CN-121986430-A - Power storage device, information processing method, and computer program

Abstract

The power storage device includes a power storage unit having a plurality of power storage cells connected in series, and a control unit. The control unit acquires a remaining capacity value of the power storage unit or the power storage unit, and when the remaining capacity value is within a predetermined range, the control unit performs full charge control on the power storage unit.

Inventors

• Cheng Benwu
• FUKUSHI ATSUSHI
• YOKOTA SAYO

Assignees

• 株式会社杰士汤浅国际

Dates

Publication Date

20260505

Application Date

20240911

Priority Date

20230927

Claims (15)

1. 1. An electrical storage device, wherein, The power storage device includes a power storage unit having a plurality of power storage cells connected in series, and a control unit, The control section acquires a remaining capacity value of the electricity storage unit or the electricity storage monomer, When the remaining capacity value is within a predetermined range, the control unit performs full charge control of the power storage unit.
2. 2. The power storage device according to claim 1, wherein, The value of the residual capacity is a state of charge.
3. 3. The power storage device according to claim 1, wherein, The residual capacity value is the dischargeable electric quantity.
4. 4. The power storage device according to claim 1, wherein, The predetermined range is a usable range set in the power storage unit or the power storage unit.
5. 5. The power storage device according to claim 4, wherein, The usable range is 50% to 90% of the state of charge.
6. 6. The power storage device according to claim 1, wherein, The power storage device includes an equalizer electrically connected to each power storage cell, The control unit obtains an unbalance amount of each of the power storage cells equalized by the equalizer based on the voltage of each of the power storage cells after the full charge control.
7. 7. The power storage device according to claim 1, wherein, The control unit performs full charge control of the power storage unit when the remaining capacity value is within a predetermined range and a specific time has elapsed since the remaining capacity value was within the predetermined range.
8. 8. The power storage device according to claim 1 or 6, wherein, The control unit outputs a full charge request of the power storage unit when the remaining capacity value is within a predetermined range or when a specific time has elapsed since the remaining capacity value was within the predetermined range.
9. 9. The power storage device according to claim 1 or 6, wherein, The electric storage device acquires the voltage of each electric storage monomer after full charge control, The power storage device determines the discharge amount of each power storage cell based on an equalizer electrically connected to each power storage cell based on the acquired voltage of each power storage cell and the voltages of the power storage cell having the lowest voltage after full charge control and other power storage cells.
10. 10. The power storage device according to claim 1 or 6, wherein, The state of charge value of the electric storage unit estimated by a current integration method that integrates the charge current and/or the discharge current flowing through the electric storage unit is corrected using the voltage of each electric storage unit after full charge control.
11. 11. The power storage device according to claim 1 or 6, wherein, The electricity storage monomer contains lithium iron phosphate as a positive electrode active material.
12. 12. The power storage device according to claim 1 or 6, wherein, The electricity storage cell contains graphite as a negative electrode active material.
13. 13. The power storage device according to claim 9, wherein, The discharge amount is determined in a region where the state of charge is 98.3% or more.
14. 14. An information processing method, wherein, The information processing method is characterized in that the following processing is executed by a computer: Obtaining an electric storage unit having a plurality of electric storage cells connected in series or a remaining capacity value of the electric storage cell, And when the residual capacity value is within a predetermined range, performing full charge control on the electric storage unit.
15. 15. A computer program, wherein, The computer program causes a computer to execute the following processing: Obtaining an electric storage unit having a plurality of electric storage cells connected in series or a remaining capacity value of the electric storage cell, And when the residual capacity value is within a predetermined range, performing full charge control on the electric storage unit.

Description

Power storage device, information processing method, and computer program Technical Field The invention relates to an electric storage device, an information processing method, and a computer program. Background In a power storage device that stores a plurality of power storage cells connected in series, there is a case where a residual capacity (REMAINING CHARGE) varies between the plurality of power storage cells with the passage of time. In order to suppress such a variation in the remaining capacity of each of the power storage cells, an equalizer for equalizing the voltages between the power storage cells is known. Patent document 1 proposes a capacity adjustment device for making the capacity among a plurality of cells uniform. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2007-244058. Disclosure of Invention Problems to be solved by the invention In the technique of patent document 1, there are cases where the accuracy of detecting the residual capacity deviation between the power storage monomers is insufficient. The purpose of the present disclosure is to provide a technique capable of improving the accuracy of detecting a residual capacity deviation between power storage cells. Means for solving the problems An electricity storage device according to one embodiment of the present disclosure includes an electricity storage unit (unit) having a plurality of electricity storage cells (cells) connected in series, and a control unit. The control unit acquires a remaining capacity value of the power storage unit or the power storage unit, and when the remaining capacity value is within a predetermined range, the control unit performs full charge control on the power storage unit. The power storage device may further include an equalizer electrically connected to each of the power storage cells, and the control unit may determine an unbalance amount of each of the power storage cells equalized by the equalizer based on a voltage of each of the power storage cells after the full charge control when the residual capacity value is within a predetermined range. ADVANTAGEOUS EFFECTS OF INVENTION According to the present disclosure, the accuracy of detecting the remaining capacity deviation between the power storage monomers can be improved. In particular, the technique of the present disclosure can be suitably applied to an electric storage unit having a flat region in an SOC (State of Charge) -OCV (Open Circuit Voltage ) graph (State of Charge-open circuit voltage graph). Drawings Fig. 1 is a graph showing the relationship between the SOC of the LFP/Gr battery and the OCV of each cell and the voltage difference between the cells. Fig. 2 is a graph of voltage values and current values at the time of charging in the case where the charge start SOC is 0% and the charge start SOC is 85%. Fig. 3 is a graph showing the relationship between the SOC of the LFP/Gr based battery and the voltage difference between the cells for each remaining capacity deviation. Fig. 4 is a perspective view showing an exemplary configuration of the power storage device. Fig. 5 is an exploded perspective view of the power storage device. Fig. 6 is a block diagram showing an exemplary configuration of the power storage device. Fig. 7 is a flowchart showing an example of the equalization processing step. Fig. 8 is a diagram illustrating imbalance determination. Detailed Description (1) An electricity storage device according to one embodiment of the present disclosure includes an electricity storage unit having a plurality of electricity storage cells connected in series, and a control unit. The control unit acquires a remaining capacity value of the power storage unit or the power storage unit, and when the remaining capacity value is within a predetermined range, the control unit performs full charge control on the power storage unit. Here, the remaining capacity may be SOC or a dischargeable electric quantity. The SOC may be a ratio Of the remaining capacity Of the electric storage unit or the electric storage unit to the full Charge capacity at that time (so-called RSOC (RELATIVE STATE Of Charge, relative state Of Charge)), or a ratio Of the remaining capacity to the full Charge capacity on the specification (so-called ASOC (Absolute State Of Charge, absolute state Of Charge)). The remaining capacity may be a physical quantity expressed in units Ah (ampere hours). In a power storage device including a plurality of power storage cells connected in series, an equalizer is used to equalize a voltage (remaining capacity) deviation generated between the power storage cells, thereby preventing overcharge or overdischarge of the power storage device. In the equalization process, the other power storage cells are discharged so as to match the voltage of the specific power storage cell, and the voltage is equalized among the power storage cells. In order to operate the equalizer, it is neces