Canning Thin Li-Ion Cells

March 18, 2002
The construction of Hitachi Maxell's 2.8-mm Li-ion cell can varies from the method typically used in Li-ion cells. A special can forming technique produces a very shallow can (picture a very small shoebox with the lid removed), into which the wound

The construction of Hitachi Maxell's 2.8-mm Li-ion cell can varies from the method typically used in Li-ion cells. A special can forming technique produces a very shallow can (picture a very small shoebox with the lid removed), into which the wound prismatic cell is placed. Then, the lid is placed over the can and sealed with a laser weld that follows the device's footprint.

By this sealing process, a "rib" is created around the can's perimeter. This makes it easier to fit the canned cell into a battery pack, where it will probably go unless destined for an embedded application. The rib also provides a convenient space to put the cell protection module in, without affecting the overall size of the cell.

For traditional Li-ion cells, the cell winding is slid lengthwise into a preformed can and laser-welded just at the top, along the width and thickness axes of the cell. But that type of assembly becomes very difficult to perform with a can that's less than 3-mm thick.

Sponsored Recommendations

Board-Mount DC/DC Converters in Medical Applications

March 27, 2024
AC/DC or board-mount DC/DC converters provide power for medical devices. This article explains why isolation might be needed and which safety standards apply.

Use Rugged Multiband Antennas to Solve the Mobile Connectivity Challenge

March 27, 2024
Selecting and using antennas for mobile applications requires attention to electrical, mechanical, and environmental characteristics: TE modules can help.

Voltage- and Current-Mode Control for PWM Signal Generation in DC-to-DC Switching Regulators

March 27, 2024
Learn voltage- and current-mode control technique for PWM-signal generation in switching-voltage regulators and where each application is best suited.

Highly Integrated 20A Digital Power Module for High Current Applications

March 20, 2024
Renesas latest power module delivers the highest efficiency (up to 94% peak) and fast time-to-market solution in an extremely small footprint. The RRM12120 is ideal for space...

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!