Battery casing and battery including the same

Abstract

The present invention relates to the technical field of batteries, and specifically proposes a battery shell and a battery including the same. The battery shell includes a shell body, and the shell body includes at least two oppositely arranged first side surfaces and at least two oppositely arranged second side surfaces, the area of ​​the first side surface is greater than the area of ​​the second side surface; the first side surface and the second side surface surround to form a receiving cavity, and form two upper and lower openings, the first side surface or the second side surface forms an interface end, and the interface end is welded to form a first welding line; the adjacent first side surface and the second side surface are connected by a transition portion, and the transition portion and the surface where the first welding line is located form a boundary line, the first welding line deviates from the first center line of the surface where it is located in a direction perpendicular to the opening portion, and the distance between the first welding line and the nearest boundary line is a, 1mm≤a≤50mm. The transition portion is in the edge corner area, the structure is stable, the welding line is close to the transition portion, the strength is relatively large, the battery shell will not be deformed during welding, and the molding yield of the battery shell is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and specifically provides a battery casing and a battery comprising the same. Background Art

[0002] In the relevant technology, square batteries generally refer to batteries with square steel shells, which have high energy density and long cycle life, and therefore have been widely used in many fields.

[0003] However, during the forming process of the stainless steel shell, the shell joints need to be welded. However, due to the high welding temperature and insufficient strength of the shell, the shell surface is likely to be deformed, affecting the forming yield. Summary of the invention

[0004] The purpose of the present invention is to solve at least part of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:

[0005] In the first aspect, the present application proposes a battery shell, which includes a shell body formed in a surrounding manner, the shell body includes at least two oppositely arranged first side surfaces and at least two oppositely arranged second side surfaces, the area of ​​the first side surface is greater than the area of ​​the second side surface; the first side surface and the second side surface surround to form a accommodating cavity, and form two upper and lower opening portions, the first side surface or the second side surface forms an interface end, and the interface end is welded and connected to form a first welding line; the adjacent first side surface and the second side surface are connected by a transition portion, the surface where the first welding line is located has a first center line, the first center line is perpendicular to the opening portion, the first welding line deviates from the first center line, and a boundary line is formed between the surface where the first welding line is located and the transition portion, and the distance between the first welding line and the nearest boundary line is a, 1mm≤a≤50mm.

[0006] In some embodiments, the first welding line is on the first side, 1 mm≤a≤48 mm.

[0007] In some embodiments, a ratio of the length L of the first side to a is 2≤L / a≤100.

[0008] In some embodiments, the first welding line is on the second side, 1.5 mm≤a≤50 mm.

[0009] In some embodiments, a ratio of the width W of the second side to a is 1≤W / a≤80.

[0010] In some embodiments, the transition portion includes an arc-shaped edge, and the radian of the arc-shaped edge is r, then 0.3≤r×a≤80, unit: rad·mm.

[0011] In some embodiments, the hardness of the shell body is b, then 0.01≤a / b≤0.83, unit: mm / HRB.

[0012] In some embodiments, the shell body is steel, then 0.01≤a / b≤0.8, unit: mm / HRB.

[0013] In some embodiments, the first welding line width is d, then 0.004≤d / a≤2.

[0014] In some embodiments, the width d of the first welding line is in the range of 0.2 mm≤d≤2 mm.

[0015] In a second aspect, the present application proposes a battery, which includes the battery housing of the first aspect, at least one battery cell disposed inside the battery housing, and a cover plate for sealing an opening on the battery housing.

[0016] In some embodiments, the cover plate and the battery casing are connected by welding to form a second welding line.

[0017] In some embodiments, the penetration of the second weld line is S, and the width of the first weld line is d, 0.01 mm. 2 ≤S×d≤1.8mm 2 .

[0018] In some embodiments, in the height direction of the battery, the second welding line and the first welding line do not overlap, and the second welding line is located above the first welding line, and the distance between the top end of the first welding line and the cover plate is N, 0mm<N≤0.9mm.

[0019] In some embodiments, the first welding line is on the second side, and the battery cell is a laminated battery cell, and the total width of the battery cell is W1, 13.8 mm 2 ≤W1×a≤3990mm 2 .

[0020] In some embodiments, the first welding wire is on the second side surface, and the battery cell is a wound battery cell. The portion of the battery cell corresponding to the second side surface has a second center line, the second center line is perpendicular to the opening, and the second center line and the first welding wire are spaced apart in the width direction of the battery.

[0021] In some embodiments, a distance between the second center line and the first welding line in the battery width direction is D1, and 0.5 mm≤D1≤40 mm.

[0022] The technical solution provided by the present invention has at least the following technical effects:

[0023] In the present invention, the transition portion of the shell body is located in the edge corner area, the structure is more stable, the welding line is close to the transition portion, and the transition portion is relatively strong, so the battery shell will not be deformed when the welding line is formed, thereby improving the molding yield of the battery shell.

[0024] Specifically, the battery shell is formed around the shell body by stamping or stretching, which has a high processing efficiency. However, after forming, the shell body will be thinned due to the stamping or stretching operation. When the first welding line exists in the middle position of the shell body surface or is too far away from the edge, the middle area of ​​the shell body side is the weakest area. Therefore, the shell body is prone to deformation after welding, so that when forming a battery pack, the space utilization and assembly efficiency are not high. By welding in the above manner, the first welding line is set at a position close to the edge of the shell body, which improves the strength at the first welding line. During the high-temperature welding process, the shell body will not be deformed, thereby improving the battery grouping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to better combine the contents shown in the drawings of the specification with the contents described in the specific implementation methods, the drawings of the specification are briefly introduced below. It can be understood that the drawings of the specification mentioned below only schematically show some embodiments of the relevant technical solutions and the technical solutions of the present invention. Without paying creative labor, those skilled in the art can also make drawings showing other embodiments.

[0026] Specifically, the annotations of the drawings in the specification are as follows:

[0027] Figure 1 It is a schematic diagram of the structure of the battery housing according to some embodiments of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the battery described in some embodiments of the present invention;

[0029] Figure 3 Schematic diagram of an explosion of a battery according to some embodiments of the present invention.

[0030] Specifically, the annotations of the accompanying drawings in the specification are as follows:

[0031] 100. Battery; 110. Battery case; 111. Case body; A. First side surface; B. Second side surface; C. Transition portion; e1. First welding line; e2. Second welding line; f1. First center line; f2. Second center line; g. Junction line; D. Opening; 120. Cover plate; 130. Battery cell. DETAILED DESCRIPTION

[0032] In order to make the contents of the embodiments of the present invention clearer, the following description will be made in conjunction with the accompanying drawings. It can be understood that the contents mentioned below are only some embodiments of the present invention, and all embodiments are listed in detail. Therefore, without paying creative work, other embodiments obtained based on the following embodiments fall within the protection scope of the present invention.

[0033] It should be understood that the terms used herein are only for the purpose of describing specific embodiments and are not intended to strictly limit the technical solutions unless the context clearly indicates otherwise. For example, the use of "a", "an" and "the" to modify a feature does not exclude that the feature may also be plural in other embodiments.

[0034] It should be understood that the terms "include", "comprises", and "have" are open ended, indicating the presence of the stated features, but not excluding the possibility that the embodiment may have other features. Similarly, the use of the terms first, second, etc. in the text to describe multiple features only means to distinguish one feature from another, and unless the context clearly indicates otherwise, such terms do not imply an order or sequence.

[0035] It should be understood that, unless the context clearly indicates otherwise, the terms "dispose", "connect", and "install" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected or indirectly connected through a medium. For those skilled in the art, the specific meanings of the above terms in the text can be understood according to the specific circumstances.

[0036] In addition, for the convenience of description, the text will use terms of spatial relative relationships to illustrate the position of one feature relative to another feature, for example, "inside", "outside", "end", "side", "top", "middle", "bottom", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations in addition to those shown in the drawings of the specification.

[0037] The embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0038] First, refer to Figure 1 The present application proposes a battery shell 110, which includes a shell body 111 formed in a surrounding manner, the shell body 111 includes at least two oppositely arranged first side surfaces A and at least two oppositely arranged second side surfaces B, the area of ​​the first side surface A is greater than the area of ​​the second side surface B; the first side surface A and the second side surface B surround to form a accommodating cavity, and form two upper and lower opening portions D, the first side surface A or the second side surface B forms an interface end, and the interface end is welded and connected to form a first welding line e1; the adjacent first side surface A and the second side surface B are connected through a transition portion C, the surface where the first welding line e1 is located has a first center line f1, the first center line f1 is perpendicular to the opening portion D, the first welding line e1 deviates from the first center line f1, and a boundary line g is formed between the surface where the first welding line e1 is located and the transition portion C, and the distance between the first welding line e1 and the nearest boundary line g is a, 1mm≤a≤50mm.

[0039] In the present invention, the transition portion C of the shell body 111 is located in the edge corner area, and the structure is more stable. The first welding line e1 is close to the transition portion C, and the transition portion C is relatively strong. Therefore, when the first welding line e1 is formed by welding, the battery shell 110 will not be deformed, thereby improving the molding yield of the battery shell 110.

[0040] Specifically, the battery shell 110 is formed by stamping or stretching to form the shell body 111 around it, which has a high processing efficiency. However, after forming, due to the stamping or stretching operation, the shell body 111 will be thinned. When the first welding line e1 is in the middle position of the surface of the shell body 111 or too far away from the edge, since the middle area of ​​the side of the shell body 111 is the weakest area, the shell body 111 is easy to deform after welding, so when forming a battery pack, the space utilization rate and assembly efficiency are not high; and by welding in the above manner, the first welding line e1 is set at a position close to the edge of the shell body 111, which improves the strength of the first welding line e1, and the shell body 111 will not deform during high-temperature welding, thereby improving the grouping efficiency of the battery 100. However, the first welding line e1 cannot be too close to the transition part C to avoid stress concentration and cracking of the first welding line e1. Therefore, the distance a between the first welding line e1 and the nearest boundary line g should be moderate, for example, a can be 1mm, 10mm, 20mm, 50mm.

[0041] In some embodiments, the first welding line e1 is on the first side surface A, 1 mm≤a≤48 mm.

[0042] In some embodiments, the first welding line e1 is on the first side surface A. Since the first side surface A has a larger area and is more easily deformed during welding, the welding distance from the transition portion C is closer, which can better reinforce the first welding line e1. Therefore, a can be 1mm, 10mm, or 48mm.

[0043] In some embodiments, a ratio of a length L of the first side surface A to a length L is 2≤L / a≤100.

[0044] In some embodiments, the ratio of the length of the first side surface A to the distance of the first welding line e1 from the intersection line g should be controlled within an appropriate range. If the ratio is too small, it means that the distance of the first welding line e1 from the intersection line g is too large, and during the welding process, it is close to the first center line f1 of the surface where it is located, which easily causes deformation of the surface where the first welding line e1 is located; if the ratio is too large, it means that the distance of the first welding line e1 from the intersection line g is too close, and due to the large stress at the position of the transition part C, the first welding line e1 will crack, affecting the welding effect. Therefore, the value of L / a should be moderate, for example, L / a can be 2, 50, or 100.

[0045] In some embodiments, the first welding line e1 is on the second side surface B, 1.5 mm≤a≤50 mm.

[0046] In some embodiments, the first welding line e1 is on the second side surface B. Since the area of ​​the second side surface B is small, the stress of the transition portion C adjacent to the second side surface B near the second side surface B will be relatively large. When the stress is large, if the first welding line e1 is too close to the boundary line g, the first welding line e1 is prone to cracking under the action of the stress. Therefore, compared with the case where the first welding line e1 is located on the first side surface A, the distance between the first welding line e1 and the transition portion C is slightly larger. Therefore, a can be 1.5 mm, 10 mm, or 50 mm.

[0047] In some embodiments, a ratio of a width W of the second side surface B to a is 1≤W / a≤80.

[0048] In some embodiments, the ratio of the width of the second side surface B to the distance of the first welding line e1 from the intersection line g should be controlled within an appropriate range. If the ratio is too small, it means that the distance of the first welding line e1 from the intersection line g is too large, and during the welding process, it is close to the first center line f1 of the surface where it is located, which easily causes deformation of the surface where the first welding line e1 is located; if the ratio is too large, it means that the distance of the first welding line e1 from the intersection line g is too close, and due to the large stress at the position of the transition part C, the first welding line e1 will crack, affecting the welding effect. Therefore, the value of W / a should be moderate, for example, W / a can be 1, 30, or 80.

[0049] It should be noted that, refer to Figure 1 The battery 100 has a width direction, a length direction and a height direction. Assuming that the width direction is the X direction, the length direction is the Y direction, and the height direction is the Z direction, the X direction, the Y direction and the Z direction are perpendicular to each other. It can be understood that the length of the first side surface A is the dimension of the first side surface A along the Y direction, and the width of the second side surface B is the dimension of the second side surface B along the X direction.

[0050] In some embodiments, the transition portion C includes an arc-shaped edge, and the radian of the arc-shaped edge is r, then 0.3≤r×a≤80, unit: rad·mm.

[0051] In some embodiments, the transition portion C is arc-shaped and has stress. When the arc is small, the stress is large, and the distance between the first welding line e1 and the boundary line g needs to be appropriately increased to avoid the problem of cracking of the first welding line e1 due to stress; when the arc is large, the stress is relatively small, and the distance between the first welding line e1 and the boundary line g can be appropriately reduced to further avoid deformation of the shell body 111. Therefore, the value of r×a should be moderate, for example, it can be 0.3, 50, 80, unit: rad·mm.

[0052] In some embodiments, the hardness of the shell body 111 is b, then 0.01≤a / b≤0.83, unit: mm / HRB.

[0053] In the above embodiment, when the hardness of the shell body 111 is relatively high, the distance between the first welding line e1 and the intersection line g can be relatively large; on the contrary, when the hardness of the shell body 111 is relatively low, the first welding line e1 should be as close to the intersection line g as possible. Therefore, the value of a / b should be moderate, for example, a / b can be 0.01, 0.5, or 0.83.

[0054] In some embodiments, the housing body 111 is made of steel, then 0.01≤a / b≤0.8, unit: mm / HRB.

[0055] In the above embodiment, the hardness of the steel is relatively high, so the first welding line e1 can be relatively close to the boundary line g, and a / b can be 0.01, 0.1, or 0.8, unit: mm / HRB.

[0056] It is understandable that the present invention does not impose strict restrictions on the type of steel, and the steel may be carbon steel, alloy steel, or other iron-based stainless steel.

[0057] In some embodiments, the first welding line e1 has a width of d, and 0.004≤d / a≤2.

[0058] In the above embodiment, the transition part C is located at the edge of the battery 100, and the stress is relatively large. The stress may cause cracks at the weld. The wider the first welding line e1 is, the higher the welding strength is, and the closer it can be to the boundary line g; on the contrary, if the first welding line e1 is narrow, the farther it should be from the boundary line g. Therefore, the value of d / a should be moderate, for example, d / a can be 0.004, 0.1, or 2.

[0059] In some embodiments, the width d of the first welding line e1 is in the range of 0.2 mm≤d≤2 mm, where d can be 0.2 mm, 1 mm, or 2 mm.

[0060] In a second aspect, the present application proposes a battery 100 , which includes the battery housing 110 of the first aspect, at least one battery cell 130 disposed inside the battery housing 110 , and a cover plate 120 that blocks an opening D on the battery housing 110 .

[0061] Reference Figure 1 and Figure 2 The shell body 111 has an opening portion D, and the cover plate 120 is sealed and covered on the opening portion D.

[0062] In the above embodiment, the battery 100 proposed in the second aspect includes the battery housing 110 of the first aspect, and therefore, it has at least all the technical effects of the battery housing 110 of the first aspect, and the specific technical effects of the battery housing 110 are not repeated here.

[0063] In addition, the embodiments of the present application only illustrate the structure of the battery 100 related to the improvement points of the present application, and do not mean that it does not have other structures. For example, the battery 100 also includes a charge and discharge protection device, and / or a heat dissipation structure, etc. Other structures will not be described one by one here.

[0064] In some embodiments, the cover plate 120 and the battery housing 110 are welded and connected to form a second welding line e2. It can be understood that referring to Figure 2 The second welding wire e2 is a ring-shaped welding wire distributed around the opening D.

[0065] In some embodiments, the penetration depth of the second welding line e2 is S, and the width of the first welding line e1 is d, 0.01 mm. 2 ≤S×d≤1.8mm 2 .

[0066] In some embodiments, when the cover plate 120 and the battery housing 110 are welded, at the location of the first welding line e1, the second welding line e2 of the cover plate 120 will overlap with the first welding line e1. If the penetration of the second welding line e2 is too deep, the two welding lines will overlap, and it is easy to concentrate heat when the second welding line e2 is welded, and the risk of the second welding line e2 being welded through is high. Therefore, the value of S×d should be moderate, for example, S×d can be 0.01mm 2 , 1mm 2 , 1.8mm 2 .

[0067] In some embodiments, reference Figure 2 In the height direction of the battery 100, that is, along the Z direction, the second welding line e2 and the first welding line e1 do not overlap, and the second welding line e2 is located above the first welding line e1, and the distance between the top end of the first welding line e1 and the cover plate 120 is N, 0mm<N≤0.9mm.

[0068] In some embodiments, the top of the first welding wire e1 is at a certain distance from the second welding wire e2. When the cover plate 120 is welded, the second welding wire e2 can be welded within this distance, thereby avoiding the situation where the two welding wires overlap and weld through. Therefore, the distance N between the top of the first welding wire e1 and the cover plate 120 cannot be too small, but also cannot be too large, otherwise the two welding wires will be difficult to butt together to achieve a sealing effect. Therefore, the distance between the top of the first welding wire e1 and the cover plate 120 should be moderate, for example, N can be 0.1mm, 0.5mm, 0.9mm.

[0069] It should be noted that, refer to Figure 1 and Figure 3 In some embodiments, the top of the first welding wire e1 can directly extend to the top of the shell body 111; in addition, in some embodiments, refer to Figure 2 The top of the first welding wire e1 may also be at a certain distance from the top of the shell body 111, that is, the top of the first welding wire e1 is at a distance N from the cover plate 120, but since the second welding wire e2 has a certain width, after the second welding wire e2 is completed, the top of the first welding wire e1 will be connected to the second welding wire e2 to achieve sealing; in particular, the above two embodiments are within the protection scope of the present application.

[0070] In some embodiments, the first welding line e1 is on the second side surface B, and the battery cell 130 is a laminated battery cell, and the total width of the battery cell 130 is W1, 13.8 mm. 2 ≤W1×a≤3990mm 2 .

[0071] In some embodiments, when the battery cell 130 is a laminated battery cell, the side of the battery cell 130 is relatively flat and the gas generation is relatively uniform. When the width of the battery cell 130 is relatively wide, the gas generation is relatively large, and the expansion force on the shell body 111 is large. In order to prevent the expansion of the shell body 111 from affecting the first welding line e1, the distance between the first welding line e1 and the boundary line g should be reduced to enhance the strength of the first welding line e1. Therefore, the value of W1×a should be moderate, for example, W1×a can be 13.8mm 2 , 1000mm 2 、3990mm 2 .

[0072] It should be noted that the width of the battery cell 130 is its dimension along the X direction. When a plurality of battery cells 130 are accommodated in the battery housing 110 , W1 is the cumulative dimension of all battery cells 130 along the X direction, that is, the total width.

[0073] In some embodiments, the first welding wire e1 is on the second side surface B, and the battery cell 130 is a wound battery cell. The portion of the battery cell 130 corresponding to the second side surface B has a second center line f2, the second center line f2 is perpendicular to the opening D, and the second center line f2 and the first welding wire e1 are spaced apart in the width direction of the battery 100.

[0074] In some embodiments, the wound battery cell is formed by winding a positive electrode sheet, a separator, and a negative electrode sheet. An arc portion is formed at the position of the battery cell 130 corresponding to the second side surface B. The arc portion has a second center line f2 perpendicular to the opening D. The first welding wire e1 is spaced apart from the second center line f2 to prevent the protruding arc portion from squeezing the first welding wire e1 when the battery cell 130 expands.

[0075] In some embodiments, the distance between the second center line f2 and the first welding line e1 in the width direction of the battery 100 is D1, and 0.5 mm≤D1≤40 mm.

[0076] In some embodiments, if the distance between the second center line f2 and the first welding line e1 is too close, the convex arc portion will squeeze the first welding line e1 when the battery cell 130 expands; if the distance between the two is too far, it means that the first welding line e1 is too close to the boundary line g, and the stress concentration phenomenon of the transition portion C will affect the first welding line e1. Therefore, the distance D1 between the second center line f2 and the first welding line e1 should be moderate, for example, D1 can be 0.5mm, 20mm, 40mm.

[0077] It should be noted that when the battery housing 110 contains a plurality of battery cells 130, D1 refers to the distance between the first center line f1 on the battery cell 130 closest to the first welding line e1 and the first welding line e1 along the X direction. Figure 3 , Figure 3 Two wound cells are shown.

[0078] In particular, the term "and / or" in the present invention should be understood as follows:

[0079] In the first case, the term "and / or" located between a first subject and a second subject includes any one of the following meanings: (1) only the first subject; (2) only the second subject; and (3) the first subject and the second subject.

[0080] In the second case, the term "and / or" between the last two subjects among three or more subjects means including at least any one of the multiple subjects. For example, "the first subject, the second subject and / or the third subject" has the same meaning as "the first subject and / or the second subject and / or the third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) the first subject and the second subject but not the third subject; (5) the first subject and the third subject but not the second subject; (6) the second subject and the third subject but not the first subject; and (7) the first subject, the second subject and the third subject.

[0081] In addition, although the above content describes the embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art can also make various modifications and variations without departing from the concept of the present invention, and such modifications and variations all fall within the scope of protection of the present invention.

Claims

1. A battery housing, characterized in that: The invention comprises a shell body (111) formed in a surrounding manner, wherein the shell body (111) comprises at least two first side surfaces (A) arranged opposite to each other and at least two second side surfaces (B) arranged opposite to each other, wherein the area of ​​the first side surface (A) is greater than the area of ​​the second side surface (B); the first side surface (A) and the second side surface (B) surround and form a receiving cavity, and form two upper and lower openings (D); the first side surface (A) or the second side surface (B) forms an interface end, and the interface end is welded and connected to form a first welding wire (e1); The adjacent first side surface (A) and the second side surface (B) are connected by a transition portion (C); the surface where the first welding line (e1) is located has a first center line (f1); the first center line (f1) is perpendicular to the opening portion (D); the first welding line (e1) deviates from the first center line (f1); a boundary line (g) is formed between the surface where the first welding line (e1) is located and the transition portion (C); the distance between the first welding line (e1) and the nearest boundary line (g) is a, 1mm≤a<50mm; The transition portion (C) is located in the edge corner region of the shell body (111), and the transition portion (C) comprises an arc-shaped edge, the radian of the arc-shaped edge is r, then 0.3≤r×a≤80, unit: rad·mm.

2. The battery housing according to claim 1, characterized in that: The first welding line (e1) is on the first side surface (A), 1mm≤a≤48mm.

3. The battery housing according to claim 2, characterized in that: The ratio of the length L of the first side surface (A) to a is 2≤L / a≤100.

4. The battery housing according to claim 1, characterized in that: The first welding line (e1) is on the second side surface (B), 1.5 mm≤a≤50 mm.

5. The battery casing according to claim 4, characterized in that: A ratio of a width W of the second side surface (B) to a is 1≤W / a≤80.

6. The battery case according to claim 1, characterized in that: The hardness of the shell body (111) is b, then 0.01≤a / b≤0.83, unit: mm / HRB.

7. The battery casing according to claim 2, characterized in that: The shell body (111) is made of steel, then 0.01≤a / b≤0.8, unit: mm / HRB.

8. The battery casing according to claim 1, characterized in that: The width of the first welding line (e1) is d, then 0.004≤d / a≤2.

9. The battery casing according to claim 8, characterized in that: The range of the width d of the first welding line (e1) is: 0.2 mm≤d≤2 mm.

10. A battery, characterized in that: The battery case (110) comprises the battery case (110) according to any one of claims 1 to 9, at least one battery cell (130) arranged inside the battery case (110), and a cover plate (120) for sealing an opening (D) on the battery case (110).

11. The battery according to claim 10, characterized in that The cover plate (120) and the battery housing (110) are connected by welding to form a second welding line (e2).

12. The battery according to claim 11, characterized in that The penetration depth of the second welding line (e2) is S, and the width of the first welding line (e1) is d, 0.01 mm 2 ≤S×d≤1.8mm 2 .

13. The battery according to claim 12, characterized in that In the height direction of the battery (100), the second welding line (e2) and the first welding line (e1) do not overlap, and the second welding line (e2) is located above the first welding line (e1), and the distance between the top end of the first welding line (e1) and the cover plate (120) is N, 0mm<N≤0.9mm.

14. The battery according to claim 10, characterized in that The first welding line (e1) is on the second side surface (B), and the battery cell (130) is a laminated battery cell, and the total width of the battery cell (130) is W1, 13.8 mm 2 ≤W1×a≤3990mm 2 .

15. The battery according to claim 10, characterized in that The first welding wire (e1) is on the second side surface (B), and the battery cell (130) is a wound battery cell. The portion of the battery cell (130) corresponding to the second side surface (B) has a second center line (f2), the second center line (f2) is perpendicular to the opening (D), and the second center line (f2) and the first welding wire (e1) are spaced apart in a width direction of the battery (100).

16. The battery according to claim 15, characterized in that The distance between the second center line (f2) and the first welding line (e1) in the width direction of the battery (100) is D1, and 0.5 mm≤D1≤40 mm.

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