Battery Pack Temperature Element Current Bypass
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Solution Overview
Problem
Battery packs face damage during rapid charging or discharging due to heat generated by high currents flowing through temperature elements, which can lead to overheating and potential explosions.
Innovation Solution
The battery pack design includes a branching current flow path that directs a high current through a second plate with lower resistance, reducing the current flowing through the temperature elements, and using a second plate with higher thermal conductivity to manage heat effectively, thereby preventing damage and improving exothermic reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high current is used for rapid charging or discharging, then charging speed is improved, but temperature element is damaged due to heat generated
Solution Approach 1:
The current flow path is segmented into multiple parallel paths: one path through the temperature element and another path bypassing it. This segmentation allows the total current to be divided, with the temperature element carrying only a portion of the current, thereby reducing heat generation while maintaining rapid charging capability through the combined parallel paths
Solution Approach 2:
A bypass path is introduced as an intermediary current flow route that allows excess current to circumvent the temperature element. This intermediary path protects the temperature element from excessive current damage while still enabling the battery pack to handle high current for rapid charging, effectively mediating between the conflicting requirements
2Power
If temperature element carries high current, then rapid charge is achieved, but heat generated damages the temperature element
Solution Approach 1:
The single current path is divided into multiple parallel current paths, with the temperature element forming only one branch. This segmentation ensures that the total power handling capability is distributed across multiple paths, preventing excessive current concentration in the temperature element while maintaining overall high current capability for rapid charging
Solution Approach 2:
Different parts of the electrical connection structure have different functions: the temperature element path is optimized for monitoring with lower current capacity, while the bypass path is optimized for high current transport. This local differentiation allows each component to operate within its optimal current range, preventing heat damage to the temperature element while maintaining rapid charge capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the durability and safety of battery packs by minimizing temperature element damage during rapid charge/discharge cycles and improving heat management, ensuring reliable operation.
Implementation Method 1
the second plate, in which a relatively high current flows, may include a material having a lower resistance than the first plate
Implementation Method 2
The second metal may have higher thermal conductivity than the first metal
Implementation Method 3
The first plate and the second plate may be welded together
Data Source
AI summary
A battery pack includes: a plurality of unit cells arranged side by side in a first direction and each comprising a first terminal and a second terminal to improve the durability and safety of the battery pack; a protection circuit module disposed on the plurality of unit cells; and a temperature element unit disposed on the plurality of unit cells in the first direction and comprising a first temperature element, a second temperature element, a first plate connecting the first temperature element and the second temperature element, and a second plate having an end electrically connected to the protection circuit module and another end electrically connected to the first plate disposed between the first temperature element and the second temperature element.