- Category of electric vehicle power battery
For all kinds of power batteries, it is impossible to assert which power battery will win the leading position in the future electric vehicle power supply market, but the development potential and Prospect of all kinds of power batteries can be prospected. Performance is an important factor affecting the market prospect of electric vehicle power batteries, and cost, service life and reliability are also important indicators affecting the position of power batteries in the market. The utilization level and potential of energy density of lead-acid batteries, nickel metal hydride batteries and lithium-ion batteries commonly used in electric vehicles. Although the performance index of lead-acid battery has no advantages, it will still occupy a certain market in the field of electric vehicle power supply due to its mature technology, low price and safe use. Nickel metal hydride batteries and lithium-ion batteries are two kinds of batteries that people place high hopes on. Both batteries will continue to develop in the future, and their competition in electric vehicles will become more and more fierce. Ni MH battery has low pollution and long service life. It is most used in commercial hybrid electric vehicles. A large number of electric vehicle application practices have proved the safety and reliability of Ni MH battery. Although the performance index is not as good as lithium-ion battery, Ni MH battery will still be one of the widely used power batteries in the 21st century. So far, lithium-ion battery is the most likely battery to realize commercial application in externally rechargeable hybrid electric vehicles. The United States, Japan and other automobile developed countries have paid more attention and investment to the research of lithium-ion batteries. Because lithium is the third lightest element after hydrogen and nitrogen, lithium has the lowest negative electromotive force, and the chemical reaction process of lithium-ion battery has little stress on the active material. These characteristics bring the outstanding advantages of high voltage, light weight, high energy density and high energy efficiency of lithium-ion batteries. Therefore, lithium-ion batteries have the most development potential among all kinds of power batteries. Learn more about lithium battery click here to open tycorun lithium battery.
In addition, there are many new power batteries in the process of research and development.
- Capacitive battery
(1) Raising questions
To fully meet the requirements of electric vehicles for the use of power batteries, people put forward the following ideas.
① Frequent high current impact has a significant adverse impact on the performance of the battery.
② If the super capacitor is connected in parallel at both ends of the battery, it can indeed buffer the impact of high current charge and discharge on the battery, so as to prolong the cycle life of the battery.
③ If the electrode material of supercapacitor and the electrode material of lithium-ion battery are cleverly combined to make them work in coordination, it will be equivalent to making each battery material particle under the protection of capacitor, which should prolong the cycle life of battery and improve the high current charge discharge power characteristics of battery. The following figure is a schematic diagram of this idea.
(2) Types of capacitive batteries
The formal name of super capacitor is electrochemical capacitor, also known as electric double layer capacitor (EDLC) Generally, capacitive batteries are divided into three types: capacitive lead-acid batteries, namely lead-acid batteries + EDLC; Capacitive Ni MH battery (also known as high-energy nickel carbon supercapacitor), i.e. Ni MH Battery + EDLC; Capacitive lithium ion battery, lithium ion battery + organic capacitor.
(3) Capacitive lithium ion battery
Capacitive lithium-ion battery combines the working principle of electric double-layer supercapacitor and lithium-ion battery. The device includes both the electric double-layer physical energy storage principle of super capacitor and the embedding and de embedding chemical energy storage principle of lithium-ion battery, that is, a capacitive lithium-ion battery is formed.
Key technologies of capacitive lithium-ion battery: electrode composition design, electrolyte composition design, working voltage matching, structure design and application technology matching with performance. Main performance indexes of capacitive lithium ion battery: energy density 60 ~ 120W · H / kg; Power density 1300 ~ 3000W / kg; Cycle life: 2000 ~ 5000 times; Charging time: 0.5 ~ 2H; The working voltage is 2.5 ~ 3.6V. The above five indicators can be designed according to the use situation.
Temperature range – 30 ~ 60 ℃. Good safety performance, environmental protection and no pollution.
Read more: what is a battery thermal management system?