JPS6178049A - Small-sized button type cell - Google Patents

Abstract

PURPOSE:To prevent the failure occurrence due to nickel plating burrs during sealing by setting the plating hardness of the bent section on the opening side of a positive electrode to 400-600 by Vickers hardness in a small-sized button type cell. CONSTITUTION:A small-sized button type cell is formed by bending the opening end of a nickel-plated positive electrode case 1 to the sealing plate 2 side via an insulating packing and sealing it. In this case, the plating hardness of the bent section on the opening side of a positive electrode case 1 is set to 400-600 by Vickers hardness, larger than the conventional one. Accordingly, burrs due to cutting chip-like nickel plating powder can be prevented from occurring on the upper end section A of the positive electrode case 1 via the local pressure during sealing, sticking to the sealing plate 2, and causing a short-circuit and unsatisfactory insulation, thereby reliability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in small button batteries.

Conventional r:/i configuration and its problems In order to reduce the contact resistance between the positive electrode case and the battery contact, many small button batteries use a Ni-metsted positive electrode case. Conventionally, the hardness of the plating was to be soft enough to withstand bending during sealing, and to prevent cracking, a Vickers hardness (l(V)) of 200 to 400 was used.

In a battery using a positive electrode case with such hardness, the plating becomes soft due to contact with the sealing mold during sealing, and as shown in Figure 1, flakes of N1 plating occur at the upper end (inlet) of the positive electrode case 71. If it becomes loose and comes off, or if local pressure is applied to the side of the positive electrode case (section B in Figure 1) from the outside and scratches occur, N1 plating powder in the form of cutting chips (Figure 2) c') occurs and adheres between the positive electrode case 1 and the sealing plate 2, causing an external short circuit in the battery, causing capacity consumption and capacity deterioration. In addition, after inserting the battery into the device, Ni plating powder may be attached to the device's wiring or
If it adheres to a substrate or the like, there is a problem that the device will not operate normally.

Purpose of the Invention The present invention aims to prevent the occurrence of N1 plating in the form of cutting waste, which is the conventional drawback, and to eliminate external short circuits of batteries and functional deterioration of the wiring, board, etc. of the device into which the batteries are inserted. purpose.

Structure of the Invention The present invention provides a small button type battery using an N-plated positive electrode case, in which the plating hardness of the opening-side bent portion of the positive electrode case 1 is 400 to 600 on Vickers hardness (HV).
That is. By configuring in this way, N
It is possible to prevent the occurrence of one-time failure.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described in detail below. Examples of the present invention will be explained based on Table 1 by range of hardness of N1 plating.

■ If the N1 plating hardness is HV200~400, use this N
In the range of e-plating hardness, 23% of defects occur due to pari formation in the Ni plating (occurs in the area shown in Figure 1), the rate of capacity deterioration of the battery itself is 1.2%, and the rate of deterioration of the battery's capacity is 1.2%, (In the case of this example, an electronic wristwatch was used) The incidence of substrate function-reduced products was 0.32%. This hardness range is N
1 plating powder is likely to be generated, and if N-plating powder C' in the form of cutting dust adheres between the positive electrode case and the sealing plate as shown in Figure 2, the positive electrode side and negative electrode side of the battery This can lead to direct conduction between the two sides, resulting in a short circuit and a decrease in the capacity of the battery itself. In addition, if T1 plating adheres to the wiring or circuit board of an appliance (electronic watch, etc.), it will lead to a decline in the functionality of the wiring or circuit board, causing the problem that the appliance itself will no longer function properly. .

■ If the N1 plating hardness is HV400~600, use this N
In the range of i-plating hardness, the defects due to the generation of pari in the Ni plating are 0% under the conditions shown in Figure 1, and the rate of occurrence of products with inferior capacity of the battery itself and the occurrence of loss of function of the board of the device are both 0%. It becomes. As mentioned above, the purpose of eliminating the external short circuit of the battery and the functional deterioration of the wiring, board, etc. of the device into which the battery is inserted due to the occurrence of N1 failure has been fully achieved. The Ni plating hardness in this example is
The component ratio of the plating solution is NiSO4:N C1□:H,
This can be obtained by using B02=7θ:14:10.

■ When the N1 plating hardness is H'1600 to H'800 In this range of Ni plating hardness, there is 0% failure due to pari formation in the N1 plating, and the occurrence of products with inferior capacity of the battery itself and the loss of the function of the board of the device occur. The rate is both KO%. However, in this case, when forming the bent part of the positive electrode case (section D in Figure 1) in the battery sealing process, trap cracks occur in the Ni plating layer (E in Figure 3), and cracks exist under the Ni plating layer. The underlying base layer (F in Figure 3) is exposed, causing deterioration in rust resistance.

(See Table 11 Rust Resistance Test Results).

Therefore, good results have not been obtained even within this N1 plating hardness range.

(Left below) As described in detail in the embodiments described above, the N of the positive electrode case
Eplating hardness is Vickers hardness <Il'l> 400~
By using eoo, the defective rate due to N1 plating, the defective rate due to poor capacity, and the incidence of products whose functions are lost are significantly reduced, and good rust resistance can also be obtained.

[Brief explanation of drawings]

Figure 1 is an enlarged sectional view of the main parts of a small button-type battery, Figure 2 is an enlarged explanatory diagram showing the state in which nickel powder in the form of cutting waste exists between the positive electrode case and the sealing plate of the battery, and Figure 13 is an enlarged cross-sectional view of the main part of the battery. FIG. 2 is an enlarged explanatory view showing a state in which a crack has occurred in the nickel plating layer of the picture case. 1... Positive electrode cake, 2... Sealing plate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A small button type battery using a nickel-plated positive electrode case, wherein the plating hardness of the opening-side bent portion of the positive electrode case is 400 to 600 in Vickers hardness.