Title of Invention: Battery module, battery pack comprising such battery module and automobile comprising such battery pack
technical field
[One]
The present invention relates to a battery module, a battery pack comprising such a battery module and a vehicle comprising such a battery pack.
[2]
This application is an application for priority claiming Korean Patent Application No. 10-2018-0169947 filed on December 26, 2018, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
background
[3]
Secondary batteries that are easy to apply according to product groups and have electrical characteristics such as high energy density are not only portable devices, but also electric vehicles (EVs) or hybrid vehicles (HEVs) driven by an electric drive source. It is universally applied. These secondary batteries are attracting attention as a new energy source for improving eco-friendliness and energy efficiency in that not only the primary advantage of being able to dramatically reduce the use of fossil fuels but also the fact that no by-products are generated from the use of energy.
[4]
The types of secondary batteries currently widely used include a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydride battery, a nickel zinc battery, and the like. The unit secondary battery cell, that is, the operating voltage of the unit battery cell is about 2.5V ~ 4.5V. Accordingly, when a higher output voltage is required, a plurality of battery cells are connected in series to form a battery pack. In addition, a plurality of battery cells may be connected in parallel to form a battery pack according to the charge/discharge capacity required for the battery pack. Accordingly, the number of battery cells included in the battery pack may be variously set according to a required output voltage or charge/discharge capacity.
[5]
On the other hand, when configuring a battery pack by connecting a plurality of battery cells in series/parallel, a battery module including at least one battery cell is first configured, and other components are added using the at least one battery module. A method of configuring the battery pack is common.
[6]
In the case of a conventional battery module, electrode leads of battery cells and bus bars provided in a bus bar frame assembly are welded to each other for electrical connection during an assembly process. In this welding process, when a flow such as shaking of the bus bar frame assembly occurs, the accuracy and quality of welding may be deteriorated, and problems such as poor connection between the electrode leads and the bus bars may occur. .
[7]
Therefore, it is required to find a way to prevent the flow of the busbar frame assembly during the welding bonding process between the electrode leads of the battery cells and the busbars of the busbar frame assembly.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[8]
Accordingly, it is an object of the present invention to provide a battery module capable of preventing the flow of a busbar frame assembly during a welding bonding process between electrode leads of battery cells and busbars of a busbar frame assembly, and a battery including such a battery module It is intended to provide a pack and a vehicle comprising such a battery pack.
means of solving the problem
[9]
In order to solve the above object, the present invention, as a battery module, a plurality of battery cells; a bus bar frame assembly supporting the plurality of battery cells and having a plurality of bus bars electrically connected to electrode leads of the plurality of battery cells; and welding fixing pieces provided on upper and lower surfaces of the bus bar frame assembly for fixing the bus bar frame assembly during a welding process for electrically connecting the electrode leads of the plurality of battery cells and the plurality of bus bars It provides a battery module comprising a; a plurality of fixing jig holes into which they are inserted.
[10]
The plurality of fixing jig holes may include: base jig holes provided on a bottom surface of the bus bar frame assembly into which the welding fixing jigs are inserted during the welding process; and top jig holes provided on the upper surface of the bus bar frame assembly and into which the welding fixing jigs are inserted during the welding process.
[11]
The base jig holes may include edge jig holes formed in the bottom edge of the bus bar frame assembly; and auxiliary jig holes provided between the edge jig holes and spaced apart from each other by a predetermined distance along the width direction of the bus bar frame assembly.
[12]
The top jig holes may include edge jig holes formed at an edge of an upper surface of the bus bar frame assembly.
[13]
The bus bar frame assembly may include: a front frame and a rear frame including the plurality of bus bars; and a top frame connecting the front frame and the rear frame, wherein the plurality of fixing jig holes may be provided on upper and lower surfaces of the front frame and the rear frame.
[14]
The front frame and the rear frame may be rotatably hinged with respect to the top frame.
[15]
A plurality of interference preventing grooves may be formed in the top frame to prevent interference with the plurality of fixing jig holes when the front frame and the rear frame are hinged to the top frame.
[16]
The plurality of anti-interference grooves may be provided in four edge regions of the top frame.
[17]
And, the present invention provides a battery pack, comprising: at least one battery module according to the above-described embodiments; and a pack case for packaging the at least one battery module.
[18]
In addition, the present invention provides a vehicle comprising a; the battery pack according to the above-described embodiment as a vehicle.
Effects of the Invention
[19]
According to various embodiments as described above, a battery module capable of preventing the flow of a bus bar frame assembly during a welding bonding process between electrode leads of battery cells and bus bars of a bus bar frame assembly, including the battery module It is possible to provide a battery pack and a vehicle including such a battery pack.
Brief description of the drawing
[20]
The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention to be described later, so that the present invention is described in such drawings should not be construed as being limited only to
[21]
1 is a view for explaining a battery module according to an embodiment of the present invention.
[22]
FIG. 2 is a bottom perspective view of the battery module of FIG. 1 .
[23]
3 is a bottom view of the battery module of FIG. 2 .
[24]
FIG. 4 is a view for explaining a resin injection process of the battery module of FIG. 1 .
[25]
5 and 6 are views for explaining the state of the resin injection holes according to various embodiments of the battery module of FIG.
[26]
7 is a view showing a state in which the module case of the battery module of FIG. 1 is omitted.
[27]
8 is an exploded perspective view of the battery module of FIG. 7 .
[28]
9 is a bottom view of the battery module of FIG. 7 .
[29]
10 is a plan view of the battery module of FIG. 7 .
[30]
11 is a view for explaining a state of fixing the electrode lead of the battery module of FIG. 7 when welding.
[31]
12 is a view for explaining a battery pack according to an embodiment of the present invention.
[32]
13 is a view for explaining a vehicle according to an embodiment of the present invention.
Modes for carrying out the invention
[33]
The present invention will become more apparent by describing preferred embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the embodiments described herein are illustratively shown to aid understanding of the invention, and the present invention may be implemented with various modifications different from the embodiments described herein. In addition, in order to help the understanding of the invention, the accompanying drawings are not drawn to scale, but dimensions of some components may be exaggerated.
[34]
1 is a view for explaining a battery module according to an embodiment of the present invention, FIG. 2 is a bottom perspective view of the battery module of FIG. 1 , FIG. 3 is a bottom view of the battery module of FIG. 2 , and FIG. 1 is a view for explaining the resin injection process of the battery module, FIGS. 5 and 6 are views for explaining the state of the resin injection holes according to various embodiments of the battery module of FIG. 4 , FIG. 7 is FIG. 1 It is a view showing a state in which the module case of the battery module is omitted, FIG. 8 is an exploded perspective view of the battery module of FIG. 7 , FIG. It is a plan view, and FIG. 11 is a view for explaining a state of fixing the electrode lead of the battery module of FIG. 7 when welding.
[35]
1 to 11 , the battery module 10 includes a battery cell 100 , a module case 200 , a bus bar frame assembly 300 , a voltage sensing unit 400 , and a plurality of fixing jig holes 500 . ) may be included.
[36]
The battery cell 100 is a secondary battery, and may be provided as a pouch-type secondary battery. The pouch-type secondary battery may be composed of an electrode assembly, an electrolyte, and a pouch packaging material. The pouch case may be composed of two pouches, and a concave inner space may be formed in at least one of them. The electrode assembly and the electrolyte may be accommodated in the inner space of the pouch case. Sealing parts are provided on the outer peripheral surfaces of the two pouches and the sealing parts are fused to each other, so that the inner space in which the electrode assembly is accommodated can be sealed.
[37]
The battery cell 100 may be provided in plurality. The plurality of battery cells 100 may be stacked to be electrically connected to each other. Each of the plurality of battery cells 100 is a long cell having a relatively longer length than the width of the existing battery cells. For example, a long cell may have a length to width ratio of about 3 to 5 or more. In the battery module 10 according to the present invention, employing such a long-cell type battery cell 100 increases the capacity of the battery while maintaining the height of the battery module 10 low, thereby increasing the capacity of the battery module. is to be easily installed in a position such as under the seat or under the trunk of a vehicle. However, the scope of the present invention is not limited to these matters.
[38]
A pair of electrode leads 150 are provided in each of the plurality of battery cells 100 , and may respectively protrude in the front and rear directions of the battery module 10 .
[39]
The pair of electrode leads 150 are positioned while being biased toward one side from the center of the battery cell 100 in the width direction, and positioned while being biased downward along the height direction of the battery module 10 .
[40]
As such, the position of the pair of electrode leads 151 being deflected to one side from the center of the battery cell 100 in the width direction provides a space for the installation of a connector member 420, which will be described later, to the battery module ( 10) to improve the energy density.
[41]
The module case 200 accommodates the plurality of battery cells 100 , and may form an exterior of the battery module 10 . To this end, a space of a predetermined size for accommodating the battery cells 100 may be provided in the module case 200 .
[42]
The module case 200 is provided in a square tube shape. The space in the module case 200 is large enough to allow the battery cells 100 and the bus bar frame assembly 300 to be described later to be press-fitted. The module case 200 may help to reduce the weight and volume of the battery module.
[43]
At least one resin injection hole 210 into which the thermally conductive resin L can be injected is formed on one surface of the module case 200 . Here, one surface of the module case 200 may be a bottom surface corresponding to the bottom surface of the battery cells 100 .
[44]
Specifically, a plurality of the resin injection holes 210 are located between the central region and both edge regions in the longitudinal direction of the bottom surface of the module case 200 . In addition, checking holes 220 may be further formed in the central region and both edge regions. The checking holes 220 are for checking whether the resin L has permeated to the corresponding area. For example, when the resin L is confirmed in the checking hole 220 , the injection amount of the resin L can be adjusted by stopping the resin L injection.
[45]
On the other hand, the resin main holes 210 and the checking holes 220, as shown in FIG. 5, have a rectangular cross section, or, as shown in FIG. 6, shown in FIG. As described above, the resin L may have a trapezoidal cross-section so that it can be better introduced into the module case 200 .
[46]
The bus bar frame assembly 300 may be slidably inserted into the module case 200 and support the plurality of battery cells 100 .
[47]
The bus bar frame assembly 300 may include a front frame 310 , a rear frame 320 , a top frame 330 , and a plurality of bus bars 350 .
[48]
The front frame 310 and the rear frame 320 may include the plurality of bus bars 350 . The top frame 330 may connect the front frame and the rear frame.
[49]
Specifically, the front frame 310 , the rear frame 320 , and the top frame 330 may cover corresponding portions with sizes corresponding to the front, rear, and top portions of the battery cells 100 , respectively.
[50]
Here, the front frame 310 and the rear frame 320 are rotatably provided with respect to the top frame 230 . This is to facilitate assembly of the battery cells 100 and the bus bar frame assembly 300 .
[51]
To this end, the front frame 310 and the rear frame 320 may be rotatably hinged with respect to the top frame 330 . That is, the front frame 310 and the rear frame 320 may be hinge-coupled to one end and the other end of the top frame 330 , respectively.
[52]
Meanwhile, the top frame 330 may include an interference prevention groove 335 .
[53]
The interference prevention groove 335 may be provided in plurality. The plurality of anti-interference grooves 335 may be provided at four edge regions of the top frame 330 . The plurality of anti-interference grooves 335 include a plurality of fixing jig holes (to be described later) that may occur when hinged with the top frame 330 of the front frame 310 and the rear frame 320 . 500) can be prevented.
[54]
The plurality of bus bars 350 are provided on the front frame 310 and the rear frame 320 , and may be electrically connected to the electrode leads 150 of the plurality of battery cells 100 .
[55]
To this end, the plurality of bus bars 350 may be electrically connected to the electrode leads 150 of the plurality of battery cells 100 through a welding connection or the like.
[56]
The voltage sensing unit 400 is for sensing voltage information of the battery cells 100 , and includes an FPCB member 410 , a connector member 420 , a temperature sensor 430 , and sensing terminals 440 and 450 . ) may be included.
[57]
The FPCB member 410 may be disposed to extend along the longitudinal direction of the battery cells 100 between the top frame 330 and the top surfaces of the battery cells 100 . The FPCB member 410 may be implemented as a flexible printed circuit board (Flexible Printed Circuit Board).
[58]
The connector member 420 may be electrically connected to the FPCB member 410 and transmit data obtained from the temperature sensor 430 and the sensing terminals 440 and 450 to a Battery Management System (BMS). .
[59]
The temperature sensor 430 is provided on the FPCB member 410 and may be located near both edges of the battery cells 100 . In general, since the battery cell 100 has the highest temperature around the electrode leads 150 , it is preferable that the temperature sensor 430 be positioned at both edges of the battery cells 100 .
[60]
The sensing terminals 440 and 450 are attached to each of the first sensing terminals 440 attached to each of the bus bars 350 located in the front frame 310 and to each of the bus bars 350 located in the rear frame 320 . The second sensing terminals 450 may be used, and a voltage value at each of the bus bars 350 may be sensed.
[61]
The plurality of fixing jig holes 500 are provided on upper and lower surfaces of the bus bar frame assembly 300 , and the electrode leads 150 of the plurality of battery cells 100 and the plurality of bus bars ( During the welding process for the electrical connection of 350 , welding fixing jigs G for fixing the bus bar frame assembly 300 may be inserted.
[62]
The plurality of fixing jig holes 500 are provided on upper and lower surfaces of the front frame 310 and the rear frame 320 , and include base jig holes 510 and top jig holes 520 . may include
[63]
The base jig holes 510 are provided on the bottom surface of the bus bar frame assembly 300 , and the welding fixing jigs G may be inserted from the bottom during the welding process.
[64]
The base jig holes 510 may include edge jig holes 512 and auxiliary jig holes 514 .
[65]
The edge jig holes 512 may be formed at the bottom edge of the bus bar frame assembly 300 . Specifically, the edge jig holes 512 may be formed at bottom edges of the front frame 310 and the rear frame 320 of the bus bar frame assembly 300 .
[66]
The auxiliary jig holes 514 are provided between the edge jig holes 512 , and in the width direction of the bus bar frame assembly 300 , specifically, the front frame of the bus bar frame assembly 300 . 310 and the rear frame 320 may be disposed to be spaced apart from each other by a predetermined distance along the width direction.
[67]
The top jig holes 520 are provided on the upper surface of the bus bar frame assembly 300 , and the welding fixing jigs G may be inserted from above during the welding process.
[68]
The top jig holes 520 may include edge jig holes formed at an edge of the upper surface of the bus bar frame assembly 300 . Specifically, the top jig holes 520 may be formed at upper edges of the front frame 310 and the rear frame 320 of the bus bar frame assembly 300 .
[69]
In this embodiment, welding for electrical connection between the electrode leads 150 of the plurality of battery cells 100 and the plurality of bus bars 350 through the plurality of fixing jig holes 500 . During the process, the welding fixing jigs G may be inserted into the bus bar frame assembly 300 in both vertical directions of the bus bar frame assembly 300 to fix the bus bar frame assembly 300 .
[70]
Accordingly, in the present embodiment, during the welding process, both the vertical and horizontal flow of the bus bar frame assembly 300 are effectively prevented, so that the bus bar frame assembly 300 shakes, etc. can be minimized.
[71]
Therefore, in the present embodiment, through the plurality of fixing jig holes 500 , it is possible to significantly improve welding accuracy and welding quality during the welding process, and the electrode leads 150 and the bus bars ( 350) can also be much higher.
[72]
12 is a diagram for explaining a battery pack according to an embodiment of the present invention, and FIG. 13 is a diagram for explaining a vehicle according to an embodiment of the present invention.
[73]
12 and 13 , the battery pack 1 may include at least one battery module 10 according to the previous embodiment and a pack case 50 for packaging the at least one battery module 10 . can
[74]
The battery pack 1 may be provided in the vehicle V as a fuel source for the vehicle V. By way of example, the battery pack 1 may be provided in the vehicle V in an electric vehicle, a hybrid vehicle, and other ways in which the battery pack 1 may be used as a fuel source.
[75]
In addition, of course, the battery pack 1 may be provided in other devices, devices, and facilities, such as an energy storage system using a secondary battery, in addition to the vehicle V.
[76]
As such, the device, apparatus, and equipment including the battery pack 1 and the battery pack 1 such as the vehicle V according to the present embodiment include the battery module 10 described above. A battery pack 1 having all the advantages of one battery module 10 and a device, apparatus, and equipment such as a vehicle V having such a battery pack 1 can be implemented.
[77]
According to various embodiments as described above, in a welding bonding process between the electrode leads 150 of the battery cells 100 and the bus bars 350 of the bus bar frame assembly 300, the bus bar The battery module 10 capable of preventing the movement of the frame assembly 300, the battery pack 1 including the battery module 10, and a vehicle V including the battery pack 1 can provide
[78]
In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and it is common in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Various modifications may be made by those having the knowledge of, of course, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.
Claims
[Claim 1]
A battery module comprising: a plurality of battery cells; a bus bar frame assembly supporting the plurality of battery cells and having a plurality of bus bars electrically connected to electrode leads of the plurality of battery cells; and welding fixing pieces provided on upper and lower surfaces of the bus bar frame assembly for fixing the bus bar frame assembly during a welding process for electrically connecting the electrode leads of the plurality of battery cells and the plurality of bus bars A battery module comprising a; a plurality of fixing jig holes into which they are inserted.
[Claim 2]
According to claim 1, wherein the plurality of fixing jig holes, are provided on the bottom surface of the bus bar frame assembly, the base jig holes into which the welding fixing jigs are inserted during the welding process; and top jig holes provided on an upper surface of the bus bar frame assembly and into which the welding fixing jigs are inserted during the welding process.
[Claim 3]
According to claim 2, wherein the base jig holes, edge jig holes formed in the bottom edge of the bus bar frame assembly; and auxiliary jig holes provided between the edge jig holes and spaced apart from each other by a predetermined distance along the width direction of the bus bar frame assembly.
[Claim 4]
The battery module according to claim 2, wherein the top jig holes include edge jig holes formed at an edge of an upper surface of the bus bar frame assembly.
[Claim 5]
The apparatus of claim 1, wherein the bus bar frame assembly comprises: a front frame and a rear frame including the plurality of bus bars; and a top frame connecting the front frame and the rear frame, wherein the plurality of fixing jig holes are provided on upper and lower surfaces of the front frame and the rear frame.
[Claim 6]
The battery module according to claim 5, wherein the front frame and the rear frame are rotatably hinged with respect to the top frame.
[Claim 7]
[Claim 7] The method of claim 6, wherein the top frame has a plurality of anti-interference grooves for preventing interference with the plurality of fixing jig holes when the front frame and the rear frame are hinged to the top frame. A battery module, characterized in that it becomes.
[Claim 8]
The battery module according to claim 7, wherein the plurality of anti-interference grooves are provided in four edge regions of the top frame.
[Claim 9]
at least one battery module according to claim 1; and a pack case for packaging the at least one battery module.
[Claim 10]
A vehicle comprising a; the battery pack according to claim 9.