Battery pack and electric device

Abstract

The utility model discloses a battery pack which comprises a box body, a battery module and an exhaust device, an accommodating cavity is arranged in the box body, a flow channel is arranged in the box body, a heat exchange medium is arranged in the flow channel, and an inlet and an outlet for the heat exchange medium to enter and exit are arranged on the box body; the battery module is arranged in the accommodating cavity, the battery module comprises at least one battery cell, and the battery cell comprises a pressure relief mechanism; the exhaust device is arranged in the containing cavity in the third direction, the exhaust device comprises a shell and an exhaust cavity defined by the shell, the exhaust cavity is communicated with the pressure relief mechanism of the battery cell, and the exhaust cavity is communicated with the outside so as to discharge emissions to the outer side of the box body when the pressure relief mechanism is started. Therefore, the box body in the battery pack is provided with the flow channel, so that the cooling or heating efficiency of the battery pack can be improved, the condition of large temperature difference of the battery pack can be avoided, and the influence of temperature difference factors on the service life of the battery pack can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, concretely relates to a battery pack and electric device with the battery pack. BACKGROUND

[0002] In the technical field of electric vehicle battery, as the core component of energy storage and conversion, the battery has been widely used in the field of electric vehicles. However, the battery will generate a large amount of heat during use and when thermal runaway occurs, and if it cannot be cooled in time and effectively, it will affect the performance and service life of the battery and the safety of the battery use. In the prior art, a temperature control system for cooling is generally arranged at the bottom of the battery module. However, when the battery module is cooled by using such a temperature control system, since the temperature control system can only cool one side of the battery, the other sides completely rely on the battery itself for heat transfer, thereby easily causing the battery to form a temperature difference. The side of the battery close to the temperature control system cools quickly, and the effect of the temperature control system adjustment is more obvious. The side of the battery far away from the temperature control system cools slowly, and the effect of the temperature control system adjustment is poor. When the battery has a large temperature difference for a long time, the service life of the battery assembly will be affected.

[0003] Therefore, how to cool the battery in time and effectively is a technical problem to be solved by those skilled in the art. SUMMARY

[0004] Therefore, the utility model aims at providing a battery pack, which can solve the problem of low battery cooling efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A battery pack, comprising:

[0007] A box body is provided with a containing cavity inside, and a flow channel is arranged inside the box body. A heat exchange medium is arranged in the flow channel. An inlet and an outlet for the heat exchange medium to enter and exit are arranged on the box body.

[0008] A battery module is arranged in the containing cavity. The battery module comprises at least one battery cell, and the battery cell comprises a pressure relief mechanism.

[0009] An exhaust device is arranged in the containing cavity along a third direction. The exhaust device comprises a shell and an exhaust cavity surrounded by the shell. The exhaust cavity is in communication with the pressure relief mechanism of the battery cell, and the exhaust cavity is in communication with the outside to discharge the exhaust to the outside of the box body when the pressure relief mechanism is opened.

[0010] Optionally, in the battery pack, the box comprises a top cover, a bottom plate and a frame enclosing the accommodating cavity, and at least one of the top cover, the bottom plate and the frame is provided with the flow channel.

[0011] Optionally, in the battery pack, the battery module comprises at least one layer of cell groups arranged along the third direction, each layer of cell groups comprising at least one cell arranged along the second direction, and the pressure relief mechanism of the cell is arranged towards the exhaust device.

[0012] The shell is provided with an exhaust port at a position corresponding to the pressure relief mechanism, and the pressure relief mechanism is in communication with the exhaust cavity through the exhaust port.

[0013] Optionally, in the battery pack, along the first direction, the battery module comprises two groups of cell groups arranged symmetrically, and the pressure relief mechanisms of the cells in the two groups of cell groups are arranged oppositely, and the shell forms two exhaust cavities in communication with the pressure relief mechanisms of the two groups of cell groups, respectively.

[0014] Optionally, in the battery pack, the battery pack further comprises a first heat-conducting plate arranged on both sides of the cell group along the third direction and a second heat-conducting plate connected with the first heat-conducting plate at an angle, and the second heat-conducting plate is arranged on the side of the cell away from the pressure relief mechanism.

[0015] Optionally, in the battery pack,

[0016] The cell group and the first heat-conducting plate are connected through a heat-conducting member;

[0017] And / or, the cell group and the second heat-conducting plate are connected through a heat-conducting member;

[0018] And / or, the cell group and the box provided with the flow channel are connected through a heat-conducting member.

[0019] Optionally, in the battery pack, the flow channel comprises a plurality of branches arranged at intervals along the third direction, and the plurality of branches are in communication with each other.

[0020] Optionally, in the battery pack, the exhaust device further comprises a power device, and the power device is in communication with the exhaust cavity to discharge the exhaust to the outside of the box when the pressure relief mechanism is opened;

[0021] The shell is closed at both sides along the third direction and at an end away from the power device to seal the exhaust cavity;

[0022] When the shell forms two exhaust cavities, the two exhaust cavities are in communication at an end towards the power device.

[0023] Optionally, in the battery pack, the power device comprises a centrifuge.

[0024] To achieve the above object, the utility model provides the following technical scheme:

[0025] A kind of electric device, comprising the battery pack described above.

[0026] From the above technical scheme, the flow passage of the box in the battery pack of the utility model can improve the cooling or heating efficiency of the battery pack, can avoid the situation that the temperature difference of the battery pack is large, so as to avoid the influence of temperature difference factor on the service life of battery assembly, and the flow passage is arranged in the box, compared with the case of being arranged in the box, the space occupation size in the box can be reduced, in addition, the exhaust cavity is arranged, the thermal runaway protection performance of battery can be improved, and the safety of battery use is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0028] Figure 1 The structural diagram of the battery pack provided by the embodiment of the utility model is shown in the following figure:

[0029] Figure 2 The explosion diagram of the battery pack provided by the embodiment of the utility model is shown in the following figure:

[0030] Figure 3 The heat transfer direction of the battery pack provided by the embodiment of the utility model and the flow direction of the medium in the flow passage are shown in the following figure:

[0031] Figure 4 The cross-sectional view of the battery pack along the thickness direction provided by the embodiment of the utility model is shown in the following figure:

[0032] Figure 5 The cross-sectional view of the battery pack along the first direction provided by the embodiment of the utility model is shown in the following figure:

[0033] Figure 6 The partial cross-sectional view of the battery pack along the first direction provided by the embodiment of the utility model is shown in the following figure:

[0034] Figure 7 The schematic diagram of the cell gas exhaust into the exhaust cavity provided by the embodiment of the utility model is shown in the following figure: Figure 1

[0035] Figure 8 ​The utility model provides an electric core gas exhausts into the schematic diagram of exhaust chamber Figure 2 .

[0036] Among them:

[0037] 1, box body, 11, containing cavity, 12, top cover, 13, bottom plate, 14, frame,

[0038] 2, battery module, 21, electric core, 211, pressure relief mechanism,

[0039] 3, exhaust device, 31, shell, 311, exhaust port, 32, exhaust chamber, 33, power device,

[0040] 4, flow channel, 41, branch,

[0041] 5, import, 6, export, 7, first heat conduction plate, 8, second heat conduction plate. Specific embodiments

[0042] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0043] In the description of the utility model, it should be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer" is the orientation or position relationship shown in the drawing or the orientation or position relationship of the utility model product when it is usually placed, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0044] As Figures 1 to 8 shown, the utility model embodiments provide a kind of battery pack, can solve the problem of low battery heat dissipation efficiency.

[0045] Firstly, the battery pack comprises a box body 1, a battery module 2 and an exhaust device 3, wherein the box body 1 is internally provided with a containing cavity 11, the inside of the box body 1 is provided with a flow channel 4, the flow channel 4 is provided with a heat exchange medium, the box body 1 is provided with an inlet 5 and an outlet 6 for the heat exchange medium to enter and exit; the battery module 2 is arranged in the containing cavity 11, the battery module 2 comprises at least one battery cell 21, the battery cell 21 can be one, two or more, and the battery cell 21 comprises a pressure relief mechanism 211; the exhaust device 3 is arranged in the containing cavity 11 along a third direction, the exhaust device 3 comprises a shell 31 and an exhaust cavity 32 surrounded by the shell 31, the exhaust cavity 32 is communicated with the pressure relief mechanism 211 of the battery cell 21, and the exhaust cavity 32 is communicated with the outside to discharge the exhaust to the outside of the box body 1 when the pressure relief mechanism 211 is opened. Since the flow channel 4 is arranged inside the box body 1, the adaptability of the box body 1 is enhanced, and the arrangement of different batteries can be met. It should be noted that the specific number and arrangement mode of the battery cell 21 can be designed according to actual needs by those skilled in the art. When the battery cell 21 is in thermal runaway, the copper foil, aluminum foil and a large amount of heat inside the battery cell 21 will be discharged into the exhaust cavity 32 through the exhaust device 3. Since the exhaust cavity 32 is communicated with the outside, the gas discharged into the exhaust cavity 32 by the battery cell 21 will be discharged to the outside of the box body 1 through the exhaust cavity 32, thereby achieving the effect of cooling and preventing the remaining battery cells 21 from thermal runaway due to the high temperature inside the battery pack. It should be noted that the heat exchange medium can be water, air, organic liquid, refrigerant, etc., and the specific material of the heat exchange medium can be designed according to actual needs by those skilled in the art.

[0046] It can be seen that the box body 1 of the battery pack provided in the embodiment of the utility model can improve the cooling or heating efficiency of the battery pack, avoid the occurrence of a large temperature difference of the battery pack, and thus avoid the influence of the temperature difference on the service life of the battery assembly. Moreover, the flow channel 4 is arranged in the box body 1, which can reduce the space occupation size in the box body 1 compared with the case of being arranged inside the box body 1. In addition, the exhaust cavity 32 is arranged, which can improve the thermal runaway protection performance of the battery and improve the safety of the battery.

[0047] In specific implementation, the box body 1 comprises a top cover 12, a bottom plate 13 and a frame 14 surrounding the containing cavity 11, and at least one of the top cover 12, the bottom plate 13 and the frame 14 is provided with the flow channel 4. That is, the top cover 12 of the box body 1 is provided with the flow channel 4; or the bottom plate 13 is provided with the flow channel 4; or the frame 14 is provided with the flow channel 4, at this time, the flow channel 4 can be arranged in part of the frame 14 or all of the frame 14; or the top cover 12 and the bottom plate 13 are provided with the flow channel 4; or the top cover 12 and the frame 14 are provided with the flow channel 4; or the bottom plate 13 and the frame 14 are provided with the flow channel 4; or the top cover 12, the bottom plate 13 and the frame 14 are all provided with the flow channel 4. It should be noted that the box body 1 is usually a cuboid structure, and details are shown in the following figure. Figure 1But not limited to, the box 1 can also be cylindrical or other shapes, the specific shape of the box 1, those skilled in the art can be designed according to actual needs.

[0048] In particular implementation, the battery module 2 includes at least one layer of cell groups arranged along the third direction, each layer of cell groups includes at least one cell 21 arranged along the second direction, and the cells 21 in each layer of cell groups can be one, two or more. It should be noted that in the structure, the cell 21 arranged along the first direction in each layer of cell groups is limited to one; the pressure relief mechanism 211 of the cell 21 is arranged towards the exhaust device 3; the shell 31 is provided with an exhaust port 311 at the position corresponding to the pressure relief mechanism 211, and the pressure relief mechanism 211 is connected with the exhaust cavity 32 through the exhaust port 311, so that when the cell 21 occurs thermal runaway, the copper foil, aluminum foil and a large amount of heat inside the cell 21 are discharged into the exhaust cavity 32 through the exhaust port 311. The battery module 2 includes at least one layer of cell groups arranged along the third direction, which is arranged in the accommodating cavity 11 along the third direction with the exhaust device 3, so as to ensure that the cells 21 in each cell group can be connected with the exhaust device 3. It should be noted that the third direction, the second direction and the first direction are described in detail in Figure 1 It should be noted that the pressure relief mechanism 211 includes but is not limited to the explosion-proof valve.

[0049] In particular implementation, along the first direction, the battery module 2 includes two groups of cell groups arranged symmetrically, and the pressure relief mechanisms 211 of the cells 21 in the two groups of cell groups are arranged oppositely, and two exhaust cavities 32 respectively connected with the pressure relief mechanisms 211 of the two groups of cell groups are formed in the shell 31. It should be noted that at this time, the two exhaust cavities 32 can be combined into one chamber. The two side walls of the chamber along the first direction are arranged in the communication ports connected with the exhaust ports 311 of the exhaust device 3. When the exhaust cavity 32 is connected with only one group of cell groups, the exhaust cavity 32 is provided with a communication port connected with the exhaust port 311 only on one side surface close to the pressure relief mechanism 211 of the cell 21.

[0050] In specific implementation, the battery pack further comprises a first heat-conducting plate 7 arranged on both sides of the battery cell group along the third direction and a second heat-conducting plate 8 connected with the first heat-conducting plate 7 at an angle, so as to avoid the first heat-conducting plate 7 and the second heat-conducting plate 8 being parallel to each other and the second heat-conducting plate 8 failing to connect the first heat-conducting plate 7 on both sides of the battery cell group along the third direction, thereby avoiding the occurrence of the condition affecting the heat conduction. The second heat-conducting plate 8 is arranged on the side of the battery cell 21 away from the pressure relief mechanism 211. It should be noted that the two sides of the battery cell 21 along the third direction are large faces of the battery cell 21, and the heat-conducting plate is fixed by being connected in contact with the top cover 12 and the bottom plate 13 and the side plate of the box body 1, wherein the first heat-conducting plate 7 is connected in contact with the large face of the battery cell 21, and the second heat-conducting plate 8 is connected in contact with the bottom face of the battery cell 21, so as to transfer the heat generated by the large face and the bottom face of the battery cell 21 to the box body 1 through the heat-conducting plate, thereby achieving the cooling of the large face and the bottom face of the battery cell 21. It should be noted that the first heat-conducting plate 7 and the second heat-conducting plate 8 include but are not limited to aluminum plates, and the aluminum plates have excellent heat-conducting performance and can better transfer heat to the heat exchange medium. When the battery cell group is arranged in one layer along the third direction, the cross section of the first heat-conducting plate 7 and the second heat-conducting plate 8 along the second direction is in the shape of u; when the battery cell group is arranged in two layers along the third direction, the cross section of the first heat-conducting plate 7 and the second heat-conducting plate 8 along the second direction is in the shape of E; and when the battery cell group is arranged in multiple layers along the third direction, the cross section of the first heat-conducting plate 7 and the second heat-conducting plate 8 along the second direction is equivalent to multiple u-shaped plates stacked along the third direction in sequence, and the first heat-conducting plate 7 between adjacent two battery cell groups shares one u-shaped plate.

[0051] In specific implementation, the battery cell group and the first heat-conducting plate 7 are connected through a heat-conducting member; and / or, the battery cell group and the second heat-conducting plate 8 are connected through a heat-conducting member; and / or, the battery cell group and the box body 1 provided with the flow channel 4 are connected through a heat-conducting member. The heat-conducting member can further improve the heat-conducting performance of the battery cell 21, the first heat-conducting plate 7 and / or the second heat-conducting plate 8. It should be noted that the heat-conducting member includes heat-conducting glue, which has not only good heat-conducting performance but also excellent adhesive performance and can provide stable adhesion between different materials. High-quality heat-conducting glue can maintain its adhesive performance for a long time and is not prone to aging or falling off. Moreover, the heat-conducting glue has good corrosion resistance to various chemical substances and can maintain its performance in harsh chemical environments. However, the specific material type of the heat-conducting member can be designed according to actual needs by those skilled in the art.

[0052] In specific implementation, the flow channel 4 includes a plurality of branches 41 arranged along the third direction and connected to each other. The spacing between the plurality of branches 41 can improve the structural strength of the plate body where the flow channel 4 is located, and improve the structural stability of the plate body. At the same time, the plate body is provided with a plurality of branches 41, which can as much as possible improve the cross-sectional area of the flow channel 4, thereby improving the flow of the heat exchange medium in the plate body and better dissipating heat from the battery cell 21. At the same time, the plurality of branches 41 are connected, which facilitates the connection of the flow channel 4 to the outlet 6 and the inlet 5, and avoids the situation that each branch 41 is provided with an outlet 6 and an inlet 5, thereby causing the overall structure to be relatively complex.

[0053] In specific implementation, the exhaust device 3 further includes a power device 33, which is connected to the exhaust cavity 32 to discharge the exhaust to the outside of the box body 1 when the pressure relief mechanism 211 is opened. The power device 33 can improve the exhaust efficiency and make the gas in the exhaust cavity 32 discharged to the outside of the box body 1 as soon as possible. The shell 31 is closed at both sides along the third direction and at the end away from the power device 33, but is not limited thereto. The exhaust cavity 32 can be closed through the shell 31 along the third direction, or a separate outer wall can be provided to achieve the closure, i.e., the exhaust cavity 32 has an outer wall structure independent of the shell 31. When two exhaust cavities 32 are formed in the shell 31, the two exhaust cavities 32 are connected at the end toward the power device 33, but are not limited thereto. The two exhaust cavities 32 can also have respective power devices 33, but the two exhaust cavities 32 share one power device 33, so that the overall size of the battery is smaller. The specific arrangement of the exhaust cavity 32 and the power device 33 can be designed according to actual needs by those skilled in the art. When the battery cell 21 is in thermal runaway, the copper foil, aluminum foil and a large amount of heat inside the battery cell 21 will be discharged into the exhaust cavity 32 through the exhaust device 3. At this time, the power device 33 will start to work to discharge a large amount of heat generated by the runaway battery cell 21, thereby achieving the effect of rapid cooling and preventing the remaining battery cells 21 from being in thermal runaway due to the high temperature inside the battery pack.

[0054] In specific implementation, the power device 33 includes but is not limited to a centrifugal machine. The specific type and structure of the power device 33 can be designed according to actual needs by those skilled in the art.

[0055] In specific implementation, as shown in Figure 3 For example, when the battery cell 21 generates heat, the heat of the first heat-conducting plate 7 is transferred to the heat exchange medium in the flow channel 4 in the side plate along the arrow direction in Figure 3 The heat is carried out from the outlet 6 position through the circulation of the heat exchange medium in the flow channel 4.

[0056] In specific implementation, the accommodating cavity 11 in the box body 1 can be one or two, as shown in Figure 2The accommodating cavity 11 is provided with two, one of which is used for accommodating the battery cell 21, and the other is used for accommodating the BDU and other related structural members.

[0057] The utility model embodiment provides a kind of electric device, including above-mentioned battery pack.

[0058] The electric device of the utility model is not particularly limited, which can include but is not limited to: notebook computer, pen input type computer, mobile computer, electronic book player, portable telephone, portable fax machine, portable copier, portable printer, head-mounted stereo earphone, video recorder, liquid crystal television, portable cleaner, portable CD machine, mini disc, transceiver, electronic notepad, calculator, memory card, portable recorder, radio, backup power supply, motor, car, motorcycle, power-assisted bicycle, bicycle, lighting appliance, toy, game machine, clock, electric tool, flash light, camera, household large storage battery and lithium ion capacitor, etc.

[0059] Finally, it should also be noted that in this document, such as the first and second relationship terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0060] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between each embodiment can be referred to each other.

[0061] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that, include: The box (1) has a receiving cavity (11) inside, and a flow channel (4) is provided inside the box (1). A heat exchange medium is provided in the flow channel (4). The box (1) has an inlet (5) and an outlet (6) for the heat exchange medium to enter and exit. A battery module (2) is disposed in the receiving cavity (11). The battery module (2) includes at least one battery cell (21), and the battery cell (21) includes a pressure relief mechanism (211). An exhaust device (3) is disposed in the receiving cavity (11) along a third direction. The exhaust device (3) includes a housing (31) and an exhaust chamber (32) enclosed by the housing (31). The exhaust chamber (32) is connected to the pressure relief mechanism (211) of the battery cell (21). The exhaust chamber (32) is connected to the outside so that when the pressure relief mechanism (211) is opened, the exhaust material is discharged to the outside of the housing (1).

2. The battery pack according to claim 1, characterized in that, The housing (1) includes a top cover (12), a bottom plate (13) and a frame (14) surrounding the receiving cavity (11), and at least one of the top cover (12), the bottom plate (13) and the frame (14) is provided with the flow channel (4).

3. The battery pack according to claim 1, characterized in that, The battery module (2) includes at least one layer of battery cell group arranged along the third direction, each layer of battery cell group includes at least one battery cell (21) arranged along the second direction, and the pressure relief mechanism (211) of the battery cell (21) is arranged toward the exhaust device (3); The housing (31) has an exhaust port (311) at the position corresponding to the pressure relief mechanism (211), and the pressure relief mechanism (211) is connected to the exhaust chamber (32) through the exhaust port (311).

4. The battery pack according to claim 3, characterized in that, Along the first direction, the battery module (2) includes two sets of battery cells arranged symmetrically, and the pressure relief mechanism (211) of the battery cell (21) in the two sets of battery cells is arranged opposite to each other. The housing (31) has two exhaust chambers (32) that are respectively connected to the pressure relief mechanism (211) of the two sets of battery cells.

5. The battery pack according to claim 3, characterized in that, The battery pack also includes a first heat-conducting plate (7) disposed on both sides of the cell group along the third direction and a second heat-conducting plate (8) connected at an angle to the first heat-conducting plate (7), wherein the second heat-conducting plate (8) is disposed on the side of the cell (21) away from the pressure relief mechanism (211).

6. The battery pack according to claim 5, characterized in that, The battery cell assembly and the first heat-conducting plate (7) are connected by a heat-conducting component; And / or, the battery cell assembly and the second heat-conducting plate (8) are connected by a heat-conducting component; And / or, the battery cell assembly and the housing (1) provided with the flow channel (4) are connected by a heat-conducting component.

7. The battery pack according to claim 1, characterized in that, The flow channel (4) includes a plurality of branches (41) spaced apart along the third direction, and the plurality of branches (41) are connected to each other.

8. The battery pack according to claim 1, characterized in that, The exhaust device (3) also includes a power unit (33) connected to the exhaust chamber (32) to discharge the exhaust material to the outside of the housing (1) when the pressure relief mechanism (211) is opened; The housing (31) closes the exhaust chamber (32) on both sides along the third direction and at one end away from the power unit (33); When two exhaust chambers (32) are formed inside the housing (31), the two exhaust chambers (32) are connected at one end toward the power unit (33).

9. The battery pack according to claim 8, characterized in that, The power unit (33) includes a centrifuge.

10. An electrical device, characterized in that, Includes the battery pack according to any one of claims 1-9.

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