Joined
·
536 Posts
Hidden in a couple of threads there has been lots of discussion about Heat Pumps. I completely get the desire or even need for a HP in cold climates but in temperate climates like South West UK it's less easy to justify the cost.
One or two comments have suggested that one key function of the HP is to heat the battery as well as reducing energy used to heat the cabin. This might well be true but this doesn't mean the Non-HP models don't have battery heaters for this purpose. I found this article which is very interesting so thought I would share.
Q. The E-GMP is equipped with an electric heating system to maintain battery performance in winter. What kind of technology is this?
Choi Yong-Hwan | In the Li-ion batteries used in BEVs, cycles of ‘charging’ and ‘discharging’ are repeated as lithium ions move back and forth between the positive and negative electrodes through liquid electrolytes. The reduction in the battery output happens in winter because electrolytes in a liquid state harden at lower temperatures. Hardened electrolytes cause the movement of lithium ions to slow down, which in turn increases the internal resistance of the battery, resulting in a decrease in the charge/discharge performance. For this reason, charging the battery in winter takes longer than charging at room temperature.
To solve the problem, a heater technology that forcibly raises the temperature of the battery has been utilized in the E-GMP. By instantly raising the temperature of the battery, electrolytes can be kept at room temperature, which enables smoother charging of the battery even at low temperatures. When you experience an E-GMP-powered EV in winter, you will discover that any inconvenience caused by delayed battery charging time has been further eliminated.
Source: Interview with Researchers The Story of EV Technology on E-GMP - Hyundai Motor Group TECH
One or two comments have suggested that one key function of the HP is to heat the battery as well as reducing energy used to heat the cabin. This might well be true but this doesn't mean the Non-HP models don't have battery heaters for this purpose. I found this article which is very interesting so thought I would share.
Q. The E-GMP is equipped with an electric heating system to maintain battery performance in winter. What kind of technology is this?
Choi Yong-Hwan | In the Li-ion batteries used in BEVs, cycles of ‘charging’ and ‘discharging’ are repeated as lithium ions move back and forth between the positive and negative electrodes through liquid electrolytes. The reduction in the battery output happens in winter because electrolytes in a liquid state harden at lower temperatures. Hardened electrolytes cause the movement of lithium ions to slow down, which in turn increases the internal resistance of the battery, resulting in a decrease in the charge/discharge performance. For this reason, charging the battery in winter takes longer than charging at room temperature.
To solve the problem, a heater technology that forcibly raises the temperature of the battery has been utilized in the E-GMP. By instantly raising the temperature of the battery, electrolytes can be kept at room temperature, which enables smoother charging of the battery even at low temperatures. When you experience an E-GMP-powered EV in winter, you will discover that any inconvenience caused by delayed battery charging time has been further eliminated.
Source: Interview with Researchers The Story of EV Technology on E-GMP - Hyundai Motor Group TECH