Battery shell and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell body and a cover plate, the cover plate comprises a sealing part, an insertion part and a guide part, one side of the insertion part is connected with the sealing part, the other side of the insertion part is connected with the guide part, and the shell body is welded with the cover plate. A welding structure is formed at the junction of the shell body and the cover plate, the length of the overlapping area of the welding structure and the shell body in the first direction is the maximum fusion width size X, the length of the overlapping area of the welding structure, the shell body and the inserting part in the first direction is the effective fusion width size Y, and Y / X is larger than or equal to 0.5 and smaller than 1. According to the method, the required effective fusion width size Y is controlled by utilizing the visual maximum fusion width size X during welding, so that on one hand, the situation that the welding strength is low due to the fact that the effective fusion width size is too small is avoided, and on the other hand, the situation that the effective fusion width size is too large is avoided, and therefore the probability that molten beads are generated after welding is increased, and the product quality of a battery shell is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery housing and a battery. Background Art

[0002] For a battery, the battery housing and the electrode assembly are indispensable structures that make up the battery. The electrode assembly and the battery housing together form a complete battery. The electrode assembly is the core component of the battery, responsible for storing and releasing electrical energy. The electrode assembly is mainly composed of a positive electrode material, a negative electrode material, an electrolyte, and a separator. The electrode assembly is the smallest unit of a power battery and also the electrical energy storage unit. It must have a high energy density to store as much electrical energy as possible; the battery housing is a container that encloses the electrode assembly. It not only provides physical protection to prevent the electrode assembly from being affected by the external environment, but also helps the electrode assembly dissipate heat and maintain the stability of the battery. Therefore, the performance of the battery housing has an important impact on the assembly, safety, and performance of the battery.

[0003] Generally, the battery housing includes a housing body and a cover plate. The cover plate is disposed on the housing body to form a chamber for accommodating the electrode assembly. After the cover plate and the housing body are assembled, the cover plate and the housing body are connected by welding. However, since the shape of the welded structure formed after welding is an irregular shape, the size of the actual effective fusion width is uncertain. Or the welding strength is too low due to the too small effective fusion width after welding, or the probability of generating weld beads increases due to the too large effective fusion width, affecting the product quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery housing and a battery, which have high welding strength, a small probability of generating weld beads, and good product quality.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] On the one hand, a battery housing is provided, and the battery housing includes:

[0007] A housing body, which is a hollow housing structure with an open end;

[0008] A cover plate, which includes a closing portion, a plugging portion, and a guiding portion. One side of the plugging portion is connected to the closing portion, and the other side of the plugging portion is connected to the guiding portion. The guiding portion is used to guide the plugging portion to be inserted into the housing body. The closing portion is disposed on the open end of the housing body and is used to close the housing body;

[0009] The outer shell body is welded to the cover plate, and a welding structure is formed at the junction of the outer shell body and the cover plate. The length of the overlapping area of the welding structure and the outer shell body in the first direction is the maximum fusion width dimension X, and the length of the overlapping area of the welding structure, the outer shell body and the plug-in part in the first direction is the effective fusion width dimension Y, and 0.5≤Y / X<1 is satisfied.

[0010] Optionally, the maximum fusion width dimension X of the overlapping area of the welding structure and the outer shell body in the first direction satisfies 0.8mm≤X≤1.5mm.

[0011] Optionally, the length dimension of the plug-in part in the first direction is A, and 0.15mm≤A - Y≤0.5mm is satisfied.

[0012] Optionally, a first surface is provided on the side of the outer shell body facing away from the plug-in part. The distance between the first surface and the boundary of the welding structure extending into the cover plate in the second direction is the fusion depth dimension W, and 1.6mm≤W≤2mm is satisfied.

[0013] Optionally, the length dimension of the guiding part in the first direction is B, and 0.6mm≤A + B≤1.8mm is satisfied.

[0014] Optionally, the length dimension of the closing part in the first direction is C, and 0.5mm≤C≤0.75mm is satisfied.

[0015] Optionally, the sum of the length dimension A of the plug-in part in the first direction, the length dimension B of the guiding part in the first direction, and the length dimension C of the closing part in the first direction satisfies 1.5mm≤A + B + C≤2.5mm.

[0016] Optionally, a second surface is provided on the side of the guiding part facing away from the plug-in part. Guiding inclined surfaces are provided on both sides of the guiding part in the second direction. The angle between each guiding inclined surface and the second surface is θ, and 15°≤θ≤45° is satisfied.

[0017] Optionally, the width dimension of the overlapping area of the closing part and the outer shell body is Z, and 0.25mm≤Z≤0.8mm is satisfied.

[0018] On the other hand, a battery is provided. The battery includes a pole group and the battery outer shell as described in any one of the above, and the pole group is arranged inside the battery outer shell.

[0019] Advantages of the present invention:

[0020] The present invention provides a battery housing, which includes a housing body and a cover plate composed of a closed portion, a plug-in portion, and a guiding portion. By defining the maximum fusion width dimension X of the overlapping area of the welding structure and the housing body in the first direction, and the effective fusion width dimension Y of the overlapping area of the welding structure, the housing body, and the plug-in portion in the first direction, such that 0.5 ≤ Y / X < 1, thereby using the maximum fusion width dimension X that is visible during welding to control the required effective fusion width dimension Y. On the one hand, it avoids the situation where the effective fusion width dimension Y is too small, resulting in low welding strength. On the other hand, it avoids the situation where the effective fusion width dimension Y is too large, thereby increasing the probability of forming welding beads after welding, so as to improve the product quality of the battery housing.

[0021] The present invention also provides a battery. By applying the above-mentioned battery housing, since the battery housing has a high welding strength and a lower probability of generating welding beads, the overall structural strength and sealing performance of the battery after assembly are improved. Moreover, it avoids the internal electrode group of the battery from being scratched during assembly due to the existence of welding beads, thereby improving the product quality of the battery. Brief Description of the Drawings

[0022] Figure 1 is a partial structural cross-sectional view of the battery housing provided by the present invention when the housing body and the cover plate are assembled but not welded;

[0023] Figure 2 is a schematic diagram of the dimensional relationship of the relevant structure after the housing body and the cover plate of the battery housing provided by the present invention are welded.

[0024] In the figure:

[0025] 1. Housing body; 11. First surface;

[0026] 2. Cover plate; 21. Closed portion; 22. Plug-in portion; 23. Guiding portion; 231. Second surface; 232. Guiding inclined surface. Detailed Description of the Embodiment

[0027] The following further elaborates on the present invention in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Additionally, it should be noted that for the sake of convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0028] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0030] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] Since the shape of the welding structure formed after welding the housing and the cover plate that constitute the battery housing is an irregular shape, it leads to the uncertainty of the size of the actual effective weld width, or the welding strength is too low due to the too small effective weld width after welding, or the probability of generating weld beads increases due to the too large effective weld width, affecting the product quality.

[0032] Therefore, in order to achieve the controllability of the effective weld width size, ensure the structural strength after welding, reduce the probability of generating weld beads, and improve the product quality, this embodiment provides a battery housing.

[0033] Such as Figures 1 to 2As shown in the figure, the battery housing includes a housing body 1 and a cover plate 2. The housing body 1 is a hollow shell structure with an open end. The cover plate 2 includes a closing portion 21, a plugging portion 22, and a guiding portion 23. One side of the plugging portion 22 is connected to the closing portion 21, and the other side of the plugging portion 22 is connected to the guiding portion 23. The guiding portion 23 is used to guide the plugging portion 22 to be inserted into the housing body 1. The closing portion 21 covers the open end of the housing body 1 and is used to seal the housing body 1. The housing body 1 and the cover plate 2 are welded, and a welding structure is formed at the junction of the housing body 1 and the cover plate 2. The length of the overlapping area of the welding structure and the housing body 1 in the first direction is the maximum weld width dimension X, and the length of the overlapping area of the welding structure, the housing body 1, and the plugging portion 22 in the first direction is the effective weld width dimension Y, and 0.5 ≤ Y / X < 1 is satisfied.

[0034] The battery housing includes a housing body 1 and a cover plate 2 composed of a closing portion 21, a plugging portion 22, and a guiding portion 23. By defining the maximum weld width dimension X of the overlapping area of the welding structure and the housing body 1 in the first direction and the effective weld width dimension Y of the overlapping area of the welding structure, the housing body 1, and the plugging portion 22 in the first direction, so that the two satisfy 0.5 ≤ Y / X < 1, thereby using the maximum weld width dimension X that is visible during welding to control the required effective weld width dimension Y. On the one hand, it avoids the situation that the effective weld width dimension Y is too small, resulting in low welding strength. On the other hand, it avoids the situation that the effective weld width dimension Y is too large, thus increasing the probability of forming weld beads after welding, so as to improve the product quality of the battery housing.

[0035] Before actually performing the welding operation, it is necessary to first set the required effective weld width dimension Y, and then use the relationship Y / X to determine the range of the visible maximum weld width dimension X, so that during the welding operation, by controlling the maximum weld width dimension X, the indirect control of the effective weld width dimension Y can be realized. On the one hand, it avoids the situation that the effective weld width dimension Y is too small, affecting the structural strength after welding. On the other hand, it avoids the situation that the effective weld width dimension Y is too large, resulting in a high probability of forming weld beads after welding. The battery housing can be used in various different types of batteries, such as blade batteries, square shell batteries, or large cylindrical batteries, etc.

[0036] In order to verify the influence of the maximum weld width dimension X and the effective weld width dimension Y on the welding of the battery housing, after setting the maximum weld width dimension X and the effective weld width dimension Y, a strength test is carried out after welding. If the pressure resistance value is greater than 1.2 MPa, it is qualified; if the pressure resistance value is less than 1.2 MPa, it is unqualified. At the same time, observe whether weld beads appear. As shown in Table 1, eight groups of examples and four groups of comparative examples are provided for verification.

[0037] Table 1

[0038]

[0039] In Example 1, the maximum melt width dimension X is set to 0.99 mm, the effective melt width dimension Y is set to 0.51 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 0.52. After pressure testing, its pressure resistance value is 1.32 MPa, and no generation of molten beads is observed.

[0040] In Example 2, the maximum melt width dimension X is set to 1.05 mm, the effective melt width dimension Y is set to 0.66 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 0.63. After pressure testing, its pressure resistance value is 1.41 MPa, and no generation of molten beads is observed.

[0041] In Example 3, the maximum melt width dimension X is set to 0.92 mm, the effective melt width dimension Y is set to 0.64 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 0.7. After pressure testing, its pressure resistance value is 1.56 MPa, and no generation of molten beads is observed.

[0042] In Example 4, the maximum melt width dimension X is set to 1.14 mm, the effective melt width dimension Y is set to 0.92 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 0.81. After pressure testing, its pressure resistance value is 1.65 MPa, and no generation of molten beads is observed.

[0043] In Example 5, the maximum melt width dimension X is set to 1.33 mm, the effective melt width dimension Y is set to 1.08 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 0.81. After pressure testing, its pressure resistance value is 1.62 MPa, and no generation of molten beads is observed.

[0044] In Example 6, the maximum melt width dimension X is set to 0.88 mm, the effective melt width dimension Y is set to 0.72 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 0.82. After pressure testing, its pressure resistance value is 1.76 MPa, and no generation of molten beads is observed.

[0045] In Example 7, the maximum melt width dimension X is set to 1.5 mm, the effective melt width dimension Y is set to 1.28 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 0.85. After pressure testing, its pressure resistance value is 1.81 MPa, and no generation of molten beads is observed.

[0046] In Example 8, the maximum melt width dimension X is set to 0.87 mm, the effective melt width dimension Y is set to 0.75 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 0.86. After pressure testing, its pressure resistance value is 1.82 MPa, and no generation of molten beads is observed.

[0047] As can be seen from Examples 1 to 8, when the ratio of the effective melt width dimension Y to the maximum melt width dimension X is in the range of 0.5 ≤ Y / X < 1, the withstand voltage value is greater than 1.2 MPa, and no molten beads are observed. This makes the battery housing have a high welding strength under this condition while avoiding the generation of molten beads, thus effectively improving the product quality after welding the battery housing.

[0048] In Comparative Example 1, the maximum melt width dimension X is set to 1.05 mm, and the effective melt width dimension Y is set to 0.44 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 0.42. After pressure testing, the withstand voltage value is 1.08 MPa, and no molten beads are observed.

[0049] In Comparative Example 2, the maximum melt width dimension X is set to 1.28 mm, and the effective melt width dimension Y is set to 0.56 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 0.44. After pressure testing, the withstand voltage value is 1.13 MPa, and no molten beads are observed.

[0050] As can be seen from Comparative Example 1 to Comparative Example 2, when the ratio of the effective melt width dimension Y to the maximum melt width dimension X is less than the minimum value in the range of 0.5 ≤ Y / X < 1, the withstand voltage value is less than 1.2 MPa, and no molten beads are observed. Although the generation of molten beads is avoided under this condition, the welding strength after welding is poor for the battery housing.

[0051] In Comparative Example 3, the maximum melt width dimension X is set to 1.18 mm, and the effective melt width dimension Y is set to 1.36 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 1.15. After pressure testing, the withstand voltage value is 2.13 MPa, and molten beads are observed.

[0052] In Comparative Example 4, the maximum melt width dimension X is set to 1.38 mm, and the effective melt width dimension Y is set to 1.7 mm. At this time, the ratio of the effective melt width dimension Y to the maximum melt width dimension X is 1.23. After pressure testing, the withstand voltage value is 2.18 MPa, and molten beads are observed.

[0053] As can be seen from Comparative Example 3 to Comparative Example 4, when the ratio of the effective melt width dimension Y to the maximum melt width dimension X is greater than the maximum value in the range of 0.5 ≤ Y / X < 1, the withstand voltage value is greater than 1.2 MPa, and molten beads are observed. Although the battery housing has a high welding strength under this condition, the generation of molten beads reduces the product quality.

[0054] Optionally, the maximum weld width dimension X of the overlapping area of the welding structure and the shell body 1 along the first direction satisfies 0.8mm≤X≤1.5mm. The maximum weld width dimension X is limited to satisfy 0.8mm≤X≤1.5mm, so as to determine the size range of the effective weld width dimension Y according to the relationship Y / X, so that when the effective weld width dimension Y is in this range, it has a higher welding strength and a lower probability of generating molten beads. In this embodiment, the maximum weld width dimension X can be any value between 0.8mm and 1.5mm or a range between any two values, such as 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.

[0055] Optionally, the length dimension of the plug-in portion 22 along the first direction is A, and satisfies 0.15mm≤AY≤0.5mm. By limiting the difference between the dimension A of the plug-in portion 22 along the first direction and the effective weld width dimension Y, so that both satisfy 0.15mm≤AY≤0.5mm, it is ensured that the remaining safety distance of the plug-in portion 22 after removing the effective weld width dimension Y meets the requirements, on the one hand, avoiding the safety distance from being too large to affect the welding strength, and on the other hand, avoiding the safety distance from being too small to affect the electrode group during welding.

[0056] In this embodiment, the difference between the dimension A of the plug-in portion 22 along the first direction and the effective weld width dimension Y, that is, the safety distance can be any value between 0.15 mm and 0.5 mm or a range between any two values, for example, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc.

[0057] Optionally, the housing body 1 is provided with a first surface 11 on one side away from the plug-in portion 22, and the distance between the first surface 11 and the boundary of the welding structure penetrating into the cover plate 2 along the second direction is the penetration dimension W, and satisfies 1.6mm≤W≤2mm. By limiting the penetration dimension W, it satisfies 1.6mm≤W≤2mm, thereby ensuring sufficient penetration and structural strength after welding on the one hand, and reducing the probability of molten beads during welding on the other hand, improving welding yield, avoiding rework, and increasing production costs.

[0058] In this embodiment, the penetration dimension W may be any value between 1.6 mm and 2 mm or a range between any two values, such as 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0059] Optionally, the length dimension of the guiding portion 23 in the first direction is B, and 0.6 mm ≤ A + B ≤ 1.8 mm is satisfied. By limiting the sum of the length dimension B of the guiding portion 23 in the first direction and the length dimension A of the plugging portion 22 in the first direction, such that 0.6 mm ≤ A + B ≤ 1.8 mm, on the one hand, it is avoided that the depth of the cover plate 2 inserted into the housing body 1 is too shallow, reducing the structural strength after assembly, and on the other hand, it is avoided that the depth of the cover plate 2 inserted into the housing body 1 is too deep, resulting in a large occupied space, thereby restricting the volume of the electrode group and reducing the energy density.

[0060] In this embodiment, the sum of the length dimension B of the guiding portion 23 in the first direction and the length dimension A of the plugging portion 22 in the first direction can be any value between 0.6 mm and 1.8 mm or the range between any two values, such as 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, etc.

[0061] Optionally, the length dimension of the closing portion 21 in the first direction is C, and 0.5 mm ≤ C ≤ 0.75 mm is satisfied. By limiting the length dimension C of the closing portion 21 in the first direction, such that 0.5 mm ≤ C ≤ 0.75 mm, on the one hand, it is avoided that the size of the closing portion 21 is too small, resulting in a weak structural strength of the closing portion 21 and deformation when being impacted, affecting the sealing performance, and on the other hand, it is avoided that the structural size of the closing portion 21 is too large, increasing the manufacturing cost.

[0062] In this embodiment, the length dimension C of the closing portion 21 in the first direction can be any value between 0.5 mm and 0.75 mm or the range between any two values, such as 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, etc.

[0063] Optionally, the sum of the length dimension A of the plugging portion 22 in the first direction, the length dimension B of the guiding portion 23 in the first direction, and the length dimension C of the closing portion 21 in the first direction satisfies 1.5 mm ≤ A + B + C ≤ 2.5 mm. By limiting the sum of the length dimension A of the plugging portion 22 in the first direction, the length dimension B of the guiding portion 23 in the first direction, and the length dimension C of the closing portion 21 in the first direction, such that 1.5 mm ≤ A + B + C ≤ 2.5 mm, on the one hand, it is avoided that the overall structural size of the cover plate 2 is too small, resulting in too low a structural strength of the cover plate 2 and poor pressure-bearing capacity, and on the other hand, it is avoided that the overall structural size of the cover plate 2 is too large, increasing the manufacturing cost.

[0064] In this embodiment, the sum of the length dimension A of the plug-in portion 22 along the first direction, the length dimension B of the guide portion 23 along the first direction, and the length dimension C of the closing portion 21 along the first direction can be any value between 1.5 mm and 2.5 mm or a range between any two values, for example, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, etc.

[0065] Optionally, a second surface 231 is provided on one side of the guide portion 23 away from the plug-in portion 22, and guide slopes 232 are provided on both sides of the guide portion 23 along the second direction, and the angle between each guide slope 232 and the second surface 231 is θ, and satisfies 15°≤θ≤45°. By limiting the angle θ between the guide slope 232 and the second surface 231 to satisfy 15°≤θ≤45°, it is ensured that the guide portion 23 has a good guiding function while not occupying too much space, thereby limiting the volume of the pole group and reducing the energy density.

[0066] In this embodiment, the angle θ between the guide slope 232 and the second surface 231 can be any value between 15° and 45° or a range between any two values, such as 15°, 20°, 25°, 30°, 35°, 40°, 45°, etc.

[0067] Optionally, the width dimension of the overlapping area between the closing portion 21 and the shell body 1 is Z, and satisfies 0.25mm≤Z≤0.8mm, and the width dimension Z is perpendicular to the first direction. By limiting the width dimension Z of the overlapping area between the closing portion 21 and the shell body 1 to satisfy 0.25mm≤Z≤0.8mm, it is ensured that there is a sufficient contact area between the closing portion 21 and the shell body 1, thereby facilitating the assembly of the two on the one hand, and ensuring sufficient structural strength after assembly on the other hand.

[0068] In this embodiment, the width dimension Z of the overlapping area between the closing portion 21 and the shell body 1 can be any value between 0.25 mm and 0.8 mm or a range between any two values, for example, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, etc.

[0069] In this embodiment, a battery is further provided. The battery includes a terminal post and the above-mentioned battery case, and the electrode assembly is disposed within the battery case. By applying the above-mentioned battery case, since the battery case has a high welding strength and a lower probability of generating solder balls, the overall structural strength and sealing performance of the assembled battery are improved, and the electrode assembly within the battery is prevented from being scratched during assembly due to the presence of solder balls, thereby improving the product quality of the battery.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. Battery housing, characterized in that, The battery housing comprises: The outer shell body is a hollow shell structure with an opening; A cover plate, the cover plate comprising a closing portion, a plug-in portion and a guide portion, one side of the plug-in portion is connected to the closing portion, the other side of the plug-in portion is connected to the guide portion, the guide portion is used to guide the plug-in portion to be inserted into the shell body, the closing portion is covered at the open portion of the shell body and is used to close the shell body; The shell body is welded to the cover plate, and a welding structure is formed at the junction of the shell body and the cover plate. The length of the overlapping area of the welding structure and the shell body along the first direction is the maximum weld width dimension X, and the length of the overlapping area of the welding structure, the shell body and the plug-in portion along the first direction is the effective weld width dimension Y, and 0.5≤Y / X<1 is satisfied.

2. The battery housing according to claim 1, wherein, A maximum weld width dimension X of an overlapping area between the welding structure and the shell body along the first direction satisfies 0.8 mm ≤ X ≤ 1.5 mm.

3. The battery housing according to claim 1, characterized in that, The length dimension of the plug-in portion along the first direction is A, and satisfies 0.15mm≤AY≤0.5mm.

4. The battery housing according to claim 1, characterized in that, A first surface is provided on a side of the shell body away from the plug-in portion, and a distance between the first surface and a boundary of the welding structure penetrating into the cover plate along the second direction is a penetration dimension W, and satisfies 1.6 mm≤W≤2 mm.

5. The battery housing according to claim 4, characterized in that, The length dimension of the guide portion along the first direction is B, and satisfies 0.6 mm≤A+B≤1.8 mm.

6. The battery housing according to claim 5, characterized in that, The length dimension of the closing portion along the first direction is C, and satisfies 0.5 mm ≤ C ≤ 0.75 mm.

7. The battery housing according to claim 6, characterized in that, The sum of a length dimension A of the plug-in portion along the first direction, a length dimension B of the guide portion along the first direction, and a length dimension C of the closing portion along the first direction satisfies 1.5 mm ≤ A + B + C ≤ 2.5 mm.

8. The battery housing according to claim 1, characterized in that, A second surface is provided on a side of the guide portion away from the plug-in portion, and guide slopes are provided on both sides of the guide portion along the second direction. The angle between each guide slope and the second surface is θ, and satisfies 15°≤θ≤45°.

9. The battery housing according to claim 1, characterized in that, The width dimension of the overlapping area between the sealing portion and the shell body is Z, and satisfies 0.25mm≤Z≤0.8mm.

10. A battery, characterized in that, The battery comprises a pole group and a battery casing as claimed in any one of claims 1 to 9, wherein the pole group is arranged in the battery casing.

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