A battery electrolyte filling port structure, a battery, and a working method

Abstract

This invention discloses a battery electrolyte filling port structure, a battery, and a working method. The battery electrolyte filling port structure includes a battery cover plate with an electrolyte filling port through hole. Two cavities are provided on the mounting groove around the electrolyte filling port through hole. One end of an elastic element is fixedly connected to each cavity, and the other end of the elastic element is connected to a bracket. The bracket is fixedly connected to the upper surface of a sealing disc, and a horizontal baffle is provided in the middle of the bracket. This structure is built into the cover plate, eliminating the need for additional sealing nails, reducing material costs and alleviating environmental pressure. Furthermore, the horizontal baffle structure helps disperse the electrolyte to both ends of the core. Simultaneously, this structure is designed with an automatic sealing function, maintaining the sealing of the electrolyte filling port after the battery cell is installed, except during the electrolyte filling process, thus avoiding electrolyte loss and risks caused by dust, moisture, impurities, etc.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery manufacturing technology, specifically relating to a battery liquid injection port structure, a battery, and a working method. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] In the manufacturing process of lithium-ion batteries, the electrolyte filling and sealing process usually requires the use of sealing nails to prevent short circuits caused by electrolyte leakage or the entry of foreign objects inside the battery, thereby improving battery safety. At the same time, during the production and transportation of batteries, sealing nails can prevent electrolyte evaporation and leakage, avoiding safety hazards caused by electrolyte leakage.

[0004] Currently, sealing nails are only used in the electrolyte injection and sealing processes, serving as an intermediate step in the sealing process but also bringing several problems. Firstly, there's the cost issue. Sealing nails are disposable consumables, consumed in large quantities during mass battery production, increasing material costs. Secondly, there are issues with production efficiency and product quality. Sealing nails need to be inserted and removed. Automated production adds a dedicated mechanical step for nail placement and removal, while non-automated production requires at least two additional manual steps. This not only increases mechanical or labor costs but also impacts the overall efficiency of the production line. Furthermore, there's a probability of poor sealing during insertion and removal, affecting the entire production schedule and lowering battery performance. Precise control of the sealing nails during production is also crucial; inappropriate pressure or damage to the battery's internal structure can affect battery life, increasing operational and debugging complexity. Finally, there are environmental issues. A significant number of discarded sealing nails are generated on the production line, causing environmental pollution and requiring disposal costs. Summary of the Invention

[0005] The purpose of this invention is to provide a battery filling port structure, battery, and working method, which has an automatic sealing function, eliminates additional process steps, improves production efficiency, and reduces mechanical operation costs or labor costs.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a battery injection port structure, including a battery cover plate, wherein an injection port through hole is provided on the battery cover plate, and two cavities are provided on the mounting groove on the outer periphery of the injection port through hole. One end of an elastic element is fixedly connected to the cavity, and the other end of the elastic element is connected to a bracket. The bracket is fixedly connected to the upper surface of a sealing disc, and a horizontal baffle is provided at the middle position of the bracket. The horizontal baffle is parallel to the sealing disc and spaced at a predetermined distance. The elastic element contracts to drive the sealing disc to seal the injection port.

[0008] As a further technical solution, the two cavities are arranged symmetrically on the same straight line, the shape of the bracket matches the shape of the cavity, and the upper end of the bracket can extend into the cavity.

[0009] As a further technical solution, the diameter of the sealing disc is greater than the inner diameter of the mounting groove, the inner diameter of the mounting groove is greater than the inner diameter of the injection port through hole, and the length of the horizontal baffle is equal to the inner diameter of the injection port through hole.

[0010] As a further technical solution, the bracket, crossbar baffle, and sealing disc are all made of lightweight materials.

[0011] As a further technical solution, a sealing ring is fitted around the circumference of the sealing disc.

[0012] As a further technical solution, the elastic element is a spring. When the spring contracts, the horizontal baffle is located at the stepped surface formed by the injection port and the mounting groove, and the upper surface of the sealing disc is in close contact with the bottom end face of the mounting groove.

[0013] Secondly, embodiments of the present invention provide a battery injection port structure, including a battery cover plate, wherein an injection port through hole is provided on the battery cover plate, and two cavities are provided on the mounting groove on the outer periphery of the injection port through hole. The cavities are under negative pressure, and a bracket is provided in the cavity. The upper end of the bracket is sealed and slidably connected to the inner wall of the cavity, so that the bracket and the cavity form a piston structure. A horizontal baffle is connected to the middle of the bracket, and a sealing disc is connected to the bottom of the bracket. The horizontal baffle is parallel to the sealing disc and is separated by a set distance. Under the action of negative pressure, the sealing disc seals the injection port.

[0014] As a further technical solution, a rubber piston is installed at the upper end of the bracket. Under negative pressure, the upper half of the bracket is located in the cavity, and the height of the bracket accounts for 1 / 2 to 2 / 3 of the height of the cavity.

[0015] Thirdly, embodiments of the present invention provide a battery including the battery filling port structure described in the first or second aspect.

[0016] Fourthly, embodiments of the present invention provide a method for operating a battery filling port structure, comprising:

[0017] Under the action of an elastic element or negative pressure, the sealing disc tightly adheres to the bottom of the injection port to seal it.

[0018] When liquid injection is required, the injection head extends into the liquid injection port through hole. During the extension process, the end of the injection head contacts the horizontal baffle and moves the horizontal baffle and the sealing disc downward by a set distance, so that the liquid injection port through hole is connected to the inside of the battery.

[0019] Electrolyte flows out from the semi-circular gaps on both sides after the injection head contacts the horizontal baffle, thus injecting the electrolyte.

[0020] After the injection is completed, the injection head is removed from the injection port through hole. Under the action of the elastic element or negative pressure, the sealing disc is reset to seal the injection port.

[0021] The beneficial effects of the above embodiments of the present invention are as follows:

[0022] The battery electrolyte filling port structure provided by this invention is built into the cover plate, eliminating the need for additional sealing nails, reducing material costs and alleviating environmental pressure. Simultaneously, this structure design has an automatic sealing function, eliminating additional process steps, improving production efficiency, and reducing mechanical operation costs or labor costs. This structural design can maintain the sealing of the electrolyte filling port after the battery cell is installed, except during the electrolyte filling process, which to a certain extent avoids electrolyte loss and risks and defects caused by dust, moisture, impurities, etc., ensuring the quality of battery cell manufacturing.

[0023] The battery filling port structure provided by this invention achieves automatic sealing of the filling hole by the sealing disc under the elastic force of the elastic element or the principle of negative pressure through the cooperation of multiple structures such as elastic element, bracket, horizontal baffle, sealing disc, mounting groove and cavity. It has the advantages of simple overall structure, easy processing and easy implementation.

[0024] The battery filling port structure provided by this invention can provide a certain degree of obstruction to the filling head as it extends into the filling port, while not obstructing the outflow of electrolyte. In addition, during filling, the electrolyte flows out from the semi-circular gaps on both sides after the filling head contacts the horizontal baffle, which helps to disperse the electrolyte to both sides and facilitates the wetting of the core at both ends of the cover plate, thereby achieving a better wetting effect. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 This is a schematic diagram of the overall structure of the battery liquid injection port structure in Embodiment 1 of the present invention;

[0027] Figure 2 yes Figure 1 Enlarged view of 12 points in the middle;

[0028] Figure 3 This is a three-dimensional perspective view of the battery injection port structure of Embodiment 1 of the present invention;

[0029] Figure 4 This is a schematic diagram of the battery injection port structure of Embodiment 1 of the present invention in the state when the injection head is inserted;

[0030] Figure 5 This is a schematic diagram of the battery filling port structure of Embodiment 1 of the present invention in the state of automatic sealing;

[0031] Figure 6 This is a schematic diagram of the battery liquid injection port structure in Embodiment 2 of the present invention.

[0032] The diagram is for illustrative purposes only.

[0033] Among them, 1. Battery cover plate; 11. Terminal post; 12. Injection port; 13. Explosion-proof valve; 121. Mounting groove; 122. Elastic element; 123. Bracket; 124. Horizontal baffle; 125. Sealing disc; 126. Injection port through hole; 127. Cavity; 128. Vent hole; 2. Injection head. Detailed Implementation

[0034] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0035] Example 1

[0036] In a typical embodiment of the present invention, such as Figures 1-5 As shown, a battery fluid inlet structure is provided, including a battery cover plate 1. The battery cover plate 1 is provided with a fluid inlet through hole 126. Two cavities 127 are provided on the mounting groove 121 on the outer periphery of the fluid inlet through hole 126. One end of an elastic element 122 is fixedly connected to the cavity 127. The other end of the elastic element 122 is connected to a bracket 123. The bracket 123 is fixedly connected to the upper surface of a sealing disc 125. A horizontal baffle 124 is provided in the middle of the bracket 123. The horizontal baffle 124 is parallel to the sealing disc 125 and separated by a set distance. The elastic element 122 contracts to drive the sealing disc to seal the fluid inlet.

[0037] In this embodiment, the two cavities 127 are arranged symmetrically on the same straight line, and the shape of the bracket 123 matches the shape of the cavity 127. The upper end of the bracket 123 can extend into the cavity 127. The length of the bracket 123 extending into the cavity 127 is the upper half of the position where the bracket 123 connects to the horizontal baffle 124.

[0038] In this embodiment, by providing an installation groove 121 at the bottom of the injection port through hole 126, and making the inner diameter of the installation groove 121 larger than the inner diameter of the injection port through hole 126, a stepped surface is formed between the injection port through hole 126 and the installation groove 121. The stepped surface abuts against the upper surface of the horizontal baffle 124. Therefore, the distance between the horizontal baffle 124 and the sealing disc 125 is exactly equal to the height of the installation groove 121. Thus, when the stepped surface abuts against the upper surface of the horizontal baffle 124, the upper surface of the sealing disc 125 abuts against the bottom end face of the installation groove 121.

[0039] Furthermore, the diameter of the sealing disc 125 is larger than the inner diameter of the mounting groove 121, so that under the elastic force of the elastic element, the upper surface of the sealing disc 125 fits exactly with the bottom end face of the mounting groove 121, thereby sealing the injection port 12.

[0040] In this embodiment, the length of the horizontal baffle 124 is equal to the inner diameter of the injection port through hole 126. The horizontal baffle 124 has a certain width, which can play a certain role in blocking the injection head 2 from entering the injection port, while not blocking the flow of electrolyte. In addition, during injection, the electrolyte flows out from the semi-circular gaps on both sides after the injection head contacts the horizontal baffle, which helps to disperse the electrolyte to both sides and helps to wet the core at both ends of the cover plate.

[0041] In this embodiment, the bracket 123 supports the horizontal baffle 124 and the sealing disc 125, and works in conjunction with the cavity 127 to guide the vertical movement of the horizontal baffle 124 and the sealing disc 125. The bracket 123, the horizontal baffle 124 and the sealing disc 125 are all made of lightweight materials, such as plastic, or some lightweight but high-strength materials such as aluminum-lithium alloys, carbon fiber composites, etc. The sealing disc 125 can also be made of other materials such as rubber, silicone, composite materials, etc.

[0042] In this embodiment, a sealing ring is fitted around the circumference of the sealing disc 125 to improve the sealing effect.

[0043] In this embodiment, the elastic element 122 is a spring. When the spring contracts, the horizontal baffle 124 is located at the stepped surface formed by the injection port through hole 126 and the mounting groove 121, and the upper surface of the sealing disc 125 is in close contact with the bottom end face of the mounting groove.

[0044] like Figures 3-5 As shown, when the injection head 2 is inserted, it encounters resistance upon contact with the horizontal baffle 124, causing the slightly tensioned spring to extend further. At this point, the bottom sealing disc moves downwards along with the bracket 123, opening the injection port channel. Electrolyte flows out from the semi-circular gaps on both sides after the injection head 2 contacts the horizontal baffle 124, effectively dispersing the electrolyte to both sides and facilitating the wetting of the core at both ends of the cover plate.

[0045] After the electrolyte filling head is removed, the spring automatically rebounds, causing the bottom sealing plate to move upwards and block the filling port. The spring remains slightly tensioned, providing a sealing force. The filling port structure provided in this embodiment is pre-formed during the battery cover manufacturing process. Once the battery cell is installed in the casing, the filling port is already sealed. The filling port is also sealed promptly before and after filling to prevent adverse effects from dust, moisture, and debris, ensuring the quality of the battery manufacturing process.

[0046] Example 2

[0047] In a typical embodiment of the present invention, a battery electrolyte filling port structure is provided, such as... Figure 6 As shown, the device includes a battery cover plate 1, which has an injection port 126. Two cavities 127 are provided on the mounting groove 121 surrounding the injection port 126. The cavities 127 are under negative pressure. A bracket 123 is installed inside each cavity 127. The upper end of the bracket 123 is sealed to and slidably connected to the inner wall of the cavity 123, forming a piston structure with the cavity 127. A horizontal baffle 124 is connected to the middle of the bracket 123, and a sealing disc 125 is connected to the bottom of the bracket 123. The horizontal baffle 124 and the sealing disc 125 are parallel and spaced a set distance apart. Under negative pressure, the sealing disc 125 seals the injection port 12.

[0048] In this embodiment, a rubber piston is installed at the upper end of the bracket 123. Under negative pressure, the upper half of the bracket is located in the cavity, and the height of the bracket accounts for 1 / 2 to 2 / 3 of the height of the cavity.

[0049] Furthermore, to prevent the support 123 from detaching from the cavity 127 when the injection head presses down on the horizontal baffle 124, a limiting structure can be set between the support and the inner wall of the cavity. For example, a protruding ring can be set at the upper end of the support 123, and an annular groove can be set on the inner wall of the lower part of the cavity. When the support is about to detach from the cavity, the protruding ring will be placed in the groove to prevent the support 123 from detaching from the cavity. Of course, other existing structures can also be used, which will not be described in detail here.

[0050] The difference between the battery filling port structure provided in this embodiment and that in Embodiment 1 is that the elastic element in Embodiment 1 is replaced, and the support is extended and contracted using the principle of air compression. The rest of the structure is the same as that in Embodiment 1, and will not be described again here.

[0051] Specifically, vent holes 128 can be added to the cavities on both sides where the spring was originally placed. The bracket 123 is placed inside the cavity 127, its edge pressed tightly against the inner wall of the cavity. A vacuum device is used to extract some gas through the vent holes until the remaining gas volume is half (or two-thirds) of the original cavity volume. After vacuuming, the vent holes are immediately melted and sealed to ensure a negative pressure inside the cavity. At this time, the air pressure causes the bottom sealing disc 125 to press tightly against the bottom of the injection port, achieving a good sealing effect. When the injection head 2 extends into and touches the horizontal baffle 124, the remaining air in the cavity has a certain stretching space. The downward external force causes the bracket to move down, and the bottom baffle moves down accordingly, opening the injection port. After injection is completed, the injection head is removed, and the air pressure will cause the bracket to slowly and automatically return to its pre-injection position, and the bottom sealing disc 125 returns to the sealing position.

[0052] Example 3

[0053] In a typical embodiment of the present invention, a battery is provided, including the aforementioned battery electrolyte inlet structure, wherein the battery electrolyte inlet structure is disposed on a battery cover plate 1, as shown below. Figure 1 As shown, the battery cover 1 is also equipped with a terminal post 11 and an explosion-proof valve 13.

[0054] Example 4

[0055] In a typical embodiment of the present invention, a method for operating a battery electrolyte filling port structure is provided, comprising:

[0056] Under the action of an elastic element or negative pressure, the sealing disc tightly adheres to the bottom of the injection port to seal it.

[0057] When liquid injection is required, the injection head extends into the liquid injection port through hole. During the extension process, the end of the injection head contacts the horizontal baffle and moves the horizontal baffle and the sealing disc downward by a set distance, so that the liquid injection port through hole is connected to the inside of the battery.

[0058] Electrolyte flows out from the semi-circular gaps on both sides after the injection head contacts the horizontal baffle, thus injecting the electrolyte.

[0059] After the injection is completed, the injection head is removed from the injection port through hole. Under the action of the elastic element or negative pressure, the sealing disc is reset to seal the injection port.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery electrolyte filling port structure, characterized in that, The device includes a battery cover plate with an injection port. Two cavities are provided on the mounting groove around the injection port. One end of an elastic element is fixedly connected to each cavity, and the other end of the elastic element is connected to a bracket. The bracket is fixedly connected to the upper surface of a sealing disc. A horizontal baffle is provided in the middle of the bracket, parallel to and spaced a predetermined distance from the sealing disc. The elastic element contracts, causing the sealing disc to seal the injection port.

2. The battery electrolyte inlet structure as described in claim 1, characterized in that, The two cavities are arranged symmetrically on the same straight line, the shape of the bracket matches the shape of the cavity, and the upper end of the bracket can extend into the cavity.

3. The battery electrolyte inlet structure as described in claim 1, characterized in that, The diameter of the sealing disc is greater than the inner diameter of the mounting groove, the inner diameter of the mounting groove is greater than the inner diameter of the injection port through hole, and the length of the horizontal baffle is equal to the inner diameter of the injection port through hole.

4. The battery electrolyte inlet structure as described in claim 1, characterized in that, The bracket, crossbar baffle, and sealing disc are all made of lightweight materials.

5. The battery electrolyte inlet structure as described in claim 1, characterized in that, A sealing ring is fitted around the circumference of the sealing disc.

6. The battery electrolyte inlet structure as described in claim 1, characterized in that, The elastic element is a spring. When the spring contracts, the horizontal baffle is located at the stepped surface formed by the injection port and the mounting groove, and the upper surface of the sealing disc is in close contact with the bottom end face of the mounting groove.

7. A battery electrolyte filling port structure, characterized in that, The device includes a battery cover plate with an injection port. Two cavities are located on the mounting groove around the injection port, and the cavities are under negative pressure. A bracket is installed within each cavity, with its upper end sealed and slidably connected to the inner wall of the cavity, forming a piston structure. A horizontal baffle is connected to the middle of the bracket, and a sealing disc is connected to the bottom of the bracket. The horizontal baffle is parallel to and spaced a predetermined distance from the sealing disc. Under negative pressure, the sealing disc seals the injection port.

8. The battery electrolyte filling port structure as described in claim 7, characterized in that, A rubber piston is installed at the upper end of the bracket. Under negative pressure, the upper half of the bracket is located in the cavity, and the height of the bracket accounts for 1 / 2 to 2 / 3 of the height of the cavity.

9. A battery, characterized in that, Includes the battery filling port structure as described in claim 1 or 7.

10. A method for operating the battery electrolyte inlet structure as described in claim 1 or 7, characterized in that, include: Under the action of an elastic element or negative pressure, the sealing disc tightly adheres to the bottom of the injection port to seal it. When liquid injection is required, the injection head extends into the liquid injection port through hole. During the extension process, the end of the injection head contacts the horizontal baffle and moves the horizontal baffle and the sealing disc downward by a set distance, so that the liquid injection port through hole is connected to the inside of the battery. Electrolyte flows out from the semi-circular gaps on both sides after the injection head contacts the horizontal baffle, thus injecting the electrolyte. After the injection is completed, the injection head is removed from the injection port through hole. Under the action of the elastic element or negative pressure, the sealing disc is reset to seal the injection port.

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