You have been engaged in lithium battery industry for so many years, and the unit symbols you use may be wrong

A series of parameters related to batteries are written on many lithium battery products in life, such as energy density 150 wh/kg, battery capacity 1020 MAH, charging temperature 0 ℃ ~55 ℃, etc. you may know what these parameters mean and how to calculate them, but from the perspective of industry standards, the symbols of parameters are not written casually. If you accidentally write them wrong, they will appear to be very unprofessional, Today, I will show you how to write the common lithium battery unit symbols.
First of all, the power lithium battery often says kWh (kilowatt hour). KWh means the electric energy of the battery, K means thousands, w means watts, and H means hours. Seeing this, my friends may disdain it, saying that anyone who knows English knows it. Then the question comes, why are the three letters K, W and h, only w is uppercase, and the other two letters are lowercase?
The editor backhanded pulled out the general principles of gb3101-1993 on units of measure and symbols, and told everyone with authority.
K is the abbreviation of the word kilo, so it should be lowercase. H is the abbreviation of the word hour, and it should also be lowercase. Why not capitalize? According to the national standard, capital K means Kelvin, which is the unit of thermodynamic temperature, which is completely different from the lowercase K (thousand)! If h is capitalized, it means Heng [li], which is the unit of inductance. It doesn't mean the same as H (hour), so it can't be capitalized!
Since the K of kWh (kilowatt hour) is lowercase, why are the m of MWh (megawatt hour) capitalized? In fact, there is no reason for this, because m (trillion) is larger than K (thousand). So K (thousand) as the watershed, below it, such as m (milli) are lowercase, above it, such as m (trillion), G (Ji) are capitalized!
Screenshot of national standard
Anyway, why should w (watt) be capitalized? In fact, the lowercase w has no other meaning confused with it in the lithium battery industry. It is reasonable to say that lowercase W is also OK. However, w (watt) is the unit of power and has always been capitalized. And according to the national standard, if the unit name comes from the person's name, then the first letter of the symbol is capitalized!
In this way, MAH (milliampere hour) is also explained. A is ampere, is a person's name, to capitalize! M and H are nothing special. They should generally be lowercase.
In addition, when expressing the quantity value, a gap needs to be left between the symbol and the value, so strictly speaking, 3W cannot be written, but 3W should be written, and a space is required between 3 and W. If it means temperature, there should be more space. For example, the charging temperature of a lithium iron phosphate battery for forklift truck of China Energy Technology Co., Ltd. is 0 ℃ ~55 ℃. There is no doubt that the Celsius degree in this value needs to be capitalized. Not only that, there must be a gap between the value and the symbol!
After reading the above explanation, you should be able to understand the writing of these common unit symbols in the lithium battery industry. Finally, to sum up, H (hour), K (thousand) must be in lowercase, a (ampere), w (watt) must be in uppercase, m (trillion) must be in uppercase, m (milli) must be in lowercase, and there must be a gap between ° C and the previous value!
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