Battery cell structure, secondary battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery cell structure, a secondary battery and electric equipment, and the battery cell structure comprises a battery cell body and a protection part, at least one first side surface and at least one second side surface are arranged on the battery cell body; the protection part is connected to the battery cell body; the projection, facing the first side surface, of the protection part is at least partially overlapped with the first side surface; and / or the projection, facing the second side surface, of the protection component is at least partially overlapped with the second side surface. According to the utility model, the isolation effect between the battery cell body and the interior of the external packaging box can be realized, so that the phenomena of deformation and damage of the pole piece when the battery cell body moves in the packaging box are avoided; therefore, the use stability and safety are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field especially relates to a kind of electric core structure, secondary battery and electric equipment. BACKGROUND

[0002] With the rapid development of lithium ion battery market, the safety of lithium ion battery is an important characteristic of some laws and regulations, customer demand. Lithium ion battery needs to be dropped, self-weight impact performance test such as roller before leaving factory.

[0003] The current improvement method of the electric core structure is to increase the adhesion of the bare electric core and the packaging shell to reduce the free displacement of the bare electric core inside. However, too much adhesion force can easily tear the bare electric core, and too little adhesion force cannot fix the bare electric core, so that the stability of the method is poor. UTILITY MODEL CONTENT

[0004] The utility model aims at the deficiencies of the prior art, and provides an electric core structure, a secondary battery and an electric device, which can solve the technical problem of poor stability of the prior art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] An electric core structure includes an electric core body and a protection component. The electric core body is provided with at least one first side surface and at least one second side surface. The protection component is connected to the electric core body.

[0007] The projection of the protection component towards the first side surface at least partially overlaps the first side surface, and / or the projection of the protection component towards the second side surface at least partially overlaps the second side surface.

[0008] Preferably, the first side surface and the second side surface are provided with a corner position. The protection component is arranged at the corner position.

[0009] Preferably, the protection component includes a first connecting section, a transition section and a second connecting section connected in sequence. The second connecting section is inclined to the first connecting section. The first connecting section is connected to the first side surface. The second connecting section is connected to the second side surface.

[0010] Preferably, the first connecting section is provided with an abutting inner arc surface. The abutting inner arc surface is recessed from the outside of the first connecting section towards the side surface of the first connecting section. The abutting inner arc surface abuts the first side surface.

[0011] And / or, the first connecting section is further provided with an assembly outer arc surface; the assembly outer arc surface is arranged protruding from the side surface of the first connecting section towards the outside of the first connecting section.

[0012] And / or, a side surface of the second connecting section is provided with an abutting inner plane; the abutting inner plane abuts the battery body.

[0013] Preferably, a relationship between a radius r2 of a circle where the arc of the abutting inner arc surface is located and a thickness d2 of the battery body satisfies: r2 = d2 / 2.

[0014] Preferably, an outer surface of the first connecting section is provided with at least one first flow guide groove; and / or, an outer surface of the second connecting section is provided with at least one second flow guide groove; and / or, an outer surface of the transition section is provided with at least one third flow guide groove.

[0015] And / or, the second connecting section is provided with at least one flow guide through hole; the flow guide through hole is arranged through the thickness direction of the second connecting section; and the flow guide through hole communicates with the inside of the battery body.

[0016] Preferably, on the same plane of the protection component, two side ends of the third flow guide groove respectively communicate with the second flow guide groove and the first flow guide groove.

[0017] Preferably, the battery structure further comprises a packaging film; the packaging film is connected to the outer surface of the battery body and the outer surface of the protection component.

[0018] Preferably, a relationship between the length L2 of the packaging film, the length L1 of the battery body and the thickness d1 of the protection component satisfies: d1 < (L2-L1) / 4.

[0019] A relationship between the thickness d1 of the protection component and the thickness d2 of the battery body satisfies: 0 < d1 ≤ d2.

[0020] Preferably, the protection component is one of polyurethane plastic, polyurethane fiber and polyurethane rubber.

[0021] The utility model discloses a kind of secondary batteries, including the battery structure.

[0022] The utility model discloses a kind of electric equipment, including the secondary battery.

[0023] The utility model discloses the beneficial effect lies in, this technical scheme through adopting the protection component to the first side surface and / or second side surface on the electric core body carries out the protection of side end, can realize the electric core body with the inside barrier action of the packing box of outside, to avoid the pole deformation and breakage phenomenon of electric core body when in packing box inside the movement, and still can realize the protection effect of electric core body in the cylinder test or drop test, further effectively improve the stability and security of use. BRIEF DESCRIPTION OF DRAWINGS

[0024] The features, advantages, and technical effects of the exemplary embodiments of the utility model will be described below with reference to the accompanying drawings. Figures 1-6

[0025] Figure 1 It is the structure schematic drawing of the electric core structure of an embodiment of the utility model;

[0026] Figure 2 It is the structure schematic drawing of the protection component of the electric core structure of an embodiment of the utility model;

[0027] Figure 3 It is the structure schematic drawing of the protection component of the electric core structure of an embodiment of the utility model;

[0028] Figure 4 It is the structure schematic drawing of the protection component of the electric core structure of an embodiment of the utility model;

[0029] Figure 5 It is the partial enlarged view of the electric core structure of an embodiment of the utility model;

[0030] Figure 6 It is the structure schematic drawing of the electric core structure of an embodiment of the utility model.

[0031] In the drawing: 1-electric core body;101-first tab;102-second tab;103-corner position;11-first side surface;12-second side surface;2-protection component;21-first connecting section;211-first flow guide groove;213-abutment inner arc surface;212-assembly outer arc surface;22-second connecting section;221-second flow guide groove;222-abutment inner plane;223-assembly outer plane;23-transition section;231-third flow guide groove;24-flow guide through hole;3-packaging film. DETAILED DESCRIPTION

[0032] ​Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and "with" and variations thereof herein are intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof to the same extent.

[0033] 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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0034] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean: A exists alone, A and B exist together, and multiple cases exist alone. In addition, the character " / " in this paper generally represents an "or" relationship between the front and rear associated objects.

[0036] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] The following will be described in detail in combination with the accompanying drawings Figures 1-6 The utility model will be described in further detail, but not as the limitation of the utility model.

[0038] As Figure 1As shown in the utility model one embodiment, the electric core structure;Including electric core body 1 and protection component 2;Electric core body 1 is equipped with at least one first side surface 11 and at least one second side surface 12;Protection component 2 is connected on electric core body 1;And the projection of protection component 2 towards first side surface 11 and first side surface 11 between at least partial coincidence setting;And / or, the projection of protection component 2 towards second side surface 12 and second side surface 12 between at least partial coincidence setting.In some embodiments, the projection of protection component 2 towards first side surface 11 and first side surface 11 between at least partial coincidence setting;At the same time, the projection of protection component 2 towards second side surface 12 and second side surface 12 between at least partial coincidence setting.

[0039] The utility model discloses the technical scheme of protection component is used to the protection of first side surface and / or second side surface on electric core body, can realize the barrier action of electric core body and the inside of the packaging box of outside, to avoid the deformation and breakage phenomenon of pole tab when electric core body is in the inside of packaging box and moves about;And still can realize the protection of electric core body in the protection of cylinder test or drop test;Further effectively improve the stability and security of use.

[0040] Specifically, in some embodiments, the protection component 2 is polyurethane plastic (mainly foamed plastic), polyurethane fiber (known as spandex in China), polyurethane rubber, etc. Due to the molecular structure and functional group characteristics of polyurethane plastic (mainly foamed plastic), polyurethane fiber (known as spandex in China), polyurethane rubber, etc., it has excellent chemical resistance and can resist corrosion from acids, bases, oils, and various organic solvents, etc. It can be stored stably inside the battery. Therefore, the safety and stability of use are improved.

[0041] Specifically, in some embodiments, as shown in the utility model one embodiment, the electric core structure;Including electric core body 1 and protection component 2;Electric core body 1 is equipped with at least one first side surface 11 and at least one second side surface 12;Protection component 2 is connected on electric core body 1;And the projection of protection component 2 towards first side surface 11 and first side surface 11 between at least partial coincidence setting;And / or, the projection of protection component 2 towards second side surface 12 and second side surface 12 between at least partial coincidence setting.In some embodiments, the projection of protection component 2 towards first side surface 11 and first side surface 11 between at least partial coincidence setting;At the same time, the projection of protection component 2 towards second side surface 12 and second side surface 12 between at least partial coincidence setting. Figure 1 Specifically, in some embodiments, as shown in the utility model one embodiment, the electric core structure;Including electric core body 1 and protection component 2;Electric core body 1 is equipped with at least one first side surface 11 and at least one second side surface 12;Protection component 2 is connected on electric core body 1;And the projection of protection component 2 towards first side surface 11 and first side surface 11 between at least partial coincidence setting;And / or, the projection of protection component 2 towards second side surface 12 and second side surface 12 between at least partial coincidence setting.In some embodiments, the projection of protection component 2 towards first side surface 11 and first side surface 11 between at least partial coincidence setting;At the same time, the projection of protection component 2 towards second side surface 12 and second side surface 12 between at least partial coincidence setting.

[0042] Figure 1 And 2 ​As shown, the protection component 2 comprises a first connecting segment 21, a transition segment 23 and a second connecting segment 22 connected in sequence; the second connecting segment 22 is arranged obliquely with the first connecting segment 21; and the first connecting segment 21 is connected to the first side surface 11; and the second connecting segment 22 is connected to the second side surface 12. Wherein, as shown in Figure 2 As shown, the second connecting segment 22 is arranged perpendicularly with the first connecting segment 21. That is, the number of the protection component 2 is four. That is, through the four protection components 2 shaped as L type, the four corners of the battery body 1 are further comprehensively protected, which can effectively save the input of materials, and also can realize the barrier effect between the battery body and the inside of the packaging box outside, so as to avoid the deformation and damage of the pole piece when the battery body moves in the packaging box. And also can realize the protection effect of the battery body in the drum test or drop test; and further effectively improve the stability and safety of use.

[0043] Specifically, in some embodiments, as shown in Figure 1 , 2 and 3, the first connecting segment 21 is provided with an abutting inner arc surface 212; the abutting inner arc surface 212 is recessed from the outside of the first connecting segment 21 to the side surface of the first connecting segment 21; and the abutting inner arc surface 212 abuts the first side surface 11. Wherein, the first side surface 11 is the side surface formed at the corner position of the battery body. That is, through the abutting protection effect of the recessed abutting inner arc surface 212 on the corner position of the battery body, the stability and safety of use can be effectively improved.

[0044] Specifically, in some embodiments, as shown in Figure 2 and 3 , the first connecting segment 21 is further provided with a fitting outer arc surface 212; the fitting outer arc surface 212 is protruded from the side surface of the first connecting segment 21 to the outside of the first connecting segment 21. Through the protruding fitting outer arc surface 212, the flow guiding effect of the electrolyte at the corner position can be realized, and the infiltration of the electrolyte in the battery body is guaranteed. Wherein, the arc amplitude of the abutting inner arc surface 212 is consistent with the arc amplitude of the fitting outer arc surface 212. Further, as shown in Figure 3 and 5 , the relationship between the radius r2 of the arc of the abutting inner arc surface 212 and the thickness d2 of the battery body 1 satisfies: r2 = d2 / 2. Through the appropriate arc size of the abutting inner arc surface 212, the full coverage of the corner as much as possible can be realized, so as to effectively improve the stability and safety of use.

[0045] Specifically, in some embodiments, as shown in Figure 1As shown, the first and second polar tabs 101 and 102 are arranged on the cell body 1, and the first and second polar tabs 101 and 102 are arranged on the first side surface 11. The first polar tab 101 can be one of the anode tab or the cathode tab, and the second polar tab 102 can be the other of the anode tab or the cathode tab.

[0046] Specifically, in some embodiments, as shown in Figure 1 and 2 As shown, the second connecting section 22 is provided with at least one flow guide through hole 24; the flow guide through hole 24 is arranged through the thickness direction of the second connecting section 22; and the flow guide through hole 24 communicates with the inside of the cell body 1. This structure can improve the flow speed of the electrolyte in the inside through the flow guide through hole 24 arranged through; and can also improve the wicking and exhaust capacity of the electrolyte in the cell; thereby improving the safety and stability of use.

[0047] Specifically, in some embodiments, as shown in Figure 2 and 3 As shown, one side surface of the second connecting section 22 is provided with an abutting inner plane 222; the abutting inner plane 222 abuts the surface of the cell body 1 (the surface of the non-corner position, that is, the side surface with the first and second polar tabs 101 and 102 and the side surface without the first and second polar tabs 101 and 102); and the other side surface of the second connecting section 22 is provided with a fitting outer plane 223. This structure can improve the assembly compactness between the cell body 1 (the surface of the non-corner position, that is, the side surface with the first and second polar tabs 101 and 102 and the side surface without the first and second polar tabs 101 and 102) through the abutting inner plane 222.

[0048] Specifically, in some embodiments, as shown in Figure 3 and 4 As shown, the transition section 23 is selected to be an arc-shaped transition structure; wherein the relationship between the radius r1 of the arc of the arc-shaped transition structure and the thickness d2 of the cell body 1 satisfies: r1=d2 / 2. This structure can achieve as full coverage as possible at the corner through the appropriate arc size of the arc-shaped transition structure, thereby effectively improving the stability and safety of use.

[0049] Specifically, in some embodiments, as shown in Figure 2 and 3 As shown, the outer surface of the first connecting section 21 is provided with at least one first flow guide groove 211; and / or, the outer surface of the second connecting section 22 is provided with at least one second flow guide groove 221; and / or, the outer surface of the transition section 23 is provided with at least one third flow guide groove 231. In some embodiments, as shown in Figure 3As shown, the outer surface of the first connecting section 21 is provided with at least one first flow guide groove 211; the outer surface of the second connecting section 22 is provided with at least one second flow guide groove 221; the outer surface of the transition section 23 is provided with at least one third flow guide groove 231; and on the same plane on the protective component 2, the two side ends of the third flow guide groove 231 are in communication with the second flow guide groove 221 and the first flow guide groove 211 respectively. That is, each layer of the third flow guide groove 231, the second flow guide groove 221 and the first flow guide groove 211 are in communication with each other; thereby facilitating the circulation of the electrolyte inside, in combination with the flow guide through holes 24 of the head and tail portions, to improve the electrolyte infiltration and exhaust capacity inside the battery cell. Among them, the flow guide through holes 24 are arranged between adjacent another first flow guide groove 211.

[0050] Specifically, in some embodiments, as Figure 6 As shown, the battery cell structure further comprises a packaging film 3; the packaging film 3 covers the outer surface of the battery cell body 1 and the outer surface of the protective component 2. Among them, in some embodiments, as Figure 2 、 3 and 4, the thickness of the first connecting section 21, the thickness of the transition section 23 and the thickness of the second connecting section 22 are equal. Further, as Figure 5 and 6 As shown, the relationship between the thickness d1 of the protective component 2 and the thickness d2 of the battery cell body 1 satisfies: 0 < d1 < d2. Further, the relationship between the length L2 of the packaging film 3, the length L1 of the battery cell body 1 and the thickness d1 of the protective component 2 satisfies: d1 < (L2-L1) / 4. That is, the thickness of the protective component 2 should be < (the length of the packaging film after punching - the length of the battery cell body 1) / 4, and the rubber sleeve does not exceed the bare battery cell body after assembly, d1 > 0. This structure can ensure the flatness of the surface of the battery cell structure, and also can ensure the protection of the corner position and the position where the tab extends out, etc. edge position; thereby improving the safety and stability of use.

[0051] The utility model also proposes a secondary battery, this secondary battery includes battery cell structure, the specific structure of this battery cell structure refers to the above-mentioned embodiment, because this secondary battery has adopted all technical schemes of above-mentioned all embodiments, therefore at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, here will not repeat one by one.

[0052] Among them, the secondary battery (Rechargeable battery) is also called as the rechargeable battery or the storage battery, refers to the battery that can be activated by charging after the battery discharges and continues to use. Using the reversibility of chemical reaction, a new battery can be built, that is, after a chemical reaction is converted into electric energy, the chemical system can be repaired by using electric energy, and then the chemical reaction is converted into electric energy, so it is called secondary battery (rechargeable battery). The main rechargeable batteries on the market are nickel-hydrogen battery, nickel-cadmium battery, lead-acid (or lead storage) battery, lithium ion battery, polymer lithium ion battery, etc. The most common secondary battery is lead storage battery, which is composed of two groups of grid-shaped plates arranged alternately, the positive plate is covered with PbO2, the negative plate is covered with Pb, and the electrolyte is H2SO4 solution.

[0053] The utility model also proposes a kind of electric equipment, the electric equipment includes secondary battery, and the specific structure of the secondary battery refers to the above embodiment, since the electric equipment of the present application adopts all the technical solutions of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0054] Among them, the electric equipment can be vehicle, mobile phone, portable device, notebook computer, ship, spacecraft, electric toy and electric tool etc. Vehicle can be fuel automobile, gas automobile or new energy automobile, new energy automobile can be pure electric vehicle, hybrid electric vehicle or extended range vehicle etc.;Spacecraft includes airplane, rocket, space shuttle and spacecraft etc.;Electric toy includes fixed or mobile electric toy, for example, game machine, electric car toy, electric ship toy and electric plane toy etc.;Electric tool includes metal cutting electric tool, grinding electric tool, assembly electric tool and railway electric tool, for example, electric drill, electric grinder, electric wrench, electric screwdriver, electric hammer, impact drill, concrete vibrator and electric planer etc. The above electric equipment is not specially limited in the embodiment of the application.

[0055] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and the skilled person should understand the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that can be understood by the skilled person.

[0056] According to the disclosure and teaching of the above description, the person skilled in the art of the present application can also change and modify the above embodiments. Therefore, the present application is not limited to the above specific embodiments, and any obvious improvement, replacement or modification made by the person skilled in the art on the basis of the present application belongs to the protection scope of the present application. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the present application.

Claims

1. An electric cell structure, characterized by: The battery cell structure comprises a battery cell body and a protection component; the battery cell body is provided with at least one first side surface and at least one second side surface; the protection component is connected to the battery cell body; The projection of the protection component towards the first side surface at least partially overlaps with the first side surface; and / or, the projection of the protection component towards the second side surface at least partially overlaps with the second side surface.

2. The cell structure of claim 1, wherein: An edge corner position is provided between the first side surface and the second side surface; the protection component is arranged at the edge corner position.

3. The cell structure of claim 1 or 2, wherein: The protection component comprises a first connecting section, a transition section and a second connecting section connected in sequence; the second connecting section is arranged obliquely to the first connecting section; the first connecting section is connected to the first side surface; and the second connecting section is connected to the second side surface.

4. The cell structure of claim 3, wherein: An abutting inner arc surface is provided on the first connecting section; the abutting inner arc surface is arranged concavely from the outside of the first connecting section towards the side surface of the first connecting section; and the abutting inner arc surface abuts against the first side surface. An assembling outer arc surface is further provided on the first connecting section; the assembling outer arc surface is arranged convexly from the side surface of the first connecting section towards the outside of the first connecting section. An abutting inner plane is provided on one side surface of the second connecting section; the abutting inner plane abuts against the battery cell body.

5. The cell structure of claim 4, wherein: The relationship between the radius r2 of the arc of the abutting inner arc surface and the thickness d2 of the battery cell body satisfies: r2 = d2 / 2.

6. The cell structure of claim 3, wherein: At least one first flow guide groove is provided on the outer surface of the first connecting section; and / or, at least one second flow guide groove is provided on the outer surface of the second connecting section; and / or, at least one third flow guide groove is provided on the outer surface of the transition section. At least one flow guide through hole is provided on the second connecting section; the flow guide through hole is arranged in the thickness direction of the second connecting section; and the flow guide through hole communicates with the inside of the battery cell body.

7. The cell structure of claim 6, wherein: On the same plane of the protection component, the two side ends of the third flow guide groove respectively communicate with the second flow guide groove and the first flow guide groove.

8. The cell structure of claim 1 or 2, wherein: The battery cell structure further comprises a packaging film; the packaging film is wrapped and connected to the outer surface of the battery cell body and the outer surface of the protection component. The relationship between the length L2 of the packaging film, the length L1 of the battery cell body and the thickness d1 of the protection component satisfies: d1 < (L2-L1) / 4. The relationship between the thickness d1 of the protection component and the thickness d2 of the battery cell body satisfies: 0 < d1 ≤ d2.

9. The cell structure of claim 1, wherein: The protection component is one of polyurethane plastic, polyurethane fiber and polyurethane rubber.

10. A secondary battery characterized by comprising: The battery cell structure comprises any one of claims 1 to 9.

11. An electrical device, characterized by: The secondary battery comprises claim 10. The secondary battery comprises claim 10.

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