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A battery pack comprises a plurality of rectangular shaped batteries, wherein each of the plurality of rectangular shaped batteries is formed into a thin rectangular-parallelepiped shape, and wherein the plurality of rectangular shaped batteries are stacked side-by-side in a thickness direction, and

A battery pack comprises a plurality of rectangular shaped batteries, wherein each of the plurality of rectangular shaped batteries is formed into a thin rectangular-parallelepiped shape, and wherein the plurality of rectangular shaped batteries are stacked side-by-side in a thickness direction, and a pair of pressurizing plates, wherein one of the pressurizing plates is located at each end of the stacked rectangular shaped batteries oriented in the thickness direction, wherein the pressurizing plates are elastically pushed against each other to pressurize the plurality rectangular shaped batteries.

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What is claimed is: 1. A battery pack comprising: a plurality of rectangular shaped batteries, wherein each of the plurality of rectangular shaped batteries is formed into a thin rectangular-parallelepiped shape, and wherein the plurality of rectangular shaped batteries are stacked side-by-side in

What is claimed is: 1. A battery pack comprising: a plurality of rectangular shaped batteries, wherein each of the plurality of rectangular shaped batteries is formed into a thin rectangular-parallelepiped shape, and wherein the plurality of rectangular shaped batteries are stacked side-by-side in a thickness direction, and each battery includes a pin and a recess, the recess having a slot shape, said slot shape being longer in a width direction of the battery than in a height direction of the battery; and a pair of pressurizing plates, wherein one of the pressurizing plates is located at each end of the stacked rectangular shaped batteries oriented in the thickness direction and one of the plates is fitted with a compression spring which serves as an elastic member, wherein the pressurizing plates are elastically pushed against each other to pressurize the plurality of rectangular shaped batteries using the compression spring, wherein at least a pair of the rectangular shaped batteries stacked adjacent each other are stacked in a manner such that the pin of a first battery of the pair is inserted into the recess of a second battery of the pair so that movement in the height direction of the stacked rectangular shaped batteries, which is orthogonal to the thickness direction, is suppressed, and the pin of the first battery eon slide along the width direction inside the recess of the second battery, wherein a positive terminal plate and a negative terminal plate are provided on respective side surfaces of the rectangular shaped batteries along a width direction of the stacked rectangular shaped batteries, which is orthogonal to the thickness direction, the positive terminal plate being in contact with a negative terminal plate of one adjacent rectangular shaped battery and the negative terminal plate being in contact with a positive terminal plate of the other adjacent rectangular shaved battery. 2. A battery pack according to claim 1, wherein one of the pair of the pressurizing plates is connected to an end plate located beyond the other pressurizing plate with respect to the stacked rectangular shaped batteries, the other pressurizing plate proximate to the end plate being pushed away from the end plate by elastic members. 3. A battery pack according to claim 1, wherein the positive terminal plate and the negative terminal plate provided in each of the rectangular shaped batteries are pushed so that the positive terminal plate and the negative terminal plate are held to the negative terminal plate and the positive terminal plate of the adjacent rectangular shaped batteries by pressure. 4. A battery pack according to claim 3, wherein the terminal plates are formed of clad plates in which plates having a high elasticity and plates having a high conductivity are layered. 5. A battery pack according to claim 1, wherein every other or every few of the stacked rectangular shaped batteries of the rectangular shaped batteries stacked side-by-side in the thickness direction is or are fixed to a case.