JP2002164029A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack capable of easily and surely attaching and detaching a circuit board in an electric connection state by an almost single operation. SOLUTION: Plural cells 1 are housed in a cell housing part 8 in a pack case 7 in a series or parallel connection state, and the circuit board 2 is housed in a board housing part 9 in the pack case 7. The other end of a connecting member 11 having one end connected to the cells 1 is electrically connected to a connecting terminal assembly 12 formed by bending and boring one conductive metal. After inserting the circuit board 2 between a guide piece 18 and a contact point terminal piece 14 of the connecting terminal assembly 12 from one end side of this circuit board, the circuit board 2 is rotated by a prescribed angle, the other end part of the circuit board 2 is detachably fitted to a locking part 7e of the pack case 7, and the circuit board 2 is held in a prescribed position. At this time, a contact point part 14a of the contact point terminal piece 14 is constituted so as to be brought into pressure contact with connecting land of the circuit board 2 by restoring force by deformation of the contact point terminal piece 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack for use in which one or more single cells are assembled and integrated in a state of being connected in series or in parallel.

[0002]

2. Description of the Related Art In recent years, in order to obtain a required voltage mainly, a plurality of unit cells are connected in series or in parallel and housed in a resin pack case and integrated into a battery pack. It is used as a drive power source for portable electrical equipment. In addition, as a single battery for a battery pack, a lithium secondary battery represented by a lithium ion secondary battery having a long life and a high energy density is often used. However, while the lithium ion secondary battery has the remarkable features as described above, it is easily charged and discharged and easily overcharged or overdischarged, and generates heat in that case.

[0003] Therefore, in a battery pack using the above-mentioned lithium ion secondary battery as a unit cell, a circuit board equipped with a control circuit for preventing overcharge and overdischarge by measuring the charge capacity and remaining discharge amount of the unit cell is provided. Have been. Further, the unit cell and the circuit board are generally housed in a sealed state in a battery housing section and a board housing section formed separately by partition walls in the pack case. This separation and storage of the unit cell and the circuit board protects the circuit board from the electrolytic solution in the event of leakage of the unit cell, prevents the occurrence of electrical short-circuit due to contact between the circuit board and the unit cell, and It is configured for the purpose of stably fixing the battery against generation of vibration and the like.

In a conventional battery pack using a lithium ion secondary battery as a unit cell, as shown in FIG. 11, a connecting piece 3a at the tip of a connecting plate 3 spot-welded to the unit cell 1 is inserted into the circuit board 2. The cell 1 and the circuit board 2 are electrically connected to each other by soldering the connection plate 3 and the circuit board 2 at both ends of a connection member 4 such as a flexible circuit board or a lead wire. Connected. Note that in FIGS. 11 and 12, the partition walls of the pack case and the like are omitted, and are simplified.

[0005]

However, in a conventional battery pack using a lithium ion secondary battery, the connection plate 3 or the connection member 4 is connected to the circuit board 2 by soldering means. There are various problems as described above. That is, since the soldering work is performed manually by a worker because it is difficult to mechanize, not only the number of work steps is increased and the manufacturing cost is increased, but also connection errors and connection failures are easily generated, Further, troubles such as generation of solder balls and burning around the control circuit of the circuit board 2 due to thermal influence or short circuit of the circuit board 2 due to a soldering iron during soldering work are likely to occur.

Further, as shown in FIGS. 11 and 12, soldering of the connection plate 3 and the connection member 4 to the circuit board 2 is intended to facilitate the soldering operation.
Since the connection piece 3a of the connection plate 3 or the connection piece 4a of the connection member 4 is inserted into the circuit board 2 and the operation is performed on the opposite side of the cell 1 in the circuit board 2, the side of the pack case to which the circuit board 2 is soldered is used. Requires a space corresponding to the amount of protrusion of the connection pieces 3a and 4a, and this dead space is a factor that hinders miniaturization and thinning of the battery pack. Further, when the circuit board 2 is removed for maintenance and inspection or replacement, soldering and soldering work are required, which increases the number of man-hours and causes the above-mentioned problem every time the soldering work is performed. There is a risk.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a battery pack which allows a circuit board to be easily and reliably attached and detached in an electrically connected state by almost one-touch operation. It is the purpose.

[0008]

In order to achieve the above object, a battery pack according to a first aspect of the present invention includes a single or a plurality of single cells stored in a battery storage section in a pack case,
A circuit board housed in a board housing portion in the pack case, formed by bending and piercing one sheet of conductive metal,
A connection terminal plate, one end of which is connected to the cell and the other end of which is electrically connected to the connection member.
After being inserted from one end side between the guide piece and the contact terminal piece of the connection terminal plate, the circuit board is rotated by a predetermined angle, so that the other end of the circuit board is engaged with the locking portion of the pack case. The circuit board is held detachably, and the contact portion of the contact terminal piece is pressed against the connection land of the circuit board by a restoring force due to deformation of the contact terminal piece. It is characterized by.

In this battery pack, the circuit board is inserted between the contact terminal piece and the guide piece and then attached by a substantially one-touch operation of rotating by a predetermined angle. Due to the pressure contact of the contact portion, the electric connection is reliably made to the unit cell via the connecting member. Therefore, in this battery pack, various problems caused by soldering in the conventional battery pack can be completely eliminated, thereby reducing the manufacturing cost and improving the connection quality, and reducing the size and thickness of the battery pack. Can be achieved. In addition, when removing the circuit board for maintenance and inspection or replacement, it is easy to turn it in the opposite direction from the installation and then pull it out with almost one-touch operation,
In addition, it can be performed quickly, and in this case, the occurrence of various problems due to soldering can be eliminated.

In the above invention, the connection terminal plate includes a connection piece to which the other end of the connection member is electrically connected, a mounting piece to the pack case, and a contact piece for positioning the circuit board in a normal mounting state. A guide piece extending at a predetermined angle with respect to the contact piece, a locking piece extending by cutting and raising a part of the contact piece and extending on the same surface with respect to the guide piece; It is formed in a curved shape and is substantially parallel to the guide piece,
And a contact terminal piece which is disposed so that the contact portion is opposed to the circuit board at an interval slightly smaller than the thickness of the circuit board, and is integrally formed, and the locking piece can be inserted into the circuit board. A hole is formed, and after inserting the circuit board between the guide piece and the contact terminal piece, the circuit board is rotated around a contact point with the contact terminal piece as a fulcrum to make contact with the contact piece. Thereby, the locking piece is inserted into the locking hole at one end of the circuit board, and the other end is removably locked to the locking portion of the pack case, and the contact portion is provided on the circuit board. It is preferable to be configured to be in pressure contact with the connection land.

Thus, although the connection terminal plate is an inexpensive one formed by simply bending and perforating one conductive metal plate, a contact terminal piece is formed on the connection land of the circuit board. The contact portions can be pressed against each other by the restoring force due to the deformation to ensure the electrical connection, and the locking pieces can be engaged in the locking holes to reliably prevent the circuit board from coming off. Can be accurately positioned and held at a predetermined position by contacting the contact piece.

Further, in the above invention, the circuit board may be arranged so as to be engaged with the connection terminal plate and the engaging portion of the pack case at both ends in an arrangement along the thickness direction of the pack case. it can. As a result, the dead space due to the mounting of the circuit board in the pack case becomes extremely small, and the overall size of the battery pack can be reduced.

[0013] A battery pack according to a second aspect of the invention is formed by bending and piercing one or a plurality of cells stored in a battery storage portion in a pack case, and one sheet of conductive metal. A plurality of connection terminal plates fixedly arranged in a line in a pack case in a state where the other ends of the respective connection members respectively connected to the respective cells are individually electrically connected; The plurality of connection lands are pressed against the pair of contact spring terminal pieces of each of the connection terminal plates individually while being held in the board storage portion in the pack case while sliding the portions into the guide grooves of the pack case. And a circuit board.

In this battery pack, the circuit board can be attached by a one-touch operation by simply pushing the circuit board while sliding the edges on both sides into the guide grooves, and a plurality of connection lands are provided for each pair of contact spring terminal pieces. The electrical connection to the cell is ensured by the pressure contact via the connecting member. Therefore, in this battery pack, various problems caused by soldering in the conventional battery pack can be completely eliminated, thereby reducing the manufacturing cost and improving the connection quality, and reducing the size and thickness of the battery pack. Can be achieved. Furthermore, when the circuit board is removed for maintenance and inspection or replacement, it can be easily and quickly performed by a one-touch operation simply by pulling out the circuit board in the opposite direction to the installation. The occurrence can be eliminated. In addition to these, the circuit board is firmly supported while the peripheral portions on both sides thereof are held in the guide grooves, so that there is an advantage that the vibration resistance and the shock resistance are remarkably improved.

In the above invention, the connection terminal plate has two mounting pieces formed by bending one conductive metal into two layers, and has a semicircular shape in which the tips of the two mounting pieces are directed outward. It is preferable that a pair of contact spring terminal pieces formed to bend into a curved shape and a connection piece that is integrally protruded from one of the mounting pieces and electrically connected to a connection member are integrally formed. .

Thus, the connection terminal plate has a required function of reliably connecting the circuit board to the unit cell via the connection member, while having an inexpensive structure in which only one conductive metal is bent. Is obtained.

In the above invention, a part of one of the mounting pieces is cut and raised in a direction perpendicular to the mounting piece on the connection terminal plate, and a pair of contact spring terminal pieces are brought into contact with a part of the pack case to form a pair. The supporting piece for supporting is integrally formed, and the end of the circuit board opposite to the end on which the connection land is formed abuts on the case cover combined with the case body of the pack case, and the connection terminal plate is formed. It is preferable to adopt a configuration in which it is prevented from being removed from the pair of contact spring terminal pieces.
Thereby, the pair of contact spring terminal pieces into which the circuit board is inserted can be stably supported by the support piece integrally formed on the connection terminal plate by simple bending means, and the circuit board is mounted on the case body. It is automatically stopped when the case cover is combined to form the pack case.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part showing a battery pack according to a first embodiment of the present invention. The pack case 7 of this battery pack is formed by combining a case body 7a and a case cover 7b, and the case body 7a and the case cover 7b are brought into contact with each other when they are combined to form a partition inside. Are formed integrally with each other.

Therefore, the inside of the pack case 7 is separated into a battery storage portion 8 and a substrate storage portion 9 which are both closed spaces by a partition wall formed by abutting partition wall portions 7c and 7d. For example, a plurality of unit cells 1 which are lithium ion secondary cells are stored in series or in parallel connection, and a circuit board 2 on which a charge / discharge control circuit and the like are mounted It is stored in the connected state. One end of a connection plate 10 is spot-welded to the electrode 1a of the unit cell 1, and one end of a lead wire 11 is connected to the other end of the connection plate 10 by soldering. The other end of the lead wire 11 is connected to a connection terminal plate 12, and the circuit board 2 is detachably attached to the connection terminal plate 12 by a substantially one-touch operation.

As shown in FIG. 2 which is a perspective view of the connection terminal plate 12, the connection terminal plate 12 is formed by bending and perforating one conductive metal plate. That is, the connection terminal plate 12 is formed by bending a single metal plate into a substantially U-shape into which the circuit board 2 can be inserted, and forming a pair of mounting pieces 13 on both sides of a lower piece thereof. A portion between the pieces 13 is cut and raised to form a contact terminal piece 14 having elasticity. Further, the connection terminal plate 12 has
A contact piece 16 is provided in parallel with the lower piece via the contact piece 7. The contact piece 16 is bent along the boundary line with the contact piece 16 and is bent.
The guide piece 1 is arranged so as to be inclined in a direction substantially parallel to
8 is formed, and a locking piece 19 that cuts and raises a part of the contact piece 16 and extends on the same surface below the guide piece 18 is formed. Furthermore, the connection terminal plate 12 has a connection piece 20 erected from an end of one (left side in FIG. 2) of the attachment piece 13 in a direction orthogonal to the end thereof.
A connecting piece 21 and a connecting piece 22 are sequentially extended at the tip of the.

The connection terminal plate 12 includes a pair of mounting pieces 13.
After the mounting projections of the case body 7a are respectively inserted from below into the mounting holes 13a provided in the case, the mounting projections are fixed to the case body 7a by crushing by caulking. The connection terminal plate 12 is connected to the lead wire 1.
The connection piece 22 is wound around the other end of the lead wire 1 and then tightened, and then connected. The connection piece 21 is wound around the core wire exposed from the lead wire 11 and then tightened and electrically connected. Have been. Thereby, the connection terminal plate 12 is electrically connected to the cell 1 via the lead wire 11. On the other hand, on the circuit board 2, a locking piece 19 of the connection terminal plate 12 is attached to an attachment-side end of an existing circuit board on which the charge / discharge control circuit of the cell 1 is mounted.
Is formed with a locking hole 2a which can be engaged.

Next, an operation of attaching and detaching the circuit board 2 in the battery pack will be described with reference to FIG.
First, when the circuit board 2 is mounted, as shown in FIG. 2A, the circuit board 2 is mounted on the contact terminal piece 14 and the guide piece of the connection terminal plate 12 from one end side provided with the locking hole 2a. Insert these as guides between them. Thereby, the insertion operation of the circuit board 2 can be performed extremely easily. The circuit board 2 is further inserted from the illustrated state of (a) until the tip of the locking piece 19 faces the locking hole 2a. At this time,
The intermediate connecting piece 17 of the connection terminal plate 12 functions as a stopper for positioning the circuit board 2 such that the leading end of the circuit board 2 is brought into contact with the locking hole 2a and the locking piece 19.

After the circuit board 2 is inserted into the connection terminal plate 12 to the position as described above, the circuit board 2 is then moved to the contact terminal strip as shown by the arrow in FIG. By pivoting downward with the contact point with 14 as a fulcrum, one end side portion is brought into contact with the contact piece 16. As a result, as shown in FIG. 3B, the circuit board 2 applies a restoring force to the connection lands (not shown) by pressing the contact terminal pieces 14 downward to bend them. The contact portion 14a is pressed into contact with the contact portion 14a to ensure electrical connection, and the locking piece 19 is engaged in the locking hole 2a to prevent the connection terminal plate 12 from coming off. At the same time, the circuit board 2
Is positioned at a predetermined relative position with respect to the connection terminal plate 12, so that the contact portion 14a of the contact terminal piece 14 reliably contacts the connection land of the circuit board 2.

Further, as shown in FIG. 1, when the circuit board 2 is rotated to the horizontal state, the other end of the circuit board 2 gets over the locking projection 7e of the case body 7a while bending it. Later, it engages releasably. As a result, the circuit board 2 has one end sandwiched between the contact terminal piece 14 and the guide piece 18 and the other end pressed against the locking projection 7e from below by a restoring force due to bending of the contact terminal piece 14. As a result, the horizontal state is reliably maintained. On the other hand, at the time of maintenance and inspection or replacement of the circuit board 2, the above operation is performed in the reverse order, so that the circuit board 2 can be very easily and quickly taken out.

Therefore, in this battery pack, the circuit board 2 can be attached by a substantially one-touch operation of inserting the circuit board 2 between the contact terminal piece 14 and the guide piece 18 and then turning it down. Due to the pressure contact of the terminal strips 14, the electrical connection to the unit cells 1 via the lead wires 11 is ensured. When the circuit board 2 is to be removed for maintenance or replacement, the other end of the circuit board 2 is lifted so as to disengage from the locking projection 7e, and then the circuit board 2 is moved to the guide piece 18. On the other hand, it can be easily and quickly performed by almost one-touch operation in which the user pivots upward to a position parallel to the contact terminal and then pulls out from between the contact terminal piece 14 and the guide piece 18. Moreover, with this battery pack,
Various problems caused by soldering in the conventional battery pack can be completely eliminated.

FIG. 4 is a longitudinal sectional view of a main part showing a battery pack according to a second embodiment of the present invention.
The same or substantially equivalent parts as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted. In this embodiment, the pack case 7 includes a case body 7a and a case cover 7.
b and the case lid 7f. In the first embodiment, the case where the circuit board 2 is horizontally arranged in the same direction as the unit cells 1 is illustrated, but in this embodiment, the circuit board 2 is arranged in the height direction of the pack case 7 orthogonal to the unit cells 1. Are located in

A connection terminal plate 23 for electrically attaching and detaching the circuit board 2 and the unit cell 1 substantially by one-touch operation includes:
As shown in FIG. 5 which is a perspective view of this, it is formed by bending and perforating one conductive metal plate. That is,
The connection terminal plate 23 is formed by bending a central portion of one metal plate into a substantially U-shape, and a mounting piece 24 to the case body 7a is formed at the central portion. One side of the mounting piece 24 (FIG. 5)
(To the right) is bent inward and then bent into a curved shape to form a contact terminal piece 27 having elasticity. On the other side of the mounting piece 24, a contact terminal piece orthogonal to the mounting piece 24 is formed. Piece 2
6. The guide piece 2 which is inclined outward substantially parallel to the base of the contact terminal piece 27 by being bent along the boundary line
8 are formed.

The connection terminal plate 23 has a guide piece 28
A locking piece 29 is extended below the guide piece 28 on the same plane by cutting and raising the lower part of the guide piece 28. The connection terminal plate 23 is formed by bending a portion of the mounting piece 24 adjacent to the contact terminal piece 27 in the orthogonal direction so that the connection piece 30 is bent.
The connecting piece 30 is provided with a connecting piece 31 and a connecting piece 32 which are sequentially extended.

In the connection terminal plate 23, the mounting projections of the case body 7a are inserted from below into the pair of mounting holes 24a provided in the mounting piece 24, and the mounting projections are crushed by caulking. Thereby, it is fixed to the case body 7a. Also, the connection terminal plate 23 is a lead wire 1
The connecting piece 32 is wound around the other end of the lead wire 1 and then tightened, and then connected, and the connecting piece 31 is wound around the core wire exposed from the lead wire 11 and then tightened to be electrically connected. Have been. Thus, the connection terminal plate 23 is electrically connected to the cell 1 via the lead wire 11. On the other hand, the circuit board 2 has a locking hole 2a into which the locking piece 29 of the connection terminal plate 23 can be engaged.

Next, an operation of attaching and detaching the circuit board 2 in the battery pack will be described with reference to FIG.
First, when the circuit board 2 is mounted, as shown in FIG. 3A, the circuit board 2 is removed from one end side where the locking hole 2a is provided in a state where the case lid 7f is removed. These are inserted obliquely between the 23 contact terminal pieces 27 and the guide pieces 28 as guides. The circuit board 2 is further inserted from the state shown in FIG. 3A to a position where the tip of the locking piece 29 faces the locking hole 2a. At this time, the base of the contact terminal strip 27 of the connection terminal plate 23 functions as a stopper for positioning the circuit board 2 such that the tip of the circuit board 2 is brought into contact with the locking hole 2a corresponding to the locking piece 29.

After the circuit board 2 has been inserted into the connection terminal board 23 to the position as described above, the circuit board 2 is then moved upward with the contact point with the contact terminal piece 27 as a fulcrum. To make contact with the contact piece 26. As a result, as shown in FIG. 6B, the connection lands (not shown) of the circuit board 2 press the contact terminal pieces 27 inward (to the right in the figure) to bend the contact terminal pieces. 27 is pressed against the contact portion 27a by the restoring force of the contact portion 27 so that the contact portion 27a is reliably electrically connected to the contact portion 27a.
And the circuit board 2 is positioned at a predetermined relative position with respect to the connection terminal plate 23, and the contact terminal pieces 27 are securely connected to the connection lands of the circuit board 2. Contact

Further, one end of the circuit board 2 is
When it is rotated to the position where it contacts with 6, the other end engages with the locking projection 7e of the case body 7a after bending over it while bending it. Thereby, the circuit board 2
One end is sandwiched between the contact terminal piece 27 and the bent portion of the guide piece 28, and the other end is pressed against the locking projection 7 e by the restoring force due to the bending of the contact terminal piece 27, thereby ensuring the reliability. It is held vertically. Finally, the opening formed by the case body 7a and the case cover 7b that are combined with each other is covered with the case lid 7f. On the other hand, at the time of maintenance and inspection or replacement of the circuit board 2, by performing the above-described operation in the reverse order, the circuit board 2 can be very easily and quickly taken out.

Therefore, in this battery pack, the circuit board 2 is connected to the contact terminal strip 27 in substantially the same manner as in the first embodiment.
It can be attached by almost one-touch operation of rotating in the upright direction after being inserted between the guide piece 28 and
The own connection land is securely electrically connected to the unit cell 1 via the lead wire 11 by the pressure contact of the contact terminal piece 27. When the circuit board 2 is removed for maintenance and inspection or replacement, the circuit board 2 is rotated so as to release the engagement between the other end of the circuit board 2 and the locking projection 7e. It can be easily and quickly performed by almost one-touch operation of pulling out from between the terminal piece 27 and the guide piece 28. In addition, in this battery pack, not only the occurrence of various problems due to the soldering in the conventional battery pack can be eliminated, but also the circuit board 2 is installed in the pack case 7 in the height direction thereof. As a result, the dead space due to the mounting of the circuit board 2 in the pack case 7 is minimized, and the overall size of the battery pack can be reduced.

FIG. 7 is an exploded perspective view showing a battery pack according to a third embodiment of the present invention. In FIG. 7, the same or substantially the same components as those shown in FIGS. The reference numerals are given and duplicate description is omitted. In this embodiment, a partition wall is formed together with a partition wall portion 7d of a case cover 7b to separate the inside of the pack case 7 into a battery storage portion 8 and a substrate storage portion 9.
On c, a plurality of (four in this embodiment, for example, four) connector-like connection terminal plates 33 are arranged in a row at a predetermined interval. In contrast, the circuit board 34 has
Four connection lands 34a are formed at positions where each connection terminal plate 33 can be individually electrically connected, and a connector 37 for external connection is fixed to one edge.

The connection terminal plate 33 is shown in a longitudinal sectional view in an attached state in FIG. 8A, a perspective view seen from above in FIG. 8B, and FIG.
Has a shape as shown in a perspective view seen from below. That is, the connection terminal plate 33 is formed by bending and perforating one rectangular conductive metal plate,
Upper and lower two mounting pieces 38, 39 are formed by being folded in two along a folding curve along the central portion in the longitudinal direction, and a pair of mounting holes 38a, 39a are formed in these mounting pieces 38, 39, respectively. It is formed in a polymerized state. Contact spring terminal pieces 40 and 41 each having a substantially semicircular cross section are integrally provided at the tip of each of the mounting pieces 38 and 39. The interval between 40a and 41a is set slightly smaller than the thickness of the circuit board 34.

A connecting piece 42 projects from the center of the bent portion, which is the boundary between the mounting pieces 38 and 39. The connecting piece 42 has a lead wire as shown in FIG. The core wire exposed from one end of 11 is electrically connected by soldering. The lower mounting piece 39 includes a connecting piece 42.
The support piece 43 is formed by cutting and raising the end on the side in the orthogonal direction. As shown in FIG. 8A, each of the connection terminal plates 33 is mounted on the partition wall portion 7c in a state where the mounting pins 7g erected on the case main body 7a are inserted into the mounting holes 38a and 39a. The fixing member 50 placed on the upper mounting piece 38 through the distal end of the mounting pin 7g is crushed by caulking to be fixed on the partition wall portion 7c.

On the other hand, as shown in FIG. 7, a plurality of cells 1 (in this embodiment, three cells are exemplified) have their connection connection pieces 44 and extraction connection pieces 47 connected to their own positive or negative. Are connected to each other in series by spot welding.
Lead wires 11 each of which is individually soldered at one end.
Are soldered individually. As a result, predetermined connection points of the three unit cells 1 connected in series are electrically connected to the four connection terminal plates 33, respectively. The three cells 1 are stored in the battery storage section 8 of the pack case 7 in the above-described connection state.

On the other hand, in the case body 7 a of the pack case 7, a pair of guide rails 48 are respectively formed on the inner surfaces on both sides corresponding to the battery housing portion 8 at intervals slightly larger than the thickness of the circuit board 34. The guide grooves 49 of the circuit board 34 are formed between the pair of guide rails 48.

When assembling the battery pack, first, each cell 1 is connected to each connection terminal plate 3 via a lead wire 11.
3 and electrically connected to each cell 1 in the connected state.
Is stored in the corresponding location of the battery storage section 8 of the case body 7a. Subsequently, the circuit board 34 is inserted into the respective guide grooves 49 from the connection lands 34a side and inserted into the respective guide grooves 49 while being slid into the portions corresponding to the board storage portions 9 of the case body 7a. Then, the connector 37 at the rear end in the entry direction is pushed down to a position corresponding to the rear end of the case body 7a.

As a result, as shown in FIG. 9 showing a longitudinal sectional view cut along the longitudinal direction of the battery pack,
Since each connection land 34a has entered along the guide groove 49, the connection land 34a surely enters between the pair of contact spring terminal pieces 40, 41 of the opposed connection terminal plate 33, and also has a pair of contact spring terminal pieces 40, 41. 41 are deformed so as to be pushed outward and expanded, respectively, and enter into the inside, and are reliably electrically connected to the pair of contact spring terminal pieces 40 and 41 by the restoring force thereof, and are simply connected via the lead wire 11. The battery 1 is electrically connected to a required connection point. Also, a pair of contact spring terminal pieces 40 and 41 into which one end of the circuit board 34 is inserted.
Is supported by a support piece 43 that contacts the side surface of the partition wall portion 7c.

Finally, the case cover 7b is attached to the case body 7
When the pack case 7 is configured by being united and fixed to a, as shown in FIG. 9, the circuit board 34 is prevented from coming off by the case cover 7b, and is a cut end view along the line AA in FIG. As shown in FIG. 10, both side edges are respectively sandwiched and fixed by a pair of guide rail portions 48, and the inner side edge portions are formed by a pair of contact spring terminal pieces 40 of the four connection terminal plates 33. At 41, it is clamped and fixed. Thus, the circuit board 34 is supported in a state where the three edges are held, so that the vibration resistance and the shock resistance are remarkably improved, and the circuit board 34 is always supported stably.

In this battery pack, the circuit board 34 can be attached by one-touch operation simply by pushing the circuit board 34 along the guide grooves 49 on both sides.
a is the lead wire 1 by pressing the contact spring terminal pieces 40 and 41.
1 to ensure reliable electrical connection to the cell 1. When the circuit board 34 is removed for maintenance and inspection or replacement, it can be easily and quickly performed by a one-touch operation simply by pulling out the circuit board 34. Therefore, in this battery pack, similarly to the first and second embodiments, not only the occurrence of various problems due to the soldering in the conventional battery pack can be completely eliminated, but also the circuit can be eliminated. Since the substrate 34 can be firmly supported as described above, there is an advantage that vibration resistance and shock resistance are remarkably improved.

[0043]

As described above, according to the battery pack of the present invention, the circuit board is inserted between the contact terminal piece and the guide piece and then rotated by a predetermined angle, or substantially one-touch operation, or both sides of the circuit board. Slide the edge of the package into the guide groove of the pack case, push it completely into the board storage section inside the pack case and store it by almost one-touch operation.The connection land on the circuit board can be Pressure contact of the contact portion or the contact portion of the contact spring terminal piece enables reliable electrical connection to the unit cell via the connecting member. Moreover, with this battery pack, various problems caused by soldering in the conventional battery pack can be completely eliminated, so that the manufacturing cost can be reduced and the connection quality can be improved. Can be achieved. In addition, when removing the circuit board for maintenance and inspection or replacement, it can be easily and quickly performed by pulling out after turning in the opposite direction to the mounting direction or simply pulling out. It is possible to eliminate various troubles caused by the attachment.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a battery pack according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a connection terminal plate in the battery pack of the embodiment.

FIG. 3A is an enlarged vertical sectional view of a main part showing a state where a circuit board is attached or detached in the battery pack of the above, and FIG. 3B is an enlarged vertical sectional view of a main part showing a mounted state of the circuit board.

FIG. 4 is a longitudinal sectional view of a main part showing a battery pack according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a connection terminal plate in the battery pack of the above.

FIG. 6A is an enlarged vertical sectional view of a main part showing a state where a circuit board is attached or detached in the battery pack of the above, and FIG. 6B is an enlarged vertical sectional view of a main part showing a mounted state of the circuit board.

FIG. 7 is an exploded perspective view showing a battery pack according to a third embodiment of the present invention.

FIG. 8 shows a connection terminal plate in the battery pack of the above battery;
(A) is a longitudinal sectional view of an attached state, (b) is a perspective view seen from above, and (c) is a perspective view seen from below.

FIG. 9 is a longitudinal sectional view of the battery pack of the above, cut along the longitudinal direction.

FIG. 10 is a sectional end view taken along the line AA of FIG. 9;

FIG. 11 is a perspective view showing a connection state between a unit cell and a circuit board in a conventional battery pack.

FIG. 12 is a perspective view showing another connection state between a unit cell and a circuit board in a conventional battery pack.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cell 2,34 Circuit board 2a Locking hole 7 Pack case 7a Case main body 7b Case cover 7e Locking projection (locking part) 8 Battery storage part 9 Board storage part 11 Lead wire (connection member) 12,23, 33 Connection terminal plate 13, 24 Mounting piece 14, 27 Contact terminal piece 14a, 27a Contact part 16, 26 Contact piece 18, 28 Guide piece 19, 29 Locking piece 20, 30 Connection piece 34a Connection land 38, 39 Mounting piece 40, 41 Contact spring terminal piece 42 Connection piece 43 Support piece 49 Guide groove

Claims (6)

[Claims] 1. A single cell or a plurality of cells stored in a battery storage section in a pack case, a circuit board stored in a substrate storage section in the pack case, and one conductive metal bent and bent. A connection terminal plate formed by punching and having one end connected to the unit cell and the other end of the connection member electrically connected to the cell; and guiding the circuit board from one end side of the connection terminal plate to the connection terminal plate. After being inserted between the contact piece and the contact terminal piece, the circuit board is rotated by a predetermined angle so that the other end of the circuit board is detachably engaged with the locking portion of the pack case, and the circuit board is detached. A battery pack, wherein the battery pack is held so that the contact portion of the contact terminal piece is pressed against a connection land of the circuit board by a restoring force due to deformation of the contact terminal piece. 2. The connection terminal plate, comprising: a connection piece to which the other end of the connection member is electrically connected; a mounting piece to the pack case; a contact piece for positioning the circuit board in a proper mounting state; A guide piece extending at a predetermined angle with respect to the contact piece, a locking piece that cuts and raises a part of the contact piece and extends on the same surface with respect to the guide piece, and a curved shape having elasticity. And a contact terminal piece disposed substantially parallel to the guide piece and arranged so that a contact portion is opposed to the contact piece at an interval slightly smaller than the thickness of the circuit board. A locking hole through which the locking piece can be inserted is formed. After the circuit board is inserted between the guide piece and the contact terminal piece, a contact point with the contact terminal piece is set as a fulcrum. The circuit board is rotated by contacting with the contact piece. The locking piece is inserted into the locking hole at one end of the package case, the other end is detachably locked to the locking portion of the pack case, and the contact portion is pressed against the connection land of the circuit board. The battery pack according to claim 1, wherein the battery pack is configured as described above. 3. The circuit board according to claim 1, wherein both ends of the circuit board are engaged with the connecting terminal plate and the locking portion of the pack case in an arrangement along the thickness direction of the pack case. 3. The battery pack according to 2. 4. A single or a plurality of cells stored in a battery storage portion in a pack case, and one conductive metal is formed by bending and piercing, and one end is connected to each of the cells. A plurality of connection terminal plates fixedly arranged in a line in the pack case in a state where the other ends of the respective connection members are individually electrically connected; And a circuit board housed in the board housing portion in the pack case while being slid to a plurality of connection lands and pressed into a pair of contact spring terminal pieces of each of the connection terminal plates so as to be individually clamped. A battery pack characterized by the following. 5. A connecting terminal plate comprising: two mounting pieces formed by bending one conductive metal into two layers; and a curved shape having a substantially semicircular shape with the tips of the two mounting pieces outward. 5. A pair of contact spring terminal pieces formed so as to be bent to one another, and a connection piece projecting integrally from one of the mounting pieces and electrically connected to a connection member, being integrally formed. Battery pack. 6. A connecting terminal plate formed by cutting and raising a part of one of the mounting pieces in a direction perpendicular to the mounting piece, and abutting against a part of the pack case to support a pair of contact spring terminal pieces. The support piece is provided integrally, and the end of the circuit board opposite to the end where the connection land is formed abuts the case cover combined with the case body of the pack case, and the connection terminal plate The battery pack according to claim 5, wherein the battery pack is prevented from coming off from the pair of contact spring terminal pieces.