Battery Cell Assembly Layout for Current Balancing and Fault Isolation
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Solution Overview
Problem
Existing electrochemical cell assemblies face issues with oversized power connections leading to heating and difficulty in isolating faulty cells, especially in configurations where multiple cells are connected in parallel, which can cause external short circuits.
Innovation Solution
The assembly connects electrochemical elements in a series arrangement with balancing electrical connections that allow for easy isolation of faulty cells, using undersized connections to manage current flow and reduce heating, while maintaining electrical balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power connections are oversized to allow flow of sum of currents in parallel cells, then current carrying capacity is improved, but heating increases and space is wasted
Solution Approach 1:
The patent segments the electrical connections into two distinct types: power connections that carry only the current of a single cell (I), and balancing connections that carry balancing currents (ΔI). This segmentation allows each connection type to be optimally sized for its specific function, preventing the need to oversize power connections for the sum of all parallel cell currents.
Solution Approach 2:
The patent introduces balancing connections as intermediary elements that mediate between parallel cells. These balancing connections handle the balancing currents separately from the power connections, allowing the power connections to remain sized for single-cell current only, thus reducing heating while maintaining proper current distribution.
2Power
If power connections are oversized, then current carrying capacity is improved, but device size increases
Solution Approach 1:
The patent segments the electrical connections into two distinct types: power connections that carry only the current of a single cell (I), and balancing connections that carry balancing currents (ΔI). This segmentation allows each connection type to be optimally sized for its specific function, preventing the need to oversize power connections for the sum of all parallel cell currents.
3Reliability
If balancing connections are present to isolate faulty cells, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the fault isolation function into separate balancing connections that are distinct from the power connections. When a cell fails, the balancing connections can be opened to isolate the faulty cell while leaving the power connections intact and functional. This extraction simplifies the overall system by allowing independent handling of power transmission and fault isolation functions.
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 configuration reduces heating and simplifies fault isolation, ensuring reliable operation by dissociating power and balancing currents, allowing for efficient and compact design without overheating or chain reactions.
Implementation Method 1
the balancing electrical connections nevertheless ensure adequate electrical balancing within each block of electrochemical elements in parallel, by dissociating the power electrical currents passing through the power electrical connections and the balancing electrical currents passing through the balancing electrical connections
Implementation Method 2
each block of electrochemical elements of said row of the K columns being electrically connected with the block(s) of electrochemical elements of said i-th row of the adjacent electrochemical column(s) by first electrical power connections connecting in series respectively the M electrochemical elements
Data Source
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AI summary
The assembly comprises blocks (18) of electrochemical elements (12) electrically connected in series in the following manner: - the blocks (18) of the i-th row (16) of K columns (14) are electrically connected to each other in series, the blocks (18) of the i-th row forming an i-th group (22) of blocks (18) of electrochemical elements (12) of the i-th row; - for each i-th row, each block (18) of said row of columns (14) is electrically connected with the block(s) (18) of said i-th row of the adjacent electrochemical column(s) (14) by first electrical power connections (20) connecting in series respectively the M electrochemical elements (12) of said block (18) with respectively the M electrochemical elements (12) of the block(s) of said row of the adjacent electrochemical column(s) (14).