JP2005317460A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack in which further downsizing and reduction of assembling man-hours are promoted by simplifying a constitution of the battery pack. <P>SOLUTION: The battery pack is equipped with: a battery block grouping; a lead plate 240 that makes a lead protrusion part which detects intermediate temperature of the battery grouping protrude; a circuit plate board arranged almost in parallel with a first face of the battery block grouping, and electrically connected to the lead plate 240; and a plate board lead part 830 that electrically connects the circuit plate board and the lead plate 240. Furthermore, a plate board holder 610, retaining the circuit plate board, facing the first face on which, the lead protrusion part is made to protrude, is arranged to the battery pack. Hence, wiring with lead wires becomes unnecessary by arranging the circuit plate board so that it faces the protruding face of the lead protrusion part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a battery pack mainly suitable for discharging a large current, and more particularly to a battery pack in which a plurality of batteries are connected in parallel and / or in series.

  The battery pack can increase the output current by increasing the number of batteries connected in parallel, and can increase the output voltage by increasing the number of batteries connected in series. Since the battery pack with this structure contains a large number of batteries, it is important to have a structure in which each battery can be connected efficiently. As a battery pack for realizing this, a battery pack in which the battery is connected with a lead plate having a unique structure has been developed (see, for example, Patent Document 1). Also, in battery packs used in applications requiring high output, such as bicycles, tools, automobiles, etc., there is a structure in which a plurality of batteries are connected in parallel and further connected in series to increase the output. Can take.

Along with the increasing demand for such battery packs, improvements such as reduction in the number of parts and simplification of assembly steps are required for further downsizing and thinning. In the conventional battery pack, a double structure in which an inner case for housing the battery is disposed inside the outer case is used to protect the battery. In addition, lead wires have been used for wiring the battery housed in the inner case and the circuit board. Such a structure is complicated, and there is a problem that the number of assembly steps is very large.
JP-A-10-308205

  The present invention has been made to further solve such problems. A main object of the present invention is to provide a battery pack in which the structure of the battery pack is simplified to further reduce the size and reduce the number of assembly steps.

  In order to achieve the above object, a battery pack according to the present invention includes a plurality of batteries extending in a first direction, arranged in parallel with each other in the vicinity of each other, and perpendicular to the first direction. A battery block assembly in which end faces of the battery are arranged in a straight line substantially in the same plane along the second direction, and are stacked in a third direction perpendicular to the first direction, and a battery block assembly In order to connect a plurality of batteries included in the battery in parallel and in series in a predetermined pattern, the battery is joined to adjacent batteries at the end face of the battery to electrically connect them, and parallel to the first direction and the second direction. A lead plate for projecting a lead projecting portion capable of detecting an intermediate voltage of the battery block assembly on the first surface of the battery block assembly, and a lead plate disposed substantially parallel to the first surface of the battery block assembly A circuit board electrically connected to the board, and a circuit board And a substrate lead portion electrically connecting the lead plate and. Furthermore, this battery pack has a substrate holder for holding the circuit board facing the first surface from which the lead protruding portion of the battery block assembly is protruded. As a result, the circuit board is disposed so as to face the protruding surface of the lead protruding portion, thereby eliminating the need for wiring by the lead wire.

  In another battery pack of the present invention, the circuit board has a width in the first direction shorter than the length in the first direction of the battery, and the board holder holds the circuit board so as to surround the circuit board. The rib is provided, and the flange portion is protruded from the side surface of the substrate holder rib in the first direction. The flange extends along the second direction to open a lead slit for inserting the lead protrusion, and the lead protrusion inserted in the lead slit and the circuit board are electrically connected by the board lead portion. The substrate lead portion has a substrate lead horizontal portion parallel to the first surface, a substrate lead chevron portion straddling the substrate holder rib, and the substrate lead horizontal portion inserted into the lead slit, The lead protrusion and the substrate lead are electrically connected by contact. Thereby, since the circuit board can be disposed between the lead plates sandwiched from both end faces of the battery, the wiring between the circuit board and the battery can be simplified, and the circuit board can be further downsized as the circuit board becomes smaller. In addition, the battery block assembly and the circuit board can be insulated from each other by the collar part, and further, it can be used as a connection part between the lead plate and the board lead part.

  Furthermore, in another battery pack of the present invention, the substrate lead portion is formed by bending a flat plate, and the substrate lead horizontal portion is formed with a substrate lead horizontal hole into which the lead protrusion is inserted. A lead insertion part is formed at the tip of the lead, and the lead protrusion and the board lead part are electrically connected by inserting the lead insertion part into the board lead horizontal hole. Thereby, the electrical connection between the battery and the circuit board can be obtained by mechanical connection between the leads without using a lead wire.

  Furthermore, in another battery pack according to the present invention, the substrate lead portion has a shape in which a wire is bent, the lead protrusion has a lead groove formed at the tip, and the tip of the wire of the substrate lead portion is formed in the lead groove. By inserting, the lead protrusion and the substrate lead are electrically connected. Thereby, the electrical connection between the battery and the circuit board can be obtained by mechanical connection between the leads without using a lead wire.

  Furthermore, in another battery pack according to the present invention, the substrate lead chevron forms a U-shaped clinch. As a result, the effect of absorbing vibrations and shocks by clinching can be obtained, and the situation where the electrical contact of the lead plate is interrupted by vibrations can be avoided.

  Furthermore, in the other battery pack of the present invention, the substrate holder rib forms a stepped portion for inserting the substrate lead chevron. As a result, the board lead chevron can be easily positioned by being fitted into the stepped portion, and can be stably held so as not to be displaced.

  Furthermore, another battery pack according to the present invention includes an inner case into which a battery block assembly is inserted. The inner case is divided into an upper inner case and a lower inner case, and the upper inner case has a substrate holder on the upper surface. The lower inner case is formed in a box shape having an opening on one side, and the battery block assembly connected to the substrate holder is inserted into the opening, and the opening is closed with the substrate holder. As a result, the battery block assembly is housed in the inner case, and is protected from vibrations and impacts, and at the same time, an insulation and waterproof effect can be obtained.

  According to the above-described battery pack of the present invention, a simpler configuration with a greatly reduced number of parts is obtained, and extremely excellent effects of cost reduction and assembly man-hour can be obtained while realizing downsizing. In particular, according to the present invention, the lead projecting portion for wiring the battery lead plate is drawn out to one surface of the battery block assembly, and the circuit board is arranged on this surface to eliminate the need for wiring by the lead wire. The connection enables electrical connection between the battery and the circuit board. Further, by not using the inner case, further simplification of the configuration can be obtained, and it can be used as a next-generation pack battery that can greatly contribute to reduction in size, thickness, weight, and cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack as follows.

Further, the present specification by no means specifies the members shown in the claims to the members of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the embodiments are not intended to limit the scope of the present invention unless otherwise specified, but are merely described. It's just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.
[Exterior case 100]

  1 and 2 show the outer shape of a battery pack according to an embodiment of the present invention. In these drawings, FIG. 1 is a perspective view of the battery pack as viewed from obliquely above, and FIG. 2 is a perspective view of the battery pack as viewed from obliquely below. The battery pack shown in these figures has a plurality of batteries built in, and the exterior is covered with an outer case 100. The outer case 100 is molded of ABS resin or the like, divided into two or more members, and fixed by a connecting method such as screwing or fitting. The exterior case 100 can be designed in various shapes according to the use, purpose, and usage of the battery pack. An exterior case 100 shown in FIG. 1 is divided into an upper exterior case 101 and a lower exterior case 102. In addition, a handle 103 is integrally formed on the upper portion to facilitate carrying. Further, the lower outer case 102 shown in FIG. 1 is provided with a connecting rib 104 along the outer peripheral surface in order to connect the upper outer case 101. Similarly, connecting ribs 104 are also provided on the outer periphery of the upper outer case 101, and the upper outer case 101 and the lower outer case 102 are connected by connecting the connecting ribs to each other. Further, the outer case is fixed by screwing in this state.

A plurality of batteries are accommodated in the exterior case 100. The battery fixing method is shown in FIGS. In these drawings, FIG. 3 is a perspective view of the inner case incorporating the battery block assembly, FIG. 4 is a perspective view showing the battery block assembly 201 built in the inner case of FIG. 3, and FIG. 3 is an exploded perspective view of the inner case 3 as viewed from above, FIG. 6 is a perspective view of FIG. 5 as viewed from below, and FIG. 7 is a diagram in which the battery block assembly 201 is inserted into the upper inner case in FIG. The perspective view seen from the bottom which shows a state is shown, respectively. As shown in these drawings, each battery 210 constituting the battery block assembly 201 is cylindrical, and a battery block assembly 201 is formed by stacking a plurality of battery blocks 200 arranged in the same direction. The batteries 210 are stacked in a grid pattern, but may be arranged so that the batteries are offset up and down. If batteries are arranged in an offset shape, a large number of cylindrical batteries can be arranged side by side efficiently. In the example of FIGS. 5 to 7, a total of 16 battery block aggregates 201 are configured by stacking battery blocks 200 including eight batteries 210 in two stages. In this example, two batteries 210 are connected in parallel in the vertical direction, and eight sets are connected in series in the horizontal direction. However, the number, arrangement, and connection form of the batteries are not limited to this example.
[Battery 210]

The battery 210 constituting the battery block 200 is a rechargeable secondary battery. In the battery block assembly 201 of FIGS. 5 to 7, the battery 210 is a cylindrical battery. In this embodiment, a cylindrical lithium ion secondary battery is used as the battery 210. Lithium ion secondary batteries are suitable as secondary batteries for pack batteries in which a plurality of lithium ion secondary batteries are connected in parallel and connected in series. This is because a plurality of lithium ion secondary batteries can be connected in parallel to reduce the internal resistance and increase the output current. In addition, since the lithium ion secondary battery has a large charge capacity, a sufficient use time can be secured without causing a shortage of capacity even in applications that require a large current. However, the battery pack 210 of the present invention does not specify the battery 210 as a lithium ion secondary battery, and a secondary battery such as a nickel-hydrogen battery or a nickel-cadmium battery can be used as long as it is a cylindrical battery.
[Lead plate 240]

Further, a lead plate 240 is fixed to the end face of each battery 210. As shown in FIGS. 5 to 7, the lead plate 240 covers the end faces of the plurality of batteries 210 at a flat portion, and electrically connects the terminals of the batteries 210 to connect the batteries 210 in series and in parallel. The lead plate 240 is made of a material having good electrical and thermal conductivity, and a metal plate such as aluminum, copper, or silver can be suitably used. In the example of FIGS. 5 to 7, four lead plates 240 for connecting the terminals of a total of six batteries 210 in two rows and two columns are used.
[Lead protrusion 242]

  In addition, a lead protrusion 242 is formed on the lead plate 240. The lead protrusion 242 is a terminal for measuring the intermediate potential of the battery block assembly 201 and is integrally formed so as to protrude from the lead plate 240 in order to facilitate connection work with other lead terminals. Thus, the terminal is pulled out from each lead plate 240 in order to measure the terminal voltage of the battery 210. In particular, when using a lithium ion secondary battery, it is necessary to detect and monitor the battery voltage in order to protect the battery 210. Therefore, the voltage of each lead plate 240 can be detected by the lead protrusion 242 and the voltage of a predetermined battery set can be monitored. Moreover, the function of a heat sink can also be combined by forming a lead protrusion part large. 5 to 6, the lead plate 240 has a rectangular shape, partially covers the end faces of the four batteries arranged vertically and horizontally, and is partially buried between the battery located on the top surface and the valley of the battery. By arranging the lead plate 240 as described above, the height at which the lead plate 240 protrudes upward can be suppressed, thereby contributing to downsizing of the device.

  Thus, by taking out the potentials of all the lead plates 240 from one direction by the lead protrusions 242, it becomes possible to detect the intermediate potential of the battery block assemblies 201 stacked in a plurality of stages on the circuit board side. . The number of batteries, the number of stacked layers of one battery block, and the like can be set as appropriate. In this example, the battery block assembly 201 has only one lead plate, but a lead plate is provided for each battery block constituting the battery block assembly, and the lead protrusions are extended in one direction from the plurality of lead plates. It is also possible to take out the potentials of all the lead plates. In this case, the lead plates are insulated as necessary so that the lead plates do not conduct with each other. The intermediate potential of the battery block assembly can be taken out from one direction, and the circuit board is arranged on this surface, so that it is possible to omit the long wiring by the lead wire directly or through a short route through another lead plate. The board and the battery can be made conductive, and the wiring between the circuit board and the battery can be greatly simplified. In particular, by not using lead wires, it is possible to realize a highly safe battery pack with a simple configuration by omitting wiring man-hours and reducing the risk of short-circuit due to disconnection or crossing of lead wires.

  Furthermore, the battery block 200 arrange | positions the thermal element for detecting battery temperature as needed to contact the battery surface. The thermosensitive element is used to control the battery protection by detecting the temperature of the battery 210. An element such as a thermistor, a thermocouple, a PTC element, or a PTC thermistor (positor) can be used that changes its electrical characteristics depending on the temperature. . The thermal element is preferably arranged in the valley between the batteries located on the outer periphery of the battery block assembly. By connecting the thermosensitive element to the circuit board and monitoring the battery temperature to detect a temperature rise, the circuit board drives the charge / discharge circuit and the protection circuit to suppress or cut off the amount of current. To ensure the safety of the battery pack.

The battery block assembly 201 is preferably fixed by winding the periphery of the battery block assembly 201 with a fixing tape so that the side surface portion of the battery 210 is attached. Thereby, the battery 210 is securely fixed, and the situation where the cylindrical battery 210 is rotated by vibration or impact and peeled off from the joint surface with the lead plate 240 is avoided.
[Inner case 400]

The battery block assembly 201 configured as described above is inserted into the inner case 400 and fixed. The inner case 400 is divided into upper and lower parts, and includes a box-like lower inner case 402 having an opening and a lid-like upper inner case 401 that closes the opening. The assembled battery block assembly 201 is set in the upper inner case 401 as shown in FIG. 7, and the battery block assembly 201 is inserted into the lower inner case 402 as shown in FIG. The opening is closed with the upper inner case 401, and this portion is hermetically joined and fixed by thermal welding or adhesion such as ultrasonic welding. The inner case 400 is manufactured by molding an insulating material. The insulating material forming the inner case 400 is a plastic that can be ultrasonically welded, that is, a thermoplastic plastic. The inner case 400 is preferably a translucent member. As the light-transmitting member, a polycarbonate resin can be suitably used. The polycarbonate resin is excellent in heat resistance and is not dissolved in the electrolytic solution, and thus is suitable for protecting a lithium ion secondary battery. By using the translucent inner case, the internal state of the inner case can be visually recognized from the outside, so that it is easy to visually detect malfunctions and assembly problems of the battery, and the reliability of the battery can be improved. On the other hand, if the outer case 100 or the like into which the inner case is inserted is made of inexpensive ABS resin or the like, the manufacturing cost of the battery pack can be reduced.
[Upper inner case 401]

  As shown in FIG. 5, the upper inner case 401 has a lead slit 410 into which the lead protrusion 242 of the lead plate 240 is inserted. The lead protrusions 242 of the lead plate 240 are inserted into lead slits 410 formed in the upper inner case 401 when the battery block 200 is inserted into the inner case 400. As described above, the upper inner case 401 has a lead slit 410 that is large enough to allow the lead protrusion 242 to be inserted in a portion where the lead protrusion 242 is located. Positioned.

When the lead protrusion 242 is inserted into the lead slit 410, the lead protrusion 242 passes through the upper inner case 401 and protrudes outside the inner case 400. In this state, the lead protrusion 242 is wired with the circuit board 600.
[Substrate holder 610]

As shown in FIG. 5, the upper inner case 401 has a substrate holder 610 that holds the circuit substrate 600 on the upper surface. The substrate holder 610 includes substrate holder ribs 612 that hold the circuit substrate 600 so as to surround the periphery. The board holder rib 612 is formed in a size and shape that can accommodate the circuit board 600 therein. Further, by forming the upper surface of the upper inner case 401 to be larger than the board holder rib 612, a margin is formed around the board holder rib 612, and the side facing the lead protrusion 242, that is, the battery block assembly 201. The horizontal width direction is defined as a flange 820. The width of the upper inner case 401 is designed according to the lateral width of the battery block assembly 201 accommodated on the back side, and the width of the board holder rib 612 is designed according to the lateral width of the circuit board 600 accommodated therein. The In the example shown in FIG. 5, the width of the circuit board 600 is made narrower than the width of the battery block assembly 201 so that the circuit board 600 can be accommodated between the lead protrusions 242 protruding left and right. Thus, when the circuit board 600 is further miniaturized and can be made smaller than the lateral width of the battery block assembly 201, the present configuration can be suitably applied. In this example, the width of the battery block assembly 201 corresponds to the length of one battery, but when using a battery block assembly in which a plurality of batteries are connected in series, the width of the battery block assembly 201 Corresponds to the length of a plurality of batteries, and the circuit board to be used is designed corresponding to this length. In the example of FIG. 5, margins are provided not only in the horizontal width direction but also in the vertical direction of the battery block aggregate 201, but it is also possible to reduce or omit this portion.
[Lead slit 410]

The flange portion 820 is provided with a lead slit 410 into which the lead protrusion 242 that protrudes from the lead plate 240 of the battery block assembly 201 inserted on the back side is inserted. The lead slit 410 is formed to have a width and length into which the lead protrusion 242 can be inserted. By penetrating the lead slit 410 and projecting the lead protrusion 242 toward the substrate holder 610, the circuit board 600 and the battery lead plate 240 can be electrically connected. At the same time, by disposing the substrate holder 610 having the flange 820 between the circuit board 600 and the battery block assembly 201, it is possible to reliably insulate them.
[Connecting rib 412]

Further, a connecting rib 412 is provided around the lead slit 410. The connecting rib 412 surrounds the periphery of the lead slit 410 and is formed upright in a direction substantially parallel to the protruding direction of the lead protruding portion 242 as a guide for inserting a substrate lead portion 830 described later. As shown in FIG. 5, the connecting rib 412 is formed in the same plane as the side surface so as to extend from the side surface of the upper inner case 401. The connecting rib 412 can also be designed to be higher than the upper end of the lead protrusion 242 in a state where the lead protrusion 242 is inserted into the lead slit 410. This prevents the projecting lead projecting portion 242 from coming into contact with a conductive member such as metal and causing a short circuit. The height of the connecting rib 412 may not be uniform over the entire circumference, and only a part of the wall surfaces may be formed high. Further, sealing is performed by injecting a sealing material such as silicon resin into a region defined by the connecting rib 412 in a state where the lead protruding portion 242 and a substrate lead portion 830 described later are connected by the connecting rib 412. You can also. As a result, the lead plate 240 and the substrate lead portion 830 are fixed in a state of being securely electrically connected, and at the same time, waterproofing, insulation and heat dissipation are also achieved.
[Substrate lead portion 830]

  The lead protruding portion 242 inserted and protruded into the lead slit 410 and the circuit board 600 held by the substrate holder 610 are electrically connected by the substrate lead portion 830. As shown in FIG. 5, the substrate lead portion 830 includes a substrate lead mountain portion 831 that is bent into a mountain shape, and a horizontal portion that extends substantially parallel to the left and right. One horizontal portion is connected to the surface of the substrate, and the other horizontal portion is a substrate lead horizontal portion 832 connected to the lead protrusion 242. The substrate lead portion 830 is formed by bending a conductive metal plate or the like. The substrate lead chevron 831 is configured to have a size and shape that straddles the surface of the substrate holder rib 612. By forming U-shaped or U-shaped clinch, the board lead chevron 831 absorbs vibration and impact from the outside and can reduce the load on the lead by improving the reliability. To contribute. As shown in FIGS. 3 and 5, a step portion 613 is formed on the upper edge of the substrate holder rib 612 in which the substrate lead chevron 831 is disposed. The step portion 613 is a guide for guiding the substrate lead chevron portion 831 of the substrate lead portion 830. A recess is formed in a width that can hold the substrate lead portion 830, and the substrate lead chevron portion 831 is positioned and held therein. Prevent misalignment.

  An example of the connection state between the substrate lead portion 830 and the lead plate 240 is shown in FIGS. In these drawings, only the substrate lead portion 830 and the lead plate 240 are shown for explanation, and the substrate holder 610 and the flange portion 820 are both omitted. The example of FIG. 8 is the same substrate lead portion 830 as shown in FIGS. 5 and 6, and a rectangular substrate lead horizontal hole 834 for inserting the lead protrusion 242 into the substrate lead horizontal portion 832 is formed. Yes. The substrate lead horizontal hole 834 is designed in size and position so that the substrate lead horizontal hole 834 overlaps the lead slit in a state where the substrate lead portion 830 is positioned by the stepped portion 613. On the other hand, a U-shaped lead insertion portion 833 is further formed at the tip of the lead protrusion 242. In this example, the lead insertion portion 833 of the lead protrusion 242 is designed to be inserted into the lead slit in a state where the battery block assembly 201 is set in the upper inner case 401. When the lead insertion portion 833 is inserted into the lead slit, the lead protrusion 242 and the substrate lead portion 830 are electrically connected by protruding from the substrate lead horizontal hole 834 to the upper surface of the upper inner case 401. In order to ensure the connection in this state, soldering, welding, sealing with a sealing material, or the like can be performed.

In the example of FIG. 9, a substrate lead portion 830B used in a battery pack according to another embodiment of the present invention is illustrated. The substrate lead portion 830B is formed by bending a conductive wire such as a metal wire to form a substrate lead chevron portion 831B and a substrate lead horizontal portion 832B. Further, the lead projecting portion 242B of the lead plate 240B forms a lead groove portion 835 whose tip is recessed in a concave shape. With this configuration, when the lead protrusion 242B is inserted into the lead slit, the tip of the wire rod is inserted into and contacted with the lead groove 835, and the lead protrusion 242 and the board lead 830B are electrically connected. Also in this case, the connection can be reinforced by soldering or the like as described above.
[Circuit board 600]

  A circuit board 600 that mounts electronic components and the like, constitutes a battery charge control, a protection circuit, and the like, and constitutes an arithmetic circuit for the remaining capacity of the battery is held by a board holder 610. The substrate holder 610 has substrate holder ribs 612 upright so as to surround the circuit substrate 600. In general, the circuit board is thin with respect to the thickness and has a large area, so that the strength is weakened. The effect of being reinforced with is obtained.

The circuit board 600 is arranged in parallel on one surface of the battery block 200. The protection circuit mounted on the circuit board 600 is a circuit that detects battery overcharge or overdischarge to control current, a circuit that detects battery overcharge to cut off current, and the like. The protection circuit includes a voltage detection circuit (not shown) that detects the voltage of the battery in order to detect battery overcharge and overdischarge. The voltage detection circuit detects the voltage of the intermediate potential of the battery block assembly 201 via the lead plate 240, and detects overcharge or overdischarge of the battery from the detected voltage. Furthermore, although not shown, the circuit board is connected to an output terminal for charging / discharging. The battery pack is discharged in a state where the charging / discharging output terminal is connected to the electric device, and the battery is charged in a state where the charging / discharging output terminal is connected to the charger.
[Potting]

  The circuit board 600 wired in the board holder 610 can be waterproofed by resin potting or coating. By potting the circuit board 600, the circuit board 600 is waterproofed and insulated to avoid a short circuit. Resin such as urethane resin, silicon resin, and epoxy resin can be used as the potting material. Furthermore, the effect that heat dissipation is improved by potting is also obtained. Without any coating, it will be exposed to highly heat-insulating air, resulting in poor thermal conductivity, but the coating will dissipate heat from the contact area, improving heat dissipation and improving battery reliability. Is also improved. Further, as described above, a silicon-based resin is preferable as a potting material because it can improve heat dissipation.

The upper inner case 401 is integrally formed with a substrate holder rib 612 on the upper surface. However, the substrate holder may be formed as a separate member and connected to the upper inner case by means such as adhesion, welding, and screwing.
[Example without inner case]

  In addition, although the example which uses an inner case was demonstrated in said example, it is good also as a structure which stores a battery block directly in an exterior case, without using an inner case. 10 and 11 show a configuration in which a substrate holder 610B is connected to the upper surface of a battery block assembly 201 as a battery pack according to still another embodiment of the present invention. By storing the battery block aggregate 201 shown in these drawings in an outer case, a battery pack can be configured without using an inner case. A substrate holder 610B shown in FIG. 10 has a flange 820B formed on a side surface, and a lead slit 410B and the like are formed therein. Further, no margin corresponding to the flange is provided on the front and rear surfaces of the substrate holder 610B. Further, the connecting rib 412B is formed as a pair of side walls so as to guide the substrate lead portion 830 from both sides. The configuration of each part can be the same as described above, which makes it possible to configure a slimmer battery pack without using an inner case, and further simplify by reducing the number of parts, reducing the size and thickness and reducing the number of production steps Price can be achieved.

  The battery pack of the present invention can be suitably applied to battery packs such as bicycles, tools, automobiles, etc., in which a plurality of batteries are connected in parallel and these are connected in series to increase the output.

It is the perspective view which looked at the battery pack which concerns on one embodiment of this invention from diagonally upward. It is the perspective view which looked at the battery pack of FIG. 1 from diagonally downward. It is a perspective view which shows the inner case which incorporated the battery block aggregate | assembly. FIG. 4 is a perspective view showing a battery block assembly built in the inner case of FIG. 3. It is the perspective view which looked at the exploded view of the inner case of FIG. 3 from upper direction. It is the perspective view which looked at the exploded view of the inner case of FIG. 5 from the downward direction. It is the perspective view seen from the lower part which shows the state which inserted the battery block aggregate | assembly in the upper inner case in FIG. It is a perspective view which shows an example of the connection state of a board | substrate lead part and a lead board. It is a perspective view which shows the other example of the connection state of a board | substrate lead part and a lead board. It is a perspective view which shows the state which connected the board | substrate holder to the upper surface of a battery block aggregate | assembly as a battery pack which concerns on other embodiment of this invention. It is the perspective view which looked at the battery block aggregate | assembly which connected the board | substrate holder of FIG. 10 from the downward direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Outer case 101 ... Upper outer case 102 ... Lower outer case 103 ... Handle 104 ... Connecting rib 200 ... Battery block 201 ... Battery block assembly 210 ... Battery 240, 240B ... Lead board 242, 242B ... Lead protrusion part 400 ... Inner Case 401 ... Upper inner case 402 ... Lower inner case 410, 410B ... Lead slits 412, 412B ... Connection rib 600 ... Circuit board 610, 610B ... Substrate holder 612 ... Substrate holder rib 613 ... Stepped portion 820, 820B ... 鍔Portions 830, 830B ... substrate lead portions 831, 831B ... substrate lead chevron portions 832, 832B ... substrate lead horizontal portion 833 ... lead insertion portion 834 ... substrate lead horizontal hole 835 ... lead groove portion

Claims (7)

A plurality of batteries extending in the first direction are arranged close to each other in parallel with the first direction, and the end faces of the batteries are substantially flush with each other along the second direction perpendicular to the first direction. A battery block assembly arranged in a straight line and stacked in a third direction perpendicular to the first direction;
In order to connect a plurality of batteries included in the battery block assembly in parallel and in series in a predetermined pattern, they are joined to adjacent batteries at the end faces of the batteries to electrically connect them, and in a first direction and a first direction A lead plate for projecting a lead protrusion capable of detecting an intermediate voltage of the battery block assembly on a first surface of the battery block assembly parallel to the direction of 2;
A circuit board disposed substantially parallel to the first surface of the battery block assembly and electrically connected to the lead plate;
A board lead portion for electrically connecting the circuit board and the lead plate;
The battery pack further comprises a board holder for holding the circuit board facing the first surface from which the lead projecting portion of the battery block assembly is projected. battery. The battery pack according to claim 1,
The width of the circuit board in the first direction is shorter than the length in the first direction of the battery,
The substrate holder includes a substrate holder rib for holding the circuit board so as to surround the periphery of the circuit board, and a flange portion is protruded in a first direction from a side surface of the substrate holder rib;
The collar portion is extended along a second direction, and has a lead slit for inserting the lead protrusion,
The lead projecting portion inserted into the lead slit and the circuit board are electrically connected by the substrate lead portion,
The substrate lead portion has a substrate lead horizontal portion parallel to the first surface, and a substrate lead mountain portion straddling the substrate holder rib, and the substrate lead horizontal portion is inserted into the lead slit. The battery pack is characterized in that the lead projecting portion and the substrate lead portion are electrically connected by contacting the portion. A battery pack according to claim 2,
The board lead part is formed by bending a flat plate, and a board lead horizontal hole for inserting the lead projection part is formed in the board lead horizontal part, while a lead insertion part is provided at the tip of the lead projection part The battery pack is characterized in that the lead projecting portion and the substrate lead portion are electrically connected by inserting the lead insertion portion into the substrate lead horizontal hole. A battery pack according to claim 2,
The substrate lead portion has a shape in which a wire is bent, the lead protruding portion forms a lead groove portion at a tip, and the lead protrusion is formed by inserting the tip of the wire lead of the substrate lead portion into the lead groove portion. The battery pack is characterized in that the part and the board lead part are electrically connected. A battery pack according to claim 2,
The battery pack chevron is formed by forming a U-shaped clinch. A battery pack according to claim 2,
The battery pack according to claim 1, wherein the rib for the substrate holder is formed with a stepped portion for fitting the substrate lead chevron. The battery pack according to claim 1, further comprising:
An inner case for inserting the battery block assembly;
The inner case is divided into an upper inner case and a lower inner case,
The upper inner case is provided with the substrate holder on the upper surface, the lower inner case is formed in a box shape with one surface opened, and the battery block assembly connected to the substrate holder is inserted into the opening, A battery pack, wherein the opening is closed with the substrate holder.

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