Battery housing, battery and power-using device

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and specifically relates to a battery shell, a battery and an electrical device, including an outer shell and a top cover arranged on the outer shell, the top cover includes a metal end cover and a pole insulated from the metal end cover, the metal end cover includes a support member and an extension member arranged around the support member, the extension member extends downward from the support member, the extension member is welded to the outer shell, and the extension member is partially embedded in the outer shell. The utility model adopts a structure in which the extension member is welded to the outer shell, so that when the outer shell and the top cover are welded, the situation in which the top cover and the outer shell are not matched due to welding excess height can be avoided; at the same time, the downwardly extending extension member can reduce the thickness of the top cover embedded in the outer shell, thereby reducing the overall thickness of the outer shell and increasing the volume energy density of the battery.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production and manufacturing, and specifically relates to a battery shell, a battery and an electrical device. Background Art

[0002] Nowadays, with the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium-ion batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, which provides a broad space for the application and development of lithium-ion batteries.

[0003] Among them, the steel shell button battery is a common battery structure. Its assembly method is to embed the flat cover into the straight shell structure for compounding. The platform cover is flush with the upper end of the shell. The matching compound process is prone to the cover not being properly closed. In addition, when welding, there is a welding excess height at the weld point in the height and width directions, which increases the battery size and affects the volume energy density. Therefore, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content

[0004] One of the purposes of the utility model is to address the deficiencies of the prior art and provide a battery housing that is welded to the outer shell by providing an extension piece extending downward, thereby avoiding welding excess height and reducing the thickness of the housing.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A battery casing comprises an outer shell and a top cover arranged on the outer shell, the top cover comprises a metal end cover and a pole insulated from the metal end cover, the metal end cover comprises a support member and an extension member arranged around the support member, the extension member extends downward from the support member, the extension member is welded to the outer shell, and the extension member is partially embedded in the outer shell.

[0007] In practical applications, the thickness of the extension piece embedded in the shell is smaller, which can reduce the thickness of the shell compared to conventional structures; at the same time, the use of the extension piece for welding can avoid the situation where the top cover and the shell are not matched due to welding excess height.

[0008] As an improvement of the battery casing described in the utility model, the plane where the lower surface of the support member is located and the plane where the lower surface of the extension member is located form an angle α, and the angle α is set to an obtuse angle. Preferably, the angle α is set to 110°-150°.

[0009] As an improvement of the battery housing of the utility model, the extension member includes an integrally formed extension body and a welding portion, the extension body is connected to the support member, and the welding portion is embedded in the housing.

[0010] As an improvement of the battery shell described in the utility model, the depth W of the welding portion embedded in the shell is 0.01mm≤W≤0.03mm; the length L of the extension piece is 0.12mm≤L≤0.18mm. The setting of the extension piece length and the angle α can prevent the extension piece from squeezing the electrode assembly inside the battery shell during the battery manufacturing process, thereby preventing the extension piece from reducing the volume of the electrode assembly that can be accommodated in the battery shell, thereby ensuring the volume energy density of the battery.

[0011] As an improvement of the battery housing of the utility model, the support member is provided with a through hole, the pole passes through the through hole and is fixedly installed with the support member, and a sealing insulating member is provided between the pole and the support member. In practical applications, the polarity of the housing is opposite to that of the pole, and the sealing insulating member can prevent the positive and negative poles from being directly connected to cause a short circuit, and can also increase the physical strength of the top cover.

[0012] As an improvement of the battery housing of the utility model, the widths of the support member, the sealing insulating member and the pole in the width direction of the battery are reduced in sequence.

[0013] As an improvement of the battery shell described in the utility model, the shell is bent inwardly facing the top cover to form a bent piece, the side of the bent piece facing the inside of the shell is in contact with the support piece, and the side of the bent piece facing the pole is in contact with the sealing insulating piece, the width of the bent piece in the width direction is D1, and the distance between the outer edge of the pole and the outer edge of the support piece in the width direction is D2, and D1 and D2 satisfy the relationship: D1<D2, 0.45mm≤D1≤0.55mm, which further prevents the shell and the pole with opposite polarities from being connected, prevents short circuits, and increases the safety of the battery.

[0014] As an improvement of the battery shell described in the utility model, insulating tape is pasted on the side of the bending piece away from the supporting piece, and a roller groove is provided on the outer side of the outer shell corresponding to the welding part, and the insulating tape can further prevent the occurrence of short circuit; the arrangement of the insulating tape and the bending piece prevents the existence of gaps in the top cover, thereby preventing dust and other debris from falling into the top cover, thereby ensuring the tightness of the top cover.

[0015] The second object of the present utility model is to provide a battery, comprising the battery casing as described above and an electrode assembly located in the battery casing.

[0016] The second purpose of the utility model is to provide an electrical device, comprising the battery as described above.

[0017] The beneficial effect of the utility model is that the battery housing of the utility model includes an outer shell and a top cover arranged on the outer shell, the top cover includes a metal end cover and a pole insulated from the metal end cover, the metal end cover includes a support member and an extension member arranged around the support member, the extension member extends downward from the support member, the extension member is welded to the outer shell, and the extension member is partially embedded in the outer shell. Compared with the existing method of welding a disc-shaped metal end cover to an outer shell, the structure of partially welding and embedding the extension member at the buckling point of the outer shell and the top cover adopted by the utility model can reduce the thickness of the outer shell increased due to the need to be welded with the top cover, thereby reducing the overall thickness of the outer shell, thereby increasing the volume of the electrode assembly in the battery and increasing the volume energy density of the battery; at the same time, it can also avoid the situation in which the outer shell and the top cover do not match due to the excess welding height during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the structural section of the utility model.

[0020] Figure 2 for Figure 1 Enlarged detail of point A in the middle.

[0021] Figure 3 It is a cross-sectional schematic diagram of a portion of the outer shell of the utility model before rolling.

[0022] Figure 4 It is a schematic diagram of the structure of the battery in the utility model.

[0023] Figure 5 It is a schematic diagram of the structural cross section of the battery in the utility model.

[0024] The reference numerals are described as follows:

[0025] 1-housing; 11-bending part; 12-roller notch;

[0026] 2-top cover; 21-metal end cover; 211-support member; 212-extension member; 2121-extension body; 2122-welding portion; 22-pole; 23-sealed insulating member;

[0027] 3-Insulation tape;

[0028] 100-battery housing;

[0029] 200-electrode assembly; 201-positive electrode sheet; 202-negative electrode sheet; 203-diaphragm; 204-positive electrode tab; 205-negative electrode tab;

[0030] H-height direction;

[0031] K-width direction. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific implementation methods and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0034] Reference to "embodiment" in this application means that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0037] The battery includes a housing, an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0038] The development of battery technology must take into account many design factors at the same time, for example, energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters, among which the energy density of the battery is a relatively important parameter. In order to make the battery have a higher volume energy density, this embodiment provides an extension on the top cover for connection with the outer shell, thereby increasing the volume energy density of the battery by reducing the thickness of the battery shell.

[0039] The following is combined with Figures 1 to 5 The utility model is further described in detail with specific implementation methods, but is not intended to limit the utility model. It should be noted that the dotted lines in the drawings are used to distinguish component settings and do not exist in reality.

[0040] like Figure 1 and Figure 2 As shown, a battery casing comprises an outer shell 1 and a top cover 2 covered on the outer shell 1, the top cover 2 comprises a metal end cover 21 and a pole 22 insulated from the metal end cover 21, the metal end cover 21 comprises a support member 211 and an extension member 212 arranged around the support member 211, the extension member 212 extends downward from the support member 211, the extension member 212 comprises an integrally formed extension body 2121 and a welding portion 2122, the extension body 2121 is connected to the support member 211, and the welding portion 2122 is embedded in the outer shell 1.

[0041] In practical applications, the welding portion 2122 is a component of the buckling point where the extension piece 212 is embedded in the outer shell 1. The embedded thickness of the welding portion 2122 is relatively small. Compared with the conventional structure, the overall thickness of the outer shell 1 can be reduced, thereby increasing the volume of the electrode assembly in the battery and increasing the volume energy density of the battery. At the same time, the use of the extension piece for welding can avoid the situation where the top cover and the shell are not matched due to the excess welding height.

[0042] Specifically, the plane where the lower surface of the support member 211 is located and the plane where the lower surface of the extension member 212 is located form an angle α, and the angle α is set to an obtuse angle. The angle α is set to 110°-150°. The setting of the above angles is the preferred angle α, which can further reduce the depth of the welding portion 2122 embedded in the shell 1, thereby ensuring that the extension member 212 can reduce the overall thickness of the shell 1. It can be understood that in some other embodiments, the angle α can be other angles and can be changed according to actual needs.

[0043] Specifically, in the width direction K, the welding portion 2122 is embedded in the housing 1 to a depth W, 0.01 mm≤W≤0.03 mm. For example, the value of W can be set to 0.01 mm, 0.02 mm or 0.03 mm.

[0044] Specifically, the length L of the extension member 212 is 0.12mm≤L≤0.18mm. For example, the value of L can be set to 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm or 0.18mm. During the battery manufacturing process, the length of the extension member 212 and the setting of the angle α can prevent the extension member 212 from squeezing the electrode assembly inside the battery shell, thereby preventing the extension member 212 from reducing the volume of the electrode assembly that can be accommodated in the battery shell, thereby ensuring the volume energy density of the battery.

[0045] Specifically, in the height direction H, the pole 22, the sealing insulating member 23 and the metal end cover 21 are stacked in sequence, the support member 211 is provided with a through hole, the pole 22 passes through the through hole and is fixedly installed with the support member 211, a sealing insulating member 23 is arranged between the pole 22 and the support member 211, and the widths of the support member 211, the sealing insulating member 23 and the pole 22 in the width direction K of the battery decrease in sequence. In actual applications, the polarity of the outer shell 1 is opposite to that of the pole 2, and the sealing insulating member 23 can avoid direct connection between the positive and negative poles to cause a short circuit, and can also increase the physical strength of the top cover 1.

[0046] Specifically, the outer shell 1 is bent inwardly facing the top cover 2 to form a bending piece 11, and the side of the bending piece 11 facing the inside of the outer shell 1 is in contact with the support piece 211, and the side of the bending piece 11 facing the pole 22 is in contact with the sealing insulating piece 23. The width of the bending piece 11 in the width direction K is D1, and the distance between the outer edge of the pole 22 and the outer edge of the support piece 211 in the width direction K is D2. D1 and D2 satisfy the relationship: D1<D2, 0.45mm≤D1≤0.55mm, that is, there is a gap between the edge of the pole 22 and the bending piece 11 in the width direction K, which further prevents the outer shell 1 and the pole 22 with opposite polarities from being connected, prevents short circuits, and increases the safety of the battery.

[0047] Specifically, the side of the bending member 11 away from the supporting member 211 is pasted with insulating tape 3, such as Figure 3 As shown, a roller notch 12 is provided on the outer side of the housing 1 corresponding to the welding portion 2122 .

[0048] In actual application, the bending piece 11 is formed by rolling the portion of the shell 1 that exceeds the fitting point between the shell 1 and the top cover 2. The roller groove used for rolling has a protrusion that matches the roller groove 12. The setting of the roller groove 12 can increase the fit between the welding portion 2122 and the shell 1 when the battery shell is rolled, thereby increasing the tightness of the connection. After rolling, the insulating tape 3 is pasted, and the insulating tape 3 further prevents the occurrence of short circuits. The setting of the insulating tape 3 and the bending piece 11 prevents gaps in the top cover 2, thereby preventing dust and other debris from falling into the top cover 2, thereby ensuring the tightness of the top cover 2.

[0049] Battery

[0050] like Figure 4 and Figure 5 As shown, a battery comprises the battery housing 100 as described above and an electrode assembly 200 located in the battery housing 100, wherein the electrode assembly 200 comprises a positive electrode sheet 201, a separator 203 and a negative electrode sheet 202 arranged in sequence, wherein the positive electrode sheet 201 extends a positive electrode tab 204, the positive electrode tab 204 is electrically connected to the pole 22, and the negative electrode sheet 202 extends a negative electrode tab 205, and the negative electrode tab 205 and the positive electrode tab 204 are at both ends in the height direction H, and the negative electrode tab 205 is connected to the bottom of the housing 1. It can be understood that the steel shell button battery can be a lithium ion battery, a sodium ion battery, a magnesium ion battery, etc.

[0051] Electrical devices

[0052] An electrical device, comprising a battery as described above, wherein the electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0053] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A battery casing, comprising an outer shell (1) and a top cover (2) covering the outer shell (1), wherein the top cover (2) comprises a metal end cover (21) and a pole (22) insulated from the metal end cover (21), characterized in that: The metal end cover (21) comprises a support member (211) and an extension member (212) arranged around the support member (211); the extension member (212) extends downward from the support member (211); the extension member (212) is welded to the outer shell (1); and a portion of the extension member (212) is embedded in the outer shell (1).

2. The battery case according to claim 1, characterized in that: The plane where the lower surface of the support member (211) is located and the plane where the lower surface of the extension member (212) is located form an angle α, and the angle α is set to be an obtuse angle.

3. The battery case according to claim 1, characterized in that: The extension member (212) comprises an integrally formed extension body (2121) and a welding portion (2122); the extension body (2121) is connected to the support member (211); and the welding portion (2122) is embedded in the housing (1).

4. The battery case according to claim 3, characterized in that: The welding portion (2122) is embedded in the housing (1) to a depth W of 0.01 mm ≤ W ≤ 0.03 mm; and the extension piece (212) has a length L of 0.12 mm ≤ L ≤ 0.18 mm.

5. The battery case according to claim 3, characterized in that: The support member (211) is provided with a through hole, the pole (22) passes through the through hole and is fixedly mounted on the support member (211), and a sealing insulating member (23) is provided between the pole (22) and the support member (211).

6. The battery case according to claim 5, characterized in that: The widths of the support member (211), the sealing insulating member (23) and the pole (22) decrease in sequence in the width direction (K) of the battery.

7. The battery case according to claim 6, characterized in that: The outer shell (1) is bent inwardly toward the top cover (2) to form a bent piece (11); a side of the bent piece (11) facing the inside of the outer shell (1) is in contact with the support piece (211); a side of the bent piece (11) facing the pole (22) is in contact with the sealing insulating piece (23); the bent piece (11) has a width D1 in the width direction (K); a distance D2 between an outer edge of the pole (22) and an outer edge of the support piece (211) in the width direction (K); and D1 and D2 satisfy the relationship: D1<D2, 0.45mm≤D1≤0.55mm.

8. The battery case according to claim 7, characterized in that: An insulating tape (3) is adhered to a side of the bending member (11) away from the supporting member (211), and a roller notch (12) is provided on the outer side of the housing (1) corresponding to the welding portion (2122).

9. A battery, characterized in that: It comprises a battery casing (100) as claimed in any one of claims 1 to 8 and an electrode assembly (200) located in the battery casing (100).

10. An electrical device, characterized in that: Comprising the battery as claimed in claim 9.

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