WO2017163359A1

WO2017163359A1 - Secondary battery device

Info

Publication number: WO2017163359A1
Application number: PCT/JP2016/059347
Authority: WO
Inventors: 麻友鈴木; 敏徳内田; 黒田　和人; 辰己松尾; 関野　正宏; 小杉　伸一郎
Original assignee: 株式会社東芝
Priority date: 2016-03-24
Filing date: 2016-03-24
Publication date: 2017-09-28

Abstract

The objective of the invention is to provide a secondary battery device having a stabilizing structure that may resist the vibrations accompanying the movement of a moving vehicle while suppressing an increase in the size of the secondary battery device. The secondary battery device according to the present embodiment comprises: a casing; a battery cell housed inside the casing; and stabilizing member connection parts, each on an outer peripheral surface of the casing. The stabilizing member connection parts are provided on one side surface on the outer peripheral surface of the casing and one side surface opposite therefrom. Each of the side surfaces of the casing having the stabilizing member connection part is adhered to the battery cell through an adhesive.

Description

Secondary battery device

Embodiments of the present invention relate to a secondary battery device.

Secondary batteries used in mobile vehicles such as hybrid vehicles, electric vehicles, and railway vehicles are required to have high output and large capacity. Generally, since the output of one battery cell is limited, a secondary battery device that accommodates a plurality of battery cells is used to satisfy the requirements of high output and large capacity.

When such a secondary battery device is mounted on a moving vehicle, since a fixed strength that can withstand vibrations associated with movement of the moving vehicle is required, a screw or the like is directly driven into a housing that accommodates a plurality of battery cells, A method of fixing to a moving vehicle is taken.

JP 2007-134138 A

However, in the above-described method, a load due to vibration of the moving vehicle is applied to the portion where the screw of the casing is driven, and the secondary battery device may be damaged. On the other hand, when the strength of the screw driving portion is increased in order to prevent such damage, the driving portion of the housing is increased in size and the secondary battery device is increased in size. Therefore, the problem to be solved by the present invention is to provide a secondary battery device having a fixed structure that can withstand vibrations accompanying movement of a moving vehicle while suppressing an increase in size of the secondary battery device.

In order to solve the above-described problem, a secondary battery device of the present embodiment includes a housing, a battery cell accommodated in the housing, and a fixing member connecting portion on an outer peripheral surface of the housing, The fixing member connecting portion is provided on one side surface of the outer peripheral surface of the housing and one side surface facing the fixing member connecting portion, and the side surface of the housing having the fixing member connecting portion is fixed to the battery cell with an adhesive.

The perspective view which shows the secondary battery apparatus which concerns on 1st Embodiment. The disassembled perspective view of the secondary battery apparatus which concerns on 1st Embodiment. The perspective view of the battery cell which concerns on 1st Embodiment. The perspective view of the fixing member which concerns on 1st Embodiment. Sectional drawing of the longitudinal direction of the secondary battery apparatus which shows the application position of the adhesive agent which concerns on 1st Embodiment. Sectional drawing of the longitudinal direction of the secondary battery apparatus which shows the application position of the adhesive agent which concerns on 1st Embodiment. (A) is sectional drawing of the longitudinal direction of the secondary battery apparatus which shows the application | coating position of the adhesive which concerns on 1st Embodiment. (B) is a perspective view of the battery cell showing the application position of the adhesive according to the first embodiment. The enlarged view of the cross section of the longitudinal direction of the secondary battery apparatus which shows the application position of the adhesive agent concerning 2nd Embodiment. The perspective view of the fixing member which concerns on 3rd Embodiment. The perspective view which shows the secondary battery apparatus which concerns on 3rd Embodiment. The perspective view of the fixing member which concerns on 3rd Embodiment. The perspective view which shows the secondary battery apparatus which concerns on 3rd Embodiment. The top view of the some secondary battery apparatus which concerns on embodiment of this invention. The top view of the some secondary battery apparatus which concerns on embodiment of this invention. The side view of the secondary battery apparatus which concerns on embodiment of this invention. The figure which shows an example of the temperature characteristic of the shear elastic modulus of the adhesive agent which concerns on embodiment of this invention, and an example of the temperature characteristic of a logarithmic damping factor. The figure which shows an example of the differential scanning calorimetry thermogram of the adhesive agent which concerns on embodiment of this invention.

Hereinafter, the secondary battery device of the embodiment will be described with reference to the drawings.

(First embodiment)
1 and 2 are perspective views showing the appearance of the secondary battery device 1 according to the embodiment. FIG. 1 shows the assembled secondary battery device, and FIG. 2 shows the secondary battery device 1 disassembled. It is a disassembled perspective view which shows the state which carried out. In FIG. 2, the fixing member 60 is omitted.

As shown in FIG. 1, the secondary battery device 1 mainly includes a housing 10 that houses a plurality of battery cells 12 and a fixing member 60 that fixes the housing 10. The casing 10 has a rectangular box-shaped lower case 16 having an open top surface and a bottom wall 30, an upper case 18 that covers the upper surface opening of the lower case 16, and a cover 20 that covers the upper case. It consists of. Each component of the housing 10 is made of an insulating synthetic resin material (for example, modified PPE (polyphenylene ether), PFA (perfluoroalkoxyalkane, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), etc. ). Moreover, as a synthetic resin material of the housing | casing 10, a thermoplastic resin can be used, for example, olefin resin, such as PE, PP, and PMP, polyester-type resin, such as PET, PBT, and PEN, POM resin, PA6 Polyamide resins such as PA66, PA12, crystalline resins such as PPS resin, LCP resin and their alloy resins, or PS, PC, PC / ABS, ABS, AS, modified PPE, PES, PEI, PSF, etc. Non-crystalline resins and their alloy resins can be used.

A plurality of wall portions 37 are provided on the inner surface of the lower case 16 so that the battery cells 12 can be divided and accommodated, and for example, 24 battery accommodating portions (engagement grooves 38) are defined. The engagement groove 38 is formed in a cross-sectional shape slightly larger than the cross-sectional shape of the battery cell 12, and extends along the longitudinal direction of the lower case 16. The plurality of engaging grooves 38 are provided in three rows with a predetermined interval in the longitudinal direction of the lower case 16 and in eight rows with a predetermined interval in the short direction of the lower case 16. The electrodes of the battery cell 12 are electrically connected by a bus bar 19. Further, these bus bars 19 are electrically connected to an external connection terminal 17 provided on the outer peripheral surface of the housing 10, and the external connection terminal 17 is electrically connected to a load such as another secondary battery device or a motor. Connected. An insulating plate 90 is inserted in the gap between the plurality of battery cells 12 to prevent short-circuiting between the battery cells 12.

Here, an example of the battery cell 12 accommodated in the secondary battery device 1 will be described. The battery cell 12 is a non-aqueous electrolyte secondary battery such as a lithium ion battery. As illustrated in FIG. 3, the battery cell 12 includes a flat or substantially rectangular outer container 21 formed of aluminum or an aluminum alloy, and an outer container. And an electrode body 23 housed together with a non-aqueous electrolyte. The outer container 21 includes a container body 21a having an upper end opened, and a rectangular plate-shaped lid body 21b that closes the opening of the container body welded to the container body, and the inside thereof is formed fluid-tight. For example, the electrode body is formed in a flat rectangular shape by winding a positive electrode plate and a negative electrode plate in a spiral shape with a separator interposed therebetween, and further compressing the electrode plate in the radial direction.

The lid 21 b of the outer container 21 includes a positive terminal 22 a and a negative terminal 22 b, and the positive terminal 22 a and the negative terminal 22 b are electrically connected to the electrode body 23. In addition, a gas discharge valve that discharges the gas generated in the battery cell 12 may be provided. The battery cell 12 is not limited to the can cell in which the electrode body is accommodated in the metal can as described above, and a so-called laminate cell may be used.

Subsequently, a structure for fixing the casing 10 to the outside, for example, a moving body, which is a main characteristic part of this embodiment, will be described.

As shown in FIG. 1, the casing 10 is provided on the outer peripheral surface of the casing 10 in order to fix the fixing member 60 to the casing 10 and the fixing member 60 that connects the casing 10 and the outside, for example, a moving body. The fixing member connecting portion 40 embedded in the outer peripheral surface of the housing 10 and the fastening member 50 that fixes the fixing member 60 to the fixing member connecting portion 40 are fixed to the outside, for example, a moving body.

The fixing member connecting portion 40 has a structure in which the fixing member 60 is fastened by a fastening member 50 such as a bolt, for example, a screw portion. Specifically, for example, a non-penetrating insert nut or the like such as a cap nut in which a screw hole at one end does not penetrate. The fixing member connecting portion 40 may be provided on any outer peripheral surface of the housing 10. For example, as illustrated in FIG. 1, the fixing member connecting portion 40 is provided on one side surface and one side surface facing the side surface.

The structure of the fixing member 60 is shown in FIG. The fixing member 60 is made of, for example, metal, and includes a plurality of through holes 28 through which the fastening members 50 are inserted. The fixing member 60 has a surface that can be connected to the fixing member connecting portion 40 and a surface that can be connected to the outside, for example, a moving body, and has, for example, a substantially L-shaped cross-sectional shape. Further, the fastening member 50 and the screw portion of the fixing member connecting portion 40 are screwed together to be fastened to the fixing member connecting portion 40. Further, the fixing member 60 may be provided with a plurality of through holes 29 on the surface connected to the outside, for example, a moving body, and when the fixing member 60 has a screw portion similar to the fixing member connecting portion 40 on the outside, The fixing member 60 is fixed to the outside by the fastening member 50 being inserted through the plurality of through holes 29 and being fastened to a screw portion included in the outside.

FIG. 5 is a cross-sectional view taken along line AA ′ shown in FIG. The internal structure of the housing 10 provided with the fixing member connecting portion 40 will be described with reference to FIG. As shown here, the adhesive 100 is applied to the gap between the side surface of the housing 10 provided with the fixing member connecting portion 40 and the battery cell 12. In addition, an adhesive is applied to the gap between the battery cell 12 and the bottom wall 30 of the lower case, the gap between the battery cell 12 and the wall portion 37 provided in the lower case 16, and the portion where the plurality of battery cells 12 are in contact with each other. Yes.

FIG. 6 is a cross-sectional view taken along line AA ′ shown in FIG. As illustrated in FIG. 6, the adhesive 100 may not be applied to a portion where the plurality of battery cells 12 are in contact with each other, and the adhesive 100 may be applied to a gap between the wall portion 37 and the battery cell.

7A is a cross-sectional view taken along the line AA ′ shown in FIG. 1, and FIG. 7B is a perspective view of the battery cell 12. As shown in FIGS. 7A and 7B, the adhesive 100 may be applied between the positive terminal 22a and the negative terminal 22b in the side periphery of the lid 21b of the battery cell 12. . Also, different types of adhesive may be used for the adhesive applied to the lid 21b of the battery cell 12 and the adhesive applied to other portions.

The application positions of these adhesives 100 are merely examples, and may be applied to other positions.

(Second Embodiment)
In the second embodiment, the structure of the fixing member connecting portion 40 and the insulating plate are different from those of the first embodiment. Accordingly, the same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

FIG. 8 is a part of an enlarged view of the AA ′ line cross-sectional view shown in FIG. The second embodiment will be described with reference to FIG.

In the second embodiment, the fixing member connecting portion 40 has a through nut instead of a non-through nut such as a cap nut. Further, in addition to providing the insulating plate 90 between the battery cells 12, as shown in the cross-sectional view of FIG. An insulating plate 90 is also provided therebetween.

According to 2nd Embodiment mentioned above, even if it is a case where the fastening member 50 penetrates the housing | casing 10, it can suppress that the fastening member 50 reaches the battery cell 12 with the insulating plate 90, and the battery cell 12 Short circuit can be prevented.

(Third embodiment)
In 3rd Embodiment, there exists a part from which the structure of a fixing member differs from 1st, 2nd embodiment. Accordingly, the same portions as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

The fixing member 61 shown in FIGS. 9 and 10 is made of, for example, metal, like the fixing member 60, and is provided with a plurality of through holes 28 through which the fastening members 50 are inserted. The fixing member 61 has a surface that can be connected to the fixing member connecting portion 40 and a surface that can be connected to the outside, for example, a moving body, and has, for example, a substantially L-shaped cross-sectional shape. Further, the fastening member 50 and the screw portion of the fixing member connecting portion 40 are screwed together to be fastened to the fixing member connecting portion 40. Further, the fixing member 61 may be provided with a plurality of through holes 29 on the surface connected to the outside, for example, a moving body, and when the fixing member 61 has a screw portion similar to the fixing member connecting portion 40 on the outside, The fastening member 50 is fixed to the outside by the fastening member 50 being inserted through the plurality of through holes 29 and fastened to the screw portion of the outside.

The fixing member 61 includes at least one fixing member connecting portion 40 provided in one housing 10 and at least one fixing member connecting portion 40 provided in another housing 10 adjacent to the one housing. Are provided with a through hole 28 and a through hole 29.

According to the fixing member 61 of the third embodiment described above, in addition to fixing the casing 10 to the outside, for example, a moving body, two adjacent casings 10 can be connected and fixed by the fixing member. Therefore, it is not necessary to use a member for connecting two adjacent housings 10 apart from a member for fixing the housing 10.

(Fourth embodiment)
In the fourth embodiment, the structure of the fixing member is different from the first to third embodiments. Accordingly, the same portions as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

11 and 12 are made of, for example, metal, like the fixing

members

60 and 61, and are provided with a plurality of through holes 28 through which the fastening members 50 are inserted. The fixing member 62 has a surface that can be connected to the fixing member connecting portion 40 and a surface that can be connected to the outside, for example, a moving body, and has, for example, a substantially L-shaped cross-sectional shape. Further, the fastening member 50 and the screw portion of the fixing member connecting portion 40 are screwed together to be fastened to the fixing member connecting portion 40. Further, the fixing member 60 may be provided with a plurality of through holes 29 on the surface connected to the outside, for example, a moving body, and when the fixing member 60 has a screw portion similar to the fixing member connecting portion 40 on the outside, The fastening member 50 is fixed to the outside by the fastening member 50 being inserted through the plurality of through holes 29 and fastened to the screw portion of the outside.

According to the fixing member 62 of the fourth embodiment described above, the through hole 28 and the through hole 29 are provided so as to be connected to the fixing member connecting portions 40 provided in two or more housings 10. Moreover, the fixing member 62 shown in FIGS. 11 and 12 is the length of the side surface of the housing 10 provided with the fixing member connecting portions so that the fixing member connecting portions 40 of the two or more housings 10 can be connected. It has a length exceeding.

Further, by using the fixing member 62, in addition to being able to fix the two or more casings 10 to the outside, for example, a moving body, the two or more casings 10 can be connected, so the number of members is greatly reduced. I can do it. In addition, as shown in FIG. 12, the bottom wall 30 of the housing 10 is not used as the bottom surface, but for example, it is suitable to install the surface having the external connection terminals 17 on the outer peripheral surface of the housing 10 as the bottom surface.

According to the first to fourth embodiments described above, the housing 10 is fixed to the outside, for example, a moving body via a fixing member.

With the above structure, as shown in FIG. 1, the housing 10 can be fixed to the outside, for example, a moving body via a fixing member or the like. In addition, the cross-section of the fixing member is not limited to the L-shape, and it is possible to avoid interference with other devices by appropriately modifying the cross-section. Further, if the external body, for example, the moving body is provided with a screw portion similar to the fixed member connecting portion 40, a fastening member that is screwed into the screw portion is inserted through the through hole 29, and the external body, for example, the mobile body. , The fixing member can be fastened to the outside, for example, a moving body. In addition, the fixing member connecting portion 40 connected to the fixing member is provided on any one side surface of the housing 10 and one side surface facing the side surface, so that the housing 10 can be fixed to the outside, for example, a moving body. It becomes. Since the fixing member connecting portion 40 and the fixing member can be installed on either side as long as they face each other, the fixing position of the secondary battery device can be appropriately changed according to the installation location, and the limited space Even so, it is possible to install a secondary battery device.

In the structure of the present invention, the force applied to the fixing member connecting portion 40 is transmitted to the fixing member connecting portion-housing-adhesive-battery cell, and the force applied to the connecting portion between the fixing member connecting portion 40 and the housing 10 is dispersed. Therefore, the strength of the housing 10 can be maintained. Therefore, the required strength can be ensured even if the thickness of the outer peripheral surface forming the casing 10 is reduced, and the required strength can be ensured even if the fixing member connecting portion 40 is downsized. Therefore, the secondary battery device can be miniaturized while having a structure that can withstand vibrations of the outside, for example, a moving body.

Further, as shown in FIG. 7, by applying the adhesive 100 to the lid 21 b of the battery cell 12, the battery cell 12 and the upper case 18 are integrated, and the connection between the fixing member connecting portion 40 and the housing 10 is performed. The force applied to the part can be dispersed, which is preferable.

By applying the adhesive 100 to at least these positions, it is possible to disperse the force applied to the connection portion between the fixing member connecting portion 40 and the housing 10, but even if the adhesive 100 is applied to other positions. Good.

As shown in FIG. 13, when arranging a plurality of secondary battery devices 1, the distance from the longitudinal center of the fixing member 40 to the through hole 28 is substantially the same, and the distance from the lower part to the through hole 28 is the same. When they are substantially the same, the fastening members 50 may interfere with each other. In this case, the distance between the casings 10 of the secondary battery device 1 is d1. On the other hand, as shown in FIG. 14, when the distance from the longitudinal center of the fixing member 40 to the through hole 28 is different, or when the distance from the outside, for example, a moving body, to the through hole 28 is different, The fastening members 50 to be inserted do not interfere with each other, the distance d2 between the casings 10 is d2 <d1, and the plurality of secondary battery devices 1 can be arranged with higher density. For example, in the fixing member 60 of FIG. 4, the through-holes 28 are formed at positions that are not symmetrical with respect to the symmetry axis 25 that is perpendicular to the connection surface with the outside of the fixing member 60 on the surface connected to the housing 10. ing.

Further, as shown in FIG. 15, a heat conducting member 55 is provided at a lower portion of a surface (here, the bottom wall 30 of the lower case) where the housing 10 and the outside, for example, a moving body are in contact, and the housing 10 is fixed to the fixing member. By fixing to the outside, for example, a moving body via the fastening member 50, the bottom wall 30 can be in contact with the heat conducting member without any gap. Thereby, the uneven cooling of the battery cell 12 can be reduced.

When fixing to the outside, for example, a moving body, using a fixing band, etc., labor was required for the fixing work. However, as in the present invention, a screw portion, for example, an insert nut is used as the fixing structure, Since the housing 10 can be fixed to the outside, for example, a moving body, simply by connecting a fixing member to the battery 10, the assembly workability of the secondary battery device is improved.

As shown in FIG. 16, the adhesive 100 does not have a glass transition point at −40 ° C. to 80 ° C., and uses an adhesive having a tensile shear strength of 1 N / mm ² or more. Fix the body. That is, no peak exists at Temp-Tδ. Alternatively, as shown in FIG. 17, in the DSC (Differential Scanning Calorimetry) chromatogram, there is no DDSC peak that is a differential value of DSC.

Adhesives that are cured using organic polymers having hydrolyzable silicon-containing groups as adhesives (typically hydrolyzable silyl groups), acrylic resin adhesives, urethane resin adhesives are weather resistant. Excellent and suitable.

Among them, an adhesive that cures using an organic polymer having a hydrolyzable silicon-containing group is more preferable because it maintains a stable rubber elasticity in the normal operating temperature range and is excellent in absorbability of vibration and impact applied from the outside. .

In addition, the adhesive that cures using an organic polymer having a hydrolyzable silicon-containing group can absorb strain due to the difference in linear expansion coefficient and strain due to the thermal cycle due to its stable rubber elasticity in bonding between battery cells and exterior materials. Therefore, it is possible to provide a secondary battery device that is excellent in environmental change durability such as vibration, impact, and thermal cycle.

Furthermore, an adhesive prepared by mixing an adhesive that cures using an organic polymer having a hydrolyzable silicon-containing group and an epoxy-based adhesive can increase the adhesive strength while maintaining rubber elasticity and weather resistance, and is more suitable. It is.

In addition, considering the adhesion between the battery or the metal casing and the adhesive, it is preferable because the adhesive strength of the adhesive containing the silane coupling agent increases.

Other than that, an adhesive containing an organic metal compound such as a carboxylic acid metal salt, an organic tin compound, an organic aluminum, or an organic zirconium compound in the adhesive before curing is preferable because the adhesive strength is increased.

(Modification)
Each component of the housing 10 is described as being formed of a synthetic resin having insulation properties, for example, polyphenylene ether (PPE) or polycarbonate (PC), but a metal may be used instead. Further, a metal having a corrosion-resistant coating or an insulating coating may be used.

In the secondary battery device, the number of battery cells is not limited to 24 and can be appropriately increased or decreased as necessary. The material of the exterior body, the material of the laminate film, the material of the refrigerant, the material of each groove member, the size, and the like can be appropriately selected without being limited to the above-described embodiment. Moreover, although it described that the insulating board was pinched | interposed between each battery cell 12, the insulating film was wound around the container main body of each battery cell except the upper end part and lower end part of the container. It may be.

Further, in the present embodiment, a part of the battery cell 12 is inserted into the engagement groove 38, but it is not always necessary to insert it, and the engagement groove 38 itself may not be provided. Further, the number of engaging grooves 38 and the number of battery cells 12 to be installed are not necessarily the same, and there may be 10 battery cells for 24 engaging grooves.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Secondary battery device 10 ... Case 12 ... Battery cell 40 ... Fixing member connection part 50 ... Fastening member 60-62 ... Fixing member 90 ... Insulating plate 100- ··adhesive

Claims

The body,
Battery cells housed in the housing;
A fixing member connecting portion on the outer peripheral surface of the housing;
With
The fixing member connecting portion is provided on one side surface of the outer peripheral surface of the housing and one side surface facing the same.
A secondary battery device, wherein a side surface of the casing having the fixing member connecting portion is fixed to the battery cell with an adhesive.
The housing includes a wall portion that forms an engaging groove that houses the battery cell,
The secondary battery device according to claim 1, wherein the wall portion is fixed to the battery cell with the adhesive.
3. The secondary battery device according to claim 1, wherein an insulating plate is provided in a gap between a side surface of the housing having the fixing member connecting portion and the battery cell.
A fixing member that connects the housing and the outside;
A fastening member that is screwed into the fixing member connecting portion and fastens the fixing member to the housing;
With
The secondary battery device according to claim 1, wherein the fixing member is formed with a through hole through which the fastening member can be inserted.
In the surface of the fixing member connected to the housing, the through hole is formed at a position that is not symmetrical with respect to a symmetry axis perpendicular to the connection surface of the fixing member to the outside. The secondary battery device according to claim 4.
The glass transition point of the adhesive is −40 ° C. or lower or 80 ° C. or higher,
The softening point of the adhesive is −40 ° C. or lower or 80 ° C. or higher;
The secondary battery device according to any one of claims 1 to 5, wherein the adhesive has a tensile shear strength of 1 N / mm 2 or more.