CN216872134U - Battery and electric equipment - Google Patents
Battery and electric equipment Download PDFInfo
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- CN216872134U CN216872134U CN202220351378.6U CN202220351378U CN216872134U CN 216872134 U CN216872134 U CN 216872134U CN 202220351378 U CN202220351378 U CN 202220351378U CN 216872134 U CN216872134 U CN 216872134U
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Abstract
A battery (10) and an electrical device are provided. The battery (10) includes: a plurality of battery cells (20) arranged in a first direction (x); a heat conduction member (101), the heat conduction member (101) extending along the first direction (x) and being connected to a first wall (2111) of each of the plurality of battery cells (20), the first wall (2111) being a wall having a largest surface area in the battery cell (20), the heat conduction member (101) being for conducting heat of the battery cell (20), a surface of the heat conduction member (101) connected to the first wall (2111) being an insulating surface; wherein the dimension of the heat conducting member (101) in a second direction (y) perpendicular to the first wall (2111) is 0.1-100 mm. According to the technical scheme, the performance of the battery can be improved.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery and electric equipment.
Background
With the increasing environmental pollution, the new energy industry is more and more concerned by people. In the new energy industry, battery technology is an important factor regarding its development.
The energy density of the battery is an important parameter in the performance of the battery, however, other performance parameters of the battery need to be considered when improving the energy density of the battery. Therefore, how to improve the performance of the battery is an urgent technical problem to be solved in the battery technology.
SUMMERY OF THE UTILITY MODEL
The application provides a battery and consumer can guarantee the electrical insulation and the heat-conduction in the battery when promoting the energy density of battery to can promote the performance of battery.
In a first aspect, a battery is provided, comprising: a plurality of battery cells arranged in a first direction; a heat conducting member extending in the first direction and connected to a first wall of each of the plurality of battery cells, the first wall having a largest surface area in the battery cell, the heat conducting member being configured to conduct heat of the battery cell, and a surface of the heat conducting member connected to the first wall being an insulating surface; wherein the dimension of the heat conducting piece in a second direction is 0.1-100 mm, and the second direction is perpendicular to the first wall.
In the embodiment of the application, a heat conducting member is arranged in the battery and connected with a first wall with the largest surface area of each battery unit in a row of a plurality of battery units arranged along a first direction, wherein the heat conducting member is used for conducting heat of the battery units, the surface of the heat conducting member connected with the first wall is an insulating surface, and the dimension of the heat conducting member in a second direction perpendicular to the first wall is 0.1-100 mm. Therefore, the middle part of the box body of the battery does not need to be provided with structures such as a beam and the like, and the space utilization rate in the battery can be improved to a greater extent, so that the energy density of the battery is improved; meanwhile, the heat conducting piece can ensure the electrical insulation and the heat conduction in the battery. Therefore, the technical scheme of this application embodiment can guarantee the electrical insulation and the heat-conduction in the battery when promoting the energy density of battery to can promote the performance of battery.
In one possible implementation manner, the heat conduction member includes a metal plate and an insulating layer, and the insulating layer is disposed on a surface of the metal plate. Through this arrangement, the metal plate can ensure the strength of the heat-conducting member, and the insulating layer can make the surface of the heat-conducting member connected with the first wall be an insulating surface.
In one possible implementation, the heat conducting member is a non-metallic material plate.
In one possible implementation, a cavity is provided in the heat-conducting member. The cavity can lighten the weight of the heat-conducting piece while ensuring the strength of the heat-conducting piece, and in addition, the cavity can ensure that the heat-conducting piece has larger compression space in the second direction, thereby providing larger expansion space for the battery monomer.
In one possible implementation, the cavity is used to contain a fluid to regulate the temperature of the battery cell, which can effectively manage the temperature of the battery cell.
In one possible implementation manner, the dimension T1 of the battery cell in the second direction and the dimension T2 of the heat-conducting member in the second direction satisfy: T2/T1 is more than 0 and less than or equal to 7. Therefore, the energy density of the battery can be guaranteed, and the safety performance of the battery can be guaranteed.
In one possible implementation manner, 0 < T2/T1 is less than or equal to 1, so that the energy density of the battery is further improved, and the safety performance of the battery is guaranteed.
In one possible implementation, the weight M1 of the battery cell and the weight M2 of the thermal conduction member satisfy: M2/M1 is more than 0 and less than or equal to 20. Therefore, the weight energy density of the battery can be guaranteed, and the safety performance of the battery can be guaranteed.
In one possible implementation mode, 0.1 is less than or equal to M2/M1 is less than or equal to 1, so that the energy density of the battery is further improved, and the safety performance of the battery is guaranteed.
In one possible implementation, the area S1 of the first wall and the area S2 of the surface of the thermal conductor connected to the first wall of the plurality of battery cells satisfy: 0.2 is less than or equal to S2/S1 is less than or equal to 30. Therefore, the energy density of the battery can be guaranteed, and the safety performance of the battery can be guaranteed.
In one possible implementation mode, 2 ≦ S2/S1 ≦ 10, so as to further improve the energy density of the battery and guarantee the safety performance of the battery.
In one possible implementation, the specific heat capacity Q of the heat-conducting member and the weight M2 of the heat-conducting member satisfy: 0.02 KJ/(kg)2*℃)≤Q/M2≤100KJ/(kg2C). When Q/M2 is less than 0.02 KJ/(kg)2At the temperature of the battery, the heat conducting piece can absorb more energy, so that the temperature of the battery monomer is too low, and lithium separation can be generated; Q/M2 > 100 KJ/(kg)2At deg.c), the heat conducting member has poor heat conducting ability and cannot take away heat in time. 0.02 KJ/(kg)2*℃)≤Q/M2≤100KJ/(kg2And the safety performance of the battery can be guaranteed.
In one possible implementation, 0.3 KJ/(kg)2*℃)≤Q/M2≤20KJ/(kg2C) to further enhance the safety performance of the battery.
In one possible implementation manner, the battery cell includes two first walls oppositely arranged in the second direction and two second walls oppositely arranged in the first direction, wherein in the first direction, the second walls of two adjacent battery cells are opposite. Therefore, the first wall with a large area is connected with the heat conducting piece, so that the heat exchange of the battery monomer is facilitated, and the performance of the battery is guaranteed.
In one possible implementation manner, the battery includes a plurality of rows of the battery cells and the heat conducting members arranged along the first direction, wherein the plurality of rows of the battery cells and the plurality of heat conducting members are alternately arranged in the second direction. Like this, multiseriate battery monomer and a plurality of heat-conducting member interconnect form a whole, hold in the box, can enough carry out effectual heat-conduction to each battery monomer of being listed as, can guarantee the holistic structural strength of battery again to can promote the performance of battery.
In one possible implementation manner, the battery includes a plurality of battery modules, the battery modules include at least one row of the plurality of battery cells arranged along the first direction and at least one heat conduction member, and the at least one row of the battery cells and the at least one heat conduction member are alternately arranged in the second direction.
In a possible implementation manner, the battery module includes N rows of the battery cells and N-1 heat-conducting members, the heat-conducting members are disposed between two adjacent rows of the battery cells, and N is an integer greater than 1. In this way, fewer heat conducting members can be provided in the battery, but at the same time it is ensured that each battery cell can be connected to a heat conducting member.
In one possible implementation manner, a plurality of the battery modules are arranged along the second direction, and a gap is formed between adjacent battery modules. The gap may provide an expansion space for the battery cell.
In a possible realization, the heat-conducting element is glued to the first wall.
In a second aspect, there is provided an electrical device comprising: the battery of the first aspect or any possible implementation manner of the first aspect, wherein the battery is used for providing electric energy.
In a third aspect, a method for preparing a battery is provided, comprising: providing a plurality of battery cells arranged in a first direction; providing a heat conducting member, wherein the heat conducting member extends along the first direction and is connected with a first wall of each of the plurality of battery cells, the first wall is a wall with the largest surface area in the battery cell, the heat conducting member is used for conducting heat of the battery cell, and the surface of the heat conducting member connected with the first wall is an insulating surface; wherein the dimension of the heat conducting piece in a second direction is 0.1-100 mm, and the second direction is perpendicular to the first wall.
In a fourth aspect, there is provided an apparatus for preparing a battery, comprising means for performing the method of the third aspect described above.
According to the technical scheme of the embodiment of the application, the heat conducting piece is arranged in the battery and connected with the first wall with the largest surface area of each battery monomer in a row of the plurality of battery monomers arranged along the first direction, wherein the heat conducting piece is used for conducting the heat of the battery monomers, the surface of the heat conducting piece connected with the first wall is an insulating surface, and the size of the heat conducting piece in the second direction perpendicular to the first wall is 0.1-100 mm. Therefore, the middle part of the box body of the battery does not need to be provided with structures such as a beam and the like, the space utilization rate in the battery can be improved to a large extent, and the energy density of the battery is improved; meanwhile, the heat conducting piece can ensure the electrical insulation and the heat conduction in the battery. Therefore, the technical scheme of this application embodiment can guarantee the electrical insulation and the heat-conduction in the battery when promoting the energy density of battery to can promote the performance of battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.
FIG. 1 is a schematic illustration of a vehicle according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a battery according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a battery cell according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a battery according to an embodiment of the present application;
FIG. 5 is a schematic view of a thermally conductive member according to an embodiment of the present application;
FIG. 6 is a schematic view of a thermally conductive member according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a battery according to an embodiment of the present application;
fig. 8 is a schematic flow chart of a method of manufacturing a battery according to an embodiment of the present application;
fig. 9 is a schematic block diagram of an apparatus for manufacturing a battery according to an embodiment of the present application.
In the drawings, the drawings are not necessarily to scale.
Detailed Description
Embodiments of the present application will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.
In the description of the present application, it is to be noted that, unless otherwise specified, all technical and scientific terms used have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terminology used 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; "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The directional terms used in the following description are intended to refer to directions shown in the drawings, and are not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present 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 pack or the like. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.
The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and an isolating membrane. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is used as a positive pole lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative current collector, and the mass flow body protrusion in the mass flow body of coating the negative pole active substance layer of uncoated negative pole active substance layer, the mass flow body of uncoated negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film can be polypropylene (PP), Polyethylene (PE) or the like. In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.
In order to meet different power requirements, a battery may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. Optionally, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form a battery. That is, a plurality of battery cells may directly constitute a battery, or a battery module may be first constituted and then a battery may be constituted. The battery is further arranged in the electric equipment to provide electric energy for the electric equipment.
The development of battery technology should take into consideration various design factors such as energy density, cycle life, discharge capacity, charge and discharge rate, safety, etc. Under the condition that the internal space of the battery is fixed, the utilization rate of the internal space of the battery is improved, and the method is an effective means for improving the energy density of the battery. However, while improving the utilization of the internal space of the battery, other parameters of the battery, such as insulation and heat conduction, need to be considered.
In view of this, the present disclosure provides a solution, in a battery, a heat conducting member is disposed to be connected to a first wall having a largest surface area of each of a plurality of battery cells arranged in a row along a first direction, wherein the heat conducting member is configured to conduct heat of the battery cells, a surface of the heat conducting member connected to the first wall is an insulating surface, and a dimension of the heat conducting member in a second direction perpendicular to the first wall is 0.1-100 mm. Therefore, the middle part of the box body of the battery does not need to be provided with structures such as a beam and the like, and the space utilization rate in the battery can be improved to a large extent, so that the energy density of the battery is improved; meanwhile, the heat conducting piece can ensure the electrical insulation and the heat conduction in the battery. Therefore, the technical scheme of this application embodiment can guarantee the electrical insulation and the heat-conduction in the battery when promoting the energy density of battery to can promote the performance of battery.
The technical scheme described in the embodiment of the application is applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships, spacecraft and the like, for example, spacecraft includes airplanes, rockets, space airplanes, spacecraft and the like.
It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above-described devices, but may also be applied to all devices using batteries, and for brevity of description, the following embodiments are all described by taking an electric vehicle as an example.
For example, as shown in fig. 1, which is a schematic structural diagram of a vehicle 1 according to an embodiment of the present disclosure, the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10 inside, the controller 30 being used to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operation power supply of the vehicle 1 for a circuit system of the vehicle 1, for example, for power demand for operation at the start, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1 instead of or in part of fuel or natural gas to provide driving power to the vehicle 1.
In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells. For example, as shown in fig. 2, which is a schematic structural diagram of a battery 10 according to an embodiment of the present disclosure, the battery 10 may include a plurality of battery cells 20. The battery 10 may further include a case 11, the inside of the case 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the case 11. For example, a plurality of battery cells 20 are connected in parallel or in series or in a combination of series and parallel to each other and then placed in the case 11.
Optionally, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for electrically connecting the plurality of battery cells 20, such as in parallel or in series-parallel. Specifically, the bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus bar member may be fixed to the electrode terminals of the battery cells 20 by welding. The electric energy of the plurality of battery cells 20 can be further led out through the box body by the conductive mechanism. Alternatively, the conductive means may also belong to the bus bar member.
The number of the battery cells 20 may be set to any number according to different power requirements. A plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve greater capacity or power. Since the number of the battery cells 20 included in each battery 10 may be large, the battery cells 20 may be arranged in groups for convenience of installation, each group of the battery cells 20 constituting a battery module. The number of the battery cells 20 included in the battery module is not limited and may be set as required. The battery may include a plurality of battery modules, which may be connected in series, parallel, or series-parallel.
As shown in fig. 3, which is a schematic structural diagram of a battery cell 20 according to an embodiment of the present disclosure, the battery cell 20 includes one or more electrode assemblies 22, a case 211, and a cover plate 212. The housing 211 and cover 212 form a housing or battery compartment 21. The walls of the housing 211 and the cover plate 212 are referred to as the walls of the battery cell 20, wherein for the cuboid battery cell 20, the walls of the housing 211 include a bottom wall and four side walls. The case 211 is determined according to the shape of one or more electrode assemblies 22 after being combined, for example, the case 211 may be a hollow rectangular parallelepiped or a square or a cylinder, and one of the faces of the case 211 has an opening so that one or more electrode assemblies 22 can be placed in the case 211. For example, when the housing 211 is a hollow rectangular parallelepiped or square, one of the planes of the housing 211 is an open plane, i.e., the plane has no wall body so that the housing 211 communicates inside and outside. When the housing 211 may be a hollow cylinder, the end surface of the housing 211 is an open surface, i.e., the end surface has no wall body so that the housing 211 is communicated with the inside and the outside. The cap plate 212 covers the opening and is connected with the case 211 to form a closed cavity in which the electrode assembly 22 is placed. The case 211 is filled with an electrolyte, such as an electrolytic solution.
The battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 may be disposed on the cap plate 212. The cap plate 212 is generally in the shape of a flat plate, and two electrode terminals 214 are fixed to the flat plate surface of the cap plate 212, the two electrode terminals 214 being a positive electrode terminal 214a and a negative electrode terminal 214b, respectively. One connecting member 23, which may also be referred to as a current collecting member 23, is disposed at each of the electrode terminals 214 between the cap plate 212 and the electrode assembly 22 to electrically connect the electrode assembly 22 and the electrode terminals 214.
As shown in fig. 3, each electrode assembly 22 has a first tab 221a and a second tab 222 a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. The first tab 221a of one or more electrode assemblies 22 is connected with one electrode terminal by one connecting member 23, and the second tab 222a of one or more electrode assemblies 22 is connected with the other electrode terminal by the other connecting member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab through one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab through the other connecting member 23.
In the battery cell 20, the electrode assembly 22 may be provided singly or in plurality according to actual use requirements, and as shown in fig. 3, 4 independent electrode assemblies 22 are provided in the battery cell 20.
The battery cell 20 may also be provided with a pressure relief mechanism 213. The pressure relief mechanism 213 is actuated to relieve the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value.
The pressure relief mechanism 213 may be any of various possible pressure relief structures, which are not limited in the embodiments of the present application. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to be melted when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and/or, pressure relief mechanism 213 may be a pressure sensitive pressure relief mechanism configured to rupture when the internal air pressure of battery cell 20 in which pressure relief mechanism 213 is disposed reaches a threshold value.
Fig. 4 shows a schematic diagram of the structure of the battery 10 according to an embodiment of the present application.
The battery 10 includes a plurality of battery cells 20 arranged in a first direction x and a heat conductive member 101.
The first direction x is an arrangement direction of a row of the battery cells 20 in the battery 10. That is, a row of the battery cells 20 in the battery 10 is arranged in the x direction. The number of the battery cells 20 in a row of the battery cells 20 may be 2-20, but the embodiment of the present application is not limited thereto.
The heat conduction member 101 extends in the first direction x and is connected to a first wall 2111 of each of the plurality of battery cells 20, the first wall 2111 being a wall having the largest surface area in the battery cell 20.
The battery cell 20 may include a plurality of walls, and the first wall 2111 having the largest surface area in the battery cell 20 is connected to the heat conductive member 101. That is, the first wall 2111 of the battery cell 20 faces the heat conductive member 101, i.e., the first wall 2111 of the battery cell 20 is parallel to the first direction x.
The heat-conducting member 101 serves to conduct heat of the battery cell 20, and a surface of the heat-conducting member 101 connected to the first wall 2111 is an insulating surface. The heat of the battery cell 20 is conducted by the heat-conducting member 101, so that the temperature of the battery cell 20 can be maintained in a normal state. The surface of the heat-conducting member 101 connected to the first wall 2111 is an insulating surface, which ensures electrical insulation between the heat-conducting member 101 and the battery cell 20.
The dimension of the heat-conducting member 101 in the second direction y is 0.1-100 mm, and the second direction y is perpendicular to the first wall 2111.
In the embodiment of the present application, the heat conduction member 101 is provided in the battery 10 so as to be connected to the first wall 2111 having the largest surface area of each of the plurality of battery cells 20 arranged in the row in the first direction x. Therefore, the middle part of the box body 11 of the battery 10 does not need to be provided with a beam and other structures, and the space utilization rate inside the battery 10 can be improved to a large extent, so that the energy density of the battery 10 is improved.
Accordingly, in order to ensure the performance of the battery 10, the heat-conductive member 101 should have a high strength. In the embodiment of the present application, when the dimension T2 of the heat conducting member 101 in the second direction y is 0.1-100 mm, both the strength and the space requirement can be satisfied.
Specifically, the dimension T2 of the heat-conducting member 101 in the second direction y, that is, the thickness of the heat-conducting member 101, is large, the strength of the heat-conducting member 101 is high; when T2 is small, it takes up little space. When T2 is less than 0.1mm, the heat-conducting member 101 is easily damaged by external force; when T2 > 100mm, too much space is occupied, affecting the energy density. Therefore, when the dimension T2 of the heat conducting member 101 in the second direction y is 0.1-100 mm, the space utilization rate can be improved while the strength is ensured.
In the embodiment of the application, the heat conduction member 101 is arranged in the battery 10 and connected with the first wall 2111 with the largest surface area of each battery cell 20 in a row of the plurality of battery cells 20 arranged along the first direction x, wherein the heat conduction member 101 is used for conducting heat of the battery cells 20, the surface of the heat conduction member 101 connected with the first wall 2111 is an insulating surface, and the dimension of the heat conduction member 101 in the second direction y perpendicular to the first wall 2111 is 0.1-100 mm. Therefore, the middle part of the box body 11 of the battery 10 does not need to be provided with structures such as beams, and the like, and the space utilization rate in the battery 10 can be improved to a large extent, so that the energy density of the battery 10 is improved; at the same time, the electrical insulation and the heat conduction in the battery 10 can be secured by the above-described heat-conductive member 101. Therefore, the technical solution of the embodiment of the present application can ensure electrical insulation and heat conduction in the battery 10 while improving the energy density of the battery 10, thereby improving the performance of the battery 10.
Alternatively, in one embodiment of the present application, the heat-conducting member 101 may be a non-metallic material plate. That is, the heat conductive member 101 is entirely a non-metallic insulating material.
Alternatively, in one embodiment of the present application, the heat conductive member 101 may include a metal plate and an insulating layer disposed on a surface of the metal plate.
Fig. 5 is a schematic view of a heat-conducting member 101 according to an embodiment of the present application. As shown in fig. 5, the heat conducting member 101 includes a metal plate 1011 and an insulating layer 1012, and the insulating layer 1012 is disposed on the surface of the metal plate 1011. With this arrangement, the metal plate 1011 can secure the strength of the heat conductive member 101, and the insulating layer 1012 can make the surface of the heat conductive member 101 connected to the first wall 2111 an insulating surface. Alternatively, the insulating layer 1012 may be an insulating film adhered to the surface of the metal plate 1011 or an insulating varnish coated on the surface of the metal plate 1011.
Alternatively, in one embodiment of the present application, as shown in fig. 6, a cavity 1013 may be provided in the heat conductive member 101. The cavity 1013 can reduce the weight of the heat-conductive member 101 while ensuring the strength of the heat-conductive member 101, and is applicable to a case where the thickness T2 of the heat-conductive member 101 is large, for example. In addition, the cavity 1013 may allow the thermal conductive member 101 to have a large compression space in the second direction y, so that a large expansion space may be provided for the battery cell 20.
Optionally, in one embodiment of the present application, the cavity 1013 may be used to contain a fluid to regulate the temperature of the battery cell 20.
The fluid may be a liquid or a gas, and adjusting the temperature means heating or cooling the plurality of battery cells 20. In the case of cooling the battery cells 20, the cavity 1013 may contain a cooling medium to adjust the temperature of the plurality of battery cells 20, and at this time, the fluid may also be referred to as a cooling medium or a cooling fluid, and more specifically, may be referred to as a cooling liquid or a cooling gas. In addition, the fluid may also be used for heating, which is not limited in the embodiments of the present application. Alternatively, the fluid may be circulated for better temperature regulation. Alternatively, the fluid may be water, a mixture of water and glycol, refrigerant, air, or the like.
Optionally, in an embodiment of the present application, the dimension T1 of the battery cell 20 in the second direction y and the dimension T2 of the heat-conducting member 101 in the second direction y satisfy: T2/T1 is more than 0 and less than or equal to 7.
When T2/T1 is too large, the heat-conducting member 101 occupies a large space, affecting the energy density. In addition, the heat-conducting member 101 conducts heat to the battery cell 20 too quickly, which may also cause a safety problem. For example, when one battery cell 20 thermally runaway, it is possible to cause thermal runaway of other battery cells 20 connected to the same heat conductive member 101. When T2/T1 is more than 0 and less than or equal to 7, the energy density of the battery 10 can be guaranteed, and the safety performance of the battery 10 can be guaranteed.
Optionally, in an embodiment of the present application, the size T1 of the battery cell 20 in the second direction y and the size T2 of the heat conduction member 101 in the second direction y may further satisfy 0 < T2/T1 ≦ 1, so as to further increase the energy density of the battery 10 and ensure the safety performance of the battery 10.
Optionally, in an embodiment of the present application, the weight M1 of the battery cell 20 and the weight M2 of the thermal conductive member 101 satisfy: M2/M1 is more than 0 and less than or equal to 20.
When M2/M1 is too large, the weight energy density is lost. When M2/M1 is more than 0 and less than or equal to 20, the weight energy density of the battery 10 can be guaranteed, and the safety performance of the battery 10 can be guaranteed.
Optionally, in an embodiment of the present application, the weight M1 of the battery cell 20 and the weight M2 of the heat conducting member 101 may further satisfy 0.1 ≦ M2/M1 ≦ 1, so as to further increase the energy density of the battery 10 and ensure the safety performance of the battery 10.
Alternatively, in one embodiment of the present application, the area S1 of the first wall 2111 and the area S2 of the surface of the heat conductive member 101 connected to the first walls 2111 of the plurality of battery cells 20 in a row satisfy: 0.2 is less than or equal to S2/S1 is less than or equal to 30.
S2 is the total area of the side surface of the heat-conductive member 101 to which the battery cell 20 is connected. When S2/S1 is too large, the energy density is affected. When S2/S1 is too small, the heat conduction effect is too poor, and the safety performance is affected. When S2/S1 is not less than 0.2 and not more than 30, the energy density of the battery 10 can be guaranteed, and the safety performance of the battery 10 can be guaranteed.
Optionally, in an embodiment of the present application, S2 and S1 may further satisfy 2 ≦ S2/S1 ≦ 10, so as to further increase the energy density of the battery 10 and ensure the safety performance of the battery 10.
Alternatively, in one embodiment of the present application, the specific heat capacity Q of the heat-conducting member 101 and the weight M2 of the heat-conducting member 101 satisfy: 0.02 KJ/(kg)2*℃)≤Q/M2≤100KJ/(kg2*℃)。
When Q/M2 is less than 0.02 KJ/(kg)2At about c), the heat conducting member 101 may absorb more energy, resulting in a too low temperature of the battery cell 20, which may cause lithium precipitation; Q/M2 > 100 KJ/(kg)2At deg.c), the heat conducting member 101 has poor heat conducting ability and cannot take away heat in time. 0.02 KJ/(kg)2*℃)≤Q/M2≤100KJ/(kg2At deg.c), the safety of the battery 10 can be secured.
Optionally, in an embodiment of the present application, Q and M2 may further satisfy 0.3 KJ/(kg)2* ℃)≤Q/M2≤20KJ/(kg2C) to further enhance the safety performance of the battery 10.
Optionally, in an embodiment of the present application, the battery cell 20 includes two first walls 2111 oppositely disposed in the second direction y and two second walls 2112 oppositely disposed in the first direction x, wherein the second walls 2112 of two adjacent battery cells 20 are opposite in the first direction x. That is, with respect to the prismatic battery cell 20, the large side surface thereof, i.e., the first wall 2111 is connected to the heat conductive member 101, and the small side surface thereof, i.e., the second wall 2112 is connected to the second wall 2112 of the adjacent battery cell 20 so as to be arranged in a row in the first direction x. In this way, the first wall 2111 with a large area is connected to the heat conducting member 101, which is beneficial to heat exchange of the battery cell 20 and ensures the performance of the battery 10.
Alternatively, in an embodiment of the present application, the battery 10 includes a plurality of rows of the plurality of battery cells 20 and the plurality of heat-conducting members 101 arranged along the first direction x, wherein the plurality of rows of the battery cells 20 and the plurality of heat-conducting members 101 are alternately arranged in the second direction y. That is, the plurality of rows of the battery cells 20 and the plurality of heat-conducting members 101 may be provided in the form of the heat-conducting member 101, the row of the battery cells 20, and the heat-conducting member 101 …, or in the form of the row of the battery cells 20, the heat-conducting member 101, and the row … of the battery cells 20. Like this, multiseriate battery monomer 20 and a plurality of heat-conducting member 101 interconnect form a whole, hold in box 11, can enough carry out effectual heat-conduction to each battery monomer 20, can guarantee the holistic structural strength of battery 10 again to can promote the performance of battery 10.
Fig. 7 shows a schematic view of the structure of a battery 10 according to another embodiment of the present application. As shown in fig. 7, the battery 10 may include a plurality of battery modules 100. The battery module 100 may include at least one row of the plurality of battery cells 20 arranged in the first direction x and at least one heat conduction member 101, and the at least one row of the battery cells 20 and the at least one heat conduction member 101 are alternately disposed in the second direction y. That is, for each of the battery modules 100 in which the rows of the battery cells 20 and the heat conductive members 101 are alternately arranged in the second direction y, a plurality of the battery modules 100 are accommodated in the case 11 to form the battery 10.
Alternatively, the battery module 100 may include N rows of the battery cells 20 and N-1 heat-conducting members 101, the heat-conducting members 101 being disposed between two adjacent rows of the battery cells 20, N being an integer greater than 1. That is, the heat conductive member 101 is disposed inside the battery module 100, and the heat conductive member 101 is not disposed outside the battery module 100. For example, one heat-conducting member 101 is disposed between two rows of the battery cells 20, two heat-conducting members 101 are disposed between three rows of the battery cells 20, and so on.
Alternatively, in one embodiment of the present application, as shown in fig. 7, the battery module 100 includes two rows of battery cells 20, i.e., N is 2. Accordingly, one heat-conducting member 101 is provided in two rows of the battery cells 20. The heat-conductive members 101 are not provided between the adjacent battery modules 100, so that this embodiment can provide fewer heat-conductive members 101 in the battery 10, while ensuring that each battery cell 20 can be connected to the heat-conductive members 101.
Alternatively, in one embodiment of the present application, the plurality of battery modules 100 are arranged along the second direction y with a gap between adjacent battery modules 100. The heat conductive members 101 are not provided between the adjacent battery modules 100 with a certain gap therebetween. The gap between the adjacent battery modules 100 may provide an expansion space for the battery cell 20.
Alternatively, the end of the heat-conducting member 101 in the first direction x is provided with a fixing structure, and the heat-conducting member 101 is fixed to the case 11 by the fixing structure. As shown in fig. 7, the fixing structure may include a fixing plate 104, and the fixing plate 104 is fixedly connected to an end of the heat-conducting member 101 and is connected to the battery cell 20 located at the end of the heat-conducting member 101, so as to enhance the fixing effect of the battery cell 20.
Optionally, in one embodiment of the present application, the thermal conductor member 101 is bonded to the first wall 2111. That is, the heat conducting member 101 and the battery cell 20 may be fixedly connected by bonding, for example, structural adhesive, but the embodiment of the present application is not limited thereto.
Alternatively, the battery cells 20 may be adhesively fixed to the case 11. Alternatively, adjacent battery cells 20 in each row of battery cells 20 may be bonded, for example, the second walls 2112 of two adjacent battery cells 20 are bonded by structural adhesive, but the embodiment of the present application is not limited thereto. The fixing effect of the battery cells 20 may be further enhanced by the adhesive fixation between the adjacent battery cells 20 in each row of the battery cells 20.
It should be understood that relevant portions in the embodiments of the present application may be mutually referred, and are not described again for brevity.
An embodiment of the present application further provides a power consumption device, which may include the battery 10 in the foregoing embodiment. Optionally, the electric device may be a vehicle 1, a ship, a spacecraft, or the like, but the embodiment of the present application is not limited thereto.
The battery 10 and the electric device according to the embodiment of the present application are described above, and the method and the device for manufacturing the battery according to the embodiment of the present application will be described below, wherein the parts not described in detail can be referred to the foregoing embodiments.
Fig. 8 shows a schematic flow diagram of a method 300 of preparing a battery according to one embodiment of the present application. As shown in fig. 8, the method 300 may include:
310 providing a plurality of battery cells 20 arranged in a first direction x;
320, providing a heat conduction member 101, wherein the heat conduction member 101 extends along the first direction x and is connected with a first wall 2111 of each battery cell 20 in the plurality of battery cells 20, the first wall 2111 is the wall with the largest surface area in the battery cell 20, the heat conduction member 101 is used for conducting heat of the battery cell 20, and the surface of the heat conduction member 101 connected with the first wall 2111 is an insulating surface; the dimension of the heat conduction member 101 in a second direction y is 0.1-100 mm, and the second direction y is perpendicular to the first wall 2111.
Fig. 9 shows a schematic block diagram of an apparatus 400 for preparing a battery according to an embodiment of the present application. As shown in fig. 9, the apparatus 400 for preparing a battery may include:
a first providing module 410 for providing a plurality of battery cells 20 arranged along a first direction x;
a second providing module 420, configured to provide a heat conduction member 101, where the heat conduction member 101 extends along the first direction x and is connected to a first wall 2111 of each of the plurality of battery cells 20, the first wall 2111 is a wall with a largest surface area in the battery cell 20, the heat conduction member 101 is configured to conduct heat of the battery cell 20, and a surface of the heat conduction member 101 connected to the first wall 2111 is an insulating surface; the dimension of the heat conduction member 101 in a second direction y is 0.1-100 mm, and the second direction y is perpendicular to the first wall 2111.
Hereinafter, examples of the present application will be described. The following embodiments are described as illustrative only and are not to be construed as limiting the present application. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.
The battery cells 20 and the heat conducting members 101 shown in the attached drawings are adopted, wherein the number of the battery cells 20 in a row of the battery cells 20 is 2-20, the safety test is carried out on the battery 10 according to GB38031-2020, and the test results are shown in tables 1-4.
TABLE 1
| Numbering | T2/mm | T1/mm | T2/T1 | Test results |
| 1 | 0.2 | 40 | 0.005 | Without fire or explosion |
| 2 | 0.4 | 50 | 0.008 | Without fire or explosion |
| 3 | 0.7 | 45 | 0.016 | Without fire or explosion |
| 4 | 4 | 10 | 0.4 | Without fire or explosion |
| 5 | 4 | 40 | 0.1 | Without fire or explosion |
| 6 | 45 | 15 | 3 | No fire and explosion |
| 7 | 150 | 10 | 15 | Fire and explosion |
TABLE 2
| Numbering | M2/Kg | M1/Kg | M2/M1 | Test results |
| 1 | 0.2 | 3 | 0.068 | Without fire or explosion |
| 2 | 0.4 | 2.5 | 0.16 | Without fire or explosion |
| 3 | 0.7 | 1.5 | 0.467 | Without fire or explosion |
| 4 | 10 | 1.5 | 6.7 | Without fire or explosion |
| 5 | 15 | 1 | 15 | Without fire or explosion |
TABLE 3
| Numbering | S2/mm2 | S1/mm2 | S2/S1 | Test results |
| 1 | 3120 | 21728 | 0.14 | Fire and explosion |
| 2 | 19500 | 38800 | 0.5 | Without fire or explosion |
| 3 | 65000 | 16800 | 3.87 | Without fire or explosion |
| 4 | 130000 | 16576 | 7.84 | Without fire or explosion |
| 5 | 216000 | 9600 | 22.5 | Without fire or explosion |
| 6 | 250000 | 7200 | 34.72 | Fire and explosion |
TABLE 4
| Numbering | Q/KJ/(Kg*℃) | M2/kg | Q/M2(KJ/(kg2*℃)) | |
| 1 | 0.39 | 25 | 0.016 | Fire and explosion |
| 2 | 0.46 | 5 | 0.092 | Without fire or explosion |
| 3 | 0.88 | 0.5 | 1.76 | Without fire or explosion |
| 4 | 4 | 0.4 | 10 | Without fire or explosion |
| 5 | 4 | 0.1 | 40 | Without fire or explosion |
| 6 | 4 | 0.025 | 160 | Fire and explosion |
As can be seen from the above test results, the battery 10 provided in the present application can satisfy the safety performance requirements.
While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.
Claims (20)
1. A battery, comprising:
a plurality of battery cells (20) arranged in a first direction (x);
a heat conduction member (101), the heat conduction member (101) extending along the first direction (x) and being connected to a first wall (2111) of each of the plurality of battery cells (20), the first wall (2111) being a wall having a largest surface area in the battery cell (20), the heat conduction member (101) being for conducting heat of the battery cell (20), a surface of the heat conduction member (101) connected to the first wall (2111) being an insulating surface;
wherein the dimension of the heat conducting member (101) in a second direction (y) perpendicular to the first wall (2111) is 0.1-100 mm.
2. The battery according to claim 1, wherein the heat conductive member (101) comprises a metal plate (1011) and an insulating layer (1012), and the insulating layer (1012) is provided on a surface of the metal plate (1011).
3. The battery according to claim 1, wherein the heat conducting member (101) is a non-metallic material plate.
4. The battery according to claim 1, wherein a cavity (1013) is provided in the heat conducting member (101).
5. The battery according to claim 4, characterized in that the cavity (1013) is used to contain a fluid to regulate the temperature of the battery cell (20).
6. The battery according to claim 1, wherein a dimension T1 of the battery cell (20) in the second direction (y) and a dimension T2 of the thermal conductor member (101) in the second direction (y) satisfy: T2/T1 is more than 0 and less than or equal to 7.
7. The battery of claim 6, wherein 0 < T2/T1 ≦ 1.
8. The battery according to claim 1, wherein the weight M1 of the battery cell (20) and the weight M2 of the thermal conductor (101) satisfy: M2/M1 is more than 0 and less than or equal to 20.
9. The battery according to claim 8, wherein 0.1. ltoreq. M2/M1. ltoreq.1.
10. The battery according to claim 1, wherein an area S1 of the first wall (2111) and an area S2 of a surface of the heat conductive member (101) connected to the first wall (2111) of the plurality of battery cells (20) satisfy: 0.2 is less than or equal to S2/S1 is less than or equal to 30.
11. The battery according to claim 10, wherein 2. ltoreq. S2/S1. ltoreq.10.
12. The battery according to claim 1, wherein the specific heat capacity Q of the heat-conducting member (101) and the weight M2 of the heat-conducting member (101) satisfy: 0.02 KJ/(kg)2*℃)≤Q/M2≤100KJ/(kg2*℃)。
13. The battery of claim 12, wherein 0.3 KJ/(kg)2*℃)≤Q/M2≤20KJ/(kg2*℃)。
14. The battery according to claim 1, wherein the battery cell (20) comprises two first walls (2111) oppositely arranged in the second direction (y) and two second walls (2112) oppositely arranged in the first direction (x), wherein in the first direction (x) the second walls (2112) of two adjacent battery cells (20) are opposite.
15. The battery according to any one of claims 1 to 14, wherein the battery comprises a plurality of rows of the plurality of battery cells (20) and the plurality of heat-conducting members (101) arranged in the first direction (x), wherein the plurality of rows of the battery cells (20) and the plurality of heat-conducting members (101) are alternately arranged in the second direction (y).
16. The battery according to any one of claims 1 to 14, wherein the battery comprises a plurality of battery modules (100), wherein the battery modules (100) comprise at least one row of the plurality of battery cells (20) arranged in the first direction (x) and at least one heat-conducting member (101), and wherein the at least one row of the battery cells (20) and the at least one heat-conducting member (101) are alternately arranged in the second direction (y).
17. The battery according to claim 16, wherein the battery module (100) comprises N rows of the battery cells (20) and N-1 heat-conducting members (101), the heat-conducting members (101) being disposed between two adjacent rows of the battery cells (20), N being an integer greater than 1.
18. The battery according to claim 16, wherein a plurality of the battery modules (100) are arranged in the second direction (y) with a gap between adjacent battery modules (100).
19. The battery according to claim 1, wherein the heat conducting member (101) is bonded to the first wall (2111).
20. An electrical device, comprising: the battery (10) according to any one of claims 1 to 19, said battery (10) being for providing electrical energy.
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| CN202220351378.6U CN216872134U (en) | 2022-02-21 | 2022-02-21 | Battery and electric equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116154358A (en) * | 2023-04-17 | 2023-05-23 | 宁德时代新能源科技股份有限公司 | Battery and electric equipment |
| WO2024077631A1 (en) * | 2022-10-14 | 2024-04-18 | 宁德时代新能源科技股份有限公司 | Battery and electric device |
| WO2024077634A1 (en) * | 2022-10-14 | 2024-04-18 | 宁德时代新能源科技股份有限公司 | Battery and electric device |
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2022
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024077631A1 (en) * | 2022-10-14 | 2024-04-18 | 宁德时代新能源科技股份有限公司 | Battery and electric device |
| WO2024077634A1 (en) * | 2022-10-14 | 2024-04-18 | 宁德时代新能源科技股份有限公司 | Battery and electric device |
| CN116154358A (en) * | 2023-04-17 | 2023-05-23 | 宁德时代新能源科技股份有限公司 | Battery and electric equipment |
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