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HEAT SINK FOR AN ELECTROCHEMICAL CELL AND METHOD FOR CONNECTING

[Category : - ELECTRONICS- MECHANICAL ENGINEERING- RENEWABLE ENERGY]
[Viewed 693 times]

The present invention relates to a heat sink (110) for an electrochemical cell (120). The heat sink (110) comprises a cell region (112) which is designed to be coupled to the electrochemical cell (120), a connecting region (116) which is designed to be connected mechanically and thermally to a cooling plate (130), and a fold region (114) which is arranged between the cell region (112) and the connecting region (116) and comprises a flexible fold of the heat sink (110).

Description and scenario of usage:
For optimum performance, Li-Ion cells require the most possible homogeneous cooling with small temperature differences. For this cooling of Li-ion cells, good heat conduction between the Li-ion cell and the cooling device, which consists of the cooling plate connected to the Li-ion cell and a central cooling plate, must be ensured.

Solved problem with the invention:
When assembling Li-ion cells including the connected cooling plates, the tolerance compensation for the connection to the central cooling plate is decisive for minimum costs and optimum quality, since the manufacturing tolerances of the individual components and thermal expansions have a negative impact on the production process in terms of quality and costs in the worst case. Nevertheless, the cooling plate should offer a very good thermal connection to the cooling plate, which can be solved either by frictional or material connection or in combination.

Advantages and USP with the invention:
With the present design of the cooling plate, a decoupling between the mechanical connection of the cooling plate with the cooling plate to compensate for unfavourable tolerances during assembly and at the same time very good thermal contacting can be achieved via a defined rebate area.


Financial information

The patent family comprises the following alive granted patents: EP2474061B1, CN102498601B, JP5560335B2
There were no oppositions against any of the family members. All fees are paid. The patent family was cited 10 times in total.

A compelling customer need and purchase criteria for electric vehicles is a sufficient range in daily operation. Due to the strongly decreasing performance of Li-Ion cells at high temperatures without sufficient cooling, this range decreases significantly. Furthermore, the Li-Ion cells age over-proportionately at high temperatures, i.e. the life span and capacity decrease. This circumstance has to be avoided in view of the already expensive and thus price-driving cells. In practice, the power (or charging process) is significantly reduced to protect the cells in the event of overtemperatures. This disadvantage can be compensated by efficient Li-ion cooling in battery-powered electric vehicles.
China's Ministry of Industry and Information Technology (MIIT) has published new national safety standards in the field of electromobility which will come into force on January 1, 2021. For example, it must take at least five minutes for a car battery in China to catch fire after a defect, in which a passenger can get to safety. A low-cost, weight-optimized battery cooling system plays a key role here, as it offers customers significant advantages in terms of range on the one hand, and manufacturers a unique selling proposition that differentiates from the competition on the other.
The invention perfectly meets the current trend of electric vehicle power supply and increasing battery efficiency at low cost. The patent family described was created as part of Behr GmbH & Co KG ‘s R&D work. Behr is a big German car supplier. The patents listed here originate from the field of Li-Ion cells, their low-cost, weight-optimized, modular design, cooling, connection/assembly. The area of thermal management and energy storage was one of the core projects there. This invention addresses key functions such as electrical contacting, thermal contacting and cooling at module level via uniformly defined module interfaces results in significant advantages in the very fast and simple exchangeability.
The acquisition of Behr by Mahle (another big car supplier) also resulted in the abandonment of Behr's original strategy of investing in battery cell production (pouch cells, see arrester patents) and in battery production as a whole (see patent family 1). The patent families described here fall within this period of Behr's original strategy.
Some of the patents from this area were transferred to one of the inventors involved (Prof. Dr. Herrmann) and are now for sale or licensing. For all the inventions described, prototypes or pre-series products were available that demonstrated the technical and economic feasibility.
The sale of the patent portfolio takes place against a bid – a detailed value calculation of each patent family member is available and may be provided on request.
There is no minimum bid even though the patent family was valued to a big sized 6 digit USD value.












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