Battery packs and electrical equipment

Abstract

The present application relates to a battery pack and an electrical device, belonging to the technical field of battery packs. The battery pack includes: a housing; a battery cell group, which is arranged in the housing, and the battery cell group includes a plurality of battery cells arranged in a stack; a circuit board, which is located on one side of the battery cell group and is electrically connected to the battery cell group, and components are arranged on the surface of the circuit board away from the battery cell group; a structural member, which is arranged on the surface of the circuit board away from the battery cell group, and the structural member is connected to the circuit board to form a closed space, and the components are located in the closed space. The battery pack has a long service life.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and more specifically, to a battery pack and an electrical device. Background Art

[0002] The capacity of a single battery cell sometimes cannot meet the needs of users. In this case, multiple batteries need to be connected in series or in parallel to form a battery pack. The battery pack consists of a shell, a battery pack and a BMS (BATTERY MANAGEMENT SYSTEM).

[0003] In the development of battery technology, in addition to improving the energy density of the battery pack, how to extend the service life of the battery pack is also a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present application is to provide a battery pack and an electrical device. The battery pack has a long service life.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the present application provides a battery pack, comprising: a shell; a cell group disposed in the shell, the cell group comprising a plurality of stacked cells; a circuit board located on one side of the cell group and electrically connected to the cell group, components being arranged on a surface of the circuit board facing away from the cell group; a structural member disposed on a surface of the circuit board facing away from the cell group, the structural member being connected to the circuit board to form a confined space, and the components being located in the confined space.

[0007] According to the battery pack of the embodiment of the present application, the structural parts are arranged on the surface of the circuit board away from the battery cell group. The structural parts and the circuit board are sealed and connected to form a closed space. The components are located in the closed space. The closed space is not filled with sealant and the sealant cannot enter the closed space, thereby isolating the components from the sealant, reducing the risk of sealant corroding the components, thereby extending the service life of the battery pack.

[0008] According to some embodiments of the present application, the structural member includes a bottom wall and an annular protrusion, the bottom wall having a first surface facing the circuit board and a second surface facing away from the circuit board, the annular protrusion protruding from the first surface, the annular protrusion being connected to the circuit board, and the first surface of the bottom wall, the annular protrusion and the circuit board enclosing the enclosed space.

[0009] In the above solution, the annular protrusion is sealed and connected to the circuit board, so that the annular protrusion, the bottom wall and the circuit board form a closed space to isolate the components from the sealant poured into the housing.

[0010] According to some embodiments of the present application, a seal is provided between the annular protrusion and the circuit board.

[0011] In the above solution, the sealing member is provided so that a sealed connection is formed between the annular protrusion and the circuit board, so that the sealant cannot enter the enclosed space.

[0012] According to some embodiments of the present application, an annular groove is formed on the second surface corresponding to the position of the annular protrusion.

[0013] In the above scheme, the provision of the annular groove can reduce the weight of the structural member, and the structural member can be stamped to form an annular convex portion on one side of the structural member and an annular groove on the other side.

[0014] According to some embodiments of the present application, a first groove communicating with the annular groove is formed on the second surface, and the first groove extends from the edge of the bottom wall to the annular groove.

[0015] In the above scheme, by providing the first groove, the sealant poured into the shell can enter the annular groove from the first groove, so that the sealant can quickly flow into the annular groove to improve the penetration efficiency of the sealant.

[0016] According to some embodiments of the present application, the bottom wall is provided with reinforcing ribs, and the annular groove surrounds the reinforcing ribs.

[0017] In the above scheme, the reinforcing ribs enhance the structural strength of the bottom wall, and the annular groove surrounds the reinforcing ribs, so that the structural strength of the portion of the bottom wall surrounded by the annular groove is higher, reducing the risk of deformation of the portion and squeezing components, thereby improving the safety of the battery pack.

[0018] According to some embodiments of the present application, the first surface includes a central area located within the annular protrusion and an edge area located outside the annular protrusion, and the space between the edge area and the circuit board is filled with sealant.

[0019] In the above solution, the sealant fills the space between the edge area and the circuit board to form a support between the circuit board and the structural member, thereby enhancing the strength of the circuit board, reducing the risk of the circuit board being squeezed and damaged, and improving the safety of the circuit board.

[0020] According to some embodiments of the present application, the structural member further includes a side wall, which extends from an edge of the bottom wall toward the circuit board along a thickness direction of the bottom wall, and at least a portion of the side wall is disposed around the annular protrusion.

[0021] In the above scheme, since a large amount of sealant is poured into the shell, the sealant submerges the structural parts, and the side walls are arranged around the circuit board. The side walls can constrain the sealant between the side walls and the annular protrusions, so that after the sealant solidifies, it forms a support between the circuit board and the structural parts, thereby enhancing the strength of the circuit board.

[0022] According to some embodiments of the present application, the side wall is provided with a first opening.

[0023] In the above solution, the first opening is provided so that the sealant can enter the interior of the structural member from the first opening, thereby facilitating the injection of the sealant.

[0024] According to some embodiments of the present application, the shell is provided with a second opening, and the second opening is arranged opposite to the first opening.

[0025] In the above solution, the second opening is arranged opposite to the first opening to facilitate the injection of the sealant so that the sealant can flow smoothly into the structural member.

[0026] According to some embodiments of the present application, the circuit board has a third surface facing the battery cell group, and along the thickness direction of the bottom wall, an end of the side wall facing away from the bottom wall exceeds the third surface, and when observed along the direction of the battery cell stacking, the projection of the side wall overlaps with the projection of the battery cell; the structural member is filled with sealant, and the sealant surface exceeds the third surface and does not exceed the end of the side wall away from the bottom wall.

[0027] In the above scheme, the side wall and the bottom wall limit the position of the sealant in the structural member, and the side wall limits the height of the sealant; the sealant surface exceeds the third surface to facilitate the sealing and waterproofing of the electrical connection parts of the circuit board, thereby improving the safety of the battery pack.

[0028] According to some embodiments of the present application, the bottom wall includes a main body and an extension portion extending from the main body, and when observed along the thickness direction of the structural member, the projection of the battery cell group on the bottom wall is located within the main body, the extension portion protrudes from the end surface of the battery cell group, and the side wall includes a first portion arranged at the edge of the main body and a second portion arranged at the edge of the extension portion, and an end of the second portion away from the bottom wall forms the first opening.

[0029] In the above solution, the second part defines a first opening to restrict the sealant so as to facilitate the sealant to flow into the space enclosed by the first part of the side wall and the body.

[0030] According to some embodiments of the present application, the shell includes a first accommodating cavity and a second accommodating cavity, the battery cell group, the circuit board and the structural component are all located in the first accommodating cavity, the second accommodating cavity is connected to the first accommodating cavity through a third opening, and the third opening is arranged corresponding to the first opening and the second opening.

[0031] In the above scheme, the second accommodating cavity and the first accommodating cavity are two chambers inside the shell, and the second accommodating cavity can accommodate components such as wiring harnesses to separate them from components such as battery cell groups, circuit boards and structural parts for easy management.

[0032] According to some embodiments of the present application, a guide plate is provided in the second accommodating cavity, and the guide plate is used to guide the sealant entering the second accommodating cavity through the second opening to the third opening.

[0033] In the above solution, the guide plate plays a role of guiding flow and can also prevent the sealant from splashing.

[0034] According to some embodiments of the present application, the battery pack further includes a box body, and the shell is accommodated in the box body.

[0035] In the above scheme, the box body and the shell form a two-layer protection structure, which further protects the battery cell group and the circuit board and extends the service life of the battery pack.

[0036] In a second aspect, the present application provides an electrical device, including a battery pack as provided in the above embodiment.

[0037] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 An exploded view of a battery pack provided in the first embodiment of the present application;

[0040] Figure 2 A schematic diagram of the assembly of the structural member and the circuit board provided in the first embodiment of the present application;

[0041] Figure 3 A cross-sectional view of the assembly state of the structural member and the circuit board provided in the first embodiment of the present application;

[0042] Figure 4 A cross-sectional view of a housing provided in accordance with the first embodiment of the present application;

[0043] Figure 5 for Figure 4 A local enlarged view of point A;

[0044] Figure 6 An exploded view of a battery pack (with a box) provided in the first embodiment of the present application;

[0045] Figure 7 A schematic diagram of the structure of the structural components of a battery pack provided in the second embodiment of the present application;

[0046] Figure 8 A cross-sectional view of a portion of the structure of a battery pack provided in a second embodiment of the present application;

[0047] Fig. 9 An exploded view of a battery pack provided in accordance with the second embodiment of the present application;

[0048] Fig.10 A cross-sectional view of a battery pack provided in accordance with a second embodiment of the present application;

[0049] Fig.11 for Fig.10 A partial enlarged view of point B;

[0050] Fig.12 A schematic diagram of the structure of the structural components of a battery pack provided in the third embodiment of the present application;

[0051] Fig.13 A cross-sectional view of a portion of the structure of a battery pack provided in a third embodiment of the present application;

[0052] Fig.14 for Fig.13 A partial enlarged view of point C.

[0053] Icons: 100-battery pack; 10-housing; 101-first accommodating cavity; 102-second accommodating cavity; 11-first sub-housing; 110-first opening end; 111-step; 12-second sub-housing; 120-second opening end; 13-second opening; 14-third opening; 15-guide plate; 16-sealing tape; 20-cell group; 21-cell; 30-circuit board; 301-third side; 302-fourth side; 31-components; 40-structural parts; 401-enclosed space ;41-bottom wall;411-first surface;4111-central area;4112-edge area;412-second surface;413-reinforcement ribs;414-main body;415-extension portion;42-annular protrusion;43-annular groove;44-first groove;45-side wall;451-first opening;452-first part;453-second part;50-seal;60-wiring harness;70-box;71-first sub-box;72-second sub-box;73-aviation plug;80-sealant. DETAILED DESCRIPTION

[0054] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0056] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0057] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0059] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0060] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "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 connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0061] The battery pack includes a cell group and a BMS. The cell group includes multiple cells. The BMS is used to monitor the status of the cells, intelligently manage and maintain each cell, prevent overcharging and overdischarging of the cells, and extend the service life of the battery pack. The BMS includes a circuit board and components arranged on the circuit board. The components are electrically connected to an external control system to achieve management of the cells (such as detecting the current, voltage or temperature of the cells).

[0062] There are many factors that affect the service life of a battery pack, among which safety risks such as battery pack fire and thermal runaway have a particularly prominent impact on the service life of a battery pack. In the prior art, the causes of battery pack fire and thermal runaway include: 1. Water ingress and short circuit in electrical components lead to excessive temperature; 2. Looseness and corrosion of electrical connection points, and local fracture of connection points due to stress fatigue, which leads to increased local internal resistance and excessive temperature; further, excessive temperature causes thermal runaway of the battery and explosion and fire of the battery pack. Therefore, it is particularly important to solve the connection reliability and waterproofness of the electrical connection position. One of the better methods to achieve sealing and waterproofness of the electrical connection components inside the battery pack and safe and reliable connection points is to inject sealant into the electrical connection position of the battery pack to prevent the electrical connection position from being loosened and damaged by fatigue, and to isolate the air for corrosion.

[0063] Taking soft-pack batteries as an example, sealant is usually poured at the top seal position of the soft-pack batteries (referred to as glue pouring) to solve the problem of the top seal rushing out of the soft-pack batteries. If there is no limiting structure at the top seal position between the aluminum-plastic film and the battery body of the soft-pack batteries during vibration, the battery body will hit the top seal area and cause a short circuit in the battery cell. Glue pouring at the top seal position can solve this problem well. Secondly, sealant is poured into the battery pack shell. The sealant can well fix the BMS board, the battery tab welding points, and the collection nickel sheet welding points to prevent the electrical connection welding points from moving against each other and failing. Thirdly, glue pouring can isolate air and water to prevent corrosion of the electrical connection points (laser welding destroys the anti-corrosion nickel plating of the copper tab and the laser welding alloy layer is easily corroded).

[0064] The inventors found that although the sealant can achieve waterproof sealing of the internal electrical connection parts of the battery pack and prevent the electrical connection positions from loosening and fatigue damage, the sealant will corrode the components on the circuit board of the BMS. At the same time, the solidification of the sealant is also likely to transfer deformation stress to the components, resulting in poor connection reliability between the components and the circuit board. In severe cases, the components may separate from the circuit board, affecting the normal use of the battery pack and shortening the service life of the battery pack.

[0065] In view of this, in order to solve the problem of sealant corroding components on the circuit board and affecting the service life of the battery pack, the inventor designed a battery pack. A structural member is arranged on the side of the circuit board away from the battery cell group. The structural member is sealed and connected to the circuit board to form an enclosed space that prevents the sealant from entering, thereby isolating the components on the circuit board from the sealant and preventing the sealant from corroding the components, thereby extending the service life of the components, thereby extending the service life of the battery pack.

[0066] The battery pack disclosed in the embodiment of the present application can be used in, but not limited to, electric two-wheeled vehicles, electric tools, drones, energy storage devices and other electrical equipment. The battery with the working conditions of the present application can be used as the power supply system of the electrical equipment, which is conducive to improving the charging and discharging safety of the power supply system and the power safety of the electrical equipment.

[0067] The present application provides an electrical device using a battery pack as a power source, and the electrical device may be, but is not limited to, an electronic device, an electric tool, an unmanned aerial vehicle, and an energy storage device. The electronic device may include a mobile phone, a tablet, a laptop computer, etc., and the electric tool may include an electric drill, an electric saw, etc.

[0068] In the embodiment of the present application, the battery pack 100 may include a plurality of battery cells. In the battery pack 100, the plurality of battery cells may be connected in series, in parallel, or in mixed connection, wherein mixed connection means that the plurality of battery cells are connected in both series and in parallel.

[0069] The battery pack 100 further includes a BMS, which includes a circuit board and components disposed on the circuit board. The components may be used, for example, to detect the current, voltage and / or temperature of the battery cell 21 .

[0070] The battery pack 100 may further include a busbar component (not shown), through which multiple cells may be electrically connected to each other to achieve series connection, parallel connection, or mixed connection of multiple cells. The busbar component may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0071] First embodiment

[0072] Please refer to Figures 1 to 3 , Figure 1 An exploded view of a battery pack provided in the first embodiment of the present application, Figure 2 This is a schematic diagram of the assembly of the structural components and the circuit board provided in the first embodiment of the present application. Figure 3 A cross-sectional view of the assembly state of the structural member and the circuit board provided in the first embodiment of the present application. The embodiment of the present application provides a battery pack 100, which includes a housing 10, a battery cell group 20, a circuit board 30 and a structural member 40. The battery cell group 20 is arranged in the housing 10, and the battery cell group 20 includes a plurality of battery cells 21 arranged in a stack. The circuit board 30 is located on one side of the battery cell group 20, the circuit board 30 is electrically connected to the battery cell group 20, and components 31 are arranged on the surface of the circuit board 30 away from the battery cell group 20. The structural member 40 is arranged on the surface of the circuit board 30 away from the battery cell group 20, and the structural member 40 is sealed and connected to the circuit board 30 to form a closed space 401, and the components 31 are located in the closed space 401.

[0073] The stacking of multiple battery cells 21 can save space and improve space utilization.

[0074] The components 31 and the battery cell group 20 are located on both sides of the circuit board 30 in the thickness direction, so as to reasonably utilize the space and avoid interference between the components 31 and the battery cell group 20 .

[0075] The structural member 40 is a component used for sealing connection with the circuit board 30. After the structural member 40 is connected to the circuit board 30, a closed space 401 is formed. The sealant poured into the shell 10 cannot enter the closed space 401, so as to achieve isolation between the components 31 and the sealant in the closed space 401.

[0076] According to the battery pack 100 of the embodiment of the present application, the structural member 40 is arranged on the surface of the circuit board 30 away from the battery cell group 20, the structural member 40 and the component 31 are arranged on the same side of the circuit board 30, the structural member 40 and the circuit board 30 are sealed and connected to form a closed space 401, the component 31 is located in the closed space 401, the closed space 401 is not filled with sealant, and the sealant cannot enter the closed space 401, thereby isolating the component 31 from the sealant, reducing the risk of corrosion of the component 31 due to contact between the sealant and the component 31 and the risk of stress separation of the component 31 due to high and low temperature stress, extending the service life of the component 31, so that the battery pack 100 has a longer service life.

[0077] See also Figure 2 and Figure 3 According to some embodiments of the present application, the structural member 40 includes a bottom wall 41 and an annular protrusion 42, the bottom wall 41 has a first surface 411 facing the circuit board 30 and a second surface 412 away from the circuit board 30, the annular protrusion 42 protrudes from the first surface 411, the annular protrusion 42 is sealed and connected to the circuit board 30, and the first surface 411 of the bottom wall 41, the annular protrusion 42 and the circuit board 30 enclose a closed space 401.

[0078] The bottom wall 41 is a wall constituting the structural member 40 ; the first surface 411 and the second surface 412 may be two opposite surfaces of the bottom wall 41 in the thickness direction X. In the figure, the direction indicated by the letter X is the thickness direction of the bottom wall 41 .

[0079] The annular protrusion 42 is an annular structure protruding from the first surface 411 . The annular protrusion 42 protrudes from the first surface 411 along the thickness direction X of the bottom wall 41 .

[0080] The enclosed space 401 is a space enclosed by the annular protrusion 42, the bottom wall 41 and the circuit board 30. Since the annular protrusion 42 is sealedly connected to the circuit board 30, the enclosed space 401 is independent of the external environment, and the sealant cannot enter the enclosed space 401 through the connection between the annular protrusion 42 and the circuit board 30, so that the components 31 located in the enclosed space 401 are isolated from the sealant injected into the shell 10.

[0081] According to some embodiments of the present application, Figure 3 As shown, a seal 50 is disposed between the annular protrusion 42 and the circuit board 30 .

[0082] The sealing member 50 is a component used to achieve a sealed connection between the annular protrusion 42 and the circuit board 30 . The sealing member 50 may be a sealing foam, a sealing pad or a sealing tape.

[0083] The sealing member 50 is provided to form a sealed connection between the annular protrusion 42 and the circuit board 30 , so that the sealant cannot enter the enclosed space 401 .

[0084] According to some embodiments of the present application, Figure 2 and Figure 3 As shown, the second surface 412 is formed with an annular groove 43 corresponding to the position of the annular protrusion 42 .

[0085] The annular groove 43 is a groove formed on the second surface 412, and along the thickness direction X of the bottom wall 41, the projection of the annular protrusion 42 on the bottom wall 41 overlaps with the annular groove 43. The provision of the annular groove 43 can reduce the weight of the structural member 40. The structural member 40 can be stamped so that the annular protrusion 42 is formed on one side of the structural member 40, and the annular groove 43 is formed on the other side.

[0086] According to some embodiments of the present application, Figure 2 As shown, the second surface 412 is formed with a first groove 44 communicating with the annular groove 43 , and the first groove 44 extends from the edge of the bottom wall 41 to the annular groove 43 .

[0087] The first groove 44 may be a glue guide groove, which extends from the edge of the bottom wall 41 to the annular groove 43 so that the annular groove 43 is connected to the external environment. When the sealant is poured into the housing 10, the sealant can enter the annular groove 43 through the first groove 44.

[0088] There may be a plurality of first grooves 44 , and the plurality of first grooves 44 are arranged at intervals along the extending direction of the annular groove 43 , so as to achieve communication with the annular groove 43 at a plurality of positions.

[0089] When the distance between the second surface 412 and the inner wall of the shell 10 is small, the first groove 44 is provided so that the sealant poured into the shell 10 can enter the annular groove 43 from the first groove 44, so that the sealant can quickly flow into the annular groove 43 to improve the penetration efficiency of the sealant.

[0090] According to some embodiments of the present application, Figure 2 As shown, the bottom wall 41 is provided with a reinforcing rib 413 , and the annular groove 43 surrounds the reinforcing rib 413 .

[0091] The reinforcing rib 413 is a structure formed on the bottom wall 41 for reinforcing the structural strength of the bottom wall 41. The reinforcing rib 413 can be formed by stamping the bottom wall 41, or the reinforcing rib 413 can be a component welded to the bottom wall 41.

[0092] The reinforcing rib 413 enhances the structural strength of the bottom wall 41 , and the annular groove 43 surrounds the reinforcing rib 413 , so that the portion of the bottom wall 41 surrounded by the annular groove 43 has higher structural strength, thereby reducing the risk of deformation of the portion and squeezing the components 31 , thereby improving the safety of the battery pack 100 .

[0093] See also Figure 3 According to some embodiments of the present application, the first surface 411 includes a central area 4111 located inside the annular protrusion 42 and an edge area 4112 located outside the annular protrusion 42 , and the space between the edge area 4112 and the circuit board 30 is filled with sealant 80 .

[0094] The sealant 80 is an adhesive used to fill the gap of the configuration to play a sealing role. It also has the functions of anti-leakage, waterproof, anti-vibration and heat insulation. The sealant 80 can include at least one of polyurethane sealant, chloroprene sealant, epoxy sealant, butyl sealant, and PVC (Polyvinyl chloride) sealant. It is understandable that the sealant 80 can also be other adhesives with the above functions, and the present application does not make specific restrictions on the material of the sealant.

[0095] The central area 4111 and the edge area 4112 are two areas of the first surface 411 separated by the annular protrusion 42. The area within the outline of the annular protrusion 42 is the central area 4111, and the area outside the outline of the annular protrusion 42 is the edge area 4112, that is, the annular protrusion 42 is not disposed at the edge of the first surface 411. In other embodiments, the annular protrusion 42 may be disposed at the edge of the first surface 411.

[0096] The sealant 80 fills the space between the edge area 4112 and the circuit board 30 to form a support between the circuit board 30 and the structural member 40, thereby enhancing the strength of the circuit board 30, reducing the risk of the circuit board 30 being squeezed and damaged, and improving the safety of the circuit board 30.

[0097] See also Figure 1 , and see further Figure 4 , Figure 4 A cross-sectional view of a housing provided for the first embodiment of the present application. According to some embodiments of the present application, the housing 10 includes a first sub-housing 11 and a second sub-housing 12, the first sub-housing 11 and the second sub-housing 12 are sealed and connected to form a first accommodating chamber 101, and the battery cell group 20, the circuit board 30 and the structural member 40 are all located in the first accommodating chamber 101. The first sub-housing 11 and the second sub-housing 12 are two components of the housing 10, the first sub-housing 11 and the second sub-housing 12 are sealed and connected to form the first accommodating chamber 101, and the first accommodating chamber 101 is a space for injecting sealant. The sealant fills the first accommodating chamber 101, but the sealant does not enter the enclosed space 401.

[0098] The battery cell group 20 , the circuit board 30 and the structural member 40 are all located in the first accommodating cavity 101 , and the housing 10 forms a protective structure to protect the battery cell group 20 , the circuit board 30 and the structural member 40 .

[0099] According to some embodiments of the present application, the first sub-shell 11 and the second sub-shell 12 are blister parts to reduce costs. At the same time, the first sub-shell 11 and the second sub-shell 12 have thinner walls to save space and achieve lightweight.

[0100] The housing 10 is provided with a second opening 13, and the second opening 13 can be provided in the first sub-housing 11, or in the second sub-housing 12, or in both the first sub-housing 11 and the second sub-housing 12. Optionally, the second opening 13 is provided in the first sub-housing 11 or the second sub-housing 12. Since the first sub-housing 11 and the second sub-housing 12 are blister parts, the second opening 13 is provided in the first sub-housing 11 or the second sub-housing 12 to avoid the second opening 13 being provided in the opening end of the first sub-housing 11 and the opening end of the second sub-housing 12, thereby ensuring the overall strength of the housing 10. For example, Figure 1 As shown, the second opening 13 is disposed on the first sub-housing 11 .

[0101] See also Figure 1 and Figure 4 , and see further Figure 5 , Figure 5 for Figure 4 According to some embodiments of the present application, the first sub-shell 11 includes a first opening end 110 , the second sub-shell 12 includes a second opening end 120 , the first opening end 110 is sleeved on the second opening end 120 , a step 111 is provided on the inner wall of the first sub-shell 11 , and the second opening end 120 abuts against the step 111 .

[0102] The step 111 is a structure formed on the inner wall of the first sub-housing 11 . The step 111 connects two wall surfaces of the first sub-housing 11 , and the two wall surfaces are not coplanar.

[0103] When the first sub-housing 11 and the second sub-housing 12 are assembled, the inner wall of the first sub-housing 11 not connected to the second sub-housing 12 can be coplanar with the inner wall of the second sub-housing 12 to reduce the occupation of the internal space of the housing 10 .

[0104] In this solution, the opening of the first opening end 110 is larger than the opening of the second opening end 120, so that the second sub-shell 12 can be inserted into the opening of the first sub-shell 11; and a step 111 is formed on the inner wall of the first sub-shell 11, so that the second opening end 120 can abut against the step 111, thereby limiting the second sub-shell 12 and ensuring the assembly accuracy of the first sub-shell 11 and the second sub-shell 12.

[0105] According to some embodiments of the present application, Figure 4 and Figure 5 As shown, a sealing tape 16 is provided on the outer surface of the housing 10 , and the sealing tape 16 covers the gap between the first sub-housing 11 and the second sub-housing 12 .

[0106] The sealing tape 16 wraps the outer surface of the housing 10, and the sealing tape 16 surrounds at least one circle of the opening of the first sub-housing 11. One end of the sealing tape 16 is connected to the outer surface of the first sub-housing 11, and the other end of the sealing tape 16 is connected to the outer surface of the second sub-housing 12. The sealing tape 16 covers the gap between the first sub-housing 11 and the second sub-housing 12 to achieve a sealed connection between the first sub-housing 11 and the second sub-housing 12.

[0107] See also Figure 6 , Figure 6 An exploded view of a battery pack (with a box) provided in the first embodiment of the present application. According to some embodiments of the present application, the battery pack 100 further includes a box 70 , and the housing 10 is accommodated in the box 70 .

[0108] The box 70 may include a first sub-box 71 and a second sub-box 72, which are engaged with each other to form a third accommodating cavity, in which the housing 10 is accommodated. The first sub-box 71 and the second sub-box 72 are detachably connected to facilitate replacement of the box 70.

[0109] In the above solution, the box body 70 and the shell 10 form a two-layer protection structure, which further protects the battery cell group 20 and the circuit board 30 and prolongs the service life of the battery pack 100.

[0110] According to some embodiments of the present application, the box body 70 is provided with an aviation plug 73, and one end of the wiring harness 60 away from the circuit board 30 is connected to the aviation plug 73 to facilitate electrical connection between the battery pack 100 and electrical components.

[0111] Second embodiment

[0112] Compared with the first embodiment, the second embodiment does not include a box body, and the aviation plug 73 is arranged on the shell 10; the structural parts of the second embodiment also include side walls, and other features not mentioned please refer to the first embodiment.

[0113] See also Figure 7 and Figure 8 , Figure 7 A schematic diagram of the structure of the battery pack provided in the second embodiment of the present application. Figure 8 A cross-sectional view of a partial structure of a battery pack provided in the second embodiment of the present application. According to some embodiments of the present application, the structural member 40 further includes a side wall 45, which extends from an edge of the bottom wall 41 toward the circuit board 30 along the thickness direction X of the bottom wall 41, and at least a portion of the side wall 45 is arranged around the annular protrusion 42.

[0114] The side wall 45 extends from the edge of the bottom wall 41 toward the circuit board 30 along the thickness direction X of the bottom wall 41, and the side wall 45 at least partially surrounds the annular protrusion 42, so that a holding space is formed between the side wall 45, the bottom wall 41 and the annular protrusion 42. When the sealant is poured into the shell 10, since a large amount of sealant is poured into the shell 10, the sealant submerges the structural member 40, and the side wall 45 is arranged around the circuit board 30. The side wall 45 can constrain the sealant between the side wall 45 and the annular protrusion 42, so that after the sealant solidifies, it forms a support between the circuit board 30 and the structural member 40, thereby enhancing the strength of the circuit board 30.

[0115] According to some embodiments of the present application, Figure 7 As shown, the side wall 45 is provided with a first opening 451 .

[0116] The first opening 451 is an opening for injecting sealant. The sealant can enter the accommodation space formed by the side wall 45 , the bottom wall 41 and the annular protrusion 42 through the first opening 451 .

[0117] The provision of the first opening 451 facilitates the sealant to enter the interior of the structural member 40 through the first opening 451 , thereby facilitating the injection of the sealant.

[0118] like Figure 7 As shown, the first opening 451 may be a notch formed on the side wall 45 , and the notch may penetrate the side wall 45 in a direction perpendicular to the side wall 45 , and has a simple structure and is easy to process.

[0119] In this solution, when the sealant is poured into the housing 10 , the pouring direction of the sealant can be along a direction perpendicular to the side wall 45 , so that the sealant can quickly enter the interior of the structural member 40 from the first opening 451 .

[0120] See also Figure 7 , and see further Fig. 9 , Fig. 9 The exploded view of the battery pack provided in the second embodiment of the present application. According to some embodiments of the present application, the battery pack 100 further includes a wire harness 60 , which is connected to the circuit board 30 , and the wire harness 60 passes through the structural member 40 from the first opening 451 .

[0121] The wiring harness 60 is a conductor used to realize signal transmission. One end of the wiring harness 60 is electrically connected to the circuit board 30 , and the other end of the wiring harness 60 is used to connect to an external control system to realize electrical connection between the circuit board 30 and the external control system.

[0122] The first opening 451 is used as a wire harness through-hole, and the structure is reasonably utilized to avoid the need to open an additional wire harness through-hole and to seal the wire harness through-hole, thereby saving steps.

[0123] Since the side wall 45 extends from the edge of the bottom wall 41 toward the circuit board 30 along the thickness direction X of the bottom wall 41, the side wall 45 surrounds the circuit board 30. Figure 7 As shown, the first opening 451 penetrates the side wall 45 along the thickness direction of the side wall 45 , and the wire harness 60 passes through the side wall 45 along the thickness direction of the side wall 45 . This solution can reduce the routing length of the wire harness 60 .

[0124] See also Fig. 9 , and see further Fig.10 and Fig.11 , Fig.10 A cross-sectional view of a battery pack provided in the second embodiment of the present application, Fig.11 for Fig.10 According to some embodiments of the present application, the housing 10 is provided with a second opening 13 , and the second opening 13 is arranged opposite to the first opening 451 .

[0125] The second opening 13 is an opening provided in the housing 10, and the second opening 13 communicates the interior and exterior of the housing 10, so that the sealant can enter the interior of the housing 10 from the second opening 13. The second opening 13 is arranged opposite to the first opening 451, which reduces the flow path of the sealant, facilitates the injection of the sealant, and allows the sealant to flow smoothly toward the structure 40.

[0126] Alternatively, if Fig.10 As shown, the housing 10 includes a first accommodating chamber 101 and a second accommodating chamber 102. The battery cell group 20, the circuit board 30 and the structural member 40 are all located in the first accommodating chamber 101. The second accommodating chamber 102 is connected to the first accommodating chamber 101 through the third opening 14. The third opening 14 is arranged corresponding to the first opening 451 and the second opening 13. The wire harness 60 connected to the circuit board 30 passes through the first opening 451 and the third opening 14 and enters the second accommodating chamber 102, and passes out from the second accommodating chamber 102. The second accommodating chamber 102 and the first accommodating chamber 101 are two chambers inside the housing 10. The second accommodating chamber 102 can accommodate components such as the wire harness 60, so as to be separated from components such as the battery cell group 20, the circuit board 30 and the structural member 40 for easy management.

[0127] When the sealant is poured into the housing 10, the sealant enters the second accommodating cavity 102 from the second opening 13, then enters the first accommodating cavity 101 through the third opening 14, and then enters the interior of the structural member 40 from the first opening 451. In this solution, the sealant fills the first accommodating cavity 101.

[0128] In order to facilitate the sealant to flow toward the third opening 14, Fig.10 and Fig.11As shown, the second accommodating cavity 102 may be provided with a guide plate 15, which is used to guide the sealant entering the second accommodating cavity 102 through the second opening 13 to the third opening 14. The guide plate 15 plays a guiding role and can also prevent the sealant from splashing.

[0129] In this embodiment, the side wall 45 of the structural member 40 surrounds the circuit board 30 , and the distance between the inner surface of the side wall 45 and the circuit board 30 can be set to be relatively small, so that the components in the housing 10 are compact.

[0130] Third embodiment

[0131] Compared with the second embodiment, the extension height of the side wall 45 of the third embodiment is higher than that of the second embodiment, and the injection amount of the sealant in the shell of the third embodiment is smaller than that of the second embodiment.

[0132] See also Figure 12 to Figure 14 , Fig.12 A schematic diagram of the structure of the structural components of the battery pack provided in the third embodiment of the present application, Fig.13 A cross-sectional view of a portion of the structure of a battery pack provided in the third embodiment of the present application, Fig.14 for Fig.13 According to some embodiments of the present application, the circuit board 30 has a third surface 301 facing the battery cell group 20, along the thickness direction X of the bottom wall 41, the end of the side wall 45 away from the bottom wall 41 exceeds the third surface 301, and when viewed along the battery cell stacking direction Y, the projection of the side wall 45 overlaps with the projection of the battery cell 21; the structural member 40 is filled with sealant 80, and the sealant surface of the sealant 80 exceeds the third surface 301 and does not exceed the end of the side wall 45 away from the bottom wall 41.

[0133] The circuit board 30 also has a fourth surface 302 facing away from the battery cell group 20 . The third surface 301 and the fourth surface 302 are two opposite surfaces in the thickness direction of the circuit board 30 . The thickness direction of the circuit board 30 is parallel to the thickness direction X of the bottom wall 41 . The annular protrusion 42 is connected to the fourth surface 302 .

[0134] In this solution, when pouring the sealant 80, the first surface 411 of the bottom wall 41 is set upward, the bottom wall 41 is located below the circuit board 30, the battery pack 20 is located above the circuit board 30, and the space enclosed by the bottom wall 41 and the side wall 45 is used to accommodate the sealant 80. This solution can be called inverted pouring. The height direction of the sealant 80 is parallel to the thickness direction X of the bottom wall 41. The height of the sealant 80 refers to the distance between the surface of the sealant 80 and the first surface 411 along the thickness direction X of the bottom wall 41.

[0135] The side wall 45 and the bottom wall 41 define the position of the sealant 80 in the structural member 40, and the side wall 45 defines the height of the sealant 80. The sealant surface of the sealant 80 may be flush with the end of the side wall 45 away from the bottom wall 41, or the sealant surface of the sealant 80 may be lower than the end surface of the side wall 45 away from the bottom wall 41. The sealant surface of the sealant 80 exceeds the third surface 301, so as to achieve waterproof sealing of the electrical connection part of the circuit board 30 and improve the safety of the battery pack 100.

[0136] See also Fig.12 According to some embodiments of the present application, the bottom wall 41 includes a main body 414 and an extension portion 415 extending from the main body 414. When observed along the thickness direction of the structural member 40, the projection of the battery cell group 20 on the bottom wall 41 is located inside the main body 414, and the extension portion 415 protrudes from the end surface of the battery cell group 20. The side wall 45 includes a first portion 452 arranged at the edge of the main body 414 and a second portion 453 arranged at the edge of the extension portion 415. The end of the second portion 453 away from the bottom wall 41 forms a first opening 451.

[0137] The extension portion 415 is a portion of the bottom wall 41 extending from the edge of the main body 414. When observed along the thickness direction of the structural member 40, the projection of the battery cell group 20 on the bottom wall 41 is located inside the main body 414. The extension portion 415 protrudes from the end face of the battery cell group 20. The second portion 453 defines a first opening 451 to constrain the sealant. The extension portion 415 and the second portion 453 of the side wall 45 form a flow channel to facilitate the sealant injected from the first opening 451 to flow into the space enclosed by the first portion 452 and the main body 414, thereby improving the flow smoothness of the sealant.

[0138] When the battery pack 100 has only one layer of protective structure of the shell 10 , the shell 10 has a certain strength.

[0139] According to some embodiments of the present application, the present application further provides an electric device, which includes the battery pack 100 described in any of the above schemes, and the battery pack 100 is used to provide electrical energy to the electric device.

[0140] The power-consuming device may be any of the aforementioned devices or systems using the battery pack 100 .

[0141] According to some embodiments of the present application, the present application further provides a method for preparing a battery pack 100, and the method for preparing the battery pack 100 includes:

[0142] S410, provide a battery module and a shell 10, the battery module includes a battery cell group 20, a circuit board 30 and a structural member 40, the battery cell group 20 includes a plurality of battery cells 21 stacked, the circuit board 30 is located on one side of the battery cell group 20 and is electrically connected to the battery cell group 20, the side of the circuit board 30 away from the battery cell group 20 is provided with components 31, the structural member 40 is arranged on the surface of the circuit board 30 away from the battery cell group 20, the structural member 40 includes a bottom wall 41, an annular protrusion 42 and a side wall 45, the bottom wall 41 has a first surface 411 facing the circuit board 30 and a second surface 412 away from the circuit board 30, the annular protrusion 42 protrudes from the first surface 411, and the annular protrusion 42 is sealed and connected to the circuit board 30 so that the annular protrusion 42, the bottom wall 41 and the circuit board 30 enclose a closed space 401, the components 31 are arranged in the closed space 401, and the side wall 45 is provided with a plurality of battery cells 21 stacked and arranged, The side wall 45 extends from the edge of the bottom wall 41 to the circuit board 30 along the thickness direction X of the bottom wall 41. At least part of the side wall 45 is arranged around the annular protrusion 42. The side wall 45 extends beyond the side of the circuit board 30 facing the battery cell group 20 along the thickness direction X of the bottom wall 41. When viewed along the stacking direction of the battery cells 21, the projection of the side wall 45 overlaps with the projection of the battery cells 21. The bottom wall 41 includes a body 414 and an extension 415 extending from the body 414. When viewed along the thickness direction of the structural member 40, the projection of the battery cell group 20 on the bottom wall 41 is located inside the body 414. The extension 415 protrudes from the end surface of the battery cell group 20. The side wall 45 includes a first part 452 arranged at the edge of the body 414 and a second part 453 arranged at the edge of the extension 415. The end of the second part 453 away from the bottom wall 41 forms a first opening 451.

[0143] S420, adjusting the posture of the battery module so that the battery cell group 20 is located above the circuit board 30;

[0144] S430, injecting the sealant 80 into the structural member 40 through the first opening 451, so that the liquid level of the sealant 80 is higher than the side of the circuit board 30 facing the battery cell group 20;

[0145] S440 , after the sealant 80 solidifies, the battery module is assembled into the housing 10 .

[0146] According to the preparation method of the battery pack 100 of the embodiment of the present application, the battery pack 100 prepared by the preparation method, the sealant realizes the sealing and waterproof protection of the electrical connection components inside the battery pack 100, the annular protrusion 42 of the structural member 40 is connected to the circuit board 30, and the components 31 are isolated from the sealant, ensuring the normal use of the components 31, so that the battery pack 100 has a longer service life. This method adopts the method of pouring the glue by inverting the battery cell group 20, which can reduce the amount of sealant 80 and save costs.

[0147] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pack, characterized in that: include: case; A battery cell group is arranged in the housing, and the battery cell group includes a plurality of battery cells that are stacked; A circuit board is located at one side of the battery cell group and is electrically connected to the battery cell group, and components are arranged on a surface of the circuit board away from the battery cell group; A structural member, disposed on a surface of the circuit board facing away from the battery cell group, the structural member is connected to the circuit board to form a closed space, and the components are located in the closed space; The structural member comprises a bottom wall and an annular protrusion, wherein the bottom wall has a first surface facing the circuit board and a second surface away from the circuit board, the annular protrusion protrudes from the first surface, the annular protrusion is connected to the circuit board, and the first surface of the bottom wall, the annular protrusion and the circuit board enclose the enclosed space; The first surface includes a central area located inside the annular protrusion and an edge area located outside the annular protrusion, and a space between the edge area and the circuit board is filled with sealant.

2. The battery pack according to claim 1, characterized in that: A sealing member is arranged between the annular protrusion and the circuit board.

3. The battery pack according to claim 1, characterized in that: The second surface is formed with an annular groove corresponding to the position of the annular protrusion.

4. The battery pack according to claim 3, characterized in that: The second surface is formed with a first groove communicating with the annular groove, and the first groove extends from the edge of the bottom wall to the annular groove.

5. The battery pack according to claim 3, characterized in that: The bottom wall is provided with a reinforcing rib, and the annular groove surrounds the reinforcing rib.

6. The battery pack according to claim 1, characterized in that: The structural member further includes a side wall, which extends from an edge of the bottom wall toward the circuit board along a thickness direction of the bottom wall, and at least a portion of the side wall is disposed around the annular protrusion.

7. The battery pack according to claim 6, characterized in that: The side wall is provided with a first opening.

8. The battery pack according to claim 7, characterized in that: The housing is provided with a second opening, and the second opening is arranged opposite to the first opening.

9. The battery pack according to claim 7, characterized in that: The circuit board has a third surface facing the battery cell group, along the thickness direction of the bottom wall, one end of the side wall away from the bottom wall exceeds the third surface, and when viewed along the direction of the battery cell stacking, the projection of the side wall overlaps with the projection of the battery cell; The structural member is filled with sealant, and the sealant surface exceeds the third surface and does not exceed the end of the side wall away from the bottom wall.

10. The battery pack according to claim 7, characterized in that: The bottom wall includes a main body and an extension portion extending from the main body. When observed along the thickness direction of the structural member, the projection of the battery cell group on the bottom wall is located within the main body. The extension portion protrudes from the end surface of the battery cell group. The side wall includes a first portion arranged at the edge of the main body and a second portion arranged at the edge of the extension portion. An end of the second portion away from the bottom wall forms the first opening.

11. The battery pack according to claim 8, characterized in that: The shell includes a first accommodating cavity and a second accommodating cavity. The battery cell group, the circuit board and the structural component are all located in the first accommodating cavity. The second accommodating cavity is connected to the first accommodating cavity through a third opening. The third opening is arranged corresponding to the first opening and the second opening.

12. The battery pack according to claim 11, characterized in that: A guide plate is disposed in the second accommodating cavity, and the guide plate is used to guide the sealant entering the second accommodating cavity through the second opening to the third opening.

13. The battery pack according to claim 1, characterized in that: The battery pack further includes a box body, and the shell is accommodated in the box body.

14. An electrical device, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 13.

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