CN111527640B

CN111527640B - Battery pack

Info

Publication number: CN111527640B
Application number: CN201880077794.8A
Authority: CN
Inventors: 尹澈重; 孙基硕; 安宰必; 梁承佑
Original assignee: Samsung SDI Co Ltd
Current assignee: Samsung SDI Co Ltd
Priority date: 2017-12-11
Filing date: 2018-10-01
Publication date: 2023-07-28
Anticipated expiration: 2038-10-01
Also published as: WO2019117436A1; KR102152885B1; KR20190069128A; CN111527640A

Abstract

According to the present invention, a battery pack is disclosed. The battery pack includes: the battery cell is connected with the signal input unit for acquiring the state information; a wiring substrate for collecting state information of the battery cell; and a sensing unit including an input port coupled to the signal input unit, an output port coupled to the wiring substrate to output state information of the battery cell, and a connection part between the input port and the output port, the coupling unit between the signal input unit and the input port including: a welding part; a first adhesive part coated on an outer surface of the welding part; and a second adhesive portion surrounding an outside of the first adhesive portion. The present invention includes a battery pack having an improved coupling structure between an input point and a battery cell to increase electrical reliability with respect to the input point at which an electrical signal related to state information of the battery cell is input.

Description

Battery pack

Technical Field

The present disclosure relates to a battery pack.

Background

In general, a secondary battery refers to a battery that can be repeatedly charged and discharged unlike a primary battery that is not rechargeable. Secondary batteries are used as energy sources for devices such as mobile devices, electric vehicles, hybrid electric vehicles, electric bicycles, and uninterruptible power supplies. Depending on the type of device employing the secondary battery, a single unit secondary battery or a plurality of unit secondary batteries (battery packs) each including a plurality of units connected to each other are used.

A small-sized mobile device such as a cellular phone may operate for a predetermined time using a single unit secondary battery. However, a battery pack having high output, high capacity characteristics may be suitable for devices (such as electric vehicles and hybrid electric vehicles) having a long operation time and consuming a large amount of power. The output voltage or the output current of the battery pack may be increased by adjusting the number of battery cells included in the battery pack.

Disclosure of Invention

Technical problem

Embodiments of the present disclosure include a battery cell having an improved coupling structure between the battery cell and an input part such that the input part to which an electrical signal related to state information about the battery cell is input may be highly electrically reliable.

Technical proposal

A battery pack, the battery pack comprising:

the signal input part is connected to the battery cell and used for acquiring state information;

a wiring board configured to collect state information of the battery cell; and

a sensing part including an input port coupled to the signal input part, an output port coupled to the wiring board and through which state information of the battery cell can be output, and a connection part between the input port and the output port,

wherein, the joint portion between signal input part and the input port includes:

a welding area;

a first adhesive part applied to an outer surface of the welding region; and

and a second adhesive portion surrounding an outer periphery of the first adhesive portion.

Advantageous effects

The present disclosure provides a battery pack in which conductive connection parts electrically connected to battery cells are doubly surrounded to be protected from an external harmful environment and to improve electrical reliability, thereby preventing an electrical signal related to the state information of the battery cells from being distorted due to an increase in resistance of the conductive connection parts or degradation of the conductive connection parts when the state information of the battery cells is collected through the conductive connection parts and a charge-discharge operation of the battery cells is controlled based on the collected state information.

Drawings

Fig. 1 is an exploded perspective view illustrating a battery pack according to an embodiment of the present disclosure.

Fig. 2 is an exploded perspective view illustrating a portion of the battery pack shown in fig. 1.

Fig. 3 is a plan view illustrating a portion of the battery pack shown in fig. 1.

Fig. 4 is an exploded perspective view illustrating a portion of fig. 3.

Fig. 5 is an exploded perspective view showing a coupling structure of the sensing part.

Fig. 6 and 7 are cross-sectional views taken along line VI-VI of fig. 5 for illustrating a coupling structure of the sensing part.

Fig. 8 is an exploded perspective view illustrating the sensing part shown in fig. 4.

Best mode for carrying out the invention

A battery pack, the battery pack comprising:

a wiring board configured to collect state information of the battery cell; and

a sensing portion comprising: an input port coupled to the signal input; an output port coupled to the wiring board and through which state information of the battery cell can be output; and a connection portion between the input port and the output port,

a welding area;

a first adhesive part applied to an outer surface of the welding region; and

For example, the welding region may be doubly surrounded by the first bonding portion and the second bonding portion.

For example, the first adhesive portion may be formed by curing a liquid adhesive.

For example, the second adhesive portion may be formed of a solid adhesive.

For example, the second adhesive portion may include a double-sided tape.

For example, the signal input part and the input port may be bonded together to face each other in a state where the second adhesive part attached along the edge of the input port is between the signal input part and the input port.

For example, the second adhesive portion may be between the signal input portion and the input port, and may continuously surround the periphery of the bonding region.

For example, the first bonding portion may be filled in a filling region between the bonding region and the second bonding portion.

For example, an injection hole may be formed in the input port to allow injection of the liquid adhesive for forming the first adhesive portion.

For example, the injection hole may include slits formed in parallel with each other along mutually facing sides of the input port.

For example, the first adhesive portion may also be formed on an upper surface of the input port, the upper surface facing away from the land.

For example, the first and second adhesive portions may be electrically insulating.

For example, the weld may be an ultrasonic weld.

For example, an indent can be formed in the upper surface of the input port, opposite the weld zone, by an ultrasonic horn.

For example, the signal input part may be a bus bar configured to electrically connect adjacent battery cells to each other, and

the voltage signal of the battery cell may be input to an input port coupled to the bus bar.

Detailed Description

The battery pack will now be described with reference to the accompanying drawings, in which preferred embodiments are shown.

Fig. 1 is an exploded perspective view illustrating a battery pack according to an embodiment of the present disclosure. Fig. 2 is an exploded perspective view illustrating a portion of the battery pack shown in fig. 1. Fig. 3 is a plan view illustrating a portion of the battery pack shown in fig. 1.

Referring to the drawings, the battery pack of the present disclosure includes: a battery cell B; the frames F that are disposed together with the battery cells B in one direction (hereinafter, also referred to as a direction Z1) and are coupled to each other to face each other with the battery cells B therebetween; and a wiring board C disposed on the frame F to collect state information about the battery cells B.

The battery cells B may be arranged in one direction (direction Z1). In addition, the frames F may be arranged together with the battery cells B in the direction (direction Z1) in such a manner that the frames F are coupled to each other with the battery cells B therebetween. For example, the frames F may be arranged in the direction (direction Z1) in such a manner that each battery cell B is placed between the adjacent frames F, and the adjacent frames F are coupled to each other to face each other.

Each frame F may define a receiving part FA surrounding and extending along the periphery of the battery cell B to receive the battery cell B. More specifically, the frame F may extend along the periphery of the battery cell B while crossing the upper, lower, and lateral sides of the battery cell B. The frame F may include: a housing portion FA as an inner region for housing the battery cell B; and a support FS as an outer region on which objects electrically connected to the battery cells B, such as the bus bar 15 and the wiring board C, are supported. For example, the support FS may be formed on a portion of the frame F that spans across the upper side of the battery cell B, on which the electrode 10 is formed. The frame F may have an inner side surrounding the battery cell B and an outer side forming the support FS, thereby providing a support base for objects (such as the bus bar 15 and the wiring board C) electrically connected with the battery cell B.

The frames F may be arranged in the direction (hereinafter, also referred to as a direction Z1) in such a manner that each battery cell B is placed between the adjacent frames F, which are coupled to each other to face each other. In other words, all the battery cells B are surrounded by the frames F arranged front and rear in the direction (direction Z1), and the frames F arranged front and rear surround the outer sides of the battery cells B positioned between the frames F, so that the frames F can form the appearance of the battery pack covering the battery cells B and can serve as a case protecting the battery cells B. In the battery pack including the battery cells B, the array of the frame F in the direction (direction Z1) may substantially form the external appearance of the battery pack, and the battery cells B may be placed inside the array of the frame F and surrounded by the frame F.

The frames F and the battery cells B may be alternately arranged in the direction (hereinafter, also referred to as a direction Z1), each of the frames F may include different receiving parts FA that receive the adjacent battery cells B, for example, each of the frames F may include different receiving parts FA that receive the different battery cells B arranged in front and rear of the direction (direction Z1), and the different receiving parts FA may be separated from each other by a blocking wall W. In the frame F, the blocking wall W may be placed between different receiving parts FA to separate the receiving parts FA from each other, and may isolate different battery cells B from electrical and thermal interference.

Each of the battery cells B may be connected to a bus bar 15 for electrical connection with an adjacent battery cell B, and a wiring board C may be connected to the battery cell B to obtain and collect state information (such as voltage information or temperature information) about the battery cell B. In this case, the bus bar 15 and the wiring board C may be objects that form an electrical connection with the battery cell B, and such objects may be supported on the support portion FS of the frame F.

The support portion FS of the frame F may include a bus bar support portion FSB on which the bus bar 15 is supported and a board support portion FSC on which the wiring board C is supported. The bus bar support FSB and the board support FSC may be disposed at different positions of the support FS. For example, the bus bar support FSB may be provided on a left peripheral portion or a right peripheral portion of the frame F corresponding to the electrode 10 of the battery cell B. The board support FSC may be provided on a central portion of the frame F. The wiring board C supported on the board support FSC may be located at the center position of the battery cell B such that the wiring board C can easily collect state information from a plurality of positions of the battery cell B. The sensing parts S may be connected to the wiring board C to transmit state information from the sides of the battery cells B, and since the wiring board C is placed at a central position, distances between the wiring board C and the sensing parts S connected to the plurality of positions of the wiring board C may be substantially uniform and balanced so that resistances of the sensing parts S connected to the plurality of positions may be balanced to prevent signal distortion.

The bus bar support FSB and the board support FSC may have different widths. For example, the bus bar support FSB may be relatively narrow in order not to interfere with the electrical connection between the bus bar 15 and the battery cell B (in particular, the electrode 10 of the battery cell B). The bus bar support FSB may support front and rear ends of the bus bars 15 placed on both sides of the bent portion 15a of the bus bar 15, and may insulate the adjacent bus bars 15 from each other. The bus bar support FSB may support both ends of the bus bar 15 and may electrically insulate the adjacent bus bars 15 from each other so that both ends of the bus bar 15 may not contact the ends of the adjacent bus bars 15. The bus bar support FSB does not need to be in physical contact with both end portions of the bus bars 15 as long as the bus bar support FSB is placed between the adjacent bus bars 15 and electrically insulates the adjacent bus bars 15 from each other. Since it is sufficient that the bus bar support FSB is placed between the bus bars 15 adjacent to each other to prevent electrical contact between the bus bars 15, the bus bar support FSB may have a relatively small width so as not to reduce the conductive area between the bus bars 15 and the electrodes 10 of the battery cell B. When the bus bar support FSB has a large width like the plate support FSC, electrical contact between the bus bar 15 and the battery cell B (particularly, the electrode 10 of the battery cell B) may be blocked, the conductive area between the bus bar 15 and the battery cell B may be reduced, increasing the resistance of the overall charge-discharge path and reducing the electrical output power of the battery pack.

The bus bar support FSB may be disposed at left and right peripheral positions of the support FS corresponding to the electrode 10 disposed on the left side and the electrode 10 disposed on the right side of the battery cell B in the width direction of the battery cell B. The frames F may be arranged in the direction (direction Z1) in a left-right reversed pattern, in which case the bus bar support FSB may be arranged in the direction (direction Z1) along the left and right edges in a pattern that alternates along the left and right edges. For example, the bus bar support FSB may be provided on the left or right side of the board support FSC provided at the center position of the frame F, and since the frame F is arranged in a left-right reversed pattern in the direction (direction Z1), the bus bar support FSB may be arranged on the left and right sides of the board support FSC in the direction (direction Z1).

The board support FSC has a relatively large width so that the wiring board C can be stably placed and supported on the board support FSC. The wiring board C may be placed on the board support portion FSC of each frame F, and the board support portions FSC of the frames F may be connected to each other in the direction (direction Z1) to form a support surface extending widely in the direction (direction Z1), thereby providing a support base for supporting the wiring board C. That is, while the board support portion FSC of the frame F supports the wiring board C, the board support portions FSC of the frame F may be connected to each other in the direction (direction Z1) to form a support surface extending widely in the direction (direction Z1), and thus a support base for stably supporting the wiring board C may be provided.

The bus bars 15 serve to electrically connect the battery cells B adjacent to each other, and the bus bars 15 may connect the battery cells B to each other in series, in parallel, or in series-parallel. The bus bar 15 may electrically connect the battery cells B to each other by electrically bonding the electrodes 10 of the battery cells B. More specifically, the bus bar 15 may connect the battery cells B in parallel with each other by connecting the electrodes 10 having the same polarity of the battery cells B, or may connect the battery cells B in series with each other by connecting the electrodes 10 having different polarities of the battery cells B.

The bus bar 15 may be disposed to face the electrodes 10 disposed on the upper surface of the battery cell B, and may electrically connect the electrodes 10 of the battery cell B to each other. More specifically, both sides of the bus bar 15 may be directed to and coupled to the electrode 10 of the battery cell B based on the bent portion 15a provided at the central position of the bus bar 15. A plurality of bus bars 15 may be provided, and each bus bar 15 may connect the electrodes 10 of a pair of adjacent battery cells B.

The board support portion FSC may be placed at a central position between the bus bar support portions FSB provided at the left and right peripheral portions. The wiring board C may be placed on the board support FSC. The wiring board C may include a plurality of conductive patterns (not shown) to collect state information about the battery cells B and transmit the state information to a battery management system (not shown). The wiring board C may be connected to the bus bars 15 for electrically coupling the battery cells B to each other, and obtain information about the voltage of the battery cells B. Although not shown in the drawings, the wiring board C may be connected to a thermistor (not shown) placed on the upper surface of the battery cell B to obtain information about the temperature of the battery cell B.

The wiring board C may collect state information (e.g., voltage information and temperature information) from the battery cell B, and may transmit the state information to a separate battery management system (not shown), so that the separate battery management system (not shown) may control the charge-discharge operation of the battery cell B, or may control the charge-discharge operation of the battery cell B through the battery management system provided together with the wiring board C.

Referring to fig. 3, the flexible sensing part S may be connected to the wiring board C as a medium for transmitting signals related to the battery cell state information. The sensing portion S may be provided in the form of a flexible deformable film. Each sensing part S may include an input port SI connected to a side of the battery cell B (e.g., the bus bar 15 electrically connected to the battery cell B), an output port SO connected to the wiring board C, and a connection part SC connecting the input port SI and the output port SO to each other.

The input port SI may correspond to a portion that receives state information from a side of the battery cell B (e.g., from the bus bar 15 electrically connected to the battery cell B), and the output port SO may correspond to a portion through which state information about the battery cell B is output to the wiring board C. The connection portion SC connecting the input port SI and the output port SO to each other may be formed in a curved shape in which a plurality of portions are overlapped with each other.

The input port SI of the sensing part S may be connected to the side of the battery cell B. More specifically, the input port SI of the sensing part S may be connected to the bus bar 15 that electrically connects the battery cells B adjacent to each other, and the voltage signal of the battery cell B may be received from the bus bar 15 through the input port SI. Although not shown in the drawings, according to another embodiment of the present disclosure, the input port SI may be connected to a thermistor (not shown) placed on the upper surface of the battery cell B, and a temperature signal of the battery cell B may be received from the thermistor (not shown) through the input port SI. In this view, the input port SI of the sensing part S may be considered to be connected to a signal input part for acquiring state information about the battery cell B. The signal input part may be connected to the battery cell B for acquiring state information such as voltage or temperature of the battery cell B, and may be, for example, a bus bar 15 electrically connected to the battery cell B or a thermistor (not shown) thermally connected to the battery cell B.

Each connection portion SC connecting the input port SI and the output port SO to each other may be formed in a curved shape in which a plurality of portions are overlapped with each other. The battery pack may include frames F facing each other and coupled with each other with the battery cells B therebetween in the direction in which the battery cells B are arranged (direction Z1). During the charge-discharge operation of the battery cell B, the battery cell B may undergo swelling (i.e., swelling) in the direction (direction Z1), in which case the frames F coupled one after the other with the battery cell B therebetween in the direction (direction Z1) may slide in the direction (direction Z1) and conform to the deformation caused by the swelling of the battery cell B.

As described above, when the battery cell B swells and expands in the direction (direction Z1), the frame F may move in the direction (direction Z1), and thus the relative positions of the input port SI coupled to the bus bar 15 placed on the frame F and the output port SO coupled to the wiring board C may become further away from each other in the direction (direction Z1). In this case, the connection SC connecting the input port SI and the output port SO may be deformed to conform to the deformation in the direction (direction Z1). In this case, since the connection portion SC has a curved shape in which a plurality of portions are overlapped with each other, the connection portion SC can be easily deformed according to the relative positions of the input port SI and the output port SO that move away from each other due to swelling, and thus stress can be less accumulated in the connection portion SC.

The output port SO of the sensing part S may be connected to a pad (not shown) of the wiring board C, and an electrical signal transmitted through the output port SO of the sensing part S may reach a conductive pattern (not shown) of the wiring board C via the pad (not shown) of the wiring board C. The output port SO of the sensing part S may be soldered or soldered to a pad (not shown) of the wiring board C, or may be bonded to the pad of the wiring board C using a conductive adhesive or the like.

In fig. 1, reference numerals E and 210 refer to end blocks and end plates, respectively. The end block E and the end plate 210 may be placed on the outer side of the outermost battery cell B to provide a fastening force for physically restraining the battery cell B of the battery pack.

Fig. 4 is an exploded perspective view illustrating a portion of fig. 3. Fig. 5 is an exploded perspective view showing a coupling structure of each sensing part. Fig. 6 and 7 are cross-sectional views taken along line VI-VI of fig. 5 for illustrating a coupling structure of the sensing part.

Referring to the drawings, an input port SI of the sensing part S and a signal input part (e.g., a bus bar 15 electrically connected to the battery cell B) may be coupled to each other, thereby forming a coupling part CP. The junction CP between the input port SI and the bus bar 15 includes a welding region WD as a conductive junction, and thus a voltage signal can be transmitted from the bus bar 15 to the sensing portion S through the input port SI. In addition, the first and second adhesive portions A1 and A2 may be formed around the welding region WD of the input port SI. More specifically, in a state in which the input port SI is superimposed on the bus bar 15, the input port SI and the bus bar 15 may be ultrasonically welded together by a welding method by pressing an ultrasonic horn UH having a plurality of protruding tips against the input port SI and applying ultrasonic vibration to the input port SI through the ultrasonic horn UH. The first and second adhesive portions A1 and A2 may be formed to sequentially surround the outer periphery of the welding region WD. For example, the first adhesive portion A1 may be formed of a liquid adhesive, and the second adhesive portion A2 may be formed of a solid adhesive. The welding region WD is doubly surrounded by the first adhesive portion A1 and the second adhesive portion A2, and thus the first adhesive portion A1 and the second adhesive portion A2 may have a function of protecting the welding region WD. For example, the first and second bonding parts A1 and A2 doubly surround the welding region WD to insulate the welding region WD from an external harmful environment such as moisture or oxygen, thereby preventing degradation of the welding region WD such as oxidation and an increase in resistance of the welding region WD.

In other words, the joint CP between the input port SI and the bus bar 15 may include the welding region WD, the first adhesive portion A1 applied to the outer surface of the welding region WD, and the second adhesive portion A2 surrounding the outer periphery of the first adhesive portion A1. Here, the welding region WD corresponds to a conductive bonding portion for electrical connection between the input port SI and the bus bar 15, and the first and second adhesive portions A1 and A2 serve to protect the welding region WD by doubly surrounding the welding region WD, and may correspond to an insulating bonding portion that does not form a conductive bond.

The first adhesive part A1 may be prepared in a liquid state and may be injected onto the welding region WD to be coated on the outer surface of the welding region WD. More specifically, an injection hole IH may be formed in the input port SI to inject a liquid adhesive therethrough, thereby forming the first adhesive part A1. For example, a plurality of injection holes IH may be formed in the input port SI such that the liquid adhesive injected through the injection holes IH may be uniformly applied to the outer surface of the welding region WD, and the injection holes IH may be formed at symmetrical positions such that the first adhesive portion A1 may be uniformly applied to the outer surface of the welding region WD. More specifically, the injection hole IH may be formed in a slit shape along an edge of the input port SI, and may extend parallel to each other along a pair of sides of the input port SI facing each other.

After the input port SI and the bus bar 15 are welded together, a liquid adhesive may be injected through the injection hole IH of the input port SI to apply the liquid adhesive to the outer surface of the welding zone WD formed between the input port SI and the bus bar 15, and then the liquid adhesive is cured to form the first adhesive portion A1. As described above, the first adhesive portion A1 may be formed after the welding of the input port SI. The first adhesive portion A1 may be formed by injecting a liquid adhesive to uniformly apply the liquid adhesive to the outer surface of the welding region WD, and the first adhesive portion A1 may cover the welding region WD while being filled in the filling region FF defined by the second adhesive portion A2. The first adhesive portion A1 may be applied to an outer surface of the welding region WD to protect the welding region WD, and may be formed of an insulating adhesive having no conductivity. The first adhesive portion A1 may be formed using a conductive adhesive instead of using an insulating adhesive. However, in this case, it may be necessary to more tightly control the adhesive injection process to prevent electrical shorting with surrounding components.

The second adhesive portion A2 may form a temporary bond between the input port SI and the bus bar 15 before welding, and furthermore, since the second adhesive portion A2 is formed of a solid adhesive, even in a welding process such as an ultrasonic welding process, the shape of the second adhesive portion A2 may be maintained to maintain the temporary bond between the input port SI and the bus bar 15. For example, the input port SI may be superimposed on the bus bar 15, at which time the input port SI may be bonded to the bus bar 15 with the second adhesive portion A2 therebetween, so that the input port SI and the bus bar 15 may be temporarily bonded to each other through the second adhesive portion A2. As described above, when the welding process is performed in a state where the input port SI and the bus bar 15 are temporarily bonded together, the welding position between the input port SI and the bus bar 15 is not shifted, the positional alignment between the input port SI and the bus bar 15 is not disturbed even during the ultrasonic welding process in which ultrasonic vibration is applied, and the welding position between the input port SI and the bus bar 15 can be maintained. Since the second adhesive portion A2 is formed in a solid state, the shape of the second adhesive portion A2 can be maintained and the temporary bonding between the input port SI and the bus bar 15 can be stably maintained despite the repeated external force such as ultrasonic vibration. The second adhesive portion A2 may be formed of a solid adhesive so as to maintain its shape even under an ultrasonic vibration environment, for example, a double-sided tape may be provided as the second adhesive portion A2.

The second adhesive portion A2 may be attached along an edge between the input port SI and the bus bar 15. More specifically, the second adhesive portion A2 may be attached along the edge of the input port SI to surround the periphery of the welding region WD to be formed between the input port SI and the bus bar 15. That is, the second adhesive part A2 and the welding region WD may be separated from each other by a filling region FF formed therebetween, and the first adhesive part A1 may be formed in the filling region FF between the second adhesive part A2 and the welding region WD. That is, since the second adhesive part A2 is formed along the edge of the input port SI, the filling region FF may be formed between the second adhesive part A2 and the welding region WD formed at the center position of the input port SI, and the first adhesive part A1 may be formed by injecting a liquid adhesive into the filling region FF. The second adhesive portion A2 defines a filling area FF in which the liquid adhesive is filled to form the first adhesive portion A1, and since the second adhesive portion A2 serves as a barrier, the liquid adhesive may not leak to a position outside the input port SI. For example, the first adhesive part A1 may be filled in the filling region FF between the second adhesive part A2 and the welding region WD while being guided by the second adhesive part A2 around the periphery of the first adhesive part A1, and since the second adhesive part A2 prevents the first adhesive part A1 from leaking from the filling region FF, the first adhesive part A1 may be formed to a sufficient height in the filling region FF to cover the welding region WD.

The second adhesive portion A2 may be continuously formed along the periphery between the input port SI and the bus bar 15. That is, since the second adhesive portion A2 continuously surrounds the periphery of the welding region WD formed between the input port SI and the bus bar 15, the filling region FF may be formed in a closed state between the welding region WD and the second adhesive portion A2, and thus the liquid adhesive filled in the filling region FF to form the first adhesive portion A1 may be trapped by the second adhesive portion A2 to prevent leakage of the liquid adhesive. In this regard, the second adhesive portion A2 may be continuously formed along the edge of the input port SI, and since the second adhesive portion A2 is continuously formed along the periphery of the first adhesive portion A1, it is possible to prevent the leakage of the liquid adhesive forming the first adhesive portion A1, thereby clearly limiting the formation range of the first adhesive portion A1.

The second adhesive portion A2 disposed between the input port SI and the bus bar 15 may be a solid adhesive having a shock absorbing property so that the temporary bond between the input port SI and the bus bar 15 can be maintained even when the ultrasonic horn UH pressed against the input port SI applies vibration. For this purpose, a double-sided tape may be provided as the second adhesive portion A2. Since the input port SI and the bus bar 15 are conductively coupled to each other through the welding region WD, the second adhesive portion A2 surrounding and protecting the welding region WD may form an insulating coupling between the input port SI and the bus bar 15. When the second adhesive part A2 to which the ultrasonic vibration is applied is formed as a conductive bond, more strict process control may be required to prevent an electrical short circuit with surrounding components.

The input port SI and the bus bar 15 may be combined with each other in the order described below. First, the input port SI is superimposed on the bus bar 15, and at this time, the second adhesive portion A2 is arranged between the input port SI and the bus bar 15 to temporarily bond the input port SI and the bus bar 15 to each other. In addition, ultrasonic welding is performed by applying ultrasonic vibration to the bus bar 15 and the input port SI temporarily bonded together. At this time, the ultrasonic horn UH is pressed against the upper surface of the input port SI to apply ultrasonic vibration, and thus a weld zone WD may be formed between the input port SI and the bus bar 15 while a dent is formed in the upper surface of the input port SI by the ultrasonic horn UH. Here, the upper surface of the input port SI may refer to a surface of the input port SI opposite to the welding region WD, and a dent may be formed in the upper surface of the input port SI due to ultrasonic welding. Next, a liquid adhesive may be injected through the injection hole IH of the input port SI to form a first adhesive portion A1 applied to the outer surface of the welding region WD.

When the liquid adhesive is injected to form the first adhesive part A1, the liquid adhesive may be applied to the upper surface of the input port SI, and the liquid adhesive applied to the input port SI may permeate into the region between the input port SI and the bus bar 15 through the injection hole IH of the input port SI, and then permeate into the filling region FF between the second adhesive part A2 and the welding region WD, thereby covering the welding region WD. Due to the injection hole IH formed in the input port SI, the liquid adhesive (first adhesive part A1) may permeate into the filling region FF and cover the welding region WD by a simple method of applying the liquid adhesive (first adhesive part A1) to the upper surface of the input port SI, and the liquid adhesive (first adhesive part A1) may not leak to a position outside the input port SI but may have a height sufficient to cover the welding region WD due to the second adhesive part A2 attached along the edge of the input port SI. That is, the second adhesive portion A2 may define the formation position of the first adhesive portion A1, and may serve as a dam trapping the liquid adhesive forming the first adhesive portion A1 in the filling region FF while preventing the liquid adhesive from leaking to a position outside the input port SI.

For example, a portion of the first adhesive portion A1 remaining after the first adhesive portion A1 fills the filling region FF between the welding region WD and the second adhesive portion A2 may be located on the upper surface of the input port SI. In this regard, the first adhesive portion A1 may be considered to be on the upper surface of the input port SI in addition to being in the filling region FF between the input port SI and the signal input portion (e.g., the bus bar 15 electrically connected to the battery cell B). Here, the upper surface of the input port SI may refer to a surface of the input port SI opposite to the welding region WD, and the first adhesive portion A1 may also be formed on the upper surface of the input port SI.

Referring to fig. 4, the input port SI of the sensing part S may be coupled to a portion of the bus bar 15 placed on the coupling support CB, and the portion of the bus bar 15 may be a portion supported at a relatively high level by the coupling support CB. The bonding between the input port SI and the bus bar 15 may be physically supported by the bonding support CB, and the portion of the bus bar 15 bonded to the input port SI may be supported at a relatively high level, so that when the input port SI and the bus bar 15 are ultrasonically welded to each other and the first and second adhesive parts A1 and A2 are formed, interference with other components may be reduced, thereby making it easy to perform the bonding process. For example, each of the coupling supporters CB may be formed on the bus bar supporting part FSB, and may be formed integrally with the bus bar supporting part FSB.

Referring to the drawings, the sensing part S may include: a lead S10 for transmitting a signal related to information about the state of the battery cell B; and an insulating film S20 in which the wire S10 is buried to insulate the wire S10. For example, the wire S10 may be a copper foil pattern, and the insulating film S20 may be arranged to bury the wire S10 inside the insulating film S20 so that an electric signal may be isolated from the outside while being transmitted through the wire S10.

As described above, the injection hole IH is formed in the input port SI of the sensing part S to inject the liquid adhesive forming the first adhesive part A1 through the injection hole IH. The injection hole IH may be formed in the conductive line S10, and the insulating film S20 may cover the conductive line S10 in which the injection hole IH is formed, thereby providing the input port SI in which the injection hole IH is formed. Accordingly, the outer periphery of the injection hole IH may be surrounded by the insulating film S20, and since the insulating film S20 blocks the flow of the liquid adhesive (the liquid adhesive corresponding to the first adhesive portion A1), the liquid adhesive (the liquid adhesive corresponding to the first adhesive portion A1) remaining on the outer periphery of the injection hole IH may not flow to the surrounding components.

The present disclosure has been described, for illustrative purposes only, with reference to the embodiments shown in the drawings, it will be appreciated by those skilled in the art that various modifications and other embodiments may be made thereto. Accordingly, the scope and spirit of the present disclosure should be defined by the appended claims.

Industrial applicability

The present disclosure may be applied to a battery pack as a rechargeable energy source, and may be applied to various devices using the battery pack as a power source.

Claims

1. A battery pack, the battery pack comprising:

a wiring board configured to collect state information of the battery cell; and

a sensing portion comprising: an input port coupled to the signal input part and including an injection hole; an output port coupled to the wiring board and outputting state information of the battery cell through the output port; and a connection portion between the input port and the output port,

a welding area;

a first adhesive part applied to an outer surface of the welding region; and

a second adhesive portion surrounding the outer periphery of the first adhesive portion,

wherein a liquid adhesive for forming the first adhesive portion is injected to an outer surface of the welding zone through the injection hole.

2. The battery pack according to claim 1, wherein the welding region is doubly surrounded by the first and second adhesive parts.

3. The battery pack according to claim 1, wherein the first adhesive portion is formed by curing a liquid adhesive.

4. The battery pack according to claim 1, wherein the second adhesive portion is formed of a solid adhesive.

5. The battery pack according to claim 4, wherein the second adhesive part comprises a double-sided adhesive tape.

6. The battery pack according to claim 1, wherein the signal input part and the input port are coupled to face each other in a state in which the second adhesive part, which is attached along the edge of the input port, is located between the signal input part and the input port.

7. The battery pack according to claim 1, wherein the second adhesive portion is located between the signal input portion and the input port and continuously surrounds the outer periphery of the welding zone.

8. The battery pack according to claim 1, wherein the first adhesive part is filled in a filling region between the welding region and the second adhesive part.

9. The battery pack according to claim 1, wherein the injection hole includes slits formed in parallel with each other along sides of the input port facing each other.

10. The battery pack of claim 1, wherein the first adhesive portion is also formed on an upper surface of the input port, the upper surface facing away from the welding zone.

11. The battery pack of claim 1, wherein the first and second adhesive portions are electrically insulating.

12. The battery pack of claim 1, wherein the weld zone is an ultrasonic weld zone.

13. The battery of claim 1, wherein the indent is formed in an upper surface of the input port, the upper surface facing away from the weld zone, by an ultrasonic horn.

14. The battery pack according to claim 1, wherein the signal input part is a bus bar configured to electrically connect adjacent battery cells to each other, and

the voltage signal of the battery cell is input to an input port coupled to the bus bar.