A sealing device and method for an energy storage battery

Abstract

The present invention provides a sealing device and method for an energy storage battery, comprising: a cover plate mounted on the battery housing, a separator plate disposed between the battery housing and the cover plate, magnetic beads and magnetic balls disposed between the cover plate and the separator plate. The cover plate is provided with a liquid injection hole, and the separator plate is provided with an exhaust hole. The sizes of the magnetic beads and the magnetic balls are both larger than the size of the liquid injection hole, and the size of the magnetic beads is larger than the size of the exhaust hole. The present invention seals the liquid injection hole by using the principle of magnetic attraction; during the working process, when the battery temperature rises to a certain temperature, the magnetic force weakens, the magnetic beads fall off, and the gas inside pushes open the external magnetic ball to discharge the gas. After the exhaust is completed and the temperature drops, when the magnetic force is restored, the magnetic beads and the magnetic balls are attracted to each other again to play a sealing role, extending the service life of the battery and effectively avoiding potential safety hazards.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage batteries, and particularly relates to a sealing device and method for an energy storage battery. Background Art

[0002] With the rise of new energy and its gradual integration into people's lives, the demand for lithium-ion batteries has been continuously increasing. At the same time, the performance requirements for batteries have also been improved, requiring an extended cycle life and a higher battery safety level to ensure safety and durability during use.

[0003] Currently, the sealing method of lithium-ion batteries is laser welding sealing. Such a welding method has high precision requirements and is complex. After such welding is completed, a sealed environment is formed inside the battery. Since the active substances inside the battery will undergo electrochemical reactions and generate gases during charge and discharge, the internal gases cannot be discharged, the internal pressure of the battery > the external pressure, resulting in deformation, and the continuous accumulation of gas volume will pose a safety hazard to the battery. There is also the method of sealing with steel balls. Such a method also requires high precision, and the generated gases cannot be discharged either. In response to the above pressure relief problems, currently, large-capacity batteries all use welded pressure relief valves. When the gas inside the battery accumulates to a certain pressure, the internal air pressure will push open the pressure relief valve for exhaust. After the pressure relief valve is pushed open, external gases will enter the battery, which will have a greater impact on the battery performance and pose a safety hazard, resulting in the scrapping of the battery and shortening the service life of the battery. Summary of the Invention

[0004] The purpose of the present invention is to provide a sealing device and method for an energy storage battery in view of the deficiencies of the prior art. The principle of magnet attraction is used to seal the liquid injection hole; during the working process, when the battery temperature rises to a certain temperature, the magnetic force weakens, the magnet beads fall off, and the internal gas pushes open the external magnetic balls to discharge the gas. After the exhaust is completed and the temperature drops, when the magnetic force is restored, the magnet beads and the magnetic balls are attracted to each other again to play a sealing role, extending the service life of the battery and effectively avoiding safety hazards.

[0005] The specific technical solutions are as follows:

[0006] A sealing device for an energy storage battery includes a cover plate installed on the battery housing, a partition plate disposed between the battery housing and the cover plate, magnet beads and magnetic balls disposed between the cover plate and the partition plate. The cover plate is provided with a liquid injection hole, and the partition plate is provided with an exhaust hole. The sizes of the magnet beads and the magnetic balls are both larger than the size of the liquid injection hole, and the size of the magnet beads is larger than the size of the exhaust hole.

[0007] Optionally, the positions of the exhaust hole and the liquid injection hole correspond to each other.

[0008] Optionally, the sealing device further includes a fixed clamping block and a cap. The fixed clamping block is disposed on the cover plate, and the fixed clamping block covers the outside of the liquid injection hole. The cap is covered on the fixed clamping block, and an air vent hole is formed in the cap.

[0009] Optionally, a positioning groove for accommodating the magnetic beads is formed at a position on the partition plate away from the exhaust hole.

[0010] Optionally, a first arc-shaped guide groove adapted to the magnetic ball is provided on the upper side wall of the liquid injection hole, and a second arc-shaped guide groove adapted to the magnetic bead is provided on the lower side wall of the liquid injection hole.

[0011] Optionally, the cover plate and the partition plate are both made of non-magnetic metal materials.

[0012] A method for sealing an energy storage battery includes the following steps:

[0013] S1. Static placement: The initial position of the magnetic beads is in the positioning groove. After the battery is filled with liquid, it is statically placed. Before static placement, the magnetic beads are moved to the exhaust hole by the magnetic ball to achieve simple sealing and effectively prevent dust from entering the interior of the battery housing.

[0014] S2. Formation: After the battery is statically placed, the magnetic beads are moved to the positioning groove by the magnetic ball above the cover plate. The liquid injection hole is connected to the interior of the cover plate through an exhaust pipe for formation. At the same time, the gas generated during formation is discharged through the exhaust hole and the liquid injection hole in sequence.

[0015] S3. Sealing: After the battery formation is completed, the magnetic beads are moved to the liquid injection hole by the magnetic ball above the cover plate. When the magnetic ball is placed at the liquid injection hole, a sealing penetrant is applied, and then the cap is covered. Under the action of magnetic force, the magnetic beads and the magnetic ball are tightly adsorbed to seal and block the liquid injection hole, preventing the internal and external gases from communicating with each other.

[0016] S4. Exhaust: During the use of the battery, high-temperature gas is generated, which causes the magnetic force between the magnetic beads and the magnetic ball to gradually decrease. When the highest operating temperature of the magnetic beads is reached, the magnetic force between the magnetic beads and the magnetic ball is reduced to the weakest. The internal high-temperature gas is discharged from the exhaust hole, the liquid injection hole, and the air vent hole in sequence. After the high-temperature gas is exhausted, the temperature inside the battery housing decreases, and the magnetic force between the magnetic beads and the magnetic ball is restored to seal the liquid injection hole.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The principle of magnet suction is adopted to seal the liquid injection hole; during the working process, when the battery temperature rises to a certain temperature, the magnetic force weakens, the magnetic beads fall off, the gas inside pushes open the external magnetic balls to discharge the gas, and after the exhaust is over and the temperature drops, when the magnetic force is restored, the magnetic beads and the magnetic balls attract each other again to play a sealing role, extending the service life of the battery and effectively avoiding potential safety hazards. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the battery before standing in the embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the cap in the embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the overall structure of the battery when standing in the embodiment of the present invention.

[0022] In the drawings: 101, vent hole; 102, cap; 103, fixed clamping block; 104, liquid injection hole; 105, isolation plate; 106, exhaust hole; 107, magnetic bead; 108, magnetic ball; 109, cover plate. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0025] Next, the present invention will be further described in conjunction with the drawings and specific embodiments, but it is not a limitation of the present invention.

[0026] The sealing device for an energy storage battery provided by an embodiment of the present invention includes a sealing device provided on a battery housing. The battery housing includes a connecting piece, a plate electrode and a pole column. The connecting piece, the plate electrode and the pole column are sequentially welded at both the positive and negative ends of the battery cell. In this way, the battery cell can be installed inside the battery housing, and the sealing device is hermetically welded on the top of the battery housing to form a battery.

[0027] Refer to Figure 1, the sealing device includes a cover plate 109, a partition plate 105, magnetic beads 107, and magnetic balls 108; the cover plate 109 and the partition plate 105 are both made of non-magnetic metal materials (which can be made of aluminum), and a liquid injection hole 104 penetrating the cover plate 109 is provided at the top of the cover plate 109 (the size of the liquid injection hole 104 is ), and the liquid injection hole 104 is circular; the partition plate 105 is U-shaped, and an exhaust hole 106 is provided on the partition plate 105, and the exhaust hole is strip-shaped (the size of the exhaust hole 106 is ), the upper part of the partition plate 105 is fixedly welded to the cover plate 109, and the cover plate 109 is hermetically welded to the top of the battery case.

[0028] In this embodiment, the magnetic beads 107 are neodymium iron boron magnets (the diameter of the magnetic beads 107 is ), the magnetic beads 107 are placed on the partition plate 105, the magnetic balls 108 are placed on the cover plate 109, and the diameter of the magnetic balls 108 is larger than the width of the liquid injection hole 104, so that the magnetic balls 108 will not fall into the interior of the partition plate 105 from the liquid injection hole 104; when sealing, the magnetic balls 108 are used to move the magnetic beads 107 to the exhaust hole 106, and the simple sealing of the liquid injection hole 104 is realized by the mutual attraction of the magnetic balls 108 and the magnetic beads 107.

[0029] In this embodiment, a positioning groove for accommodating the magnetic beads 107 is provided on the partition plate 105. When welding the partition plate 105 and the cover plate 109, first weld the upper end of the partition plate 105 to the cover plate 109, then place the magnetic beads 107 in the positioning groove, and then weld the cover plate 109 to the cover plate 109, reducing the situation that the magnetic beads 107 fall into the interior of the battery case during the welding process.

[0030] In addition, the positions of the exhaust hole 106 and the liquid injection hole 104 correspond to each other. When injecting electrolyte into the battery, the connecting pipe for injecting electrolyte can be conveniently and quickly inserted into the battery along the liquid injection hole 104 and the exhaust hole 106, reducing the waste of electrolyte.

[0031] In addition, a first arc-shaped guide groove adapted to the magnetic balls 108 is provided on the upper side wall of the liquid injection hole 104, and a second arc-shaped guide groove adapted to the magnetic beads 107 is provided on the lower side wall of the liquid injection hole 104, which can make the magnetic balls 108 and the magnetic beads 107 seal the liquid injection hole 104 more tightly, effectively preventing dust from entering the interior of the battery case.

[0032] Refer to Figure 2 and Figure 3, the sealing device further includes a fixed clamping block 103 and a cap 102. The fixed clamping block 103 is fixedly installed on the cover plate 109, and the fixed clamping block 103 surrounds the outside of the liquid injection hole 104. The cap 102 is covered on the fixed clamping block 103, and an air vent hole 101 is provided on the cap 102. When the active substances inside the battery case undergo an electrochemical reaction and generate gas, causing the internal pressure of the battery to be > the external pressure, the gas can be discharged from the exhaust hole 106, the liquid injection hole 104, and the air vent hole 101 in sequence.

[0033] The sealing method of the energy storage battery provided by the embodiment of the present application includes the following steps:

[0034] S1. Static placement: The initial position of the magnetic bead 107 is in the positioning groove. After the battery is filled with liquid, it is statically placed. Before static placement, the magnetic force ball 108 is used to move the magnetic bead 107 to the liquid injection hole 104 by the mutual attraction between the magnetic force ball 108 and the magnetic bead 107, realizing simple sealing and effectively preventing dust from entering the inside of the battery case.

[0035] S2. Formation: After the battery is statically placed, the magnetic bead 107 is moved to the positioning groove above the cover plate 109 by the magnetic force ball 108, and the liquid injection hole 104 is connected to the inside of the cover plate 109 through the exhaust pipe for formation. At the same time, the gas generated during formation is discharged from the exhaust hole 106 and the liquid injection hole 104 in sequence.

[0036] S3. Sealing: After the battery formation is completed, the magnetic bead 107 is moved to the liquid injection hole 104 above the cover plate 109 by the magnetic force ball 108. When the magnetic force ball 108 is placed at the liquid injection hole 104, a sealing penetrant is applied, and then the cap 102 is covered. Under the action of magnetic force, the magnetic bead 107 and the magnetic force ball 108 are tightly adsorbed to seal and block the liquid injection hole 104, preventing the internal and external gases from communicating with each other.

[0037] S4. Exhaust: During the use of the battery, high-temperature gas is generated, causing the magnetic force between the magnetic bead 107 and the magnetic force ball 108 to gradually decrease. When the highest working temperature of the magnetic bead 107 is reached, the magnetic force between the magnetic bead 107 and the magnetic force ball 108 is reduced to the weakest, and the internal high-temperature gas is discharged from the exhaust hole 106, the liquid injection hole 104, and the air vent hole 101 in sequence. After the high-temperature gas is exhausted, the temperature inside the battery case decreases, and the magnetic force between the magnetic bead 107 and the magnetic force ball 108 is restored to seal the liquid injection hole 104.

[0038] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all the equivalent replacements and obvious changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing method for an energy storage battery, characterized in that, it includes a cover plate installed on the battery housing, a separator plate provided between the battery housing and the cover plate, magnetic beads and magnetic balls provided between the cover plate and the separator plate. The cover plate is provided with a liquid injection hole, and the separator plate is provided with an exhaust hole. The sizes of the magnetic beads and the magnetic balls are both larger than the size of the liquid injection hole, and the size of the magnetic beads is larger than the size of the exhaust hole. A positioning groove for accommodating the magnetic beads is provided at a position on the separator plate far from the exhaust hole. The cover plate is provided with a fixed clamping block, and the fixed clamping block covers the outside of the liquid injection hole. A cap is provided on the fixed clamping block, and an air vent hole is provided on the cap; It further includes the following steps: S1. Static placement: The initial position of the magnetic beads is in the positioning groove. After the battery is filled with liquid, it is statically placed. Before static placement, the magnetic balls are used to move the magnetic beads to the liquid injection hole to achieve simple sealing and effectively prevent dust from entering the interior of the battery housing; S2. Formation: After the battery is statically placed, the magnetic balls are used to move the magnetic beads to the positioning groove above the cover plate. The liquid injection hole is connected to the interior of the cover plate through an exhaust pipe for formation. At the same time, the gas generated during formation is discharged through the exhaust hole and the liquid injection hole in sequence; S3. Sealing: After the battery formation is completed, the magnetic balls are used to move the magnetic beads to the liquid injection hole above the cover plate. The magnetic balls are placed at the liquid injection hole, coated with a sealing penetrant, and the cap is covered. Under the action of magnetic force, the magnetic beads and the magnetic balls are tightly adsorbed to seal and block the liquid injection hole, preventing the communication of internal and external gases; S4. Exhaust: During the use of the battery, high-temperature gas is generated, resulting in a gradual decrease in the magnetic force between the magnetic beads and the magnetic balls. When the highest working temperature of the magnetic beads is reached, the magnetic force between the magnetic beads and the magnetic balls is reduced to the weakest. The internal high-temperature gas is discharged from the exhaust hole, the liquid injection hole, and the air vent hole in sequence. After the high-temperature gas is exhausted, the temperature inside the battery housing decreases, and the magnetic force between the magnetic beads and the magnetic balls is restored to seal the liquid injection hole.

2. A sealing device for the sealing method of an energy storage battery according to claim 1, characterized in that, the positions of the exhaust hole and the liquid injection hole correspond to each other.

3. The sealing device according to claim 2, characterized in that, a first arc-shaped guide groove adapted to the magnetic ball is provided on the upper side wall of the liquid injection hole, and a second arc-shaped guide groove adapted to the magnetic bead is provided on the lower side wall of the liquid injection hole.

4. The sealing device according to claim 2, characterized in that, the materials of the cover plate and the separator plate are both non-magnetic metal materials.

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