How is a safe lithium battery pack designed?

　　(1) All lithium battery pack failures are caused by short circuit failures. The conditions leading to short circuit fault include overcharge, overdischarge, overcurrent, and overtemperature, which are all caused by the internal structure of lithium battery. The positive and negative electrodes of the lithium battery pack shall be kept clean. The electrolyte and diaphragm of lithium battery shall be crystal when passing through. However, during the processing, the electrolyte and diaphragm of lithium battery are inevitably polluted by metal material dust, copper, aluminum, platinum and other debris

　　(2) When the lithium battery is not used correctly (overcharge, power loss, overcurrent) or in extreme natural environment (too high temperature), it will overheat, and at room temperature, the quiet state of slag will be eliminated, making it move in the indoor thermal space of lithium battery electrolyte. Secondly, if the debris is close to the diaphragm, the thermal debris will endanger the isolation of the diaphragm and cause a short circuit fault. So now we have polymer lithium batteries. Using colloidal electrolyte solution instead of liquid electrolyte solution can reduce the probability of short circuit fault

　　(3) During the whole battery charging process, the lithium ion battery will be generated at the positive pole level of the rechargeable battery. According to the lithium battery electrolyte, the resulting lithium ion battery will be raised to the negative pole level. As a negative electrode, carbon has a layered structure and many microporous plates, so the negative lithium ion battery is placed in the carbon microporous plates. The more lithium ion batteries are placed, the greater the charging capacity of the battery. Similarly, when the rechargeable battery is charged and discharged, the lithium ion battery placed in the carbon layer of the negative phase will also be removed and moved back to the positive phase again. The larger the capacity of the lithium-ion battery, the greater the return capacity;

　　(4) Principle of lithium battery pack: The lithium battery pack is a secondary battery (rechargeable battery). In its work, the key is to complete the storage and release of kinetic energy with the help of the lithium ion battery's cross and de embedding between the positive and negative electrodes

　　(5) Basic principle of composition of lithium iron phosphate battery pack.

　　1. Positive structure. Shape memory alloy 4 (lithium iron phosphate)+conductive agent (acetylene black)+adhesive (PVDF)+liquid collector (aluminum platinum).

　　2. Negative construction. High purity graphite+conductive agent (acetylene black)+adhesive (PVDF)+current collecting negative grade (copper poise).

　　3. The structure of lithium iron phosphate battery pack is stable during charging and discharging as lithium.

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