JP2009146692A - Cylindrical battery and battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical battery having a suitable liquid-pouring property, and a battery pack formed by using the cylindrical batteries. <P>SOLUTION: The cylindrical battery 100 includes an electrode 70 having a positive pole and a negative pole, and a cylindrical battery case 20 for housing the electrode 70 together with an electrolyte. A spiral recessed section 28 which is a non-contact recessed section brought into no contact with the side face 72 of the electrode 70 and is formed along the opposite face 27 is arranged on at least a part of a surface 27 facing to a side face 72 of the electrode housed in the case 20, which is an internal surface 26 of a cylinder section 22 forming the battery case 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylindrical battery and an assembled battery including the battery.

  Among various types of batteries, there is a battery provided with an electrode body (wound electrode body) having a spiral structure. By making the electrode body have a spiral structure, the reaction area of the positive and negative electrodes can be increased, thereby increasing the energy density and enabling high output. A battery equipped with such a wound electrode body is becoming increasingly important as a power source for mounting on a vehicle as a power source for obtaining a high output, or a power source for a personal computer and a portable seat terminal.

This type of wound electrode body is generally formed by winding a sheet-like positive electrode and a sheet-like negative electrode through a separator sheet, and the wound electrode body thus formed is a cylindrical type. Are sealed by attaching a lid to the opening of the battery container. And a cylindrical battery is constructed | assembled by inject | pouring electrolyte solution from the injection hole provided in the cover body. Examples of this type of cylindrical battery include Patent Documents 1 to 3.
Japanese Utility Model Publication No. 63-162459 JP 2001-266926 A JP 2000-331671 A

  In this type of cylindrical battery, the larger the proportion of the wound electrode body in the internal space of the battery container, the more electrode active material can be packed into the battery container, so that the capacity and efficiency of discharge are increased. Can be realized. That is, in order to efficiently increase the battery capacity, it is preferable to reduce an unnecessary space (a space not occupied by the wound electrode body) in the battery container. However, if the unnecessary space in the battery container is reduced, the gap between the battery container and the wound electrode body becomes very small (typically because the battery container and the wound electrode body are in close contact). The liquid injection property of the electrolytic solution may be impaired. For example, it takes a long time for the electrolyte injected from the liquid inlet of the lid to penetrate the entire wound electrode body, which may deteriorate the productivity of the battery.

  This invention is made | formed in view of this point, The main objective is to provide the cylindrical battery which has favorable liquid injectability.

  The cylindrical battery provided by the present invention includes an electrode body that includes a positive electrode and a negative electrode, and a cylindrical battery case that houses the electrode body together with an electrolytic solution. At least a part of the inner surface of the cylindrical portion constituting the battery case and facing the side surface of the electrode body housed in the case is a non-contact recess that does not contact the side surface of the electrode body. A spiral recess formed along the facing surface is provided.

  According to the configuration of the cylindrical battery of the present invention, the electrolyte injected into the battery case can be rapidly permeated into every corner of the electrode body through the gap (in the recess) of the spiral recess. The liquid injection property can be improved. Further, by utilizing the gap between the spiral recesses as the electrolyte channel, the ratio of the wound electrode body in the battery case can be increased without impairing the liquid injection property (for example, the battery case and the electrode body). And can be arranged so that they are in close contact with each other). Thereby, since many electrode active materials can be packed in a battery case, high capacity | capacitance and highly efficient discharge are attained.

  In a preferred aspect of the cylindrical battery disclosed herein, a spiral convex portion corresponding to the spiral concave portion is provided on the outer surface of the cylindrical portion. Thereby, the surface area of a battery case outer surface can be enlarged, and the cooling performance (heat dissipation) of a cylindrical battery can be improved.

  In a preferable aspect of the cylindrical battery disclosed herein, the cylindrical portion has a flat portion at a position where it can come into contact with the side surface of the electrode body on the inner surface of the cylindrical portion. According to such a configuration, the electrode body in the battery case can be held by a flat portion (a flat curved surface having no irregularities), so that interference between the spiral concave portion and the electrode body can be avoided, for example.

  In a preferred aspect of the cylindrical battery disclosed herein, the battery case is provided with a gas release mechanism (for example, a safety valve). And the said helical recessed part is comprised so that the gas generated in the said battery case can be guide | induced to the said gas discharge | release mechanism. According to this configuration, the gas generated when the battery malfunctions can be smoothly guided to the gas release mechanism through the gap between the spiral recesses. Therefore, according to the present invention, it is possible to provide a cylindrical battery having good degassing properties.

  In a preferable aspect of the cylindrical battery disclosed herein, at least a part of the battery case cylindrical portion including the spiral concave portion and the spiral convex portion is spirally continuous and in a longitudinal direction of the cylindrical portion. It constitutes a bent portion where corrugated irregularities are formed. Thus, by providing corrugated plate-like irregularities (bent portions) in the cylindrical portion, the cylindrical portion can be stretched. Therefore, the battery case can be expanded and contracted in the longitudinal direction with respect to the pressure from the outside. Thereby, for example, by appropriately expanding and contracting the bent portion, the dimensional variation in the longitudinal direction of the battery case (typically, the molding variation in manufacturing the battery case) can be corrected (absorbed).

  Further, according to the present invention, it is possible to provide an assembled battery formed by arranging a plurality of cylindrical batteries disclosed herein.

  As a battery pack according to a preferred embodiment, a battery pack is provided in which a plurality of cylindrical batteries having the spiral bent portion are arranged. In such a battery pack, the plurality of cylindrical batteries are arranged in a state in which the dimensions in the longitudinal direction are uniform by expanding and contracting the bent portion. By arranging the lengths of the cylindrical batteries in a uniform state, troubles caused by dimensional variations of the batteries (for example, a gap is created between the battery and the holding member, and the battery cannot be fixed firmly). Therefore, it is possible to construct a battery pack that is stable against vibrations and shocks.

  In a preferred aspect of the assembled battery disclosed herein, a holding member that holds the plurality of cylindrical batteries in a parallel posture is provided. The holding member has a holding portion (typically an insertion hole) in which a helical groove is formed to be screwed with the helical convex portion of the outer surface of the case when holding the battery. Yes. According to such a configuration, the cylindrical battery can be firmly held (preferably fixed) by the holding member by screwing the spiral convex portion and the spiral groove portion. In addition, it is only necessary to arrange the cylindrical battery while rotating it on the holding part (typically inserting it into the insertion hole while rotating it), and the cylindrical battery can be easily held (fixed) on the holding member. Assembling performance is improved. Furthermore, since it is not necessary to interpose a fixing member separately, the number of parts and the battery cost can be reduced.

  Embodiments according to the present invention will be described below with reference to the drawings. In the following drawings, members / parts having the same action are described with the same reference numerals. In addition, the dimensional relationships (length, width, thickness, etc.) in each drawing do not reflect actual dimensional relationships. Hereinafter, the structure of the cylindrical battery of the present invention will be described in detail by taking the cylindrical lithium ion secondary battery 100 as an example, but the present invention is intended to be limited to those described in the embodiment. It is not a thing.

  A configuration of a lithium ion secondary battery 100 (hereinafter also simply referred to as “battery”) of the present embodiment will be described with reference to FIG. FIG. 1 is an external perspective view schematically showing the external appearance of the battery 100. As an example, as shown in FIG. 1, a battery 100 disclosed herein includes an electrode body 70 (FIG. 2) that includes a positive electrode and a negative electrode, and a battery case 20 that houses the electrode body 70 and an appropriate electrolytic solution. .

  The battery case 20 that houses the electrode body 70 includes a cylindrical portion 22 that is a case body and a lid body 24. The cylindrical portion 22 has a shape that can accommodate the electrode body. In this embodiment, the cylindrical portion 22 has a bottomed cylindrical shape. The cylindrical portion 22 has an opening at the top, and is formed so that the electrode body 70 can be accommodated through the opening. The lid 24 is a disk-shaped member that closes the upper end opening of the cylindrical portion 22. The material of the battery case 20 (cylindrical portion 22 and lid 24) is preferably a lightweight metal material having good thermal conductivity, and examples of such a metal material include aluminum, stainless steel, nickel-plated steel ( In this embodiment, it is made of aluminum).

  A liquid injection port 40 is provided in the lid 24 of the battery case 20. The liquid injection port 40 is formed so that an electrolytic solution can be injected into the cylindrical portion 22, and is normally sealed by a liquid injection plug 42. Further, the lid 24 may be provided with a gas release mechanism 46 for releasing the gas generated in the case 20 to the outside as in the conventional battery case. In this embodiment, the gas release mechanism 46 is a safety valve. That is, in the safety valve 46, when the pressure in the battery case 20 rises abnormally, the valve body (not shown) is deformed for safety, and the gas inside the safety valve 46 is formed from the gap formed between the valve body and the lid body 24. Etc. are configured to be released.

  The lid 24 is provided with an electrode terminal (in this embodiment, a negative electrode terminal 60). In this embodiment, the negative electrode terminal 60 protrudes from the upper surface of the lid body 24 via the gasket 62 and is electrically connected to the negative electrode of the wound electrode body 70 accommodated in the cylindrical portion 22. The material constituting the negative electrode terminal 60 may be the same as that used in conventional batteries, for example, copper. The positive electrode of the wound electrode body 70 is connected to the bottom surface 22a of the cylindrical portion 22, and the cylindrical portion 22 constitutes a positive electrode terminal.

  Next, the internal configuration of the battery case 20 will be described with reference to FIG. FIG. 2 is a cross-sectional view schematically showing a cross-sectional configuration of the battery 100. As shown in FIG. 2, an electrode body 70 is accommodated in the battery case 20. In this embodiment, the electrode body 70 is composed of a predetermined battery constituent material (active material for each positive and negative electrode, current collector for each positive and negative electrode, separator, etc.), similarly to the electrode body included in a typical cylindrical battery. Has been. Here, a wound electrode body 70 having a spiral structure described later is used as the electrode body 70. As shown in the figure, the side surface of the electrode body 70 faces the inner surface 26 of the cylindrical portion 22 constituting the battery case 20 and is accommodated so as to be in contact therewith.

  On the inner surface 26 of the cylindrical portion 22, a facing surface 27 is formed that faces (can contact in this embodiment) a side surface 72 (that is, the outer surface of the wound body) 72 of the electrode body 70 accommodated in the case 20. Yes. That is, in this embodiment, there is almost no gap between the facing surface 27 and the side surface 72 of the electrode body.

  Further, a non-contact recess 28 that does not contact the electrode body side surface 72 is provided on at least a part of the facing surface 27 (in this embodiment, substantially the entire area of the facing surface 27). The non-contact recess 28 is a recess 28 formed in a spiral shape in the longitudinal direction on the facing surface 27 and has, for example, a female screw structure. In this embodiment, the spiral concave portion 28 corresponds to the female screw thread groove 28 and is continuously provided so that the pitch in the axial direction (longitudinal direction of the cylindrical portion 22) of the adjacent screw grooves 28 is constant. ing. A gap 25 is formed between the concave portion (screw groove) 28 and the electrode body side surface 72, and the gap 25 of the concave portion 28 spirally spirals in the longitudinal direction along the electrode body side surface 72. The upper end 74 to the lower end 76 are communicated with each other.

  In the cylindrical battery 100 having such a configuration, when an electrolytic solution is injected from the liquid injection port 40 of the lid 24, the injected electrolytic solution passes through the gap 25 of the spiral concave portion (here, screw groove) 28 and is an electrode body. It smoothly flows from the upper end 74 to the lower end 76 of the electrode body 70 while turning spirally along the side surface 72 to every corner inside the case 20. Therefore, the electrolytic solution can be supplied to the entire inside of the case 20, that is, the entire electrode body 70 in a short time without unevenness. That is, according to the configuration of the present embodiment, the electrolytic solution injected into the battery case 20 can be rapidly infiltrated into the electrode body 70 through the gap 25 of the spiral recess 28, and the electrolyte can be injected. Can be improved. Further, by utilizing the gap 25 of the spiral recess 28 as an electrolyte flow path, the ratio of the wound electrode body 70 in the battery case 20 can be increased without impairing the liquid injection property (for example, the battery The case 20 and the electrode body 70 can be disposed so as to be in close contact). Thereby, since more electrode active materials can be packed in the battery case 20, it becomes possible to realize high capacity and high efficiency discharge.

  The spiral recess 28 may be used as a gas escape passage. In this case, the spiral recess 28 is configured to be able to guide the gas generated in the battery case 20 to the gas release mechanism 46 (here, a safety valve). In this embodiment, the gap 25 of the spiral recess 28 is connected to the safety valve 46 via the gap 23 between the upper end 74 of the electrode body and the lid body 24. According to such a configuration, it is possible to smoothly guide the gas generated when the battery is abnormal to the safety valve 46 through the gap 25 of the spiral recess 28, and to provide the cylindrical battery 100 having a good gas venting property. it can.

  Each dimension of the spiral recess (here, thread groove) 28 is not particularly limited as long as it is a dimension that can ensure the flowability of the electrolyte and gas. The pitch (interval between adjacent recesses 28 in the axial direction) can be about 2 mm to 10 mm, and the depth of the recesses 28 can be about 0.5 mm to 5 mm. These can be suitably changed according to the configuration conditions of the cylindrical battery. Further, the spiral recess 28 may be provided on the entire facing surface 27. By forming the spiral concave portion 28 on the entire facing surface 27, the electrolyte injected into the battery case 20 is spread over the entire electrode body 70 (typically from one end in the axial direction (longitudinal direction) of the wound electrode body. Can penetrate in a short time)

  Furthermore, another characteristic part of the cylindrical battery 100 according to the present embodiment will be described with reference to FIG. As shown in FIG. 2, the outer surface 36 of the cylindrical portion 22 is provided with a spiral convex portion 38 formed corresponding to a spiral concave portion (thread groove) 28. The spiral convex portion 38 has, for example, a male screw structure provided on the outer surface 36 of the cylindrical portion 22, and corresponds to the male screw thread 38 in this embodiment. Thus, by providing the spiral convex portion 38 on the cylindrical portion outer surface 36, the surface area of the battery case 20 can be increased, and thereby the cooling performance (heat dissipation) of the cylindrical battery 100 can be improved. .

  Further, in the present embodiment, as shown in FIG. 2, the cylindrical portion of the battery case 20 including the spiral concave portion 28 and the convex portion 38 (that is, a screw structure portion in which a female screw and a male screw are integrated with each other). At least a part of 22 constitutes a bent portion 30 formed by processing the cylindrical portion 22 so that corrugated irregularities are formed in the longitudinal direction of the cylindrical portion 22 in a spiral shape. Thus, by providing a crease in the cylindrical portion 22, the cylindrical portion 22 can be stretched.

  Therefore, the battery case 20 can be deformed so as to be stretchable in the longitudinal direction with respect to pressure from the outside. Thereby, for example, the size variation in the longitudinal direction of the battery case 20 (typically, the molding variation in manufacturing the battery case 20) can be corrected (absorbed) by appropriately expanding and contracting the bent portion 30. In addition, the flexible bending part 30 can be easily produced, for example, by subjecting the cylindrical part 22 to appropriate plastic working (for example, press working).

  Thus, the assembled battery 200 according to the present embodiment can be constructed by arranging a plurality of cylindrical batteries 100 capable of correcting (absorbing) dimensional variations. FIG. 3 is an external perspective view schematically showing the external appearance of the assembled battery 200 according to the present embodiment. As shown in FIG. 3, the assembled battery 200 is configured by electrically connecting a plurality of cylindrical batteries 100 in series. The plurality of cylindrical batteries 100 are arranged in parallel in parallel postures. Each cylindrical battery 100 is arranged so as to be inverted one by one so that each positive electrode terminal (bottom surface 22a of the cylindrical portion 22) and negative electrode terminal 60 are alternately arranged. One positive terminal (bottom surface 22a of the cylindrical portion 22) and the other negative terminal 60 are electrically connected by a conductive connector (for example, a bus bar) (not shown). Thus, the assembled battery 200 having a desired voltage is constructed by electrically connecting the cylindrical batteries 100 in series via the conductive connectors.

  Around the cylindrical batteries 100 arranged in this way, a holding member 50 that holds the plurality of cylindrical batteries 100 together is provided. In this embodiment, the holding member 50 includes a pair of holding plates 52a and 52b disposed at both ends in the longitudinal direction of the cylindrical battery 100 and the holding plates 52a and 52b so as to bridge the pair of holding plates 52a and 52b. It is comprised from the bridge | crosslinking member 54 attached to 52b.

  FIG. 4 is a cross-sectional view of the main part showing the assembly structure of the cylindrical battery 100 to the holding member 50. In FIG. 4, some members (such as bus bars) are omitted. The pair of holding plates 52a and 52b has a plurality of holding portions, here, insertion holes 56a and 56b. The distal end portion of the cylindrical battery 100 is disposed (inserted) in the insertion holes 56a and 52b, and held (fixed) in that state. In this embodiment, an insertion hole 56a is formed in one holding plate 52a, and an insertion hole 56b is formed in the other holding plate 52b. In addition, a spiral groove 58 is formed in either one of the insertion hole 56a and the insertion hole 56b. The spiral groove 58 is screwed into a spiral protrusion (here, a thread) 38 formed on the outer surface 36 of the battery case 20. Has been. In this embodiment, the spiral groove 58 has a female screw structure formed in the insertion hole 56a on the holding plate 52a side.

  When the cylindrical battery 100 is assembled to the holding member 50, first, one end of the cylindrical battery 100 (the tip on the negative electrode terminal 60 side in the figure) is inserted while being rotated into the insertion hole 56a of the holding plate 52a. By inserting the cylindrical battery 100 while rotating, the spiral convex portion (male screw) 38 and the spiral groove portion (female screw) 58 are screwed together and tightened. The cylindrical battery 100 can be firmly fixed to the holding plate 52a by such fastening force.

  Next, the dimensions of each cylindrical battery 100 are adjusted by expanding and contracting the battery case 20 (bent portion 30) in the longitudinal direction, and the longitudinal dimensions (length dimensions) of the respective cylindrical batteries 100 are aligned. Each cylindrical battery 100 and the holding plates 52a and 52b are integrated with each other by inserting the other end of each cylindrical battery 100 (the tip on the positive terminal side in the figure) into the insertion hole 56b of the holding plate 52b. In this way, the cylindrical battery 100 can be assembled to the holding member 50.

  According to the configuration of the assembled battery 200 according to the present embodiment, the length of the cylindrical battery 100 varies by appropriately expanding and contracting the bent portion 30 (typically, the molding variation when manufacturing the battery case 20). Since it is assembled to the holding member 50 after correcting (absorbing), it is possible to arrange the cylindrical batteries 100 in a state in which the lengths of the cylindrical batteries 100 are aligned. For example, a gap is generated between the holding member and the battery cannot be firmly fixed). Therefore, it is possible to construct an assembled battery that is stable against vibration and impact. Further, the cylindrical battery 100 can be firmly fixed to the holding member 50 by screwing the spiral convex portion 38 and the spiral groove portion 58. In addition, it is only necessary to insert the cylindrical battery 100 while rotating it into the insertion hole 56a. The cylindrical battery 100 can be easily fixed to the holding member 50, and the assembling property is improved. Furthermore, since it is not necessary to interpose a fixing member separately, the number of parts and the battery cost can be reduced.

  As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible.

  For example, in the cylindrical battery 100 according to the above-described embodiment, the example in which the bent portion 30 is formed on substantially the entire cylindrical portion 22 has been shown. May be. An example is shown in FIG. In FIG. 5, the cylindrical portion 22 includes a bent portion 30 and a non-bent portion 29 that extends straight from the bent portion 30. A flat portion 29 a is formed on the inner surface of the non-bent portion 29 and constitutes a part of the facing surface 27. The flat portion 29a is a flat curved surface (that is, a curved surface that is the inner peripheral surface of the cylindrical portion) without unevenness, and is disposed at a position where it can contact the electrode body side surface 72 accommodated in the case. In this embodiment, the flat portion 29a is disposed slightly inward in the radial direction with respect to the portion 30a located at the innermost circumference of the bent portion 30, so that the bent portion 30 and the electrode body side surface 72 are not in direct contact with each other. It is configured. According to such a configuration, interference between the bent portion 30 and the electrode body side surface 72 can be avoided.

  In the above-described embodiment, the spiral recess 28 is formed along with the formation of the bent portion 30, but the present invention is not limited to this configuration, and the spiral recess 28 is formed on the inner surface side of the cylindrical portion 22 whose outer surface is flat. Also good.

  Hereinafter, each material etc. which comprise the cylindrical battery 100 and the assembled battery 200 which can be used by this embodiment are explained in full detail. The assembled battery 200 according to the present embodiment may be an assembled battery in which a cylindrical battery is a single battery and a plurality of such single batteries are arranged, and the type of the cylindrical battery is not particularly limited. The cylindrical battery is not limited to the above-described lithium ion battery, and a nickel hydride battery or the like can be cited as a configuration of a cylindrical battery suitable for the implementation of the present invention.

  As described above, the cylindrical battery 100 includes the electrode body 70 including the positive electrode and the negative electrode, and the battery case 20 that houses the electrode body 70 and the electrolyte. The configuration of the wound electrode body 70 housed in the battery case 20 will be described in detail. The wound electrode body according to the present embodiment includes a sheet-like positive electrode (hereinafter referred to as “positive electrode sheet”) and a sheet-like negative electrode (hereinafter referred to as “negative electrode sheet”), similarly to the wound electrode body of a normal lithium ion battery. This is a wound electrode body 70 which is laminated together with a total of two sheet-like separators (hereinafter referred to as “separator sheet”), and is further wound while slightly shifting the positive electrode sheet and the negative electrode sheet.

  As a result of the winding electrode body 70 being wound with a slight shift as described above in the lateral direction with respect to the winding direction, a part of the ends of the positive electrode sheet and the negative electrode sheet are respectively wound core portions (that is, the positive electrode sheet). The positive electrode active material layer forming part, the negative electrode active material layer forming part of the negative electrode sheet, and the separator sheet are closely wound around). A positive electrode lead terminal 66 and a negative electrode lead terminal 64 are attached to the protruding portion of the positive electrode side (that is, the portion where the positive electrode active material layer is not formed) and the protruding portion of the negative electrode side (that is, the portion where the negative electrode active material layer is not formed), respectively. These are electrically connected to the positive terminal (bottom surface 22a of the cylindrical portion 22) and the negative terminal 60, respectively.

  In addition, the material and member itself which comprise this winding electrode body may be the same as that of the electrode body of the conventional lithium ion battery, and there is no restriction | limiting in particular. For example, the positive electrode sheet can be formed by applying a positive electrode active material layer for a lithium ion battery on a long positive electrode current collector. For the positive electrode current collector, an aluminum foil (this embodiment) or other metal foil suitable for the positive electrode is preferably used. As the positive electrode active material, one or more of materials conventionally used in lithium ion batteries can be used without any particular limitation.

  On the other hand, the negative electrode sheet can be formed by applying a negative electrode active material layer for a lithium ion battery on a long negative electrode current collector. For the negative electrode current collector, a copper foil (this embodiment) or other metal foil suitable for the negative electrode is preferably used. As the negative electrode active material, one or more of materials conventionally used in lithium ion batteries can be used without any particular limitation.

  Moreover, what was comprised with porous polyolefin resin as a suitable separator sheet used between positive and negative electrode sheets is mentioned. When a solid electrolyte or a gel electrolyte is used as the electrolyte, there may be a case where a separator is unnecessary (that is, in this case, the electrolyte itself can function as a separator).

Next, the configuration of the electrolyte housed in the battery case 20 together with the wound electrode body will be described. The electrolyte is, for example, a lithium salt such as LiPF ₆ . An appropriate amount (for example, concentration 1M) of a lithium salt such as LiPF ₆ may be dissolved in a nonaqueous electrolytic solution such as a mixed solvent of diethyl carbonate and ethylene carbonate (for example, a mass ratio of 1: 1) and used as the electrolytic solution. it can.

  After the wound electrode body 70 is accommodated in the cylindrical portion 22 of the battery case 20, the lid body 24 is attached to the opening of the cylindrical portion 22 and sealed, and the electrolyte is injected from the injection port 40 and the injection is performed. The cylindrical battery 100 of this embodiment is constructed by sealing the liquid port 40. And the assembled battery 200 of this embodiment is constructed | assembled by arranging the cylindrical battery 100 in a predetermined direction (parallel in this embodiment), and fixing the said cylindrical battery 100 with the holding member 50. FIG.

  The assembled battery 200 according to the present embodiment and the assembled battery constructed using the cylindrical battery provided by the present invention can be suitably used as a power source for a motor (electric motor) mounted on a vehicle such as an automobile. . Therefore, in the present invention, as schematically shown in FIG. 6, a vehicle including such an assembled battery 200 as a power source (typically, an automobile provided with an electric motor such as a hybrid car, an electric car, and a fuel cell car). 1 can be provided.

It is an external appearance perspective view which shows typically the external appearance of the cylindrical battery which concerns on this embodiment. It is sectional drawing which shows typically the cross-sectional structure of the cylindrical battery which concerns on this embodiment. It is an external view which shows typically the external appearance of the assembled battery which concerns on this embodiment. It is principal part sectional drawing which shows the assembly | attachment structure to the holding member of a cylindrical battery. It is sectional drawing which shows the modification of the cylindrical battery which concerns on this embodiment. It is a side view which shows typically the vehicle (automobile) provided with the assembled battery of this embodiment.

Explanation of symbols

1 Vehicle (Automobile)
DESCRIPTION OF SYMBOLS 10 Cylindrical battery 20 Battery case 22 Cylindrical part 22a Bottom face 23 Gap 24 Lid 25 Gap 26 Inner face 27 Spiral recessed part 29 Non-bending part 29a Flat part 30 Bending part 36 Outer surface 38 Helical convex part 40 Injection port 42 Injection plug 46 Gas release mechanism (safety valve)
50 Holding members 52a and 52b Holding plate 54 Bridging members 56a and 56b Insertion hole (holding portion)
58 spiral groove 60 negative electrode terminal 62 gasket 64 negative electrode lead terminal 66 positive electrode lead terminal 70 electrode body 72 electrode body side surface 74 upper end 76 lower end 100 cylindrical battery 200 assembled battery

Claims (8)

An electrode body comprising a positive electrode and a negative electrode;
A cylindrical battery case that houses the electrode body together with an electrolyte solution,
At least a part of the inner surface of the cylindrical portion constituting the battery case and facing the side surface of the electrode body accommodated in the case is a non-contact recess that does not contact the side surface of the electrode body. A cylindrical battery provided with a spiral recess formed along the facing surface.   The cylindrical battery according to claim 1, wherein a spiral convex portion corresponding to the spiral concave portion is provided on an outer surface of the cylindrical portion.   The cylindrical battery according to claim 1, wherein the cylindrical battery has a flat portion at a position where it can come into contact with the side surface of the electrode body on the inner surface of the cylindrical portion. The battery case is provided with a gas release mechanism,
The cylindrical battery according to any one of claims 1 to 3, wherein the spiral recess is configured to guide gas generated in the battery case to the gas release mechanism.   At least a part of the cylindrical part of the battery case including the spiral concave part and the spiral convex part constitutes a bent part that is spirally continuous and has corrugated irregularities formed in the longitudinal direction of the cylindrical part. The cylindrical battery according to claim 2. An assembled battery comprising a plurality of the cylindrical batteries according to claim 5 arranged,
The plurality of cylindrical batteries are assembled batteries arranged in a state in which the dimensions in the longitudinal direction are aligned by expanding and contracting the bent portions. A holding member for holding the plurality of cylindrical batteries in a posture parallel to each other;
The assembled battery according to claim 6, wherein the holding member includes a holding portion in which a spiral groove portion is formed that is screwed into the spiral convex portion of the outer surface of the case when the battery is held.   A vehicle comprising the cylindrical battery according to claim 1 or the assembled battery according to claim 6 or 7.

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