Sensing assembly and battery module

Abstract

The present invention relates to a sensing assembly and a battery module, which can have a relatively small weight, simplify a component assembly process, reduce manufacturing costs, and prevent a sensing leg from being damaged due to an assembly step or an external force. The sensing assembly according to the present invention can include a first substrate having at least one first terminal and at least one second terminal disposed on one surface and formed of a rigid printed circuit board, a second substrate including at least one sensing line electrically connected with the first terminal and formed of a flexible printed circuit board, and a sensing leg having one end portion electrically connected to the second terminal and including a fuse portion that is disconnected when an overcurrent flows.

Description

Technical Field

[0001] The following disclosure relates to a sensing component for measuring the voltage of a battery cell and a battery module incorporating the sensing component. Background Technology

[0002] A secondary battery is a device that converts external electrical energy into chemical energy, stores the chemical energy, and generates electricity when needed. Secondary batteries have been used in various fields, such as electronic devices that use electricity, hybrid vehicles, and electric vehicles.

[0003] The secondary battery is manufactured in the form of a battery module in which multiple battery cells are stacked in one direction. A sensing component senses the voltage of the battery cells included in the battery module by means of cell tabs formed on both sides of the battery cells through electrical connections. Figure 1 The disassembled state of a conventional battery module with applied sensing components is shown.

[0004] like Figure 1 As shown, in addition to the sensing component 10, the battery module 20 to which the sensing component 10 is applied may also include a battery cell stack 22, a top cover 21, a bus bar coupling member 23, a first side cover 24, and a second side cover 25.

[0005] exist Figure 1 In the battery cell stack 22 shown, battery cells are stacked in one direction, and the side surfaces of the battery cells are covered. Each battery cell in the stack 22 has a cell tab formed on both sides, which inserts into and protrudes from holes formed in a busbar connecting member 23. A busbar is formed in the busbar connecting member 23 and connects between the cell tabs, which are inserted into and protrude from the holes in the busbar connecting member 23. A sensing component 10 is connected to the busbar of the battery cell stack 22 to measure the voltage of the battery cells.

[0006] like Figure 1 As shown, the sensing component 10 includes an FPCB component 13. The FPCB component 13 is connected between the front component 11 and the rear component 12. The front component 11 is a component connected to a cell connector protruding from one side of the battery cell stack 22, and the rear component 12 is a component connected to a cell connector protruding from the other side of the battery cell stack 22.

[0007] Figure 2 yes Figure 1 An enlarged view of the front component 11 of the sensing component 10 shown.

[0008] Figure 2The front component 11 shown is a synthetic resin injection molded product and can be attached to the first substrate 14. The first substrate 14 can be a rigid printed circuit board (RPCB), and in order to transmit the voltage information of the battery cell measured by the sensing component 10 to the outside, a connector 15 for connecting external lines and a sensing leg 16 soldered to the busbar can be attached to one surface of the first substrate 14. Although the sensing leg 16 may have some shape variations depending on the product, it is generally made of a metal plate. Due to the structural characteristics of the first substrate 14 and the sensing leg 16, the sensing leg 16 can be attached to the first substrate 14 using surface mount technology (SMT). As mentioned above, because the sensing leg 16 uses a metal plate, the sensing leg 16 has a certain degree of rigidity, and because the two ends of the sensing leg 16 are respectively attached to the first substrate 14 and the busbar, there is a higher possibility that assembly steps may occur between the sensing leg 16 and the busbar, or that the sensing leg 16 may deform due to external forces applied to the sensing leg 16 when assembled at intervals not desired by the user. In particular, when an impact or vibration is applied to a battery module that uses the sensing component 10, problems such as damage to the sensing leg 16 itself may occur.

[0009] Additionally, a fuse is installed on the sensing line connected via sensing leg 16 and the first substrate 14 to block current flow when an overcurrent occurs. The problem is that this fuse complicates the component assembly process, relatively increases weight, and incurs additional costs.

[0010] Related field documents

[0011] Patent document: Korean Patent Publication No. 10-2018-0022445 Summary of the Invention

[0012] Embodiments of the present invention aim to provide sensing components and battery modules that have relatively low weight, simplify component assembly processes, reduce manufacturing costs, and prevent sensor legs from being damaged due to assembly steps or external forces.

[0013] In one general aspect, a sensing assembly includes: a first substrate formed of a rigid printed circuit board and including at least one first terminal and at least one second terminal on one surface; a second substrate formed of a flexible printed circuit board and including at least one sensing line electrically connected to the first terminal; and a sensing leg having an end electrically connected to the second terminal and including a fuse portion configured to disconnect when an overcurrent flows.

[0014] The sensing leg can be formed from a flexible printed circuit board.

[0015] The fuse part can be a wire printed on the sensing leg, and the width of one end and the other end of the wire can be greater than the width of the middle part connecting one end and the other end of the wire.

[0016] The middle part can have a curved shape.

[0017] The sensing component may further include: a first electrical connection portion disposed between one end of the second substrate and the first substrate, and electrically connecting the sensing line to the first terminal; and a second electrical connection portion disposed between one end of the sensing leg and the first substrate, and electrically connecting the fuse portion to the second terminal.

[0018] At least one of the first electrical connection and the second electrical connection can be a brazed part formed by brazing.

[0019] At least one of the first electrical connection portion and the second electrical connection portion may be a joint portion joined by means of a conductive film.

[0020] At least one of the first electrical connection and the second electrical connection can be a welded part welded by laser welding or ultrasonic welding.

[0021] In another general aspect, a battery module includes: a battery cell stack formed of a plurality of battery cells; a busbar connecting member coupled to both sides of the battery cell stack; and a sensing component coupled to the busbar connecting member to sense the voltage of the battery cells, wherein the sensing component includes: a first substrate formed of a rigid printed circuit board and including at least one first terminal and at least one second terminal on one surface; a second substrate formed of a flexible printed circuit board and including at least one sensing line electrically connected to the first terminal; and a sensing leg having an end electrically connected to the second terminal and including a fuse portion configured to disconnect when an overcurrent flows.

[0022] The sensing leg can be formed from a flexible printed circuit board.

[0023] The fuse part can be a wire printed on the sensing leg, and the width of one end and the other end of the wire can be greater than the width of the middle part connecting one end and the other end of the wire.

[0024] The middle part can have a curved shape.

[0025] The battery module may further include: a first electrical connection portion disposed between one end of the second substrate and the first substrate, and electrically connecting the sensing line and the first terminal; and a second electrical connection portion disposed between one end of the sensing leg and the first substrate, and electrically connecting the fuse portion and the second terminal.

[0026] At least one of the first electrical connection and the second electrical connection can be a brazed part formed by brazing.

[0027] At least one of the first electrical connection portion and the second electrical connection portion may be a joint portion joined by means of a conductive film.

[0028] At least one of the first electrical connection and the second electrical connection can be a welded part welded by laser welding or ultrasonic welding. Attached Figure Description

[0029] Figure 1 This is an exploded 3D view of a conventional battery module that uses sensing components.

[0030] Figure 2 yes Figure 1 An enlarged view of the front component of the sensing assembly shown.

[0031] Figure 3 This is a plan view of a sensing component according to an embodiment of the present invention.

[0032] Figure 4 This is a side view of the second substrate of the sensing component according to an embodiment of the present invention, showing a bent state.

[0033] Figure 5 This is a plan view of the sensing leg of the sensing component according to an embodiment of the present invention.

[0034] Figures 6A to 6C This is a side view schematic diagram of the sensing leg of a sensing component according to embodiments of the present invention and related fields.

[0035] Figure 7 This is an exploded perspective view of a battery module including a sensing component according to an embodiment of the present invention.

[0036] Figure 8 and Figure 9 This is a schematic diagram of step b) of a method for manufacturing a sensing component according to an embodiment of the present invention.

[0037] Figure 10 and Figure 11 This is a schematic diagram of step c) of a method for manufacturing a sensing component according to an embodiment of the present invention.

[0038] Detailed description of main components

[0039] 10: Sensing components

[0040] 11: Front component

[0041] 12: Rear component

[0042] 13: FPCB components

[0043] 14: First substrate

[0044] 15: Connector

[0045] 16: Sensing Legs

[0046] 20: Battery Module

[0047] 21: Top Cover

[0048] 22: Battery cell stack

[0049] 23: Busbar connection components

[0050] 24: First side cover

[0051] 25: Second side cover

[0052] 40: RPCB

[0053] 50: Metal-sensing leg

[0054] 60: ACF membrane

[0055] 70: Heating device

[0056] 100: First substrate

[0057] 110: Brazing Department

[0058] 121: First terminal

[0059] 122: Second terminal

[0060] 200: Second substrate

[0061] 300: Sensing Legs

[0062] 311: One end of the line

[0063] 312: The other end of the line

[0064] 313: Middle section

[0065] 1000: Sensing Components

[0066] L: Sensing line Detailed Implementation

[0067] The sensing component according to the present invention and the battery module including the sensing component will be described in detail below with reference to the accompanying drawings. The drawings are provided by way of example to fully convey the spirit of the invention to those skilled in the art, and the invention is not limited to the drawings provided below, but may be implemented in other forms.

[0068] Figure 3 A plane of a sensing component according to an embodiment of the present invention is schematically shown.

[0069] like Figure 3 As shown, the sensing component according to an embodiment of the present invention may include a first substrate 100, a second substrate 200, and a sensing leg 300.

[0070] like Figure 3 As shown, in this embodiment, a pair of first substrates 100 can be spaced apart from each other, and each first substrate 100 can be formed of a rigid printed circuit board (RPCB). Figure 3 As shown by the dashed lines, circuitry for electrically connecting the second substrate 200 to the sensing leg 300, which will be described later, can be printed on or inside the surface of the first substrate 100. The pair of first substrates 100 can each be coupled to the front and rear surfaces of the battery cell stack.

[0071] It can be on one surface of the first substrate 100 ( Figure 3 A first terminal 121 and a second terminal 122 are formed on the surface shown. The first terminal 121 is electrically connected to the second substrate 200, which will be described later, and the second terminal 122 is electrically connected to the sensing leg 300, which will be described later.

[0072] like Figure 3 As shown, a second substrate 200 is connected between a pair of first substrates 100 spaced apart from each other. Unlike the first substrates 100, the second substrate 200 can be formed of a flexible printed circuit board (hereinafter referred to as FPCB). The reason for forming the second substrate 200 as an FPCB is that the FPCB has a relatively thinner thickness compared to a refractive PCB, thus reducing the weight of the sensing component and the battery module including the sensing component. In addition, the second substrate 200 is formed of an FPCB to improve the space utilization of the battery module, and the sensing component can be manufactured without damaging the second substrate 200 or other components, even if assembly errors occur within the allowable tolerance range.

[0073] like Figure 3 As shown, sensing lines L are formed on the second substrate 200, and each sensing line L is formed from one end of the second substrate 200 to the other end.

[0074] like Figure 3As shown, one end of the second substrate 200 is placed on one surface of the first substrate 100. That is, one end of the second substrate 200 is placed on one surface of the first substrate 100 such that one surface of the first substrate 100 and one surface of the second substrate 200 (a surface on the side of the first substrate 100) face each other. The reason for this facing arrangement is to further enhance the bonding force between the first substrate 100 and the second substrate 200 when they are electrically connected. As described above, a first terminal 121 of the sensing line L to be connected to the second substrate 200 is formed on one surface of the first substrate 100. One end of the second substrate 200 is placed on one surface of the first substrate 100 to connect to the first terminal 121 of the first substrate 100, and then the first terminal 121 and the sensing line L can be electrically connected to each other through a first electrical connection portion. In an embodiment of the present invention, the first electrical connection portion is a brazing portion 110 formed by soldering.

[0075] Typically, both RPCBs and FPCBs are used. However, the conventional method involves forming connectors on each of the RPCBs and FPCBs and interconnecting these connectors to use both the FPCB and RPCB together. This method further includes processes for electrically connecting the connectors to the RPCB and to the FPCB, which increases production costs compared to this embodiment.

[0076] On the other hand, in this embodiment, the first substrate 100 and the second substrate 200 are directly connected by brazing without the need for separate connectors, thereby reducing production costs and simplifying the production process compared to the conventional method described above. The method for forming the brazed portion 110 by brazing can be as follows: the second substrate 200 is disposed on one surface of the first substrate 100 so that the first terminal 121 and the sensing line L are in contact with each other; solder paste is applied to the portion where the first terminal 121 and the sensing line L are in contact; and then the first substrate 100 and the second substrate 200 are exposed to a heated space such as an oven for a predetermined time, or hot air is applied to the portion where solder paste was applied. In this way, since the brazed portion 110 can be formed simultaneously on multiple first substrates 100 and second substrates 200, the mass production rate can be improved.

[0077] In this invention, the connection method between the first terminal 121 and the sensing line L is not limited to the brazing method described above. However, methods can exist that use a conductive film to form a joint or use ultrasonic welding or laser welding to form a welded part to electrically connect the first terminal 121 and the sensing line L to each other and form a first electrical connection. Here, a conductive film refers to a film capable of electrically connecting two components to which the film is attached, and as an example of a conductive film, an anisotropic conductive film (hereinafter referred to as ACF) may exist. After the ACF is placed between the two components to be electrically connected, the joint is formed into a first electrical connection by pressurizing and heating the stacked two components and the ACF, thereby electrically connecting the two different components. A detailed method of using ACF in this invention will then be described.

[0078] Figure 4 The following is a schematic illustration of an embodiment of the present invention. Figure 3 The side of the sensing component is shown in the image.

[0079] like Figure 4 As shown, the second substrate 200 included in the sensing component according to an embodiment of the present invention is formed of an FPCB and can be flexibly bent or folded. Therefore, when the sensing component according to the present invention is applied to a battery cell stack, even if assembly errors occur, stress will not be concentrated on the second substrate 200. Thus, the sensing component can be easily applied to the battery cell stack without worrying about damaging the second substrate 200 or other components.

[0080] like Figure 3 As shown, one end of the sensing leg 300 can be electrically connected to a second terminal 122 formed on a surface of the first substrate 100 via a second electrical connection portion. Here, the sensing leg 300 is a terminal capable of sensing the voltage or temperature of the battery cell, and can also be referred to as a sensing terminal, sensor terminal, etc. Furthermore, when the sensing leg 300 is included in the battery module, it can also be configured to connect to a busbar for sensing the cell voltage. In this invention, the sensing leg 300 can be formed from an FPCB, just like the second substrate 200. In this invention, the sensing leg 300 is formed from an FPCB, which allows for a certain degree of assembly when the sensing component is connected to the battery module, thus preventing damage to the sensing leg 300 even if external force is applied, and giving the sensing leg 300 strength to resist accidental impacts and vibrations from the outside.

[0081] The method for forming a second electrical connection portion for electrically connecting the sensing leg 300 and the second terminal 122 can be a brazing method, similar to the method for forming the first electrical connection portion between the first substrate 100 and the second substrate 200 in this embodiment. However, in this invention, the method for electrically connecting the sensing leg 300 to the second terminal of the first substrate 100 is not limited to brazing, and a conductive film can be used to form the joint, or ultrasonic welding or laser welding can be used to form the joint. After one surface of the sensing leg 300 also faces one surface of the first substrate 100, at least one of brazing, conductive film, ultrasonic welding, and laser welding can be used to form the second electrical connection portion to electrically connect the sensing leg 300 and the first substrate 100 to each other, thereby increasing the bonding force between the sensing leg 300 and the first substrate 100.

[0082] The sensing line formed on the second substrate 200, the first terminal 121 and the second terminal 122 formed on the first substrate 100, and the sensing leg 300 of the present invention can be electrically connected to each other, and the voltage, temperature, etc. of the battery cell can be sensed through such electrical connection.

[0083] Figure 5 Only the sensing leg 300 is shown.

[0084] like Figure 5 As shown, a fuse portion can be formed on the sensing leg 300. This fuse portion can be a wire and can be patterned and printed on the sensing leg 300. The fuse portion can be formed such that the width of one end 311 and the other end 312 of the wire is thinner than the width of the intermediate portion 313 connecting the one end and the other end. One of the one end 311 and the other end 312 of the wire can be a portion connected to the second terminal 122 of the first substrate 100, and the other can be a portion connected to a busbar. The reason why the width of the intermediate portion 313 is thinner than the width of one end 311 and the other end 312 of the wire is that when an overcurrent flows through the fuse portion, the intermediate portion 313 is disconnected. The intermediate portion 313 can have a repeating, continuous S-shaped bend. The fuse portion can be electrically connected to the sensing line L of the second substrate 200.

[0085] The welding of the other end of the sensing leg 300 to the busbar and the brazing for connecting the first substrate 100 and the second substrate 200 can share important parts of the process, thus improving convenience and economic feasibility when manufacturing the sensing component according to the embodiment of the present invention.

[0086] When the method for electrically connecting the first substrate 100 and the second substrate 200 of the present invention is other than soldering, by replacing the same method of electrically bonding the first substrate 100 and the sensing leg 300 with the method of electrically bonding the first substrate 100 and the second substrate 200 to each other, even if a method other than soldering is used, the convenience and economic feasibility of manufacturing the sensing component according to the embodiment of the present invention can be improved.

[0087] Figures 6A to 6C Two conventional methods of connecting the sensing leg to the substrate are illustrated schematically, as well as the connection of the sensing leg in the sensing assembly according to an embodiment of the present invention, in order to explain in more detail why the sensing leg 300 is formed by an FPCB. Figure 6A and Figure 6B The method shown is a conventional method, and Figure 6C This is the method according to this embodiment.

[0088] First of all, Figure 6A In the method shown, after a hole is made in the RPCB 40, one end of a metal sensing leg 50 made of metal is inserted into the hole, and the circuitry printed on the printed circuit board 40 is electrically connected to the metal sensing leg 50 by soldering. Here, the metal sensing leg 50 can typically be made of copper. Figure 6A The method shown requires the process of forming individual holes in the RPCB 40, and stress can be applied to the metal sensing leg 50 when assembly errors occur, potentially damaging it. Furthermore, the metal sensing leg 50 is typically manufactured using a mold. To apply the sensing assembly to battery cell stacks of different specifications, the metal sensing leg 50 applied to each battery cell stack also needs to be manufactured to different specifications, thus requiring molds of various sizes. Typically, remanufacturing a mold is costly, therefore... Figure 6A The method shown is not economical, and the metal sensing leg 50 manufactured in this way is not versatile.

[0089] Figure 6B The method shown is to connect the metal sensing leg 50 to the RPCB 40 by soldering after placement, without machining holes in the RPCB 40. Figure 6A Compared to the method shown, this method improves manufacturing convenience and economic feasibility by omitting the process of machining holes in the RPCB 40. However, as with Figure 6A The method shown has the potential to damage the metal sensing leg 50 due to assembly errors, and also has the problem of lack of universality.

[0090] On the other hand, because Figure 6CThe sensing leg 300 of the present invention shown is formed by an FPCB instead of a metal such as copper. Therefore, when only a certain length of sensing leg 300 is formed, the sensing leg 300 can be applied to a battery module including battery cell stacks of various sizes, and even if assembly errors occur, no stress (or a certain degree or less of stress) will be applied to the sensing leg 300. Therefore, the sensing leg is unlikely to be damaged and can be easily assembled into the battery cell stack.

[0091] Figure 7 This is an exploded perspective view of a battery module according to an embodiment of the present invention.

[0092] like Figure 7 As shown, a battery module according to an embodiment of the present invention may include a battery cell stack 22, a busbar connecting member 23, and a sensing component 1000, and may further include a top cover 21, a first side cover 24, and a second side cover 25. Among the above components, the sensing component 1000 is the same as the sensing component described above according to the present invention. Therefore, the sensing component 1000 may include a first substrate 100, a second substrate 200, and a sensing leg 300, and a detailed description of the sensing component 1000 will be omitted. Among the components included in the battery module according to an embodiment of the present invention, the components other than the sensing component 1000 are the same as those described in the background description of the present invention.

[0093] Hereinafter, a method for manufacturing a sensing component according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0094] A method for manufacturing a sensing component according to an embodiment of the present invention may include steps a) and b). In step a), a pair of first substrates 100 are arranged to be spaced apart from each other, each first substrate having at least one first terminal 121 formed on one surface, and in step b), a sensing line L is formed, a second substrate formed of a flexible circuit board is disposed between the first substrates 100, and the sensing line L is electrically connected to the first terminal 121 to form a first electrical connection portion.

[0095] As described above, the first electrical connection is formed using various methods such as brazing, conductive film, ultrasonic welding, and laser welding, and can electrically connect the sensing line L to the first terminal 121. A method for electrically connecting the sensing line L and the first terminal 121 using brazing has already been described, and in this embodiment, a connection method using an ACF as a conductive film will be described.

[0096] Figure 8 This illustrates the state in step b) where an ACF 60 is disposed between a first substrate 100 on which a first terminal 121 is formed, and a second substrate 200 on which a sensing line L is formed. In step b) of this embodiment, when... Figure 8When the first substrate 100, ACF 60, and second substrate 200 are stacked as shown, the following is obtained: Figure 9 In the state shown, after the moving strip heating device 70 is oriented towards the stacked portion, a joint formed by the ACF 60 is formed by pressurizing and heating the stacked portion of the first terminal 121, ACF 60, and sensing line L to a predetermined pressure or greater, thereby electrically connecting the first terminal 121 and sensing line L to each other. That is, in this embodiment, the joint formed by the ACF 60 is the first electrical connection. As described above, the electrical connection method using the ACF 60 has the advantages that the heating device 70 can be miniaturized and can be performed in a relatively confined space.

[0097] The method for manufacturing a sensing component according to an embodiment of the present invention may further include step c).

[0098] Figure 10 and Figure 11 The process of performing step c) of the method for manufacturing a sensing component according to an embodiment of the present invention is shown sequentially.

[0099] like Figure 10 As shown, in step c), one end of the sensing leg 300 formed by the FPCB is spaced apart from the first substrate 100, and the ACF 60 is disposed between the second terminal formed on the surface of the first substrate 100 and the sensing leg 300. Figure 11 The diagram shows the second terminal 122, ACF 60, and sensing leg 300 stacked on top of each other. Subsequently, in step c), a joint is formed by pressurizing and heating the stacked second terminal 122, ACF 60, and sensing leg 300 to a predetermined pressure or greater using a heating device 70. The joint formed by the above process becomes a second electrical connection for electrically connecting the second terminal 122 to the sensing leg 300. However, the present invention does not limit the process of forming the second electrical connection in step c) to the above embodiment, and in step c), similar to step b), a brazed portion using brazing, a welded portion using ultrasonic welding, or a laser weld can be formed to form the second electrical connection.

[0100] Step c) can be performed regardless of the order of steps a) and b) above. That is, after the sensing leg 300 is electrically connected to the first substrate 100, the first substrate 100 and the second substrate 200 can be electrically connected to each other.

[0101] According to the sensing component and battery module of the present invention as described above, the sensing leg of the busbar connected to the battery module to sense the voltage of the battery cell is formed by a flexible circuit board, thereby preventing the sensing leg from being damaged due to assembly steps or external forces.

[0102] In addition, because the fuse section is patterned on the sensing leg, it can reduce weight, simplify the manufacturing process and reduce manufacturing costs compared to the conventional method of setting a separate fuse.

[0103] Although the present invention has been described with reference to exemplary embodiments and accompanying drawings, the invention is not limited to the exemplary embodiments described above, and various modifications and changes can be made by those skilled in the art based on the above description. Therefore, the scope and spirit of the invention should be understood only by means of the appended claims, and all modifications equivalent to or related to the claims should fall within the scope and spirit of the invention.

Claims

1. A sensing component, comprising: A first substrate, formed of a rigid printed circuit board, includes at least one first terminal and at least one second terminal on one surface; The second substrate is formed of a flexible printed circuit board and includes at least one sensing line electrically connected to the first terminal; as well as The sensing leg has one end electrically connected to the second terminal and includes a fuse portion configured to disconnect when an overcurrent flows. The fuse portion is patterned on the sensing leg and integrally formed with the sensing leg, and The sensing leg is an independent component separate from the first substrate and the second substrate, and the other end of the sensing leg is connected to the busbar of the battery module. The sensing leg is formed of a flexible circuit board. One surface of the sensing leg makes surface contact with one surface of the first substrate to form an electrical connection portion, and is electrically connected to the second terminal through the electrical connection portion.

2. The sensing component according to claim 1, wherein, The fuse part is a wire printed on the sensing leg, and The width of one end and the other end of the wire is greater than the width of the middle portion connecting the one end and the other end of the wire.

3. The sensing component according to claim 2, wherein, The middle section has a curved shape.

4. The sensing component according to claim 1, further comprising: A first electrical connection portion is disposed between one end of the second substrate and the first substrate, and electrically connects the sensing line to the first terminal; as well as The second electrical connection portion is disposed between one end of the sensing leg and the first substrate, and electrically connects the fuse portion and the second terminal.

5. The sensing component according to claim 4, wherein, At least one of the first electrical connection portion and the second electrical connection portion is a brazed portion formed by brazing.

6. The sensing component according to claim 4, wherein, At least one of the first electrical connection portion and the second electrical connection portion is a joint portion joined by a conductive film.

7. The sensing component according to claim 4, wherein, At least one of the first electrical connection portion and the second electrical connection portion is a welded portion welded by laser welding or ultrasonic welding.

8. A battery module, comprising: A battery cell stack, wherein the battery cell stack is formed by multiple battery cells; A busbar connecting member, which is connected to both sides of the battery cell stack; as well as A sensing component, connected to the busbar connection member, is provided to sense the voltage of the battery cell. The sensing component includes: A first substrate, formed of a rigid printed circuit board, includes at least one first terminal and at least one second terminal on one surface; A second substrate, formed of a flexible printed circuit board, includes at least one sensing line electrically connected to the first terminal; and The sensing leg has one end electrically connected to the second terminal and includes a fuse portion configured to disconnect when an overcurrent flows. The fuse portion is patterned on the sensing leg and integrally formed with the sensing leg, and The sensing leg is a separate component from the first substrate and the second substrate, and the other end of the sensing leg is connected to the busbar. The sensing leg is formed of a flexible circuit board. One surface of the sensing leg makes surface contact with one surface of the first substrate to form an electrical connection portion, and is electrically connected to the second terminal through the electrical connection portion.

9. The battery module according to claim 8, wherein, The fuse part is a wire printed on the sensing leg, and The width of one end and the other end of the wire is greater than the width of the middle portion connecting the one end and the other end of the wire.

10. The battery module according to claim 9, wherein, The middle section has a curved shape.

11. The battery module according to claim 8, further comprising: A first electrical connection portion is disposed between one end of the second substrate and the first substrate, and electrically connects the sensing line to the first terminal; as well as The second electrical connection portion is disposed between one end of the sensing leg and the first substrate, and electrically connects the fuse portion and the second terminal.

12. The battery module according to claim 11, wherein, At least one of the first electrical connection portion and the second electrical connection portion is a brazed portion formed by brazing.

13. The battery module according to claim 11, wherein, At least one of the first electrical connection portion and the second electrical connection portion is a joint portion joined by a conductive film.

14. The battery module according to claim 11, wherein, At least one of the first electrical connection portion and the second electrical connection portion is a welded portion welded by laser welding or ultrasonic welding.

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