Technology

Battery Architecture

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Cylindical 21700 Cells
Electrical contacting spring with fuse
Hollow block for direct liquid cooling

State-of-the-art cylindrical cells 21700 according to the latest Lithium-Ion technology

Kreisel uses lithium-ion cells of the latest generation. Kreisel works exclusively with well-known companies that can produce the latest technology in terms of performance, safety, and quality. The 21700 format is establishing itself as the standard cylindrical cell format in which future developments in cell chemistry and new materials are incorporated.

Electrical contacting to adjacent module with integrated safety feature by one fuse per cell

The serially connected cell in the adjacent module is electrically contacted via a patented contact spring. The cells of a module are joined by plugging them together. Due to the clamping force of the multiple spring elements, a lifelong holding force ensures a permanently very low contact resistance. The connection technology guarantees the best electrical conductivity values. In addition, we have designed fuse geometries into the spring elements, so that if the fault currents are too high, which occur in very rare cases, the fuse is triggered and the defective cell is released from the cell compound. We call this USP “single cell fuse”.

Hollow moulded block for direct liquid cooling

The cells are surrounded by a non-conductive liquid. Thus the heat is dissipated very efficiently. The space surrounding the liquid is called Hollow-Block. The challenge in designing the Hollow-Block is to seal the cells in two areas around the circumference so that no leakage occurs over the lifetime of the block. Here, Kreisel has developed robust solutions, a combination of material, geometry and fluidic parameters. We have protected our know-how with several important patents. The Hollowblock combines further functions, such as the controlled guidance of the liquid to create equal thermal conditions at each cell. 

Battery Characteristics

BEST-IN-CLASS SAFETY

  • Highest safety in relation to energy density. 
  • Integrated features preventing propagation, even in the worst case of fire. 
  • Designed for meeting the highest safety standards in automotive, marine and stationary. 
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Maximum LIFETIME

  • Immersion cooling ensures that the cells operate in the ideal temperature range.  
  • Lowest temperature spread within the packs provides significant lifetime benefits.  
  • Superior lifetime under high loads in fast charging, high-performance and hybrid modes. 
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exceptional performance

  • Highest power (C-rates) for charging and discharging due to the patented immersion cooling.   
  • Proven in many applications on the road and racetrack. 
  • High energy density at package level due to smallest thermal management structure.  
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MODULAR DESIGN

  • The module structure allows the use of various cell types. 
  • For new applications (PHEV, BEV, mild), different module and stack variants can be generated flexibly and easily by new configurations.  
  • This enables cost-effective application development and fast time to market. 
  • The future-proof module design is adaptable to future cell generations of various suppliers. 
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COMPETITIVE COSTS

Simple patented module design uses limited parts with second source ability.
Proven automated production processes offer benefits from scalability, increasing throughput, and yield.

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