Title of Invention: High-voltage battery module including external bridge bus bar
technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 2019-0146881 dated November 15, 2019, and all contents disclosed in the literature of the Korean patent application are incorporated as a part of this specification.
[2]
The present invention relates to a high voltage battery module including an external bridge bus bar. Specifically, it relates to a battery module in which an external bridge bus bar structure is applied to a high voltage battery module of 60V or higher.
background
[3]
Unlike small mobile devices such as smartphones, mid-to-large devices such as electric vehicles require high-power and large-capacity batteries. A secondary battery applied to an electric vehicle is typically used in a form in which a plurality of secondary battery cells (hereinafter, “cells”) are aggregated. It is used in the form of a battery module in which a plurality of cells are connected in series/parallel, etc. and a battery pack combining a plurality of them.
[4]
A battery module used in an electric vehicle requires a plurality of cells to be connected in series, parallel, or a mixture of series and parallel in order to provide the output and capacity required by medium to large-sized devices. The battery module must also be able to maintain a stable structure against vibration and shock due to the characteristics of the vehicle.
[5]
Patent Document 1 relates to a conventional medium-large battery module, wherein a plurality of cells in the battery module are electrically connected to each other by being fixed to a plurality of bus bars in which electrode leads are provided in the form of metal plates.
[6]
Patent Document 1 is a monoframe type battery module, a battery module manufactured by mounting a bus bar and a sensing means in a cell assembly formed by stacking cells, and then accommodating them in a monoframe integrally provided in a rectangular tube shape. A pouch-type battery cell, which is very easy to stack, is mainly used for such a monoframe-type battery module.
[7]
Patent Document 1 discloses a cell assembly constituted by stacking pouch-type secondary battery cells having bidirectional electrode leads, a first vertical plate and a second vertical plate respectively disposed on both sides of the cell assembly corresponding to the positions of the electrode leads of the cells. and a bus bar frame including an upper plate connected to the first and second vertical plates and disposed on the cell assembly, and each tube shape such that the cell assembly to which the bus bar frame is mounted is inserted and disposed in the inner space Includes a monoframe formed of.
[8]
1 is an exploded perspective view schematically showing the structure of a conventional battery module.
[9]
Referring to FIG. 1 , the battery module 100 is a cell assembly 110 configured by stacking cells 111 in which the electrode leads 112 are bidirectional, corresponding to the positions of the electrode leads 112 of the cells 111 . A first vertical plate 121 and a second vertical plate 122 disposed on both sides of the cell assembly 110, respectively, and the first vertical plate 121 and the second vertical plate 122 are connected to the The bus bar frame 120 including the upper plate 123 disposed on the cell assembly 110 and the cell assembly 110 on which the bus bar frame 120 is mounted are inserted into the inner space in each tube shape. and a monoframe 130 formed thereon. Here, the side frame 140 is coupled to the monoframe 130 to complete the battery module 100 .
[10]
A plurality of bus bars 126 are provided on outer surfaces of the first vertical plate 121 and the second vertical plate 122 , and the electrode leads 112 of the cells 111 are formed on the first vertical plate. It is electrically connected to the corresponding bus bar 126 through the slot formed in the 121 and the second vertical plate 122 .
[11]
2 is a perspective view of the conventional battery module 100 with the first side frame 140 disposed on the front side. The final input/output terminals 141 and 142 are provided on the first side frame 140 , and the final input/output terminals 141 and 142 are provided by protruding a part of the bus bar 126 or separately on the bus bar 126 . It can be provided by inserting a bus bar of
[12]
Battery modules are being applied not only to small cars, but also to medium and large vehicles such as trucks. Accordingly, the output of each battery module also increases, and recently, a high voltage battery module of 60V or more is being used. In this case, as the voltage provided through the final input/output terminal is 60V, the risk of an accident is greatly increased compared to the conventional battery module.
[13]
There are factors that determine the degree of disaster caused by electric shock, such as current, energization time, and energization path, but the most important is current, not voltage. When an alternating current flows through the human body, even at 5 mA, considerable pain is felt, and at 50 mA, it can lead to death.
[14]
Typically, when the skin of the human body is dry, the resistance value is about 4,000Ω, and when the skin is moist, it decreases to about 2,000Ω. It is electrocuted by a voltage of 100V, and a current of 25mA when the skin is dry and 50mA when the skin is wet flows. When a current of 10 to 20 mA or more flows, the muscles of the human body become rigid and cannot escape from the electric shock.
[15]
If one conventional battery module is 25V, and if the human body is dry, a low current of 6.25mA (25V/4000Ω) flows, so that the operator can easily get out of contact with the battery module. However, in the case of the recently introduced 60V battery module, since a current of 15 mA or more flows, if an operator is electrocuted, the muscles stiffen and thus cannot escape the electric shock.
[16]
As the demand for high-voltage battery modules is increasing, there is a need for a method that can guarantee the safety of high-voltage battery modules whose risk has increased qualitatively compared to conventional battery modules.
[17]
(Patent Document 1) Republic of Korea Patent Publication No. 2019-0114406
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[18]
The present invention is intended to solve the above problems, and the high voltage battery module minimizes restrictions in using the high voltage battery module while removing the risk factors that may harm the human body during the manufacturing and transportation of the high voltage battery module. aims to provide
means of solving the problem
[19]
In order to solve the above problems, the present invention provides a cell assembly configured by stacking pouch-type secondary battery cells having an electrode lead in both directions, and a first disposed on both sides of the cell assembly corresponding to the position of the electrode lead of the cells. A battery module in which a plurality of bus bars are provided on a vertical plate and a second vertical plate, and the first vertical plate and the second vertical plate, and electrode leads of the cells are electrically connected to the bus bars,
[20]
A bus bar connected to the final input/output terminal or the final input/output terminal of the battery module is disposed on the first vertical plate, and a bus bar electrically disconnected from the middle of the second vertical plate is disposed on the second vertical plate The bus bar electrically disconnected in the middle provides a battery module connected by a separate bridge bus bar.
[21]
A bus bar frame including an upper plate connected to the first and second vertical plates and disposed on the cell assembly, and each tube shape so that the cell assembly to which the bus bar frame is mounted is inserted and disposed in the inner space It may further include a monoframe formed.
[22]
The cell assembly on which the bus bar frame is mounted is inserted into the inner space and coupled to the monoframe while protecting the outer surfaces of the first vertical plate and the second vertical plate of the monoframe formed in a tubular shape from the outside. It may further include a first side frame and a second side frame.
[23]
A bridge coupling portion to which the bridge bus bar can be coupled is disposed on the upper end of the battery module. In this case, the bridge coupling part may be provided on the upper end of the second vertical plate.
[24]
The bridge bus bar may be operated from the outside of the battery module to electrically connect the electrically disconnected bus bar to the second vertical plate.
[25]
In addition, the second vertical plate may have two or more bus bars electrically disconnected in the middle, and correspondingly, the same number of bridge bus bars and bridge coupling portions are provided.
[26]
The present invention also provides a battery pack including the battery module.
[27]
The present invention also provides a method of not connecting the bridge bus bar until electricity is supplied using the battery module in the method of using the battery module.
[28]
The present invention may be provided in a state where any combination of the above inventions is possible.
Brief description of the drawing
[29]
1 is an exploded perspective view schematically showing the structure of a conventional battery module.
[30]
2 is a perspective view of a conventional battery module first side frame disposed in front.
[31]
3 is a perspective view of a second side frame according to the present invention disposed in front.
[32]
4 is an enlarged schematic view of a bridge coupling unit according to the present invention.
Modes for carrying out the invention
[33]
Hereinafter, embodiments in which those of ordinary skill in the art to which the present invention pertains can easily practice the present invention will be described in detail with reference to the accompanying drawings. However, in the detailed description of the principle of operation of a preferred embodiment of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.
[34]
In addition, the same reference numerals are used throughout the drawings for parts having similar functions and functions. Throughout the specification, when it is said that a part is connected to another part, it includes not only a case in which it is directly connected, but also a case in which it is indirectly connected with another element interposed therebetween. In addition, the inclusion of any component does not exclude other components unless otherwise stated, but means that other components may be further included.
[35]
Hereinafter, the present invention will be described in more detail.
[36]
Since the present invention is an improvement of the second vertical plate and the second side frame in the conventional battery module, it will be described.
[37]
3 is a perspective view of a second side frame according to the present invention disposed in front.
[38]
4 is an enlarged schematic view of a bridge coupling unit according to the present invention.
[39]
A bridge coupling part 159 is disposed at the upper end of the battery module, and the bridge coupling part 159 may extend from the bus bar of the second vertical plate 122 or be connected to the bus bar of the second vertical plate 122 . A portion of the busbar exposed to the outside is shown. The bus bar is electrically shorted in the top view of FIG. 3 .
[40]
The short-circuited bus bar is connected using a bridge bus bar 155 having a plate-shaped rectangular shape, and it is fixed using an assembly screw 157 . The bottom view of FIG. 3 is a state in which they are combined.
[41]
4 is an enlarged view of the bridge coupling part 159 . 4 illustrates an external connection bus bar 153 that is an externally exposed bus bar that can be connected to the bus bar of the second vertical plate 122 as an embodiment. The bus bar 153 for external connection is a conductive material and is fixed to the upper protruding portion of the second vertical plate 122 of the non-conductive material, and these are again connected to the electrode lead of the second vertical plate 112 directly on the bus bar. Connected. The external connection bus bar 153 may be manufactured as a separate component or may be formed integrally with the bus bar directly connected to the electrode lead of the second vertical plate 112 .
[42]
60V has been mentioned as an example of the present invention, and although only one bridge bus bar is exemplified in the drawing, in the case of a higher voltage or in a humid working environment, even in the case of a conventional low voltage battery module, one or more bridge bus bars can be used to expand its scope.
[43]
As the specific parts of the present invention have been described in detail above, for those of ordinary skill in the art, these specific descriptions are only preferred embodiments, and the scope of the present invention is not limited thereto. It is obvious to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention, and it is natural that such variations and modifications fall within the scope of the appended claims.
Industrial Applicability
[44]
As described above, the present invention is intended to solve the above problems, and there is no restriction in using the high voltage battery module while removing the risk factors that may harm the human body during the manufacturing and transportation of the high voltage battery module. It is possible to provide a minimized high voltage battery module. In particular, by dividing the electrical connection of the cell assembly disposed inside the battery module into two or more before it is finally used to supply electricity, there is an advantage in that the voltage can be lowered below the voltage that can harm the human body.
[45]
(Explanation of symbols)
[46]
100: battery module
[47]
110: cell assembly
[48]
111 : cell
[49]
112: electrode lead
[50]
120: bus bar frame
[51]
121: first vertical plate
[52]
122: second vertical plate
[53]
123: top plate
[54]
125: bus bar
[55]
130: mono frame
[56]
140: first side frame
[57]
141, 142: final input/output terminals
[58]
150: second side frame
[59]
153: bus bar for external connection
[60]
155: bridge bus bar
[61]
157: assembly screw
[62]
159: bridge coupling part
Claims
[Claim 1]
a cell assembly configured by stacking pouch-type secondary battery cells having bidirectional electrode leads; A plurality of bus bars are provided on the first vertical plate and the second vertical plate and the first vertical plate and the second vertical plate respectively disposed on both sides of the cell assembly corresponding to the position of the electrode leads of the cells, In the battery module in which the electrode leads of the cells are electrically connected to the bus bars, a bus bar connected to the final input/output terminal or the final input/output terminal of the battery module is disposed on the first vertical plate, and the second vertical plate A battery module in which a bus bar electrically disconnected in the middle is disposed, and the bus bar electrically disconnected in the middle of the second vertical plate is connected to the second vertical plate by a separate bridge bus bar.
[Claim 2]
The apparatus of claim 1, further comprising: a bus bar frame connected to the first and second vertical plates and formed of an upper plate disposed on the cell assembly; and a monoframe formed in each tubular shape so that the cell assembly on which the bus bar frame is mounted is inserted and disposed in an internal space. A battery module further comprising a.
[Claim 3]
The method according to claim 2, wherein the cell assembly on which the bus bar frame is mounted is inserted into the inner space while protecting the outer surfaces of the first vertical plate and the second vertical plate of the monoframe formed in a tubular shape from the outside. a first side frame and a second side frame respectively coupled to the monoframe; A battery module further comprising a.
[Claim 4]
The battery module according to claim 1, wherein a bridge coupling portion to which a bridge bus bar can be coupled is disposed on the upper end of the battery module.
[Claim 5]
The battery module according to claim 4, wherein the bridge coupling part is provided on an upper end of the second vertical plate.
[Claim 6]
The battery module according to claim 1, wherein the bridge bus bar is operated from the outside of the battery module to electrically connect a bus bar electrically disconnected in the middle to the second vertical plate.
[Claim 7]
The battery module according to claim 1, wherein the second vertical plate has two or more bus bars electrically disconnected in the middle.
[Claim 8]
A battery pack comprising the battery module according to any one of claims 1 to 7.
[Claim 9]
In the method of using the battery module according to any one of claims 1 to 7, the bridge bus bar is not connected until electricity is supplied using the battery module.