Title of invention: Battery module with end frame
Technical field
[One]
The present invention relates to a battery module having an end frame, and more particularly, to a battery module with improved weldability for bonding between a module housing and an end plate.
[2]
This application is an application for claiming priority for Korean Patent Application No. 10-2017-0161954 filed on November 29, 2017, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
Background
[3]
Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries, among which lithium secondary batteries have little memory effect compared to nickel-based secondary batteries, so charging and discharging are free. The self-discharge rate is very low and the energy density is high.
[4]
These lithium secondary batteries mainly use lithium-based oxides and carbon materials as a positive electrode active material and a negative electrode active material, respectively. A lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate to which the positive electrode active material and the negative electrode active material are applied, respectively, are disposed with a separator therebetween, and a case material for sealing and receiving the electrode assembly together with an electrolyte solution, that is, a battery pouch case material.
[5]
In general, lithium secondary batteries may be classified into can-type secondary batteries in which an electrode assembly is embedded in a metal can, and pouch-type secondary batteries in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet, depending on the shape of the exterior material.
[6]
In recent years, secondary batteries are widely used not only in small devices such as portable electronic devices, but also in mid- to large-sized devices such as automobiles and power storage devices. When used in such a medium-sized device, a large number of secondary batteries are electrically connected to increase capacity and output. In particular, pouch-type secondary batteries are widely used in such medium-sized devices due to the advantage of easy stacking.
[7]
Meanwhile, in the prior art, in the configuration of the battery module, a module housing for accommodating a plurality of secondary batteries, and a front plate and a rear plate configured to seal the front and rear of the module housing are provided.
[8]
Here, when the module housing is manufactured as an integral type, it is mainly manufactured using an extrusion method. On the other hand, the front plate and the rear plate need to be spherical in a complex shape because various parts are mounted, and for this purpose, they are generally manufactured through a die-casting method.
[9]
However, when laser welding the front plate and the rear plate to the end of the module housing to seal the module housing, the front plate and the rear plate manufactured by the casting method have internal irregular pores, so during welding with the module housing Rupture or fracture may occur, and because of poor internal uniformity, it is difficult to set welding conditions and cause many welding defects.
[10]
Accordingly, when fabricating the front and rear plates applied to the conventional battery module using a press method, it is difficult to implement a complex shape, and thus, there is a limit to mounting various parts on the plate or providing functions.
[11]
Therefore, there is a need for a technology capable of solving the problems of the prior art described above.
Detailed description of the invention
Technical challenge
[12]
Accordingly, an object of the present invention is to provide a battery module with improved weldability for bonding between a module housing and an end plate, as invented to solve the above problems.
[13]
Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be easily understood that the objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.
Means of solving the task
[14]
The battery module according to the present invention for achieving the above object,
[15]
A cell assembly including a plurality of secondary batteries;
[16]
A module housing having one or more side walls and configured to accommodate the cell assembly in an inner space defined by the side walls; And
[17]
A body frame having a main wall and at least one side wall extending in a direction in which the module housing is located from an outer circumference of the main wall, and one side is coupled and fixed to the side wall of the main frame, and the other side is a front end or a rear of the module housing. It may include an end frame having a bonding plate configured to be coupled to the end.
[18]
In addition, the bonding plate may include a body portion coupled to a side wall of the body frame, and a step portion extending from a side end portion of the body portion so as to have a step difference with the body portion and in close contact with the inner surface of the module housing.
[19]
Further, at least one fixing protrusion protruding in a direction in which the stepped portion is located may be formed on an inner surface of the module housing facing the stepped portion.
[20]
In addition, at least one recessed fixing groove may be formed in the stepped portion so that the fixing protrusion of the module housing is inserted.
[21]
Further, the stepped portion may extend from the main body portion of the bonding plate to be inclined in a direction in which the inner surface of the module housing is located to press the inner surface of the module housing.
[22]
In addition, at least one fixing hole may be formed in the body portion of the bonding plate so that a portion of the sidewall of the body frame is embedded.
[23]
In addition, in the main body of the bonding plate, a recess portion may be formed in which a portion of the outer surface is inserted in an inner direction and the recessed portion extends from one end to the other end.
[24]
In addition, a part of the sidewall of the main body frame may be embedded in the indented portion to form a buried fixing portion.
[25]
Further, the indentation may be formed at a side end of the main body that is not in contact with the stepped portion.
[26]
In addition, the indentation may extend from the center of the main body of the bonding plate to both side ends.
[27]
Moreover, the battery pack according to the present invention for achieving the above object may include at least one battery module.
[28]
And, the vehicle according to the present invention for achieving the above object may be provided with the present battery pack.
Effects of the Invention
[29]
According to an aspect of the present invention, in the bonding plate provided in the battery module, the main body portion having a surface relatively wider than the side portion is coupled to one side wall of the main body frame, so that the bonding plate is high bonding force with the main frame. There is an advantage that can be combined.
[30]
In addition, according to an aspect of the present invention, the fixing protrusion of the module housing and the fixing groove of the stepped portion are coupled to each other, so that the bonding plate can be guided to be positioned at a proper position on the inner surface of the module housing, thereby facilitating the installation process. In addition, welding between the stepped portion and the module housing becomes easier, so that welding reliability can be improved.
[31]
Moreover, according to this aspect of the present invention, by manufacturing the body frame by a casting method without using a separate fastening member, the bonding plate and the body frame can be fastened with a strong binding force. Accordingly, according to the present invention, not only can the number of parts be reduced to reduce the manufacturing cost, but also the fastening operation can be omitted, thereby shortening the manufacturing time and forming a stable coupling structure.
[32]
And, according to an aspect of the present invention, as the fixing part embedded on the outer surface of the bonding plate is formed integrally with the main body frame, when the bonding plate is inserted into the module housing, the stepped portion is pressed toward the center of the end frame. Thereby, it is possible to effectively prevent the bonding plate from being detached from the body frame.
[33]
Further, according to one aspect of the present invention, the slit or welding guide line formed in the module housing can effectively transfer heat to the stepped portion of the bonding plate during a welding process between the stepped portion of the bonding plate and the module housing, It is possible to effectively shorten the time of the welding process and increase the bonding reliability.
[34]
In addition, in the prior art, when the front plate or the rear plate manufactured by the casting method is welded to the module housing, irregular pores are inherent in the plate, and rupture or breakage occurs during welding, which is liable to cause welding failure.
[35]
However, according to an aspect of the present invention, by forming the body frame required to form the complex structure of the present invention by a casting method, and forming a bonding plate welded to the module housing by pressing or extrusion instead of casting, the It is possible to effectively reduce defects generated in the welding process between the module housing and the end frame, and improve weldability.
Brief description of the drawing
[36]
The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of ​​the present invention together with the detailed description of the present invention to be described later. It is limited only to and should not be interpreted.
[37]
1 is a perspective view schematically showing a battery module according to an embodiment of the present invention.
[38]
2 is an exploded perspective view schematically showing components of a battery module according to an embodiment of the present invention by separating them.
[39]
3 is a partial cross-sectional view schematically showing a cross-sectional view of the battery module taken along line A-A' of FIG. 1.
[40]
4 is a perspective view schematically showing a bonding plate, which is a part of a battery module according to an embodiment of the present invention.
[41]
5 is a partial vertical cross-sectional view schematically showing a module housing and a bonding plate for a battery module according to another embodiment of the present invention.
[42]
6 is a side view schematically showing a bonding plate, which is a part of a battery module according to another embodiment of the present invention.
[43]
7 is a perspective view schematically showing an end frame that is a part of a battery module according to an embodiment of the present invention.
[44]
FIG. 8 is a vertical cross-sectional view schematically illustrating a cross-sectional view of the battery module taken along line B-B' of FIG. 7.
[45]
9 is a perspective view schematically showing an end frame for a battery module according to another embodiment of the present invention.
[46]
FIG. 10 is a vertical cross-sectional view schematically illustrating a cross-sectional view of the battery module taken along line C-C' of FIG. 9.
[47]
11 is a perspective view schematically showing an end frame for a battery module according to another embodiment of the present invention.
[48]
12 is a vertical cross-sectional view schematically showing a cross-sectional view of the battery module taken along line D-D' of FIG. 11.
[49]
13 is a perspective view schematically showing some configurations of a battery module according to another embodiment of the present invention.
[50]
14 is a perspective view schematically showing some components of a battery module according to another embodiment of the present invention.
Mode for carrying out the invention
[51]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to describe their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of ​​the present invention.
[52]
Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention. It should be understood that there may be equivalents and variations.
[53]
1 is a perspective view schematically showing a battery module according to an embodiment of the present invention. And, Figure 2 is an exploded perspective view schematically showing the components of the battery module according to an embodiment of the present invention separated.
[54]
Referring to FIGS. 1 and 2, a battery module 200 according to an embodiment of the present invention includes a cell assembly 100, a module housing 220, and an end frame 230.
[55]
Here, the cell assembly 100 may include a plurality of secondary batteries 110. In addition, the secondary battery 110 may be a pouch-type secondary battery 110. In particular, the pouch-type secondary battery 110 may include an electrode assembly, an electrolyte, and a pouch case.
[56]
Here, the electrode assembly may be configured in a form in which at least one positive electrode plate and at least one negative electrode plate are disposed with a separator therebetween. More specifically, the electrode assembly may be divided into a winding type in which one positive plate and one negative plate are wound together with a separator, and a stack type in which a plurality of positive plates and a plurality of negative plates are alternately stacked with a separator interposed therebetween. .
[57]
In addition, the pouch exterior material may be configured to include an outer insulating layer, a metal layer, and an inner adhesive layer. Such a pouch exterior material may be configured in a form including a metal thin film, such as an aluminum thin film, to protect internal components such as an electrode assembly and an electrolyte, and to supplement electrochemical properties by the electrode assembly and an electrolyte, and to improve heat dissipation. have. In addition, such an aluminum thin film is interposed between insulating layers formed of an insulating material in order to secure electrical insulation from components inside the secondary battery 110 such as an electrode assembly and an electrolyte or other components outside the secondary battery 110. May be intervened.
[58]
In particular, the pouch exterior material may be composed of two pouches, and at least one of them may have a concave inner space. In addition, the electrode assembly may be accommodated in the inner space of the pouch. Further, a sealing part is provided on the outer circumferential surfaces of the two pouches so that the sealing parts are fused to each other, so that the inner space in which the electrode assembly is accommodated may be sealed.
[59]
Each pouch-type secondary battery 110 may include an electrode lead 111, and the electrode lead 111 may include a positive electrode lead and a negative electrode lead.
[60]
More specifically, the electrode lead 111 may be configured to protrude forward or backward from a sealing portion located at an outer periphery of the pouch exterior material. Further, such an electrode lead 111 can function as an electrode terminal of the secondary battery 110. For example, as shown in FIG. 2, one electrode lead 111 may be configured to protrude forward from the secondary battery 110, and the other electrode lead 111 may be formed in the secondary battery 110. ) Can be configured to protrude from the rear.
[61]
Accordingly, according to this configuration of the present invention, in one secondary battery 110, there is no interference between the positive electrode lead and the negative electrode lead, so that the area of ​​the electrode lead 111 can be increased, and the electrode lead 111 and the bus The welding process between the bars may be performed more easily.
[62]
In addition, a plurality of pouch-type secondary batteries 110 may be included in the battery module 200 and may be arranged to be stacked in at least one direction. For example, as shown in FIG. 2, a plurality of pouch-type secondary batteries 110 may be stacked side by side in a left and right direction. At this time, each pouch-type secondary battery 110, when viewed in the F direction, has two wide surfaces respectively located on the left and right sides, and is erected substantially perpendicular to the ground so that sealing parts are located at the top and bottom, front and rear. Can be arranged in shape. In other words, each secondary battery 110 may be configured to be erected in a vertical direction.
[63]
Meanwhile, terms representing directions such as before, after, left, right, up, and down described in the present specification may vary depending on the position of the observer or the shape of the object. However, in the present specification, for convenience of description, directions such as front, rear, left, right, up, and down are indicated separately based on when viewed in the F direction.
[64]
The configuration of the pouch-type secondary battery 110 described above is obvious to those skilled in the art to which the present invention belongs, and thus a more detailed description thereof will be omitted. In addition, various secondary batteries 110 known at the time of filing of the present invention may be employed in the cell assembly 100 according to the present invention.
[65]
Meanwhile, the module housing 220 may function as an exterior material in the battery module 200. Accordingly, the module housing 220 imparts structural stability to the battery module 200 and protects components housed inside such as the cell assembly 100 from other external physical elements such as impacts or substances. Plays a role. To this end, the module housing 220 may be made of a metal material such as steel or aluminum.
[66]
In particular, when the module housing 220 is made of a metal material including aluminum, heat generated from the cell assembly 100 can be effectively discharged to the outside of the module housing 220 by using the high thermal conductivity of aluminum.
[67]
In addition, the module housing 220 may include one or more sidewalls 220a, 220b, 220c, 220d.
[68]
Specifically, the sidewalls 220a, 220b, 220c, and 220d may have a structure that is connected to each other when a plurality of sidewalls 220a, 220b, 220c, 220d are formed. For example, the side walls 220a, 220b, 220c, 220d are, when viewed in the F direction, the upper wall 220a, the lower wall 220b, the left wall 220c, and the right wall based on the cell assembly 100. (220d) may be provided, and the walls 220a, 220b, 220c, 220d may be connected to each other.
[69]
In addition, the module housing 220 may have an inner space defined by the side walls 220a, 220b, 220c, and 220d to accommodate the cell assembly 100. Specifically, the internal space may have an internal structure corresponding to an external shape of the cell assembly 100.
[70]
For example, as shown in FIG. 2, the module housing 220 has an upper wall of the module housing 220 so as to accommodate the cell assembly 100 formed of a rectangular parallelepiped in an approximate overall shape. 220a) and the lower wall 220b may be connected to each other to form a right angle to the left wall 220c and the right wall 220d.
[71]
Further, the inner space so that at least one of the upper wall 220a, the lower wall 220b, the left wall 220c, and the right wall 220d of the module housing 220 contacts at least one or more side surfaces of the cell assembly 100. Can be provided. That is, as the area in which the side walls 220a, 220b, 220c, 220d of the module housing 220 and the outer surface of the cell assembly 100 directly contact increases, the heat generated in the cell assembly 100 is effectively reduced to the module housing 220 ) Can be evangelized.
[72]
For example, as shown in FIG. 2, the module housing 220 includes an upper wall 220a, a lower wall 220b, and a left wall so as to be in contact with the upper, lower, left, and right surfaces of the cell assembly 100. (220c) and the right wall 220d may be formed.
[73]
In addition, the module housing 220 may have a hollow structure in which the inner space is opened in both directions. Specifically, the hollow structure may be configured to have a structure in which the inner space is opened along the arrangement direction of the battery modules 200 when the plurality of battery modules 200 are arranged in the front-rear direction.
[74]
More specifically, the module housing 220 may be configured as a mono frame in which an upper wall 220a, a lower wall 220b, a left wall 220c, and a right wall 220d are integrated.
[75]
Here, the integrated form means a form in which one body is formed using a casting method or the like. Specifically, the module housing 220 may have a structure in which both ends of the upper wall 220a, the lower wall 220b, the left wall 220c, and the right wall 220d are connected to each other.
[76]
For example, as shown in Figure 2, the module housing 220, the front and rear direction is open, and both ends of the upper wall 220a, the lower wall 220b, the left wall 220c, and the right wall 220d are It can be configured as a connected square tube.
[77]
Accordingly, according to this configuration of the present invention, the module housing 220 is formed so as to surround the side surface of the cell assembly 100, and thus generated in the cell assembly 100 when charging and discharging the battery module 200 Heat can be effectively radiated to the outside.
[78]
Referring back to FIGS. 1 and 2, the end frame 230 may include a body frame 232 and a bonding plate 236.
[79]
Here, the body frame 232 may include a main wall 232a. That is, the main wall 232a may have a plate shape that is upright in the vertical direction. Further, a module terminal (not shown) may be provided on the main wall 232a to establish an electrical connection between the cell assembly 100 and an external device.
[80]
Further, the main body frame 232 may include one or more side walls 233 extending from an outer periphery of the main wall 232a in a direction in which the module housing 220 is located. Specifically, in the main frame 232, when viewed in the F direction, the main wall 232a has an upper wall 233a, a lower wall 233b, a left wall 233c, and a right wall ( 233d). Moreover, the sidewalls 233a, 233b, 233c, and 233d may be connected to each other.
[81]
Moreover, the main body frame 232 may serve as an exterior material in the battery module 200. Accordingly, the main body frame 232 imparts structural stability to the battery module 200 and protects components housed inside such as the cell assembly 100 from other external physical elements such as impacts or substances. Plays a role. To this end, the body frame 232 may be made of a metal material such as steel or aluminum. Alternatively, the body frame 232 may be made of an electrically insulating material. For example, the body frame 232 may be made of a plastic material. For example, it may be a polyvinyl chloride (PVC) material.
[82]
Furthermore, one side of the bonding plate 236 may be coupled and fixed to the side wall 233 of the main frame 232. That is, based on a line in the left and right direction at a predetermined position on the bonding plate 236, it can be divided into a front portion and a rear portion, and a front portion or a rear portion of the bonding plate 236 is a side wall of the body frame 232 It can be fixed to the outer surface of the 233.
[83]
In addition, the bonding plate 236, when the front portion of the bonding plate 236 is coupled and fixed to the outer surface of the side wall 233 of the body frame 232, the rear portion of the module housing 220 It can be configured to be combined. Conversely, when the rear portion of the bonding plate 236 is coupled and fixed to the outer surface of the side wall 233 of the main frame 232, the front portion may be configured to be coupled to the rear end of the module housing 220.
[84]
Moreover, the bonding plate 236 may be made of a metal material such as steel or aluminum.
[85]
3 is a partial cross-sectional view schematically showing a cross-sectional view of the battery module taken along line A-A' of FIG. 1. And, Figure 4 is a perspective view schematically showing a bonding plate that is a part of the configuration of the battery module according to an embodiment of the present invention.
[86]
2 to 4, the bonding plate 236 may include a body portion 237 coupled to the sidewall 233 of the body frame 232. Here, the main body 237 may have a plate shape in which upper and lower surfaces are relatively wider than side surfaces. For example, the body portions 237 of the four bonding plates 236 are coupled to each of the four side walls 233a, 233b, 233c, and 233d of the main frame 232.
[87]
Accordingly, according to this configuration of the present invention, the bonding plate 236 has a body portion 237 having a surface relatively wider than a side portion and is coupled to one side wall 233 of the body frame 232, so that the There is an advantage that the bonding plate 236 can be coupled with the body frame 232 with a high bonding force.
[88]
Further, the bonding plate 236 may include a stepped portion 239 having a stepped structure extending from the body portion 237 in the center direction of the end frame 230. In addition, the stepped portion 239 may extend from a side end portion of the body portion 237 so as to be in close contact with the inner surface of the module housing 220.
[89]
For example, as shown in FIGS. 3 and 4, the bonding plate 236 coupled to the upper wall 233a of the main frame 232 includes a main body 237 and a main body 237. ) Is provided with a step portion 239 extending from. In addition, the stepped portion 239 may be inserted into the inner space of the module housing 220 so that the upper surface is in close contact with the inner surface of the module housing 220.
[90]
5 is a partial vertical cross-sectional view schematically showing a module housing and a bonding plate for a battery module according to another embodiment of the present invention.
[91]
Referring to FIG. 5, compared with the configuration of the module housing 220 of FIG. 3, the inner surface of the module housing 220A facing the stepped portion 239A, in a direction in which the stepped portion 239A is located. At least one or more protruding fixing protrusions 225 may be further formed.
[92]
In addition, the bonding plate 236A of FIG. 3 is compared with the configuration of the bonding plate 236 of FIG. 3, so that the fixing protrusion 225 of the module housing 220A is inserted into the stepped portion 239A. At least one internal fixing groove 239a may be formed.
[93]
Accordingly, according to this configuration of the present invention, the fixing protrusion 225 of the module housing 220A and the fixing groove 239a of the stepped portion 239A are coupled to each other, so that the bonding plate 236 is connected to the module housing. It can be guided to be positioned in the correct position on the inner surface of 220A, facilitating the installation process. In addition, the coupling structure of the fixing protrusion 225 and the fixing groove 239a may prevent the end frame 230 from being detached after being combined with the module housing 220A.
[94]
6 is a side view schematically showing a bonding plate, which is a part of a battery module according to another embodiment of the present invention.
[95]
Referring to FIG. 6 along with FIG. 2, the bonding plate 236A2 is formed from the main body 237 of the bonding plate 236A2 so that the stepped portion 239A2 presses the inner surface of the module housing 220. The inner surface of the module housing 220 may extend to be inclined in a direction.
[96]
For example, as shown in FIG. 6, the bonding plate 236A2 may be coupled to the upper wall (FIGS. 3 and 233) of the main frame (FIGS. 2 and 232 ), and the step portion 239A2 is It may extend from the main body 237 to be inclined upward at a predetermined angle (A). That is, when the bonding plate 236A2 is inserted so as to be in close contact with the inner surface of the module housing 220, the stepped portion 239A2 inclined upward presses the inner surface of the module housing 220 upward. can do.
[97]
Therefore, according to this configuration of the present invention, since the step portion 239A2 extending inclined from the main body portion 237 can be positioned to press the inner surface of the module housing 220, the step portion 239A2 is The module housing 220 may be more closely contacted with the inner surface of the module housing 220, and welding between the stepped portion 239A2 and the module housing 220 may be easier, thereby increasing welding reliability.
[98]
7 is a perspective view schematically showing an end frame that is a part of a battery module according to an embodiment of the present invention. And, FIG. 8 is a vertical cross-sectional view schematically showing a cross-sectional view of the battery module taken along line B-B' of FIG. 7.
[99]
7 and 8, the main frame 232 of the end frame 230 may be manufactured by a casting method. Here, the casting may be, for example, die casting, and such die casting may be said to be a method of manufacturing a casting by heating and melting a metal material and then injecting it into a mold having a desired shape. When manufacturing the body frame 232 by such casting, it is possible to precisely form a complex structure without additional finishing work.
[100]
In addition, the bonding plate 236 may be manufactured by insert injection molding into the body frame 232. Specifically, in the manufacturing method using the insert injection molding, the bonding plate 236 includes a bonding plate 236 in advance in a mold for casting the main frame 232, and the main frame 232 After injecting the molten material of the mold into the mold, the body portion 237 of the bonding plate 236 may be manufactured by solidifying so as to couple with the sidewall 233 of the body frame 232.
[101]
Moreover, the bonding plate 236 may be manufactured by pressing or extrusion molding. Therefore, when insert injection molding the bonding plate 236 together with the body frame 232, the temperature of the molten material of the body frame 232 is conducted to the outer surface of the bonding plate 236, the main body The material of the side wall 233 of the frame 232 and the material of the body portion 237 of the bonding plate 236 may be melt-bonded in a mixed form.
[102]
Therefore, according to this configuration of the present invention, it is possible to form a complex shape on the body frame 232 using a casting method, and the press or extrusion-molded bonding plate 236 is combined with the body frame 232 By forming so as to be, it is possible to effectively reduce defects generated in the welding process between the module housing 220 and the end frame 230, thereby improving weldability.
[103]
Moreover, at least one fixing hole 237a may be formed in the body portion 237 of the bonding plate 236. In addition, a part of the sidewall 233 of the main frame 232 may be embedded in the fixing hole 237a. That is, the fixing hole 237a of the bonding plate 236 may be formed so that the main body 237 of the bonding plate 236 and the sidewall 233 of the main frame 232 are coupled to each other.
[104]
Further, when the main frame 232 inserts the bonding plate 236 through a casting method, the molten material of the main frame 232 is placed inside the fixing hole 237a of the bonding plate 236. Can be cured after being embedded.
[105]
For example, as shown in FIG. 7, five fixing holes 237a may be formed in the body portion 237 of the bonding plate 236, and the body frame 232 may be formed in the fixing hole 237a. A portion of the sidewall 233 of) may be embedded to form a coupling structure with the bonding plate 236.
[106]
Therefore, according to this configuration of the present invention, by manufacturing the body frame 232 by a casting method without using a separate fastening member, the bonding plate 236 and the body frame 232 can have a strong binding force. have. Accordingly, not only can the number of parts be reduced to reduce the manufacturing cost, but also the fastening operation can be omitted, thereby reducing the manufacturing time and forming a stable coupling structure.
[107]
9 is a perspective view schematically showing an end frame for a battery module according to another embodiment of the present invention. And, FIG. 10 is a vertical cross-sectional view schematically showing a cross-sectional view of the battery module cut along the line C-C' of FIG. 9.
[108]
9 and 10, in the body portion 237B of the bonding plate 236B, an indentation portion 235 is formed in which a portion of the outer surface is inserted in the inner direction and the indented portion extends from one end to the other end. Can be. That is, the indentation portion 235 may be a portion formed with a thin thickness on a portion of the body portion 237B of the bonding plate 236B.
[109]
In addition, a part of the sidewall 233 of the body frame 232B may be embedded in the indentation portion 235 to form a buried fixing portion 234B. That is, when insert injection molding the bonding plate 236B with the body frame 232B, a part of the body frame 232B may be embedded in the indentation 235.
[110]
Moreover, the indentation portion 235 extends from one end to the other end of the body portion 237B, so that the embedding fixing portion 234B extends from one end to the other end of the body portion 237B of the bonding plate 236B. It may be formed in a structure connected to the sidewall 233 of the main frame 232B.
[111]
Specifically, the indentation portion 235 may be formed on the side end portion 238 of the body portion 237B not in contact with the stepped portion 239B. More specifically, the indentation portion 235 may be formed on the side end portion 238 of the body portion 237B of the bonding plate 236B in a direction opposite to the direction in which the step portion 239B is located.
[112]
Alternatively, although not shown in FIG. 9, when the indentation portion 235 is formed on the left and right side end portions 238c and 238d in the left and right directions of the body portion 237B of the bonding plate 236B , The buried fixing part 234B may extend from the side wall 233 of the main frame 232B and formed on the left side end 238c and the right side end 238d of the bonding plate 236B.
[113]
For example, as shown in FIG. 10, the indentation portion 235 is a side facing the front of the body portion 237B of the bonding plate 236B in a direction opposite to the direction in which the stepped portion 239B is located. It may be formed at the end 238. In addition, the embedded fixing portion 234B may be formed on a side end portion 238 extending from the side wall 233 of the body frame 232B and facing the front side of the body portion 237B of the bonding plate 236B. have.
[114]
Therefore, according to this configuration of the present invention, as the embedded fixing part 234B is formed integrally with the main frame 232B, when the bonding plate 236B is inserted into the module housing 220, the By pressing the stepped portion 239B in the center direction of the end frame 230, it is possible to effectively prevent the bonding plate 236B from being separated from the main frame 232B.
[115]
11 is a perspective view schematically showing an end frame for a battery module according to another embodiment of the present invention. And, FIG. 12 is a vertical cross-sectional view schematically showing a cross-sectional view of the battery module cut along the line D-D' of FIG. 11.
[116]
11 and 12, the indentation portion 235C may have a shape extending from the center of the outer surface of the body portion 237C of the bonding plate 236C to the left end portion 238c and the right end portion 238d. . Accordingly, the embedded fixing part 234C extends from the center of the bonding plate 236C to the left end 238c and the right end 238d, and is connected to the side wall 233 of the main frame 232C. Can be formed as
[117]
For example, as shown in FIG. 12, the indentation portion 235C is a left end portion 238c and a right end portion 238d in the left and right directions from the center of the outer surface of the body portion 237C of the bonding plate 236C. ) Can be formed to extend. In addition, the embedded fixing part 234C extends from the center of the bonding plate 236C to the left end 238c and the right end 238d in the left and right directions, and the side wall 233 of the main frame 232C and It can be formed in a connected shape.
[118]
Accordingly, according to this configuration of the present invention, compared to the embedded fixing portion 234C of FIG. 9, the embedded fixing portion 234C formed in the center of the body portion 237C of the bonding plate 236C is It is possible to more stably prevent the plate 236C from being separated from the side wall 233 of the main frame 232C.
[119]
13 is a perspective view schematically showing some configurations of a battery module according to another embodiment of the present invention.
[120]
Referring to FIG. 13, a plurality of slits 227 may be formed at front and rear ends of the module housing 220B welded to the stepped portion 239 of the bonding plate 236. The slit 227 may extend in the front-rear direction or may be formed to extend along a front end or a rear end of the side wall 233 of the module housing 220B. For example, as shown in FIG. 13, a plurality of slits 227 extending in the front-rear direction may be formed at front ends of the four side walls 233 of the module housing 220B.
[121]
Therefore, according to this configuration of the present invention, the slit 227 is heat from the bonding plate 236 during a welding process between the stepped portion 239 of the bonding plate 236 and the module housing 220B. Since it can be effectively transmitted to the stepped portion 239, it is possible to effectively shorten the time of the welding process and increase the bonding reliability.
[122]
14 is a perspective view schematically showing some components of a battery module according to another embodiment of the present invention.
[123]
Referring to FIG. 14, welding guide lines 229 may be formed at front and rear ends of the module housing 220C welded to the stepped portion 239 of the bonding plate 236. Here, the welding guide line 229 may have a shape in which a portion having a thickness thinner than that of the rest of the front and rear ends of the module housing 220C is linearly and continuously extended. In addition, the welding guide line 229 may be formed to extend along a front end or a rear end of the side wall 233 of the module housing 220C.
[124]
For example, as shown in FIG. 14, welding guide lines 229 may be formed on each of the four side walls 233 of the module housing 220C. In this case, the welding guide line 229 may be formed to extend along the front end of the side wall 233 of the module housing 220C.
[125]
Therefore, according to this configuration of the present invention, the welding guide line 229 not only can help the welding process of the operator, but also a part of the module housing 220C having a relatively thin thickness is faster than the bonding plate ( Since it can be welded to the stepped portion 239 of the 236, it is possible to effectively shorten the time of the manufacturing process.
[126]
In addition, the battery pack according to the present invention may include at least one battery module 200 according to the present invention. Moreover, the battery pack according to the present invention, in addition to the battery module 200, includes a pack case for accommodating the battery module 200, various devices for controlling charge and discharge of the battery module 200, such as BMS, current A sensor, a fuse, etc. may be further included.
[127]
And, the battery pack according to the present invention can be applied to a vehicle such as an electric vehicle or a hybrid vehicle. That is, the vehicle according to the present invention may include the battery pack according to the present invention.
[128]
Meanwhile, in the present specification, terms indicating directions such as up, down, left, right, before, and after are used, but these terms are only for convenience of description and vary depending on the location of the object or the observer. It is obvious to those skilled in the art of the present invention.
[129]
[130]
As described above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent range of the claims to be described.
[131]
[Explanation of code]
[132]
200: battery module 230: end frame
[133]
100: cell assembly 232: body frame
[134]
110: secondary battery 234: embedded fixing portion
[135]
111: electrode lead 236: bonding plate
[136]
220: module housing 237: main body
[137]
225: fixing protrusion 239: step
[138]
237a: fixed hole
Industrial availability
[139]
The present invention relates to a battery module having an end frame. In addition, it can be used in a battery pack including a plurality of battery modules and electrical components of the present invention, an electronic device including the battery pack, an energy storage system, or an automobile-related industry.
Claims
[Claim 1]
A cell assembly including a plurality of secondary batteries; A module housing having one or more side walls and configured to accommodate the cell assembly in an inner space defined by the side walls; And a main wall and a body frame having at least one side wall extending from an outer circumference of the main wall in a direction in which the module housing is located, and one side is coupled and fixed to the side wall of the main frame, and the other side is the front end or Battery module comprising an end frame having a bonding plate configured to be coupled to the rear end.
[Claim 2]
The method of claim 1, wherein the bonding plate includes a body portion coupled to a side wall of the body frame, and a step portion extending from the side end portion of the body portion so as to have a step difference with the body portion and in close contact with the inner surface of the module housing. Battery module, characterized in that.
[Claim 3]
The method of claim 2, wherein at least one fixing protrusion protruding in a direction in which the stepped part is located is formed on an inner surface of the module housing facing the stepped part, and a fixing protrusion of the module housing is inserted into the stepped part. Battery module, characterized in that at least one fixing groove is formed so as to be internal.
[Claim 4]
The battery module according to claim 2, wherein the stepped portion extends from the main body of the bonding plate to be inclined in a direction in which the inner surface of the module housing is located to press the inner surface of the module housing.
[Claim 5]
The battery module of claim 2, wherein at least one fixing hole is formed in the main body of the bonding plate so that a part of the sidewall of the main frame is embedded.
[Claim 6]
According to claim 2, In the body portion of the bonding plate, a portion of the outer surface is indented in the inward direction and the indented portion is formed to extend from one end to the other end, and a part of the side wall of the body frame is the indented portion. Battery module, characterized in that the embedded fixing portion is formed by being embedded in.
[Claim 7]
The battery module of claim 6, wherein the indentation is formed at a side end of the main body that is not in contact with the stepped portion.
[Claim 8]
The battery module of claim 6, wherein the indentations extend from the center of the main body of the bonding plate to both ends.
[Claim 9]
A battery pack comprising at least one battery module according to any one of claims 1 to 8.
[Claim 10]
A vehicle comprising the battery pack according to claim 9.