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PACK battery, including copper, nickel film, protective plate, packaging, output (including connector), barley paper, plastic stents and other auxiliary materials in these items through the parallel design composed of PACK lithium battery, and the battery engineers in the design of lithium battery PACK and after the first string or the first and after the string has been is the focus of the engineers to argue, so let's take a look at the battery on and analyze the advantages and disadvantages of before and after the string.
First, battery PACK series parallel design characteristics analysis.
1, battery PACK requires the battery to have a high degree of consistency (capacity, internal resistance, voltage, discharge curve, life).
2. The cycle life of the battery PACK is lower than the cycle life of the single battery.
3. Use under limited conditions (including charging, discharging current, charging mode, temperature, etc.)
4, lithium battery pack PACK molding battery voltage and capacity has been greatly improved, must be protected, charge equalization, temperature, voltage and over-current monitoring.
5, battery PACK must meet the design requirements of voltage, capacity requirements.
Two. The advantages and disadvantages of the battery PACK before and after the first string and the first string:
1, the battery PACK first and after string shortcomings:
Due to the difference of internal resistance and uneven heat dissipation, A and parallel will affect the cycle life of the battery after shunt.
2, battery PACK first and then string advantages:
A, single battery failure automatic withdrawal, in addition to capacity reduction, does not affect the use of parallel, parallel process is more stringent.
When the battery of a unit in B and parallel connection is short circuited, the current of the parallel circuit is very large, and the fuse protection technology is usually avoided.
3, the battery PACK first string after the first string and the advantages of analysis:
1, according to the whole battery capacity first series, such as the whole group capacity of 1/3, and finally parallel, reducing the large battery fault probability.
2, battery PACK first and after string first string, and for the whole battery consistency is very good help.
Three. The common characteristics of the battery PACK before and after the first string and after the first string:
1, require good battery consistency. Whether it's a flexible package or a cylindrical battery, multiple combinations are needed. If the consistency is poor and the battery capacity is affected, a small battery with the lowest capacity determines the capacity of the entire battery.
2. Require high current discharge performance, lithium battery PACK design first string and then first and then string well? Motor starting current is 3 times of the normal working current. High current discharge can improve the power performance of the motor.
3. Good heat dissipation for batteries. The number of batteries is large, the temperature rise of the battery inside the battery box is not easy to be dispersed, resulting in uneven temperature between the batteries, the discharge characteristics are different, resulting in long-term performance degradation of the battery.
4, high production process. The battery has to withstand the vibration impact of the bumpy road. High requirements for the production process, especially the spot welding process. After welding test to prevent weld, welding.
Four, battery PACK before and after the string and the first string after the combination of wiring requirements:
We usually do PACK battery in series and parallel to the harnesses also have certain requirements, mainly is the output current customers or docking ports, normal series parallel wire harness according to function can be classified into the power line, take the subway lines, network lines, signal lines, and like a 6.4V emergency lamp lithium batteries are in series and parallel at the same time use.
A, first and then the string power cord: power line refers to the electrical load for each 36V below the power supply positive and negative line. Power line line diameter is according to the conductor cross-sectional area and load flow matching relation table preliminarily determined the conductor cross-sectional area, see table; practical design, the cross-sectional area should be left margin, such as the load current is less than 5A, 1 - mm, the actual load of 5 - 9A, 1.5 - mm, and so kind of push, to ensure that due to aging or high temperature wire current carrying capacity.
B, in determining the conductor cross-sectional area should be considered when heating voltage drop and the wire, under the following conditions: a) considering the wire diameter increase wire long wire diameter can be enlarged; b) wire through a plurality of connectors connected to the electric appliance after transfer, considering the terminal voltage drop is obvious, when applicable wire diameter amplification.
3, after the first string and take the wire: wire line diameter
A, wire line for single conductor, wire line selection according to current.
B, rail connection requires good contact with chassis or body framework.
C, ground points polished without insulating layer.
Look at the site map, to learn more about the battery before and after the first string and the advantages and disadvantages of string analysis.