CN114976507A

CN114976507A - Battery pack and electric equipment

Info

Publication number: CN114976507A
Application number: CN202210760002.5A
Authority: CN
Inventors: 胡联亚; 刘小锋; 李长江
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Dongguan Poweramp Technology Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-08-30
Also published as: WO2024001682A1

Abstract

The application relates to a battery pack and electric equipment, and belongs to the technical field of battery packs. The battery pack includes: a housing; the battery cell group is arranged in the shell and comprises a plurality of battery cells which are arranged in a stacked mode; the circuit board is positioned on one side of the electric core group and is electrically connected with the electric core group, and a component is arranged on the surface of the circuit board, which is far away from the electric core group; the structure, set up in the circuit board deviates from on the face of electric core group, the structure with the circuit board is connected in order to form airtight space, components and parts are located in the airtight space. The battery pack has a long service life.

Description

Battery pack and electric equipment

Technical Field

The application relates to the technical field of battery packs, in particular to a battery pack and electric equipment.

Background

The capacity of a single battery cell sometimes cannot meet the requirement of a user, and at the moment, a plurality of battery cells are required to be connected in series or in parallel to form a battery cell group. The BATTERY pack is composed of a case, a BATTERY pack, and a BMS (BATTERY management system MANAGEMENT SYSTEM).

In the development of battery technology, in addition to improving the energy density of a battery pack, how to prolong the service life of the battery pack is also an urgent technical problem to be solved.

Disclosure of Invention

The application aims to provide a battery pack and electric equipment. The battery pack has a long service life.

The application is realized by the following technical scheme:

in a first aspect, the present application provides a battery pack, comprising: a housing; the battery cell group is arranged in the shell and comprises a plurality of battery cells which are arranged in a stacked mode; the circuit board is positioned on one side of the electric core group and is electrically connected with the electric core group, and a component is arranged on the surface of the circuit board, which is far away from the electric core group; the structure, set up in the circuit board deviates from on the face of electric core group, the structure with the circuit board is connected in order to form airtight space, components and parts are located in the airtight space.

According to the battery package of this application embodiment, on the face that the circuit board deviates from the electric core group was located to the structure, structure and circuit board sealing connection formed airtight space, and components and parts are located airtight space, and this airtight space is not filled sealed glue and can't get into this airtight space to make components and parts and sealed glue keep apart, reduce sealed risk of gluing corruption components and parts, in order to prolong the life of battery package.

According to some embodiments of the application, the structure includes diapire and annular convex part, the diapire have towards the first face of circuit board with deviate from the second face of circuit board, annular convex part protrusion in first face, annular convex part with the circuit board is connected, the first face of diapire annular convex part and the circuit board encloses into airtight space.

In the above scheme, the annular convex part is connected with the circuit board in a sealing manner, so that the annular convex part, the bottom wall and the circuit board enclose a closed space, and the component is isolated from the sealant poured into the shell.

According to some embodiments of the present application, a seal is disposed between the annular protrusion and the circuit board.

In the scheme, the sealing element is arranged, so that the annular convex part and the circuit board are in sealing connection, and the sealing glue cannot enter the closed space.

According to some embodiments of the present application, the second face is formed with an annular groove corresponding in position to the annular protrusion.

In the scheme, the annular groove is formed, so that the weight of the structural part can be reduced, and the structural part can be formed in a stamping mode, so that the annular convex part is formed on one side of the structural part, and meanwhile, the annular groove is formed on the other side of the structural part.

According to some embodiments of the present application, the second face is formed with a first groove communicating with the annular groove, the first groove extending from an edge of the bottom wall to the annular groove.

In the above scheme, through setting up first recess for sealed glue of pouring in the casing can follow first recess and get into the annular groove in, sealed glue of being convenient for can flow into the annular groove fast, in order to improve sealed penetrating efficiency who glues.

According to some embodiments of the application, the bottom wall is provided with a reinforcement rib, and the annular groove surrounds the reinforcement rib.

In above-mentioned scheme, the strengthening rib has strengthened the structural strength of diapire to the annular groove surrounds the strengthening rib, makes the partial structural strength that the diapire was surrounded by the annular groove higher, reduces this part and warp and extrude the risk of components and parts, improves the safety in utilization of battery package.

According to some embodiments of the present application, the first surface includes a central region located inside the annular protrusion and a marginal region located outside the annular protrusion, and a space between the marginal region and the circuit board is filled with a sealant.

In the scheme, the sealant fills the space between the edge area and the circuit board to form support between the circuit board and the structural member, so that the strength of the circuit board is enhanced, the risk of the circuit board being damaged by extrusion is reduced, and the use safety of the circuit board is improved.

According to some embodiments of the application, the structural member further comprises a side wall extending from an edge of the bottom wall toward the circuit board in a thickness direction of the bottom wall, at least a portion of the side wall being disposed around the annular protrusion.

In the above scheme, because the sealed glue of pouring in the casing is more, sealed glue submerges the structure to the lateral wall sets up around the circuit board, the lateral wall can be retrained sealed glue between lateral wall and annular convex part, so that form the support between circuit board and structure after sealed glue solidifies, strengthen the intensity of circuit board.

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

In the above scheme, the setting of first opening to sealed glue is convenient for follow the inside of this first opening entering structure, is convenient for realize sealed pouring of gluing.

According to some embodiments of the present application, the housing is provided with a second opening disposed opposite the first opening.

In the above scheme, the second opening is arranged opposite to the first opening, so that the sealant can be poured conveniently, and the sealant can smoothly flow towards the interior of the structural member.

According to some embodiments of the application, the circuit board has a third surface facing the battery cell group, an end of the side wall facing away from the bottom wall extends beyond the third surface along the thickness direction of the bottom wall, and there is an overlap between the projection of the side wall and the projection of the battery cell as viewed along the stacking direction of the battery cells; the structural part is filled with sealant, and the sealant surface of the sealant exceeds the third surface and does not exceed one end of the side wall, which is far away from the bottom wall.

In the 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 glue surface of the sealant exceeds the third surface, so that the electric connection part of the circuit board is sealed and waterproof, and the use safety of the battery pack is improved.

According to some embodiments of the application, the bottom wall includes a body and an extension part extending from the body, and viewed in the thickness direction of the structural member, the projection of the electric core assembly on the bottom wall is located in the body, the extension part protrudes from the end face of the electric core assembly, the side wall includes a first part arranged at the edge of the body and a second part arranged at the edge of the extension part, and one end of the second part, which is far away from the bottom wall, encloses the first opening.

In the above scheme, the second part limits the first opening, realizes the restraint to the sealant flows to the space that first part and the body of lateral wall enclose.

According to some embodiments of this application, the casing includes that first chamber and the second of holding hold the chamber, the electric core group the circuit board with the structure all is located first intracavity that holds, the second hold the chamber with first chamber that holds passes through the third opening intercommunication, the third opening with first opening with the second opening corresponds the setting.

In above-mentioned scheme, the second holds the chamber and holds the chamber with first two cavities that hold for the casing is inside, and the second holds the chamber and can holds parts such as pencil to separate with parts such as electric core group, circuit board and structure, the management of being convenient for.

According to some embodiments of the application, the second holds the intracavity and is provided with the guide plate, the guide plate is used for will getting into via the second opening sealed glue water conservancy diversion in the second holds the intracavity extremely the third opening.

In the above scheme, the guide plate plays a role in guiding flow, and the sealant can be prevented from splashing.

According to some embodiments of the present application, the battery pack further includes a case, and the case is accommodated in the case.

In the above scheme, the box and the casing constitute two-layer protection architecture, further realize the protection to electric core group and circuit board, prolong the life of battery package.

In a second aspect, the present application provides an electric device including the battery pack provided in the above embodiment.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is an exploded view of a battery pack according to a first embodiment of the present application;

fig. 2 is a schematic view illustrating an assembly of a structural member and a circuit board according to a first embodiment of the present application;

fig. 3 is a sectional view of an assembled state of a structural member and a circuit board according to a first embodiment of the present application;

FIG. 4 is a cross-sectional view of a housing provided in accordance with a first embodiment of the present application;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

fig. 6 is an exploded view of a battery pack (with a case) according to a first embodiment of the present application;

fig. 7 is a schematic structural view of a structural member of a battery pack according to a second embodiment of the present application;

fig. 8 is a sectional view of a part of the structure of a battery pack provided in a second embodiment of the present application;

fig. 9 is an exploded view of a battery pack according to a second embodiment of the present application;

fig. 10 is a cross-sectional view of a battery pack provided in a second embodiment of the present application;

FIG. 11 is a partial enlarged view of FIG. 10 at B;

fig. 12 is a schematic structural view of a structural member of a battery pack according to a third embodiment of the present application;

fig. 13 is a sectional view of a part of the structure of a battery pack provided in a third embodiment of the present application;

fig. 14 is a partial enlarged view of fig. 13 at C.

Icon: 100-a battery pack; 10-a housing; 101-a first receiving chamber; 102-a second receiving chamber; 11-a first sub-housing; 110-a first open end; 111-step; 12-a second sub-housing; 120-a second open end; 13-a second opening; 14-a third opening; 15-a baffle; 16-sealing tape; 20-electric core group; 21-electric core; 30-a circuit board; 301-third face; 302-fourth face; 31-a component; 40-a structural member; 401-a closed space; 41-bottom wall; 411-first side; 4111-a central region; 4112-edge zone; 412-a second face; 413-reinforcing ribs; 414-ontology; 415-an extension; 42-an annular projection; 43-an annular groove; 44-a first groove; 45-side wall; 451-a first opening; 452 — a first portion; 453-second part; 50-a seal; 60-a wiring harness; 70-a box body; 71-a first sub-tank; 72-a second sub-tank; 73-aerial plug; 80-sealing glue.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two sets), "plural pieces" means two or more (including two pieces), unless otherwise specifically limited.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

The battery pack comprises a battery cell group and a BMS, wherein the battery cell group comprises a plurality of battery cells. The BMS is used for monitoring the state of the battery cells, intelligently managing and maintaining the battery cells, preventing the battery cells from being overcharged and overdischarged and prolonging the service life of the battery pack. The BMS includes a circuit board and components disposed on the circuit board, and the components are electrically connected to an external control system to implement management of the battery cells (e.g., detecting current, voltage, or temperature of the battery cells).

The service life of the battery pack has many influencing factors, wherein the influence of safety risks such as fire, thermal runaway and the like on the service life of the battery pack is prominent. In the prior art, the reasons for fire and thermal runaway of the battery pack include: 1. the short circuit of the water inlet of the electrical element causes the over-high temperature; 2. the electrical connection point is loosened and corroded, and the connection point is stressed to be fatigued and partially broken to cause local internal resistance to be increased and cause overhigh temperature; further, the battery thermal runaway and the explosion and fire of the battery pack are caused by the over-high temperature. Therefore, the connection reliability and the waterproof performance of the electric connection position are particularly important, one of the better methods for realizing the safety and the reliability of the sealing waterproof performance and the connection point position of the electric connection part in the battery pack is to fill the sealant in the electric connection position of the battery pack, prevent the electric connection position from being loosened by stress and from being damaged by fatigue, and isolate air and prevent corrosion.

The soft-package battery cell is taken as an example for introduction, and generally, sealant (for short, potting adhesive) is poured at the top sealing position of the soft-package battery cell to solve the problem of top sealing and punching of the soft-package battery cell; secondly, sealant is poured into the shell of the battery pack, and can well fix the BMS plate, the lug welding spot of the battery cell and collect the nickel sheet welding spot, so that the mutual movement failure of the electric connection welding spot is prevented; and thirdly, the glue pouring can isolate air and water, and prevent the corrosion of the electric connection point (the corrosion-resistant nickel plating layer of the copper lug is damaged by laser welding and the laser welding alloy layer is easy to corrode).

The inventor finds that although the sealant can realize the tightness of the electric connecting part in the battery pack and the stress looseness and fatigue damage of the electric connecting position, the sealant can corrode components on the circuit board of the BMS, and meanwhile, the sealant is solidified to easily transmit deformation stress to the components, so that the connection reliability of the components and the circuit board is poor, the components and the circuit board are separated from each other when the component is serious, the normal use of the battery pack is influenced, and the service life of the battery pack is shortened.

In view of this, in order to solve the problem that sealed glue corrodes components and parts on the circuit board and influence the life of battery package, the inventor has designed a battery package, through set up the structure in the one side that deviates from the electric core group of circuit board, structure and circuit board sealing connection are in order to form the airtight space that prevents sealed glue entering, keep apart components and parts on the circuit board with sealed glue, prevent sealed glue corrosion components and parts, and then prolong the life of components and parts to the life of extension battery package.

The battery pack disclosed by the embodiment of the application can be but is not limited to be used in electric equipment such as electric two-wheeled vehicles, electric tools, unmanned aerial vehicles and energy storage equipment. The battery that possesses this application operating mode can be used as the electrical power generating system of consumer, like this, is favorable to improving electrical power generating system's charge-discharge safety and consumer's power consumption safety.

The embodiment of the application provides an use consumer of battery package as power, consumer can be but not limited to electronic equipment, electric tool, unmanned aerial vehicle, energy storage equipment. The electronic equipment can comprise a mobile phone, a tablet, a notebook computer and the like, and the electric tool can comprise an electric drill, an electric saw and the like.

In an embodiment of the present application, the battery pack 100 may include a plurality of battery cells. In the battery pack 100, a plurality of battery cells may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the plurality of battery cells.

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

The battery pack 100 may further include a bus bar (not shown), through which an electrical connection between the plurality of battery cells is achieved, so as to achieve a series connection, a parallel connection, or a series-parallel connection of the plurality of battery cells. The bus member may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, or the like.

First embodiment

Referring to fig. 1 to 3, fig. 1 is an exploded view of a battery pack according to a first embodiment of the present disclosure, fig. 2 is an assembly diagram of a structural component and a circuit board according to the first embodiment of the present disclosure, and fig. 3 is a cross-sectional view of an assembly state of the structural component and the circuit board according to the first embodiment of the present disclosure. The embodiment of the present application provides a battery pack 100, wherein the battery pack 100 includes a housing 10, a battery pack 20, a circuit board 30 and a structural member 40. The battery pack 20 is disposed in the housing 10, and the battery pack 20 includes a plurality of battery cells 21 stacked in a stacked manner. The circuit board 30 is located one side of the electric core group 20, the circuit board 30 is electrically connected with the electric core group 20, and a component 31 is arranged on the surface of the circuit board 30 departing from the electric core group 20. The structural member 40 is disposed on a surface of the circuit board 30 away from the electric core assembly 20, the structural member 40 is hermetically connected to the circuit board 30 to form a sealed space 401, and the component 31 is located in the sealed space 401.

A plurality of electric cores 21 pile up the setting, can save space and occupy, improve space utilization.

The component 31 and the electric core group 20 are located on two sides of the circuit board 30 in the thickness direction, so that the space is reasonably utilized, and the component 31 and the electric core group 20 are prevented from interfering.

The structural member 40 is a member for being connected with the circuit board 30 in a sealing manner, a sealed space 401 is formed after the structural member 40 is connected with the circuit board 30, and the sealant poured into the casing 10 cannot enter the sealed space 401, so that the component 31 and the sealant in the sealed space 401 are isolated.

According to battery package 100 of the embodiment of this application, structure 40 sets up on the face that circuit board 30 deviates from electric core group 20, structure 40 sets up in the homonymy of circuit board 30 with components and parts 31, structure 40 and circuit board 30 sealing connection form airtight space 401, components and parts 31 are located airtight space 401, this airtight space 401 is not sealed to fill, and sealed glue can't get into this airtight space 401, thereby make components and parts 31 and sealed isolation of gluing, reduce sealed glue and components and parts 31 contact and corrode components and parts 31 and high low temperature stress and lead to the risk that components and parts 31 stress breaks away from, the life of extension components and parts 31, thereby make battery package 100 have longer life.

Referring to fig. 2 and 3, according to some embodiments of the present disclosure, 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 facing away from the circuit board 30, the annular protrusion 42 protrudes from the first surface 411, the annular protrusion 42 is hermetically 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 sealed space 401.

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

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

The sealed space 401 is a space surrounded by the annular protrusion 42, the bottom wall 41 and the circuit board 30, and because the annular protrusion 42 is hermetically connected with the circuit board 30, the sealed space 401 is independent of the external environment, and the sealant cannot enter the sealed space 401 through the connection between the annular protrusion 42 and the circuit board 30, so that the component 31 located in the sealed space 401 is isolated from the sealant poured into the housing 10.

According to some embodiments of the present application, a seal 50 is disposed between the annular protrusion 42 and the circuit board 30, as shown in fig. 3.

The sealing member 50 is a member for achieving the sealing connection between the annular protrusion 42 and the circuit board 30, and the sealing member 50 may be a sealing foam, a gasket, a sealing tape, or the like.

The sealing member 50 is disposed to form a sealing connection between the annular protrusion 42 and the circuit board 30, so that the sealing agent cannot enter the sealed space 401.

According to some embodiments of the present application, as shown in fig. 2 and 3, the second face 412 is formed with an annular groove 43 corresponding in position to the annular protrusion 42.

The annular groove 43 is a groove formed in the second face 412, and a projection of the annular protrusion 42 on the bottom wall 41 overlaps the annular groove 43 in the thickness direction X of the bottom wall 41. The provision of the annular groove 43 reduces the weight of the structural member 40. The structural member 40 may be stamped and formed such that an annular protrusion 42 is formed on one side of the structural member 40 while an annular recess 43 is formed on the other side.

According to some embodiments of the present application, as shown in fig. 2, the second face 412 is formed with a first groove 44 communicating with the annular groove 43, the first groove 44 extending from the edge of the bottom wall 41 to the annular groove 43.

First groove 44 may be a glue-guiding groove, first groove 44 extending from the edge of bottom wall 41 to annular groove 43 such that annular groove 43 is in communication with the external environment. When pouring the sealing compound into the housing 10, the sealing compound can enter the annular groove 43 via the first groove 44.

The number of the first grooves 44 may be plural, and the plural first grooves 44 are provided at intervals along the extending direction of the annular groove 43 so as to communicate with the annular groove 43 at plural positions.

When the distance between the second surface 412 and the inner wall of the casing 10 is small, by arranging the first groove 44, the sealant poured into the casing 10 can enter the annular groove 43 from the first groove 44, so that the sealant can flow into the annular groove 43 quickly, and the permeation efficiency of the sealant is improved.

According to some embodiments of the present application, as shown in FIG. 2, the bottom wall 41 is provided with a rib 413 and the annular groove 43 surrounds the rib 413.

The reinforcing ribs 413 are formed on the bottom wall 41 to reinforce the structural strength of the bottom wall 41. The rib 413 may be formed by press-molding the bottom wall 41, and the rib 413 may be welded to the bottom wall 41.

The reinforcing ribs 413 enhance the structural strength of the bottom wall 41, and the annular groove 43 surrounds the reinforcing ribs 413, so that the structural strength of the part of the bottom wall 41 surrounded by the annular groove 43 is higher, the risk that the part is deformed to press the component 31 is reduced, and the use safety of the battery pack 100 is improved.

Referring to fig. 3, according to some embodiments of the present disclosure, the first face 411 includes a central region 4111 located inside the annular protrusion 42 and an edge region 4112 located outside the annular protrusion 42, and a space between the edge region 4112 and the circuit board 30 is filled with the sealant 80.

The sealant 80 is an adhesive used to fill the gaps in the formation to provide a seal. Meanwhile, the waterproof and heat-insulating rubber has the functions of leakage prevention, water prevention, vibration prevention, heat insulation and the like. The sealant 80 may include at least one of a polyurethane sealant, a neoprene sealant, an epoxy sealant, a butyl sealant, a PVC (Polyvinyl chloride) sealant. It is understood that the sealant 80 can be other adhesives having the above functions, and the material of the sealant is not specifically limited herein.

The central area 4111 and the edge area 4112 are two areas of the first face 411 separated by the annular protrusion 42, the area inside the profile of the annular protrusion 42 is the central area 4111, and the area outside the profile of the annular protrusion 42 is the edge area 4112, i.e., the annular protrusion 42 is not disposed at the edge of the first face 411. In other embodiments, the annular protrusion 42 may be disposed at an edge of the first face 411.

The sealant 80 fills the space between the edge region 4112 and the circuit board 30 to form a support between the circuit board 30 and the structural member 40, so as to enhance the strength of the circuit board 30, reduce the risk of the circuit board 30 being damaged by being pressed, and improve the safety of the circuit board 30.

Referring to fig. 1 and further to fig. 4, fig. 4 is a cross-sectional view of a housing according to a 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 hermetically connected to form a first accommodating cavity 101, and the electric core assembly 20, the circuit board 30 and the structural member 40 are located in the first accommodating cavity 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 connected in a sealing manner to form a first accommodating cavity 101, and the first accommodating cavity 101 is a filling space for sealant. The sealant fills the first receiving chamber 101, but the sealant does not enter the closed space 401.

The electric core group 20, the circuit board 30 and the structural member 40 are all located in the first accommodating cavity 101, and the casing 10 forms a protection structure, so that the electric core group 20, the circuit board 30 and the structural member 40 are protected.

According to some embodiments of the present application, the first sub-housing 11 and the second sub-housing 12 are made of plastic, which reduces the cost, and meanwhile, the wall thickness of the first sub-housing 11 and the second sub-housing 12 is thinner, which saves space and realizes light weight.

The housing 10 is provided with a second opening 13, and the second opening 13 may be provided in the first sub-housing 11, the second sub-housing 12, or both the first sub-housing 11 and the second sub-housing 12. Optionally, the second opening 13 is disposed in the first sub-housing 11 or the second sub-housing 12. Because the first sub-housing 11 and the second sub-housing 12 are plastic-absorbing parts, the second opening 13 is disposed in the first sub-housing 11 or the second sub-housing 12, so as to prevent the second opening 13 from being disposed in the open end of the first sub-housing 11 and the open end of the second sub-housing 12, and ensure the overall strength of the housing 10. For example, as shown in fig. 1, the second opening 13 is provided in the first sub-housing 11.

Referring to fig. 1 and 4, and further to fig. 5, fig. 5 is a partial enlarged view of a portion a of fig. 4. According to some embodiments of the present disclosure, the first sub-housing 11 includes a first opening end 110, the second sub-housing 12 includes a second opening end 120, the first opening end 110 is sleeved on the second opening end 120, a step 111 is disposed on an inner wall of the first sub-housing 11, and the second opening end 120 abuts against the step 111.

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

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 may be coplanar with the inner wall of the second sub-housing 12, so as to reduce the occupation of the inner space of the housing 10.

In this embodiment, the opening of the first open end 110 is larger than the opening of the second open end 120, so that the second sub-housing 12 can be inserted into the opening of the first sub-housing 11; and a step 111 is formed on the inner wall of the first sub-housing 11, so that the second opening end 120 is abutted to the step 111, the limitation on the second sub-housing 12 is realized, and the assembly precision of the first sub-housing 11 and the second sub-housing 12 is ensured.

According to some embodiments of the present application, as shown in fig. 4 and 5, the outer surface of the case 10 is provided with a sealing tape 16, and the sealing tape 16 covers the gap between the first sub-case 11 and the second sub-case 12.

The sealing tape 16 wraps the outer surface of the housing 10, and the sealing tape 16 surrounds at least one circumference of the opening of the first sub-housing 11. One end of the sealing tape 16 is attached to the outer surface of the first sub-housing 11, the other end of the sealing tape 16 is attached to the outer surface of the second sub-housing 12, and the sealing tape 16 covers the gap between the first sub-housing 11 and the second sub-housing 12 to achieve the sealing connection between the first sub-housing 11 and the second sub-housing 12.

Referring to fig. 6, fig. 6 is an exploded view of a battery pack (with a case) according to a first embodiment of the present application. According to some embodiments of the present application, the battery pack 100 further includes a case 70, and the case 10 is accommodated in the case 70.

The case 70 may include a first sub case 71 and a second sub case 72, the first sub case 71 and the second sub case 72 are fastened to each other to form a third receiving cavity, and the housing 10 is received in the third receiving cavity. The first sub-tank 71 is detachably coupled to the second sub-tank 72 to facilitate replacement of the tank 70.

In the above scheme, the box body 70 and the casing 10 form a two-layer protection structure, so as to further protect the electric core assembly 20 and the circuit board 30, and prolong the service life of the battery pack 100.

According to some embodiments of the present application, the case 70 is provided with an aerial insertion 73, and an end of the wiring harness 60 remote from the circuit board 30 is connected to the aerial insertion 73 so as to electrically connect the battery pack 100 with the power consuming components.

Second embodiment

Compared with the first embodiment, the second embodiment does not include a box body, and the aerial plug 73 is arranged on the housing 10; the structural member of the second embodiment also includes a side wall, and other features not mentioned are referred to in the first embodiment.

Referring to fig. 7 and 8, fig. 7 is a schematic structural view of a structural member of a battery pack according to a second embodiment of the present disclosure, and fig. 8 is a sectional view of a partial structure of the battery pack according to the second embodiment of the present disclosure. According to some embodiments of the present application, the structural member 40 further includes a side wall 45, the side wall 45 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 disposed around the annular protrusion 42.

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, and the side wall 45 at least partially surrounds the annular convex portion 42, so that a containing space is formed between the side wall 45, the bottom wall 41 and the annular convex portion 42, when the sealant is poured into the casing 10, the sealant submerges the structural member 40 due to more sealant poured into the casing 10, and the side wall 45 is arranged around the circuit board 30, the side wall 45 can restrain the sealant between the side wall 45 and the annular convex portion 42, so that after the sealant is solidified, a support is formed between the circuit board 30 and the structural member 40, and the strength of the circuit board 30 is enhanced.

According to some embodiments of the present application, as shown in fig. 7, the side wall 45 is provided with a first opening 451.

The first opening 451 is an opening for pouring sealant, and the sealant can enter the accommodating space formed by the side wall 45, the bottom wall 41 and the annular protrusion 42 through the first opening 451.

The first opening 451 is configured to facilitate the sealant to enter the structure 40 through the first opening 451, thereby facilitating the pouring of the sealant.

As shown in fig. 7, the first opening 451 may be a notch formed on the sidewall 45, and the notch may penetrate through the sidewall 45 in a direction perpendicular to the sidewall 45, so that the structure is simple and the processing is convenient.

In this embodiment, when pouring the sealant into the housing 10, the pouring direction of the sealant can be perpendicular to the side wall 45, so that the sealant can rapidly enter the interior of the structural member 40 from the first opening 451.

Referring to fig. 7 and further to fig. 9, fig. 9 is an exploded view of a battery pack according to a second embodiment of the present application. According to some embodiments of the present application, the battery pack 100 further includes a wiring harness 60, the wiring harness 60 being connected to the circuit board 30, the wiring harness 60 passing out of the structural member 40 from the first opening 451.

The wire harness 60 is a wire for realizing signal transmission, one end of the wire harness 60 is electrically connected with the circuit board 30, and the other end of the wire harness 60 is used for being connected with an external control system, so as to realize the electrical connection of the circuit board 30 and the external control system.

The first opening 451 is used as a wire harness penetrating port, so that the structure is reasonably utilized, the additional arrangement of the wire harness penetrating port and the additional sealing of the wire harness penetrating port are avoided, and the working procedures are saved.

Since 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, and the side wall 45 surrounds the circuit board 30, as shown in fig. 7, the first opening 451 penetrates through the side wall 45 along the thickness direction of the side wall 45, and the wiring harness 60 penetrates through the side wall 45 along the thickness direction of the side wall 45, which can reduce the routing length of the wiring harness 60.

Referring to fig. 9, and further to fig. 10 and 11, fig. 10 is a cross-sectional view of a battery pack provided in a second embodiment of the present application, and fig. 11 is a partial enlarged view of a portion B of fig. 10. According to some embodiments of the present application, the housing 10 is provided with a second opening 13, the second opening 13 being disposed opposite to the first opening 451.

The second opening 13 is an opening provided in the housing 10, and the second opening 13 communicates the inside and the outside of the housing 10, so that the sealant can enter the inside of the housing 10 from the second opening 13. The second opening 13 is disposed opposite to the first opening 451, and reduces a flow path of the sealant so as to facilitate pouring of the sealant and to make the sealant smoothly flow toward the structural member 40.

Optionally, as shown in fig. 10, the housing 10 includes a first accommodating cavity 101 and a second accommodating cavity 102, the electric core assembly 20, the circuit board 30 and the structural member 40 are all located in the first accommodating cavity 101, the second accommodating cavity 102 is communicated with the first accommodating cavity 101 through a third opening 14, the third opening 14 is arranged corresponding to the first opening 451 and the second opening 13, and the wire harness 60 connected to the circuit board 30 passes through the first opening 451 and the third opening 14, enters the second accommodating cavity 102, and passes out of the second accommodating cavity 102. The second accommodating cavity 102 and the first accommodating cavity 101 are two chambers inside the housing 10, and the second accommodating cavity 102 can accommodate the components such as the wire harness 60, so as to be separated from the components such as the electric core group 20, the circuit board 30 and the structural member 40, and thus, the management is convenient.

When the glue is poured into the housing 10, the sealing glue enters the second accommodating cavity 102 from the second opening 13, then enters the first accommodating cavity 101 through the third opening 14, and enters the interior of the structural member 40 from the first opening 451. In this scheme, sealed glue is filled first chamber 101 that holds.

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

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 small, so that the components inside the housing 10 are compact.

Third embodiment

In contrast to the second embodiment, the sidewalls 45 of the third embodiment extend to a greater height than the sidewalls 45 of the second embodiment, and the potting amount of the sealant within the housing of the third embodiment is less than the potting amount of the sealant within the housing of the second embodiment.

Referring to fig. 12 to 14, fig. 12 is a schematic structural view of a structural member of a battery pack according to a third embodiment of the present disclosure, fig. 13 is a cross-sectional view of a portion of the structure of the battery pack according to the third embodiment of the present disclosure, and fig. 14 is a partially enlarged view of a portion C of fig. 13. According to some embodiments of the present application, the circuit board 30 has a third face 301 facing the cell group 20, and an end of the side wall 45 facing away from the bottom wall 41 extends beyond the third face 301 along the thickness direction X of the bottom wall 41, and a projection of the side wall 45 overlaps with a projection of the cell 21 as viewed along the cell stacking direction Y; the structural member 40 is filled with the sealant 80, and the adhesive surface of the sealant 80 exceeds the third surface 301 and does not exceed the end of the side wall 45 far away from the bottom wall 41.

The circuit board 30 further has a fourth surface 302 facing away from the electric core group 20, the third surface 301 and the fourth surface 302 are two opposite surfaces of the circuit board 30 in the thickness direction, the thickness direction of the circuit board 30 is parallel to the thickness direction X of the bottom wall 41, and the annular convex portion 42 is connected to the fourth surface 302.

In this scheme, when pouring sealed glue 80, with the first face 411 setting up of diapire 41, diapire 41 is located the below of circuit board 30, and electric core group 20 is located the top of circuit board 30, and sealed glue 80 is held in the space that diapire 41 and lateral wall 45 enclose, and this kind of scheme can be called inversion encapsulating. The height direction of the sealant 80 is parallel to the thickness direction X of the bottom wall 41, and the height of the sealant 80 is a distance between the surface of the sealant 80 and the first surface 411 along the thickness direction X of the bottom wall 41.

The side wall 45 and the bottom wall 41 define the position of the sealant 80 in the structural member 40, the side wall 45 defines the height of the sealant 80, the adhesive surface of the sealant 80 can be flush with the end of the side wall 45 away from the bottom wall 41, and the adhesive surface of the sealant 80 can also be lower than the end surface of the end of the side wall 45 away from the bottom wall 41. The adhesive surface of the sealant 80 is beyond the third surface 301, so that the electrical connection part of the circuit board 30 is sealed and waterproof, and the use safety of the battery pack 100 is improved.

Referring to fig. 12, according to some embodiments of the present invention, the bottom wall 41 includes a body 414 and an extension portion 415 extending from the body 414, a projection of the electric core assembly 20 on the bottom wall 41 is located in the body 414 as viewed in a thickness direction of the structural member 40, the extension portion 415 protrudes from an end surface of the electric core assembly 20, the side wall 45 includes a first portion 452 disposed on an edge of the body 414 and a second portion 453 disposed on an edge of the extension portion 415, and an end of the second portion 453 away from the bottom wall 41 encloses the first opening 451.

The extending portion 415 is a portion of the bottom wall 41 extending from an edge of the body 414, when viewed in a thickness direction of the structural member 40, a projection of the electric core assembly 20 on the bottom wall 41 is located in the body 414, the extending portion 415 protrudes out of an end surface of the electric core assembly 20, the second portion 453 defines a first opening 451 to realize restriction of the sealant, and the extending portion 415 and the second portion 453 of the side wall 45 form a flow channel, so that the sealant poured from the first opening 451 flows into a space surrounded by the first portion 452 and the body 414, and the flowing smoothness of the sealant is improved.

When the battery pack 100 has only one layer of the protection structure of the case 10, the case 10 has certain strength.

According to some embodiments of the present application, there is also provided an electric device, which includes the battery pack 100 according to any of the above aspects, wherein the battery pack 100 is configured to provide electric energy for the electric device.

The powered device may be any of the aforementioned devices or systems that employ the battery pack 100.

According to some embodiments of the present application, there is also provided a method of manufacturing a battery pack 100, the method of manufacturing the battery pack 100 including:

s410, a battery module and a shell 10 are provided, the battery module comprises a cell group 20, a circuit board 30 and a structural part 40, the cell group 20 comprises a plurality of cells 21 which are stacked, the circuit board 30 is positioned on one side of the cell group 20 and is electrically connected with the cell group 20, a component 31 is arranged on one side of the circuit board 30, which is far away from the cell group 20, the structural part 40 is arranged on the surface of the circuit board 30, which is far away from the cell group 20, the structural part 40 comprises a bottom wall 41, an annular convex part 42 and a side wall 45, the bottom wall 41 is provided with a first surface 411 facing the circuit board 30 and a second surface 412 far away from the circuit board 30, the annular convex part 42 protrudes out of the first surface 411, the annular convex part 42 is hermetically connected with the circuit board 30, so that an airtight space 401 is defined by the annular convex part 42, the bottom wall 41 and the circuit board 30, the component 31 is arranged in the airtight space 401, 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 convex part 42, the side wall 45 extends beyond one surface of the circuit board 30 facing the electric core group 20 in the thickness direction X of the bottom wall 41, when viewed in the stacking direction of the electric cores 21, the projection of the side wall 45 overlaps with the projection of the electric cores 21, the bottom wall 41 comprises a body 414 and an extension part 415 extending from the body 414, when viewed in the thickness direction of the structural member 40, the projection of the electric core group 20 on the bottom wall 41 is located in the body 414, the extension part 415 protrudes from the end surface of the electric core group 20, the side wall 45 comprises a first part 452 arranged at the edge of the body 414 and a second part 453 arranged at the edge of the extension part 415, and one end of the second part 453 far from the bottom wall 41 encloses the first opening 451;

s420, adjusting the posture of the battery module to enable the electric core group 20 to be positioned above the circuit board 30;

s430, injecting the sealant 80 into the structural component 40 through the first opening 451, so that the liquid level of the sealant 80 is higher than the surface of the circuit board 30 facing the electric core assembly 20;

and S440, after the sealant 80 is solidified, the battery module is installed in the shell 10.

According to the preparation method of the battery pack 100, the battery pack 100 prepared by the preparation method has the advantages that the sealing glue realizes the sealing and waterproof protection of the electric connection components inside the battery pack 100, the annular convex part 42 of the structural member 40 is connected with the circuit board 30, the components 31 are isolated from the sealing glue, the normal use of the components 31 is ensured, and the battery pack 100 has longer service life. The method adopts the mode of inverting the electric core group 20 for glue pouring, can reduce the dosage of the sealant 80 and save the cost.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A battery pack, comprising:

a housing;

the battery cell group is arranged in the shell and comprises a plurality of battery cells which are arranged in a stacked mode;

the circuit board is positioned on one side of the electric core group and is electrically connected with the electric core group, and a component is arranged on the surface of the circuit board, which is far away from the electric core group;

the structure, set up in the circuit board deviates from on the face of electric core group, the structure with the circuit board is connected in order to form airtight space, components and parts are located in the airtight space.

2. The battery pack according to claim 1, wherein the structural member includes a bottom wall having a first surface facing the circuit board and a second surface facing away from the circuit board, and an annular protrusion protruding from the first surface, the annular protrusion being connected to the circuit board, the first surface of the bottom wall, the annular protrusion, and the circuit board enclosing the sealed space.

3. The battery pack according to claim 2, wherein a seal is provided between the annular protrusion and the circuit board.

4. The battery pack according to claim 2, wherein the second face is formed with an annular groove corresponding in position to the annular projection.

5. The battery pack according to claim 4, wherein the second face is formed with a first groove that communicates with the annular groove, the first groove extending from an edge of the bottom wall to the annular groove.

6. The battery pack of claim 4, wherein the bottom wall is provided with a bead, and the annular groove surrounds the bead.

7. The battery pack of claim 2, wherein the first face includes a central region located within the annular protrusion and a peripheral region located outside the annular protrusion, and a space between the peripheral region and the circuit board is filled with a sealant.

8. The battery pack of claim 2, wherein the structural member further comprises a side wall extending from an edge of the bottom wall toward the circuit board in a thickness direction of the bottom wall, at least a portion of the side wall being disposed around the annular protrusion.

9. The battery pack of claim 8, wherein the side wall is provided with a first opening.

10. The battery pack of claim 9, wherein the housing is provided with a second opening disposed opposite the first opening.

11. The battery pack of claim 9, wherein the circuit board has a third surface facing the battery cell group, and an end of the side wall facing away from the bottom wall extends beyond the third surface along the thickness direction of the bottom wall, and a projection of the side wall overlaps with a projection of the battery cells as viewed in the stacking direction of the battery cells;

the structural part is filled with sealant, and the sealant surface of the sealant exceeds the third surface and does not exceed one end of the side wall, which is far away from the bottom wall.

12. The battery pack according to claim 9, wherein the bottom wall includes a body and an extension portion extending from the body, a projection of the battery pack on the bottom wall is located in the body as viewed in a thickness direction of the structural member, the extension portion protrudes from an end surface of the battery pack, the side wall includes a first portion disposed on an edge of the body and a second portion disposed on an edge of the extension portion, and an end of the second portion away from the bottom wall defines the first opening.

13. The battery pack according to claim 10, wherein the housing includes a first receiving cavity and a second receiving cavity, the battery pack, the circuit board and the structure member are all located in the first receiving cavity, the second receiving cavity is communicated with the first receiving cavity through a third opening, and the third opening is disposed corresponding to the first opening and the second opening.

14. The battery pack of claim 13, wherein a flow guide plate is disposed in the second receiving cavity, and the flow guide plate is configured to guide the sealant entering the second receiving cavity through the second opening to the third opening.

15. The battery pack of claim 1, further comprising a case, the housing being received within the case.

16. An electrical device comprising a battery pack according to any one of claims 1 to 15.