KR20240017613A - Battery Module And Battery Pack Including The Same - Google Patents

Abstract

The present invention relates to a battery module and a battery pack including the same, and specifically, a lower case provided with a space; an upper case located above the lower case; a battery holder stored in the lower case and the upper case and fixing a plurality of cylindrical battery cells; and a bus bar on one side of which is connected to the battery holder and on the other side of which is electrically connected to a cable portion. It relates to a battery module and a battery pack including the same.

Description

Battery module and battery pack including the same {Battery Module And Battery Pack Including The Same}

The present invention relates to a battery module and a battery pack containing the same. Specifically, a battery module that can flexibly cope with tolerances that occur during production or assembly and that can minimize the stress transmitted to the bus bar even when vibration or external shock occurs. and a battery pack containing the same.

Recently, the demand for secondary batteries that can store the generated electrical energy is increasing due to air pollution caused by the use of fossil fuels and the development of alternative energy due to energy depletion. Secondary batteries that can be charged and discharged are widely used in various fields such as mobile devices, electric vehicles, hybrid electric vehicles, and industrial robots.

The capacity of secondary batteries, which are used as an energy source for various electronic devices that are indispensable in modern society, is increasing due to the increased use and complexity of mobile devices and the development of electric vehicles. In order to meet user demand, a large number of battery cells are placed in small devices, but battery modules that electrically connect multiple battery cells or battery packs that include multiple such battery modules are used in automobiles, etc.

Meanwhile, bus bars are used for electrical connection with electrode leads or devices, and various types of bus bars are required depending on the capacity and application field.

Bus bars are generally fixed using welding or bolts, but due to tolerances that occur during production or assembly, vibration or shock that occurs during use, etc., the product must be discarded or the bus bar breaks due to stress due to deformation. Problems may arise.

Korean Patent Publication No. 2019-0073933 (published on June 27, 2019)

The purpose of the present invention to solve the above problems is to provide a battery module having a structure that can be used without disposal even if tolerances occur during production or assembly, and a battery pack including the same.

Another object of the present invention is to provide a battery module and a battery pack including the same that can minimize stress transmitted to the bus bar even when external shock or vibration occurs.

In order to achieve the above object, the battery module according to the present invention includes a lower case 1100 provided with a space; an upper case 1200 located above the lower case 1100; A battery holder 1300 stored in the lower case 1100 and the upper case 1200 and fixing a plurality of cylindrical battery cells; And a bus bar 1400, one side of which is connected to the battery holder 1300 and the other side of which is electrically connected to the cable portion 2100, wherein the bus bar 1400 is located on one side of the battery holder 1300. A first area 1410 located in the height direction (Y-axis direction), a second area 1420 extending from the bottom of the first area 1410 in the width direction (X-axis direction), and the second area 1420 ) a plate-shaped third region 1430 extending from one end toward the longitudinal direction (Z-axis direction), and an upper end of the third region 1430 to be positioned parallel to the bottom surface of the lower case 1100 It is composed of a plate-shaped fourth region 1440 extending in the width direction (X-axis direction) and provided with a fourth fastening hole 1441 for fixing to the cable portion 2100, and the first region 1410 and the second region 1420 is in close contact with one side of the battery holder 1300, and the third region 1430 and fourth region 1440 are positioned to protrude outside one side of the battery holder 1300. It is characterized by:

Additionally, in the battery module according to the present invention, a first fastening hole 1411 is provided in the first area 1410, and a third fastening hole 1422 is provided in the second area 1420, and the first fastening hole A first bolt 1510 passes through 1411, and a third bolt 1530 passes through the third fastening hole 1422, so that the bus bar 1400 is fixed to one side of the battery holder 1300. do.

In the battery module according to the present invention, the cable part 2100 has a first cable 2110 and a connection part 2120 connected to the fourth area 1440 while being fixed to one end of the first cable 2110. Including, the connection portion 2120 includes a first connection member 2121 fixed to one end of the first cable 2110, and extending parallel to the bottom surface of the lower case 1100 from the connection member 2121. It consists of a plate-shaped second connecting member 2122 with a third through hole 2122' through which the bolt passes, and the second connecting member 2122 is in close contact with the upper surface of the fourth area 1440, It is characterized by being fixed by 4 bolts (1540) and nuts (1560).

In the battery module according to the present invention, the fourth bolt 1540 is located on the upper surface of the second connecting member 2122, and the nut 1560 is a polygonal nut located on the lower surface of the fourth region 1440. Do it as

In the battery module according to the present invention, the bottom surface of the lower case 1100 is characterized by a receiving groove 1110 for receiving the nut 1560 and the body portion 1542 of the fourth bolt 1540. Do it as

In the battery module according to the present invention, the receiving groove 1110 includes a first receiving groove 1111, a support jaw 1112 extending inward from the first receiving groove 1111, and a support jaw 1112. It is characterized by being composed of a second receiving groove 1113 extending downward.

In the battery module according to the present invention, the first receiving groove 1111 has the same external shape as the nut 1560, but the first receiving groove width (W1) is larger than the nut width (W1), and the second receiving groove diameter ( D1) is characterized in that it is larger than the fourth bolt body diameter (D2).

In the battery module according to the present invention, the first receiving groove height (H1) is characterized in that it is equal to or greater than the nut height (H3).

In the battery module according to the present invention, the outer surface of the battery holder 1300 is provided with one or more through holes through which the fifth bolt 1550 passes, and the lower case 1100 is provided so that the fifth bolt 1550 is fixed. The bottom surface is characterized by a fastening groove 1120 made of a nut made by insert injection molding.

Additionally, the present invention provides a battery pack including the battery module according to any one of the above-mentioned items.

In addition, the battery pack according to the present invention includes the battery modules 1000 consisting of a pair positioned at a predetermined distance apart; A plurality of cable units (2000); And a connection terminal 3000 fastened to the device.

Additionally, in the battery pack according to the present invention, the cable portion 2000 is a first cable portion 2100 that electrically connects a pair of battery modules, one side of which is connected to one battery module, and the other side of which is connected to the connection terminal. It is characterized in that it includes a second cable part 2200 connected to (3000), and a third cable part 2300 where one side is connected to the remaining battery module and the other side is connected to the connection terminal 3000.

Additionally, in the battery pack according to the present invention, the device is characterized as a robot.

As described above, according to the battery module and the battery pack including the same according to the present invention, the bus bar and cable are fixed to each other by bolts and nuts, and the lower case of the battery module is provided with a receiving groove larger than the nut to be accommodated. Therefore, it has the advantage of being able to be used without discarding even if a tolerance occurs in the bus bar.

In addition, according to the battery module according to the present invention and the battery pack containing the same, the inner side of the receiving groove and the nut are spaced apart by a predetermined distance, so even if external shock or vibration occurs, the stress applied to the bus bar can be reduced, which can reduce the stress applied to the bus bar. It has the advantage of minimizing judgment.

In addition, according to the battery module and the battery pack including the same according to the present invention, since the nut is accommodated in the receiving groove, it is possible to prevent the nut from loosening and has the advantage of preventing accidents due to loss.

1 is a perspective view of a battery pack including a pair of battery modules according to a preferred embodiment of the present invention.
FIG. 2 is a plan view of the battery pack shown in FIG. 1.
FIG. 3 is a perspective view showing the inside of the battery pack shown in FIG. 1.
Figure 4 is a perspective view of a battery holder constituting a battery module.
Figure 5 is a perspective view and front view of the bus bar.
Figure 6 is an enlarged perspective view of part 'A' of Figure 3.
Figure 7 is an exploded perspective view of Figure 6.
Figure 8 is a front view of Figure 6.
Figure 9 is a view of the inside of the lower case of the battery module.
Figure 10 is an enlarged view of part 'B' of Figure 9.
Figure 11 is a cross-sectional view of part 'B' of Figure 9 cut along the XY plane.
Figure 12 is a cross-sectional view of a state in which the bus bar and the first cable are fastened.

Hereinafter, with reference to the attached drawings, an embodiment by which a person skilled in the art can easily carry out the present invention will be described in detail. However, when explaining in detail the operating principle 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 gist of the present invention, the detailed description will be omitted.

In addition, the same reference numerals are used for parts that perform similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only cases where it is directly connected, but also cases where it is indirectly connected through another element in between. Additionally, including a certain component does not mean excluding other components unless specifically stated to the contrary, but rather means that other components may be further included.

Hereinafter, a battery module and a battery pack including the same according to the present invention will be described with reference to the attached drawings.

In the drawings related to the battery holder, the X-axis direction is defined as the width direction, the Y-axis direction is defined as the height direction, and the Z-axis direction is defined as the length direction.

FIG. 1 is a perspective view of a battery pack including a pair of battery modules according to a preferred embodiment of the present invention, FIG. 2 is a plan view of the battery pack shown in FIG. 1, and FIG. 3 is an interior view of the battery pack shown in FIG. 1. A perspective view showing and Figure 4 is a perspective view of the battery holder constituting the battery module.

1 to 4, the battery pack according to the present invention includes a pair of battery modules 1000 positioned at a predetermined distance apart, a plurality of cable units 2000, and a connection terminal (connected to the device). 3000).

This battery pack can be applied to devices such as human-shaped robots, but is not particularly limited.

Since the pair of battery modules 1000 spaced apart from each other are arranged to be symmetrical to each other but have the same configuration, the description will be based on the battery module 1000 located on the right side of the drawing.

The battery module 1000 includes a lower case 1100, an upper case 1200 located above the lower case 1100, a battery holder 1300, and a bus bar 1400.

Here, the lower case 1100 and the upper case 1200 are provided with a space of a certain size to accommodate the battery holder 1300, and one battery module 1000 accommodates two battery holders 1300. However, this can be changed at any time.

As shown in Figure 4, the battery holder 1300 is positioned with a first holder 1310 and a second holder 1320 in close contact so as to fix a plurality of cylindrical battery cells, and on the side, that is, the YZ plane. A plurality of circular storage grooves are provided along the width direction (X-axis direction), and cylindrical battery cells are stored in these storage grooves.

Meanwhile, a first protrusion 1311 and a second protrusion 1322 are provided on the lower edge of the outer surface of the first holder 1310, and a first through hole ( 1312) and a second through hole 1322 are respectively formed, which will be described later.

Meanwhile, one side of the bus bar 1400 is in close contact with the side of the battery holder 1300, while the other side is connected to the first cable portion 2100 so that the stored cylindrical battery cells and the first cable portion 2100 can be electrically connected. A more detailed explanation will be provided later.

Next, the cable unit (2000) will be described. The cable unit 2000 is for electrically connecting the battery modules 1000 to each other or for communication with a device, and includes a first cable unit 2100, a second cable unit 2200, a third cable unit 2300, and a third cable unit 2300. It may be composed of 4 cable parts 2400.

Specifically, the first cable unit 2100 electrically connects a pair of battery modules 1000 to each other, and the second cable unit 2200 has one side connected to one battery module 1000 and the other side connected to each other. It may be a positive cable connected to the terminal 3000.

The third cable portion 2300 may be a negative cable with one side connected to the remaining battery module 1000 and the other side connected to the connection terminal 3000.

Of course, it is obvious that when the second cable part 2200 is a negative cable, the third cable part 2300 is a positive cable.

Meanwhile, the fourth cable unit 2400 is a cable for wireless communication and can transmit various information about the battery pack. For example, when the battery pack according to the present invention is mounted on a robot, it is possible to wirelessly transmit the status of the battery pack to a user at a distance and, if necessary, receive a signal to control the battery pack, and such wireless Transmission, reception and control can be implemented through known technologies, so detailed descriptions will be omitted.

As described above, the connection terminal 3000, where one side of the second cable part 2200 and the third cable part 2300 corresponding to the positive and negative poles are connected, is connected to the power receiving terminal (not shown) of the device, Through this, the device receives power and operates.

The battery pack having the above configuration has an external appearance in which a pair of battery modules 1000 are arranged in a left-right symmetrical structure, and a cable portion 2000 and a connection terminal 3000 are provided between the battery modules 1000. Therefore, it is advantageous to be mounted on a robot made in the shape of a human, but there is no particular limitation as long as the device has a symmetrical structure.

Figure 5 is a perspective view and front view of the bus bar, Figure 6 is an enlarged perspective view of part 'A' in Figure 3, Figure 7 is an exploded perspective view of Figure 6, and Figure 8 is a front view of Figure 6.

Referring to FIGS. 5 to 8, the connection structure of the bus bar 1400 and the first cable portion 2100 will be described. A portion of the bus bar 1400 mounted on the battery module 1000 of the present invention is located on one side of the battery holder 1300, while the remaining portion protrudes out of one side of the battery holder 1300.

This bus bar 1400 is shaped like a plurality of areas such as the first area 1410, the second area 1420, the third area 1430, and the fourth area 1440. For understanding, four areas are connected. Although it is divided into areas, it corresponds to one unit part.

Specifically, the first area 1410 is located in the height direction (Y-axis direction) with respect to one side of the battery holder 1300, and the second area 1420 is located in the width direction (X-axis direction) from the bottom of the first area 1410. direction) and the other end is preferably extended to the outside of the edge of one side of the battery holder 1300.

The third area 1430 is a plate-shaped structure extending a predetermined length from one end of the second area 1420 in the longitudinal direction (Z-axis direction), and forms an approximately right angle with the second area 1420. In addition, the fourth region 1440 has a plate-shaped structure extending in the width direction (X-axis direction) from the upper end of the third region 1430, and is stable and fastened to the cable portion 2100 and prevents the flatness at the fastened position from being distorted. To prevent this, it is best to position it parallel to the bottom of the lower case or the bottom of the battery holder 1300.

The bus bar 1400 having the above structure is fixed with two axes in close contact with one side of the battery holder 1300.

For example, the first area 1410 is located along the height direction (Y-axis direction) of the battery holder 1300, while the second area 1420 is located along the width direction (X-axis direction), and the first area 1420 is located along the width direction (X-axis direction). A first fastening hole 1411 is formed in the area 1410, and a pair of second fastening holes 1421 and a third fastening hole 1422 are formed in the second area 1420 at a predetermined interval.

In addition, the first bolt 1510, the second bolt 1520, and the third bolt 1530 penetrate through the first fastening hole 1411, the second fastening hole 1421, and the third fastening hole 1422, respectively. Afterwards, since it is fixed to one side of the battery holder 1300, the movement of the bus bar 1400 in the height direction (Y-axis direction) and the width direction (X-axis direction) is completely restricted.

The fourth region 1440, which is not in contact with the battery holder 1300, is connected to the cable portion 2100, and for this purpose, a fourth fastening hole 1441 is formed in the center of the fourth region 1440.

Meanwhile, the cable unit 2100 consists of a first cable 2110 having a predetermined length and a pair of connection parts 2120 that are fixed to both ends of the first cable 2110 and can be connected to the fourth area 1440. . Of course, these connection portions 2120 are connected to the fourth region 1440 of the bus bar provided in each of the aforementioned pair of battery modules.

Here, the connection part 2120 may be composed of a first connection member 2121 fixed to the end of the first cable 2110 and a plate-shaped second connection member 2122 located parallel to the bottom surface of the lower case. At this time, a third through hole 2122' is provided in the center of the second connecting member 2122 so that the fourth bolt 1540 can pass through.

Therefore, with the connection part 2120 of the first cable 2110 located on the upper surface of the fourth area 1440 of the bus bar, the fourth bolt 1540 is connected to the third through hole 2122' of the second connection member 2122. ) and the fourth fastening hole 1441 of the fourth area 1440 sequentially, and can be securely fixed by a male and female screw fastening method through the nut 1560 on the lower surface of the fourth area 1440.

Here, the nut 1560 may be a nut having a polygonal shape, for example, a square, hexagon, or octagon.

Figure 9 is a view of the inside of the lower case of the battery module, Figure 10 is an enlarged view of part 'B' of Figure 9, Figure 11 is a cross-sectional view of part 'B' of Figure 9 cut along the XY plane, and Figure 12 is a bus bar and This is a cross-sectional view with the first cable connected.

As described above, the lower case 1100 is provided with a space portion to accommodate the lower portion of the battery holder 1300. Additionally, a receiving groove 1110 is provided near the edge of the lower case 1100, while a plurality of fastening grooves 1120 are provided along the edge.

Here, the receiving groove 1110 is a space that accommodates the nut 1560 fastened to fix the bus bar 1400 and the first cable 2110 to each other.

And the plurality of fastening grooves 1120 are configured to fix the battery holder 1300 to the lower case 1100. Specifically, as shown in FIG. 7, a first through hole is formed on the lower outer surface of the first holder 1310. A first protrusion 1311 with 1312 formed in the center is provided, and a second protrusion 1321 with a second through hole 1322 formed in the center is formed on the lower outer surface of the second holder 1320.

In addition, the fifth bolt 1550 is inserted into the first through hole 1312 and the second through hole 1322 and then fastened to the fastening groove 1120 of the lower case 1100, so that the battery holder 1300 is attached to the lower case. It is firmly fixed at (1100).

Here, the fastening groove 1120 may be a nut with a female thread formed so as to be screwed with the fifth bolt 1550, and is preferably integrated with the lower case 1100 by an insert injection method.

Meanwhile, the receiving groove 1110 for accommodating the nut 1560 fastened to the fourth bolt 1540 may be composed of a first receiving groove 1111, a support jaw 1112, and a second receiving groove 1113. there is.

More specifically, it is preferable that the first receiving groove 1111, which has the same external shape as the nut 1560, has a first receiving groove height (H1) greater than or equal to the nut height (H3) so that it can completely surround the side of the nut 1560, It is more preferable that the first receiving groove width (W1) is larger than the nut width (W2), and most preferably, it is 0.6 to 2 mm larger than the nut width (W2).

The support jaw 1112 extends inward from the first receiving groove 1111 to support the bottom edge of the nut 1560.

And the second receiving groove 1113 has the same external shape as the body portion 1542 of the fourth bolt 1540, extends downward from the support jaw 1112, and the second receiving groove diameter D1 is equal to the fourth receiving groove 1113. It is preferable that it is larger than the bolt body diameter (D2), and it is more preferable that it is 0.6 to 2 mm larger than the fourth bolt body diameter (D2). Also, the height of the second receiving groove height (H2) is not particularly limited, but is preferably about 3 to 10 mm.

As previously described with reference to FIGS. 5 to 8, in the battery module of the present invention, the battery holder 1300 and the first cable 2110 are electrically connected by a bus bar 1400 having the structure described above, At this time, it is fixed along two axes, i.e., the height direction (Y-axis direction) and the width direction (X-axis direction) based on the battery holder 1300.

In addition, the battery holder 1300 is fixed to the lower case 1100. At this time, the fifth bolt 1550 for fixing is fastened to the fastening groove 1120 of the lower case 1100 integrated by the insert injection method, The battery holder 1300 has the advantage of being securely fixed to the lower case 1100.

Meanwhile, when manufacturing the bus bar 1400, including the battery holder 1300, tolerances may occur where the positions of each fastening hole are slightly misaligned. However, unlike the fifth bolt 1550, the fourth bolt 1540 is connected to the fourth region 1440 of the bus bar 1400 and the second region of the first cable 2110 by a nut 1560 that is not fixed to the lower case. Since the connecting member 2122 is fastened, fastening is possible even if some tolerance occurs.

In addition, an accommodating groove 1110 including a first accommodating groove 1111 and a support jaw 1112 that is the same as the outer shape of the nut 1560 and is slightly larger than the nut width and nut height is provided in the lower case 1100, so that the bus Even if the nut 1560 deviates from the designated position due to the tolerance of the bar 1400, the nut 1560 can be accommodated, and the loosening of the nut 1560 from the fourth bolt 1540 is minimized and further prevents the nut 1560 from being lost. can do.

In addition, the receiving groove 1110 is further provided with a second receiving groove 1113 that has the same outer shape as the body portion 1542 of the fourth bolt 1540 and is larger than the fourth bolt body diameter D2 and has a predetermined height. Therefore, it is possible to accommodate even if there is some deviation in the length of the fourth bolts 1540.

Those of ordinary skill in the field to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

1000: Battery module
1100: lower case
1110: Acceptance home
1111: first receiving groove 1112: support jaw
1113: Second receiving groove
1120: Fastening groove
1200: Upper case
1300: Battery holder
1310: first holder
1311: first protrusion 1312: first through hole
1320: second holder
1321: second protrusion 1322: second through hole
1400: bus bar
1410: first area 1411: first fastening hole
1420: Second area 1421: Second fastening hole
1422: Third fastening hole
1430: Third Area
1440: Fourth area 1441: Fourth fastening hole
1500: fastening member
1510: first bolt 1520: second bolt
1530: 3rd bolt
1540: 4th bolt
1541: head 1542: body
1550: 5th bolt
1560: Nut
2000: Cable Department
2100: 1st cable part
2110: first cable
2120: Connection 2121: First connection member
2122: Second connecting member 2122´: Third through hole
2200: 2nd cable part
2300: Third cable section
2400: 4th cable section
3000: connection terminal
W1: Width of the first receiving groove
W2: nut width
D1: Second receiving groove diameter
D2: 4th bolt body diameter
H1: Height of first receiving groove
H2: Height of the second receiving groove
H3: Nut height

Claims (13)

A lower case provided with a space portion;
an upper case located above the lower case;
a battery holder stored in the lower case and the upper case and fixing a plurality of cylindrical battery cells; and
A bus bar on one side is connected to the battery holder and on the other side is electrically connected to the cable portion,
The bus bar includes a first region located in the height direction with respect to one side of the battery holder, a second region extending in the width direction from a bottom of the first region, and a plate shape extending in the longitudinal direction from one end of the second region. a third region, and a fourth plate-shaped region extending in the width direction from the upper end of the third region to be positioned parallel to the bottom surface of the lower case and provided with a fourth fastening hole for fixing the cable portion. composed,
The first and second regions are in close contact with one side of the battery holder, and the third and fourth regions are positioned to protrude outside one side of the battery holder.
According to paragraph 1,
A first fastening hole is provided in the first area, and a third fastening hole is provided in the second area. A first bolt penetrates the first fastening hole and a third bolt penetrates the third fastening hole, so that the bus bar is provided with the first fastening hole. A battery module characterized in that it is fixed to one side of the battery holder.
According to paragraph 2,
The cable portion includes a first cable and a connection portion connected to the fourth region while being fixed to one end of the first cable,
The connection part consists of a first connection member fixed to one end of the first cable, and a plate-shaped second connection member extending parallel to the bottom surface of the lower case from the connection member and having a third through hole through which a bolt passes. become,
The second connecting member is in close contact with the upper surface of the fourth area and is fixed by a fourth bolt and nut.
According to paragraph 3,
The fourth bolt is located on the upper surface of the second connecting member, and the nut is a polygonal nut located on the lower surface of the fourth region.
According to paragraph 4,
A battery module, characterized in that the bottom of the lower case is provided with a receiving groove for accommodating the nut and the body portion of the fourth bolt.
According to clause 5,
The receiving groove is a battery module, characterized in that it is composed of a first receiving groove, a support jaw extending inward from the first receiving groove, and a second receiving groove extending downward from the support jaw.
According to clause 6,
The first receiving groove has the same external shape as the nut, but the first receiving groove width is larger than the nut width,
A battery module characterized in that the second receiving groove diameter is larger than the fourth bolt body diameter.
According to clause 6,
A battery module characterized in that the height of the first receiving groove is greater than or equal to the height of the nut.
According to paragraph 1,
The outer surface of the battery holder is provided with one or more through holes through which the fifth bolt passes, and the bottom surface of the lower case is provided with a fastening groove made of a nut by insert injection to secure the fifth bolt. Battery module.
A battery pack comprising the battery module according to any one of claims 1 to 9.
According to clause 10,
The battery pack includes a pair of battery modules positioned at a predetermined distance apart;
A plurality of cable units; and
A battery pack comprising a connection terminal connected to the device.
According to clause 11,
The cable part includes a first cable part that electrically connects a pair of battery modules, a second cable part where one side is connected to one battery module and the other side is connected to the connection terminal, and one side is connected to the remaining battery module. A battery pack characterized in that it includes a third cable portion connected to the connection terminal and the other side connected to the connection terminal.
According to clause 11,
A battery pack wherein the device is a robot.

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