CN113782902A

CN113782902A - Battery pack and electric vehicle

Info

Publication number: CN113782902A
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: 2021-12-10
Anticipated expiration: 2040-05-22
Also published as: CN113782902B

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 clusters are located the box and are connected the formation energy storage subassembly of electricity each other, and the lateral surface at the box is installed to the block terminal, the block terminal is connected with the utmost point core cluster electricity in the box, in order to realize the distribution function, therefore, through installing the block terminal at the box outside, thereby when the block terminal breaks down or need maintain, need not open the box, can directly operate the block terminal in the box outside, 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 electric vehicle high voltage Distribution box (PDU) is a high voltage Distribution Unit of pure electric vehicles and plug-in hybrid electric vehicles, has the function of ensuring the transmission of Power and electric energy of the whole vehicle system, and is a bridge for transmitting Power and electric signals of Power batteries and high voltage equipment on the whole vehicle. Among the prior art, high tension switchgear places in the battery package box together with power battery usually, seals the processing with battery package box after accomplishing the internal connection of electric lines of battery package box, consequently, when high tension switchgear breaks down or needs to be changed, need open the battery package box, so not only can influence the seal of battery package, and the maintenance is loaded down with trivial details with the change process, and the process is complicated, is not convenient for maintain high tension switchgear.

Disclosure of Invention

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

the plurality of pole core strings are positioned inside the box body and are mutually and electrically connected to form an energy storage assembly, the distribution box comprises an outer shell and a distribution assembly positioned in the outer shell, the outer shell is arranged on the outer side surface of the box body, and the distribution assembly is electrically connected with the energy storage assembly;

the box body comprises a box main body, the box main 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 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;

the pole core string comprises an encapsulation film and a plurality of pole core groups positioned in the encapsulation film, the 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;

and 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 a battery pack as described above, the battery pack being fixed to the vehicle body through the fixing portion.

Compared with the prior art, the beneficial effect that this application has does: the battery pack of this application includes the box, a block terminal and a plurality of utmost point core cluster, a plurality of utmost point core clusters are located the box and are connected the formation energy storage component mutually electrically, and the lateral surface at the box is installed to the block terminal, the block terminal is connected with the utmost point core cluster electricity in the box, in order to realize the distribution function, therefore, through installing the block terminal at the box outside, thereby when the block terminal breaks down or needs to be maintained, need not open the box, can directly operate the block terminal in the box outside, can avoid loaded down with trivial details operation process, be favorable to simplifying the process, be convenient for maintain the block terminal.

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

Drawings

Fig. 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application;

FIG. 2 is a schematic view of the distribution 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 an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a case provided in an embodiment of the present application;

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

fig. 6 is an exploded schematic 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 partial structure of another battery pack according to an embodiment of the present application;

fig. 8 is an exploded schematic view of a distribution box provided by an embodiment of the present application;

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

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

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

fig. 12 is a schematic structural diagram of a pole piece string according to an embodiment of the present application;

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

fig. 15 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. 16 is a schematic structural diagram of two pole core strings connected in series in the same containing cavity according to another embodiment of the present application;

fig. 17 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. 18 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. 19 is a schematic structural diagram of two pole pieces connected in series and in parallel in two accommodating cavities according to an embodiment of the present application;

fig. 20 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. 21 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. 22 is a schematic illustration of an explosion-proof valve according to an embodiment of the present application;

fig. 23 is a schematic structural diagram of an encapsulating film encapsulating a pole core group according to an embodiment of the present application;

fig. 24 is a schematic structural diagram of another encapsulation film encapsulation pole core group provided in 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 body; 102. injecting glue holes; 110. a fixed part; 112. an end plate; 1121. a master 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 shell cover; 1214. a master positive interface; 1215. a total negative interface; 1216. a sampling interface; 1217. a positive output interface; 1218. a negative output interface; 1219. a sampling output interface; 1211' and a base; 1212' and a housing 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. 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. an explosion-proof valve; 801. a boss portion; 802. a cover body; 803. a region of weakness;

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

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference 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 is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present application.

Referring to fig. 1 to 5, in the battery pack 10 according to the embodiment of the present invention, the battery pack 10 includes a case, a power distribution box 12, and a plurality of pole core strings 401. The plurality of pole core strings 401 are located inside the box body, and the plurality of pole core strings 401 are electrically connected with each other to form an energy storage assembly, that is, the power output by the battery pack 10 is derived from the energy storage assembly. The Distribution box 12, i.e., a Power Distribution Unit (PDU), is mainly used for transmitting an electrical signal generated by the Power battery to electrical devices on the electric vehicle. In the embodiment of the present application, as shown in fig. 2, the distribution box 12 includes an outer casing 121 and a distribution assembly 122, the distribution assembly 122 is located in the outer casing 121, the outer casing 121 is installed on an outer side of the box, that is, the distribution box 12 is installed outside the box through the outer casing 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 distribution box 12 and energy storage component, and distribution box 12 is the outside that sets up at the box to when distribution box 12 breaks down or need maintain, need not open the box, can directly operate distribution box 12 in the box outside, can avoid loaded down with trivial details operation process, be favorable to simplifying the process, be convenient for maintain distribution box.

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

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

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

In the embodiment of the present application, the partition plates 200 in the sub-tank 101 are provided in plurality, and the greater the number of the partition plates 200, the greater the number of the receiving cavities 300 formed inside the sub-tank 101. The plurality of partition plates 200 are arranged at intervals in a third direction Y, a length of each partition plate 200 extends in a second direction Z, the plurality of partition plates 200 are connected between the upper cover plate 120 and the lower plate 130, and the third direction Y is different from both the first direction X and the second direction Z, wherein the second direction Z in the drawing is a length direction of the box main body 100, and the third direction Y is a width direction of the box main body 100. In other embodiments, the second direction may also be the width direction of the box main body 100, and the third direction is the length direction of the box main body 100; any two of the first direction, the second direction and the third direction may also be disposed at other angles, for example, 80 ° or 85 °, and the present application is not limited thereto.

A plurality of partition plates 200 may be disposed in each sub-box 101, or a plurality of partition plates 200 may be disposed in a part of sub-box 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 can be 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 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 upper plate 120 and the lower plate 130 is integrally formed with the divider plate 200. So set up, not only processing technology is simple, is favorable to reduction in production cost, but also can guarantee that case main part 100 has sufficient structural strength and rigidity to satisfy the requirement of performance such as the bearing of case main part 100, anti striking and anti extrusion.

Specifically, the upper cover plate 120, the lower base plate 130 and the partition plate 200 are integrally formed. For example, a one-piece aluminum profile extrusion may be used. In another embodiment, the lower plate 130 is integrally formed with the partition plate 200, and then the upper plate 120 is welded to the partition 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 understood that, when each of the partitions 200 is connected to the upper cover plate 120 and the lower base plate 130, each of the partitions 200, the upper cover plate 120 and the lower base plate 130 forms an i-shaped structure, so that the entire case body 100 of the battery pack 10 has a honeycomb structure having high strength and rigidity, thereby satisfying the requirements of the case body 100 for load-bearing, impact resistance, extrusion resistance, and the like. Also, the tank main body 100 has a relatively simple structure and a high space utilization rate. When the battery pack 10 is mounted on the whole vehicle, the structural strength of the battery pack 10 can be used as a part of the structural strength of the whole vehicle, so that the structural strength of the whole vehicle can be improved, the design requirement of light weight of the whole vehicle of the electric vehicle is favorably met, and the design and manufacturing cost of the whole vehicle is reduced.

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 arranged in sequence in the second direction and connected in series. The pole-core group 400 is encapsulated in an encapsulation film 500 (as shown in fig. 23 or fig. 24); further, the longitudinal direction of the pole core string 401 extends in the second direction, which is the width direction of the case or the longitudinal direction of the case. In some embodiments, the second direction is the length direction of the housing, i.e., the Z direction as shown in the figures.

Wherein, the outer side of the box body is also provided with a fixing part 110 which is used for being fixedly connected 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 the outer side of the box refers to the outer surface of the box, and although in the embodiment of the present application, the fixing portion 110 is disposed on the outer side of the box, and the distribution box 12 is also disposed on the outer side of the box, the distribution box 12 and the fixing portion 110 are not limited to be disposed on the same outer side of the box, and both may be disposed on outer sides of different positions of the box.

Most of the conventional battery packs are formed by assembling single batteries into a battery module and then assembling the battery module onto a box body of the battery pack to form a battery pack structure. The general single battery is that the pole core is put into the battery shell and is packaged through the cover plates at the two ends, then a plurality of single batteries are fixed together by utilizing the fixed structures such as the end plates, the side plates and the connecting sheets, thereby assembling the battery module, and then the battery module is assembled on the box body of the battery pack 10.

In the embodiment of the application, the pole core groups 400 are packaged in the packaging film 500, the pole core groups 400 are connected in series to form the pole core strings 401, and the pole core strings 401 are directly arranged in the box body of the battery pack 10, so that double sealing is realized through the packaging film 500 and the box body of the battery pack 10, and the sealing effect is favorably improved; therefore, the pole core string 401 is directly arranged in the box body of the battery pack 10, and a battery shell of a single battery and a fixing structure (such as an end plate, a side plate, a connecting sheet and the like) of a battery module in the prior art can be omitted, so that the space utilization rate of the battery pack 10 can be improved, the weight of the battery pack 10 is reduced, and the energy density of the battery pack 10 is improved, and the battery pack 10 is simple in structure, high in assembly efficiency and beneficial to reducing the production cost; furthermore, in the sub-case of the battery pack 10 of the present application, the partition plate 200 is located between the upper cover plate 120 and the lower base plate 130, and the partition plate 200 is connected to the upper cover plate 120 and the lower base plate 130, so that the partition plate 200, the upper cover plate 120 and the lower base plate 130 form an i-shaped structure, which has high strength and rigidity, thereby meeting the requirements of the case of the battery pack 10 on the performances of bearing, impact resistance, extrusion resistance and the like. Secondly, the structure of the box of the battery pack 10 is simple, the manufacturing cost is low, and the space utilization rate is high. In addition, the partition plate 200 partitions the sub-case into the plurality of accommodating chambers 300, and when the pole core string 401 in one accommodating chamber 300 is thermally out of control, the pole core strings 401 in other accommodating chambers 300 are not affected, so that the working safety of the battery pack 10 can be improved. In addition, when installing this kind of battery package 10 on whole car, this battery package 10's structural strength can regard as a part of whole car structural strength to can promote whole car's structural strength, be favorable to realizing the design requirement of whole car lightweight of electric automobile, also reduce the design and the manufacturing cost of whole car simultaneously.

In the embodiment of the present application, referring to fig. 6 and 7, the sub-case 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-case 101 is provided with an opening 180, and the pole core string 401 can be installed in the accommodating cavity 300 through the opening 180, so that the installation is convenient to operate, and the case can have high structural strength. Wherein the box further comprises 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 the end plate 112 corresponding to the opening 180 of the sub-tank 101 is removed when replacing or repairing, thereby simplifying the operation. Alternatively, each opening 180 may be a plurality of end plates 112, i.e., a plurality of end plates 112 collectively enclose one opening 180 of the sub-tank 101.

It should be noted that, when the sub-box 101 is provided with the opening 180 only at the first end or the second end, the sub-box 101 has one opening 180, and when the sub-box 101 is provided with the openings 180 at both the first end and the second end, the sub-box 101 has two openings 180, that is, 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 end plates 112 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 share the same end plate for closing. With such an arrangement, the machining of the end plate 112 can be simplified, which is beneficial to saving cost.

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 to the sub-tank 101 to close the opening 180 of the sub-tank 101; alternatively, the end plate 112 is bonded to the sub-tank 101 to close the opening 180 of the sub-tank 101; alternatively, the end plate 112 is riveted or screwed to 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.

Wherein, the first end and the second end of the sub-box 101 along the second direction Z may be both provided with openings 180, and each opening 180 is respectively sealed 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 open ends, and a housing cover 1213. The base 1211 covers an opening at one end of the cylindrical body 1212, and the cover 1213 covers an opening at the other end of the cylindrical body 1212, so that the base 1211, the cylindrical body 1212 and the cover 1213 together enclose an accommodating space of the outer casing 121, the power distribution assembly 122 is located in the accommodating space, and the outer casing 121 is fixed to the box through the base 1211, that is, the base 1211 is fixed to the box.

Further, the base 1211 is fixed to the end plate 112 corresponding to the opening 180 at the first end or the second end of the sub-box 101 along the second direction, as shown in fig. 7, the end plate 112 corresponding to the openings 180 at the first ends of the plurality of sub-boxes 101 is an integral part, and the base 1211 is fixed to the end plate 112 at the opening at the first end of the sub-box 101, so as to fix 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 supports 600, the insulating supports 600 are located inside the end plate 112, and the opening 180 at the first end and/or the second end of the sub-case 101 along the second direction Z is provided with the insulating supports 600. The two polar core groups 400, which are located at the opening 180 at the same end of the sub-tank 101 in the second direction Z and are respectively located in two adjacent accommodating 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 some embodiments, an insulating support 600 is disposed at the opening 180 of the first end or the second end of each sub-tank 101 along the second direction Z.

The inner side of the end plate 112 may be understood as a side of the end plate 112 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 7, the plurality of insulating supports 600 located at the same end of the box main body 100 along the second direction Z are integrally formed. That is, the plurality of insulating supports 600 at the first end of the tank main body 100 are integrally formed, and/or the plurality of insulating supports 600 at the second end of the tank main body 100 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 set 400. As shown in fig. 13, the pole core group 400 includes a first electrode drawing part 410 and a second electrode drawing part 420 for drawing current, and the first electrode drawing part 410 and the second electrode drawing part 420 are distributed on opposite sides of the pole core group 400 along a second direction.

The first electrode lead-out part 410 of one polar core group 400 of two polar core groups 400 located on the same side and adjacent to the opening 180 in two adjacent accommodating cavities 300 and the first electrode lead-out part 410 of the other polar core group 400 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 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 receiving cavities 300, which are located on the same side and adjacent to the opening 180, 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 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 other embodiments, the first electrode drawing part 410 of one pole core group 400 and the second electrode drawing part 420 of the other pole core group 400 in the two adjacent receiving cavities 300, which are located on the same side and adjacent to the opening 180, 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, 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 plates 112. 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, the insulation protective covers 700 at the same end of the box main body 100 along the second direction are integrally formed. That is, the plurality of insulation protective covers 700 at the first end of the box main body 100 are integrally formed, and/or the plurality of insulation protective covers 700 at the second end of the box main body 100 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 some embodiments of the present application, the plurality of pole core strings 401 are electrically connected to form an energy storage assembly having electrode lead-out terminals for drawing current, including a total positive terminal and a total negative terminal, and the power distribution assembly 122 includes input terminals including a positive input and a negative input. As shown in fig. 7, 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 module, respectively.

As shown in fig. 8, a second interface set is disposed on the outer casing 121, and is electrically connected to the input terminal of the power distribution assembly 122, the second interface set may be disposed on the base 1211 of the outer casing 121, and the second interface set also includes a total positive interface 1214 and a total negative interface 1215, and the total positive interface 1214 and the total negative interface 1215 of the second interface set are electrically connected to the positive input end and the negative input end 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 that the electrical connection between the distribution box 12 and the energy storage component, that is, the electrical connection between the distribution box 12 and the pole core string 401, is realized.

In addition, a sampling component is further disposed in the sub-box 101, the sampling component is mainly used for collecting Information such as voltage, temperature, and current of the pole piece string 401, and may include a plurality of Battery Information Collectors (BIC), for example, 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 further includes a Battery Management System (BMS) disposed within the housing 121, which may be integrated with the power distribution assembly 122, for example, as a module, wherein the sampling assembly is electrically connected to the Battery Management System.

Still further, the first interface group may further include a sampling interface 1123, the sampling interface 1123 being electrically connected to the sampling assembly, and the second interface group may further include 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, thereby electrically connecting the sampling assembly to the battery management system.

It is understood that the power distribution assembly 122 further includes an output terminal, the output terminal includes 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 disposed on the case cover 1213 of the outer case 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 can be set to be a male plug structure, and the second interface group can be set to be a female plug structure, so that when the distribution box 12 is installed on the box body, the corresponding interfaces of the first interface group and the second interface group are connected together by plugging, and the installation is facilitated.

In other embodiments, the energy storage component and the distribution box 12 may also be electrically connected by wires. Specifically, the battery pack 10 may further include a connection wire. The energy storage assembly formed by electrically connecting the plurality of pole core strings 401 has current drawing electrode terminals including a total positive terminal and a total negative terminal, while the power distribution assembly 122 includes input terminals including a positive input and a negative input. A first through hole may be formed in the end plate 112 of the box, a second through hole may be formed in the base 1211 of the outer casing 121, and a connection wire sequentially passes through the first through hole and the second through hole to electrically connect the electrode leading-out terminal of the energy storage module and the input terminal of the power distribution module 122 correspondingly.

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

In some embodiments, the electrode outgoing terminal of the energy storage assembly and the power distribution box 12 are located at the same end of the case in the second direction, so that the motor outgoing terminal is electrically connected with the power distribution box 12, and the wiring is simplified. Of course, in other embodiments, the electrode leading-out terminal of the energy storage assembly and the power distribution box 12 may be located at different ends of the box body, and the electrode leading-out terminal and the power distribution box 12 may be electrically connected through a wire.

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

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

second rims

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

Among the plurality of sub-boxes 101, the sub-boxes 101 located at both ends in the third direction Y are end sub-boxes, one of the two end sub-boxes is connected to the first frame 140, and the other is connected to the second frame 150. In fig. 4, the first sub-box 101 and the last sub-box 101 in the Y direction are end sub-boxes, respectively.

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

Specifically, at least one of the upper and

lower plates

120 and 130 of the end sub-box connected to the first rim 140 and the first rim 140 are integrally formed, and at least one of the upper and

lower plates

120 and 130 of the end sub-box connected to the second rim 150 and the second rim 150 are integrally formed. For example, a one-piece aluminum profile is extruded.

However, in other embodiments, the end sub-box connected to the first bezel 140 is integrally formed with the first bezel 140, and the end sub-box connected to the second bezel 150 is connected to the second bezel 150 by direct or indirect means. Alternatively, the end sub-case connected to the second bezel 150 and the second bezel 150 are integrally formed, and the end sub-case connected to the first bezel 140 and the first bezel 140 are directly or indirectly connected.

In some embodiments, as shown in fig. 4 and 5, the first frame 140 and the second frame 150 have a cavity therein, and a reinforcing plate 141 is disposed in the cavity, wherein the reinforcing plate 141 divides the cavity into a plurality of sub-cavities. With this configuration, the first frame 140 and the second frame 150 can have certain structural strength, thereby improving the impact and compression strength of the battery pack 10. However, in other embodiments, the first bezel 140 or the second bezel 150 has a cavity therein.

Further, the box main body 100 may further include a connection plate 142, and the connection plate 142 is connected between two adjacent sub-boxes 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.

Further, the connecting plate 142 is internally provided with a cavity, reinforcing ribs 143 are arranged in the cavity, and the cavity is divided into a plurality of sub-cavities by the reinforcing ribs 143. With such an arrangement, the structural strength of the connecting plate 142 can be increased, and the connection reliability of the two sub-housings 101 can be improved.

Specifically, the fixing portion 110 of the box body may be disposed on the first frame 140 and the second frame 150, that is, the fixing portion 110 is disposed on both the first frame 140 and the second frame 150, and the fixing portion 110 is fixed to the external carrier. As shown in fig. 3, the fixing portion 110 is a mounting hole disposed on the first frame 140 and the second frame 150, and the mounting hole is used for a fastener (e.g., a bolt or a rivet) to pass through so as 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 also be arranged at an angle with the first direction, for example, 5 ° or 10 °. Further, the fixing portion 110 is provided in plurality, and the fixing portions 110 provided 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.

Similarly, the fixing portions 110 disposed on the second frame 150 are sequentially arranged along the length direction of the second frame 150. The length direction of the second frame 150 is parallel to the second direction.

Of course, in another embodiment, the fixing portion 110 may also be a hanging ring disposed on the first frame 140 and the second frame 150. The hanging ring is fixedly connected with the vehicle body so as to connect and fix the battery pack 10 on an external carrier.

However, in another embodiment, the fixing portion 110 is a mounting block disposed on the first frame 140 and the second frame 150, and the mounting block can be fixed to the vehicle body by welding. Of course, the mounting block can also be fixed to the external carrier by gluing or snapping.

Of course, in other embodiments, the fixing portion 110 may also be disposed on the upper cover plate 120 or the lower base plate 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 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. 12, the pole piece string 401 is greater than 400mm in length, and further, the pole piece string 401 is 400mm to 2500mm in length. 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. 12 and 14, 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 some embodiments, as shown in fig. 3, 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 the third direction Y. In this way, more pole core strings 401 can be arranged in the accommodating cavity 300 to meet the requirements of practical use.

Several cases of electrically connecting the plurality of pole core strings 401 in the same receiving cavity 300 will be described in detail below, and it should be noted that the following description is only an example, and the embodiments of the present application are not limited thereto:

referring to fig. 15 and 16, 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. 15 and 16, 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. 15). 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. 16).

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. 17, 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. 18, 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. 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-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. 18 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. 19, 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. 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-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. 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: 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. 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-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. 21, 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. 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-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. 13 and 14 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. 23, 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. 24, 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 box main body 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 shell 100, holds chamber 300 evacuation back, can reduce the stock of materials such as steam, oxygen in the case main part 100, avoids steam, oxygen to the long-time ageing effect of utmost point core group 400 and each spare part in the case main part 100, improves the life of the inside utmost point core group 400 of shell 100 or each spare part.

In a further embodiment, the tank main body 100 is provided with a suction hole. The number of the pumping holes may be one or more, and may be disposed at a position of the top cover plate 120 or the bottom plate 130 corresponding to the receiving cavity 300, or disposed on the first frame 140 and the second frame 150.

In a further embodiment, glue injection holes 102 (shown in fig. 3) are formed in the tank main body 100, each accommodating 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 accommodating cavity 300 so as to fixedly connect the pole core group 400 and the tank main body 100. The pole core assembly 400, the case main body 100, and the separator 200 may be fixedly coupled together in a potting form 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 102 is provided on the upper cover plate 120 of the sub-housing 101. Of course, in other embodiments, the glue injection holes 102 may also be disposed on the lower plate 130 of the sub-box 101.

In a further embodiment, as shown in fig. 14, two adjacent pole-core groups 400 constituting the 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. So set up, can guarantee to have higher joint strength between utmost point core group 400.

In some embodiments, as shown in fig. 2, the tank body 100 is provided with an explosion-proof valve 800, 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 serve as a safety explosion-proof function.

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 comprises a cover body 802 connected with the box main body 100 in a sealing mode and a protruding part 801 arranged on the cover body 802, wherein 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 region 803 of the 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 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 plate 120, and the cover body 802 is hermetically connected to the upper cover plate 120. The sealing connection is not particularly limited, and may be achieved by welding or gluing, for example.

In some embodiments, as shown in fig. 3, 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 lower bottom plate 130 of the plurality of sub-cases 101, and the liquid cooling members 900 are disposed to cool and dissipate heat of the pole 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 fixing part 110. 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.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," etc., mean 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 application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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: various changes, modifications, substitutions and alterations can 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. A battery pack is characterized by comprising a box body, a power distribution box and a plurality of pole core strings;

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

the base cap seals the one end opening of tube-shape body, the cap seals the other end opening of tube-shape body, base, tube-shape body and cap enclose into the accommodation space of shell body jointly, the 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 according to claim 1, wherein the outer housing includes a base and a housing cover, the housing cover is a groove structure, the base and the housing cover are fixed to cover a 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 to the box through the base.

4. The 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 is provided with an opening, the case further includes end plates closing the openings, each of the openings corresponding to at least one of the end plates;

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

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

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

the two-pole core group in the containing cavity is 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 the plurality of insulating supports at the same end of the case main body in the second direction are integrally formed.

8. The battery pack of claim 1, wherein the energy storage assembly has an electrode lead-out terminal to draw current, and the power distribution assembly includes an input terminal;

the electrode lead-out terminal is electrically connected with the first interface group, the outer shell is electrically connected with the second interface group, and the first interface group is electrically connected with the second interface group.

9. The battery pack of claim 1, further comprising a connecting lead, the energy storage assembly having an electrode lead-out terminal for drawing current, the power distribution assembly comprising an input terminal;

the electrode leading-out terminal is electrically connected with the input terminal through the connecting lead sequentially passing through the first through hole and the second through hole.

10. The battery pack of claim 8 or 9, wherein the battery pack further comprises a sampling assembly, the sampling assembly is located in the box body, the distribution box further comprises a battery management system, the battery management system is located in an outer shell of the distribution box, and the sampling assembly is electrically connected with the battery management system.

11. The battery pack according to claim 8 or 9, wherein the electrode lead-out terminal of the energy storage assembly and the power distribution box are located at the same end of the case in the second direction.

12. 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, which is different from the first direction and the second direction.

13. The battery pack of claim 12, wherein the case body further comprises a first rim and a second rim 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 the two ends in 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 of the two end sub-boxes is connected with the second frame.

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

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

16. The battery pack of claim 1, wherein the pole piece string is greater than 400mm in length; 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 the second direction, and the first electrode leading-out part of one pole core group in two adjacent pole core groups forming the pole core string is electrically connected with the second electrode leading-out part of the other pole core group.

17. The battery pack according to claim 16, wherein a plurality of the pole core strings are disposed in the accommodating cavity, the plurality of pole core strings are sequentially arranged in the 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 the length direction of the case, and the third direction is the width direction of the case; or the second direction is the width direction of the box body, and the third direction is the length direction of the box body.

18. The battery pack of claim 17, wherein a plurality of the pole pieces 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, 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; 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 the pole core strings in the containing cavity are connected in 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.

19. The battery pack of claim 17, wherein the pole core strings in two adjacent receiving cavities are connected in series or in parallel;

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

when two adjacent polar core clusters in the containing cavities are connected in parallel, the first polar core group of one of the polar core clusters in one of the containing cavities in two adjacent containing cavities is electrically connected with the first polar core group of one of the polar core clusters in the other containing cavity, and the last polar core group of one of the polar core clusters in one of the containing cavities in two adjacent containing cavities is electrically connected with the last polar core group of one of the polar core clusters in the other containing cavity.

20. The battery pack of claim 16, wherein the receiving cavity is provided with a pole piece string; 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.

21. The battery pack according to claim 1, wherein the pole core groups comprise a pole core group main body and a first electrode leading-out part and a second electrode leading-out part 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 main body along a second direction, and the first electrode leading-out part of one of the two adjacent pole core groups is electrically connected with the second electrode leading-out part of the other pole core group through a second conductive member;

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

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

22. The battery pack according to claim 1, wherein the plurality of pole core groups constituting the pole core string are encapsulated in one encapsulating 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.

23. 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.

24. 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 cavity so as to fixedly connect the pole core group and the case body.

25. The battery pack according to claim 1, wherein a plurality of partitions are provided in the sub-case, the partitions are arranged at intervals in a third direction, a length of each of the partitions extends in the second direction, the third direction is different from the first and second directions, the partitions 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 partitions.

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 fixing portion.