Voltage sensing member and battery module employed with the same

• US 7,875,378 B2
• Filed: 02/28/2007
• Issued: 01/25/2011
• Est. Priority Date: 03/06/2006
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Juyoung, Yang, Heekook, Yoon, Jongmoon
• Primary Examiner(s): Yuan; Dah-Wei D
• Assistant Examiner(s): Enin-Okut; Edu E
• Application Number:
  US12/224,526
• Publication Number:
  US 20090214936A1
• Time in Patent Office: 1,427 Days
• Field of Search: None
• US Class Current: 429/61
• CPC Class Codes: G01R 31/364 Battery terminal connectors with integrated measuring arrangements
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 50/204 Racks, modules or packs for multiple batteries or multiple cells
• CPC Class Codes: H01M 50/271 Lids or covers for the racks or secondary casings
• CPC Class Codes: H01M 50/296 characterised by terminals of battery packs terminals of batteries H01M50/543
• CPC Class Codes: H01M 50/505 comprising a single busbar
• CPC Class Codes: H01M 50/51 Connection only in series
• CPC Class Codes: H01M 50/569 Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals battery terminal connectors with integrated measuring arrangements G01R31/364
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Disclosed herein is a voltage sensing member constructed in a structure in which linear mounting parts are mounted to supporting parts coupled to the bottom of a battery module, conductive sensing parts are mounted on the mounting parts while the conductive sensing parts are in elastic contact with electrode terminals of battery cells, and the sensing parts are electrically connected to a battery management system (BMS). The voltage sensing member according to the present invention is manufactured by a simple assembly process without using a plurality of members for mechanical coupling and electrical connection. Consequently, the present invention has the effect of reducing the manufacturing costs of the voltage sensing member. Also, the voltage sensing member is maintained in elastic and stable contact when external impact or frequent vibration is applied to the voltage sensing member. Consequently, the present invention has the effect of performing stable voltage sensing operation. Furthermore, the present invention has the effect of manufacturing a middle- or large-sized battery pack having desired output and capacity using a battery module including the voltage sensing member as a unit body.

Claims

1. A voltage sensing member for sensing the voltage of battery cells constituting a battery module, the voltage sensing member comprising:

(a) a pair of supporting parts mounted to the bottom of the battery module at regions corresponding to electrode terminal connections of the battery cells, wherein the pair of supporting parts is a front supporting part and a rear supporting part;

(b) a connection part for electrically interconnecting the supporting parts;

(c) a plurality of linear mounting parts protruding upward while one end of each linear mounting part is fixed to the corresponding support part;

(d) a plurality of conductive sensing parts electrically connected to the corresponding supporting parts while the conductive sensing parts are mounted to the respective mounting parts, the conductive sensing parts being elastically connected to electrode terminals of the battery cells; and

(e) a connector mounted on the front supporting part or the rear supporting part for transmitting the sensed voltage of the battery cells to a battery management system (BMS).

2. The voltage sensing member according to claim 1, wherein the front supporting part and the rear supporting part are formed of a printed circuit board (PCB).

3. The voltage sensing member according to claim 1, wherein the mounting parts are formed of an elastic metal strip.

4. The voltage sensing member according to claim 1, wherein the sensing parts are formed of a conductive compression spring.

5. A battery module including a voltage sensing member according to claim 1.

6. The battery module according to claim 5, wherein the battery module comprises:

(a) a battery cell stack including a plurality of battery cells or unit modules connected in series with each other, the battery cells or unit modules being erected in the lateral direction;

(b) an upper case constructed in a structure to entirely surround one side end of the battery cell stack and to partially surround the upper and lower ends of the battery cell stack, the upper case being provided at the front part thereof with external input and output terminals;

(c) a lower case coupled with the upper case, the lower case being constructed in a structure to entirely surround the other side end of the battery cell stack and to partially surround the upper and lower ends of the battery cell stack, the lower case being provided at the front part thereof with bus bars for connecting electrode terminals of the battery cell stack to the external input and output terminals, the lower case being provided at the bottom thereof with the voltage sensing member;

(d) a front cover mounted to the front part of the lower case for protecting connections between the electrode terminals of the battery cells and the bus bars from the outside, the front cover being made of an insulative material; and

(e) a battery management system (BMS) mounted to the rear part of the lower case, while being connected to the voltage sensing member, for monitoring and controlling the operation of the battery module.

7. The battery module according to claim 6, wherein the voltage sensing member includes mounting parts and sensing parts mounted in spaces defined on the front and rear parts of the lower case, and supporting parts and a conduction part mounted to the bottom of the lower case.

8. The battery module according to claim 7, wherein the lower case is provided at the bottom thereof with a depression in which the connection part is inserted, and the depression is provided at the inside thereof with a plurality of protrusions which are alternately oriented to stably fix the connection part inserted in the depression.

9. The battery module according to claim 6, wherein the battery cell stack comprises a plurality of unit modules each including plate-shaped battery cells having electrode terminals formed at the upper and lower ends thereof, and

each unit module comprises two or more battery cells constructed in a stacked structure in which electrode terminals of the battery cells are connected in series with each other and the electrode terminal connections are bent such that the battery cells are stacked, and a pair of high-strength cell covers for surrounding the outer surfaces of the battery cells excluding the electrode terminals of the battery cells when the cell covers are coupled with each other.

10. The battery module according to claim 6, wherein the lower case is provided at the front and rear parts thereof with spaces in which supporting parts and sensing parts of the voltage sensing member are inserted, and the sensing parts are in elastic contact with the lower ends of the electrode terminals of the battery cells and/or series-connection bent regions (electrode terminal connections) of the electrode terminals of the battery cells.

11. The battery module according to claim 6, wherein the lower case is provided at the front part thereof with a pair of slits through which the outermost electrode terminals of the battery cell stack are inserted, and the outermost electrode terminals of the battery cell stack are inserted through the slits and then connected to the bus bars located at the front part of the lower case.

12. The battery .module according to claim 11, wherein the sensing parts of the voltage sensing member that are connected to the outermost electrode terminals are mounted on the supporting part such that downward-inclined ends of the sensing parts are rotated by a predetermined angle to face the insides of the outermost electrode terminals.

13. The battery module according to claim 7, further comprising:

insulative covers further disposed on the outer surfaces of the supporting parts mounted to the bottom of the lower case.

14. The battery module according to claim 6, wherein the lower case is provided at the rear part thereof with a protruding BMS receiving part in which the BMS is received.

15. A middle- or large-sized battery system having high output and large capacity, the battery system being manufactured using a battery module according to claim 5 as a unit body.

16. The battery system according to claim 15, wherein the battery system is used as a power source for electric vehicles or hybrid electric vehicles.