Battery and electrical device

Abstract

To provide a battery (10) and an electrical device with good heat dissipation performance.SOLUTION: A battery (10) according to the present application includes a plurality of cylindrical battery cells (20), a main body (31), and at least one ventilation passage (32) penetrating the main body (31) in a first direction (X), the first direction (X) being parallel to the axial direction of the plurality of battery cells (20), and an air-cooling structure (30) having a fin-shaped cross section of the ventilation passage (32) perpendicular to the first direction (X).SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This application claims the priority of a utility model application with application number 202220076160.4 and application title "Battery and Electrical Equipment", which was filed with the China National Intellectual Property Administration on January 12, 2022, and the entire content thereof is incorporated herein by reference.

[0002] This application relates to the field of battery technology, and particularly to batteries and electrical equipment.

Background Art

[0003] Due to advantages such as high energy density, rechargeability, safety, and environmental friendliness, power batteries are widely applied in fields such as new energy vehicles, household electrical appliances, and energy storage systems.

[0004] However, heat is generated during the use of power batteries, which affects the performance of power batteries and may cause serious safety problems. To ensure the normal use of power batteries, it is necessary to dissipate heat from the power batteries.

Summary of the Invention

Problems to be Solved by the Invention

[0005] This application provides a battery and an electrical equipment with good heat dissipation performance.

Means for Solving the Problems

[0006] In a first aspect, there is provided a battery including a plurality of cylindrical battery cells, a main body, and at least one ventilation passage penetrating the main body in a first direction, the first direction being parallel to the axial direction of the plurality of battery cells, and an air-cooling structure in which a cross-section of the ventilation passage perpendicular to the first direction is in a fin shape.

[0007] Based on the solution of this technology, the battery adopts an air-cooling structure. The air-cooling structure includes a main body and a ventilation passage that penetrates the main body along the axial direction of the battery cells. The wind introduced into the ventilation passage can take away the heat generated by the plurality of battery cells, and has good heat dissipation performance. And since the shape of the cross-section perpendicular to the first direction of the ventilation passage is fin-shaped, such a fin-shaped cross-sectional shape of the ventilation passage combines heat dissipation efficiency and process feasibility, increases the heat exchange area between the air-cooling structure and the battery cells, and can also guarantee the feasibility of the process.

[0008] In one possible form, the plurality of battery cells are installed so as to surround the air-cooling structure. By installing a plurality of cylindrical battery cells so as to surround the air-cooling structure, the wind introduced into the ventilation passage can effectively take away the heat of each battery cell, and the overall heat dissipation efficiency can be improved.

[0009] In one possible form, the plurality of battery cells are attached to the first surface of the main body away from the ventilation passage with an adhesive for a heat-conductive structure.

[0010] The adhesive for a heat-conductive structure is used to realize the connection between the battery cells and the air-cooling structure. And since the adhesive for a heat-conductive structure has good heat conductivity, attaching a plurality of battery cells around the first surface of the ventilation passage with the adhesive for a heat-conductive structure helps to conduct the heat generated by the plurality of battery cells to the ventilation passage, and further improves the heat dissipation efficiency.

[0011] In one possible form, the contour shape of the region attached to the plurality of battery cells on the first surface matches the contour shape of the surface of the plurality of battery cells. This increases the heat dissipation area of the plurality of battery cells and further improves the heat dissipation efficiency.

[0012] In one possible form, the air-cooling structure further includes a fan. The fan is used to pass wind through the ventilation passage to discharge the heat generated by the plurality of battery cells. The fan can increase the wind speed in the ventilation passage and improve the heat dissipation efficiency of the battery cells.

[0013] In one possible embodiment, the battery further includes a box, the box includes a first box part and a second box part, the first box part and the second box part engage to form a receiving cavity for receiving the air-cooling structure and the plurality of battery cells, and at least one of the first box part and the second box part has an opening, and a plane where the opening is located is parallel to the first direction.

[0014] Installing the box so that the first box part and the second box part are engaged facilitates the assembly of the air-cooling structure and the plurality of battery cells within the box.

[0015] In one possible embodiment, a first heat dissipation part is installed on the bottom wall of the first box part, and a contour shape of a region of the first heat dissipation part that contacts the plurality of battery cells matches a contour shape of surfaces of the plurality of battery cells.

[0016] The first heat dissipation part may be a part of the bottom wall of the first box part, or may be a structure provided separately relative to the bottom wall of the first box part. The first heat dissipation part is a follow-up design, and a contour shape of a region of the first heat dissipation part that contacts the plurality of battery cells is designed to match a contour shape of surfaces of the plurality of battery cells, thereby increasing a heat dissipation area of the plurality of battery cells and further improving heat dissipation efficiency.

[0017] In one possible embodiment, a second heat dissipation part is installed on the bottom wall of the second box part, and a contour shape of a region of the second heat dissipation part that contacts the plurality of battery cells matches a contour shape of surfaces of the plurality of battery cells.

[0018] The second heat dissipation part may be a part of the bottom wall of the second box part, or may have a structure provided independently relative to the bottom wall of the second box part. The second heat dissipation part has an imitation design, and the contour shape of the region in the second heat dissipation part that contacts the plurality of battery cells is designed to match the contour shape of the surfaces of the plurality of battery cells, thereby increasing the heat dissipation area of the plurality of battery cells and further improving the heat dissipation efficiency.

[0019] In one possible embodiment, the air-cooling structure is formed by a die-casting process, which has a simple process and high reliability.

[0020] In a second aspect, there is provided an electrical device including the battery described in the first aspect or any possible embodiment in the first aspect, wherein the battery is used to supply electrical energy to the electrical device.

[0021] As can be seen from the above, the battery adopts an air-cooling structure. The air-cooling structure includes a main body and a ventilation passage that penetrates the main body along the axial direction of the battery cells. The heat generated by the plurality of battery cells can be taken away by the air introduced into the ventilation passage. Since the cross-section perpendicular to the first direction of the ventilation passage is fin-shaped, such a fin-shaped cross-sectional shape of the ventilation passage combines heat dissipation efficiency and process feasibility, increases the heat exchange area between the air-cooling structure and the battery cells, and can also guarantee the feasibility of the process.

[0022] In a third aspect, there is provided a method for manufacturing a battery, including the steps of providing a plurality of cylindrical battery cells, providing an air-cooling structure including a main body and at least one ventilation passage penetrating the main body, installing the at least one ventilation passage along a first direction X, the first direction X being parallel to the axial direction of the plurality of battery cells, and making the cross-section perpendicular to the first direction X of the ventilation passage fin-shaped.

[0023] A first providing module for providing a plurality of cylindrical battery cells, a second providing module for providing an air-cooling structure including a main body and at least one ventilation passage penetrating the main body, and at least one ventilation passage is installed along a first direction X, the first direction X is parallel to the axial direction of the plurality of battery cells, and an assembling module for making a cross-section perpendicular to the first direction X of the ventilation passage fin-shaped, and further provide a manufacturing apparatus for a battery including the above.

[0024] To more clearly explain the technical solutions in the embodiments of the present application, the drawings necessary for the embodiments of the present application are briefly introduced below. It should be understood that the following drawings are only some embodiments of the present application, and those skilled in the art can further obtain other drawings based on these drawings without creative efforts. [Appended Claim 1] A plurality of cylindrical battery cells, An air-cooling structure including a main body and at least one ventilation passage penetrating the main body in a first direction, the first direction is parallel to the axial direction of the plurality of battery cells, and a cross-section perpendicular to the first direction of the ventilation passage is fin-shaped, A battery including the above. [Appended Claim 2] The battery according to appended claim 1, wherein the plurality of battery cells are installed so as to surround the air-cooling structure. [Appended Claim 3] The battery according to appended claim 1 or 2, wherein the plurality of battery cells are attached to a first surface of the main body away from the ventilation passage by an adhesive for a heat-conductive structure. [Appended Claim 4] The battery according to appended claim 3, wherein the contour shape of the region attached to the plurality of battery cells on the first surface matches the contour shape of the surface of the plurality of battery cells. [Appended Claim 5] The battery according to any one of appended claims 1 to 4, wherein the air-cooling structure further includes a fan, and the fan is used to discharge heat generated by the plurality of battery cells by passing air through the ventilation passage. [Appended Claim 6] The battery further includes a box, the box includes a first box part and a second box part, the first box part and the second box part engage to form a receiving cavity for receiving the air-cooling structure and the plurality of battery cells, at least one of the first box part and the second box part has an opening, and a plane where the opening is located is parallel to the first direction. The battery according to any one of claims 1 to 5. [Claim 7] A first heat dissipation part is installed on the bottom wall of the first box part, and a contour shape of a region in the first heat dissipation part that contacts the plurality of battery cells matches a contour shape of a surface of the plurality of battery cells. The battery according to claim 6. [Claim 8] A second heat dissipation part is installed on the bottom wall of the second box part, and a contour shape of a region in the second heat dissipation part that contacts the plurality of battery cells matches a contour shape of a surface of the plurality of battery cells. The battery according to claim 6 or 7. [Claim 9] The air-cooling structure is formed by a die-casting process. The battery according to any one of claims 1 to 8. [Claim 10] In an electrical device including the battery according to any one of claims 1 to 9, the battery is used to supply electrical energy to the electrical device. An electrical device. [Claim 11] The step of providing a plurality of battery cells that are cylindrical; UThe step of providing an air-cooling structure including a main body and at least one ventilation passage penetrating the main body; The step of installing the at least one ventilation passage along a first direction, the first direction being parallel to an axial direction of the plurality of battery cells, and making a cross section of the ventilation passage perpendicular to the first direction fin-shaped; A method for manufacturing a battery including the above. [Claim 12] A first providing module for providing a plurality of battery cells that are cylindrical; A second providing module for providing an air-cooling structure including a main body and at least one ventilation passage penetrating the main body; An assembly module for installing the at least one ventilation duct along a first direction, the first direction being parallel to the axial direction of the plurality of battery cells, and the cross-section of the ventilation duct perpendicular to the first direction being fin-shaped, A battery manufacturing apparatus including the same.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0026] In the drawings, the drawings are not drawn to actual scale. The embodiments of the present application will be described in more detail below with reference to the drawings and examples. The following detailed description of the examples and the drawings are used to exemplarily explain the principle of the present application, but do not limit the scope of the present application, that is, the present application is not limited to the described examples.

[0027] In the description of the present application, unless otherwise explained, the meaning of "a plurality" is two or more, and the orientation or positional relationship indicated by terms such as "above", "below", "left", "right", "inside", "outside", etc. is only for facilitating the description of the present application and simplifying the description, and does not indicate or imply that the target device or element should have a specific orientation and be configured and operated in a specific orientation. Therefore, it should not be understood as limiting the present application. Further, terms such as "first", "second", "third", etc. are only used for the purpose of description and should not be interpreted as indicating or implying relative importance. "Vertical" is not vertical in the strict sense but is within the allowable error range. "Parallel" is not parallel in the strict sense but is within the allowable error range.

[0028] All the orientation expressions appearing in the following description are in the directions shown in the figures and do not limit the specific structure of the present application. What should be further explained in the description of the present application is that, unless otherwise clearly defined and limited separately, the terms "attach", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral connection. It may be directly connected or indirectly connected through an intermediate medium. A person skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0029] The term "and / or" in the present application merely describes the relationship between related objects and indicates that three types of relationships are possible. For example, A and / or B can indicate three situations: A exists alone, A and B exist simultaneously, and B exists alone. Note that in the present application, the symbol " / " generally indicates that the related objects before and after are in an "or" relationship.

[0030] Unless otherwise defined, all technical and scientific terms used in this application shall have the same meaning as commonly understood by those skilled in the art of this application. The terms used in the description of the application in this application are for the sole purpose of explaining specific embodiments and are not intended to limit this application. The terms "comprising" and "having" and any variations thereof in the description of the specification, claims and drawings of this application are intended to cover non-exclusive inclusion. The terms such as "first", "second", etc. in the description of the specification, claims or drawings of this application are used to distinguish different objects and are not used to explain a specific order or primary-secondary relationship.

[0031] References to "embodiments" in this application mean that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. Although this word appears in each part of this specification, it does not necessarily refer to the same embodiment, nor does it refer to mutually exclusive, independent or alternative embodiments with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in this specification can be combined with other embodiments.

[0032] This application has been described with reference to the preferred embodiments, but various improvements can be made and its components can be replaced with equivalents without departing from the scope of this application. In particular, each technical feature mentioned in each embodiment can be combined in any way as long as there is no structural contradiction. This application is not limited to the specific embodiments disclosed in this specification and includes all technical solutions included in the claims.

[0033] In the present application, the battery cell can 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. The battery cell is generally also called a cell. The battery cell may be cylindrical, flat, cuboid, or other regular or irregular shape. The technical solution of the embodiments of the present application can be applied to battery cells of any shape, but in particular, it is suitable for cylindrical battery cells and dissipates heat from the cylindrical battery cells.

[0034] The battery referred to in the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery referred to in the present application can include a battery module, a battery pack, or the like. The battery generally includes a box for packaging one or more battery cells. The box prevents liquid or other foreign matter from affecting the charge and discharge of the battery cells.

[0035] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell operates mainly by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer coated thereon. The positive electrode current collector without the positive electrode active material layer is used as the positive electrode tab. 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, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer coated thereon. The negative electrode current collector without the negative electrode active material layer is used as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. To ensure that fusing does not occur under a large current, the number of positive electrode tabs is plural and they are laminated together, and the number of negative electrode tabs is plural and they are laminated together. The material of the separator may be polypropylene (PP) or polyethylene (PE), etc. Also, the electrode assembly may have a wound structure or a laminated structure, and the present application is not limited thereto.

[0036] The battery box can further include a signal transmission assembly. The signal transmission assembly is used to transmit signals such as the voltage and / or temperature of the battery cells. The signal transmission assembly can include a bus bar for realizing electrical connections between a plurality of battery cells, such as parallel connection, series connection, or series-parallel connection. The bus bar can realize the electrical connection between battery cells by connecting the electrode terminals of the battery cells. In some embodiments, the bus bar may be fixed to the electrode terminals of the battery cells by welding. The bus bar transmits the voltage of the battery cells. When a plurality of battery cells are connected in series, a high voltage can be obtained. Accordingly, the electrical connection formed by the bus bar is also called a "high-voltage connection".

[0037] In addition to the bus bar, the signal transmission assembly can further include a sensor device for detecting the state of the battery cells. For example, the sensor device can be used to measure and transmit detection signals such as the temperature and charge state of the battery cells. In the present application, the electrical connection members in the battery can include the bus bar and / or the sensor device.

[0038] The bus bar and the sensor device can be packaged in an insulating layer to form a signal transmission assembly. Accordingly, the signal transmission assembly can be used to transmit the voltage and / or detection signals of the battery cells. There is no insulating layer at the connection location between the signal transmission assembly and the electrode terminals of the battery cells, that is, the insulating layer has an opening at that location, thereby being connected to the electrode terminals of the battery cells.

[0039] In the development of battery technology, it is necessary to consider various design elements simultaneously, such as performance parameters like energy density, cycle life, discharge capacity, charge-discharge efficiency, etc. Also, it is necessary to consider the safety of the battery.

[0040] Since power batteries continuously generate heat during use, if the amount of heat generated is too large, serious safety problems will be caused. To ensure the safety of power batteries, it is necessary to dissipate heat from power batteries.

[0041] In view of this, the present application provides a technical solution, in which an air-cooling structure is installed and a plurality of battery cells are installed so as to surround the air-cooling structure, thereby effectively utilizing the air introduced into the ventilation path to take away the heat of the battery cells and having good heat dissipation performance.

[0042] The technical solution described in the present application is applicable to various electrical devices using batteries, such as vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys, electric tools, etc. The vehicle may be a gasoline vehicle, a natural gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range extender vehicle, etc. The spacecraft includes aircraft, rockets, space shuttles and spaceships, etc. The electric toys include fixed or mobile electric toys such as game consoles, electric vehicle toys, electric ship toys and electric aircraft toys. The electric tools include metal cutting electric tools such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators and electric planers, grinding electric tools, assembly electric tools and railway electric tools.

[0043] Hereinafter, for the convenience of explanation, the vehicle will be taken as an example to explain the electrical device.

[0044] For example, FIG. 1 shows a schematic structure diagram of a vehicle 1 to which the embodiments of the present application can be applied. The vehicle 1 may be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range extender vehicle, or the like. A motor 40, a controller 80, and a battery 10 can be installed inside the vehicle 1. The controller 80 is used to control the battery 10 to supply power to the motor 40. For example, the battery 10 can be installed at the bottom, the front side, or the rear side of the vehicle 1. The battery 10 is used for power supply of the vehicle 1. For example, the battery 10 can be used as the operating power source of the vehicle 1 and can be used in the circuit system of the vehicle 1. For example, it can meet the requirements of the vehicle 1 for startup, navigation, and working power during driving. In some embodiments, the battery 10 can not only be used as the operating power source of the vehicle 1 but also as the driving power source of the vehicle 1 to provide driving power for the vehicle 1 instead of or partially replacing fuel or natural gas.

[0045] To meet the demands of various power usages, the battery 10 can include a plurality of battery cells. For example, it can include a plurality of cylindrical battery cells. Here, the plurality of battery cells can be connected in series, in parallel, or in series-parallel connection. The series-parallel connection refers to a mixture of series connection and parallel connection. The battery is also called a battery pack. In some embodiments, the plurality of battery cells can first be connected in series, in parallel, or in series-parallel connection to form a battery module, and then a plurality of battery modules can be further connected in series, in parallel, or in series-parallel connection to form the battery 10. That is, the plurality of battery cells can directly form the battery 10, or first form a battery module, and then form the battery 10 with the battery module.

[0046] For example, FIG. 2 shows a schematic diagram of the structure of the battery 10 in the embodiment of the present application. The battery 10 can include a plurality of battery cells 20. In addition to the battery cells 20, the battery 10 can further include a box 11 (also called a cover). The inside of the box 11 has a hollow structure, and the plurality of battery cells 20 can be accommodated in the box 11. As shown in FIG. 2, the box 11 can include two parts, which are herein referred to as the first box part 111 and the second box part 112 respectively. The first box part 111 and the second box part 112 are integrally engaged. The shapes of the first box part 111 and the second box part 112 are determined by the shape formed by combining the plurality of battery cells 20, and at least one of the first box part 111 and the second box part 112 has one opening. For example, both the first box part 111 and the second box part 112 are hollow rectangular parallelepipeds and only one surface of each is the opening surface. The opening of the first box part 111 and the opening of the second box part 112 are arranged opposite to each other, and the first box part 111 and the second box part 112 may be engaged with each other to form a box 11 having a closed cavity. As another example, only one of the first box part 111 and the second box part 112 may be a hollow rectangular parallelepiped having an opening, and the other may be plate-shaped and cover the opening. The number of battery cells 20 can be set to any number according to the power demand. The plurality of battery cells 20 may be connected in series, in parallel, or in a series-parallel connection form to achieve a larger capacity or power. After the plurality of battery cells 20 are connected and combined in parallel, in series, or in a series-parallel connection with each other, they are arranged in the box 11 formed by engaging the first box part 111 and the second box part 112.

[0047] In some embodiments, the battery 10 may further include other structures, which will not be described here one by one. For example, the battery 10 may further include a bus bar for establishing electrical connection between the plurality of battery cells 20. Specifically, the bus bar can connect the electrode terminals of the battery cells 20 to establish electrical connection between the battery cells 20. In some embodiments, the bus bar may be fixed to the electrode terminals of the battery cells 20 by welding. Electrical energy from the plurality of battery cells 20 may be further extracted through the box via a conductive mechanism. The conductive mechanism may belong to the bus bar.

[0048] For convenience of explanation, the following description will be mainly based on the cylindrical battery cell 20 shown in FIG. 2 as an example.

[0049] 3 is a structural schematic diagram of a battery 10 according to an embodiment of the present application. As shown in FIGS. 2 and 3, the battery 10 includes an air-cooling structure 30 and a plurality of battery cells 20. The plurality of battery cells 20 are cylindrical.

[0050] Here, the air-cooling structure 30 includes a main body 31 and at least one ventilation passage 32 penetrating the main body 31 in a first direction X, the first direction X being parallel to the axial direction of the plurality of battery cells 20, and the cross section of the ventilation passage 32 perpendicular to the first direction X being fin-shaped.

[0051] 2 and 3, when air is introduced into the ventilation passage 32, the air can remove heat generated by the multiple battery cells 20 surrounding the air-cooling structure 30. The cross-sectional shape of the ventilation passage 32 perpendicular to the first direction X is related to the heat dissipation efficiency of the battery cells 20; the larger the cross-sectional area of the ventilation passage 32, the higher the heat dissipation efficiency, but the more complicated the manufacturing process. The cross-sectional shape of the ventilation passage 32 can be optimized, for example, by methods such as thermal simulation, while ensuring process feasibility.

[0052] In the embodiment of the present application, a cross-section perpendicular to the first direction X of the ventilation path 32 is fin-shaped. In the air-cooled structure 30 formed by adopting a die-casting process, by adopting a fin-shaped cross-sectional shape of the ventilation path, it has both heat dissipation efficiency and process feasibility. It not only increases the heat exchange area between the air-cooled structure 30 and the battery cells 20, but also has the feasibility of the die-casting process.

[0053] The air-cooled structure 30 can be formed by a die-casting process or the like, the process is simple, and the reliability is high.

[0054] The present application does not limit the number and position of the ventilation paths 32. In FIG. 3, 10 ventilation paths are taken as an example, and the 10 ventilation paths are arranged and installed along the second direction Y, and the second direction Y is perpendicular to the first direction X. Here, a cross-section perpendicular to the first direction X of each ventilation path 32 is fin-shaped. For example, among the 10 ventilation paths arranged along the second direction Y in FIG. 3, the fin shape may be similar to the shape of the letter "E" in the alphabet for the 3 ventilation paths 32 located on the leftmost side and the 3 ventilation paths 32 located on the rightmost side. As another example, among the 10 ventilation paths arranged along the second direction in FIG. 3, the fin shape may be similar to the shape of the Chinese character "Wang" formed by putting two "E"s back to back for the 4 ventilation paths 32 located in the middle.

[0055] As can be seen from the above, the battery 10 adopts an air-cooled structure 30. The air-cooled structure 30 includes a main body 31 and a ventilation path 32 that penetrates the main body 31 along the axial direction of the battery cells 20, that is, the first direction X. The heat generated by the plurality of battery cells 20 can be taken away by the air introduced into the ventilation path 32, and it has good heat dissipation performance, giving the battery 10 high safety. And because the cross-section perpendicular to the first direction X of the ventilation path 32 is fin-shaped, such a fin-shaped cross-sectional shape of the ventilation path has both heat dissipation efficiency and process feasibility. It not only increases the heat exchange area between the air-cooled structure and the battery cells, but also can guarantee the feasibility of the process.

[0056] The position of the printed circuit board assembly (PCBA) 201 of the battery management system (BMS) in the box 11 is shown in FIG. 3, but for simplicity and clarity, its specific structure is not shown in FIG. 3.

[0057] In one embodiment, as shown in FIGS. 2 and 3, a plurality of battery cells 20 are installed to surround the air-cooling structure 30. By installing a plurality of cylindrical battery cells 20 to surround the air-cooling structure 30, the air introduced into the ventilation path 32 can effectively take away the heat of each battery cell 20, and the overall heat dissipation efficiency can be improved.

[0058] In one embodiment, as shown in FIGS. 2 and 3, the battery 10 further includes a box 11, the box 11 includes a first box portion 111 and a second box portion 112, and the first box portion 111 and the second box portion 112 are engaged to form a receiving cavity for receiving the air-cooling structure 30 and a plurality of battery cells 20. At least one of the first box portion 111 and the second box portion 112 has an opening, and the plane where the opening is located is parallel to the first direction X. By installing the box 11 so that the first box portion 111 and the second box portion 112 are engaged, the assembly of the air-cooling structure 30 and the plurality of battery cells 20 in the box 11 is facilitated.

[0059] Since the plurality of battery cells 20 are accommodated in the accommodation space formed by engaging the first box portion 111 and the second box portion 112, in one embodiment, the first box portion 111 and the second box portion 112 can be further used for the heat dissipation of the plurality of battery cells 20.

[0060] As an example, a first heat dissipation portion 1110 is installed on the bottom wall of the first box portion 111, and the contour shape of the region in contact with the plurality of battery cells 20 in the first heat dissipation portion 1110 matches the contour shape of the surface of the plurality of battery cells 20.

[0061] Here, the first heat dissipation part 1110 is a mimicking design, and the contour shape of the region where it contacts the plurality of battery cells 20 is designed to match the contour shape of the surfaces of the plurality of battery cells 20. The first heat dissipation part 1110 may be a part of the bottom wall of the first box part 111, or may be a structure independently provided on the bottom wall of the first box part 111 opposite to the first box part 111. As shown in FIG. 4, the first heat dissipation part 1110 is a heat conduction plate installed on the bottom wall of the first box part 111, and the contour of the region on the surface of the heat conduction plate that contacts the plurality of battery cells 20 is arc-shaped, and its curvature is the same as the arc curvature of the corresponding position on the surface of the battery cell 20. Thereby, the heat dissipation area of the battery cell 20 is increased. The black dashed arrows in FIG. 4 indicate the heat dissipation directions of the plurality of battery cells 20. Except for the battery cells 20 located at both ends in the second direction Y, the heat released by the other battery cells 20 is not only taken away by the wind introduced into the ventilation path 32, but also taken away by the bottom wall of the first box part 111, further improving the heat dissipation efficiency.

[0062] As another example, a second heat dissipation part 1120 is installed on the bottom wall of the second box part 112, and the contour shape of the region where the second heat dissipation part 1120 contacts the plurality of battery cells 20 matches the contour shape of the surfaces of the plurality of battery cells 20.

[0063] Here, the second heat dissipation portion 1120 is a copy design, and the contour shape of the area where it contacts the plurality of battery cells 20 is designed to match the contour shape of the surface of the plurality of battery cells 20. The second heat dissipation portion 1120 may be part of the bottom wall of the second box portion 112, or may be a structure provided independently on the bottom wall of the second box portion 112 facing the second box portion 112. As shown in FIG. 4 , the bottom wall of the second box portion 112 faces the surface of the battery cells 20 to form the second heat dissipation portion 1120. The contour of the area of the second heat dissipation portion 1120 where it contacts the plurality of battery cells 20 is arc-shaped, and the curvature of the arc is the same as the curvature of the arc at the position corresponding to the surface of the battery cells 20, thereby increasing the heat dissipation area of the battery cells 20. The black dashed arrows in Figure 4 indicate the heat dissipation direction of the multiple battery cells 20, and in addition to the battery cells 20 located at both ends in the second direction Y, the heat emitted by the other battery cells 20 is not only absorbed by the wind introduced into the ventilation passage 32, but also by the bottom wall of the second box section 112, further improving the heat dissipation efficiency.

[0064] In one implementation, as shown in FIGS. 3 and 4, the plurality of battery cells 20 are attached to a first surface 313 of the body 31 away from the air passage 32 by a thermally conductive structural adhesive 34 .

[0065] The thermally conductive structural adhesive 34 is used to connect the battery cells 20 and the air-cooling structure 30. Furthermore, because the thermally conductive structural adhesive 34 has good thermal conductivity, using the thermally conductive structural adhesive 34 to attach the plurality of battery cells 20 to the first surface 313 of the ventilation passage 32 helps to conduct the heat generated by the plurality of battery cells 20 to the ventilation passage 32, further improving heat dissipation efficiency.

[0066] In one embodiment, the contour shape of the area of the first surface 313 of the body 31 that is attached to the plurality of battery cells 20 matches the contour shape of the surfaces of the plurality of battery cells 20 .

[0067] For example, as shown in FIGS. 3 to 5, the contour of the area attached to the plurality of battery cells 20 on the first surface 313 of the main body 31 is arc-shaped, and its curvature is the same as the arc curvature at the position corresponding to the surface of the battery cell 20. Thereby, the contact area between the battery cell 20 and the first surface 313 is increased, the heat dissipation area of the plurality of battery cells 20 is increased, and the heat dissipation efficiency is further improved.

[0068] In one implementation form, as shown in FIGS. 3 to 5, weight reduction grooves 314 are provided in the area on the first surface 313 of the main body 31 that is not attached to the plurality of battery cells 20.

[0069] The main body 31 of the air-cooling structure 30 is generally made of a metal material such as an aluminum material and has a large weight. Therefore, by providing the weight reduction grooves 314 in the non-heat dissipation area that does not contact the battery cells 20 of the main body 31, the weight of the air-cooling structure 30 can be reduced. The present application does not limit the number and size of the weight reduction grooves 314. FIGS. 3 to 5 show eight weight reduction grooves.

[0070] In one implementation form, the air-cooling structure 30 further includes a cover plate 33. Here, the cover plate 33 and the first end portion 311 of the main body 31 are fixed via a first bolt 41. The first end portion 311 is the end portion where the air outlet of the ventilation path 32 is located in the first direction X, and is also called the rear portion of the air-cooling structure 30.

[0071] As shown in FIGS. 7 and 8, the air-cooling structure 30 and the plurality of battery cells 20 are housed in the box 11. A cover plate 33 is installed at the end where the air outlet of the air-cooling structure 30 is located, and the cover plate 33 and the main body 31 of the air-cooling structure 30 are assembled integrally via the first bolt 41. After connecting the air-cooling structure 30 and the plurality of battery cells 20 with a heat-conductive structure adhesive 34 to form a module, the module is placed into the box 11 from the opening of the second box part 112, and further the cover plate 33 can be fixed to the first end 311 of the main body 31 via the first bolt 41. This not only meets the requirements for the assembly of the battery 10, but also realizes the assembly of the air-cooling structure 30 and the plurality of battery cells 20 within the box 11, and further the cover plate 33 can seal the plurality of battery cells 20.

[0072] In one implementation form, as shown in FIG. 7, a first sealing member 51 is installed between the cover plate 33 and the first end 311 of the main body 31. The first sealing member 51 realizes the seal between the cover plate 33 and the main body 31 at the location of the air outlet, places the battery cell 20 in a sealed space, and can guarantee the requirements for the airtightness of the battery cell 20.

[0073] In one implementation form, as shown in FIG. 7, a second sealing member 52 is installed between the cover plate 33 and the box 11. The second sealing member 52 realizes the seal between the cover plate 33 and the box 11 at the location of the air outlet, places the battery cell 20 in a sealed space, and can guarantee the requirements for the airtightness of the battery cell 20.

[0074] As can be seen from the above, at the location of the air outlet, by sealing between the cover plate 33 and the air-cooling structure 30 with the first sealing member 51 and sealing between the cover plate 33 and the box 11 with the second sealing member 52, after the plurality of battery cells 20 are installed so as to surround the air-cooling structure 30, they are placed in the sealed space formed by the box 11, the cover plate 33, and the air-cooling structure 30, and the requirements for the airtightness of the battery cell 20 can be guaranteed.

[0075] In one embodiment, as shown in FIG. 7, there is a gap 60 between the cover plate 33 and the end faces of the plurality of battery cells 20. The gap 60 between the cover plate 33 and the end faces of the battery cells 20 can be designed according to the assembly requirements, and the gap 60 is used to leave sufficient space for the automatic assembly of the battery 10.

[0076] In one embodiment, between the second end portion 312 of the main body 31 of the air-cooling structure 30 and the box 11, it is fixed via a second bolt 42. Here, the second end portion 312 is the end portion where the suction port of the ventilation passage 32 is located in the first direction X, and is also called the front portion of the air-cooling structure.

[0077] As shown in FIGS. 6 and 8, the air-cooling structure 30 and the plurality of battery cells are accommodated in the box 11, and the main body 31 of the air-cooling structure 30 and the box 11 are integrally assembled via the second bolt 42. After connecting the air-cooling structure 30 and the plurality of battery cells with a heat-conductive structure adhesive 34 to form a module, the module is put into the box 11 from the opening of the second box portion 112, and further, the second end portion 312 of the main body 31 and the box 11 can be fixed via the second bolt 42. Thereby, not only the assembly requirements of the battery 10 are satisfied, but also the assembly of the air-cooling structure 30 and the plurality of battery cells within the box 11 is realized, and further, the sealing of the plurality of battery cells can be realized.

[0078] In one embodiment, as shown in FIG. 8, a third seal member 53 is installed between the second end portion 312 of the main body 31 and the box 11. By means of the third seal member 53, sealing between the box 11 and the air-cooling structure 30 at the location of the suction port is realized, the battery cells are placed in a sealed space, and the requirements for the airtightness of the battery cells can be guaranteed.

[0079] In one implementation, the air-cooling structure 30 further includes a fan 70. The fan 70 is used to discharge the heat generated by the plurality of battery cells 20 by passing air through the ventilation path 32. The fan 70 can increase the wind speed in the ventilation path 32 and improve the heat dissipation efficiency of the battery cells 20.

[0080] As shown in FIG. 8, the fan 70 is installed at the suction port. The fan 70 is, for example, an axial flow fan and is used to generate cold air along the first direction X. When the cold air passes through the ventilation path 32, the heat generated by the battery cells 20 can be discharged from the inside of the battery 10, thereby reducing the temperature of the battery 10.

[0081] An embodiment of the present application further provides an electrical device, and the electrical device can include the battery 10 in each of the above embodiments so as to be used to supply electrical energy thereto.

[0082] The battery 10 of the above embodiment is installed in the electrical device. Here, in the battery 10, a plurality of cylindrical battery cells 20 are installed so as to surround the air-cooling structure 30, and the air-cooling structure 30 includes a main body 31 and a ventilation path 32 that penetrates the main body 31 along the axial direction of the battery cell, that is, the first direction X. The heat generated by the plurality of battery cells 20 can be taken away by the air introduced into the ventilation path 32, and it has good heat dissipation performance, gives the battery 10 high safety, and is useful for the popularization and use of the electrical device.

[0083] The battery 10 and the electrical device 1 of the embodiments of the present application have been described above. Hereinafter, a manufacturing method 300 and a manufacturing apparatus 400 of the battery 10 of the embodiments of the present application will be described. For parts not described in detail here, reference can be made to the above embodiments.

[0084] FIG. 9 shows a schematic flowchart of a manufacturing method 300 of the battery 10 in an embodiment of the present application. As shown in FIG. 9, the manufacturing method 300 includes a step 310 of providing a plurality of cylindrical battery cells 20, a step 320 of providing an air-cooling structure 30 including a main body 31 and at least one ventilation passage 32 penetrating the main body 31, and a step 330 of installing at least one ventilation passage 32 along a first direction X, where the first direction X is parallel to the axial direction of the plurality of battery cells 20, and making a cross-section perpendicular to the first direction X of the ventilation passage 32 in a fin shape.

[0085] FIG. 10 is a schematic block diagram of a manufacturing apparatus 400 of the battery 10 in an embodiment of the present application. As shown in FIG. 10, the manufacturing apparatus 400 includes a first providing module 410 for providing a plurality of cylindrical battery cells 20, a second providing module 420 for providing an air-cooling structure 30 including a main body 31 and at least one ventilation passage 32 penetrating the main body 31, and an assembling module 430 for installing at least one ventilation passage 32 along a first direction X, where the first direction X is parallel to the axial direction of the plurality of battery cells 20, and making a cross-section perpendicular to the first direction X of the ventilation passage 32 in a fin shape.

[0086] Although the present application has been described with reference to preferred embodiments, various improvements can be made and its components can be replaced with equivalents without departing from the scope of the present application. In particular, each technical feature mentioned in each embodiment can be combined in any way as long as there is no structural contradiction. The present application is not limited to the specific embodiments disclosed in this specification and includes all technical solutions included in the scope of the claims.

Explanation of Reference Numerals

[0087] 1 Vehicle 10 Battery 11 Box 20 Battery Cell 30 Air-Cooling Structure 31 Main Body 32 Ventilation Passage 33 Cover Plate 34 Adhesive for Heat-Conductive Structure 40 Motor 41 First bolt 42 Second bolt 51 First seal member 52 Second seal member 53 Third seal member 60 Gap 70 Fan 80 Controller 111 First box part 112 Second box part 201 Printed circuit board assembly 311 First end 312 Second end 313 First surface 314 Weight reduction groove 400 Manufacturing apparatus 410 First supply module 420 Second supply module 430 Assembly module 1110 First heat dissipation part 1120 Second heat dissipation part

Claims

1. A plurality of cylindrical battery cells, including a main body and at least one ventilation passage penetrating the main body in a first direction, the first direction being parallel to the axial direction of the plurality of battery cells, and an air-cooling structure in which a cross-section of the ventilation passage perpendicular to the first direction is fin-shaped, comprising, further including a box for accommodating the plurality of battery cells, the air-cooling structure further includes a cover plate, the cover plate is fixedly connected to a first end of the main body, the first end is an end where an air outlet of the ventilation passage in the first direction is located, a first sealing member is installed between the cover plate and the first end, the first sealing member is used to realize sealing between the cover plate and the main body at the location of the air outlet, a second sealing member is installed between the cover plate and the box, the second sealing member is used to realize sealing between the cover plate and the box at the location of the air outlet, a third sealing member is installed between the box and a second end of the main body, the second end is an end where an air inlet of the ventilation passage in the first direction is located, and the third sealing member is used to realize sealing between the box and the air-cooling structure at the location of the air inlet, a battery.

2. The battery according to claim 1, wherein the plurality of battery cells are installed so as to surround the air-cooling structure.

3. The battery according to claim 1, wherein the plurality of battery cells are attached to a first surface of the main body away from the ventilation passage by an adhesive for a heat-conductive structure.

4. The battery according to claim 3, wherein a contour shape of an area attached to the plurality of battery cells on the first surface matches a contour shape of a surface of the plurality of battery cells.

5. The air-cooling structure further includes a fan, and the fan is used to discharge heat generated by the plurality of battery cells by passing air through the ventilation passage, according to claim 1 described battery.

6. The box includes a first box part and a second box part including, the first box part and the second box part engage to form a receiving cavity for receiving the air-cooling structure and the plurality of battery cells, at least one of the first box part and the second box part has an opening, and a plane where the opening is located is parallel to the first direction, the battery according to claim 1.

7. A first heat dissipation part is installed on the bottom wall of the first box part, and a contour shape of a region in the first heat dissipation part that contacts the plurality of battery cells matches a contour shape of a surface of the plurality of battery cells, the battery according to claim 6.

8. A second heat dissipation part is installed on the bottom wall of the second box part, and a contour shape of a region in the second heat dissipation part that contacts the plurality of battery cells matches a contour shape of a surface of the plurality of battery cells, the battery according to claim 6.

9. The air-cooling structure is formed by a die-casting process, claim 1 the battery described.

10. In an electrical device including the battery according to any one of claims 1 to 9, the battery is used to supply electrical energy to the electrical device, the electrical device.

11. providing a plurality of cylindrical battery cells; providing an air-cooling structure including a main body and at least one ventilation passage penetrating the main body; installing the at least one ventilation passage along a first direction, the first direction being parallel to an axial direction of the plurality of battery cells, and making a cross-section of the ventilation passage perpendicular to the first direction fin-shaped; providing a box for receiving the plurality of battery cells. The air-cooling structure further includes a cover plate, the cover plate is fixedly connected to the first end of the main body, the first end is the end where the air outlet of the ventilation passage in the first direction is located, and a first sealing member is installed between the cover plate and the first end, and the first sealing member is used to realize the seal between the cover plate and the main body at the position of the air outlet. A second sealing member is installed between the cover plate and the box, and the second sealing member is used to realize the seal between the cover plate and the box at the position of the air outlet. A third sealing member is installed between the box and the second end of the main body, the second end is the end where the air inlet of the ventilation passage in the first direction is located, and the third sealing member is used to realize the seal between the box and the air-cooling structure at the position of the air inlet. A method for manufacturing a battery.

12. A first providing module for providing a plurality of cylindrical battery cells; A second providing module for providing a main body and an air-cooling structure including at least one ventilation passage passing through the main body; An assembling module for installing the at least one ventilation passage along a first direction, the first direction being parallel to the axial direction of the plurality of battery cells, and making the cross-section of the ventilation passage perpendicular to the first direction fin-shaped; And a third providing module for providing a box for accommodating the plurality of battery cells. The air-cooling structure further includes a cover plate, the cover plate is fixedly connected to the first end of the main body, the first end is the end where the air outlet of the ventilation path in the first direction is located, a first sealing member is installed between the cover plate and the first end, the first sealing member is used to realize the seal between the cover plate and the main body at the position of the air outlet, a second sealing member is installed between the cover plate and the box, the second sealing member is used to realize the seal between the cover plate and the box at the position of the air outlet, a third sealing member is installed between the box and the second end of the main body, the second end is the end where the suction port of the ventilation path in the first direction is located, and the third sealing member is used to realize the seal between the box and the air-cooling structure at the position of the suction port, a manufacturing apparatus for a battery.

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