Shell assembly and battery

Abstract

The utility model belongs to the technical field of electric energy storage, and discloses a shell assembly and a battery. The shell assembly comprises a shell body, a fixing piece and a connecting piece, and a through hole is formed in the top of the shell body; the fixing piece comprises a first fixing part and a second fixing part, the first fixing part is arranged on the outward wall face of the shell body and provided with a containing groove, and the second fixing part is arranged in the shell body. The connecting piece is arranged in the containing groove in an interference fit mode, the electrode lug is located in the shell body and arranged on the second fixing part, and a part of the structure of the electrode lug can penetrate through the through hole and be turned over to the outer side of the shell body to be electrically connected with the connecting piece. According to the utility model, the connecting piece and the partial structure of the tab are positioned outside the shell body, so that the space utilization rate in the battery is improved, and meanwhile, the connecting piece is fixed in the accommodating groove in an interference fit manner, so that the use of fixing parts is reduced, the fixing manner is simplified, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric energy storage, especially relates to a shell assembly and a battery. BACKGROUND

[0002] In the energy storage system, the battery as a kind of energy device is widely used in mobile phone, electric vehicle and electric tool etc.

[0003] Please refer to the attached Figure 1 -attached Figure 4 The prior art provides a battery, the battery includes positive electrode assembly 10 and negative electrode assembly 20, wherein positive electrode assembly 10 includes positive electrode connecting piece 11 and positive electrode lug 12, and negative electrode assembly 20 includes negative electrode connecting piece 21 and negative electrode lug 22.Positive electrode connecting piece 11, positive electrode lug 12, negative electrode connecting piece 21 and negative electrode lug 22 are all located inside the shell 30 of battery, and positive electrode connecting piece 11 is electrically connected with positive electrode lug 12, and negative electrode connecting piece 21 is electrically connected with negative electrode lug 22. Among them, the first plastic piece 32 located on the outer side of the cover plate 31 of shell 30 and the second plastic piece 33 located on the inner side of cover plate 31 are used to provide sealing effect and insulation effect for the electric connection structure of battery.

[0004] The traditional battery reduces the space utilization of the battery interior because all structures of connecting piece and lug are arranged inside the battery. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of shell assembly and battery, for improving the space utilization of battery interior.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Shell assembly, comprising:

[0008] Shell body, the top of the shell body is provided with through-hole;

[0009] Fixed piece, the fixed piece includes first fixed part and second fixed part, the first fixed part is located on the wall surface of the shell body outward and the first fixed part is provided with accommodating groove, and the second fixed part is placed inside the shell body;

[0010] Connecting piece, the connecting piece is arranged in the accommodating groove by interference fit, lug located inside the shell body, is arranged on the second fixed part, part of structure of the lug can pass through the through-hole and be folded to the outside of the shell body, and is electrically connected with the connecting piece.

[0011] As an optional scheme of a kind of shell assembly, the interference amount of cooperation between the connecting piece and the accommodating groove is δ, wherein δ is 0.05mm~0.3mm.

[0012] As an optional solution of the shell assembly, the outer edge of the connecting piece and / or the inner wall of the accommodating groove is provided with a plurality of interference ribs.

[0013] As an optional solution of the shell assembly, the interference rib is a strip-shaped structure extending along the depth direction of the accommodating groove, and the stress surface of the interference rib is a circular arc.

[0014] As an optional solution of the shell assembly, the interference rib is located on the inner wall of the accommodating groove, and an inclined surface is arranged at the end of the interference rib away from the bottom wall of the accommodating groove, the inclined surface extending obliquely towards the bottom wall of the accommodating groove along the groove opening.

[0015] As an optional solution of the shell assembly, the shell body is provided with a mounting hole, and the shell assembly further comprises an explosion-proof valve arranged in the mounting hole, the explosion-proof valve being provided with a score for pressure relief, the score being arranged on the side of the explosion-proof valve facing the interior of the shell body or on the side of the explosion-proof valve away from the interior of the shell body.

[0016] As an optional solution of the shell assembly, the shell body is provided with a limiting groove, and the circumferential direction of the first fixing part is provided with a limiting structure, the limiting structure and the limiting groove being matched to realize the positioning of the first fixing part relative to the shell body.

[0017] As an optional solution of the shell assembly, the first fixing part and the second fixing part are an integral structure or a split structure.

[0018] As an optional solution of the shell assembly, the distance from the bottom wall of the accommodating groove to the top wall of the shell body is β, the thickness of the shell body is λ, λ is 1.2mm-1.8mm, when the bottom wall of the accommodating groove is higher than the top wall of the shell body, wherein β is not greater than λ; when the bottom wall of the accommodating groove is lower than the top wall of the shell body, wherein β is not greater than 0.5λ.

[0019] The battery comprises a battery cell and a shell assembly and a tab according to any one of the above solutions, and the battery cell is arranged in the interior of the shell body.

[0020] Advantages:

[0021] In the first aspect of the utility model, the electric core is arranged in the shell body, the through hole is used for the tab inside the shell body to pass out, the first fixed part and the second fixed part are located on the two sides of the upper top cover, further, the first fixed part is provided with the accommodating groove, the connecting piece is arranged in the accommodating groove, the accommodating groove provides the positioning and installation space for the connecting piece, the connecting piece is fixed through the interference fit with the accommodating groove, the tab can be directly arranged on the second fixed part and located between the second fixed part and the electric core, part of structure of the tab is led out to the outside of the shell body through the through hole and is electrically connected with the connecting piece.

[0022] In the second aspect of the utility model, the battery based on the shell assembly can effectively improve the space utilization rate inside the battery. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the sectional view of the battery provided by the prior art;

[0024] Figure 2 It is the first plastic piece, the second plastic piece and the cover plate assembly of the battery provided by the prior art are axonometric view;

[0025] Figure 3 It is the first plastic piece, the second plastic piece and the cover plate assembly of the battery provided by the prior art are plan view;

[0026] Figure 4 It is the first plastic piece, the second plastic piece and the cover plate assembly of the battery provided by the prior art are sectional view;

[0027] Figure 5 The first perspective exploded view of the shell assembly provided by the utility model embodiment;

[0028] Figure 6 The first perspective axonometric view of the shell assembly provided by the utility model embodiment;

[0029] Figure 7 The second perspective exploded view of the shell assembly provided by the utility model embodiment;

[0030] Figure 8 The second perspective axonometric view of the shell assembly provided by the utility model embodiment;

[0031] Figure 9 The exploded structural schematic diagram of the fixing piece provided by the utility model embodiment;

[0032] Figure 10The overhead view of the shell assembly is provided by the embodiment of the utility model.

[0033] Figure 11 Is Figure 10 The sectional view at A-A section;

[0034] Figure 12 Is Figure 11 The local enlarged view at D;

[0035] Figure 13 Is Figure 11 The local enlarged view at E;

[0036] Figure 14 Is Figure 11 The sectional view at B-B section;

[0037] Figure 15 Is Figure 14 The sectional view at C-C section;

[0038] Figure 16 Is Figure 15 The local enlarged view at F.

[0039] In the figure:

[0040] 10, positive electrode assembly; 11, positive electrode connecting piece; 12, positive electrode lug; 20, negative electrode assembly; 21, negative electrode connecting piece; 22, negative electrode lug; 30, shell; 31, cover plate; 32, first plastic piece; 33, second plastic piece;

[0041] 100, shell body; 110, upper cover; 111, through hole; 112, mounting hole; 113, limiting groove; 114, liquid injection hole;

[0042] 200, fixing piece; 210, first fixing part; 211, accommodating groove; 212, interference rib; 213, limiting structure; 214, lead-out hole; 220, second fixing part; 221, opening;

[0043] 300, connecting piece;

[0044] 400, explosion-proof valve. DETAILED DESCRIPTION

[0045] The utility model will be further explained in detail in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0046] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's interaction relationship.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0047] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0048] In the description of the embodiment, the terms "on", "under", "right", etc. Orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0049] Please refer to the accompanying Figure 5 -attached Figure 9 The first aspect of the embodiment relates to a shell assembly for covering an electric core assembled into a battery to provide insulation and protection.

[0050] The shell assembly includes a shell body 100, a fixing piece 200 and a connecting sheet 300.The shell body 100 includes an upper top cover 110, and the upper top cover 110 is provided with a through hole 111;The fixing piece 200 includes a first fixing part 210 and a second fixing part 220, the first fixing part 210 is arranged on the outer wall surface of the upper top cover 110, and the first fixing part 210 is provided with a containing groove 211, and the second fixing part 220 is arranged inside the shell body 100;The connecting sheet 300 is arranged in the containing groove 211 through interference fit, the tab inside the shell body 100 is arranged on the second fixing part 220, part of the structure can pass through the through hole 111 and fold to the outside of the shell body 100, and is electrically connected with the connecting sheet 300.

[0051] The shell body 100 is a cuboid structure as a whole, and the shell body 100 includes an outer shell wrapped around the four sides of the cuboid battery in the circumferential direction and an upper top cover 110 located at the top of the outer shell. It can be understood that the shell body 100 can be a one-piece structure or a split structure, that is, the upper top cover 110 is directly formed with the outer shell of the shell body 100 by using a one-piece forming process, or the upper top cover 110 is fixed to the outer shell of the shell body 100 by using clamping or adhesion as a separate part. When the shell body 100 is a split structure, the upper top cover 110 is an aluminum plate with a smooth surface, which can ensure strength while reducing weight. In addition, the battery cell is arranged in the shell body 100, and a complete packaging process is performed to form a cuboid battery. The upper top cover 110 is provided with a long hole 111, and the long hole 111 can be used for the tab inside the shell body 100 to pass out, so the shape of the long hole 111 is adapted to the profile of the lead-out part of the tab, and the number of long holes 111 matches the number of tabs.

[0052] The fixing member 200 is a non-metal plastic material, and the fixing member 200 includes two parts, specifically a first fixing part 210 and a second fixing part 220. The first fixing part 210 and the second fixing part 220 are located on both sides of the upper top cover 110, that is, the outer wall surface and the inner wall surface of the upper top cover 110. Further, the first fixing part 210 is provided with a receiving groove 211, and the connecting piece 300 is arranged in the receiving groove 211. The receiving groove 211 provides a positioning and mounting space for the connecting piece 300, and the connecting piece 300 is fixed by interference fit with the receiving groove 211. The tab can be directly arranged on the second fixing part 220 and located between the second fixing part 220 and the battery cell. Part of the structure of the tab is led out to the outside of the shell body 100 through the long hole 111 and electrically connected with the connecting piece 300.

[0053] By using the shell assembly, the connecting piece 300 and part of the structure of the tab are located outside the shell body 100, avoiding the arrangement inside in the prior art, improving the space utilization rate inside the battery, and the connecting piece 300 is fixed in the receiving groove 211 by interference fit, reducing the use of fixing parts, simplifying the fixing method, and reducing the cost.

[0054] Optionally, the outer edge of the connecting piece 300 and / or the inner wall of the receiving groove 211 is provided with a plurality of interference ribs 212.

[0055] In the embodiment, the connecting piece 300 is a quadrilateral structure, and the accommodating groove 211 is also a quadrilateral groove structure, and the two are in interference fit through the setting of a plurality of interference ribs 212. In the embodiment, the interference ribs 212 are arranged on the accommodating groove 211. Specifically, four strip-shaped interference ribs 212 are arranged on each of the two opposite side walls of the accommodating groove 211. The interference ribs 212 extend along the depth direction of the accommodating groove 211 and are in the form of vertical strips. The interference ribs 212 can also be in the form of waves or inclined shapes extending along the depth direction, or can be arranged along the horizontal direction. In other embodiments, the interference ribs 212 can be arranged on the outer edge of the connecting piece 300 or on the inner wall of the accommodating groove 211.

[0056] Please refer to the further combination of the accompanying drawings Figure 5 , the accompanying drawings Figure 14 - the accompanying drawings Figure 16 Further, based on the reliability, economy and convenience of assembly, the interference amount δ in the embodiment is preferably 0.05mm-0.3mm. If the interference amount δ is lower than the range, the interference connection is not firm enough. If the interference amount δ is higher than the range, the difficulty of assembly increases accordingly, and damage to the fit may occur, resulting in cost waste.

[0057] Optionally, the interference rib 212 is in the form of a strip extending along the depth direction of the accommodating groove 211, and the stress surface of the interference rib 212 is in the form of a circular arc.

[0058] In the embodiment, the interference rib 212 is arranged on the inner wall of the accommodating groove 211 and is in the form of a long strip. The end of the interference rib 212 away from the top surface of the inner wall of the accommodating groove 211, i.e. the extrusion surface for extrusion fit with the connecting piece 300, is in the form of a circular arc. The circular arc-shaped extrusion surface can ensure that the pressure on the side wall of the connecting piece 300 is reduced during the interference fit installation, and the risk of surface bruising of the connecting piece 300 is reduced. On the other hand, the assembly of the connecting piece 300 and the inner wall of the accommodating groove 211 is also facilitated.

[0059] Further, the interference rib 212 is arranged on the inner wall of the accommodating groove 211, and the end of the interference rib 212 away from the bottom wall of the accommodating groove 211 is provided with an inclined surface extending obliquely towards the bottom wall of the accommodating groove 211 along the groove opening of the accommodating groove 211.

[0060] In the embodiment, the interference rib 212 is away from the bottom wall of the accommodating groove 211, and is used to guide the interference fit between the connecting piece 300 and the inner wall of the accommodating groove 211, so that the interference fit between the connecting piece 300 and the inner wall of the accommodating groove 211 is facilitated, the assembly difficulty is reduced, and the assembly efficiency is improved.

[0061] Optionally, the number of the first fixing parts 210 is matched with the number of the electrodes.

[0062] In the embodiment, the first fixing parts 210 are two, which are respectively matched with the positive electrode and the negative electrode of the battery. Of course, in other embodiments, the number of the first fixing parts 210 can be flexibly adjusted according to the number of the electrodes.

[0063] Optionally, the second fixing part 220 is a plate-shaped piece, and the second fixing part 220 is provided with an opening 221 communicating with the through hole 111, and the tab can pass through the opening 221 and the through hole 111 in sequence.

[0064] In the embodiment, the second fixing part 220 is a rectangular plate-shaped piece, which can be matched with the shape of the inner cavity of the shell body 100. The tab is partially arranged in the inner cavity of the shell body 100, and the other part passes through the strip-shaped opening 221 on the second fixing part 220 and is led out of the shell body 100 through the through hole 111. Further, the first fixing part 210 is further provided with a leading-out hole 214 opposite to the through hole 111. The part of the tab passing through the through hole 111 is electrically connected to the connecting piece 300 through the leading-out hole 214, and the leading-out hole 214 has a certain avoiding effect.

[0065] Optionally, the shell body 100 is provided with a mounting hole 112, and the shell assembly further comprises an explosion-proof valve 400 arranged in the mounting hole 112. The explosion-proof valve 400 is provided with a notch for pressure relief, and the notch is arranged on the side of the explosion-proof valve 400 facing the inside of the shell body 100 or on the side of the explosion-proof valve 400 away from the inside of the shell body 100.

[0066] In this embodiment, the shape of the mounting hole 112 is adapted to the structure of the explosion-proof valve 400, the mounting hole 112 is provided between the positive and negative electrodes of the upper top cover 110, the mounting hole 112 is provided with a cross-shaped support rib for supporting the explosion-proof valve 400, and a connecting table with a certain length is protruded inwardly from the circumferential inner wall of the mounting hole 112 for further supporting the explosion-proof valve 400. The explosion-proof valve 400 is also provided with score lines for pressure relief, which are formed by stamping during the manufacturing process. These score lines play a key role when the battery encounters abnormal conditions such as overcharging, overdischarging, short circuit, etc. Specifically, they relieve internal pressure, when the internal pressure of the battery rises sharply due to abnormal conditions, the score line area on the explosion-proof valve 400 will first be subjected to pressure and deform, thereby helping to relieve the internal pressure of the battery; release gas, as the internal pressure continues to rise, the explosion-proof valve 400 will rupture at the score line, releasing the accumulated gas inside the battery to prevent the battery from exploding or catching fire; improve safety, the design of the score lines is carefully calculated and experimentally verified, their depth, shape and position are strictly considered to ensure that they can safely and effectively release pressure in emergency situations, protecting the safety of the battery and the user. In summary, the score lines on the explosion-proof valve 400 are one of the important designs to ensure the safety of the battery, they prevent the battery from exploding or catching fire in abnormal conditions by relieving internal pressure and releasing gas.

[0067] Optionally, the shell body 100 is provided with a limiting groove 113, and the circumferential direction of the first fixing part 210 is provided with a limiting structure 213, which realizes the positioning of the first fixing part 210 relative to the upper top cover 110 through cooperation of the limiting structure 213 and the limiting groove 113.

[0068] Please further combine the attached Figure 5 , attached Figure 10 - attached Figure 13 In this embodiment, the upper top cover 110 is provided with a limiting groove 113 matched with the shape of the first fixing part 210, which is a quadrilateral, wherein the outer circumference of the first fixing part 210 is provided with a limiting structure 213 with a certain height, which can be a flange table, and the cooperation of the flange table and the limiting groove 113 realizes the positioning of the first fixing part 210 relative to the upper top cover 110, thereby ensuring the reliable positioning of the first fixing part 210.

[0069] In this embodiment, the width dimension α of the limiting structure 213 is 1mm-10mm, the limiting structure 213 with too small width dimension α is not convenient to fix, and the limiting structure 213 with too large width dimension α will increase the material and cost, and also affect the structure and weight of the whole shell assembly.

[0070] In another aspect, as preferred, the distance from the bottom wall of the accommodating groove 211 to the top wall of the shell body 100 is β, the thickness of the shell body 100 is λ, λ is 1.2mm-1.8mm, when the bottom wall of the accommodating groove 211 is higher than the top wall of the shell body 100, wherein β is not greater than λ; but when the bottom wall of the accommodating groove 211 is lower than the top wall of the shell body 100, wherein β is not greater than 0.5λ. In the present embodiment, β needs to be limited within a certain range, because if the bottom wall of the accommodating groove 211 is too high to the top surface of the upper top cover 110, it is easy to cause material and weight increase, cost increase; if the bottom wall of the accommodating groove 211 is too low to the top surface of the upper top cover 110, it causes the strength of the whole shell assembly to be reduced, which is not recommended.

[0071] Optionally, the first fixing part 210 and the second fixing part 220 are an integral structure or a split structure.

[0072] In the present embodiment, if the first fixing part 210 and the second fixing part 220 are a split structure, an upper plastic structure located outside the upper top cover 110 and a lower plastic structure located inside the upper top cover 110 can be formed; if the first fixing part 210 and the second fixing part 220 are an integral structure, an integral molding can be adopted by insert injection molding. Those skilled in the art can make targeted selection according to economy.

[0073] Optionally, the shell body 100 is also provided with a liquid injection hole 114, which is located between the positive electrode and the negative electrode.

[0074] The most direct function of the battery liquid injection hole 114 is to allow electrolyte to be injected into the battery. The electrolyte is a key component in the battery for transferring ions, which has a direct impact on the performance and life of the battery. In addition, during the use of the battery, due to various reasons (such as electrolyte evaporation, leakage, etc.), it may be necessary to supplement the electrolyte. At this time, the liquid injection hole 114 provides a convenient way to supplement, which helps to prolong the service life of the battery. At the same time, in the process of battery maintenance or modification, the liquid injection hole 114 is also an important channel for internal inspection and adjustment. In some types of batteries, especially in batteries that may generate gas during charging and discharging (such as lead-acid batteries), the liquid injection hole 114 is also used to discharge these gases to prevent the internal pressure of the battery from being too high, ensuring the safe operation of the battery. In some advanced battery management systems, the liquid injection hole 114 can also be designed as a location convenient for installing sensors or sampling points, so as to monitor the state of the electrolyte (such as concentration, temperature, etc.) inside the battery in real time, thereby realizing precise control and optimization of the performance of the battery.

[0075] The second aspect of the present embodiment also relates to a battery, which comprises a battery core, the above shell assembly and a tab, and the battery core is arranged inside the shell body 100.

[0076] In the embodiment, the battery based on the shell assembly can effectively improve the space utilization inside the battery.

[0077] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A housing assembly, characterized in that: include: A housing body (100), wherein a through hole (111) is provided on the top of the housing body (100); A fixing member (200), the fixing member (200) comprising a first fixing portion (210) and a second fixing portion (220), the first fixing portion (210) being arranged on an outwardly facing wall surface of the shell body (100) and having an accommodating groove (211), and the second fixing portion (220) being arranged inside the shell body (100); A connecting piece (300) is arranged in the accommodating groove (211) by interference fit, and a pole ear located inside the shell body (100) is provided on the second fixing portion (220), and a part of the structure of the pole ear can pass through the through hole (111) and be folded to the outside of the shell body (100) to be electrically connected to the connecting piece (300).

2. The housing assembly according to claim 1, wherein: The interference fit between the connecting piece (300) and the accommodating groove (211) is δ, wherein δ is 0.05 mm to 0.3 mm.

3. The housing assembly according to claim 1, wherein: A plurality of interference ribs (212) are protrudingly provided on the outer edge of the connecting piece (300) and / or the inner wall of the accommodating groove (211).

4. The housing assembly according to claim 3, wherein: The interference rib (212) is a strip-shaped structure extending along the depth direction of the accommodating groove (211), and the force-bearing surface of the interference rib (212) is arc-shaped.

5. The housing assembly according to claim 3, wherein: The interference rib (212) is located on the inner wall of the accommodating groove (211), and an end of the interference rib (212) away from the bottom wall of the accommodating groove (211) is provided with an inclined surface, and the inclined surface extends obliquely along the notch of the accommodating groove (211) toward the bottom wall of the accommodating groove (211).

6. The housing assembly according to any one of claims 1 to 5, characterized in that: The shell body (100) is provided with a mounting hole (112), and the shell assembly further includes an explosion-proof valve (400), the explosion-proof valve (400) is arranged in the mounting hole (112), and the explosion-proof valve (400) is provided with a notch for pressure relief, and the notch is provided on the side of the explosion-proof valve (400) facing the interior of the shell body (100) or on the side of the explosion-proof valve (400) facing away from the interior of the shell body (100).

7. The housing assembly according to any one of claims 1 to 5, characterized in that: The shell body (100) is provided with a limiting groove (113), and a limiting structure (213) is provided in the circumference of the first fixing portion (210). The limiting structure (213) cooperates with the limiting groove (113) to achieve positioning of the first fixing portion (210) relative to the shell body (100).

8. The housing assembly according to any one of claims 1 to 5, characterized in that: The first fixing portion (210) and the second fixing portion (220) are an integrated structure or a split structure.

9. The housing assembly according to any one of claims 1 to 5, characterized in that: The distance from the bottom wall of the accommodating groove (211) to the top wall of the shell body (100) is β, the thickness of the shell body (100) is λ, and λ is 1.2 mm to 1.8 mm. When the bottom wall of the accommodating groove (211) is higher than the top wall of the shell body (100), β is not greater than λ; when the bottom wall of the accommodating groove (211) is lower than the top wall of the shell body (100), β is not greater than 0.5λ.

10. A battery comprising a cell, characterized in that: It also includes the shell assembly and the tab according to any one of claims 1 to 9, and the battery core is arranged inside the shell body (100).

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