CN113782898A

CN113782898A - Battery pack box, battery pack and electric vehicle

Info

Publication number: CN113782898A
Application number: CN202010443558.2A
Authority: CN
Inventors: 王晓鹏; 彭青波; 鲁志佩; 朱建华; 朱燕; 孙华军
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2021-12-10

Abstract

The application provides a battery pack box body, a battery pack and an electric vehicle, wherein the battery pack box body comprises at least one box body and an installation part which is connected with the box body and is used for being connected with an external load; the battery pack box comprises a box body, and is characterized in that at least one heat management partition plate is arranged on the box body and divides the box body into a plurality of layers of containing units, the plurality of layers of containing units are stacked along a first direction, and the first direction is the height direction of the battery pack box body; at least one structural beam is arranged in the containing unit, and the structural beam divides the containing unit into a plurality of containing cavities for containing the pole core assemblies. The battery pack box has the advantages of high space utilization rate, high structural strength, good heat management performance, simple structure and high production efficiency. In addition, the combined assembly can be carried out according to design requirements, and the flexibility and the universality are high.

Description

Battery pack box, battery pack and electric vehicle

Technical Field

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

Background

With the continuous popularization of new energy automobiles, the use requirement of power batteries in the new energy automobiles becomes higher and higher. The traditional battery pack adopts the structure that the battery module is arranged in a battery pack box body to form the battery pack. The battery module comprises a battery pack consisting of a plurality of single batteries which are arranged in sequence, side plates arranged on two sides of the battery pack and end plates arranged at two ends of the battery pack. The side plates and the end plates are connected in a bolt or pull rod or welding mode to fix the battery pack. After the battery module is assembled, the battery module is mounted in a battery pack case through fasteners such as bolts, and in order to improve the strength of the battery pack, it is generally necessary to provide cross beams and longitudinal beams in the battery pack. Due to the fact that structural members such as end plates, side plates, cross beams, longitudinal beams and fasteners are added, the weight of the whole battery pack is large, the utilization rate of the internal space of the battery pack is reduced, and the energy density of the battery pack cannot meet the requirement of a user on the cruising ability of the electric vehicle. Moreover, the structure has the defects of complicated assembling process and complex assembling procedure, the battery is required to be assembled into the battery module firstly, and then the battery module is arranged in the battery pack box body, so that the cost of manpower, material resources and the like is increased.

In addition, the battery pack case is generally composed of a tray and an upper cover, the tray is formed by assembling and welding a plurality of edge beams and a bottom plate, and in order to ensure that the tray has sufficient structural strength, some reinforcing cross beam and longitudinal beam structures are generally welded inside the tray, however, the design causes too many parts of the battery pack case, the structure is complex, the space utilization rate is low, and the parts need to be connected through welding and other processes, and the manufacturing cost is high. In addition, the battery pack box is mostly of a single-layer structure, and the space utilization rate of the battery pack box of the single-layer structure is low. And the battery pack box body and the thermal management structure are independently designed, so that deviation exists in the manufacturing and assembling processes, the thermal management efficiency is low, and the manufacturing process and quality control difficulty is high. In addition, the battery package box does not carry out standardized design, can't make up the collocation according to the actual demand, realizes carrying out fast assembly according to different demands. The existing battery pack box body does not have universality and flexibility in use.

Disclosure of Invention

The present disclosure is directed to solving at least one of the problems in the prior art.

To this end, the present application provides a battery pack case comprising at least one case body, and a mounting member connected to the case body and configured to be connected to an external load; the battery pack box comprises a box body, and is characterized in that at least one heat management partition plate is arranged on the box body and divides the box body into a plurality of layers of containing units, the plurality of layers of containing units are stacked along a first direction, and the first direction is the height direction of the battery pack box body; at least one structural beam is arranged in the containing unit, and the structural beam divides the containing unit into a plurality of containing cavities for containing the pole core assemblies.

The application provides a battery package, including above-mentioned battery package box, and install in utmost point core cluster in the battery package box, utmost point core cluster set up in the intracavity that holds of battery package box.

The application still provides an electric motor car, including automobile body and above-mentioned battery package, the battery package passes through the installed part is fixed in the automobile body.

The beneficial effect of this application:

1. the box body is directly separated through the heat management partition plate to form a multi-layer containing unit; the containing unit is further divided into a plurality of containing cavities by the structural beams. The design of the multilayer accommodating cavity can improve the space utilization rate of the battery pack, and further improve the energy density of the battery pack. The heat management partition plate has two purposes, namely, the effect that the partition box body forms the containing unit is achieved, the pole core assembly in the containing unit can be subjected to heat management, the structure is simple, the light design requirement is met, and the design and manufacturing cost is reduced.

2. The structure has higher strength and rigidity, thereby meeting the requirements of the battery pack box body on the performances of bearing, impact resistance, extrusion resistance and the like.

3. This application holds the independent design of chamber, when holding intracavity utmost point core cluster and generating heat out of control, can not influence other chambers that hold, and then can improve the security of battery package work.

4. The battery pack box body can be designed and manufactured according to standard sectional materials, and standardized and modularized manufacturing of the battery box body and the battery pack is achieved; in addition, can select the case body of suitable quantity to carry out the concatenation combination according to battery package design demand, realize not equidimension, not unidimensional battery package equipment production, and then realize the flexibility and the commonality of battery package design.

5. This application utmost point core cluster sets up in the battery package box, has left out the fixed knot of battery case and battery module among the prior art and has constructed (for example end plate, curb plate and fastener etc.) to can improve the space utilization of battery package, alleviate the weight of battery package, improve the energy density of battery package, the battery package simple structure of this application moreover, the packaging efficiency is high, is favorable to reduction in production cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a case body of a battery pack case according to an embodiment of the present application.

Fig. 2 is an exploded view of a box body and a mounting member according to an embodiment of the present disclosure.

Fig. 3a is an assembly diagram of a box body and a mounting member according to an embodiment of the present disclosure.

Fig. 3b is a schematic view of another box body and a mounting member assembled according to an embodiment of the present disclosure.

Fig. 4a is a schematic diagram of a battery pack according to an embodiment of the present disclosure.

Fig. 4b is a schematic diagram of another battery pack structure according to an embodiment of the present disclosure.

Fig. 5 is an enlarged schematic view of a part a of a box body according to an embodiment of the present disclosure.

Fig. 6 is a schematic structural diagram of a pole core string according to an embodiment of the present application.

Fig. 7a is a schematic structural view illustrating a connection between a pole core set and a fixed spacer according to an embodiment of the present application.

Fig. 7b is an exploded perspective view of a pole piece assembly and a fixed spacer ring according to an embodiment of the present disclosure.

Fig. 8 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. 9 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. 10 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. 11 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. 12 is a schematic structural diagram of two pole cores connected in series and in parallel in two accommodating cavities according to an embodiment of the present application.

Fig. 13 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. 14 is a schematic structural diagram of two pole cores connected in series and in parallel in two accommodating cavities according to an embodiment of the present application.

Fig. 15 is a schematic structural diagram of an encapsulation film encapsulating a pole core group according to an embodiment of the present application.

Fig. 16 is a schematic structural view of an encapsulation film encapsulating a pole core group according to another embodiment of the present application.

Reference numerals

10. A battery pack;

100. a tank body; 110. a mounting member; 111. mounting holes; 112. installing a panel; 113. mounting ribs; 120. a top plate; 130. a base plate; 140. a left side plate; 150. a right side plate; 160. an end cover plate; 170. a structural beam; 180. injecting glue holes; 190. a connecting member; 131. a heat dissipating fin; 161. A front port; 162. a rear port; 121. the top plate extends to form a convex position; 132. the bottom plate extends to form a convex position;

200. a thermal management spacer; 210. a media flow path; 220. a bus bar; 230. a flow passage member is connected externally; 231. a transverse flow passage part; 232. a vertical flow passage portion; 201. the partition plate extends to form a convex position;

300. an accommodating chamber; 301. an accommodating unit;

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. and a packaging part.

Detailed Description

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

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The application provides a battery pack box body, which comprises at least one box body 100, wherein the box body 100 comprises a top plate 120 and a bottom plate 130 which are oppositely arranged along a first direction, the first direction is the height direction of the battery pack box body, at least one heat management partition plate 200 is arranged between the top plate 120 and the bottom plate 130, the box body 100 is divided into a plurality of layers of accommodating units 301 by the heat management partition plates 200, and the plurality of layers of accommodating units 301 are stacked along the first direction; at least one structural beam 170 is disposed within the receiving unit 301, and the structural beam 170 divides the receiving unit 301 into a plurality of receiving chambers 300.

The box body 100 is partitioned by the thermal management partition board 200 to form a plurality of layers of accommodating units 301; the accommodation unit 301 is further divided into a plurality of accommodation chambers 300 by the structural beams 170. The design of the multilayer accommodating cavity 300 improves the space utilization rate of the battery pack, and further improves the energy density of the battery pack. The thermal management partition plate 200 is dual-purpose, namely, the effect of directly separating the box body 100 to form the containing unit 301 is achieved, thermal management can be performed on the pole core strings in the containing unit 301, the space utilization rate of the battery pack is improved, meanwhile, thermal management is performed on adjacent containing units, and the thermal management efficiency is improved. The heat management partition plate 200, the structural beam 170 and the top plate 120, or the heat management partition plate 200, the structural beam 170 and the bottom plate 130, or the adjacent heat management partition plate 200 and the structural beam 170 form an I-shaped structure, and the structure has high strength and rigidity, so that the requirements of the battery pack box body on the performances of bearing, impact resistance, extrusion resistance and the like can be met. In addition this application battery package box simple structure has satisfied the light-weighted design requirement, has reduced design and manufacturing cost.

In some embodiments, the structural beam 170 is bonded to the top plate 120, the structural beam 170 is bonded to the or the bottom plate 130, or the structural beam 170 is bonded to the thermal management spacer 200. It is to be understood that the top plate 120, bottom plate 130, structural beams 170, thermal management spacer 200, left side plate 140, right side plate 150 are integrally formed; alternatively, one of the top plate 120, bottom plate 130, and thermal management spacer 200 is integrally formed with the structural beam 170, and the structural beam 170 is then welded to the thermal management spacer 200.

As shown in fig. 1 and 2, the case body 100 of the battery pack case according to an embodiment of the present invention includes a top plate 120 and a bottom plate 130 disposed opposite to each other along a first direction, which is a height direction of the battery pack case. The tank body 100 further includes a left side plate 140 and a right side plate 150 which are oppositely disposed in the second direction. The left side plate 140 connects the top plate 120 and the bottom plate 130; the right side plate 150 connects the top plate 120 and the bottom plate 130. The second direction is the length direction or the height direction of the battery pack box body. The top plate 120, the bottom plate 130, the left side plate 140, and the right side plate 150 enclose a box body 100. The box body 100 is also provided with an end opening.

At least one thermal management partition 200 is disposed on the tank body 100, and the thermal management partition 200 is disposed between the top plate 120 and the bottom plate 130. A thermal management spacer 200 is spaced apart from the top plate 120 and the bottom plate 130, and the thermal management spacer 200 connects the left side plate 140 and the right side plate 150. Preferably, the thermal management spacer 200 is parallel to the top plate 120 and the bottom plate 130. The thermal management partition plate 200 partitions the tank body 100 into the plurality of layers of the containing units 301, and the plurality of layers of the containing units 301 are stacked in the first direction. At least one structural beam 170 is arranged in the accommodating unit 301, and the structural beams 170 are arranged at intervals and divide the accommodating unit 301 into a plurality of accommodating cavities 300. The plurality of receiving chambers 300 may be the same size, or the plurality of receiving chambers 300 may be different sizes. The number of structural beams 170 in different levels of containment units 301 may be the same or different. Preferably, the structural beam 170 is parallel to the left and

right side plates

140, 150. The accommodating cavities 300 in the accommodating units 301 of different layers are correspondingly arranged along the first direction, or the accommodating cavities 300 in the accommodating units 301 of different layers are arranged in a staggered manner along the first direction. The dislocation set means that the ith containing cavity in the adjacent containing unit can not be completely aligned, and comprises: the ith accommodating cavities of the adjacent accommodating units 301 are different in size, so that the accommodating cavities cannot correspond to one another; or the ith accommodating chambers of the adjacent accommodating units 301 are different in position, resulting in failure to correspond one to one, and the like. i is more than or equal to 1 and less than or equal to n, and n is the number of the accommodating cavities.

As shown in fig. 1, the tank body 100 is provided with a thermal management partition board 200, and the thermal management partition board 200 divides the tank body 100 into two layers of the containing units 301, including a bottom layer of the containing units 301 and a top layer of the containing units 301. The same number of structural beams 170 are arranged in each layer of the accommodating unit 301, the structural beams 170 divide the accommodating unit 301 into n accommodating cavities 300 with the same size, and n is greater than or equal to 2. The ith containing cavity 300 of the containing unit 301 at the bottom layer and the ith containing cavity 300 of the containing unit 301 at the top layer have the same size and are in one-to-one correspondence in the first direction, and i is greater than or equal to 1 and less than or equal to n. It is understood that the thermal management partition plate 200 may be plural, and the tank body 100 is partitioned into the plurality of layers of the accommodating units 301 by the plural thermal management partition plates 200, thereby achieving better space utilization and better energy density of the battery.

For better thermal management, a media channel 210 is provided in the thermal management spacer 200 as shown in fig. 7. There is at least one media channel 210. for better thermal management, there may be multiple media channels 210. The media flow channels 210 are spaced apart and in one-to-one correspondence with the receiving chambers 300. Through the arrangement mode that the medium flow channels 210 correspond to the accommodating cavities 300 one by one, each accommodating cavity 300 corresponds to the medium flow channel 210, and high-efficiency heat management of the electric core assembly in each accommodating cavity 300 is further realized. It can be understood that the media runners 210 and the accommodating cavities 300 may not be arranged in a one-to-one correspondence, and the number, the arrangement position, the cross-sectional shape and the size of the media runners 210 can be adjusted by self according to the distribution condition of the thermal field of the electric core assembly. A plurality of medium flow channels 210 arranged on the thermal management partition plate 200 can be communicated through an intermediate piece to form a flow channel, one end of the flow channel is a medium inlet, and the other end of the flow channel is a medium outlet; or a plurality of medium flow passages 210 are merged by the merging passage and then flow in and out. For better thermal management, the media flow path 210 is a flat rectangular flow path. The specific shape of the medium flow passage 210 is not limited thereto, and may be other shapes such as a circle, and the specific shape may be modified appropriately according to the shape of the receiving chamber 300 or other requirements. For better thermal management, the media flow channel 210 may also have two stacked media flow channels in the first direction. The medium circulating in the medium flow passage can be a refrigerant or a heating medium; may be liquid medium, gas medium, etc. The selection is specifically made according to the thermal management requirements of the battery pack itself.

The box body 100 is integrally formed by extrusion of aluminum profiles. So set up, not only processing technology is simple, is favorable to reduction in production cost, but also can guarantee that case body 100 has sufficient structural strength and rigidity to satisfy the requirement of the performance such as bearing, crashproof and anti extrusion of case body.

In addition, the battery pack box body can be designed and manufactured according to standard sectional materials, and the standardized and modularized manufacturing of the battery pack box body and the battery pack is realized; in addition, can select the case body of suitable quantity to carry out the concatenation combination according to battery package design demand, realize not equidimension, not unidimensional battery package equipment production, and then realize the flexibility and the commonality of battery package design.

As shown in fig. 3 and 4, the battery pack case further includes a bus bar 220, the bus bar 220 is connected to the case body 100, and a bus passage is provided in the bus bar 220. The bus bar 220 is connected to the thermal management spacer 200, and the media channels 210 on the thermal management spacer 200 communicate with the bus duct in the bus bar 220. The media in the media channels are collected and discharged through the manifold 220, or the media are flowed into the media passages through the manifold 220. The manifold 220 may be a manifold. It is understood that the specific shape of the bus bar 220 is not further limited, and only the bus bar function is satisfied.

As shown in fig. 3, the bus bar 220 is connected to the external flow path member 230. The external flow channel 230 is L-shaped, and the L-shaped external flow channel 230 includes a horizontal flow channel portion 231 and a vertical flow channel portion 232, wherein the horizontal flow channel portion 231 is flush with the bottom plate 130. Through the setting of horizontal runner portion 232, can make the block terminal carry out the position installation of reasonable optimization to save installation space. As shown, there are two external flow-path elements 230, one of which 230 serves as a media inlet and the other 230 serves as a media outlet. The external flow path member 230 may be disposed in various manners, such as at the same end of the case body 100 or at different ends of the case body 100. The specific number of the external flow passage members 230 can be adjusted according to the actual arrangement requirement.

Specifically, as shown in fig. 1, the end opening of the tank body 100 includes a front port 161 and a rear port 162 that are disposed opposite to each other, and the media inlet and the media outlet may be provided at the same port of the tank body 100 or at two different ports of the tank body 100.

When the medium inlet and the medium outlet are provided at different ports of the tank body 100, the bus bar 220 is mounted on each of the front port 161 and the rear port 162 of the tank body 100, the bus bar 220 is fixedly connected to the thermal management partition plate 200, and the bus passage of the bus bar 220 communicates with the medium flow passage 210 of the thermal management partition plate 200. The bus bar 220 provided at the front port 161 is connected with at least one external flow path member 230 as a medium inlet; the bus bar 220 disposed at the rear port 162 is connected with at least one external flow path member 230 as a medium outlet; media enters the manifold 220 from the external port 230 at the front port 161, flows into the media channel 210, then flows out of the media channel 210, then flows into the manifold 220 at the rear port 162, and finally flows out of the external port 223 at the rear port 162. It will be appreciated that the media inlet may be provided at the rear port 162 of the tank body 100 and the media outlet may be provided at the front port 161 of the tank body 100. Thermal management of the battery pack is achieved by the flow of the medium.

When the medium inlet and the medium outlet are provided at the same port of the tank body 100, the bus bar 220 is mounted at the front port 161 of the tank body 100, the bus bar 220 is fixedly connected to the thermal management partition plate 200, and the bus duct of the bus bar 220 communicates with the medium flow passage 210 of the thermal management partition plate 200. The bus channel arranged on the bus member 200 comprises an inflow channel and an outflow channel which are not communicated with each other, one end of a partial medium flow channel 210 on the thermal management partition board 200 is connected with the inflow channel on the bus member 200, and the other end is connected with an intermediate member arranged on the rear port 162; one end of the remaining media flow channels 210 on the thermal management spacer 200 is connected to an intermediate piece disposed on the rear port 162; the other end is connected to the outflow channel of the manifold 200. The intermediate piece primarily provides communication between the various media flow passages 210. Two external flow passage members 223 are connected to the bus bar 200, wherein one external flow passage member 223 serves as a medium inlet and is communicated with an inflow channel of the bus bar 200, and the other external flow passage member 223 serves as a medium outlet and is communicated with an outflow channel of the bus bar 200. The medium enters the inflow channel of the junction piece 220 from the external flow channel piece 230 at the front port 161, flows into the medium flow channel 210, flows out of the medium flow channel 210, reversely flows into another medium flow channel through the intermediate piece arranged at the rear port 162, finally flows into the outflow channel of the junction piece 220 and flows out through another external flow channel piece 230. It is understood that the bus bar 220 may be installed at the rear port 162 of the tank body 100 and the intermediate member is installed at the front port 161 of the tank body 100.

As shown in fig. 2, the box body 100 is further provided with a plurality of heat dissipating fins 131. The heat radiating fins 131 are provided on the base plate 130. It is understood that the heat dissipating fins 131 may be disposed at other positions of the box body 100, and are not further limited herein. Further, the case body 100 may be provided with the heat radiating fins 131, or may not be provided with the heat radiating fins 131. Whether the setting is needed or not is determined according to actual conditions. In addition, the thermal management spacer 200 and the heat radiating fins 131 may be integrated on the tank body 100 in various combinations. For example, only the thermal management spacer 200 may be integrated, and both the thermal management spacer 200 and the heat dissipation fins 131 may be integrated.

As shown in fig. 2 to 5, the battery pack case further includes a mounting member 110 for enabling connection of the battery pack to an external load. The mounting member 110 may be removably or non-removably coupled to an external load. The mounting member 110 includes a mounting panel 112 connected to the case body 100 and a mounting rib 113 connected to the mounting panel 112, the mounting rib 113 is provided with a plurality of mounting holes 111, and the mounting holes 111 are used for fasteners (e.g., bolts or rivets) to pass through so as to connect and fix the battery pack 10 to an external load. The mounting panel 112 is provided with a plurality of positioning recesses. The mounting panel 112 is positioned and matched with the box body 100 through the positioning concave position. The mounting panel 112 is fixedly connected to the box body 100, and may be welded, glued, or snapped. Reinforcing rib structures are arranged in the mounting panel 112 and the mounting ribs 113. The mounting member 110 may be integrally formed by extrusion of an aluminum profile. The mounting member 110 and the tank body 100 may be integrally extruded together using an aluminum profile. So set up, not only processing technology is simple, is favorable to reduction in production cost, but also can guarantee that the box has sufficient structural strength and rigidity to satisfy the requirement of the performance such as bearing, crashproof and anti extrusion of box.

Generally, the battery pack case needs to be connected and fixed with an external load, so that special requirements are required for the performances of impact resistance, extrusion resistance and the like, and the battery pack case cannot be simply equal to the case of a battery module or a single battery. Generally, the battery pack further includes at least one of a Battery Management System (BMS), a battery connector, a battery sampler, and a battery thermal management system.

When the tank body 100 is one, the mounting members 110 are respectively mounted to the left and

right side plates

140 and 150 of the tank body 100. When the tank body 100 is plural, the mounting member 110 is mounted to the left side plate 140 of the outermost tank body 100, and the other mounting member 110 is mounted to the right side plate 150 of the other outermost tank body 100. It is to be understood that the mounting position of the mounting member 110 is not limited thereto, and other portions of the box body 100 may be provided.

When the tank body 100 is plural, the plural tank bodies 100 may be directly connected by welding, bonding, or the like, or may be connected by an intermediate connecting member. As shown in fig. 4, the battery pack case further includes a connection member 190 for connecting the plurality of case bodies 100. A reinforcing rib structure is arranged in the connecting piece 190. The strength is increased through the reinforcing rib structure, and then the overall impact resistance and the extrusion resistance of the battery pack are improved. The connecting member 190 is provided with a plurality of positioning recesses. The connecting piece 190 is matched with the box body 100 in a positioning way through the positioning concave position.

As shown in fig. 7, the top plate 120 extends outward relative to the left side plate 140 and the right side plate 150 to form a top plate extension protrusion 121; the thermal management partition board 200 extends outwards relative to the left side board 140 and the right side board 150 to form a partition board extension convex part 201; the bottom plate 130 extends outwardly relative to the left side plate 140 and the right side plate 150 to form a bottom plate extension boss 132. The positioning recesses of the connecting member 190 are respectively positioned and engaged with the top plate extending protrusion 121, the partition plate extending protrusion 201, and the bottom plate extending protrusion 132. After the box body 100 and the connecting piece 190 are positioned, the box body and the connecting piece are fixedly connected with each other through connecting structures such as welding, gluing or mechanical clamping. The plurality of positioning recesses on the mounting panel 112 are respectively positioned and matched with the top plate extending protrusion 121, the partition plate extending protrusion 201 and the bottom plate extending protrusion 132. After the box body 100 and the mounting panel 112 are positioned, they are fixedly connected to each other by welding, gluing or mechanical fastening.

The case body 100 has an end opening through which the electric core assembly is put into the receiving cavity 300.

The battery pack case further includes a plurality of end caps 160, and the end caps 160 cover the opening of each accommodating unit 301, thereby sealing the end openings of the case body 100.

The application also discloses a battery package, including the battery package box and arrange the utmost point core cluster 401 in the battery package box in, utmost point core cluster 401 set up in hold of battery package box in the chamber 300. At least one pole piece string 401 is disposed within the receiving cavity 300. The pole core string 401 comprises a plurality of pole core groups 400 which are sequentially arranged along a second direction and are connected in series; the pole core group 400 is encapsulated in an encapsulation film 500 (as shown in fig. 15 or fig. 16); the pole core string 401 has a length direction extending in a second direction. The second direction is the width direction of the box body or the second direction is the length direction of the box body. The second direction is the width direction of the battery pack box body or the second direction is the length direction of the battery pack box body. Wherein, the first direction is the X direction in the figure, and the second direction is the Z direction in the figure.

And in this application with utmost point core group 400 encapsulation in encapsulation membrane 500, a plurality of utmost point core group 400 establish ties into utmost point core cluster 401, and utmost point core cluster 401 sets up in the battery package box, realizes double sealing through encapsulation membrane 500 and battery package box, is favorable to improving sealed effect. The utmost point core cluster 401 that this application adopted has left out the fixed knot of battery case and battery module among the prior art and has constructed (for example end plate, curb plate and fastener etc.) to can improve the space utilization of battery package 10, alleviate the weight of battery package 10, improve the energy density of battery package 10, the battery package 10 simple structure of this application moreover, the packaging efficiency is high, is favorable to reduction in production cost.

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

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

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

In the application, the first direction is the height direction of the battery pack box body, the second direction is the width direction of the battery pack box body, and the third direction is the length direction of the battery pack box body; or the second direction is the length direction of the battery pack box body, and the third direction is the width direction of the battery pack box body. Wherein the first direction is the X direction in the figure, the second direction is the Z direction in the figure, and the third direction is the Y direction in the figure.

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

Further, the length of the accommodating cavity 300 along the second direction is 1300mm-2200 mm.

The tank body 100 has an open end through which the pole core string 401 is inserted into the receiving chamber 300. The installation mode is convenient to operate, and meanwhile, the box body can be guaranteed to have high structural strength. It is understood that when both ends of the case body 100 in the second direction are provided with end openings, the first and second electrodes (i.e., the positive and negative electrodes) of the pole core string 401 located in the accommodating chamber 300 may be respectively led out from the two end openings.

In one embodiment, as shown in fig. 6, the length of the pole core string 401 is greater than 400mm, and further, the length of the pole core string 401 is 400mm to 2500 mm. Further, the pole core string 401 has a length of 1000mm to 2000 mm. Further, the pole core string 401 has a length of 1300mm to 2200 mm. It can be understood that, by arranging a plurality of pole core groups 400 in series to form the pole core string 401 in the accommodation chamber 300, the internal resistance can be reduced as compared with the conventional case in which only one pole core group 400 having the same length as the pole core string 401 is arranged. Because, once the longer the pole core group 400 is, the length of the copper aluminum foil used as the current collector is increased correspondingly, the internal resistance is greatly improved, the current requirements of higher and higher power and quick charging cannot be met, and the problem can be avoided by adopting the serial connection mode of the plurality of pole core groups 400.

Referring to fig. 7a and 7b, in a further embodiment, the pole core groups 400 include first and second

electrode drawing parts

410 and 420 for drawing current, the first and second

electrode drawing parts

410 and 420 are distributed on opposite sides of the pole core groups 400 in a second direction, and the first electrode drawing part 410 of one pole core group 400 of two adjacent pole core groups 400 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, a plurality of pole core groups 400 adopt the mode of arranging of "head to head", and two liang of series connections between the pole core group 400 can be realized comparatively conveniently to this mode of arranging, and connection structure is simple.

In an embodiment, a plurality of pole core strings 401 are disposed in the accommodating cavity 300, the plurality of pole core strings 401 are sequentially arranged along the thickness direction of the pole core assembly 400 and electrically connected, and the thickness direction of the pole core assembly 400 is parallel to the third direction. In this way, more pole core strings 401 can be arranged in the accommodating cavity 300 to meet the requirements of practical use.

There are several different situations for the electrical connection of multiple pole core strings 401 within the same receiving cavity 300. Referring to fig. 8 and 9, in a further embodiment, a plurality of pole piece strings 401 in the same housing 300 are connected in series. Referring to fig. 10, in a further embodiment, a plurality of pole piece strings 401 in the same containing cavity 300 are connected in parallel. Referring to fig. 11, in a further embodiment, the pole piece strings 401 in two adjacent receiving cavities 300 are connected in series. Referring to fig. 12, in a further embodiment, the pole piece strings 401 in two adjacent receiving cavities 300 are connected in parallel.

As for the pole piece string 401 provided in each accommodation chamber 300, the way of electrically connecting the pole piece strings 401 of two adjacent accommodation chambers 300 is similar to the above-described way. As shown in fig. 13, 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. As shown in fig. 14, 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.

Referring to fig. 7a and 7b again, in a further embodiment, the pole core group 400 includes a pole core group main body 430, and a first electrode leading-out part 410 and a second electrode leading-out part 420 for leading out current, the first electrode leading-out part 410 and the second electrode leading-out part 420 are distributed on two opposite sides of the pole core group main body 430 along a second direction, and the first electrode leading-out part 410 of one pole core group 400 of two adjacent pole core groups 400 is electrically connected with the second electrode leading-out part 420 of the other pole core group 400 through a first conductive member 440;

a fixed spacing ring 450 is arranged between the pole core group main bodies 430 of two adjacent pole core groups 400, and the first conductive piece 440 is fixed in the fixed spacing ring 450; the pole core group main body 430 of two adjacent pole core groups 400 and the fixed space ring 450 are filled with structural adhesive, so that a plurality of pole core groups 400 can be connected into a whole through the structural adhesive, and the structural strength of the pole core string 401 can be improved, so that the pole core string 401 is installed in the accommodating cavity 300.

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

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

Referring to fig. 15, in a further embodiment, the plurality of pole-core groups 400 constituting the pole-core string 401 are encapsulated in an encapsulation film 500; the pole core group 400 comprises a pole core group main body 430, and a first electrode leading-out part 410 and a second electrode leading-out part 420 for leading out current, wherein the connection part of the first electrode leading-out part 410 of one pole core group 400 and the second electrode leading-out part 420 of the other pole core group 400 in the two pole core groups 400 connected in series is positioned in the encapsulation film 500; the encapsulation film 500 is formed with encapsulation parts at positions opposite to the first electrode drawing part 410 and/or the second electrode drawing part 420 to isolate the adjacent two-pole core pack bodies 430.

Keep apart between the core group 400 of a plurality of utmost points through encapsulation portion 510, avoid the electrolyte between the core group 400 of a plurality of utmost points to circulate each other, can not influence each other between the core group 400 of a plurality of utmost points, and the electrolyte in the core group 400 of a plurality of utmost points can not be because of the too big decomposition of potential difference, guarantees the security and the life of battery.

The enclosure portion 510 may be implemented in various ways, for example, the enclosure portion 510 may be formed by tightening the enclosure film 500 with a tie, or the enclosure portion 510 may be formed by directly thermally fusing the enclosure film 500. The specific manner of the encapsulation portion 510 is not particularly limited.

In this application, the preferable sealing material used for the sealing film 500 is a PET and PP composite film or an aluminum plastic film. And adopt and can expand after the partial volume ization of utmost point core group 400, in this application preferred, take out the negative pressure with the inside cavity of encapsulation membrane 500 and retrain utmost point core group 400, consequently have the gas tightness requirement to holding chamber 300 in the encapsulation membrane 500.

Referring to fig. 16, in other embodiments, each of the pole-core groups 400 is encapsulated in an encapsulation film 500 to form pole-core groups 400, and the pole-core groups 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 box body is provided with glue injection holes 180 (as shown in fig. 1) communicating with the accommodating cavities 300, each accommodating cavity 300 corresponds to at least one glue injection hole 180, and the glue injection holes 180 are used for filling glue into the corresponding accommodating cavity 300 so as to fixedly connect the pole core group 400 and the box body 100. Wherein glue injection holes 180 are shown in figure 1. The pole core assembly 400 and the case body 100 can be fixedly connected together in a potting manner by using hollow glass bead filling glue or structural glue, so that the structural strength of the battery pack is further improved.

In a further embodiment, two adjacent pole core groups 400 forming a pole core string 401 are electrically connected through a first conductive member 440, and the glue injection hole 180 is disposed corresponding to the first conductive member 440. So set up, can guarantee to have higher joint strength between utmost point core group 400.

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

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

Claims

1. The utility model provides a battery package box which characterized in that: comprises at least one box body (100) and a mounting piece (110) which is connected with the box body (100) and is used for connecting with an external load;

the battery pack box comprises a box body (100), and is characterized in that at least one heat management partition plate (200) is arranged on the box body (100), the heat management partition plate (200) divides the box body (100) into a plurality of layers of accommodating units (301), the plurality of layers of accommodating units (301) are stacked in a first direction, and the first direction is the height direction of the battery pack box body;

at least one structural beam (170) is arranged in the containing unit (301), and the structural beam (170) divides the containing unit (301) into a plurality of containing cavities (300) for containing the pole core assemblies.

2. The battery pack case of claim 1, wherein:

the box body (100) comprises a top plate (120) and a bottom plate (130) which are oppositely arranged along a first direction, and a left side plate (140) and a right side plate (150) which are oppositely arranged along a second direction;

the left side plate (140) is respectively connected with the top plate (120) and the bottom plate (130), and the right side plate (150) is respectively connected with the top plate (120) and the bottom plate (130);

the heat management partition plate (200) is arranged between the top plate (120) and the bottom plate (130), and the heat management partition plate (200) is respectively connected with the left side plate (140) and the right side plate (150).

3. The battery pack case of claim 2, wherein:

the accommodating cavities (300) in the accommodating units (301) in different layers are correspondingly arranged in the first direction one by one, or the accommodating cavities (300) in the accommodating units (301) in different layers are arranged in a staggered manner in the first direction.

4. The battery pack case of claim 3, wherein:

the box body (100) is provided with the heat management partition board (200), the heat management partition board (200) divides the box body (100) into two layers of containing units (301), and the containing units (301) comprise a bottom layer and a top layer;

the same number of structural beams (170) are arranged in each layer of the accommodating unit (301), the structural beams (170) divide the accommodating unit (301) into n accommodating cavities (300) with the same size, and n is larger than or equal to 2;

the ith accommodating cavity (300) in the accommodating unit (301) at the bottom layer and the ith accommodating cavity (300) in the accommodating unit (301) at the top layer are in one-to-one correspondence in the first direction, and i is greater than or equal to 1 and less than or equal to n.

5. The battery pack case of claim 1, wherein:

and a medium flow channel (210) is arranged on the heat management partition plate (200).

6. The battery pack case of claim 5, wherein:

the medium flow channels (210) are arranged at intervals and correspond to the accommodating cavities (301) one by one.

7. The battery pack case of claim 6, wherein:

the medium flow passage (210) is a flat flow passage having a rectangular cross section.

8. The battery pack case of claim 5, wherein:

the battery pack box body further comprises a bus piece (220), the bus piece (220) is connected with the heat management spacing plate (200), and the medium flow channel (210) on the heat management spacing plate (200) is communicated with a bus channel on the bus piece (220).

9. The battery pack case of claim 1, wherein:

the box body (100) is also provided with a plurality of radiating fins (131).

10. The battery pack case of claim 1, wherein:

the box body (100) is a plurality of, and a plurality of box body (100) are as an organic whole through connecting piece (190) connection, installed part (110) and the outermost case body (100) fixed connection.

11. The battery pack case of claim 1, wherein:

the box body (100) is integrally formed by extrusion of aluminum profiles,

or the box body (100) and the mounting piece (110) are integrally extruded and molded.

12. A battery pack, comprising: comprising a battery pack case according to any one of claims 1 to 11, and a pole core string (401) mounted in the battery pack case, the pole core string (401) being disposed in the receiving cavity (300) of the battery pack case.

13. An electric vehicle, characterized in that: the electric vehicle includes a vehicle body and the battery pack (10) according to claim 12, the battery pack being fixed to the vehicle body by the mounting member (110).