Laminated battery, separator and connection method of internal resistance measuring device

Patent metadata

Field	Value
Publication number	US-10044054-B2
Application number	US-201415128344-A
Country	US
Kind code	B2
Filing date	Mar 28, 2014
Priority date	Mar 28, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A separator of a fuel cell to be laminated while sandwiching a membrane electrode assembly forming a power generation region includes a source connection point tab for inputting and outputting an alternating current for internal resistance measurement, a sense connection point tab for detecting a potential of the alternating current input and output to and from the source connection point tab and separation portion configured to separate the sense connection point tab from a current path of the alternating current for internal resistance measurement from the source connection point tab to the power generation region.

First claim

The invention claimed is:

1. A laminated battery system, comprising:
an alternating-current power supply unit connected to an internal resistance measurement object including at least a laminated battery, a unit cell being laminated in the laminated battery, and configured to output an alternating current to the internal resistance measurement object;
an alternating current adjustment unit programmed to input a positive-electrode side alternating-current and a negative-electrode side alternating-current, generate a command voltage based on the positive-electrode side alternating-current and the negative-electrode side alternating-current, and cause the alternating-current power supply unit to output, based on the generated command voltage, an adjusted alternating current such that a positive-electrode side alternating-current potential difference between a potential on a positive electrode side of the internal resistance measurement object and a potential of an intermediate part matches a negative-electrode side alternating-current potential difference between a potential on a negative-electrode side of the internal resistance measurement object and the potential of the intermediate part; and
a calculation unit programmed to input the adjusted alternating current and alternating-current potential differences, and output, on the basis of the inputted adjusted alternating current and alternating-current potential differences, an internal resistance of the laminated battery;
wherein:
the unit cell includes:
a separator; and
a membrane electrode assembly forming a power generation region; and
the separator includes:
a source connection point tab connected to a source line, the source line inputting and outputting the alternating current from the alternating current adjustment unit;
a sense connection point tab connected to a sense line, the sense line outputting a potential of the alternating current that is input and output through the source connection point tab; and

a separation portion configured to separate the sense connection point tab from a current path of the alternating current from the source connection point tab to the power generation region such that a first distance between the source connection point tab to which the source line is connected and the power generation region is shorter than a second distance between the sense connection point tab to which the sense line is connected and the power generation region.

2. The laminated battery system according to claim 1 , wherein:
the separation portion separates the sense connection point tab from the current path by an arrangement of a distant position of the sense connection point tab from the current path.

3. The laminated battery system according to claim 1 , wherein:
the separation portion separates the sense connection point tab from the current path by a formation of a high resistance region between the source connection point tab and the sense connection point tab.

4. The laminated battery system according to claim 1 , wherein:
the source connection point tab is connected with the sense connection point tab so as to form one tab.

5. The laminated battery system according to claim 3 , wherein:
the high resistance region is formed by forming a slit between the source connection point tab and the sense connection point tab.

6. The laminated battery system according to claim 3 , wherein:
the high resistance region is formed by arranging an insulator between the source connection point tab and the sense connection point tab.

7. A connection method of an internal resistance measuring device for measuring an internal resistance of a laminated battery, unit cells each including a membrane electrode assembly forming a power generation region being laminated in the laminated battery,
the internal resistance measuring device including a source line connected to a separator in an intermediate part of the laminated battery for inputting and outputting an alternating current and a sense line connected to the separator for outputting a potential of the alternating current input and output to and from the source line to the internal resistance measuring device,
the connection method comprising:
connecting the sense line at a position distant from a current path of the alternating current formed between a connecting portion of the source line and the power generation region,
wherein a first distance between a source connection point at which the source line is connected to the separator and the power generation region is shorter than a second distance between a sense connection point at which the sense line is connected to the separator and the power generation region.

8. A laminated battery system, comprising:
an alternating-current power supply unit connected to an internal resistance measurement object including at least a laminated battery, a unit cell being laminated in the laminated battery, and configured to output an alternating current to the internal resistance measurement object;
an alternating current adjustment unit programmed to input a positive-electrode side alternating-current and a negative-electrode side alternating-current, generate a command voltage based on the positive-electrode side alternating-current and the negative-electrode side alternating-current, and cause the alternating-current power supply unit to output, based on the generated command voltage, an adjusted alternating current such that a positive-electrode side alternating-current potential difference between a potential on a positive electrode side of the internal resistance measurement object and a potential of an intermediate part matches a negative-electrode side alternating-current potential difference between a potential on a negative-electrode side of the internal resistance measurement object and the potential of the intermediate part; and
a calculation unit programmed to input the adjusted alternating current and alternating-current potential differences, and output, on the basis of the inputted adjusted alternating current and alternating-current potential differences, an internal resistance of the laminated battery;
wherein:
the unit cell includes:
a separator; and
a membrane electrode assembly forming a power generation region; and
the separator includes:
a source connection point tab connected to a source line, the source line inputting and outputting the alternating current from the alternating current adjustment unit;
a sense connection point tab connected to a sense line, the sense line outputting a potential of the alternating current that is input and output through the source connection point tab;
wherein the source connection point tab to which the source line is connected and the sense connection point tab to which the sense line is connected are located at positions facing or diagonal to each other across the power generation region.

9. The laminated battery system according to claim 1 , wherein the source connection point tab to which the source line is connected and the sense connection point tab to which the sense line is connected are located on a same side of the separator.

Assignees

• Nissan Motor

Inventors

• Aoki Tetsuya
• Sakai Masanobu
• Sugimoto Kei

Classifications

• H01M8/04589

  of fuel cell stacks · CPC title

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M8/04649 Primary

  of fuel cell stacks · CPC title

• G01R31/389

  Measuring internal impedance, internal conductance or related variables · CPC title