Battery Pack Safety Mechanism for Equipotential Spark Suppression
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Solution Overview
Problem
Existing lithium-ion batteries in electric vehicles face safety concerns due to high voltage sparks during thermal runaway, which are difficult to manage and can lead to unpredictable damage and instability.
Innovation Solution
A battery pack with a safety protection mechanism that switches from an insulated state to an electrical connection state when anomalies occur, forming equipotential components to prevent high voltage sparks and stabilize the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery packs are connected in series to increase output voltage, then the output voltage is improved, but the risk of thermal runaway spreading between battery packs increases
Solution Approach 1:
The battery pack is divided into multiple battery modules, each independently enclosed by a heat insulation barrier. This segmentation isolates thermal runaway within individual modules, preventing propagation to other modules while maintaining high voltage through series connection of multiple modules.
Solution Approach 2:
A heat insulation barrier is introduced as an intermediary substance between adjacent battery packs/modules. This barrier layer physically blocks thermal transfer, serving as a mediator that allows electrical connection while preventing thermal runaway propagation.
2Reliability
If a heat insulation barrier is introduced between adjacent battery packs, then thermal runaway spreading is prevented, but the device complexity increases
Solution Approach 1:
The heat insulation barrier serves multiple functions simultaneously: it provides thermal insulation to prevent runaway propagation, acts as a physical barrier for safety, and maintains structural organization. This multi-functionality reduces the need for additional separate safety components, thereby limiting complexity increase.
3Quantity of substance
If the anode electrode potential is lower than -0.18V vs. Li/Li+, then higher energy density is achieved, but lithium plating occurs during charging
Solution Approach 1:
The anode electrode potential is adjusted to a specific range (-0.2V to 0V vs. Li/Li+) that balances energy density and lithium plating prevention. This parameter optimization allows the use of high-capacity anode materials while maintaining safe charging behavior through controlled electrochemical potential.
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
The mechanism effectively reduces the risk of high voltage sparks by creating equipotential components, ensuring timely transition to a stable and controllable state, enhancing safety and reducing structural complexity.
Implementation Method 1
a first insulating layer, which prevents harmful substances generated by the first battery pack from affecting the second battery pack
Implementation Method 2
a second insulating layer, which prevents harmful substances generated by the second battery pack from affecting the first battery pack
Implementation Method 3
a support plate, which improves the strength of the battery module
Data Source
Figure 1~2
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AI summary
Embodiments of this application provide a battery pack, a safety control method therefor, and an electric apparatus. The battery pack (200) includes: a box assembly (201); a plurality of battery cells (100) disposed in the box assembly (201); and a safety protection mechanism (1) disposed in the box assembly (201) and having a first state and a second state. When the safety protection mechanism (1) is in the first state, the plurality of battery cells (100) are insulated from the box assembly (201). The safety protection mechanism (1) is in the second state when a preset trigger condition is met, and when the safety protection mechanism (1) is in the second state, at least some of the battery cells (100) are electrically connected to the box assembly (201).