Battery and electric device

Abstract

The utility model discloses a battery and a power utilization device, and belongs to the technical field of batteries, a top cover assembly comprises a top cover sheet and has a thickness direction, one side, facing an electrode assembly, of the top cover sheet is provided with a connecting groove, the connecting groove is provided with a first section and a second section which are communicated in the thickness direction, and an opening of the second section is communicated with a containing cavity. The first insulating part is located in the containing cavity and connected with the side, close to the electrode assembly, of the top cover piece, the side, away from the electrode assembly, of the first insulating part is provided with a connecting piece, and the connecting piece is embedded in the first section and the second section. The inner wall of the first section has the maximum size D1 mm in the length direction, the inner wall of the second section has the minimum size D2 mm in the length direction, the inner wall of the second section has the maximum size H mm in the thickness direction, and D2 is smaller than D1, and (D2 / D1) * H is larger than or equal to 0.075 and smaller than or equal to 0.90. By limiting the proportional relation of D1, D2 and H, effective limiting can be formed, the reliability of connection and fixation between the top cover piece and the first insulating part is improved, and local upwarp or falling of the first insulating part is avoided.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery and an electrical device. Background Art

[0002] In a conventional battery cover structure, the lower plastic of the cover is often fixed by a pole of the cover. When the lower plastic is long and is only fixed by the pole, there is a risk that the lower plastic will warp or fall off. Utility Model Content

[0003] Purpose of the utility model: The embodiment of the present application provides a battery, aiming to solve the technical problem that the lower plastic is easy to warp up or fall off; another purpose of the embodiment of the present application is to provide an electrical device.

[0004] Technical solution: The present application embodiment provides a battery, including:

[0005] A housing having a receiving cavity;

[0006] An electrode assembly is located in the accommodating cavity;

[0007] A top cover assembly, comprising a top cover sheet, the top cover sheet is connected to the shell and covers the accommodating cavity, the top cover sheet has a thickness direction, a side of the top cover sheet facing the electrode assembly has a connecting groove, the connecting groove has a first section and a second section connected in the thickness direction, and an opening of the second section is connected to the accommodating cavity;

[0008] A first insulating member is located in the accommodating cavity, the first insulating member is connected to a side of the top cover sheet close to the electrode assembly, and a connecting member is provided on a side of the first insulating member away from the electrode assembly, the connecting member is embedded in the first section and the second section, and the connecting member covers the opening of the second section;

[0009] The top cover sheet has a length direction intersecting with the thickness direction, and the inner wall of the first section has a maximum dimension D in the length direction. 1 mm, the inner wall of the second section has a maximum dimension D in the length direction 2 mm, the inner wall of the second section has a maximum dimension H mm in the thickness direction, satisfying: D 2 <D 1 , and 0.075≤(D 2 / D 1 )*H≤0.90.

[0010] In some embodiments, the battery further satisfies the following characteristics: 0.225≤(D 2 / D 1 )*H≤0.30.

[0011] In some embodiments, the battery further satisfies at least one of the following features:

[0012] a)0.4≤D 2 / D 1 ≤0.9;

[0013] b)0.3mm≤H≤1mm.

[0014] In some embodiments, the top cover sheet has a first surface and a second surface that are disposed in opposite directions along the thickness direction; the connecting groove is disposed on the second surface, and the connecting groove has a bottom wall; the first surface and the second surface have a maximum dimension A mm in the thickness direction; the second surface and the bottom wall have a maximum dimension B mm in the thickness direction, and the battery satisfies at least one of the following characteristics:

[0015] c) 0.15≤B / A≤0.80;

[0016] d) 1.5mm≤A≤2.5mm;

[0017] e)0.3mm≤B≤1.8mm.

[0018] In some embodiments, the top cover sheet has a first surface and a second surface disposed opposite to each other in the thickness direction, the connecting groove has a bottom wall, the second surface and the bottom wall have a maximum dimension B mm in the thickness direction, and satisfy: 0.3≤H / B≤0.6.

[0019] In some embodiments, a side of the top cover sheet close to the electrode assembly has a filling groove, and the filling groove surrounds the opening of the second section.

[0020] In some embodiments, the inner wall of the filling slot has a maximum dimension D in the length direction. 3 mm, satisfying: 0.4≤D 2 / D 3 ≤0.9.

[0021] In some embodiments, the top cover assembly includes a pole and a protruding structure, the pole is arranged on the top cover sheet, the top cover sheet has a pole hole, the pole hole penetrates the top cover sheet along the thickness direction, the pole is passed through the pole hole, the protruding structure is arranged on the side of the top cover sheet away from the electrode assembly, and is arranged around the pole hole, the protruding structure includes an extension portion and a limiting portion, the extension portion is connected to the side of the top cover sheet away from the electrode assembly, and is arranged around the pole hole; the limiting portion is fixedly connected to one end of the extension portion away from the top cover sheet, and extends toward the central axis of the pole hole.

[0022] In some embodiments, a second insulating member is included. The second insulating member is inserted into the pole hole. The second insulating member is located between the protruding structure and the pole and is connected to the protruding structure and the pole respectively.

[0023] In some embodiments, there are multiple connection grooves, which are spaced apart on one side of the top cover sheet close to the electrode assembly; there are multiple connectors, which are spaced apart on the insulating member, and the positions of the multiple connection grooves and the multiple connectors correspond to each other.

[0024] In some embodiments, the connecting member is a heat-staking column, and the heat-staking column fills the space in the connecting groove.

[0025] Accordingly, an embodiment of the present application provides an electrical device, comprising the above-mentioned battery, and the battery is used to supply power to the electrical device.

[0026] Beneficial effects: The battery of the embodiment of the present application includes a shell, an electrode assembly, a top cover assembly, and a first insulating member. The shell has a accommodating cavity. The electrode assembly is located in the accommodating cavity. The top cover assembly includes a top cover sheet, which is connected to the shell and covers the accommodating cavity. The top cover sheet has a thickness direction. The side of the top cover sheet facing the electrode assembly has a connecting groove. The connecting groove has a first section and a second section connected in the thickness direction, and the opening of the second section is connected to the accommodating cavity. The first insulating member is located in the accommodating cavity. The first insulating member is connected to a side of the top cover sheet close to the electrode assembly. The side of the first insulating member facing away from the electrode assembly has a connecting member, which is embedded in the first section and the second section, and the connecting member covers the opening of the second section. Among them, the top cover sheet has a length direction intersecting with the thickness direction, and the inner wall of the first section has a maximum dimension D in the length direction. 1 mm, the inner wall of the second section has a minimum dimension D in the length direction 2 mm, the inner wall of the second section has a maximum dimension Hmm in the thickness direction, satisfying: D 2 <D 1 , and 0.075≤(D 2 / D 1 )*H≤0.90. The connector is filled into the connecting groove by hot melting, so that the connector and the connecting groove are interlocked. By limiting the maximum dimension D of the inner wall of the first section in the length direction 1 , the minimum dimension D of the inner wall of the second section in the length direction 2 The proportional relationship with the maximum dimension H of the inner wall of the second section in the thickness direction can form an effective limit, improve the reliability of the connection and fixation between the top cover sheet and the first insulating member, and avoid local warping or falling off of the first insulating member.

[0027] The electrical device of the embodiment of the present application includes the above-mentioned battery, so the electrical device can have all the technical features and beneficial effects of the above-mentioned battery, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 1 is a schematic structural diagram of a battery in an embodiment of the present application;

[0030] Figure 2 is a cross-sectional view of a battery according to an embodiment of the present application;

[0031] Figure 3 is a cross-sectional view of a top cover sheet according to an embodiment of the present application;

[0032] Figure 4 yes Figure 3 A magnified view of part A;

[0033] Figure 5 is a structural schematic diagram of a first insulating member in an embodiment of the present application;

[0034] Figure 6 yes Figure 2 A partial enlarged view of

[0035] Figure 7 yes Figure 2 Enlarged view of part B.

[0036] Figure numerals: 1, shell; 2, top cover assembly; 3, first insulating member; 4, second insulating member; 5, sealing member; 10, accommodating cavity; 20, top cover plate; 21, connecting groove; 22, pole; 23, protruding structure; 30, connecting member; 200, first surface; 201, second surface; 202, pole hole; 203, step portion; 210, first section; 211, second section; 212, bottom wall; 213, filling groove; 230, extension portion; 231, limiting portion; X, thickness direction; Y, length direction. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0038] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined. In the description of this application, "vertical" means completely vertical at 90° or almost completely vertical, for example, an angle within the range of 80° to 100° is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel, for example, an angle within 10° of completely parallel is considered parallel.

[0039] In a conventional battery cover structure, the lower plastic of the cover is often fixed by a pole of the cover. When the lower plastic is long and is only fixed by the pole, there is a risk that the lower plastic will warp or fall off.

[0040] In view of this, the present application provides a battery and an electrical device, including a shell, an electrode assembly, a top cover assembly, and a first insulating member. The shell has a accommodating cavity. The electrode assembly is located in the accommodating cavity. The top cover assembly includes a top cover sheet, which is connected to the shell and covers the accommodating cavity. The top cover sheet has a thickness direction. The side of the top cover sheet facing the electrode assembly has a connecting groove. The connecting groove has a first section and a second section connected in the thickness direction, and the opening of the second section is connected to the accommodating cavity. The first insulating member is located in the accommodating cavity. The first insulating member is connected to a side of the top cover sheet close to the electrode assembly. The side of the first insulating member facing away from the electrode assembly has a connecting member, which is embedded in the first section and the second section, and the connecting member covers the opening of the second section. Among them, the top cover sheet has a length direction intersecting with the thickness direction, and the inner wall of the first section has a maximum dimension D in the length direction. 1 mm, the inner wall of the second section has a maximum dimension D in the length direction 2 mm, the inner wall of the second section has a maximum dimension H mm in the thickness direction, satisfying: D 2 <D 1 , and 0.075≤(D 2 / D 1)*H≤0.90. The connector is filled into the connecting groove by hot melting, so that the connector and the connecting groove are interlocked. By limiting the maximum dimension D of the inner wall of the first section in the length direction 1 , the minimum dimension D of the inner wall of the second section in the length direction 2 The proportional relationship with the maximum dimension H of the inner wall of the second section in the thickness direction can form an effective limit, improve the reliability of the connection and fixation between the top cover sheet and the first insulating member, and avoid local warping or falling off of the first insulating member.

[0041] The battery and the electric device of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0042] Figure 1 It is a schematic diagram of the structure of a battery according to an embodiment of the present application. Figure 2 It is a cross-sectional view of a battery according to an embodiment of the present application. Figure 3 It is a cross-sectional view of a top cover sheet 20 according to an embodiment of the present application. Figure 4 yes Figure 3 Enlarged view of part A. Figure 5 is a schematic structural diagram of a first insulating member 3 according to an embodiment of the present application, Figure 6 yes Figure 2 A partial enlarged view of . Figure 7 yes Figure 2 Enlarged view of part B. Figures 1 to 7 The battery of the embodiment of the present application includes a shell 1, an electrode assembly, a top cover assembly 2, and a first insulating member 3. The shell 1 has a receiving cavity 10. The electrode assembly is located in the receiving cavity 10. The top cover assembly 2 includes a top cover sheet 20, which is connected to the shell 1 and covers the receiving cavity 10. The top cover sheet 20 has a thickness direction X. The top cover sheet 20 has a connecting groove 21 on the side facing the electrode assembly. The connecting groove 21 has a first section 210 and a second section 211 connected in the thickness direction X, and the opening of the second section 211 is connected to the receiving cavity 10. The first insulating member 3 is located in the receiving cavity 10. The first insulating member 3 is connected to the side of the top cover sheet 20 close to the electrode assembly. The first insulating member 3 has a connecting member 30 on the side away from the electrode assembly. The connecting member 30 is embedded in the connecting groove 21, and the connecting member 30 covers the opening of the second section 211. Among them, the top cover sheet 20 has a length direction Y intersecting with the thickness direction X, and the inner wall of the first section 210 has a maximum dimension D in the length direction Y. 1 mm, the inner wall of the second section 211 has a minimum dimension D in the length direction Y. 2 mm, the inner wall of the second section 211 has a maximum dimension H mm in the thickness direction X, satisfying: D 2 <D 1 , and 0.075≤(D 2 / D1 )*H≤0.90. The connector 30 is filled into the connecting groove 21 by hot melting, so that the connector 30 and the connecting groove 21 are interlocked. By limiting the maximum dimension D of the inner wall of the first section 210 in the length direction Y 1 , the maximum dimension D of the inner wall of the second section 211 in the length direction Y 2 The proportional relationship with the maximum dimension H of the inner wall of the second section 211 in the thickness direction X can form an effective limit, thereby improving the reliability of the connection and fixation between the top cover sheet 20 and the first insulating member 3 and avoiding local warping or falling off of the first insulating member 3.

[0043] In some other embodiments, the battery further satisfies: 0.225≤(D 2 / D 1 )*H≤0.30. The connector 30 is filled into the connecting groove 21 by hot melting, so that the connector 30 and the connecting groove 21 are interlocked. By limiting the maximum dimension D of the inner wall of the first section 210 in the length direction Y 1 , the maximum dimension D of the inner wall of the second section 211 in the length direction Y 2 The proportional relationship with the maximum dimension H of the inner wall of the second section 211 in the thickness direction X can form an effective limit, further improving the reliability of the connection and fixation between the top cover sheet 20 and the first insulating member 3, and avoiding local warping or falling off of the first insulating member 3.

[0044] exist Figure 4 In the embodiment shown, the battery further satisfies: 0.4≤D 2 / D 1 ≤0.9, the minimum dimension D of the inner wall of the second section 211 in the length direction Y 2 smaller than the maximum dimension D of the inner wall of the first section 210 in the length direction Y 1 , by limiting the minimum dimension D of the inner wall of the second section 211 in the length direction Y 2 and the maximum dimension D of the inner wall of the first section 210 in the length direction Y 1 The proportional relationship can make the connecting piece 30 snap into the step portion 203 formed by the first section 210 protruding from the second section 211, effectively preventing the connecting piece 30 from escaping from the connecting groove 21, and increasing the tension between the top cover piece 20 and the first insulating piece 3, thereby ensuring the reliability of the connection and fixation between the top cover piece 20 and the first insulating piece 3.

[0045] exist Figure 4In the embodiment shown, the inner wall of the second section 211 has a maximum dimension Hmm in the thickness direction X, and the battery further satisfies: 0.3mm≤H≤1mm. Specifically, the maximum dimension H of the inner wall of the second section 211 in the thickness direction X can be any one of 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm or a range between any two values. In this way, it can be ensured that the protruding step portion 203 has sufficient mechanical strength, and the step portion 203 is not easily deformed when the top cover sheet 20 is subjected to tension.

[0046] In other embodiments, the battery further satisfies: 0.1mm≤H≤0.4mm. Specifically, the maximum dimension H of the inner wall of the second section 211 in the thickness direction X can be any one of 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, and 0.4mm, or a range between any two values. When the maximum dimension H of the inner wall of the second section 211 in the thickness direction X satisfies 0.1mm≤H≤0.4mm, it can be ensured that the protruding step portion 203 has sufficient mechanical strength, and the step portion 203 is not easily deformed when the top cover sheet 20 is subjected to tension.

[0047] exist Figure 4 In the illustrated embodiment, the top cover sheet 20 has a first surface 200 and a second surface 201 that are disposed in opposite directions along the thickness direction X. The connecting groove 21 is disposed on the second surface 201, and the connecting groove 21 has a bottom wall 212. The first surface 200 and the second surface 201 have a maximum dimension A mm in the thickness direction X, and the second surface 201 and the bottom wall 212 have a maximum dimension B mm in the thickness direction X. The battery satisfies: 0.15≤B / A≤0.80, that is, the ratio of the maximum dimension of the top cover sheet 20 in the thickness direction X to the maximum dimension of the connecting groove 21 in the thickness direction X is between 0.15 and 0.80. It can be understood that when the maximum dimension B of the second surface 201 and the bottom wall 212 in the thickness direction X is too large, the ratio becomes larger, resulting in a gap when the connecting member 30 is filled in the connecting groove 21, resulting in a poor hot melt effect, so that the tension between the top cover sheet 20 and the first insulating member 3 is reduced. When the maximum dimension B of the second surface 201 and the bottom wall 212 in the thickness direction X is too small, referring to Example 1 and Example 2, when B / A≤0.15, the filling space of the connection groove 21 becomes smaller, and the volume of the connection member 30 in the connection groove 21 becomes smaller, so that the tension between the top cover sheet 20 and the first insulating member 3 is reduced. By controlling the proportional relationship between the maximum dimension B of the second surface 201 and the bottom wall 212 in the thickness direction X and the maximum dimension A of the first surface 200 and the second surface 201 in the thickness direction X, the tension between the top cover sheet 20 and the first insulating member 3 can be increased, thereby ensuring the reliability of the connection and fixation between the top cover sheet 20 and the first insulating member 3.

[0048] In other embodiments, the battery further satisfies: 0.2≤B / A≤0.6. Referring to Examples 13 to 16, when 0.5≤B / A≤0.6 is satisfied, the tension between the first insulating member 3 and the top cover sheet 20 is greater than 70N, which can ensure that the protruding step portion 203 has sufficient mechanical strength and the step portion 203 is not easily deformed when the top cover sheet 20 is subjected to tension.

[0049] In some embodiments, the battery further satisfies: 1.5mm≤A≤2.5mm. Specifically, the maximum dimension A of the first surface 200 and the second surface 201 in the thickness direction X can be any value of 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, or a range between any two values.

[0050] In some embodiments, the battery further satisfies: 0.3mm≤B≤1.8mm. Specifically, the maximum dimension B of the second surface 201 and the bottom wall 212 in the thickness direction X can be any one of 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, and 1.8mm, or a range between any two values. In other embodiments, the maximum dimension B of the second surface 201 and the bottom wall 212 in the thickness direction X further satisfies: 0.3mm≤B≤1mm. Specifically, the maximum dimension B of the second surface 201 and the bottom wall 212 in the thickness direction X can be any one of 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, and 0.8mm, or a range between any two values. With reference to Embodiments 3, 4, 6, 8, 9, 12, 13, 14, and 15, when 0.3mm≤B≤1mm is satisfied, it can be ensured that the protruding step portion 203 has sufficient mechanical strength, and the step portion 203 is not easily deformed when the top cover sheet 20 is subjected to tension.

[0051] In some embodiments, the top cover sheet 20 has a first surface 200 and a second surface 201 that are arranged in opposite directions along the thickness direction X, the connecting groove 21 has a bottom wall 212, and the second surface 201 and the bottom wall 212 have a maximum dimension B mm in the thickness direction X, satisfying: 0.3≤H / B≤0.6, that is, the ratio of the maximum dimension of the step portion 203 in the thickness direction X to the maximum dimension of the connecting groove 21 in the thickness direction X satisfies 0.3≤H / B≤0.6. It can be understood that when the thickness of the step portion 203 is too small, the mechanical strength of the step portion 203 is insufficient and it is easy to deform, resulting in a reduction in the tension between the top cover sheet 20 and the first insulating member 3. When the thickness of the step portion 203 is too large, the volume of the connecting member 30 clamped between the step portion 203 and the bottom wall 212 becomes smaller, resulting in a reduction in the tension between the top cover sheet 20 and the first insulating member 3. By controlling the proportional relationship between the maximum dimension H of the inner wall of the second section 211 in the thickness direction X and the maximum dimension B of the second surface 201 and the bottom wall 212 in the thickness direction X, it can be ensured that the protruding step portion 203 has sufficient mechanical strength and is not easily deformed when the top cover piece 20 is subjected to tension, thereby improving the reliability of the connection and fixation between the top cover piece 20 and the first insulating member 3.

[0052] exist Figure 4 In the illustrated embodiment, the top cover sheet 20 has a filling groove 213 on one side close to the electrode assembly, and the filling groove 213 surrounds the opening of the second section 211. The inner wall of the filling groove 213 has a maximum dimension D in the length direction Y. 3 mm, satisfying: 0.4≤D 2 / D 3 It is understandable that the filling groove 213 is connected to the connecting groove 21, and the connecting member 30 is hot-melted and filled in the connecting groove 21 and the filling groove 213, which can increase the filling volume of the connecting member 30, thereby improving the reliability of the connection and fixation between the top cover sheet 20 and the first insulating member 3.

[0053] exist Figure 5 In the illustrated embodiment, the connecting member 30 is a hot melt column that fills the space in the connecting groove 21. Figures 3 to 5 The maximum dimension of the hot melt column in the length direction Y is smaller than the maximum dimension D of the inner wall of the second section 211 in the length direction Y. 2. Such a configuration makes it easy to insert the hot melt column into the connecting groove 21 and heat it up to melt it, and the molten melt fills the connecting groove 21. The maximum dimension of the hot melt column in the thickness direction X is greater than the maximum dimension B of the second surface 201 and the bottom wall 212 in the thickness direction X. The height of the hot melt column is greater than the height of the connecting groove 21, which can reduce the gap in the connecting groove 21, thereby improving the reliability of the connection and fixation between the top cover sheet 20 and the first insulating member 3. In some embodiments, the ratio of the volume of the hot melt column to the filling volume of the connecting groove 21 is between 0.1 and 1. In an embodiment of the present application, the ratio of the volume of the hot melt column to the filling volume of the connecting groove 21 is 1, so that the molten melt completely fills the connecting groove 21, ensuring the reliability of the connection and fixation between the top cover sheet 20 and the first insulating member 3.

[0054] In some embodiments, there are multiple connection grooves 21, and multiple connection grooves 21 are arranged at intervals on the side of the top cover sheet 20 close to the electrode assembly. There are multiple connectors 30, and multiple connectors 30 are arranged at intervals on the insulating member, and the positions of the multiple connection grooves 21 and the multiple connectors 30 correspond to each other. Such an arrangement can further improve the reliability of the connection and fixation between the top cover sheet 20 and the first insulating member 3, and avoid the problem of the first insulating member 3 being lifted or falling off.

[0055] exist Figure 7 In the embodiment shown, the top cover assembly 2 includes a pole 22 and a protruding structure 23, the pole 22 is provided on the top cover sheet 20, the top cover sheet 20 has a pole hole 202, the pole hole 202 penetrates the top cover sheet 20 along the thickness direction X, the pole 22 is penetrated in the pole hole 202, the protruding structure 23 is provided on the side of the top cover sheet 20 away from the electrode assembly, and is arranged around the pole hole 202, the protruding structure 23 includes an extension 230 and a limiting portion 231, the extension 230 is connected to the side of the top cover sheet 20 away from the electrode assembly, and is arranged around the pole hole 202; the limiting portion 231 is fixedly connected to one end of the extension 230 away from the top cover sheet 20, and extends toward the central axis of the pole hole 202. In the embodiment of the present application, the protruding structure 23 is integrally formed with the top cover sheet 20, which can reduce the processing difficulty of the top cover sheet 20.

[0056] exist Figure 7 In the illustrated embodiment, a second insulating member 4 is included, the second insulating member 4 is passed through the pole hole 202, and the second insulating member 4 is located between the protruding structure 23 and the pole 22 and is respectively connected to the protruding structure 23 and the pole 22. The second insulating member 4 is formed by injection molding, so that the sealing of the top cover assembly 2 can be ensured, and the second insulating member 4 can fix the pole 22, thereby improving the connection stability between the pole 22 and the top cover sheet 20.

[0057] exist Figure 7In the illustrated embodiment, the battery includes a seal 5, which is disposed around the pole body 310, and the seal 5 is sandwiched between the bottom plate 4 and the pole body 310. Thus, the sealing performance of the top cover assembly 2 can be improved.

[0058] In the embodiment of the present application, a tension measurement method is provided for measuring the tension between the first insulating member 3 and the top cover sheet 20. A cable tie with a width of 3 mm is passed between the first insulating member 3 and the top cover sheet 20. A tension is applied to the top cover sheet 20 at a rate of 50 mm / min by a tensile testing machine, and the connection strength between the top cover sheet 20 and the first insulating member 3 is determined by recording the tension applied by the tensile testing machine when the cable tie breaks. The test results are shown in Table 1.

[0059] Table 1:

[0060]

[0061] From Table 1, we can see that when D 2 <D 1 , and 0.075≤(D 2 / D 1 )*H≤0.90, the tension between the first insulating member and the top cover sheet is greater than or equal to 46.52N, and the connection strength between the first insulating member and the top cover sheet is good.

[0062] Furthermore, 0.225≤(D 2 / D 1 )*H≤0.30, the tension between the first insulating member and the top cover sheet is greater than or equal to 87.19N, and the connection strength between the first insulating member and the top cover sheet is better.

[0063] In meeting D 2 <D 1 , and 0.075≤(D 2 / D 1 )*H≤0.90, when 0.3mm≤H≤1mm is set within this range, the pulling force between the first insulating member and the top cover sheet is greater than or equal to 57.74N, and the connection strength between the first insulating member and the top cover sheet is good.

[0064] In meeting D 2 <D 1 , and 0.075≤(D 2 / D 1 )*H≤0.90, when 0.15≤B / A≤0.80 is set within this range, the tension between the first insulating member and the top cover sheet is greater than or equal to 57.74N, and the connection strength between the first insulating member and the top cover sheet is good.

[0065] In meeting D 2 <D 1, and 0.075≤(D 2 / D 1 )*H≤0.90, when 0.3≤H / B≤0.6 is set within this range, the tension between the first insulating member and the top cover sheet is greater than or equal to 46.52N, and the connection strength between the first insulating member and the top cover sheet is good.

[0066] The embodiment of the present application provides an electric device, including the above-mentioned battery, and the battery is used to supply power to the electric device. It is understandable that the electric device includes the functions of the battery described in the above embodiment, which will not be repeated here.

[0067] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0068] The above is a detailed introduction to a battery and an electrical device provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: A housing having a receiving cavity; An electrode assembly, located in the accommodating cavity; A top cover assembly, comprising a top cover sheet, the top cover sheet is connected to the shell and covers the accommodating cavity, the top cover sheet has a thickness direction, a side of the top cover sheet facing the electrode assembly has a connecting groove, the connecting groove has a first section and a second section connected in the thickness direction, and an opening of the second section is connected to the accommodating cavity; a first insulating member, located in the accommodating cavity, connected to a side of the top cover sheet close to the electrode assembly, and having a connecting member on a side of the first insulating member away from the electrode assembly, the connecting member being embedded in the first section and the second section, and the connecting member covering an opening of the second section; Among them, the top cover sheet has a length direction intersecting with the thickness direction, the inner wall of the first section has a maximum dimension D1mm in the length direction, the inner wall of the second section has a maximum dimension D2mm in the length direction, and the inner wall of the second section has a maximum dimension Hmm in the thickness direction, satisfying: D2<D1, and 0.075≤(D2 / D1)*H≤0.

90.

2. The battery according to claim 1, characterized in that The battery further satisfies the following characteristic: 0.225≤(D2 / D1)*H≤0.

30.

3. The battery according to claim 1, characterized in that The battery further satisfies at least one of the following features: a) 0.4≤D2 / D1≤0.9; b)0.3mm≤H≤1mm.

4. The battery according to claim 1, characterized in that The top cover sheet has a first surface and a second surface that are arranged in opposite directions along the thickness direction; the connecting groove is arranged on the second surface, and the connecting groove has a bottom wall; the first surface and the second surface have a maximum dimension A mm in the thickness direction; the second surface and the bottom wall have a maximum dimension B mm in the thickness direction, and the battery satisfies at least one of the following characteristics: c) 0.15≤B / A≤0.80; d) 1.5mm≤A≤2.5mm; e)0.3mm≤B≤1.8mm.

5. The battery according to claim 1, characterized in that The top cover sheet has a first surface and a second surface which are arranged opposite to each other in the thickness direction, the connection groove has a bottom wall, the second surface and the bottom wall have a maximum dimension B mm in the thickness direction, and satisfy: 0.3≤H / B≤0.

6.

6. The battery according to claim 1, characterized in that A filling groove is formed on a side of the top cover sheet close to the electrode assembly, and the filling groove surrounds the opening of the second section.

7. The battery according to claim 6, characterized in that The inner wall of the filling groove has a maximum dimension D3 mm in the length direction, satisfying: 0.4≤D2 / D3≤0.

9.

8. The battery according to claim 1, characterized in that The top cover assembly includes a pole and a protruding structure, wherein the pole is arranged on the top cover sheet, and the top cover sheet has a pole hole, wherein the pole hole penetrates the top cover sheet along the thickness direction, and the pole is passed through the pole hole. The protruding structure is arranged on a side of the top cover sheet away from the electrode assembly and is arranged around the pole hole. The protruding structure includes an extending portion and a limiting portion, wherein the extending portion is connected to a side of the top cover sheet away from the electrode assembly and is arranged around the pole hole; the limiting portion is fixedly connected to an end of the extending portion away from the top cover sheet and extends toward the central axis of the pole hole.

9. The battery according to claim 8, characterized in that A second insulating member is included, wherein the second insulating member is passed through the pole hole, and the second insulating member is located between the protruding structure and the pole and is connected to the protruding structure and the pole respectively.

10. The battery according to claim 1, characterized in that There are a plurality of connection grooves, which are spaced apart on a side of the top cover sheet close to the electrode assembly; there are a plurality of connectors, which are spaced apart on the insulating member, and positions of the plurality of connection grooves and the plurality of connectors correspond to each other; and / or The connecting piece is a heat-melting column, and the heat-melting column fills the space in the connecting groove.

11. An electrical device, characterized in that: The invention comprises the battery according to any one of claims 1 to 9, wherein the battery is used to supply power to the electrical device.

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