The present invention relates to a manufacturing technique of a battery module, the present invention relates to a strap for battery modules, battery modules, and the strap pressing jig comprising the same.
[2]
This application claims priority to an application for the Korea Patent Application No. 10-2016-0113289, filed as September 2, 2016, and all information disclosed in the specification and drawings of that application is hereby incorporated by reference into this application.
BACKGROUND
[3]
Recently secondary batteries are being applied universally to electric vehicle (EV, Electric Vehicle) or a hybrid vehicle (HEV, Hybrid Electric Vehicle), which is driven by the electrical drive source, as well as portable devices.
[4]
Type of secondary battery is now widely used, there are lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries. Operating voltage of this unit secondary battery cell is about 2.5V ~ 4.2V. Thus, more than if the required high output voltage by connecting a plurality of secondary battery cells in series and also constitute the battery module. In addition, the parallel connection of a plurality of secondary battery cells according to the charge and discharge capacity required for the battery modules may constitute the battery module.
[5]
In many cases to configure the battery pack to connect the secondary battery cells in series / parallel, by a plurality of secondary battery cells stacked configuration the cell assembly first, to fix the outer shape of the cell assembly, to protect the cell assembly from an external impact It is a way to constitute the battery module typically by adding an end plate which serves.
[6]
On the other hand, in general, a plurality of secondary battery cells are lithium-polymer may be a pouch-type secondary battery. Lithium-polymer for a pouch type secondary battery, the electrolyte inside the side reaction of repeated charge and discharge is decomposed may cause gas. In this case, a phenomenon in which the deformation contours of the secondary battery cell by the gas generated is called a "swelling phenomenon."
[7]
In the event of a swelling phenomenon in a secondary battery cell including a cell assembly, due to the force on the outside it can vary the appearance of the battery module. Change of appearance should prevent this happening, swelling phenomena may affect the safety and stability of the adjacent other devices in the battery module itself.
[8]
One of these swelling phenomenon prevention technology, a technique of pressing a certain force the battery module around the steel straps on the end plate.
[9]
Of Figure 1 (a) and (b) are views showing the prior overview of the strap for the battery module. First, FIG strap, such as the 1 (a) may be the following, both ends of the battery module navigation binary welding. To be fully exert the functions of strap must be fastened while the outer surface of the battery module to the strap tight before welding. However, the strap of Figure 1 (a) is easily the tightness of the strap loosened only by the welding force of the strap during the welding process in progress it is difficult to ensure the reliability of the pressing force in the battery module.
[10]
And no strap is required, such as welding of 1 (b), but a low manufacturing cost advantages by the simple structure, the limiting diameter then there is a difficult problem that the assembly of the battery module. Accordingly, the development of a new strap is required that, while taking advantage of the conventional straps economics, can secure a sufficient granulation property and binding.
Detailed Description of the Invention
SUMMARY
[11]
Accordingly, the present invention is a such, object of the present invention to provide a battery module including the strap, and this, for a new type of battery modules can be sufficiently secured compared to existing mounting ease and binding designed to solve the above problems.
[12]
It may be understood by the following description of Other objects and advantages of the present invention will be appreciated more clearly by the embodiment of the present invention. Also, the objects and advantages of the invention will be readily appreciated that this can be realized by the means as claimed and combinations thereof.
Problem solving means
[13]
Strap according to one aspect of the invention, having a larger than the outer peripheral closed loop structure of the battery module, provided with at least a portion of the folded shape in the closed loop, when the predetermined pressure is applied consisting be that the folded portions overlap each other, the weld It may have a.
[14]
A bottom surface of the battery module, comprising a left side, a right side and a first strap section provided to surround the upper surface of each of the second strap section, the third strap segment and a fourth strap section, the weld surrounding the top surface of the battery module and the fourth may be formed in the strap section.
[15]
The fourth straps interval, and the extended horizontally to the ground on the basis of the horizontal weld zone, an inclined section extending obliquely relative to the ground may be further provided.
[16]
The second strap section is, forms an obtuse angle with respect to said first strap section can be connected and the slope region.
[17]
The weld, may be folded in a zigzag form.
[18]
According to another aspect of the invention, there is provided a jig for the strap pressing for pressing the following, the strap covered with the above-mentioned strap to the battery module to the battery module, the receiving module for forming a space for the battery module is partially interference fit with space; And forming an upper wall of the module housing space, when the battery module to be inserted into the receiving space inside the module, a strap for pressing jig including a pressure plate for pressing the folded portion of the strap may be provided.
[19]
The strap is pressing jig, and forming the bottom wall of the module housing space, the base plate for supporting the battery module; And it may further include an insertion limiting plate forming the one side wall of the module housing space by connecting the one side edge portion of the pressure plate and the base plate up and down.
[20]
The pressure plate may, be shorter than the extended position of the welded portion of the strap when the side surface of the battery module is brought into contact with the insertion limiting plate.
[21]
The pressure plate may be a binary shape tapered end.
[22]
The pressure plate is, the height of the module, the receiving space may be provided so as to be elevating adjustable.
[23]
It is provided at an upper portion of the pressure plate, and extends to the top plate and screwed into the rod and the rod to the screw hole of the upper plate having a screw hole formed penetrating up and down the height provided with a connection portion connected to the pressure plate in the lower portion of the upper plate It may further include an adjusting member.
[24]
According to still another aspect of the invention, a cell assembly having a plurality of battery cells, a frame for a cell stack; An end plate covering said cell assembly; And it can be provided with a battery module including the above-described strap adapted to surround the end plate.
[25]
The strap may be mounted two or more at certain intervals along the one side direction of the end plate.
Effects of the Invention
[26]
According to an aspect of the invention, the existing contrast and ease of mounting straps for battery module that is capable of securing sufficient binding can be provided. In addition, it is possible to prevent the appearance change of the module battery due to the swelling phenomenon.
[27]
According to another aspect of the invention, a jig for pressing the strap to enable the strap pressing and welding process at a time it can be provided. Accordingly, the reliability can be improved and the convenience of the strap pressing and welding process.
Brief Description of the Drawings
[28]
Intended to illustrate the following figures attached to the specification are exemplary of the invention, the components which serve to further understand the spirit of the invention and together with the description of which will be described later invention, the details of this invention is described in such figures be construed as limited only is not.
[29]
(A) and (b) of Figure 1 are views schematically showing the strap according to the prior art.
[30]
Figure 2 is a schematic perspective view of a battery module according to an embodiment of the present invention.
[31]
Figure 3 is a perspective view of the strap according to one embodiment of the present invention.
[32]
4 is a cross-sectional view of Fig.
[33]
Figure 5 is a schematic perspective view of a jig for pressing the strap according to one embodiment of the present invention.
[34]
6 is a perspective view showing a state of the battery module partially inserted into a jig for pressing the strap of FIG.
[35]
Figure 7 (a) and 7 (b) are diagrams for showing the strap pressing method using a pressing jig for the strap of FIG.
[36]
Figure 8 is a schematic perspective view of a jig for pressing the strap according to another embodiment of the present invention.
[37]
9 is a view showing a state in which the strap is pressed against a jig for pressing the strap of Fig.
Mode for the Invention
[38]
With reference to the accompanying drawings will be described a preferred embodiment of the present invention; Prior to this, the specification and are should not be interpreted words general and as limited to the dictionary meanings used in the claims, the inventor can adequately define terms to describe his own invention in the best way be based on the principle that the interpreted based on the meanings and concepts corresponding to technical aspects of the present invention.
[39]
Further, when it is determined that a detailed description of known functions and configurations in the following description of the present invention may obscure the subject matter of the present invention, the detailed description thereof will be omitted.
[40]
On the other hand, the term indicates the direction, such as up, down, left, and right, sides in the description and claims of the present invention keeps stated as relative terms to describe the direction of, as shown in the figure, that the viewing direction can be reversed according to the direction . In addition, the shape and size of configuration elements in the figures may be exaggerated, omitted or shown in, for convenience of understanding or schematic. Thus, the size and ratios of each component does not utterly reflect an actual size or scale.
[41]
Figure 2 is a schematic perspective view that sloth the battery module according to an embodiment of the invention.
[42]
2, may include a battery module 10, cell assembly (not shown), the sensing assembly 200, end plate 100, the straps 300 according to one embodiment of the present invention.
[43]
Cell assembly may be an assembly of a secondary battery formed of a plurality of secondary battery cells. The kind of the secondary battery cell is not particularly limited. Each of the secondary battery cell may be configured as a lithium ion battery, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, charge and discharge.
[44]
The cell assembly may further include a stacking frame for the for a stack of secondary cells. The frame for laminating may be a means for stacking the secondary battery, by holding the rechargeable battery prevents the flow configuration and which serves to guide the assembly of the secondary battery. Stacking frame for may be replaced by other terms such as cartridge (cartridge).
[45]
Sensing assembly 200 serves to transmit the sensing information for the electrical characteristics, such as voltage of the secondary battery cell to another device outside the battery module (10). For example, the battery module 10, the device is connected, such as (Battery Management System) BMS, may be configured to control the operation of charging or discharging, battery module 10. At this time, the sensing assembly 200 is connected to the BMS, may provide information such as the voltage of the secondary battery cells to BMS, BMS may control the battery module 10 on the basis of this information.
[46]
Sensing assembly 200 may be mounted on one side or both sides of the cell assembly to be coupled to the electrode leads of the secondary battery and the electric cell.
[47]
In this embodiment the battery module 10, since the positive electrode lead and negative electrode lead composed of a pouch type secondary battery cells extend in both directions, as shown in Figure 2, the sensing assembly 200 is one for mounting on either side of the cell assembly presented is composed.
[48]
End plate 100 may be composed of a base plate 110, a base plate 110 and welded to bolt the cover plate 120 for coupling is fastened which is located on the lower face of the cell assembly. The cover plate 120 may be manufactured to be made of a substantially lid-shaped "c" shape covering the upper surface and both sides of the cell assembly. Of course, it is not the scope of the present invention limited to the end plate 100 as in the embodiment. Unlike this embodiment, the end plate may be manufactured in a variety of ways, such as assembly or integrally formed with four plates.
[49]
The end plate 100, provides a mechanical force to the cell assembly, and serves to protect the cell assemblies in the battery module 10 from external impact and the like. The end plate 100 may be made of metal so as to be rigid secured. In particular, the end plates 100 may be made of steel (steel) material for rigid securing against the swelling of the secondary battery cell.
[50]
As shown in Figure 2, the outer surface of the battery module 10 can be configured to the end plate 100, end plate 100 has the strength can be reinforced surrounded by a strap (300) of the strip. Strap 300 serves to prevent deformation of the battery modules 10 of the outer surface of the battery module 10, i.e., cell swelling by pressing the end plate 100.
[51]
Figure 3 is a perspective view of the strap according to one embodiment of the invention, Figure 4 is a cross-sectional view of Fig.
[52]
Strap 300 according to one embodiment of the present invention may be a closed loop having a larger construction than the outside circumference of the battery module 10, in the closed loop at least a portion arranged in a folded form. Strap 300 is preferably to function as a strength reinforcing member can be made of metal such as steel (steel).
[53]
For example, the operator can be attached to the battery module 10, a strap 300 in a manner to put written along the longitudinal direction of the battery module 10 (X-axis direction in Fig. 2). In this case, the strap 300 has a slight elasticity, since the structure consists of a closed loop with a larger circumference than the circumference of the battery module 10, and the assembly of the battery module 10 can be facilitated. On the other hand, the end plate 100 may further include a groove for a strap (300) attached to the location where the strap 300 is mounted. The grooves may be formed in the concave than the other surface of the end plate 100. Therefore, when the strap 300 is located within the groove are right and left flow can be prevented.
[54]
As shown in Figure 3 to Figure 4, the strap 300 when the battery module 10, subject to mounting, the first strap section provided so as to respectively surround the left side, right side view and a top surface 310, a second strap section 320, a third strap section 330, and the fourth may include a strap section (340).
[55]
The battery module 10 in this embodiment has the outer shape may be provided in a substantially box shape, and the peripheral may be a rectangular shape. The first strap segment 310 is produced so as to have a length corresponding to the width of the base plate 110 corresponding to the lower surface of this battery module 10, the second and third strap section 330 includes a battery module (10 ) it can be made to have a length corresponding to the width of the left and right sides of the cover plate corresponding to the left side surface and right side surface of the. That is, the first to third strap section 330 has a width and a length of the corresponding end plate (100) portion can be designed to be almost the same.
[56]
Fourth strap section 340 has a welded portion 341 of the folded form more produced and at least a portion in a zigzag shape longer than the width of the upper surface of the battery module 10. Thus, the above in the drawings, a folded weld 341 down can be pressed later, and then welded. In addition, the fourth strap section 340 in FIG. 4, when located in the left relative to the welded portion 341, a horizontal parallel to the surface positioned on the right side of the welded portion 341, section 343 and the weld 342 light may further include a photo slope region 342 for. The second strap segment 320 is a first can forms an obtuse angle (θ1) for the strap section 310 is connected to the inclined section 342.
[57]
Thus by taking an expanded form outside a circumference of the second strap section 320 and fourth strap section 340, the battery module 10, some of the target mounted on, extends the strap 300 is elastically battery It can be facilitated icing on module 10.
[58]
A fourth horizontal section (343) has a third substantially right angles to the strap section 330, it takes the angled shape of the horizontal section 343 and the third strap section 330 of the strap section 340 has the strap 300 When the wooge and cover to the battery module 10, respectively may be in contact with the upper surface and right side surface of the battery module 10. In addition, the first strap section 310 can be in contact with the lower surface of the battery module 10.
[59]
On the other hand, the slope region 342 has a horizontal section 343 is compared to the slope (θ2) by the height (H) of the weld (341). This inclination may converge to claim 4 is applied the pressure in the slope region 342 on top of the strap section 340, a nearly "zero degree". For example, the main surface to the strap 300 presses the slope region 342 of the following, a fourth strap section 340 is covered on the battery module 10, the inclination (θ2) of the oblique section (342) to be substantially 0 degrees battery may be in contact with the upper surface of the module 10, second strap sections 230 can be so deformed integrally with the slope region 342, the angle θ1 results in lower contact with the left side surface of the battery module 10.
[60]
I.e. the strap 300 of the present invention has a feature in the shape of a constant pressing force is applied to the ground, the strap 300 after being written to the battery module 10 can be modified to fit the circumference of the battery module 10.
[61]
On the other hand, but the hand in the above-described strap 300 could also advance the crimp putting the battery module 10, and then, the welding process, the hand can decrease the efficiency of the compression process, and further performs the compression process and the welding process separately there can be a hassle to do.
[62]
Hereinafter, description will be made on a jig 20 for pressing the strap according to the invention, which allows to perform the strap 300, the crimping process and the welding process at a time.
[63]
5 is a schematic perspective view of a jig for pressing the strap according to one embodiment of the invention, Figure 6 is a perspective view showing a state in which the battery module partially inserted into a jig for pressing the strap of FIG.
[64]
Referring to these drawings, a jig 20 for the strap pressing of the present invention, can be of a pressure plate 21, base plate 22, the insertion limiting plate 23 and the module housing space (S) formed by these have.
[65]
Jig (20) for the strap pressing according to the present embodiment is configured to push the battery module 10 to the module housing space (S) through the portion that is open, it may be formed in a substantially "c" shaped can. The pressure plate 21, base plate 22 and the insertion limiting plate 23 may be a portion forming an upper wall, a lower wall and side walls of the module housing space (S), respectively.
[66]
Pressure plate 21 has a length that can be determined according to the length of the slope region 342 of substantially the strap 300. The For example, the battery module 10, this module containing space (S) when turned into completely pushed in, the pressure plate (21) end (21a) is the slope region 342 should be sufficient to press the But the strap 300 is subject to the welding of should not touch, the welding portion 341.
[67]
End (21a) of the pressure plate 21 may be provided in a tapered shape or a round shape in which the diameter decreases. By smooth contact of the end (21a) and the inclined section 342 of the pressure plate it is possible to prevent the strap 300 is damaged.
[68]
Receiving plate 22 can be formed relatively larger than the pressure plate 21. The base plate 22 may serve as a shelf for supporting the lower surface of the battery module 10 in its entirety.
[69]
Insert restriction plate 23 is to limit the insertion depth of the battery module 10. The height of the insertion limiting plate 23 may correspond to the height of the battery module 10.
[70]
In reference to Figures 7a-7b and the strap 300 using the jig 20 for pressing the strap according to the present embodiment it will be briefly described in the crimping process and the welding process.
[71]
First, prepare the battery module 10 covered with the strap 300 of the present invention described above and place it on the strap rest (22) of the pressing jig (20).
[72]
Then, it gives put slowly push the battery modules 10 in a module inside the housing space (S). Accordingly, there is a slope region 342 of the strap 300 can be pressed into the top surface the battery module 10 by the pressure plate (21). And finally the battery module 10, this module receiving space a second strap segment 310 and the slope region 342 when in the interference fit (S) are to be completely pressed into the battery module 10.
[73]
In this manner, when the strap 300 is fully pressed into the battery module 10, since the tightening force of the straps 300 as shown in an arrow direction in Fig. 7b to act, the battery module 10 is tight by straps 300 it can be tightened.
[74]
Next, welding the welding portion 341 of the strap 300 while the battery modules 10 are bound by the jig 20 for pressing the strap. Once this way the welding process is in progress, since the tightness of the strap 300 may be welded at the environment continue to be maintained can be secured enough biasing force of the strap 300 to the battery module 10 after welding. Further, the strap battery module 10, the pressing jig (20) since the bound, even without a separate jig for welding a battery module may perform the welding process in a stable manner.
[75]
Another embodiment of the present invention to be described hereinafter may be referred to as the configuration corresponding to FIG. 5 to FIG. 6 when compared with the above-described embodiments. The same reference numerals denote the same elements, and duplicate description of the same members will be omitted.
[76]
Figure 8 is a perspective view schematically illustrating a jig for pressing the strap according to another embodiment of the present invention, Figure 9 is a view showing a state in which the strap is pressed against a jig for pressing the strap of Fig.
[77]
This embodiment strap pressing jig (20), as shown in Figure 8, the upper plate 24 and the upper plate 24 provided with a screw hole provided at the top and bored through in the up-and-down direction of the pressure plate 21 a height adjustment member 25 mounted to the screw hole so as to be movable relative to the may further include. The leveling member 25 is extended from the rod (25b) and a rod (25b) being screwed to the handle and a screw hole in the lower portion of the upper plate 24 includes a connecting portion (25c) connected to the pressure plate 21 can do. With this configuration, the pressure plate 21 can be raised and lowered according to the rotation direction of the height adjustment member 25.
[78]
To the use of such strap pressing jig (20) will be described briefly.
[79]
First, prepare the battery module 10 covered with the strap 300. The Then, the battery mounted on the inside so module 10 is in close contact with the insertion limiting plate 23, the module housing space (S). At this time, it is desirable to release the handle height (25a) of the adjustment member 25 to sufficiently increase the pressure plate 21. The next, turning the welded portion 341 is a complete handle (25a) of the height adjustment member 25 until the overlap of the strap 300, the slope region 342, a pressure plate 21 on the upper surface of the battery module 10 thereby squeezed. Next, make sure that the battery modules 10 are tightly held between the pressure plate 21 and base plate 22 and the strap 300 is welded.
[80]
Such a module receiving according to the space jig 20 for the strap pressing according to the present embodiment with adjustable height (S), even if the size of the battery module 10 is different from the strap 300, compression of the battery module 10 and a welding operation may be possible.
[81]
[82]
Or more, although shown and described for the preferred embodiment of the invention, the invention is not limited to the preferred embodiment of the above-mentioned specific, in the art the art without departing from the subject matter of the present invention invention claimed in the claims those of ordinary skill, and not to can be readily applied to other types of embodiment, of course, that such changes are within the scope of the claims described.
[83]
On the other hand, in the present specification. In top, bottom, left, but using the term that indicates the direction, such as right, such terms are intended only for the convenience of description, may be expressed differently depending on the position that is put in position to view the observer and the target are those skilled in the art it is the self-evident.

WE Claims

In the strap to urge the outer surface of the battery module to prevent deformation of the battery module according to the battery cell swelling, has an outer circumference larger than a closed loop structure of the battery module, the at least the portion in the closed loop provided in a folded form , the strap comprising the be configured that the folded portions overlap each other when a predetermined pressure applied to the weld.
[Claim 2]
The method of claim 1, wherein the lower surface of the battery module, comprising a first strap section provided to surround the left side, right side and upper surfaces, respectively, a second strap section, the third strap segment and a fourth strap section, the weld is the strap, characterized in that the surrounding top surface of the battery module formed in the fourth strap section.
[Claim 3]
The method of claim 2, wherein the strap section 4 is that the strap and the horizontally extending to the ground on the basis of the horizontal weld zone, an inclined section extending obliquely relative to the ground, characterized by further comprising.
[Claim 4]
The method of claim 3, wherein the second strap section is, forms an obtuse angle with respect to said first strap section, characterized in that the strap is connected to the slope region.
[Claim 5]
The method of claim 1, wherein the weld, the strap, characterized in that the folded in a zigzag form.
[Claim 6]
Any one of claims 1 to in the following, the strap covered with straps to the battery module according to any one of claim 5, wherein the jig of the strap pressing for pressing the battery modules to form a space for the battery module is partially interference fit with module accommodating space; And a jig for pressing the strap, characterized in that to form an upper wall of the module housing space, wherein the battery module includes a pressure plate for pressing the folded portion of the strap when a pulling inside the module housing space.
[Claim 7]
The method of claim 6, wherein forming the bottom wall of the module housing space, the base plate for supporting the battery module; And a jig for pressing the strap further comprises a limiting plate inserted to form the one side wall of the module housing space by connecting the one side edge portion of the pressure plate and the base plate up and down.
[Claim 8]
The method of claim 7, wherein the pressure plate is a jig for pressing the strap such that a side surface of the battery module when it contacts with the insertion limiting plate, than the position of the short extension of the strap weld.
[Claim 9]
The method of claim 6, wherein the pressure plate is a jig for pressing the strap, characterized in that a taper-shaped end binary.
[Claim 10]
The method of claim 6, wherein the pressure plate is, jigs for pressing the strap, characterized in that the height of the module housing space designed to be elevating to be adjusted.
[Claim 11]
11. The method of claim 10, is provided at an upper portion of the pressure plate, it is extended to having a screw hole formed through a bottom baking sheet and, screwed to the rod and the rod to the screw hole of the upper plate to the pressure plate in the lower portion of the upper plate a jig for pressing the strap further comprises a height adjusting member having a connecting portion connected.
[Claim 12]
A plurality of cell assemblies including a battery cell, a frame for a cell stack; An end plate covering said cell assembly; And a battery module including a strap according to any one of claims 1 to 5 adapted to surround the end plate.
[Claim 13]
The method of claim 12, wherein the strap includes a battery module, characterized in that more than one is fitted at certain intervals along the one side direction of the end plate.