Ice bucket challenge for energy storage lithium battery manufacturers! Low temperature battery capacity killer?
We can see the operating temperature of the products in the operating instructions of many digital devices, most of which are -10 ℃ to 40 ℃. It is easy to understand the high temperature limit. The energy storage lithium battery manufacturers will emit heat when charging and working, and there are potential safety hazards in high temperature environment. However, the low temperature setting is that the internal electrolyte of the energy storage lithium battery manufacturer has lower efficiency at low temperature, which will affect the use of users, and even make the battery invalid in severe low temperature.
If you have ever used mobile phones and other digital products or batteries in the winter of the north, you may have found that the performance of batteries becomes worse at low temperatures, and even electronic products cannot be turned on. Let's take a look at the performance of batteries in low temperature environment.
The batteries we use now are mainly lithium-ion batteries. Theoretically, the influence of temperature on different lithium-ion batteries is basically the same. In order to compare the impact of low temperature more intuitively, we use the mobile power supply which can quantify the discharge performance as an example for testing.
Ice bucket challenge for energy storage lithium battery manufacturers! Why is low temperature a killer of battery capacity?
1. Mobile power supply facing low temperature test
Considering the different batteries used in the mobile power supply, we also set up two kinds of common lithium-ion cell mobile power supply for data sampling, including 18650 cell and soft package lithium-ion cell (commonly known as "polymer cell").
2. Battery endurance in normal temperature environment
In order to make a reference for later comparison, we first test the discharge performance of the mobile power supply at room temperature, which is the data of the control group. The ambient temperature of the discharge in the control group is 30 ℃.
It should be noted that what we are comparing here is the performance of the same cell at different temperatures. There is no unified standard for the mobile power supply of different cells tested. Therefore, there is no comparability between the two types of cells. We will also present their performance separately.
3. Discharge curve of soft pack lithium ion cell at room temperature
It can be seen that the soft pack lithium-ion battery has stable discharge at room temperature of 30 ℃. The overall voltage is maintained at about 4.95v, and the reference output energy is 35.1 watt hours.
4. Discharge curve of 18650 cell at room temperature
The discharge fluctuation of 18650 cell is very small in room temperature, and the overall voltage is higher than 4.9v. The reference output energy is 29.6wh.
5. Mobile power supply for discharging at room temperature
It can be seen that both have good performance in normal temperature environment. Stable discharge in normal temperature environment can also provide good endurance guarantee. Of course, this is also the design and use standard of mobile power supply and battery. Then the next step is to test the discharge performance of battery in low temperature environment.
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