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, the shell assembly comprises: a shell having an accommodating space, the two opposite ends of the shell along a first direction being respectively provided with an opening; the bottom supporting plate is arranged in the containing space and located on at least one side of the electrode assembly and the mechanical part in the direction intersecting with the first direction, and the bottom supporting plate is provided with a first supporting part and a second supporting part; in the direction intersecting with the first direction, the thickness of the first supporting part is not equal to that of the second supporting part. The thickness of the first supporting part is not equal to that of the second supporting part, so that the first supporting part and the second supporting part can adapt to the width of the electrode assembly and the width of the mechanical part in the direction intersecting with the first direction correspondingly, the electrode assembly and the mechanical part can be supported more stably, and the electrode assembly and the mechanical part are kept at the same height; the probability of deformation of the bottom supporting plate under the action of external force is reduced, and the stability of the whole structure of the battery monomer 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, the current bottom support plate structure is easily deformed due to external forces during use, and has poor supporting stability, which affects the supporting effect for the electrode assembly. 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 the current bottom support plate structure is easily deformed due to external forces during use and has poor supporting stability.

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

[0006] A shell having a storage space for storing the electrode assembly and the mechanical parts, and two opposite ends of the shell along the first direction respectively have openings communicating with the storage space; and

[0007] A bottom support plate is disposed in the accommodation space and is located on at least one side of the electrode assembly and the mechanical part along a direction intersecting the first direction, and the bottom support plate has a first support portion for supporting the electrode assembly and a second support portion for supporting the mechanical part;

[0008] Wherein, in a direction intersecting with the first direction, the thickness of the first support portion is not equal to the thickness of the second support portion, so that the electrode assembly and the mechanical part maintain the same height along the direction intersecting with the first direction.

[0009] Through the above structure, when the electrode assembly and the mechanical parts are both accommodated in the accommodating space, the first supporting portion on the bottom support plate supports the electrode assembly, and the second supporting portion supports the mechanical parts. Since the thicknesses of the first supporting portion and the second supporting portion in the direction intersecting the first direction are not equal, the first supporting portion and the second supporting portion can respectively adapt to the widths of the electrode assembly and the mechanical parts in the direction intersecting the first direction. In this way, the bottom support plate can support the electrode assembly and the mechanical parts more stably, so that the electrode assembly and the mechanical parts are maintained at the same height along the direction intersecting the first direction, reducing the probability of deformation of the bottom support plate under the action of external force, and improving the stability of the overall structure of the battery cell.

[0010] In some embodiments, the bottom support plate is disposed on at least one side of the electrode assembly and the mechanical part along the second direction, and in the second direction, the thickness of the first support portion is not equal to the thickness of the second support portion, so that the electrode assembly and the mechanical part are maintained at the same height along the second direction;

[0011] The second direction intersects with the first direction, and when the electrode assembly is located in the accommodating space, the width direction of the electrode assembly is arranged along the second direction.

[0012] Through the above structure, the bottom support plate supports the electrode assembly and mechanical parts along the width direction of the electrode assembly. On the basis of achieving stable support for the electrode assembly and the mechanical parts, more installation space can be released for the electrode assembly, which can improve the energy density of the battery cell.

[0013] In some embodiments, in the second direction, a thickness of the second support portion is greater than a thickness of the first support portion.

[0014] Therefore, in the second direction, the thickness of the second support part is set to be greater than the thickness of the first support part, so that the first support part can better support the electrode assembly, the second support part can better support the mechanical part, and the electrode assembly and the mechanical part can be kept at the same height along the second direction, reducing the probability of deformation of the bottom support plate under the action of external force.

[0015] In some embodiments, in the second direction, the thickness of the first support portion is L1, the thickness of the second support portion is L2, the width of the electrode assembly is L3, and the width of the mechanical part is L4;

[0016] Among them, L2-L1=(L3-L4) / 2.

[0017] Through the above structure, the first support part can better support the electrode assembly, the second support part can better support the mechanical part, and the electrode assembly and the mechanical part can be kept at the same height along the second direction, reducing the probability of deformation of the bottom support plate under the action of external force.

[0018] In some embodiments, in the first direction, the height of the second support portion is H1, and the height of the mechanical component is H2, wherein H1≤H2.

[0019] Through the above structure, in the first direction, the height of the second support portion is less than or equal to the height of the mechanical part, so that the second support portion can better provide stable support for the mechanical part. In addition, the influence of the second support portion on the electrode assembly can be reduced, that is, during the assembly process, the second support portion can smoothly contact the mechanical part without interfering with the assembly of the electrode assembly.

[0020] In some embodiments, the second supporting portion includes two portions, and the portions are respectively connected to opposite ends of the first supporting portion along the first direction;

[0021] In the second direction, the thickness of each second supporting portion is greater than the thickness of the first supporting portion.

[0022] Based on this, two second support parts are provided, and the two second support parts can respectively support the lower plastics on opposite sides of the electrode assembly along the first direction, thereby making the arrangement of the electrode assembly and the lower plastic in the shell more stable.

[0023] In some embodiments, the housing assembly further includes a top cover, which is sealed at each opening.

[0024] By providing a top cover, the electrode assembly and the mechanical parts are sealed inside the shell, and the top cover and the shell can jointly protect the electrode assembly and the mechanical parts.

[0025] In a second aspect, the present application further provides a battery cell, comprising:

[0026] The housing assembly as described above has a receiving space formed inside;

[0027] The electrode assembly is accommodated in the accommodation space; and

[0028] The mechanical part is accommodated in the accommodating space and is used for fixed connection with the bottom support plate.

[0029] In some embodiments, the electrode assembly has a positive electrode tab and a negative electrode tab at two opposite ends along the first direction, respectively, and the housing assembly includes a top cover sealed at each opening;

[0030] The positive electrode ear and the negative electrode ear are connected to the corresponding top covers respectively.

[0031] In a third aspect, the present application also provides a battery, comprising the battery cell as described above.

[0032] In a fourth aspect, the present application also provides an electrical device, comprising the battery as described above.

[0033] For the above-mentioned shell assembly, battery cell, battery and electrical device, when the electrode assembly and the mechanical parts are all accommodated in the accommodating space, the bottom support plate supports the electrode assembly and the mechanical parts, and the first support part on the bottom support plate supports the electrode assembly, and the second support part supports the mechanical parts. Since the thicknesses of the first support part and the second support part in the direction intersecting with the first direction are not equal, the first support part and the second support part can respectively adapt to the widths of the electrode assembly and the mechanical parts in the direction intersecting with the first direction. In this way, the bottom support plate can support the electrode assembly and the mechanical parts more stably, so that the electrode assembly and the mechanical parts are maintained at the same height along the direction intersecting with the first direction, reducing the probability of deformation of the bottom support plate under the action of external force, and improving the stability of the overall structure of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural diagram of a battery cell according to one or more embodiments.

[0035] Figure 2 It is a schematic structural diagram of a bottom support plate according to one or more embodiments.

[0036] Figure 3 for Figure 1 A partial enlarged view of point A in the middle.

[0037] Figure 4 It is a schematic structural diagram of a bottom support plate according to one or more embodiments.

[0038] Figure 5 It is a schematic structural diagram of a bottom support plate according to one or more embodiments.

[0039] Figure 6 It is a schematic structural diagram of a bottom support plate according to one or more embodiments.

[0040] Figure 7 It is a schematic structural diagram of a bottom support plate according to one or more embodiments.

[0041] Figure 8 It is a schematic structural diagram of a bottom support plate according to one or more embodiments.

[0042] Explanation of the reference numerals: 100, battery cell; 10, housing assembly; 20, electrode assembly; 30, mechanical part; 11, housing; 12, bottom support plate; 13, accommodating space; 14, top cover; 121, first supporting portion; 122, second supporting portion; a, first direction; b, second 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 of a battery. In the structure of a battery cell, it usually includes a shell component, an electrode component, and other functional components such as mechanical parts. 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 wraps the electrode component to protect it.

[0051] 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.

[0052] Based on this, a bottom support plate structure is usually provided in current battery cells. It should be noted that the battery cell includes a structure with tabs at both ends and a structure with tabs at one end. When the battery cell has a tab at one end, the bottom support plate structure is usually provided at the other end of the electrode assembly opposite to the tab, that is, the tab is provided at one end facing and connected to the top cover, and the other end is provided downward and supported on the support surface. In this way, the bottom support plate structure can support the electrode assembly at the other end opposite to the tab.

[0053] As for the structure with pole ears at both ends, the positive and negative pole ears extend from opposite ends respectively. At this time, mechanical parts need to be respectively arranged at the two ends with positive and negative pole ears, and are used to connect the positive and negative pole ears to the top cover. However, since the width of the mechanical parts is usually not equal to the width of the electrode assembly, there is a difference between the two. At this time, the bottom support plate structure is prone to deformation under the action of external force during the support process, which not only makes the support effect for the electrode assembly and the mechanical parts worse, but also may affect the structure of the electrode assembly.

[0054] Based on the above considerations, in order to solve the problem that the current bottom support plate structure is easily deformed due to external forces during use and has poor supporting stability, a shell assembly is provided in one or more embodiments of the present application. When the electrode assembly and the mechanical parts are both placed in the accommodating space, the bottom support plate supports the electrode assembly and the mechanical parts, and the first supporting portion on the bottom support plate supports the electrode assembly, and the second supporting portion supports the mechanical parts. Since the thicknesses of the first supporting portion and the second supporting portion in the direction intersecting with the first direction are not equal, the first supporting portion and the second supporting portion can respectively adapt to the widths of the electrode assembly and the mechanical parts in the direction intersecting with the first direction. In this way, the bottom support plate can support the electrode assembly and the mechanical parts more stably, so that the electrode assembly and the mechanical parts are kept at the same height along the direction intersecting with the first direction, reducing the probability of deformation of the bottom support plate under the action of external forces and improving the stability of the overall structure of the battery cell.

[0055] See also Figure 1 and Figure 2 An embodiment of the present application provides a housing assembly 10, including a housing 11 and a bottom support plate 12. The housing 11 has a storage space 13 for accommodating an electrode assembly 20 and a mechanical part 30. The housing 11 has openings communicating with the storage space 13 at two opposite ends along a first direction a. The bottom support plate 12 is disposed in the storage space 13 and is located on at least one side of the electrode assembly 20 and the mechanical part 30 along a direction intersecting the first direction a. The bottom support plate 12 has a first support portion 121 for supporting the electrode assembly 20 and a second support portion 122 for supporting the mechanical part 30. In the direction intersecting the first direction a, the thickness of the first support portion 121 is not equal to the thickness of the second support portion 122, so that the electrode assembly 20 and the mechanical part 30 are kept at the same height along the direction intersecting the first direction a.

[0056] It should be noted that the shell 11 refers to a component having a receiving space 13 formed therein, in which the electrode assembly 20 and the mechanical part 30 can be placed, thereby protecting the electrode assembly 20 , the mechanical part 30 and other structures located inside the shell 11 .

[0057] Specifically, the two opposite ends of the shell 11 along the first direction a respectively have two openings connected to the accommodating space 13, that is, the shell 11 is set as a channel structure with openings at both ends. Since the positive pole ear and the negative pole ear of the electrode assembly 20 are respectively formed at the opposite ends of the electrode assembly 20, it is an electrode assembly 20 with pole ears at both ends. Therefore, when the electrode assembly 20 is placed in the accommodating space 13, the positive pole ear and the negative pole ear of the electrode assembly 20 can extend from the two openings at both ends of the shell 11 respectively, and be electrically connected to the pole column on the top cover 14, thereby forming a battery cell 100 structure with pole ears at both ends.

[0058] Further, the bottom support plate 12 is disposed in the accommodation space 13, and the bottom support plate 12 can be disposed on at least one side of the electrode assembly 20 and the mechanical part 30 along a direction intersecting the first direction a. When the electrode assembly 20 is placed in the accommodation space 13, the positive electrode ear and the negative electrode ear extend along the first direction a, that is, the height direction of the electrode assembly 20 is disposed along the first direction a.

[0059] Therefore, the direction intersecting with the first direction a may be the width direction of the electrode assembly 20 or the thickness direction of the electrode assembly 20 .

[0060] That is to say, the bottom support plate 12 can be set on one side or two opposite sides of the electrode assembly 20 along the width direction of the electrode assembly 20, and the bottom support plate 12 can also be set on one side or two opposite sides of the electrode assembly 20 along the thickness direction of the electrode assembly 20. Of course, the bottom support plate 12 can also be set on one side or two opposite sides of the electrode assembly 20 along the width direction and thickness direction of the electrode assembly 20 at the same time, so that the arrangement of the electrode assembly 20 and the mechanical parts 30 inside the shell 11 is more stable.

[0061] Among them, the mechanical part 30 can be but is not limited to being set as a lower plastic, and the lower plastic is set between the electrode assembly 20 and the top cover 14. The lower plastic can not only achieve insulation between the electrode assembly 20 and the top cover 14, but also achieve electrical connection between the pole ear and the pole on the top cover 14.

[0062] However, the size of the lower plastic is often different from that of the electrode assembly 20. Thus, when the battery cell 100 is placed on the support surface, a height difference will be generated between the electrode assembly 20 and the lower plastic along the support direction. At this time, since the thicknesses of the first support portion 121 and the second support portion 122 in the direction intersecting the first direction a, that is, in the support direction of the electrode assembly 20 and the lower plastic are not equal, the thickness of the first support portion 121 can match the distance between the lower plastic and the inner wall of the shell 11, and the thickness of the second support portion 122 can match the distance between the electrode assembly 20 and the inner wall of the shell 11.

[0063] Therefore, the first support part 121 can support the electrode assembly 20 more stably, and the second support part 122 can support the lower plastic more stably, and by setting the thickness difference between the first support part 121 and the second support part 122, after the electrode assembly 20 is supported on the first support part 121 and the lower plastic is supported on the second support part 122, the electrode assembly 20 and the lower plastic can maintain the same height along the supporting direction, that is, the height difference between the electrode assembly 20 and the lower plastic is eliminated, which not only makes the support of the electrode assembly 20 and the mechanical part 30 more stable, but also reduces the probability of deformation of the bottom support plate 12 under the action of external force.

[0064] Through the above structure, when the electrode assembly 20 and the mechanical part 30 are both accommodated in the accommodating space 13, the first support portion 121 on the bottom support plate 12 supports the electrode assembly 20, and the second support portion 122 supports the mechanical part 30. Since the thicknesses of the first support portion 121 and the second support portion 122 in the direction intersecting with the first direction a are not equal, the first support portion 121 and the second support portion 122 can respectively adapt to the widths of the electrode assembly 20 and the mechanical part 30 in the direction intersecting with the first direction a. In this way, the bottom support plate 12 can support the electrode assembly 20 and the mechanical part 30 more stably, so that the electrode assembly 20 and the mechanical part 30 are maintained at the same height along the direction intersecting with the first direction a, reducing the probability of deformation of the bottom support plate 12 under the action of external force, and improving the stability of the overall structure of the battery cell 100.

[0065] In some embodiments, the bottom support plate 12 is disposed on at least one side of the electrode assembly 20 and the mechanical part 30 along the second direction b, and in the second direction b, the thickness of the first support portion 121 is not equal to the thickness of the second support portion 122, so that the electrode assembly 20 and the mechanical part 30 maintain the same height along the second direction b. The second direction b intersects with the first direction a, and when the electrode assembly 20 is located in the accommodating space 13, the width direction of the electrode assembly 20 is disposed along the second direction b.

[0066] It should be noted that, in the structure of the battery cell 100, on the one hand, the electrode assembly 20 and the mechanical part 30 need to be stably accommodated in the accommodating space 13, so as to protect the electrode assembly 20 and the mechanical part 30 through the shell 11. On the other hand, in order to improve the energy density of the battery cell 100, it is also necessary to increase the number of pole pieces in the electrode assembly 20 as much as possible, that is, to form a larger space inside the shell 11 for accommodating the electrode assembly 20.

[0067] Based on this, when the electrode assembly 20 is located in the accommodation space 13, the width direction of the electrode assembly 20 is arranged along the second direction b, and the bottom support plate 12 is arranged along the second direction b on at least one side of the electrode assembly 20 and the mechanical part 30. That is, the bottom support plate 12 is located on at least one side of the electrode assembly 20 and the mechanical part 30 along the width direction of the electrode assembly 20.

[0068] Therefore, the bottom support plate 12 can support the electrode assembly 20 and the mechanical parts 30 along the width direction of the electrode assembly 20, so that more installation space can be formed in the thickness direction of the electrode assembly 20, that is, between the large surface side of the electrode assembly 20 and the inner wall of the shell 11, which can accommodate more pole pieces.

[0069] Further, the bottom support plate 12 can be arranged on one side of the electrode assembly 20 and the mechanical part 30 along the second direction b, or can be arranged on opposite sides of the electrode assembly 20 and the mechanical part 30 along the second direction b. When the bottom support plate 12 is arranged on one side of the electrode assembly 20 and the mechanical part 30 along the second direction b, the height difference between the first support portion 121 and the second support portion 122 along the second direction b is equal to the total height difference between the electrode assembly 20 and the mechanical part 30 in the second direction b. Thus, the first support portion 121 and the second support portion 122 can respectively realize stable support of the electrode assembly 20 and the mechanical part 30, and keep the electrode assembly 20 and the mechanical part 30 at the same height.

[0070] In addition, when the bottom support plate 12 is arranged on the opposite sides of the electrode assembly 20 and the mechanical part 30 along the second direction b, the bottom support plate 12 includes two, and the sum of the height differences between the first support portion 121 and the second support portion 122 on each bottom support plate 12 along the second direction b is equal to the total height difference between the electrode assembly 20 and the mechanical part 30 in the second direction b.

[0071] Through the above structure, the bottom support plate 12 supports the electrode assembly 20 and the mechanical parts 30 along the width direction of the electrode assembly 20. On the basis of achieving stable support for the electrode assembly 20 and the mechanical parts 30, more installation space can be released for the electrode assembly 20, and the energy density of the battery cell 100 can be improved.

[0072] In some embodiments, in the second direction b, the thickness of the second support portion 122 is greater than the thickness of the first support portion 121 .

[0073] Specifically, the width of the mechanical part 30 (i.e., the lower plastic) in the second direction b is often smaller than the width of the electrode assembly 20. Therefore, in the second direction b, setting the thickness of the second support portion 122 to be greater than the thickness of the first support portion 121 enables the first support portion 121 to better support the electrode assembly 20, the second support portion 122 to better support the mechanical part 30, and enables the electrode assembly 20 and the mechanical part 30 to maintain the same height along the second direction b, thereby reducing the probability of deformation of the bottom support plate 12 under the action of external force.

[0074] Please also see Figure 1 and Figure 3 In some embodiments, in the second direction b, the thickness of the first support portion 121 is L1, the thickness of the second support portion 122 is L2, the width of the electrode assembly 20 is L3, and the width of the mechanical part 30 is L4. Wherein, L2-L1=(L3-L4) / 2.

[0075] Through the above structure, the first support part 121 can better support the electrode assembly 20, the second support part 122 can better support the mechanical part 30, and the electrode assembly 20 and the mechanical part 30 can be kept at the same height along the second direction b, reducing the probability of deformation of the bottom support plate 12 under the action of external force.

[0076] In some embodiments, in the first direction a, the height of the second support portion 122 is H1, and the height of the mechanical component 30 is H2, wherein H1≤H2.

[0077] Through the above structure, in the first direction a, the height of the second support portion 122 is less than or equal to the height of the mechanical part 30, so that the second support portion 122 can better provide stable support for the mechanical part 30. In addition, the influence of the second support portion 122 on the electrode assembly 20 can be reduced, that is, during the assembly process, the second support portion 122 can smoothly contact the mechanical part 30 without interfering with the assembly of the electrode assembly 20.

[0078] like Figure 4 As shown, further, in the first direction a, when the height of the second support portion 122 is equal to the height of the mechanical part 30, that is, H1=H2, the second support portion 122 is configured as a fully covered rectangular structure to improve the supporting effect for the mechanical part 30.

[0079] like Figure 5-Figure 8 As shown, in the first direction a, when the height of the second support portion 122 is less than the height of the mechanical part 30, that is, when H1<H2, the second support portion 122 can be set as a partially covered structure. For example, the second support portion 122 can be set as one or more long strip structures, each of which is extended along the thickness direction of the electrode assembly 20 and is arranged at intervals along the first direction a. The second support portion 122 can also be set as a square-shaped ring structure, or as a C-shaped structure, or as a rectangular block structure arranged at intervals along the thickness direction of the electrode assembly 20.

[0080] The above structures can realize the supporting function of the second supporting portion 122 for the mechanical part 30 . It can be understood that the second supporting portion 122 can also be set as other structures that can realize the supporting function, which will not be elaborated here.

[0081] In some embodiments, the second support portion 122 includes two parts, which are respectively connected to opposite ends of the first support portion 121 along the first direction a. In the second direction b, the thickness of each second support portion 122 is greater than the thickness of the first support portion 121 .

[0082] When the positive tab and the negative tab of the electrode assembly 20 extend from opposite ends of the electrode assembly 20 along the first direction a, lower plastics need to be provided on the positive tab side and the negative tab side of the electrode assembly 20 to achieve insulation and connection between the tabs and the top cover 14 through the lower plastics.

[0083] Based on this, two second support parts 122 are provided, and the two second support parts 122 can respectively support the lower plastics on opposite sides of the electrode assembly 20 along the first direction a, thereby making the arrangement of the electrode assembly 20 and the lower plastics in the shell 11 more stable.

[0084] In addition, in the assembly process of the battery cell 100, in order to make the support between the bottom support plate 12, the electrode assembly 20 and the mechanical part 30 more stable, the bottom support plate 12 and the mechanical part 30 are usually fixed by welding. That is, the second support portion 122 of the bottom support plate 12 and the mechanical part 30 are fixed by welding, so that the electrode assembly 20, the mechanical part 30 and the bottom support plate 12 can be more stable.

[0085] Please see again Figure 1 In some embodiments, the housing assembly 10 further includes a top cover 14, and the top cover 14 is sealed and disposed on each opening.

[0086] Specifically, the top cover 14 includes two, and the two openings of the housing 11 are sealed respectively. The top cover 14 has a pole, and the positive pole ear of the electrode assembly 20 is connected to the pole on the top cover 14, thereby forming a positive pole. The negative pole ear of the electrode assembly 20 is connected to the pole on the top cover 14, thereby forming a negative pole. In this way, the battery cell 100 structure with pole ears at both ends can be realized.

[0087] By providing the top cover 14 , the electrode assembly 20 and the mechanical component 30 are sealed inside the shell 11 . The top cover 14 and the shell 11 can jointly protect the electrode assembly 20 and the mechanical component 30 .

[0088] like Figure 1 As shown, based on the same concept as the above-mentioned shell assembly 10, the present application also provides a battery cell 100, including an electrode assembly 20, a mechanical part 30 and the shell assembly 10 as described above, a receiving space 13 is formed inside the shell assembly 10, the electrode assembly 20 is received in the receiving space 13, the mechanical part 30 is received in the receiving space 13, and is used to be fixedly connected to the bottom support plate 12.

[0089] Specifically, the second support portion 122 of the bottom supporting plate 12 is welded to the mechanical component 30 , so that the mechanical component 30 and the bottom supporting plate 12 are fixedly connected by welding.

[0090] In some embodiments, the electrode assembly 20 has a positive electrode tab and a negative electrode tab at opposite ends along the first direction a, respectively, and the housing assembly 10 includes a top cover 14 sealed at each opening. The positive electrode tab and the negative electrode tab are connected to the corresponding top cover 14, respectively.

[0091] When the electrode assembly 20 is placed in the accommodating space 13, the positive electrode ear of the electrode assembly 20 extends from one of the openings of the shell 11 and is connected to the top cover 14 on this side through the lower plastic, and the negative electrode ear extends from the other opening of the shell 11 and is connected to the top cover 14 on the other side through the lower plastic, thereby realizing the electrical connection between the electrode assembly 20 and the top cover 14.

[0092] 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 .

[0093] Based on the same concept as the above-mentioned battery, the present application also provides an electrical device, including the above-mentioned battery.

[0094] According to one or more embodiments, during the assembly of the battery cell 100, the electrode assembly 20 is placed in the receiving space 13 of the housing 11, and then the lower plastic is placed at the opposite ends of the electrode assembly 20 along the first direction a, so that the lower plastic is located at the openings on both sides of the housing 11. At the same time, the bottom support plate 12 is placed in the receiving space 13, so that the first support portion 121 of the bottom support plate 12 is correspondingly arranged with the electrode assembly 20, the second support portion 122 is correspondingly arranged with the lower plastic, and the second support portion 122 is connected to the lower plastic by welding.

[0095] Furthermore, a top cover 14 is sealed at the opening of the shell 11 , the positive electrode ear of the electrode assembly 20 is electrically connected to the top cover 14 at one opening, and the negative electrode ear is electrically connected to the top cover 14 at the other opening, thereby realizing the assembly of the battery cell 100 .

[0096] When the battery cell 100 is placed on the support surface, the first support portion 121 supports the electrode assembly 20, and the second support portion 122 supports the lower plastic, so that the electrode assembly 20 and the lower plastic maintain the same height in the support direction, which not only improves the support stability of the electrode assembly 20 and the lower plastic, but also reduces the probability of deformation of the bottom support plate 12 under the action of external force.

[0097] 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.

[0098] 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 shell having a storage space for storing the electrode assembly and the mechanical parts, and two opposite ends of the shell along the first direction respectively have openings communicating with the storage space; and a bottom support plate, disposed in the accommodation space and located on at least one side of the electrode assembly and the mechanical part along a direction intersecting the first direction, the bottom support plate having a first support portion for supporting the electrode assembly and a second support portion for supporting the mechanical part; Wherein, in a direction intersecting with the first direction, the thickness of the first support portion is not equal to the thickness of the second support portion, so that the electrode assembly and the mechanical part maintain the same height along the direction intersecting with the first direction.

2. The housing assembly according to claim 1, characterized in that The bottom support plate is disposed on at least one side of the electrode assembly and the mechanical part along the second direction, and in the second direction, the thickness of the first support portion is not equal to the thickness of the second support portion, so that the electrode assembly and the mechanical part are kept at the same height along the second direction; The second direction intersects with the first direction, and when the electrode assembly is located in the accommodation space, the width direction of the electrode assembly is arranged along the second direction.

3. The housing assembly according to claim 2, characterized in that In the second direction, the thickness of the second supporting portion is greater than the thickness of the first supporting portion.

4. The housing assembly according to claim 3, characterized in that: In the second direction, the thickness of the first support portion is L1, the thickness of the second support portion is L2, the width of the electrode assembly is L3, and the width of the mechanical part is L4; Among them, L2-L1=(L3-L4) / 2.

5. The housing assembly according to claim 3 or 4, characterized in that: In the first direction, the height of the second supporting portion is H1, and the height of the mechanical component is H2, wherein H1≤H2.

6. The housing assembly according to claim 5, characterized in that The second supporting parts include two parts, and are respectively connected to opposite ends of the first supporting part along the first direction; Wherein, in the second direction, the thickness of each of the second supporting portions is greater than the thickness of the first supporting portion.

7. The housing assembly according to claim 1, wherein: The housing assembly further comprises a top cover, and the top cover is respectively and sealingly disposed on each of the openings.

8. A battery cell, characterized in that: include: The housing assembly according to any one of claims 1 to 7, wherein a receiving space is formed inside; An electrode assembly is accommodated in the accommodation space; and The mechanical part is accommodated in the accommodating space and is used for being fixedly connected with the bottom supporting plate.

9. The battery cell according to claim 8, characterized in that: The electrode assembly has a positive electrode ear and a negative electrode ear at two opposite ends along the first direction, and the housing assembly includes a top cover sealed at each of the openings; Wherein, 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.

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