BMS Assembly

Abstract

The present invention relates to a BMS assembly, which includes: a circuit board having first fastening holes for grounding; a first casing mold that houses the circuit board and includes a bushing portion formed inside a second fastening hole that is recessed from the outside; and a fastening unit that passes through the first and second fastening holes and applies pressure to an upper surface of the bushing portion to bring the circuit board and the bushing portion into contact, wherein the bushing portion includes a vertical portion formed in a direction parallel to the second fastening hole and a horizontal portion formed at an end of the vertical portion and extending in a direction perpendicular to the direction in which the vertical portion is formed, and the fastening unit is electrically connected to a case that houses a plurality of batteries therein, thereby grounding the circuit board.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0130047, filed October 11, 2022, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a grounding assembly for a circuit board, and more particularly to a BMS assembly that includes a structure for grounding a BMS circuit board. [Background technology]

[0003] PCB (Printed Circuit Board) is an essential component used in almost all electronic equipment. It is a printed circuit board formed by wiring electrical and electronic elements on an insulating plate to connect them in a circuit. PCB has a structure in which conductors and insulators are laminated on a board, and can be equipped with a large number of electrical and electronic components such as semiconductors, capacitors, and resistors. Electrical connections can be made between the installed electrical and electronic components through the electrical wiring circuits printed on the PCB. PCBs can efficiently design electrical wiring, reduce the size of electronic equipment, and improve performance and productivity.

[0004] A large number of electrical and electronic components mounted on a PCB can transmit and receive electrical signals. However, when the volume of electrical signals being transmitted and received increases or when the signals must be processed at high speed, the signal processing speed slows down, causing a decrease in PCB performance. To solve this problem, methods such as increasing the number of PCB layers to expand the device capacity are being used.

[0005] Meanwhile, PCBs contain high-speed digital ICs and high-speed signal traces, and are becoming increasingly complex due to the connection of power and I / O ports. Common-mode currents can occur on PCBs due to high-speed switching currents and discontinuities in signal return current paths. The common-mode currents can be coupled with power and signal lines, becoming a major cause of electromagnetic radiation. Therefore, to reduce the electromagnetic radiation, it is necessary to ground the PCB and reduce the inflow of noise caused by the electromagnetic radiation into the electrical signals transmitted or received by electrical and electronic devices mounted on the PCB.

[0006] In a conventional structure for grounding a PCB board, the fastening unit that fastens and electrically connects the PCB board to other components does not fully pressurize only the bushing unit that electrically connects the PCB and the fastening unit, but presses it together with the case, resulting in a problem that the bushing unit and the PCB board do not come into complete contact, and instead the fastening unit presses the case, which can damage the case. This also weakens the contact force between the bushing part and the circuit board, preventing the circuit board from being grounded, and causing the electrical circuit of the PCB board to not function properly.

[0007] Therefore, there is a need to develop a technology to solve the above problems. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made to solve the above problems, and provides a BMS assembly in which the bushing part fully receives the pressing force of the fastening unit in the BMS assembly, preventing damage to the casing mold, and improving the contact force between the bushing part and the circuit board. [Means for solving the problem]

[0009] According to one embodiment of the present invention, the present invention relates to a BMS (Battery Management System) assembly, including: a circuit board having a first fastening hole formed therein for grounding; a first casing mold that accommodates the circuit board and includes a bushing portion formed inside a second fastening hole formed indented from the outside; and a fastening unit that passes through the first and second fastening holes and presses an upper surface of the bushing portion to bring the circuit board and the bushing portion into contact, wherein the bushing portion includes a vertical portion formed in a direction parallel to the second fastening hole and a horizontal portion formed at an end of the vertical portion in a direction perpendicular to the direction in which the vertical portion is formed, and the fastening unit is electrically connected to a case that accommodates a plurality of batteries therein, thereby grounding the circuit board.

[0010] The bushing portion may also include an electrically conductive metal material.

[0011] The vertical portion may be formed around an inner lower end of the second fastening hole, and the horizontal portion may be formed at an upper end of the vertical portion.

[0012] In addition, the fastening unit may contact an upper surface of the horizontal portion and apply pressure downward, and the horizontal portion may be extended to be wider than an area where the fastening unit and the upper surface of the horizontal portion contact each other.

[0013] At least a portion of the lower surface of the horizontal portion may be exposed so as to face the circuit board.

[0014] In addition, the horizontal portion may form a step at the second fastening hole.

[0015] The fastening unit may include a bolt and a nut, the bolt may pass through the first fastening hole and the second fastening hole, and the nut may be coupled with the bolt to apply pressure to an upper surface of the bushing portion.

[0016] The device may further include a second casing mold that accommodates the circuit board and has a third fastening hole formed in a lower portion of the circuit board through which the fastening unit passes.

[0017] The housing may further include a leg unit that supports a lower portion of the second casing mold, has a fourth fastening hole through which the fastening unit passes, and is in contact with and electrically connected to the fastening unit.

[0018] The leg unit may also include an electrically conductive metal material.

[0019] The leg unit may also include a mounting portion on which the second casing mold is placed, and a plurality of legs that are bent downward from the mounting portion and have ends that are connected to the battery module case or the battery pack case.

[0020] The connector may further include a connector disposed between the horizontal portion and the circuit board, one end of which contacts the lower surface of the horizontal portion and the other end of which contacts the upper surface of the circuit board, electrically connecting the bushing portion and the circuit board.

[0021] The connector may also include an electrically conductive metal material.

[0022] The connector may also include a first unit having an opening formed at one end and including an elastically deformable elastic unit therein, and a second unit that is slidable relative to the first unit through the opening and has one end coupled to the elastic unit.

[0023] The elastic unit may be a spring.

[0024] In another embodiment of the present invention, the present invention provides a battery module including: a battery module case accommodating a plurality of batteries; and a BMS (Battery Management system) assembly coupled to the battery module case, wherein the BMS assembly includes: a circuit board having first fastening holes formed therein for grounding; a first casing mold that accommodates the circuit board and includes a bushing portion formed inside a second fastening hole formed by recessing from the outside; and a fastening unit that passes through the first fastening hole and the second fastening hole and applies pressure to an upper surface of the bushing portion to bring the circuit board into contact with the bushing portion, wherein the bushing portion includes a vertical portion formed in a direction parallel to the second fastening hole and a horizontal portion formed at an end of the vertical portion in a direction perpendicular to the direction in which the vertical portion is formed, and the fastening unit is electrically connected to the battery module case to ground the circuit board.

[0025] In yet another embodiment of the present invention, the present invention provides a battery pack including: a battery pack case accommodating a plurality of battery modules, each accommodating a plurality of secondary batteries; and a BMS (Battery Management system) assembly coupled to the battery pack case, wherein the BMS assembly includes: a circuit board having a first fastening hole formed therein for grounding; a first casing mold that accommodates the circuit board and includes a bushing portion formed inside a second fastening hole formed by recessing from the outside; and a fastening unit that passes through the first fastening hole and the second fastening hole and presses an upper surface of the bushing portion to bring the circuit board into contact with the bushing portion, wherein the bushing portion includes a vertical portion formed in a direction parallel to the second fastening hole and a horizontal portion formed at an end of the vertical portion in a direction perpendicular to the direction in which the vertical portion is formed, and the fastening unit is electrically connected to the battery pack case to ground the circuit board. [Effects of the Invention]

[0026] In the present invention, one of the corners of a circuit board is formed asymmetrically relative to the other corners, and in the assembly process of assembling electronic components on the circuit board, it is possible to intuitively determine whether the arrangement direction of the circuit board is correct or not based on the position of the corner of the asymmetric part, and it is possible to prevent electronic components from being assembled in the wrong direction due to an error in the arrangement of the circuit board during the assembly process.

[0027] In addition, the present invention can improve the efficiency of the assembly process by simultaneously fixing the circuit board to the guide case to which the circuit board is coupled and grounding the circuit board, which facilitates the assembly of electronic components on the circuit board. Furthermore, since the ground pattern is formed over a large area in the asymmetric portion of the circuit board, the contact area with the guide unit is increased, thereby improving the grounding function. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a perspective view showing the appearance of a BMS assembly of the present invention. [Figure 2] 2 is a cross-sectional view of the BMS assembly of FIG. 1 taken along line A-A', with the fastening unit removed to show the first, second, third, and fourth fastening holes. [Figure 3] 2 is a cross-sectional view of the BMS assembly in FIG. 1 taken along line A-A'. [Figure 4] 1 is a perspective view of a bushing portion of the present invention. [Figure 5] FIG. 4 is a cross-sectional view specifically showing part B of FIG. 3, in which a connector is added between the circuit board and the bushing portion. [Figure 6] 1(a) and 1(b) are a perspective view and a cross-sectional view, respectively, of a connector according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029]

[0033] The present invention will now be described in detail with reference to the accompanying drawings, in which preferred embodiments of the present invention can be easily implemented by those skilled in the art. However, the present invention may be embodied in various different forms and is not limited to the following embodiments.

[0030] In order to clearly explain the present invention, detailed descriptions of parts that are not relevant to the explanation or related known technologies that may unnecessarily obscure the gist of the present invention will be omitted, and when adding reference symbols to components in each drawing in this specification, the same or similar reference symbols will be used for the same or similar components throughout the specification.

[0031] Furthermore, the terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that an inventor can appropriately define the concepts of terms in order to best describe his or her invention.

[0032] 1 to 3, a BMS assembly 10 according to the present invention may include a circuit board 100, a first casing mold 200, a fastening unit 300, a second casing mold 500, and a leg unit 600. The BMS assembly 10 may include a structure for grounding the circuit board 100.

[0033] A BMS (Battery Management System) is a system that is connected to a battery pack or a battery module and senses various elements such as the current, voltage, and temperature of the battery housed inside the battery pack or the battery module, and detects the charge level of the battery, when to replace the battery, and any problems that have occurred in the battery, thereby maintaining the battery in an optimal state.

[0034] The circuit board 100 included in the BMS assembly 10 may be, but is not limited to, various types of circuit boards, such as a PCB (Printed Circuit Board), an FPCB (Flexible Printed Circuit Board), an RF-PCB (Rigid-Flexible Printed Circuit Board), or an HDI (High Density Interconnection), and is preferably a PCB circuit board.

[0035] A first fastening hole 110 may be formed on one side of the circuit board 100 .

[0036] Referring to Figures 2 and 3, the first fastening hole 110 can have the fastening unit 300 inserted therein to fasten and fix the circuit board 100 to the first casing mold 200, the second casing mold 500, the leg unit 600, etc.

[0037] The first fastening holes 110 may be electrically connected to a ground plane, ground pad, ground pattern, etc. formed on the circuit board 100 to ground the circuit board 100. When the circuit board 100 is stably grounded, a reference potential of a number of electronic components and electrical circuit patterns mounted on the circuit board 100 can be set, current can be induced to flow as intended by the circuit board designer, and noise can be reduced from entering electrical signals transmitted or received by the electronic components.

[0038] The first casing mold 200 has an internal space formed therein and is disposed on the circuit board 100 to accommodate the circuit board 100 and electronic elements mounted on one surface of the circuit board 100 .

[0039] A second fastening hole 210 may be formed on one side of the first casing mold 200. The second fastening hole 210 may be a hole formed by recessing from the outside of the first casing mold 200 toward the inside.

[0040] A bushing portion 220 may be formed at the inner lower end of the second fastening hole 210 .

[0041] 3 and 4, when the fastening unit 300 applies pressure to fasten the first casing mold 200 and the circuit board 100, the bushing part 220 may be configured to contact the fastening unit 300, receive the pressure of the fastening unit 300, and be supported, and to contact the circuit board 100. The bushing part 220 in contact with the circuit board 100 may be electrically connected to the circuit board 100.

[0042] The bushing portion 220 may include a vertical portion 221 and a horizontal portion 222 .

[0043] The bushing portion 220 may be formed to include an electrically conductive material so as to electrically connect the fastening unit 300 and the circuit board 100. In addition, the bushing portion 220 may be formed to include a metal material having a higher mechanical strength than the material of the second fastening hole 210, such as plastic or polymer resin, so as to be able to withstand the pressure of the fastening unit 300.

[0044] The vertical portion 221 may be formed along the periphery of the inner surface of the inner lower end of the second fastening hole 210 and may be formed in a direction parallel to an imaginary vertical central axis passing through the second fastening hole 210 .

[0045] The lower end of the vertical portion 221 contacts the circuit board 100, and the horizontal portion 222 may be formed at the upper end.

[0046] The inner surface of the vertical portion 221 may be spaced a predetermined distance from the outer surface of the bolt 310 of the fastening unit 300 inserted into the second fastening hole 210 and not make contact with the bolt 310. Therefore, the diameter of the inner surface of the vertical portion 221 may be larger than the diameter of the bolt 310. By not making the inner surface of the vertical portion 221 contact the outer surface of the bolt 310, current is guided to flow in the order of the circuit board 100, the vertical portion 221, the horizontal portion 222, the nut 320, the bolt 310, the leg unit 600, and the battery module case 700, forming a single circuit for grounding and reducing noise inflow. However, if the inner surface of the vertical portion 221 contacts the outer surface of the bolt 310, current may flow in the order of the vertical portion 221 of the circuit board 100, the bolt 310, the leg unit 600, and the battery module case 700, creating an additional circuit for grounding and potentially causing noise problems.

[0047] The horizontal portion 222 may be formed at the end of the upper end of the vertical portion 221 to extend in a direction perpendicular to an imaginary vertical central axis passing through the second fastening hole 210, which is the direction in which the vertical portion 221 is formed. The horizontal portion 222 may form a step in the second fastening hole 210, thereby making the size of the hole larger at the upper end of the second fastening hole 210 than at the lower end of the second fastening hole 210.

[0048] Furthermore, since the material of the horizontal portion 222 is a metal material having greater mechanical strength than the material of the second fastening hole 210, even if the horizontal portion 222 comes into contact with the fastening unit 300 and is fully subjected to the pressing force of the fastening unit 300, damage to the first casing mold 200 can be prevented.

[0049] The shape formed around the edge of horizontal portion 222 may be similar to the cross-sectional shape of vertical portion 221 .

[0050] The horizontal portion 222 may be bent outward from the upper end of the vertical portion 221 to form a radial shape.

[0051] The upper surface of the horizontal portion 222 may be in contact with the lower surface of the nut 320 of the fastening unit 300 and may be a surface that directly receives downward pressure when the nut 320 of the fastening unit 300 is tightened. The area of ​​the upper surface of the horizontal portion 222 may be greater than the contact area between the upper surface of the horizontal portion 222 and the fastening unit 300. The lower surface of the nut 320 may only be in contact with the upper surface of the horizontal portion 222.

[0052] In the longitudinal cross section of the bushing part 220, the length of the horizontal part 222 may be the same as or similar to the length of the vertical part 221. The thickness of the horizontal part 222 may be greater than the thickness of the vertical part 221 so as to better support the pressing force of the nut 320.

[0053] At least a portion of the lower surface of the horizontal portion 222 may be exposed so as to directly face the upper surface of the circuit board 100. A connector 400 may be disposed between the exposed lower surface of the horizontal portion 222 and the upper surface of the circuit board 100 to electrically connect the horizontal portion 222 and the circuit board 100 to each other.

[0054] The outer surface of the vertical portion 221 may be surrounded by the second fastening hole 210 .

[0055] The first casing mold 200 is formed of a material such as a polymer resin or a polymer plastic material, and the bushing portion 220 formed in the second fastening hole 210 is formed of a metal material. Therefore, the first casing mold 200 may be manufactured by an insert injection molding method so that multiple different materials, such as metal and plastic, can be integrated.

[0056] The fastening unit 300 may be a unit for fastening and fixing the circuit board 100, the first casing mold 200, and the second casing mold 500 to one another.

[0057] The fastening unit 300 may include a bolt 310 and a nut 320 , and the nut 320 may be coupled to the bolt 310 .

[0058] The bolt 310 includes a head portion and a body coupled to the head portion, the body being cylindrical with a spiral thread formed around the outer surface, and the nut 320 having a hole communicating between the upper and lower surfaces and a thread groove formed on the inner surface to correspond to the thread formed on the outer surface of the bolt 310 so that the nut 320 can be coupled to the bolt 310. When the nut 320 is coupled to the body of the bolt 310 and rotates in one direction, it moves in the direction in which the head portion is formed along the length of the bolt 310, and when it rotates in the opposite direction, it moves in the opposite direction to the direction in which the head portion is formed along the length of the bolt 310.

[0059] 5, the BMS assembly 10 may further include a connector 400. The connector 400 may be configured to electrically couple the lower surface of the horizontal portion 222 and the upper surface of the circuit board 100.

[0060] The lower end of the vertical portion 221 contacts the circuit board 100, so that the bushing portion 220 and the circuit board 100 can be electrically connected to each other. The connector 400 is disposed between the lower surface of the horizontal portion 222, which is exposed to face the lower surface of the circuit board 100, and the upper surface of the circuit board 100, so that the bushing portion 220 and the circuit board 100 can be electrically connected to each other. One end of the connector 400 may contact the lower surface of the horizontal portion 222 and the other end may contact the upper surface of the circuit board 100.

[0061] Referring to FIG. 6, the connector 400 may include a first unit 410, an elastic unit 420, and a second unit 430.

[0062] The connector 400 may be formed of an electrically conductive metal material so as to electrically connect the bushing portion 220 and the circuit board 100 to each other and to ground the circuit board 100 .

[0063] The shape of the first unit 410 is not limited to this, but may be, for example, a cylindrical pillar, a square pillar, or the like.

[0064] The first unit 410 may have an opening formed at one end thereof, and an internal space communicating with the opening may be formed therein.

[0065] An elastic unit 420 may be coupled to the inner space of the first unit 410 along the length of the first unit 410 .

[0066] The elastic unit 420 may be configured to be elastically deformable, that is, when subjected to an external force, it deforms and when the force is removed, it returns to its original shape by a restoring force. The elastic unit is not limited thereto, but may be, for example, a spring.

[0067] The second unit 430 may be inserted through an opening in the first unit 410 and coupled to the first unit 410. The second unit 430 is formed to have a cross-sectional shape and size corresponding to the shape and size of the opening of the first unit 410, and may be coupled to the first unit 410 and slide relative to the first unit 410 to adjust the length of the connector 400 in the longitudinal direction.

[0068] Since one end of the second unit 430 is connected to the elastic unit 420 of the first unit 410, when the second unit 430 moves in a direction approaching the first unit 410, it pushes against the elastic unit 420 of the second unit 430, causing the elastic unit 420 to be compressed and deformed, and the elastic unit 420 can apply an elastic force in the opposite direction to the movement direction of the second unit 430.

[0069] The other end of the second unit 430 can contact the lower surface of the horizontal portion 222 or the upper surface of the circuit board 100 .

[0070] The basic length of the connector 400 in the longitudinal direction, which is formed when the second unit 430 does not press and compress the elastic unit 420, may be longer than the vertical distance between the lower surface of the horizontal part 222 and the upper surface of the circuit board 100. The connector 400 may be fixed in position in the space between the lower surface of the horizontal part 222 and the upper surface of the circuit board 100 by the elastic force caused by the compressive deformation of the elastic unit 420, with the first unit 410 and the second unit 430 contacting the lower surface of the horizontal part 222 and the upper surface of the circuit board 100.

[0071] When the nut 320 is rotated in one direction to apply more pressure to the bushing portion 220, the distance between the horizontal portion 222 and the circuit board 100 can become narrower, and the connector 400 located between the horizontal portion 222 and the circuit board 100 can also be adjusted to correspond to the changing distance between the horizontal portion 222 and the circuit board 100.

[0072] The second casing mold 500 is disposed below the circuit board 100 and can accommodate the circuit board 100 in an internal space together with the first casing mold 200 .

[0073] The first casing mold 200 and the second casing mold 500 can be fastened together by the fastening unit 300, and the first casing mold 200 and the second casing mold 500 can be fastened together to form an internal space, in which the circuit board 100 is placed, and the first casing mold 200 and the second casing mold 500 can protect the circuit board 100 placed inside.

[0074] Referring to FIGS. 2 and 3, a third fastening hole 510 may be formed on one side of the second casing mold 500 .

[0075] The first fastening hole 110, the second fastening hole 210 and the third fastening hole 510 may be arranged so that imaginary vertical central axes passing through the respective fastening holes 110, 210 and 510 coincide with each other so that the bolt 310 of the fastening unit 300 can be inserted therein.

[0076] The second casing mold 500 can be manufactured by injection molding using materials such as synthetic resin and plastic.

[0077] A leg unit 600 may be disposed below the second casing mold 500 to support the second casing mold 500 and to be fastened to the second casing mold 500 via the fastening unit 300 .

[0078] Referring to Figures 2 and 3, the leg unit 600 may have a fourth fastening hole 610 formed on one surface so that the fastening unit 300 can be inserted and fastened to the second casing mold 500.

[0079] The fourth fastening hole 610 may be arranged so that its virtual vertical central axis coincides with the first fastening hole 110, the second fastening hole 210, and the third fastening hole 510 so that the bolt 310 of the fastening unit 300 can be inserted therein.

[0080] The bolt 310 passes through the fourth fastening hole 610 and is coupled with the nut 320 so that the head of the bolt 310 can press the leg unit 600 on the lower surface of the leg unit 600 .

[0081] The leg unit 600 may include a mounting portion 620 and a leg portion 630 .

[0082] The mounting portion 620 is formed on the upper surface of the leg unit 600, and the second casing mold 500 can be mounted thereon. When the second casing mold 500 is mounted on the mounting portion 620, the fourth fastening hole 610 and the third fastening hole 510 may be arranged such that the vertical central axes passing through the respective fastening holes 510, 610 are aligned so that the fastening unit 300 can fasten the leg unit 600 and the second casing mold 500 together.

[0083] The leg portion 630 may be bent downward from the end of the mounting portion 620 in a direction away from the second casing mold 500 mounted on the mounting portion 620 .

[0084] The leg 630 may be coupled such that its end contacts the battery module or the battery module case 700. When the leg 630 is coupled to the battery module or the battery pack case 700, the upper surface of the circuit board 100 is electrically connected to the bushing part 220, the fastening unit 300, and the leg unit 600 in sequence, and may ultimately be grounded to the battery module case 700.

[0085] The leg unit 600 may be formed to include an electrically conductive metal material so that it can be fastened to the bolt 310 of the fastening unit 300 and electrically connected thereto.

[0086] Battery Module The battery module may include a battery module case 700 and a BMS assembly 10. The battery module case 700 may accommodate a plurality of batteries in its internal space. The batteries may be provided in various shapes, such as a pouch shape, a cylindrical shape, or a square shape. The battery module case 700 may have any shape and may include an electrically conductive metal material. The leg unit 600 of the BMS assembly 10 may be coupled to one side of the battery module case 700, and the circuit board 100 may be electrically connected in sequence to the vertical portion 221, the horizontal portion 222, the nut 320, the bolt 310, the leg unit 600, and the battery module case 700, thereby being stably grounded. Specific details regarding the BMS assembly 10 may be substituted for those described above.

[0087] Battery pack The battery pack may include a battery pack case (not shown) and a BMS assembly 10. The battery pack accommodates a plurality of battery modules in its internal space, and the battery modules may accommodate a plurality of batteries. The batteries may be provided in various shapes, such as a pouch shape, a cylindrical shape, or a rectangular shape. The battery pack case is not limited in shape and may include an electrically conductive metal material. The leg unit 600 of the BMS assembly 10 may be coupled to any one side of the battery pack case, and the circuit board 100 may be electrically connected in sequence to the vertical portion 221, the horizontal portion 222, the nut 320, the bolt 310, the leg unit 600, and the battery pack case, thereby being stably grounded. Specific details regarding the BMS assembly 10 may be substituted for those described above.

[0088] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the technical spirit of the present invention and the equivalent scope of the claims set forth below by a person having ordinary skill in the art to which the present invention pertains. [Explanation of symbols]

[0089] 10: BMS assembly 100: Circuit board 110: 1st fastening hole 200: First casing mold 210:Second fastening hole 220: Bushing part 221: Vertical section 222:Horizontal part 300: Fastening unit 310: Bolt 320: Nut 400: Connector 410: 1st Unit 420: Elastic unit 430: Second Unit 500: Second casing mold 510: 3rd fastening hole 600: Leg unit 610: 4th fastening hole 620: Placement section 630: Legs 700: Battery module case

Claims

1. 1. A BMS assembly comprising: a circuit board having a first fastening hole for grounding; a first casing mold that accommodates the circuit board and includes a bushing portion formed inside a second fastening hole that is recessed from the outside; a fastening unit that passes through the first fastening hole and the second fastening hole and presses an upper surface of the bushing portion to bring the circuit board and the bushing portion into contact with each other, The bushing portion is a vertical portion formed in a direction parallel to the second fastening hole; a horizontal portion formed at an end of the vertical portion and extending in a direction perpendicular to the direction in which the vertical portion is formed, The fastening unit is electrically connected to a case that houses a plurality of batteries therein, thereby grounding the circuit board.

2. The BMS assembly of claim 1 , wherein the bushing portion comprises an electrically conductive metallic material.

3. The vertical portion is formed along the periphery of the inner lower end of the second fastening hole, The BMS assembly of claim 1 , wherein the horizontal portion is formed at an upper end of the vertical portion.

4. The fastening unit contacts the upper surface of the horizontal portion and applies pressure downward, The BMS assembly according to claim 1 , wherein the horizontal portion extends wider than an area where the fastening unit contacts an upper surface of the horizontal portion.

5. The BMS assembly according to claim 4 , wherein at least a portion of a lower surface of the horizontal portion is exposed so as to face the circuit board.

6. The BMS assembly of claim 5 , wherein the horizontal portion forms a step in the second fastening hole.

7. The fastening unit includes a bolt and a nut, The bolt passes through the first fastening hole and the second fastening hole, The BMS assembly of claim 1 , wherein the nut engages the bolt and applies pressure to an upper surface of the bushing portion.

8. The BMS assembly of claim 1 , further comprising a second casing mold that accommodates the circuit board, the second casing mold having a third fastening hole formed in a lower portion of the circuit board and through which the fastening unit passes.

9. 10. The BMS assembly of claim 8, further comprising: a leg unit that supports a lower portion of the second casing mold, has a fourth fastening hole formed therein through which the fastening unit passes, and is in contact with and electrically connected to the fastening unit.

10. The BMS assembly of claim 9 , wherein the leg unit comprises an electrically conductive metallic material.

11. The leg unit is a placement portion on which the second casing mold is placed; The BMS assembly according to claim 9 , comprising a plurality of legs bent downward from the mounting portion, the ends of which are coupled to a battery module case or a battery pack case.

12. 2. The BMS assembly of claim 1, further comprising: a connector disposed between the horizontal portion and the circuit board, one end of the connector contacting a lower surface of the horizontal portion and the other end of the connector contacting an upper surface of the circuit board, the connector electrically connecting the bushing portion and the circuit board.

13. The BMS assembly of claim 12 , wherein the connector comprises an electrically conductive metallic material.

14. The connector comprises: a first unit having an opening at one end and including an elastic unit capable of elastic deformation therein; The BMS assembly of claim 12 , including a second unit slidable relative to the first unit through the opening, one end of the second unit coupled to the elastic unit.

15. The BMS assembly of claim 14, wherein the elastic unit is a spring.

16. a battery module case housing a plurality of batteries; a BMS assembly coupled to the battery module case, The BMS assembly includes: a circuit board having a first fastening hole for grounding; a first casing mold that accommodates the circuit board and includes a bushing portion formed inside a second fastening hole that is recessed from the outside; a fastening unit that passes through the first fastening hole and the second fastening hole and presses an upper surface of the bushing portion to bring the circuit board into contact with the bushing portion, The bushing portion is a vertical portion formed in a direction parallel to the second fastening hole; a horizontal portion formed at an end of the vertical portion and extending in a direction perpendicular to the direction in which the vertical portion is formed, The fastening unit is electrically connected to the battery module case to ground the circuit board.

17. a battery pack case accommodating a plurality of battery modules, each of which accommodates a plurality of secondary batteries; a BMS assembly coupled to the battery pack case, The BMS assembly includes: a circuit board having a first fastening hole for grounding; a first casing mold that accommodates the circuit board and includes a bushing portion formed inside a second fastening hole that is recessed from the outside; a fastening unit that passes through the first fastening hole and the second fastening hole and presses an upper surface of the bushing portion to bring the circuit board into contact with the bushing portion, The bushing portion is a vertical portion formed in a direction parallel to the second fastening hole; a horizontal portion formed at an end of the vertical portion and extending in a direction perpendicular to the direction in which the vertical portion is formed, The fastening unit is electrically connected to the battery pack case to ground the circuit board.

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