Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Plural cells
Reexamination Certificate
2002-05-09
2004-11-30
Cantelmo, Gregg (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Plural cells
C320S116000, C320S118000, C320S120000
Reexamination Certificate
active
06824918
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a battery pack, and more particularly, to a battery pack included in a battery, for example, a smart battery, used in a portable electronic apparatus such as a notebook computer.
2. Description of the Related Art
FIG. 1
shows the wiring structure of a battery pack
11
of a conventional smart battery
1
.
FIG. 2
shows an equivalent circuit corresponding to the wiring structure of FIG.
1
.
FIG. 3
shows a resistance equivalent circuit corresponding to the wiring structure of FIG.
1
.
Referring to
FIGS. 1 through 3
, the conventional smart battery
1
includes a smart circuit module
10
and the battery pack
11
. A negative pole output terminal of the battery pack
11
is connected to a negative pole terminal (B−) of the smart battery
1
. Also, an 8 V (volts) positive pole output terminal of the battery pack
11
is connected to a 8 V positive pole terminal (
8
B+) of the smart battery
1
. A 12 V positive pole output terminal of the battery pack
11
is connected to a 12 V positive pole terminal
12
B+ of the smart battery
1
. As output terminals of the smart circuit module
10
, there are a positive pole output terminal (P+) connected to a 12 V positive pole terminal (
12
B+), a negative pole output terminal (P−) connected to a negative pole terminal (B−), a clock terminal C, a data terminal D, and a temperature terminal T.
In the battery pack
11
, the first through seventh secondary batteries B
1
-B
7
are sequentially stacked from the position of output terminals of a pack connected to power input terminals B−,
8
B+, and
12
B+ of the smart circuit module
10
. Positive pole terminals of the first through third secondary batteries B
1
, B
2
, and B
3
are connected in common by a conductive body to the 12 V positive pole terminal
12
B+ of the smart battery
1
. Here, since the common connection portion of the positive pole terminals of the first through third secondary batteries B
1
, B
2
, and B
3
occupy most of the conductive body, internal resistance of the conductive body is not so high to need consideration in relation with the current paths. Also, negative pole terminals of the first through third secondary batteries B
1
, B
2
, and B
3
and positive pole terminals of the fourth through sixth secondary batteries B
4
, B
5
, and B
6
are connected in common by a conductive body to the 8 V positive pole terminal
8
B+ of the smart circuit module
10
. Here, since the common connection portion of the negative pole terminals of the first through third secondary batteries B
1
, B
2
, and B
3
and the positive pole terminals of the fourth through sixth secondary batteries B
4
, B
5
, and B
6
occupy most of the conductive body, internal resistance of the conductive body is not so high to need consideration in relation with the current paths.
The ninth and eighth secondary batteries B
9
and B
8
are sequentially disposed from the positions of the output terminals of the pack in a row in a direction perpendicular to a direction in which the first through seventh secondary batteries B
1
-B
7
are arranged. Positive pole terminals of the ninth and eighth secondary batteries B
9
and B
8
, negative pole terminals of the fourth through sixth secondary batteries B
4
, B
5
, and B
6
, and a positive pole terminal of the seventh secondary battery B
7
are connected in common by a second conductive body L
2
. Here, since the common connection portion of the negative pole terminals of the fourth through sixth secondary batteries B
4
, B
5
, and B
6
, and the positive pole terminal of the seventh secondary battery B
7
occupy most of a vertical portion of the second conductive body L
2
, internal resistance of the vertical portion is not so high to need consideration in relation with the current paths. However, because a horizontal portion of the second conductive body L
2
is not so, internal resistance of the horizontal portion has a great effect in relation with the current paths. Meanwhile, negative pole terminals of the seventh, eighth, ninth secondary batteries B
7
, B
8
, and B
9
are connected in common by a first conductive body L
1
. Here, most of the first conductive body L
1
which is the longest than the other conductive bodies is disposed between a connection portion of the negative pole terminal of the ninth secondary battery B
9
and a connection portion of the negative pole terminal of the eighth secondary battery B
8
. Accordingly, internal resistance of the first conductive body L
1
has the greatest effect in relation with the current paths.
Referring to
FIG. 3
, the current path through which current flows from the 12 V positive pole terminal
12
B+ of the smart circuit module
10
to the negative pole terminal B− can be branched to nine ways listed in Table 1.
TABLE 1
Secondary
battery
Current path
B1
12B+ → B1 → (B4, B5, and B6) → R2 → B9 → B−
B2
12B+ → B2 → (B4, B5, and B6) → R2 → B9 → B−
B3
12B+ → B3 → (B4, B5, and B6) → R2 → B9 → B−
B4
12B+ → (B1, B2, and B3) → B4 → R2 → B9 → B−
B5
12B+ → (B1, B2, and B3) → B5 → R2 → B9 → B−
B6
12B+ → (B1, B2, and B3) → B6 → R2 → B9 → B−
B7
12B+ → (B1, B2, and B3) → (B4, B5, and B6) → B7 → R1 → B−
B8
12B+ → (B1, B2, and B3) → (B4, B5, and B6) → R2 → B8 → R1 → B−
B9
12B+ → (B1, B2, and B3) → (B4, B5, and B6) → R2 → B9 → B−
In Table 1, the internal resistance of the first conductive body L
2
is greater than that of the second conductive body L
2
. Thus, referring to Table 1, the resistance of the current path of the eighth secondary battery B
8
is the highest, the resistance of the current path of the seventh secondary battery B
7
is the second highest, the resistance of the current path of the ninth secondary battery B
9
is the third highest, and the resistance of the current path of each of the remaining first through sixth secondary batteries B
1
-B
6
is the lowest.
Accordingly, in the conventional battery pack
11
according to a simple internal wiring, charging/discharging performance of the eighth secondary battery B
8
is the worst and the life span thereof is the shortest. Therefore, performance of the smart battery
1
including the battery pack
11
is low and the life span thereof is reduced.
SUMMARY OF THE INVENTION
To solve the above-described and other problems, it is an object of the present invention to provide a battery pack in which the current characteristics of internal batteries are equalized so that the charging/discharging performance and life span thereof is improved.
It is another object to have a battery pack that is easy and inexpensive to manufacture.
To achieve the above and other objects, there is provided a battery pack in which first through n
th
secondary batteries, where n is an integer which is 2 or more, are sequentially stacked from the pack output terminals, (n+2)
th
and (n+1)
th
secondary batteries are disposed from the positions of pack output terminals in a row in a direction perpendicular to a direction in which the first through n
th
secondary batteries are arranged, first polarity terminals of the (n+2)
th
and (n+1)
th
secondary batteries are connected with each other, and a pack output terminal having a second polarity opposite to the first polarity and the second polarity terminals of the n
th
, the (n+1)
th
, and the (n+2)
th
are connected in common by a conductive body, wherein the second polarity terminals of the (n+2)
th
and (n+1)
th
secondary batteries are connected with each other by a first conductive body, a second conductive body is connected to the pack output terminals having the second polarity are connected at a first b
Bushnell , Esq. Robert E.
Cantelmo Gregg
Samsung SDI & Co., Ltd.
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