CN212587601U

CN212587601U - Battery pack and electric vehicle

Info

Publication number: CN212587601U
Application number: CN202020890181.0U
Authority: CN
Inventors: 王晓鹏; 彭青波; 鲁鹏; 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: 2021-02-23
Anticipated expiration: 2030-05-22

Abstract

The utility model discloses a battery pack, which comprises a box body, an installation part, a plurality of pole core strings and at least one reinforcing plate, wherein the box body comprises a box body, the box body comprises at least one sub-box body, and a cooling flow channel is arranged on the sub-box body; the plurality of pole core strings are electrically connected with each other, each pole core string comprises a plurality of pole core groups connected in series, and the pole core groups are packaged in the packaging film; the reinforcing plate is located in the sub-box body, the reinforcing plate divides the inner part of the sub-box body into a plurality of accommodating cavities, and at least one of the accommodating cavities is internally provided with at least one pole core string. Above-mentioned structure can alleviate the weight of battery package, improves the intensity and the rigidity of battery package to can improve the radiating efficiency of battery package, reduce the safety risk of battery package. In another aspect, an electric vehicle is disclosed, which comprises the battery pack.

Description

Battery pack and electric vehicle

Technical Field

The utility model relates to a battery technology field, in particular to battery package and electric motor car.

Background

With the continuous popularization of new energy automobiles, the use requirement of power batteries in the new energy automobiles becomes higher and higher. The traditional battery pack 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 needs an additional liquid cooling piece for cooling, and the design causes excessive parts in the whole battery pack and also causes the increase of the cost of the battery pack.

SUMMERY OF THE UTILITY MODEL

The present disclosure is directed to solving at least one of the problems of the prior art, and in one aspect, provides a battery pack including:

the box body comprises a box body, the box body comprises at least one sub-box body, and a cooling flow channel is arranged on the sub-box body;

the mounting part is arranged on the box body and is used for being fixedly connected with an external load;

the pole core strings are electrically connected with each other, each pole core string comprises a plurality of pole core groups connected in series, and the pole core groups are packaged in the packaging film;

at least one reinforcing plate is located in the sub-box body, the reinforcing plate divides the interior 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.

In some embodiments, the sub-box includes a top plate and a bottom plate, the top plate and the bottom plate are disposed opposite to each other along a first direction, the reinforcing plate is located between the top plate and the bottom plate, at least one of the reinforcing plates is connected to the top plate and the bottom plate, and the first direction is a height direction of the box.

In some embodiments, a cooling flow channel is provided on at least one of the top plate and the bottom plate.

In some embodiments, the cooling flow channel is integrally formed with the top plate, or the cooling flow channel is integrally formed with the bottom plate.

In some embodiments, a plurality of cooling channels are provided on the top plate or the bottom plate;

the battery pack further comprises a liquid inlet confluence piece and a liquid outlet confluence piece which are distributed at two ends of the sub-box body along the second direction, and a liquid inlet joint and a liquid outlet joint which are distributed at two ends of the sub-box body along the 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 liquid inlet converging piece is internally provided with a liquid inlet converging flow passage, and the liquid outlet converging flow passage is internally provided with a liquid outlet converging flow passage; the entry of feed liquor conflux runner with the feed liquor joint intercommunication, the export of feed liquor conflux runner with the entry intercommunication of cooling runner, the export of cooling runner with go out the entry intercommunication that the liquid conflux runner, the export that goes out the liquid conflux runner with go out liquid joint intercommunication.

the battery pack also comprises a liquid inlet joint, a liquid outlet joint, and a current collecting piece and a switching piece which are distributed at two ends of the sub-box body along a second direction, wherein the liquid inlet joint, the liquid outlet joint and the current collecting piece are positioned at the same end of the sub-box body;

the flow collecting piece comprises a first flow collecting piece and a second flow collecting piece, a first flow collecting flow channel is arranged in the first flow collecting piece, a second flow collecting flow channel is arranged in the second flow collecting piece, a switching flow channel is arranged in the switching piece, and the cooling flow channel comprises a first branch flow channel and a second branch flow channel;

the inlet of the first collecting flow channel is communicated with the liquid inlet connector, the outlet of the first collecting flow channel is communicated with the inlet of the first shunting flow channel, the outlet of the first shunting flow channel is communicated with the inlet of the switching flow channel, the outlet of the switching flow channel is communicated with the inlet of the second shunting flow channel, the outlet of the second shunting flow channel is communicated with the inlet of the second collecting flow channel, and the outlet of the second collecting flow channel is communicated with the liquid outlet connector.

In some embodiments, the current collecting member is an integrally formed member, and a partition plate is disposed inside the current collecting member to partition the inside of the current collecting member into the first current collecting flow channel and the second current collecting flow channel.

In some embodiments, when the box body comprises a sub-box body, the first sub-flow passage and the second sub-flow passage are arranged on the top plate of the sub-box body, or the first sub-flow passage and the second sub-flow passage are arranged on the bottom plate of the sub-box body;

when the tank body comprises a plurality of sub-tank bodies, the top plate of the sub-tank body connected with the first collecting piece is provided with the first branched runner, and the top plate of the sub-tank body connected with the second collecting piece is provided with the second branched runner; or the bottom plate of the sub-tank body connected with the first flow collecting piece is provided with the first branched runner, and the bottom plate of the sub-tank body connected with the second flow collecting piece is provided with the second branched runner.

In some embodiments, the plurality of reinforcing plates are arranged in a third direction inside the sub-box body, and the reinforcing plates extend in a second direction; the second direction is the width direction of the box body, and the third direction is the length direction of the box body; or, the second direction is the length direction of the box body, and the third direction is the width direction of the box body.

In some embodiments, at least one of the top plate and the bottom plate is integrally formed with the reinforcement plate.

In some embodiments, the box body further comprises a first edge beam and a second edge beam distributed at two ends of the box body along a third direction;

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

In some embodiments, the box body includes a plurality of sub-boxes arranged along a third direction, the sub-boxes at two ends of the plurality of sub-boxes in the third direction are end sub-boxes, one of the end sub-boxes is fixedly connected to the first edge beam, and the other of the end sub-boxes is fixedly connected to the second edge beam.

In some embodiments, the sub-box has a first end and a second end oppositely arranged along the second direction, at least one of the first end and the second end is provided with an opening, the box is further provided with an end plate for closing the opening, and the opening corresponds to at least one end plate;

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

In some embodiments, the length of the receiving cavity in the second direction is greater than 500 mm;

the second direction is the length direction of the sub-box body, or the second direction is the width direction of the sub-box body.

In some embodiments, the pole piece string is greater than 400mm in length; the pole core groups comprise 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 groups along a second direction, and the first electrode leading-out part of one pole core group in two adjacent pole core groups in the pole core string is electrically connected with the second electrode leading-out part of the other pole core group;

In some embodiments, a plurality of pole core strings are arranged in the accommodating cavity, and are sequentially arranged along the second direction of the pole core group and electrically connected; the second direction is the length direction of the box body, or the second direction is the width direction of the box body.

In some embodiments, the plurality of pole core groups making up a pole core string are encapsulated within one encapsulation film; the pole core group comprises a pole core group main body, a first electrode leading-out part and a second electrode leading-out part, wherein the first electrode leading-out part and the second electrode leading-out part are used for leading out current; and the packaging part is formed at the position of the packaging film opposite to the first electrode lead-out part and/or the second electrode lead-out part so as to separate the adjacent two polar core group main bodies.

In some embodiments, each pole core group is encapsulated in an encapsulating film to form pole core assemblies, which are connected in series.

On the other hand, the utility model discloses an electric motor car, including the aforesaid battery package.

According to the utility model has the advantages that: the cooling flow channel is arranged on the sub-box body, the sub-box body can serve as a liquid cooling piece, and the liquid cooling piece does not need to be additionally arranged, so that the quantity of parts is reduced, the cost is saved, the cooling liquid in the flow channel can directly cool the pole core string, and the heat dissipation effect of the battery pack is improved; moreover, the pole piece cluster that this application adopted is installed in the box of battery package, and it has left out battery case and the structure (for example end plate, curb plate and fastener etc.) that constitutes the battery module 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 in addition, the packaging efficiency is high, is favorable to reduction in production cost. Moreover, the battery pack box body is simple in structure, low in manufacturing cost and high in space utilization rate.

Drawings

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

Fig. 2 is an exploded view of a battery pack according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the box body including a sub-box body according to an embodiment of the present invention.

Fig. 4A is a schematic structural diagram of the connection between the box body and the liquid inlet converging piece and the liquid outlet converging piece according to an embodiment of the present invention.

Fig. 4B is a cross-sectional view of the box body connected to the liquid inlet manifold and the liquid outlet manifold according to an embodiment of the present invention.

Fig. 5A is a schematic structural view of a tank body connected with a flow collecting member and an adapter member according to another embodiment of the present invention.

Fig. 5B is a cross-sectional view of a tank coupled to a manifold and an adapter according to another embodiment of the present invention.

Fig. 6A is a schematic structural view of a tank body connected with a flow collecting member and an adapter member according to another embodiment of the present invention.

Fig. 6B is a cross-sectional view of a tank coupled to a manifold and an adapter according to another embodiment of the present invention.

Fig. 7 is an exploded view of a battery pack according to another embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a box body including a plurality of sub-box bodies according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of a battery pack according to another embodiment of the present invention.

Fig. 10A is a schematic structural view of a box body connected to a liquid inlet converging piece and a liquid outlet converging piece according to another embodiment of the present invention.

Fig. 10B is a cross-sectional view of the connection of the box body with the liquid inlet manifold and the liquid outlet manifold according to another embodiment of the present invention.

Fig. 11A is a schematic structural view of a tank body connected with a flow collecting member and an adapter member according to another embodiment of the present invention.

Fig. 11B is a cross-sectional view of a tank coupled to a header and an adapter according to another embodiment of the present invention.

Fig. 12A is a schematic structural view of a tank body connected with a collecting member and an adapter member according to another embodiment of the present invention.

Fig. 12B is a cross-sectional view of a tank coupled to a header and an adapter according to another embodiment of the present invention.

Fig. 13 is a schematic structural diagram of a pole core string according to an embodiment of the present application.

Fig. 14A 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. 14B is an exploded perspective view of a pole piece assembly and a fixed spacer ring according to an embodiment of the present disclosure.

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 view of two pole core strings connected in series in the same containing cavity according to an 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 cores connected in series and in parallel in two accommodating cavities according to an embodiment of the present application.

Fig. 20 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. 21 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. 22 is a schematic structural diagram of an encapsulation film encapsulating a pole core group according to an embodiment of the present application.

Fig. 23 is a schematic structural view of an encapsulation film encapsulating a pole core group according to another embodiment of the present application.

The reference numerals in the specification are as follows:

1. a battery pack;

10. a box body;

100. a tank body; 101. a sub-box body; 1011. an end sub-box; 102. a top plate; 103. a base plate; 104. an installation part; 105. mounting holes; 106. a first edge beam; 107. a second edge beam; 108. an opening; 109. an end plate;

110. a cooling flow channel; 1101. a first shunt passage; 1102. a second branch flow channel;

120. a liquid inlet converging piece; 121. liquid outlet confluence pieces; 122. a current collector; 123. a first current collecting member; 124. a second current collecting member; 125. an adapter; 126. a liquid inlet joint; 127. a liquid outlet joint;

130. a connecting member;

140. a first end; 150. a second end;

200. a reinforcing 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 protective cover;

700. a distribution box.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like 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 and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The application provides a battery pack 1, and battery pack 1 includes box 10, and box 10 includes case body 100, and case body 100 includes at least one subbox 101. The box body 10 is further provided with an installation part 104, the installation part 104 is arranged on the box body 10, and the installation part 104 is used for being fixedly connected with an external load. The sub-tank 101 is further provided with a cooling channel 110. The battery pack 1 further includes a plurality of pole core strings 401, the plurality of pole core strings 401 are electrically connected to each other, the pole core string 401 includes a plurality of pole core groups 400 connected in series, and the pole core groups 400 are encapsulated in an encapsulation film 500. In addition, the battery pack 1 further comprises at least one reinforcing plate 200, the reinforcing plate 200 is located in the sub-case 101, the reinforcing plate 200 divides the interior of the sub-case 101 into a plurality of accommodating cavities 300, and at least one of the accommodating cavities 300 is provided with at least one pole core string 401.

It should be noted that, it is equipped with at least one to hold the intracavity the utmost point core cluster can be held the intracavity and be provided with an utmost point core cluster, also can be equipped with a plurality of utmost point core clusters within, and the selection to holding the utmost point core cluster quantity of intracavity can set up according to the demand. The plurality of pole core strings are electrically connected with each other, and can be a plurality of pole core strings arranged in the containing cavities and connected in series or in parallel, or the pole core strings arranged in two adjacent containing cavities and connected in series or in parallel; the pole core strings arranged in two separated containing cavities can also be electrically connected in series or in parallel. The plurality of pole core strings are electrically connected to each other without further limitation in the present application.

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

In the present application, for convenience of describing the connection relationship of the structures inside the battery pack, the height direction of the case is referred to as a first direction in the embodiments of the present application. The width direction of the box body is called as a second direction, and the length direction of the box body is called as a third direction; alternatively, the longitudinal direction of the case is referred to as a second direction, and the width direction of the case is referred to as second and third directions. The first direction, the second direction and the third direction are different. In the embodiments of the present application, the first direction, the second direction and the third direction are defined as two directions perpendicular to each other. The first direction is an X direction, the second direction is a Z direction, and the third direction is a Y direction. It is understood that in other embodiments, any two of the first direction, the second direction, and the third direction may be at an angle, such as 60 °, 75 °, and so forth.

The battery pack of the present application is different from the conventional battery pack in structure and built-in battery structure. The traditional single battery is characterized in that a pole core is arranged in a battery shell and is packaged through cover plates at two ends, and then the single battery, end plates, boundary beams, connecting sheets and other structures and components are assembled into a battery module. The existing battery pack is complex in design structure, various in part types and high in part cost.

And in this application, with utmost point core group encapsulation in the encapsulation membrane, a plurality of utmost point core group concatenations form utmost point core cluster to with utmost point core cluster setting in the box of battery package, in order to realize improving the sealed effect of utmost point core cluster through encapsulation membrane and box to utmost point core cluster double seal. And, the pole piece cluster only encapsulates through the encapsulation membrane, for current battery cell or battery module, has left out fixed knot and has constructed, and then has improved the space utilization in the battery package, has alleviateed the weight of battery package and has improved the energy density of battery package. In addition, as shown in fig. 1 to 3 and fig. 7 to 9, in the present application, by providing a plurality of reinforcing plates 200 inside the sub-tank 101, the internal space of the sub-tank 101 is partitioned into a plurality of accommodation cavities 300, and the pole core string 401 is provided inside the accommodation cavities 300. In the embodiment of the present application, the sub-box 101 includes a bottom plate 103 and a top plate 102, and the bottom plate 103 and the top plate 102 are disposed along a first direction. A plurality of reinforcing plates 200 are arranged inside the sub-tank 101, the reinforcing plates 200 are arranged along the third direction and extend along the second direction, the reinforcing plates 200 are arranged between the top plate 102 and the bottom plate 103, and the plurality of reinforcing plates 200 are in contact with and connected with at least one of the top plate 102 and the bottom plate 103 of the sub-tank 101. In some embodiments, the reinforcement panel 200 contacts and connects the top and

bottom panels

102, 103 of the sub-tank 100, thereby forming an "I" configuration. The structure has higher strength and rigidity, so that the shell of the battery pack has better performances of bearing, impact resistance, extrusion resistance and the like. And, when installing this kind of battery package 1 on whole car, this kind of battery package 1's structural strength can regard as a part of whole car structural strength to can promote whole car structural strength, be favorable to realizing the whole lightweight design requirement of electric motor car, also reduce the design and the manufacturing cost of whole car simultaneously. In addition, be equipped with in the box 10 and hold chamber 300 more, every holds and establishes utmost point core cluster 401 in the chamber 300, and above-mentioned structural design can guarantee can not influence all the other utmost points core clusters that hold the intracavity when certain utmost point core cluster that holds the intracavity takes place safety problem, has guaranteed the security of utmost point core cluster and then has also improved the security of battery package.

In addition, a liquid cooling member is additionally disposed in a conventional battery pack, and the liquid cooling member is used to cool and dissipate heat of the battery module or the single battery. And establish cooling flow channel in this application with on the subbox, specifically, establish cooling flow channel on the roof and/or the bottom plate of subbox, above-mentioned structural design has reduced the setting of liquid cooling spare in traditional battery package, reduces the manufacturing cost of battery package and has also improved the space utilization in the battery package. In addition, since the cooling flow passage is provided in the sub-tank, the cooling flow passage provided in the sub-tank is integrally formed with the sub-tank. Adopt integrated into one piece to become the processing mode, can guarantee that the inside cooling runner of subbox can not appear the scheduling problem of weeping, reduced because of the safety risk that the cooling runner set up and causes, improved the security of battery package. In addition, because the cooling runner that establishes on the subbox and the intracavity that holds in the subbox sets up the utmost point core cluster, consequently the cooling liquid of the cooling runner circulation on the subbox can with the further indirect contact of utmost point core cluster, and then improved the radiating efficiency of battery package and promoted the security of battery package.

As shown in fig. 3, when the tank body 100 is a sub-tank 101 in the tank 10, a plurality of reinforcing plates 200 are provided inside the sub-tank 101, the plurality of reinforcing plates 200 are arranged in the third direction, and the reinforcing plates 200 extend in the second direction. The sub-casing 101 includes a top plate 102 and a bottom plate 103, the top plate 102 and the bottom plate 103 are oppositely disposed in a first direction in the sub-casing 101, and at least one reinforcing plate 200 is connected to the top plate 102 and the bottom plate 103. In some embodiments, a plurality of the reinforcement plates 200 within the sub-tank 101 connect the top plate 102 and the bottom plate 103; in other embodiments, the reinforcing plate 200 is connected to the top plate 102, or the reinforcing plate 200 is connected to the bottom plate 103. And the reinforcing plate 200 is located between the top plate 102 and the bottom plate 103. In some embodiments, at least one of the top plate 102 and the bottom plate 103 is integrally formed with the reinforcement plate 200. That is, the top plate 102 and the reinforcing plate 200 are integrally formed, or the bottom plate 103 and the reinforcing plate 200 are integrally formed, or the top plate 102 and the bottom plate 103 and the reinforcing plate 200 are integrally formed.

It can be understood that, in this application, the roof and the bottom plate form "worker" style of calligraphy structure after being connected with the reinforcing plate, and this "worker" type structure makes the box of battery package wholly take the honeycomb structure, and this kind of structure has higher intensity and rigidity to can satisfy the requirement of the performance such as bearing of box, crashproof and anti extrusion. Moreover, the box body has relatively simple structure and higher space utilization rate. When installing this kind of battery package on whole car, the structural strength of this battery package can regard as a part of whole car structural strength to can promote the structural strength of whole car, be favorable to realizing the design requirement of whole car lightweight of electric motor car, also reduce the design and the manufacturing cost of whole car simultaneously.

In this application, the sub-tank 101 is provided with a cooling channel 110, further, at least one of the top plate 102 and the bottom plate 103 of the sub-tank 101 is provided with the cooling channel 110, in some embodiments, the top plate 102 is provided with the cooling channel 110, or the bottom plate 103 is provided with the cooling channel 110, or both the top plate 102 and the bottom plate 103 are provided with the cooling channel 110. However, in other embodiments, the cooling channels may be disposed inside the reinforcing plate 200. Therefore, in the present application, the arrangement position of the cooling flow channel can be adjusted according to actual requirements. In this application, the cooling flow channel is integrally formed in the top plate, or the cooling flow channel is integrally formed in the bottom plate. Above-mentioned structural design can improve the space utilization of battery package and reduce the weight of battery package to can further indirectly contact the utmost point core cluster, improve the radiating effect to utmost point core cluster in the battery package, improve the radiating efficiency of battery package, reduce the safe risk of battery package.

In this application, a plurality of cooling channels are provided on the top plate or the bottom plate. In the embodiment of the present application, only the cooling flow channel is disposed on the bottom plate of the sub-tank, and the manner and structure of the cooling flow channel disposed on the top plate of the sub-tank are similar to those of the cooling flow channel disposed on the bottom plate, and no further explanation is provided in the embodiment of the present application. In some embodiments, a bottom plate of the sub-tank is provided with a plurality of cooling channels penetrating through the bottom plate along the second direction. And the cooling flow channel arranged on the bottom plate of the sub-box body is provided with a cooling flow channel inlet and a cooling flow channel outlet.

As shown in fig. 4A-4B, in the first embodiment of the present application, the battery pack 1 further includes a liquid inlet collecting piece 120 and a liquid outlet collecting piece 121 distributed at two ends of the sub-box 101 along the second direction, and a liquid inlet joint 126 and a liquid outlet joint 127 distributed at two ends of the sub-box 101 along the second direction. The liquid inlet converging piece 120 is internally provided with a liquid inlet converging flow passage, and the liquid outlet converging piece 121 is internally provided with a liquid outlet converging flow passage. In some embodiments, the liquid inlet converging piece 120 is integrally formed to form the liquid inlet converging flow passage, and the liquid outlet converging piece 121 is integrally formed to form the liquid outlet converging flow passage. In other embodiments, the liquid inlet converging piece 120 may form a liquid inlet converging flow channel through an internal arrangement structural member, and the liquid outlet converging piece 121 may form a liquid inlet converging flow channel through an internal arrangement structural member, that is, the liquid inlet converging piece 120 and the liquid outlet converging piece 121 are not integrally formed. The liquid inlet confluence piece 120 and the liquid outlet confluence piece 121 are respectively and fixedly connected to two ends of the bottom plate 102 of the sub-box 101, wherein the manner of fixedly connecting the liquid inlet confluence piece 120 and the liquid outlet confluence piece 121 is not limited to bonding, welding and other connection manners, and is not limited herein. In the above embodiment, the connection modes of the liquid inlet/collecting stage 120, the liquid outlet/collecting member 121, the liquid inlet joint 126, the liquid outlet joint 127 and the bottom plate 103 are as follows: the inlet of the liquid inlet converging flow channel is communicated with the liquid inlet joint 126, the outlet of the liquid inlet converging flow channel is communicated with the inlet of the cooling flow channel 110, the outlet of the cooling flow channel 110 is communicated with the inlet of the liquid outlet converging flow channel, and the outlet of the liquid outlet converging flow channel is communicated with the liquid outlet joint 127. The flow path of the cooling liquid in the battery pack is as follows: the liquid inlet joint 126, the liquid inlet confluence piece 120, the bottom plate 103, the liquid outlet confluence piece 121 and the liquid outlet joint 127. In some embodiments, the inlet joint 126 is integrally formed with the inlet manifold 120, and the outlet joint 127 is integrally formed with the outlet manifold 121. In other embodiments, the liquid inlet joint 126 is fixedly connected to the inlet of the liquid inlet converging flow passage of the liquid inlet converging piece 120 by bonding, welding, or the like, and the liquid outlet joint 127 is fixedly connected to the outlet of the liquid outlet converging flow passage of the liquid outlet converging piece 121 by bonding, welding, or the like.

As shown in fig. 5A-6B, in the second embodiment of the present application, the battery pack 1 further includes an inlet connector 126 and an outlet connector 127, and a current collecting member 122 and an adaptor 125 distributed at both ends of the sub-tank in the second direction. The collecting piece 122, the liquid inlet joint 126 and the liquid outlet joint 127 are located at the same end of the sub-tank 101, and the adapter 125 is located at the other end of the sub-tank 101. In the embodiment of the present application, the current collecting member 122 includes a first current collecting member 123 and a second current collecting member 124, the first current collecting member 123 has a first current collecting flow channel therein, the second current collecting member 124 has a second current collecting flow channel therein, and the adaptor 125 has a switching flow channel therein. In some embodiments, the current collecting member 122 is a one-piece member, and a partition plate is disposed inside the current collecting member 122 to partition the inside of the current collecting member into the first current collecting flow channel and the second current collecting flow channel. The adaptor 125 is integrally formed to form the adaptor channel. Namely, the first current collector 123 and the second current collector 124 are integrally formed to form the current collector. A partition plate provided inside the collector 122 partitions the integrally formed collector into a first collector 123 and a second collector 1241. In other embodiments, the first current collector 123, the second current collector 124, and the adapter 125 may form the corresponding internal flow channels by way of an internal structural component, that is, the internal flow channels of the first current collector 123, the second current collector 124, and the adapter 125 are not integrally formed. The flow passages provided in the bottom plate 103 of the sub-tank 101 include a first flow dividing passage 1101 and a second flow dividing passage 1102. The first sub-flow passage 1101 is a part of the cooling flow passage 110 disposed on the bottom plate 103, and the second sub-flow passage 1102 is the rest of the cooling flow passage 110, that is, the first sub-flow passage 1101 and the second sub-flow passage 1102 together form the cooling flow passage 110 disposed on the bottom plate 103. In this embodiment, the connection modes of the first collecting member 123, the second collecting member 124, the adaptor 125, the liquid inlet joint 126, the liquid outlet joint 127 and the bottom plate 103 are as follows: the inlet of the first collecting flow channel is communicated with the liquid inlet joint 126, the outlet of the first collecting flow channel is communicated with the inlet of the first diversion channel 1101, the outlet of the first diversion channel 1101 is communicated with the inlet of the switching flow channel, the outlet of the switching flow channel is communicated with the inlet of the second diversion channel 1102, the outlet of the second diversion channel 1102 is communicated with the inlet of the second collecting flow channel, and the outlet of the second collecting flow channel is communicated with the liquid outlet joint 127. The flow path of the cooling liquid in the battery pack is as follows: the inlet connection 126, the first collecting part 123, the first flow dividing channel 1101 of the base plate 103, the adapter 125, the second flow dividing channel 1102 of the base plate 103, the second collecting part 124 and the outlet connection 127. In some embodiments, the inlet connector 126 is integrally formed with the first collecting member 123, and the outlet connector 127 is integrally formed with the second collecting member 124.

When the tank body 100 includes one sub-tank 101, the first branch flow passage 1101 and the second branch flow passage 1102 are provided on the top plate 102 of the sub-tank 101, or the first branch flow passage 1101 and the second branch flow passage 1102 are provided on the bottom plate 103 of the sub-tank. In the above embodiments, only the bottom plate has the first branch flow channel and the second branch flow channel, and when the sub-tank top plate has the first branch flow channel and the second branch flow channel, the structures and the arrangement manners of the first collecting member, the second collecting member, the adapter member, the liquid inlet connector and the liquid outlet connector are similar to those of the embodiment in which the bottom plate has the first branch flow channel and the second branch flow channel, and the description thereof is not provided in this application.

In the second embodiment, the current collector 122 includes a first current collector 123 and a second current collector 124. In some embodiments, as shown in fig. 5A-5B, when the first collecting member 123 and the second collecting member 124 are integrally formed, that is, the collecting member 122 is an integrally formed member, the inlet connector 126 and the outlet connector 127 are also integrally formed and constitute one component. At this time, the current collecting member 122 may be internally provided with a partition plate to partition the current collecting member 122 into the first current collecting member 123 and the second current collecting member 124, and the first current collecting flow channel and the second current collecting flow channel may be internally partitioned by the current collecting member 122 by providing a partition plate. In other embodiments, as shown in fig. 6A-6B, the first collecting piece 123 and the second collecting piece 124 are two separate pieces, the inlet plug 126 is connected to the first collecting piece 123, and the outlet plug 127 is connected to the second collecting piece 124.

In this application, the box body 100 further includes a plurality of sub-boxes 101. As shown in fig. 7 to 9, the plurality of sub-tanks 101 are arranged side by side in the third direction. The box body 100 further comprises a connecting member 130, and the connecting member 130 connects the two adjacent sub-box bodies 101.

In some embodiments, the connecting member may fixedly connect two adjacent sub-cases by bonding, connecting, welding, or the like. As shown in fig. 8 to 9, after the plurality of sub-cases 101 are fixed together by the connecting member 130, the top plates 102 of the plurality of sub-cases 101 are fixed together to form a top plate of the case body 100, and the bottom plates of the plurality of sub-cases 101 are fixed together to form a bottom plate of the case body 100. In the following embodiments, the cooling flow channels 110 on the bottom plate 103 of the plurality of sub-cases 101 in the case body 100 are taken as an example for explanation, and the cooling flow channels 110 on the top plate 102 of the case body 100 including the plurality of sub-cases 101 are arranged in a similar manner and structure to the cooling flow channels 110 on the bottom plate 103, and will not be described in detail herein.

In the third embodiment, as shown in fig. 10A to 10B, the cooling channels 110 are provided in the bottom plates 103 of the plurality of sub-tanks 101. The inlet and outlet flow-merging

members

120, 121, the inlet joint 126 and the outlet joint 127 are arranged in a similar manner and are designed in a similar manner as the second embodiment, and will not be described in detail herein. In the above embodiment, the connection modes of the liquid inlet/collecting stage 120, the liquid outlet/collecting member 121, the liquid inlet joint 126, the liquid outlet joint 127 and the bottom plate 103 are as follows: the inlet of the liquid inlet converging flow channel is communicated with the liquid inlet joint 126, the outlet of the liquid inlet converging flow channel is communicated with the inlet of the cooling flow channel 110, the outlet of the cooling flow channel 110 is communicated with the inlet of the liquid outlet converging flow channel, and the outlet of the liquid outlet converging flow channel is communicated with the liquid outlet joint 127.

In the fourth embodiment, as shown in fig. 11A to 12B, the cooling flow passage 110 on the bottom plate 103 of the tank body 100 has a first branch flow passage 1101 and a second branch flow passage 1102. Further, the first diversion channel 1101 is arranged on the bottom plate 103 of the sub-tank 101 connected with the first collecting member 123, and the second diversion channel 1102 is arranged on the bottom plate 103 of the sub-tank 101 connected with the second collecting member 124; in other embodiments, the first diversion channel 1101 is provided on the bottom plate 103 of the sub-tank connected to the first collecting member 123, and the second diversion channel 1102 is provided on the bottom plate 103 of the sub-tank connected to the second collecting member 124. As shown in fig. 11A to 12B, when three sub-cases 101 are included in the case body 100, the cooling flow channel 110 on the bottom plate 103 of the sub-case provided at the third upper end of the case body 100 is defined as the first sub-flow channel 1101, and the cooling flow channels 110 on the bottom plates 103 of the remaining two sub-cases 101 are defined as the second sub-flow channels 1102. When the box body 100 includes a plurality of sub-box bodies 101, the first shunt passage 1101 and the second shunt passage 1102 may be freely combined and matched according to requirements, and this embodiment of the present application is only one of the modes, and the other modes are not further limited. In this embodiment, the arrangement and structure of the components are similar to those in the second embodiment except for the selection of the first branch flow passage and the second branch flow passage, and will not be described in detail herein.

In some embodiments, the top plate and the top plate of the sub-tank are both provided with cooling flow channels, and the top plate are provided with cooling flow channels in a manner similar to that of the bottom plate (e.g., a liquid inlet converging piece and a liquid outlet converging piece, or a liquid collecting piece and an adapter piece, and a liquid inlet joint and a liquid outlet joint), and the configuration and the structural design of the cooling flow channels are not further explained in this application. When the cooling flow channels are arranged on the top plate of the sub-tank body and the top plate, the number of the other parts (such as the liquid inlet confluence piece and the liquid outlet confluence piece, or the liquid collecting piece and the adapter piece, and the liquid inlet joint and the liquid outlet joint) is twice that of the other parts (such as the liquid inlet confluence piece and the liquid outlet confluence piece, or the liquid collecting piece and the adapter piece, and the liquid inlet joint and the liquid outlet joint) when the cooling flow channels are arranged on the bottom plate.

In the present application, as shown in FIGS. 1-3 and 7-9, the enclosure 10 further includes first and second side beams 106, 107 distributed at opposite ends of the enclosure body 199 along a third direction. In the embodiment of the present application, as shown in fig. 1 to 3, if the box body 100 includes only one sub-box 101, the top plate 102 and the bottom plate 103 of the sub-box 101 are connected to the first side beam 106 and the second side beam 107, respectively.

Further, the sub-box 101 is integrally formed with the first side member 106 and the second side member 107. The structural strength and rigidity of the battery pack are ensured by adding the first edge beam and the second edge beam.

In the present application, as shown in fig. 7 to 9, if the box body 100 includes a plurality of sub-boxes 101 arranged in the third direction, the sub-boxes 101 located at both ends of the box body 100 in the third direction among the plurality of sub-boxes 101 are referred to as end sub-boxes 1011. One of the end sub-boxes 1011 is fixedly connected to the first side beam 106, and the other is fixedly connected to the second side beam 107.

Further, the end sub-box 1011 connected to the first side rail 106 is integrally formed with the first side rail 106, and/or the end sub-box 1011 connected to the second side rail 107 is integrally formed with the second side rail 107. The structural strength and rigidity of the battery pack are ensured by adding the first edge beam and the second edge beam.

In the present application, the case 10 is provided with a mounting portion 104. In some embodiments, as shown in fig. 1-3 and 7-9, the first and second side rails 106, 107 of the enclosure 10 are provided with mounting portions 104, and the mounting portions 104 are provided with mounting holes 105. The mounting holes 105 are used for fasteners (e.g., bolts or rivets) to be inserted therethrough to couple and fix the battery pack to an external load.

Further, the mounting hole 105 provided in the first side sill 106 penetrates the first side sill 106 in the first direction, and the mounting hole 105 provided in the second side sill 107 penetrates the second side sill 107 in the first direction. It will be appreciated that the axial direction of the mounting hole may also be arranged at an angle to the first direction, for example 10 ° or 15 °.

Further, there are a plurality of the mounting holes 105, and the plurality of the mounting holes 105 are sequentially arranged on the mounting portion along the second direction. The setting of installation department 104 and mounting hole 105 can guarantee the stability of battery package installation to the car after, improves the structural strength of whole car, is favorable to realizing the lightweight design requirement of whole car of electric motor car, also reduces the design and the manufacturing cost of whole car simultaneously.

In the embodiment of the present application, as shown in fig. 1 to 3 and fig. 7 to 9, the sub-tank 101 has a first end 140 and a second end 150 oppositely disposed along the second direction, and at least one of the first end 140 and the second end 150 is provided with an opening 108. The box body 10 is further provided with an end plate 109 for closing the opening 108, and the opening 108 corresponds to at least one end plate 109. Above-mentioned structural design can overhaul or when changing, only through open the end plate can to alleviate the operation. It will be appreciated that the provision of openings in the sub-enclosure also enables the pole core string to be installed. A plurality of utmost point core clusters can be installed to holding in the chamber through the opening, and this kind of mounting means is easy and simple to handle, and then reduces the operation degree of difficulty that the battery package equipment is to improve the structural strength of battery package.

Further, as shown in fig. 2 and 8, the first end 140 and the second end 150 are both provided with an opening 108, and the opening 108 is correspondingly provided with an end plate 109. Such structural design can guarantee that battery package one end can't open the end plate and can open the end plate from the other end, and then accomplishes the maintenance and the change of battery package.

In the present application, as shown in fig. 2, if the box body 100 includes only one sub-box 101, the end plate 109 corresponding to the opening 108 is only one end plate 109; if the box body 100 includes a plurality of sub-boxes 101, the end plate 109 corresponding to the opening 108 may be a single end plate 109, or may be formed by combining a plurality of end plates 109. In the embodiment of the present application, as shown in fig. 8, when three sub-cases 101 are included in the case body 100, the end plate 109 of the case body 100 is only the end plate 109 of the sub-case 101; as shown in fig. 9, when the tank body 100 includes three sub-tanks 101, the tank body end plate 109 is formed by combining the end plates 109 of the three sub-tanks 101.

In addition, in the embodiment of the present application, as shown in fig. 1 to 2 and fig. 7, specifically, the inlet joint 126 and the outlet joint 127 extend and are fixed to the end plate 109 in a non-limiting manner.

Further, the battery pack 1 is further provided with a distribution box 700, and the distribution box 700 is arranged on one side of the end plate far away from the box body 10; the inlet fitting 126 and the outlet fitting 127 extend and are secured to the electric box 700 and/or the end plate 109, without limitation.

In the embodiment of the present application, an insulating fixing member is further disposed at the opening 108, and the insulating fixing member is disposed between the opening 108 and the end plate 109 along the second direction of the box 10. The insulating performance of battery package can be improved in the setting of insulating mounting.

In this application, 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 pole core string 401 disposed in the accommodating cavity 300 can be made longer, that is, more pole core strings 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.

As shown in fig. 2, 7 and 13, 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.

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, a plurality of pole piece strings 401 in the same housing 300 are connected in series.

The first pole-core group 400 of one pole-core string 401 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 pole core strings 401 in the same accommodating cavity 300 are connected in series in the connection mode, so that the wiring space of the connecting line can be saved. In other embodiments, other series connections may be used.

Referring to fig. 17, in a further embodiment, a plurality of pole piece strings 401 in 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. 17, 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.

Specifically, the first electrode leading-out part 410 of the first pole core group 400 of one pole core string 401 in two adjacent pole core strings 401 is located on the same side as the first electrode leading-out part 410 of the first pole core group 400 of the other pole core string 401, and the second electrode leading-out part 420 of the last pole core group 400 of one pole core string 401 in two adjacent pole core strings 401 is located on the same side as the second electrode leading-out part 420 of the last pole core group 400 of the other pole core string 401.

The pole core strings 401 in the same accommodating cavity 300 are connected in parallel by adopting the connection mode, so that the wiring space of the connecting wire can be saved. In other embodiments, other parallel connections may be used.

Further, several cases of electrically connecting the pole piece strings 401 of two adjacent receiving cavities 300 are specifically described below, and it should be noted that the following description is only an example, and the embodiments of the present application are not limited thereto:

referring to fig. 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, electrically connecting a first pole core string 401 of one accommodating cavity 300 in the third direction with a second pole core string 401 of another accommodating cavity 300 in the third direction may be further included, 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 the two adjacent accommodating cavities 300 are connected in series in the connection mode, so that the wiring space of the connecting line can be saved. In other embodiments, other series connections may be used.

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

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

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

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

Referring to fig. 19, in a further embodiment, the pole piece strings 401 in two adjacent receiving cavities 300 are connected in parallel.

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

Specifically, the first electrode drawing part 410 of the first pole core group 400 of one of the pole core strings 401 in one of the two adjacent accommodating cavities 300 is located on the same side as the first electrode drawing part 410 of the first pole core group 400 of one of the pole core strings 401 in the other accommodating cavity 300, and the second electrode drawing part 420 of the last pole core group 400 of one of the pole core strings 401 in one of the two adjacent accommodating cavities 300 is located on the same side as the second electrode drawing part 420 of the last pole core group 400 of one of the pole core strings 401 in the other accommodating cavity 300.

The pole core strings 401 in the two adjacent accommodating cavities 300 are connected in parallel in the connection mode, so that the wiring space of the connecting wire can be saved. In other embodiments, other parallel connections may be used.

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

Specifically, the first pole-core group 400 of one pole-core string 401 disposed adjacent to the second accommodation cavity 300 in the first accommodation cavity 300 is electrically connected to the first pole-core group 400 of one pole-core string 401 disposed adjacent to the first accommodation cavity 300 in the second accommodation cavity 300, and the last pole-core group 400 of one pole-core string 401 disposed adjacent to the second accommodation cavity 300 in the first accommodation cavity 300 is electrically connected to the last pole-core group 400 of one pole-core string 401 disposed adjacent to the first accommodation cavity 300 in the second accommodation cavity 300. It can be understood that the wiring space of the connecting line can be saved by adopting the connecting mode.

As for the way that one pole core string 401 is arranged in each accommodating cavity 300, the way of electrically connecting the pole core strings 401 of two adjacent accommodating cavities 300 is similar to the way described above, and only briefly described below:

in some embodiments, as shown in fig. 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. 14A and 14B 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. 22, 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. 23, 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.

The application also provides an electric vehicle, which comprises a vehicle body and the battery pack 1, wherein the battery pack 1 is fixed on the vehicle body through the mounting part 104. The application provides an electric motor car, when installing this kind of battery package 1 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 motor car. 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.

In the description of the present invention, 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A battery pack, comprising:

2. The battery pack according to claim 1, wherein the sub-case includes a top plate and a bottom plate, the top plate and the bottom plate being disposed opposite to each other in a first direction, the reinforcing plate being located between the top plate and the bottom plate, at least one of the reinforcing plates being connected to the top plate and the bottom plate, the first direction being a height direction of the sub-case.

3. The battery pack of claim 2, wherein at least one of the top plate and the bottom plate has a cooling channel formed therein.

4. The battery pack of claim 3, wherein the cooling flow channel is integrally formed in the top plate or the cooling flow channel is integrally formed in the bottom plate.

5. The battery pack of claim 3, wherein the top plate or the bottom plate has a plurality of cooling channels;

6. The battery pack of claim 3, wherein the top plate or the bottom plate has a plurality of cooling channels;

7. The battery pack according to claim 6, wherein the current collecting member is an integrally formed member, and a partition plate is provided inside the current collecting member to partition the inside of the current collecting member into the first current collecting flow channel and the second current collecting flow channel.

8. The battery pack according to claim 6, wherein when the case body comprises a sub-case, the first sub-flow passage and the second sub-flow passage are provided on a top plate of the sub-case, or the first sub-flow passage and the second sub-flow passage are provided on a bottom plate of the sub-case;

9. The battery pack according to claim 1, wherein a plurality of the reinforcing plates are provided, the reinforcing plates are arranged in the third direction inside the sub-case, and the reinforcing plates extend in the second direction; the second direction is the width direction of the box body, and the third direction is the length direction of the box body; or, the second direction is the length direction of the box body, and the third direction is the width direction of the box body.

10. The battery pack of claim 2, wherein at least one of the top plate and the bottom plate is integrally formed with the reinforcing plate.

11. The battery pack of claim 1, wherein the case body further comprises a first edge beam and a second edge beam distributed at both ends of the case body in a third direction;

12. The battery pack according to claim 11, wherein the case body includes a plurality of sub-cases arranged in a third direction, and of the plurality of sub-cases, the sub-cases at both ends in the third direction are end sub-cases, one of the end sub-cases is fixedly connected to the first edge beam, and the other of the end sub-cases is fixedly connected to the second edge beam.

13. The battery pack of claim 1, wherein the sub-case has a first end and a second end oppositely disposed in the second direction, at least one of the first end and the second end is provided with an opening, the case is further provided with an end plate closing the opening, and the opening corresponds to at least one of the end plates;

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

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

16. The battery pack according to claim 15, wherein a plurality of the pole core strings are disposed in the accommodating cavity, and are sequentially arranged and electrically connected along the second direction of the pole core group;

17. 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.

18. The battery pack according to claim 1, wherein each of the pole core groups is encapsulated in one encapsulating film to form pole core assemblies, and the pole core assemblies are connected in series.

19. An electric vehicle comprising the battery pack according to any one of claims 1 to 18.