CN109755681B - Battery cell equalization processing method and system and power battery pack - Google Patents
Battery cell equalization processing method and system and power battery pack Download PDFInfo
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- CN109755681B CN109755681B CN201811639736.8A CN201811639736A CN109755681B CN 109755681 B CN109755681 B CN 109755681B CN 201811639736 A CN201811639736 A CN 201811639736A CN 109755681 B CN109755681 B CN 109755681B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a battery cell equalization processing method and system and a power battery pack. The battery cell equalization processing method comprises an equalization starting step; a voltage transmission comparison step, namely sending the voltage value of the first battery cell as a line voltage value to a next battery cell connected with the first battery cell, and comparing the difference between the voltage value of the next battery cell and the line voltage value with a preset voltage threshold value; a balancing step, namely if the difference between the two voltage values is smaller than a preset voltage threshold value, keeping the voltage value of the next electric core unchanged, and simultaneously transmitting the minimum voltage value of the two voltage values as a line voltage value to the electric core positioned at the downstream of the next electric core; otherwise, the voltage of the next battery cell is equalized to the minimum voltage value of the two voltage values, and the minimum voltage value of the two voltage values is transmitted to the battery cell located downstream of the next battery cell as a line voltage value. The invention can accelerate the program execution efficiency and reduce the response time.
Description
Technical Field
The invention relates to the technical field of power battery voltage processing, in particular to a battery cell equalization processing method; meanwhile, the invention also relates to a battery cell equalization processing system based on the method and a power battery pack loaded with the processing system.
Background
The conventional power battery management system, namely a BMS system, adopts a centralized distributed system and consists of a main board and a plurality of slave boards; the main task of the slave board is to collect the state information (such as voltage, temperature, etc.) of the battery core, and the master board undertakes all calculation and storage tasks. In the cell balancing function, at present, a multi-purpose mainboard is used for controlling the strategy of starting and balancing, and in the means, a main control program is needed to calculate the maximum cell voltage and the minimum cell voltage, then whether cell balancing is started or not is judged according to the maximum pressure difference, after the cell balancing is started, the main control program judges which cells need to be balanced, a cell balancing switch signal is set to be 1, and a cell balancing switch signal which does not need to be balanced is set to be 0, so that the calculation and storage pressure of the mainboard is larger, the program operation efficiency is reduced, the response time is prolonged, and the battery management efficiency is influenced.
Disclosure of Invention
In view of this, the present invention provides a cell equalization processing method to improve the battery optimization efficiency and reduce the response time.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a cell equalization processing method for equalizing the voltage of a plurality of connected cells comprises the following steps:
a step of starting equalization;
a voltage transmission comparison step, namely sending the voltage value of the first battery cell as a line voltage value to a next battery cell connected with the first battery cell, and comparing the difference between the voltage value of the next battery cell and the line voltage value with a preset voltage threshold value;
a balancing step, namely if the difference between the two voltage values is smaller than a preset voltage threshold value, keeping the voltage value of the next electric core unchanged, and simultaneously transmitting the minimum voltage value of the two voltage values as a line voltage value to the electric core positioned at the downstream of the next electric core; if the difference between the two voltage values is greater than a preset voltage threshold, balancing the voltage of the next electric core into the minimum voltage value of the two voltage values, and meanwhile, transmitting the minimum voltage value of the two voltage values as a line voltage value to the electric core positioned at the downstream of the next electric core;
and a balancing finishing step, namely repeating the balancing step until the difference between the voltage value of each electric core and the line voltage value received by the electric core is smaller than a preset voltage threshold value.
Furthermore, the voltage threshold is 0.01-0.03V.
Further, the voltage threshold is 0.02V.
Compared with the prior art, the invention has the following advantages:
the battery cell balancing scheme does not need control of a mainboard, most of calculation tasks are dispersed to each battery cell controller, balancing processing in battery management is completed by cooperation of each battery cell controller, program execution efficiency can be accelerated, response time is shortened, and a BMS system can process information more efficiently and in real time and send control commands.
The invention also provides a battery cell equalization processing system, which is used for equalizing the voltage of a plurality of connected battery cells, and comprises:
a control unit provided in plurality corresponding to each of the battery cells;
the comparators are arranged in a plurality of ways corresponding to the control units, and under the control of the corresponding control units, the comparators compare the difference between the voltage value of the corresponding battery cell and the line voltage value received by the battery cell with a preset voltage threshold value so as to enable the control units to control the voltage balance of the corresponding battery cells.
In addition, the invention also provides a power battery pack which is formed by connecting a plurality of battery cells, wherein the battery cell equalization processing system is loaded on the power battery pack.
The battery cell equalization processing system and the power battery pack have the same effect as the battery cell equalization processing method, and are not described again here.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention, and the description is given by way of example only and without limitation to the terms of relative positions. In the drawings:
fig. 1 is a connection block diagram of a cell equalization processing system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a state of a second cell equalization processing method according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a second state of a battery cell equalization processing method according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a state three of a battery cell equalization processing method according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of a state four of a battery cell equalization processing method according to a second embodiment of the present invention;
fig. 6 is a schematic diagram of a battery cell equalization processing method in a fifth state according to the second embodiment of the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present invention may be combined with each other; the described embodiments are also only some, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
As shown in fig. 1, the present embodiment relates to a cell equalization processing system, configured to equalize voltages of a plurality of connected cells, where the processing system includes a control unit and a comparator. Wherein the control unit is provided in plural in correspondence with each of the battery cells; the comparators are arranged in a plurality of ways corresponding to the control units, and under the control of the corresponding control units, the comparators compare the difference between the voltage value of the corresponding battery cell and the line voltage value received by the battery cell with a preset voltage threshold value so as to enable the control units to control the voltage balance of the corresponding battery cells.
Example two
The present embodiment relates to a method for cell equalization processing based on the first embodiment, where the method performs voltage equalization processing on a plurality of connected cells, and the method includes the following steps:
a step of starting equalization;
a voltage transmission comparison step, namely sending the voltage value of the first battery cell as a line voltage value to a next battery cell connected with the first battery cell, and comparing the difference between the voltage value of the next battery cell and the line voltage value with a preset voltage threshold value;
a balancing step, namely if the difference between the two voltage values is smaller than a preset voltage threshold value, keeping the voltage value of the next electric core unchanged, and simultaneously transmitting the minimum voltage value of the two voltage values as a line voltage value to the electric core positioned at the downstream of the next electric core; if the difference between the two voltage values is greater than a preset voltage threshold, balancing the voltage of the next electric core into the minimum voltage value of the two voltage values, and meanwhile, transmitting the minimum voltage value of the two voltage values as a line voltage value to the electric core positioned at the downstream of the next electric core;
and a balancing finishing step, namely repeating the balancing step until the difference between the voltage value of each electric core and the line voltage value received by the electric core is smaller than a preset voltage threshold value.
Specifically, taking eight cells connected to each other as an example shown in fig. 2, the method of the present invention is described in detail as follows:
for convenience of description, numbers 0, 1, 2, 3, 4, 5, 6, and 7 are respectively assigned to the eight battery cells shown in fig. 2, and starting from the battery cell No. 0, the initial voltages of the battery cells are 3.80V, 3.81V, 3.83V, 3.80V, 3.78V, 3.80V, 3.79V, and 3.78V, respectively. The preset voltage threshold is 0.02V. The specific equalization method is as follows:
when the equalization start condition starts, equalization is started. At this time, the equalization is started by the cell numbered 0, and the cell 0 sends the cell voltage V0 of the cell 0 to the cell 1, that is, sends the cell voltage of 3.80V, and at this time, the voltage is the line voltage value Vi.
The control unit of the battery cell 1 compares the line voltage values Vi and V1, and if | V1-Vi | <0.02V, the battery cell 1 does not need to start equalization, and min (Vi, V1) is transmitted to the battery cell 2, with the result shown in fig. 3. As shown in fig. 3, since | V1-Vi | ═ 3.80-3.81| ═ 0.01V <0.02V, cell 1 transmits the minimum voltage value of 3.80V out of Vi and V1 to cell 2 as the line voltage value Vi while maintaining the original voltage of 3.81V.
Similarly, the control unit of the battery cell 2 compares the magnitudes of Vi and V2, and if | V2-Vi | <0.02V, the battery cell 2 does not need to be equalized, and if | V2-Vi | > is 0.02V, the battery cell 2 needs to be equalized. Based on fig. 3, | V2-Vi | ═ 3.83-3.80| ═ 0.03V >0.02V, at this time, it is necessary to equalize cell 2, and the minimum voltage value of V2 and Vi is taken as the voltage value of cell 2, that is, the voltage of cell 2 is decreased to 3.80V, and min (Vi, V2) is transmitted to cell 3, and the result is as shown in fig. 4.
The above steps are repeated until the cell 7 transmits the minimum voltage to the cell 0, so that the transmission of the minimum voltages of 8 cells to the cell 0 is completed, and the equalization of a part of the cells is completed, and the result is shown in fig. 5.
And performing a second round of equalization, and continuing to forward transmit the minimum cell voltage until the difference between the voltage values of all the battery cells and the line voltage value received by the battery cell is smaller than a preset voltage threshold value, so as to complete equalization, wherein the final result is shown in fig. 6.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A cell equalization processing method for equalizing the voltage of a plurality of connected cells is characterized by comprising the following steps:
a step of starting equalization;
a voltage transmission comparison step, namely sending the voltage value of a first battery cell as a line voltage value to a next battery cell connected with the first battery cell, and comparing the difference between the voltage value of the next battery cell and the line voltage value with a preset voltage threshold value;
a balancing step, namely if the difference between the two voltage values is smaller than a preset voltage threshold value, keeping the voltage value of the next electric core unchanged, and simultaneously transmitting the minimum voltage value of the two voltage values as a line voltage value to the electric core positioned at the downstream of the next electric core; if the difference between the two voltage values is greater than a preset voltage threshold, balancing the voltage of the next electric core into the minimum voltage value of the two voltage values, and meanwhile, transmitting the minimum voltage value of the two voltage values as a line voltage value to the electric core positioned at the downstream of the next electric core;
and a balancing finishing step, namely repeating the balancing step until the difference between the voltage value of each electric core and the line voltage value received by the electric core is smaller than a preset voltage threshold value.
2. The cell equalization processing method according to claim 1, characterized in that: the voltage threshold is 0.01-0.03V.
3. The cell equalization processing method according to claim 2, characterized in that: the voltage threshold is 0.02V.
4. A cell equalization processing system for equalizing voltages of a plurality of connected cells, the processing system comprising:
a control unit provided in plurality corresponding to each of the battery cells;
the comparators are arranged in a plurality of corresponding control units and are controlled by the corresponding control units to compare the difference between the voltage value of the corresponding battery cell and the line voltage value received by the battery cell with a preset voltage threshold value so as to enable the control units to control the voltage balance of the corresponding battery cells;
and the processing system executes the following steps when carrying out voltage equalization processing on a plurality of connected battery cores:
a step of starting equalization;
a voltage transmission comparison step, namely sending the voltage value of a first battery cell as a line voltage value to a next battery cell connected with the first battery cell, and comparing the difference between the voltage value of the next battery cell and the line voltage value with a preset voltage threshold value;
a balancing step, namely if the difference between the two voltage values is smaller than a preset voltage threshold value, keeping the voltage value of the next electric core unchanged, and simultaneously transmitting the minimum voltage value of the two voltage values as a line voltage value to the electric core positioned at the downstream of the next electric core; if the difference between the two voltage values is greater than a preset voltage threshold, balancing the voltage of the next electric core into the minimum voltage value of the two voltage values, and meanwhile, transmitting the minimum voltage value of the two voltage values as a line voltage value to the electric core positioned at the downstream of the next electric core;
and a balancing finishing step, namely repeating the balancing step until the difference between the voltage value of each electric core and the line voltage value received by the electric core is smaller than a preset voltage threshold value.
5. The utility model provides a power battery package, is connected by a plurality of electric cores and constitutes its characterized in that: the battery cell equalization processing system of claim 4 is loaded on the power battery pack.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102437384B (en) * | 2006-11-06 | 2014-08-06 | 日本电气株式会社 | Battery control system and battery control method |
| JP5477448B1 (en) * | 2012-11-07 | 2014-04-23 | 株式会社豊田自動織機 | Voltage equalization device |
| CN104283241A (en) * | 2013-07-05 | 2015-01-14 | 上海中聚佳华电池科技有限公司 | Battery charging and discharging device and method |
| CN106611984B (en) * | 2016-03-15 | 2020-12-11 | 深圳芯典半导体科技有限公司 | Battery management method and system |
| CN107306040B (en) * | 2016-04-25 | 2020-04-17 | 东北大学 | Control method for equalizing charge of battery |
| CN106340923B (en) * | 2016-09-29 | 2018-12-14 | 杰华特微电子（张家港）有限公司 | Battery equalizing circuit and control method and battery system |
| CN106505672A (en) * | 2016-11-15 | 2017-03-15 | 电子科技大学 | A kind of series connected super-capacitor module charging balanced circuit and its equalization methods |
| CN106998089A (en) * | 2017-05-18 | 2017-08-01 | 四川长虹电器股份有限公司 | A kind of electrokinetic cell active equalization control circuit and system |
| CN107681740A (en) * | 2017-11-07 | 2018-02-09 | 联华聚能科技股份有限公司 | The method of equilibrium cell voltage |
| CN108767928A (en) * | 2018-06-29 | 2018-11-06 | 深圳市安科讯实业有限公司 | More battery balancing methods and device |
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Address after: No.8899 Xincheng Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee after: SVOLT Energy Technology Co.,Ltd. Address before: 213200 168 Huacheng Road, Jintan District, Changzhou, Jiangsu Patentee before: SVOLT Energy Technology Co.,Ltd. |