CN105610209A - Passive equalization method of battery pack - Google Patents
Passive equalization method of battery pack Download PDFInfo
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- CN105610209A CN105610209A CN201510683317.4A CN201510683317A CN105610209A CN 105610209 A CN105610209 A CN 105610209A CN 201510683317 A CN201510683317 A CN 201510683317A CN 105610209 A CN105610209 A CN 105610209A
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Abstract
The invention discloses a passive equalization method of a battery pack. The method comprises the following steps of selecting an equalization point; recording voltage values of each monomer at different moments during a charging process; calculating a voltage average value of all the monomers at the same time in a group; calculating a difference value of each monomer voltage and the voltage average value; drawing on time according to the difference value of each monomer voltage and the voltage average value; using a slope of each curve to determine a relative size of a monomer capacity and using a relative up and down position among the curves to determine a relative size of a residual electricity quantity; calibrating an equalization point; distributing and equalizing the current; calculating a terminal point displacement; keeping equalization and adjusting equalization. By using the passive equalization method of the battery pack provided in the invention, a difference of residual electricity quantity percentages among batteries and a difference among battery monomer capacities are considered so that accurate electric quantity equalization is performed. An existing BMS system apparatus is compatible, a practical side is wide and heat and energy consumption is less and can be neglected during an equalization process.
Description
Technical field
The present invention relates to a kind of battery management, particularly a kind of passive equalization methods of battery pack.
Background technology
Along with the development of battery technology, lithium ion battery cost constantly declines, and energy density is large, and memory-less effect, has extended cycle life, and the scope of application is more and more wider. But lithium ion battery voltage only has three or four volts, need a large amount of series connection just can reach required voltage grade. Use such as the voltages of 380 volts just need 100 multi-section serials, but connect to use, 2000 above battery lifes of circulation are reduced to below 500 times. And can and recycle the difference of number of times due to inside battery characteristic, operating temperature in use procedure, the state-of-charge of battery can be uneven. No matter be charging process or discharge process, in the time that certain batteries reaches terminal, can not discharge and recharge again, and whole battery pack does not also reach terminal, can not use to greatest extent the energy of battery pack.
Conventionally analyze the difference source of state-of-charge, mainly contain difference, the difference of capacity attenuation etc. of self-discharge rate between monomer. The object of passive equilibrium is to reach the cell that the whole pool-size of battery pack is not less than minimum capacity. The technical scheme that patent 201410825991.7 provides is to determine that a battery dump energy can accurately lean on the definite scope of open-circuit voltage, then according to the anti-dump energy that pushes away each monomer of voltage tester, using average residual electric weight as equalization target. The shortcoming of this method is only considered the difference of dump energy percentage, does not consider the difference of battery cell capacity. Because cannot carry out accurately electric quantity balancing.
Summary of the invention
The present invention seeks to: a kind of passive equalization methods of battery pack is provided, had both considered the difference of dump energy percentage between battery, consider again the difference between battery cell capacity, thereby carry out electric quantity balancing accurately.
Technical scheme of the present invention is:
A passive equalization methods for battery pack, comprising:
Step 1, selected equilibrium point, after described equilibrium point refers to that equilibrium completes, each battery cell has a SOC, and in battery pack, the occurrence of each monomer SOC, has formed equilibrium point;
Step 2, record the magnitude of voltage of the each monomer of different time points in charging process;
Step 3, calculate all monomers in group at average voltage in the same time mutually;
Step 4, calculate the difference of each monomer voltage and average voltage;
Step 5, with the difference of each monomer voltage and average voltage, the time is mapped;
Step 6, determine the relative size of monomer capacity with every slope of a curve, the descending capacity of curve is large, and the up capacity of curve is little;
Step 7, determine the relative size of dump energy with the relative upper-lower position between curve, the dump energy remaining on is large;
Step 8, demarcation equilibrium point, be adjusted to curve monomer charging terminal upwards under the charging terminal of the downward monomer of curve;
Step 9, distribution euqalizing current, be inclined upwardly the highest monomer in final position as benchmark taking curve, and euqalizing current is set to 0, and taking the downward-sloping charging of curve final position, minimum monomer is full electric current, all the other monomers, taking incline direction and final position as standard, are got median;
Step 10, the displacement of calculating terminal, in charging process subsequently, calculate each monomer under euqalizing current effect, and the displacement of charging terminal, adjusts euqalizing current, makes monomer arrive balanced terminal simultaneously;
Step 11, keep in balance, reach after equilibrium, the relation according to each monomer euqalizing current with balanced displacement, calculates and keeps the static euqalizing current value of terminal;
Step 12, adjustment equilibrium, when the calculated value of step 11 can not meet balanced maintenance, according to the euqalizing current value of step 11 and terminal velocity of displacement, adjust euqalizing current.
Preferably, equilibrium point is set as all battery cell 100%SOC described in step 1, or 0%SOC.
Advantage of the present invention is:
The passive equalization methods of disclosed battery pack, both considered the difference of dump energy percentage between battery, consider again the difference between battery cell capacity, thereby carry out electric quantity balancing accurately, compatible existing BMS system and device, practical wide, and balancing procedure heat and energy consumes less can ignoring.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described:
The situation that in Fig. 1 embodiment of the present invention, several typical monomer voltages and average voltage difference change with charge capacity;
In Fig. 2 embodiment of the present invention, all monomers are full of electric balanced terminal schematic diagram simultaneously.
Detailed description of the invention
The passive equalization methods of the battery pack that the present embodiment is shown, objective for implementation is LiFePO4 seven meter Kao Site 538V-117Ah-138 strings, specifically comprises the following steps:
Step 1, selected equilibrium point, after described equilibrium point refers to that equilibrium completes, each battery cell has a SOC, and in battery pack, the occurrence of each monomer SOC, has formed equilibrium point. Because passive equilibrium can not make the capacity of the minimum monomer of the whole pool-size exceed capacity of battery pack, therefore equilibrium point is generally set as all battery cell 100%SOC, or 0%SOC, also can set equilibrium point according to application target and environment.
Step 2, record the magnitude of voltage of the each monomer of different time points in charging process.
Step 3, calculate all monomers in group at average voltage in the same time mutually.
Step 4, calculate the difference of each monomer voltage and average voltage.
Step 5, with the difference of each monomer voltage and average voltage, charge capacity is mapped; As shown in Figure 1, be the situation that several typical monomer voltages and average voltage difference change with charge capacity.
Step 6, determine the relative size of monomer capacity with every slope of a curve, the descending capacity of curve is large, and the up capacity of curve is little.
Step 7, determine the relative size of dump energy with the relative upper-lower position between curve, the dump energy remaining on is large.
Step 8, demarcation equilibrium point, because balanced object is only to make battery pack performance heap(ed) capacity, it is exactly the capacity of the minimum monomer of capacity that passive equilibrium can make the heap(ed) capacity of battery pack performance, as long as therefore make the monomer of capacity minimum be discharged at first in discharge process, in charging process, be full of at first electricity, just think and reached balanced object. The punctuate of equilibrium point is just fairly simple like this, and curve monomer charging terminal is upwards adjusted under the charging terminal of the downward monomer of curve.
Step 9, distribution euqalizing current, be inclined upwardly the highest monomer in final position as benchmark taking curve, and euqalizing current is set to 0, and taking the downward-sloping charging of curve final position, minimum monomer is full electric current, all the other monomers, taking incline direction and final position as standard, are got median.
Step 10, the displacement of calculating terminal, in charging process subsequently, calculate each monomer under euqalizing current effect, and the displacement of charging terminal, adjusts euqalizing current, makes monomer arrive balanced terminal simultaneously. As shown in Figure 2, be full of the schematic diagram of electric balanced terminal for all monomers simultaneously.
Step 11, keep in balance, reach after equilibrium, the relation according to each monomer euqalizing current with balanced displacement, calculates and keeps the static euqalizing current value of terminal.
Step 12, adjustment equilibrium, when the calculated value of step 11 can not meet balanced maintenance, according to the euqalizing current value of step 11 and terminal velocity of displacement, adjust euqalizing current.
The passive equalization methods of disclosed battery pack, both considered the difference of dump energy percentage between battery, consider again the difference between battery cell capacity, thereby carry out electric quantity balancing accurately, compatible existing BMS system and device, practical wide, and balancing procedure heat and energy consumes less can ignoring.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this. All modifications that the Spirit Essence of main technical schemes does according to the present invention, within all should being encompassed in protection scope of the present invention.
Claims (2)
1. a passive equalization methods for battery pack, is characterized in that, comprising:
Step 1, selected equilibrium point, after described equilibrium point refers to that equilibrium completes, each battery cell has a SOC, and in battery pack, the occurrence of each monomer SOC, has formed equilibrium point;
Step 2, record the magnitude of voltage of the each monomer of different time points in charging process;
Step 3, calculate all monomers in group at average voltage in the same time mutually;
Step 4, calculate the difference of each monomer voltage and average voltage;
Step 5, with the difference of each monomer voltage and average voltage, the time is mapped;
Step 6, determine the relative size of monomer capacity with every slope of a curve, the descending capacity of curve is large, and the up capacity of curve is little;
Step 7, determine the relative size of dump energy with the relative upper-lower position between curve, the dump energy remaining on is large;
Step 8, demarcation equilibrium point, be adjusted to curve monomer charging terminal upwards under the charging terminal of the downward monomer of curve;
Step 9, distribution euqalizing current, be inclined upwardly the highest monomer in final position as benchmark taking curve, and euqalizing current is set to 0, and taking the downward-sloping charging of curve final position, minimum monomer is full electric current, all the other monomers, taking incline direction and final position as standard, are got median;
Step 10, the displacement of calculating terminal, in charging process subsequently, calculate each monomer under euqalizing current effect, and the displacement of charging terminal, adjusts euqalizing current, makes monomer arrive balanced terminal simultaneously;
Step 11, keep in balance, reach after equilibrium, the relation according to each monomer euqalizing current with balanced displacement, calculates and keeps the static euqalizing current value of terminal;
Step 12, adjustment equilibrium, when the calculated value of step 11 can not meet balanced maintenance, according to the euqalizing current value of step 11 and terminal velocity of displacement, adjust euqalizing current.
2. the passive equalization methods of battery pack according to claim 1, is characterized in that, equilibrium point is set as all battery cell 100%SOC described in step 1, or 0%SOC.
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Cited By (6)
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| CN106926741A (en) * | 2017-04-28 | 2017-07-07 | 胡楷 | New-energy automobile power-driven system and its battery electric quantity active equalization method |
| CN107612071A (en) * | 2017-09-24 | 2018-01-19 | 合肥国轩高科动力能源有限公司 | A kind of battery cell fault verification and processing method |
| CN109017429A (en) * | 2018-10-09 | 2018-12-18 | 天津易众腾动力技术有限公司 | A kind of passive equalization algorithm of full working scope of power battery pack quantization |
| CN111469713A (en) * | 2020-04-28 | 2020-07-31 | 东风汽车集团有限公司 | Passive equalization control method for new energy automobile power battery |
| CN113581008A (en) * | 2021-09-28 | 2021-11-02 | 深圳万甲荣实业有限公司 | Stage type power distribution power supply system for new energy automobile |
| CN116760149A (en) * | 2023-08-09 | 2023-09-15 | 深圳市德兰明海新能源股份有限公司 | Power supply equalizing device, power supply equalizing method and power supply system |
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| CN109664795B (en) * | 2019-01-11 | 2020-06-05 | 北京经纬恒润科技有限公司 | Battery pack passive equalization method and battery management system |
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| CN111469713A (en) * | 2020-04-28 | 2020-07-31 | 东风汽车集团有限公司 | Passive equalization control method for new energy automobile power battery |
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| CN116760149A (en) * | 2023-08-09 | 2023-09-15 | 深圳市德兰明海新能源股份有限公司 | Power supply equalizing device, power supply equalizing method and power supply system |
| CN116760149B (en) * | 2023-08-09 | 2024-01-05 | 深圳市德兰明海新能源股份有限公司 | Power supply equalizing device, power supply equalizing method and power supply system |
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