Battery module and manufacturing method thereof, battery, power consumption device and energy storage device

Abstract

The embodiments of the present application disclose a battery module and a manufacturing method thereof, a battery, an electrical device and an energy storage device. The battery module includes a plurality of battery cells, and the battery cells include: a shell, which contains an electrode assembly, and the shell includes a plurality of outer surfaces; a heating assembly, which is formed on the first surface, and the heating assembly includes a first insulating layer, a heating unit and a second insulating layer which are stacked, and the heating unit is located between the first insulating layer and the second insulating layer and is connected to the power supply connection structure, and the power supply connection structure includes a contact electrode and a contact terminal; the heating unit includes at least one heating resistor, and the thickness of the heating unit in the direction perpendicular to the outer surface where the heating unit is located is between 1 micron and 150 microns, and the battery cells are arranged into a battery module in a manner that the first surface is opposite to each other, and the contact electrodes and the contact terminals are in contact with each other and electrically connected. Thus, a battery module, a battery, an electrical device and an energy storage device with good environmental adaptability can be provided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery module and a manufacturing method thereof, a battery, an electrical device and an energy storage device. Background Art

[0002] New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in the field of energy storage. In new energy vehicles equipped with batteries, batteries can be used to provide power in whole or in part. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side. In these application scenarios, the performance of batteries is affected by the operating temperature.

[0003] In order to improve the performance of the battery, it is sometimes necessary to heat the battery cells in the battery. How to heat the battery cells to improve the adaptability to the use environment is one of the research topics in the industry. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a battery module and a manufacturing method thereof, a battery, an electrical device and an energy storage device that have good adaptability to the use environment and little impact on assembly. The present application is implemented through the following technical solutions.

[0005] The first aspect of the present application provides a battery module, which includes: a shell, which accommodates an electrode assembly, and the shell includes multiple outer surfaces; a heating assembly, formed on at least one of the outer surfaces, and the heating assembly includes a first insulating layer, a heating unit, and a second insulating layer that are stacked, and the heating unit is located between the first insulating layer and the second insulating layer, and the heating unit is connected to a power supply connection structure; wherein the heating unit includes at least one heating resistor, and the thickness of the heating unit in a direction perpendicular to the outer surface where the heating unit is located is between 1 micron and 150 microns.

[0006] Since the surface of the battery cell shell has a heating component, the battery cell can be heated, and even if the battery cell works in a low temperature environment, it can still have good working performance, so it has good environmental adaptability. Moreover, since the heating unit heats the battery cell by heating the heating resistor, it has the advantages of fast heating and small space occupied by the heating unit. The micron-level resistor has very little effect on the outline of the battery cell, and can not increase the assembly size of the battery module or battery module, which is conducive to keeping the original outline size of the battery module or battery module, and is conducive to suppressing the reduction of the volume utilization rate of the battery.

[0007] In some embodiments, there are multiple heating resistors, and on the same outer surface, the multiple heating resistors are arranged in an array.

[0008] This helps to heat multiple locations on the outer surface of the battery cell, heating quickly and evenly. Moreover, even if the number of heating resistors is increased, the outer contour size of the battery cell will not change significantly.

[0009] In some embodiments, the heating unit also includes a heating positive wire and a heating negative wire for being electrically connected to a heating power supply, and each of the heating resistors has a positive terminal and a negative terminal, the positive terminal is electrically connected to the heating positive wire, and the negative terminal is electrically connected to the heating negative wire.

[0010] A plurality of heating resistors can be connected in series and / or in parallel through the heating positive wire and the heating negative wire, thereby being easily electrically connected to a heating power supply, helping to simplify the circuit structure and increase the freedom of positional arrangement of the heating power supply.

[0011] In some embodiments, the heating unit is formed by printing.

[0012] Since the printing method of forming the heating unit helps to make the metal wire of the heating resistor thinner, it helps to reduce the size of the space occupied by the heating unit. This can save the assembly size of the battery module or battery module, and is beneficial for maintaining the original outline size of the battery module or battery module, thereby reducing the reduction in the volume utilization of the battery.

[0013] In some embodiments, the heating assembly is stacked with the outer surface, and the first insulating layer is located between the outer surface and the heating unit.

[0014] This can insulate the heating assembly from the battery cells, reducing the risk to the battery cells.

[0015] In some embodiments, the plurality of outer surfaces include a first outer surface, the first outer surface is a surface with the largest area among the plurality of outer surfaces, and the heating component is formed at least on the first outer surface.

[0016] By arranging the heating assembly at least on the large surface of the battery cell, it is helpful to improve the heating speed and heating uniformity of the battery cell. Forming the heating assembly on more outer surfaces is conducive to further improving the heating speed and heating uniformity of the battery cell.

[0017] In some embodiments, the multiple outer surfaces include first outer surfaces opposite to each other along a first direction, second outer surfaces opposite to each other along a second direction, and third outer surfaces opposite to each other along a third direction, the first outer surface, the second outer surface and the third outer surface are connected to each other, wherein the first outer surface is the surface with the largest area among the multiple outer surfaces, a pole of the battery cell is formed on one of the two third outer surfaces, the first direction, the second direction and the third direction are perpendicular to each other, the heating component is formed on the first outer surface and the second outer surface, or the heating component is formed on the first outer surface, the second outer surface and the other of the two third outer surfaces.

[0018] Depending on the situation, a heating component can be set on the side or the side and bottom of the battery cell to help improve the heating speed and heating uniformity.

[0019] In some embodiments, the material of the first insulating layer includes an aluminum oxide ceramic coating, an aluminum oxide ceramic and titanium oxide composite powder coating, a polymer ceramic polymer coating or a nano ceramic coating; and / or, the material of the heating unit includes copper, silver, gold or platinum; and / or, the second insulating layer includes a photosensitive packaging glue layer.

[0020] This can effectively insulate the heating unit from the battery cell and surrounding components, and is conducive to forming micron-level printed resistors through printing.

[0021] In some embodiments, the power supply connection structure includes an interconnection component for electrically connecting the heating unit to the heating unit or the heating power source of the adjacent battery cell, and the interconnection component includes a contact electrode and a contact terminal.

[0022] This makes it easy to interconnect the heating units on multiple battery cells, and even if a heating power supply is not provided for each battery cell, the heating components of each battery cell can be powered, which helps to reduce the space occupied by the heating power supply and improve the volume utilization of the battery.

[0023] In some embodiments, the contact terminal includes a conductive metal elastic sheet, and the metal elastic sheet is configured to generate an elastic force when pressed.

[0024] The interconnection between the heating components of each battery cell is achieved through a metal elastic sheet with a certain elasticity, which helps to improve the reliability and stability of the connection.

[0025] In some embodiments, the battery module further comprises a power connector for electrically connecting to a power source for heating and configured to be electrically connected to the power supply connection structure in the heating assembly of at least one of the battery cells.

[0026] By equipping the battery module with a power connector, the heating components of each battery cell in the entire battery module can be powered and heated, and the connection with the heating power source is convenient.

[0027] In some embodiments, the number of battery cells is more than two; the power connector is provided on one or a part of the battery cells and is configured to be electrically connected to the power supply connection structure in the heating assembly of the battery cell provided with the power connector; the heating unit of the battery cell provided with the power connector is at least electrically connected to the heating unit of the adjacent battery cell not provided with the power connector.

[0028] In this way, a small number of power connectors can be used to power and heat the heating components of each battery cell in the entire battery module, which helps to reduce the number of parts, reduces operation time, and helps to reduce the space occupied by power connectors and heating power supplies.

[0029] In some embodiments, the power connector includes a socket provided with a positive conductive terminal and a negative conductive terminal; or, the power connector includes a plug provided with a positive conductive terminal and a negative conductive terminal.

[0030] The power supply connection piece has a simple structure, and the connection operation with the heating power supply is also simple.

[0031] A second aspect of the present application provides a battery, which includes a housing and at least one battery module provided by the first aspect of the present application accommodated in the housing.

[0032] This makes it possible to provide a battery with good environmental adaptability.

[0033] A third aspect of the present application provides an electrical device, which includes the battery module provided in the first aspect of the present application or the battery provided in the second aspect of the present application for providing electrical energy.

[0034] This can improve the adaptability of the electrical device to the environment.

[0035] The fourth aspect of the present application provides an energy storage device, which includes the battery module provided in the first aspect of the present application or the battery provided in the second aspect of the present application, which is capable of storing electrical energy and providing electrical energy.

[0036] This can improve the adaptability of the energy storage device to the environment.

[0037] The fifth aspect of the present application provides a battery module manufacturing method, which is used to manufacture the battery module provided in the first aspect of the present application, and the battery module manufacturing method includes: the step of forming the first insulating layer on at least one of the outer surfaces of the shell; the step of printing the heating unit on the first insulating layer, wherein the thickness of the heating unit in the direction perpendicular to the outer surface where the heating unit is located is between 1 micron and 150 microns; and the step of forming the second insulating layer on the first insulating layer formed with the heating unit.

[0038] This makes it possible to provide a battery cell that has good environmental adaptability and little influence on assembly.

[0039] In some embodiments, the step of forming the first insulating layer includes: applying an insulating coating on at least one of the outer surfaces of the housing to form the first insulating layer.

[0040] This can reduce the risk of electrical conductivity between the heating unit and the housing of the battery cell.

[0041] In some embodiments, the step of forming the second insulating layer on the first insulating layer having the heating unit formed thereon includes: coating the first insulating layer having the heating unit with a photosensitive encapsulation adhesive layer; and irradiating light to the photosensitive encapsulation adhesive layer to cure the photosensitive encapsulation adhesive layer.

[0042] This makes it possible to form an insulating layer with good insulating properties.

[0043] In some embodiments, the battery module manufacturing method further includes: forming a contact electrode and a contact terminal electrically connected to the heating unit of the battery cell on the second insulating layer, the contact electrode being used to electrically connect to the contact terminal of an adjacent battery cell.

[0044] This can provide a battery cell having a simple structure and in which the heating units on adjacent battery cells can be electrically connected to each other, so that a plurality of battery cells can be powered and heated by a small amount of heating power source.

[0045] Effects of the Invention

[0046] The embodiments of the present application can provide a battery module, a battery, an electrical device, an energy storage device, and a battery module manufacturing method that have good adaptability to the use environment and little impact on assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0048] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0049] Figure 2 A schematic diagram of the structure of an energy storage device provided in some embodiments of the present application;

[0050] Figure 3 A three-dimensional schematic diagram of a battery provided for some embodiments of the present application;

[0051] Figure 4 A schematic diagram of the structure of a battery module provided for some embodiments of the present application;

[0052] Figure 5 A three-dimensional exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0053] Figure 6 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0054] Figure 7 Some embodiments of the present application provide Figure 6 A schematic cross-sectional view of AA;

[0055] Figure 8 Some embodiments of the present application provide Figure 7 A partial enlarged schematic diagram of the middle B area;

[0056] Fig. 9 Some embodiments of the present application provide Figure 6 A local enlarged schematic diagram of the C region;

[0057] Fig.10 An exploded schematic diagram of a battery module provided for some embodiments of the present application;

[0058] Fig.11 Some embodiments of the present application provide Fig.10 A partial enlarged schematic diagram of the D area in the middle;

[0059] Fig.12 An exploded schematic diagram of a battery module provided for some embodiments of the present application;

[0060] Fig.13 Some embodiments of the present application provide Fig.12 A partial enlarged schematic diagram of the middle E area;

[0061] Fig.14 An exploded schematic diagram of a power connector and a power-side connector provided in some embodiments of the present application;

[0062] Fig.15 A schematic diagram of an exploded view of a power connector and a power-side connector provided in some embodiments of the present application from another angle;

[0063] Fig.16 A flow chart of a method for manufacturing a battery cell is provided for some embodiments of the present application.

[0064] Description of Reference Numerals

[0065] 1000 vehicle; 2000 energy storage device; 100 battery; 200 controller; 300 motor; 400 electrical compartment; 10 battery cell; 20 battery module; 1 shell; 11 outer surface; 111 bottom surface; 112 top surface; 113 side surface; 2 heating assembly; 21 first insulating layer; 22 second insulating layer; 23 heating unit; 231 positive terminal; 232 negative terminal; 233 heating resistor; 31 positive wire for heating; 32 negative wire for heating; 4 pole; 51 power connector; 511 socket; 512 positive conductive terminal; 513 positive conductive terminal; 52 power side connector; 7 contact electrode; 71 positive contact electrode; 72 negative contact electrode; 8 contact terminal; 81 positive contact terminal; 82 negative contact terminal; 83 metal body; 84 connecting terminal; 831 pit; 9 electrode assembly; X first direction; Y second direction; Z third direction. DETAILED DESCRIPTION

[0066] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions.

[0068] In the description of the embodiments of the present application, the technical terms "first", "second", "third", "fourth", "fifth", "sixth", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0069] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0070] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0071] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "thickness", "up", "down", "left", "right", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present application.

[0072] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "connection" and "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0073] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0074] Below, this application is described in detail.

[0075] New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in the field of energy storage. In new energy vehicles equipped with batteries, batteries can be used to provide power in whole or in part. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side. In these application scenarios, the performance of batteries is affected by the operating temperature.

[0076] Especially in some low temperature usage environments, there are adverse situations such as the battery cannot start or starts slowly, and the battery energy is limited.

[0077] Therefore, in order to improve the performance of the battery, it is sometimes necessary to heat the battery cells in the battery. How to heat the battery cells to improve the adaptability to the use environment is one of the research topics in the industry.

[0078] In the related art, there is a solution of installing a heating membrane on the side or bottom of a battery cell or a heat exchange plate with a heat exchange medium circulating inside. However, such a solution has the disadvantage of greatly increasing the outline size of the battery cell or even the battery module, inhibiting the volume utilization of the battery and reducing the energy density of the battery.

[0079] Research has found that providing a heating resistor such as a micron-sized resistance wire on the outer surface of a battery cell can suppress the impact on the contour and volume of the battery cell when heating the battery cell, thereby suppressing the impact on the assembly size of the battery module.

[0080] Based on such a design concept, the inventor of the present application designed a battery cell, which includes: a shell body, which accommodates an electrode assembly inside, and the shell body includes multiple outer surfaces; a heating assembly, which is formed on at least one outer surface, and the heating assembly includes a first insulating layer, a heating unit, and a second insulating layer that are stacked, and the heating unit is located between the first insulating layer and the second insulating layer, and the heating unit is connected to the power supply connection structure; wherein the heating unit includes at least one heating resistor, and the thickness of the heating unit in a direction perpendicular to the outer surface where the heating unit is located is between 1 micron and 150 microns.

[0081] Since the surface of the battery cell shell has a heating component, the battery cell can be heated, and even if the battery cell works in a low temperature environment, it can still have good working performance, so it has good environmental adaptability. Moreover, since the heating unit heats the battery cell by heating the heating resistor, it has the advantages of fast heating and small space occupied by the heating unit. The micron-level resistor has very little effect on the outline of the battery cell, and can not increase the assembly size of the battery module or battery module, which is conducive to keeping the original outline size of the battery module or battery module, and is conducive to suppressing the reduction of the volume utilization rate of the battery.

[0082] The battery cells provided in the embodiments of the present application may also be grouped together to be used as batteries or battery modules. The battery modules may also be grouped together to be used as batteries, and the batteries include battery packs. The batteries may also be used in, but not limited to, energy storage power supply systems, vehicles, ships, aircraft, and other electrical devices.

[0083] An embodiment of the present application provides an energy storage device including the above-mentioned battery cell, the above-mentioned battery module or the above-mentioned battery for storing electrical energy and capable of providing electrical energy. The energy storage device may include but is not limited to an energy storage container, an energy storage cabinet, etc.

[0084] The embodiment of the present application provides an electric device including the above-mentioned battery monomer, the above-mentioned battery module or the above-mentioned battery for providing electric energy, and the electric device may include but is not limited to mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships and spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc.

[0085] In the following embodiments, for the convenience of description, the electric device of some embodiments of the present application is described by taking a vehicle 1000 as an example. The following is a description with reference to the accompanying drawings.

[0086] Figure 1 The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.

[0087] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0088] Figure 2 The schematic diagram of the structure of the energy storage device 2000 provided in some embodiments of the present application. The energy storage device 2000 may be an energy storage container or an energy storage cabinet. Figure 2 As shown, the energy storage device 2000 may include a battery 100 arranged in a battery compartment and an electrical compartment 400. For example, an electrical control box may be arranged in the electrical compartment 400 to control the charging and discharging of the battery 100, monitor the working status of the battery 100, etc., for example, to monitor parameters such as ambient temperature and humidity.

[0089] Figure 3 Schematic diagram of a battery 100 provided in some embodiments of the present application. Figure 3 As shown, the battery 100 includes a case having an accommodation space formed therein and at least one battery cell 10 accommodated in the case.

[0090] In the battery 100, the battery cell 10 may be one or more battery cells 10 to provide a single physical module with higher voltage and capacity. Multiple battery cells 10 may be connected in series, in parallel or in a mixed connection. A mixed connection means that multiple battery cells 10 are connected in series and in parallel. Multiple battery cells 10 may be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the multiple battery cells 10 is placed in the accommodation space formed by the bottom plate and the cover body; of course, the battery 100 may also be a battery module 20 in the form of multiple battery cells 10 connected in series, in parallel or in a mixed connection, and then the multiple battery modules 20 are connected in series, in parallel or in a mixed connection to form a whole, and are accommodated in the accommodation space formed by the bottom plate and the cover body. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for realizing electrical connection between multiple battery cells 10.

[0091] In the embodiment of the present application, the battery cell 10 can be a secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., which is not limited in the embodiment of the present application. The battery cell 10 can be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiment of the present application. The battery cell 10 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiment of the present application.

[0092] Figure 4 The battery module 20 provided in some embodiments of the present application is a three-dimensional schematic diagram. The battery module 20 may be composed of a plurality of battery cells 10 connected in series, in parallel, or in mixed connection. Figure 4 Only two battery cells 10 are exemplarily shown in the figure, but it is obvious that the number of the battery cells 10 may be more than two.

[0093] Figure 5 Schematic diagram of a three-dimensional exploded view of a battery cell 10 provided in some embodiments of the present application. Figure 5As shown, the battery cell 10 includes a shell 1 and at least one electrode assembly 9, and the shell 1 is used to encapsulate the electrode assembly 9 and components such as electrolyte. The electrode assembly 9 is provided with a pole ear (not shown), and the pole ear can lead the current from the electrode assembly 9. The pole ear includes a positive pole ear and a negative pole ear. The shell 1 can be a steel shell, an aluminum shell or a composite metal shell (such as a copper-aluminum composite shell), etc.

[0094] In some embodiments, Figure 5 As shown, at least one pole 4 is provided on the housing 1, and the pole 4 is electrically connected to the pole lug. The pole 4 can be directly connected to the pole lug, or indirectly connected to the pole lug through a transition component. The pole 4 can be provided on the end cover, or on the housing 1.

[0095] The shell 1 may include a main shell and an end cover, and the main shell may be in various shapes, such as a cylinder, a cuboid, etc. The shape of the main shell may be determined according to the specific shape of the electrode assembly. For example, if the electrode assembly is a cylindrical structure, a cylindrical shell 1 may be selected; if the electrode assembly 9 is a cuboid structure, a cuboid shell 1 may be selected. Of course, the end cover may also be in various structures, such as a plate-like structure, a hollow structure with one end open, etc. For example, in the figure, the main shell is a cuboid structure, and the end cover is a plate-like structure, and the end cover covers the opening at the top of the main shell.

[0096] In some embodiments, the pole 4 includes a positive pole and a negative pole, and the battery cell 10 may further include a pressure relief structure, and the positive pole, the negative pole and the pressure relief structure are all mounted on the end cap. The positive pole and the negative pole are both used to be electrically connected to the electrode assembly. The pressure relief structure is used to release the pressure inside the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a predetermined value.

[0097] Exemplarily, the pressure relief structure is located between the positive pole and the negative pole, and the pressure relief structure may be a component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve. The cathode electrode terminal and the anode electrode terminal may be installed on the same end cap or on different end caps; the pressure relief structure may be installed on one end cap or on both end caps.

[0098] Below, refer to Figures 4 to 16 Some embodiments of the present application are described in detail.

[0099] Figure 4 A schematic diagram of the structure of a battery module 20 provided in some embodiments of the present application; Figure 5 A three-dimensional exploded schematic diagram of a battery cell 10 provided in some embodiments of the present application; Figure 6 A schematic structural diagram of a battery cell 10 with a heating assembly 2 provided in some embodiments of the present application; Figure 7 Some embodiments of the present application provide Figure 6 A schematic cross-sectional view of the AA section of the battery cell 10; Figure 8 Some embodiments of the present application provide Figure 7 A partial enlarged schematic diagram of the middle B area; Fig. 9 Some embodiments of the present application provide Figure 6 An enlarged schematic diagram of the positive terminal 231 of the contact electrode 7 in the middle C region being connected to the positive heating wire 31 and the negative terminal 232 being connected to the negative heating wire 32; Fig.10 An exploded schematic diagram of a battery module 20 provided for some embodiments of the present application; Fig.11 Some embodiments of the present application provide Fig.10 A partial enlarged schematic diagram of the contact electrode 7 in the middle D region; Fig.12 Some embodiments of the present application provide Fig.10 A schematic diagram of an exploded view of the battery module 20 from another angle; Fig.13 Some embodiments of the present application provide Fig.12 A partial enlarged schematic diagram of the contact terminal 8 in the middle E area; Fig.14 An exploded schematic diagram of a power connector 51 and a power-side connector provided in some embodiments of the present application; Fig.15 A schematic diagram of an exploded view of the power connector 51 and the power-side connector provided in some embodiments of the present application from another angle; Fig.16 A flow chart of a method for manufacturing a battery cell 10 provided in some embodiments of the present application.

[0100] Some embodiments of the present application provide a battery cell 10. The battery cell 10 includes: a shell 1, which contains an electrode assembly 9, and the shell 1 includes multiple outer surfaces 11; a heating assembly 2, which is formed on at least one outer surface 11, and the heating assembly 2 includes a first insulating layer 21, a heating unit 23, and a second insulating layer 22 that are stacked, and the heating unit 23 is located between the first insulating layer 21 and the second insulating layer 22, and the heating unit 23 is connected to the power supply connection structure; the heating unit 23 includes at least one heating resistor 233. The thickness of the heating unit 23 in the direction perpendicular to the outer surface 11 where the heating unit 23 is located is between 1 micron and 150 microns.

[0101] like Figures 4 to 7 As shown, the housing 1 includes a plurality of outer surfaces 11 , and the heating assembly 2 is located on at least one of the outer surfaces 11 .

[0102] Optionally, the shell 1 may be in a cylindrical, rectangular, polygonal or other shapes, and the polygonal is, for example, a hexagonal, etc., which is not limited in this embodiment. The following embodiments are described with the shell 1 being a rectangular shell.

[0103] Optionally, the heating component 2 may be located on one, two, three, four, etc. outer surfaces 11, which is not limited in this embodiment.

[0104] Optionally, the heating component 2 may occupy the entire surface of the outer surface 11 on which it is located, or the heating component 2 may occupy a portion of the outer surface 11 on which it is located, which is not limited in this embodiment.

[0105] like Figure 7 , Figure 8 and Fig. 9 As shown, the heating assembly 2 includes a first insulating layer 21, a heating unit 23, and a second insulating layer 22 which are stacked, and the heating unit 23 is located between the first insulating layer 21 and the second insulating layer 22. The heating assembly 2 is insulated from the housing 1 of the battery cell 10 in which it is located by the first insulating layer 21. The heating assembly 2 is insulated from the components around the battery cell 10 by the second insulating layer 22, for example, when a plurality of battery cells 10 are arranged, the heating assembly 2 is insulated from the adjacent battery cells 10.

[0106] The heating unit 23 includes at least one heating resistor 233. The heating resistor 233 may be one or more, and the plurality of heating resistors 233 are distributed at a certain interval within the surface of the first insulating layer 21. From the perspective of being able to efficiently heat the battery cell 10, the heating resistor 233 is distributed at least in the area corresponding to the position of the electrode assembly 9.

[0107] In some embodiments, some or all of these heating resistors 233 are connected in series; in other embodiments, some or all of these heating resistors 233 are connected in parallel; in some embodiments, these heating resistors 233 can also be mixed-connected, and these heating resistors 233 can be directly or indirectly connected to a heating power supply and powered by the heating power supply.

[0108] In some embodiments, the heating unit 23 is connected to a power supply connection structure, and the heating resistors 233 are connected to a heating power source through the power supply connection structure. Here, the heating power source may be a power source from outside the battery module 20 or the battery pack, or may be a power source arranged in the battery module 20 or the battery pack. In some embodiments, these power sources may be a secondary battery or a primary battery provided separately.

[0109] The heating unit 23 is formed on the first insulating layer 21. Optionally, the first insulating layer 21 is arranged on the outer surface 11, the heating unit 23 is printed on the first insulating layer 21, and the heating unit 23 is integrally encapsulated by the second insulating layer 22. The heating unit 23 is formed on the first insulating layer 21, not limited to the printing method, and other suitable methods, such as bonding, may also be used.

[0110] Optionally, the first insulating layer 21 may be located between the outer surface 11 and the heating unit 23, or the second insulating layer 22 may be located between the outer surface 11 and the heating unit 23, which is not limited in this embodiment. Figures 6 to 8 In the illustrated embodiment, an example is taken in which the first insulating layer 21 is located between the outer surface 11 and the heating unit 23 for description.

[0111] The thickness L of the heating unit 23 in a direction perpendicular to the outer surface 11 where the heating unit 23 is located is in a range of 1 μm to 150 μm.

[0112] The thickness L of the heating unit 23 can be any micron level in the range of 1 micron to 150 microns, for example, 1 micron, 2 microns, 10 microns, 40 microns, 70 microns, 80 microns, 100 microns, 130 microns, 150 microns. The thickness of the heating component 2 as a whole can be in the range of 10 microns to 200 microns. In some embodiments, the thickness L is in the range of 1 micron to 30 microns, and the thickness of the heating component 2 as a whole can be in the range of 10 microns to 40 microns.

[0113] In the embodiment of the present application, since the surface of the housing 1 of the battery cell 10 has a heating assembly 2, the battery cell 10 can be heated, and even if the battery cell 10 works in a relatively low temperature environment, it can still have good working performance, and therefore has good environmental adaptability. Moreover, since the heating unit 23 heats the battery cell 10 by generating heat through the heating resistor 233, it has the advantages of fast heating and small space occupied by the heating unit 23. The micron-level printed resistor has very little effect on the contour of the battery cell 10, and can not increase the assembly size of the battery module 20 or the battery module, which is conducive to keeping the original contour size of the battery module 20 or the battery module, and is conducive to suppressing the reduction of the volume utilization rate of the battery 100.

[0114] In some embodiments of the present application, Figure 6 As shown, there are multiple heating resistors 233 , and in the same outer surface 11 , the multiple heating resistors 233 are arranged in an array.

[0115] The heating resistors 233 may be arranged in an array on the outer surface 11, specifically, on the first insulating layer 21. The heating resistors 233 may be arranged in an array, for example, in an array in an m-by-n manner, where m and n are natural numbers greater than 1. Of course, the array is not limited to an m-by-n matrix array, and may also be other arrays, such as a ring array, a linear array, etc.

[0116] In different outer surfaces 11 , the arrays in which the heating resistors 233 are arranged may be the same or different.

[0117] This helps to heat multiple locations on the outer surface 11 of the battery cell 10, and the heating is fast and uniform. Moreover, even if the number of heating resistors 233 is increased, the outer contour size of the battery cell 10 will not change significantly.

[0118] In some embodiments, the heating unit 23 also includes a heating positive wire 31 and a heating negative wire 32 for being electrically connected to a heating power supply, and each heating resistor 233 has a positive terminal 231 and a negative terminal 232, the positive terminal 231 is electrically connected to the heating positive wire 31, and the negative terminal 232 is electrically connected to the heating negative wire 32.

[0119] like Figure 6 and Fig. 9 As shown, the positive terminal 231 and the negative terminal 232 are respectively the current input terminal and the current output terminal of the heating resistor 233. The positive terminal 231 and the negative terminal 232 of each heating resistor 233 may be directly connected to the positive heating line 31 and the negative heating line 32; or the positive terminals 231 and the negative terminals 232 of multiple heating resistors 233 may be connected to each other (in series or in parallel), and the positive terminal 231 of the most upstream heating resistor 233 and the negative terminal 232 of the most downstream heating resistor 233 in terms of the current inflow direction are connected to the positive heating line 31 and the negative heating line 32. In this case, there is a situation where the positive terminals 231 and the negative terminals 232 of multiple heating resistors 233 are indirectly electrically connected to the positive heating line 31 and the negative heating line 32.

[0120] The heating positive electrode wire 31 transmits electric energy to the heating unit 23 by being electrically connected to the positive terminal 231 . The heating unit 23 converts the transmitted electric energy into heat energy, and the converted heat energy is used to heat the battery cell 10 .

[0121] The positive heating wire 31 and the negative heating wire 32 may be arranged at any position in the heating assembly 2. In some embodiments, the positive heating wire 31 and the negative heating wire 32 are arranged at positions near the edge of the first insulating layer 21.

[0122] In a specific embodiment, Figure 6 As shown, a portion of the heating positive wire 31 and the heating negative wire 32 are arranged in parallel near one end of the outer surface 11, and are parallel to the edge of the outer surface 11 closest to the heating positive wire 31 and the heating negative wire 32. In addition, there are also some electrical connection wires between the heating resistors 233, and these electrical connection wires can also be regarded as a portion of the heating positive wire 31 or the heating negative wire 32.

[0123] The plurality of heating resistors 233 can be connected in series and / or in parallel through the heating positive wire 31 and the heating negative wire 32, so that they can be easily electrically connected to the heating power supply, which helps to simplify the circuit structure and improve the freedom of positional arrangement of the heating power supply.

[0124] In some embodiments of the present application, the heating unit 23 is formed by printing.

[0125] The printing method can, on the one hand, form a heating unit 23, which can heat the battery cell 10 in a low temperature environment, thereby reducing the impact of the operating temperature on the battery cell 10 and improving the performance of the battery cell 10; on the other hand, compared with the conventional method of installing a heating membrane or a heat exchange plate on the side 113 or the bottom 111 of the battery cell 10, the printing heating unit 23 has little impact on the outer contour dimensions of the battery cell 10, does not increase the assembly dimensions of the battery module 20 when multiple battery cells 10 are assembled into a battery module 20 or a battery module, and can keep the original contour dimensions of the battery module 20 or the battery module, thereby improving the volume utilization rate in the battery 100, improving the energy density of the battery 100, and saving the occupied space of the battery 100.

[0126] Moreover, by printing to form the heating unit 23, it is possible to more easily form a heating resistor 233 with a complex shape, which helps to improve the heating effect and also helps to make the heating resistor 233 more evenly distributed on the surface to be heated.

[0127] As the printing device, for example, a commercially available metal stereoscopic printing (also called 3D printing) device may be used. Furthermore, a commercially available micron-level metal stereoscopic printing device may be used.

[0128] Since the printing method of forming the heating unit 23 helps to make the metal wire of the heating resistor 233 thinner, it helps to reduce the size of the space occupied by the heating unit 23. This can help not increase the assembly size of the battery module 20 or the battery module, and helps to keep the battery module 20 or the battery module with the original outline size, which helps to reduce the reduction in the volume utilization of the battery 100.

[0129] In some embodiments, the plurality of outer surfaces 11 include a first outer surface, which is a surface with the largest area among the plurality of outer surfaces 11 , and the heating component 2 is at least formed on the first outer surface.

[0130] exist Figure 5 and Figure 6In the illustrated embodiment, the surface with the largest area among the plurality of outer surfaces 11 is the large surface among the side surfaces 113. The heating component 2 is formed at least on the large surface among the side surfaces 113. In addition, the heating component 2 is also formed on the surface other than the large surface among the side surfaces 113. Of course, the heating component 2 may also be formed on the bottom surface 111 and / or the top surface 112. In the case where the heating component 2 is formed on the outer surface with the pole, it may be formed in the area of ​​the outer surface avoiding the pole.

[0131] By arranging the heating assembly 2 at least on the large surface of the battery cell 10, it is helpful to improve the heating speed and heating uniformity of the battery cell 10. Forming the heating assembly 2 on more outer surfaces 11 is conducive to further improving the heating speed and heating uniformity of the battery cell 10.

[0132] In some embodiments, the plurality of outer surfaces 11 include first outer surfaces opposite to each other along a first direction X, second outer surfaces opposite to each other along a second direction Y, and third outer surfaces opposite to each other along a third direction Z, the first outer surface, the second outer surface, and the third outer surface are connected to each other, wherein the first outer surface is the surface with the largest area among the plurality of outer surfaces 11, a pole 4 of a battery cell is formed on one of the two third outer surfaces, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other, the heating component 2 is formed on the first outer surface and the second outer surface, or the heating component is formed on the first outer surface, the second outer surface, and the other of the two third outer surfaces.

[0133] In some embodiments, Figure 5 and Figure 6 As shown, the multiple outer surfaces 11 of the battery cell 10 include a bottom surface 111, a top surface 112 and at least one side surface 113, the pole 4 is located on the top surface 112, and the heating component 2 is located on the side surface 113 or on the side surface 113 and the bottom surface 111. Of course, the heating component 2 can also be located in the top surface 112, and can be set at a position away from the pole 4.

[0134] exist Figure 5 and Figure 6 In the illustrated embodiment, the side surface 113 becomes the above-mentioned first outer surface and the second outer surface; the bottom surface 111 and the top surface 112 become the above-mentioned third outer surface.

[0135] like Figure 5 , Figure 6 and Figure 7 As shown, there is at least one pole 4 on the top surface 112, and the heating component 2 can be located on the side surface 113, or on the side surface 113 and the bottom surface 111. The top surface 112 and the bottom surface 111 are two opposite surfaces, the side surface 113 is perpendicular to the bottom surface 111, and the side surface 113 includes two opposite large surfaces with the largest areas, and the side surface 113 also includes two small surfaces perpendicular to the large surfaces and with an area smaller than the large surface.

[0136] Optionally, the pole 4 may be one or two, for example, the pole 4 may include a positive pole and a negative pole, which is not limited in this embodiment.

[0137] Optionally, the heating component 2 can be located on one large surface, two large surfaces, two large surfaces and two small surfaces, all side surfaces 113 and the bottom surface 111, all outer surfaces 11, etc. This embodiment does not limit this and can be set according to actual conditions.

[0138] The arrangement of the heating components 2 on multiple outer surfaces 11 can increase the heating area of ​​the heating components 2, improve the heating efficiency of the battery cells 10 by the heating components 2, reduce the impact of the operating temperature on the battery cells 10, improve the discharge efficiency and service life of the battery cells 10, and enhance the performance of the battery cells 10. In addition, the heating components 2 can be arranged on the top surface 112, the side surface 113, or the bottom surface 111 of the battery cells 10 according to the situation, so as to help improve the heating speed and heating uniformity.

[0139] In some embodiments, Fig. 9 As shown, the first insulating layer 21 includes an aluminum oxide ceramic coating, an aluminum oxide ceramic and titanium oxide composite powder coating, a polymer ceramic polymer coating or a nano ceramic coating; and / or, the material of the heating unit 23 includes copper, silver, gold or platinum; and / or, the second insulating layer 22 includes a photosensitive packaging glue layer.

[0140] In some embodiments, the first insulating layer 21 may be an aluminum oxide ceramic coating, an aluminum oxide ceramic and titanium oxide composite powder coating, a high molecular ceramic polymer coating, or a nano ceramic coating.

[0141] Alumina ceramics are commonly used high-performance ceramic insulating coating materials. The insulation strength of the coating sprayed with alumina ceramic powder reaches 1069V / 0.1mm. Alumina ceramics have high resistivity and large dielectric constant. The first insulating layer uses alumina ceramics to improve the resistivity of the first insulating layer.

[0142] The alumina ceramic and titanium oxide composite powder coating is prepared by mixing alumina and 3% titanium oxide composite powder and spraying the mixed powder onto the treated outer surface 11 by plasma process, thereby forming a protective coating having the characteristics of being dense, tough and highly electrically insulating.

[0143] Commercially available high molecular ceramic polymer coatings or nano ceramic coatings may also be used.

[0144] When the first insulating layer 21 is made of the above materials, the insulating property of the first insulating layer 21 can be improved, and the heating unit 23 formed by printing can be stably maintained, thereby improving the performance of the battery cell 10 .

[0145] In some embodiments, the material of the heating unit 23 includes copper, silver, gold or platinum. These metal materials have good electrical conductivity and can generate heat when powered. Of course, other suitable conductive and heat-generating materials can also be used to print and form the heating unit 23.

[0146] In some embodiments, Fig. 9 As shown, the second insulating layer 22 is a photosensitive packaging glue layer.

[0147] As a specific example, the photosensitive encapsulation adhesive may be, for example, photosensitive polyimide encapsulation adhesive.

[0148] Photosensitive encapsulation adhesive can realize the etching and printing of fine patterns, making the structure of the heating component 2 more refined; in addition, the photosensitive encapsulation adhesive can be cured by light irradiation such as ultraviolet rays, and the curing speed is fast, which improves the production efficiency of the heating component 2, and thus improves the production efficiency of the battery cell 10; in addition, the photosensitive encapsulation adhesive has good adhesion properties and can firmly bond the encapsulated heating unit 23, thereby improving the stability of the heating component 2.

[0149] Therefore, the use of photosensitive packaging glue for the second insulating layer 22 can improve the precision, manufacturing efficiency and stability of the heating component 2, reduce the production difficulty of the battery cell 10, and speed up the production rate of the battery cell 10.

[0150] This can effectively insulate the heating assembly 2 from the battery cell 10 and surrounding components, and is conducive to forming micron-level printed resistors through printing.

[0151] In some embodiments, the power supply connection structure includes an interconnection assembly for electrically connecting the heating unit 23 to the heating unit 23 or the heating power source of the adjacent battery cell 10 , and the interconnection assembly includes a contact electrode 7 and a contact terminal 8 .

[0152] The contact electrode 7 includes a positive contact electrode 71 and a negative contact electrode 72, and the contact terminal 8 includes a positive contact terminal 81 and a negative contact terminal 82. The positive contact electrode 71 is electrically connected to the positive heating wire 31 on the battery cell 10 where the positive contact electrode 71 is located, and the negative contact electrode 72 is electrically connected to the negative heating wire 32 on the battery cell 10 where the negative contact electrode 72 is located. The positive contact terminal 81 is electrically connected to the positive heating wire 31 on the battery cell 10 where the positive contact terminal 81 is located, and the negative contact terminal 82 is electrically connected to the negative heating wire 32 on the battery cell 10 where the negative contact terminal 82 is located. The positive contact electrode 71 is electrically connected to the positive contact terminal 81, and the negative contact electrode 72 is connected to the negative contact terminal 82.

[0153] exist Fig.10 and Fig.11In the illustrated embodiment, the contact electrode 7 is disposed on one of the plurality of outer surfaces 11 .

[0154] In some embodiments, multiple battery cells 10 are arranged to form a battery module 20 with their large faces (e.g., large faces in the side surface 113) facing each other, and the contact electrode 7 can be disposed on the large face. In other embodiments, multiple battery cells 10 are arranged to form a battery module 20 with their small faces in the side surface (e.g., small faces in the side surface 113) facing each other, and the contact electrode 7 can be disposed on the small face.

[0155] Accordingly, in some embodiments, the contact terminal 8 and the contact electrode 7 may be disposed in the same outer surface 11, so that every two battery cells 10 may be electrically connected through the contact between the contact terminal 8 and the contact electrode 7. Figures 10 to 13 As shown, a plurality of battery cells 10 are arranged into a battery module 20, and in one battery cell 10, the contact terminal 8 and the contact electrode 7 are respectively arranged in two outer surfaces 11 opposite to each other along the arrangement direction. For example, a plurality of battery cells 10 are arranged into a battery module 20 in a manner that their large surfaces (such as large surfaces in the side surface 113) are opposite to each other, and the contact terminal 8 and the contact electrode 7 are respectively arranged in two large surfaces opposite to each other along the arrangement direction.

[0156] The contact electrode 7 may be an electric contact electrode, and may be processed by printing wear-resistant silver paste.

[0157] The contact terminal 8 may be a structure protruding from the outer surface 11 , and may be in a columnar, needle-like, sheet-like, or other suitable shapes.

[0158] In this way, multiple battery cells 10 can be easily interconnected, and even if a heating power supply is not provided for each battery cell 10, the heating assembly 2 of each battery cell 10 can be powered, which is beneficial for reducing the space occupied by the heating power supply and improving the volume utilization of the battery 100.

[0159] In some embodiments, the contact terminal 8 includes a conductive metal elastic sheet, and the metal elastic sheet is configured to generate an elastic force when pressed.

[0160] In some embodiments, Fig.12 and Fig.13As shown, the contact terminal 8 includes a metal body 83 that bulges in a direction away from the side 113 and a connection terminal 84 connected to the edge of the metal body 83. The metal body 83 has a certain elastic deformation ability, and when pressed toward the side 113, a certain elastic force is generated. The metal body 83 of the contact terminal 8 is electrically connected to the heating unit 23. The number of the contact terminals 8 is, for example, two, which are electrically connected to the positive heating line 31 and the negative heating line 32, respectively, and further electrically connected to the heating unit 23.

[0161] In addition, for the surface of the contact terminal 8 facing away from the side surface 113, the portion not connected to the contact electrode 7 or the heating power supply can be insulated. Of course, this is not necessary, and when the portion in contact with the contact terminal 8 is insulated, the contact terminal 8 can be completely exposed.

[0162] In some embodiments, the metal body 83 may also have a pit 831. When the contact electrode 7 on the adjacent battery cell 10 contacts the metal body 83 of the contact terminal 8, it can be partially or completely accommodated in the pit 831, which helps to improve the stability of the contact connection and also helps to increase the electrical connection area.

[0163] Some embodiments of the present application further provide a battery module 20. The battery module 20 includes at least one of the battery cells 10 described above, and also includes a power connector 51, which is used to electrically connect to a power source for heating and is configured to electrically connect to a power supply connection structure in a heating assembly 2 of at least one of the battery cells 10.

[0164] In some embodiments, the power connector 51 can be electrically connected to the positive heating wire 31 and the negative heating wire 32 in the heating unit 23 through the contact electrode 7 or the contact terminal 8. As a specific example, the pins of the power connector 51 can be welded to the contact electrode 7 or the contact terminal 8. Of course, the pins of the power connector 51 can also be directly welded to somewhere in the positive heating wire 31 and the negative heating wire 32.

[0165] like Figure 4 , Figure 6 , Fig.10 and Fig.12 As shown, the battery module 20 includes at least one battery cell 10 as described above. The heating components 2 located on the outer surface 11 of the battery cell 10 can be electrically connected to each other or to the power connector 51. The heating components 2 are insulated from the shell 1 of the battery cell 10.

[0166] Optionally, the battery module 20 may include one, two, three or four battery cells 10, which is not limited in the present application.

[0167] The power connector 51 is electrically connected to the heating positive electrode line 31 and the heating negative electrode line 32 on the battery cell 10 where the power connector 51 is located.

[0168] like Fig.12 As shown, the power connector 51 provides electric energy to the heating unit 23 in the heating assembly 2 by being electrically connected to the heating positive electrode line 31 and the heating negative electrode line 32 , so that each heating resistor 233 generates heat.

[0169] In some embodiments, the number of battery cells is more than two; the power connector 51 is provided on one or part of the battery cells 10, and is configured to be connected to the power supply connection structure in the heating assembly 2 of the battery cell 10 provided with the power connector 51; the heating unit 23 of the battery cell 10 provided with the power connector 51 is at least electrically connected to the heating unit 23 of the adjacent battery cell 10 not provided with the power connector 51.

[0170] Optionally, when the battery module 20 includes a plurality of arranged battery cells 10, the power connector 51 may be provided on one battery cell 10 or on several battery cells 10. That is, all battery cells 10 in the battery module 20 may share one power connector 51; or a portion (e.g., 2, 4, 6, 8) of the battery cells 10 in the battery module 20 may share one power connector 51. The power connector 51 may be located on the middle battery cell 10 in the arrangement direction, or on the battery cell 10 at the end in the arrangement direction. The power connector 51 may be located on the bottom surface 111, the top surface 112, or the side surface 113 of the battery cell 10. The power connector 51 may be located on the side surface 113 of the battery cell 10 at the end away from other battery cells 10.

[0171] In a specific embodiment, when the power connector 51 is located on the side of the battery module 20, for example, it can be located on the surface of the battery cell 10 at the end of the battery module 20 (eg, Fig.12 As shown on the right, the space between the battery cells 10 may not be occupied, so that the battery cells 10 can be closely arranged, thereby reducing the assembly size of the battery module 20.

[0172] By equipping the battery module with a power connector 51 , the heating assembly 2 of each battery cell 10 in the entire battery module 20 can be powered for heating, and the connection with the heating power source is convenient.

[0173] In this way, a small number of power connectors 51 can be used to power and heat the heating components 2 of each battery cell 10 in the entire battery module 20, which helps to reduce the number of parts, reduce operation time, and help reduce the space occupied by the power connectors 51 and the heating power supply.

[0174] In some embodiments, the power connector 51 includes a socket 511 having a positive conductive terminal 512 and a negative conductive terminal 513 ; or, the power connector 51 includes a plug having a positive conductive terminal 512 and a negative conductive terminal 513 .

[0175] In some embodiments, Fig.14 and Fig.15 As shown, the power connector 51 includes a socket 511, and the socket 511 is provided with a positive conductive terminal 512 and a negative conductive terminal 513. The positive conductive terminal 512 and the negative conductive terminal 513 are located in the shell of the socket 511, and one end of the positive conductive terminal 512 passes through the shell of the socket 511 and is electrically connected to the positive heating wire 31; one end of the negative conductive terminal 513 passes through the shell of the socket 511 and is electrically connected to the negative heating wire 32.

[0176] In a specific embodiment, Fig.12 As shown, the positive conductive terminal 512 is electrically welded to the positive heating wire 31 , and the negative conductive terminal 513 is electrically welded to the negative heating wire 32 , so that the circuit connection is more stable, the probability of power failure of the heating component 2 is reduced, and the performance of the battery cell 10 is improved.

[0177] The shape of the positive conductive terminal 512 and the negative conductive terminal 513 is not limited as long as they can achieve electrical connection. When the positive conductive terminal 512 and the negative conductive terminal 513 are configured as protruding shapes and are electrically connected by being inserted into the power side connector 52, they can be used as plugs; when they are configured as recessed shapes and receive the insertion of the power side connector 52, they can be used as sockets.

[0178] In a specific embodiment, Fig.14 and Fig.15 As shown, the socket 511 is a rectangular parallelepiped, and the socket 511 has a socket wall, the socket wall forms a first accommodation space, and the socket wall perpendicular to the outer surface 11 where the power connector 51 is located has a first opening, for example, the first opening can face Fig.14 The upper opening in the middle occupies the entire surface of the socket wall where it is located. The positive conductive terminal 512 and the negative conductive terminal 513 are respectively in the shape of long strips and extend perpendicularly to the first opening direction.

[0179] The heating power supply can be connected to the power supply side connector 52, and the power supply side connector 52 can be electrically connected to the heating power supply body (not shown) through a cable, etc. When the power supply side connector 52 is connected to the power supply connector 51, the heating unit 23 in the heating assembly 2 can be powered for heating.

[0180] In addition, the heating power supply can also be connected to a controller, such as a control switch, to control the on and off of the power supply, the size of the current, etc.

[0181] The embodiment of the present application further provides a battery 100, comprising a housing and at least one battery module 20 as described above housed in the housing.

[0182] Since the battery 100 adopts the battery cell 10 or the battery module 20 as described above, it can not only reduce the influence of the working temperature on the battery module 20 by heating the battery module 20 in a low temperature environment, but also improve the adaptability of the battery 100 to the environment.

[0183] Some embodiments of the present application further provide an electrical device, comprising the battery module 20 as described above or the battery 100 as described above, wherein the battery module 20 or the battery 100 is used to provide electrical energy to the electrical device.

[0184] This can improve the adaptability of the electrical device to the environment.

[0185] like Figure 2 As shown, some embodiments of the present application further provide an energy storage device 2000, comprising the battery module 20 or the battery 100 as described above, wherein the battery module 20 or the battery 100 is capable of storing electrical energy and providing electrical energy.

[0186] This can improve the adaptability of the energy storage device 2000 to the environment.

[0187] Combine the following Fig.16 The manufacturing method of the battery cell 10 provided in the embodiment of the present application is described.

[0188] Fig.16 A schematic flow chart of a method for manufacturing a battery cell 10 provided in some embodiments of the present application.

[0189] like Fig.16 As shown, the method for manufacturing the battery cell 10 includes the following steps.

[0190] S100: A step of forming a first insulating layer on at least one outer surface of a housing.

[0191] In some embodiments, a first insulating layer 21 is formed on at least one outer surface 11 of the housing 1 .

[0192] S200: A step of printing a heating unit on the first insulating layer, wherein a thickness of the heating unit in a direction perpendicular to an outer surface where the heating unit is located is between 1 micrometer and 150 micrometers.

[0193] In some embodiments, the heating unit 23 is printed on the first insulating layer 21. The thickness of the heating unit 23 in a direction perpendicular to the outer surface 11 where the heating unit 23 is located is between 1 micrometer and 150 micrometers.

[0194] S300: a step of forming a second insulating layer on the first insulating layer having the heating unit formed thereon.

[0195] In some embodiments, the second insulating layer 22 is formed on the first insulating layer 21 where the heating unit 23 is formed.

[0196] This makes it possible to provide a battery cell 10 that is highly environmentally friendly.

[0197] In some embodiments, the step of forming the first insulating layer 21 includes: applying an insulating coating on at least one outer surface 11 of the housing 1 to form the first insulating layer 21 .

[0198] As a result, the risk of electrical conduction between the heating unit 23 and the housing 1 of the battery cell 10 can be reduced.

[0199] In some embodiments, the step of forming the second insulating layer 22 on the first insulating layer 21 having the heating unit 23 includes: coating the first insulating layer 21 having the heating unit 23 with a photosensitive encapsulation adhesive layer; and irradiating the photosensitive encapsulation adhesive layer with light to cure the photosensitive encapsulation adhesive layer.

[0200] This makes it possible to form an insulating layer with good insulating properties.

[0201] In some embodiments, the method for manufacturing the battery cell 10 further includes: forming a contact electrode 7 and a contact terminal 8 electrically connected to the heating unit 23 of the battery cell 10 on the second insulating layer 22 , wherein the contact electrode 7 is used to electrically connect to the contact terminal 8 of an adjacent battery cell 10 .

[0202] This can provide a battery cell 10 having a simple structure and capable of electrically connecting adjacent battery cells 10 to each other, so that a plurality of battery cells 10 can be electrically heated by a small amount of heating power source.

[0203] A specific embodiment of the present application is described below.

[0204] The overall structure includes a battery 100, a storage space of the battery 100, a battery module 20 located in the storage space, the battery module 20 is formed by electrically connecting the battery cells 10, the battery cells 10 have a shell 1, the heating assembly 2 is located on the four sides 113 of the shell 1, the heating assembly 2 is composed of a first insulating layer 21, a heating unit 23 and a second insulating layer 22 stacked, the heating unit 23 is located between the first insulating layer 21 and the second insulating layer 22; the first insulating layer 21 is stacked with the outer surface 11 of the shell 1, the first insulating layer 21 is located between the outer surface 11 and the heating unit 23, and the thickness L of the heating unit 23 is in the range of 1 micron to 30 microns. There are multiple heating units 23, the positive terminals 231 of the multiple heating units 23 are electrically connected to the positive heating wire 31, and the negative terminals 232 of the multiple heating units 23 are electrically connected to the negative heating wire 32. The second insulating layer 22 is a photosensitive encapsulation glue layer. The power connector 51 is located on the side of the battery module 20. The heating units 23 on different battery cells 10 are electrically connected via the contact electrodes 7 and the contact terminals 8 .

[0205] The heating component 2 is preheated before starting in a cold winter environment, which can improve the discharge efficiency of the battery 100, and the micron-level printed resistor does not increase the assembly size, so that the battery module 20 can maintain the original outline size.

[0206] The heating unit 23 is printed on the outer surface 11 of the shell 1 of the battery cell 10. After the wiring is completed, the photosensitive packaging glue is sprayed on the whole to insulate the whole circuit; the two groups of battery cells 10 are mechanically docked, and the electrode springs are used to contact the contact electrode 7 of the heating component 2 of another battery cell 10 to achieve power interconnection of the heating components 2 between the battery cells 10. The contact electrode 7 is processed by printing wear-resistant silver paste to meet the wear resistance requirements. The power access line is fixed by a board-to-socket method, and the pins are welded to achieve electrical connection with the heating component 2.

[0207] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein.

Claims

1. A battery module, characterized in that: Comprising a plurality of battery cells, The battery cell has a shell, an electrode assembly is contained inside, at least one pole is arranged on the shell, the pole is electrically connected to the electrode assembly, the shell includes a plurality of outer surfaces, the plurality of outer surfaces include a first outer surface opposite to each other, the first outer surface is the surface with the largest area among the plurality of outer surfaces; a heating assembly, formed at least on the first outer surface, the heating assembly comprising a first insulating layer, a heating unit and a second insulating layer which are stacked, the heating unit being located between the first insulating layer and the second insulating layer, and the heating unit being connected to the power supply connection structure; Wherein, the heating unit comprises at least one heating resistor. The thickness of the heating unit in a direction perpendicular to the outer surface where the heating unit is located is between 1 μm and 150 μm, A plurality of battery cells are arranged to form the battery module in such a manner that the first outer surfaces are opposite to each other, and the power supply connection structure includes an interconnection component for electrically connecting the heating unit to the heating unit or the heating power supply of an adjacent battery cell, the interconnection component includes a contact electrode and a contact terminal, the contact terminal includes a positive contact terminal and a negative contact terminal, the contact electrode includes a positive contact electrode and a negative contact electrode, the positive contact terminal and the negative contact electrode are arranged on one of the two first outer surfaces opposite to each other, the positive contact electrode and the negative contact electrode are arranged on the other of the two first outer surfaces opposite to each other, the positive contact terminal is in contact with the positive contact electrode and is electrically connected to each other, and the negative contact terminal is in contact with the negative contact electrode and is electrically connected to each other.

2. The battery module according to claim 1, characterized in that: The number of the heating resistors is multiple, On the same outer surface, a plurality of heating resistors are arranged in an array.

3. The battery module according to claim 2, characterized in that: The heating unit further includes a heating positive line and a heating negative line for electrically connecting to a heating power source. Each of the heating resistors has a positive terminal and a negative terminal. The positive terminal is electrically connected to the heating positive electrode wire, and the negative terminal is electrically connected to the heating negative electrode wire.

4. The battery module according to claim 3, characterized in that: The heating unit is formed by printing.

5. The battery module according to any one of claims 1 to 4, characterized in that: The heating assembly is stacked with the outer surface, and the first insulating layer is located between the outer surface and the heating unit.

6. The battery module according to any one of claims 1 to 4, characterized in that: The plurality of outer surfaces include the first outer surfaces opposite to each other along a first direction, the second outer surfaces opposite to each other along a second direction, and the third outer surfaces opposite to each other along a third direction, the first outer surface, the second outer surface, and the third outer surface are connected to each other, wherein a pole of the battery cell is formed on one of the two third outer surfaces, and the first direction, the second direction, and the third direction are perpendicular to each other, The heating element is formed on the first outer surface and the second outer surface, or the heating element is formed on the first outer surface, the second outer surface and the other of the two third outer surfaces.

7. The battery module according to any one of claims 1 to 4, characterized in that: The material of the first insulating layer includes an aluminum oxide ceramic coating, an aluminum oxide ceramic and titanium oxide composite powder coating, a high molecular ceramic polymer coating or a nano ceramic coating; and / or, The material of the heating unit includes copper, silver, gold or platinum; and / or, The second insulating layer includes a photosensitive packaging glue layer.

8. The battery module according to any one of claims 1 to 4, characterized in that: The contact terminal includes a conductive metal elastic sheet, and the metal elastic sheet is configured to generate an elastic force when pressed.

9. The battery module according to any one of claims 1 to 4, characterized in that: include: The battery module further includes a power connector for electrically connecting to a heating power source and configured to be electrically connected to the power supply connection structure in the heating assembly of at least one of the battery cells.

10. The battery module according to claim 9, characterized in that: The power connector is provided on one or a part of the battery cells and is configured to be electrically connected to the power supply connection structure in the heating assembly of the battery cell provided with the power connector; The heating unit of the battery cell provided with the power connector is electrically connected to at least the heating unit of the adjacent battery cell not provided with the power connector.

11. The battery module according to claim 9, characterized in that: The power connector includes a socket having a positive conductive terminal and a negative conductive terminal; or, The power connector includes a plug provided with a positive conductive terminal and a negative conductive terminal.

12. A battery, characterized in that: The invention comprises a case and at least one battery module according to any one of claims 1 to 11 accommodated in the case.

13. An electrical device, characterized in that: The electrical device comprises the battery module according to any one of claims 1 to 11 or the battery according to claim 12 for providing electrical energy.

14. An energy storage device, characterized in that: The energy storage device comprises the battery module according to any one of claims 1 to 11 or the battery according to claim 12, which is capable of storing electrical energy and providing electrical energy.

15. A method for manufacturing a battery module, characterized in that: The manufacturing method is used to manufacture the battery module according to any one of claims 1 to 11, The battery module manufacturing method comprises: The step of forming the first insulating layer on two first outer surfaces of the shell that are opposite to each other, wherein the first outer surface is the surface with the largest area among the outer surfaces of the shell; The step of printing the heating unit on the first insulating layer, wherein the thickness of the heating unit in a direction perpendicular to the outer surface where the heating unit is located is between 1 micrometer and 150 micrometers; and forming the second insulating layer on the first insulating layer having the heating unit formed thereon; A contact electrode and a contact terminal electrically connected to the heating unit of the battery cell are formed on the second insulating layer, the contact electrode is used to electrically connect to the contact terminal of the adjacent battery cell, the contact terminal includes a positive contact terminal and a negative contact terminal, the contact electrode includes a positive contact electrode and a negative contact electrode, the positive contact terminal and the negative contact terminal are formed on one of the two first outer surfaces opposite to each other, the positive contact electrode and the negative contact electrode are formed on the other of the two first outer surfaces opposite to each other, a plurality of the battery cells are arranged into the battery module in such a manner that the first outer surfaces are opposite to each other, the positive contact terminal is in contact with the positive contact electrode, and the negative contact terminal is in contact with the negative contact electrode.

16. The method for manufacturing a battery module according to claim 15, characterized in that: The step of forming the first insulating layer comprises: An insulating coating is applied on the first outer surface of the shell to form the first insulating layer.

17. The method for manufacturing a battery module according to claim 16, characterized in that: The step of forming the second insulating layer on the first insulating layer having the heating unit formed thereon comprises: Applying a photosensitive encapsulation adhesive layer to the first insulating layer formed with the heating unit; The photosensitive encapsulation adhesive layer is irradiated with light to solidify the photosensitive encapsulation adhesive layer.

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