JP2016066451A - Manufacturing method of battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a battery pack, capable of suppressing looseness of a battery cell in an inner part of a housing hole.SOLUTION: A manufacturing method of a battery pack is a method for manufacturing the battery pack comprising a block 21 to which a housing hole 22 is formed and a battery cell 31 to be housed in the housing hole 22. The housing hole 22 includes: an enlarged part 26 having a relatively large opening area; a reduction part 27 which is provided side by side with the enlarged part 26 in an insertion direction of the battery cell 31 to the housing hole 22 and includes a relatively small opening area; and a step part 28 which is arranged between the enlarged part 26 and the reduction part 27, and forms a step to an inner wall for specifying the housing hole 22. The manufacturing method of battery pack includes: a step of applying an adhesive agent 41 to a surface 31a of the battery cell 31; and a step for inserting the battery cell 31 to which the adhesive agent 41 is applied into the housing hole 22 from the side of enlarged part 26.SELECTED DRAWING: Figure 4

Description

  The present invention generally relates to a method of manufacturing an assembled battery, and more specifically, to a method of manufacturing an assembled battery including a block in which an accommodation hole is formed and a battery cell accommodated in the accommodation hole.

  Regarding a conventional method of manufacturing a battery pack, for example, in Japanese Patent Application Laid-Open No. 2002-170533, the curved surface of a spacer is brought into close contact with the surface of a cylindrical battery, and the spacer and the cylindrical battery are positioned with high accuracy. A method of manufacturing a battery pack is disclosed that aims to fix accurately without shifting the relative position and to reduce leakage of adhesive (Patent Document 1).

  In the battery pack manufacturing method disclosed in Patent Document 1, spacers having curved surfaces along the surface of the cylindrical battery are disposed between the cylindrical batteries arranged close to each other in parallel. The curved surface of the spacer is fixed to the surface of the cylindrical battery with an adhesive.

  In addition, JP2013-196810A (Patent Document 2), JP2006-100148A (Patent Document 3), JP2008-166208A (Patent Document 4), JP2006-100146A ( Patent Document 5), Japanese Patent Application Laid-Open No. 2003-123715 (Patent Document 6), Japanese Patent Application Laid-Open No. 2003-59470 (Patent Document 7), Japanese Patent Application Laid-Open No. 2001-210295 (Patent Document 8), and Japanese Patent Application Laid-Open No. 2013-131453. The publication (Patent Document 9) also discloses various assembled batteries manufactured by combining cylindrical battery cells.

JP 2002-170533 A JP2013-196810A JP 2006-100148 A JP 2008-166208 A JP 2006-100146 A JP 2003-123715 A JP 2003-59470 A JP 2001-210295 A JP 2013-131453 A

  As disclosed in the above-mentioned patent document, a method of manufacturing an assembled battery by combining a plurality of battery cells is known.

  Here, assuming that a battery pack is manufactured by inserting a battery cell whose surface is coated with an adhesive into a housing hole formed in the block, the battery cell cannot be fully inserted between the battery cell and the inner wall of the housing hole. The battery cell is inserted in a state where the adhesive is collected around the opening of the accommodation hole. At this time, an air layer may be formed between the adhesive and the inner wall of the accommodation hole by pulling the adhesive in the insertion direction of the battery cell inside the accommodation hole. In this case, the battery cell may not be reliably fixed by the adhesive inside the accommodation hole, and there is a possibility that the battery cell may rattle.

  Accordingly, an object of the present invention is to solve the above-described problem and to provide a method for manufacturing an assembled battery that suppresses shakiness of the battery cell inside the accommodation hole.

  The method for manufacturing an assembled battery according to the present invention is a method for manufacturing an assembled battery including a block in which an accommodation hole is formed and a battery cell accommodated in the accommodation hole. The housing hole is provided with an enlarged portion having a relatively large opening area, a reduced portion having a relatively small opening area, and an enlarged portion and a reduced portion provided in parallel with the enlarged portion in the insertion direction of the battery cell with respect to the housing hole. And a step portion that forms a step on the inner wall that defines the accommodation hole. The method for manufacturing an assembled battery includes a step of applying an adhesive to the surface of the battery cell, and a step of inserting the battery cell to which the adhesive is applied into the accommodation hole from the enlarged portion side.

  According to the assembled battery manufacturing method configured as described above, when the battery cell is inserted into the accommodation hole, the adhesive applied to the surface of the battery cell is accumulated in the enlarged portion on the stepped portion. Thereby, since the distance by which the adhesive is pulled in the insertion direction of the battery cell is shortened along with the insertion of the battery cell, an air layer is hardly formed between the adhesive and the inner wall of the accommodation hole. As a result, the adhesiveness between the battery cell and the inner wall of the accommodation hole can be increased by the adhesive, and the rattling of the battery cell inside the accommodation hole can be suppressed.

  Preferably, the battery cell includes a battery main body and an exterior film that covers the battery main body. The exterior film is formed with a notch that exposes the battery body. The notch portion is provided at a position including the step portion in a state where the battery cell is accommodated in the accommodation hole.

  According to the assembled battery manufacturing method configured in this manner, the adhesive accumulated in the enlarged portion on the stepped portion is disposed in the cutout portion, so that the battery main body portion in the exterior film is placed on the inner wall of the accommodation hole. Glued. Thereby, since it becomes difficult for a battery main-body part to raise | generate a position shift within an exterior film, the shakiness of a battery cell can be suppressed more effectively.

  As described above, according to the present invention, it is possible to provide a method for manufacturing an assembled battery that suppresses shakiness of the battery cell inside the accommodation hole.

It is a perspective view which shows 1 process of the manufacturing method of the assembled battery in Embodiment 1 of this invention. It is sectional drawing of the assembled battery corresponding to the position along the II-II line in FIG. It is a figure which shows the process of the manufacturing method of the assembled battery in Embodiment 1 of this invention. It is a figure which shows the next process of the manufacturing method of the assembled battery in Embodiment 1 of this invention. It is a figure which shows the process of the manufacturing method of the assembled battery for a comparison. It is a figure which shows the next process of the manufacturing method of the assembled battery for a comparison. It is a figure which shows the process of the manufacturing method of the assembled battery in Embodiment 2 of this invention. It is a figure for demonstrating the positional relationship of a notch part and a level | step difference part. It is another figure for demonstrating the positional relationship of a notch part and a level | step difference part.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

(Embodiment 1)
1 is a perspective view showing one step of a method for manufacturing an assembled battery according to Embodiment 1 of the present invention. Referring to FIG. 1, an assembled battery 10 manufactured using the method for manufacturing an assembled battery in the present embodiment includes, as a representative example, an internal combustion engine such as a gasoline engine or a diesel engine, and a motor as a power source. It will be installed in a hybrid vehicle with The assembled battery 10 is used as a power source for supplying power to the motor.

  First, the structure of the assembled battery 10 will be described. The assembled battery 10 includes a plurality of battery cells 31 and a block 21 for integrally holding the plurality of battery cells 31. The assembled battery 10 is a high-voltage power source by electrically connecting a plurality of battery cells 31 in series.

  The battery cell 31 is, for example, a lithium ion battery. The battery cell 31 is a so-called cylindrical battery and has a cylindrical appearance.

  The block 21 is made of metal. The block 21 is made of, for example, aluminum. The block 21 has a rectangular parallelepiped shape. The block 21 has a plurality of side surfaces. The side surface of the block 21 when viewed from the insertion direction of the battery cell 31 described later has the largest area among the plurality of side surfaces.

  FIG. 2 is a cross-sectional view of the assembled battery corresponding to the position along the line II-II in FIG. With reference to FIGS. 1 and 2, a plurality of receiving holes 22 are formed in the block 21. The plurality of battery cells 31 are housed in the plurality of housing holes 22, respectively.

  The battery cell 31 is inserted into the accommodation hole 22 in the direction indicated by the arrow 101 in FIG. 1 (hereinafter, the direction indicated by the arrow 101 in FIG. 1 is also referred to as “the insertion direction of the battery cell 31”). The accommodation hole 22 is provided so as to penetrate the block 21 in the insertion direction of the battery cell 31. The block 21 has a top surface 21a and a bottom surface 21b disposed on the back side of the top surface 21a. The accommodation hole 22 penetrates the block 21 and is provided so as to open to the top surface 21a and the bottom surface 21b. The plurality of receiving holes 22 are provided side by side in a plane when the block 21 is viewed from the insertion direction of the battery cell 31.

  The accommodation hole 22 includes an enlarged portion 26, a reduced portion 27, and a stepped portion 28 as its constituent parts. The enlarged portion 26 and the reduced portion 27 are provided side by side in the insertion direction of the battery cell 31. The enlarged portion 26 opens on the top surface 21a, and the reduced portion 27 opens on the bottom surface 21b.

  The enlarged portion 26 and the reduced portion 27 have a cylindrical opening shape extending along a common central axis 110. When the block 21 is cut by a plane orthogonal to the insertion direction of the battery cell 31, the enlarged portion 26 and the reduced portion 27 have a circular opening cross section. The enlarged portion 26 has a relatively large opening area, and the reducing portion 27 has a relatively small opening area.

  The step portion 28 is provided between the enlarged portion 26 and the reduced portion 27. The step portion 28 forms a step on the inner wall that defines the accommodation hole 22. The step portion 28 is configured by an inner wall of the accommodation hole 22 that faces the enlarged portion 26 in the axial direction of the central shaft 110 and circulates in a belt shape around the central shaft 110.

  The battery cell 31 has an insertion end 31p as its constituent part. The insertion end 31p is provided at one end of the cylindrical appearance of the battery cell 31. The battery cell 31 is accommodated in the accommodation hole 22 so that the insertion end 31p is aligned with the bottom surface 21b of the block 21.

  The battery cell 31 is fixed inside the accommodation hole 22 with an adhesive 41. The adhesive 41 is provided in a gap between the inner wall of the accommodation hole 22 and the surface 31 a of the battery cell 31. The adhesive 41 is provided in a portion extending between the enlarged portion 26 and the reduced portion 27 in the axial direction of the central shaft 110. The adhesive 41 is provided from the position of the enlarged portion 26 spaced from the top surface 21a to the position of the reduced portion 27 spaced from the bottom surface 21b in the axial direction of the central axis 110.

  The battery cell 31 includes a battery main body 34 and a halon tube 32. The battery body 34 is configured by accommodating an electrode body together with an electrolytic solution in a cylindrical case body. The electrode body is formed by winding a laminate composed of a positive electrode sheet coated with a paste containing a positive electrode active material, a negative electrode sheet coated with a paste containing a negative electrode active material, and a separator interposed between the positive electrode sheet and the negative electrode sheet. It is configured to be turned.

  The halon tube 32 is provided as an exterior film that covers the surface of the battery body 34. The halon tube 32 is formed of a thin film heat shrinkable tube that covers the cylindrical surface of the battery main body 34.

  Then, the process of manufacturing the assembled battery 10 using the manufacturing method of the assembled battery in this Embodiment is demonstrated. 3 and 4 are diagrams showing steps of the assembled battery manufacturing method according to Embodiment 1 of the present invention.

  With reference to FIG. 3, an adhesive 41 is applied to the surface 31 a of the battery cell 31. In the present embodiment, the adhesive 41 is applied in a strip shape along the circumferential direction of the surface 31 a of the battery cell 31. The adhesive 41 is applied to a position adjacent to the insertion end 31p in the axial direction of the battery cell 31 having a cylindrical appearance.

  Next, referring to FIG. 4, the battery cell 31 to which the adhesive 41 is applied is inserted into the accommodation hole 22 from the enlarged portion 26 side of the enlarged portion 26 and the reduced portion 27. Referring to FIG. 2, the battery cell 31 is fixed in the accommodation hole 22 by curing the adhesive 41.

  Then, the effect produced by the method for manufacturing an assembled battery in the present embodiment will be described with reference to a comparative example.

  FIG. 5 and FIG. 6 are diagrams showing the steps of a method for manufacturing an assembled battery for comparison. FIGS. 5 and 6 show processes corresponding to FIGS. 4 and 2, respectively.

  With reference to FIG. 5 and FIG. 6, in this comparative example, the step portion 28 is not provided in the accommodation hole 22 as compared with the block 21 in FIG. 2.

  In this case, in a state where the adhesive 41 that does not fit between the surface 31a of the battery cell 31 and the inner wall of the accommodation hole 22 is accumulated around the opening of the accommodation hole 22 in the top surface 21a of the block 21, 31 is inserted into the receiving hole 22. At this time, the adhesive 41 is pulled in the insertion direction of the battery cell 31 inside the accommodation hole 22, whereby an air layer is formed between the adhesive 41 and the inner wall of the accommodation hole 22. As a result, the adhesive 41 cannot be brought into close contact with the inner wall of the accommodation hole 22.

  4 and 2, on the other hand, in the assembled battery manufacturing method according to the present embodiment, the step portion 28 is provided in the accommodation hole 22, so that the battery cell 31 is inserted into the accommodation hole 22. The adhesive 41 is caught by the step portion 28, and an adhesive pool is generated in the enlarged portion 26 on the step portion 28. Thereby, the distance by which the adhesive 41 is pulled in the insertion direction of the battery cell 31 with the insertion of the battery cell 31 is shortened (H1 in FIG. 2 <H2 in FIG. 6). It is difficult to form an air layer between the inner wall and the inner wall. As a result, the adhesiveness between the battery cell 31 and the inner wall of the accommodation hole 22 by the adhesive 41 can be improved, and rattling of the battery cell 31 inside the accommodation hole 22 can be prevented.

  The method for manufacturing an assembled battery according to Embodiment 1 of the present invention described above manufactures the assembled battery 10 including the block 21 in which the accommodation hole 22 is formed and the battery cell 31 accommodated in the accommodation hole 22. Is the method. The housing hole 22 is provided with an enlarged portion 26 having a relatively large opening area, and a reducing portion 27 provided side by side with the enlarged portion 26 in the insertion direction of the battery cell 31 with respect to the housing hole 22 and having a relatively small opening area. And a step portion 28 provided between the enlarged portion 26 and the reduced portion 27 and forming a step on the inner wall defining the accommodation hole 22. The method for manufacturing an assembled battery includes a step of applying an adhesive 41 to the surface 31a of the battery cell 31, and a step of inserting the battery cell 31 to which the adhesive 41 has been applied into the accommodation hole 22 from the enlarged portion 26 side. Prepare.

  According to the assembled battery manufacturing method in Embodiment 1 of the present invention configured as described above, the stepped portion 28 is provided in the accommodation hole 22, and the battery cell 31 to which the adhesive 41 is applied is attached to the enlarged portion 26. By inserting into the accommodation hole 22 from the side, rattling of the battery cell 31 inside the accommodation hole 22 can be suppressed.

(Embodiment 2)
FIG. 7 is a diagram showing a process of the assembled battery manufacturing method according to Embodiment 2 of the present invention. The method for manufacturing an assembled battery in the present embodiment basically has the same configuration as that of the method for manufacturing an assembled battery in the first embodiment. Hereinafter, the description of the overlapping configuration will not be repeated.

  Referring to FIG. 7, the notch 33 is formed in the halon tube 32. The notch 33 is formed so as to partially expose the cylindrical surface of the battery main body 34 covered with the halon tube 32. In the present embodiment, a plurality of cutout portions 33 having a rectangular shape are provided side by side in the circumferential direction.

  The notch 33 is provided at a position including the stepped portion 28 in a state where the battery cell 31 shown in FIG. 7 is accommodated in the accommodation hole 22. That is, the notch 33 is provided at a position overlapping the step portion 28 in the axial direction of the central shaft 110.

  In the present embodiment, during the step of applying the adhesive 41 to the surface 31a of the battery cell 31, the adhesive 41 is formed between the insertion end 31p and the notch 33 in the axial direction of the battery cell 31 having a cylindrical appearance. Apply between. The adhesive 41 is applied to a position closer to the notch 33 than the insertion end 31p in the axial direction of the battery cell 31 having a cylindrical appearance.

  According to the method for manufacturing an assembled battery in the present embodiment, the battery main body 34 in the halon tube 32 can be bonded to the inner wall of the accommodation hole 22 by the notch 33 formed in the halon tube 32. Thereby, the battery main body part 34 can be prevented from moving in the halon tube 32 and falling off from the halon tube 32, and rattling of the battery cell 31 can be more effectively prevented.

  8 and 9 are diagrams for explaining the positional relationship between the notch and the stepped portion. Referring to FIGS. 8 and 9, when notch 33 is at a position higher than stepped portion 28 (FIG. 8), or when notch 33 is at a position lower than stepped portion 28 (FIG. 9). Depending on the position where the adhesive 41 is provided, the notch 33 is disposed away from the adhesive 41.

  Referring to FIG. 7, on the other hand, in the present embodiment, the notch 33 is provided at a position including the stepped portion 28, so that the adhesive reservoir formed in the enlarged portion 26 on the stepped portion 28 is notched. It can be arranged in the part 33. Thereby, the battery main body 34 can be bonded to the inner wall of the accommodation hole 22 by the adhesive 41 arranged in the notch 33.

  According to the assembled battery manufacturing method in the second embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is applied to manufacture of an assembled battery configured by combining a plurality of battery cells.

  10 battery packs, 21 blocks, 21a top surface, 21b bottom surface, 22 receiving hole, 26 enlarged portion, 27 reduced portion, 28 stepped portion, 31 battery cell, 31a surface, 31p insertion end, 32 halon tube, 33 cutout portion, 34 Battery body, 41 Adhesive.

Claims (2)

A method of manufacturing an assembled battery comprising a block in which an accommodation hole is formed and a battery cell accommodated in the accommodation hole,
The housing hole is provided with an enlarged portion having a relatively large opening area, a reduced portion having a relatively small opening area provided side by side with the enlarged portion in the insertion direction of the battery cell with respect to the housing hole, A step portion provided between the enlarged portion and the reduced portion, and forming a step on an inner wall defining the accommodation hole;
Applying an adhesive to the surface of the battery cell;
Inserting the battery cell coated with the adhesive into the accommodation hole from the side of the enlarged portion. The battery cell has a battery main body and an exterior film that covers the battery main body,
The exterior film is formed with a notch that exposes the battery body.
The assembled battery manufacturing method according to claim 1, wherein the notch is provided at a position including the stepped portion in a state where the battery cell is accommodated in the accommodation hole.

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