In chemical batteries, chemical energy can be directly transformed into
electrical energy. It is the result of the spontaneous oxidation and recovery of
chemical response from the battery. This response is performed on the two
electrodes. The negative active substance consists of a recovery agent that is
more negative and stable in electrolytes, such as zinc, cadmium, lead and other
vivid metals and hydrogen or hydrocarbons.
Positive active substances consist of composed of a positive potential and
stable oxidant in electrolytes, such as manganese dioxide, lead dioxide, nickel
oxide and other metal oxides, oxygen or air, halogen and salt Essence
Electrolytes are information with outstanding ionic conductivity, such as acid,
alkali, salt water solution, organic or inorganic non -aquatic solution, melting
salt or solid electrolyte. When the external circuit is disconnected, although
there is a potential difference (opening voltage) between the North and South
Pole, but there is no current, the chemical energy stored in the battery is not
converted to electrical energy.
When the external circuit is closed, the current flows through the external
circuit under the influence of the two electrode potential. At the same time,
because there is no free electron in the electrolyte, the transmission of charge
must be accompanied by the oxidation or recovery response of the North and South
Activated substances and the electrolyte interface, and the material relocation
of the response and the response products. The transfer of charge in the
electrolyte must also be completed by the relocation of ions. Therefore, the
normal charge transmission and material transmission process inside the battery
are necessary conditions to ensure normal output power. During charging, the
direction of the power transmission and mass transmission process inside the
battery is exactly the opposite of discharge; the electrode response must be
reversible to ensure the normal progress of the opposite direction and the power
transfer process.
Therefore, the electrode response is necessary to constitute a battery. G
is a free response to Gibbes (coke); F is Faraday frequency = 96500 library =
26.8 -An · hour; n is the number of battery reactions.
This is the fundamental thermodynamic relationship between the battery
electromotive momentum and the battery response, and it is also the fundamental
thermodynamic allocation of battery energy conversion power. In fact, when the
current flows through the electrode, the electrode potential must violate the
electrode potential of the thermodynamic balance. This phenomenon is called
polarization. The larger the current density (the current passed by the unit
electrode), the more severe the polarization.
The polarization phenomenon is one of the important reasons for the loss of
battery energy. Because the electrolyte data that constitutes a lithium -ion
battery are different, lithium -ion batteries are also divided into two types:
polymer lithium -ion battery and liquid lithium ion battery. The positive and
negative electrode data of the polymer lithium ion battery and liquid lithium
ion battery are the same, the working principle of the battery is similar, and
the electrolytes in the meantime are different. The polymer lithium battery is
light quality, strong energy storage capacity, good discharge capacity, and can
form various shapes, and the life is long. The electrolyte of the polymer
lithium battery is solid electrolyte. Compared with the liquid electrolyte of
liquid lithium -ion battery, the polymer lithium battery can form various shapes
to improve the battery ratio.
By February 2019, the fire accident at the South Korean Energy Storage
Power Station alone has now been high! The Ministry of Industry and Commerce and
Energy of South Korea urgently closed more than 300 energy storage battery
systems on the side of public business. Spontaneous combustion caused by
electric vehicle power lithium batteries, especially the Tesla Models
spontaneous combustion that recently generated in the underground garage in two
seconds, causing several cars to be burned on the side of the side to sound the
safety alarm clock: lithium battery energy storage The urgent needs of power
stations to establish a sound skill specification and demonstration system to
escort their sustainable development.
However, the energy storage system of the lithium battery energy storage
system, which is developed quickly with the scale effect of electric vehicles,
continues the characteristics of power lithium batteries in the inspection and
test specifications: it has severe lithium batteries, batteryManagementSystem
(BMS) and energy storage. PowerControlSystem (PCS) and new lithium battery
system test specifications, but lack the useful detection and evaluation system
for the lithium battery energy storage system that has been put into operation.
The current situation has made colleagues in the industry realize that security
is the primary bottleneck in the development of the energy storage industry.
Modern Grid has a security guarantee system that conducts timed operation and
detection of primary equipment. Lithium battery storage power stations are used
as emerging things outside the power grid. The need to formulate its entire life
cycle. Ensure the safe operation of modern power grids.
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