# US 12,183,893 B2 · Secondary battery

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- Number: US 12,183,893 B2
- Document ID: US12183893B2
- Status: Granted
- Kind: B2
- Application number: 18/380,693
- Filed: 2023-10-17
- Published: 2024-02-08
- Granted: 2024-12-31
- Earliest claimed: 2019-02-18
- Assignees: Sanyo Electric Co., Ltd.
- Applicants: SANYO Electric Co., Ltd.
- Inventors: Shinji Toi; Taiki Nonaka
- Web page: https://patentgrep.com/patent/US12183893B2

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/668: {Composites of electroconductive material and synthetic resins}
- H01M 10/0413: {Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes}
- H01M 10/0468: {Compression means for stacks of electrodes and separators}
- H01M 50/528: Fixed electrical connections, i.e. not intended for disconnection
- H01M 50/54: Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
- H01M 50/627: Filling ports
- H01M 50/636: Closing or sealing filling ports, e.g. using lids
- H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence)
- H01M 50/463: Separators, membranes or diaphragms characterised by their shape
- H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A secondary battery includes a rectangular exterior body having an opening and containing a first electrode assembly and a second electrode assembly, a sealing plate sealing the opening, and a positive-electrode current collector. The sealing plate has an electrolytic solution introduction hole. The first electrode assembly includes a first insulating sheet on an outermost surface thereof adjacent to the second electrode assembly. The second electrode assembly includes a second insulating sheet on an outermost surface thereof adjacent to the first electrode assembly. A first tape is attached to both an outermost surface of a first positive-electrode tab group and the first insulating sheet. A second tape is attached to both an outermost surface of a second positive-electrode tab group and the second insulating sheet. At least one of the first tape and the second tape is located to face the electrolytic solution introduction hole.

## Claims

### Claim 1

A secondary battery comprising:
a first electrode assembly including a positive electrode plate and a negative electrode plate;
a second electrode assembly including a positive electrode plate and a negative electrode plate;
an exterior body having an opening and containing the first electrode assembly and the second electrode assembly;
a sealing plate sealing the opening;
a current collector that is closer to the sealing plate than are the first electrode assembly and the second electrode assembly; and
a terminal electrically connected to the current collector and attached to the sealing plate,
wherein the sealing plate has a longitudinal direction and a short direction,
wherein the sealing plate includes an electrolytic solution introduction hole,
wherein the first electrode assembly and the second electrode assembly are aligned in the short direction,
wherein the first electrode assembly includes a first insulating sheet on an outermost surface thereof adjacent to the second electrode assembly,
wherein the first electrode assembly includes a first electrode tab group at an end thereof adjacent to the sealing plate,
the first electrode tab group being electrically connected to the positive electrode plate or the negative electrode plate,
the second electrode tab group being electrically connected to the positive electrode plate or the negative electrode plate,
wherein the first electrode tab group and the second electrode tab group are connected to the current collector,
wherein a first tape is attached to both an outermost surface of the first electrode tab group and the first insulating sheet,
wherein the outermost surface of the first electrode tab group is located at one side of the first electrode tab group nearer the second electrode assembly than the other side of the first electrode tab group in an alignment direction in which the first electrode assembly and the second electrode assembly are aligned with each other,
wherein in the longitudinal direction, a dimension of the first sheet is larger than one of the first tab.

### Claim 2 (depends on 1)

The secondary battery according to claim 1,
wherein the second electrode assembly includes a second insulating sheet on an outermost surface thereof adjacent to the first electrode assembly,
wherein a second tape is attached to both an outermost surface of the second electrode tab group and the second insulating sheet,
wherein the outermost surface of the second electrode tab group is located at one side of the second electrode tab group nearer the first electrode assembly than the other side of the second electrode tab group in the alignment direction.

### Claim 3 (depends on 2)

The secondary battery according to claim 2,
wherein the first insulating sheet is a porous sheet, and
wherein the second insulating sheet is a porous sheet.

### Claim 4 (depends on 1)

The secondary battery according to claim 1,
wherein the first electrode assembly is a stacked electrode assembly including a plurality of the positive electrode plates and a plurality of the negative electrode plates, and
wherein the second electrode assembly is a stacked electrode assembly including a plurality of the positive electrode plates and a plurality of the negative electrode plates.

### Claim 5 (depends on 1)

The secondary battery according to claim 1, further comprising:
an insulating member disposed on a side of the sealing plate facing an inside of the secondary battery,
wherein the insulating member has an insulating member opening located to face the electrolytic solution introduction hole, and
wherein a tubular portion is formed around the insulating member opening.

### Claim 6 (depends on 1)

The secondary battery according to claim 1,
wherein the current collector has a current-collector through hole located to face the electrolytic solution introduction hole.

### Claim 7 (depends on 2)

The secondary battery according to claim 2,
wherein the second tape is located to face the electrolytic solution introduction hole, and includes a region which is located on the outermost surface of the second electrode tab group and overlaps the electrolytic solution introduction hole in the thickness direction of the sealing plate.

### Claim 8 (depends on 5)

The secondary battery according to claim 5,
wherein the insulating member includes an insulating member main portion that extends along an inner surface of the sealing plate,
wherein the tubular portion protrudes inward toward the first electrode assembly and the second electrode assembly away from the insulating member main portion.