JP6217983B2 - Battery module and manufacturing method thereof - Google Patents

Description

  The present invention relates to a battery module including a battery cell and a holder for holding the battery cell, and a manufacturing method thereof.

  In general, the battery cell in the battery module is bonded to a holder. For example, the battery module introduced in Patent Document 1 is formed by integrally bonding a plurality of battery cells to a holder. This type of battery module is also called an assembled battery, and is used for various applications such as a vehicle battery.

  In the battery module introduced in Patent Document 1, the holder is provided with a battery holding part having a hole shape, and the battery cell is inserted into the battery holding part. And an adhesive agent is inject | poured between the internal peripheral surface of the battery holding part in a holder, and the outer peripheral surface of a battery cell, and the adhesive layer is formed by solidifying this adhesive agent. However, according to the method of injecting the adhesive between the inner peripheral surface of the battery holding part and the outer peripheral surface of the battery cell (so-called potting method), it takes time to inject and solidify the adhesive, resulting in poor working efficiency. .

  In order to improve the working efficiency, for example, a method of applying an adhesive to the outer peripheral surface of the battery cell and inserting the battery cell in a state where the adhesive is applied into the battery holding part is conceivable.

  By the way, in order to stably hold the battery cell in the holder, it is considered that the gap between the inner peripheral surface of the battery holding portion provided in the holder and the outer peripheral surface of the battery cell should not be so large. In this case, it is necessary to fill the adhesive in a narrow gap. However, since the adhesive has a relatively high viscosity, the frictional resistance with the inner peripheral surface of the battery holding portion is relatively large, and it is difficult to spread it uniformly. For this reason, it was not easy to spread the adhesive uniformly in a narrow gap between the inner peripheral surface of the battery holding portion and the outer peripheral surface of the battery cell. When the adhesive does not reach the gap between the inner peripheral surface of the battery holding portion and the outer peripheral surface of the battery cell, and air is caught inside the adhesive layer, the adhesive and the counterpart material (that is, the inner peripheral surface of the battery holding portion) And / or the outer peripheral surface of the battery cell) may be reduced, or the strength of the adhesive itself may be reduced. For this reason, according to the manufacturing method of such a battery module, there existed a problem that it was difficult to improve adhesive strength and it was difficult to adhere | attach and integrate a battery cell stably to a holder.

JP 2013-8655 A

  The present invention has been made in view of the above circumstances, and provides a battery module in which an adhesive is sufficiently filled between a battery holding portion of a holder and a battery cell, and a method for manufacturing the battery module. The purpose is to do.

(1) One of the battery module manufacturing methods of the present invention that solves the above problems is
A preparation step of preparing a holder and a battery cell having a battery holding portion in the form of a hole, a coating step of applying an adhesive to at least the outer peripheral surface of the battery cell, and the battery cell on the battery holding portion of the holder An insertion step of inserting,
The battery holding part comprises a general part and a holder pool part having a larger diameter than the general part and constituting an insertion start end in the battery holding part,
In the coating step,
In the first region, which is at least a partial region in the axial direction on the outer peripheral surface of the battery cell, the first adhesive is applied over the entire outer periphery of the battery cell to form a cylindrical first adhesive layer And
A second adhesive having a viscosity lower than that of the first adhesive is positioned on the outer peripheral surface of the battery cell on the front side of the battery cell in the insertion direction of the battery cell and adjacent to the first region. It is the method of apply | coating over the perimeter of at least one of an area | region and the 3rd area | region including the said holder pool part in the said holder, and forming a cylindrical 2nd adhesive bond layer.

(2) Another one of the battery module manufacturing methods of the present invention that solves the above problems is
A preparation step of preparing a holder and a battery cell having a battery holding portion in the form of a hole, a coating step of applying an adhesive to at least the outer peripheral surface of the battery cell, and the battery cell on the battery holding portion of the holder An insertion step of inserting,
In the coating step,
In the first region, which is at least a partial region in the axial direction on the outer peripheral surface of the battery cell, the first adhesive is applied over the entire outer periphery of the battery cell to form a cylindrical first adhesive layer And
A second adhesive having a viscosity lower than that of the first adhesive is positioned on the outer peripheral surface of the battery cell on the front side of the battery cell in the insertion direction of the battery cell and adjacent to the first region. Coating the entire circumference of at least one of the region and the third region including the insertion start end of the battery holding portion of the holder to form a cylindrical second adhesive layer;
The first adhesive layer is composed of a general adhesive portion and an adhesive pool portion that is continuous with the general adhesive portion and is located on the front side in the battery cell insertion direction with respect to the general adhesive portion and has a larger hole diameter than the general adhesive portion. And a method comprising:

(3) Another method of manufacturing the battery module of the present invention that solves the above-described problems is as follows.
A preparation step of preparing a holder and a battery cell having a battery holding portion in the form of a hole, a coating step of applying an adhesive to at least the outer peripheral surface of the battery cell, and the battery cell on the battery holding portion of the holder An insertion step of inserting,
The battery holding portion is formed in a tapered hole shape in which the hole diameter gradually increases toward the insertion start end portion in the battery holding portion,
In the coating step,
In the first region, which is at least a partial region in the axial direction on the outer peripheral surface of the battery cell, the first adhesive is applied over the entire outer periphery of the battery cell to form a cylindrical first adhesive layer And
A second adhesive having a viscosity lower than that of the first adhesive is positioned on the outer peripheral surface of the battery cell on the front side of the battery cell in the insertion direction of the battery cell and adjacent to the first region. Coating the entire circumference of at least one of the region and the third region including the insertion start end of the holder to form a cylindrical second adhesive layer;
In this method, the outer diameter of the first adhesive layer is provided larger than the outer diameter of the second adhesive layer and larger than the hole diameter of the insertion start end portion in the battery holding portion.

  The method for producing a battery module according to (1) or (2) preferably includes the following (4) and / or (5).

  (4) In the coating step, the outer diameter of the first adhesive layer is larger than the hole diameter of the battery holding part.

  (5) In the application step, the outer diameter of the first adhesive layer is larger than the outer diameter of the second adhesive layer.

(6) One of the battery modules of the present invention that solves the above problems is
Manufactured by the manufacturing method of (1) above,
A holder having a hole-shaped battery holding portion, a battery cell at least partially inserted in the battery holding portion, and an adhesive layer formed between the battery holding portion and the outer peripheral surface of the battery cell And
The battery holding part is composed of a general part and a holder pool part having a larger diameter than the general part and constituting an insertion start end part in the battery holding part,
At least a part of the adhesive layer in the axial direction is formed of the first adhesive and is in contact with the outer peripheral surface of the battery cell. The outer periphery of the first adhesive layer is formed of the second adhesive. And a second adhesive layer in contact with the battery holding portion.

(7) Another one of the battery modules of the present invention that solves the above problems is
Manufactured by the manufacturing method of (3) above,
A holder having a hole-shaped battery holding portion, a battery cell at least partially inserted in the battery holding portion, and an adhesive layer formed between the battery holding portion and the outer peripheral surface of the battery cell And
The battery holding part has a tapered hole shape in which the hole diameter gradually increases toward the insertion start end of the battery cell,
At least a part of the adhesive layer in the axial direction is formed of the first adhesive and is in contact with the outer peripheral surface of the battery cell. The outer periphery of the first adhesive layer is formed of the second adhesive. And a second adhesive layer in contact with the battery holding portion.

  According to the battery module manufacturing method of the present invention, the adhesive can be sufficiently filled between the battery holding portion of the holder and the battery cell. In the battery module of the present invention, an adhesive is sufficiently filled between the battery holding portion of the holder and the battery cell, and the battery cell is held in the holder with high adhesiveness.

3 is a perspective view schematically illustrating a battery module of Example 1. FIG. 2 is an exploded perspective view schematically showing the battery module of Example 1. FIG. It is sectional drawing which represents typically a mode that the battery module of Example 1 was cut | disconnected in the XX position in FIG. 6 is an explanatory diagram schematically showing an insertion step in the manufacturing method of Example 1. FIG. It is explanatory drawing which represents typically the insertion process in the manufacturing method of a reference example. 6 is an explanatory diagram schematically showing an insertion step in the manufacturing method of Example 2. FIG. 10 is an explanatory diagram schematically showing an insertion step in the manufacturing method of Example 3. FIG. 6 is an explanatory diagram schematically showing an insertion step in the manufacturing method of Example 4. FIG.

  Hereinafter, the manufacturing method of the battery module of the present invention will be described with specific examples. Hereinafter, the manufacturing method of the battery module of the present invention is simply abbreviated as the manufacturing method of the present invention as necessary. Moreover, the manufacturing method of the battery module of each Example is simply abbreviated as the manufacturing method of each Example as needed.

Example 1
1 is a perspective view schematically showing a battery module of Example 1. FIG. FIG. 2 is an exploded perspective view of the battery module of Example 1 shown in FIG. FIG. 3 is a cross-sectional view schematically showing a state where the battery module of Example 1 is cut at the position XX in FIG. 1. 4 is an explanatory view schematically showing an insertion step in the method for manufacturing the battery module of Example 1. FIG. FIG. 5 is an explanatory view schematically showing an insertion step in the battery module manufacturing method of the reference example. Hereinafter, in the embodiments, the terms “up”, “down”, “left”, “right”, “front”, and “rear” refer to “upper, lower, left, right, front, and rear” shown in FIG. In the examples, the axial direction Y of the battery cell refers to the vertical direction shown in FIG. In addition, the axial direction Y in members other than a battery cell refers to the direction which corresponds to the axial direction Y in the assembly | attachment state shown in FIG. Further, hereinafter, the insertion direction of the battery cell refers to a direction coinciding with the axial direction Y, the front side in the insertion direction is the upper side shown in FIG. 1, and the rear side in the insertion direction is the lower side shown in FIG. It is.

<Production method of battery module>
The battery module manufacturing method of Example 1 is a method of manufacturing a battery module having the battery cell 1, the adhesive layer 84, and the holder 5 (see FIGS. 1 and 2).

  Each battery cell 1 is inserted into a through-hole battery holder 50 provided in the holder 5. As shown in FIG. 3, the adhesive layer 84 is a layer formed by solidifying an adhesive layer 4 described later, and is interposed between the inner peripheral surface of the battery holding unit 50 and the outer peripheral surface 11 of the battery cell 1. And fix them together. In Example 1, it interposes between the inner peripheral surface 50v of the general part 50a and the outer peripheral surface 11 of the battery cell 1 in the battery holding part 50, and fixes both. The manufacturing method of the battery module of Example 1 includes a preparation process, a coating process, and an insertion process.

(Preparation process)
In the preparation step, the battery cell 1 and the holder 5 described above were prepared. As shown in FIGS. 1 and 2, the battery cell 1 has a substantially cylindrical shape, and the battery holding portion 50 of the holder 5 has a through-hole shape slightly larger in diameter than the battery cell 1.

  As shown in FIG. 3, in Example 1, the battery holding part 50 is comprised by the general part 50a and the holder pool part 50b. The holder pool part 50 b constitutes an insertion start end part 5 x in the battery holding part 50. The insertion start end 5x serves as a start end when the battery cell 1 is inserted into the holder 5. Further, the insertion start end 5x can be said to be an end located on the rear side in the insertion direction of the holder 5.

  The general part 50a is a part other than the holder pool part 50b in the battery holding part 50, and the general part 50a and the holder pool part 50b are continuous in the axial direction Y. The holder pool part 50b has a larger diameter than the general part 50a, and the general part 50a and the holder pool part 50b communicate with each other in a stepped shape. In addition, the holder pool part 50b should just be a larger diameter than the general part 50a, and the magnitude | size and shape are not specifically limited.

  In Example 1, the inner diameter difference between the general portion 50a and the holder pool portion 50b was 0.4 mm. The inner diameter difference between the general portion 50a and the holder pool portion 50b may be appropriately set according to the amount of the second adhesive to be put into the bonding space 20 described later, and is not particularly limited, but is 0.1 mm or more. Is preferable, and 0.4 mm or more is more preferable. The upper limit value of the inner diameter difference is not particularly limited, but is preferably 2 mm or less. If the inner diameter difference is excessive, the second adhesive may easily escape in the planar direction, that is, the outer peripheral side direction of the holder pool portion 50b, and the second adhesive may be difficult to enter the bonding space 20.

(Coating process)
As the adhesive, two types of adhesives having different viscosities were used. Of the two types of adhesives, one having a high viscosity is called a first adhesive, and one having a low viscosity is called a second adhesive.

  As shown in the left part of FIG. 4, in the coating process in the manufacturing method of Example 1, the first adhesive layer 41 and the second adhesive layer 45 were applied and formed on the outer peripheral surface 11 of the battery cell 1. The first adhesive and the second adhesive have already been described. In the manufacturing method of Example 1, the first adhesive is applied to the first region I of the battery cell 1 to form the first adhesive layer 41, and the second adhesive is applied to the second region II of the battery cell 1. The second adhesive layer 45 was formed by coating.

  The first region I and the second region II are partial regions in the axial direction Y on the outer peripheral surface 11 of the battery cell 1, and are different regions adjacent to each other. More specifically, the second region II is an end region located on the front side in the insertion direction with respect to the first region I, the first region I is adjacent to the second region II, and is more than the second region II. This is an area located on the rear side in the insertion direction.

  In the application step, the first adhesive layer 41 having a cylindrical shape or a substantially cylindrical shape is formed on the outer peripheral surface 11 of the battery cell 1 by applying the first adhesive over the entire circumference of the first region I in the battery cell 1. did. Further, the second adhesive layer 45 having a cylindrical shape or a substantially cylindrical shape was formed on the outer peripheral surface 11 of the battery cell 1 by applying the second adhesive over the entire circumference of the second region II in the battery cell 1. In the manufacturing method of Example 1, the first adhesive layer 41 was first formed and then the second adhesive layer 45 was formed, but the formation order of the first adhesive layer 41 and the second adhesive layer 45 was particularly It is not limited. Moreover, the 1st adhesive bond layer 41 and the 2nd adhesive bond layer 45 may overlap in a mutual boundary part. In this case, it is preferable to form the first adhesive layer 41 first and then form the second adhesive layer 45.

  In the coating step, the coating thickness of the first adhesive, that is, the thickness of the first adhesive layer 41 was about 0.3 to 2.0 mm. On the other hand, the application thickness of the second adhesive, that is, the thickness of the second adhesive layer 45 was about 0.3 to 1.5 mm. The outer diameter of the second adhesive layer 45 is preferably larger than the inner peripheral surface 50v of the general part 50a in the battery holding part 50. This is because the second adhesive is stored in the holder pool portion 50b.

  In Example 1, the thickness of the first adhesive layer 41 was thicker than the thickness of the second adhesive layer 45, but depending on the case, the thickness of the first adhesive layer 41 and the thickness of the second adhesive layer 45 may be used. Sato may be the same. Further, the maximum thickness of the second adhesive layer 45 may be larger than the hole diameter of the holder pool portion 50b.

  The thickness of the 1st adhesive bond layer 41 was larger than the distance of the outer peripheral surface 11 of the battery cell 1 in a battery module, and the inner peripheral surface 50w of the holder pool part 50b. On the other hand, the thickness of the 2nd adhesive bond layer 45 is larger than the distance of the outer peripheral surface 11 of the battery cell 1 in a battery module, and the inner peripheral surface 50v of the general part 50a, and the outer peripheral surface 11 of the battery cell 1 in a battery module. It was slightly larger than the distance from the inner peripheral surface 50w of the holder pool portion 50b. In other words, the outer diameter of the first adhesive layer 41 was larger than the hole diameter of the general part 50a and the hole diameter of the holder pool part 50b. And the outer diameter of the 2nd adhesive bond layer 45 was a little larger than the hole diameter of the holder pool part 50b, and larger than the hole diameter of the general part 50a. Furthermore, the inner diameter of the first adhesive layer 41 and the inner diameter of the second adhesive layer 45 substantially coincided with the outer diameter of the battery cell 1 and were smaller than the hole diameter of the general portion 50a.

  Here, “the thickness of the first adhesive layer 41” and “the thickness of the second adhesive layer 45” refer to the minimum values of the respective thicknesses. The “distance between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 50v of the general portion 50a” refers to the distance between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 50v of the general portion 50a in the battery module. More specifically, the distance between the portion of the inner peripheral surface 50v of the general portion 50a closest to the insertion start end portion 5x (see FIG. 4) of the holder 5 and the outer peripheral surface 11 of the battery cell 1 is indicated. Furthermore, "the distance between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 50w of the holder pool portion 50b" refers to the distance between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 50w of the holder pool portion 50b in the battery module. More specifically, the distance between the portion of the inner peripheral surface 50 w of the holder pool portion 50 b closest to the insertion start end portion 5 x of the holder 5 and the outer peripheral surface 11 of the battery cell 1 is indicated.

(Insertion process)
After the application step described above, the battery cell 1 on which the first adhesive layer 41 and the second adhesive layer 45 are formed is aligned with the battery holding unit 50 of the holder 5, and the battery cell 1 is attached to the battery holding unit 50. Inserted.

  Specifically, as shown in the left part of FIG. 4, the battery cell 1 is inserted into the battery holding unit 50 by moving the battery cell 1 along the axial direction Y with respect to the fixed holder 5. At this time, the battery cell 1 moved relative to the holder 5 from the lower side to the upper side in FIG.

  As described above, the first adhesive layer 41 and the second adhesive layer 45 are provided on the outer peripheral surface 11 of the battery cell 1. And the 2nd adhesive bond layer 45 is adjacent to the 1st adhesive bond layer 41, and is located in the front side of the insertion direction of the battery cell 1. FIG. Furthermore, the thickness of the second adhesive layer 45 is larger than the length in the radial direction of the bonding space 20 (that is, the distance between the inner peripheral surface 50v of the general portion 50a and the outer peripheral surface 11 of the battery cell 1). Therefore, as shown in the second part from the left in FIG. 4, when the battery cell 1 is inserted into the battery holding part 50, the second adhesive layer 45 first enters the holder pool part 50 b. Next, the second adhesive layer 45 is pressed against the bottom surface 50x and the inner peripheral surface 50w of the holder pool portion 50b by being pressed by the first adhesive layer 41, and the bottom surface 50x and the inner periphery of the holder pool portion 50b by reaction force. It is pressed against the surface 50 w and pressed against the first adhesive layer 41. The viscosity of the first adhesive layer 41 made of the first adhesive is higher than the viscosity of the second adhesive layer 45 made of the second adhesive, and the first adhesive layer 41 is compared with the second adhesive layer 45. Difficult to deform. Therefore, as shown in the third part from the left in FIG. 4, at this time, the second adhesive layer 45 is pressed by the first adhesive layer 41 and greatly deformed, and is filled in the adhesive space 20.

  In other words, when the battery cell 1 is inserted into the battery holding unit 50, the first adhesive layer 41 and the second adhesive layer 45 are in pressure contact, and the first adhesive layer 41 and the second adhesive layer 45 are The second adhesive layer 45 is deformed relative to the first adhesive layer 41 at the boundary surface. Therefore, the second adhesive layer 45 functions as a filler filled between the inner peripheral surface 50v of the general portion 50a and the outer peripheral surface 41a of the first adhesive layer 41, and the first adhesive layer 41 is the first adhesive layer 41. 2 Functions as a pressing material for spreading the adhesive layer 45. Further, the second adhesive layer 45 also functions as a lubricant for the first adhesive layer 41, and the first adhesive layer 41 also functions as a filler. Therefore, as shown in the right part of FIG. 4, after the insertion step, the adhesive layer 84 composed of the first adhesive layer 81 and the second adhesive layer 85 is between the general part 50 a and the battery cell 1. The provided bonding space 20 is filled without a gap. Note that the bonding space 20 may be formed only in a part of the battery module 50 in the axial direction Y of the battery module, or may be formed in the entire length in the axial direction Y. The axial length of the bonding space 20 is appropriately set according to the bonding strength required for the battery module.

  Basically, the deformation amount of the first adhesive layer 41 gradually increases from the rear side in the insertion direction (lower side in FIG. 1) toward the front side in the insertion direction (upper side in FIG. 1). This is because the front side portion in the insertion direction of the first adhesive layer 41 receives more reaction force from the second adhesive layer 45 than the rear side portion in the insertion direction. The difference in deformation amount of the first adhesive layer 41 becomes more prominent as the difference in viscosity between the first adhesive layer 41 and the second adhesive layer 45 becomes smaller. On the other hand, if the difference in viscosity between the first adhesive layer 41 and the second adhesive layer 45 is large, the difference in the deformation amount of the first adhesive layer 41 is small, and the thickness of the first adhesive layer 41 is inserted. It is substantially constant from the rear side of the direction to the front side of the insertion direction. In the battery module manufacturing method of Example 1, the difference in viscosity between the first adhesive layer 41 and the second adhesive layer 45 is large. Therefore, the difference in deformation amount of the first adhesive layer 41 is small, the thickness of the first adhesive layer 81 in the adhesive layer 84 is substantially constant, and the thickness of the second adhesive layer 85 is also substantially constant. It is.

  In the battery module manufacturing method according to the first embodiment, substantially the entire second adhesive layer 45 is accommodated in the holder pool portion 50b in the initial stage of the insertion process, and is further guided to the bonding space 20. That is, according to the battery module manufacturing method of the first embodiment, a desired amount of the second adhesive can be put into the bonding space 20, and a sufficiently large area in the bonding space 20 can be filled with the adhesive. .

  Even when the holder pool part 50b is not provided, the adhesive can be filled in the entire circumference of the bonding space 20 in the circumferential direction. However, depending on the case, the filling amount of the second adhesive into the bonding space 20 may be insufficient. In such a case, it is difficult to put a large amount of adhesive into the bonding space 20, and it may be difficult to fill the adhesive over the desired length in the axial direction Y of the bonding space 20. It was. Hereinafter, a specific example will be given and described with reference to FIG.

  FIG. 5 shows that the battery cell 101 provided with the first adhesive layer 141 and the second adhesive layer 145 similar to those of the first embodiment is inserted into the holder 105 in which the hole diameter of the battery holding portion 150 is constant in the axial direction Y. It is explanatory drawing which represents a mode that it is showing. The battery module manufacturing method shown in FIG. 5 is a reference example that does not correspond to the battery module manufacturing method of the present invention, and therefore FIG. 5 is also regarded as a reference diagram.

  The holder 105 shown in FIG. 5 does not have a holder pool part in the battery holding part 150. In this holder 105, the hole diameter of the battery holding part 150 is constant in the axial direction Y. As shown in the left part of FIG. 5, when the battery cell 101 to which the adhesive is applied is inserted into the battery holding portion 150 of the holder 105 like the battery module of Example 1, first, the second adhesive layer 145 contacts the opening end surface 152 of the holder 105.

  As shown in the right part of FIG. 5, at this time, a part of the second adhesive layer 145 that is in contact with the opening end surface 152 is scraped off by the opening end surface 152 or blocked by the opening end surface 152. And remains outside the bonding space 120. That is, at this time, a relatively large portion of the second adhesive layer 145 may remain outside the bonding space 120, and a sufficient amount of the second adhesive layer 145 may not be allowed to enter the bonding space 120. As a result, the second adhesive layer 145 in the bonding space 120 may be depleted on the front side in the insertion direction in the bonding space 120.

  In the region where the second adhesive layer 145 is depleted, only the first adhesive layer 141 exists in the adhesive space 120, and the lubrication effect or the like by the second adhesive layer 145 cannot be obtained. For this reason, it is difficult to fill the bonding space 120 with the first adhesive layer 141 in the region where the second adhesive layer 145 is depleted and on the front side in the insertion direction with respect to the region, and air is trapped inside. There is a possibility that the adhered adhesive layer 84 is formed. In this case, it may be difficult to greatly improve the adhesion strength of the battery cell 101 to the holder 105.

  On the other hand, as shown in FIG. 4, in the battery module manufacturing method of Example 1, when the battery cell 1 in which the first adhesive layer 41 and the second adhesive layer 45 are formed is inserted into the battery holding unit 50. The second adhesive layer 45 first enters the holder pool portion 50b. Since the holder pool part 50b is a part with a large hole diameter in the battery holding part 50, the whole or most part of the second adhesive layer 45 can be accommodated in the holder pool part 50b. Next, the second adhesive layer 45 in the holder pool portion 50 b is pressed toward the front side in the insertion direction in the adhesive space 20 by the first adhesive layer 41. Accordingly, substantially the entire second adhesive layer 45 is filled in the bonding space 20.

  The second adhesive layer 45 also functions as a lubricant for the first adhesive layer 41 as described above. Therefore, the adhesive space 84 is filled with the adhesive layer 84 composed of the first adhesive layer 81 and the second adhesive layer 85 without a gap (or with almost no gap). In addition, since a sufficient amount of the second adhesive layer 45 is inserted in the adhesive space 20, the adhesive layer 84 including the first adhesive layer 84 and the second adhesive layer 85 is arranged in the axial direction Y of the adhesive space 20. A sufficient length is formed. Therefore, in the battery module of Example 1 obtained by the method for manufacturing the battery module of Example 1, the battery cell 1 and the holder 5 are bonded with high strength, and the battery cell 1 is stably bonded to the holder 5.

  In order to insert as much first adhesive layer 41 as possible into the bonding space 20, it is necessary to reduce the amount of the first adhesive layer 41 remaining in the holder pool portion 50b as much as possible. For this purpose, it is preferable that the second adhesive layer 45 functions as a lubricant for the first adhesive layer 41 even in the holder pool portion 50b. Specifically, if the second adhesive layer 45 is first brought into contact with the region where the first adhesive 41 abuts in the holder pool portion 50b, the second adhesive layer 45 attached to the region is first removed. It can function as a lubricant for the adhesive layer 41. The said area | region is the bottom face 50x and the internal peripheral surface 50w of the holder pool part 50b.

  If the second adhesive layer 45 adheres to the bottom surface 50x and the inner peripheral surface 50w of the holder pool portion 50b, the second adhesive layer 45 functions as a lubricant inside the holder pool portion 50b and remains in the holder pool portion 50b. The amount of the first adhesive layer 41 to be reduced can be reduced. Further, the second adhesive layer 45 inside the holder pool portion 50 b is pressed by the first adhesive layer 41 and is pressed into the adhesive space 20 together with the first adhesive layer 41. For this reason, also in this case, the amount of the second adhesive layer 45 remaining in the holder pool portion 50b is sufficiently reduced.

  Thus, in order to adhere the second adhesive layer 45 to the bottom surface 50x and the inner peripheral surface 50w of the holder pool portion 50b, the relationship between the hole diameter of the holder pool portion 50b and the outer diameter of the second adhesive layer 45 is is important. That is, the outer diameter of the second adhesive layer 45 is preferably substantially the same as or larger than the hole diameter of the holder pool portion 50b. Here, the outer diameter of the second adhesive layer 45 may be slightly smaller than the hole diameter of the holder pool portion 50b. This is because the second adhesive layer 45 pressed by the first adhesive layer 41 spreads in the radial direction and may adhere to the bottom surface 50x and the inner peripheral surface 50w of the holder pool portion 50b.

  Specifically, if the outer diameter of the second adhesive layer 45 is set within the range of the hole diameter ± 0.4 mm of the holder pool portion 50b, the amount of the second adhesive layer 45 remaining outside the holder pool portion 50b can be reduced. A sufficient amount of the second adhesive layer 45 can be adhered to the bottom surface 50x and the inner peripheral surface 50w of the holder pool portion 50b while reducing as much as possible. As described above, the outer diameter of the first adhesive layer 41 is preferably larger than the outer diameter of the second adhesive layer 45 and the hole diameter of the holder pool portion 50b, and the size is not particularly limited. 2 It is preferable that the outer diameter of the adhesive layer 45 be 0.2 mm or more. About an upper limit, since a preferable value changes according to the space | interval of the battery holding part 50, etc. in the holder 5, it cannot be said unconditionally. However, if it dares to say, it is good that the difference with the hole diameter of the holder pool part 50b is 1 mm or less. As a preferable range, the outer diameter of the first adhesive layer 41 and the second adhesive layer 45 are assumed on the assumption that the outer diameter of the first adhesive layer 41 is larger than the outer diameter of the second adhesive layer 45. The difference from the outer diameter is preferably 0.2 mm or more and 1 mm or less. Further, on the assumption that the outer diameter of the first adhesive layer 41 is larger than the hole diameter of the holder pool portion 50b, the difference between the outer diameter of the first adhesive layer 41 and the hole diameter of the holder pool portion 50b is 0.1 mm. The thickness is preferably 1 mm or less and more preferably 0.1 mm or more and 0.5 mm or less. The difference between the outer diameter of the first adhesive layer 41 and the hole diameter of the holder pool portion 50b is preferably as small as possible.

  In the manufacturing method of Example 1, the first region I to which the first adhesive is applied and the second region II to which the second adhesive is applied are on the outer peripheral surface 11 of the battery cell 1, and the front side of the battery cell 1. Is exposed. For this reason, the process of apply | coating a 1st adhesive agent and a 2nd adhesive agent is easy. Therefore, according to the manufacturing method of Example 1, a battery module in which the adhesive layer 84 is sufficiently filled between the battery holding portion 50 (more specifically, the general portion 50a) of the holder 5 and the battery cell 1 can be easily obtained. Can be manufactured.

  In the manufacturing method of Example 1, the second region II includes the front end region in the insertion direction on the outer peripheral surface 11 of the battery cell 1, but in the manufacturing method of the present invention, the second region II is The end region may not be included.

  As described above, when the second adhesive layer 45 is formed in the second region II as in the first embodiment, at least the outer diameter of the second adhesive layer 45 is equal to or larger than the hole diameter of the holder pool portion 50b. preferable. In addition, it is more preferable that the outer diameter of the first adhesive layer 41 is larger than the outer diameter of the second adhesive layer 45. In the insertion step described above, the second side as much as possible can be obtained by covering the rear side in the insertion direction of the holder pool portion 50b, that is, the insertion start end portion 5x side of the holder pool portion 50b with the first adhesive layer 41. This is to confine the adhesive layer 45 inside the holder pool portion 50b. More specifically, it is possible if the second adhesive layer 45 is confined in a region defined by the outer peripheral surface 11 of the battery cell 1, the inner peripheral surface 50w of the holder pool portion 50b, and the first adhesive layer 41. As many second adhesive layers 45 as possible can be guided to the bonding space 20.

  By the way, the 1st adhesive bond layer 41 and the 2nd adhesive bond layer 45 should just be two types of adhesive bond layers from which a viscosity differs. Therefore, the type of the first adhesive constituting the first adhesive layer 41, the type of the second adhesive constituting the second adhesive layer 45, and the combination of the first adhesive and the second adhesive are particularly limited. The first adhesive layer 41 may be a combination having a higher viscosity than the second adhesive layer 45. That is, the first adhesive and the second adhesive may be appropriately selected according to the required adhesive strength and the usage environment of the battery module. The adhesive in the present invention is capable of changing the state from a fluid state to a solid state, and when changing the state from a fluid state to a solid state, at least the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface of the battery holding unit 50. It refers to a fixable composition. For example, the adhesive may be in a fluid state at the insertion step, that is, when the battery cell 1 is inserted into the battery holding unit 50. Then, after the battery cell 1 is inserted into the cell fixing step, that is, the battery holding unit 50, the state is changed from a fluid state to a solid state by being cured by a chemical reaction or vaporization of a solvent. What is necessary is just to be able to adhere to the peripheral surface and the outer peripheral surface 11 of the battery cell 1. The fluid state here refers to a state in which the fluid can flow, and is a concept including liquid, gel, sol, slurry, and the like. Specific examples of the adhesive include a reactive adhesive, a solvent adhesive, an emulsion adhesive, a hot melt adhesive, and a synthetic rubber adhesive.

  The viscosity of the adhesive can be adjusted by various methods. For example, the viscosity can be adjusted by appropriately setting the molecular weight of resin constituents such as oligomers and polymers contained in the adhesive. Generally, a low molecular weight resin component has a lower viscosity than a high molecular weight resin component. Or the viscosity of an adhesive agent can also be adjusted by mix | blending various fillers with an adhesive agent. Furthermore, it is possible to adjust the viscosity of the adhesive by appropriately setting the type and amount of the filler. Although depending on the type and particle size of the filler, it is generally said that when a small-diameter filler is used, the viscosity of the adhesive increases as the filler content increases. If the adhesive is a solvent-based adhesive or an emulsion-based adhesive, the viscosity of the adhesive can be adjusted by appropriately adjusting the blending ratio of the solvent and the dispersion medium (that is, the solid content concentration of the adhesive). The higher the solid content concentration, the higher the viscosity of the adhesive. Furthermore, the viscosity of the adhesive can also be adjusted by appropriately changing the mixing ratio of the main agent and the curing agent and the type of the main agent and / or the curing agent.

<Battery module>
The battery module of Example 1 was obtained by the battery module manufacturing method of Example 1. As shown in FIGS. 1 and 2, the battery module of Example 1 includes the battery cell 1, the adhesive layer 84, the holder 5, the separator 90, and the bus bar 91.

  The battery module of Example 1 has 16 battery cells 1. Each battery cell 1 is a substantially identical cylindrical cell, and has terminals 19 (a positive terminal and a negative terminal) at both ends in the axial direction Y, respectively. The holder 5 is substantially plate-shaped and has 16 battery holding portions 50. Each battery holding part 50 has a through hole shape, and the inner diameter of each battery holding part 50 is slightly larger than the outer diameter of each battery cell 1. Corresponding battery cells 1 are inserted into the respective battery holding portions 50. In the battery module of Example 1, each battery cell 1 is connected in series by two bus bars 91 as a set of four. A conductive material layer (not shown) is provided between the bus bar 91 and the battery cell 1. The conductive material layer is a layer for electrically connecting the bus bar 91 and the terminal 19 of the battery cell 1. The shape of the conductive material layer is not particularly limited and can be formed by a known method such as tab welding, wire bonding, or brazing.

  A separator 90 is locally interposed between the bus bar 91 and the battery cell 1. The separator 90 is a member for connecting the battery cell 1 by the bus bar 91 while partially preventing the electrical connection between the battery cell 1 and the bus bar 91 to prevent a short circuit. The separator 90 may be made of an insulating material and is made of an insulating resin in this embodiment.

  The adhesive layer 84 is provided between the inner peripheral surface of the battery holding unit 50 (more specifically, the inner peripheral surface 50v of the general portion 50a) provided on the holder 5 and the outer peripheral surface 11 of the battery cell 1. It is interposed and fixed to the inner peripheral surface of the battery holding part 50 and the outer peripheral surface 11 of the battery cell 1. As shown in FIG. 3, the adhesive layer 84 has a first adhesive layer 81 and a second adhesive layer 85 and has a two-layer structure. The adhesive layer 84 is provided in a partial region of the battery cell 1 in the axial direction Y (vertical direction in FIG. 1). The region of the battery cell 1 where the adhesive layer 84 is provided is referred to as a fixed region Z. The adhesive layer 84 is interposed between the inner peripheral surface of the battery holding unit 50 and the outer peripheral surface 11 of the battery cell 1 over the entire circumference in the circumferential direction of the battery cell 1 in the fixing region Z. For this reason, the adhesive layer 84 has a substantially cylindrical shape as shown in FIG.

  The adhesive layer 84 has a two-layer structure of a first adhesive layer 81 located on the radially inner side (inner circumferential side) and a second adhesive layer 85 located on the radially outer side (outer circumferential side). The first adhesive layer 81 is in contact with the outer peripheral surface 11 of the battery cell 1 and fixed to the outer peripheral surface 11 of the battery cell 1 over the entire circumference in the circumferential direction of the battery cell 1 in the fixing region Z. The second adhesive layer 85 is in contact with the inner peripheral surface of the battery holding unit 50 over the entire circumference of the battery cell 1 in the fixing region Z, and is fixed to the inner peripheral surface of the battery holding unit 50. The fixed region Z substantially coincides with the first region I. Further, the first adhesive layer 81 and the second adhesive layer 85 are fixed and integrated at the boundary surface. More specifically, the first adhesive layer 81 and the second adhesive layer 85 each have a substantially cylindrical shape, the inner peripheral surface 81b of the first adhesive layer 81 is in contact with the outer peripheral surface 11 of the battery cell 1, and the first adhesive layer The outer peripheral surface 81 a of 81 and the inner peripheral surface 85 b of the second adhesive layer 85 are in contact with each other, and the outer peripheral surface 85 a of the second adhesive layer 85 is in contact with the inner peripheral surface of the battery holding unit 50. That is, the adhesive layer 84 is spread between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface of the battery holding part 50 in the fixing region Z, and is filled without a gap. In Example 1, the adhesive layer 84 is spread between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 50v of the general portion 50a in the fixing region Z, and is filled without a gap.

  As described above, in the manufacturing method of Example 1, the first adhesive layer 41 is made of the first adhesive, and the second adhesive layer 45 is made of the second adhesive. For this reason, in the battery module of Example 1 manufactured by the manufacturing method of Example 1, as shown in FIG. 3, the second end of the adhesive layer 84 in the axial direction Y (referred to as the insertion tip side) is the second. An adhesive layer 85 covers the first adhesive layer 81. In the battery module of Example 1 obtained by the manufacturing method of Example 1, the first adhesive layer 81 is the second adhesive layer 85 on the other end side (insertion rear end side) of the adhesive layer 84 in the axial direction Y. Covering.

(Example 2)
6 is an explanatory view schematically showing an insertion step in the method for manufacturing the battery module of Example 2. FIG.

  In the battery module manufacturing method of Example 2, the second adhesive layer 45 is formed in the third region III, and the bottom surface 50x of the holder pool portion 50b has a tapered surface shape inclined toward the front side in the insertion direction. Except for this, the method is substantially the same as the method for manufacturing the battery module of Example 1. Therefore, the preparation step and the cell fixing step in the battery module manufacturing method of Example 2 are substantially the same as those of Example 1. Therefore, in Example 2, only the coating process and the insertion process will be described. Hereinafter, when it is in the state shown in the left part of FIG. 6, that is, when the battery holding portion 50 of the holder 5 and the battery cell 1 are arranged in alignment in the stage before the insertion step, as necessary, Called when aligning.

  The holder pool portion 50b has a bottom surface 50x and an inner peripheral surface 50w as in the first embodiment. The inner peripheral surface 50w extends along the axial direction Y, but the bottom wall 50x has a tapered shape inclined toward the front side in the insertion direction. In other words, the bottom wall 50x has a tapered shape in which the hole diameter gradually decreases from the rear side in the insertion direction toward the front side in the insertion direction.

  The third region III is a region including the insertion start end 5x in the battery holding unit 50 of the holder 5. In the second embodiment, the third region III corresponds to the holder pool portion 50b.

  The second adhesive layer 45 having a substantially short cylindrical shape is held in the holder 5 by applying the second adhesive over the entire circumference of the third region III, that is, the entire inner peripheral surface 50w of the holder pool portion 50b. It was formed on the inner peripheral surface of the part 50. The inner diameter of the second adhesive layer 45 is smaller than the hole diameter of the general part 50a. In other words, the inner peripheral surface 45 b of the cylindrical second adhesive layer 45 is located on the radially inner side with respect to the inner peripheral surface of the battery holding unit 50.

  As shown in FIG. 6, in the coating step in the method for manufacturing the battery module of Example 2, an adhesive was applied to the outer peripheral surface 11 of the battery cell 1 and the inside of the holder pool portion 50 b in the holder 5. Specifically, a first adhesive layer 41 was formed by applying a first adhesive to the outer peripheral surface 11 of the battery cell 1. Moreover, the 2nd adhesive agent was apply | coated inside the holder pool part 50b, and the 2nd adhesive bond layer 45 was formed. The second adhesive layer 45 adhered to substantially the entire bottom surface 50x and inner peripheral surface 50w of the holder pool portion 50b.

  The outer diameter of the second adhesive layer 45 was substantially the same as the hole diameter of the holder pool portion 50b, and the inner diameter of the second adhesive layer 45 was substantially the same as the outer diameter of the battery cell 1. The outer diameter of the first adhesive layer 41 was larger than the outer diameter of the second adhesive layer 45 and the hole diameter of the holder pool portion 50b.

  The thickness of the first adhesive layer 41 and the thickness of the second adhesive layer 45 were the same as in Example 1. The inner diameter of the first adhesive layer 41 was substantially the same as that of the battery cell 1. The inner diameter of the second adhesive layer 45 was also approximately the same diameter as the inner diameter of the first adhesive layer 41 and the battery cell 1.

(Insertion process)
After the application step described above, the battery cell 1 on which the first adhesive layer 41 is formed is aligned with the battery holding part 50 of the holder 5 on which the second adhesive layer 45 is formed, and the battery cell 1 is connected to the battery holding part. 50. Then, as shown in the left part of FIG. 6, the first adhesive layer 41 contacts the second adhesive layer 45 and presses the second adhesive layer 45 toward the front side in the insertion direction, that is, the axial direction Y. . Therefore, in the insertion step of Example 2, as in the insertion step of Example 1, the first adhesive layer 41 functions as a pressing material for the second adhesive layer 45 and is pressed by the first adhesive layer 41. The second adhesive layer 45 functions as a lubricant, and both the first adhesive layer 41 and the second adhesive layer 45 also function as a filler, and the bonding space between the general portion 50a and the battery cell 1 20 is sufficiently filled with the first adhesive layer 41 and the second adhesive layer 45. Further, due to the function of the holder pool portion 50 b, the residual amount of the second adhesive layer 45 outside the battery holding portion 50 is small, and a sufficient amount of the second adhesive layer 45 is inserted into the adhesive space 20. For this reason, the axial length of the adhesive layer 84 formed in the adhesive space 20 is sufficiently long, and the battery cell 1 and the holder 5 are bonded with high adhesive strength.

  By the way, in Example 2, the bottom face 50x of the holder pool part 50b is a taper shape. For this reason, the 2nd adhesive bond layer 45 flows in smoothly from the holder pool part 50b to the general part 50a. That is, the second adhesive layer 45 is pushed more smoothly into the front side in the insertion direction, and the residual amount of the second adhesive layer 45 outside the battery holding unit 50 is further reduced.

  In the manufacturing method of Example 2, the first region I includes the front end region in the insertion direction on the outer peripheral surface 11 of the battery cell 1, but the first region I in the manufacturing method of the present invention is the end region. May not be included. That is, the adhesive layer 4 may be formed up to the distal end portion in the insertion direction on the outer peripheral surface 11 of the battery cell 1 or may be formed while avoiding the distal end portion. In any case, the first adhesive layer 41 and the second adhesive are spread by spreading the second adhesive layer 45 with the first adhesive layer 41 in the same manner as in the manufacturing methods of the first and second embodiments. The adhesive layer 4 composed of the layer 45 can be filled in the adhesive space 20 provided between the general portion 50a and the battery cell 1 without a gap. Furthermore, in the battery module manufacturing method of the present invention, the second adhesive layer 45 may be formed in at least one of the second region II and the third region III, and in both the second region II and the third region III. It may be formed.

(Example 3)
FIG. 7 is an explanatory view schematically showing an insertion step in the method for manufacturing the battery module of Example 3.

  The manufacturing method of the battery module of Example 3 is the same as the manufacturing method of the battery module of Example 1, except that the holder pool part is not provided in the holder, and instead the adhesive pool part is provided in the first adhesive layer. It is roughly the same.

  Therefore, the preparation step and the cell fixing step in the method for manufacturing the battery module of Example 3 are substantially the same as those in Example 1. Therefore, also in Example 3, only the coating process and the insertion process will be described.

(Coating process)
In Example 3, as in Example 1, the first adhesive layer 41 was formed in the first region I, and the second adhesive layer 45 was formed in the second region II. The first adhesive layer 41 includes a general adhesive portion 41a and an adhesive pool portion 41b. Each of the general bonding portion 41a and the bonding pool portion 41b has a substantially cylindrical shape and is arranged coaxially. In addition, the adhesive pool portion 41 b constitutes the distal end portion in the insertion direction of the first adhesive layer 41. The outer diameter of the general bonding portion 41a and the outer diameter of the bonding pool portion 41b are substantially the same, but the inner diameter of the bonding pool portion 41b is larger than the inner diameter of the general bonding portion 41a. The inner diameter difference between the bonding pool portion 41b and the general bonding portion 41a is not particularly limited, but is preferably 0.1 mm or more, like the inner diameter difference between the general portion 50a and the holder pool portion 50b in the first embodiment. More preferably, it is 4 mm or more. Although an upper limit is also not specifically limited, If it is strong, it is preferable that it is 2 mm or less.

  As shown in the left part of FIG. 7, a concave space is defined between the inner peripheral surface 41 w of the adhesive pool portion 41 b and the outer peripheral surface 11 of the battery cell 1. This concave space is filled with a part of the second adhesive layer 45. The outer diameter of the first adhesive layer 41 is larger than the outer diameter of the second adhesive layer 45. The outer diameter of the second adhesive layer 45 is slightly larger than the hole diameter of the battery holding part 50 in the holder 5.

(Insertion process)
The battery cell 1 in which the 1st adhesive layer 41 and the 2nd adhesive layer 45 were formed was inserted in the battery holding | maintenance part 50 of the holder 5 after the application | coating process mentioned above. Then, as shown in the second part from the left in FIG. 7, the first adhesive layer 41 stores the second adhesive layer 45 inside, and the second adhesive layer 45 faces the front side in the insertion direction. Pressed. At this time, the second adhesive layer 45 is confined in a region defined by the first adhesive layer 41, the outer peripheral surface 11 of the battery cell 1, and the inner peripheral surface 50 y of the battery holding unit 50, while being inserted in the adhesive space 20. It is pushed into the front side. For this reason, similarly to Example 1 and Example 2, the amount of the second adhesive layer 45 remaining outside the battery holding unit 50 is reduced.

  Thereafter, as shown in the second part from the right in FIG. 7, the first adhesive layer 41 and the second adhesive layer 45 pressed by the first adhesive layer 41 enter the bonding space 20. At this time, as in Example 1 and Example 2, the first adhesive layer 41 functions as a pressing material, the second adhesive layer 45 functions as a lubricant, and the first adhesive layer 41 and the second adhesive layer The adhesive layer 45 also functions as a filler, and the adhesive space 4 is filled in the adhesive space 20. Also in Example 3, since the residual amount of the second adhesive layer 45 outside the battery holding unit 50 is small, the axial length of the adhesive layer 84 in the battery module can be sufficiently increased. Therefore, the adhesive strength between the battery cell 1 and the holder 5 is sufficiently improved.

  As in the first to third embodiments, the outer diameter of the first adhesive layer 41 is preferably larger than the outer diameter of the second adhesive layer 45 and the hole diameter of the battery holding unit 50. The preferred range of the difference between the outer diameter of the first adhesive layer 41 and the outer diameter of the second adhesive layer 45 and the difference between the outer diameter of the first adhesive layer 41 and the hole diameter of the battery holding part 50 are the same as in Example 1. It is the same as the described range.

Example 4
FIG. 8 is an explanatory view schematically showing an insertion step in the battery module manufacturing method of Example 4.

  In the battery module manufacturing method of Example 4, the holder pool part 50 b was not provided in the holder 5, and the adhesive pool part 41 b was not provided in the first adhesive layer 41. Instead, the battery holding part 50 was formed in a tapered hole shape in which the hole diameter gradually increased toward the insertion start end part 5x of the battery cell 1. In other words, the hole diameter of the battery holding part 50 on the front side in the insertion direction of the battery cell 1 is smaller than the hole diameter of the battery holding part 50 on the rear side in the insertion direction of the battery cell 1. The surface 50y was mortar-shaped.

  The outer diameter of the first adhesive layer 41 is larger than the outer diameter of the second adhesive layer 45 and larger than the hole diameter of the battery holding portion 50 at the insertion start end portion 5x. The outer diameter of the second adhesive layer 45 is slightly larger than the hole diameter of the battery holding part 50 at the insertion start end part 5x. Except this, the manufacturing method of the battery module of Example 4 is substantially the same as the manufacturing method of the battery module of Example 1.

  Therefore, the preparation step and the cell fixing step in the battery module manufacturing method of Example 4 are substantially the same as those of Example 4. Therefore, also in Example 4, only the coating process and the insertion process will be described.

(Coating process)
As shown in the left part of FIG. 8, in Example 4, as in Example 1, the first adhesive layer 41 is formed in the first region I, and the second adhesive layer 45 is formed in the second region II. Formed.

(Insertion process)
The battery cell 1 in which the 1st adhesive bond layer 41 and the 2nd adhesive bond layer 45 were formed is inserted in the battery holding part 50 of the holder 5 after the application | coating process mentioned above. Then, as shown in the second part from the left in FIG. 8, the first adhesive layer 41 presses the second adhesive layer 45 toward the front side in the insertion direction. Since the battery holding part 50 has a tapered hole shape in which the hole diameter gradually increases toward the insertion start end part 5x, most of the second adhesive layer 45 is a part of the battery holding part 50 on the insertion start end part 5x side. Into. Therefore, at this time, the second adhesive layer 45 is confined in a region defined by the first adhesive layer 41, the outer peripheral surface 11 of the battery cell 1, and the inner peripheral surface 50y of the battery holding unit 50, and in the adhesive space 20. It is pushed to the front side in the insertion direction. For this reason, as in the first to third embodiments, the amount of the second adhesive layer 45 remaining outside the battery holding unit 50 is reduced.

  Thereafter, as shown in the right part of FIG. 8, the first adhesive layer 41 and the second adhesive layer 45 pressed by the first adhesive layer 41 enter the bonding space 20. At this time, as in Examples 1 to 3, the first adhesive layer 41 functions as a pressing material, the second adhesive layer 45 functions as a lubricant, and the first adhesive layer 41 and the second adhesive layer 41 The adhesive layer 45 also functions as a filler, and the adhesive space 4 is filled in the adhesive space 20. Also in Example 3, since the residual amount of the second adhesive layer 45 outside the battery holding unit 50 is small, the axial length of the adhesive layer 4 is sufficiently long. Therefore, the adhesive strength between the battery cell 1 and the holder 5 is sufficiently improved.

  In addition, in order to insert as many second adhesive layers 45 as possible into the bonding space 20 while providing the battery holding portion 50 as a tapered hole without providing the holder pool portion and the bonding pool portion as in the fourth embodiment. It is essential that the outer diameter of the first adhesive layer 41 is larger than the outer diameter of the second adhesive layer 45 and larger than the hole diameter of the battery holding part 50 at the insertion start end 5x.

  Preferably, on the assumption that the outer diameter of the first adhesive layer 41 is larger than the outer diameter of the second adhesive layer 45, the outer diameter of the first adhesive layer 41 and the outer diameter of the second adhesive layer 45 are The difference is preferably 0.2 mm or more and 1 mm or less.

  Further, on the assumption that the outer diameter of the first adhesive layer 41 is larger than the hole diameter of the battery holding portion 50 at the insertion start end portion 5x, the outer diameter of the first adhesive layer 41 and the battery holding at the insertion start end portion 5x. The difference from the hole diameter of the part 50 is preferably 0.1 mm or more and 1 mm or less.

  The outer diameter of the second adhesive layer 45 may be larger than the hole diameter of the battery holding part 50 at the insertion start end part 5x, but is preferably equal to or smaller than the hole diameter of the battery holding part 50 at the insertion start end part 5x. Under the assumption that the outer diameter of the second adhesive layer 45 is equal to or smaller than the hole diameter of the battery holding portion 50 at the insertion start end portion 5x, the outer diameter of the second adhesive layer 45 and the battery holding portion 50 at the insertion start end portion 5x. The difference from the hole diameter is preferably 0.1 mm or more and 1 mm or less.

  The use of the battery module of the present invention is not particularly limited, and can be arranged in various apparatuses and fixtures. As a specific example, an assembled battery mounted for a vehicle can be mentioned.

(Other)
The present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within a range not departing from the gist. Moreover, each component shown in the embodiment can be arbitrarily extracted and combined.

1: battery cell 5: holder 11: outer peripheral surface 41 of the battery cell: first adhesive layer 45: second adhesive layer 50: battery holding portion I: first region II: second region III: third region 50b: Holder pool part 41b: Adhesion pool part 5x: Insertion start end in battery holding part

Claims (7)

A preparation step of preparing a holder and a battery cell having a battery holding portion in the form of a hole, a coating step of applying an adhesive to at least the outer peripheral surface of the battery cell, and the battery cell on the battery holding portion of the holder An insertion step of inserting,
The battery holding part comprises a general part and a holder pool part having a larger diameter than the general part and constituting an insertion start end in the battery holding part,
In the coating step,
In the first region, which is at least a partial region in the axial direction on the outer peripheral surface of the battery cell, the first adhesive is applied over the entire outer periphery of the battery cell to form a cylindrical first adhesive layer And
A second adhesive having a viscosity lower than that of the first adhesive is positioned on the outer peripheral surface of the battery cell on the front side of the battery cell in the insertion direction of the battery cell and adjacent to the first region. A method for manufacturing a battery module, wherein a cylindrical second adhesive layer is formed by coating over the entire circumference of at least one of a region and a third region including the holder pool portion in the holder. A preparation step of preparing a holder and a battery cell having a battery holding portion in the form of a hole, a coating step of applying an adhesive to at least the outer peripheral surface of the battery cell, and the battery cell on the battery holding portion of the holder An insertion step of inserting,
In the coating step,
In the first region, which is at least a partial region in the axial direction on the outer peripheral surface of the battery cell, the first adhesive is applied over the entire outer periphery of the battery cell to form a cylindrical first adhesive layer And
A second adhesive having a viscosity lower than that of the first adhesive is positioned on the outer peripheral surface of the battery cell on the front side of the battery cell in the insertion direction of the battery cell and adjacent to the first region. Coating the entire circumference of at least one of the region and the third region including the insertion start end of the battery holding portion of the holder to form a cylindrical second adhesive layer;
The first adhesive layer is composed of a general adhesive portion and an adhesive pool portion that is continuous with the general adhesive portion and is located on the front side in the battery cell insertion direction with respect to the general adhesive portion and has a larger hole diameter than the general adhesive portion. A method for manufacturing a battery module, comprising: A preparation step of preparing a holder and a battery cell having a battery holding portion in the form of a hole, a coating step of applying an adhesive to at least the outer peripheral surface of the battery cell, and the battery cell on the battery holding portion of the holder An insertion step of inserting,
The battery holding portion is formed in a tapered hole shape in which the hole diameter gradually increases toward the insertion start end portion in the battery holding portion,
In the coating step,
In the first region, which is at least a partial region in the axial direction on the outer peripheral surface of the battery cell, the first adhesive is applied over the entire outer periphery of the battery cell to form a cylindrical first adhesive layer And
A second adhesive having a viscosity lower than that of the first adhesive is positioned on the outer peripheral surface of the battery cell on the front side of the battery cell in the insertion direction of the battery cell and adjacent to the first region. Coating the entire circumference of at least one of the region and the third region including the insertion start end of the holder to form a cylindrical second adhesive layer;
The battery module manufacturing method, wherein an outer diameter of the first adhesive layer is provided larger than an outer diameter of the second adhesive layer and larger than a hole diameter of the insertion start end portion in the battery holding portion.   3. The battery module manufacturing method according to claim 1, wherein, in the inserting step, an outer diameter of the first adhesive layer is larger than a hole diameter of the battery holding portion.   5. The battery module according to claim 1, wherein an outer diameter of the first adhesive layer is larger than an outer diameter of the second adhesive layer in the inserting step. Manufacturing method. A battery module manufactured by the battery module manufacturing method according to claim 1 and having a hole-shaped battery holder, at least a part of the battery cell inserted in the battery holder, the battery holder, An adhesive layer formed between the outer peripheral surface of the battery cell,
The battery holding part is composed of a general part and a holder pool part having a larger diameter than the general part and constituting one open end of the battery holding part,
At least a portion of the adhesive layer is made of the first adhesive and is in contact with the outer peripheral surface of the battery cell, and the outer peripheral surface of the first adhesive layer is made of the second adhesive and the first adhesive layer. A battery module having a two-layer structure having a second adhesive layer in contact with the battery holding portion. A battery module manufactured by the battery module manufacturing method according to claim 3 and having a hole-shaped battery holder, a battery cell at least partially inserted in the battery holder, the battery holder, and the battery holder An adhesive layer formed between the outer peripheral surface of the battery cell,
The battery holding part has a tapered hole shape in which the hole diameter gradually increases toward the insertion start end of the battery cell,
At least a part of the adhesive layer in the axial direction is formed of the first adhesive and is in contact with the outer peripheral surface of the battery cell. The outer periphery of the first adhesive layer is formed of the second adhesive. A battery module having a two-layer structure having a surface and a second adhesive layer in contact with the battery holding portion.

Images