Title of the invention: Battery pack including fixing member, device including same, and method of manufacturing battery pack
Technical field
[One]
Cross-reference with related application(s)
[2]
This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0114408 filed September 21, 2018, and all contents disclosed in the documents of the Korean patent application are included as part of this specification.
[3]
The present invention relates to a battery pack, a device including the same, and a method for manufacturing a battery pack, wherein when fixing a battery module in the battery pack, a battery pack including a fixing member to increase fixing force, a device including the same, and a battery It relates to a method of manufacturing a pack.
Background
[4]
As the use of portable devices such as mobile phones, notebook computers, camcorders, and digital cameras has become common in the modern society, the development of technologies in the fields related to such mobile devices is becoming more active. In addition, secondary batteries that can be charged and discharged are a way to solve air pollution, such as existing gasoline vehicles that use fossil fuels, as well as electric vehicles (EV), hybrid electric vehicles (HEV), and plug-in hybrid electric vehicles ( P-HEV) is used as a power source, and the need for development of secondary batteries is increasing.
[5]
In the case of secondary batteries used in small devices, 2-3 battery cells are arranged, but in the case of secondary batteries used in mid- to large-sized devices such as automobiles, a battery module in which a plurality of battery cells are electrically connected is used.
[6]
In order to increase the efficiency of a device using a secondary battery, it is preferable to use a secondary battery that has a small size and a low weight and a large capacity, and thus, a prismatic battery, a pouch-type battery that is charged with a high degree of integration and has a small weight to capacity. This is mainly used.
[7]
In particular, in the case of a battery module used in a medium- to large-sized device, a plurality of battery cells are electrically connected in series in order to provide a capacity greater than a specific value required by the device, and in this case, a method of connecting a plurality of battery cells , The stability of the secondary battery itself differs depending on the fixing method.
[8]
In general, as a method of fixing the battery module inside the battery pack, a method of directly fixing the battery module using a bolt after stacking a plurality of battery cells is mainly used.
[9]
1 is a diagram showing a structure of fixing a battery module using a bolt as a method that is conventionally used.
[10]
As shown in FIG. 1, as a method of fixing the existing battery module, there is a method of using a bolt. In this case, the bolt is fastened to the lower side of the battery module to fix the battery module in a tray or a lower case of the battery pack. However, since the thickness of the part to which the bolt is fastened is inevitably thin, the fixing force is low, and there is a problem that it is difficult to meet dimensional safety in the fastened structure, so the stability of the battery module cannot be maintained. there is a problem.
[11]
When it is difficult to directly fix the battery module as shown in FIG. 1, there is a method of indirectly fixing the battery module to the battery pack using a bracket. This is to arrange the battery module and the bracket to overlap, and fix it using the reaction force generated here.
[12]
However, in the case of fixing using the existing bracket, there was a problem that it was difficult to increase the fixing power of the battery module against vibration and shock applied to the battery module. There was a problem.
[13]
In the present invention, there is a need to develop a battery pack including a fixing member to improve the stability of the battery module in fixing the battery module as compared to the conventional battery module fixing method.
Detailed description of the invention
Technical challenge
[14]
Embodiments of the present invention have been proposed to solve the above problems of the previously proposed methods, and by processing the surface of the member fixing the battery module, the fixing force is increased to prevent vibration and impact applied to the battery module. It is an object of the present invention to provide a battery pack including a fixing member, a device including the same, and a method of manufacturing a battery pack so that the battery module can be stably fixed.
[15]
However, the problems to be solved by the embodiments of the present invention are not limited to the above-described problems, and may be variously extended within the scope of the technical idea included in the present invention.
Means of solving the task
[16]
According to a feature of the present invention for achieving the above object, a battery pack including a fixing member includes a battery module including a plurality of battery cells, a tray located at a lower end of the battery module to accommodate the battery module, And a bracket attached to and coupled to a lower side of the battery module, adjacent to one side of the tray, and a surface of the bracket in contact with the battery module and a lower side of the battery module. At least one of the surfaces of the adjacent trays may have a wedge shape.
[17]
The rigidity of the bracket and the tray may be higher than that of the battery module.
[18]
The bracket may be formed of steel.
[19]
The tray may be formed of steel.
[20]
The bracket may be a hold-down bracket.
[21]
In a state in which the battery module is mounted on the tray, it may further include an upper case positioned at an upper end of the battery module to surround the battery module.
[22]
A concave shape may be formed on the surface of the battery module in contact with the bracket and the wedge-shaped surface portion of the tray according to the processed shape of the bracket and the tray.
[23]
In addition, according to another feature of the present invention for achieving the above object, a battery pack manufacturing method includes a battery module, a tray located at the lower end of the battery module, and accommodating the battery module, and adjacent to one side of the tray. In this way, in the battery pack including a bracket mounted and coupled to a lower side of the battery module, the step of processing to form a wedge shape on at least one of the surface of the bracket and the surface of the tray, and the Arranging the processed portion of the bracket and the tray adjacent to one side of the lower end of the battery module, may include the step of pressing toward the battery module.
[24]
The step of forming a concave shape according to the processed shape of the bracket and the tray on the surface of the battery module in contact with the processed surface portion of the bracket and the tray may be further included.
[25]
The rigidity of the bracket and the tray may be higher than that of the battery module.
[26]
The bracket may be formed of steel.
[27]
The tray may be formed of steel.
[28]
In addition, according to another feature of the present invention for achieving the above object, the device includes a battery module including a plurality of battery cells, a tray located at a lower end of the battery module to accommodate the battery module, and the tray Adjacent to one side of the battery module, including a bracket mounted and coupled to the lower side of the battery module, the surface of the bracket in contact with the battery module, and disposed adjacent to the bracket in contact with the lower side of the battery module At least one of the surfaces of the tray may include a battery pack having a wedge shape as a power source.
Effects of the Invention
[29]
According to embodiments of the present invention, the fixing force of the battery module can be increased by processing the surface of the fixing member used for fixing the battery module to increase the surface friction between the contact surfaces, and even against vibration and shock, the battery module Can be stably fixed.
Brief description of the drawing
[30]
1 is a diagram showing a structure of fixing a battery module using a bolt as a method that is conventionally used.
[31]
2 is a view showing a battery pack including a fixing member according to an embodiment of the present invention.
[32]
3 is a view showing a cross-section of a battery pack including a fixing member according to an embodiment of the present invention.
[33]
4 is a view for explaining a shape of a processed surface in a battery pack including a fixing member according to an embodiment of the present invention.
[34]
5 is a diagram illustrating a pressure applied to a bracket in a battery pack including a fixing member according to an embodiment of the present invention.
Mode for carrying out the invention
[35]
Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.
[36]
In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.
[37]
In addition, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, and the present invention is not necessarily limited to the illustrated bar. In the drawings, the thickness is enlarged to clearly express various layers and regions. And in the drawings, for convenience of description, the thickness of some layers and regions is exaggerated.
[38]
In addition, when a part such as a layer, film, region, plate, etc. is said to be "on" or "on" another part, this includes not only "directly over" another part, but also a case where another part is in the middle. . Conversely, when one part is "right above" another part, it means that there is no other part in the middle. In addition, to be "on" or "on" the reference part means to be located above or below the reference part, and to mean that it is located "above" or "on" in the direction opposite to gravity no.
[39]
In addition, throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.
[40]
In the present invention, in order to solve the problem in the existing battery module fixing method, the area of ​​the part that serves to fix the battery module was increased to enhance the fixing force, and the battery against vibration and shock in all directions toward the battery module In order to prevent shaking and separation of the module, the surface of the extended area was processed to increase friction. It will be described in more detail with reference to FIGS. 2 to 5 below.
[41]
2 is a view showing a battery pack including a fixing member according to an embodiment of the present invention.
[42]
2 is a view in which the tray 200 and the bracket 300, which are part of the configuration of the battery pack 10, are coupled to the battery module 110, as shown in FIG. 2, a fixing member according to an embodiment of the present invention The battery pack 10 includes, a battery module 110 including a plurality of battery cells 100, a tray 200 located at the lower end of the battery module 110 and accommodating the battery module 110, And a bracket 300 that is adjacent to one side of the tray 200 and is mounted and coupled to a lower side of the battery module 110.
[43]
In a state in which the battery module 110 is mounted on the tray 200, it may further include an upper case 400 that is positioned at the top of the battery module 110 to surround the battery module 110, and the bracket 300 A hold-down bracket may be used, and the battery cell 100 is a plate-shaped battery cell, and the battery cells 100 may be connected in a series manner.
[44]
In particular, in the present invention, among the surfaces of the bracket 300 in contact with the battery module 110 and the surface of the tray 200 in contact with the lower side of the battery module 110 and disposed adjacent to the bracket 300 At least one is processed, and when the bracket 300 and the tray 200 are coupled to the battery module 110 to fix the battery module 110, frictional force is generated in the processed part by pressing, It is a feature of the present invention to be able to reinforce mutual fixation.
[45]
3 is a view showing a cross-section of a battery pack including a fixing member according to an embodiment of the present invention.
[46]
3, from the cross section of the battery pack 10 including the fixing member according to the present embodiment, a part of the tray 200 in contact with the battery module 110 and the surface of the bracket 300 are processed. You can check the shape, and you can see that the processed part has a wedge shape.
[47]
Specifically, FIG. 3 is a diagram showing a state in which the bracket 300 and the tray 200 are pressed and fixed to the battery module 110. When pressing the bracket 300 and the tray 200, the bracket ( 300) and the surface of the battery module 110 in contact with the wedge-shaped surface portion of the tray 200, a concave shape is formed according to the processed shape of the bracket 300 and the tray 200, that is, a wedge shape. I can confirm.
[48]
4 is a view for explaining a shape of a processed surface in a battery pack including a fixing member according to an embodiment of the present invention.
[49]
That is, FIG. 4 shows a wedge shape formed on the surface of the bracket 300 or the tray 200, and the processed surfaces of the bracket 300 and the tray 200 in the present invention are as shown in FIG. The same, multiple wedge shapes can be formed. That is, the surfaces of the bracket 300 and the tray 200 may have the same shape as in a wedge grip. However, the shape of the processed surface of the bracket 300 and the tray 200 is not limited thereto, and any shape capable of increasing friction at the contact surface is possible.
[50]
5 is a diagram illustrating a pressure applied to a bracket in a battery pack including a fixing member according to an embodiment of the present invention.
[51]
According to this embodiment, a bracket 300 and a tray 200 are mounted on one side and a bottom side of the battery module 110, respectively, and as shown in FIG. 5, the battery module 110 and the bracket The surface to which the 300 is in contact, the surface where the tray 200 at a position adjacent to the bracket 300 is in contact with the lower portion of the battery module 110, and a projection is formed on each surface of the bracket 300 and the tray 200 And can apply pressure from the outside on each side. In the present invention, by applying pressure to the battery module 110 in a direction perpendicular to the surface of the bracket 300 and the tray 200 whose surfaces are processed as described above, the fixing force for the battery module 110 can be increased. .
[52]
Specifically, the bracket 300 and the tray 200 may be formed of steel, and the outer surface of the battery module 110 including the battery cell may be formed of plastic. In this case, the bracket 300 ) And the stiffness of the tray 200 is higher than that of the battery module 110. Due to this, by pressing as in FIG. 5, the surface of the bracket 300 having high rigidity and the surface of the tray 200 are processed to press the surface of the battery module 110 with relatively low rigidity As a result, the shape as in FIG. 4 is engraved on the surface of the battery module 110.
[53]
In this way, a protruding shape and a concave shape between the pressed and pressed elements are respectively engraved to prevent slipping between the respective elements, and frictional force is generated to enhance the fixing force. In particular, it is possible to maintain a high fixing force against vibration applied from a specific direction to the battery module 110, vibration applied from all directions other than the shock, and shock.
[54]
A method of manufacturing a battery pack according to an embodiment of the present invention includes a battery module, a tray located at the bottom of the battery module, and adjacent to one side of the tray, and mounted on the bottom side of the battery module to be combined. In the battery pack including the bracket, the step of processing to form a wedge shape on at least one of the surface of the bracket and the surface of the tray (S100), and the processed portion of the bracket and the tray to the bottom of the battery module It is disposed adjacent to one side and may include the step of pressing toward the battery module (S200).
[55]
Depending on the embodiment, a step (S300) of forming a concave shape according to the processed shape of the bracket and the tray on the surface of the battery module in contact with the processed surface portion of the bracket and the tray may be further included.
[56]
When the bracket 300 and the tray 200 are pressed against the battery module 110 to form a shape on the battery module 110 to be fixed to each other, the fixing force is strengthened by mutual frictional force. In this case, the rigidity of the bracket 300 and the tray 200 may include a fixing member, which is higher than the rigidity of the battery module 110, and according to an embodiment, the bracket 300 and the tray 200 It may be formed of steel, and the surface of the battery module 110 may be formed of a plastic material.
[57]
In addition, the device according to an embodiment of the present invention includes a battery module 110 including a plurality of battery cells 100, a tray that is located at the bottom of the battery module 110 and accommodates the battery module 110 ( 200), and adjacent to one side of the tray 200, including a bracket 300 mounted and coupled to the lower side of the battery module 110, and the surface of the bracket 300 in contact with the battery module 110 , At least one of the surfaces of the tray 200 that is in contact with the lower one side of the battery module 110 and is disposed adjacent to the bracket 300 may include a battery pack 10 having a wedge shape as a power source.
[58]
The device may be an electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle, but is not limited thereto.
[59]
As described above, the present invention is a battery pack including a fixing member, and in a conventional method for fixing a battery module using a bolt, the fixing force of the battery module is low, and the battery module moves when a load of a predetermined value or more is applied. In addition, in order to solve the problem of low stability of the battery module from vibration and shock applied to the battery module in the method of using the conventional general bracket, by processing the member fixing the battery module, It is significant in that it can stably fix the battery module by increasing the fixing force of the battery module from vibration and shock in all directions.
[60]
Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of
[61]
[Explanation of code]
[62]
10: battery pack
[63]
100: battery cell
[64]
110: battery module
[65]
200: tray
[66]
300: bracket
[67]
400: upper case
Claims
[Claim 1]
A battery module including a plurality of battery cells; A tray located below the battery module to accommodate the battery module; And a bracket attached to and coupled to a lower side of the battery module, adjacent to one side of the tray, and a surface of the bracket in contact with the battery module and a lower side of the battery module. At least one of the surfaces of the trays disposed adjacent to each other includes a fixing member having a wedge shape.
[Claim 2]
The battery pack of claim 1, wherein the bracket and the tray have a rigidity higher than that of the battery module.
[Claim 3]
The battery pack according to claim 2, wherein the bracket includes a fixing member formed of steel.
[Claim 4]
The battery pack according to claim 2, wherein the tray includes a fixing member formed of steel.
[Claim 5]
The battery pack according to claim 1, wherein the bracket is a hold-down bracket.
[Claim 6]
The battery pack as claimed in claim 1, further comprising an upper case positioned at an upper end of the battery module to surround the battery module while the battery module is mounted on the tray.
[Claim 7]
The battery pack according to claim 1, wherein the surface of the battery module in contact with the wedge-shaped surface portion of the bracket and the tray includes a fixing member having a concave shape according to the processed shape of the bracket and the tray .
[Claim 8]
Battery module; A tray located below the battery module to accommodate the battery module; And a bracket that is adjacent to one side of the tray and is mounted and coupled to a lower side of the battery module, wherein a wedge shape is formed on at least one of the surface of the bracket and the surface of the tray. Processing; And disposing the processed portion of the bracket and the tray adjacent to a lower side of the battery module and pressing toward the battery module.
[Claim 9]
The battery pack of claim 8, further comprising forming a concave shape according to the processed shape of the bracket and the tray on the surface of the battery module in contact with the processed surface portion of the bracket and the tray. Manufacturing method.
[Claim 10]
The method of claim 8, wherein the bracket and the tray have a higher rigidity than that of the battery module.
[Claim 11]
The method of claim 10, wherein the bracket is formed of steel.
[Claim 12]
The method of claim 10, wherein the tray is formed of steel.
[Claim 13]
A device comprising the battery pack according to claim 1 as a power source.