CN221427848U

CN221427848U - Battery monomer, battery and power consumption device

Info

Publication number: CN221427848U
Application number: CN202420957856.7U
Authority: CN
Inventors: 林秀杰
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-05-07
Filing date: 2024-05-07
Publication date: 2024-07-26
Anticipated expiration: 2034-05-07

Abstract

The application belongs to the technical field of batteries, and particularly relates to a battery monomer, a battery and an electric device. The battery monomer includes electrode assembly, first casing and second casing, first casing sets up in the second casing, electrode assembly sets up in first casing, second casing and first casing sealing connection, form between the lateral wall of second casing and the lateral wall of first casing and hold the chamber and hold heat transfer medium, heat transfer medium contacts with the lateral wall of first casing, the heat that electrode assembly produced can be through the lateral wall conduction of first casing to heat transfer medium in the use, heat transfer medium absorbs heat, thereby dispel the heat, the heat that electrode assembly produced can be through the side of first casing effluvium, the radiating area increases, the heat conduction efficiency is higher, the radiating rate is faster, the radiating effect can effectively promote, the thermal runaway risk of battery monomer reduces, the thermal runaway risk of battery that uses this battery monomer to make also can correspondingly reduce.

Description

Battery monomer, battery and power consumption device

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a battery monomer, a battery and an electric device.

Background

The temperature of the battery is the most important parameter affecting the service performance of the battery, and how to quickly dissipate heat generated in the working process of the battery is the research focus in the current battery design process.

The battery cell is the smallest unit of the composition battery, and when heat dissipation of single or multiple battery cells is not timely enough to cause thermal runaway, the battery cell can be diffused to adjacent battery cells through a heat dissipation channel, so that the battery cell with large area is overheated and even fires and explodes.

The statements made above merely serve to provide background information related to the present disclosure and may not necessarily constitute prior art.

Disclosure of utility model

The aim of the embodiment of the application is that: provided are a battery cell, a battery and an electricity utilization device, including but not limited to solving the technical problem that the battery is out of control due to untimely heat dissipation of the battery cell.

The technical scheme adopted by the embodiment of the application is as follows:

in a first aspect, a battery cell is provided, the battery cell comprising:

an electrode assembly;

A first case in which the electrode assembly is disposed; wherein the method comprises the steps of

The second shell is in sealing connection with the first shell, the side wall of the first shell and the side wall of the second shell are arranged at intervals and form a containing cavity, at least part of the space of the containing cavity is internally provided with a heat exchange medium, and the heat exchange medium is in contact with the first shell and is used for exchanging heat generated by the electrode assembly.

According to the battery cell, the second shell is arranged outside the first shell, the accommodating cavity is formed between the second shell and the first shell to accommodate the heat exchange medium, the electrode assembly is arranged in the first shell, the heat exchange medium is in contact with the side wall of the first shell, heat generated by the electrode assembly in the use process can be transferred to the heat exchange medium through the side wall of the first shell, and the heat exchange medium absorbs the heat, so that heat can be dissipated, therefore, the heat generated by the electrode assembly can be dissipated through the end face of the first shell, and can be dissipated through the side face of the first shell, namely, a large face of the first shell, the heat dissipation area is increased, the large face of the first shell accommodating the electrode assembly is directly in contact with the heat exchange medium, the heat conduction efficiency is higher, the heat dissipation speed is higher, the heat dissipation effect is effectively improved, the thermal runaway risk of the battery cell manufactured by using the battery cell is correspondingly reduced. And, use the battery that the battery monomer stacks into groups of this embodiment makes, can utilize the clearance between the adjacent battery monomer to set up foretell second casing, so, can utilize the clearance between the adjacent battery monomer to dispel the heat, when improving the radiating effect, still improved the inside space utilization of battery, battery performance can promote.

In some embodiments, the height of the second housing is equal to or less than the height of the first housing, the second housing being disposed on a side of the first housing.

Through adopting the technical scheme of this embodiment, the second casing sets up the lateral part at first casing, and the high height that does not exceed first casing of second casing, like this, the setting of second casing can not increase the size in the battery monomer direction of height, the in-process that forms the battery at the battery monomer constitution, can not increase the whole height of battery, and can utilize the clearance between the battery monomer to set up the second casing, through designing the shape and the size of second casing, the setting of second casing also can not increase the lateral dimension of battery, so, on the basis of improving radiating efficiency, can not obviously lead to the battery volume increase.

In some embodiments, the second housing is provided with a liquid inlet hole, and the liquid inlet hole is communicated with the part of the containing cavity containing the heat exchange medium and is used for injecting the heat exchange medium into the containing cavity.

By adopting the technical scheme of the embodiment, the liquid inlet is arranged to inject the heat exchange medium into the containing cavity, so that the heat exchange medium enters the containing cavity, and the heat exchange medium can be sealed in the containing cavity after the liquid inlet is plugged.

In some embodiments, the second housing further has a liquid outlet, and the liquid outlet is communicated with the portion of the cavity containing the heat exchange medium and is used for discharging the heat exchange medium in the cavity.

Through adopting the technical scheme of this embodiment, set up the heat transfer medium that goes out the liquid hole and discharge in the appearance chamber, like this, heat transfer medium gets into appearance chamber rethread liquid hole through the feed liquor hole and discharges the appearance chamber, when battery monomer was made into the battery, can be with the feed liquor hole with go out the pipeline intercommunication that is arranged in the heat transfer system of liquid hole and battery to circulate heat transfer medium, like this, heat transfer medium in the appearance chamber just can establish heat transfer circulation with heat transfer system to accelerate the heat dissipation, further improve the radiating effect.

In some embodiments, one of the liquid inlet and the liquid outlet is disposed at one end of the second housing in the height direction, and the other of the liquid inlet and the liquid outlet is disposed at the opposite end of the second housing in the height direction.

Through adopting the technical scheme of this embodiment, like this, after the heat transfer medium flow circulation is established to the heat transfer system of battery monomer and battery, set up feed liquor hole and play liquid hole in the second casing along the relative both ends of direction of height, the flow of heat transfer medium in holding the intracavity is longer, and the heat transfer medium is longer through the route that gets into to discharging the flow from the liquid hole from the feed liquor hole, and the heat transfer is more ensured.

In some embodiments, the second housing includes a top case and a bottom case disposed opposite to each other along a height direction, and a side case connected between the top case and the bottom case, wherein sidewalls of the top case, the side case, the bottom case, and the first housing enclose a cavity, one of the liquid inlet and the liquid outlet is disposed on the top case, and the other of the liquid inlet and the liquid outlet is disposed on the bottom case.

Through adopting the technical scheme of this embodiment, with the top shell sealing connection of top shell and the first casing of second casing, with the drain pan sealing connection of drain pan and the first casing of second casing, alright form the appearance chamber between the lateral wall of first casing and the lateral wall of second casing, second casing simple structure can adopt connection technique such as welding to realize sealing connection with first casing, connect easy operation.

In some embodiments, the accommodating cavity comprises at least one first cavity and at least one second cavity which are independent from each other, the heat exchange medium is accommodated in the first cavity, the electrolyte is accommodated in the second cavity, a one-way valve is arranged on the part of the first shell, which is positioned in the second cavity, and the one-way valve conducts the electrolyte from the second cavity to the inside of the first shell in a one-way.

Through adopting the technical scheme of this embodiment, divide into independent first cavity and second cavity with holding the chamber, holding heat transfer medium is used for the heat dissipation in the first cavity, hold electrolyte in the second cavity, and set up the one-way electrolyte that switches on in first casing to first casing at first casing, like this, when electrode assembly takes place thermal expansion and resumes the inside pressure reduction of cooling back first casing, electrolyte in the second cavity just can get into in the first casing through the one-way valve, thereby reach the purpose of replenishing electrolyte to electrode assembly, thereby realize through timely replenishing electrolyte in order to improve electrode assembly's wholeness ability.

In some embodiments, the second housing is further provided with a liquid injection hole in communication with the second cavity and for injecting electrolyte into the second cavity.

By adopting the technical scheme of the embodiment, the liquid injection hole is arranged for injecting the electrolyte into the second cavity, and the electrolyte can be injected together in the liquid injection stage in the production process of the battery monomer.

In some embodiments, the second housing is a square housing, a regular triangle housing, and a regular hexagon housing.

Through adopting the technical scheme of this embodiment, set up the second casing into square casing, regular triangle casing or the arbitrary kind in the regular hexagon casing, the in-process of battery monomer group preparation battery, the second casing homoenergetic is directly piled up, and battery group efficiency is higher, under the prerequisite that satisfies heat dissipation and insulation, can hardly set up the clearance between the adjacent battery monomer, and battery structure is compacter.

In some embodiments, the first housing is a circular housing, the diameter of the inscribed circle of the second housing is equal to the outer diameter of the first housing, the side walls of the first housing are in sealing connection with the positions of the side walls of the second housing, and the four corner spaces of the second housing form the accommodating cavity.

Through adopting the technical scheme of this embodiment, the setting of second casing is equivalent to increasing a square casing in the free outside of cylindrical battery, compares and directly uses a plurality of cylindrical battery monomer to make the battery in groups, and the clearance between two adjacent cylindrical battery monomer has effectually been utilized in the setting of square second casing dispels the heat, also can not lead to the battery volume to obviously increase because of setting up the second casing when improving the radiating effect.

In some embodiments, the sidewall of the second housing is an insulating wall.

Through adopting the technical scheme of this embodiment, set up the lateral wall of second casing as the insulating wall, after making the battery in groups, even the second casing of adjacent battery monomer contacts each other, also can not take place the short circuit, battery performance is more reliable and stable.

In some embodiments, the first housing is provided with a pressure relief valve located outside the second housing; and/or the second shell is provided with a pressure relief hole, and the pressure relief valve is opposite to the pressure relief hole.

Through adopting the technical scheme of this embodiment, with the free relief valve setting of battery outside the second casing, perhaps set up the relief hole in the position that the second casing corresponds the relief valve, electrode assembly is overheated and when leading to the first casing to take place to expand to the expansion limit value that surpasses first casing can bear, the heat in the first casing can directly release outside the second casing through the relief valve, perhaps through the steam that the relief valve released can release outside the second casing through the relief hole to make the free relief of battery, reduce the overheated risk of explosion that takes place for the battery.

In a second aspect, a battery is provided, comprising the battery cell of the above embodiment.

According to the battery provided by the embodiment of the application, through the adoption of the battery unit, the battery unit can radiate heat through the end face, and also can radiate heat through the side face, namely the large face of the battery unit, so that the radiating area is increased, the radiating speed is higher, the radiating effect is effectively improved, and the thermal runaway risk of the battery is reduced. And the gaps between adjacent battery monomers are utilized for heat dissipation, so that the heat dissipation effect is improved, the space utilization rate inside the battery is also improved, and the battery performance is improved.

In some embodiments, the battery is further provided with a heat exchange pipeline, and the space of the accommodating cavity containing the heat exchange medium is communicated with the heat exchange pipeline.

By adopting the technical scheme of the embodiment, the space of the accommodating cavity, which accommodates the heat exchange medium, is communicated with the heat exchange pipeline, and the heat exchange medium in the accommodating cavity can establish heat exchange circulation through the heat exchange pipeline, so that heat dissipation is accelerated, and the heat dissipation effect is further improved.

In some embodiments, the heat exchange pipeline is provided with a plurality of liquid outlets and a plurality of liquid inlets, the liquid outlets are communicated with the plurality of containing cavities in one-to-one correspondence, and the liquid inlets are communicated with the plurality of containing cavities in one-to-one correspondence.

Through adopting the technical scheme of this embodiment, the heat exchange pipeline is through a plurality of liquid outlets with the heat transfer medium input each battery monomer hold intracavity, and the heat transfer medium of each battery monomer holds intracavity again can reentry the heat exchange pipeline through each corresponding inlet, so, can realize the circulation of heat transfer medium between heat exchange pipeline and each battery monomer holds the chamber.

In some embodiments, the heat exchange tubing is provided at the top and/or bottom of the battery cell.

Through adopting the technical scheme of this embodiment, set up the heat transfer pipeline in the free tip of battery, the heat transfer pipeline can with the free terminal surface contact heat transfer of battery, so, the heat transfer pipeline dispels the heat to the free terminal surface of battery, holds the heat transfer medium in the chamber and dispels the heat to the free big face of battery, and the radiating effect is better, helps further reducing the risk of battery thermal runaway, and battery stability in use promotes.

In some embodiments, the battery further comprises an integrated busbar, the battery cells are electrically connected with the integrated busbar, and the heat exchange pipeline is embedded in the integrated busbar.

Through adopting the technical scheme of this embodiment, the heat exchange pipeline is inlayed in the female row of integration to the female row of integration and battery monomer converging, need not to set up extra bearing structure and install the heat exchange pipeline to can save the inner space of battery, the integration installation of heat exchange pipeline and the female row of integration of also being convenient for.

In some embodiments, the integrated busbar has an outer surface facing away from the battery cells, and the heat exchange circuit is disposed so as not to extend beyond the outer surface of the integrated busbar.

Through the technical scheme of the embodiment, the heat exchange pipeline can not protrude from the surface of the integrated busbar, so that the heat exchange pipeline can be installed by utilizing the height of the integrated busbar as much as possible, the height dimension of the battery is reduced, and the volume of the battery is reduced.

In a third aspect, an electrical device is provided, comprising a battery cell and/or a battery of the above embodiments.

According to the power utilization device provided by the embodiment of the application, the battery monomer and/or the battery are adopted, so that the risk of thermal runaway of the battery monomer and/or the battery in the power utilization device is reduced, and the use stability and reliability of the power utilization device are improved.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a vehicle according to an embodiment of the present application;

fig. 2 is an exploded view of a battery provided in 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 another view from another perspective of the battery cell shown in fig. 3;

fig. 5 is a further view from the perspective of the battery cell shown in fig. 3;

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

FIG. 7 is a cross-sectional view taken along line B-B of FIG. 5;

Fig. 8 is a schematic structural diagram of a battery according to an embodiment of the present application;

Fig. 9 is an exploded view of the battery shown in fig. 8;

FIG. 10 is a schematic view of a portion of the structure of the battery case shown in FIG. 8;

FIG. 11 is a cut-away view of the structure shown in FIG. 10;

FIG. 12 is an enlarged view at A in FIG. 11;

FIG. 13 is a schematic view of an assembled structure of the heat exchange tubes and the integrated busbar of the battery shown in FIG. 8;

FIG. 14 is a schematic view of the assembled structure of the heat exchange tube and the bracket of the battery shown in FIG. 8;

Fig. 15 is a cross-sectional view showing a structure in which a heat exchange pipe of the battery shown in fig. 8 is fitted in an integrated busbar.

Wherein, each reference sign in the figure:

1. A battery; 2. a controller; 3. a motor;

10. A case; 11. a first portion; 12. a second portion;

20. A battery cell; 21. an electrode assembly; 22. a first housing; 221. a one-way valve; 23. a second housing; 231. a positive electrode terminal; 232. a negative electrode terminal; 233. a liquid inlet hole; 234. a liquid outlet hole; 235. a liquid injection hole; 236. a top shell; 237. a bottom case; 238. a side shell; 239. a pressure relief hole; 24. a cavity; 241. a first cavity; 242. a second cavity;

30. A heat exchange pipeline; 31. a liquid outlet; 32. a liquid inlet; 33. a junction pipe;

40. an integrated busbar;

50. And (3) a bracket.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the present application is further described in detail below with reference to fig. 1 to 15 and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

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

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

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

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

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two). The meaning of "a number" is one or more than one unless specifically defined otherwise.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.

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

In the description of embodiments of the application, when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element unless explicitly stated and limited otherwise. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

In the related art, the battery generally can include the box and set up a plurality of battery monomers in the box, in order to dispel the heat to the battery, still need set up heat transfer system in the box generally, heat transfer system includes the liquid cooling board, the hot cold board sets up in the free opposite both ends of battery, for example the liquid cooling board sets up at the top and the bottom of box, the liquid cooling board realizes the heat transfer with free terminal surface contact of battery, in such battery, the heat that the battery monomer produced is conducted through the terminal surface, heat transfer area is limited, the heat transfer inefficiency, especially the heat of the free big face of battery also need be conducted to the terminal surface again and realize heat exchange with the liquid cooling board, heat transfer time is long, the battery monomer still has the risk that thermal runaway appears because of the heat dissipation is untimely.

In other schemes, can also adopt the submergence cooling mode to dispel the heat to the battery monomer, fill the coolant liquid in the inside of box promptly, the battery monomer submergence is in the cooling, and this kind of submergence cooling mode is extremely high to the sealed requirement of box, needs to set up a large amount of supports and sealing washer or sealant in order to guarantee sealed effect, and the structural design degree of difficulty of box is big to other structures that can not contact with the coolant liquid in the box also do waterproofing, and battery overall manufacturing cost increases, still is difficult to guarantee the overall stability of battery.

Based on this, the embodiment of the application provides a battery cell, through setting up the second casing in the outside of the first casing of parcel electrode assembly, and set up appearance chamber Rong Zhihuan thermal medium between second casing and first casing, the heat that the electrode assembly produced can be through the lateral wall conduction of first casing to the heat exchange medium during the use, the heat exchange medium absorbs heat, thereby dispel the heat, so, the heat that the electrode assembly produced can not only dispel through the terminal surface of first casing and second casing, also can dispel through the side of first casing i.e. big face, the radiating area increases, and be used for holding the big face of the first casing of electrode assembly and direct contact with the heat exchange medium, the heat conduction efficiency is higher, the radiating rate is faster, the radiating effect can effectively promote, the thermal runaway risk of battery cell's that uses this battery cell to make also can correspondingly reduce.

The technical scheme described by the embodiment of the application is suitable for battery monomers, batteries and power utilization devices using the batteries.

Batteries are widely used in various electronic devices including cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like. A battery is a device capable of storing electric energy and discharging electric energy, and supplying the electric power required for these electronic devices. The battery may also be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. Spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others.

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

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the application. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like. The interior of the vehicle is provided with a battery 1, and the battery 1 may be provided at the bottom or at the head or at the tail of the vehicle. The battery 1 is used to supply power to the vehicle, for example, the battery 1 may serve as an operating power source for the vehicle. The vehicle may further comprise a controller 2 and a motor 3, the controller 2 being arranged to control the battery 1 to power the motor 3, for example for starting, navigating and operating power requirements of the vehicle.

In the embodiment of the application, the battery 1 can be used as an operating power supply of a vehicle, and can also be used as a driving power supply of the vehicle to supply driving power for the vehicle instead of or in part of fuel oil or natural gas.

Referring to fig. 2, as an embodiment of the battery, the battery includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end opened, the first portion 11 may be a plate-shaped structure, and the first portion 11 covers the opening side of the second portion 12, so that the first portion 11 and the second portion 12 together define a containing space; the first portion 11 and the second portion 12 may be hollow structures each having an opening at one side, and the opening side of the first portion 11 is engaged with the opening side of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, portions of the tank may be part of the floor of the vehicle, or portions of the tank may be part of the cross and side rails of the vehicle.

As another example of the battery, the battery may not include the case, but a plurality of battery cells may be electrically connected and integrated by a necessary fixing structure to be assembled into the power consumption device.

In the battery, a plurality of battery monomers can be connected in series or in parallel or in series-parallel connection, and the series-parallel connection means that the plurality of battery monomers are connected in series or in parallel.

In one embodiment, the plurality of battery cells can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells is accommodated in the box body; of course, the battery can also be in a form of a battery module formed by connecting a plurality of battery monomers in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole body and accommodating the whole body in the box body. The battery may further include other structures, for example, a bus member for making electrical connection between the plurality of battery cells.

Wherein each battery cell may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped.

The battery cell in the embodiment of the application includes an electrode assembly and a case in which the electrode assembly is mounted to protect the electrode assembly through the case.

The electrode assembly consists of a positive plate, a negative plate and a diaphragm. The electrode assembly operates primarily by means of metal ions moving between the positive and negative electrode sheets. The positive plate comprises a positive current collector and a positive active material layer, wherein the positive active material layer is coated on the surface of the positive current collector, a part of the positive current collector, which is not coated with the positive active material layer, protrudes out of the part, which is coated with the positive active material layer, of the positive current collector, and the part, which is not coated with the positive active material layer, is used as a positive electrode lug, or a metal conductor is welded and led out of the positive current collector to be used as the 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 electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the part of the negative electrode current collector, which is not coated with the negative electrode active material layer, protrudes out of the part, which is coated with the negative electrode active material layer, of the negative electrode current collector, and the part, which is not coated with the negative electrode active material layer, is used as a negative electrode tab, or a metal conductor is welded and led out of the negative electrode current collector to be used as the negative electrode tab. 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 high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. It is understood that in the electrode assembly, the number of positive electrode tabs may be one, and the number of negative electrode tabs may be one. That is, two groups of tabs are provided on the electrode assembly, each group includes at least one tab, one group of tabs is a positive tab, and the other group of tabs is a negative tab.

The electrode assembly may be a rolled structure or a laminated structure. The embodiments of the present application are not limited thereto. The winding structure is characterized in that the lugs are welded on the current collector and are arranged in sequence from the positive plate to the diaphragm to the negative plate to the diaphragm; and winding to form a cylindrical or square battery cell. The lamination structure is characterized in that a tab is led out of a current collector, a positive plate, a negative plate and a diaphragm are arranged in sequence from the positive plate to the diaphragm to the negative plate to the diaphragm, and laminated cells are formed by lamination layer by layer; wherein the membrane may be cut and laminated directly with the membrane sheet, or the membrane may not be cut and laminated with a Z-fold. The separator may be made of PP (Polypropylene) or PE (Polyethylene). The diaphragm is the insulating film of setting between positive plate and negative plate, and its main roles are: the positive electrode and the negative electrode are isolated, electrons in the battery cannot pass through freely, short circuit is prevented to a certain extent, and ions in the electrolyte can pass through freely between the positive electrode and the negative electrode, so that a loop is formed between the positive electrode and the negative electrode. The positive and negative electrode sheets are collectively referred to as a pole sheet. The positive electrode tab and the negative electrode tab are collectively referred to as tabs.

The case means a case structure having a space therein to accommodate and protect the electrode assembly. The shell can be made of materials with certain hardness and strength, so that the shell is not easy to deform when being extruded and collided, the battery unit can have higher structural strength, and the reliability can be improved. The material of the housing may be various, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

Electrode terminals are provided on the outer case of the battery cell. The electrode terminal is a conductive member provided on the case, and is connected to a tab of the electrode assembly to output electric energy of the battery cell or charge the battery cell. The battery cell has two electrode terminals, the two electrode terminals are respectively connected with the positive electrode lug and the negative electrode lug of the electrode assembly, the electrode terminal connected with the positive electrode lug is a positive electrode terminal, and the electrode terminal connected with the negative electrode lug is a negative electrode terminal. The electrode assembly is connected with the electrode terminals to form a battery cell.

When the battery cell is charged, the current converts the electrical energy into chemical energy through a chemical reaction between the electrolyte and the electrode, which is stored in the battery cell. And during discharge, chemical energy is converted into electrical energy for release. This energy conversion process is accompanied by energy loss and heat generation, which can lead to overheating of the battery cells if the heat is not efficiently dissipated inside the battery cells. Certain internal resistance exists in the battery cell, and resistance loss can be generated when current passes through the internal resistance, so that the battery cell generates heat. When the current is too high or the internal resistance is too high, heat generation inside the battery cells is increased, resulting in overheating of the battery cells. If the maximum voltage of the cell design is exceeded during charging or the cell voltage drops too low during discharging, over-voltage or over-discharge of the cell can result. Overcharging or overdischarging can cause a chemical reaction inside the battery cell to run away, generating excessive heat, resulting in overheating of the battery cell.

Hereinafter, the battery cell according to the present application will be described in detail with reference to fig. 3 to 7 and fig. 9 to 13, and specific examples thereof. Fig. 3 to fig. 7 correspond to diagrams of a battery cell according to an embodiment of the present application, and fig. 8 to fig. 13 are diagrams of a battery made using the battery cell according to the embodiment of the present application.

In the embodiment of the present application, as shown in fig. 4 to 7, the battery cell 20 includes an electrode assembly 21, a first case 22 and a second case 23, the electrode assembly 21 is disposed in the first case 22, the first case 22 is disposed in the second case 23, wherein the second case 23 is hermetically connected with the first case 22, a side wall of the first case 22 is spaced from a side wall of the second case 23 and forms a cavity 24, and at least a part of the space of the cavity 24 accommodates a heat exchange medium, which is in contact with the first case 22 and is used for exchanging heat generated by the electrode assembly 21.

As can be appreciated, in the present embodiment, as shown in fig. 3, 4 and 6, the electrode assembly 21 being disposed in the first case 22 means that the electrode assembly 21 is accommodated in the inner space of the first case 22, and the first case 22 serves to accommodate and protect the electrode assembly 21. The first casing 22 may be made of a material with a certain hardness, strength and heat conducting capability, so that the first casing 22 is not easy to deform, so that the electrode assembly 21 can be reliably protected, and the first casing 22 has a good heat conducting capability, so that heat can be quickly exchanged with the heat exchange medium in the cavity 24, and the dissipation of heat inside the first casing 22 is accelerated. For example, the material of the first housing 22 includes, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

As can be appreciated, in the present embodiment, as shown in fig. 3, 4 and 6, the first housing 22 is disposed in the second housing 23, which means that the second housing 23 has an accommodating space, the first housing 22 is accommodated in the accommodating space of the second housing 23, and the second housing 23 partially or completely surrounds the first housing 22 from the outside. The second casing 23 may be made of a material with a certain hardness and strength, so that the second casing 23 is not easy to deform when being extruded and collided, so that the battery cell 20 can have a higher structural strength, and the reliability can be improved. The material of the second housing 23 may be various, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, ceramic, glass, plastic, and polyester ammonia.

As can be understood, as shown in fig. 6 and 8, the side wall of the first housing 22 refers to a wall surface provided between opposite end surfaces of the first housing 22 in the height direction of the first housing 22; the side wall of the second housing 23 is a wall surface provided between opposite end surfaces of the second housing 23 in the height direction of the second housing 23. The height direction of the first housing 22 refers to the direction indicated by the double arrow F in fig. 5.

The sealed connection of the second housing 23 and the first housing 22 means that the connection position of the first housing 22 and the second housing 23 is sealed, so that a cavity 24 is formed between the first housing 22 and the second housing 23, and the heat exchange medium in the cavity 24 cannot leak from the connection position of the first housing 22 and the second housing 23. The second housing 23 may be welded to the first housing 22, for example, by laser penetration welding, etc., while sealing, or the second housing 23 may be snapped or fastened to the first housing 22 and sealed by injecting glue at the interface.

As can be appreciated, as shown in fig. 6 and 8, the side wall of the first case 22 being spaced apart from the side wall of the second case 23 and forming the receiving cavity 24 means that the first case 22 is located inside the second case 23, the side wall of the second case 23 is disposed at the side of the side wall of the first case 22 in the circumferential direction of the first case 22, and the side wall of the second case 23 surrounds the side wall of the first case 22 and is spaced apart from the side wall of the first case 22, thereby forming a cavity between the side wall of the second case 23 and the side wall of the first case 22, the cavity correspondingly forming the receiving cavity 24 to receive the heat medium. At least part of the space of the accommodating cavity 24 is provided with a heat exchange medium, and part of the space of the accommodating cavity 24 is provided with the heat exchange medium, or all the space of the accommodating cavity 24 is filled with the heat exchange medium.

It will be appreciated that in particular embodiments, the heat exchange medium is a medium capable of conducting heat, such as a cooling liquid, water or air, or the like.

According to the battery cell 20 of the embodiment of the application, the second shell 23 is arranged outside the first shell 22, the heat exchange medium is contained in the cavity 24 formed between the side wall of the second shell 23 and the side wall of the first shell 22, the electrode assembly 21 is arranged in the first shell 22, the heat exchange medium is in contact with the side wall of the first shell 22, heat generated by the electrode assembly 21 in the using process can be conducted to the heat exchange medium through the side wall of the first shell 22, and the heat exchange medium absorbs the heat, so that heat dissipation is carried out, therefore, the heat generated by the electrode assembly 21 can be conducted through the end surfaces of the first shell 22 and the second shell 23 and the heat exchange system of the battery, such as a liquid cooling plate of the heat exchange system, and the heat dissipation area can be increased through the side surface of the first shell 22, namely the large surface of the first shell 22 is directly contacted with the heat exchange medium in the cavity 24, the heat conduction efficiency is higher, the heat dissipation speed is faster, the heat dissipation effect is effectively improved, and the thermal runaway risk of the battery manufactured by the battery cell 20 can be correspondingly reduced.

In addition, referring to fig. 9, 10 and 12 together, compared with stacking conventional battery cells 20, the battery cells 20 of the present embodiment stacked in groups can use the gaps between the conventional battery cells 20 to provide the second housing 23, for example, when the cylindrical battery cells 20 are used for manufacturing the battery in groups, the gaps between the adjacent battery cells 20 can be provided due to the cylindrical housing of the cylindrical battery cells 20, so that the gaps can be used to provide the second housing 23, thereby using the gaps between the adjacent battery cells 20 to dissipate heat, improving the heat dissipation effect, and simultaneously improving the space utilization rate of the battery and the battery performance. In addition, compare and directly fill heat transfer medium inside box 10, with second casing 23 and first casing 22 sealing connection, the structural seal design degree of difficulty reduces, sealing connection's reliability is higher, and the heat transfer medium can not be contacted to other structures that can not contact with heat transfer medium in the battery inside yet, and the holistic stability in use and the reliability of battery promote.

In some embodiments, as shown in fig. 3, 4 and 6, the second case 23 is further provided with a positive terminal 231 and a negative terminal 232, the positive terminal 231 is electrically connected with the positive tab of the electrode assembly 21, and the negative terminal 232 is electrically connected with the negative tab of the electrode assembly 21. Thus, to output the electric power of the battery cell 20 or to charge the battery cell 20. The positive electrode terminal 231 and the negative electrode terminal 232 are conductive members provided on the first housing 22 or the second housing 23, and the positive electrode terminal 231 and the negative electrode terminal 232 are respectively connected to the positive electrode tab and the negative electrode tab of the electrode assembly 21 to output the electric energy of the battery cell 20 or charge the battery cell 20.

In a specific embodiment, a protruding column may be disposed on the second housing 23 and electrically connected to the positive electrode tab to form the positive electrode terminal 231, or the protruding column may be electrically connected to the negative electrode tab to form the negative electrode terminal 232, or the protruding column may be directly used as the positive electrode terminal 231 or the negative electrode terminal 232 on the end surface of the second housing 23. Illustratively, the end of the second case 23 is provided with a boss that is electrically connected with the positive electrode tab of the electrode assembly 21 and forms a positive electrode terminal 231, and one of end surfaces of opposite ends of the second case 23 is electrically connected with the negative electrode tab of the electrode assembly 21, thereby forming a negative electrode terminal 232.

In some embodiments, as shown in fig. 6 and 7, the height of the second housing 23 is equal to or less than the height of the first housing 22, and the second housing 23 is provided at a side portion of the first housing 22 and is hermetically connected to the first housing 22.

In this embodiment, the second housing 23 is disposed on the side of the first housing 22, and the height of the second housing 23 does not exceed the height of the first housing 22, so that the size of the second housing 23 in the height direction of the battery cells 20 is not increased, the overall height of the battery is not increased in the process of forming the battery by the battery cells 20, the second housing 23 can be disposed by using the gap between the battery cells 20, and the lateral size of the battery is not increased by designing the shape and size of the second housing 23, so that the size of the battery is not increased, and the increase of the battery volume is not significantly caused on the basis of improving the heat dissipation efficiency.

In some embodiments, as shown in fig. 3, 5 and 6, the second housing 23 is provided with a liquid inlet 233, and the liquid inlet 233 is in communication with the portion of the cavity 24 containing the heat exchange medium and is used for injecting the heat exchange medium into the cavity 24.

In this way, the heat exchange medium is injected into the cavity 24 by providing the liquid inlet 233, so that the heat exchange medium enters the cavity 24, and the heat exchange medium can be sealed in the cavity 24 after the liquid inlet 233 is plugged.

In some embodiments, as shown in fig. 4, 6 and 7, the second housing 23 is further provided with a liquid outlet 234, and the liquid outlet 234 communicates with the portion of the cavity 24 containing the heat exchange medium and is used for discharging the heat exchange medium in the cavity 24.

In this embodiment, the liquid outlet 234 is provided to discharge the heat exchange medium in the cavity 24, so that the heat exchange medium enters the cavity 24 through the liquid inlet 233 and then is discharged out of the cavity 24 through the liquid outlet 234, and when the battery cells 20 are assembled into a battery, as shown in fig. 8, 10 and 11, the liquid inlet 233 and the liquid outlet 234 can be communicated with the pipeline for circulating the heat exchange medium in the heat exchange system of the battery, so that the heat exchange medium in the cavity 24 can establish a heat exchange cycle with the heat exchange system of the battery, thereby accelerating heat dissipation and further improving the heat dissipation effect.

In some embodiments, as shown in fig. 3, 4 and 6, one of the liquid inlet 233 and the liquid outlet 234 is provided at one end of the second housing 23 in the height direction, and the other of the liquid inlet 233 and the liquid outlet 234 is provided at the opposite end of the second housing 23 in the height direction.

Illustratively, the second housing 23 has a top surface and a bottom surface disposed opposite to each other along a height direction, the liquid inlet 233 is disposed on the top surface of the second housing 23, the liquid outlet 234 is disposed on the bottom surface of the second housing 23, or the liquid outlet 234 is disposed on the top surface of the second housing 23, and the liquid inlet 233 is disposed on the bottom surface of the second housing 23. The height direction of the second housing 23 is the direction indicated by the double arrow F in fig. 6.

In this embodiment, when the battery 20 and the heat exchange system of the battery establish a heat exchange medium flow cycle, the liquid inlet holes 233 and the liquid outlet holes 234 are disposed at two opposite ends of the second housing 23 along the height direction, the flow path of the heat exchange medium in the cavity 24 is longer, the flow path of the heat exchange medium from the liquid inlet holes 233 to the liquid outlet holes 234 is longer, and heat exchange is more ensured.

In an embodiment, as shown in fig. 3, 4, and 6 and 7, the second housing 23 includes a top case 236 and a bottom case 237 disposed opposite to each other in a height direction, and a side case 238 connected between the top case 236 and the bottom case 237, the side walls of the top case 236, the side case 238, the bottom case 237, and the first housing 22 enclose a cavity 24, one of the liquid inlet 233 and the liquid outlet 234 is disposed in the top case 236, and the other of the liquid inlet 233 and the liquid outlet 234 is disposed in the bottom case 237.

In this way, the top shell 236 of the second casing 23 is connected with the first casing 22 in a sealing manner, the bottom shell 237 of the second casing 23 is connected with the first casing 22 in a sealing manner, the cavity 24 can be formed between the side wall of the first casing 22 and the side wall of the second casing 23, the second casing 23 has a simple structure, and the connection technology such as welding and the like can be adopted to realize the sealing connection with the first casing 22, so that the connection operation is simple. In addition, in some battery schemes provided with a liquid cooling plate for radiating heat from the end face of the battery monomer 20, when the battery monomer 20 of the embodiment is used, the top shell 236 and the bottom shell 237 of the second shell 23 are arranged opposite to the liquid cooling plate, so that the top shell 236 of the second shell 23 is provided with the liquid inlet 32, and the bottom shell 237 of the second shell 23 is provided with the liquid outlet 31, the liquid cooling plate can be communicated with the liquid inlet 233 through the short connecting pipe 33, and the battery monomer 20 is convenient to be connected with a heat exchange system of a battery, so that the battery monomer has higher practicability.

In some embodiments, as shown in fig. 6 and 7, the accommodating cavity 24 includes at least one first cavity 241 and at least one second cavity 242 that are independent from each other, the heat exchange medium is accommodated in the first cavity 241, the electrolyte is accommodated in the second cavity 242, a portion of the first housing 22 located in the second cavity 242 is provided with a one-way valve 221, and the one-way valve 221 conducts the electrolyte unidirectionally from the second cavity 242 to the interior of the first housing 22.

In this embodiment, the accommodating cavity 24 is divided into a first cavity 241 and a second cavity 242, the first cavity 241 is used for accommodating a heat exchange medium for dissipating heat, the second cavity 242 is used for accommodating electrolyte, and the first casing 22 is provided with the one-way valve 221 for one-way conducting the electrolyte into the first casing 22, so that when the electrode assembly 21 thermally expands and returns to cool, the internal pressure of the first casing 22 is reduced, the electrolyte in the second cavity 242 can enter the first casing 22 through the one-way valve 221, thereby achieving the purpose of replenishing the electrolyte to the electrode assembly 21, and further achieving the purpose of improving the overall performance of the electrode assembly 21 by timely replenishing the electrolyte.

It should be noted that, the unidirectional passage of the electrolyte from the second cavity 242 to the inside of the first housing 22 by the unidirectional valve 221 means that the electrolyte in the second cavity 242 can enter the first housing 22 through the unidirectional valve 221, and the electrolyte in the first housing 22 cannot enter the second cavity 242 through the unidirectional valve 221.

In some embodiments, as shown in fig. 7, the second housing 23 is further provided with a liquid injection hole 235, and the liquid injection hole 235 communicates with the second cavity 242 and is used to inject the electrolyte into the second cavity 242.

In this way, the liquid injection hole 235 is provided for injecting the electrolyte into the second cavity 242, and the electrolyte can be injected together at the liquid injection stage in the production process of the battery cell 20.

In some embodiments, the second housing 23 includes a square housing, a regular triangle housing, and a regular hexagon housing.

In the embodiment, as shown in fig. 3, 4, and 6 and 7, the second housing 23 is a square housing. So, set up second casing 23 into square casing, the in-process of battery cell 20 group preparation battery, square second casing 23 can directly pile up, and battery group efficiency is higher, under the prerequisite that satisfies heat dissipation and insulation, can hardly set up the clearance between the adjacent battery cell 20, and battery structure is compacter.

In a specific embodiment, the second housing 23 may also be a regular triangle housing or a regular hexagon housing. The second shell 23 is set to be a regular triangle shell or a regular hexagon shell, in the process of manufacturing the batteries by the battery cells 20 in groups, the regular triangle or regular hexagon second shell 23 can be directly stacked, the battery grouping efficiency is higher, gaps can be hardly arranged between adjacent battery cells 20 on the premise of meeting heat dissipation and insulation, and the battery structure is more compact.

In some embodiments, as shown in fig. 3, 6 and 7, the first housing 22 is a circular housing, the diameter of the inscribed circle of the second housing 23 is equal to the outer diameter of the first housing 22, the side wall of the first housing 22 is in sealing connection with the position where the side wall of the second housing 23 contacts, and the corner space of the second housing 23 forms the accommodating cavity 24.

In this embodiment, compared with directly using a plurality of cylindrical battery cells 20 to make a battery in groups, the second housing 23 is added to the outside of the cylindrical battery cells 20, when the second housing 23 is any one of a square housing, a regular triangle housing or a regular hexagon housing, the arrangement of the second housing 23 can effectively utilize the gap between two adjacent cylindrical battery cells 20 to dissipate heat, and the outer diameter of the first housing 22 is equal to the diameter of the inscribed circle of the second housing 23, and the outer side wall of the first housing 22 contacts with the inner side wall of the second housing 23, so that the battery volume is not obviously increased due to the arrangement of the second housing 23 while the heat dissipation effect is improved. The side wall of the first housing 22 and the side wall of the second housing 23 may be connected in a sealed manner, for example, by laser penetration welding, or by bonding the side wall of the first housing 22 and the side wall of the second housing 23.

It will be appreciated that in particular embodiments, as shown in fig. 6 and 7, the cavity 24 may include one first cavity 241 and one second cavity 242, or the cavity 24 may include one first cavity 241 and a plurality of second cavities 242, or the cavity 24 may also include a plurality of first cavities 241 and one second cavity 242, or the cavity 24 may also include a plurality of first cavities 241 and a plurality of second cavities 242. In actual design, the design can be carried out according to the heat dissipation requirement and the requirement of the accommodation amount of the electrolyte.

Illustratively, the second housing 23 is a triangular housing, and three corner spaces of the second housing 23 form a cavity 24, where the cavity 24 includes two first cavities 241 and one second cavity 242, or where the cavity 24 includes one second cavity 242 and two first cavities 241.

Illustratively, the second housing 23 is a square housing, and four corner spaces of the second housing 23 form the accommodating cavity 24 correspondingly, and the accommodating cavity 24 may include a first cavity 241 and a second cavity 242; or the accommodating cavity 24 may include one first cavity 241 and a plurality of second cavities 242, or the accommodating cavity 24 may include one second cavity 242 and a plurality of first cavities 241, where the plurality may be two or three; still alternatively, the cavity 24 may include two first cavities 241 and two second cavities 242.

In some embodiments, as shown in fig. 3, 4 and 6, the side wall of the second housing 23 is an insulating wall.

In this way, after the side walls of the second housings 23 are set as insulating walls to form the battery, even if the second housings 23 of the adjacent battery cells 20 are in contact with each other, short circuit can not occur between the battery cells 20, and the battery performance is more stable and reliable.

It should be understood that the side wall of the second housing 23 is an insulating wall, for example, the side wall of the second housing 23 may be made of an insulating material, for example, the side wall of the second housing 23 may be made of ceramic, glass, plastic, polyester-ammonia, or the like, or an insulating coating may be applied to an outer wall surface of the side wall of the second housing 23, so that the second housing 23 can be insulated.

In some embodiments, the first housing 22 is provided with a pressure relief valve that is located outside the second housing 23.

In this embodiment, the pressure release valve of the battery cell 20 is disposed outside the second housing 23, and when the electrode assembly 21 is overheated and causes the first housing 22 to expand beyond the expansion limit that the first housing 22 can withstand, the heat in the first housing 22 can be released through the pressure release valve, so that the battery cell 20 is released, and the risk of explosion caused by overheating of the battery cell 20 is reduced.

In other embodiments, as shown in fig. 4, the first housing 22 is provided with a relief valve, and the second housing 23 is provided with a relief hole 239, the relief valve facing the relief hole 239.

In this embodiment, the pressure relief hole 239 is disposed at the position of the second housing 23 corresponding to the pressure relief valve, when the electrode assembly 21 is overheated and causes the first housing 22 to expand beyond the expansion limit value that the first housing 22 can bear, the heat in the first housing 22 can be released through the pressure relief valve, and the released hot air is released outside the second housing 23 through the pressure relief hole 239, so that the battery cell 20 is decompressed, and the risk of explosion caused by overheating of the battery cell 20 is reduced.

Another embodiment of the present utility model also provides a battery including the battery cells 20 provided in the above embodiments, as shown in fig. 8 to 15.

According to the battery of the embodiment, through the adoption of the battery monomer 20, the battery monomer 20 can radiate heat through the end face, and can radiate heat through the side face, namely the large face of the battery monomer 20, so that the radiating area is increased, the radiating speed is faster, the radiating effect is effectively improved, and the thermal runaway risk of the battery is reduced. And, utilize the clearance between the adjacent battery monomer 20 to dispel the heat, when improving the radiating effect, still improved the inside space utilization of battery, battery performance can be promoted.

In some embodiments, as shown in fig. 9, 10, and 12 and 13, the battery is further provided with a heat exchange pipeline 30, and the space of the accommodating cavity 24 accommodating the heat exchange medium is communicated with the heat exchange pipeline 30.

Therefore, the space of the accommodating cavity 24 accommodating the heat exchange medium is communicated with the heat exchange pipeline 30, and the heat exchange medium in the accommodating cavity 24 can establish heat exchange circulation through the heat exchange pipeline 30, so that heat dissipation is accelerated, and the heat dissipation effect is further improved.

In some embodiments, as shown in fig. 9, 10 and 12, the heat exchange line 30 is provided at the top and/or bottom of the battery cell 20.

In specific embodiments, the heat exchange line 30 may be disposed at the top of the battery cell 20, or the heat exchange line 30 may be disposed at the bottom of the battery cell 20, or the heat exchange line 30 may be disposed at both the top and bottom of the battery cell 20.

So, with heat exchange pipeline 30 set up in the free tip of battery 20, heat exchange pipeline 30 can with the free terminal surface contact heat transfer of battery 20, so, heat exchange pipeline 30 dispels the heat to the free terminal surface of battery 20, and the heat exchange medium in the appearance chamber 24 dispels the heat to the free large face of battery 20, and the radiating effect is better, helps further reducing battery thermal runaway's risk, and battery stability in use promotes.

In some embodiments, as shown in fig. 11 to 14, the heat exchange pipeline 30 is provided with a plurality of liquid outlets 31 and a plurality of liquid inlets 32, the plurality of liquid outlets 31 are in one-to-one correspondence with the plurality of cavities 24, and the plurality of liquid inlets 32 are in one-to-one correspondence with the plurality of cavities 24.

In this way, the heat exchange pipeline 30 inputs the heat exchange medium into the accommodating cavities 24 of the battery monomers 20 through the plurality of liquid outlets 31, and the heat exchange medium in the accommodating cavities 24 of the battery monomers 20 can reenter the heat exchange pipeline 30 through the corresponding liquid inlets 32, so that the circulation of the heat exchange medium between the heat exchange pipeline 30 and the accommodating cavities 24 of the battery monomers 20 can be realized.

In a specific embodiment, the top wall of the second housing 23 is provided with a liquid inlet 233 communicated with the cavity 24, the bottom wall of the second housing 23 is provided with a liquid outlet 234 communicated with the cavity 24, the heat exchange pipeline 30 is provided with a plurality of liquid inlets 32 and a plurality of liquid outlets 31, the liquid outlets 31 of the heat exchange pipeline 30 are communicated with the liquid inlets 233 of the battery cells 20 in a one-to-one correspondence manner, the liquid inlets 32 of the heat exchange pipeline 30 are communicated with the liquid outlets 234 of the battery cells 20 in a one-to-one correspondence manner, in this way, heat exchange medium in the heat exchange pipeline 30 can flow into the cavities 24 of the battery cells 20 through different liquid outlets 31, and then the heat exchange medium in the cavities 24 of the battery cells 20 flows out through the liquid outlets 234 and flows into the heat exchange pipeline 30 through the liquid inlets 32 which are communicated with each other, so that flow circulation of the heat exchange medium in the heat exchange pipeline 30 and the cavities 24 is realized.

In a specific embodiment, as shown in fig. 9 and fig. 12 to fig. 15, the liquid outlet 31 and the liquid inlet 32 of the heat exchange pipeline 30 may be respectively connected to the junction pipe 33, and the heat exchange pipeline 30 is communicated with the corresponding liquid inlet 233 or the liquid outlet 234 through the junction pipe 33, so as to realize circulation of the heat exchange medium.

In some embodiments, as shown in fig. 9, 12 and 13, the battery further includes an integrated busbar 40, the battery cells 20 are electrically connected to the integrated busbar 40, and the heat exchange tube 30 is embedded in the integrated busbar 40.

Through adopting the technical scheme of this embodiment, the integrated busbar 40 converges to battery monomer 20, inlays the heat transfer pipeline 30 in the integrated busbar 40, need not to set up extra bearing structure and installs heat transfer pipeline 30 to can save the inner space of battery, also be convenient for the integration installation of heat transfer pipeline 30 and integrated busbar 40. Specifically, the battery cell 20 is electrically connected to the integrated busbar 40 with the positive electrode terminal 231 and the negative electrode terminal 232, thereby achieving the bus bar.

In some embodiments, as shown in fig. 10, 12 and 15, the integrated busbar 40 has an outer surface facing away from the battery cells 20, and the heat exchange tubes 30 are positioned not beyond the outer surface of the integrated busbar 40.

Therefore, the heat exchange pipeline 30 cannot protrude from the surface of the integrated busbar 40, so that the heat exchange pipeline 30 can be installed by utilizing the height of the integrated busbar 40 as much as possible, the height dimension of the battery can be reduced, and the volume of the battery can be reduced.

In some embodiments, as shown in fig. 9, 10 and 12 and 14, a bracket 50 may be further disposed in the battery, and the bracket 50 is used to mount the heat exchange tube 30. For example, an integrated busbar 40 is arranged at the top of the battery, a bracket 50 is arranged at the bottom of the battery, a heat exchange pipeline 30 arranged at the top of the battery is embedded in the integrated busbar 40, and the heat exchange pipeline 30 arranged at the bottom of the battery is arranged on the bracket 50.

In one embodiment of the present application, the battery includes a case 10 and a plurality of battery cells 20 disposed in the case 10, the case 10 includes a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 are mutually covered, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cells 20. The battery cell 20 comprises an electrode assembly 21, a first shell 22 and a second shell 23, wherein the electrode assembly 21 is arranged in the first shell 22, the first shell 22 is arranged in the second shell 23, the second shell 23 is provided with a positive electrode terminal 231 and a negative electrode terminal 232, the positive electrode terminal 231 is electrically connected with a positive electrode tab of the electrode assembly 21, the negative electrode terminal 232 is electrically connected with a negative electrode tab of the electrode assembly 21, the first shell 22 and the second shell 23 are in sealed connection, the side wall of the first shell 22 and the side wall of the second shell 23 are arranged at intervals and form a containing cavity 24, at least part of the space of the containing cavity 24 is filled with heat exchange medium, The heat exchange medium is in contact with the first case 22 and serves to exchange heat generated from the electrode assembly 21. Specifically, the first casing 22 is a cylindrical casing, the second casing 23 is a square casing, the diameter of an inscribed circle of the second casing 23 is equal to the outer diameter of the first casing 22, the positions of the side walls of the first casing 22 and the side walls of the second casing 23 are in laser penetration welding sealing connection, and four corner spaces of the second casing 23 form the accommodating cavity 24. The two opposite corner spaces of the second housing 23 form a first cavity 241 and accommodate a heat exchange medium, the two opposite outer corner spaces of the second housing 23 form a second cavity 242 and accommodate electrolyte, the position of the first housing 22 in the second cavity 242 is provided with a one-way valve 221, and the electrolyte in the second cavity 242 can flow into the first housing 22 unidirectionally through the one-way valve 221. The second casing 23 includes a top casing 236, a bottom casing 237, and a side casing 238 connected between the top casing 236 and the bottom casing 237, where the top casing 236, the side casing 238, and the bottom casing 237 are welded and sealed to the first casing 22 respectively, so as to enclose and form the cavity 24, the top casing 236 is provided with a liquid inlet 233, and the bottom casing 237 is provided with a liquid outlet 234 and a liquid injection 235. The battery also comprises a heat exchange pipeline 30, an integrated busbar 40 and a bracket 50, wherein the integrated busbar 40 is arranged at the top of the box body 10, the bracket 50 is arranged at the bottom of the box body 10, the battery unit 20 is arranged between the integrated busbar 40 and the bracket 50, part of the heat exchange pipeline 30 is embedded in the integrated busbar 40, the other part of the heat exchange pipeline 30 is arranged on the bracket 50, a top shell 236 of the second shell 23 is provided with a liquid inlet 233 communicated with a first cavity 241, a bottom shell 237 of the second shell 23 is provided with a liquid outlet 234 communicated with a second cavity 242, the heat exchange pipeline 30 is provided with a plurality of liquid inlets 32 and a plurality of liquid outlets 31, The liquid inlet 32 and the liquid outlet 31 are both connected with short connecting pipes 33, the liquid outlets 31 of the heat exchange pipeline 30 are communicated with the liquid inlet holes 233 of the battery monomers 20 in a one-to-one correspondence manner through the short connecting pipes 33, and the liquid inlets 32 of the heat exchange pipeline 30 are communicated with the liquid outlet holes 234 of the battery monomers 20 in a one-to-one correspondence manner through the short connecting pipes 33.

The application also provides an electric device, which comprises the battery cell provided by the embodiment and/or the battery provided by each embodiment.

According to the power utilization device of the embodiment, by adopting the battery cell 20 and/or the battery, the risk of thermal runaway of the battery cell and/or the battery in the power utilization device is reduced, and the use stability and reliability of the power utilization device are improved.

In the embodiment of the application, the electric device can be a vehicle, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. Spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others.

Because the electricity utilization device comprises the battery, the electricity utilization device at least has all the beneficial effects of the battery monomer and the battery, and the description is omitted herein.

The foregoing description of various embodiments is intended to highlight differences between the various embodiments, which may be the same or similar to each other by reference, and is not repeated herein for the sake of brevity.

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

Claims

1. A battery cell, comprising:

an electrode assembly;

a first case in which the electrode assembly is disposed;

The first shell is arranged in the second shell; wherein the method comprises the steps of

2. The battery cell of claim 1, wherein: the height of the second shell is equal to or smaller than that of the first shell, and the second shell is arranged on the side part of the first shell.

3. The battery cell of claim 1, wherein: the second shell is provided with a liquid inlet hole, and the liquid inlet hole is communicated with the part of the containing cavity containing the heat exchange medium and is used for injecting the heat exchange medium into the containing cavity.

4. A battery cell according to claim 3, wherein: the second shell is further provided with a liquid outlet hole, and the liquid outlet hole is communicated with the part of the containing cavity containing the heat exchange medium and used for discharging the heat exchange medium in the containing cavity.

5. The battery cell of claim 4, wherein: one of the liquid inlet hole and the liquid outlet hole is arranged at one end of the second shell along the height direction, and the other one of the liquid inlet hole and the liquid outlet hole is arranged at the other opposite end of the second shell along the height direction.

6. The battery cell of claim 5, wherein: the second shell comprises a top shell, a bottom shell and a side shell, wherein the top shell and the bottom shell are oppositely arranged along the height direction, the side shell is connected between the top shell and the bottom shell, the top shell, the side shell, the bottom shell and the side wall of the first shell enclose to form the containing cavity, one of the liquid inlet hole and the liquid outlet hole is formed in the top shell, and the other of the liquid inlet hole and the liquid outlet hole is formed in the bottom shell.

7. The battery cell of claim 1, wherein: the heat exchange medium is accommodated in the first cavity, electrolyte is accommodated in the second cavity, a one-way valve is arranged on the part of the first shell, which is positioned in the second cavity, and the one-way valve conducts the electrolyte from the second cavity to the inside of the first shell in a one-way mode.

8. The battery cell of claim 7, wherein: the second shell is also provided with a liquid injection hole, and the liquid injection hole is communicated with the second cavity and is used for injecting electrolyte into the second cavity.

9. The battery cell according to any one of claims 1 to 8, wherein: the second shell comprises a square shell, a regular triangle shell and a regular hexagon shell.

10. The battery cell of claim 9, wherein: the first shell is a round shell, the diameter of an inscribed circle of the second shell is equal to the outer diameter of the first shell, the side wall of the first shell is in sealing connection with the position where the side wall of the second shell contacts, and the corner space of the second shell forms the containing cavity.

11. The battery cell according to any one of claims 1 to 8, wherein: the side wall of the second shell is an insulating wall.

12. The battery cell according to any one of claims 1 to 8, wherein: the first shell is provided with a pressure relief valve, the pressure relief valve is positioned outside the second shell, and/or the second shell is provided with a pressure relief hole, and the pressure relief valve is opposite to the pressure relief hole.

13. A battery comprising a plurality of the battery cells of any one of claims 1-12.

14. The battery of claim 13, wherein: the battery is also provided with a heat exchange pipeline, and the space in which the heat exchange medium is accommodated in the accommodating cavity is communicated with the heat exchange pipeline.

15. The battery of claim 14, wherein: the heat exchange pipeline is provided with a plurality of liquid outlets and a plurality of liquid inlets, a plurality of liquid outlets are communicated with a plurality of containing cavities in one-to-one correspondence, and a plurality of liquid inlets are communicated with a plurality of containing cavities in one-to-one correspondence.

16. The battery of claim 14, wherein: the heat exchange pipeline is arranged at the top and/or the bottom of the battery monomer.

17. The battery of claim 14, wherein: the battery also comprises an integrated busbar, the battery monomer is electrically connected with the integrated busbar, and the heat exchange pipeline is embedded in the integrated busbar.

18. The battery of claim 17, wherein: the integrated busbar is provided with an outer surface which is opposite to the battery monomer, and the setting position of the heat exchange pipeline is not beyond the outer surface of the integrated busbar.

19. An electrical device, characterized in that: comprising a battery cell according to any of claims 1 to 12 and/or comprising a battery according to any of claims 13 to 18.