WO2002056424A1

WO2002056424A1 - Contact terminal

Info

Publication number: WO2002056424A1
Application number: PCT/JP2001/003319
Authority: WO
Inventors: Hiroshi Andou
Original assignee: Toshiba It & Control Systems Corporation
Priority date: 2001-01-04
Filing date: 2001-04-18
Publication date: 2002-07-18
Also published as: CN1408133A; KR20020097139A; KR100463950B1; TW509794B; CN1234196C

Abstract

A pair of contact terminals (3, 4) are opposed to each other with an electrode (1) in contact between them. Hard particles (6) are applied to one contact of the pair of contact terminals (3, 4), with the other contact remaining unprocessed.

Description

Specification

Contact terminal

Technical field

The present invention relates to a contact terminal of a device that comes into contact with a conductor having an electrode, and in particular, can maintain a value of a contact resistance generated between the electrode and the electrode close to an initial value over a long period of time. This is related to the contact terminal.

Background art

Conventionally, for secondary batteries such as lithium polymer batteries, a charge / discharge test has been performed by a charge / discharge test apparatus in order to ensure product quality.

This charging / discharging test apparatus detects the voltage between the electrodes of the secondary battery while charging the secondary battery, and applies a predetermined charge voltage to the secondary battery. Control.

The secondary battery is provided with electrodes, and is usually arranged one by one in a plurality of grooves formed on the bottom surface of the tray accommodated in the above-mentioned charge / discharge test device, and the battery electrode portion is located on the lower side. It is arranged as follows. In addition, the tray can accommodate a plurality of secondary batteries.

FIGS. 1A and 1B are schematic diagrams showing a configuration example of a conventional battery test contact terminal used by being attached to this type of charge / discharge test apparatus.

In FIGS. 1A and 1B, in order to conduct a charge / discharge test of a secondary battery 2 provided with thin plate-shaped positive and negative electrodes 1, a plurality of (three in the figure) secondary batteries 2 were used. A pair of contact terminals 3 and 4 are arranged facing each other so as to be in contact with and sandwich electrode 1 at the center. Is

One end (lower end) of the pair of opposed contact terminals 3 and 4 on the opposite side to the electrode 1 is supported by a fixed plate 5, and the fixed plate 5 is operated. The electrode 1 of the secondary battery 2 is pressed (open / closed).

Here, as a material of the pair of contact terminals 3 and 4, for example, copper or a copper alloy-based material is used as it is, or a surface treatment such as gold plating is used.

However, the conventional contact terminals as described above have the following problems.

In other words, the contact terminals attached to the conventional charge / discharge test equipment are composed of a high-resistance film adhered to the positive and negative electrodes 1 of the secondary battery 2 when conducting the charge / discharge test of the secondary battery 2. Each time an oxide film is interposed, the contact resistance between the pair of contact terminals 34 increases.

In addition, the stripped piece of the oxide film is moved to the conductive surface side of the contact terminal by repeated operation, and is deposited as if an oxide film is formed on the contact terminal side, thereby further increasing the contact resistance.

Further, in order to obtain a stable contact resistance in the conventional contact terminal, the contact pressure must be increased to break the high-resistance film.

If the contact resistance increases, overcurrent or overdischarge of the secondary battery 2 occurs, causing damage to the secondary battery 2 or causing a problem such as heat generation in the secondary battery 2. Will be done. Disclosure of the invention An object of the present invention is to maintain the value of the contact resistance generated between the contact terminal and the electrode at a value close to the initial value for a long period of time without adding a sliding contact force. Prevents overcurrent and overdischarge caused by poor contact between the terminal and the electrode, preventing damage to the secondary battery and causing problems such as heating of the secondary battery. Another object of the present invention is to provide a contact terminal capable of performing a charge / discharge test with high accuracy while preventing the contact terminal.

In order to achieve the above object, according to the present invention, the contact terminals are a pair of contact terminals arranged to face each other so as to be in contact with and sandwich the electrode, and Hard particles are adhered to one contact surface of the contact terminal, and the other contact surface is left as a material without adhering the hard particles.

Therefore, in the contact terminal of the present invention, the hard particle attachment surface of the contact terminal and the material surface are slid in contact with each other without sandwiching the electrode, thereby providing a fine polishing action on the contact terminal material surface side. More specifically, the oxide film, which is a high-resistance film deposited in contact with the electrode up to the previous time, is removed to form a rough surface.

Then, the secondary battery electrode is arranged between the contact terminals, and the contact terminals are brought into contact with each other, whereby fine irregularities formed on the contact terminal material surface side are reduced. By breaking the oxide film, which is a high-resistance film adhered to the battery, without increasing the amount of sliding contact, it is possible to reduce the contact failure between the contact terminal and the electrode of the secondary battery over a long period of time. It will be possible.

As a result, the value of the contact resistance generated between the battery and the electrode of the secondary battery is maintained at a value close to the initial value for a long period of time. Prevents overcurrent and overdischarge of the secondary battery due to poor contact with the battery electrode, causing damage to the secondary battery and causing problems such as heat generation in the secondary battery. In addition, it is possible to perform an accurate charge / discharge test.

Further, according to a second aspect of the present invention, the contact terminals are a pair of contact terminals arranged so as to be in contact with each other so as to be in contact with and sandwich the electrode at the center. A cut is made in the axial direction from each tip to divide it into a plurality of divided pieces, and hard particles are attached to one of the contact surfaces of the divided contact terminal pieces, and the other contact surface is made of hard particles. The material is left unadhered.

Therefore, in the contact terminal of the present invention, as described above, fine irregularities are formed on the contact terminal material surface side by the hard particles attached to one contact surface of the plurality of divided contact terminal divided pieces. In addition, by making the cuts, it is possible to individually absorb the difference in the thickness of the hard particles between the hard particle-attached portion of the same contact terminal and the portion of the raw material as it is.

This makes it possible to prevent the contact surface from rising due to the attachment of hard particles when it is necessary to contact a plurality of contacts in the same space with one electrode. The problem of contact resistance occurring between the contact point and the contact point can be prevented.

In here, particularly as the above hard particles, for example, da I Yamon de, according to the contact terminals of the this using abrasive for CBN or the like generally tools preferred correct _c present invention, between the electrode The value of the contact post that occurs during a long period of time without increasing the sliding contact force of the contact terminal Maintains a value close to the initial value, thereby preventing overcurrent and overdischarge of the secondary battery due to poor contact with the electrode of the secondary battery, and damaging the secondary battery. In addition to preventing generation of defects such as heat generation in the secondary battery, it also enables accurate charge / discharge tests to be performed.

Further, according to the contact terminal of the present invention, when one electrode needs to contact a plurality of contacts with the same space, it is possible to prevent the contact surface from rising due to the attachment of hard particles, Failure of contact resistance can be prevented.

BRIEF DESCRIPTION OF THE FIGURES

1A and 1B are schematic diagrams illustrating a configuration example of a conventional contact terminal for battery test.

2A and 2B are schematic views showing a first embodiment of the contact terminal according to the present invention.

3A to 3C are schematic diagrams showing a contact terminal according to a second embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First Embodiment)

2A and 2B are schematic diagrams showing a configuration example of the contact terminal according to the first embodiment. The same parts as those in FIGS. 1A and 1B are denoted by the same reference numerals and the description thereof will be omitted. Omitted, and only the differences are described here.

That is, the contact terminal according to the first embodiment is shown in FIG. 2A. As shown in FIG. 1A, the hard particles 6 are adhered to one contact surface (the contact surface of the contact terminal 3 in this example) of the pair of contact terminals 3 and 4 facing each other in FIG. 1A. On the other hand, the contact surface (the contact surface of the contact terminal 4 in this example) is made of a material (copper or copper alloy material) without the hard particles 6 attached thereto. Here, as the hard particles 6, it is preferable to use, for example, any one of diamond, CBN, and the like, but in addition, for example, titanium borohydride, boron carbide Particles of titanium carbide, silicon carbide, silicon nitride, zirconium carbide, titanium nitride, molten aluminum, sintered aluminum, mullite, garnet, and print can also be used. You.

Further, as a bonding method for attaching the hard particles 6, for example, a method using an electrodeposition bond, a metal bond, a resin bond, or the like can be used.

Next, the operation of the contact terminal according to the first embodiment configured as described above will be described.

2A and 2B, when performing a charge / discharge test of the secondary battery 2, the contact terminal 3 having the hard particles 6 adhered to the contact surface and the contact not having the hard particles 6 adhered to the contact surface The electrode 1 of the secondary battery 2 is brought into sliding contact (opening / closing operation) by operating the fixed plate 5 on which the terminal 4 is supported.

The voltage between the electrodes 1 of the secondary battery 2 was detected while charging the secondary battery 2 by means of a charge / discharge test device to which the pair of contact terminals 3 and 4 facing each other was attached. The feedback control is performed so that a predetermined charging voltage is applied to the secondary battery 2 to charge and discharge. Conduct an electrical test.

On the other hand, when the charge / discharge test of the secondary battery 2 was not performed, the hard particles 6 were adhered without interposing the electrode 1 of the secondary battery 2 in the gap between the pair of contact terminals 3 and 4 facing each other. This is a high-resistance film adhered by the previous contact with the electrode 1 during the charge / discharge test of the secondary battery 2 on the contact terminal material side by directly sliding the surface and the material surface. By removing the oxide film 7, fine irregularities can be formed on the material surface.

After that, the electrode 1 of the secondary battery 2 is arranged between the pair of contact terminals 3 and 4 facing each other, and the contact terminals 3 and 4 supported on one side are brought into contact with each other, so that the contact terminal material surface side is formed. The formed fine irregularities break the oxide film 7, which is a high-resistance film adhered to the surface of the electrode 1, and thus are generated between the contact terminals 3 and 4 and the electrode 1 of the secondary battery 2. Contact resistance can be reduced.

As a result, in the contact terminal according to the first embodiment, the value of the contact resistance generated between the contact terminal and the electrode 1 of the secondary battery 2 is extended over a long period (20,000 or more times of opening and closing). , By maintaining the value close to the initial value (30 mΩ or less in this embodiment), thereby preventing overcurrent and overdischarge of the secondary battery 2 due to poor contact with the electrode 1 of the secondary battery 2. To prevent damage to the rechargeable battery 2 or to cause problems such as heat generation in the rechargeable battery 2, and to perform an accurate charge / discharge test. And

(Second embodiment)

3A to 3C are schematic diagrams showing a configuration example of a contact terminal according to the second embodiment, and the same parts as those in FIGS. 1A and 1B are the same. The description is omitted by attaching one symbol, and only different portions are described here.

That is, as shown in FIGS. 3A to 3C, the contact terminal according to the second embodiment omits the pair of opposed contact terminals 3 and 4 in FIG. 1A, and replaces this with a notch. It is composed of contact terminals 8.

The contact terminals 8 are formed by making one or more (one in this example) axial (in this example) notch in each of a pair of opposing contact terminals from the respective tips. Or it is divided into three or more divided pieces.

Further, hard particles 6 are adhered to one of the contact surfaces of the divided contact terminals into eight pieces, and the other contact surface is made of a material (such as copper) without adhering the hard particles 6. Is a copper alloy-based material).

Here, as the hard particles 6, for example, diamond, CB

It is preferable to use any one of N particles, but other than these, for example, titanium boride, boron carbide, titanium carbide, silicon carbide, silicon nitride, zirconium carbide Alternatively, particles such as titanium nitride, molten alumina, sintered alumina, mullite, garnet, and flint can be used.

As a method for attaching the hard particles 6, for example, a method using an electrodeposition bond, a metal bond, a resin bond, or the like can be used.

Next, the operation of the contact terminal according to the present embodiment configured as described above will be described. 2A and 2B, when a charge / discharge test of the secondary battery 2 is performed, the fixing plate 5 on which the pair of cut-in contact terminals 8 are supported is operated. The electrode 1 of the secondary battery 2 slides (opens and closes).

The rechargeable battery 2 is appropriately charged and discharged by the charge / discharge test device to which the pair of opposing notched contact terminals 8 is attached, and the rechargeable battery 2 is charged. Then, a voltage between the electrodes 1 of the secondary battery 2 is detected, and a charge / discharge test is performed by performing feedback control so that a predetermined charging voltage is applied to the secondary battery 2.

On the other hand, when the charge / discharge test of the secondary battery 2 is not performed, the pair of notch contact terminals facing each other are opposed to each other with the electrode 1 of the secondary battery 2 not interposed between the eight divided pieces. The contact terminals to be divided into 8 pieces of the hard particles 6 of the divided piece are directly slid in contact with the material surface, so that fine irregularities can be formed on the contact terminal material surface side.

Thereafter, the electrode 1 of the secondary battery 2 is arranged between the pair of opposing contact terminal 8-split pieces, and the contact terminal 8-split pieces supported on one side are brought into contact with each other, so that the contact terminal material surface is reduced. The minute unevenness formed on the side breaks the oxide film 7 which is a high resistance film attached to the surface of the electrode 1, and the contact resistance generated between the contact terminal 8 divided piece and the electrode 1 of the secondary battery 2 Can be reduced.

In addition, the notched contact terminal 8 having a notch allows individual absorption of the difference in the thickness of the hard particles between the hard particle adhered portion of the same contact terminal and the portion of the raw material as it is. Can be This prevents the contact surface from rising due to the adhesion of the hard particles 6 when one electrode needs to contact multiple contacts in the same space, thereby preventing a problem of contact resistance. can do.

As described above, in the contact terminal according to the second embodiment, the value of the contact resistance generated between the contact terminal and the electrode 1 of the secondary battery 2 is always maintained close to the initial value. This prevents overcurrent and overdischarge of the secondary battery 2 due to poor contact with the electrode 1 of the secondary battery 2 and damages the secondary battery 2 or causes the secondary battery 2 to malfunction due to heat generation or the like. This can prevent the occurrence of such a phenomenon, and also enables a high-precision charge / discharge test to be performed.

Furthermore, when it is necessary to contact a plurality of contacts with one electrode in the same space, it is possible to prevent the contact surface from floating due to the attachment of the hard particles 6 and to make the secondary battery 2 It is possible to prevent the problem of the contact resistance occurring between the first electrode and the first electrode.

(Other embodiments)

It should be noted that the present invention is not limited to the above-described embodiments, and can be implemented in various forms without departing from the gist of the invention in the implementation stage.

In addition, each embodiment may be implemented in combination as appropriate as possible, and in that case, the combined operation and effect can be obtained.

Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. . For example, even if some constituent elements are deleted from all the constituent elements described in the embodiments, the problems (at least one) described in the section of the problem to be solved by the invention can be solved. If the effect (at least one of the effects) described in the section of the effect of the invention can be obtained, it is possible to extract, as an invention, a configuration from which this constituent requirement has been deleted. You.

Claims

The scope of the claims

1. A pair of contact terminals arranged opposite to each other so as to be in contact with and sandwich the electrode,

A contact terminal, wherein hard particles are attached to one contact surface of the pair of opposed contact terminals, and the other contact surface is made of a material without attaching the hard particles.

2. A pair of contact terminals arranged opposite to each other so as to contact and sandwich the electrode at the center,

A cut is made in the axial direction from the tip of each of the pair of opposed contact terminals to divide the contact terminals into a plurality of divided pieces, and hard particles are attached to one contact surface of the plurality of divided contact terminal pieces. A contact terminal characterized in that the other contact surface is made of a material without adhering the hard particles.

3. At the contact terminal of claim 1 or 2,

Examples of the hard particles include diamond, CBN (Cubic Boron Nitride), carbon nitride, boron carbide, titanium carbide, silicon carbide, silicon nitride, and zirconium carbide. A contact terminal characterized by using abrasive grains for general tools, including titanium nitride, molten aluminum, sintered alumina, mullite, garnet, and print, as particles.

4. At the contact terminal of claim 1 or 2,

The contact terminal, wherein the attachment of the hard particles to the one contact surface is performed by a bonding method including an electrodeposition bond, a metal bond, and a resin bond.