Page 65 - Battery Reference Book
P. 65

1/50  introduction to battery technology
                  0.4 -                                     0.4



                -                                         m
                -
                m
                -                                         1
                                                          -
                                                          E  0.3
                Y
                a,  0.3  -                                Y
                P                                         W
                                                          P
                r                                         2
                m  ._                                     ::                               -  1.6
                U                                         .-
                a
                                                          U
                .-                                          0.2                            -  1.5  -
                L                                         .-
                                                                                                >
                s                                         L                                     -
                U   -                                     s
                  0.2                                     U
                C                                         P                                -  1.4   c  -
                1l                                        -                                -  1.3  2"
                                                          B
                G                                         ;
                a                                           0.1                                 C  .-
                P
                                                          a,
                -   -                                     I                                -  1.2  8
                                                                                                P
                e  0.1
                .-                                                                         -  1.1   W
                m
                I                                               IIIIIIIIIIIIIIJ  Ji.0
                                                              0   4   8   12   16   20  24  28
                                                                     Discharge time (mid
                    L   I    I   I   I   I   I   I          602480300   150     90      60
                   0    100  200  300  400   500  600  700
                                                                    Discharge current (A)
                             Discharge current (A)
                                                         Figure 1.38  Discharge of a 2 V lead-acid battery: heat production
             Figure 1.36  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 as a function of discharge current   time
                                                                                   Discharge
                                                                                   net total
                                                                                   Joule + AH
                                                          r  80                          a
                                                          U
                                                          x  70
                                                           c
              E   l                                        I
                                                1.6                                         600
                                                1.5 -                                       500 -
                                                                                               a
                                                   >                                           -
                                                   I
                                                1.4  g                                      400  E
                                                                                               F
                                                   -                                        300  ;
                                                   m
                                                   w
                                                1.3  g
                                                   c                                           P
                                                   ._
                                                   C
                                                1.2  @                                      200 2
                                                                                               P
                                                   U                                Discharge   ._
                                                1.1                                         100 a
                                                1 .o           111 I  I  I  I1 II Ill I  I  I   0
                 0    4   8   12   16  20  24   28            0   4   8   12   16   20  24   28
                         Discharge time (min)                          Discharge time (min)
             Figure 1.37  Discharge of  a 2 V  lead-acid  battery: heat evolved   Figure 1.39  Discharge of a 2V lead-acid  battery: heat evolved
             during whole  discharge, and  end-point  volts  as  a  function of   during whole discharge, and discharge current as  a function of
             discharge time                              discharge time
   60   61   62   63   64   65   66   67   68   69   70