CN219017758U

CN219017758U - Battery monomer, battery and power consumption device

Info

Publication number: CN219017758U
Application number: CN202223133686.0U
Authority: CN
Inventors: 阎晓洁; 卓为荣; 李翔; 刘智
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2023-05-12
Anticipated expiration: 2032-11-24

Abstract

The application discloses a battery monomer, a battery and an electricity utilization device. The battery cell of this application includes: a housing; the inner tube is arranged in the shell, one end of the inner tube is connected with the shell, the cavity of the inner tube penetrates through one end of the inner tube and is communicated with the outside of the shell, the other end of the inner tube is a free end, a tube orifice of the free end is provided with a blocking structure for blocking the tube orifice, the shell and the inner tube jointly define a containing cavity, and the electrode assembly is arranged in the containing cavity. The one end and the casing of the inner tube of this application are connected, and the other end of inner tube is the free end, and the mouth of pipe of the other end of inner tube is equipped with the orificial shutoff structure of shutoff, compares with the structure that the both ends of inner tube all are connected with the casing, and the inner tube need not to consider the length tolerance of inner tube with being connected of casing, avoids the inner tube to be connected with the casing and exceeds the tolerance easily and influence the quality problem of battery.

Description

Battery monomer, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and an electricity utilization device.

Background

At present, in order to improve the heat dissipation effect inside the battery, the middle of the battery is provided with a hollow structure penetrating through the upper end and the lower end, the length tolerance of the hollow structure is not easy to control when the hollow structure is connected with the shell of the battery, the range allowed by the length tolerance is easily exceeded, the manufacturing difficulty is increased, and the quality of the battery is influenced.

Disclosure of Invention

In view of the above, the present application provides a battery cell, a battery, and an electric device, which can avoid the problem that the length tolerance of the hollow structure exceeds the allowable range when the hollow structure is connected with the housing of the battery.

In a first aspect, the present application provides a battery cell comprising:

a housing;

the inner tube is arranged in the shell, one end of the inner tube is connected with the shell, a cavity of the inner tube penetrates through one end of the inner tube and is communicated with the outside of the shell, the other end of the inner tube is a free end, and a tube orifice of the free end is provided with a blocking structure for blocking the tube orifice;

the shell and the inner tube jointly define a containing cavity, and the electrode assembly is arranged in the containing cavity.

Compared with the structure that both ends of inner tube all are connected with the casing, among the technical scheme of this application embodiment, the inner tube sets up in the casing, and the one end and the casing of inner tube are connected, and the other end of inner tube is the free end, and the length size of inner tube does not influence the connection of inner tube and casing, and the mouth of pipe of free end is equipped with the shutoff structure, can ensure that electrolyte in the casing does not reveal outside from the free end of inner tube. Therefore, the connection between the two ends of the inner tube and the shell can be avoided, the two ends of the inner tube penetrate through the shell, and when the length tolerance of the inner tube is not in the allowable range, the connection is unreliable due to the overlarge gap between one of the two ends of the inner tube and the shell, so that the electrolyte in the shell is easy to leak to the outside.

In some embodiments, the housing comprises:

a housing body provided with an opening;

the top cover assembly is covered on the opening and is connected with the shell body;

one end of the inner tube is connected with the shell body or the top cover component.

One end through the inner tube can be connected with the casing body or the top cap subassembly of casing, can rationally select the inner tube to be connected with casing body or top cap subassembly according to the user demand.

In some embodiments, the battery cell includes a first insulating layer provided at least a portion of an inner surface of the receiving cavity, the first insulating layer being for insulating the electrode assembly from the case and insulating the electrode assembly from the inner tube.

Therefore, the insulation between the inner tube and the shell and the electrode assembly of the battery cell can be realized, and the insulation is applied to the battery cell with two polar posts, so that the problem that potential safety hazards occur when the shell is electrified is avoided.

In some embodiments, the electrode assembly has a first tab and a second tab, the electrode assembly is disposed around the inner tube, the top cap assembly further includes a top cap, a first post and a second post, the top cap covers the opening, the second post is electrically connected to the second tab, and the first post is electrically connected to the first tab.

Therefore, the shell body can be used in a battery monomer without serving as an anode or a cathode, the battery monomer is provided with a first pole column and a second pole column, the first pole column and the second pole column are independently used as the anode and the cathode of the battery monomer, and good insulation effects are achieved between the shell body and the electrode assembly and between the inner tube and the electrode assembly through the arrangement of the insulation layer, so that the problem of electric leakage is avoided.

In some embodiments, the battery cell further comprises a second insulating layer, the housing has an outer surface facing away from the receiving cavity, the inner tube has an inner surface facing away from the receiving cavity, and a portion of the outer surface of the housing and/or the inner surface of the inner tube is provided with the second insulating layer.

The second insulating layer is arranged on the part of the outer surface of the shell and the inner surface of the inner tube, so that the part of the outer surface of the shell, which is not provided with the second insulating layer, can be used as the positive electrode or the negative electrode of the battery cell, and the structure of the battery cell is simpler and more compact.

In some embodiments, the electrode assembly has a first tab and a second tab, the first tab is electrically connected to the housing, the top cap assembly further includes a top cap and a post, the top cap is provided over the opening, and the post is insulated from the top cap and is electrically connected to the second tab.

Thus, the electrode post is electrically connected to the second electrode tab, and can be used as the positive electrode or the negative electrode of the battery, that is, the first electrode post can be used as the positive electrode of the battery cell, and the housing can be used as the negative electrode of the battery cell. The first electrode post may be used as a negative electrode of a battery cell, and the case may be used as a positive electrode of the battery. Only one pole is arranged in the battery cell, so that the structure of the battery cell can be simplified.

In some embodiments, the battery cell further includes a third insulating layer, the cap assembly includes a cap, and the third insulating layer is disposed between the cap and the electrode assembly.

Therefore, the top cover can be insulated, electric leakage of the top cover is avoided, and safety of the battery monomer in the use process is ensured.

In some embodiments, the receiving cavity is an annular receiving space.

Therefore, the electrode assembly can be wound on the inner tube or inserted on the inner tube, and the electrode assembly is arranged in the annular accommodating space, so that the annular accommodating space can be fully utilized.

In some embodiments, the inner tube is a straight tube, and the length direction of the inner tube is the same as the orientation of the opening.

Therefore, the electrode assembly can be wound on the inner tube, the inner tube is connected with the shell, the inner tube can be connected with the shell, and then the electrode assembly is arranged in the shell from the free end of the inner tube, so that the assembly difficulty of the electrode assembly can be reduced.

In some embodiments, the housing is a square housing structure or a circular housing structure; and/or the inner tube is a round tube or a square tube.

Therefore, the shell is of a square shell structure, and/or the inner tube is a round tube or a square tube, so that the shell can be used in square battery cells; the shell is of a circular shell structure, and/or the inner tube is a round tube or a square tube, so that the shell can be used in a circular battery cell.

In some embodiments, the housing is integrally formed with the inner tube; and/or the shell, the inner tube and the plugging structure are integrally formed.

Thereby, the connection of the housing and the inner tube can be made more reliable.

In some embodiments, the electrode assembly is a coiled structure disposed around the inner tube; or the electrode assembly is a lamination-like structure.

The coiled electrode assembly is adopted, so that the installation of the electrode assembly can be facilitated, namely the electrode assembly can be arranged on the inner tube in a penetrating way after being coiled, and the inner tube can be connected with the shell after being coiled, so that the electrode assembly is convenient to assemble. And the lamination-shaped structure is adopted, so that the charge and discharge power is better, and the space utilization rate of the lamination is higher.

In a second aspect, the present application provides a battery comprising the battery cell of the first aspect.

Since the battery includes all technical features of the battery cell of the first aspect, the effects are the same as those described above, and a detailed description thereof is omitted.

In some embodiments, the battery further comprises a heat exchange device thermally coupled to the battery cell.

The heat exchange device and the battery monomer can exchange heat, which is beneficial to heat dissipation of the battery.

In some embodiments, the heat exchange device comprises:

and the heat exchange bottom plate is positioned at the bottom of the battery unit and is thermally coupled with the battery unit, and a heat exchange flow channel is arranged in the heat exchange bottom plate and is configured to flow in and flow out of a heat exchange medium.

And a heat exchange medium is introduced into the heat exchange flow channel, so that the heat exchange effect of the battery monomer is improved. The heat exchange runner can exchange heat with the battery module or the battery monomer of the battery pack.

In some embodiments, the battery further comprises a plurality of side plates, the edges of the plurality of heat exchange bottom plates are connected with the side plates, and the plurality of side plates and the heat exchange bottom plates jointly define a box body with an accommodating space, and the battery unit is located in the accommodating space.

The box body with the accommodation space is jointly limited by the side plates and the heat exchange bottom plate, the box body can be used as the box body of the battery pack, therefore, heat exchange between the heat exchange bottom plate and the battery cells in the battery pack can be realized, the heat exchange bottom plate serves as a part of the box body, and compared with the bottom of the box body of the battery pack, the volume of the battery pack can be reduced, and the heat exchange effect can be improved.

In some embodiments, the heat exchange device further comprises a first heat conducting member, the first heat conducting member is connected with the heat exchange bottom plate, and at least part of the surface of the first heat conducting member is arranged in a manner of being abutted against the outer surface of the battery cell.

The arrangement of the first heat conducting piece can accelerate the heat transmission speed between the battery monomer and the heat exchange flow channel, and improves the external heat dissipation effect of the battery monomer.

In some embodiments, the heat exchange device further comprises a second heat conducting member connected to the heat exchange bottom plate, and the second heat conducting member is located inside the inner tube.

The second heat conducting piece can accelerate the heat exchange speed between the center of the electrode assembly and the heat exchange bottom plate, and further improves the heat dissipation effect of the battery.

In some embodiments, the second heat conducting member is clamped or welded to the heat exchange bottom plate.

Therefore, the connection between the second heat conduction piece and the heat exchange bottom plate can be facilitated.

In some embodiments, at least a portion of the outer surface of the second thermally conductive member is connected to the inner surface of the cavity of the inner tube by a thermally conductive adhesive.

The second heat conducting piece is connected with the inner tube through the heat conducting glue, so that on one hand, the connection strength of the inner tube and the second heat conducting piece can be increased, and on the other hand, the heat conducting property of the heat conducting glue is beneficial to heat conduction, and the heat transfer speed of the electrode assembly and the heat exchange bottom plate can be improved.

In some embodiments, the second heat transfer member is a heat exchange tube, the heat exchange tube has a first heat exchange port and a second heat exchange port, the heat exchange flow channel has a first heat exchange flow channel port and a second heat exchange flow channel port, the first heat exchange flow channel port is connected with the first heat exchange port, and the second heat exchange flow channel port is connected with the second heat exchange port.

Therefore, the heat exchange medium in the heat exchange flow channel can enter the heat exchange tube and flow back to the heat exchange flow channel through the heat exchange tube to form circulating heat exchange, so that the heat exchange effect of the heat exchange channel and the heat exchange bottom plate can be quickened.

In some embodiments, the pipe orifice of the heat exchange pipe is arranged towards one side of the heat exchange bottom plate, a partition plate extending along the length direction of the heat exchange pipe is arranged in the pipe cavity of the heat exchange pipe, the partition plate divides the pipe cavity into a first flow passage and a second flow passage communicated with the first flow passage, and the first flow passage and the second flow passage form a first heat exchange port and a second heat exchange port in one-to-one correspondence with the pipe orifice of the heat exchange pipe.

The length of the flow channel in the heat exchange tube can be increased by arranging the partition plates, so that the heat exchange efficiency is improved.

In some embodiments, the heat exchange tube is a straight tube.

The manufacture of the heat exchange tube is convenient, and the structure is simpler.

In some embodiments, the heat exchange tube is a spiral tube or a U-tube.

Therefore, the length of the flow channel in the heat exchange tube can be increased, and the heat exchange efficiency is improved.

In a third aspect, the present application provides an electrical device comprising the battery cell of the first aspect, the battery cell being configured to provide electrical energy; or a battery of the second aspect, the battery being for providing electrical energy.

Since the power utilization device includes the technical features of the second aspect to the fifth aspect, the effects are the same as those described above, and the description thereof will not be repeated.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

fig. 1 is a schematic structural diagram of an electric device according to some embodiments of the present application;

fig. 2 is an exploded view of a battery pack according to some embodiments of the present application;

fig. 3 is a schematic structural view of a battery cell according to some embodiments of the present application;

FIG. 4 is an isometric view of a housing body coupled to an inner tube according to some embodiments of the present application;

FIG. 5 is a cross-sectional view of a first view of a housing body coupled to an inner tube according to some embodiments of the present application;

FIG. 6 is a cross-sectional view of a first view of a housing body coupled to an inner tube according to some embodiments of the present application;

fig. 7 is a cross-sectional view of a first view of a battery cell according to some embodiments of the present application;

FIG. 8 is a top view of a battery cell according to some embodiments of the present application;

fig. 9 is an isometric view of a housing of a battery cell according to some embodiments of the present application;

fig. 10 is a cross-sectional view of a first view of a battery cell according to some embodiments of the present application;

FIG. 11 is an enlarged view of a portion of FIG. 10 at I;

fig. 12 is a cross-sectional view of a second view of a battery cell according to some embodiments of the present application;

FIG. 13 is an isometric view of a battery according to some embodiments of the present application;

FIG. 14 is an isometric view of a heat exchange device according to some embodiments of the present application;

FIG. 15 is an isometric view of a heat exchange device according to some embodiments of the present application;

FIG. 16 is a cross-sectional view of a single cell of a heat exchange device in accordance with some embodiments of the present application coupled to a heat exchange base plate;

FIG. 17 is an enlarged view of a portion of FIG. 16 at II;

FIG. 18 is an isometric view of a heat exchange device according to some embodiments of the present application;

FIG. 19 is a cross-sectional view of a single cell of a heat exchange device in accordance with some embodiments of the present application coupled to a heat exchange base plate;

FIG. 20 is an isometric view of a heat exchange device according to some embodiments of the present application;

fig. 21 is a cross-sectional view of a heat exchange device single cell and heat exchange base plate connection according to some embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

a vehicle 1000;

a battery pack 100;

the battery pack comprises a battery pack body 10, a battery pack box 11, a heat exchange bottom plate 111, a heat exchange flow channel 111a, side plates 112 and an upper cover 12;

the battery cell 20, the case 21, the cap assembly 211, the cap 211a, the first post 211b, the second post 211c, the post 211d, the case body 212, the bottom 212a of the case body, the inner tube 22, the blocking structure 22a, the electrode assembly 23, the first switching tab 24, the second switching tab 25, the first insulating layer 26, the second insulating layer 27, the third insulating layer 28; a first heat-conducting member 29, a second heat-conducting member 30, a partition plate 31, a U-shaped pipe 303, a spiral pipe 304;

a heat exchanging device 400;

a controller 200;

a motor 300.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

The applicant notes that the housing of the battery cell is connected to both ends of the inner tube, which is a hollow tube, which can act to transfer heat to the housing. When both ends of the inner tube are connected with the top and bottom of the case, the length tolerance of the inner tube needs to be ensured during manufacturing, and once the tolerance is exceeded, one end of the inner tube and the case are not tightly sealed, which can cause leakage of electrolyte in the battery cell.

In order to solve the problems, the applicant researches and finds that one end of the inner tube can be connected with the shell, the other end of the inner tube is a free end, a plugging structure is arranged at an opening of the free end of the inner tube, the length of the inner tube does not influence the connection between the inner tube and the shell, and a tube orifice of the free end is provided with the plugging structure, so that electrolyte in the shell can be prevented from leaking to the outside from the free end of the inner tube.

The embodiment of the application provides an electricity utilization device, which comprises a battery cell, a battery module or a battery pack, wherein the battery cell, the battery module or the battery pack provides electric energy for the electricity utilization device. The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take an electric device according to some embodiments of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery pack 100 is provided in the interior of the vehicle 1000, and the battery pack 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery pack 100 may be used for power supply of the vehicle 1000, for example, the battery pack 100 may serve as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery pack 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, the battery pack 100 may not only serve as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery pack 100 according to some embodiments of the present application. The battery pack 100 includes a battery pack case body 10 and at least one battery cell 20, and the battery cell 20 is accommodated in the battery pack case body 10. The battery pack housing body 10 is configured to provide an accommodating space for the battery cell 20, and the battery pack housing body 10 may have various structures. In some embodiments, the battery pack case body 10 may include a battery pack case 11 and an upper cover 12, the battery pack case 11 and the upper cover 12 being covered with each other, the battery pack case 11 and the upper cover 12 together defining an accommodating space for accommodating the battery cell 20. The upper cover 12 may have a hollow structure with an opening at one end, the battery pack case 11 may have a plate-shaped structure, and the battery pack case 11 covers the opening side of the upper cover 12, so that the battery pack case 11 and the upper cover 12 together define an accommodating space; the battery pack case 11 and the upper cover 12 may be hollow structures each having an opening at one side, and the opening side of the battery pack case 11 may be closed to the opening side of the upper cover 12. Of course, the battery pack case 11 formed by the battery pack case 11 and the upper cover 12 may be of various shapes, such as T-shaped, rectangular parallelepiped, etc.

In the battery pack 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the battery pack box 11; of course, the battery pack 100 may also be a battery module form formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole and be accommodated in the battery pack case 11. The battery pack 100 may further include other structures, for example, the battery pack 100 may further include a bus bar member for making electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a battery cell 20 according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery pack. The battery cell 20 includes a case 21, an electrode assembly, and other functional components.

The case 21 includes a top cap assembly 211 and a case body 212, and the top cap assembly 211 refers to a member that is covered at an opening of the case body 212 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the top cover assembly 211 may be adapted to the shape of the housing body 212 to fit the housing body 212. Alternatively, the top cover assembly 211 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the top cover assembly 211 is not easily deformed when being impacted by extrusion, and the battery cell 20 has a higher structural strength and improved safety. The cap assembly 211 may be provided with functional parts such as electrode terminals. The electrode terminals may be used to be electrically connected with the electrode assembly for outputting or inputting electric power of the battery cell 20. In some embodiments, a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold may also be provided on the top cap assembly 211. The material of the top cover assembly 211 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in this embodiment. In some embodiments, an insulator may also be provided on the inside of the cap assembly 211, which may be used to isolate electrical connection components within the housing 21 from the cap assembly 211 to reduce the risk of shorting. By way of example, the insulation may be plastic, rubber, or the like.

The case 21 is an assembly for cooperating with the cap assembly 211 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to accommodate the electrode assembly, the electrolyte, and other components. The case 21 and the top cap assembly 211 may be separate members, and an opening may be provided in the case 21, and the top cap assembly 211 covers the opening to form the internal environment of the battery cell 20. However, the top cover assembly 211 and the housing 21 may be integrated, and specifically, the top cover assembly 211 and the housing 21 may form a common connection surface before other components are put into the housing, and when the interior of the housing 21 needs to be sealed, the top cover assembly 211 is covered with the housing 21. The housing 21 may be of various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 21 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies may be contained within the case 21. The electrode assembly is mainly formed by winding or stacking a first electrode sheet and a second electrode sheet, and a separator is generally provided between the first electrode sheet and the second electrode sheet. The portions of the first and second electrode sheets having active material constitute the main body portion of the electrode assembly, and the portions of the first and second electrode sheets having no active material constitute the tabs, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected with the electrode terminal to form a current loop.

For convenience of description, the following examples will be described with reference to a single battery cell 20 according to some embodiments of the present application.

Referring to fig. 4 to 6, the battery cell 20 of the present application includes a case 21, an inner tube 22, and an electrode assembly 23. Wherein, the inner tube 22 is disposed in the housing 21, one end of the inner tube 22 is connected with the housing 21, and a cavity of the inner tube 22 penetrates through one end of the inner tube 22 and is communicated with the outside of the housing 21, the other end of the inner tube 22 is a free end, a tube orifice of the free end is provided with a blocking structure 22a for blocking the tube orifice, the housing 21 and the inner tube 22 together define a containing cavity, and the electrode assembly 23 is disposed in the containing cavity.

The plugging structure 22a may be, but not limited to, a plugging plate, a plug, etc., and the plugging member and the pipe orifice may be integrally formed.

The other end of the inner tube 22 is free, and the other end of the inner tube 22 is not connected with the shell 21, i.e. the other end of the inner tube 22 has a cantilever structure in the shell 21.

The shape of the housing 21 may be, but is not limited to, a cylinder, a flat body, a rectangular parallelepiped, or other shape, etc., and is not particularly limited herein.

The inner tube 22 may be a square tube, a round tube or a polygonal tube, and is not particularly limited herein.

The connection of one end of the inner tube 22 to the housing 21 may be a structure in which the inner tube 22 and the housing 21 are integrally formed.

The pipe orifice at the other end of the inner pipe 22 is provided with a blocking structure 22a for blocking the pipe orifice, and the blocking structure 22a blocks the pipe orifice of the inner pipe 22 and is in sealing connection with the pipe orifice of the inner pipe 22. Specifically, the connection between the orifice at the other end of the inner tube 22 and the blocking structure 22a may be an integrally formed structure.

In the embodiment of the application, the inner tube 22 is arranged in the shell 21, one end of the inner tube 22 is connected with the shell 21, the other end of the inner tube 22 is a free end, the length of the inner tube 22 does not affect the connection between the inner tube 22 and the shell 21, and the orifice of the free end is provided with a blocking structure, so that electrolyte in the shell 21 can be ensured not to leak to the outside from the free end of the inner tube 22. Therefore, the connection between the two ends of the inner tube 22 and the casing 21 can be avoided, the two ends of the inner tube 22 penetrate through the casing 21, and when the length tolerance of the inner tube 22 is not within the allowable range, the connection is unreliable due to the overlarge gap between one of the two ends of the inner tube 22 and the casing 21, so that the electrolyte in the casing 21 is easy to leak to the outside.

In some embodiments, referring to fig. 7 and 10, the housing 21 includes a housing body 212 and a top cover assembly 211. Wherein, the housing body 212 is provided with an opening, and the top cover assembly 211 covers the opening and is connected with the housing body 212. One end of the inner tube 22 is connected to the housing body 212 or the cap assembly 211.

For ease of understanding, the side of the housing body 212 where the opening is provided is defined as the top of the housing body 212, and the wall of the housing body 212 away from the opening in the depth direction of the opening is defined as the bottom 212a of the housing body 212.

One end of the inner tube 22 may be, but is not limited to being, connected to the bottom 212a of the housing body 212. Specifically, alternatively, one end of the inner tube 22 may be sealed and welded to the bottom 212a of the housing body 212, that is, the cavity of the inner tube 22 is not communicated with the inner cavity of the housing body 212, and the cavity of the inner tube 22 penetrates the bottom 212a of the housing body 212 from one end of the inner tube 22.

One end of the inner tube 22 may also be connected to the top cover 211 a. Specifically, alternatively, one end of the inner tube 22 may be sealed and welded to the top cover 211a, and the cavity of the inner tube 22 is communicated with the external environment of the housing 21 through the top cover 211a from one end of the inner tube 22.

One end of the inner tube 22 can be connected with the housing body 212 or the top cover assembly 211 of the housing 21, and the inner tube 22 can be reasonably selected to be connected with the housing body 212 or the top cover assembly 211 according to the use requirement.

When one end of the inner tube 22 is connected to the top cap 211a, the top cap 211a has a plate-shaped structure, which facilitates assembly of the electrode assembly 23 and the inner tube 22, and the electrode assembly 23 and the inner tube 22 are assembled and then mounted into the case body 212, thereby simplifying assembly.

When the one end of inner tube 22 is connected with casing body 212, can put into heat exchange structure in the box of battery package or battery module, heat exchange structure can be the heat exchange tube, heat exchange structure is put into in inner tube 22, can realize the cooling of battery package or battery module, also can realize the intensification when battery package or battery module temperature is too low, avoid battery package or battery module's temperature to be too low or too high, heat exchange structure stretches into in inner tube 22 from the bottom of casing body 212, even heat exchange medium in the heat exchange structure reveal can directly follow the cavity outflow of inner tube 22, and can not enter into inside battery monomer 20, the security of battery module or battery package has been improved.

In some embodiments, referring to fig. 5 and 7, the battery cell 20 includes a first insulating layer 26, at least a portion of the inner surface of the accommodating chamber is provided with the first insulating layer 26, and the first insulating layer 26 is used to insulate the electrode assembly 23 from the case 21 and insulate the electrode assembly 23 from the inner tube 22.

For example, a first insulating layer 26 may be provided at a surface of the case body 212 opposite to the electrode assembly 23 and an outer surface of the inner tube 22. For example, the first insulating layer 26 is provided on the inner surface of the sidewall of the case body 212, which faces the electrode assembly 23, the bottom 212a of the case body 212, and the outer surface of the inner tube 22.

Thus, the insulation between the inner tube 22 and the housing 21 and the electrode assembly 23 of the battery cell 20 can be realized, and the insulation is applied to the battery cell 20 with two polar posts 211d, so that the problem that potential safety hazards occur when the housing 21 is electrified can be avoided.

In some embodiments, referring to fig. 7 and 8, the electrode assembly 23 has a first tab and a second tab, the electrode assembly 23 is disposed around the inner tube 22, the top cap assembly 211 further includes a top cap 211a, a first post 211b and a second post 211c, the top cap 211a covers the opening, the second post 211c is electrically connected to the second tab, and the first post 211b is electrically connected to the first tab.

The first pole 211b may be electrically connected to the first tab through the first tab 24, may not be electrically connected to the first tab through the first tab 24, and the second pole 211c may be electrically connected to the second tab through the second tab 25, may not be electrically connected to the second tab through the second tab 25.

The top cover 211a may be a metal member or a non-metal member. To secure the strength of the battery cell 20, the top cap 211a is preferably a metal member.

The top cover 211a is disposed at the opening of the housing body 212 and connected to the housing body 212, and the connection between the top cover 211a and the housing body 212 may be, but not limited to, welding, bonding, etc.

For example, the top cover 211a is a metal piece, the first pole 211b and the second pole 211c are insulated and arranged on the top cover 211a at intervals, two insulating sleeves can be arranged on the top cover 211a at intervals, the first pole 211b and the second pole 211c are correspondingly arranged in the two insulating sleeves and extend out of the shell 21 from the inside of the insulating sleeves, and the insulating sleeves and the top cover 211a, the first pole 211b and the insulating sleeves and the second pole 211c and the insulating sleeves can be adhered and fixed through insulating glue.

Thus, the case body 212 may not be used as the positive electrode or the negative electrode in the battery cell 20, the battery cell 20 has the first electrode post 211b and the second electrode post 211c, the first electrode post 211b and the second electrode post 211c are used as the positive electrode and the negative electrode of the battery cell 20 alone, and good insulation effects are achieved between the case body 212 and the electrode assembly 23 and between the inner tube 22 and the electrode assembly 23 by the arrangement of the insulating layer, so that the problem of electric leakage is avoided.

In some embodiments, referring to fig. 6, the battery cell 20 further includes a second insulating layer 27, the housing 21 has an outer surface facing away from the accommodating cavity, the inner tube 22 has an inner surface facing away from the accommodating cavity, and a portion of the outer surface of the housing 21 and/or the inner surface of the inner tube 22 is provided with the second insulating layer 27.

The inner surface of the inner tube 22 in the embodiments of the present application refers to the surface of the inner tube 22 facing the cavity of the inner tube 22.

The outer surface of the inner tube 22 in the embodiments of the present application refers to the surface of the inner tube 22 facing the accommodation space.

Alternatively, the second insulating layer 27 may be provided on a part of the outer surface of the sidewall of the case 21 and the entire outer bottom surface of the case 21. Specifically, the second insulating layer 27 may not be provided at a portion of the outer surface of the side wall of the case body 212 close to the opening, and the second insulating layer 27 may be provided at other positions of the outer surface of the case body 212.

The second insulating layer 27 is disposed on a part of the outer surface of the casing 21 and the inner surface of the inner tube 22, so that a part of the outer surface of the casing 21, which is not provided with the second insulating layer 27, can be used as the positive electrode or the negative electrode of the battery cell 20, and the structure of the battery cell 20 is simpler and more compact.

In some embodiments, referring to fig. 9-12, the electrode assembly 23 has a first tab and a second tab, the electrode assembly 23 is disposed around the inner tube 22, the first tab is electrically connected with the housing 21, the top cap assembly 211 further includes a top cap 211a and a post 211d, the top cap 211a covers the opening, and the post 211d is electrically connected with the second tab and is electrically connected with the top cap 211a in an insulating manner.

The first tab may be electrically connected to the case 21 through the first tab 24, or may be electrically connected to the case 21 without the first tab 24.

The second tab may be electrically connected to the pole 211d through the second switching piece 25, or may be electrically connected to the pole 211d without the second switching piece 25.

The electrode post 211d is electrically connected to the second electrode tab, and can be used as a positive electrode or a negative electrode of the battery, that is, the first electrode post 211b can be used as a positive electrode of the battery cell 20, and the case 21 can be used as a negative electrode of the battery cell 20. The first electrode post 211b may be used as a negative electrode of the battery cell 20, and the case 21 may be used as a positive electrode of the battery. Only one pole 211d is provided in the battery cell 20, and the structure of the battery cell 20 can be simplified.

In some embodiments, the battery cell 20 further includes a third insulating layer 28, the cap assembly 211 further includes a cap 211a, and the third insulating layer 28 is disposed between the cap assembly 211 and the electrode assembly 23.

Therefore, the top cover 211a can be insulated, and electric leakage of the top cover 211a is avoided, so that safety of the battery cell 20 in the use process is ensured.

The first insulating layer 26, the second insulating layer 27, and the third insulating layer 28 mentioned in the embodiments of the present application may each be an insulating coating, an insulating paste, or an insulating film.

In some embodiments, the inner tube 22 and the side wall of the housing 21 define a receiving cavity therebetween, which is an annular receiving space.

Thereby, the space in the case body 212 can be fully utilized.

In some embodiments, the inner tube 22 is a straight tube, and the length direction of the inner tube 22 is the same as the opening direction.

The same length direction of the inner tube 22 as the depth direction of the opening means that one end of the inner tube 22 faces the opening and the other end of the inner tube 22 faces the bottom 212a of the housing body 212.

Thus, the electrode assembly 23 can be more easily disposed on the inner tube 22, and the structure can be more simplified.

In some embodiments, the housing 21 is a square housing 21 structure or a circular housing 21 structure; and/or the inner tube 22 is a round tube or a square tube.

Specifically, alternatively, when the housing 21 is of a square box structure, the inner tube 22 is a square tube; when the housing 21 is a circular box structure, the inner tube 22 is a circular tube. When the electrode assembly 23 of the battery cell 20 is circumferentially disposed on the inner tube 22, the electrode assembly 23 can fully occupy the annular accommodating space, which is beneficial to improving the energy density of the battery cell 20.

The shell 21 is in a square shell 21 structure, and/or the inner tube 22 is a round tube or a square tube, so that the shell 21 can be used in the square battery cell 20; the housing 21 has a circular housing 21 structure and/or the inner tube 22 has a circular tube or square tube, so that the housing 21 can be used in the circular battery cell 20.

In some embodiments, the housing 21 is integrally formed with the inner tube 22; and/or the shell 21, the inner tube 22 and the blocking structure 22a are integrally formed.

It is understood that the integral molding mentioned in the embodiments of the present application is, but not limited to, molding by welding, extruding, turning, etc.

Thereby, the connection of the housing 21 and the inner tube 22 can be made more reliable.

In some embodiments, electrode assembly 23 is a coiled structure disposed around inner tube 22; or a lamination of the electrode assembly 23.

The electrode assembly 23 may include a first electrode sheet, a second electrode sheet, and a separator. The first pole piece and the second pole piece are wound or stacked, and a diaphragm is arranged between the first pole piece and the second pole piece.

Illustratively, a coiled electrode assembly 23 is employed with a coiled aperture formed centrally through the inner tube 22 such that the electrode assembly 23 is disposed around the inner tube 22. The structure employing the wound electrode assembly 23 may be applied to a circular battery cell 20 or a square battery cell 20.

For example, a laminated structure may be adopted, and the first pole piece and the second pole piece are stacked along the length direction of the inner tube 22, and a diaphragm is arranged between the first pole piece and the second pole piece.

The coiled electrode assembly 23 is adopted, so that the installation of the electrode assembly 23 can be facilitated, namely, the electrode assembly 23 can be arranged on the inner tube 22 in a penetrating way after being coiled, or the inner tube 22 can be connected with the shell 21 after being coiled, so that the electrode assembly 23 is convenient to assemble. And the lamination-shaped structure is adopted, so that the charge and discharge power is better, and the space utilization rate of the lamination is higher.

For convenience of description, the following examples will take a battery of some embodiments of the present application as an example.

Referring to fig. 13, the battery includes the above-described battery cells.

The number of the battery cells may be one or a plurality, and may be specifically set according to actual requirements, which is not specifically limited herein.

It should be noted that the battery may refer to a battery module or a battery pack.

Since the battery includes all technical features of the battery cell 20, the effects are the same as those described above, and thus, a detailed description thereof will be omitted.

In some embodiments, referring to fig. 13-16, the battery further includes a heat exchange device 400, and the heat exchange device 400 is thermally coupled to the battery cells.

Thermal coupling means that heat exchange can be performed between two objects. For example, the two objects can exchange heat in a contact manner, can exchange heat in a non-contact manner, and can exchange heat through the heat conductor. The heat exchange modes listed above all belong to thermal coupling.

The heat exchanging device 400 and the battery cell 20 can exchange heat, which is beneficial to heat dissipation of the battery.

In some embodiments, referring to fig. 15 and 16, the heat exchange device 400 includes a heat exchange bottom plate 111, the heat exchange bottom plate 111 is located at the bottom of the battery cell 20 and is thermally coupled to the battery cell 20, a heat exchange flow channel 111a is disposed inside the heat exchange bottom plate 111, and the heat exchange flow channel 111a is configured to flow in and out a heat exchange medium.

Specifically, the heat exchange flow channel 111a is provided with a flow channel inlet and a flow channel outlet, and a heat exchange medium can be introduced into the flow channel inlet, and flows out from the flow channel outlet to realize inflow and outflow of the heat exchange medium.

The heat exchange medium can be a liquid heat exchange medium or a gas heat exchange medium. The liquid heat exchange medium is adopted to cool the battery better in cooling effect, and the heat exchange is faster, so that the battery can be warmed up or cooled down. The liquid heat exchange medium may be water, for example. When the number of the battery cells 20 is small, the gas heat exchange medium may be used to heat or cool the battery cells 20, for example, cool air or hot air is introduced into the heat exchange flow channel 111 a.

The heat exchange medium is introduced into the heat exchange flow channel 111a, and can circulate in the heat exchange flow channel 111a in a circulating manner, so that the heat exchange effect of the battery cell 20 is improved. The heat exchange flow channel 111a may exchange heat with the battery cell 20 of the battery module or the battery pack. Illustratively, the heat exchange bottom plate 111 may be fixed to the bottom of the battery cell 20 of the battery module.

In some embodiments, referring to fig. 15, 18 and 20, the battery further includes a plurality of side plates 112, the edges of the plurality of heat exchange bottom plates 111 are connected with the side plates 112, and the plurality of side plates 112 and the heat exchange bottom plates 111 together define a box body with an accommodating space, and the battery cells 20 are located in the accommodating space.

Alternatively, a plurality of side plates 112 may be welded to the heat exchange bottom plate 111.

The plurality of side plates 112 and the heat exchange bottom plate 111 together define a case having an accommodating space, the case may be used as a case of the battery pack, and the heat exchange bottom plate 111 serves as a part of the case, and compared with the case where the heat exchange bottom plate 111 is separately installed at the bottom of the case of the battery pack, the volume of the battery pack may be reduced and the heat exchange effect may be improved.

In some embodiments, referring to fig. 13, 14, 18 and 20, the heat exchange device 400 further includes a first heat conducting member 29, the first heat conducting member 29 is connected to the heat exchange bottom plate 111, and at least a part of the surface of the first heat conducting member 29 is disposed against the outer surface of the battery cell 20.

The number of the first heat conductive members 29 may be one or more, and is not particularly limited herein.

The first heat conducting member 29 may be in a wavy plate shape, the battery cells 20 are in a cylindrical shape, the battery cells 20 are in a plurality of rows, the adjacent two rows of battery cells 20 may be staggered, the first heat conducting member 29 is disposed between the adjacent two rows of battery cells, and the recess of the first heat conducting member 29 may accommodate the battery cells 20.

The first heat conductive member 29 may be in a flat plate shape, and the battery cell 20 is a square battery cell, for example. The number of the battery cells 20 is plural, and the battery cells 20 are arranged in a plurality of rows, and a first heat conducting member 29 is arranged between two adjacent rows of battery cells 20.

The first heat conducting member 29 may be elongated, and the length direction of the first heat conducting member 29 is the same as the height direction of the battery cell 20.

The first heat conductive member 29 may preferably be made of a material having good heat conductive properties. Such as elemental copper, copper alloy, elemental aluminum, aluminum alloy, steel, and the like. Nonmetallic materials such as heat-conducting silica gel, aluminum nitride, silicon carbide and the like can also be adopted.

At least part of the surface of the first heat conducting member 29 is abutted against the outer surface of the battery cell 20, and at least part of the surface of the first heat conducting member 29 is contacted with the outer surface of the battery cell 20, and the two may be fixed together or not fixed and only contacted.

The first heat conducting member 29 can increase the heat transfer rate between the battery cell 20 and the heat exchange flow channel 111a, and improve the external heat dissipation effect of the battery cell.

In some embodiments, referring to fig. 14-21, the heat exchange device 400 further includes a second heat conducting member 30, the second heat conducting member 30 is connected with the heat exchange bottom plate 111, and the second heat conducting member 30 is located inside the inner tube 22.

The second heat conductive member 30 may preferably be made of a material having good heat conductive properties. The second heat conductive member 30 may be, but is not limited to, elemental copper, copper alloy, elemental aluminum, aluminum alloy, steel, etc.

The second heat conductive member 30 is fixed to the heat exchange base plate 111 by connecting fingers. Specifically, the second heat conductive member 30 may be connected to the heat exchange bottom plate 111 by welding or plugging, or the like.

The second heat conductive member 30 may have a cylindrical shape, and the cross section of the second heat conductive member 30 may have a cylindrical shape, may have a shape of, but not limited to, a regular polygon or a star-shaped handle, and may increase the heat transfer area and heat exchange efficiency. The second heat conductive member 30 may have a solid columnar shape or a hollow columnar shape, and is not particularly limited herein.

The second heat conducting member 30 is disposed inside the inner tube 22, so as to accelerate the heat exchange between the center of the electrode assembly and the heat exchange bottom plate 111, and further improve the heat dissipation effect of the battery.

In some embodiments, at least a portion of the outer surface of the second thermally conductive member 30 is connected to the inner surface of the cavity of the inner tube 22 by a thermally conductive adhesive.

The second heat conducting member 30 is connected with the inner tube through the heat conducting glue, so that on one hand, the connection strength between the inner tube 22 and the second heat conducting member 30 can be increased, and on the other hand, the heat conducting property of the heat conducting glue is beneficial to heat conduction, so that the heat transfer speed between the electrode assembly and the heat exchange bottom plate 111 can be improved.

In some embodiments, referring to fig. 16-21, the second heat conducting member 30 is a heat exchange tube, the heat exchange tube has a first heat exchange port and a second heat exchange port, the heat exchange channel 40 has a first heat exchange channel port and a second heat exchange channel port, the first heat exchange channel port is connected with the first heat exchange port, and the second heat exchange channel port is connected with the second heat exchange port.

The connection of the first heat exchange runner port and the first heat exchange port means that the first heat exchange runner port and the first heat exchange port are in butt joint and fixed together, and if the annular sealing ring can be arranged at the first heat exchange runner port or the first heat exchange port, the annular sealing ring is in sealing connection in an inserting mode. Similarly, the second heat exchange runner port and the second heat exchange port can be connected in the same manner.

Therefore, the heat exchange medium in the heat exchange flow channel 111a can enter the heat exchange tube and flow back to the heat exchange flow channel 111a through the heat exchange tube to form circulating heat exchange, so that the heat exchange effect of the heat exchange channel and the heat exchange bottom plate 111 can be quickened.

In some embodiments, referring to fig. 16 and 17, the pipe orifice of the heat exchange pipe is disposed towards one side of the heat exchange bottom plate 111, a partition plate 31 extending along the length direction of the heat exchange pipe is disposed in the pipe cavity of the heat exchange pipe, the partition plate 31 divides the pipe cavity into a first flow channel and a second flow channel communicated with the first flow channel, and the first flow channel and the second flow channel form a first heat exchange port and a second heat exchange port in one-to-one correspondence with the pipe orifice of the heat exchange pipe.

Illustratively, the communication position of the first flow channel and the second flow channel may be disposed at the distal end of the heat exchange tube, which may increase the flow path of the heat exchange medium and improve the heat exchange effect. It should be noted that the proximal end of the heat exchange tube refers to one end connected to the heat exchange base plate 111, and the distal end refers to the other end of the heat exchange tube.

The heat exchange tube may be a straight tube or an elbow, and is not particularly limited herein.

In some embodiments, referring to fig. 15 and 16, the heat exchange tube is a straight tube.

The straight pipe can facilitate the manufacture of the heat exchange pipe, and compared with a structure adopting an elbow pipe, the straight pipe can ensure the connection strength of the spacing plate 31 and the heat exchange pipe, so that the structure is simpler.

In some embodiments, referring to fig. 18 and 19, the heat exchange tube is a U-shaped tube 303, two ends of the U-shaped tube 303 are connected to the heat exchange bottom plate 111, and specifically, two tube openings of the U-shaped tube 303 are connected to the first heat exchange runner port and the second heat exchange runner port of the heat exchange bottom plate 111 in a one-to-one correspondence manner. In other embodiments, referring to fig. 20 and 21, the heat exchange tube is a spiral tube 304, two ends of the spiral tube 304 are connected to the heat exchange bottom plate 111, and specifically, two tube openings of the spiral tube 304 are connected to the first heat exchange runner opening and the second heat exchange runner opening of the heat exchange bottom plate 111 in a one-to-one correspondence manner.

For convenience of description, please refer to fig. 4, 5, 7 and 8, which illustrate a battery cell 20 according to some embodiments of the present application.

The battery cell 20 of the present application includes a case 21, an inner tube 22, and an electrode assembly 23. Wherein, the inner tube 22 is disposed in the housing 21, one end of the inner tube 22 is connected with the housing 21, and a cavity of the inner tube 22 penetrates through one end of the inner tube 22 and is communicated with the outside of the housing 21, the other end of the inner tube 22 is a free end, a tube orifice of the free end is provided with a blocking structure 22a for blocking the tube orifice, the housing 21 and the inner tube 22 together define a containing cavity, and the electrode assembly 23 is disposed in the containing cavity.

The housing 21 includes a housing body 212 and a top cover assembly 211. Wherein, the housing body 212 is provided with an opening, and the top cover assembly 211 covers the opening and is connected with the housing body 212. One end of the inner tube 22 is connected to the housing body 212 or the cap assembly 211.

The battery cell 20 includes a first insulating layer 26, and at least a portion of the inner surface of the receiving chamber is provided with the first insulating layer 26, and the first insulating layer 26 serves to insulate the electrode assembly 23 from the case 21 and the electrode assembly 23 from the inner tube 22.

The battery cell 20 has a first tab and a second tab, the electrode assembly 23 is disposed around the inner tube 22, the top cap assembly 211 further includes a top cap 211a, a first post 211b and a second post 211c, the top cap 211a covers the opening, the second post 211c is electrically connected with the second tab, and the first post 211b is electrically connected with the first tab.

The battery cell 20 further includes a third insulating layer 28, and the third insulating layer 28 is disposed between the top cap 211a and the electrode assembly 23.

The inner tube 22 and the side wall of the housing 21 define a receiving chamber therebetween, which is an annular receiving space.

The inner tube 22 is a straight tube, and the longitudinal direction of the inner tube 22 is the same as the opening direction.

The shell 21 is a square shell 21 structure or a round shell 21 structure; and/or the inner tube 22 is a round tube or a square tube.

The housing 21 is integrally formed with the inner tube 22; and/or the shell 21, the inner tube 22 and the blocking structure 22a are integrally formed.

The electrode assembly 23 is a coiled structure arranged on the heat exchange inner tube 22; or a lamination of the electrode assembly 23.

For convenience of description, please refer to fig. 4, 6, and 9-12, which illustrate a battery cell 20 according to some embodiments of the present application.

The battery cell 20 of the present application includes a housing 21 and an inner tube 22. Wherein, the inner tube 22 is disposed in the housing 21, one end of the inner tube 22 is connected with the housing 21, and a cavity of the inner tube 22 penetrates through one end of the inner tube 22 and is communicated with the outside of the housing 21, the other end of the inner tube 22 is a free end, a tube orifice of the free end is provided with a blocking structure 22a for blocking the tube orifice, the housing 21 and the inner tube 22 together define a containing cavity, and the containing cavity is used for containing the electrode assembly 23 of the battery cell 20.

One end of the inner tube 22 may not be limited to being connected to the bottom 212a of the housing body 212. Alternatively, one end of the inner tube 22 may be welded to the bottom 212a of the housing body 212, and the cavity of the inner tube 22 penetrates the bottom 212a of the housing body 212 from one end of the inner tube 22.

When the one end of inner tube 22 is connected with casing body 212, can put into heat exchange structure in the box of battery package or battery module, heat exchange structure can be the heat exchange tube, and heat exchange structure is put into in inner tube 22, can realize the cooling of battery package or battery module, and heat exchange structure stretches into in inner tube 22 from the bottom of casing body 212, even heat exchange medium in the heat exchange structure reveal can directly follow the cavity outflow of inner tube to can not enter into inside battery monomer 20, improved the security of battery module or battery package.

The battery cell 20 further comprises a second insulating layer 27, the housing 21 having an outer surface facing away from the receiving cavity, the inner tube 22 having an inner surface facing away from the receiving cavity, a part of the outer surface of the housing 21 and/or the inner surface of the inner tube 22 being provided with the second insulating layer 27.

The battery cell 20 further includes an electrode assembly 23 having a first tab and a second tab, the electrode assembly 23 is disposed around the inner tube 22, the first tab is electrically connected with the case 21, the top cap assembly 211 further includes a top cap 211a and a post 211d, the top cap 211a covers the opening, and the post 211d is electrically connected with the second tab and is electrically connected with the top cap 211 a.

The battery cell 20 further includes a third insulating layer 28, and the third insulating layer 28 is disposed between the cap assembly 211 and the electrode assembly 23.

The electrode assembly 23 is a wound-like structure disposed around the inner tube 22; or a lamination of the electrode assembly 23.

The battery includes the above-described battery cells 20.

The number of the battery cells 20 may be one or more, and may be specifically set according to actual needs, and is not specifically limited herein.

Referring to fig. 13-16, the battery further includes a heat exchange device 400, and the heat exchange device 400 is thermally coupled to the battery cell 20.

Referring to fig. 15 and 16, the heat exchange device 400 includes a heat exchange bottom plate 111, the heat exchange bottom plate 111 is located at the bottom of the battery cell 20 and is thermally coupled to the battery cell 20, a heat exchange flow channel 111a is disposed inside the heat exchange bottom plate 111, and the heat exchange flow channel 111a is configured to flow in and out a heat exchange medium.

Specifically, the heat exchange flow channel 111a is provided with a flow channel inlet and a flow channel outlet, and a heat exchange medium can be introduced into the flow channel inlet, and flows out from the flow channel outlet to realize the inflow and outflow of the heat exchange medium in the heat exchange flow channel 111 a.

Referring to fig. 15, 18 and 20, the battery further includes a plurality of side plates 112, the edges of the plurality of heat exchange bottom plates 111 are connected with the side plates 112, the plurality of side plates 112 and the heat exchange bottom plates 111 together define a box body with an accommodating space, and the battery unit 20 is located in the accommodating space.

Referring to fig. 13, 14, 18 and 20, the heat exchange device 400 further includes a first heat conducting member 29, the first heat conducting member 29 is connected to the heat exchange bottom plate 111, and at least a portion of the surface of the first heat conducting member 29 is disposed against the outer surface of the battery cell 20.

Referring to fig. 14 to 21, the heat exchanging device 400 further includes a second heat conducting member 30, the second heat conducting member 30 is connected to the heat exchanging bottom plate 111, and the second heat conducting member 30 is located inside the inner tube 22.

The second heat conductive member 30 may be connected to the heat exchange bottom plate 111 by welding or plugging, etc., and the specific connection manner is not particularly limited.

At least a portion of the outer surface of the second heat conductive member 30 is connected to the inner surface of the cavity of the inner tube 22 by a heat conductive paste.

In some embodiments, referring to fig. 16-21, the second heat conducting member 30 is a heat exchange tube, the heat exchange tube has a first heat exchange port and a second heat exchange port, the heat exchange channel 111a has a first heat exchange channel port and a second heat exchange channel port, the first heat exchange channel port is connected with the first heat exchange port, and the second heat exchange channel port is connected with the second heat exchange port.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, comprising:

a housing;

2. The battery cell of claim 1, wherein the housing comprises:

a housing body provided with an opening;

one end of the inner tube is connected with the shell body or the top cover assembly.

3. The battery cell of claim 2, wherein the battery cell further comprises:

and a first insulating layer provided on at least a portion of an inner surface of the receiving chamber, the first insulating layer being for insulating the electrode assembly from the case and insulating the electrode assembly from the inner tube.

4. The battery cell of claim 2, wherein the electrode assembly has a first tab and a second tab, the electrode assembly is disposed around the inner tube, the cap assembly further comprises a cap, a first post, and a second post, the cap is disposed over the opening, the second post is electrically connected to the second tab, and the first post is electrically connected to the first tab.

5. The battery cell of claim 2, further comprising a second insulating layer, wherein the housing has an outer surface facing away from the receiving cavity, wherein the inner tube has an inner surface facing away from the receiving cavity, and wherein a portion of the outer surface of the housing and/or the inner surface of the inner tube is provided with the second insulating layer.

6. The battery cell of claim 5, wherein the electrode assembly has a first tab and a second tab, the first tab being electrically connected to the housing, the top cap assembly further comprising a top cap and a post, the top cap being disposed over the opening, the post being insulated from the top cap and being electrically connected to the second tab.

7. The battery cell of claim 2, further comprising a third insulating layer, wherein the cap assembly comprises a cap, and wherein the third insulating layer is disposed between the cap and the electrode assembly.

8. The battery cell of claim 1, wherein the receiving cavity is an annular receiving space.

9. The battery cell according to any one of claims 2 to 7, wherein the inner tube is a straight tube, and a length direction of the inner tube is the same as an orientation of the opening.

10. The battery cell of any one of claims 1-8, wherein the housing is a square housing structure or a circular housing structure; and/or the inner pipe is a round pipe or a square pipe.

11. The battery cell of any one of claims 1-8, wherein the housing is integrally formed with the inner tube; and/or the shell, the inner tube and the plugging structure are integrally formed.

12. The battery cell according to any one of claims 1-8, wherein the electrode assembly is a coiled structure disposed around the inner tube; or the electrode assembly is a lamination-like structure.

13. A battery comprising a cell according to any one of claims 1-12.

14. The battery of claim 13, further comprising a heat exchange device thermally coupled to the battery cell.

15. The battery of claim 14, wherein the heat exchange device comprises:

the heat exchange bottom plate is positioned at the bottom of the battery unit and is thermally coupled with the battery unit, a heat exchange flow channel is arranged in the heat exchange bottom plate and is configured to flow in and out of a heat exchange medium.

16. The battery of claim 15, further comprising a plurality of side plates, wherein the side plates are connected to edges of the plurality of heat exchange bottom plates, and wherein the plurality of side plates and the heat exchange bottom plates together define a box having an accommodation space, wherein the battery cells are located in the accommodation space.

17. The battery of claim 15 or 16, wherein the heat exchange device further comprises a first heat conducting member, the first heat conducting member is connected to the heat exchange base plate, and at least a portion of a surface of the first heat conducting member is disposed in contact with an outer surface of the battery cell.

18. The battery of claim 15 or 16, wherein the heat exchange device further comprises a second heat conducting member, the second heat conducting member is connected to the heat exchange bottom plate, and the second heat conducting member is located inside the inner tube.

19. The battery of claim 18, wherein the second heat transfer member is a heat transfer tube having a first heat transfer port and a second heat transfer port, the heat transfer channel having a first heat transfer channel port and a second heat transfer channel port, the first heat transfer channel port being connected to the first heat transfer port, the second heat transfer channel port being connected to the second heat transfer port.

20. The battery according to claim 19, wherein the pipe orifice of the heat exchange pipe is arranged towards one side of the heat exchange bottom plate, a partition plate extending along the length direction of the heat exchange pipe is arranged in the pipe cavity of the heat exchange pipe, the partition plate divides the pipe cavity into a first flow passage and a second flow passage communicated with the first flow passage, and the first flow passage and the second flow passage form the first heat exchange port and the second heat exchange port in one-to-one correspondence with the pipe orifice of the heat exchange pipe;

and/or the heat exchange tube is a straight tube.

21. The battery of claim 19, wherein the heat exchange tube is a spiral tube or a U-shaped tube.

22. An electrical device comprising a cell according to any one of claims 1-12 for providing electrical energy;

alternatively, a battery according to any of claims 13-21, comprising means for providing electrical energy.