Vehicle Battery System with Parallel Switching Control
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Solution Overview
Problem
In vehicle battery systems with multiple storage batteries, concurrent charging can lead to a decrease in charging rates and increased deterioration of nickel-hydrogen batteries, particularly when power generation margins are low, causing over-discharge and accelerated degradation.
Innovation Solution
A vehicle battery system with a first storage battery, a second storage battery connected in parallel, an alternator, a charging state detection unit, a charging control unit, and a power generation margin determination unit that controls the switching state of an internal relay to manage power distribution and prevent excessive discharge of the second storage battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the first storage battery and the second storage battery are charged concurrently, then the electric power utilization is improved, but the charging rate of the second storage battery is lowered extremely
Solution Approach 1:
The control device changes the connection state parameter of the second storage battery based on detected charging rates and power generation margins. When the charging rate falls below a threshold and power generation margin is insufficient, the control device opens the internal switching unit to disconnect the second storage battery, thereby preventing further deterioration of charging rate while maintaining overall system efficiency.
2Quantity of substance
If the second storage battery is charged concurrently with the first storage battery, then the battery system capacity is increased, but the deterioration of the second storage battery accelerates
Solution Approach 1:
The control device continuously monitors the charging rate of the second storage battery and the power generation margin of the alternator. Based on this feedback, the control device dynamically adjusts the connection state of the second storage battery by controlling the internal switching unit, thereby preventing over-discharge and accelerating deterioration while maintaining the benefits of having a dual-battery system.
3Adaptability or versatility
If the internal switching unit is kept closed to allow concurrent charging, then the power distribution flexibility is improved, but the charging rate control precision is worsened
Solution Approach 1:
The system transitions from a static connection state to a dynamic one where the internal switching unit can be switched between closed and open states based on real-time conditions. This dynamic adjustment allows the system to maintain high power distribution flexibility during normal operation while achieving precise charging rate control when the second storage battery requires protection from over-discharge.
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 effectively suppresses the lowering of the charging rate of the second storage battery, thereby delaying deterioration and ensuring efficient power usage by controlling the switching state based on detected charging rates and power generation margins.
Implementation Method 1
an alternator which is connected to the first and second storage batteries and which is configured to be driven by the engine so as to generate electric power
Implementation Method 2
a first storage battery which is configured to supply electric power to a starter for starting up an engine; a second storage battery which is connected in parallel with the first storage battery
Data Source
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AI summary
A vehicle battery system includes: a first storage battery supplying electric power to a starter; a second storage battery connected in parallel with the first storage battery and including an internal switching unit switching a connection state with the first storage battery; an alternator connected to the first and second storage batteries and driven by an engine so as to generate electric power; a charging state detection unit detecting a charging state of the second storage battery: a charging control unit controlling a power generating state of the alternator and a switching state of the internal switching unit based on a detection result of the charging state detection unit; and a power generation margin determination unit determining whether there is a margin in the power generation of the alternator or not. When the charging state detection unit detects that a charging rate of the second storage battery is not higher than a minimum threshold, and the power generation margin determination unit determines that there is no margin in the power generation, the charging control unit controls the internal switching unit into an open state.