Battery module detecting high temperature of battery cell and method for detecting high temperature of battery cell

Patent metadata

Field	Value
Publication number	US-2022011168-A1
Application number	US-202017294727-A
Country	US
Kind code	A1
Filing date	Jan 31, 2020
Priority date	Feb 13, 2019
Publication date	Jan 13, 2022
Grant date	—

Abstract

A battery module is composed of a plurality of battery cells according to an embodiment of the present invention and includes one positive output terminal formed by connecting the plurality of battery cells, one negative output terminal formed by connecting the plurality of battery cells, a field effect transistor (FET) provided on a current path between the positive output terminal and an external device, a temperature information measurer for measuring temperature information of the plurality of battery cells, and a protection integrated circuit (IC) chip for controlling the FET.

First claim

1 . A battery module composed of a plurality of battery cells, the battery module comprising:
one positive output terminal connected to the plurality of battery cells; one negative output terminal connected to the plurality of battery cells; a field effect transistor (FET) provided on a current path between the positive output terminal and an external device; a temperature information configured to measure temperature information of the plurality of battery cells; and
a protection integrated circuit (IC) chip configured to control the FET, wherein the protection IC chip comprises:
a temperature calculation module configured to calculate a temperature of each of the plurality of battery cells based on the temperature information received from the temperature information measurer;
a grouping module configured to generate a first temperature group of at least two adjacent battery cells among the plurality of battery cells;
an average temperature calculation unit configured to calculate an average temperature of the battery cells included in the first temperature group; and
a high temperature determination unit configured to determine whether a temperature of the battery module is above a predetermined temperature based on the calculated average temperature of the first temperature group.

2 . The battery module of claim 1 , wherein a first end of the temperature information measurer is connected to the negative output terminal,
wherein a second end of the temperature information measurer is connected to the temperature calculation module of the protection IC chip, and wherein the temperature information measurer includes a plurality of negative temperature coefficient (NTC) thermistors connected in parallel to each other.

3 . The battery module of claim 2 , wherein each of the plurality of NTC thermistors includes a temperature sensitive dielectric constant changing unit where a dielectric constant increases above a predetermined threshold temperature. and
wherein the temperature sensitive dielectric constant changing unit of each of the plurality of NTC thermistors directly contacts a surface of a respective battery cell among the plurality of battery cells.

4 . The battery module of claim 1 , wherein in response to detecting the temperature of the battery module above the predetermined temperature based on the calculated average temperature, the protection IC chip is configured to turn off the FET to block charging or discharging of the battery module.

5 . A battery module, comprising:
a plurality of battery cells; one positive output terminal connected to the plurality of battery cells; one negative output terminal connected to the plurality of battery cells; a field effect transistor (FET) provided on a current path between the positive output terminal and an external device; a temperature information measurer configured to measure temperature information of the plurality of battery cells; a protection integrated circuit (IC) chip configured to control the FET; and a plurality of thermal films, each thermal film surrounding a respective one of the plurality of battery cells, wherein the protection IC chip comprises:
a temperature calculation module configured to calculate a temperature of each of the plurality of battery cells based on the temperature information received from the temperature information measurer;
a grouping module configured to generate a first temperature group of at least two adjacent battery cells among the plurality of battery cells;
an average temperature calculation unit configured to calculate an average temperature of the battery cells included in the first temperature group; and
a high temperature determination unit configured to determine whether a temperature of the battery module is above a predetermined temperature based on the calculated average temperature of the first temperature group.

6 . The battery module of claim 5 , wherein a first end of the temperature information measurer is connected to the negative output terminal,
wherein a second end of the temperature information measurer is connected to the temperature calculation module of the protection IC chip, and wherein the temperature information measurer comprises a plurality of negative temperature coefficient (NTC) thermistors connected in parallel to each other.

7 . The battery module of claim 6 , wherein each of the plurality of NTC thermistors includes a temperature sensitive dielectric constant changing unit where a dielectric constant increases above a predetermined threshold temperature, and
wherein the temperature sensitive dielectric constant changing unit of each of the plurality of NTC thermistors directly contacts a respective one of the thermal films.

8 . The battery module of claim 5 , wherein in response to detecting the temperature of the battery module above the predetermined temperature based on the calculated average temperature, the protection IC chip is configured to turn turns off the FET to block charging or discharging of the battery module.

9 . A method for detecting whether there is a high temperature of a battery module, the method comprising:
an individual battery cell temperature measurement step of measuring a temperature of each of a plurality of battery cells constituting the battery module; a grouping step of generating a first temperature group of at least two adjacent battery cells among the plurality of battery cells; a group specific average temperature calculation step of calculating an average temperature of battery cells for the first temperature group; a high temperature determination step of determining whether a temperature of the battery module is above a predetermined temperature based on the calculated average temperature for the first temperature group; and a battery module charging/discharging blocking step of turning off a field effect transistor (FET) of the battery module and blocking charging or discharging of the battery module in response to determining that battery module is above the predetermined temperature in the high temperature determination step.

10 . The method of claim 9 , wherein the high temperature determination step determines that there is a normal state when the calculated average temperature is less than the predetermined temperature.

11 . A battery pack comprising a battery module according to claim 1 .

12 . An electronic device in which the battery module according to claim 1 is mounted.

13 . The battery module of claim 1 , wherein the grouping module is further configured to generate a second temperature group of at least two adjacent battery cells different from the battery cells of the first temperature group, and
wherein the average temperature calculation unit is further configured to calculate an average temperature of the battery cells in the second temperature group.

14 . The battery module of claim 13 , wherein the high temperature determination unit is configured to determine whether the temperature of the battery module is above the predetermined temperature based on the calculated average temperature of the first temperature group and the calculated average temperature of the second temperature group.

15 . The battery module of claim 5 , wherein the grouping module is further configured to generate a second temperature group of at least two adjacent battery cells different from the battery cells of the first temperature group, and
wherein the average temperature calculation unit is further configured to calculate an average temperature of the battery cells in the second temperature gr

Assignees

• Lg Chemical Ltd

Inventors

• Kim Kyung Jik
• Lee Jin Hyun
• Son Young Su

Classifications

• H02J7/977

  of the battery · CPC title

• H02J7/663

  using battery or load disconnect circuits (H02J9/002 takes precedence) · CPC title

• H02J7/65

  against overtemperature · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H01M2200/105

  NTC · CPC title