, and continues step below, otherwise does not open equilibrium;
(2) judge whether the battery standing time exceedes threshold value, if condition meets, namely alarm time arrives, and wakes battery management system up, continues step below, otherwise does not open equilibrium;
(3) judge whether present battery management system does not have fault, if condition meets continuation step below, otherwise do not open equilibrium;
(4) judge between monomer, whether pressure reduction exceedes threshold value, if condition meets open equilibrium, otherwise do not open equilibrium;
(5) in balanced opening process, judge between monomer, whether pressure reduction is less than threshold value, if fruit condition meets just exit equilibrium, otherwise continue step below;
(6) judge whether car load powers on request, namely battery is in electric discharge or charged state, if condition meets just exit equilibrium, otherwise continues step below;
(7) judge in battery balanced process, whether balancing chip temperature is greater than threshold value, if condition meets just exit equilibrium, otherwise continue step below;
(8) judge whether time for balance exceedes certain value, if condition meets just exit equilibrium, otherwise do not exit equilibrium.
2. the enable and method that exits of Li-ion battery for HEV Balance route according to claim 1, is characterized in that: described judge whether present battery management system does not have fault to refer to judge battery management system currently whether to have the too high fault of battery temperature, battery cell is under-voltage fault, the too low fault of SOC.
CN201510096727.9A 2015-03-04 2015-03-04 Lithium ion battery equalization control enablement method and quitting method for hybrid vehicle Pending CN105119022A (en)

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Cited By (8)

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CN107415756A (en) * 2017-08-25 2017-12-01 北京智行鸿远汽车有限公司 A kind of cell management system of electric automobile equalization methods based on passive balanced way
CN107492688A (en) * 2017-07-05 2017-12-19 宝沃汽车(中国)有限公司 A kind of battery maintenance method, apparatus and vehicle
CN107749500A (en) * 2017-10-13 2018-03-02 合肥澎湃能源技术有限公司 For battery balanced method and device
CN109823232A (en) * 2019-01-29 2019-05-31 北京长城华冠汽车科技股份有限公司 Battery balanced control method, device, battery management system and vehicle
CN110525270A (en) * 2019-08-02 2019-12-03 昆山宝创新能源科技有限公司 Battery pack equilibrium method, system and vehicle
CN110682831A (en) * 2018-06-19 2020-01-14 广州汽车集团股份有限公司 Vehicle-mounted power battery equalization method and device and automobile
CN110729797A (en) * 2019-11-13 2020-01-24 昆山宝创新能源科技有限公司 Vehicle and battery pack balance control method, device and system thereof
CN111196178A (en) * 2018-11-16 2020-05-26 宁德时代新能源科技股份有限公司 Conversion circuit, battery equalization system and battery management system

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CN110682831A (en) * 2018-06-19 2020-01-14 广州汽车集团股份有限公司 Vehicle-mounted power battery equalization method and device and automobile
CN110682831B (en) * 2018-06-19 2021-05-14 广州汽车集团股份有限公司 Vehicle-mounted power battery equalization method and device and automobile
CN111196178A (en) * 2018-11-16 2020-05-26 宁德时代新能源科技股份有限公司 Conversion circuit, battery equalization system and battery management system
CN109823232A (en) * 2019-01-29 2019-05-31 北京长城华冠汽车科技股份有限公司 Battery balanced control method, device, battery management system and vehicle
CN110525270A (en) * 2019-08-02 2019-12-03 昆山宝创新能源科技有限公司 Battery pack equilibrium method, system and vehicle
CN110729797A (en) * 2019-11-13 2020-01-24 昆山宝创新能源科技有限公司 Vehicle and battery pack balance control method, device and system thereof

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