Nondestructive
rechargeable battery
inspection systems

Overview

The world's first technology for nondestructive analysis of rechargeable battery failures

While the demand for lithium-ion storage batteries is on a rise because of their material properties, defects in such batteries can cause heat generation and ignition. The “Storage Battery Nondestructive Imaging Diagnostic System” developed by IGS can measure the current-density distribution inside storage batteries, thus enabling nondestructive failure analysis and quality control.

1Feature

Can directly ascertain the current-density distribution inside the battery

It can check the current-density distribution, which directly affects battery operation and life. This enables to pinpoint the exact cause of failure.

2Feature

No need to destroy the battery

The internal status of the current can be checked without destroying the battery. Therefore, the battery can be operated with the same quality as that prior to testing.

3Feature

Can identify minute short circuits in batteries that have been shipped as good batteries

Enables to assess minor short circuits, which are always present in good batteries, or slight spatial irregularities in current density before a short circuit occurs.

Issues

The problem with conventional rechargeable battery testing

Inability to perform accurate inspections has resulted in a large number of ignition accidents.

The method for testing rechargeable batteries in pre-shipment inspections tended to involve voltage drop (aging tests) after charging. However, explosion accidents frequently occurred in storage batteries that should have passed this test, and this has escalated as a social problem in the recent years.

Approach

Developing novel solutions

Technology

Using world’s first calculation theory created by IGS, we are able to visualize density distribution and short-circuit locations within storage batteries

The nondestructive storage battery imaging diagnostic system developed by IGS measures the magnetic field generated by an electric current flowing through the battery, using an ultra-sensitive magnetic sensor. This allows for identification of short-circuit locations that can directly lead to failures.

Because the system developed by IGS only  applies alternating current to the battery, the evaluation can be performed in a nondestructive manner.
There is no damage to the battery as a result of the evaluation.

Measurement using an ultra-sensitive electromagnetic sensor
method of examination

Automatically measures the magnetic field to reveal abnormalities within the battery

The battery is placed inside the nondestructive storage battery imaging diagnostic system, and the system automatically measures its magnetic field to calculate the current using software based on inverse analysis theory. The data are presented in an image form, and areas with irregular concentration of electricity are displayed in a different color. This enables identification of any areas that can be faulty.

Areas in which there is an irregular concentration of electricity are displayed in a different color
Innovation

Advantages of IGS nondestructive battery testing

The nondestructive storage battery imaging diagnosis system can visualize the path of the current and current-density distribution state inside the battery. It can also identify future design risk areas for batteries and ascertain the level of safety when diverting batteries for recycling.

Before

Conventional testing

Good/bad indicators

Self-discharge quantity

Observation of current density distribution

Impossible

Cell disassembly required?

Yes

After

IGS storage battery image diagnostic system

Good/bad indicators

Current density spatial distribution

Observation of current density distribution

Possible

Cell disassembly required?

No

Self-discharge quantity

Good/bad indicators

Current density spatial distribution

Impossible

Observation of current density distribution

Possible

Yes

Cell disassembly required?

No

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