Will excessive internal resistance of L1022 battery affect the performance
of L1022 battery?
Why is the internal resistance of L1022 battery too large? How internal
resistance affects the performance of L1022 battery Due to the rapid development
of technology, the scope and role of L1022 battery have long been self-evident,
but lithium battery accidents have always been a problem in daily life. The
troubles encountered by the editor are endless and sometimes disturb us. For
this reason, the editor has specially formulated an analysis and solution for
the excessive internal resistance of L1022 battery to provide convenience for
everyone.
Internal resistance is one of the important indicators for evaluating the
performance of L1022 battery. The internal resistance test of L1022 battery
includes AC internal resistance and DC internal resistance. For individual
cells, the evaluation is usually based on AC internal resistance, often referred
to as resistance internal resistance.
However, when using large lithium battery packs (such as the power supply
system of electric vehicles), it is impossible or inconvenient to directly test
the AC internal resistance due to the limitations of the test equipment, and the
characteristics of the battery pack are usually evaluated as DC internal
resistance. In practical applications, DC internal resistance is also used to
evaluate battery life, predict life, evaluate system SOC, output/input
functions, etc.
Analysis of the causes of excessive internal resistance of L1022
battery
Step 1
(1) The conductivity of the anode component is too low (the conductivity
between materials is very poor because the conductivity of lithium cobalt itself
is very low)
(2) Too much binder is used for the anode component (the binder is
usually a polymeric material with strong insulating properties)
(3) The negative electrode component has too much binder (the binder is
usually a polymeric material and has strong insulating properties)
(4) Uneven dispersion of ingredients
(5) The binder solvent is incomplete during synthesis (cannot be
completely dissolved in NMP and water)
(6) The density of the coating slurry surface is too large (large
capacity ion migration distance)
(7) The compression density of L1022 battery is too large and the rollers
are too compact. (Excessive rolling, damaging some active material
structures)
(8) The positive electrode lug is not welded correctly and has a weak
weld seam
(9) The welding or riveting of the lugs is not firm, and there is
actually welding and desoldering.
(10) The winding is not strong and the winding core is loose (the
distance between the positive and negative poles increases)
(11) Anode welding between anode lug and shell
(12) The welding of cathode and pole is not firm
Material
(1) The cathode material has high resistance (thermal conductivity such
as lithium iron phosphate)
(2) Influence of separator material (separator thickness, small porosity,
small pore size)
(3) Influence of lithium battery electrolyte materials (low conductivity,
high viscosity)
(4) Influence of PVDF cathode material. (large molecular weight or large
molecular weight)
(5) Influence of positive conductive materials. (Poor conductivity, high
resistance)
(6) Influence of anode and cathode tab materials (thin thickness, poor
conductivity, uneven thickness, poor material purity)
(7) The surface conductivity or oxidation of copper foil and aluminum
foil is poor
Three, the other side
(1) Deviation of lithium battery internal resistance tester
(2) Human operation
(3) Lithium battery usage environment
How does internal resistance affect lithium battery performance?
The ohmic internal resistance (R) of a battery is composed of the
electrode material, the electrolyte, the separator resistance, and the contact
resistance of some parts (some descriptions include membrane resistance). When a
certain current flows, the polarization potential can be calculated, that is,
E=IR (Europe).
Operationtimedoutafter30001millisecondswith0outof-1bytesreceived
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