CN114583341A

CN114583341A - Battery cell, manufacturing method and manufacturing system thereof, battery and electric device

Info

Publication number: CN114583341A
Application number: CN202210462866.9A
Authority: CN
Inventors: 胡璐; 陈小波
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-06-03

Abstract

The application provides a battery cell, a manufacturing method and a manufacturing system thereof, a battery and an electric device. The battery monomer includes shell and hot melt spare, and the shell has and holds chamber and through-hole, and the through-hole intercommunication holds the chamber and holds the outside in chamber. The hot melting piece is connected to the shell and arranged to cover the through hole. The hot melt is used for the isolated outside that holds the chamber and hold the chamber, and the melting point T of hot melt satisfies: t is more than or equal to 70 ℃ and less than or equal to 200 ℃. The application provides a battery monomer can improve the free work security of battery.

Description

Battery cell, manufacturing method and manufacturing system thereof, battery and electric device

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to a battery cell, a manufacturing method and a manufacturing system thereof, a battery, and an electric device.

Background

Batteries are widely used in electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and the like.

In addition to improving the performance of batteries, safety issues are also a concern in the development of battery technology. Therefore, how to improve the safety of the battery is a problem to be solved urgently in the battery technology.

Disclosure of Invention

The embodiment of the application provides a single battery, a manufacturing method and a manufacturing system of the single battery, a battery and an electric device, and safety of the single battery in the working process can be improved.

In a first aspect, an embodiment of the present application provides a battery cell, which includes a case and a hot melt member; the shell is provided with an accommodating cavity and a through hole, and the through hole is communicated with the accommodating cavity and the outside of the accommodating cavity; the hot melt piece is connected in the shell to cover the through-hole setting, the hot melt piece is used for the isolated outside that holds the chamber and hold the chamber, and the melting point T of hot melt piece satisfies: t is more than or equal to 70 ℃ and less than or equal to 200 ℃.

According to the battery monomer that this application embodiment provided, through setting up hot melt to set up hot melt and cover the through-hole setting, and the fusing point T of hot melt satisfies: t is more than or equal to 70 ℃ and less than or equal to 200 ℃, then when the battery monomer has the risk of thermal runaway, the hot melt piece melts, can let in the coolant liquid to holding the intracavity through the through-hole to lower the temperature to the battery monomer. Therefore, before thermal runaway of the single battery occurs, the temperature of the single battery can be reduced, the heat of the single battery is prevented from spreading to the adjacent single battery, the risk of large-scale thermal runaway of the single battery is reduced, and the working safety of the single battery is improved.

In some embodiments, the thermal fuse is in a sheet shape, the through hole has a step surface, and the thermal fuse is connected to the step surface. So set up, be convenient for more the being connected of hot melt spare and shell.

In some embodiments, the melting point T of the hot melt satisfies: t is more than or equal to 80 ℃ and less than or equal to 120 ℃. The hot melting piece can not be melted when the single battery body works normally, and the hot melting piece is completely melted before the single battery body is thermally out of control, so that the risk of thermal out of control of the single battery body is further reduced.

In some embodiments, the through holes include first through holes and second through holes arranged at intervals, the thermal melting members include first thermal melting members and second thermal melting members, the first thermal melting members are arranged to cover the first through holes, and the second thermal melting members are arranged to cover the second through holes. 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 to form an accommodating cavity; the first through-hole is formed in the end cap, and/or the second through-hole is formed in the end cap. So set up, be convenient for smoothly to holding the intracavity and spray the coolant liquid to cool down battery monomer fast.

In a second aspect, an embodiment of the present application provides a battery, which includes a box body, a battery cell provided in any one of the above embodiments, and a spray assembly; the box body is provided with an accommodating space; the battery monomer is positioned in the accommodating space; the spray assembly is arranged in the accommodating space and comprises a pipeline and a spray head communicated with the pipeline, the spray head is provided with a spray nozzle, and the spray nozzle is opposite to at least part of the through hole and is used for spraying cooling liquid to the accommodating cavity through the through hole after the hot melting piece is melted.

The battery provided by the embodiment of the application has the same technical effect due to the adoption of the battery cell provided by any one of the above embodiments, and the details are not repeated herein.

In some embodiments, the through holes include first through holes and second through holes which are arranged at intervals, the hot melting pieces include first hot melting pieces and second hot melting pieces, the first hot melting pieces are arranged to cover the first through holes, and the second hot melting pieces are arranged to cover the second through holes; one of the first through hole and the second through hole is disposed opposite to the spout. So, can regard as the circulation passageway of coolant liquid with one in first through-hole and the second through-hole, the balanced mouth of atmospheric pressure is regarded as to another, is convenient for cool down to battery monomer fast.

In some embodiments, the hot melt is disposed against the spray head and covers the spout. The battery pack is favorable for realizing accurate cooling of the battery monomer and saving cooling liquid.

In some embodiments, the conductivity ρ of the cooling liquid satisfies: rho is more than or equal to 1S/m. Therefore, the electrode assembly can be discharged, and the risk of further temperature rise of the battery cell is reduced.

In some embodiments, the battery includes a plurality of battery cells, the pipe has a plurality of nozzles, and one nozzle is disposed for each battery cell. Further providing the working safety of the battery cell.

In a third aspect, the present embodiment provides an electric device, including the battery provided in any of the above embodiments, where the battery is used to provide electric energy.

In a fourth aspect, an embodiment of the present application provides a method for manufacturing a battery cell, including: providing a shell, wherein the shell is provided with a containing cavity and a through hole, and the through hole is communicated with the containing cavity and the outside of the containing cavity; providing a hot melt, wherein the melting point T of the hot melt meets the following requirements: t is more than or equal to 70 ℃ and less than or equal to 200 ℃; and assembling the shell and the hot melting piece, wherein the hot melting piece is connected to the shell and covers the through hole, and the hot melting piece is used for isolating the accommodating cavity and the outside of the accommodating cavity.

In a fifth aspect, an embodiment of the present application provides a system for manufacturing a battery cell, including a first providing module, a second providing module, and an assembling module; the first providing module is used for providing a shell, the shell is provided with an accommodating cavity and a through hole, and the through hole is communicated with the accommodating cavity and the outside of the accommodating cavity; the second providing module is used for providing hot melt pieces, and the melting point T of the hot melt pieces meets the following requirements: t is more than or equal to 70 ℃ and less than or equal to 200 ℃; the assembling module is used for assembling the shell and the hot melting piece, wherein the hot melting piece is connected to the shell and covers the through hole, and the hot melting piece is used for isolating the accommodating cavity and the outside of the accommodating cavity.

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 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 a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

fig. 2 is an exploded view of a battery according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a battery module in a battery provided in an embodiment of the present application;

fig. 4 is an exploded schematic view of a battery cell provided in an embodiment of the present application;

fig. 5 is a front view of a battery cell provided in an embodiment of the present application;

FIG. 6 is a cross-sectional view taken along A-A of FIG. 5;

FIG. 7 is an enlarged partial schematic view at B of FIG. 6;

FIG. 8 is another enlarged partial schematic view at B of FIG. 6;

FIG. 9 is a further enlarged partial schematic view at B of FIG. 6;

fig. 10 is a schematic structural diagram of a battery cell provided in an embodiment of the present application;

fig. 11 is a front view of another battery cell provided in an embodiment of the present application;

FIG. 12 is a cross-sectional structural view taken along C-C of FIG. 11;

FIG. 13 is an enlarged view of a portion of FIG. 12 at D;

fig. 14 is an exploded view of another battery according to an embodiment of the present invention;

fig. 15 is an exploded view of the battery provided in the embodiment of the present application with the case omitted;

fig. 16 is a block flow diagram of a method for manufacturing a battery cell according to an embodiment of the present disclosure;

fig. 17 is a schematic structural diagram of a system for manufacturing a battery cell according to an embodiment of the present application.

In the drawings, the drawings are not necessarily to scale.

Description of the labeling:

1. a vehicle; 1a, a motor; 1b, a controller;

10. a battery; 11. a box body; 11a, an accommodating space; 111. a first tank portion; 112. a second tank portion; 113. a cooling plate;

20. a battery module;

30. a battery cell; 31. a housing; 31a, an accommodating cavity; 31b, a through hole; 311b, a first via hole; 312b, a second through hole; 31c, step surfaces; 311. a housing; 311a, an opening; 312. an end cap; 32. a hot melt member; 321. a first hot melt member; 322. a second hot melt; 33. an electrode assembly;

40. a spray assembly; 41. a pipeline; 42. a spray head; 42a, a spout;

100. a manufacturing system; 110. a first providing module; 120. a second providing module; 130. and assembling the module.

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, but 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 have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," 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 is within the tolerance of the error.

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 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 the present application can be understood as appropriate by one 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 a packaging manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are not limited in the embodiment of the application.

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 consists of a positive plate, a negative plate and a separator. 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 laminated to be 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 pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the mass flow body protrusion in the mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer is as negative pole utmost point ear after the mass flow body of not scribbling the negative pole active substance layer is range upon range of. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The material of the diaphragm can be PP or PE, etc. 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 safety of the battery.

In the single battery, experience charge-discharge cycle many times, there is the side reaction, continuously produces gas, makes the single inside of battery have certain atmospheric pressure, can lead to the gas between the pole piece not in time to discharge along with the rising of atmospheric pressure to influence the embedding and deviating from of lithium ion, and then lead to the lithium risk of educing. In order to ensure the safety of the battery cells, an exhaust device is generally disposed in the battery cells, and gas generated inside the battery cells is exhausted through the exhaust device to ensure the safety of the battery cells.

The inventor finds that after the battery has a risk of thermal runaway in the working process, systematic analysis and research are carried out on the structure and the working process of the battery, and as a result, when one battery monomer inside the battery is subjected to the thermal runaway, heat can be transferred to the adjacent battery monomer to cause the thermal runaway of the adjacent battery monomer.

Based on the above problems discovered by the inventor, the inventor improves the structure of the battery cell, and the technical solution described in the embodiment of the present application is applicable to the battery cell, the battery including the battery cell, and the electric device using the battery.

According to this application embodiment provide battery monomer includes shell and hot melt spare, and the shell has and holds chamber and through-hole, and the through-hole intercommunication holds the outside that the chamber was held to the chamber and hold the chamber, and the hot melt spare is connected in the shell to cover the through-hole setting. After the free temperature of battery reached the melting point of hot melt spare, the hot melt spare just begins to melt, treats that the hot melt spare melts completely the back, alright spray the coolant liquid to holding the intracavity in order to pass through the through-hole, so, reduce the free temperature of battery, prevent that the free thermal runaway of battery from spreading to other battery monomer, reduce the risk that the thermal runaway of a relatively large scale appears in the battery, improve the work security of battery.

The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool 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 tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and electric 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 with an electric device as an example of a vehicle.

As shown in fig. 1, a battery 10 is provided inside a vehicle 1. The battery 10 may be disposed at the bottom or the head or the tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, and for example, the battery 10 may serve as an operation power source of the vehicle 1.

The vehicle 1 may further include a controller 1b and a motor 1 a. The controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, for operation power demand at the time of starting, navigation, and traveling of the vehicle 1.

In some embodiments of the present application, the battery 10 may not only serve as an operating power source of the vehicle 1, but also serve 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.

Referring to fig. 2, the battery 10 includes battery cells (not shown in fig. 2). The battery 10 may further include a case 11 for accommodating the battery cells.

The case 11 is used for accommodating the battery cells, and the case 11 may have various structures. In some embodiments, cabinet 11 may include a first cabinet portion 11 and a second cabinet portion 112. The first casing portion 111 and the second casing portion 112 are mutually covered. The first and

second case portions

111 and 112 collectively define an accommodating space 11a for accommodating the battery cells. The second casing part 112 may be a hollow structure with one open end, the first casing part 111 is a plate-shaped structure, and the first casing part 111 covers the open side of the second casing part 112 to form the casing 11 with the accommodating space 11 a; the first tank portion 111 and the second tank portion 112 may be both hollow structures with one side open. The open side of the first casing 111 covers the open side of the second casing 112 to form a casing 11 having an accommodating space 11 a. Of course, the first and

second casing portions

111 and 112 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In order to improve the sealing performance of the first casing portion 111 and the second casing portion 112 after being connected, a sealing member, such as a sealant or a sealing ring, may be disposed between the first casing portion 111 and the second casing portion 112.

If the first casing portion 111 covers the second casing portion 112, the first casing portion 111 may also be referred to as an upper casing cover, and the second casing portion 112 may also be referred to as a lower casing cover.

In the battery 10, one or more battery cells may be provided. If the number of the battery units is multiple, the multiple battery units can be connected in series or in parallel or in series-parallel. The series-parallel connection means that a plurality of battery monomers are connected in series and in parallel. The plurality of battery cells may be directly connected in series or in parallel or in series-parallel, and then the whole body formed by the plurality of battery cells is accommodated in the box body, or the plurality of battery cells may be connected in series or in parallel or in series-parallel to form the battery module 20. The plurality of battery modules 20 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case.

In some embodiments, as shown in fig. 3, fig. 3 is a schematic structural view of the battery module 20 shown in fig. 2. In the battery module 20, there are a plurality of battery cells 30. The plurality of battery cells 30 are connected in series, in parallel, or in series-parallel to form the battery module 20. A plurality of battery modules 20 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case 11.

In some embodiments, the plurality of battery cells 30 in the battery module 20 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 30 in the battery module 20.

Referring to fig. 4, fig. 4 is an exploded view of the battery cell 30 shown in fig. 3. The battery cell 30 provided by the embodiment of the present application includes an electrode assembly 33 and a case 31, the case 31 has a receiving cavity 31a, and the electrode assembly 33 is received in the receiving cavity 31 a.

In some embodiments, the case 31 may include a case 311 and an end cap 312, the case 311 has a hollow structure with one side open, and the end cap 312 is covered at the opening 311a of the case 311 and is hermetically connected to form a sealed space for accommodating the electrode assembly 33 and the electrolyte.

When assembling the battery cell 30, the electrode assembly 33 is first placed in the case 311, the end cap 312 is then fitted to the opening 311a of the case 311, and the electrolyte is injected into the case 311 through the electrolyte injection port of the end cap 312.

In some embodiments, the housing 31 may also be used to contain an electrolyte, such as an electrolyte. The housing 31 may take a variety of configurations.

Fig. 4 shows a schematic structural diagram of a battery cell provided in an embodiment of the present application.

The housing 311 may be various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The shape of the case 311 may be determined according to the specific shape of the electrode assembly 33. For example, if the electrode assembly 33 has a cylindrical structure, the case 311 may alternatively have a cylindrical structure. If the electrode assembly 33 has a rectangular parallelepiped structure, the case 311 may have a rectangular parallelepiped structure. In fig. 4, the case 311 and the electrode assembly 33 are each exemplarily a rectangular parallelepiped structure.

The material of the housing 311 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present invention is not limited thereto.

The electrode assembly 33 accommodated in the case 311 may be one or more. In fig. 4, there are two electrode assemblies 33 accommodated in the case 311.

In some embodiments, the electrode assembly 33 further includes a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 33 may be a wound structure formed of a positive electrode tab, a separator, and a negative electrode tab by winding. The electrode assembly 33 may also be a stacked structure formed by a stacking arrangement of a positive electrode tab, a separator, and a negative electrode tab.

The positive electrode tab may include a positive electrode current collector and a positive electrode active material layer. The positive active material layer is coated on the surface of the positive current collector. The negative electrode tab may include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The separator is arranged between the positive pole piece and the negative pole piece and used for separating the positive pole piece from the negative pole piece so as to reduce the risk of short circuit between the positive pole piece and the negative pole piece.

The material of the spacer may be PP (polypropylene) or PE (polyethylene).

The tabs in the electrode assembly 33 are divided into positive and negative tabs. The positive electrode tab may be a portion of the positive electrode current collector that is not coated with the positive electrode active material layer. The negative electrode tab may be a portion of the negative electrode current collector that is not coated with the negative electrode active material layer.

Fig. 5 is a front view of a battery cell provided in an embodiment of the present application; fig. 6 shows a schematic sectional structure along a-a in fig. 5, and fig. 7, 8 and 9 show enlarged views of a portion at B in fig. 6 in different embodiments.

As shown in fig. 4 to 9, a battery cell 30 provided according to an embodiment of the present application includes a case 31 and a thermal fuse 32. The housing 31 has a housing chamber 31a and a through hole 31b, and the through hole 31b communicates the housing chamber 31a and the outside of the housing chamber 31 a. The thermal melting member 32 is connected to the outer shell 31 and disposed to cover the through hole 31b, the thermal melting member 32 is used to isolate the accommodating cavity 31a and the outside of the accommodating cavity 31a, and a melting point T of the thermal melting member 32 satisfies: t is more than or equal to 70 ℃ and less than or equal to 200 ℃.

Specifically, the accommodating chamber 31a is a space surrounded by the case 31 and used for accommodating the electrode assembly 33 and the like, and the electrode assembly 33 is disposed in the accommodating chamber 31 a. The through hole 31b communicates the accommodating chamber 31a and the outside of the accommodating chamber 31a, and the through hole 31b is provided through a wall portion of the housing 31 so that the accommodating chamber 31a communicates with the outside of the accommodating chamber through the through hole 31 b.

Alternatively, the thermal fuse 32 may be connected to a side surface of the outer shell 31 close to the accommodating cavity 31a, or may be connected to a side surface of the outer shell 31 far from the accommodating cavity 31a, and of course, the thermal fuse 32 may also be connected to a hole wall of the through hole 31b of the outer shell 31, which is not limited herein and may be selected as required.

Alternatively, the thermal melting element 32 may be in various shapes such as a sheet, a block or a column, which is not limited herein and can be selected according to specific requirements.

Alternatively, the connection of the hot melt 32 to the housing 31 may be by welding, gluing, snapping, or the like.

The thermal melting piece 32 is arranged to cover the through hole 31b, so that the orthographic projection edge of the through hole 31b along the self-axial direction is located inside the orthographic projection edge of the thermal melting piece 32 along the axial direction of the through hole 31b, that is, the orthographic projection edge of the through hole 31b along the self-axial direction is partially or completely overlapped with the orthographic projection edge of the thermal melting piece 32 along the axial direction of the through hole 31b, or the orthographic projection edge of the through hole 31b along the self-axial direction is arranged at an interval with the orthographic projection edge of the thermal melting piece 32 along the axial direction of the through hole 31b, and the orthographic projection edge of the through hole 31b along the self-axial direction is located inside the orthographic projection edge of the thermal melting piece 32 along the axial direction of the through hole 31 b.

Alternatively, the material of the hot melt 32 may include at least one of polypropylene, polyethylene terephthalate, and polyvinyl chloride. Of course, the material of the hot melt 32 may also include other materials such as plastics, as long as the melting point range mentioned above can be satisfied.

The thermal melting member 32 isolates the outer portions of the accommodating cavity 31a and the accommodating cavity 31a, and after the thermal melting member 32 is connected to the housing 31, the thermal melting member is disposed to cover the through hole 31b, so that the electrolyte and the like in the accommodating cavity 31a of the battery cell 30 cannot flow out of the accommodating cavity 31a through the through hole 31b, and the external liquid, solid and the like cannot enter the accommodating cavity 31a through the through hole 31 b.

The melting point of the hot melt 32 is different according to the specific components of the material of the hot melt 32, and the melting point T of the hot melt 32 is set to be 70 ℃ to 200 ℃, so that the melting point T of the hot melt 32 can be 70 ℃, 75 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃ or 200 ℃ and the like. When the temperature of the hot melt member 32 reaches the melting point T, the hot melt member 32 starts to melt, and after the melting of the hot melt member 32 is completed, the accommodating cavity 31a communicates with the outside of the accommodating cavity 31a through the through hole 31b, and at this time, the cooling liquid may be injected into the accommodating cavity 31a through the through hole 31 b.

It is understood that the internal temperature of the battery cell 30 gradually increases during the operation, but the temperature of the battery cell 30 will be maintained within a certain temperature range as the operation of the battery cell 30 is normally performed after the temperature of the battery cell 30 increases to a certain temperature due to the existence of the internal cooling system of the battery 10. Generally, the normal operating temperature of the battery cell 30 is about 65 ℃. And once battery monomer 30 has the risk of thermal runaway, battery monomer 30's temperature just continues to increase, and when reaching the melting point T of hot melt 32, hot melt 32 just begins to melt, waits that hot melt 32 melts completely after, holds chamber 31a and communicates with the external world through-hole 31b, can set up the spray assembly 40 of battery 10 inside and spray the coolant liquid in to through-hole 31 b. So as to reduce the temperature of the battery cell 30, prevent the thermal runaway of the battery cell 30 from continuing to spread to other battery cells 30, and reduce the risk of further thermal runaway of the battery 10.

The temperature of the battery cell 30 at which thermal runaway occurs is usually 200 ℃, and if the temperature of the battery cell 30 reaches the temperature of thermal runaway, the battery cell 30 has potential safety hazards such as explosion. Therefore, T is set to be greater than or equal to 70 ℃ and less than or equal to 200 ℃, so that when the single battery 30 works normally, the hot melting piece 32 is not melted, and meanwhile, the single battery 30 can be cooled before thermal runaway occurs.

It should be noted that, due to the increase of the temperature of the battery cell 30, before the thermal melting member 32 is completely melted, the battery cell 30 may transmit the temperature to the adjacent battery cell 30, and the thermal melting member 32 of the adjacent battery cell 30 may also be melted, so as to introduce the cooling liquid into the adjacent battery cell 30.

The battery cell 30 that this application embodiment provided is through setting up hot melt 32 to set up hot melt 32 and cover the setting of through-hole 31b, and the melting point T of hot melt 32 satisfies: t is more than or equal to 70 ℃ and less than or equal to 200 ℃, when the battery monomer 30 has the risk of thermal runaway, the hot melting piece 32 is melted, and cooling liquid can be introduced into the accommodating cavity 31a through the through hole 31b so as to cool the battery monomer 30. Therefore, before thermal runaway of the battery cell occurs, the temperature of the battery cell can be reduced, the heat of the battery cell 30 is prevented from spreading to the adjacent battery cell 30, the risk of large-scale thermal runaway of the battery cell 30 is reduced, and the working safety of the battery cell 30 is improved.

As shown in fig. 6 and 9, in some embodiments, the thermal fuse 32 has a sheet shape, the through hole 31b has a step surface 31c, and the thermal fuse 32 is connected to the step surface 31 c.

Alternatively, the hot melt 32 may be attached to the step surface 31c by gluing or soldering, or the like.

Alternatively, after the thermal fuse 32 is attached to the step surface 31c, the surface of the thermal fuse 32 may be flush with the surface of the case 31, exceed the surface of the case 31, or the surface of the case 31 exceeds the surface of the thermal fuse 32, which is not limited herein.

In the embodiment where the surface of the thermal fuse 32 is flush with the surface of the case 31, it is convenient to form a planar structure on the surface of the case 31 to facilitate the arrangement between the battery cells 30.

It is understood that the thermal fuse 32 is provided in a sheet shape, and the thermal fuse 32 is provided to be connected to the stepped surface 31c of the through hole 31b, which further facilitates the connection of the thermal fuse 32 with the case 31.

In some embodiments, the melting point T of the hot melt 32 satisfies: t is more than or equal to 80 ℃ and less than or equal to 120 ℃. Specifically, the melting point of the hot melt 32 may be 80 ℃, 90 ℃, 100 ℃, 110 ℃, or 120 ℃, etc.

So set up, make the melting point T of hot melt 32 and the normal operating temperature difference of battery monomer 30 bigger, and the thermal runaway temperature of battery monomer 30 and the melting point T of hot melt 32 difference also bigger. Further guarantee that hot melt piece 32 can not take place to melt when battery monomer 30 normally works to guarantee before battery monomer 30 thermal runaway hot melt piece 32 with melt the completion, in order to further reduce battery monomer 30 and appear the risk of thermal runaway.

Optionally, the number of the through holes 31b may be one or more, which is not limited herein and may be selected according to specific requirements.

Fig. 10 shows a schematic structural diagram of a battery cell provided in another embodiment of the present application, fig. 11 shows another front view of a battery cell 30 provided in another embodiment of the present application, fig. 12 shows a schematic sectional structural diagram of fig. 11 along C-C, and fig. 13 shows a partial enlarged view of fig. 12 at D.

As shown in fig. 10 to 13, in some embodiments, the through hole 31b includes a first through hole 311b and a second through hole 312b which are spaced apart from each other, the thermal fuse 32 includes a first thermal fuse 321 and a second thermal fuse 322, the first thermal fuse 321 is disposed to cover the first through hole 311b, and the second thermal fuse 322 is disposed to cover the second through hole 312 b.

Alternatively, the first through hole 311b and the second through hole 312b may be disposed on the same sidewall of the housing 31, or may be disposed on adjacent or opposite sidewalls of the housing 31. The number of the first through holes 311b may be one or more, and similarly, the number of the second through holes 312b may be one or more.

When the temperature of the battery cell 30 reaches the melting point T of the thermal fuse 32, both the first thermal fuse 321 and the second thermal fuse 322 melt, so that both the first through hole 311b and the second through hole 312b are opened. At this time, the cooling liquid may be sprayed into the accommodating chamber 31a through one of the first through hole 311b and the second through hole 312b, and the outside of the accommodating chamber 31a and the housing 31 may be in a communicating state by the other of the first through hole 311b and the second through hole 312b as an air pressure balancing port, and the air pressure in the accommodating chamber 31a may be discharged at the same time, ensuring that the cooling liquid smoothly enters the accommodating chamber 31 a.

Of course, it is also possible to spray the cooling liquid into the accommodating chamber 31a through the first through hole 311b and the second through hole 312b at the same time to accelerate the cooling speed of the battery cell 30.

Therefore, the through holes 31b include the first through holes 311b and the second through holes 312b that are spaced apart, which facilitates cooling of the battery cells 30 more quickly.

In some embodiments, the housing 31 includes a housing 311 and an end cap 312, the housing 311 has an opening 311a, and the end cap 312 covers the opening 311a to form the accommodating cavity 31 a.

Alternatively, the through hole 31b may be formed in the end cap 312 or the housing 311. In the embodiment where the through-hole 31b includes the first through-hole 311b and the second through-hole 312b, it may be provided that one of the first through-hole 311b and the second through-hole 312b is formed in the end cap 312, the other is formed in the housing 311, both are formed in the housing 311, or both are formed in the end cap 312.

In some alternative embodiments, first through-hole 311b is formed in end cap 312, and/or second through-hole 312b is formed in end cap 312. That is, at least one of the first through hole 311b and the second through hole 312b is formed in the end cap 312.

It will be appreciated that, during the grouping of the battery cells 30, the end cap 312 is provided with electrode terminals, etc., so that a larger gap is usually provided between the end cap 312 and the case 11. Therefore, one of the first through hole 311b and the second through hole 312b is formed in the end cap 312, so that the cooling liquid is sprayed into the accommodating chamber 31a through the first through hole 311b and/or the second through hole 312b in the end cap 312.

Fig. 14 is a schematic diagram illustrating an explosive structure of the battery 10 according to the embodiment of the present application, and fig. 15 is a schematic diagram illustrating an explosive structure of the battery provided according to the embodiment of the present application after omitting a part of the structure.

As shown in fig. 14 and 15, a battery 10 provided according to an embodiment of the present application includes a case 11, a battery cell 30 provided in any of the above embodiments, and a shower assembly 40. The case 11 has an accommodating space 11a, and the battery cells 30 are located in the accommodating space 11 a. The spray assembly 40 is disposed in the accommodating space 11a, the spray assembly 40 includes a pipe 41 and a spray head 42 communicating with the pipe 41, and the spray head 42 has a spray opening 42 a. The nozzle 42a is disposed opposite to at least a portion of the through hole 31b and serves to spray the cooling liquid to the receiving cavity 31a through the through hole 31b after the thermal fuse 32 is melted.

Specifically, one spray head 42 may be provided for each battery cell 30, and the spout 42a of the spray head 42 may be provided opposite to at least a portion of the through hole 31 b. Alternatively, the nozzle 42a may be disposed to be completely opposed to the through hole 31b, or the nozzle 42a may be disposed to be partially opposed to the through hole 31 b. In this way, in the process of spraying the cooling liquid by the spray head 42, at least part of the cooling liquid sprayed out through the spray nozzle 42a opposite to the through hole 31b enters the accommodating cavity 31a through the through hole 31b to cool the battery cell 30.

Alternatively, the pipes 41 of the spray assembly 40 may be connected to the inner wall of the case 11 and extend along the arrangement direction of the battery cells 30, so that the spray heads 42 are arranged at intervals along the arrangement direction of the battery cells 30, and the spray heads 42 correspond to the through holes 31b of the battery cells 30 one to one.

Alternatively, the nozzle 42a of the nozzle head 42 may abut the hot melt 32 or may be spaced apart from the hot melt 32, which is not limited herein.

In the embodiment that spout 42a and hot melt 32 set up at an interval, after hot melt 32 melts completely, can set up all shower nozzles 42 that spray assembly 40 and spray the coolant liquid simultaneously, also can be through setting up devices such as sensor, control only sprays the coolant liquid with the shower nozzle 42 that through-hole 31b set up relatively to realize the accurate cooling to battery monomer 30.

In the embodiment where the nozzle 42a abuts against the thermal fuse 32, after the thermal fuse 32 is melted, only the nozzle 42a corresponding to the thermal fuse 32 can spray the cooling liquid, and the other nozzles 42a cannot spray the cooling liquid. Thus, the cooling liquid can be saved while the accurate cooling of the battery cells 30 is realized.

The battery 10 provided in the embodiment of the present application has the same technical effect due to the use of the single battery cell 30 provided in any one of the above embodiments, and details are not repeated here.

In some embodiments, the through hole 31b includes a first through hole 311b and a second through hole 312b which are spaced apart from each other, the thermal fuse 32 includes a first thermal fuse 321 and a second thermal fuse 322, the first thermal fuse 321 is disposed to cover the first through hole 311b, and the second thermal fuse 322 is disposed to cover the second through hole 312 b.

Alternatively, the first through hole 311b and the second through hole 312b may be provided with corresponding nozzles 42a opposite thereto, so that the cooling liquid may be sprayed into the receiving cavity 31a through the first through hole 311b and the second through hole 312b after the first thermal melting member 321 and the second thermal melting member 322 are melted. It is also possible to provide that one of the first through hole 311b and the second through hole 312b is disposed opposite to the nozzle 42a, and the other is not disposed opposite to the nozzle 42a, so that after the first through hole 311b and the second through hole 312b are melted, the nozzle 42a can only spray the cooling liquid into the accommodating cavity 31a through the corresponding first through hole 311b or second through hole 312b, and the first through hole 311b or second through hole 312b that is not opposite to the nozzle 42a can be used as an air pressure balancing port.

In some embodiments, one of the first through hole 311b and the second through hole 312b is disposed opposite the spout 42 a.

So set up, after hot melt 32 melts, shower nozzle 42 sprays the coolant liquid to holding in the chamber 31a through one in first through-hole 311b and the second through-hole 312b, and another in first through-hole 311b and the second through-hole 312b is as the balanced mouth of atmospheric pressure for shower nozzle 42 of spray assembly 40 sprays the coolant liquid to holding in the chamber 31a more smoothly, is convenient for cool down to battery monomer 30 fast.

In some embodiments, the hot melt 32 is disposed against the spray head 42 and covers the spray orifice 42 a.

Alternatively, the thermal fuse 32 and the nozzle 42 may be abutted only, or may be welded, adhered, or thermally fused together.

The hot melt 32 is positioned to cover the nozzle 42a, i.e., the hot melt 32 completely blocks the nozzle 42a before melting, reducing the likelihood that the spray head 42 will spray coolant before the hot melt 32 melts.

So set up, be favorable to guaranteeing that battery monomer 30 hot melt 32 melts the back, only corresponding shower nozzle 42 will spray the coolant liquid to battery monomer 30, and other shower nozzles 42 will not spray the coolant liquid. Therefore, accurate cooling of the battery cells 30 is facilitated, and cooling liquid is saved.

Alternatively, the cooling liquid may be a conductive medium or a non-conductive medium, and both may implement cooling of the battery cell 30.

In some embodiments, the conductivity ρ of the cooling liquid satisfies: rho is more than or equal to 1S/m.

With such an arrangement, the coolant has a certain conductivity, and after the coolant enters the battery cell 30, the positive electrode plate and the negative electrode plate of the electrode assembly 33 are conducted, so that the electrode assembly 33 discharges, and thus, the risk of further temperature rise of the battery cell 30 can be reduced.

In some embodiments, the battery 10 includes a plurality of battery cells 30, the duct 41 has a plurality of spray heads 42, and one spray head 42 is disposed for each battery cell 30.

So, when any battery monomer 30 appears the thermal runaway risk, all can start spraying assembly 40 work to reduce the temperature to battery monomer 30, further improve battery 10's operational safety.

In some embodiments, the battery 10 includes a plurality of two rows of the battery cells 30 arranged in the thickness direction of the battery cells 30, the housing 31 of each battery cell 30 includes a case 311 and an end cap 312, and the end cap 312 covers the opening 311a of the case 311 to form a receiving cavity 31a for receiving the electrode assembly 33. The end cap 312 has a first through hole 311b and a second through hole 312b formed therethrough, and the first through hole 311b and the second through hole 312b are spaced apart from each other. The thermal melting member 32 includes a first thermal melting member 321 and a second thermal melting member 322, the first thermal melting member 321 and the second thermal melting member 322 are respectively disposed on the step surfaces 31c of the first through hole 311b and the second through hole 312b, and surfaces of the first thermal melting member 321 and the second thermal melting member 322 are respectively disposed flush with a surface of the end cap 312 on a side away from the accommodating cavity 31 a. A spray assembly 40 is arranged between the top cover of the battery cell 30 and the box body 11, the spray assembly 40 includes a pipeline 41 and a spray head 42, the first hot melting piece 321 of each battery cell 30 is abutted against the spray head 42, so that the nozzle 42a of the spray head 42 is arranged opposite to the first through hole 311b, and the second hot melting piece 322 is not arranged corresponding to the spray head 42, so that after the first hot melting piece 321 and the second hot melting piece 322 are melted, the spray head 42 sprays cooling liquid into the accommodating cavity 31a through the first through hole 311b, and gas inside the battery cell 30 is discharged through the second through hole 312b, so as to balance the air pressure inside and outside the battery cell 30, so that the cooling liquid more smoothly enters the accommodating cavity 31a through the first through hole 311 b.

The power utilization device provided according to the embodiment of the present application includes the battery 10 provided in any one of the above embodiments, and the battery 10 is used for providing electric energy.

The battery 10 provided in the embodiment of the present application has the same technical effect due to the adoption of the battery 10 provided in any one of the above embodiments, and details are not described herein.

In some embodiments, the case 11 includes a cooling plate 113, the cooling plate 113 abuts against the battery cell 30, and the cooling plate 113 has a flow channel for flowing a cooling liquid. The power consumption device further comprises a liquid storage tank for storing cooling liquid, the liquid storage tank being in communication with the flow and the communication pipe 41.

That is to say, the liquid storage tank is communicated with the flow channel of the cooling plate 113 and the pipeline 41 of the spraying assembly 40 at the same time, that is, the cooling plate 113 and the spraying assembly 40 of the battery 10 share the same liquid storage tank, so that the overall structure of the box body 11 can be simplified on the basis of ensuring the normal operation of the spraying assembly 40 and the cooling plate 113.

Fig. 16 is a flowchart illustrating a method for manufacturing a battery cell according to an embodiment of the present disclosure.

As shown in fig. 16, a method for manufacturing a battery cell according to an embodiment of the present application includes:

s10, providing the housing 31, wherein the housing 31 has a containing cavity 31a and a through hole 31b, and the through hole 31b is communicated with the containing cavity 31a and the outside of the containing cavity 31 a.

S20, providing the hot melt piece 32, wherein the melting point T of the hot melt piece 32 satisfies the following conditions: t is more than or equal to 70 ℃ and less than or equal to 200 ℃.

S30, assembling the case 31 and the thermal fuse 32, wherein the thermal fuse 32 is connected to the case 31 and disposed to cover the through hole 31b, and the thermal fuse 32 is used to insulate the accommodating chamber 31a and the outside of the accommodating chamber 31 a.

The method for manufacturing the battery cell 30 according to the embodiment of the present application can manufacture and form the battery cell 30 according to the embodiment of the present application, and therefore, the method has the same technical effect, and is not described herein again.

Fig. 17 is a schematic structural diagram illustrating a system 100 for manufacturing a battery according to an embodiment of the present application.

As shown in fig. 17, the system 100 for manufacturing a battery cell according to an embodiment of the present disclosure includes a first providing module 110, a second providing module 120, and an assembling module 130. The first providing module 110 is used for providing the housing 31, and the housing 31 has a containing cavity 31a and a through hole 31b, and the through hole 31b communicates the containing cavity 31a and the outside of the containing cavity 31 a. The second providing module 120 is configured to provide the hot melt 32, and the melting point T of the hot melt 32 satisfies: t is more than or equal to 70 ℃ and less than or equal to 200 ℃. The assembly module 130 is used for assembling the outer case 31 and the thermal fuse 32, wherein the thermal fuse 32 is connected to the outer case 31 and disposed to cover the through hole 31b, and the thermal fuse 32 is used for isolating the accommodating chamber 31a and the outside of the accommodating chamber 31 a.

The system 100 for manufacturing the battery cell 30 provided in the embodiment of the present application can be used to manufacture the battery cell 30 provided in the embodiment of the present application, and thus has the same technical effect, and is not described herein again.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner 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

1. A battery cell (30), comprising:

a housing (31) having a housing chamber (31a) and a through hole (31b), the through hole (31b) communicating the housing chamber (31a) and the outside of the housing chamber (31 a);

hot melt (32), connect in shell (31), and cover through-hole (31b) set up, hot melt (32) are used for completely cutting off hold chamber (31a) with hold the outside in chamber (31a), the melting point T of hot melt (32) satisfies: t is more than or equal to 70 ℃ and less than or equal to 200 ℃, and the through hole (31b) is used as a channel for injecting cooling liquid into the accommodating cavity (31a) after the hot melting piece (32) is melted.

2. The battery cell (30) according to claim 1, wherein the thermal fuse (32) has a sheet shape, the through hole (31b) has a step surface (31c), and the thermal fuse (32) is connected to the step surface (31 c).

3. The battery cell (30) of claim 1, wherein the hot melt (32) has a melting point T that satisfies: t is more than or equal to 80 ℃ and less than or equal to 120 ℃.

4. The battery cell (30) of claim 1, wherein the through hole (31b) comprises a first through hole (311b) and a second through hole (312b) which are arranged at intervals, the thermal melting member (32) comprises a first thermal melting member (321) and a second thermal melting member (322), the first thermal melting member (321) is arranged to cover the first through hole (311b), and the second thermal melting member (322) is arranged to cover the second through hole (312 b).

5. The battery cell (30) according to claim 4, wherein the housing (31) comprises a case body (311) and an end cap (312), the case body (311) has an opening (311a), and the end cap (312) covers the opening (311a) to form the accommodating chamber (31 a);

the first through hole (311b) is formed in the end cap (312), and/or the second through hole (312b) is formed in the end cap (312).

6. A battery (10), comprising:

a box body (11) having an accommodating space (11 a);

the battery cell (30) according to any one of claims 1 to 5, the battery cell (30) being located in the accommodating space (11 a);

the spraying assembly (40) is arranged in the accommodating space (11a), the spraying assembly (40) comprises a pipeline (41) and a spray head (42) communicated with the pipeline (41), the spray head (42) is provided with a spray opening (42a), the spray opening (42a) and at least part of the through hole (31b) are arranged oppositely, and the spray opening (42a) is used for spraying cooling liquid to the accommodating cavity (31a) through the through hole (31b) after the hot melting piece (32) is melted.

7. The battery (10) according to claim 6, wherein the through hole (31b) comprises a first through hole (311b) and a second through hole (312b) which are arranged at intervals, the thermal fuse (32) comprises a first thermal fuse (321) and a second thermal fuse (322), the first thermal fuse (321) is arranged to cover the first through hole (311b), and the second thermal fuse (322) is arranged to cover the second through hole (312 b);

one of the first through hole (311b) and the second through hole (312b) is disposed opposite to the spout (42 a).

8. Battery (10) according to claim 6, characterized in that said hot melt (32) is placed against said spray head (42) and covers said spout (42 a).

9. The battery (10) according to claim 6, wherein the cooling liquid has an electrical conductivity p satisfying: rho is more than or equal to 1S/m.

10. The battery (10) according to claim 6, wherein said battery (10) comprises a plurality of said battery cells (30), said duct (41) having a plurality of said spray heads (42), one said spray head (42) being provided for each of said battery cells (30).

11. An electric consumer, characterized in that it comprises a battery (10) according to any one of claims 6 to 10, said battery (10) being intended to provide electric energy.

12. The electric device according to claim 11, wherein the housing (11) comprises a cooling plate (113), the cooling plate (113) abuts against the battery cell (30), the cooling plate (113) has a flow channel for flowing the cooling fluid;

the power utilization device further comprises a liquid storage tank, the liquid storage tank is used for storing the cooling liquid, and the liquid storage tank is communicated with the flow channel and the pipeline (41).

13. A method of manufacturing a battery cell, comprising:

providing a housing (31), wherein the housing (31) is provided with a containing cavity (31a) and a through hole (31b), and the through hole (31b) is communicated with the containing cavity (31a) and the outside of the containing cavity (31 a);

providing a hot melt (32), the melting point T of the hot melt (32) satisfying: t is more than or equal to 70 ℃ and less than or equal to 200 ℃;

the equipment shell (31) with hot melt (32), wherein, hot melt (32) connect in shell (31), and cover through-hole (31b) set up, hot melt (32) are used for completely cutting off hold chamber (31a) with hold the outside in chamber (31a), through-hole (31b) are used for after hot melt (32) melt as to hold chamber (31a) injection cooling liquid's passageway.

14. A system (100) for manufacturing a battery cell, comprising:

a first providing module (110) for providing a housing (31), the housing (31) having a receiving chamber (31a) and a through hole (31b), the through hole (31b) communicating the receiving chamber (31a) and the outside of the receiving chamber (31 a);

a second providing module (120) for providing a hotmelt (32), the hotmelt (32) having a melting point T satisfying: t is more than or equal to 70 ℃ and less than or equal to 200 ℃;

an assembly module (130) for assembling the outer shell (31) with hot melt piece (32), wherein, hot melt piece (32) connect in outer shell (31), and cover through-hole (31b) set up, hot melt piece (32) are used for completely closing hold chamber (31a) with hold the outside of chamber (31a), through-hole (31b) are used for after hot melt piece (32) melt as to hold the passageway that chamber (31a) injected the coolant liquid.