Battery liquid injection port structure, battery and working method

Abstract

The invention discloses a battery liquid injection port structure, a battery and a working method.The battery liquid injection port structure comprises a battery cover plate, a liquid injection port through hole is formed in the battery cover plate, two cavities are formed in a mounting groove in the periphery of the liquid injection port through hole, one end of an elastic piece is fixedly connected into each cavity, the other end of each elastic piece is connected with a support, and the support is fixedly connected with the battery cover plate. The support is fixedly connected with the upper surface of the sealing disc, and a transverse strip baffle is arranged in the middle of the support. The structure is arranged in the cover plate, extra sealing glue nail consumption is avoided, the material cost is reduced, meanwhile, the environmental protection pressure is relieved, and in addition, the transverse strip baffle structure is beneficial to dispersion of electrolyte towards the roll cores at the two ends; and meanwhile, the structural design has an automatic sealing function, and the liquid injection port can be kept sealed except the liquid injection state after the battery cell enters the shell, so that the loss of electrolyte and risk defects caused by dust, water vapor, impurities and the like are avoided to a certain extent.

Description

Technical Field

[0001] The invention belongs to the technical field of lithium battery manufacturing, and in particular relates to a battery liquid filling port structure, a battery and a working method. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] During the manufacturing process of lithium-ion batteries, the liquid injection and sealing process usually requires the use of sealing nails to prevent short circuits caused by electrolyte leakage or external foreign matter entering the battery, thereby improving the safety of the battery. At the same time, during the production and transportation of the battery, the sealing nails can prevent the electrolyte from volatilizing and leaking, avoiding safety hazards caused by electrolyte leakage.

[0004] At present, sealant nails are only used in the injection and sealing processes. As a sealing transit link, they also bring some problems. The first is the cost issue. Sealant nails are disposable consumables. They will be consumed in large quantities during the mass production of batteries, increasing the material cost of the production process. The second is the production efficiency and product quality issues. Sealant nails need to be plugged in and out. In automated production, mechanical processes specifically for taking and placing sealing nails will be added. Non-automated production also requires at least two steps of manpower investment, which not only increases mechanical or labor costs, but also affects the overall work efficiency of the production line. In addition, there is a probability that the sealant nails will have poor sealing during the plugging and unplugging process, affecting the entire production progress and reducing battery performance. Precise control of the sealant nails during the production process is also very important. Improper pressure and damage inside the battery will also affect the battery life, which increases the difficulty of operation and debugging. Finally, there are some environmental issues involved. There are quite a few discarded sealant nails on the production line, which will cause certain pollution to the environment and require processing costs. Summary of the invention

[0005] The purpose of the present invention is to provide a battery filling port structure, a battery and a working method, which have the function of automatic sealing, eliminate additional process steps, improve production efficiency, and reduce mechanical operation costs or human labor costs.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In the first aspect, an embodiment of the present invention provides a battery filling port structure, including a battery cover, wherein a filling port through hole is arranged on the battery cover, and two cavities are arranged on the mounting groove on the outer periphery of the filling port through hole, one end of an elastic member is fixedly connected in the cavity, and the other end of the elastic member is connected to a bracket, and the bracket is fixedly connected to the upper surface of a sealing disc, and a horizontal baffle is arranged in the middle position of the bracket, and the horizontal baffle is parallel to the sealing disc and separated by a set distance, and the contraction of the elastic member drives the sealing disc to seal the filling port.

[0008] As a further technical solution, the two cavities are on the same straight line and are symmetrically arranged, 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 larger than the inner diameter of the mounting groove, the inner diameter of the mounting groove is larger 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, the horizontal baffle and the sealing disc are all made of lightweight materials.

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

[0012] As a further technical solution, the elastic member is a spring. When the spring contracts, the horizontal baffle is located at the step surface formed by the injection port through hole and the mounting groove, and the upper surface of the sealing disc is tightly fitted with the bottom end surface of the mounting groove.

[0013] In the second aspect, an embodiment of the present invention provides a battery filling port structure, including a battery cover plate, a filling port through hole is arranged on the battery cover plate, two cavities are arranged on the mounting groove on the outer periphery of the filling port through hole, the cavity is under negative pressure, a bracket is arranged in the cavity, the upper end of the bracket is sealed and slidably connected to the inner wall surface of the cavity, so that the bracket and the cavity form a piston structure, the middle part of the bracket is connected to a horizontal baffle, the bottom of the bracket is connected to a sealing disc, the horizontal baffle is parallel to the sealing disc and are separated by a set distance, and the sealing disc seals the filling port under the action of negative pressure.

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

[0015] In a third aspect, an embodiment of the present invention provides a battery, comprising the battery liquid filling port structure described in the first aspect or the second aspect.

[0016] In a fourth aspect, an embodiment of the present invention provides a working method of a battery liquid filling port structure, comprising:

[0017] Under the action of the elastic member or negative pressure, the sealing disc is tightly attached to the bottom of the liquid injection port to seal the liquid injection port;

[0018] When liquid injection is required, the liquid injection head is inserted into the liquid injection port through hole. During the insertion process, the end of the liquid injection head contacts the horizontal baffle plate, and the horizontal baffle plate and the sealing disc are moved downward by a set distance, so that the liquid injection port through hole is connected with the inside of the battery;

[0019] The electrolyte flows out from the semicircular gaps on both sides of the injection head after it contacts the horizontal baffle plate, and the injection is carried out;

[0020] After the liquid injection is completed, the liquid injection head is taken out from the liquid injection port through hole, and under the action of the elastic member or negative pressure, the sealing disc is reset to seal the liquid injection port.

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

[0022] The battery filling port structure provided by the present invention is built into the cover plate, eliminating the consumption of additional sealing nails, reducing material costs and alleviating environmental pressure; at the same time, the structural design has the function of automatic sealing, eliminating additional process steps, improving production efficiency, and reducing mechanical operation costs or human labor costs; the structural design can keep the filling port sealed except for the liquid injection state after the battery cell is put into the shell, avoiding the loss of electrolyte and the risk defects caused by dust, water vapor, impurities, etc. to a certain extent, ensuring the manufacturing effect of the battery cell.

[0023] The battery filling port structure provided by the present invention realizes the automatic sealing effect of the sealing disk on the filling hole under the elastic force of the elastic member or under the action of the negative pressure principle through the mutual cooperation between multiple structures such as the elastic member, the bracket, the horizontal baffle, the sealing disk, the installation groove and the cavity, and has the advantages of simple overall structure, easy processing and easy realization.

[0024] The battery filling port structure provided by the present invention can play a certain blocking role in the process of the filling head extending into the filling port, while not blocking the outflow of electrolyte. In addition, during the injection, the electrolyte flows out from the semicircular gaps on both sides after the filling head contacts the horizontal baffle, thereby achieving the function of helping the electrolyte to disperse to both sides, which is helpful for the infiltration of the winding cores at both ends of the cover plate, thereby obtaining a better infiltration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 is a schematic diagram of the overall structure of the battery liquid filling port structure of Example 1 of the present invention;

[0027] Figure 2 yes Figure 1 A partial enlarged view of location 12;

[0028] Figure 3 is a three-dimensional perspective view of the battery liquid filling port structure of embodiment 1 of the present invention;

[0029] Figure 4 is a schematic diagram of the battery liquid filling port structure of Example 1 of the present invention when the liquid filling head is inserted;

[0030] Figure 5 is a schematic diagram of the battery liquid filling port structure of Example 1 of the present invention when it is automatically sealed;

[0031] Figure 6 It is a schematic diagram of the battery filling port structure of Example 2 of the present invention.

[0032] The schematic diagram is for illustrative purposes only;

[0033] Among them, 1. battery cover; 11. pole; 12. liquid filling port; 13. explosion-proof valve; 121. mounting groove; 122. elastic member; 123. bracket; 124. horizontal baffle; 125. sealing disc; 126. liquid filling port through hole; 127. cavity; 128. vent; 2. liquid filling head. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] Example 1

[0036] In a typical embodiment of the present invention, Figure 1-Figure 5 As shown, a battery filling port structure is provided, including a battery cover 1, wherein the battery cover 1 is provided with a filling port through hole 126, and two cavities 127 are provided on the mounting groove 121 on the outer periphery of the filling port through hole 126, one end of an elastic member 122 is fixedly connected in the cavity 127, and the other end of the elastic member 122 is connected to a bracket 123, and the bracket 123 is fixedly connected to the upper surface of a sealing disc 125, and a horizontal baffle 124 is provided in the middle position of the bracket 123, and the horizontal baffle 124 is parallel to the sealing disc 125 and separated by a set distance, and the elastic member 122 contracts to drive the sealing disc to seal the filling port.

[0037] In this embodiment, the two cavities 127 are symmetrically arranged on the same straight line, the shape of the bracket 123 matches the shape of the cavity 127, and 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, a mounting groove 121 is provided at the bottom of the injection port through hole 126, and the inner diameter of the mounting groove 121 is made larger than the inner diameter of the injection port through hole 126, so that a step surface is formed between the injection port through hole 126 and the mounting groove 121, and the step surface abuts against the upper surface of the horizontal baffle 124. Therefore, the spacing between the horizontal baffle 124 and the sealing disc 125 is exactly equal to the height of the mounting groove 121, so that when the step surface abuts against the upper surface of the horizontal baffle 124, the upper surface of the sealing disc 125 abuts against the bottom end surface of the mounting 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 member, the upper surface of the sealing disc 125 fits exactly with the bottom end surface of the mounting groove 121 , thereby sealing the liquid 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 blocking role in the process of the injection head 2 extending into the injection port, while not blocking the outflow of the electrolyte. In addition, during injection, the electrolyte flows out from the semicircular gaps on both sides after the injection head contacts the horizontal baffle, thereby helping the electrolyte to disperse to both sides, which is helpful for the wetting of the winding cores 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 cooperates with the cavity 127 to guide the up and down 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 materials with smaller mass and higher strength, such as aluminum-lithium alloy and other alloy materials, carbon fiber composite materials, 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 sleeved on the circumference of the sealing disc 125 to improve the sealing effect.

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

[0044] like Figure 3-Figure 5 As shown, when the injection head 2 is inserted into the injection port structure, the injection head 2 contacts the horizontal baffle 124 and resistance occurs, which pulls the spring which is in a slightly stretched state to further extend. At this time, the bottom sealing disc moves down with the bracket 123, and the injection port channel opens. The electrolyte flows out from the semicircular gaps on both sides after the injection head 2 contacts the horizontal baffle 124, which helps the electrolyte to disperse to both sides and helps to wet the winding cores at both ends of the cover plate.

[0045] After the injection head is taken out after injection, the spring will automatically rebound and drive the bottom sealing sheet upward to block the injection port. The spring stays in a slightly open state to provide sealing tension. The injection port structure provided in this embodiment is already built-in when the battery cover is manufactured. The injection port is already in a closed state after the battery cell is placed in the shell. The injection port will also be closed in time before and after injection to prevent adverse effects such as dust, water vapor, and debris from falling, thereby ensuring the quality of the battery manufacturing process.

[0046] Example 2

[0047] In a typical embodiment of the present invention, a battery filling port structure is provided, such as Figure 6 As shown, it includes a battery cover 1, and the battery cover 1 is provided with a liquid injection port through hole 126. Two cavities 127 are provided on the mounting groove 121 on the outer periphery of the liquid injection port through hole 126. The cavity 127 is under negative pressure. A bracket 123 is provided in the cavity 127. The upper end of the bracket 123 is sealed and slidably connected to the inner wall surface of the cavity 123, so that the bracket 123 and the cavity 127 form a piston structure. The middle part of the bracket 123 is connected to a horizontal baffle 124, and the bottom of the bracket 123 is connected to a sealing disc 125. The horizontal baffle 124 is parallel to the sealing disc 125 and is separated by a set distance. Under the action of negative pressure, the sealing disc 125 seals the liquid injection port 12.

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

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

[0050] The battery filling port structure provided in this embodiment is different from that in Embodiment 1 in that the elastic member in Embodiment 1 is replaced, and the air compression principle is used to extend and contract the bracket. The remaining structures are the same as those in Embodiment 1 and will not be described again here.

[0051] Specifically, vents 128 can be added to the cavity parts on both sides where the springs were originally placed, and the bracket 123 is placed in the cavity 127 with the inner edge close to the inner wall of the cavity. A vacuum device is used to absorb part of the gas at the vent until the remaining gas volume is half (or two-thirds) of the original cavity. After the vacuum is completed, the vent is immediately blocked by casting to ensure that there is a negative pressure inside the cavity. At this time, the air pressure drives the bottom sealing disc 125 to be close to the bottom of the injection port to achieve 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, and the downward external force drives the bracket to move downward, and the bottom baffle moves downward accordingly, and the injection port opens. After the injection is completed, the injection head is removed, and the air pressure will drive the bracket to slowly and automatically return to the position before the injection, and the bottom sealing disc 125 returns to the sealing position again.

[0052] Example 3

[0053] In a typical embodiment of the present invention, a battery is provided, including the battery liquid injection port structure, wherein the battery liquid injection port structure is arranged on the battery cover plate 1, such as Figure 1 As shown, the battery cover plate 1 is also provided with a pole 11 and an explosion-proof valve 13 .

[0054] Example 4

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

[0056] Under the action of the elastic member or negative pressure, the sealing disc is tightly attached to the bottom of the liquid injection port to seal the liquid injection port;

[0057] When liquid injection is required, the liquid injection head is inserted into the liquid injection port through hole. During the insertion process, the end of the liquid injection head contacts the horizontal baffle plate, and the horizontal baffle plate and the sealing disc are moved downward by a set distance, so that the liquid injection port through hole is connected with the inside of the battery;

[0058] The electrolyte flows out from the semicircular gaps on both sides of the injection head after it contacts the horizontal baffle plate, and the injection is carried out;

[0059] After the liquid injection is completed, the liquid injection head is taken out from the liquid injection port through hole, and under the action of the elastic member or negative pressure, the sealing disc is reset to seal the liquid injection port.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery filling port structure, characterized in that: It includes a battery cover plate, which is provided with a liquid injection port through hole, and two cavities are provided on the mounting groove on the outer periphery of the liquid injection port through hole, one end of an elastic member is fixedly connected in the cavity, and the other end of the elastic member is connected to a bracket, and the bracket is fixedly connected to the upper surface of a sealing disc, and a horizontal baffle is provided in the middle position of the bracket, and the horizontal baffle is parallel to the sealing disc and separated by a set distance, and the elastic member contracts to drive the sealing disc to seal the liquid injection port.

2. The battery liquid filling port structure according to claim 1, characterized in that: The two cavities are on the same straight line and are symmetrically arranged. 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 liquid filling port structure according to claim 1, characterized in that: The diameter of the sealing disc is larger than the inner diameter of the mounting groove, the inner diameter of the mounting groove is larger than the inner diameter of the liquid injection port through hole, and the length of the horizontal baffle is equal to the inner diameter of the liquid injection port through hole.

4. The battery liquid filling port structure according to claim 1, characterized in that: The bracket, the horizontal baffle plate and the sealing disc are all made of light materials.

5. The battery liquid filling port structure according to claim 1, characterized in that: A sealing ring is sleeved on the circumference of the sealing disc.

6. The battery liquid filling port structure according to claim 1, characterized in that: The elastic member is a spring. When the spring contracts, the horizontal baffle is located at the step surface formed by the liquid injection port through hole and the mounting groove, and the upper surface of the sealing disc is tightly fitted with the bottom end surface of the mounting groove.

7. A battery filling port structure, characterized in that: It includes a battery cover plate, which is provided with a liquid injection port through hole, and two cavities are provided on the mounting groove on the outer periphery of the liquid injection port through hole, and the cavity is under negative pressure. A bracket is provided in the cavity, and the upper end of the bracket is sealed and slidably connected to the inner wall surface of the cavity, so that the bracket and the cavity form a piston structure, the middle part of the bracket is connected to a horizontal baffle, and the bottom of the bracket is connected to a sealing disc, the horizontal baffle is parallel to the sealing disc and is separated by a set distance, and the sealing disc seals the liquid injection port under the action of negative pressure.

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

9. A battery, characterized in that: It comprises the battery liquid filling port structure as described in claim 1 or 7.

10. A method for operating the battery liquid filling port structure according to claim 1 or 7, characterized in that: include: Under the action of the elastic member or negative pressure, the sealing disc is tightly attached to the bottom of the liquid injection port to seal the liquid injection port; When liquid injection is required, the liquid injection head is inserted into the liquid injection port through hole. During the insertion process, the end of the liquid injection head contacts the horizontal baffle plate, and the horizontal baffle plate and the sealing disc are moved downward by a set distance, so that the liquid injection port through hole is connected with the inside of the battery; The electrolyte flows out from the semicircular gaps on both sides of the injection head after it contacts the horizontal baffle plate, and the injection is carried out; After the liquid injection is completed, the liquid injection head is taken out from the liquid injection port through hole, and under the action of the elastic member or negative pressure, the sealing disc is reset to seal the liquid injection port.

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