Battery Module Case Structure for Swelling Insulation Clearance
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Solution Overview
Problem
In battery modules, the expansion of batteries due to repeated charging and discharging can lead to insufficient electrical insulation between the battery and the case, causing the side plane portion of the battery to come into contact with the case, which compromises insulation and requires frequent inspections.
Innovation Solution
The battery module design includes a curve restriction structure in the side plane portion of the case, such as notches or protruding portions, that prevent the side plane from sagging inward and contacting the battery, maintaining insulation even as the battery expands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the battery and case are designed to be separated at the side plane portion, then the battery can be accommodated easily, but the insulation between the battery and case cannot be sufficiently ensured when the battery expands
Solution Approach 1:
The side plane portion of the case is designed with a predetermined curvature (convex or concave) in advance, before battery expansion occurs. This preliminary geometric configuration creates a gap or spatial relationship that prevents the expanded battery from contacting the case, thereby maintaining insulation reliability without complicating the manufacturing process.
2Device complexity
If the side plane portion of the case is made flat and connected to the planar portion, then the structure is simple, but stress concentration causes the side plane portion to curve inward and contact the battery when the battery expands
Solution Approach 1:
Instead of making the entire case complex, only the side plane portion is given a specific curved shape, while other portions remain flat and simple. This localized geometric modification addresses the stress concentration and insulation issues without significantly increasing overall device complexity.
3Measurement precision
If insulation monitoring is performed frequently to detect battery expansion early, then insulation issues can be detected sooner, but the inspection time and cost increase
Solution Approach 1:
The curved side plane portion is designed in advance to prevent battery-case contact, effectively eliminating the need for frequent insulation monitoring. This preliminary structural measure ensures insulation reliability passively, reducing inspection frequency and associated time losses.
Data Source
AI summary
A battery module has a plate-like battery and a case in which the battery is contained. The case includes plane portions sandwiching planar portions of the battery, and a side-surface portion opposing a side surface of the battery and connected with the plane portions with a first side therebetween. The side surface portion of the case has a curving-regulating structure extending from a second side opposite the first side toward the first side.