Battery pack, manufacturing method of battery pack and electric equipment

Abstract

The invention provides a battery pack, a manufacturing method of the battery pack and electric equipment, and belongs to the technical field of batteries, the battery pack comprises a battery pack and a tray, the battery pack is provided with a first end, and the first end is provided with a welding area. The tray comprises a bottom plate and a frame, the bottom plate and the frame are connected and define a containing cavity, the battery pack is located in the containing cavity, the frame comprises an end beam and an edge beam which are connected, the end beam is opposite to the first end, and in the height direction of the tray, the top face of the end beam is lower than at least part of the welding area. Therefore, the battery pack can be arranged in the accommodating cavity of the tray in advance, the welding area of the first end of the battery pack is located on one side of the end beam, at the moment, the connecting piece, the functional plate and other parts are welded through laser beams, the tray does not need to be turned over, and therefore the assembling efficiency of the battery pack is effectively improved. And the forward assembled battery pack can be adaptively assembled according to the edge position of the tray, so that the consistency of assembly gaps is ensured.

Description

Technical Field

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

[0002] The battery pack includes a tray and a battery module located in the tray. Currently, in the process of assembling the battery pack, the battery cells are usually stacked first, and the battery cells are connected by welding connectors to form a module. The tray is then hoisted and turned upside down to assemble with the module, and then flipped over to install other components. The assembly process is cumbersome and complicated, which reduces the assembly efficiency of the battery pack. Summary of the invention

[0003] The embodiments of the present application provide a battery pack, a method for manufacturing the battery pack, and an electrical device, which can effectively simplify the assembly process of the battery pack, thereby effectively improving the assembly efficiency of the battery pack.

[0004] The embodiments of the present application provide the following technical solutions to solve the above technical problems:

[0005] In the first part, an embodiment of the present application provides a battery pack, including:

[0006] A battery pack having a first end, wherein a welding area is disposed on the first end;

[0007] A tray, the tray comprising a receiving cavity, the battery pack being located in the receiving cavity, the tray comprising an end beam, the end beam being arranged close to the first end and the top surface of the end beam being lower than at least a portion of the welding area in the height direction of the tray.

[0008] In the embodiment of the present application, the height of the end beam of the tray is shortened so that the top surface of the end beam opposite to the first end of the battery pack is lower than at least part of the welding area. When the battery pack is welded in the accommodating cavity, the height of the end beam can meet the welding requirements of the welding area at the first end of the battery pack. During the battery pack assembly process, the battery pack can be pre-loaded into the accommodating cavity of the tray so that the welding area at the first end of the battery pack is located on one side of the end beam, and laser beam welding is used at this time. In this way, the battery module is loaded into the accommodating cavity of the tray in the forward direction, and there is no need to flip the tray, thus eliminating the flipping process. The assembly process is relatively small and the operation is simple, which can effectively simplify the assembly process of the battery pack, thereby effectively improving the assembly efficiency of the battery pack. In addition, the forward-assembled battery pack can be adaptively assembled according to the edge position of the tray to ensure the consistency of the assembly gap.

[0009] In a possible implementation manner, the battery pack includes a plurality of batteries and connectors, and the plurality of connectors are welded to poles of the plurality of batteries so that the plurality of batteries are connected in series.

[0010] In a possible implementation manner, the welding area includes a first welding zone, the first welding zone is located on the connecting member arranged at the first end, and the top surface of the end beam is lower than the first welding zone.

[0011] In a possible implementation, it further includes a sampling assembly, the sampling assembly including a function board and a plurality of first sampling sheets, the function board is located at the first end, and some of the first sampling sheets are located at the top of the function board;

[0012] The first sampling piece located at the top of the functional board is connected to the connecting piece

[0013] In a possible embodiment, the welding area also includes a second welding area, part of the first sampling piece is located at the bottom end of the functional board and is welded to the outer shells of multiple batteries respectively, the second welding area is located on the part of the first sampling piece, and the top surface of the end beam is higher or lower than the second welding area.

[0014] In a possible embodiment, along the height direction of the pallet, the distance between the top surface of the end beam and the inner bottom wall of the pallet is a, the distance between the connection point of the portion of the first sampling piece close to the inner bottom wall of the pallet and the inner bottom wall of the pallet is d, and the distance between the connection point of the portion of the first sampling piece close to the inner bottom wall of the pallet and the top surface of the end beam is c, and a≤d+c.

[0015] In a possible implementation manner, the distance between the connection point on the portion of the first sampling sheet and a surface of the end beam facing the accommodating cavity is b, and b≥10c.

[0016] In a possible implementation manner, some of the first sampling sheets have a bending portion, and a plurality of the bending portions are respectively connected to shells of a plurality of the batteries by welding.

[0017] In a possible implementation, along the extension direction of the battery, the height of the first sampling piece is e, the distance between the connection point on the bent portion close to the inner bottom wall of the tray and the top of the bent portion is f, and e<10f.

[0018] In a possible implementation, the pallet further includes a side beam, the side beam is connected to the end beam at an angle, and in the height direction of the pallet, the top surface of the side beam is higher than the top surface of the end beam.

[0019] In a possible implementation manner, an inclined transition surface is provided on the side beam, and the top surface of the side beam is connected to the top surface of the end beam through the transition surface.

[0020] In a possible implementation manner, an angle formed between the transition surface and the top surface of the edge beam is α, and 120°≤α≤180°.

[0021] In a possible implementation manner, a support plate is provided on a side of the transition surface facing the accommodating cavity.

[0022] In a possible implementation manner, the support plate is provided with reinforcing ribs, and the reinforcing ribs extend in a height direction of the tray.

[0023] In a possible implementation, the battery pack has a second end opposite to the first end, and the sampling assembly further includes a circuit board and a plurality of second sampling sheets, and the circuit board is connected to the second end of the battery pack through the second sampling sheets.

[0024] In a possible implementation manner, a plurality of the second sampling pieces are respectively located at the top end and the bottom end of the circuit board, and the second sampling piece located at the top end of the circuit board is connected to the connecting piece at the second end;

[0025] The second sampling sheet located at the bottom end of the circuit board is connected to the shell of the battery.

[0026] In a possible implementation manner, the battery pack further includes a plurality of brackets, the plurality of brackets are respectively located at two ends of the battery, and the brackets are used to fix the battery;

[0027] And / or, the battery pack further comprises a plurality of protective covers, which are respectively arranged at the first end and the second end, the protective cover at the first end is used to protect the functional board, and the protective cover at the second end is used to protect the circuit board.

[0028] In a possible implementation, the number of the end beams is two, and the two end beams are respectively a front beam and a rear beam that are arranged opposite to each other, and the front beam and the rear beam are respectively connected to two opposite side beams to form a frame to enclose the accommodating cavity;

[0029] There are multiple battery groups, two of which are spaced apart in a direction from the front beam to the rear beam, and the front beam is opposite to a first end of one of the two battery groups, and the rear beam is opposite to a first end of another of the two battery groups.

[0030] In a possible embodiment, it also includes a cover plate, which has a connecting surface on one side of the cover plate facing the frame, and the connecting surface includes a front sealing surface, a rear sealing surface and two side sealing surfaces, the front sealing surface is connected to the top surface of the front beam, the rear sealing surface is connected to the top surface of the rear beam, and the side sealing surfaces are connected to the top surface of the side beam.

[0031] In a possible implementation manner, an annular groove is provided on the top surface of the frame surrounding the accommodating cavity, and the annular groove is used to accommodate sealant so that the top surface of the frame and the connecting surface of the cover plate form a seal.

[0032] In a possible implementation, a heat exchange channel is provided in the cover plate, and a heat exchange medium is circulated in the heat exchange channel, and the heat exchange medium is used to exchange heat for the battery pack.

[0033] In a possible implementation manner, an insulating film is provided on a surface of the cover plate facing the accommodating cavity, and the insulating film is used for high temperature resistance;

[0034] And / or, an anti-corrosion layer is provided on a surface of the cover plate facing away from the accommodating cavity.

[0035] In the second part, the embodiment of the present application provides a method for manufacturing a battery pack, including:

[0036] Providing a tray, the tray comprising a receiving cavity;

[0037] A battery pack is provided, wherein the battery pack has a first end and a second end that are oppositely arranged, the first end having a welding area, and the battery pack is placed in the accommodating cavity of the tray in a forward-placed manner, the first end is opposite to an end beam of the tray, and the top surface of the end beam is lower than at least a portion of the welding area;

[0038] A function board is installed on the welding area of ​​the first end, and the welding area of ​​the first end is connected to the function board through a first sampling sheet.

[0039] In a possible implementation manner, each of the battery packs includes two edge modules, the two edge modules are arranged opposite to each other, and each of the edge modules includes a plurality of batteries;

[0040] Before placing the battery pack in the receiving cavity of the tray in a forward-facing manner, the method includes:

[0041] A circuit board is installed at the second end of each edge module, and the two edge modules with the circuit board installed are placed forwardly in the accommodation cavity of the tray close to the side beams of the battery pack.

[0042] In a possible implementation manner, each of the battery packs further includes a middle module, the middle module includes an even number of batteries, and the middle module is located between the two edge modules;

[0043] Before placing the battery pack in the receiving cavity of the tray in a forward-facing manner, the method further includes:

[0044] The circuit board is mounted on the second end of the middle module, and the middle module with the circuit board mounted thereon is placed between the two edge modules in a forward-facing manner.

[0045] In a possible implementation manner, before installing the functional board on the welding area of ​​the first end, the method includes:

[0046] Connecting the pole on the first end of the edge module and the pole on the first end of the middle module in series through a plurality of connectors;

[0047] The first sampling piece at the top end of the functional board is connected to the first welding area on the connecting piece at the first end, and the first sampling piece at the bottom end of the functional board is connected to the second welding area on the first end.

[0048] In a possible implementation manner, after the function board is installed at the first end of the battery pack, the method further includes:

[0049] A cover plate is provided, and the cover plate is covered on the tray, and the cover plate is connected to the frame of the tray by fasteners.

[0050] In the third part, the embodiment of the present application provides an electric device, including:

[0051] An electric device, and a battery pack manufactured by the above-mentioned battery pack or the method for manufacturing a battery pack, wherein the battery pack is connected to the electric device and is used to provide electric energy to the electric device.

[0052] In addition to the technical problems solved by the present application, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by a battery pack, a method for manufacturing a battery pack, and electrical equipment provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments of the present application or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0055] Figure 2 A schematic diagram of the structure of a tray of a battery pack provided in an embodiment of the present application;

[0056] Figure 3 A partial detailed view of the front view of the tray of the battery pack provided in the embodiment of the present application;

[0057] Figure 4 A partial detailed view of the front beam of the battery pack provided in an embodiment of the present application;

[0058] Figure 5 An exploded view of a first end of a battery pack of a battery pack provided in an embodiment of the present application;

[0059] Figure 6 An exploded view of the second end of the battery pack of the battery pack provided in an embodiment of the present application;

[0060] Figure 7 A front view of the assembly of a battery pack in a battery pack provided in an embodiment of the present application;

[0061] Figure 8 An assembly dimension diagram of a battery pack in a battery pack provided in an embodiment of the present application;

[0062] Fig. 9 A schematic diagram of a process for manufacturing a battery pack provided in an embodiment of the present application;

[0063] Fig.10 A schematic diagram of the process of installing a circuit board of a battery pack provided in an embodiment of the present application;

[0064] Fig.11 A schematic diagram of the process of installing the functional board of the battery pack provided in an embodiment of the present application.

[0065] Description of reference numerals:

[0066] 100-battery pack; 110-battery; 120-welding area; 121-first welding area; 122-second welding area; 130-functional board; 140-first sampling piece; 141-bending portion; 150-circuit board; 160-second sampling piece; 170-connector; 180-bracket; 190-protective cover;

[0067] 200-tray; 210-accommodation cavity; 220-bottom plate; 230-frame; 231-annular groove; 232-mounting hole; 240-end beam; 241-front beam; 242-rear beam; 250-side beam; 251-transition surface; 252-support plate; 253-reinforcement rib; 260-cross beam;

[0068] 300-cover plate; 310-front sealing surface; 320-rear sealing surface; 330-side sealing surface;

[0069] 410-edge module; 420-middle module. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0071] The embodiment of the present application provides an electric device, which includes an electric device and a battery pack, and the battery pack provides electric energy to the electric device. For example, the electric device can be a vehicle or an energy storage device. When the electric device is a vehicle, the vehicle can be a new energy vehicle (New Energy Vehicle), such as a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle; referred to as: PEV / BEV), a range extended electric vehicle (Range Extended Electric Vehicle; referred to as: REEV), a hybrid electric vehicle (Hybrid Electric Vehicle; referred to as: HEV), a fuel cell electric vehicle), and the vehicle can also be any vehicle with a battery.

[0072] The electrical device may also be a motor, a control system, a lighting system, etc. When the electrical device is an energy storage device, the electrical device may be an inverter, a controller, etc. The battery pack may include multiple batteries. In a possible implementation, the battery may be a cylindrical battery, or the battery may be a square shell battery, or the battery may have several batteries inside. And multiple batteries realize the storage and output of electric energy through a certain connection method and control system. The battery pack or battery can provide electric energy to the electrical device to meet the normal operation of the device.

[0073] The present application embodiment provides a battery pack, such as Figure 1 As shown, the battery pack includes a battery pack 100 and a tray 200. The battery pack 100 has a first end, and a welding area 120 is provided on the first end. The tray 200 includes a bottom plate 220 and a frame 230, the bottom plate 220 is connected to the frame 230, and forms a receiving cavity 210, the battery pack 100 is located in the receiving cavity 210, the frame 230 includes an end beam 240 and a side beam 250 connected, the end beam 240 is opposite to the first end, and in the height direction of the tray 200, the top surface of the end beam 240 is lower than at least part of the welding area 120.

[0074] The accommodating cavity 210 can be used to accommodate devices forming a battery pack, and the battery pack 100 and other devices forming the battery pack can be arranged in the accommodating cavity 210. The tray 200 includes a bottom plate 220 and a frame 230, which together enclose the accommodating cavity 210. The tray 200 can safely fix and support the battery pack 100, ensure the stability of the battery pack 100, reduce or avoid external impact forces acting on the battery pack 100, and can effectively reduce the damage of the battery 110 of the battery pack 100 due to external impact forces, which helps to improve the service life of the battery pack 100 and is also conducive to the overall transportation and installation of the battery pack 100.

[0075] Among them, the number of battery packs 100 can be multiple, and multiple battery packs 100 can be electrically connected to form a larger battery pack 100 assembly to provide power for electrical devices. In the embodiment of the present application, the number of battery packs 100 is two, but it is not limited to two. For example, it can be one or three or more, which will not be described here. It should be noted that each battery pack 100 has a first end, and the first end is arranged opposite to the end beam 240 of the tray 200. In this way, after the battery pack 100 is placed in the accommodating cavity 210 of the tray 200, a laser can be used outside the tray 200 to weld the relevant components of the first end of the battery pack 100.

[0076] The frame 230 includes an end beam 240 and a side beam 250, and the end beam 240 and the side beam 250 are closely connected to form the frame 230. The top surface of the end beam 240 is lower than the top surface of the side beam 250, that is, the height of the end beam 240 is less than the height of the side beam 250, so that the welding area 120 of the first end of the battery pack 100 is at least partially higher than the top surface of the end beam 240. In other words, the first end of the battery pack 100 will not be completely blocked by the end beam 240 of the frame 230, and part of the first end of the battery pack 100 can leak out from the top surface of the end beam 240 of the frame 230. When the battery pack 100 is forwardly mounted in the accommodating cavity 210 of the tray 200, the first end of the battery pack 100 can be welded and connected to the device to complete the assembly of the battery pack.

[0077] For example, when there is one battery pack 100, the first end of the battery pack 100 is disposed opposite to the end beam 240 of the frame 230. Alternatively, when there are multiple battery packs 100, the first end of each battery pack 100 is disposed opposite to the end beam 240 of the frame 230.

[0078] In this embodiment, the bottom plate 220 can be a cooling plate or a composite plate or a metal plate. The cooling plate helps the thermal management of the battery pack 100 during operation, the composite plate can provide better strength and weight support, and the metal plate has excellent electrical and thermal conductivity. It should be noted that the bottom plate 220 can be made of the above-mentioned types of materials, but is not limited to the above-mentioned types, which will not be described here. The material of the bottom plate 220 can be selected according to the actual battery pack requirements.

[0079] In the embodiment of the present application, each battery pack 100 includes a plurality of batteries 110, and the batteries 110 can be used to store and release electrical energy. The plurality of batteries 110 of the battery pack 100 can be connected in series through a connector 170 to provide the required voltage and current for the electrical device. A plurality of batteries 110 form a battery pack 100, and the number of batteries 110 can be determined and adjusted based on the size of the tray 200 and the electrical energy specifications required by the electrical device, which will not be elaborated here. The poles of two adjacent batteries 110 are connected by a connector 170, and the connector 170 can be connected to the poles of the battery 110 by welding to achieve series connection between the batteries.

[0080] In the example of the present application, the welding area 120 at the first end of the battery pack 100 includes a first welding area 121, the first welding area 121 is located on the connecting member 170 provided at the first end of the battery pack, and the top surface of the end beam 240 is lower than the first welding area 121. It can be understood that when the first welding area 121 is higher than the top surface of the end beam 240, the battery 110 is properly installed in the accommodating cavity 210, and the top surface of the end beam 240 will not affect the welding operation of the first welding area 121.

[0081] In the example of the present application, the welding area 120 at the first end of the battery pack 100 also includes a second welding area 122, and the top surface of the end beam 240 is higher or lower than the second welding area 122. It is understandable that when the top surface of the end beam 240 is lower than the second welding area 122, the second welding area 122 is exposed outside the top surface of the end beam 240. At this time, the second welding area 122 will not be blocked by the top surface of the end beam 240, which will affect the welding operation of the second welding area 122. When the top surface of the end beam 240 is higher than the second welding area 122, the second welding area 122 will be blocked by part of the top surface of the end beam 240. In order to meet the requirements of the welding operation, the height of the end beam 240 is limited, which will be explained in detail below.

[0082] In some embodiments of the present application, Figure 4 and Figure 5 As shown, the battery pack 100 includes a sampling component, which includes a functional board 130 and a first sampling piece 140. The functional board 130 is arranged at the first end of the battery pack 100. The functional board 130 is connected to the battery pack 100 through the first sampling piece 140. The sampling pieces 140 are respectively located at the top and bottom ends of the functional board 130.

[0083] The function board 130 may be a battery information controller (BIC), and the function board 130 may be used to monitor the voltage, current, temperature and other related information of the battery pack 100 in real time to ensure the safe and efficient operation of the battery pack 100. The first sampling sheets 140 are located at the top and bottom of the function board 130, and the number of the first sampling sheets 140 matches the number of the batteries 110 in the battery pack 100. The first sampling sheets 140 may be used as voltage sampling lines of the batteries 110 and may also play a role in heat dissipation. The first sampling sheets 140 may be nickel sheets but are not limited to nickel sheets, and may also be metal sheets made of other metal materials.

[0084] It should be noted that the first sampling piece 140 at the top of the function board 130 is electrically connected to the first welding area 121 on the connector 170 at the first end of the battery pack 100. The first sampling piece 140 at the bottom of the function board 130 is connected to the second welding area 122 on the first end shell of the battery 110 to ensure that the function board 130 is electrically connected to the battery 110 shell of the battery pack 100.

[0085] In some embodiments of the present application, Figure 5 As shown, the first sampling piece 140 located at the bottom of the function board 130 has a bending portion 141 , and the first sampling piece 140 is welded to the second welding area 122 via the bending portion 141 . The connection point on the first sampling piece 140 is located on the bending portion 141 .

[0086] The first sampling piece 140 at the bottom end of the functional board 130 has a bending portion 141, and the first sampling piece 140 is connected to the second welding area 122 at the first end of the battery pack 100 through the bending portion 141. Through the bending portion 141, the first sampling piece 140 can be more firmly welded to the second welding area 122 at the first end of the battery pack 100. The bending portion 141 can increase the welding area and provide additional mechanical support to make the connection more firm and reliable.

[0087] It can be understood that the bending portion 141 on the first sampling piece 140 can better adapt to the spatial layout inside the battery pack. The first sampling piece 140 with the bending portion 141 can meet the connection requirements of the shape and angle of the second welding area 122 on the outer shell of the battery 110, ensuring a smooth and compact connection.

[0088] In a possible implementation, the first sampling piece 140 is connected to the welding area 120 at the first end by laser beam welding, and a welding point is formed on the bending portion 141 of the first sampling piece 140. The welding point is a connection point, and the connection point can be rectangular or circular or other shapes. The size and shape of the welding point are not described here. The welding point only needs to ensure the stability of the first sampling piece 140 and the welding area 120.

[0089] In some embodiments of the present application, Figure 7 and Figure 8 As shown, along the height direction of the battery pack, the height of the end beam 240 is a, the shortest distance between the connection point on the first sampling piece 140 and the bottom plate 220 is d, the shortest distance between the connection point on the bending portion 141 close to the bottom plate 220 and the top surface of the end beam 240 is c, and a≤d+c.

[0090] It should be noted that the height a of the end beam 240 is large enough to provide better support and protection for the battery pack 100. When the height a of the end beam 240 is too large, it will affect the forward assembly of the battery pack 100 in the accommodating cavity 210, and the first end of the battery pack 100 cannot be laser welded, and it will also cause waste of space inside the battery pack and increase the weight of the battery pack.

[0091] It is understandable that the shortest distance d between the connection point on the first sampling piece 140 and the bottom plate 220 depends on the internal design size of the battery pack 100 and the space utilization in the battery pack. The shortest distance c between the connection point on the bending portion 141 of the first sampling piece 140 close to the bottom plate 220 and the top surface of the end beam 240 depends on the relative position between the first sampling piece 140 and the end beam 240. The shortest distance c between the connection point on the bending portion 141 close to the bottom plate 220 and the top surface of the end beam 240 needs to meet the welding requirements of the laser beam to avoid interference during the welding process.

[0092] In some embodiments of this application, please continue to refer to Figure 7 and Figure 8 , the shortest distance between the bent portion 141 and the side of the end beam 240 facing the accommodating cavity 210 is b, and b≥10c. It can be understood that in order to ensure that during the welding process, the galvanometer of the laser welding equipment can smoothly guide the laser beam to the first sampling piece 140 and the welding area 120 of the first end of the battery pack 100, by setting a larger b value, the welding offset caused by equipment accuracy, material differences, processing errors, etc. can be avoided, and the reliability and stability of the welding of the first sampling piece 140 can be improved.

[0093] In some embodiments of this application, please continue to refer to Figure 7 and Figure 8 , along the direction perpendicular to the end beam 240, the height of the first sampling piece 140 is e, the shortest distance between the connection point on the bending portion 141 close to the bottom plate 220 and the top of the bending portion 141 is f, and e<10f. It can be understood that limiting the height of the first sampling piece 140 can ensure that the first sampling piece 140 provides sufficient connection strength, and does not occupy too much space in the accommodating cavity 210 due to the over-size of the first sampling piece 140, and is also conducive to maintaining the flexibility and reliability of the bending portion 141.

[0094] In some embodiments of the present application, Figure 3 As shown, an inclined transition surface 251 is provided on the side beam 250, and the side beam 250 is connected to the end beam 240 through the transition surface 251, and the angle formed by the transition surface 251 and the top surface of the side beam 250 is α, and 120°≤α≤180°. For example, the angle formed between the transition surface 251 and the top surface of the side beam 250 can be 120°, 135°, 165°, 180°, etc., and can be adjusted according to the height of the battery pack 100 and the number of batteries 110.

[0095] The inclined transition surface 251 makes the connection between the side beam 250 and the end beam 240 smoother, which helps to reduce stress concentration. When subjected to external force, the inclined transition surface 251 on the side beam 250 can disperse and transfer stress, thereby enhancing the strength of the connection part, improving the stability of the overall structure, helping to extend the service life of the tray 200, and improving the safety and reliability of the battery pack. In addition, the smooth and continuous sealing surface on the side beam 250 is also helpful to reduce or eliminate the possibility of battery pack leakage caused by uneven connection parts.

[0096] In some embodiments of the present application, Figure 2 and Figure 3As shown, a support plate 252 is provided on the side of the transition surface 251 facing the accommodating cavity 210, and a reinforcing rib 253 is provided on the support plate 252, and the reinforcing rib 253 is perpendicular to the bottom plate 220. In this way, the support plate 252 and the reinforcing rib 253 can be used to support the battery 110 near the side beam 250 in the battery pack 100.

[0097] In the battery pack 100, the battery 110 close to the edge beam 250 is the edge module 410. Due to the position, the edge module 410 may be subjected to uneven pressure or temperature distribution, resulting in excessive expansion of the battery 110 of the edge module 410. The support plate 252 and the reinforcing rib 253 can effectively limit the expansion range of the edge module 410, preventing the battery 110 of the edge module 410 from affecting the performance and life of the entire battery pack 100 due to expansion.

[0098] The reinforcing ribs 253 are arranged on the support plate 252, and the reinforcing ribs 253 are perpendicular to the inner bottom wall of the bottom plate 220, so that the structural strength of the support plate 252 can be enhanced, so that the support plate 252 can better withstand the pressure and vibration from the edge module 410 battery 110. The reinforcing ribs 253 can also disperse stress and reduce the possibility of deformation and damage of the support plate 252, thereby improving the overall stability and reliability of the battery pack 100. In the embodiment of the present application, four reinforcing ribs 253 are arranged on each support plate 252, and the top of each reinforcing rib 253 is flush with the top of the support plate 252. It should be noted that the number and length of the reinforcing ribs 253 can be, but are not limited to, the above-mentioned settings, and can be set according to the actual needs of the battery pack.

[0099] In some embodiments of the present application, Figure 1 and Figure 2 As shown, there are two end beams 240, and the two end beams 240 are respectively a front beam 241 and a rear beam 242 that are arranged opposite to each other, and two opposite side beams 250 are arranged between the front beam 241 and the rear beam 242. There are multiple battery packs 100, and two of the multiple battery packs 100 are arranged at intervals along the direction from the front beam 241 to the rear beam 242, and the front beam 241 is opposite to the first end of one of the two battery packs 100, and the rear beam 242 is opposite to the first end of the other of the two battery packs 100.

[0100] In the embodiment of the present application, the two end beams 240 include a front beam 241 and a rear beam 242 that are arranged opposite to each other, and two side beams 250 that are arranged opposite to each other are provided between the front beam 241 and the rear beam 242. The front beam 241, the side beam 250 and the two side beams 250 are connected to form a frame 230, so as to achieve the stability of the overall structure and provide reliable support and protection for the battery pack 100.

[0101] In a possible implementation, there are two battery packs 100, wherein the first end of one battery pack 100 is disposed opposite to the front beam 241, and the first end of the other battery pack 100 is disposed opposite to the rear beam 242. In another possible implementation, there may be multiple battery packs 100, wherein two of the multiple battery packs 100 are disposed at intervals along the Y-axis direction, and the first end of one of the two battery packs 100 is disposed opposite to the front beam 241, and the first end of the other of the two battery packs 100 is disposed opposite to the rear beam 242. In this way, the battery packs 100 can be first loaded into the accommodating cavity 210 of the tray 200 to perform device connection at the first end of each battery pack 100.

[0102] In some embodiments of the present application, Figure 2 As shown, a crossbeam 260 is provided in the accommodating cavity 210, and the crossbeam 260 is arranged opposite to the front beam 241 and the rear beam 242, and the two ends of the crossbeam 260 are connected to the side beam 250. The crossbeam 260 divides the accommodating cavity 210 into a plurality of sub-cavities, and one or more battery packs 100 are arranged in each sub-cavity. In this way, the crossbeam 260 can provide a stable lateral support structure, effectively dispersing the weight and vibration of the battery pack during use, thereby protecting the battery pack 100 from damage.

[0103] The crossbeam 260 serves as a partition element to divide the accommodating cavity 210 into a plurality of sub-cavities, each of which is relatively independent, which is conducive to the management and maintenance of each sub-cavity. One or more battery packs 100 can be arranged in each sub-cavity, and the battery packs 100 in each sub-cavity can be independently monitored, controlled and maintained, thereby improving the response speed and accuracy of the entire system. In addition, when a battery pack 100 in a sub-cavity fails or an abnormality occurs, the spread of the failure or abnormality can be limited to prevent it from causing a greater impact on the entire battery pack.

[0104] In some embodiments of the present application, Figure 1 and Figure 2 As shown, the battery pack 100 has a second end opposite to the first end, the second end is opposite to the cross beam 260 , and the second end of the battery pack 100 also has a welding area 120 .

[0105] In some embodiments of the present application, Figure 6As shown, the sampling assembly further includes a circuit board 150 and a second sampling sheet 160, and the circuit board 150 is connected to the second end of the battery pack 100 through the second sampling sheet 160. The circuit board 150 may be a flexible printed circuit 150 (FPC), and the circuit board 150 is connected to the second end of the battery pack 100 through the second sampling sheet 160. The circuit board 150 may be responsible for signal transmission, power management, temperature monitoring, safety protection, etc. within the battery pack 100, and the overall performance and safety of the battery pack 100 may be improved by setting the circuit board 150.

[0106] Two second sampling pieces 160 are provided on each circuit board 150, and the two second sampling pieces 160 are respectively located at the top and bottom of the circuit board 150. The second sampling piece 160 located at the top of the circuit board 150 is electrically connected to the connector 170 at the second end of the battery pack 100, and the second sampling piece 160 located at the bottom of the circuit board 150 is connected to the outer shell of the second end of the battery 110.

[0107] In some embodiments of the present application, Figures 3 to 6 As shown, each battery pack 100 includes a bracket 180 and a protective cover 190, the bracket 180 is located at both ends of the battery 110, and the bracket 180 is used to fix the battery 110. The protective cover 190 is respectively arranged at the first end and the second end of the battery pack 100, the protective cover 190 located at the first end is used to protect the functional board 130, and the protective cover 190 located at the second end is used to protect the circuit board 150.

[0108] The bracket 180 can provide stable support for the battery 110 to prevent the battery pack from being subjected to vibration and impact from the external environment during use, which may cause the battery 110 to shift or be damaged. By setting the bracket 180, the stability of the internal structure of the battery pack 100 can be maintained, ensuring good contact and electrical connection between the batteries 110.

[0109] The function board 130 has various electronic components, such as controllers, sensors, etc. By providing a protective cover 190 at the first end of the battery pack 100, it is possible to reduce the damage to the function board 130 caused by external impact, water splash, dust, etc., ensure the normal use of the function board 130, and contribute to the normal operation of the battery pack 100. The protective cover 190 is provided on the side of the function board 130 facing the end beam 240, and there is a certain buffer gap between the protective cover 190 and the function board 130, which can reduce the direct impact of external impact on the function board 130, and can also provide a certain thermal expansion space when the internal temperature of the battery pack 100 changes, to prevent mechanical stress damage caused by thermal expansion and contraction.

[0110] The electronic circuits on the circuit board 150 are very delicate and vulnerable to damage. By installing a protective cover 190 at the second end of the battery pack 100, the possibility of physical damage to the circuit board 150 at the second end of the battery pack 100 during transportation, installation and use can be significantly reduced. In addition, the protective cover 190 can also provide a certain electromagnetic shielding effect to reduce the impact of external electromagnetic interference on the circuit board 150. The protective cover 190 is arranged on the side of the circuit board 150 facing the front beam 241, and there is a certain buffer gap between the protective cover 190 and the circuit board 150, which is conducive to reducing the damage to the circuit board 150 caused by external impact, and can also provide a certain buffer space in the vibration and temperature changes generated when the circuit board 150 is working, protecting the circuit board 150 from mechanical stress.

[0111] In some embodiments of the present application, Figure 1 As shown, the battery pack further includes a cover plate 300, and the cover plate 300 is connected to the frame 230 via fasteners. The frame 230 is formed by integral die casting, or the frame 230 is formed by splicing and welding.

[0112] The cover plate 300 can seal the receiving cavity 210 of the tray 200 to protect the battery 110, the functional board 130, the circuit board 150 and other components of the battery pack 100 in the receiving cavity 210 from the external environment. The cover plate 300 and the frame 230 can be connected by fasteners to effectively prevent the cover plate 300 from loosening or falling off under vibration, impact, etc. The fasteners can be screws, bolts, buckles, etc., and the specific selection can be based on the actual design requirements of the battery pack and the use environment.

[0113] In a possible implementation, the frame 230 can be manufactured by an integrated die-casting process, and the frame 230 is an integral structure, and there are no seams or welding points between the front beam 241, the rear beam 242 and the side beam 250. The frame 230 has high structural strength, good sealing performance, and can withstand large mechanical stress, and is not easy to deform or crack, thereby ensuring the overall stability and safety of the battery pack.

[0114] In another possible implementation, the frame 230 can also be formed by splicing and welding, and the frame 230 is spliced ​​by the front beam 241, the rear beam 242 and the two side beams 250, and connected together by welding or other methods. The splicing and welding forming method has more advantages in the manufacturing flexibility of the tray 200, and the shape and size of the tray 200 can be adjusted accordingly according to the actual needs of the specific battery pack.

[0115] In some embodiments of the present application, a connection surface that matches the frame 230 of the tray 200 is provided on the side of the cover plate 300 facing the tray 200, and the cover plate 300 is connected to the frame 230 through the connection surface. The connection surface includes a front sealing surface 310, a rear sealing surface 320, and two side sealing surfaces 330, the front sealing surface 310 is connected to the top surface of the front beam 241, the rear sealing surface 320 is connected to the top surface of the rear beam 242, and the side sealing surface 330 is connected to the top surface of the side beam 250.

[0116] It is understandable that, in order to ensure the connection stability and sealing effect between the cover plate 300 and the frame 230, a front sealing surface 310 matched with the top surface of the front beam 241, a rear sealing surface 320 matched with the top surface of the rear beam 242, and a side sealing surface 330 matched with the top surface of the side beam 250 are provided on the side of the cover plate 300 facing the accommodating cavity 210. Adaptively, a transition bevel sealing surface can also be provided on the cover plate 300 opposite to the transition surface 251 of the side beam 250, and the sealing performance of the cover plate 300 and the tray 200 is ensured by the tight fit between the transition bevel sealing surface and the transition surface 251.

[0117] In some embodiments of the present application, Figure 2 As shown, a ring groove 231 is provided on the side of the frame 230 facing away from the accommodating cavity 210, and the groove is used to accommodate the sealant, and a seal is formed between the connecting surface of the sealant cover plate 300 and the top surface of the frame 230. The frame 230 is provided with a mounting hole 232, and the mounting hole 232 is used to accommodate the hanging ear.

[0118] It is understandable that pouring sealant into the annular groove 231 can improve the sealing effect between the connection surface of the cover plate 300 and the top surface of the frame 230, and effectively prevent the penetration of liquid, gas or solid particles in the external environment. The sealant can be made of a material with good adhesion, elasticity and aging resistance, which is not limited here. After filling the sealant in the annular groove 231, the frame 230 is connected to the top cover using fasteners to ensure the reliability and sealing of the connection.

[0119] The mounting holes 232 provided on the frame 230 are used to accommodate the lifting ears, so as to connect the battery pack to the lifting equipment (such as a crane, a hook, etc.) during the lifting, transportation or installation process, improve work efficiency, and ensure the safety and stability of the lifting process. It should be noted that the position, number and size of the mounting holes 232 should be reasonably designed according to actual needs to ensure the stable installation of the lifting ears and the safety of the lifting process.

[0120] In some embodiments of the present application, a heat exchange channel is provided in the cover plate 300, and a heat exchange medium is provided in the heat exchange channel, and the heat exchange medium is used to exchange heat for the battery pack 100. It is understandable that the battery pack 100 will generate heat during operation, and in extreme cases, abnormal conditions such as short circuit or overheating may occur inside the battery pack. The heat is quickly absorbed by the heat exchange medium in the heat exchange channel to reduce the temperature of the battery pack 100, thereby preventing the occurrence of thermal runaway to a certain extent and improving the safety of the battery pack. It should be noted that the heat exchange medium can be water, ethylene glycol solution or other low-boiling point liquids, which are not limited here and can be adjusted according to actual working conditions.

[0121] In some embodiments of the present application, an insulating film is provided on the side of the cover plate 300 facing the accommodating cavity 210, and the insulating film is used to resist high temperatures. An anti-corrosion layer is provided on the side of the cover plate 300 facing away from the accommodating cavity 210. It is understandable that the battery pack 100 inside the battery pack will generate heat during the charging and discharging process. The side of the cover plate 300 facing the accommodating cavity 210 is provided with a high-temperature resistant insulating film to ensure that the insulation performance remains stable in a high-temperature environment, thereby enhancing the safety and reliability of the battery pack 100.

[0122] The battery pack is usually installed inside the vehicle. During daily use, the battery pack is exposed to the external environment, such as moisture, corrosive gases, ultraviolet radiation, etc., which may cause the battery pack cover 300 to be corroded. The anti-corrosion layer is provided on the side of the cover 300 facing away from the accommodating cavity 210, which can effectively resist the damage of harmful substances in the external environment to the cover 300 and maintain the integrity and aesthetics of the cover 300.

[0123] See also Fig. 9 As shown, the embodiment of the present application also includes a method for manufacturing a battery pack, which can manufacture the above-mentioned battery pack. The method for manufacturing the battery pack includes:

[0124] S10. Provide a pallet 200. The pallet 200 includes a bottom plate 220 and a frame 230. The bottom plate 220 is connected to the frame 230 and forms a receiving cavity 210. The frame 230 includes an end beam 240 and a side beam 250 connected to each other. The height of the end beam 240 is less than the height of the side beam 250.

[0125] S20. Provide a battery pack 100, wherein the battery pack 100 has a first end and a second end that are relatively arranged, and the first end has a welding area 120. The battery pack 100 is placed in a forward orientation in the accommodating cavity 210 of the tray 200, and the first end is opposite to the end beam 240, and the top surface of the end beam 240 is lower than at least a portion of the welding area 120.

[0126] S30 , installing the function board 130 on the welding area 120 at the first end, placing the battery pack 100 in the accommodating cavity 210 , and connecting the welding area 120 at the first end and the function board 130 via the first sampling sheet 140 .

[0127] S40, providing a cover plate 300, covering the cover plate 300 on the tray 200, and connecting the cover plate 300 to the frame 230 of the tray 200 through fasteners.

[0128] The tray 200 provided in the embodiment of the present application is used to fix and support the battery pack 100. The tray 200 is composed of a bottom plate 220 and a frame 230. The frame 230 includes an end beam 240 and a side beam 250. The end beam 240 and the side beam 250 together form a receiving cavity 210 for receiving the battery pack 100. The tray 200 can improve the stability of the battery pack 100, reduce the damage to the battery pack 100 caused by external impact, and extend the service life of the battery pack 100.

[0129] The battery pack 100 provided in the embodiment of the present application includes a plurality of batteries 110, and brackets 180 are respectively provided at both ends of each battery 110, and the plurality of batteries 110 are fixed by the brackets 180. Connectors 170 are also provided at both ends of the plurality of batteries 110, and the plurality of batteries 110 are connected in series by the connectors 170. A circuit board 150 is installed at the second end of the plurality of batteries 110 to realize signal transmission, power management, temperature monitoring, safety protection, etc. inside the battery pack 100, and a protective cover 190 is installed on one side of the circuit board 150 to protect the circuit board 150. Fig.10 As shown, the battery pack 100 mounting circuit board 150 includes:

[0130] S21, connecting the pole on the second end of the battery 110 to the connector 170 by laser welding.

[0131] S22, connecting the second sampling piece 160 at the top end of the circuit board 150 to the connecting piece 170 on the second end, and connecting the second sampling piece 160 at the bottom end of the circuit board 150 to the housing of the second end of the battery.

[0132] S23 , providing a protection cover 190 , and installing the protection cover 190 on the second end of the battery pack 100 to protect the circuit board 150 .

[0133] S24 , placing the battery pack 100 with the circuit board 150 mounted thereon in the receiving cavity 210 of the tray 200 in a forward direction, so that the second end of the battery pack 100 is close to the cross beam 260 , and the first end of the battery pack 100 is close to the end beam 240 .

[0134] It is understandable that the first end of the battery pack 100 is close to the end beam 240, which is conducive to installing the function board 130, and the voltage, current, temperature and other related information of the battery pack 100 are monitored in real time through the function board 130 to ensure the safe and efficient operation of the battery pack 100. Fig.11 As shown, the battery pack 100 is equipped with a functional board 130 including:

[0135] S31, connecting the pole on the first end of the battery 110 to the connector 170 by laser welding.

[0136] S32, connecting the first sampling piece 140 at the top of the function board 130 to the first welding area 121 on the connector 170 at the first end of the battery pack 100, and connecting the first sampling piece 140 at the bottom of the function board 130 to the second welding area 122 on the first end.

[0137] S33 , providing a protection cover 190 , and installing the protection cover 190 on the first end of the battery pack 100 to protect the function board 130 .

[0138] In the present application example, the bracket 180 may be a plastic bracket 180. A circuit board 150 is installed at one end of the plurality of batteries 110 to connect the plurality of batteries 110 in series. Two adjacent batteries 110 are electrically connected via a connector 170 to transfer electrical energy from one battery 110 to another battery 110 to achieve a series connection between the batteries 110. It should be noted that the number of batteries 110 in each battery pack 100 is not limited, and the number and size of the batteries 110 may be adjusted accordingly based on the actual power requirements and design of the battery pack.

[0139] In an embodiment of the present application, each battery pack 100 includes two edge modules 410, which are arranged opposite to each other and are respectively close to the side beams 250 of the battery pack. The high voltage of the battery 110 on the side close to the side beam 250 in the edge module 410 is led out and is electrically connected to the adjacent edge module 410.

[0140] It should be noted that the number of batteries 110 in each edge module 410 can be any number. When the edge module 410 has an odd number of batteries 110, the two edge modules 410 of two adjacent battery packs 100 close to the same side beam 250 can be directly electrically connected from the second end close to the beam, so that the two adjacent battery packs 100 are connected in series, reducing the connection path between the two adjacent battery packs 100 and improving the energy transmission efficiency of the battery packs 100. Figure 2As shown, the number of batteries 110 in the edge module 410 in the example of the present application is three. Of course, the batteries 110 in the edge module 410 can be, but are not limited to, an odd number of batteries 110, and can also be an even number of batteries 110, which is not limited here, and the number of batteries 110 in the edge module 410 can be adjusted according to the installation requirements of the battery pack.

[0141] Each battery pack 100 also includes a middle module 420, which includes an even number of batteries 110, and the middle module 420 is located between two edge modules 410. The batteries 110 at both ends of the middle module 420 are electrically connected to the adjacent edge modules 410 respectively. In this way, the batteries 110 at both ends of the middle module 420 are electrically connected to the batteries 110 of the adjacent edge modules 410, ensuring the integrity of the electrical connection of the entire battery pack 100 and the continuity of the current path, reducing the loss of the current of the battery pack 100 during the transmission process, and improving the energy transmission efficiency of the battery pack 100. Figure 2 As shown, the number of batteries 110 in the intermediate module 420 of the present application example is two. It should be noted that the number of batteries 110 in the intermediate module 420 is an even number because a circuit board 150 at the second end of the battery 110 can only connect two batteries 110.

[0142] In a possible implementation, the battery pack 100 may also include only two edge modules 410, and the sum of the number of batteries 110 of the two edge modules 410 is equal to the number of batteries 110 of the battery pack 100. In this case, the middle module 420 may not be provided to meet the requirements of a battery pack with limited space or other battery pack usage scenarios, that is, the two edge modules 410 have an even number of batteries 110.

[0143] For example, a battery pack has two battery packs 100, and each battery pack 100 includes two edge modules 410 and a middle module 420. The two edge modules 410 are respectively a first edge module and a second edge module. The first edge module and the second edge module are arranged opposite to each other, and the first edge module and the second edge module are respectively close to the two side beams 250 of the tray 200, and the middle module 420 is located between the first edge module and the second edge module.

[0144] The two batteries 110 in the middle module 420 close to the two edge modules 410 and the second ends of the batteries 110 are electrically connected to the two edge modules 410 respectively, and the connector 170 and the circuit board 150 are welded on the poles at the second ends of the batteries 110, so that the two ends of the middle module 420 are electrically connected to the first edge module and the second edge module respectively. After the battery pack 100 with the circuit board 150 installed is placed forwardly in the accommodating cavity 210, the batteries 110 in the middle module 420 close to the two edge modules 410 and the first ends of the batteries 110 are electrically connected to the two edge modules 410 respectively, and the connector 170 and the functional board 130 are welded on the poles at the first ends of the batteries 110, and the middle module 420 is connected in series with the first edge module and the second edge module, so that the forward assembly of the battery pack 100 is realized.

[0145] It is understandable that the series connection between the two battery packs 100 can electrically connect the edge module 410 of one battery pack 100 with the edge module 410 of the other battery pack 100. When the edge modules 410 on the same side of the two battery packs 100 are directly connected after the high voltage is drawn from the side beam 250, and the high voltage is drawn from the second end of each battery pack 100, the current transmission path between the two battery packs 100 can be reduced, and the energy transmission efficiency can be improved. However, it is not limited to the above-mentioned high voltage drawing method, and can be adjusted according to the number of batteries 110 in the battery pack 100, which will not be repeated here.

[0146] Among them, the terms "upper" and "lower" are used to describe the relative position relationship of each structure in the accompanying drawings, which is only for the convenience of description and is not used to limit the scope of implementation of the present application. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of the present application without substantially changing the technical content.

[0147] It should be noted that: in this application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0148] In addition, in this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected 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.

[0149] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A battery pack (100), the battery pack (100) having a first end, the first end being provided with a welding area (120); A tray (200), the tray (200) comprising a receiving cavity (210), the battery pack (100) being located in the receiving cavity (210), the tray (200) comprising an end beam (240), the end beam (240) being arranged close to the first end, and in the height direction of the tray (200), the top surface of the end beam (240) is lower than at least a portion of the welding area (120).

2. The battery pack according to claim 1, characterized in that: The battery pack (100) comprises a plurality of batteries (110) and a connector (170), wherein the plurality of connectors (170) are welded to the poles of the plurality of batteries (110) so that the plurality of batteries (110) are connected in series.

3. The battery pack according to claim 2, characterized in that: The welding area (120) comprises a first welding zone (121), the first welding zone (121) is located on the connecting member (170) arranged at the first end, and the top surface of the end beam (240) is lower than the first welding zone (121).

4. The battery pack according to claim 2, characterized in that: Also included is a sampling assembly, the sampling assembly comprising a function board (130) and a plurality of first sampling sheets (140), the function board (130) being located at the first end, and some of the first sampling sheets (140) being located at the top of the function board (130); The first sampling piece (140) located at the top of the functional board (130) is connected to the connecting piece (170).

5. The battery pack according to claim 4, characterized in that: The welding area (120) further includes a second welding area (122), a portion of the first sampling piece (140) is located at the bottom end of the functional board (130) and is respectively welded to the shells of a plurality of batteries (110), the second welding area (122) is located on the portion of the first sampling piece (140), and the top surface of the end beam (240) is higher or lower than the second welding area (122).

6. The battery pack according to claim 5, characterized in that: Along the height direction of the tray (200), the distance between the top surface of the end beam (240) and the inner bottom wall of the tray (200) is a, the distance between the connection point of the portion of the first sampling piece (140) close to the inner bottom wall of the tray (200) and the inner bottom wall of the tray (200) is d, and the distance between the connection point of the portion of the first sampling piece (140) close to the inner bottom wall of the tray (200) and the top surface of the end beam (240) is c, and a≤d+c.

7. The battery pack according to claim 6, characterized in that: The distance between the connection point on the portion of the first sampling piece (140) and the side of the end beam (240) facing the accommodating cavity (210) is b, and b≥10c.

8. The battery pack according to claim 6, characterized in that: The part of the first sampling sheets (140) all have a bending portion (141), and a plurality of the bending portions (141) are respectively welded and connected to the shells of a plurality of the batteries (110).

9. The battery pack according to claim 8, characterized in that: Along the extension direction of the battery (110), the height of the first sampling piece (140) is e, the distance between the connection point on the bent portion (141) close to the inner bottom wall of the tray (200) and the top of the bent portion (141) is f, and e<10f.

10. The battery pack according to any one of claims 4 to 9, characterized in that: The pallet (200) further comprises a side beam (250), wherein the side beam (250) is connected to the end beam (240) at an angle, and in the height direction of the pallet (200), the top surface of the side beam (250) is higher than the top surface of the end beam (240).

11. The battery pack according to claim 10, characterized in that: An inclined transition surface (251) is provided on the side beam (250), and the top surface of the side beam (250) is connected to the top surface of the end beam (240) via the transition surface (251).

12. The battery pack according to claim 11, characterized in that: The angle formed between the transition surface (251) and the top surface of the side beam (250) is α, and 120°≤α≤180°.

13. The battery pack according to claim 12, characterized in that: A support plate (252) is provided on the side of the transition surface (251) facing the accommodating cavity (210).

14. The battery pack according to claim 13, characterized in that: The support plate (252) is provided with reinforcing ribs (253), and the reinforcing ribs (253) extend in the height direction of the tray (200).

15. The battery pack according to any one of claims 4 to 14, characterized in that: The battery pack (100) has a second end opposite to the first end. The sampling component further comprises a circuit board (150) and a plurality of second sampling sheets (160). The circuit board (150) is connected to the second end of the battery pack (100) via the second sampling sheets (160).

16. The battery pack according to claim 15, characterized in that: A plurality of the second sampling pieces (160) are respectively located at the top and bottom of the circuit board (150), and the second sampling piece (160) located at the top of the circuit board (150) is connected to the connecting piece (170) at the second end; The second sampling sheet (160) located at the bottom end of the circuit board (150) is connected to the shell of the battery (110).

17. The battery pack according to claim 15 or 16, characterized in that: The battery pack (100) further comprises a plurality of brackets (180), wherein the plurality of brackets (180) are respectively located at two ends of the battery (110), and the brackets (180) are used to fix the battery (110); And / or, the battery pack (100) further comprises a plurality of protective covers (190), wherein the plurality of protective covers (190) are respectively arranged at the first end and the second end, wherein the protective cover (190) located at the first end is used to protect the functional board (130), and the protective cover (190) located at the second end is used to protect the circuit board (150).

18. The battery pack according to any one of claims 10 to 17, characterized in that: There are two end beams (240), the two end beams (240) are respectively a front beam (241) and a rear beam (242) arranged opposite to each other, and two opposite side beams (250) are respectively connected between the front beam (241) and the rear beam (242) to form a frame (230) to enclose the accommodating cavity (210); There are a plurality of battery packs (100), two of the battery packs (100) being spaced apart in a direction from the front beam (241) to the rear beam (242), and the front beam (241) being opposite to a first end of one of the two battery packs (100), and the rear beam (242) being opposite to a first end of another of the two battery packs (100).

19. The battery pack according to claim 18, characterized in that: It also comprises a cover plate (300), wherein a connection surface is provided on a surface of the cover plate (300) facing the frame (230), wherein the connection surface comprises a front sealing surface (310), a rear sealing surface (320) and two side sealing surfaces (330), wherein the front sealing surface (310) is connected to the top surface of the front beam (241), the rear sealing surface (320) is connected to the top surface of the rear beam (242), and the side sealing surface (330) is connected to the top surface of the side beam (250).

20. The battery pack according to claim 19, characterized in that: An annular groove (231) is provided on the top surface of the frame (230) surrounding the accommodating cavity (210), and the annular groove (231) is used to accommodate sealant so that the top surface of the frame (230) and the connecting surface of the cover plate (300) form a seal.

21. The battery pack according to claim 19 or 20, characterized in that: A heat exchange channel is provided in the cover plate (300), and a heat exchange medium is circulated in the heat exchange channel, and the heat exchange medium is used to exchange heat for the battery pack (100).

22. The battery pack according to any one of claims 19 to 21, characterized in that: An insulating film is provided on a surface of the cover plate (300) facing the accommodating cavity (210), and the insulating film is used for high temperature resistance; And / or, an anti-corrosion layer is provided on a surface of the cover plate (300) facing away from the accommodating cavity (210).

23. A method for manufacturing a battery pack, characterized in that: The method comprises: Providing a tray (200), wherein the tray (200) comprises a receiving cavity (210); A battery pack (100) is provided, wherein the battery pack (100) has a first end and a second end that are arranged opposite to each other, the first end having a welding area (120), the battery pack (100) being placed in the receiving cavity (210) of the tray (200) in a forward-placed manner, the first end being opposite to an end beam (240) of the tray (200), and the top surface of the end beam (240) being lower than at least a portion of the welding area (120); A functional board (130) is installed on the welding area (120) at the first end, and the welding area (120) at the first end is connected to the functional board (130) via a first sampling sheet (140).

24. The method for manufacturing a battery pack according to claim 23, characterized in that: Each of the battery packs (100) comprises two edge modules (410), the two edge modules (410) are arranged opposite to each other, and each of the edge modules (410) comprises a plurality of batteries (110); Before the battery pack (100) is placed in the receiving cavity (210) of the tray (200) in a forward-facing manner, the battery pack (100) comprises: A circuit board (150) is installed at the second end of each edge module (410), and the two edge modules (410) on which the circuit board (150) is installed are respectively placed forwardly in the accommodating cavity (210) of the tray (200) close to the side beams (250) of the battery pack.

25. The method for manufacturing a battery pack according to claim 24, characterized in that: Each of the battery packs (100) further comprises a middle module (420), the middle module (420) comprising an even number of batteries (110), and the middle module (420) is located between the two edge modules (410); Before the battery pack (100) is placed in the receiving cavity (210) of the tray (200) in a forward-facing manner, the battery pack (100) further comprises: The circuit board (150) is mounted on the second end of the middle module (420), and the middle module (420) on which the circuit board (150) is mounted is placed between the two edge modules (410) in a forward-facing manner.

26. The method for manufacturing a battery pack according to claim 25, characterized in that: Before the functional board (130) is installed on the welding area (120) of the first end, the method comprises: The pole on the first end of the edge module (410) and the pole on the first end of the middle module (420) are connected in series via a plurality of connectors (170); The first sampling piece (140) located at the top end of the functional board (130) is connected to the first welding area (121) on the connecting piece (170) at the first end, and the first sampling piece (140) located at the bottom end of the functional board (130) is connected to the second welding area (122) on the first end.

27. The method for manufacturing a battery pack according to claim 26, characterized in that: After the functional board (130) is mounted on the first end of the battery pack (100), the battery pack (100) further comprises: A cover plate (300) is provided, wherein the cover plate (300) is disposed on the tray (200), and the cover plate (300) is connected to a frame (230) of the tray (200) via a fastener.

28. An electrical equipment, characterized in that: include: An electrical device, and a battery pack manufactured by the battery pack described in any one of claims 1 to 22 or the battery pack manufacturing method described in any one of claims 23 to 27, wherein the battery pack is connected to the electrical device, and the battery pack is used to provide electrical energy to the electrical device.

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