JP2000114697A - Mounting substrate and battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the risk of causing short circuits at the time when lead- out wires are to be soldered to a pair of lead-out electrodes. SOLUTION: In a mounting substrate 51 separating walls 62 are formed on the substrate 51 by molding a resin so as to separate paired lead-out electrodes 57 and 58 from each other by utilizing the resin molding technique which is effective to prevent the occurrence of failures when liquid leakage occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting board and a battery, and more particularly, to external mounting on a pair of external extracting electrodes of a mounting board for preventing malfunction of a charging / discharging circuit mounted on the battery. It is intended to simplify the mounting work when soldering the wire.

[0002]

2. Description of the Related Art In recent years, various electronic devices have been reduced in size and weight, and a large number of devices that are light and easy to carry even when they are carried have been commercialized. A battery is used for portable equipment because commercial AC cannot be used as a power source for driving. As the battery to be used, a battery having a high energy density that can withstand continuous use for a long time and discharge by a large current is desired.

[0003] Therefore, a pack battery in which a plurality of secondary batteries such as a nickel-cadmium battery and a nickel-hydrogen battery are combined has been widely used. The secondary battery can be repeatedly used by charging and discharging, and a high-voltage or high-capacity power supply can be easily obtained by combining a plurality of the secondary batteries. Further, when the battery packs are combined, the shape is matched to the shape of the battery mounting portion of the electric device, whereby a battery pack suitable for the device can be formed.

[0004] Recently, lithium ion batteries having higher energy density than nickel-cadmium batteries have been developed. However, since a lithium ion battery is liable to be deteriorated when overcharged or overdischarged, a protection circuit for preventing overcharge or overdischarge is required.

[0005] Therefore, in a battery pack containing a lithium ion battery, a printed circuit board or the like constituting a protection circuit is housed together with the battery.

[0006] Japanese Patent Application Laid-Open No. 08-329913 describes the above matters in detail.
This will be described with reference to FIGS. 10 is a box-shaped main body case, and 11 is a lid. The body case 10 and the lid 11 constitute the outer shape of the battery pack. Body case 10
Has a step portion 12 formed in a portion to which the lid 11 is attached, and by attaching the lid 11 thereto, the end face of the main body case 10 and the lid 11 become flat to complete a clean rectangular parallelepiped outer shape. .

A pair of terminal windows 13 are opened in the lateral side plate of the main body case 10, and a rib 1 is formed in the longitudinal side plate.
4 are provided. Of the four corners of the body case 10, two corners on the side of the side plate where the ribs 14 are provided are provided with reverse storage preventing portions 15. The remaining two corners are almost right-angled corners. Reference numeral 20 denotes a prismatic lithium ion battery. The battery 20 has an outer shape in which an electrode portion 22 protrudes from a rectangular outer can 21. The electrode portion 22 is a negative electrode (or a positive electrode), and the outer casing 21 is all a positive electrode (or a negative electrode). Reference numeral 23 denotes insulating paper, which has a hole so that the electrode portion 22 is exposed. The insulating paper 23 is fixed to the battery 20 with a double-sided tape or the like. This insulating paper 23 is used to connect a lead plate 42 (described later) to the electrode portion 2.
2 prevents the short circuit due to the contact between the lead plate 42 and the outer can 21 when welding is performed.

Reference numeral 30 denotes a first printed board, and 31 denotes a second printed board. Each of the two printed boards 30 and 31 has an elongated plate shape, and a circuit element 33 is mounted on a central portion of the first printed board 30 excluding an end region 32. As for the circuit element 33, a tall element and a short element are mixed, and there is a slight space between each element.
The circuit element 33 is connected to the lithium-ion battery 20 to form a protection circuit for protecting the battery from overcharging and overdischarging. In addition, each printed circuit board is also collectively referred to as a mounting board.

Reference numeral 35 denotes a thermistor whose resistance value changes in accordance with a change in temperature. The thermistor 35 is connected in series with the battery 20 to prevent an excessive current from flowing through the battery 20. The thermistor 35 is insulated from the battery outer can 21 by insulating paper 36. The insulating paper 36 is fixed to the thermistor 35 with a double-sided tape.

The two substrates 30, 31 and the thermistor 3
5 and the width of the insulating paper 36 are the same as the thickness of the battery 20, and the substrates 30, 31 and the thermistor 35 are
Is not viewed from the thickness of the battery 20. Therefore, the inner dimension of the thickness of the main body case 10 is substantially the same as the thickness of the battery 20, and it is not necessary to further increase the thickness.

Reference numeral 40 denotes a first lead plate, and reference numeral 41 denotes a second lead plate. 42 is the electrode section 22 and the thermistor 3
5 is a lead plate for connecting the lead plate 5 to the lead plate 5. First lead plate 40
Are a first printed circuit board 30 and a second printed circuit board 31
And are connected. The second lead plate 41 connects the second printed circuit board 31 and the battery outer can 21. With these lead plates, the thermistor 35 and the first
And the second printed circuit board 31 is disposed along the side surface in the lateral direction of the battery 20. Then, the second lead plate 41 is further bent and connected to the outer can 21 on the side facing the first printed circuit board 30.

The lead plate 41 includes a thermistor 35,
It is electrically connected to the battery outer can 21 via the first printed board 30 and the second printed board 31. On the other hand, the lead plate 42 is electrically connected to the electrode portion 22 different from the outer can.

[0013]

Here, a printed circuit board on which circuit elements and the like as the protection circuit are mounted,
As shown in FIG. 1, a pair of external extraction electrodes 57 and 58 to which external extraction lines 59 and 60 are attached are provided.
External extraction lines 59, 60 are connected to the external extraction electrodes 57, 58, respectively.
Are soldered. At this time, a pair of external extraction electrodes 5
Careful attention was required to prevent short circuit between 7,58.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mounting board and a battery that suppress the risk of occurrence of a short circuit between a pair of external extraction electrodes.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. First, the present invention utilizes a resin molding technique which is effective in preventing a failure at the time of liquid leakage, and uses a pair of resin molding techniques on a mounting substrate 51. This problem is solved by forming the separation wall 62 by resin molding so as to separate the external extraction electrodes 57 and 58.

Second, a pair of external extraction electrodes 57, 58
This problem can be solved by forming the slit 70 on the mounting substrate 51A on which the pair of external extraction electrodes 57 and 58 are separated.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.

The battery to which the present invention is applied is shown in FIGS.
Similarly to the above, the outer shape of the rectangular outer can 21 is such that the electrode portion 22 protrudes, and the electrode portion 22 is a negative electrode (or a positive electrode).
1 are all positive electrodes (or negative electrodes). A mounting board such as a printed board 31, 31, a ceramic board, a metal board, or a flexible board is mounted on the surface of the outer can 21, and a lead plate made of Ni extending from the mounting board is mounted on the outer can. 21 and the electrode portion 22 are welded by a spot welder or the like.

Hereinafter, the mounting board 51 to which the lead plate 50 is attached will be described with reference to FIG. First, the material of the mounting substrate 51 is preferably an insulating material itself, such as a printed circuit board, a ceramic substrate, and a flexible sheet. However, a metal substrate may be used as long as an insulating sheet is interposed between the outer can and the mounting substrate. In the case of a metal substrate, the effect is great if the mounting surface and the outer can face each other and the back surface is oriented so as to face the external atmosphere because the metal substrate itself shields external noise. In addition, even if heat is generated in a circuit mounted thereon, the metal substrate functions as a heat radiating substrate or a heat sink, and also has an effect of preventing ignition.

A pattern 52 (wiring, solder pad, bonding pad, etc.) made of copper foil is formed on the mounting substrate 51, and an active element (here, I
Semiconductor elements such as C and discrete elements 53 and passive elements (here, chip capacitors, chip resistors, etc.) 54 are electrically connected. These constitute a protection circuit that protects the battery from overcharge and overdischarge. 57,
Reference numeral 58 denotes a pair of external extraction electrodes to which external extraction lines 59 and 60 as charge / discharge lines are connected by soldering.

In addition, around the mounting substrate 51, Ni
Is connected to the pad electrode 55 by solder 56.

Then, as shown in FIG.
A region other than the pair of external extraction electrodes 57 and 58 on the first member 1 is resin-molded 61 to take measures against liquid leakage. Here, as shown in FIG. 2, a separation wall 62 formed by resin molding is also formed between adjacent external extraction electrodes 57 and 58 so as to separate the pair of external extraction electrodes 57 and 58, which is a feature of the present invention. ing.

Thus, the pair of external extraction electrodes 5
The formation of the separation wall 62 for separating the external extraction electrodes 57 and 58 allows the external extraction lines 57 and 58 to be connected to the external extraction electrodes 57 and 58.
The risk of occurrence of a short circuit when soldering and connecting 60 is suppressed, and workability is improved.

FIG. 3 shows another embodiment of the present invention.
This will be described based on FIG.

Another feature of the embodiment shown in FIG. 3 is that a mounting substrate 51A on which a pair of external extraction electrodes 57 and 58 is formed.
A slit 70 is formed so as to separate the external extraction electrodes 57 and 58 from each other.

As described above, the pair of external extraction electrodes 5
Since the slits 70 are formed so as to separate the electrodes 7 and 58 from each other, the danger of a short circuit occurring when the external extraction wires 59 and 60 are connected to the external extraction electrodes 57 and 58 by soldering is suppressed, and work is performed. Becomes better.

Also, the pair of external extraction electrodes 57, 5
The space for securing a sufficient space between the mounting boards 5
In this case, the separation wall 62 formed by resin molding as in one embodiment or the slit 70 as in another embodiment may not be employed. When a pair of external extraction electrodes 57 and 58 are arranged obliquely. The distance between the two can be further increased, and the effect is great.

Further, as shown in FIG.
By forming a pad electrode 55 to which is adhered on the back surface of the mounting substrate 51 (the surface on which the circuit element is not mounted), the above-described method of widening the interval between the pair of external extraction electrodes 57 and 58 is effective even when the mounting substrate 51 is used. The problem of reduced space can be solved.

The pair of external extraction electrodes 5
Even in the case where the space between 7, 58 is ensured, the structure employing the separation wall 62A by the resin mold 61 as in the embodiment described above as shown in FIG. 5 and the other embodiment as described above as shown in FIG. It is good also as composition which adopted slit 70A like this.

The battery in which the completed mounting board is attached to the outer can is mounted on a main body case as required, and a cover is fitted to the battery, thereby forming a product.

[0031]

According to the present invention, first, a separation wall is formed by a resin mold so as to separate a pair of external extraction electrodes on a mounting board by utilizing a resin molding technique as a measure against liquid leakage. Thereby, the danger of a short circuit occurring at the time of soldering and connecting the external extraction wire to the external extraction electrode is suppressed, and workability is improved.

Second, by forming a slit on the mounting substrate on which the pair of external extraction electrodes are formed so as to separate the pair of external extraction electrodes, an external extraction line is connected to the external extraction electrodes by soldering. The risk of occurrence of a short circuit is suppressed, and workability is improved.

Furthermore, if the pad electrode to which the lead plate is adhered is formed on the back surface of the mounting substrate, a space for sufficiently widening the space between the pair of external extraction electrodes can be secured, and the external extraction lines can be soldered to the external extraction electrodes. The risk of occurrence of a short circuit at the time of connection is suppressed, and workability is improved.

[Brief description of the drawings]

FIG. 1 is a view of a mounting board attached to a battery of the present invention.

FIG. 2 is a view showing a state in which the mounting board of FIG. 1 is resin-molded.

FIG. 3 is a view showing a state in which a slit is formed in a mounting board according to another embodiment of the present invention.

FIG. 4 is a view showing a state in which a distance between a pair of external extraction electrodes formed on a mounting board according to another embodiment of the present invention is widened.

FIG. 5 is a diagram showing a state in which the mounting board of FIG. 4 is resin-molded.

FIG. 6 is a view showing a state in which a slit is formed in a mounting board according to another embodiment of the present invention.

FIG. 7 is an assembly view of a conventional battery.

FIG. 8 is a diagram when a battery is mounted on a main body case.

[Explanation of symbols]

 50 Ni lead plate 51 Mounting board 51A Mounting board 52 Conductive pattern 53 Active element 54 Passive element 55 Pad electrode 57, 58 A pair of external extraction electrodes 59, 60 A pair of external extraction lines 61 Resin mold 62 Separation wall 62A Separation wall 70 Slit 70A slit

Claims (4)

[Claims] 1. A mounting device comprising: a pad electrode provided on a front surface (or a back surface of a mounting substrate) on which a circuit element is mounted; and a lead plate connected to the pad electrode, wherein the circuit element and the like are mounted. Separation walls are formed by resin molding so that adjacent external extraction electrodes are separated from each other on a mounting substrate in which regions other than a pair of external extraction electrodes on the substrate surface (or the back surface of the mounting substrate) are resin-molded. A mounting board characterized by the above-mentioned. 2. The mounting device according to claim 1, further comprising a pad electrode provided on a front surface (or a back surface of the mounting substrate) of the mounting substrate on which the circuit element is mounted, and a lead plate connected to the pad electrode, wherein the mounting device includes the circuit element and the like. In a mounting board in which a region other than a pair of external extraction electrodes on the substrate surface (or the back surface of the mounting substrate) is resin-molded, the mounting of a portion where the external extraction electrodes are adjacent to each other so as to separate adjacent external extraction electrodes. A mounting substrate, wherein a slit is formed in the substrate. 3. A protruding electrode portion having a polarity; a rectangular outer can serving as an electrode having a polarity different from that of the electrode portion; and a circuit element for a battery, which is disposed on the surface of the outer can and mounted thereon. A battery having a mounting substrate in which regions other than a pair of external extraction electrodes are resin-molded, wherein a separation wall formed by resin molding is formed so as to separate adjacent external extraction electrodes. . 4. A protruding electrode portion having a polarity, a rectangular outer can that serves as an electrode having a different polarity from the electrode portion, and a circuit element for a battery, which is disposed on a surface of the outer can and is mounted. In a battery having a mounting substrate formed by resin molding in a region other than the pair of external extraction electrodes, a slit is formed in the mounting substrate at a position where the external extraction electrodes are adjacent so as to separate adjacent external extraction electrodes. A battery characterized in that: