JP2003242950A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack capable of safely and effectively performing connection/assembly operation. <P>SOLUTION: Plates 3 made of insulation resin are arranged at the upper and lower sides of a battery pack 1. Perimeter of the plates 3 and shorter than that of the battery pack 3. Three pieces of cross-shaped bus bars and a T-shaped bus bar are buried in the plate 3, and a plate opening part 15 is formed to the part where a unit cell 2 and the bus bar are welded. In order to detect the voltage of respective unit cells 2, openings are formed at four places of the upper and lower plates 3. A voltage detection wire 13 is adhered and fixed to a concavity formed to the plates, and soldered to the central part of respective bus bars. Respective unit cells 2 are arranged on the basis of a positioning protrusion 16, and respective terminals of the unit cells are spot- welded to the bus bars. A heat-shrinkable tube is not damaged by the edges when covering the battery pack, and the connection is made easy by the spot- welding. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack, and more particularly to a battery pack in which a plurality of columnar cells are mechanically and electrically connected to each other and plates made of an electrically insulating resin are arranged above and below each other and having polarities.

[0002]

2. Description of the Related Art Conventionally, in an assembled battery in which a plurality of cells are combined, the cells are connected in series and / or in parallel within the assembled battery. For example, in an assembled battery in which three columnar cells are adjacent to each other and are arranged side by side upside down, the terminals of the cells are connected in series by a plate-shaped metal connecting bus bar, and external output is provided at both ends of the assembled battery. Terminals are connected, and the entire battery pack is held by an outer case made of electrically insulating resin, or covered with a heat shrinkable shrink tube or the like to ensure electrical insulation.

When the entire battery pack is covered with a heat shrink shrink tube, the tube is more likely to be broken during heat shrinkage than the sharp edges and protrusions protruding from the battery pack before covering, simply by covering with the heat shrink shrink tube. The edges were hidden with electrically insulating paper.

[0004]

However, when a lithium battery, which is a high-performance secondary battery, is used as a single battery, if the above-mentioned electric insulating paper is simply placed on the assembled battery, each lithium battery will be Since it is necessary to measure all the voltages for charge / discharge control, the wiring work becomes complicated, and the work is dangerous and inefficient when all bus bars connecting the unit cells are completely exposed. There is a point.

In view of the above-mentioned problems, it is an object of the present invention to provide an assembled battery which enables safe and efficient connection / assembly work.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a plurality of columnar cells are mechanically and electrically connected to each other and plates made of an electrically insulating resin are arranged above and below having a polarity. In the assembled battery, the plate is smaller than the outer periphery of the assembled battery, and a depression is formed on the surface along the wiring path of the lead wire, and the lead wire is fixed.

In the present invention, a plurality of columnar cells are mechanically and electrically connected to each other, and plates made of an electrically insulating resin are arranged above and below having polarities. Since these plates are smaller than the outer circumference of the battery pack, even if they are visually arranged, they do not stick out from the outer circumference of the battery pack, and when the battery pack is covered with a heat shrink shrink tube, the heat shrink shrink shrinks at the edge of the plate. It is possible to prevent the tube from being damaged. In addition, since the surface of the plate has a recess formed along the wiring path of the lead wire, by disposing the lead wire in this recess, each lead wire is fixed without floating and the assembly workability is improved. In addition, the lead wire is electrically insulated by the plate in a pre-fixed state when connecting the lead wire to each unit cell, so that the solder drips or the tip of the iron tip contacts, etc. It is possible to safely connect the lead wires without the risk of a short circuit between the cells due to.

In this embodiment, if the metal busbars for mechanically and electrically connecting the unit cells are integrally formed on the plate, an assembly jig or the like for disposing the metal busbars on the assembled battery can be obtained. Is unnecessary, the number of parts and man-hours can be reduced and workability can be improved, and the plate is opened at positions corresponding to the welded portion between the bus bar and the unit cell and the welded portion between the bus bar and the lead wire, respectively. By forming the, the welding (connection) work at the connection portion can be performed easily and safely.
In addition, if positioning protrusions are formed on the plate along the side surfaces of the unit cells at the positions of the valley-shaped spaces (dead spaces) formed between the unit cells, each unit cell is positioned by the positioning protrusions at the time of installation. By restraining the movement of each other, the movement of each single cell is regulated as a whole assembled battery,
No jig is required during assembly, which is effective in terms of workability and cost. Furthermore, if the assembled battery is covered with a heat-shrinkable shrink tube, the vibration resistance of each unit cell mechanically and electrically connected to the metal busbar is improved, and the workability such as carrying is improved by making the whole unitary. In addition to being able to improve the insulation of the assembled battery, if an opening for drawing out the lead wire is formed in this heat shrinkable shrink tube, the lead wire is removed from the assembled battery covered with the heat shrinkable shrink tube. Easy to withdraw.

When four cells are used as a reference, if the cells are arranged in a square orthogonal shape and the busbar is formed in a cross shape with arms extending to each cell, the number of cells is four. The weight is received at the center of the bus bar, and the weight can be smoothly distributed in the direction of each arm. At this time, if four slits are formed in the central portion of the bus bar in a direction orthogonal to the respective extending arm directions, the central portion of the bus bar surrounded by the slits through the opening formed in the plate and the lead. By welding with the wire, the welded portion is limited to a central position equidistant from the four unit cells, and at the time of welding, the slit can prevent heat conduction to the entire bus bar. In addition, by making the bus bar located at the output end of the bus bar T-shaped, it is possible to connect two cells located at the output end when four battery cells are used as a reference. Therefore, by bending the legs extending toward the valley-shaped space formed between the unit cells substantially vertically, the output terminals (legs) are arranged in the valley-shaped space that becomes the dead space, and the volume efficiency is improved. By forming a constricted part before the leg bends, the constricted part can be intentionally blown out like a fuse due to significant heat generated by a large current when the battery is abnormal such as overcharge. As a result, the current flow can be interrupted, so that the reliability and safety of the assembled battery can be improved when the battery is abnormal.

Further, when the cells are arranged in a square orthogonal arrangement and the heat-shrinkable shrink tubes are arranged so as to cover the plates, the heat-shrinkable shrink tubes that cover the entire battery pack hide the plates arranged above and below the cells. Therefore, the electrically exposed portion can be eliminated, so that the safety can be improved. At this time, if a strip-shaped fixing member that holds the side surface of the unit cell along the outer periphery of the assembled battery is arranged in a direction orthogonal to the contraction direction of the heat-shrinkable shrink tube, in the pre-welding (connection) stage, By winding the band-shaped fixing member around the outer periphery of the assembled battery on the side surface of the battery, the looseness of the unit cell in the longitudinal direction is eliminated, the variation in the position of the unit cell is reduced, and the working efficiency can be improved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an assembled battery to which the present invention is applicable will be described below with reference to the drawings.

(Structure) As shown in FIG. 6, the assembled battery 1 of the present embodiment is entirely covered with a heat-shrinkable shrink tube 21 described later. FIG. 1 shows an assembled battery 1 before being covered with the heat-shrinkable shrink tube 21.
As shown in FIG. 1, 14 columnar cells 2 are used in the assembled battery 1. The unit cell 2 is a high-performance lithium secondary battery in which lithium manganate or the like is a main constituent material of the positive electrode mixture and amorphous carbon or the like is a main constituent material of the negative electrode mixture, and has a cylindrical shape with high thermal conductivity. It is covered with a casing. The assembled battery 1 has an electrical connection structure in which two unit cells 2 are connected in parallel and seven sets of unit cells 2 connected in parallel are connected in series. Such a connection is smaller than the outer circumference of the assembled battery 1 and is made through the plates 3 made of an electrically insulating resin and arranged above and below the 14 unit cells 2.

As shown in FIG. 2, a metal bus bar 4 is embedded in the plate 3, and the metal bus bar 4 is integrated with the plate 3 by insert molding. FIG. 3 (A),
As shown in (B), there are two types of metal busbars 4, a cross-shaped busbar 6 having a substantially cross-shaped shape and a T-shaped busbar 5 having a substantially T-shaped shape. These two kinds of metal bus bars 4 are provided on the plate 3 arranged above and below the battery pack 1.
The metal bus bars 4 of the same kind are also buried on the opposite side of the above, and the upper and lower plates 3 are arranged symmetrically in the vertical direction.

As shown in FIG. 3 (A), the cross type bus bar 6
Have arms (having equal distances) extending from the center in four directions, and the projections for welding 18 formed in a cross groove shape are formed at the tips of the arms. Has been done. A step 7 is formed between the central portion of the cross-shaped bus bar 6 and the projection portion 18, and the central portion is higher than the tip portion of the arm by the amount of the step 7, so that the displacement of the unit cell 2 is corrected or the shock is absorbed. And other functions are added. Further, four slits 8 are formed in the central portion of the cross-shaped bus bar 6 in the direction orthogonal to the respective arm directions.

On the other hand, as shown in FIG. 3B, the T-shaped bus bar 5 has arms having the same length extending from the central portion in two directions (opposite directions), and the tips of these arms are extended. The projection portion 18 for welding is formed in the shape of a cross groove.
Are formed. A step 7 is formed between the central portion of the T-shaped bus bar 5 and the projection portion 18.
On one side of the central portion of the V-shaped bus bar 5, three slits 8 are formed at equal intervals in a direction orthogonal to the arm direction, and two slits 8 are formed in the same direction as the arm direction. From the center of the T-shaped bus bar 5,
The leg extends on the opposite side of the slit 8. T-shaped bus bar 5
Is bent downward substantially vertically toward the valley-shaped space 9 (dead space) on the short side surface of the plate 3 formed between the unit cells 2 at the bent portion 10, and at the tip of the bent portion 10. Is formed with a tab 19 having a 250 series shape (see also FIG. 1). Further, the T-shaped bus bar 5 has a constricted portion 11 which is notched in a rectangular shape on both sides in the arm direction between the central portion and the front of the bent portion 10 of the leg. The constricted portion 11 has a fuse function of preventing inflow and outflow of excess current. Even if the constricted portion 11 is blown out, the constricted portion 11 is positionally positioned in the unit cell
Is formed at a position where it does not come into contact with the polar part.

As shown in FIGS. 1 and 2, one T-shaped bus bar 5 is embedded in one side of the plate 3 in a direction orthogonal to the longitudinal direction of the plate 3, and the arm is plate-shaped. Three cross-shaped busbars 6 are buried in an X shape and form an angle of 45 °. Plate openings 15 are formed in the plate 3 at 14 positions corresponding to the arm tips ahead of the step 7 of the metal bus bar 4 and having a horseshoe shape slightly larger than the arm tips. In addition, one rectangular central plate opening 22 (T-shaped bus bar 5) is provided at four locations corresponding to the slit 8 in the central portion (or one side of the central portion) of the metal bus bar 4 so as to surround the slit 8. 3) and three square-shaped center plate openings 14 (corresponding to the cross-shaped bus bar 6) are formed.

Further, a recess 12 for wiring the voltage detection line 13 is formed in the central portion of the plate 3 along the longitudinal direction while avoiding the central plate openings 22 and 14. The openings 15, 22, 14 and the recess 12 described above are formed on both sides of the plate 3 so that they can be used on both sides having different battery polarities. Also, as shown in FIG.
The voltage detection line 1 is formed by the depression 12 formed in the plate 3.
3 can be pulled out from either side of the plate 3.

As shown in FIG. 5, on one surface (rear surface) side of the plate 3, along the longitudinal direction, there are formed valley-shaped spaces 9 (dead spaces) in which the unit cells 2 are arranged, respectively. Positioning protrusion 16 along the side surface (outer diameter) of the unit cell 2
Are formed two by two. This positioning protrusion 16 is
The cross section has a shape of a substantially right triangle, and the hypotenuse thereof is curved so as to correspond to the outer diameter of the unit cell 2. A positioning protrusion 16 having a substantially isosceles triangular cross section is formed in the center of the short side surface portion of the plate 3 which is orthogonal to the longitudinal direction. The two oblique sides of the positioning protrusion 16 formed on the short side surface portion are curved so as to correspond to the outer diameter of the unit cell 2.

(Preparation of Battery Assembly) Next, the procedure for manufacturing the battery assembly 1 of this embodiment will be described. The present embodiment is an example in which the voltage detection line 13 is drawn from the cross-shaped bus bar 6 side of the upper plate 3 and the T-shaped bus bar 5 side of the lower plate 3.

As shown in FIGS. 2 and 4, on the surface of the plate 3 (the surface on which the positioning protrusions 16 are not formed), the voltage detection line 13 to which the connector is connected in advance is arranged in the recess 12 and is bonded with an adhesive. It is adhered or fitted so as to fit along the depression 12 and fixed. At this time, the connector is located on the upper plate 3 on the cross-shaped bus bar 6 side and on the lower plate 3 on the T-shaped bus bar 5 side. Since two plates 3 are required for the upper and lower sides of the assembled battery 1, such fixing work is performed for the two plates 3 of the assembled battery 1. Next, the voltage detection line 1 is passed through the four central plate openings 22 and 14 formed in each of the two plates 3.
The end portion of 3 is connected to the central portion (or one side of the central portion) of the metal bus bar 4 in the slit 8 by solder welding. At this time, since the unit cells 2 are electrically connected to the metal bus bars 4 in series and parallel, the work is safe and the work efficiency is high.

Next, as shown in FIG. 5, with the surface of one plate 3 facing down, the unit cells 2 are arranged in units of two between the positioning protrusions 16. Although the unit cell 2 is shown as being arranged from the right side in FIG. 5, it may be arranged from the left side. Then, as shown in FIG. 1, after the 14 unit cells 2 are arranged, another plate 3 is placed from the upper side.
Is adjusted so that each unit cell 2 is positioned in the positioning protrusion 16 and covered. Then, a fixing tape 17 is attached to the side surface of each unit cell 2 along the outer periphery of the assembled battery 1 approximately at the center in the height direction.
The winding of more than one turn prevents the individual cells 2 from floating.

Then, the welding projection portion 18 of the metal bus bar 4 and each unit cell 2 are spot-welded through the 14 plate openings 15 formed in the plate 3 to mechanically connect between each unit cell 2. Connect electrically. Next, with respect to the plate 3 which is upside down (turned over) and is the upper side (disposed on the lower side before turning over), the assembled battery 1 and the welding projection portion 18 of the metal busbar 4 are similarly processed. Each unit cell 2 is spot-welded to connect each unit cell 2 mechanically and electrically. As a result, 14 of the unit cells 2 are connected in parallel, and 7 sets of the unit cells 2 connected in parallel are connected in series (state shown in FIG. 1).
At this time, the two connectors connected to the voltage detection line 13 are arranged so that they can be taken out from one side of the assembled battery 1, and the connection distance to the device (voltage controller) that controls each unit cell 2 is shortened. The workability can be improved.

Next, the power lead wire 20 is connected to the tab 19 of the T-shaped bus bar 5 by solder welding, and one power lead wire 20 is placed on the upper side of the plate 3 and one side of the assembled battery 1 ( The power lead wire 20 is positioned on the same side as the voltage detection line 13 (see FIG. 6).
The other side of the power lead wire 20 is connected to the tab 19 of the T-shaped bus bar 5 on the outer side of the plate 3 similarly arranged on the lower side by soldering and is drawn to the same side as the voltage detection line 13. Then, as shown in FIG. 6, the voltage detection wire 13 and the power lead wire 20 are gathered in one place, and the cylindrical heat-shrinkable shrink tube 2 is provided between the plates 3 arranged above and below.
Insert 1 and heat shrink. The heat shrinking direction of the heat shrinkable shrink tube 21 is a direction orthogonal to the length direction of the unit cell 2, in other words, the direction around which the fixing tape 17 is wound. As a result, on both sides of the short side surface of the battery pack 1,
An opening is formed in the heat-shrinkable shrink tube 21, and the voltage detection line 13 and the power lead wire 13 are pulled out from one of the openings.

(Operation and the like) Next, the operation and the like of the assembled battery 1 of the present embodiment will be described.

In the assembled battery 1 of this embodiment, a plurality of columnar cells 2 are arranged side by side with their electric polarities alternately changed, electrically connected by a conductive metal bus bar 4, and made of an electrically insulating resin plate. Covered with 3. Since the plate 3 is smaller than the outer periphery of the battery pack 1, it does not protrude from the outer periphery of the battery pack 1 even by visual arrangement. Therefore, when the heat-shrinkable shrink tube 21 is heat-shrinked, the edge does not come out from the outer circumference, so that the heat-shrinkable shrink tube 21 is not damaged and the risk of inducing an external short circuit can be eliminated. Further, since the depressions 12 are formed on the surface of the plate 3 along the wiring path of the voltage detection lines 13, by arranging (adhering) the voltage detection lines 13 in the depressions 12 respectively, Voltage detection line 13
Is fixed without floating and the workability is improved. Furthermore,
When connecting the voltage detection line 13 to each unit cell 2 when connecting the wiring with solder or the like in a state where the battery pack 1 is not insulated, the wiring may be dripping or the tip of the soldering iron may touch. Although there is a risk that a short circuit may occur between the unit cells 2, in this embodiment, the voltage detection line 13 is insulated by the plate 3 made of an electrically insulating resin, which is arranged and fixed in advance. The voltage detection line 13 can be safely connected by the insulation between the unit cells 2 without the detection line 13 moving.

Further, in the present embodiment, the metal bus bar 4 for electrically connecting the unit cell 2 to the plate 3 made of electrically insulating resin.
Are integrally molded. Therefore, no assembly jig or the like is required when disposing the metal bus bar 3 in the assembled battery 1.
The number of parts and man-hours are reduced and workability is improved. Further, openings 14, 15, and 22 are formed in the plate 3 only at the connection points between the metal busbar 4 and the unit cell 2 and the voltage detection line 13, so that the unit cell 2 and the metal busbar 4 can be easily welded. Since the connection between the metal bus bar 4 and the voltage detection line 13 is performed in advance as a pre-process, the work can be performed without worrying about an electrical short circuit, so that workability and safety are improved.

Further, in this embodiment, on the surface of the plate 3 that contacts the unit cells 2, the positioning projections 16 along the side faces of the unit cells 2 are provided in the valley spaces 9 (dead spaces) existing between the unit cells 2. It is arranged. Since the positioning protrusions 16 are located between the unit cells 2, the shape corresponding to the side faces of the unit cells 2 is bilaterally symmetric when viewed from the center of the protrusions. The movement of each unit cell 2 as a whole of the assembled battery 1 is regulated by being positioned by and restraining the movement of each other. Therefore, no jig is required during assembly, which is effective in terms of workability and cost.

Further, in the assembled battery 1 of this embodiment, the unit cells 2 are electrically and mechanically connected to each other by the metal bus bar 4, but in the sense of vibration resistance, each unit cell 2 is insufficiently fixed. It is necessary to integrate the cage battery 1 as a whole. For this reason,
By covering the entire assembled battery 1 with the heat-shrinkable shrink tube 21, the insulating property is enhanced, and by integrating the whole, the workability such as carrying is improved. In addition, the openings for taking out the voltage detection lines 13 and the like of each unit cell 2 are formed in the short side surface portion by heat-shrinking the cylindrical heat-shrinkable shrink tube 21, and the dead space between the unit cells 2 is reduced. It effectively utilizes the space efficiency of the resulting position.

Furthermore, the present embodiment is a connection structure in which the unit cells 2 are arranged side by side in a square orthogonal shape, and the two unit cells 2 have the same electrical polarity. Considering four unit cells 2 as a basic, if the distance from the amount of electricity flowing through the metal bus bar 4 to each unit cell 2 is not the same for all four units, the heat generation balance is lost and the unit cell 2 is connected to one unit cell 2. Only one part generates heat more than the other, and in the worst case, melting occurs. Therefore, 4
The cross-shaped bus bar 6 that provides a uniform length to the single cell 2 has the most stable shape, and the weight of the four single cells 2 is the same as the strength of the cross-shaped bus bar 6 after welding. By the central portion of the, the weight distribution in each arm direction is smoothly performed. Further, in this embodiment, the metal bus bar 4 needs to be connected to the voltage detection line 13. Therefore, since a heat source is required depending on the connecting method, in order to connect with the minimum required amount of heat, it is necessary to limit the connecting points and to have a shape that suppresses the spread of heat to the entire metal bus bar 4 as much as possible. . Furthermore, if the distance from each unit cell 2 is not equidistant at the connection point, it is difficult to accurately detect the battery voltage due to the voltage drop due to the distance. Therefore, the assembled battery 1 of the present embodiment
Then, in the central portion of the metal bus bar 4 most suitable as the connection position of the voltage detection line 13, a slit 8 for suppressing the spread of heat is provided in a direction orthogonal to the direction in which the arms extend, and in each arm direction. The four slits 8 were formed to prevent the spread of heat, and the central portion of the slit 8 was connected to the voltage detection line 13 by spot welding.

Further, in the assembled battery 1 of the present embodiment, the cross type bus bar 6 is based on the four unit cells 2, so that the two unit cells 2 are not connected at the end thereof. Therefore, in order to make these two unit cells 2 an electric output in the assembled battery 1, a T-shaped T-shaped bus bar 5 having a T-shape is connected as a bus bar shape. The leg extending vertically from the portion connecting the unit cells 2 extends to the valley-shaped space 9 between the unit cells 2 and is bent at a right angle. That is,
Since the valley-shaped space 9 between the unit cells 2 is a dead space,
The volume efficiency of the assembled battery 1 is improved by making that portion a connection space for electric output. Moreover, the unit cell 2
Constricted part 1 in front of bent part 10 with almost no contact with
By forming 1, the cross-sectional area of the T-shaped bus bar 5 in the constricted portion 11 is intentionally reduced. That is, when the assembled battery 1 reaches the overcharged state, the constricted portion 11 on the highest potential side is intentionally blown by the remarkable heat generation due to the large current, like the fuse, so that the current flow is interrupted. , The reliability and safety of the assembled battery 1 are improved.

Further, in this embodiment, the unit cells 2 are arranged side by side in a square orthogonal manner, and the plates 3 are arranged on the upper and lower surfaces of the polarities of the unit cells 2. By disposing the heat-shrinkable shrink tube 21 that covers the entire assembled battery 1 so that the plate 3 is hidden, the electrically exposed portion can be eliminated, so that the safety of the assembled battery 1 can be improved.

Further, before welding the unit cell 2 to the metal bus bar 4, it is difficult to limit the position of the unit cell 2 in the longitudinal direction of the assembled battery 1 only by the plate 3, and this also causes trouble in the movement of the work. I will end up. Therefore, in the present embodiment, the assembled battery 1 on the side surface of the unit cell 2 is formed before welding.
By winding the fixing tape 17 along the outer periphery, the looseness in the longitudinal direction is eliminated, the variation in the position of the unit cell 2 in the movement of the work is reduced, and the work efficiency is improved.

In this embodiment, the voltage detection line 13 and the power lead wire 20 are drawn to one side, but
The voltage detection line 13 and the power lead wire 20 may be pulled out from opposite sides.

Further, in the present embodiment, the example in which the depression 12 for the voltage detection line 13 is formed in the plate 3 is shown, but in addition to this, the depression for the power lead wire 20 may be formed. By doing so, the work of pulling one of the power lead wires 20 drawn out from one side of the plate 3 to the other side of the plate 3 is further facilitated.

Further, in this embodiment, an example in which the constricted portion 11 is cut out is shown. However, since the constricted portion 11 is intended for fusing at the time of overcharge, the leg of the T-shaped bus bar 5 is predetermined. It is also possible to fuse by reducing the length.

Further, in this embodiment, the metal bus bar 4 is replaced by 2
Although an example in which two unit cells 2 are connected in parallel and seven sets of unit cells 2 connected in parallel are connected in series has been shown by preparing types, for example, when connecting 12 unit cells 2 Is T
The letter-shaped bus bar 5 is unnecessary. Therefore, the assembled battery 1 of the present embodiment can also cope with a change in the number of the unit cells 2. In this case, it is preferable to form the output terminal and the constricted portion on the cross type bus bar 6 on the highest potential side.

[0037]

As described above, according to the present invention,
A plurality of columnar cells are mechanically and electrically connected to each other, and plates made of electrically insulating resin are arranged on the upper and lower sides with polarity.These plates are smaller than the outer circumference of the assembled battery, so it is a visual arrangement. However, it does not stick out from the outer periphery of the battery pack, and when the battery pack is covered with a heat-shrinkable shrink tube, it is possible to prevent the heat-shrinkable shrink tube from being damaged at the edge of the plate. Since the recess is formed along the wiring path of the lead wire, by disposing the lead wire in the recess, the respective lead wires are fixed without floating and the assembling workability can be improved. At the same time, when the lead wire is connected to each unit cell, the lead wire is electrically insulated by the plate in a pre-fixed state. Without the risk of short circuit between the unit cells due to previous contact occurs, it is possible to perform safely the lead wire connection, the effect can be obtained as.

[Brief description of drawings]

FIG. 1 is an external perspective view of an assembled battery of an embodiment to which the present invention can be applied before coating a heat-shrinkable shrink tube.

FIG. 2 is a plan view of a plate.

FIG. 3 is an external perspective view of a metal bus bar, in which (A) shows a cross bus bar and (B) shows a T-shaped bus bar.

FIG. 4 is a plan view of the plate after welding the voltage detection line to the depression, where (A) shows the upper plate and (B) shows the lower plate.

FIG. 5 is an external perspective view when a unit cell is provided.

FIG. 6 is an external perspective view of an assembled battery.

[Explanation of symbols]

1 set battery 2 columnar cells 3 plates 4 metal bus bars 5 T-shaped bus bars (part of metal bus bars) 6 Cross-shaped bus bars (part of metal bus bars) 8 slits 9 valley space 10 Bend 11 constriction 12 depressions 13 Voltage detection wire (lead wire) 14 Central plate opening (opening) 15 Plate opening (opening) 16 Positioning protrusion 17 Fixing tape (fixing member) 21 heat shrink shrink tube 22 Center plate opening (opening)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiaki Onuki             2-8-7 Nihonbashihonmachi, Chuo-ku, Tokyo             Inside Shin-Kobe Electric Machinery Co., Ltd. (72) Inventor Kensuke Goto             2-8-7 Nihonbashihonmachi, Chuo-ku, Tokyo             Inside Shin-Kobe Electric Machinery Co., Ltd. F-term (reference) 5H040 AA03 AT01 AY09 AY10 DD03                       DD05 DD13 LL08

Claims (9)

[Claims] 1. An assembled battery in which a plurality of columnar cells are mechanically and electrically connected to each other and plates of electrically insulating resin having polarities are arranged above and below the outer periphery of the assembled battery. An assembled battery, characterized in that a depression is formed on a surface along a wiring path of a lead wire, and the lead wire is fixed. 2. A metal busbar for mechanically and electrically connecting the unit cells is integrally formed on the plate, and a welded portion between the busbar and the unit cell and the busbar are provided. The assembled battery according to claim 1, wherein openings are formed at positions corresponding to welded portions with the lead wires. 3. The plate according to claim 1 or 2, wherein the plate has a positioning protrusion along a side surface of the unit cell at a position of a valley-shaped space formed between the unit cells. The assembled battery described in. 4. The assembled battery is covered with a heat-shrinkable shrink tube, and the heat-shrinkable shrink tube is formed with an opening for drawing out the lead wire. Any one of claim 3
The assembled battery according to item. 5. The set according to claim 2, wherein the unit cells are arranged in a square orthogonal shape, and the bus bar has a cross shape in which an arm extends to each unit cell. battery. 6. The battery pack according to claim 5, wherein the bus bar has four slits formed in a central portion thereof in a direction orthogonal to the respective extending arm directions. 7. One of the bus bars arranged at the output end of the bus bar has a T-shape, and a leg extending toward a valley-shaped space formed between the unit cells is provided. The assembled battery according to claim 2, wherein the assembled battery is bent substantially vertically and has a constricted portion before the leg is bent. 8. The assembled battery according to claim 4, wherein the unit cells are arranged in a square orthogonal shape, and the heat-shrinkable shrink tubes are arranged so as to cover the plates. 9. The strip-shaped fixing member for holding the side surface of the unit cell along the outer periphery of the assembled battery is arranged in a direction orthogonal to the contracting direction of the heat-shrinkable shrink tube. Batteries.