ELECTRODE ASSEMBLY AND MANUFACTURING METHOD OF SECONDARY BATTERY USING THE SAME

• US 20140272505A1
• Filed: 03/10/2014
• Published: 09/18/2014
• Est. Priority Date: 03/15/2013
• Status: Abandoned Application

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: KIM, Young-Min, YOON, Jang-Ho
• Application Number:
  US14/202,077
• Publication Number:
  US 20140272505A1
• Time in Patent Office: Days
• US Class Current: 429/94
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/426 Fluorocarbon polymers
• CPC Class Codes: H01M 50/434 Ceramics
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• CPC Class Codes: H01M 50/461 with adhesive layers between electrodes and separators
• 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
• CPC Class Codes: Y10T 29/49108 Electric battery cell making

Abstract

An electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator interposed between the positive and negative electrode plates, the separator having a polymer binder coating thereon, the positive electrode plate, the separator, and the negative electrode plate being sequentially stacked and wound in the shape of a jelly-roll, the jelly-roll being pressed through a heat press process.

Claims

1. An electrode assembly, comprising:

a positive electrode plate;

a negative electrode plate; and

a separator interposed between the positive and negative electrode plates, the separator having a polymer binder coating thereon, the positive electrode plate, the separator, and the negative electrode plate being sequentially stacked and wound in the shape of a jelly-roll, the jelly-roll being pressed through a heat press process.

2. The electrode assembly as claimed in claim 1, wherein the polymer binder includes polyvinylidene fluoride (PVdF).

3. The electrode assembly as claimed in claim 2, wherein a value obtained by dividing an alpha phase of the PVdF by a beta phase of the PVdF after the heat press process is about 1 to about 3.

4. The electrode assembly as claimed in claim 3, wherein the alpha phase is a value measured at a wave number of 796 cm⁻

1 or 976 cm<sup>−

1</sup>, and the beta phase is a value measured at a wave number of 841 cm<sup>−

1</sup>.

5. The electrode assembly as claimed in claim 1, wherein a ceramic layer is coated between the separator and the polymer binder.

6. The electrode assembly as claimed in claim 1, wherein the heat press process includes pressing the jelly-roll with a pressure of about 100 to about 500 kgf.

7. The electrode assembly as claimed in claim 1, wherein the heat press process is performed at a temperature of about 80 to about 130°

C.

8. The electrode assembly as claimed in claim 1, wherein the heat press process is performed for about 60 to about 150 seconds.

9. The electrode assembly as claimed in claim 1, wherein:

the positive electrode plate includes a positive electrode tab coupled to an end of a positive electrode collector, the positive electrode collector having a positive electrode active material layer thereon, and

the negative electrode plate includes a negative electrode tab coupled to an end of a negative electrode collector, the negative electrode collector having a negative electrode active material layer thereon.

10. A method of manufacturing a secondary battery, the method comprising:

forming a jelly-roll by sequentially stacking and winding a positive electrode plate, a separator having a polymer binder coating thereon, and a negative electrode plate; and

pressing the jelly-roll through a heat press process.

11. The method as claimed in claim 10, wherein the polymer binder includes polyvinylidene fluoride (PVdF).

12. The method as claimed in claim 11, wherein a value obtained by dividing an alpha phase of the PVdF by a beta phase of the PVdF after the pressing of the jelly-roll through the heat press process is about 1 to about 3.

13. The method as claimed in claim 12, wherein the alpha phase is a value measured at a wave number of 796 cm⁻

1 or 976 cm<sup>−

1</sup>, and the beta phase is a value measured at a wave number of 841 cm<sup>−

1</sup>.

14. The method as claimed in claim 10, wherein the heat press process includes pressing the jelly-roll with a pressure of about 100 to about 500 kgf.

15. The method as claimed in claim 10, wherein the heat press process is performed at a temperature of about 80 to about 130°

C.

16. The method as claimed in claim 10, wherein the heat press process is performed for about 60 to about 150 seconds.

17. The method as claimed in claim 10, wherein a ceramic layer is coated between the separator and the polymer binder.

18. The method as claimed in claim 10, further comprising inserting the jelly-roll into a prismatic battery case, injecting an electrolyte into the battery case, and sealing the battery case.