CN111527640A

CN111527640A - Battery pack

Info

Publication number: CN111527640A
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: 2020-08-11
Anticipated expiration: 2038-10-01
Also published as: WO2019117436A1; CN111527640B; KR20190069128A; KR102152885B1

Abstract

According to the present invention, a battery pack is disclosed. The battery pack includes: the battery monomer is connected with the signal input unit for acquiring the state information; a wiring substrate for collecting state information of the battery cells; 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 sensing unit including a connection part between the input port and the output port, the combining unit between the signal input unit and the input port including: welding the part; a first adhesive part coated on an outer surface of the welding part; and a second adhesive part surrounding the outside of the first adhesive part. 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. The secondary battery is used as an energy source 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 cells connected to each other are used.

A small-sized mobile device such as a cellular phone can 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) that have a long operation time and consume a large amount of electric 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 pack having an improved coupling structure between a battery cell and an input part such that the input part to which an electrical signal related to state information on the battery cell is input may be highly electrically reliable.

Technical scheme

A battery pack, comprising:

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

a wiring board configured to collect state information of the battery cells; 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 portion and the input port includes:

a welding zone;

a first adhesive portion applied to an outer surface of the land; and

and a second adhesive part surrounding the outer circumference of the first adhesive part.

Advantageous effects

The present disclosure provides a battery pack in which a conductive connection part conductively connected to a battery cell is doubly surrounded to be protected from an external harmful environment and to improve electrical reliability, thereby preventing an electrical signal related to state information of the battery cell from being distorted due to an increase in resistance of the conductive connection part or degradation of the conductive connection part, when the state information of the battery cell is collected through the conductive connection part and a charge-discharge operation of the battery cell 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 showing a part of fig. 3.

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

Fig. 6 and 7 are 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, comprising:

a sensing portion comprising: an input port coupled to the signal input section; 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,

a welding zone;

a first adhesive portion applied to an outer surface of the land; and

For example, the weld region may be doubly surrounded by the first adhesive portion and the second adhesive 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 adhesive tape.

For example, 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, the signal input part and the input port may be bonded together to face each other.

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 land.

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

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

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 adhesive portion and the second adhesive portion may be electrically insulating.

For example, the weld zone may be an ultrasonic weld zone.

For example, an indentation may be formed in the upper surface of the input port, which is 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, a battery pack of the present disclosure includes: a battery cell B; frames F arranged with the battery cells B in one direction (hereinafter, also referred to as a direction Z1), and 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 status information on the battery cells B.

The battery cells B may be arranged in one direction (direction Z1). In addition, the frame 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: an accommodating part FA as an inner region accommodating the battery cell B; and a support portion FS as an outer area on which objects (such as the bus bar 15 and the wiring board C) electrically connected to the battery cells B are supported. For example, the support FS may be formed on a portion of the frame F that spans 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 portion 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 direction Z1) in such a manner that each battery cell B is placed between 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 back and forth in the direction (direction Z1), the frames F arranged back and forth being placed around the outer sides of the battery cells B 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 for protecting the battery cells B. In a battery pack including the battery cells B, an array of frames F in the direction (direction Z1) may substantially form the appearance of the battery pack, and the battery cells B may be placed inside the array of frames F and surrounded by the frames F.

The frames F and the battery cells B may be alternately arranged in the direction (hereinafter, also referred to as the 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 different battery cells B arranged back and forth in the direction (the direction Z1), and the different receiving parts FA may be separated from each other by the blocking wall W. In the frame F, the barrier wall W may be placed between the different receiving parts FA to separate the receiving parts FA from each other, and may isolate the different battery cells B from electrical and thermal interference.

Each battery cell B may be connected to a bus bar 15 for electrical connection with an adjacent battery cell B, and the wiring board C may be connected to the battery cell B to obtain and collect status 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 electrical connections with the battery cells B, and such objects may be supported on the support sections FS of the frame F.

The support section FS of the frame F may include a bus bar support section FSB on which the bus bar 15 is supported and a board support section FSC on which the wiring board C is supported. The bus bar supporting part FSB and the board supporting part FSC may be disposed at different positions of the supporting part FS. For example, the bus bar support part FSB may be disposed on a left or right peripheral portion of the frame F corresponding to the electrode 10 of the battery cell B. The board support portion FSC may be provided on a central portion of the frame F. The wiring board C supported on the board support part FSC may be located at the center position of the battery cell B, so that the wiring board C can easily collect the 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 the center 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 may be 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 supporting part FSB and the plate supporting part FSC may have different widths. For example, the bus bar support part FSB may be relatively narrow in order not to interfere with the electrical connection between the bus bar 15 and the battery cell B (particularly, the electrode 10 of the battery cell B). The bus bar support part FSB may support the front and rear end parts of the bus bar 15 placed on both sides of the bent part 15a of the bus bar 15, and may insulate the adjacent bus bars 15 from each other. The bus bar support part 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 part FSB does not need to be in physical contact with both ends of the bus bar 15 as long as the bus bar support part 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 part 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 part FSB may have a relatively small width so as not to reduce a conductive area between the bus bars 15 and the electrodes 10 of the battery cells B. When the bus bar support part FSB has a large width like the plate support part FSC, electrical contact between the bus bar 15 and the battery cell B (particularly, the electrode 10 of the battery cell B) may be hindered, a conductive area between the bus bar 15 and the battery cell B may be reduced, resistance of the overall charge-discharge path is increased, and electrical output power of the battery pack is reduced.

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

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

The bus bar 15 is used to electrically connect the battery cells B adjacent to each other, and the bus bar 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 coupling 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 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 surfaces of the battery cells B, and may electrically connect the electrodes 10 of the battery cells B to each other. More specifically, both sides of the bus bar 15 may be directed to and coupled to the electrodes 10 of the battery cells B based on the bent portions 15a provided at the center positions 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 part FSC may be placed at a central position between the bus bar support parts FSB provided at the left and right peripheral portions. The wiring board C may be placed on the board support part FSC. The wiring board C may include a plurality of conductive patterns (not shown) to collect status information on the battery cells B and transmit the status information to a battery management system (not shown). The wiring board C may be connected to a bus bar 15 for electrically coupling the battery cells B to each other, and obtain information on 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 on the temperature of the battery cell B.

The wiring board C may collect status information (e.g., voltage information and temperature information) from the battery cells B, and may transmit the status 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 cells B, or may control the charge-discharge operation of the battery cells B by a battery management system provided together with the wiring board C.

Referring to fig. 3, a flexible sensing part S may be connected to the wiring board C as a medium for transmitting a signal related to the cell state information. The sensing portion S may be provided in the form of a flexible deformable membrane. 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 the 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 the state information about the battery cell B is output to the wiring board C. The connection part 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 a side surface 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 cells 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) disposed on an 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 on the battery cell B. The signal input part may be connected to the battery cell B for acquiring state information such as a voltage or a 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 part 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 and coupled to 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., expansion) in the direction (direction Z1), in which case the frames F coupled to each other back and forth with the battery cell B therebetween in the direction (direction Z1) may slide in the direction (direction Z1) and conform to 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 farther 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 part SC has a curved shape in which a plurality of portions are overlapped with each other, the connection part SC may be easily deformed according to the relative positions of the input port SI and the output port SO that they are moved away from each other due to swelling, and thus stress may be less accumulated in the connection part SC.

The output port SO of the sensing part S may be connected to a pad (not shown) of the wiring board C, and the 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 section S may be welded 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 an end block and an end plate, 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 showing a part of fig. 3. Fig. 5 is an exploded perspective view illustrating a coupling structure of each sensing part. Fig. 6 and 7 are 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 the land WD as a conductive junction, and thus a voltage signal may be transmitted from the bus bar 15 to the sensing part S through the input port SI. In addition, the first and second adhesive parts a1 and a2 may be formed around the weld WD of the input port SI. More specifically, in a state in which the inlet port SI is superimposed on the bus bar 15, the inlet port SI and the bus bar 15 may be welded together by an ultrasonic welding method by pressing an ultrasonic horn UH having a plurality of protruding tips against the inlet port SI and applying ultrasonic vibration to the inlet port SI through the ultrasonic horn UH. The first and second adhesive portions a1 and a2 may be formed to sequentially surround the periphery of the weld WD. For example, the first adhesive part a1 may be formed of a liquid adhesive, and the second adhesive part a2 may be formed of a solid adhesive. The weld 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 weld WD. For example, the first and second adhesive portions a1 and a2 doubly surround the weld WD to insulate the weld WD from an external harmful environment such as moisture or oxygen, thereby preventing degradation of the weld WD such as oxidation and an increase in resistance of the weld WD.

In other words, the joint CP between the input port SI and the bus bar 15 may include the weld WD, the first adhesive portion a1 applied to the outer surface of the weld WD, and the second adhesive portion a2 surrounding the outer circumference of the first adhesive portion a 1. Here, the land 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 bonding portions a1 and a2 serve to protect the land WD by doubly surrounding the land WD, and may correspond to an insulating bonding portion where no conductive bonding is formed.

The first adhesive portion a1 may be prepared in a liquid state, and may be injected onto the weld zone WD to coat an outer surface of the weld zone 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 a 1. 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 land WD, and the injection holes IH may be formed at symmetrical positions such that the first adhesive part a1 may be uniformly applied to the outer surface of the land 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 in parallel with each other along a pair of mutually facing sides of the input port SI.

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 weld 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 part a 1. 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 weld WD, and the first adhesive portion a1 may cover the weld WD while being filled in the filling region FF defined by the second adhesive portion a 2. The first adhesive portion a1 may be applied to an outer surface of the weld WD to protect the weld 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. In this case, however, the adhesive injection process may need to be more tightly controlled to prevent electrical shorting with surrounding components.

The second adhesive part a2 may form a temporary bond between the input port SI and the bus bar 15 before welding, and furthermore, since the second adhesive part a2 is formed of a solid adhesive, the shape of the second adhesive part a2 may be maintained to maintain the temporary bond between the input port SI and the bus bar 15 even in a welding process such as an ultrasonic welding process. For example, the input port SI may be superimposed on the bus bar 15, and at this time, the input port SI may be coupled 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 coupled to each other by the second adhesive portion a 2. As described above, when the welding process is performed in the state where the input port SI and the bus bar 15 are temporarily joined 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 the 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 despite repeated external force such as ultrasonic vibration, and the temporary bonding between the input port SI and the bus bar 15 can be stably maintained. The second adhesive part a2 may be formed of a solid adhesive so as to maintain its shape even under an ultrasonic vibration environment, and for example, a double-sided tape may be provided as the second adhesive part a 2.

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 an edge of the input port SI to surround the periphery of the weld WD to be formed between the input port SI and the bus bar 15. That is, the second adhesive portion a2 and the land WD may be separated from each other by a filling region FF formed therebetween, and the first adhesive portion a1 may be formed in the filling region FF between the second adhesive portion a2 and the land WD. That is, since the second bond a2 is formed along the edge of the input port SI, a filling region FF may be formed between the second bond a2 and the weld area WD formed at the center position of the input port SI, and the first bond a1 may be formed by injecting a liquid adhesive into the filling region FF. The second adhesive portion a2 defines a filling region 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 portion a1 may be filled in a filling region FF between the second adhesive portion a2 and the land WD while being guided by the second adhesive portion a2 around the periphery of the first adhesive portion a1, and the first adhesive portion a1 may be formed in the filling region FF to a sufficient height for covering the land WD since the second adhesive portion a2 prevents the first adhesive portion a1 from leaking from the filling region FF.

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 part a2 continuously surrounds the periphery of the weld area WD formed between the input port SI and the bus bar 15, the filling region FF may be formed in a sealed state between the weld area WD and the second adhesive part a2, and thus the liquid adhesive filled in the filling region FF to form the first adhesive part a1 may be trapped by the second adhesive part a2 to prevent leakage of the liquid adhesive. In this regard, the second adhesive part a2 may be continuously formed along the edge of the input port SI, and since the second adhesive part a2 is continuously formed along the periphery of the first adhesive part a1, it is possible to prevent the liquid adhesive forming the first adhesive part a1 from leaking, thereby clearly limiting the formation range of the first adhesive part a 1.

The second adhesive portion a2 disposed between the inlet port SI and the bus bar 15 may be a solid adhesive having shock-absorbing properties such that the temporary bonding between the inlet port SI and the bus bar 15 may be maintained even when the ultrasonic horn UH pressed against the inlet port SI applies vibration. For this, a double-sided tape may be provided as the second adhesive portion a 2. Since the input port SI and the bus bar 15 are conductively bonded to each other by the lands WD, the second adhesive portion a2 surrounding and protecting the lands WD may form an insulating bond between the input port SI and the bus bar 15. When the second adhesive portion a2 to which ultrasonic vibration is applied is formed as an electrically conductive bond, stricter process control may be required to prevent electrical short circuits 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 disposed 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, the ultrasonic welding is performed by applying ultrasonic vibration to the bus bar 15 and the input port SI that are temporarily bonded together. At this time, the ultrasonic horn UH is pressed against the upper surface of the inlet port SI to apply ultrasonic vibration, and thus the weld zone WD may be formed between the inlet port SI and the bus bar 15 while the dent is formed in the upper surface of the inlet 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 weld WD, and a dent may be formed in the upper surface of the input port SI due to the ultrasonic welding. Next, a liquid adhesive may be injected through the injection hole IH of the input port SI to form the first adhesive portion a1 applied to the outer surface of the weld WD.

When the liquid adhesive is injected to form the first bonded 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 penetrate into a region between the input port SI and the bus bar 15 through the injection hole IH of the input port SI and then into the filling region FF between the second bonded part a2 and the land WD, thereby covering the land WD. Due to the injection hole IH formed in the input port SI, the liquid adhesive (first adhesive part a1) may penetrate into the filling region FF and cover the weld area WD by a method of simply 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 weld area 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 location of the first adhesive portion a1, and may serve as a dam trapping the liquid adhesive forming the first adhesive portion a1 in the fill region FF while preventing the liquid adhesive from leaking to a location 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 weld 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 considered to be in the fill 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 weld 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 portions a1 and a2 are formed, interference with other components may be reduced, thereby making it easy to perform the bonding process. For example, each coupling support CB may be formed on the bus bar support part FSB, and may be formed integrally with the bus bar support part FSB.

Referring to the drawings, the sensing part S may include: a wire S10 for transmitting a signal related to information on 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 conductive line S10 may be a copper foil pattern, and the insulating film S20 may be arranged to bury the conductive line S10 inside the insulating film S20, so that the electric signal may be isolated from the outside while being transmitted through the conductive line 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. An injection hole IH may be formed in the wire S10, and an insulating film S20 may cover the wire S10 having the injection hole IH formed therein, thereby providing an input port SI having the injection hole IH formed therein. Accordingly, the periphery of the injection hole IH may be surrounded by the insulating film S20, and the liquid adhesive (liquid adhesive corresponding to the first adhesive part a1) remaining on the periphery of the injection hole IH may not flow to the surrounding components because the insulating film S20 blocks the flow of the liquid adhesive (liquid adhesive corresponding to the first adhesive part a 1).

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

Industrial applicability of the invention

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, comprising:

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

a welding zone;

a first adhesive portion applied to an outer surface of the land; and

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

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 part 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 together to face each other in a state in which the second adhesive part 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 an outer circumference of the land.

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

9. The battery pack according to claim 1, wherein an injection hole is formed in the input port to allow injection of a liquid adhesive for forming the first adhesive part.

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

11. The battery pack according to claim 1, wherein the first adhesive part is also formed on an upper surface of the input port, the upper surface facing away from the land.

12. The battery pack according to claim 1, wherein the first adhesive part and the second adhesive part are electrically insulated.

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

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

15. 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.