WO2018155506A1

WO2018155506A1 - Battery module

Info

Publication number: WO2018155506A1
Application number: PCT/JP2018/006286
Authority: WO
Inventors: 貴支鈴木
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2017-02-24
Filing date: 2018-02-21
Publication date: 2018-08-30
Also published as: JP2021073649A; JP7208273B2; JPWO2018155506A1

Abstract

Provided is a battery module which absorbs cumulative dimensional errors of a battery cell and has dimensions falling within predetermined dimensions while having a compressive force of the battery module fall within a certain range with a simple configuration. The battery module (3) of the present invention is provided with: a plurality of battery cells (1) laminated and compressed in one direction; and a spacer (2) facing the side surfaces of the battery cells, sandwiched between the plurality of battery cells, and having a plurality of pressure adjustment portions (24) which are discretely disposed and structurally deformed to be pressed against the side surfaces of the battery cells, the pressure adjustment portions (24) being integrally formed.

Description

Battery module

The present invention relates to a battery module in which a plurality of secondary battery cells are stacked.

Lithium-ion batteries can charge and discharge more energy than lead batteries and nickel-cadmium batteries, so there are various types such as portable electronic devices such as mobile phones and laptop computers, auxiliary power supplies for disasters, and power supplies for mobile vehicles such as automobiles and motorcycles. It can be applied to various uses.
In a battery module for automobiles, a plurality of lithium ion battery cells (hereinafter referred to as battery cells) are connected in series, in parallel, or a combination thereof to form an assembled battery (battery module), which is a vehicle. In many cases.

In the battery module for automobiles, the electrode expansion of the battery cell due to charging / discharging is compressed and suppressed, the output is prevented from being lowered, and the battery module is compressed and stored in a predetermined size for mounting in the vehicle. .

For example, in Patent Document 1, in a spacer component arranged between battery cells, an elastic material is formed in a portion that contacts the battery cell to absorb the influence of the battery cell electrode expansion and compressive force. Is disclosed within a certain range.
In addition, the battery module of Patent Document 2 has a compressive force within a certain range by bending a connecting member that fixes the interval between the end plates according to the dimensions of the laminated body including the battery cells and the spacer parts. Yes.

JP-A-2016-186888 JP 2010-092610 A

However, in the technique of Patent Document 1 described above, the spacer component needs to form an elastic material in a portion in contact with the battery cell, and there is a problem that the component manufacturing cost is increased due to the complexity of the shape and material.
Moreover, in the technique of said patent document 2, there exists a problem that an apparatus and equipment are required in addition to the working time of the dimension measurement for matching to a dimension, and the bending process of a connection member.

The present invention has been made in view of the above points, and its object is to absorb the accumulation of dimensional errors of battery cells while keeping the compression force of the battery module within a certain range with a simple configuration. It is to provide a battery module that fits in a predetermined dimension.

In order to solve the above problems, a battery module of the present invention includes a plurality of battery cells that are stacked and compressed in one direction, and are sandwiched between the plurality of battery cells so as to face the side surfaces of the battery cells, and are discretely arranged. And a spacer formed by integrally molding a plurality of pressure adjusting portions that are structurally deformed and press-contacted to the side surface of the battery cell.

According to the present invention, it is possible to absorb the accumulation of the dimensional error of the battery cell and keep it within a predetermined size while keeping the compressive force of the battery module within a certain range with a simple configuration. Battery output performance can be maintained.

It is an external appearance perspective view of the battery cell of 1st Embodiment. It is an external appearance perspective view of the spacer of 1st Embodiment. It is a disassembled perspective view of the battery module of 1st Embodiment. It is sectional drawing of the lamination direction of a battery module. It is a figure which shows the relationship between the compression force of a battery module, and compression length. It is a figure which shows the crescent-shaped cross section of a press adjustment part. It is a figure which shows the S-shaped cross section of a press adjustment part. It is a figure which shows the cross section of the mountain shape of a press adjustment part. It is a figure which shows the cross-section of the character shape of a press adjustment part. It is a figure which shows the flap-shaped cross section of a press adjustment part. It is an external appearance perspective view of the spacer of 2nd Embodiment. It is a disassembled perspective view of the battery module of 2nd Embodiment.

Hereinafter, an embodiment of a battery module of the present invention will be described with reference to the drawings.
In the following description, the case of an in-vehicle battery module used as a power source for an electric vehicle, a hybrid electric vehicle, and a railway vehicle will be described. However, the present invention is not limited to this, and electric power generated by solar power generation or wind power generation is used. In addition to power storage systems that store power and battery modules for emergency power supplies such as elevators and medical devices, the present invention can be applied to all battery modules for home use, office use, industrial use, and the like.

<< First Embodiment >>
FIG. 1 is an external perspective view of a battery cell 1 constituting the battery module of the present embodiment.
The battery cell 1 is a prismatic lithium ion secondary battery, and an electrode group having a positive electrode and a negative electrode is accommodated in a container made of an aluminum alloy together with a non-aqueous electrolyte.
The battery cell 1 includes a flat box type battery can 11 and a battery lid 12 that seals an opening of the battery can 11.

The battery can 11 is a flat rectangular container formed by deep drawing.
The battery can 11 has a rectangular bottom surface PB, a pair of wide side surfaces PW rising from the long side of the bottom surface PB, and a pair of narrow side surfaces PN rising from the short side of the bottom surface PB.
The battery lid 12 is formed of a rectangular flat plate member and has an upper surface PU.

In the battery lid 12, a positive electrode external terminal 13 and a negative electrode external terminal 14 are arranged in the long side direction of the battery lid 12. The positive electrode external terminals 13 and the negative electrode external terminals 14 of the plurality of battery cells 1 are connected by a bus bar (not shown) to serve as input / output terminals of the battery module.

At an intermediate position in the long side direction of the battery lid 12, a gas discharge valve 15 that is cleaved by an increase in internal pressure and discharges the gas in the battery can 11 is provided.
The battery lid 12 is laser-welded to the battery can 11 to seal the opening of the battery can 11.

FIG. 2 is an external perspective view of the spacer 2.
In the battery module 3 (see FIG. 3 described later), the spacer 2 is interposed between the plurality of battery cells 1 to hold the battery cells 1 and to electrically insulate the battery cells 1 from each other. Although details will be described later, the compression force (also referred to as lashing force) and the mounting interval of the battery cell 1 are adjusted.
The spacer 2 is, for example, a part integrally formed of PBT (Poly Butylene Terephtalate) or PC (polycarbonate) resin.

The spacer 2 has a bottom wall portion 23 that faces the bottom surface PB of the battery can 11, an upper wall portion 25 that faces the top surface PU of the battery can 11, and a side wall portion 22 that faces the narrow side surface PN of the battery can 11. The battery can 11 is inserted into a space surrounded by the bottom wall 23, the upper wall 25, and the side wall 22.
Thereby, the movement of the wide side surface PW of the battery can 11 is restrained and held.

The spacer 2 is disposed over the entire wide side surface PW of the battery can 11 so as to connect the opposing side wall portions 22, and the spacer 2 is sandwiched between the wide side surfaces PW of the two battery cans 11 and a plurality of the narrow wall portions 21. And a press adjusting unit 24.
The plurality of pressure adjusting units 24 are discretely arranged in the height direction of the battery cans 11 and are in pressure contact with the wide side surfaces PW of the two battery cans 11.

FIG. 3 is an exploded perspective view showing a state in which a part of the battery module 3 of the embodiment is disassembled.
The battery module 3 is formed by alternately connecting a plurality of battery cells 1 (1a, 1b...) And spacers 2 (2a, 2b, 2c...). End spacers 7 and end plates 4 are arranged at both ends of the stacked battery cells (1a, 1b...) And spacers (2a, 2b, 2c...).
The end spacer 7 has a bottom wall portion, an upper wall portion, and a side wall portion similar to those of the spacer 2, and one surface surrounded by the bottom wall portion, the upper wall portion, and the side portion of the side wall portion is sealed.

A mounting hole 41 for attaching the battery module 3 to the vehicle is provided on the upper surface of the end plate 4.
A fixing screw hole 42 for fixing the side plate 5 with the bolt 6 is provided on the side surface of the end plate 4.

Opposing end spacers 7 are arranged between the opposing end plates 4, and a plurality of battery cells 1 (1 a, 1 b...) And spacers 2 (2 a, 2 b, 2 c...) Are interposed between the end spacers 7. They are alternately stacked.
For vehicle mounting, compressive force is applied from the end plates 4 at both ends in the stacking direction so that the distance between the mounting holes 41 of the opposing end plates 4 becomes a predetermined size, and the end plates 4 and the side plates 5 are connected by bolts 6. And the battery module 3 is assembled.

At this time, the battery module 3 of the embodiment performs the absorption of the dimensional variation of the battery cell 1 and the adjustment of the compressive force (also referred to as lashing force) by the spacer 2.
This compressive force is a holding force of the battery cell 1 of the battery module 3 and is a binding force that suppresses electrode expansion of the battery cell 1. Therefore, a predetermined range of compressive force is maintained in order to maintain the proof strength against the running vibration of the vehicle and the battery characteristics.
Next, details of the spacer 2 will be described.

FIG. 4 is a cross-sectional view of the battery module 3 in the stacking direction.
The spacer 2 is disposed between the wide side surfaces PW of the two battery cells 1.
Although the spacer 2a between the battery cell 1a and the battery cell 1b will be described here, the same applies to the other spacers 2.

The four pressure adjusting portions 24 of the spacer 2a are in pressure contact with the wide side surfaces PW of the battery cell 1a and the battery cell 1b, and the compressive force is adjusted by the structural deformation force. Details of the structure of the pressing adjustment unit 24 will be described later.
The narrow wall portion 21 of the spacer 2a is a strength maintaining member that prevents insulation between the battery cell 1a and the battery cell 1b and prevents structural deformation of the bottom wall portion 23, the upper wall portion 25, and the side wall portion 22 of the spacer 2a. Do not press the wide side surface PW of the cell 1a and the battery cell 1b.

FIG. 5 shows the compressive force (vertical axis) of the battery module 3 when the spacer member is provided with an elastic member between the battery cells 1 as in Patent Document 1 and when the pressing adjustment unit 24 of this embodiment is provided. ) And the compression length (horizontal axis).
In the case of the pressing adjustment unit 24, the change in compression force (straight line) with respect to the change in compression length is smaller than that in the case of an elastic member.

Thereby, although the compression length at the time of carrying out the lamination | stacking compression of the battery module 3 becomes large, the displacement width | variety of the compression length which generate | occur | produces the compression force of a predetermined range can be made wider than the case where an elastic member is provided. . That is, the dimensional error range of the battery cell 1 when obtaining a predetermined range of compressive force can be widened.
Moreover, even if the electrode expansion of the battery cell 1 occurs and the battery cell 1 swells, the change in compressive force can be reduced.

As shown in FIGS. 3 and 4, since the battery module 3 is provided with the plurality of spacers 2 distributed between the batteries, the dimensional error of the battery cell 1 is dispersed and absorbed. Thereby, the freedom degree of design of the spring structure of the pressure adjusting unit 24 is improved.
Hereinafter, a specific structure of the pressing adjustment unit 24 will be described.

FIG. 6A is an enlarged view of a broken line region in FIG. 4, and is a diagram showing a crescent-shaped cross section of one pressing adjustment unit 24.
As shown in FIG. 4, the spacer 2 is provided with four pressing adjustment portions 24. These are the press adjustment parts 24 which have the cross section shown to FIG. 6A, and are arrange | positioned so that the crescent-shaped convex part may protrude alternately.

The pressure adjusting unit 24 having a crescent-shaped cross section in FIG. 6A is sandwiched between the wide side surfaces PW of the two battery cells 1. One wide side surface PW is press-contacted at the center of the press adjusting portion 24, and the other wide side surface PW is press-contacted at the end of the press adjusting portion 24.
The pressure adjusting unit 24 is deformed from a crescent shape into a linear shape by the compressive force received at the pressure contact.

The battery cell 1 receives a reaction force when it is deformed from a crescent shape into a linear shape from the pressure adjusting portion 24 that is in pressure contact with the wide side surfaces PW on both sides, and this becomes the compressive force of the battery cell 1. This reaction force is a force due to the structural deformation that the pressing adjusting unit 24 restores from a linear shape to a crescent shape, and as described above, there is little variation due to dimensional variations of the battery cells 1.

As shown in FIG. 6A, the pressure adjustment is performed so that the points of the pressure adjusting unit 24 that are in pressure contact with the wide side surface PW of the battery cell 1 are shifted from each other on the wide side surface PW of the battery cell 1 that sandwiches the spacer 2. A section of the portion 24 is formed.
Alternatively, the pressure adjusting unit 24 forms a cross section in which a space in which the pressure adjusting unit 24 can be displaced by a compressive force is provided on the other battery cell 1 side facing the wide side surface PW of the one battery cell 1 in pressure contact. .

Further, it is shaped so as to be connected to the opposing side wall portion 22 at a position corresponding to any one of the three points of the center portion or the end portion of the crescent-shaped cross section of the press adjusting portion 24.
When the press adjusting part 24 is connected to the side wall part 22 at the crescent-shaped central part, the pressure contact at the end of the cross section of the press adjusting part 24 moves along the wide side surface PW when receiving a compressive force.
Similarly, when the pressure adjusting part 24 is connected to the side wall part 22 at one end of the crescent shape, the pressure contact at the other end part and the central part moves along the wide side surface PW when receiving the compressive force. To do.
Thereby, the deformation | transformation of the press adjustment part 24 is enabled in the surface direction of the wide side surface PW.
In addition, the press adjustment part 24 may be shape | molded so that it may connect with the side wall part 22 in the whole cross section.

FIG. 6B is an enlarged view of the broken line area of FIG. 4, and shows a cross section of one pressing adjustment unit 24.
6B is sandwiched between the wide side surfaces PW of the two battery cells 1, and the S-shaped convex portion of the pressure adjustment unit 24 is in pressure contact with the wide side surface PW.
The pressure adjusting unit 24 is deformed from an S-shape to a linear shape by the compressive force received by the pressure contact.

The battery cell 1 receives a reaction force when it is deformed from an S-shape to a linear shape from the pressure adjusting portion 24 that is in pressure contact with the wide side surfaces PW on both sides, and this becomes the compressive force of the battery cell 1. This reaction force is a force due to the structural deformation that the pressing adjusting unit 24 restores from a straight shape to an S-shape, and as described above, there is little variation due to dimensional variations of the battery cells 1.

As shown in FIG. 6B, the press adjusting unit 24 is arranged such that the points that come into pressure contact with the wide side surface PW of the battery cell 1 of the press adjusting unit 24 are shifted from each other on the wide side surface PW of the battery cell 1 that sandwiches the spacer 2. Thus, the cross section of the pressure adjusting portion 24 is formed.
Further, the pressure adjusting unit 24 is a cross-section in which a space in which the pressure adjusting unit 24 can be displaced by a compressive force is provided on the other battery cell 1 side facing the wide side surface PW of the one battery cell 1 to which the pressure adjusting unit 24 is pressed. Is forming.

The pressure adjusting part 24 is formed so as to be connected to the opposing side wall part 22 at a position corresponding to any one of the three points of the center part or the end part of the S-shaped cross section.
When the press adjusting part 24 is connected to the side wall part 22 at the S-shaped central part, the pressure contact at the end of the cross section of the press adjusting part 24 moves along the wide side surface PW when receiving a compressive force.
Similarly, when the pressing adjustment portion 24 is connected to the side wall portion 22 at one end portion of the S-shaped cross section, the other end portion and the central pressure contact point along the wide side surface PW when receiving a compressive force. Moving.
Thereby, the deformation | transformation of the press adjustment part 24 is enabled in the surface direction of the wide side surface PW.
In addition, the press adjustment part 24 may be shape | molded so that it may connect with the side wall part 22 in the whole cross section.

FIG. 6C is an enlarged view of the broken line region of FIG. 4 and is a view showing a cross section of one pressing adjustment unit 24.
6C is sandwiched between the wide side surfaces PW of the two battery cells 1, and the skirt of the mountain shape of the pressure adjusting unit 24 is sandwiched between the wide side surfaces PW of the two battery cells 1. The portion is in pressure contact with the wide side surface PW.
In the pressing adjustment unit 24, the chevron shape is deformed into an acute angle by the compressive force received by the pressure contact.

The battery cell 1 receives a reaction force that the chevron shape returns from the acute angle to the original angle from the pressure adjusting portion 24 that is pressed against the wide side surfaces PW on both sides, and this becomes the compressive force of the battery cell 1. This reaction force is a force due to the structural deformation that the pressing adjustment unit 24 restores to the mountain shape, and as described above, the variation due to the dimensional variation of the battery cell 1 is small.

As shown in FIG. 6C, the press adjusting unit 24 forms a cross section of the press adjusting unit 24 so that the pressure contacts of the press adjusting unit 24 face each other on the wide side surface PW of the battery cell 1 holding the spacer 2. To do.
Further, the skirt of the chevron-shaped cross section of the press adjusting unit 24 is formed so as to provide a space that can be displaced inside the press adjusting unit 24 by a compressive force.

The pressure adjusting part 24 is formed so as to be connected to the opposing side wall part 22 at a position corresponding to the apex of the mountain-shaped cross section.
The skirt of the chevron-shaped cross section of the pressing adjustment unit 24 is a free end, and therefore moves along the wide side surface PW when receiving a compressive force.
In addition, you may make it the press adjustment part 24 arrange | position the shape shown in figure upside down.

FIG. 6D is an enlarged view of the broken line region of FIG. 4 and is a diagram showing a cross section of one pressing adjustment unit 24.
6D, the pressure adjusting unit 24 having a cross-section of a dogleg shape (also referred to as <mark shape,> mark shape, inequality symbol shape) is sandwiched between the wide side surfaces PW of the two battery cells 1, and The start point / end point and the bending point are pressed against the wide side surface PW.
The pressure adjusting unit 24 is deformed into a shape in which the shape of the dog-leg is crushed by the compressive force received by the pressure contact.

The battery cell 1 receives a reaction force that attempts to return to the shape of the dogleg from the pressure adjusting unit 24 that is in pressure contact with the wide side surfaces PW on both sides, and this becomes the compressive force of the battery cell 1. This reaction force is a force due to the structural deformation that the pressing adjustment unit 24 restores to the shape of a dogleg, and as described above, there is little variation due to dimensional variations of the battery cells 1.

As shown in FIG. 6D, the cross section of the press adjusting unit 24 is formed so that the pressure contacts of the press adjusting unit 24 are arranged so as to be shifted from each other on the wide side surface PW of the battery cell 1 holding the spacer 2.
Moreover, the press adjustment part 24 forms the cross section which provided the space which can displace the press-contact of the U-shaped press adjustment part 24 to a compression direction with a compressive force.

Furthermore, the press adjusting part 24 is formed so as to be connected to the opposing side wall part 22 at a position corresponding to any one of the start point, the bending point, and the end point of the cross section of the dogleg shape.
When the pressure adjusting part 24 is connected to the side wall part 22 at the bending point of the dogleg shape, the pressure contact points at the starting point and the end point of the dogleg shape move along the wide side surface PW when receiving the compressive force. .
When the pressure adjusting unit 24 is connected to the side wall portion 22 at the starting point of the V shape, the bending point and the end pressure contact point of the V shape move along the wide side surface PW when receiving the compressive force. .
When the pressure adjusting portion 24 is connected to the side wall portion 22 at the end point of the dogleg shape, the bent point of the dogleg shape and the pressure contact point at the start point move along the wide side surface PW when receiving the compressive force. .
Thereby, the deformation | transformation of the press adjustment part 24 of the wide side surface PW direction is enabled.
In addition, the press adjustment part 24 may be shape | molded so that it may connect with the side wall part 22 in the whole cross section.

FIG. 6E is an enlarged view of the broken line region of FIG. 4 and shows a cross section of one pressing adjustment unit 24.
6E is pressed between the wide side surfaces PW of the two battery cells 1, and both ends of the pressure adjustment unit 24a are in pressure contact with the wide side surface PW.
The pressure adjusting unit 24a is deformed like a bow by the compressive force received at the pressure contact.

The battery cell 1 receives a reaction force when it is deformed like a bow from the pressure adjusting portion 24a pressed against the wide side surfaces PW on both sides, and this becomes the compressive force of the battery cell 1. This reaction force is a force due to the structural deformation of the pressure adjusting unit 24a, and as described above, there is little variation due to dimensional variations of the battery cells 1.

As shown in FIG. 6E, the press adjusting unit 24 a is arranged such that the points that come into pressure contact with the wide side surface PW of the battery cell 1 of the press adjusting unit 24 a are shifted from each other on the wide side surface PW of the battery cell 1 holding the spacer 2. In this way, a cross section of the pressing adjustment portion 24a is formed.
Further, the end portion of the pressing adjustment portion 24a is formed so as to provide a space that can be displaced in the compression direction by a compression force.

The press adjusting part 24a is formed so as to be connected to the opposing side wall part 22 at a position corresponding to any one of the three points of the center part or the end part of the cross section.
When the press adjusting part 24a is connected to the side wall part 22 at the center, the pressure contact at the end of the press adjusting part 24a moves along the wide side surface PW when receiving a compressive force.
When the pressure adjusting portion 24a is connected to the side wall portion 22 at one end, the pressure contact at the other end moves along the wide side surface PW when receiving a compressive force.
Thereby, the deformation | transformation of the press adjustment part 24a of the wide side surface PW inner direction is enabled.
In addition, the press adjustment part 24 may be shape | molded so that it may connect with the side wall part 22 in the whole cross section.

By the way, the wide side surface PW of the battery cell 1 is electrode-expanded like a drum. Therefore, the clearance between the stacked battery cells 1 is narrow at the center of the wide side surface PW and wider at the periphery than at the center.
In order to make the compressive force of the battery module 3 uniform surface pressure, the cross-sectional shape of the pressing adjustment unit 24 may be changed in the direction of the side wall 22.

For example, as shown in FIG. 6E, the end portion has the cross-sectional shape of the press adjusting portion 24a, and the central portion has the cross-sectional shape of the press adjusting portion 24b. That is, it is formed such that the width of the central portion of the press adjusting portion 24 is wider than the width of the end portion.
This means that in the relationship between the compression force and the compression length in FIG. 5, the central portion of the pressing adjustment portion 24 has a spring characteristic with a linear inclination smaller than that of the end portion.
Thereby, even when the battery cell 1 expands the electrode, it is possible to generate a compressive force having a uniform surface pressure.

Contrary to the above, the cross-sectional shape of the press adjusting part 24a and the end part may be the cross-sectional shape of the press adjusting part 24b.
In this case, the compressive force at the center is increased, and the drum-like electrode expansion of the battery cell 1 can be suppressed.

The configuration in which the cross section of the pressure adjusting unit 24 has a different shape in the surface direction of the wide side surface PW is not limited to the flap shape cross section of FIG. 6E but can be applied to other cross sectional shapes of FIGS. 6A to 6D.

Furthermore, you may change arrangement | positioning between the side wall parts 22 of the press adjustment part 24. FIG.
FIG. 2 and FIG. 4 show that the four pressure adjusting portions 24 are evenly arranged, but the interval between the central pressure adjusting portions 24 is larger than the interval between the end pressure adjusting portions 24. To place.
Thereby, the compressive force of the press adjusting part 24 at the center is reduced, and the surface pressure of the compressive force is made uniform.

<< Second Embodiment >>
Next, the battery module 3 of the second embodiment will be described with reference to FIGS.
FIG. 7 is an external perspective view of the spacer 2.
The spacer 2 of FIG. 7 is configured such that, in the spacer 2 of the first embodiment shown in FIG. 2, an opening 26 that communicates with the space sandwiched between the pressing adjustment portions 24 is provided on each of the opposing side wall portions 22. It has become.

A coolant such as cooling air flows from the opening 26 of the one side wall portion 22 and flows through the cooling flow path formed by the pressing adjustment portion 24 facing the wide side surface PW of the opposite battery cell 1 and the other side wall. It flows out from the opening part 26 of the part 22. FIG.
By this refrigerant flow, the battery cell 1 can be cooled on the wide side surface PW.

FIG. 8 is an external perspective view of the battery module 3.
In the battery module 3 according to the first embodiment shown in FIG. 3, the side plate 5 has an opening 51 that communicates with the opening 26 described in FIG.

Thereby, even when the battery module 3 is mounted on the vehicle, the cool air can be introduced from the opening 51 using the fan or the duct and can be discharged from the opening 51 provided in the opposite side plate 5. The temperature management of the module 3 can be performed.

As described above, in the battery module 3 in which the plurality of battery cells 1 are stacked, the spacer 2 between the battery cells 1 is provided with the pressure adjusting portion 24 that generates a repulsive force due to structural deformation. When assembling the battery module 3 with the module length, the fluctuation range of the compressive force with respect to the dimensional variation of the battery cell 1 can be narrowed.
In addition, since the pressure adjusting unit 24 is a homogeneous member that can be integrally formed with the spacer 2, the manufacturing cost of the spacer 2 can be reduced.
In addition, since the pressing adjustment unit 24 is a structural deformation member, the degree of freedom in design can be increased in relation to the dimensional variation and the variation range of the compressive force.

Further, the present invention is not limited to the above-described embodiments, and includes various modifications. The above-described embodiments have been described in detail for easy understanding in the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.

DESCRIPTION OF SYMBOLS 1 Battery cell PW Wide side surface 2 Spacer 24 Press adjustment part 26 Opening part 3 Battery module 51 Opening part

Claims

A plurality of battery cells stacked and compressed in one direction;
A spacer having a plurality of pressure adjusting portions that are sandwiched between the plurality of battery cells so as to face the side surfaces of the battery cells and are discretely arranged and structurally deformed to press-contact the side surfaces of the battery cells;
A battery module comprising:
The battery module according to claim 1,
A battery module comprising: a space in which the pressure adjusting portion is displaced between a side surface of the other battery cell facing the one battery cell in pressure contact with the pressure adjusting portion and the pressure adjusting portion.
The battery module according to claim 1,
The battery module according to claim 1, wherein the pressure adjusting unit is in pressure contact with a side surface of one opposing battery cell and a side surface of the other battery cell facing each other at different positions and in different directions.
The battery module according to claim 1,
The battery module according to claim 1, wherein the pressing adjustment portion has a protruding shape and is in pressure contact with each of the plurality of battery cells.
The battery module according to claim 1,
The battery module according to claim 1, wherein the pressing adjustment section has a crescent-shaped or a cross-section with a U-shape.
The battery module according to claim 1,
The battery module according to claim 1, wherein the pressing adjustment unit has an S-shaped or flap-shaped cross section.
The battery module according to claim 1,
The battery module according to claim 1, wherein the pressure adjusting portion has a mountain-shaped cross section.
The battery module according to claim 1,
The battery module according to claim 1, wherein the pressure adjusting portion has a cross-sectional shape at a central portion larger than a cross-sectional shape at an end portion.
The battery module according to claim 1,
The battery module, wherein an arrangement interval of a central portion in a plane facing the side surface of the battery cell of the pressing adjustment unit is wider than an arrangement interval of end portions.
The battery module according to claim 1,
An opening is provided in a side wall portion where both ends of the pressing adjustment portion of the spacer are connected,
The battery module is characterized in that the space surrounded by the side surface of the battery cell and the pressure adjusting portion is a refrigerant flow path communicating with the opening.