JP4902128B2 - Battery case and battery - Google Patents

Description

  The present invention relates to a battery case suitable for storing a plurality of small-diameter cylindrical batteries (for example, AA batteries) and using them as substitutes for large-diameter cylindrical batteries (for example, AA batteries).

  Batteries used as power sources for various electronic devices are roughly classified into round unit cells and flat unit cells, for example, depending on their external dimensions. Among them, a typical cylindrical battery as a round unit cell is a single type. The battery is classified into a battery (R20), an AA battery (R14), an AA battery (R6), an AAA battery (R03), and the like. And in order to use the battery according to the specification, an electronic device is normally provided with the battery accommodating part which formed the space according to the kind (appearance dimension) of the battery made into use object.

On the other hand, a column case (battery spacer) having an external size of a single AA battery accommodates 1 to 3 AA batteries, or a pair of terminal support boards supported via a support column. It is proposed that four AA batteries are fitted as the center of the battery and used in the same manner as the AA batteries (see, for example, Patent Documents 1 and 2). It has also been proposed to incorporate a diode in the battery adapter that houses the battery and adjust the output electromotive force using the voltage drop across the diode (see, for example, Patent Document 3).
Japanese Patent Publication No.58-661 Japanese Patent Laid-Open No. 6-187554 Japanese Patent Laid-Open No. 11-40119

  By the way, when using an AA battery in the same manner as an AA battery, in general, from the viewpoint of battery capacity, as many AA as possible in a cylindrical battery case having approximately the same external dimensions as an AA battery. It is desirable to house a battery. However, as shown in Patent Document 1, when a cylindrical battery case is used, a maximum of three AA batteries can only be accommodated due to restrictions on the battery diameter (outer diameter). On the other hand, as shown in Patent Document 2, when AA batteries are sandwiched between a pair of terminal support boards supported via support columns, four AA batteries can be used. However, in the battery case having such a strut structure, the battery is easily detached (is easy to drop off), and there is a problem in its handleability.

  The present invention has been made in consideration of such circumstances, and the object of the present invention is to accommodate a large number of batteries within a range that satisfies the dimensional constraints, and to prevent unintentional dropping of the batteries. An object of the present invention is to provide a battery case with good handleability.

In order to achieve the above-described object, the battery case according to the present invention has an appearance dimension (diameter and length) substantially equal to that of a large-diameter cylindrical battery, and a plurality of small-diameter cylindrical batteries are arranged inside the battery case. Can be accommodated,
<a> Case body,
<b> A slit that is provided on the peripheral side portion of the case main body and that exposes a part of the peripheral side surface of the cylindrical battery housed therein, preferably a plurality of slits;
<c> Positive terminal and negative electrode side connection terminals respectively connected to the positive electrode and the negative electrode of a plurality of cylindrical batteries provided inside the both ends of the case body and housed therein,
<d> A positive electrode terminal and a negative electrode terminal that are provided on both outer sides of the case body and are connected to the connection terminals on the positive electrode side and the negative electrode side, respectively.

Preferably, as described in claim 2, the case main body includes a case body that is provided so as to be detachably divided into two parts.
Each said case body is implement | achieved as what was provided with the engaging part which connects each said case body mutually so that it may oppose the valley formed between the surrounding side surfaces of the some cylindrical battery accommodated.
More preferably, each case body is realized as a bottomed cylindrical positive electrode side case body and negative electrode side case body divided in the axial direction.

According to a fourth aspect of the present invention, the case main body has a main body portion and a hinge portion connected to the main body portion at one end, and an engaging portion detachably connected to the main body portion at the other end. The lid portion may be provided so as to be freely opened and closed with respect to the main body portion.
By the way, the case body has a cylindrical or polygonal outer shape (for example, octagonal shape) having substantially the same external dimensions as the single-type battery, as described in claim 5, for example, and the small-diameter cylinder is formed therein. This is realized by storing four AA batteries as the battery. Note that the case body may have an appearance dimension substantially the same as that of the AA batteries, and may be realized by storing four AAA batteries as the small-diameter cylindrical batteries side by side.

  Preferably, one of the connection terminals allows contact connection of one of the positive electrode and the negative electrode projecting at one end of the cylindrical battery, and the cylindrical battery includes It is desirable to provide a rib for preventing the contact of the other flat electrode forming the other end. This rib is formed, for example, around the connection terminal on the positive electrode side, and has a slightly lower height than the protruding length of the positive electrode in which the positive electrode protruding at one end of the cylindrical battery enters inside. Realized as a ring-shaped protrusion.

According to a seventh aspect of the present invention, each of the cylindrical batteries is preferably connected to a positive electrode or a negative electrode terminal through a reverse current blocking diode. For example, as described in claim 8, the diode may be mounted on a circuit board together with the positive or negative connection terminal and incorporated in the end of the case body. At this time, it is desirable to insert a fuse or a PTC (positive temperature coefficient resistance element) as an eddy current protection element in series with the diode. And it is desirable to mount this fuse or PTC on the circuit board.
The battery of the present invention has an external dimension substantially the same as that of a large-diameter cylindrical battery, and has a plurality of small-diameter cylindrical batteries arranged therein, and has a bottom portion that is divided in the axial direction. Each of the positive electrode side case and the negative electrode side case body, and each of the positive electrode side and the negative electrode side respectively connected to the positive electrode and the negative electrode of a plurality of cylindrical batteries provided inside the both ends of each case body and housed therein A connection terminal; and a positive electrode terminal and a negative electrode terminal that are provided outside both end portions of each case body and are connected to the connection terminals on the positive electrode side and the negative electrode side, respectively. It has the peripheral side part arrange | positioned with the space | interval which enters and exposes a part of peripheral side surface of the cylindrical battery accommodated.

According to the configuration of the first aspect of the present invention, the slit is provided on the peripheral side surface of the case main body, and a plurality of batteries are mounted on the case main body in a state where a part of the peripheral side surface of the battery is fitted into the slit. Since it is housed, many batteries can be housed side by side in the case body without being dimensionally restricted by the peripheral side surface (peripheral wall) of the case body. In other words, the maximum outer diameter when the peripheral surfaces of the plurality of batteries housed in the case body are arranged in close contact with each other and the maximum diameter formed by the peripheral surface of the case body can be set to be approximately equal. The substantial outer diameter of the peripheral side surface of the case main body required for storing the batteries of the book side by side can be reduced.
Moreover, the battery of this invention can accommodate many batteries side by side in the case body similarly to the above, without receiving the dimension restrictions by the surrounding side surface (peripheral wall) of each case body.

  According to the second aspect of the present invention, the case main body is divided into two parts so that each case body is detachable, thereby making it easier to store the cylindrical battery. At this time, the engaging portion for attaching and detaching the case bodies to each other faces the valley formed between the peripheral side surfaces of the plurality of cylindrical batteries stored side by side in the case main body in the peripheral side portion of the case body, Since it is provided in a so-called dead space (excess space) inside the case main body, the engaging portion does not become an obstacle to housing a plurality of batteries. Therefore, a plurality of small-diameter cylindrical batteries can be accommodated therein while maintaining the external dimensions (diameter and length) substantially the same as those of the large-diameter cylindrical battery.

Further, according to the configuration of the third aspect, since each case body is divided in the axial direction, it can be inserted in the axial direction when storing the cylindrical battery, and can be stored more easily. .
On the other hand, when configured as in claim 4, the case body is composed of a main body portion and a lid portion, and is connected by a hinge portion. Therefore, the case is divided while facilitating the storage of the cylindrical battery. Therefore, the lid portion can be prevented from being lost and can be easily attached and detached by opening and closing the lid portion.

Further, according to the configuration of claim 5, since the outer shape of the case main body is compatible with the AA battery, it can be adapted to a device driven by the AA battery and has four AA batteries. Since the battery can be stored, the battery capacity or battery voltage can be increased as compared with the conventional battery case.
According to the structure of claim 6, one of the connection terminals is allowed to contact and connect one of the positive electrode and the negative electrode protruding from one end of the cylindrical battery, and the other end of the cylindrical battery. If a rib for preventing the contact of the other flat electrode forming the part is provided, even if the battery is accommodated in the reverse direction, electrical connection to the battery can be prevented. Accordingly, there will be no inconvenience such as a short circuit accident caused by the reverse direction (polarity) of the battery stored in the battery case. That is, it is possible to sufficiently ensure safety when a plurality of batteries are housed in the battery case.

  Furthermore, according to the structure of claim 7, not only can the directions of the currents drawn from the plurality of batteries be made uniform, but also the battery voltage (battery performance) of the plurality of batteries housed in the case body. Even if there is a difference, it is possible to reliably prevent the occurrence of a reverse current due to the difference. Therefore, in this respect as well, it is possible to prevent the occurrence of a short-circuit accident caused by reversing the direction (polarity) of the battery stored in the battery case. It is possible to sufficiently enhance the above safety.

  At this time, as described in claim 8, if a plurality of diodes are mounted on the circuit board together with the connection terminals on the positive electrode side or the negative electrode side, and the circuit board is incorporated in the end portion of the case body, the manufacturing ( Assembling) The workability can be facilitated and the manufacturing cost of the battery case can be reduced.

Hereinafter, a battery case according to an embodiment of the present invention will be described with reference to the drawings.
The battery case according to this embodiment is used as an alternative to a single battery by storing four AA batteries side by side, and has an external shape as shown in FIG. Yes.
In other words, this battery case is mainly composed of a pair of bottomed cylindrical positive electrode case body 10 and negative electrode case body 20 which are detachably provided in the axial direction, and form a pair of these case bodies. Four AA batteries BAT are arranged and housed side by side in a case body formed by combining 10 and 20. The positive side case body 10 and the negative side case body 20 each have an outer diameter (34.2 mmφ) D that is substantially the same as that of a single battery, and the case bodies 10 and 20 are connected to each other in the axial direction. The size of the battery is approximately the same length (61.5 mm) L as the single battery. Incidentally, the outer diameter d of the AA battery BAT is 14.5 mmφ, and its length is 50.5 mm.

  In particular, on the peripheral side portions 11 and 21 of the case bodies 10 and 20, four slits 12 and 22 having a predetermined width (for example, a width of 10 mm) extending along the axial direction are equiangularly spaced in the circumferential direction ( At intervals of 90 °). As shown in FIG. 2, the slits 12 and 22 are provided on the respective circumferential side surfaces of the four AA batteries BAT housed in the case bodies 10 and 20 (case body). A portion positioned toward the outside of the AA battery BAT is provided so as to enter, and a part of the peripheral side surface of each AA battery BAT is exposed through the slits 12 and 22.

  That is, when the four AA batteries BAT are arranged in a square shape with their peripheral surfaces abutting each other as shown in FIG. 2, the maximum width of the lump formed by these AA batteries BAT is approximately 35 in the diagonal direction. 0.7 (= 14.5 + 14.5√2) mm, which is slightly larger than the outer diameter (34.2 mmφ) D of the case bodies 10,20. The slits 12 and 22 described above form so-called escape portions from the peripheral side portions 11 and 21 of the case bodies 10 and 20 of the four AA batteries BAT arranged in this manner. By inserting a part of the peripheral side portion of the AA battery BAT, as shown in FIG. 2, the inside of each case body 10, 20 having an outer diameter (34.2 mmφ) D that is substantially the same as that of the AA battery. The four AA batteries BAT can be stored.

  In addition, these case bodies 10 and 20 are axially connected to each other on the peripheral side portions 11 and 21 that are located between the slits 12 and 22 and intermittently form the cylindrical peripheral walls of the case bodies 10 and 20. A pair of engaging portions for detachably connecting and integrating are provided. By the way, the peripheral side portions 11 and 21 forming a cylindrical peripheral wall intermittently are arranged between the peripheral side surfaces of the four AA batteries BAT which are stored side by side in the case bodies 10 and 20. The part which confronted the valley formed in is formed. The engaging portions are provided, for example, in a rectangular fitting hole 13 provided in the peripheral side portion 11 of the positive electrode side case body 10 and in the peripheral side portion 21 of the negative electrode side case body 20. And the engaging claw 23 engaged from the inside of the positive electrode case body 10.

  That is, the peripheral side portions 11 and 21 of the case bodies 10 and 20 are separated from the peripheral side surfaces of the AA batteries BAT accommodated in the case bodies 10 and 20 while being fitted in the slits 12 and 22 as described above. Between the peripheral side portions 11 and 21 and a valley formed between the peripheral side surfaces of the plurality of AA batteries BAT butted against each other. It is a dead space (surplus space). The engaging portion from the fitting hole 13 and the engaging claw 23 described above is provided by using such a dead space of the case bodies 10 and 20, and the presence thereof hinders the storage of the AA battery BAT. It is supposed not to come.

  Specifically, as shown in FIG. 3 in a state where the negative electrode side case body 20 is removed from the positive electrode side case body 10 in the battery case, the fitting hole 13 is a substantially central portion of the peripheral side portion 11 of the positive electrode side case body 10. Is open. Further, the engaging claw 23 protrudes outward from the tip of a tongue piece 24 extending from the peripheral side portion 21 of the negative electrode side case body 20. In particular, the tongue piece 24 is set so as to enter the peripheral side portion of the positive electrode case body 10 while being bent inward when the negative electrode case body 20 is coupled to the positive electrode case body 10 from its own direction. Has been. When the opening ends of the case bodies 10 and 20 are brought into contact with each other, the tongue piece 24 is elastically restored, and the engaging claw 23 projecting from the distal end thereof is inserted into the fitting hole 13 from the inside of the peripheral side portion 11. The case bodies 10 and 20 are coupled and integrated with each other.

  On the other hand, a cross-shaped connection terminal 14 is provided on the inner bottom of the positive electrode case 10 as shown in FIG. 4 and is electrically connected to the respective positive electrodes of the four AA batteries BAT. Yes. As shown in FIG. 1, the connection terminal 14 is electrically connected to a cap-like positive electrode 15 projecting from the bottom outer surface of the positive electrode case body 10 (end surface of the cylindrical case body). The four AA batteries BAT are collectively connected to the positive electrode 15 together. A ring-shaped rib 16 is provided on the inner bottom portion of the positive electrode case 10 so as to surround the connection terminal 14. These ribs 16 allow contact connection of a positive electrode (not shown) protruding from one end of the AA battery BAT to the connection terminal 14 on the positive electrode side, and form the other end of the AA battery BAT. It plays a role of preventing contact of a flat negative electrode (not shown). Specifically, the ring-shaped rib 16 forms a recess into which the positive electrode of the AA battery BAT can enter, and is realized as a protrusion having a height lower than the protruding length of the positive electrode of the AA battery BAT. Yes.

  On the other hand, as shown in FIG. 5, the inner bottom portion of the negative electrode case 20 is formed of a tongue-like elastic piece 4 electrically connected to each negative electrode of the four AA batteries BAT. Two connection terminals 25 are provided. In particular, these connection terminals 25 are respectively mounted on a printed circuit board 26 incorporated in the inner bottom portion of the negative electrode side case body 20, and are attached to the inner bottom portion of the negative electrode side case body 20 together with the printed circuit board 26. It is like that. The printed circuit board 26 is mounted with four diodes 27 corresponding to the connection terminals 25 and a PTC (positive temperature coefficient resistance element) 28 as an eddy current protection element. Each connection terminal 25 is connected in common via a diode 27 as shown in FIG. 6 and further connected to a negative electrode 29 provided in the negative case body 20 via a PTC 28. Yes.

  The negative electrode 29 connected to the plurality of negative-side connection terminals 25 via the diode 27 and further via the PTC 28 cooperates with the positive electrode 15 connected to the positive-side connection terminal 14 described above. As described above, the four AA batteries BAT, which are accommodated in the case bodies 10 and 20 (cylindrical case main body) and inserted between the connection terminals 14 and 25, are connected in parallel, It plays a role of functioning as an electrode for external connection.

  Note that the negative electrode 29 is formed of, for example, a flat plate-shaped electrode body provided at the center of the bottom outer surface of the negative electrode case 20 as shown in FIG. The negative electrode 29 penetrates through the bottom of the negative case body 20 and is connected to the printed circuit board 26, so that the negative electrode 29 is electrically connected from the PTC 28 to the negative connection terminal 25 via the diode 27. It has become so. In particular, each of the diodes 27 is set in polarity (orientation) so that a current flows from the negative electrode 29 toward the connection terminal 25, and serves to prevent the reverse current from flowing to the AA battery BAT. I'm in charge. Each diode 27 also plays a role of preventing unintentional current from flowing between the four AA batteries BAT.

  Incidentally, a diode generally causes a voltage drop of about 0.5 V. Therefore, when four AA batteries BAT are connected in parallel through the diode 27 as described above, the size of the AA Ni-MH battery BAT is reduced. It cannot be denied that the voltage extracted from the positive electrode 15 and the negative electrode 29 with respect to the rated output voltage of 1.2 V decreases to about 0.7 V. In the case of an AA type dry battery, the rated output voltage is 1.5V, so the voltage taken out from the positive electrode 15 and the negative electrode 29 is reduced to about 1.0V. However, many electronic circuits that use a battery as a power source are equipped with a low voltage circuit whose operation guarantee voltage is about 0.6V. Therefore, when a battery case containing the AA battery BAT is used as a power source for this type of electronic device as a substitute for the AA battery, the voltage drop due to the diode 27 described above does not become a problem. Some devices require an operation guarantee voltage higher than the output voltage described above. In this case, a diode having a small voltage drop may be used, or an output voltage adjustment circuit may be incorporated.

  Thus, according to the battery case configured as described above, the four AA batteries BAT are accommodated in the case bodies 10 and 20 that are connected in the axial direction and have substantially the same external dimensions as the AA batteries. It can function as a battery replacement. In particular, by partially exposing the peripheral side portion of the AA battery BAT through the slits 12 and 22 described above, it is possible to effectively remove the four AA batteries BAT while maintaining the overall shape and dimensions thereof. Can be stored. In addition, since the four AA batteries BAT are surrounded by the peripheral side portions of the case bodies 10 and 20, it is possible to reliably prevent the AA batteries BAT from falling off and to improve the handleability. . In addition, since the engaging portion for detachably connecting the case bodies 10 and 20 is provided using the dead space (excess space) of the case bodies 10 and 20, the storage of the AA battery BAT is hindered. There is nothing to do.

  Since the rib 16 is provided around the positive side connection terminal 14 as described above, even if the direction of the AA battery BAT is reversed by mistake, the electrical connection (contact) with the AA battery BAT is prevented. Since it is blocked, it is safe to handle. In addition, since the direction of the current with respect to the AA battery BAT is limited by the diode 27 individually connected in series to the connection terminal 25 on the negative electrode side, the battery case with the direction (polarity) of the AA battery BAT wrongly reversed. No current flows from the AA battery BAT. Therefore, the safety is also high in this respect.

  Furthermore, since the diode 27 is inserted in series for each AA battery BAT, for example, even when AA batteries BAT of different battery capacities (battery characteristics) are mixed and stored, No unintentional current flows between the three batteries BAT. That is, even if there is a difference in the battery capacity (battery performance) of the plurality of AA batteries BAT, it is possible to reliably prevent the occurrence of reverse current and to ensure sufficient safety. it can. Furthermore, if a plurality of electrode terminals 25, diodes 27, and the like are mounted using the printed circuit board 26 as described above, the manufacturing can be facilitated, and the manufacturing cost can be reduced. There are also great practical advantages.

  The present invention is not limited to the embodiment described above. For example, it is of course possible to provide an engaging claw on the positive side case body 10 and provide a fitting hole in the negative side case body 20 to engage with the engaging claw, and other connecting structures can of course be adopted. It is. The diode 27 may be provided on the positive electrode side. Further, the PTC 28 may be omitted, or a battery case may be constructed by mounting a fuse instead of the PTC 28. Needless to say, if a diode 27 having a forward drop voltage of about 0.2 V is used, it is possible to suppress a decrease in the voltage extracted from the positive electrode 15 and the negative electrode 29.

  In the embodiment described above, a plurality of cylindrical batteries are connected in parallel. However, these batteries can be used in appropriate series connection. That is, a plurality of batteries are connected in series in anticipation of a voltage drop at the diodes connected in series to the batteries, and the voltage taken out via the positive electrode 15 and the negative electrode 29 is set high, or the output voltage of It is also possible to configure so as to obtain a rated voltage by incorporating an adjustment circuit.

  In addition, here, a battery case in which four AA batteries are housed in a case body having an appearance dimension substantially equivalent to that of an AA battery has been described as an example. , 4 AAA batteries (outer diameter 10.5 mm, 44.5 mm length) or 4 AAA batteries (outer diameter 12.0 mm, length 30). .2 mm) can be similarly applied.

  Furthermore, when the four AA batteries BAT are arranged side by side in a rhombus shape as shown in FIG. 7, for example, in the case body having substantially the same external dimensions as the AA batteries, the above-described slits are provided at two locations. Is sufficient. Further, depending on the battery diameter, it is possible to provide a slit only at one location. Further, in place of the above-described two-divided structure, the case main body can be realized as a structure in which a part of the peripheral wall of the cylindrical case main body, for example, approximately half of the peripheral wall is formed as an openable / closable lid as shown in FIG. is there. In this case, the lid may be provided so as to be opened laterally, or may be provided so as to be detachable from the semi-cylindrical case body.

  Furthermore, the case body can be realized as a cylindrical body having a polygonal shape (in this example, an approximately octagonal shape) as shown in FIG. At this time, if the peripheral wall is formed by alternately arranging circular arc surfaces and planes, and if it is realized to be almost cylindrical as a whole, so-called squareness can be eased, so it feels strange when held in the hand. Can be reduced. In short, it is sufficient to determine the external shape according to the shape of the battery compartment in the device used. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

The perspective view which shows schematic structure of the battery case which concerns on one Embodiment of this invention. The cross-sectional view which shows the arrangement structure of the battery accommodated in a battery case. The perspective view which shows the state which isolate | separated the positive electrode side case main body and negative electrode side case main body of the battery case shown in FIG. The figure which shows the structure of the inner bottom face of a positive electrode side case main body. The figure which shows the structure of the inner bottom face of a negative electrode side case main body. The figure which shows the electrical wiring structure in the battery case shown in FIG. The figure which shows the modification of this invention. The perspective view which shows schematic structure of the battery case which concerns on another embodiment of this invention. The perspective view which shows schematic structure of the battery case which concerns on another embodiment of this invention.

Explanation of symbols

10 Positive side case body (case body)
11 circumference side part 12 slit 13 fitting hole (engagement part)
14 connection terminal 15 positive electrode 16 rib 20 negative electrode side case body (case body)
21 peripheral side portion 22 slit 23 engaging claw 24 tongue piece 25 connection terminal 26 printed circuit board 27 diode 28 polyswitch 29 negative electrode BAT battery (AA battery)

Claims (9)

Has a cylindrical battery and the like appearance dimensions of large diameter, a can accommodate a battery case arranged a small diameter cylindrical cell of a plurality of therein,
The case body,
A slit that is provided on the peripheral side portion of the case body and allows a part of the peripheral side surface of the cylindrical battery stored therein to be exposed and exposed,
Each connection terminal on the positive electrode side and the negative electrode side respectively connected to the positive electrode and the negative electrode of a plurality of cylindrical batteries provided inside both ends of the case body and housed therein,
A battery case comprising a positive electrode terminal and a negative electrode terminal which are provided outside both end portions of the case body and are connected to the connection terminals on the positive electrode side and the negative electrode side, respectively. The case body is composed of a case body that is provided so as to be detachable from each other,
2. Each case body is provided with an engaging portion that detachably connects the case bodies to each other in a valley formed between the peripheral side surfaces of a plurality of cylindrical batteries to be accommodated. Battery case as described in.   3. The battery case according to claim 2, wherein each of the case bodies includes a bottomed cylindrical positive case body and a negative case body that are divided in the axial direction.   The case main body has a main body portion and a hinge portion connected to the main body portion at one end and an engaging portion detachably connected to the main body portion at the other end, and the lid portion is connected to the main body portion. The battery case according to claim 1, wherein the battery case is provided so as to be freely opened and closed. The case body is battery case according to claim 1 single 1 size batteries and without the same like appearance dimensions, it is to rack mounted side four AA batteries as a cylindrical battery of the small diameter.   One of the connection terminals allows contact connection of one of the positive electrode and the negative electrode projecting at one end of the cylindrical battery, and the other flat electrode forming the other end of the cylindrical battery. The battery case according to claim 1, comprising a rib for preventing contact.   2. The battery case according to claim 1, wherein each of the cylindrical batteries is connected to a positive electrode or a negative electrode terminal via a reverse current blocking diode.   The battery case according to claim 7, wherein each of the diodes is mounted on a circuit board together with the positive or negative connection terminal and is incorporated into an end portion of the case body. Has a cylindrical battery and the like appearance dimensions of large diameter, a battery arranged a small diameter cylindrical cell of a plurality of therein,
A positive side case body and a negative side case body having a bottom portion divided in the axial direction;
Each connection terminal on the positive electrode side and the negative electrode side respectively connected to the positive electrode and the negative electrode of a plurality of cylindrical batteries provided inside both ends of each case body and housed therein,
A positive electrode terminal and a negative electrode terminal provided on both ends of each case body and connected to the positive electrode side and the negative electrode side connection terminals, respectively;
Each of the case bodies has a peripheral side portion that is disposed with an interval that allows a part of a peripheral side surface of a cylindrical battery accommodated therein to be inserted and exposed.

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