Battery roll core, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery roll core, a battery and electric equipment. The battery roll core comprises a positive plate, a diaphragm and a negative plate, wherein the positive plate, the diaphragm and the negative plate are laminated and wound to form a roll core main body; the positive plate is provided with a first empty foil which extends out of the roll core main body and is a non-tab welding area, the negative plate is provided with a second empty foil which extends out of the roll core main body and is a non-tab welding area, the first empty foils of all layers in the roll core main body are welded and connected, and the second empty foils of all layers in the roll core main body are welded and connected. The battery and the electric equipment comprise the battery roll core, the first empty foils of all layers in the roll core main body are welded and connected, and the second empty foils of all layers in the roll core main body are welded and connected, so that the contact area of a non-tab position of a positive plate and the contact area of a non-tab position of a negative plate are increased, the internal resistance of the battery roll core is reduced, and the service life of the battery roll core is prolonged. Therefore, the charge-discharge rate of the battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery roll core, battery and electric equipment. BACKGROUND

[0002] The battery roll core is wound by negative pole sheet, positive pole sheet and diaphragm between the positive pole sheet and the negative pole sheet to prevent short circuit. The positive pole sheet and the negative pole sheet are usually in the form of sheet, and the negative pole sheet, the diaphragm and the positive pole sheet are stacked and wound in sequence into the shape of cylinder or flat track. Then, the battery roll core is put into the shell made of stainless steel, nickel-plated iron or aluminum, and finally the electrolyte is injected to package into the battery.

[0003] At present, the aluminum foil and the copper foil are respectively used as the current collector of the positive pole sheet and the negative pole sheet. The longer the pole sheet is, the greater the foil resistance is, and the worse the current collecting effect is, which limits the large current discharge of the battery and weakens the charge-discharge rate performance of the battery. SUMMARY

[0004] The utility model discloses a battery roll core, battery and electric equipment to reduce the internal resistance of the battery roll core and improve the charge-discharge rate of the battery.

[0005] To achieve the purpose, the utility model adopts the technical scheme that:

[0006] The battery roll core comprises a positive pole sheet, a diaphragm and a negative pole sheet, the positive pole sheet, the diaphragm and the negative pole sheet are stacked and wound to form a roll core main body;

[0007] The positive pole sheet is provided with a first empty foil protruding from the roll core main body and being a non-tab welding area, the negative pole sheet is provided with a second empty foil protruding from the roll core main body and being a non-tab welding area, the first empty foils of each layer in the roll core main body are welded and connected, and the second empty foils of each layer in the roll core main body are welded and connected.

[0008] As an optional scheme of the battery roll core, the roll core main body is provided with a positive pole lug and a negative pole lug outwardly extending at one end along the axial direction, and the roll core main body is provided with the first empty foil and the second empty foil outwardly extending at the other end along the axial direction.

[0009] As an optional scheme of the battery roll core, the positive pole sheet is provided with at least two first empty foils on one side along the width direction, and the at least two first empty foils are arranged at intervals along the length direction of the positive pole sheet, the negative pole sheet is provided with at least two second empty foils on one side along the width direction, and the at least two second empty foils are arranged at intervals along the length direction of the negative pole sheet.

[0010] In the core body, each layer of the core has two first empty foils arranged opposite along the thickness direction of the core body and two second empty foils arranged opposite along the thickness direction of the core body.

[0011] As an optional solution of the battery core, the interval between adjacent three first empty foils gradually increases along the length direction of the positive plate, and the interval between adjacent three second empty foils gradually increases along the length direction of the negative plate.

[0012] As an optional solution of the battery core, the first empty foil extends out of the core body by 3-4 mm, and the second empty foil extends out of the core body by 3-4 mm.

[0013] As an optional solution of the battery core, the battery core further comprises an insulating member, and the outer surface of the first empty foil connected by welding is wrapped with the insulating member, and the outer surface of the second empty foil connected by welding is wrapped with the insulating member.

[0014] As an optional solution of the battery core, the insulating member is an insulating tape.

[0015] As an optional solution of the battery core, the battery core further comprises an end sticking tape, which is pasted on the outermost layer of the core body to fix the winding of the core body.

[0016] A battery comprising the battery core.

[0017] An electric device comprising the battery.

[0018] The battery core has the following beneficial effects:

[0019] The battery core has the following beneficial effects:

[0020] The battery comprising the battery core has the following beneficial effects:

[0021] The electric device comprising the battery has the following beneficial effects: Attached Figure Description

[0022] Figure 1 This is a front view of a positive electrode sheet with a positive electrode tab welded on it, provided in an embodiment of this utility model;

[0023] Figure 2 This is a front view of a negative electrode sheet with welded negative electrode tabs provided in an embodiment of this utility model;

[0024] Figure 3 This is a front view of the battery core provided in this embodiment of the utility model;

[0025] Figure 4 This is a first longitudinal sectional view of the battery core provided in this embodiment of the present invention;

[0026] Figure 5 This is a second longitudinal sectional view of the battery core provided in this embodiment of the present invention;

[0027] Figure 6 This is an end view of the battery core provided in this embodiment of the utility model.

[0028] The component names and labels in the diagram are as follows:

[0029] 10. Core body; 1. Positive electrode sheet; 11. First dressing area; 12. First welding area; 13. First empty foil; 2. Separator; 3. Negative electrode sheet; 31. Second dressing area; 32. Second welding area; 33. Second empty foil; 4. Positive electrode tab; 5. Negative electrode tab; 6. Insulating component. Detailed Implementation

[0030] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature "on", "above" and "upper surface of" second feature includes that first feature is directly above and obliquely above second feature, or only indicates that horizontal height of first feature is higher than second feature. First feature "under", "below" and "under surface of" second feature includes that first feature is directly below and obliquely below second feature, or only indicates that horizontal height of first feature is less than second feature.

[0033] In the description of the embodiment, the terms "upper", "lower", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0034] The technical scheme of the utility model is further illustrated below by specific embodiments in combination with the drawings.

[0035] The embodiment provides a battery, which comprises a shell and a battery roll core, the battery roll core is installed in the shell, and electrolyte is injected into the shell to ensure that the battery roll core is fully soaked in the electrolyte. Since the battery is prior art, the structural components and preparation process of the battery are not described again.

[0036] As shown in Figure 1 and Figure 2 , the embodiment further provides a battery roll core, which comprises a positive plate 1, a diaphragm 2 and a negative plate 3. The base material of the positive plate 1 is aluminum foil, and the base material of the negative plate 3 is copper foil. The positive plate 1 has a first welding area 12 and a first coating area 11 along the length direction (the left-right direction in the figure), the surface of the first coating area 11 is coated with a positive coating layer, the first welding area 12 is a blank foil area, and a positive lug 4 is welded to the first welding area 12. The negative plate 3 has a second welding area 32 and a second coating area 31 along the length direction (the left-right direction in the figure), the surface of the second coating area 31 is coated with a negative coating layer, the second welding area 32 is a blank foil area, and a negative lug 5 is welded to the first welding area 12.

[0037] As shown in Figure 3 , the positive plate 1, the diaphragm 2 and the negative plate 3 are stacked and wound to form a roll core body 10, and the roll core body 10 has a flat track structure (as shown in Figure 6The first dressing area 11 of the positive electrode sheet 1 and the second dressing area 31 of the negative electrode sheet 3 are opposite and insulated by the diaphragm 2 when the positive electrode sheet 1, the diaphragm 2 and the negative electrode sheet 3 are stacked together, and then the three are wound on the winding needle, and the winding of the core body 10 is formed by rotating the winding needle, and then the battery core is pressed flat by the extrusion device. Since the winding and extrusion processes of the battery core are prior art, the winding and extrusion processes of the battery core will not be described.

[0038] In the existing battery core, the aluminum foil and the copper foil are respectively used as the current collectors of the positive electrode sheet 1 and the negative electrode sheet 3. The longer the electrode sheet, the greater the foil resistance, and the worse the current collection effect, which limits the large current discharge of the battery and weakens the charge-discharge rate performance of the battery.

[0039] To solve the above problems, as shown in Figure 3 The positive electrode sheet 1 is provided with a first empty foil 13 extending out of the core body 10 and being a non-tab welding area, and the negative electrode sheet 3 is provided with a second empty foil 33 extending out of the core body 10 and being a non-tab welding area. The first empty foils 13 of each layer in the core body 10 are welded together, and the second empty foils 33 of each layer in the core body 10 are welded together. By providing the first empty foil 13 as a non-tab welding area on the positive electrode sheet 1 and the second empty foil 33 as a non-tab welding area on the negative electrode sheet 3, and by welding the first empty foils 13 of each layer in the core body 10 together and welding the second empty foils 33 of each layer in the core body 10 together, the contact area of the non-tab position of the positive electrode sheet 1 and the contact area of the non-tab position of the negative electrode sheet 3 are increased, the internal resistance of the battery core is reduced, and the charge-discharge rate of the battery prepared by the battery core is improved.

[0040] Specifically, the core body 10 extends outward at one end in the axial direction and is provided with a positive tab 4 and a negative tab 5, and the core body 10 extends outward at the other end in the axial direction and is provided with a first empty foil 13 and a second empty foil 33. The upper end of the core body 10 is provided with the positive tab 4 and the negative tab 5, and the lower end of the core body 10 is provided with the first empty foil 13 and the second empty foil 33, so that the empty foils and the tabs are respectively arranged at the two ends of the core body 10 in the axial direction, and interference between the empty foils and the tabs is avoided.

[0041] As shown in Figure 1 and Figure 2 The positive electrode sheet 1 is provided with at least two first empty foils 13 on one side in the width direction, and the at least two first empty foils 13 are arranged at intervals along the length direction of the positive electrode sheet 1. The negative electrode sheet 3 is provided with at least two second empty foils 33 on one side in the width direction, and the at least two second empty foils 33 are arranged at intervals along the length direction of the negative electrode sheet 3. In the core body 10, each layer of the core has two empty foils in the thickness direction of the core body 10, and the two empty foils are arranged at intervals along the length direction of the core. Figure 6The first empty foil 13 and the two second empty foils 33 are arranged in the thickness direction of the core body 10.

[0042] As shown in Figure 4 , the first empty foils 13 of each layer of the core are arranged in the thickness direction of the core body 10, so that at least two first empty foils 13 are welded together to increase the contact area of the non-tab position of the positive plate 1, thereby reducing the internal resistance of the core body 10. Figure 5 As shown in Figure 5 , the second empty foils 33 of each layer of the core are arranged in the thickness direction of the core body 10, so that at least two second empty foils 33 are welded together to increase the contact area of the non-tab position of the negative plate 3, thereby reducing the internal resistance of the core body 10.

[0043] It should be noted that as the number of layers of the battery core increases, the length of each layer of the core becomes larger, in order to ensure that all the first empty foils 13 are arranged in the thickness direction of the core body 10 and all the second empty foils 33 are arranged in the thickness direction of the core body 10, the spacing between adjacent three first empty foils 13 gradually increases in the length direction of the positive plate 1, and the spacing between adjacent three second empty foils 33 gradually increases in the length direction of the negative plate 3. The spacing between adjacent three first empty foils 13 and the spacing between adjacent three second empty foils 33 need to be flexibly set according to the actual size of the battery core, which is not specifically limited here.

[0044] As shown in Figures 1 to 3 , the length H1 of the first empty foil 13 extending out of the core body 10 is 3mm-4mm. The length H2 of the second empty foil 33 extending out of the core body 10 is 3mm-4mm. Among them, the length H1 in the up-down direction of the figure can be 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm or 4mm, etc. The length H2 in the up-down direction of the figure can be 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm or 4mm, etc. By setting the length H1 and H2 to the above values, the first empty foil 13 and the second empty foil 33 have a suitable length to ensure that the positive plate 1 has sufficient contact area at the non-tab position and the negative plate 3 has sufficient contact area at the non-tab position. When the length H1 and the length H2 are less than 3mm, the length of the first empty foil 13 and the second empty foil 33 is smaller, which not only reduces the contact area of the positive plate 1 and the contact area of the negative plate 3, but also needs to use auxiliary fixtures to clamp and position the first empty foil 13 and the second empty foil 33 for welding operation, which reduces the welding efficiency of the battery core. If the length H1 and the length H2 are greater than 4mm, the overall length of the battery core in the axial direction is increased, which is not conducive to the miniaturization design of the battery.

[0045] As shown in Figure 3 and Figure 6As shown, the battery roll core further comprises an insulating piece 6, the outer surface of the first empty foil 13 connected by welding is wrapped with the insulating piece 6, and the outer surface of the second empty foil 33 connected by welding is wrapped with the insulating piece 6. By arranging the insulating piece 6, short circuit of the first empty foil 13 and the second empty foil 33 is avoided, and the safety of the battery roll core is improved.

[0046] Specifically, the insulating piece 6 is an insulating tape. When the first empty foil 13 and the second empty foil 33 are respectively completed with the welding operation, the first empty foil 13 and the second empty foil 33 extending out of the roll core body 10 are respectively completely wrapped by winding the insulating tape, so as to ensure good insulation performance of the first empty foil 13 and the second empty foil 33, and improve the safety of the battery roll core. It should be noted that the insulating tape is a high-temperature-resistant tape commonly used in the battery field. Figure 3 Part of the first empty foil 13 and part of the second empty foil 33 extend out of the insulating tape, only for showing the positions of the first empty foil 13 and the second empty foil 33 in the roll core body 10. In the actual processing process, for example, Figure 6 As shown, the first empty foil 13 and the second empty foil 33 extending out of the roll core body 10 are completely covered and wrapped by the corresponding insulating tapes.

[0047] In the embodiment, the battery roll core further comprises an end tape (not shown in the figure), which is pasted on the outermost roll core of the roll core body 10, so as to roll and fix the roll core body 10. By arranging the end tape, the roll core body 10 is prevented from being scattered after being formed, and the stability of the structure of the roll core body 10 is ensured.

[0048] The battery of the embodiment comprises the above-mentioned battery roll core. By increasing the contact area of the non-tab position of the positive plate 1 and the contact area of the non-tab position of the negative plate 3, the internal resistance of the battery roll core is reduced, and the charge-discharge rate of the battery is improved.

[0049] The embodiment further provides a power-using device comprising the above-mentioned battery. By increasing the contact area of the non-tab position of the positive plate 1 and the contact area of the non-tab position of the negative plate 3, the internal resistance of the battery roll core is reduced, and the charge-discharge rate of the battery is improved.

[0050] The above embodiments only illustrate the basic principles and characteristics of the utility model, and the utility model is not limited by the above embodiments. Without departing from the spirit and range of the utility model, the utility model has various changes and changes, and these changes and changes all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A battery jelly-roll, characterized by, The battery roll core comprises a positive electrode sheet (1), a diaphragm (2) and a negative electrode sheet (3), the positive electrode sheet (1), the diaphragm (2) and the negative electrode sheet (3) are stacked and wound to form a roll core body (10); The positive electrode sheet (1) is provided with a first empty foil (12) which extends out of the roll core body (10) and is a non-tab welding area, the negative electrode sheet (3) is provided with a second empty foil (33) which extends out of the roll core body (10) and is a non-tab welding area, the first empty foil (12) of each layer in the roll core body (10) is welded and connected, and the second empty foil (33) of each layer in the roll core body (10) is welded and connected.

2. The jelly-roll battery core according to claim 1, characterized by The roll core body (10) is provided with a positive electrode lug (4) and a negative electrode lug (5) which extend outwardly at one end in the axial direction, and is provided with the first empty foil (12) and the second empty foil (33) which extend outwardly at the other end in the axial direction.

3. The jelly-roll battery core according to claim 2, characterized by The positive electrode sheet (1) is provided with at least two first empty foils (12) on one side in the width direction, and the at least two first empty foils (12) are arranged at intervals along the length direction of the positive electrode sheet (1); the negative electrode sheet (3) is provided with at least two second empty foils (33) on one side in the width direction, and the at least two second empty foils (33) are arranged at intervals along the length direction of the negative electrode sheet (3); In the roll core body (10), each layer of roll core has two first empty foils (12) arranged opposite in the thickness direction of the roll core body (10) and two second empty foils (33) arranged opposite in the thickness direction of the roll core body (10).

4. The jelly-roll battery core according to claim 3, characterized by The interval between adjacent three first empty foils (12) gradually increases along the length direction of the positive electrode sheet (1), and the interval between adjacent three second empty foils (33) gradually increases along the length direction of the negative electrode sheet (3).

5. The jelly-roll battery core according to any one of claims 1 to 4, characterized by The length of the first empty foil (12) extending out of the roll core body (10) is 3mm-4mm; the length of the second empty foil (33) extending out of the roll core body (10) is 3mm-4mm.

6. The jelly-roll battery core according to any one of claims 1 to 4, characterized by The battery roll core further comprises an insulating member (6), the outer surface of the first empty foil (12) welded and connected is wrapped with the insulating member (6), and the outer surface of the second empty foil (33) welded and connected is wrapped with the insulating member (6).

7. The jelly-roll battery core according to claim 6, characterized in that, The insulating member (6) is an insulating tape.

8. The jelly-roll battery core according to any one of claims 1 to 4, characterized by The battery roll core further comprises an end sticking, which is pasted on the outermost layer of the roll core body (10) to fix the winding of the roll core body (10).

9. A battery characterized by The battery roll core comprises the battery roll core according to any one of claims 1-8.

10. An electrical device, characterized by The battery comprises the battery according to claim 9.

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