Management device and power storage system

Patent metadata

Field	Value
Publication number	US-11444469-B2
Application number	US-201917053103-A
Country	US
Kind code	B2
Filing date	Apr 5, 2019
Priority date	May 14, 2018
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

In order to improve safety while suppressing a decrease in efficiency of an equalizing process between a plurality of cells, controller executes an equalizing process between a plurality of cells by controlling a plurality of discharge circuits based on voltages of the plurality of cells measured by voltage measurement unit. Anomaly determination circuit determines whether or not the voltage of each of cells measured by voltage measurement unit is within a normal range. Controller includes, for each first cycle, a first discharge suspension period during which the voltages of the plurality of cells are measured without an influence of the equalizing process during execution of the equalizing process between the plurality of cells and includes, for each second cycle longer than the first cycle, a second discharge suspension period during which a determination result according to anomaly determination circuit is fixed.

First claim

The invention claimed is:

1. A management device comprising:
a voltage measurement unit that measures voltages of a plurality of cells connected in series;
a plurality of discharge circuits each connected in parallel to a respective one of the plurality of cells;
an anomaly determination circuit that determines whether or not each of the voltages of the plurality of cells measured by the voltage measurement unit is within a normal range; and
a controller that executes an equalizing process between the plurality of cells by controlling the plurality of discharge circuits based on the voltages of the plurality of cells measured by the voltage measurement unit,
wherein
the controller sets, for each first cycle, a first discharge suspension period during which the voltages of the plurality of cells are measured without an influence of the equalizing process during the execution of the equalizing process between the plurality of cells and sets, for each second cycle longer than the first cycle, a second discharge suspension period during which a determination result according to the anomaly determination circuit is fixed.

2. The management device according to claim 1 , wherein the second discharge suspension period is set to be longer than the first discharge suspension period.

3. The management device according to claim 1 , wherein
the voltage measurement unit includes a first voltage measurement circuit and a second voltage measurement circuit,
the first voltage measurement circuit supplies the voltages of the plurality of cells measured by the voltage measurement unit to the controller and the anomaly determination circuit,
the discharge circuit is connected to the second voltage measurement circuit, and
the second voltage measurement circuit supplies the voltages of the plurality of cells measured by the voltage measurement unit to the controller.

4. The management device according to claim 1 , wherein
the controller includes a microcomputer,
the microcomputer issues an anomaly detection signal to a higher-level control device when at least one of the voltages of the plurality of cells acquired by communication from the voltage measurement unit is out of the normal range, and
when at least one of the voltages of the plurality of cells is out of the normal range, after a delay time longer than or equal to a time required for a stop processing by the microcomputer has passed, the anomaly determination circuit executes a hardware stop processing.

5. A power storage system comprising:
a plurality of cells connected in series; and
the management device according to claim 1 , the management device managing the plurality of cells.

Assignees

• Sanyo Electric Co

Inventors

• Nakayama Masato
• Mukae Hidetsugu
• Nakagawa Yousuke
• Ito Masanori

Classifications

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/64

  against overvoltage · CPC title

• H02J7/54 Primary

  Passive balancing, e.g. using resistors or parallel MOSFETs · CPC title

• H01M10/482

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title