JP2011009038A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack in which a battery terminal can be brought closer to equipment side as much as possible without adding a complicated work and an additional component for improving position accuracy of the battery terminal.SOLUTION: The battery pack is provided with a battery cell of flat and nearly rectangular parallelepiped shape, a protection circuit part in which an electronic component is mounted on a circuit board, a frame part of which the position facing the main surface part of the battery cell is opened and which surrounds four side parts crossing at right angles the main surface part, and a label which covers integrally the battery cell, the protection circuit part, and the frame part. A supporting structure which presses the battery cell exists at one side of the frame part.

Description

  The present invention relates to a battery pack, and more particularly to a battery pack having a battery pack frame that improves the positional accuracy of battery terminals of the battery pack.

  In the conventional battery pack, as shown in FIG. 5, the battery terminal 16 is on the protection circuit board 15, and the protection circuit board 15 is fixed by the claw 21 for fixing the protection circuit board in the frame as shown in FIG. Has been. A fixed clearance is required at the portion where the protection circuit board 15 is fixed in consideration of the dimensional variation of the claw 21 itself and the protection circuit board 15 and the fitability of the protection circuit board 15.

  As shown in FIG. 3, the battery pack is formed by attaching the insulating paper 12 to the battery cell 11 and then electrically welding the protective circuit board 15, the PTC (Positive Temperature Coefficient) thermistor 13, and the connection tab 14. The battery assembly 10 processed and assembled by such a method is surrounded by a frame and wrapped so as to be covered with a label 40 (see FIG. 4). In consideration of the dimensional variation of the battery assembly 10, the inner dimensions of the frames 2a and 2b also require a certain clearance (see FIG. 2).

  Although these clearances can be reduced, but cannot be reduced to zero, the battery terminal position of the battery pack has a degree of freedom corresponding to these clearances. It was necessary to design in consideration of the degree of freedom.

  The battery terminal on the device side to which the battery pack is attached has been designed with sufficient dimensions to accommodate the range of freedom of the battery terminal on the battery pack side. However, as the device becomes smaller, if the degree of freedom is allowed in the design of the battery terminal, the size of the device becomes limited. Therefore, as a problem of miniaturization of the device, it is necessary to improve the positional accuracy of the battery terminal and bring the device and the battery terminal of the battery pack as close as possible.

  A technique for solving such a problem is described in Patent Document 1. The battery pack described in Patent Document 1 has a frame surrounding the battery cell, the frame itself has a double structure, and a substrate storage portion that can store a protection circuit board having battery terminals is provided inside thereof. Yes.

JP 2007-250204 A

  In the technique described in Patent Document 1, since the battery terminal position of the battery pack is determined by the frame housing the protection circuit board having the battery terminal, the degree of freedom of the battery terminal position of the battery pack is limited, Accuracy can be improved. However, since the frame of the battery pack of Patent Document 1 has a double structure for housing the protection circuit board, it is necessary to process the frame itself with high accuracy. Also, the dimensions of each part of the frame must fit the size of the corresponding battery cell. Therefore, in the manufacture of the frame, there arises a problem that a great number of man-hours for complicated processing are required and the cost is increased due to additional parts.

  Therefore, an object of the present invention is to provide a battery pack that can bring the battery terminal as close to the device side as possible without adding complicated processing and additional parts for improving the position accuracy of the battery terminal, which is the problem described above. There is to do.

  The battery pack of the present invention has a flat, substantially rectangular parallelepiped battery cell, a protection circuit portion configured by mounting electronic components on a circuit board, and a position where the main surface portion of the battery cell faces, and is orthogonal to the main surface portion. A battery pack comprising a frame portion surrounding four side portions, a battery cell, a protection circuit portion, and a label that integrally covers the frame portion, wherein the battery cell is pressed against one side of the frame portion. A holding structure is present.

  The present invention improves the positional accuracy of the battery terminal and produces the effect that the device and the battery terminal of the battery pack can be brought closer as much as possible.

It is a block diagram of the battery pack of this invention. It is a block diagram of the conventional battery pack. It is an external view of a battery assembly. It is a process figure of the coating | cover with a label. It is an external view of a protection circuit part. It is the fixed arrangement | positioning figure of the protection circuit board in a flame | frame (P), and its enlarged view. It is a shape figure of a frame (C). It is a block diagram of the battery pack which shows one Embodiment (the 1) of this invention. It is a shape figure of a frame (P). It is another shape figure of a frame (C). It is a block diagram of the battery pack which shows one Embodiment (the 2) of this invention.

  The configuration of the battery pack of the present invention is shown in FIG. FIG. 1 shows a frame structure in which the battery terminal position can be fixed so that the battery terminal position of the battery pack is closest to the outer surface of the frame. With this frame structure, the battery terminal position can be fixed so as to be closest to the outer surface of the frame, even if there are variations in the dimensions of the parts used, such as the battery assembly and frame dimensions in the battery pack.

  More specifically, the frame constituting the battery pack of the present invention includes a frame (P) 2a (see FIG. 9) of the protection circuit board 15 side frame in which the terminal window 22 is present and a frame (C) on the opposite side (C). ) 2b (see FIG. 7).

  Further, the protection circuit board 15 will be described. A protection circuit for preventing overcharge or overdischarge of the battery cell 11 and a battery terminal 16 for supplying power to the outside are provided. The terminal window 22 described above is for exposing the battery terminal 16. A PTC thermistor 13 is provided on one end side of the protection circuit board 15. The PTC thermistor 13 cuts off the circuit by responding to a high resistance when the temperature of the battery cell 11 is abnormally increased.

  On the other hand, the frame (C) 2b has a holding structure 1 composed of an inclined portion for providing spring properties and a tip portion for pressing the battery assembly 10 (see FIG. 8).

  The above-described structure ensures that the battery assembly 10 is securely attached to the protective circuit board 15 side even when the dimensional clearance between the internal space surrounded by the frame (P) 2a and the frame (C) 2b and the battery assembly 10 is maximum. The frame is formed in a shape and size that is pressed inside the frame (P) 2a and does not protrude outside the frame (C) 2b even when the dimensional clearance is minimum.

  When the battery assembly 10 is assembled so as to be surrounded by the frame (P) 2a and the frame (C) 2b, the battery assembly 10 is pressed by the holding structure 1 of the frame (C) 2b. The battery terminal 16 provided on the protection circuit board 15 that constitutes the frame is the position closest to the frame (P) 2a. The battery pack 30 is configured by covering the entire frame including the frame (P) 2a and the frame (C) 2b with the label 40 while maintaining this state.

  The first effect of the present invention is that even when there is a clearance in the substrate fixing claw 21 of the frame (P) 2a, the battery terminal 16 can be kept in the state closest to the outer surface of the frame (P) 2a.

  The second effect of the present invention is that the holding structure 1 is provided in the frame (C) 2b, so that the position of the battery terminal 16 is closest to the outer surface of the frame (P) 2a without adding new parts. Can be maintained.

  The third effect of the present invention is to press the battery terminal 16 against the frame (P) 2a, so that the position of the battery terminal 16 is only the thickness of the frame (P) 2a, and the positional accuracy is improved. That is, in FIG. 6, the clearance is infinitely zero, and the terminal concave dimension is only the thickness of the frame (P) 2a.

  In the above-described embodiment, the holding structure can be arbitrarily configured in shape, number, orientation, etc., as long as the battery assembly can be reliably pressed in consideration of the dimensions of the battery assembly / frame, etc. The same effects as those of the present invention can be expected. For example, a frame (C) 2b shown in FIG. 10 is an embodiment in which inclined portions for providing spring properties are directed in opposite directions.

  In addition, the number and shape of the frame are arbitrary, taking into account the dimensions of the battery assembly, frame, etc., regardless of the shape, such as one, three or more, or a shape such as a bag or frame. The same effect can be expected if the battery assembly is securely pressed. For example, the frame 3 shown in FIG. 11 is an embodiment of a unitary frame.

  Further, if the battery assembly is securely pressed, the same effect can be expected without configuring the frame substrate fixing claw as shown in FIG.

  The battery pack of the present invention realizes further downsizing in electronic equipment using a battery as a drive source.

1 Holding structure 2a Frame (P)
2b Frame (C)
3 Frame 10 Battery Assembly 11 Battery Cell 12 Insulating Paper 13 PTC Thermistor 14 Connection Tab 15 Protection Circuit Board 16 Battery Terminal 17 Protection Circuit Component Mounting Portion 21 Claw 22 Terminal Window 30 Battery Pack 40 Label

Claims (5)

A flat, substantially rectangular battery cell;
A protection circuit configured by mounting electronic components on a circuit board;
A position where the main surface portion of the battery cell faces is opened, and a frame portion surrounding four side surfaces orthogonal to the main surface portion
A label that integrally covers the battery cell, the protection circuit portion, and the frame portion;
A battery pack comprising: a holding structure that presses the battery cell on one side of the frame portion. The battery pack according to claim 1,
The battery structure is characterized in that the holding structure is formed by processing the frame portion. The battery pack according to claim 1 or 2,
The battery pack, wherein the protection circuit unit is attached to one of the four side surfaces of the battery cell. The battery pack according to claim 3,
The battery pack according to claim 1, wherein the holding structure is present at a position facing one side of the frame portion with which the protection circuit portion is in contact. The battery pack according to any one of claims 1 to 4,
The circuit board of the said protection circuit part has a battery terminal, The battery pack characterized by the above-mentioned.

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