The difference between aluminum-shell square lithium battery and aluminum-plastic film soft pack square lithium battery. With the rise of automotive power batteries in recent years, the contradiction between the range of the car and the battery capacity is becoming more and more prominent, due to the simple structure of the square battery unlike cylindrical batteries with higher strength stainless steel as a shell and accessories such as explosion-proof safety valve, domestic manufacturers of lithium battery power more aluminum-cased square battery with high battery energy density is the main, the following to explain the aluminum-cased square lithium battery and aluminum-plastic film soft pack square lithium battery The difference between aluminum-shell square lithium battery and aluminum-plastic film soft pack square lithium battery.
The difference between aluminum-shell square lithium battery and aluminum-plastic film soft pack square lithium battery
1, square lithium battery is generally used metal aluminum as the battery shell, due to the soft aluminum material, the battery in the charging and discharging process and due to gas production and other reasons that lead to an increase in internal pressure, battery thickness changes, and in serious cases even lead to electrical expansion, the extreme case of battery explosion-proof valve open battery leakage caused by safety accidents, so the battery thickness of the relevant factors to analyze the problem, to improve the thickness of the battery performance is of great significance.
Soft pack lithium battery is a layer of polymer shell on the outer layer of liquid lithium-ion batteries, as the outer packaging of soft pack batteries are mostly aluminum plastic film, once the internal problems, soft pack batteries will bulge from the weakest part of the battery surface bulge open, the safety is relatively high.
2, aluminum shell square lithium battery using electrolyte is liquid, in low-temperature environment is easy to be frozen, the internal resistance of a large increase in the impact of battery discharge capacity, and even lithium precipitation will occur so that the battery in low-temperature environment is to go to work; aluminum-plastic film soft pack square lithium battery at low temperatures can be achieved in a variety of shapes, higher capacity and greater energy density, can meet the needs of more equipment applications.
3, aluminum plastic film soft pack square lithium battery quality, energy density is higher than the aluminum shell square lithium battery, the same volume of the battery aluminum plastic film soft pack square lithium battery is about 10%-20% lighter than the aluminum shell square lithium battery. In the current technical conditions aluminum-plastic film soft-clad square lithium battery plasticity than aluminum-shell square lithium battery, especially for hybrid models in the need to consider the layout and weight of the vehicle, aluminum-plastic film soft-clad square lithium battery advantage is more obvious.
4, manufacturing costs, aluminum-shell square lithium battery materials have been fully localized, and its battery material technology requirements are lower than the aluminum-plastic film soft-clad square lithium battery, the overall material cost is about 10% lower than the aluminum-plastic film soft-clad square lithium battery at the same capacity. Aluminum-shell square lithium battery finished product processing is relatively simple, Pack lithium battery pack reliable and cost advantage is obvious. In addition, the aluminum-shell square lithium battery package adopts laser sealing technology, which has a stronger seal and can effectively avoid the problems of aging and air leakage at the seal.
Advantages and disadvantages of aluminum-shell square lithium battery
Advantages: high reliability of aluminum-shell square lithium battery package; high energy efficiency of the system; relatively light weight and high energy density; relatively simple structure, relatively easy to expand the capacity, which is an important option to improve the energy density by increasing the capacity of a single unit; large capacity of a single unit, the system composition is relatively simple, making it possible to monitor the single unit one by one; another advantage of a simple system is relatively good stability.
Disadvantages: Since aluminum-shell square lithium battery can be customized according to the size of the product, there are thousands of models in the market, and precisely because there are so many models, it is difficult to unify the process; the level of production automation is not high, the variability of the single cell is large, and there is the problem that the system life is much lower than the life of the single cell in large-scale applications.
Advantages and disadvantages of aluminum-plastic film soft pack square lithium battery
Advantages: aluminum-plastic film soft pack square lithium battery deformation space, light weight, the proportion of inactive parts is small, the weight of soft pack battery is 40% lighter than the same capacity of steel-cased lithium battery, 20% lighter than aluminum-cased battery; the same size and specification compared to the larger capacity, soft pack battery capacity is 10-15% higher than the same size of steel-cased battery, 5-10% higher than aluminum-cased battery; low shell strength, the cycle process on the Low shell strength, low mechanical stress on the internal structure during cycling, which is beneficial to the cycle life; ample pole lug position, uniform heat distribution during charging and discharging.
Disadvantages: low shell strength, strong dependence on group formation technology; relatively low production efficiency of laminated sheets compared to winding production method.
In general, aluminum-shell square lithium battery and aluminum-plastic film soft pack square lithium battery have their own advantages and shortcomings, each battery has its own dominant field, such as aluminum-shell square lithium battery in more lithium iron phosphate, aluminum-plastic film soft pack square lithium battery in more ternary. With the introduction of the new subsidies for new energy vehicles, the system energy density of the battery has become an important assessment indicator.
Whether it is aluminum-shell square lithium battery or aluminum-plastic film soft pack square lithium battery, the reason for the rapid development of the current because they are good at their respective applications have been well applied. Domestic power battery manufacturers are predicting that the square will become the mainstream of power batteries, through continuous innovation in technology, the energy density of the whole vehicle battery continues to improve, the battery performance expressed more excellent.
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