Battery cell structure, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery cell structure, a battery and electric equipment. The battery cell structure comprises a roll core structure, a shell, at least two first tabs and at least two second tabs, an inner cavity is formed in the shell; the roll core structure is arranged in the inner cavity; all the first tabs are oppositely arranged at the two side ends, on the first base surface, of the roll core structure; one of the first tabs is connected to the shell, and a first gap is formed between the other first tab and the shell; all the second tabs are oppositely arranged at the two side ends, on the second base surface, of the roll core structure; one of the second tabs is connected to the shell, and a second gap is formed between the other second tab and the shell. According to the utility model, the safety and the stability of the battery cell structure can be improved.

Description

Technical Field

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

[0002] Lithium-ion batteries have been widely used in consumer electronics, electric vehicles and other fields, and have made their mark in the field of large-scale energy storage. The market has put forward higher requirements for the energy density, power density, and life of lithium-ion batteries. Lithium-ion batteries are composed of a cell structure and an electrolyte; the cell structure includes a bare cell and a shell.

[0003] However, in some existing battery cell structures, the bare battery cell is in close contact with the shell, and the electrolyte cannot be injected into the shell in a sufficient amount, resulting in insufficient liquid injection and liquid retention in the battery cell, and lithium deposition during battery cycle; and it is easy to cause damage to the bare battery cell when passing the drum test, thereby affecting the safety and stability of the battery cell structure. Utility Model Content

[0004] The purpose of the utility model is to provide a battery core structure to improve the safety and stability of the battery core structure in view of the deficiencies in the prior art.

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

[0006] A battery cell structure comprises a winding core structure, a shell, at least two first pole tabs and at least two second pole tabs; an inner cavity is provided in the shell; the winding core structure is arranged in the inner cavity; all the first pole tabs are arranged relatively at the two side ends of the winding core structure on a first base surface; one of the first pole tabs is connected to the shell, and a first gap is provided between the other first pole tab and the shell; all the second pole tabs are arranged relatively at the two side ends of the second base surface of the winding core structure; one of the second pole tabs is connected to the shell, and a second gap is provided between the other second pole tab and the shell.

[0007] Preferably, the first tab includes a first split body and a second split body; the first gap is formed between the side end of the first split body and the inner side wall of the shell, and the first gap is formed between the side end of the second split body and the inner side wall of the shell; and the top of the first split body and the top of the second split body are respectively connected to the top of the shell;

[0008] And / or, the second pole ear includes a third sub-body and a fourth sub-body; the third sub-body and the fourth sub-body extend respectively along the thickness direction of the core structure and toward the bottom of the shell; and the bottom of the third sub-body is connected to the inner bottom of the shell; the second gap is formed between the fourth sub-body and the inner bottom of the shell.

[0009] Preferably, the thickness L1 of the first split body has a value range of: L1 is 0.04 to 0.20 mm; and / or, the thickness L2 of the second split body has a value range of: L2 is 0.04 mm to 0.80 mm; and / or, the thickness L3 of the third split body has a value range of: L3 is 0.04 to 0.20 mm; and / or, the thickness L4 of the fourth split body has a value range of: L4 is 0.04 mm to 0.80 mm.

[0010] Preferably, the value range of the width L5 of the first gap is: L5 is 0.1 mm to 0.3 mm; and / or the value range of the width L6 of the second gap is: L6 is 0.1 mm to 0.3 mm.

[0011] Preferably, an angle α is set between the plane where the central axis of the first split body is located and the plane where the central axis of the second split body is located, wherein the angle α satisfies: 170°≤α≤190°;

[0012] And / or, an angle β is set between a plane where the central axis of the third sub-body is located and a plane where the central axis of the fourth sub-body is located, wherein the angle β satisfies: 170°≤β≤190°.

[0013] Preferably, an angle θ is set between a plane where the central axis of the first body is located and a plane where the central axis of the third body is located, wherein the angle θ satisfies: 80°≤θ≤100°.

[0014] Preferably, the shell includes a bottom shell and a cover body connected to an opening of the bottom shell; the inner cavity is formed between the cover body and the bottom shell; and the first pole ear is connected to the cover body; and the second pole ear is connected to the inner bottom of the bottom shell.

[0015] Preferably, the winding core structure includes a first pole piece, a second pole piece and an isolation film arranged between the first pole piece and the second pole piece; the first pole piece, the isolation film and the second pole piece are wound in sequence to form a winding structure; and the first pole ear is connected to the outer surface of the outermost layer of the first pole piece; the second pole ear is connected to the second pole piece.

[0016] The utility model also discloses a battery, comprising the battery core structure described above.

[0017] The utility model also discloses an electric device, comprising the battery.

[0018] The beneficial effect of the utility model lies in that the technical solution adopts at least two first pole ears extending in the same side direction and the second pole ears extending in the same side direction, and combines the first gap and the second gap formed thereon, so as to achieve the stability of the assembly of the first pole ear and the second pole ear, effectively accelerate the charging and discharging speed of the battery cell structure, and at the same time, the additional gap can be used to buffer the damage of the external stress to the core structure such as the impact, and the injection amount can be guaranteed, thereby improving the safety and stability of the battery cell structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following will refer to the attached Figures 1 to 5 To describe the features, advantages and technical effects of exemplary embodiments of the present utility model.

[0020] Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of a battery cell according to an embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of a battery cell according to an embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of the utility model;

[0024] Figure 5 It is a top view of a battery core structure according to an embodiment of the present utility model.

[0025] In the figure: 1-winding core structure; 11-first pole piece; 12-second pole piece; 13-isolating membrane; 2-first pole ear; 21-first sub-body; 22-second sub-body; 3-second pole ear; 31-third sub-body; 32-fourth sub-body; 301-vertical connecting section; 302-horizontal connecting section; 4-shell; 401-inner cavity; 402-first gap; 403-second gap; 41-bottom shell; 42-cover body; 421-cover plate; 422-positive pole. DETAILED DESCRIPTION

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments 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.

[0027] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship between a cell structure, a battery, and an electrical device to describe the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and multiple situations exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are an "or" relationship between a cell structure, a battery, and an electrical device.

[0030] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0031] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0032] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0033] The following is combined with Figure 1 to Figure 5 The utility model is further described in detail, but it is not intended to limit the utility model.

[0034] like Figure 1 and 2 As shown, in one embodiment of the utility model, the battery cell structure includes a winding core structure 1, a shell 4, at least two first pole tabs 2 and at least two second pole tabs 3; an inner cavity 401 is provided in the shell 4; the winding core structure 1 is arranged in the inner cavity 401; all the first pole tabs 2 are relatively arranged at the two side ends of the first base surface of the winding core structure 1, and are extended along the same direction; one of the first pole tabs 2 is connected to the shell 4, and a first gap 402 is provided between the other first pole tab 2 and the shell 4; all the second pole tabs 3 are relatively arranged at the two side ends of the second base surface of the winding core structure 1, and are extended along the same direction; one of the second pole tabs 3 is connected to the shell 4, and a second gap 403 is provided between the other second pole tab 3 and the shell 4; wherein the first base surface intersects with the second base surface.

[0035] The technical solution of the utility model adopts at least two first pole ears extending in the same side direction and the second pole ears extending in the same side direction, and combines the first gap and the second gap formed thereon, so that the stability of the assembly of the first pole ear and the second pole ear can be achieved, and the charging and discharging speeds of the battery cell structure can be effectively accelerated. At the same time, the additional gap can be used to buffer the damage of the external stress to the core structure such as the impact, and the injection amount can be guaranteed, thereby improving the safety and stability of the battery cell structure.

[0036] Among them, Figure 1 As shown, the first base plane is the XZ circumferential plane in the length direction; the second base plane is the YZ axis plane in the width direction; and the first base plane is perpendicular to the second base plane. This structure can ensure the coverage length of the first and second pole tabs as much as possible, thereby improving the charging and discharging performance of the winding core structure.

[0037] Specifically, in some embodiments, Figure 1 As shown, the housing 4 includes a bottom shell 41 and a cover 42 connected to the opening of the bottom shell 41; the inner cavity 401 is formed between the cover 42 and the bottom shell 41; and the first pole ear 2 is connected to the cover 42; the second pole ear 3 is connected to the inner bottom of the bottom shell 41. Figure 1As shown, the cover body 42 includes a cover plate 421 and a positive pole column 422 which are stacked on each other; and one of the first pole ears 2 is connected to the positive pole column 422; and the other first pole ear 2 is connected to the cover plate 421. Among them, the first pole ear 2 is a positive pole ear, and the second pole ear 3 is a negative pole ear. That is to say, two different positive pole ears are respectively welded to the cover plate 421 and the positive pole column 422 made of steel buckles; at least one of the second pole ears 3 is welded to the inner bottom of the bottom shell 41. This structure can effectively increase the gap between the positive and negative pole ears and the inner wall of the shell 4 while ensuring the normal operation of the battery structure, so that the degree of mutual compression between the shell 4 and the bare battery cell can reach a reasonable range during the drum test, and the first pole ear or the second pole ear can be prevented from breaking, and the amount of liquid injection can be guaranteed, thereby improving the test and use stability of the structure.

[0038] Specifically, in some embodiments, Figure 1 and 2 As shown, the first pole ear 2 includes a first split body 21 and a second split body 22; the first split body 21 and the second split body 22 are symmetrically arranged at the left and right side ends of the winding core structure 1; and the first gap 402 is formed between the side end of the first split body 21 and the inner side wall of the bottom shell 41, and the first gap 402 is formed between the side end of the second split body 22 and the inner side wall of the bottom shell 41; and the top of the first split body 21 and the top of the second split body 22 are respectively connected to the top of the shell 4 (cover body 42). Among them, the first split body 21 is connected to the positive pole 422, and the second split body 22 is connected to the cover plate 421. Among them, the value range of the thickness L1 of the first split body 21 is: L1 is 0.04-0.20mm; the value range of the thickness L2 of the second split body 22 is: L2 is 0.04mm-0.80mm; the value range of the width L5 of the first gap 402 is: L5 is 0.1mm-0.3mm. That is to say, after the first split body 21 selects a fixed parameter of 0.04 to 0.20 mm, the first gap 402 is adjusted by adjusting the thickness of the second split body 22, which can help increase the internal liquid injection volume and charging efficiency, and ensure that the bare battery cell does not shake excessively during the drum test.

[0039] Specifically, in some embodiments, Figure 4 As shown, an angle α is set between the plane where the central axis of the first split body 21 is located and the plane where the central axis of the second split body 22 is located, wherein the angle α satisfies: 170°≤α≤190°. Preferably, 180° is used. The structure can ensure the stability of the structure and the electrical performance of the battery structure by aligning the first split body 21 and the second split body 22.

[0040] Specifically, in some embodiments, Figure 1 and 3As shown, the second pole lug 3 includes a third body 31 and a fourth body 32; the third body 31 and the fourth body 32 are symmetrically arranged on the front and rear sides of the winding core structure 1; the third body 31 and the fourth body 32 extend toward the bottom of the shell 4 along the thickness direction of the winding core structure 1 respectively; and the bottom of the third body 31 is connected to the inner bottom of the shell 4; the second gap 403 is formed between the fourth body 32 and the inner bottom of the shell 4. Among them, the value range of the thickness L3 of the third body 31 is: L3 is 0.04-0.20mm; the value range of the thickness L4 of the fourth body 32 is: L4 is 0.04mm-0.80mm; the value range of the width L6 of the second gap 403 is: L6 is 0.1mm-0.3mm. That is to say, after the third body 31 is selected to have a fixed parameter of 0.04-0.20 mm, the thickness of the fourth body 32 is adjusted to adjust the second gap 403, which can help to increase the internal liquid injection volume and charging efficiency, and ensure that the bare battery cell will not shake excessively during the drum test. Figure 3 As shown, the third split 31 and the fourth split 32 both include a vertical connecting section 301 and a horizontal connecting section 302 that are interconnected; the vertical connecting section 301 is connected to the inside of the core structure 1; the horizontal connecting section 302 is connected to the inner bottom of the shell 4, or the second gap 403 is formed between the horizontal connecting section 302 and the inner bottom of the shell 4.

[0041] Specifically, in some embodiments, Figure 4 As shown, an angle β is set between the plane where the central axis of the third sub-body 31 is located and the plane where the central axis of the fourth sub-body 32 is located, wherein the angle β satisfies: 170°≤β≤190°. Preferably, 180° is used. The structure can ensure the stability of the structure and the electrical performance of the battery structure by aligning the third sub-body 31 and the fourth sub-body 32.

[0042] Among them, Figure 5 As shown, the first split body 21 is the pole piece a, the second split body 22 is the pole piece c, the third split body 31 is the pole piece b, and the fourth split body 32 is the pole piece d; and when the number and specifications of the pole pieces a and the pole pieces b remain unchanged, adding the number and specifications of the pole pieces c and the pole pieces d can effectively increase the charging rate and the maximum liquid injection amount of the battery cell structure, thereby improving the use efficiency and safety of the battery cell structure.

[0043] Specifically, in some embodiments, Figure 4As shown, the plane where the central axis of the first split body 21 is located and the plane where the central axis of the third split body 31 is located are set with an angle θ, wherein the angle θ satisfies: 80°≤θ≤100°. Among them, 90° is preferred. The vertical arrangement of the first split body 21 and the third split body 31 can improve the orderliness of the arrangement of the battery cell structure, so that the first split body 21 is welded on the head pole; the third split body 31 is welded on the bottom shell of the battery cell.

[0044] Specifically, in some embodiments, Figure 4 As shown, the winding core structure 1 includes a first pole piece 11, a second pole piece 12, and a separation film 13 disposed between the first pole piece 11 and the second pole piece 12; the first pole piece 11, the separation film 13, and the second pole piece 12 are sequentially wound to form a winding structure; and the first pole ear 2 is relatively disposed on the outer surface of the outermost layer of the first pole piece 11; the second pole ear 3 is relatively disposed on the outer surface of the outermost layer of the second pole piece 12. In some embodiments, as Figure 4 As shown, the first pole piece 11 is a positive pole piece, and the first pole lug 2 is a positive pole lug; the second pole piece 12 is a negative pole piece, and the second pole lug 3 is a negative pole lug. In other embodiments (not shown), the first pole piece 11 is a negative pole piece, and the first pole lug 2 is a negative pole lug; the second pole piece 12 is a positive pole piece, and the second pole lug 3 is a negative pole lug.

[0045] The utility model also proposes a battery, which includes a battery cell structure. The specific structure of the battery cell structure refers to the above-mentioned embodiment. Since the battery adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0046] Among them, the battery refers to a cup, trough or other container or part of a composite container that contains electrolyte solution and metal electrodes to generate current, and is a device that can convert chemical energy into electrical energy; the battery has positive and negative electrodes. With the advancement of science and technology, batteries generally refer to small devices that can generate electrical energy, such as solar cells. The performance parameters of batteries mainly include electromotive force, capacity, specific energy and resistance. Battery principle: In chemical batteries, the direct conversion of chemical energy into electrical energy is the result of spontaneous oxidation, reduction and other chemical reactions inside the battery, which are carried out on the two electrodes respectively. The negative electrode active material is composed of a reducing agent with a relatively negative potential and stable in the electrolyte, such as active metals such as zinc, cadmium, and lead, and hydrogen or hydrocarbons. The positive electrode active material is composed of an oxidizing agent with a relatively positive potential and stable in the electrolyte, such as metal oxides such as manganese dioxide, lead dioxide, and nickel oxide, oxygen or air, halogens and their salts, oxygen-containing acids and their salts, etc. The electrolyte is a material with good ionic conductivity, such as an aqueous solution of acid, alkali, or salt, an organic or inorganic non-aqueous solution, a molten salt, or a solid electrolyte.

[0047] The utility model also proposes an electrical device, which includes a battery. The specific structure of the battery refers to the above embodiment. Since the electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0048] Among them, the electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical equipment.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0050] 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 cell structure, characterized in that: It includes a winding core structure, a shell, at least two first pole ears and at least two second pole ears; an inner cavity is provided in the shell; the winding core structure is arranged in the inner cavity; all the first pole ears are relatively arranged at the two side ends of the first base surface of the winding core structure; one of the first pole ears is connected to the shell, and a first gap is provided between the other first pole ear and the shell; all the second pole ears are relatively arranged at the two side ends of the second base surface of the winding core structure; one of the second pole ears is connected to the shell, and a second gap is provided between the other second pole ear and the shell.

2. The battery cell structure according to claim 1, characterized in that: The first electrode tab includes a first split body and a second split body; the first gap is formed between the side end of the first split body and the inner side wall of the shell, and the first gap is formed between the side end of the second split body and the inner side wall of the shell; and the top of the first split body and the top of the second split body are respectively connected to the top of the shell; And / or, the second electrode tab includes a third sub-body and a fourth sub-body; The third sub-body and the fourth sub-body respectively extend along the thickness direction of the winding core structure and toward the bottom of the shell; and the bottom of the third split body is connected to the inner bottom of the shell; The second gap is formed between the fourth split body and the inner bottom of the shell.

3. The battery cell structure according to claim 2, characterized in that: The thickness L1 of the first split body has a value range of: L1 is 0.04 to 0.20 mm; and / or, the thickness L2 of the second split body has a value range of: L2 is 0.04 to 0.80 mm; and / or, the thickness L3 of the third split body has a value range of: L3 is 0.04 to 0.20 mm; and / or, the thickness L4 of the fourth split body has a value range of: L4 is 0.04 to 0.80 mm.

4. The battery core structure according to any one of claims 1 to 3, characterized in that: The value range of the width L5 of the first gap is: L5 is 0.1 mm to 0.3 mm; and / or the value range of the width L6 of the second gap is: L6 is 0.1 mm to 0.3 mm.

5. The battery cell structure according to claim 2, characterized in that: An angle α is set between a plane where the central axis of the first split body is located and a plane where the central axis of the second split body is located, wherein the angle α satisfies: 170°≤α≤190°; And / or, an angle β is set between a plane where the central axis of the third sub-body is located and a plane where the central axis of the fourth sub-body is located, wherein the angle β satisfies: 170°≤β≤190°.

6. The battery core structure according to claim 2 or 5, characterized in that: An angle θ is set between a plane where the central axis of the first split body is located and a plane where the central axis of the third split body is located, wherein the angle θ satisfies: 80°≤θ≤100°.

7. The battery cell structure according to claim 1, characterized in that: The shell comprises a bottom shell and a cover body connected to an opening of the bottom shell; the inner cavity is formed between the cover body and the bottom shell; and the first pole ear is connected to the cover body; and the second pole ear is connected to the inner bottom of the bottom shell.

8. The battery cell structure according to claim 1, characterized in that: The winding core structure includes a first pole piece, a second pole piece, and an isolation film arranged between the first pole piece and the second pole piece; the first pole piece, the isolation film, and the second pole piece are wound in sequence to form a winding structure; and the first pole ear is connected to the outer surface of the outermost layer of the first pole piece; the second pole ear is connected to the second pole piece.

9. A battery, characterized in that: The battery cell structure comprises any one of claims 1 to 8.

10. An electrical equipment, characterized in that: A battery comprising the battery as claimed in claim 9.

Images