Battery Module Bus Pattern with Varying Width for Current Balance
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Solution Overview
Problem
Existing battery modules face inefficiencies in charging and discharging due to variations in output voltage and current distribution among connected battery packs, particularly in high-power applications like electric vehicles, where uniform current distribution and control are crucial for maintaining performance and preventing rapid voltage drops.
Innovation Solution
A battery module design featuring a bus pattern with a main body and branching portions that connect multiple battery packs, ensuring uniform current flow and resistance across all paths, with a master pack controlling charging/discharging operations and incorporating fuse portions for safety, thereby maintaining balanced voltage and preventing overcurrent situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery packs are electrically connected to increase output voltage and current, then power consumption capability is improved, but uniform current distribution and voltage balance deteriorate
Solution Approach 1:
The bus pattern is designed with varying width along its length, creating different electrical resistance characteristics at different locations. The width is greatest at the input/output point and decreases toward the branching portions, ensuring that battery packs at different distances from the input/output point experience compensated resistance, thereby achieving uniform current distribution and voltage balance across all connected battery packs.
Solution Approach 2:
The electrical resistance parameter of the bus pattern is intentionally varied by changing its physical dimensions (width) at different positions. This parameter change compensates for the different path lengths from the input/output point to each battery pack contact point, ensuring that the total resistance along each current path is substantially equal, which maintains voltage balance and uniform current distribution.
2Power
If battery packs are connected in parallel to increase current capacity, then power consumption capability is improved, but rapid voltage drops and overcurrent conditions occur
Solution Approach 1:
The bus pattern incorporates varying width to create location-specific resistance characteristics. By making the width greatest at the input/output point and decreasing toward the branching portions, the design compensates for the different electrical path lengths, ensuring that each battery pack experiences substantially equal total resistance. This prevents rapid voltage drops and overcurrent conditions that would otherwise occur in parallel configurations.
Solution Approach 2:
The bus pattern design aims to create equipotential conditions across all battery pack connection points by compensating for path length differences through varying width. This ensures that voltage is distributed evenly across all parallel-connected battery packs, preventing voltage instability and overcurrent conditions.
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 charging/discharging efficiency by ensuring uniform current distribution and balanced voltage across battery packs, improving overall module performance and safety by preventing rapid voltage drops and overcurrent conditions.
Implementation Method 1
a bus pattern comprising a main body including an input/output point of a charging/discharging path and first through third branching portions that branch from the main body and extend to first through third contact points of the first through third battery packs, respectively
Data Source
AI summary
A battery module is disclosed. In one aspect, the battery module includes first through third battery packs electrically connected to one another. The battery module also includes a bus pattern. The bus pattern includes i) a main body including an input/output point of a charging/discharging path and ii) first through third branching portions that branch from the main body and extend to first through third contact points of the first through third battery packs, respectively. A first distance is defined as the distance between the input/output point and the first contact point, a second distance is defined as the distance between the input/output point and the second contact point and a third distance is defined as the distance between the input/output point and the third contact point. The first distance is less than the second distance, and the second distance is less than the third distance.