BOS battery X: lithium battery with heating right in the cell core
While browsing new tech for motorhomes, the BOS battery X caught my eye: a new lithium battery for motorhomes and caravans. It comes from BOS Balance of Storage Systems AG in southern Germany, which says it has been supplying Hymer in series production for eight years.
What sets it apart is the cells. Instead of prismatic or pouch cells, BOS uses cylindrical LiFePO4 cells. According to the manufacturer they are mechanically stable and vibration-resistant, and they keep their shape under heavy load and over the years of aging. Heat is also said to dissipate well, which matters for cycle life and lifespan.
For anyone travelling in winter, the frost charging feature is the interesting part. Before charging in the cold, the cells are heated through their welded contacts all the way to the core. This is supposed to work more evenly than batteries that are only heated from the outside. There is also a smart heating mode: the heating power adjusts to the available charging current, so the battery does not unnecessarily use up its own reserve when solar yield is low.
On safety, temperature sensors on the positive and negative terminals can detect abnormal heating at the connections and shut the battery off in time. It also has protection against overcurrent, short circuit, deep discharge and reverse polarity, and a flame-retardant housing rated IP67. Development and production are in Germany.
The article gives no capacity or price, and most of the claims come from the manufacturer, so they have to be confirmed in everyday use. Still, the approach of heating the core is an interesting one for anyone building a van that can handle winter.
Source: Reisemobil International
What sets it apart is the cells. Instead of prismatic or pouch cells, BOS uses cylindrical LiFePO4 cells. According to the manufacturer they are mechanically stable and vibration-resistant, and they keep their shape under heavy load and over the years of aging. Heat is also said to dissipate well, which matters for cycle life and lifespan.
For anyone travelling in winter, the frost charging feature is the interesting part. Before charging in the cold, the cells are heated through their welded contacts all the way to the core. This is supposed to work more evenly than batteries that are only heated from the outside. There is also a smart heating mode: the heating power adjusts to the available charging current, so the battery does not unnecessarily use up its own reserve when solar yield is low.
On safety, temperature sensors on the positive and negative terminals can detect abnormal heating at the connections and shut the battery off in time. It also has protection against overcurrent, short circuit, deep discharge and reverse polarity, and a flame-retardant housing rated IP67. Development and production are in Germany.
The article gives no capacity or price, and most of the claims come from the manufacturer, so they have to be confirmed in everyday use. Still, the approach of heating the core is an interesting one for anyone building a van that can handle winter.
Source: Reisemobil International
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