CN113782901A

CN113782901A - Battery pack and electric vehicle

Info

Publication number: CN113782901A
Application number: CN202010443582.6A
Authority: CN
Inventors: 胡世超; 彭青波; 王晓鹏; 朱建华; 鲁志佩; 孙华军
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2021-12-10
Anticipated expiration: 2040-05-22
Also published as: CN113782901B

Abstract

The application provides a battery pack and an electric vehicle, the battery pack comprises a box body and a plurality of pole core strings which are positioned in the box body and are electrically connected with each other, the box body comprises at least one sub-box body, the at least one sub-box body is connected to form a box body of the box body, the opening has been seted up along the tip of second direction to the case body, the box is still including sealing open-ended end plate, every the opening corresponds at least one the end plate, the sub-box body includes at least one structure roof beam and follows roof and the bottom plate that the first direction set up relatively, at least one the structure roof beam will case body internal partitioning becomes a plurality of chambeies that hold, at least one it is equipped with at least one to hold the intracavity the utmost point core cluster, the battery package of this application has higher structural strength and higher space utilization, the design that adopts a plurality of end plates is convenient for later stage dismouting maintenance.

Description

Battery pack and electric vehicle

Technical Field

The application relates to the field of batteries, in particular to a battery pack and an electric vehicle.

Background

The traditional battery pack comprises a box body and a battery module arranged in the box body, the box body of the battery pack comprises a tray and an upper cover connected with the tray, the battery module is fixed on the tray, when the battery pack is assembled, a plurality of batteries are generally arranged in sequence to form a battery pack, then integrated end plates are arranged at two ends of the length direction of the battery pack, side plates are arranged at two sides of the width direction of the battery pack, and the end plates and the side plates are fixedly connected through bolts or pull rods or welding to form the battery module; and finally, mounting the battery module in the tray through fasteners such as bolts and the like.

Above-mentioned battery package adopts the end plate design of integral type, when battery package inside some breaks down, need dismantle whole end plate, could detect maintenance and change, because the end plate is inseparabler with being connected of battery package body, consequently, the dismantlement of end plate is more difficult, when battery package some breaks down, dismantle whole end plate, the part that does not break down will also expose, various collisions or foreign matter entering appear in the maintenance process and lead to the part that does not break down originally in the battery package also can new gross disease appear, and dismantlement many times and installation can lead to end plate and battery package body coupling inseparable, cause new safety problem easily.

Disclosure of Invention

The present disclosure is directed to solving at least one of the problems of the prior art, and to this end, in one aspect, a battery pack includes a case and a plurality of pole core strings electrically connected to each other in the case;

the box body comprises at least one sub-box body, the at least one sub-box body is connected to form a box body of the box body, at least one end part of the sub-box body along a second direction is provided with an opening, the box body further comprises an end plate for closing the opening, and the second direction is the width direction of the box body or the length direction of the box body;

wherein, when the box body comprises a plurality of sub box bodies, each opening corresponds to a plurality of end plates, and when the box body comprises a plurality of sub box bodies, each opening corresponds to at least one end plate;

the sub-box body comprises at least one structural beam, a top plate and a bottom plate which are oppositely arranged along a first direction, the first direction is the height direction of the box body, the structural beam is positioned between the top plate and the bottom plate, at least one structural beam is connected to the top plate and the bottom plate, the interior of the box body is divided into a plurality of accommodating cavities by the at least one structural beam, and at least one pole core string is arranged in the at least one accommodating cavity;

the pole core string comprises a plurality of pole core groups which are sequentially arranged along a second direction and are connected in series; the pole core group is packaged in a packaging film; the length direction of the pole core string extends along a second direction; the second direction is the width direction of the box body or the second direction is the length direction of the box body;

the box body is provided with an installation part, and the installation part is used for being connected and fixed with an external load.

This application on the other hand provides an electric motor car, including automobile body and foretell battery package, the battery package passes through the installation department is fixed in on the automobile body.

The beneficial effect of this application: the battery package includes an at least subbox and a plurality of end plate in this application, can select the quantity of subbox and end plate according to the actual demand in addition, and at least one subbox body coupling constitutes the case body, and every subbox body is equipped with the opening along at least one tip of second direction, the end plate is used for sealing the opening, every opening correspond at least one end plate, has both increased the flexibility and the general type of battery package design like this, also make things convenient for the later stage to dismantle the maintenance simultaneously, when a certain regional problem appearing in the battery package of later stage, the regional position of accessible external detection judgement problem, then dismantle down and correspond regional end plate to, thereby maintain the change to battery package inside, avoided dismantling more spare parts, also avoided exposing more positions in the battery package outside, promoted the security of maintenance change. In addition, the pole core groups are packaged in the packaging film, the pole core groups are connected in series to form the pole core strings, and the pole core strings are arranged in the box body of the battery pack, so that double-layer sealing is realized through the packaging film and the box body of the battery pack, and the sealing effect is improved; moreover, the pole piece cluster that this application adopted, it has saved the fixed knot structure (for example end plate, curb plate and fastener etc.) of battery box and battery module among the prior art to can improve the space utilization of battery package, alleviate the weight of battery package, improve the energy density of battery package.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure;

fig. 2 is an exploded view of a battery pack according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a box provided in an embodiment of the present application;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is an exploded view of a housing provided in accordance with an embodiment of the present application;

fig. 6 is an exploded view of a partial structure of a battery pack according to an embodiment of the present disclosure;

fig. 7 is an exploded view of a portion of another battery pack provided in an embodiment of the present application;

fig. 8 is a schematic structural diagram of a pole piece string according to an embodiment of the present application;

fig. 9 is a schematic structural view illustrating a connection between a pole core assembly and a fixed spacer according to an embodiment of the present application;

FIG. 10 is an exploded view of FIG. 9;

fig. 11 is a schematic structural diagram of two pole core strings connected in series in the same accommodating cavity according to an embodiment of the present application;

fig. 12 is a schematic structural view of two pole core strings connected in series in the same containing cavity according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of two pole cores connected in series and in parallel in the same accommodating cavity according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of two pole core strings connected in series in two accommodating cavities according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of two pole cores connected in series and in parallel in two accommodating cavities according to an embodiment of the present application;

fig. 16 is a schematic structural view of two pole core strings connected in series in two accommodating cavities according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of two pole cores in series-parallel connection in two accommodating cavities according to an embodiment of the present application;

fig. 18 is a schematic structural diagram of an encapsulating film encapsulating a pole core group according to an embodiment of the present application;

fig. 19 is a schematic structural diagram of an encapsulating film encapsulating a pole core group according to another embodiment of the present application;

fig. 20 is a schematic structural diagram of a second explosion-proof valve according to an embodiment of the present application.

Reference numerals:

10. a battery pack;

100. a box body; 101. a sub-box body; 102. a top plate; 103. a base plate; 104. an installation part; 105. mounting holes; 106. a first edge beam; 107. a second edge beam; 108. a partition plate; 109. a connecting plate; 110. an opening; 111. an end plate; 112. injecting glue holes; 113. a tank body;

200. a structural beam;

300. an accommodating chamber;

400. a pole core group; 401. a pole piece string; 410. a first electrode lead-out member; 420. a second electrode lead-out member; 430. a pole core assembly body; 440. a first conductive member; 450. fixing a space ring; 451. a bolt; 452. a jack; 453. a first space ring; 454. a second space ring; 460. a second conductive member;

500. packaging the film; 510. a packaging section;

600. an insulating support;

700. an insulating protective cover;

800. a second explosion-proof valve; 801. a boss portion; 802. a cover body; 803. a region of weakness; 804. a first explosion-proof valve;

900. and (4) cooling the part in a liquid manner.

Detailed Description

The following is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications are also considered as the protection scope of the present application.

In the description of the present application, 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, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

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, and in the description of this application, "plurality" means two or more unless specifically defined otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate medium, and may be communicated with each other inside the two elements or the interaction relationship between the two elements, and the specific meaning of the terms in the present application may be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 4, a battery pack 10 according to a first embodiment of the present disclosure includes a case 100 and a plurality of pole core strings 401 electrically connected to each other in the case 100. The casing 100 is provided with a mounting portion 104, and the mounting portion 104 is used for connection and fixation with an external load. The box body 100 comprises at least one sub-box body 101, the at least one sub-box body 101 is connected to form a box body 113 of the box body 100, at least one end of the sub-box body 101 along the second direction is provided with an opening 110, and the box body 100 further comprises an end plate 111 for closing the opening 110; when the box 100 comprises one sub-box 101, each opening 110 corresponds to a plurality of end plates 111, that is, when the box 100 only comprises one sub-box 101, the opening 110 at each end of the sub-box 101 is closed by a plurality of end plates 111; when the box 100 includes a plurality of sub-boxes 101, each opening 110 corresponds to at least one end plate 111, that is, when there are a plurality of sub-boxes 101, each opening of each sub-box 101 may be correspondingly sealed by using one end plate 111, at this time, for the whole box 100, the end plate 111 at the second direction agreeing end is provided with a plurality of ends, when maintenance needs to be performed on components inside one of the sub-boxes 101, only the end plate corresponding to the sub-box 101 needs to be detached, and it can be understood that, when there are a plurality of sub-boxes 101, each opening 110 of each sub-box may be sealed by using a plurality of end plates 111.

The sub-box body 101 comprises at least one structural beam 200 and a top plate 102 and a bottom plate 103 which are oppositely arranged along a first direction, the structural beam 200 is positioned between the top plate 102 and the bottom plate 103, the at least one structural beam 200 is connected with the top plate 102 and the bottom plate 103, the at least one structural beam 200 divides the interior of the sub-box body 101 into a plurality of accommodating cavities 300, and at least one pole core string 401 is arranged in the at least one accommodating cavity 300; the pole core string 401 comprises a plurality of pole core groups 400 which are sequentially arranged along a second direction and are connected in series, the pole core groups 400 are packaged in the packaging mold 500, and the length of the pole core string 401 extends along the second direction; the first direction is a height direction of the box 100, and the second direction is a length direction of the box 100 or a width direction of the box 100.

Traditional battery package adopts the end plate design of integral type, when battery package inside some breaks down, needs to dismantle whole end plate get off, just can detect maintenance and change, needs to spend the more time dismouting.

In the present application, the case 100 of the battery pack 10 includes at least one sub-case 101, the at least one sub-case 101 is connected to form a case body 113, at least one end of the sub-case 101 along the second direction is provided with an opening 110, the case 100 further includes an end plate 111, each sub-case 101 at least corresponds to one end plate 111, that is, each end plate 111 corresponds to a part of the case body 113, when a certain region in the battery pack 10 fails, the region where the failure occurs is determined through external detection, and then the end plate 111 corresponding to the region is disassembled without disassembling all the end plates 11, thereby saving the disassembling and assembling time, and simultaneously avoiding other regions in the battery pack which do not fail being exposed to the outside, thereby ensuring the safety during disassembling and assembling maintenance, and increasing the design flexibility and universality of the battery pack 10 due to the structure of the plurality of sub-cases 101, thereby facilitating the standardization of the battery pack 10, The structure beam 200 is positioned between the top plate 102 and the bottom plate 103, and the structure beam 200 is connected to the top plate 102 and the bottom plate 103, so the structure beam 200, the top plate 102 and the bottom plate 103 form an I-shaped structure, the structure has high strength and rigidity, thereby the box body 100 of the battery pack 10 has good properties of bearing, impact resistance and extrusion resistance, and when the battery pack 10 is mounted on a whole vehicle, the structural strength of the battery pack 10 can be used as a part of the structural strength of the whole vehicle, and simultaneously the design and manufacturing cost of the whole vehicle is reduced, in addition, the pole core group 400 is packaged in the packaging mold 500, a plurality of pole core groups 400 are connected in series to form the pole core string 401, and the pole core string 401 is arranged in the box body 100 of the battery pack 10, so as to realize double-layer sealing through the packaging mold 500 and the box body 100 of the battery pack 10, is beneficial to improving the sealing effect.

In some embodiments, the end plates 111 at the same end of the box 100 along the second direction may be connected together, for example, by bonding, welding, or screwing.

In the present application, the pole core group 400 includes at least one pole core, and when the pole core group 400 includes more than two pole cores, the pole cores are connected in parallel.

The pole core mentioned in the present application is a pole core commonly used in the field of power batteries, and the pole core group 400 belong to the constituent parts of the battery and cannot be understood as the battery itself; in addition, the pole core can be formed by winding or can be made in a lamination mode; generally, the pole core includes at least a positive pole piece, a separator, and a negative pole piece.

In addition, the structural beam 200 is connected to the top plate 102 and the bottom plate 103, and it is understood that the structural beam 200 is integrally formed with the top plate 102 and the bottom plate 103; alternatively, the structural beam 200, the top plate 102 and the bottom plate 103 may be separately formed and then connected by a direct or indirect connection, which is not particularly limited in the present application. The direct connection may be that one end of the structural beam 200 is connected to the bottom plate 103 and the opposite end of the structural beam 200 is connected to the top plate 102, for example, one end of the structural beam 200 may be welded to the bottom plate 103 and then the opposite end of the structural beam 200 may be welded to the top plate 102. The indirect connection may be such that one end of the structural beam 200 is connected to the bottom plate 103 via an intermediate plate and the opposite end of the structural beam 200 is connected to the top plate 102 via an intermediate plate.

In some embodiments, at least one structural beam 200 is joined to the top plate 102 and the bottom plate 103. It is understood that the top plate 102, the bottom plate 103 and the structural beam 200 are integrally formed; or, one of the top plate 102 and the bottom plate 103 is integrally formed with the structural beam 200, and the other is welded to the structural beam 200; alternatively, one end of the structural beam 200 is welded to the bottom plate 103 and the opposite end of the structural beam 200 is welded to the top plate 102.

It should be noted that, the plurality of pole core strings 401 are electrically connected to each other, and the pole core strings 401 in two adjacent accommodating cavities 300 may be connected in series or in parallel; the pole core strings 401 in the two spaced accommodating cavities 300 may also be connected in series or in parallel; three or more pole core strings 401 in the containing cavity 300 can be connected in series or in parallel.

In addition, the number of the pole core strings 401 in each accommodating cavity 300 and the number of the pole core groups 400 included in each pole core string 401 can be designed according to different power requirements. Also, the number of pole core strings 401 in each receiving cavity 300 may be the same or different. When a plurality of pole core strings 401 are arranged in the accommodating cavity 300, the pole core strings 401 can be connected in series, in parallel or in series-parallel.

In addition, the case 100 of the battery pack 10 of the present application is provided with a mounting portion 104, and the case 100 of the battery pack 10 is detachably or non-detachably connected and fixed to an external load through the mounting portion 104 provided thereon. Generally, the case 100 of the battery pack 10 needs to be connected and fixed to an external load, and thus has special requirements for impact resistance, extrusion resistance and the like, and thus cannot be simply equivalent to the case 100 of a battery module or a single battery. Generally, the battery pack 10 further includes at least one of a Battery Management System (BMS), a battery connector, a battery sampler, and a battery thermal management system.

In an embodiment, as shown in fig. 1 to 3, the box 100 includes a sub-box 101, at least one end of the sub-box 101 along the second direction is opened with an opening 110, and the opening 110 corresponds to a plurality of end plates 111.

In an embodiment, as shown in fig. 2 to 4, the box 100 includes a plurality of sub-boxes 101, at least one end of the sub-boxes 101 along the second direction is opened with an opening 110, and each opening 110 corresponds to one of the end plates 111.

In an embodiment, the box 100 includes a plurality of sub-boxes 101, at least one end of the sub-boxes 101 along the second direction is opened with an opening 110, and each opening 110 corresponds to a plurality of end plates 111.

In an embodiment, the two ends of the sub-case 101 along the second direction are both provided with openings 110, and the openings 110 are sealed by the end plates 11, and it can be understood that when the two ends of the sub-case 101 along the second direction are both provided with openings 110, 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 cavity 300 can be respectively led out from the two openings 110.

Alternatively, the connection between the end plate 111 and the opening 110 may be a detachable connection such as a screw connection, a rivet connection, or the like, or a connection by welding, bonding, or the like, but it is necessary to ensure the sealing property between the end plate 111 and the sub-box 101.

In one embodiment, the case 100 includes a first explosion-proof valve 804, and the first explosion-proof valve 804 is disposed on the end plate 111, so that the pressure in the second direction in the battery pack 10 is prevented from exceeding a predetermined value

In an embodiment, the end plate 111 is a hollow structure, and the end plate 111 is provided with a reinforcing rib inside, so that the material is saved, the overall weight of the battery pack 10 is reduced, the structural strength of the end portion of the battery pack 10 in the second direction is improved, and the stability of the internal pole core of the battery pack 10 is ensured.

In an embodiment, as shown in fig. 1 to 3, the box body 100 further includes a first side beam 106 and a second side beam 107 distributed on two opposite sides of the box body 113 along a third direction, the second direction is a length direction of the box body 100, and the third direction is a width direction of the box body 100; alternatively, the second direction is a width direction of the case 100, and the third direction is a length direction of the case 100.

In an embodiment, as shown in fig. 3 to 5, the plurality of sub-boxes 101 are sequentially arranged along the third direction, the sub-boxes 101 at two ends of the plurality of sub-boxes 101 in the third direction are end sub-boxes, one of the two end sub-boxes is connected to the first edge beam 106, and the other is connected to the second edge beam 107. In fig. 5, the first sub-box 101 and the last sub-box 101 along the Y direction are end sub-boxes, respectively.

Further, the end sub-box connected to the first side member 106 is integrally formed with the first side member 106, and the end sub-box connected to the second side member 107 is integrally formed with the second side member 107. Therefore, the processing technology can be simplified, the cost is reduced, and the sufficient structural strength can be ensured.

Specifically, the first side member 106 and at least one of the top plate 102 and the bottom plate 103 of the end sub-tank connected to the first side member 106 are integrally formed, and the second side member 107 and at least one of the top plate 102 and the bottom plate 103 of the end sub-tank connected to the second side member 107 are integrally formed. For example, a one-piece aluminum profile is extruded.

However, in other embodiments, the end sub-box connected to the first side rail 106 is integrally formed with the first side rail 106, and the end sub-box connected to the second side rail 107 is connected to the second side rail 107 by direct or indirect means. Alternatively, the end sub-box connected to the second side rail 107 and the second side rail 107 are integrally formed, and the end sub-box connected to the first side rail 106 and the first side rail 106 are directly or indirectly connected.

In one embodiment, as shown in fig. 3 to 5, the first side beam 106 and the second side beam 107 have a cavity therein, and a partition 108 is disposed in the cavity, wherein the partition 108 divides the cavity into a plurality of sub-cavities. With this arrangement, the first and

second side members

106 and 107 can be ensured to have a certain structural strength, thereby contributing to an improvement in the impact and crush resistance of the battery pack 10. However, in other embodiments, the first side rail 106 or the second side rail 107 has a cavity therein.

In one embodiment, as shown in fig. 3-5, the tank body 113 further includes a connecting plate 109, and the connecting plate 109 is connected between two adjacent sub-tanks 101. The connection mode is not particularly limited in the application, and can be detachable connection, such as bolt connection, riveting and the like; or a non-detachable connection, such as welding, gluing, etc.

In one embodiment, the connecting plate 109 has a cavity therein, and a partition 108 is disposed in the cavity, wherein the partition 108 divides the cavity into a plurality of sub-cavities. With such an arrangement, the structural strength of the connecting plate 109 can be increased, and the reliability of the connection between the two sub-housings 101 can be improved.

In one embodiment, as shown in fig. 3 to 5, a plurality of structural beams 200 are disposed in the sub-tank 101, the structural beams 200 are spaced apart along a third direction, a length of each structural beam 200 extends along the second direction, each structural beam 200 is connected to the top plate 102 and the bottom plate 103, and the third direction is different from the first direction and the second direction. In this embodiment, a plurality of structural beams 200 are provided within each sub-tank 101. Of course, in other embodiments, a plurality of structural beams 200 may be provided in part of the sub-tank 101 according to actual needs.

In this application, the first direction is the height of the box 100, the second direction is the width of the box 100, and the third direction is the length of the box 100; alternatively, the second direction is a longitudinal direction of the case 100, and the third direction is a width direction of the case 100. Wherein the first direction is the X direction in the figure, the second direction is the Z direction in the figure, and the third direction is the Y direction in the figure.

However, in other embodiments, any two of the first direction, the second direction and the third direction may be disposed at other angles, for example, 80 ° or 85 °, and the present application is not limited thereto.

It should be noted that the structural beam 200 is connected to the top plate 102 and the bottom plate 103, and it is understood that the structural beam 200 is integrally formed with the top plate 102 and the bottom plate 103; alternatively, the structural beam 200, the top plate 102 and the bottom plate 103 may be separately formed and then connected by a direct or indirect connection, which is not particularly limited in the present application.

In some embodiments, at least one of the top plate 102 and the bottom plate 103 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 102, the bottom plate 103, and the structural beam 200 are integrally formed. For example, a one-piece aluminum profile extrusion may be used. In another embodiment, the bottom plate 103 is integrally formed with the structural beam 200 and then the top plate 102 is welded to the structural beam 200. Alternatively, the top plate 102 is integrally formed with the structural beam 200, and then the bottom plate 103 is welded to the structural beam 200.

It can be understood that, when each structural beam 200 is connected to the top plate 102 and the bottom plate 103, each structural beam 200, the top plate 102 and the bottom plate 103 form an i-shaped structure, so that the box body 100 of the battery pack 10 is integrally formed into a honeycomb structure, and the structure has high strength and rigidity, thereby meeting the requirements of the box body 100 on the properties of bearing, impact resistance, extrusion resistance and the like. Moreover, the structure of the box 100 is relatively simple and the space utilization rate is high. 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 a further embodiment, the first side beam 106 and the second side beam 107 are provided with mounting portions 104, and the mounting portions 104 are used for being connected and fixed with an external load.

Of course, in other embodiments, the mounting portion 104 may be disposed on the top plate 102 or the bottom plate 103.

In one embodiment, as shown in fig. 1 and 2, the mounting portion 104 is a mounting hole 105 disposed on a first side rail 106 and a second side rail 107. The mounting holes 105 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 hole 105 provided in the first side sill 106 penetrates the first side sill 106 in the first direction, and the mounting hole 105 provided in the second side sill 107 penetrates the second side sill 107 in the first direction. However, the axial direction of the mounting hole 105 may also be arranged at an angle to the first direction, for example 5 ° or 10 °.

Further, a plurality of mounting holes 105 are provided, and the mounting holes 105 provided in the first side member 106 are arranged in order along the longitudinal direction of the first side member 106. Wherein the length direction of the first side beam 106 is parallel to the second direction.

Similarly, the mounting holes 105 provided in the second side member 107 are arranged in order along the longitudinal direction of the second side member 107. Wherein the length direction of the second side beam 107 is parallel to the second direction.

Of course, in another embodiment, the mounting portion 104 is a bail provided on the first and second side rails 106, 107. The hanging ring is fixedly connected with an external load to connect and fix the battery pack 10 to the external load.

However, in another embodiment, the mounting portion 104 is a mounting block disposed on the first and second side beams 106, 107, which may be secured to the external load by welding. Of course, the mounting block may also be fixed to the external load by gluing or snapping.

In an embodiment, the length of the receiving cavity 300 in the second direction is greater than 500mm, and further, the length of the receiving cavity 300 in the second 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 receiving cavity 300 in the second direction is 1000mm to 2000 mm.

Further, the length of the receiving cavity 300 in the second direction is 1300mm to 2200 mm.

In some embodiments, as shown in fig. 2, 6 and 7, the sub-tank 101 has a first end and a second end opposite to each other along the second direction, and at least one of the first end and the second end of the sub-tank 101 is provided with an opening 110; the case 100 further includes end plates 111 closing the openings 110, and each opening 110 corresponds to at least one end plate 111. With this arrangement, only the end plate 111 corresponding to the opening 110 of the sub-tank 101 needs to be removed when replacement or maintenance is performed, so that the operation can be simplified.

It can be understood that the pole core string 401 can be installed in the accommodating cavity 300 through the opening 110 of the sub-case 101 in a manner that is convenient for operation and at the same time ensures that the sub-case 101 has high structural strength.

In some embodiments, as shown in fig. 2, 6 and 7, the battery pack 10 further includes a plurality of insulating holders 600, the insulating holders 600 are located inside the end plates 111, and the insulating holders 600 are provided at the openings 110 of at least one of the first and second ends of the sub-case 101. The two polar core groups 400 located at the same side and adjacent to the opening 110 of the sub-case 101 in two adjacent receiving cavities 300 are electrically connected through the first conductive member 440, and the first conductive member 440 is fixed to the insulating support 600. With such an arrangement, when the sub-tank 101 is repaired or replaced, only the insulating support 600 corresponding to the sub-tank is removed, thereby simplifying the operation. Also, each of the insulating supports 600 may serve to fixedly support and insulate the first conductive member 440 disposed thereon.

In this embodiment, an insulating support 600 is disposed at the opening 110 of the first end or the second end of each sub-tank 101.

Here, the inner side of the end plate 111 may be understood as a side of the end plate 111 close to the pole core group 400. The first conductive member 440 is a connecting piece, but may have other shapes, such as a column shape.

In a further embodiment, as shown in fig. 3 and 6, the plurality of insulating supports 600 at the same end of the box body 113 along the second direction are integrally formed. That is, the plurality of insulating supports 600 at the first end of the tank body 113 are integrally formed, and/or the plurality of insulating supports 600 at the second end of the tank body 1133 are integrally formed. So set up, can simplify insulating support 600's processing, be favorable to practicing thrift the cost.

In some embodiments, the first conductive member 440 is disposed on a side of the insulating support 600 facing away from the pole core assembly 400, the pole core assembly 400 includes a first electrode leading-out part 410 and a second electrode leading-out part 420 for leading out current, and 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 assembly 400 along a second direction; the first electrode lead-out part 410 of one polar core group 400 and the first electrode lead-out part 410 of the other polar core group 400 in the two adjacent accommodating cavities 300, which are positioned on the same side and adjacent to the opening 110, penetrate through the insulating bracket 600 and the first conductive member 440 and are electrically connected through the first conductive member 440, so that the parallel connection of the polar core groups 400 of the two adjacent accommodating cavities 300 is realized, and the connection path of the connection mode is relatively short, which is beneficial to reducing the internal resistance.

In other embodiments, the second electrode drawing part 420 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 opening 110, penetrate through the insulating support 600 and the first conductive member 440 and are electrically connected through the first conductive member 440, so that the parallel connection of the pole core groups 400 of the two adjacent accommodating cavities 300 is realized, and the connection path of the connection manner is relatively short, which is beneficial to reducing the internal resistance.

In other embodiments, the first electrode lead-out part 410 of one pole core group 400 and the second electrode lead-out part 420 of the other pole core group 400 in the two adjacent receiving cavities 300, which are located on the same side and adjacent to the opening 110, penetrate through the insulating support 600 and the first conductive member 440 and are electrically connected through the first conductive member 440, so that the serial connection of the pole core groups 400 of the two adjacent receiving cavities 300 is realized, and the connection path of the connection manner is relatively short, which is beneficial to reducing the internal resistance.

In a further embodiment, as shown in fig. 2, 6 and 7, the battery pack 10 further includes a plurality of insulating covers 700, and the insulating covers 700 are disposed between the insulating support 600 and the end plate 111. The insulation protection cover 700 may protect the first conductive member 440 fixed on the insulation support 600 to prevent the first conductive member 440 and the connection between the first conductive member 440 and the first electrode lead-out member 410 or the second electrode lead-out member 420 from being damaged, and also prevent the first conductive member 440 from contacting other metal members to cause a short circuit.

In a further embodiment, as shown in fig. 3 and 6, the insulation protection covers 700 at the same end of the box body 113 along the second direction are integrally formed. That is, the insulation protective covers 700 at the first end of the box body 113 are integrally formed, and/or the insulation protective covers 700 at the second end of the box body 113 are integrally formed. With such an arrangement, the processing of the insulation protection cover 700 can be simplified, which is beneficial to saving cost.

In one embodiment, as shown in fig. 7, 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. 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. 9 and 10, 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 second direction, and the first electrode drawing part 410 of one pole core group 400 of two adjacent pole core groups 400 constituting the pole core string 401 is electrically connected to 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, the pole core groups 400 forming the pole core string 401 adopt a head-to-head arrangement mode, and the arrangement mode can conveniently realize two-two series connection between the pole core groups 400, and the connection structure is simple.

In an embodiment, as shown in fig. 2 to 4, a plurality of pole core strings 401 are disposed in the accommodating cavity 300, the plurality of pole core strings 401 are sequentially arranged and electrically connected along a thickness direction of the pole core assembly 400, and the thickness direction of the pole core assembly 400 is parallel to a third direction. 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. 11 and 12, in a further embodiment, multiple pole piece strings 401 within the same housing 300 are connected in series.

The first pole-core group 400 of one pole-core string 401 of the adjacent two pole-core strings 401 is electrically connected with the first pole-core group 400 of the other pole-core string 401. Alternatively, the last pole-core group 400 of one pole-core string 401 of the two adjacent pole-core strings 401 is electrically connected with the last pole-core group 400 of the other pole-core string 401. As shown in fig. 11 and 12, the leftmost pole core group 400 is the first pole core group 400, and the rightmost pole core group 400 is the last pole core group in the two pole core strings 401.

Further, the first electrode lead-out part 410 of the first pole core group 400 of one pole core string 401 of two adjacent pole core strings 401 is located on the same side as the second electrode lead-out part 420 of the first pole core group 400 of the other pole core string 401 (as shown in fig. 11). Alternatively, 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 on the same side as the first electrode lead-out member 410 of the last pole core group 400 of the other pole core string 401 (as shown in fig. 12).

The plurality of pole core strings 401 in the same accommodating cavity 300 are connected in series in the above connection mode, so that the path of the electrical connection is short, and the internal resistance is reduced. In other embodiments, other series connections may be used.

Referring to fig. 13, in a further embodiment, multiple pole piece strings 401 within the same housing 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. 13, the leftmost pole core group 400 is the first pole core group 400, and the rightmost pole core group 400 is the last pole core group in the two pole core strings 401.

Further, the first electrode drawing part 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 drawing part 410 of the first pole-core group 400 of the other pole-core string 401, and the second electrode drawing part 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 drawing part 420 of the last pole-core group 400 of the other pole-core string 401.

The plurality of pole core strings 401 in the same accommodating cavity 300 are connected in parallel by adopting the connection mode, so that the electric connection path is shorter, and the internal resistance is favorably reduced. 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. 14, 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. 14, 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. 14 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, a first pole core string 401 of one accommodating cavity 300 in the third direction may be electrically connected to a second pole core string 401 of another accommodating cavity 300 in the third direction, that is, two pole core strings 401 at the nearest spacing positions in 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 two adjacent accommodating cavities 300 are connected in series in the above connection mode, so that the path of the electrical connection is short, and the internal resistance is reduced. 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.

Further, the first 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 with the first pole core group 400 of one pole core string 401 disposed adjacent to the first receiving chamber 300 in the second receiving chamber 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 above connection method can make the electrical connection path shorter, which is beneficial to reducing the internal resistance.

Referring to fig. 15, in a further embodiment, the pole piece strings 401 in two adjacent receiving cavities 300 are connected in parallel.

Specifically, 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 to the first pole-core group 400 of one of the pole-core strings 401 in the other accommodating cavity 300, and the last pole-core group 400 of one of the pole-core strings 401 in one of the two adjacent accommodating cavities 300 is electrically connected to the last pole-core group 400 of one of the pole-core strings 401 in the other accommodating cavity 300. In fig. 15, 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.

Further, 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 two adjacent accommodating cavities 300 are connected in parallel in the connection mode, so that the path of electric connection is short, and the internal resistance is reduced. 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 above connection method can make the electrical connection path shorter, which is beneficial to reducing the internal resistance.

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. 16, 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. 16, 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. 17, 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. 17, 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. 9 and 10 again, in a further embodiment, the pole core group 400 includes a pole core group main body 430, and 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 two opposite sides of the pole core group main body 430 along a second direction, and the first electrode drawing part 410 of one pole core group 400 of two adjacent pole core groups 400 forming the pole core string 401 is electrically connected with the second electrode drawing part 420 of the other pole core group 400 through a second conductive member 460;

a fixed spacing ring 450 is arranged between the pole core group main bodies 430 of two adjacent pole core groups 400, and the second conductive piece 460 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 includes a first space ring 453 and a second space ring 454 which are oppositely arranged along the third direction, the second conductive member 460 is located between the first space ring 453 and the second space ring 454, and the first space ring 453 and the second space ring 454 are connected to clamp and fix the second conductive member 460, 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 second conductive member 460, an insertion hole 452 is provided on the other of the first space ring 453 and the second space ring 454, 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 second conductive member 460 is sandwiched therebetween.

Referring to fig. 18, in a further embodiment, a plurality of pole-core groups 400 constituting a 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 lead-out part 410 and a second electrode lead-out part 420 for leading out current, wherein the connection part of the first electrode lead-out part 410 of one pole core group 400 and the second electrode lead-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 510 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. 19, 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 400 and each spare part in the box 100, improves the life of the inside utmost point core group 400 of box 100 or each spare part.

In a further embodiment, the chamber 100 is provided with a suction hole. The number of the pumping holes may be one or more, and the pumping holes may be disposed at positions of the top plate 102 or the bottom plate 103 corresponding to the accommodating cavities 300, or disposed on the first side beam 106 and the second side beam 107.

In a further embodiment, the box 100 is provided with glue injection holes 112 (as shown in fig. 2), each accommodating cavity 300 is correspondingly communicated with at least one glue injection hole 112, and the glue injection holes 112 are used for filling glue into the corresponding accommodating cavities 300 so as to fixedly connect the pole core assembly 400 and the box 100. 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 the present embodiment, the glue injection hole 112 is provided on the top plate 102 of the sub-tank 101. Of course, in other embodiments, the glue injection hole 112 may also be disposed on the bottom plate 103 of the sub-box 101.

In a further embodiment, two adjacent pole-core groups 400 forming the pole-core string 401 are electrically connected through the second conductive member 460, and the glue injection hole 112 is disposed corresponding to the second conductive member 460. So set up, can guarantee to have higher joint strength between utmost point core group 400.

In some embodiments, as shown in fig. 2, a second explosion-proof valve 800 is provided on the box body 100, and the second explosion-proof valve 800 seals the glue injection hole 112. In this way, the second explosion-proof valve 800 can serve as a sealing cover for sealing the glue injection hole 112 and also can serve as a safety explosion-proof function.

In some embodiments, as shown in fig. 2 and 20, the second explosion prevention valve 800 has a weakened area 803; the second explosion-proof valve 800 comprises a cover body 802 connected with the box body 100 in a sealing mode and a protruding part 801 arranged on the cover body 802, the protruding part 801 protrudes towards the side away from the pole core group 400, and a weak area 803 is formed on the outer peripheral wall of the protruding part 801. Thus, when the pole core assembly 400 in the battery pack 10 abnormally operates to generate excessive gas, the gas pressure will break the weak area 803 of the second explosion-proof valve 800, thereby preventing the battery pack 10 from safety accidents.

It should be noted that the weakened area 803 may be a groove or a notch. Alternatively, the thickness of the weakened area 803 is lower than the thickness of the other portion of the second explosion-proof valve 800.

Further, the glue injection hole 112 is disposed on the top plate 102, and the cover 802 is hermetically connected to the top plate 102. The sealing connection is not particularly limited, and may be achieved by welding or gluing, for example.

In an embodiment, the battery pack 10 further includes a plurality of liquid cooling members 900, the plurality of liquid cooling members 900 are correspondingly disposed on the bottom plates 103 of the plurality of sub-cases 101, and the liquid cooling members 900 are disposed to cool and dissipate heat of the electrode core assembly 400. Further, the plurality of liquid cooling members 900 are integrally formed members. By the arrangement, the processing technology can be simplified, and the cost can be reduced.

The application also provides an electric vehicle, which comprises a vehicle body and the battery pack 10, wherein the battery pack 10 is fixed on the vehicle body through the mounting part 104. The application provides an electric motor car, when installing this kind of battery package 10 on whole car, this battery package 10's structural strength can regard as a part of whole car structural strength to can promote the structural strength of whole car, be favorable to realizing whole car of electric automobile. The design requirement of lightweight also reduces design and manufacturing cost of whole car simultaneously. In addition, the height of the battery pack 10 of the present application is relatively low so as not to occupy too much space at the vehicle height.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A battery pack is characterized by comprising a box body and a plurality of pole core strings which are positioned in the box body and are electrically connected with each other;

the box body comprises at least one sub-box body, the at least one sub-box body is connected to form a box body of the box body, at least one end of the sub-box body along a second direction is provided with an opening, the box body further comprises an end plate for closing the opening, and the second direction is the width direction of the box body or the length direction of the box body;

the sub-box body comprises at least one structural beam, a top plate and a bottom plate which are oppositely arranged along a first direction, the first direction is the height direction of the box body, the structural beam is positioned between the top plate and the bottom plate, at least one structural beam is connected to the top plate and the bottom plate, the at least one structural beam divides the inner part of the sub-box body into a plurality of accommodating cavities, and at least one pole core string is arranged in at least one accommodating cavity;

2. The battery pack according to claim 1, wherein both ends of the sub-case in the second direction are provided with openings.

3. The battery pack according to claim 2, wherein the case further comprises a first explosion-proof valve provided on the end plate.

4. The battery pack according to claim 1, wherein the end plate has a hollow interior, and the end plate has reinforcing ribs on the interior.

5. The battery pack according to claim 3, further comprising a plurality of insulating holders, the insulating holders being located inside the end plates, the insulating holders being provided at openings at least one end of the sub-case in the second direction, the two polar core groups located at the same side in the second direction in adjacent two of the accommodating cavities and adjacent to the openings of the sub-case being electrically connected by a first conductive member, the first conductive member being fixed to the insulating holders.

6. The battery pack according to claim 2, wherein the plurality of insulating supports at the same end of the case in the second direction are integrally formed.

7. The battery pack of claim 6, further comprising a plurality of insulating protective covers disposed between the insulating supports and the end plates.

8. The battery pack according to claim 7, wherein the plurality of insulating protective covers at the same end of the case in the second direction are integrally formed.

9. The battery pack of claim 1, wherein the pole piece string has a length greater than 400 mm; the pole core group comprises a first electrode leading-out part and a second electrode leading-out part which are used for leading out current, the first electrode leading-out part and the second electrode leading-out part are distributed on two opposite sides of the pole core group along a second direction, and the first electrode leading-out part of one pole core group in the two adjacent pole core groups is electrically connected with the second electrode leading-out part of the other pole core group.

10. The battery pack according to claim 9, wherein a plurality of the pole core strings are disposed in the accommodating cavity, the plurality of pole core strings are sequentially arranged in a thickness direction of the pole core group and electrically connected, the thickness direction of the pole core group is parallel to a third direction, the second direction is a length direction of the case, and the third direction is a 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.

11. The battery pack of claim 10, wherein a plurality of the pole core strings within the same receiving cavity are connected in series;

the first pole core group of one pole core string in two adjacent pole core strings is electrically connected with the first pole core group of the other pole core string, the first electrode lead-out component of the first pole core group of the one pole core string in the two adjacent pole core strings is positioned on the same side as the second electrode lead-out component of the first pole core group of the other pole core string, or the last pole core group of the one pole core string in the two adjacent pole core strings is electrically connected with the last pole core group of the other pole core string, and the second electrode lead-out component of the last pole core group of the one pole core string in the two adjacent pole core strings is positioned on the same side as the first electrode lead-out component of the last pole core group of the other pole core string.

12. The battery pack of claim 11, wherein a plurality of pole pieces within the same receiving cavity are connected in series-parallel;

the first pole core group of one pole core string in the two adjacent pole core strings is electrically connected with the first pole core group of the other pole core string, and the last pole core group of one pole core string in the two adjacent pole core strings is electrically connected with the last pole core group of the other pole core string;

the first electrode leading-out part of the first pole core group of one pole core string in the two adjacent pole core strings and the first electrode leading-out part of the first pole core group of the other pole core string are positioned on the same side, and the second electrode leading-out part of the last pole core group of the one pole core string in the two adjacent pole core strings and the second electrode leading-out part of the last pole core group of the other pole core string are positioned on the same side.

13. The battery pack of claim 12, wherein the pole piece strings in adjacent two receiving cavities are connected in series;

the first pole core group of one pole core string in one accommodating cavity of the two adjacent accommodating cavities is electrically connected with the first pole core group of one pole core string in the other accommodating cavity, the first electrode leading-out part of the first pole core group of one pole core string in one accommodating cavity 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 pole core string 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.

14. The battery pack according to claim 13, 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 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;

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

15. The battery pack of claim 14, wherein a pole piece string is disposed within the receiving cavity; the pole core strings in the two adjacent accommodating cavities are connected in series or in parallel;

when the pole core strings in the two adjacent accommodating cavities are connected in series, the first pole core group of the pole core string in one accommodating cavity in the two adjacent accommodating cavities is electrically connected with the first pole core group of the pole core string in the other accommodating cavity, or the last pole core group of the pole core string in one accommodating cavity in the two adjacent accommodating cavities is electrically connected with the last pole core group of the pole core string in the other accommodating cavity;

when two adjacent utmost point core groups that hold the intracavity are parallel connection, two adjacent first utmost point core groups that hold the utmost point core cluster in the intracavity and another hold the first utmost point core group electricity of the utmost point core cluster in the intracavity and hold two adjacent last utmost point core groups that hold the utmost point core cluster in the intracavity and another hold the last utmost point core group electricity of the utmost point core cluster in the intracavity and be connected.

16. The battery pack of claim 1, wherein the pole core groups comprise a pole core group main body and a first electrode lead-out part and a second electrode lead-out part for leading out current, the first electrode lead-out part and the second electrode lead-out part are distributed on two opposite sides of the pole core group main body along a second direction, and the first electrode lead-out part of one of the two adjacent pole core groups is electrically connected with the second electrode lead-out part of the other pole core group through a first conductive member;

a fixed space ring is arranged between the pole core group main bodies of two adjacent pole core groups, and the first conductive piece is fixed in the fixed space ring; structural adhesive is filled between the pole core group main bodies of the two adjacent pole core groups and the fixed space ring;

the fixed space ring comprises a first space ring and a second space ring which are oppositely arranged along a third direction, the first conductive piece is positioned between the first space ring and the second space ring, the first space ring and the second space ring are connected to clamp and fix the first conductive piece, and the third direction is different from the first direction and the second direction.

17. The battery pack of claim 1, wherein the plurality of pole core groups making up the pole core string are encapsulated in an encapsulation film; the pole core group comprises a pole core group main body, a first electrode leading-out part and a second electrode leading-out part, wherein the first electrode leading-out part and the second electrode leading-out part are used for leading out current; and the packaging part is formed at the position of the packaging film opposite to the first electrode lead-out part and/or the second electrode lead-out part so as to separate the adjacent two polar core group main bodies.

18. 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.

19. The battery pack of claim 1, wherein the pressure of the air inside the receiving cavity is lower than the pressure of the air outside the case.

20. The battery pack of claim 19, wherein the case body is provided with glue injection holes, and each accommodating cavity is correspondingly communicated with at least one glue injection hole.

21. The battery pack according to claim 20, wherein two adjacent pole core groups constituting the pole core string are electrically connected by a second conductive member, and the glue injection hole is provided corresponding to the second conductive member.

22. The battery pack according to claim 21, wherein a second explosion-proof valve is provided on the case, and the second explosion-proof valve seals the glue injection hole.

23. The battery pack of claim 22, wherein the second explosion-proof valve has a weakened area; the second explosion-proof valve includes with box sealing connection's lid and locates bellying on the lid, the bellying is towards deviating from one side protrusion of utmost point core group, be formed with on the periphery wall of bellying the weak area.

24. The battery pack according to claim 1, further comprising a plurality of liquid cooling members, wherein the plurality of liquid cooling members are correspondingly disposed on the bottom plates of the plurality of sub-cases, and the plurality of liquid cooling members are integrally formed.

25. The battery pack of claim 1, wherein the case body further comprises a first edge beam and a second edge beam disposed on opposite sides of the case body in a third direction;

a plurality of structural beams are arranged in each subbox body, the structural beams are distributed at intervals along a third direction, the length of each structural beam extends along a second direction, and each structural beam is connected to the top plate and the bottom plate; at least one of the top plate and the bottom plate is integrally formed with the structural beam;

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

26. An electric vehicle comprising a vehicle body and the battery pack according to any one of claims 1 to 25, wherein the battery pack is fixed to the vehicle body by the mounting portion.