JP2012212590A - Battery pack, and power-assisted bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack being resistant to vibrations and impacts and exhibiting stable characteristics.SOLUTION: The battery pack comprises a battery protector 400 having a first plate part 420 and a second plate part 440 integrally connected to both edges of the first plate part in the cross direction and extending in the direction approximately perpendicular to both surfaces of the first plate part. A plurality of battery protector blocks 450 including a flat battery mounted on the first plate part is integrated so that the surfaces of the flat batteries mounted to exceed the height of the second plate part face each other.

Description

  The present invention relates to a battery pack configured by connecting a plurality of secondary batteries, and an electric bicycle equipped with the battery pack.

Various types of secondary batteries are used as electric power sources for driving or auxiliary driving in electric bicycles.Lithium ion secondary batteries, in which charging and discharging are performed by moving lithium ions between the negative electrode and the positive electrode, Since it has battery characteristics of high energy density and high output, it is suitable as a battery for driving power supply.
As the lithium ion battery, a cylindrical battery obtained by winding a positive electrode and a negative electrode laminated via a separator, and a flat battery obtained by laminating a positive electrode and a negative electrode via a separator are known.
Among these, flat-shaped ones can easily increase the capacity per unit cell by increasing the area of the positive and negative electrodes or increasing the number of positive and negative electrodes to be stacked. It is suitable as a battery for power supplies.
A flat unit battery of a lithium ion battery can effectively utilize the high energy density of a lithium ion battery by covering a battery element with a film-shaped exterior material.
The film-clad battery is used for various applications. For example, Patent Document 1 (Japanese Patent Laid-Open No. 2007-257901) proposes a battery pack for an electric bicycle using a film-clad battery.

JP 2007-257901 A

There are two types of electric bicycles: one that reduces the burden on the driver when the bicycle is driven by the action of a motor that is installed, and one that allows the driver to run without having to step on the pedal. Since the mass of a motor, a driving device, and a battery for driving the motor is added to the electric bicycle, it is required to reduce the mass of these devices. A battery with a large capacity is required to use the action of the motor during long-distance or long-time movement.
Among various types of batteries, a lithium ion battery having a large mass energy density and large volume energy density is suitable for an electric bicycle. In particular, a film-clad battery packaged with a film-shaped packaging material has a feature that its energy efficiency is higher than a battery using a metal can as a packaging material.

Some electric bicycles have wheels mounted on a bearing attached to the vehicle body via a shock absorber, but the impact applied to the vehicle body is significantly different from that of an automobile. For this reason, the battery pack attached to the bicycle body has a large impact and vibration from the road surface.
On the other hand, since a film-clad battery excellent in energy density is covered with a thin film-shaped packaging material, countermeasures against impact and vibration are more important than a battery housed in a metal-made can.
In the battery pack of Patent Document 1, in order to dissipate the heat generated from the flat film-clad battery, a heat collecting member is provided in which an intermediate heat collecting plate is disposed with a space between the heat collecting plates at both ends. A work is required for inserting a flat battery having low rigidity into a space in which three sides between the heat collecting plates are opened without causing deformation or the like.

Further, if the interval is increased in order to facilitate the insertion of the flat battery, a gap is generated between the intermediate heat collecting plate, and the thermal contact between the unit cell and the heat collecting plate becomes insufficient. On the other hand, when the interval is small, it is difficult to work in a short time.
Further, in the battery pack of Patent Document 1, since the heat collecting member is open on three sides, it is insufficient for fixing the film-covered battery, vibration and shock.
The present invention relates to a battery pack using a film-clad battery, which can stably hold vibrations and shocks with respect to the film-clad battery, has good heat dissipation characteristics from the battery, and is an electric bicycle. It is intended to provide a battery pack provided with a battery protection member having a small influence on the mass increase.

The present invention solves the above-mentioned problem, and is integrally coupled to both the first plate-like portion and both end portions in the width direction of the first plate-like portion, and both sides of the first plate-like portion. A battery protection member having a second plate-like portion extending substantially perpendicularly to the first plate-like portion, and the first plate of the second plate-like portion on at least one surface of the first plate-like portion A battery protection member block on which a flat battery is placed beyond the height from the shape part, and a plurality of the battery protection member blocks are placed above the height of the second plate member. It is a battery pack in which the battery surfaces are integrated with each other facing each other.
In the present invention, the term “substantially vertical” includes a state in which vertical and a desired action and effect can be substantially obtained, and includes, for example, an angle of 80 ° to 100 °.
In the battery pack, the mounting surface of the flat battery is formed on both surfaces of the first plate-like portion.
In the battery pack, a flat battery is stacked on the first plate-like portion.
In the battery pack, a flat plate surface of the flat battery is placed on the first plate-like portion.
In the battery pack, the flat battery is a film-clad battery.
In the battery pack, a pull-out tab of the flat battery is taken out in a longitudinal direction of the first plate-like portion of the protection member.
In the battery pack, one adhesive surface of a double-sided adhesive tape is bonded to the flat battery, and the flat battery is bonded to the first plate-shaped portion or the adjacent flat battery surface.
An electric bicycle including the battery pack.

  The battery pack according to the present invention is a battery pack in which a lithium ion battery or the like excellent in energy efficiency that is packaged with a film-shaped packaging material is securely protected from impact or the like by a lightweight battery protection member. A battery pack having a capacity, and an electric bicycle equipped with the battery pack can be provided.

FIG. 1 is a diagram showing a unit battery 100 constituting a battery pack according to an embodiment of the present invention. FIG. 1A is a diagram illustrating a unit battery 100 that is sealed by forming heat-sealing portions on four sides. FIG. 1B is a diagram illustrating a unit battery 100 that is sealed by forming a heat-sealed portion on three sides. FIG. 2 is a diagram illustrating a state in which the connection tab 125 is joined to the positive electrode extraction tab 120 of the unit battery 100. FIG. 3 is a view showing a state in which holes are provided in the positive and negative lead tabs for series connection of the unit cells 100. FIG. 4 is a view for explaining a holder member 200 constituting the battery pack according to the embodiment of the present invention. FIG. 5 is a perspective view of a substrate 300 used for series connection of unit batteries 100 in the battery pack according to the embodiment of the present invention. FIG. 6 is a view for explaining a battery protection member 400 constituting the battery pack according to the embodiment of the present invention. FIG. 7 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 8 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 9 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 10 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 11 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 12 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 13 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 14 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 15 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 16 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 17 is a diagram for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention. FIG. 18 is a diagram illustrating a manufacturing process of the battery pack according to the embodiment of the present invention. FIG. 19 is a diagram for explaining a manufacturing process of the battery pack according to the embodiment of the present invention. FIG. 20 is a diagram illustrating a manufacturing process of the battery pack according to the embodiment of the present invention. FIG. 21 is a diagram illustrating a manufacturing process of the battery pack according to the embodiment of the present invention. FIG. 22 is a diagram for explaining a manufacturing process of the battery pack according to the embodiment of the present invention. FIG. 23 is a diagram illustrating a manufacturing process of the battery pack according to the embodiment of the present invention. FIG. 24 is a diagram illustrating a manufacturing process of the battery pack according to the embodiment of the present invention. FIG. 25 is a diagram for explaining a manufacturing process of the battery pack according to the embodiment of the present invention. FIG. 26 is a diagram illustrating an electric bicycle according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a unit battery 100 constituting a battery pack according to an embodiment of the present invention. As the unit battery 100, a lithium ion secondary battery that is charged and discharged by moving lithium ions between a negative electrode and a positive electrode is used.
The unit battery 100 of the present invention is also referred to as a flat battery because its shape is flat.
The unit battery main body 110 includes a laminated electrode body in which a plurality of sheet-like positive electrodes and a plurality of sheet-like negative electrodes are laminated via separators, and an electrolyte solution (both not shown) having a rectangular film shape in plan view It has a structure housed in the material. A positive electrode extraction tab 120 and a negative electrode extraction tab 130 are extracted from the upper end portion 111 of the unit battery main body 110.

The positive electrode extraction tab 120 and the negative electrode extraction tab 130 are both planar, and are connected to the sheet-shaped positive electrode and the sheet-shaped negative electrode directly or via a lead body in the film-shaped packaging material, respectively. As the film-shaped packaging material, a film-shaped packaging material having a heat-sealing resin layer on the inner surface of the battery and laminated on a metal foil such as an aluminum foil having a protective film laminated on the outer surface of the battery is used.
Specifically, a member having strength and heat resistance such as nylon and polyethylene terephthalate is provided on the surface located on the outer surface side of the aluminum foil, and heat fusion property such as polypropylene and polyethylene is good on the inner surface side. Those obtained by laminating materials can be used.

A battery element in which a positive electrode and a negative electrode are laminated via a separator by a film-shaped packaging material, and the periphery of the film-shaped packaging material in a state in which the electrolytic solution is accommodated therein, that is, an upper end portion 111, a lower end portion 112, and two side edges The inside of the portion 113 is hermetically sealed by heat sealing.
In the unit battery 100 as described above, the material of the positive electrode extraction tab 120 is typically aluminum or an aluminum alloy, and the material of the negative electrode extraction tab 130 is nickel, nickel-plated copper, or nickel-copper clad. It is used for. In the present embodiment, a positive electrode extraction tab 120 made of aluminum and a negative electrode extraction tab 130 made of nickel are used.
In the above description, as shown in FIG. 1A, the film-shaped exterior material has been described in which the upper end portion 111, the lower end portion 112, and the two side end portions 113 of the battery element are thermally fused.
Further, as shown in FIG. 1B, the battery element is covered with one film-like exterior material, and the upper end portion 111 for taking out the pull-out tab portion of the battery element and only the side end portions 113 on both sides are heat-melted on three sides. It may be sealed by wearing. In this case, any of the end portions may be a folded portion of the film-shaped exterior material, but the lower end portion 112 is preferably a folded portion of the film-shaped exterior material.

In configuring the battery pack according to the present invention, the positive pull-out tab of the unit battery 100 and the negative pull-out tab of the unit battery 100 adjacent to the unit battery 100 are mechanically tightened with a bolt and nut. Secure with and make electrical connection. Here, in the configuration in which the aluminum positive electrode extraction tab 120 and the nickel negative electrode extraction tab of the unit battery 100 are mechanically fixed, the conductivity after a predetermined period of time is deteriorated due to a potential difference problem. there is a possibility. Therefore, in the battery pack according to the present invention, the nickel members are located at the location where the positive electrode extraction tab of the unit cell 100 and the negative electrode extraction tab adjacent to the unit cell 100 are mechanically fixed. The drawer tabs were connected so as to contact each other.
A configuration for this will be described. As shown in FIG. 1, in configuring the battery pack, the aluminum positive electrode extraction tab 120 in the unit battery 100 has a length a from the upper end portion 111, and the nickel negative electrode extraction tab 130 has a length from the upper end portion 111. B (b> a). Next, a nickel tab member 125 is joined and spliced to the aluminum positive electrode lead tab 120 having a length a by ultrasonic welding so that the length from the upper end 111 is b (see FIG. (See FIGS. 2 and 3). In order to connect the unit cells 100 in series, a hole 127 is provided in the tab member 125 as a positive polarity extraction tab, and a hole 137 is provided in the negative electrode extraction tab 130. Hereinafter, the entire extraction tab formed by bonding the tab member 125 may be referred to as the positive electrode extraction tab 120.
As will be described later, in the battery pack according to the present invention, when electrically connecting a plurality of unit batteries 100, the nickel members (tab member 125, negative electrode extraction tab 130) are in contact with each other and have different polarities. Since the drawer tabs are connected to each other, the electrical connection portions of adjacent unit cells are electrically connected by the same kind of metal material, there is no problem of potential difference, and almost no deterioration in conductivity due to the passage of time occurs. .

Next, in the battery pack according to the embodiment of the present invention, the holder member 200 used for electrically connecting the positive drawer tabs and the negative drawer tabs of the plurality of unit batteries 100 will be described. 4A and 4B are diagrams for explaining the holder member 200. FIG. 4A is a view of the holder member 200 seen from the first main surface side, and FIG. 4B is a holder view from the second main surface side. It is the figure which looked at the member 200,
FIG. 4C is a view showing a cross section taken along line XX ′ of FIG. 4A, and FIG. 4D is a view of the holder member 200 as viewed from the side.
The holder member 200 is a member made of a synthetic resin such as an ABS resin in which a first surface 210 and a second surface 250 having a front and back relationship with the first surface 210 are formed. In the first row 211 of the first surface 210 of the holder member 200, as shown in FIG. 4 (A), a pull-out tab insertion hole 215 is formed side by side from the top to the bottom. Similarly, on the second row 212 side of the first surface 210, drawer tab insertion holes 215 are formed side by side from the top to the bottom. When the unit battery 100 is attached to the holder member 200, the pull-out tab insertion hole 215 provided on the first surface 210 side is used. The extraction tab insertion hole 215 is a hole that penetrates from the first surface 210 side to the second surface 250 side, and is a hole through which the extraction tab of the unit battery 100 can be inserted.

As shown in FIG. 4A, on the upper side and the lower side of the first row 211 and the second row 212, pull-out tab guide ribs 203 are provided. Further, the pull-out tab guide portion 213 is sandwiched between the pull-out tab guide ribs 203 on the first row 211 side, and the lead-out tab guide portion 213 is sandwiched between the pull-out tab guide ribs 203 on the second row 212 side. A recess 214 is provided.
On the first row 211 side, the pull-out tabs of the unit cells 100 on the end side among the plurality of unit cells 100 connected in series are arranged from the first surface 210 side based on the restriction by the pull-out tab guide ribs 203. The two sides 250 are guided so as to pass through the drawing tab drawing portion 213.
On the second row 212 side, the drawer tabs of the unit cells 100 on the end side among the plurality of unit cells 100 connected in series are arranged on the first surface 210 side based on the regulation by the drawer tab guide ribs 203. From the first side to the second surface 250 side, it is guided so as to pass through the drawing tab drawing recess 214.

  Of the plurality of unit batteries 100 connected in series, the drawer tab of the unit battery 100 that is not on the end side is attached to the holder member 200 so as to be inserted into the drawer tab insertion hole 215. On the top and bottom (as viewed in FIG. 4A) of the drawer tab insertion hole 215, a drawer tab guide protrusion 220 is provided so as to sandwich the drawer tab insertion hole 215 from above and below. The pull-out tab guide protrusion 220 is roughly constituted by a top portion 221 and two tapered side surfaces 222 connected to the top portion 221, and when the pull-out tab of the unit battery 100 is to be inserted into the pull-out tab insertion hole 215, The space between the two tapered side surfaces 222 is gradually narrowed, and attachment of the unit battery 100 to the holder member 200 is facilitated. For this reason, the work efficiency at the time of connecting the some unit battery 100 in series improves, and it can improve productivity.

The substrate 300 is attached to the second surface 250 of the holder member 200. On this board | substrate 300, the drawer tabs of the adjacent unit battery 100 are folded up, connected, and conduction | electrical_connection is achieved. When connecting the pull-out tabs of the adjacent unit cells 100 to each other, it is due to mechanical fixation by bolts and nuts. For this purpose, the nut accommodating portion 255 for accommodating the nut 256 is the first row on the second surface 250 side. Six are provided on the 211 side and five are provided on the second row 212 side. Further, on the second surface 250 side, there is a partition piece 260 for ensuring insulation between the drawer tab connecting portions of the unit battery 100 formed on the substrate 300 or between the drawer tab connecting portion and the drawer tab. Three locations are provided on the first row 211 side, and two locations are provided on the second row 212 side.
The alignment protrusions 263 are protrusions that are used for alignment when the substrate 300 is attached to the holder member 200, and are arranged one on each of the first row 211 side and the second row 212 side. In addition, the screw holes 270 used for fixing the substrate 300 and the holder member 200 after the substrate 300 is attached to the holder member 200 by using the alignment projection 263 described above are provided on the first row 211 side. And one on each of the second row 212 side.

Next, in the battery pack according to the embodiment of the present invention, the configuration of the substrate 300 on which the connecting portions of the drawer tabs of the plurality of unit batteries 100 are formed will be described.
FIG. 5 is a perspective view of a substrate 300 used in series connection of unit cells 100 in the battery pack according to the embodiment of the present invention.
The substrate 300 mainly composed of glass epoxy or the like is used by being attached to the second surface 250 side of the holder member 200, and the outer peripheral shape of the substrate 300 is the second surface 250 of the holder member 200. The outer peripheral shape substantially coincides with the outer peripheral shape. At two positions on the outer periphery of the substrate 300, a drawing tab drawing notch 314 is formed so as to correspond to the drawing tab drawing recess 214 of the holder member 200.
The substrate 300 is provided with a pull-out tab pull-out hole 315 so as to correspond to the pull-out tab insertion hole 215 of the holder member 200. In addition, the substrate 300 is provided with partition piece extraction holes 317 so as to correspond to the partition pieces 260 of the holder member 200. The substrate 300 is provided with a pull-out tab / partition piece pull-out hole 316 corresponding to both the pull-out tab insertion hole 215 and the partition piece 260 of the holder member 200. Each of these holes is a hole penetrating from one main surface of the substrate 300 to the other main surface, and is configured such that the drawer tab of the unit battery 100, the partition piece 260, and the like can be inserted.
A thin film electrode part 320a, a thin film electrode part 320b, and a thin film electrode part 320c are provided at locations where the extraction tab of the unit battery 100 is fixed to the substrate 300 with bolts and nuts.

The thin film electrode portion 320 a is electrically connected to the metal positive electrode terminal washer 321 fixed on the substrate 300, and the thin film electrode portion 320 c is used for the metal negative electrode terminal fixed on the substrate 300. Conduction with the electrode washer 322 is achieved. Since the electrode at the end of the unit battery 100 connected in series is connected to the electrode washer 321 for positive terminal and the electrode washer 322 for negative terminal, the electrode washer 321 for positive terminal and the electrode washer 322 for negative terminal are connected. Is used as a terminal for charging and discharging power as a battery pack.
Further, the thin film electrode part 320 b is electrically connected to a terminal part (not shown) of the connector 340, and the potential for monitoring each unit battery 100 can be measured via the connector 340. . The connector 340 can also be configured such that a signal from a temperature measurement sensor (not shown) that measures the temperature of the unit battery 100 can be taken out.

Further, each of the thin film electrode part 320a, the thin film electrode part 320b, and the thin film electrode part 320c is provided with a pull-out tab connection screw hole 325 through which a pull-out tab connection bolt 257 used for fixing the pull-out tab of the unit battery 100 is inserted. It has been. In the thin film electrode part 320a and the thin film electrode part 320c, one drawer tab of the unit battery 100 at the end of the unit batteries 100 connected in series is fixed. On the other hand, two thin film electrode portions 320b are fixed so that the pull-out tabs of adjacent unit cells 100 are folded.
Two alignment holes 328 corresponding to the alignment protrusions 263 provided on the second surface 250 side of the holder member 200 are formed in the substrate 300, and the two alignment protrusions 263 are By passing through the alignment hole 328, it is possible to easily align the holder member 200 and the substrate 300, which contributes to an improvement in productivity. The substrate fixing screw hole 329 formed in the substrate 300 is a hole through which the substrate fixing screw 271 used for fixing the holder member 200 and the substrate 300 is inserted.

Next, in the battery pack according to the embodiment of the present invention, when a plurality of unit batteries 100 are connected in series to form a battery connection structure 500, a battery protection member 400 for protecting this will be described.
FIG. 6 is a view for explaining a battery protection member 400 constituting the battery pack according to the embodiment of the present invention. FIG. 6A is a first plate-like portion 410 to which the main surface of the unit battery 100 is attached. 6B is a view of the battery protection member 400 as viewed from the upper side of FIG. 6A.
The battery protection member 400 is used so as to be inserted between the unit batteries 100 placed when the unit battery 100 is placed. When the unit battery 100 is placed, the battery protection member 400 is placed. The unit batteries 100 are used as inserted.
The battery protection member 400 can be formed of a synthetic resin such as an ABS resin, a polyethylene terephthalate resin, or a polycarbonate resin. By using such a material, the battery protection member 400 can be realized in a lightweight and inexpensive manner.
The battery protection member 400 can also be formed of a metal member or a synthetic resin member in which good heat conductive material particles are dispersed. By using such a material, the battery protection member 400 can be realized with good thermal conductivity and light weight.
Specifically, the metal member is any one selected from aluminum, an aluminum alloy, and copper, and the good heat conductive material particles are any one of aluminum nitride, silicon nitride, and alumina.
Examples of the synthetic resin material include an ABS resin, a polyethylene terephthalate resin, and a polycarbonate resin, and materials in which good heat conductive material particles are dispersed can be cited.
Of these, aluminum and aluminum alloys are preferable.
In the case of aluminum, aluminum alloy or the like, it is preferable to treat the surface with anodized to form an insulating layer or to form an insulating film. Thereby, even if a voltage application part contacts a protection member, generation | occurrence | production of a problem can be prevented.
The first plate-like portion 410 of the battery protection member 400 is a member that is sandwiched between the unit battery 100 and the unit battery 100 connected in series therewith. On the other hand, the second plate-shaped portion 440 is provided so as to extend from both ends of the first plate-shaped portion 410 in a direction perpendicular to the first plate-shaped portion 410. Therefore, as shown in FIG. 6B, the battery protection member 400 is a member having an H-shaped cross section.

Next, a procedure for manufacturing the battery connection structure 500 formed by connecting the unit batteries 100 from the above members will be described with reference to FIGS. 7 to 17 are views for explaining a manufacturing process of the battery connection structure 500 constituting the battery pack according to the embodiment of the present invention.
First, in the process shown in FIG. 7, the nuts 256 are attached to all the nut accommodating portions 255 provided on the second surface 250 of the holder member 200. The inner circumference of the nut accommodating portion 255 is set to such a size that the nut 256 cannot be easily removed when the nut 256 is fitted into the nut accommodating portion 255.
In the subsequent process shown in FIG. 8, the alignment projection 263 of the holder member 200 is inserted into the alignment hole 328 of the substrate 300, thereby aligning the holder member 200 and the substrate 300. Subsequently, the two board fixing screws 271 are inserted into the board fixing screw holes 329 and screwed into the screw holes 270, so that the holder member 200 and the board 300 are fixed. Note that various types of screws can be used as the board fixing screw holes 329. However, the use of tapping screws improves the working efficiency during manufacturing.

  In the next step shown in FIG. 9, the unit cell 100 is arranged on the first surface 210 of the holder member 200, the negative electrode extraction tab 130 of the unit cell 100 is used, and the thin film electrode of the substrate 300 using the extraction tab drawing recess 214. It bends so that it may contact the part 320b. Further, the positive electrode pull-out tab 120 of the unit cell 100 is bent using the pull-out tab lead-out portion 213 so as to contact the thin film electrode portion 320a of the substrate 300, and the pull-out tab connection bolt 257 is inserted into the hole of the positive electrode pull-out tab 120. 127. The extraction tab connection screw hole 325 is inserted, and the extraction tab connection bolt 257 and the nut 256 accommodated in the nut accommodation portion 255 are screwed together. Thereby, the attachment of the first unit battery 100 is completed.

  The next step shown in FIG. 10 is an operation on the first surface 210 side of the holder member 200. In this step, two double-sided adhesive tapes 460 are attached to the upper main surface of the unit battery 100 as shown in the drawing. The double-sided adhesive tape 460 is used for fixing between the unit battery 100 that is first attached to the holder member 200 and the unit battery 100 that is secondly attached to the holder member 200. The double-sided adhesive tape 460 is provided on the main surface of the unit battery 100 as shown in the figure because a spacer described later is arranged between the two double-sided adhesive tapes 460 to increase productivity. is there.

  In the subsequent process shown in FIG. 11, after a spacer (not shown) having a thickness equal to or larger than the thickness of the double-sided adhesive tape 460 is disposed on the unit battery 100 attached first, the spacer is further disposed on the spacer. The two drawer tabs of the second unit battery 100 are inserted into the drawer tab insertion hole 215 so as to slide. As described above, the pull-out tab guide protrusions 220 are arranged above and below the two pull-out tab insertion holes 215. Furthermore, since the pull-out tab guide protrusions 220 are provided with tapered side surfaces 222, The space between the pull-out tab guide protrusions 220 is gradually narrowed. Thereby, the drawer tab of the unit cell can be easily guided to the drawer tab insertion hole 215 of the holder member 200.

Here, the positive electrode extraction tab 120 of the unit battery 100 that is first attached to the holder member 200 is arranged on the first row 211 side, and the negative electrode extraction tab 130 is arranged on the second row 212 side. The positive electrode extraction tab 120 of the unit battery 100 that is secondly attached to the holder member 200 is arranged on the second row 212 side, and the negative electrode extraction tab 130 is arranged on the first row 211 side. Hereinafter, when the unit cells 100 are sequentially placed or stacked, the positive electrode extraction tabs 120 of the unit cells 100 that are oddly attached are arranged on the first row 211 side, and the negative electrode extraction tabs 130 are arranged on the second row 212 side. The positive electrode extraction tabs 120 of the unit cells 100 arranged evenly are arranged on the second row 212 side, and the negative electrode extraction tabs 130 are arranged on the first row 211 side. As described above, since the orientation of the pull-out tabs of the adjacent unit cells 100 is different in the placement or stacking direction, it is not necessary to make a diagonal connection in the placement or stacking direction on the substrate 300 side.
After confirming that the upper end portion 111 of the second unit battery 100 has been pushed in until it abuts against the first surface 210 of the holder member 200, the operation proceeds to the next operation on the substrate 300 side.

In the subsequent step shown in FIG. 12, the positive electrode pull-out tab 120 of the unit battery 100 attached second is bent downward in the figure and overlapped with the negative electrode 130 of the unit battery 100 attached first. After this, the drawing tab connection bolt 257 is inserted into the hole / drawing tab connection screw hole 325 of each drawing tab, and the drawing tab connection bolt 257 and the nut 256 are screwed together to form the thin film electrode portion 320b. A connection portion between the negative electrode extraction tab 130 of the unit battery 100 attached first and the positive electrode extraction tab 120 of the unit battery 100 attached second is formed, and the electrical connection is completed.
On the other hand, the negative electrode extraction tab 130 of the unit battery 100 attached second is bent upward in the drawing to prepare for connection with the positive electrode extraction tab 120 of the unit battery 100 attached third.

  In the next step shown in FIG. 13, the battery protection member 400 is attached using a spacer in the same manner as when the second unit battery 100 is attached. The upper surface of the second unit battery 100 and the lower surface of the battery protection member 400 are attached by two double-sided adhesive tapes 460. Further, as shown in the drawing, two double-sided adhesive tapes 460 are attached to the upper surface of the battery protection member 400. The double-sided adhesive tape 460 secures the battery protection member 400 and the unit battery 100 that is thirdly attached to the holder member 200.

  FIG. 14 shows a state in which the third unit battery 100 to the eighth unit battery 100 are sequentially attached to the holder member 200 and the substrate 300 by the same method as described above. On the substrate 300 side, each time the unit batteries 100 are attached one by one, the drawer tab is folded, and the drawer tab connection bolts 257 are used to connect the drawer tabs of the adjacent unit cells 100 to make electrical connection. Is going.

The process shown in FIG. 15 shows a state where the battery protection member 400 is further attached after the eighth unit battery 100 is attached. Thus, in the battery connection structure 500 according to the present embodiment, the two battery protection members 400 are arranged, and the two battery protection member blocks 450 protected by the battery protection members are formed, and each unit is formed. The battery 100 is protected from external impacts.
The unit battery 100 is placed beyond the upper end portion in the height direction of the second plate-like portion 440 from the first plate-like portion 420. As described above, by placing the unit battery beyond the upper end portion of the second plate-shaped portion 440, heat dissipation from the periphery of the unit battery can be improved.
The battery placed beyond the upper end of the second plate-like part can be placed on either the upper part or the lower part of the figure, or the battery protection member 400 of both.

FIG. 16 shows a state in which the ninth unit battery 100 and the tenth unit battery 100 are further attached to the holder member 200 and the substrate 300 on the first plate-like portion 420 of the battery protection member 400. ing.
The negative electrode extraction tab 130 of the tenth unit cell 100 is fixed to the substrate 300 thin film electrode portion (not shown) using the extraction tab drawing portion 213. Accordingly, the drawer tabs of the first to tenth unit cells 100 are connected on the substrate 300, and the series connection of the ten unit cells 100 is completed, so that the two battery protection member blocks 450 are connected. The provided battery connection structure 500 is completed.

  In the battery pack of the present invention, the vertical projection surface of the outer edge 112A of the lower end portion 112 of the unit battery 100 onto the first plate-like portion 410 is located on the inner side of the first plate-like portion outer edge 480. Therefore, even when a large impact is applied to the battery pack, it is possible to prevent the unit battery 100 from being directly impacted by the outer edge 480 of the first plate-like portion of the battery pack. Can be protected.

Further, in the battery connection structure 500 shown in this figure, the unit battery 100 extends beyond the upper end portion in the height direction from the surface of the first plate portion 420 of the second plate portion 440 on the side surface of the battery protection member. The side surfaces of some of the unit cells are not covered by the second plate-shaped portion 400.
Therefore, ambient air flows from between the second plate-like parts 440 of the upper and lower battery protection members 400 to the placed unit battery 100, and the heat dissipation characteristics of the unit battery 100 are improved.

17 is a view of the battery connection structure shown in FIG. 16 as viewed from the substrate side.
Two battery protection member blocks 450 are provided, and charging / discharging of ten unit batteries 100 connected in series uses a positive terminal electrode washer 321 and a negative terminal electrode washer 322 attached to the substrate 300. Done. A terminal member 331 is attached to the electrode washer 321 for positive terminal, and a terminal member 332 is attached to the electrode washer 322 for negative electrode terminal.

As described above, according to the battery pack of the present invention, the work of inserting the positive and negative pull-out tabs of the plurality of unit batteries 100 into the pull-out tab insertion holes 215 of the holder member 200 is performed. In addition, since the pull-out tabs having different polarities of the plurality of unit batteries 100 are connected to each other on the substrate 300, the work efficiency in manufacturing the battery bag is high, and the productivity is improved.
Further, since the pull-out tabs of the plurality of unit cells 100 having different polarities are connected to each other on the substrate 300 by the pull-out tab connection bolts 257 and the nuts 256, the plurality of unit cells 100 can be easily electrically connected. This increases the work efficiency in manufacturing the battery pack and improves the productivity.

Next, a process of forming a battery pack according to the present invention using the battery connection structure 500 configured as described above will be described with reference to FIGS.
In the process illustrated in FIG. 18, the discharge terminal mounting recess 611 and the charge terminal mounting recess 612 provided in the first case body 600 are used for the first case body 600 for housing the battery connection structure 500. Then, the discharge terminal 613 and the charge terminal 614 are screwed.
In the process shown in FIG. 19, the first buffer member 621 is attached to the second housing portion 602 of the first case body 600, and the second buffer member 622 is attached to the circuit housing portion 603 with an adhesive or the like.
In the process illustrated in FIG. 20, the third buffer member 663 is attached to the second housing portion 662 of the second case body 660 with an adhesive or the like.

The process shown in FIG.21 and FIG.22 performs the process of attaching a shock absorbing material with respect to the battery connection structure 500. FIG. In the battery pack according to the present invention, the first battery connection structure 500 and the second battery connection structure 500 are configured to be accommodated in the battery pack.
In the process of FIG. 21, a thick fourth buffer member 504 is attached to the unit battery 100 at the end with respect to the first battery connection structure 500, and the second plate-like parts of all battery protection members. In addition, a fifth buffer member 505 thinner than the fourth buffer member 504 is attached. An adhesive or the like is used when attaching the fourth buffer member 504 and the fifth buffer member 505 to each part.
On the other hand, in the step of FIG. 22, the fourth buffer member 504 is attached to the unit battery 100 at the end with respect to the second battery connection structure 500, and the second plate-like portion of the battery protection member on one side. Only the 5th buffer member 505 is attached. As before, an adhesive or the like is used when attaching the fourth buffer member 504 and the fifth buffer member 505 to each part.

23, the discharge terminal 613 and the charge terminal 614 are connected to the protection circuit board 700, and the protection circuit board 700 is screwed to the circuit housing portion 603 of the first case body 600.
In the process shown in FIG. 24, the first and second battery connection structures 500 and the protection circuit board 700 are connected, and the first and second battery connection structures are connected to the first housing portion 601 of the first case body 600. The second battery connection structure 500 is housed in the body 500 and the second housing portion 602, respectively.
In the step shown in FIG. 25, the first case body 600 and the second case body 660 are screwed together to complete the battery pack according to the present invention.
FIG. 26 is a diagram illustrating an electric bicycle equipped with the battery pack of the present invention.
The electric bicycle 1 is equipped with a battery pack 4 of the present invention on a frame 2, and supplies electric power to a drive mechanism 3 of the electric bicycle.
The battery pack 4 of the present invention is directly attached to the frame 2 that receives vibration and shock from the road surface. However, since the battery pack 4 has measures against vibration and shock, stable operation is realized. it can.

  The battery pack of the present invention is not only provided with measures against vibration and shock, but also has a large battery capacity, and can be stably operated over a long period of time when mounted on an electric bicycle.

DESCRIPTION OF SYMBOLS 1 ... Electric bicycle, 2 ... Frame, 3 ... Drive mechanism, 4 ... Battery pack, 100 ... Unit battery, 110 ... Unit battery main body part, 111 ... Upper end part 112 ... lower end, 112A ... lower edge outer edge, 120 ... positive electrode extraction tab, 125 ... connection tab, 127 ... hole, 130 ... negative electrode extraction tab, 137 ... hole, 200 ... Holder member, 203 ... Drawer tab guide rib, 210 ... First surface, 211 ... First row, 212 ... Second row, 213 ... Drawout tab routing portion, 214 ... drawing tab drawing recess, 215 ... drawing tab insertion hole, 220 ... drawing tab guide protrusion, 221 ... top, 222 ... taper side, 250 ... second surface, 255... Nut housing portion, 256... Nut, 257. 260, partition piece, 263, positioning projection, 270, screw hole, 271, substrate fixing screw, 300, substrate, 314, drawer tab drawing notch 315: Extraction tab extraction hole, 316 ... Extraction tab / partition piece extraction hole, 317 ... Partition piece extraction hole, 320a, 320b, 320c ... Thin film electrode part, 321 ... For positive electrode terminal Electrode washer, 322 ... Electrode washer for negative electrode terminal, 325 ... Extraction tab connection screw hole, 328 ... Alignment hole, 329 ... Substrate fixing screw hole, 331, 332 ... Terminal member, 340 ... Connector, 400 ... Battery protection member, 410 ... First plate-like part, 420 ... Notch, 421 ... First notch, 422 ... Second notch, 423 ... Third notch, 440 ... Second plate-like part 450 ... Battery protection member block, 460 ... Double-sided adhesive tape, 480 ... Outer edge of first plate-like part, 500 ... Battery connection structure, 504 ... Fourth buffer member (thickness) 505 ... 5th buffer member (thin), 600 ... first case body, 601 ... first housing portion, 602 ... second housing portion, 603 ... circuit housing portion, 611 .. discharge terminal mounting recess, 612... Charging terminal mounting recess, 613... Discharge terminal, 614... Charging terminal, 621... First buffer member, 622. ..Second case body, 661... First housing portion, 662... Second housing portion, 663... Third buffer member, 673.

Claims (9)

A first plate-like portion;
A battery protection member having a second plate-like portion integrally coupled to both end portions in the width direction of the first plate-like portion and extending in a substantially vertical direction with respect to both surfaces of the first plate-like portion;
A battery protection member block in which a flat battery is placed on at least one surface of the first plate-like portion so as to exceed the height of the second plate-like portion from the first plate-like portion is provided. ,
A battery pack, wherein a plurality of the battery protection member blocks are integrated so that flat battery surfaces placed beyond the height of the second plate-like member face each other.   2. The battery pack according to claim 1, wherein mounting surfaces of the flat batteries are formed on both surfaces of the first plate-like portion.   The battery pack according to claim 1, wherein a flat battery is stacked on the first plate-like portion.   4. The battery pack according to claim 1, wherein a flat plate surface of the flat battery is placed on the first plate-like portion. 5.   The battery pack according to any one of claims 1 to 4, wherein the flat battery is a film-clad battery.   The battery pack according to any one of claims 1 to 5, wherein a pull-out tab of the flat battery is taken out in a longitudinal direction of the first plate-like portion of the protection member.   7. One of the adhesive surfaces of a double-sided adhesive tape is adhered to the flat battery, and the flat battery is adhered to the first plate-shaped portion or the adjacent flat battery surface. The battery pack described.   An electric bicycle comprising the battery pack according to any one of claims 1 to 7. A first plate-like portion;
A battery protection member having a second plate-like portion integrally coupled to both end portions in the width direction of the first plate-like portion and extending in a substantially vertical direction with respect to both surfaces of the first plate-like portion;
A battery protection member block in which a flat battery is placed on the first plate-like portion;
A battery connection structure in which a plurality of the battery protection member blocks are integrated with the flat battery surfaces facing each other,
The battery pack according to claim 1, wherein a total height of the flat battery integrated in a facing manner is greater than twice a height of the second plate-like portion from the first plate-like portion.

Images