Method for evaluating internal current density of battery cell
A current density and cell technology, applied in the field of battery testing, can solve the problems of high cost and difficult to truly reflect the distribution of electrochemical reaction current density of battery cells, achieve high universality, simple test and calculation methods, and improve energy effect of density
Pending Publication Date: 2022-05-27
SVOLT ENERGY TECHNOLOGY CO LTD
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Problems solved by technology
However, this method is only based on theoretical model predictions, and it is difficult to truly reflect the distribution of the electrochemical reaction current density inside the battery cell during actual use.
[0004] CN104374485A discloses a measuring device capable of synchronously measuring the internal heat flux density and current density distribution inside a fuel cell. The device can be installed inside the fuel cell as an independent component without special modification to the structure of the fuel cell, and the structure is simple. It is easy to make and has a wide range of applications, and can be adapted to fuel cell flow field plates with parallel flow channels, serpentine flow channels, staggered flow channels or other flow channel shapes, but the device is limited to use on fuel cells , and the cost of the device is relatively high
[0006] At present, there is no method that can quickly and accurately evaluate the change of the electrochemical reaction current density of lithium-ion batteries during actual use.
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Embodiment 1
[0049] This embodiment provides a method for evaluating the current density inside a battery cell, and the schematic flowchart of the method is as follows figure 1 As shown, the method includes the following steps:
[0050] (1) Disassemble the battery charged to 60% SOC in the glove box or drying room. When disassembling, pay attention to separating the positive and negative pole pieces to avoid accidents such as fire caused by short circuit;
[0051] (2) Take out the negative electrode sheet from the glove box or the drying room, expose the charged negative electrode sheet to the air for oxidation treatment, and pay attention to good ventilation during oxidation to avoid generating a large amount of smoke;
[0052] (3) After removing the overhang area of the fully oxidized negative electrode sheet (that is, the area where there are more positive electrode sheets in the length and width directions of the negative electrode sheet), use a punching machine according to figure...
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Abstract
The invention provides a method for evaluating the internal current density of a battery cell, and the method comprises the steps: firstly obtaining the lithium contents of different positions on a corresponding negative plate, and determining the quantity of electric charges transferred in an electrochemical reaction process based on the lithium contents of different positions on the corresponding negative plate; determining the electrochemical reaction current density on the corresponding negative plate based on the quantity of electric charges transferred in the electrochemical reaction process, and constructing an electrochemical reaction current density model of the whole battery cell based on the electrochemical reaction current density on the corresponding negative plate.
Description
technical field [0001] The invention belongs to the technical field of battery detection, and relates to a method for evaluating the internal current density of a battery cell. Background technique [0002] In recent years, with the transformation of global energy from fossil energy to renewable energy, lithium-ion batteries have developed rapidly due to their high energy density and long cycle life. At the same time, higher and more stringent requirements are also put forward for lithium-ion batteries, not only to achieve higher energy density but also to ensure the safety and stability of the battery, to achieve the rapid charging capability of lithium-ion batteries and to improve the cycle use of the battery. life. However, "you can't have both." Therefore, improving the energy density and fast charging capability of lithium-ion batteries will inevitably lead to a decline in the safety, stability and reusability of the battery to a certain extent. In order to achieve th...
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IPC IPC(8): G01N21/71G01N21/73
CPCG01N21/718G01N21/73Y02W30/84
Inventor 王娇娇于奥李树贤张要军何见超高飞杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD