CN216288850U - Battery cell, battery and power consumption device - Google Patents

Abstract

The application provides a battery monomer, battery and power consumption device, battery monomer includes: a housing; an electrode terminal provided to the case; an electrode assembly disposed within the case, the electrode assembly having tabs; the connecting piece, including body and radiating part, the body is used for electric connection utmost point ear and electrode terminal, and the radiating part is connected in the body, and the radiating part is used for increasing the heat radiating area of connecting piece. The technical scheme of this application is provided with the heat dissipation portion at the connecting piece, when welding the connecting piece in electrode subassembly's utmost point ear, the heat that the heat dissipation portion can accelerate the scatter welding production, effectively alleviate the welding heat and weld through the connecting piece and utmost point ear and rub the flat district, scald the problem of electrode subassembly's barrier film at the local too big accumulation of connecting piece, thereby effectively reduce the phenomenon that the connecting piece damages electrode subassembly when welding in electrode subassembly, and then effectively prolong the free life of battery and improve the free performance of battery.

Description

Battery cell, 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 electric device.

Background

The rechargeable battery has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, and is widely applied to electric automobiles, mobile equipment or electric tools. With the continuous development of battery technology, higher requirements are also put on the quality and service life of the battery.

The current battery is easy to damage the electrode component in the assembly production process, and the service life of the battery is influenced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a battery monomer, battery and power consumption device, can effectively alleviate the problem that influences battery life because of damaging electrode subassembly in the battery equipment.

In a first aspect, the present application provides a battery cell, comprising: a housing; an electrode terminal provided to the case; an electrode assembly disposed within the case, the electrode assembly having tabs; the connecting piece comprises a body and a heat dissipation part, wherein the body is used for electrically connecting the electrode lug and the electrode terminal, the heat dissipation part is connected to the body, and the heat dissipation part is used for increasing the heat dissipation area of the connecting piece.

According to the technical scheme, the electrode assembly is arranged in the shell and provided with the lugs, the lugs are connected with the electrode terminals through the connecting pieces, and the connecting pieces are connected with the lugs in a welding mode. Through set up the heat radiating part at the connecting piece and increase the heat radiating area of connecting piece in this application, when welding the connecting piece in electrode subassembly's utmost point ear, the heat that the heat radiating part can accelerate the scatter welding production, effectively alleviate the welding heat and weld through connecting piece and utmost point ear at the local too big accumulation of connecting piece and rub the flat district, scald the problem of electrode subassembly's barrier film, play certain guard action to electrode subassembly, thereby reduce the free self-discharge of battery that causes because of electrode subassembly's barrier film is scalded, the problem of low-voltage produces, and then effectively prolong the free life of battery and improve the free performance of battery.

In some embodiments, the electrode assembly has a central hole into which the heat dissipation part is inserted.

In the technical scheme, the heat dissipation part is inserted into the central hole of the electrode assembly, on one hand, the heat dissipation part has the functions of heat conduction and heat dissipation, and the welding heat of the connecting piece is quickly led into the central hole of the electrode assembly through the heat dissipation part and is dispersed; on the other hand, the heat dissipation part extends into the central hole of the electrode assembly to support the central hole of the electrode assembly to a certain extent, so that the problem of collapse of the central hole of the electrode assembly can be effectively relieved, and the risk of lithium precipitation caused by collapse of the central hole of the electrode assembly is effectively reduced; and the heat dissipation part is inserted into the central hole of the electrode assembly, so that the lug after being flattened can be effectively prevented from blocking the central hole of the electrode assembly, the smoothness of gas of a battery monomer is favorably improved, therefore, the stability of the electrode assembly is further improved by the design that the heat dissipation part is inserted into the central hole of the electrode assembly, the heat dissipation part has the heat conduction and heat dissipation function and the electrode assembly supporting function due to the design, and the structure is compact, and the function integration is strong.

In some embodiments, the heat dissipating part is a heat dissipating pipe, and one end of the heat dissipating pipe is connected to the body.

Among the above-mentioned technical scheme, the radiating part adopts the cooling tube, on the one hand, cooling tube heat radiating area is big, can heat conduction and dispersion heat fast, and be convenient for carry out the heat exchange fast with medium on every side, improve the radiating efficiency of connecting piece, on the other hand, the cooling tube inserts the centre bore, the volume proportion to the centre bore has been reduced as far as possible when playing the supporting role to the centre bore, and the inner chamber of cooling tube can form gas passage, so that the inside gaseous inner chamber discharge of forming of battery monomer through the cooling tube.

In some embodiments, the body is provided with a first through hole, and the first through hole is communicated with the inner cavity of the radiating pipe.

Among the above-mentioned technical scheme, set up the first through-hole with the inner chamber intercommunication of cooling tube on the body, first through-hole and the cooperation of cooling tube inner chamber form gas passage to the gas that produces in the battery monomer gets into the cooling tube and discharges through first through-hole.

In some embodiments, the pipe wall of the radiating pipe is provided with a second through hole.

Among the above-mentioned technical scheme, set up the second through-hole on the pipe wall of cooling tube for the inside gas that produces of battery monomer can get into the cooling tube and discharge through first through-hole through the second through-hole, further improves gas outgoing's patency and gas discharge efficiency.

In some embodiments, a plurality of rows of the second through holes are formed in the pipe wall of the radiating pipe, each row of the second through holes includes a plurality of second through holes distributed at intervals in the axial direction of the radiating pipe, and the plurality of rows of the second through holes are distributed at intervals in the circumferential direction of the radiating pipe.

Among the above-mentioned technical scheme, set up the multiseriate second through-hole along the circumference interval distribution of cooling tube on the pipe wall of cooling tube, and every row of second through-hole contains a plurality of second through-holes along the axial interval distribution of cooling tube, such design makes the pipe wall of cooling tube form the gaseous air inlet face of multi-angle and effectively increases the area of gaseous air inlet face, the gas of being convenient for to produce in the battery monomer is nearby, discharge after different second through-holes get into the cooling tube fast, thereby further improve the unobstructed nature and the homogeneity of gas outgoing in the battery monomer.

In some embodiments, two adjacent columns of the second through holes are arranged in a staggered manner.

Among the above-mentioned technical scheme, the second through-hole dislocation set that adjacent two was listed as on the cooling tube, such design plays the guard action to the structural strength of cooling tube itself, has effectively protected the resistance deformation nature of cooling tube when increase cooling tube area of admitting air.

In some embodiments, the inner surface of the heat dissipation pipe is provided with a gas adsorption material for adsorbing gas generated inside the battery cell.

Among the above-mentioned technical scheme, the internal surface of cooling tube sets up gas adsorption material, and gas adsorption material can absorb the gas that gets into the cooling tube inner chamber to reduce the inside gas quantity of battery monomer, further reduce the single interior pressure of battery, improve the free full life cycle's of battery security.

In some embodiments, the heat dissipating portion is a heat sink, one end of the heat sink is connected to the body, and the other end is a free end.

Among the above-mentioned technical scheme, connect the fin on the body to directly increase the heat radiating area of body, the welding heat when welding the connecting piece in utmost point ear through the fin disperses fast, in order to alleviate the welding heat and weld the problem that crosses the barrier film of connecting piece and utmost point ear kneading flat area, scald electrode subassembly at the local too big accumulation of connecting piece.

In some embodiments, the fins have folds between the fins and the body.

Among the above-mentioned technical scheme, have the crease between fin and the body, in the assembling process, can paste the fin on the body from folding back in crease to effectively reduce the space occupancy of fin.

In some embodiments, the body includes a terminal connection portion for connecting the electrode terminals, a tab connection portion for connecting the tabs, and a transition portion for connecting the terminal connection portion and the tab connection portion, and the heat dissipation portion is connected to the tab connection portion.

Among the above-mentioned technical scheme, the body includes terminal connecting portion, utmost point ear connecting portion and transition portion, and transition portion connects terminal connecting portion and utmost point ear connecting portion, and on the one hand, utmost point ear connecting portion and terminal connecting portion are relatively independent, the equipment of being convenient for, and on the other hand, being provided with of transition portion does benefit to the reduction and takes place to remove and lead to utmost point ear connecting portion and electrode subassembly to break away from the possibility of connecting because of the relative electrode subassembly of terminal connecting portion.

In some embodiments, the heat sink portion is the same material as the body.

Among the above-mentioned technical scheme, the material of heat dissipation portion is the same with the material of body, and the heat dissipation portion of being convenient for welds or integrated into one piece with the body, and guarantees the heat dissipation performance of heat dissipation portion.

In a second aspect, the present application provides a battery comprising a battery cell according to any of the above embodiments.

In a third aspect, the present application provides an electric device, comprising the battery in the above embodiments, wherein the battery is used for providing electric energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

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

fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure;

FIG. 4 is an exploded view of a connector configuration provided in accordance with certain embodiments of the present application;

fig. 5 is a cross-sectional view of a battery cell provided in accordance with some embodiments of the present application;

fig. 6 is a cross-sectional view of a battery cell provided in accordance with further embodiments of the present application;

fig. 7 is a schematic structural diagram of a connector according to further embodiments of the present application.

Icon: 1000-a vehicle; 100-a battery; 200-a controller; 300-a motor; 10-a box body; 11-a first part; 12-a second part; 20-a battery cell; 21-a housing; 211-a housing; 212-a cover; 212 a-first cover; 212 b-a second cover; 22-electrode terminals; 22 a-a first electrode terminal; 22 b-a second electrode terminal; 23-an electrode assembly; 231-a tab; 231 a-first tab; 231 b-a second tab; 232-central hole; 24-a connector; 24 a-a first connector; 24 b-a second connector; 241-a heat sink; 242 — a first via; 243-tab connection part; 241 a-a first heat sink portion; 241 b-a second heat sink portion; 2411-radiating pipe; 2412-a second through hole; 2413-cooling fins; 2431-a main body; 2432-weld zone; 244-a transition; 245-a terminal connection portion; 25-tab insulating glue; 26-a pressure relief mechanism; 27-code blue glue.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope 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 in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase 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.

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

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

The appearances of "a plurality" in this application are intended to mean more than two (including two).

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The rechargeable battery has high energy density, high power density, high cycle frequency, long storage time and other advantages, and is widely used in electric vehicles, mobile devices and electric tools. With the continuous development of battery technology, higher requirements are also put on the quality and service life of the battery.

The inventor finds that in the production and assembly process of the battery, the tab of the electrode assembly is usually welded on the connecting piece first, overcurrent and confluence are realized through the connecting piece, and then the tab is connected on the cover body or the electrode terminal of the shell through the connecting piece, the thickness of the connecting piece is small, when the connecting piece is welded on the tab, the connecting piece and the tab flattening area are easy to weld through, the isolating membrane is scalded, and after the isolating membrane of the electrode assembly is scalded, the battery monomer can generate large self-discharge to cause the problem of low voltage, so that the service life and the service performance of the battery monomer are influenced.

In view of the above, the inventors have conducted intensive studies to design a battery cell in order to solve the problem of the battery life being affected by damage to an electrode assembly during the assembly of the battery, the connecting piece is provided with a heat dissipation part which is used for increasing the heat dissipation area of the connecting piece, when the connecting piece is welded on the electrode lugs of the electrode assembly, the heat dissipation part can effectively disperse the heat generated by welding, effectively relieve the problems that the welding heat is excessively accumulated at the local part of the connecting piece to weld through the connecting piece and the lug flattening area and scald the isolating membrane of the electrode assembly, thereby protecting the electrode assembly to a certain extent, effectively reducing the phenomenon that the electrode assembly is damaged when the connecting piece is welded on the electrode assembly, therefore, the problems of self-discharge and low voltage of the battery monomer caused by scalding of the isolating membrane of the electrode assembly are reduced, the service life of the battery monomer is effectively prolonged, and the service performance of the battery monomer is improved.

The battery cell disclosed in the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but not limited thereto. The power supply system with the electric device formed by the battery monomer, the battery and the like disclosed by the application can be used, so that the service life and the use performance of the battery can be effectively prolonged.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments take an example in which a power consuming apparatus according to an embodiment of the present application is a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

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

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 20 may be multiple, and the multiple battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 20 may be cylindrical, flat, rectangular parallelepiped, or other shape. Illustratively, in fig. 2, the battery cell 20 is cylindrical.

According to some embodiments of the present disclosure, referring to fig. 3 and 4, fig. 3 is an exploded view of a structure of a battery cell 20 provided in some embodiments of the present disclosure, and fig. 4 is an exploded view of a structure of a connection member 24 provided in some embodiments of the present disclosure. The present application provides a battery cell 20, the battery cell 20 including a case 21, an electrode terminal 22, an electrode assembly 23, and a connection member 24. The electrode terminal 22 is provided in the case 21. The electrode assembly 23 is disposed in the case 21, and the electrode assembly 23 has tabs 231. The connector 24 includes a body for electrically connecting the tab 231 and the electrode terminal 22, and a heat dissipation part 241 connected to the body for increasing a heat dissipation area of the connector 24.

Optionally, the housing 21 may also be used to contain an electrolyte, such as an electrolyte. The housing 21 may take a variety of configurations. The material of the housing 21 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

In some embodiments, the case 21 may include a case body 211 and a cover body 212, the case body 211 having a hollow structure with one side opened, the cover body 212 covering the opening of the case body 211 and forming a sealing connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte, and the electrode terminal 22 being mounted to the cover body 212 in an insulated manner.

When assembling the battery cell 20, the electrode assembly 23 is first placed in the case 211, the electrolyte is filled in the case 211, and the lid 212 is then fitted to the opening of the case 211.

The housing 211 may be various shapes such as a cylinder, a rectangular parallelepiped, etc. The shape of the case 211 may be determined according to the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 is of a cylindrical structure, it may be optionally used as the cylindrical case 211; if the electrode assembly 23 has a rectangular parallelepiped structure, a rectangular parallelepiped case 211 may be used. Of course, the cover 212 may have various structures, for example, the cover 212 has a plate-like structure, a hollow structure with one end open, and the like. Illustratively, in the figures, the electrode assembly 23 is a cylindrical structure, and the case 211 is a cylindrical case 211.

It is understood that the case 21 is not limited to the above structure, and the case 21 may have other structures, for example, the case 21 includes a case body 211 and two cover bodies 212, the case body 211 has a hollow structure with two opposite openings, and one cover body 212 is correspondingly covered on one opening of the case body 211 and is hermetically connected to form a sealed space for accommodating the electrode assembly 23 and the electrolyte. In this structure, the electrode terminal 22 is mounted on one of the covers 212 in an insulated manner.

The structure of the case 21 including the case 211 and the two covers 212 is also applicable to the battery cells 20 having the electrode terminals 22 disposed at both ends of the electrode assembly 23, and the electrode terminals 22 at both ends of the battery cells 20 are respectively mounted on the two covers 212 in an insulated manner.

It should be noted that the electrode terminal 22 is mounted on the housing 21 in an insulated manner, that is, the electrode terminal 22 is connected to the housing 21, but the electrode terminal 22 is connected to the housing 21 in an insulated manner, that is, no electrical conduction is formed between the electrode terminal 22 and the housing 21. For example, referring to fig. 3 and 4, the electrode terminal 22 is riveted to the cover 212, and an upper plastic and a lower plastic may be further disposed on the cover 212 to separate the electrode terminal 22 from the cover 212, so as to achieve the insulating mounting of the electrode terminal 22 on the cover 212.

The electrode assembly 23 is a part in which electrochemical reactions occur in the battery cell 20. The electrode assembly 23 may include a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 23 may have a winding structure formed by winding a positive electrode tab, a separator, and a negative electrode tab, or a stacked structure formed by stacking a positive electrode tab, a separator, and a negative electrode tab. Illustratively, in fig. 3, the electrode assembly 23 is a wound structure formed by winding a positive electrode tab, a separator, and a negative electrode tab.

Optionally, the battery cell 20 may further include a first insulator for being disposed outside the tab 231 and the connection member 24 to isolate the case 211 of the case 21 from the tab 231 and the connection member 24, thereby achieving electrical insulation of the case 211 of the case 21 from the tab 231 and the connection member 24.

Illustratively, the first insulator is tab insulator 25.

Optionally, the battery cell 20 may further include a second insulating member for being disposed between the outer circumference of the electrode assembly 23 and the case 21 to isolate the case 211 of the case 21 from the electrode assembly 23, thereby achieving electrical insulation of the case 211 of the case 21 from the electrode assembly 23. Illustratively, the second insulator is a blue-engraved glue 27.

The connecting member 24 serves to perform overcurrent and current collection, the electrode terminal 22 is electrically connected to the tab 231 of the electrode assembly 23 through the connecting member 24, the electrode terminal 22 is used to output the current of the electrode assembly 23, wherein the connecting member 24 is connected to the tab 231 by welding, and the connecting member 24 is connected to the tab 231 by ultrasonic welding or laser welding.

The battery cell 20 may further include a pressure relief mechanism 26, with the pressure relief mechanisms 26 each mounted to the cover 212. The pressure relief mechanism 26 is used to relieve the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

For example, the pressure relief mechanism 26 may be a component such as an explosion-proof valve, an explosion-proof plate, a gas valve, a pressure relief valve, or a safety valve.

In the battery cell 20 with the structure, the connecting member 24 is provided with the heat dissipation part 241, the heat dissipation part 241 effectively increases the heat dissipation area of the connecting member 24, when the connecting member 24 is welded to the tab 231 of the electrode assembly 23, the heat dissipation part 241 can accelerate the heat generated by scattered welding, the problem that the welding heat is locally and excessively accumulated in the connecting member 24 to weld through the connecting member 24 and a tab flattening area and scald an isolation film of the electrode assembly 23 is effectively solved, a certain protection effect is achieved on the electrode assembly 23, the problems of self-discharge and low voltage of the battery cell 20 caused by the fact that the isolation film of the electrode assembly 23 is scalded are reduced, the service life of the battery cell 20 is effectively prolonged, and the service performance of the battery cell 20 is improved.

In some embodiments, the electrode assembly 23 has a central hole 232, and the heat dissipation part 241 is inserted into the central hole 232.

Wherein the electrode assembly 23 has a central hole 232, that is, the electrode assembly 23 may be a wound structure, the positive electrode tab, the negative electrode tab and the separation film are wound to form the electrode assembly 23, and the center of the wound electrode assembly 23 has the central hole 232, and in fig. 3, the electrode assembly 23 is exemplarily a wound cylindrical structure, and the central hole 232 is located at the center of the cylindrical structure.

It can be understood that, when the connecting member 24 is disposed at only one end of the battery cell 20, as shown in fig. 5, fig. 5 is a cross-sectional view of the battery cell provided in some embodiments of the present application, the extension length of the heat dissipation part 241 of the connecting member 24 in the central hole 232 of the electrode assembly 23 should be less than the height of the electrode assembly 23 after the flat tab is formed, so as to prevent the heat dissipation part 241 from directly connecting the two poles of the battery cell 20; correspondingly, when the connecting members 24 are disposed at both ends of the battery cell 20, as shown in fig. 6, fig. 6 is a cross-sectional view of the battery cell provided in some embodiments of the present application, after the heat dissipation portions 241 of the two connecting members 24 are inserted into the central hole 232 of the electrode assembly 23, one ends of the two heat dissipation portions 241, which are far away from the body, are not overlapped, that is, a gap is formed between the ends of the two heat dissipation portions 241, which are far away from the body, to prevent the two heat dissipation portions 241 from being overlapped to directly connect the two poles of the battery cell 20.

The heat dissipating part 241 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like. Illustratively, in the figure, the heat dissipation portion 241 is a cylinder.

The heat dissipation member 241 may be made of a heat conductive metal or a heat conductive insulator having a good heat conductivity and not affecting the electrochemical reaction of the battery cell 20.

Optionally, the outer diameter of the heat dissipation portion 241 accounts for 98% to 100% of the inner diameter of the central hole 232 of the electrode assembly 23, and such a design enables the outer diameter of the heat dissipation portion 241 to be close to the inner diameter of the central hole 232, so that the heat dissipation portion 241 can be inserted into the central hole 232, and at the same time, the heat dissipation portion 241 can better support the central hole 232, and the deformation amount of the central hole 232 is reduced as much as possible.

The heat dissipation part 241 is inserted into the central hole 232 of the electrode assembly 23, on one hand, the heat dissipation part 241 has heat conduction and heat dissipation functions, and welding heat of the connecting piece 24 is quickly led into the central hole 232 of the electrode assembly 23 through the heat dissipation part 241 and is dispersed; on the other hand, the heat dissipation part 241 extends into the central hole 232 of the electrode assembly 23 to support the central hole 232 of the electrode assembly 23 to a certain extent, so that the problem of collapse of the central hole 232 of the electrode assembly 23 can be effectively relieved, and the risk of lithium precipitation caused by collapse of the central hole 232 of the electrode assembly 23 is effectively reduced; moreover, the heat dissipation part 241 is inserted into the central hole 232 of the electrode assembly 23, so that the flattened tabs 231 can be effectively prevented from blocking the central hole 232 of the electrode assembly 23, and the smoothness of the gas of the battery cell 20 is improved, therefore, the stability of the electrode assembly 23 is further improved by the design that the heat dissipation part 241 is inserted into the central hole 232 of the electrode assembly 23, and the heat dissipation part 241 has a heat conduction and heat dissipation function and an electrode assembly 23 supporting function, and is compact in structure and high in functional integrity.

In some embodiments, the heat dissipating unit 241 is a heat dissipating tube 2411, and one end of the heat dissipating tube 2411 is connected to the body.

The heat dissipating tube 2411 is a hollow structure with two open ends and a certain extending length, and the heat dissipating tube 2411 may be a circular tube, a flat tube or a tube body with other shapes. For example, in fig. 4, the radiating pipe 2411 is a circular pipe.

Alternatively, the wall thickness of the heat dissipation tube 2411 may be less than 1mm to achieve the purpose of enhancing the heat dissipation effect of the connection element 24 while minimizing the material cost.

Radiating part 241 adopts cooling tube 2411, on the one hand, cooling tube 2411 heat radiating area is big, can heat conduction and dispersion heat fast, and be convenient for carry out the heat exchange fast with medium on every side, improve connecting piece 24's radiating efficiency, on the other hand, cooling tube 2411 inserts centre bore 232, the volume that has maxmized to centre bore 232 when playing the supporting role to centre bore 232 compares, and cooling tube 2411's inner chamber can form gas passage, so that the inside gaseous inner chamber through cooling tube 2411 that forms of battery monomer 20 discharges.

In some embodiments, the body is provided with a first through hole 242, and the first through hole 242 is communicated with the inner cavity of the heat dissipation tube 2411.

The first through-hole 242 may be a circular hole, an elliptical hole, or another shaped through-hole. For example, in fig. 4, the first through hole 242 is a circular hole, and the first through hole 242 penetrates through the body and is communicated with the inner cavity of the heat dissipation tube 2411.

The body is provided with a first through hole 242 communicated with the inner cavity of the heat dissipating tube 2411, the first through hole 242 and the inner cavity of the heat dissipating tube 2411 cooperate to form a gas passage, and gas generated in the battery cell 20 can enter the heat dissipating tube 2411 from the end of the heat dissipating tube 2411 and be discharged through the first through hole 242.

In some embodiments, the wall of the heat pipe 2411 is provided with a second through hole 2412.

Likewise, the second through hole 2412 may be a circular hole, an elliptical hole, or a through hole of other shapes. Illustratively, in fig. 4, the second through hole 2412 is a circular hole.

In order to further improve the air inlet area of the heat pipe 2411 and the uniformity and exhaust efficiency of air discharged from various parts in the electrode assembly 23, a plurality of second through holes 2412 may be formed on the pipe wall of the heat pipe 2411, and the second through holes 2412 may be strip-shaped holes extending in the axial direction of the heat pipe 2411, spiral holes spiraling around the outer wall of the heat pipe 2411, or the like.

The second through hole 2412 can be used as an air inlet hole, air generated inside the battery cell 20 can enter the radiating pipe 2411 through the second through hole 2412 and be discharged through the first through hole 242, and the arrangement of the second through hole 2412 effectively improves the smoothness and other discharge efficiency of air discharge.

Optionally, a plurality of rows of second through holes 2412 are formed in the tube wall of the heat radiating tube 2411, each row of second through holes 2412 includes a plurality of second through holes 2412 distributed at intervals in the axial direction of the heat radiating tube 2411, and the plurality of rows of second through holes 2412 are distributed at intervals in the circumferential direction of the heat radiating tube 2411.

For example, 3 rows of second through holes 2412 may be drilled in the wall of the heat dissipation pipe 2411, and the diameter of the second through holes 2412 may be 0.5-2 mm.

The multiple columns of second through holes 2412 are formed in the pipe wall of the radiating pipe 2411 and distributed at intervals along the circumferential direction of the radiating pipe 2411, each column of second through holes 2412 comprises multiple second through holes 2412 distributed at intervals along the axial direction of the radiating pipe 2411, the design enables the pipe wall of the radiating pipe 2411 to form a multi-angle gas inlet surface and effectively increase the total area of the gas inlet surface, and the gas generated in the single battery 20 is convenient to approach and is discharged after rapidly entering the radiating pipe 2411 through the different second through holes 2412, so that the smoothness and uniformity of the gas discharge in the single battery 20 are further improved.

Optionally, the second through holes 2412 of two adjacent columns are arranged in a staggered manner.

Each row of the second through holes 2412 includes a plurality of second through holes 2412 distributed at intervals along the axial direction of the radiating pipe 2411, and two adjacent rows of the second through holes 2412 are arranged in a staggered manner, i.e. the two adjacent rows of the second through holes 2412 are located at different radial sections of the radiating pipe 2411.

Such design plays the guard action to the structural strength of cooling tube 2411 itself, has effectively protected the resistance deformation nature of cooling tube 2411 when increasing the cooling tube 2411 area of admitting air.

In some embodiments, the inner surface of the heat dissipating tube 2411 is provided with a gas adsorbing material for adsorbing gas generated inside the battery cell 20.

The gas adsorption material may be coated on the inner surface of the heat dissipation pipe 2411 by coating or spraying, and in order to ensure the adhesion stability of the gas adsorption material coated on the inner surface of the heat dissipation pipe 2411, the gas adsorption material may be mixed with an adhesive, and the gas adsorption material may be stably adhered to the heat dissipation pipe 2411 by the adhesive.

For example, the bulk adsorbent material and CMC (carboxymethyl cellulose) and SBR (polystyrene butadiene copolymer) may be formed into a slurry, which may be 9:0.5:0.5, and the slurry with the CMC and SBR added may be stably adhered to the wall of the radiating pipe 2411, wherein the gas adsorbent material may be a covalent organic framework, a metal organic framework material.

In other embodiments, the outer wall of the heat dissipation tube 2411 may also be provided with a gas adsorbing material.

The cooling tube 2411 is provided with a gas adsorbing material, and the gas adsorbing material can absorb the gas entering the inner cavity of the cooling tube 2411 so as to reduce the amount of gas inside the single battery 20, further reduce the internal pressure of the single battery 20 and improve the safety of the whole life cycle of the single battery 20.

In still other embodiments, referring to fig. 7, fig. 7 is a schematic structural view of a connecting member 24 according to still other embodiments of the present application, in which the heat dissipation portion 241 is a heat dissipation fin 2413, one end of the heat dissipation fin 2413 is connected to the body, and the other end is a free end.

The heat dissipating fin 2413 is a plate-like structure having a good heat conductive property. The heat sink 2413 may be made of a heat conductive insulator having good heat conductivity and not affecting the electrochemical reaction of the battery cell 20, or a heat conductive metal having the same material as the body.

The heat radiating fins 2413 are connected to the body to directly increase the heat radiating area of the body, and the welding heat generated when the connecting member 24 is welded to the tab 231 through the heat radiating fins 2413 is quickly dispersed, so that the problem that the welding heat is locally excessively accumulated on the connecting member 24 to weld through the connecting member 24 and the tab flattening area and scald the isolating membrane of the electrode assembly 23 is solved.

In some embodiments 2413 crease between the fin and the body.

The crease may be a linear trace of a thin thickness formed at the connection between the heat sink 2413 and the body, or a plurality of through holes may be formed at intervals along the folding trajectory at the connection between the heat sink 2413 and the body to form a connection weak region between the heat sink 2413 and the body, so that the heat sink 2413 can be conveniently folded along the linear trace of a thin thickness or the connection weak region formed by connecting a plurality of through holes.

The fold makes the fins 2413 foldable along the fold, and the folded fins 2413 can effectively reduce the space occupancy rate, thereby facilitating the assembly of the connecting member 24.

For example, in fig. 7, the heat sink 2413 is connected to the outer edge of the body, the fold is located between the outer edge of the body and the heat sink 2413, and the heat sink 2413 abuts against the side of the body away from the tab 231 after being folded along the fold.

Folds are formed between the radiating fins 2413 and the body, and in the subsequent assembling process, the radiating fins 2413 can be folded from the folds and abut against the body, so that the space occupancy rate of the radiating fins 2413 is effectively reduced.

In some embodiments, the body includes a terminal connection portion 245, a tab connection portion 243, and a transition portion 244, the terminal connection portion 245 being for connecting the electrode terminal 22, the tab connection portion 243 being for connecting the tab 231, the transition portion 244 being for connecting the terminal connection portion 245 and the tab connection portion 243, the heat dissipation portion 241 being connected to the tab connection portion 243.

For example, referring again to fig. 4, the terminal connection part 245 and the electrode terminal 22 are connected by a rivet. The tab connecting part 243 may include a main body 2431 having a welding region 2432 recessed from a side of the main body 2431 remote from the tab 231 to a side facing the tab 231, a heat radiating part 241 coupled to the main body 2431, and a first through hole 242 provided in the main body 2431. The transition portion 244 and the terminal connection portion 245 and the transition portion 244 and the tab connection portion 243 have creases therebetween.

After the battery cells 20 are assembled, the transition portion 244 is bent with respect to the terminal connection portion 245 and the transition portion 244 is bent with respect to the tab connection portion 243, and the transition portion 244 is folded between the tab connection portion 243 and the terminal connection portion 245. The provision of the transition portion 244 between the tab connection portion 243 and the terminal connection portion 245 facilitates assembly, and the provision of the transition portion 244 facilitates reduction of the possibility of the tab connection portion 243 and the electrode assembly 23 being disconnected due to movement of the terminal connection portion 245 relative to the electrode assembly 23.

In some embodiments, the material of the heat dissipation portion 241 is the same as the material of the body.

The connecting member 24 connects the tab 231 and the electrode terminal 22 at a point, and the material of the body thereof is generally metal and corresponds to both poles of the battery 100.

For example, the connector 24 of the positive electrode of the battery cell 20 may be made of aluminum, the heat dissipation portion 241 of the connector 24 of the positive electrode of the battery 100 assembly may be made of aluminum, the connector 24 of the negative electrode of the battery cell 20 may be made of copper, and the heat dissipation portion 241 of the connector 24 of the negative electrode of the battery 100 assembly may be made of copper.

The heat dissipation part 241 is made of the same material as the body, so that the heat dissipation part 241 and the body can be welded or integrally formed conveniently, and the heat dissipation performance of the connecting piece 24 is ensured.

According to some embodiments of the present application, the present application further provides a battery 100, which includes a case 10 and the battery cell 20 of any of the above aspects, wherein the battery cell 20 is configured to be accommodated in the case 10.

According to some embodiments of the present application, the present application further provides an electric device, including the battery 100 of any of the above aspects, and the battery 100 is used for providing electric energy for the electric device.

The powered device may be any of the aforementioned devices or systems that employ battery 100.

According to some embodiments of the present application, referring to fig. 3 to 6, the present application provides a battery cell 20, the battery cell 20 including a case 21, an electrode terminal 22, an electrode assembly 23, and a connection member 24, the electrode terminal 22 being disposed in the case 21, the electrode assembly 23 having tabs 231. The connector 24 includes a body for electrically connecting the tab 231 and the electrode terminal 22, and a heat dissipation part 241 connected to the body for increasing a heat dissipation area of the connector 24. Specifically, the housing 21 includes a case 211, a first cover 212a and a second cover 212b, the case 211 is a hollow structure with openings at two opposite sides, the first cover 212a and the second cover 212b are correspondingly covered on the two openings of the case 211, the first cover 212a is mounted with the first electrode terminal 22a in an insulated manner, and the second cover 212b is mounted with the second electrode terminal 22b in an insulated manner. The electrode assembly 23 is disposed in the case 211, and one end of the electrode assembly 23 adjacent to the first electrode terminal 22a has a first tab 231a, and one end of the electrode assembly 23 adjacent to the second electrode terminal 22b has a second tab 231 b. A first connecting piece 24a is arranged between the first tab 231a and the first electrode terminal 22a, a second connecting piece 24b is arranged between the second tab 231b and the second electrode terminal 22b, the first connecting piece 24a comprises a first body and a first heat dissipation part 241a, the second connecting piece 24b comprises a second body and a second heat dissipation part 241b, the first body and the second body respectively comprise a terminal connecting part 245, a tab connecting part 243 and a transition part 244, the terminal connecting part 245 is used for connecting the electrode terminals 22, the tab connecting part 243 is used for connecting the tabs 231, the transition part 244 is used for connecting the terminal connecting part 245 and the tab connecting part 243, the first heat dissipation part 241a is connected to the tab connecting part 243 of the first body, and the second heat dissipation part 241b is connected to the tab connecting part 243 of the second body. The electrode assembly 23 has a center hole 232, and the first and second heat sink pieces 241a and 241b are inserted into the center hole 232.

The first heat dissipation part 241a and the first body are made of the same material, the second heat dissipation part 241b and the second body are made of the same material, and a gap is formed between one end of the first heat dissipation part 241a, which is far away from the first body, and one end of the second heat dissipation part 241b, which is far away from the second body.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (14)

1. A battery cell, comprising:

a housing;

an electrode terminal provided to the case;

an electrode assembly disposed within the case, the electrode assembly having tabs;

the connecting piece comprises a body and a heat dissipation part, wherein the body is used for electrically connecting the electrode lug and the electrode terminal, the heat dissipation part is connected to the body, and the heat dissipation part is used for increasing the heat dissipation area of the connecting piece.

2. The battery cell according to claim 1, wherein the electrode assembly has a center hole into which the heat dissipation part is inserted.

3. The battery cell as claimed in claim 2, wherein the heat dissipating part is a heat dissipating pipe, and one end of the heat dissipating pipe is connected to the body.

4. The battery cell as claimed in claim 3, wherein the body is provided with a first through hole, and the first through hole is communicated with the inner cavity of the heat dissipation pipe.

5. The battery cell as claimed in claim 3, wherein the pipe wall of the heat dissipation pipe is provided with a second through hole.

6. The battery cell as claimed in claim 5, wherein a plurality of rows of the second through holes are disposed on the tube wall of the heat dissipation tube, each row of the second through holes includes a plurality of second through holes spaced along the axial direction of the heat dissipation tube, and the plurality of rows of the second through holes are spaced along the circumferential direction of the heat dissipation tube.

7. The battery cell as claimed in claim 6, wherein the second through holes in two adjacent columns are arranged in a staggered manner.

8. The battery cell as claimed in claim 3, wherein the inner surface of the heat dissipation pipe is provided with a gas adsorption material for adsorbing gas generated inside the battery cell.

9. The battery cell as recited in claim 1 wherein the heat dissipating portion is a heat sink having one end attached to the body and the other end being a free end.

10. The battery cell as recited in claim 9 wherein the heat sink has a fold with the body.

11. The battery cell according to any one of claims 1 to 10, wherein the body comprises a terminal connection part for connecting the electrode terminal, a tab connection part for connecting the tab, and a transition part for connecting the terminal connection part and the tab connection part, and the heat dissipation part is connected to the tab connection part.

12. The battery cell according to any one of claims 1 to 10, wherein the heat dissipation part is made of the same material as the body.

13. A battery comprising the battery cell of any one of claims 1 to 12.

14. An electrical device comprising the battery of claim 13, wherein the battery is configured to provide electrical energy.

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