Tooney
Well-Known Member
- Joined
- Aug 14, 2021
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- 2022 Taycan 4S
I know very little about the way EV batteries work. Below I have extracted some statements from the article, some of which imply that they apply to EV batteries in general, not just the Taycan.
Can anyone with knowledge of EV battery technology comment as to whether the statements below are true about EV batteries, or have any technical feasibility?
Not asking about the merits of the article as a whole, just these statements:
Can anyone with knowledge of EV battery technology comment as to whether the statements below are true about EV batteries, or have any technical feasibility?
Not asking about the merits of the article as a whole, just these statements:
- “The battery cells in a BEV are always charged in parallel to shorten the charging time, but this carries the risk that some cells will be charged faster than others. If one of the many cells in a BEV is charged faster than the rest, overcharging and overheating can occur, which can lead to vehicle fires, if, for instance, an additional air leak happens.”
- “For safety reasons, overheated battery cells are disabled and isolated from the battery pack, reducing battery capacity and thus the vehicle’s range.”
- “It is a well-known risk in the industry that when charging BEVs, an imbalance in the battery cells can lead to a sealed, encapsulated, and deactivated cell that can then overheat and cause battery damage and even fires if, for example, there is an additional leak in the battery box through which air can enter. Porsche’s 800V high-voltage architecture is more vulnerable in this regard than a low-voltage architecture such as Tesla’s 400V, or what other manufacturers use.”
- “Most of the BEV battery fire-related problems recorded in the past typically occurred in low-cost BEVs that lack sophisticated battery management systems or onboard chargers.”
- “The problem occurs when the batteries are charged at a low AC speed of up to 7.5 KW, a common use case for all charging, such as at home or on low-speed chargers, … “
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