Secondary Battery Module

Abstract

The present invention relates to a secondary battery module, and more specifically, the present invention provides a secondary battery module including: a plurality of secondary batteries each having a first electrode lead formed on one side; a module case that houses the plurality of secondary batteries and through which the first electrode leads pass through a plurality of slits formed on one surface; a sensing circuit board that is attached to the module case and has a first land portion plated with a conductive metal on its surface; a first plate bonded to the first land portion; and a first wire connecting portion that connects the first plate and the first electrode lead with a wire.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0181893, filed December 22, 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 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 by wires. [Background technology]

[0003] In recent years, the demand for secondary batteries that can store generated electrical energy has increased due to air pollution caused by the use of fossil fuels and the development of alternative energy sources to combat energy depletion. Secondary batteries, which can be charged and discharged, are used in mobile devices, electric vehicles, hybrid electric vehicles, and other applications, making them an integral part of everyday life.

[0004] In modern society, secondary batteries are used as energy sources for various electronic devices, and the required capacity is increasing due to the increasing use and complexity of mobile devices and the development of electric vehicles, etc. To meet user demands, multiple secondary batteries are installed in small devices, and secondary battery modules in which multiple secondary batteries are electrically connected or secondary battery packs equipped with multiple such secondary battery modules are used in automobiles, etc.

[0005] Within such a secondary battery module, secondary batteries may be electrically connected in parallel and / or series. In this case, electrical connection between secondary batteries is often achieved by providing a bus bar assembly in the secondary battery module and connecting electrode leads of the secondary batteries to the bus bar. The bus bar is connected to an interconnect board, which is connected to a cell-monitoring controller (CMC) circuit board, resulting in a complex structure of the secondary battery module. Furthermore, flexible printed circuit boards (FPCBs) and printed circuit boards (PCBs) used for electrical connection with the secondary batteries are electrically connected to the secondary batteries via connectors separate from the bus bar connected to the secondary batteries, resulting in an increased number of components, increased volume, and a complex structure. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made to solve the above problems, and provides a secondary battery module that can be simplified in structure and reduced in volume by removing bus bars and connecting circuit boards. [Means for solving the problem]

[0007] According to a first embodiment of the present invention, there is provided a secondary battery module including: a plurality of secondary batteries each having a first electrode lead formed on one side; a module case that houses the plurality of secondary batteries and through which the first electrode lead passes through a plurality of slits formed on one surface; a sensing circuit board that is attached to the module case and has a first land portion plated with a conductive metal on its surface; a first plate bonded to the first land portion; and a first wire connecting portion that connects the first plate and the first electrode lead with a wire.

[0008] The first plate may also include a nickel (Ni) material. Also, the first plate can be joined by a soldering process. In addition, the plurality of slit holes may be arranged as a first slit hole and a second slit hole on both sides of the first plate, and the first electrode lead passing through the first slit hole and the first electrode lead passing through the second slit hole may be folded toward each other and overlapped with each other, and the overlapped first electrode leads may be joined with each other.

[0009] The first wire connecting portion may connect a first electrode lead located on an outermost side of the joined first electrode leads to the first plate through a wire. The sensing circuit board can also sense the voltage of the secondary battery.

[0010] The module may further include a flexible circuit board attached to the other side of the module case and having a second land portion plated with a conductive metal on its surface, a second plate joined to the second land portion, and a second wire connecting portion connecting a second electrode lead formed on the other side of the secondary battery to the second plate with a wire.

[0011] In addition, on the other surface of the module case, a first lead hole and a second lead hole are formed on both sides of the second plate, respectively, and the second electrode lead passing through the first lead hole and the second electrode lead passing through the second lead hole are folded toward each other and overlapped with each other, and the overlapped second electrode leads can be joined to each other.

[0012] The second wire connecting portion may connect a second electrode lead located on an outermost side of the joined second electrode leads to the second plate through a wire.

[0013] The sensor may further include a connector that electrically connects the sensing circuit board and the flexible circuit board. The connector may also include a first connection unit coupled to the sensing circuit board, a second connection unit coupled to the flexible circuit board, and a cable connecting the first connection unit and the second connection unit.

[0014] According to a second embodiment of the present invention, there is provided a secondary battery pack including a plurality of secondary battery modules and a pack case accommodating the plurality of secondary battery modules, wherein the secondary battery modules include 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 slits formed on one surface thereof through which the first electrode leads pass, a sensing circuit board attached to the module case and having a first land portion plated with a conductive metal formed on its surface, a first plate joined to the first land portion, and a first wire connecting portion connecting the first plate and the first electrode lead with a wire. [Effects of the Invention]

[0015] The present invention folds and overlaps opposing electrode leads and bonds the overlapped electrode leads at once, thereby stably fixing the positions of the electrode leads and replacing a conventional bus bar. Since the electrode leads and the sensing circuit board are directly connected by wires, the present invention can replace an interconnect circuit board (ICB) connected to a bus bar, thereby simplifying the structure of a secondary battery module and reducing the volume of the secondary battery module. Furthermore, since the electrode leads of the secondary battery and the sensing circuit board are directly connected by wires without the need for a separate connector cable, the structure of the secondary battery module can be simplified. [Brief explanation of the drawings]

[0016] [Figure 1]As a first embodiment of the present invention, this is a perspective view of one side of a module case of a secondary battery module, and an enlarged view of the first electrode lead overlapping and joining, and connected to the first plate by a wire. [Figure 2] As a first embodiment of the present invention, this is an oblique view of the other side of the module case of the secondary battery module, and an enlarged view of the second electrode lead overlapped and joined, and connected to the second plate by a wire. [Figure 3] 1 is a cross-sectional view of a sensing circuit board according to a first embodiment of the present invention, showing a state in which a first plate is joined. [Figure 4] 1 is a cross-sectional view of a flexible circuit board according to a first embodiment of the present invention, showing a state in which a second plate is joined. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be described in more detail below with reference to the drawings. However, the following drawings are intended to facilitate understanding of the present invention, are merely one embodiment of the present invention, and the scope of the present invention is not limited to the scope described in the drawings. Furthermore, in the following drawings, the same reference numerals refer to the same components, and some components may be exaggerated, reduced, or omitted to facilitate understanding of the invention.

[0018] Furthermore, the terms and words used in this specification and claims should not be interpreted in a limited way to their ordinary or dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, based on the principle that inventors can appropriately define the concepts of terms in order to best explain their inventions.

[0019] First embodiment Referring to FIG. 1, as an 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 plate 400, and a first wire connecting part 500.

[0020] The secondary battery 100 may be formed in a structure in which an electrode assembly (not shown) is housed inside a pouch-type battery case, with a first electrode lead 110 protruding from one side of the battery case and a second electrode lead 120 protruding from the other side. That is, the secondary battery 100 may include the first electrode lead 110 formed on one side and the second electrode lead 120 formed on the other side.

[0021] The electrode assembly may have a structure in which a positive electrode current collector / positive electrode active material layer / separator / negative electrode active material layer / negative electrode current collector are stacked in this order. The positive electrode uncoated region may function as a positive electrode tab. The negative electrode current collector includes an area coated with a negative electrode active material layer and an uncoated negative electrode uncoated region, and the negative electrode uncoated region may function as a negative electrode tab. The separator is disposed between the positive electrode current collector and the negative electrode current collector to prevent contact between current collectors of opposite polarities. The first electrode lead 110 may be connected to the positive electrode uncoated region or the negative electrode uncoated region, and the second electrode lead 120 may also be connected to the positive electrode uncoated region or the negative electrode uncoated region.

[0022] The module case 200 refers to a frame that forms the external shape of the secondary battery module 10, and may have an accommodation space formed therein. A plurality of secondary batteries 100 may be accommodated in the accommodation space formed inside the module case 200, and the module case 200 surrounds a stack of the plurality of secondary batteries 100 with four inner walls, thereby stably supporting the stacked configuration of the secondary batteries 100.

[0023] The secondary battery 100 accommodated in the module case 200 can be arranged so that the first electrode lead 110 faces the direction in which the slit hole is formed, and the second electrode lead 120 faces the direction in which the lead hole 220 is formed.

[0024] The plurality of secondary batteries 100 accommodated in the accommodation space of the module case 200 may be arranged upright with their narrow sides facing up and down, and stacked along the width direction of the module case 200 with their wide sides in contact with each other. Here, the width direction of the module case 200 may refer to the length direction of the surface of the module case 200 to which the sensing circuit board 300 or the flexible circuit board 600 is attached.

[0025] A plurality of slit holes 210 may be formed in one surface of the module case 200. The one surface of the module case 200 refers to a surface formed along the width of the module case 200, and may refer to a surface formed 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 formed in the opposite direction of the one surface.

[0026] The slit holes 210 may be holes through which the first electrode leads 110 of the multiple secondary batteries 100 housed in the housing space of the module case 200 penetrate the module case 200 and project to the outside of the module case 200 . The slit hole 210 may be formed with a narrow width and a vertical length so that the first electrode lead 110 can pass through.

[0027] The plurality of slit holes 210 may be divided into first slit holes 211 and second slit holes 212 according to their respective positions relative to the position of the first plate 400. The first slit hole 211 may refer to a slit hole 210, among the plurality of slit holes, that is arranged in one direction from the position of the first plate 400 as the center and adjacent to the first plate 400. The second slit hole 212 may refer to a slit hole 210, among the plurality of slit holes, that is arranged in the other direction from the position of the first plate 400 as the center and adjacent to the first plate 400. That is, the first slit hole 211 and the second slit hole 212 may be arranged on both sides of the first plate 400. By arranging the first slit hole 211 and the second slit hole 212 on both sides of the first plate 400, a bonding process of the first electrode lead 110 passing through the first slit hole 211 and the second slit hole 212 can be performed at one time, thereby improving the efficiency of the manufacturing process.

[0028] 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 and arranged to overlap each other so as to be joined. The folded and overlapped first electrode leads 110 may be joined to each other. More specifically, the overlapped first electrode leads 110 may be joined to each other by a welding method, including, but not limited to, laser welding, electric resistance welding, ultrasonic welding, spot welding, etc. The joined first electrode leads 110 may be electrically connected, and their positions and folded shapes may be stably fixed. A first weld 111 may be formed on the outermost surfaces of the welded first electrode leads 110. Therefore, the first electrode leads 110 joined together are joined between the first electrode leads 110 and are stably fixed in position, so that the structure of the secondary battery module 10 can be simplified and the volume can be reduced by replacing the conventional bus bar.

[0029] A plurality of first plates 400 are arranged along the width direction of one side of the module case 200, and thus the first slit holes 211 and the second slit holes 212 can also be arranged adjacent to both sides of the first plate 400 at each position where the first plate 400 is arranged.

[0030] A plurality of first slit holes 211 and a plurality of second slit holes 212 may be arranged on both sides of any one of the first plates 400. Therefore, 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. Since the overlapped plurality of first electrode leads 110 can be joined to each other at one time, process efficiency can be maximized. The overlapped plurality of first electrode leads 110 may be joined to each other by a welding method, and the welding method may be, but is not limited to, laser welding, electric resistance welding, ultrasonic welding, spot welding, etc.

[0031] A plurality of lead holes 220 may be formed on the other surface of the module case 200. The other surface of the module case 200 refers to a surface formed along the width of the module case 200, and may refer to a surface formed 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 formed in the opposite direction of one surface.

[0032] The lead hole 220 may be a hole through which the second electrode leads 120 of the multiple secondary batteries 100 accommodated in the accommodation space of the module case 200 penetrate the module case 200 and protrude to the outside of the module case 200. The lead hole 220 may refer to a hole whose length is in the vertical direction and whose width is narrow so that the second electrode leads 120 can penetrate.

[0033] The plurality of lead holes 220 may be divided into first lead holes 221 and second lead holes 222 according to their respective positions relative to the position of the second plate 410. The first lead hole 221 may refer to a lead hole 220 among the plurality of lead holes 220 that is arranged in one direction from the position of the second plate 410 as the center and adjacent to the second plate 410. The second lead hole 222 may refer to a lead hole 220 among the plurality of lead holes 220 that is arranged in the other direction from the position of the second plate 410 as the center and adjacent to the second plate 410. That is, the first lead hole 221 and the second lead hole 222 may be arranged on both sides of the second plate 410. By arranging the first lead hole 221 and the second lead hole 222 on both sides of the second plate 410, a bonding process of the second electrode lead 120 passing through the first lead hole 221 and the second lead hole 222 can be performed at one time, thereby improving efficiency.

[0034] The second electrode leads 120 passing through the first lead holes 221 and the second electrode leads 120 passing through the second lead holes 222 may face each other, and the second electrode leads 120 passing through the first lead holes 221 and the second electrode leads 120 passing through the second lead holes 222 may be folded toward each other and arranged to overlap each other so as to be joined. The folded and overlapped second electrode leads 120 may be joined to each other by a welding method, and the welding method may be, but is not limited to, laser welding, electric resistance welding, ultrasonic welding, spot welding, etc. The joined second electrode leads 120 may be electrically connected, and their positions and folded shape may be stably fixed. A second weld 121 may be formed on the outermost surfaces of the welded second electrode leads 120. Therefore, the second electrode leads 120 joined together are joined between the second electrode leads 120 and are stably fixed in position, so that the structure of the secondary battery module 10 can be simplified and the volume can be reduced by replacing the conventional bus bar.

[0035] The second plates 410 are arranged in multiple locations along the width direction of the other side of the module case 200, so that the first slit holes 211 and the second slit holes 212 can also be arranged adjacent to both sides of the first plate 400 at each position where the first plate 400 is arranged.

[0036] A plurality of first lead holes 221 and a plurality of second lead holes 222 may be arranged on both sides of any one of the second plates 410. Therefore, 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. Since the overlapped second electrode leads 120 can be joined to each other at one time, process efficiency can be maximized. The overlapped second electrode leads 120 may be joined to each other by a welding method, and the welding method may be, but is not limited to, laser welding, electric resistance welding, ultrasonic welding, spot welding, etc. A first weld 111 may be formed on the outermost surface of the welded second electrode leads 120.

[0037] The sensing circuit board 300 is attached to one surface of the module case 200 and can sense the voltage, temperature, etc. of the secondary battery 100 and transmit the sensed values ​​to a battery management system (BMS). The sensing circuit board 300 may be a cell-monitoring controller (CMC) circuit board. The sensing circuit board 300 may be attached to one surface of the module case 200 adjacent to a position where the first electrode lead 110 protrudes through the slit hole 210 so as to facilitate connection with the first electrode lead 110. In particular, the first land portion 310 of the sensing circuit board 300 may be located adjacent to the overlapping first electrode lead 110 so as to be connected to the first electrode lead 110 by a wire.

[0038] The sensing circuit board 300 may include a first support part 330 that supports the board, a first metal layer 320 that forms a circuit of the sensing circuit board 300 on the top of the first support part 330, and a first land part 310 electrically connected to the first metal layer 320.

[0039] The sensing circuit board 300 may be formed with a first land portion 310 having a predetermined width so as to be electrically connected to the first electrode lead 110 of the secondary battery 100 .

[0040] The first land portion 310 may be formed by plating a conductive metal on the surface of the first metal layer so as to be electrically connected to the first metal layer forming the circuit of the sensing circuit board 300. The plated metal may be, but is not limited to, gold, silver, copper, aluminum, tin, or the like.

[0041] However, since the first land portion 310 is not easy to join with a wire for electrically connecting it to the first electrode lead 110, a first plate 400 made of a material that is easy to join with a wire can be joined to the upper surface of the first land portion 310.

[0042] The first plate 400 may be a thin plate made of a conductive metal material. The first plate 400 may be bonded onto the first land portion 310 by a soldering process. Therefore, a first soldering layer 401 may be formed between the first plate 400 and the first land portion 310, which is melted, cooled, and solidified.

[0043] The first plate 400 may be made of a material that is not easily oxidized, has excellent chemical resistance, and can prevent the formation of an oxide film on its surface, so as to facilitate bonding with the first wire connecting portion 500. For example, the first plate 400 may include one or more of nickel (Ni), palladium (Pd), gold (Au), and chromium (Cr), and preferably may include nickel or a nickel alloy material in which chromium is added to nickel.

[0044] The first wire connector 500 may connect, via a wire, an outer surface of the first electrode lead 110 located at the outermost side of the overlapped and joined first electrode leads 110 to the outer surface of the first plate 400. That is, the first wire connector 500 may directly connect, via a wire, the first electrode lead 110 to the first plate 400 attached to the sensing circuit board 300. This results in a much simpler structure compared to a conventional battery module structure in which multiple electrode leads are joined to a bus bar, the bus bar is connected to a connection circuit board (ICB), and the connection circuit board is connected to the sensing circuit board 300 via a connection cable, thereby enabling the volume of the secondary battery module 10 to be reduced.

[0045] The wire included in the first wire connecting unit 500 may be made of a conductive metal material, such as, but not limited to, gold (Au), aluminum (Al), copper (Cu), and silver (Ag). The first wire connecting part 500 may connect the first electrode lead 110 and the first plate 400 via a plurality of wires.

[0046] The secondary battery module 10 may further include a flexible circuit board 600 , a second plate 410 , and a second wire connecting portion 510 . The flexible circuit board 600 may be attached to the other surface of the module case 200 and electrically connected to the second electrode lead 120 of the secondary battery 100. The flexible circuit board 600 may be attached at a position adjacent to the second electrode lead 120 passing through the lead hole 220 so as to be electrically connected to the second electrode lead 120.

[0047] The flexible circuit board 600 includes a flexible material and can be easily bent and changed in shape, etc. For example, it may be made of a polyimide film, a polyester film, or the like.

[0048] The flexible circuit board 600 is electrically connected to the second electrode lead 120 and can sense the voltage of the second electrode lead 120. The voltage sensed by the flexible circuit board 600 can be transmitted to the sensing circuit board 300 via the connector 700.

[0049] The flexible circuit board 600 may be attached to another surface of the module case 200 adjacent to the position where the second electrode lead 210 protrudes through the lead hole 220 so as to facilitate connection with the second electrode lead 120. In particular, the second land portion 610 of the flexible circuit board 600 may be located adjacent to the overlapping second electrode lead 120 so as to be connected to the second electrode lead 120 by a wire.

[0050] The flexible circuit board 600 may include a second support part 630 that supports the board, a second metal layer 620 that forms a circuit of the flexible circuit board 600 on the second support part 630, and a second land part 610 electrically connected to the second metal layer 620.

[0051] The flexible circuit board 600 may have a second land portion 610 formed with a predetermined width so as to be electrically connected to the second electrode lead 120 of the secondary battery 100. The second land portion 610 may be located at a position branched by a predetermined length from the length direction of the flexible circuit board 600 in a direction where the second electrode lead 120 is located.

[0052] The second land portion 610 may be formed by plating a conductive metal on the surface of the second metal layer so as to be electrically connected to the second metal layer forming the circuit of the flexible circuit board 600. The plated metal may be, but is not limited to, gold, silver, copper, aluminum, tin, or the like.

[0053] Since the second land portion 610 is not easy to bond with a wire for electrically connecting to the second electrode lead 120, a second plate 410 made of a material that is easy to bond with a wire can be bonded to the upper surface of the second land portion 610.

[0054] The second plate 410 may be a thin plate made of a conductive metal material. The second plate 410 may be bonded onto the second land portion 610 by a soldering process. Therefore, a second solder layer 411 may be formed between the second plate 410 and the second land portion 610, which is melted, cooled, and solidified.

[0055] The second plate 410 may be made of a material that is not easily oxidized, has excellent chemical resistance, and can prevent the formation of an oxide film on its surface, so as to facilitate bonding with the second wire connecting portion 510. For example, the second plate 410 may include one or more of nickel (Ni), palladium (Pd), gold (Au), and chromium (Cr), and preferably may include nickel or a nickel alloy material in which chromium is added to nickel.

[0056] The second wire connecting unit 510 may connect, via a wire, an outer surface of the second electrode lead 120 located at the outermost side of the overlapped and joined second electrode leads 120 to the outer surface of the second plate 410. That is, the second wire connecting unit 510 may directly connect, via a wire, the second electrode lead 120 to the second plate 410 attached to the flexible circuit board 600. This results in a much simpler structure than the conventional battery module structure in which multiple electrode leads are joined to a bus bar, the bus bar is connected to a connection circuit board (ICB), and the connection circuit board is connected to the sensing circuit board 300 via a connection unit, thereby enabling the volume of the secondary battery module 10 to be reduced.

[0057] The wire included in the second wire connecting portion 510 may be made of a conductive metal material, such as, but not limited to, gold (Au), aluminum (Al), copper (Cu), and silver (Ag). The second wire connecting part 510 may connect the second electrode lead 120 and the second plate 410 via a plurality of wires.

[0058] The connector 700 can electrically connect the flexible circuit board 600 and the sensing circuit board 300 and can transmit the value sensed by the flexible circuit board 600 to the sensing circuit board 300 . The connector 700 may include a first connection unit 710 , a second connection unit 720 , and a cable 730 .

[0059] The first connection unit 710 is coupled to one surface of the sensing circuit board 300, and the second connection unit 720 is coupled to one surface of the flexible circuit board 600. A cable 730 may connect the first connection unit 710 and the second connection unit 720. The cable 730 is arranged along the length of the secondary battery 100 and may transmit information such as voltage and temperature between the first connection unit 710 and the second connection unit 720.

[0060] Second embodiment In a second embodiment of the present invention, a secondary battery 100 pack (not shown) of the present invention may include a plurality of secondary battery modules 10 and a pack case (not shown) that houses the plurality of secondary battery modules 10. The secondary battery module 10 may include a plurality of secondary batteries 100 each having a first electrode lead 110 formed on one side thereof, a module case 200 that houses the plurality of secondary batteries 100 and through which the first electrode leads 110 pass through a plurality of slits formed on one surface thereof, a sensing circuit board 300 attached to the module case 200 and having a first land portion 310 plated with a conductive metal on its surface, a first plate 400 bonded to the first land portion 310, and a first wire connector 500 that connects the first plate 400 and the first electrode lead 110 with a wire. A detailed description of the secondary battery module 10 will be provided above.

[0061] Although the present technology has been described above using the embodiments, the present technology is not limited thereto. The above embodiments may be modified or changed without departing from the spirit and scope of the present technology, and a person skilled in the art would understand that such modifications and changes also belong to the present technology. [Explanation of symbols]

[0062] 10: Secondary battery module 100: Secondary battery 110: First electrode lead 111: First welding section 120: Second electrode lead 121: Second weld 200:Module case 210: Slit hole 211: First slit hole 212: Second slit hole 220: Lead hole 221: First lead hole 222: Second lead hole 300: Sensing circuit board 310: First Land Section 320: 1st metal layer 330: 1st support part 400: 1st plate 401: First solder layer 410: Second plate 411: Second solder layer 500: First wire connecting part 510: Second wire connecting portion 600: Flexible circuit board 610: Second Land Section 620: 2nd metal layer 630:Second support part 700: Connector 710: First connecting unit 720: Second connecting unit 730: Cable

Claims

1. a plurality of secondary batteries each including a first electrode lead formed on one side; a module case that houses the plurality of secondary batteries and through which the first electrode leads pass through a plurality of slits formed on one surface; a sensing circuit board attached to the module case, the sensing circuit board having a first land portion plated with a conductive metal on its surface; a first plate joined to the first land portion; a first wire connecting portion connecting the first plate and the first electrode lead with a wire; A secondary battery module comprising:

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

3. The secondary battery module according to claim 1 , wherein the first plate is joined by a soldering process.

4. The plurality of slit holes are a first slit hole and a second slit hole are arranged on both sides of the first plate, the first electrode lead passing through the first slit hole and the first electrode lead passing through the second slit hole are folded toward each other and overlapped with each other; The secondary battery module according to claim 1 , wherein the overlapped first electrode leads are joined to each other.

5. The first wire connecting portion is The secondary battery module of claim 4 , wherein a first electrode lead located on an outermost side of the joined first electrode leads is connected to the first plate by a wire.

6. The secondary battery module according to claim 1 , wherein the sensing circuit board senses voltages of the plurality of secondary batteries.

7. a flexible circuit board attached to the other surface of the module case, the flexible circuit board having a second land portion plated with a conductive metal on its surface; a second plate joined to the second land portion; 6. The secondary battery module of claim 1, further comprising: a second wire connecting portion connecting a second electrode lead formed on another side of the plurality of secondary batteries to the second plate with a wire.

8. On the other side of the module case: a first lead hole and a second lead hole are formed on both sides of the second plate, the second electrode lead passing through the first lead hole and the second electrode lead passing through the second lead hole are folded toward each other and overlapped with each other; The secondary battery module according to claim 7 , wherein the overlapped second electrode leads are joined to each other.

9. The second wire connecting portion is The secondary battery module of claim 8 , wherein a second electrode lead located on an outermost side of the joined second electrode leads is connected to the second plate by a wire.

10. The secondary battery module of claim 7 , further comprising a connector electrically connecting the sensing circuit board and the flexible circuit board.

11. The connector comprises: a first connection unit coupled to the sensing circuit board; a second connection unit coupled to the flexible circuit board; The secondary battery module of claim 10 , further comprising: a cable connecting the first connecting unit and the second connecting unit.

12. a plurality of secondary battery modules; a pack case that houses the plurality of secondary battery modules; Including, Each of the plurality of secondary battery modules is a plurality of secondary batteries each including a first electrode lead formed on one side; a module case that houses the plurality of secondary batteries and through which the first electrode leads pass through a plurality of slits formed on one surface; a sensing circuit board attached to the module case, the sensing circuit board having a first land portion plated with a conductive metal on its surface; a first plate joined to the first land portion; a first wire connecting portion connecting the first plate and the first electrode lead with a wire; a secondary battery pack including:

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