JPS60140649A - Cell with terminal - Google Patents

Abstract

PURPOSE:To obtain a cell with a backup terminal having high reliability by making the melt depth and the weld nugget diameter of a cell terminal to be welded within specific ranges. CONSTITUTION:A lead-like terminal and a cell terminal are welded so that the melt depth A of the cell terminal to be welded is 20-70% of the total thickness of the welded object and the weld nugget diameter B is 0.4-0.9mm.. When the melt depth A of the welded object becomes 20% or less of the total thickness of the welded object, the weld strength is reduced, thus resulting in unstable weld, and on the contrary, when it becomes 70% or more and the total thickness of the welded object becomes 0.3mm. or less, a hole is bored or an effect is given on the cell components. In addition, when the nugget diameter B becomes 0.4mm. or less, the weld strength is made unstable, and when it becomes 0.9mm. or more, the energy quantity during welding is increased, and an adverse effect is given on the cell components.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a battery with terminals used as a backup power source for various electronic devices and the like.

Conventional configurations and their problems In recent years, coin-type lithium batteries, in particular, have become widely used as memory backup power sources for electronic devices. This battery has a higher energy density than conventional general batteries, and has excellent long-term storage stability and long-term leakage resistance.

Conventionally, resistance welding has been mainly used to weld the lead strip terminals of this type of battery, and in recent years, welding using a laser has been used. The basic structure of a bank-up power supply is to solder it directly to a printed board, so it is common to weld terminals with good conductivity to the ■ side and O side of the battery. be. It is important that the soldering part between the printed wiring board and the terminal or the welded part between the battery and the terminal does not come off due to vibration or shock during use. In the past, various studies have been made regarding welding conditions, but the major difference from ordinary welding between metals is that the object to be welded is a case or sealing plate that forms the terminal part of a battery, and the welding strength is simply If it increases, the heat generated during welding will have an adverse effect on the active materials, separators, and other parts that make up the battery, and will significantly deteriorate the characteristics of the battery. If welding is performed in a way that does not affect the heat of the broken battery components, the characteristics will deteriorate in vibration tests, impact tests, tensile tests, etc., and the terminals will easily come off from the battery and will not function as a banker knob. The material of the battery terminal part, which is the object to be welded,
When the thickness etc. change, the optimum conditions must be determined horizontally each time, which poses problems such as a lot of time being required.

[Objective of the Invention] The object of the invention is to solve the above-mentioned conventional drawbacks, to provide a highly reliable bank amplifier that does not affect the battery components, and has good welding between the battery terminal part and the lead strip terminal. The purpose of this invention is to provide a battery with terminals.

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention has a cross-sectional view of a welded portion between a lead piece terminal and a battery terminal part shown in FIG. It is characterized in that the weld penetration depth A is 20 to 70% of the total thickness of the workpiece, and the weld nugget diameter B is in the range of 0.4 to 0.9+n+n.

As shown in Figure 1, the cross section of the welded part is as shown in (a) in the case of electrical resistance welding, and as shown in (b) in the case of laser welding. At this time, if the weld penetration depth A of the welded object is less than 20% of the total thickness of the welded object, the welding strength will decrease and the welding will become unstable. If the thickness is less than the thickness in the 0.3 column, holes may form or the battery components may be affected. In addition, even if the thickness is 0.3" or more, if welding is performed at a penetration depth of 7061) or less, the thermal energy generated during welding will be large and a hole will not be formed, but the structure of the battery have a negative impact on things.

In addition, if the nugget diameter B becomes less than 0.4 mrn, the welding strength becomes unstable, and if it becomes more than 0.9+n+n, the amount of energy during welding increases, which may shorten the life of the welding equipment or adversely affect the battery components. . In the welding according to the present invention, it is possible to determine the welding conditions in a short time even if the particle quality or plate thickness of the welded object or the welded object changes.

DESCRIPTION OF EMBODIMENTS FIG. 2 shows a sectional view of a bank-up battery using a coin-type lithium battery in an embodiment of the present invention. In the figure, 1 is a lead piece terminal' punched out of pure nickel thin plate, 2 is a sealing plate made of nickel-plated stainless steel, 3 is a case made of nickel-plated stainless steel, 4 is a gasket made of polypropylene, and 5 is a case made of nickel-plated stainless steel. positive electrode current collector,
6 is a positive electrode mixture, 7 is a separator, and 8 is a negative electrode active material made of lithium. In addition, the total height of the and - batteries is 2.5m.
+n.

The outer diameter is 23 mm. FIG. 3 shows an enlarged cross-sectional view of a spot weld between the lead strip terminal and the feed plate. 1 is 0
．． 2 was a pure nickel thin plate terminal with an order of thickness, and 2 was a sealing plate made of stainless steel with a thickness of 0.30 and nickel plated to a thickness of 3 to 4 μm, and a laser welding machine was used to weld these two. Welding was performed with a weld penetration depth of 50 inches and a nugget diameter of 0.6 m+n.

Next, using a pure nickel plate with a thickness of 0.2 mm as a lead strip terminal and the battery described above, the weld penetration depth and nugget diameter of the welded object were varied and the results were investigated, as shown in Figure 4. . In this figure, A and B are areas where welding is unstable;
C is an area where a hole is formed in the battery or has an adverse effect on the battery components, and D is an area where a load is applied to the welding machine. Therefore, from this figure, the penetration depth of the workpiece is 20 to 70%.
, a region where the nugget diameter is 0.4 to 0.9+o+ is selected as a preferable region. Further, welding was carried out under conditions 1 to 5 shown in FIG. 4, and the evaluation results of various properties are shown in the following table. Note that 5 was welded under the conditions according to the present invention. As is clear from this table, it is clear that the products of the present invention are superior to other products.

In addition, ○ indicates good quality, △ indicates normal, and × indicates the degree of defect.

Among the tests in the previous table, the tensile strength test is the strength when the lead piece terminal is forcibly pulled and the terminal comes off from the battery terminal part, and the torque test is the strength when the terminal comes off by applying a rotating torque of 3 to 9 to the terminal. The number of items produced is displayed. Regarding the battery characteristics, static characteristics such as voltage and resistance during welding were investigated and compared with the static characteristics after welding. Furthermore, the impact test
The battery was placed on a printed wiring board, allowed to fall naturally from a height of 16 rrL, and after repeating this 15 times, the disconnection of the terminals was evaluated.

Effect 1: According to the welding of the present invention, it does not adversely affect the battery terminals, which are the objects to be welded, as well as the various properties of the battery, and the properties in vibration tests, impact tests, tensile tests, etc. are improved. −. Furthermore, laser spot welding has the advantage that the penetration depth can be predicted based on the appearance of the welding point and the nugget diameter without looking at a cross-sectional view of the welding area, making it possible to set welding conditions in a short time. .

[Brief explanation of drawings]

Figures 1 (a) and (b) are cross-sectional views for explaining the welded part;
FIG. 2 is a cross-sectional view of a battery with a backup terminal, FIG. 3 is an enlarged cross-sectional view of a welded part thereof, and FIG. 4 is a diagram showing the relationship between the penetration depth of the workpiece and the nugget diameter. 1...Lead piece terminal, 2...Battery sealing plate, 3...Battery case, A...Depth of welding of the object to be welded, B ...Weld nugget diameter. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 (2) Figure 3 Figure 4 0 1), J θ, 2 θ, 3 o, 4 θ5 θ6
6. 'l tl, 8 0E 17) Nugget diameter (form of amendment to group procedure (method) l Indication of the case 1982 Patent Application No. 250639 2 Name of invention Terminal battery 3 Person making the amendment 4 Relationship with the case Patent Application Address: 1006 Bold Kadoma, Kadoma City, Osaka Prefecture Name (
582) Matsushita Electric Industrial Co., Ltd. Representative: Toshihiko Yamashita 4 Actual Representative Address: Matsushita Electric Industrial Co., Ltd., 1006 Bold Kadoma, Kadoma City, Osaka 571, Contents of the Amendment (1) Line 3, page 8 of the specification ``Figure 1 (a) and (b) are cross-sectional views for explaining the welded part.'' was corrected to ``Figure 1 (a) and main body) are cross-sectional views for explaining the welded part.'' Masu. (2) Revise Figure 1 of the drawing as shown in the attached sheet. Figure 1 (Ino (Rono)

Claims (1)

[Claims] A battery in which a lead piece terminal is welded to a battery terminal part,
The weld penetration depth of the battery terminal part that is broken by the object to be welded is 20 to 70 times the total thickness, and the weld nugget diameter is 0.4 to 0.9 m.
A battery with terminals whose secret feature is welding in the range of m.