JP4728758B2 - Electric device module manufacturing method and electric device module - Google Patents

Description

  The present invention relates to an electric device module in which a predetermined number of electric devices such as film-clad batteries are housed in a case, and a manufacturing method thereof.

  In recent years, for example, a lightweight and small battery has been developed as a power source for driving a motor of an electric vehicle, and one of them is a collection of a plurality of thin film-covered batteries (hereinafter also referred to as “battery cells”). An assembled battery is known. Patent Document 1 shows an example in which a plurality of battery cells are assembled to form one assembled battery. Hereinafter, this will be described with reference to FIG.

  As shown in FIG. 12, in the assembled battery 101, for example, four battery cells 120 functioning as lithium secondary batteries are electrically connected so as to be connected in series. Each battery cell 120 is formed by encapsulating a battery element (not shown) that generates a predetermined electromotive force with a laminate film, and electrode tabs 108a and 108b for a positive electrode and a negative electrode are drawn out from the outer periphery of the film. Yes.

These electrode tabs are partially overlapped at the tab connecting portion 110 and joined by, for example, ultrasonic welding or laser welding. Adjacent battery cells 120 are electrically connected to each other using the bus bar 112. With such a configuration, an electromotive force corresponding to four battery cells can be obtained in the assembled battery 101.
JP 2004-111098 A

  By the way, when the electrode tabs 108a and 108b are brought into close contact with each other (see FIG. 13), it is necessary to take some measures so that the electrode tabs are not corroded at the connection portion.

  That is, the material of the electrode tabs 108a and 108b is appropriately selected according to the polarity, and is generally composed of different materials (for example, aluminum for the positive electrode and copper for the negative electrode). Therefore, in the tab connection part 110 shown in FIG. 13, different metals are in contact with each other. In such a configuration in which different metals are in contact with each other, if current flows in a state where liquid (for example, water) enters the contact surfaces of the electrode tabs, an electric corrosion phenomenon may occur, and the electrode tabs may be corroded. It is. Corrosion of the electrode tab causes a decrease in electrical performance and a shortened life of the assembled battery. Therefore, preventing liquid from entering between the electrode tabs is important for achieving high reliability of the assembled battery.

  In addition, when it comes to aluminum and the like, even if they are not different metals, that is, even if they are the same kind of metals, electric corrosion may occur. Therefore, the above problem is not limited to the case where battery cells are connected in series. This is also a problem that can occur when connected in parallel. The above-mentioned problems are not limited to the film-clad battery as shown in FIG. 12, but can also occur in the same manner with respect to various electric devices that may cause a problem of electrolytic corrosion at the connection portion between the electrode tabs. .

  In addition, for example, when joining the electrode tabs by welding or the like, it is naturally preferable that the joining can be performed with good workability, and even when any countermeasure is taken against the problem of electrical contact, the countermeasure It is preferable that the above can be performed with good workability.

  The present invention has been made in view of the above-described problems, and its purpose is to connect electrode tabs with good workability, and to solve the problem of electrolytic corrosion without complicated work. An object of the present invention is to provide an electrical device module manufacturing method capable of taking measures. Another object of the present invention is to provide an electric device module having a configuration capable of suitably utilizing the manufacturing method of the present invention.

  In order to achieve the above object, the method for manufacturing an electric device module according to the present invention is such that an electric device in which a sheet-like electrode tab is drawn out from the outer peripheral portion is planar so that the tip sides of the electrode tabs overlap each other. A method of manufacturing an electrical device module which is accommodated in a case in a lined state and in which an overlapping portion between the electrode tabs is joined to a bus bar disposed between the electrical devices, A step of disposing the bus bar in the bar groove provided in the step, and a step of applying a first sealing agent forming a part of a sealing member for hermetically sealing the overlapping portion along both side edges of the upper surface of the bus bar. And the step of arranging the battery device such that the tip sides of the electrode tabs overlap each other on the top surface of the bus bar, and the electrode tab on the top surface of the bus bar. A step of welding and joining the overlapping portions of the first sealing member, and then a second sealing agent that forms the remaining part of the sealing member, wherein the second sealing agent is in the vicinity of both side edges of the electrode tab. Applying to the region covering the overlapped portion so as to come into contact with the sealing agent.

  According to such a manufacturing method of the present invention, electrical connection between electrical devices, that is, connection between electrode tabs is performed in a state where the electrical devices are arranged in a plane, so that the workability can be improved. It becomes possible. In addition, the overlapping part of the electrode tabs is hermetically sealed by a sealing member so as not to cause the problem of electric corrosion. The formation process of this sealing member is efficiently performed for the following reason. It has come to be.

  That is, in order to hermetically seal the overlapping portion, it is necessary to wrap the sealing agent on both the upper and lower surfaces of the electrode tab. However, if the sealing agent is applied in two steps as in the present invention, Work is relatively easy. In the present invention, the first sealing agent applied first is applied so as to contact the bus bar, and therefore heat generated during welding is transmitted to the first sealing agent via the bus bar. The Therefore, this heat is used to promote the hardening of the sealing agent. Thereby, for example, it becomes possible to omit a process that has been performed only for curing the sealant.

  In the present invention, in the step of applying the first sealant, the first sealant may be applied so as to come into contact with both the bus bar and the case. Thereby, the 1st sealing agent will function also as a member which fixes a bus bar to a case. Further, the first and second sealing agents may be made of the same material and made of a thermoplastic resin.

  In addition, the welding and joining step may be performed while supplying a coolant to a flow passage formed in the bus bar and cooling the bus bar and the electrode tab disposed on the bus bar.

  The electric device module of the present invention that can be manufactured by applying the present invention is flat so that the electric devices from which the sheet-like electrode tabs are drawn out from the outer peripheral portion overlap each other. And an electric device module in which the electrode tabs are accommodated in a case and are joined to a bus bar disposed between the electric devices. The first sealant applied to the lower surface side of the electrode tab in a state along the both side edges of the upper surface of the bus bar, and the first sealant in contact with the first sealant in the vicinity of both side edge portions of the electrode tab. 2 is hermetically sealed.

  The number of electrical devices accommodated in the case is not limited. For example, two or more rows of electrical devices composed of two or more electrical devices arranged in one direction may be adjacent to each other. In this case, the bus bar may electrically connect the electrode tab of one electric device group and the electrode tab of the other electric device group to each other. The bus bar may be formed with a flow passage capable of supplying a refrigerant.

  As described above, according to the present invention, since the electrode tabs are connected to each other on the case, the electrode tabs can be connected with good workability, and the sealing agent is applied in two portions. In addition, since the heat generated during welding is used to accelerate the curing of the sealing agent, a seal member for hermetic sealing can be formed efficiently and efficiently. Become.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing a battery cell in a single state. FIG. 2 is an exploded perspective view of a battery module in which two battery cells are assembled, and FIG. 3 is an external perspective view of the assembled battery according to the present embodiment.

  As shown in FIG. 1, the battery cell 20 alone has a thin battery element 22 that outputs a predetermined electromotive force (for example, 3.6 V) sealed and sealed with an exterior film 24. A sealing portion 23 in which the films are fused to each other is formed. From both sides (each short side) of the sealing portion 23, a sheet-like positive electrode tab 25a and a negative electrode tab 25b are drawn out.

  More specifically, the electrode tabs 25a and 25b have a thickness of about 50 μm to 300 μm, for example. Although depending on the material, the electrode tabs 25a and 25b are provided with flexibility by setting the thickness of the electrode tab to this level.

  The electrode tabs 25a and 25b are both connected to the internal battery element 22, and a material suitable for each electrode tab is selected according to the polarity. That is, the material of the electrode tab 25a for the positive electrode is selected from aluminum, an aluminum alloy, or any of those subjected to alumite treatment or resin coating (referred to as “aluminum-based material”). On the other hand, the material of the electrode tab 25b for the negative electrode is selected from copper, a copper alloy, or any of those plated with metal (for example, nickel plating) (referred to as “copper-based material”). .

  As shown in FIG. 2, the battery module 50 of the present embodiment is configured to accommodate two battery cells 20 in one case 30. Further, by stacking the battery modules 50 thus modularized in a plurality of stages, a final assembled battery 80 is configured as shown in FIG.

  The case 30 (see FIG. 2) includes one lower case 35 and two lid members 33A and 33B, and each member is made of, for example, a resin material. The lower case 35 has two housing portions 36A and 36B in which one battery cell 20 is disposed, and one bar groove 37 is formed between the housing portions 36A and 36B. As will be described later, a bus bar 15 made of a metal material is disposed in the bar groove 37, and a tab connecting portion 28 between the electrode tabs is positioned on the upper surface of the bus bar 15. Yes.

  The bus bar 15 functions as a voltage extraction terminal corresponding to each battery cell 20 by being connected to the tab connection portion 28 in this way. That is, although not shown, by connecting a predetermined electric circuit to the bus bar, the voltage of each battery cell 20 is managed, or even if an abnormality occurs in one battery cell 20, the entire assembled battery 80 It is possible to provide a fuse so as not to damage the circuit.

  The lid members 33A and 33B are formed in contour shapes corresponding to the accommodating portions 36A and 36B, respectively. By attaching the lid member to the accommodating portion, one internal space is formed between the two members, and the battery cell is arranged in this internal space. Although not particularly shown in FIG. 2 and the like, the battery cells may be fixed in the internal space using, for example, urethane foam.

  FIG. 4 shows a state where the two battery cells 20 and the bus bar 15 are arranged in the lower case 35. As shown in the figure, when two battery cells are arranged, the tip end sides of the electrode tabs overlap each other at the center of the case, and this overlapping portion is a tab connection portion 28. Further, the electrode tabs 25a and 25b positioned on the outer side extend from the case by a predetermined length. In this way, the electrode tabs 25a and 25b extending from the case are connected to each other at the side surface of the assembled battery as shown in FIG.

  FIG. 5 is a cross-sectional view specifically showing the structure of the tab connecting portion 28 and its periphery. Although not shown in FIGS. 1 to 4, the tab connecting portion 28 is finally surrounded by the seal member 12, thereby making it airtight and allowing entry of liquid or the like from the outside. It is prevented. The sealing member 12 is divided into a lower sealing agent 12a located on the lower side of the electrode tab and an upper sealing agent 12b located on the upper side of the electrode tab, and these are applied and cured in different processes as will be described later. It is a thing.

  The sealing agents 12a and 12b are not particularly limited as long as the tab connection part 28 can be satisfactorily hermetically sealed. It may be of a physical property that solidifies again. Alternatively, it may have a predetermined fluidity in the initial state, and curing may be accelerated by heating.

  The material of the sealing agent may be, for example, a thermoplastic material mainly composed of polypropylene, modified polypropylene, polyethylene, or modified polyethylene. Further, the sealing agents 12a and 12b can be made of different materials, but in the present embodiment, both are made of the same material.

  As shown in FIG. 3, the assembled battery 80 is configured by stacking the cases 30, and therefore, the device is devised so that the cases 30 are mutually positioned when they are stacked. . That is, an engagement convex portion 38A protruding from another part is formed on the lower surface of the case 30, and the engagement convex portion 38A is engaged with an engagement concave portion 38B provided on the groove upper side. It has become. In addition, the case 30 is formed symmetrically with respect to the engaging structural portions 38A and 38B. As a result, even when the cases 30 are alternately stacked in different directions (directions in which the electrode tabs 25a of one case and the electrode tabs 25b of the other case are on the same side), The outer shape is not changed.

  Next, the manufacturing method of the assembled battery which concerns on this embodiment which has the above structures is demonstrated. In addition, since this invention has the main characteristics especially in the process of connecting electrode tabs among manufacture of an assembled battery, the following description shall mainly describe this process. In the following description, laser welding will be described as an example, but the present invention is not limited to this. Moreover, in the following description, what has fluidity | liquidity in the initial state is used as sealing agent 12a, 12b.

  First, as shown in FIG. 6A, the bus bar 15 is disposed in the bar groove 37 of the lower case 35 prepared in advance. Then, the lower sealant 12 a is applied so as to come into contact with both ends of the upper surface of the bus bar and the upper end of the side wall of the bar groove 37.

  More specifically, as shown in FIG. 7, the sealing agent 12a is applied along both side edges of the upper surface of the bus bar and more than the region where the electrode tabs are arranged (shown by broken line hatching in FIG. 7). It is applied over a wide range. By applying in this way, when the electrode tab is arranged on the bus bar, a part of the sealing agent 12a is exposed in the vicinity of the electrode tab side edge portion without being covered with the electrode tab.

  Next, as shown in FIG. 6B, the two battery cells 20 are arranged in the lower case 35. In this state, the tip sides of the electrode tabs 25a and 25b overlap each other on the bus bar 15.

  Next, as shown in FIG. 6C, the laser beam is irradiated to the overlapping portion of the electrode tabs while pressing the two electrode tabs against the bus bar 15 using, for example, a jig 90. In the part irradiated with the laser beam, the members of the two electrode tabs locally melt. Further, the energy of the laser beam is also transmitted to the upper surface of the bus bar, whereby the upper surface of the bus bar is also locally melted. Accordingly, in the present embodiment, the two electrode tabs 25a and 25b are joined to the upper surface of the bus bar and are electrically connected to each other.

  By the way, in this process, when the bus bar 15 etc. are heated at the time of welding, the sealing agent 12a which touched them will also be indirectly heated, and fluidity | liquidity will improve. Accordingly, when applied in the previous step, the sealing agent 12a may flow so as to fill the gap 3 even if the gap 3 exists as shown in FIG. 6B, for example. Be expected. However, even if such voids 3 are scattered in the seal member, no adverse effect occurs because liquid or the like does not enter from the outside if the seal member 12 as a whole is airtight.

  When the laser irradiation is completed, the lid members 33A and 33B are then attached on the lower case 35 as shown in FIG. Thereafter, the sealing agent 12b is applied and cured on the two electrode tabs. As a result, the final seal member 12 is formed and the tab connection portion 28 is hermetically sealed. And the battery module 50 produced in this way is laminated | stacked like FIG. 3, and the assembled battery 80 is finally completed by connecting each electrode tabs.

  In the process of FIG. 6D, if the sealing agent 12b is applied in a state where the heat during laser welding still remains on the electrode tab, the heat can be used for curing the sealing agent 12b. Therefore, it is efficient. In order to make the tab joint portion 28 airtight, the sealing agent 12b is applied so that the sealing agent 12b comes into contact with the sealing member 12a that is exposed without being covered with the electrode tab. is important.

  Further, the assembly from the battery module 50 to the assembled battery 80 may be as follows, for example. That is, first, the three battery modules 50 are arranged in a row so that the electrode tabs partially overlap each other. Next, in this state, the overlapping portions of the electrode tabs are sequentially laser welded, and the three battery modules 50 are electrically connected. Thereafter, each battery module 50 is alternately folded in a ninety-nine fold form to obtain a final assembled battery 80.

  In the assembled battery manufacturing method of the present embodiment described above, since the tab joint portion 28 between the electrode tabs is sealed by the sealing member 12, liquid or the like is prevented from entering between the electrode tabs. The tab corrosion due to electric corrosion is less likely to occur.

  In addition, as described with reference to FIG. 6C, in this manufacturing method, heat at the time of laser welding is transmitted to the lower sealing agent 12a applied in advance. Although depending on the material of the sealant to be used, since heat at the time of laser welding is transmitted in this way, it becomes possible to promote hardening of the sealant 12a by using this heat. . That is, since the heat generated inevitably during laser welding is actively used to cure the sealing agent 12a, a special process only for curing the sealing agent is not required.

  The lower sealing agent 12a also functions as a member for fixing the bus bar 15 to the case in addition to the function of hermetically sealing the tab connecting portion. Therefore, a special member for fixing the bus bar 15 is not necessary.

  In the above, the connection between the electrode tabs using laser welding has been described. However, as a method for connecting the electrode tabs, other welding such as ultrasonic welding can also be used. Further, the method described with reference to FIG. 6 is merely an example of the present invention, and can be appropriately changed as necessary. For example, the lid members 33A and 33B may be attached before the laser welding.

  In the process shown in FIG. 6A, the lower sealing agent 12a is applied so as to contact both the bus bar 15 and the case 35. However, the present invention is not limited to this. For example, It is also possible to apply only to both side edge portions on the upper surface of the bus bar. However, if the sealing agent 12 a is used for fixing the bus bar 15, the sealing agent 12 a needs to be in contact with the case 35. In this regard, even when the sealing agent is applied only to both side portions of the bus bar upper surface (without contacting the case) as described above, when the battery cell 20 is disposed in the next step, If the sealing agent is pressed against the case side by the electrode tabs 25a and 25b, and the sealing agent comes into contact with both the bus bar and the case, the same action can be obtained.

  Further, the bar groove 37 may be provided not only in the central portion of the case but also in the vicinity of the end portion of the case 30A as shown in FIG. In the bar groove 37A, the bus bar 15 is arranged as described above, and the electrode tabs are joined to each other on the upper surface of the bus bar. Although the seal member is not shown in FIG. 8, the electrode tabs are joined to each other in substantially the same process as described above, and when the seal member is applied and cured, the case 30A is folded back as shown by the arrow in the figure. Thereby, it will be in the state where two cases 30A were laminated.

  Next, the number of battery cells 20 arranged in the case in the present invention is not particularly limited. For example, as illustrated in FIG. 9, battery cell groups including three battery cells 20 arranged in one direction (lateral direction in the drawing) may be arranged in two rows adjacent to each other in the vertical direction. In the form of FIG. 9, the electrode tab of one battery cell group and the electrode tab of the other battery cell group are electrically connected to each other by a bus bar and are in a state of 2 parallel 3 series.

(Second Embodiment)
The present invention may be, for example, as shown in FIG. 10 in addition to the embodiment described above.

  The battery module 51 shown in FIG. 10 is obtained by changing the bus bar 15 of the battery module 50 in the first embodiment to a bus bar 15 ′ made of a hollow member. Since the other structural portions are the same as those in the first embodiment, the same structural portions are denoted by the same reference numerals as in FIGS. 1 to 9 and description thereof is omitted.

  Note that the battery module 51 of the present embodiment is intended to solve the following problems. That is, as described with reference to FIG. 6C, when the electrode tabs 25 are welded to each other using a laser beam, the electrode tabs 25 are heated by irradiation with the laser beam. If the electrode tab 25 becomes high temperature, the resin in the sealing portion 23 (see FIG. 10) is softened due to the influence of the heat, and in some cases, the airtightness of the sealing portion 23 may be impaired.

As a measure for preventing this, the length L ₂₅ of the electrode tab is set longer. As a result, the distance from the portion irradiated with the laser beam to the sealing portion 23 is increased, and the temperature of the electrode tab 25 in the sealing portion 23 is also unlikely to increase. However, if the electrode tabs 25 are lengthened in this way, the interval between the battery cells 20 is naturally widened, and as a result, the entire battery module is enlarged. Therefore, in this embodiment, the ventilation path 15a is provided in the bus bar 15 ′, and the ventilation path 15a is used to suppress the temperature rise of the electrode tab during laser beam irradiation.

  First, the bus bar 15 'will be described. The bus bar 15' is made of a tubular member having a rectangular cross section, and an air passage 15a is formed therein. Cooling air is supplied into the ventilation path 15a by a blowing means (not shown). More specifically, as shown in FIG. 10A, the cooling air is supplied to the air vent 15a when the electrode tabs are irradiated with laser beams. As a result, the bus bar 15 ′ is cooled, so that the electrode tab 25 disposed on the bus bar is cooled accordingly, and the temperature rise of the electrode tab 25 in the sealing portion 23 is also suppressed.

In this embodiment, since the temperature rise of the electrode tab 25 at the time of laser beam irradiation is suppressed in this manner, softening of the resin or the like in the sealing portion 23 becomes difficult to occur, and the airtightness of the sealing portion 23 is impaired. The possibility is also reduced. Therefore, it is not necessary to set the electrode tab length L ₂₅ longer in consideration of the adverse effect on the sealing portion due to heat, and as a result, the battery module as a whole can be downsized.

  The process after the laser beam irradiation, that is, the process of applying and curing the remaining sealing agent 12b (see FIG. 10B) can be performed in the same manner as in the first embodiment. Further, when the battery module 51 is used, if the cooling air is made to flow through the ventilation path 15a of the bus bar 15 ', the temperature increase of the electrode tab 25 during use can be suppressed.

  In the above description, the bus bar 15 ′ has been described as a tubular member. However, the bus bar is not limited thereto, and may be a member having a U-shaped cross section, for example. By arranging the U-shaped bus bar so that the opening side thereof faces the lower case 35, a ventilation path is formed between the bus bar and the case 35. Using this ventilation path, the same as above This is because the effect can be obtained.

  Although not particularly limited, the bus bar may be more specifically as shown in FIG. In the bus bar 15 ″ shown in FIG. 11, an R portion 19 is formed in a part of the cross-sectional shape. In addition, a terminal joining screw 17 for connecting an electric circuit (for example, a connecting cord: not shown) is provided at one end (left side in the drawing) of the bus bar 15 ″. The connecting cord is configured to be attached to the terminal joining screw 17 without closing the ventilation path 15a. The cooling air may be introduced from the end portion on the side where the terminal bonding screw 17 is provided, or may be introduced from the end portion on the opposite side.

  In the first and second embodiments described above, the battery cell 20 whose outer package is the outer film 24 is described as an example. However, as the battery cell (electric device), a sheet-like electrode tab is drawn out. For example, the battery element 22 (electric device element) may be hermetically sealed using a can or the like instead of the exterior film. Although not described in detail in the above description, the battery element 22 used in the battery cell is a lithium ion secondary battery, specifically, a positive electrode active material such as lithium-manganese composite oxide or lithium cobaltate. Electrode containing lithium salt with a positive electrode plate coated on both sides of aluminum foil and a negative electrode plate coated on both sides of copper foil with a carbon material that can be doped / undoped with lithium. The liquid may be impregnated. However, in addition to lithium ion secondary batteries, the battery elements may be battery elements of other types of chemical batteries such as nickel metal hydride batteries, nickel cadmium batteries, lithium metal primary batteries or secondary batteries, and lithium polymer batteries. Good. In addition, the battery element is not limited to a laminated type, and a belt-like positive electrode side active electrode and a negative electrode side active electrode are stacked with a separator interposed therebetween, wound, and then compressed into a flat shape. A wound type having a structure in which negative electrode side active electrodes are alternately stacked may be used. Furthermore, as an electric device element, an element that stores and outputs (charges / discharges) electric energy, such as a capacitor element exemplified by a capacitor such as an electric double layer capacitor or an electrolytic capacitor, may be used. .

It is a perspective view which shows a battery cell in the single-piece | unit state. It is a disassembled perspective view of the battery module which assembled two battery cells. It is an external appearance perspective view of the assembled battery which concerns on this embodiment. It is a top view which shows the state by which the two battery cells and the bus bar are arrange | positioned at the lower case. It is sectional drawing which shows the structure of a tab connection part and its periphery concretely. It is process drawing which shows an example of the manufacturing method of this invention. It is a perspective view which shows the application | coating area | region of the lower side sealing agent. It is a figure for demonstrating the other structural example regarding a case, and the superimposition process of cases. It is a top view which shows typically the other example of arrangement | positioning of a battery cell. It is sectional drawing which shows the structure of the battery module which concerns on 2nd Embodiment, and its manufacturing method. It is a figure which shows an example of the bus bar which can be utilized for 2nd Embodiment. It is a perspective view which shows an example of the conventional assembled battery. It is a figure for demonstrating the problem in the connection part of electrode tabs.

Explanation of symbols

3 Space part 15, 15 ', 15''Bus bar 15a Ventilation path 17 Terminal joining screw 19 R part 20 Battery cell 22 Battery element 23 Sealing part 24 Exterior film 25a, 25b Electrode tab 28 Tab connection part 30, 30A Case 33A, 33B Lid member 35 Lower case 36A, 36B Housing part 37, 37A Bar groove 38A Engaging convex part 38B Engaging concave part 50, 51 Battery module 80 Assembly battery 90 Jig

Claims (9)

The electrical device from which the sheet-like electrode tab is drawn out from the outer peripheral portion is accommodated in the case in a state of being arranged in a plane so that the tip sides of the electrode tabs overlap each other, and the electrode tabs are overlapped with each other. A method of manufacturing an electrical device module in which a mating portion is joined to a bus bar disposed between the electrical devices,
Disposing the bus bar in a bar groove provided in the case;
Applying a first sealing agent forming a part of a sealing member for hermetically sealing the overlapping portion along both side edges of the upper surface of the bus bar;
Placing the battery device such that the tip sides of the electrode tabs overlap on the upper surface of the bus bar;
A step of welding and joining the overlapping portions of the electrode tabs on the bus bar upper surface;
Thereafter, the second sealing agent constituting the remaining part of the sealing member is overlapped so that the second sealing agent contacts the first sealing agent in the vicinity of both side edges of the electrode tab. And a step of applying to a region covering the part.   2. The method of manufacturing an electric device module according to claim 1, wherein in the step of applying the first sealant, the first sealant is applied so as to come into contact with both the bus bar and the case. .   The method for manufacturing an electric device module according to claim 1, wherein the first and second sealing agents are made of the same material and are made of a thermoplastic resin.   4. The welding process according to claim 1, wherein the welding is performed while supplying a coolant to a flow passage formed in the bus bar and cooling the bus bar and the electrode tab disposed on the bus bar. 5. The manufacturing method of the electrical device module of Claim 1.   The method of manufacturing an electric device module according to any one of claims 1 to 4, wherein the welding and joining step performs laser welding. The electrical device from which the sheet-like electrode tab is drawn out from the outer peripheral portion is housed in the case in a state of being arranged in a plane so that the tip ends of the electrode tabs overlap each other, and the electrode tabs are overlapped. An electrical device module in which a mating portion is joined to a bus bar disposed between the electrical devices,
The overlap portion is applied to the upper surface side of the electrode tab and the first sealant applied to the lower surface side of the electrode tab in a state along both side edges of the upper surface of the bus bar. An electric device module hermetically sealed with a second sealant that contacts the first sealant in the vicinity of the edge.   The electric device module according to claim 6, wherein the first and second sealing agents are made of the same material and are made of a thermoplastic resin. In the case, two or more rows of electric devices composed of two or more electric devices arranged in one direction are arranged adjacent to each other,
The electric bus module according to claim 6 or 7, wherein the bus bar electrically connects the electrode tab of one of the electric device groups and the electrode tab of the other electric device group.   The electric device module according to any one of claims 6 to 8, wherein a flow passage capable of supplying a refrigerant is formed in the bus bar.

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