lithium battery 18650

　　lithium battery 18650 assembly and common problems, lithium battery assembly technology

　　lithium battery 18650 assembly and common problems, lithium battery assembly technology. my country's battery energy storage projects have entered an accelerated construction phase, with an annual growth rate of more than 70%. Lithium batteries will play a key role in this due to their fast response speed, high charging and swapping efficiency, high number of cycles, and rapid technology upgrades. . However, when we pack lithium battery 18650s, we often encounter various problems, which trouble us from time to time. In view of this, the editor will tell you about lithium battery 18650 assembly and common problems as well as lithium battery assembly technology.

　　lithium battery 18650 assembly and frequently asked questions

　　1. Lithium battery expansion

　　1. Lithium battery expands when charging: When charging, the lithium battery will naturally expand, but generally not more than 0.1mm. However, overcharging will cause the electrolyte to decompose, increase the internal pressure, and expand the lithium battery.

　　2. Expansion during cycling: When the battery is cycled, the thickness will increase with the number of cycles, but it will basically not increase after more than 50 cycles. Generally, the normal increase is 0.3~0.6mm, and the aluminum shell is more serious. This phenomenon belongs to Caused by normal battery reaction. However, if the thickness of the shell is increased or the internal materials are reduced, the expansion phenomenon can be appropriately reduced.

　　2. Battery explosion

　　1. Overcharge explosion: The protection circuit is out of control or the detection cabinet is out of control, causing the charging voltage to be greater than 5V, causing the electrolyte to decompose, causing a violent reaction inside the battery, the internal pressure of the battery to rise rapidly, and the battery to explode.

　　2. Overcurrent explosion: The protection circuit is out of control or the detection cabinet is out of control, causing the charging current to be too large and lithium ions have no time to embed, and lithium metal is formed on the surface of the pole piece, penetrating the diaphragm, and the positive and negative poles are directly short-circuited, causing an explosion.

　　Lithium battery assembly technology

　　Low temperature and high energy density 18650 3350mAh-40℃ 0.5C discharge capacity ≥60%

　　Charging temperature: 0~45℃ Discharge temperature: -40~+55℃ Specific energy: 240Wh/kg -40℃ Discharge capacity retention rate: 0.5C Discharge capacity ≥ 60%

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　　1. To use lithium battery 18650s with acceptable quality, qualified and stable suppliers are required to provide single cells with good performance. The single cells must undergo a series of safety tests and performance tests and be used after passing them.

　　2. The battery structure adopts a ventilation design, and a spacing of no less than 2mm should be maintained between two adjacent batteries. This structure requires the battery to be fixed with a plastic bracket.

　　3. Adopt the principle of giving priority to operational safety, that is, employees are not prone to short circuits or have better preventive measures when operating.

　　4. Different batches of batteries are made into typical finished products and subjected to life tests. When the lithium battery 18650 design specification experience is summarized, the finished battery products are subjected to cycle tests to obtain the actual cycle life.

　　5. Adopt the equipment principle, that is, use auxiliary equipment to complete the work without manual labor as much as possible, at least semi-automatically.

　　6. Verify the high and low temperature performance of the battery. The cells of different PACK lithium battery manufacturers are made into finished products and discharged at different rates under high and low temperatures to obtain actual discharge curves.

　　After reading the above lithium battery 18650 junction assembly and frequently asked questions, is it helpful to you? At present, due to the widespread use of lithium batteries, there are many lithium battery manufacturers, and there are also many corresponding lithium battery 18650 companies. The battery protection system can provide two safety protections for overcharge, overdischarge, and overcurrent. The failure of each protection If the rate is one in 10,000, two layers of protection can reduce the failure rate to one in 100,000,000.

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