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There are two ways to increase capacity when the external dimensions are the same:

1. Increase the thickness of the grid, especially the thickness of the positive plate. Use this method to increase the amount of active substances and achieve the goal of increasing capacity.

2. Reduce the thickness of the electrode plate, improve the utilization rate of active substances, increase the number of electrode plates, and increase the electrode plate area, thereby achieving the goal of increasing capacity.

In contrast, adding a new thickness of the electrode plate without adding any operational steps makes it easier to implement. Reducing the thickness of the electrode plate is more conducive to the increase of capacity, but due to the increase in electrode plates and the spacing between positive and negative electrodes, it will inevitably lead to the thinning of the diaphragm, thereby increasing the risk of dendrite penetration in the diaphragm. The lithium-ion battery un 38.3 test also added workload for casting, coating, and assembly. Both methods of increasing capacity require increasing the density of acid to ensure sufficient acid participation in the reaction. Currently, the open circuit voltage of batteries made by these two methods is between 13.7V-14V, and 5A discharge can reach more than 140 minutes.

Increasing the density of acid has the following effects on the lifespan of batteries:

1. Intensify the corrosion of the electrode plate, especially the positive electrode plate.

2. Accelerate the softening of the positive electrode plate under deep discharge cycles.

3. With the increase of acid density, the solubility of sulfate decreases significantly, and the supersaturation of lead sulfate during discharge increases, making it easy to form coarse and hard lead sulfate, resulting in negative electrode sulfation. Especially during the normal use of electric vehicles, the battery is usually in a low state for more than 8 hours between morning and afternoon work, which is more likely to cause sulfation.

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