Connecting device between batteries

Abstract

An inter-battery connection device for connecting terminals of two batteries (1a, 1b) arranged with their axes parallel to each other. The inter-battery connection device includes an inter-battery connection plate (11) that connects the battery case bottom (2) and the sealing plate (3) of the two batteries. The inter-battery connection plate (11) includes welding portions (4) at the ends of its base plate (6) for welding to the case bottom (2) and the sealing plate (3), respectively. An intermediate metal plate (7) is joined to the middle part of the base plate (6) between the welding portions (4, 4) to form an intermediate portion (5) having a greater thickness than each welding portion (4). The inter-battery connection device has reduced electric resistance while achieving improved weldability.

Description

technical field [0001] The present invention relates to an inter-battery connecting device for connecting terminals of batteries arranged in parallel. Background technique [0002] In recent years, the portability and wirelessization of electronic equipment such as AV equipment, personal computers, and portable communication equipment have rapidly developed. As a power supply for driving these electronic equipment, high reliability and easy maintenance are required, so nickel is typically used. Cadmium storage battery, nickel metal hydride storage battery and lithium secondary battery, etc. Furthermore, these batteries are widely used in various other applications, and in particular, they are being used as power sources for driving electric bicycles, lawn mowers, and electric vehicles that require relatively large load characteristics. In batteries for such driving power sources, charge and discharge characteristics of higher currents are required, and therefore the develop...

AI Technical Summary

Problems solved by technology

However, since the width of the connecting plate 34 between batteries is difficult to increase to more than the diameter of the sealing plate 33, it is considered to increase the thickness of the connecting plate 34 between batteries, but if the thickness is increased, the weldability of the battery case and the sealing plate will get worse

In addition, when two battery modules connected in a straight line are connected between respective one ends, the position of the end surfaces needs to be adjusted so that they are on the same plane, but if the positions are slightly shifted from the same plane, the larger the inter-battery connecting plate 34 The thickness of the plate is more difficult to follow

[0007] For this reason, there is a problem that the resistance increases due to peeling of the welded part, and there are problems such as deformation of the battery case and the sealing plate, or perforation of the battery case due to welding with excessive energy.

[0008] In addition, although it is known to change the material of the inter-battery connecting plate to a metal with low resistivity such as copper to suppress the thickness, if the resistivity of the inter-battery connecting plate decreases, the weldability will deteriorate, and the weld strength cannot be ensured. question

[0009] In addition, in the battery connecting member disclosed in Patent Document 1, in order to adapt to large current discharge, the thickness needs to be increased. The weldability of the bottom surface is deteriorated, the welding strength is reduced, and there is a possibility of perforation at the welded part of the bottom surface of the shell, and there is a problem that the position deviation of the end surfaces that should be connected to each other cannot be followed.

Images