Battery structure for improving liquid absorption and liquid storage of battery

Abstract

The utility model discloses a battery structure for improving liquid absorption and liquid storage of a battery. The battery structure comprises a shell, an insulating film, a battery cell and a top cover, the outer side of the battery cell is sleeved with the insulating film, the outer side of the insulating film is sleeved with the shell, the top cover is arranged at the top of the battery cell, and the top cover abuts against the shell; the height of the insulating film is smaller than that of the shell; an opening is formed in one end, close to the top cover, of the insulating film; at least one edge of the opening is provided with a horn mouth; and in the direction from the bottom of the insulating film to the top cover, the horn mouth extends outwards to form a radian. By means of the structure, no extra manufacturing procedure needs to be added, direct replacement can be carried out on the basis of an existing insulating film, assembling is simple, and cost is low; moreover, secondary damage to the battery cell is avoided, meanwhile, the utilization rate of the residual electrolyte can be effectively improved, and the infiltration effect of the electrolyte on the battery cell and the overall performance of the battery are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field especially relates to a kind of battery structure for improving battery liquid absorption and liquid storage. BACKGROUND

[0002] Lithium ion battery and sodium ion battery are widely used in energy storage power supply systems of water, fire, wind and solar power station due to high voltage, long cycle life, long storage time and other advantages. Lithium ion battery and sodium ion battery are mainly assembled with metal shell. In order to prevent short circuit caused by contact between bare cell and metal shell and cause safety accident, insulation is needed between bare cell and shell. The existing treatment method is to wrap a layer of insulation film outside the bare cell before assembling it into the metal shell.

[0003] In the production process, the battery with metal shell injects electrolyte into the battery through the injection hole on the top cover of the battery, and the bare cell is mainly placed in an upright manner in the battery, and the insulation film is tightly wrapped around the bare cell, so that the electrolyte cannot completely soak the inside of the battery, and most of the electrolyte is deposited at the bottom of the battery, thereby reducing the overall performance of the battery.

[0004] Patent CN202321822237 discloses a kind of battery insulation film and battery, which is provided with a plurality of extension parts on the side surface of the insulation film. The extension part extends outward and bends, and the extension part forms a liquid storage space with the side surface. When subjected to extrusion, the internal electrolyte flows out and soaks the cell along the end of the extension part. However, during the extrusion process, the cell is easily damaged, resulting in short circuit and safety risk. At the same time, the manufacturing difficulty of the insulation film is relatively high, which is not conducive to cost control. UTILITY MODEL CONTENTS

[0005] The utility model embodiment provides a kind of battery structure for improving battery liquid absorption and liquid storage, to solve the problem that the existing insulation film and cell covering cause electrolyte to be unable to completely soak the inside of the battery, electrolyte is deposited at the bottom of the battery, thereby reducing the overall performance of the battery and other problems.

[0006] To solve the above technical problems, the utility model embodiment provides a kind of battery structure for improving battery liquid absorption and liquid storage, which comprises a shell, an insulation film, a cell and a top cover. The insulation film is sleeved on the outside of the cell, the shell is sleeved on the outside of the insulation film, the top cover is arranged on the top of the cell, and the top cover is arranged in abutment with the shell.

[0007] The height of the insulation film is less than the height of the shell. One end of the insulation film close to the top cover is provided with an opening. At least one side of the opening is provided with a flared opening. From the bottom of the insulation film to the top cover, the flared opening extends outward in an arc shape.

[0008] As a preferred implementation, each side of the opening is provided as the trumpet mouth.

[0009] As a preferred implementation, the insulating film, the opening and the trumpet mouth are integrally formed.

[0010] As a preferred implementation, the edge of the trumpet mouth near one end of the top cover is in abutment with the inner wall of the shell.

[0011] As a preferred implementation, a gap is provided between the trumpet mouth and the electric core; the gap between the trumpet mouth and the electric core gradually increases from the bottom of the insulating film to the direction of the top cover.

[0012] As a preferred implementation, the height of the insulating film is the same as the height of the electric core.

[0013] As a preferred implementation, the top cover is in abutment with the top of the electric core; the top cover is provided with a liquid injection port; the liquid injection port is in communication with the electric core.

[0014] As a preferred implementation, the battery structure for improving the liquid absorption and storage of the battery is a power battery structure; the shell is a metal shell.

[0015] As a preferred implementation, the power battery structure is a lithium ion battery structure or a sodium ion battery structure.

[0016] The application increases the space between the electric core and the trumpet mouth by providing a trumpet mouth on at least one side of the opening of the insulating film and extending the trumpet mouth outward in an arc shape, and the edge of the trumpet mouth is in abutment with the inner wall of the shell to form a blocking wall. When the electrolyte is injected, the electrolyte flows into the electric core along the trumpet mouth of the insulating film; because the height of the insulating film is less than the height of the shell, the electrolyte on the inner wall of the metal shell also flows down along the inner wall and flows into the electric core along the trumpet mouth of the insulating film, thereby effectively enhancing the electrolyte infiltration effect of the bare electric core and improving the overall performance of the battery.

[0017] Compared with the prior art, the technical scheme of the embodiment of the application has the following beneficial effects: through the structure of the application, no additional manufacturing process is needed, the existing insulating film can be directly replaced, assembly is simple and cost-effective; and no secondary damage is caused to the electric core, while the utilization rate of residual electrolyte can be effectively improved, the electrolyte infiltration effect on the electric core and the overall performance of the battery are greatly improved. The structure of the application is simple, easy to disassemble and assemble, easy to maintain, has good stability, is economical, safe, practical, can greatly improve the mixing capacity of gas, can be applied to a fuel cell stack, and well meets the needs of actual use. BRIEF DESCRIPTION OF DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a battery structure that improves the liquid absorption and storage capabilities of a battery according to an embodiment of the present invention.

[0020] Figure 2 for Figure 1 An exploded structural diagram illustrating a battery structure that improves liquid absorption and storage capabilities.

[0021] Figure 3 for Figure 2 A schematic diagram of the structure of the insulating film.

[0022] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0024] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] In existing battery structures, the opening of the insulating film used for assembling the metal casing is generally rectangular and closely fitted to the bare cell. Since the bare cell is placed vertically, most of the electrolyte is stored between the insulating film and the inner wall of the metal casing during electrolyte injection. This results in the electrolyte not being able to completely wet the inside of the battery, thus affecting the overall performance of the battery.

[0026] Currently, the mainstream liquid injection method is negative pressure injection. During the injection process, the electrolyte will randomly diffuse to the internal space of the metal shell after leaving the injection port. The electrolyte diffused in all directions will be isolated by the blocking wall formed by the edge of the trumpet mouth close to the top cover end and the inner wall of the shell during the injection. The blocking wall will also form a water seal line in the later stage of the injection, so that the injected electrolyte will flow to the bare battery cell along the edge of the insulating film, thereby enhancing the electrolyte infiltration of the head of the bare battery cell and improving the electrolyte absorption of the bare battery cell, and further improving the overall performance of the battery structure.

[0027] Specifically, as shown in the drawings, the utility model discloses a battery structure that improves liquid absorption and storage of battery, including shell 10, insulating film 20, battery cell 30 and top cover 40, the insulating film 20 is set on the outside of battery cell 30, the shell 10 is set on the outside of insulating film 20, the top cover 40 is arranged at the top of battery cell 30, and the top cover 40 is arranged in abutment with the shell 10. Figures 1 to 3

[0028] The height of the insulating film 20 is less than the height of the shell 10. One end of the insulating film 20 close to the top cover 40 is provided with an opening. At least one side of the opening is provided with a trumpet mouth 21. From the bottom of the insulating film 20 to the top cover 40, the trumpet mouth 21 extends outwardly in an arc shape.

[0029] In the embodiment of the application, the trumpet mouth 21 extends outwardly in an arc shape, which means that one side of the opening extends towards the shell and is inclined at a certain angle. The degree of the inclination angle can be set according to actual needs and can be any degree.

[0030] By providing the trumpet mouth on at least one side of the opening of the insulating film and extending the trumpet mouth outwardly in an arc shape, the space between the battery cell and the trumpet mouth is increased, and the edge of the trumpet mouth abuts against the inner wall of the shell to form a blocking wall. When the electrolyte is injected, the electrolyte flows into the battery cell along the trumpet mouth of the insulating film. Since the height of the insulating film is less than the height of the shell, the electrolyte on the inner wall of the metal shell also flows into the battery cell along the trumpet mouth of the insulating film when it flows down along the inner wall, thereby effectively enhancing the electrolyte infiltration effect of the bare battery cell and improving the overall performance of the battery.

[0031] As a preferred embodiment, each side of the opening is provided with the trumpet mouth 21. In this way, the electrolyte infiltration effect on the battery cell can be better enhanced, and the electrolyte can be effectively stored.

[0032] As a preferred embodiment, the insulating film 20, the opening and the trumpet mouth 21 are integrally formed.

[0033] ​As a preferred embodiment, the trumpet mouth 21 is arranged in abutment with the inner wall of the shell 10 at the edge of one end of the top cover 40. In this way, the space between the cell and the trumpet mouth is increased, and the edge of the trumpet mouth abuts the inner wall of the shell to form a blocking wall. In the structure of the application, the blocking wall also forms a water seal line in the later stage of liquid injection, so that the injected electrolyte flows along the edge of the insulating film to the bare cell, not only enhancing the electrolyte infiltration of the head of the bare cell, but also improving the electrolyte absorption amount of the bare cell.

[0034] As a preferred embodiment, a gap is arranged between the trumpet mouth 21 and the cell 30; from the bottom of the insulating film 20 to the direction of the top cover 40, the gap between the trumpet mouth 21 and the cell 30 gradually increases.

[0035] As a preferred embodiment, the height of the insulating film 20 is the same as the height of the cell 30. In this way, the electrolyte infiltration effect on the cell can be ensured.

[0036] As a preferred embodiment, the top cover 40 is arranged in abutment with the top of the cell 30; the top cover 40 is provided with a liquid injection port 41; the liquid injection port 41 is arranged in communication with the cell 30.

[0037] As a preferred embodiment, the battery structure for improving the liquid absorption and storage of the battery is a power battery structure; and the shell 10 is a metal shell.

[0038] As a preferred embodiment, the power battery structure is a lithium ion battery structure or a sodium ion battery structure.

[0039] Through the structure of the application, without increasing additional manufacturing processes, the existing insulating film can be directly replaced, the assembly is simple and the cost is affordable; and the residual electrolyte utilization rate can be effectively improved, the electrolyte infiltration effect on the cell and the overall performance of the battery are greatly improved. The structure of the application is simple, easy to disassemble and assemble, easy to maintain, has good stability, is economical, safe and practical, can greatly improve the mixing ability of gas, can be applied to a fuel cell stack, and well meets the needs of actual use.

[0040] In the description of the present specification, the description referring to the terms "an embodiment", "an example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0041] 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 specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0042] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery structure for improving electrolyte absorption and storage, characterized in that, The battery structure for improving liquid absorption and storage of the battery comprises a shell, an insulating film, a battery cell and a top cover; the insulating film is sleeved outside the battery cell, the shell is sleeved outside the insulating film, the top cover is arranged on the top of the battery cell, and the top cover is in abutment with the shell; The height of the insulating film is less than the height of the shell; An end of the insulating film close to the top cover is arranged as an opening; at least one side of the opening is arranged as a horn opening; from the bottom of the insulating film to the top cover, the horn opening extends outward in an arc shape.

2. The battery structure for improving liquid absorption and storage of a battery according to claim 1, wherein Each side of the opening is arranged as the horn opening.

3. The battery structure for improving liquid absorption and storage of a battery according to claim 1, wherein The insulating film, the opening and the horn opening are integrally formed.

4. The battery structure for improving liquid absorption and storage of a battery according to claim 1, wherein The edge of the horn opening close to the end of the top cover is in abutment with the inner wall of the shell.

5. The battery structure for improving liquid absorption and storage of a battery according to claim 1, wherein A gap is arranged between the horn opening and the battery cell; from the bottom of the insulating film to the top cover, the gap between the horn opening and the battery cell gradually increases.

6. The battery structure for improving liquid absorption and storage of a battery according to claim 1, wherein The height of the insulating film is the same as the height of the battery cell.

7. The battery structure for improving liquid absorption and storage of a battery according to claim 1, wherein The top cover is in abutment with the top of the battery cell; a liquid injection port is arranged on the top cover; the liquid injection port is in communication with the battery cell.

8. The battery structure for improving liquid absorption and storage of a battery according to claim 1, wherein The battery structure for improving liquid absorption and storage of the battery is a power battery structure; the shell is a metal shell.

9. The battery structure for improving liquid absorption and storage of a battery according to claim 8, wherein The power battery structure is a lithium ion battery structure or a sodium ion battery structure.

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