CN219979666U - Battery and electricity utilization device - Google Patents

Abstract

The application provides a battery and an electricity utilization device, and belongs to the technical field of batteries. The battery comprises a box body, a battery monomer and a thermal management component, wherein the box body is provided with a containing cavity, the battery monomer and the thermal management component are both positioned in the containing cavity, and the thermal management component comprises a first part contacted with the box body and a second part contacted with the battery monomer. Wherein the average thermal conductivity of the first portion is less than the average thermal conductivity of the second portion. The heat management component comprises a first heat exchange plate and a second heat exchange plate, the first heat exchange plate is positioned between the inner side wall of the box body and the sub-accommodating cavity, and the second heat exchange plate is positioned between the adjacent sub-accommodating cavities. The average heat conductivity coefficient of the first heat exchange plate is smaller than that of the second heat exchange plate, the first part comprises a part of the first heat exchange plate, which is contacted with the box body, and the second part comprises a part of the second heat exchange plate, which is contacted with the battery cell. The thermal management effect of the thermal management component on the battery monomer is improved, and the reliability of the battery is improved.

Description

Battery and electricity utilization device

Technical Field

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

Background

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles.

The battery includes the box and is located the battery monomer of box, and the battery monomer needs to use under suitable temperature, is provided with thermal management part in the box, and thermal management part can be used to adjust the temperature of battery monomer.

In the related art, the thermal management effect of the thermal management member is poor, affecting the reliability of the battery.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the background art. It is, therefore, an object of the present utility model to provide a battery and an electric device to improve the thermal management effect of a thermal management member.

An embodiment of a first aspect of the present utility model provides a battery. The battery includes: the box body is provided with an accommodating cavity; the battery monomer is positioned in the accommodating cavity; the thermal management component is positioned in the accommodating cavity and comprises a first part contacted with the box body and a second part contacted with the battery cell; wherein the average thermal conductivity of the first portion is less than the average thermal conductivity of the second portion; the holding cavity includes a plurality of sub-holding cavities of arranging along first direction X interval, and battery cell is located sub-holding cavity, and thermal management part includes: the first heat exchange plate is positioned between the inner side wall of the box body and the sub accommodating cavity along the first direction X; the second heat exchange plate is positioned between the adjacent sub-accommodating cavities along the first direction X; the average heat conductivity coefficient of the first heat exchange plate is smaller than that of the second heat exchange plate, the first part comprises a part of the first heat exchange plate, which is contacted with the box body, and the second part comprises a part of the second heat exchange plate, which is contacted with the battery cell.

In the technical scheme of the embodiment of the application, the second part is in contact with the battery monomer, and the average heat conductivity coefficient of the second part is larger, so that the second part can effectively exchange heat with the battery to perform heat management on the battery monomer. The first part contacts with the box body, and the average heat conductivity coefficient of the first part is smaller, so that heat exchange between the first part and the box body can be reduced, heat loss is reduced, heat of the heat management component is more used for heat management of the battery cells, the heat management effect of the heat management component on the battery cells is improved, and the reliability of the battery is improved. The heat management component is arranged in the form of the first heat exchange plate and the second heat exchange plate, so that the heat management component is convenient to arrange, and the average heat conductivity of the first heat exchange plate and the average heat conductivity of the second heat exchange plate can be determined according to the positions of the first heat exchange plate and the second heat exchange plate so as to meet the requirement that the average heat conductivity of the first part in the heat management component is smaller than that of the second part.

In some embodiments, the first heat exchange plate comprises: the first plate body is positioned between the inner side wall of the box body and the sub-accommodating cavity along the first direction X, and is provided with a first heat exchange flow channel and a first heat exchange medium positioned in the first heat exchange flow channel; the spacer component is positioned between the first plate body and the inner side wall of the box body along the first direction X; wherein, the one side that spacer assembly was kept away from to first plate body contacts with the battery monomer, and spacer assembly kept away from the one side of first plate body contacts with the box, and spacer assembly's average coefficient of heat conductivity is less than the average coefficient of heat conductivity of first plate body, and first part includes first plate body, and the second part includes spacer assembly. The first plate body contacts with the battery monomer, carries out heat exchange between the first plate body and the battery monomer, and simultaneously the interval component separates the first plate body and the box, and the average heat conductivity coefficient of the interval component is smaller than that of the first plate body, reduces the influence of the box on the first plate body, and makes the first plate body carry out heat exchange with the battery monomer more, thereby improving the thermal management effect of the thermal management component on the battery monomer and improving the reliability of the battery.

In some embodiments, the average thermal conductivity of the second heat exchange plate is greater than or equal to the average thermal conductivity of the first plate body. The second heat exchange plate and the first plate body are used for carrying out heat exchange with the battery monomers, and when the average heat conductivity coefficient of the second heat exchange plate is equal to that of the first plate body, the difference of the heat management effect of the heat management component on each battery monomer is smaller, so that the stability of the battery is facilitated. Meanwhile, the first plate body is close to the box body, the average heat conductivity coefficient of the second heat exchange plate is larger than that of the first plate body, so that the first plate body can be influenced by the box body less, the heat management effect of the heat management component on the battery monomer can be improved, and the stability of the battery is facilitated.

In some embodiments, the spacer assembly includes a plurality of spacer plates coupled to the first plate body, the first heat exchange medium having a thermal conductivity greater than a thermal conductivity of the gas within the receiving cavity. The first plate body is separated from the box body through the plurality of partition boards, the influence of the box body on the first plate body is reduced, meanwhile, the space between the first plate body and the box body is provided with gas in the accommodating cavity, the heat conductivity coefficient of the gas is very small, and the influence of the box body on the first plate body can be further reduced.

In some embodiments, the angle α between the plate face of the spacer plate and the plate face of the first plate body is less than 90 degrees. The partition plate contacts with the box body, and when the box body is impacted to extrude the partition plate, the partition plate can incline to one inclined side, so that the possibility of bending the partition plate is reduced.

In some embodiments, the spacer assembly comprises: the second plate body is provided with a second heat exchange flow channel and a second heat exchange medium positioned in the second heat exchange flow channel; wherein the coefficient of thermal conductivity of the first heat exchange medium is greater than the coefficient of thermal conductivity of the second heat exchange medium. The second plate body can also separate first plate body and box, reduces the influence of box to first plate body, and the coefficient of heat transfer of second heat transfer medium is less than the coefficient of heat transfer of first heat transfer medium simultaneously for heat exchange between second plate body and the box reduces, can further reduce the influence of box to first plate body.

In some embodiments, the first plate and the second plate share a common plate surface. The space occupied by the first heat exchange plate can be reduced, and the energy density of the battery is improved.

In some embodiments, the thermal management component comprises a plurality of second heat exchange plates, the average thermal conductivity of the second heat exchange plates gradually decreasing in a direction from a middle portion of the plurality of second heat exchange plates to an edge portion of the plurality of second heat exchange plates, the direction being parallel to the first direction X. The temperature of the middle battery monomer is difficult to adjust, and the average heat conductivity coefficient of the second heat exchange plate is larger when the temperature is closer to the middle battery monomer, so that the temperature of the middle battery monomer is adjusted more quickly, the heat management effect of the whole battery is more average, and the reliability of the battery is improved.

In some embodiments, the first portion comprises a first heat exchanger plate and the second portion comprises a second heat exchanger plate, the material of the first heat exchanger plate having a thermal conductivity that is less than the thermal conductivity of the material of the second heat exchanger plate. The first heat exchange plate and the second heat exchange plate are identical in structure, but different in material, so that heat exchange can be performed on the battery monomer of the second heat exchange plate, the first heat exchange plate and the box body are subjected to heat exchange, and the heat conductivity coefficient of the material of the first heat exchange plate is smaller than that of the material of the second heat exchange plate, so that the heat exchange between the first heat exchange plate and the box body is less, the heat management effect of the heat management component on the battery monomer can be improved, and the structure of the first heat exchange plate is simpler.

In some embodiments, the average thermal conductivity of the first portion is greater than or equal to 0.05W/(m·k) and less than or equal to 40W/(m·k). The average heat conductivity coefficient of the first part is limited in the range, so that the heat management effect of the heat management component on the battery cell is improved, and meanwhile, the manufacturing difficulty is reduced.

In some embodiments, the average thermal conductivity of the first portion is greater than or equal to 0.1W/(m·k) and less than or equal to 20W/(m·k). The average heat conductivity coefficient of the first part is further limited, the heat management effect of the heat management component on the battery cell is further improved, and meanwhile manufacturing difficulty is reduced.

In some embodiments, the second portion has an average thermal conductivity greater than or equal to 25W/(m·k) and less than or equal to 200W/(m·k). The average heat conductivity of the second portion is limited to the above range, improving the thermal management effect of the thermal management member on the battery cell while reducing the weight of the battery.

In some embodiments, the second portion has an average thermal conductivity greater than or equal to 50W/(m·k) and less than or equal to 140W/(m·k). The average thermal conductivity of the second portion is further defined to further enhance the thermal management effect of the thermal management component on the battery cells while reducing the weight of the battery.

An embodiment of the second aspect of the present application provides an electric device, which includes the battery in the above embodiment, and the battery is used for providing electric energy.

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 the drawings, the same reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily drawn to scale. It is appreciated that these drawings depict only some embodiments according to the disclosure and are not therefore to be considered limiting of its scope.

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

fig. 2 is a schematic structural diagram of a battery according to some embodiments of the present application;

FIG. 3 is a block diagram of a battery cell and thermal management components provided in accordance with some embodiments of the present application;

fig. 4 is a schematic structural diagram of a battery according to some embodiments of the present application;

fig. 5 is a schematic structural diagram of a first heat exchange plate according to some embodiments of the present application;

FIG. 6 is a right side view of the first heat exchanger plate of FIG. 5 according to some embodiments of the present application;

fig. 7 is a schematic structural diagram of another first heat exchange plate according to some embodiments of the present application;

FIG. 8 is a right side view of the first heat exchange plate of FIG. 7 according to some embodiments of the present application;

fig. 9 is a schematic structural diagram of another first heat exchange plate according to some embodiments of the present application.

Reference numerals illustrate:

1000. a vehicle; 100. a battery; 200. a controller; 300. a motor;

10. a case; 11. a receiving cavity; 12. a partition plate; 111. a sub-receiving cavity; 20. a battery cell; 30. a thermal management component; 301. a first portion; 302. a second portion; 31. a first heat exchange plate; 311. a first plate body; 312. a first heat exchange flow passage; 313. a spacer assembly; 314. a partition plate; 315. a second plate body; 316. a second heat exchange flow passage; 317. a partition plate; 318. a first current collector; 319. a second current collector; 32. and a second heat exchange plate.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the 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 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. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

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 one embodiment 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 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).

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

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

The battery comprises a box body and a battery monomer, wherein the box body is provided with a containing cavity, and the battery monomer is positioned in the containing cavity. Because the battery monomer needs to work under suitable temperature, so can set up thermal management part in the box, thermal management part can be used to adjust the free temperature of battery, and the free temperature of battery drops down when the free temperature of battery is too high, and the free temperature of battery rises up when the free temperature of battery is too low. The heat management component is in contact with the battery cell to realize heat exchange, but the heat management component is also in contact with the box body, so that part of heat in the heat management component is exchanged with the box body, and the battery cell is not subjected to heat management, so that the heat management component has poor heat management effect on the battery cell and influences the reliability of the battery.

The embodiment of the application provides a battery, which comprises a box body, a battery cell and a thermal management component, wherein the box body is provided with an accommodating cavity, the battery cell and the thermal management component are both positioned in the accommodating cavity, the thermal management component comprises a first part contacted with the box body and a second part contacted with the battery cell, and the average heat conductivity of the first part is smaller than that of the second part. The heat management component comprises a first heat exchange plate and a second heat exchange plate, the first heat exchange plate is positioned between the inner side wall of the box body and the sub-accommodating cavity, and the second heat exchange plate is positioned between the adjacent sub-accommodating cavities. The average heat conductivity coefficient of the first heat exchange plate is smaller than that of the second heat exchange plate, the first part comprises a part of the first heat exchange plate, which is contacted with the box body, and the second part comprises a part of the second heat exchange plate, which is contacted with the battery cell. Because the average heat conductivity coefficient of the first part is smaller, heat exchange between the thermal management component and the box body can be reduced, so that the influence of the box body and the environment temperature outside the box body on the thermal management component is reduced, the thermal management effect of the thermal management component on the battery monomer is improved, and the reliability of the battery is improved.

The battery disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. A power supply system having the disclosed battery may be used, which is advantageous in improving the thermal management effect of the thermal management component, improving the stability of battery performance and battery life.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take an electric device according to an embodiment 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 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

An embodiment of the present application provides a battery, and fig. 2 is a schematic structural diagram of the battery according to some embodiments of the present application. Referring to fig. 2, the battery includes a case 10, a battery cell 20, and a thermal management member 30, the case 10 having a receiving cavity 11, the battery cell 20 and the thermal management member 30 being both located within the receiving cavity 11, the thermal management member 30 including a first portion 301 in contact with the case 10, and a second portion 302 in contact with the battery cell 20. Wherein the average thermal conductivity of the first portion 301 is less than the average thermal conductivity of the second portion 302.

According to some embodiments of the present application, referring to fig. 2, the receiving chamber 11 includes a plurality of sub-receiving chambers 111 spaced apart along the first direction X, and the battery cells 20 are positioned within the sub-receiving chambers 111.

Fig. 3 is a block diagram of a battery cell and thermal management components according to some embodiments of the application. Referring to fig. 2 and 3, the thermal management component 30 includes a first heat exchange plate 31 and a second heat exchange plate 32. Along the first direction X, the first heat exchange plate 31 is located between the inner sidewall of the case 10 and the sub-accommodating chamber 111, and the second heat exchange plate 32 is located between adjacent sub-accommodating chambers 111. Wherein the average thermal conductivity of the first heat exchange plate 31 is smaller than that of the second heat exchange plate 32, the first portion 301 includes a portion where the first heat exchange plate 31 contacts the case 10, and the second portion 302 includes a portion where the second heat exchange plate 32 contacts the battery cell 20.

The case 10 is used for providing an accommodating space for the battery cell 20, the battery cell 20 is accommodated in the case 10, and the case 10 can adopt various structures. In some embodiments, the case 10 may include a first receiving part and a second receiving part, which are mutually covered, and which together define the receiving cavity 11 for receiving the battery cell 20. The second accommodating part can be of a hollow structure with one end open, the first accommodating part can be of a plate-shaped structure, and the first accommodating part covers the open side of the second accommodating part so that the first accommodating part and the second accommodating part jointly define an accommodating space; the first accommodating portion and the second accommodating portion may be hollow structures each having an opening at one side, and the opening side of the first accommodating portion is engaged with the opening side of the second accommodating portion. Of course, the case 10 formed by the first and second receiving parts may be of various shapes, such as a cylinder, a rectangular parallelepiped, etc.

In fig. 2, in order to clearly show the battery cell 20 and the thermal management member 30 in the case 10, the case in fig. 2 shows only one of the first and second receiving parts.

The case 10 is used to form a component of the internal environment of the battery 100, and optionally, the case 10 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the case 10 is not easily deformed when being impacted by extrusion, so that the battery 100 can have a higher structural strength and the safety performance can be improved.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 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 cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

The thermal management component 30 is configured to thermally manage the battery cell 20, cool the battery cell 20 when the temperature of the battery cell 20 is too high, and heat the battery cell 20 when the temperature of the battery cell 20 is too low, so that the battery cell 20 operates at a suitable temperature. The thermal management component 30 is in direct contact with the battery cell 20, so that heat exchange can be directly performed between the thermal management component 30 and the battery cell 20, heat loss is reduced, and the thermal management efficiency of the thermal management component 30 on the battery cell 20 is higher. The thermal management member 30 contacts the case 10, and thus, the utilization rate of the accommodating chamber 11 can be improved, thereby improving the energy density of the battery.

The thermal conductivity is a performance of the material with respect to homogeneous materials, and when the material has porous, multi-layer, multi-structure, anisotropic and other properties, the thermal conductivity obtained by the material is actually a performance of comprehensive thermal conductivity, which is called average thermal conductivity.

In embodiments of the present application, when the first portion 301 has a heat transfer medium therein, the average thermal conductivity of the first portion 301 is that of the heat transfer medium in the first portion 301 to be considered. Likewise, when the second portion 302 has a heat transfer medium therein, the average thermal conductivity of the second portion 302 is that of the heat transfer medium within the second portion 302 to be considered.

In the embodiment of the application, the average heat conductivity coefficient can be obtained by detection according to the national standard GB/T10297.

In the embodiment of the present application, the second portion 302 contacts the battery cell 20, and the average thermal conductivity of the second portion 302 is larger, so that the second portion 302 can perform effective heat exchange with the battery cell 20, and perform heat management on the battery cell 20. The first portion 301 contacts with the case 10, and the average thermal conductivity of the first portion 301 is smaller, so that heat exchange between the first portion 301 and the case 10 can be reduced, heat loss is reduced, heat of the thermal management component 30 is used for thermal management of the battery cells 20 more, the thermal management effect of the thermal management component 30 on the battery cells 20 is improved, and reliability of the battery is improved.

In an embodiment of the application, the thermal management member 30 is provided in the form of a first heat exchanger plate 31 and a second heat exchanger plate 32, on the one hand, the arrangement of the thermal management member 30 is facilitated, and on the other hand, the average thermal conductivity of the first heat exchanger plate 31 and the average thermal conductivity of the second heat exchanger plate 32 can be determined based on the positions of the first heat exchanger plate 31 and the second heat exchanger plate 32 so as to satisfy the requirement that the average thermal conductivity of the first portion 301 in the thermal management member 30 is smaller than the average thermal conductivity of the second portion 302.

The boundary of the sub-receiving chamber 111 is indicated by a dashed box in fig. 2. In an embodiment of the present application, one sub-receiving cavity 111 may have one or more battery cells 20 therein, and the plurality of battery cells 20 in the same sub-receiving cavity 111 may be arranged along a second direction Y, where the first direction X is perpendicular to the second direction Y, and the second direction Y is parallel to both the first heat exchange plate 31 and the second heat exchange plate 32.

Referring to fig. 2, the case 10 further includes a partition plate 12, the partition plate 12 being positioned in the accommodating chamber 11, one side of the partition plate 12 being used for placing the battery cells 20, and the other side of the partition plate 12 being used for placing other components of the battery. Referring to fig. 2 and 3, both heat exchange plates at the extreme side in the first direction X are first heat exchange plates 31, and one of the first heat exchange plates 31 is in contact with the partition plate 12.

In the embodiment of the application, the second heat exchange plates 32 are located between the first heat exchange plates 31, that is, in the battery, the heat exchange effect of the middle portion is better than that of the edge portion.

Fig. 4 is a schematic structural diagram of a battery according to some embodiments of the present application. Wherein fig. 2 and 4 differ in the arrangement direction of the first heat exchange plate 31 and the second heat exchange plate 32, in fig. 2, the first heat exchange plate 31 and the second heat exchange plate 32 are both in contact with the large surface of the battery cell 20, and in fig. 4, the first heat exchange plate 31 and the second heat exchange plate 32 are both in contact with the side surface of the battery cell 20. The battery cell 20 includes two large faces, both large faces are perpendicular to the thickness direction of the battery cell 20, and the side face of the battery cell 20 is used for connecting the two large faces. Note that, the first direction X is with reference to the arrangement direction of the sub-receiving cavities 111, and in fig. 2, the first direction X is the same as the thickness direction of the battery cells 20, and in fig. 4, the first direction X is perpendicular to the thickness direction of the battery cells 20.

Fig. 5 is a schematic structural diagram of a first heat exchange plate according to some embodiments of the present application. Fig. 6 is a right side view of the first heat exchanger plate of fig. 5 provided in some embodiments of the present application. Referring to fig. 5 and 6, the first heat exchange plate 31 includes a first plate body 311 and a spacing assembly 313. Referring to fig. 2, 5 and 6, along a first direction X, the first plate 311 is located between the inner sidewall of the case 10 and the sub-receiving chamber 111, the first plate 311 has a first heat exchange flow channel 312, and a first heat exchange medium located in the first heat exchange flow channel 312, and along the first direction X, the spacer assembly 313 is located between the first plate 311 and the inner sidewall of the case 10. The side of the first plate 311 away from the spacer assembly 313 contacts the battery cell 20, the side of the spacer assembly 313 away from the first plate 311 contacts the case 10, the average thermal conductivity of the spacer assembly 313 is smaller than the average thermal conductivity of the first plate 311, the first portion 301 includes the first plate 311, and the second portion 302 includes the spacer assembly 313.

In the embodiment of the present application, the first plate 311 is in contact with the battery cell 20, heat exchange is performed between the first plate 311 and the battery cell 20, the spacer 313 is in contact with the case 10, and heat exchange is performed between the spacer 313 and the case 10. Wherein the body of the first plate 311 in the first plate 311 and the first heat exchange medium in the first heat exchange flow channel 312 exchange heat with the battery cell 20.

In some embodiments of the present application, the first plate 311 has a plurality of first heat exchange channels 312 arranged along the third direction Z, and the first heat exchange channels 312 extend along the second direction Y, where the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

In an embodiment of the application, the first heat exchange medium may be a glycol solution.

In the embodiment of the application, the first plate 311 is in contact with the battery cell 20, the first plate 311 exchanges heat with the battery cell 20, meanwhile, the first plate 311 and the box 10 are separated by the spacing component 313, the average heat conductivity of the spacing component 313 is smaller than that of the first plate 311, the influence of the box 10 on the first plate 311 is reduced, and the first plate 311 exchanges heat with the battery cell 20 more, so that the thermal management effect of the thermal management component 30 on the battery cell 20 is improved, and the reliability of the battery is improved.

In some embodiments of the present application, the material of the body of the first plate 311 may be the same as or different from the material of the body of the spacer assembly 313, but the thermal conductivity of the material of the body of the first plate 311 is less than the thermal conductivity of the material of the body of the spacer assembly 313.

Illustratively, the material of the body of the first plate 311 and the material of the body of the spacer assembly 313 are both metal, e.g., aluminum. Or the material of the body of the first plate 311 is metal and the material of the body of the spacer 313 is plastic.

According to some embodiments of the application, the average thermal conductivity of the second heat exchange plate 32 is greater than or equal to the average thermal conductivity of the first plate body 311.

In some embodiments of the present application, the structure of the second heat exchange plate 32 is the same as that of the first plate body 311, and the second heat exchange plate 32 has a third heat exchange flow channel and a third heat exchange medium located in the third heat exchange flow channel, and the third heat exchange medium may also be an ethylene glycol solution.

In the embodiment of the present application, the second heat exchange plate 32 and the first plate 311 are used for exchanging heat with the battery cells 20, and when the average thermal conductivity of the second heat exchange plate 32 is equal to that of the first plate 311, the thermal management effect of the thermal management component 30 on each battery cell 20 is smaller, which is beneficial to the stability of the battery. Meanwhile, the first plate 311 is closely spaced from the case 10, and the average thermal conductivity of the second heat exchange plate 32 is greater than that of the first plate 311, so that the first plate 311 can be less affected by the case 10, and the thermal management effect of the thermal management component 30 on the battery cell 20 can be improved, which is beneficial to the stability of the battery.

Fig. 7 is a schematic structural diagram of another first heat exchange plate according to some embodiments of the present application. Fig. 8 is a right side view of the first heat exchanger plate of fig. 7 provided in some embodiments of the present application. Referring to fig. 7 and 8, the spacing assembly 313 includes a plurality of spacing plates 314 connected to the first plate body 311, and the first heat exchange medium has a thermal conductivity greater than that of the gas in the accommodating chamber 11.

In the embodiment of the present application, the plurality of partition plates 314 are arranged in parallel along the third direction Z at intervals, and the length direction of the partition plates 314 is parallel to the second direction Y.

In the embodiment of the application, the first plate 311 is separated from the box 10 by the plurality of partition plates 314, so that the influence of the box 10 on the first plate 311 is reduced, meanwhile, the gas in the accommodating cavity 11 is arranged between the first plate 311 and the box 10, and the heat conductivity coefficient of the gas is small, so that the influence of the box 10 on the first plate 311 can be further reduced.

Illustratively, the gas may include air.

According to some embodiments of the present application, the angle α between the plate surface of the partition plate 314 and the plate surface of the first plate body 311 is less than 90 degrees.

In the embodiment of the present application, the inclination direction of the partition plates 314 is not constant, and the inclination directions of the plurality of partition plates 314 are the same.

In the embodiment of the present application, the partition plate 314 contacts the case 10, and when the case 10 is impacted to press the partition plate 314, the partition plate 314 is inclined to one side, so that the possibility of bending the partition plate 314 is reduced.

In the embodiment of the application, the first heat exchange flow channels 312 in the first plate 311 are separated by the partition 317, and the included angle between the partition 317 and the plate surface of the first plate 311 is also smaller than 90 degrees, when the first plate 311 is pressed, the partition 317 will tilt to an inclined side, so as to reduce the possibility of bending the partition 317.

According to some embodiments of the present application, referring to fig. 5 and 6, the spacing assembly 313 includes a second plate 315, the second plate 315 having a second heat exchange flow channel 316, and a second heat exchange medium located within the second heat exchange flow channel 316. Wherein the coefficient of thermal conductivity of the first heat exchange medium is greater than the coefficient of thermal conductivity of the second heat exchange medium.

In the embodiment of the present application, the second plate 315 is also parallel to the second direction Y.

In some embodiments of the present application, the second heat exchange medium may be gas in the accommodating cavity 11, that is, no additional liquid medium is injected into the second heat exchange flow channel 316.

In the embodiment of the present application, the second plate 315 may also separate the first plate 311 from the box 10, so as to reduce the influence of the box 10 on the first plate 311, and meanwhile, the thermal conductivity of the second heat exchange medium is smaller than that of the first heat exchange medium, so that the heat exchange between the second plate 315 and the box 10 is reduced, and the influence of the box 10 on the first plate 311 can be further reduced.

According to some embodiments of the present application, the first plate 311 and the second plate 315 share the same plate surface.

The first plate 311 and the second plate 315 share the same plate surface, which can reduce the space occupied by the first heat exchange plate 31 and improve the energy density of the battery.

According to some embodiments of the present application, the thermal management component 30 includes a plurality of second heat exchange plates 32, and the average thermal conductivity of the second heat exchange plates 32 gradually decreases in a direction from a middle portion of the plurality of second heat exchange plates 32 to an edge portion of the plurality of second heat exchange plates 32, the direction being parallel to the first direction X.

In the embodiment of the present application, the average heat conductivity of the second heat exchange plates 32 may gradually decrease one by one or may decrease one or more at intervals in the direction of pointing from the middle portion of the plurality of second heat exchange plates 32 to the edge portion of the plurality of second heat exchange plates 32.

In the embodiment of the application, the temperature of the middle battery cell 20 is difficult to adjust, and the average heat conductivity coefficient of the second heat exchange plate 32 is larger when the temperature is closer to the middle battery cell 20, so that the temperature of the middle battery cell 20 is adjusted more quickly, the thermal management effect of the whole battery is more average, and the reliability of the battery is improved.

Fig. 9 is a schematic structural diagram of another first heat exchange plate according to some embodiments of the present application, referring to fig. 9, the first heat exchange plate 31 further includes a first current collector 318 and a second current collector 319, the first current collector 318 and the second current collector 319 are respectively communicated with two ends of the first heat exchange flow channel 312, and the first heat exchange medium can enter the first heat exchange flow channel 312 through one of the first current collector 318 and the second current collector 319 and flow out through the other of the first current collector 318 and the second current collector 319, so as to realize continuous heat management of the first heat exchange plate 31 on the battery cell 20.

In the embodiment of the present application, the second heat exchange plate 32 may also include two current collectors, which are respectively in open communication with both ends of the third heat exchange flow channel, and the third heat exchange medium may enter the third heat exchange flow channel through one of the two current collectors and flow out through the other of the two current collectors, thereby realizing continuous heat management of the battery cells 20 by the second heat exchange plate 32.

According to some embodiments of the application, the first portion 301 comprises a first heat exchanger plate 31 and the second portion 302 comprises a second heat exchanger plate 32, the material of the first heat exchanger plate 31 having a thermal conductivity smaller than the material of the second heat exchanger plate 32.

In another implementation manner of the present application, the first heat exchange plate 31 and the second heat exchange plate 32 have the same structure, but different materials, so that heat exchange between the battery cells 20 of the second heat exchange plate 32 can be achieved, the heat conductivity of the material of the first heat exchange plate 31 is smaller than that of the material of the second heat exchange plate 32, so that heat exchange between the first heat exchange plate 31 and the box 10 is less, the heat management effect of the heat management component 30 on the battery cells 20 can be improved, and the structure of the first heat exchange plate 31 can be simpler.

According to some embodiments of the application, the average thermal conductivity of the first portion 301 is greater than or equal to 0.05W/(m·k) and less than or equal to 40W/(m·k).

The smaller the average thermal conductivity of the first portion 301, the smaller the thermal conductivity of the first portion 301, but the harder the material of the first portion 301 is to be obtained, and the more difficult the manufacturing is. The average thermal conductivity of the first portion 301 is limited to the above range, improving the thermal management effect of the thermal management member 30 on the battery cell 20 while reducing the manufacturing difficulty.

According to some embodiments of the application, the average thermal conductivity of the first portion 301 is greater than or equal to 0.1W/(m·k) and less than or equal to 20W/(m·k).

The average thermal conductivity of the first portion 301 is further defined to further enhance the thermal management of the battery cell 20 by the thermal management component 30 while reducing manufacturing difficulties.

According to some embodiments of the application, the average thermal conductivity of the second portion 302 is greater than or equal to 25W/(m·k) and less than or equal to 200W/(m·k).

The larger the average thermal conductivity of the second portion 302, the more the heat exchange between the small second portion 302 and the battery cell 20 can be increased, but the larger the average thermal conductivity of the second portion 302, the greater the density of the material from which the second portion 302 is made, and the weight of the battery can be increased. The average thermal conductivity of the second portion 302 is limited to the above range, improving the thermal management effect of the thermal management member 30 on the battery cell 20 while reducing the weight of the battery.

According to some embodiments of the application, the average thermal conductivity of the second portion 302 is greater than or equal to 50W/(m·k) and less than or equal to 140W/(m·k).

The average thermal conductivity of the second portion 302 is further defined to further enhance the thermal management effect of the thermal management member 30 on the battery cell 20 while reducing the weight of the battery.

The embodiment of the application provides an electric device, which comprises the battery in any one of the embodiments, wherein the battery is used for providing electric energy.

An embodiment of the present application provides a battery including a case 10, a battery cell 20, and a thermal management component 30, the case 10 having a receiving cavity 11, the battery cell 20 and the thermal management component 30 being located within the receiving cavity 11, the thermal management component 30 including a first portion 301 in contact with the case 10, and a second portion 302 in contact with the battery cell 20. Wherein the average thermal conductivity of the first portion 301 is less than the average thermal conductivity of the second portion 302.

The accommodating cavity 11 includes a plurality of sub-accommodating cavities 111 arranged at intervals along the first direction X, and the battery cells 20 are located in the sub-accommodating cavities 111. The heat management part 30 includes a first heat exchange plate 31 and a second heat exchange plate 32, the first heat exchange plate 31 is located between the inner sidewall of the case 10 and the sub-receiving chamber 111 along the first direction X, and the second heat exchange plate 32 is located between adjacent sub-receiving chambers 111 along the first direction X. The first heat exchanger plate 31 comprises a first plate body 311 and a spacing assembly 313. The first plate 311 is located between the inner sidewall of the case 10 and the sub-receiving chamber 111 along the first direction X, the first plate 311 has a first heat exchange flow channel 312, and a first heat exchange medium located in the first heat exchange flow channel 312, and the spacer assembly 313 is located between the first plate 311 and the inner sidewall of the case 10 along the first direction X. The side of the first plate 311 away from the spacer assembly 313 contacts the battery cell 20, the side of the spacer assembly 313 away from the first plate 311 contacts the case 10, the average thermal conductivity of the spacer assembly 313 is smaller than the average thermal conductivity of the first plate 311, the first portion 301 includes the first plate 311, and the second portion 302 includes the spacer assembly 313. The spacing assembly 313 includes a second plate 315, the second plate 315 having a second heat exchange flow path 316 and a second heat exchange medium disposed within the second heat exchange flow path 316. Wherein the coefficient of thermal conductivity of the first heat exchange medium is greater than the coefficient of thermal conductivity of the second heat exchange medium. The first plate 311 and the second plate 315 share the same plate surface. The first portion 301 has an average thermal conductivity greater than or equal to 0.1W/(mK) and less than or equal to 20W/(mK). The second portion 302 has an average thermal conductivity greater than or equal to 50W/(mK) and less than or equal to 140W/(mK).

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 (14)

1. A battery, the battery comprising:

the box body (10) is provided with a containing cavity (11);

a battery unit (20) positioned in the accommodating cavity (11);

a thermal management member (30) located within the housing cavity (11), the thermal management member (30) comprising a first portion (301) in contact with the case (10), and a second portion (302) in contact with the battery cell (20);

Wherein, the average thermal conductivity of the first portion (301) is smaller than the average thermal conductivity of the second portion (302), the accommodating cavity (11) includes a plurality of sub-accommodating cavities (111) arranged at intervals along a first direction (X), the battery cells (20) are located in the sub-accommodating cavities (111), and the thermal management component (30) includes:

a first heat exchange plate (31), along the first direction (X), the first heat exchange plate (31) being located between an inner side wall of the case (10) and the sub-receiving cavity (111);

-a second heat exchanger plate (32), said second heat exchanger plate (32) being located between adjacent ones of said sub-receiving cavities (111) along said first direction (X);

wherein the average heat conductivity of the first heat exchange plate (31) is smaller than the average heat conductivity of the second heat exchange plate (32), the first portion (301) comprises a portion of the first heat exchange plate (31) in contact with the case (10), and the second portion (302) comprises a portion of the second heat exchange plate (32) in contact with the battery cell (20).

2. A battery according to claim 1, characterized in that the first heat exchanger plate (31) comprises:

A first plate body (311), along the first direction (X), the first plate body (311) being located between an inner sidewall of the case (10) and the sub-receiving chamber (111), the first plate body (311) having a first heat exchange flow passage (312), and a first heat exchange medium located in the first heat exchange flow passage (312);

-a spacer assembly (313), along the first direction (X), the spacer assembly (313) being located between the first plate (311) and an inner side wall of the tank (10);

wherein, one side of first plate body (311) keep away from interval subassembly (313) with battery cell (20) contact, one side of interval subassembly (313) keep away from first plate body (311) with box (10) contact, the average coefficient of heat conduction of interval subassembly (313) is less than the average coefficient of heat conduction of first plate body (311), first part (301) include first plate body (311), second part (302) include interval subassembly (313).

3. The battery according to claim 2, characterized in that the average thermal conductivity of the second heat exchange plate (32) is greater than or equal to the average thermal conductivity of the first plate body (311).

4. The battery according to claim 2, characterized in that the spacer assembly (313) comprises a plurality of spacer plates (314) connected to the first plate body (311), the first heat exchange medium having a thermal conductivity greater than that of the gas in the housing cavity (11).

5. The battery according to claim 4, characterized in that the angle α between the plate face of the spacer plate (314) and the plate face of the first plate body (311) is smaller than 90 degrees.

6. The battery according to claim 2, wherein the spacer assembly (313) comprises:

a second plate body (315) having a second heat exchange flow passage (316), and a second heat exchange medium located within the second heat exchange flow passage (316);

the heat conductivity coefficient of the first heat exchange medium is larger than that of the second heat exchange medium.

7. The battery according to claim 6, wherein the first plate body (311) and the second plate body (315) share the same plate surface.

8. The battery according to any one of claims 1 to 7, wherein the thermal management component (30) comprises a plurality of the second heat exchange plates (32), an average thermal conductivity of the second heat exchange plates (32) gradually decreases in a direction from a middle portion of the plurality of the second heat exchange plates (32) to an edge portion of the plurality of the second heat exchange plates (32), the direction being parallel to the first direction (X).

9. The battery according to any one of claims 1 to 7, wherein the first portion (301) comprises the first heat exchanger plate (31), the second portion (302) comprises the second heat exchanger plate (32), and the material of the first heat exchanger plate (31) has a thermal conductivity smaller than that of the material of the second heat exchanger plate (32).

10. The battery according to any one of claims 1 to 7, wherein the average thermal conductivity of the first portion (301) is greater than or equal to 0.05W/(m-K) and less than or equal to 40W/(m-K).

11. The battery according to claim 10, wherein the average thermal conductivity of the first portion (301) is greater than or equal to 0.1W/(m-K) and less than or equal to 20W/(m-K).

12. The battery according to any one of claims 1 to 7, wherein the second portion (302) has an average thermal conductivity greater than or equal to 25W/(m-K) and less than or equal to 200W/(m-K).

13. The battery according to claim 12, wherein the second portion (302) has an average thermal conductivity greater than or equal to 50W/(m-K) and less than or equal to 140W/(m-K).

14. An electrical device comprising a battery as claimed in any one of claims 1 to 13 for providing electrical energy.