Shell, battery cell, battery system and electric equipment

Abstract

The utility model provides a shell, which is used for a battery cell and is characterized in that the shell comprises a shell main body and a cover plate, the cover plate comprises a covering part and an embedding part, the edge of one side surface, contacted with a shell opening, of the covering part of the cover plate is provided with a first inclined surface, the edge of the shell opening of the shell main body is provided with a second inclined surface, and the embedding part is embedded into the first inclined surface. The first inclined surface of the cover plate is attached to the second inclined surface of the shell main body, the embedded part of the cover plate and the first inclined surface of the cover plate respectively form constraint on the shell main body from the inside and the outside of the shell main body, and the constraint is suitable for a welding process of the shell main body and the cover plate. According to the scheme, the first inclined plane and the second inclined plane are matched with each other and jointly form constraint with the embedded part, so that the unilateral gap of the shell cover is reduced, the consistency of the unilateral gap matched with the shell cover is improved, and the yield of the shell cover welding procedure is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a shell for a battery core. Background Art

[0002] The current structural conditions of the battery cell shell body and the cover plate are as follows: the cover plate achieves the shell entry effect through the chamfering of the bottom, the shell body and the cover plate are clearance fit, the shell mouth of the aluminum shell is easily scratched and deformed by the cover plate, the thickness of the aluminum shell is normally only 0.3mm~0.5mm, the shell cover is mainly matched through the inner circle of the shell body and the end face of the shell mouth to match the step of the cover plate for limiting, and aluminum has good ductility. The outer circle of the aluminum shell body has no limit, and the shell mouth is prone to be higher than the side of the cover plate, which leads to the shell cover gap being too large and unable to fusion or weld holes during welding, resulting in low yield of the shell cover welding process. Utility Model Content

[0003] The utility model provides a shell, which provides a first inclined surface on the edge of the covering plane of the cover plate and a second inclined surface on the outer ring of the shell opening of the shell body, the first inclined surface and the second inclined surface cooperate with each other and form a constraint together with the embedded part, thereby solving the problem that the outer ring part of the aluminum shell body has no unlimited position, which leads to excessive gap between the shell cover and the failure to fuse or the appearance of welding holes during welding, resulting in low yield of the shell cover welding process.

[0004] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0005] According to a first aspect of the utility model, a shell is provided for a battery cell, the shell comprising a shell body and a cover plate, the cover plate comprising a covering portion and an embedding portion;

[0006] The embedded part is the part of the cover plate inserted into the inner cavity of the shell body from the shell opening of the shell body, and the covering part is the part of the cover plate except the embedded part in the inner cavity of the shell body;

[0007] A first bevel is provided on the side edge of the covering portion of the cover plate that contacts the shell opening, and a second bevel is provided on the shell opening edge of the shell body. The first bevel of the cover plate and the second bevel of the shell body fit together, and the embedded portion of the cover plate and the first bevel of the cover plate constrain the shell body from inside and outside the shell body respectively, and the constraint is applicable to the welding process of the shell body and the cover plate.

[0008] Optionally, the covering portion includes a covering surface and a first end surface, the covering surface is a side of the covering portion of the cover plate in contact with the shell opening of the shell body, and the first end surface is a side opposite to the covering surface of the covering portion.

[0009] Optionally, the covering surface includes a covering plane and a first inclined surface, the covering plane matches with a plane of the shell opening of the shell body, and the first inclined surface matches with a second inclined surface of the shell opening of the shell body.

[0010] Optionally, the angle between the cross section of the first inclined surface in the first direction and the straight side of the cross section of the covering portion in the first direction away from the shell body cavity in the second direction is a first angle, and the angle between the cross section of the second inclined surface in the first direction and the straight side of the cross section of the shell body in the first direction away from the shell body cavity in the second direction is a second angle, and there is the following relationship between the first angle and the second angle:

[0011] α+β=180°, wherein α is the first angle and β is the second angle.

[0012] Optionally, the first inclined surface is located below the covering plane, and the angle between the first inclined surface and the covering plane is a third angle, and there is the following relationship between the third angle and the first angle:

[0013] γ=90°+α, where γ is the third angle.

[0014] Optionally, the first angle is an acute angle, and the second angle is an obtuse angle.

[0015] Optionally, the width and height of the cross section of the first inclined surface in the first direction have the following relationship:

[0016] b=a / tanα, wherein a is the width of the cross section of the first inclined surface in the first direction, and a is smaller than the wall thickness of the shell body; and b is the height of the cross section of the first inclined surface in the first direction.

[0017] Optionally, the first inclined surface is located above the overlapping plane, and the angle between the first inclined surface and the overlapping plane is a third angle, and the third angle and the first angle have the following relationship:

[0018] γ=90°+α.

[0019] Optionally, the first angle is an obtuse angle, and the second angle is an acute angle.

[0020] Optionally, the width and height of the cross section of the first inclined surface in the first direction have the following relationship:

[0021] b=a×tan(α-90°), wherein a is the width of the cross section of the first inclined surface in the first direction, and a is smaller than the wall thickness of the shell body; and b is the height of the cross section of the first inclined surface in the first direction.

[0022] According to a second aspect of the utility model, a battery cell is provided, comprising the above-mentioned shell and a pole core, wherein the pole core is accommodated in the shell.

[0023] According to a third aspect of the present invention, a battery system is provided, comprising at least one battery cell and a battery box as described above, wherein the at least one battery cell is accommodated in the battery box.

[0024] According to a fourth aspect of the present invention, there is provided an electrical device, comprising the above-mentioned battery system and the electrical device, wherein the battery system is used to supply power to the electrical device.

[0025] The utility model provides a shell body, by arranging a first inclined surface on the edge of the covering plane of the cover plate and arranging a second inclined surface on the outer edge of the shell opening of the shell body, the first inclined surface and the second inclined surface cooperate with each other and form a constraint together with the embedded part, thereby reducing the single-side gap of the shell cover, improving the consistency of the single-side gap of the shell cover, and effectively improving the yield rate of the shell cover welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 It is a schematic diagram of the pole core body of the utility model;

[0028] Figure 2 It is a schematic diagram of the pole core height of the utility model;

[0029] Description of reference numerals:

[0030] Second inclined surface 1, first inclined surface 2, covering plane 3, cover plate 4, first end surface 5, covering portion 6, covering surface 7, shell body 8, second end surface 9, embedded portion 10, first direction 11, second direction 12, first angle 13, second angle 14, third angle 15. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementation. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0033] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as those commonly understood by those skilled in the art in the technical field of this invention. The terms used in the specification of this invention are only for the purpose of describing specific embodiments and are not intended to limit this invention. The term "and / or" used in this invention includes any and all combinations of one or more of the related listed items.

[0034] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0035] In the prior art, the structural conditions of the battery cell shell body and the cover plate are as follows: the cover plate achieves the shell entry effect through the chamfering of the bottom, the shell body and the cover plate are clearance-fitted, the shell opening of the aluminum shell is easily scratched and deformed by the cover plate, the thickness of the aluminum shell is normally only 0.3mm~0.5mm, and the shell cover is mainly matched by the inner circle of the shell body and the end face of the shell opening to match the step of the cover plate for limiting, and aluminum has good ductility. The outer circle of the aluminum shell body is not limited, and the shell opening is prone to be higher than the side of the cover plate, which results in the shell cover having a single-side gap that is too large and cannot be fused or a weld hole during welding, resulting in a low yield of the shell cover welding process.

[0036] refer to Figure 1 to Figure 2 The utility model provides a shell for a battery cell, the shell comprises a shell body 8 and a cover plate 4, the cover plate 4 comprises a covering portion 6 and an embedding portion 10;

[0037] The embedded portion 10 is the portion of the cover plate 4 inserted into the inner cavity of the shell body 8 from the shell opening of the shell body 8, and the cover portion 6 is the portion of the cover plate 4 except the embedded portion 10 in the inner cavity of the shell body 8;

[0038] A first bevel 2 is provided on the side edge of the covering portion 6 of the cover plate 4 which contacts the shell opening, and a second bevel 1 is provided on the shell opening edge of the shell body 8. The first bevel 2 of the cover plate 4 and the second bevel 1 of the shell body 8 fit each other, and the embedded portion 10 of the cover plate 4 and the first bevel 2 of the cover plate 4 constrain the shell body 8 from inside and outside the shell body 8 respectively, and the constraint is applicable to the welding process of the shell body 8 and the cover plate 4.

[0039] Specifically, the shell body includes a shell body 8 and a cover plate 4, the structural designs of the shell body 8 and the cover plate 4 are optimized, and necessary constraints are imposed on the assembly positions of the cover plate 4 and the shell body 8. The cover plate 4 includes a covering portion 6 and an embedding portion 10, the covering portion 6 is used to cooperate with the shell opening of the shell body 8, and the embedding portion 10 is used to insert into the shell opening, the covering portion 6 and the embedding portion 10 of the cover plate 4 are integrally connected, the covering portion 6 is mainly used to cooperate with the shell opening to limit the gap between the cover plate 4 and the outside of the shell body 8, and the embedding portion 10 is mainly used to insert into the shell opening to limit the gap between the cover plate 4 and the inside of the shell body 8, and the embedding portion 10 is inserted into the shell opening. The relative position of the cover plate 4 and the shell body 8 is subject to certain constraints, and the cover plate 4 and the shell body 8 are clearance-matched, but only the matching constraint of the embedding portion 10 and the shell opening cannot meet the production yield requirement, so this scheme adds the covering portion 6 of the cover plate 4 The matching constraint of the side surface in contact with the shell opening and the shell opening of the shell body 8 is achieved by setting a first bevel 2 on the edge of the side surface in contact with the shell opening on the covering portion 6 of the cover plate 4, and setting a second bevel 1 on the outer edge of the shell opening. It should be noted that if the cover plate 4 and the shell body 8 are circular as a whole, the first bevel 2 and the second bevel 1 are both one-sided; if the cover plate 4 and the shell body 8 are square, the first bevel 2 and the second bevel 1 are set on four sides. For the above two situations, the first bevel 2 of the above two situations is uniformly referred to as the first bevel 2, and the second bevel 1 is referred to as the second bevel 1. Through the matching constraint of the first bevel 2 and the second bevel 1, combined with the insertion constraint of the embedded portion 10 and the shell opening, the matching constraint of the cover plate 4 and the shell body 8 is strengthened, and the consistency of the single-sided gap of the shell cover is improved, thereby improving the production yield of the welding process.

[0040] It should be noted that the first condition for the above-mentioned square aluminum shell battery is to select high-quality aluminum materials, which mainly includes the strength, toughness, conductivity and corrosion resistance of the material. For aluminum materials from different manufacturers or different models, material analysis should be carried out to confirm that their physical properties meet the process requirements. Then the cutting process is mainly to use CNC processing equipment to cut the aluminum plate into the shell of the square battery. In the cutting process, the accuracy requirements of the shell shape and size must be met, and the surface of the cut battery shell should not have defects such as deformation and cracks. Finally, the stamping process is to extrude the aluminum shell into four marked slots. The size and spacing of the slots must meet the requirements marked on the design drawing. When formulating the stamping process plan, the accuracy of the slots and the thickness of the plate must be taken into account to avoid problems such as jamming, rupture, and cracking. After the shell is made, the second bevel 1 is CNC-processed on the edge of the main shell mouth to match the first bevel 2.

[0041] It should be noted that the above-mentioned battery cover plate 4 is one of the main components of the lithium battery cell, which is usually made of metal, plastic and other materials. It serves as a battery cover and sealing device, and plays the role of encapsulating, isolating and protecting the battery cell. In order to ensure the safety and performance of the battery, the battery cover plate 4 needs to meet the requirements of good sealing performance, which can effectively prevent the leakage of electrolyte inside the battery cell. It also needs to meet the requirements of high temperature resistance, corrosion resistance, wear resistance, long-term stable performance, and reasonable hole layout and high precision, which can ensure the airtightness and circuit connectivity inside the battery cell. The manufacturing process and quality of the battery cover plate 4 have a very important impact on the performance and life of the battery. There are many kinds of materials for the battery cover plate 4, and common ones are metal materials such as stainless steel, aluminum alloy, titanium alloy, copper, and plastic materials such as PP and PE. Different materials have different characteristics and uses. When selecting materials, it is necessary to comprehensively consider the performance requirements of the battery cell and the production cost. The production of the battery cover plate 4 usually adopts a stamping process, and the material is pressed into the desired shape by a mold on a punch press. This process needs to fully consider the hardness, elasticity and brittleness of the material, as well as the precision and life of the mold. After stamping, the battery cover plate 4 needs to be surface treated to achieve a certain aesthetic and anti-corrosion effect. Common treatment methods include oxidation, electroplating, painting, etc. Finally, the battery cover plate 4 is assembled with other battery components, such as adding battery cores, liquid electrolytes, etc., and quality inspection is carried out to ensure that the quality of the product meets the requirements. In addition, a first bevel 2 is designed on the edge of the side where the covering portion 6 of the cover plate 4 contacts the shell opening, which is used to cooperate with the second bevel 1. It should be noted that the embedded portion 10 of the cover plate 4 also includes a second end face 9, and a chamfer is provided on the edge of the second end face 9, and the chamfer facilitates the insertion of the embedded portion 10 into the shell opening to form an internal constraint of the shell body 8.

[0042] In one embodiment, the covering portion 6 includes a covering surface 7 and a first end surface 5. The covering surface 7 is the side of the covering portion 6 of the cover plate 4 that contacts the shell opening of the shell body 8, and the first end surface 5 is the side opposite to the covering surface 7 of the covering portion 6.

[0043] Specifically, the cover plate 4 includes a covering portion 6 and an embedding portion 10. The cross section of the cover plate 4 along the first direction 11 is a T-shaped structure. The covering portion 6 is the portion between the covering surface 7 and the first end surface 5, and the embedding portion 10 is the portion between the covering surface 7 and the second end. The covering portion 6 covers the shell opening of the shell body 8, and the embedding portion 10 is inserted into the shell opening of the shell body 8. The covering portion 6 and the embedding portion 10 of the above-mentioned cover plate 4 are connected as one piece. The covering portion 6 mainly cooperates with the shell opening to define the gap between the cover plate 4 and the outside of the shell body 8, and the embedding portion 10 is mainly used to insert into the shell opening to define the gap between the cover plate 4 and the inside of the shell body 8. Through the dual constraints of the embedding portion 10 and the covering portion 6 on the shell cover, the single-side gap deviation of the shell cover is reduced, the consistency of the shell cover gap is improved, and the yield rate of the welding process is improved.

[0044] In one embodiment, the covering surface 7 includes a covering plane 3 and a first inclined surface 2 , the covering plane 3 matches with the plane of the shell opening of the shell body 8 , and the first inclined surface 2 matches with the second inclined surface 1 of the shell opening of the shell body 8 .

[0045] Specifically, the above-mentioned covering plane 3 is used to cooperate with the shell opening, wherein the covering plane 3 cooperates with the plane part of the shell opening, the first inclined surface 2 cooperates with the second inclined surface 1 of the shell opening, and the above-mentioned covering surface 7 is used to form a constraint with the shell opening at the periphery of the shell body 8, and the constraint formed by the cooperating embedded part 10 and the inside of the shell body 8, which reduces the single-side gap of the shell cover as a whole, improves the consistency of the matching gap of the shell cover, and improves the yield of the welding process.

[0046] In one embodiment, the angle between the cross section of the first inclined surface 2 in the first direction 11 and the straight side of the cross section of the covering portion 6 in the first direction 11 away from the cavity of the shell body 8 in the second direction 12 is a first angle 13, and the angle between the cross section of the second inclined surface 1 in the first direction 11 and the straight side of the cross section of the shell body 8 in the first direction 11 away from the cavity of the shell body 8 in the second direction 12 is a second angle 14, and there is the following relationship between the first angle 13 and the second angle 14:

[0047] α+β=180°, wherein α is the first angle 13 , and β is the second angle 14 .

[0048] Specifically, the sum of the first angle 13 and the second angle 14 is 180°. This limitation can ensure that the first bevel 2 and the second bevel 1 can be effectively fitted together. For example, when α is 60°, according to the relationship, β=180°-α=180°-60°=120° can be obtained. At this time, it can be ensured that the first bevel 2 of the cover plate 4 and the second bevel 1 of the shell opening of the shell body 8 are effectively fitted together, effectively forming the peripheral constraint of the shell body 8.

[0049] In one embodiment, the first inclined surface 2 is located below the covering plane 3, and the angle between the first inclined surface 2 and the covering plane 3 is a third angle 15. The third angle 15 and the first angle 13 have the following relationship:

[0050] γ=90°+α, where γ is the third included angle 15.

[0051] Specifically, when the first inclined surface 2 is below the covering plane 3, the cross section of the first inclined surface 2 and the cross section of the covering plane 3 are extended to the edge of the cross section of the covering portion 6 in the first direction 11, and they form a right triangle, and the third angle 15 can be regarded as an external angle of the triangle, so that γ = 90° + α. For example, when α is 60°, γ = 90° + α = 90° + 60° = 150°.

[0052] In one embodiment, the first angle 13 is an acute angle, and the second angle 14 is an obtuse angle.

[0053] Specifically, when the first inclined surface 2 is located below the covering plane 3, the first angle 13 is an acute angle, and when the first angle 13 is an acute angle, the second angle 14 is an obtuse angle, because the sum of the first angle 13 and the second angle 14 is 180°.

[0054] In one embodiment, the width and height of the cross section of the first inclined surface 2 in the first direction 11 have the following relationship:

[0055] b=a / tanα, wherein a is the width of the cross section of the first inclined surface 2 in the first direction 11 , and a is smaller than the wall thickness of the shell body 8 ; and b is the height of the cross section of the first inclined surface 2 in the first direction 11 .

[0056] Specifically, when the first inclined surface 2 is located below the covering plane 3, the cross-section of the first inclined surface 2 and the cross-section of the covering plane 3 are extended to the edge of the covering portion 6 in the first direction 11, and they form a right triangle. At this time, according to the characteristics of the triangle, b=a / tanα can be obtained. For example, when a=0.1mm and α=60°, b=0.1 / tan60°≈0.06mm can be obtained. It should be noted that the wall thickness of the shell body 8 is generally 0.3~0.5mm.

[0057] In one embodiment, the first inclined surface 2 is located above the covering plane 3, and the angle between the first inclined surface 2 and the covering plane 3 is a third angle 15. The third angle 15 and the first angle 13 have the following relationship:

[0058] γ=90°+α.

[0059] Specifically, when the first inclined surface 2 is above the covering plane 3, the cross-section of the first inclined surface 2 in the first direction 11, the extension line of the straight edge of the cross-section of the covering portion 6 in the first direction 11, and the cross-section of the covering plane 3 extended to the extension line of the straight edge of the cross-section of the covering portion 6 in the first direction 11, the above three sides form a right triangle, the sum of the third angle 15 and an external angle of the right triangle is 360°, and this external angle is equal to 90°+180°-α, then the third angle 15γ is equal to 360-(90°+180°-α), and it is further concluded that γ=90°+α. It should be noted that in the above case, the constraint relationship of the shell cover has changed, but the final effect is the same as the effect when the first bevel 2 is below the covering plane 3. In the present embodiment, the shell body 8 is constrained by the second bevel 1 of the inner cavity and the shell opening corresponding to the embedded portion 10 of the cover plate 4 and the first bevel 2 of the covering portion 6, which ultimately reduces the single-sided gap of the cover and shell matching, improves the consistency of the single-sided gap of the shell cover, and improves the yield of the shell cover welding process.

[0060] In one embodiment, the first angle 13 is an obtuse angle, and the second angle 14 is an acute angle.

[0061] Specifically, when the first inclined surface 2 is located above the covering plane 3, the first angle 13 is an obtuse angle, and when the first angle 13 is an obtuse angle, the second angle 14 is an acute angle, because the sum of the first angle 13 and the second angle 14 is 180°. In the present embodiment, the second inclined surface 1 of the shell body 8 through the inner cavity and the shell opening corresponds to the embedded portion 10 of the cover plate 4 and the first inclined surface 2 of the covering portion 6, which ultimately reduces the single-side gap of the cover and shell, improves the consistency of the single-side gap of the shell cover, and improves the yield of the shell cover welding process.

[0062] In one embodiment, the width and height of the cross section of the first inclined surface 2 in the first direction 11 have the following relationship:

[0063] b=a×tan(α-90°), wherein a is the width of the cross section of the first inclined surface 2 in the first direction 11 , and a is smaller than the wall thickness of the shell body 8 ; and b is the height of the cross section of the first inclined surface 2 in the first direction 11 .

[0064] Specifically, when the first inclined surface 2 is above the covering plane 3, the cross section of the first inclined surface 2 in the first direction 11, the extension line of the edge straight side of the cross section of the covering portion 6 in the first direction 11, and the cross section of the covering plane 3 extending to the extension line of the edge straight side of the cross section of the covering portion 6 in the first direction 11, the above three sides form a right triangle, at this time, according to the characteristics of the triangle, b = a × tan (α-90°), for example, when a = 0.1mm, α = 120°, then b = 0.1 × tan30° ≈ 0.06mm, it should be noted that the wall thickness of the shell body 8 is generally 0.3 to 0.5mm. In the case of this embodiment, the size of the above inclined surface is controlled, and the second inclined surface 1 of the shell body 8 through the inner cavity and the shell opening corresponds to the embedded part 10 of the cover plate 4 and the first inclined surface 2 of the covering portion 6 to constrain, and finally reduce the single-side gap of the cover and shell, improve the consistency and matching accuracy of the single-side gap of the shell cover, and improve the yield of the shell cover welding process.

[0065] According to another embodiment of the present application, a battery cell is provided, comprising the above-mentioned shell and a pole core, wherein the pole core is accommodated in the shell.

[0066] Specifically, the above-mentioned battery cell uses the above-mentioned shell. By using the above-mentioned shell, the shell cover is constrained by the cooperation of the first inclined surface 2 and the second inclined surface 1. At the same time, combined with the constraint cooperation of the embedded part 10 of the cover plate 4 and the shell body 8, the inside and outside of the shell cover are constrained, which effectively reduces the unilateral cooperation gap between the shell covers, improves the consistency of the unilateral gap of the shell cover, and improves the yield of the shell cover welding process.

[0067] According to another embodiment of the present application, a battery system is provided, including at least one battery cell and a battery case as described above, wherein the at least one battery cell is accommodated in the battery case.

[0068] Specifically, the battery system uses the battery cell, and the battery cell uses the shell. By using the shell, the shell cover is constrained by the first inclined surface 2 and the second inclined surface 1, and the cover plate 4 embedding portion 10 is constrained by the shell body 8. The shell cover is constrained inside and outside, which effectively reduces the single-sided gap between the shell covers, improves the consistency of the single-sided gap of the shell cover, and improves the yield of the shell cover welding process. It should be noted that the at least one battery cell is accommodated in the battery case.

[0069] According to another embodiment of the present application, there is provided an electrical device, comprising the above-mentioned battery system and the electrical device, wherein the battery system is used to supply power to the electrical device.

[0070] Specifically, the electrical equipment can be a new energy vehicle, an outdoor energy storage device, or a refrigeration device. For example, the electrical equipment is a fan with a battery system. In this case, the electrical appliance is a fan motor. The battery system supplies power to the fan motor, and the fan motor drives the fan to rotate.

[0071] The utility model provides a shell body, by arranging a first bevel 2 on the edge of a covering plane 3 of a cover plate 4 and arranging a second bevel 1 on the outer edge of a shell opening of a shell body 8, the first bevel 2 and the second bevel 1 cooperate with each other and form a constraint together with an embedded portion 10, thereby reducing the single-sided gap of the shell cover, improving the consistency of the single-sided gap of the shell cover, and effectively improving the yield rate of the shell cover welding process.

[0072] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0073] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A shell for a battery cell, characterized in that: The housing comprises a housing body and a cover plate, wherein the cover plate comprises a covering portion and an embedding portion; The embedding portion is the portion of the cover plate inserted into the inner cavity of the shell body from the shell opening of the shell body, and the covering portion is the portion of the cover plate excluding the embedding portion in the inner cavity of the shell body; A first bevel is provided on the side edge of the covering portion of the cover plate that contacts the shell opening, and a second bevel is provided on the shell opening edge of the shell body. The first bevel of the cover plate and the second bevel of the shell body fit together, and the embedded portion of the cover plate and the first bevel of the cover plate constrain the shell body from inside and outside the shell body respectively, and the constraint is applicable to the welding process of the shell body and the cover plate.

2. The housing according to claim 1, characterized in that The covering portion includes a covering surface and a first end surface. The covering surface is a side of the covering portion of the cover plate in contact with the shell opening of the shell body, and the first end surface is a side opposite to the covering surface of the covering portion.

3. The housing according to claim 2, characterized in that: The covering surface includes a covering plane and the first inclined surface, the covering plane matches with the plane of the shell opening of the shell body, and the first inclined surface matches with the second inclined surface of the shell opening of the shell body.

4. The housing according to claim 3, characterized in that: The angle between the cross section of the first inclined surface in the first direction and the straight side of the cross section of the covering portion in the first direction away from the shell body cavity in the second direction is a first angle, and the angle between the cross section of the second inclined surface in the first direction and the straight side of the cross section of the shell body in the first direction away from the shell body cavity in the second direction is a second angle, and the first angle and the second angle have the following relationship: α+β=180°, wherein α is the first angle, and β is the second angle.

5. The housing according to claim 4, characterized in that: The first inclined surface is located below the covering plane, and the angle between the first inclined surface and the covering plane is a third angle. The third angle and the first angle have the following relationship: γ=90°+α, wherein γ is the third angle.

6. The housing according to claim 4 or 5, characterized in that: The first angle is an acute angle, and the second angle is an obtuse angle.

7. The housing according to claim 4 or 5, characterized in that: The width and height of the cross section of the first inclined surface in the first direction have the following relationship: b=a / tanα, wherein a is the width of the cross section of the first inclined surface in the first direction, and a is smaller than the wall thickness of the shell body; and b is the height of the cross section of the first inclined surface in the first direction.

8. The housing according to claim 5, characterized in that The first inclined surface is located on the covering plane, and the third angle and the first angle have the following relationship: γ=90°+α.

9. The housing according to claim 8, characterized in that The first angle is an obtuse angle, and the second angle is an acute angle.

10. The housing according to claim 4 or 8, characterized in that: The width and height of the cross section of the first inclined surface in the first direction have the following relationship: b=a×tan(α-90°), wherein a is the width of the cross section of the first inclined surface in the first direction, and a is smaller than the wall thickness of the shell body; and b is the height of the cross section of the first inclined surface in the first direction.

11. A battery cell, characterized in that: It comprises the shell and pole core as described in any one of claims 1 to 10, wherein the pole core is accommodated in the shell.

12. A battery system, characterized in that: The invention comprises at least one battery cell as claimed in claim 11 and a battery case, wherein at least one of the battery cells is accommodated in the battery case.

13. An electrical equipment, characterized in that: It comprises the battery system as claimed in claim 12 and an electrical appliance, wherein the battery system is used to supply power to the electrical appliance.

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