JP2009054391A - Insulating material, battery pack, and method of manufacturing battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulating material, a battery pack, and manufacturing method of the battery pack, surely fixable to a prescribed position without using an adhesive material such as paste. <P>SOLUTION: Two leads 7 taken out of the vicinity of the center of a circuit board 2 are inserted into respective two holes installed in the vicinity of the center of an insulating sheet 3 to fix the insulating sheet 3 arranged between the circuit board 2 and a battery cell 1. The insulating sheet 3 has notches installed at both ends, holes for inserting the leads 7 in the vicinity of the center, a cut continuing from the hole to the outer edge of the insulating sheet 3 and installed like a polygonal line. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an insulating material, a battery pack, and a method for manufacturing the battery pack. More specifically, the present invention relates to an insulating material that insulates a battery cell from a circuit board and leads derived from the circuit board, a battery pack using the same, and a method for manufacturing the battery pack.

  In recent years, portable electronic devices such as notebook personal computers, mobile phones, and PDAs (Personal Digital Assistants) have become widespread, and lithium-ion secondary batteries having advantages such as high voltage, high energy density, and light weight are widely used as power sources. .

In the lithium ion secondary battery, an electrolyte salt such as LiPF ₆ was dissolved in a lithium composite oxide such as lithium cobalt oxide in the positive electrode, a carbon material such as graphite in the negative electrode, and a carbonate organic solvent such as ethylene carbonate and propylene carbonate. It is a secondary battery using an electrolytic solution. A lithium ion secondary battery is in the form of a battery pack in which both a battery cell and a printed circuit board on which electronic components are mounted are housed in an outer case, and is used in, for example, a notebook personal computer.

  In the battery pack, insulation is necessary to prevent a short circuit between the circuit board on which the electronic component is mounted, the battery cells, and the lead wires. If there is enough space between the circuit board and the battery cell, it can be insulated by providing a molded partition in the battery case, but in practice the space is often limited and only partially In some cases, a partition wall cannot be provided.

  In such a case, an insulating paper is disposed between the circuit board and the battery cell to insulate the circuit board from the battery cell and the lead. Insulating paper is used with an adhesive material such as glue, and is fixed to the circuit board with the adhesive material so that the position does not shift.

  FIG. 6 shows an example of a battery pack in which an insulating paper with glue is attached and fixed to a circuit board. The battery pack has a configuration in which battery cells 101 and a circuit board 102 and insulating paper 103 disposed between the battery cells 101 and the circuit board 102 are accommodated in an outer case 104. The circuit board 102 mounts an electronic component 105 such as an IC (Integrated Circuit) to form a protection circuit and a control circuit. A lead 107 connected to a tab 106 provided at an end of the battery cell 101 is led out from the circuit board 102.

  As shown in FIG. 7, the insulating paper 103 is provided with a lead escape notch at both ends and a U-shaped groove 111 for lead escape near the center, and has a paste 108 on one side thereof. . The two leads 107 led out from both ends of the circuit board 102 pass through the lead escape notches and are connected to the tabs 106. The two leads 107 led out from the vicinity of the center of the circuit board 102 pass through the lead escape groove 111 and are connected to the tab 106.

  The insulating paper 103 is fixed by being attached to the electronic component 105 mounted on the circuit board 102. In this battery pack, the insulating paper 103 prevents the battery cell 101 from coming into contact with the circuit board 102 or the lead 107, and the battery cell 101 is brought into contact with the circuit board 102 or the lead 107. Can be prevented.

  Further, for example, in Patent Document 1, as a battery pack in which an insulating paper with an adhesive material is attached to a circuit board and fixed, an outer case, a secondary battery sealed in the outer case, and a secondary battery A battery pack comprising a circuit board and a protection element for controlling charge / discharge, and a sheet-like insulating member disposed between the secondary battery and the circuit board and / or the protective element, the sheet-like insulating member comprising: There is disclosed a structure in which an adhesive layer is provided on a surface in contact with a secondary battery, and the adhesive layer is arranged in a stripe shape.

Japanese Patent Laid-Open No. 2002-237281

  However, in the case of glued insulating paper, there is a problem of sticking misalignment that sticks in a state of being deviated from a predetermined position. In addition, it is necessary to peel off the affixed insulation paper when there is a misalignment or when repairing it. However, once the affixed insulation paper is peeled off, the adhesive strength decreases, so reuse of the insulation paper It was difficult. On the other hand, the insulating paper without glue has a problem that the insulating paper tends to be displaced from a predetermined position when assembling the battery pack.

  Accordingly, an object of the present invention is to provide an insulating material, a battery pack, and a method for manufacturing the battery pack that can be securely fixed at a predetermined position without using an adhesive material such as glue.

In order to solve the above-described problem, the first invention
The insulating material is characterized in that the cuts connected to the outer edge from the hole through which the lead is inserted are provided in a shape having two or more different directions.

The second invention is
An exterior case,
A circuit board and a battery cell;
An insulating material provided between the circuit board and the battery cell, wherein the notch connected to the outer edge from the hole through which the lead led out from the circuit board is inserted has a shape having two or more different directions;
Comprising
The lead inserted through the hole is bent in a direction different from the direction of the part where the hole and the notch are connected,
The battery pack is characterized in that the insulating material is sandwiched and fixed between the bent portion of the lead and the circuit board.

The third invention is
An exterior case,
A circuit board and a battery cell;
A battery pack comprising: an insulating material provided between the circuit board and the battery cell, wherein the cuts connected to the outer edge from the holes through which the leads led out from the circuit board are inserted have shapes having two or more different directions A manufacturing method of
A battery pack manufacturing method comprising a step of inserting a lead into a hole by shifting a pair of portions separated by a cut of an insulating material so as to have an interval larger than the diameter of the lead. .

  In the first invention to the third invention, since the cuts connected to the outer edge from the hole through which the lead is inserted are provided in the insulating paper in a shape having two or more different directions, the lead inserted through the hole is an insulating material. Hard to come off.

  In the second invention, the lead inserted through the hole is bent in a direction different from the direction of the part where the hole and the notch are connected, and the insulating material is interposed between the bent part of the lead and the circuit board. Since it is fixed by being sandwiched, it is difficult for the insulating material to be displaced.

  In the third invention, the lead is inserted into the hole by shifting the pair of portions separated by the cut of the insulating material so as to have an interval larger than the diameter of the lead. Therefore, the lead is easily inserted into the hole. it can.

  In the first invention to the second invention, it is preferable that the shape having two or more different directions is a shape including a polygonal line shape from the viewpoint that the lead can be more easily removed.

  In the second invention, the direction different from the direction of the portion where the hole and the notch are connected is opposite to the direction of the portion where the hole and the notch is connected, so that the lead is more difficult to move from the hole to the notch. Therefore, it is preferable from the viewpoint that the positional deviation of the insulating paper can be made less likely to occur.

  In the second aspect of the invention, it is preferable that the exterior case has a rib for fixing the insulating material from the viewpoint that the displacement can be more reliably prevented by further fixing the insulating material with the rib.

  According to the present invention, it is possible to provide an insulating material, a battery pack, and a method for manufacturing a battery pack that can be reliably fixed at a predetermined position without using an adhesive material such as glue.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an exemplary configuration of a battery pack according to an embodiment of the present invention. For example, the battery pack is attached to a mounting portion provided in an electronic device such as a notebook personal computer, and can stably supply predetermined power to the electronic device.

  As shown in FIG. 1, this battery pack includes a battery cell 1, a circuit board 2 adjacent to the battery cell 1, and an insulating paper 3 disposed between the battery cell 1 and the circuit board 2. 4.

  The battery cell 1 is, for example, a cylindrical lithium ion secondary battery. In addition, the shape of the battery cell 1 is not limited to a cylindrical shape, and may be a square shape.

  The circuit board 2 is mounted with an electronic component 5 such as an IC to form a protection circuit and a control circuit. A lead 7 connected to a tab 6 provided at an end of the battery cell 1 is led out from the circuit board 2. The lead 7 is made of, for example, a linear conductive metal coated with an insulating resin.

  The circuit board 2 is connected to each of the three battery cells 1 connected in series via leads 7. The number of battery cells 1 is not limited to three, and may be one, two, or four or more, and a plurality of battery cells 1 may be connected in parallel.

  The insulating paper 3 is made of, for example, a sheet-like insulating material such as non-combustible paper and has a size that covers one main surface of the circuit board 2. The insulating paper 3 can prevent the battery cell 1 from coming into contact with the circuit board 2 or the lead 7, and can prevent an external short circuit of the battery cell 1 caused by the battery cell 1 coming into contact with the circuit board 2 or the lead 7.

  As shown in FIG. 2, the insulating paper 3 has notches provided at both ends, two holes 11 provided near the center, and a notch 12 connected from the hole 11 to the outer edge of the insulating paper 3.

  The notches provided at both ends of the insulating paper 3 are for lead escape, and two leads 7 led out from both ends of the circuit board 2 pass through the notches.

  Two leads 7 led out from the vicinity of the center of the circuit board 2 are inserted into the two holes 11 provided in the vicinity of the center, respectively. The inserted two leads 7 fix the insulating paper 3 disposed between the circuit board 2 and the battery cell 1.

  Specifically, for example, the two leads 7 inserted through the two holes 11 near the center are bent in a direction L different from the direction of the portion P where the hole 11 and the notch 12 are connected, as shown in FIG. The insulating paper 3 is sandwiched and fixed between the bent portion of the lead 7 and the circuit board 2.

  The lead 7 is bent in the direction L. If the lead 7 is bent in the same direction as the direction of the portion P where the hole 11 and the notch 12 are connected, the lead 7 easily moves from the hole 11 to the notch 12, and the insulating paper This is because 3 tends to shift. The direction L is opposite to the direction of the portion P where the hole 11 and the notch 12 are connected, so that the lead 7 is more difficult to move from the hole 11 to the notch 12, and the position of the insulating paper 3 is further displaced. It is preferable because it can be made difficult.

  The notch 12 is provided in a polygonal line shape. Since the broken line is a shape having two or more different directions, even if the lead 7 is displaced from the hole 11 due to vibration or the like, it is difficult to come off from the insulating paper 3. The shape of the notch 12 is not limited to a polygonal line shape, and may be any shape having two or more different directions. Examples of such a shape include a curved line, or a combination of a broken line and a curved line, and a straight line and a curved line. The shape combined with the shape is mentioned. Among them, a shape including a polygonal line is preferable because it has corners and the lead 7 is particularly difficult to come off.

  Note that the diameter of the hole 11 is defined according to the diameter of the lead 7, and for example, it is sufficient that there is some clearance for the lead 7 to pass. The notch 12 only needs to have a distance between the pair of portions divided by the notch 12 that is smaller than the diameter of the lead 7.

  The pair of parts divided by the cuts 12 of the insulating paper 3 can be shifted. For example, in the battery pack assembly process, as shown in FIG. 4, insulation is performed by turning a part of the pair of parts separated by the cuts 12 of the insulating paper 3 in the opposite direction with respect to the circuit board 2. The pair of portions divided by the cuts 12 of the paper 3 are shifted so as to have an interval larger than the diameter of the lead 7, and the lead 7 is inserted into the hole 11 through the pair of divided portions or directly. Like that. By doing in this way, the operation | work which inserts the lead | read | reed 7 in the hole 11 becomes easy.

  Similarly, when removing the lead 7 from the hole 11, similarly, the pair of portions divided by the notch 12 of the insulating paper 3 is different from the pair of portions divided by the notch 12 of the insulating paper 3 from the diameter of the lead 7. By shifting so as to have a larger interval, the work becomes easier.

  The outer case 4 is made of, for example, an insulating resin such as polycarbonate or ABS (Acrylonitrile Butadiene Styrene) resin, and has a box shape, for example. The outer case 4 may be provided with ribs 21 for fixing the insulating paper 3 as shown in FIG.

  In the battery pack in which the outer case 4 is provided with the rib 21, the insulating paper 3 is placed between the bent portion of the lead 7 and the circuit board 2 on which the electronic component 5 is mounted, and between the rib 21 and the circuit board 2. It is pinched and fixed. In the battery pack provided with the rib 21 for fixing the insulating paper 3 to the outer case 4, in addition to being fixed between the bent portion of the lead 7 and the circuit board 2, the rib 21 is sandwiched between the circuit board 2. Since it is fixing, the insulating paper 3 can be fixed more reliably.

  In the battery pack according to the embodiment of the present invention, the insulating paper 3 is provided with the notches 12 having at least two or more different shapes that are connected to the outer edge from the holes 11 through which the leads 7 are inserted. The inserted lead 7 is not easily detached from the insulating paper 3.

  In the battery pack according to the embodiment of the present invention, the lead 7 inserted through the hole 11 is bent in a direction L different from the direction of the portion P where the hole 11 and the notch 12 are connected, and the insulating paper 3 is led. 7 is sandwiched and fixed between the bent portion of the circuit board 2 and the circuit board 2, the lead 7 is less likely to be displaced from the hole 11, and the displacement of the insulating paper 3 is less likely to occur.

  Furthermore, in the battery pack according to the embodiment of the present invention, since the insulating paper 3 can be fixed at the position where the circuit board 2 and the lead 7 are connected, the positioning of the insulating paper 3 is facilitated.

  Furthermore, in the battery pack according to the embodiment of the present invention, the insulating paper 3 is fixed by sandwiching the insulating paper 3 and the circuit board 2 by utilizing the bending of the leads 7. By providing the notch 12 in a shape having two or more different directions, it is possible to easily prevent the lead 7 from coming off.

  Furthermore, in the battery pack according to the embodiment of the present invention, the notch 12 connected to the hole 11 through which the lead 7 is inserted is provided on the opposite side to the bending direction of the lead 7, thereby preventing interference between the notch 12 and the lead 7. Insulating paper 3 can be fixed to.

  Furthermore, in the battery pack according to the embodiment, the insulating paper 3 can be securely fixed at a predetermined position without an adhesive material such as glue, so that the insulating paper 3 is fixed between the circuit board 2 and the battery cell 1. Since no adhesive material is required, the cost can be reduced.

  Furthermore, since the battery pack according to the embodiment does not require an adhesive material for securely fixing the insulating paper 3 at a predetermined position, there is no misalignment during manufacture. Also, maintenance is easy, and the insulating paper 3 can be reused repeatedly after maintenance. It should be noted that conventional insulating paper with glue has been difficult to reuse because of its reduced adhesiveness when removed. For example, when inspecting when a defect occurs, it is necessary to peel off the attached insulating paper. Since the pasted insulating paper is bonded with glue, it tears when peeled off and cannot be used. Also, in order to prevent the insulating paper from being torn, it was necessary to take lead solder.

  The present invention is not limited to the above-described embodiments of the present invention, and various modifications and applications are possible without departing from the spirit of the present invention. For example, the hole through which the lead provided in the insulating paper is inserted is not limited to a round shape, and the shape is not limited as long as the lead can be inserted and there is some clearance.

  In the battery pack according to the embodiment, the example in which the cylindrical lithium ion secondary battery is used as the battery cell has been described. However, the present invention is not limited thereto, and a lithium metal battery using lithium metal as a negative electrode or nickel hydrogen Other types of battery cells such as batteries, nickel-cadmium batteries and the like may be used.

It is a basic diagram which shows an example of a structure of the battery pack by one Embodiment of this invention. It is a basic diagram which shows the structure of the insulating paper used for the battery pack by one Embodiment of this invention. It is a basic diagram for demonstrating the fixed state of the insulating paper used for the battery pack by one Embodiment of this invention. It is a basic diagram for demonstrating the manufacturing process of the battery pack by one Embodiment of this invention. It is a basic diagram which shows the structure of an example of the exterior case of the battery pack by one Embodiment of this invention. It is a basic diagram which shows the structure of an example of the conventional battery pack. It is a basic diagram which shows the structure of the insulating paper with a glue.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Battery cell 2 ... Circuit board 3 ... Insulating paper 4 ... Outer case 5 ... Electronic component 6 ... Tab 7 ... Lead 11 ... Hole 12 ... Notch 21 ···rib

Claims (7)

An insulating material, characterized in that a notch connected to an outer edge from a hole through which a lead is inserted is provided in a shape having two or more different directions. The insulating material according to claim 1, wherein the shape having two or more different directions is a shape including a polygonal line shape. An exterior case,
A circuit board and a battery cell;
An insulating material provided between the circuit board and the battery cell, wherein the notch connected to the outer edge from the hole through which the lead led out from the circuit board is inserted has a shape having two or more different directions;
Comprising
The lead inserted through the hole is bent in a direction different from the direction of the portion where the hole and the cut are connected,
A battery pack, wherein the insulating material is sandwiched and fixed between a bent portion of the lead and the circuit board. 4. The battery pack according to claim 3, wherein the shape having two or more different directions is a shape including a polygonal line shape. 4. The battery pack according to claim 3, wherein the direction different from the direction of the portion where the hole and the notch are connected is opposite to the direction of the portion where the hole and the notch are connected. 4. The battery pack according to claim 3, wherein the outer case has a rib for fixing the insulating material. An exterior case,
A circuit board and a battery cell;
An insulative material provided between the circuit board and the battery cell and provided with a shape in which a notch connected to an outer edge from a hole through which a lead led out from the circuit board is inserted has a shape having two or more different directions; A method for manufacturing a battery pack, comprising:
A battery pack comprising a step of inserting the leads into the holes by shifting a pair of portions of the insulating material separated by the notch so as to have an interval larger than the diameter of the leads. Manufacturing method.

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