CN115548600A

CN115548600A - Battery monomer, battery and consumer

Info

Publication number: CN115548600A
Application number: CN202110748345.5A
Authority: CN
Inventors: 肖海河; 张小文; 周锡根
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2022-12-30
Anticipated expiration: 2041-06-30
Also published as: CN115548600B

Abstract

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment. The battery cell includes an electrode terminal including: a first section; a second section; a fusing part for electrically connecting the first segment and the second segment through the fusing part; a conductive portion for electrically connecting the first segment and the second segment via the conductive portion; wherein the melting point of the fusing part is less than the melting point of the conductive part, and when the current passing through the electrode terminal exceeds a threshold value, the fusing part fuses, and the conductive part maintains the electrical connection of the first section part and the second section part; the current passing through the electrode terminal after the fusing part is fused is less than a threshold value. The application provides a battery monomer can be when the electric current increase of battery monomer place circuit, in time adjusts the free resistance of battery to reduce this electric current, reduce battery and consumer and take place the probability of overcurrent damage, and make battery monomer provide certain power for the consumer and in order to carry out the processing action after the trouble, further improve the security of consumer.

Description

Battery monomer, battery and consumer

Technical Field

The application relates to the technical field of batteries, in particular to a single battery, a battery and electric equipment.

Background

With the development of society and the enhancement of environmental awareness, more and more electric devices select power batteries, especially large-capacity power batteries, as power sources.

Although a large-capacity power battery can provide enough energy for electric equipment, the safety performance of the power battery cannot be satisfactorily solved due to the use of high-energy chemicals, energy concentration and the like. In the use process, the current of the battery is increased instantly due to the fact that the positive electrode and the negative electrode of the battery are overlapped by mistake or the battery is short-circuited inside the battery, and therefore electric equipment is damaged.

Therefore, how to improve the use safety of batteries and electric devices is an urgent problem to be solved in the field.

Disclosure of Invention

In view of the above problems, embodiments of the present application provide a battery cell, a battery, and an electrical device, which can adjust the resistance of the battery cell in time when the current of the circuit in which the battery cell is located increases, so as to reduce the current, reduce the probability of overcurrent damage of the battery and the electrical device, and enable the battery cell to provide a certain power for the electrical device to perform a handling operation after a fault.

According to an aspect of an embodiment of the present application, there is provided a battery cell, including a case, an electrode assembly, and an end cap, where the case is provided with an opening, the electrode assembly is placed in the case, the end cap is used to cover the opening, and an electrode terminal is further provided on the end cap, and the electrode terminal includes a first section and a second section; the electrode terminal also comprises a fusing part and a conductive part, wherein the fusing part and the conductive part are respectively used for electrically connecting the first section part and the second section part;

wherein the melting point of the fusing part is less than the melting point of the conductive part, and when the current passing through the electrode terminal exceeds a threshold value, the fusing part fuses, and the conductive part maintains the electrical connection of the first section part and the second section part; the current passing through the electrode terminal after the fusing part is fused is less than a threshold value.

By adopting the scheme, the single battery is connected into the circuit through the electrode terminal, and when the current passing through the electrode terminal is smaller than the threshold value, the fusing part and the conductive part are respectively and simultaneously electrically connected with the first section part and the second section part so as to ensure that the single battery is normally connected into the circuit; when the free electric current that passes through the battery exceeded the threshold value, each electrical connection part of electrode terminal can produce heat fast, when the heat is greater than the melting point of certain part, this part can melt and break off, because the melting point of fusing portion is less than the melting point of conductive part, consequently when the electric current that passes through electrode terminal is greater than the threshold value, fusing portion can be preferred to be fused, after fusing portion fuses, only through the conductive part electricity connection between first section portion and the second section portion, the electric current that passes through electrode terminal this moment can reduce below the threshold value, can protect the free circuit at battery and its place, reduce the free probability that takes place overcurrent damage with the consumer of battery, improve the free safety in utilization of battery. In addition, because the electric conduction part continuously keeps the electric connection of first section and second section, consequently, consumer can also keep certain power after the disconnection of fusing portion to make things convenient for the user to take corresponding action to consumer, for example, the side by side parking etc. thereby convenience of customers uses, and further improve the security performance of equipment.

In some embodiments, the fuse portion and the conductive portion are located between the first section and the second section, and each of the fuse portion and the conductive portion has one end connected to the first section and the other end connected to the second section, so as to electrically connect the first section and the second section, respectively.

By adopting the scheme, when the current passing through the electrode terminal is smaller than the threshold value, the fusing part and the conductive part are connected in parallel between the first section part and the second section part so as to enable the first section part and the second section part to be electrically connected, so that the resistance of the electrode terminal is smaller, the current passing through the electrode terminal is larger, and the electric equipment has larger power so as to execute more actions; when the fusing part is fused, the resistance of the electrode terminal is increased so that the current passing through the electrode terminal is reduced compared with that before the fusing part is fused, and the single battery can provide less power for the electric equipment to finish the handling action after the fusing.

In some embodiments, the conductive portion is configured to be disposed around the fuse portion for supporting the first segment or the second segment after the fuse portion is melted.

By adopting the scheme, after the fusing part is fused, the supporting capacity for the first section part and the second section part is lost, if the fusing part is not supported, the first section part approaches to the second section part, or the second section part approaches to the first section part, the assembly structure of the electrode terminal is damaged, meanwhile, the fused fusing part can also enable the first section part and the second section part to be electrified again, so that the circuit is in an unsafe high-current environment again, and the conductive part surrounds the fusing part, so that after the fusing part is fused, the conductive part can be supported between the first section part and the second section part, the first section part and the second section part are prevented from approaching to each other, and the circuit is prevented from being in the unsafe high-current environment again.

In some embodiments, the conductive portion includes a plurality of conductive pillars, and two adjacent conductive pillars are arranged at intervals along a circumferential direction of the fuse portion, so that the fuse portion is discharged from a gap between the two adjacent conductive pillars after being melted.

Through adopting above-mentioned scheme, the fusing part softens after melting, has the mobility, flows the back through the clearance between leading electrical pillar when the fusing part for break off between fusing part and first section portion or the second section portion, thereby make no longer through fusing part electricity connection between first section portion and the second section portion.

In some embodiments, the conductive portion comprises a conductive ring disposed around the fuse portion.

Through adopting above-mentioned scheme, the conducting ring can be supported between first section portion and second section portion at whole circle after fusing of fusing portion, prevents that first section portion and second section portion are close to each other.

In some embodiments, a space is provided between the fusing part and the conductive ring, and the fusing part at least partially enters the space after being melted.

Through adopting above-mentioned scheme, get into the interval space after fusing portion melts to soften to with first section portion or second section portion between break off, thereby make no longer through fusing portion electricity connection between first section portion and the second section portion.

In some embodiments, the fuse portion is configured to be disposed around the conductive portion.

By adopting the scheme, after the fusing part is melted, the fusing part can flow around the conductive part to be disconnected with the first section part or the second section part; the conductive portion supports the first segment and the second segment at the middle portion, maintains electrical connection between the first segment and the second segment, and supports the first segment and the second segment.

In some embodiments, the fusing part has a melting point lower than those of the first and second segments, so that the fusing part fuses earlier than the first and second segments when a current passing through the electrode terminal exceeds a threshold value.

By adopting the above scheme, when the current passing through the electrode terminal exceeds the threshold value, if the first section and the second section are fused, although the current passing through the battery cell can be completely cut off, the effect of protecting the battery and the electric equipment is achieved, the electric equipment cannot take the handling action, which may cause the problem similar to that a vehicle stops at a position where the vehicle does not stop, or the equipment is in a dangerous state, and by making the melting point of the fusing part lower than the melting points of the first section and the second section, when the current passing through the electrode terminal exceeds the threshold value, the fusing part is fused instead of fusing the first section and the second section, and at the moment, the first section and the second section are communicated through the conductive part, so that the current passing through the electrode terminal is small, and the battery cell can still provide power for the electric equipment to perform the handling action.

In some embodiments, the conductive portion is the same material as the first section and/or the conductive portion is the same material as the second section.

By adopting the scheme, the conductive part can be integrally formed with the first section part or the second section part, so that the manufacturing cost is reduced.

According to a second aspect of embodiments of the present application, there is provided a battery including a plurality of battery cells of the above embodiments.

Through adopting above-mentioned scheme, a plurality of battery monomer all can be when the electric current of its place circuit increases, through the disconnection of fusing portion to protection battery and consumer prevent its overcurrent damage, and for the consumer provides power so that it carries out the action of handling, prevent that the consumer from stopping under dangerous state. According to a third aspect of embodiments of the present application, there is provided an electric device including the battery in the above embodiments.

By adopting the above scheme, the safety of the electric equipment is higher, and when the battery of the electric equipment is short-circuited, the current of the battery can quickly return to the safety range, and power is provided for the electric equipment within the safety range, so that the electric equipment can take treatment action, and the safety of the electric equipment is further improved.

This application embodiment is used for the fusing part and the conductive part of the first section portion and the second section portion of electric connection electrode terminal respectively through setting up to make the fusing point of fusing part be less than the fusing point of conductive part, after fusing part fusing, make and be connected between first section portion and the second section portion through the conductive part, and the control current through electrode terminal does not exceed the threshold value, when having ensured the security, make the consumer can have certain power in order to take and deal with the action, the safety in utilization of consumer has further been improved.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and in order that the technical means of the embodiments of the present application can be clearly understood, the embodiments of the present application are specifically described below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electric device in an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a battery module according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a battery cell according to an embodiment of the present application.

FIG. 5 is a schematic cross-sectional view of the end cap assembly of FIG. 4.

Fig. 6 is a schematic structural diagram of an electrode terminal in a first state according to an embodiment of the present disclosure.

Fig. 7 is a schematic structural diagram of an electrode terminal in a second state according to an embodiment of the present application.

Fig. 8 is a perspective view of an electrode terminal according to another embodiment of the present application.

Fig. 9 is a schematic cross-sectional view of section B-B in fig. 8.

Fig. 10 is a perspective view of an electrode terminal according to still another embodiment of the present application.

Fig. 11 is a schematic cross-sectional view of section C-C in fig. 10.

Fig. 12 is a sectional view of an electrode terminal according to still another embodiment of the present application.

Reference numerals are as follows: 200. a vehicle; 210. a battery; 220. a controller; 230. a motor; 21. a box body; 211. a first tank portion; 212. a second tank portion; 22. a battery cell; 221. an electrode assembly; 222. a housing; 223. an end cap; 224. an electrode terminal; 2241. a first section; 2242. a second section; 2243. a fusing portion; 2244. a conductive portion; 23. a conductive post; 24. conducting rings; 25. a separation space; 225. a connecting member; 226. a positive electrode tab; 227. a negative electrode tab; 300. a battery module is provided.

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 and completely 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 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 this application and in the description of the figures are intended to cover, but not exclude, other things. The word "a" or "an" does not exclude the presence of a plurality.

Reference herein 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 application. The appearances of the phrase "an embodiment" 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "and/or" herein is merely an association relationship describing an associated object, and means that there may be three 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 "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The following description is given with the directional terms as they are shown in the drawings, and does not limit the specific structure of the battery cell, the battery, and the electric device of the present application. For example, in the description of the present application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus are not to be construed as limiting the present application.

Further, expressions of directions indicated for explaining the operation and configuration of each member of the battery cell, the battery, and the electric device of the present embodiment, such as the x direction, the y direction, and the z direction, are not absolute but relative, and although these indications are appropriate when each member of the battery pack is in the position shown in the drawings, when the position is changed, these directions should be interpreted differently to correspond to the change.

Furthermore, the terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, either explicitly or implicitly, including one or more of the features.

In the description of the present application, unless otherwise specified, "plurality" means two or more (including two), and similarly, "plural" means two or more (including two).

In the description of the present application, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., "connected" or "connected" of a mechanical structure may refer to a physical connection, e.g., a physical connection may be a fixed connection, e.g., a fixed connection by a fastener, such as a screw, bolt, or other fastener; the physical connection can also be a detachable connection, such as a mutual clamping or clamping connection; the physical connection may also be an integral connection, for example, a connection made by welding, gluing or integrally forming the connection. "connected" or "connected" of circuit structures may mean not only physically connected but also electrically connected or signal-connected, for example, directly connected, i.e., physically connected, or indirectly connected through at least one intervening component, as long as the circuits are in communication, or communication between the interiors of two components; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In this application, the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, and the embodiment of the present application is not limited thereto. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the single battery of cylindricality battery, square battery monomer and laminate polymer battery monomer, this application embodiment is to this also not limited.

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.

Although batteries including a plurality of battery cells can provide sufficient energy to power consumers, their safety has not been satisfactorily addressed due to the use of high-energy chemicals and energy concentration. In addition, the problem of battery life is also a key to the cost of the battery.

For example, during the use of the battery, each battery cell may have a short circuit problem, when a short circuit occurs, the current on the circuit where the battery cell is located may increase instantly, if the short circuit does not occur, the chemical substances inside the battery cell accelerate to react under the action of a large current, and a large amount of emissions are generated, so that the thermal runaway of the battery cell, even accidents such as fire and explosion, may occur. Meanwhile, different battery cells are connected in series or in parallel through circuits, so that the short circuit of one battery cell often affects other battery cells electrically connected with the battery cell, so that the problems of current increase, thermal runaway, damage and the like also occur, and the service life of the whole battery and the safety performance of electric equipment are influenced.

Although some battery monomers in the prior art are provided with a structure similar to a fuse, when the current passing through the battery monomer increases, the structure is automatically fused to disconnect the circuit connected with the battery monomer, and the battery cannot be electrified continuously, so that thermal runaway is prevented to a certain extent, the short-circuited battery monomer is prevented from damaging other battery monomers, the battery and electric equipment are protected, and the use safety of the battery and the electric equipment is improved.

However, the battery cell with the above structure cannot continue to provide kinetic energy for the electric equipment after the fuse-like structure is fused, so that the electric equipment is instantly shut down, for example, an electric vehicle may be anchored in the center of a road, and at this time, not only traffic is affected, but also rear-end collision of vehicles behind the vehicle occurs, so as to cause a serious accident.

In view of the above, the present application is intended to provide a battery cell, which can adjust the resistance of the battery cell in time when the current of the circuit where the battery cell is located increases, so as to reduce the current, reduce the probability of overcurrent damage of the battery and the electric equipment, and improve the safety of the battery and the battery cell, and in addition, can maintain a certain electric energy output of the battery cell, so as to provide a certain power for the electric equipment to perform the handling action of the electric equipment.

The battery cell described in the embodiments of the present application is suitable for a battery and an electric device using the battery.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not particularly limit the above electric devices.

For convenience of explanation, the following embodiments will be described by taking an electric device as an example of a vehicle.

Fig. 1 is a schematic structural diagram of a vehicle 200 according to some embodiments of the present disclosure. As shown in fig. 1, a battery 210 is provided inside a vehicle 200, and the battery 210 may be provided at the bottom or the head or the tail of the vehicle. The battery 210 may be used for power supply of the vehicle 200, for example, the battery 210 may serve as an operating power source of the vehicle.

The vehicle 200 may also include a controller 220 and a motor 230, the controller 220 being used to control the battery 210 to power the motor 230, for example, for start-up, navigation, and operational power requirements while traveling of the vehicle 200.

In some embodiments of the present application, the battery 210 may not only serve as an operating power source of the vehicle 200, but also serve as a driving power source of the vehicle 200, instead of or in part of fuel or natural gas to provide driving power for the vehicle 200.

Fig. 2 is an exploded view of a battery provided in some embodiments of the present application. As shown in fig. 2, the battery 210 includes a case 21 and a battery cell 22 (not shown in fig. 2), and the battery cell 22 is accommodated in the case 21.

The case 21 is used for accommodating the battery cells 22, and the case 21 may have various structures. In some embodiments, the casing 21 may include a first casing portion 211 and a second casing portion 212, the first casing portion 211 and the second casing portion 212 cover each other, and the first casing portion 211 and the second casing portion 212 together define a receiving space for receiving the battery cell 22. The second casing part 212 may be a hollow structure with one open end, the first casing part 211 is a plate-shaped structure, and the first casing part 211 covers the open side of the second casing part 212 to form the casing 21 with an accommodating space; the first tank portion 211 and the second tank portion 212 may be hollow structures with one side open, and the open side of the first tank portion 211 covers the open side of the second tank portion 212 to form the tank 21 with an accommodating space. Of course, the first tank portion 211 and the second tank portion 212 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In order to improve the sealing property after the first casing portion 211 and the second casing portion 212 are connected, a sealing member, such as a sealant or a gasket, may be provided between the first casing portion 211 and the second casing portion 212.

In the battery 210, one or more battery cells 22 may be provided. If there are a plurality of battery cells 22, the plurality of battery cells 22 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 22 are connected in series or in parallel. The plurality of battery monomers 22 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers 22 is accommodated in the box body 21; of course, a plurality of battery cells 22 may be connected in series, in parallel, or in series-parallel to form a battery module 300, and a plurality of battery modules 300 may be connected in series, in parallel, or in series-parallel to form a whole and accommodated in the box 21.

Fig. 3 is a schematic structural view of the battery module 300 shown in fig. 2. In some embodiments, as shown in fig. 3, there are a plurality of battery cells 22, and the plurality of battery cells 22 are connected in series or in parallel or in series-parallel to form a battery module 300. The plurality of battery modules 300 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case 21.

The plurality of battery cells 22 in the battery module 300 may be electrically connected to each other by a bus member, so as to realize parallel connection, series connection or parallel connection of the plurality of battery cells 22 in the battery module 300.

The bus member is a conductive member, which is respectively in contact with or connected to the plurality of battery cells 22 to realize parallel connection, series connection or parallel-series connection between the plurality of battery cells 22.

Fig. 4 is an exploded view of the battery cell 22 shown in fig. 3. As shown in fig. 4, the battery cell 22 includes an electrode assembly 221 and a case having a receiving cavity therein, the electrode assembly 221 being received in the receiving cavity of the case.

In the battery cell 22, one or more electrode assemblies 221 may be housed in the case. Illustratively, in fig. 4, there are two electrode assemblies 221.

In some embodiments, the housing chamber of the housing further contains an electrolyte.

The housing may take a variety of configurations. In some embodiments, the case includes a case body 222 and an end cap 223, the case body 222 is a hollow structure with one side opened, and the end cap 223 covers the opening of the case body 222 and forms a sealing connection to form a receiving cavity for receiving the electrode assembly 221 and the electrolyte.

The housing 222 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The shape of the case 222 may be determined according to the specific shape of the electrode assembly 221. For example, if the electrode assembly 221 is a cylindrical structure, it can be selected as a cylindrical case; if the electrode assembly 221 has a rectangular parallelepiped structure, a rectangular parallelepiped case may be used. Of course, the end cap 223 may have various structures, for example, the end cap 223 has a plate-like structure, a hollow structure with one end open, and the like. Illustratively, in fig. 4, the housing 222 is a rectangular parallelepiped structure, the end cap 223 is a plate structure, and the end cap 223 covers the opening at the top of the housing 222.

In some embodiments, the battery cell 22 further includes two electrode terminals 224 mounted on the end cap 223, the two electrode terminals 224 are respectively used for being electrically connected to the positive electrode tab 226 and the negative electrode tab 227 through the connection member 225 inside the battery cell 22 to output the electric energy generated by the electrode assembly 221, and the two electrode terminals 224 are electrically connected to the electrode terminals 224 of other battery cells 22 outside the battery cell 22 to enable electrical connection between the plurality of battery cells 22.

Fig. 5 is a sectional view of the end cap 223 of fig. 4, fig. 6 is an enlarged view of a portion a of fig. 5 in a first state, and fig. 7 is an enlarged view of a portion a of fig. 5 in a second state, and as shown in fig. 6 and 7, the electrode terminal 224 includes a first segment 2241, a second segment 2242, a fusing part 2243, and a conductive part 2244, wherein the first segment 2241 and the second segment 2242 can be electrically connected by the fusing part 2243, and the first segment 2241 and the second segment 2242 can also be electrically connected by the conductive part 2244.

The melting point of the fusing portion 2243 is lower than the melting point of the conductive portion 2244, and when the current passing through the electrode terminal 224 exceeds a threshold value, the fusing portion 2243 fuses, the conductive portion 2244 electrically connects the first segment 2241 and the second segment 2242, and the current passing through the electrode terminal 224 after the fusing portion 2243 fuses is lower than the threshold value.

The threshold is defined as an upper limit of current that allows the electric device to perform at least one operation without melting the melting portion 2243, and a minimum value of current that can be generated when the melting portion 2243 melts may be set for the electrode terminal 224 so that the electric device can perform at least one operation with the electric power supplied from the battery cell 22. When the current passing through the electrode terminal 224 exceeds the threshold, the fusing part 2243 can be fused within a certain time, for example, when the vehicle outputs a current of 20A from the battery cell 22, only a navigation action can be performed, the vehicle can perform more and more actions as the current increases, the driving speed of the vehicle can be higher, when the current is within 100A, no matter how long the electric equipment is used, the battery 210 and the electric equipment can be kept safe, the risk of thermal runaway of the battery cell 22 is small, when the current passing through the electrode terminal 224 is greater than or equal to 100A, the fusing part 2243 can be fused within 10 minutes, and then 100A is defined as the threshold of the current.

The first state shown in fig. 6 is a state before the fusing portion 2243 is fused, and the second state shown in fig. 7 is a state after the fusing portion 2243 is fused.

In the above solution, the fusing part 2243 and the conductive part 2244 may be respectively used to electrically connect the first section 2241 and the second section 2242 when the current passing through the electrode terminal 224 is smaller than the threshold value, so as to ensure that the battery cell 22 normally accesses the circuit and provide sufficient power for the circuit; when the current passing through the battery cell 22 exceeds a threshold value, each electrical connection part of the electrode terminals 224 can generate heat rapidly, when the heat is larger than the melting point of a certain part, the part can be melted and disconnected, because the melting point of the fusing part 2243 is smaller than the melting point of the conducting part 2244, when the current passing through the electrode terminals 224 is larger than the threshold value, the fusing part 2243 can be fused preferentially, after the fusing part 2243 is fused, the first section 2241 and the second section 2242 are electrically connected only through the conducting part 2244, at the moment, under the connection of the conducting part 2244, the current passing through the electrode terminals 224 is reduced to be smaller than the threshold value, the battery cell 22 and a circuit where the battery cell 22 is located are protected, the probability of overcurrent damage of the battery cell 22 and electric equipment is reduced, and the use safety of the battery cell 22 and the electric equipment is improved. In addition, after fusing portion 2243 breaks, battery 210 can last output electric energy for the consumer keeps certain power, in order to make things convenient for the user to take action to the consumer, for example, lean on the limit to park etc. thereby convenience of customers uses, and further improved the security of the consumer after fusing portion 2243 fuses.

The shapes of the first section 2241 and the second section 2242 may be arbitrarily set, and the cross-sectional shapes of the first section 2241 and the second section 2242 in the same direction may be the same or different, for example, in an embodiment, the first section 2241 and the second section 2242 are both cylindrical and coaxially set, and a certain distance is spaced between the first section 2241 and the second section 2242 for setting the fusing part 2243 and the conductive part 2244. For example, the second segment 2242 is closer to the electrode assembly 221 than the first segment 2241 in the thickness direction of the end cap 223.

In addition, the materials of the first section 2241 and the second section 2242 may be the same or different, for example, when the first section 2241 is made of aluminum, the second section 2242 may be made of aluminum, copper, an aluminum alloy, a composite material, or other conductive metals, which is not limited in this embodiment of the present application.

In some embodiments, the melting point of the fusing portion 2243 is lower than not only the melting point of the conductive portions 2244, but also the melting point of the fusing portion 2243 is lower than the melting points of the first and

second sections

2241 and 2242, so that the fusing portion 2243 fuses earlier than the first and

second sections

2241 and 2242 when the current passing through the electrode terminal 224 exceeds the threshold value. Because, when the current passing through the electrode terminal 224 exceeds the threshold value, if the first and

second sections

2241 and 2242 are fused, although the current of the battery cell 22 can be completely cut off, the effect of protecting the circuit and the battery cell 22 is achieved, but the battery cell 22 cannot continue to provide power to the electric device to take action using the electric device, which may cause problems similar to a vehicle stopping at a position where the vehicle should not stop, or the device is in a dangerous state, and by making the melting point of the fusing part 2243 lower than the melting point of the first and

second sections

2241 and 2242, when the current passing through the electrode terminal 224 exceeds the threshold value, the fusing part 2243 fuses instead of the first and

second sections

2241 and 2242, and at this time, the first and

second sections

2241 and 2242 are electrically connected through the electrode terminal 2244, so that the current passing through the electrode terminal 224 is small, the battery cell 22 can still provide power to the electric device.

In some embodiments, the fuse 2243 and the conductive portions 2244 are located between the first and

second segments

2241 and 2242, and the fuse 2243 and the conductive portions 2244 each have one end connected to the first segment 2241 and the other end connected to the second segment 2242 to make electrical connection between the first and

second segments

2241 and 2242, respectively. Since the fusing part 2243 has a different melting point from the first and

second sections

2241 and 2242, the fusing part 2243 is inevitably different from the first and

second sections

2241 and 2242, and the conductive part 2244 is made of a material which can be arbitrarily set on the condition that the melting point is higher than that of the fusing part 2243 and the resistance of the conductive part 2244 is higher than the sum of the resistances of the conductive part 2244 and the fusing part 2243.

In some embodiments, the conductive section 2244 is the same material as the first section 2241 and/or the conductive section 2244 is the same material as the second section 2242. That is, when the material of the first and

second sections

2241 and 2242 is the same, the material of the conductive section 2244 may be the same as that of the first and

second sections

2241 and 2242, and for example, when the material of the first section 2241 is aluminum and the material of the second section 2242 is aluminum, the material of the conductive section 2244 is also aluminum. When the first and

second sections

2241 and 2242 are made of different materials, the conductive part 2244 may be made of the same material as the first section 2241 or the second section 2242, for example, when the first section 2241 is made of aluminum and the second section 2242 is made of copper, the conductive part 2244 may be made of copper or aluminum.

In some embodiments, when the material of the conducting part 2244 is the same as the material of the first segment 2241 and/or the material of the conducting part 2244 is the same as the material of the second segment 2242, the conducting part 2244 may be integrally formed with one of the first segment 2241 or the second segment 2242, which is the same as the material of the conducting part 2244, thereby reducing the manufacturing cost and making the structure of the electrode terminal 224 more stable.

Of course, in other embodiments, the material of the conductive part 2244 may be different from that of the first and

second sections

2241 and 2242, in which case, the conductive part 2244 may be directly supported between the first and

second sections

2241 and 2242, and the first and

second sections

2241 and 2242 may be directly contacted to electrically connect the first and

second sections

2241 and 2242, or may be bonded or welded to the first or

second section

2241 or 2242 to ensure the stability of the electrical connection.

By adopting the above-mentioned scheme, when the current passing through the electrode terminal 224 is smaller than the threshold value, the fusing part 2243 and the conductive part 2244 are connected in parallel between the first section 2241 and the second section 2242, so that the first section 2241 and the second section 2242 are electrically connected, and thus the resistance of the electrode terminal 224 is small, so that the current passing through the electrode terminal 224 is large, and the electric device has large power; after the fusing portion 2243 is fused, the first section 2241 and the second section 2242 are electrically connected only through the conductive portion 2244, the resistance of the electrode terminal 224 is relatively high, the current passing through the electrode terminal 224 is reduced compared with the current before the fusing portion 2243 is fused, and the battery cell 22 can provide relatively low power for the electric device to complete the handling operation of the electric device in an emergency.

After the fusing part 2243 is fused, the supporting ability of the first and

second sections

2241 and 2242 is lost, so that the first section 2241 approaches the second section 2242, or the second section 2242 approaches the first section 2241, the assembly structure of the electrode terminal 224 is damaged, and the fused fusing part 2243 may re-enable the first and

second sections

2241 and 2242 to be energized, so that the circuit is again in an unsafe high-current environment. To address the above issues, in some embodiments, the conductive sections 2244 are configured to be disposed around the fuse 2243 for supporting the first or

second section

2241 or 2242 after the fuse 2243 is melted. After the fusing part 2243 is fused, the conductive part 2244 can be circumferentially supported between the first section 2241 and the second section 2242, the first section 2241 and the second section 2242 are prevented from being close to each other, a circuit is prevented from being in an unsafe high-current environment again, accordingly, the probability of damage to the single battery 22 and the electric equipment is reduced, and the use safety of the single battery 22 and the electric equipment is improved.

Fig. 8 is a perspective view of the electrode terminal 224 in an embodiment of the present application, and fig. 9 is a cross-sectional view taken along the plane B-B in fig. 8, as shown in fig. 8 and fig. 9, in some embodiments, the conductive portion 2244 includes a plurality of conductive pillars 23, two adjacent conductive pillars 23 are disposed at intervals along the circumferential direction of the fusing portion 2243, and the interval distance between different conductive pillars 23 may be the same or different, which is not limited in this embodiment. Fusing portion 2243 melts and then softens, has fluidity, and can flow out through the gap between conductive posts 23, and is disconnected from first segment 2241 or second segment 2242, so that first segment 2241 and second segment 2242 are no longer electrically connected through fusing portion 2243. This arrangement ensures that the fuse 2243 can be smoothly disconnected, thereby protecting the battery cell 22 and the electric device.

Fig. 10 is a perspective view of the electrode terminal 224 according to an embodiment of the present application, and fig. 11 is a cross-sectional view taken along the plane C-C in fig. 10, as shown in fig. 10 and 11, in some embodiments, the conductive part 2244 includes a conductive ring 24 disposed around the fuse part 2243. The conductive ring 24 can be supported between the first and

second sections

2241 and 2242 in a full circle after the fuse 2243 is fused, preventing the first and

second sections

2241 and 2242 from approaching each other, and supporting the first and

second sections

2241 and 2242 is more stable.

As shown in fig. 11, a spacing space 25 is provided between the fusing part 2243 and the conductive ring 24, and when the fusing part 2243 melts and softens, the fusing part enters the spacing space 25 and is disconnected from the first section 2241 or the second section 2242, so that the first section 2241 and the second section 2242 are no longer electrically connected through the fusing part 2243.

As shown in fig. 12, in some embodiments, the fuse 2243 is configured to be disposed around the conductive section 2244, and after the fuse 2243 melts, it may flow around the conductive section 2244 to disconnect from the first or

second sections

2241, 2242; the conductive section 2244 supports the first and

second sections

2241 and 2242 in the middle, maintains electrical connection between the first and

second sections

2241 and 2242, and supports the first and

second sections

2241 and 2242.

It should be noted that when the fusing part 2243 is disposed around the conductive part 2244, an accommodating part may be disposed on the conductive part 2244, or an accommodating part may be disposed on the first section or the second section, and the accommodating part is a groove or a hole, so that the fusing part 2243 melts and softens and then flows into the accommodating part, and the electrical connection between the first section 2241 and the second section 2242 is broken.

To sum up, this application embodiment is through setting up fuse 2243 and the electrically conductive part 2244 that are used for electrically connecting first section 2241 and second section 2242 of electrode terminal 224 respectively, and make the melting point of fuse 2243 be less than the melting point of electrically conductive part 2244, after fuse 2243 fuses, make electrically connect between first section 2241 and second section 2242 through electrically conductive part 2244, and the electric current that passes through electrode terminal 224 through electrically conductive part 2244 control is less than or equal to the threshold, when having ensured the security of battery cell 22 and consumer, make the consumer can have certain power in order to take the action of dealing with, the safety in utilization of consumer has further been improved.

The second aspect of the embodiment of the present application further provides a battery 210, which includes a plurality of battery cells 22 in the above embodiments, and when the current of the circuit where the plurality of battery cells 22 are located increases, the plurality of battery cells 22 can be disconnected by the fuse 2243, so as to protect the battery 210 and the electric device, prevent the battery from being damaged by overcurrent, and provide a certain power for the electric device to perform a disposal action.

In some embodiments, the battery 210 may include a plurality of battery cells 22, and at least two battery cells 22 may be connected in series. When a short circuit occurs in any of the battery cells 22 connected in series, the fusing part 2243 is fused, so that the current of the battery cell 22 can be controlled in time, and the circuit except the battery cell 22 is prevented from being influenced; when a circuit other than any one of the battery cells 22 is short-circuited, the fusing part 2243 of the battery cell 22 is fused, so that the current flowing through the battery cell 22 can be controlled in time, the battery cell 22 is prevented from being damaged, and the circuit where the battery 210 is located can be in an on-state to provide power for the electric equipment in a safe current range.

In a third aspect of the embodiments of the present application, an electric device is provided, which includes the battery 210 in the above embodiments.

By adopting the battery, the safety of the electric equipment is high, when the battery 210 of the electric equipment is short-circuited, the current of the battery 210 can be quickly reduced to a threshold value or below, and power is provided for the electric equipment in the range, so that the electric equipment can take treatment action, and the safety of the electric equipment is further improved.

Those of skill in the art will understand that while some embodiments herein include certain features included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present application.

Claims

1. A battery cell, comprising:

a housing provided with an opening;

an electrode assembly placed in the case;

the end cover covers the opening, and is provided with an electrode terminal;

the electrode terminal comprises a first section part and a second section part, and further comprises a fusing part and a conductive part, wherein the fusing part and the conductive part are respectively and simultaneously used for electrically connecting the first section part and the second section part;

wherein a melting point of the fusing part is smaller than a melting point of the conductive part, the fusing part fuses when a current passing through the electrode terminal is greater than a threshold value, and the conductive part maintains electrical connection of the first segment part and the second segment part; the current passing through the electrode terminal after the fusing part is fused is less than the threshold.

2. The battery cell as recited in claim 1, wherein the fusing portion and the conductive portion are located between the first section and the second section, and each of the fusing portion and the conductive portion has one end connected to the first section and the other end connected to the second section to respectively electrically connect the first section and the second section.

3. The battery cell as recited in claim 2 wherein the conductive portion is configured to be disposed around the fuse portion for supporting the first segment or the second segment after the fuse portion melts.

4. The battery cell as claimed in claim 3, wherein the conductive portion includes a plurality of conductive posts, and two adjacent conductive posts are spaced apart along a circumferential direction of the fusing portion, so that the fusing portion is melted and then discharged from a gap between two adjacent conductive posts.

5. The battery cell as recited in claim 3 wherein the conductive portion comprises a conductive ring disposed around the fuse portion.

6. The battery cell as recited in claim 5, wherein a space is provided between the fusing part and the conductive ring, and the fusing part at least partially enters the space after being melted.

7. The battery cell as recited in claim 2 wherein the fusing portion is configured to be disposed around the conductive portion.

8. The battery cell according to claim 1, wherein the fusing part has a melting point lower than those of the first and second segments, so that the fusing part fuses earlier than the first and second segments when the current passing through the electrode terminal exceeds the threshold value.

9. The battery cell according to claim 1, characterized in that the conductive portion is the same material as the first section and/or the conductive portion is the same material as the second section.

10. A battery comprising a plurality of cells according to any one of claims 1 to 9.

11. An electric device comprising the battery according to claim 10.