Ion battery structure

Abstract

The utility model provides an ion battery structure which is suitable for an ion battery and comprises a shell, a cover plate and at least one battery cell unit, the battery cell unit is arranged in the shell, the cover plate covers the end surface of one end of the shell, and the battery cell unit is connected with the cover plate; the shell comprises a shell body and a flaring part, and the flaring part is circumferentially arranged on the end face of the top end of the shell body; the area of the cross section of the flaring part is gradually increased in the direction from the top end face of the shell body to the cover plate. The end, away from the shell body, of the flaring part abuts against the cover plate. The battery cell and the shell can be quickly positioned, the contact friction between the naked battery cell and the shell opening is reduced, and the diaphragm scratching and breaking risk is avoided. Besides, by controlling the inclination of the flaring part, a certain reinforcing rib effect is achieved on the shell opening, the strength of the shell in the length direction and the width direction can be effectively improved, and the large face of the shell is not prone to deformation and bending.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to an ion battery structure. Background Art

[0002] At present, the global energy structure is still dominated by fossil energy, and the environmental safety problems it causes are becoming increasingly serious; the development and utilization of renewable energy is an effective way to solve energy problems, and energy control is the core means of renewable energy development. Lithium-ion batteries are an effective energy storage method to solve the problem of energy control at this stage. Lithium-ion batteries have the advantages of long life, large specific capacity and no memory effect, and are widely used in new energy vehicles, drones, power tools, communication energy storage and other fields.

[0003] As the energy storage market continues to flourish, energy storage battery products are developing towards larger capacity. At present, large energy storage cells are mainly square in structure, and are developing towards larger single capacity, generally above 280Ah, which results in a large cross-sectional area of ​​the cell inside the single cell, which is easy to damage the cell during the shell insertion process, and is difficult to achieve automation. Utility Model Content

[0004] The embodiment of the utility model provides an ion battery structure, aiming to solve the problems that the cross-sectional area of ​​the battery cell inside the traditional lithium battery single cell is large, the battery cell is easily damaged during the shell insertion process, and it is difficult to realize automation.

[0005] To achieve the above-mentioned purpose, the embodiment of the utility model provides an ion battery structure, which is applicable to an ion battery, comprising a shell, a cover plate and at least one battery cell unit; the battery cell unit is arranged in the shell, the cover plate is covered on the end surface of one end of the shell, and the battery cell unit is connected to the cover plate;

[0006] The shell includes a shell body and a flared portion, wherein the flared portion is circumferentially arranged on the end face of the top end of the shell body; the cross-sectional area of ​​the flared portion gradually increases from the top end face of the shell body to the cover plate; and one end of the flared portion away from the shell body abuts against the cover plate.

[0007] As a preferred embodiment, from the top end surface of the shell body to the cover plate, the flared portion and the top end surface of the shell body are inclined, and the inclination angle is 0.5° to 5°.

[0008] As a preferred embodiment, the inclination angle is 2° to 4°.

[0009] As a preferred embodiment, the flared portion is a triangular flared portion or a trapezoidal flared portion; the flared portion is adapted to be matched with the cover plate.

[0010] As a preferred embodiment, the shell body is a square shell body; the shell body and the flared portion are integrally formed.

[0011] As a preferred embodiment, the ion battery structure further includes a PP film, the PP film is coated on the outer surface of the battery cell unit, and the shell is arranged on the outer side of the PP film; one end of the PP film abuts against the side of the cover plate close to the battery cell unit.

[0012] As a preferred embodiment, the cover plate includes a top cover sheet, a lower plastic, a positive electrode column assembly and a negative electrode column assembly; the positive electrode column assembly and the negative electrode column assembly are respectively arranged at both ends of the top cover sheet, and the lower plastic abuts against the side of the top cover sheet close to the battery cell unit; the PP film abuts against the lower plastic; the negative electrode column assembly and the positive electrode column assembly are respectively connected to the battery cell unit.

[0013] As a preferred embodiment, an explosion-proof valve hole is provided at the geometric center of the top cover sheet, and the explosion-proof valve is provided in the explosion-proof valve hole; a vent hole is provided at the geometric center of the lower plastic, and the vent hole is provided below the explosion-proof valve hole.

[0014] As a preferred embodiment, a liquid injection hole is provided at one end of the top cover sheet close to the positive electrode column assembly.

[0015] As a preferred embodiment, the battery cell unit includes a battery cell body, several positive electrode ears and several negative electrode ears, and the positive electrode ears and the negative electrode ears are alternately arranged on the end face of one end of the battery cell body; the positive electrode ear is connected to the positive electrode column of the positive electrode column assembly through a positive electrode connecting sheet; the negative electrode ear is connected to the negative electrode column of the negative electrode column assembly through a negative electrode connecting sheet.

[0016] As a preferred embodiment, the ion battery is a lithium ion battery, a sodium ion battery or a potassium ion battery.

[0017] Through the structure of the present application, it is possible to achieve rapid positioning of the battery cell and the shell, reduce the contact friction between the bare battery cell and the shell opening, and avoid the risk of scratching or breaking the diaphragm. In addition, by controlling the inclination of the flared portion, the shell opening has a certain reinforcing rib effect, which can effectively improve the strength of the shell in the length and width directions, making the large surface of the shell less likely to deform and bend. Moreover, compared with the traditional process, the present application uses a PP film to coat the battery cell body, which can eliminate the space occupied by the welding of the PP film and the cover plate, and at the same time eliminate the process of gluing the positive and negative poles, which can effectively prevent the hidden danger of electrochemical corrosion and leakage caused by the contact between the negative electrode and the shell. The present application has a simple structure, low preparation cost, small size, good sealing, high energy density of the battery, and high electrical energy stored per unit mass of the battery, and can be suitable for large-capacity and large-size battery structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of an ion battery structure according to an embodiment of the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the explosion structure of the ion battery structure;

[0021] Figure 3 for Figure 1 A schematic cross-sectional view of an ion battery structure;

[0022] Figure 4 It is a schematic structural diagram of a shell according to an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In this application, unless otherwise clearly specified and limited, the terms "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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0028] In the ion battery structure of the embodiment of the present application, the number of battery cell units can be set according to actual use needs, and can be set to one, two, three, four or even more.

[0029] Specifically, Figures 1 to 4 As shown, an embodiment of the present application provides an ion battery structure, which is applicable to ion batteries, including a shell 10, a cover plate 20 and at least one battery cell unit 30; the battery cell unit 30 is arranged in the shell 10, the cover plate 20 is covered on the end surface of one end of the shell 10, and the battery cell unit 30 is connected to the cover plate 20;

[0030] The shell 10 includes a shell body 11 and a flared portion 12, wherein the flared portion 12 is circumferentially arranged on the end face of the top end of the shell body 11; the cross-sectional area of ​​the flared portion 12 gradually increases from the top end face of the shell body 11 to the cover plate 20; the end of the flared portion 12 away from the shell body 11 abuts against the cover plate 20.

[0031] Specifically, in the present embodiment, two battery cell units 30 are provided, and the two battery cell units 30 are arranged in parallel and symmetrically, and the two battery cell units 30 are fixed and abutted together by a plurality of fixed connecting plates 31, which occupies a small space and is convenient for disassembly and assembly and easy to operate.

[0032] By providing a flared portion 12 at one end of the shell body 11 and controlling the cross-sectional area of ​​the flared portion 12 to gradually increase from the top end surface of the shell body 11 to the cover plate 20, the efficiency and accuracy of pre-positioning the battery cell into the shell can be effectively improved, making it easier for the battery cell to slide into the shell, achieving one-time efficient and safe entry of the battery cell into the shell, greatly improving production efficiency and yield, and facilitating automated production. At the same time, the cavity space in the shell can be effectively increased, the injection volume coefficient of the battery cell can be increased, and the electrolyte saturation volume can be increased, which can effectively improve the battery cycle performance and is more conducive to the long-life design of the battery cell.

[0033] As a preferred embodiment, from the top end surface of the shell body 11 to the cover plate 20, the flared portion 12 and the top end surface of the shell body 11 are inclined, and the inclination angle is 0.5° to 5°.

[0034] The angle of inclination can be set according to actual needs, which can be 0.5°, 2°, 2.5°, 3°, 4°, 5°, etc. By controlling the inclination of the flared portion, the shell opening has a certain reinforcing rib effect, which can effectively improve the strength of the shell in the length and width directions, making it difficult for the large surface of the shell to deform and bend.

[0035] As a preferred embodiment, the tilt angle is 2° to 4°. In this way, the battery cell can be more easily slid into the shell, and the battery cell can be safely and efficiently put into the shell at one time, which greatly improves the production efficiency and yield.

[0036] As a preferred embodiment, the flared portion 12 is a triangular flared portion or a trapezoidal flared portion; the flared portion 12 is adapted to the cover plate 20. The shape of the flared portion can be set according to actual use needs. The triangular flared portion or the trapezoidal flared portion has a better reinforcing rib effect, which helps to maintain the shape of the shell, and is more conducive to improving the efficiency and accuracy of pre-positioning the battery cell into the shell, making it easier for the battery cell to slide into the shell. Specifically, in the embodiment of the present application, the flared portion 12 is a trapezoidal flared portion. It can be understood that in other embodiments, the flared portion 12 can also be a triangular flared portion.

[0037] As a preferred embodiment, the shell body 11 is a square shell body; the shell body 11 and the flared portion 12 are integrally formed, so that the sealing of the battery structure can be well ensured.

[0038] As a preferred embodiment, the ion battery structure also includes a PP film 40, which is coated on the outer surface of the battery cell unit 30, and the shell 10 is arranged on the outer side of the PP film 40; one end of the PP film 40 abuts against the side of the cover plate 20 close to the battery cell unit 30.

[0039] As a preferred embodiment, the cover plate 20 includes a top cover sheet 21, a lower plastic 22, a positive electrode column assembly 23 and a negative electrode column assembly 24; the positive electrode column assembly 23 and the negative electrode column assembly 24 are respectively arranged at both ends of the top cover sheet 21, and the lower plastic 22 abuts against the side of the top cover sheet 21 close to the battery cell unit 30; the PP film 40 abuts against the lower plastic 22; the negative electrode column assembly 24 and the positive electrode column assembly 23 are respectively connected to the battery cell unit 30.

[0040] As a preferred embodiment, an explosion-proof valve hole 211 is provided at the geometric center of the top cover sheet 21 , and the explosion-proof valve 50 is provided in the explosion-proof valve hole 211 ; a vent hole 221 is provided at the geometric center of the lower plastic 22 , and the vent hole 221 is provided below the explosion-proof valve hole 211 .

[0041] As a preferred embodiment, a liquid injection hole 212 is provided at one end of the top cover sheet 21 close to the positive electrode column assembly 23 .

[0042] As a preferred embodiment, the battery cell unit 30 includes a battery cell body 31, several positive electrode ears 32 and several negative electrode ears 33, and the positive electrode ears 32 and the negative electrode ears 33 are alternately arranged on the end face of one end of the battery cell body 31; the positive electrode ear 32 is connected to the positive electrode column of the positive electrode column assembly 23 through the positive electrode connecting sheet 60; the negative electrode ear 33 is connected to the negative electrode column of the negative electrode column assembly 24 through the negative electrode connecting sheet 70.

[0043] In the embodiment of the present application, the positive electrode ear 32 and the negative electrode ear 33 are arranged in a straight line, which can effectively utilize the space, make the volume small, the sealing good, the energy density of the battery high, and the electric energy stored in the unit mass of the battery high.

[0044] As a preferred embodiment, the ion battery is a lithium ion battery, a sodium ion battery or a potassium ion battery. Specifically, in this embodiment, the ion battery is a lithium ion battery. It is understandable that in other embodiments, the ion battery may also be a sodium ion battery or a potassium ion battery.

[0045] Through the structure of the present application, it is possible to achieve rapid positioning of the battery cell and the shell, reduce the contact friction between the bare battery cell and the shell opening, and avoid the risk of scratching or breaking the diaphragm. In addition, by controlling the inclination of the flared portion, the shell opening has a certain reinforcing rib effect, which can effectively improve the strength of the shell in the length and width directions, making the large surface of the shell less likely to deform and bend. Moreover, compared with the traditional process, the present application uses a PP film to coat the battery cell body, which can eliminate the space occupied by the welding of the PP film and the cover plate, and at the same time eliminate the process of gluing the positive and negative poles, which can effectively prevent the hidden danger of electrochemical corrosion and leakage caused by the contact between the negative electrode and the shell. The present application has a simple structure, low preparation cost, small size, good sealing, high energy density of the battery, and high electrical energy stored per unit mass of the battery, and can be suitable for large-capacity and large-size battery structures.

[0046] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0047] In addition, it should be understood that although this specification is described according to 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 may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ion battery structure, characterized in that: Applicable to ion batteries, comprising a shell, a cover plate and at least one battery cell unit; the battery cell unit is arranged in the shell, the cover plate is covered on the end surface of one end of the shell, and the battery cell unit is connected to the cover plate; The shell includes a shell body and a flared portion, wherein the flared portion is circumferentially arranged on the end face of the top end of the shell body; the cross-sectional area of ​​the flared portion gradually increases from the top end face of the shell body to the cover plate; and one end of the flared portion away from the shell body abuts against the cover plate.

2. The ion battery structure according to claim 1, characterized in that: From the top end surface of the shell body to the cover plate, the flared portion and the top end surface of the shell body are inclined, and the inclination angle is 0.5° to 5°.

3. The ion battery structure according to claim 2, characterized in that: The tilt angle is 2° to 4°.

4. The ion battery structure according to claim 1, characterized in that: The flared portion is a triangular flared portion or a trapezoidal flared portion; the flared portion is adapted to be arranged with the cover plate.

5. The ion battery structure according to claim 1, characterized in that: The shell body is a square shell body; the shell body and the flared portion are integrally formed.

6. The ion battery structure according to claim 1, characterized in that: The ion battery structure further includes a PP film, which is coated on the outer side of the battery cell unit, and the shell is arranged on the outer side of the PP film; one end of the PP film is in contact with the side of the cover plate close to the battery cell unit.

7. The ion battery structure according to claim 6, characterized in that: The cover plate includes a top cover sheet, a lower plastic, a positive column assembly and a negative column assembly; the positive column assembly and the negative column assembly are respectively arranged at both ends of the top cover sheet, and the lower plastic abuts against the side of the top cover sheet close to the battery cell unit; the PP film abuts against the lower plastic; the negative column assembly and the positive column assembly are respectively connected to the battery cell unit.

8. The ion battery structure according to claim 7, characterized in that: An explosion-proof valve hole is provided at the geometric center of the top cover sheet, and the explosion-proof valve is provided in the explosion-proof valve hole; a vent hole is provided at the geometric center of the lower plastic, and the vent hole is provided below the explosion-proof valve hole; The top cover sheet is provided with a liquid injection hole at one end close to the positive electrode column assembly.

9. The ion battery structure according to claim 8, characterized in that: The battery cell unit includes a battery cell body, a plurality of positive electrode ears and a plurality of negative electrode ears, wherein the positive electrode ears and the negative electrode ears are alternately arranged on the end surface of one end of the battery cell body; the positive electrode ear is connected to the positive electrode column of the positive electrode column assembly through a positive electrode connecting sheet; and the negative electrode ear is connected to the negative electrode column of the negative electrode column assembly through a negative electrode connecting sheet.

10. The ion battery structure according to claim 1, characterized in that: The ion battery is a lithium ion battery, a sodium ion battery or a potassium ion battery.

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