Lead-acid battery

Patent metadata

Field	Value
Publication number	US-11367906-B2
Application number	US-201917049830-A
Country	US
Kind code	B2
Filing date	Apr 1, 2019
Priority date	May 23, 2018
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

A lead-acid battery provided with a negative electrode plate, a positive electrode plate, and an electrolyte solution. The negative electrode plate includes a negative current collector and a negative electrode material. When it is defined in a log differential pore volume distribution of the negative electrode material thata) a region having a pore size of 1 to 3 μm is a P region,b) a region having a pore size of 6 to 15 μm is a Q region,c) a maximum value of the log differential pore volume in the P region is P, andd) a maximum value of the log differential pore volume in the Q region is Q,after initial degradation, during use, or after 1220 cycles in a light-load life test in which charge and discharge of constant current discharge at 25 A for one minute and constant voltage charge at 2.47 V/cell and an upper limit current of 25 A for ten minutes are repeated at a test temperature of 75° C., the log differential pore volume distribution of the negative electrode material has a peak p corresponding to the maximum value P in the P region and a peak q corresponding to the maximum value Q in the Q region, and the maximum value P and the maximum value Q satisfy 0.25≤P/(P+Q)≤0.63.

First claim

The invention claimed is:

1. A lead-acid battery comprising:
a negative electrode plate;
a positive electrode plate; and
an electrolyte solution,
wherein
the negative electrode plate includes a negative current collector and a negative electrode material, and
when it is defined in a log differential pore volume distribution of the negative electrode material that
a) a region having a pore size of 1 to 3 μm is a P region,
b) a region having a pore size of 6 to 15 μm is a Q region,
c) a maximum value of the log differential pore volume in the P region is P, and
d) a maximum value of the log differential pore volume in the Q region is Q,
in a light-load life test in which charge and discharge of constant current discharge at 25 A for one minute and constant voltage charge at 2.47 V/cell and an upper limit current of 25 A for ten minutes are repeated at a test temperature of 75° C., the log differential pore volume distribution of the negative electrode material after 1220 cycles has a peak p corresponding to the maximum value P in the P region and a peak q corresponding to the maximum value Q in the Q region, and the maximum value P and the maximum value Q are configured to satisfy 0.25≤P/(P+Q)≤0.63.

2. The lead-acid battery according to claim 1 , wherein
0.7≤P/(P+Q) is satisfied before the light-load life test.

3. The lead-acid battery according to claim 1 , wherein the negative electrode material includes a first organic expander and a second organic expander different from the first organic expander.

4. The lead-acid battery according to claim 3 , wherein the first organic expander has a sulfur element content of 1000 μmol/g or less, and the second organic expander has a sulfur element content of 4000 μmol/g or more.

5. The lead-acid battery according to claim 4 , wherein the first organic expander is at least one selected from the group consisting of lignin, lignin sulfonic acid, and lignin sulfonic acid salt.

6. The lead-acid battery according to claim 4 , wherein
the second organic expander is a condensate of a compound having an aromatic ring with an aldehyde compound, and
the compound having the aromatic ring is at least one selected from the group consisting of a phenol compound, a biphenyl compound, and a naphthalene compound.

7. A lead-acid battery comprising:
a negative electrode plate;
a positive electrode plate; and
an electrolyte solution,
wherein
the negative electrode plate includes a negative current collector and a negative electrode material, and
when it is defined in a log differential pore volume distribution of the negative electrode material that
a) a region having a pore size of 1 to 3 μm is a P region,
b) a region having a pore size of 6 to 15 μm is a Q region,
c) a maximum value of the log differential pore volume in the P region is P, and
d) a maximum value of the log differential pore volume in the Q region is Q,
the log differential pore volume distribution of the negative electrode material during use has a peak p corresponding to the maximum value P in the P region and a peak q corresponding to the maximum value Q in the Q region, and the maximum value P and the maximum value Q satisfy 0.25≤P/(P+Q)≤0.63.

8. A lead-acid battery comprising:
a negative electrode plate;
a positive electrode plate; and
an electrolyte solution,
wherein
the negative electrode plate includes a negative current collector and a negative electrode material, and
when it is defined in a log differential pore volume distribution of the negative electrode material that
a) a region having a pore size of 1 to 3 μm is a P region,
b) a region having a pore size of 6 to 15 μm is a Q region,
c) a maximum value of the log differential pore volume in the P region is P, and
d) a maximum value of the log differential pore volume in the Q region is Q,
the log differential pore volume distribution of the negative electrode material after initial degradation has a peak p corresponding to the maximum value P in the P region and a peak q corresponding to the maximum value Q in the Q region, and the maximum value P and the maximum value Q satisfy 0.25≤P/(P+Q)≤0.63.

9. The lead-acid battery according to claim 1 , wherein the maximum value P and the maximum value Q satisfy 0.30≤P/(P+Q)≤0.63.

10. The lead-acid battery according to claim 1 , wherein the maximum value P and the maximum value Q satisfy 0.25≤P/(P+Q)≤0.60.

11. The lead-acid battery according to claim 1 , wherein the maximum value P and the maximum value Q satisfy 0.40≤P/(P+Q)≤0.63.

12. The lead-acid battery according to claim 1 , wherein the maximum value P and the maximum value Q satisfy 0.40≤P/(P+Q)≤0.60.

13. The lead-acid battery according to claim 1 , wherein
0.9≤P/(P+Q) is satisfied before the light-load life test.

14. The lead-acid battery according to claim 8 , wherein 0.7≤P/(P+Q) is satisfied before the initial degradation.

15. The lead-acid battery according to claim 8 , wherein 0.9≤P/(P+Q) is satisfied before the initial degradation.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Kagohashi Hiroki

Classifications

• H01M4/14

  Electrodes for lead-acid accumulators · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/627

  Expanders for lead-acid accumulators · CPC title

• H01M10/06 Primary

  Lead-acid accumulators (semi-lead accumulators H01M10/20) · CPC title

• H01M4/20 Primary

  of pasted electrodes · CPC title