Battery liquid injection auxiliary device and top cover structure

Abstract

The utility model relates to a battery liquid injection auxiliary device which is suitable for a battery top cover structure and comprises a liquid injection auxiliary body, and a through hole penetrating through the liquid injection auxiliary body is formed in the center of the liquid injection auxiliary body; a plurality of arc walls are arranged on the liquid injection auxiliary body and uniformly surround the through hole; a first gap is formed between every two adjacent arc walls; the liquid injection auxiliary body and the multiple arc walls are integrally formed. The utility model also provides a battery top cover structure. According to the battery liquid injection auxiliary device, the electrolyte infiltration uniformity of the high-capacity battery pole piece can be effectively improved, so that the whole liquid injection process is quick, simple and convenient. The cover plate is simple in structure, low in cost and good in reliability, can be produced and used as a general product, can meet the requirements of products in the current market, does not affect the safety performance of the cover plate, does not need additional liquid injection equipment, and can effectively save the cost.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery liquid injection auxiliary device and a top cover structure. Background Art

[0002] In the existing technology, when lithium-ion batteries are injected, the interior of the battery is generally first evacuated to a negative pressure state using a vacuum pump, and then the pressure difference between the inside and outside of the battery cavity is used to achieve the purpose of self-priming injection. However, existing process technologies make it difficult to ensure the batch stability of battery quality, resulting in a large number of defective batteries. In terms of the injection process, 500 to 600 grams or even more electrolyte needs to be accurately injected into the battery within a limited time and ensure that the electrolyte is fully infiltrated. The existing injection holes are relatively small and cannot meet the above injection requirements.

[0003] As demands for lithium-ion battery capacity and range become increasingly stringent, large-capacity cells are becoming a new area of ​​focus for lithium-ion battery manufacturers. The larger internal volume of large-capacity cells prevents the electrolyte from fully soaking into the battery in a short period of time. Furthermore, the length and width of large-capacity batteries make it difficult to ensure uniform electrolyte absorption across the electrodes, significantly reducing battery production efficiency and product quality, making it difficult to guarantee both filling efficiency and battery quality. Utility Model Content

[0004] Based on this, the utility model provides a battery filling auxiliary device and top cover structure, aiming to solve the problems of difficult battery filling, slow electrolyte infiltration and poor electrolyte infiltration in existing batteries. The present invention has a simple structure, low cost, good reliability, and can be produced and used as a general product.

[0005] To achieve the above-mentioned purpose, on the one hand, the embodiment of the present utility model proposes the following technical solutions: a battery liquid filling auxiliary device, suitable for a battery top cover structure, comprising a liquid filling auxiliary body, a through hole penetrating the liquid filling auxiliary body is provided at the center of the liquid filling auxiliary body; a plurality of arc walls are provided on the liquid filling auxiliary body, and the plurality of arc walls are evenly arranged around the through hole; a first gap is provided between two adjacent arc walls; the liquid filling auxiliary body and the plurality of arc walls are integrally formed.

[0006] As a preferred embodiment, each of the arc walls is provided with a curvature.

[0007] As a preferred embodiment, a plurality of the arc walls are arranged to enclose and form a gap for accommodating the electrolyte; the gap is respectively connected to the through hole and the first gap.

[0008] As a preferred embodiment, a plurality of the arc walls are circumferentially arranged on the edge of the liquid injection auxiliary body; and the through hole and the liquid injection auxiliary body are integrally formed.

[0009] As a preferred embodiment, the liquid injection auxiliary body is adapted to be arranged to fit the liquid injection hole of the battery top cover structure.

[0010] On the other hand, an embodiment of the present invention also provides a battery top cover structure, including a cover plate, a lower plastic sheet and the battery liquid filling auxiliary device, the cover plate is arranged on the lower plastic sheet, and the lower plastic sheet abuts against the cover plate; the cover plate is provided with an injection hole passing through the cover plate; the lower plastic sheet is provided with a groove, and the battery liquid filling auxiliary device is provided in the groove; the groove is provided below the injection hole.

[0011] As a preferred embodiment, a protrusion is provided at the center of the bottom of the groove, and the battery liquid filling auxiliary device is sleeved on the protrusion through the through hole; the protrusion is adapted to be arranged in a matching manner with the through hole.

[0012] As a preferred embodiment, the groove wall of the groove includes a plurality of connecting columns arranged at equal intervals, and a second gap is provided between two adjacent connecting columns.

[0013] As a preferred embodiment, one end of each connecting column close to the cover plate abuts against the liquid injection hole; the connecting column, the groove and the lower plastic sheet are all integrally formed.

[0014] As a preferred embodiment, a third gap is provided between each of the connecting columns and the battery filling auxiliary device.

[0015] As a preferred embodiment, a positive electrode column hole is provided at one end of the cover plate, and a negative electrode column hole is provided at the other end, and the injection hole is provided between the positive electrode column hole and the negative electrode column hole; a positive electrode column assembly is provided in the positive electrode column hole, and a negative electrode column assembly is provided in the negative electrode column hole.

[0016] As a preferred embodiment, the cover plate is further provided with an explosion-proof valve hole, which is arranged between the negative electrode hole and the liquid injection hole, and an explosion-proof valve assembly is arranged in the explosion-proof valve hole.

[0017] The beneficial effects achieved by this utility model include: the battery filling auxiliary device of the present application can effectively improve the uniformity of electrolyte infiltration of large-capacity battery electrodes, making the entire filling process quick, simple and convenient. The present application has a simple structure, low cost, and good reliability. It can be produced and used as a general product, meeting the needs of current market products without affecting the safety performance of the cover plate. It also eliminates the need for additional filling equipment, effectively saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0020] Figure 2 This is a structural schematic diagram of a battery top cover structure according to another embodiment of the present invention;

[0021] Figure 3 for Figure 2 Schematic diagram of a partial explosion structure of the battery top cover structure;

[0022] Figure 4 for Figure 2 A schematic cross-sectional view of a battery top cover structure;

[0023] Figure 5 for Figure 2 Schematic diagram of the structure of the lower plastic sheet.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0028] 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.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can 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 present invention.

[0030] like Figure 1 As shown, on the one hand, the embodiment of the utility model proposes the following technical solutions: a battery liquid injection auxiliary device, suitable for a battery top cover structure, comprising a liquid injection auxiliary body 10, wherein a through hole 11 penetrating the liquid injection auxiliary body 10 is provided at the center of the liquid injection auxiliary body 10; a plurality of arc walls 12 are provided on the liquid injection auxiliary body 10, and the plurality of arc walls 12 are evenly arranged around the through hole 11; a first gap 13 is provided between two adjacent arc walls 12; the liquid injection auxiliary body 10 and the plurality of arc walls 12 are integrally formed.

[0031] In the present application, the shape of the liquid injection auxiliary body 10 can be set according to actual needs. It can be disc-shaped or any other shape, and the solution of the present application can be implemented. Specifically, in the present embodiment, the liquid injection auxiliary body 10 is disc-shaped. In addition, the curvature, size and number of the arc walls are adjusted accordingly according to actual use needs. When the battery injection volume is large, the number of arc walls can be increased accordingly, which can make the entire injection process faster, that is, the number of arc walls increases with the increase of the battery injection volume. For example, in the present embodiment, there are 3 arc walls 12, and they are the same size.

[0032] As a preferred embodiment, each of the arc walls 12 is provided with a curvature, and the size of the curvature can be set according to actual needs.

[0033] As a preferred embodiment, a plurality of the arc walls 12 are arranged to enclose and form a gap for accommodating the electrolyte; the gap is respectively connected to the through hole 11 and the first gap 13.

[0034] As a preferred embodiment, a plurality of arc walls 12 are circumferentially arranged on the edge of the liquid injection auxiliary body 10 ; and the through hole 11 and the liquid injection auxiliary body 10 are integrally formed.

[0035] As a preferred embodiment, the liquid injection auxiliary body 10 is adapted to the liquid injection hole of the battery top cover structure. The liquid injection auxiliary device of the present application has no special requirements on the shape of the liquid injection hole and can be applied to liquid injection holes of any shape.

[0036] When the battery is filled with liquid using the structure of the present application, the electrolyte passes through the filling hole and first flows into the battery from the through hole 11 of the filling auxiliary body 10; secondly, part of the electrolyte will accumulate in the filling auxiliary body 10, and this part of the electrolyte will impact the arc wall under the action of pressure to form an electrolyte vortex, which will finally be thrown out of the filling auxiliary device along the curvature of the arc wall and through the first gap between the arc walls and enter the battery, thereby effectively increasing the speed of electrolyte infiltration and ensuring that the battery absorbs the electrolyte evenly.

[0037] On the other hand, Figures 2 to 5 As shown, an embodiment of the present invention further provides a battery top cover structure, including a cover plate 100, a lower plastic sheet 200 and the battery liquid filling auxiliary device 300, wherein the cover plate 100 is arranged on the lower plastic sheet 200, and the lower plastic sheet 200 abuts against the cover plate 100; the cover plate 100 is provided with a liquid filling hole 101 passing through the cover plate 100; the lower plastic sheet 200 is provided with a groove 201, and the battery liquid filling auxiliary device 300 is arranged in the groove 201; the groove 201 is provided below the liquid filling hole 101.

[0038] As a preferred embodiment, a protrusion A is provided at the center of the bottom of the groove 201 , and the battery filling auxiliary device 300 is sleeved on the protrusion A through the through hole 11 ; the protrusion A is adapted to be arranged in a matching manner with the through hole 11 .

[0039] As a preferred embodiment, the groove wall of the groove 201 includes a plurality of connecting pillars B arranged at equal intervals, and a second gap C is provided between two adjacent connecting pillars B.

[0040] As a preferred embodiment, one end of each connecting column B close to the cover plate 100 abuts against the liquid injection hole 101 ; the connecting column B, the groove 201 and the lower plastic sheet 200 are all integrally formed.

[0041] As a preferred embodiment, a third gap D is provided between each connecting column B and the battery filling auxiliary device 300 .

[0042] As a preferred embodiment, a positive electrode column hole (not marked in the figure) is provided at one end of the cover plate 100, and a negative electrode column hole (not marked in the figure) is provided at the other end, and the injection hole 101 is provided between the positive electrode column hole and the negative electrode column hole; a positive electrode column assembly 400 is provided in the positive electrode column hole, and a negative electrode column assembly 500 is provided in the negative electrode column hole.

[0043] As a preferred embodiment, the cover plate 100 is further provided with an explosion-proof valve hole (not marked in the figure), which is arranged between the negative pole hole and the injection hole, and an explosion-proof valve assembly 600 is arranged in the explosion-proof valve hole.

[0044] The battery filling auxiliary device of the present application can effectively improve the uniformity of electrolyte infiltration in large-capacity battery electrodes, making the entire filling process quick, simple and convenient. The present application has a simple structure, low cost, and good reliability. It can be produced and used as a general product to meet the needs of current market products without affecting the safety performance of the cover plate. It also eliminates the need for additional filling equipment, effectively saving costs.

[0045] Throughout this specification, references to terms such as "one embodiment" and "example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example.

[0046] 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.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery filling auxiliary device, characterized in that: Suitable for battery top cover structure, including a liquid injection auxiliary body, a through hole penetrating the liquid injection auxiliary body is provided at the center of the liquid injection auxiliary body; a plurality of arc walls are provided on the liquid injection auxiliary body, and the plurality of arc walls are evenly arranged around the through hole; a first gap is provided between two adjacent arc walls; the liquid injection auxiliary body and the plurality of arc walls are integrally formed.

2. The battery filling auxiliary device according to claim 1, characterized in that: Each of the arc walls is provided with an arc.

3. The battery filling auxiliary device according to claim 1, characterized in that: A plurality of arc walls are enclosed to form a gap for accommodating electrolyte; the gap is respectively connected to the through hole and the first gap.

4. The battery filling auxiliary device according to claim 1, characterized in that: A plurality of arc walls are circumferentially arranged on the edge of the liquid injection auxiliary body; and the through hole and the liquid injection auxiliary body are integrally formed.

5. The battery filling auxiliary device according to claim 1, characterized in that: The liquid injection auxiliary body is adapted to be arranged to fit the liquid injection hole of the battery top cover structure.

6. A battery top cover structure, characterized in that: It comprises a cover plate, a lower plastic sheet and a battery filling auxiliary device according to any one of claims 1 to 5, wherein the cover plate is arranged on the lower plastic sheet, and the lower plastic sheet abuts against the cover plate; the cover plate is provided with a filling hole passing through the cover plate; the lower plastic sheet is provided with a groove, and the battery filling auxiliary device is provided in the groove; the groove is provided below the filling hole.

7. The battery top cover structure according to claim 6, characterized in that: A protrusion is provided at the center of the bottom of the groove, and the battery liquid injection auxiliary device is sleeved on the protrusion through the through hole; the protrusion is adapted to be arranged in a matching manner with the through hole.

8. The battery top cover structure according to claim 6, characterized in that: The groove wall of the groove includes a plurality of connecting columns arranged at equal intervals, and a second gap is provided between two adjacent connecting columns.

9. The battery top cover structure according to claim 8, characterized in that: One end of each connecting column close to the cover plate is in contact with the liquid injection hole; the connecting column, the groove and the lower plastic sheet are all integrally formed.

10. The battery top cover structure according to claim 8, characterized in that: A third gap is provided between each of the connecting columns and the battery filling auxiliary device; One end of the cover plate is provided with a positive electrode post hole, and the other end is provided with a negative electrode post hole, and the injection hole is provided between the positive electrode post hole and the negative electrode post hole; a positive electrode post assembly is provided in the positive electrode post hole, and a negative electrode post assembly is provided in the negative electrode post hole; The cover plate is further provided with an explosion-proof valve hole, which is arranged between the negative pole hole and the liquid injection hole, and an explosion-proof valve assembly is arranged in the explosion-proof valve hole.

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