Battery structure and electric equipment

Abstract

The utility model provides a battery structure and electric equipment, the battery structure comprises a roll core and a support cushion block, the roll core is provided with a central hole; the supporting cushion block is arranged at the center hole to provide supporting acting force for the roll core. The utility model solves the problems that in the prior art, the roll core needs to be subjected to hot-press shaping after winding, the corner of an inner ring pole piece is folded at a large angle due to hot pressing, serious cracks, material falling and even breakage are generated on the folded inner side and outer side of the inner layer pole piece, the folded inner ring pole piece is not tightly attached, and the inner ring pole piece is not tightly attached to the inner layer pole piece. And the electrical performance and the safety performance of the battery are seriously threatened.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, specifically, relate to a battery structure and electric equipment. BACKGROUND

[0002] Lithium ion battery is a kind of high energy density, long life, portable, environmental protection rechargeable battery, is widely used in electronic equipment, automobile, energy storage system and other fields.Lithium ion battery can be divided into three categories according to shell, respectively, soft package battery, aluminum shell battery, steel shell battery.Among them, aluminum shell battery and steel shell battery include metal shell and cover plate, and the inside of aluminum shell battery and steel shell battery is the elliptical or circular roll core formed by the winding of pole piece and diaphragm by winding needle, and the appearance is square after forming,

[0003] However, there is a center hole left by the extraction of winding needle in the middle, and the roll core needs to be heat pressed after winding, and the heat pressing will cause the large-angle folding of the corner of the inner circle pole piece, and the inside and outside of the inner layer pole piece are seriously cracked, material is dropped, and even the piece is broken, and the inner circle pole piece is not closely attached after folding, which seriously threatens the electrical performance and safety performance of the battery. SUMMARY

[0004] The main purpose of the utility model is to provide a kind of battery structure and electric equipment, to solve the problem that the roll core needs to be heat pressed after winding in the prior art, and the heat pressing will cause the large-angle folding of the corner of the inner circle pole piece, and the inside and outside of the inner layer pole piece are seriously cracked, material is dropped, and even the piece is broken, and the inner circle pole piece is not closely attached after folding, which seriously threatens the electrical performance and safety performance of the battery.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a kind of battery structure is provided, including roll core and support pad block, wherein, roll core has center hole;Support pad block is set at center hole, to provide support force for roll core.

[0006] Further, the support pad block is an insulating pad block.

[0007] Further, in the axial direction of the roll core, the cross-sectional shape of the hole section of the center hole is adapted to the cross-sectional shape of the cross section of the support pad block.

[0008] Further, the hole section of the center hole is in a strip shape, the cross section of the support pad block is in a strip shape, and the edge corner of the strip-shaped support pad block is smoothly transitioned.

[0009] Further, the thickness of the strip-shaped support pad block in the radial direction of the roll core is K, wherein 0.1mm≤K≤0.3mm.

[0010] Further, a length L of the long strip-shaped support pad in the axial direction of the winding core, and a first width D of the negative electrode tab of the winding core in the axial direction of the winding core satisfy: L≤D.

[0011] Further, a second width W of the long strip-shaped support pad, a thickness K of the long strip-shaped support pad, and a circumference C of the winding needle extracted from the center hole of the winding core satisfy: W=(C-2×K) / 2, and the unit of the second width W is mm.

[0012] Further, the hole section of the center hole is circular, the cross section of the support pad is square, and the corners of the square-shaped support pad are smoothly transitioned; or, the hole section of the center hole is circular, the cross section of the support pad is circular, and the center hole is provided with a gap between the hole wall surface and the outer circumferential surface of the support pad.

[0013] Further, the winding core sequentially comprises the negative electrode tab, the diaphragm, the positive electrode tab, and the negative electrode tab from inside to outside.

[0014] According to another aspect of the present application, a kind of power utilization equipment is provided, including the battery structure described above.

[0015] The technical scheme of the present application provides a kind of battery structure, including winding core and support pad, wherein, winding core has center hole;Support pad is set at center hole, to provide support force for winding core.Just like this, the setting of support pad makes the stress of the most inner layer corner of winding core after heat pressing electrode piece reduces. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of this application serve to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute undue limitation on the present application.In the drawings:

[0017] Figure 1 The structure schematic view of winding core and support pad of the battery structure according to an alternative embodiment of the present application is shown;

[0018] Figure 2 The structure schematic view of the negative electrode tab of winding core in Figure 1 is shown;

[0019] Figure 3 The structure schematic view of support pad in Figure 1 is shown.

[0020] Among them, the above-mentioned drawings include the following reference signs:

[0021] 10, winding core;11, center hole;12, negative electrode tab;121, positive electrode lug;122, negative electrode lug;

[0022] 20, support pad. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] In order to solve the problem that the winding core needs to be heat-pressed after winding in the prior art, the heat-pressing will cause large-angle folding at the corner of the inner ring pole piece, and serious cracks and material falling off will occur on the inner side and the outer side of the folded inner layer pole piece, and even the pole piece will be broken, and the inner ring pole piece is not tightly attached after folding, which seriously threatens the electrical performance and safety performance of the battery. The present application provides a battery structure and an electric equipment, wherein the electric equipment comprises the above and the following battery structure.

[0025] As shown in Figures 1 to 3 The battery structure comprises a winding core 10 and a support pad 20, wherein the winding core 10 has a center hole 11; the support pad 20 is arranged at the center hole 11 to provide a supporting force for the winding core 10.

[0026] The technical scheme of the present application provides a battery structure, comprising a winding core 10 and a support pad 20, wherein the winding core 10 has a center hole 11; the support pad 20 is arranged at the center hole 11 to provide a supporting force for the winding core 10. In this way, the arrangement of the support pad 20 reduces the stress on the pole piece at the corner of the innermost layer of the winding core 10 after heat-pressing.

[0027] Further, the winding core 10 comprises, in sequence from inside to outside, a negative pole piece 12, a diaphragm, a positive pole piece, and a negative pole piece 12. In this way, the arrangement of the support pad 20 reduces the stress on the negative pole piece 12 at the corner of the innermost layer of the winding core 10 after heat-pressing, ensures the integrity of the interface of the positive pole piece, and ensures the integrity of the interface of the negative pole piece 12, which is beneficial to prevent material falling off at the corner of the negative pole piece 12, thereby preventing the risk of short circuit of the negative pole piece 12, and the corner of the winding core 10 is tightly attached by adding the support pad 20, thereby preventing the occurrence of the risk of lithium precipitation.

[0028] It should be noted that, in the present application, the support pad 20 is an insulating pad. In this way, it is beneficial to prevent the risk of short circuit caused by the addition of the support pad 20.

[0029] It should be noted that in the present application, the support pad 20 is always arranged at the center hole 11 so as to provide a supporting force during hot pressing and to support the interface integrity of the negative electrode sheet 12 after hot pressing, thereby improving the rate capability, cycle performance and safety performance of the battery structure.

[0030] Optionally, the support pad 20 is a PP pad, or the support pad 20 is a PE pad.

[0031] It should be noted that in the present application, in the axial direction of the roll core 10, the cross-sectional shape of the hole section of the center hole 11 is adapted to the cross-sectional shape of the cross section of the support pad 20. In this way, it is ensured that the support pad 20 can provide a stable supporting force to the corner of the negative electrode sheet 12 as much as possible.

[0032] As shown in Figure 1 , the hole section of the center hole 11 is in a strip shape, the cross section of the support pad 20 is in a strip shape, and the corner of the support pad 20 in a strip shape is smoothly transitioned. In this way, by setting the corner of the support pad 20 in a strip shape to be smoothly transitioned, i.e., rounding the corner of the support pad 20, the inner circumferential surface of the negative electrode sheet 12 is prevented from being scratched.

[0033] As shown in Figure 1 , the thickness K of the support pad 20 in a strip shape in the radial direction of the roll core 10 is 0.1mm≤K≤0.3mm. In this way, by reasonably optimizing the thickness K of the support pad 20 in a strip shape in the radial direction of the roll core 10, it is prevented that the support pad 20 in a strip shape is difficult to be fitted into the center hole 11 due to the thickness K of the support pad 20 in a strip shape in the radial direction of the roll core 10 being too large, and the inner circumferential surface of the negative electrode sheet 12 is prevented from being scratched due to the thickness K of the support pad 20 in a strip shape in the radial direction of the roll core 10 being too large, and it is also prevented that the roll core 10 cannot be provided with a stable supporting force due to the thickness K of the support pad 20 in a strip shape in the radial direction of the roll core 10 being too small.

[0034] As shown in Figure 2 and Figure 3 , the length L of the support pad 20 in a strip shape in the axial direction of the roll core 10 and the first width D of the negative electrode sheet 12 of the roll core 10 in the axial direction of the roll core 10 satisfy: L≤D. In this way, it is beneficial to prevent the length L of the support pad 20 in the axial direction of the roll core 10 from being located outside the width direction of the negative electrode sheet 12 due to the length L of the support pad 20 in the axial direction of the roll core 10 being greater than the first width D of the negative electrode sheet 12 of the roll core 10 in the axial direction of the roll core 10.

[0035] As shown in Figure 1 and Figure 3As shown, the second width W of the long strip-shaped support pad 20, the thickness K of the long strip-shaped support pad 20, and the circumference C of the roll needle extracted from the center hole 11 of the roll core 10 satisfy the relationship W=(C-2xK) / 2, and the unit of the second width W is mm.

[0036] As shown, the negative electrode tab 12 has a positive electrode lug 121 and a negative electrode lug 122. Figure 2

[0037] It should be noted that in an embodiment of the application not shown in the figure, the hole section of the center hole 11 is circular, the cross section of the support pad 20 is square, and the corners of the square support pad 20 are smoothly transitioned; or, the hole section of the center hole 11 is circular, the cross section of the support pad 20 is circular, and the hole wall of the center hole 11 and the outer circumferential surface of the support pad 20 are arranged with a gap. In this way, the support reliability of the support pad 20 to the roll core 10 is ensured.

[0038] It should be noted that in the present application, by arranging the support pad 20 at the center hole 11 of the roll core 10, the stress on the corner of the innermost layer of the roll core 10 after hot pressing is effectively reduced, the integrity of the interface between the positive and negative electrode tabs is ensured, the dropping phenomenon of the corner of the negative electrode tab 12 is prevented, and the risk of short circuit of the negative electrode tab 12 is prevented, thereby improving the safety performance of the battery structure.

[0039] Further, by arranging the support pad 20 at the center hole 11 of the roll core 10, the close fit of the corner of the roll core 10 can be achieved, and the occurrence of lithium precipitation can be prevented, thereby improving the safety performance of the battery structure.

[0040] Further, by arranging the support pad 20 at the center hole 11 of the roll core 10, it is beneficial to prevent the dropping phenomenon of the negative electrode tab 12, and to reduce the short circuit failure rate of the roll core 10, thereby improving the production efficiency of the battery structure.

[0041] Further, by arranging the support pad 20 at the center hole 11 of the roll core 10, it is beneficial to reduce the rebound phenomenon of the thickness of the roll core 10, thereby facilitating the subsequent shell entry of the roll core 10, and further improving the production efficiency of the battery structure.

[0042] Further, by arranging the support pad 20 at the center hole 11 of the roll core 10, the film forming performance of the surface of the negative electrode tab 12 is better, which is beneficial to improve the cycle performance of the battery structure and the storage performance of the battery structure.

[0043] ​The technical scheme of the utility model provides a battery structure, which comprises a winding core 10 and a supporting cushion block 20, wherein the winding core 10 has a center hole 11; the supporting cushion block 20 is arranged at the center hole 11 to provide a supporting force for the winding core 10. In this way, the arrangement of the supporting cushion block 20 reduces the stress on the tab at the corner of the innermost layer of the winding core 10 after hot pressing.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0045] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application, unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the said techniques, methods and devices should be regarded as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so further discussion is not needed in subsequent drawings.

[0046] For ease of description, spatial relative terms such as "over", "above", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0047] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0048] It should be noted that the terms "first", "second", and the like, herein do not necessarily have an either chronological or spatial relation to each other, but are used merely to distinguish a different single implementation from another unless specifically indicated otherwise. It should be understood that the use of the term "or" in the context of describing example embodiments is used to mean a selection of one or more of the alternatives. For example, the phrase "A / B or C" is satisfied by any one of the following alternatives: [A and B] or [C].

[0049] The preferred embodiments of the present application have been described above with the specific embodiments. The present application is not limited to the above embodiments. It will be appreciated by those skilled in the art that changes can be made to the embodiments described herein, without departing from the spirit and scope of the application. Accordingly, modifications, equivalent replacement, improvements, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A battery structure, characterized by, The battery structure comprises: a winding core (10) having a center hole (11); a support pad (20) arranged at the center hole (11) to provide a supporting force for the winding core (10).

2. The battery structure of claim 1, wherein The support pad (20) is an insulating pad.

3. The battery structure of claim 1, wherein In the axial direction of the winding core (10), the cross-sectional shape of the hole section of the center hole (11) is adapted to the cross-sectional shape of the cross section of the support pad (20).

4. The battery structure of claim 3, wherein The hole section of the center hole (11) is in a strip shape, the cross section of the support pad (20) is in a strip shape, and the corners of the support pad (20) in the strip shape are smoothly transitioned.

5. The battery structure of claim 4, wherein, The thickness of the support pad (20) in the strip shape in the radial direction of the winding core (10) is K, wherein 0.1mm≤K≤0.3mm.

6. The battery structure of claim 4, wherein, The length L of the support pad (20) in the strip shape in the axial direction of the winding core (10), the first width D of the negative electrode tab of the winding core (10) in the axial direction of the winding core (10) satisfy: L≤D.

7. The battery structure of claim 4, wherein The second width W of the support pad (20) in the strip shape, the thickness K of the support pad (20) in the strip shape, and the circumference C of the winding needle extracted from the center hole (11) of the winding core (10) satisfy: W=(C-2×K) / 2, and the unit of the second width W is mm.

8. The battery structure according to claim 3, wherein the hole section of the center hole (11) is in a circular shape, the cross section of the support pad (20) is in a square shape, and the corners of the support pad (20) in the square shape are smoothly transitioned; or the hole section of the center hole (11) is in a circular shape, the cross section of the support pad (20) is in a circular shape, and the center hole (11) and the support pad (20) are arranged with a gap between the hole wall surface of the center hole (11) and the outer circumferential surface of the support pad (20).

9. The battery structure according to any one of claims 1 to 8, characterized by, The winding core (10) comprises, from inside to outside, a negative electrode tab (12), a separator, a positive electrode tab, and a negative electrode tab (12).

10. An electric device, characterized by The battery structure comprises the battery structure according to any one of claims 1 to 9.

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