Battery case and battery having the same

Abstract

The utility model provides a kind of battery case and the battery with it.The battery case of utility model embodiment includes including upper cover, lower shell and welding part, upper cover is covered on lower shell;Upper cover and lower shell are connected by welding part, the plane where the contact surface of upper cover and lower shell is perpendicular with the extension direction of welding part;The difference of the length L1 of the upper cover and the length L2 of the lower shell is L1-L2=0.05~0.15mm;The difference of the width W1 of the upper cover and the width W2 of the lower shell is W1-W2=0.05~0.15mm.Therefore, the battery case of utility model can be convenient for welding upper cover and lower shell, reduce the probability of appearing false welding, also reduce the influence to the overall appearance of battery case.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery casing and a battery having the same. Background Technology

[0002] With the increasing development of electronic products, they are becoming smaller and smaller. This places higher demands on the size and capacity of batteries. How to reduce battery size and increase battery capacity is a technical problem that urgently needs to be solved.

[0003] In related technologies, battery casings typically include a lower casing and an upper cover. The upper cover is placed on the lower casing to form the battery casing. In related technologies, the outer edges of the upper cover and the lower casing are usually flush. During the welding of the casing, the edges of the upper cover and the lower casing are prone to heat deformation, causing the edge of the lower casing to protrude from the edge of the upper cover. On the one hand, the upper cover and the lower casing are prone to misalignment, resulting in poor welding. On the other hand, it affects the overall aesthetics of the battery casing. Utility Model Content

[0004] This utility model provides a battery casing to solve the problem of how to reduce battery size and increase battery capacity in related technologies, thereby achieving the effect of reducing battery size and increasing battery capacity.

[0005] The battery casing of this utility model embodiment includes an upper cover, a lower shell, and a welding part. The upper cover is fitted onto the lower shell. The upper cover and the lower shell are connected by the welding part, and the plane where the contact surface of the upper cover and the lower shell is located is perpendicular to the extension direction of the welding part.

[0006] The difference between the length L1 of the upper cover and the length L2 of the lower shell is L1-L2=0.05~1mm.

[0007] The difference between the width W1 of the upper cover and the width W2 of the lower shell is W1-W2=0.05~1mm.

[0008] It is understandable that by setting the difference between the length L1 of the upper cover 102 and the length L2 of the lower shell 103 to L1-L2=0.05~0.15mm, and the difference between the width W1 of the upper cover 102 and the width W2 of the lower shell 103 to W1-W2=0.05~0.15mm, the edge of the upper cover protrudes outward from the edge of the lower shell. During the welding process, this can cover the thermal deformation caused by the heat on the edge of the lower shell, preventing the thermal deformation caused by the heat on the edge of the lower shell from easily protruding from the edge of the upper cover. This facilitates the welding of the upper cover and the lower shell, and also reduces the impact on the overall aesthetics of the battery casing.

[0009] Therefore, the battery casing of this utility model can facilitate the welding of the upper cover and the lower shell, reduce the probability of poor welding, and also reduce the impact on the overall aesthetics of the battery casing.

[0010] Optionally, the upper cover has a flat plate structure;

[0011] The lower shell includes a bottom wall and a side wall. The side wall is disposed along the outer edge of the bottom wall and extends in a vertical direction. The upper cover is connected to the side wall through the welded part.

[0012] Optionally, the thickness of the upper cover is 0.05~0.2mm, and / or the wall thickness of the lower shell is 0.15~0.3mm.

[0013] Optionally, the height of the welded portion within the lower shell is 0.1~0.3mm.

[0014] Optionally, the welded portion includes a first edge and a second edge, the projections of the first edge and the second edge in the direction of the lower shell both being located within the contact surface.

[0015] Optionally, the distance between the projection of the first edge in the direction of the lower shell and the outer wall of the lower shell is 0~0.1mm;

[0016] The distance between the projection of the second edge in the direction of the lower shell and the inner wall of the lower shell is 0~0.1mm.

[0017] This utility model also provides a battery.

[0018] The battery of this utility model embodiment includes

[0019] Battery casing as described in the above embodiments;

[0020] The electrode assembly, disposed on the lower housing, comprises:

[0021] The pole post includes a first post, a second post, and a third post. The first post is located outside the lower shell, the second post is located inside the lower shell, and the third post passes through the lower shell and connects the first post and the second post.

[0022] An insulating and sealing structure is provided between the third column and the lower shell, between the first column and the lower shell, and between the second column, wherein the insulating and sealing structure is interference-fitted with the third column;

[0023] A pressure ring is provided between the first column and the insulating sealing structure, or the pressure ring is provided between the second column and the insulating sealing structure.

[0024] The battery of this embodiment of the invention uses an interference fit between the insulating and sealing structure and the third post. On the one hand, this allows the third post and the insulating and sealing structure to fit tightly, reducing the volume of the terminal assembly and thus reducing the space occupied by the terminal assembly inside the cell. On the other hand, after the third post is installed in the insulating and sealing structure, it can be automatically positioned under the action of the insulating and sealing structure, reducing the occurrence of installation errors and improving the assembly efficiency of the terminal assembly, thereby improving the assembly efficiency of the battery casing of this embodiment of the invention.

[0025] Therefore, the battery of the present invention can increase the capacity of the casing without increasing the casing size, so as to accommodate larger-sized cells, thereby increasing the energy density of the battery.

[0026] Optionally, the insulating sealing structure includes an insulating gasket and a sealing gasket.

[0027] The sealing gasket is located between the housing and the second column; one end face of the insulating gasket abuts against the sealing gasket, and the other end face of the insulating gasket abuts against the pressure ring; or,

[0028] The sealing gasket is located between the housing and the pressure ring, one end face of the insulating gasket abuts against the sealing gasket, and the other end face of the insulating gasket abuts against the first column.

[0029] Optionally, the diameter of the first column is smaller than the diameter of the second column, and the diameter of the first column is larger than the diameter of the third column; or

[0030] The diameter of the first column is smaller than the diameter of the second column, and the diameter of the first column is larger than the diameter of the third column. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of the present invention;

[0033] Figure 2 This is a cross-sectional view of a battery according to an embodiment of the present invention;

[0034] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0035] Figure 4 This is a schematic diagram of the structure of a battery according to another embodiment of the present invention;

[0036] Figure 5 This is a cross-sectional view of a battery according to another embodiment of the present invention;

[0037] Figure 6 yes Figure 5 A magnified view of part B in the middle.

[0038] Figure 7 This is a schematic diagram of the battery casing structure according to an embodiment of the present invention;

[0039] Figure 8 yes Figure 7 A magnified view of part C in the middle.

[0040] In the picture:

[0041] 100. Battery casing;

[0042] 1. Shell; 101. Receiving cavity; 102. Top cover; 103. Lower shell; 1031. Bottom wall; 1032. Side wall;

[0043] 2. Through hole;

[0044] 3. Pressure ring;

[0045] 4. Pole post; 401. First column; 402. Second column; 403. Third column;

[0046] 5. Insulated and sealed structure;

[0047] 501, Insulating gasket; 5011, First insulating sheet; 5012, Second insulating sheet; 50121, First receiving groove;

[0048] 502, sealing gasket; 5021, second receiving groove;

[0049] 6. Isolation component; 601. Isolation part; 602. Connecting part;

[0050] 7. Welded section; 701. First edge; 702. Second edge. Detailed Implementation

[0051] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0052] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal encapsulation of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0054] In order to solve the problem of how to reduce battery size and increase battery capacity in related technologies, so as to achieve the effect of reducing battery size and increasing battery capacity.

[0055] This utility model provides a battery casing 100.

[0056] The battery casing 100 of this utility model embodiment includes an upper cover 102, a lower casing 103 and a welding part 7. The upper cover 102 covers the lower casing 103. The upper cover 102 and the lower casing 103 are connected by the welding part 7. The plane where the contact surface of the upper cover 102 and the lower casing 103 is located is perpendicular to the extension direction of the welding part 7.

[0057] The difference between the length L1 of the upper cover 102 and the length L2 of the lower shell 103 is L1-L2=0.05~0.15mm;

[0058] The difference between the width W1 of the upper cover 102 and the width W2 of the lower shell 103 is W1-W2=0.05~0.15mm.

[0059] It is understandable that by setting the difference between the length L1 of the upper cover 102 and the length L2 of the lower shell 103 to L1-L2=0.05~0.15mm, and the difference between the width W1 of the upper cover 102 and the width W2 of the lower shell 103 to W1-W2=0.05~0.15mm, the edge of the upper cover 102 protrudes outward from the edge of the lower shell 103. During the welding process, this can cover the thermal deformation caused by the heat on the edge of the lower shell 103, preventing the thermal deformation caused by the heat on the edge of the lower shell 103 from easily protruding from the edge of the upper cover 102. This facilitates the welding of the upper cover 102 and the lower shell 103, reduces the probability of incomplete welding, and also reduces the impact on the overall aesthetics of the battery casing.

[0060] Therefore, the battery casing 100 of this utility model can facilitate the welding of the upper cover 102 and the lower casing 103, reduce the probability of poor welding, and also reduce the impact on the overall aesthetics of the battery casing.

[0061] The following is in conjunction with the appendix Figure 1-8 The present invention describes the battery casing 100.

[0062] like Figure 7 and 8 As shown, the battery casing 100 of this utility model embodiment includes an upper cover 102, a lower casing 103 and a welding part 7. The upper cover 102 covers the lower casing 103. The upper cover 102 and the lower casing 103 are connected by the welding part 7. The plane where the contact surface of the upper cover 102 and the lower casing 103 is located is perpendicular to the extension direction of the welding part 7.

[0063] It is understandable that the welding part 7 is formed by the solidification of the molten metal pool formed during the welding of the upper cover 102 and the lower shell 103. The welding part 7 extends through the upper cover 102 to the lower shell 103, thereby enabling the welding part 7 to connect the upper cover 102 and the lower shell 103.

[0064] The difference between the length L1 of the upper cover 102 and the length L2 of the lower shell 103 is L1-L2=0.05~0.15mm;

[0065] The difference between the width W1 of the upper cover 102 and the width W2 of the lower shell 103 is W1-W2=0.05~0.15mm.

[0066] It is understandable that by setting the difference between the length L1 of the upper cover 102 and the length L2 of the lower shell 103 to L1-L2=0.05~0.15mm, and the difference between the width W1 of the upper cover 102 and the width W2 of the lower shell 103 to W1-W2=0.05~0.15mm, the edge of the upper cover 102 protrudes outward from the edge of the lower shell 103. During the welding process, this can cover the thermal deformation caused by the heat on the edge of the lower shell 103, preventing the thermal deformation caused by the heat on the edge of the lower shell 103 from easily protruding from the edge of the upper cover 102. This facilitates the welding of the upper cover 102 and the lower shell 103, reduces the probability of incomplete welding, and also reduces the impact on the overall aesthetics of the battery casing.

[0067] The thickness of the upper cover 102 is 0.05~0.2mm, and / or the wall thickness of the lower shell 103 is 0.15~0.3mm. That is to say, the thickness of the upper cover 102 is 0.05~0.2mm, or the wall thickness of the lower shell 103 is 0.15~0.3mm, or the thickness of the upper cover 102 is 0.05~0.2mm and the wall thickness of the lower shell 103 is 0.15~0.3mm.

[0068] Preferably, the thickness of the top cover 102 is 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, or 0.20mm.

[0069] Preferably, the wall thickness of the lower shell 103 is 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.20mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, or 0.30mm.

[0070] The upper cover 102 and lower cover 103 of the battery casing 100 are usually formed by stamping metal sheets. In other words, the thickness of the upper cover 102 and the wall thickness of the lower cover 103 can be understood as the thickness of the metal sheets used to manufacture the upper cover 102 and the lower cover 103.

[0071] It is understandable that the battery casing 100 is used to house the battery cells. If the battery casing 100 can house battery cells of the same size, and if the wall thickness of the battery casing 100 is reduced, the volume of the battery casing 100 can be reduced while still meeting the requirements for housing the battery cells, thereby reducing the volume of the battery.

[0072] Therefore, by setting the thickness of the upper cover 102 within the above-mentioned range, the battery casing 100 of this utility model embodiment can reduce the impact of the casing 1 wall thickness on the battery volume while meeting the structural strength requirements of the battery, and further reduce the battery volume.

[0073] In some embodiments, such as Figure 7 As shown,

[0074] The top cover 102 is a flat plate structure;

[0075] The lower shell 103 includes a bottom wall 1031 and a side wall 1032. The side wall 1032 is provided along the outer edge of the bottom wall 1031 and extends in the vertical direction. The upper cover 102 is connected to the side wall 1032 through a welding part 7.

[0076] As mentioned above, the welding part 7 is formed by the solidification of the molten metal pool formed during the welding of the upper cover 102 and the lower shell 103. That is, the welding part 7 extends through the upper cover 102 to the side wall 1032 of the lower shell 103, thereby enabling the welding part 7 to connect the upper cover 102 and the lower shell 103.

[0077] In some embodiments, the height of the portion of the welded part 7 located inside the lower shell 103 is 0.1~0.3mm to ensure that the periphery of the upper cover 102 is welded and sealed securely with the opening of the side wall of the lower shell 103.

[0078] As previously described, the welded portion 7 extends through the upper cover 102 to the side wall 1032 of the lower shell 103, that is, the welded portion 7 includes a portion located on the side wall 1032 of the lower shell 103.

[0079] Furthermore, the welding part 7 includes a first edge 701 and a second edge 702, the projections of the first edge 701 and the second edge 702 in the direction of the lower shell 103 are both located within the contact surface.

[0080] Furthermore, the distance between the projection of the first edge 701 in the direction of the lower shell 103 and the outer wall of the lower shell 103 is 0~0.1mm, ensuring that the periphery of the upper cover and the opening of the side wall of the lower shell are welded and sealed firmly.

[0081] The distance between the projection of the second edge 702 in the direction of the lower shell 103 and the inner wall of the lower shell 103 is 0~0.1mm, ensuring that the periphery of the upper cover and the opening of the side wall of the lower shell are welded and sealed firmly.

[0082] This invention provides a battery.

[0083] The battery of this utility model embodiment includes a battery casing 100 as described in the above embodiment and an electrode post 4 assembly disposed on the battery casing 100.

[0084] Optionally, the pole post 4 assembly can be disposed on the lower shell 103, or the pole post 4 assembly can be disposed on the upper cover 102.

[0085] like Figure 1 and 4 As shown, the electrode post 4 assembly of this utility model is disposed on the lower shell 103 of the battery housing 100, and the electrode post 4 assembly includes electrode post 4, insulating sealing structure 5 and pressure ring 3.

[0086] The pole post 4 includes a first post 401, a second post 402 and a third post 403. The first post 401 is located outside the lower shell 103, the second post 402 is located inside the lower shell 103, and the third post 403 passes through the lower shell 103 and connects the first post 401 and the second post 402.

[0087] The insulating sealing structure 5 is disposed between the third column 403 and the lower shell 103, between the first column 401 and the lower shell 103, and between the second column 402. The insulating sealing structure 5 is interference-fitted with the third column 403.

[0088] The pressure ring 3 is located between the first column 401 and the insulating sealing structure 5, or the pressure ring 3 is located between the second column 402 and the insulating sealing structure 5.

[0089] It is understood that the pressure ring 3 in this embodiment of the present invention has two configuration methods.

[0090] Firstly, the pressure ring 3 is located between the first column 401 and the insulating sealing structure 5. That is, the pressure ring 3 is located outside the lower shell 103. As shown in the figure, one end face of the pressure ring 3 in the thickness direction abuts against the insulating sealing structure 5, and the other end face of the pressure ring 3 in the thickness direction abuts against the first column 401.

[0091] Secondly, the pressure ring 3 is located between the second column 402 and the insulating structure. That is, the pressure ring 3 is located inside the lower shell 103. As shown in the figure, one end face of the pressure ring 3 in the thickness direction abuts against the insulating sealing structure 5, and the other end face of the pressure ring 3 in the thickness direction abuts against the second column 402.

[0092] In some embodiments, the insulating sealing structure 5 includes an insulating gasket 501 and a sealing gasket 502.

[0093] By configuring the insulating sealing structure 5 to include an insulating gasket 501 and a sealing gasket 502, that is, by configuring the insulating sealing structure 5 as a separate structure with two separate parts, it is easier to assemble the insulating sealing structure 5 and reduce the assembly difficulty of the insulating sealing structure 5.

[0094] The sealing gasket 502 is located between the housing 1 and the second column 402. One end face of the insulating gasket 501 in its thickness direction abuts against the sealing gasket 502, and the other end face of the insulating gasket 501 in its thickness direction abuts against the pressure ring 3; or...

[0095] The sealing gasket 502 is located between the housing 1 and the pressure ring 3. One end face of the insulating gasket 501 in the thickness direction abuts against the sealing gasket 502, and the other end face of the insulating gasket 501 in the thickness direction abuts against the first column 401.

[0096] As mentioned above, the pressure ring 3 of this utility model embodiment has two configuration methods. Correspondingly, the positional relationship between the insulating gasket 501 and the sealing gasket 502 and the pressure ring 3 of this utility model embodiment also has two configuration methods.

[0097] Firstly, such as Figure 3 As shown, the sealing gasket 502 is located between the housing 1 and the second column 402, and the insulating gasket 501 abuts against the sealing gasket 502 at one end face in the thickness direction, and the insulating gasket 501 abuts against the pressure ring 3 at the other end face in the thickness direction.

[0098] Secondly, such as Figure 6 As shown, the sealing gasket 502 is located between the housing 1 and the pressure ring 3, and one end face of the insulating gasket 501 in the thickness direction abuts against the sealing gasket 502, while the other end face of the insulating gasket 501 in the thickness direction abuts against the first column 401.

[0099] In some embodiments, when the pressure ring 3 is disposed between the first column 401 and the insulating sealing structure 5, the diameter of the first column 401 is smaller than the diameter of the second column 402, and the diameter of the first column 401 is larger than the diameter of the third column 403.

[0100] In some embodiments, the pressure ring 3 is disposed between the second column 402 and the insulating structure, the diameter of the first column 401 is smaller than the diameter of the second column 402, and the diameter of the first column 401 is larger than the diameter of the third column 403.

[0101] In some embodiments, the insulating pad 501 includes a first insulating sheet 5011 and a second insulating sheet 5012 connected together. The first insulating sheet 5011 is disposed between the outer periphery of the third column 403 and the housing 1. The second insulating sheet 5012 is disposed on the side of the housing 1 away from the receiving cavity 101 and abuts against the housing 1.

[0102] like Figure 3 and 6As shown, the first insulating sheet 5011 and the second insulating sheet 5012 are integrally formed. That is, the first insulating sheet 5011 is located inside the through hole 2 of the housing 1 to isolate the outer periphery of the third column 403 from the housing 1, and the second insulating sheet 5012 is located on the side of the housing 1 away from the receiving cavity 101 and abuts against the housing 1.

[0103] In some embodiments, such as Figure 6 As shown, the second insulating sheet 5012 has a first receiving groove 50121 on the side away from the receiving cavity 101. The first receiving groove 50121 is used to receive at least part of the first column 401; that is, the first receiving groove 50121 can receive part of the first column 401 or all of the first column 401. In other words, the depth of the first receiving groove 50121 is less than or equal to the thickness of the first column 401.

[0104] The wall of the first receiving groove 50121 is interference-fitted with the first column 401;

[0105] By interfering with the groove wall of the first receiving groove 50121 and the second column 402, the inner peripheral wall of the first receiving groove 50121 abuts against the outer peripheral wall of the first column 401, so that the first receiving groove 50121 can limit the first column 401 and prevent the first column 401 from being misaligned in the first receiving groove 50121.

[0106] Correspondingly, the sealing gasket 502 is provided with a second receiving groove 5021 on the side facing the receiving cavity 101. The second receiving groove 5021 is used to receive at least part of the pressure ring 3. That is, the second receiving groove 5021 can receive part of the pressure ring 3 or all of the pressure ring 3. The depth of the first receiving groove 50121 is less than or equal to the thickness of the pressure ring 3.

[0107] The wall of the second receiving groove 5021 is interference-fitted with the pressure ring 3;

[0108] By interfering with the groove wall of the second receiving groove 5021 and the pressure ring 3, the inner peripheral wall of the second receiving groove 5021 abuts against the outer peripheral wall of the pressure ring 3, so that the second receiving groove 5021 can limit the pressure ring 3 and prevent the pressure ring 3 from being misaligned in the first receiving groove 50121.

[0109] In some embodiments, such as Figure 4 As shown, the first receiving groove 50121 is used to receive at least a portion of the pressure ring 3. That is, the first receiving groove 50121 can receive a portion of the pressure ring 3 or all of the pressure ring 3. In other words, the depth of the first receiving groove 50121 is less than or equal to the pressure ring 3.

[0110] The wall of the first receiving groove 50121 is interference-fitted with the pressure ring 3.

[0111] By interfering with the groove wall of the first receiving groove 50121 and the pressure ring 3, the inner peripheral wall of the first receiving groove 50121 abuts against the outer peripheral wall of the pressure ring 3, so that the first receiving groove 50121 can limit the pressure ring 3 and prevent the pressure ring 3 from being misaligned in the first receiving groove 50121.

[0112] Correspondingly, the second receiving groove 5021 is used to receive at least a portion of the second column 402, that is, the second receiving groove 5021 can receive a portion of the second column 402 or all of the second column 402, and the depth of the first receiving groove 50121 is less than or equal to the thickness of the second column 402.

[0113] The wall of the second receiving groove 5021 is interference-fitted with the second column 402.

[0114] By interfering with the second column 402 through the wall of the second receiving groove 5021, the inner peripheral wall of the second receiving groove 5021 abuts against the outer peripheral wall of the second column 402, so that the second receiving groove 5021 can limit the second column 402 and prevent the second column 402 from being misaligned in the first receiving groove 50121.

[0115] In some embodiments, the battery housing 100 has a receiving cavity 101, defined by an upper cover 102 and a lower cover 103, and a sealing gasket 502 has a spacer 6 on one side near the bottom of the receiving cavity 101, such as... Figure 1 and 3 As shown, the isolation member 6 includes an isolation part 601 and a connecting part 602. The isolation part 601 is spaced apart from the bottom of the receiving cavity 101. The projection of the second column 402 in the direction of the isolation part 601 is located on the isolation part 601, and a gap is formed between it and the end of the isolation part 601 away from the through hole 2.

[0116] The connecting part 602 is disposed at one end of the isolation part 601 near the through hole 2 and extends in the direction of the opening. The connecting part 602 is fixedly connected to the sealing gasket 502.

[0117] The battery casing 100 of this embodiment of the invention can prevent the second column 402 from contacting the bottom of the receiving cavity 101 by setting the isolation member 6, that is, it can prevent the second column 402 from contacting the casing 1 and causing a short circuit in the battery, thereby improving the safety performance of the battery.

[0118] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A battery casing, characterized in that, The battery casing (100) includes an upper cover (102), a lower casing (103), and a welding part (7). The upper cover (102) covers the lower casing (103). The upper cover (102) and the lower casing (103) are connected by the welding part (7). The plane of the contact surface of the upper cover (102) and the lower casing (103) is perpendicular to the extension direction of the welding part (7). The difference between the length L1 of the upper cover (102) and the length L2 of the lower shell (103) is L1-L2=0.05~0.15mm; The difference between the width W1 of the upper cover (102) and the width W2 of the lower shell (103) is W1-W2=0.05~0.15mm.

2. The battery casing according to claim 1, characterized in that, The thickness of the top cover (102) is 0.05~0.2mm.

3. The battery casing according to claim 1, characterized in that, The wall thickness of the lower shell (103) is 0.15~0.3mm.

4. The battery casing according to claim 1, characterized in that, The upper cover (102) is a flat plate structure; The lower shell (103) includes a bottom wall (1031) and a side wall (1032). The side wall (1032) is disposed along the outer edge of the bottom wall (1031) and extends in the vertical direction. The upper cover (102) is connected to the side wall (1032) through the welding part (7).

5. The battery casing according to claim 1, characterized in that, The height of the welded part (7) inside the lower shell (103) is 0.1~0.3mm.

6. The battery casing according to claim 1, characterized in that, The welded part (7) includes a first edge (701) and a second edge (702), and the projections of the first edge (701) and the second edge (702) in the direction of the lower shell (103) are both located within the contact surface.

7. The battery casing according to claim 6, characterized in that, The distance between the projection of the first edge (701) in the direction of the lower shell (103) and the outer wall of the lower shell (103) is 0~0.1mm; The distance between the projection of the second edge (702) in the direction of the lower shell (103) and the inner wall of the lower shell (103) is 0~0.1mm.

8. A battery, characterized in that, include: The battery casing (100) as described in any one of claims 1-7; A pole post (4) assembly, wherein the pole post (4) assembly is disposed on the lower housing (103), and the pole post (4) assembly comprises: The pole post (4) includes a first post (401), a second post (402) and a third post (403). The first post (401) is located outside the lower shell (103), the second post (402) is located inside the lower shell (103), and the third post (403) passes through the lower shell (103) and connects the first post (401) and the second post (402). An insulating sealing structure (5) is provided between the third column (403) and the lower shell (103), between the first column (401) and the lower shell (103), and between the second column (402) and the lower shell (103). The insulating sealing structure (5) is interference-fitted with the third column (403). A pressure ring (3) is disposed between the first column (401) and the insulating sealing structure (5), or the pressure ring (3) is disposed between the second column (402) and the insulating sealing structure (5).

9. The battery according to claim 8, characterized in that, The insulating and sealing structure (5) includes an insulating gasket (501) and a sealing gasket (502). The sealing gasket (502) is located between the housing (1) and the second column (402), one end face of the insulating gasket (501) abuts against the sealing gasket (502), and the other end face of the insulating gasket (501) abuts against the pressure ring (3); or, The sealing gasket (502) is located between the housing (1) and the pressure ring (3). One end face of the insulating gasket (501) abuts against the sealing gasket (502), and the other end face of the insulating gasket (501) abuts against the first column (401).

10. The battery according to claim 9, characterized in that, The diameter of the first column (401) is smaller than the diameter of the second column (402), and the diameter of the first column (401) is larger than the diameter of the third column (403); or The diameter of the first column (401) is smaller than the diameter of the second column (402), and the diameter of the first column (401) is larger than the diameter of the third column (403).

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