Secondary battery module

Abstract

The present invention relates to a secondary battery module, and more particularly, provides a secondary battery module comprising: a plurality of secondary batteries each having a first electrode lead formed on one side thereof; a module case accommodating the plurality of secondary batteries and having a plurality of slit holes formed in one surface thereof, the first electrode lead passing through the plurality of slit holes; a sensing circuit board mounted in the module housing and having a first pad portion formed on a surface thereof and plated with a conductive metal; a first plate bonded to the first pad portion; and a first wire connection portion connecting the first electrode lead to the first plate through a wire.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Korean Patent Application No. 10-2022-0181893, filed on December 22, 2022, which is hereby incorporated by reference in its entirety. Technical Field

[0003] The present invention relates to a secondary battery module, and more particularly, to a secondary battery module in which electrode leads of a secondary battery are connected to a sensing circuit board through a wire. Background Art

[0004] Recently, due to the development of alternative energy sources to combat air pollution and energy depletion caused by the use of fossil fuels, the demand for secondary batteries capable of storing generated electrical energy is increasing. Rechargeable and dischargeable secondary batteries are used extensively in daily life, in addition to mobile devices, electric vehicles, and hybrid vehicles.

[0005] The capacity of secondary batteries, used as energy sources for various electronic devices in modern society, is increasing due to the increased use and sophistication of mobile devices and the development of electric vehicles. Multiple secondary batteries are being installed in small devices to meet user needs, but secondary battery modules that electrically connect multiple secondary batteries or secondary battery packs equipped with multiple secondary battery modules are used in vehicles and the like.

[0006] Such secondary batteries may have parallel and / or series electrical connections within the secondary battery module. Here, the electrical connection between the secondary batteries is generally configured by providing a bus bar assembly in the secondary battery module and joining the electrode leads of the secondary battery to the bus bar. Here, since the bus bar is connected to the interconnection board, and the interconnection board is connected to the cell monitoring controller (CMC) circuit board, there is a problem that the structure of the secondary battery module becomes complicated. In addition, the flexible printed circuit board (FPCB) and the printed circuit board (PCB) for electrical connection to the secondary battery are configured to electrically connect the bus bar joined to the secondary battery to the secondary battery through a separate connector. Therefore, there are problems of an increase in the number of components, an increase in volume, and a complicated structure. Summary of the Invention

[0007] Technical issues

[0008] The present invention has been invented to solve the above-mentioned problems, and an object of the present invention is to provide a secondary battery module in which bus bars and interconnection plates are removed to simplify its structure and reduce its volume.

[0009] Technical Solution

[0010] According to a first embodiment of the present invention, the present invention provides a secondary battery module, which includes: a plurality of secondary batteries, the plurality of secondary batteries including a first electrode lead arranged on one side thereof; a module shell, the module shell being configured to accommodate the plurality of secondary batteries, and the first electrode lead passing through the module shell through a plurality of slit holes defined in a surface of the module shell; a sensing circuit board, the sensing circuit board being mounted on the module shell, and a first solder pad portion plated with a conductive metal being provided on the surface of the sensing circuit board; a first plate, the first plate being joined to the first solder pad portion; and a first wire connection portion, the first wire connection portion being configured to connect the first plate to the first electrode lead via a wire.

[0011] The first plate may include a nickel (Ni) material.

[0012] The first plates may be joined by a welding process.

[0013] The plurality of slit holes may include a first slit hole and a second slit hole respectively defined on both sides of the first plate, and the first electrode lead passing through the first slit hole and the second electrode lead passing through the second slit hole may be folded toward each other to overlap each other, and the overlapping first electrode leads may be joined to each other.

[0014] The first wire connection portion may be configured to connect a first electrode lead disposed at an outermost surface of the bonded first electrode lead to the first plate through the wire.

[0015] The sensing circuit board may be configured to sense a voltage of each of the secondary batteries.

[0016] The secondary battery module may further include: a flexible circuit board mounted on the other surface of the module housing and having a second pad portion plated with a conductive metal provided on the surface of the flexible circuit board; a second plate bonded to the second pad portion; and a second wire connection portion configured to connect a second electrode lead provided on the other side of the secondary battery to the second plate through a wire.

[0017] A first lead hole and a second lead hole can be defined on both sides of the second plate on the other surface of the module housing, respectively, and the second electrode lead passing through the first lead hole and the first electrode lead passing through the second lead hole can be folded toward each other to overlap each other, and the overlapping second electrode leads can be joined to each other.

[0018] The second wire connection portion may be configured to connect the second electrode lead disposed at the outermost surface of the bonded second electrode lead to the second plate through the wire.

[0019] The secondary battery module may further include a connector configured to electrically connect the sensing circuit board to the flexible circuit board.

[0020] The connector may include a first connection unit coupled to the sensing circuit board, a second connection unit coupled to the flexible circuit board, and a cable configured to connect the first connection unit to the second connection unit.

[0021] According to a second embodiment of the present invention, the present invention provides a secondary battery pack, which includes: a plurality of secondary battery modules; and a battery pack shell, the battery pack shell being configured to accommodate the plurality of secondary battery modules, wherein each of the plurality of secondary battery modules includes: a plurality of secondary batteries, the plurality of secondary batteries including a first electrode lead arranged on one side thereof; a module shell, the module shell being configured to accommodate the plurality of secondary batteries, and the first electrode lead passing through the module shell through a plurality of slit holes defined in a surface of the module shell; a sensing circuit board, the sensing circuit board being mounted on the module shell, and a first solder pad portion plated with a conductive metal being provided on the surface of the sensing circuit board; a first plate, the first plate being joined to the first solder pad portion; and a first wire connection portion, the first wire connection portion being configured to connect the first plate to the first electrode lead via a wire.

[0022] Beneficial effects

[0023] The present invention can be configured such that, since the electrode leads facing each other are folded to overlap each other, the overlapping electrode leads are joined to each other at one time, the positions of the electrode leads are stably fixed to replace the existing bus bars, and since the electrode leads and the sensing circuit board are directly connected to each other through wires to replace the interconnection board (ICB) connected to the bus bars, the structure of the secondary battery module is simplified and the volume of the secondary battery module is reduced. In addition, since the electrode leads and the sensing circuit board of the secondary battery are directly connected to each other through wires without the need for a separate connector cable, the structure of the secondary battery can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view showing one surface of a module case of a secondary battery according to a first embodiment of the present invention, ie, an enlarged view showing a state in which first electrode leads are joined to overlap each other and connected to a first plate through a wire.

[0025] Figure 2 is a perspective view showing another surface of the module case of the secondary battery according to the first embodiment of the present invention, ie, an enlarged view showing a state in which first electrode leads are joined to overlap each other and connected to a second plate through a wire.

[0026] Figure 3 is a cross-sectional view of a sensing circuit board having a configuration in which a first board is bonded according to a first embodiment of the present invention.

[0027] Figure 4 is a cross-sectional view of a flexible circuit board having a configuration in which a second board is bonded according to a first embodiment of the present invention. DETAILED DESCRIPTION

[0028] Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. However, the following drawings are intended to facilitate understanding of the present invention and are merely one embodiment of the present invention. The scope of the present invention is not limited to the scope depicted in the drawings. In addition, in the following drawings, the same symbols refer to the same components, and some components may be exaggerated, reduced, or omitted to facilitate understanding of the present invention.

[0029] Furthermore, the terms or words used in the present specification and claims should not be restrictively interpreted as ordinary meanings or dictionary-based meanings, but should be interpreted as meanings and concepts consistent with the scope of the present invention based on the principle that the inventor can properly define terminology concepts in order to best describe and interpret his or her invention.

[0030] First embodiment

[0031] Reference Figure 1 As one embodiment of the present invention, a secondary battery module 10 of the present invention may include a secondary battery 100 , a module case 200 , a sensing circuit board 300 , a first board 400 , and a first wire connection portion 500 .

[0032] The secondary battery 100 may have a structure in which an electrode assembly (not shown) is housed in a pouch-type battery case, and a first electrode lead 110 protrudes from one side of the battery case, and a second electrode lead 120 protrudes from the other side of the battery case. In other words, the secondary battery 100 may include the first electrode lead 110 disposed on one side and the second electrode lead 120 disposed on the other side.

[0033] The electrode assembly may have a structure in which a positive electrode collector / positive electrode active material layer / separator / negative electrode active material layer / negative electrode collector are stacked in sequence. The uncoated portion of the positive electrode may be used as a positive electrode tab. The negative electrode collector may include a region coated with a negative electrode active material layer and a region not coated with a negative electrode active material, and the uncoated portion of the negative electrode may be used as a negative electrode tab. The separator may be provided between the positive electrode collector and the negative electrode collector to prevent current collectors with different polarities from contacting each other. The first electrode lead 110 may be connected to the uncoated portion of the positive electrode or the uncoated portion of the negative electrode, and the second electrode lead 120 may also be connected to the uncoated portion of the positive electrode or the uncoated portion of the negative electrode.

[0034] The module housing 200 may refer to a frame that defines the appearance of the secondary battery module 10 and may have a storage space therein. A plurality of secondary batteries 100 may be stored in the storage space defined within the module housing 200, and the module housing 200 may surround the stack of the plurality of secondary batteries 100 with inner walls on four sides to stably support the stacked form of the secondary batteries 100.

[0035] The secondary battery 100 accommodated in the module case 200 may be arranged such that the first electrode lead 110 faces a direction in which the slit hole is defined, and the second electrode lead 120 faces a direction in which the lead hole 220 is defined.

[0036] The plurality of secondary batteries 100 accommodated in the accommodation space of the module housing 200 can be stacked in the width direction of the module housing so that the narrow surfaces stand facing the upper and lower sides and the wide surfaces are in contact with each other. Here, the width direction of the module housing 200 may refer to the longitudinal direction of the surface of the module housing 200 on which the sensing circuit board 300 or the flexible circuit board 600 is mounted.

[0037] A plurality of slit holes 210 may be defined in one surface of the module case 200. One surface of the module case 200 may refer to a surface defining the width of the module case 200, or may refer to a surface defined in a direction in which the first electrode lead 110 of the secondary battery 100 is disposed. The other surface of the module case 200 may refer to a surface defined in a direction opposite to the one surface.

[0038] The slit hole 210 may be a hole through which each first electrode lead 110 of the plurality of secondary batteries 100 accommodated in the accommodation space of the module case 200 passes through the module 200 to protrude outside the module case 200 .

[0039] The slit hole 210 may be defined in a longitudinal direction (ie, a vertical direction) so that the first electrode lead 110 passes therethrough, and may have a narrow width.

[0040] The plurality of slit holes 210 may be divided into first slit holes 211 and second slit holes 212 according to their respective positions based on the position of the first plate 400. The first slit holes 211 among the plurality of slit holes may refer to slit holes 210 defined in one direction centered on the position of the first plate 400 and disposed adjacent to the first plate 400. The second slit holes 212 among the plurality of slit holes 210 may refer to slit holes 210 defined in another direction centered on the position of the first plate 400 and disposed adjacent to the first plate 400. In other words, the first slit holes 211 and the second slit holes 212 may be defined on both sides of the first plate 400. Since the first slit holes 211 and the second slit holes 212 are defined on both sides of the first plate 400, the process of bonding the first electrode leads 110 passing through the first slit holes 211 and the second slit holes 212 to each other can be performed at one time, thereby improving the efficiency of the manufacturing process.

[0041] The first electrode lead 110 passing through the first slit hole 211 and the first electrode lead 110 passing through the second slit hole 212 may face each other, and the first electrode lead 110 passing through the first slit hole 211 and the first electrode lead 110 passing through the second slit hole 212 may be folded toward each other to overlap each other, thereby joining together. The plurality of first electrode leads 110 folded to overlap each other may be joined together. More specifically, the plurality of overlapping first electrode leads 110 may be joined together by welding, which is not limited to welding methods but includes, for example, laser welding, resistance welding, ultrasonic welding, spot welding, and the like. The joined first electrode leads 110 can be electrically connected to each other, and their position and folded form can be stably fixed. The first welding portion 111 may be provided on the outermost surfaces of the welded plurality of first electrode leads 110. Thus, the joined first electrode leads 110 can be joined between the first electrode leads 110 to be stably fixed in place, thereby simplifying the structure of the secondary battery module 10 and reducing its volume by replacing existing busbars.

[0042] A plurality of first plates 400 may be provided in the width direction of one surface of the module case 200 , and thus the first slit holes 211 and the second slit holes 212 may also be provided adjacent to both sides of the first plate 400 at each position.

[0043] A plurality of first slit holes 211 and a plurality of second slit holes 212 may be defined on both sides of a first plate 400. Thus, the first electrode leads 110 passing through the plurality of first slit holes 211 and the first electrode leads 110 passing through the plurality of second slit holes 212 may be folded toward each other to overlap each other. The plurality of overlapping first electrode leads 110 may be joined to each other at one time to maximize process efficiency. The plurality of overlapping first electrode leads 110 may be joined to each other by a welding method, and the welding method is not limited thereto, but includes, for example, laser welding, resistance welding, ultrasonic welding, spot welding, and the like.

[0044] A plurality of lead holes 220 may be defined in the other surface of the module case 200. The other surface of the module case 200 may refer to a surface defining the width of the module case 200, or may refer to a surface defined in a direction in which the second electrode lead 120 of the secondary battery 100 is disposed. The other surface of the module case 200 may refer to a surface defined in a direction opposite to the one surface.

[0045] The lead hole 220 may be a hole through which each second electrode lead 120 of the plurality of secondary batteries 100 accommodated in the accommodation space of the module case 200 passes through the module 200 to protrude outside the module case 200. The lead hole 220 may refer to a hole defined in a longitudinal direction (i.e., a vertical direction) so that the second electrode lead 120 passes therethrough, and may have a narrow width.

[0046] The plurality of lead holes 220 may be divided into first lead holes 221 and second lead holes 222 according to their respective positions based on the position of the second plate 410. The first lead holes 221 among the plurality of lead holes 220 may refer to lead holes 220 defined in one direction centered on the position of the second plate 410 and disposed adjacent to the second plate 410. The second lead holes 222 among the plurality of lead holes 220 may refer to lead holes 220 defined in another direction centered on the position of the second plate 410 and disposed adjacent to the second plate 410. In other words, the first lead holes 221 and the second lead holes 222 may be defined on both sides of the second plate 410. Since the first lead holes 221 and the second lead holes 222 are defined on both sides of the second plate 410, the process of joining the second electrode leads 120 passing through the first lead holes 221 and the second lead holes 222 to each other can be performed at one time, thereby improving efficiency.

[0047] The second electrode lead 120 passing through the first lead hole 221 and the second electrode lead 120 passing through the second lead hole 222 may face each other, and the second electrode lead 120 passing through the first lead hole 221 and the second electrode lead 120 passing through the second lead hole 222 may be folded toward each other so as to overlap each other, thereby joining together. The plurality of second electrode leads 120 folded to overlap each other may be joined together. The plurality of overlapping second electrode leads 120 may be joined together by welding, which is not limited to this and includes, for example, laser welding, resistance welding, ultrasonic welding, spot welding, etc. The joined second electrode leads 120 can be electrically connected to each other, and their position and folded form can be stably fixed. The second welding portion 121 may be provided on the outermost surfaces of the welded plurality of second electrode leads 120. Thus, the joined second electrode leads 120 can be joined between the second electrode leads 120, thereby stably fixing them in place, simplifying the structure of the secondary battery module 10 and reducing its volume by replacing existing bus bars.

[0048] A plurality of second plates 410 may be provided in the width direction of the other surface of the module case 200 , and thus the first slit holes 211 and the second slit holes 212 may also be provided adjacent to both sides of the first plate 400 at each position.

[0049] A plurality of first lead holes 221 and a plurality of second lead holes 222 may be defined on both sides of one second plate 410. Thus, the second electrode leads 120 passing through the plurality of first lead holes 221 and the second electrode leads 120 passing through the plurality of second lead holes 222 may be folded toward each other to overlap each other. The plurality of overlapping second electrode leads 120 may be joined to each other at one time to maximize process efficiency. The plurality of overlapping second electrode leads 120 may be joined to each other by a welding method, and the welding method is not limited thereto, but includes, for example, laser welding, resistance welding, ultrasonic welding, spot welding, and the like. The first welding portion 111 may be provided on the outermost surface of the plurality of second electrode leads 120 welded together.

[0050] The sensing circuit board 300 can be mounted on one surface of the module housing 200 to sense the voltage and temperature of the secondary battery 100, thereby transmitting the sensed values to the battery management system (BMS). The sensing circuit board 300 can be a cell monitoring controller (CMC) circuit board. The sensing circuit board 300 can be mounted on one surface of the module housing 200 adjacent to the position where the first electrode lead 110 protrudes through the slit hole 210 to facilitate connection with the first electrode lead 110. In particular, the first pad portion 310 of the sensing circuit board 300 can be arranged adjacent to the overlapping first electrode lead 110 so as to be connected to the first electrode lead 110 through a wire.

[0051] The sensing circuit board 300 may include a first supporting portion 330 supporting the board, a first metal layer 320 defining a circuit of the sensing circuit board 300 over the first supporting portion 330 , and a first pad portion 310 electrically connected to the first metal layer 320 .

[0052] A first pad portion 310 having a predetermined width may be provided on the sensing circuit board 300 so as to be electrically connected to the first electrode lead 110 of the secondary battery 100 .

[0053] The first pad portion 310 may be provided by plating a conductive metal on the surface of the first metal layer so as to be electrically connected to the first metal layer defining the circuit of the sensing circuit board 300. The plated metal is not limited thereto but may be a material such as, for example, gold, silver, copper, aluminum, or tin.

[0054] However, since the first pad portion 310 is not easily bonded to a wire for electrical connection with the first electrode lead 110 , the first plate 400 made of a material favorable for bonding a wire may be bonded to the top surface of the first pad portion 310 .

[0055] The first plate 400 may be provided in a thin plate shape made of a conductive metal material. The first plate 400 may be bonded to the first pad portion 310, and the first plate 400 may be bonded to the first pad portion 310 through a welding process. Therefore, a first welding layer 401 that melts, cools, and solidifies may be provided between the first plate 400 and the first pad portion 310.

[0056] The first plate 400 may be made of a material that is not easily oxidized and has excellent chemical resistance to prevent an oxide film from being formed on the surface, thereby facilitating bonding with the first wire connection portion 500. For example, the first plate 400 may include one or more materials of nickel (Ni), palladium (Pd), gold (Au), and chromium (Cr), and preferably includes nickel or a nickel alloy material in which chromium is added to nickel.

[0057] The first wire connection portion 500 can connect the outer surface of the first electrode lead 110, which is disposed on the outermost surface of the first electrode leads 110 that are joined and overlapped, to the outer surface of the first plate 400 via a wire. That is, the first wire connection portion 500 can directly connect the first electrode lead 110 to the first plate 400 adhered to the sensing circuit board 300 via a wire. This is because, compared to the structure of existing battery modules in which a plurality of electrode leads are connected to bus bars, the bus bars are connected to an interconnect board (ICB), and the interconnect board is connected to the sensing circuit board 300 via a connection cable, the battery module has a more simplified structure, and therefore, the volume of the secondary battery module 10 can be reduced.

[0058] The wire provided in the first wire connection portion 500 may be made of metal, which is made of a conductive material. The wire is not limited thereto, but may be made of one or more materials selected from, for example, gold (Au), aluminum (Al), copper (Cu), and silver (Ag).

[0059] The first wire connection portion 500 may connect the first electrode lead 110 to the first plate 400 through a plurality of wires.

[0060] The secondary battery module 10 may further include a flexible circuit board 600 , a second plate 410 , and a second wire connection portion 510 .

[0061] The flexible circuit board 600 may be mounted on the other surface of the module case 200 and may be electrically connected to the second electrode lead 120 of the secondary battery 100. The flexible circuit board 600 may be mounted at a position adjacent to the second electrode lead 120 passing through the lead hole 220 so that the flexible circuit board 600 is electrically connected to the second electrode lead 120.

[0062] The flexible circuit board 600 may have a variable shape, such as being easily bent due to being made of a flexible material. For example, the flexible circuit board 600 may be a polyimide film, a polyester film, or the like.

[0063] Since the flexible circuit board 600 is electrically connected to the second electrode lead 120, it is possible to sense the voltage of the second electrode lead 120. The voltage sensed by the flexible circuit board 600 may be transmitted to the sensing circuit board 300 through the connector 700.

[0064] The flexible circuit board 600 may be mounted on another surface of the module housing 200 adjacent to the location where the second electrode lead 210 protrudes through the lead hole 220 to facilitate connection with the second electrode lead 120. In particular, the second pad portion 610 of the flexible circuit board 600 may be disposed adjacent to the overlapping second electrode lead 120 so as to be connected to the second electrode lead 120 via a wire.

[0065] The flexible circuit board 600 may include a second supporting portion 630 supporting the board, a second metal layer 620 defining a circuit of the flexible circuit board 600 over the second supporting portion 630 , and a second pad portion 610 electrically connected to the second metal layer 620 .

[0066] A second pad portion 610 having a predetermined width may be provided on the flexible circuit board 600 to be electrically connected to the second electrode lead 120 of the secondary battery 100. The second pad portion 610 may be provided at a position branched by a predetermined length from the longitudinal direction of the flexible circuit board 600 in a direction in which the second electrode lead 120 is provided.

[0067] The second pad portion 610 may be provided by plating a conductive metal on the surface of the second metal layer so as to be electrically connected to the second metal defining the circuit of the flexible circuit board 600. The plated metal is not limited thereto but may be a material such as, for example, gold, silver, copper, aluminum, or tin.

[0068] Since the second pad portion 610 is not easily bonded to a wire for electrical connection with the second electrode lead 120 , the second plate 410 made of a material favorable for bonding a wire may be bonded to a top surface of the second pad portion 610 .

[0069] The second plate 410 may be provided in a thin plate shape made of a conductive metal material. The second plate 410 may be bonded to the second pad portion 610, and the second plate 410 may be bonded to the second pad portion 610 through a welding process. Therefore, a second welding layer 411 that melts, cools, and solidifies may be provided between the second plate 410 and the second pad portion 610.

[0070] The second plate 410 may be made of a material that is not easily oxidized and has excellent chemical resistance to prevent an oxide film from being formed on the surface, thereby facilitating bonding with the second wire connection portion 510. For example, the first plate 400 may include one or more materials of nickel (Ni), palladium (Pd), gold (Au), and chromium (Cr), and preferably includes nickel or a nickel alloy material in which chromium is added to nickel.

[0071] The second wire connection portion 510 can connect the outer surface of the second electrode lead 120, which is disposed on the outermost surface of the second electrode leads 120 that are joined to overlap each other, to the outer surface of the second plate 410 via a wire. That is, the second wire connection portion 510 can directly connect the second electrode lead 120 to the second plate 410 adhered to the flexible circuit board 600 via a wire. This is because the battery module has a more simplified structure compared to the structure of existing battery modules that connect multiple electrode leads to bus bars, connect the bus bars to an interconnect board (ICB), and then connect the interconnect board to the sensing circuit board 300 via a connection unit. Therefore, the volume of the secondary battery module 10 can be reduced.

[0072] The wire provided in the second wire connection portion 510 may be made of metal, which is made of a conductive material. The wire is not limited thereto, but may be made of, for example, one or more materials selected from gold (Au), aluminum (Al), copper (Cu), and silver (Ag).

[0073] The second wire connection portion 510 may connect the second electrode lead 120 to the second plate 410 through a plurality of wires.

[0074] The connector 700 may electrically connect the flexible circuit board 600 to the sensing circuit board 300 to transmit a value sensed by the flexible circuit board 600 to the sensing circuit board 300 .

[0075] The connector 700 may include a first connection unit 710 , a second connection unit 720 , and a cable 730 .

[0076] The first connection unit 710 may be coupled to one surface of the sensing circuit board 300, the second connection unit 720 may be coupled to one side of the flexible circuit board 600, and the cable 730 may connect the first connection unit 710 to the second connection unit 720. The cable 730 may be provided along a length direction of the secondary battery 100 to transmit information such as voltage and temperature between the first connection unit 710 and the second connection unit 720.

[0077] Second embodiment

[0078] According to a second embodiment of the present invention, a battery pack (not shown) of a secondary battery 100 of the present invention may include a plurality of secondary battery modules 10 and a battery pack housing (not shown) that accommodates the plurality of secondary battery modules 10. The secondary battery module 10 may include the plurality of secondary batteries 100, including first electrode leads 110 disposed on one side thereof, a module housing 200 that accommodates the plurality of secondary batteries 100 and through which the first electrode leads 110 pass through the module housing 200 through a plurality of slit holes defined in one surface thereof, a sensing circuit board 300 mounted on the module housing 200 and having a first pad portion 310 plated with a conductive metal disposed on a surface thereof, the first plate 400 bonded to the first pad portion 310, and the first wire connection portion 500 connecting the first plate 400 to the first electrode lead 110 via a wire. The above description will be substituted for the detailed description of the secondary battery module 10.

[0079] Although the present technology has been described by the above examples, the present technology is not limited thereto. Without departing from the spirit and scope of the present technology, the above embodiments may be modified or changed, and those skilled in the art will recognize that these modifications and changes also belong to the present technology.

[0080] [Description of Reference Signs]

[0081] 10: Secondary battery module

[0082] 100: Secondary battery

[0083] 110: First electrode lead

[0084] 111: First welding part

[0085] 120: Second electrode lead

[0086] 121: Second welding part

[0087] 200: Module housing

[0088] 210: Slit hole

[0089] 211: First slit hole

[0090] 212: Second slit hole

[0091] 220: Lead hole

[0092] 221: First lead hole

[0093] 222: Second lead hole

[0094] 300: Sensing circuit board

[0095] 310: First pad part

[0096] 320: First metal layer

[0097] 330: First support part

[0098] 400: First board

[0099] 401: First welding layer

[0100] 410: Second board

[0101] 411: Second welding layer

[0102] 500: First wire connection part

[0103] 510: Second wire connection part

[0104] 600: Flexible circuit board

[0105] 610: Second pad portion

[0106] 620: Second metal layer

[0107] 630: Second support part

[0108] 700: Connector

[0109] 710: First connection unit

[0110] 720: Second connection unit

[0111] 730: Cable

Claims

1. A secondary battery module, comprising: a plurality of secondary batteries, each comprising a first electrode lead disposed on one side thereof; a module case configured to accommodate the plurality of secondary batteries, and through which the first electrode lead passes through a plurality of slit holes formed in one surface of the module case; a sensing circuit board, the sensing circuit board being mounted on the module housing and having a first pad portion plated with a conductive metal provided on a surface of the sensing circuit board; a first plate bonded to the first pad portion; as well as A first wire connection portion is configured to connect the first plate to the first electrode lead through a wire.

2. The secondary battery module according to claim 1, wherein The first plate includes a nickel (Ni) material.

3. The secondary battery module according to claim 1, wherein The first plates are joined by a welding process.

4. The secondary battery module according to claim 1, wherein The plurality of slit holes include a first slit hole and a second slit hole respectively defined on both sides of the first plate, A first electrode lead passing through the first slit hole and a second electrode lead passing through the second slit hole are folded toward each other to overlap each other, and The overlapping first electrode leads are bonded to each other.

5. The secondary battery module according to claim 4, wherein The first wire connection portion is configured to connect a first electrode lead disposed on an outermost surface among the joined first electrode leads to the first plate through the wire.

6. The secondary battery module according to claim 1, wherein The sensing circuit board is configured to sense a voltage of each of the secondary batteries.

7. The secondary battery module according to claim 1, further comprising: a flexible circuit board mounted on the other surface of the module housing and provided with a second pad portion plated with a conductive metal on a surface of the flexible circuit board; a second plate bonded to the second pad portion; as well as a second wire connection portion configured to connect a second electrode lead provided at the other side of the secondary battery to the second plate through a wire.

8. The secondary battery module according to claim 7, wherein A first lead hole and a second lead hole are formed on both sides of the second plate on the other surface of the module housing, The second electrode lead passed through the first lead hole and the first electrode lead passed through the second lead hole are folded toward each other to overlap each other, and The overlapping second electrode leads are bonded to each other.

9. The secondary battery module according to claim 8, wherein The second wire connection portion is configured to connect a second electrode lead disposed on an outermost surface among the joined second electrode leads to the second plate through the wire. 10 . The secondary battery module according to claim 7 , further comprising a connector configured to electrically connect the sensing circuit board to the flexible circuit board.

11. The secondary battery module according to claim 10, wherein The connector comprises: a first connecting unit coupled to the sensing circuit board; a second connection unit coupled to the flexible circuit board; and A cable is configured to connect the first connection unit to the second connection unit.

12. A secondary battery pack, comprising: a plurality of secondary battery modules; as well as a battery pack case configured to accommodate the plurality of secondary battery modules, Wherein, each of the plurality of secondary battery modules comprises: a plurality of secondary batteries, each comprising a first electrode lead disposed on one side thereof; a module case configured to accommodate the plurality of secondary batteries, and through which the first electrode lead passes through a plurality of slit holes formed in one surface of the module case; a sensing circuit board, the sensing circuit board being mounted on the module housing and having a first pad portion plated with a conductive metal provided on a surface of the sensing circuit board; a first plate bonded to the first pad portion; and A first wire connection portion is configured to connect the first plate to the first electrode lead through a wire.

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