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 protective shell, a battery cell body and a filling body, the battery cell body comprises a winding body and a tab body connected to the winding body; the tab body is arranged on the inner wall of the protective shell; the winding body is arranged in the protective shell; a mounting hole is formed in the winding body; the filling body is arranged in the mounting hole; one end of the filling body extends to the opening of the mounting hole, and the filling body is connected with the tab body; and the tab body is propped against the protective shell. According to the utility model, the assembly process can be effectively simplified, and the assembly efficiency is improved; and the stability of the whole structure can be guaranteed.

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 secondary batteries are made by spirally winding electrode plates and a separator between them to form a cell. This cell is then enclosed in a stainless steel, nickel-plated iron, or aluminum metal casing, or a laminated flexible film battery container. The electrolyte is then injected and sealed to form the battery. Electrical connection between the cell and the outside world is achieved through the connection between the tabs connected to the plates and the terminal posts or cover plates.

[0003] However, existing battery cell structures use welding to assemble the positive and negative tabs to the housing. Because the welding process is subject to numerous factors and is prone to variation, welding quality cannot be guaranteed. These welding methods have a certain defect rate, resulting in a high probability of batch defects. Furthermore, the welding process is complex and inefficient, prolonging the entire battery cell production process and leading to poor assembly efficiency for the overall structure. Utility Model Content

[0004] The purpose of the present invention is to provide a battery core structure to solve the technical problem of poor assembly efficiency of the overall structure 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 includes a protective shell, a battery cell body and a filling body; the battery cell body includes a winding body and a tab body connected to the winding body; the tab body is arranged on the inner wall of the protective shell; the winding body is arranged inside the protective shell; and a mounting hole is provided in the winding body; the filling body is arranged inside the mounting hole; and one end of the filling body extends to the opening of the mounting hole, and the filling body is connected to the tab body; the tab body abuts against the protective shell.

[0007] Preferably, the mounting hole is provided through the height direction of the winding body; and both side ends of the filling body extend to the openings of both side ends of the mounting hole respectively.

[0008] Preferably, the diameter of the mounting hole is D2, which satisfies: D2 = 1.0 mm to 5 mm

[0009] And / or, the relationship between the diameter of the mounting hole (D2) and the diameter of the filling body (D1) satisfies: D2≥D1.

[0010] Preferably, the relationship between the projected area S1 of the filling body toward the mounting hole and the cross-sectional area S2 of the mounting hole satisfies: (80% to 100%)*S2=S1.

[0011] Preferably: the filling body includes an elastic member and at least one insulating member; one end of the insulating member is connected to the elastic member; the other end of the insulating member extends toward the opening of the mounting hole; and the other end of the insulating member abuts against the tab body.

[0012] Preferably, when there is one insulating member, one end of the elastic member extends to the opening at the bottom of the mounting hole, and the elastic member abuts against the inner bottom of the protective shell; one end of the insulating member extends to the opening at the top of the mounting hole, and the insulating member abuts against the tab body at the inner top of the protective shell;

[0013] Alternatively, when the number of the insulating parts is two, all the insulating parts are relatively arranged at the two side ends of the elastic part; and one end of one of the insulating parts abuts against the tab body at the top of the protective shell; and the tab body at the top of the protective shell abuts against the protective shell; one end of the other insulating part abuts against the tab body at the bottom of the protective shell; and the tab body at the bottom of the protective shell abuts against the protective shell.

[0014] Preferably, at least one protrusion is provided on the surface of the insulating member; the protrusion is provided so as to protrude from the insulating member toward the opening of the mounting hole.

[0015] Preferably, the thickness h of the bump satisfies: h=0.1 mm to 0.3 mm.

[0016] Preferably: the protective shell includes a main protective shell and a cover plate connected to the main protective shell; the wound body is arranged between the main protective shell and the cover plate; the tab body includes a first tab and a second tab; and one end of the first tab is connected to the wound body; the other end of the first tab is bent toward the cover plate and is located above the mounting hole; one end of the second tab is connected to the wound body; the other end of the second tab is bent toward the inner wall of the main protective shell; and the first tab and / or the second tab abuts against the filling body.

[0017] Preferably: the wound body includes a first pole piece, an isolation membrane and a second pole piece stacked in sequence; and the polarity of the first pole piece is opposite to the polarity of the second pole piece; the first pole piece, the isolation membrane and the second pole piece are wound as one; the mounting hole is arranged in the innermost layer of the wound body.

[0018] The utility model also discloses a battery, comprising the battery core structure.

[0019] The utility model also discloses an electrical device comprising the battery.

[0020] The beneficial effect of the present invention is that the technical solution can eliminate the welding process between the tab body and the shell by assembling the filling body and the tab body located inside the winding body, thereby reducing damage to the tab body and effectively simplifying the assembly process and improving assembly efficiency; it can also ensure the stability of the overall structure, improve the safety of use and the overall yield of the battery cell production process; in addition, by assembling the filling body to the inside of the winding body, the compact performance of the overall structure can be improved, the assembly method can be simplified, and the stability of the overall structure can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following will refer to the attached Figures 1 to 4 To describe the features, advantages and technical effects of exemplary embodiments of the present invention.

[0022] Figure 1 This is a cross-sectional view of a battery cell structure according to an embodiment of the present invention;

[0023] Figure 2 This is a structural schematic diagram of a filling body of a battery core structure according to an embodiment of the present utility model;

[0024] Figure 3 This is a cross-sectional view of a battery cell structure according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic structural diagram of a wound body of a battery core structure according to an embodiment of the present invention.

[0026] In the figure: 1-protective shell; 11-main shell; 12-cover plate; 121-insulator; 2-cell body; 21-ear body; 211-first pole piece; 212-isolation membrane; 213-second pole piece; 22-winding body; 221-first pole ear; 222-second pole ear; 201-mounting hole; 3-filling body; 31-insulating member; 32-elastic member; 33-bump. DETAILED DESCRIPTION

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0028] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0029] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or multiple situations exist. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0031] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0032] The following is combined with Figures 1 to 4 The present invention is further described in detail, but is not intended to limit the present invention.

[0033] like Figure 1 As shown, in one embodiment of the present invention, the battery cell structure includes a protective shell 1, a battery cell body 2 and a filling body 3; the battery cell body 2 includes a winding body 22 and a tab body 21 connected to the winding body 22; the tab body 21 is arranged on the inner wall of the protective shell 1; the winding body 22 is arranged inside the protective shell 1; and a mounting hole 201 is provided in the winding body 22; the filling body 3 is arranged inside the mounting hole 201; and one end of the filling body 3 extends to the opening of the mounting hole 201 and is connected to the tab body 21.

[0034] The technical solution of the present invention can eliminate the welding process between the tab body and the shell by assembling the filling body and the tab body located inside the winding body, thereby reducing damage to the tab body and effectively simplifying the assembly process and improving assembly efficiency; it can also ensure the stability of the overall structure, improve the safety of use and the overall yield of the battery cell production process; in addition, by assembling the filling body to the inside of the winding body, the compact performance of the overall structure can be improved, the assembly method can be simplified, and the stability of the overall structure can be improved.

[0035] Specifically, in some embodiments, Figure 1 and 3 As shown, the protective shell 1 includes a main protective shell 11 and a cover plate 12 connected to the opening of the main protective shell 11; the winding body 22 is arranged between the main protective shell 11 and the cover plate 12; the pole ear body 21 includes a first pole ear 221 and a second pole ear 222; and one end of the first pole ear 221 is connected to the winding body 22; the other end of the first pole ear 221 is bent toward the cover plate 12; one end of the second pole ear 222 is connected to the winding body 22; the other end of the second pole ear 222 is bent toward the inner wall (for example, the inner bottom) of the main protective shell 11; and the first pole ear 221 and / or the second pole ear 222 abuts against the filling body 3. The structure can effectively save internal assembly space and ensure the compactness of the structure by bending the first pole tab 221 and the second pole tab 222. Moreover, the filler 3 abuts against the first pole tab 221 and / or the second pole tab 222, which can reduce the welding process during assembly and ensure assembly stability and good contact performance of the pole tabs, thereby improving the safety of use and the overall yield rate of the battery cell production process. Figure 3 As shown, at least one insulator 121 is provided on the cover plate 12; further, the insulator is PP insulation to isolate the positive electrode column from the cover plate (negative electrode), thereby improving the safety and stability of use.

[0036] Wherein, in some embodiments, Figure 1 and 4As shown, the wound body 22 includes a first electrode sheet 211, a separator 212, and a second electrode sheet 213 stacked in sequence. The polarity of the first electrode sheet 211 is opposite to that of the second electrode sheet 213. The first electrode sheet 211, separator 212, and second electrode sheet 213 are wound together as a single body. The mounting hole 201 is located in the innermost layer of the wound body 22. The first electrode sheet 211 is the positive electrode sheet, and the second electrode sheet 213 is the negative electrode sheet. Furthermore, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, which is coated on the surface of the positive electrode current collector. The positive electrode current collector includes a positive electrode coating region and a positive electrode tab connected to the positive electrode coating region. The positive electrode coating region is coated with the positive electrode active material layer, while the positive electrode tab is not coated with the positive electrode active material layer. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer includes a positive electrode active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, with the negative electrode active material layer coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode coating region and a negative electrode tab connected to the negative electrode coating region. The negative electrode coating region is coated with the negative electrode active material layer, while the negative electrode tab is not coated with the negative electrode active material layer. The negative electrode current collector can be made of copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon, for example. The separator 212 can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0037] Specifically, in some embodiments, Figure 1 As shown, the mounting hole 201 is provided throughout the height direction of the wound body 22; and the two side ends of the filler body 3 extend to the openings at the two side ends of the mounting hole 201. That is, the two side ends of the filler body 3 extend through the openings at the two side ends of the mounting hole 201 and respectively abut against the first electrode tab 221 and the second electrode tab 222; this enables the first electrode tab 221 to be squeezed and clamped by the filler body 3 and the cover plate 12, and the second electrode tab 222 to be squeezed and clamped by the filler body 3 and the main housing, thereby reducing the welding process during assembly and ensuring assembly stability and good contact performance between the electrode tabs, thereby improving user safety and the overall yield rate of the battery cell production process.

[0038] Specifically, in some embodiments, Figure 1 and 3As shown, the relationship between the diameter D2 of the mounting hole 201 and the diameter D1 of the filler 3 satisfies: D2 ≥ D1. Preferably, the relationship between the projected area S1 of the filler 3 toward the mounting hole 201 and the cross-sectional area S2 of the mounting hole 201 satisfies: (80% to 100%) * S2 = S1. Most preferably, 80% * S2 ≥ S1. In other words, the diameter of the mounting hole 201 is greater than or equal to the length of the filler 3, and the assembly ratio of the end surface area of ​​the filler 3 to the end surface area of ​​the mounting hole 201 (i.e., the area of ​​the end surface of the filler 3 / the area of ​​the end surface of the mounting hole 201) is ≥ 80%. This structure ensures convenient assembly of the filler 3 and the extrusion performance of the wound body itself, preventing deformation. It also ensures convenient and stable extrusion assembly of the first and second tabs 221 and 222, thereby ensuring assembly stability and good tab contact performance.

[0039] Specifically, in some embodiments, Figure 1 and 3 As shown, the diameter D2 of the mounting hole 201 satisfies: D2 = 1.0 mm to 5 mm. This structure ensures the structural stability of the wound body 22 by having a mounting hole 201 of a certain appropriate size. It also ensures the convenience and stability of the extrusion assembly of the first and second tabs 221 and 222, thereby ensuring assembly stability and good tab contact performance.

[0040] Specifically, in some embodiments, Figure 1 and 2 As shown, the filling body 3 includes an elastic member 32 and at least one insulating member 31; one end of the insulating member 31 is connected to the elastic member 32; the other end of the insulating member 31 extends toward the opening of the mounting hole 201; and the other end of the insulating member 31 abuts against the tab body 21 (the first tab 221 and / or the second tab 222). In some embodiments, when the number of insulating members 31 is one (not shown in the figure), one end of the elastic member 32 extends to the opening at the bottom of the mounting hole 201, and the elastic member 32 abuts against the inner bottom of the protective shell 1 (the second tab 222); one end of the insulating member 31 extends to the opening at the top of the mounting hole 201, and the insulating member 31 abuts against the inner top of the protective shell 1 (the first tab 221). This structure can improve the assembly tightness between the tab and the cover plate by the abutment of the insulating member 31 against the first tab 221 at the cover plate 12, thereby ensuring assembly stability and good tab contact performance. In other embodiments, such as Figure 2 and 3As shown, when there are two insulating members 31, all insulating members 31 are positioned oppositely to the ends of the elastic member 32. One end of one insulating member 31 abuts the inner top of the protective shell 1 (the first tab 221), while the other end of the other insulating member 31 abuts the inner bottom of the protective shell 1 (the second tab 222). This structure, through the abutting assembly of the insulating members 31 at both ends, ensures tight contact between the first tab 221 and the second tab 222, respectively, protecting the shell 1, thereby ensuring assembly stability and good tab contact performance. The elastic member 32 is a spring, and the spring force can be set within a range of 100 to 1000 g / f. The required elastic force of the elastic member 32 is determined by selecting the corresponding material and dimensions, as calculated by the formula: elastic force = elastic coefficient * elastic element deformation displacement. The insulating member 31 can be cylindrical, for example, and can be made of non-metallic materials, such as plastic or rubber, that are not conductive. Alternatively, the insulating member 31 can be made of a metal material with an insulating coating.

[0041] Specifically, in some embodiments, Figure 2 As shown, at least one protrusion 33 is provided on the surface of the insulating member 31; the protrusion 33 is provided so as to protrude from the insulating member 31 toward the opening of the mounting hole 201. Figure 2 As shown, the thickness h of the bump 33 satisfies: h = 0.1 mm to 0.3 mm. This structure can improve the tightness of the contact between the first tab and the cover plate through the local squeezing effect of the bumps 33 at both ends.

[0042] The present 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 cell structure 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.

[0043] The present invention also provides an electrical device, which includes a battery. The specific structure of the battery is as described above. Since the present 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 in detail here.

[0044] Among them, 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. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecraft, 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 power tools, grinding power tools, assembly power tools and railway power 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 any special restrictions on the above-mentioned electrical equipment.

[0045] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 methods that can be understood by those skilled in the art.

[0046] Based on the disclosure and teachings of the above description, those skilled in the art will be able to make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments described above. Any obvious improvements, substitutions, or modifications made by those skilled in the art based on the present invention fall within the scope of protection of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience only and do not constitute any limitation on the present invention.

Claims

1. A battery cell structure, characterized in that: It includes a protective shell, a battery cell body and a filling body; the battery cell body includes a winding body and a tab body connected to the winding body; the tab body is arranged on the inner wall of the protective shell; the winding body is arranged inside the protective shell; and a mounting hole is provided in the winding body; the filling body is arranged inside the mounting hole; and one end of the filling body extends to the opening of the mounting hole, and the filling body is connected to the tab body; the tab body abuts against the protective shell.

2. The battery cell structure according to claim 1, wherein: The mounting hole is arranged to penetrate the winding body in a height direction; and both side ends of the filling body extend to the openings of both side ends of the mounting hole respectively.

3. The battery cell structure according to claim 1, wherein: The diameter of the mounting hole is D2, which satisfies: D2 = 1.0 mm to 5 mm; And / or, the relationship between the diameter of the mounting hole (D2) and the diameter of the filling body (D1) satisfies: D2≥D1.

4. The battery core structure according to claim 1 or 3, characterized in that: The relationship between the projected area S1 of the filling body toward the mounting hole and the cross-sectional area S2 of the mounting hole satisfies: (80% to 100%)*S2=S1.

5. The battery cell structure according to claim 1, characterized in that: The filling body includes an elastic member and at least one insulating member; one end of the insulating member is connected to the elastic member; the other end of the insulating member extends toward the opening of the mounting hole; and the other end of the insulating member abuts against the tab body.

6. The battery cell structure according to claim 5, characterized in that: When the number of the insulating member is one, one end of the elastic member extends to the opening at the bottom of the mounting hole, and the elastic member abuts against the inner bottom of the protective shell; One end of the insulating member extends to the opening at the top of the mounting hole, and the insulating member abuts against the tab body at the top of the protective shell; Alternatively, when the number of the insulating parts is two, all the insulating parts are relatively arranged at the two side ends of the elastic part; and one end of one of the insulating parts abuts against the tab body at the top of the protective shell; and the tab body at the top of the protective shell abuts against the protective shell; one end of the other insulating part abuts against the tab body at the bottom of the protective shell; and the tab body at the bottom of the protective shell abuts against the protective shell.

7. The battery cell structure according to claim 5 or 6, characterized in that: At least one protrusion is provided on the surface of the insulating member; the protrusion is provided so as to protrude from the insulating member toward the opening of the mounting hole.

8. The battery cell structure according to claim 7, characterized in that: The thickness h of the bump satisfies: h=0.1 mm to 0.3 mm.

9. The battery core structure according to claim 1, 5 or 6, characterized in that: The protective shell includes a main protective shell and a cover plate connected to the main protective shell; the wound body is arranged between the main protective shell and the cover plate; the tab body includes a first tab and a second tab; and one end of the first tab is connected to the wound body; the other end of the first tab is bent toward the cover plate and is located above the mounting hole; one end of the second tab is connected to the wound body; the other end of the second tab is bent toward the inner wall of the main protective shell; and the first tab and / or the second tab abuts against the filling body.

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

11. An electrical device, characterized in that: A battery comprising the battery of claim 10.

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