CN217788562U - Battery cell, battery and power consumption device - Google Patents

Abstract

The application provides a battery monomer, a battery and an electric device, wherein the battery monomer comprises a shell, the shell comprises a shell body and an end cover, and the shell body is provided with an opening; the end cover covers the opening; the pressure relief mechanism is fixedly connected to one wall of the shell; and the blocking structure is fixedly connected in the shell and is arranged at a position close to the pressure relief mechanism at an interval relative to the pressure relief mechanism. This application has the casing that blocks the structure through setting up in battery monomer, can effectively avoid electrode subassembly drunkenness when battery monomer thermal runaway to block up the condition of pressure release mechanism to greatly improved the security 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

With the development of battery technology, batteries have been widely used as important energy exchange devices in the fields of electronic devices, vehicles, and the like, and the safety of batteries is becoming a focus of attention in battery technology.

The battery is generally assembled by a plurality of battery cells, and the safety performance of the battery is directly affected by the battery cells. When the battery monomer is out of control due to heat, a large amount of gas is easily generated in the battery monomer, and the impact of airflow easily causes the electrode assembly to move in the shell to block the pressure relief mechanism, so that the out of control due to heat of the battery is further aggravated. Therefore, how to improve the safety performance of the battery is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a battery monomer, battery and power consumption device, wherein, this battery monomer's casing is provided with in the position that is close to pressure release mechanism and blocks the structure, effectively blocks the drunkenness of battery monomer thermal runaway time electrode subassembly, alleviates the problem that pressure release mechanism is blockked to promote the security performance of battery.

In a first aspect, a battery cell is provided, the battery cell comprising a housing including a case and an end cap, the case having an opening; the end cover covers the opening; the pressure relief mechanism is fixedly connected to one wall of the shell; and the blocking structure is fixedly connected in the shell, and the position close to the pressure relief mechanism is opposite to the pressure relief mechanism.

In the embodiment of the application, the corresponding blocking structure is arranged at the position, close to the pressure relief mechanism, of the shell of the single battery, on one hand, the blocking structure is arranged corresponding to the pressure relief mechanism, so that the phenomenon that the electrode assembly of the single battery moves to block the pressure relief mechanism when the thermal runaway of the battery occurs can be effectively relieved, the thermal runaway deterioration caused by the blocking of the pressure relief mechanism is relieved, and the safety of the battery is effectively improved; on the other hand, the blocking structure belongs to one part of the shell, has good mechanical performance, is not easy to damage when in thermal runaway, and relieves the deterioration of the thermal runaway caused by blocking the pressure relief mechanism due to the damage of the blocking structure, thereby effectively improving the safety performance of the battery.

In some embodiments, the blocking structure includes a baffle fixedly connected to an inner wall of the housing, and the baffle is spaced apart from the pressure relief mechanism.

In the embodiment of this application, the barrier structure can be the form of baffle, and the mechanical strength of the barrier structure of baffle form is good and be convenient for processing, easily realize, still helps improving the production efficiency of battery when improving the security performance of battery.

In some embodiments, in a direction perpendicular to the inner wall of the housing where the pressure relief mechanism is located, a projection of the baffle on the inner wall of the housing where the pressure relief mechanism is located is smaller than or equal to the inner wall of the housing.

In the embodiment of this application, the baffle size can be according to the nimble setting of multiple factors such as probability, required mechanical strength, the inside space utilization of battery, machining efficiency of specific battery system thermal runaway.

In some embodiments, the baffle has a first through hole.

In the embodiment of this application, can make inside gas discharge through pressure release mechanism faster when battery thermal runaway through setting up first through-hole on the baffle to improve the free pressure release speed of battery when thermal runaway, reduce the too high condition that leads to welding seam or casing fracture and then cause more serious incident of single internal pressure of battery, from this, further improved the security performance of battery.

In some embodiments, a projection of the first through hole at least partially covers a projection of the pressure relief mechanism in a direction perpendicular to an inner wall of the housing where the pressure relief mechanism is located.

In some embodiments, in a direction perpendicular to the inner wall of the housing where the pressure relief mechanism is located, a projection of the baffle on the inner wall of the housing where the pressure relief mechanism is located is smaller than the inner wall of the housing, and the blocking structure further includes a side plate disposed on at least one side of the baffle, where the side plate extends from the baffle to the pressure relief mechanism.

In the embodiment of the application, the blocking structure can further comprise the side plate, and under the condition that the size of the baffle is smaller, the mechanical strength and the structural stability of the blocking structure can be effectively improved, so that the anti-vibration battery is favorable for more effectively blocking the movement of the electrode assembly when the battery is out of thermal control, and further the safety performance of the battery is improved.

In some embodiments, the first via is a rectangular via extending in a length direction of the opening or a width direction of the opening.

In the embodiment of this application, set up the through-hole into the rectangle structure that extends along fixed direction for the size of through-hole is great, more be favorable to gaseous quick discharge, and free pressure release efficiency of battery when improving thermal runaway, thereby help improving the security performance of battery.

In some embodiments, the side plate has a second through hole therein.

In the embodiment of the application, the second through hole is formed in the side plate, so that on one hand, under the condition that the baffle is not provided with the first through hole, the gas in the single battery can be exhausted through the pressure relief mechanism quickly when the thermal runaway happens; on the other hand, when the first through hole is formed in the baffle, the efficiency of discharging gas from the interior of the battery cell during thermal runaway can be further improved, and the safety performance of the battery can be further improved.

In some embodiments, the battery cell further includes an electrode assembly having tabs, the electrode assembly being received in the case, the end cap having electrode terminals disposed thereon; the baffle plate is also provided with a leading-out hole for the pole lug to pass through, and the electrode terminal is electrically connected with the pole lug; or lead-out holes for the pole lugs to pass through are formed between the baffle and the inner wall of the shell at intervals, and the electrode terminal is electrically connected with the pole lugs.

In the embodiment of this application, can also set up the hole of drawing forth that supplies utmost point ear to pass in the position that corresponds on the baffle under the great condition of baffle size, realize utmost point ear and electrode terminal's effective electricity and be connected, the great structure that blocks of size has stronger mechanical properties simultaneously, can block electrode subassembly's drunkenness more effectively.

In some embodiments, the blocking structure comprises at least one catch arm disposed opposite the pressure relief mechanism.

In some embodiments, the blocking structure comprises at least one cantilever arm disposed opposite the pressure relief mechanism.

In the embodiment of the application, the blocking structure can also be in the form of a blocking arm, a cantilever and the like, so that the specific form of the blocking structure can be flexibly set according to the specific structure and the requirement of a specific battery cell. In addition, when the blocking structure is in the form of a blocking arm, a cantilever and the like, the occupied volume of the blocking structure in the single battery can be reduced, and the space utilization rate in the single battery can be improved while the safety performance of the battery is improved.

In some embodiments, the housing further comprises an insulating layer disposed on an inner wall of the shell.

In an embodiment of the present application, the inner wall of the housing comprises a surface within the housing and a surface of the barrier structure inside the housing. The insulating layer is arranged on the inner wall of the shell, so that the short circuit of the battery caused by the overlap joint of the electrode assembly and the shell when the battery is out of control due to heat can be effectively prevented, the further deterioration of the out of control due to heat can be prevented, and the safety performance of the battery can be improved.

In some embodiments, the housing and the blocking structure are integrally formed by stamping or welded.

In the embodiment of this application, the casing can be integration machine-shaping's structure, also can be welding forming's structure, when using integration machine-shaping's structure, because block the structure and be some of casing itself, do not have the solder joint, have better mechanical strength and structural stability, can block electrode subassembly's drunkenness more effectively when battery thermal runaway, avoid electrode subassembly or block structure itself and block pressure relief mechanism to improve the security performance of battery.

In a second aspect, a battery is provided, which includes the battery cell of the first aspect.

In a third aspect, an electrical device is provided, which includes the battery cell of the first aspect and/or the battery of the second aspect, and the battery cell and/or the battery is used for providing electrical energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

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

fig. 2 is a schematic structural view of a battery according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

fig. 4 is a schematic structural view of a housing of a battery cell according to an embodiment of the present application;

FIG. 5 is another schematic block diagram of a housing of a battery cell housing according to an embodiment of the present disclosure;

FIG. 6 is a further schematic block diagram of a housing of a battery cell housing according to an embodiment of the present application;

fig. 7 is a further schematic structural view of a housing of a battery cell housing according to an embodiment of the present application;

FIG. 8 is another schematic block diagram of a battery in accordance with an embodiment of the present application;

fig. 9 is another schematic structural diagram of an electric device according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and therefore should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in this application can be understood as appropriate by one of ordinary skill in the art.

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: there are three cases of A, A and B, and B. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

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.

In this application, a battery refers to a physical module including one or more battery cells to provide electrical energy. 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.

Alternatively, the battery cell may include a lithium ion battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in this application.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and a diaphragm. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is used as a positive electrode lug. 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 current collector and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative current collector, and the mass flow body protrusion in the mass flow body of coating the negative pole active substance layer of uncoated negative pole active substance layer, the mass flow body of uncoated 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 diaphragm may be Polypropylene (PP), polyethylene (PE), or the like. 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 development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, and other performance parameters, and also needs to consider the production cost and processing technology of the battery to improve the quality and production efficiency of the battery.

In some battery manufacturing technologies, a plurality of battery cells (cells) are first integrated into a battery module, and then the battery module is mounted in a battery case to form a battery pack (pack). In other production and processing technologies, a plurality of battery monomers can be directly arranged in the box body to form the battery pack, and the intermediate state of the battery module is eliminated, so that the quality of the battery pack can be reduced, and the energy density of the battery can be improved. The second manufacturing technology may also be referred to as a cell to pack (cell to pack) packaging technology, and the pack may be referred to as a battery in this application.

When the battery is out of control thermally, a large amount of gas can be generated due to severe internal chemical reaction, the gas generation time is long, the temperature is high, if the large amount of gas cannot be discharged in time through the pressure relief mechanism, the internal gas pressure of the battery can be increased rapidly, the welding seam or the shell of the battery can be cracked, and explosion can be caused in severe cases. When the battery is out of control due to heat, airflow formed by a large amount of gas has strong impact force, and the electrode assembly in the battery can move, so that the electrode assembly blocks the pressure relief mechanism, and the safety problem is further caused.

In view of the above, embodiments of the present application provide a battery cell, a battery and an electric device. The free casing of battery in this application embodiment has the structure that blocks that corresponds the setting with pressure release mechanism, can block electrode subassembly's drunkenness when battery thermal runaway, prevents that pressure release mechanism from being blockked up, and battery monomer can effective pressure release when guaranteeing battery thermal runaway to improve the security performance of battery.

The technical scheme described in the embodiment of the application is suitable for various electric equipment using batteries.

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 extending 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 specifically limit the above-mentioned electric devices.

For the sake of brevity, the following embodiments are described with reference to an electric vehicle as an example.

For example, as shown in fig. 1, which is a schematic structural diagram of a vehicle 1 according to the present application, the vehicle 1 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 an extended range automobile, etc. The vehicle 1 may be provided with a motor 11, a controller 12 and a battery 10, the controller 12 being configured to control the battery 10 to supply power to the motor 11. For example, the battery 10 may be provided at the bottom or the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operation power source of the vehicle 1 for a circuit system of the vehicle 1, for example, for power demand for operation in starting, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1 instead of or in part of fuel or natural gas to provide driving power to the vehicle 1.

In order to meet different power requirements, the battery may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. The battery may also be referred to as a battery pack. Alternatively, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form a battery. That is, a plurality of battery cells may directly constitute a battery, or a battery module may be first constituted and then a battery may be constituted.

For example, as shown in fig. 2, the battery 10 may include a plurality of battery cells 20 for a structural schematic diagram of the battery 10 of the present application. The battery 10 may further include a case 100 (or housing), the case 100 has a hollow structure, and the plurality of battery cells 20 are accommodated in the case 100. As shown in FIG. 2, the case 100 may include two parts, referred to herein as a first part 111 and a second part 112, respectively, with the first part 111 and the second part 112 snap together. The shape of the first and second portions 111 and 112 may be determined according to the shape of a combination of a plurality of battery cells 20, and the first and second portions 111 and 112 may each have one opening. For example, each of the first portion 111 and the second portion 112 may be a hollow rectangular parallelepiped and only one surface of each may be an opening surface, the opening of the first portion 111 and the opening of the second portion 112 are oppositely disposed, and the first portion 111 and the second portion 112 are fastened to each other to form the box 100 having a closed chamber. The plurality of battery cells 20 are connected in parallel or in series or in a combination of series and parallel to each other and then placed in the case 100 formed by fastening the first part 111 and the second part 112.

Optionally, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for electrically connecting the plurality of battery cells 20, such as in parallel or in series-parallel. Specifically, the bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus bar member may be fixed to the electrode terminals of the battery cells 20 by welding. The electric energy of the plurality of battery cells 20 can be further extracted through the case 100 by the conductive mechanism. Alternatively, the conductive means may also belong to the bus bar member.

The number of the battery cells 20 may be set to any number according to various power requirements. A plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve greater capacity or power.

The structure of the battery cell 20 of the embodiment of the present application will be described below with reference to fig. 3.

Battery cell 20 generally includes one or more electrode assemblies 22, a casing 21, and casing 21 includes a case 211 having an opening and an end cap 212. The case 211 is determined according to the shape of one or more electrode assemblies 22 assembled, and the case 211 shown in fig. 3 is a hollow rectangular parallelepiped as an example. Case 211 may have one opening or two openings on opposite sides so that one or more electrode assemblies 22 may be placed in case 211. When case 211 has one opening, one end cap 212 covers the one opening to form a closed cavity in which electrode assembly 22 is placed. When the case 211 has two openings, two end caps 212 cover the two openings, respectively, and are connected to the case 211 to form a closed cavity in which the electrode assembly 22 is placed. The case 21 is filled with an electrolyte, such as an electrolytic solution.

The battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 may be disposed on the end cap 212. The end cap 212 is generally in the shape of a flat plate, and two electrode terminals 214 are fixed to the flat plate surface of the end cap 212, the two electrode terminals 214 being a positive electrode terminal 214a and a negative electrode terminal 214b, respectively. One connecting member 23, which may also be referred to as a current collecting member 23, is disposed at each of the electrode terminals 214, between the end cap 212 and the electrode assembly 22, for electrically connecting the electrode assembly 22 and the electrode terminals 214. When the housing has two end caps 212, two electrode terminals 214 may be provided on one end cap 212 at the same time, or may be provided on two end caps 212, respectively.

As shown in fig. 3, each electrode assembly 22 has a first tab 221a and a second tab 222a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. The first tabs 221a of the one or more electrode assemblies 22 are connected to one electrode terminal through one connecting member 23, and the second tabs 222a of the one or more electrode assemblies 22 are connected to the other electrode terminal through the other connecting member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab 221a through one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab 222a through the other connecting member 23.

In the battery cell 20, the electrode assembly 22 may be provided singly or in plurality according to actual use requirements, and as shown in fig. 3, 4 independent electrode assemblies 22 are provided in the battery cell 20. When there are a plurality of electrode assemblies 22, the tabs of the plurality of electrode assemblies 22 with the same polarity may be folded and flattened to form an integral body and then connected to the electrode terminal 214, or may be connected to the electrode terminal 214 separately, which is not limited in the embodiment of the present invention.

A pressure relief mechanism 213 is typically provided on one wall of the housing 21 of the cell 20. The pressure relief mechanism 213 is configured to actuate to relieve the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value. In one example, the pressure relief mechanism 213 is an explosion-proof valve.

Fig. 4 is a schematic structural view of the housing 21 of the battery cell 20 according to the embodiment of the present application. As shown in fig. 4, the housing 21 includes: a housing 211, an end cap 212. The housing 211 has an opening, the end cap 212 covers the opening to encapsulate the battery cell 20, the pressure relief mechanism 213 is disposed on an inner wall of the housing 21, and the blocking structure 215 is fixed in the housing 211 and is spaced from the pressure relief mechanism 213 at a position close to the pressure relief mechanism 213.

Specifically, a blocking structure 215 corresponding to the pressure relief mechanism 213 is disposed in the housing 211 at a position close to the pressure relief mechanism 213, and the blocking structure 215 may be an arbitrarily shaped member having a certain mechanical strength and fixed to the housing 211. An inner wall of the housing 21 may be an inner wall of the housing 211 or a surface of the end cap 212 facing the inside of the housing 211.

In this embodiment, the housing 21 has a blocking structure 215, and the blocking structure 215 is disposed opposite to the pressure relief mechanism 213 at a position on the housing 211 near the pressure relief mechanism 213. On the one hand, can effectively prevent the interior electrode subassembly 22 drunkenness of battery monomer 20 when battery 10 thermal runaway through setting up barrier structure 215, avoid electrode subassembly 22 to block up pressure relief mechanism 213 because of the drunkenness, guarantee that the inside gas that produces of battery monomer 20 can in time discharge, effectively improve the security performance of battery monomer 20, battery 10. On the other hand, the blocking structure 215 as a part of the housing 211 has good mechanical properties, and is not easily damaged during thermal runaway, so that the blocking structure 215 can be prevented from being damaged to block the pressure relief mechanism 213 during thermal runaway, thereby helping to improve the safety performance of the battery cell 20 and the battery 10. Moreover, compared with the first end cap 212, the blocking structure 215 is further away from the pressure relief mechanism 213 when being disposed on the housing 211, which is more beneficial for the gas to be discharged from the pressure relief mechanism 213, so that the pressure relief performance of the battery cell 20 is not reduced by the blocking structure 215 while the safety performance of the battery cell 20 is improved.

Alternatively, referring to fig. 4, the blocking structure 215 includes a baffle 2151 fixedly coupled to an inner wall of the housing 211, the baffle 2151 being spaced apart from the pressure relief mechanism 213.

Specifically, blocking structure 215 may take the form of a baffle 2151, which may be a rectangular baffle 2151 as shown, a square baffle 2151, or another shaped baffle 2151. The baffle 2151 is arranged opposite to the pressure relief mechanism 213 at an interval, that is, at least a partial area of a projection of the baffle 2151 along a direction perpendicular to the inner wall of the pressure relief mechanism 213 covers the projection of the pressure relief mechanism 213, and a certain distance is provided between the blocking structure 215 and the pressure relief mechanism 213.

In this embodiment, the blocking structure 215 in the form of the baffle 2151 is used, so that the blocking structure 215 has good mechanical strength, and is easy to process and implement. The safety performance of the battery cell 20 and the battery 10 is improved, and the production efficiency of the battery is improved.

Alternatively, referring to fig. 4, the projection of baffle 2151 onto the inner wall of the housing where pressure relief mechanism 213 is located is less than or equal to the inner wall of the housing in a direction perpendicular to the inner wall of housing 21 where pressure relief mechanism 213 is located.

Specifically, in a direction perpendicular to the inner wall of the housing 21 where the pressure relief mechanism 213 is located, the projection of the baffle 2151 on the inner wall of the end cap 212 or the housing 211 where the pressure relief mechanism 213 is located is smaller than or equal to one inner wall of the end cap 212 or the housing 211. That is, the projection of the baffle 2151 on the inner wall of the housing 21 where the pressure relief mechanism 213 is located partially or completely covers the inner wall of the housing 21. Therefore, the blocking structure 215, or the size of the baffle 2151, may be flexibly set and selected according to various factors, such as a specific battery system of the battery cell 20, an internal structure of the battery cell 20, a probability of thermal runaway of the battery system of the battery cell 20, a mechanical strength required by the battery 10 or the battery cell 20, a space utilization rate inside the battery cell 20, and a processing difficulty. For example, if the battery system of the battery cell 20 is relatively susceptible to thermal runaway or is susceptible to thermal runaway, the baffle 2151 is provided with a larger size. For another example, if the internal space structure of the battery cell 20 is limited, the baffle 2151 with a smaller size is provided, which helps to improve the space utilization and energy density of the battery cell 20.

In this embodiment, the size of the baffle 2151 can be flexibly set as required, so that the safety performance of the single battery 20 and the battery 10 can be improved, and the mechanical strength of the blocking structure 215 can be improved, or the space utilization rate, the energy density and other performances of the single battery 20 can be improved.

Alternatively, referring to fig. 4, the shutter 2151 has a first through hole 2151a formed therein.

Specifically, the first through hole 2151a has a hole structure penetrating the baffle 2151 in the thickness direction. The first via 2151a may be circular, rectangular, triangular, or other shape. The first through holes 2151a may be randomly arranged on the baffle 2151, or may be arranged at intervals in rows and columns on the baffle 2151. The size, arrangement and shape of the first through hole 2151a can be flexibly set as required.

In this embodiment, the first through hole 2151a is formed in the baffle 2151, so that the gas inside the battery cell 20 can be exhausted through the pressure relief mechanism 213 more quickly when the battery cell 20 is out of control due to heat. From this, set up first through-hole 2151a on baffle 2151 and can improve battery cell 20's pressure release speed when thermal runaway, avoid battery cell 20 internal pressure when thermal runaway too high to lead to welding seam or casing 211 fracture and then cause more serious incident, further promoted battery cell 20, battery 10's security performance.

Alternatively, with continued reference to fig. 4, the first through-hole 2151a is a rectangular through-hole extending in the length direction of the opening of the housing 211 or the width direction of the opening of the housing 211.

In this embodiment, set first through-hole 2151a to the jumbo size rectangle through-hole that extends along fixed direction, because the through-hole size is great, be favorable to gaseous quick discharge more, the pressure release efficiency when can further improve battery monomer 20 thermal runaway to help improving battery monomer 20, battery 10's security performance.

Optionally, a projection of the first through hole 2151a at least partially overlaps a projection of the pressure relief mechanism 213 in a direction perpendicular to an inner wall of the housing 21 in which the pressure relief mechanism 213 is located.

In this embodiment, the first through hole 2151a at least partially overlaps with a projection of the pressure relief mechanism 213 in the same direction, so that when the battery cell 20 is thermally out of control, gas can quickly reach the pressure relief mechanism 213 through a shorter path and be exhausted through the pressure relief mechanism 213.

Fig. 5 is a schematic structural view of another housing 211 of the housing 21 of the battery cell 20 according to the embodiment of the present application.

Alternatively, as shown in fig. 4 and 5, in a direction perpendicular to the inner wall of the housing where the pressure relief mechanism 213 is located, the projection of the baffle 2151 on the inner wall of the housing 21 where the pressure relief mechanism 213 is located is smaller than the inner wall of the housing 21, the blocking structure 215 includes a side plate 2152, the side plate 2152 is disposed on at least one side of the baffle 2151, and the side plate 2152 extends from the baffle 2151 to the pressure relief mechanism 213.

Specifically, taking the rectangular baffle 2151 in fig. 5 as an example, the side plate 2152 is provided on at least one of two opposite sides of the rectangular baffle 2151, and preferably, the side plates 2152 are provided on both sides. Side plate 2152 may extend from one wall to another within housing 211 as shown in fig. 5, or may extend from only one wall to another. When two side plates 2152 are provided, the positions where the two side plates 2152 are provided may be symmetrical or asymmetrical with respect to the geometric center of the baffle 2151. The side plate 2152 may extend from the baffle 2151 to the pressure relief mechanism 213, or may extend from the baffle 2151 to an inner wall of the housing 21 where the pressure relief mechanism 213 is located and be welded to the end cap in a subsequent packaging process.

In this embodiment, by using the blocking structure 215 having the side plate 2152, in the case that the size of the blocking plate 2151 is small, the mechanical strength and the structural stability of the blocking structure 215 are improved, and the movement of the electrode assembly 22 is effectively blocked when the battery is in thermal runaway, so that the safety performance of the battery cell 20 and the battery is further improved.

Fig. 6 is a schematic structural diagram of another housing 211 of the housing 21 of the battery cell 20 according to the embodiment of the present application.

Optionally, as shown in fig. 6, the side plate 2152 has a second through-hole 2152a formed therein.

Specifically, the second through hole 2152a has a hole structure penetrating the side plate 2152 in the thickness direction. The second via 2152a may be circular, rectangular, triangular, or other shape. The second through holes 2152a may be randomly arranged on the side plate 2152, or may be arranged in rows and columns at intervals on the side plate 2152. The size, arrangement and shape of the second through hole 2152a can be flexibly set as required. For example, for a blocking structure 215 having both a baffle 2151 and a side plate 2152, only the first through hole 2151a may be provided in the baffle 2151, only the second through hole 2152a may be provided in the side plate 2152, or both the first through hole 2151a and the second through hole 2152a may be provided in the baffle 2151 and the side plate 2152, or neither through hole may be provided.

In this embodiment, the second through hole 2152a is formed in the side plate 2152, so that on one hand, when the baffle 2151 is not provided with the first through hole 2151a, the gas inside the battery cell 20 is rapidly discharged through the pressure relief mechanism 213 during thermal runaway; on the other hand, when the first through hole 2151a is formed in the baffle 2151, the pressure relief efficiency of the battery cell 20 during thermal runaway is further improved, and therefore, the safety performance of the battery cell 20 and the battery is further improved.

Fig. 7 is a schematic structural view of still another housing 211 of the outer case 21 of the battery cell 20 according to the embodiment of the present disclosure.

Optionally, as shown in fig. 7, the baffle 2151 further has an outlet 2151b for the first tab 221a and/or the second tab 222a to pass through.

Specifically, when the pressure relief mechanism 213 is provided in the end cap 212 having the electrode terminal 214 and the size of the shutter 2151 is large, the shutter 2151 is further provided with a lead-out hole 2151b. For example, when the projection of the baffle 2151 on the inner wall of the housing 21 where the pressure relief mechanism 213 is located is equal to the inner wall of the housing 21, that is, when the size of the baffle 2151 is consistent with the inner wall of the end cap 212 where the pressure relief mechanism 213 is located or the inner wall of the housing 211 where the pressure relief mechanism 213 is located, an outlet 2151b may be provided on the baffle 2151, so that the first tab 221a and/or the second tab 222a pass through the baffle 2151 to be electrically connected to the electrode terminal 214 on the end cap 212. For another example, the baffle 2151 has a larger size but is still smaller than the size of the end cap 212 where the pressure relief mechanism 213 is located or the size of the inner wall of the housing 211 where the pressure relief mechanism 213 is located, and an outlet 2151b for the first tab 221a and/or the second tab 222a to pass through is formed between the baffle and the inner wall of the housing 211, so that the first tab 221a and/or the second tab 222a are electrically connected to the electrode terminal 214.

In this embodiment, when the size of the baffle 2151 is large, the outlet 2151b is formed on the baffle 2151, so that the mechanical performance of the blocking structure 215 is further enhanced, and at the same time, the electrical connection between the first tab 221a and/or the second tab 222a and the electrode terminal 214 can be realized, and the movement of the electrode assembly 22 due to thermal runaway of the battery cell 20 can be more effectively prevented.

Optionally, the blocking structure 215 includes at least one catch arm disposed opposite the pressure relief mechanism 213.

Optionally, the blocking structure 215 includes at least one cantilever arm disposed opposite the pressure relief mechanism 213.

Specifically, in addition to the blocking structure 215 in the form of the baffle 2151 described above, the blocking structure 215 may also be in the form of a plurality of arms, cantilevers. The number and shape of the stop arms and the cantilevers can be flexibly set according to the specific structure and requirements of the battery cell 20.

Optionally, the housing 21 further comprises an insulating layer disposed on an inner wall of the housing 211. Specifically, the inner wall of the housing 211 includes all inner surfaces of the housing 211 and all outer surfaces of the blocking structure inside the housing, in other words, the inner wall of the housing 211 includes all walls inside the housing 211 and all walls of the blocking structure 215 disposed inside the housing 211.

Preferably, the insulating layer is a high temperature resistant insulating layer.

In this embodiment, the insulating layer is disposed on the inner wall of the case 211, so that thermal runaway of the battery cell 20 can be effectively prevented, the electrode assembly 22 and the case 211 are overlapped to cause a battery short circuit, and a more serious safety accident is avoided. Further, the high-temperature-resistant insulating layer can prevent the insulating layer from melting under the high-temperature condition of thermal runaway, and the probability of the occurrence of the condition is further reduced. Therefore, the insulating layer is provided on the inner wall of the case 211 to prevent further deterioration of thermal runaway, and the safety performance of the battery cell 20 and the battery 10 is effectively improved.

Optionally, the housing 211 and the blocking structure 215 are an integral stamped and formed structure.

Optionally, the housing 211 and the blocking structure 215 are cast structures.

Optionally, the housing 211 and the blocking structure 215 are formed by welding.

Specifically, the housing 211 and the blocking structure 215 may be formed by various methods, in other words, the blocking structure 215 may be disposed on the housing 211 by welding, or may be integrally formed as a part of the housing 211 by stamping, casting, or the like.

In this embodiment, the housing 211 and the blocking mechanism 215 are manufactured in an integrated processing manner, and the blocking mechanism 215 is a part of the housing 211 and has no welding spot, so that the mechanical strength and the structural stability are better, the movement of the electrode assembly 22 can be effectively blocked when the battery cell 20 is in thermal runaway, the situations that the welding spot is melted and the pressure relief mechanism 213 is blocked by the movement of the blocking mechanism 215 in the thermal runaway process are avoided, and the safety performance of the battery cell 20 and the safety performance of the battery 10 are further improved.

The embodiment of the present application further provides a battery 10 and an electric device 900, fig. 8 is another schematic structural diagram of the battery 10 according to the embodiment of the present application, and fig. 9 is a schematic structural diagram of another electric device 900 according to the embodiment of the present application.

As shown in fig. 8, the battery 10 includes a battery cell 20 according to any of the embodiments of the present application.

As shown in fig. 9, the power consumption device 900 includes the battery cell 20 or the battery 10 according to any embodiment of the present application, and the battery cell 20 or the battery 10 is used for supplying power to the power consumption device 900.

To sum up, this application can effectively avoid electrode assembly 22 to play the condition of blockking pressure relief mechanism 213 when battery cell 20 thermal runaway when electrode assembly 22 sets up the casing 211 that has barrier structure 215 in battery cell 20 to battery cell 20's security performance has greatly been improved.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (12)

1. A battery cell, comprising:

the shell comprises a shell body and an end cover, wherein the shell body is provided with an opening, and the end cover covers the opening;

the pressure relief mechanism is fixedly connected to one wall of the shell;

and the blocking structure is fixedly connected in the shell, and is arranged at a position close to the pressure relief mechanism and opposite to the pressure relief mechanism at an interval.

2. The battery cell of claim 1, wherein the blocking structure comprises a baffle fixedly connected to an inner wall of the housing, and the baffle is spaced apart from the pressure relief mechanism.

3. The battery cell as recited in claim 2, wherein a projection of the baffle on the inner wall of the housing where the pressure relief mechanism is located is less than or equal to the inner wall of the housing in a direction perpendicular to the inner wall of the housing where the pressure relief mechanism is located.

4. The battery cell as recited in claim 2, wherein the baffle has a first through hole therein.

5. The battery cell as recited in claim 4, wherein a projection of the first through hole at least partially covers a projection of the pressure relief mechanism in a direction perpendicular to an inner wall of the housing where the pressure relief mechanism is located.

6. The battery cell according to claim 3, wherein, in a direction perpendicular to the inner wall of the housing where the pressure relief mechanism is located, a projection of the baffle on the inner wall of the housing where the pressure relief mechanism is located is smaller than the inner wall of the housing, the blocking structure further comprises a side plate, the side plate is disposed on at least one side of the baffle, and the side plate extends from the baffle to the pressure relief mechanism.

7. The battery cell as recited in claim 6 wherein the side plate has a second through hole therein.

8. The battery cell as recited in claim 2, further comprising an electrode assembly having tabs, the electrode assembly being received in the housing, the end cap having electrode terminals disposed thereon;

the baffle plate is also provided with a lead-out hole for the pole lug to pass through, and the electrode terminal is electrically connected with the pole lug;

or leading-out holes for the pole lugs to pass through are formed between the baffle and the inner wall of the shell at intervals, and the electrode terminal is electrically connected with the pole lugs.

9. The battery cell of any of claims 1-8, wherein the housing further comprises an insulating layer disposed on an inner wall of the casing.

10. The battery cell of any of claims 1-8, wherein the housing and the blocking structure are integrally stamped and formed, or the housing and the blocking structure are welded and formed.

11. A battery comprising a cell according to any one of claims 1 to 10.

12. An electric consumer, characterized in that the electric consumer comprises a battery cell according to any of claims 1-10 and/or a battery according to claim 11, which battery cell and/or battery is used for providing electric energy.

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