JPH1126029A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shield most noises with an exterior package can and a hybrid integrated circuit board and prevent the malfunctions of a protective circuit by mounting a hybrid integrated circuit board having a shield function on the back face, so that its mounting face faces the exterior package can. SOLUTION: An electrode section 60 of this battery is made into a negative electrode (or a positive electrode), and an exterior package can 63 is made into a positive electrode (or a negative electrode). The electrode section 60 and the exterior package can 63 are made of a metal, particularly a metal which allows spot welding or wire bonding. On the other hand, a hybrid integrated circuit board 62 is provided with an opening section 64 at the portion corresponding to the electrode section 60. The hybrid integrated circuit 62 is generally made of a ceramic board, a printed board, an epoxy board, a metal board or the like. Wires 66 are stuck via an insulting resin 65 to the hybrid integrated circuit board 62, if it is made of the metal board or directly stuck to the hybrid integrated circuit board 62 if it is made of an insulating board. The wires 66 are electrically connected and fixed to circuit elements, such as a semiconductor element 67 and a passive element 68.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery, and more particularly to a structure for preventing a malfunction of a charge / discharge circuit mounted on a battery and a compact mounting of the charge / discharge circuit.

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

[0005] Japanese Patent Application Laid-Open No. 08-329913 discloses 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. The body case 10 has a lid 11
A step 12 is formed in the part where the
Is attached, the end face of the main body case 10 and the lid 11
Is flattened and a beautiful rectangular solid is completed.

A pair of terminal windows 13 are opened in the lateral side plate of the main body case 10, and ribs 14 are provided in the longitudinal side plate. Of the four corners of the main body case 10, two corners on the side plate side where the ribs 14 are provided are
Are formed. The remaining two corners are almost right-angled corners. 20 is 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 part 22 is a negative electrode (or may be a positive electrode)
Thus, the outer can 21 is all a positive electrode (or may be a negative electrode). Reference numeral 23 denotes insulating paper, which has a hole so that the electrode portion 22 is exposed. Insulating paper 23 is a battery with double-sided tape etc.
Fixed to 20. This insulating paper 23 is a lead plate described later.
When the 42 is welded to the electrode section 22, the short circuit caused by the contact between the lead plate 42 and the outer can 21 is prevented.

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 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 and constitutes a protection circuit for protecting the battery from overcharge or overdischarge.

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 widths of the two substrates 30, 31 and the thermistor 35 and the insulating paper 36 are the same as the thickness of the battery 20, and when the two substrates 30, 31 and the thermistor 35 are aligned with the battery 20, It does not look out of the thickness of. Therefore, the inner dimension of the thickness of the main body case 10 is substantially
It is the same as the thickness of 20 and need not be thicker.

Reference numeral 40 denotes a first lead plate, and reference numeral 41 denotes a second lead plate. Reference numeral 42 denotes a lead plate for connecting the electrode section 22 and the thermistor 35. The first lead board 40 connects the first printed board 30 and the second printed board 31.
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 printed circuit board 30 are
The second printed circuit board 32 is arranged along the lateral sides of the longitudinal direction of the second printed circuit board. 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 is electrically connected to the battery outer can 21 via the thermistor 35 and the first printed circuit board 30. On the other hand, the lead plate 42 is electrically connected to the electrode portion 22 different from the outer can.

[0011]

However, if the printed circuit board is housed in a battery pack, the battery pack requires a corresponding amount of space and the battery pack becomes large.
In addition, since the protection circuit must be electrically and mechanically connected to the electrode terminals of the battery and the external terminals of the battery pack, there is a problem that the storage position of the printed circuit board and the arrangement of the external terminals are difficult.

When a lithium battery is used as a battery, the greatest advantages are high energy density and a high voltage, so that it can be widely used in mobile phones and notebook computers, but it has a problem in safety. It has been known. In particular, charging / discharging is a problem. In the conventional example, a thermistor is provided. In addition, ICs such as microcomputers are now mounted on the charge / discharge circuit. In particular, mobile phones and the like use frequencies in the giga order, so this high-frequency noise can enter the phone from a specific direction and cause malfunctions. There was a problem to do.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. First, a hybrid integrated circuit board having a shielding function for preventing noise from entering the back surface is provided by using any one of the above-mentioned outer cans. This can be solved by mounting it on the side.
In particular, this problem can be solved by adopting a metal substrate as a hybrid integrated circuit substrate and mounting it on a bare chip.

That is, if a metal substrate or another substrate having a shielding function is employed as the hybrid integrated circuit board, the circuit on the hybrid integrated circuit board can be shielded by disposing the board on a metal outer can. Third, a hybrid integrated circuit board disposed on a side surface of an outer can having an electrode portion and having an opening through which the electrode portion is exposed, and a hybrid integrated circuit board electrically connected to the electrode portion exposed through the opening portion This problem is solved by including the first connection means and the second connection means electrically connected to the wiring provided on the hybrid integrated circuit board and electrically connected to the outer can. . In particular, by mounting the hybrid integrated circuit board on the side surface having the electrode portion, the battery can be made compact, and by providing the opening portion in the hybrid integrated circuit board, connection with the electrode portion becomes easy, and the assembly process is simplified. Can be achieved.

Fourth, by constituting the hybrid integrated circuit board with a board having a shielding function, it is possible to prevent a malfunction due to noise in a charge / discharge circuit or the like. Fifth,
A complete mounting space is formed by a protruding portion provided to form a mounting space from the periphery of the outer can having the electrode portion and a hybrid integrated circuit board arranged such that the back surface serves as a lid of the mounting space. Since it can be realized, malfunction due to noise can be prevented.

Sixth, if the first connecting means is configured to engage with, for example, the protruding portion, the mounting space can be hermetically sealed, and bare chip mounting, noise shielding, and the like can be performed.

[0017]

The first embodiment of the present invention will be described below with reference to FIG. Reference numeral 50 indicates a schematic view of the battery, which has an outer shape in which the electrode portion 52 protrudes from the rectangular outer can 21 as in FIG. Electrode section 52
Is a negative electrode (or a positive electrode), and the outer can 51 is entirely a positive electrode (or a negative electrode).

Reference numerals 53 and 54 schematically denote a hybrid integrated circuit board on which circuits necessary for the battery 50 are mounted. The circuit is, for example, a protection circuit for charging and discharging. A feature of the present invention is that a hybrid integrated circuit board is disposed on an outer can in a direction in which noise enters, on a back surface.In order to cut off noise, a metal substrate is employed as the hybrid integrated circuit board or a shield is adopted. An insulative substrate composed of a multi-layer substrate (printed substrate, ceramic substrate, epoxy substrate, etc.) having a possible metal film adhered to the entire surface is employed. In particular, since the semiconductor element is mounted on a bare chip, a size sufficient to arrange the hybrid integrated circuit board in the outer can is sufficient.

For example, a portable telephone or the like generates noise from an internal circuit. In particular, most of the noise is determined in the direction in which the noise is generated and invaded, and the noise causes a malfunction in the circuit. For example, in some models, arrow A
The hybrid integrated circuit board 54 is provided as shown in FIG. In another model, noise enters from arrow B, so that the source of the noise is on the back side and the hybrid integrated circuit board 5 as shown in the figure.
3 is provided. As a result, the circuit mounted on the hybrid integrated circuit board is sandwiched between the outer can 51 and the hybrid integrated circuit board, and most of the noise can be cut off.

FIGS. 2 and 3 show an example of this shielding method.
The effective use of the protruding part. Hereinafter, FIG. 1, FIG. 2, and FIG. 3 will be described in order. FIG. 1 mainly shows an arrangement in which the projecting region of the electrode unit 60 is utilized.
A hybrid integrated circuit board 62 is arranged on a side surface 63 of an outer can 63 having an electrode portion 60 of a battery 61.

As described with reference to FIG. 5, the battery 60 has an outer shape in which the electrode portion 60 protrudes from, for example, a rectangular outer can 63. The electrode portion 60 is a negative electrode (or may be a positive electrode).
The outer cans 63 are all positive electrodes (or negative electrodes). The electrode portion and the outer can are made of a metal, particularly a metal capable of realizing spot welding and wire bonding.

On the other hand, the hybrid integrated circuit board 62 has a size substantially equal to or smaller than that of the side surface, and a portion corresponding to the electrode portion 60 is provided with an opening 64. The hybrid integrated circuit board here may be generally adopted as a hybrid integrated circuit device, and may be a ceramic substrate, a printed board, an epoxy board, a metal board, or the like.

A wiring 66 is adhered to the hybrid integrated circuit board via an insulating resin 65 if the substrate is a metal substrate, or a wiring 66 directly if the substrate is an insulating substrate. 68 and the like are electrically connected and fixed. Eventually, a circuit for the battery 60 is realized. For example, a charge / discharge protection circuit is configured here.

FIG. 7 is a plan view of the hybrid integrated circuit board, in which a first metal electrode 69 as a first connection means is provided so as to cross right and left of the opening 64. The electrodes are electrically connected to the wiring board of the hybrid integrated circuit board. Here, the metal electrode 69 is connected to a wiring extending close to the left and right sides of the opening 64, but is not limited thereto. It just needs to be located in this opening,
It is sufficient that the first metal substrate 69 electrically connected to the wiring of the hybrid integrated circuit board extends from one direction and extends over the electrode section 60. On the left and right sides of the hybrid integrated circuit board, second metal electrodes 70 as second connection means are provided. This may be provided only on one side or on both sides.

A feature of the present invention resides in a hybrid integrated circuit board 62 provided with the opening 64. In other words, the purpose is to connect the wiring 66 on the hybrid integrated circuit board and the electrode section 60 via the opening 64. In the drawing, a first metal electrode 69 is provided,
After setting, it is welded with a spot welder. Alternatively, the metal electrode may be omitted, and a thin metal wire may be directly bonded between the wiring and the electrode portion. Similarly, the second metal electrode 7
1 is bent downward as shown in FIG. 1 and is electrically connected to the outer can by spot welding or wire bonding. If the hybrid integrated circuit board provided with the opening is disposed on the side surface as shown in FIG. 1, it is not necessary to extend the electrode connected to the electrode portion and the outer can as shown in FIG.

The electrode of the present battery is a first metal electrode 69.
And second metal electrode 70 extended on hybrid integrated circuit substrate
Alternatively, when a main body case is employed, the electrodes attached to the main body case and the electrodes 69 and 70 are electrically connected. Further, the bare chip is sealed with a resin in order to prevent moisture resistance deterioration. Generally, it is housed in the main body case as shown in FIG. 5, but it may be omitted. In this case, the hybrid integrated circuit board and the circuit element may be sealed as shown in FIG.

Next, FIG. 2 showing a second embodiment will be described. The present embodiment has a main object of effectively utilizing a protruding region of the electrode unit 60 and shielding. Therefore, the hybrid integrated circuit substrate is made of a metal substrate or a shielded insulating substrate. Here, a metal substrate will be described. FIGS. 1 and 2 basically show a hybrid integrated circuit board 62.
This is substantially the same except that the mounting surface of is facing the side surface of the outer can. Therefore, only different parts will be described here. Since the mounting surface of the hybrid integrated circuit board 62 faces the outer can 63, the hybrid integrated circuit board 62 is covered with the sealing resin 71 in consideration of short-circuiting of the mounted components of the hybrid integrated circuit board. Naturally the electrode part 6
In order to spot weld 0 and the first metal electrode 69,
The sealing resin also has an opening corresponding to the opening 64. In wire bonding, if the first metal electrode 69 is omitted, connection is impossible. Therefore, the connection is made while leaving a part in the opening, or the first metal electrode 69 is connected to the back surface of the hybrid integrated circuit board 62. And is realized.

In the present invention, since the shield portion is provided on the entire surface of the hybrid integrated circuit board, it is possible to shield noise particularly from above or below. Further, the sealing resin 71 serves as a stopper, so that the hybrid integrated circuit board can be stably arranged on the battery. Further, a third embodiment will be described with reference to FIG. In the present embodiment, only different portions will be described.

The greatest point is the protrusion 72 provided partially around the side surface of the outer can 63 where the electrode portion 60 is located.
The protrusion 72 is formed integrally with the outer can, and the second
With the metal electrode 70. This fitting realizes electrical connection and stable arrangement of the hybrid integrated circuit board 62. Further, if the protruding portion is provided on the entire periphery of the side surface to form a mounting space, the back surface of the hybrid integrated circuit board 62 serves as a lid of the mounting space, and the space surrounded by the outer can, the electrode section, and the hybrid integrated circuit board is formed. A shield can be realized. The generated gap is completely sealed with resin or the like. If the second metal electrode is fitted over the entire circumference of the protruding portion like a tapper (trade name of tapperware) recently used in a lunch box, electrical connection and stable arrangement of the hybrid integrated circuit board can be achieved. And sealing can be realized at one time. This second metal electrode 72
The application is also possible in the case of FIG.

In all embodiments, a sealing structure as shown in FIG. 3 may be employed. In other words, a relatively hard resin is formed around the hybrid integrated circuit board and around the opening, and a resin having low thermal stress, for example, an epoxy resin containing filler is poured into a container formed by being surrounded by the resin. But it is good. The battery mounted on the hybrid integrated circuit board completed as described above is mounted on a main body case as required, and a cover is fitted thereto, thereby forming a product.

Here, as can be seen from FIG.
3 where it can come into contact with external circuits. All embodiments of the present invention may employ this structure. That is, an electrode (a plate or the like) having a polarity different from that of the electrode cap may be arranged between the terminal window and the outer can through a flexible sheet or the like having wiring. Further, the terminal window may be provided on the side surface where the electrode cap is located. In this case, FIG.
A wiring or an electrode plate having a polarity different from that of the first metal electrode 69 is disposed on the hybrid integrated circuit substrate according to the embodiment;
A terminal window may be opened in the main body case so that the electrode plate and the first metal electrode 69 are exposed. Further, in the embodiment of FIG. 2 and the embodiment of FIG. 3, electrodes (plates and wirings) of one polarity and the other polarity insulated on the back surface of the hybrid integrated circuit board so as to be exposed in the terminal window. ) May be provided.

[0032]

According to the present invention, first, the mounting surface of the hybrid integrated circuit board having the shield function on the back surface is mounted so that the outer can faces the outer can. Most noise can be cut off, and malfunction of a protection circuit such as a lithium battery can be prevented.

If a metal substrate is adopted as the hybrid integrated circuit substrate and the chip is mounted on a bare chip, it can be mounted on the side of a small area having an electrode portion, and a compact battery can be provided. Third, by employing a hybrid integrated circuit board that is disposed on a side surface of an outer can having an electrode portion and has an opening through which the electrode portion is exposed, the electrode portion and the hybrid integrated circuit board can be formed through the opening. The first metal electrode can be easily connected. In addition, the outer can can be easily connected without extending for a long time with a simple structure because most of the sides are closed. Therefore, a compact battery can be realized.

Fourth, if the hybrid integrated circuit substrate is provided with a substrate having a shielding function at the electrode portion, it is compact and can prevent malfunction of the charge / discharge circuit due to noise. Fifth, a protrusion provided to form a mounting space from the periphery of the outer can side having the electrode portion, and a hybrid integrated circuit board whose rear surface is arranged as a lid of the mounting space are completely formed. Since a compact mounting space can be realized, malfunction due to noise can be prevented.

Further, by fitting the protruding portion and the first metal electrode, electrical connection and mechanical fixing of the hybrid integrated circuit board can be realized at one time. Sixth, if the first connecting means is configured to engage with the protruding portion, for example, the mounting space can be hermetically sealed, and bare chip mounting, noise shielding, and the like can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a battery according to the present invention.

FIG. 2 is a sectional view of a battery according to the present invention.

FIG. 3 is a sectional view of a battery according to the present invention.

FIG. 4 is a sectional view of a battery according to the present invention.

FIG. 5 is an assembly view of a conventional battery.

FIG. 6 is a diagram when a battery is mounted on a main body case.

FIG. 7 is a plan view illustrating a hybrid integrated circuit board of the present invention.

[Explanation of symbols]

 50 Lithium ion battery 51 Outer can 52 Electrode 53,54 Hybrid integrated circuit board 60 Electrode 61 Battery 62 Hybrid integrated circuit board 63 Outer can 64 Opening 69 First metal electrode 70 Second metal electrode 72 Projection

Claims (6)

[Claims] 1. A battery in which an outer shape is constituted by a protruding electrode portion having a polarity and a rectangular outer can, wherein the outer can also serves as an electrode having a different polarity from the electrode portion. A battery characterized in that a hybrid integrated circuit board having a shielding function for preventing noise entering a back surface opposite to a front surface on which a circuit is mounted is mounted on any side surface of the outer can. 2. The battery according to claim 1, wherein the hybrid integrated circuit board is a metal substrate subjected to an insulation treatment, and a semiconductor element constituting the circuit is mounted on a bare chip. 3. A battery in which the outer shape is constituted by a protruding electrode portion having polarity and a rectangular outer can, wherein the outer can also serves as an electrode having a different polarity from the electrode portion. A hybrid integrated circuit board disposed on a side surface of the exterior can having an opening through which the electrode portion is exposed, and electrically connected to a wiring provided on the hybrid integrated circuit board, and A semiconductor bare chip and a passive element mounted on a circuit board, and a first electrically connected to a wiring provided on the hybrid integrated circuit board and electrically connected to the electrode part exposed from the opening. And a second connection means electrically connected to the wiring provided on the hybrid integrated circuit board and electrically connected to the outer can. 4. The battery according to claim 3, wherein the hybrid integrated circuit board on which the semiconductor bare chip is mounted is a board having a shielding function. 5. A battery in which an outer shape is constituted by a protruding electrode portion having a polarity and a rectangular outer can, wherein the outer can also serves as an electrode having a different polarity from the electrode portion. A projection provided to form a mounting space from the periphery of the side surface of the outer can having the opening, and an opening exposing the electrode portion, and a hybrid arranged so that a back surface serves as a lid of the mounting space. An integrated circuit board; a circuit element constituting the circuit for the battery mounted on the surface of the hybrid integrated circuit board; first connecting means for electrically connecting the protrusion and the circuit; and the opening A second connection means for electrically connecting the electrode unit and the circuit element to each other, the second connection unit being located in a portion of the battery. 6. The battery according to claim 3, wherein the mounting space is sealed by the first connection means and the protrusion.