Bipolar Battery Thickness Absorption Member
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Solution Overview
Problem
Conventional bipolar batteries face issues with thickness distortions due to defects in electrode materials, leading to reduced performance and manufacturing yield, as well as the risk of short circuits and liquid junctions between electrodes.
Innovation Solution
A bipolar battery design featuring sub battery elements with alternating collectors and a fibrous carbon accumulation thickness absorption member to absorb thickness changes, along with a solid-type electrolyte and a laminate film external member to prevent distortions and leaks, while maintaining ion exchange functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional bipolar batteries are manufactured without thickness absorption members, then the structure is simpler and manufacturing is easier, but thickness distortions occur due to defects in electrode materials leading to reduced performance and manufacturing yield
Solution Approach 1:
A thickness absorption member made of compressible material (foam or fibrous material) is introduced as an intermediary component between sub-battery elements. This mediator absorbs thickness distortions and prevents direct contact between electrodes, resolving the contradiction by adding a specific component to improve precision without significantly complicating the overall structure.
Solution Approach 2:
The patent changes the physical parameters of the battery structure by introducing a compressible material with specific properties (compression modulus, porosity) that can dynamically adjust to thickness variations. This parameter change allows the structure to accommodate defects while maintaining performance, balancing manufacturing precision with structural complexity.
2Reliability
If bipolar batteries use conventional sealing methods without accumulation thickness absorption members, then manufacturing is more straightforward, but short circuits and liquid junctions occur between electrodes
Solution Approach 1:
The thickness absorption member serves as an intermediary barrier between electrodes, preventing direct contact that would cause short circuits or liquid junctions. This mediator maintains electrode separation while accommodating thickness variations, improving reliability without requiring complex multi-layer sealing structures.
Solution Approach 2:
The compressible thickness absorption member provides beforehand cushioning by being positioned in advance between sub-battery elements. It pre-companies potential thickness distortions and prevents harmful contacts before they occur, enhancing reliability while keeping the structure relatively simple.
3Productivity
If thickness distortions are not absorbed in bipolar batteries, then the structure remains simple, but performance degradation occurs due to contact between electrodes
Solution Approach 1:
The thickness absorption member acts as a mediator that tolerates thickness variations in electrode materials without compromising performance. By absorbing these distortions, it prevents manufacturing defects and improves yield, while the simple implementation (using foam or fibrous material) minimizes the increase in structural complexity.
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 performance degradation by absorbing distortions, improving manufacturing yield and reliability, and preventing short circuits and liquid junctions, resulting in higher discharge capacity and lower resistance values compared to conventional designs.
Implementation Method 1
an accumulation thickness absorption member that is arranged between the sub battery elements, wherein the accumulation thickness absorption member is formed of a fibrous carbon material
Implementation Method 2
the accumulation thickness absorption member absorbs a difference in thickness of the seal layer, the positive electrode layer, and the negative electrode layer
Implementation Method 3
a conductor that performs ion exchange between a positive electrode layer formed on the one surface of the collector and the negative electrode layer formed on the other surface of the collector
Implementation Method 4
The sub battery may comprise a seal member that prevents the conductor from leaking between the collectors
Implementation Method 5
The battery may comprise an external member surrounding the multiple sub battery elements, wherein the internal pressure within the external member is less than an atmosphere pressure
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The disclosure is directed to a bipolar battery that is constructed to improve battery performance by reducing distortions within electrode material of the bipolar battery. The bipolar battery includes multiple battery elements that each include multiple unit batteries. Each unit battery contains a conductor having a positive electrode layer and a negative electrode layer. A collector is positioned between adjacent positive and negative electrode layers of adjacent unit batteries, and an accumulated thickness absorption member is used to separate collectors of adjacent battery elements. The bipolar battery may be used in a motor vehicle, such as an electric car.