# US 8,771,854 B2 · Secondary battery

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- Number: US 8,771,854 B2
- Document ID: US8771854B2
- Status: Granted
- Kind: B2
- Application number: 13/137,460
- Filed: 2011-08-17
- Published: 2012-07-19
- Granted: 2014-07-08
- Earliest claimed: 2011-01-14
- Assignees: Samsung SDI Co., Ltd.; Robert Bosch GmbH
- Applicants: Minhyung Guen; Dukjung Kim
- Inventors: Minhyung Guen; Dukjung Kim
- Web page: https://patentgrep.com/patent/US8771854B2

## CPC

- H01M 50/578: in response to pressure
- H01M 50/30: Arrangements for facilitating escape of gases
- H01M 50/561: {Hollow metallic terminals, e.g. terminal bushings}
- H01M 50/562: characterised by the material
- H01M 50/566: by welding, soldering or brazing
- H01M 50/567: by fixing means, e.g. screws, rivets or bolts
- H01M 50/581: in response to temperature
- H01M 50/55: on the same side of the cell
- H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells
- H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

Provided is a secondary battery including an electrode assembly, a case accommodating the electrode assembly, a cap assembly, and an electrode terminal electrically connected to the electrode assembly. The cap assembly includes a cap plate disposed over an upper opening of the case. The electrode terminal protrudes outwardly from a terminal hole of the cap plate. The electrode terminal includes a collecting terminal extending through the terminal hole of the cap plate, a terminal plate coupled with the collecting terminal, and a coupling terminal coupled with the terminal plate. The cap plate includes a short-circuit hole therein. The short-circuit hole is at a position corresponding to a position of the coupling terminal. A short-circuit member covers the short-circuit hole.

## Claims

### Claim 1

A secondary battery, comprising:
an electrode assembly;
a case accommodating the electrode assembly;
a cap assembly, the cap assembly including a cap plate disposed over an upper opening of the case; and
an electrode terminal electrically connected to the electrode assembly and protruding outwardly from a terminal hole of the cap plate, the electrode terminal including a collecting terminal extending through the terminal hole of the cap plate, a terminal plate coupled with the collecting terminal, and a coupling terminal coupled with the terminal plate; wherein:
the cap plate includes a short-circuit hole therein, the short-circuit hole being at a position corresponding to a position of the coupling terminal,
and a short-circuit member covers the short-circuit hole.

### Claim 2 (depends on 1)

The secondary battery as claimed in claim 1, wherein:
the terminal plate is disposed at an upper side of the cap plate and includes a first hole corresponding to the short-circuit hole, and
the coupling terminal is coupled with the first hole.

### Claim 3 (depends on 2)

The secondary battery as claimed in claim 2, wherein the terminal plate includes a lip protruding from a bottom surface thereof around a peripheral part of the first hole and toward the cap plate.

### Claim 4 (depends on 2)

The secondary battery as claimed in claim 2, wherein the coupling terminal is coupled with the first hole by riveting or welding.

### Claim 5 (depends on 1)

The secondary battery as claimed in claim 1, wherein the terminal plate is formed of aluminum or an aluminum alloy.

### Claim 6 (depends on 1)

The secondary battery as claimed in claim 1, wherein:
a protruding portion of the coupling terminal protrudes outwardly from the terminal plate, and
an outer surface of the protruding portion of the coupling terminal includes a screw thread thereon.

### Claim 7 (depends on 1)

The secondary battery as claimed in claim 1, further comprising an insulation member between the terminal plate and the cap plate.

### Claim 8 (depends on 7)

The secondary battery as claimed in claim 7, wherein the insulation member includes penetration holes corresponding to the terminal hole and the short-circuit hole of the cap plate.

### Claim 9 (depends on 1)

The secondary battery as claimed in claim 1, wherein the short-circuit member is a deformable plate including:
an edge part fixed to the cap plate; and
a round part extending from the edge part, the round part defining a convex side facing an interior of the secondary battery.

### Claim 10 (depends on 9)

The secondary battery as claimed in claim 9, wherein the round part is configured to deform and contact a bottom side of the terminal plate when an internal pressure of the secondary battery increases to a predetermined value or higher.

### Claim 11 (depends on 1)

The secondary battery as claimed in claim 1, wherein the collecting terminal includes:
a protrusion part passing through the terminal hole of the cap plate and protruding upwardly; and
a collecting part extending from the terminal hole of the cap plate below a bottom surface of the cap plate,
wherein the collecting part includes a lower extension extending through a penetration hole of a collecting plate, the collecting plate being connected to an electrode non-coating portion of the electrode assembly.

### Claim 12 (depends on 11)

The secondary battery as claimed in claim 11, wherein the protrusion part is disposed within a second hole in the terminal plate at a position corresponding to the position of the terminal hole of the cap plate.

### Claim 13 (depends on 11)

The secondary battery as claimed in claim 11, wherein:
the protrusion part is formed of aluminum or an aluminum alloy, and
the collecting part is formed of copper or a copper alloy.

### Claim 14 (depends on 11)

The secondary battery as claimed in claim 11, wherein the protrusion part and the collecting part are electrically and physically connected to each other.

### Claim 15 (depends on 14)

The secondary battery as claimed in claim 14, wherein the protrusion part and the collecting part are connected to each other by friction welding.

### Claim 16

A secondary battery comprising:
an electrode assembly;
a case accommodating the electrode assembly;
a cap assembly including a cap plate disposed over an upper opening of the case; and
an electrode terminal electrically connected with the electrode assembly and protruding outwardly from a terminal hole of the cap plate, the electrode terminal including:
a collecting terminal extending through the terminal hole of the cap plate,
a terminal plate coupled with the collecting terminal, and
a coupling terminal coupled with the terminal plate;
wherein the cap plate includes a short-circuit hole therein, the short-circuit hole being at a position corresponding to a position of the coupling terminal,
a short-circuit member covers the short-circuit hole, and
the short-circuit member is deformable and is configured to contact a bottom side of the coupling terminal in a deformed condition.

### Claim 17 (depends on 16)

The secondary battery as claimed in claim 16, wherein:
the terminal plate includes a third hole having a position corresponding to the position of the short-circuit hole of the cap plate, the third hole including an outwardly bending portion, and
a lower part of the coupling terminal corresponds in shape of the outwardly bending portion of the third hole, the lower part of the coupling terminal extending toward the cap plate.

### Claim 18 (depends on 16)

The secondary battery as claimed in claim 16, wherein:
a recess is formed in a bottom center part of the coupling terminal, and
a peripheral surface of the recess extends toward the cap plate.

### Claim 19 (depends on 16)

The secondary battery as claimed in claim 16, wherein the coupling terminal is coupled with the terminal plate by riveting or welding.