Battery cell structure, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery core structure, a battery and electric equipment, which comprises a roll core body, a protective shell, an insulating part and a tab connecting part, a placing inner cavity is formed in the protective shell; the insulating part is arranged in the placing inner cavity; a mounting groove is formed in the insulating part; the tab connecting part is arranged in the mounting groove; the roll core body is arranged in the placing inner cavity; a first tab and a second tab are arranged on the roll core body; the second tab is connected to the protective shell; the first tab comprises a first bending section and a first connecting section which are connected in sequence; the first connecting section is connected to the tab connecting part; the first bending section is arranged in the mounting groove in a bending manner; and the projection of the insulating part towards the first bending section is at least partially overlapped with the first bending section. According to the utility model, the use safety and stability of the battery can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a battery core structure, a battery and an electrical equipment using the same. Background Art

[0002] With the rapid development of science and technology, various mobile devices, such as mobile phones, cameras, laptop computers, portable DVDs, digital cameras, stripe machines, power banks, etc., have begun to penetrate into people's lives and gradually become indispensable necessities in life. With the continuous expansion of the application market of electronic products, there is an increasing demand for high-energy batteries. In most existing high-energy batteries, the internal structure of the steel shell battery core is such that the negative electrode tab of the bare battery core is welded to the shell, and the positive electrode tab is welded to the connecting piece at the positive electrode post position of the shell.

[0003] However, in the structure of the existing technology, the welding position of the positive electrode tab of the bare battery core leaks out the tab metal aluminum after the bare battery core is put into the shell; and the leaked tab metal aluminum is likely to come into contact with the shell, so that the battery core will short-circuit, thus greatly reducing the safety and stability of use. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery core structure aiming at the deficiencies of the existing technology, which can solve the technical problems of low safety and stability in the use of the existing technology.

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

[0006] A battery core structure includes a wound core body, a protective shell, an insulating component and an ear connection component; a placement cavity is arranged in the protective shell; the insulating component is arranged in the placement cavity; and an installation groove is arranged in the insulating component; the ear connection component is arranged in the installation groove; the wound core body is arranged in the placement cavity; and a first ear and a second ear are arranged on the wound core body; the second ear is connected to the protective shell; the first ear includes a first bending section and a first connection section which are connected in sequence; the first connection section is connected to the ear connection component; the first bending section is bent and arranged inside the installation groove; and the projection of the insulating component towards the first bending section at least partially coincides with the first bending section.

[0007] Preferably, the projection of the insulating component towards the first bending section completely coincides with the first bending section;

[0008] And / or, the insulating component includes an insulating main board and insulating side edges surrounding and connecting to the side end of the insulating main board; and the installation groove is formed between the insulating main board and the insulating side edges.

[0009] Preferably, a first insulating coating is provided on the first tab; the first insulating coating is disposed to cover the outer surface of the first bent section;

[0010] And the first insulating coating is disposed to cover at most a part of the first connecting section.

[0011] Preferably, when the first tab and the tab connecting component are in an assembled state, the relationship between the height x of the first connecting section and the height f of the tab connecting component satisfies: x < f.

[0012] Preferably, when the first tab and the tab connecting component are in an assembled state, the relationship among the height f of the tab connecting component, the distance g between one end of the first bent section connected to the core body and the bottom of the core body, the height d of the placement cavity, and the height z of the first tab exposed from the core body satisfies: 2f - g ≤ z ≤ 2d - g.

[0013] Preferably, when the first tab and the tab connecting component are in an assembled state, the relationship among the height f of the tab connecting component, the distance g between one end of the first bent section connected to the core body and the bottom of the core body, the height e of the insulating component, and the height z of the first tab exposed from the core body satisfies: 2f - g ≤ z ≤ 2e - g.

[0014] Preferably, the relationship among the height f of the tab connecting component, the height e of the insulating component, the height d of the placement cavity, and the depth b of the bottom of the tab connecting component from the inner bottom of the protective case satisfies: f < e < d, b > 0.

[0015] Preferably, the second tab includes a second bent section and a second connecting section connected in sequence; the second connecting section is connected to the protective case; one end of the second bent section is connected to the core body;

[0016] And a second insulating coating is disposed to cover the outer surface of the second bent section.

[0017] The present utility model also discloses a battery, including the cell structure described above.

[0018] The present utility model also discloses an electrical device, including the battery described above.

[0019] The beneficial effects of the present utility model are as follows. By using an insulating component to separate the tab connecting component from the protective case in this technical solution, the direct contact between the first tab and the second tab is avoided, thus preventing short - circuit problems and improving the safety and stability of use. At the same time, the first connecting section is hidden in the installation groove, and the first bending section is also hidden in the installation groove as much as possible, which can reduce the exposed part of the first tab, thereby reducing the possibility of contact between the first bending section and the case, and further avoiding short - circuits, thus improving the safety and stability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following will refer to the attached Figures 1 to 6 drawings to describe the features, advantages and technical effects of the exemplary embodiments of the present utility model.

[0021] Figure 1 FIG. 11 is a schematic diagram of the overall structure of the cell structure according to an embodiment of the present utility model;

[0022] Figure 2 FIG. 15 is a schematic exploded view of the cell structure according to an embodiment of the present utility model;

[0023] Figure 3 FIG. 19 is a schematic exploded view of the cell structure according to an embodiment of the present utility model;

[0024] Figure 4 FIG. 23 is a schematic unfolded view of the winding core body of the cell structure according to an embodiment of the present utility model;

[0025] Figure 5 FIG. 27 is a schematic diagram of the winding core body of the cell structure according to an embodiment of the present utility model;

[0026] Figure 6 FIG. 31 is a partial enlarged view of the overall state of the cell structure according to an embodiment of the present utility model.

[0027] In the figures: 100 - winding core body; 110 - first electrode tab; 120 - separator; 130 - second electrode tab; 101 - first tab; 102 - second tab; 103 - first bending section; 104 - first connecting section; 105 - first insulating coating; 106 - second insulating coating; 107 - second bending section; 108 - second connecting section; 200 - protective case; 201 - placement cavity; 202 - cover plate; 203 - main case; 210 - insulating component; 211 - installation groove; 212 - insulating main board; 213 - insulating side; 220 - tab connecting component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0029] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically and clearly defined.

[0030] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and there are multiple separate situations. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0032] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0033] The following is a further detailed description of the present utility model in conjunction with the attached Figures 1 to 6 but it is not a limitation to the present utility model.

[0034] Such as Figure 1 and 2As shown, in an embodiment of the present utility model, the battery cell structure includes a winding core body 100, a protective case 200, an insulating component 210, and an electrode tab connecting component 220. The protective case 200 is provided with a placement cavity 201 inside. The insulating component 210 is arranged inside the placement cavity 201. And an installation groove 211 is provided inside the insulating component 210. The electrode tab connecting component 220 is arranged inside the installation groove 211. The winding core body 100 is arranged inside the placement cavity 201. And a first electrode tab 101 and a second electrode tab 102 are provided on the winding core body 100. The second electrode tab 102 is connected to the protective case 200. The first electrode tab 101 includes a first bending section 103 and a first connecting section 104 connected in sequence. The first connecting section 104 is connected to the electrode tab connecting component 220. At least part of the first bending section 103 is bent and arranged inside the installation groove 211. And the projection of the insulating component 210 towards the first bending section 103 at least partially coincides with the first bending section 103. Among them, in some embodiments, such as Figure 1 As shown, the insulating component 210 is connected to the inner side wall of the protective case 200. The electrode tab connecting component 220 is connected to the inner wall of the insulating component 210. Among them, the electrode tab connecting component 220 can be a metal electrode tab connecting piece, etc.

[0035] The technical solution of the present utility model separates the electrode tab connecting component from the protective case by using an insulating component, thereby avoiding the short - circuit problem caused by the direct contact between the first electrode tab and the second electrode tab, thus improving the safety and stability of use. At the same time, the first connecting section is hidden in the installation groove, and the first bending section is hidden in the installation groove as much as possible, which can reduce the exposed part of the first electrode tab, thereby reducing the possibility of contact between the first bending section and the housing, and further avoiding short - circuit, thus improving the safety and stability of use.

[0036] Among them, in some embodiments, such as Figure 1 As shown, the protective case 200 includes a cover plate 202 and a main housing 203 arranged side by side. And the placement cavity 201 is formed between the cover plate 202 and the main housing 203.

[0037] Specifically, in some embodiments, such as Figure 1 As shown, the projection of the insulating component 210 towards the first bending section 103 completely coincides with the first bending section 103. That is to say, by the completely covering setting of the insulating component 210 on the first electrode tab 101 in the width direction, the possibility of contact between the first bending section 103 and the protective case 200 can be reduced, which is beneficial to reducing the risk of short - circuit and improving the safety and stability of the battery cell structure in use.

[0038] Specifically, in some embodiments, such as Figure 1 and 2As shown, a first insulating covering 105 is provided on the first tab 101; the first insulating covering 105 is wrapped around the outer surface of the first bending section 103; and the first insulating covering 105 is at most partially wrapped around the first connecting section 104. Among them, in some embodiments, the side surface of the first connecting section 104 is entirely connected to the tab connecting component 220; the first insulating covering 105 completely wraps the outer surface of the first bending section 103. Further, the first insulating covering 105 is a first insulating (tab) glue. That is to say, the first connecting section 104 is completely hidden inside the installation groove 211; the first bending section 103 with the first insulating covering 105 is exposed in the placement cavity 201, so as to ensure the smoothness and safety of the use of the first tab 101, and can effectively separate the first bending section 103 from the protective shell 200, and if the bare battery cell is tested later, the contact between the first tab 101 and the protective shell 200 will also be the first insulating covering 105 (the tab glue part); thus further avoiding the short-circuit problem caused by the direct contact between the first tab and the second tab, and further improving the safety and stability of use.

[0039] Among them, in some embodiments, the insulating component 210 can be one of insulating paint, insulating glue, insulating paper, insulating fiber products, plastics, rubber, etc.; the tab connecting component 220 is a metal connecting piece.

[0040] Specifically, in some embodiments, as Figure 1 shown, the insulating component 210 includes an insulating main board 212 and an insulating side edge 213 surrounding and connecting to the side end of the insulating main board 212; and the installation groove 211 is formed between the insulating main board 212 and the insulating side edge 213. With this structure of the insulating component 210 having an annular structure and an inverted U-shaped cross-section, it is possible to achieve a surrounding coverage of the first connecting section 103 and the first bending section, thereby reducing the phenomenon of the first bending section 102 extending and being exposed, resulting in contact with the protective shell 200, and thus further avoiding the short-circuit problem caused by the direct contact between the first tab and the second tab, and further improving the safety and stability of use.

[0041] Specifically, in some embodiments, as Figure 1 and 3As shown, when the first tab 101 and the tab connecting component 220 are in the assembled state, the relationship between the height x of the first connecting section 104 and the height f of the tab connecting component 220 satisfies: x < f. That is to say, the installation groove 211 completely covers and hides the first connecting section 104, which can prevent the first connecting section 104 without the first insulating coating 105 (tab glue part) from being exposed and causing a short circuit; thus, when testing the bare battery cell later, the contact between the first tab 101 and the protective case 200 will also be the first insulating coating 105 (tab glue part); therefore, it further avoids the direct contact between the first tab and the second tab from causing a short circuit problem, thereby improving the safety and stability of use.

[0042] Specifically, in some embodiments, such as Figure 1 and 3 As shown in and 6, when the first tab 101 and the tab connecting component 220 are in the assembled state, the relationship between the height f of the tab connecting component 220, the distance g between one end of the first bending section 103 connected to the core body 100 and the bottom of the core body 100, the height d of the placement cavity 201, and the height z of the first tab 101 exposed from the core body 100 satisfies: 2f - g ≤ Z ≤ 2d - g. That is, as Figure 3 and 4 shown, the height z of the first tab 101 exposed from the core body 100 is the sum of the height y of the first bending section 103 and the height x of the first connecting section 104. That is to say, the relationship satisfies: x < f, 2f - g ≤ Z ≤ 2d - g. This structure can effectively prevent the first tab 101 from directly or indirectly contacting the protective case 200, thereby further avoiding the direct contact between the first tab and the second tab from causing a short circuit problem, and then improving the safety and stability of use. Among them, if Z < 2f - g, it is difficult to operate the core body 100 in the process of inserting it into the protective case 200, and there is a risk of being unable to bend it into the protective case 200. If Z > 2d - g, the first tab 101 will push up the cover plate 202 after entering the protective case 200, resulting in a significant increase in the welding defect rate in the subsequent welding process of the case and the cover plate, affecting production.

[0043] Specifically, in some embodiments, such as Figure 1 and 3 As shown in and 6, when the first tab 101 and the tab connecting component 220 are in the assembled state, the relationship between the height f of the tab connecting component 220, the distance g between one end of the first bending section 103 connected to the core body 100 and the bottom of the core body 100, the height e of the insulating component 210, and the height z of the first tab 101 exposed from the core body 100 satisfies: 2f - g ≤ Z ≤ 2e - g. That is, as Figure 3 and 4As shown, the height z of the first tab 101 exposed from the core body 100 is the sum of the height y of the first bending section 103 and the height x of the first connecting section 104. That is to say, the relational expression satisfies: x < f, 2f - g ≤ Z ≤ 2e - g. After the first tab 101 enters the protective case 200, this structure is located below the protective case 200 and the leading-out part of the insulating component 210; and the entire first bending section 103 is covered by the first insulating covering 105, so that the first insulating covering 105 is closest to the cover plate 202 in the thickness direction, that is, it plays an insulating and protective role, thereby further reducing the risk. When x ≥ f, after the first tab 101 enters the protective case 200, there is an exposed metal part on the first bending section 103, which may lead to the risk of short-circuit failure when contacting the case cover later.

[0044] Specifically, in some embodiments, as Figures 1 to 3 shown in FIGS. 5 and 6, the relationship between the height f of the tab connecting component 220, the height e of the insulating component 210, the height d of the placement cavity 201, and the depth b of the bottom of the tab connecting component 220 from the inner bottom of the protective case 200 satisfies: f < e < d, b > 0. Among them, as Figure 3 shown in FIG. 6, the distance between the bottom of the first connecting section 104 and the inner bottom of the installation groove 211 is c, and c > 0. Among them, as Figure 3 shown in FIG. 7, the distance between the outer bottom of the insulating component 210 and the inner bottom of the protective case 200 is a, and a > 0. This structure can help ensure the separation and insulation between the tab connecting component 200 and the insulating component 210, ensure the installation stability of the first tab 101, and avoid the short-circuit risk during the use of the battery cell.

[0045] Specifically, in some embodiments, as Figure 4 shown in FIGS. 13 and 14, the core body 100 includes a first electrode tab 110, a separator 120, and a second electrode tab 130 that are sequentially stacked and wound; and the first tab 101 is disposed on the first electrode tab 110 (in the first tab groove); the second tab 102 is disposed on the second electrode tab 130 (in the second tab groove). Among them, as Figure 4 and 5 shown in FIGS. 16 and 17, the second tab 102 includes a second bending section 107 and a second connecting section 108 that are sequentially connected; the second connecting section 108 is connected to the protective case 200 (the cover plate 202 therein); one end of the second bending section 107 is connected to the second electrode tab 130; and the outer surface of the second bending section 107 is covered with a second insulating covering 106. Further, the second insulating covering 106 is a second insulating (tab) glue.

[0046] Specifically, in some embodiments, as Figure 4As shown, the relationship between the width L1 of the first electrode tab 110, the width L2 of the second electrode tab 130, and the width L3 of the separator 120 satisfies: L1 < L2 < L3. This structure is beneficial for buffering or avoiding the lithium plating phenomenon of the battery cell structure, thereby improving the safety and stability of use.

[0047] Among them, in some embodiments, the first electrode tab 110 is a cathode tab; the second electrode tab 130 is an anode tab; the first tab 101 is a cathode tab; the second tab 102 is an anode tab. Or, the first electrode tab 110 is an anode tab; the second electrode tab 130 is a cathode tab; the first tab 101 is an anode tab; the second tab 102 is a cathode tab. Preferably, the first electrode tab 110 is a cathode tab; the second electrode tab 130 is an anode tab; the first tab 101 is a cathode tab; the second tab 102 is an anode tab.

[0048] Example 1

[0049] For the bare battery cell, the distance z from the top of the first tab (cathode tab) to the edge of the separator is set to satisfy: 2e - g < Z ≤ 2d - g; and the length x of the first connection segment (metal segment) is set to satisfy: x < f; then the production yield of the battery cells in batches and the number of short circuits in the directional drop test under this condition are detected. (As shown in Table 1 below)

[0050] Example 2

[0051] The difference from Example 1 is that: x < f and 2e - g < z ≤ 2d - g.

[0052] Comparative Example 1

[0053] The difference from Example 1 is that: x ≥ f and 2f - g ≤ z ≤ 2d - g.

[0054] Comparative Example 2

[0055] The difference from Example 1 is that: x < f and z < 2f - g.

[0056] Comparative Example 3

[0057] The difference from Example 1 is that: x < f and z > 2d - g.

[0058] Table 1

[0059]

[0060]

[0061] It can be known therefrom that when x < f, 2f - g ≤ Z ≤ 2d - g; and preferably x < f, 2f - g ≤ Z ≤ 2e - g; it can pass through the first tab 101 and be located below the lead-out parts of the protective case 200 and the insulating member 210 after entering the protective case 200; and the entire first bending section 103 is covered by the first insulating coating member 105, so that the first insulating coating member 105 is closest to the cover plate 202 in the thickness direction, that is, it plays an insulating and protective role, thereby further reducing the risk.

[0062] The present invention also provides a battery, which includes a battery cell structure. The specific structure of the battery cell structure refers to the above embodiments. Since this battery adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described in detail herein one by one.

[0063] The present invention also provides an electrical device, which includes a battery. The specific structure of the battery refers to the above embodiments. Since this electrical device adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described in detail herein one by one.

[0064] Among them, the electrical device can 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 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc. The embodiments of the present application do not make special restrictions on the above electrical devices.

[0065] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0066] Based on the disclosure and teachings of the above specification, those skilled in the art to which the present utility model pertains can also make changes and modifications to the above embodiments. Therefore, the present utility model is not limited to the above specific embodiments, and any obvious improvements, substitutions or variations made by those skilled in the art based on the present utility model all fall within the protection scope of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims

1. A battery cell structure, characterized in that: It includes a core body, a protective case, an insulating component, and an ear connection component; a placement cavity is provided inside the protective case; the insulating component is arranged inside the placement cavity; and an installation groove is provided inside the insulating component; the ear connection component is arranged inside the installation groove; the core body is arranged inside the placement cavity; and a first ear and a second ear are provided on the core body; the second ear is connected to the protective case; the first ear includes a first bending section and a first connection section connected in sequence; the first connection section is connected to the ear connection component; the first bending section is bent and arranged inside the installation groove; and the projection of the insulating component towards the first bending section at least partially coincides with the first bending section.

2. The cell structure according to claim 1, wherein: The projection of the insulating component towards the first bending section completely coincides with the first bending section. And / or, the insulating component includes an insulating main board and insulating side edges connected around the side ends of the insulating main board; and the installation groove is formed between the insulating main board and the insulating side edges.

3. The cell structure according to claim 1, wherein: A first insulating coating is provided on the first ear; the first insulating coating is coated on the outer surface of the first bending section. And the first insulating coating is coated on at most a part of the first connection section.

4. The cell structure according to claim 1, wherein: When the first ear and the ear connection component are in an assembled state, the relationship between the height x of the first connection section and the height f of the ear connection component satisfies: x < f.

5. The cell structure according to claim 4, wherein: When the first ear and the ear connection component are in an assembled state, the relationship between the height f of the ear connection component, the distance g between one end of the first bending section connected to the core body and the bottom of the core body, the height d of the placement cavity, and the height z of the first ear exposed from the core body satisfies: 2f - g ≤ z ≤ 2d - g.

6. The cell structure according to claim 4, wherein: When the first ear and the ear connection component are in an assembled state, the relationship between the height f of the ear connection component, the distance g between one end of the first bending section connected to the core body and the bottom of the core body, the height e of the insulating component, and the height z of the first ear exposed from the core body satisfies: 2f - g ≤ z ≤ 2e - g.

7. The cell structure according to any one of claims 4 to 6, characterized in that: The relationship between the height f of the ear connection component, the height e of the insulating component, the height d of the placement cavity, and the depth b of the bottom of the ear connection component from the inner bottom of the protective case satisfies: f < e < d, b > 0.

8. The cell structure according to claim 1, characterized in that: The second ear includes a second bending section and a second connection section connected in sequence; the second connection section is connected to the protective case; one end of the second bending section is connected to the core body. And a second insulating coating is coated on the outer surface of the second bending section.

9. A battery, characterized in that: It includes the battery cell structure according to any one of claims 1 to 8.

10. An electrical equipment, characterized in that: It includes the battery according to claim 9.

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