Disk-Shaped Protective Circuit Modules in Secondary Battery Grooves
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Solution Overview
Problem
Existing secondary battery designs face challenges in miniaturization while maintaining functionality, particularly in the integration of protective circuit modules with bare cells, leading to increased size and complexity.
Innovation Solution
A simplified and miniaturized protective circuit module is achieved by using disk-shaped modules connected to the electrode terminals of the bare cell via flexible printed circuit boards, with a mounting portion located in a groove between the terminal and the cell can, allowing for compact integration and protection against excessive internal pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional protective circuit module designs are used, then functionality is maintained, but battery size increases and miniaturization is hindered
Solution Approach 1:
The protective circuit module is merged with the electrode terminal structure. The first module is integrated with the first electrode terminal and the second module is integrated with the second electrode terminal, eliminating the need for separate mounting spaces and reducing overall battery volume while maintaining protective functionality.
Solution Approach 2:
The protective circuit modules are nested within the groove structure formed between the electrode terminal and the can. The groove provides a recessed space that accommodates the protective circuit modules, allowing them to be embedded rather than adding external volume to the battery assembly.
2Ease of manufacture
If protective circuit module is integrated into the battery, then functionality is maintained, but mounting space requirements increase
Solution Approach 1:
The groove structure is utilized to nest the protective circuit modules within the existing battery architecture. The groove is formed between the electrode terminal and the can, creating a recessed mounting area that eliminates the need for additional external mounting space while facilitating easy integration during manufacturing.
3Volume of moving object
If compact design is implemented, then battery size is reduced, but protection against internal pressure may be compromised
Solution Approach 1:
The groove structure serves a dual function: it provides a compact mounting space for the protective circuit modules while also acting as a structural feature that enhances protection against internal pressure. The recessed design allows the modules to be protected within the groove, maintaining reliability in a compact form.
Solution Approach 2:
The groove is strategically positioned and dimensioned to provide localized protection and mounting functionality. By concentrating the protective and mounting features in the groove region between the terminal and can, the design achieves compactness without compromising the protective function in critical areas.
Data Source
AI summary
A protective circuit module and a secondary battery including the same. The secondary battery includes: an electrode assembly, a can to house the electrode assembly, and a cap assembly to seal an opening of the can. The protective circuit module includes: a first module electrically connected to the cap assembly; a second module electrically connected to a closed end of the can; and a third module electrically connecting the first module and the second module. The first module includes a mounting portion that is disposed in a groove between the can and the cap assembly.