Secondary battery, and secondary battery module and secondary battery pack comprising the same

Patent metadata

Field	Value
Publication number	US-9653724-B2
Application number	US-201414475743-A
Country	US
Kind code	B2
Filing date	Sep 3, 2014
Priority date	May 6, 2013
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

A secondary battery according to the present disclosure includes a cell assembly including a unit cell having at least one non-coated passage formed across an electrode plate, a temperature sensor including a temperature sensing unit located within the non-coated passage and a sensor lead extending from the temperature sensing unit, and a battery case to receive the cell assembly and which is sealed in a state that the sensor lead is drawn outside.
According to the present disclosure, a temperature change of the secondary battery may be measured quickly and correctly, and thus, the secondary battery may be controlled more minutely in response to a temperature change, and gas generated in the battery case during charging and discharging of the secondary battery may be easily discharged to a surrounding area of the cell assembly, thereby preventing a battery efficiency reduction phenomenon.

First claim

What is claimed is:

1. A secondary battery comprising:
a cell assembly including a unit cell that includes a plurality of electrode plates having at least one separation film interposed therebetween, wherein each electrode plate includes an electrode current collector having an electrode active material coated on at least one surface thereof, wherein at least one non-coated passage is formed across at least a first one of the electrode plates, the non-coated passage being defined by an area of the first electrode plate on which the electrode active material is not coated;
a temperature sensor including a temperature sensing unit located within the non-coated passage and a sensor lead extending from the temperature sensing unit; and
a battery case to receive the cell assembly and which is sealed in a state that the sensor lead is drawn outside.

2. The secondary battery according to claim 1 , wherein the cell assembly includes a plurality of unit cells, and the temperature sensing unit is located within the non-coated passage formed in a unit cell located at a center of the cell assembly among the plurality of unit cells.

3. The secondary battery according to claim 1 , wherein the unit cell comprises:
a cathode plate having a cathode tab;
an anode plate having an anode tab; and
a separation film interposed between the cathode plate and the anode plate.

4. The secondary battery according to claim 3 , wherein the non-coated passage is formed at a location corresponding to at least one of the cathode tab and the anode tab in a direction parallel to a direction in which the cathode tab and the anode tab extend.

5. The secondary battery according to claim 4 , wherein the temperature sensing unit is attached to a location near the cathode tab or the anode tab within the non-coated passage.

6. The secondary battery according to claim 1 , wherein the secondary battery further comprises a pair of electrode leads connected to the cell assembly and drawn out of the battery case.

7. The secondary battery according to claim 6 , wherein the sensor lead is drawn out of the battery case through an area other than an area where the electrode leads are drawn, among an edge area of the battery case.

8. The secondary battery according to claim 1 , wherein the temperature sensing unit is coated with an insulation film.

9. The secondary battery according to claim 8 , wherein the insulation film is made from a same material as the separation film.

10. The secondary battery according to claim 8 , wherein the insulation film is made from a polymer material having a higher softening point than the separation film.

11. The secondary battery according to claim 1 , wherein the temperature sensing unit is any one selected from a resistance thermometer detector (RTD), a thermocoupler, and a thermistor.

12. A secondary battery module comprising:
a secondary battery defined in claim 1 ; and
a control unit to stop operation of the secondary battery when an internal temperature of the secondary battery measured by the temperature sensor exceeds a threshold temperature.

13. A battery pack comprising:
at least two secondary battery modules defined in claim 12 .

14. A battery operating system comprising:
a battery pack defined in claim 13 ; and
a load which is supplied with power from the battery pack.

15. The battery operating system according to claim 14 , wherein the load is an electric driving means that operates by power supplied from the battery pack or a power inverter circuit.

Assignees

• Lg Chemical Ltd

Inventors

• Lim Seong-Yoon

Classifications

• H01M10/486 Primary

  for measuring temperature · CPC title

• H01M10/0431

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M50/183

  Sealing members · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/581 Primary

  in response to temperature · CPC title