CN213026293U

CN213026293U - Battery pack and electric vehicle

Info

Publication number: CN213026293U
Application number: CN202020645606.1U
Authority: CN
Inventors: 孙华军; 鲁志佩; 彭青波; 万龙; 朱燕
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2021-04-20
Anticipated expiration: 2030-04-24

Abstract

A battery pack and an electric vehicle are provided, 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; at least one pole core string is arranged in at least one accommodating cavity and comprises a plurality of pole core groups which are sequentially arranged and mutually connected in series, the pole core groups are packaged in a packaging film, and the pole core strings in the accommodating cavities are electrically connected; at least one of the accommodating cavities is internally provided with an insulating heat-conducting piece, and the insulating heat-conducting piece is used for radiating heat of the battery pack. The application provides a battery package directly sets up a plurality of utmost point core groups in battery package's box, and need not to assemble into battery case earlier with utmost point core and constitute battery cell, later battery cell assembles into battery module, assembles battery module to battery package box again on, battery package simple structure, packaging efficiency is high, and volume energy density is higher, sets up insulating heat-conducting piece holding the intracavity simultaneously, can improve insulating radiating effect.

Description

Battery pack and electric vehicle

Technical Field

The utility model relates to a battery field, concretely relates to battery package and electric motor car.

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. In addition, the battery outer box body is formed by assembling and welding a plurality of edge beams and a bottom plate, a plurality of reinforcing cross beams and longitudinal beam structures are designed in the battery outer box body, the battery module is fixed on the bottom plate of the battery box body, the structure of the battery box body 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.

SUMMERY OF THE UTILITY MODEL

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; at least one pole core string is arranged in at least one accommodating cavity and comprises a plurality of pole core groups which are sequentially arranged and mutually connected in series, the pole core groups are packaged in a packaging film, and the pole core strings in the accommodating cavities are electrically connected; at least one of the accommodating cavities is provided with an insulating heat-conducting piece, and the insulating heat-conducting piece is used for insulating and radiating the pole core string.

In a second aspect of the present application, there is provided an electric vehicle including the battery pack described above.

The utility model has the advantages that: the utility model discloses set up a plurality of utmost point core groups in the box of battery package, and need not to assemble into battery cell in battery case with utmost point core equipment earlier, assemble into battery module with battery cell, end plate, curb plate etc. again, then assemble battery module to battery package box on, the battery package 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 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; the utility model discloses still set up insulating heat-conducting component holding the intracavity, can improve the insulating radiating effect of utmost point core cluster.

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 view illustrating a pole piece 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 pole piece assembly and a fixed spacer according to an embodiment of the present invention.

Fig. 4b is an exploded perspective view of a pole piece assembly and a fixed spacer according to an embodiment of the present invention.

Fig. 5 is a schematic structural view 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 view of another structure of two pole core strings connected in series in the same containing cavity according to an embodiment of the present invention.

Fig. 7 is a schematic structural view illustrating a series-parallel connection structure of two pole cores in the same accommodating cavity according to an embodiment of the present invention.

Fig. 8 is a schematic structural view 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 view illustrating a series-parallel connection structure of two pole cores in two accommodating cavities according to an embodiment of the present invention.

Fig. 10 is a schematic structural view of two pole core strings connected in series in two accommodating cavities according to an embodiment of the present invention.

Fig. 11 is a schematic structural view of two pole cores connected in series and in parallel in two accommodating cavities according to an embodiment of the present invention.

Fig. 12 is a schematic structural view of an encapsulation film encapsulated pole core set according to an embodiment of the present invention.

Fig. 13 is a schematic structural view of an encapsulation film encapsulated pole core set according to another embodiment of the present 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 present invention.

Fig. 16 is an enlarged view of a portion N in fig. 15.

Fig. 17 is a partial exploded perspective view of the insulating fixing member and the protective cover according to an embodiment of the present invention.

Fig. 18 is a schematic structural view of the case body for containing the insulating heat-conducting member according to an embodiment of the present invention.

Fig. 19 is a schematic view of a partial structure of a battery pack according to an embodiment of the present invention.

Fig. 20 is a schematic structural view of the pole core set and the insulating heat-conducting member in the first accommodating cavity according to an embodiment of the present invention.

Fig. 21 is a schematic structural view of a pole core set and an insulating heat-conducting member in a second accommodating cavity according to an embodiment of the present invention.

Fig. 22 is a schematic structural view of the pole core assembly and the insulating heat-conducting member in the third accommodating cavity according to an embodiment of the present invention.

Fig. 23 is a schematic structural view of the pole core assembly and the insulating heat-conducting member in the fourth accommodating cavity according to an embodiment of the present invention.

Detailed Description

The following description is of the preferred embodiments of the present invention, and it should be noted that, for those skilled in the art, a number of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations are also considered to be the protection scope of the present 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 those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not 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 limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1 to 3, a first embodiment of the present invention provides a battery pack 10, the battery pack 10 includes a box 100 and at least one structural beam 200 (shown in fig. 2) located in the box 100, the at least one structural beam 200 partitions the interior of the box 100 into a plurality of accommodating cavities 300; at least one accommodating cavity 300 is internally provided with at least one pole core string 401, the pole core string 401 comprises a plurality of pole core groups 400 which are sequentially arranged and are mutually connected in series, the pole core groups 400 are encapsulated in an encapsulation film 500 (as shown in fig. 12 or fig. 13), the pole core groups 400 in the accommodating cavities 300 are electrically connected, and at least one accommodating cavity 300 is internally provided with an insulating heat-conducting piece 800 (as shown in fig. 18) so as to improve the heat dissipation efficiency and the insulating effect of the pole core string 401.

As described below, the accommodating cavity is defined by the top plate 120, the bottom plate 130, the structural beam 200, and the end plate 112, or the accommodating cavity is defined by the top plate 120, the bottom plate 130, the structural beam 200, the first frame 140 (or the second frame 150), and the end plate 112, and the position of the insulating and heat-conducting member 800 is not limited, and is at least one or more of the following positions: the insulating and heat-conducting member 800 can be located between the pole core string 401 and the top plate 120, or between the pole core string 401 and the bottom plate 130, or between the pole core string 401 and the end plate 112, or between the pole core string 401 and the first frame 140, or between the pole core string 401 and the second frame 150, or between the pole core string 401 and the structural beam 200, and on one hand, the insulating and heat-conducting member 800 can perform an electrical insulation function between the pole core string 401 and the structural beam 200, the first frame 140, the second frame 150, the end plate 112, the top plate 120, and the bottom plate 130, and on the other hand, can transmit heat generated by the pole core string 401 to the structural beam 200, the first frame 140, the second frame 150, the end plate 112, the top plate 120, and the bottom plate 130, and then radiate the heat generated by the structural beam 200, the first frame 140, the second frame 150, the end plate 112, the top plate 120, and the bottom plate 130 to.

Referring to fig. 20 to 23, in a further embodiment, the height direction of the pole core assembly 400 is parallel to the first direction X; the insulating heat-conducting sheet 800 is plural, and at least one insulating heat-conducting sheet 800 is provided on the surface of the pole core group 400 in the height direction. That is, an insulating heat-conducting sheet 800 is also disposed on the surface of the pole core assembly 400 in the height direction, so that the pole core assembly 400 can better dissipate heat and is insulated from the case 100. In some embodiments, one insulating and heat-conducting member 800 is disposed on each of two opposite surfaces of the pole core assembly 400 in the height direction, so that the pole core assembly 400 can dissipate heat and insulate on four surfaces.

In some embodiments, when a plurality of pole core groups 400 are arranged in the second direction Y in the accommodating chamber 300, the two insulating and heat-conducting members 800 respectively abut the surface of the first pole core group 400 close to the structural beam 200 at one side of the accommodating chamber 300 and the surface of the last pole core group 400 close to the structural beam 200 at the other side of the accommodating chamber 300.

In other embodiments, when a plurality of pole core groups 400 are arranged in the second direction Y in the receiving cavity 300, the insulating heat-conducting member 800 may be further attached between two adjacent pole core groups 400.

In some embodiments, the insulating thermal conductor 800 is located between the structural beam and the pole core string, the structural beam has a large surface area, and the insulating thermal conductor is located between the pole core string and the structural beam, so that the heat dissipation area can be increased, and the heat dissipation efficiency is higher.

In some embodiments, the pole core string comprises two opposite surfaces in the thickness direction, at least one surface faces the structural beam, and the arrangement is such that the surface with larger pole core string area can be opposite to the structural beam, and the ester insulating heat conducting piece is arranged in the period, so that the heat conducting effect is better. In addition, insulating heat-conducting pieces can be arranged between the two surfaces in the thickness direction of the pole core string and the structural beam, and the heat dissipation effect is better.

The specific structure of the insulating and heat-conducting member 800 is not particularly limited as long as the insulating and heat-conducting effect is achieved.

In some embodiments, the insulating thermal conductive member 800 may have a plate shape, such as an insulating thermal conductive sheet. The insulating heat-conducting fin is more convenient, and it is also more convenient to maintain and change, and the setting position is also more nimble.

The insulating heat-conducting piece 800 can also be an insulating heat-conducting coating, and the specific insulating heat-conducting coating can be coated at any position of the inner wall of the accommodating cavity 300 and is provided with the insulating heat-conducting coating, so that the heat-conducting effect can be met, the space for saving the accommodating cavity 300 can be played, and the volume utilization rate of the battery box body is improved.

Insulating heat-conducting member 800 still can be for insulating heat-conducting glue, can be directly to filling and sealing heat-conducting glue in holding the chamber, not only can play insulating radiating effect after the heat-conducting glue solidification, still can play fixed utmost point core cluster 401's effect, bonds utmost point core cluster 401 and battery box 100 as a whole, improves the structural strength of whole battery package 10.

Insulating conducting strip and the laminating of the surface of utmost point core cluster 401 thickness direction, utmost point core cluster 401 is big at the superficial surface area on thickness direction, will insulate the conducting strip and the laminating of the thickness direction of utmost point core cluster 401, and heat radiating area is bigger, and the radiating effect is good. For better heat transfer effect, the insulating heat conducting sheet may be directly adhered to the surface of the pole core string 401 in the thickness direction or adhered to the inner wall of the accommodating cavity 300. The bonding method is not limited, and may be, for example, a heat conductive adhesive or a double-sided adhesive.

In some embodiments, the insulating heat conducting sheet may be a graphite sheet, a heat conducting silicone sheet, a heat conducting phase change material sheet, a heat conducting plastic sheet.

The material of the heat-conducting plastic sheet comprises one or more of polypropylene (PP), nylon (PA), Polyether Plastics (PPs) and ABS plastics.

In some embodiments, the insulating and heat-conducting adhesive may be one of epoxy AB adhesive, polyurethane heat-conducting and electric-conducting adhesive, and heat-conducting silicone grease.

In some specific embodiments, the material of the insulating and heat conducting coating may be one or more of graphene, graphite, aluminum nitride, boron nitride, aluminum oxide, silicon oxide, and silicon carbide.

The insulating and heat-conducting member 800 may be integrally formed or separately formed, and in some embodiments, the insulating and heat-conducting member includes an insulating layer 810 and a heat-conducting layer 820 that are stacked; the insulating layer may be plate-like or coated, and similarly, the thermally conductive layer 820 may be plate-like or coated.

For example, in some specific embodiments, the heat conducting layer 820 may be any one or more of a silicone heat conducting sheet, a heat conducting silicone grease, an aluminum plate, a copper plate, and a graphene film, and the insulating layer 810 may be one of an epoxy resin thin plate or an epoxy resin film.

In other embodiments, the insulating layer 810 is an insulating sheet, and the heat conducting layer 820 is a heat conducting paint coated on the insulating sheet. That is, the insulating layer 810 may be formed of an insulating sheet, and the heat conductive layer 820 may be formed of a heat conductive paint.

In other embodiments, the heat conductive layer 820 is a heat conductive sheet, and the insulating layer 810 is formed by coating insulating paint on the heat conductive sheet. That is, the heat conductive layer 820 may be formed of an insulating sheet, and the insulating layer 810 may be formed of a heat conductive paint. In some embodiments, the insulating and heat-conducting member 800 is formed by directly coating the surface of the electrode core assembly 400 in the thickness direction with a coating material having insulating and heat-conducting functions.

In some embodiments, the structural beam is provided with a heat dissipation channel, and the extension direction of the heat dissipation channel is the same as the length direction of the pole core string.

Referring to fig. 14, in a further embodiment, a heat dissipation channel 210 is provided within 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 the box 100 outside, compare with the structure roof beam 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.

The specific arrangement of the heat dissipation channel is not limited, and for example, the structural beam may be hollow inside to form the heat dissipation channel, or a heat dissipation pipe may be disposed inside the structural beam.

Further, the length of the pole core assembly 400 extends along a third direction, and the thickness of the pole core assembly 400 extends along a second direction; the surface of the pole core assembly 400 in the second direction faces the structural beam 200, and the extension direction of the heat dissipation channel 210 is the same as the third 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.

Further, the heat dissipation holes can be formed in the positions, corresponding to the heat dissipation channels 210, of the top plate 120 or the bottom plate 130 of the box body 100, the heat dissipation holes are communicated with the heat dissipation channels 210, external natural wind and other media can be introduced into the heat dissipation holes, and then the external natural wind and other media conduct a large amount of heat generated inside the pole core set 400 to the outside of the heat dissipation channels 210, so that the pole core set 400 can be guaranteed to have a large enough heat dissipation area, and the heat dissipation efficiency is improved.

In a further embodiment, the structural beam 200 includes a first side plate 220 and a second side plate 230 spaced apart along the second direction Y, the first side plate 220, the second side plate 230, the top plate 120 and the bottom plate 130 together enclosing 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 components of the case 100 and the structural beams 200 without additionally providing the heat dissipation pipe to form the heat dissipation channel 120, saving materials, and the heat dissipation channel 210 is formed in the battery pack without affecting the structural stability of the entire battery pack.

In a further embodiment, the structural beam 200 further comprises a partition 240 connected to the first side plate 220 and the second side plate 230, the partition 240 dividing 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 the present application, one or more structural beams 200 may be provided, and correspondingly, two or more accommodating cavities 300 may be provided. The number of the pole core strings 401 in each accommodation cavity 300 may be 1 or more.

The pole core strings 401 in the multiple accommodating cavities 300 are electrically connected, and any two pole core strings 401 of the accommodating cavities 300 may be electrically connected, where the electrical connection may be in series or in parallel. 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 some embodiments, a plurality of pole piece strings 401 are disposed within each receiving cavity 300. Also, the number of pole core strings 401 within each receiving cavity 300 may be the same or different. The number of pole core strings 401 in each receiving cavity 300 may be set according to actual needs, for example, 8 or 10 pole core strings 401. Of course, a plurality of pole core strings 401 may be provided in a part of the accommodating chamber 300, and only one pole core string 401 may be provided in the other part of the accommodating chamber 300.

Traditional battery package 10 is mostly to assemble the battery module with single cell, then assemble again on the battery package box, form battery package structure, the battery package 10 of this application is different from general single cell, general single cell is the apron encapsulation of packing into the battery case and passing through both ends with the utmost point core, then assemble the battery module with single cell, the end plate, the curb plate, connection piece etc. again, assemble this battery module again on the battery package box, the project organization of current battery package is complicated, the packaging efficiency is very low, spare part kind is many, spare part is with high costs, the assembly cost is also high.

In this application, set up a plurality of utmost point core group 400 in the box 100 of battery package 10, and need not to assemble into the battery cell with utmost point core earlier, assemble into battery module with battery cell, end plate, curb plate etc. again, then assemble the battery module to the battery package box on, simple structure, packaging efficiency is high. Moreover, structural members such as end plates and side plates for assembling the battery module 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, in the present application, the pole piece string 401 is directly installed in the accommodating cavity 300 of the box 100, and the pole piece strings 401 in different accommodating cavities 300 may be designed to be connected in series or in parallel. The box 100 can design the containing cavities 300 with different sizes and quantities according to different electric quantity requirements, and place the pole core strings 401 with different sizes and quantities to meet different requirements of customers. The pole core string 401 has a simple structure, and compared with a traditional single battery, the pole core string saves the structural members of an aluminum metal battery shell and a cover plate outside the pole core group, and is beneficial to improving the assembly efficiency and reducing the production cost. The pole core string 401 in the accommodating cavity 300 is simple in structure, structural members such as end plates and side plates can be saved, the weight and the cost of the structural members are saved, and the energy density of the battery pack is improved. The pole piece cluster 401 is directly integrated into the battery pack, so that the integration efficiency is greatly improved, and the assembly cost is reduced.

In this application, the pole core string 401 includes a plurality of pole core groups 400 arranged in sequence and connected in series, and at least one pole core is included in the pole core group 400. When the pole core group 400 includes more than two pole cores, the pole cores are connected in parallel. The opening of the receiving cavity 300 is a "square" opening, and in other embodiments, an "O" opening or an opening with any shape may be used.

It should be noted that the pole core group 400 includes at least one pole core, and the pole core mentioned in this application is a pole core commonly used in the field of power batteries, and the pole core group belong to a component 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 a further embodiment, the tank 100 is integrally formed with the structural beam 200.

Traditional battery pack's outer box is formed by a plurality of boundary beams and bottom plate equipment welding, some strengthening beam and longeron structure of internal design, the battery module is fixed on the bottom plate of battery box, battery box structure is more complicated, manufacturing cost is higher, traditional battery pack is installed on electric automobile, the structure of itself of battery pack is except that self satisfying mechanical safety under the prerequisite of performance alone, the structural strength of the frame of whole car still needs to protect the battery pack structure, lead to whole car cost higher, the lightweight design requirement of whole car has also been restricted to a certain extent.

The box 100 and the structural beam 200 are integrally formed in this application, for example, by an aluminum profile integral extrusion process. The structural beam 200 partitions the plurality of pole core groups within a plurality of receiving cavities 300 that form a honeycomb structure feature and have a closed structural function. The integral extrusion of the tank 100 results in high manufacturing efficiency and low cost. The structural strength and rigidity of the box body are greatly improved, and the mechanical safety and reliability are greatly improved. Meanwhile, the structural strength of the battery pack can be used as a part of the structural strength of the whole automobile, the structural strength of the whole automobile is improved, the design requirement of the whole automobile light weight of the electric automobile can be met, and the design and manufacturing cost of the whole automobile is also reduced.

In a further embodiment, the housing 100 is provided with a mounting portion 110 (shown in fig. 1), and the mounting portion 110 is used for connecting and fixing with an external load. The mounting portion 110 may be formed simultaneously with the process of integrally molding the case 100, or may be formed by drilling or the like after the case 100 is molded. In this application, installation department 110 includes installed part, rings, installation piece etc. and installation department 110 accessible bolted connection, riveting, welding etc. mode and vehicle body coupling are fixed.

The external load can be an electric vehicle or an energy storage device.

It should be noted that the case 100 of the battery pack is detachably or non-detachably connected and fixed to an external load, such as a vehicle body of an electric vehicle, through the mounting portion 110 provided thereon. The case 100 of the battery pack of the present application cannot be simply understood as a case of a battery module or a unit cell. Generally, the battery pack further includes at least one of a Battery Management System (BMS), a battery connector, a battery sampler, and a battery thermal management system.

In a further embodiment, the box 100 includes a top plate 120 and a bottom plate 130 (shown in fig. 2) oppositely disposed along a first direction X, and a first rim 140 and a second rim 150 distributed on both sides of the box 100 along a second direction Y, the at least one structural beam 200 being connected between the top plate 120 and the bottom plate 130, the first direction X being different from the second direction Y.

In other words, the case 100 includes a top plate 120 and a bottom plate 130 oppositely disposed along a first direction, and a first frame 140 and a second frame 150 oppositely disposed along a second direction, wherein the top plate 120, the first frame 140, the bottom plate 130 and the second frame 150 are connected.

The top plate 120, the first frame 140, the bottom plate 130, and the second frame 150 may be connected to each other by a direct or indirect connection method. Here, the direct connection is understood to mean that the top plate 120, the first frame 140, the bottom plate 130 and the second frame 150 together enclose an accommodating space, and the structural beam 200 is located in the accommodating space. Preferably, the top plate 120, the first frame 140, the bottom plate 130 and the second frame 150 are integrally formed, so that the box body 100 has high structural strength, and the machining is relatively simple, thereby being beneficial to reducing the production cost. Of course, the top plate 120, the first frame 140, the bottom plate 130 and the second frame 150 may be separately formed and then connected. As for the indirect connection, for example, the connection may be made through a connection plate, and the present application is not particularly limited thereto.

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 battery pack 10 box 100 can have high structural strength, the manufacturing process can be simplified, and the processing cost can be reduced.

Wherein, the two sides of the box body are positioned at the edge of the box body.

The structural beam 200 is connected to the top plate 120 and the bottom plate 130, it being understood that the structural beam 200 is integrally formed with the top plate 120 and the bottom plate 130; alternatively, the structural beam 200, the top plate 120 and the bottom plate 130 may be separately formed and then connected by a direct or indirect connection, which is not particularly limited in the present application.

In one embodiment, the tank 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 box 100 has sufficient structural strength and rigidity to satisfy the requirement of performance such as the bearing of box 100, crashproof and anti extrusion.

Specifically, the top plate 120, the bottom plate 130, and the structural beam 200 are integrally formed. In another embodiment, the bottom plate 130 is integrally formed with the structural beam 200, and then the top plate 120 is welded to the structural beam 200. Alternatively, the top plate 120 is integrally formed with the structural beam 200, and then the bottom plate 130 is welded to the structural beam 200.

In a further embodiment, a plurality of structural beams 200 are provided, the plurality of structural beams 200 are spaced apart along the second direction Y and connected between the top plate 120 and the bottom plate 130, and the length of the structural beams 200 extends along a third direction Z, which is different from the first direction X and the second direction Y.

In the present application, 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, such that the battery pack 10 case 100 is integrally formed in a honeycomb structure, and the structure has high strength and rigidity, thereby satisfying the requirements of the case 100 on properties such as load bearing, impact resistance and extrusion resistance. Moreover, the structure of the box 100 is relatively simple and the space utilization rate is high. In addition, the box body 100 and the structural beam 200 are integrally formed, and the processing technology is simple, so that the production cost is reduced. 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.

In the present application, the third direction Z is preferably perpendicular to the first direction X and the second direction Y, and in other embodiments, the third direction Z intersects the first direction X and the second direction Y, but the intersecting angle may not be equal to 90 °.

In a further embodiment, the first direction X is a height direction of the box 100, the second direction Y is a length direction of the box 100, and the third direction Z is a width direction of the box 100; alternatively, the second direction Y is a width direction of the casing 100, and the third direction Z is a length direction of the casing 100.

When the width direction of the box 100 is consistent with the width direction of the vehicle body and the length direction of the box 100 is consistent with the length direction of the vehicle body, the second direction Y is the width direction of the box 100, and the third direction Z is the length direction of the box 100; when the width direction of the box 100 coincides with the length direction of the vehicle body and the length direction of the box 100 coincides with the width direction of the vehicle body, the second direction Y is the length direction of the box 100, and the third direction Z is the width direction of the box 100. Alternatively, the first direction X is a height direction of the vehicle body, the second direction Y is a width direction of the vehicle body, and the third direction Z is a length direction of the vehicle body. In this embodiment, the second direction Y is a width direction of the case 100, and the third direction Z is a length direction of the case 100.

In an embodiment, the length of the accommodating chamber 300 in the third direction is greater than 500mm, and further, the length of the accommodating chamber 300 in the third 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 third direction is 1000mm to 2000 mm.

Further, the length of the accommodating cavity 300 along the third direction is 1300mm-2200 mm. In a further embodiment, at least one of the first frame 140 and the second frame 150 has a cavity, and a reinforcing plate 141 is disposed in the cavity, wherein the reinforcing plate 141 divides the cavity into a plurality of sub-cavities. The reinforcing plate 141 can improve the structural strength of the first frame 140 and the second frame 150, and since the first frame 140 and the second frame 150 are disposed to face each other in the second direction Y, which is the width direction of the vehicle body, and the width direction of a general vehicle body is likely to collide, the reinforcing plate 141 is provided in the first frame 140 and the second frame 150 to improve the structural strength, thereby preventing the case 100 from being damaged when the vehicle collides.

In a further embodiment, the first frame 140 and the second frame 150 are provided with mounting portions 110, and the mounting portions 110 are used for being connected and fixed with an external load.

The first frame 140 and the second frame 150 on both sides of the case 100 are provided with the mounting portions 110, so that the battery pack is mounted and fixed on the entire vehicle. Wherein the number of the mounting portions 100 may be set according to actual circumstances. In other embodiments, the mounting portion 110 may be disposed in other locations, such as 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 in the first bezel 140 penetrate the first bezel 140 in the first direction, and the mounting holes 111 provided in the second bezel 150 penetrate the second bezel 150 in the first direction. However, the axial direction of the mounting hole 111 may also be arranged at an angle to the first 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 second 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 second 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 an embodiment, as shown in fig. 1 and 2, a first opening 180 is formed at an end of the box 100 along a third direction; the battery pack 10 also includes an end plate 112 that closes the first opening 180. It can be understood that the pole core string 401 can be installed in the accommodating cavity 300 through the first opening 180, which is convenient for operation and ensures high structural strength of the case 100.

Further, both ends of the box 100 along the third direction are provided with first 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 to the box body 100 to close the corresponding first openings 180. That is, the third frame 160 and the fourth frame 170 are distributed at both ends of the case 100 along the third direction, the third frame 160 is hermetically connected with the case 100 to close the first opening 180 disposed adjacent to the third frame 160, and the fourth frame 170 is hermetically connected with the case 100 to close the first opening 180 disposed adjacent to the fourth frame 170. It can be understood that when the first openings 180 are disposed at both ends of the case 100 along the third direction, the first electrode and the second electrode (i.e., the positive electrode and the negative electrode) of the pole core string 401 located in the accommodating chamber 300 can be respectively led out from the two first openings 180.

In some embodiments, the case 100 and the third and

fourth rims

160 and 170 are made of metal and are hermetically connected by welding.

However, in other embodiments, the case 100, the third frame 160 and the fourth frame 170 may be made of plastic. Furthermore, the third frame 160 and the fourth frame 170 may be hermetically connected to the case 100 by gluing, clamping, or the like.

In some embodiments, the third frame 160 and the fourth frame 170 may be hollow like the first frame 140 and the second frame 150, and a reinforcing plate is disposed in the hollow, and the reinforcing plate divides the hollow 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 have certain strength, which is beneficial to improving the impact resistance and the extrusion resistance of the case 100 of the battery pack 10.

In an embodiment, the battery pack 10 further includes a sealing plate, wherein the end of the accommodating cavity 300 along the third direction is provided with a second opening, the sealing plate is located inside the end plate, and the sealing plate blocks a partial region of the second opening adjacent to the bottom plate, or the sealing plate completely blocks the second opening of the accommodating cavity.

In other words, the sealing plate is coupled to the structural beam 200 and the tank body 200 to close off a portion of the second opening adjacent to the bottom plate 130. That is, the half-blocking of the second 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 second openings of the accommodating cavities 300 at two ends of the accommodating cavities 300 may be that the sealing plate is hermetically connected to the first frame 140, the bottom plate 130 and the structural beam 200, or the sealing plate is hermetically connected to the second frame 150, the bottom plate 130 and the structural beam 200, so as to seal a portion of the second opening of the accommodating cavity 300, which is adjacent to the bottom plate 130.

The half-sealing of the second openings of the remaining receiving cavities 300 of the plurality of receiving cavities 300 may be performed by sealing plates that are sealingly connected to the base plate 130 and two adjacent structural beams 200 to seal a portion of the second openings of the receiving cavities 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 along the third direction is provided with a second opening, the sealing plate is located at the inner side of the end plate, and the sealing plate is hermetically connected with the structural beam 200 and the box body 100 to completely block the second opening of the receiving cavity 300. That is, the second 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 second openings of the accommodating cavities 300 at two ends of the accommodating cavities 300 may be completely sealed by sealing plates, which are hermetically connected to the first frame 140, the structural beam 200, the top plate 120, and the bottom plate 130, or by sealing plates, which are hermetically connected to the second frame 150, the structural beam 200, the top plate 120, and the bottom plate 130, so as to completely seal the second openings of the accommodating cavities 300.

The complete sealing of the second openings of the remaining receiving cavities 300 in the plurality of receiving cavities 300 may be performed by sealing plates in sealing connection with the bottom plate 130, the top plate 120 and two adjacent structural beams 200 to completely seal the second openings of the receiving cavities 300.

The sealing plate is positioned on the inner side of the end plate, namely, the sealing plate is positioned on one side of the end plate close to the inner part of the battery pack.

In a further embodiment, as shown in fig. 2 and 3, the pole piece string 401 has a length greater than 400mm, and further, the pole piece string 401 has a length of 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. The plurality of pole core groups 400 forming the pole core string 401 are sequentially arranged along a third direction, the length direction of the pole core string 401 is parallel to the third direction Z, and the third direction is the length direction or the width direction of the box body; one or more pole core strings are arranged in the same accommodating cavity.

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.

Referring to fig. 4a and 4b, in a further embodiment, the pole core group 400 includes a first electrode drawing part 410 and a second electrode drawing part 420 for drawing current, the first electrode drawing part 410 and the second electrode drawing part 420 are distributed on opposite sides of the pole core group 400 along a third direction Z, and the first electrode drawing part 410 of one pole core group 400 of two adjacent pole core groups 400 is electrically connected with the second electrode drawing part 420 of the other pole core group 400, so that the two adjacent pole core groups 400 are connected in series. 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 a further embodiment, a plurality of pole core strings 401 (as shown in fig. 2) are disposed in the same accommodating cavity 300, the plurality of pole core strings 401 are sequentially arranged and electrically connected along the thickness direction of the pole core set 400, and the thickness direction of the pole core set 400 is parallel to the second direction Y. In this way, more pole core strings 401 can be arranged in the accommodating cavity 300 to meet the requirements 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 piece strings 401 in the same housing 300 are connected in series;

the first pole-core group 400 of one pole-core string 401 in two adjacent 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.

In a further embodiment, 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 third direction Z;

the first electrode lead-out part 410 of the first pole core group 400 of one pole core string 401 in two adjacent pole core strings 401 is positioned 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.

the first electrode lead-out member 410 of the first pole-core group 400 of one pole-core string 401 of two adjacent pole-core strings 401 is located at the same side as the first electrode lead-out member 410 of the first pole-core group 400 of the other pole-core string 401, and the second electrode lead-out member 420 of the last pole-core group 400 of one pole-core string 401 of two adjacent pole-core strings 401 is located at the same side as the second electrode lead-out member 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 of electrically connecting the pole piece strings 401 of two adjacent receiving cavities 300 are specifically described 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. 8, in a further embodiment, the pole piece strings 401 in two adjacent receiving cavities 300 are connected in series.

The first pole core group 400 of one of the pole core strings 401 in one of the two adjacent 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; alternatively, the last pole-core group 400 of one of the pole-core strings 401 in one of the receiving cavities 300 of two adjacent 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.

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; 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, the step of electrically connecting a first pole core string 401 of one accommodating cavity 300 in the second direction Y with a second pole core string 401 of another accommodating cavity 300 in the second direction Y may also be included, that is, two pole core strings 401 at the nearest spacing positions in the two accommodating cavities 300 may not be electrically connected.

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 accommodating cavities 300 are respectively defined as a first accommodating cavity 300 and a second accommodating cavity 300, and one pole core string 401 disposed adjacent to the second accommodating cavity 300 in the first accommodating cavity 300 is connected in series with one pole core string 401 disposed adjacent to the first accommodating cavity 300 in the second accommodating cavity 300.

Specifically, the first pole core group 400 of one pole core string 401 disposed adjacent to the second receiving cavity 300 in the first receiving cavity 300 is electrically connected to the first pole core group 400 of one pole core string 401 disposed adjacent to the first receiving cavity 300 in the second receiving cavity 300.

Alternatively, the last pole-core group 400 of one pole-core string 401 disposed adjacent to the second receiving chamber 300 in the first receiving chamber 300 is electrically connected to the last pole-core group 400 of one pole-core string 401 disposed adjacent to the first receiving chamber 300 in the second receiving chamber 300.

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 piece strings 401 in two adjacent receiving cavities 300 are connected in parallel.

The first pole-core group 400 of one of the pole-core strings 401 in one of the adjacent two accommodation cavities 300 is electrically connected with the first pole-core group 400 of one of the pole-core strings 401 in the other accommodation cavity 300, and the last pole-core group 400 of one of the pole-core strings 401 in one of the adjacent two accommodation cavities 300 is electrically connected with the last pole-core group 400 of one of the pole-core strings 401 in the other accommodation cavity 300. 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.

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, 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. It can be understood that the wiring space of the connecting line can be saved by adopting the connecting mode.

As for the way that one pole core string 401 is arranged in each accommodating cavity 300, the way of electrically connecting the pole core strings 401 of two adjacent accommodating cavities 300 is similar to the way 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: 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; alternatively, the last pole-core group 400 of the pole-core string 401 in one receiving cavity 300 of the two adjacent receiving cavities 300 is electrically connected with the last pole-core group 400 of the pole-core string 401 in the other receiving cavity 300. 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: 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, 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. 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 third direction, and the first electrode leading-out part 410 of one pole core group 400 of two adjacent pole core groups 400 is electrically connected with the second electrode leading-out part 420 of the other pole core group 400 through a first 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 first conductive piece 440 is fixed in the fixed spacing ring 450; the pole core group main body 430 of two adjacent pole core groups 400 and the fixed space ring 450 are filled with structural adhesive, so that a plurality of pole core groups 400 can be connected into a whole through the structural adhesive, and the structural strength of the pole core string 401 can be improved, so that the pole core string 401 is installed in the accommodating cavity 300.

The fixing space ring 450 comprises a first space ring 453 and a second space ring 454 which are oppositely arranged along the second direction, the first conductive member 440 is positioned 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 first conductive member 440 so as to avoid the play between the pole core groups 400.

In the present embodiment, a plug pin 451 is provided on a surface of one of the first space ring 453 and the second space ring 454 facing the first conductive member 440, an insertion hole 452 is provided on the other of the first space ring 453 and the second space ring 454, and the first space ring 453 and the second space ring 454 are inserted into the insertion hole 452 through the plug pin 451 to be fixedly connected, and the first conductive member 440 is sandwiched therebetween.

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; the encapsulation film 500 is formed with encapsulation parts at positions opposite to the first electrode drawing part 410 and/or the second electrode drawing part 420 to isolate the adjacent two-pole core pack 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 assemblies 400 is encapsulated in an encapsulation film 500 to form pole-core assemblies 400, and the pole-core assemblies 400 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 may be individually encapsulated outside each pole core group 400, and then the pole core groups 400 are connected in series.

In a further embodiment, the air pressure of the receiving chamber 300 is lower than the air pressure outside the case 100. The accessible is to holding chamber 300 inside vacuum pumping, and makes the atmospheric pressure that holds chamber 300 be less than the outer atmospheric pressure of box 100, holds chamber 300 evacuation back, can reduce the stock of materials such as steam, oxygen in the box 100, avoids steam, oxygen to the long-time ageing of utmost point core group and each spare part in the box, improves the inside utmost point core group of box or the life of each spare part.

In a further embodiment, the chamber 100 is provided with a pumping 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.

Referring to fig. 2, in a further embodiment, a plurality of pumping holes 190 are formed in the box 100, and the plurality of pumping holes 190 are respectively and correspondingly communicated with the plurality of accommodating cavities 300. That is, each receiving chamber 300 can be evacuated through the corresponding evacuation hole 190. For example, when the number of the accommodating chambers is 14, the number of the pumping holes 190 is also 14.

In some embodiments, the plurality of receiving chambers 300 are communicated with each other, and the box 100 is provided with at least one pumping hole communicated with the receiving chambers 300. That is, 1 or more of the case 100 may be provided. For example, when the number of the air suction holes 190 is 1, since the plurality of accommodating chambers 300 are communicated with each other, the entire accommodating chambers 300 in the case can be evacuated only when the air suction holes 190 are air-sucked.

When there are a plurality of pumping holes, for example, 3 pumping holes 190 may be uniformly disposed on the box 100, and 3 pumping holes 190 may be pumped simultaneously, so as to increase the speed of pumping vacuum. In other embodiments, the number of the air exhaust holes can be set according to actual needs.

In a further embodiment, the structural beam 200 is provided with a through hole to communicate two adjacent accommodating cavities 300. Alternatively, in some embodiments, the end of the structural beam 200 in the third direction is provided with a recess 250 (as shown in fig. 16) recessed away from the third rim 160 or the fourth rim 170, and two adjacent receiving cavities 300 are communicated through the recess 250.

In a further embodiment, the case 100 is provided with glue injection holes 1010 (shown in fig. 1) communicating with the accommodating cavities 300, each accommodating cavity corresponds to at least one glue injection hole 1010, and the glue injection holes 1010 are used for filling glue into the corresponding accommodating cavity 300, so as to fixedly connect the pole core assembly 400 and the case 100. Wherein a portion of the glue injection hole 1010 is shown in figure 1. The pole core assembly 400, the case 100 and the structural beam 200 may be fixedly connected together in a potting manner using a hollow glass bead filling adhesive or a structural adhesive, thereby further improving the structural strength of the battery pack 10.

In a further embodiment, two adjacent pole core groups 400 forming a pole core string 401 are electrically connected through a first conductive member 440, and the glue injection holes are arranged corresponding to the first 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 (not shown) for collecting information about the pole core pack 400 so as to facilitate understanding of the current operating conditions of the pole core pack 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. 15 to 17, in a further embodiment, the end portions of the accommodating cavities along the third direction are provided with second openings, and the two polar core groups 400 located at the same side and adjacent to the second openings in two adjacent accommodating cavities 300 are electrically connected through a second conductive member 460. That is, the first pole core group 400 of one receiving chamber 300 of the adjacent two receiving chambers 300 is electrically connected with the first pole core group 400 of the other receiving chamber 300 through the second conductive member 460, or the last pole core group 400 of one receiving chamber 300 of the adjacent two receiving chambers 300 is electrically connected with the last pole core group 400 of the other receiving chamber 300 through the second conductive member 460.

In a further embodiment, an insulating fixing member 600 is disposed at the second opening, the second conductive member 460 is fixed on the insulating fixing member 600, and the insulating fixing member 600 can perform fixing, supporting and insulating functions on the second conductive member 460.

In an embodiment, two ends of the accommodating cavity 300 along the third direction are provided with second openings, and two insulating fixing members 600 are provided and are disposed at the corresponding second openings.

In a further embodiment, the second conducting member 460 is disposed on one side of the insulating fixing member 600 far away from the pole core group 400, the pole core group 400 includes 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 two opposite sides of the pole core group 400 along a third direction, the first electrode leading-out part 410 of one pole core group 400 and the first electrode leading-out part 410 of the other pole core group 400 in two adjacent accommodating cavities 300, which are located on the same side and adjacent to the second opening, penetrate through the insulating fixing member 600 and are electrically connected through the second conducting member 460, so as to realize parallel connection of the pole core groups 400 in the two adjacent accommodating cavities 300, and the connection path of the connection manner is relatively short, which is beneficial to reducing internal resistance.

In another embodiment, the second electrode drawing part 420 of one pole core group 400 of the two pole core groups 400 located at the same side and adjacent to the second opening in two adjacent accommodating cavities 300 and the second electrode drawing part 420 of the other pole core group 400 penetrate through the insulating fixing member 600 and are electrically connected through the second conductive member 460, so that the pole core groups 400 of two adjacent accommodating cavities 300 are connected in parallel, and the connection path of the connection manner is relatively short, which is beneficial to reducing the internal resistance.

In another embodiment, the first electrode drawing part 410 of one pole core group 400 and the second electrode drawing part 420 of the other pole core group 400 in the two adjacent accommodating cavities 300, which are located on the same side and adjacent to the second opening, penetrate through the insulating fixing member 600 and are electrically connected through the second conductive member 460, so that the pole core groups 400 of the two adjacent accommodating cavities 300 are connected in series, and the connection path of the connection manner is relatively short, which is beneficial to reducing the internal resistance.

In a further embodiment, a fixing hole is formed on the second conductive member 460, a fixing portion is formed on a side of the insulating fixing member 600 away from the pole core set, and the fixing portion is fixed in the fixing hole, so that the second conductive member 460 is fixed on the insulating fixing member 600. Of course, in other embodiments, the second conductive member 460 may also be fixed to the side of the insulating fixing member 600 far away from the pole core set 400 by gluing.

In a further embodiment, the insulating fixing member 600 is provided with a clamping portion 620 (as shown in fig. 16) at two sides along the first direction, and the insulating fixing member 600 is clamped and fixed with the structural beam 200 by the clamping portion 620. Thereby connecting and fixing the insulating fixture 600 to the case 200.

Specifically, joint portion 620 sets up along first direction X relatively, and joint portion 620 is equipped with a plurality ofly, and a plurality of joint portions 620 arrange along second direction Y, 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 second direction Y.

In a further embodiment, the end of the structural beam 200 is provided with an extension portion 260 oppositely arranged along the first direction, the structural beam 200 and the extension portion 260 enclose a recess 250, and the insulating fixing member 600 is fastened with the extension portion 260 through the fastening portion 620 to be fixed in the recess 250.

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 second direction, the extending portion 260 corresponds to two oppositely disposed side plate extending portions, and the fastening portion 620 is provided with two grooves 621, and the two oppositely disposed side plate extending portions are respectively fastened in the two grooves 621. In other embodiments, a groove is formed in the extending portion 260, the latching portion 620 is a latch, and the latch 620 is engaged in the groove 261.

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 case 100 along the third direction, one protective cover 700 is located inside the third frame 160, and the other protective cover 700 is located inside the fourth frame 170. In a further embodiment, two sides of the protective cover 700 along the first direction are provided with flanged portions 710 (as shown in fig. 15 and 17) 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 provided on two opposite sides of the second conductive member 460 along the first direction, 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.

In a further embodiment, a hook 631 is disposed on a side of the connecting portion 630 away from the second conductive member 460, a slot 711 is disposed on the flanged portion 710, and the hook 631 is clamped 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 slot, and one side of the flanged portion 710 close to the accommodating cavity 300 is provided with a hook, and the hook is locked in the locking slot, so that the protective cover 700 is fixedly connected with the insulating fixing member 600.

In a further embodiment, heat dissipating through holes (not shown) are provided in the protective cover 700. The heat dissipation channel may further dissipate heat from the inside of the case 100.

Referring to fig. 18, in a further embodiment, an insulating heat-conducting member 800 is disposed in the accommodating chamber 300.

In an embodiment, the insulating thermal conductive member 800 is an insulating thermal conductive sheet, the insulating thermal conductive sheet is attached to the surface of the pole core set 400 in the thickness direction, and the thickness direction of the pole core set 400 is the second direction Y, that is, the surface of the pole core set 400 corresponding to the thickness direction and having the largest area is attached to the insulating thermal conductive sheet, so that the insulating thermal conductive effect can be improved.

In another embodiment, the insulating thermal conduction member 800 is an insulating thermal conduction coating disposed on the inner wall of the receiving cavity 300.

Referring to fig. 19, in a further embodiment, the pole core assembly 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 assembly 400 along a third direction Z; a plurality of pole core groups 400 in the same accommodation chamber 300 are arranged in the third direction Z;

the plurality of receiving cavities 300 are arranged in the second direction Y, and the first electrode drawing part 410a of the first electrode core group 400 in the first receiving cavity 300 arranged in the second direction Y among the plurality of receiving cavities 300 and the second electrode drawing part 420a of the first electrode core group 400 in the last receiving cavity 300 are positioned at the same side of the case 100; the first electrode lead-out part 410a may be a positive electrode, the second electrode lead-out part 420a may be a negative electrode, the leading-out directions of the positive and negative electrode currents of the whole battery pack 10 are on the same side, for example, both are on the side of the case 100 corresponding to the first electrode core group 400, and the first electrode lead-out part 410a and the second electrode lead-out part 420a on the same side are more convenient for being connected to external devices, for example, to electronic devices of a vehicle.

In other embodiments, the plurality of receiving cavities 300 are arranged in the second direction Y, and the second electrode drawing part 420 of the last pole core group 400 in the first receiving cavity 300 of the plurality of receiving cavities 300 arranged in the second direction Y and the first electrode drawing part 410 of the last pole core group 400 in the last receiving cavity 300 are located at the same side of the case. That is, the direction of the current drawn from the positive and negative electrodes of the entire battery pack 10 is on the side of the case 100 corresponding to the last electrode core group 400.

In some embodiments, the plurality of accommodating chambers 300 are arranged along the second direction Y to form accommodating chamber groups 301, and at least two accommodating chamber groups 301 are arranged along the first direction X; the first direction X is a height direction of the casing 100, and the second direction Y is a width direction of the casing 100 or the second direction Y is a length direction of the casing 100. That is, the housing 100 simultaneously forms the receiving chamber group 301 having a plurality of layers in the integrally forming process, and the structural beams 200 are arranged in the second direction Y and the first direction X to intersect. The case 100 of this embodiment can accommodate more pole core sets, which can increase the capacity of the battery.

Referring to fig. 19, in a further embodiment, the box 100 includes a top plate 120 and a bottom plate 130 oppositely disposed along a first direction, the first direction is a height direction of the box, a plurality of pole core groups 400 constituting a pole core string 401 are sequentially arranged along a third direction and are connected in series, a length direction of the pole core string 401 extends along the third direction, and the third direction is a width direction or a length direction of the box;

the battery pack 10 further includes a first total electrode 410a and a second total electrode 420a for drawing out current, and the first total electrode 410a and the second total electrode 420a are located on the same side of the case 100 along the third direction. Further, the first and second

total electrodes

410a and 420a may be drawn from the third bezel 160 or the fourth bezel 170.

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 opposite sides of the pole core group 400 along a third direction; a plurality of pole core groups 400 constituting the pole core string in the accommodation cavity 300 are arranged in the third direction and connected in series;

the plurality of receiving cavities 300 are arranged in the second direction, and the first electrode drawing part 410 of the first pole core group 400 in the first receiving cavity 300 arranged in the second 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 100; 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 pole core group 400 in the first accommodation cavity 300 arranged in the second direction among the plurality of accommodation cavities 300 and the first electrode drawing part 410 of the last pole 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

The box body 100 further comprises a first frame 140 and a second frame 150 distributed at two sides of the box body 100 along the second direction, the number of the structural beams 200 is multiple, the structural beams 200 are distributed at intervals along the second direction, the length of the structural beam 200 extends along the third direction, the structural beams 200 are connected to the top plate 120 and the bottom plate 130, and the box body 100 and the structural beams are integrally formed; both ends of the box body 100 along the third direction are provided with first openings 180; the battery pack 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 case 100 to close the corresponding first openings 180.

Through the technical scheme, the pole core groups 400 are packaged in the packaging film 500, the pole core groups 400 are connected in series to form the pole core strings 401, and the pole core strings 401 are arranged in the box body 100 of the battery pack 10, so that double sealing is realized through the packaging film 500 and the box body 100 of the battery pack 10, and the sealing effect is improved; in addition, the pole core string 401 adopted by the present application omits the fixing structures (such as the end plate 112, the side plate, the fastener, etc.) of the battery shell and the battery module in the prior art, so that the space utilization rate of the battery pack 10 can be improved, the weight of the battery pack 10 can be reduced, and the energy density of the battery pack 10 can be improved, and the battery pack 10 of the present application has a simple structure and high assembly efficiency, and is beneficial to reducing the production cost; furthermore, in the case 100 of the battery pack 10 of the present application, 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, which has high strength and rigidity, thereby meeting the requirements of the case 100 of the battery pack 10 on properties such as load bearing, impact resistance, and extrusion resistance. In addition, the case 100 of the battery pack 10 of the present application has a relatively simple structure, a relatively low manufacturing cost, and a relatively high space utilization rate. In addition, the structural beam 200 divides the box body 100 into a plurality of accommodating cavities 300, and when a thermal runaway occurs to a cell 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.

Referring to fig. 20, in a further embodiment, a plurality of pumping holes 190 are formed in the box 100, and the plurality of pumping holes 190 are respectively and correspondingly communicated with the plurality of accommodating cavities 300. That is, each receiving chamber 300 can be evacuated through the corresponding evacuation hole 190. For example, when the number of the accommodating chambers is 14, the number of the pumping holes 190 is also 14.

In some embodiments, the plurality of receiving chambers 300 are communicated with each other, and the box 100 is provided with at least one pumping hole communicated with the receiving chambers 300. That is, 1 or more of the case 100 may be provided. For example, when the number of the air suction holes 190 is 1, since the plurality of accommodating chambers 300 are communicated with each other, the entire accommodating chambers 300 in the case can be evacuated only when the air suction holes 190 are air-sucked. In fig. 2, it is shown that the ceiling 120 corresponding to the most lateral one of the receiving chambers 300 is provided with a suction hole 190. In other embodiments, the single pumping hole 190 may be disposed at other positions of the chamber 100.

Referring to fig. 20 again, in a further embodiment, the box 100 includes a top plate 120 and a bottom plate 130 oppositely disposed along a first direction X, and a first frame 140 and a second frame 150 distributed at two sides of the box 100 along a second direction; the pumping holes 190 are provided on the top plate 120 and/or the bottom plate 130. In the present embodiment, the air exhaust holes 190 are disposed on the top plate 120, and in order to avoid the influence of the close distance between the air exhaust holes 190 on the structural strength of the top plate 120, the air exhaust holes 190 may be uniformly distributed on the top plate 120, and in fig. 20, for the sake of clearly showing the position of each receiving cavity 300, the dashed line is correspondingly disposed on the top plate 120 corresponding to each receiving cavity 300. In other embodiments, a single suction hole 190 may be formed in the top plate 120 corresponding to the spaced apart receiving chambers 300, and a single suction hole 190 may be formed in the bottom plate 130 corresponding to the remaining spaced apart receiving chambers 300.

Referring to fig. 1, in some embodiments, the battery pack 10 further includes a third frame 160 and a fourth frame 170 distributed at two ends of the case 100 along a third direction of the case 100, the case 100 is provided with first openings 180 at two ends along the third direction, and the third frame 160 and the fourth frame 170 are hermetically connected with the case 100 to close the corresponding first openings 180; the third direction is parallel to the extending direction of the structural beam 200; the number of the pumping holes 190 is one, and the pumping holes 190 are formed on the third frame 160 or the fourth frame 170. In this embodiment, the pumping holes 190 are formed on the third frame 160.

The utility model also provides an electric vehicle, including foretell battery package. The application provides an electric motor car, when installing whole car through the battery package that is higher with above-mentioned structural strength, can promote the structural strength of whole car, need not additionally to set up additional strengthening on whole car like this, and then be favorable to realizing the light-weighted designing requirement of whole car of electric motor car, also reduce the design and the manufacturing cost of whole car simultaneously.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

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; at least one pole core string is arranged in at least one accommodating cavity and comprises a plurality of pole core groups which are sequentially arranged and mutually connected in series, the pole core groups are packaged in a packaging film, and the pole core strings in the accommodating cavities are electrically connected; at least one of the accommodating cavities is provided with an insulating heat-conducting piece, and the insulating heat-conducting piece is used for insulating and radiating the pole core string.

2. The battery pack of claim 1, wherein the insulative, thermally conductive member is disposed between the pole core string and the structural beam.

3. The battery pack of claim 2, wherein the pole piece string includes two opposing surfaces in a thickness direction, at least one of the surfaces facing the structural beam.

4. The battery pack according to claim 1, wherein the insulating heat-conducting member is at least one of an insulating heat-conducting sheet, an insulating heat-conducting coating, or an insulating heat-conducting adhesive.

5. The battery pack according to claim 4, wherein the insulating heat-conducting sheet is bonded to the surface of the pole core string or the inner wall of the housing cavity, or wherein the insulating heat-conducting coating is coated on the inner wall of the housing cavity.

6. The battery pack according to claim 5, wherein the insulating heat-conductive sheet is bonded to at least one of two opposite surfaces of the pole core string in the thickness direction.

7. The battery pack of claim 5, wherein the insulating thermally conductive sheet comprises one or more of a graphite sheet, a thermally conductive silicone sheet, a thermally conductive phase change material sheet, and a thermally conductive plastic sheet.

8. The battery pack of claim 1, wherein the insulating and thermally conductive member comprises an insulating layer and a thermally conductive layer disposed in a stack.

9. The battery pack of claim 8, wherein the insulating layer comprises one of an epoxy laminate or an epoxy film; the heat conduction layer comprises any one or more of a silica gel heat conduction sheet, heat conduction silicone grease, an aluminum plate, a copper plate and a graphene film.

10. The battery pack of any one of claims 1-9, wherein the structural beam has a heat sink channel therein; the extending direction of the heat dissipation channel is the same as the length direction of the pole core string.

11. The battery pack of claim 10, wherein the case includes a top plate and a bottom plate disposed opposite each other along a first direction, the structural beam includes a first side plate and a second side plate disposed at an interval along a second direction, and the first side plate, the second side plate, the top plate, and the bottom plate together enclose the heat dissipation channel; the first direction is different from the second direction.

12. The battery pack of claim 1, wherein the case is integrally formed with the structural beam; the box body is provided with an installation part, and the installation part is used for being connected and fixed with an external load.

13. The battery pack of claim 1, wherein the case includes a top plate and a bottom plate disposed opposite to each other along a first direction, and a first rim and a second rim disposed at both sides of the case along a second direction;

the plurality of structural beams are distributed at intervals along a second direction and connected between the top plate and the bottom plate, and the length of each structural beam extends along a third direction;

the first direction is the height direction of the box body, the second direction is the width direction of the box body, and the third direction is the length direction of the box body; or, the second direction is the length direction of the box body, and the third direction is the width direction of the box body.

14. The battery pack of claim 13, wherein the first frame and the second frame define a cavity therein, and wherein a reinforcing plate is disposed within the cavity and divides the cavity into a plurality of sub-cavities.

15. The battery pack according to claim 13, wherein an end of the case in the third direction is provided with a first opening; the battery pack also includes an end plate that closes the first opening.

16. The battery pack according to claim 15, further comprising a sealing plate located inside the end plate, wherein the end of the receiving cavity in the third direction is provided with a second opening, and wherein the sealing plate blocks a partial region of the second opening adjacent to the bottom plate, or wherein the sealing plate completely blocks the second opening of the receiving cavity.

17. The battery pack according to claim 1, wherein the accommodating cavity has a length of more than 500mm, the pole core string has a length of more than 400mm, a plurality of pole core groups constituting the pole core string are sequentially arranged along a third direction, the length direction of the pole core string is parallel to the third direction, and the third direction is the length direction or the width direction of the case; one or more pole core strings are arranged in the same accommodating cavity.

18. The battery pack according to claim 17, wherein a plurality of pole core strings are disposed in the same accommodating cavity, the plurality of pole core strings are sequentially arranged in the thickness direction of the pole core group and are electrically connected, the thickness direction of the pole core group is parallel to a second direction, the second direction is the length direction of the case, and the third direction is the width direction of the case; or the second direction is the width direction of the box body, and the third direction is the length direction of the box body.

19. The battery pack of claim 18, 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, and the first electrode leading-out part of the first pole core group of one pole core string in two adjacent pole core strings and the second electrode leading-out part of the first pole core group of the other pole core string are positioned on the same side;

or 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, 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 first electrode leading-out part of the last pole core group of the other pole core string are positioned on the same side.

20. The battery pack of claim 18, 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 two adjacent pole core strings is electrically connected with the first pole core group of the other pole core string, and the first electrode leading-out part of the first pole core group of one pole core string in 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 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, and the second electrode leading-out component 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 component of the last pole core group of the other pole core string are positioned on the same side.

21. The battery pack of claim 18, wherein the pole piece strings in adjacent two receiving cavities are connected in series;

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, and 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 is positioned on the same side as the second electrode leading-out part of the first pole core group of one of the pole core strings in the other accommodating cavity;

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, and the first 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 is positioned on the same side as the second electrode leading-out part of the last pole core group of one of the pole core strings in the other accommodating cavity.

22. The battery pack according to claim 18, wherein the pole pieces in adjacent two receiving cavities are connected in series and 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, and 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 is positioned on the same side as the first electrode leading-out part of the first pole core group of one of the pole core strings in the other accommodating cavity;

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, 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 is positioned on the same side as the second electrode leading-out part of the last pole core group of one of the pole core strings in the other accommodating cavity.

23. The battery pack according to claim 1, wherein the plurality of pole core groups constituting the pole core string are arranged in a third direction, the pole core group includes a pole core group main body and a first electrode lead-out member and a second electrode lead-out member for leading out current, the first electrode lead-out member and the second electrode lead-out member are distributed on opposite sides of the pole core group main body in the third direction, and the first electrode lead-out member of one of the two adjacent pole core groups is electrically connected with the second electrode lead-out member of the other pole core group through a first conductive member;

be equipped with fixed space ring between the utmost point core group main part of two adjacent utmost point core groups, first electrically conductive piece is fixed in the fixed space ring, the third direction is the length direction or the width direction of box.

24. 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, and a first electrode leading-out part and a second electrode leading-out part which are electrically connected with the pole core group main body and used for leading out current, wherein the joint of the first electrode leading-out part of one of the two pole core groups connected in series and the second electrode leading-out part of the other pole core group is positioned in the encapsulation film.

25. 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.

26. The battery pack of claim 11, wherein the structural beam further comprises a separator connected to the first and second side plates, the separator dividing the heat dissipation channel into a plurality of sub-channels.

27. The battery pack according to claim 15, wherein the case body is provided at both ends thereof in a third direction with first openings, the end plate includes third and fourth rims that are sealingly coupled to the case body to close the corresponding first openings, and the third direction is a length direction or a width direction of the case body.

28. The battery pack of claim 27, wherein the case, the third frame, and the fourth frame are made of metal and are hermetically connected by welding.

29. The battery pack according to claim 17, wherein the electrode core groups include first and second electrode drawing parts for drawing current, the first and second electrode drawing parts are distributed at opposite sides of the electrode core groups in a third direction, and the first electrode drawing part of one of the adjacent two electrode core groups is electrically connected to the second electrode drawing part of the other electrode core group.

30. The battery pack according to claim 23, wherein a structural adhesive is filled between the pole core group main bodies of the adjacent two pole core groups and the fixing space ring.

31. The battery pack according to claim 23, wherein the fixed space ring includes a first space ring and a second space ring that are disposed opposite to each other in a second direction, the first conductive member is located between the first space ring and the second space ring, the first space ring and the second space ring are connected to sandwich and fix the first conductive member, and the second direction is different from the third direction.

32. The battery pack according to claim 24, wherein the encapsulation film is formed with encapsulation parts to isolate the adjacent two polar core pack bodies at positions opposite to the first electrode lead-out member and/or the second electrode lead-out member.

33. The battery pack of claim 32, wherein at least one of the first electrode lead-out member of one of the adjacent two electrode core groups and the second electrode lead-out member of the other electrode core group is located in the encapsulation part.

34. An electric vehicle comprising the battery pack according to any one of claims 1 to 33.