# Optimization of the Battery Pack Heat Dissipation Structure of a Battery-Type Loader
## 4 Results and Discussion of Single-Factor Analysis
### Analysis of the Effect of Deflector on the Heat Dissipation Characteristics of Battery Packs  
3.1 Analysis of the Effect of the Deflector Covering a Row of Battery Packs on the Heat Dissipation Characteristics of Battery Packs  
In Figure 14a, the red part is the deflector, which is denoted by 1 in Figure 14b. According to the above analysis of the heat dissipation characteristics of the battery packs, other structural parameters were kept unchanged, the width of the baffle gap was taken as 10 mm, the length of the air outlet was taken as 800 mm, and the air was guided to flow downward through the angle of the deflector to strengthen the turbulent airflow effect. First, we kept the width of the spacer at a value that covers the top of a row of cells; this was used as a basis to discuss the effect of the position and angle of the deflector on the heat dissipation characteristics of the battery pack. The deflectors were positioned on top of the first, second, third, fourth, fifth, sixth, or seventh rows of the battery pack, respectively, and the angle \(\alpha\) of the deflectors was set to 4\({}^{\circ}\), 5\({}^{\circ}\), or 6\({}^{\circ}\), to study the comprehensive effect of the position and angle of the deflectors on the heat dissipation effect of the battery pack. Through simulation analysis, we obtained the changes in the maximum temperature, average temperature, and temperature difference of the battery packs with respect to the change in position and angle of the deflectors, as shown in Figure 15 below. As can be seen from Figure 15, the heat dissipation effect was better when the deflector was positioned above the fifth row of the battery pack and the angle of the baffle was \(6^{\circ}\) and when the baffle was above the fourth row of the battery pack and the angle of the baffle was \(6^{\circ}\); however, the temperature of the battery pack was still higher than desired, so further research and optimization of the heat dissipation effect of the deflector is still necessary. 3.2 Analysis of the Effect of Deflectors Covering Two Rows of Battery Packs on the Heat Dissipation Characteristics of the Battery Packs  
According to the results of the previous analysis, under the condition that other structures of the battery pack are kept constant, the width of the deflectors was lengthened such that they could cover two rows of battery packs, as shown in Figure 16 below. The deflectors were placed above the first and second, second and third, third and fourth, fourth and fifth, and fifth and sixth rows in each layer of the battery pack, and the angles \(\alpha\) were still set at \(4^{\circ}\), \(5^{\circ}\), or \(6^{\circ}\), to study the comprehensive effect of the position and  
Figure 16: Schematic diagram of lengthened deflectors in the battery pack. Figure 14: Schematic diagram of deflector plate: (**a**) three-dimensional schematic diagram of the deflector; and (**b**) two-dimensional schematic diagram of the deflector. Figure 15: Temperature change curves for the battery pack: (**a**) the maximum temperature change curve; (**b**) the average temperature change curve; and (**c**) the temperature difference change curve. angle of the deflector on the heat dissipation effect of the battery pack. Other conditions were kept constant, and the obtained analysis results for the maximum temperature, average temperature, and temperature difference of the battery pack with respect to the position and angle of the deflector are shown in Figure 17.  
Compared with the previous results, with an increase in the width of the deflector, the maximum temperature of the battery pack decreased by 2.2 \({}^{\circ}\)C, the average temperature of the battery pack decreased by 1.6 \({}^{\circ}\)C, and the temperature difference of the battery pack decreased by 2.3 \({}^{\circ}\)C. It can be seen that increasing the width of the deflector in this way can improve the heat dissipation effect of the battery pack.