Battery cell case assembly, battery cell, battery and power consumption device

Abstract

A battery cell case assembly, a battery cell, a battery, and an electric power consuming device, which belong to the field of battery cell technology. The battery cell case assembly includes a case body and a case lid. The case body has an opening, the case lid is provided at the opening, and the mutually fitting surfaces of the case lid and the case body have rough regions.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and specifically, to a case assembly of a battery cell, a battery cell, a battery, and an electric power consumption device.

Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries play an irreplaceable and important role as the power source of electric vehicles. A battery consists of a box and a plurality of batteries housed in the box. Here, as a core component of new energy vehicles, the battery has high requirements in terms of safety and service life. However, the pressure resistance of the case of the battery cell in the battery is weak, and a large amount of heat is generated during the process of continuous charging and discharging, causing the battery cell to expand due to heat and the case to be damaged, which in turn affects the use performance and service life of the battery.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Embodiments of the present application provide a case assembly of a battery cell, a battery cell, a battery, and an electric power consumption device that can effectively improve the pressure resistance performance and airtightness of the case assembly.

Means for Solving the Problems

[0004] In a first aspect, embodiments of the present application provide a case assembly of a battery cell including a case body and a case lid. The case body has an opening, the case lid is provided at the opening, and the mating surfaces of the case lid and the case body have rough areas.

[0005] In the above technical solution, by providing a rough area on the mating surfaces of the case cover and the case body, the frictional force between the case cover and the case body can be increased. When the internal pressure of the case assembly increases, the deformation and slippage of the case cover can be suppressed by utilizing the frictional force, and the firmness of the fit between the case cover and the case body can be improved. Thereby, the pressure resistance capacity of the case assembly can be enhanced, and the airtightness of the case assembly can be effectively improved. Furthermore, a thick seal structure member for airtightness and pressure resistance can be omitted, and space can be saved and the energy density of the battery cell can be improved.

[0006] In some embodiments, the rough area includes a first area provided on the case body, and the roughness of the first area is greater than the roughness of the area of the case body other than the first area.

[0007] In the above technical solution, the roughness of the first area is greater than the roughness of the area of the case body other than the first area. By increasing the local roughness of the case body, the firmness of the fit between the case body and the case cover can be improved.

[0008] In some embodiments, a seal member is provided between the case cover and the case body, and the first area is located at a position facing the seal member of the case body.

[0009] In the above technical solution, a seal member is provided between the case cover and the case body, and the first area is located at a position facing the seal member of the case body. Thereby, the frictional force between the case body and the seal member can be increased, the case body and the seal member are not prone to slipping, and the sealing performance of the case assembly can be increased.

[0010] In some embodiments, the rough area includes a second area provided on the case cover, and the roughness of the second area is greater than the roughness of the area of the case cover other than the second area.

[0011] In the above technical solution, the roughness of the second region of the case cover is greater than the roughness of the regions other than the second region of the case cover. By increasing the local roughness of the case cover, the firmness of the fit between the case cover and the case body can be improved.

[0012] In some embodiments, a sealing member is provided between the case cover and the case body, and the second region is located at a position facing the sealing member of the case cover.

[0013] In the above technical solution, by providing a sealing member between the case cover and the case body and the second region being at a position facing the sealing member of the case cover, the frictional force between the case cover and the sealing member can be increased, the case cover and the sealing member are not easy to slip, and the sealing performance of the case assembly can be increased.

[0014] In some embodiments, the case body includes a peripheral wall portion and an end wall portion. The end wall portion is connected to the axial end of the peripheral wall portion and abuts against the outer side in the axial direction of the outer edge portion of the case cover, and the rough region is between the end wall portion and the outer edge portion.

[0015] In the above technical solution, the end wall portion of the case body abuts against the outer side in the axial direction of the outer edge portion of the case cover, and the rough region is between the end wall portion and the outer edge portion, so that the frictional force between the end wall portion and the outer edge portion can be increased, the slipping between the end wall portion and the outer edge portion can be suppressed, and further, the pressure resistance strength of the case assembly can be enhanced, and at the same time, the attachment between the case body and the case cover can be made simple and firm.

[0016] In some embodiments, the rough region includes a first region on the inner surface of the end wall portion and / or a second region on the outer surface of the outer edge portion.

[0017] In the above technical solution, the rough area includes a first area on the inner surface of the end wall portion or a second area on the outer surface of the outer edge portion, both of which increase the frictional force between the end wall portion and the outer edge portion, suppress the slippage between the end wall portion and the outer edge portion, and further enhance the pressure resistance of the case assembly. The rough area includes a first area on the inner surface of the end wall portion and a second area on the outer surface of the outer edge portion. Roughening both the end wall portion and the outer edge portion has a better effect of increasing the frictional force than roughening only one of them, and can further enhance the pressure resistance of the case assembly.

[0018] In some embodiments, a sealing member is provided between the end wall portion and the outer edge portion.

[0019] In the above technical solution, by providing a sealing member between the end wall portion and the outer edge portion, the frictional force between the end wall portion and the sealing member or between the outer edge portion and the sealing member can be increased, or the frictional force among the end wall portion, the outer edge portion, and the sealing member can be increased simultaneously, thereby improving the sealing effect of the case assembly.

[0020] In some embodiments, the case lid further includes a protruding portion, the outer edge portion is provided surrounding the protruding portion, and the protruding portion protrudes outward with respect to the outer edge portion and extends into the inner ring area of the end wall portion.

[0021] In the above technical solution, the case lid further includes a protruding portion, the outer edge portion is provided surrounding the protruding portion, the protruding portion protrudes outward in a direction away from the center of the case body with respect to the outer edge portion and extends into the inner ring area of the end wall portion. The protruding portion can increase the expansion space of the battery cell case and further enhance the pressure resistance of the battery cell case.

[0022] In some embodiments, an explosion-proof pressure relief structure is provided on the protruding portion.

[0023] In the above technical solution, the installation of the protruding portion is advantageous for the explosion-proof pressure relief structure to achieve a reliable explosion-proof pressure relief effect.

[0024] In some embodiments, the peripheral wall portion has an inwardly convex portion, and the inwardly convex portion protrudes along the radial direction of the case body and abuts against the inner side in the axial direction of the outer edge portion.

[0025] In the above technical solution, the peripheral wall portion of the case body has an inwardly convex portion, and the inwardly convex portion protrudes along the radial direction of the case body and abuts against the inner side in the axial direction of the outer edge portion. In this way, the frictional force between the case body and the case lid increases, making it difficult for the case lid to be pushed out by expansion, and the connection between the case body and the case lid becomes stronger.

[0026] In some embodiments, the case body forms an end wall portion by a cold head process.

[0027] In the above technical solution, the case body forms an end wall portion by a cold head process, the manufacturing process is simple, and there is no bad heat influence.

[0028] In some embodiments, an intermediate member is provided between the mating positions of the case body and the case lid, and sealing members are respectively provided between the intermediate member and the case body and between the intermediate member and the case lid. The rough area includes a third area provided on the intermediate member, the third area is provided facing the sealing member, and the roughness of the third area is greater than the roughness of the outer surface of the case body and / or the inner surface of the case lid.

[0029] In the above technical solution, an intermediate member is provided between the mating positions of the case body and the case lid, and sealing members are respectively provided between the intermediate member and the case body and between the intermediate member and the case lid. The rough area includes a third area provided on the intermediate member, the third area is provided facing the sealing member, and the roughness of the third area is greater than the roughness of the outer surface of the case body and / or the inner surface of the case lid. By providing the intermediate member, the intermediate member can be directly roughened. When the case body and the case lid are not roughened, the manufacturing process of the case body and the case lid can be simplified. Of course, the case body and the case lid can also be roughened simultaneously.

[0030] In some embodiments, the sealing member is a plastic sealing material.

[0031] In the above embodiment, the sealing member is a plastic sealing material. The plastic sealing material has good sealing performance, good manufacturability, low cost, can enhance the firmness of the fitting between the case body and the case cover, and can save space.

[0032] In a second aspect, a battery cell is provided that includes an electrode assembly and the above-described case assembly of the battery cell, and the electrode assembly is provided within the case assembly.

[0033] In a third aspect, a battery is provided that includes a plurality of the above-described battery cells.

[0034] In a fourth aspect, a power consumption device is provided that includes the above-described battery.

[0035] To more clearly explain the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application are briefly described below. It is clear that the drawings described below are only some embodiments of the present application and do not limit the scope. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

Brief Description of the Drawings

[0036]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0037] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, hereinafter, in combination with the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. The described embodiments are not all the embodiments of the present application, but some embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope protected by the present application.

[0038] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the art of the present application. The terms used in the specification of the present application are for the purpose of explaining specific embodiments only and are not intended to limit the present application. The terms "comprising", "having" and any variations thereof in the specification, claims and description of the foregoing drawings of the present application mean covering non-exclusive inclusion. The terms "first", "second", etc. in the specification, claims or description of the foregoing drawings of the present application are for distinguishing different objects and are not used to explain a specific order or priority.

[0039] In the present application, referring to "embodiment" means that a specific feature, structure or characteristic described in combination with the embodiment can be included in at least one embodiment of the present application. When this word appears in each place in the specification, it does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0040] In the description of the present application, unless otherwise specifically defined and limited, terms such as "attach", "connect to each other", "connect", and "adhere" may, for example, be fixedly connected, removably connected or integrally connected, directly connected to each other, or connected to each other through an intermediate medium, and should be understood in a broad sense. Those skilled in the art can understand the specific concepts of the above technical terms in the present application according to specific situations.

[0041] The term "and / or" in the present application is merely a relationship for explaining related objects, indicating that three relationships may exist. For example, A and / or B can indicate three cases: when A exists alone, when A and B exist simultaneously, and when B exists alone. Also, it should be understood that the character " / " in the text generally indicates that the related objects before and after are in an "or" relationship.

[0042] In the embodiments of the present application, the same reference numerals denote the same components, and for the sake of brevity, the detailed description of the same components in different embodiments is omitted. It should be understood that the dimensions such as the thickness, length, and width of various members in the embodiments of the present application shown in the drawings, and the dimensions such as the overall thickness and width of the integrated device are merely illustrative explanations and do not constitute limitations of the present application.

[0043] The "plurality" appearing in the present application means two or more, including two.

[0044] In the present application, the battery cell can include a primary battery or a secondary battery, and can also include a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., but the embodiments of the present application are not limited thereto. The battery cell can have a cylindrical shape, a flat shape, a cuboid shape, or other shapes, but the embodiments of the present application are not limited thereto. The battery cell is generally classified into three types: a cylindrical battery cell, a prismatic battery cell, and a soft-pack battery cell by the packaging method, and the embodiments of the present application are not limited thereto.

[0045] As used in the embodiments of the present application, the battery refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module, a battery pack, etc. The battery generally includes a box for packaging one or more battery cells or a plurality of battery modules. The box can prevent liquids and other foreign substances from affecting the charging or discharging of the battery cells. Alternatively, the battery of the present application may not include the above box, which will not be repeatedly described herein.

[0046] A battery cell includes a housing, an electrode assembly, and an electrolyte. The housing is used to accommodate the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode sheet and a negative electrode sheet. The battery cell mainly operates 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 protruding from the positive electrode current collector coated with the positive electrode active material layer is taken 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 protruding from the negative electrode current collector coated with the negative electrode active material layer is taken 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. In order to ensure that a large current can pass through without fusing, the number of positive electrode tabs is plural and laminated, and the number of negative electrode tabs is plural and laminated.

[0047] The battery cell includes a partition member, which may be a separator, and the material of the separator may be polypropylene or polyethylene, etc. Note that the electrode assembly may have a wound structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0048] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, the power battery plays an irreplaceable and important role as the power source of the electric vehicle. As a core component of new energy vehicles, the battery has high requirements in terms of safety and service life.

[0049] The inventor has discovered that in a general power battery, in order to obtain sufficient power for the battery, usually, a plurality of battery cells of the battery are stacked side by side. However, during the process of continuous charging and discharging of the battery cell, a large amount of heat is generated, the internal temperature of the battery cell rises, and such a phenomenon is worsened by the structure in which a plurality of battery cells are stacked, the pressure resistance capacity of the case of the battery cell is weak, the inside of the battery cell expands due to heat and the case of the battery cell is damaged, which in turn affects the use performance and service life of the battery cell.

[0050] Based on the above considerations, in order to solve the problem that the pressure resistance capacity of the case of the battery cell is weak, as a result of intensive research, the inventor has designed a case assembly for the battery cell. The case assembly includes a case body and a case cover. The case cover covers the case body. By providing a rough area on the mutually fitting surfaces of the case cover and the case body, the frictional force between the case cover and the case body can be increased. When the internal pressure of the case assembly increases, the frictional force increases accordingly, effectively suppressing the deformation and slippage of the case cover, improving the fitting firmness between the case cover and the case body, enhancing the airtightness of the entire case assembly and the pressure resistance capacity of the case assembly, avoiding the damage of the case assembly due to the expansion of the battery cell, and improving the safety and service life of the battery cell.

[0051] Also, by providing a rough area, both the pressure resistance and airtightness of the case assembly are improved. For this reason, in some embodiments, the seal ring structure can be omitted compared to the prior art, improving the packaging speed, enhancing the packaging efficiency, and reducing the production cost. On the other hand, the occupied space of the seal ring structure is saved, thereby increasing the effective volume within the case assembly, further ensuring the pressure resistance performance, and at the same time improving the energy density of the battery cell.

[0052] The battery disclosed in the embodiments of the present application can be used in power-consuming devices such as vehicles, ships, or aircraft, but is not limited thereto. The power supply system of the power-consuming device can be configured using the battery and the like disclosed in the present application. Thus, it is advantageous for expanding the application range of the battery.

[0053] The embodiments of the present application provide a power-consuming device that uses a battery as a power source. Examples of the power-consuming device include mobile phones, tablets, notebook computers, electric toys, electric tools, battery cars, electric vehicles, steamships, spacecraft, and the like. The electric toys can include fixed or mobile electric toys such as game machines, electric vehicle toys, electric steamship toys, and electric airplane toys. The spacecraft can include airplanes, rockets, space shuttles, spaceships, and the like.

[0054] In the following embodiments, for the sake of convenience of explanation, a vehicle, which is a power-consuming device according to an embodiment of the present application, will be described as an example.

[0055] Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a vehicle 10000 according to some embodiments of the present application. The vehicle 10000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 1000 is provided inside the vehicle 10000, and the battery 1000 can be provided at the bottom, the head, or the tail of the vehicle 10000. The battery 1000 can be used for power supply of the vehicle 10000. For example, the battery 1000 can be used as the operating power source of the vehicle 10000. The vehicle 10000 may further include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery 1000 to supply power to the motor 3000. For example, it is used for the operating power requirements during the startup, navigation, and driving of the vehicle 10000.

[0056] In some embodiments of the present application, the battery 1000 may not only be used as the operating power source of the vehicle 10000, but also as the driving power source of the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0057] Please refer to FIG. 2. FIG. 2 is an exploded view of the structure of battery 1000 according to some embodiments of the present application. The battery 1000 includes a box 200 and a plurality of battery cells 100, and the battery cells 100 are housed in the box 200. The box 200 is used to provide an assembly space for the battery cells 100 and can adopt various structures. In some embodiments, the box 200 can include a first box body 201 and a second box body 202. The first box body 201 and the second box body 202 are lid-joined to each other, and both the first box body 201 and the second box body 202 define an assembly space for housing the battery cells 100. The second box body 202 may have a hollow structure with one end open, the first box body 201 may have a plate-like structure, and the first box body 201 is lid-joined to the open side of the second box body 202 so that the first box body 201 and the second box body 202 together define an assembly space. Both the first box body 201 and the second box body 202 may have a hollow structure with one side open, and the open side of the first box body 201 is lid-joined to the open side of the second box body 202. Of course, the box 200 formed by the first box body 201 and the second box body 202 may have various shapes such as a cylinder or a cuboid.

[0058] In the battery 1000, the plurality of battery cells 100 may be connected in series, in parallel, or in a mixed connection. The mixed connection means that both series connection and parallel connection are present in the plurality of battery cells 100. The plurality of battery cells 100 are directly connected in series, in parallel, or in a mixed connection, and the whole composed of the plurality of battery cells 100 may be housed in the box 200. Of course, the battery 1000 may be formed by connecting a plurality of battery modules in series, in parallel, or in a mixed connection after the plurality of battery cells 100 are connected in series, in parallel, or in a mixed connection to form a battery module, and then housed in the box 200. The battery 1000 may further include other structures, for example, a busbar member for realizing electrical connection between the plurality of battery cells 100.

[0059] In the following embodiments, for the sake of convenience of explanation, the case assembly 30 of the battery cell 100 according to an embodiment of the present application will be described as an example.

[0060] Please refer to FIGS. 3 and 4. FIG. 3 is a schematic structural diagram of the case assembly 30 of the battery cell 100 according to some embodiments of the present application. The case assembly 30 includes a case body 10 and a case lid 11. The case body 10 has an opening 104, and the case lid 11 is provided at the opening 104 and is used to close the opening 104.

[0061] The surfaces of the case lid 11 and the case body 10 that fit with each other have a rough area 20. The rough area 20 can increase the frictional force between the case lid 11 and the case body 10. When the internal pressure of the case assembly 30 increases, the frictional force increases accordingly, effectively suppressing the deformation and slippage of the case lid 11, improving the firmness of the fit between the case lid 11 and the case body 10, enhancing the airtightness of the entire case assembly 30 and the pressure resistance of the case assembly 30, avoiding the damage of the case assembly 30 due to the expansion of the battery cell 100, and improving the safety and service life of the battery cell 100.

[0062] Also, by providing the rough area 20, both the pressure resistance and airtightness of the case assembly 30 are improved. Therefore, in some embodiments, compared with the prior art, the sealing ring structure can be omitted, the packaging speed can be improved, the packaging efficiency can be increased, and the production cost can be reduced. On the other hand, the occupied space of the sealing ring structure is saved, thereby increasing the effective volume in the case assembly 30, ensuring the pressure resistance performance, and at the same time improving the energy density of the battery cell 100.

[0063] Of course, the present application is not limited thereto. In other embodiments of the present application, if there is sufficient space, a sealing ring structure may be provided, and it is not limited here.

[0064] It should be understood in a broad sense that the rough area 20 is located on the mating surfaces of the case lid 11 and the case body 10, that is, the rough area 20 is located at the mating position and on the mating surface of the case lid 11 and the case body 10, but it is not limited to which part's surface it is provided on. For example, the rough area 20 may be provided on the case lid 11, on the case body 10, or on other parts between the case lid 11 and the case body 10, and is not limited here. However, as long as the rough area 20 is provided on the mating position and on the mating surface of the case lid 11 and the case body 10, the frictional force between the case lid 11 and the case body 10 can be increased, and further the firmness of the fit between the case lid 11 and the case body 10 can be improved, and the pressure resistance capacity of the case assembly 30 can be enhanced.

[0065] In some embodiments, please refer to FIGS. 3 and 4. The rough area 20 includes a first area 13 provided on the case body 10, and the roughness of the first area 13 is greater than the roughness of the areas of the case body 10 other than the first area 13. Thereby, by increasing the local roughness of the case body 10, the firmness of the fit between the case lid 11 and the case body 10 is improved, and it is convenient for the roughening process, shortening the roughening process time, and the rough area 20 can be performed on the case body 10, and the applicable range is wide.

[0066] It can be understood that since the rough area 20 is on the mating surface of the case lid 11 and the case body 10, the first area 13 is located on the side of the case body 10 facing the case lid 11.

[0067] Of course, the present application is not limited thereto. For example, in other embodiments of the present application, the entire case body 10 may be roughened so that the rough area 20 is on the side of the case body 10 facing the case lid 11.

[0068] In some embodiments, as shown in FIGS. 3 and 4, a sealing member 15 is provided between the case lid 11 and the case body 10. The first region 13 is located at a position facing the sealing member 15 of the case body 10. The roughened first region 13 has a better bonding ability with the sealing member 15, can increase the frictional force between the case body 10 and the sealing member 15, make the case body 10 and the sealing member 15 less slippery, and can improve the airtightness of the case assembly 30.

[0069] In some embodiments, refer to FIGS. 3 and 4. The rough region 20 includes a second region 14 provided on the case lid 11, and the roughness of the second region 14 is greater than that of the regions other than the second region 14 of the case lid 11. Thereby, by increasing the local roughness of the case lid 11, the firmness of the fit between the case lid 11 and the case body 10 is improved, and it is convenient for the roughening process, shortening the roughening process time. Moreover, the rough region 20 can be formed on the case body 10, and has a wide application range.

[0070] Understandably, since the rough region 20 is located on the surfaces of the case lid 11 and the case body 10 that fit with each other, the second region 14 is located on the side of the case lid 11 facing the case body 10.

[0071] Of course, the present application is not limited thereto. For example, in other embodiments of the present application, the entire case lid 11 may be roughened such that the rough region 20 is on the side of the case lid 11 facing the case body 10.

[0072] In some embodiments, as shown in FIGS. 3 and 4, a sealing member 15 is provided between the case lid 11 and the case body 10. The second region 14 is located at a position facing the sealing member 15 of the case lid 11. The roughened second region 14 has a better bonding ability with the sealing member 15, can increase the frictional force between the case lid 11 and the sealing member 15, make the case lid 11 and the sealing member 15 less slippery, and can improve the airtightness of the case assembly 30.

[0073] In some embodiments, as shown in FIGS. 3 and 4, the case body 10 includes a peripheral wall portion 101 and an end wall portion 102. The end wall portion 102 is connected to the axial end of the peripheral wall portion 101 and abuts against the outer side in the axial direction of the outer edge portion 112 of the case lid 11 (i.e., the side far from the central cross-section of the case body 10 in the axial direction of the case body 10). The rough area 20 is located between the end wall portion 102 and the outer edge portion 112, which can increase the frictional force between the end wall portion 102 and the outer edge portion 112, and the direction of the frictional force has a more effective anti-slip effect, effectively suppressing the slip between the end wall portion 102 and the outer edge portion 112, preventing the case lid 11 from popping out from the opening 104 of the case body 10, and further enhancing the pressure resistance of the case assembly 30. At the same time, by means of the end wall portion 102 abutting against the outer side in the axial direction of the outer edge portion 112 of the case lid 11, the attachment with the case lid 11 becomes easier, simplifies the attachment steps, and improves the reliability of the fitting between the case body 10 and the case lid 11. Preferably, the end wall portion 102 is annular.

[0074] In some embodiments, as shown in FIGS. 3 and 4, the rough area 20 includes a first area 13 on the inner surface of the end wall portion 102 and / or a second area 14 on the outer surface of the outer edge portion 112.

[0075] In the above technical solution, the rough area 20 includes the first area 13 on the inner surface of the end wall portion 102 or the second area 14 on the outer surface of the outer edge portion 112, both of which can increase the frictional force between the end wall portion 102 and the outer edge portion 112, suppress the slip between the end wall portion 102 and the outer edge portion 112, and further improve the pressure resistance of the case assembly 30. When the rough area 20 includes the first area 13 on the inner surface of the end wall portion 102 and the second area 14 on the outer surface of the outer edge portion 112, the method of roughening both the end wall portion 102 and the outer edge portion 112 has a better effect of increasing the frictional force and can better enhance the pressure resistance of the case assembly 30 than roughening only one of them.

[0076] In some embodiments, as shown in FIGS. 3 and 4, a seal member 15 is provided between the end wall portion 102 and the outer edge portion 112. At the same time, a rough area 20 is provided between the end wall portion 102 and the outer edge portion 112, so that the bonding force between the end wall portion 102 and the seal member 15, or the bonding force between the outer edge portion 112 and the seal member 15 can be effectively increased, or the bonding force among the end wall portion 102, the outer edge portion 112 and the seal member 15 can be increased simultaneously, and further the airtightness and pressure resistance of the case assembly 30 can be improved.

[0077] In some embodiments, as shown in FIGS. 3 and 4, the case lid 11 further includes a protrusion 111. The outer edge portion 112 is provided surrounding the protrusion 111. The protrusion 111 protrudes outward with respect to the outer edge portion 112 (i.e., in a direction away from the central cross-section of the case body 10 in the axial direction of the case body 10) and extends into the inner ring area of the end wall portion 102. The protrusion 111 enlarges the expansion space in the case assembly 30, and further the pressure resistance of the battery cell 100 can be improved.

[0078] In some embodiments, by providing an explosion-proof pressure relief structure, such as an explosion-proof valve or a thin-walled portion, on the protrusion 111, it has an explosion-proof pressure relief function. Thereby, by providing an inner ring area where the protrusion 111 extends into the end wall portion 102, the shielding of the end wall portion 102 from the protrusion 111 can be avoided. By providing the explosion-proof pressure relief structure on the protrusion 111, the function of explosion-proof pressure relief can be reliably and effectively realized.

[0079] This application is not limited thereto. For example, in other embodiments of this application, the protrusion 111 may not be provided. At this time, the case lid 11 may be flat (for example, as shown in FIG. 6). Also, an explosion-proof pressure relief structure may not be provided on the protrusion 111. For example, other structures such as a liquid injection valve and a terminal post may be provided, which will not be repeatedly described here.

[0080] In some embodiments, as shown in FIGS. 3 and 4, the peripheral wall portion 101 has a constant cross-sectional shape. By providing the peripheral wall portion 101 with a constant cross-sectional shape, the storage space within the case assembly 30 can be increased, a larger volume of the electrode assembly can be stored, and the capacitance can be increased.

[0081] Optionally, the peripheral wall portion 101 may be cylindrical or cuboid. At this time, the axial direction of the case body 10 is the axial direction of the cylindrical peripheral wall portion 101, or the length or width direction of the cuboid peripheral wall portion 101, or the direction perpendicular to the case lid 11. The radial direction of the case body 10 is the direction perpendicular to the axial direction of the case body 10.

[0082] In some embodiments, as shown in FIGS. 3 and 5, the case body 10 forms the end wall portion 102 by the cold head method. The manufacturing process is simple, the required parts are few, the sealing performance of the case assembly 30 is improved, the cold head method does not require heating, it is suitable for the processing of the battery cell 100, and the safety is high.

[0083] In some other embodiments, as shown in FIG. 6, the peripheral wall portion 101 has an inwardly convex portion 103 (thus having a non-constant cross-sectional shape), and the inwardly convex portion 103 protrudes along the radial direction of the case body 10 and abuts against the inner side in the axial direction of the outer edge portion 112 (i.e., the side closer to the central cross-section of the case body 10 in the axial direction of the case body 10). In this way, the frictional force received by the case lid 11 is greater, it is less likely to pop out due to internal expansion, and the connection between the case lid 11 and the case body 10 becomes stronger.

[0084] In some embodiments, the case body 10 having the inwardly convex portion 103 on the peripheral wall portion 101 can also form the end wall portion 102 and the inwardly convex portion 103 by the cold head method. The manufacturing process is simple, the required parts are few, the sealing performance of the case assembly 30 is improved, the cold head method does not require heating, it is suitable for the processing of the battery cell 100, and the safety is high.

[0085] Please refer to FIG. 7. In some embodiments, an intermediate member 16 is provided between the mating positions of the case body 10 and the case lid 11. Sealing members 15 are provided between the intermediate member 16 and the case body 10, and between the intermediate member 16 and the case lid 11 respectively. The rough area 20 includes a third area 17 provided on the intermediate member 16. The third area 17 is provided facing the sealing member 15, and the roughness of the third area 17 is greater than the roughness of the outer surface of the case body 10 and / or the inner surface of the case lid 11.

[0086] Thereby, by providing the intermediate member 16, the pressure resistance of the case assembly 30 can be improved. On the other hand, by directly roughening the intermediate member 16, it is not necessary to roughen the case body 10 and the case lid 11, which simplifies the manufacturing process of the case body 10 and the case lid 11.

[0087] However, the present application is not limited thereto. In other embodiments of the present application, when the intermediate member 16 is provided, rough areas corresponding to the sealing member 15, such as the above-mentioned first area 13 and / or second area 14, can also be provided at the positions corresponding to the sealing member 15 on the case lid 11 and the case body 10, further improving the airtightness and pressure resistance.

[0088] In some embodiments, any of the sealing members 15 mentioned in the above embodiments may be a plastic sealing material. The plastic sealing material has a better bonding effect with the case lid 11 and the case body 10, good sealing performance, easy to operate, low cost, and can improve the reliability of the connection between the case body 10 and the case lid 11.

[0089] It should be noted that the plastic sealing material is a material that can be deformed by heat and bonded to adjacent parts. By providing the rough area 20, the thermal conductivity is improved, and the thermocompression bonding time of the plastic sealing material can be shortened. For example, in some cases, the sealing member 15 may be a sealant or the like, which can be easily obtained and used.

[0090] Moreover, by adopting a plastic sealing material instead of a seal ring structure, the package speed can be improved, the package efficiency can be enhanced, and the production cost can be reduced. On the other hand, the occupied space of the seal ring structure is saved, thereby increasing the effective volume within the case assembly 30, further ensuring the pressure resistance performance, and at the same time improving the energy density of the battery cell 100.

[0091] For example, after providing the plastic sealing material on the case lid 11 or the case body 10, by processing the end wall portion 102 of the case body 10, the case body 10 is connected to the case lid 11, realizing a reliable connection between the case lid 11 and the case body 10, and ensuring airtightness and pressure resistance.

[0092] This application provides embodiments of other aspects, proposes a battery cell 100, and the battery cell 100 includes an electrode assembly and the above-mentioned case assembly 30, and the electrode assembly is provided within the case assembly 30.

[0093] Preferably, after placing the electrode assembly into the case body 10, the case lid 11 is covered on the case body 10, and then a cold head method is performed on the connection portion between the case body 10 and the case lid 11 to realize both connections.

[0094] This application provides embodiments of further aspects and proposes a battery 1000 including a plurality of the above-mentioned battery cells 100.

[0095] This application provides embodiments of further aspects and proposes a power consumption device including the above-mentioned battery 1000.

[0096] According to some embodiments of the present application, a sealing member 15 is provided between the case body 10 and the case lid 11, and is pressed by a cold head process to form a sealed connection structure. A first roughened region 13 is processed on the contact portion between the case body 10 and the sealing member 15, and a second roughened region 14 is processed on the contact portion between the case lid 11 and the sealing member 15. The first region 13 and the second region 14 are used to make the connection between the case body 10, the sealing member 15, and the case lid 11 tighter, and improve the airtightness of the overall structure. When gas is generated inside the case assembly 30, a greater frictional force is provided between the roughened first region 13 and the second region 14, preventing deformation and slippage of the case lid 11, and enhancing the pressure resistance of the case assembly 30, thereby effectively improving the pressure resistance of the battery cell 100.

[0097] The sealing member 15 employs a plastic sealing material, such as a sealant, and at the same time, combines roughening of the mating portions of the case lid 11 and the case body 10. Compared with the conventional technology that only adopts a sealing ring structure, the bonding strength of the case lid 11, the case body 10, and the sealing member 15 is effectively improved, and the airtightness of the case assembly 30 is improved. At the same time, when high pressure fails, the rough area increases the frictional force between the case lid 11 and the case body 10, and the pressure resistance performance of the battery cell 100 can be improved. In addition, the case lid 11 and the case body 10 with rough areas improve the heat conduction efficiency with the plastic sealing material and shorten the processing time.

[0098] Also, compared with the conventional technology, the sealing ring structure can be omitted, improving the packaging speed, enhancing the packaging efficiency, and reducing the production cost. On the other hand, the occupied space of the sealing ring structure is saved, thereby increasing the effective volume inside the case assembly 30, ensuring the pressure resistance performance, and at the same time improving the energy density of the battery cell 100.

[0099] It should be noted that, when there is no conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0100] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. As long as it is within the spirit and principle of the present application, any modifications, equivalent substitutions, improvements, etc. made should all be included within the protection scope of the present application.

Description of Reference Numerals

[0101] 10000 - Vehicle, 1000 - Battery, 2000 - Controller, 3000 - Motor, 100 - Battery Cell, 200 - Box, 201 - First Box Body, 202 - Second Box Body, 10 - Case Body, 101 - Peripheral Wall Portion, 102 - End Wall Portion, 103 - Inner Convex Portion, 104 - Opening, 11 - Case Lid, 111 - Protrusion, 112 - Outer Edge Portion, 13 - First Region, 14 - Second Region, 15 - Sealing Member, 16 - Intermediate Member, 17 - Third Region, 20 - Rough Region, 30 - Case Assembly.

Claims

1. A case assembly for a battery cell, comprising: a case body having an opening; and a case lid provided in the opening, wherein the surfaces of the case lid and the case body that fit together have rough regions, the case assembly for a battery cell.

2. The rough region includes a first region provided on the case body, and the roughness of the first region is greater than the roughness of the region other than the first region of the case body. The case assembly for a battery cell according to Claim 1.

3. A seal member is provided between the case lid and the case body, and the first region is located at a position facing the seal member of the case body. The case assembly for a battery cell according to Claim 2.

4. The rough region includes a second region provided on the case lid, and the roughness of the second region is greater than the roughness of the region other than the second region of the case lid. The case assembly for a battery cell according to any one of Claims 1 to 3.

5. A seal member is provided between the case lid and the case body, and the second region is located at a position facing the seal member of the case lid. The case assembly for a battery cell according to Claim 4.

6. The case body includes a peripheral wall portion and an end wall portion. The end wall portion is connected to the axial end of the peripheral wall portion. The end wall portion is abutted against the outer side in the axial direction of the outer edge portion of the case lid. The rough region is located between the end wall portion and the outer edge portion. The case assembly for a battery cell according to any one of Claims 1 to 5.

7. The rough region includes a first region on the inner surface of the end wall portion and / or a second region on the outer surface of the outer edge portion. The case assembly for a battery cell according to Claim 6.

8. A seal member is provided between the end wall portion and the outer edge portion. The case assembly for a battery cell according to Claim 6 or 7.

9. The case lid further includes a protruding portion. The outer edge portion is provided surrounding the protruding portion. The protruding portion protrudes outward with respect to the outer edge portion and extends into the inner ring region of the end wall portion. The case assembly for a battery cell according to any one of Claims 6 to 8.

10. An explosion-proof pressure relief structure is provided on the protruding portion. The case assembly for a battery cell according to Claim 9.

11. The peripheral wall portion has an inwardly protruding portion, and the inwardly protruding portion protrudes along the radial direction of the case body and abuts against the inner side in the axial direction of the outer edge portion. The case assembly of the battery cell according to any one of claims 6 to 10.

12. The case body forms the end wall portion by a cold head method. The case assembly of the battery cell according to any one of claims 6 to 11.

13. An intermediate member is provided between the positions where the case body and the case lid are fitted to each other. Sealing members are provided between the intermediate member and the case body, and between the intermediate member and the case lid, respectively. The rough region includes a third region provided on the intermediate member. The third region is provided facing the sealing member, and the roughness of the third region is greater than the roughness of the outer surface of the case body and / or the inner surface of the case lid. The case assembly of the battery cell according to any one of claims 1 to 12.

14. The sealing member is a plastic sealing material. The case assembly of the battery cell according to any one of claims 3, 5, 8, 13.

15. A battery cell comprising an electrode assembly and the case assembly of the battery cell according to any one of claims 1 to 14, wherein the electrode assembly is provided in the case assembly.

16. A battery including a plurality of the battery cells according to claim 15.

17. A power consumption device including the battery according to claim 16.

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