KR100696637B1 - Secondary battery module and wall of secondary battery module - Google Patents

Abstract

According to the present invention, a plurality of unit cells, two plate members protruding with protrusions formed on the surface thereof, and at least one joint portion protruding from the contact surface of the plate member, are formed on the plate so as to prevent welding failure of the battery partition wall. It provides a secondary battery module including a battery partition wall is installed between the unit cells, including the fitting portion is fitted.

Battery bulkhead, plate, junction, fitting, interference fit, groove

Description

Separation wall between secondary battery module and secondary battery module {SECONDARY BATTERY MODULE AND WALL OF SECONDARY BATTERY MODULE}

1 is an exploded perspective view illustrating a configuration of a secondary battery module according to an embodiment of the present invention.

2 is a schematic side cross-sectional view illustrating a configuration of a secondary battery module according to an embodiment of the present invention.

3 is a perspective view illustrating a part of a partition wall of a rechargeable battery module according to an exemplary embodiment of the present invention.

4 and 5 are cross-sectional views illustrating a partition wall assembled state of a rechargeable battery module according to an exemplary embodiment of the present invention.

6 is a perspective view illustrating a part of a partition of a rechargeable battery module according to still another embodiment of the present invention.

7 and 8 are cross-sectional views illustrating a partition wall assembled state of a rechargeable battery module according to still another exemplary embodiment of the present invention.

The present invention relates to a secondary battery module. In more detail, the present invention relates to a secondary battery module and its partition wall, which can be easily manufactured and minimize manufacturing defects by improving the structure of battery partition walls installed between unit cells.

A secondary battery is a battery that can be charged and discharged unlike a primary battery that is not rechargeable.

Low-capacity secondary batteries are used in portable electronic devices such as phones, notebook computers, and camcorders, and large-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles.

The secondary battery is manufactured in various shapes. As a typical shape of a secondary battery, a cylindrical shape and a square shape are mentioned. In order to be used for driving a motor such as an electric vehicle, which requires a large power, the high-output secondary battery described above is configured with a plurality of secondary batteries connected in series.

As described above, one large capacity secondary battery (hereinafter, referred to as a battery module for convenience of description throughout) is composed of a plurality of secondary batteries (hereinafter, referred to as unit cells for convenience of explanation throughout) in series.

Each unit cell includes an electrode assembly having a positive electrode plate and a negative electrode plate interposed therebetween, a case having a space portion in which the electrode assembly is embedded, a cap assembly coupled to the case and sealing the protruding portion. And positive and negative terminals electrically connected to the positive and negative current collectors provided in the electrode assembly.

A plurality of the unit cells are arranged in a row, and a battery module is formed by connecting a conductor through a nut between the negative terminal and the positive terminal of a neighboring unit cell.

In this case, the battery module is configured to connect one to many dozens of unit cells to form one battery module, so that the heat generated from each unit battery can be easily discharged, and moreover, it can be applied to a hybrid electric vehicle (HEV). In the case of secondary batteries, heat dissipation is of paramount importance.

When heat is not released properly, for example, the heat generated from each unit cell causes an increase in the temperature of the battery module, resulting in a malfunction of the device to which the battery module is applied.

Accordingly, in the case of configuring a battery module including a plurality of unit cells, in particular, a rectangular secondary battery, a battery partition wall is installed between the unit battery and the unit battery to secure a gap for distributing cooling medium between the unit cells, This prevents deformation of the unit cell.

In recent years, the battery partition wall has a structure in which a plurality of protrusions are formed on a plate for smooth distribution and strength of a cooling medium.

However, the battery partition wall of the above structure has a problem in that a bonding failure occurs in the process of forming a single battery partition wall by joining two plate materials.

This is because it is difficult to match the position of the two plates, as the position of the stone period formed in each plate is shifted, the welding failure between the plates occurs.

Therefore, due to the poor structure of the battery partition, the cooling medium is not properly distributed, the heat dissipation characteristics of the battery module is degraded, the battery life is reduced due to the weakening of the battery partition strength.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a battery partition wall of a secondary battery module and a secondary battery module that can prevent the welding failure of the battery partition wall.

In order to achieve the above object, the battery module of the present invention includes a plurality of unit cells, a housing in which the unit battery is built and a temperature control cooling medium is distributed, and a battery partition wall installed between the unit cells, wherein the battery partition wall It may include two plate members protrudingly formed on the surface of the silver to contact each other, a joint portion protruding at least one or more to each plate and a fitting portion to which the joint portion is fitted.

In this case, it is preferable that the junction portion is formed by extending one side outward.

In addition, the fitting portion is preferably made of a groove into which the bonding portion is fitted.

In addition, the junction is preferably coupled to the fitting portion by interference fit.

Accordingly, by attaching the junction portion to the fitting portion it is possible to fix both plates.

In addition, the two plates constituting the battery partition wall is preferably placed in a state in which the projections face each other is attached to the welding in a state where each projection is in contact.

In addition, each plate may be attached by welding only between the joint formed in the plate and the other side formed in the plate.

In addition, the present invention is that each plate of the battery partition wall is made of the same shape and the junction portion and the fitting portion may be formed on the surface is not formed projections. Preferably, the number of joining portions and fitting portions are formed at the corners of the battery partition wall.

In addition, the joining portion formed on one side plate is formed at a height that extends to the bottom of the fitting portion formed on the other plate in a state where two plate materials are in contact with each other so that the joining portion and the fitting portion are in contact with each other when the two plates are joined. It is preferable to.

The protrusion and the junction may be a hollow structure or a hollow structure.

On the other hand, the present invention is a plate member constituting the battery partition is formed in a rectangular shape corresponding to the unit cell of the square and the projections are formed on the front surface is arranged by a predetermined interval protruding and the junction is protruded formed on both corners of one side tip The front edge has a structure in which a fitting portion is formed in which a joint part of the other plate member is fitted when two plate members contact each other.

Accordingly, the two plates can be easily joined by forcibly fitting the joints to the fitting portions in the state where the two plates face each other so that the protrusions come into contact with the protrusions.

Of course, the present invention is not limited to the edge of the plate in the forming position of the joining portion and the fitting portion, and can be formed in any part of the plate as long as the joining portion is in contact with the plate when a pair of plate is joined.

In addition, the present invention may be formed of a plate structure in which the bonding portion formed in the plate member extends along the one end of the plate member. And the fitting portion may be formed in a form corresponding to the outer end of the junction portion of the plate structure form on the front end of the plate facing the junction.

Here, the plate structure is preferably disposed in the direction of travel of the cooling medium so as not to interfere with the progress of the cooling medium.

In addition, each of the protrusions is preferably formed to protrude in the same direction with respect to the battery partition wall.

In addition, the protrusion may be formed in a hemispherical shape, the cross-sectional shape is a circular or polygonal cylindrical shape, or a trapezoidal shape consisting of a trapezoidal side cross section, or a polygonal pyramid such as cone, triangular pyramid or square pyramid.

In addition, the junction portion and the fitting portion is formed in a cross-sectional shape corresponding to each other and is not particularly limited in the form, for example, a trapezoidal shape consisting of a circular or polygonal tubular shape or a side cross section of a trapezoidal shape or a polygonal pyramid such as a cone, a triangular pyramid or a square pyramid. It may be made of.

Here, the secondary battery module is an energy source for driving a motor of the device in a device that operates by using a motor such as a hybrid electric vehicle (HEV), an electric vehicle (EV), a wireless cleaner, an electric bicycle, an electric scooter, and the like. Can be used

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a schematic side cross-sectional view showing a configuration of a battery module according to an embodiment of the present invention.

Referring to the drawings, the battery module 10 according to the present embodiment is a large-capacity battery module, and includes a plurality of unit cells 11 continuously arranged at a predetermined interval.

In the following embodiment, a case where a rectangular unit cell is used as the unit cell 11 will be described.

Each of the unit cells 11 is a secondary battery having a conventional structure that charges and discharges a predetermined amount of electric power by providing an electrode assembly in a rectangular case having a positive electrode and a negative electrode disposed on both sides thereof with a separator interposed therebetween. The battery partition wall 20 is provided between the unit cells 11 to maintain a gap between the unit cells 11 and to distribute a cooling medium between the unit cells 11.

Therefore, in the present exemplary embodiment, the plurality of unit cells 11 are continuously arranged at regular intervals by the battery partition wall 20 disposed between the unit cells to form a battery assembly.

As shown in FIG. 1, the battery assembly includes a pair of end plates 30 closely contacting the outer surface of the unit cell 11 positioned at the outermost side of the battery assembly among the unit cells 11 constituting the battery assembly. It is in close contact with each other, and fixed by a connecting rod 35 connecting each end plate 30 and a nut 36 fastened to the tip of the connecting rod 35 to form one battery module 10.

As shown in FIG. 1, the end plate 30 has a size corresponding to the front surface of the unit cell 11 and is in close contact with the front surface of the unit cell, and an upper end of the flat plate member 32. And a fastening member 31 which is formed integrally with each other and protrudes outward.

Here, look at the installation structure of the fastening member 31 and the connecting rod 35 in more detail, the front of the fastening member 31 is formed with a hole 34 is fitted with a connecting rod 35 is the hole ( The connecting rod 35 penetrates through 34 and is coupled thereto.

Accordingly, when the connecting rod 35 is inserted through the hole 34 formed in the fastening member 31, and the nut 36 is fastened to the screw thread formed at the tip of the connecting rod 35, the battery assembly is placed on both sides of the battery assembly. As the end plate 30 is shown in FIG. 2, the unit cells 11 and the battery partition walls 20 may be tightened to fix the unit cells.

In the battery module 10 having the above-described structure, the battery partition wall 20 according to the present exemplary embodiment includes two plate members 21 having sizes corresponding to those of the side surfaces of the unit cells 11.

Each of the plate members 21 has a plurality of protrusions 22 formed on the surface thereof at regular intervals, so that when the two plate members 21 are joined, the protrusions 22 formed on the plate members 21 are in contact with each other. A space is formed between the two plate members 21, and air, which is a cooling medium, flows through the space between the protrusions 22.

Here, the plate will be described in more detail with reference to FIG. 3.

According to the present embodiment, since the two plate members 21 forming the battery partition wall 20 have the same structure and shape, the following description will be made based on one plate member 21.

The plate 21 is formed with a plurality of protrusions 22 protrude in one direction at a predetermined interval on the surface, the joint portion 23 is formed at both corners of the one end is deformed.

The joining portion 23 is formed to be at least twice as high as the height of the protrusion 22 and protrudes in the same direction as the protrusion direction of the protrusion 22.

In addition, both ends of the other end of the plate 21 has a structure in which grooves 24 into which the ends of the joining portions 23 of the plate 21 facing each other when the two plates 21 are joined are formed. .

Here, the joining portion 23 is formed at a height extending to the bottom surface of the groove 24 of the facing plate 21 so that when the two plate 21 are joined in a state in which the protrusions 22 face the protrusions 22. The front end of each contact between the protrusions 22, the front end of the joint 23 is fitted into the groove 24 of the opposite plate member 21 can be in close contact with the bottom of the groove.

In addition, the groove 24 is made of the same shape as the tip shape of the junction 23 and the size is formed slightly smaller than the size of the junction 23 so that the junction 23 is fitted in the interference fit type. It is.

Therefore, as shown in FIG. 4, the two plate members 21 may be fixedly coupled to each other while the joining portion 23 is inserted into the groove 24.

In addition, the ultrasonic wave between the two members 21 by ultrasonic welding between the two members in the state in which the joint 23 of the one side plate 21 is fitted into the groove 24 of the other plate 21 so as to increase the bonding force of the two plate 21. The two plate members 21 are bonded to each other to form one battery partition wall 10.

According to the present embodiment, the protrusion 22 and the junction 23 have a hollow structure as shown in FIG. 4.

According to another embodiment of the present battery module in addition to such a structure, the interior of the protrusion 22 and the junction 23 is made of the same material as the plate material 21 as shown in FIG.

In the above structure, the two plates 21 are joined together by simply fitting the joints 23 into the grooves 24 so that the alignment state of the two plates can be easily combined and the structure larger than the protrusions 22. Welding is made through the joint 23 to facilitate the welding operation and to prevent the welding failure.

In addition, in consideration of the structure in which the two plates 21 are welded by ultrasonic welding, the thickness of the plate 21 and the joint 23 to be welded as described above is different, so that welding can be performed properly.

This is because, in the case of ultrasonic welding, the welding is performed properly only when the thicknesses of the welding regions between the two members to be welded are different from each other.

In this way, the two plates 21 are coupled by interference fit and welded to each other, so that the upper ends of the protrusions 22 formed on the plate 21 closely adhere to each other, thereby maintaining the shape between the plate members 21 and the protrusions 22. And through the passage made between the projection 22 will be able to smoothly escape the air for cooling.

According to the present embodiment, the shape of the protrusion 22 is formed in a trapezoidal shape in which the end surface is inclined trapezoidal shape and the upper end is formed in a circular shape, and the joining part 23 also differs only in the size of the protrusion 22 and the protrusion 22. In the same form.

In addition, although not shown, the protrusion 22 may be in the form of a hemispherical shape or a cylindrical or square cylinder having a circular or square shape at the top, or a polygonal pyramid such as a cone, a triangular pyramid, or a square pyramid.

Although the joining portion 23 is also not shown, the tip is in a planar shape and can be joined to the bottom of the groove 24 of the plate 21 without being limited to the shape thereof. For example, a cylindrical or polygonal cylindrical shape or The side cross section may be formed in a trapezoidal shape consisting of a trapezoid or a polygonal pyramid such as a cone, a triangular pyramid or a square pyramid.

6 shows another embodiment of the battery partition wall.

According to the above drawings, the two plate members constituting the battery partition wall 20 is formed with a plurality of protrusions 22 protrude in one direction at a predetermined interval on the surface, along one side edge of the front surface protruding protrusions The junction portion 25 in the form of an elongated plate structure protrudes, and has a structure in which a channel-shaped long groove 26 corresponding to the junction portion is formed along the opposite edge of the plate member 21 with respect to the junction portion 25. have.

In this case, the junction part 25 in the form of a plate structure extends along the edge of the plate 21 so that the cooling medium cannot proceed to the place where the junction part 25 is installed. Therefore, the junction part 25 is preferably disposed so as to lie parallel to the traveling direction of the cooling medium so as not to interfere with the progress of the cooling medium.

In addition, the joining portion 25 is formed at a height extending to the bottom surface of the groove 26 of the facing plate 21 so that when the two plate 21 is joined in a state in which the protrusions 22 face the protrusions 22. Each end is in contact with the projection 22 and the tip of the junction portion 25 is fitted in the long groove 26 of the opposite plate 21 can be in close contact with the bottom of the long groove.

The long groove 26 extends in the form of a channel along the edge of the plate 21 so as to correspond to the junction 25, and has the same shape as the tip of the junction 25, the size of which is the junction. It is formed slightly smaller than the size of (25) and has the structure which the said junction part 25 fits in the long groove 26 by interference fit.

Therefore, as shown in FIG. 7, the two plate members 21 can be fixedly coupled to each other while the joining portion 25 is inserted into the long groove 26.

In addition, the ultrasonic wave between the two members 21 by ultrasonic welding between the two members in the state in which the joining portion 25 of the one side plate 21 is fitted in the long groove 26 of the other plate 21 so as to increase the coupling force of the two plate 21. The two plate members 21 are bonded to each other to form one battery partition wall 10.

According to the present embodiment, the protrusions 22 and the junction part 25 have a hollow structure as shown in FIG. 7.

According to another embodiment of the present battery module in addition to such a structure, as shown in FIG. 8, the protrusion 22 and the inside of the junction part 25 are filled with the same material as the plate material 21.

In the structure described above, the two board members 21 can be easily aligned by aligning the alignment state of the two plates just by inserting the joint 25 into the long groove 26.

The above-described battery module of the present invention can be effectively used as a battery for HEV requiring high output / large capacity, but its use is not necessarily limited to HEV.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to

Thus, according to the present embodiment, it is possible to easily manufacture the battery partition, it is possible to increase the assemblage of the two plates forming the battery partition and to minimize the defective bonding.

Accordingly, deformation of the unit cell can be prevented and heat exchange efficiency can be increased.

Claims (19)

With a plurality of unit cells, The unit cell including two plate members protruding from and contacting a surface, at least one joint part integrally formed on one side of the contact surface of the plate member and protruding outwardly, and a groove formed in the plate member and into which the joint part is fitted. Battery bulkhead installed between Secondary battery module comprising a. delete According to claim 1, The junction part is a secondary battery module coupled to the fitting portion by interference fit. According to claim 1, The plate member is placed in a state in which the projections face each other, the secondary battery module having a structure in contact with each projection. According to claim 1, The two plate materials are attached to the secondary battery module by welding. According to claim 1, The two plate material is a secondary battery module is welded and attached between the joint formed on the one side plate and the fitting portion formed on the other side plate. According to claim 1, The junction part secondary battery module is formed with one side protrusion is extended to the outside. According to claim 1, The junction part is a secondary battery module made of a plate structure extending along one edge of the plate material. The method of claim 8, The fitting part is a secondary battery module consisting of a long groove of a size corresponding to the junction of the plate structure form. According to claim 1, The protrusion or the junction portion of the secondary battery module having a structure filled inside. According to claim 1, The protrusion or the junction part is a secondary battery module having a hollow structure. According to claim 1, The plate is formed in a rectangular shape corresponding to the rectangular unit cell, and the protrusions are formed to protrude at a predetermined interval on the front surface, and the joints are formed to protrude from both corners of one end, and two plates are in contact with opposite edges. When the secondary battery module of the structure forming a bonding surface so that the bonding portion of the other side of the plate close. According to claim 1, The battery module is a secondary battery module for driving a motor. A pair of plate members facing each other so that the protrusions are formed to face each other so as to protrude from the surface, A joint formed integrally on one side of one side plate and protruding in the same direction as the protrusion to contact the other side plate, A groove formed at a position corresponding to the junction of the other side plate and fitted with the junction Battery partition wall of the secondary battery module comprising a. delete The method of claim 14, The junction part of the battery partition wall of the secondary battery module is coupled to the fitting by force fit. The method of claim 14, The junction part of the battery partition wall of the secondary battery module, wherein one side protrusion is extended to the outside. The method of claim 14, The junction part battery partition wall of the secondary battery module formed in the form of a plate structure extending along one edge of the plate material. The method of claim 18, The fitting portion is a battery partition wall of the secondary battery module consisting of a long groove of a size corresponding to the joining portion of the plate structure form.

Images