Battery and electric apparatus
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Solution Overview
Problem
Existing battery end plates face challenges in maintaining both strength and insulation, particularly during thermal runaway, leading to potential high-voltage short circuits due to insufficient coverage of insulating materials.
Innovation Solution
An insulating member with increased coverage is positioned on the end plate, ensuring it fully covers the top surface, enhancing insulation and preventing short circuits by maintaining adequate creepage distances and electrical gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the insulating member has smaller dimensions, then the battery volume is reduced, but the insulation coverage is insufficient leading to potential short circuits
Solution Approach 1:
The insulating member is designed with dimensions that exceed the minimum requirements (A≥0.9B) to provide excessive insulation coverage. This ensures that even if partial melting occurs during thermal runaway, sufficient insulation coverage remains to prevent short circuits, while still controlling the overall volume increase.
2Reliability
If the insulating member coverage is increased, then the insulation reliability is improved, but the battery volume increases
Solution Approach 1:
The patent optimizes the dimensional parameters of the insulating member, specifically setting its length A to be at least 0.9 times the length B of the end plate. This parameter relationship ensures adequate insulation coverage while minimizing unnecessary volume, achieving a balance between reliability and compactness.
3Object-affected harmful factors
If the insulating member melts during thermal runaway, then the insulation protection is lost, but with sufficient coverage the creepage distances remain adequate
Solution Approach 1:
The insulating member is designed with sufficient coverage area before thermal runaway occurs. This pre-designed excessive coverage acts as a cushion, ensuring that even if the insulating material melts during thermal runaway, there remains enough coverage to maintain adequate creepage distances and prevent short circuits.
Data Source
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AI summary
Embodiments of this application relate to the technical field of batteries, and in particular, to a battery (200) and an electric apparatus. The battery (200) includes: a plurality of battery cells (400) arranged in a first direction; an end plate (201) disposed at an end of the plurality of battery cells (400) in the first direction; and an insulating member (203) for connecting with the end plate (201), where the insulating member (203) is arranged on the top surface of the end plate (201) in a second direction, the second direction being perpendicular to the first direction; where the insulating member (203) has a maximum length A in a third direction, the end plate (201) has a maximum length B in the third direction, where A≥0.9B and the third direction is perpendicular to the first direction and the second direction. The battery (200) provided in the embodiments of this application can not only guarantee strength and insulation requirements on the end plate (201) in normal use of the battery (200), but also reduce risks of high voltage short circuit in thermal runaway of the battery (200).