Patent Publication Number: US-2022238905-A1

Title: Secondary battery cell module and assembling method thereof

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a divisional of U.S. patent application Ser. No. 16/617,259, filed Nov. 26, 2019, which is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/KR2018/012275, filed Oct. 17, 2018, published in Korean, which claims priority to Korean Patent Application No. 10-2017-0148727 filed on Nov. 9, 2017 in the Republic of Korea, the disclosures of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a secondary battery cell module and an assembling method thereof. 
     BACKGROUND ART 
     The use of a secondary battery which may be semi-permanently used by recharging it is being gradually extended to power sources of vehicles as well as a power supply of a portable electronic device. In the case of the portable electronic device, a secondary battery made of a single cell is used, and in the case of the secondary battery used as a power source of vehicles, a battery pack in which a plurality of battery cells are mounted in a module to realize high capacity, and a plurality of modules are disposed according to a predetermined arrangement, is configured. 
     Depending on shapes of battery cells, there are various methods for mounting a plurality of battery cells in a single module, and in the case of a bar-type battery cell such as with a cylindrical shape, a bar-type battery cell is disposed between an upper frame and a lower frame, and the upper frame and the lower frame are fixed by fastening the same. In this case, the assembling of upper/lower frames and a battery cell is performed in order of arranging battery cells on a lower frame, putting an upper frame on them, and fastening the upper/lower frames. However, a plurality of cells must be simultaneously assembled, so assembling defects may be generated by assembling tolerance of respective cells, and to compensate for this, an additional process such as a process for fixing cells on the lower frame by use of an adhesive is performed, thereby increasing time and cost of the assembling process. 
     DISCLOSURE 
     Technical Solution 
     The present invention has been made in an effort to provide a method for assembling a secondary battery cell module for assembling a plurality of battery cells and upper/lower frames without using an additional process such as fixation of cells using an adhesive, and a secondary battery cell module assembled by the method. 
     An exemplary embodiment of the present invention provides a method for assembling a secondary battery cell module by using an assembling jig including a plurality of guide rods disposed on a jig plate, including: mounting a lower frame on the jig plate while the guide rods are inserted into a plurality of arranging through-holes of the lower frame; disposing a plurality of battery cells on the lower frame; mounting an upper frame on the battery cells while the guide rods are inserted into a plurality of arranging through-holes of the upper frame; fastening the upper frame and the lower frame; and separating the assembling jig from the upper frame and the lower frame. The method for assembling a secondary battery cell module may further include mounting a bottom plate on the jig plate while the guide rods are inserted into a plurality of holes in the bottom plate before the mounting of the lower frame on the jig plate, and the separating of the assembling jig from the upper frame and the lower frame may be performed by separating the bottom plate from the jig plate. 
     An arranging through-hole of the lower frame and an arranging through-hole of the upper frame may be disposed at mutually corresponding positions, respective numbers of arranging through-holes of the lower frame and arranging through-holes of the upper frame may be greater than a number of the guide rods of the assembling jig, and the battery cell has a cylindrical shape. 
     Another embodiment of the present invention provides a secondary battery cell module including: a lower frame including a plurality of triangular columns, a plurality of connectors for connecting three adjacent triangular columns, and a support protruding from the connectors; an upper frame including a plurality of triangular columns, a plurality of connectors for connecting three adjacent triangular columns, and a support protruding from the connectors; and a plurality of battery cells interposed between the lower frame and the upper frame, wherein arranging through-holes may be formed in at least two of a plurality of connectors of the lower frame and at least two of a plurality of connectors of the upper frame, and an arranging through-hole of the lower frame and the arranging through-hole of the upper frame may be disposed at mutually corresponding positions. 
     A plurality of respective connectors of the lower frame and a plurality of respective connectors of the upper frame may have an arranging through-hole. 
     Three auxiliary walls respectively connected to an edge of the triangular column may be further formed on a plurality of connectors of the lower frame and a plurality of connectors of the upper frame, the arranging through-hole is disposed at a center portion in which the auxiliary wall of the connector may not be provided, respective triangular columns of the lower frame and the upper frame may include three circular arc-shaped wall sides and a rectangular straight side for connecting therebetween, and the battery cell may have a cylindrical shape. 
     A secondary battery pack is configured by receiving a secondary battery cell module according to an exemplary embodiment of the present invention in a lower case and covering the same with an upper case. 
     Another embodiment of the present invention provides a jig for assembling a secondary battery cell module, including: a jig plate; and a plurality of guide rods disposed at predetermined intervals on the jig plate. 
     Advantageous Effects 
     When the method for assembling a secondary battery cell module according to an exemplary embodiment of the present invention is used, the battery cell modules may be accurately arranged on the lower frame, and the upper frame may be accurately disposed on the arranged battery cell modules to thereby prevent assembling defects. 
     Further, the process for assembling a secondary battery cell module may be simplified by omitting the additional process such as fixation of cells using an adhesive, and the assembling time and cost may be reduced. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a perspective view of a secondary battery cell module according to an exemplary embodiment of the present invention. 
         FIG. 2  shows a perspective view of an enlarged portion of an upper frame or a lower frame of a secondary battery cell module according to an exemplary embodiment of the present invention. 
         FIG. 3  shows a top plan view of an enlarged portion of an upper frame or a lower frame of a secondary battery cell module according to an exemplary embodiment of the present invention. 
         FIG. 4  shows a perspective view of an assembling jig used in a method for assembling a secondary battery cell module according to an exemplary embodiment of the present invention. 
         FIG. 5  to  FIG. 9  show perspective views for sequentially showing a process for assembling a secondary battery cell module according to an exemplary embodiment of the present invention. 
         FIG. 10  shows an exploded perspective view of a process for receiving a secondary battery cell module in an upper/lower case and manufacturing a secondary battery pack according to an exemplary embodiment of the present invention. 
         FIG. 11  shows a perspective view of a secondary battery pack manufactured by receiving a secondary battery cell module in an upper/lower case according to an exemplary embodiment of the present invention. 
     
    
    
     MODE FOR INVENTION 
     The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. 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. 
     In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like reference numerals designate like elements throughout the specification. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. 
       FIG. 1  shows a perspective view of a secondary battery cell module according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 1 , the secondary battery cell module  100  according to an exemplary embodiment of the present invention includes a lower frame  110 , an upper frame  120 , and a plurality of battery cells  130  interposed therebetween. The battery cell  130  is formed to have a long bar shape, and the present exemplary embodiment exemplifies a cylindrical battery cell  130 . Positive and negative access terminals  121  and  122  are installed in the upper frame  120 , and a plurality of upper fasteners  123  are formed thereon. A lower fastener  113  for combination with the upper fastener  123  is formed on the lower frame  110 . The lower fastener  113  and the upper fastener  123  fasten the lower frame  110  and the upper frame  120  to fix the same through female and male combination. 
     A configuration of the upper and lower frames  110  and  120  of the secondary battery cell module  100  according to an exemplary embodiment of the present invention will now be described with reference to  FIG. 2  and  FIG. 3 . 
       FIG. 2  shows a perspective view of an enlarged portion of an upper frame or a lower frame of a secondary battery cell module according to an exemplary embodiment of the present invention, and  FIG. 3  shows a top plan view of an enlarged portion of an upper frame or a lower frame of a secondary battery cell module according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 2  and  FIG. 3 , the upper frame  120  or the lower frame  110  of the secondary battery cell module includes a cell region  17  for receiving a cylindrical battery cell  130 . The cell region  17  is formed by a plurality of triangular columns  11  formed near the same, a connector  14  for connecting three adjacent triangular columns  11 , a plurality of auxiliary walls  12  formed on the connector  14  and connected to one edge of the triangular column  11 , and a support  13  protruding toward the cell region  17  from the connector  14 . Each the cell region  17  is surrounded by three triangular columns  11  and three connectors  14  connecting them, and three supports  13  protruding from the three connectors  14  prevent the battery cell  130  from leaving the cell region  17 . A wall side corresponding to three sides of the triangular column  11  has a circular arc-shaped curve, and a portion corresponding to an apex is a rectangular straight side. Three auxiliary walls  12  are disposed on each connector  14 , a portion in which no auxiliary wall  12  is provided is provided on a center of the connector  14 , and an arranging through-hole  19  is formed on the portion. The arranging through-hole  19  represents a hole for allowing a guide rod to pass therethrough, wherein the guide rod is used to accurately arrange the upper and lower frames  110  and  120  and a plurality of battery cells  130  during a process for arranging the battery cells  130  on the lower frame  110  and putting the upper frame  120  thereon to assemble the same. 
       FIG. 2  and  FIG. 3  exemplify a case in which the arranging through-hole  19  is formed in each connector  14 , and the same may be formed in only some of the connectors  14 . The arranging through-holes  19  may be uniformly distributed on the whole upper and lower frames  110  and  120  according to a predetermined rule, and when the arranging through-hole  19  is formed at a predetermined position of the lower frame  110 , an arranging through-hole  19  is also formed at a corresponding position at the upper frame  120 . That is, the disposing positions of the arranging through-holes  19  are the same on the upper frame  120  and the lower frame  110 . 
     A method for assembling a secondary battery cell module according to an exemplary embodiment of the present invention will now be described with reference to  FIG. 4  to  FIG. 9 . 
       FIG. 4  shows a perspective view of an assembling jig used in a method for assembling a secondary battery cell module according to an exemplary embodiment of the present invention, and  FIG. 5  to  FIG. 9  show perspective views for sequentially showing a process for assembling a secondary battery cell module according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 4 , the assembling jig  10  is configured with a jig plate  1  and a plurality of guide rods  2  disposed thereon at predetermined intervals. 
     As shown in  FIG. 5 , a bottom plate  3  is provided on the jig plate  1  of the assembling jig  10 . A plurality of holes (not shown) corresponding to the respective guide rods  2  are formed in the bottom plate  3 , so the bottom plate  3  is provided on the jig plate  1  as the guide rod  2  passes through the same. The number of holes formed in the bottom plate  3  may be equal to or greater than the number of guide rods  2 . The bottom plate  3  may be formed with an elastic material such as a rubber so that it may function to absorb an impact between the assembling jig  10  and the lower frame  110 . 
     As shown in  FIG. 6 , the lower frame  110  is disposed on the bottom plate  3 . In this instance, the guide rod  2  passes through the arranging through-hole  19  of the lower frame  110  described with reference to  FIG. 2  and  FIG. 3  to protrude upward, and the lower frame  110  is provided on the bottom plate  3 . In this instance, the number of arranging through-holes  19  may be equal to or greater than the number of guide rods  2 . 
     As shown in  FIG. 7 , a plurality of battery cells  130  are disposed on the lower frame  110 . The battery cell  130  is received in the cell region  17  of the lower frame  110  described with reference to  FIG. 2  and  FIG. 3 , and its downward movement is limited by the support  13  described with reference to  FIG. 2  and  FIG. 3 . In this instance, the guide rod  2  protrudes over the battery cell  130  passing through a space between the battery cells  130 . 
     As shown in  FIG. 8 , the upper frame  120  is mounted on a plurality of battery cells  130 , and the upper fastener  123  and the lower fastener  113  described with reference to  FIG. 1  are combined to each other to thus fix the upper frame  120  and the lower frame  110 . In this instance, the guide rod  2  passes through the arranging through-hole  19  of the upper frame  120  and protrudes upward, one battery cell  130  is received in the cell region  17  of the upper frame  120 , and the movement in the upward direction by the battery cell  130  is limited by the support  13 . The number of arranging through-holes  19  may be equal to or greater than the number of guide rods  2 . 
     As shown in  FIG. 9 , the assembling jig  10  is separated by lifting the bottom plate  3  together with the assembled secondary battery cell module  100 . 
     When the bottom plate  3  is separated, the secondary battery cell module as shown in  FIG. 1  is obtained. 
     The secondary battery pack is manufactured by receiving the assembled secondary battery cell module in the upper/lower cases. 
       FIG. 10  shows an exploded perspective view of a process for receiving a secondary battery cell module in an upper/lower case and manufacturing a secondary battery pack according to an exemplary embodiment of the present invention, and  FIG. 11  shows a perspective view of a secondary battery pack manufactured by receiving a secondary battery cell module in an upper/lower case according to an exemplary embodiment of the present invention. 
     The secondary battery pack shown in  FIG. 10  is manufactured, as shown in  FIG. 11 , by receiving the assembled secondary battery cell module  100  in a lower case  300  and covering the same with an upper case  200 . In this instance, the two access terminals  121  and  122  may be exposed through an opening of the upper case. 
     When the secondary battery cell module is assembled according to the above-described method, the battery cell modules may be accurately arranged on the lower frame, and the upper frame may be accurately disposed on the arranged battery cell modules thereby preventing assembling defects. Further, by omitting additional process such as fixation of cells by use of an adhesive, the process for assembling a secondary battery cell module is simplified, thereby reducing the assembling time and cost. 
     While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.