Battery Pack Parallel Circuit for Equal Current Sharing
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Solution Overview
Problem
Prior battery pack connection schemes in parallel configurations fail to achieve current sharing among battery packs, affecting their usage and service life due to unequal current distribution.
Innovation Solution
A battery pack parallel circuit design that includes resistor pairs with specific resistance ratios to ensure equal current sharing, where the positive and negative resistors' equivalent resistances are adjusted based on the number of battery packs and their internal resistances, allowing current to flow from the positive terminal of the parallel battery packs and out from the farthest negative terminal on the diagonal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery packs are connected in parallel to solve cell fault impact, then system reliability is improved, but parallel current sharing cannot be achieved
Solution Approach 1:
The patent introduces balancing resistors as intermediary components connected between battery packs in parallel. These resistors act as mediators to redistribute current flow, enabling current sharing among battery packs while maintaining the parallel connection structure's reliability benefits.
Solution Approach 2:
The patent modifies the electrical parameters of the parallel connection by adding balancing resistors with specific resistance values. This changes the overall circuit characteristics to achieve current sharing, transforming the original unequal current distribution into balanced distribution across parallel battery packs.
2Device complexity
If simple parallel connection is used, then device complexity is reduced, but current distribution becomes unbalanced
Solution Approach 1:
Balancing resistors are introduced as intermediary components that enable current sharing without requiring complex control systems or active balancing circuits. This maintains structural simplicity while achieving precise current distribution control through passive components.
3Ease of manufacture
If parallel connection without balancing resistors is used, then ease of manufacture is improved, but service life is affected
Solution Approach 1:
The balancing resistors serve as simple intermediary components that can be easily integrated into the parallel connection structure during manufacturing. Despite adding minimal complexity, they significantly extend battery service life by preventing over-current conditions and ensuring balanced operation across all parallel battery packs.
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
Enables parallel current sharing among battery packs, enhancing their usage and service life by adjusting impedance devices in the circuit to ensure balanced current distribution during charging and discharging.
Implementation Method 1
the battery module includes at least one resistor pair formed by a positive resistor and a negative resistor; the positive resistor has an equivalent resistance of a connection impedance between positive charge terminals of two adjacent battery packs, and the negative resistor has an equivalent resistance of a connection impedance between negative charge terminals of the two adjacent battery packs
Data Source
AI summary
A battery pack parallel circuit is connected to a charge/discharge apparatus. The circuit includes a battery module formed by multiple battery packs connected in parallel, and battery packs located at two ends of the battery module are a first end battery pack and a second end battery pack respectively. A positive terminal of the first end battery pack is configured as a positive terminal of the circuit and connected to a positive connection terminal of the charge/discharge apparatus. A negative terminal of the second end battery pack is configured as a negative terminal of the circuit and connected to a negative connection terminal of the charge/discharge apparatus. The connection mode between the battery pack parallel circuit and the charge/discharge apparatus is modified to enable the current to flow in/out from the positive terminal of the parallel battery packs and flow out/in from the farthest negative terminal on the diagonal.