Lithium ion battery liquid injection hole sealing structure

Abstract

The utility model discloses a lithium ion battery liquid injection hole sealing structure, which relates to the technical field of liquid injection hole sealing, and comprises a battery cover plate, a liquid injection hole is formed in the battery cover plate, a rubber plug is clamped in the liquid injection hole, the top end of the rubber plug is connected with a sealing plate, and two ends of the sealing plate are symmetrically connected with connecting blocks. And guide grooves are symmetrically formed in the inner wall of the battery cover plate. Through the arrangement of the connecting block and the arc-shaped groove, in the using process, a worker can clamp the rubber plug and the sealing plate into the liquid injection hole, then the sealing plate is rotated, and therefore the connecting block connected with the side edge of the sealing plate slides by 90 degrees in the arc-shaped groove; according to the battery cover plate sealing device, the sealing plate can be limited, the rectangular plate and the limiting rods are arranged, and after the sealing plate is rotated by 90 degrees, the two sets of limiting rods can be clamped into the battery cover plate, so that the sealing plate is limited again.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid injection hole sealing, in particular to a lithium ion battery liquid injection hole sealing structure. Background Art

[0002] Lithium-ion batteries, also known as lithium batteries, mainly rely on the movement of lithium ions between the positive and negative electrodes to work. Since lithium-ion batteries contain electrolyte, they need to be injected during the production process. At present, in order to inject electrolyte, a small through hole is generally directly processed on the main body of the square aluminum shell lithium-ion battery cover as an injection hole. After the battery is initially injected through the injection hole, the staff needs to temporarily seal the injection hole with a rubber plug, and then perform a normal temperature and high temperature static operation, and then remove the rubber plug for a second injection operation to ensure the accuracy of the electrolyte injection amount. It can be seen that the staff uses the rubber plug to temporarily seal the injection hole.

[0003] At present, the existing rubber plug structure is relatively simple. During use, the staff directly inserts it into the injection hole, and only relies on friction to fix the rubber plug in the injection hole. When the battery is static at high temperature, the pressure inside the battery will increase. When the pressure given to the rubber plug by the internal air pressure is greater than the friction, the rubber plug will be pushed out of the injection hole. At this time, the rubber plug will no longer provide a sealing effect, which may easily cause impurities to enter the battery from the injection hole. For this reason, we propose a lithium-ion battery injection hole sealing structure to solve the above problem. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a sealing structure for a lithium ion battery injection hole.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A lithium-ion battery filling hole sealing structure comprises a battery cover plate, wherein a filling hole is provided inside the battery cover plate, and a rubber plug is engaged inside the filling hole, a sealing plate is connected to the top end of the rubber plug, and connecting blocks are symmetrically connected to the two ends of the sealing plate, and guide grooves are symmetrically provided on the inner wall of the battery cover plate, and an arc groove is provided on the inner wall of the battery cover plate below the guide groove.

[0007] Preferably, rubber rings are symmetrically distributed on the outer side of the rubber stopper, and the cross section of the rubber ring is set to a semicircular structure.

[0008] Preferably, a fixing plate is connected to the top end of the sealing plate, and the fixing plate is configured as a U-shaped structure.

[0009] Preferably, the guide grooves are respectively provided with holes inside, and rectangular plates are clamped inside the holes, the upper side of the rectangular plates are connected to limit rods, the inner wall of the battery cover plate is provided with limit grooves at positions corresponding to the limit rods, and the upper sides of the rectangular plates are respectively connected to vertical rods.

[0010] Preferably, the top end of the vertical rod extends to the outside of the sealing plate, a push rod is provided below the fixed plate, and the lower side of the push rod is fixedly connected to the vertical rod.

[0011] Preferably, the top end of the limiting rod is connected to a connecting rod, and the side wall of the connecting rod is configured as an arc-shaped structure.

[0012] Preferably, the bottom end of the push rod is connected to a spring, a groove is provided at the center position inside the sealing plate, and the inner wall of the groove is connected to the bottom end of the spring.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The device is provided with a connecting block and an arc groove. During use, the staff can engage the rubber plug and the sealing plate into the inside of the injection hole, and then rotate the sealing plate so that the connecting block connected to its side slides ninety degrees inside the arc groove. The arc groove provided by the arc structure can realize the limiting operation of the sealing plate to prevent the sealing plate from being ejected.

[0015] 2. The device is provided with a rectangular plate and a limit rod. After the sealing plate is rotated 90 degrees, the two sets of limit rods can be engaged with the inside of the battery cover, thereby realizing the re-limitation of the sealing plate, so as to effectively prevent the sealing plate from rotating under pressure, thereby ensuring the sealing effect of the sealing plate on the injection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a three-dimensional cross-sectional structure of a lithium-ion battery injection hole sealing structure proposed by the utility model;

[0017] Figure 2 for Figure 1 A three-dimensional schematic diagram of the rubber plug and rubber ring structure;

[0018] Figure 3 for Figure 1 A three-dimensional cross-sectional schematic diagram of the guide groove and arc groove structure;

[0019] Figure 4 for Figure 1 A three-dimensional cross-sectional diagram of the fixed plate and spring structure;

[0020] Figure 5 For the utility model Figure 4 A schematic diagram of the enlarged structure in the middle.

[0021] In the figure: 1. battery cover; 2. injection hole; 3. rubber plug; 4. sealing plate; 5. connecting block; 6. guide groove; 7. arc groove; 8. rectangular plate; 9. limit rod; 10. connecting rod; 11. vertical rod; 12. push rod; 13. spring; 14. fixing plate; 15. rubber ring. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Reference Figure 1-5 A lithium-ion battery injection hole sealing structure comprises a battery cover 1, a liquid injection hole 2 is provided inside the battery cover 1, and a rubber plug 3 is engaged inside the liquid injection hole 2, a sealing plate 4 is connected to the top of the rubber plug 3, and connecting blocks 5 are symmetrically connected to the two ends of the sealing plate 4, a guide groove 6 is symmetrically provided on the inner wall of the battery cover 1, and an arc groove 7 is provided on the inner wall of the battery cover 1 below the guide groove 6, and the normal insertion of the connecting block 5 can be met by the opening of the guide groove 6, and after the rubber plug 3 and the sealing plate 4 are engaged with the inside of the liquid injection hole 2, the staff can rotate the sealing plate 4 ninety degrees, and the arc groove 7 provided by the arc structure can block the sealing plate 4 to prevent the sealing plate 4 from being easily pushed up.

[0024] Further, see Figure 1 and Figure 2 It can be seen that rubber rings 15 are symmetrically distributed on the outside of the rubber stopper 3, and the cross-section of the rubber ring 15 is set to a semicircular structure. When in use, the rubber ring 15 set with a semicircular structure can further ensure the tightness of the rubber stopper 3 to the inside of the injection hole 2.

[0025] Further, see Figure 2 and Figure 3 It can be seen that the top of the sealing plate 4 is connected to a fixing plate 14, and the fixing plate 14 is arranged as a U-shaped structure. The fixing plate 14 arranged through the U-shaped structure can facilitate the staff to quickly pull the sealing plate 4 up and down, thereby effectively improving the convenience of the device when used.

[0026] Further, see Figure 4 and Figure 5It can be known that slots are respectively provided inside the guide groove 6, and rectangular plates 8 are clamped inside the slots, and the upper side of the rectangular plate 8 is connected to a limiting rod 9. The inner wall of the battery cover 1 is provided with a limiting slot at a position corresponding to the limiting rod 9, and the upper side of the rectangular plate 8 is respectively connected to a vertical rod 11. After the sealing plate 4 is clamped into the inside of the injection hole 2, the staff can rotate the sealing plate 4. At this time, the limiting rod 9 can correspond to the limiting slot provided inside the battery cover 1 to achieve the re-limiting of the sealing plate 4.

[0027] Further, see Figure 4 and Figure 5 It can be known that the top end of the vertical rod 11 extends to the outside of the sealing plate 4, a pushing rod 12 is provided under the fixed plate 14, and the lower side of the pushing rod 12 is fixedly connected to the vertical rod 11. Through the setting of the pushing rod 12, it is convenient for the staff to push down the two groups of vertical rods 11 at the same time, which can effectively improve the convenience of using the device.

[0028] Further, see Figure 5 It can be known that the top end of the limit rod 9 is connected to the connecting rod 10, and the side wall of the connecting rod 10 is set as an arc structure. Through the setting of the connecting rod 10, the top end of the limit rod 9 can be protected. Since the top side wall of the connecting rod 10 is set as an arc structure, it can be ensured that it can be smoothly engaged in the limit groove opened inside the battery cover 1.

[0029] Further, see Figure 4 It can be known that the bottom end of the push rod 12 is connected to a spring 13, a groove is provided at the center position inside the sealing plate 4, and the inner wall of the groove is connected to the bottom end of the spring 13. Through the setting of the spring 13, the push rod 12 can be quickly reset when it stops being subjected to pressure, so as to effectively improve the convenience of using the device.

[0030] Working principle: When the utility model is in use, the staff can install the battery cover 1 on the end face of the lithium battery, and inject the electrolyte into the battery through the injection hole 2. After completing the initial injection, the staff can rotate the connecting block 5 connected to the side of the sealing plate 4 to a position corresponding to the guide groove 6, and then the sealing plate 4 and the rubber plug 3 can be snapped into the injection hole 2 together. At this time, the connecting block 5 connected to the side of the sealing plate 4 can be forced to slide downward along the inner wall of the guide groove 6. When the sealing plate 4 cannot be pushed down, the staff can first press down the push rod 12. As a result, the two groups of vertical rods 11 are stressed at the same time, so as to drive the limiting rod 9 to be embedded in the connecting block 5, so as to realize the storage of the limiting rod 9, and then the staff can manually pinch the fixing plate 14 to rotate the sealing plate 4 by ninety degrees. At this time, the positions of the two groups of limiting rods 9 can correspond to the positions of the limiting grooves opened inside the battery cover 1, so that the limiting rod 9 can be lifted up by the elastic force of the spring 13 and snapped into the battery cover 1, so as to realize the re-limitation of the sealing plate 4, and the rubber plug 3 and the sealing plate 4 cooperate with each other to realize the sealing of the injection hole 2;

[0031] When a secondary liquid injection operation is required, the staff can first press the push rod 12 downward to pull the two sets of limit rods 9 out of the limit grooves, and then rotate the fixing plate 14 ninety degrees in the opposite direction to make the positions of the two sets of connecting blocks 5 correspond to the guide grooves 6. At this time, the staff can pull up the sealing plate 4 to remove it together with the rubber plug 3 from the inside of the liquid injection hole 2. The above is the entire working principle of the utility model.

[0032] In the present invention, the installation method, connection method or setting method of all the components mentioned above are common mechanical methods, and the specific structures, models and coefficient indicators of all its components are its own technology. As long as it can achieve its beneficial effects, it can be implemented, so it will not be elaborated.

[0033] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

[0034] In the present utility model, unless otherwise stated, the directional words contained in the terms such as "up, down, left, right, front, back, inside, outside, vertical, horizontal" only represent the orientation of the term in normal use, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, number series nouns such as "first", "second" and "third" do not represent specific quantities and orders, but are merely used to distinguish names. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A lithium-ion battery injection hole sealing structure, comprising a battery cover plate (1), characterized in that: The battery cover (1) is provided with a liquid injection hole (2) inside, and a rubber plug (3) is engaged inside the liquid injection hole (2), the top end of the rubber plug (3) is connected to a sealing plate (4), and the two ends of the sealing plate (4) are symmetrically connected to connecting blocks (5), the inner wall of the battery cover (1) is symmetrically provided with guide grooves (6), and the inner wall of the battery cover (1) below the guide grooves (6) is provided with an arc groove (7).

2. A lithium-ion battery injection hole sealing structure according to claim 1, characterized in that: The outer side of the rubber stopper (3) is symmetrically provided with rubber rings (15), and the cross section of the rubber ring (15) is arranged in a semicircular structure.

3. A lithium-ion battery injection hole sealing structure according to claim 1, characterized in that: The top end of the sealing plate (4) is connected to a fixing plate (14), and the fixing plate (14) is configured as a U-shaped structure.

4. A lithium-ion battery injection hole sealing structure according to claim 3, characterized in that: The guide grooves (6) are respectively provided with slot holes inside, and rectangular plates (8) are clamped inside the slot holes. The upper side of the rectangular plates (8) is connected to a limiting rod (9). The inner wall of the battery cover (1) is provided with limiting slots at positions corresponding to the limiting rod (9), and the upper side of the rectangular plates (8) is respectively connected to vertical rods (11).

5. A lithium-ion battery injection hole sealing structure according to claim 4, characterized in that: The top end of the vertical rod (11) extends to the outside of the sealing plate (4), a push rod (12) is provided below the fixed plate (14), and the lower side of the push rod (12) is fixedly connected to the vertical rod (11).

6. A lithium-ion battery injection hole sealing structure according to claim 4, characterized in that: The top end of the limiting rod (9) is connected to a connecting rod (10), and the side wall of the connecting rod (10) is arranged as an arc-shaped structure.

7. A lithium-ion battery injection hole sealing structure according to claim 5, characterized in that: The bottom end of the push rod (12) is connected to a spring (13), a groove is provided at the center position inside the sealing plate (4), and the inner wall of the groove is connected to the bottom end of the spring (13).

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