JP2012029417A5

JP2012029417A5 - Battery control system, control method therefor, and battery system

Info

Publication number: JP2012029417A5
Application number: JP2010164460A
Authority: JP
Filing date: 2010-07-22
Publication date: 2012-09-20
Anticipated expiration: 2030-07-22

Claims

A voltage detection circuit that detects the voltage of each of a plurality of serially connected unit cells;
An SOC adjustment circuit that adjusts the SOC of each unit cell in a direction to equalize the remaining capacity (SOC) of each unit cell;
A battery control system comprising: a control circuit that detects an SOC variation based on each voltage of the unit cells detected by the voltage detection circuit, and transmits an adjustment command to the SOC adjustment circuit,
The control circuit
Discretize the SOC in a predetermined step width;
Among the discretized SOC range, a SOC range having a high probability of staying in SOC of a single cell or a multi-series battery is detected;
An adjustment command for equalizing each SOC of the single battery when the SOC of the single battery or the multi-series battery is in the SOC range where the staying probability is high is within or outside the SOC range where the staying probability is high. A battery control system characterized by transmitting to an SOC adjustment circuit.

A voltage detection circuit that detects the voltage of each of a plurality of serially connected unit cells;
An SOC adjustment circuit capable of adjusting the SOC for each unit cell so that the SOC of each unit cell is substantially equal;
A battery control system comprising a control circuit that detects an SOC variation degree based on each voltage of the unit cells detected by the voltage detection circuit, and sends an adjustment command to the SOC adjustment circuit from the SOC variation degree.
The control circuit
Discretize the SOC in a predetermined step width;
Calculating a probability distribution in which the SOC stays for each of the discretized SOC ranges;
From the above probability distribution, a SOC range having a high probability of staying in the SOC of a single battery or multiple series batteries is detected,
An adjustment command for equalizing each SOC of the single battery when the SOC of the single battery or the multi-series battery is in the range of the high SOC is within or outside the SOC range where the residence probability is high, A battery control system characterized by transmitting to the SOC adjustment circuit.

The control circuit according to claim 1 or 2, wherein the control circuit is configured such that the SOC of the unit cell or the multi-series battery is within the SOC range where the staying probability is high, and the current flowing in and out of the multi-series battery is equal to or less than a predetermined value. A battery control system characterized by detecting SOC variation based on the voltage of each unit cell.

In any one of claims 1 to 3, wherein the control circuit includes a probability distribution calculated by the SOC that the discretization combining a parameter prepared for each SOC was the discretization, and the probability distribution of the SOC obtained by the discretized The battery control system characterized by determining the SOC range which should equalize SOC of the said cell based on the said parameter.

The battery control system according to claim 4, wherein the parameter is a deterioration parameter determined based on a storage test of a single cell or a multi-series battery, or a cycle test.

The predetermined step width for discretizing the SOC according to any one of claims 1 to 5 is the life of the unit cell, the SOC variation of the individual difference of the full charge capacity generated by transition of the SOC, the SOC variation degree permitted by the system A battery control system, which is determined by an SOC error resulting from measurement error of the voltage detection circuit or the voltage detection circuit.

The control circuit according to any one of claims 1 to 6, wherein the control circuit stores the SOC range having a high probability of staying when the power of the control circuit is turned off, and the recording means when the control circuit is restarted. The battery control system characterized by reading from.

In any one of claims 1 to 7,
Wherein the control circuit, SOC of the single cell or multi-series battery located outside the current SOC adjustment range, SOC of the single cell or multi-series battery, beyond the time it stayed said current SOC adjustment range, other battery control system, characterized in that came to have stayed SOC range, the SOC adjustment range, changing said current SOC adjustment range or al the other SOC range.

In any one of claims 1 to 8,
When the current SOC of the unit cell or the multiple series battery is out of the SOC adjustment range, the control circuit causes a difference (variation) in the SOC among the unit cells, and when the high stay probability SOC is entered later, A battery control system characterized by performing equalization control to equalize SOC among batteries.

In any one of claims 1 to 9,
Wherein the control circuit is set higher current SOC adjustment range, when the SOC of the single cell or multi-series battery stayed over a predetermined time outside the current SOC adjustment range, lower the SOC adjustment range A battery control system characterized by changing to a value.

In claim 10,
The control circuit changes the SOC adjustment range to a high value when the current flowing in and out of the multi-series battery is equal to or less than a predetermined value, and the SOC of the unit cell or the multi-series battery is higher than the SOC adjustment range. Battery control system characterized by

In claim 1,
The control circuit detects an SOC variation degree from each voltage of the unit cells to determine an SOC adjustment range for transmitting an adjustment command to the SOC adjustment circuit, and the determined SOC adjustment range is a power supply of the control circuit. When the control circuit is restarted, the recorded SOC adjustment range is read out, and the SOCs of the unit cells are equalized based on the read SOC adjustment range. A battery control system characterized by transmitting an adjustment command to the SOC adjustment circuit.

The control circuit according to claim 1 or 2, wherein the control circuit divides time by a predetermined step width, calculates a probability distribution of SOC of a single cell or multi-series battery at each time divided by the step width, and the step width The SOC range with a high staying probability in each time divided by the step width is detected from the probability distribution obtained by each time divided by the step width, and the step width most matching the conditions according to the current use condition of the multi-series battery The adjustment command to equalize the SOCs of the unit cells when the divided time in is selected and the SOCs of the unit cells or the multiple series batteries are within the SOC range where the staying probability calculated in the selected time is high A battery control system characterized by transmitting to the SOC adjustment circuit.

The control circuit according to claim 1 or 2, wherein the control circuit includes a start circuit for starting itself at predetermined intervals while the operation of the battery control system is stopped, and the operation of the battery control system is stopped. The SOC of the unit cell or multi-series battery is discretized with a predetermined step width, the probability distribution is calculated based on the discretized SOC, and the SOC range having a high staying probability of the SOC of the unit cell or multi-series battery is calculated from the probability distribution. A battery control system characterized by detecting.

A voltage detection step of detecting the voltage of each of the cells connected in multiple series;
An SOC adjustment step of adjusting the SOC of each unit cell in a direction to equalize the remaining capacity (SOC) of each unit cell;
A control method of a battery control system, comprising: a control step of detecting an SOC variation based on each voltage of the unit cells detected in the voltage detection step, and transmitting a start command of the SOC adjustment step,
A discretization step of discretizing the SOC with a predetermined step width;
A high stay probability SOC range detection step of detecting an SOC range in which the stay probability of the SOC of the single battery or the multi-series battery is high from the discretized SOC range;
The adjustment command for equalizing the SOCs of the unit cells when the unit cell or the multi-series battery SOC is within the high stay probability SOC range is the SOC adjustment within or outside the high stay probability SOC range A control method of a battery control system comprising the step of transmitting a start command of the step.

The control circuit according to claim 1, wherein
The SOC range of the unit cell or the multi-series battery is set in advance for obtaining the equalization execution value according to the SOC variation,
A battery control system characterized by changing a SOC range set in advance to obtain the equalization execution value when a state where the execution value of the SOC equalization can not be obtained continues for a predetermined time or more.

A battery system comprising the battery control system according to any one of claims 1 to 14 or 16 and two or more unit cells.