CONNECTOR, BATTERY PACK, AND ELECTRICAL DEVICE

A connector including a first insulator and a second insulator disposed along a first direction, and a plurality of conductive pieces spaced apart between the first insulator and the second insulator. Each conductive piece includes a first connecting portion and a second connecting portion. Both the first connecting portion and the second connecting portion are configured to be connected to other conductive pieces. The second connecting portions of the plurality of conductive pieces are spaced apart along a second direction.

TECHNICAL FIELD

This application relates to the technical field of energy storage, and in particular, to a connector, a battery pack, and an electrical device.

BACKGROUND

In a battery, tabs of a plurality of battery cells are usually passed through a current collecting plate and connected to a sampling terminal on the current collecting plate to implement series connection of pouch cells, and are connected to the current collecting plate by a voltage sensing harness to collect voltage, thereby involving use of many materials and a high production cost.

SUMMARY

In view of the foregoing situation, it is necessary to provide a connector, a battery pack, and an electrical device to avoid the need of a current collecting plate, a sampling terminal, and a voltage sensing harness, and reduce the number of materials that need to be used.

An embodiment of this application provides a connector. The connector includes a first insulator and a second insulator disposed along a first direction, and a plurality of conductive pieces spaced apart from each other are disposed between the first insulator and the second insulator. Each conductive piece includes a first connecting portion and a second connecting portion. Both the first connecting portion and the second connecting portion are configured to be connected to other conductive pieces. The second connecting portions of the plurality of conductive pieces are spaced apart along a second direction.

One conductive piece is connected to other conductive pieces by the first connecting portion and the second connecting portion, thereby avoiding the need of a current collecting plate, a sampling terminal, and a voltage sensing harness, and reducing the number of materials that need to be used.

Further, in some embodiments of this application, the second direction is perpendicular to the first direction.

Further, in some embodiments of this application, the third connecting portion includes a third connecting sub-portion. The third connecting sub-portion is bent toward a side of the first insulator along the second direction. The third connecting sub-portion is connected to the second connecting portion. The bent third connecting sub-portion increases the distance between the adjacent second connecting portions, reduces the risk of a short circuit caused by the touch between the adjacent second connecting portions, and facilitates welding between the second connecting portion and the circuit board.

Further, in some embodiments of this application, the first insulator is provided with a plurality of first openings. The second insulator is provided with a plurality of second openings. along the first direction, a projection of the plurality of first openings at least partially overlaps with a projection of the plurality of second openings.

Further, in some embodiments of this application, the projection of the plurality of second openings is located inside the projection of the plurality of first openings along the first direction. By reducing the open area of the second opening, this application reduces the risk of a short circuit caused by an object dropped onto the second surface located at the second opening.

Further, in some embodiments of this application, the first connecting portion includes a first connecting region and a first extending region. The first connecting region is located inside one of the plurality of first openings when viewed along the first direction. The first connecting region is located inside one of the plurality of second openings when viewed along a direction opposite to the first direction. The first extending region extends outward from a periphery of the first connecting region. The first extending region is located between the first insulator and the second insulator.

Further, in some embodiments of this application, the connector further includes a third insulator. The third insulator is connected to a side of the second insulator, the side being oriented away the first insulator. Along the first direction, a projection of the third insulator overlaps a projection of the third connecting portion and/or the second connecting portion. With the third insulator being connected to a plurality of second connecting portions, this application reduces the possibility of deformation of the plurality of second connecting portions and increases the structural strength of the connector. With the third insulator being connected to the third connecting portion, this application further increases the structural strength of the connector and reduces the possibility of deformation of the connector.

Further, in some embodiments of this application, along the first direction, the projection of the third insulator covers the projection of the third connecting sub-portion.

Further, in some embodiments of this application, along the first direction, the projection of the third insulator covers a part of the projection of the second connecting portion.

Further, in some embodiments of this application, along the first direction, the third connecting portion includes a second region. The second region is connected to the third connecting sub-portion. Along the first direction, the projection of the third insulator overlaps the projection of the second region. This further increases the structural strength of the connector and reduces the possibility of deformation of the connector.

Further, in some embodiments of this application, at least one of the third connecting portions includes a first region. The first region extends to a position between two adjacent first connecting portions along the second direction, thereby increasing the structural strength of the connector, and reducing the possibility of bending of the connector along the second direction.

An embodiment of this application further provides a battery pack. The battery pack includes a housing assembly, a cell module, and the connector according to any one of the embodiments described above. The cell module is disposed inside the housing assembly and connected to the connector.

Further, in some embodiments of this application, the cell module includes a plurality of battery cells stacked along a third direction. Each battery cell includes a cell housing, an electrode assembly disposed in the cell housing, and an electrode terminal connected to the electrode assembly and led out of the cell housing. The first connecting portion is connected to the electrode terminal.

Further, in some embodiments of this application, the third direction is perpendicular to both the first direction and the second direction.

Further, in some embodiments of this application, the electrode terminal includes a welding portion. Along the first direction, a projection of the welding portion is located inside a projection of the first connecting region. In this way, the welding portion is located inside the edge of the first connecting region, thereby making it convenient to weld the welding portion onto the first connecting region and improving the yield rate of welding.

Further, in some embodiments of this application, along the first direction, projections of electrode terminals of adjacent battery cells are spaced apart from each other, and the electrode terminals of adjacent battery cells are connected to each other by the first connecting portion.

Further, in some embodiments of this application, the cell housing includes a first part and a second part. The electrode assembly is disposed in the first part. The second part is connected to the first part. The electrode terminal protrudes from the second part. The first part coordinates with the second part to form a first recess. Along a direction opposite to the first direction, a projection of the third connecting portion is at least partially located inside the first recess, thereby reducing the space occupied by the connector.

Further, in some embodiments of this application, the battery pack further includes a fourth insulator. The fourth insulator is disposed in the first recess and located between adjacent electrode terminals.

The fourth insulator disposed reduces the risk of a short circuit between adjacent electrode terminals, facilitates placement of the connector, and alleviates vibration of the connector.

Further, in some embodiments of this application, the battery pack further includes a first structural component and a circuit board. The circuit board is connected to the first structural component. The circuit board comprises a plurality of first connecting holes, the first structural component is provided with a second recess. The third connecting portion is disposed in the second recess. The second connecting portion is disposed in the first connecting hole.

The position of the third connecting portion is defined by the second recess, thereby increasing the positioning precision during assembling, and facilitating assembling.

An embodiment of this application further provides an electrical device, including the battery pack disclosed in any one of the embodiments described above.

In the battery pack and the electrical device, one conductive piece is connected to other conductive pieces by the first connecting portion and the second connecting portion, thereby avoiding the need of a current collecting plate, a sampling terminal, and a voltage sensing harness, and reducing the number of materials that need to be used.

LIST OF REFERENCE NUMERALS

The following specific some embodiments are intended to describe this application in further detail with reference to the drawings.

DETAILED DESCRIPTION

The following describes the technical solutions in some embodiments of this application with reference to the drawings hereof. Evidently, the described some embodiments are merely a part of but not all of the embodiments of this application.

A component considered to be “disposed on” another component may be directly disposed on the other component or may be disposed on the other component through an intermediate component. A component considered to be “connected to” another component may be directly connected to the other component or may be connected to the other component through an intermediate component.

Unless otherwise defined, all technical and scientific terms used herein bear the same meanings as what is normally understood by a person skilled in the technical field of this application. The terms used in the specification of this application are merely intended to describe specific some embodiments but not to limit this application. The term “and/or” used herein is intended to include any and all combinations of one or more relevant items recited.

Understandably, when the two components are arranged parallel or perpendicular to each other, an angle may exist between the two components at a tolerance of 0% to ±5%. For example, when a tolerance of an angle between two vertically arranged components exists, one of the components tilts closer to or farther away from the other, and the tolerance of the angle between the two components is greater than 0° and less than or equal to 4.5°. When the projections of two elements are identical or overlap, a tolerance of 0 to ±10% is allowed between the two elements. For example, if the projected shape of one element is identical to that of another element, a tolerance of 0 to ±10% is allowed for the projected area.

The following describes some embodiments of this application in detail with reference to drawings. To the extent that no conflict occurs, the following some embodiments and the features in some embodiments may be combined with each other.

Referring toFIG.1,FIG.2, andFIG.3, an embodiment of this application provides a connector100, including a first insulator10, a second insulator20, and a plurality of conductive pieces30. The first insulator10and the second insulator20are disposed sequentially along a first direction X. The plurality of conductive pieces30are spaced apart from each other are disposed between the first insulator10and the second insulator20. Each conductive piece30includes a first connecting portion31and a second connecting portion32. Both the first connecting portion31and the second connecting portion32are configured to be connected to other conductive pieces. The second connecting portions32of the plurality of conductive pieces30are spaced apart along a second direction Y. In an embodiment, the second direction Y is perpendicular to the first direction X.

In an embodiment, the other conductive pieces include an electrode terminal of the battery cell. The first connecting portion31is at least partially configured to be connected to the electrode terminal. In an embodiment, the second connecting portion32is configured to be connected to the circuit board. In an embodiment, the conductive piece30is connected to the electrode terminal by the first connecting portion31, and connected to the circuit board by the second connecting portion32, so as to implement connection between the battery cell and the circuit board, and in turn, implement voltage collection, thereby avoiding the need of the sampling terminal and the voltage sensing harness and reducing the number of materials that need to be used.

In an embodiment, each conductive piece30further includes a third connecting portion33. The third connecting portion33connects the first connecting portion31and the second connecting portion32. The first insulator10and the second insulator20wrap the third connecting portion33, and are configured to insulate the third connecting portion33, reduce the material, and define the positions of the plurality of conductive pieces30, thereby reducing the risk of a short circuit caused by the contact of the plurality of conductive pieces30.

In an embodiment, the first insulator10and the second insulator20is flexible and can reduce the pulling of other conductive pieces such as the electrode terminal in a case of vibration, thereby reducing the risk of detachment of the electrode terminal from the first connecting portion31.

In an embodiment, the first insulator10is provided with a plurality of first openings11. The second insulator20is provided with a plurality of second openings21. Along the first direction X, a projection of the plurality of first openings11at least partially overlaps with a projection of the plurality of second openings21. The number of the first openings11is the same as the number of conductive pieces30. The number of the second openings21is the same as the number of conductive pieces30. Optionally, the projection of the first opening11completely overlaps the projection of the second opening21. The other conductive pieces are connected to the first connecting portion31through the first openings11and the second openings21. In an embodiment, the first connecting portion31includes a first connecting region31aand a first extending region31b.The first connecting region31ais located inside one of the plurality of a first openings11when viewed along the first direction X. The first connecting region31ais located inside one of the plurality of second openings21when viewed along a direction opposite to the first direction X. The first extending region31bis formed by extending the periphery of the first connecting region31aoutward. The first extending region31bis located between the first insulator10and the second insulator20, and is configured to connect the edges of the first opening11and the second opening21. The first connecting region31ais configured to be connected to other conductive pieces.

In an embodiment, along the first direction X, the projection of the plurality of second openings21is located inside the projection of the plurality of first openings11, and the open area of the second opening21is less than the open area of the first opening11. Along the first direction X, the first connecting region31aincludes a first surface311and a second surface312disposed opposite to each other. Viewed along the first direction X, the first surface311is located inside the first opening11. Viewed along a direction opposite to the first direction X, the second surface312is located inside the second opening21.

The first surface311is configured to be in contact with and connected to other conductive pieces. The second surface312serves as a surface on which an external welding device performs welding. Other conductive pieces are connected to the first surface311through the welding on the second surface312. The larger open area of the first opening11makes it convenient to connect other conductive pieces to the first surface311.

In an embodiment, at least one of the third connecting portions33includes a first region331. The first region331extends to a position between two adjacent first connecting portions31along the second direction Y, and is spaced apart from the two adjacent first connecting portions31, thereby increasing the structural strength of the connector100, and reducing the possibility of bending of the connector100along the second direction Y. In an embodiment, along the second direction Y, the two conductive pieces30located outermost each include a first region331. Each first region331extends to a position between the two adjacent conductive pieces30.

In an embodiment, at least a part of the third connecting portion33is bent toward a side of the first insulator10along the second direction Y, so as to increase the distance between the adjacent second connecting portions32, reduce the risk of a short circuit caused by the touch between the adjacent second connecting portions32, facilitate welding between the second connecting portion32and the circuit board, and reduce the impairment caused to the battery cell200aduring the welding.

In an embodiment, the third connecting portion33includes a third connecting sub-portion33a.The third connecting sub-portion33ais bent toward a side of the first insulator10along the second direction Y. The second connecting portion32is connected to the third connecting sub-portion33a.The second connecting portion32protrudes beyond the first insulator10and the second insulator20. A plurality of second connecting portions32are spaced apart along the second direction Y.

In an embodiment, the connector100further includes a third insulator40. The third insulator40is connected to a side of the second insulator20, the side being oriented away from the first insulator10. The third insulator40extends along the second direction Y.

In an embodiment, along the first direction X, the projection of the third insulator40partially overlaps the projection of the third connecting sub-portion33a, thereby reducing the possibility of connection between a foreign matter and the third connecting sub-portion33a.Optionally, along the first direction X, the projection of the third insulator40covers the projection of the third connecting sub-portion33a, thereby further enhancing the protection for the third connecting sub-portion33a.

In another embodiment, along the first direction X, the projection of the third insulator40overlaps the projection of the second connecting portion32, thereby increasing the structural strength of the connector100and reducing the possibility of deformation of the plurality of the second connecting portions32. Optionally, along the first direction X, the projection of the third insulator40covers the projections of the plurality of the second connecting portions32.

In an embodiment, along the first direction X, the projection of the third insulator40overlaps the projection of the third connecting portion33. Further, the third connecting portion33includes a second region332. The second region332is connected to the third connecting sub-portion33a.Along the first direction X, the projection of the third insulator40overlaps the projection of the second region332. This further increases the structural strength of the connector100and reduces the possibility of deformation of the connector100.

In an embodiment, a through-hole101, a third opening102, and a first bulge103are disposed on the connector100, and are configured to define the position of the connector100and facilitate connection. Understandably, one or more of the through-hole101, the third opening102, or the first bulge103may be disposed on the connector100, depending on the actual situation. Optionally, the third opening102and the first bulge103assume asymmetric structures, thereby allowing for anti-misassembly during assembling. Optionally, a protruding portion333is disposed on one of the conductive pieces30at the edge of the third opening102, thereby further facilitating positioning of the connector100during connection. Optionally, a protruding portion333is disposed on one of the conductive pieces30at the edge of the first bulge103, thereby further facilitating positioning of the connector100during connection.

In a process of manufacturing the connector100, a sheet material is stamped continuously by a piece of stamping equipment, so as to mold a plurality of conductive pieces30. Along the width direction of the sheet material, the sheet material that remains after the molding of the plurality of conductive pieces30includes a first connecting strip (not shown in the drawing) and a second connecting strip (not shown in the drawing). The first connecting strip and the second connecting strip are kept continuous along the length direction of the sheet material. The plurality of molded conductive pieces30are connected to the first connecting strip and the second connecting strip, so that the plurality of molded conductive pieces30are positioned between the first connecting strip and the second connecting strip. Subsequently, the first insulator10and the second insulator20are disposed to wrap a plurality of conductive pieces30along the first direction X separately to cut off the first connecting strip and the second connecting strip of the sheet material, so that the plurality of conductive pieces30are severed from each other, and the plurality of conductive pieces30are spaced out. In an embodiment, after the first connecting strip and the second connecting strip of the sheet material are cut off, some of the conductive pieces30are still connected to each other. In this case, the junction between two conductive pieces30as well as the first insulator10and the second insulator20that wrap the junction are stamped to sever the connection between the conductive pieces30and form a through hole101on the connector100.

Referring toFIG.4, this application further provides a battery pack1000, including a connector100, a cell module200, and a housing assembly300. The cell module200and the connector100are disposed inside the housing assembly300. The connector100is connected to the cell module200.

Referring toFIG.5andFIG.6, the cell module200includes a plurality of battery cells200astacked along the third direction Z. Each battery cell200aincludes a cell housing201, an electrode assembly (not shown in the drawing) disposed in the cell housing201, and an electrode terminal202connected to the electrode assembly and led out of the cell housing201. In an embodiment, the electrode assembly includes a jelly-roll structure formed by winding a positive electrode plate, a negative electrode plate, and a separator. In an embodiment, the third direction Z is perpendicular to the first direction X and the second direction Y. Optionally, the cell housing201includes an aluminum laminated film. Optionally, the battery cell200aincludes a pouch cell.

In an embodiment, a plurality of battery cells200aare stacked along the third direction Z. For example, when the cell module200includes 6 battery cells200a, 3 of the battery cells200aare stacked into a first group along the third direction Z, and the other 3 battery cells200aare stacked into a second group along the third direction Z. The first group and the second group are arranged along the second direction Y.

Referring toFIG.6andFIG.7, the cell housing201includes a first part201aand a second part201b.The first part201aaccommodates the electrode assembly, and the second part201bis connected to the first part201a.The electrode terminal202protrudes from the second part201b.

Referring toFIG.11together, in an embodiment, the plurality of battery cells200ainclude a first battery cell200a1. The first battery cell200a1is a battery cell located outermost along the third direction Z. Along the first direction X, a projection of the second connecting portion32is spaced apart from the projection of the cell housing201, thereby alleviating the impairment caused by the second connecting portion32to the cell housing201. Along the first direction X, the projection of the third connecting sub-portion33aoverlaps the projection of the cell housing201, thereby enhancing the protection for the cell housing201. Optionally, along the first direction X, the projection of the third connecting portion33ais connected to the projection of the second connecting portion32and the projection of the cell housing201, thereby further enhancing the protection for the cell housing201. The first part201acoordinates with the second part201bto form a first recess201c.Along a direction opposite to the first direction X, a projection of the third connecting sub-portion33ais at least partially located inside the first recess201c,thereby utilizing the space of the first recess201cand reducing the space occupied by the connector100.

Referring toFIG.8,FIG.9, andFIG.10, in some embodiments, the battery pack1000further includes a fourth insulator400. The fourth insulator400is disposed in the first recess201cand located between adjacent electrode terminals202. The fourth insulator400disposed reduces the risk of a short circuit between adjacent electrode terminals202, facilitates placement of the connector100, and alleviates vibration of the connector100. Optionally, the fourth insulator400includes foam.

Referring toFIG.5andFIG.10, in an embodiment, the electrode terminal202includes a welding portion202c.The welding portion202cis formed by bending the electrode terminal202, and is configured to be connected to the first connecting region31aof the first connecting portion31. The electrode terminals202of adjacent battery cells200aare bent toward each other and connected to the first connecting region31a.

In an embodiment, along the first direction X, a projection of the welding portion202cis located inside a projection of the first connecting region31a.The positioning of the welding portion202cmakes it convenient to weld the welding portion202conto the first connecting region31aand improves the yield rate of welding.

Referring toFIG.6andFIG.10, in an embodiment, the electrode terminal202includes a first terminal202aand a second terminal202b.The polarity of the first terminal202ais opposite to the polarity of the second terminal202b.Of the first terminal202aand the second terminal202b,one is a positive terminal, and the other is a negative terminal. In this embodiment, an example is described in which the first terminal202ais a positive terminal and the second terminal202bis a negative terminal. Along the first direction X, the projection of the first terminal202aof a battery cell200ais spaced apart from the projection of the second terminal202bof an adjacent battery cell200a.The welding portion202cof the first terminal202aand the welding portion202cof the second terminal202bface each other and are spaced out, and are connected by the first connecting portion31to implement series connection between the battery cells200a.Further, the welding portion202cis connected to the first connecting portion31by welding such as laser welding, ultrasonic welding, and the like. In some other embodiments, the welding portion202cmay be connected to the first connecting portion31by other means such as conductive adhesive. Spacing out the electrode terminals202of the adjacent battery cells200areduces the impairment caused to the battery cell200aduring the welding.

In some other embodiments, along the first direction X, the first terminal202aof the battery cell200amay be spaced apart from the projection of the first terminal202aof an adjacent battery cell200a,and the two first terminals may be connected by the first connecting portion31to implement parallel connection between the battery cells200a.

Referring toFIG.11, in another embodiment, along the first direction X, the projection of the first terminal202aof a battery cell200aat least partially overlaps the projection of the second terminal202bof an adjacent battery cell200a.The first terminal202aand the second terminal202bare bent toward each other. The welding portion202cof the first terminal202aand the welding portion of the second terminal202bare connected to each other by being stacked together. The welding portions202cof the adjacent battery cells200aare connected to each other. Therefore, to connect the welding portion202cto the first connecting region31a,only one welding operation needs to be performed, thereby reducing the processing operations.

In some other embodiments, the projection of the first terminal202aof the battery cell200amay at least partially overlap the projection of the first terminal202aof the adjacent battery cell200a,and the two first terminals may be connected by the first connecting portion31to implement parallel connection between the battery cells200a.

Referring toFIG.4andFIG.12, in an embodiment, the battery pack1000further includes a first structural component500. The first structural component500includes an accommodation portion501configured to accommodate the battery cell200a.The first structural component500includes a fourth opening502and a second recess503that communicate with each other. The fourth opening502extends along the second direction Y. The second recess503is recessed along a direction opposite to the first direction X. When the battery cell200ais placed in the accommodation portion501, the second connecting portion32passes through the fourth opening502, the third connecting sub-portion33ais partially disposed in the second recess503, and the third connecting sub-portion33aprotrudes beyond the first structural component500. The position of the third connecting portion33is defined by the second recess503, thereby increasing the positioning precision during assembling, and facilitating assembling.

Referring toFIG.4andFIG.13, in an embodiment, the battery pack1000further includes a circuit board600. The circuit board600may be a circuit board that includes a battery management system configured to intelligently manage and maintain each battery unit, reduce occurrences of overcharge and over discharge of the battery, prolong the lifespan of the battery, and monitor the status of the battery. The circuit board600includes a plurality of first connecting holes601. The second connecting portion32is disposed in the first connection hole601, and is fixed to the circuit board600by soldering, laser welding, or another welding method, so as to implement connection between the battery cell200aand the circuit board600. In an embodiment, the first connecting hole601corresponds to the position of the second connecting portion32. A part of the first connecting hole601extends along the second direction Y, and a part of the first connecting hole601extends along the first direction X. By extending a part of the first connecting hole601along the first direction X, the distance between adjacent first connecting holes601is increased along the second direction Y, thereby reducing the risk of a short circuit between the second connecting portions32disposed in adjacent first connecting holes601during assembling, and increasing the creepage distance.

Referring toFIG.4, in an embodiment, the circuit board600includes a second connecting hole602. The first structural component500includes a second bulge504. The second bulge504is disposed in the second connecting hole602, and is configured to mount the circuit board600to the first structural component500.

Referring toFIG.4andFIG.14, in an embodiment, the housing assembly300includes a first shell301and a second shell302. The first shell301is connected to the second shell302, so that the connector100, the cell module200, the first structural component500, and the circuit board600are accommodated in the first shell301and the second shell302.

In an embodiment, the first shell301includes a third bulge301a.The third bulge301ais in fit with and connected to the second bulge504to implement connection between the first shell301and the first structural component500. Further, the third bulge301ais disposed in the second bulge504. Glue is provided in the clearance between the third bulge301aand the second bulge504, so as to fix the first shell301and the first structural component500. With the third bulge301abeing in fit with and connected to the second bulge504, fewer screws are put in use, and the risk of the screws puncturing the battery cell200ais reduced.

In an embodiment, the third bulge301aincludes a fifth opening3011through which the third bulge301acan be filled with glue conveniently.

Referring toFIG.15, this application further provides an electrical device2000that employs the battery pack1000. In an embodiment, the electrical device2000of this application may be, but is not limited to, a portable fax machine, portable photocopier, portable printer, video recorder, liquid crystal display television set, handheld cleaner, transceiver, backup power supply, electric vehicle, electric motorcycle, an electric power-assisted bicycle, electric tool, large household storage battery, or the like.

In the connector100, the battery pack1000, and electrical device2000disclosed herein, a plurality of spaced conductive pieces30are disposed. Each conductive piece is connected to the electrode terminal202by the first connecting portion31, and connected to the circuit board600by the second connecting portion32, so as to implement connection between the battery cell200aand the circuit board600, and in turn, implement voltage collection, thereby avoiding the need of the current collecting plate, sampling terminal, and voltage sensing harness, reducing the number of materials that need to be used, and saving production cost. In contrast to a conventional method in which the tabs of a plurality of battery cells are passed through the current collecting plate and bent and connected to the sampling terminal on the current collecting plate, this application enables direct connection between the electrode terminal and the first connecting portion31, thereby reducing the assembling difficulty.

A person of ordinary skill in the art understands that the foregoing some embodiments are merely intended to illustrate this application, but not intended to limit this application. All appropriate modifications and changes made to some embodiments without departing from the spirit and conception of this application still fall within the protection scope of this application.