Battery pack

Abstract

A cylindrical battery accommodated in a battery holder is effectively prevented from rotating due to vibration, impact and the like, and is held at a fixed position, thereby effectively preventing defects caused by rotation of the cylindrical battery. A battery pack is provided with: a cylindrical battery (1); and a battery holder (2) that arranges the cylindrical battery (1) at a fixed position. The battery holder (2) is provided with a holding cylinder section (20) that accommodates the cylindrical battery (1) therein, covers the outer peripheral surface (12) of the cylindrical battery (1), and opens in the holding cylinder section (20) to expose the outer peripheral surface (12) of the accommodated cylindrical battery (1) to the outside. The exposed portion of the cylindrical battery (1) exposed from the exposed window (8) is fixed to the battery holder (2) via an adhesive member (5).

Description

Technical Field

[0001] The present disclosure relates to a battery pack in which cylindrical batteries are housed in a battery holder. Background Art

[0002] As a battery pack having a secondary battery capable of charge and discharge, a battery pack having a plurality of cylindrical secondary batteries has been developed. The battery pack can connect a plurality of cylindrical batteries in series to increase the output voltage, and can also connect the plurality of cylindrical batteries in parallel to increase the charge and discharge current. In order to connect a plurality of cylindrical batteries in a given arrangement, the battery pack is accommodated in a battery holder. The battery holder is formed into a shape having a cylindrical battery accommodating portion for accommodating cylindrical batteries, and by accommodating cylindrical batteries in the battery accommodating portion, a plurality of cylindrical batteries are accommodated in a given arrangement. In addition, the plurality of cylindrical batteries accommodated in the battery holder expose the end surface electrodes at both ends from the electrode windows provided in the battery holder. The plurality of cylindrical batteries are connected in series or in parallel by connecting the end surface electrodes exposed from the battery holder through lead plates.

[0003] In this way, a battery pack containing cylindrical batteries in a battery holder is sometimes subjected to a load that causes the cylindrical batteries to rotate in the battery holder due to vibration, dropping, etc., depending on its use. In this case, the load is concentrated on the connection portion between the end face electrode and the lead plate of the cylindrical battery, and sometimes disadvantages such as poor connection may occur. For example, in a battery pack in which the lead plate is fixed to the end face electrode by welding, etc., sometimes the lead plate may be partially cut off near the connection portion between the end face electrode and the lead plate, resulting in poor connection. Such poor connection not only makes it impossible to use the battery pack normally, but also has the possibility of generating disadvantages such as heat, which cannot be said to be a preferred state.

[0004] In order to solve such a problem, a battery pack that prevents the cylindrical battery from rotating has been proposed. (See Patent Document 1)

[0005] Prior Art Literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2019-083087 Summary of the invention

[0008] -Problems to be solved by the invention-

[0009] The battery pack described in the bulletin includes cylindrical batteries that can be charged and discharged, and a battery holder that arranges the cylindrical batteries in a fixed position. The battery holder includes a peripheral wall covering the outer peripheral surface of the cylindrical battery and an end panel facing the end surface of the cylindrical battery. A battery receiving portion for receiving the cylindrical battery is provided by the peripheral wall and the end panel. Furthermore, the battery holder includes an inclined protrusion at the end of the battery receiving portion and at the boundary between the inner side surface of the end panel and the inner peripheral surface of the peripheral wall to partially press the end corner of the cylindrical battery received in the battery receiving portion. The inclined protrusion is a shape that gradually increases from the protrusion amount of the inner peripheral surface of the peripheral wall toward the end panel.

[0010] The above battery pack has the following advantages: when the cylindrical battery is accommodated in the battery accommodating portion of the battery holder, the end face corner of the cylindrical battery is partially pressed by the inclined protrusion provided at the boundary between the inner side surface of the end panel and the inner peripheral surface of the peripheral wall, thereby being able to hold the cylindrical battery in a fixed position in the battery accommodating portion, and effectively preventing the cylindrical battery from rotating. In addition, the battery pack has the following advantages: since the inclined protrusion is set to a shape that gradually increases from the protrusion amount of the inner peripheral surface of the peripheral wall toward the end panel, it is also possible to reliably prevent the cylindrical battery from moving in the axial direction.

[0011] However, as described above, the structure in which an inclined protrusion is provided on the inner side of the battery receiving portion and the inclined protrusion is made to press the end of the cylindrical battery for positioning has the problem that it is difficult to adjust the protrusion amount of the inclined protrusion. This is because there are manufacturing errors in the outer shape of the cylindrical battery and the inner shape of the battery receiving portion of the battery holder, so it is necessary to consider these errors to adjust the shape and protrusion amount of the inclined protrusion. When the protrusion amount of the inclined protrusion is too small, the cylindrical battery cannot be reliably maintained in a non-rotating state. On the contrary, when the protrusion amount of the inclined protrusion is too large, it is difficult to quickly insert the cylindrical battery into the fixed position of the battery receiving portion. In addition, the mold used to form the battery holder will also become complicated, and there is also a problem that the manufacturing cost becomes high. Furthermore, since the inclined protrusion formed by resin deteriorates over time, it is also difficult to stably keep the cylindrical battery from rotating for a long period of time.

[0012] The present invention is developed for the purpose of solving the above disadvantages. One of the purposes of the present invention is to provide a battery pack that can effectively prevent the cylindrical batteries contained in the battery holder from rotating due to vibration, impact, etc. while holding them in a fixed position, and effectively prevent the disadvantages caused by the rotation of the cylindrical batteries.

[0013] -Methods for solving the problem-

[0014] A battery pack according to a certain aspect of the present invention comprises: a cylindrical battery; and a battery holder for placing the cylindrical battery in a fixed position. The battery holder comprises: a holding cylinder for accommodating the cylindrical battery inside and covering the outer peripheral surface of the cylindrical battery, an exposure window for opening the holding cylinder to expose the outer peripheral surface of the accommodated cylindrical battery to the outside, and an exposed portion of the cylindrical battery exposed from the exposure window is fixed to the battery holder via an adhesive member.

[0015] -Effects of the Invention-

[0016] According to the battery pack of the present invention, there is an advantage that the cylindrical batteries accommodated in the battery holder can be effectively prevented from rotating due to vibration, impact, etc., thereby effectively preventing the disadvantages caused by the rotation of the cylindrical batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a perspective view showing the appearance of a battery pack according to an embodiment of the present invention.

[0018] Figure 2 It is shown Figure 1 A three-dimensional diagram of the manufacturing process of a battery pack.

[0019] Figure 3 yes Figure 2 An exploded perspective view of a battery assembly of a battery pack.

[0020] Figure 4 Yes Figure 3 An exploded perspective view of a battery holder of a battery assembly being exploded.

[0021] Figure 5 yes Figure 2 A side view of the battery assembly is shown.

[0022] Figure 6 yes Figure 2 A cross-sectional view of the battery assembly taken along line VI-VI is shown.

[0023] Figure 7 yes Figure 2 A cross-sectional view of the battery assembly taken along line VII-VII is shown.

[0024] Figure 8 It is an enlarged sectional stereoscopic view of a retaining cylinder provided with an exposure window.

[0025] Fig. 9 yes Figure 6 An enlarged cross-sectional view of the exposure window is shown.

[0026] Fig.10 yes Figure 4 An enlarged front view of the exposure window is shown.

[0027] Fig.11 This is an enlarged cross-sectional view showing another example of disposing an adhesive tape on the exposure window.

[0028] Fig.12 This is an enlarged cross-sectional view showing an example of disposing an adhesive in the exposure window. DETAILED DESCRIPTION

[0029] A battery pack according to one embodiment of the present invention is a battery pack comprising cylindrical batteries and a battery holder for placing the cylindrical batteries in a fixed position, the battery holder comprising: a retaining cylinder for accommodating the cylindrical batteries on the inside and covering the outer peripheral surface of the cylindrical batteries, an exposure window through which the retaining cylinder is opened to expose the outer peripheral surface of the accommodated cylindrical batteries to the outside, and the exposed portion of the cylindrical batteries exposed from the exposure window is fixed to the battery holder via an adhesive member.

[0030] According to the above battery pack, since the outer peripheral surface of the cylindrical battery contained in the holding cylinder of the battery holder is exposed to the outside through the exposure window provided in the holding cylinder, and the exposed portion is fixed to the battery holder via the adhesive member, it is possible to fully ensure the clearance between the holding cylinder and the cylindrical battery, making the manufacturing and assembly simple, and at the same time, the cylindrical battery is reliably fixed to the battery holder, and the disadvantage of the cylindrical battery rotating inside the holding cylinder is reliably prevented. The battery pack that prevents the rotation of the cylindrical battery in this way has the advantage of being able to effectively prevent the disadvantages such as poor contact caused by the rotation of the cylindrical battery.

[0031] In a battery pack involved in another embodiment of the present invention, the battery pack includes a plurality of cylindrical batteries, and the battery holder includes: a plurality of retaining cylinders for accommodating the plurality of cylindrical batteries in a mutually parallel posture, the plurality of retaining cylinders include: a dividing wall portion arranged between mutually adjacent cylindrical batteries; and a peripheral wall portion forming an outer side surface of the battery holder, and an exposure window is provided in the opening of the peripheral wall portion.

[0032] According to the battery pack described above, cylindrical batteries can be housed in a plurality of holding tubes while the outer peripheral surface of each cylindrical battery is exposed from an exposure window provided in a peripheral wall portion forming the outer side surface of the battery holder, and all cylindrical batteries can be fixed to the battery holder via an adhesive member.

[0033] In a battery pack involved in another embodiment of the present invention, the battery pack further includes: a lead plate for electrically connecting a plurality of cylindrical batteries arranged at a fixed position through a battery holder, the cylindrical batteries have end surface electrodes at both ends, the battery holder has an end panel portion opposite to the end surface electrodes of the cylindrical batteries, and an electrode window for exposing the end surface electrodes is provided on the end panel portion, the end surface electrodes exposed from the electrode window are connected to the lead plate, and the plurality of cylindrical batteries are connected in series and / or in parallel.

[0034] According to the above battery pack, it is possible to form a structure in which the end face electrodes of multiple cylindrical batteries held in a fixed position by a battery holder are connected by a lead plate, and at the same time, by preventing the cylindrical batteries in the battery holder from rotating, damage to the connection part between the end face electrodes and the lead plate is prevented, thereby maintaining a stable power-on state.

[0035] In a battery pack according to another aspect of the present invention, the battery holder includes an exposure window located at an end portion of the holding tube portion.

[0036] According to the above battery pack, since the end of the holding cylinder of the battery holder is provided with an exposure window, the end of the cylindrical battery can be fixed to the battery holder. Therefore, the portion of the end surface electrode close to the lead plate can be reliably fixed to the battery holder, effectively preventing poor connection between the end surface electrode and the lead plate.

[0037] In a battery pack according to another aspect of the present invention, the adhesive member is an adhesive tape, and an adhesive surface of the adhesive tape is bonded to the exposed portion of the cylindrical battery exposed from the exposure window and to the opening edge of the exposure window.

[0038] According to the above battery pack, the exposed portion of the cylindrical battery can be fixed to the battery holder simply and easily in a short time using the adhesive tape.

[0039] In a battery pack involved in another embodiment of the present invention, the exposure window is a main rectangular shape, which is formed by a pair of first opening edges cut along the busbar direction of the retaining cylinder and a pair of second opening edges cut along a direction intersecting the first opening edges, and the opening edge portion to which the adhesive tape is bonded is set as the cut surface of the retaining cylinder cut along the pair of first opening edges.

[0040] According to the above battery pack, since the exposure window opened in the retaining cylinder is set to be a main-view rectangular shape composed of a pair of first opening edges and a pair of second opening edges, and the opening edge portion bonded with the adhesive tape is set to be a cut surface of the retaining cylinder portion cut along the first opening edge extending in the busbar direction, it has the following advantages: by fixing the exposed portion exposed from the exposure window relative to the opening edge portion of the first opening edge set in the rotation direction of the cylindrical battery with the adhesive tape, the rotation of the cylindrical battery can be more effectively prevented.

[0041] In a battery pack according to another aspect of the present invention, in a transverse cross-sectional view of the holding cylinder, the cut surfaces formed on both sides of the exposure window are flat surfaces extending in a tangential direction of the center of the outer peripheral surface of the cylindrical battery exposed from the exposure window.

[0042] According to the battery pack described above, since the cut surfaces formed on both sides of the exposure window are formed into a plane shape extending in the tangential direction of the central portion of the outer peripheral surface of the cylindrical battery exposed from the exposure window, the middle portion of the adhesive tape bonded across the cut surfaces can be bonded to the outer peripheral surface of the cylindrical battery between the cut surfaces, and the cylindrical battery can be reliably fixed to the battery holder. In particular, since the cut surfaces formed on both sides of the exposure window can be formed into a plane shape extending in the tangential direction of the outer peripheral surface, the adhesive tape can be attached to a fixed position in a state where it is stretched, so that the positioning of the adhesive tape can be simplified, and the cylindrical battery can be simply and easily fixed.

[0043] In a battery pack according to another aspect of the present invention, the cut surface is an inclined surface or a curved surface inclined relative to a plane including the central axis of the cylindrical battery and the first opening edge, and forms an obtuse angle with the outer peripheral surface of the cylindrical battery exposed from the exposure window.

[0044] According to the above battery pack, since the cut surface to which the adhesive tape is adhered is set as an inclined surface or a curved surface inclined relative to the plane containing the central axis of the cylindrical battery and the first opening edge, the angle formed by the cut surface and the outer peripheral surface of the cylindrical battery exposed from the exposure window is an obtuse angle, the cut surface of the retaining cylinder can be made wider, the adhesive tape can be reliably adhered to the opening edge of the exposure window, and the cylindrical battery can be fixed to the battery holder with a stronger adhesive force.

[0045] In a battery pack according to another aspect of the present invention, a battery holder has a plurality of exposure windows opened in a holding tube arranged on a front view straight line, and an adhesive member is an adhesive tape which is attached across the plurality of exposure windows to fix the plurality of cylindrical batteries to the battery holder.

[0046] According to the battery pack described above, a plurality of cylindrical batteries can be simultaneously fixed to the battery holder by attaching one adhesive tape across the plurality of exposure windows. Therefore, the plurality of cylindrical batteries can be efficiently fixed to the battery holder, and the manufacturing time can be shortened.

[0047] In the battery pack according to another aspect of the present invention, the bonding member is an adhesive.

[0048] According to the battery pack described above, the cylindrical battery can be fixed to the battery holder simply and easily while supplying the adhesive to the outer peripheral surface exposed from the exposure window provided in the holding cylinder and supplying the adhesive to the correct position.

[0049] In a battery pack involved in another embodiment of the present invention, the exposed window is rectangular in main view, and the main view rectangular shape is formed by a pair of first opening edges cut along the busbar direction of the retaining cylinder and a pair of second opening edges cut along a direction intersecting the first opening edges, and the adhesive is applied to at least the boundary portion between the pair of first opening edges and the outer peripheral surface of the cylindrical battery.

[0050] According to the above battery pack, since the exposure window of the retaining cylinder opening is set to be a main view rectangular shape composed of a pair of first opening edges and a pair of second opening edges, and the adhesive is applied at least to the boundary portion between the pair of first opening edges and the outer peripheral surface of the cylindrical battery, it has the following advantages: the first opening edge set in the rotation direction of the cylindrical battery can be fixed to the outer peripheral surface of the cylindrical battery, thereby more effectively preventing the rotation of the cylindrical battery.

[0051] Hereinafter, the embodiments of the present invention will be described based on the accompanying drawings. However, the embodiments shown below are examples for concretizing the technical ideas of the present invention, and the present invention is not limited to the following methods. In addition, this specification does not identify the components shown in the claims as components of the embodiments. In particular, the size, material, shape, relative configuration, etc. of the structural components described in the embodiments are not intended to limit the scope of the present invention to this, as long as there is no particularly specific description, but are just simple illustrative examples. In addition, the size, positional relationship, etc. of the components shown in the drawings are sometimes exaggerated for the purpose of clarifying the description. Further, in the following description, the same name and figure mark represent the same or homogeneous components, and detailed description is appropriately omitted. Further, the various elements constituting the present invention can be set as a plurality of elements constituted by the same component to achieve a method in which one component concurrently uses a plurality of elements, and conversely, it can also be achieved by multiple components sharing the function of one component.

[0052] The battery pack of the present invention can be used as a power source for electrical equipment such as speakers, electric cleaners, and electric tools, or as a backup power source for servers in stationary power storage applications, a power supply device for home use, office use, and factory use, and further as a driving power source for power-assisted bicycles, electric scooters, electric carts, or hybrid vehicles, electric vehicles, and other vehicles. Hereinafter, as one embodiment of the present invention, a battery pack used as a power source for a wireless speaker will be described.

[0053] [Implementation Method 1]

[0054] The battery pack 100 according to the first embodiment of the present invention is shown in FIG. Figures 1 to 10 . Figure 1 A three-dimensional diagram showing the appearance of a battery pack. Figure 2 Indicates Figure 1 A three-dimensional diagram of the manufacturing process of a battery pack, Figure 3 Indicates that Figure 2 An exploded perspective view of a battery assembly with the lead plate removed. Figure 4 Express Figure 3 An exploded perspective view of a battery holder of a battery assembly being decomposed, Figure 5 express Figure 2 A side view of the battery assembly shown, Figure 6 express Figure 2 A cross-sectional view of the battery assembly along line VI-VI shown in FIG. Figure 7 express Figure 2 A cross-sectional view of the battery assembly taken along line VII-VII is shown.

[0055] The battery pack 100 shown in these figures includes: a cylindrical battery 1; and a battery holder 2 for arranging the cylindrical battery 1 at a fixed position. The battery holder 2 includes: a holding cylinder 20 for accommodating the cylindrical battery 1 inside, and an exposure window 8 for covering the outer peripheral surface 12 of the cylindrical battery 1, the holding cylinder 20 is opened to expose the outer peripheral surface 12 of the accommodated cylindrical battery 1 to the outside, and the exposed portion of the cylindrical battery 1 exposed from the exposure window 8 is fixed to the battery holder 2 via an adhesive member 5. Hereinafter, as a battery pack according to Embodiment 1 of the present invention, a battery pack 100 including a plurality of cylindrical batteries 1 will be described. The battery pack 100 shown in the figures includes a plurality of cylindrical batteries 1, and the battery holder 2 includes: a plurality of holding cylinders 20 for accommodating the plurality of cylindrical batteries 1 in a mutually parallel posture. Furthermore, the battery pack 100 shown in the figures includes: a lead plate 3 for electrically connecting the plurality of cylindrical batteries 1 arranged at a fixed position through the battery holder 3.

[0056] (Battery assembly 10)

[0057] Figures 1 to 7 The battery pack 100 shown accommodates a plurality of cylindrical batteries 1 in a plurality of retaining cylinders 20 of a battery holder 2 and is arranged in a fixed position, and a lead plate 3 is fixed to both end surfaces of the battery holder 2. Furthermore, a circuit substrate 4 is arranged on the upper portion of the battery holder 2 to make a battery assembly 10, the upper surface of the battery assembly 10 is covered with an insulating member 6, and the surface is covered with an outer sheet 8.

[0058] (Cylindrical battery 1)

[0059] Each cylindrical battery 1 is a cylindrical battery cell whose outer can is set to a cylindrical shape. As an example, the cylindrical battery 1 can use the following cylindrical battery: the electrode body is contained in a metal and cylindrical outer can, the electrolyte is filled, and the opening of the outer can is sealed airtightly by a sealing plate. The cylindrical battery 1 is provided with end surface electrodes 11 at both ends in the long side direction. The cylindrical battery 1 sets the electrodes provided in the bottom surface of the outer can as the two end surfaces and the central part of the sealing plate as positive and negative electrodes. The cylindrical battery 1 shown in the figure is formed by a convex electrode arranged in the central part of the sealing plate to form a first electrode 11A, and the other end surface electrode 11 is formed by the bottom surface electrode of the outer can as a second electrode 11B.

[0060] For such a cylindrical battery 1, a non-aqueous electrolyte secondary battery with high energy efficiency, such as a lithium ion secondary battery, can be suitably used. However, the battery pack of the present invention does not define the cylindrical battery as a lithium ion secondary battery. For the cylindrical battery, all rechargeable batteries, such as nickel-hydrogen batteries, nickel-cadmium batteries, etc., can also be used.

[0061] (Battery holder 2)

[0062] The battery holder 2 holds a plurality of cylindrical batteries 1 in a fixed position. The battery holder 2 includes: a holding cylinder 20, which accommodates the cylindrical batteries 1 inside and covers the outer peripheral surface 12 of the cylindrical batteries 1. The illustrated battery holder 2 includes: a plurality of holding cylinders 20, which accommodate a plurality of cylindrical batteries 1 in a mutually parallel posture. The illustrated battery holder 2 holds a plurality of cylindrical batteries 1 in a posture in which the cylindrical batteries 1 are parallel to each other in the long side direction and the end surface electrodes 11 at both ends are arranged on the same plane. The battery holder 2 is formed by resin into a shape connecting the plurality of holding cylinders 20. The battery holder 2 preferably contains a material with excellent insulation and heat resistance, such as a resin such as polycarbonate or ABS.

[0063] The battery holder 2 shown in the figure has a box-like outer shape, and a plurality of cylindrical batteries 1 are arranged in multiple layers and multiple rows. The battery holder 2 that accommodates the plurality of cylindrical batteries 1 in multiple layers and multiple rows is formed into a shape in which a plurality of holding cylinders 20 are connected in multiple layers and multiple rows. The plurality of holding cylinders 20 include: a partition wall portion 23 arranged between the cylindrical batteries 1 accommodated adjacent to each other; and a peripheral wall portion 22 forming the outer side surface of the battery holder 2. The battery pack 100 of the present invention is characterized in that each holding cylinder 20 constituting the battery holder 2 includes: an exposure window 8 that exposes a portion of the outer peripheral surface 12 of the accommodated cylindrical battery 1 to the outside, and the cylindrical battery 1 accommodated in the holding cylinder 20 is prevented from rotating in the battery holder 2 by fixing the exposed portion exposed to the outside from the exposure window 8 to the battery holder 2 via an adhesive member 5. Therefore, each holding cylinder 20 constituting the battery holder 2 opens to partially expose the exposure window 8 of the cylindrical battery 1. As shown in the figure, the battery holder 2 that accommodates a plurality of cylindrical batteries 1 in multiple layers and rows is provided with partition walls 23 between adjacent cylindrical batteries 1, and a peripheral wall 22 is provided in the area forming the outer side surface of the battery holder 2. Therefore, the battery holder 2 is provided with an exposure window 8 at the opening of the peripheral wall 22 of each holding cylinder 20. Figure 3 As shown, the battery holder 2 has a box-shaped outer shape, and the end surface electrodes 11 of the cylindrical batteries 1 are arranged on the first surface 2A and the third surface 2C of the battery holder 2. The second surface 2B and the fourth surface 2D are opened with exposure windows 8 for partially exposing the cylindrical batteries 1.

[0064] Figure 4 as well as Figure 6 The battery holder 2 is a shape in which eight holding cylinders 20 are connected in a parallel posture into four layers and two rows, so that the inner side of the holding cylinder 20 is almost equal to the outer shape of the cylindrical battery 1, to serve as a battery accommodating portion 21. The illustrated battery holder 2 arranges eight cylindrical batteries 1 into four layers and two rows, and maintains a posture arranged up and down and left and right in the figure. The illustrated battery holder 2 arranges eight cylindrical batteries 1 into a matrix shape, so that they are symmetrical in a front view. This structure has the advantage of being able to stably maintain the battery holder 2 in which the cylindrical batteries 1 are arranged in multiple layers in an upright posture. The number and arrangement of the cylindrical batteries 1 are not limited to this structure, and it can also be a structure with less than 7 or more than 9 cylindrical batteries 1. In addition, in addition to being arranged in a matrix shape, it can also be arranged in a staggered shape so that each layer alternates. The battery pack 100 shown in the figure has eight cylindrical batteries 1 arranged in two rows in the horizontal direction and stacked in four layers in the vertical direction, but the battery pack is not limited to the arrangement of the plurality of cylindrical batteries or the installation posture of the battery pack.

[0065] However, in the battery pack 100 of the present invention, since a part of the outer peripheral surface 12 of all the cylindrical batteries 1 accommodated in the battery holder 2 is exposed to the outside, when the cylindrical batteries 1 are stacked in three or more layers in the vertical direction, the horizontal direction is set to less than two rows, and when the cylindrical batteries 1 are arranged in three or more rows in the horizontal direction, the vertical direction is set to less than two layers. That is, by setting the number of cylindrical batteries 1 arranged in the left-right direction or the vertical direction to less than two, the peripheral wall portion 22 can be provided on all the holding cylinder portions 20, and the window 8 can be opened in the peripheral wall portion 22 to expose the window 8. Figure 3 The battery pack 100 shown is in the following posture: the first surface 2A and the third surface 2C of the battery holder 2 provided with the lead plate 3 are arranged in the front-to-back direction, and the second surface 2B and the fourth surface 2D provided with the exposure window 8 are arranged in the left-right direction. However, the battery pack can also be arranged in the up-down direction as the upper and lower surfaces of the first surface 2A and the third surface 2C of the battery holder 2 provided with the lead plate 3, and the second surface 2B and the fourth surface 2D of the battery holder 2 provided with the exposure window 8 can also be arranged in the up-down direction as the upper and lower surfaces. In addition, the battery holder shown in the figure is provided with the exposure window 8 on the second surface 2B and the fourth surface 2D of the battery holder 2 in which the cylindrical batteries 1 are arranged in multiple layers, but the exposure window can also be provided on the fifth surface and the sixth surface.

[0066] Figure 4 The battery holder 2 is divided into a first holder 2X and a second holder 2Y in the longitudinal direction of the cylindrical battery 1. The illustrated battery holder 2 connects the first holder 2X and the second holder 2Y, which are formed integrally with the end plate portion 26 and one end of the divided retaining cylinder 20, to each other at the opening, and is provided with a battery receiving portion 21 for receiving the cylindrical battery 1 inside. The battery holder 2 can smoothly insert the elongated cylindrical battery 1. The first holder 2X and the second holder 2Y are independently made by resin molding, and are connected to each other by inserting the cylindrical battery 1. The first holder 2X and the second holder 2Y are provided with a cylindrical battery receiving portion 21 in order to insert and arrange the cylindrical battery 1 in a fixed position. The inner shape of the battery receiving portion 21 is almost equal to the outer shape of the cylindrical battery 1, or more precisely, slightly larger, so that the cylindrical battery 1 can be smoothly inserted and arranged in a fixed position. The first holder 2X and the second holder 2Y of this structure are connected to each other at a fixed position via the cylindrical battery 1 in a state where they are inserted into both ends of the cylindrical battery 1. Furthermore, the first holder 2X and the second holder 2Y are connected by a locking structure. Figure 4 The second holder 2Y is provided with a locking hook 27 extending in the axial direction integrally formed on the outer side of the holding cylinder 33, and the first holder 2X is provided with a locking portion 28 guiding the locking hook 27 at an opposite position. The first holder 2X and the second holder 2Y connect the locking hook 27 and the locking portion 28 so that they will not be separated from each other.

[0067] The battery holder 2 described above is a structure that is divided into a first holder 2X and a second holder 2Y in the middle of the holding cylinder. Although not shown in the figure, the battery holder can also be composed of two components, including: a main body, which is obtained by integrally forming an end panel with one end of the holding cylinder that accommodates almost the entire cylindrical battery; and a cover body, which has an end panel portion with an opening arranged at the other end of the holding cylinder. Alternatively, the battery holder can also be composed of three components, including: a main body, which includes a holding cylinder with openings at both ends that accommodates almost the entire cylindrical battery; and a pair of covers, which have end panel portions arranged at the openings at both ends of the main body.

[0068] Figure 4 and Figure 6 The battery assembly 10 shown has a non-melting plate 13 disposed inside a partition wall 23 disposed between adjacent cylindrical batteries 1. The non-melting plate 13 is a plate that does not deform due to the temperature of the abnormally heated cylindrical battery 1, and preferably an inorganic plate such as a mica plate is used. The battery holder 2 shown in the figure arranges the cylindrical batteries 1 in 4 layers and 2 rows, so a cross-shaped partition wall 23 is disposed vertically between the 8 cylindrical batteries 1 disposed vertically and horizontally. The partition wall 23 is provided with an insertion gap 14 into which the non-melting plate 13 is inserted. The battery block 10 can prevent thermal runaway from being induced in an adjacent cylindrical battery 1 when any cylindrical battery 1 is abnormally heated due to thermal runaway.

[0069] Furthermore, the battery holder 2 has an opening provided with a connection window 24 for exposing the end surface electrode 11 to connect the lead plate 3 at the end plate portion 26 facing the end surface electrode 11 of the cylindrical battery 1. The connection window 24 for guiding the first electrode 11A as the protruding electrode is larger than the outer shape of the protruding electrode and is sized to allow the protruding electrode to be inserted inside. The connection window 24 allows the protruding electrode to be arranged inside to be welded to the lead plate 3, thereby reducing the height difference with the first electrode 11A exposed from the connection window 24 and welding the lead plate 3 to the first electrode 11A. The connection window 24 arranged at a position facing the second electrode 11B as the bottom surface of the outer can is opened to a size that allows the welding portion 33 of the lead plate 3 to be guided to the second electrode 11B.

[0070] Furthermore, the battery holder 2 is provided with a receiving area 25 for receiving the circuit substrate 4 at an upper portion. Figure 3 The battery holder 2 shown has peripheral walls on the front, rear, left and right sides protruding from the upper surface, and recessed portions are provided inside the peripheral walls on four sides to serve as a storage area 25 for the circuit board 4 . Figure 6 The circuit board 4 is arranged in a gap between the battery holder 2 and the bottom surface of the storage area 25 . Figure 3The circuit substrate 4 is arranged at a fixed position by setting the outer periphery to fit the inner periphery of the storage area 25. However, the battery holder may be directly fixed to the circuit substrate installation area by screw fastening, or a substrate holder for holding the circuit substrate may be separately provided.

[0071] (Exposure window 8)

[0072] like Figures 3 to 10 As shown, the exposure window 8 is provided in the peripheral wall portion 22 of the holding cylinder 20 , and exposes a portion of the outer peripheral surface 12 of the cylindrical battery 1 accommodated in the battery accommodation portion 21 . Fig.10 The exposure window 8 shown is a front view rectangular shape formed by a pair of first opening edges 8A cut along the generatrix direction of the retaining cylinder 20, and a pair of second opening edges 8B cut along a direction intersecting the first opening edges 8A. Figure 8 to Figure 10 The exposure window 8 shown in the figure is provided with a cut surface 29 of the retaining tube portion 20 cut along a pair of first opening edges 8A at the opening edge portion. Fig. 9 The battery holder 2 shown is formed by cutting the holding cylinder 20 in a direction inclined with respect to the radial direction of the cylindrical battery 1 to provide a cut surface 29 so that the area of ​​the cut surface 29 becomes larger. Fig. 9 The battery holder 2 shown has a pair of cut surfaces 29 formed on both sides of the exposure window 8 in a cross-sectional view of the holding tube 20 , which are flat surfaces extending in a tangential direction of the center of the outer peripheral surface 12 of the cylindrical battery 1 exposed from the exposure window 8 .

[0073] As described above, the cut surface 29 formed on both sides of the exposure window 8 will be described in detail later, but it is suitable for bonding the adhesive tape 5A used as the adhesive member 5. In particular, it is suitable to bond the adhesive tape 5A to the cut surface 29 formed along the first opening edge 8A extending in the generatrix direction of the holding cylinder 20 as the opening edge of the exposure window 8, so as to fix the exposed part of the cylindrical battery 1 to the battery holder 2. This is because, as Fig. 9 As shown by the arrow A, the adhesive tape 5A can be adhered to the cut surfaces 29 provided on both sides of the exposure window 8 in the direction in which the cylindrical battery 1 is to be rotated inside the holding cylinder 20, so that the cylindrical battery 1 can be fixed to the battery holder 2. In this structure, when the adhesive tape 5A is adhered, the adhesive tape 5A is adhered across the cut surfaces 29 on both sides, thereby making it possible to adhere both sides of the adhesive tape 5A adhered to the outer peripheral surface 12 of the cylindrical battery 1 to the cut surfaces 29, and the cylindrical battery 1 can be reliably fixed to the battery holder 2. In particular, since the adhesive tape 5A can be adhered to the fixed position of the exposure window 8 in a state of being stretched, the cylindrical battery 1 can be simply and easily fixed while the positioning of the adhesive tape 5A is simple.

[0074] As described above, the structure in which a pair of cut surfaces 29 extending in the tangential direction of the outer peripheral surface 12 are provided on both sides of the exposure window 8 has the following advantages: the interval between the pair of first opening edges 8A, i.e., the opening width (H) can be narrowed, and the exposed portion of the cylindrical battery 1 can be reliably fixed to the battery holder 2 via the adhesive tape 5A. Fig.11 As shown, the exposure window 8 may be configured such that the distance between the pair of first opening edges 8A, ie, the opening width (H), is increased so that the exposed portion of the cylindrical battery 1 protrudes outward. Fig.11 The battery holder 2 shown is configured such that the cut surface 29 provided on both sides of the exposure window 8 is an inclined surface inclined relative to the plane P including the central axis O of the cylindrical battery 1 and the first opening edge 8A, and the angle α formed by the inclined surface and the outer peripheral surface 12 of the cylindrical battery 1 exposed from the exposure window 8 is an obtuse angle. The battery holder 2 of this structure has the advantage of being able to widen the exposed portion of the cylindrical battery 1 exposed from the exposure window 8 so as to adhere the adhesive tape 5A with a wider area. The above battery holder 2 sets the cut surface 29 of the holding cylinder 8 as a plane, but the cut surface can also be set as a curved surface. In this way, the structure of setting the cut surface 29 of the holding cylinder 20 as an inclined surface or a curved surface has the advantage of being able to widen the area so as to reliably adhere the adhesive tape 5A with a wider area.

[0075] like Fig.10 As shown, the exposure window 8 in a rectangular shape in a main view can be variously changed in the opening width (H) between the first opening edges 8A and the opening length (L) between the second opening edges 8B according to the width and adhesive strength of the adhesive tape 5A used. The opening width (H) between the first opening edges 8A is, for example, 0.3 to 1.0 times the radius (r) of the cylindrical battery 1 to be accommodated, and the opening length (L) between the second opening edges 8B is, for example, 1 to 1.5 times the horizontal width (W) of the adhesive tape 5A, and can be set to 8 mm to 20 mm.

[0076] Figure 3 to Figure 5 The battery holder 2 shown is provided with an exposure window 8 at the end of the holding cylinder 20, which is located opposite to both ends in the longitudinal direction of the cylindrical battery 1. This structure has the following advantages: the end surface electrode 11 of the end of the cylindrical battery close to the lead plate 3 can be reliably fixed to the battery holder 2, and the poor connection between the end surface electrode 11 and the lead plate 3 can be effectively prevented. However, the exposure window can also be provided in the middle part of the holding cylinder, facing the central part of the cylindrical battery.

[0077] Further, Figure 3 to Figure 5The battery holder 2 shown has a plurality of exposure windows 8 opened in the holding cylinder 20 arranged on a straight line in the front view, and a plurality of cylindrical batteries 1 are fixed to the battery holder 2 via a single adhesive tape 5A affixed across the plurality of exposure windows 8. According to this structure, by attaching a single adhesive tape 5A across the plurality of exposure windows 8, a plurality of cylindrical batteries 1 can be efficiently fixed to the battery holder 2, and the manufacturing time can be shortened. However, a single adhesive tape 5A may be attached to a single exposure window 8 to fix a single cylindrical battery 1.

[0078] Further, Figure 3 to Figure 5 The battery holder 2 shown is arranged opposite to one end of the cylindrical battery 1 inserted in the holding cylinder 20, that is, the exposure window 8 is only provided at the end of the second holder 2Y in the figure. Although not shown in the figure, the battery holder can also be arranged opposite to the ends of the cylindrical battery inserted in the holding cylinder, that is, the exposure windows are provided at the ends of the first holder and the second holder respectively. This structure can fix the two ends of the cylindrical battery to the battery holder, so that the rotation of the cylindrical battery can be further effectively prevented.

[0079] (Bonded component 5)

[0080] The adhesive member 5 fixes the exposed portion of the cylindrical battery 1 exposed from the exposure window 8 of the holding cylinder 20 to the battery holder 2, and prevents the cylindrical battery 1 from rotating inside the holding cylinder 20. As such an adhesive member 5, an adhesive tape 5A or an adhesive 5B can be used.

[0081] The adhesive tape 5A can be an adhesive tape having an adhesive layer or an adhesive layer provided on one side of a strip-shaped sheet. The adhesive tape 5A is bonded to the exposed portion of the cylindrical battery 1 exposed from the exposure window 8 using the adhesive layer or the adhesive layer provided on the one side as an adhesive surface, and the adhesive surface is also bonded to the opening edge adjacent to the exposed portion, thereby fixing the cylindrical battery 1 to the battery holder 2. Therefore, the adhesive tape 5A is bonded to the exposed portion of the cylindrical battery 1 exposed from the exposure window 8 and the opening edge of the exposure window 8, and is fixed to the battery holder 2.

[0082] For the adhesive member 5 as the adhesive 5B, for example, a liquid or gel-like member or a solid member can be used. For the adhesive 5B, it is preferable to use an adhesive that cures in a short time and exhibits excellent adhesive strength. As such an adhesive, for example, an epoxy-based adhesive or an acrylic-based adhesive can be used. Thus, when the adhesive member 5 is set as the adhesive 5B, for example, Fig.12 As shown, the holding cylinder 20 can be cut and opened so that the opening edge of the exposure window 8 is in the radial direction of the cylindrical battery 1 .

[0083] Fig.12The exposure window 8 shown can also be set as a front view rectangular shape as described above, and the front view rectangular shape is formed by a pair of first opening edges 8A cut along the generatrix direction of the retaining cylinder 20, and a pair of second opening edges 8B cut along the direction intersecting the first opening edges 8A. Fig.12 As shown, the adhesive 5B applied to the exposure window 8 of this shape can be applied at least to the boundary portion between the pair of first opening edges 8A and the outer peripheral surface 12 of the cylindrical battery 1. This structure fixes the first opening edge 8A provided in the rotation direction of the cylindrical battery 1 to the outer peripheral surface of the cylindrical battery 1 via the adhesive 5B, and thus has the advantage of being able to more effectively prevent the rotation of the cylindrical battery 1. Furthermore, as shown by the dashed lines in the figure, the adhesive 5B can also be filled throughout the entire exposure window 8.

[0084] Furthermore, the structure in which the cylindrical battery 1 is fixed to the battery holder 2 using the adhesive 5B as the adhesive member 5 does not necessarily require the shape of the exposure window 8 to be set to a rectangular shape in the front view, and can also be set to various shapes, such as a circular, elliptical, or polygonal shape. Furthermore, the adhesive 5B bonded to the outer peripheral surface 12 of the cylindrical battery 1 is fixed to the opening edge of the exposure window 8. Even if the bonding strength between the adhesive 5B and the battery holder 2 is reduced and becomes a peeled state, the adhesive 5B is firmly bonded to the outer peripheral surface 12 of the cylindrical battery 1, so that the adhesive 5B acts as a stopper arranged in the exposure window 8 to suppress the rotation of the cylindrical battery 1. Therefore, as for the adhesive, an adhesive having excellent bonding strength to the outer peripheral surface 12 of the cylindrical battery 1 can also be used. As such an adhesive 5B, for example, an epoxy-based adhesive or an acrylic-based adhesive can be used.

[0085] (Lead plate 3)

[0086] Furthermore, the battery pack 100 shown in the figure connects the end surface electrodes 11 at both ends of a plurality of cylindrical batteries 1 held in a fixed position in a battery holder 2 via a lead plate 3. The lead plate 3 is manufactured by stamping a metal plate having excellent conductivity, and is welded and fixed to the end surface electrodes 11 provided on the end surfaces of the cylindrical batteries 1 in the battery holder 2. Figure 2 as well as Figure 3 In the illustrated battery assembly 10 , eight cylindrical batteries 1 are connected in series and in parallel via lead plates 3 . Figure 4 The battery assembly 10 is configured by connecting four cylindrical batteries 1 arranged in two rows and four layers in parallel to form a parallel unit 1X, and connecting the left and right parallel units 1X to form a battery block 1Y in which eight cylindrical batteries 1 are connected in series and four are connected in parallel. Figure 3 As shown, on the third surface 2C of the box-shaped battery holder 2, two sets of parallel cells 1X are connected in series via the intermediate lead plate 3B, and as shown in FIG. Figure 5 as well as Figure 7 As shown, the output sides of the parallel cells 1X connected in series are connected to the output lead plate 3A at the first surface 2A of the battery holder 2 .

[0087] The output lead plate 3A includes, on the output side of the battery block 1Y, a first output lead plate 3Aa for connecting the first electrodes 11A of the plurality of cylindrical batteries 1 constituting the parallel unit 1X, and a second output lead plate 3Ab for connecting the second electrodes 11B. Figure 3 The first output lead plate 3Aa shown is connected to the first electrodes 11A disposed on the right side of the first surface 2A of the battery holder 2 having a box-shaped outer shape and adjacent to each other in the upper and lower directions. Figure 3 The first output lead plate 3Aa shown is a shape in which a laminated portion 31 and a welded portion 33 are alternately connected. The laminated portion 31 is laminated on the surface of the opening edge of the connection window 24 on the surface of the battery holder 2, and the welded portion 33 is formed in a step shape one level lower than the laminated portion 31 and is connected to the first electrode 11A arranged in the connection window 24. The first output lead plate 3Aa is bent so that the longitudinal cross-sectional shape is a substantially rectangular wave shape through the laminated portion 31 and the welded portion 33 that are alternately connected. The first output lead plate 3Aa connects the first electrodes 11A of the four cylindrical batteries 1, and therefore has four welded portions 33 on the upper and lower sides, and laminated portions 31 are provided between and outside these welded portions 33.

[0088] The intermediate lead plate 3B includes a plate-shaped laminated portion 38, which is arranged over almost the entire surface of the third surface 2C of the battery holder 2 and is connected to the end surface electrodes 11 of the cylindrical batteries 1 adjacent to each other vertically and horizontally. The intermediate lead plate 3B connects the cylindrical batteries 1 adjacent to each other vertically and horizontally in parallel via the plate-shaped laminated portion 38 on the third surface 2C of the battery holder 2, and connects the cylindrical batteries 1 adjacent to each other horizontally and horizontally in series. The intermediate lead plate 3B has a welded portion 33, which is welded to the end surface electrodes of the cylindrical batteries 1, provided on the plate-shaped laminated portion 38. The welded portion 33 is extended from the plate-shaped laminated portion 38 with a height difference, so that even when there is a height difference between the surface of the battery holder 2 and the surface of the end surface electrode 11, the welded portion 33 is in surface contact with the surface of the end surface electrode 11, thereby improving the reliability of welding. In the present embodiment, the intermediate lead plate 3B connects the cylindrical batteries 1 adjacent to each other on the left and right in series, and is therefore formed in a flat plate shape without a height difference at the plate-shaped stacked portion 38 connected in series.

[0089] Furthermore, the second output lead plate 3Ab is also provided with a welding portion 33 connected to the second electrode 11B in the plate-shaped plate-shaped laminated portion 38 that connects the second electrode 11B of the adjacent cylindrical battery 1. Here, in the second output lead plate 3Ab and the intermediate lead plate 3B, the welding portion 33 connected to the second electrode 11B is connected to the plate-shaped laminated portion 38 via the fusible portion 41 extending in an elongated shape, and the fusible portion 41 is fused when an overcurrent flows, thereby forming a structure that can reliably disconnect the cylindrical battery 1 from the lead plate 3.

[0090] Furthermore, the lead plate 3 is provided with a connection terminal portion 39 protruding upward for connection with the circuit substrate 4. The connection terminal portion 39 led out from the output lead plate 3A is connected to the circuit substrate 4, and the output of the battery block 1Y is supplied to the circuit substrate 4. The connection terminal portion 39 led out from the intermediate lead plate 3B is connected to the circuit substrate 4, and the intermediate voltage of the battery block 1Y is supplied to the circuit substrate 4.

[0091] (Circuit board 4)

[0092] The circuit board 4 is mounted with electronic circuits such as a voltage detection circuit for detecting the total potential and the intermediate potential of the battery block 1Y obtained by connecting the cylindrical batteries 1 in series or in parallel, a control circuit for controlling charging and discharging, and a protection circuit. The circuit board 4 is formed in a rectangular shape and is arranged in a storage area 25 provided on the upper part of the battery holder 2.

[0093] (Insulation board)

[0094] Furthermore, although not shown, the battery pack can include an insulating plate laminated on the surface of the lead plate 3 fixed to the battery holder 2, covering the lead plate 3 for insulation. The insulating plate is made of resin or paper, and is preferably an insulating plate that is inexpensive and easy to handle, and has excellent heat resistance and flame retardancy to the heat of exhaust such as gas discharged from the cylindrical battery 1. As such an insulating plate, for example, aramid paper (Nomex [registered trademark] manufactured by DuPont) can be used. The above insulating plate can be composed of, for example, a first insulating plate arranged on the first surface 2A of the battery holder 2 having a box-shaped outer shape and covering the output lead plate 3A, a second insulating plate arranged on the third surface 2C of the battery holder 2 and covering the intermediate lead plate 3B, a third insulating plate arranged on the second surface 2B of the battery holder 2 and covering the connection terminal portion 39 of the first output lead plate 3Aa, and a fourth insulating plate arranged on the fourth surface 2D of the battery holder 2 and covering the connection terminal portion 39 of the second output lead plate 3Ab.

[0095] (Exterior film 7)

[0096] like Figure 1As shown, the battery assembly 10 in which an insulating plate is arranged on the surface of the lead plate 3 and the surface of the circuit board 4 is covered with an insulating member 6 is covered with an exterior sheet 7. Figure 2 As shown, the outer sheet 7 is a heat-shrinkable bag or tube, and is heat-shrunk in a state where the battery assembly 10 is contained inside, thereby covering. For such an outer sheet 7, it is preferable to use a resin such as PET that has excellent insulation and stability. In particular, a shrink tube made of PET resin is inexpensive and preferred as a heat-shrink tube. The outer sheet 7 is melted by the high-temperature gas and other exhaust discharged from the safety valve of the first electrode 11A of the cylindrical battery 1, and the exhaust is quickly discharged to the outside of the battery pack 100.

[0097] (Pinout 18, Connector 19)

[0098] Further, Figures 1 to 5 The battery pack 100 shown connects a plurality of lead wires 18 to the circuit substrate 4 and leads the plurality of lead wires 18 to the outside from the battery assembly 10. The lead wires 18 include positive and negative power lines and signal lines, and are directly connected to a connector of a device in which the battery pack 100 is placed. The plurality of lead wires 18 are connected to the circuit substrate 4 at one end and to a connector 19 at the other end.

[0099] The above-described battery pack 100 is assembled through the following steps.

[0100] (1) The cylindrical battery 1 and the non-melting plate 13 are arranged and connected at the fixed position of the first holder 2X and the second holder 2Y. The first holder 2X and the second holder 2Y are connected in a state where the cylindrical battery 1 is inserted into each battery storage portion 21 and the non-melting plate 13 is inserted into each insertion gap 14 of the partition wall portion 23. The first holder 2X and the second holder 2Y are connected at a fixed position via the built-in cylindrical battery 1 and the non-melting plate 13, and are further connected so as not to be separated by a locking structure provided at a position where the first holder 2X and the second holder 2Y face each other.

[0101] (2) The outer peripheral surface 12 of the cylindrical battery 1 exposed from the exposure window 8 opened in each holding cylinder 20 of the battery holder 2 is fixed to the battery holder 2 via the adhesive member 5. When the adhesive member 5 is an adhesive tape 5A, the adhesive surface of the adhesive tape 5A is bonded and fixed to the outer peripheral surface 12 of the cylindrical battery 1 exposed from the exposure window 8 and the opening edge of the exposure window 8. When the adhesive member 5 is an adhesive 5B, after applying the adhesive 5B to the boundary between the outer peripheral surface 12 of the cylindrical battery 1 exposed from the exposure window 8 and the opening edge of the exposure window 8, the adhesive 5B is cured to fix the outer peripheral surface 12 of the cylindrical battery 1 to the battery holder 2.

[0102] (3) The end electrodes 11 of the cylindrical batteries 1 exposed from both end surfaces of the battery holder 2 are connected to the lead plates 3, and all the cylindrical batteries 1 accommodated in the battery holder 2 are electrically connected. The lead plates 3 are electrically connected and fixed to the end electrodes 11 of the cylindrical batteries 1 by welding.

[0103] (4) The circuit board 4 is connected to the fixed position of the battery holder 2 . Figure 3 The battery holder 2 shown has a storage area 25 on the upper surface, and the circuit board 4 is arranged at a fixed position in the storage area 25 .

[0104] (5) The circuit board 4 connected to the battery holder 2 is electrically connected to the connection terminal portion 39 led out from the lead plate 3. The connection terminal portion 39 is arranged at a fixed position on the circuit board 4 and is electrically and physically connected to the circuit board 4 by spot welding or the like. The lead wire 18 connected to the circuit board 4 is led out to the outside, and the upper surface of the battery holder 2 is covered with an insulating member 6 for insulation. In the above state, as shown in FIG. Figure 2 As shown, a battery assembly 10 is manufactured.

[0105] (6) Covering the battery assembly 10 with the exterior sheet 7. Figure 2 As shown, the exterior sheet 7 is provided as a heat-shrinkable bag or tube, and is covered by heat shrinking while the battery assembly 10 is accommodated inside.

[0106] The above battery pack 100 is built into the device body of an electrical device such as a speaker and used as a power source. The battery pack 100 supplies power to the main device via a lead wire 18 led out to the outside, or supplies power from the main device to charge the built-in cylindrical battery 1. The lead wire 18 led out from the battery pack 100 is connected to the connection connector on the main body side via an output connector 19 connected to the front end to supply power.

[0107] Industrial Applicability

[0108] The battery pack of the present invention can be suitably used as a power source for electric devices such as wireless speakers, electric cleaners, and electric tools, and can also be suitably used as a power source device for mobile objects such as power-assisted bicycles and electric carts.

[0109] -Description of Reference Numerals-

[0110] 100…Battery pack

[0111] 1…Cylindrical battery

[0112] 1X...Parallel Unit

[0113] 1Y...Battery Block

[0114] 2…Battery holder

[0115] 2X…First retainer

[0116] 2Y…Second retainer

[0117] 2A…Side 1

[0118] 2B…side 2

[0119] 2C…side 3

[0120] 2D…Fourth side

[0121] 3…Lead plate

[0122] 3A...Output lead plate

[0123] 3Aa…First output lead plate

[0124] 3Ab…Second output lead plate

[0125] 3B…Middle lead plate

[0126] 4…Circuit board

[0127] 5… Bonding components

[0128] 5A…Adhesive tape

[0129] 5B…Adhesive

[0130] 6…Insulating components

[0131] 7…Exterior film

[0132] 8…Exposure window

[0133] 8A…First opening edge

[0134] 8B…Second opening edge

[0135] 10…Battery assembly

[0136] 11…End electrode

[0137] 11A…First electrode

[0138] 11B…Second electrode

[0139] 12…Outer surface

[0140] 13…Non-melting plate

[0141] 14…Insert gap

[0142] 18…Pinout

[0143] 19…Connector

[0144] 20…Retaining cylinder

[0145] 21…Battery storage area

[0146] 22…Surrounding wall

[0147] 23…Dividing the wall

[0148] 24…Connection window

[0149] 25…Accommodation area

[0150] 26…End panel

[0151] 27…Lock hook

[0152] 28…Locking part

[0153] 29…Cut surface

[0154] 31…Lamination section

[0155] 33…Welding

[0156] 38…Plate-shaped laminated portion

[0157] 39…Connection terminal

[0158] 41…Fuse

[0159] O…Center axis

[0160] P…plane.

Claims

1. A battery pack comprising: Cylindrical batteries; and A battery holder is used to place the cylindrical battery in a fixed position. The battery holder comprises: a holding cylinder portion that accommodates the cylindrical battery inside and covers the outer peripheral surface of the cylindrical battery; The retaining cylinder has an opening for exposing an outer peripheral surface of the contained cylindrical battery to the outside. The exposed portion of the cylindrical battery exposed from the exposure window is fixed to the battery holder via an adhesive member.

2. The battery pack according to claim 1, wherein: The battery pack includes a plurality of the cylindrical batteries, and the battery holder includes a plurality of the holding cylinders for accommodating the plurality of the cylindrical batteries in a mutually parallel posture. The plurality of retaining cylinders include: A partition wall portion disposed between the cylindrical batteries adjacent to each other; and a peripheral wall portion forming an outer side surface of the battery holder, The exposure window is opened in the peripheral wall portion.

3. The battery pack according to claim 2, wherein: The battery pack further comprises: a lead plate for electrically connecting the plurality of cylindrical batteries arranged at fixed positions by the battery holder; The cylindrical battery has end electrodes at both ends. The battery holder includes an end plate portion facing the end surface electrode of the cylindrical battery, and an electrode window for exposing the end surface electrode is provided in the end plate portion. The lead plate is connected to the end surface electrode exposed from the electrode window to connect the plurality of cylindrical batteries in series and / or in parallel.

4. The battery pack according to claim 3, wherein: The battery holder includes the exposure window located at an end portion of the holding cylinder.

5. The battery pack according to any one of claims 1 to 4, wherein: The adhesive member is an adhesive tape, and an adhesive surface of the adhesive tape is adhered to the exposed portion of the cylindrical battery exposed from the exposure window and to an opening edge of the exposure window.

6. The battery pack according to claim 5, wherein: The exposure window is a rectangular shape in a main view, wherein the rectangular shape in a main view is formed by a pair of first opening edges cut along the generatrix direction of the retaining cylinder, and a pair of second opening edges cut along a direction intersecting the first opening edges. The opening edge portion to which the adhesive tape is bonded is set as a cut surface of the holding tube portion cut along the pair of first opening edges.

7. The battery pack according to claim 6, wherein: In a transverse cross-sectional view of the holding cylinder, the cut surfaces formed on both sides of the exposure window are planar surfaces extending in a tangential direction of a center portion of the outer peripheral surface of the cylindrical battery exposed from the exposure window.

8. The battery pack according to claim 6, wherein: The cut surface is an inclined surface or a curved surface inclined relative to a plane including a central axis of the cylindrical battery and the first opening edge, and forms an obtuse angle with the outer peripheral surface of the cylindrical battery exposed from the exposure window.

9. The battery pack according to any one of claims 2 to 4, wherein: The battery holder has the plurality of exposure windows opened in the holding cylinder arranged on a front sight line. The adhesive member is an adhesive tape, and the adhesive tape is attached across the plurality of exposure windows to fix the plurality of cylindrical batteries to the battery holder.

10. The battery pack according to any one of claims 1 to 4, wherein: The bonding member is an adhesive.

11. The battery pack according to claim 10, wherein: The exposure window is a rectangular shape in a main view, wherein the rectangular shape in a main view is formed by a pair of first opening edges cut along the generatrix direction of the retaining cylinder, and a pair of second opening edges cut along a direction intersecting the first opening edges. The adhesive is applied at least to a boundary portion between a pair of the first opening edges and the outer peripheral surface of the cylindrical battery.

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