Lithium ion battery

• US 8,088,509 B2
• Filed: 04/11/2006
• Issued: 01/03/2012
• Est. Priority Date: 11/08/2005
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited
• Inventors: Shen, Xi, Zhu, Jianhua, Lai, Qing, Han, Yili
• Primary Examiner(s): Ryan, Patrick
• Assistant Examiner(s): Lewis, Ben
• Application Number:
  US12/084,650
• Publication Number:
  US 20090142658A1
• Time in Patent Office: 2,093 Days
• Field of Search: 429/131, 429/133, 429/140, 429/153, 429/159, 429/161, 429/163, 429/164, 429/167, 429/170
• US Class Current: 429/159
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/617 for achieving uniformity or desired distribution of temperature
• CPC Class Codes: H01M 10/6554 Rods or plates
• CPC Class Codes: H01M 50/107 having curved cross-section, e.g. round or elliptic H01M50/103, H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/147 Lids or covers
• CPC Class Codes: H01M 50/169 by welding, brazing or soldering
• CPC Class Codes: H01M 50/503 characterised by the shape of the interconnectors
• CPC Class Codes: H01M 50/522 Inorganic material
• CPC Class Codes: H01M 50/591 Covers
• 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

Disclosed herein is a lithium ion battery comprising an electrode core, an electrolyte solution, a metal shell and an end cover assembly, said metal shell comprising an outer wall, an inner wall and a chamber, said electrode core and electrolyte solution being located in the chamber of the metal shell, and said electrode core being connected to the end cover assembly with a electrode terminal of the electrode core, wherein the number of said electrode core is more than one, and the multiple electrode cores are located in the chamber of the metal shell. The lithium ion battery according to the present invention possesses excellent disperse heat dispersion, high mechanical safety, and good high rate discharge performance. In addition, the battery according to the present invention solves the problems of the “wound battery” of the prior art that the electrode plate is long and difficult to wind, and the “stacked battery” of the prior art that the electrode plate is difficult to prepare and pile up by dividing the electrode core of high capacity into multiple electrode core of low capacity placed abreast in the metal shell, whereby simplifying the preparation thereof.

Claims

1. A lithium ion battery comprising:

an electrode core;

an electrolyte solution;

a metal shell; and

an end cover assembly,

said metal shell comprising an outer wall, an inner wall and a chamber,

said electrode core and electrolyte solution being located in the chamber of the metal shell, and

said electrode core being connected to the end cover assembly with an electrode terminal of the electrode core, wherein

the number of said electrode core is more than one, and the multiple electrode cores are located in the chamber of the metal shell,

the chamber comprises multiple intercommunicated inner cavities, each of which holds one electrode core,

multiple convex portions are provided on the inner wall of the metal shell and allow the electrolyte solution to pass therethrough, and

one inner cavity comprises the space formed by each two adjacent convex portions and the inner wall of the metal shell.

2. The battery according to claim 1, wherein the convex portions have the same height as the inner wall of the metal shell.

3. The battery according to claim 2, wherein the convex portions are symmetrically provided in the direction along the length of the metal shell, and the distance between two convex portions symmetrically provided is 50 to 90% of the maximum width of the inner cavity.

4. The battery according to claim 1, wherein multiple grooves are provided on the outer wall of the metal shell and the position of the groove corresponds to that of the convex portion.

5. The battery according to claim 1, wherein said end cover assembly comprises a cover, multiple electrode poles, an insulator and a metal connector, the multiple electrode poles are respectively connected to the electrode terminals of the electrode core and the metal connector, and the insulator is located between the cover and the electrode poles.

6. The battery according to claim 5, wherein the cover and the metal connector each has multiple holes through which the electrode poles are inserted, and the electrode poles further have screw threads on the end outer surfaces to be screwed with a nut.

7. The battery according to claim 1, wherein the metal shell is opened at both ends and the end cover assembly comprises:

a top cover assembly comprising an upper cover, multiple positive poles, an insulator, and a first metal connector, the multiple positive poles being connected to both the electrode terminal of the electrode core and the first metal connector, and the insulator being located between the upper cover and the positive pole, and

a bottom cover assembly comprising a lower cover, multiple negative poles, an insulator and a second metal connector, the multiple negative poles being connected to both the electrode terminal of the electrode core and the second metal connector, and the insulator being located between the lower cover and the negative pole.

8. The battery according to claim 7, wherein the cover and the metal connector each has multiple holes through which the electrode poles are inserted, and the electrode poles further have screw threads on the end outer surfaces to be screwed with a nut.