CN113644350A - Battery pack and electric vehicle - Google Patents

Battery pack and electric vehicle Download PDF

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Publication number
CN113644350A
CN113644350A CN202010334713.7A CN202010334713A CN113644350A CN 113644350 A CN113644350 A CN 113644350A CN 202010334713 A CN202010334713 A CN 202010334713A CN 113644350 A CN113644350 A CN 113644350A
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CN
China
Prior art keywords
pole core
pole
core group
electrode
battery pack
Prior art date
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Pending
Application number
CN202010334713.7A
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Chinese (zh)
Inventor
孙华军
鲁志佩
彭青波
万龙
朱燕
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BYD Co Ltd
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BYD Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to CN202010334713.7A priority Critical patent/CN113644350A/en
Publication of CN113644350A publication Critical patent/CN113644350A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The application provides a battery pack and an electric vehicle, wherein the battery pack comprises a box body and at least one structural beam positioned in the box body, and the at least one structural beam divides the inner part of the box body into a plurality of accommodating cavities; a pole core string is arranged in the accommodating cavity and comprises a plurality of pole core groups connected in series; the pole core group is packaged in a packaging film; the pole core string in the containing cavity is electrically connected through a first conductive piece, the containing cavity is provided with a first opening, an insulating fixing piece is arranged at the first opening of the containing cavity, and the first conductive piece is fixed on the insulating fixing piece. This battery package is equipped with insulating mounting at the first opening part that holds the chamber to be used for the first electrically conductive piece of fixed support, can insulate simultaneously with it and other metalworks and keep apart, thereby can play better insulating fixed effect, be favorable to improving the security performance of battery package when using.

Description

Battery pack and electric vehicle
Technical Field
The invention relates to the field of batteries, in particular to a battery pack and an electric vehicle.
Background
With the continuous popularization of new energy automobiles, the use requirement of power batteries in the new energy automobiles becomes higher and higher. The traditional battery pack design adopts the battery module to be assembled on a battery pack box body to form a battery pack structure. The battery module is structurally composed of components such as an electric core, a high-voltage connecting sheet, a low-voltage sampling wire harness and a module structural member, the module is complex in design structure, low in assembly efficiency, multiple in types of parts, high in part cost and high in assembly cost. Moreover, the box outside the battery pack generally comprises a tray and an upper cover, the tray is formed by assembling and welding a plurality of boundary beams and a bottom plate, a plurality of reinforcing cross beams and longitudinal beam structures are designed in the tray, the battery module is fixed on the bottom plate of the tray, the structure of the battery box is complex, and the manufacturing cost is high. On traditional battery package installed electric automobile, the structure of battery package itself except that self satisfy mechanical safety performance's prerequisite alone under, still need the structural strength of the frame of whole car to protect the battery package structure. The cost of the whole vehicle is high, and the light-weight design requirement of the whole vehicle is limited to a certain extent.
In addition, crossbeam and longeron in the tray divide into a plurality of accommodation spaces with the tray inside, and the mode of electricity connection is more complicated between the battery module of setting in each accommodation space, can have the safe problem of inside short circuit electricity connection such as moreover.
Disclosure of Invention
The present disclosure is directed to solving at least one of the problems in the prior art. To this end, in a first aspect of the present application, there is provided a battery pack comprising a case and at least one structural beam located within the case, the at least one structural beam dividing an interior of the case into a plurality of receiving cavities; a pole core string is arranged in the accommodating cavity and comprises a plurality of pole core groups connected in series; the pole core group is packaged in a packaging film;
the pole core string in the containing cavity is electrically connected through a first conductive piece, the containing cavity is provided with a first opening, an insulating fixing piece is arranged at the first opening of the containing cavity, and the first conductive piece is fixed on the insulating fixing piece.
In a second aspect of the present application, there is provided an electric vehicle including the battery pack described above.
The invention has the beneficial effects that: according to the invention, a plurality of pole core groups are connected in series to form a pole core string, the pole core groups are packaged in the packaging film, and the pole core string is arranged in the box body of the battery pack, so that a good sealing effect can be achieved; and need not earlier in this application to assemble into battery case with assembling into battery cell in order to assemble into battery cell with utmost point core, assembles battery module with battery cell, end plate, curb plate etc. again, then assembles the battery module on the battery package box, the battery package simple structure of this application, and packaging efficiency is high, is favorable to reduction in production cost. Moreover, structural members such as end plates and side plates are omitted in the battery pack, so that the energy density of the battery pack is improved, and meanwhile, the light-weight design of the electric vehicle can be realized; in addition, be equipped with insulating mounting at the first opening part that holds the chamber to be used for the fixed first electrically conductive piece of support, can insulate simultaneously it with other metalworks and keep apart, thereby can play better insulating fixed effect, be favorable to improving the security performance of battery package when using.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a pole core assembled into a case according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a pole piece string according to an embodiment of the present invention.
Fig. 4a is a schematic structural view illustrating a connection between a pole core set and a fixed spacer according to an embodiment of the present invention.
Fig. 4b is an exploded perspective view of a pole core assembly and a fixed spacer according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of two pole core strings connected in series in the same accommodating cavity according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of two pole core strings connected in series in the same accommodating cavity according to another embodiment of the present invention.
Fig. 7 is a schematic structural diagram of two pole cores connected in series and in parallel in the same accommodating cavity according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of two pole core strings connected in series in two accommodating cavities according to an embodiment of the present invention.
Fig. 9 is a schematic structural diagram of two pole cores connected in series and in parallel in two accommodating cavities according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of two pole core strings connected in series in two accommodating cavities according to another embodiment of the present invention.
Fig. 11 is a schematic structural diagram of two pole cores connected in series and in parallel in two accommodating cavities according to another embodiment of the present invention.
Fig. 12 is a schematic structural diagram of an encapsulation film encapsulating a pole-core group according to an embodiment of the invention.
Fig. 13 is a schematic structural view of an encapsulation film encapsulating a pole-core group according to another embodiment of the invention.
Fig. 14 is an enlarged view of a portion M in fig. 2.
Fig. 15 is an exploded perspective view of a battery pack according to an embodiment of the invention.
Fig. 16 is an enlarged view of a portion N in fig. 15.
Fig. 17 is a partial exploded perspective view of an insulative retainer and protective cap according to an embodiment of the present invention.
Fig. 18 is a schematic partial structural view of a battery pack according to an embodiment of the present invention.
Fig. 19 is a schematic structural diagram illustrating a first conductive member fixed in an insulating fixing member according to an embodiment of the present invention.
Fig. 20 is a partially enlarged view of portion L in fig. 19.
Fig. 21 is a partial structural schematic view of an insulating fixing member according to an embodiment of the present invention.
Fig. 22 is a schematic view of a partial structure of a battery pack according to an embodiment of the present invention.
Fig. 23 is a partial enlarged view of a portion P in fig. 22.
Fig. 24 is an exploded perspective view of fig. 22.
Fig. 25 is a partial enlarged view of a portion Q in fig. 24.
Reference numerals
10. A battery pack;
100. a tank body; 110. an installation part; 111. mounting holes; 120. a top plate; 130. a base plate; 140. a first frame; 150. a second frame; 141. a reinforcing plate; 160. a third frame; 170. a fourth frame; 180. a second opening; 190. an air exhaust hole; 1010. injecting glue holes; 112. an end plate;
200. a structural beam; 210. a heat dissipation channel; 250. a recess; 260. an extension portion; 220. a first side plate; 230. a second side plate; 240. a partition plate;
300. an accommodating chamber;
400. a pole core group; 401. a pole piece string; 410. a first electrode lead-out member; 411. a first bent portion; 420. a second electrode lead-out member; 421. a second bent portion; 430. a pole core assembly body; 440. a second conductive member; 450. fixing a space ring; 451. a bolt; 452. a jack; 453. a first space ring; 454. a second space ring; 460. a first conductive member; 461. a first fixed part; 462. a second fixed part;
500. packaging the film; 510. a packaging section;
600. an insulating fixing member; 620. a clamping part; 621. a groove; 630. a connecting portion; 631. a hook; 640. connecting holes; 650. a connecting nail;
700. a protective cover; 710. flanging part; 711. a card slot;
Detailed Description
While the following is a description of the preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 3, a first embodiment of the present invention provides a battery pack 10 (as shown in fig. 2), the battery pack 10 includes a box body and at least one structural beam 200 located in the box body, the at least one structural beam 200 partitions the interior of the box body into a plurality of accommodating cavities 300; a pole core string 401 is arranged in the accommodating cavity 300, and the pole core string 401 comprises a plurality of pole core groups 400 connected in series; the pole core group 400 is encapsulated in an encapsulation film 500 (as shown in fig. 12 and 13); the pole core strings 401 in the accommodating cavities 300 are electrically connected through a first conductive member 460 (as shown in fig. 15 and 16), the accommodating cavities 300 have first openings, an insulating fixing member 600 is disposed at the first openings of the accommodating cavities 300, and the first conductive member 460 is fixed to the insulating fixing member 600.
In the invention, a plurality of pole core groups 400 are connected in series to form pole core strings 401, the pole core groups 400 are packaged in a packaging film 500, and the pole core strings 401 are arranged in a box body of the battery pack 10, so that a good sealing effect can be achieved; and need not earlier in this application pack into in the battery case with assembling into battery cell with utmost point core group 400, assemble into battery module with battery cell, end plate, curb plate etc. again, then assemble battery module to battery package 10 box on, battery package 10 simple structure of this application, the packaging efficiency is high, is favorable to reduction in production cost. Moreover, structural members such as end plates and side plates are omitted from the battery pack 10, so that the energy density of the battery pack 10 is improved, and the lightweight design of the electric vehicle can be realized; in addition, the insulating fixing member 600 is disposed at the first opening of the accommodating cavity 300 to fix and support the first conductive member 460, and simultaneously, the first conductive member can be insulated and isolated from other metal members, so that a better insulating and fixing effect can be achieved, and the safety performance of the battery pack 10 in use can be improved.
The pole core strings 401 in the multiple accommodating cavities 300 are electrically connected through the first conductive member 460, and any two pole core strings 401 in the accommodating cavities 300 may be electrically connected through the first conductive member 460, for example, the pole core strings 401 in two adjacent accommodating cavities 300 are connected in series or in parallel, or the pole core strings 401 in two spaced accommodating cavities 300 are connected in series or in parallel; three or more pole core strings 401 in the receiving cavity 300 may be connected in series or in parallel.
In one embodiment, the first conductive member 460 is a connecting piece, such as a copper bar or an aluminum bar. Of course, the first conductive member 460 may be other conductive members.
In addition, the number of the pole core strings 401 in each accommodating cavity 300 and the number of the pole core groups 400 included in each pole core string 401 can be designed according to different power requirements. Also, the number of pole core strings 401 in each receiving cavity 300 may be the same or different. When a plurality of pole core strings 401 are arranged in the accommodating cavity 300, the pole core strings 401 can be connected in series, in parallel or in series-parallel.
In the present application, pole piece group 400 includes at least one pole piece. When the pole core assembly 400 includes two or more pole cores, the pole cores are connected in parallel.
The pole core mentioned in the present application is a pole core commonly used in the field of power batteries, and the pole core group 400 belong to the constituent parts of the battery and cannot be understood as the battery itself; in addition, the pole core can be formed by winding or can be made in a lamination mode; generally, the pole core includes at least a positive pole piece, a separator, and a negative pole piece.
In some embodiments, the case of the battery pack 10 is provided with a mounting portion 110 (as shown in fig. 2), and the case of the battery pack 10 is detachably or non-detachably connected and fixed to an external load through the mounting portion 110 provided thereon. Generally, the case of the battery pack 10 needs to be connected and fixed with an external load, so that the battery pack has special requirements on impact resistance, extrusion resistance and the like, and cannot be simply equivalent to the case of a battery module or a single battery. Generally, the battery pack 10 further includes at least one of a Battery Management System (BMS), a battery connector, a battery sampler, and a battery thermal management system.
In one embodiment, as shown in fig. 2, the box body comprises a box body 100, the box body 100 comprises a top plate 120 and a bottom plate 130 which are oppositely arranged along a second direction, the second direction is the height direction of the box body, the structural beam 200 is located between the top plate 120 and the bottom plate 130, and at least one structural beam 200 is connected to the top plate 120 and the bottom plate 130. Wherein the second direction is the X direction in the figure.
It can be understood that the structural beam 200 is located between the top plate 120 and the bottom plate 130, and the structural beam 200 is connected to the top plate 120 and the bottom plate 130, so that the structural beam 200, the top plate 120 and the bottom plate 130 form an i-shaped structure, and the i-shaped structure has high strength and rigidity, thereby meeting the requirements of the box body of the battery pack 10 on the properties of bearing, impact resistance, extrusion resistance and the like. Moreover, the battery pack 10 of the present application has a relatively simple case structure, a relatively low manufacturing cost, and a relatively high space utilization rate. In addition, the structural beam 200 divides the box body into a plurality of accommodating cavities 300, and when a thermal runaway occurs to an electric core assembly or a single battery in one of the accommodating cavities 300, other accommodating cavities 300 are not affected, so that the working safety of the battery pack 10 can be improved. In addition, when installing this kind of battery package 10 on whole car, this battery package 10's structural strength can regard as a part of whole car structural strength to can promote whole car's structural strength, be favorable to realizing the design requirement of whole car lightweight of electric automobile, also reduce the design and the manufacturing cost of whole car simultaneously.
It should be noted that the structural beam 200 is connected to the top plate 120 and the bottom plate 130, and it is understood that the structural beam 200 is connected to the top plate 120 and the bottom plate 130, for example, the structural beam 200 is integrally formed with the top plate 120 and the bottom plate 130; alternatively, one of the top plate 120 and the bottom plate 130 is integrally formed with the structural beam 200, and the other is welded to the structural beam 200; alternatively, the structural beam 200, the top plate 120 and the bottom plate 130 are separately manufactured, and then one end of the structural beam 200 is welded to the bottom plate 130 and the other end of the structural beam 200 opposite to the top plate 120.
In one embodiment, as shown in the drawings, the structural beams 200 are provided in plurality, a plurality of the structural beams 200 are spaced apart along a third direction, the length of the structural beam 200 extends along the first direction, and a plurality of the structural beams 200 are connected to the top plate 120 and the bottom plate 130; the tank body 100 is integrally formed with the structural beam 200. Wherein the first direction is different from the third direction.
In the present application, the first direction is a width direction of the box body, and the third direction is a length direction of the box body; or the first direction is the length direction of the box body, and the third direction is the width direction of the box body. Wherein, the first direction is the Z direction in the figure, and the third direction is the Y direction in the figure.
It can be understood that, when the plurality of structural beams 200 are connected to the top plate 120 and the bottom plate 130, each of the structural beams 200, the top plate 120 and the bottom plate 130 forms an i-shaped structure, so that the box body of the battery pack 10 is integrally formed into a honeycomb structure, and the structure has high strength and rigidity, thereby meeting the requirements of the box body on the properties of bearing, impact resistance, extrusion resistance and the like. Moreover, the box body has relatively simple structure and higher space utilization rate. When the battery pack 10 is mounted on the whole vehicle, the structural strength of the battery pack 10 can be used as a part of the structural strength of the whole vehicle, so that the structural strength of the whole vehicle can be improved, the design requirement of light weight of the whole vehicle of the electric vehicle is favorably met, and the design and manufacturing cost of the whole vehicle is reduced.
However, in other embodiments, any two of the first direction, the second direction and the third direction may be disposed at other angles, for example, 80 ° or 85 °, and the present application is not limited thereto.
In one embodiment, the tank body 100 is integrally formed with the structural beam 200. So set up, not only processing technology is simple, is favorable to reduction in production cost, but also can guarantee that the box has sufficient structural strength and rigidity to satisfy the requirement of the performance such as bearing, crashproof and anti extrusion of box.
In one embodiment, as shown in the drawings, the box body 100 further includes a first frame and a second frame distributed on two sides of the box body 100 along the third direction.
Specifically, the box body 100 includes a top plate 120 and a bottom plate 130 oppositely disposed along the second direction, and a first frame 140 and a second frame 150 oppositely disposed along the third direction, wherein the top plate 120, the first frame 140, the bottom plate 130 and the second frame 150 are connected to form an accommodating space, and the structural beam 200 is located in the accommodating space.
It should be noted that the top plate 120, the first frame 140, the bottom plate 130 and the second frame 150 are connected, and it is understood that the first frame and the second frame are separately formed and then welded to the top plate 120 and the bottom plate 130, respectively. Or the top plate 120, the first frame, the bottom plate 130 and the second frame are integrally formed.
In one embodiment, the top plate 120, the first rim 140, the bottom plate 130, the second rim 150 and the structural beam 200 are integrally formed, for example, by extrusion molding of an integral aluminum profile. Therefore, the box body of the battery pack 10 can have higher structural strength, the manufacturing process can be simplified, and the processing cost can be reduced.
In a further embodiment, at least one of the first frame 140 and the second frame 150 has a cavity therein, and a reinforcing plate 141 is disposed in the cavity, wherein the reinforcing plate 141 divides the cavity into a plurality of sub-cavities. With such an arrangement, the first frame 140 and the second frame 150 can have certain strength, which is beneficial to improving the impact resistance and the extrusion resistance of the battery pack 10.
In a further embodiment, the first frame 140 and the second frame 150 are provided with a mounting portion 110 (as shown in fig. 2), and the mounting portion 110 is used for being connected and fixed with an external load.
Of course, in other embodiments, the mounting portion 110 may be disposed on the top plate 120 or the bottom plate 130.
In one embodiment, as shown in fig. 2, the mounting portion 110 is a mounting hole 111 disposed on the first frame 140 and the second frame 150. The mounting holes 111 are used for fasteners (e.g., bolts or rivets) to be inserted therethrough to couple and fix the battery pack 10 to an external load.
Specifically, the mounting holes 111 provided on the first bezel 140 penetrate the first bezel 140 in the second direction, and the mounting holes 111 provided on the second bezel 150 penetrate the second bezel 150 in the second direction. However, the axial direction of the mounting hole 111 may also be arranged at an angle to the second direction, for example 5 ° or 10 °.
Further, a plurality of mounting holes 111 are provided, and the mounting holes 111 provided in the first frame 140 are sequentially arranged along the length direction of the first frame 140. The length direction of the first frame 140 is parallel to the first direction.
Similarly, the mounting holes 111 disposed on the second frame 150 are sequentially arranged along the length direction of the second frame 150. The length direction of the second frame 150 is parallel to the first direction.
Of course, in another embodiment, the mounting portion 110 is a hanging ring disposed on the first and second rims 140 and 150. The hanging ring is fixedly connected with the vehicle body so as to connect and fix the battery pack 10 to an external load.
However, in another embodiment, the mounting portion 110 is a mounting block disposed on the first and second rims 140 and 150, and the mounting block may be fixed to the vehicle body by welding. Of course, the mounting block may also be fixed to the external load by gluing or snapping.
In some embodiments, as shown in fig. 2, 15 and 16, the plurality of pole core groups 400 constituting the pole core string 401 are arranged along a first direction, and the length of the pole core string 401 extends along the first direction. The end of the accommodating cavity 300 along the first direction has a first opening, and two pole core groups 400 located on the same side and adjacent to the first opening of the accommodating cavity 300 in two pole core strings 401 in any two accommodating cavities 300 are electrically connected through a first conductive member 460. So set up, the route that two utmost point core groups 400 electricity are connected is relatively short, is favorable to reducing the internal resistance. In fig. 15 and 16, it is illustrated that two pole core groups 400 located on the same side and adjacent to the first opening of the accommodating cavity 300 in two pole core strings 401 in two adjacent accommodating cavities 300 are electrically connected through a first conductive member 460. In other words, two pole core strings 401 electrically connected to the first conductive member 460 are respectively defined as a first pole core string 401 and a second pole core string 401, and two pole core groups 400 located on the same side and adjacent to the opening of the accommodating cavity 300 in the first pole core string 401 and the second pole core string 401 are electrically connected through the first conductive member 460. Referring to fig. 10, the first pole core string 401 may be a pole core string 401 located above, the second pole core string 401 may be a pole core string 401 located below, and the leftmost pole core group 400 in the first pole core string 401 is electrically connected to the leftmost pole core group 400 in the second pole core string 401.
Further, two ends of the accommodating cavity 300 along the first direction have first openings, please further refer to fig. 11, two pole core groups 400 located at the same side and adjacent to the first opening of the accommodating cavity 300 in two pole core strings 401 in two adjacent accommodating cavities 300 are electrically connected through a first conductive member 460. The first pole core string 401 may be one pole core string 401 located above, the second pole core string 401 may be one pole core string 401 located below, the leftmost pole core group 400 in the first pole core string 401 is electrically connected to the leftmost pole core group 400 in the second pole core string 401, and the rightmost pole core group 400 in the first pole core string 401 is electrically connected to the rightmost pole core group 400 in the second pole core string 401. The arrangement can ensure that the path of the electric connection is relatively short, and is beneficial to reducing the internal resistance.
In one embodiment, as shown in fig. 15 to 16 and 19 to 21, the pole core group 400 includes an electrode drawing part for drawing current, the first conductive member 460 is disposed on a side of the insulating fixing member 600 away from the pole core group 400, and the electrode drawing part of one pole core group 400 and the electrode drawing part of the other pole core group 400 of the two pole core groups 400 electrically connected to the first conductive member 460 correspondingly penetrate through the insulating fixing member 600 and are electrically connected to the first conductive member 460.
Specifically, the electrode leading-out parts of the electrode core group 400 comprise a first electrode leading-out part 410 and a second electrode leading-out part 420, and the first electrode leading-out part 410 and the second electrode leading-out part 420 are distributed on two opposite sides of the electrode core group 400 along the first direction; the first electrode leading-out part 410 of one pole core group 400 of two adjacent pole core groups 400 in the pole core string 401 is electrically connected with the second electrode leading-out part 420 of the other pole core group 400; the first electrode drawing part 410 of one pole core group 400 of the two pole core groups 400 electrically connected to the first conductive member 460 correspondingly and the first electrode drawing part 410 of the other pole core group 400 penetrate the insulating fixing member 600 and are electrically connected to the first conductive member 460, so that the two pole core groups 400 are connected in parallel.
Referring to fig. 21, the insulating fixing member 600 is provided with a first insertion hole 660 and a second insertion hole 670, and the first electrode drawing member 410 passes through the first insertion hole 660 and is connected to one end of the first conductive member 460; the second electrode drawing member 420 passes through the second insertion hole 670 and is connected to the other end of the first conductive member 460.
In another embodiment, different from the above-mentioned embodiment, the second electrode drawing part 420 of one of the two pole core groups 400 electrically connected corresponding to the first conductive member 460 and the second electrode drawing part 420 of the other pole core group 400 penetrate the insulating fixture 600 and are electrically connected to the first conductive member 460, so as to realize the parallel connection of the two pole core groups 400.
In another embodiment, different from the above-mentioned embodiment, the first electrode drawing part 410 of one of the two pole core groups 400 electrically connected corresponding to the first conductive member 460 and the second electrode drawing part 420 of the other pole core group 400 penetrate the insulating fixture 600 and are electrically connected to the first conductive member 460, so that the two pole core groups 400 are connected in series.
In one embodiment, the electrode lead-out component of at least one of the two pole core groups 400 electrically connected to the first conductive member 460 includes a bent portion fixed to a side of the first conductive member 460 away from the accommodating cavity 300.
Specifically, referring to fig. 20, in the present embodiment, the bent portion of the first electrode lead-out component 410 of one of the two electrode core groups 400 electrically connected to the first conductive member 460 is a first bent portion 411, and the first bent portion 411 is fixedly connected to one end of the first conductive member 460; the second bending part 421 is a bending part of the second electrode lead-out part 420 of the other electrode core group 400, and the second bending part 421 is fixedly connected to the other end of the first conductive member 460. The first bending portion 411 is welded to one end of the first conductive member 460, and the second bending portion 421 is welded to the other end of the first conductive member 460.
Referring to fig. 22 to 25, in another embodiment, the first conductive member 460 includes a first fixing portion 461 and a second fixing portion 462 (see fig. 23) which are oppositely disposed, an electrode lead-out component of one of the two pole core groups 400 electrically connected to the first conductive member 460 is fixedly connected to the first fixing portion 461, and an electrode lead-out component of the other pole core group 400 is fixedly connected to the second fixing portion 462.
Specifically, in the present embodiment, the first electrode drawing part 410 of one of the two pole core groups 400 electrically connected corresponding to the first conductive member 460 is fixedly connected to the first fixing part 461, and the second electrode drawing part 420 of the other pole core group 400 is fixedly connected to the second fixing part 462, so that the two pole core groups 400 are connected in series. In some embodiments, the first electrode drawing parts 410 of the two electrode core groups 400 electrically connected corresponding to the first conductive member 460 are connected to the first fixing part 461 and the second fixing part 462, respectively, such that the two electrode core groups 400 are connected in parallel. In other embodiments, the second electrode drawing parts 420 of the two electrode core groups 400 electrically connected corresponding to the first conductive member 460 are respectively connected to the first fixing part 461 and the second fixing part 462, so that the two electrode core groups 400 are connected in parallel.
In a further embodiment, the electrode lead-out part of one of the two pole core groups 400 electrically connected to the first conductive member 460 is fixedly connected to the first fixing part 461 by welding, and the electrode lead-out part of the other pole core group 400 is fixedly connected to the second fixing part 462 by welding.
Referring to fig. 25, in a further embodiment, the first conductive member 460 is provided with at least one connection hole 640 penetrating through the first conductive member 460, the insulating fixing member 600 includes a connection pin 650, and the connection pin 650 penetrates through the connection hole 640 to fixedly connect the insulating fixing member 600 and the first conductive member 460. In the present embodiment, the coupling hole 640 and the coupling nail 650 are two. Wherein the coupling nail 650 and the coupling hole 640 may be coupled by screw.
In a further embodiment, a plurality of pole core groups 400 constituting the pole core string 401 are sequentially arranged along a first direction (as shown in fig. 2 and 3), and the length direction of the pole core string 401 extends along the first direction; the pole core group 400 comprises a first electrode leading-out part 410 and a second electrode leading-out part 420 for leading out current, wherein the first electrode leading-out part 410 and the second electrode leading-out part 420 are distributed on two opposite sides of the pole core group 400 along a first direction (refer to fig. 4a and 4 b). That is, a plurality of pole core groups 400 adopt the mode of arranging of "head to head", and two liang of series connections between the pole core group 400 can be realized comparatively conveniently to this mode of arranging, and connection structure is simple.
In an embodiment, the length of the accommodating chamber 300 along the first direction is greater than 500mm, and further, the length of the accommodating chamber 300 along the first direction is 500mm to 2500 mm. By such a design, the length of the pole core string 401 disposed in the accommodating cavity 300 can be made longer, that is, more pole core sets 400 can be accommodated, so that the battery pack 10 can meet the requirements of larger capacity and higher space utilization rate.
Further, the length of the accommodating chamber 300 in the first direction is 1000mm to 2000 mm.
Further, the length of the accommodating cavity 300 along the first direction is 1300mm-2200 mm.
In some embodiments, the length of the pole core string 401 is greater than 400mm, and further, the length of the pole core string 401 is 400mm to 2500 mm. Further, the pole core string 401 has a length of 1000mm to 2000 mm. Further, the pole core string 401 has a length of 1300mm to 2200 mm. It can be understood that, by arranging a plurality of pole core groups 400 in series to form the pole core string 401 in the accommodation chamber 300, the internal resistance can be reduced as compared with the conventional case in which only one pole core group 400 having the same length as the pole core string 401 is arranged. Because, once the longer the pole core group 400 is, the length of the copper aluminum foil used as the current collector is increased correspondingly, the internal resistance is greatly improved, the current requirements of higher and higher power and quick charging cannot be met, and the problem can be avoided by adopting the serial connection mode of the plurality of pole core groups 400.
In an embodiment, as shown in fig. 2, a plurality of pole core strings 401 are disposed in the accommodating cavity 300, the plurality of pole core strings 401 are sequentially arranged and electrically connected along a thickness direction of the pole core assembly 400, and the thickness direction of the pole core assembly 400 is parallel to a third direction. By such an arrangement, more pole core strings 401 can be arranged in the accommodating cavity 300 to meet the requirement of practical use.
Several cases of electrically connecting the plurality of pole core strings 401 in the same receiving cavity 300 will be described in detail below, and it should be noted that the following description is only an example, and the embodiments of the present application are not limited thereto:
referring to fig. 5 and 6, in a further embodiment, a plurality of pole core strings 401 in the same housing 300 are connected in series.
The first pole-core group 400 of one pole-core string 401 of the adjacent two pole-core strings 401 is electrically connected with the first pole-core group 400 of the other pole-core string 401. Alternatively, the last pole-core group 400 of one pole-core string 401 of the two adjacent pole-core strings 401 is electrically connected with the last pole-core group 400 of the other pole-core string 401. As shown in fig. 5 and 6, the leftmost pole core group 400 is the first pole core group 400, and the rightmost pole core group 400 is the last pole core group in the two pole core strings 401.
Further, the first electrode lead-out part 410 of the first pole core group 400 of one pole core string 401 of two adjacent pole core strings 401 is located on the same side as the second electrode lead-out part 420 of the first pole core group 400 of the other pole core string 401 (as shown in fig. 5). Alternatively, the second electrode lead-out part 420 of the last pole core group 400 of one pole core string 401 of two adjacent pole core strings 401 is located on the same side as the first electrode lead-out part 410 of the last pole core group 400 of the other pole core string 401 (as shown in fig. 6).
The pole core strings 401 in the same accommodating cavity 300 are connected in series in the connection mode, so that the wiring space of the connecting line can be saved. In other embodiments, other series connections may be used.
Referring to fig. 7, in a further embodiment, a plurality of pole piece strings 401 in the same containing cavity 300 are connected in parallel.
The first pole-core group 400 of one pole-core string 401 of the adjacent two pole-core strings 401 is electrically connected with the first pole-core group 400 of the other pole-core string 401, and the last pole-core group 400 of one pole-core string 401 of the adjacent two pole-core strings 401 is electrically connected with the last pole-core group 400 of the other pole-core string 401. As shown in fig. 7, the leftmost pole core group 400 is the first pole core group 400, and the rightmost pole core group 400 is the last pole core group in the two pole core strings 401.
Specifically, the first electrode leading-out part 410 of the first pole core group 400 of one pole core string 401 in two adjacent pole core strings 401 is located on the same side as the first electrode leading-out part 410 of the first pole core group 400 of the other pole core string 401, and the second electrode leading-out part 420 of the last pole core group 400 of one pole core string 401 in two adjacent pole core strings 401 is located on the same side as the second electrode leading-out part 420 of the last pole core group 400 of the other pole core string 401.
The pole core strings 401 in the same accommodating cavity 300 are connected in parallel by adopting the connection mode, so that the wiring space of the connecting wire can be saved. In other embodiments, other parallel connections may be used.
Further, several cases in which the pole core strings 401 of two adjacent receiving cavities 300 are electrically connected through the first conductive member 460 will be specifically described below, and it should be noted that the following description is only an example, and the embodiment of the present application is not limited thereto:
referring to fig. 8, in a further embodiment, the pole core strings 401 in two adjacent receiving cavities 300 are connected in series by a first conductive member 460.
The first pole core group 400 of one pole core string 401 in one accommodating cavity 300 of two adjacent accommodating cavities 300 is electrically connected with the first pole core group 400 of one pole core string 401 in the other accommodating cavity 300 through a first conductive member 460; alternatively, the last pole-core group 400 of one of the pole-core strings 401 in one of the adjacent two receiving cavities 300 is electrically connected with the last pole-core group 400 of one of the pole-core strings 401 in the other receiving cavity 300 through the first conductive member 460. In fig. 8, the first pole-core group 400 of the pole-core string 401 is the leftmost pole-core group 400, and the last pole-core group 400 of the pole-core string 401 is the rightmost pole-core group 400. Alternatively, the first pole-core group 400 of the pole-core string 401 is the rightmost pole-core group 400, and the last pole-core group 400 of the pole-core string 401 is the leftmost pole-core group 400. Fig. 8 shows a case where three pole core strings 401 are included in each accommodation chamber 300, and two pole core strings 401 that are located closest to each other in the two accommodation chambers 300 are electrically connected by a first conductive member 460; in other embodiments, 1 or different from 3 pole core strings 401 may be included in the accommodating cavity 300, and when a plurality of pole core strings 401 are included in the accommodating cavity 300, it may further include electrically connecting a first pole core string 401 of one accommodating cavity 300 in the third direction with a second pole core string 401 of another accommodating cavity 300 in the third direction through the first conductive member 460, that is, it may be that two pole core strings 401 at the nearest position in the two accommodating cavities 300 are not electrically connected through the first conductive member 460.
In a further embodiment, the first electrode lead-out part 410 of the first pole core group 400 of one of the pole core strings 401 in one of the two adjacent accommodating cavities 300 is located on the same side as the second electrode lead-out part 420 of the first pole core group 400 of one of the pole core strings 401 in the other accommodating cavity 300;
alternatively, the first electrode lead-out member 410 of the last pole core group 400 of one of the pole core strings 401 in one of the two adjacent receiving cavities 300 is located on the same side as the second electrode lead-out member 420 of the last pole core group 400 of one of the pole core strings 401 in the other receiving cavity 300.
The pole core strings 401 in the two adjacent accommodating cavities 300 are connected in series in the connection mode, so that the wiring space of the connecting line can be saved. In other embodiments, other series connections may be used.
In some preferred embodiments, two adjacent receiving cavities 300 are respectively defined as a first receiving cavity 300 and a second receiving cavity 300, and one pole core string 401 in the first receiving cavity 300 adjacent to the second receiving cavity 300 is connected in series with one pole core string 401 in the second receiving cavity 300 adjacent to the first receiving cavity 300 through a first conductive member 460.
Specifically, the first pole core group 400 of one pole core string 401 disposed adjacent to the second accommodation cavity 300 in the first accommodation cavity 300 is electrically connected with the first pole core group 400 of one pole core string 401 disposed adjacent to the first accommodation cavity 300 in the second accommodation cavity 300 through the first conductive member 460.
Alternatively, the last pole core group 400 of one pole core string 401 disposed adjacent to the second accommodation cavity 300 in the first accommodation cavity 300 and the last pole core group 400 of one pole core string 401 disposed adjacent to the first accommodation cavity 300 in the second accommodation cavity 300 are electrically connected through the first conductive member 460.
It can be understood that the wiring space of the connecting line can be saved by adopting the connecting mode.
Referring to fig. 9, in a further embodiment, the pole core strings 401 in two adjacent receiving cavities 300 are connected in parallel by a first conductive member 460.
The first pole-core group 400 of one of the pole-core strings 401 in one of the adjacent two accommodating cavities 300 is electrically connected with the first pole-core group 400 of one of the pole-core strings 401 in the other accommodating cavity 300 through the first conductive member 460, and the last pole-core group 400 of one of the pole-core strings 401 in one of the adjacent two accommodating cavities 300 is electrically connected with the last pole-core group 400 of one of the pole-core strings 401 in the other accommodating cavity 300 through the first conductive member 460. In fig. 9, the first pole-core group 400 of the pole-core string 401 is the leftmost pole-core group 400, and the last pole-core group 400 of the pole-core string 401 is the rightmost pole-core group 400. Alternatively, the first pole-core group 400 of the pole-core string 401 is the rightmost pole-core group 400, and the last pole-core group 400 of the pole-core string 401 is the leftmost pole-core group 400.
Specifically, the first electrode drawing part 410 of the first pole core group 400 of one of the pole core strings 401 in one of the two adjacent accommodating cavities 300 is located on the same side as the first electrode drawing part 410 of the first pole core group 400 of one of the pole core strings 401 in the other accommodating cavity 300, and the second electrode drawing part 420 of the last pole core group 400 of one of the pole core strings 401 in one of the two adjacent accommodating cavities 300 is located on the same side as the second electrode drawing part 420 of the last pole core group 400 of one of the pole core strings 401 in the other accommodating cavity 300.
The pole core strings 401 in the two adjacent accommodating cavities 300 are connected in parallel in the connection mode, so that the wiring space of the connecting wire can be saved. In other embodiments, other parallel connections may be used.
Preferably, two adjacent accommodating cavities 300 are respectively defined as a first accommodating cavity 300 and a second accommodating cavity 300, and one pole core string 401 arranged adjacent to the second accommodating cavity 300 in the first accommodating cavity 300 is connected in parallel with one pole core string 401 arranged adjacent to the first accommodating cavity 300 in the second accommodating cavity 300 through a first conductive member 460.
Specifically, the first pole core group 400 of one pole core string 401 disposed adjacent to the second accommodation cavity 300 in the first accommodation cavity 300 is electrically connected to the first pole core group 400 of one pole core string 401 disposed adjacent to the first accommodation cavity 300 in the second accommodation cavity 300 through the first conductive member 460, and the last pole core group 400 of one pole core string 401 disposed adjacent to the second accommodation cavity 300 in the first accommodation cavity 300 is electrically connected to the last pole core group 400 of one pole core string 401 disposed adjacent to the first accommodation cavity 300 in the second accommodation cavity 300 through the first conductive member 460. It can be understood that the wiring space of the connecting line can be saved by adopting the connecting mode.
As for the manner in which one pole core string 401 is disposed in each accommodating cavity 300, the manner in which the pole core strings 401 of two adjacent accommodating cavities 300 are electrically connected through the first conductive member 460 is similar to the manner described above, and only briefly described below:
in some embodiments, as shown in fig. 10, only one pole core string 401 is disposed in the accommodating cavity 300, and the pole core groups 400 in two adjacent accommodating cavities 300 are connected in series by the first conductive member 460: the first pole core group 400 of the pole core string 401 in one accommodating cavity 300 of the two adjacent accommodating cavities 300 is electrically connected with the first pole core group 400 of the pole core string 401 in the other accommodating cavity 300 through a first conductive member 460; alternatively, the last pole core group 400 of the pole core string 401 in one accommodation cavity 300 of the two adjacent accommodation cavities 300 is electrically connected with the last pole core group 400 of the pole core string 401 in the other accommodation cavity 300 through the first conductive member 460. In fig. 10, the first pole-core group 400 of the pole-core string 401 is the leftmost pole-core group 400, and the last pole-core group 400 of the pole-core string 401 is the rightmost pole-core group 400. Alternatively, the first pole-core group 400 of the pole-core string 401 is the rightmost pole-core group 400, and the last pole-core group 400 of the pole-core string 401 is the leftmost pole-core group 400.
In some embodiments, as shown in fig. 11, only one pole core string 401 is disposed in the accommodating cavity 300, and the pole core groups 400 in two adjacent accommodating cavities 300 are connected in parallel by the first conductive member 460: the first pole core group 400 of the pole core string 401 in one accommodating cavity 300 of the two adjacent accommodating cavities 300 is electrically connected with the first pole core group 400 of the pole core string 401 in the other accommodating cavity 300 through the first conductive member 460, and the last pole core group 400 of the pole core string 401 in one accommodating cavity 300 of the two adjacent accommodating cavities 300 is electrically connected with the last pole core group 400 of the pole core string 401 in the other accommodating cavity 300 through the first conductive member 460. In fig. 11, the first pole-core group 400 of the pole-core string 401 is the leftmost pole-core group 400, and the last pole-core group 400 of the pole-core string 401 is the rightmost pole-core group 400. Alternatively, the first pole-core group 400 of the pole-core string 401 is the rightmost pole-core group 400, and the last pole-core group 400 of the pole-core string 401 is the leftmost pole-core group 400.
Referring to fig. 4a and 4b again, in a further embodiment, the pole core group 400 includes a pole core group main body 430, and a first electrode leading-out part 410 and a second electrode leading-out part 420 for leading out current, the first electrode leading-out part 410 and the second electrode leading-out part 420 are distributed on opposite sides of the pole core group main body 430 along a first direction, and the first electrode leading-out part 410 of one pole core group 400 and the second electrode leading-out part 420 of another pole core group 400 of two adjacent pole core groups 400 constituting the pole core string 401 are electrically connected through a second conductive member 440;
a fixed spacing ring 450 is arranged between the pole core group main bodies 430 of two adjacent pole core groups 400, and the second conductive member 440 is fixed in the fixed spacing ring 450; structural adhesive is filled between the pole core group main body 430 and the fixed space ring 450 of two adjacent pole core groups 400;
the fixed space ring 450 includes a first space ring 453 and a second space ring 454 which are oppositely arranged along the third direction, the second conductive member 440 is located between the first space ring 453 and the second space ring 454, and the first space ring 453 and the second space ring 454 are connected to clamp and fix the second conductive member 440. Specifically, a pin 451 is provided on the first space ring 453, an insertion hole 452 is provided on the second space ring 454, and the pin 451 is inserted into the insertion hole 452 to fixedly connect the first space ring 453 and the second space ring 454.
In one embodiment, the second conductive member 440 is a connecting piece, such as a copper bar or an aluminum bar.
Referring to fig. 12, in a further embodiment, the plurality of pole-core groups 400 constituting the pole-core string 401 are encapsulated in an encapsulation film 500; the pole core group 400 comprises a pole core group main body 430, and a first electrode leading-out part 410 and a second electrode leading-out part 420 for leading out current, wherein the connection part of the first electrode leading-out part 410 of one pole core group 400 and the second electrode leading-out part 420 of the other pole core group 400 in the two pole core groups 400 connected in series is positioned in the encapsulation film 500; a sealing part 510 is formed at a position of the sealing film 500 opposite to the first electrode lead-out member 410 and/or the second electrode lead-out member 420 to isolate adjacent two pole core group bodies 430.
Keep apart between the core group 400 of a plurality of utmost points through encapsulation portion 510, avoid the electrolyte between the core group 400 of a plurality of utmost points to circulate each other, can not influence each other between the core group 400 of a plurality of utmost points, and the electrolyte in the core group 400 of a plurality of utmost points can not be because of the too big decomposition of potential difference, guarantees the security and the life of battery.
The enclosure portion 510 may be implemented in various ways, for example, the enclosure portion 510 may be formed by tightening the enclosure film 500 with a tie, or the enclosure portion 510 may be formed by directly thermally fusing the enclosure film 500. The specific manner of the encapsulation portion 510 is not particularly limited.
In this application, the preferable sealing material used for the sealing film 500 is a PET and PP composite film or an aluminum plastic film. And adopt and can expand after the partial volume ization of utmost point core group 400, in this application preferred, take out the negative pressure with the inside cavity of encapsulation membrane 500 and retrain utmost point core group 400, consequently have the gas tightness requirement to holding chamber 300 in the encapsulation membrane 500.
Referring to fig. 13, in other embodiments, each of the pole core groups 400 is encapsulated in an encapsulation film 500 to form pole core assemblies, which are connected in series.
In other words, the number of the encapsulation films 500 corresponds to the number of the pole core groups 400 one by one, and each pole core group 400 is individually encapsulated in one encapsulation film 500, in this embodiment, after the preparation of a plurality of pole core groups 400 is completed, one encapsulation film 500 can be individually encapsulated outside each pole core group 400, and then the pole core assemblies are connected in series.
Referring to fig. 14, in a further embodiment, a heat dissipation channel 210 is disposed in the structural beam 200; like this, the heat that pole core group 400 produced can get into heat dissipation channel 210 in the back via roof 120 and bottom plate 130 transmit to outside the box, compare with the structure roof beam 200 that adopts solid structure design, this kind of structural design of this application has increased the heat dissipation space in the box to be favorable to improving cooling radiating's effect.
Further, the length of the pole core assembly 400 extends along a first direction, and the thickness of the pole core assembly 400 extends along a third direction; the surface of the pole core assembly 400 in the third direction faces the structural beam 200, and the extension direction of the heat dissipation channel 210 is the same as the first direction. That is, the surface of the pole core assembly 400 with the largest area corresponding to the thickness direction is close to the structural beam 200, so that the heat dissipation efficiency of the heat dissipation channel 210 in the structural beam 200 to the pole core assembly 400 can be increased.
In a further embodiment, the structural beam 200 includes a first side plate 220 and a second side plate 230 spaced apart from each other along the third direction, and the first side plate 220, the second side plate 230, the top plate 120 and the bottom plate 130 together enclose the heat dissipation channel 210. In other words, the space enclosed by the first side plate 220, the second side plate 230, the top plate 120 and the bottom plate 130 is the heat dissipation channel 210. That is, the heat dissipation channel 210 is formed by the assembly of the case and the structural beams 200 without additionally providing a heat dissipation pipe to form the heat dissipation channel 210, saving materials, and the heat dissipation channel 210 is formed in the battery pack 10 without affecting the structural stability of the entire battery pack 10.
In a further embodiment, the structural beam 200 further includes a partition 240 connected to the first side plate 220 and the second side plate 230, wherein the partition 240 divides the heat dissipation channel 210 into a plurality of sub-channels. The number of the partition plates 240 is not limited, and when there are a plurality of partition plates 240, it is preferable that the partition plates 240 are symmetrically disposed between the first side plate 220 and the second side plate 230, and the symmetrical structure may improve the stability of the structural beam 200.
In one embodiment, as shown in fig. 1 and 2, the box body 100 is provided with a second opening 180 at an end along the first direction; the box also includes an end plate 112 that closes the second opening 180. It can be understood that the pole core string 401 can be installed in the accommodating cavity 300 through the second opening 180, and this installation is convenient for operation, and at the same time, ensures a high structural strength of the case.
Further, both ends of the box body 100 along the second direction are provided with second openings 180; the end plate 112 includes a third frame 160 and a fourth frame 170, and the third frame 160 and the fourth frame 170 are hermetically connected with the box body 100 to close the corresponding second openings 180. That is, the third rim 160 and the fourth rim 170 are distributed at both ends of the tank body 100 along the first direction, the third rim 160 is hermetically connected with the tank body 100 to close the second opening 180 disposed adjacent to the third rim 160, and the fourth rim 170 is hermetically connected with the tank body 100 to close the second opening 180 disposed adjacent to the fourth rim 170. It can be understood that when the case body 100 is provided with the second openings 180 at both ends in the first direction, the first and second electrodes (i.e., the positive and negative electrodes) of the pole core string 401 located in the accommodating chamber 300 may be respectively led out from the two second openings 180.
Further, the tank body 100, the third frame 160, and the fourth frame 170 are metal members, and are hermetically connected by welding.
However, in other embodiments, the box body 100, the third rim 160 and the fourth rim 170 may be made of plastic. Furthermore, the third frame 160 and the fourth frame 170 can be connected to the box body 100 by gluing or clipping.
Further, the third frame 160 and the fourth frame 170 are hollow, and reinforcing plates are arranged in the third frame 160 and the fourth frame 170, and divide the inner space of the third frame 160 and the fourth frame 170 into a plurality of sub-cavities. With such an arrangement, the third frame 160 and the fourth frame 170 can be ensured to have certain strength, which is beneficial to improving the impact resistance and the extrusion resistance of the box body 100 of the battery pack 10.
In one embodiment, the battery pack 10 further includes a sealing plate, the end of the receiving cavity 300 in the first direction has a first opening, the sealing plate is located at the inner side of the end plate, and the sealing plate is connected to the structural beam 200 and the case body 100 to close a portion of the first opening adjacent to the bottom plate 130. That is, the half-blocking of the first opening is achieved by the sealing plate, so that when the sealing film 500 is accidentally broken, the electrolyte flows from one accommodating chamber 300 to the other accommodating chamber 300 to cause an internal short circuit, thereby improving the safety of the use of the battery pack 10.
The half-sealing of the first openings of the accommodating cavities 300 at two ends of the accommodating cavities 300 may be that the sealing plate is connected to the first frame 140, the bottom plate 130 and the structural beam 200, or the sealing plate is connected to the second frame 150, the bottom plate 130 and the structural beam 200 to seal a portion of the first opening of the accommodating cavity 300 adjacent to the bottom plate 130.
The half-sealing of the first openings of the remaining receiving chambers 300 of the plurality of receiving chambers 300 may be that a sealing plate is connected to the base plate 130 and two adjacent structural beams 200 to seal a portion of the first openings of the receiving chambers 300 adjacent to the base plate 130.
In one embodiment, as shown in the drawings, the battery pack 10 further includes a sealing plate, the end of the receiving cavity 300 in the first direction has a first opening, the sealing plate is located at the inner side of the end plate, and the sealing plate is connected to the structural beam 200 and the case body 100 to completely block the first opening of the receiving cavity 300. That is, the first opening of the receiving cavity 300 is completely closed by the sealing plate to further improve the safety of the use of the battery pack 10.
The first openings of the accommodating chambers 300 located at both ends of the accommodating chambers 300 may be completely sealed by connecting the sealing plates to the first frame 140, the structural beam 200, the top plate 120, and the bottom plate 130, or by connecting the sealing plates to the second frame 150, the structural beam 200, the top plate 120, and the bottom plate 130, so as to completely seal the first openings of the accommodating chambers 300.
The complete sealing of the first openings of the remaining receiving chambers 300 of the plurality of receiving chambers 300 may be performed by connecting the sealing plate to the bottom plate 130, the top plate 120 and the two adjacent structural beams 200 to completely seal the first openings of the receiving chambers 300.
Referring to fig. 15 to 16 again, in a further embodiment, a clamping portion 620 is disposed on the insulating fixing member 600, and the insulating fixing member 600 is clamped and fixed with the structural beam 200 through the clamping portion 620.
Further, as shown in fig. 16, clamping portions 620 are disposed on two sides of the insulating fixing member 600 along the second direction, and the insulating fixing member 600 is clamped and fixed with the structural beam 200 through the clamping portions 620, so that the insulating fixing member 600 is connected and fixed with the box body.
Specifically, joint portion 620 sets up along the second direction relatively, and joint portion 620 is equipped with a plurality ofly, and a plurality of joint portions 620 arrange along the third direction, and the direction of arranging of joint portion 620 is the same with the direction of arranging of structure roof beam 200, all arranges along the third direction.
In a further embodiment, the end of the structural beam 200 is provided with a recess 250 recessed away from the insulating fixing member 600, two opposite sidewalls of the recess 250 are extensions 260 of the structural beam 200, and the insulating fixing member 600 is fastened with the extensions 260 by the fastening portion 620 to be fixed in the recess 250. It can be understood that the length of the box body along the first direction cannot be increased by adopting the structural design, and the size of the box body is favorably reduced.
In a further embodiment, the latching portion 620 is provided with a groove 621, the extending portion 260 is a latch, and the latch 620 is latched in the groove 261. In this embodiment, since the structural beam 200 includes the first side plate 220 and the second side plate 230 that are disposed at an interval along the third direction, the extending portion 260 corresponds to two side plate extending portions 260 that are disposed oppositely, and the fastening portion 620 is provided with two grooves 621, and the two side plate extending portions 260 that are disposed oppositely are fastened in the two grooves 621 correspondingly. In other embodiments, the extending portion 260 has a groove therein, and the engaging portion 620 is a latch, and the latch engages in the groove.
In a further embodiment, the battery pack 10 further includes a protective cover 700 (as shown in fig. 15), wherein the protective cover 700 is disposed on a side of the insulating fixture 600 away from the pole core assembly 400. The protective cover 700 protects the insulating fixture 600 and the pole core set 400 and the like located in the receiving cavity 300. As shown in fig. 1 and 15, the protective cover 700 is located on the inner side of the end plate 112, i.e., on the side of the end plate 112 close to the pole core set 400.
In one embodiment, there are two protective covers 700, two protective covers 700 are distributed on two sides of the box body along the first direction, one protective cover 700 is located on the inner side of the third frame 160, and the other protective cover 700 is located on the inner side of the fourth frame 170.
In a further embodiment, two opposite sides of the protective cover 700 are provided with flanged portions 710 extending toward the accommodating cavity 300, one side of the insulating fixing member 600 away from the accommodating cavity 300 is provided with a connecting portion 630, the connecting portion 630 is located at two opposite sides of the first conductive member 460, and the flanged portions 710 are in snap fit with the connecting portion 630 to fixedly connect the protective cover 700 and the insulating fixing member 600. Specifically, as shown in fig. 15 and 17, two sides of the protective cover 700 along the second direction are provided with flanging portions 710, and the connecting portions 630 are distributed on two opposite sides of the first conductive member 460 along the second direction.
In a further embodiment, a hook 631631 is disposed on a side of the connecting portion 630 away from the first conductive member 460, a slot 711 is disposed on the flanged portion 710, and the hook 631631 is clipped in the slot 711, so that the protective cover 700 is fixedly connected to the insulating fixing member 600. In some embodiments, the connecting portion 630 is provided with a locking groove 711, one side of the flanged portion 710 close to the accommodating cavity 300 is provided with a hook 631, and the hook 631 is locked in the locking groove 711, so that the protective cover 700 is fixedly connected to the insulating fixing member 600.
In a further embodiment, the air pressure of the receiving chamber 300 is lower than the air pressure outside the case. The accessible is to holding chamber 300 inside vacuum pumping, and makes the atmospheric pressure that holds chamber 300 be less than the atmospheric pressure outside the box, holds chamber 300 evacuation back, can reduce the stock of materials such as steam, oxygen in the box, avoids steam, oxygen to the long-time ageing of utmost point core group 400 and each spare part in the box, improves the inside utmost point core group 400 of box or the life of each spare part.
In a further embodiment, the tank is provided with a suction hole 190 (shown in FIG. 2). The number of the pumping holes 190 may be one or more, and may be disposed at the position of the top plate 120 or the bottom plate 130 corresponding to the receiving cavity 300, or disposed on the third frame 160 and the fourth frame 170.
In a further embodiment, the box body is provided with glue injection holes 1010 (shown in fig. 1) communicating with the accommodating cavities 300, each accommodating cavity 300 corresponds to at least one glue injection hole 1010, and the glue injection holes 1010 are used for filling glue into the corresponding accommodating cavities 300 so as to fixedly connect the pole core assembly 400 and the box body. Wherein a portion of the glue injection hole 1010 is shown in figure 1. The pole core assembly 400, the case and the structural beam 200 may be fixedly connected together in a potting manner using hollow glass bead filling glue or structural glue, further improving the structural strength of the battery pack 10.
In a further embodiment, two adjacent pole core groups 400 constituting the pole core string 401 are electrically connected through a second conductive member 440, and the glue injection holes are disposed corresponding to the second conductive member 440. So set up, can guarantee to have higher joint strength between utmost point core group 400.
In a further embodiment, the battery pack 10 further includes a sampling component for collecting information of the pole-core set 400, so as to know the current working condition of the pole-core set 400. The information of the pole core group 400 includes the voltage, current or temperature information of the pole core group 400, and may further include the air pressure information in the accommodating cavity 300.
Referring to fig. 18, in a further embodiment, the battery pack 10 further includes a first total electrode 410a and a second total electrode 420a for drawing current, and the first total electrode 410a and the second total electrode 420a are located on the same side of the case along the first direction.
Specifically, the pole core group 400 includes a first electrode drawing part 410 and a second electrode drawing part 420 for drawing current, and the first electrode drawing part 410 and the second electrode drawing part 420 are distributed on two opposite sides of the pole core group 400 along a first direction; a plurality of pole core groups 400 constituting a pole core string 401 in the accommodation cavity 300 are arranged in a first direction and connected in series;
the plurality of receiving cavities 300 are arranged in the third direction, and the first electrode drawing part 410 of the first pole core group 400 in the first receiving cavity 300 arranged in the third direction among the plurality of receiving cavities 300 and the second electrode drawing part 420 of the first pole core group 400 in the last receiving cavity 300 are positioned at the same side of the case; wherein one of the first electrode drawing part 410 and the second electrode drawing part 420 is a first total electrode 410a, and the other is a second total electrode 420 a. One of the first and second total electrodes 410a and 420a is a positive electrode and the other is a negative electrode, so that the directions of the positive and negative current of the whole battery pack 10 are on the same side, so as to facilitate connection with external devices, such as vehicle electronics.
In other embodiments, the second electrode drawing part 420 of the last electrode core group 400 in the first accommodation cavity 300 arranged in the third direction among the plurality of accommodation cavities 300 and the first electrode drawing part 410 of the last electrode core group 400 in the last accommodation cavity 300 are located at the same side of the case. Wherein one of the first electrode drawing part 410 and the second electrode drawing part 420 is a first total electrode 410a, and the other is a second total electrode 420 a. One of the first and second total electrodes 410a and 420a is a positive electrode and the other is a negative electrode, so that the directions of the positive and negative current of the whole battery pack 10 are on the same side, so as to facilitate connection with external devices, such as vehicle electronics.
The application also provides an electric vehicle, which comprises a vehicle body and the battery pack 10, wherein the battery pack 10 is fixed on the vehicle body through the installation part. The application provides an electric motor car, when installing this kind of battery package 10 on whole car, this battery package 10's structural strength can regard as a part of whole car structural strength to can promote the structural strength of whole car, be favorable to realizing whole car of electric automobile. The design requirement of lightweight also reduces design and manufacturing cost of whole car simultaneously. In addition, the height of the battery pack 10 of the present application is relatively low so as not to occupy too much space at the vehicle height.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (33)

1. A battery pack is characterized by comprising a box body and at least one structural beam positioned in the box body, wherein the at least one structural beam divides the inner part of the box body into a plurality of accommodating cavities; a pole core string is arranged in the accommodating cavity and comprises a plurality of pole core groups connected in series; the pole core group is packaged in a packaging film;
the pole core string in the containing cavity is electrically connected through a first conductive piece, the containing cavity is provided with a first opening, an insulating fixing piece is arranged at the first opening of the containing cavity, and the first conductive piece is fixed on the insulating fixing piece.
2. The battery pack according to claim 1, wherein the plurality of pole core groups constituting the pole core string are arranged in a first direction, a length of the pole core string extends in the first direction, and the first direction is a width direction of the case or the first direction is a length direction of the case;
the end part of the containing cavity along the first direction is provided with the first opening, and two pole core groups which are positioned on the same side and are adjacent to the first opening of the containing cavity in two pole core strings in any two containing cavities are electrically connected through a first conductive piece.
3. The battery pack of claim 2, wherein the electrode core groups include electrode drawing parts for drawing current, the first conductive member is provided at a side of the insulating fixing member away from the electrode core groups, and the electrode drawing part of one and the electrode drawing part of the other of the two electrode core groups electrically connected to the first conductive member correspondingly penetrate through the insulating fixing member and are electrically connected to the first conductive member.
4. The battery pack of claim 3, wherein the electrode drawing parts of the electrode core pack comprise first and second electrode drawing parts, the first and second electrode drawing parts being distributed on opposite sides of the electrode core pack in the first direction;
the first electrode leading-out part of one of the two adjacent pole core groups in the pole core string is electrically connected with the second electrode leading-out part of the other pole core group;
the first electrode leading-out component of one of the two pole core groups correspondingly and electrically connected with the first conductive piece and the first electrode leading-out component of the other pole core group penetrate through the insulating fixing piece and are electrically connected with the first conductive piece; alternatively, the first and second electrodes may be,
the second electrode leading-out component of one of the two pole core groups correspondingly and electrically connected with the first conductive piece and the second electrode leading-out component of the other pole core group penetrate through the insulating fixing piece and are electrically connected with the first conductive piece; alternatively, the first and second electrodes may be,
and the first electrode leading-out component of one of the two pole core groups correspondingly and electrically connected with the first conductive piece and the second electrode leading-out component of the other pole core group penetrate through the insulating fixing piece and are electrically connected with the first conductive piece.
5. The battery pack according to claim 3, wherein the electrode lead-out member of at least one of the two electrode core groups electrically connected corresponding to the first conductive member includes a bent portion fixed to a side of the first conductive member facing away from the receiving cavity.
6. The battery pack according to claim 3, wherein the first conductive member includes a first fixing part and a second fixing part which are oppositely disposed, the electrode drawing part of one of the two pole core groups electrically connected to the first conductive member is fixedly connected to the first fixing part, and the electrode drawing part of the other pole core group is fixedly connected to the second fixing part.
7. The battery pack according to claim 1, wherein the first conductive member is provided with at least one connection hole penetrating through the first conductive member, and the insulating fixing member includes a connection pin penetrating through the connection hole to fixedly connect the insulating fixing member and the first conductive member.
8. The battery pack of claim 1, wherein the insulating fixing member is provided with a clamping portion, and the insulating fixing member is clamped and fixed with the structural beam through the clamping portion.
9. The battery pack according to claim 8, wherein the end of the structural beam is provided with a recessed portion recessed away from the insulating fixing member, two opposite sidewalls of the recessed portion are extensions of the structural beam, and the insulating fixing member is fastened to the extending portion through the fastening portion to be fixed in the recessed portion.
10. The battery pack according to claim 9, wherein the extension portion has a groove therein, and the engaging portion is a clip, or the engaging portion has a groove therein, and the extension portion is a clip;
the clamping block is clamped in the groove.
11. The battery pack of claim 1, further comprising a protective cover disposed on a side of the insulating fixture remote from the set of pole cores.
12. The battery pack of claim 11, wherein the protective cover has a flange portion extending toward the receiving cavity at two opposite sides thereof, the insulating fixing member has a connecting portion at one side thereof away from the receiving cavity, the connecting portion is located at two opposite sides of the first conductive member, and the flange portion is engaged with the connecting portion to fixedly connect the protective cover and the insulating fixing member.
13. The battery pack of claim 1, wherein the case body comprises a case body including a top plate and a bottom plate that are oppositely disposed in a second direction, the second direction being a height direction of the case body, the structural beams being located between the top plate and the bottom plate, at least one of the structural beams being connected to the top plate and the bottom plate.
14. The battery pack of claim 13, wherein the plurality of structural beams are spaced apart along a third direction, the length of the structural beams extending along a first direction, the first direction being a width direction of the case, the third direction being a length direction of the case; or the first direction is the length direction of the box body, the third direction is the width direction of the box body, and the plurality of structural beams are connected to the top plate and the bottom plate; the box body and the structural beam are integrally formed.
15. The battery pack of claim 13, wherein the case body further comprises a first rim and a second rim that are distributed on both sides of the case body in the third direction.
16. The battery pack of claim 15, wherein at least one of the first and second rims has a cavity therein, and wherein a reinforcing plate is disposed within the cavity and divides the cavity into a plurality of sub-cavities.
17. The battery pack according to claim 15, wherein the case is provided with a mounting portion for connecting and fixing with an external load; the first frame and the second frame are provided with the installation part.
18. The battery pack according to claim 13, wherein the case body is provided at an end portion in the first direction with a second opening; the case further includes an end plate closing the second opening.
19. The battery pack according to claim 18, wherein both ends of the case body in the first direction are provided with the second openings; the end plate comprises a third frame and a fourth frame, and the third frame and the fourth frame are connected with the box body in a sealing mode to seal the corresponding second openings.
20. The battery pack according to claim 1, wherein the plurality of pole core groups constituting the pole core string are arranged in sequence in a first direction, and a length direction of the pole core string extends in the first direction; the length of the accommodating cavity along the first direction is more than 500mm, and the length of the pole core string is more than 400 mm; the pole core group comprises a first electrode leading-out component and a second electrode leading-out component which are used for leading out current, the first electrode leading-out component and the second electrode leading-out component are distributed on two opposite sides of the pole core group along a first direction, and the first direction is the width direction of the box body or the first direction is the length direction of the box body.
21. The battery pack according to claim 20, wherein a plurality of the pole core strings are disposed in the accommodating cavity, the plurality of pole core strings are sequentially arranged in a thickness direction of the pole core group and are electrically connected, the thickness direction of the pole core group is parallel to a third direction, the first direction is a length direction of the case, and the third direction is a width direction of the case; or, the first direction is the width direction of the box body, and the third direction is the length direction of the box body.
22. The battery pack of claim 21, wherein a plurality of the pole core strings within the same receiving cavity are connected in series;
the first pole core group of one pole core string in two adjacent pole core strings is electrically connected with the first pole core group of the other pole core string, the first electrode lead-out component of the first pole core group of the one pole core string in the two adjacent pole core strings is positioned on the same side as the second electrode lead-out component of the first pole core group of the other pole core string, or the last pole core group of the one pole core string in the two adjacent pole core strings is electrically connected with the last pole core group of the other pole core string, and the second electrode lead-out component of the last pole core group of the one pole core string in the two adjacent pole core strings is positioned on the same side as the first electrode lead-out component of the last pole core group of the other pole core string.
23. The battery pack of claim 21, wherein a plurality of pole pieces within the same receiving cavity are connected in series-parallel;
the first pole core group of one pole core string in the two adjacent pole core strings is electrically connected with the first pole core group of the other pole core string, and the last pole core group of one pole core string in the two adjacent pole core strings is electrically connected with the last pole core group of the other pole core string;
the first electrode leading-out part of the first pole core group of one pole core string in the two adjacent pole core strings and the first electrode leading-out part of the first pole core group of the other pole core string are positioned on the same side, and the second electrode leading-out part of the last pole core group of the one pole core string in the two adjacent pole core strings and the second electrode leading-out part of the last pole core group of the other pole core string are positioned on the same side.
24. The battery pack of claim 21, wherein the pole core strings in adjacent two receiving cavities are connected in series;
the first electrode lead-out component of the first pole core group of one of the pole core strings in one of the two adjacent accommodating cavities is electrically connected with the second electrode lead-out component of the first pole core group of one of the pole core strings in the other accommodating cavity through a first conductive component, or the last pole core group of one of the pole core strings in one of the two adjacent accommodating cavities is electrically connected with the last pole core group of one of the pole core strings in the other accommodating cavity through a first conductive component, and the first electrode lead-out component of the last pole core group of one of the pole core strings in one of the two adjacent accommodating cavities is electrically connected with the second electrode lead-out component of the last pole core group of one of the pole core strings in the other accommodating cavity.
25. The battery pack of claim 21, wherein the pole pieces in adjacent two receiving cavities are connected in series-parallel;
the first pole core group of one of the pole core strings in one of the two adjacent accommodating cavities is electrically connected with the first pole core group of one of the pole core strings in the other accommodating cavity through a first conductive piece, and the last pole core group of one of the pole core strings in one of the two adjacent accommodating cavities is electrically connected with the last pole core group of one of the pole core strings in the other accommodating cavity through a first conductive piece;
the first electrode leading-out part of the first pole core group of one of the pole core strings in one of the two adjacent accommodating cavities and the first electrode leading-out part of the first pole core group of one of the pole core strings in the other accommodating cavity are positioned on the same side, and the second electrode leading-out part of the last pole core group of one of the pole core strings in one of the two adjacent accommodating cavities and the second electrode leading-out part of the last pole core group of one of the pole core strings in the other accommodating cavity are positioned on the same side.
26. The battery pack of claim 20, wherein a pole piece string is disposed within the receiving cavity; the pole core strings in the two adjacent accommodating cavities are connected in series or in parallel;
when the pole core strings in the two adjacent accommodating cavities are connected in series, the first pole core group of the pole core string in one accommodating cavity in the two adjacent accommodating cavities is electrically connected with the first pole core group of the pole core string in the other accommodating cavity through a first conductive piece, or the last pole core group of the pole core string in one accommodating cavity in the two adjacent accommodating cavities is electrically connected with the last pole core group of the pole core string in the other accommodating cavity through a first conductive piece;
when two adjacent utmost point core groups that hold the intracavity are parallel connection, two adjacent first utmost point core groups that hold the utmost point core cluster in the intracavity and another first utmost point core group that holds the utmost point core cluster in the intracavity are connected through first electrically conductive piece electricity, and two adjacent last utmost point core groups that hold the utmost point core cluster in the intracavity and another last utmost point core group that holds the utmost point core cluster in the intracavity are connected through first electrically conductive piece electricity.
27. The battery pack according to claim 1, wherein the pole core groups include a pole core group main body and first and second electrode lead-out parts for leading out current, the first and second electrode lead-out parts are distributed on opposite sides of the pole core group main body along a first direction, and the first electrode lead-out part of one pole core group and the second electrode lead-out part of another pole core group of two adjacent pole core groups constituting the pole core string are electrically connected through a second conductive member;
a fixed space ring is arranged between the pole core group main bodies of two adjacent pole core groups, and the second conductive piece is fixed in the fixed space ring; structural adhesive is filled between the pole core group main bodies of the two adjacent pole core groups and the fixed space ring;
the fixed space ring comprises a first space ring and a second space ring which are oppositely arranged along a third direction, the second conductive piece is positioned between the first space ring and the second space ring, and the first space ring and the second space ring are connected to clamp and fix the second conductive piece;
the first direction is the length direction of the box body, and the third direction is the width direction of the box body; or, the first direction is the width direction of the box body, and the third direction is the length direction of the box body.
28. The battery pack of claim 1, wherein the plurality of pole core groups making up the pole core string are encapsulated in an encapsulation film; the pole core group comprises a pole core group main body, a first electrode leading-out part and a second electrode leading-out part, wherein the first electrode leading-out part and the second electrode leading-out part are used for leading out current; and the packaging part is formed at the position of the packaging film opposite to the first electrode lead-out part and/or the second electrode lead-out part so as to separate the adjacent two polar core group main bodies.
29. The battery pack according to claim 1, wherein each of the pole core groups is encapsulated in one encapsulating film to form pole core assemblies, and the pole core assemblies are connected in series.
30. The battery pack of claim 1, wherein the structural beam has a heat dissipation channel therein; the length of the pole core group extends along a first direction, and the thickness of the pole core group extends along a third direction; the surface of the pole core group along the third direction faces the structural beam, the extending direction of the heat dissipation channel is the same as the first direction, and the first direction is different from the third direction.
31. The battery pack of claim 30, wherein the case includes a case body including a top plate and a bottom plate oppositely disposed in the second direction, the structural beam is located between the top plate and the bottom plate, the structural beam includes a first side plate and a second side plate spaced apart in the third direction, and the first side plate, the second side plate, the top plate, and the bottom plate together enclose the heat dissipation channel;
the second direction is the height direction of the box body, the first direction is the width direction of the box body, and the third direction is the length direction of the box body; or, the first direction is the length direction of the box body, and the third direction is the width direction of the box body.
32. The battery pack of claim 1, wherein the battery pack further comprises a first total electrode and a second total electrode for drawing current, the first total electrode and the second total electrode being located on the same side of the case in the first direction;
the box body comprises a box body, the box body comprises a top plate and a bottom plate which are oppositely arranged along a second direction, the structural beams are positioned between the top plate and the bottom plate, and at least one structural beam is connected to the top plate and the bottom plate; the structure beams are distributed at intervals along a third direction, the length of each structure beam extends along the first direction, and the structure beams are connected to the top plate and the bottom plate;
the box body further comprises a first frame and a second frame which are distributed on two sides of the box body along a third direction; the box body and the structural beam are integrally formed;
the box body is provided with first openings at two ends along the first direction, and the box body further comprises a third frame and a fourth frame which are connected with the box body in a sealing manner so as to seal the corresponding first openings;
the second direction is the height direction of the box body, the first direction is the width direction of the box body, and the third direction is the length direction of the box body; or, the first direction is the length direction of the box body, and the third direction is the width direction of the box body.
33. An electric vehicle comprising a vehicle body and the battery pack according to any one of claims 1 to 32, wherein the battery pack is fixed to the vehicle body by the mounting portion.
CN202010334713.7A 2020-04-24 2020-04-24 Battery pack and electric vehicle Pending CN113644350A (en)

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