CN113782902B

CN113782902B - Battery pack and electric vehicle

Info

Publication number: CN113782902B
Application number: CN202010443667.4A
Authority: CN
Inventors: 胡世超; 彭青波; 王晓鹏; 鲁志佩; 朱燕
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2023-05-05
Anticipated expiration: 2040-05-22
Also published as: CN113782902A

Abstract

The application provides a battery package and electric motor car, wherein the battery package includes the box, a block terminal and a plurality of utmost point core cluster, a plurality of utmost point core cluster are located the box and interconnect forms energy storage module, and the block terminal is installed at the lateral surface of box, the block terminal is connected with the utmost point core cluster electricity in the box, so, through installing the block terminal outside the box, thereby when the block terminal breaks down or needs to maintain, need not open the box, can directly operate the block terminal outside the box, can avoid loaded down with trivial details operation process, be favorable to simplifying the process, be convenient for maintain the block terminal.

Description

Battery pack and electric vehicle

Technical Field

The invention belongs to the field of batteries, and particularly relates to a battery pack and an electric vehicle.

Background

The high-voltage distribution box (Power Distribution Unit, PDU) of the electric automobile is a high-voltage distribution unit of the pure electric automobile and the plug-in hybrid electric automobile, and has the functions of guaranteeing the transmission of the power electric energy of the whole automobile system and being a bridge for transmitting the power supply and the electric signals of the power battery and each high-voltage device on the whole automobile. In the prior art, the high-voltage distribution box is usually placed in the battery pack box together with the power battery, and the battery pack box is sealed after the electric wire connection in the battery pack box is completed, so that when the high-voltage distribution box breaks down or needs to be replaced, the battery pack box needs to be opened, the tightness of the battery pack can be influenced, the maintenance and replacement processes are complex, the working procedure is complex, and the high-voltage distribution box is inconvenient to maintain.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. To this end, in a first aspect of the present application, there is provided a battery pack including a case, a distribution box, and a plurality of pole strings;

the plurality of pole core strings are positioned in the box body, the plurality of pole core strings are electrically connected with one another to form an energy storage component, the distribution box comprises an outer shell and a distribution component positioned in the outer shell, the outer shell is mounted on the outer side face of the box body, and the distribution component is electrically connected with the energy storage component;

the box body comprises a box body, the box body comprises at least one sub box body, at least one partition plate is arranged in the sub box body, the sub box body comprises an upper cover plate and a lower bottom plate which are oppositely arranged along a first direction, the first direction is the height direction of the box body, the at least one partition plate is connected between the upper cover plate and the lower bottom plate so as to divide the interior of the sub box body into a plurality of accommodating cavities, and at least one pole core string is arranged in each accommodating cavity;

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

The outer side surface of the box body is also provided with a fixing part which is fixedly connected with an external carrier.

In another aspect of the present application, there is provided an electric vehicle including a vehicle body and the battery pack as described above, the battery pack being fixed to the vehicle body by the fixing portion.

Compared with the prior art, the beneficial effect that this application had is: the battery pack comprises a box body, a distribution box and a plurality of pole core strings, wherein the pole core strings are located in the box body and are electrically connected with each other to form an energy storage component, the distribution box is arranged on the outer side face of the box body, and the distribution box is electrically connected with the pole core strings in the box body so as to realize a distribution function.

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

Drawings

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

FIG. 2 is a schematic view of the electrical box shown in FIG. 1 with the cover separated from the cylindrical body;

FIG. 3 is an exploded view of a battery pack according to one embodiment of the present application;

FIG. 4 is a schematic structural view of a case according to an embodiment of the present disclosure;

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

fig. 6 is an exploded view showing a part of the structure of a battery pack according to an embodiment of the present application;

fig. 7 is an exploded view showing a partial structure of another battery pack according to an embodiment of the present application;

FIG. 8 is an exploded schematic view of a power distribution box provided in an embodiment of the present application;

fig. 9 is a schematic view of a base of the distribution box separated from the cylindrical body according to an embodiment of the present application;

fig. 10 is another schematic structural view of a battery pack according to an embodiment of the present application;

fig. 11 is an exploded view of the battery pack shown in fig. 10;

FIG. 12 is a schematic view of a pole string according to an embodiment of the present disclosure;

FIG. 13 is a schematic view illustrating a connection structure between a pole core assembly and a fixed spacer ring according to an embodiment of the present disclosure;

FIG. 14 is an exploded view of FIG. 13;

FIG. 15 is a schematic diagram of a serial connection of two pole strings in the same housing cavity according to an embodiment of the present disclosure;

FIG. 16 is a schematic view of another embodiment of the present application in which two pole strings are serially connected in the same housing;

FIG. 17 is a schematic diagram of a serial-parallel connection of two pole pieces in the same housing cavity according to an embodiment of the present disclosure;

FIG. 18 is a schematic diagram of a serial connection of two pole strings in two receiving cavities according to an embodiment of the present disclosure;

FIG. 19 is a schematic diagram of a series-parallel connection of two pole pieces in two accommodating chambers according to an embodiment of the present disclosure;

FIG. 20 is a schematic diagram of a series connection of two pole strings in two receiving cavities according to another embodiment of the present disclosure;

FIG. 21 is a schematic diagram of two pole pieces connected in series and parallel in two receiving cavities according to another embodiment of the present disclosure;

FIG. 22 is a schematic structural view of an explosion-proof valve according to an embodiment of the present application;

FIG. 23 is a schematic structural view of a packaging film packaging pole piece group according to an embodiment of the present disclosure;

fig. 24 is a schematic structural diagram of another package film package pole core set according to an embodiment of the present application.

Reference numerals:

10. a battery pack; 12. a distribution box;

100. a box main body; 101. a sub-box; 102. a glue injection hole; 110. a fixing part; 112. an end plate; 1121. a total positive interface; 1122. a total negative interface; 1123. a sampling interface; 120. an upper cover plate; 121. an outer housing; 1211. a base; 1212. a cylindrical body; 1213. a cover; 1214. a total positive interface; 1215. a total negative interface; 1216. a sampling interface; 1217. an anode output interface; 1218. a negative electrode output interface; 1219. a sampling output interface; 1211', a base; 1212', cover; 122. a power distribution assembly; 130. a lower base plate; 140. A first frame; 141. a reinforcing plate; 142. a connecting plate; 143. reinforcing ribs; 150. a second frame; 180. an opening;

200. A partition plate;

300. a receiving chamber;

400. a pole core group; 401. a pole core string; 410. a first electrode lead-out member; 420. a second electrode lead-out member; 430. a pole core group main body; 440. a first conductive member; 450. fixing the spacer ring; 451. a plug pin; 452. a jack; 453. a first spacer; 454. a second spacer ring; 460. a second conductive member;

500. packaging films; 510. a packaging part;

600. an insulating support;

700. an insulating protective cover;

800. an explosion-proof valve; 801. a boss; 802. a cover body; 803. a weakened area;

900. and a liquid cooling piece.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Referring to fig. 1 to 5, in a battery pack 10 according to an embodiment of the present application, the battery pack 10 includes a case, a distribution box 12, and a plurality of pole strings 401. The plurality of pole core strings 401 are located inside the box, and the plurality of pole core strings 401 are electrically connected with each other to form an energy storage assembly, that is, the electric power output by the battery pack 10 is derived from the energy storage assembly. The distribution box 12, i.e. the high voltage distribution box (Power Distribution Unit, PDU), is mainly used for transmitting the electric signals generated by the power battery to the electric equipment on the electric vehicle. In this embodiment, as shown in fig. 2, the distribution box 12 includes an outer shell 121 and a distribution assembly 122, the distribution assembly 122 is located in the outer shell 121, the outer shell 121 is installed on the outer side of the box, that is, the distribution box 12 is installed outside the box through the outer shell 121, and the distribution assembly 122 is electrically connected with the energy storage assembly to receive the electrical signal output by the energy storage assembly.

Therefore, this application embodiment is through separately setting up block terminal 12 and energy storage subassembly, and block terminal 12 is the outside of setting at the box to when block terminal 12 breaks down or needs maintenance, need not open the box, can directly operate block terminal 12 outside the box, can avoid loaded down with trivial details operation process, is favorable to simplifying the process, is convenient for maintain the block terminal.

The distribution box 12 may be detachably mounted outside the box, for example, may be fixed on an outer side surface of the box by a bolt or a clamping connection, so as to facilitate the disassembly and replacement of the distribution box 12.

Wherein the box comprises a box body 100, the box body 100 comprises at least one sub-box 101, for example in the embodiment shown in fig. 1 to 7, the box body 100 comprises 3 sub-boxes 101,3 sub-boxes 101 connected together.

As shown in fig. 4, at least one partition plate 200 is disposed in each sub-tank 101, and further, the sub-tank 101 includes an upper cover plate 120 and a lower base plate 130 disposed opposite to each other along a first direction, which is a height direction of the tank, as shown in the drawing, and which is an X direction. The partition board 200 is located between the upper cover board 120 and the lower base board 130, and the partition board 200 is connected to the upper cover board 120, and the partition board 200 is also connected to the lower base board 130, so as to divide the interior of the sub-box 101 into a plurality of accommodating cavities 300, the pole core strings 401 are disposed in the accommodating cavities 300, and further, at least one of the accommodating cavities 300 is provided with at least one pole core string 401.

In the embodiment of the present application, the number of the partition plates 200 in the sub-tank 101 is plural, and the larger the number of the partition plates 200, the larger the number of the accommodation chambers 300 formed in the sub-tank 101. The plurality of partition plates 200 are arranged at intervals along a third direction Y, the length of each partition plate 200 extends along a second direction Z, the plurality of partition plates 200 are connected between the upper cover plate 120 and the lower base plate 130, and the third direction Y is different from the first direction X and the second direction Z, wherein the second direction Z is the length direction of the box body 100, and the third direction Y is the width direction of the box body 100. In other embodiments, the second direction may be the width direction of the box body 100, and the third direction may be the length direction of the box body 100; in addition, any two of the first direction, the second direction and the third direction may be disposed at other angles, for example, 80 ° or 85 °, which is not particularly limited herein.

The plurality of partition boards 200 may be disposed in each sub-tank 101, or the plurality of partition boards 200 may be disposed in a part of the sub-tanks 1010 according to actual needs.

It should be noted that, the partition plate 200 is connected to the upper cover plate 120 and the lower base plate 130, and it is understood that the partition plate 200 is integrally formed with the upper cover plate 120 and the lower base plate 130; alternatively, the partition plate 200, the upper cover plate 120, and the lower base plate 130 are separately manufactured and then connected by direct or indirect connection, which is not particularly limited in this application.

In some embodiments, at least one of the upper cover plate 120 and the lower base plate 130 is integrally formed with the partition plate 200. The arrangement is simple in processing technology, is beneficial to reducing production cost, and can ensure that the box main body 100 has enough structural strength and rigidity so as to meet the requirements of the box main body 100 on the performances of bearing, impact resistance, extrusion resistance and the like.

Specifically, the upper cover plate 120, the lower base plate 130, and the partition plate 200 are integrally formed. For example, an integral aluminum profile extrusion may be used. In another embodiment, the lower plate 130 is integrally formed with the separation plate 200, and then the upper plate 120 is welded with the separation plate 200. Alternatively, the upper cover plate 120 is integrally formed with the partition plate 200, and then the lower base plate 130 is welded to the partition plate 200.

It can be appreciated that when each partition plate 200 is connected to the upper cover plate 120 and the lower base plate 130, each partition plate 200, the upper cover plate 120 and the lower base plate 130 form an "i" shaped structure, so that the overall case body 100 of the battery pack 10 is in a honeycomb structure, which has high strength and rigidity, thereby meeting the requirements of the case body 100 for bearing, impact resistance, extrusion resistance and the like. Further, the structure of the box main body 100 is relatively simple and space utilization 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 the light weight of the whole vehicle of the electric vehicle can be met, and the design and manufacturing cost of the whole vehicle can be reduced.

In the embodiment of the present application, as shown in fig. 12, the pole core string 401 includes a plurality of pole core groups 400 sequentially arranged in the second direction and connected in series. The electrode core set 400 is encapsulated in the encapsulation film 500 (as shown in fig. 23 or 24); the length direction of the pole piece string 401 extends in a second direction, which is the width direction of the case or the length direction of the case. In some embodiments, the second direction is the length direction of the case, i.e., the Z direction as shown in the figures.

The outer side of the case is further provided with a fixing portion 110 for fixedly connecting with an external carrier. The external carrier may be, for example, a chassis of an electric vehicle or the like. It should be noted that, although the outer side surface of the case refers to the outer surface of the case, in the embodiment of the present application, the fixing portion 110 is disposed on the outer side surface of the case, and the distribution box 12 is also disposed on the outer side surface of the case, it is not limited that the distribution box 12 and the fixing portion 110 are both disposed on the same outer side surface of the case, and both may be disposed on outer side surfaces of different positions of the case.

Most of the traditional battery packs are formed by assembling single batteries into a battery module and then assembling the battery module on a box body of the battery pack. The common single battery is that the pole core is arranged in the battery shell and is packaged by the cover plates at the two ends, then a plurality of single batteries are fixed together by utilizing fixing structures such as end plates, side plates and connecting sheets, so that a battery module is assembled, the battery module is assembled on the box body of the battery pack 10, the design structure of the conventional battery pack is complex, the assembly efficiency is very low, the types of parts are multiple, the cost of the parts is high, and the assembly cost is also high.

In the embodiment of the application, the pole core group 400 is encapsulated in the encapsulation film 500, the plurality of pole core groups 400 are connected in series to form the pole core string 401, and the pole core string 401 is directly arranged in the box body of the battery pack 10, so that double sealing is realized through the encapsulation film 500 and the box body of the battery pack 10, and the sealing effect is improved; therefore, the pole core string 401 is directly arranged in the box body of the battery pack 10, so that the fixing structure (such as an end plate, a side plate, a connecting sheet and the like) of the battery shell and the battery module of the single battery in the prior art can be omitted, the space utilization rate of the battery pack 10 can be improved, the weight of the battery pack 10 is lightened, the energy density of the battery pack 10 is improved, the battery pack 10 has a simple structure and high assembly efficiency, and the production cost is reduced; furthermore, in the sub-case of the battery pack 10, the partition board 200 is located between the upper cover plate 120 and the lower bottom plate 130, and the partition board 200 is connected to the upper cover plate 120 and the lower bottom plate 130, so that the partition board 200, the upper cover plate 120 and the lower bottom plate 130 form an I-shaped structure, and the structure has higher strength and rigidity, thereby meeting the requirements of the performances of bearing, anti-collision, anti-extrusion and the like of the case of the battery pack 10. Secondly, the structure of the box body of the battery pack 10 is simpler, the manufacturing cost is lower, and the space utilization rate is higher. In addition, the division plate 200 divides the sub-case into the plurality of accommodating chambers 300, and when thermal runaway occurs in the pole core string 401 in one of the accommodating chambers 300, the pole core string 401 in the other accommodating chamber 300 is not affected, so that the safety of the operation of the battery pack 10 can be improved. In addition, 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 the light weight of the whole electric vehicle can be met, and the design and manufacturing cost of the whole vehicle can be reduced.

In the embodiment of the present application, referring to fig. 6 and 7, the sub-box 101 has a first end and a second end opposite to each other along the second direction Z, at least one of the first end and the second end of the sub-box 101 is provided with an opening 180, and the pole core string 401 can be mounted in the accommodating cavity 300 through the opening 180. Wherein the case further includes end plates 112 closing the openings, each opening 180 corresponding to at least one end plate 112. As shown in fig. 6, each opening 180 of each sub-tank 101 may correspond to one end plate 112, and each opening 180 is closed by one end plate 112, so that only the end plate 112 corresponding to the opening 180 of the sub-tank 101 needs to be removed for replacement or repair, thereby simplifying the operation. Alternatively, each opening 180 may be a corresponding plurality of end plates 112, that is, the plurality of end plates 112 collectively close one opening 180 of the sub-tank 101.

It should be noted that, when the sub-tank 101 is provided with the opening 180 only at the first end or the second end, the sub-tank 101 has one opening 180 at this time, and when the sub-tank 101 is provided with the openings 180 at both the first end and the second end, the sub-tank 101 has two openings 180 at this time, i.e., the number of the openings 180 corresponds to the end.

As shown in fig. 7, when the number of the sub-tanks 101 is plural, the plurality of end plates 112 located at the same end of the tank main body 100 in the second direction Z are integrally formed, that is, when there are plural sub-tanks 101, the openings 180 at the same end of the sub-tanks 101 in the second direction Z are closed by sharing the same end plate. Thus, the machining of the end plate 112 can be simplified, which is advantageous in saving costs.

The manner in which the end plate 112 seals the opening 180 of the sub-tank 101 is not particularly limited, for example, the end plate 112 is welded with the sub-tank 101 to close the opening 180 of the sub-tank 101; alternatively, the end plate 112 is adhered to the sub-tank 101 to close the opening 180 of the sub-tank 101; alternatively, the end plate 112 is riveted or screwed with the sub-tank 101, and a gasket is provided between the end plate 112 and the sub-tank 101 to close the opening 180 of the sub-tank 101.

The first end and the second end of the sub-tank 101 along the second direction Z may be provided with openings 180, and each opening 180 is closed by at least one end plate 112.

Referring to fig. 8 and 9, in some embodiments of the present application, the outer housing 121 of the distribution box 12 includes a base 1211, a cylindrical body 1212 with two ends open, and a housing cover 1213. Wherein, the base 1211 covers one end opening of the cylindrical body 1212, and the cover 1213 covers the other end opening of the cylindrical body 1212, so that the base 1211, the cylindrical body 1212 and the cover 1213 together enclose a containing space of the outer housing 121, the power distribution assembly 122 is located in the containing space, and the outer housing 121 is fixed with the box body through the base 1211, that is, the base 1211 is fixed on the box body.

Further, the base 1211 is fixed to the end plate 112 corresponding to the opening 180 of the first end or the second end of the sub-box 101 along the second direction, as shown in fig. 7, the end plates 112 corresponding to the openings 180 of the first ends of the plurality of sub-boxes 101 are integrally formed, and the base 1211 is fixed to the end plate 112 at the opening of the first end of the sub-box 101, thereby fixing the distribution box 12 on the outer side surface of the box.

In some embodiments, as shown in fig. 3, 6 and 7, the battery pack 10 further includes a plurality of insulating holders 600, the insulating holders 600 being located inside the end plates 112, and the insulating holders 600 being provided at the openings 180 of the first ends and/or the second ends of the sub-housings 101 along the second direction Z. The two pole core groups 400 located at the same end of the sub-box 101 in the second direction Z and respectively located in the adjacent two accommodating chambers 300 are electrically connected through the first conductive member 440, and the first conductive member 440 is fixed on the insulating bracket 600. Thus, when overhauling or replacing, only the insulating bracket 600 corresponding to the sub-housing 101 needs to be removed, thereby simplifying the operation. Also, each of the insulating holders 600 may serve as a fixed support and insulation for the first conductive member 440 disposed thereon.

In some embodiments, each sub-tank 101 is provided with an insulating holder 600 at the opening 180 of the first end or the second end in the second direction Z.

The inside of the end plate 112 is understood to mean the side of the end plate 112 that is adjacent to the pole core group 400. The first conductive member 440 is a connecting piece, but it can be other shapes, such as a pillar shape.

In a further embodiment, as shown in fig. 3 and 7, a plurality of insulating holders 600 located at the same end of the box body 100 in the second direction Z are integrally formed. That is, the plurality of insulating holders 600 at the first end of the tank body 100 are integrally formed, and/or the plurality of insulating holders 600 at the second end of the tank body 100 are integrally formed. By such arrangement, the processing of the insulating bracket 600 can be simplified, which is beneficial to saving 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 group 400. As shown in fig. 13, the pole core group 400 includes a first electrode lead-out part 410 and a second electrode lead-out part 420 for leading out current, and the first electrode lead-out part 410 and the second electrode lead-out part 420 are distributed on opposite sides of the pole core group 400 in the second direction.

The first electrode lead-out member 410 of one pole core group 400 of the two pole core groups 400 located on the same side and adjacent to the opening 180 in the adjacent two accommodating chambers 300 is electrically connected with the first electrode lead-out member 410 of the other pole core group 400 through the insulating support 600 and the first conductive member 440 and through the first conductive member 440, so that the parallel connection of the pole core groups 400 of the adjacent two accommodating chambers 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 second electrode lead-out member 420 of one pole core group 400 of the two pole core groups 400 located on the same side and adjacent to the opening 180 in the two adjacent accommodating chambers 300 is electrically connected with the second electrode lead-out member 420 of the other pole core group 400 through the insulating support 600 and the first conductive member 440 and through the first conductive member 440, so as to realize parallel connection of the pole core groups 400 of the two adjacent accommodating chambers 300, and the connection path of the connection manner is relatively short, which is beneficial to reduce the internal resistance.

In other embodiments, the first electrode lead-out member 410 of one pole core group 400 of the two pole core groups 400 located on the same side and adjacent to the opening 180 in the two adjacent accommodating chambers 300 is electrically connected with the second electrode lead-out member 420 of the other pole core group 400 through the insulating support 600 and the first conductive member 440 and through the first conductive member 440, so as to realize the series connection of the pole core groups 400 of the two adjacent accommodating chambers 300, and the connection path of the connection manner is relatively short, which is beneficial to reduce the internal resistance.

In a further embodiment, the battery pack 10 further includes a plurality of insulation protection caps 700, and the insulation protection caps 700 are disposed between the insulation support 600 and the end plates 112. The insulation 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 part 410 or the second electrode lead-out part 420 from being damaged, and also prevent the first conductive member 440 from being in contact with other metal members to cause short circuit.

In a further embodiment, the plurality of insulation protection covers 700 located at the same end of the case body 100 in the second direction are integrally formed. That is, the plurality of insulation protection caps 700 at the first end of the case body 100 are integrally formed, and/or the plurality of insulation protection caps 700 at the second end of the case body 100 are integrally formed. With this arrangement, the processing of the insulation protection cover 700 can be simplified, which is beneficial to saving the cost.

In some embodiments of the present application, the energy storage assembly formed by electrically connecting the plurality of pole core strings 401 has an electrode lead-out terminal that draws current, the electrode lead-out terminal comprising a total positive terminal and a total negative terminal, and the power distribution assembly 122 comprises an input terminal comprising a positive input and a negative input. The first interface group is disposed on the case and electrically connected to the electrode lead-out terminal of the energy storage component, and the first interface group may specifically be disposed on the end plate 112 of the case, as shown in fig. 7, where the first interface group on the end plate 112 includes a total positive interface 1121 and a total negative interface 1122, and the total positive interface 1121 and the total negative interface 1122 are electrically connected to a total positive terminal and a total negative terminal of the energy storage component, respectively.

As shown in fig. 8, the outer housing 121 is provided with a second interface group electrically connected to the input terminal of the power distribution assembly 122, which may specifically be provided on the base 1211 of the outer housing 121, and the second interface group also includes a total positive interface 1214 and a total negative interface 1215, where the total positive interface 1214 and the total negative interface 1215 of the second interface group are electrically connected to the positive input terminal and the negative input terminal of the power distribution assembly, respectively.

The total positive interface 1121 and the total negative interface 1122 of the first interface group are electrically connected with the total positive interface 1214 and the total negative interface 1215 of the second interface group, respectively, so as to electrically connect the distribution box 12 with the energy storage component, that is, electrically connect the distribution box 12 with the pole core string 401.

In addition, a sampling component is further disposed in the sub-box 101, and the sampling component is mainly used for collecting information such as voltage, temperature, current and the like of the pole core string 401, and may include a plurality of battery information collectors (Battery Information Collector, BIC), for example, may include a voltage information collector, a temperature information collector and the like. The sampling assembly may be disposed on the first conductive member 440, for example. The distribution box 12 also includes a battery management system (Battery Management System, BMS) disposed within the outer housing 121, which may be integrated with the distribution assembly 122 as a module, for example, with the sampling assembly electrically connected to the battery management system.

Still further, the first interface group may further comprise a sampling interface 1123, the sampling interface 1123 being electrically connected to the sampling assembly, and the second interface group may further comprise a sampling interface 1216, the sampling interface 1216 being electrically connected to the battery management system, wherein the sampling interface 1123 of the first interface group and the sampling interface 1216 of the second interface group are electrically connected to thereby enable the electrical connection of the sampling assembly to the battery management system.

It will be appreciated that the power distribution assembly 122 further includes output terminals including a positive output terminal and a negative output terminal, and the battery management system also includes a sampling signal output terminal, wherein, as shown in fig. 3, a positive output interface 1217, a negative output interface 1218, and a sampling output interface 1219 are further provided on the cover 1213 of the outer housing 121, the positive output interface 1217 and the negative output interface 1218 are electrically connected to the positive output terminal and the negative output terminal of the power distribution assembly 122, respectively, and the sampling output interface 1219 is electrically connected to the sampling signal output terminal of the battery management system.

The first interface group may be configured as a male plug, for example, and the second interface group may be configured as a female plug, for example, so that when the distribution box 12 is mounted on the box body, only the corresponding interfaces of the first interface group and the second interface group need to be plugged together to realize electrical connection, so that the installation is convenient.

In other embodiments, the energy storage assembly and the distribution box 12 may also be electrically connected by wires. Specifically, the battery pack 10 may further include connection leads. The energy storage assembly formed by the plurality of pole core strings 401 being electrically connected has an electrode lead-out terminal that draws current, the electrode lead-out terminal comprising a total positive terminal and a total negative terminal, and the power distribution assembly 122 comprises an input terminal comprising a positive input and a negative input. Wherein, a first through hole may be provided on the end plate 112 of the case, a second through hole may be provided on the base 1211 of the outer case 121, and a connection wire sequentially passes through the first through hole and the second through hole to correspondingly electrically connect the electrode lead-out terminal of the energy storage assembly and the input terminal of the power distribution assembly 122.

Referring to fig. 10 and 11, in other embodiments of the present application, the outer housing of the distribution box 12 may have other structures, for example, as shown in fig. 10, the outer housing 121 includes a base 1211 'and a cover 1212', where the cover 1212 'is a groove structure, the base 1211' is fixed with the cover 1212 'to cover the groove opening of the cover 1212', the distribution assembly 122 is located in a receiving space enclosed by the base 1211 'and the cover 1212', and the outer housing 121 is fixed with the box through the base 1211', and specifically, the base 1211' may be fixed on the end plate 112. Wherein, the side of cover 1212' facing end plate 112 may be open to facilitate electrical connection of power distribution assembly 122 to the energy storage assembly.

In some embodiments, the electrode lead-out terminals of the energy storage assembly and the distribution box 12 are located at the same end of the box body along the second direction, so as to electrically connect the motor lead-out terminals with the distribution box 12, thereby simplifying the circuit. Of course, in other embodiments, the electrode lead-out terminals of the energy storage assembly and the distribution box 12 may be located at different ends of the box, and the electrode lead-out terminals and the distribution box 12 may be electrically connected by wires.

Referring to fig. 4 to 5, when the number of the sub-tanks 101 is plural, the plural sub-tanks 101 are connected, and the plural sub-tanks 101 are sequentially arranged in the third direction Y. Further, the case further includes a first frame 140 and a second frame 150 distributed on opposite sides of the case body 100 in the third direction.

Specifically, the case includes a case body 100 and first and

second rims

140 and 150 positioned at both sides of the case body 100, and the case body 100 includes a plurality of sub-cases 101, each sub-case 101 including an upper cover plate 120 and a lower base plate 130 disposed opposite to each other in a first direction.

The sub-boxes 101 located at two ends of the third direction Y in the plurality of sub-boxes 101 are end sub-boxes, one of the two end sub-boxes is connected with the first frame 140, and the other is connected with the second frame 150. The first sub-tank 101 and the last sub-tank 101 in the Y direction in fig. 4 are end sub-tanks, respectively.

Further, the end sub-tank connected to the first frame 140 is integrally formed with the first frame 140, and the end sub-tank connected to the second frame 150 is integrally formed with the second frame 150. Thus, the processing technology can be simplified, the cost can be reduced, and the structure strength can be ensured.

Specifically, at least one of the upper cover plate 120 and the lower bottom plate 130 of the end sub-tank connected to the first frame 140 is integrally formed with the first frame 140, and at least one of the upper cover plate 120 and the lower bottom plate 130 of the end sub-tank connected to the second frame 150 is integrally formed with the second frame 150. For example, the integral aluminum profile is extruded.

However, in other embodiments, the end sub-tank connected to the first frame 140 and the first frame 140 are integrally formed, and the end sub-tank connected to the second frame 150 and the second frame 150 are connected by direct or indirect means. Alternatively, the end sub-tank connected to the second frame 150 and the second frame 150 are integrally formed, and the end sub-tank connected to the first frame 140 and the first frame 140 are connected by direct or indirect means.

In some embodiments, as shown in fig. 4 and 5, the first and

second frames

140 and 150 have a cavity therein, and a reinforcing plate 141 is disposed in the cavity, and the reinforcing plate 141 divides the cavity into a plurality of subchambers. By such arrangement, the first and

second frames

140 and 150 can be ensured to have a certain structural strength, thereby being beneficial to improving the impact and extrusion resistance strength of the battery pack 10. However, in other embodiments, the first bezel 140 or the second bezel 150 has a cavity inside.

In addition, the case main body 100 may further include a connection plate 142, the connection plate 142 being connected between two adjacent sub-cases 101. The connection mode is not particularly limited in the present application, and may be a detachable connection, such as bolting, riveting, etc.; or a non-detachable connection such as welding, adhesive, etc.

Further, the connecting plate 142 has a cavity therein, and the cavity is provided with a reinforcing rib 143 therein, and the reinforcing rib 143 divides the cavity into a plurality of subchambers. By this arrangement, the structural strength of the connection plate 142 can be increased, and the connection reliability of the two sub-housings 101 can be improved.

The fixing portion 110 of the box body may be specifically disposed on the first frame 140 and the second frame 150, that is, the fixing portion 110 is disposed on each of the first frame 140 and the second frame 150, and the fixing portion 110 is fixed with an external carrier. As shown in fig. 3, the fixing portion 110 is a mounting hole provided on the first and

second frames

140 and 150, and the mounting hole is used for a fastener (such as a bolt or a rivet) to pass through to connect and fix the battery pack 10 to an external carrier.

Specifically, the fixing portion 110 disposed on the first frame 140 penetrates the first frame 140 in the first direction, and the fixing portion 110 disposed on the second frame 150 penetrates the second frame 150 in the first direction. However, the axial direction of the fixing portion 110 may be disposed at an angle to the first direction, for example, 5 ° or 10 °. Further, the fixing portion 110 is provided with a plurality of fixing portions 110, and the fixing portions 110 disposed on 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.

Also, the fixing portions 110 provided 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 fixing portion 110 may also be a hanging ring disposed on the first frame 140 and the second frame 150. The suspension ring is fixedly connected with the vehicle body to fixedly connect the battery pack 10 to an external carrier.

However, in another embodiment, the fixing portion 110 is a mounting block provided on the first and

second frames

140 and 150, and the mounting block may be fixed to the vehicle body by welding. Of course, the mounting blocks may also be secured to the external carrier by gluing or clamping.

Of course, in other embodiments, the fixing portion 110 may be disposed on the upper cover 120 or the lower base 130.

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-2500mm. By such design, the length of the pole core string 401 arranged in the accommodating cavity 300 can be longer, so that more pole core groups 400 can be accommodated, and the battery pack 10 can meet the requirements of larger capacity and higher space utilization.

Further, the length of the receiving chamber 300 in the second direction is 1000mm to 2000mm.

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

In some embodiments, as shown in fig. 12, the length of the pole core string 401 is greater than 400mm, further the length of the pole core string 401 is 400mm-2500mm. Further, the length of the pole core string 401 is 1000mm-2000 mm. Further, the length of the pole core string 401 is 1300mm-2200mm. It will be appreciated that providing a plurality of pole core groups 400 in series within the receiving cavity 300 to form a pole core string 401 may reduce the internal resistance compared to providing only one pole core group 400 of the same length as the pole core string 401. Because, once the pole core group 400 is longer, the length of the copper aluminum foil used as the current collector will be correspondingly increased, so that the internal resistance is greatly improved, the current requirements of higher and higher power and quick charging cannot be met, and the above problems can be avoided by adopting the mode of connecting a plurality of pole core groups 400 in series.

Referring to fig. 12 and 14, in a further embodiment, the pole core groups 400 include a first electrode lead-out part 410 and a second electrode lead-out part 420 for leading out current, the first electrode lead-out part 410 and the second electrode lead-out part 420 are distributed on opposite sides of the pole core groups 400 along a second direction, and the first electrode lead-out 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 lead-out part 420 of the other pole core group 400 so as to connect the two adjacent pole core groups 400 in series. That is, the plurality of pole core groups 400 forming the pole core string 401 are arranged in a head-to-head manner, and the arrangement manner can conveniently realize the serial connection of the pole core groups 400, and the connection structure is simple.

In some embodiments, as shown in fig. 3, a plurality of pole core strings 401 are disposed in the accommodating cavity 300, and the plurality of pole core strings 401 are sequentially arranged and electrically connected along the thickness direction of the pole core group 400, and the thickness direction of the pole core group 400 is parallel to the third direction Y. In this way, more pole core strings 401 can be arranged in the accommodating cavity 300 to meet the requirement of actual use.

In the following, a few cases of electrically connecting a plurality of pole core strings 401 in the same housing cavity 300 will be specifically described, but it should be noted that the following description is merely illustrative, and embodiments of the present application are not limited thereto:

referring to fig. 15 and 16, in a further embodiment, a plurality of pole strings 401 within the same receiving cavity 300 are connected in series.

A first pole core group 400 of one pole core string 401 of the adjacent two pole core strings 401 is electrically connected with a 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 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. 15 and 16, the leftmost pole core group 400 in the two pole core strings 401 is the first pole core group 400, and the rightmost pole core group 400 is the last pole core group.

Further, the first electrode lead-out part 410 of the first pole core group 400 of one pole core string 401 of the adjacent two pole core strings 401 is located at 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. 15). Alternatively, the second electrode lead-out member 420 of the last pole core group 400 of one pole core string 401 of the adjacent two 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. 16).

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

Referring to fig. 17, in a further embodiment, a plurality of pole core strings 401 within the same housing 300 are connected in parallel.

A first pole core group 400 of one pole core string 401 of the adjacent two pole core strings 401 is electrically connected with a first pole core group 400 of the other pole core string 401, and a last pole core group 400 of the one pole core string 401 of the adjacent two pole core strings 401 is electrically connected with a last pole core group 400 of the other pole core string 401. As shown in fig. 13, the leftmost pole core group 400 in the two pole core strings 401 is the first pole core group 400, and the rightmost pole core group 400 is the last pole core group.

Further, the first electrode lead-out part 410 of the first pole core group 400 of one pole core string 401 of the adjacent two pole core strings 401 is located at the same side as the first electrode lead-out part 410 of the first pole core group 400 of the other pole core string 401, and the second electrode lead-out part 420 of the last pole core group 400 of the one pole core string 401 of the adjacent two pole core strings 401 is located at the same side as the second electrode lead-out 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 reduction of internal resistance is facilitated. In other embodiments, other parallel connections may be used.

Further, the following describes in detail several cases of electrically connecting the pole core strings 401 of two adjacent receiving cavities 300, which should be noted that the following descriptions are only examples, and the embodiments of the present application are not limited thereto:

referring to fig. 18, in a further embodiment, the pole core strings 401 in adjacent two 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 adjacent two receiving cavities 300 is electrically connected with the first pole core group 400 of one of the pole core strings 401 in the other receiving cavity 300; alternatively, the last pole core group 400 of one of the pole core strings 401 in one of the adjacent two receiving cavities 300 is electrically connected with the last pole core group 400 of one of the pole core strings 401 in the other receiving cavity 300. In fig. 18, 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 piece group 400 of the pole piece string 401 is the rightmost pole piece group 400, and the last pole piece group 400 of the pole piece string 401 is the leftmost pole piece group 400. In fig. 18, there is shown a case where three pole-core strings 401 are included in each housing chamber 300, and two pole-core strings 401 in the two housing chambers 300, which are closest in spaced position, are electrically connected; in other embodiments, where 1 or a different number of pole strings 401 is included in the accommodating cavity 300, when a plurality of pole strings 401 is included in the accommodating cavity 300, the first pole string 401 of one accommodating cavity 300 in the third direction may be electrically connected to the second pole string 401 of the other accommodating cavity 300 in the third direction, that is, not the two pole strings 401 closest to each other in the two accommodating cavities 300 may be electrically connected.

In a further embodiment, the first electrode lead-out part 410 of the first one of the pole core strings 401 in one of the adjacent two receiving cavities 300 is located on the same side as the second electrode lead-out part 420 of the first one of the pole core strings 400 in the other receiving 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 adjacent two accommodation chambers 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 accommodation chamber 300.

The series connection between the pole core strings 401 in the adjacent two accommodating chambers 300 by adopting the connection mode can make the path of electrical connection shorter, which is beneficial to reducing the internal resistance. In other embodiments, other series connections may be used.

In some preferred embodiments, two adjacent containment cavities 300 are defined as a first containment cavity 300 and a second containment cavity 300, respectively, with one pole string 401 disposed adjacent to the second containment cavity 300 within the first containment cavity 300 being connected in series with one pole string 401 disposed adjacent to the first containment cavity 300 within the second containment cavity 300.

Further, 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 with 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 cavity 300 within the first receiving cavity 300 is electrically connected with the last pole core group 400 of one pole core string 401 disposed adjacent to the first receiving cavity 300 within the second receiving cavity 300.

It can be appreciated that the above connection method can make the path of electrical connection shorter, which is beneficial to reduce internal resistance.

Referring to fig. 19, in a further embodiment, the pole core 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 adjacent two accommodating chambers 300 is electrically connected with the first pole core group 400 of one of the pole core strings 401 in the other accommodating chamber 300, and the last pole core group 400 of one of the pole core strings 401 in one of the adjacent two accommodating chambers 300 is electrically connected with the last pole core group 400 of one of the pole core strings 401 in the other accommodating chamber 300. In fig. 19, 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 piece group 400 of the pole piece string 401 is the rightmost pole piece group 400, and the last pole piece group 400 of the pole piece string 401 is the leftmost pole piece group 400.

Further, the first electrode lead-out member 410 of the first pole core group 400 of one of the pole core strings 401 in one of the adjacent two accommodation cavities 300 is located on the same side as the first electrode lead-out member 410 of the first pole core group 400 of one of the pole core strings 401 in the other accommodation cavity 300, and the second electrode lead-out member 420 of the last pole core group 400 of one of the pole core strings 401 in one of the adjacent two accommodation 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 accommodation cavity 300.

The parallel connection between the pole core strings 401 in the adjacent two accommodating chambers 300 by adopting the connection mode can make the electrical connection path shorter, and is beneficial to reducing the internal resistance. In other embodiments, other parallel connections may be used.

Preferably, two adjacent accommodating chambers 300 are defined as a first accommodating chamber 300 and a second accommodating chamber 300, respectively, and one pole piece string 401 disposed adjacent to the second accommodating chamber 300 in the first accommodating chamber 300 is connected in parallel with one pole piece string 401 disposed adjacent to the first accommodating chamber 300 in the second accommodating chamber 300.

Specifically, the first pole core group 400 of one pole core string 401 disposed adjacent to the second accommodating cavity 300 in the first accommodating cavity 300 is electrically connected with the first pole core group 400 of one pole core string 401 disposed adjacent to the first accommodating cavity 300 in the second accommodating cavity 300, and the last pole core group 400 of one pole core string 401 disposed adjacent to the second accommodating cavity 300 in the first accommodating cavity 300 is electrically connected with the last pole core group 400 of one pole core string 401 disposed adjacent to the first accommodating cavity 300 in the second accommodating cavity 300. It can be appreciated that the above connection method can make the path of electrical connection shorter, which is beneficial to reduce internal resistance.

As for each of the accommodating chambers 300, one of the pole core strings 401 is provided, and the pole core strings 401 of two adjacent accommodating chambers 300 are electrically connected in a similar manner to the above manner, only a brief description will be given below:

in some embodiments, as shown in fig. 20, 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 in the following manner: a first pole core group 400 of a pole core string 401 in one of the adjacent two receiving cavities 300 is electrically connected to a first pole core group 400 of a pole core string 401 in the other receiving cavity 300; alternatively, the last pole core group 400 of the pole core string 401 in one of the adjacent two 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. 20, 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 piece group 400 of the pole piece string 401 is the rightmost pole piece group 400, and the last pole piece group 400 of the pole piece string 401 is the leftmost pole piece group 400.

In some embodiments, as shown in fig. 21, only one pole core string 401 is disposed in the accommodating cavity 300, where the pole core groups 400 in two adjacent accommodating cavities 300 are connected in parallel in the following manner: a first pole core group 400 of a pole core string 401 in one of the adjacent two receiving cavities 300 is electrically connected to a first pole core group 400 of a pole core string 401 in the other receiving cavity 300, and a last pole core group 400 of a pole core string 401 in one of the adjacent two receiving cavities 300 is electrically connected to a last pole core group 400 of a pole core string 401 in the other receiving cavity 300. In fig. 21, 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 piece group 400 of the pole piece string 401 is the rightmost pole piece group 400, and the last pole piece group 400 of the pole piece string 401 is the leftmost pole piece group 400.

Referring to fig. 13 and 14 again, in a further embodiment, the pole core assembly 400 includes a pole core assembly main body 430, and a first electrode lead-out component 410 and a second electrode lead-out component 420 for leading out current, wherein the first electrode lead-out component 410 and the second electrode lead-out component 420 are distributed on two opposite sides of the pole core assembly main body 430 along a second direction, and the first electrode lead-out component 410 of one pole core assembly 400 and the second electrode lead-out component 420 of the other pole core assembly 400 in two adjacent pole core assemblies 400 forming the pole core string 401 are electrically connected through a second conductive piece 460;

a fixed spacer 450 is arranged between the pole core group main bodies 430 of the two adjacent pole core groups 400, and the second conductive piece 460 is fixed in the fixed spacer 450; the structure glue is filled between the pole core group main bodies 430 of the adjacent two pole core groups 400 and the fixed space ring 450, so that the plurality of pole core groups 400 can be connected into a whole through the structure glue, thereby improving the structural strength of the pole core string 401 and facilitating the installation of the pole core string 401 in the accommodating cavity 300.

The fixed spacer 450 includes a first spacer 453 and a second spacer 454 which are disposed opposite to each other along a third direction, and the second conductive member 460 is disposed between the first spacer 453 and the second spacer 454, and the first spacer 453 is connected to the second spacer 454 to clamp and fix the second conductive member 460 so as to prevent play between the pole core groups 400.

In this embodiment, a plug 451 is provided on one of the surfaces of the first and

second spacers

453 and 454 facing the second conductive member 460, a receptacle 452 is provided on the other of the first and

second spacers

453 and 454, and the first and

second spacers

453 and 454 are inserted into the receptacle 452 through the plug 451 to be fixedly connected and sandwich the second conductive member 460 therebetween.

Referring to fig. 23, in a further embodiment, a plurality of pole piece groups 400 comprising a pole piece string 401 are encapsulated in an encapsulation film 500; the electrode core set 400 includes a electrode core set main body 430 and a first electrode lead-out part 410 and a second electrode lead-out part 420 for leading out current, and a junction of the first electrode lead-out part 410 of one electrode core set 400 and the second electrode lead-out part 420 of the other electrode core set 400 of the two electrode core sets 400 connected in series is located in the encapsulation film 500; the encapsulation film 500 is formed with an encapsulation part 510 at a position opposite to the first electrode lead-out part 410 and/or the second electrode lead-out part 420 to isolate the adjacent two-pole core pack main body 430.

The packaging part 510 isolates the plurality of pole core groups 400, so that the mutual circulation of electrolyte among the plurality of pole core groups 400 is avoided, the plurality of pole core groups 400 cannot be affected with each other, the electrolyte in the plurality of pole core groups 400 cannot be decomposed due to overlarge potential difference, and the safety and the service life of the battery are ensured.

The package portion 510 may be formed by various embodiments, for example, the package film 500 may be fastened by a tie to form the package portion 510, or the package film 500 may be directly thermally fused to form the package portion 510. The specific manner of the encapsulation portion 510 is not particularly limited.

In the present application, the sealing material used for the preferred packaging film 500 is a PET and PP composite film or an aluminum plastic film. The polar core group 400 expands after being formed by capacity division, and in this application, it is preferable to pump negative pressure to the cavity inside the packaging film 500 to restrict the polar core group 400, so that there is a requirement for air tightness of the accommodating cavity 300 inside the packaging film 500.

Referring to fig. 24, in other embodiments, each pole piece 400 is encapsulated in an encapsulation film 500 to form pole piece 400 pieces, and the pole piece 400 pieces are connected in series.

In other words, the number of the packaging films 500 corresponds to the number of the pole core groups 400 one by one, each pole core group 400 is individually packaged in one packaging film 500, in this embodiment, after the preparation of a plurality of pole core groups 400 is completed, one packaging film 500 can be individually sleeved 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 accommodating chamber 300 is lower than the air pressure outside the tank main body 100. The vacuum pumping treatment can be performed inside the accommodating cavity 300, so that the air pressure of the accommodating cavity 300 is lower than the air pressure outside the shell 100, after the accommodating cavity 300 is vacuumized, the storage amount of substances such as water vapor, oxygen and the like in the box main body 100 can be reduced, the long-time aging effect of the water vapor and the oxygen on the pole core group 400 and each part in the box main body 100 is avoided, and the service life of the pole core group 400 or each part inside the shell 100 is prolonged.

In a further embodiment, the tank body 100 is provided with an air suction hole. The number of the air extraction holes can be one or more, and the air extraction holes can be arranged at the position of the top cover plate 120 or the bottom plate 130 corresponding to the accommodating cavity 300, or arranged on the first frame 140 and the second frame 150.

In a further embodiment, the case body 100 is provided with glue injection holes 102 (as shown in fig. 3), each receiving cavity 300 is correspondingly communicated with at least one glue injection hole 102, and the glue injection holes 102 are used for filling glue into the corresponding receiving cavities 300 so as to fixedly connect the pole core groups 400 with the case body 100. The electrode core set 400, the box body 100 and the partition plate 200 can be fixedly connected together in a potting manner by using the hollow glass bead filling glue or the structural glue, so that the structural strength of the battery pack 10 is further improved. In the present embodiment, the glue injection hole 102 is provided on the upper cover 120 of the sub-tank 101. Of course, in other embodiments, the glue injection hole 102 may also be disposed on the bottom plate 130 of the sub-tank 101.

In a further embodiment, as shown in fig. 14, two adjacent pole core groups 400 forming a pole core string 401 are electrically connected through a second conductive member 460, and the glue injection hole 102 is disposed corresponding to the second conductive member 460. By this arrangement, a high connection strength between the pole core groups 400 can be ensured.

In some embodiments, as shown in fig. 2, an explosion-proof valve 800 is provided on the tank body 100, and the explosion-proof valve 800 seals the glue injection hole 102. In this way, the explosion-proof valve 800 can serve as a sealing cover for sealing the glue injection hole 102, and also can play a role in safety and explosion prevention.

In some embodiments, as shown in fig. 3 and 22, the explosion proof valve 800 has a weakened area 803; the explosion-proof valve 800 includes a cover body 802 hermetically connected to the case main body 100 and a boss 801 provided on the cover body 802, the boss 801 protruding toward a side facing away from the pole core group 400, and a weakened area 803 is formed on an outer peripheral wall of the boss 801. In this way, when the pole core group 400 in the battery pack 10 works abnormally to cause excessive gas production, the weak area 803 of the explosion-proof valve 800 is broken by the air pressure, so that the safety accident of the battery pack 10 can be avoided.

Note that the weakened area 803 may be a groove or a score. Alternatively, the weakened area 803 may have a thickness that is less than the thickness of the rest of the explosion proof valve 800.

Further, the glue injection hole 102 is disposed on the upper cover 120, and the cover 802 is hermetically connected to the upper cover 120. The sealing connection is not particularly limited, and for example, the sealing connection may be achieved by welding or gluing.

In some embodiments, as shown in fig. 3, the battery pack 10 further includes a plurality of liquid cooling members 900, where the plurality of liquid cooling members 900 are correspondingly disposed on the lower bottom plate 130 of the plurality of sub-cases 101, and the plurality of liquid cooling members 900 are disposed to cool and dissipate heat of the pole core groups 400. Further, the plurality of liquid cooling members 900 are integrally formed. The arrangement can simplify the processing technology and reduce the cost.

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 fixing part 110. The utility model provides an electric motor car when installing on whole car with this kind of battery package 10, the structural strength of this battery package 10 can regard as whole car structural strength's part to can promote whole car's structural strength, be favorable to realizing electric motor car whole car. And the design requirement of light weight is reduced, and the design and manufacturing cost of the whole vehicle is reduced. In addition, the height of the battery pack 10 of the present application is relatively low, so that the space at the height of the vehicle is not excessively occupied.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In the description of the present specification, reference to the terms "embodiment," "specific embodiment," "example," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. The battery pack is characterized by comprising a box body, a distribution box and a plurality of pole core strings;

the power distribution box comprises an outer shell and a power distribution assembly, wherein the power distribution assembly is positioned in the outer shell, the outer shell is installed on the outer side face of the box, the power distribution assembly is electrically connected with the power storage assembly, the power storage assembly is provided with an electrode leading-out terminal for leading out current, and the electrode leading-out terminal and the power distribution box are positioned at the same end of the box along a second direction;

2. The battery pack according to claim 1, wherein the outer case includes a base, a cylindrical body having both ends open, and a case cover;

the base cover seals one end opening of tube-shape body, the cap cover seals the other end opening of tube-shape body, base, tube-shape body and cap enclose into the accommodation space of shell body jointly, distribution subassembly is located in the accommodation space, the shell body passes through the base and is fixed with the box.

3. The battery pack of claim 1, wherein the outer housing comprises a base and a housing cover, the housing cover is of a groove structure, the base is fixed with the housing cover to cover the groove opening of the housing cover, the power distribution assembly is located in an accommodating space defined by the base and the housing cover, and the outer housing is fixed with the box body through the base.

4. A battery pack according to claim 2 or 3, wherein the sub-case has first and second ends opposite in the second direction, at least one of the first and second ends of the sub-case being provided with an opening, the case further comprising end plates closing the openings, each of the openings corresponding to at least one of the end plates;

the base of the outer shell is fixed on an end plate corresponding to the opening of the first end or the second end of the sub-box.

5. The battery pack according to claim 4, wherein when the number of the sub-cases is plural, a plurality of end plates located at the same end of the case body in the second direction are integrally formed.

6. The battery pack of claim 4, further comprising a plurality of insulating brackets located on the inside of the end plates;

Two pole core groups which are positioned at the opening of the same end of the sub-box body in the second direction and are respectively positioned in two adjacent accommodating cavities are electrically connected through a first conductive piece, and the first conductive piece is fixed on the insulating support.

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

8. The battery pack of claim 1, wherein the power distribution assembly comprises an input terminal;

the box body is provided with a first interface group electrically connected with the electrode leading-out terminal, the outer shell is provided with a second interface group electrically connected with the input terminal, and the first interface group is electrically connected with the second interface group.

9. The battery pack of claim 1, further comprising a connection wire, the power distribution assembly comprising an input terminal;

the box body is provided with a first through hole, the outer shell is provided with a second through hole, and the connecting wire sequentially penetrates through the first through hole and the second through hole to electrically connect the electrode lead-out terminal with the input terminal.

10. The battery pack of claim 8 or 9, further comprising a sampling assembly within the box body, the distribution box further comprising a battery management system within an outer housing of the distribution box, the sampling assembly being electrically connected to the battery management system.

11. The battery pack according to claim 1, wherein the number of the sub-cases is plural, the plural sub-cases are connected, and the plural sub-cases are sequentially arranged in a third direction, the third direction being different from the first direction and the second direction.

12. The battery pack of claim 11, wherein the case further comprises first and second rims disposed on opposite sides of the case body in a third direction;

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;

the sub-boxes positioned at two ends of the third direction in the plurality of sub-boxes are end sub-boxes, one of the two end sub-boxes is connected with the first frame, and the other end sub-box is connected with the second frame.

13. The battery pack of claim 12, wherein the end sub-case connected to the first frame is integrally formed with the first frame and/or the end sub-case connected to the second frame is integrally formed with the second frame.

14. The battery pack of claim 1, wherein the receiving chamber has a length in the second direction of greater than 500mm.

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

16. The battery pack according to claim 15, wherein a plurality of the pole core strings are provided in the accommodation chamber, the plurality of pole core strings are sequentially arranged and electrically connected in a thickness direction of a pole core group, 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.

17. The battery pack of claim 16, wherein a plurality of the pole strings within the same receiving cavity are connected in series or in parallel;

When a plurality of pole core strings in the same accommodating cavity are connected in series, a first pole core group of one pole core string in two adjacent pole core strings is electrically connected with a first pole core group of the other pole core string; 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;

when a plurality of pole core strings in the same accommodating cavity are connected in parallel, a first pole core group of one pole core string in two adjacent pole core strings is electrically connected with a first pole core group of the other pole core string, and a last pole core group of one pole core string in two adjacent pole core strings is electrically connected with a last pole core group of the other pole core string.

18. The battery pack of claim 16, wherein the strings of pole pieces in adjacent two of the receiving chambers are connected in series or in parallel;

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

When the pole core strings in the adjacent two accommodating cavities are connected in parallel, the first pole core group of one pole core string in one of the adjacent two accommodating cavities is electrically connected with the first pole core group of one pole core string in the other accommodating cavity, and the last pole core group of one pole core string in one of the adjacent two accommodating cavities is electrically connected with the last pole core group of one pole core string in the other accommodating cavity.

19. The battery pack of claim 15, wherein a pole 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 adjacent two accommodating cavities are connected in series, the first pole core group of the pole core string in one of the adjacent two 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 of the adjacent two accommodating cavities is electrically connected with the last pole core group of the pole core string in the other accommodating cavity;

when the pole core groups in the adjacent two accommodating cavities are connected in parallel, the first pole core group of the pole core string in one of the adjacent two accommodating cavities is electrically connected with the first pole core group of the pole core string in the other accommodating cavity, and the last pole core group of the pole core string in the one of the adjacent two accommodating cavities is electrically connected with the last pole core group of the pole core string in the other accommodating cavity.

20. The battery pack according to 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 pole core group and the second electrode lead-out part of the other pole core group in two adjacent pole core groups are electrically connected through a second conductive piece;

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

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

21. The battery pack of claim 1, wherein the plurality of pole core groups that make up a pole core string are encapsulated in one encapsulation film; the electrode core group comprises an electrode core group main body, a first electrode lead-out part and a second electrode lead-out part, wherein the first electrode lead-out part and the second electrode lead-out part are used for leading out current, and the joint of the first electrode lead-out part of one electrode core group and the second electrode lead-out part of the other electrode core group in the two electrode core groups which are connected in series is positioned in the packaging film; and a packaging part is formed at the relative position of the packaging film and the first electrode leading-out part and/or the second electrode leading-out part so as to isolate adjacent two-pole core group bodies.

22. The battery pack of claim 1, wherein each of the pole pieces is individually encapsulated within an encapsulation film to form pole piece assemblies, the pole piece assemblies being connected in series.

23. The battery pack according to claim 1, wherein the case body is provided with glue injection holes communicated with the accommodating cavities, each accommodating cavity corresponds to at least one glue injection hole, and the glue injection holes are used for filling glue into the corresponding accommodating cavities so as to fixedly connect the pole core groups with the case body.

24. The battery pack according to claim 1, wherein a plurality of partition plates are provided in the sub-case, the plurality of partition plates are arranged at intervals in a third direction, a length of each of the partition plates extends in a second direction, the third direction is different from the first direction and the second direction, the plurality of partition plates are connected between an upper cover plate and a lower base plate, and at least one of the upper cover plate and the lower base plate is integrally formed with the partition plate.

25. An electric vehicle characterized by comprising a vehicle body and the battery pack according to any one of claims 1 to 24, the battery pack being fixed to the vehicle body by the fixing portion.