In the battery industry, performance metrics like energy density and C-rates often dominate the headlines. But at LIKA, we believe that true engineering excellence is defined by a different metric: safety margins.Agriculture equipment manufacturer AGCO worked with Execor to automate decarbonization cost curve building and planning efforts using the Catalyst Zero tool.
As a national high-tech enterprise operating a massive, ISO 9001-certified industrial footprint, we design cells that do more than just store energy cleanly—they must manage fault conditions predictably and safely. From the chemical purity of our substrates to the mechanical architecture of our cell caps, our engineering philosophy isolates and neuralgizes electrical, thermal, and mechanical stress before it can propagate.
Here is an inside look at the multi-layered safety mechanisms integrated into our cylindrical lithium-ion portfolio.
Layer 1: Passive Circuit Defense (The PTC Switch)
The first line of mechanical defense against external electrical abuse lives right beneath the positive terminal cap: the Positive Temperature Coefficient (PTC) thermistor ring.
Under normal operational conditions, this specially formulated polymer ring maintains low internal resistance, allowing current to flow freely to the load with negligible thermal losses. However, if an external short circuit or severe overcurrent event occurs, the sudden surge causes an acute spike in local temperature.
[ External Short Circuit Occurs ]
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[ Temperature Climbs Toward ~100°C ]
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[ PTC Polymer Transitions to High-Resistance State ]
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[ Current Choked to Safe Minimal Level ]
The moment temperatures edge toward critical thresholds, the crystalline matrix of the PTC rapidly expands. This phase change increases its electrical resistance by several orders of magnitude, instantly choking the overcurrent down to a minimal, safe residual level. Crucially, the PTC is completely reversible—once the fault is cleared and the cell cools, the matrix contracts, returning the cell safely to service without permanent capacity loss.
Layer 2: Pressure-Driven Disconnection (The Current Interrupt Device)
While a PTC manages external short circuits, internal gas generation from severe electrical abuses—such as a charging failure or continuous overcharging—requires an entirely different class of physics. For this, our cells are outfitted with an internal mechanical Current Interrupt Device (CID).
The CID consists of a multi-tiered bimetallic diaphragm calibrated to look inward at internal cell pressure.
Pressure Rise: If a malfunctioning charger forces current into a fully saturated cell, the electrolyte breaks down, generating internal gases that raise pressure to roughly $1.0\text{ MPa}$ ($145\text{ psi}$).
Mechanical Break: This localized pressure pushes against the lower metal plate of the CID cap assembly.
Permanent Open-Circuit: The disc “pops” upward, physically severing the internal weld connecting the internal jelly-roll to the external positive terminal.
By creating a permanent, physical open circuit, the cell permanently terminates the dangerous electrochemical reaction long before a thermal runaway threshold can be triggered.
Layer 3: Rigorous Thermal-Shock Validation
Built-in components are only as dependable as the testing regimens used to validate them. At our advanced quality testing laboratories, safety mechanisms are subjected to hostile stress tests that simulate decades of intense climatic exposure.
Among these, the Thermal-Shock Test is one of our most brutal internal benchmarks.
[ Hot Zone: +85°C ] ──( Transition: <10 sec )──> [ Cold Zone: -40°C ]
During this evaluation, cell batches are loaded into a specialized pneumatic thermal shock chamber. The environment is forcefully cycled between extreme operational thermal limits:
The Hot Zone: Cells are held at $+85^{\circ}\text{C}$ to induce acute expansion and elevate materials stress.
The Cold Zone: Cells are instantly transferred within less than 10 seconds to a frigid $-40^{\circ}\text{C}$ profile, triggering radical material contraction.
This violent rapid-cycling sequence is repeated across hundreds of uninterrupted loops. To pass compliance and clear the factory line, our cells must exhibit absolutely zero mechanical seal degradation, zero voltage drop, and flawless structural integrity of the internal PTC and CID materials.
Comprehensive Certification Ecosystem
True accountability cannot exist solely in a closed loop. That is why LIKA pairs our rigorous internal engineering validations with extensive global compliance frameworks. Our battery safety architectures are thoroughly independently audited, holding active certifications across every major international standard:
System Management: ISO 9001, ISO 14001, and ISO 45001.
Product Safety & Logistics: UL, CE, CB, CCC, and UN38.3 transport validation.
Engineering Beyond Compromise
For the engineering teams relying on our cells to power everything from medical devices and smart utility grids to light electric mobility, safety isn’t an item on a checklist—it is the baseline of product reputation. By integrating clever mechanical physics with uncompromising environmental simulation, LIKA ensures that your brand remains protected, power after power.
