Battery, battery pack and electric equipment

Abstract

The utility model provides a battery, a battery pack and electric equipment. The battery comprises a battery shell, an electrode assembly and a cover plate assembly, an inner cavity is formed in the battery shell; the electrode assembly is arranged in the inner cavity and comprises a first pole piece and a second pole piece, and the polarity of the first pole piece is opposite to that of the second pole piece; the cover plate assembly covers the battery shell to seal the inner cavity, the cover plate assembly comprises a pole assembly and a cover plate body, and the pole assembly is mounted on the cover plate body; wherein the cover plate body is provided with a recess to form a recess part, the recess part is electrically connected to the first pole piece, and the pole assembly is electrically connected to the second pole piece. The utility model aims to solve the technical problem that the upper cover plate of the battery is easy to deform due to stress and is separated from the negative pole piece.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery, a battery pack and an electrical device. Background Art

[0002] In related technologies, in order to achieve the output of the positive and negative poles of the battery on the same side of the battery, the battery cover is often used as one output pole, and the battery pole passes through the battery cover as the other output pole (an insulating member is provided between the battery pole and the battery cover). The battery cover is electrically connected to the pole piece. When the internal air pressure of the battery changes, the battery cover is easily deformed by force and separated from the pole piece. Utility Model Content

[0003] The embodiments of the present utility model provide a battery, a battery pack and an electrical device, aiming to solve the technical problem that the upper cover of the battery is easily deformed by force and separated from the negative electrode sheet.

[0004] In a first aspect, an embodiment of the present invention provides a battery, comprising:

[0005] a battery housing forming an inner cavity;

[0006] an electrode assembly disposed in the inner cavity, the electrode assembly comprising a first electrode piece and a second electrode piece, wherein the first electrode piece and the second electrode piece have opposite polarities; and

[0007] a cover plate assembly, which is disposed on the battery housing to seal the inner cavity, the cover plate assembly comprising a pole assembly and a cover plate body, the pole assembly being mounted on the cover plate body;

[0008] The cover plate body is provided with a recess to form a recessed portion, the recessed portion is electrically connected to the first pole piece, and the pole assembly is electrically connected to the second pole piece.

[0009] In one embodiment, the recessed portion is provided with a welding plate for welding connection, the welding plate is electrically connected to the first pole piece, and the thickness of the welding plate is smaller than the thickness of the region of the cover body where the recessed portion is not provided.

[0010] In one embodiment, the electrode assembly includes a first current collecting member and a second current collecting member, the first current collecting member and the second current collecting member are located at the same end of the electrode assembly, the first current collecting member is welded to the first pole piece and the welding plate, and the second current collecting member is electrically connected to the second pole piece and the pole assembly.

[0011] In one embodiment, the thickness of the welding plate is H1, the thickness of the first current collecting member is H2, H2=bH1, b is a first coefficient, 0.5≤b≤1.2.

[0012] In one embodiment, the thickness of the welding plate is H1, and the thickness of the region of the cover body where the recessed portion is not provided is H3, H1=aH3, a is a second coefficient, 0.5≤a≤0.7.

[0013] In one embodiment, the recessed portion includes a bottom plate forming the bottom of the recess, and the welding plate is provided on the bottom plate.

[0014] In one embodiment, the recessed portion further includes a side plate connected to the bottom plate to form the recess together with the bottom plate, the bottom plate is electrically connected to the first pole piece, the bottom plate is provided with a welding plate for welding connection, the thickness of the welding plate is H1, and the thickness of the side plate is H4, wherein cH4=H1, c is the third coefficient, 0.3≤c≤0.6.

[0015] In one embodiment, the recessed portion includes a first bent connection portion and a second bent connection portion, wherein the first bent connection portion is connected between the side plate and the bottom plate, and the second bent connection portion is connected between the side plate and an area of ​​the cover plate body where the recessed portion is not provided.

[0016] The thickness of the area of ​​the cover body where the recessed portion is not provided is H3, the curvature radius of the first bending connection portion is R1, and the curvature radius of the second bending connection portion is R2, wherein R1=mH3, R2=nH3, m is the seventh coefficient, n is the eighth coefficient, 0.8≤m≤2, 0.1≤n≤1.

[0017] In one embodiment, R1=pR2, p is the ninth coefficient, and 0.15≤p≤0.5.

[0018] In one embodiment, the recessed portion includes a first bent connection portion, which is connected between the side plate and the bottom plate. The thickness of the first bent connection portion gradually decreases along the direction from the side plate to the bottom plate.

[0019] In one embodiment, the thickness of the area of ​​the cover body where the recessed portion is not provided is H3, the width of the recessed portion is L1, and the depth of the recessed portion is L2, wherein L1=dH3, L2=eH3, d is the fourth coefficient, 2.5≤d≤5, and e is the fifth coefficient, 1.5≤e≤3.5.

[0020] In one embodiment, the recessed portion protrudes toward the inner cavity.

[0021] In one embodiment, the diameter of the circle where the outer contour of the orthographic projection of the battery housing on the horizontal plane lies is D1, and the diameter of the circle where the center line of the orthographic projection of the recessed portion on the horizontal plane lies is D2, where D2=fD1, f is the sixth coefficient, 0.5≤f≤0.8.

[0022] In one embodiment, the cross-sectional shape of the recessed portion includes any one of a U-shape, a V-shape, and a W-shape.

[0023] In one embodiment, the cover plate assembly further includes a first insulating member, and the first insulating member is disposed between the first current collecting member and the second current collecting member.

[0024] In a second aspect, an embodiment of the present invention provides a battery pack comprising a plurality of the above-mentioned batteries.

[0025] In a third aspect, an embodiment of the present invention provides an electrical device including the above-mentioned battery pack.

[0026] Beneficial effects of the embodiments of the present utility model:

[0027] In the technical solution of this utility model, a recessed portion is formed on the cover body, and the recessed portion is electrically connected to the first pole piece, thereby connecting the cover body to the electrode assembly, making the cover body serve as one output pole, and the pole assembly is electrically connected to the second pole piece, making the pole assembly serve as another output pole. The recessed portion can disperse the pressure applied to the cover body, improve the cover body's ability to resist deformation, and prevent the cover body from being deformed by force, resulting in the cover body and the first pole piece being separated. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 This is a structural diagram of an embodiment of a battery provided by the present utility model;

[0030] Figure 2 yes Figure 1 A partial cross-sectional view of the middle battery;

[0031] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle cover assembly and the electrode assembly;

[0032] Figure 4 yes Figure 1 A is an enlarged schematic diagram;

[0033] Figure 5 yes Figure 1 A magnified schematic diagram of middle B;

[0034] Figure 6 yes Figure 1 Front view of the battery.

[0035] Explanation of Figure Numbers

[0036] Label name Label name 100 Battery 110 The first current collecting piece 101 battery housing 111 Second current collecting piece 102 Lumen 112 baseplate 103 Electrode assembly 113 Side panels 104 First pole piece 114 First cover part 105 Second pole piece 115 Second cover part 106 Cover assembly 116 Welding plate 107 Pole assembly 117 First insulating member 108 Cover body 118 First bending connection portion 109 Depression 119 Second bending connection portion DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0038] In related technologies, in order to achieve the output of the positive and negative poles of the battery on the same side of the battery, the battery cover is often used as one output pole, and the battery pole passes through the battery cover as the other output pole (an insulating member is provided between the battery pole and the battery cover). The battery cover is electrically connected to the pole piece. When the internal air pressure of the battery changes, the battery cover is easily deformed by force and separated from the pole piece.

[0039] In view of this, the utility model proposes a battery, Figures 1 to 6 This is a structural schematic diagram of an embodiment of a battery provided by the present invention; the battery will be described in detail below in conjunction with the main drawings.

[0040] See also Figure 1 and Figure 2The battery 100 includes a battery housing 101, an electrode assembly 103, and a cover assembly 106. The battery housing 101 is formed with an inner cavity 102; the electrode assembly 103 is disposed in the inner cavity 102, and the electrode assembly 103 includes a first electrode sheet 104 and a second electrode sheet 105, wherein the first electrode sheet 104 and the second electrode sheet 105 have opposite polarities; the cover assembly 106 is disposed on the battery housing 101 to seal the inner cavity 102, and the cover assembly 106 includes a pole assembly 107 and a cover body 108, wherein the pole assembly 107 is mounted on the cover body 108. The cover body 108 is provided with a recess to form a recessed portion 109, wherein the recessed portion 109 is electrically connected to the first electrode sheet 104, and the pole assembly 107 is electrically connected to the second electrode sheet 105.

[0041] In the technical solution of the present utility model, a recessed portion 109 is formed on the cover body 108. The recessed portion 109 is electrically connected to the first pole piece 104, thereby connecting the cover body 108 to the electrode assembly 103, making the cover body 108 an output pole of one polarity, and the pole assembly 107 electrically connected to the second pole piece 105, making the pole assembly an output pole of the other polarity. At the same time, the recessed portion 109 can disperse the pressure applied to the cover body 108, improving the cover body 108's resistance to deformation, preventing the cover body 108 from being deformed by force, resulting in the cover body 108 and separating from the first pole piece 104, thereby increasing the service life of the battery 100.

[0042] It should be noted that the polarity of the first electrode 104 and the second electrode 105 are opposite, that is, one of the first electrode 104 and the second electrode 105 is a positive electrode, and the other is a negative electrode. In this embodiment, the first electrode 104 is a negative electrode and the second electrode 105 is a positive electrode. Therefore, the cover body 108 serves as the negative output terminal, and the electrode assembly 107 serves as the positive output terminal.

[0043] Specifically, in this embodiment, please refer to Figure 2 and Figure 3 The recessed portion 109 is provided with a welding plate 116 for welding connection. The welding plate 116 is electrically connected to the first electrode 104. More specifically, considering the difficulty of welding, the thickness of the welding plate 116 is smaller than the thickness of the region of the cover plate body 108 where the recessed portion 109 is not provided. This configuration reduces the thickness of the welding plate 116, allowing welding energy to more easily penetrate the welding plate 116 during the welding process, thereby reducing the difficulty of welding.

[0044] It should be noted that the connection method between the recessed portion 109 and the first pole piece 104 is not limited, and the connection method between the pole assembly 107 and the second pole piece 105 is not limited; for example, in one embodiment, in order to shorten the current collecting path, the recessed portion 109 is connected to the first pole piece 104, and the pole assembly 107 is connected to the second pole piece 105. In another embodiment, please refer to Figure 4 To ensure connection strength and improve the stability of the battery 100, the electrode assembly 103 includes a first current collector 110. The first current collector 110 is disposed between the first electrode sheet 104 and the welding plate 116, and is welded to the first electrode sheet 104 and the welding plate 116. Furthermore, during the actual connection process, the first current collector 110 is first welded to the first electrode sheet 104, and then the cover body 108 is placed on the battery housing 101. The recessed portion 109 corresponds to the first current collector 110, and is then welded to the first current collector 110 via the welding plate 116. This arrangement ensures connection strength and improves the stability of the battery 100.

[0045] Further, see Figure 5 The electrode assembly 103 further includes a second current collector 111, which is disposed between the second electrode piece 105 and the electrode post assembly 107. The second current collector 111 is electrically connected to the second electrode piece 105 and the electrode post assembly 107. Furthermore, to ensure connection strength, the second current collector 111 is welded to the second electrode piece 105, and the second current collector 111 is welded to the electrode post assembly 107.

[0046] Furthermore, in this embodiment, the first current collector 110 and the second current collector 111 are located at the same end of the electrode assembly 103. The positive and negative electrodes of the battery 100 are located on the same side, and current is collected from one side of the battery 100, thereby improving the current collection capacity of the battery 100.

[0047] Further, see Figure 4, the thickness of the welding plate 116 is H1, and the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is H3, H1=aH3, a is the second coefficient, 0.5≤a≤0.7. It should be noted that when a is less than 0.5, the thickness of the welding plate 116 is relatively thin, and the cover body 108 is easily broken at the recessed portion 109. When a is greater than 0.7, the thickness of the welding plate 116 is relatively thick, and the difficulty of welding increases. In this embodiment, the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 0.4~1mm. According to the above relationship, it can be inferred that the thickness of the welding plate 116 is 0.2~0.7mm.

[0048] Specifically, in some embodiments, the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided may be 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, 0.85 mm, 0.9 mm, 0.95 mm, or 1 mm.

[0049] In some embodiments, the thickness of the welding plate 116 is 0.5H3, 0.52H3, 0.54H3, 0.55H3, 0.56H3, 0.58H3, 0.6H3, 0.62H3, 0.64H3, 0.65H3, 0.66H3, 0.68H3, or 0.7H3. Specifically, when the thickness of the region of the cover body 108 where the recessed portion 109 is not provided is 0.4 mm, the thickness of the welding plate 116 may be 0.2 mm, 0.208 mm, 0.216 mm, 0.22 mm, 0.224 mm, 0.232 mm, 0.24 mm, 0.248 mm, 0.256 mm, 0.26 mm, 0.264 mm, 0.272 mm, or 0.28 mm. When the thickness of the region of the cover body 108 where the recessed portion 109 is not provided is 0.6 mm, the thickness of the welding plate 116 is 0.3 mm, 0.312 mm, 0.324 mm, 0.33 mm, 0.336 mm, 0.348 mm, 0.36 mm, 0.372 mm, 0.384 mm, 0.39 mm, 0.396 mm, 0.408 mm, or 0.42 mm. When the thickness of the region of the cover body 108 where the recessed portion 109 is not provided is 1 mm, the thickness of the welding plate 116 is 0.5 mm, 0.52 mm, 0.54 mm, 0.55 mm, 0.56 mm, 0.58 mm, 0.6 mm, 0.62 mm, 0.64 mm, 0.65 mm, 0.66 mm, 0.68 mm, or 0.7 mm.

[0050] In some embodiments, see Figure 4The thickness of the welding plate 116 is H1, and the thickness of the first current collecting member 110 is H2. H2 = bH1, where b is a first coefficient and 0.5 ≤ b ≤ 1.2. Specifically, if the welding plate 116 is too thick, welding becomes more difficult. If the welding plate 116 is too thin, the cover body 108 will be weak and easily deformed under stress. If the first current collecting member 110 is too thin, it will be weak and prone to breakage during use. If the first current collecting member 110 is thicker, the resistance will increase and the space occupied by the first current collecting member 110 will also increase. The welding plate 116 is welded to the first current collecting member 110. It should be noted that when b is less than 0.5, the thickness of the first current collecting member 110 and the welding plate 116 is too small, resulting in reduced strength and prone to breakage during use. When b is greater than 1.2, the thickness of the first current collecting member 110 and the welding plate 116 is too thick, increasing the resistance, the space occupied, and the welding difficulty. More specifically, in this embodiment, the thickness of the welding plate 116 is 0.2-0.7 mm.

[0051] In some embodiments, the thickness of the first current collecting member 110 is 0.5H1, 0.6H1, 0.7H1, 0.8H1, 0.9H1, 1.0H1, or 1.1H1. When the thickness of the welding plate 116 is 0.2 mm, the thickness of the first current collecting member 110 may be 0.1 mm, 0.12 mm, 0.14 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.22 mm, or 0.24 mm. When the thickness of the welding plate 116 is 0.5 mm, the thickness of the first current collecting member 110 may be 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, or 0.6 mm. When the thickness of the welding plate 116 is 0.7 mm, the thickness of the first current collecting member 110 may be 0.35 mm, 0.42 mm, 0.49 mm, 0.56 mm, 0.63 mm, 0.7 mm, 0.77 mm, or 0.84 mm.

[0052] It should be noted that the formation method of the recessed portion 109 is not limited. In this embodiment, the recessed portion 109 includes a groove. Specifically, the cover plate body 108 is placed on a stamping machine, and the groove is punched out on the cover plate body 108 by stamping. During the stamping process, due to the effect of the stamping pressure, the thickness of the bottom of the groove (that is, the bottom plate 112) is less than the original thickness of the cover plate body 108. It should be noted that the groove includes a bottom plate 112 and a side plate 113, and the welding plate 116 can be the bottom plate 112 or the side plate 113, and can be selected according to actual conditions. Taking into account the difficulty of welding and the stability of the structure, the welding plate 116 is preferably the bottom plate 112.

[0053] For further information, please see Figure 5 The recessed portion 109 also includes a side plate 113 connected to the bottom plate 112 to form the recess together with the bottom plate 112. The bottom plate 112 is electrically connected to the first pole piece 104. The bottom plate 112 is provided with a welding plate 116 for welding connection. It should be noted that the welding plate 116 can be the entire bottom plate 112, that is, the entire bottom plate 112 is welded to the first current collecting member 110, and the welding portion can be a partial area in the bottom plate 112, that is, part of the bottom plate 112 is welded to the first current collecting member 110.

[0054] In some embodiments, the thickness of the welding plate 116 is H1, and the thickness of the side panel 113 is H4, wherein cH4=H1, c is the third coefficient, and 0.3≤c≤0.6. It should be noted that when c is less than 0.3, the thickness of the side panel 113 is relatively thin and is prone to breakage during use. When c is greater than 0.6, the thickness of the side panel 113 increases and the space occupied increases. When the thickness of the welding plate 116 is 0.2mm, the thickness of the side panel 113 is 0.67mm, 0.571mm, 0.5mm, 0.44mm, 0.4mm, 0.364mm, and 0.34mm. When the thickness of the welding plate 116 is 0.5mm, the thickness of the side panel 113 can be 1.67mm, 1.43mm, 1.25mm, 1.11mm, 1mm, 0.91mm, and 0.84mm. When the thickness of the welding plate 116 is 0.7 mm, the thickness of the side plate 113 can be 2.34 mm, 2 mm, 1.75 mm, 1.56 mm, 1.4 mm, 1.273 mm, or 1.167 mm.

[0055] See also Figure 5The recessed portion 109 includes a first bending connection portion 118 and a second bending connection portion 119. The first bending connection portion 118 is connected between the side plate 113 and the bottom plate 112, and the second bending connection portion 119 is connected between the side plate 113 and the area of ​​the cover plate body 108 where the recessed portion 109 is not provided. It should be noted that, in the above embodiment, H1 refers to the size of the welding plate 116 at a uniform thickness, excluding the size of the bend. Similarly, H4 also refers to the size of the side plate 113 at a uniform thickness, excluding the size of the bend. It should be noted that the purpose of providing the first bending connection portion 118 and the second bending connection portion 119 is to disperse the force acting on the recessed portion 109, avoid force concentration, and improve the deformation resistance of the cover plate body 108.

[0056] Further, see Figure 4 and Figure 5The thickness of the cover body 108 in the area without the recessed portion 109 is H3, and the radius of curvature of the first bent connection portion 118 is R1, where R1 = mH3, where m is the seventh coefficient 0.8≤m≤2. It should be noted that when m is less than 0.8, the radius of curvature of the first bent portion is too small to achieve the effect of dispersing the applied force. When m is greater than 2, the radius of curvature of the first bent connection portion 118 is too large, resulting in an increase in the overall size of the cover body 108 and an increase in the space occupied. Specifically, the curvature radius of the first bending connection portion 118 can be 0.8H3, 0.82H3, 0.84H3, 0.85H3, 0.88H3, 0.9H3, 0.92H3, 0.94H3, 0.95H3, 0.96H3, 1H3, 1.2H3, 1.4H3, 1.5H3, 1.6H3, 1.8H3, or 2H3. When the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 0.4 mm, the curvature radius of the first bending connection portion 118 is 0.32 mm, 0.328 mm, 0.336 mm, 0.34 mm, 0.352 mm, 0.36 mm, 0.368 mm, 0.376 mm, 0.38 mm, 0.384 mm, 0.4 mm, 0.48 mm, 0.56 mm, 0.6 mm, 0.64 mm, 0.72 mm, and 0.8 mm. When the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 0.6 mm, the curvature radius of the first bending connection portion 118 is 0.48 mm, 0.492 mm, 0.504 mm, 0.51 mm, 0.528 mm, 0.54 mm, 0.552 mm, 0.564 mm, 0.57 mm, 0.576 mm, 0.588 mm, 0.6 mm, 0.66 mm, 0.72 mm, 0.84 mm, 0.9 mm, 0.96 mm, 1.08 mm, and 1.2 mm. When the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 1 mm, the curvature radius of the first bending connection portion 118 is 0.8 mm, 0.82 mm, 0.84 mm, 0.85 mm, 0.88 mm, 0.9 mm, 0.92 mm, 0.94 mm, 0.95 mm, 0.96 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.8 mm, and 2 mm.

[0057] See also Figure 4 and Figure 5The curvature radius of the second bent connection portion 119 is R2, where R2=nH3, n is the eighth coefficient, and 0.1≤n≤1. Specifically, the curvature radius of the second bent connection portion 119 is 0.1H3, 0.2H3, 0.3H3, 0.4H3, 0.5H3, 0.6H3, 0.7H3, 0.8H3, 0.9H3, and 1H3. When the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 0.4mm, the curvature radius of the second bent connection portion 119 is 0.04mm, 0.08mm, 0.12mm, 0.16mm, 0.2mm, 0.24mm, 0.28mm, 0.32mm, 0.36mm, and 0.4mm. When the thickness of the region of the cover body 108 without the recessed portion 109 is 0.6 mm, the curvature radius of the second bent connection portion 119 is 0.06 mm, 0.12 mm, 0.18 mm, 0.24 mm, 0.3 mm, 0.36 mm, 0.42 mm, 0.48 mm, 0.56 mm, or 0.6 mm. When the thickness of the region of the cover body 108 without the recessed portion 109 is 1 mm, the curvature radius of the second bent connection portion 119 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm.

[0058] Furthermore, in some embodiments, R1=pR2, where p is the ninth coefficient and 0.15≤p≤0.5. Specifically, for example, when the thickness of the region of the cover body 108 where the recessed portion 109 is not provided is 0.4 mm, the radius of curvature of the first bent connection portion 118 is 0.32 mm, and the radius of curvature of the second bent connection portion 119 is 0.16 mm, p is 0.5, which meets the requirements of the above formula.

[0059] In some embodiments, the thickness of the first bent connection portion 118 gradually decreases from the side panel 113 to the bottom panel 112. This configuration makes the connection between the side panel 113 and the area of ​​the cover body 108 where the recessed portion 109 is not provided smoother.

[0060] In some embodiments, see Figure 4, the width of the recessed portion 109 is L1, where L1=dH3, d is the fourth coefficient, and 2.5≤d≤5. It should be noted that the width of the recessed portion 109 here refers to the distance between the two side plates 113 in the cross-section of the recessed portion 109 (that is, the size excluding the bend). When d is less than 2.5, the overall width of the recessed portion 109 is too small, the width of the welding plate 116 is correspondingly reduced, the welding area between the welding plate 116 and the first current collecting member 110 is reduced, and the welding strength is reduced. When d is greater than 5, the overall width of the recessed portion 109 increases and the space occupied increases. Specifically, the width of the recessed portion 109 can be 2.5H3, 2.6H3, 2.8H3, 3H3, 3.2H3, 3.5H3, 3.8H3, 4H3, 4.2H3, 4.5H3, 4.8H3, 5H3. When the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 0.4 mm, the width of the recessed portion 109 may be 1 mm, 1.04 mm, 1.12 mm, 1.2 mm, 1.28 mm, 1.4 mm, 1.52 mm, 1.6 mm, 1.68 mm, 1.8 mm, 1.92 mm, or 2 mm. When the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 0.6 mm, the width of the recessed portion 109 may be 1.5 mm, 1.56 mm, 1.68 mm, 1.8 mm, 1.92 mm, 2.1 mm, 2.28 mm, 2.4 mm, 2.52 mm, 2.7 mm, 2.88 mm, or 3 mm. When the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 1 mm, the width of the recessed portion 109 may be 2.5 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.8 mm, 4 mm, 4.2 mm, 4.5 mm, 4.8 mm, or 5 mm.

[0061] In some embodiments, see Figure 4, the depth of the recessed portion 109 is L2, where L2=eH3, e is the fifth coefficient, and 1.5≤e≤3.5. It should be noted that when e is less than 1.5, the depth of the recessed portion 109 is too shallow and the deformation resistance is weak. When the internal air pressure of the battery 100 increases, the cover body 108 is easily separated from the first current collecting member 110. When e is greater than 3.5, the depth of the recessed portion 109 is too deep, resulting in an increase in the overall size of the battery 100 and an increase in occupied space. Specifically, the depth of the recessed portion 109 can be 1.5H3, 1.8H3, 2H3, 2.2H3, 2.5H3, 2.8H3, 3H3, 3.1H3, 3.2H3, and 3.5H3. When the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 0.4 mm, the depth of the recessed portion 109 may be 0.6 mm, 0.72 mm, 0.8 mm, 0.88 mm, 1 mm, 1.12 mm, 1.2 mm, 1.24 mm, 1.28 mm, or 1.4 mm. When the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 0.6 mm, the depth of the recessed portion 109 may be 0.9 mm, 1.08 mm, 1.2 mm, 1.32 mm, 1.5 mm, 1.68 mm, 1.8 mm, 1.86 mm, 1.92 mm, or 2.1 mm. When the thickness of the area of ​​the cover body 108 where the recessed portion 109 is not provided is 1 mm, the depth of the recessed portion 109 may be 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.1 mm, 3.2 mm, or 3.5 mm.

[0062] See also Figure 3 In order to facilitate welding of the welding plate 116 and the first current collecting member 110, the recessed portion 109 protrudes toward the inner cavity 102, and at the same time can shorten the distance between the cover body 108 and the electrode assembly 103, further preventing the first electrode 104 from being separated from the cover body 108.

[0063] In some embodiments, see Figure 3 and Figure 6The diameter of the circle containing the outer contour of the orthographic projection of the battery housing 101 on a horizontal plane is D1, and the diameter of the circle containing the centerline of the orthographic projection of the recessed portion 109 on a horizontal plane is D2, where D2 = fD1, f is the sixth coefficient, and 0.5≤f≤0.8. It should be noted that when f is less than 0.5, the position of the recessed portion 109 is close to the terminal assembly 107 (i.e., the overall position is biased inward), resulting in a corresponding reduction in the volume of the second current collector 111 and a decrease in the current collecting capacity of the battery 100. When f is greater than 0.8, the position of the recessed portion 109 is close to the side wall of the battery housing 101 (i.e., the overall position is biased outward). Due to the welded connection between the recessed portion 109 and the first current collector 110, the volume of the first current collector 110 is correspondingly reduced, and the current collecting capacity of the battery 100 is also reduced. Specifically, in this embodiment, the diameter of the circle containing the outer contour of the orthographic projection of the battery housing 101 on a horizontal plane is 24 to 60 mm. The diameter of the circle on which the centerline of the orthographic projection of the recessed portion 109 lies on a horizontal plane is 0.5D1, 0.55D1, 0.6D1, 0.65D1, 0.7D1, 0.75D1, or 0.8D1. When D1 is 24 mm, D2 can be 12 mm, 13.2 mm, 14.4 mm, 15.6 mm, 16.8 mm, 18 mm, or 19.2 mm. When D1 is 40 mm, D2 can be 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, or 32 mm. When D1 is 60 mm, D2 can be 30 mm, 33 mm, 36 mm, 39 mm, 42 mm, 45 mm, or 48 mm.

[0064] It should be noted that the cross-sectional shape of the recessed portion 109 is not limited, as long as it can protrude toward the inner cavity 102 . For example, the cross-sectional shape of the recessed portion 109 can be U-shaped, V-shaped, or W-shaped.

[0065] See also Figure 5 To prevent a short circuit inside the battery 100, the cover assembly 106 further includes a first insulating member 117, which is disposed between the first current collector 110 and the second current collector 111. The first insulating member 117 is used to isolate the first current collector 110 from the second current collector 111 to prevent contact between the two. Furthermore, the first insulating member 117 is disposed below the cover body 108 to support the cover body 108.

[0066] It should be noted that, in some embodiments, the cover plate body 108 includes a first cover plate portion 114 and a second cover plate portion 115, wherein the first cover plate portion 114 is connected to the outer periphery of the second cover plate portion 115, and the first hole is provided in the second cover plate portion 115, and the first hole is configured to allow the terminal assembly 107 to pass through, so that the terminal assembly 107 is connected to the second current collecting member 111. The first cover plate portion 114 is connected to the battery housing 101, and the recessed portion 109 is provided in the first cover plate portion 114.

[0067] The present invention also provides a battery pack comprising a plurality of the above-described batteries 100. The specific structure of the battery 100 is similar to that of the above-described embodiments. Since the present battery 100 utilizes all the technical solutions of all the above-described embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above-described embodiments, and therefore will not be further elaborated here.

[0068] Furthermore, the battery pack also includes a housing having a housing formed therein, wherein a plurality of batteries 100 are spaced apart within the housing. The plurality of batteries 100 can be connected in parallel or in series, depending on the actual situation. It should be noted that the battery pack, by employing the aforementioned batteries 100, has enhanced safety performance and more stable operation.

[0069] In addition, the present invention also provides an electrical device including the aforementioned battery pack. The specific structure of the battery pack is described in the aforementioned embodiments. Since the present electrical device utilizes all the technical solutions of all the aforementioned embodiments, it possesses at least all the beneficial effects of the technical solutions of the aforementioned embodiments, and therefore will not be further elaborated here.

[0070] It is understood that the electric devices include, but are not limited to, electric toys, electric tools, battery-powered vehicles, cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Cars may include gasoline-powered cars, gas-powered cars, and new energy vehicles.

[0071] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery, characterized in that: include: A battery housing (101) is formed with an inner cavity (102); an electrode assembly (103) disposed in the inner cavity (102), the electrode assembly (103) comprising a first pole piece (104) and a second pole piece (105), the first pole piece (104) and the second pole piece (105) having opposite polarities; and a cover plate assembly (106) disposed on the battery housing (101) to seal the inner cavity (102); the cover plate assembly (106) includes a pole assembly (107) and a cover plate body (108); the pole assembly (107) is mounted on the cover plate body (108); The cover plate body (108) is provided with a recess to form a recessed portion (109), the recessed portion (109) is electrically connected to the first pole piece (104), and the pole assembly (107) is electrically connected to the second pole piece (105).

2. The battery according to claim 1, characterized in that The recessed portion (109) is provided with a welding plate for welding connection, the welding plate is electrically connected to the first pole piece (104), and the thickness of the welding plate is smaller than the thickness of the region of the cover plate body (108) where the recessed portion (109) is not provided.

3. The battery according to claim 2, characterized in that The electrode assembly (103) comprises a first current collecting member (110) and a second current collecting member (111), wherein the first current collecting member (110) and the second current collecting member (111) are located at the same end of the electrode assembly (103), the first current collecting member (110) is welded to the first pole piece (104) and the welding plate, and the second current collecting member (111) is electrically connected to the second pole piece (105) and the pole assembly (107).

4. The battery according to claim 3, characterized in that The thickness of the welding plate is H1, the thickness of the first current collecting member (110) is H2, H2=bH1, b is a first coefficient, 0.5≤b≤1.

2.

5. The battery according to claim 2, characterized in that The thickness of the welding plate is H1, and the thickness of the region of the cover plate body (108) where the recessed portion (109) is not provided is H3, H1=aH3, a is a second coefficient, 0.5≤a≤0.

7.

6. The battery according to claim 2 or 3, characterized in that The recessed portion (109) includes a bottom plate (112) forming the bottom of the recess, and the welding plate is arranged on the bottom plate (112).

7. The battery according to claim 6, characterized in that The recessed portion (109) further includes a side plate (113) connected to the bottom plate (112) to enclose the recess together with the bottom plate (112), the bottom plate (112) being electrically connected to the first pole piece (104), the bottom plate (112) being provided with a welding plate for welding connection, the thickness of the welding plate being H1, and the thickness of the side plate (113) being H4, wherein cH4=H1, c is a third coefficient, and 0.3≤c≤0.

6.

8. The battery according to claim 7, characterized in that The recessed portion (109) includes a first bent connection portion (118) and a second bent connection portion (119), wherein the first bent connection portion (118) is connected between the side plate (113) and the bottom plate (112), and the second bent connection portion (119) is connected between the side plate (113) and an area of ​​the cover plate body (108) where the recessed portion (109) is not provided. The thickness of the area of ​​the cover plate body (108) where the recessed portion (109) is not provided is H3, the curvature radius of the first bent connection portion (118) is R1, and the curvature radius of the second bent connection portion (119) is R2, wherein R1=mH3, R2=nH3, m is the seventh coefficient, n is the eighth coefficient, 0.8≤m≤2, 0.1≤n≤1.

9. The battery according to claim 8, characterized in that R1=pR2, p is the ninth coefficient, 0.15≤p≤0.

5.

10. The battery according to claim 7, characterized in that The recessed portion (109) includes a first bent connection portion (118), wherein the first bent connection portion (118) is connected between the side plate (113) and the bottom plate (112), and the thickness of the first bent connection portion (118) gradually decreases in a direction from the side plate (113) to the bottom plate (112).

11. The battery according to any one of claims 1 to 4, characterized in that: The thickness of the area of ​​the cover plate body (108) where the recessed portion (109) is not provided is H3, the width of the recessed portion (109) is L1, and the depth of the recessed portion (109) is L2, wherein L1=dH3, L2=eH3, d is the fourth coefficient, 2.5≤d≤5, and e is the fifth coefficient, 1.5≤e≤3.

5.

12. The battery according to any one of claims 1 to 5, characterized in that: The recessed portion (109) protrudes toward the inner cavity (102).

13. The battery according to any one of claims 1 to 5, characterized in that: The diameter of the circle where the outer contour of the orthographic projection of the battery housing (101) on the horizontal plane lies is D1, and the diameter of the circle where the center line of the orthographic projection of the recessed portion (109) on the horizontal plane lies is D2, wherein D2=fD1, f is the sixth coefficient, 0.5≤f≤0.

8.

14. The battery according to any one of claims 1 to 5, characterized in that: The cross-sectional shape of the recessed portion (109) includes any one of a U-shape, a V-shape and a W-shape.

15. The battery according to claim 3 or 4, characterized in that The cover plate assembly (106) further includes a first insulating member (117), wherein the first insulating member (117) is disposed between the first current collecting member (110) and the second current collecting member (111).

16. A battery pack, characterized in that: The invention comprises a plurality of batteries (100) according to any one of claims 1 to 15.

17. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 16.

Images