Explosion pressure prediction system for medium- and large-size cell module, and method for predicting explosion pressure of medium- and large-size cell module

Patent metadata

Field	Value
Publication number	US-11959818-B2
Application number	US-201916967285-A
Country	US
Kind code	B2
Filing date	Oct 18, 2019
Priority date	Oct 25, 2018
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

A method for predicting the explosion pressure of a medium- and large-size cell module, according to the present invention, comprises the steps of: (S100) deriving a profile (SOC-temperature profile) of the generation temperature according to a state of charge (SOC) of a medium- and large-size cell module to be predicted; (S200) mounting a small cell inside an explosion pressure measurement device; (S300) overcharging the small cell until an explosion occurs while heating the small cell in the same manner as the SOC-temperature profile derived in step (S100); (S400) measuring the pressure during the explosion of the small cell; and (S500) converting the pressure during the explosion of the measured small cell into pressure of a medium- and large-size cell module.

First claim

The invention claimed is:

1. A method for predicting an explosion pressure of a medium-large cell module, the method comprising:
deriving a SOC-temperature profile of a generated temperature according to a charge amount (SOC) of the medium-large cell module (S 100 );
mounting a small cell inside an explosion pressure measuring device (S 200 );
heating the small cell in a same manner as the SOC-temperature profile and overcharging the small cell until the small cell is exploded (S 300 );
measuring a pressure when the small cell is exploded (S 400 ); and
converting the measured pressure of the small cell into an explosion pressure of the medium-large cell module (S 500 ).

2. The method of claim 1 , wherein in the converting the measured pressure (S 500 ), a pressure of the medium-large cell module is calculated by substituting the pressure measured at the explosion of the small cell with an equation,

P
md

=

P
s

×

C
ml

C
s

×

N

m
⁢
d

[
Equation
]

wherein in the above equation, P md is the explosion pressure of the medium-large cell module, P s is the pressure when the small cell is exploded, C ml is a capacity of the medium-large cell, C s is a capacity of the small cell, and N md is a number of cells of the medium-large cell module.

3. The method of claim 1 , wherein in the deriving the SOC-temperature profile (S 100 ), the SOC-temperature profile is different by capacities of the medium-large cell module.

4. The method of claim 1 , wherein the small cell has a capacity of 1.0 Ah or less.

5. The method of claim 1 , wherein the medium-large cell module includes one or more medium-large cells having a capacity of 20 Ah or more, which are electrically connected to each other.

6. The method of claim 1 , wherein in the overcharging the small cell (S 300 ), a charging current is applied and at the same time, a voltage of the small cell is measured concurrently.

7. The method of claim 1 , wherein the medium-large cell module is a power source of an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.

8. A system for predicting an explosion pressure of a medium-large cell module, the system comprising:
a chamber having a heating member disposed therein and including a mounting portion for mounting a small cell on the heating member;
a temperature control unit connected to the heating member to adjust a temperature of the heating member;
a charge/discharge unit electrically connected to the small cell;
a pressure measuring sensor located on one side of the chamber; and
a controller configured to control the temperature control unit, the charge/discharge unit, and the pressure measuring sensor;
wherein the controller controls the charge/discharge unit and the temperature control unit in order to heat the small cell in a same manner as a SOC-temperature profile of the medium-large cell module.

9. The system of claim 8 , wherein the heating member includes a first heating plate and a second heating plate, and
wherein a mounting portion is provided between the first heating plate and the second heating plate.

10. The system of claim 8 , wherein the chamber has a through portion formed at the one side, and is connected to the pressure measuring sensor through the through portion.

11. The system of claim 8 , wherein the chamber includes: a chamber body having a hollow structure with an open top; and a chamber cover coupled with the open top of the chamber body to seal the mounted small cell.

12. The system of claim 8 , further comprising an output unit configured to convert a pressure of the small cell measured by the pressure measuring sensor to a pressure of the medium-large cell module.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Park Ji Hye
• Kim Su Hyun

Classifications

• H02J7/82

  Control of state of charge [SOC] · CPC title

• G01L5/14 Primary

  for measuring the force of explosions; for measuring the energy of projectiles · CPC title

• G01G5/00

  Weighing apparatus wherein the balancing is effected by fluid action · CPC title

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H02J7/0048

  Electricity · mapped topic