Electricity Supply System for EV Battery Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional in-series IGBT heating systems for electric vehicle batteries face challenges with excessive current, leading to potential battery life loss and component damage, especially as battery performance improves and resistance decreases, causing non-uniform discharge and voltage differences within battery packs.
Innovation Solution
An electricity supply system comprising a battery module with multiple in-series modules, a control module with an IGBT module, relay module, and relay control module, allowing for batch heating and voltage equilibrium by selectively connecting battery groups with relays and an IGBT module, using electromagnetic relays and single-chip microcomputers for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If in-series IGBT heating is used with improved battery performance, then heating efficiency is improved, but current becomes excessively large causing component damage
Solution Approach 1:
The battery pack is divided into multiple battery groups (first battery group, middle battery groups, last battery group) that can be independently connected to the IGBT module through relays. This segmentation allows the heating current to be distributed across multiple groups rather than passing through the entire battery pack in series, thereby reducing the current burden on individual components while maintaining effective heating.
Solution Approach 2:
Instead of heating the entire battery pack simultaneously, the system applies heating to selected battery groups based on their temperature requirements. The relay control module selectively connects only the battery groups that need heating to the IGBT module, avoiding unnecessary current flow through other groups and reducing overall system stress.
2Temperature
If in-series IGBT heating is used, then heating function is achieved, but non-uniform discharge and voltage difference occur among battery groups
Solution Approach 1:
The battery pack is segmented into multiple independently controllable groups, each with its own relay connection to the IGBT module. This allows selective heating of specific groups that require it, preventing unnecessary charge-discharge cycles in already warm groups and thereby maintaining voltage uniformity across the battery pack.
Solution Approach 2:
Different battery groups can receive heating treatment based on their local temperature requirements. The relay control module identifies which groups need heating and connects only those to the IGBT module, applying localized heating rather than uniform heating to the entire pack, thus preventing voltage imbalances.
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 system effectively limits the maximum current to a safe range (2500-3000 A), preventing damage and achieving voltage equilibrium between battery groups, thereby extending battery life and ensuring the integrity of electronic components.
Implementation Method 1
the battery pack is heated via a pulse current which is generated by an instant short circuit of the entire battery pack
Implementation Method 2
The relay module includes a plurality of relays, in which each in-series module is connected to the relay module
Data Source
AI summary
An electricity supply system comprises: a battery module, a control module, and a distribution box. The battery module includes at least two in-series modules, each comprising at least two battery groups connected in series. The control module is connected with the battery module and includes an IGBT module, a relay module, and a relay control module. The relay module includes a plurality of relays K. Each in-series module is connected to the relay module. The relay module is connected to the IGBT module. The relay control module is configured for controlling ON or OFF of each relay K so as to select an in-series module to work with the IGBT module. The distribution box is connected with the control module.