JP2002367579A - Battery device and electronic equipment having battery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery device and electronic equipment having the battery device, capable of enhancing electric reliability in the case where taking out electrodes of a battery body are directly electrically joined to electrodes of a board by ultrasonic bonding. SOLUTION: This battery device has the battery body 34 arranged inside a case, taking out electrodes 50, 52 of a battery comprising the battery body 34; and the board 36 arranged inside the case. The taking out electrodes 50, 52 of the battery having a joining part for being directly electrically joined to electrodes 42, 44 of the board 36 by ultrasonic bonding, and the arranging distances of projecting parts 75 of a recessed and projecting part 73 of the joining part are made wider with approaching to the end part of a region 71 of the joining part from the center of the region 71 of the joining part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery device having a battery body disposed in a case, a battery take-out electrode formed from the battery body, and a substrate disposed in the case, and an electronic device having the battery device. It concerns equipment.

[0002]

2. Description of the Related Art Taking a mobile phone as an example of electronic equipment, a battery is detachably attached to the back of a housing of the mobile phone. The battery is supplied with power while mounted on the main body, and the battery can be charged from outside. This type of battery has a case and a battery body. The battery body is housed in a case,
The tabs of the two electrodes of the battery body are resistance-welded to the tab, which is then soldered to the substrate in the case. The soldering operation using such a tab is manually performed by an operator.

[0003]

As described above, since the electrodes of the battery main body and the substrate are electrically connected by using the tabs as the connecting members, it is difficult to reduce the size of the battery, and the soldering is difficult. There is also a problem that heat in the attaching operation affects the battery body. In order to prevent the influence of heat on the battery main body in this way, there is an attempt to directly electrically connect the electrode joint portion of the battery main body and the electrode of the substrate by, for example, ultrasonic bonding. However, the junction of the extraction electrodes of the battery body has a plurality of projections, the area of this junction is rectangular, and the arrangement of each projection is all the same. For this reason, cracks easily occur at the junction of the extraction electrode, particularly at the junction of the extraction electrode made of Al, and the extraction electrode of the battery body is peeled off from the electrode of the substrate or the extraction electrode is cracked. Problem. The reason why the joint region is rectangular in shape and the plurality of protrusions of the joint portion are formed at the same pitch is to facilitate processing of the horn and to concentrate vibration energy on each protrusion. It is. Therefore, there is a problem in that the required peel strength cannot be obtained in the joined state between the extraction electrode of the battery body and the electrode of the substrate, and the electrical connection reliability is low.
Therefore, the present invention has a battery device and a battery device that can solve the above-mentioned problems and can improve the electrical reliability when the extraction electrode of the battery main body and the electrode of the substrate are directly electrically bonded by ultrasonic bonding. The purpose is to provide electronic equipment.

[0004]

According to a first aspect of the present invention, there is provided a battery main body arranged in a case, a battery take-out electrode formed from the battery main body, and a substrate arranged in the case. A battery device, wherein the extraction electrode of the battery has a bonding portion for directly electrically bonding to the electrode of the substrate by ultrasonic bonding, and the bonding portion of the extraction electrode of the battery includes the substrate, Has an uneven portion on the side of the electrode, and the arrangement interval of the convex portions of the uneven portion of the bonding portion is increased from the center of the region of the bonding portion toward the end of the region of the bonding portion. It is a battery device characterized by the above-mentioned. According to the first aspect, the arrangement interval of the protrusions of the concave and convex portions of the joining portion of the extraction electrode of the battery becomes wider from the center of the joining portion to the end of the joining portion. Thereby, it is possible to prevent the extraction electrode from being cracked particularly at the end of the region of the joint. The reason why cracks do not occur in the extraction electrode is that the stress applied to the projection of the extraction electrode located at the outermost periphery of the joint is reduced. The denser the projections are, the more stress is concentrated and cracks are more likely to occur. Therefore,
The peel strength in the direct electrical connection between the battery take-out electrode of the battery body and the electrode of the substrate can be ensured to improve the electrical connection reliability.

According to a second aspect of the present invention, in the battery device according to the first aspect, the region of the bonding portion is rectangular, and the area of the convex portion of the uneven portion is the same. According to claim 2, even when the area of the joint is rectangular and the area of the convex part of the uneven part is the same, the arrangement interval of the convex part is from the center of the area of the joint part to the end of the area of the joint part. It gets wider as you get closer.

According to a third aspect of the present invention, there is provided a battery device having a battery body disposed in a case, a battery take-out electrode formed from the battery body, and a substrate disposed in the case. The extraction electrode of the battery has a joining portion for directly electrically joining to the electrode of the substrate by ultrasonic joining, and the joining portion of the extraction electrode of the battery has an uneven portion on the electrode side of the substrate. The arrangement interval of each convex portion of the uneven portion of the bonding portion is the same as approaching the end of the region of the bonding portion from the center of the region of the bonding portion, the The battery device is characterized in that the area of each convex portion of the concave / convex portion decreases as the distance from the center of the joint region to the end of the joint region decreases. In claim 3, the arrangement interval of the protrusions of the uneven portion of the joint is the same as approaching the edge of the region of the joint from the center of the region of the joint, and the area of the protrusion of the uneven portion of the joint is , Becomes smaller as the distance from the center of the joint region to the end of the joint region increases. Even in this case, no crack occurs in the electrode for taking out the battery from the battery body. The reason why cracks do not occur in the extraction electrode is that the larger the area of each protrusion is, the larger the stress is applied, but the closer the end is, the smaller the stress of the protrusion at the end is. It is because it can relax. Accordingly, in the case where the take-out electrode of the battery and the electrode of the substrate are directly electrically joined by ultrasonic joining, sufficient peel strength can be obtained, and electrical connection reliability can be ensured.

According to a fourth aspect of the present invention, in the battery device according to the third aspect, an end of a region of the joint is formed in a curved shape. According to claim 4, since the end of the region of the joint is formed in a curved shape, the joint length of the end is reduced, the end is not straight, and the end is formed in the longitudinal direction of the extraction electrode. Does not go straight. Cracks are less likely to occur in the extraction electrode as compared to the case where the end of the joint region is formed linearly.

According to a fifth aspect of the present invention, in the battery device according to the third aspect, an end of the region of the junction is formed in a straight line inclined with respect to a longitudinal direction of an extraction electrode of the battery. According to claim 5, when the end of the region of the joining portion is formed in a straight line inclined with respect to the longitudinal direction of the extraction electrode of the battery, the joining length of the end is increased and the longitudinal direction of the extraction electrode is increased. The joint at the end does not go straight. As compared with the case where the end of the joint area is formed in a straight line, the extraction electrode is also less likely to crack.

According to a sixth aspect of the present invention, there is provided an electronic apparatus having a battery device having a battery main body disposed in a case, a battery take-out electrode formed from the battery main body, and a substrate disposed in the case. Wherein the extraction electrode of the battery has a bonding portion for directly electrically bonding to the electrode of the substrate by ultrasonic bonding, and the bonding portion of the extraction electrode of the battery includes an electrode of the substrate. Side has a concave and convex portion, the arrangement interval of the convex portion of the concave and convex portion of the bonding portion is that it is wider from the center of the region of the bonding portion toward the end of the region of the bonding portion. An electronic apparatus having a battery device as a feature. According to the sixth aspect, the arrangement interval of the protrusions of the concave and convex portions of the joining portion of the extraction electrode of the battery increases from the center of the joining region toward the end of the joining region. Thereby, it is possible to prevent the extraction electrode from being cracked particularly at the end of the region of the joint. The reason why cracks do not occur in the extraction electrode is that the stress applied to the projection of the extraction electrode located at the outermost periphery of the joint is reduced. The denser the projections are, the more stress is concentrated and cracks are more likely to occur. Therefore, the peel strength in the direct electrical connection between the battery take-out electrode of the battery body and the electrode of the substrate can be secured, and the electrical connection reliability can be improved.

According to a seventh aspect of the present invention, in the electronic device having the battery device according to the sixth aspect, the region of the joint is rectangular, and the area of the convex portion of the concave and convex portion is the same. According to claim 7, even when the area of the joint is rectangular and the area of the convex part of the uneven part is the same, the arrangement interval of the convex part is from the center of the area of the joint part to the end of the area of the joint part. It gets wider as you get closer.

According to another aspect of the present invention, there is provided an electronic apparatus having a battery body having a battery main body disposed in a case, a battery take-out electrode formed from the battery main body, and a substrate disposed in the case. Wherein the extraction electrode of the battery has a bonding portion for directly electrically bonding to the electrode of the substrate by ultrasonic bonding, and the bonding portion of the extraction electrode of the battery includes an electrode of the substrate. Side has an uneven portion, the arrangement interval of each convex portion of the uneven portion of the joint portion is the same as approaching the end of the region of the joint portion from the center of the region of the joint portion, An electronic device having a battery device, wherein an area of each convex portion of the concave-convex portion of the joint decreases from a center of the region of the joint toward an end of the region of the joint. .
In claim 8, the arrangement interval of the protrusions of the uneven portion of the joint is the same as approaching the edge of the region of the joint from the center of the region of the joint, and the area of the protrusion of the uneven portion of the joint is , Becomes smaller as the distance from the center of the joint region to the end of the joint region increases. Even in this case, no crack occurs in the electrode for taking out the battery from the battery body. The reason why cracks do not occur in the extraction electrode is that the larger the area of each protrusion is, the larger the stress is applied, but the closer the end is, the smaller the stress of the protrusion at the end is. It is because it can relax. Accordingly, in the case where the take-out electrode of the battery and the electrode of the substrate are directly electrically joined by ultrasonic joining, sufficient peel strength can be obtained, and electrical connection reliability can be ensured.

According to a ninth aspect of the present invention, in the electronic device having the battery device according to the eighth aspect, an end of the region of the joint is formed in a curved shape. According to the ninth aspect, since the end of the region of the joint is formed in a curved shape, the joint length of the end is reduced, the end is not straight, and the end is formed in the longitudinal direction of the extraction electrode. Does not go straight. Cracks are less likely to occur in the extraction electrode as compared to the case where the end of the joint region is formed linearly.

According to a tenth aspect of the present invention, in the electronic device having the battery device according to the eighth aspect, an end of the region of the junction is formed in a straight line inclined with respect to a longitudinal direction of the battery extraction electrode. ing. According to the tenth aspect, when the end of the region of the joint is formed in a straight line inclined with respect to the longitudinal direction of the extraction electrode of the battery, the end of the region of the joint is formed in a straight line. In comparison, the joining length of the end portion is large, and the joining portion of the end portion is not perpendicular to the longitudinal direction of the extraction electrode. Again, it is difficult for the extraction electrode to crack.

[0014]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIGS. 1 and 2 show a mobile phone as an example of the electronic apparatus of the present invention. In this example, one battery device 100 is detachably mounted on the mobile phone 10.
The mobile phone 10 includes a housing 12, one battery device (battery) 100, a display unit 16, an antenna 14, and a speaker 2.
2, a microphone 20, an operation unit 18, and the like. The battery device 100 is a battery for supplying power to the mobile phone 10. The housing 12 includes a front part 24 and a rear part 2.
6. As shown in FIG. 2, a battery device 100 is detachably attached to a lower portion of the rear portion 26 and a back surface of the front portion 24. The display section 16 is a section for displaying various information, and for example, a liquid crystal display device can be used. The speaker 22 is for listening to voice, and the microphone 20 is for inputting the voice of the operator. The operation unit 18 has a numeric keypad 18C, a button 18A for making a call, a button 18B for hanging up the call, and the like.

FIG. 3 shows a structural example of the battery device 100 of FIG. The battery device 100 shown in FIG. 3 schematically includes an upper case 30, a lower case 32, a battery main body 34, a board 36, an electric connection portion 40, electrodes 42 and 44 of the board, and a label 46.
have.

FIG. 4 shows an upper case 30, a lower case 32, a battery body (also referred to as a cell) 34, a substrate 36, and an electric connection portion 4.
0, the structure of the electrodes 42, 44 of the substrate is shown in an enlarged manner. The upper case 30 and the lower case 32 are containers for accommodating the battery body 34 and the substrate 36, and are made of, for example, plastic, specifically, ABS (acrylonitrile butadiene styrene), PC (polycarbonate), PC
/ ABS (polycarbonate / acrylonitrile butadiene styrene), PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), modified P
It is made of a resin such as PE (polyphenylene ether). 3 is the outer surface 30B of the upper case 30.
The label 46 describes the characteristics of the battery device 100 and other information.

FIGS. 5A and 5B show the battery main body 34.
2 shows an example of the shape. The battery body 34 in FIG. 5 has extraction electrodes 50 and 52. The extraction electrode 50
The negative electrode is made of, for example, nickel, and the other extraction electrode 52 is a positive electrode, made of, for example, aluminum. The strength of the aluminum extraction electrode 52 is the same as that of the nickel extraction electrode 5.
0 less than the intensity. The battery body 34 is a battery that can be charged and discharged many times, such as a lithium ion battery, a lithium polymer battery, or a solid polymer battery. The battery body 34 is sealed by a case.

The substrate 36 shown in FIGS. 3 and 4 is a substrate disposed between the upper case 30 and the lower case 32.
Numeral 6 is, for example, rectangular and has a protection circuit for protecting the battery body 34, and has electrodes 42 and 44 of the substrate. The protection circuit of the substrate 36 can define an upper limit voltage during charging or a lower limit voltage during discharging for safety. The substrate 36 is made of, for example, a glass epoxy substrate, a paper phenol substrate, a flexible printed wiring board, a liquid crystal polymer substrate, a ceramic substrate, or the like.

The electrodes 42 and 44 of the substrate are electrically connected to the substrate 36 shown in FIGS. 3 and 4 by soldering, for example, by passing through a reflow furnace. The electrodes 42 and 44 of the substrate are made of, for example, a conductive metal material,
For example, it is made of a copper plate, phosphor bronze plate, beryllium copper plate, or the like, which is plated with solder, tinplate, or the like, and is a plate-shaped member as shown in FIG.

The electrode 42 of the substrate shown in FIG. 3 is located on the substrate 36 at a position corresponding to the extraction electrode 50, and the electrode 44 of the substrate is located on the substrate 36 at a position corresponding to the extraction electrode 52. is there. Thus, the extraction electrode 50 is connected to a predetermined position of the conductive pattern of the substrate 36 via the electrode 42 of the substrate, and the extraction electrode 52 is electrically connected to a predetermined position of the conductive pattern of the substrate 36 via the electrode 44 of the substrate. Connected to. The extraction electrodes 50 and 52 need to be reliably and easily electrically connected to the substrate 36 via the corresponding substrate electrodes 42 and 44 without applying heat. That is, as in the conventional case, the take-out electrode is electrically connected to the substrate side by manual soldering, so that heat is transmitted to the battery body 34 side, and the battery body 34 is damaged. Need to be avoided.

FIG. 6 shows the battery take-out electrodes 50 and 52 of the battery body 34 shown in FIG.
2, 44 are enlarged. Although FIG. 6 shows only one set of extraction electrodes and the electrodes of the substrate, they have substantially the same shape as the extraction electrodes 50 and 52, and
This is because 2 and 44 have the same shape and are omitted. Each of the extraction electrodes 50 and 52 has a joint 70 formed on one surface 51 side. The joining portion 70 is connected to the extraction electrode 50 or the extraction electrode 52 as described above.
Is formed on one surface 51, that is, the side facing the electrode 42 of the substrate or the electrode 44 of the substrate. Joint 70
Has an area 71 indicated by a dashed line. This area 7
Numeral 1 is rectangular or square in the example of FIG.

FIG. 7 is a plan view showing the electrodes 42 and 44, the extraction electrodes 50 and 52, and the joint 70 of the substrate of FIG. The joining portion 70 is electrically joined at a position facing one surface 43 of the electrodes 42 and 44 of the substrate. FIG.
7 is a modification of the embodiment shown in FIG. 7, and the joint forming area including the joint 70, that is, the pressing area 70S of the pressing part 420 of the ultrasonic vibration welding apparatus 410 described later in FIG. , 52.

FIG. 8 is a view of the extraction electrodes 50 and 52 of FIG. 6 viewed from the U direction, that is, from below, and shows one surface 51 side of the extraction electrodes 50 and 52. On this one surface 51, a configuration example of a rectangular (rectangular or square) region 71 of the joint 70 is shown. This area 71
In the figure, an uneven portion 73 is formed. This uneven part 7
In FIG. 3, a plurality of convex portions 75 as shown in FIG. 9 are arranged. As shown in FIG. 8, as the distance from the center portion 79 of the region 71 to the four end portions 81 of the region 71 increases, the arrangement interval (pitch) of the convex portions 75 gradually increases. For example, the arrangement interval P of the convex portions 75 near the central portion 79
T1 is smaller than the next arrangement interval PT2, and this arrangement interval PT2 is smaller than the next arrangement interval PT3. As described above, as the region 71 approaches the end portion 81 from the central portion 79, the arrangement interval of the convex portions 75 gradually increases.

The joining surface 85 of each projection 75 shown in FIGS. 8 and 9
Are the same in the examples of FIGS. 8 and 9. This joint surface 85 is a portion that directly contacts the electrode 42 or 44 of the substrate 36. 9A is a trapezoidal cross section, and the joining surface 85 of the convex portion 75 in FIG. 9A is a flat surface. 9B has a semicircular cross section, and the joining surface 85 projects downward in an R shape. FIG. 9 (C)
Is a square cross section, and the joint surface 75 is a flat surface. The material of the substrate 36 is, for example, PI (polyimide),
PET (polyethylene terephthalate), iron plate, ceramic, glass epoxy material, paper phenol material and the like can be used. An electrode 42 formed on the substrate 36,
44 may be formed on one side as shown in FIG. 9, may be formed on both sides, may have a through hole, or may be formed with a bump.

FIG. 10 shows that the ultrasonic vibration welding apparatus 410
An example is shown in which the extraction electrodes 50 and 52 and the electrodes 42 and 44 of the substrate 36 are ultrasonically bonded while forming a bonding portion 70. The ultrasonic vibration welding apparatus 410 shown in FIG. 10 has a pressing part 420, a fixed base 400, and an ultrasonic generation source 430. The substrate 36 is mounted on a fixed base 400. An extraction electrode 5 is provided on the electrodes 42 and 44 of the substrate 36.
0 and 52 are respectively mounted. Thereafter, the pressing portion 420 of the ultrasonic vibration welding apparatus 410 is also called a horn, and forms each convex portion 75 of the bonding portion 70 while pressing along the PS direction.
Press on 2,44. The pressing unit 420 generates vibration in the E direction, that is, in the direction orthogonal to the pressing direction PS, by the supply of the voltage from the ultrasonic wave generation source 430.

The projection 75 and the electrodes 42 and 44 can be solid-phase-bonded by applying a relatively low pressure and strong ultrasonic vibration at room temperature to rub against the welding interface, thereby applying no heat. An ideal electrical connection that is clean and free of loss can be stably performed. That is, the welding interface is rubbed, and the oxide film and the adhered impurities are mechanically cleaned, and a sudden plastic flow is generated, so that the protrusion 75 and the electrode 4
2,44 will be bound in the solid state. The projection 75 and the electrodes 42 and 44 constitute an electric connection device 600. In the case of such a bonding, since the bonding can be performed at normal temperature, no heat is applied to the extraction electrodes 50 and 52, and there is no influence of the heat on the battery body 34 shown in FIG. In addition, since it is not necessary to use a conventional elastic member such as a tab, the size of the battery and the mobile phone can be reduced, and the number of components can be reduced.

In the region 71 as shown in FIG. 8, the area of each convex portion 75 is made the same, and the arrangement interval is set at the central portion 7.
By increasing the distance from 9 to the end 81, the following advantages can be obtained. That is, in FIG. 7, there is no possibility that peeling or cracking will occur in the AL-AL line in the region 71. The reason for this is that the stress applied to the protrusion of the extraction electrode located at the outermost periphery of the joint is reduced. The denser the projections are, the more stress is concentrated and cracks are more likely to occur. From this, between the electrode of the substrate and the extraction electrode of the battery main body, it is possible to directly electrically connect, without using other parts, it is possible to prevent troubles such as peeling or cracking, and to improve the battery device. Electronic devices can be reduced in size and thickness.

Next, FIG. 11 shows another embodiment of the present invention, and FIG. 11 shows a form corresponding to FIG. In FIG. 11, the joining portion 70 has a rectangular (rectangular or square) region 71. In this area 71, an uneven portion 73 is provided. The uneven portion 73 has a plurality of convex portions 175. The projections 175 are arranged at the same arrangement interval (pitch) PT4 from the center 79 of the region 71 to the four ends 81. But the central part 7
The area of the joint surface 85 of the convex portion 175 located at 9 gradually decreases from the central portion 79 to the end portion 81. The cross-sectional shape of each protrusion 175 in FIG.
(A), (B), and (C) can be adopted, and the area of the joint surface of each convex portion 175 is the same. Even if such an arrangement format of the convex portions 175 is adopted, the AL-A in FIG.
It is possible to prevent peeling and cracking in the L line. The reason why this peeling or cracking can be prevented is that the stress applied to the protruding portion of the extraction electrode located at the outermost periphery of the joining portion is reduced. The denser the projections are, the more stress is concentrated and cracks are more likely to occur.
FIGS. 12A and 12B show still another embodiment of the present invention, in which the protrusions 175A, 175B, and 175C have smaller joining areas in this order. As shown in FIG. 12A, the joining surface 85 of each convex portion 175A, 175B, 175C
A, 85B and 85C are on the same plane.

Next, another embodiment of the present invention will be described with reference to FIGS. 13 to 18 show the region 71 of the joint 70 in a form similar to the form shown in FIG. In the embodiment of FIG. 13, the AL-AL line near the battery body has a curve 250. That is, the curve 250 forms a part of the region 71. This can also prevent peeling and cracking of the AL-AL wire. That is, the joining length of the end portion is too large, the end portion is not straight, and the joining portion of the end portion is not perpendicular to the longitudinal direction of the extraction electrode.

In the embodiment shown in FIG. 14, the AL-AL line is a chevron-shaped portion 260. Also in this case, peeling and cracking can be prevented as in FIG. That is, the joining length of the end portion is large, and the joining portion of the end portion is not perpendicular to the longitudinal direction of the extraction electrode.
In the embodiment of FIG. 15, a curve 270 is formed over the entire circumference of the area 71. This can also prevent peeling and cracking in the AL-AL line. That is, the joining length of the end portion is too large, the end portion is not straight, and the joining portion of the end portion is not perpendicular to the longitudinal direction of the extraction electrode. In the embodiment shown in FIG.
The L-AL line has a curve 280. Even in this case, peeling and cracking in the AL-AL line can be prevented. That is, the joining length of the end portion is too large, the end portion is not straight, and the joining portion of the end portion is not perpendicular to the longitudinal direction of the extraction electrode.

In the embodiment shown in FIG.
The −AL line is a straight line 290 inclined by a predetermined angle θ with respect to the longitudinal direction LL of the extraction electrodes 50 and 52. Even if the AL-AL line is formed in such an inclined state, peeling and cracking can be prevented. That is, the joining length of the end portion is large, and the joining portion of the end portion is not perpendicular to the longitudinal direction of the extraction electrode. In the embodiment of FIG. 18, the AL-AL line in the region 71 is a concave curve 299. Even in this way, peeling and cracking in the AL-AL line can be prevented.

In the embodiment shown in FIGS.
The arrangement pitch of the plurality of projections 75 arranged in one may be equal pitch or different pitch. In addition, the area of the joint surface of the convex portion 75 may be large at the center portion and small at the peripheral portion, or the area of the joint surface of each convex portion 75 may be the same. In the case where the extraction electrode is formed of Al, for example, FIG.
The arrangement interval (pitch) of the convex portions 75 of the concave and convex portions 73 shown in FIG.
mm or less. The extraction electrode is Ni
In the case of the ultrasonic bonding, the irregularities 7
The arrangement interval (pitch) of the three convex portions 75 is suitably 2 mm or less. FIG. 20 shows still another embodiment. The central convex portion 37 in the region 71 of the joint portion 70
5A has a larger formation depth than the middle convex portion 375B, and the middle convex portion 375B has a larger formation depth than the peripheral convex portion 375C. That is, the gap a of the convex portion 375A
Is smaller than the gap b of the projection 375B, and the gap b is smaller than the gap c of the projection 375C. The gap a is zero, and the gap c is smaller than the thickness WA of the substrate. In other words, the closer to the outside of the region 71, the less the crimping force by the horn (pressing portion) is applied, so that the stress at the end is relieved and the outside of the joining portion (peripheral portion) is prevented.

In the above-described embodiment, the convex portion 75 has a square shape, a rectangular shape, a circular shape, or the like. However, the shape is not limited to this, and may have an elliptical shape, a trapezoidal shape, another tapered shape, or another curvature. Of course, the shape may be acceptable.

According to the embodiment of the present invention, since the electric connection device is constituted by ultrasonic vibration, it can be joined at room temperature, and the surface can be activated by irradiating plasma with a plasma irradiator. The electrical connection reliability can be improved. Since electrical connection can be made at room temperature, heat is not transmitted to, for example, the battery body itself, and there is no fear of failure due to heat. Since electrical connection can be performed without an intervening elastic member such as a tab, electrical connection reliability can be improved, and the number of components can be reduced, so that space saving such as miniaturization and thinning can be achieved. Since electrical connection is performed using ultrasonic vibration, it is also possible to remove by applying ultrasonic vibration again after connecting once, to replace it with another one, and to connect again.

The electronic device of the present invention is not limited to a mobile phone, and requires other types of electronic devices such as a camcorder, a digital still camera, a PDA, a notebook PC portable game machine, a home video, an audio and the like. Any electronic device is acceptable. According to the embodiment of the present invention, the electrode of the substrate and the extraction electrode can be directly electrically connected by ultrasonic bonding, so that the size and thickness of the battery body and the electronic device having the battery body can be reduced. Since the electrode of the substrate and the extraction electrode are directly joined by ultrasonic joining, the reliability of the electrical joining can be improved. The projection of the extraction electrode and the electrode of the substrate can be electrically connected to each other using the projection having the optimal arrangement interval of the extraction electrodes by using ultrasonic bonding, and the extraction electrode is cracked or peeled off and the extraction electrode is formed. The occurrence of electrical disconnection can be reliably prevented. Since the ultrasonic bonding is used, the electrode of the substrate and the extraction electrode can be connected and removed at room temperature, and can be removed, and an extra member such as a tab is not required.
Cost reduction can be achieved.

[0037]

As described above, according to the present invention,
When the extraction electrode of the battery body and the electrode of the substrate are directly electrically connected by ultrasonic bonding, the electric reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a mobile phone as an example of an electronic apparatus having a battery device of the present invention.

FIG. 2 is a rear view of the mobile phone of FIG. 1;

FIG. 3 is an exploded perspective view of the battery device.

FIG. 4 is an exploded perspective view showing the vicinity of an extraction electrode of a battery device and an electrode of a substrate.

FIG. 5 is a diagram showing a battery body and a take-out electrode.

FIG. 6 is an exploded perspective view showing an extraction electrode and an electrode of a substrate.

FIG. 7 is a plan view showing an extraction electrode and an electrode of a substrate.

FIG. 8 is a diagram showing an example of a form of a bonding portion on the back surface side of an extraction electrode.

FIG. 9 is a view showing an example of a cross-sectional shape of a convex portion in the joining portion in FIG. 8;

FIG. 10 is a diagram showing a state in which an extraction electrode and an electrode of a substrate are ultrasonically bonded.

FIG. 11 is a view showing another embodiment of the joining portion of the extraction electrode of the present invention.

FIG. 12 is a view showing an example of a cross-sectional shape of a convex portion of a joining portion in FIG. 11;

FIG. 13 is a view showing another embodiment of the region of the junction of the extraction electrode of the battery device of the present invention.

FIG. 14 is a diagram showing another form of the region of the junction of the extraction electrode of the battery device of the present invention.

FIG. 15 is a diagram showing another form of the region of the junction of the extraction electrode of the battery device of the present invention.

FIG. 16 is a diagram showing another form of the region of the junction of the extraction electrode of the battery device of the present invention.

FIG. 17 is a diagram showing another form of the region of the junction of the extraction electrode of the battery device of the present invention.

FIG. 18 is a diagram showing another form of the region of the junction of the extraction electrode of the battery device of the present invention.

FIG. 19 is a view showing another form of the region of the junction of the extraction electrode of the battery device of the present invention.

FIG. 20 is a view showing another form of the region of the junction of the extraction electrode of the battery device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Cellular phone (electronic device), 34 ... Battery body, 36 ... Substrate, 42, 44 ... Electrode of substrate, 5
0, 52: extraction electrode, 70: junction of extraction electrode, 71: region of junction, 73: uneven portion of junction, 75: projection of uneven portion, 85 ..Junction surfaces of convex portions, 410 ... Ultrasonic vibration welding device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H022 AA09 BB17 CC09 CC13 5H040 AA04 AA07 AS11 AT04 AY04 CC33 DD02 DD07 DD13 DD16 DD24 NN01 NN03

Claims (10)

[Claims] 1. A battery device having a battery main body disposed in a case, a battery extraction electrode formed from the battery main body, and a substrate disposed in the case, wherein the battery extraction electrode is A bonding portion for directly electrically bonding to the electrode of the substrate by ultrasonic bonding, and the bonding portion of the battery take-out electrode has an uneven portion on the electrode side of the substrate. The battery device according to claim 1, wherein an arrangement interval of the protrusions of the concave-convex portion of the joint increases from a center of the region of the joint toward an end of the region of the joint. 2. The battery device according to claim 1, wherein a region of the bonding portion has a rectangular shape, and the area of the convex portion of the uneven portion is the same. 3. A battery device having a battery main body disposed in a case, a battery extraction electrode formed from the battery main body, and a substrate disposed in the case, wherein the battery extraction electrode is A bonding portion for directly electrically bonding to the electrode of the substrate by ultrasonic bonding, and the bonding portion of the battery take-out electrode has an uneven portion on the electrode side of the substrate. The arrangement interval of the convex portions of the concave and convex portions of the bonding portion is the same as approaching the end of the region of the bonding portion from the center of the region of the bonding portion, and each convex portion of the concave and convex portion of the bonding portion. The battery device according to claim 1, wherein an area of the portion is reduced as a distance from a center of the joint region to an end of the joint region is increased. 4. The battery device according to claim 3, wherein an end of the joint area is formed in a curved shape. 5. The battery device according to claim 3, wherein an end portion of the region of the junction is formed in a straight line inclined with respect to a longitudinal direction of an extraction electrode of the battery. 6. An electronic apparatus having a battery device having a battery main body disposed in a case, a battery take-out electrode formed from the battery main body, and a substrate disposed in the case. The extraction electrode has a bonding portion for directly electrically bonding to the electrode of the substrate by ultrasonic bonding. The bonding portion of the battery extraction electrode has an uneven portion on the electrode side of the substrate. The battery device according to claim 1, wherein an arrangement interval of the protrusions of the concave-convex portion of the joint portion increases from a center of the region of the joint portion toward an end of the region of the joint portion. Electronic equipment having 7. The electronic apparatus having the battery device according to claim 6, wherein a region of the bonding portion has a rectangular shape, and an area of the protrusion of the uneven portion is the same. 8. An electronic apparatus having a battery device having a battery main body disposed in a case, a battery take-out electrode formed from the battery main body, and a substrate disposed in the case. The extraction electrode has a bonding portion for directly electrically bonding to the electrode of the substrate by ultrasonic bonding. The bonding portion of the battery extraction electrode has an uneven portion on the electrode side of the substrate. The arrangement interval of the respective convex portions of the concave-convex portion of the bonding portion is the same as approaching the end of the region of the bonding portion from the center of the region of the bonding portion, and the unevenness of the bonding portion. An electronic device having a battery device, wherein an area of each convex portion of the portion decreases from a center of the region of the joint to an end of the region of the joint. 9. The electronic device having the battery device according to claim 8, wherein an end of the region of the joint is formed in a curved shape. 10. An electronic apparatus having a battery device according to claim 8, wherein an end of the region of the junction is formed in a straight line inclined with respect to a longitudinal direction of a lead electrode of the battery.