JP2008027616A - Battery pack and manufacturing method of battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a battery pack, and a manufacturing method of a battery pack, mechanically connecting tip parts of case half bodies housing battery cells by mutual hooking of components themselves. <P>SOLUTION: A first case 104 and a second case 105 both U-shaped are fitted to side parts of the battery cell 101 of a rectangular shape so as to make up an outer frame. Rest holes 124, 125 of the first case 104 are arranged at a place where conductive plates 108, 109 do not exist, therefore, hooking claws 126, 127 of the second case 105 to be engaged with these can be made thicker by as much as the thickness of the conductive plates 108, 109. Reverse ribs 128, 129 with cross sections at four points L-shaped are to get spatially fitted to tips of ribs 131, 132 at four points, so that engagement of the both cases 104, 105 can be simply and surely made. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a battery pack used for a small electronic device such as a mobile phone and a method for manufacturing the battery pack. For example, the battery pack having a shape close to a rectangular parallelepiped used for a mobile phone and a method for manufacturing the battery pack are disclosed. About.

  Many small electronic devices such as mobile phones, PHS (Personal Handy-phone System), PDA (Personal Digital Assistant) have been commercialized. Many of these electronic devices use a battery such as a lithium secondary battery as a battery pack having a shape close to a rectangular parallelepiped that can be attached to and detached from the main body of the electronic device. As electronic devices become smaller and lighter, there is a strong demand from the market for smaller and lighter battery packs. In addition, as electronic devices become more sophisticated, there is a strong demand for larger capacity battery packs.

  The battery pack is constituted by a battery cell as a battery main body such as a lithium secondary battery and an external component such as a protection circuit board combined with the battery cell. The exterior of the battery pack is a heat-shrinkable film such as a label film that covers the outside by placing cells and accessories in a case made of metal, synthetic resin, etc., or a case containing battery cells and accessories Can be broadly divided into those covered with

  Increasing the ratio of the volume of the cell to the volume of the battery pack is important in order to satisfy the demands of both the size reduction of the battery pack accompanying the downsizing of the electronic equipment and the increase of the capacity accompanying the increase in functionality. It becomes a point. On the other hand, since the volume of the battery cell increases at the time of charging or at a high temperature, a certain amount of space is required between the battery cell and the case for housing it. For this reason, in a battery pack of a type in which battery cells are housed in a case, thin molding that reduces the thickness of the case becomes a major issue.

  Conventionally, in a battery pack of a type in which a battery cell is accommodated in a case, it is usual to prepare two resin case halves obtained by cutting the case that seals the battery cell from the central portion. A technique has been widely adopted in which the joint portions of two resin case halves containing battery packs are fused by ultrasonic welding or are bonded and fixed with double-sided tape. However, in this method using two resin case halves, it is necessary to secure a protrusion for melting at the time of ultrasonic welding at the joint, and a problem such as welding misalignment that shifts the position at the time of welding. Will occur. As a result, there were problems in terms of manufacturing cost and component cost.

  On the other hand, the method of fixing the joints of the case halves with a double-sided tape requires a space for attaching the double-sided tape, which is disadvantageous for downsizing the battery pack. In addition, there are problems such as the cost of parts of double-sided tape and the trouble of pasting work.

Therefore, it has been proposed that a rectangular battery cell is attached to the rectangular battery cell so as to surround the side portion thereof, and the battery cell and the frame part are covered with an outer film to form an integrated battery pack (for example, a patent). Reference 1).
Japanese Patent Laying-Open No. 2005-142153 (paragraphs 0049 to 0061, FIG. 2)

  However, in this proposal, a square frame portion is attached around a square battery cell, and a circuit board portion is disposed outside the square frame portion. The frame part is composed of a large number of parts, and after assembling them, the battery cell and the frame part are integrally covered with an exterior film. For this reason, according to this proposal, the number of assembling steps is required, and the manufacturing cost and the part cost cannot be reduced.

  In addition, instead of the method of fusing the case halves by ultrasonic welding, it is also conceivable to hook the case halves with hooks, but when the case thickness is reduced, the cases are hooked together. There is a problem that sufficient strength cannot be maintained and a practical holding structure cannot be realized.

  Accordingly, an object of the present invention is to obtain a battery pack and a method of manufacturing the battery pack in which the tip portions of the case halves containing the battery cells are mechanically connected by engaging the parts.

  In the first aspect of the present invention, (a) a rectangular parallelepiped shape is formed with respect to the first connecting surface as one side surface connected to these side surfaces from a predetermined position of each of the two specific side surfaces facing each other. A battery cell for supplying power having a conductive plate composed of strip-shaped electrodes arranged in parallel to the side surfaces thereof and having a protection circuit connected to the conductive plate on the first connecting surface; A predetermined position of each of the first base portion arranged in parallel to the first connection surface of the rectangular parallelepiped of the battery cell up to both side portions thereof and two specific side surfaces facing each end portion of the first base portion. And a pair of first legs extending to a position that does not reach the end of the side surfaces, each having an opening at the tip of the first legs, and the first base and the pair The three legs of the battery cell by the first leg of A first case having a U-shape that continuously surrounds, and (c) a second base portion that is disposed up to both sides thereof in parallel with a second connection surface that faces the first connection surface of the rectangular parallelepiped. And a pair of second legs extending from the respective ends of the second base part to the ends of the first legs of the first cases on the two specific side surfaces facing each other, and The second leg portion can be formed thicker than the first leg portion of the first case by the thickness of the conductive plate, and has a hooking claw that hooks the opening at the tip. The battery pack is provided with a second case having a U-shape that continuously surrounds the three side surfaces of the battery cell from the opposite side of the first case by the second leg portion.

  That is, in the present invention, the first case and the second case as the case halves are inserted into the rectangular parallelepiped battery cells from opposite sides, and the tips of the first leg portions of the first case are inserted. And the tips of the pair of second legs of the second case are mechanically connected. At this time, since the tip portion of the first leg portion passes through the conductive plate of the battery cell, the opening portion is a space corresponding to this step. In addition, since the conductive plate of the battery cell does not exist at the distal end portion of the second leg portion, the thickness of the first leg portion can be increased by this level difference. Therefore, in the present invention, the distal end portion of the second leg portion is formed as a hooking claw structure, and this portion is hooked to the opening through the space described above, so that the distal end of the first leg portion and the distal end of the second leg portion are connected. It will be multiplied.

  In the invention according to claim 2, (a) it is a rectangular parallelepiped shape, and from a predetermined position of each of the two specific side surfaces facing each other to the first connection surface as one side surface connected to these side surfaces A battery cell for supplying power having a conductive plate composed of strip-shaped electrodes arranged in parallel to the side surfaces thereof and having a protection circuit connected to the conductive plate on the first connecting surface; A predetermined position of each of the first base portion arranged in parallel to the first connection surface of the rectangular parallelepiped of the battery cell up to both side portions thereof and two specific side surfaces facing each end portion of the first base portion. A pair of first legs that extend to a position that does not reach the end of these side surfaces, and is hooked on a portion that can be formed thicker by the thickness of the conductive plate at the tip of these first legs. Having a nail, a first base and a pair of A first case having a U-shape that continuously surrounds the three side surfaces of the battery cell by one leg, and (c) a second connection surface facing the first connection surface of the rectangular parallelepiped. A pair of second bases arranged up to both sides thereof, and a pair of ends extending from the respective ends of the second base to the ends of the first legs of the first cases of the two specific side surfaces facing each other The second leg portion has an opening for hooking a hooking claw on the tip of the second leg portion, and the three side surfaces of the battery cell are attached to the second base portion and the pair of second leg portions. A battery pack is provided with a U-shaped second case that continuously surrounds the opposite side of the first case.

  That is, in the present invention, the first case and the second case as the case halves are inserted into the rectangular parallelepiped battery cells from opposite sides, and the tips of the first leg portions of the first case are inserted. And the tips of the pair of second legs of the second case are mechanically connected. At this time, since the tip portion of the first leg portion passes through the conductive plate of the battery cell, the hooking claw can be formed thicker by this step, so that the thickness of each portion can be ensured. In addition, since the conductive plate of the battery cell does not exist at the distal end portion of the second leg portion, it can pass under the opening of this portion because the hooking claw is hooked. Therefore, in the present invention, the tip end portion of the first leg portion is hooked to the opening through this portion as a hooking claw structure, thereby engaging the tip end of the first leg portion and the tip end of the second leg portion. Become.

  In invention of Claim 7, it is (a) rectangular parallelepiped shape, and it is with respect to the 1st connection surface as one side surface connected with these side surfaces from each predetermined position of the two specific side surfaces which oppose. This battery is provided with respect to a battery cell for supplying power having a conductive plate comprising strip-shaped electrodes arranged in parallel to the side surfaces and having a protection circuit connected to the conductive plate on the first connecting surface. A first base portion disposed parallel to the first connection surface of the rectangular parallelepiped of the cell and extending to both sides thereof, and a predetermined position on each of two specific side surfaces facing each other from the respective end portions of the first base portion And a pair of first legs that extend to a position that does not reach the end of the side surfaces, each having an opening at the tip of the first legs, the first base and the pair of first legs Three sides of the battery cell by the first leg The first case having a U-shape that continuously surrounds the first case, with the first base portion facing the first connection surface, and the first leg portions along the side surfaces of the battery cells. A second base portion that is mounted to both sides of the rectangular parallelepiped in parallel with the second connection surface that faces the first connection surface of the rectangular parallelepiped, and a specific portion that faces from each end of the second base portion It consists of a pair of 2nd leg part extended to the terminal end of each 1st leg part of the 1st case of two side surfaces, These 2nd leg parts are from the 1st leg part of the 1st case. Can be formed thicker by the thickness of the conductive plate, and has a hook claw that hooks the opening at the tip, and the three sides of the battery cell are connected to the first base by the second base and the pair of second legs. A second case having a U-shape that continuously surrounds the opposite side of the case is referred to as a first battery cell. A first step of mounting the first leg portion along the side surface of the battery cell so that the second base portion faces the second coupling surface facing the coupling surface; and (b) the first step. A second step of engaging the tips of the legs of the first and second cases by hooking the hooking claws of the second leg to the opening of the first leg mounted in the step; The entire exposed surface of the battery cell including the legs of the first and second cases except for the first and second connecting surfaces with the first and second cases engaged in the second step. And a third step of covering the substrate with a sheet-like member.

  That is, in the present invention, in the first step, the first case and the second case as case halves are inserted into the rectangular parallelepiped battery cell from opposite sides. The order of insertion may be earlier in the first case, earlier in the second case, or simultaneously. In the second step, each of the first and second cases is obtained by hooking the hook of the second leg to the opening of the first leg using the step or space of the conductive plate of the battery cell. Engage the tips of the legs. In the third step, the battery pack is reinforced by covering the entire exposed surface of the battery cell including the legs of the first and second cases with a sheet-like member.

  In addition, the manufacturing method of the battery pack which the hook nail | claw of a 1st leg part hooks to opening of a 2nd leg part is also possible.

  As described above, in the present invention, since the space of the portion where the conductive plate of the battery cell does not exist is used and only one of the portions is thickened, the ultrasonic welding and the double-sided adhesive bonding are not performed. The case can be fixed to the battery cell. Therefore, it is possible to reduce the size of the battery pack as compared with the conventional case where mechanical connection is performed. Further, compared to the technique using ultrasonic welding or double-sided tape, it is possible to save the mounting error, the cost of parts of the double-sided tape, and the time required for welding and pasting work, thereby reducing the cost of the battery pack.

  Furthermore, the battery cell is wrapped by covering the periphery of the battery cell with a sheet-like member such as a label, so that even if a force in the direction of separating the first case and the second case is applied, the opening of the engaging portion is suppressed. A strong holding structure is realized.

  Hereinafter, the present invention will be described in detail with reference to examples.

  FIG. 1 shows a state in which a battery pack according to an embodiment of the present invention is disassembled. The battery pack 100 is inserted into the battery unit 102 from the side of the protection circuit board 103 on which the battery unit 102 including the battery cell 101 having a substantially rectangular parallelepiped shape and the control circuit for controlling the charge / discharge state attached to the battery cell 101 is mounted. A U-shaped first case 104 and a U-shaped second case which is inserted into the battery unit 102 from the opposite side of the protective circuit board 103 and hooks at the front end portion of the first case 104. The case 105 is configured. Here, the battery unit 102 is a unit provided with a safety element such as a thermal fuse (not shown) in addition to the protective circuit board 103 having a contact terminal for connection to the main device. The battery pack 100 holds the four surfaces constituting the side portion of the battery unit 102 so as to be surrounded by the first case 104 and the second case 105, and winds a label (not shown) to form a finished battery product.

  The battery cell 101 is a secondary battery such as a lithium secondary battery, and a corner portion of the rectangular parallelepiped is rounded in an arc shape. The battery cell 101 has electrodes 106 disposed on the left and right side portions (however, only one is shown in the figure), and is electrically connected to one end of conductive plates 108 and 109, respectively. The conduction plate 108 arranged on the front side in the figure is connected to the protective circuit board 103 via a PTC (Positive Temperature Coefficient Thermistor) element 111 for preventing abnormal current.

  The first case 104 includes a base 114 that is parallel to the protection circuit board 103 and legs 115 and 116 that extend from both ends of the base case 114 toward both sides of the battery cell 101. The second case 105 includes a base portion 117 that is parallel to the protection circuit board 103 and leg portions 118 and 119 that extend from both ends of the base case 117 toward both sides of the battery cell 101. The first case 104 and the second case 105 are made of synthetic resin such as polycarbonate or ABS (Acrylonitrile butadiene styrene plastics) resin, and the thickness of the planar portion is 0.3 to 0.9 mm.

  The lengths of the leg portions 115 and 116 of the first case 104 are longer than those of the leg portions 118 and 119 of the second case 105. The base 114 of the first case 104 is provided with a pair of projections 121 and 122 for engaging the battery pack 100 in an electronic device main body (not shown) and terminals (not shown) protruding on the electronic device main body side. Openings 123 for connection to corresponding parts of the protection circuit board 103 are arranged.

  Receiving holes 124 and 125 are formed in the tip portions of the legs 115 and 116 of the first case 104, respectively. Hook claws 126 and 127 for engaging with the receiving holes 124 and 125 respectively are disposed at the tip portions of the leg portions 118 and 119 of the second case 105. In addition, reversing ribs 128 and 129 having L-shaped cross sections are formed at both ends of the hooking claws 126 and 127 at the tips of the legs 118 and 119, respectively. The inversion ribs 128 and 129 have a function of preventing warpage unique to the thin molded product. Accordingly, the phenomenon in which the legs 118 and 119 are warped in the direction away from the both sides of the battery cell 101 is prevented, and in the state where the first case 104 and the second case 105 are combined, these are the batteries. The situation of falling off from the cell 101 is prevented.

  In the figure of the leg parts 115 and 116 of the first case 104, the upper part and the lower part are thicker than the center part and constitute rib parts 131 and 132. The tips of the rib portions 131 and 132 are fitted to the reversing ribs 128 and 129. The rib portion 131 is thick so as to avoid the conductive plate 108. The other rib portions 132 are also thick so as to avoid the conductive plate 109.

  FIG. 2 shows a state in which the first case and the second case are attached to the battery cell. A first case 104 and a second case 105 are inserted into the battery unit 102 of the battery pack 100 from opposite sides. Since the leg portions 115 and 116 of the first case 104 are sufficiently longer than half the length of the side portion of the battery cell 101 constituting the battery pack 100, the top of the electrode 106 shown in FIG. It has been broken. The same applies to the legs 115.

  A region 141 surrounded by a circle in FIG. 2 is a place where the first case 104 and the second case 105 are engaged. This will be described next.

  FIG. 3 is an enlarged view of a portion where the first case and the second case are engaged. In the state where the leg portion 115 on the first case 104 side is completely pushed into the battery unit 102 not shown in this figure, the receiving hole 124 is formed in the conductive plate as described above (see the conductive plate 108 in FIG. 1). It exists in the position that passed. Therefore, a space corresponding to the absence of the conductive plate exists between the receiving hole 124 and the side portion of the battery cell 101 (see FIG. 1). The hook claw 126 on the second case 105 side passes through this space and is hooked in the receiving hole 124. At this time, a pair of rib portions 131 and 131 (only one is shown) exposed on both sides of the tip of the leg portion 115 are fitted inside the reversing ribs 128 and 128 on the leg portion 118 side that are arranged to face each other. Will do. The same applies to the other leg portions 116 and 119 (see FIG. 1) not shown.

  FIG. 4 shows a state in which the first case and the second case of the battery pack are engaged with each other. Of these, FIG. 4A is a view from the base 114 side of the first case 104, and FIG. 4B is an end surface of the battery pack 100 cut in the AA direction shown in FIG. It is a representation. However, details of the internal structure of each component are omitted.

  A region 151 surrounded by a circle in FIG. 4B is one of the two places where the first case 104 and the second case 105 are engaged. Each engaging part located up and down in the figure has the same structure. Accordingly, the structure shown in the area 151 will be described as an example.

FIG. 5 is an enlarged view of the main part of FIG. A hooking claw 126 at the tip of the leg 118 of the second case 105 is hooked in a receiving hole 124 provided at the tip of the leg 115 of the first case 104. Under the leg 115, the protruding electrode 106 of the battery cell 101 and the conductive plate 108 electrically connected thereto are present. In the battery cell 101, the electrode 106 in contact with the conductive plate 108 is negative, and the other surface portions are positive. The periphery of the conductive plate 108 is covered and insulated by a sheet-like insulator 152. Therefore, although the insulator 161 is disposed under the leg portion 118 of the second case 105, the distance d ₁ from the upper surface of the leg portion 118 to the upper surface of the insulator 152 is the conductive plate 108 from the upper surface of the leg portion 115. It is longer than the distance d ₂ to the upper surface of.

  FIG. 6 shows a state in which the first case and the second case of the battery pack conventionally used for reference are engaged with each other. FIG. 7 is an enlarged view of the main part of FIG. It is shown. In these figures, parts having a change in the object of illustration, such as parts, are marked with “′” (dash).

  In the conventional battery pack 100 ', the legs 115' and 116 'of the first case 104' are shorter than the legs 115 and 116 of the present embodiment, and the legs 118 'and 119' of the second case 105 are shorter. It is longer than the legs 118 and 119 of the second case 105 of this embodiment. Specifically, the leg portion 115 ′ of the first case 104 ′ is substantially equal to the leg portion 118 ′ of the second case 105. For this reason, the region where these tips are engaged is a region above the protruding electrode 106 of the battery cell 101 as shown by a region 151 'circled in FIG. 6B.

As shown in a region 151 ′ enlarged in FIG. 7, the conduction plate 108 ′ covers the entire area of the electrode 106 in the short direction of the battery cell 101 indicated by an arrow 171. As a result, the distance d ₂ is from the upper surface of the leg portion 118 ′ to the upper surface of the conduction plate 108, and is equal to the distance d ₂ from the upper surface of the leg portion 115 ′ to the upper surface of the conduction plate 108. That is, as compared with FIG. 5 of the present embodiment, when the thickness of the leg portion 115 is equal to the thickness of the leg portion 115 ′, the thickness of the leg portion 118 ′ is equal to the thickness of the leg portion 115 ′. This is because the sum of the thickness of the tip portion of the leg portion 115 ′ of the first case 104 ′ and the thickness of the portion disposed below the hooking claw 126 ′ is the leg portion 115 ′ of the first case 104 ′. It means that the thickness is less than or equal to.

  In the case of the present embodiment shown in FIG. 5, the sum of the thickness of the tip portion of the leg 115 of the first case 104 and the thickness of the portion disposed below the hooking claw 126 is the first It is much thicker than the thickness of the leg 115 of the case 104. As can be understood from these comparisons, in this embodiment, the portion where the leg portion 115 of the first case 104 and the leg portion 118 of the second case 105 engage with each other is removed from the protruding electrode 106, thereby causing the leg portion 118. Can be made thicker than before, and engagement can be performed firmly.

  Further, in the case of the present embodiment, as shown in FIG. 1, when the tips of the hooking claws 126 and 127 are engaged with the receiving holes 124 and 125 and are caught, Spatial recesses whose four corners are specified by the inverted ribs 128, 128, 129, and 129 having an L-shaped cross section and spatial corners whose four corners are specified by the rib parts 131, 131, 132, 132 of the first case 104 It becomes the state which a convex part fits. This fitting structure enables a battery case holding structure that does not cause the warp unique to the thin-walled molded product. In addition, the outer shape and volume of the battery pack 100 itself is the same as that of the conventional battery pack 100 ′.

  FIG. 8 shows a completed state of the battery pack. As shown in FIG. 4, after attaching the first case 104 and the second case 105 to the battery cell 101, the label 181 is wound around except for the bases 114 and 117, so that the battery of this embodiment is used. The pack 100 is completed.

  As described above, in the battery pack 100 of the present embodiment, the case of ultrasonic welding or double-sided tape bonding, which has conventionally been the mainstream, is not used for the exterior case. In addition, since a space that has not been conventionally used in the battery pack 100 is used for the connection between the first case 104 and the second case 105, the external size is increased, the capacity of the battery cell 101 is increased. Will not decrease.

  The first case 104 is provided with rib portions 131 and 132 so as to avoid the conduction plates 108 and 109 arranged on the side portion on the battery cell 101 side shown in FIG. Thereby, also about the 1st case 104, the curvature peculiar to a thin molded product can be prevented. Further, in the embodiment, the reversing ribs 128 and 129 having a L-shaped cross section of the second case 105 are formed on the leg portions of the first case 104 when the hooking claws 126 and 127 are inserted into the receiving holes 124 and 125. 115 is prevented from moving away from the side of battery cell 101.

  Therefore, even when the thickness of the first case 104 and the second case 105 is reduced with the miniaturization of the battery pack 100, it takes time to engage with the case 104, or the case 104 is detached after the engagement. There is no. Further, by winding the label 181 shown in FIG. 8, even if a force in the direction of separating the first case 104 and the second case 105 is applied, this is prevented and the battery pack 100 having a strong holding structure. Is completed. In addition, by winding the label 181, the connecting portion between the first case 104 and the second case 105 is not visible in appearance, and the first case 104 and the second case 105 are separated unless the label 181 is peeled off. Becomes impossible.

<Modification of the invention>

  FIG. 9 shows a state in the middle of assembling the battery pack in the modification of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In the battery pack 100A of this modification, the legs 115A and 116A are different from the previous embodiment in that their tip portions are closer to the second case 105 side than the conduction plates 108 and 109 shown in FIG. It is common. However, the tip end portion of the leg portion 115A of the first case 104A in which the receiving hole 124 is arranged in this modification is flat, and the rib portion 131A does not particularly protrude. The same applies to the rib 132A (not shown) at the tip of the leg 116A. In addition, with respect to the leg portion 118A on the second case 105A side, only the hooking claw 126 protrudes from the tip portion. The leg 119A side is the same, although not shown.

  Therefore, in the modification of the present invention, the legs 115A, 116A are in the directions of the arrows 201, 202 when the tip portions of the first and second cases 104A, 105A are engaged with the receiving holes 124, the hooking claws 126, and the like. Some warping may occur. However, the legs 115A and 116A may be engaged while being pressed so as not to warp, and the thickness of the legs 118A and 119A on the second case 105A side such as the hooking claws 126 is the same as in the embodiment. Since it is thick, no structural problems occur.

  In the embodiment and the modification shown in FIG. 9, the hooking claws 126 and 127 are arranged on the second case 105 and 105A side. Conversely, the hooking claws 126 and 127 are placed on the first case 104 and 104A side. Of course, it may be arranged. Further, in the embodiment and the modification, the receiving holes 124 and 125 are provided on the side of the thin leg portion. However, these holes may be any openings that can hook the hooking claws 126 and 127, and need not be holes. Of course it is not.

In the embodiment, the reversing ribs 128, 128, 129, and 129 of the second case 105 have L-shaped cross sections, but the shape of the members that protrude from the tip portions of the legs 115 and 116 of the first case 104 Of course, various shapes such as a U-shape may be used.

It is a perspective view which shows the state which decomposed | disassembled the battery pack in one Example of this invention. It is a perspective view showing the state which attached the 1st case and the 2nd case to the battery cell in a present Example. It is the principal part perspective view which expanded and showed the engagement location of the 1st case and the 2nd case in a present Example. It is the front view showing the state with which the 1st case and 2nd case of the battery pack were engaged in the present Example, and the end view showing the end surface cut | disconnected by the AA direction. It is sectional drawing which expanded and showed the principal part of FIG. 4 (B). It is the front view showing the state with which the 1st case and the 2nd case were engaged with the battery pack employ | adopted conventionally, and the end elevation showing the end surface cut | disconnected by the AA direction. It is sectional drawing which expanded and showed the principal part of FIG. 6 (B). It is the perspective view showing the completion state of the battery pack of a present Example. It is a perspective view showing the state in the middle of the assembly of the battery pack in the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Battery pack 101 Battery cell 102 Battery unit 103 Protection circuit board 104, 104A 1st case 105, 105A 2nd case 106 Electrode 108, 109 Conduction plate 114, 117 Base 115, 115A, 116, 116A, 118, 118A, 119, 119A Leg portion 124, 125 Receiving hole 126, 127 Hook 128, 129 Reversing rib 131, 132 Rib portion

Claims (8)

A conductive plate made of a strip-shaped electrode is formed on a first connecting surface as one side surface that is connected to these side surfaces from a predetermined position of each of two specific side surfaces facing each other. A battery cell for power supply, which is arranged in parallel to the side surface and includes a protection circuit connected to the conductive plate on the first coupling surface;
A first base portion disposed in parallel to the first connection surface of the rectangular parallelepiped shape of the battery cell up to both sides thereof, and two specific side surfaces facing each other from respective end portions of the first base portion. The pair of first legs that extend beyond the respective predetermined positions and extend to positions that do not reach the end of the side surfaces, each having an opening at the tip of the first legs, A first case having a U-shape that continuously surrounds three side surfaces of the battery cell by the first base and the pair of first legs;
A second base portion disposed up to both side portions of the rectangular parallelepiped shape in parallel with the second connection surface facing the first connection surface, and the opposite specific ends from the respective end portions of the second base portion It comprises a pair of second legs extending to the end of each first leg of the first case on two side surfaces, the second legs being the first legs of the first case. The conductive plate can be formed to be thicker than the conductive plate by the thickness of the conductive plate, and has a hooking claw that hooks the opening at the tip, and the battery cell 3 is formed by the second base and the pair of second legs. And a second case having a U-shape that continuously surrounds one side surface from the opposite side of the first case. A conductive plate made of a strip-shaped electrode is formed on a first connecting surface as one side surface that is connected to these side surfaces from a predetermined position of each of two specific side surfaces facing each other. A battery cell for power supply, which is arranged in parallel to the side surface and includes a protection circuit connected to the conductive plate on the first coupling surface;
A first base portion disposed in parallel to the first connection surface of the rectangular parallelepiped shape of the battery cell up to both sides thereof, and two specific side surfaces facing each other from respective end portions of the first base portion. A pair of first legs extending beyond the respective predetermined positions and not reaching the end of the side surfaces, the thickness of the conductive plate at the tip of the first legs. A first case having a hook-like claw in a thick formable portion and having a U-shape that continuously surrounds three side surfaces of the battery cell by the first base and the pair of first legs. When,
A second base portion disposed up to both side portions of the rectangular parallelepiped shape in parallel with the second connection surface facing the first connection surface, and the opposite specific ends from the respective end portions of the second base portion It has a pair of second legs extending to the end of the first leg of each of the first cases on the two side surfaces, and has an opening for hooking the hooking claw on the tip of the second leg. And a second case having a U-shape that continuously surrounds the three side surfaces of the battery cell from the opposite side of the first case by the second base and the pair of second legs. A battery pack comprising:   The first and second cases are attached to the battery cell, and the other surfaces of the battery cell excluding at least the first connection surface in a state in which the end portions of the legs are engaged with the opening by the hooking claws. The battery pack according to claim 1, further comprising a covering member that covers each of the legs together with each leg portion.   3. The first leg of the first case is formed with ribs that are thick on both sides so as to avoid the conductive plate. Battery pack.   The surfaces of the leg portions of the first case and the second case that are far from the side surfaces of the battery cells form the same surface in a state where the tip portions of the leg portions are engaged with the openings by the hooking claws. The battery pack according to claim 1 or 2, wherein the battery pack is provided.   A first surface that is one step closer to the side surface of the battery cell than a surface far from the side surface of the battery cell is formed at a tip portion of the first leg portion of the first case. A portion corresponding to the first surface of the first case in the vicinity of the tip portion of the second leg portion of the case where the hooking claw is formed is formed from the first surface to the side surface of the battery cell. 3. The battery pack according to claim 1, wherein the second surface is formed at a position slightly further away from the first surface so as to face the first surface. 4.   A third surface is formed at the distal end portion of the first leg portion of the first case so as to be retracted from the respective side end of the side surface of the battery cell to the center of the first stage, and the second surface of the second case. The portions of the leg portions corresponding to the third surface of the first case in the vicinity of the tip portions where the hooking claws are formed are located on the side of the battery cell from the third surface. 4. The battery pack according to claim 1, wherein a fourth surface is formed on the portion side so as to face the third surface. 4. A conductive plate made of a strip-shaped electrode is formed on a first connecting surface as one side surface that is connected to these side surfaces from a predetermined position of each of two specific side surfaces facing each other. For the battery cell for power supply provided with a protection circuit connected to the conductive plate on the first coupling surface, the first rectangular-parallelepiped shaped first of the battery cell. A first base portion arranged in parallel to the connecting surface up to both sides thereof, and the respective predetermined positions of the two specific side surfaces facing each other from the respective end portions of the first base portion, and these side surfaces A pair of first legs extending to a position not reaching the end of the first leg, each having an opening at the tip of the first leg, and the first base and the pair of first legs. 3 sides of battery cell by part A first case having a U-shape that continuously surrounds the first case is placed along the side surface of the battery cell so that the first base faces the first connecting surface. A second base portion that is mounted to both sides of the rectangular parallelepiped shape in parallel with the second connection surface facing the first connection surface, and each end portion of the second base portion. And a pair of second legs extending to the end of the first leg of each of the first cases on the two opposing side surfaces, the second legs being the first legs. The case can be formed thicker than the first leg of the case by the thickness of the conductive plate, and has a hooking claw that hooks the opening at the tip, and the second base and the pair of second legs The three side surfaces of the battery cell continuously from the opposite side of the first case The first leg portion is formed so that the second base portion is opposed to the second connection surface of the battery cell facing the first connection surface of the battery cell. Mounting along the side of the battery cell; and
A second hook for engaging the tips of the leg portions of the first and second cases by hooking the hooking claws of the second leg portion into the opening of the first leg portion mounted in the first step. And the steps
In the state where the first and second cases are engaged in the second step, the legs of the first and second cases are included except for the first and second connecting surfaces. And a third step of covering the entire exposed surface with a sheet-like member.

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