Battery and Electrical Equipment

Abstract

The present application provides a battery (10) and an electric device having good heat dissipation performance. The battery (10) 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).

Description

[Technical field]

[0001] This application claims priority to a utility model application filed with the State Intellectual Property Office of China on January 12, 2022, application number 202220076160.4, entitled "Batteries and Electrical Devices," the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of battery technology, and in particular to batteries and electrical devices. [Background technology]

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

[0004] However, power batteries generate heat during use, which will affect the performance of the power battery and even cause serious safety issues. In order to ensure the normal use of the power battery, it is necessary to dissipate heat from the power battery. Summary of the Invention [Problem to be solved by the invention]

[0005] The present application provides a battery and an electric device with good heat dissipation performance. [Means for solving the problem]

[0006] In a first aspect, a battery is provided that includes 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 fin-shaped.

[0007] According to the technical solution, the battery adopts an air-cooling structure, which includes an air passage penetrating the body along the axial direction of the body and the battery cells, and the wind introduced into the air passage can remove the heat generated by the battery cells, and has good heat dissipation performance. In addition, the cross section of the air passage perpendicular to the first direction is fin-shaped, so that the cross section of the fin-shaped air passage combines heat dissipation efficiency and process feasibility, and increases the heat exchange area between the air-cooling structure and the battery cells, and ensures the process feasibility.

[0008] In one possible embodiment, the plurality of battery cells are arranged to surround the air-cooling structure. By arranging the plurality of cylindrical battery cells to surround the air-cooling structure, the wind introduced into the ventilation passage can effectively remove heat from each battery cell, thereby improving the overall heat dissipation efficiency.

[0009] In one possible embodiment, the plurality of battery cells are attached to a first surface of the body remote from the air passage with a thermally conductive structural adhesive.

[0010] The thermally conductive structural adhesive is used to realize the connection between the battery cells and the air-cooling structure, and since the thermally conductive structural adhesive has good thermal conductivity, the thermally conductive structural adhesive is used to surround and attach the multiple battery cells to the first surface of the ventilation passage, which is helpful in conducting the heat generated by the multiple battery cells to the ventilation passage, and further improves the heat dissipation efficiency.

[0011] In one possible embodiment, the contour shape of the area of ​​the first surface that is attached to the battery cells matches the contour shape of the surfaces of the battery cells, thereby increasing the heat dissipation area of ​​the battery cells and further improving heat dissipation efficiency.

[0012] In one possible embodiment, the air-cooling structure further includes a fan, which is used to blow air into the ventilation passage to exhaust heat generated by the battery cells. The fan can increase the air 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 including a first box portion and a second box portion, the first box portion and the second box portion engage to form a housing cavity for housing the air-cooling structure and the plurality of battery cells, at least one of the first box portion and the second box portion has an opening, and a plane in which the opening is located is parallel to the first direction.

[0014] By arranging the box so that it is formed by engaging the first box portion and the second box portion, an air-cooling structure and assembly of multiple battery cells within the box are facilitated.

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

[0016] The first heat dissipation portion may be a part of the bottom wall of the first box portion, or may be a structure provided independently facing the bottom wall of the first box portion. The first heat dissipation portion is a copy design, and the contour shape of the area of ​​the first heat dissipation portion that contacts the multiple battery cells is designed to match the contour shape of the surfaces of the multiple battery cells, thereby increasing the heat dissipation area of ​​the multiple battery cells and further improving heat dissipation efficiency.

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

[0018] The second heat dissipation portion may be a part of the bottom wall of the second box portion, or may be a structure provided independently facing the bottom wall of the second box portion. The second heat dissipation portion is a copy design, and the contour shape of the area of ​​the second heat dissipation portion that contacts the multiple battery cells is designed to match the contour shape of the surfaces of the multiple battery cells, thereby increasing the heat dissipation area of ​​the multiple 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 is simple and reliable.

[0020] In a second aspect, there is provided an electrical device including a battery according to the first aspect or any possible embodiment of the first aspect, the battery being adapted to supply electrical energy to the electrical device.

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

[0022] In a third aspect, a method for manufacturing a battery is provided, the method 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; and installing the at least one ventilation passage along a first direction X, the first direction X being parallel to an axial direction of the plurality of battery cells, and having a fin-shaped cross section perpendicular to the first direction X of the ventilation passage.

[0023] An embodiment of the present application further provides a battery manufacturing apparatus, including: 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 an assembly module for installing the at least one ventilation passage along a first direction X, the first direction X being parallel to an axial direction of the plurality of battery cells, and forming a fin-shaped cross section of the ventilation passage perpendicular to the first direction X.

[0024] In order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly introduces drawings required for the embodiments of the present application, it should be understood that the drawings shown below are only some embodiments of the present application, and those skilled in the art can further obtain other drawings based on the drawings without creative efforts. [Brief description of the drawings]

[0025] [Figure 1] 1 is a schematic structural diagram of a vehicle to which an embodiment of the present application can be applied; [Diagram 2] FIG. 2 is a schematic diagram showing the structure of a battery in an embodiment of the present application. [Diagram 3] FIG. 2 is a schematic cross-sectional view of a battery in an embodiment of the present application. [Figure 4] FIG. 2 is a schematic diagram of heat dissipation of a battery in an embodiment of the present application. [Diagram 5] FIG. 2 is a structural schematic diagram of a cover plate of the air-cooling structure of the battery in the embodiment of the present application. [Figure 6] FIG. 2 is an exploded view of a battery according to an embodiment of the present application. [Figure 7] FIG. 2 is a cross-sectional schematic diagram of a battery at an outlet according to an embodiment of the present application. [Figure 8] FIG. 2 is a cross-sectional schematic diagram of a battery at the inlet of an embodiment of the present application. [Figure 9] 1 is a schematic flow chart of a method for manufacturing a battery in an embodiment of the present application. [Figure 10] FIG. 1 is a schematic block diagram of a battery manufacturing apparatus according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0027] In the description of this application, unless otherwise stated, "multiple" means two or more, and the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", and "outer" is merely for facilitating and simplifying the description of this application, and does not indicate or imply that the subject device or element has a particular orientation, is configured and should be operated in a particular orientation, and therefore should not be understood as limiting this application. Furthermore, terms such as "first", "second", and "third" are used for explanatory purposes only, and should not be construed as indicating or implying relative importance. "Perpendicular" is not strictly perpendicular, but is within a margin of error. "Parallel" is not strictly parallel, but is within a margin of error.

[0028] Any directional expressions appearing in the following description are the directions shown in the drawings, 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 specified and limited, the terms "attach", "connect" and "connection" should be understood in a broad sense, for example, they may be fixedly connected, detachably connected, or integrally connected. They may be directly connected, or indirectly connected via an intermediate medium. Those 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 this application merely describes the relationship between related objects, and indicates that three types of relationships can exist, 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 this application, the symbol " / " generally indicates that the related objects before and after it are in an "or" relationship.

[0030] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art. The terms used in this application in the specification of the application are merely for the purpose of describing specific embodiments and are not intended to limit the present application. The terms "comprise" and "have" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or subordinate relationship.

[0031] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearances of the word in various places in this specification do not necessarily all refer to the same embodiment, nor do they refer to embodiments that are mutually exclusive, independent, or alternative to other embodiments. Those skilled in the art will understand, both explicitly and implicitly, that the embodiments described herein can be combined with other embodiments.

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

[0033] In this 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, or a magnesium ion battery, etc. The battery cell is also generally referred to as a cell. The battery cell may be cylindrical, flat, rectangular, or other regular or irregular shape. The technical solutions of the embodiments of this application can be applied to battery cells of any shape, but are particularly suitable for cylindrical battery cells and provide heat dissipation for cylindrical battery cells.

[0034] A battery as referred to in this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, a battery as referred to in this application may include a battery module or a battery pack. A battery generally includes a box for packaging one or more battery cells. The box prevents liquids or other foreign objects from affecting the charging and discharging of the battery cells.

[0035] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell is mainly operated by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is applied to the surface of the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer is called a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or 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 applied to the surface of the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer is called a 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. In order to ensure that melting does not occur due to a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly may be a wound structure or a stacked structure, and the present application is not limited thereto.

[0036] A signal transmission assembly may be further included in the battery box. The signal transmission assembly is used to transmit signals such as the voltage and / or temperature of the battery cells. The signal transmission assembly may include a bus bar for realizing an electrical connection between the multiple battery cells, for example, a parallel connection, a series connection, or a series-parallel connection. The bus bar may connect the electrode terminals of the battery cells to realize the electrical connection between 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, and a high voltage is obtained when multiple battery cells are connected in series, and accordingly, the electrical connection formed by the bus bar is also called a "high voltage connection".

[0037] Besides the busbars, the signal transmission assembly may further include sensor devices for sensing the status of the battery cells, for example, the sensor devices may be used to measure and transmit sensing signals of the battery cells' temperature, charge state, etc. In this application, the electrical connection members in the battery may include busbars and / or sensor devices.

[0038] The busbars 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 voltage and / or sensing signals of the battery cells. The signal transmission assembly does not have an insulating layer at the connection points with the electrode terminals of the battery cells, i.e., the insulating layer has an opening at the connection points with the electrode terminals of the battery cells.

[0039] The development of battery technology requires simultaneous consideration of various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, charge and discharge efficiency, etc. In addition, battery safety must also be taken into account.

[0040] Power batteries will generate heat constantly during use, and if the heat generated is too great, it will cause serious safety problems. In order to ensure the safety of power batteries, it is necessary to dissipate heat from the power batteries.

[0041] In view of this, the present application provides a technical solution by installing an air-cooling structure and arranging multiple battery cells to surround the air-cooling structure, so that the wind introduced into the ventilation duct can be effectively used to remove heat from the battery cells, and good heat dissipation performance is achieved.

[0042] The technical solutions described in this application are applicable to various electric devices using batteries, such as vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys, electric tools, etc. The vehicles can be gasoline vehicles, natural gas vehicles or new energy vehicles, and the new energy vehicles can be pure electric vehicles, hybrid vehicles or range extender vehicles, etc. The spacecraft include aircraft, rockets, space shuttles and spaceships, etc. The electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric aircraft toys. The electric tools include metal cutting electric tools, polishing electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators and electric planers.

[0043] For convenience of explanation, the electrical equipment will be explained below using a vehicle as an example.

[0044] For example, FIG. 1 shows a structural schematic diagram of a vehicle 1 to which the embodiments of the present application can be applied, and the vehicle 1 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. A motor 40, a controller 80, and a battery 10 may be installed inside the vehicle 1, and the controller 80 is used to control the battery 10 to power the motor 40. For example, the battery 10 may be installed at the bottom, front, or rear of the vehicle 1. The battery 10 is used to power the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, to meet the needs of the vehicle 1 for starting, navigating, and running. In some embodiments, the battery 10 may be used not only as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or partially replacing fuel or natural gas to provide driving power to the vehicle 1.

[0045] In order to meet various power demands, the battery 10 may include multiple battery cells, for example multiple cylindrical battery cells. Here, the multiple battery cells may be connected in series, in parallel, or in series-parallel, and the series-parallel connection refers to a mixture of the series and parallel connections. The battery may also be called a battery pack. In some embodiments, multiple battery cells may be first connected in series, in parallel, or in series-parallel to form a battery module, and the multiple battery modules may be further connected in series, in parallel, or in series-parallel to form the battery 10. That is, the multiple battery cells may directly form the battery 10, or a battery module may be first formed, and the battery module may then form the battery 10.

[0046] For example, FIG. 2 shows a structural schematic diagram of a battery 10 in an 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 (or called a cover), the inside of the box 11 is 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 respectively referred to herein as a first box part 111 and a second box part 112, and the first box part 111 and the second box part 112 are engaged together. The shapes of the first box part 111 and the second box part 112 are determined by the combined shape of the plurality of battery cells 20, and at least one of the first box part 111 and the second box part 112 has an opening. For example, the first box portion 111 and the second box portion 112 may each be a hollow rectangular parallelepiped with only one surface being an open surface, the opening of the first box portion 111 and the opening of the second box portion 112 may be disposed opposite each other, and the first box portion 111 and the second box portion 112 may be engaged with each other to form a box 11 having a closed cavity. First Box Section 111 and Second box section 112 Only one of the battery cells 20 may be a hollow rectangular parallelepiped having an opening, and the other may be a plate-like shape that covers the opening. The number of the battery cells 20 may be set to any number according to the demand for power. The multiple battery cells 20 may be connected in series, parallel, or series-parallel connection to achieve larger capacity or power. After the multiple battery cells 20 are combined in parallel, series, or series-parallel connection, they are placed in the box 11 formed by engaging the first box portion 111 and the second box portion 112.

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

[0048] For ease of explanation, the following description will be mainly based on the cylindrical battery cell 20 shown in FIG.

[0049] 3 is a structural schematic diagram of a battery 10 in an embodiment of the present application. As shown in Fig. 2 and Fig. 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 multiple 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 wind is introduced into the ventilation passage 32, the wind can remove heat generated in 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, and the larger the cross-sectional area of ​​the ventilation passage 32, the higher the heat dissipation efficiency, but the more complicated the manufacturing process becomes. The cross-sectional shape of the ventilation passage 32 can be optimized, for example, by a method such as thermal simulation, while ensuring the feasibility of the process.

[0052] In an embodiment of the present application, a cross-section perpendicular to the first direction X of the ventilation passage 32 is fin-shaped. In the air-cooled structure 30 formed by adopting a die-casting process, by adopting a fin-shaped cross-section of the ventilation passage, 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 cell 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, and the process is simple and highly reliable.

[0054] The present application does not limit the number and position of the ventilation passages 32. In FIG. 3, 10 ventilation passages are taken as an example, and the 10 ventilation passages 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 passage 32 is fin-shaped. For example, among the 10 ventilation passages arranged along the second direction Y in FIG. 3, the fin shape of the 3 ventilation passages 32 located on the leftmost side and the 3 ventilation passages 32 located on the rightmost side may be similar to the shape of the letter "E" in the alphabet. As another example, among the 10 ventilation passages arranged along the second direction in FIG. 3, the fin shape of the 4 ventilation passages 32 located in the middle may be similar to the shape of the character "king" formed by putting two "E"s back to back.

[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 passage 32 that penetrates the main body 31 along the axial direction of the battery cell 20, that is, the first direction X. The heat generated by the plurality of battery cells 20 can be taken away by the wind introduced into the ventilation passage 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 passage 32 is fin-shaped, such a fin-shaped cross-section of the ventilation passage has both heat dissipation efficiency and process feasibility. It not only increases the heat exchange area between the air-cooled structure and the battery cell, but also can guarantee the feasibility of the process.

[0056] FIG. 3 shows the location of a Printed Circuit Board Assembly (PCBA) 201 of a Battery Management System (BMS) in box 11, although for the sake of brevity and clarity, its specific structure is not shown in FIG. 3.

[0057] 2 and 3, in one embodiment, the multiple battery cells 20 are arranged to surround the air-cooling structure 30. By arranging the multiple cylindrical battery cells 20 to surround the air-cooling structure 30, the wind introduced into the ventilation passage 32 can effectively remove heat from each battery cell 20, improving the overall heat dissipation efficiency.

[0058] 2 and 3 , in one implementation, the battery 10 further includes a box 11, the box 11 including a first box part 111 and a second box part 112, the first box part 111 and the second box part 112 engage with each other to form a receiving cavity for receiving the air-cooling structure 30 and the plurality of battery cells 20, at least one of the first box part 111 and the second box part 112 has an opening, and a plane in which the opening is located is parallel to the first direction X. By installing the box 11 so as to be formed by engaging the first box part 111 and the second box part 112, the air-cooling structure 30 and the plurality of battery cells 20 can be easily assembled in the box 11.

[0059] Since the multiple battery cells 20 are accommodated in a storage 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 to dissipate heat from the multiple battery cells 20.

[0060] For example, a first heat dissipation section 1110 is installed on the bottom wall of the first box section 111 , and the contour shape of the area of ​​the first heat dissipation section 1110 that comes into contact with the multiple battery cells 20 matches the contour shape of the surfaces of the multiple battery cells 20 .

[0061] Here, the first heat dissipation part 1110 is a copy design, and the contour shape of the area where it contacts the multiple battery cells 20 is designed to match the contour shape of the surface of the multiple 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 provided independently 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 area on the surface of the heat conduction plate that contacts the multiple battery cells 20 is arc-shaped, and the curvature of the arc is the same as the curvature of the arc at a position corresponding to the surface of the battery cell 20. This increases the heat dissipation area of ​​the battery cell 20. The black dashed arrows in Figure 4 indicate the heat dissipation direction of the multiple battery cells 20, and heat emitted by the other battery cells 20 other than the battery cells 20 located at both ends in the second direction Y is not only removed by the wind introduced into the ventilation passage 32, but also by the bottom wall of the first box portion 111, further improving the heat dissipation efficiency.

[0062] As another example, the second heat dissipation section 1120 is installed on the bottom wall of the second box section 112 , and the contour shape of the area of ​​the second heat dissipation section 1120 that contacts the multiple battery cells 20 matches the contour shape of the surfaces of the multiple battery cells 20 .

[0063] Here, the second heat dissipation portion 1120 is a copy design, and the contour shape of the region where it contacts the multiple battery cells 20 is designed to match the contour shape of the surface of the multiple battery cells 20. The second heat dissipation portion 1120 may be a 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 opposite to 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 cell 20 to form the second heat dissipation portion 1120. The contour of the region of the second heat dissipation portion 1120 where it contacts the multiple battery cells 20 is arc-shaped, and the curvature of the arc is the same as the curvature of the arc at a position corresponding to the surface of the battery cell 20, thereby increasing the heat dissipation area of ​​the battery cell 20. The black dashed arrows in Figure 4 indicate the heat dissipation direction of the multiple battery cells 20, and heat emitted by the other battery cells 20 other than the battery cells 20 located at both ends in the second direction Y is not only removed by the wind introduced into the ventilation passage 32, but also by the bottom wall of the second box portion 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 passages 32 by a thermally conductive structural adhesive 34 .

[0065] The thermally conductive structural adhesive 34 is used to realize the connection between the battery cells 20 and the air-cooling structure 30. Furthermore, since the thermally conductive structural adhesive 34 has good thermal conductivity, by attaching the multiple battery cells 20 to the first surface 313 of the ventilation passage 32 with the thermally conductive structural adhesive 34, it is helpful in conducting the heat generated by the multiple battery cells 20 to the ventilation passage 32, and further improves the heat dissipation efficiency.

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

[0067] For example, as shown in Figures 3 to 5, the contour of the area on the first surface 313 of the main body 31 that is attached to the multiple battery cells 20 is arc-shaped, and the curvature of the arc is the same as the curvature of the arc at a position corresponding to the surface of the battery cell 20, thereby increasing the contact area between the battery cell 20 and the first surface 313, increasing the heat dissipation area of ​​the multiple battery cells 20, and further improving the heat dissipation efficiency.

[0068] In one embodiment, as shown in FIG. 3 to FIG. 5, a weight reduction groove is provided in an area of ​​the first surface 313 of the body 31 that is not attached to the plurality of battery cells 20. 314 is provided.

[0069] The main body 31 of the air-cooling structure 30 is generally made of a metal material such as aluminum and is heavy. Therefore, weight-reducing grooves are provided in the non-heat dissipation area of ​​the main body 31 that does not come into contact with the battery cells 20. 314 By providing the weight reduction groove, the weight of the air-cooling structure 30 can be reduced. 314 The number and size of the weight-reducing grooves are not limited, and eight weight-reducing grooves are shown in FIGS.

[0070] In one implementation, the air-cooling structure 30 further includes a cover plate 33. Here, the cover plate 33 and the main body 31 and a first end 311 of the air-cooling structure 30 via a first bolt 41. The first end 311 is an end where the outlet of the air passage 32 in the first direction X is located, and is also called the rear 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 a box 11. 30A cover plate 33 is installed at the end where the air outlet of the battery 10 is located, and the cover plate 33 and the body 31 of the air-cooling structure 30 are assembled together via a first bolt 41. The air-cooling structure 30 and the plurality of battery cells 20 are connected with a thermally conductive structural adhesive 34 to form a module, and then the module is inserted into the box 11 through the opening of the second box portion 112, and the cover plate 33 is fixed to the first end 311 of the body 31 via the first bolt 41. This not only meets the requirements for assembling the battery 10, but also provides a reliable connection between the air-cooling structure 30 and the plurality of battery cells 20. box Assembly can be achieved within the battery pack 11, and the multiple battery cells 20 can be sealed by a cover plate 33.

[0072] 7, a first sealing member 51 is installed between the cover plate 33 and the first end 311 of the body 31. The first sealing member 51 can realize a seal between the cover plate 33 and the body 31 at the outlet, place the battery cell 20 in a sealed space, and ensure the airtightness requirement of the battery cell 20.

[0073] In one implementation, 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 can realize a seal between the cover plate 33 and the box 11 at the outlet, place the battery cell 20 in a sealed space, and ensure the airtightness requirement of the battery cell 20.

[0074] As can be seen from the above, the first seal member 51 seals the gap between the cover plate 33 and the air-cooling structure 30 at the air outlet, and the second seal member 52 seals the gap between the cover plate 33 and the air-cooling structure 30 at the air outlet. box By sealing between the box 11 and the cover plate 33, multiple battery cells 20 are installed around the air-cooling structure 30 and then placed in the sealed space formed by the box 11, the cover plate 33 and the air-cooling structure 30, thereby ensuring the airtightness requirements of the battery cells 20.

[0075] 7, there is a gap 60 between the cover plate 33 and the end faces of the multiple 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 enough space for automatic assembly of the battery 10.

[0076] In one implementation, the body of the air-cooling structure 30 31 The second end 312 of the air passage 32 and the box 11 are fixed to each other via a second bolt 42. Here, the second end 312 is an end where the intake port of the air passage 32 in the first direction X is located, and is also called the front part of the air-cooling structure.

[0077] 6 and 8, the air-cooling structure 30 and the multiple battery cells 20 are housed in the box 11, and the box 11 and the main body 31 of the air-cooling structure 30 are assembled together via the second bolts 42. The air-cooling structure 30 and the multiple battery cells 20 are connected with a thermally conductive structural adhesive 34 to form a module, and then the module is inserted into the box 11 through the opening of the second box portion 112, and the second end 312 of the main body 31 is fixed to the box 11 via the second bolts 42. This not only meets the requirements for assembling the battery 10, but also improves the reliability of the air-cooling structure 30 and the multiple battery cells 20. box 11, and furthermore, the sealing of the plurality of battery cells 20 can be achieved.

[0078] 8 , a third sealing member 53 is installed between the second end 312 of the body 31 and the box 11. The third sealing member 53 can realize a seal between the box 11 and the air-cooling structure 30 at the suction port, so that the battery cells 20 are placed in a sealed space and the airtightness requirements of the battery cells 20 are guaranteed.

[0079] In one embodiment, the air-cooling structure 30 further includes a fan 70, which is used to blow air into the ventilation passage 32 to dissipate heat generated by the multiple battery cells 20. The fan 70 can increase the air speed in the ventilation passage 32 and improve the heat dissipation efficiency of the battery cells 20.

[0080] As shown in FIG. 8 , a fan 70 is installed at the air intake. The fan 70 is, for example, an axial fan, and is used to generate cool air along a first direction X. When the cool air passes through the ventilation passage 32, the heat generated by the battery cells 20 is discharged from inside the battery 10, thereby lowering the temperature of the battery 10.

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

[0082] The battery 10 of the embodiment is installed in an electrical device, and in the battery 10, a plurality of cylindrical battery cells 20 are installed to surround an air-cooling structure 30, and the air-cooling structure 30 includes a main body 31 and an air passage 32 that penetrates the main body 31 along the axial direction of the battery cells, i.e., a first direction X; ventilation duct 32 The air introduced into the battery 10 can remove the heat generated by the multiple battery cells 20, resulting in good heat dissipation performance and high safety for the battery 10, which is beneficial for the widespread use and use of electrical equipment.

[0083] The above describes the battery 10 and the electric device 1 according to the embodiment of the present application. Below, a manufacturing method 300 and a manufacturing apparatus 400 for the battery 10 according to the embodiment of the present application will be described. For parts that are not described in detail here, please refer to the above embodiments.

[0084] Fig. 9 shows a schematic flow chart of a manufacturing method 300 of a 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 arranging the at least one ventilation passage 32 along a first direction X, the first direction X being parallel to the axial direction of the plurality of battery cells 20, and forming a cross section of the ventilation passage 32 perpendicular to the first direction X into a fin shape.

[0085] Fig. 10 is a schematic block diagram of a manufacturing apparatus 400 for a 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 assembly module 430 for installing the at least one ventilation passage 32 along a first direction X, the first direction X being parallel to the axial direction of the plurality of battery cells 20, and forming a fin-shaped cross section of the ventilation passage 32 perpendicular to the first direction X.

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

[0087] 1 vehicle 10 batteries 11 Box 20 Battery Cells 30 Air cooling structure 31 Main unit 32 Ventilation duct 33 Cover plate 34 Thermally conductive structural adhesives 40 Motor 41 First Bolt 42 Second Bolt 51 First seal member 52 Second seal member 53 Third seal member 60 Gap 70 Fans 80 Controller 111 Box 1 112 2nd Box Section 201 Printed Circuit Board Assembly 311 First end 312 Second end 313 1st surface 314 Weight Reduction Groove 400 Manufacturing equipment 410 First Offering Module 420 Secondary Offering Module 430 Assembly Module 1110 1st heat dissipation section 1120 2nd heat dissipation section

Claims

1. A plurality of cylindrical battery cells (20); an air-cooling structure (30) including 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 an axial direction of the plurality of battery cells (20), and a cross section of the ventilation passage (32) perpendicular to the first direction (X) being fin-shaped; A battery (10), comprising:

2. The battery (10) of claim 1, wherein the plurality of battery cells (20) are arranged to surround the air-cooling structure (30).

3. The battery (10) of claim 1 or 2, characterized in that 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).

4. The battery (10) of claim 3, wherein the contour shape of the area of ​​the first surface (313) attached to the plurality of battery cells (20) matches the contour shape of the surfaces of the plurality of battery cells (20).

5. The battery (10) according to any one of claims 1 to 4, characterized in that the air-cooling structure (30) further includes a fan (70), the fan (70) being used to blow air through the ventilation passage (32) to dissipate heat generated by the plurality of battery cells (20).

6. The battery (10) according to any one of claims 1 to 5, further comprising a box (11), the box (11) comprising a first box portion (111) and a second box portion (112), the first box portion (111) and the second box portion (112) engaging with each other to form an accommodating cavity for accommodating the air-cooling structure (30) and the plurality of battery cells (20), at least one of the first box portion (111) and the second box portion (112) having an opening, and a plane in which the opening is located is parallel to the first direction (X).

7. The battery (10) described in claim 6, characterized in that a first heat dissipation section (1110) is installed on the bottom wall of the first box section (111), and the contour shape of the area of ​​the first heat dissipation section (1110) that contacts the multiple battery cells (20) matches the contour shape of the surfaces of the multiple battery cells (20).

8. The battery (10) of claim 6 or 7, characterized in that a second heat dissipation section (1120) is installed on the bottom wall of the second box section (112), and the contour shape of the area of ​​the second heat dissipation section (1120) that contacts the multiple battery cells (20) matches the contour shape of the surfaces of the multiple battery cells (20).

9. The battery (10) according to any one of claims 1 to 8, characterized in that the air-cooling structure (30) is formed by a die casting process.

10. An electrical device comprising a battery (10) according to any one of claims 1 to 9, characterized in that the battery (10) is used to supply electrical energy to the electrical device.

11. Providing a plurality of battery cells (20) having a cylindrical shape; providing an air-cooling structure (30) including a body (31) and at least one air passage (32) passing through the body (31); a step of installing at least one of the ventilation passages (32) along a first direction (X), the first direction (X) being parallel to an axial direction of the plurality of battery cells (20), and forming a cross section of the ventilation passage (32) perpendicular to the first direction (X) into a fin shape; A method (300) for manufacturing a battery (10) comprising:

12. 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 body (31) and at least one air passage (32) passing through the body (31); an assembly module (430) for installing at least one of the ventilation passages (32) along a first direction (X), the first direction (X) being parallel to the axial direction of the plurality of battery cells (20), and for forming a fin-shaped cross section of the ventilation passage (32) perpendicular to the first direction (X); A manufacturing apparatus (400) for a battery (10) comprising:

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