Battery pack and electric device

Abstract

The embodiment of the utility model discloses a battery pack and a power utilization device, a connecting device is arranged in the battery pack, a plate body in the connecting device is detachably mounted on the side wall of a box body, and during assembly, only the plate body needs to be fixedly mounted on the side wall of the box body, so that the production efficiency of the battery pack is improved, and the production cost is reduced. The detachable connection mode between the plate body and the side wall of the box body can provide convenience for later installation and maintenance, the reuse rate of parts is improved, the use and maintenance cost is reduced, in addition, the liquid inlet connector and the liquid outlet connector are integrated with the plate body, the integration degree is high, space is saved, the space utilization rate is improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] In recent years, with the continuous development of new energy, battery packs have been widely used as power sources for electrical devices. With the development of electrical devices (such as pure electric vehicles), the demand for space utilization of battery packs used has increased. However, existing battery packs have the problem of low space utilization. Utility Model Content

[0003] The embodiments of the present application provide a battery pack and an electrical device, which can solve the problem of low space utilization in existing battery packs.

[0004] The first aspect of the present application provides a battery pack, which includes a connecting device and a box body; a accommodating cavity is provided inside the box body, and the box body includes a side wall, and a mounting port connected to the accommodating cavity is opened on the side wall; the connecting device includes: a plate body, at least two sockets are opened on the plate body, and the plate body has a thickness direction, the plate body can be detachably mounted on the side wall and covers the mounting port, and the socket is connected to the accommodating cavity; a liquid inlet joint and a liquid outlet joint, the liquid inlet joint is inserted into one of the at least two sockets, and the liquid outlet joint is inserted into the other of the at least two sockets; wherein the liquid inlet joint and the liquid outlet joint are integrated with the plate body.

[0005] Optionally, the connecting device also includes a protective cover; the liquid inlet connector and the liquid outlet connector are both provided with the protective cover at one end away from the socket in the thickness direction; and / or the plate body includes two surfaces arranged opposite to each other along the thickness direction, at least one of the two surfaces is provided with ribs, and the liquid inlet connector and the liquid outlet connector are connected by the ribs.

[0006] Optionally, the connecting device also includes a liquid inlet pipe and a liquid outlet pipe; the liquid inlet joint penetrates the plate body along the thickness direction, and one end of the liquid inlet joint in the thickness direction extends into the accommodating cavity and is connected with the liquid inlet pipe; the liquid outlet joint penetrates the plate body along the thickness direction, and one end of the liquid outlet joint in the thickness direction extends into the accommodating cavity and is connected with the liquid outlet pipe.

[0007] Optionally, the connecting device also includes a liquid inlet end and a liquid outlet end; the end of the liquid inlet pipe in its length direction away from the liquid inlet joint is connected to the liquid inlet end; the end of the liquid outlet pipe in its length direction away from the liquid outlet joint is connected to the liquid outlet end.

[0008] Optionally, the connecting device also includes a flame retardant layer; the flame retardant layer is arranged on the side wall of the liquid inlet pipe along the circumferential direction of the liquid inlet pipe and extends along the length direction of the liquid inlet pipe; and / or the flame retardant layer is arranged on the side wall of the liquid outlet pipe along the circumferential direction of the liquid outlet pipe and extends along the length direction of the liquid outlet pipe.

[0009] Optionally, the connecting device also includes a fixing ring and a fixing piece; a mounting portion is provided on the plate body, and the plate body is detachably mounted on the side wall through the mounting portion, and a mounting hole is provided on the mounting portion, and the mounting hole penetrates the mounting portion along the thickness direction; a mounting groove is provided on the side wall of the fixing ring, and the mounting groove extends along the circumferential direction of the fixing ring, the fixing ring is connected to the mounting hole, the mounting groove is clamped with the mounting portion, and the fixing ring is coaxial with the mounting hole; the fixing piece is inserted into the mounting hole and passes through the fixing ring, and the fixing ring forms a lock for the fixing piece in the mounting hole.

[0010] Optionally, the connecting device also includes a sealing member, which is arranged on a side of the plate body facing the side wall in the thickness direction along the circumferential direction of the plate body, and the sealing member forms a seal between the plate body and the side wall; the sealing member includes a first end and a second end arranged opposite to each other along the thickness direction; along the thickness direction, a first groove is provided on a side of the first end facing away from the second end, and a second groove is provided on a side of the second end facing away from the first end; along the thickness direction, an end of the first groove facing away from the second end abuts against the plate body, and an end of the second groove facing away from the first end abuts against the side wall; the first groove and the second groove respectively surround the socket along the circumferential direction of the plate body.

[0011] Optionally, the seal has a wall surrounding the socket along the circumferential direction of the plate body, and the seal has a width direction intersecting with the plane where the wall is located, and the width direction intersects with the thickness direction; the number of the first grooves is at least two, and at least two of the first grooves are arranged at intervals along the width direction to form a wave shape; and / or, the number of the second grooves is at least two, and at least two of the second grooves are arranged at intervals along the width direction to form a wave shape.

[0012] Optionally, along the thickness direction, the first groove includes a first end surface and a second end surface that are oppositely disposed, and the distance between the first end surface and the second end surface is H 1 , meet: 1mm≤H 1 ≤15mm; and / or, along the thickness direction, the second groove includes a third end face and a fourth end face arranged opposite to each other, and the distance between the third end face and the fourth end face is H 2, meet: 1mm≤H 2 ≤15mm.

[0013] Optionally, the thermal conductivity of the plate is 0.1 W / m×k to 1.5 W / m×k.

[0014] A second aspect of the present application provides an electrical device, comprising the battery pack as described above.

[0015] The beneficial effect of the present application is to provide a battery pack and an electrical device having the battery pack, wherein a connecting device is provided in the battery pack, and a plate body in the connecting device is detachably mounted on the side wall of the box body. During assembly, the plate body only needs to be fixedly mounted on the side wall of the box body, thereby improving the production efficiency of the battery pack. The detachable connection between the plate body and the side wall of the box body can provide convenience for subsequent installation and maintenance, increase the reuse rate of components, and reduce the cost of use and maintenance. In addition, the liquid inlet connector and the liquid outlet connector are integrated with the plate body as an integrated arrangement, with high integration, space saving, improved space utilization, and reduced manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0018] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at point A;

[0019] Figure 3 yes Figure 2 Exploded diagram of

[0020] Figure 4 is a schematic structural diagram of a connecting device in a battery pack provided in an embodiment of the present application from a first angle;

[0021] Figure 5 yes Figure 4 Exploded diagram of

[0022] Figure 6 is a schematic structural diagram of a second angle of a connecting device in a battery pack provided in an embodiment of the present application;

[0023] Figure 7 is a schematic structural diagram of a connection device in a battery pack provided in an embodiment of the present application from a third angle;

[0024] Figure 8 yes Figure 7 BB section view;

[0025] Fig. 9 It is a structural schematic diagram of a first angle of a combination of a plate body, a liquid inlet connector, a liquid outlet connector, a fixing ring, and a sealing member in a connection device for a battery pack provided in an embodiment of the present application;

[0026] Fig.10 is a structural schematic diagram of a second angle of the combination of a plate body, a liquid inlet connector, a liquid outlet connector, a fixing ring and a sealing member in a connection device for a battery pack provided in an embodiment of the present application;

[0027] Fig.11 yes Fig.10 Schematic diagram of the structure after removing the seal;

[0028] Fig.12 is a schematic diagram of the structure of a sealing member in a battery pack provided in an embodiment of the present application;

[0029] Fig.13 yes Fig.12 CC section view;

[0030] Fig.14 yes Fig.13 A schematic diagram of the structure at D of FIG.

[0031] Fig.15 is a schematic diagram of the structure of a fixing ring in a battery pack provided in an embodiment of the present application;

[0032] Fig.16 yes Fig.15 EE section view.

[0033] Description of reference numerals:

[0034] 1. Battery pack;

[0035] 100, connecting device, 10, plate body, 101, surface, 1011, first surface, 1012, second surface, 102, rib, 11, socket, 12, mounting portion, 13, accommodating groove, 121, mounting hole, 21, liquid inlet joint, 211, first reinforcing rib, 22, liquid outlet joint, 221, second reinforcing rib, 30, protective cover, 41, liquid inlet pipe, 42, liquid outlet pipe, 43, flame retardant layer, 51, liquid inlet end, 52, liquid outlet end, 60, fixing ring, 61, mounting groove, 70, fixing member, 80, sealing member, 801, wall surface, 81, first end, 82, second end, 831, first groove, 8311, first end surface, 8312, second end surface, 832, second groove, 8321, third end surface, 8322, fourth end surface;

[0036] 200, box body, 201, accommodating cavity, 202, side wall, 203, installation opening;

[0037] X, thickness direction, Y, width direction. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and beneficial effects of this application clearer, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the application examples, "parallel" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles refer to a state where the tolerance range is -1% to 1%.

[0043] In an embodiment of the present application, an electric device is provided, including a battery pack 1, and the battery pack 1 serves as a power supply for the electric device. The electric device may be, but is not limited to, a mobile device (such as a mobile phone, a laptop computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship, a satellite, an energy storage system, etc.

[0044] In some embodiments of the present application, a battery pack 1 is provided, referring to Figures 1 to 16 The battery pack 1 includes: a connecting device 100 and a box body 200 .

[0045] Reference Figure 1 to Figure 3 , the box 200 includes a side wall 202, referring to Figure 3 The box body 200 has a receiving cavity 201 inside, and a mounting opening 203 is provided on a side wall 202 of the box body 200, and the mounting opening 203 is connected to the receiving cavity 201. The battery pack 1 further includes a battery pack (not shown in the figure) and a thermal management component (not shown in the figure), the battery pack is arranged in the receiving cavity 201, and the thermal management component includes a liquid cooling plate, a liquid supply pipe and a liquid return pipe, and the liquid cooling plate is used to adjust the working temperature of the battery pack.

[0046] Reference Figure 1 to Figure 14 The connecting device 100 includes: a plate body 10, a liquid inlet connector 21 and a liquid outlet connector 22.

[0047] Reference Figure 2 to Figure 11 The plate 10 has a thickness direction X, referring to Figure 6The plate body 10 is provided with a socket 11, which penetrates the plate body 10 along the thickness direction X. The plate body 10 is mounted on the side wall 202, and the socket 11 is connected to the accommodating cavity 201. The number of the sockets 11 is at least two. Figure 6 In the embodiment shown, there are two sockets 11, which are arranged at intervals. The plate body 10 includes two surfaces 101 arranged opposite to each other along the thickness direction X. Figure 4 , Figure 9-10 In the illustrated embodiment, the two surfaces 101 include a first surface 1011 and a second surface 1012. Figure 2 to Figure 5 , Figure 8 to Figure 11 The liquid inlet connector 21 and the liquid outlet connector 22 extend along the thickness direction X respectively. The liquid inlet connector 21 is inserted into one of the two sockets 11, and the liquid outlet connector 22 is inserted into the other of the two sockets 11. The liquid inlet connector 21, the liquid outlet connector 22 and the plate body 10 are integrated into one.

[0048] The liquid inlet connector 21 , the liquid outlet connector 22 and the plate body 10 may be integrated into one body by injection molding.

[0049] The liquid cooling system inside the battery pack is used to adjust the operating temperature of the battery pack so that the battery pack is at a suitable operating temperature. When in use, the liquid cooling system needs to be connected to the external liquid supply system through a liquid cooling joint arranged on the side wall of the box to achieve the circulation flow of the heat-conducting medium used by the liquid cooling system. In existing battery packs, the liquid cooling pipe joints are mostly welded to the side walls of the box through metal end plates (such as aluminum end plates), or the liquid cooling pipe joints are directly welded to the box. However, the welding production efficiency is extremely low and there is a risk of deformation of the box. Moreover, in existing battery packs, the liquid cooling pipe joints for liquid inlet and liquid outlet are usually arranged separately, which is not conducive to the space management of the battery pack.

[0050] The battery pack 1 provided in the embodiment of the present application forms a liquid cooling system of the battery pack 1 by setting a connecting device 100. The connecting device 100 and the thermal management component form a liquid cooling system of the battery pack 1. At least two sockets 11 are provided on the plate body 10 of the connecting device 100. The liquid inlet connector 21 is inserted into one of the sockets 11, and the liquid outlet connector 22 is inserted into the other socket 11. The liquid inlet connector 21 and the liquid outlet connector 22 are integrated with the plate body 10 as a whole, so that the total liquid inlet pipe and the total liquid outlet pipe connected to the thermal management component can be centrally connected to the plate body 10 of the connecting device 100. The integration is high, the space utilization rate inside the box body 200 is improved, the centralized management of the liquid cooling pipeline is convenient, and the manufacturing cost and subsequent maintenance cost are reduced. Moreover, in the connecting device 100 provided in the embodiment of the present application, the plate body 10 can be detachably installed on the side wall 202 of the box body 200, which provides convenience for later installation and maintenance, improves the reuse rate of the connecting device 100, and reduces the use and maintenance costs.

[0051] In some embodiments, reference Figure 2 to Figure 5 as well as Figure 8 The connecting device 100 further includes a protective cover 30, and the ends of the liquid inlet connector 21 and the liquid outlet connector 22 facing away from the socket 11 in the thickness direction X are both provided with a protective cover 30. Figure 2 to Figure 5 as well as Figure 8 to Figure 11 In the illustrated embodiment, the liquid inlet joint 21 penetrates the plate body 10 along the thickness direction X, and the liquid outlet joint 22 penetrates the plate body 10 along the thickness direction X. In other words, along the thickness direction X, the opposite ends of the liquid inlet joint 21 are respectively located on both sides of the plate body 10, one end of the opposite ends of the liquid inlet joint 21 in the thickness direction X extends into the accommodating cavity 201, and the protective cover 30 is provided on the other end of the liquid inlet joint 21. Along the thickness direction X, the opposite ends of the liquid outlet joint 22 are respectively located on both sides of the plate body 10, one end of the opposite ends of the liquid outlet joint 22 in the thickness direction X extends into the accommodating cavity 201, and the protective cover 30 is provided on the other end of the liquid outlet joint 22. The provision of the protective cover 30 can form a blockage for the liquid inlet joint 21 and the liquid outlet joint 22, and prevent foreign matter from entering the accommodating cavity 201 of the box body 200 through the liquid inlet joint 21 and / or the liquid outlet joint 22, resulting in the risk of short circuit or short connection.

[0052] In some embodiments, at least one of the two surfaces 101 of the plate body 10 is provided with ribs 102, the ribs 102 are protrudingly provided on the surface 101, and the liquid inlet connector 21 and the liquid outlet connector 22 are connected by the ribs 102. Figure 2 to Figure 7 as well as Figures 9 to 11 In the illustrated embodiment, ribs 102 are disposed on both the first surface 1011 and the second surface 1012 of the plate body 10. One end of the ribs 102 in the length direction is connected to the liquid inlet connector 21, and the other end is connected to the liquid outlet connector 22. The liquid inlet connector 21, the liquid outlet connector 22 and the plate body 10 are integrated and integrally formed. The provision of the ribs 102 can support and fix the liquid inlet connector 21 and the liquid outlet connector 22, prevent the liquid inlet connector 21 and the liquid outlet connector 22 from being deformed during the integral processing and forming with the plate body 10, and improve the manufacturing success rate and the yield rate.

[0053] In some embodiments, reference Figure 5 and Figure 8 The connecting device 100 also includes a liquid inlet pipe 41 and a liquid outlet pipe 42. Figure 2 to Figure 5 as well as Figure 8 to Figure 11The liquid inlet joint 21 and the liquid outlet joint 22 respectively penetrate the plate body 10 along the thickness direction X. Along the thickness direction X, the opposite ends of the liquid inlet joint 21 are respectively located on the two sides of the plate body 10, and the opposite ends of the liquid outlet joint 22 are respectively located on the two sides of the plate body 10. The plate body 10 is installed on the side wall 202. One end of the opposite ends of the liquid inlet joint 21 in the thickness direction X extends into the accommodating cavity 201 and is connected with the liquid inlet pipe 41. One end of the opposite ends of the liquid outlet joint 22 in the thickness direction X extends into the accommodating cavity 201 and is connected with the liquid outlet pipe 42. The liquid inlet pipe 41 is used to be connected to the liquid supply pipe in the thermal management component to supply the heat-conducting medium to the liquid cooling plate. The liquid outlet pipe 42 is used to be connected to the liquid return pipe in the thermal management component to recover the heat-conducting medium, thereby realizing the circulation of the heat-conducting medium in the liquid cooling plate to adjust the working temperature of the battery pack. The combination of the liquid inlet pipe 41 and the liquid inlet joint 21, and the combination of the liquid outlet pipe 42 and the liquid outlet joint 22, can form centralized management of the liquid inlet and liquid outlet in the thermal management component, with high integration, convenient for the centralized supply and centralized recovery of the heat transfer medium in the liquid cooling plate, and improve the circulation efficiency of the heat transfer medium, thereby improving the thermal management efficiency of the thermal management component for the battery pack, improving the space utilization of the accommodating cavity 201, and reducing the manufacturing cost of the battery pack 1.

[0054] In some embodiments, reference Figure 4-5 as well as Fig. 9 A first reinforcing rib 211 is provided on the liquid inlet joint 21, and a second reinforcing rib 221 is provided on the liquid outlet joint 22. Specifically, a first reinforcing rib 211 is provided on the outer wall of the liquid inlet joint 21 located on the side of the first surface 1011 away from the second surface 1012 in the thickness direction X, and the first reinforcing rib 211 extends along the thickness direction X. A second reinforcing rib 221 is provided on the outer wall of the liquid outlet joint 22 located on the side of the first surface 1011 away from the second surface 1012 in the thickness direction X, and the second reinforcing rib 221 extends along the thickness direction X. The first reinforcing rib 211 can improve the overall strength of the liquid inlet joint 21, and the second reinforcing rib 221 can improve the overall strength of the liquid outlet joint 22, prevent the liquid inlet joint 21 and the liquid outlet joint 22 from being deformed during integral processing with the plate body 10, improve the manufacturing success rate, and improve the yield rate.

[0055] In some embodiments, reference Figure 3 to Figure 8The connecting device 100 also includes a liquid inlet end 51 and a liquid outlet end 52. The end of the liquid inlet pipe 41 away from the liquid inlet joint 21 in the length direction is connected to the liquid inlet end 51, and the end of the liquid outlet pipe 42 away from the liquid outlet joint 22 in the length direction is connected to the liquid outlet end 52. The setting of the liquid inlet end 51 can improve the convenience and firmness of the connection between the liquid inlet pipe 41 and the liquid supply pipe in the thermal management component. The setting of the liquid outlet end 52 can improve the convenience and firmness of the connection between the liquid outlet pipe 42 and the liquid return pipe in the thermal management component, thereby preventing the battery pack 1 from loosening due to impact or shaking during use, thereby avoiding short circuit caused by leakage due to loose connection, and improving the service life and safety of the battery pack 1.

[0056] In some embodiments, reference Figure 3 to Figure 8 The connection device 100 further includes a flame retardant layer 43, which is disposed on the side wall of the liquid inlet tube 41 along the circumferential direction of the liquid inlet tube 41, and extends along the length direction of the liquid inlet tube 41. The flame retardant layer 43 may be made of a fireproof tape or a flame retardant coating to prevent the liquid inlet tube 41 from being damaged and causing leakage when the battery pack 1 has thermal runaway, thereby avoiding the risk of secondary short circuit caused by leakage and improving the safety of the battery pack 1.

[0057] In the following embodiments, reference Figure 3 to Figure 8 The flame retardant layer 43 is disposed on the side wall of the liquid outlet pipe 42 along the circumferential direction of the liquid outlet pipe 42, and the flame retardant layer 43 extends along the length direction of the liquid outlet pipe 42. The flame retardant layer 43 can be made of a fireproof tape or a flame retardant coating to prevent the liquid outlet pipe 42 from being damaged and causing leakage when the battery pack 1 has thermal runaway, thereby avoiding the risk of secondary short circuit caused by leakage and improving the safety of the battery pack 1.

[0058] In some embodiments, the thickness of the flame retardant layer 43 is 0.05 mm to 5 mm. When the thickness of the flame retardant layer 43 is within the above range, the use safety of the liquid inlet pipe 41 and / or the liquid outlet pipe 42 can be guaranteed, and the manufacturing cost can be reduced.

[0059] In some embodiments, reference Figure 2-3 The connecting device 100 also includes a fixing member 70, referring to Figure 2 to Figure 11 The plate body 10 is provided with a mounting portion 12, and the plate body 10 is detachably mounted on the side wall 202 of the box body 200 through the mounting portion 12. Specifically, the mounting portion 12 is protrudingly arranged on the first surface 101 of the plate body 10 along the thickness direction X, and the mounting portion 12 is provided with a mounting hole 121 that passes through the mounting portion 12 along the rear end direction X. Figure 2 and Figure 3The fixing member 70 is inserted into the mounting hole 121 to mount the plate body 10 on the side wall 202. The fixing member 70 is a bolt, and the fixing member 70 cooperates with the mounting portion 12 to fix the plate body 10 and the side wall 202, which can effectively improve the assembly efficiency between the connecting device 100 and the box body 200, and ensure the flatness of the side wall 202 of the box body 200, avoid deformation of the box body 200 during the assembly process of the connecting device 100 and the side wall 202, improve the yield rate, and reduce the production cost. The detachable connection between the plate body 10 and the side wall 202 provides convenience for later installation and maintenance, improves the reuse rate of components, and reduces the use and maintenance costs.

[0060] In some embodiments, reference Figure 5 , Figure 8-Figure 9 as well as Figure 15-16 The connection device 100 further includes a fixing ring 60, and a mounting groove 61 is provided on the outer peripheral wall of the fixing ring 60. The mounting groove 61 extends along the circumferential direction of the fixing ring 60 to form an annular groove structure. The fixing ring 60 is internally connected to the mounting hole 121 of the mounting portion 12. The mounting groove 61 is connected to the mounting portion 12 by snapping, and the fixing ring 60 is coaxial with the mounting hole 121. The fixing member 70 is inserted into the mounting hole 121 and passes through the fixing ring 60. The fixing ring 60 forms a locking for the fixing member 70 in the mounting hole 121. The setting of the fixing ring 60 can improve the assembly stability between the fixing member 70 and the mounting portion 12, thereby ensuring the installation stability and firmness between the plate body 10 and the side wall 202.

[0061] In some embodiments, reference Figure 5-6 , Figure 8 , Fig.10 as well as Figure 12 to Figure 14 The connecting device 100 further includes a sealing member 80, which is disposed on one side of the plate body 10 facing the side wall 202 in the thickness direction X. Specifically, the sealing member 80 is disposed on the second surface 1012 of the plate body 10. Figure 6 The seal 80 surrounds the two sockets 11 along the circumferential direction of the plate body 10, referring to Figure 13-14The sealing member 80 includes a first end 81 and a second end 82 which are arranged opposite to each other along the thickness direction X. Along the thickness direction X, a first groove 831 is provided on a side of the first end 81 away from the second end 82, and a second groove 832 is provided on a side of the second end 82 away from the first end 81. The first groove 831 and the second groove 832 surround the socket 11 along the circumferential direction of the plate body 10 respectively. The plate body 10 is mounted on the side wall 202 of the box body 200. The first end 81 of the sealing member 80 abuts against and is squeezed by the side wall 202, and the second end 82 abuts against and is squeezed by the plate body 10. The first end 81 is squeezed by the side wall 202. The wall 202 squeezes and discharges at least part of the air in the first groove 831 to form a negative pressure in the first groove 831, so that the seal 80 can fit tightly on the side wall 202, and the second end 82 is squeezed by the plate body 10 and discharges at least part of the air in the second groove 832 to form a negative pressure in the second groove 832, so that the seal 80 fits tightly with the plate body 10, further improving the sealing between the plate body 10 and the side wall 202 of the box body 200, effectively preventing external water vapor from entering the interior of the box body 200, improving the sealing performance of the box body 200, and thereby ensuring the safety of the battery pack 1.

[0062] In some embodiments, reference Figure 12 to Figure 14 The seal 80 has a wall surface 801 surrounding the socket 11 along the circumferential direction of the plate body 10. In other words, the shape of the seal 80 is annular, and the wall surface 801 is the outer annular surface of the seal 80. The first groove 831 and the second groove 832 respectively surround the socket 11 along the circumferential direction of the plate body 10 to form an annular groove structure. The seal 80 has a width direction Y intersecting with the plane where the wall surface 801 is located, and the width direction Y intersects with the thickness direction X of the plate body 10. Specifically, Fig.13 and Fig.14 In the illustrated embodiment, the width direction Y is orthogonal to the thickness direction X.

[0063] In some embodiments, the number of the first grooves 831 is at least two, and they are arranged in a wave shape at intervals along the width direction Y. The plate body 10 is mounted on the side wall 202, and the first end 81 is squeezed by the side wall 202, and the internal air of the multiple first grooves 831 is discharged, and negative pressure is formed in each first groove 831, forming multiple seals, thereby forming multiple barriers to the invasion of water vapor outside the box body 200, and further improving the reliability of the seal between the plate body 10 and the side wall 202 by the seal 80.

[0064] In some embodiments, the number of the first grooves 831 is 2 to 20. Specifically, the number of the first grooves 831 can be one of 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 or a range consisting of any two of them. It is worth noting that the above specific values ​​are only given as examples, and any integer value within the range of 2 to 20 is within the protection scope of this application. When the number of the first grooves 831 is 2 to 20, the sealing performance of the seal 80 between the plate body 10 and the side wall 202 can be guaranteed, and the problems of high manufacturing cost and reduced fitting tightness due to too many first grooves 831 can be avoided.

[0065] In some embodiments, the number of the second grooves 832 is at least two, and they are arranged in a wave shape at intervals along the width direction Y. The plate body 10 is installed on the side wall 202, and the second end 82 is squeezed by the side wall plate body 10, and the internal air of the multiple second grooves 832 is discharged, and negative pressure is formed in each second groove 832, forming multiple seals, thereby forming multiple barriers to the invasion of water vapor outside the box body 200, and further improving the reliability of the seal between the plate body 10 and the side wall 202 by the seal 80.

[0066] In some embodiments, the number of the second grooves 832 is 2 to 20. Specifically, the number of the second grooves 832 can be 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 or a range consisting of any two of them. It is worth noting that the above specific values ​​are only given as examples, and any integer value within the range of 2 to 20 is within the protection scope of this application. When the number of the second grooves 832 is 2 to 20, the sealing performance of the seal 80 between the plate body 10 and the side wall 202 can be guaranteed, and the problem of high manufacturing cost and reduced fit tightness due to too many second grooves 832 can be avoided.

[0067] In some embodiments, reference Fig.14 The first groove 831 includes a first end surface 8311 and a second end surface 8312 which are arranged opposite to each other along the thickness direction X. The distance between the first end surface 8311 and the second end surface 8312 along the thickness direction X is H. 1 mm, satisfying: 1mm≤H 1 ≤15mm, specifically, H 1 The value of H can be one of 1mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm or any two of them. It is worth noting that the above specific values ​​are only given as examples. 1 Any value within the range of ≤15 mm is within the protection scope of this application. 1When the value is within the above range, it can ensure that the first groove 831 has sufficient depth. When the first end 81 is squeezed by the side wall 202, enough air is discharged from the inside of the first groove 831 to form sufficient negative pressure, so as to ensure the tightness of the fit between the seal 80 and the side wall 202, thereby ensuring the reliability of the seal between the plate body 10 and the side wall 202 by the seal 80.

[0068] In some embodiments, reference Fig.14 The second groove 832 includes a third end face 8321 and a fourth end face 8322 which are arranged opposite to each other along the thickness direction X. Along the thickness direction X, the distance between the third end face 8321 and the fourth end face 8322 is H. 2 mm, satisfying: 1mm≤H 2 ≤15mm, specifically, H 2 The value of H can be one of 1mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm or any two of them. It is worth noting that the above specific values ​​are only given as examples. 2 Any value within the range of ≤15 mm is within the protection scope of this application. 1 When the value is within the above range, it can ensure that the second groove 832 has sufficient depth. When the second end 82 is squeezed by the plate body 10, enough air is discharged from the second groove 832 to form sufficient negative pressure, so as to ensure the tightness of the fit between the seal 80 and the side wall 202, thereby ensuring the reliability of the seal between the plate body 10 and the side wall 202 by the seal 80.

[0069] In some embodiments, reference Fig.11 The plate body 10 is provided with a receiving groove 13 on one side facing the side wall 202 in the thickness direction X, and the receiving groove 13 surrounds the socket 11 along the circumferential direction of the plate body 10, and the seal 80 is embedded in the receiving groove 13. Specifically, the receiving groove 13 is provided on the second surface 1012 of the plate body 10, and the second end 82 of the seal 80 is inserted in the receiving groove 13. The seal 80 is embedded in the receiving groove 13, which improves the assembly stability between the plate body 10 and the seal 80, and when the plate body 10 squeezes the second end 82, the receiving groove 13 can form a barrier to external water vapor, thereby improving the stability of the negative pressure inside the second groove 832, thereby ensuring the reliability of the seal between the plate body 10 and the side wall 202 by the seal 80.

[0070] In some embodiments, the thermal conductivity of the plate body 10 is 0.1W / m×k to 1.5W / m×k. Specifically, the thermal conductivity of the plate body 10 can be 0.1W / m×k, 0.3W / m×k, 0.5W / m×k, 0.7W / m×k, 0.9W / m×k, 1.1W / m×k, 1.3W / m×k, 1.5W / m×k, or any two of them. It is worth noting that the above specific values ​​are only given for example, and any value of the thermal conductivity of the plate body 10 within the range of 0.1W / m×k to 1.5W / m×k is within the protection scope of the present application.

[0071] In existing battery packs, the liquid cooling pipe joints connecting the thermal management components inside the battery pack and the external equipment are mostly installed on the side wall of the box through metal end plates (such as aluminum end plates, pure steel end plates, etc.). The thermal conductivity of aluminum is as high as 205W / m×k~237W / m×k, and the thermal conductivity of pure steel is 50W / m×k~60W / m×k. The higher thermal conductivity will transfer part of the heat to the box during heat transfer, resulting in heat loss, and then resulting in a decrease in thermal management efficiency. The plate body 10 provided in the embodiment of the present application has a thermal conductivity of 0.1W / m×k~1.5W / m×k, which is significantly lower than that of the metal end plate. When the thermal conductivity of the plate body 10 is between 0.1W / m×k and 1.5W / m×k, it can effectively reduce the heat conducted to the side wall 202, thereby reducing the heat conducted to the box 200, shortening the low-temperature heating and high-temperature cooling time, and improving the thermal management efficiency.

[0072] In some embodiments, the material of the board body 10 is plastic material, and the board body 10 is a plastic board.

[0073] The assembly method of the battery pack 1 provided in the embodiment of the present application is as follows:

[0074] One end of the liquid inlet pipe 41 is connected to the liquid inlet joint 21, and the other end is extended from the installation port 203 of the box body 200 into the accommodating cavity 201 and connected to the liquid supply pipe in the thermal management component. One end of the liquid outlet pipe 42 is connected to the liquid outlet joint 22, and the other end is extended from the installation port 203 into the accommodating cavity 201 and connected to the liquid return pipe in the thermal management component to complete the assembly between the connecting device 100 and the thermal management component. The plate body 10 is abutted against the side wall 202, and the plate body 10 is covered on the installation port 203. The fixing member 70 (such as a bolt) is inserted into the mounting hole 121 of the mounting portion 12, and the plate body 10 is assembled with the side wall 202. In the process of assembling, the plate body 10 and the side wall 202 are squeezed so that the sealing member 80 is tightly fitted to the side wall 202. The protective cover 30 is covered on the liquid inlet joint 21 and the liquid outlet joint 22 to complete the assembly between the connecting device 100 and the box body 200.

[0075] The above is a detailed introduction to a battery pack and an electrical device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: The battery pack comprises a connecting device (100) and a box body (200); The box body (200) is provided with a receiving cavity (201) inside, and the box body (200) comprises a side wall (202), and the side wall (202) is provided with a mounting opening (203) communicating with the receiving cavity (201); The connecting device (100) comprises: A plate body (10), the plate body (10) being provided with at least two sockets (11), the plate body (10) having a thickness direction (X), the plate body (10) being detachably mounted on the side wall (202) and covering the mounting opening (203), the sockets (11) being in communication with the accommodating cavity (201); a liquid inlet joint (21) and a liquid outlet joint (22), wherein the liquid inlet joint (21) is inserted into one of the at least two sockets (11), and the liquid outlet joint (22) is inserted into the other of the at least two sockets (11); Wherein, the liquid inlet joint (21) and the liquid outlet joint (22) are integrated with the plate body (10).

2. The battery pack according to claim 1, characterized in that: The connecting device (100) further comprises a protective cover (30); The protective cover (30) is provided on one end of the liquid inlet joint (21) and the liquid outlet joint (22) that is away from the socket (11) in the thickness direction (X); And / or, the plate body (10) comprises two surfaces (101) arranged opposite to each other along the thickness direction (X), at least one of the two surfaces (101) is provided with a rib (102), and the liquid inlet joint (21) and the liquid outlet joint (22) are connected via the rib (102).

3. The battery pack according to claim 1, wherein: The connecting device (100) further comprises a liquid inlet pipe (41) and a liquid outlet pipe (42); The liquid inlet joint (21) penetrates the plate body (10) along the thickness direction (X), and one end of the liquid inlet joint (21) in the thickness direction (X) extends into the accommodating cavity (201) and communicates with the liquid inlet pipe (41); The liquid outlet joint (22) penetrates the plate body (10) along the thickness direction (X), and one end of the liquid outlet joint (22) in the thickness direction (X) extends into the accommodating cavity (201) and is connected to the liquid outlet pipe (42).

4. The battery pack according to claim 3, characterized in that: The connecting device (100) further comprises a liquid inlet end (51) and a liquid outlet end (52); The end of the liquid inlet pipe (41) away from the liquid inlet joint (21) in the length direction thereof is in communication with the liquid inlet end (51); One end of the liquid outlet pipe (42) away from the liquid outlet joint (22) in the length direction thereof is in communication with the liquid outlet end (52).

5. The battery pack according to claim 3, characterized in that: The connecting device (100) further comprises a flame retardant layer (43); The flame retardant layer (43) is arranged on the side wall of the liquid inlet pipe (41) along the circumferential direction of the liquid inlet pipe (41), and extends along the length direction of the liquid inlet pipe (41); And / or, the flame retardant layer (43) is arranged on the side wall of the liquid outlet pipe (42) along the circumferential direction of the liquid outlet pipe (42) and extends along the length direction of the liquid outlet pipe (42).

6. The battery pack according to claim 1, wherein: The connecting device (100) further comprises a fixing ring (60) and a fixing member (70); The plate body (10) is provided with a mounting portion (12), and the plate body (10) is detachably mounted on the side wall (202) through the mounting portion (12); a mounting hole (121) is provided on the mounting portion (12), and the mounting hole (121) penetrates the mounting portion (12) along the thickness direction (X); A mounting groove (61) is provided on the side wall of the fixing ring (60), the mounting groove (61) extends along the circumferential direction of the fixing ring (60), the fixing ring (60) is inscribed in the mounting hole (121), the mounting groove (61) is clamped with the mounting portion (12), and the fixing ring (60) is coaxial with the mounting hole (121); The fixing member (70) is inserted into the mounting hole (121) and passes through the fixing ring (60), and the fixing ring (60) locks the fixing member (70) in the mounting hole (121).

7. The battery pack according to claim 1, characterized in that: The connecting device (100) further comprises a sealing member (80), wherein the sealing member (80) is arranged along the circumferential direction of the plate body (10) on a surface of the plate body (10) facing the side wall (202) in the thickness direction (X), and the sealing member (80) forms a seal between the plate body (10) and the side wall (202); The sealing member (80) comprises a first end (81) and a second end (82) which are arranged opposite to each other along the thickness direction (X); Along the thickness direction (X), a first groove (831) is provided on a side of the first end (81) facing away from the second end (82), and a second groove (832) is provided on a side of the second end (82) facing away from the first end (81); Along the thickness direction (X), one end of the first groove (831) away from the second end (82) abuts against the plate body (10), and one end of the second groove (832) away from the first end (81) abuts against the side wall (202); The first groove (831) and the second groove (832) respectively surround the socket (11) along the circumferential direction of the plate body (10).

8. The battery pack according to claim 7, characterized in that: The sealing member (80) has a wall surface (801) surrounding the socket (11) along the circumferential direction of the plate body (10), and the sealing member (80) has a width direction (Y) intersecting with the plane where the wall surface (801) is located, and the width direction (Y) intersects with the thickness direction (X); The number of the first grooves (831) is at least two, and at least two of the first grooves (831) are arranged at intervals along the width direction (Y) to form a wave shape; And / or, the number of the second grooves (832) is at least two, and at least two of the second grooves (832) are arranged at intervals along the width direction (Y) to form a wave shape.

9. The battery pack according to claim 8, characterized in that: Along the thickness direction (X), the first groove (831) includes a first end surface (8311) and a second end surface (8312) arranged opposite to each other, and the distance between the first end surface (8311) and the second end surface (8312) is H1, satisfying: 1mm≤H1≤15mm; And / or, along the thickness direction (X), the second groove (832) includes a third end face (8321) and a fourth end face (8322) that are arranged opposite to each other, and the distance between the third end face (8321) and the fourth end face (8322) is H2, satisfying: 1mm≤H2≤15mm.

10. The battery pack according to claim 1, wherein: The thermal conductivity of the plate body (10) is 0.1 W / m×k to 1.5 W / m×k.

11. An electrical device, characterized in that: The invention comprises a battery pack as claimed in any one of claims 1 to 10.

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