JP2014154512A - Battery cell and battery module having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily secure a cooling air passage between battery cells which are laminated without using other members.SOLUTION: A battery cell includes: a case 11 having a substantially rectangular parallelepiped shape; and a protruding part 31 which is provided protruding from at least one of facing surfaces 30, which face each other in a lamination direction that battery cells 10 are laminated, from among outer surfaces of the case 11 and is butted with a counterpart battery cell 10 which is laminated to the battery cell 10.

Description

  The present invention relates to a battery cell and a battery module having the battery cell.

  Secondary batteries such as lithium ion batteries and nickel metal hydride batteries have a large power storage density per battery volume and weight, so they are used as power storage devices in combination with battery power supplies for mobile objects such as electric vehicles and solar power generation. Yes. These secondary batteries require a very large power supply capacity, but the electromotive force of the smallest unit battery cell that generates power is as small as several volts, so one battery cell meets the demand for a large power supply capacity. I can't. Therefore, a plurality of battery cells are stacked and connected in series or in parallel to form a battery module, thereby increasing the capacity or increasing the output.

  In the battery module, it is necessary to manage the battery cell at an appropriate temperature in order to achieve efficient charging / discharging and to ensure a long-term life. Moreover, when the temperature variation between battery cells is large, a difference occurs in internal resistance and chemical reaction, resulting in a decrease in charge / discharge efficiency as a whole battery module and a deterioration in life.

  Therefore, in order to improve the cooling efficiency of the battery module, a structure is used in which a space serving as a cooling air passage is provided between stacked battery cells. For example, Patent Document 1 discloses a technique in which a spacer integrated with an inter-terminal conductor or an inter-terminal insulator is disposed on a side surface of the stacked battery cells in order to form a cooling air passage between the stacked battery cells. It is disclosed. The spacer forms a space serving as a cooling air passage for allowing the cooling air to pass therethrough. Cooling air can be passed between the battery cells stacked by the spacer to cool the battery cells, and the cooling efficiency of the battery module is improved.

JP 2006-196222 A

  However, in the battery cell described in Patent Document 1, it is necessary to use a spacer which is a member other than the battery cell in order to form a cooling air passage between the stacked battery cells, which increases the number of parts and costs. Has the problem of increasing.

  The present invention has been made to solve the above problems, and provides a battery cell capable of easily securing a cooling air passage between battery cells stacked without using other members. For the purpose.

In order to solve the above problems, the present invention proposes the following means.
A battery cell according to an embodiment of the present invention is provided by protruding from at least one of a substantially rectangular case and an opposing surface facing the stacking direction of the outer surfaces of the case, and the stacked counterpart battery. And a protrusion that is brought into contact with the cell.

  According to such a configuration, when the battery cells are stacked by bringing the protrusions formed on the outer surface of the case into contact with each other, a space is created between the stacked battery cells and a cooling air passage is formed. Can do. For this reason, it becomes possible to ensure a cooling air path easily between the battery cells laminated | stacked without using another member.

  Further, in the battery cell according to another aspect of the present invention, the protrusion is provided at the center of at least one of the pair of facing sides among the two pairs of facing sides forming the facing surface. It is characterized by being.

According to such a configuration, the projecting portion is provided at the center of at least one of the pair of opposing sides among the two pairs of opposing sides forming the opposing surface. As a result, the space generated between the stacked battery cells is opened except for the central portion in two directions, that is, the direction along one side of the opposing surface and the direction along the other side orthogonal to one side of the opposing surface. It becomes a state. Therefore, a cooling air passage is formed in two directions orthogonal to each other along the facing surface. By forming the cooling air passages in two directions orthogonal to each other along the opposing surface, the cooling air passage in one direction is closed even if the cooling air passage in one direction is blocked, and a cooling effect is obtained. Can do. Thereby, it becomes possible to easily obtain a cooling effect regardless of the posture and place where the battery cell is installed.
In addition, a protrusion is provided at the center of at least one of the pair of opposing sides of the two pairs of opposing sides forming the opposing surface, so that the protrusion is on one side where the outer surfaces of the case intersect. Will be provided. The rigidity of the central part of one side where the outer surfaces of the case intersect with each other can be improved. As a result, the influence of the deformation of the case is reduced, and the position of the protruding portion does not move. Therefore, the battery cells can be stably stacked without moving while the battery cells are in contact with each other.

  Furthermore, the battery cell which concerns on the other aspect of this invention is characterized by the recessed part being formed in the inner surface of the said case in the position in which the said projection part was provided.

  According to such a configuration, a recess is formed in the inner surface of the case by forming the recess in the inner surface of the case at the position where the protrusion is provided. By increasing the volume of this space, the electrolyte filled in the case can be increased. Moreover, the space which efficiently circulates the gas generated in the case and the electrolyte by charging / discharging the electrode cell is widened by the recess. Thereby, reaction of the electrode of a battery cell is performed efficiently, and the discharge efficiency of a battery cell can be improved.

  Furthermore, the battery cell which concerns on the other aspect of this invention WHEREIN: The said projection part is the said battery cell to at least one direction along the said opposing surface between the projection parts provided in the said other party battery cell. It is formed in the shape which mutually controls a movement of.

  According to such a structure, the movement to the direction along the opposing surface of a battery cell is controlled by the projection part of the battery cells laminated | stacked. Therefore, even when the case is deformed or an external force is applied, the positions of the battery cells can be prevented from moving. Thereby, a battery cell can be laminated | stacked more stably and a battery module can be formed easily.

  Moreover, the battery cell which concerns on the other aspect of this invention is characterized by the said protrusion part protrudingly provided ranging over the side surface which opposes the horizontal direction orthogonal to the said lamination direction, and the said opposing surface.

  According to such a configuration, when the battery cells are stacked not only in one stacking direction but also in a lateral direction perpendicular to the stacking direction, the cooling air passage is provided between the battery cells on the side surface in any direction. Can be formed. Thereby, a cooling air path can be provided in the side surface of the two directions to laminate | stack, and cooling efficiency can be improved, laminating | stacking many battery cells easily.

  Furthermore, the battery cell according to another aspect of the present invention is characterized in that the protrusion is provided at the center of the facing surface with the outer surface protruding only while the inner surface of the case is flat.

  According to such a configuration, by making only the outer surface protrude while making the inner surface flat, the central portion of the facing surface of the case becomes thick, and the rigidity of the case can be increased. Even if the electrode in the battery cell swells and deforms in the direction of expanding the case during discharging, the case can be suppressed by the case because the case has high rigidity. Thereby, the deformation of the electrode can be reduced by the case.

  In addition, a battery module according to an aspect of the present invention is formed by stacking a plurality of the battery cells.

  According to such a configuration, it is possible to easily form a battery module having a high heat dissipation effect.

  Furthermore, the battery module according to another aspect of the present invention is characterized in that the battery cells are stacked such that the protrusions and the protrusions provided on the mating battery cell are in contact with each other.

  According to such a structure, the space which arises between the battery cells laminated | stacked can be expanded because the protrusion part of the battery cells laminated | stacked mutually contact | abuts. Therefore, the cooling air passage is widened, and the cooling efficiency can be further improved.

  According to the battery cell of the present invention, the protrusion is provided on the outer surface of the case, and the cooling air passage can be formed by contacting the battery cell on which the protrusion is laminated, and the cooling air passage can be formed without using other members. Can be easily secured.

It is a perspective view explaining the battery module concerning a first embodiment of the present invention. It is a product perspective view explaining the lamination | stacking state of the battery cell inside the battery module which concerns on 1st embodiment of this invention. It is the perspective view by which a part of battery cell explaining the structure of the battery cell which concerns on 1st embodiment of this invention was fractured | ruptured. It is a schematic diagram explaining the battery cell which concerns on 1st embodiment of this invention, The figure (a) is a perspective view of a battery cell, The figure (b) is a cross-sectional view in AA of a battery cell. It is a schematic diagram explaining the battery cell which concerns on 2nd embodiment of this invention, The figure (a) is a perspective view of a battery cell, The figure (b) is a cross-sectional view in BB of a battery cell. It is a perspective view of the battery module using the battery cell which concerns on 3rd embodiment of this invention. The schematic diagram explaining the battery cell which concerns on 3rd embodiment of this invention, The figure (a) is a perspective view of a battery cell, The figure (b) is an enlarged view of the cross-sectional view in CC of a battery module. is there. It is a schematic diagram explaining the battery cell which concerns on 4th embodiment of this invention, The figure (a) is a perspective view of a battery cell, The figure (b) is a cross-sectional view in DD of a battery cell. It is a schematic diagram explaining the battery cell which concerns on the 1st modification of this invention, The figure (a) is a perspective view of a battery cell, The figure (b) is a cross-sectional view in EE of a battery cell. It is a schematic diagram explaining the battery cell which concerns on the 2nd modification of this invention, The figure (a) is a perspective view of a battery cell, The figure (b) is a cross-sectional view in FF of a battery cell. It is a perspective view explaining the battery cell which concerns on the 3rd modification of this invention.

Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, the battery module 1 of the first embodiment includes a plurality of stacked battery cells 10 and a battery module case 20 that houses the plurality of battery cells 10 therein.
As shown in FIG. 2, in the first embodiment, a plurality of battery cells 10 are stacked so that the battery cells 10 are arranged in one direction in the battery module 1. The battery cell 10 has a rectangular shape in a longitudinal sectional view that is a cross section orthogonal to the stacking direction in which the battery cells 10 are stacked. In the following, the stacking direction of the battery cells 10 is the Z direction, the rectangular horizontal direction of the battery cells 10 in the vertical cross-sectional view orthogonal to the stacking direction is the X direction, and the rectangular shape of the battery cells 10 in the vertical cross-sectional view orthogonal to the stacking direction. The vertical direction is called the Y direction.

The battery module case 20 is formed in a bottomed rectangular tube shape that accommodates the battery cell 10 therein, and includes a restraint plate 21 that forms a side surface along the X direction, and a plurality of restraint plates 21 that are fixed in the Z direction. It has a restraining pin 22 and a bottom plate 23 that forms the bottom.
The constraining plates 21 have a rectangular flat plate shape, and two constraining plates 21 are arranged apart from each other in the Z direction.
The constraining pins 22 are cylindrical pins that restrict relative displacement in the Z direction of the constraining plate 21 and are spaced apart from each other in the X direction and are spaced apart from each other in the Y direction. Then, three of them are arranged and the restraint plate 21 is fixed.
The bottom plates 23 are respectively fixed to the constraining plates 21 that are separated from each other, and are arranged in a rectangular flat plate shape. The battery module case 20 of the first embodiment is not limited to the above-described structure, and may be any structure as long as the stacked battery cells 10 can be fixed. Depending on factors such as the shape and size of the battery cells 10 You may change suitably.

As shown in FIG. 3, the battery cell 10 includes, for example, a lithium ion secondary battery. In the first embodiment, the outer shape is formed in a substantially rectangular shape, and a plurality of electrode plates are stacked inside. Adopted a stacked type secondary battery.
Specifically, the battery cell 10 includes a positive electrode plate 12 and a negative electrode plate 13 which are alternately stacked, a separator 14 interposed between the positive electrode plate 12 and the negative electrode plate 13, a positive electrode plate 12 and a negative electrode plate 13, respectively. And a case 11 for storing the separator 14, a pair of electrode terminals 15 projecting upward, and an electrolyte solution (not shown) filled in the case 11.

As shown in FIGS. 4A and 4B, the case 11 is made of, for example, an aluminum alloy. The case main body 110 is formed in a substantially rectangular shape, and the case main body 110 is arranged in the Z direction. A protrusion 31 is formed on the side surface so as to protrude from the facing surface 30 and comes into contact with the mating battery cell 10.
The case main body 110 has a substantially rectangular shape, and is a lid surface 110a that is an upper surface in the Y direction on which the electrode terminals 15 are provided, and a surface that faces the lid surface 110a and is located on the opposite side. It has a bottom surface 110b, and a side surface connecting the lid surface 110a and the bottom surface 110b of the case 11. The case body 110 has a hollow interior, and the hollow portion is filled with an electrolyte solution (not shown). In the present embodiment, of the side surfaces, the surface in the longitudinal direction of the lid surface 110a and the bottom surface 110b and facing the Z direction as the stacking direction is referred to as a facing surface 30.
The facing surface 30 is a first side 30a that is one side extending along the X direction of the facing surface 30 and another side that is orthogonal to the first side 30a that is one side of the facing surface 30 and extends along the Y direction. And a second side 30b. The facing surface 30 has a rectangular shape with a pair of first side portions 30a and a pair of second side portions 30b. In the first embodiment, the substantially rectangular shape is not limited to a perfect rectangular shape. For example, the case has a rounded corner, or the entire side surface of the battery cell 10 that is not the facing surface 30 is a curved surface. Represents a shape that may exist.

  The protruding portion 31 protrudes in a rectangular shape from the facing surface 30, and includes a first side portion 30 a that is a side in the X direction that forms the facing surface 30 and a second side portion 30 b that is a side in the Y direction. One of the opposing sides of the pair is provided in the center of the second side 30b that extends in the Y direction and faces each other. That is, for each one facing surface 30, the protruding portion 31 protrudes outward from the facing surface 30, and the center of the second side portion 30 b on one side (front side) in the X direction and the other side in the X direction ( It is provided at the center of the second side 30b on the back side. As shown in FIG. 4B, the protrusion 31 has a recess 311 having a shape corresponding to the protrusion 31 on the inner surface of the case main body 110 at the position where the protrusion 31 is provided. In addition, the recessed part 311 and the projection part 311 can be formed by making the board | plate material which forms the opposing surface 30 of the case main-body part 110 protrude from the inner side to the outer side, for example.

  Both of the positive electrode plate 12 and the negative electrode plate 13 are formed in a rectangular plate shape, and the electrode stacking direction of the positive electrode plate 12 and the negative electrode plate 13 is stacked in the short direction of the lid surface 110a. That is, the positive electrode plate 12 and the negative electrode plate 13 are stacked in the case 11 along the same Z direction as the stacking direction of the battery cells 10 in the battery module 1.

The separator 14 is made of an insulating material, and is formed into a sheet shape with a resin such as polypropylene, for example. The separator 14 is formed so as to cover the whole of all the positive electrode plates 12, and is interposed between the positive electrode plate 12 and the negative electrode plate 13 to insulate each other.
The separator 14 may be formed so as to cover the whole of all the negative electrode plates 13, or only the positive electrode plate 12 and the negative electrode plate 13 without covering the positive electrode plate 12 and the negative electrode plate 13. You may form so that it may arrange | position between.

  The electrode terminal 15 has a pair of columnar shapes with respect to the lid surface 110a and protrudes upward in the Y direction. One is a positive electrode terminal 15 connected from the positive electrode plate 12, and the other is a negative electrode terminal 15 connected from the negative electrode plate 13.

Next, the operation of the battery cell 10 having the above configuration will be described.
According to the battery cell 10 as described above, as shown in FIG. 2, the battery cell 10 is laminated by contacting the rectangular protrusions 31 provided on the facing surface 30 of each battery cell 10. Yes. When the battery cells 10 are stacked by contacting the protruding portions 31 projecting outward from the facing surface 30 that is the outer surface of the case 11, a space is formed between the facing surfaces 30 of the two stacked battery cells 10. Can be generated. That is, the protrusion 31 forms a space between the battery cells 10, thereby forming a cooling air passage that is a space in which the air around the battery cell 10 circulates. Thereby, it becomes possible to easily secure a cooling air passage between the battery cells 10 stacked without using other members.

  Moreover, it is laminated | stacked by each providing the projection part 31 in the center of the 2nd side part 30b which is one side among the 1st side part 30a and the 2nd side part 30b which form the opposing surface 30 which is a side surface. The space generated between the battery cells 10 is open so that air can flow in two directions along the facing surface 30 between the X direction and the Y direction. Therefore, the cooling air passage is formed in two directions orthogonal to each other along the facing surface, and the air flow direction between the stacked battery cells 10 is two directions. Therefore, even if the cooling air passage in one direction is blocked, the cooling effect can be obtained by opening the other cooling air passage that is orthogonal. Thereby, it becomes possible to easily obtain a cooling effect regardless of the posture and place where the battery cell 10 is installed.

  Furthermore, the projection part 31 is provided in the center of the second side part 30b which is one of the first side part 30a and the second side part 30b which form the opposing surface 30 which is a side surface. 31 is provided in the 2nd side part 30b which is one side where the side surfaces of the case main-body part 110 cross | intersect. When the battery cell 10 is charged and discharged, the internal positive electrode plate 12 and the negative electrode plate 13 are deformed. In accordance with this, the case main body 110 is also deformed so as to bulge outward. However, the amount of deformation is usually smaller at the end portion of the facing surface 30 than at the central portion of the facing surface 30 that is the side surface of the case 11. ing. That is, in the second side portion 30b, which is one side where the side surfaces of the case main body portion 110 intersect, the amount of deformation when the case main body portion 110 swells and deforms is small. Furthermore, the provision of the protruding portion 31 can improve the rigidity of the central portion of the second side portion 30b. As a result, the influence of the deformation of the case main body 110 is reduced and the position of the protrusion 31 is difficult to move. Therefore, the battery cells 10 can be stably stacked without moving while the battery cells 10 are in contact with each other. Can do.

Further, by forming the recess 311 on the inner surface of the case main body 110 at the position where the protrusion 31 is provided, a space by the recess 311 is formed in the hollow portion that is the inner surface of the case main body 110. By increasing the volume of the hollow portion of the case main body 110 by this space, the electrolyte filled in the case main body 110 can be increased. Thereby, reaction of the positive electrode plate 12 and the negative electrode plate 13 is performed efficiently, and the discharge efficiency of the battery cell 10 can be improved.
Furthermore, in the case main body 110 which is the battery cell 10, gas is generated every time the positive electrode plate 12 and the negative electrode plate 13 which are electrodes react by charge and discharge. If this gas stays around the positive electrode plate 12 or the negative electrode plate 13, the reaction becomes dull and the discharge efficiency of the battery cell 10 is lowered. However, the recess 311 increases the volume of the hollow portion of the case main body 110, thereby expanding the space in which the gas and the electrolyte circulate, and makes it easier for the gas to escape from around the positive electrode plate 12 and the negative electrode plate 13. Also by this, reaction of the positive electrode plate 12 and the negative electrode plate 13 is performed efficiently, and the discharge efficiency of the battery cell 10 can be improved. In the first embodiment, the recess 311 on the inner surface of the case main body 110 may be omitted as necessary, and the inner surface may be flat.

Further, since the protrusions 31 of the battery cells 10 to be stacked are in contact with each other, the space generated between the battery cells 10 to be stacked is the protrusion 31 of one battery cell 10 and the other battery cell 10. It is possible to make the space larger than the space generated when the opposite surface 30 is in contact. As a result, the cooling air passage is expanded and the cooling efficiency can be further improved.
Furthermore, by forming the battery module 1 using such battery cells 10, it is possible to easily form the battery module 1 having a high heat dissipation effect.

Next, the battery cell 10 of 2nd embodiment is demonstrated with reference to Fig.5 (a), (b).
In the second embodiment, the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof is omitted. The battery cell 10 of this second embodiment is different from the first embodiment with respect to the shape of the protrusion 31.

That is, in 2nd embodiment, the 1st battery cell 10a and the 2nd battery cell 10b are the center of the 2nd side part 30b of one opposing surface 30 which is the same position as the projection part 31 in 1st embodiment. Have an inclined protrusion 31a. And the 1st battery cell 10a and the 2nd battery cell 10b have the reverse inclination protrusion part 31b in the center of the 2nd side part 30b of the other opposing surface 30. As shown in FIG.
And the 1st battery cell 10a and the 2nd battery cell 10b in 2nd embodiment are the inclination protrusion part 31a of the 1st battery cell 10a, and the reverse inclination protrusion part 31b of the 2nd battery cell 10b. They are stacked in contact.

The inclined protrusion 31 a is provided so as to protrude from the center of the second side 30 b of the one opposing surface 30 so that the surface along the opposing surface 30 approaches the opposing surface 30 as it goes toward the center of the opposing surface 30. Inclined.
The reverse inclined protrusion 31b is provided to project in the center of the second side 30b of the other facing surface 30 corresponding to the one facing surface 30 of the first battery cell 10a. The reversely inclined protrusion 31b is inclined so that the surface along the other opposing surface 30 moves away from the opposing surface 30 toward the center.

According to the battery cell 10 of the second embodiment as described above, the inclined protrusion 31a provided in the first battery cell 10a and the reverse inclined protrusion 31b provided in the stacked second battery cell 10b. Are stacked in contact with each other, the movement of the stacked battery cells 10 in the X direction can be restricted by the inclined protrusion 31a and the reverse inclined protrusion 31b. Therefore, even when the case main body 110 swells and deforms due to the deformation of the positive electrode plate 12 and the negative electrode plate 13 or an external force is applied, the movement between the stacked battery cells 10 and the inclined protrusion 31a. Since it is regulated by the reverse inclined protrusion 31b, the positions of the battery cells 10 can be prevented from moving. For this reason, the battery cells 10 do not move while in contact with each other, the battery cells 10 can be stacked more stably, and the battery module 1 can be easily formed.
In addition, the shape of the inclination protrusion part 31a and the reverse inclination protrusion part 31b is not restricted to the shape of this embodiment, What is necessary is just a shape which mutually controls the movement of the battery cell 10 laminated | stacked. For example, the protruding portion 31 formed on one facing surface 30 is formed in a circular hole shape, and the protruding portion 31 formed on the other facing surface 30 is formed in a corresponding cylindrical shape, or the inclined protruding portion 31a and the reverse inclined protruding portion. It may be arranged and formed so as to be alternately combined with 31b.

Next, the battery cell 10 of 3rd embodiment is demonstrated with reference to FIG. 6, FIG. 7 (a), (b).
In the third embodiment, the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof is omitted. The battery cell 10 of the third embodiment is different from the first embodiment in that the protrusion 31 is formed across two sides of the side surface of the case main body 110.

That is, in the third embodiment, as shown in FIGS. 6 and 7A, the battery cell 10 includes a facing surface 30 that faces the Z direction that is the stacking direction and a lateral surface that is orthogonal to the Z direction that is the stacking direction. It has the adjacent protrusion part 32 which protrudes ranging over the 2nd opposing surface 301 which is a side surface of the X direction which is a direction.
The adjacent protrusion 32 has an L-shaped cross-section along the second side 30b that is a line of intersection between the facing surface 30 and the second facing surface 301, and the four second sides of the case body 110. Each is formed in the center of 30b.

  According to the battery cell 10 of the third embodiment as described above, as shown in FIG. 7B, the battery module 1 is stacked by stacking the battery cells 10 also in the X direction orthogonal to the Z direction that is the stacking direction. When forming, a space can be formed between each of the stacked battery cells 10 in the X direction and the Z direction. Therefore, even if the module is configured by increasing the number of battery cells 10 to be stacked, a space can be provided on the side surfaces in the two directions in which the battery cells 10 are stacked. Thereby, while forming many battery cells 10 and forming the battery module 1, the cooling efficiency which is used can be improved by providing a cooling wind path | route in the two directions to laminate | stack.

Next, the battery cell 10 of 4th embodiment is demonstrated with reference to Fig.8 (a), (b).
In the fourth embodiment, the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof is omitted. The battery cell 10 according to the fourth embodiment is different from the first embodiment in that it does not have a position where the protrusion 31 is formed and the recess 311.

That is, in the fourth embodiment, the battery cell 10 has the filling protrusion 33 at the center of the facing surface 30.
The filling protrusion 33 is provided in a central portion of the facing surface 30 so as to project only the outer surface while being rectangular and flat on the inner surface.

  According to the battery cell 10 of the fourth embodiment as described above, the central portion of the facing surface 30 of the case body 110 is thickened by the filling protrusion 33, so that the rigidity of the facing surface 30 that is the case body 110 is increased. Can be high. Even if the positive electrode plate 12 and the negative electrode plate 13 in the battery cell 10 react to the time of discharge and swell and deform in the direction in which the case main body 110 expands, the case main body 110 has high rigidity. The deformation of the positive electrode plate 12 and the negative electrode plate 13 can be suppressed without deformation of 110. Thereby, the deformation of the positive electrode plate 12 and the negative electrode plate 13 can be reduced by the case main body 110. In particular, since the filling protrusion 33 is provided at the center where deformation is greatest, deformation of the positive electrode plate 12 and the negative electrode plate 13 can be further reduced. Further, by providing the filling protrusion 33 with the inner surface not concave and flat, the thickness of the portion where the filling protrusion 33 is provided increases, and the rigidity increases, and the positive electrode plate 12 and the negative electrode plate 13 are increased. Can be further reduced.

Next, the battery cell 10 of a 1st modification is demonstrated with reference to Fig.9 (a), (b).
In the first modification, the same reference numerals are given to the same components as those in the first embodiment, and detailed description thereof is omitted. The battery cell 10 of this first modified example is different from the first embodiment in the position where the protrusion 31 is provided.

  That is, in the first modification, the protruding portion 31 protrudes in a rectangular shape from the facing surface 30 as in the first embodiment. Unlike the first embodiment, the protruding portion 31 extends in the X direction among the first side portion 30a that is the side in the X direction that forms the facing surface 30 and the second side portion 30b that is the side in the Y direction. One each is provided in the center of the opposing first side 30a. In other words, for each one facing surface 30, the protruding portion 31 protrudes outward from the facing surface 30, and the center of the first side portion 30 a on the upper side of the paper in the Y direction and the second side portion on the lower side in the Y direction. 30b is provided at the center of each. As shown in FIG. 9B, as in the first embodiment, the protrusion 31 has a recess 311 having a shape corresponding to the protrusion 31 on the inner surface of the case body 110 at the position where the protrusion 31 is provided. Have.

  According to the battery cell 10 of the first modification as described above, the gas generated around the positive electrode plate 12 and the negative electrode plate 13 inside the case main body 110 rises upward in the Y direction. 31 is provided at the center of the first side portion 30a on the upper side in the Y direction with the concave portion 311, so that gas can be easily released to the concave portion 311 more efficiently. Thereby, reaction of the positive electrode plate 12 and the negative electrode plate 13 is performed more efficiently, and the discharge efficiency of the battery cell 10 can be further improved.

  Note that the gas can be more effectively released by enlarging the protrusion 31 provided on the first side 30a on the upper side in the Y direction and widening the recess 311.

Next, the battery cell 10 of a 2nd modification is demonstrated with reference to Fig.10 (a), (b).
In the second modification, the same reference numerals are given to the same components as those in the third embodiment, and detailed description thereof is omitted. The battery cell 10 of the second modification is different from the third embodiment with respect to the shape of the protrusion 31.

That is, in the second modified example, as shown in FIG. 10A, the first battery cell 10a has a protrusion at the center of the second side 30b on the near side in the X direction on one opposing surface 30. 31 and a fitting projection 34 at the center of the second side 30b on the far side in the X direction.
The protrusion 31 is formed in a rectangular shape as in the first embodiment.
The fitting protrusion 34 is provided at the center of the second side 30b on the far side in the X direction. And the fitting protrusion part 34 protrudes from the opposing surface 30 in the U shape which faced the opening to the 2nd edge part 30b, and the rectangular protrusion part 31 fits in the opening part inside a U-shape. It is formed in size.
Further, the second battery cell 10b stacked on the first battery cell 10a has a back surface in the X direction on the facing surface 30 of the second battery cell 10b corresponding to the facing surface 30 of the first battery cell 10a. A projection 31 is provided at the center of the second side 30b on the side, and a fitting projection 34 is provided at the center of the second side 30b on the near side in the X direction.

  According to the battery cell 10 of the second modified example as described above, when the first battery cell 10a and the second battery cell 10b are stacked as shown in FIG. The protrusion 31 of the battery cell 10a and the fitting protrusion 34 of the second battery cell 10b fit together to move the first battery cell 10a and the second battery cell 10b in the X direction and the Y direction. It can be regulated. Therefore, the battery cell 10 can be laminated | stacked more stably than 2nd embodiment, and the battery module 1 can be formed easily.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the configurations and combinations of the embodiments in the embodiments are examples, and the addition and omission of configurations are within the scope not departing from the gist of the present invention. , Substitutions, and other changes are possible. Further, the present invention is not limited by the embodiments, and is limited only by the scope of the claims.

  The material used for the case 11 is not limited to the aluminum alloy used in the present embodiment, and a known metal material or resin material can be used. For example, if it is a metal material, aluminum, nickel alloy etc. will be mentioned, and if it is a resin material, polycarbonate, polyethylene, ABS resin, etc. will be mentioned.

Further, the battery cell 10 of the present invention is not limited to the battery cell 10 in which the electrode terminal 15 protrudes from the lid surface 110a. For example, as shown in FIG. 11, the electrode terminal 15 has a cylindrical shape along the X direction. The battery cell 10 having a shape and protruding from the side surface orthogonal to the lid surface 110a and the facing surface 30 one by one may be used.
Furthermore, the shape of the protrusion 31 of the present invention is not limited to that of the present embodiment, and may be, for example, a circular protrusion 31.

  In addition, the protrusions 31 provided on the opposing sides do not have to have the same shape and size, and the protrusions 31 having different shapes and sizes may be provided on each side. For example, the protrusion 31 provided on the lower first side 30a in the Y direction and the protrusion 31 provided on the upper first side 30a in the Y direction are limited to the same shape. Instead, the size and shape of the protrusion 31 provided on the first side 30a may be different between the lower side and the upper side in the Y direction.

Furthermore, the place where the protrusion 31 in the present invention is formed is not limited to either the first side 30a or the second side 30b, but both the first side 30a and the second side 30b. It is good also as a structure provided in. For example, it is not limited to any one of 1st embodiment and a 1st modification, It protrudes in both the 1st edge part 30a and the 2nd edge part 30b combining 1st embodiment and a 1st modification. The part 31 may be provided.
Furthermore, the place where the protrusion 31 in the present invention is formed is limited to the case where the protrusion 31 is provided at the center of at least one of a pair of opposing sides among the two pairs of opposing sides forming the opposing surface 30. For example, a plurality of protrusions may be provided at equal intervals on a pair of opposing sides, and in this case, the protrusions may not be provided at the center.
Moreover, although the battery cell 10 of this invention demonstrated taking the case of using as a battery module which laminated | stacked this battery cell 10 in multiple numbers, it is not restricted to this. For example, even when one battery cell 10 is used while being restrained by a restraint plate, a space is created between the battery cell 10 and the restraint plate because the protrusion 31 of the battery cell 10 is in contact with the restraint plate. Becomes a cooling air passage, and the cooling efficiency of the battery cell 10 can be further improved.

DESCRIPTION OF SYMBOLS 1 ... Battery module 10 ... Battery cell 20 ... Battery module case 21 ... Restraint plate 22 ... Restraint pin 23 ... Bottom plate 11 ... Case 12 ... Positive electrode plate 13 ... Negative electrode plate 14 ... Separator 15 ... Electrode terminal 110 ... Case main-body part 110a ... Cover Surface 110b ... Bottom 110c ... Side 30 ... Opposite surface 30a ... First side 30b ... Second side 31a ... Inclined protrusion 31b ... Reverse inclined protrusion 32 ... Adjacent protrusion 33 ... Filling protrusion 34 ... Fitting protrusion 10a ... first battery cell 10b ... second battery cell

Claims (8)

A substantially rectangular case,
Of the outer surface of the case, a protrusion that protrudes from at least one of the opposing surfaces facing each other in the stacking direction, and abuts against the other battery cell to be stacked,
A battery cell comprising:   2. The battery cell according to claim 1, wherein the projecting portion is provided at a center of at least one of the pair of facing sides of the two pairs of facing sides forming the facing surface. .   The battery cell according to claim 1, wherein a concave portion is formed on an inner surface of the case at a position where the protrusion is provided.   The protrusion is formed in a shape that regulates movement of the battery cells in at least one direction along the facing surface between the protrusion and the protrusion provided on the counterpart battery cell. The battery cell according to any one of claims 1 to 3.   5. The battery cell according to claim 1, wherein the protruding portion is provided so as to protrude across a side surface facing in a lateral direction orthogonal to the stacking direction and the facing surface. 6. .   2. The battery cell according to claim 1, wherein the protrusion is provided at the center of the facing surface with only the outer surface protruding while the inner surface of the case is flat. 3.   A battery module comprising a plurality of the battery cells according to any one of claims 1 to 6 stacked.   The battery module according to claim 7, wherein the battery cells are stacked such that the protrusion and the protrusion provided on the mating battery cell are in contact with each other.

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