CN103647332B - For the conforming passive balance control system of battery maintenance group and control method - Google Patents

For the conforming passive balance control system of battery maintenance group and control method Download PDF

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Publication number
CN103647332B
CN103647332B CN201310729959.4A CN201310729959A CN103647332B CN 103647332 B CN103647332 B CN 103647332B CN 201310729959 A CN201310729959 A CN 201310729959A CN 103647332 B CN103647332 B CN 103647332B
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China
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battery
capacity
battery cell
control
battery pack
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CN201310729959.4A
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Chinese (zh)
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CN103647332A (en
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叶磊
宋苏
刘永星
那伟
蒋新华
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上海航天电源技术有限责任公司
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Abstract

The open one of the present invention is used for the conforming passive balance control system of battery maintenance group, and this system comprises: battery management system, and its circuit connects the capacity of each battery cell in battery pack Real-Time Monitoring battery pack, and has judged whether obvious capacity volume variance; Some equalizing resistances, it is connected in parallel with each battery cell in described battery pack respectively; Each equalizing resistance is in series with the equalizer switch often opened; Battery management system connects each equalizer switch respectively, controls the opening and closing of equalizer switch, when a certain battery cell capacity and other battery cell capacity difference are excessive, then closes its equalizer switch connected, consumes this battery cell electricity.The present invention is by detecting battery in battery pack monomer voltage, judge whether that capacity and other battery cell capacity difference of battery cell are excessive, to consume the electricity of the excessive battery cell of this capacity, realize passive Balance route, battery maintenance group system consistency.

Description

For the conforming passive balance control system of battery maintenance group and control method
Technical field
The present invention relates to lithium battery and the system manufacturing technology in vehicle-mounted and energy storage field, be specifically related to a kind of for the conforming passive balance control system of battery maintenance group and control method.
Background technology
Dynamic lithium battery group system is just progressively applied in the field such as electric automobile, large-scale energy-storage system.But battery in the life-span later in groups but well below the life-span of cell, mainly due to the difference of cell manufacturing process, self discharge difference, density of electrolyte and in groups after the difference such as the temperature of battery and ventilation condition, make the discharge and recharge of lithium battery group uneven.This further causes partial monosomy battery damage, enters vicious circle.Therefore balancing technique in the practical application of lithium battery group for improve battery capacity, extend battery life serve key effect.
Summary of the invention
The invention provides a kind of for the conforming passive balance control system of battery maintenance group and control method, in lithium battery group charging process, monomer battery voltage detected thus assess each cell capacity difference in battery pack, adopt the passive balanced way electric quantity of single batteries that contents of decrement is higher effectively of resistance power consumption, battery maintenance group system consistency.
For achieving the above object, the invention provides a kind of for the conforming passive balance control system of battery maintenance group, be characterized in, this system comprises:
Battery management system, its circuit connects the capacity of each battery cell in battery pack Real-Time Monitoring battery pack, and has judged whether obvious capacity volume variance;
Some equalizing resistances, it is connected in parallel with each battery cell in described battery pack respectively; Each equalizing resistance is in series with the equalizer switch often opened;
Described battery management system connects each equalizer switch respectively, controls the opening and closing of equalizer switch, when a certain battery cell capacity and other battery cell capacity difference are excessive, then closes its equalizer switch connected, consumes this battery cell electricity.
Above-mentioned battery management system also circuit is connected with hygrosensor, detects the temperature of each balancing battery respectively, and when equalizing resistance carries out Balance route, temperature is too high, then disconnect this equalizing resistance.
In above-mentioned battery pack, each battery cell is connected in series.
The above-mentioned control method for the conforming passive balance control system of battery maintenance group, be characterized in, the method includes the steps of:
When step 1, battery pack are charged, battery management system detects the magnitude of voltage of all battery cells in battery pack in real time;
It is too high compared with other battery cell capacity that step 2, battery management system judge whether there is the capacity of battery cell in battery pack, if so, then jumps to step 3, if not, then jump to step 1;
Step 3, battery management system control equalizer switch corresponding to the too high battery cell of this capacity and close;
The electricity of the battery cell that step 4, equalizing resistance contents of decrement are too high, makes the capacity of this battery cell and other battery cells reach unanimity;
Step 5, battery management system judge whether the capacity of battery in battery pack monomer maintains an equal level, if then jump to step 6, if not, then jumps to step 4;
Step 6, battery management system disconnect equalizer switch.
In above-mentioned steps 1, battery management system, according to the voltage detecting all battery cells in battery pack, calculates the average monomer voltage obtaining battery pack, most high monomer voltage and minimum monomer voltage.
In above-mentioned steps 2, whether be greater than default voltage difference threshold value by the difference of the most high monomer voltage and minimum monomer voltage that judge battery pack, determine whether that the capacity of battery cell is too high compared with other battery cell capacity.
In above-mentioned steps 4, the temperature of the equalizing resistance in battery management system real-time detection access battery pack, and judge that whether this temperature is higher than the first temperature threshold preset, if, then disconnect this equalizing resistance, until the temperature of equalizing resistance lower than Second Threshold temperature again by equalizing resistance connecting single batteries, if not, then proceed equalization operation.
Above-mentioned first threshold temperature is 70 degrees Celsius, and Second Threshold temperature is 65 degrees Celsius.
In above-mentioned steps 5, whether be less than default voltage difference threshold value by the difference of the most high monomer voltage and minimum monomer voltage that judge battery pack, whether the capacity deciding battery in battery pack monomer maintains an equal level.
Above-mentioned voltage difference threshold value is 10 millivolts.
The present invention is used for the conforming passive balance control system of battery maintenance group and control method is compared with the battery boosting technology of prior art, its advantage is, the present invention is by detecting battery in battery pack monomer voltage, judge whether that capacity and other battery cell capacity difference of battery cell are excessive, to consume the electricity of the excessive battery cell of this capacity, realize passive Balance route, battery maintenance group system consistency;
The present invention detects the temperature value of equalizing resistance, stops electric quantity consumption, guarantee the work safety of system when temperature is too high.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the present invention for the conforming passive balance control system of battery maintenance group;
Fig. 2 is the flow chart of the present invention for the control method of the conforming passive balance control system of battery maintenance group
Fig. 3 is the schematic diagram of the present invention for the control method of the conforming passive balance control system of battery maintenance group;
Fig. 4 is the battery cell change in voltage table of the present invention for the control method of the conforming passive balance control system of battery maintenance group;
Fig. 5 is the variations in temperature table of the present invention for equalizing resistance in the control method of the conforming passive balance control system of battery maintenance group.
Embodiment
Below in conjunction with accompanying drawing, further illustrate specific embodiments of the invention.
The present invention is open a kind of is used for the conforming passive balance control system of battery maintenance group, and this system comprises: battery management system, some with battery cell one to one equalizing resistance and with each equalizing resistance equalizer switch one to one.
Battery management system (BMS) circuit connects battery pack, the capacity of each battery cell in Real-Time Monitoring battery pack, and judges whether there is obvious capacity volume variance between each battery cell in battery pack.
Some equalizing resistances are connected in parallel with each battery cell in battery pack respectively, for consuming the electricity of corresponding battery cell when carrying out passive Balance route.
Each equalizing resistance is in series with an equalizer switch often opened; This equalizer switch respectively circuit connects battery management system, battery management system controls the opening and closing of equalizer switch, when a certain battery cell capacity and other battery cell capacity difference excessive, then its equalizer switch connected closed, consumes this battery cell electricity by equalizing resistance.
As shown in Figure 1, be the connection layout of passive balance control system and battery pack, in battery pack, be in series with n battery cell (B 1, B 2b n).Battery cell B 1on be connected in parallel to equalizing resistance R 1, this equalizing resistance R 1be connected in series with equalizer switch S 1; Same battery cell B 2on be connected in parallel to equalizing resistance R 2, this equalizing resistance R 2be connected in series with equalizer switch S 2; Battery cell B non be connected in parallel to equalizing resistance R n, this equalizing resistance R nbe connected in series with equalizer switch S n.
When charging to battery pack, by battery management system (BMS), cell capacity in module is assessed, when evaluating No. n-th cell B ncapacity higher time, then battery management system closes corresponding equalizer switch S n.As equalizer switch S nafter closed, R nstart consuming cells monomers B nelectricity, make battery cell B ncapacity reaches unanimity with other monomers gradually, reaches the conforming object of battery maintenance group system.
Battery management system also circuit is connected with hygrosensor, detect the temperature of each balancing battery respectively, when equalizing resistance carries out Balance route, temperature is too high, then disconnect this equalizing resistance by equalizer switch, stop Balance route, battery cell is reconnected again, the electricity of consuming cells monomer after the temperature of equalizing resistance reduces.
As described in Figure 2, the present invention also discloses a kind of control method for the conforming passive balance control system of battery maintenance group, and the method includes the steps of:
When step 1, battery pack carry out trickle charge, battery management system detects the magnitude of voltage of all battery cells in battery pack.Battery management system according to the voltage detecting all battery cells in battery pack, calculates the average monomer voltage Vmean obtaining battery pack, most high monomer voltage Vmax and minimum monomer voltage Vmin.
It is too high compared with other battery cell capacity that step 2, battery management system judge whether there is the capacity of battery cell in battery pack, in the present invention, judgment mode is: calculate most voltage difference Vmax-Vmin between high monomer voltage Vmax and minimum monomer voltage Vmin, and judge whether to be greater than a voltage difference threshold value, this voltage difference threshold value value 10 millivolts in the present embodiment, this value need according to the battery electrical property characteristic configuration used.If voltage difference Vmax-Vmin is greater than 10 millivolts, then jump to step 3, if not, voltage difference Vmax-Vmin is less than or equal to 10 millivolts, then jump to step 1, continues to detect battery cell voltage.
Step 3, battery management system control equalizer switch corresponding to the too high battery cell of this capacity (battery cell that namely monomer voltage is the highest) and close.
Step 4, the battery cell that monomer voltage is the highest equalizing resistance in parallel consumes the electricity of this battery cell, the capacity of this battery cell is reduced, and reaches unanimity with other battery cells gradually.
As shown in Figure 3, in the charging starting stage, No. one, No. two, No. four, the electricity of No.5 cell monomer is higher, the electricity of No. three battery cells is less.No. one, second stage, No. two, No. four, No.5 cell monomer connects equalizing resistance and starts to consume No. one, No. two, No. four, the electricity of No.5 cell monomer, No. three battery cells continue charging.Phase III, No. two, the electricity of No.5 cell monomer and the electricity of No. three battery cells maintain an equal level and stop equalization operation, No. one, No. four battery cells continue while charging by equalizing resistance consumes power.The electricity of each battery cell of final stage is full of and substantially all fair.
As shown in Figure 4, when equalization operation does not start, the voltage increase rate of battery cell is very fast, and the rate reduction starting battery cell voltage rise when equilibrium slows down.
Step 5, battery management system judge whether the capacity of battery in battery pack monomer maintains an equal level, battery management system detects the electricity of battery in battery pack monomer in real time, and judge whether most voltage difference Vmax-Vmin between high monomer voltage Vmax and minimum monomer voltage Vmin is less than or equal to voltage difference threshold value, threshold value can be 10 millivolts, if then jump to step 6, if not, then jump to step 4 and proceed equalization operation.
Step 6, battery management system disconnect equalizer switch, stop equalization operation.
As shown in Figure 5, in above-mentioned steps 4, battery management system is in real time by the temperature of each equalizing resistance in hygrosensor detection access battery pack, and judge whether that the temperature of the equalizing resistance just carrying out equalization operation is higher than the first temperature threshold preset, and if so, then disconnects this equalizing resistance, and continue to detect its problem, until the temperature of this equalizing resistance lower than Second Threshold temperature again by equalizing resistance connecting single batteries, if not, then proceed equalization operation.
Wherein, first threshold temperature is higher than Second Threshold temperature.Preferably, first threshold temperature is taken as 70 degrees Celsius, and Second Threshold temperature is taken as 65 degrees Celsius.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.

Claims (7)

1., for the conforming passive balance control method of battery maintenance group, it is characterized in that, the method is realized by passive balance control system; Described passive balance control system comprises:
Battery management system, its circuit connects the capacity of each battery cell in battery pack Real-Time Monitoring battery pack, and has judged whether obvious capacity volume variance; This battery management system also circuit is connected with hygrosensor, detects the temperature of each balancing battery respectively, and when equalizing resistance carries out Balance route, temperature is too high, then disconnect this equalizing resistance;
Some equalizing resistances, it is connected in parallel with each battery cell in described battery pack respectively; Each equalizing resistance is in series with the equalizer switch often opened;
Described battery management system connects each equalizer switch respectively, controls the opening and closing of equalizer switch, when a certain battery cell capacity and other battery cell capacity difference are excessive, then closes its equalizer switch connected, consumes this battery cell electricity;
Described passive Balance route comprises following steps:
When step 1, battery pack are charged, battery management system detects the magnitude of voltage of all battery cells in battery pack in real time;
It is too high compared with other battery cell capacity that step 2, battery management system judge whether there is the capacity of battery cell in battery pack, if so, then jumps to step 3, if not, then jump to step 1;
Step 3, battery management system control equalizer switch corresponding to the too high battery cell of this capacity and close;
The electricity of the battery cell that step 4, equalizing resistance contents of decrement are too high, makes the capacity of this battery cell and other battery cells reach unanimity;
Step 5, battery management system judge whether the capacity of battery in battery pack monomer maintains an equal level, if then jump to step 6, if not, then jumps to step 4;
Step 6, battery management system disconnect equalizer switch.
2. as claimed in claim 1 for the control method of the conforming passive balance control system of battery maintenance group, it is characterized in that, in described step 1, battery management system, according to the voltage detecting all battery cells in battery pack, calculates the average monomer voltage obtaining battery pack, most high monomer voltage and minimum monomer voltage.
3. as claimed in claim 2 for the control method of the conforming passive balance control system of battery maintenance group, it is characterized in that, in described step 2, whether be greater than default voltage difference threshold value by the difference of the most high monomer voltage and minimum monomer voltage that judge battery pack, determine whether that the capacity of battery cell is too high compared with other battery cell capacity.
4. as claimed in claim 2 for the control method of the conforming passive balance control system of battery maintenance group, it is characterized in that, in described step 4, the temperature of the equalizing resistance in battery management system real-time detection access battery pack, and judge that whether this temperature is higher than the first temperature threshold preset, if, then disconnect this equalizing resistance, until the temperature of equalizing resistance lower than Second Threshold temperature again by equalizing resistance connecting single batteries, if not, then proceed equalization operation.
5., as claimed in claim 4 for the control method of the conforming passive balance control system of battery maintenance group, it is characterized in that, described first threshold temperature is 70 degrees Celsius, and Second Threshold temperature is 65 degrees Celsius.
6. as claimed in claim 2 for the control method of the conforming passive balance control system of battery maintenance group, it is characterized in that, in described step 5, whether be less than default voltage difference threshold value by the difference of the most high monomer voltage and minimum monomer voltage that judge battery pack, whether the capacity deciding battery in battery pack monomer maintains an equal level.
7. the control method for the conforming passive balance control system of battery maintenance group as described in claim 3 or 6, is characterized in that, described voltage difference threshold value is 10 millivolts.
CN201310729959.4A 2013-12-26 2013-12-26 For the conforming passive balance control system of battery maintenance group and control method CN103647332B (en)

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CN105206897B (en) * 2014-06-30 2017-10-10 观致汽车有限公司 Apparatus and method for controlling battery pack temperature
CN104505912A (en) * 2015-01-15 2015-04-08 中国科学技术大学 Power lithium battery pack passive equalization system with temperature detection function
CN105762869A (en) * 2016-03-30 2016-07-13 张家港绿锂动力技术有限公司 Battery pack equalization control method and system
CN108063293B (en) * 2016-11-09 2020-11-20 比亚迪股份有限公司 Battery pack balance control method and control system
CN106711521B (en) * 2016-11-16 2019-05-07 安徽锐能科技有限公司 Battery pack balancing control method and control circuit
CN107276170B (en) * 2017-07-12 2020-06-12 合肥国轩高科动力能源有限公司 System and method for actively protecting battery of pure electric vehicle
CN107444158B (en) * 2017-08-10 2020-05-26 清华四川能源互联网研究院 Equalization method of modular battery pack system
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
CN107863796A (en) * 2017-10-30 2018-03-30 努比亚技术有限公司 Battery electric quantity balancing control circuit, terminal and battery electric quantity balance control method
CN108263239B (en) * 2018-02-08 2020-03-10 北京新能源汽车股份有限公司 Passive equalization circuit, fault diagnosis method and automobile
CN109017381A (en) * 2018-07-31 2018-12-18 电子科技大学 A kind of power battery pack composite balancing control method
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