Secondary battery and secondary battery module

• US 8,956,753 B2
• Filed: 02/08/2011
• Issued: 02/17/2015
• Est. Priority Date: 03/30/2010
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Original Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Inventors: Byun, Sang-Won, Ahn, Byung-Kyu
• Primary Examiner(s): Gilliam, Barbara
• Assistant Examiner(s): Arciero, Adam A
• Application Number:
  US12/929,678
• Publication Number:
  US 20110244309A1
• Time in Patent Office: 1,470 Days
• Field of Search: None
• US Class Current: 429/158
• CPC Class Codes: H01M 10/0422 Cells or battery with cylindrical casing
• CPC Class Codes: H01M 50/147 Lids or covers
• CPC Class Codes: H01M 50/516 by welding, soldering or brazing
• CPC Class Codes: H01M 50/522 Inorganic material
• CPC Class Codes: H01M 50/538 Connection of several leads or tabs of wound or folded electrode stacks
• CPC Class Codes: H01M 50/55 on the same side of the cell
• CPC Class Codes: H01M 50/553 Terminals adapted for prismatic, pouch or rectangular cells
• CPC Class Codes: H01M 50/567 by fixing means, e.g. screws, rivets or bolts
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A secondary battery and a secondary battery module, the secondary battery including an electrode assembly, the electrode assembly including a positive electrode, a negative electrode, and a separator therebetween; a case for accommodating the electrode assembly; a cap plate for sealing the case; and at least one terminal unit, the at least one terminal unit including an electrode rivet electrically connected to one of the electrodes of the electrode assembly and formed of a first metallic material, a rivet terminal formed of a second metallic material, the second metallic material being different from the first metallic material, and a clad unit between the electrode rivet and the rivet terminal.

Claims

1. A secondary battery, comprising:

an electrode assembly, the electrode assembly including a positive electrode, a negative electrode, and a separator therebetween;

a case for accommodating the electrode assembly;

a cap plate for sealing the case; and

at least one terminal unit, the at least one terminal unit including;

an electrode rivet electrically connected to one of the electrodes of the electrode assembly and formed of a first metallic material,

a rivet terminal at an exterior of the cap plate and including a hole in which the electrode rivet is inserted, the rivet terminal being formed of a second metallic material, the second metallic material being different from the first metallic material, and

a clad unit between the electrode rivet and the rivet terminal, wherein;

the clad unit is disposed in the hole and includes an outer layer surrounding an inner layer, the outer layer being in contact with an inner surface of the hole and being formed of the second metallic material, the inner layer being in contact with the electrode rivet and being formed of the first metallic material, and

the electrode rivet is engaged with the clad unit.

2. The secondary battery as claimed in claim 1, wherein the outer layer is welded to the rivet terminal.

3. The secondary battery as claimed in claim 1, wherein the electrode rivet is welded to the inner layer of the clad unit.

4. The secondary battery as claimed in claim 1, further comprising another terminal unit, the other terminal unit including another rivet terminal and another electrode rivet, wherein the other rivet terminal and the other electrode rivet are formed of a same metallic material.

5. The secondary battery as claimed in claim 4, wherein the one terminal unit has a polarity opposite to a polarity of the other terminal unit.

6. The secondary battery as claimed in claim 1, wherein the first metallic material includes copper and the second metallic material includes aluminum.

7. A secondary battery module comprising a plurality of secondary batteries, at least one of the secondary batteries comprising:

an electrode assembly, the electrode assembly including a positive electrode, a negative electrode, and a separator therebetween;

a case for accommodating the electrode assembly;

a cap plate for sealing the case; and

at least one terminal unit, the at least one terminal unit including;

an electrode rivet electrically connected to one of the electrodes of the electrode assembly and formed of a first metallic material,

a rivet terminal at an exterior of the cap plate and including a hole in which the electrode rivet is inserted, the rivet terminal being formed of a second metallic material, the second metallic material being different from the first metallic material, and

a clad unit between the electrode rivet and the rivet terminal, wherein;

the clad unit is disposed in the hole and includes an outer layer surrounding an inner layer, the outer layer being in contact with an inner surface of the hole and being formed of the second metallic material, the inner layer being in contact with the electrode rivet and being formed of the first metallic material, and

the electrode rivet is engaged with the clad unit.

8. The secondary battery module as claimed in claim 7, further comprising a bus bar coupled to the rivet terminal of the at least one secondary battery and to an adjacent secondary battery, the bus bar being formed of the first metallic material.