Page 68 - Battery Reference Book

Heating effects in batteries 9/53

0.4

(0 .
I
m 0.3
Y
m
P
I .6 r
.- P
U
1.5 .- p 0.2
> L
I
3
1.4 U
P
1.3 z -
4- -
m
2
C ._ 5 0.1
1.2 g r
U
w
1.1
I I I l I I I I .o I I I / I l l
100 200 300 400 500 600 700 0 100 200 300 400 500 600 700
Discharge current (A) Discharge current (A)
Figure 1.48 Discharge of a 2 V lead-acid battery: heat production Figure 1.50 Discharge of a 2 V lead-acid battery: heat production
per unit time and end-point voltage as a function of discharge per unit time and A h capacity as a function of discharge current
100 - x.
90 - 100 - \
-
5 80
Y
0
I -
!& 70 90 -
-
L
r -
m
.; 60 - m
U 2 80-
-
m m m
5 50-
Y j 70-
(51
.- Y
2 40- U -
U 60
U I
30- 4- -
F 50
-
a
?I b
s 20- 0
I u 40-
> -
10 - 2 30-
I
I 1 I I l l I I o I
0 100 200 300 400 500 600 700 = 20-
Discharge current (A) -
10
Figure 1.49 Discharge of a 2 V lead-acid battery: heat evolved
during whole discharge and Ah capacity as a function of discharge I I I I I I 1
current 0 100 200 300 400 500 600 700
Discharge current (A)
1.22.2 Effect of charging current and cell Figure 1.51 Discharge of a 2V lead-acid battery: heat evolved
resistance on heat prodamction in lead-acid during whole discharge and energy density as a function of
discharge current
batteries
During the charging of a lead-acid battery two pro- or loss of heat. The heat content AH of the reaction
cesses occur which are associated with the production of lead sulphate to produce lead and lead dioxide has