CN216354418U

CN216354418U - Battery and power consumption device

Info

Publication number: CN216354418U
Application number: CN202122429815.XU
Authority: CN
Inventors: 王育文; 吴益扬; 游兴艳; 叶永煌; 吴宁生
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-04-19
Anticipated expiration: 2031-10-09

Abstract

The embodiment of the application provides a battery and a power utilization device. The battery includes: a battery cell; and the temperature control device is arranged on the surface of the battery monomer and comprises an elastic body and a phase change material filled in the elastic body, and the elastic body is abutted against the battery monomer so that heat generated by the battery monomer is conducted to the phase change material through the elastic body and phase change reaction is carried out. The safety performance and the energy density of the battery can be improved.

Description

Battery and power consumption device

Technical Field

The present application relates to the field of battery technology, and more particularly, to a battery and a power consumption 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 considerable problem in the development of battery technology. If the safety problem of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to enhance the safety of the battery is a technical problem to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The application provides a battery and a power consumption device, which can enhance the safety of the battery.

In a first aspect, an embodiment of the present application provides a battery, including:

a battery cell; and

the temperature control device is arranged on the surface of the battery monomer and comprises an elastic body and a phase change material filled in the elastic body, and the elastic body is abutted against the battery monomer so that heat generated by the battery monomer is conducted to the phase change material through the elastic body and phase change reaction occurs.

Among the above-mentioned technical scheme, temperature control device includes the elastomer and fills in the phase change material of elastomer, temperature control device sets up in the free surface of battery, at the charge-discharge in-process, the heat that produces in the battery monomer conducts to the elastomer through the free surface of battery, and conduct to phase change material by the elastomer, phase change material absorbs the heat and is used for the phase change reaction, make the heat in the battery monomer obtain dissipating, prevent that the heat from gathering in the inside thermal runaway etc. that leads to of battery monomer, can in time adjust the temperature in the battery monomer, improve the security performance of battery. In the charging and discharging process, the battery monomer expands or contracts, particularly, the battery monomer can give a certain expansion acting force to the temperature control device when expanding, the elastic body is compressed to deform under the expansion acting force, the phase change material in the elastic body is driven to be compressed, and after the expansion acting force disappears, the elastic body can recover to deform to a certain degree; the elastic body and the phase-change material are coupled into a whole, the elastic action of the elastic body can give the buffer performance to the temperature control device and can buffer the expansion acting force generated by the single battery, so that the expansion force of the single battery in the circulation process can be reduced, the expansion force on a box body assembly of the battery is reduced, the structural stability of the whole battery is improved, and the safety performance of the battery is improved; meanwhile, the performance of the battery monomer is improved, and the battery monomer is protected. With phase change material and elastomer encapsulation as an organic whole, phase change material can not reveal, and temperature control device not only has buffer function and still has the temperature regulation function, and this temperature control device's shock-absorbing capacity can reduce or even cancel the use of blotter to promote the energy density of battery.

In some embodiments, the battery unit is provided in a plurality, and the plurality of battery units are sequentially arranged along the first direction; and a temperature control device is arranged between at least two adjacent battery monomers.

This application embodiment is equipped with temperature control device between adjacent battery monomer, and temperature control device can in time absorb the heat in the higher battery monomer of temperature, regulates and control this free temperature of battery, reduces the difference in temperature of the different positions of battery monomer, guarantees the free best performance of battery, reduces the highest temperature in the free working process of battery simultaneously, prevents that the free heat accumulation of battery from leading to the thermal runaway, guarantees the free normal work of battery, and then improves the security performance of battery.

In some embodiments, the battery cell includes two first faces opposing in a first direction and two second faces opposing in a direction perpendicular to the first direction; the temperature control device is arranged on at least one first surface and/or at least one second surface.

In this application embodiment, the heat that battery monomer produced conducts to temperature control device through first face and/or second face, and temperature control device's phase change material can absorb the heat in time regulate and control the temperature in the battery monomer.

In some embodiments, the temperature control device includes a receiving portion provided to the elastic body; the battery is including locating the portion of holding and the temperature sensing device that offsets with the battery monomer, and the temperature sensing device is used for gathering the free temperature of battery and outwards transmits the temperature.

In this application embodiment, the temperature sensing device sets up in the portion of holding, and the elastomer can give the temperature sensing device guard action, reduces the temperature sensing device by the possibility of battery monomer inflation extrusion, can guarantee the validity of temperature sensing device. And the temperature sensing device is arranged in the accommodating part, so that the battery space cannot be further occupied, and the energy density of the battery can be improved.

In some embodiments, the accommodating portion includes a first accommodating portion that penetrates the temperature control device in a thickness direction of the temperature control device; at least part of the temperature sensing device is arranged in the first accommodating part. In this application embodiment, first holding portion is the poroid structure, and the temperature sensing device is located in the first holding portion, and the temperature sensing device can direct and the free surface contact of battery, improves the accuracy of temperature acquisition.

In some embodiments, the receiving portion includes a second receiving portion concavely formed from an outer surface of the elastic body toward an inner surface of the elastic body; at least part of the temperature sensing device is arranged in the second accommodating part. In the embodiment of the application, the second accommodating part is of a groove type structure, and the groove type structure can improve the accuracy of installation of the temperature sensing device.

In some embodiments, the receiving portion includes a first receiving portion and a second receiving portion; the temperature sensing device includes: the acquisition part is arranged in the first accommodating part and is abutted against the single battery and used for acquiring the temperature of the single battery; locate the transmission portion of second portion of holding, be connected with the collection portion and be used for outside transmission temperature.

In this application embodiment, first holding portion is the poroid structure, and collection portion locates in the first holding portion, and collection portion can be with the free surperficial direct contact of battery, can improve the accuracy of temperature acquisition. The second containing part is of a groove type structure, the strength of the temperature control device opposite to the second containing part is relatively high, and the transmission part is long and arranged in the second containing part, so that the strength of the whole battery can be improved.

In some embodiments, the battery cell includes two first faces opposing in a first direction and two second faces opposing in a direction perpendicular to the first direction, the first faces being larger than the second faces in area; the acquisition part is arranged at the geometric center of the first surface.

In this application embodiment, the area of first face is bigger than the area in the second face, and the temperature at the geometric centre of first face is higher, sets up the collection portion in the geometric centre of first face, and the temperature of higher temperature department in the battery monomer can be gathered to the collection portion, and temperature acquisition is more accurate timely, is favorable to adjusting the temperature of external component for example thermal management system regulation battery, improves the security of battery.

In some embodiments, the projection of the temperature control device in the thickness direction of the temperature control device is located within the projection of the battery cell in the thickness direction of the temperature control device. In the embodiment of the application, the sectional area of the temperature control device in the direction perpendicular to the thickness direction of the temperature control device is smaller than the sectional area of the battery cell in the direction perpendicular to the thickness direction of the temperature control device. After the temperature control device is compressed by the acting force given by the battery cell, the sectional area of the compressed temperature control device in the thickness direction of the temperature control device is increased, but the energy density of the battery is basically not influenced, so that the energy density of the battery can be ensured.

In a second aspect, an embodiment of the present application provides an electric device, including the battery of the first aspect, where the battery is used to provide electric energy.

According to temperature control device of this application embodiment, at the charge-discharge in-process, the heat that produces in the battery monomer conducts to the elastomer through the free surface of battery to conduct to phase change material by the elastomer, phase change material absorbs the heat and is used for the phase transition reaction, makes the heat in the battery monomer obtain dissipating, prevents that the heat from gathering in the inside thermal runaway etc. that leads to of battery monomer, can in time adjust the temperature in the battery monomer, improves the security performance of battery. And the elastomer and the phase-change material are coupled into a whole, the elastic action of the elastomer can give the buffer performance of the temperature control device and can buffer the expansion acting force generated by the single battery, so that the single battery can be protected, and the safety performance of the battery is improved.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

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

fig. 2 is an exploded schematic view of a battery provided by some embodiments of the present application;

fig. 3 is a schematic structural view of the battery module shown in fig. 2;

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

fig. 5 is an exploded schematic view of a battery module according to further embodiments of the present application;

FIG. 6 is an enlarged schematic view of the battery module shown in FIG. 5 at I;

fig. 7 is a schematic structural view of a battery module according to further embodiments of the present application;

FIG. 8 is a schematic cross-sectional view of the battery module shown in FIG. 7 taken along line A-A;

FIG. 9 is an enlarged schematic view of the battery module shown in FIG. 8 at II;

in the drawings, the drawings are not necessarily drawn to scale.

Wherein, in the figures, the respective reference numerals:

x, a first direction; y, a second direction;

1. a vehicle; 2. a battery; 3. a controller; 4. a motor; 5. a case assembly; 51. a first tank portion; 52. a second tank portion; 53. an accommodating space; 6. a battery module; 7. a battery cell; 71. an electrode assembly; 72. a housing assembly; 721. a housing; 722. an end cap assembly 7a, a first face; 7b, a second face;

8. a temperature control device; 81. an elastomer; 81a, an outer surface; 81b, an inner surface; 82. a phase change material; 83. an accommodating portion; 831. a first accommodating portion; 832. a second accommodating portion;

9. a temperature sensing device; 91. a collecting part; 92. a transmission section.

Detailed Description

To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

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

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

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

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

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 lithium sodium ion battery cell, a magnesium ion battery cell, or the like, which is not limited in this application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the 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 cell includes an electrode assembly and an electrolyte, the electrode assembly including a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector; the positive current collector comprises a positive current collecting part and a positive electrode lug protruding out of the positive current collecting part, the positive current collecting part is coated with a positive active substance layer, and at least part of the positive electrode lug is not coated with the positive active substance layer. Taking a lithium ion battery monomer as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece comprises a negative pole current collector and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative current collecting part and a negative electrode lug protruding out of the negative current collecting part, the negative current collecting part is coated with a negative electrode active substance layer, and at least part of the negative electrode lug is not coated with the negative electrode active substance layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the spacer may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The battery cell may further include a housing assembly having a receiving cavity therein, the receiving cavity being a closed space provided by the housing assembly for the electrode assembly and the electrolyte. The shell assembly comprises a shell and an end cover assembly, wherein the shell is of a hollow structure with one side opened, and the end cover assembly covers the opening of the shell and is in sealing connection with the opening of the shell to form a containing cavity for containing the electrode assembly and the electrolyte.

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.

The inventor finds that the battery cell generates heat in the charging and discharging process, and if the heat cannot be timely dissipated to the external environment, excessive heat may be accumulated in the battery cell, so that thermal runaway of the battery cell may be caused, and safety risks may be caused.

In view of this, the present application provides a technical solution, in which a battery includes: a battery cell; and the temperature control device is arranged on the surface of the battery monomer and comprises an elastic body and a phase change material filled in the elastic body, and the elastic body is abutted against the battery monomer so that heat generated by the battery monomer is conducted to the phase change material through the elastic body and phase change reaction is carried out. The battery with the structure can conduct heat generated by the battery monomer outwards in time, and can play a role in adjusting the temperature of the battery, so that the safety of the battery is improved.

The technical scheme described in the embodiment of the application is suitable for the battery containing the battery cells and the electric device using the 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-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above power utilization device.

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

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application. As shown in fig. 1, a battery 2 is provided inside a vehicle 1, and the battery 2 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, and for example, the battery 2 may serve as an operation power source of the vehicle 1.

The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being adapted to control the battery 2 to power the motor 4, e.g. for start-up, navigation and operational power demands while driving of the vehicle 1.

In some embodiments of the present application, the battery 2 may be used not only as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1.

Fig. 2 is an exploded schematic view of a battery provided in some embodiments of the present application. As shown in fig. 2, the battery 2 includes a case assembly 5 and battery cells (not shown in fig. 2) accommodated in the case assembly 5.

The case assembly 5 is used for accommodating the battery cells, and the case assembly 5 may have various structures. In some embodiments, the case assembly 5 may include a first case portion 51 and a second case portion 52, the first case portion 51 and the second case portion 52 cover each other, and the first case portion 51 and the second case portion 52 together define a receiving space 53 for receiving the battery cell. The second casing part 52 may be a hollow structure with one open end, the first casing part 51 is a plate-shaped structure, and the first casing part 51 covers the open side of the second casing part 52 to form the casing assembly 5 with the accommodating space 53; the first casing portion 51 and the second casing portion 52 may be hollow structures with one side opened, and the open side of the first casing portion 51 covers the open side of the second casing portion 52 to form the casing assembly 5 having the accommodating space 53. Of course, the first and second casing portions 51 and 52 may be various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In order to improve the sealing property after the first casing portion 51 and the second casing portion 52 are connected, a sealing structure, such as a sealant or a gasket, may be provided between the first casing portion 51 and the second casing portion 52.

Assuming that the first box portion 51 covers the top of the second box portion 52, the first box portion 51 may also be referred to as an upper box cover, and the second box portion 52 may also be referred to as a lower box body.

In the battery 2, one or more battery cells may be provided. If the number of the battery monomers is multiple, the multiple battery monomers can be connected in series or in parallel or in series-parallel, and the series-parallel refers to that the multiple battery monomers are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers is accommodated in the box body component 5; of course, a plurality of battery cells may be connected in series, in parallel, or in series-parallel to form the battery module 6, and a plurality of battery modules 6 may be connected in series, in parallel, or in series-parallel to form a whole and accommodated in the case assembly 5.

Fig. 3 is a schematic structural view of the battery module shown in fig. 2. As shown in fig. 3, in some embodiments, there are a plurality of battery cells 7, and the plurality of battery cells 7 are connected in series or in parallel or in series-parallel to form the battery module 6. A plurality of battery modules 6 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case assembly.

The plurality of battery cells 7 in the battery module 6 may be electrically connected to each other by a bus member, so as to realize parallel connection, series connection, or parallel-series connection of the plurality of battery cells 7 in the battery module 6.

Fig. 4 is an exploded schematic view of a battery cell provided in some embodiments of the present application; fig. 5 is an exploded schematic view of a battery module according to further embodiments of the present application; FIG. 6 is an enlarged schematic view of the battery module shown in FIG. 5 at I; fig. 7 is a schematic structural view of a battery module according to further embodiments of the present application; FIG. 8 is a schematic cross-sectional view of the battery module shown in FIG. 7 taken along line A-A; fig. 9 is an enlarged schematic view of the battery module shown in fig. 8 at II.

As shown in fig. 4 to 9, in some embodiments, the battery includes a battery cell 7 and a temperature control device 8, the temperature control device 8 is disposed on a surface of the battery cell 7, the temperature control device 8 includes an elastic body 81 and a phase change material 82 filled in the elastic body 81, the elastic body 81 abuts against the battery cell 7, so that heat generated by the battery cell 7 is conducted to the phase change material 82 through the elastic body 81 and a phase change reaction occurs.

In the present embodiment, the battery cell 7 includes an electrode assembly 71 and a case assembly 72, and the electrode assembly 71 is housed in the case assembly 72.

In some embodiments, the housing assembly 72 may include a housing 721 and an end cap assembly 722, the housing 721 is a hollow structure with one side open, and the end cap assembly 722 covers the opening of the housing 721 and forms a sealing connection to form a containing cavity for containing the electrode assembly 71 and the electrolyte.

In other embodiments, the housing assembly 72 may also have other structures, for example, the housing assembly 72 includes a housing 721 and two end cap assemblies 722, the housing 721 is a hollow structure with two opposite sides opened, and one end cap assembly 722 is correspondingly covered on one opening of the housing 721 and is connected in a sealing manner to form a containing cavity for containing the electrode assembly 71 and the electrolyte.

In the battery cell 7, one or more electrode assemblies 71 may be accommodated in the case assembly 72. Illustratively, the number of electrode assemblies 71 in fig. 5 is four.

The electrode assembly 71 is a core component of the battery cell 7 for realizing the charging and discharging functions, and during the charging and discharging processes, the electrode assembly 71 generates heat, the temperature in the battery cell 7 rises, and the heat is dissipated out of the housing assembly and is conducted to the outside through the housing assembly 72. During the above-mentioned charging and discharging processes, the electrode assembly 71 may release gas, the gas may cause the pressure inside the battery cell 7 to increase, and apply a force to the housing assembly 72, and the housing assembly 72 may deform to some extent, which is reflected in the expansion of the battery cell 7.

The elastic body 81 of the embodiment of the present application is a structure having a certain elasticity, and when an external force is applied, the elastic body 81 can be deformed, and when the external force is removed, the elastic body 81 can be restored to the original shape to some extent. The elastic body 81 of the embodiment of the present application has a thermal conductive property, and can transfer heat in the battery cell to the phase change material 82. The elastic body 81 may be made of an organic polymer material, and the material of the elastic body 81 may be selected from heat conductive rubber, for example.

The Phase Change Material 82 (PCM) according to the embodiment of the present application refers to a substance that changes the state of a substance and can absorb or release latent heat without changing the temperature. Wherein the process of changing the state of the substance is a phase change process, and the temperature of the phase change material 82 before and after the phase change is almost maintained unchanged. The phase change material 82 of the embodiment of the present application may be selected from an organic phase change material, an inorganic phase change material, or a composite phase change material. Illustratively, the organic phase change material is selected from alkane phase change materials, fatty acid phase change materials, fatty alcohol phase change materials, fatty acid ester phase change materials, and the like. The inorganic phase-change material is selected from crystalline hydrated salt phase-change materials, molten salt phase-change materials and the like. The composite phase-change material is selected from a composition of paraffin and expanded graphite, or a composition of sodium nitrate with crystallization water, paraffin, white carbon black, polyacrylamide gel and trimethylolpropane, and the like.

Taking the composite phase-change material as an example to explain the phase-change process, heat is generated during the charging and discharging processes of the battery monomer 7, and the composite phase-change material absorbs the heat and is changed from a solid state to a liquid state. When the external environment temperature is lower, the composite phase change material can release heat, the liquid state is changed into the solid state, the heat is conducted into the battery monomer, and the temperature in the battery monomer 7 is kept stable.

Temperature control device 8 of the embodiment of the application includes elastomer 81 and fills in phase change material 82 of elastomer 81, temperature control device 8 sets up in battery monomer 7's surface, in charge-discharge process, the heat that produces in the battery monomer 7 conducts to elastomer 81 through battery monomer 7's surface, and conduct to phase change material 82 by elastomer 81, phase change material 82 absorbs the heat and is used for phase change reaction, make the heat in the battery monomer 7 dissipated, prevent that the heat from gathering in battery monomer 7 inside and leading to thermal runaway etc. can in time adjust the temperature in the battery monomer 7, improve the security performance of battery. In the charging and discharging process, the battery monomer 7 expands or contracts, particularly, the battery monomer 7 gives a certain expansion acting force to the temperature control device 8 when expanding, the elastic body 81 is compressed and deforms under the expansion acting force, and drives the phase-change material 82 in the elastic body 81 to be compressed, after the expansion acting force disappears, the elastic body 81 can recover the deformation to a certain extent, the elastic body 81 and the phase-change material 82 are coupled into a whole, the elastic action of the elastic body 81 can give the buffer performance to the temperature control device 8 and can buffer the expansion acting force generated by the battery monomer, so that the expansion force of the battery monomer 7 in the charging and discharging cycle process can be reduced, the expansion force of a box body assembly of the battery is reduced, the structural stability of the whole battery is improved, and the safety performance of the battery is improved; meanwhile, the performance of the battery monomer 7 is improved, and the battery monomer 7 is protected. Encapsulate phase change material 82 and elastomer 81 as an organic whole, phase change material 82 can not reveal, and temperature control device 8 not only has buffer function still has the temperature regulation function, and this temperature control device's cushioning property can reduce or even cancel the use of blotter to promote the energy density of battery.

In the present embodiment, the battery cell 7 may have a cylindrical shape, a flat body, a rectangular parallelepiped shape, or another shape. For the convenience of understanding the present application, a rectangular parallelepiped battery cell is exemplified hereinafter.

As shown in fig. 5, the battery cell 7 includes two first faces 7a oppositely disposed in a first direction X perpendicular to a second direction Y and two second faces 7b oppositely disposed in the second direction Y. The first face 7a and the second face 7b are both sides of the housing, the area of the first face 7a is larger than that of the second face 7b, and the two first faces 7a and the two second faces 7b enclose at least part of the surface of the housing. Of course, the surface of the housing may also include a bottom surface, the bottom surface and the side surface being connected and collectively enclosing the surface forming the housing.

Among the directions shown in fig. 5, X denotes a first direction, Y denotes a second direction, and the X direction and the Y direction are perpendicular.

In some embodiments, at least one second face 7b is provided with a temperature control device 8. The temperature control device 8 may be provided on one of the two second surfaces 7b, or may be provided on the two second surfaces 7 b. The heat generated by the battery cell 7 is conducted to the temperature control device 8 through the second surface 7b, and the phase change material 82 of the temperature control device 8 can absorb the heat to regulate and control the temperature in the battery cell 7 in time.

In other embodiments, at least one first face 7a is provided with a temperature control device 8. The temperature control device 8 may be provided on one of the two first surfaces 7a, or may be provided on the two first surfaces 7 a. The area of the first surface 7a is larger than that of the second surface 7b, the contact area between the first surface 7a and the elastic body 81 of the temperature control device 8 is larger, the heat conduction area of the elastic body 81 can be increased, heat in the battery unit 7 can be transmitted to the phase change material 82 through the elastic body 81 more quickly, and the phase change material 82 absorbs heat and can regulate and control the temperature in the battery unit 7 in time.

In still other embodiments, at least one first side 7a is provided with a temperature control device 8, and at least one second side 7b is provided with a temperature control device 8. More temperature control device 8's the position of setting up, temperature control device 8's elastomer 81 and battery monomer 7's contact surface are bigger, can further increase the heat-conducting area of elastomer 81 to accelerate heat conduction to phase change material 82, thereby improve the free temperature regulation and control speed of battery.

In the embodiment of the application, the battery can comprise one battery cell or a plurality of battery cells, and the number of the battery cells can be flexibly regulated according to actual production requirements.

In some embodiments, the battery includes a single battery cell, and the temperature control device 8 may be disposed at a side of the battery cell. The temperature of the side surface is higher, and the temperature control device 8 is arranged on the side surface, so that the heat generated by the battery monomer can be removed in time.

Referring to fig. 5, in other embodiments, the battery includes a plurality of battery cells 7, the battery cells 7 are sequentially arranged along the first direction X, and a temperature control device 8 is disposed between at least two adjacent battery cells 7. If one of the two adjacent battery cells has a high temperature, the battery cell having the high temperature may transfer heat to the adjacent battery cell, resulting in an excessively high temperature of the adjacent battery cell. According to the embodiment of the application, the temperature control device 8 is arranged between the two adjacent battery monomers 7, the temperature control device 8 can absorb heat in the battery monomer 7 with higher temperature in time, regulate and control the temperature of the battery monomer 7, reduce the temperature difference of different positions of the battery monomer 7, ensure the optimal performance of the battery monomer 7, reduce the highest temperature of the battery monomer 7 in the working process, prevent thermal runaway caused by heat accumulation of the battery monomer 7 and ensure the normal work of each battery monomer 7; and the heat of the battery cell 7 can be prevented from being conducted to the adjacent battery cells 7, thereby improving the temperature stability of each battery cell 7 and improving the safety performance of the battery.

Of course, the temperature control device 8 may be disposed not only between two adjacent battery cells 7, but also on a surface, such as the second surface 7b, where the two adjacent battery cells 7 do not contact, so as to further increase the speed at which the temperature control device 8 removes heat in the battery cells 7.

Taking the battery cells as rectangular parallelepiped as an example, the first surfaces 7a of the plurality of battery cells 7 are disposed to face each other, and the temperature control device 8 is disposed at least on the first surfaces 7a of the battery cells. Because the area of first face 7a is bigger relatively, and heat conduction area is bigger promptly, sets up temperature control device 8 in first face 7a, can regulate and control the temperature of battery monomer 7 more in time, improves the security performance of battery. Of course, the temperature control devices 8 may be disposed on the second surface 7b, the bottom surface, and the like of the battery cell, so as to further increase the heat conduction area and increase the speed of regulating the internal temperature of the battery cell 7.

With continued reference to fig. 5, in some embodiments, the projection of the temperature control device 8 in the thickness direction of the temperature control device 8 is located within the projection of the battery cell 7 in the thickness direction of the temperature control device 8. The sectional area of the temperature control device 8 in the direction perpendicular to the thickness of the temperature control device 8 is smaller than the sectional area of the battery cell 7 in the direction perpendicular to the thickness of the temperature control device 8. After the temperature control device 8 is compressed by the force applied by the battery cell 7, the cross-sectional area of the compressed temperature control device 8 in the thickness direction of the temperature control device 8 becomes large, but the energy density of the battery is hardly affected, and the energy density of the battery can be ensured. Illustratively, the height of the temperature control device 8 is smaller than the height of the battery cell 7, and the size of the temperature control device 8 in the second direction Y is smaller than the size of the battery cell 7 in the second direction Y. In fig. 5, the thickness direction of the temperature control device 8 is parallel to the X direction.

In order to monitor the temperature of the battery monomer in time, a temperature sensing device is usually arranged in the battery, but the battery monomer expands or contracts in the charging and discharging process of the battery monomer, and particularly, the temperature sensing device can be extruded during expansion, so that the temperature device fails, the temperature of the battery monomer cannot be monitored timely and effectively, and safety risks such as thermal runaway of the battery monomer are easy to occur.

As shown in fig. 5, in some embodiments, the temperature control device 8 includes a receiving portion 83 provided in the elastic body 81; the battery comprises a temperature sensing device 9 which is arranged in the accommodating part 83 and is abutted against the battery single body 7, and the temperature sensing device 9 is used for collecting the temperature of the battery single body 7 and transmitting the temperature outwards.

In the charge-discharge process of battery monomer 7, elastomer 81 effort can be given to battery monomer 7, deformation can take place for elastomer 81, after the effort disappears, elastomer 81 can resume deformation, elastomer 81 is located to portion 83, temperature-sensing device 9 sets up in portion 83, elastomer 81 can give temperature-sensing device 9 guard action, reduce the possibility that temperature-sensing device 9 is extruded by battery monomer 7 inflation, can guarantee temperature-sensing device 9's validity, temperature-sensing device 9 can in time gather the temperature in the battery monomer 7 and outwards transmit it, be convenient for follow-up carry out the battery regulation and control according to the temperature in the battery monomer 7. And the temperature sensing device 9 is arranged in the accommodating part 83, so that the battery space is not further occupied, and the energy density of the battery is favorably improved.

With continued reference to fig. 5, in some embodiments, the temperature sensing device 9 includes a collecting portion 91 and a transmitting portion 92. The collecting portion 91 abuts against the battery cell 7 and collects the temperature of the battery cell 7. The transmitting portion 92 is electrically connected to the collecting portion 91 and serves to transmit the temperature to the outside. In the embodiment of the present application, the acquisition portion 91 acquires the temperature of the battery cell 7 and can convert it into a digital signal that can be used for output, and the transmission portion 92 transmits the digital signal to the outside. For example, the collecting part 91 may be a contact temperature sensor or a non-contact temperature sensor, and the transmitting part 92 may be a wire electrically connected to an external member such as a thermal management system.

In some embodiments, the acquisition portion 91 is disposed at the geometric center of the first face 7 a. The area of first face 7a is bigger than the area of second face 7b, compare in the battery cell 7 other faces for example the bottom surface of casing, the surface of second face 7b or end cover subassembly, the temperature of the geometric center of first face 7a is higher, set up collection portion 91 in the geometric center of first face 7a, collection portion 91 can gather the temperature of higher temperature department in the battery cell 7, temperature acquisition is more accurate timely, and be favorable to adjusting the temperature that external member for example heat management system adjusted the battery, improve the security of battery.

As shown in fig. 5 and 6, in some examples, the accommodating portion 83 includes a first accommodating portion 831, the first accommodating portion 831 penetrating the temperature control device 8 in a thickness direction of the temperature control device 8; at least a portion of the temperature sensing device 9 is disposed in the first accommodation portion 831. The first accommodating part 831 is in a hole-shaped structure, and the temperature sensing device 9 can be directly contacted with the surface of the battery unit 7, so that the accuracy of temperature collection is improved. In fig. 6, the thickness direction of the temperature control device 8 is parallel to the X direction.

As shown in fig. 6 to 9, in other examples, the accommodating portion 83 includes a second accommodating portion 832, and the second accommodating portion 832 is concavely formed from the outer surface 81a of the elastic body 81 toward the inner surface 81b of the elastic body 81; at least a part of the temperature sensing device 9 is disposed in the second accommodation portion 832. The second receiving portion 832 is a groove structure, which can improve the accuracy of mounting the temperature sensing device 9. The outer surface 81a of the elastic body 81 refers to the surface of the elastic body 81 facing away from the phase change material 82, and the inner surface 81b of the elastic body 81 refers to the surface of the elastic body 81 facing toward the phase change material 82.

In the embodiment of the present application, the second receiving portion 832 may be disposed on a side of the elastic body 81 facing the battery cell, and at least a portion of the temperature sensing device 9 may be abutted against a surface of the battery cell 7 and directly contact the surface of the battery cell 7, so that accuracy of the temperature collected by the temperature sensing device 9 may be improved. Of course, the second receiving portion 832 may be located on a side of the elastic body 81 facing away from the battery cell 7, so as to facilitate installation and replacement of the temperature sensing device 9.

In still other examples, receptacle 83 includes a first receptacle 831 and a second receptacle 832. The collecting portion 91 is disposed in the first receiving portion 831, and the transmitting portion 92 is disposed in the second receiving portion 832. The first accommodating part 831 is in a hole type structure, the collecting part 91 is arranged in the first accommodating part 831, and the collecting part 91 can be in direct contact with the surface of the battery cell 7, so that the accuracy of temperature collection can be improved; and locate collection portion 91 in first holding portion 831, can protect collection portion 91 effectively to can additionally not occupy the space of battery, promote the energy density of battery. The second accommodating part 832 is of a groove-type structure, the strength of the temperature control device 8 opposite to the second accommodating part 832 is relatively high, and the transmission part 92 is arranged in the second accommodating part 832 due to the long length, so that the strength of the whole battery can be improved; in addition, the transmission part 92 is disposed in the second accommodation part 832, so that the transmission part 92 can be effectively protected, and the space of the battery is not additionally occupied, thereby further improving the energy density of the battery.

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, comprising:

a battery cell (7); and

temperature control device (8), set up in the surface of battery monomer (7), temperature control device (8) include elastomer (81) and fill in phase change material (82) in elastomer (81), elastomer (81) and battery monomer (7) butt, so that the heat process that battery monomer (7) produced the elastomer (81) conduct extremely phase change material (82) and take place the phase change reaction.

2. The battery according to claim 1, wherein the battery cell (7) is provided in plurality, and a plurality of the battery cells (7) are arranged in sequence along the first direction (X); the temperature control device (8) is arranged between at least two adjacent battery single bodies (7).

3. The battery according to claim 1 or 2, characterized in that the battery cell (7) comprises two first faces (7a) opposite along a first direction (X) and two second faces (7b) opposite along a direction perpendicular to the first direction (X); the temperature control device (8) is arranged on at least one first surface (7a) and/or at least one second surface (7 b).

4. The battery of claim 1,

the temperature control device (8) comprises an accommodating part (83) arranged on the elastic body (81);

the battery further comprises a temperature sensing device (9) which is arranged in the accommodating part (83) and is abutted against the battery monomer (7), and the temperature sensing device (9) is used for collecting the temperature of the battery monomer (7) and transmitting the temperature outwards.

5. The battery of claim 4,

the accommodating part (83) comprises a first accommodating part (831), and the first accommodating part (831) penetrates through the temperature control device (8) along the thickness direction of the temperature control device (8);

at least part of the temperature sensing device (9) is arranged in the first accommodating part (831).

6. The battery of claim 4 or 5,

the accommodating part (83) comprises a second accommodating part (832), and the second accommodating part (832) is concavely formed from the outer surface (81a) of the elastic body (81) to the direction of the inner surface (81b) of the elastic body (81); at least a part of the temperature sensing device (9) is disposed in the second accommodation portion (832).

7. The battery according to claim 6, characterized in that the temperature-sensitive means (9) comprise:

the accommodating portion (83) includes a first accommodating portion (831) and the second accommodating portion (832);

the acquisition part (91) is arranged in the first accommodating part (831), abuts against the single battery (7) and is used for acquiring the temperature of the single battery (7);

and a transmission part (92) which is arranged in the second accommodating part (832), is connected with the collection part (91) and is used for transmitting temperature outwards.

8. The battery of claim 7,

the battery cell (7) comprises two first faces (7a) opposite in a first direction (X) and two second faces (7b) opposite in a direction perpendicular to the first direction (X), the first faces (7a) having an area greater than the area of the second faces (7 b);

the acquisition part (91) is arranged at the geometric center of the first surface (7 a).

9. The battery according to claim 1, characterized in that the projection of the temperature control device (8) in the thickness direction of the temperature control device (8) is located within the projection of the battery cell (7) in the thickness direction of the temperature control device (8).

10. An electric consumer, characterized in that it comprises a battery (2) according to any of claims 1 to 9, said battery (2) being intended to provide electric energy.