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Battery module and method for welding battery module

A technology of battery components and welding methods, which is applied to battery pack components, conductive connections, welding equipment, etc., can solve problems such as low efficiency, and achieve the effect of reducing the influence of heat and reducing skew

Active Publication Date: 2015-04-22
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In addition, there is a problem of inefficiency in heating and cooling the battery due to the existence of the connecting plate 18

Method used

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  • Battery module and method for welding battery module
  • Battery module and method for welding battery module
  • Battery module and method for welding battery module

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] Figure 1 ~ Figure 4 Embodiment 1 of this invention is shown.

[0041] figure 1 The battery pack 12 according to Embodiment 1 is shown, and is configured such that negative electrodes 21 of a plurality of cylindrical batteries 16 , 16 , . . . are electrically connected through a connecting plate 23 . 24 is the negative electrode welding part of the negative electrode 21 and the connection plate 23, and laser welding is performed. The positive electrode cap 11 which is the protruding portion of the positive electrode and the connection terminal 17 of the wiring board 15 are electrically connected at the positive electrode welding portion 20 . An insulator 19 is inserted between the wiring board 15 and the connecting plate 23 .

[0042] In addition, the basic structure of each cylindrical battery 16, 16, . . . Figure 10 The structures shown are the same, and although the same reference numerals are given to the same parts for description, the structure of the electri...

Embodiment approach 2

[0050] The negative electrode of the shoulder of the cylindrical battery is due to the figure 2 The surface shown has curvature, so in the case of low precision in the shape of a cylindrical battery, such as Figure 5 The shown close contact portion 25 is eccentric to the cylindrical battery 16 itself, and the close contact portion with the connection plate 23 has an oval shape. Furthermore, when the cylindrical battery 16 itself is rotated to irradiate laser light, the trajectory of the close contact portion 25 changes due to the rotation of the cylindrical battery 16 itself, making it difficult to align the laser trajectory with the close contact portion 25 . As a result, when such circumferential welding is performed, an offset occurs between the close-fitting portion 25 and the laser trajectory 27, and the shoulder-shaped caulking portion of the battery case 8 and the connection plate placed thereon Since gaps are generated between 23, the bonding area becomes small, and...

Embodiment approach 3

[0062] In Embodiment 2, the scanning of the laser beam 26 moves on the trajectories L1, L2, L3, and L4 of the arrangement direction (direction of the arrow symbol 28) of the plurality of cylindrical batteries 16, 16, . . . From the point of view of the joint strength of the circumferential azimuth angle and the uniformity of the current density when the battery module operates, use such as Figure 7 Also suitable are welds shown as rectangular shapes, for example in the shape of a square. At this time, the joint area may also become smaller, and when the battery pack operates, the heat generated at the joint part becomes larger when the current flows, and the temperature rise may not be within the allowable range. In this case, if Figure 8 As shown, the joint area can be increased and the joint strength can be improved by double welding lines.

[0063] Figure 7 In the illustrated embodiment, the laser scanning position is moved along the trajectory L1, only from before it ...

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Abstract

Provided is a battery module comprising multiple cylindrical batteries, wherein electrodes of the individual cylindrical batteries are electrically connected, and wherein a connection plate (23) is placed at a position that is an end part of the cylindrical battery on a side on which a protruded part (11) of a positive electrode is arranged, and that is positioned between shoulder parts (21a) of a battery case (8) of the cylindrical battery. The connection plate (23) is closely adhered to the shoulder part (21a) that has a curvature, and the closely adhered part between the connection plate (23) and the shoulder part (21a) is connected through a negative electrode welding part (24). The shape of the negative electrode welding part is preferably a line that intersects the closely adhered part between the connection plate (23) and the shoulder part (21a).

Description

technical field [0001] The present invention relates to a battery assembly formed by combining a plurality of batteries. Background technique [0002] In recent years, in order to reduce the use of fossil fuels and reduce CO2 emissions, there has been an increasing demand for battery modules as power sources for driving electric motors such as automobiles. Such a battery pack is configured to load a plurality of batteries in order to obtain a required voltage and capacity. [0003] As the battery used here, rechargeable batteries such as nickel-metal hydride batteries, nickel-cadmium batteries, and lithium-ion batteries that can be used repeatedly can be exemplified from the viewpoint of saving resources and energy. The electromotive force is high and the energy density is high, so expectations for batteries used as battery components are increasing. [0004] Cylindrical lithium-ion rechargeable batteries such as Figure 10 As shown, there are a positive electrode 2 and a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/20B23K26/20H01M2/10H01M50/213H01M50/227H01M50/278H01M50/503H01M50/516H01M50/522
CPCH01M2/206B23K2201/38H01M2/1077B23K26/22B23K2101/38Y02E60/10H01M50/522H01M50/278H01M50/213H01M50/516H01M50/227H01M50/503B23K26/21H01M50/50
Inventor 宇津吕英俊西川幸男田中知实糸井俊树
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD