CN115425322A

CN115425322A - Battery pack and vehicle

Info

Publication number: CN115425322A
Application number: CN202211065202.5A
Authority: CN
Inventors: 宁兴江; 郭红艳; 王鹏; 潘福中; 李常珞; 牛宏军; 牛亚琪
Original assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zhejiang Zeekr Intelligent Technology Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zhejiang Zeekr Intelligent Technology Co Ltd
Priority date: 2022-09-01
Filing date: 2022-09-01
Publication date: 2022-12-02

Abstract

The invention provides a battery pack and a vehicle, and relates to the technical field of vehicles. The battery pack comprises a battery pack, a confluence assembly and a first cooling plate; the battery core group comprises a plurality of battery cores, the battery cores are sequentially arranged along a first direction, each battery core comprises an explosion-proof valve and two polar columns, the explosion-proof valves and the two polar columns are positioned at the tops of the battery cores, two parallel converging assemblies are arranged on the battery core group, and the converging assemblies are welded with the polar columns of the adjacent battery cores; first cooling plate sets up on the assembly that converges, and first cooling plate has the portion of dodging the explosion-proof valve of electric core. The vehicle includes a battery pack. Through setting up first cooling plate on the assembly that converges, first cooling plate is to converging assembly and utmost point post and cooling down to can avoid appearing converging the higher problem of utmost point post temperature of assembly and electric core, and then can make the vehicle can charge and can work under high dynamic nature under higher charge magnification.

Description

Battery pack and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to a battery pack and a vehicle.

Background

With the national vigorous popularization of new energy fields, electric vehicles have become the mainstream trend in the future. The battery pack is used as a power supply component which is the most core of the whole vehicle, and determines key indexes of the driving range, cost, service life, safety, maintainability and the like of the whole vehicle. The battery pack generates a large amount of heat during the rapid charging and rapid discharging processes, and if the generated heat cannot be dissipated rapidly and effectively, the heat accumulation may cause safety accidents such as heating, fire, explosion and the like of the battery.

In the related art, the battery pack comprises a plurality of battery cells, liquid cooling plates are arranged at the bottoms of the battery cells, and the liquid cooling plates can be arranged at the bottoms of the battery cells, among the large surfaces of the battery cells, and among the side surfaces of the battery cells, so that the battery pack can be cooled and radiated; the top of a plurality of electric cores sets up the assembly that converges, converges the utmost point post welded connection of assembly and a plurality of electric cores to be convenient for derive the inside electric current of a plurality of electric cores.

However, when the battery pack is charged at a higher charging rate, the temperature of the bus assembly and the terminal of the battery cell is higher.

Disclosure of Invention

The invention provides a battery pack and a vehicle, and aims to solve the problem that when the battery pack is charged at a high charging rate, the temperatures of a confluence assembly and a pole of a battery cell are high.

In one aspect, the present invention provides a battery pack, including a battery cell pack, a bus bar assembly, and a first cooling plate;

the battery core group comprises a plurality of battery cores, the battery cores are sequentially arranged along a first direction, each battery core comprises an explosion-proof valve and two pole columns, the explosion-proof valves and the two pole columns are positioned at the tops of the battery cores, the battery core group is provided with two parallel confluence assemblies, and the confluence assemblies are welded and connected with the pole columns of the adjacent battery cores;

the first cooling plate is arranged on the confluence assembly, the first cooling plate is provided with an avoiding part for avoiding the explosion-proof valve of the battery cell, and the first cooling plate is used for cooling the confluence assembly and the pole.

Optionally, a plurality of groups of the electric core groups are sequentially arranged along a second direction, and the first direction is perpendicular to the second direction.

Optionally, the first cooling plate includes a plurality of cooling portions, the plurality of cooling portions are sequentially arranged at intervals in the second direction, and each cooling portion corresponds to one row of the junction assemblies;

the avoiding part is a space between the adjacent cooling parts.

Optionally, the cooling portion is a harmonica tube type cooling portion, the cooling portion has a first end and a second end, the first end and the second end are arranged oppositely in the first direction, a plurality of cooling channels are arranged on the cooling portion, and the plurality of cooling channels are arranged at intervals in the second direction;

the cooling device further comprises a first integrated pipe and a second integrated pipe, wherein the first integrated pipe is communicated with the first ends of the plurality of cooling portions, and the second integrated pipe is communicated with the second ends of the plurality of cooling portions.

Optionally, the cooling system further comprises a first joint and a second joint, the first integrated pipe comprises a first part and a second part which are not communicated, the first joint is arranged on the first part and is communicated with the first part, the second joint is arranged on the second part and is communicated with the second part, the first joint is used for flowing in the liquid cooling medium, and the second joint is used for flowing out the liquid cooling medium.

Optionally, the cooling portion is a flexible insulating cooling plate or a rigid insulating cooling plate.

Optionally, the cooling portion is a phase change material cooling plate.

Optionally, a heat-conducting structural adhesive or a heat-conducting pad is disposed between the first cooling plate and the junction assembly.

Optionally, the cooling device further comprises a fireproof belt, wherein the fireproof belt is arranged on the first cooling plate and used for preventing the insulation performance of the first cooling plate from being reduced.

In another aspect, the present invention provides a vehicle comprising a chassis and a battery pack as described above;

the battery pack is mounted on the chassis.

The invention provides a battery pack and a vehicle, wherein a first cooling plate is arranged on a confluence assembly, the first cooling plate is provided with an avoidance part for avoiding an explosion-proof valve of a battery cell, and the first cooling plate cools the confluence assembly and a pole, so that the problem of higher temperature of the confluence assembly and the pole of the battery cell can be avoided, and the vehicle can be charged under higher charging rate and can work under high dynamic property.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

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

fig. 2 is a schematic diagram of a partial explosion of the battery pack of fig. 1;

fig. 3 is a schematic structural diagram of the battery cell in fig. 2;

FIG. 4 is an enlarged schematic view at A in FIG. 2;

FIG. 5 is a schematic structural view of the skeletal body of FIG. 4;

FIG. 6 is a partial schematic view of FIG. 2;

FIG. 7 is a schematic view of the structure of the cooling part of FIG. 6;

fig. 8 is a schematic diagram illustrating a partial explosion of a second battery pack according to an embodiment of the present invention;

FIG. 9 is a partial schematic view of FIG. 8;

fig. 10 is a schematic diagram illustrating a partial explosion of a third battery pack according to an embodiment of the present invention;

fig. 11 is a schematic structural view of the first cooling plate in fig. 10.

Description of reference numerals:

10-an electric core group; 11-electric core;

111-explosion-proof valve; 112-pole;

20-a bus assembly; 21-a scaffold body;

211-a through hole; 22-a confluence piece;

30-a first cooling plate; 301-an avoidance portion;

31-a cooling section; 311-a first end;

312-a second end; 313-a cooling channel;

321-a first integrated tube; 3211-first part;

3212-second part; 322-a second integrated tube;

331-a first joint; 332-a second linker;

34-fire-resistant belt; 35-second cooling plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It should be noted that the terms "first" and "second" 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," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. 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 "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description above, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., are intended to 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.

In the related art, the battery pack comprises a plurality of battery cells, liquid cooling plates are arranged at the bottoms of the battery cells, and the liquid cooling plates can be arranged at the bottoms of the battery cells, among the large surfaces of the battery cells, and among the side surfaces of the battery cells, so that the battery pack can be cooled and radiated; the top of a plurality of electric cores sets up the assembly that converges, and the assembly that converges is connected with the utmost point post welded connection of a plurality of electric cores to be convenient for derive the inside electric current of a plurality of electric cores. However, when the battery pack is charged at a higher charging rate, the temperatures of the bus assembly and the terminal post are sharply increased, and the bus assembly and the terminal post cannot be effectively cooled and radiated only by the currently arranged liquid cooling plate, so that the problem that the temperatures of the terminal posts of the bus assembly and the battery cell are higher can be caused.

In order to solve the problems, the invention provides a battery pack and a vehicle, wherein a first cooling plate is arranged on a confluence assembly, the first cooling plate is provided with an avoiding part for avoiding an explosion-proof valve of a battery cell, and the first cooling plate cools the confluence assembly and a pole, so that the problem that the temperatures of the confluence assembly and the pole of the battery cell are high can be avoided, and the vehicle can be charged at a high charging rate and can work at a high dynamic property.

The following describes the battery pack and the vehicle in detail with reference to specific embodiments.

Fig. 1 is a schematic structural diagram of a first battery pack according to an embodiment of the present invention; fig. 2 is a schematic diagram of a partial explosion of the battery pack of fig. 1; fig. 3 is a schematic structural diagram of the battery cell in fig. 2; FIG. 4 is an enlarged schematic view at A in FIG. 2; FIG. 5 is a schematic view of the skeleton body of FIG. 4; FIG. 6 is a partial schematic view of FIG. 2; fig. 7 is a schematic view of the structure of the cooling part in fig. 6. Note that the upper cover 40 and the bottom plate 50 are not shown in fig. 2.

As shown in fig. 1, 2 and 3, the embodiment of the present invention provides a battery pack including a battery core pack 10, a bus bar assembly 20 and a first cooling plate 30. The battery pack further includes an upper cover 40 and a bottom plate 50, and the electric core pack 10, the bus bar assembly 20, and the first cooling plate 30 are integrated between the upper cover 40 and the bottom plate 50.

The battery pack 10 includes a plurality of battery cells 11, the plurality of battery cells 11 are sequentially disposed along a first direction, the battery cells 11 include an explosion-proof valve 111 and two terminal posts 112, and the explosion-proof valve 111 and the two terminal posts 112 are located at the top of the battery cells 11. Two parallel bus assemblies 20 are arranged on the cell group 10, and the bus assemblies 20 are connected with the poles 112 of the adjacent cells 11 in a welding manner.

As shown in fig. 2 and 6, the first cooling plate 30 is provided on the junction assembly 20, the first cooling plate 30 has an escape portion 301 that escapes the explosion-proof valve 111 of the battery cell 11, and the first cooling plate 30 is used to cool the junction assembly 20 and the pole 112.

Wherein, the shape of battery package can be rectangle. The first direction may be a length direction of the battery pack.

The number of the electric cells 11 in the electric cell group 10 can be set according to actual needs. One end of the cell 11 having the explosion-proof valve 111 and the two poles 112 is the top of the cell 11.

The explosion-proof valve 111 is located between two poles 112 of the cell 11. The explosion-proof valve 111 may cut off the current loop when the internal pressure in the cell 11 is high. The explosion-proof valve 111 may also be broken by the explosion-proof valve 111 when the internal pressure in the cell 11 is high, so as to release the pressure inside the cell 11.

The two current collecting assemblies 20 of the electric core group 10 are arranged in parallel, the two current collecting assemblies 20 extend along a first direction, and the current collecting assemblies 20 are used for guiding out the current inside the electric core group 10.

As shown in fig. 4 and 5, the bus bar assembly 20 includes a frame main body 21 and a bus bar 22, the frame main body 21 is provided with a through hole 211 through which the pole 112 penetrates, and the bus bar 22 is connected to the pole 112 of the adjacent battery cell 11 by welding.

The material of the frame body 21 may be high-strength plastic. In other embodiments, the material of the skeleton body 21 may be other materials having high strength.

The skeleton body 21 has a space for accommodating the bus bar 22. The framework main body 21 and the battery cell 11 can be fixedly connected through structural adhesive. The framework main body 21 and the upper cover 40 can be fixedly connected through structural adhesive or hot riveting.

The bus bar 22 may be made of aluminum or copper. Before and after the bus bar 22 is welded to the pole 112 of the cell 11, an insulation treatment is required.

The first cooling plate 30 has an escape portion 301 that escapes the explosion-proof valve 111 of the cell 11, so that it is possible to ensure that the use of the explosion-proof valve 111 is not affected. The avoiding part 301 can be a hollow structure or a thin plate which is easy to burn through after being thinned.

It should be noted that the first cooling plate 30 can reduce the weight of the first cooling plate 30 by the relief portion 301, so that the weight of the battery pack can be reduced, and the cost of the battery pack can be reduced.

The shape of the first cooling plate 30 is not specifically set here. The first cooling plate 30 is disposed between the upper cover 40 and the manifold assembly 20, and the manifold assembly 20 can support the first cooling plate 30.

The first cooling plate 30 is located in a space surrounded by the skeleton body 21 and the upper cover 40. The first cooling plate 30 can cool the bus assembly 20 and the pole 112 through a liquid cooling medium, can cool the bus assembly 20 and the pole 112 through cold air, and can cool the bus assembly 20 and the pole 112 through a phase-change material.

It should be noted that the first cooling plate 30 may cool not only the junction assembly 20 and the electrode post 112, but also the inside of the battery cell 11, for example, a connecting sheet inside the battery cell 11.

The upper cover 40 is an upper cover commonly used in the field of battery packs, and the specific structure is not specifically provided here.

The base plate 50 is a base plate commonly used in the battery pack field, and a specific structure is not specifically provided herein.

According to the battery pack provided by the embodiment of the invention, the first cooling plate 30 is used for cooling the confluence assembly 20 and the pole 112, so that the problem that the temperatures of the confluence assembly 20 and the pole 112 of the battery cell 11 are high can be avoided, and a vehicle can be charged at a high charging rate and can work at a high dynamic property.

Alternatively, as shown in fig. 1 and 2, the battery pack includes a plurality of sets of electric core groups 10, and the plurality of sets of electric core groups 10 are sequentially arranged along the second direction. The first direction is perpendicular to the second direction.

Wherein the second direction may be a width direction of the battery pack. In the second direction, the number of the electric core groups 10 can be set according to actual needs.

Two parallel bus assemblies 20 are disposed on each group of electric core sets 10, and the bus assemblies 20 extend along a first direction.

The first cooling plate 30 may be composed of a plurality of cooling portions 31, or may be a single plate, and is not specifically provided here.

When the first cooling plate 30 is composed of a plurality of cooling portions 31, each cooling portion 31 corresponds to one row of the bus bar assembly 20, each cooling portion 31 extends along the first direction, the plurality of cooling portions 31 are arranged at intervals in the second direction, and the relief portions 301 are spaces between adjacent cooling portions 31.

When the first cooling plate 30 is a single plate, the region of the first cooling plate 30 corresponding to the bus bar assembly 20 is a cooling region for cooling the bus bar assembly 20 and the electrode post 112, and the region of the first cooling plate 30 corresponding to the explosion-proof valve 111 is a thin plate which is easily burned through after being thinned, and the thin plate is the escape portion 301.

Alternatively, as shown in fig. 6 and 7, the first cooling plate 30 includes a plurality of cooling portions 31, the plurality of cooling portions 31 are arranged at intervals in the second direction, each cooling portion 31 extends along the first direction, the cooling portion 31 is a harmonica tube type cooling portion, the cooling portion 31 has a first end 311 and a second end 312, the first end 311 and the second end 312 are arranged opposite to each other in the first direction, a plurality of cooling channels 313 are arranged on the cooling portion 31, and the plurality of cooling channels 313 are arranged at intervals in the second direction.

The shape of the cooling portion 31 may be a rectangular parallelepiped. The adjacent cooling portions 31 may or may not be in communication with each other.

The shape of the cooling channel 313 may be square. In other forms, the shape of the cooling channel 313 may be other shapes.

There is no communication between adjacent cooling passages 313 on each cooling portion 31. The cooling channel 313 may be filled with a liquid cooling medium.

The cooling channel 313 may be either open or closed at both ends, and is not specifically provided here.

When the cooling channel 313 is not closed, the liquid cooling medium outside the battery pack flows into the cooling channel 313, and the liquid cooling medium in the cooling channel 313 can flow out to the liquid cooling medium outside the battery pack, so that the liquid cooling medium in the cooling channel 313 can be exchanged with the liquid cooling medium outside the battery pack.

When the cooling passage 313 is closed, the liquid cooling medium in the cooling passage 313 may be a liquid cooling medium having a large heat capacity, and the liquid cooling medium in the cooling passage 313 may not exchange with the liquid cooling medium outside the battery pack, and the heat of the bus bar assembly 20 and the pole post 112 may be absorbed for a short time by utilizing the characteristic of the large heat capacity of the liquid cooling medium, so that the temperature of the bus bar assembly 20 and the pole post 112 may be suppressed from being excessively high.

Further, as shown in fig. 6 and 7, the cooling part 31 may be a flexible insulating cooling plate. So set up, can prevent to appear the short circuit between first cold plate 30 and the electric core group 10 to can improve the security of battery package.

The flexible insulating cooling plate is mainly made of non-metal materials.

Specifically, the flexible insulating cooling plate can be formed by adding the insulating protective material into the non-metallic material and integrally injecting.

After the non-metal material is adopted for injection molding, the insulating protective material is added outside the molded product to form the flexible insulating cooling plate.

The method is characterized in that an insulating protective material is added into a non-metal material to form a flat plate and a plate with a flow channel in an integrated injection molding mode, and then the flat plate and the plate with the flow channel can form the flexible insulating cooling plate by adopting a non-metal welding process.

In an alternative embodiment, the cooling portion 31 is a flexible insulating cooling plate, the cooling portion 31 is supported by the skeleton body 21 of the bus bar assembly 20, so that the stress on the bus bar 22 can be reduced, and the cooling portion 31 is tightly attached to the bus bar assembly 20 by utilizing the flexibility of itself, so that the bus bar assembly 20 and the pole 112 can be cooled. In the present embodiment, the cooling portion 31 and the bus bar assembly 20 are closely attached to each other.

In another alternative embodiment, the cooling portion 31 is a flexible insulating cooling plate, the cooling portion 31 is supported by the skeleton main body 21 of the bus assembly 20, which can reduce the stress on the bus bar 22, the cooling portion 31 is tightly attached to the bus assembly 20 by using its own soft characteristic, a gap between the cooling portion 31 and the bus assembly 20 is provided with a heat-conducting structural adhesive, and the cooling portion 31 can cool the bus assembly 20 and the pole 112 through the heat-conducting structural adhesive. In the present embodiment, a gap is provided between the cooling portion 31 and the bus bar assembly 20.

Further, a plurality of curved sections 314 are provided on the cooling portion 31, and the plurality of curved sections 314 are provided at intervals in the second direction. With this arrangement, the stability of the cooling portion 31 in the bus bar assembly 20 can be enhanced by the plurality of curved sections 314.

In particular, the shape of the curved section 314 remains unchanged. By increasing the strength of the cooling portion 31 at the curved section 314, the shape of the curved section 314 can be kept constant. In some examples, increasing the strength at the curved section 314 may be such that the shape of the curved section 314 remains unchanged by increasing the thickness of the cooling portion 31 at the curved section 314.

Fig. 8 is a schematic diagram illustrating a partial explosion of a second battery pack according to an embodiment of the present invention; fig. 9 is a partial schematic view of fig. 8. In the battery pack of fig. 8, the material of the first cooling plate 30 is different from that of the battery pack of fig. 1, and the other portions are the same.

Alternatively, the cooling portion 31 may be a rigid insulating cooling plate.

Wherein, the rigid insulating cooling plate is made of metal material.

Specifically, the rigid insulating cooling plate can be formed by injection molding a metal material and then performing surface insulation protection treatment after the molding.

The method comprises the steps of forming two flat plates by injection molding of a metal material, stamping one of the flat plates to form a plate with a flow channel, welding the un-stamped flat plate and the plate with the flow channel by a brazing process, and carrying out insulation protection treatment on the surfaces of the un-stamped flat plate and the plate with the flow channel to form the rigid insulation cooling plate.

In other implementations, the rigid insulating cooling plate may also be formed by a blow-up process.

In an alternative embodiment, the cooling portion 31 is a rigid insulating cooling plate, the cooling portion 31 is supported by the skeleton main body 21 of the bus bar assembly 20, so that the stress on the bus bar 22 can be reduced, a heat conducting structural adhesive is disposed in a gap between the cooling portion 31 and the bus bar assembly 20, and the cooling portion 31 can cool the bus bar assembly 20 and the pole 112 through the heat conducting structural adhesive, so that the cooling portion 31 can effectively cool the bus bar assembly 20 and the pole 112.

A heat conduction pad may be provided in a gap between the cooling portion 31 and the bus bar assembly 20, and the cooling portion 31 may cool the bus bar assembly 20 and the pole 112 through the heat conduction pad.

Optionally, as shown in fig. 2 and 6, the battery pack further includes a first integrated pipe 321 and a second integrated pipe 322, the first integrated pipe 321 communicating with the first ends 311 of the plurality of cooling parts 31, and the second integrated pipe 322 communicating with the second ends 312 of the plurality of cooling parts 31.

The first integrated pipe 321 may be a plastic hard pipe or a metal hard pipe, and is not specifically configured here. When the material of the first manifold 321 is the same as the material of the cooling portion 31, the first manifold and the cooling portion may be connected by welding. When the material of the first manifold 321 is different from the material of the cooling unit 31, the first manifold 321 and the cooling unit 31 may be connected by a joint.

The second integrated pipe 322 may be a plastic hard pipe or a metal hard pipe, and is not specifically configured here. When the material of the second manifold 322 is the same as that of the cooling portion 31, it may be connected by welding. When the material of the second integrated pipe 322 is different from that of the cooling part 31, the second integrated pipe 322 and the cooling part 31 may be connected by a joint.

When the liquid cooling medium is provided in the cooling passage 313, the liquid cooling medium in the cooling passage 313 may flow into the first and second

integrated tubes

321 and 322, and the liquid cooling medium in the first and second

integrated tubes

321 and 322 may flow into the cooling passage 313.

The liquid cooling medium in the cooling channel 313 may not be exchanged with the liquid cooling medium outside the battery pack. In other implementations, the liquid cooling medium in the cooling channels 313 may also be exchanged with a liquid cooling medium outside the battery pack.

In an alternative embodiment, when the first integrated pipe 321 and the second integrated pipe 322 are respectively communicated with the liquid cooling medium outside the battery pack, the liquid cooling medium outside the battery pack flows into the cooling channel 313 through the first integrated pipe 321, and the liquid medium in the cooling channel 313 can flow out to the liquid cooling medium outside the battery pack through the second integrated pipe 322, so that the liquid cooling medium in the cooling channel 313 can be exchanged with the liquid cooling medium outside the battery pack.

In another alternative embodiment, when the first integrated pipe 321 and the second integrated pipe 322 are not communicated with the liquid cooling medium outside the battery pack, the liquid cooling medium in the cooling channel 313 may be a liquid cooling medium with a large heat fusion, the liquid cooling medium in the cooling channel 313 is not exchanged with the liquid cooling medium outside the battery pack, and the heat of the bus bar assembly 20 and the pole 112 may be absorbed in a short time by using the characteristic of a large heat capacity of the liquid cooling medium, so that the temperature of the bus bar assembly 20 and the pole 112 may be suppressed from being too high.

Further, as shown in fig. 2 and 6, the battery pack further includes a first joint 331 and a second joint 332, the first integrated pipe 321 includes a first portion 3211 and a second portion 3212 which are not communicated with each other, the first joint 331 is disposed on the first portion 3211, the first joint 331 is communicated with the first portion 3211, the second joint 332 is disposed on the second portion 3212, the second joint 332 is communicated with the second portion 3212, the first joint 331 is used for the inflow of the liquid cooling medium, and the second joint 332 is used for the outflow of the liquid cooling medium.

Wherein the first ends 311 of all the cooling parts 31 connected to the first part 3211 communicate with each other through the first part 3211. The first ends 311 of all the cooling parts 31 connected to the second section 3212 communicate through the second section 3212. The second ends 312 of all the cooling parts 31 connected to the second integrated pipes 322 communicate with each other through the second integrated pipes 322.

The first joint 331 may be a plastic joint or a metal joint, and is not specifically configured here. The material of the first joint 331 and the material of the first manifold 321 may be the same. The first joint 331 and the first integration pipe 321 may be connected together by welding.

The second joint 332 may be a plastic joint or a metal joint, and is not specifically configured here. The second connector 332 may be made of the same material as the first manifold 321. The second joint 332 and the first integration pipe 321 may be connected together by welding.

The first joint 331 and the second joint 332 are respectively communicated with a liquid cooling medium outside the battery pack, the liquid cooling medium outside the battery pack flows into the cooling channel 313 through the first joint 331 and the first part 3211, and the liquid medium in the cooling channel 313 can flow out into the liquid cooling medium outside the battery pack through the second joint 332 and the second part 3212, so that the liquid cooling medium in the cooling channel 313 can be exchanged with the liquid cooling medium outside the battery pack.

Fig. 10 is a schematic diagram illustrating a partial explosion of a third battery pack according to an embodiment of the present invention; fig. 11 is a schematic structural view of the first cooling plate in fig. 10. In the battery pack of fig. 10, the material of the first cooling plate 30 is different from that of the battery pack of fig. 1, and the first cooling plate 30 in this embodiment has no cooling channel, and has no first tab, second tab, first manifold and second manifold, and the other parts are the same.

Alternatively, as shown in fig. 10 and 11, the first cooling plate 30 includes a plurality of cooling portions 31, the plurality of cooling portions 31 are arranged at intervals in the second direction, each cooling portion 31 extends along the first direction, and the cooling portions 31 are phase change material cooling plates.

The phase-change material cooling plate is made of a material capable of changing solid phase into liquid phase and absorbing heat. The cooling portion 31 absorbs heat through solid-liquid phase change, and can cool the junction assembly 20 and the pole 112.

The outer surface of the cooling part 31 is provided with a fixing film for preventing the cooling part 31 from phase-changing into a liquid state and then flowing into the electric core pack 10.

In an alternative embodiment, the cooling portion 31 is a phase-change material cooling plate, the cooling portion 31 is supported by the skeleton main body 21 of the bus bar assembly 20, and can reduce the stress on the bus bar 22, and the cooling portion 31 absorbs heat through solid-liquid phase change, and can cool the bus bar assembly 20 and the pole 112.

Optionally, as shown in fig. 2, the battery pack further includes a fire-retardant band 34, and the fire-retardant band 34 is disposed on the first cooling plate 30, and the fire-retardant band 34 is used to prevent the insulating property of the first cooling plate 30 from being lowered. With the arrangement, when thermal runaway of the battery pack occurs, the fire-proof belt 34 can prevent high-temperature splashes generated after the valve is sprayed on the battery cell 11 from causing ablation of the first cooling plate 30, so that reduction of the insulation performance of the first cooling plate 30 can be prevented.

Where fire-protecting strip 34 is located between upper cover 40 and first cooling plate 30, fire-protecting strip 34 may be made of a fire-retardant material.

Specifically, the first cooling plate 30 includes a plurality of cooling portions 31, the plurality of cooling portions 31 are arranged at intervals in the second direction, each cooling portion 31 extends along the first direction, each cooling portion 31 corresponds to one fire guard 34, and a space is provided between adjacent fire guards 34, the space corresponding to the escape portion 301 of the first cooling plate 30.

Optionally, as shown in fig. 1, the battery further includes a second cooling plate 35, and the second cooling plate 35 is used for cooling the electric core pack 10.

The position of the second cooling plate 35 is not specifically set here. In some examples, the second cooling plate 35 may be disposed at the bottom of the battery core group 10, or between the large faces of the battery cells 11. Meanwhile, the electric core group 10 and the bus bar assembly 20 are cooled by the first cooling plate 30 and the second cooling plate 35, so that the vehicle can be charged at a higher charging rate and can work under high dynamic.

The second cooling plate 35 may be made of metal.

The cooling method used by the second cooling plate 35 is not specifically set. In some examples, the second cooling plate 35 may cool the electric core assembly 10 by liquid cooling or air cooling.

In a continuous embodiment, the second cooling plate 35 can be disposed at the bottom of the electric core assembly 10, and the second cooling plate 35 is located between the electric core assembly 10 and the bottom plate 50. The second cooling plate 35 and the electric core assembly 10 can be fixedly connected through structural adhesive. The second cooling plate 35 and the bottom plate 50 may be fixedly connected by structural adhesive or by hot riveting.

An embodiment of the invention provides a vehicle, which comprises a chassis and a battery pack. The battery pack is mounted on the chassis.

The battery pack in this embodiment has the same structure as the battery pack provided in any of the embodiments described above, and can have the same or similar technical effects, and details are not repeated here, and specific reference may be made to the description of the embodiments described above.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack is characterized by comprising a battery core group, a bus assembly and a first cooling plate;

2. The battery pack according to claim 1, wherein the plurality of the battery cell groups are sequentially arranged along a second direction, and the first direction is perpendicular to the second direction.

3. The battery pack according to claim 2, wherein the first cooling plate includes a plurality of cooling portions that are arranged at intervals in the second direction in sequence, each of the cooling portions corresponding to one of the rows of the bus bar assemblies;

the avoiding part is a space between the adjacent cooling parts.

4. The battery pack according to claim 3, wherein the cooling portion is a harmonica-shaped cooling portion having a first end and a second end, the first end and the second end being disposed opposite to each other in the first direction, the cooling portion having a plurality of cooling channels disposed thereon, the plurality of cooling channels being disposed at intervals in the second direction;

5. The battery pack according to claim 4, further comprising a first joint and a second joint, the first manifold including a first portion and a second portion that are not in communication, the first joint being provided on the first portion, the first joint being in communication with the first portion, the second joint being provided on the second portion, the second joint being in communication with the second portion, the first joint being for inflow of a liquid cooling medium, the second joint being for outflow of the liquid cooling medium.

6. The battery pack according to claim 5, wherein the cooling portion is a flexible insulating cooling plate or a rigid insulating cooling plate.

7. The battery pack according to claim 3, wherein the cooling portion is a phase change material cooling plate.

8. The battery pack of any of claims 1-6, wherein a thermally conductive structural adhesive or a thermally conductive pad is disposed between the first cooling plate and the bus assembly.

9. The battery pack according to any one of claims 1 to 7, further comprising a fire-resistant tape provided on the first cooling plate, the fire-resistant tape being configured to prevent a decrease in insulating properties of the first cooling plate.

10. A vehicle comprising a chassis and a battery pack as claimed in any one of claims 1 to 9;

the battery pack is mounted on the chassis.