Car Power Source Current Interrupt Device Vibration Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing car power source apparatuses face safety issues due to current interrupt devices being damaged by vehicle vibration, leading to unintended cut-off of current and disruption of motor function, especially in electric vehicles.
Innovation Solution
A car power source apparatus with a current interrupt device housed in each battery cell that deforms to separate and cut-off current when internal pressure exceeds a set pressure, featuring a deformable metal plate and insulating materials to prevent movement and maintain a compressed state, thus preventing vibration-induced disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection region of the current interrupt device is designed with strong connection strength, then the device can resist vibration better, but it will be unable to separate and cut-off current when internal pressure rises abnormally
Solution Approach 1:
The connection region is divided into two distinct parts: a first connection part connected to the electrode and a second connection part connected to the external circuit. These parts are separable under abnormal pressure conditions, allowing the current interrupt device to cut off current while maintaining vibration resistance through the overall strong connection structure.
Solution Approach 2:
The connection strength parameter is differentiated between the two connection parts. The first connection part has different strength characteristics than the second connection part, allowing one to fail first under abnormal pressure while the other maintains connection integrity during vibration. This parameter differentiation resolves the contradiction between strong connection and separable safety mechanism.
2Object-generated harmful factors
If the connection region is designed with weak connection strength, then it can separate easily to cut-off current, but it separates easily with vibration causing unintended current cut-off
Solution Approach 1:
By segmenting the connection region into two parts with different connection strengths and failure modes, the system achieves both easy separation for safety and stability during vibration. The first connection part is designed to separate under abnormal pressure while the second maintains stability, resolving the contradiction between separability and connection stability.
3Reliability
If a current interrupt device is housed in each battery cell to improve safety, then battery safety is improved, but the device can be damaged by vibration leading to unintended current cut-off
Solution Approach 1:
The current interrupt device's connection region is segmented into two parts with different strength characteristics. This segmentation allows the device to maintain strong overall connections that resist vibration while preserving the ability to separate and cut off current when needed for safety.
Solution Approach 2:
Different connection strength parameters are applied to the first and second connection parts. This parameter change allows the connection region to exhibit both vibration resistance and separability, resolving the contradiction between safety functionality and vibration durability.
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
The solution effectively prevents current interruption due to vehicle vibration, ensuring reliable battery safety and continuous motor function by maintaining the current interrupt device in a stationary state, even under abnormal internal pressure conditions.
Implementation Method 1
a current interrupt device housed in a case of each battery cell that deforms to separate a connection point and cut-off current when battery cell internal pressure becomes greater than a set pressure
Implementation Method 2
The battery block is held with pressure applied in a direction perpendicular to the opposing planar surfaces of the stack of battery cells between the pair of endplates
Data Source
AI summary
A case (20) of each battery cell (1) houses a current interrupt device (30) that cuts-off current when internal pressure exceeds a set pressure. The case has a rectangular outline with a pair of opposing planar surfaces (20A). An electrode unit (10), which is a stack of positive and negative electrode plates (10A) with intervening separators (10C), and the current interrupt device are disposed between the pair of opposing planar surfaces. A plurality of battery cells is stacked with opposing planar surfaces opposite each other to form a battery block (2). The power source apparatus has a pair of endplates (4) disposed at the ends of the battery block, the pair of endplates is connected by connecting components (5), and the pair of endplates holds the battery cells in the stacked configuration applying pressure in a direction perpendicular to the opposing planar surfaces.