Shell assembly, battery monomer, battery and electric device

Abstract

The utility model relates to a shell assembly, a battery monomer, a battery and a power utilization device, and the shell assembly comprises a shell which is provided with an accommodating space; the insulating layer is used for coating the electrode assembly; the bottom supporting plate is arranged in the accommodating space and is used for supporting the electrode assembly; wherein a limiting part is convexly arranged on the insulating layer along the first direction, and the limiting part is connected with the bottom supporting plate and is used for limiting the displacement of the bottom supporting plate relative to the insulating layer along the direction intersected with the first direction. When the electrode assembly is coated with the insulating layer, the limiting part can limit the bottom supporting plate, so that the bottom supporting plate, the insulating layer and the electrode assembly can be relatively fixed, and the bottom supporting plate can more stably support the electrode assembly; and moreover, the probability of relative displacement between the bottom supporting plate and the insulating layer and between the bottom supporting plate and the electrode assembly can be reduced, and the overall assembly yield of the battery monomers is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a housing assembly, a battery cell, a battery and an electrical device. Background Art

[0002] In the structure of a battery cell, the electrode assembly is placed in a shell, which can protect the electrode assembly. During the transfer and transportation of the battery cell, the electrode assembly is prone to shaking or displacement inside the shell, thus affecting the structure of the electrode assembly. Therefore, the electrode assembly needs to be fixed by a structure such as a bottom support plate.

[0003] However, due to a certain size difference between the bottom support plate and the electrode assembly, relative displacement between the bottom support plate and the electrode assembly is likely to occur during the process of the bottom support plate supporting the electrode assembly, resulting in poor support effect and affecting the overall assembly yield of the battery cell. Utility Model Content

[0004] Based on this, it is necessary to provide a shell assembly, a battery cell, a battery and an electrical device to address the problem that relative displacement between the bottom support plate and the electrode assembly is prone to occur during the process of supporting the electrode assembly, resulting in poor supporting effect.

[0005] In a first aspect, the present application provides a housing assembly, comprising:

[0006] A housing having a receiving space for placing the electrode assembly;

[0007] An insulating layer, used to cover the outside of the electrode assembly; and

[0008] A bottom support plate is arranged in the accommodation space and used to support the electrode assembly;

[0009] Wherein, a limiting portion is protruded on the insulating layer along the first direction, the limiting portion is connected to the bottom supporting plate, and is used to limit the displacement of the bottom supporting plate relative to the insulating layer along a direction intersecting the first direction.

[0010] Thus, during the assembly process, the insulating layer is coated on the outside of the electrode assembly, and on the basis of protecting the electrode assembly, the electrode assembly can be insulated from the inner wall of the shell. On this basis, the limiting part can limit the bottom support plate so that the bottom support plate, the insulating layer and the electrode assembly can be relatively fixed, so that the bottom support plate can support the electrode assembly more stably, and the probability of relative displacement between the bottom support plate, the insulating layer and the electrode assembly can be reduced, thereby improving the overall assembly yield of the battery cell.

[0011] In some embodiments, the limiting portion includes a first sub-portion and a second sub-portion spaced apart along the second direction, a limiting groove is formed between the first sub-portion and the second sub-portion, and at least part of the bottom support plate is limited in the limiting groove;

[0012] The second direction is parallel to the bottom support plate and intersects with the first direction.

[0013] Through the above structure, the limiting groove formed by the first sub-part and the second sub-part can limit the bottom support plate, so that a fixed connection is achieved between the insulating layer and the bottom support plate, reducing the probability of relative displacement between the insulating layer and the bottom support plate, improving the assembly yield between the bottom support plate, the insulating layer and the electrode assembly, and enabling the bottom support plate to support the electrode assembly more stably.

[0014] In some embodiments, the first sub-portion and the second sub-portion each include a plurality of first protrusions spaced apart along a third direction, the third direction is parallel to the bottom support plate and intersects the first direction and the second direction respectively.

[0015] When the bottom support plate is limited in the limiting groove, the multiple first protrusions can make the pressure exerted on both ends of the bottom support plate along the second direction more uniform, thereby making the position of the bottom support plate in the limiting groove more stable, further reducing the probability of relative displacement between the bottom support plate and the insulating layer, and improving the supporting stability of the bottom support plate for the electrode assembly.

[0016] In some embodiments, a clamping groove is formed between every two adjacent first protrusions along the third direction;

[0017] The bottom support plate includes a plate body and at least two second protrusions, wherein the at least two second protrusions are respectively protruded along the second direction at opposite ends of the plate body, the plate body is configured to be able to be engaged in the limiting groove, and each second protrusion is configured to be able to be engaged in the engaging groove.

[0018] Therefore, by providing the clamping groove and the second protrusion, the bottom support plate can be more stably limited between the insulating layer, thereby improving the assembly stability between the bottom support plate, the insulating layer and the electrode assembly.

[0019] In some embodiments, the insulating layer has a connection surface arranged parallel to the bottom support plate, and each first protrusion is arranged on the connection surface;

[0020] In the second direction, the width of the board body is L1, the width of each second bump is L2, the width of the connecting surface is L3, and L2=(L3-L1) / 2.

[0021] Therefore, through the above structure, on the one hand, the bottom support plate can better support the electrode assembly and improve the support stability. On the other hand, it can also achieve limitation between the bottom support plate and the insulating layer, improve the connection stability between the bottom support plate and the insulating layer, and improve the assembly yield.

[0022] In some embodiments, in the first direction, the thickness of each second bump is D1, the thickness of the board body is D2, and D1≤D2.

[0023] Therefore, each second protrusion can be smoothly clamped and fixed with each clamping groove without affecting the overall thickness of the bottom support plate.

[0024] In some embodiments, the bottom support plate includes a plate body and at least two second protrusions, wherein the at least two second protrusions are respectively protruded along the second direction and disposed at opposite ends of the plate body, and are detachably connected to the plate body;

[0025] The plate body is configured to be snap-fitted into the limiting groove.

[0026] Therefore, through the detachable connection, each second protrusion can be reused, thereby improving practicality.

[0027] In a second aspect, the present application further provides a battery cell, comprising:

[0028] The housing assembly as described above, wherein the housing assembly has a receiving space;

[0029] The electrode assembly is arranged in the accommodating space.

[0030] In some embodiments, the housing assembly includes a shell and a top cover, the accommodation space is located inside the shell, and the two opposite ends of the shell also have openings communicating with the accommodation space, and the top cover is sealed at each opening;

[0031] A positive electrode ear and a negative electrode ear are respectively formed at opposite ends of the electrode assembly, and the positive electrode ear and the negative electrode ear are respectively connected to corresponding top covers.

[0032] In a third aspect, the present application also provides a battery, comprising the battery cell as described above.

[0033] In a fourth aspect, the present application also provides an electrical device, comprising the battery as described above.

[0034] The above-mentioned shell assembly, battery cell, battery and electrical device, the insulating layer is coated on the outside of the electrode assembly, on the basis of forming protection for the electrode assembly, the electrode assembly and the inner wall of the shell can be insulated, on this basis, a limiting portion is provided on the insulating layer, when the insulating layer is coated on the outside of the electrode assembly, the limiting portion can limit the bottom support plate, so that the bottom support plate and the insulating layer and the electrode assembly can be relatively fixed, so that the bottom support plate can support the electrode assembly more stably, and can reduce the probability of relative displacement between the bottom support plate and the insulating layer and the electrode assembly, thereby improving the overall assembly yield of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG. 1 is a schematic structural diagram of a battery cell according to one or more embodiments.

[0036] FIG. 2 is a schematic diagram of an assembly structure of a bottom support plate, an insulating layer, and an electrode assembly according to one or more embodiments.

[0037] FIG. 3 is a partial stereoscopic view of point A in FIG. 2 .

[0038] FIG. 4 is a schematic diagram of an assembly structure of a bottom support plate and an insulating layer according to one or more embodiments.

[0039] FIG. 5 is a schematic diagram of the structure of a bottom support plate and an insulating layer according to one or more embodiments.

[0040] FIG. 6 is a schematic diagram of the structure of a bottom support plate and an insulating layer according to one or more embodiments.

[0041] FIG. 7 is a schematic diagram of the structure of a bottom support plate and an insulating layer according to one or more embodiments.

[0042] Explanation of the reference numerals: 100, battery cell; 10, shell assembly; 20, electrode assembly; 11, shell; 12, insulating layer; 13, bottom support plate; 14, limiting portion; 15, top cover; 111, accommodating space; 121, connecting surface; 131, board body; 132, second protrusion; 141, first sub-section; 142, second sub-section; 143, limiting groove; 144, first protrusion; 145, snap-in groove; a, first direction; b, second direction; c, third direction. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0044] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0049] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0050] A battery cell is the smallest unit that makes up a battery. In the structure of a battery cell, it usually includes a shell component, an electrode component, and other functional components. Among them, the shell component usually includes a shell and an end cap. The shell has a storage space inside, and the electrode component can be placed in the storage space, so that the shell protects the electrode component.

[0051] Furthermore, the shell is usually made of metal materials such as copper, iron, and aluminum. In order to avoid short circuit between the electrode assembly and the inner wall of the shell, an insulating film is also coated on the outside of the electrode assembly to insulate the electrode assembly from the inner wall of the shell.

[0052] When the electrode assembly is placed in the shell, due to the gap between the electrode assembly and the inner wall of the shell, when the battery cell is transferred or transported, the electrode assembly is prone to shaking or displacement inside the shell, which will affect the structure of the electrode assembly.

[0053] Based on this, a bottom support plate is usually provided in the current battery cell to support the electrode assembly. However, in order to facilitate assembly, the width of the bottom support plate is often smaller than the thickness of the electrode assembly. However, in this way, the position of the bottom support plate and the electrode assembly is easily offset, which reduces the support stability of the bottom support plate for the electrode assembly.

[0054] In addition, during the assembly process, the positions of the bottom support plate, the electrode assembly and the insulating layer cannot be fixed, which further increases the difficulty of assembly. In addition, relative displacement is likely to occur between the bottom support plate, the electrode assembly and the insulating layer, resulting in an increase in the assembly defect rate.

[0055] Based on the above considerations, in order to solve the problem that the bottom support plate is prone to relative displacement between the two during the process of supporting the electrode assembly, resulting in poor supporting effect, a shell assembly is provided in one or more embodiments of the present application, and an insulating layer is coated on the outside of the electrode assembly. On the basis of protecting the electrode assembly, the electrode assembly and the inner wall of the shell can be insulated. On this basis, a limiting portion is provided on the insulating layer. When the insulating layer is coated on the outside of the electrode assembly, the limiting portion can limit the bottom support plate so that the bottom support plate and the insulating layer and the electrode assembly can be relatively fixed, so that the bottom support plate can support the electrode assembly more stably, and can reduce the probability of relative displacement between the bottom support plate and the insulating layer and the electrode assembly, thereby improving the overall assembly yield of the battery cell.

[0056] Referring to Fig. 1, Fig. 2 and Fig. 3, an embodiment of the present application provides a housing assembly 10, comprising a housing 11, an insulating layer 12 and a bottom support plate 13, wherein the housing 11 has a receiving space 111 for placing an electrode assembly 20, the insulating layer 12 is used to cover the outside of the electrode assembly 20, and the bottom support plate 13 is disposed in the receiving space 111 and is used to support the electrode assembly 20. Among them, a limiting portion 14 is protruded on the insulating layer 12 along a first direction a, the limiting portion 14 is connected to the bottom support plate 13, and is used to limit the displacement of the bottom support plate 13 relative to the insulating layer 12 along a direction intersecting the first direction a.

[0057] It should be noted that the shell 11 refers to a component having a receiving space 111 formed inside for placing the electrode assembly 20 , so as to protect the electrode assembly 20 and other structures located inside the shell 11 .

[0058] The insulating layer 12 refers to a component that can be coated on the outside of the electrode assembly 20 and placed in the accommodation space 111 together with the electrode assembly 20. The insulating layer 12 can be, but is not limited to, set as a Mylar film and coated on the outside of the electrode assembly 20. Therefore, the insulating layer 12 can, on the one hand, play a certain protective role on the electrode assembly 20, and on the other hand, when the electrode assembly 20 is placed inside the shell 11, the insulating layer 12 can play an insulating role between the electrode assembly 20 and the inner wall of the shell 11.

[0059] The bottom support plate 13 refers to a structure disposed between the electrode assembly 20 and the inner wall of the shell 11, and used to support the electrode assembly 20. During the assembly process, the bottom support plate 13 can be disposed inside the insulating layer 12 or outside the insulating layer 12. That is, the insulating layer 12 can be first coated on the outside of the electrode assembly 20, and then the bottom support plate 13 can be disposed between the inner wall of the shell 11 and the insulating layer 12. It is also possible to first assemble the bottom support plate 13 with one of the supporting surfaces of the electrode assembly 20, and then coat the insulating layer 12 together on the bottom support plate 13 and the outside of the electrode assembly 20, and then put the electrode assembly 20, the bottom support plate 13 and the insulating layer 12 into the accommodating space 111 together.

[0060] Specifically, the insulating layer 12 needs to be folded during the process of being coated on the outside of the electrode assembly 20 so that the insulating layer 12 can smoothly cover the various outer surfaces of the electrode assembly 20. Therefore, after being coated on the electrode assembly 20, the insulating layer 12 forms a plurality of side surfaces, one of which is parallel to the bottom support plate 13 and is arranged in contact with the bottom support plate 13, and the side surface is configured as a connection surface 121 on which the limiting portion 14 is arranged.

[0061] Furthermore, after the bottom support plate 13, the electrode assembly 20 and the insulating layer 12 are assembled and placed in the accommodating space 111, the bottom support plate 13 is usually arranged opposite to the bottom surface of the electrode assembly 20 so as to support the electrode assembly 20. At this time, the supporting direction of the bottom support plate 13 for the electrode assembly 20 is the vertical direction.

[0062] Based on this, the first direction a is set as the supporting direction, that is, the vertical direction. The limiting portion 14 is protrudingly formed on the connection surface 121 of the insulating layer 12. When the bottom supporting plate 13 is connected to the insulating layer 12, the limiting portion 14 can limit the bottom supporting plate 13 to limit the displacement of the bottom supporting plate 13 relative to the insulating layer 12 in a direction perpendicular to the first direction a, that is, in a horizontal direction.

[0063] Thus, during the assembly process, the insulating layer 12 is coated on the outside of the electrode assembly 20, and on the basis of protecting the electrode assembly 20, the electrode assembly 20 can be insulated from the inner wall of the shell 11. On this basis, the limiting portion 14 can limit the bottom support plate 13 so that the bottom support plate 13, the insulating layer 12 and the electrode assembly 20 can be relatively fixed, so that the bottom support plate 13 can support the electrode assembly 20 more stably, and the probability of relative displacement between the bottom support plate 13, the insulating layer 12 and the electrode assembly 20 can be reduced, thereby improving the overall assembly yield of the battery cell 100.

[0064] Please refer to FIG. 2 and FIG. 4 together. In some embodiments, the limiting portion 14 includes a first sub-portion 141 and a second sub-portion 142 spaced apart along the second direction b, and a limiting groove 143 is formed between the first sub-portion 141 and the second sub-portion 142, and at least part of the bottom support plate 13 is limited in the limiting groove 143. The second direction b is parallel to the bottom support plate 13 and intersects with the first direction a.

[0065] Specifically, the second direction b is arranged perpendicular to the first direction a, and when the first direction a is arranged along a vertical direction, the second direction b is arranged as a first horizontal direction.

[0066] The first sub-portion 141 and the second sub-portion 142 are both protruded on the insulating layer 12 along the first direction a, and a limiting groove 143 is formed between the first sub-portion 141 and the second sub-portion 142 along the second direction b. The width of the insulating layer 12 in the second direction b matches the width of the bottom support plate 13 in the second direction b.

[0067] Therefore, during the assembly of the bottom support plate 13, the insulating layer 12 and the electrode assembly 20, at least a portion of the bottom support plate 13 can be engaged in the limiting groove 143, so that the first sub-portion 141 and the second sub-portion 142 surrounding the limiting groove 143 can limit the bottom support plate 13, thereby achieving a fixed connection between the insulating layer 12 and the bottom support plate 13, and reducing the probability of relative displacement between the insulating layer 12 and the bottom support plate 13.

[0068] Through the above structure, the limiting groove 143 formed by the first sub-part 141 and the second sub-part 142 can limit the bottom support plate 13, so that a fixed connection is achieved between the insulating layer 12 and the bottom support plate 13, reducing the probability of relative displacement between the insulating layer 12 and the bottom support plate 13, improving the assembly yield between the bottom support plate 13, the insulating layer 12 and the electrode assembly 20, and enabling the bottom support plate 13 to support the electrode assembly 20 more stably.

[0069] In some embodiments, the first sub-portion 141 and the second sub-portion 142 both include a plurality of first protrusions 144 spaced apart along a third direction c. The third direction c is parallel to the bottom support plate 13 and intersects with the first direction a and the second direction b, respectively.

[0070] Specifically, the third direction c is arranged perpendicular to the first direction a and the second direction b, that is, when the first direction a is arranged along the vertical direction and the second direction b is arranged along the first horizontal direction, the third direction c is arranged along the second horizontal direction.

[0071] When the bottom support plate 13 is limited in the limiting groove 143, the multiple first protrusions 144 can make the pressure exerted on both ends of the bottom support plate 13 along the second direction b more uniform, thereby making the position of the bottom support plate 13 in the limiting groove 143 more stable, further reducing the probability of relative displacement between the bottom support plate 13 and the insulating layer 12, and improving the supporting stability of the bottom support plate 13 for the electrode assembly 20.

[0072] In some embodiments, a snap-in groove 145 is formed between each two adjacent first protrusions 144 along the third direction c. The bottom support plate 13 includes a plate body 131 and at least two second protrusions 132, at least two second protrusions 132 are respectively protruded along the second direction b and disposed at opposite ends of the plate body 131, the plate body 131 is configured to be snap-fitted into the limiting groove 143, and each second protrusion 132 is configured to be snap-fitted into the snap-in groove 145.

[0073] As shown in Fig. 5, Fig. 6 and Fig. 7, specifically, the shape of the plate body 131 matches the contour of the limiting groove 143, so that the plate body 131 can be smoothly engaged in the limiting groove 143. At the same time, each second protrusion 132 is respectively protruded along the second direction b and is disposed at opposite ends of the plate body 131. Therefore, when the plate body 131 is engaged in the limiting groove 143, each second protrusion 132 can be engaged in each engaging groove 145 in a one-to-one correspondence.

[0074] Further, the shape of each second protrusion 132 matches the profile of each snap-in groove 145. Specifically, each second protrusion 132 can be, but is not limited to, set as a rectangular protrusion, a trapezoidal protrusion, a triangular protrusion, etc. When each second protrusion 132 is set as a rectangular protrusion, each snap-in groove 145 is set as a rectangular groove body. When each second protrusion 132 is set as a trapezoidal protrusion, each snap-in groove 145 is set as a trapezoidal groove body. When each second protrusion 132 is set as a triangular protrusion, each snap-in groove 145 is set as a triangular groove body. As a result, each second protrusion 132 can be better engaged in the corresponding snap-in groove 145.

[0075] Therefore, by providing the snap-fit ​​groove 145 and the second protrusion 132 , the bottom support plate 13 can be more stably limited between the insulating layer 12 , thereby improving the assembly stability between the bottom support plate 13 , the insulating layer 12 and the electrode assembly 20 .

[0076] Please refer to FIG. 4 again. In some embodiments, the insulating layer 12 has a connection surface 121 arranged parallel to the bottom support plate 13, and each first protrusion 144 is arranged on the connection surface 121. In the second direction b, the width of the board body 131 is L1, the width of each second protrusion 132 is L2, and the width of the connection surface 121 is L3, L2=(L3-L1) / 2.

[0077] Specifically, the bottom support plate 13 is disposed at the bottom of the electrode assembly 20 and is disposed parallel to the bottom surface of the electrode assembly 20 . Thus, when the insulating layer 12 is coated on the electrode assembly 20 , the connecting surface 121 is the bottom surface of the insulating layer 12 .

[0078] When the bottom support plate 13 is enclosed in the insulating layer 12, each first protrusion 144 protrudes upwards and is disposed on the connection surface 121, and is mutually engaged with the bottom support plate 13. When the bottom support plate 13 is located outside the insulating layer 12, each first protrusion 144 protrudes downwards and is disposed on the connection surface 121, and is mutually engaged with the bottom support plate 13.

[0079] Further, in the second direction b, L2=(L3-L1) / 2, so that the sum of the width of the plate body 131 and the width of each second protrusion 132 is equal to the width of the connection surface 121, that is, by providing each second protrusion 132, the width of the bottom support plate 13 in the second direction b is increased, so that the overall width of the bottom support plate 13 matches the width of the electrode assembly 20, so that the bottom support plate 13 can better support the electrode assembly 20 and improve the support stability. In addition, each second protrusion 132 can also achieve the limit between the insulating layer 12, improve the connection stability between the bottom support plate 13 and the insulating layer 12, and improve the assembly yield.

[0080] Therefore, through the above structure, on the one hand, the bottom support plate 13 can better support the electrode assembly 20 and improve the support stability. On the other hand, it can also achieve the limitation between the bottom support plate 13 and the insulating layer 12, improve the connection stability between the bottom support plate 13 and the insulating layer 12, and improve the assembly yield.

[0081] In some embodiments, in the first direction a, the thickness of each second bump 132 is D1, the thickness of the plate body 131 is D2, and D1≤D2.

[0082] Specifically, the thickness of each second protrusion 132 can be set to be equal to the thickness of the plate body 131, or can be set to be less than the thickness of the plate body 131. Thus, each second protrusion 132 can be smoothly fixed with each snap-fit ​​groove 145 without affecting the overall thickness of the bottom support plate 13.

[0083] In some embodiments, the bottom support plate 13 includes a plate body 131 and at least two second protrusions 132, wherein the at least two second protrusions 132 are respectively protruded along the second direction b at opposite ends of the plate body 131 and are detachably connected to the plate body 131. The plate body 131 is configured to be able to be engaged in the limiting groove 143.

[0084] Each second protrusion 132 is detachably connected to the plate body 131. During the assembly process, the bottom support plate 13 and the electrode assembly 20 can be assembled and positioned first. Due to the setting of each second protrusion 132, the overall width of the bottom support plate 13 is equal to the thickness of the electrode assembly 20, so as to facilitate the positioning between the bottom support plate 13 and the electrode assembly 20 and enable the bottom support plate 13 to stably support the electrode assembly 20.

[0085] After positioning is completed, each second protrusion 132 can be removed from the plate body 131 and the insulating layer 12 can be assembled so that the plate body 131 is engaged in the limiting groove 143 of the insulating layer 12 to achieve the connection and fixation between the insulating layer 12 and the bottom support plate 13 and the electrode assembly 20.

[0086] Based on this, through the detachable connection, each second protrusion 132 can be reused, thereby improving practicality.

[0087] Please refer to FIG. 1 again. Based on the same concept as the above-mentioned housing assembly 10 , the present application also provides a battery cell 100 , including an electrode assembly 20 and the above-mentioned housing assembly 10 . The housing assembly 10 has a receiving space 111 , and the electrode assembly 20 is disposed in the receiving space 111 .

[0088] In some embodiments, the housing assembly 10 includes a housing 11 and a top cover 15, the accommodation space 111 is located inside the housing 11, the housing 11 has openings at opposite ends thereof communicating with the accommodation space 111, and the top cover 15 is sealed at each opening. The electrode assembly 20 has positive and negative tabs at opposite ends thereof, respectively, and the positive and negative tabs are connected to the corresponding top covers 15, respectively.

[0089] It should be noted that the battery cell 100 includes a structure with two-end tabs and a structure with one-end tabs, wherein, for the structure with two-end tabs, the positive tab and the negative tab extend from opposite ends of the electrode assembly 20. At this time, the positive tab extends toward one side opening of the housing 11, and the negative tab extends toward the other side opening of the housing 11.

[0090] When the top covers 15 are sealed at the openings on both sides, the positive electrode ear is connected to the top cover 15 on one side by welding, and the negative electrode ear is connected to the top cover 15 on the other side by welding.

[0091] Based on the same concept as the above-mentioned battery cell 100 , the present application also provides a battery, including the above-mentioned battery cell 100 .

[0092] Based on the same concept as the above-mentioned battery, the present application also provides an electrical device, including the above-mentioned battery.

[0093] According to one or more embodiments, during the assembly process of the battery cell 100, the bottom support plate 13 and the electrode assembly 20 can be first assembled and connected so that the bottom support plate 13 and the bottom surface of the electrode assembly 20 are fitted together, and then the insulating layer 12 is coated on the outside of the bottom support plate 13 and the electrode assembly 20, and the plate body 131 of the bottom support plate 13 is engaged in the limiting groove 143 of the insulating layer 12 to achieve the positioning connection between the insulating layer 12 and the bottom support plate 13 and the electrode assembly 20.

[0094] In addition, the insulating layer 12 can be first wrapped around the outside of the electrode assembly 20, and then the plate body 131 of the bottom support plate 13 can be engaged in the limiting groove 143 of the insulating layer 12, and each second protrusion 132 can be engaged in each engaging groove 145, so as to achieve the positioning connection between the bottom support plate 13 and the insulating layer 12 and the electrode assembly 20.

[0095] After the bottom support plate 13, the insulating layer 12 and the electrode assembly 20 are assembled, they are placed in the accommodation space 111 of the housing 11, and the bottom support plate 13 supports the electrode assembly 20. At the same time, the positive electrode ear of the electrode assembly 20 extends from one side opening of the housing 11 and is welded to the top cover 15 on that side. The negative electrode ear of the electrode assembly 20 extends from the other side opening of the housing 11 and is welded to the top cover 15 on the other side. In this way, the battery cell 100 is assembled.

[0096] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A housing assembly, characterized in that: include: A housing having a receiving space for placing the electrode assembly; An insulating layer, used for covering the outside of the electrode assembly; and A bottom support plate, disposed in the accommodation space and used to support the electrode assembly; A limiting portion is protruded on the insulating layer along a first direction, the limiting portion is connected to the bottom supporting plate and is used to limit the displacement of the bottom supporting plate relative to the insulating layer along a direction intersecting the first direction.

2. The housing assembly according to claim 1, characterized in that The limiting portion comprises a first sub-portion and a second sub-portion spaced apart along the second direction, a limiting groove is formed between the first sub-portion and the second sub-portion, and at least a part of the bottom support plate is limited in the limiting groove; Wherein, the second direction is parallel to the bottom supporting plate and intersects with the first direction.

3. The housing assembly according to claim 2, characterized in that The first sub-portion and the second sub-portion each include a plurality of first protrusions spaced apart along a third direction, wherein the third direction is parallel to the bottom support plate and intersects with the first direction and the second direction respectively.

4. The housing assembly according to claim 3, characterized in that: A clamping groove is formed between each two adjacent first protrusions along the third direction; The bottom support plate includes a plate body and at least two second protrusions, at least two of the second protrusions are respectively protruded along the second direction at opposite ends of the plate body, the plate body is configured to be able to be engaged in the limiting groove, and each of the second protrusions is configured to be able to be engaged in the engaging groove.

5. The housing assembly according to claim 4, characterized in that: The insulating layer has a connection surface arranged parallel to the bottom support plate, and each of the first protrusions is arranged on the connection surface; In the second direction, the width of the board body is L1, the width of each of the second bumps is L2, the width of the connecting surface is L3, and L2=(L3-L1) / 2.

6. The housing assembly according to claim 4 or 5, characterized in that: In the first direction, the thickness of each of the second bumps is D1, the thickness of the plate body is D2, and D1≤D2.

7. The housing assembly according to claim 3, characterized in that: The bottom support plate comprises a plate body and at least two second protrusions, wherein the at least two second protrusions are respectively protruded along the second direction and arranged at opposite ends of the plate body, and are detachably connected to the plate body; Wherein, the plate body is configured to be able to be engaged in the limiting groove.

8. A battery cell, characterized in that: include: The housing assembly according to any one of claims 1 to 7, wherein the housing assembly has a receiving space; The electrode assembly is arranged in the accommodating space.

9. The battery cell according to claim 8, characterized in that: The housing assembly comprises a shell and a top cover, the accommodation space is located inside the shell, the two opposite ends of the shell also have openings communicating with the accommodation space, and the top cover is sealed and arranged at each of the openings; A positive electrode ear and a negative electrode ear are respectively formed at opposite ends of the electrode assembly, and the positive electrode ear and the negative electrode ear are respectively connected to the corresponding top cover.

10. A battery, characterized in that: Comprising the battery cell as claimed in claim 8 or 9.

11. An electrical device, characterized in that: Comprising the battery as claimed in claim 10.

Images