JP6213395B2 - Battery module manufacturing method - Google Patents

Description

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

  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, there is a problem that it is difficult to improve the adhesive strength and it is difficult to stably bond and integrate the battery cell to the holder.

JP 2013-8655 A

  This invention is made | formed in view of the said situation, and it aims at providing the method for manufacturing the battery module with which the adhesive agent was fully filled between the battery holding part of the holder and the battery cell. .

The manufacturing method of the 1st battery module of the present invention which solves the above-mentioned subject is,
A preparation step of preparing a holder and battery cell having a hole-shaped battery holding portion, and an adhesive layer forming step of forming an adhesive layer made of an adhesive on the outer peripheral surface of the battery cell and the inner peripheral surface of the battery holding portion And an insertion step of inserting the battery cell into the battery holding portion of the holder,
In the adhesive layer forming step,
The first adhesive layer formed on the outer peripheral surface of the battery cell and the second adhesive layer formed on the inner peripheral surface of the battery holding portion are composed of an adhesive having the same composition,
In at least a partial region of the outer peripheral surface of the battery cell in the axial direction, the first adhesive layer is formed over the entire outer periphery of the battery cell;
By forming the second adhesive layer over the entire circumference of the inner peripheral surface of the battery holding part in at least a partial region in the axial direction on the inner peripheral surface of the battery holding part,
In the inserting step, the first adhesive layer and the second adhesive layer interact with each other.

The manufacturing method of the second battery module of the present invention that solves the above problems is as follows.
A preparation step of preparing a holder and battery cell having a hole-shaped battery holding portion, and an adhesive layer forming step of forming an adhesive layer made of an adhesive on the outer peripheral surface of the battery cell or the inner peripheral surface of the battery holding portion And an insertion step of inserting the battery cell into the battery holding portion of the holder,
The adhesive comprises a high-viscosity adhesive, and a low-viscosity adhesive having the same composition as the high-viscosity adhesive and having a lower viscosity than the high-viscosity adhesive,
In the adhesive layer forming step,
First, a high-viscosity adhesive layer made of the high-viscosity adhesive is formed over the entire circumference of the outer peripheral surface of the battery cell in at least a partial region of the outer peripheral surface of the battery cell, and then the high-viscosity adhesive Forming a low-viscosity adhesive layer composed of the low-viscosity adhesive over the entire circumference of the outer peripheral surface of the high-viscosity adhesive layer in at least a partial region of the outer peripheral surface of the layer;
Or
First, in at least a partial region of the inner peripheral surface of the battery holding portion in the axial direction, a high viscosity adhesive layer made of the high viscosity adhesive is formed over the entire inner peripheral surface of the battery holding portion, and then In at least a part of the axial direction of the outer peripheral surface of the high-viscosity adhesive layer, by forming a low-viscosity adhesive layer made of the low-viscosity adhesive over the entire circumference of the high-viscosity adhesive layer,
In the inserting step, the high-viscosity adhesive layer and the low-viscosity adhesive layer interact with each other.

The third battery module manufacturing method of the present invention that solves the above problems is as follows.
A preparation step of preparing a holder and battery cell having a hole-shaped battery holding portion, and an adhesive layer forming step of forming an adhesive layer made of an adhesive on the outer peripheral surface of the battery cell or the inner peripheral surface of the battery holding portion And an insertion step of inserting the battery cell into the battery holding portion of the holder,
In the adhesive layer forming step,
First, in at least a partial region of the outer peripheral surface of the battery cell in the axial direction, the adhesive layer is formed over the entire outer periphery of the battery cell, and then the adhesive layer is heated from the outer peripheral surface side. , Or lower the viscosity of the outer peripheral surface side portion of the adhesive layer compared to the inner peripheral surface side portion,
Or
The adhesive layer is formed over the entire circumference of the inner peripheral surface of the battery holding portion in at least a partial region of the inner peripheral surface of the battery holding portion, and then the adhesive layer is heated from the inner peripheral surface side. By making the inner peripheral surface side portion in the adhesive layer lower in viscosity than the outer peripheral surface side portion,
In the inserting step, the outer peripheral surface side portion and the inner peripheral surface side portion of the adhesive layer are caused to interact with each other.

  The manufacturing method of the first battery module of the present invention preferably has the following element (1), and has the element (1) and the element (2) or the element (1) and the element (3). More preferably.

Moreover, it is preferable that the manufacturing method of the 2nd battery module of this invention has the following element (2) or element (3).
(1) One of the adhesive constituting the first adhesive layer and the adhesive constituting the second adhesive layer is a high-viscosity adhesive, and the other is a low viscosity having a lower viscosity than the high-viscosity adhesive. It is a viscous adhesive.
(2) The high-viscosity adhesive and the low-viscosity adhesive are made of an adhesive having the same composition, and the viscosity is adjusted by controlling the temperature.
(3) The high-viscosity adhesive and the low-viscosity adhesive are made of an adhesive having the same composition including a base material and a curing agent, and control an elapsed time after the start of the reaction between the base material and the curing agent. Thus, the viscosity is adjusted.

  In the first battery module manufacturing method to the third battery module manufacturing method of the present invention, the preparation step and the insertion step are the same, and only the adhesive layer forming step is different. However, as will be described later, the behavior of the adhesive in the insertion step varies depending on the configuration and formation position of the adhesive layer.

  The first battery module manufacturing method to the third battery module manufacturing method of the present invention all use an adhesive having the same composition in the adhesive layer forming step. The symbolic difference in the adhesive layer forming step in each battery module manufacturing method is as follows.

  In the adhesive layer forming step in the first battery module manufacturing method, an adhesive layer made of an adhesive having the same composition is formed on the outer peripheral surface of the battery cell and the inner peripheral surface of the battery holding part.

  In the adhesive layer forming step in the second battery module manufacturing method, an adhesive layer is formed on the outer peripheral surface of the battery cell or the inner peripheral surface of the battery holding portion, and the adhesive layer is made of an adhesive having the same composition and has a different viscosity. It has a layer structure and has a low viscosity on the surface side.

  In the adhesive layer forming step in the third battery module manufacturing method, an adhesive layer is formed on the outer peripheral surface of the battery cell or the inner peripheral surface of the battery holding portion, and the adhesive layer is softened by heating the adhesive layer from the surface side. The surface side, that is, the heated side portion of the adhesive layer is made to have a lower viscosity than the other portions.

  Hereinafter, the first battery module manufacturing method of the present invention is referred to as a first manufacturing method, the second battery module manufacturing method is referred to as a second manufacturing method, and the third battery module The manufacturing method is referred to as a third manufacturing method.

  According to the manufacturing method of the 1st-3rd battery module of this invention, an adhesive agent can fully be filled between the battery holding part and battery cell of a holder.

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. It is explanatory drawing which represents typically the contact bonding layer formation process and insertion process in the manufacturing method of Example 1. FIG. It is explanatory drawing which represents typically the contact bonding layer formation process and insertion process in the manufacturing method of Example 2. FIG. It is explanatory drawing which represents typically the contact bonding layer formation process in the manufacturing method of Example 4, and an insertion process. It is sectional drawing which represents typically a mode that the battery module of Example 5 was cut | disconnected in the same position as XX position in FIG. It is explanatory drawing which represents typically the contact bonding layer formation process in the manufacturing method of Example 5, and an insertion process.

  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 each embodiment is simply abbreviated as the manufacturing method of each embodiment, as necessary.

Example 1
Example 1 relates to a method for manufacturing a second battery module of the present invention. 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 adhesive layer forming step and an insertion step in the manufacturing method of Example 1. FIG. 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 that coincides with the axial direction Y.

<Production method of battery module>
The battery module manufacturing method of Example 1 is a method of manufacturing a battery module (see FIGS. 1 and 2) having the battery cell 1, the adhesive layer 4, and the holder 5.

  Each battery cell 1 is inserted into a through-hole battery holder 50 provided in the holder 5. The adhesive layer 4 is a layer formed by solidifying an adhesive, which will be described later. The adhesive layer 4 is interposed between the inner peripheral surface 51 of the battery holding unit 50 and the outer peripheral surface 11 of the battery cell 1 and fixes them together. The manufacturing method of the battery module of Example 1 includes a preparation process, an adhesive layer formation process, and an insertion process.

(Preparation process)
In the preparation step, the battery cell 1 and the holder 5 described above were prepared. The battery cell 1 has a substantially cylindrical shape, and the battery holding portion 50 of the holder 5 has a through-hole shape having a slightly larger diameter than the battery cell 1. The battery cell 1 has a portion disposed inside the battery holding portion 50 of the holder 5 and another portion, that is, a portion disposed outside the battery holding portion 50 in the assembled state shown in FIGS. 1 and 3. . Therefore, the outer peripheral surface 11 of the battery cell 1 has a region facing the inner peripheral surface 51 of the battery holding portion 50 of the holder 5 (referred to as a fixing region Z) and other regions in the assembled state. The fixing region Z is a partial region in the axial direction Y on the outer peripheral surface 11 of the battery cell 1. Further, the fixing region Z was continuously formed over the entire circumference of the battery cell 1 in the circumferential direction.

(Adhesive layer forming process)
As shown in the left part of FIG. 4, in the adhesive layer forming step in the manufacturing method of Example 1, an adhesive was applied to the outer peripheral surface 11 of the battery cell 1 to form the adhesive layer 4. As the adhesive, two kinds of adhesives having different viscosities (that is, a high viscosity adhesive and a low viscosity adhesive) were used.

  First, a high-viscosity adhesive was applied to the fixing region Z on the outer peripheral surface 11 of the battery cell 1 to form a high-viscosity adhesive layer 41 on the entire fixing region Z. Next, a low viscosity adhesive was applied to the outer peripheral surface of the high viscosity adhesive layer 41 to form a low viscosity adhesive layer 45. The low viscosity adhesive layer 45 was formed over the entire outer peripheral surface of the high viscosity adhesive layer 41. In the production method of Example 1, the high-viscosity adhesive and the low-viscosity adhesive are adhesives having the same composition, and the low-viscosity adhesive is obtained by lowering the viscosity by increasing the temperature to be higher than that of the high-viscosity adhesive. is there. Examples of such adhesives include synthetic resin adhesives represented by phenol resins, epoxy resins, and acrylic resins, emulsion adhesives represented by vinyl acetate, and ethylene vinyl acetate copolymers (EVA). Examples thereof include hot melt adhesives and synthetic rubber adhesives represented by chloroprene.

  By this step, the adhesive layer 4 composed of the low viscosity adhesive layer 45 and the high viscosity adhesive layer 41 was formed.

  The outer diameter of the adhesive layer 4 is larger than the hole diameter of the battery holding part 50 in the holder 5. That is, the thickness of the adhesive layer 4 is larger than the distance between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 51 of the battery holding part 50 in the assembled state. In other words, as shown in the left part of FIG. 4, when the battery holding part 50 of the holder 5 and the battery cell 1 are aligned and arranged in the stage before the insertion process (hereinafter referred to as alignment when necessary). In other words, the outer peripheral surface of the cylindrical adhesive layer 4 is located on the radially outer side of the inner peripheral surface 51 of the battery holding unit 50. Further, the inner diameter of the substantially cylindrical adhesive layer 4 is smaller than the hole diameter of the battery holding portion 50. That is, since the inner peripheral surface of the cylindrical adhesive layer 4 coincides with the outer peripheral surface 11 of the battery cell, the inner peripheral surface of the adhesive layer 4 is more radial than the inner peripheral surface 51 of the battery holding portion 50 during alignment. Located inside.

  In the manufacturing method of Example 1, the coating thickness of the high viscosity adhesive was about 0.3 to 2.0 mm. On the other hand, the coating thickness of the low viscosity adhesive was about 0.05 to 0.3 mm. Therefore, the application thickness of the high viscosity adhesive was thicker than the application thickness of the low viscosity adhesive. The coating thickness of the high viscosity adhesive, that is, the thickness of the high viscosity adhesive layer 41 was larger than the distance between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 51 of the battery holding part 50 in the battery module. The coating thickness of the low viscosity adhesive, that is, the thickness of the low viscosity adhesive layer 45 was smaller than the distance between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 51 of the battery holding part 50 in the battery module. Here, the thickness of the low-viscosity adhesive layer 45 and the thickness of the high-viscosity adhesive layer 41 refer to the average values of the respective thicknesses, and the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface of the battery holding unit 50. The distance to 51 refers to the average value of the distances.

(Insertion process)
After the adhesive layer forming step described above, the battery cell 1 on which the adhesive layer 4 was formed was aligned with the battery holding part 50 of the holder 5, and the battery cell 1 was inserted into the battery holding part 50. Specifically, as shown in the left part of FIG. 4, the battery cell 1 is inserted into the battery holder 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 adhesive layer 4 is provided on the outer peripheral surface 11 of the battery cell 1, the low viscosity adhesive layer 45 is positioned on the outer peripheral side of the adhesive layer 4, and the high viscosity adhesive layer 41 is the inner peripheral side of the adhesive layer 4. Located in. The sum of the thickness of the high-viscosity adhesive layer 41 and the thickness of the low-viscosity adhesive layer 45 is larger than the distance between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 51 of the battery holding unit 50 in the battery module. More specifically, the thickness of the adhesive layer 4 is defined by the inner peripheral surface 51 of the battery holding unit 50 and the outer peripheral surface 11 of the battery cell 1 before the battery cell 1 is inserted into the battery holding unit 50. It is larger than the thickness of the space (referred to as the bonding space 20), that is, ½ of the difference between the outer diameter and the inner diameter of the bonding space 20 having a substantially cylindrical shape. For this reason, as shown in the center portion in FIG. 4, when the battery cell 1 is inserted into the battery holding portion 50, the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45 are in pressure contact. The viscosity of the high-viscosity adhesive layer 41 made of a high-viscosity adhesive is higher than the viscosity of the low-viscosity adhesive layer 45 made of a low-viscosity adhesive, and the high-viscosity adhesive layer 41 is less likely to deform than the low-viscosity adhesive layer 45. Accordingly, at this time, the low-viscosity adhesive layer 45 is pressed by the high-viscosity adhesive layer 41 and greatly deformed, and is filled in the adhesive space 20.

  In other words, as shown in the center part of FIG. 4, when the battery cell 1 is inserted into the battery holding part 50, the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45 are in pressure contact, and the high-viscosity adhesive layer 41. The low-viscosity adhesive layer 45 is deformed relative to the high-viscosity adhesive layer 41 at the interface between the low-viscosity adhesive layer 45 and the low-viscosity adhesive layer 45. Therefore, the low-viscosity adhesive layer 45 functions as a filler filled between the inner peripheral surface 51 of the battery holding unit 50 and the outer peripheral surface 41a of the high-viscosity adhesive layer 41, and the high-viscosity adhesive layer 41 has a low-viscosity adhesive. It functions as a pressing material for spreading the layer 45. Further, the low viscosity adhesive layer 45 also functions as a lubricant for the high viscosity adhesive layer 41, and the high viscosity adhesive layer 41 also functions as a filler. For this reason, after the insertion step, the adhesive layer 4 composed of the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45 is filled in the adhesive space 20 provided between the battery holding part 50 and the battery cell 1 without a gap. .

  In other words, the low-viscosity adhesive layer 45 is formed on the outer peripheral surface of the base material (in the first embodiment, the outer peripheral surface 11 of the battery cell 1) together with the high-viscosity adhesive layer 41, and the counterpart material (the holder 5 in the first embodiment). ). For this reason, the low-viscosity adhesive layer 45 functions as a lubricant for sliding the base material (battery cell 1) and the high-viscosity adhesive layer 41 and the counterpart material (holder 5), and the low-viscosity adhesive layer 45 itself It is spread between the counterpart material (holder 5) and the high-viscosity adhesive layer 41 and filled in the gap between the counterpart material (holder 5) and the high-viscosity adhesive layer 41. Therefore, a gap is hardly generated between the low-viscosity adhesive layer 45 and the counterpart material (holder 5).

  Since the high-viscosity adhesive layer 41 is also deformable, the high-viscosity adhesive layer 41 is also deformed along with the deformation of the low-viscosity adhesive layer 45 at this time. Therefore, a gap is hardly generated between the low viscosity adhesive layer 45 and the high viscosity adhesive layer 41. Since the low-viscosity adhesive layer 45 is on the side of the counterpart material (holder 5) that has not yet been wetted with the adhesive, the counterpart material (holder 5) is easily wetted by the adhesive layer 4 (mainly the low-viscosity adhesive layer 45). The adhesive layer 4 is filled in the bonded space 20 without a gap or almost without a gap.

  Focusing on the shapes of the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45, basically, the deformation amount of the high-viscosity adhesive layer 41 is changed from the insertion rear end side (lower side in FIG. 1) to the insertion front end side (FIG. 1). Gradually increases toward the upper side of This is because the insertion tip end portion of the high viscosity adhesive layer 41 receives a greater reaction force from the low viscosity adhesive layer 45 than the insertion rear end portion. The difference in the deformation amount of the high-viscosity adhesive layer 41 becomes more prominent as the difference in viscosity between the high-viscosity adhesive layer 41 and the low-viscosity adhesive 45 becomes smaller. On the other hand, if the difference in viscosity between the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45 is large, the difference in deformation amount of the high-viscosity adhesive layer 41 is small, and the thickness of the high-viscosity adhesive layer 41 is from the rear end side of the insertion. It becomes substantially constant until reaching the insertion tip side. In the manufacturing method of Example 1, the difference in viscosity between the high viscosity adhesive layer 41 and the low viscosity adhesive layer 45 is large. Therefore, the difference in deformation amount of the high-viscosity adhesive layer 41 is small, the thickness of the high-viscosity adhesive layer 41 is substantially constant, and the thickness of the low-viscosity adhesive layer 45 is also substantially constant.

(Cell fixing process)
After the above-described insertion process, the battery cell 1 is inserted into the battery holding unit 50, and the adhesive space 20 is filled with the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45. The composite of the layer 4 was allowed to stand, and the fluid adhesive layer 4 was changed to a solid state, whereby the battery module of Example 1 having the adhesive layer 4, the battery cell 1, and the holder 5 was obtained.

  In the manufacturing method of Example 1, the adhesive layer 4 is composed of two layers of the low-viscosity adhesive layer 45 and the high-viscosity adhesive layer 41. As described above, in the insertion step, the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer are formed. Thus, the battery module in which the adhesive layer 4 is sufficiently filled between the battery holding portion 50 of the holder 5 and the battery cell 1 can be easily manufactured.

  In the adhesive layer forming step of the manufacturing method of Example 1, the low-viscosity adhesive layer 45 is formed over the entire outer peripheral surface of the high-viscosity adhesive layer 41, but the formation position of the low-viscosity adhesive layer 45 is not limited to this. That is, in the second manufacturing method of the present invention, the low-viscosity adhesive layer 45 may be formed over the entire circumference in the circumferential direction of the high-viscosity adhesive layer 41. You may form only in a part of axial direction in a surface.

  In Example 1, the adhesive layer 4 is formed on the outer peripheral surface 11 of the battery cell 1. However, the adhesive layer 4 may be formed on the inner peripheral surface 51 of the battery holding unit 50. In this case, if the low-viscosity adhesive layer 45 is arranged on the inner peripheral side and the high-viscosity adhesive layer 41 is arranged on the outer peripheral side, the mating material (in this case the battery in this case) is inserted as in the manufacturing method of the first embodiment. The low-viscosity adhesive layer 45 is disposed on the cell 1) side, and the adhesive layer 4 is filled in the adhesive space 20 without a gap. In this case, the low-viscosity adhesive layer 45 may be formed over the entire circumference of the high-viscosity adhesive layer 41 in the circumferential direction.

  Hereinafter, the battery module of Example 1 will be described for reference.

<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 a battery cell 1, an adhesive layer 4, a holder 5, a separator 90, and a 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 4 is a layer formed by solidifying an adhesive, which will be described later, and is interposed between the inner peripheral surface 51 of the battery holding part 50 provided in the holder 5 and the outer peripheral surface 11 of the battery cell 1. The battery holder 50 is fixed to the inner peripheral surface 51 and the outer peripheral surface 11 of the battery cell 1. As shown in FIG. 3, the adhesive layer 4 has a two-layer structure having a high-viscosity adhesive layer 41 and a low-viscosity adhesive layer 45 made of an adhesive having the same composition. The adhesive layer 4 is provided in the fixing region Z of the battery cell 1. The adhesive layer 4 is interposed between the inner peripheral surface 51 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 4 has a substantially cylindrical shape as shown in FIG.

  The high-viscosity adhesive layer 41 is in contact with 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, and is fixed to the outer peripheral surface 11 of the battery cell 1. The low-viscosity adhesive layer 45 is in contact with the inner peripheral surface 51 of the battery holding unit 50 and fixed to the inner peripheral surface 51 of the battery holding unit 50 over the entire circumference in the circumferential direction of the battery cell 1 in the fixing region Z. Further, the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45 are fixed and integrated at the boundary surface. More specifically, the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45 each have a substantially cylindrical shape, and the inner peripheral surface 41b of the high-viscosity adhesive layer 41 is in contact with the outer peripheral surface 11 of the battery cell 1, and the high-viscosity adhesive layer The outer peripheral surface 41 a of 41 and the inner peripheral surface 45 b of the low viscosity adhesive layer 45 are in contact with each other, and the outer peripheral surface 45 a of the low viscosity adhesive layer 45 is in contact with the inner peripheral surface 51 of the battery holding unit 50. That is, the adhesive layer 4 is spread between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 51 of the battery holding part 50 in the fixing region Z, and is filled without a gap.

  As described above, in the manufacturing method of Example 1, the high viscosity adhesive layer 41 is made of a high viscosity adhesive, and the low viscosity adhesive layer 45 is made of a low viscosity adhesive. Therefore, in the battery module of Example 1, as shown in FIG. 3, the low-viscosity adhesive layer 45 is replaced with the high-viscosity adhesive layer 41 on one end side (referred to as the insertion tip side) of the adhesive layer 4 in the axial direction Y. Covering. In the battery module of Example 1 obtained by the manufacturing method of Example 1, the high-viscosity adhesive layer 41 is the low-viscosity adhesive layer 45 on the other end side (insertion rear end side) of the adhesive layer 4 in the axial direction Y. Covering. However, the present invention is not limited thereto, and the low-viscosity adhesive layer 45 may cover the high-viscosity adhesive layer 41 on the rear end side of the insertion.

(Example 2)
Example 2 relates to a method for manufacturing the first battery module of the present invention. In the manufacturing method of Example 2, the high viscosity adhesive layer 41 is formed on the outer peripheral surface 11 of the battery cell 1 and the low viscosity adhesive layer 45 is formed on the inner peripheral surface 51 of the battery holding portion 50 in the holder 5. This is substantially the same as the method for manufacturing the battery module of Example 1. Therefore, the preparation process and the cell fixing process in the manufacturing method of Example 2 are substantially the same as those of the manufacturing method of Example 1. Therefore, in Example 2, only the adhesive layer forming step and the inserting step will be described. FIG. 5 is an explanatory view schematically showing an adhesive layer forming step and an inserting step in the manufacturing method of Example 2.

(Adhesive layer forming process)
In the adhesive layer forming step in the manufacturing method of Example 2, the high-viscosity adhesive layer 41 was formed on the outer peripheral surface 11 of the battery cell 1, and the low-viscosity adhesive layer 45 was formed on the inner peripheral surface 51 of the battery holding unit 50. The high-viscosity adhesive layer 41 corresponds to the first adhesive layer in the first battery module manufacturing method. The low-viscosity adhesive layer 45 corresponds to the second adhesive layer in the first battery module manufacturing method. The high viscosity adhesive and the low viscosity adhesive are the same as in Example 1. The high-viscosity adhesive layer 41 was formed on the entire fixing region Z in the battery cell 1, and the low-viscosity adhesive layer 45 was formed on the entire inner peripheral surface 51 of the battery holding unit 50. The high-viscosity adhesive layer 41 was continuously formed over the entire periphery of the battery cell 1, and the low-viscosity adhesive layer 45 was also formed continuously over the entire periphery of the battery holding unit 50.

  As shown in the left part of FIG. 5, the outer peripheral surface 41 a of the cylindrical high-viscosity adhesive layer 41 is positioned radially outside the inner peripheral surface 51 of the battery holding unit 50 during the alignment. Further, the inner peripheral surface 41 b of the cylindrical high-viscosity adhesive layer 41 is located on the radially inner side of the inner peripheral surface 51 of the battery holding unit 50. The low-viscosity adhesive layer 45 also has a cylindrical shape, and the outer peripheral surface 45a of the low-viscosity adhesive layer 45 is located between the outer peripheral surface 41a and the inner peripheral surface 41b of the high-viscosity adhesive layer 41 during alignment. The thickness of the high-viscosity adhesive layer 41 was about 0.3 to 2.0 mm, and the thickness of the low-viscosity adhesive layer 45 was about 0.05 to 0.3 mm.

(Insertion process)
After the application step described above, the battery cell 1 on which the high-viscosity adhesive layer 41 is formed is aligned with the battery holding part 50 of the holder 5 on which the low-viscosity adhesive layer 45 is formed, and the battery cell 1 is attached to the battery holding part 50. Inserted. A high-viscosity adhesive layer 41 is provided on the outer peripheral surface 11 of the battery cell 1, and a low-viscosity adhesive layer 45 is provided on the inner peripheral surface 51 of the battery holding unit 50. The sum of the thickness of the high-viscosity adhesive layer 41 and the thickness of the low-viscosity adhesive layer 45 is greater than the thickness of the adhesive space 20. For this reason, also in the manufacturing method of Example 2, when the battery cell 1 is inserted in the battery holding part 50, the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45 are in pressure contact. The low-viscosity adhesive layer 45 composed of the low-viscosity adhesive is pressed and greatly deformed by the high-viscosity adhesive layer 41 composed of the high-viscosity adhesive, and fills the adhesive space 20. Therefore, as shown in the right part of FIG. 5, also in the manufacturing method of Example 2, the adhesive layer 4 fills the adhesive space 20 provided between the battery holding part 50 and the battery cell 1 without a gap. Is done. In other words, in the manufacturing method of Example 2, in the insertion step, the high-viscosity adhesive layer 41 (that is, the first adhesive layer) and the low-viscosity adhesive layer 45 (that is, the second adhesive layer) were caused to interact with each other. Thus, the adhesive layer 4 can be filled in the adhesive space 20 without any gaps.

  In the adhesive layer forming step of the manufacturing method of Example 2, the high viscosity adhesive layer 41 was formed on the outer peripheral surface 11 of the battery cell 1, and the low viscosity adhesive layer 45 was formed on the inner peripheral surface 51 of the battery holding unit 50. However, the high-viscosity adhesive layer 41 may be formed on the inner peripheral surface 51 of the battery holding unit 50, and the low-viscosity adhesive layer 45 may be formed on the outer peripheral surface 11 of the battery cell 1. In this case, the low-viscosity adhesive layer 45 corresponds to the first adhesive layer in the first battery module manufacturing method. The high-viscosity adhesive layer 41 corresponds to the second adhesive layer in the first battery module manufacturing method. In the adhesive layer forming step of the manufacturing method of Example 2, the low-viscosity adhesive layer 45 is formed on the entire inner peripheral surface 51 of the battery holding unit 50, but the low-viscosity adhesive layer 45 is formed on the inner periphery of the battery holding unit 50. It may be formed over the entire circumference of the surface 51, and may be formed only on a part of the inner circumferential surface 51 in the axial direction. The same applies when the high-viscosity adhesive layer 41 is formed on the inner peripheral surface 51 of the battery holder 50. Moreover, although the high-viscosity adhesive layer 41 is formed over the entire fixing region Z, the high-viscosity adhesive layer 41 may be formed over the entire circumference in the circumferential direction of the battery cell 1, and only in a part of the fixing region Z in the axial direction. It may be formed. The same applies when the low-viscosity adhesive layer 45 is formed on the outer peripheral surface 11 of the battery cell 1.

(Example 3)
Example 3 relates to a method for manufacturing the first battery module of the present invention. The manufacturing method of Example 3 is substantially the same as the manufacturing method of Example 2 except that the compositions of the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45 are different from those of Example 1 and Example 2. Therefore, the adhesive layer forming step and the inserting step in the manufacturing method of the third embodiment can be described with reference to FIG.

  The adhesive used in the manufacturing method of Example 3 is a two-component adhesive composed of a main material and a curing agent. More specifically, the two-component adhesive is solidified by mixing a fluid main agent and a curing agent to cause a polymerization reaction or a crosslinking reaction. The main agent is generally a monomer or oligomer. Specific reactive adhesives include epoxy resin adhesives and cyanoacrylate adhesives. In the production method of Example 3, an epoxy resin adhesive in which bisphenol A (BPA: main agent) and an amine (curing agent) are combined was used. However, the two-component adhesive that can be used in the production method of the present invention. The agent is not limited to this.

  The high-viscosity adhesive and the low-viscosity adhesive are composed of the same main material and curing agent, but the elapsed time after mixing the main material and the curing agent is different from the high-viscosity adhesive and the low-viscosity adhesive. It is different. Specifically, first, the main material and the curing agent were mixed and applied to the outer peripheral surface 11 of the battery cell 1. Then, separately from this, after a predetermined time had elapsed, the main material and the curing agent were mixed and applied to the inner peripheral surface 51 of the battery holding unit 50. The adhesive layer applied and formed on the outer peripheral surface 11 of the battery cell 1 is formed before the adhesive layer applied and formed on the inner peripheral surface 51 of the battery holding unit 50, and the reaction time between the main material and the curing agent is long. Therefore, the adhesive layer formed on the outer peripheral surface 11 of the battery cell 1 becomes a high-viscosity adhesive layer 41 having a higher viscosity than the adhesive layer formed on the inner peripheral surface 51 of the battery holding unit 50. The adhesive layer formed on the inner peripheral surface 51 of the battery holding unit 50 becomes a low-viscosity adhesive layer 45 having a lower viscosity than the high-viscosity adhesive layer 41. The high-viscosity adhesive layer 41 corresponds to the first adhesive layer in the method for manufacturing the first battery module of the present invention, and the low-viscosity adhesive layer 45 is the second in the method for manufacturing the first battery module of the present invention. Corresponds to the adhesive layer.

  Since the manufacturing method of Example 3 is the same as the manufacturing method of Example 2 except for the composition of the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45, the adhesive layer 4 is also attached to the battery holding part 50 by the manufacturing method of Example 3. And the battery cell 1 are filled without any gaps in the bonding space 20 provided between them. That is, in Example 3, in the insertion process, the high-viscosity adhesive layer 41 (that is, the first adhesive layer) and the low-viscosity adhesive layer 45 (that is, the second adhesive layer) are caused to interact with each other. 4 can be filled in the bonding space 20 without a gap.

Example 4
Example 4 relates to a third battery module manufacturing method of the present invention. The manufacturing method of Example 4 is substantially the same as the manufacturing method of Example 1 except that the adhesive layer 4 is formed on the inner peripheral surface 51 of the battery holding unit 50 and heated in the adhesive layer forming step. Therefore, in Example 4, only the adhesive layer forming step and the inserting step will be described.

  6 is an explanatory view schematically showing an adhesive layer forming step and an inserting step in the manufacturing method of Example 4. FIG.

(Adhesive layer forming process)
The adhesive in the manufacturing method of Example 4 is an adhesive that can be softened by heating in the same manner as the adhesive described in Example 1. In the manufacturing method of Example 4, the adhesive layer 4 was applied and formed on the inner peripheral surface 51 of the battery holding unit 50. The thickness of the adhesive layer 4 is larger than the thickness of the adhesive space 20. In addition, the formation method of the contact bonding layer 4 is not restricted to this, A various method is employable. For example, the cylindrical adhesive layer 4 having a diameter slightly larger than the inner diameter of the battery holding unit 50 is molded in advance, the outer peripheral surface of the adhesive layer 4 is heated and softened, and press-fitted into the battery holding unit 50. May be cooled and solidified to be integrated with the inner peripheral surface 51 of the battery holding unit 50. Alternatively, the cylindrical adhesive layer 4 may be integrally formed on the inner peripheral surface 51 of the battery holding unit 50 by insert molding.

  After the formation of the adhesive layer 4, the inner peripheral surface 4b side of the adhesive layer 4 was heated by the heater 95 as shown in the left part of FIG. Then, the adhesive layer 4 was softened, and the portion on the inner peripheral surface 4 b side of the adhesive layer 4 became lower in viscosity than the portion on the outer peripheral surface 4 a side of the adhesive layer 4. By this step, as shown in the second part from the left in FIG. 6, the low-viscosity layer (low-viscosity adhesive layer 45) constituting the inner peripheral part of the cylindrical adhesive layer 4 and the cylindrical adhesive A high-viscosity layer (high-viscosity adhesive layer 41) constituting the outer peripheral side portion of the layer 4 was formed.

  At this time, at least a portion of the high-viscosity adhesive layer 41 on the low-viscosity adhesive layer 45 side was higher in viscosity than the low-viscosity adhesive layer 45, but was in a plastic state and could be deformed. Further, the viscosity of the adhesive layer 4 gradually changed from the inner peripheral side portion toward the outer peripheral side portion, and the boundary portion between the low viscosity adhesive layer 45 and the high viscosity adhesive layer 41 was ambiguous. However, at least on the inner peripheral surface 4b of the adhesive layer 4, the low-viscosity adhesive layer 45 was continuously formed over the entire circumference in the circumferential direction. Further, on the outer peripheral side of the low-viscosity adhesive layer 45, the high-viscosity adhesive layer 41 was continuously formed over the entire circumference in the circumferential direction. Through the above steps, the adhesive layer 4 having the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45 was formed on the inner peripheral surface 51 of the battery holding unit 50.

  Note that the adhesive layer 4 does not necessarily need to be composed of only the low-viscosity adhesive layer 45 and the high-viscosity adhesive layer 41. That is, the adhesive that remains solidified without being softened during the heating may remain in the portion of the adhesive layer 4 on the outer peripheral surface 4a side. That is, at this time, at least the inner peripheral surface of the adhesive layer may be softened.

(Insertion process)
After the adhesive layer forming step, the battery cell 1 was axially aligned with the battery holding unit 50 and inserted into the battery holding unit 50. The thickness of the adhesive layer 4 including the low viscosity adhesive layer 45 and the high viscosity adhesive layer 41 is larger than the thickness of the adhesive space 20. For this reason, also in the manufacturing method of Example 4, when the battery cell 1 is inserted in the battery holding part 50, the high-viscosity adhesive layer 41 and the low-viscosity adhesive layer 45 are in pressure contact. Furthermore, the low-viscosity adhesive layer 45 that is easily deformed and has high fluidity comes into contact with the battery cell 1 that is the counterpart material. Therefore, also in the manufacturing method of Example 4, the adhesive layer 4 is filled in the adhesive space 20 without a gap. That is, in the manufacturing method of Example 4, in the insertion step, the high-viscosity adhesive layer 41 (that is, the outer peripheral surface side portion) and the low-viscosity adhesive layer 45 (that is, the inner peripheral surface side portion) in the adhesive layer 4 are mutually connected. By making it act, the adhesion layer 4 can be filled into the adhesion space 20 without a gap.

  In the adhesive layer forming step of the manufacturing method of Example 4, the adhesive layer 4 is formed on the battery holding unit 50, but the adhesive layer 4 may be formed on the battery cell 1. In this case, if the cylindrical adhesive layer 4 is formed on the outer peripheral surface 11 of the battery cell 1 and the adhesive layer 4 is heated and softened from the outer peripheral surface side, the low-viscosity adhesive layer 45 is formed on the outer peripheral side, and the inner peripheral surface The adhesive layer 4 having the high-viscosity adhesive layer 41 formed on the side is obtained. Then, if the battery cell 1 having the adhesive layer 4 is inserted into the battery holding part 50, the low-viscosity adhesive layer 45 comes into contact with the inner peripheral surface 51 of the battery holding part 50 that is the counterpart material. Similar to the method, the adhesive layer 4 can be filled in the adhesive space 20 without a gap.

(Example 5)
Example 5 relates to the first manufacturing method of the present invention. In the manufacturing method of Example 5, the adhesive layer (first adhesive layer 46) formed on the outer peripheral surface 11 of the battery cell 1 in the adhesive layer forming step, and the adhesive layer (first adhesive layer 46) formed on the inner peripheral surface 51 of the battery holding unit 50. And the second adhesive layer 47) have the same viscosity. Otherwise, the manufacturing method of Example 5 is substantially the same as the manufacturing method of Example 1. However, since the first adhesive layer 46 and the second adhesive layer 47 have the same viscosity, the behavior of the adhesive layer 4 in the insertion step of the manufacturing method of Example 5 is different from that of the manufacturing method of Example 1. Therefore, in Example 5, only the adhesive layer forming step and the inserting step will be described. FIG. 7 is a cross-sectional view schematically showing a state where the battery module of Example 5 is cut at the same position as the XX position in FIG. 1. FIG. 8 is an explanatory view schematically showing an adhesive layer forming step and an inserting step in the manufacturing method of Example 5.

(Adhesive layer forming process)
In the adhesive layer forming step in the manufacturing method of Example 5, adhesives having the same composition and the same viscosity were applied to the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 51 of the battery holding unit 50, respectively. As shown in the left part of FIG. 8, the first adhesive layer 46 is formed on the outer peripheral surface 11 of the battery cell 1 and the second adhesive layer 47 is formed on the inner peripheral surface 51 of the battery holding portion 50 by this process. . The first adhesive layer 46 and the second adhesive layer 47 have the same composition and the same viscosity. Further, the first adhesive layer 46 was formed on the entire fixing region Z on the outer peripheral surface 11 of the battery cell 1. The second adhesive layer 47 was formed on the entire inner peripheral surface 51 of the battery holding unit 50. When the first adhesive layer 46 and the second adhesive layer 47 have the same viscosity, the first adhesive layer 46 is preferably formed over the entire length in the axial direction Y of the fixing region Z. At this time, the axial length of the second adhesive layer 47 is more preferably the same as the axial length of the first adhesive layer 46. As will be described later, in this case, substantially the same force acts on the first adhesive layer 46 and the second adhesive layer 47 in the insertion step, and the first adhesive layer 46 and the second adhesive layer 47 have substantially the same axial direction. This is because it can be spread only to the length. Also in the manufacturing method of Example 5, the sum of the thickness of the first adhesive layer 46 and the thickness of the second adhesive layer 47 was larger than the thickness of the adhesive space 20.

(Insertion process)
Next, the battery cell 1 having the first adhesive layer 46 was inserted into the battery holding unit 50 having the second adhesive layer 47. Therefore, at this time, the first adhesive layer 46 and the second adhesive layer 47 were in pressure contact as shown in the center portion in FIG. In the manufacturing method of Example 5, the viscosity of the first adhesive layer 46 and the viscosity of the second adhesive layer 47 were substantially the same. That is, the ease of deformation of the first adhesive layer 46 and the second adhesive layer 47 was comparable. Therefore, at this time, the second adhesive layer 47 is pressed and deformed by the first adhesive layer 46, and the first adhesive layer 46 is pressed and deformed by the second adhesive layer 47, and the first adhesive layer 46 and the second adhesive layer are deformed. The bonding space 20 was filled while being spread on the layer 47.

  More specifically, the deformation amount of the first adhesive layer 46 gradually increases from the insertion rear end side toward the insertion distal end side. That is, as shown in FIG. 7, the first adhesive layer 46 has a tapered shape in which the thickness gradually decreases from the insertion rear end side toward the insertion distal end side, and the second adhesive layer 47 is the first adhesive layer. 46 has a shape that is substantially complementary to 46, that is, a tapered shape in which the thickness gradually decreases from the insertion leading end side toward the insertion rear end side.

  In other words, as shown in the right part of FIG. 8, when the battery cell 1 is inserted into the battery holding part 50, the first adhesive layer 46 and the second adhesive layer 47 are in pressure contact with each other at the boundary surface. While sliding, it deforms to the same extent. Therefore, the second adhesive layer 47 functions as a filler filled between the inner peripheral surface 51 of the battery holding unit 50 and the outer peripheral surface 46a of the first adhesive layer 46, and the first adhesive layer 46 is a second adhesive. It functions as a pressing material for spreading the layer 47. The first adhesive layer 46 also functions as a filler filled between the outer peripheral surface 11 of the battery cell 1 and the inner peripheral surface 47b of the second adhesive layer 47, and the second adhesive layer 47 is the first adhesive layer. It also functions as a pressing material for spreading the layer 46. Further, the second adhesive layer 47 also functions as a lubricant for the first adhesive layer 46, and the first adhesive layer 46 also functions as a lubricant for the second adhesive layer 47.

  For this reason, also in the manufacturing method of Example 5, the adhesive layer 4 composed of the first adhesive layer 46 and the second adhesive layer 47 is in the adhesive space 20 provided between the battery holding part 50 and the battery cell 1. Fills without gaps. In other words, in the manufacturing method of Example 5, the first adhesive layer 46 and the second adhesive layer 47 interact with each other in the insertion step, so that the adhesive layer 4 is filled in the adhesive space 20 without any gap. Can do.

  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 4: adhesive layer 5: holder 11: outer peripheral surface of battery cell 46: first adhesive layer 47: second adhesive layer 50: battery holding portion 51: inner peripheral surface of battery holding portion

Claims (5)

A preparation step of preparing a holder and battery cell having a hole-shaped battery holding portion, and an adhesive layer forming step of forming an adhesive layer made of an adhesive on the outer peripheral surface of the battery cell and the inner peripheral surface of the battery holding portion And an insertion step of inserting the battery cell into the battery holding portion of the holder,
In the adhesive layer forming step,
The first adhesive layer formed on the outer peripheral surface of the battery cell and the second adhesive layer formed on the inner peripheral surface of the battery holding portion are made of an adhesive having the same composition and the same viscosity, or the same composition and a different viscosity. Configure
In at least a partial region of the outer peripheral surface of the battery cell in the axial direction, the first adhesive layer is formed over the entire outer periphery of the battery cell;
By forming the second adhesive layer over the entire circumference of the inner peripheral surface of the battery holding part in at least a partial region in the axial direction on the inner peripheral surface of the battery holding part,
The battery module manufacturing method, wherein in the inserting step, the first adhesive layer and the second adhesive layer are pressed and deformed at a boundary surface . A preparation step of preparing a holder and battery cell having a hole-shaped battery holding portion, and an adhesive layer forming step of forming an adhesive layer made of an adhesive on the outer peripheral surface of the battery cell or the inner peripheral surface of the battery holding portion And an insertion step of inserting the battery cell into the battery holding portion of the holder,
The adhesive comprises a high-viscosity adhesive, and a low-viscosity adhesive having the same composition as the high-viscosity adhesive and having a lower viscosity than the high-viscosity adhesive,
In the adhesive layer forming step,
First, a high-viscosity adhesive layer made of the high-viscosity adhesive is formed over the entire circumference of the outer peripheral surface of the battery cell in at least a partial region of the outer peripheral surface of the battery cell, and then the high-viscosity adhesive Forming a low-viscosity adhesive layer composed of the low-viscosity adhesive over the entire circumference of the outer peripheral surface of the high-viscosity adhesive layer in at least a partial region of the outer peripheral surface of the layer;
Or
First, in at least a partial region of the inner peripheral surface of the battery holding portion in the axial direction, a high viscosity adhesive layer made of the high viscosity adhesive is formed over the entire inner peripheral surface of the battery holding portion, and then In at least a part of the axial direction of the inner peripheral surface of the high-viscosity adhesive layer, by forming a low-viscosity adhesive layer made of the low-viscosity adhesive over the entire circumference of the high-viscosity adhesive layer,
The battery module manufacturing method, wherein at least the low-viscosity adhesive layer is deformed in the insertion step. A preparation step of preparing a holder and battery cell having a hole-shaped battery holding portion, and an adhesive layer forming step of forming an adhesive layer made of an adhesive on the outer peripheral surface of the battery cell or the inner peripheral surface of the battery holding portion And an insertion step of inserting the battery cell into the battery holding portion of the holder,
In the adhesive layer forming step,
First, in at least a partial region of the outer peripheral surface of the battery cell in the axial direction, the adhesive layer is formed over the entire outer periphery of the battery cell, and then the adhesive layer is heated from the outer peripheral surface side. , Or lower the viscosity of the outer peripheral surface side portion of the adhesive layer compared to the inner peripheral surface side portion,
Or
The adhesive layer is formed over the entire circumference of the inner peripheral surface of the battery holding portion in at least a partial region of the inner peripheral surface of the battery holding portion, and then the adhesive layer is heated from the inner peripheral surface side. By making the inner peripheral surface side portion in the adhesive layer lower in viscosity than the outer peripheral surface side portion,
The battery module manufacturing method, wherein, in the inserting step, at least the low-viscosity portion of the adhesive layer is deformed . The battery module manufacturing method according to claim 2, wherein the high-viscosity adhesive and the low-viscosity adhesive are made of an adhesive having the same composition, and the viscosity is adjusted by temperature control. The high-viscosity adhesive and the low-viscosity adhesive are composed of an adhesive having the same composition including a base material and a curing agent, and the viscosity is controlled by controlling the elapsed time after the start of the reaction between the base material and the curing agent. The method for producing a battery module according to claim 2, which is adjusted.

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