What causes the electrode plate to break in use?
The reasons for the fracture of the electrode plate during use can be attributed to multiple aspects. The following is a specific analysis of these reasons:
1. Material factors
Insufficient material strength: The strength of the electrode plate material is an important factor affecting its fracture resistance. If the material itself is not strong enough, it is easy to break when subjected to external or internal stress.
Unstable material quality: The quality stability of the electrode plate material is also a key factor affecting its service life. If the material quality is unstable, there are defects or impurities, which will reduce the overall strength of the electrode plate and increase the risk of fracture.
2. Design factors
Unreasonable structural design: The structural design of the electrode plate should fully consider its stress conditions and use environment. If the structural design is unreasonable, such as too thin thickness, insufficient support, etc., the electrode plate will deform or break when subjected to stress.
Stress concentration: In the design of the electrode plate, if there is stress concentration, such as corners, around holes, etc., it will aggravate the stress level in these areas, thereby increasing the risk of fracture.
3. Usage factors
Overload use: If the electrode plate is subjected to a load exceeding its design bearing capacity during use, it will cause plastic deformation or fracture.
Frequent start and stop: Frequent start and stop will cause the electrode plate to be subjected to alternating stress, thereby accelerating its fatigue fracture process.
Changes in ambient temperature: Changes in ambient temperature will affect the performance of the electrode plate material, such as thermal expansion and contraction, which may cause stress differences inside the electrode plate, thereby causing fracture.
Corrosion and wear: The electrode plate may be affected by corrosion and wear during use, resulting in a decrease in material performance and an increased risk of fracture.
4. Specific case analysis
In lithium-ion batteries, the fracture of electrode plates (especially negative plates) is related to the expansion of the battery's negative electrode material and external pressure. Specifically, lithium-ion batteries generate stress during charging and discharging, and when lithium ions are embedded in the positive or negative electrode, the uneven concentration of lithium ions may cause stress. This stress will increase the tensile stress on the electrode surface, thereby causing crack expansion and degradation of the electrode material. In addition, graphite, as a commonly used negative electrode material, has a volume expansion rate of up to 10%, and even up to 300% volume changes can be observed in high-capacity anode materials such as silicon and tin. This volume change will cause cyclic stress of the electrode material during repeated charging and discharging, thereby causing the fracture of the pole piece.
5. Preventive measures
Optimize material selection: select electrode plate materials with high strength and stable quality.
Improve structural design: Rationally design the structure of the electrode plate to avoid stress concentration and overload.
Strengthen maintenance: Regularly check the use of the electrode plate, and promptly discover and deal with corrosion, wear and other problems.
Control environmental factors: Keep the temperature of the electrode plate use environment stable to avoid the impact of temperature changes on the performance of the electrode plate.
Rational use of batteries: Avoid overload and frequent start and stop to reduce the generation of internal stress in the battery.
In summary, there are many reasons for the fracture of the electrode plate during use, which need to be comprehensively considered from multiple aspects such as materials, design, and use, and take corresponding preventive measures.
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