A liquid injection hole plug

Abstract

This invention relates to the field of energy storage device manufacturing technology and discloses an injection port plug. The injection port plug includes: a plug section, which is at least partially inserted into and blocks the injection port of the energy storage device, and the plug section has a first through hole; and a storage section, which is disposed at the end of the plug section opposite to the injection port, and has a storage cavity formed inside the storage section, which communicates with the first through hole. A second through hole is provided on the side of the storage section opposite to the plug section, and the second through hole communicates with the outside and the storage cavity. The above-disclosed technical solution of this invention reduces the possibility of foreign objects falling into the energy storage device from the injection port because the plug section seals the internal cavity of the energy storage device. Simultaneously, the gas generated during the formation process of the energy storage device can be discharged through the second through hole. When the internal gas pressure of the energy storage device increases during the formation process, potentially causing electrolyte to overflow from the injection port, the electrolyte can enter the storage cavity through the first through hole, effectively preventing electrolyte overflow at high temperatures or negative pressures.

Description

Technical Field

[0001] This invention relates to the field of energy storage device manufacturing technology, and in particular to a liquid injection port plug. Background Technology

[0002] A rechargeable battery, also known as a secondary battery or accumulator, is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. The recyclable nature of rechargeable batteries has made them a primary power source for electrical devices. As the demand for rechargeable batteries increases, so do the performance requirements, especially for cycle life. The electrolyte level is a crucial parameter for ensuring cycle performance; insufficient electrolyte leads to rapid cycle degradation and premature battery lifespan reduction. Conversely, excessive electrolyte can cause battery swelling and damage to the battery's overall structure.

[0003] The existing method of adding electrolyte to a secondary battery involves creating a small hole in the top cover of the battery to form an injection port. Electrolyte is then added to the secondary battery through this injection port. To ensure that the electrolyte thoroughly wets the electrode components inside the secondary battery, it is usually filled completely to improve the battery's cycle performance.

[0004] During high-temperature static formation, the formation of a solid electrolyte interphase (SEI) film on the electrode side releases gas. When the gas is discharged from the injection hole, it causes electrolyte backflow, contaminating the top cover and terminal block of the secondary battery. Furthermore, the exposed injection hole makes it easy for external dust or metal debris and other impurities to enter the secondary battery, causing internal short circuits and affecting the battery's cycle performance and safety performance. Summary of the Invention

[0005] Based on this, the present invention provides an injection hole plug, which can not only reduce the possibility of foreign objects falling into the energy storage device from the injection hole, but also effectively prevent electrolyte from overflowing and contaminating the top cover, electrode post and explosion-proof valve when the electrolyte is at high temperature or negative pressure.

[0006] This invention discloses an injection port plug for an energy storage device having an injection port, the injection port plug comprising:

[0007] A plug section is at least partially inserted into and blocks the liquid injection port of the energy storage device. The plug section is provided with a first through hole, which is used to communicate with the interior of the energy storage device.

[0008] A liquid storage section is provided at one end of the plug section away from the injection hole. A liquid storage cavity is formed inside the liquid storage section and the liquid storage cavity is connected to the first through hole. A second through hole is provided on the side of the liquid storage section away from the plug section and the second through hole is connected to the outside and the liquid storage cavity.

[0009] The liquid injection plug provided by the present invention allows the plug section to be inserted into the liquid injection hole of the energy storage device in at least part, and the first through hole and the second through hole on the plug section are both connected to the liquid storage cavity, thereby realizing the internal communication of the energy storage device with the outside through the first through hole, the liquid storage cavity and the second through hole.

[0010] During the high-temperature settling and formation processes after electrolyte injection in the energy storage device, firstly, the plug section seals the internal cavity of the energy storage device, reducing the possibility of foreign objects falling into the device through the injection hole; secondly, the gas generated during formation can be discharged through the second through hole; thirdly, when the internal gas pressure increases during formation, potentially causing electrolyte to overflow from the injection hole, the electrolyte can enter the storage chamber through the first through hole for temporary storage, effectively preventing electrolyte overflow and contamination of the top cover, electrode, and explosion-proof valve under high temperature or negative pressure. When the internal gas pressure decreases, the electrolyte temporarily stored in the storage chamber is drawn back into the device, eliminating the need for secondary electrolyte replenishment due to excessive liquid loss during formation and effectively simplifying the manufacturing process.

[0011] In one embodiment, the first through hole has a first opening on the side away from the liquid storage section, and a second opening on the side of the first through hole closer to the liquid storage section;

[0012] The second through hole has a third opening on the side near the plug section and a fourth opening on the side away from the plug section; wherein the size of the fourth opening is smaller than the size of the first opening.

[0013] When the injection port plug is fully inserted into the injection port on the energy storage device, the first opening is located inside the energy storage device, and the fourth opening is located outside the energy storage device. Since the size of the fourth opening is smaller than the size of the first opening, this prevents foreign objects from falling into the energy storage device through the fourth opening. At the same time, since the size of the first opening is larger than the size of the fourth opening, it facilitates the passage of electrolyte inside the energy storage device.

[0014] In one embodiment, the first opening is a circular opening with a diameter of D1, and the fourth opening is a circular opening with a diameter of D4, where D1:D4 = 1.05 to 2.25.

[0015] Since the ratio of the diameter D1 of the first opening to the diameter D4 of the fourth opening is between 1.05 and 2.25, it can not only ensure that the electrolyte can pass through the first opening smoothly, but also satisfy the requirement that the size of the fourth opening is small, so that foreign objects are not easy to fall into the storage chamber from the fourth opening and contaminate the electrolyte.

[0016] In one embodiment, the diameter D4 of the fourth opening satisfies: 0.2mm ≤ D4 ≤ 1.45mm, and / or the diameter D1 of the first opening satisfies: 0.21mm ≤ D1 ≤ 3.45mm.

[0017] When the diameter D4 of the fourth opening is 0.2 mm, it can ensure that the gas can pass smoothly through the fourth opening and communicate with the outside air pressure; when the maximum diameter D4 of the fourth opening is 1.45 mm, the opening size of the fourth opening is still small, so foreign objects are not easy to fall into the liquid storage chamber from the fourth opening and contaminate the electrolyte.

[0018] Meanwhile, when the diameter D1 of the first opening 1111 is 0.21mm, it can ensure that the electrolyte can pass through the first opening smoothly; when the maximum diameter D1 of the first opening is 3.45mm, it can avoid the inner diameter of the first through hole being too large and the thickness of the side wall of the plug section being insufficient, which would result in insufficient force against the wall of the injection hole of the energy storage device and affect the sealing effect of the injection hole.

[0019] In one embodiment, the size of the third opening is larger than the size of the first opening.

[0020] Because the size of the third opening is larger than the size of the first opening, and the size of the fourth opening is smaller than the size of the first opening, the size of the fourth opening is also smaller than the size of the third opening. When electrolyte droplets are sprayed upward through the first through hole, they can adhere to the inner wall between the third and fourth openings, preventing electrolyte droplets from being sprayed upward through the fourth opening and wasting electrolyte.

[0021] In one embodiment, the hole segment between the third opening and the fourth opening is tapered, with a larger diameter at the bottom and a smaller diameter at the top.

[0022] Since the section between the third opening and the fourth opening is tapered, wider at the bottom and narrower at the top, when electrolyte droplets are sprayed upwards, they can adhere to the wall of the tapered hole and fall back into the storage chamber, thus avoiding electrolyte waste.

[0023] In one embodiment, the wall thickness L1 of the liquid storage cavity satisfies: 1mm≤L1≤2.85mm.

[0024] Since the walls of the storage chamber are relatively thin and easy to squeeze, the fourth opening can be pinched and the storage chamber squeezed by external force, so that the electrolyte in the storage chamber is squeezed into the energy storage device, accelerating the electrolyte reflux process.

[0025] In one embodiment, the wall thickness of the fourth opening is less than the wall thickness of the liquid storage cavity.

[0026] Because the wall thickness of the fourth opening is relatively thin, it can deform and open when the internal air pressure is high, allowing more gas to pass through per unit time and quickly exhausting the gas. After exhausting the gas, the internal air pressure is basically balanced with the outside air, and the fourth opening contracts and returns to its original position, preventing foreign objects from falling into the liquid storage chamber and contaminating the electrolyte.

[0027] In one embodiment, the liquid storage cavity is spherical; or, the liquid storage cavity is spindle-shaped, with its long side ends located at the second opening and the third opening, respectively.

[0028] This application designs the liquid storage chamber as spherical or spindle-shaped, which makes it difficult for the electrolyte to remain in the liquid storage chamber, and the electrolyte can quickly flow from the inclined surface inside the liquid storage chamber back into the energy storage device.

[0029] In one embodiment, the sidewall of the liquid storage chamber is at least partially made of a transparent material.

[0030] Because the sidewalls of the storage chamber are made of transparent material, operators can easily observe the electrolyte storage status inside the chamber in order to perform operations such as replenishing or draining electrolyte.

[0031] In one embodiment, the injection port plug is made of any one of rubber, polypropylene, or polyethylene.

[0032] Because rubber, polypropylene, or polyethylene are inexpensive and have a certain degree of elasticity, this not only allows the injection hole to be sealed well through the plug section, but also allows the diameter of the second through hole to expand during venting and maintain a small diameter when venting is not required, thereby reducing the possibility of foreign objects falling into the reservoir.

[0033] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects:

[0034] The liquid injection plug provided by the present invention allows the plug section to be inserted into the liquid injection hole of the energy storage device in at least part, and the first through hole and the second through hole on the plug section are both connected to the liquid storage cavity, thereby realizing the internal communication of the energy storage device with the outside through the first through hole, the liquid storage cavity and the second through hole.

[0035] During the high-temperature settling and formation processes after electrolyte injection in the energy storage device, firstly, the plug section seals the internal cavity of the energy storage device, reducing the possibility of foreign objects falling into the device through the injection hole; secondly, the gas generated during formation can be discharged through the second through hole; thirdly, when the internal gas pressure increases during formation, potentially causing electrolyte to overflow from the injection hole, the electrolyte can enter the storage chamber through the first through hole for temporary storage, effectively preventing electrolyte overflow and contamination of the top cover, electrode, and explosion-proof valve under high temperature or negative pressure. When the internal gas pressure decreases, the electrolyte temporarily stored in the storage chamber is drawn back into the device, eliminating the need for secondary electrolyte replenishment due to excessive liquid loss during formation and effectively simplifying the manufacturing process. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of the injection hole plug provided in one embodiment of this application;

[0038] Figure 2 A perspective view of the injection port plug provided in an embodiment of this application.

[0039] Explanation of reference numerals in the attached figures

[0040] 110. Plug section; 111. First through hole; 1111. First opening; 1112. Second opening; 1113. Guide section; 1114. Limiting platform; 120. Liquid storage section; 121. Liquid storage chamber; 122. Second through hole; 1221. Third opening; 1222. Fourth opening. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0043] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0044] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0045] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0046] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0047] Combination Figure 1 and Figure 2 As shown, in one embodiment of this application, an injection port plug 100 is provided for an energy storage device having an injection port. This energy storage device can be, for example, a battery, exemplarily a secondary battery.

[0048] Specifically, the injection port plug 100 includes a plug section 110 and a storage section 120. The plug section 110 is at least partially capable of being inserted into and sealing the injection port of the energy storage device. At the same time, the plug section 110 is provided with a first through hole 111 for communicating with the interior of the energy storage device. The storage section 120 is located at the end of the plug section 110 away from the injection port. A storage cavity 121 is formed inside the storage section 120 and communicates with the first through hole 111. A second through hole 122 is provided on the side of the storage section 120 away from the plug section 110, and the second through hole 122 communicates with the outside and the storage cavity 121.

[0049] It should be noted that the external environment in the embodiments of this application refers to the external space that is different from the interior of the energy storage device. It can be the natural atmospheric environment or other closed or semi-closed liquid injection environment (such as inside the glove box). The external environment may vary depending on the specific liquid injection process requirements of the energy storage device and is not limited here.

[0050] By adopting the above technical solution, since at least a portion of the plug section 110 can be inserted into the liquid injection hole of the energy storage device, and the first through hole 111 and the second through hole 122 on the plug section 110 are both connected to the liquid storage chamber 121, the internal structure of the energy storage device is connected to the outside through the first through hole 111, the liquid storage chamber 121 and the second through hole 122.

[0051] During the high-temperature settling and formation process after electrolyte injection in the energy storage device, firstly, because the plug section 110 seals the internal cavity of the energy storage device, the possibility of foreign objects falling into the energy storage device from the injection hole is reduced. Secondly, the gas generated during the formation process can be discharged through the first through hole 111, the storage chamber 121, and the second through hole 122. Thirdly, when the internal gas pressure of the energy storage device increases during the formation process, which may cause the electrolyte to overflow from the injection hole, the electrolyte can enter the storage chamber 121 through the first through hole 111 for temporary storage, effectively preventing the electrolyte from overflowing and contaminating the top cover, electrode column, and explosion-proof valve at high temperature or negative pressure. When the internal gas pressure of the energy storage device decreases, the electrolyte temporarily stored in the storage chamber 121 is drawn back into the interior of the energy storage device, eliminating the need for secondary electrolyte replenishment due to excessive liquid loss during the formation process, effectively simplifying the manufacturing process of the energy storage device.

[0052] In some embodiments, the injection port plug 100 of this application is made entirely of any one of rubber, polypropylene, or polyethylene. Since rubber, polypropylene, or polyethylene are inexpensive and have a certain degree of elasticity, this not only allows the injection port to be sealed well through the plug section, but also allows the diameter of the second through hole 122 to expand during venting and maintain a small diameter when venting is not required, thereby reducing the possibility of foreign objects falling into the reservoir.

[0053] In some embodiments, to facilitate better insertion of the plug section 110 into the injection port of the energy storage device, such as Figure 1 As shown, the end of the plug section 110 away from the liquid storage chamber 121 is provided with a guide portion 1113, which has a conical structure. In use, when it is necessary to insert the plug section 110 into the liquid injection hole, the conical guide portion 1113 on the plug section 110 can be easily inserted into the liquid injection hole, thereby facilitating the entire plug section 110 to be inserted into the liquid injection hole.

[0054] Furthermore, such as Figure 1 As shown, a limiting platform 1114 is provided on the side of the plug section 110 facing the liquid storage section 120, and the limiting platform 1114 extends radially left and right along the first through hole 111.

[0055] When in use, when the plug section 110 on the injection plug 100 is inserted into the injection hole of the energy storage device, the bottom surface of the limiting platform 1114 abuts against the surface of the energy storage device, thereby making the injection plug 100 stably positioned on the energy storage device.

[0056] In some embodiments, the first through hole 111 can penetrate the plug section 110, wherein the side of the first through hole 111 away from the liquid storage section 120 has a first opening 1111, and the side of the first through hole 111 facing the liquid storage section 120 has a second opening 1112. For example, the first through hole 111 can be a vertical hole, that is, the first opening 1111 and the second opening 1112 can be correspondingly arranged, which facilitates liquid injection and also facilitates the transmission of gas inside the energy storage device through the first opening 1111 to the second opening 1112.

[0057] Furthermore, the second through hole 122 has a third opening 1221 on the side facing the plug section 110, and a fourth opening 1222 on the side away from the plug section 110. The size of the fourth opening 1222 is smaller than the size of the first opening 1111. In this embodiment, since the size of the fourth opening 1222 is smaller than the size of the first opening 1111, when the entire liquid injection plug 100 is inserted into the liquid injection hole on the energy storage device, the first opening 1111 is located inside the energy storage device, and the fourth opening 1222 is located outside the energy storage device. Because the size of the fourth opening 1222 is smaller than the size of the first opening 1111, foreign objects can be prevented from falling into the energy storage device through the fourth opening 1222. At the same time, since the size of the first opening 1111 is larger than the size of the fourth opening 1222, it is convenient for the electrolyte inside the energy storage device to pass through.

[0058] Furthermore, such as Figure 1 As shown, the first opening 1111 in this application is a circular opening with a diameter of D1, and the fourth opening 1222 is a circular opening with a diameter of D4; wherein, D1∶D4=1.05~2.25.

[0059] Since the ratio of the diameter D1 of the first opening 1111 to the diameter D4 of the fourth opening is between 1.05 and 2.25, it can not only ensure that the electrolyte can pass through the first opening 1111 smoothly, but also satisfy the requirement that the size of the fourth opening 1222 is small, so that foreign objects are not easy to fall into the liquid storage chamber 121 from the fourth opening 1222 and contaminate the electrolyte.

[0060] It should be noted that the ratio range of the diameter of the first opening to the diameter of the fourth opening in this embodiment is merely an example, and other ranges can be used in other alternative solutions. For example, D1:D4 = 1.5 to 3, or D1:D4 = 1.8 to 3.5. This application does not impose any special restrictions on the ratio range of the diameter of the first opening to the diameter of the fourth opening, as long as the above ratio range can achieve the purpose of this application.

[0061] In some embodiments, such as Figure 1 As shown, the diameter D4 of the fourth opening 1222 in this application ranges from 0.2mm to 1.45mm. This application limits the diameter D4 of the fourth opening 1222 to between 0.2mm and 1.45mm. When the diameter D4 of the fourth opening 1222 is 0.2mm, it ensures smooth gas flow and communication with the outside environment. When the diameter D4 of the fourth opening 1222 is 0.8mm, it not only ensures communication with the outside environment but also maintains a relatively small overall size. When the maximum diameter D4 of the fourth opening 1222 is 1.45mm, the opening size of the fourth opening 1222 remains small, thus preventing foreign objects from easily falling into the liquid storage chamber 121 and contaminating the electrolyte. It should be noted that the range of the diameter D4 of the fourth opening 1222 in this embodiment is merely an example and can be modified according to the design of the actual product; no special restrictions are imposed here.

[0062] In some embodiments, such as Figure 1As shown, the diameter D1 of the first opening 1111 in this application ranges from 0.21mm to 3.45mm. This application limits the diameter D1 of the first opening 1111 to between 0.21mm and 3.45mm. When the diameter D1 of the first opening 1111 is 0.21mm, it ensures that the electrolyte can pass through smoothly. When the diameter D1 of the first opening 1111 is 2mm, it not only ensures smooth passage of the electrolyte but also prevents the inner diameter of the first through hole from being too large. When the maximum diameter D1 of the first opening 1111 is 3.45mm, it prevents the inner diameter of the first through hole from being too large, which would result in insufficient thickness of the sidewall of the plug section 110, leading to insufficient force against the injection hole wall of the energy storage device and affecting the sealing effect of the injection hole. It should be noted that the range of values ​​for the diameter D1 of the first opening 1111 in this embodiment is only an example and can be changed according to the design of the actual product. No special restrictions are imposed here.

[0063] In some embodiments, reference Figure 1 As shown, the size of the third opening 1221 in this application is larger than the size of the first opening 1111.

[0064] like Figure 1 As shown, since the size of the third opening 1221 is larger than the size of the first opening 1111, and the size of the fourth opening 1222 is smaller than the size of the first opening 1111, the size of the fourth opening 1222 is also smaller than the size of the third opening 1221. When electrolyte droplets are sprayed upward through the first through hole 111, they can adhere to the inner wall between the third opening 1221 and the fourth opening 1222, preventing electrolyte droplets from being sprayed upward through the fourth opening 1222 and wasting electrolyte.

[0065] Furthermore, such as Figure 1 As shown, the aperture section between the third opening 1221 and the fourth opening 1222 in this application is tapered, wider at the bottom and narrower at the top. In this case, when electrolyte droplets splash upwards, they can adhere to the wall of the tapered aperture and fall back into the storage chamber 121, preventing electrolyte waste.

[0066] In some embodiments, reference Figure 1As shown, the wall thickness L1 of the liquid storage chamber 121 in this application ranges from 1mm ≤ L1 ≤ 2.85mm. This application limits the wall thickness L1 of the liquid storage chamber 121 to between 1mm and 2.85mm. When the wall thickness of the liquid storage chamber 121 is 1mm, the overall wall thickness is relatively thin, facilitating compression. When the wall thickness of the liquid storage chamber 121 is 2mm, it not only facilitates compression but also has a certain thickness to prevent scratching during use. When the wall thickness of the liquid storage chamber 121 is 2.85mm, it is still very thin, facilitating compression. During use, the fourth opening 1222 can be pinched with external force to compress the liquid storage chamber 121, causing the electrolyte in the liquid storage chamber 121 to be squeezed into the energy storage device, accelerating the electrolyte reflux process. It should be noted that the range of wall thickness L1 of the liquid storage chamber 121 in this embodiment is only an example; the specific range can be changed according to the design of the actual product, and no special restrictions are imposed here.

[0067] In some embodiments, reference Figure 1 As shown, in this application, the wall thickness of the fourth opening 1222 is less than the wall thickness of the liquid storage cavity 121. The wall thickness L2 of the fourth opening 1222 ranges from 0.1mm ≤ L2 ≤ 1.25mm. This application limits the wall thickness L2 of the fourth opening 1222 to between 0.1mm and 1.25mm. When the wall thickness of the fourth opening 1222 is 0.1mm, the overall wall thickness is relatively thin, facilitating expansion and contraction. When the wall thickness of the fourth opening 1222 is 0.6mm, it not only expands and contracts easily but also has a certain thickness, preventing cracking during expansion. When the wall thickness of the fourth opening 1222 is 1.25mm, it is still relatively thin overall. When the internal air pressure is high, it can deform and open, allowing more gas to pass through per unit time for rapid exhaust. After exhaust, the internal air pressure is basically balanced with the external pressure, and the fourth opening 1222 contracts back to its original position, preventing foreign objects from falling into the liquid storage cavity 121 and contaminating the electrolyte. It should be noted that the range of values ​​for the wall thickness L2 of the fourth opening 1222 in this embodiment is only an example and can be changed according to the design of the actual product. No special restrictions are imposed here.

[0068] In some embodiments, the liquid storage cavity 121 in this application is spherical; or, the liquid storage cavity 121 is spindle-shaped, with the two ends of its long side located at the second opening 1112 and the third opening 1221, respectively.

[0069] like Figure 1 As shown, the liquid storage section 120 in this application may include an intermediate section (the section with the liquid storage cavity 121) and a connecting section (the section with the second through hole 122), wherein the intermediate section is located between the connecting section and the plug section 110, and the connecting section is located above the plug section 110. Furthermore, the intermediate section communicates with the first through hole 111 on the plug section 110.

[0070] During use, when the internal air pressure of the energy storage device decreases, the electrolyte temporarily stored in the storage chamber 121 is drawn back into the energy storage device. At this time, due to the design of the spherical structure in the storage chamber 121, the electrolyte is less likely to remain in the storage chamber 121, and can quickly flow back into the energy storage device from the inclined surface inside the spherical structure. It should be noted that the structural shape of the storage chamber 121 in this embodiment is only an example, and can be changed according to the design of the actual product; no special restrictions are imposed here.

[0071] In some embodiments, the sidewalls of the liquid storage chamber 121 in this application are at least partially made of a transparent material. Because the sidewalls of the liquid storage chamber 121 are made of a transparent material, it is convenient for operators to observe the electrolyte storage status inside the liquid storage chamber 121 in order to perform operations such as replenishing or draining electrolyte.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A liquid injection port plug for an energy storage device having a liquid injection port, characterized in that, The injection port plug (100) includes: A plug section (110) is inserted into and blocks the liquid injection hole of the energy storage device at least partially. The plug section (110) is provided with a first through hole (111), which is used to communicate with the interior of the energy storage device. A liquid storage section (120) is disposed at one end of the plug section (110) away from the injection hole. A liquid storage cavity (121) is formed inside the liquid storage section (120). The liquid storage cavity (121) is connected to the first through hole (111). A second through hole (122) is provided on the side of the liquid storage section (120) away from the plug section (110). The second through hole (122) connects the outside and the liquid storage cavity (121). The first through hole (111) has a first opening (1111) on the side away from the liquid storage section (120), and the first through hole (111) has a second opening (1112) on the side close to the liquid storage section (120). The second through hole (122) has a third opening (1221) on the side near the plug section (110), and a fourth opening (1222) on the side away from the plug section (110); wherein the size of the fourth opening (1222) is smaller than the size of the first opening (1111), the size of the third opening (1221) is larger than the size of the first opening (1111), and the size of the third opening (1221) is larger than the size of the fourth opening (1222), so that the hole section between the third opening (1221) and the fourth opening (1222) is tapered with a larger bottom and a smaller top.

2. The injection port plug according to claim 1, characterized in that, The first opening (1111) is a circular opening with a diameter of D1, and the fourth opening (1222) is a circular opening with a diameter of D4, where D1:D4 = 1.05~2.

25.

3. The injection port plug according to claim 2, characterized in that, The diameter D4 of the fourth opening (1222) satisfies: 0.2mm≤D4≤1.45mm, and / or the diameter D1 of the first opening (1111) satisfies: 0.21mm≤D1≤3.45mm.

4. The injection port plug according to claim 1, characterized in that, The wall thickness L1 of the liquid storage chamber (121) satisfies: 1mm≤L1≤2.85mm.

5. The injection port plug according to claim 4, characterized in that, The wall thickness of the fourth opening (1222) is less than the wall thickness of the liquid storage cavity (121).

6. The injection port plug according to claim 1, characterized in that, The liquid storage cavity (121) is spherical; or, the liquid storage cavity (121) is spindle-shaped, with the two ends of its long side located at the second opening (1112) and the third opening (1221), respectively.

7. The injection port plug according to any one of claims 1-6, characterized in that, The sidewall of the liquid storage chamber (121) is at least partially made of transparent material.

8. The injection port plug according to any one of claims 1-6, characterized in that, The material of the injection port plug includes any one of rubber, polypropylene, or polyethylene.

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