Battery pack and electric device

Abstract

The utility model provides a battery pack and a power utilization device, the battery pack comprises a plurality of single batteries, a sampling assembly and a cover plate, and the plurality of single batteries are stacked along a preset direction; the sampling assembly comprises busbars and a circuit board, two opposite side edges of the circuit board extend in a preset direction, and the plurality of busbars are arranged at intervals along at least one side edge of the circuit board; the cover plate is arranged on one side surface of the plurality of single batteries and comprises a top plate and a side plate surrounding the peripheral side of the top plate, the top plate and the side plate form a storage cavity, and the plurality of busbars and the circuit board are arranged in the storage cavity; the busbar and the circuit board are detachably fixed to the top plate. According to the invention, the sampling assembly composed of the plurality of busbars and the circuit board is integrated into the accommodating cavity of the cover plate, so that the space utilization rate of the battery pack is improved, the cover plate, the busbars and the circuit board are integrated together to form a modularized whole, and the productivity efficiency of a battery pack production line is improved. Meanwhile, the busbar and the circuit board are detachably fixed to the top plate, a welding procedure is not needed, and the requirement of the battery pack for welding equipment can be lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and an electrical device. Background Art

[0002] With the booming energy storage market in recent years, energy storage battery packs have gradually shifted from traditional module installation to high-density integrated CTP structures. This can greatly improve the utilization efficiency of battery pack space and increase the efficiency of battery pack assembly capacity. Therefore, how to make battery packs more integrated and modular is an urgent problem to be solved in the battery field. Utility Model Content

[0003] The purpose of this application is to provide a battery pack and an electric device to solve the technical problem of low integration of battery packs in the prior art. The preferred technical solutions among the many technical solutions provided by this utility model can produce many technical effects as described below.

[0004] To achieve the above purpose, the technical solution adopted in this application is:

[0005] In a first aspect, the present application provides a battery pack, comprising:

[0006] Battery cells, multiple battery cells are stacked along a preset direction;

[0007] The sampling component includes a bus and a circuit board, the two opposite sides of the circuit board extend in a preset direction, and a plurality of bus bars are arranged at intervals along at least one side of the circuit board;

[0008] A cover plate is arranged on one side of the plurality of battery cells, comprising a top plate and a side plate arranged around the top plate, wherein the top plate and the side plate form a storage cavity, and the plurality of bus bars and circuit boards are arranged in the storage cavity;

[0009] The busbar and the circuit board are detachably fixed to the top plate.

[0010] In some embodiments of the present application, the busbar includes a buffer portion, the buffer portion is provided with a first connection hole, and the circuit board is provided with a second connection hole;

[0011] The top plate is provided with a first positioning column for positioning the busbar and a second positioning column for positioning the circuit board, the first positioning column is provided with a first positioning hole, and the second positioning column is provided with a second positioning hole;

[0012] The first positioning member is inserted into the first connection hole of the bus bar and the first positioning hole of the first positioning column and is clamped with the first positioning column to clamp the bus bar onto the first positioning column;

[0013] The second positioning member is disposed through the second connecting hole of the circuit board and the second positioning hole of the second positioning column to fix the circuit board to the second positioning column.

[0014] In some embodiments of the present application, the first positioning member includes a positioning pin having a slot provided on the positioning pin, and the first positioning column has a clamping member on the outer edge of the first positioning hole. When the positioning pin is passed through the first connecting hole and the first positioning hole, the clamping member is clamped in the slot.

[0015] In some embodiments of the present application, the buffer portion is arranged to protrude toward the top plate, at least one first connecting hole is provided on the buffer portion, at least one first positioning column corresponding to the first connecting hole is provided on the top plate, the first positioning member includes at least one positioning pin corresponding to the first positioning column, and when the first positioning member includes at least two positioning pins, the ends of all the positioning pins are connected by a connecting block.

[0016] In some embodiments of the present application, the bus also includes a first connection portion and a second connection portion located on both sides of the buffer portion, the first connection portion and the second connection portion are respectively connected to the poles of two adjacent battery cells, a first support column is provided on the top plate to support the first connection portion and the second connection portion of the bus, and a first through hole exposing a portion of the first support column is respectively provided on the first connection portion and the second connection portion.

[0017] In some embodiments of the present application, the circuit board covers multiple battery cells along a preset direction, and avoidance holes are provided at the positions of the explosion-proof valves of the battery cells on the circuit board. The second connection holes are respectively arranged at both ends of the circuit board perpendicular to the preset direction and multiple holes are arranged along the preset direction.

[0018] In some embodiments of the present application, it also includes:

[0019] The shell has a housing cavity, in which a limiting groove for limiting each battery cell is provided, and the shell is fastened to the cover plate;

[0020] An elastic pad is arranged at the bottom of the limiting groove.

[0021] In some embodiments of the present application, the busbar is electrically connected to the circuit board via a collection sheet.

[0022] The battery pack also includes positive and negative output connecting plates, which are electrically connected to the circuit board through a collecting plate. A second supporting column is provided on the top plate to support the positive and negative output connecting plates. The positive and negative output connecting plates are provided with a second through hole corresponding to the second supporting column and exposing a portion of the second supporting column.

[0023] In some embodiments of the present application, it also includes:

[0024] The battery management unit is fixedly arranged on a side of the top plate facing away from the shell, and a connector of the battery management unit is arranged on the same side as a wiring harness connection end of the circuit board.

[0025] In a second aspect, the present application further provides an electrical device, comprising the battery pack described in any one of the embodiments of the first aspect.

[0026] Based on the above technical solution, the battery pack and the power device of the present application have at least the following beneficial technical effects:

[0027] The battery pack of the embodiment of the present application includes a battery cell, a sampling assembly and a cover plate, and a plurality of battery cells are stacked along a preset direction; the sampling assembly includes a bus and a circuit board, and the opposite sides of the circuit board extend along the preset direction, and a plurality of bus bars are arranged at intervals along at least one side of the circuit board; the cover plate is arranged on one side of the plurality of battery cells, and includes a top plate and a side plate arranged around the top plate, and the top plate and the side plate form a storage cavity, and a plurality of bus bars and circuit boards are arranged in the storage cavity; wherein the bus bar and the circuit board are respectively detachably fixed to the top plate. The cover plate of the present application is formed with a storage cavity for accommodating a plurality of bus bars and circuit boards, and the sampling assembly composed of a plurality of bus bars and circuit boards can be integrated into the storage cavity of the cover plate, thereby improving the space utilization rate of the battery pack, integrating the cover plate with the bus bar and the circuit board to form a modular system, improving the production efficiency of the battery pack production line, and providing a digitized module battery pack for subsequent standardized energy storage products. At the same time, the bus bar and the circuit board are detachably fixed to the top plate, and there is no need for a welding process, and only pure assembly is required, which can reduce the requirements of the battery pack for welding equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 A schematic diagram of the three-dimensional structure of a battery pack provided in an embodiment of the present application;

[0030] Figure 2 An exploded view of a battery pack provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the three-dimensional structure of the battery pack provided in an embodiment of the present application after the cover plate and the sampling assembly are integrated;

[0032] Figure 4 A front view of the battery pack provided in an embodiment of the present application after the cover plate and the sampling assembly are integrated;

[0033] Figure 5 An exploded view of the battery pack after the cover plate is integrated according to an embodiment of the present application;

[0034] Figure 6 A schematic diagram of the structure of a sampling component provided in an embodiment of the present application;

[0035] Figure 7 A schematic diagram of the structure of a cover plate in a battery pack provided in an embodiment of the present application;

[0036] Figure 8 A schematic diagram of the structure of a first positioning member provided in an embodiment of the present application;

[0037] Fig. 9 A cross-sectional view of a busbar provided in an embodiment of the present application being fixed to a top plate.

[0038] In the figure: 1-battery management unit; 2-cover plate; 3-sampling assembly; 4-battery monomer; 5-elastic pad; 6-housing; 7-first positioning member; 8-second positioning member; 20-top plate; 21-side plate; 22-storage cavity; 101-connector; 201-first support column; 202-second positioning column; 203-first positioning column; 204-second support column; 211-first fixing part; 301-bus; 302-collection sheet; 303-positive and negative output connecting sheet; 304-circuit board; 305 -wiring harness connection end; 401-explosion-proof valve; 402-pole; 601-limiting groove; 602-second fixing part; 701-slot; 702-locating pin; 703-connecting block; 2021-second locating hole; 2031-first locating hole; 2032-clamp; 3011-first connecting part; 3012-second connecting part; 3013-buffer part; 3014-first connecting hole; 3015-first through hole; 3031-second through hole; 3041-avoidance hole; 3042-second connecting hole. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0041] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and 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 should not be understood as a limitation on the present application.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] With the hot energy storage market in recent years, energy storage battery packs have gradually changed from traditional module installation to high-density integrated CTP structure, so as to greatly improve the utilization efficiency of battery pack space and the efficiency of battery pack assembly production line. In related technologies, the busbars in many CTP structure battery packs usually adopt welding or special structural contact, which hinders the repair of battery cells in the battery pack and increases maintenance costs. With the increasingly fierce cost competition in the current market, it is necessary to optimize the installation form of the busbars in the battery pack to achieve the purpose of reducing costs and improving assembly effects.

[0044] In order to improve the level of integration of battery packs in related technologies, the present application provides a battery pack, including battery cells, sampling components and cover plates, wherein a plurality of battery cells are stacked along a preset direction; the sampling components include a bus and a circuit board, the opposite side edges of the circuit board extend along a preset direction, and a plurality of bus bars are arranged at intervals along at least one side edge of the circuit board; the cover plate is arranged on one side of the plurality of battery cells, including a top plate and side plates arranged around the top plate, the top plate and the side plates form a storage cavity, and a plurality of bus bars and circuit boards are arranged in the storage cavity; wherein the bus bars and the circuit board are respectively detachably fixed to the top plate.

[0045] The cover of the battery pack of the present application is formed with a storage cavity for accommodating multiple buses and circuit boards. The sampling assembly composed of multiple buses and circuit boards can be integrated into the storage cavity of the cover, which improves the space utilization of the battery pack. The cover is integrated with the bus and circuit board to form a modular structure, which improves the efficiency of the battery pack production line and provides a digitized modular battery pack for subsequent standardized energy storage products. At the same time, the bus and circuit board are detachably fixed to the top plate, which does not require welding process, only pure assembly is required, which can reduce the requirements of the battery pack for welding equipment, and also improve the convenience of maintenance and reduce maintenance costs.

[0046] The battery pack of the present application is suitable for power batteries, energy storage batteries, electronic devices or mechanical devices.

[0047] The technical solution of the present application is described in detail below in conjunction with the accompanying drawings.

[0048] Please refer to Figure 1 and Figure 2 The embodiment of the present application provides a battery pack, including a battery cell 4, a sampling assembly 3 and a cover plate 2, wherein a plurality of battery cells 4 are stacked along a preset direction; the sampling assembly 3 includes a bus 301 and a circuit board 304, the opposite sides of the circuit board 304 extend along a preset direction, and a plurality of bus bars 301 are arranged at intervals along at least one side of the circuit board 304; the cover plate 2, which is arranged on one side of the plurality of battery cells 4, includes a top plate 20 and a side plate 21 surrounding the top plate 20, the top plate 20 and the side plate 21 form a storage cavity 22, and a plurality of bus bars 301 and the circuit board 304 are arranged in the storage cavity 22; wherein the bus bar 301 and the circuit board 304 are respectively detachably fixed to the top plate 20.

[0049] The battery cell 4 is the smallest unit that makes up the battery pack. Multiple battery cells 4 are stacked in a preset direction, for example Figure 2 In the manner shown, multiple battery cells 4 are arranged in parallel along a preset direction, and the multiple battery cells 4 can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 4 are connected in series and in parallel. Multiple battery cells 4 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by multiple battery cells 4 is accommodated in the shell 6. The sampling component 3 is a device for collecting sampling signals of the battery cells 4 and transmitting the sampling signals to the battery management unit 1. The sampling signal can be an electrical signal that characterizes the working parameters of the battery cells 4, such as: voltage signal, temperature signal, internal resistance signal, etc. The cover plate 2 covers the shell 6, and the cover plate 2 and the shell 6 together define a storage space for accommodating multiple battery cells 4.

[0050] In the technical solution of the embodiment of the present application, the cover plate 2 of the present application is formed with a storage cavity 22 for accommodating multiple bus bars 301 and circuit boards 304. All bus bars 301 and circuit boards 304 can be integrated into the storage cavity 22 of the cover plate 2 to improve the space utilization of the battery pack. The cover plate is integrated with the bus bars and circuit boards to form modularization, which improves the production efficiency of the battery pack production line and can provide a digitized module battery pack for subsequent standardized energy storage products. At the same time, the bus bars and circuit boards can be detachably fixed to the top plate, reducing the requirements of the battery pack for welding equipment, so that the installation requirements of the battery pack of the present application can be eliminated without welding, and only pure assembly is required. At the same time, the use of auxiliary materials is reduced to achieve the purpose of cost reduction.

[0051] In some embodiments, please refer to Figure 2 , multiple bus bars 301 are arranged at intervals on both sides of the preset direction of the circuit board 304, so as to electrically connect the poles 402 of multiple battery cells 4 to form a series, parallel or mixed connection. The circuit board 304 and the bus bars 301 are arranged reasonably to facilitate the collection of sampling signals of each battery cell 4 through the circuit board 304.

[0052] In some embodiments, Figure 5 and Figure 6 As shown, the bus 301 includes a buffer portion 3013, a first connecting hole 3014 is provided on the buffer portion 3013, and a second connecting hole 3042 is provided on the circuit board 304; a first positioning column 203 for positioning the bus 301 and a second positioning column 202 for positioning the circuit board 304 are provided on the top plate 20, a first positioning hole 2031 is provided on the first positioning column 203, and a second positioning hole 2021 is provided on the second positioning column 202; the first positioning member 7 is passed through the first connecting hole 3014 of the bus 301 and the first positioning hole 2031 of the first positioning column 203 and is clamped with the first positioning column 203 to clamp the bus 301 to the first positioning column 203; the second positioning member 8 is passed through the second connecting hole 3042 of the circuit board 304 and the second positioning hole 2021 of the second positioning column 202 to fix the circuit board 304 to the second positioning column 202.

[0053] Among them, the bus 301 is a component used to connect the poles 402 of the battery cells 4, so that the battery cells 4 form a series, parallel or mixed relationship. The circuit board 304 can be a circuit board formed by integrating multiple sampling circuits that can transmit electrical signals. The first positioning column 203 and the second positioning column 202 are positioning structures arranged in the storage cavity 22. One end of the first positioning column 203 and the second positioning column 202 is fixed to the top plate 20, and the other end of the first positioning column 203 and the second positioning column 202 extends in a direction away from the top plate 20. The first positioning member 7 can be a plastic member. The second positioning member 8 can be a plastic screw.

[0054] In the technical solution of the embodiment of the present application, through the above-mentioned setting, the first positioning member 7 is penetrated through the first connection hole 3014 of the bus 301 and the first positioning hole 2031 of the first positioning column 203 and is clamped with the first positioning column 203 to clamp the bus 301 to the first positioning column 203; thereby realizing the detachable connection between the bus 301 and the top plate 20, eliminating the welding method of the bus 301, facilitating installation and maintenance, and reducing costs. The second positioning member 8 is penetrated through the second connection hole 3042 of the circuit board 304 and the second positioning hole 2021 of the second positioning column 202 to fix the circuit board 304 to the second positioning column 202, thereby realizing the detachable connection between the circuit board 304 and the top plate 20, reducing the requirements for welding equipment required for the battery pack during the battery pack production process, so that the installation of the battery pack of the present application does not require welding, only a pure assembly process is required, reducing maintenance costs, and facilitating the replacement of parts. The busbar 301 and the circuit board 304 are integrated into the cover plate 2 by using the first positioning member 7 and the second positioning member 8, so that the cover plate 2 is modularized, which can reduce the damage of the sampling component caused by substandard packaging or external factors during transportation, thereby reducing the rework rate. Even if the sampling component has an abnormality, it can be quickly replaced and repaired, which can minimize the situation of production line shutdown.

[0055] In some embodiments, please refer to Figure 8 and Fig. 9 The first positioning member 7 includes a positioning pin 702, on which a slot 701 is provided. The first positioning column 203 is provided with a clamping member 2032 in the first positioning hole 2031. When the positioning pin 702 passes through the first connecting hole 3014 and the first positioning hole 2031, the clamping member 2032 is clamped in the slot 701.

[0056] The card slot 701 may be formed by a depression of the outer peripheral wall around the positioning pin 702. In some embodiments, the card member 2032 is formed in the first positioning hole 2031 of the first positioning column 203 and is located at the opening edge of the first positioning hole 2031. The first positioning column 203 may be an injection molded part or a die-cast part and may have elastic properties to facilitate the installation of the positioning pin 702. In some embodiments, the card slot 701 is set at a position that at least allows the bus 301 to be pressed between the first positioning member 7 and the first positioning column 203.

[0057] In the technical solution of the embodiment of the present application, the first positioning member 7 is passed through the first connecting hole 3014 of the bus 301 and the first positioning hole 2031 of the first positioning column 203 through the positioning pin 702, so that the clamping member 2032 is engaged in the clamping slot 701, so that the fixation of the bus 301 and the first positioning column 203 is more stable and will not loosen.

[0058] In some embodiments, please refer to Figure 5 The buffer portion 3013 is protruded toward the top plate 20, and at least one first connecting hole 3014 is provided on the buffer portion 3013. At least one first positioning column 203 corresponding to the first connecting hole 3014 is provided on the top plate 20. The first positioning member 7 includes at least one positioning pin 702 corresponding to the first positioning column 203. When the first positioning member 7 includes at least two positioning pins 702, the ends of all the positioning pins 702 are connected by a connecting block 703.

[0059] In the technical solution of the embodiment of the present application, the buffer portion 3013 is arranged to protrude toward the top plate 20. On the one hand, it is convenient to fix the bus 301 to the first positioning column 203 through the first positioning member 7. On the other hand, the setting of the buffer portion 3013 can play an effective buffering role for the bus 301 when the battery cell expands with the increase of the number of charge and discharge cycles, and it is not easy for the bus 301 to be damaged by stress, thereby improving the service life of the bus. When the first positioning member 7 includes at least two positioning pins 702, the ends of all the positioning pins 702 are connected by the connecting block 703. When the positioning pin 702 is clamped into the card slot 701 through the clamp 2032, the connecting block 703 covers and presses on the buffer portion 3013 of the bus 301 to ensure that the bus will not loosen and improve the stability of the bus 301 fixed to the top plate 20.

[0060] In some embodiments, please refer to Figure 3 , Figure 5 , Figure 6 and Figure 7 The buffer portion 3013 may be provided with two first connecting holes 3014, the top plate 20 may be provided with two first positioning columns 203 corresponding to the number and positions of the two first connecting holes 3014, the first positioning member 7 has two positioning pins 702 corresponding to the number and positions of the first positioning columns 203, the two positioning pins 702 are connected by a connecting block 703, when the positioning pins 702 are clamped into the card slot 701 through the clamping member 2032, the connecting block 703 is pressed against the buffer portion 3013 of the bus 301 to ensure that the bus will not loosen. The buffer portion 3013 is arranged in the middle of the length direction of the bus 301, and the arrangement direction of the two first connecting holes 3014 is perpendicular to the length direction of the bus 301, so that the connecting block 703 can press the bus 301 in the direction perpendicular to the length direction of the bus 301, ensuring that it can be evenly pressed on the bus 301, and it is also convenient to connect the other parts of the bus 301 that are not pressed and the poles 402 of two adjacent battery cells 4, avoiding interference from the connecting block 703 and the positioning pin 702.

[0061] In some embodiments, please refer to Figure 6The busbar 301 also includes a first connection portion 3011 and a second connection portion 3012 located on both sides of the buffer portion 3013. The first connection portion 3011 and the second connection portion 3012 are respectively connected to the poles 402 of two adjacent battery cells 4. A first support column 201 for supporting the first connection portion 3011 and the second connection portion 3012 of the busbar 301 is provided on the top plate 20. First through holes 3015 exposing a portion of the first support column 201 are respectively provided on the first connection portion 3011 and the second connection portion 3012.

[0062] In the technical solution of the embodiment of the present application, the first connection part 3011 and the second connection part 3012 of the busbar 301 are respectively connected to the poles 402 of two adjacent battery cells 4, so as to realize the series connection, parallel connection or mixed connection between the two adjacent battery cells 4. A first support column 201 for supporting the first connection part 3011 and the second connection part 3012 is provided on the top plate 20, so as to support the first connection part 3011 and the second connection part 3012 when the busbar 301 is fixed to the first positioning column 203, so that the first connection part 3011 and the second connection part 3012 can be more stably contacted and connected with the poles 402 of the battery cell 4. At the same time, a first through hole 3015 exposing a part of the first support column 201 is respectively provided on the first connection part 3011 and the second connection part 3012, so as to facilitate the observation of the first support column 201 below during installation, and a mark can be made on the first support column 201 to realize a foolproof design and improve the convenience of installation.

[0063] In some embodiments, please refer to Figure 2 The circuit board 304 covers multiple battery cells 4 along a preset direction, and an avoidance hole 3041 is provided on the circuit board 304 at a position corresponding to the explosion-proof valve 401 of the battery cell 4. The second connection holes 3042 are respectively arranged at both ends of the circuit board 304 perpendicular to the preset direction and are arranged in multiple numbers along the preset direction.

[0064] The second connection holes 3042 are respectively arranged at two ends of the circuit board 304 perpendicular to the preset direction and arranged in a plurality along the preset direction, which can be understood as the plurality of second connection holes 3042 are arranged at intervals on both sides of the circuit board 304 along the preset direction. The preset direction can be the length direction of the circuit board 304.

[0065] In the technical solution of the embodiment of the present application, a plurality of second connection holes 3042 are provided on both sides of the circuit board 304 along the preset direction, so that the circuit board 304 can be positioned on the second positioning column 202 on both sides along the preset direction through the second positioning member 8, so that the circuit board 304 can be more stably fixed to the top plate 20. The circuit board 304 is provided with an avoidance hole 3041 at the position corresponding to the explosion-proof valve 401 of the battery cell 4, so as to provide a gas discharge hole for the battery cell 4 when thermal runaway occurs, so that the battery cell 4 will not break through the circuit board and cause a short circuit when thermal runaway occurs. Among them, the circuit board 304 is a PCB board with a certain hardness, so that after the circuit board 304 is fixed to the second positioning column 202 by the second positioning member 8, the circuit board 304 can be kept fixed without deformation or contacting the top plate.

[0066] Please refer to Figure 2 In some embodiments, the battery pack further comprises:

[0067] The shell 6 has a containing cavity, in which a limiting groove 601 for limiting each battery cell 4 is provided. The shell 6 is fastened to the cover plate 2 ; an elastic pad 5 is provided at the bottom of the limiting groove 601 .

[0068] The shell 6 may be a hollow structure with one end open, and the cover plate 2 covers the open side of the shell 6, so that the cover plate 2 and the shell 6 define a receiving space together. The cover plate 2 and the shell 6 may be injection molded parts or die-cast parts. A crossbeam and a longitudinal beam are arranged in the receiving cavity of the shell 6, and the crossbeam and the longitudinal beam are arranged crosswise to form a limit groove 601 for accommodating each battery cell 4. The elastic pad 5 may be an elastic silicone pad made of a low-density, high-recovery flexible material with a compression permanent deformation of ≤5%.

[0069] In the technical solution of the embodiment of the present application, a limiting groove 601 for limiting each battery cell 4 is provided in the accommodating cavity of the shell 6. The limiting groove 601 can provide a limiting effect for the battery cell 4, so that when the cover plate 2 and the shell 6 are fixed, it is convenient for the bus 301 to be aligned with the pole 402 of the battery cell. So that the pole 402 of the battery cell 4 is higher than the theoretical installation size. The elastic pad 5 provided at the bottom of the limiting groove 601 can make the battery cell 4 and the bus 301 closely fit and contact, provide the battery cell 4 with a close contact with the bus 301, and reduce the problem of virtual contact or contact heating caused by virtual contact.

[0070] In some embodiments, when the housing 6 is an injection-molded part, an insulating material is disposed around the battery cells 4 to improve the insulation of the battery cells 4 and avoid short circuits between the battery cells 4 .

[0071] In some embodiments, please refer to Figure 2 or Figure 6The bus 301 and the circuit board 304 are electrically connected via the collection sheet 302 .

[0072] In some embodiments, the collection sheet 302 may be a nickel sheet. The collection sheet 302, the bus bar 301 and the circuit board 304 may be sized by laser welding.

[0073] In the technical solution of the embodiment of the present application, the bus 301 and the circuit board 304 are electrically connected through the acquisition sheet 302, so as to connect the bus 301 pole ear through the acquisition sheet 302 to collect the sampling signal of the battery cell, and transmit it to the circuit board 304 through the acquisition sheet 302 and transmit the sampling signal to the battery management unit 1.

[0074] In some embodiments, please refer to Figure 6 The sampling component 3 also includes a positive and negative output connecting piece 303, and the positive and negative output connecting piece 303 is electrically connected to the circuit board 304 through the collecting piece 302. A second supporting column 204 for supporting the positive and negative output connecting piece 303 is provided on the top plate 20, and a second through hole 3031 corresponding to the second supporting column 204 and exposing a portion of the second supporting column 204 is provided on the positive and negative output connecting piece 303.

[0075] In the technical solution of the embodiment of the present application, the positive and negative output connecting pieces 303 are electrically connected to the circuit board 304 through the collecting piece 302, so as to realize the electrical connection between the circuit board 304 and the positive and negative output connecting pieces 303. A second supporting column 204 is provided on the top plate 20 to support the positive and negative output connecting pieces 303, and plays a supporting role for the positive and negative output connecting pieces 303, so that the positive and negative output connecting pieces 303 can be more stably connected to the pole 402 of the battery cell 4. At the same time, a second through hole 3031 is provided on the positive and negative output connecting pieces 303 to expose part of the second supporting column 204, so as to facilitate the observation of the second supporting column below during installation, and the second supporting column can be marked to realize a fool-proof design.

[0076] In some embodiments, the positive and negative output connecting pieces 303 and the collecting piece 302 may be made of aluminum sheet AL1060.

[0077] In some embodiments, the battery pack further includes: a battery management unit 1, which is fixed to the side of the top plate 20 away from the housing 6, and the connector 101 of the battery management unit 1 is arranged on the same side as the wiring harness connection end 305 of the circuit board 304. The battery management unit 1 is used to manage multiple battery cells 4 to detect the working status of each internal battery cell. The connector 101 of the battery management unit 1 and the wiring harness connection end 305 of the circuit board 304 are arranged on the same side, which can be understood as the connector 101 and the wiring harness connection end 305 of the circuit board 304 are located on the same side of the cover plate 2.

[0078] In the technical solution of the embodiment of the present application, the connector 101 of the battery management unit 1 and the wiring harness connection end 305 of the circuit board 304 are arranged on the same side so that the communication harness connects the connector 101 of the battery management unit 1 to the wiring harness connection end 305 of the circuit board 304, thereby reducing the use of the wiring harness and reducing the cost. Specifically, the connector 101 of the battery management unit 1 and the wiring harness connection end 305 of the circuit board 304 are arranged correspondingly, and further, the connector 101 of the battery management unit 1 is arranged above the wiring harness connection end 305 of the circuit board 304, thereby further simplifying the wiring harness connection.

[0079] In some embodiments, reference Figure 2 and Figure 3 As shown, a first fixing portion 211 is provided on the edge side of the cover plate 2, and a second fixing portion 602 corresponding to the first fixing portion 211 is provided on the opening edge of the shell 6. Fasteners are inserted through the first fixing portion 211 and the second fixing portion 602 so that the cover plate 2 integrated with the sampling component can be pressed onto the shell 6, and through interference fit, it is ensured that the pole 402 of the battery cell 4 can be in close contact with the bus 301.

[0080] In some embodiments, the fastener may be a bolt, and the first fixing portion 211 and the second fixing portion 602 may be bolt holes. By connecting the cover plate 2 to the housing 6 by bolts, the locking force of the bolts provides downward pressure to the busbar toward the battery cell, and through interference fit, it is ensured that the pole 402 of the battery cell 4 can be in close contact with the busbar 301.

[0081] The battery pack of the embodiment of the present application can first connect the bus 301, the positive and negative output connection pieces 303 and the circuit board 304 in the sampling assembly 3 through the collection piece 302, and then integrate the sampling assembly 3 onto the cover plate 2 using the first positioning piece 7 and the second positioning piece 8, so that the sampling assembly 3 and the cover plate 2 form a modular whole, and then install the cover plate 2 onto the housing 6, so that the sampling assembly 3 is in close contact with the battery cell 4 in the housing 6. Finally, the battery management unit 1 is installed on the housing 6, and the connector 101 of the battery management unit 1 is connected to the harness connection end 305 of the circuit board 304 using the communication harness, and the installation of the battery pack is completed.

[0082] In a second aspect, the present application further provides an electrical device, comprising the battery pack described in any one of the first aspects above. The electrical device may be an electrical device that uses a battery as a power source or various energy storage systems that use a battery as an energy storage element. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0083] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack, characterized in that: include: A battery cell (4), wherein a plurality of the battery cells (4) are stacked along a preset direction; A sampling component (3) comprises a bus (301) and a circuit board (304), wherein two opposite sides of the circuit board (304) extend along the preset direction, and a plurality of the bus bars (301) are arranged at intervals along at least one side of the circuit board (304); A cover plate (2) is arranged on a side surface of the plurality of battery cells (4), comprising a top plate (20) and a side plate (21) arranged around the top plate (20), wherein the top plate (20) and the side plate (21) form a storage cavity (22), and the plurality of bus bars (301) and the circuit board (304) are arranged in the storage cavity (22); The busbar (301) and the circuit board (304) are respectively detachably fixed to the top plate (20).

2. The battery pack according to claim 1, characterized in that: The busbar (301) comprises a buffer portion (3013), a first connection hole (3014) is provided on the buffer portion (3013), and a second connection hole (3042) is provided on the circuit board (304); The top plate (20) is provided with a first positioning column (203) for positioning the busbar (301) and a second positioning column (202) for positioning the circuit board (304); the first positioning column (203) is provided with a first positioning hole (2031), and the second positioning column (202) is provided with a second positioning hole (2021); The first positioning member (7) is inserted into the first connection hole (3014) of the busbar (301) and the first positioning hole (2031) of the first positioning column (203) and is clamped with the first positioning column (203) so as to clamp the busbar (301) onto the first positioning column (203); The second positioning member (8) is inserted into the second connection hole (3042) of the circuit board (304) and the second positioning hole (2021) of the second positioning column (202) to fix the circuit board (304) to the second positioning column (202).

3. The battery pack according to claim 2, characterized in that: The first positioning member (7) comprises a positioning pin (702), a clamping groove (701) is provided on the positioning pin (702), and the first positioning column (203) is provided with a clamping member (2032) at the outer edge of the first positioning hole (2031), and when the positioning pin (702) is inserted into the first connecting hole (3014) and the first positioning hole (2031), the clamping member (2032) is clamped in the clamping groove (701).

4. The battery pack according to claim 2, characterized in that: The buffer portion (3013) is arranged to protrude toward the top plate (20), and at least one first connecting hole (3014) is provided on the buffer portion (3013). The top plate (20) is provided with at least one first positioning column (203) corresponding to the first connecting hole (3014). The first positioning member (7) includes at least one positioning pin (702) corresponding to the first positioning column (203). When the first positioning member (7) includes at least two positioning pins (702), the ends of all the positioning pins (702) are connected via a connecting block (703).

5. The battery pack according to claim 2, characterized in that: The busbar (301) further comprises a first connection portion (3011) and a second connection portion (3012) located on both sides of the buffer portion (3013); the first connection portion (3011) and the second connection portion (3012) are respectively connected to poles (402) of two adjacent battery cells (4); a first support column (201) for supporting the first connection portion (3011) and the second connection portion (3012) of the busbar (301) is provided on the top plate (20); and first through holes (3015) for exposing a portion of the first support column (201) are respectively provided on the first connection portion (3011) and the second connection portion (3012).

6. The battery pack according to claim 2, characterized in that: The circuit board (304) covers a plurality of battery cells (4) along the preset direction; a avoidance hole (3041) is provided on the circuit board (304) at a position corresponding to the explosion-proof valve (401) of the battery cell (4); and the second connection holes (3042) are respectively arranged at two ends of the circuit board (304) perpendicular to the preset direction and are arranged in plurality along the preset direction.

7. The battery pack according to any one of claims 1 to 6, characterized in that: Also includes: The housing (6) has a housing cavity, wherein a limiting groove (601) for limiting the position of each battery cell (4) is provided in the housing cavity, and the housing (6) is firmly connected to the cover plate (2); An elastic pad (5) is provided at the bottom of the limiting groove (601).

8. The battery pack according to claim 1, characterized in that: The busbar (301) is electrically connected to the circuit board (304) via a collection sheet (302). The sampling assembly (3) further comprises a positive and negative output connection sheet (303), wherein the positive and negative output connection sheet (303) is electrically connected to the circuit board (304) via the collection sheet (302), and a second support column (204) for supporting the positive and negative output connection sheet (303) is provided on the top plate (20), and a second through hole (3031) corresponding to the second support column (204) and exposing a portion of the second support column (204) is provided on the positive and negative output connection sheet (303).

9. The battery pack according to claim 7, characterized in that: Also includes: The battery management unit (1) is fixedly arranged on a side of the top plate (20) facing away from the shell (6), and the connector (101) of the battery management unit (1) is arranged on the same side as the wiring harness connection end (305) of the circuit board (304).

10. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 9.

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