Lithium battery charging process safety protection device

Abstract

The present invention discloses a full-process safety protection device for lithium battery charging, comprising an explosion-proof housing, a battery, a wiring device, a fire alarm, and a mounting bracket. The battery is mounted within the explosion-proof housing, the mounting bracket is disposed outside the battery, and the fire alarm is mounted above the mounting bracket. The inner side of the explosion-proof housing is coated with a heat-absorbing layer, and the outer side of the explosion-proof housing is coated with an explosion-proof layer. The fire alarm includes an air intake device, a fire alarm body, an internal blowing channel within the fire alarm body, a flute cavity, an inorganic material-filled cavity, a diaphragm, a pressing plate, and a discharge port. The present invention has excellent explosion-proof performance, can sound an alarm even when power is off, has multiple functions, and has low component costs, resulting in low manufacturing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery charging protection, and in particular to a lithium battery charging whole-process safety protection device. Background Art

[0002] When a charger malfunctions due to overcharging or misoperation, abnormal gases often form inside the battery. Because these high-capacity batteries are sealed in containers, the accumulation of these gases can create excessive pressure and heat within the battery, posing a risk of explosion. Large equipment often contains numerous lithium-ion battery packs, and a battery explosion could damage numerous batteries and, in severe cases, even nearby equipment.

[0003] The current lithium battery protection device has the following disadvantages: 1) the explosion-proof effect of the lithium battery protection device is poor;

[0004] 2) Most lithium battery protection devices use temperature detection devices and alarms to detect and alarm the temperature of lithium batteries. However, the temperature detection devices and alarms also need to be powered on to work. Once the battery is abnormal, the temperature detection devices and alarms may be powered off, thus failing to achieve the alarm effect; 3) The manufacturing cost of lithium battery protection devices is high, which is not conducive to large-scale promotion and use; 4) The alarm device of the lithium battery protection device has a single function. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In view of the shortcomings of the existing technology, the present invention provides a lithium battery charging process safety protection device, which has good explosion-proof effect, can also issue an alarm when there is no power, has many functions, and has low cost of each component and low cost.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a lithium battery charging process safety protection device, including an explosion-proof shell, a battery, a wiring device, a fire whistle alarm, and a mounting bracket, the battery is installed inside the explosion-proof shell, the mounting bracket is arranged on the outside of the battery, the fire whistle alarm is installed above the mounting bracket, the wiring device includes an inlet, a charging line, and a fuse, the charging line is connected to the fuse after passing through the inlet, and the fuse is connected to the battery after passing through the mounting bracket, the inner side of the explosion-proof shell is coated with a heat-absorbing layer, the outer side of the explosion-proof shell is coated with an explosion-proof layer, the fire whistle alarm includes an inlet An air device and a fire flute body, an air inlet is provided above the air inlet device, an air inlet cavity is provided inside the air inlet device, the air inlet is connected to the air inlet cavity, the fire flute body has an air blowing channel, a flute cavity, an inorganic material filling cavity, a diaphragm, a pressing plate, and a Di port, the air inlet cavity is respectively connected with the air blowing channel and the inorganic material filling cavity, and a slider is provided at the connection between the air inlet cavity and the air blowing channel and the inorganic material filling cavity, the initial position of the slider blocks the air inlet cavity, the air blowing channel, and the inorganic material filling cavity, a diaphragm is installed between the blowing channel and the flute cavity, a compression spring is provided between the diaphragm and the pressing plate, and the diaphragm is also in contact with the Di port.

[0009] Furthermore, it also includes an electromagnet switch, which is arranged at the junction of the explosion-proof shell and the cover.

[0010] Furthermore, the electromagnetic switch is connected to the fuse through an electric wire.

[0011] Furthermore, it also includes a heat absorbing cover, which is fixed to the fire flute body by bolts and covers the outside of the fire flute body.

[0012] Furthermore, the diameter of the blowing channel is smaller than the diameter of the air inlet cavity.

[0013] Furthermore, the initial position of the head of the slider blocks the air inlet cavity and the air blowing channel, and the initial position of the tail of the slider blocks the inorganic material filling cavity.

[0014] Furthermore, the inorganic material filling cavity is filled with an inorganic material that is converted from solid to liquid at a certain temperature.

[0015] Furthermore, the mounting frame includes a plurality of mounting plates, and each mounting plate is connected by a rotating shaft.

[0016] Furthermore, the explosion-proof housing and the cover are connected via a block or a lock.

[0017] Furthermore, an annular blowing port is provided at the end of the blowing channel, and the annular blowing port is in contact with the diaphragm.

[0018] (3) Beneficial effects

[0019] The present invention provides a lithium battery charging process safety protection device, which has the following beneficial effects:

[0020] 1. The end of the blowing channel of the present invention is provided with an annular blowing port, which contacts the diaphragm. The use of the annular blowing port is more conducive to making the diaphragm emit sound and improving the sound propagation range of the diaphragm.

[0021] 2. In order to concentrate the blowing pressure, the diameter of the blowing channel is smaller than the diameter of the air inlet cavity.

[0022] 3. In order to better protect the fire flute body, the present invention uses a heat absorbing cover to cover the outside of the fire flute body. When the temperature rises, the heat is absorbed by the heat absorbing cover 13.

[0023] 4. The present invention adopts a multiple protection structure design. First, a fire whistle alarm device is used. In the case of battery abnormality, an alarm sound can be issued without power supply. The alarm effect is good and the sound coverage is large, so it can be promoted and used on a large scale. Second, a heat-absorbing layer is coated on the inside of the explosion-proof shell, and an explosion-proof layer is coated on the outside of the explosion-proof shell. In this way, when the battery has thermal runaway, the heat can be absorbed on the one hand, and the battery explosion can be prevented from affecting other components on the other hand, thereby reducing the explosion loss.

[0024] 5. The present invention has a simple structure, low cost of each component, low cost, good explosion-proof effect, and can be widely promoted and used.

[0025] 6. The present invention adopts the design of an electromagnet switch. When the battery is charging normally, the charging line supplies power to the electromagnetic coil in the electromagnet switch, and the electromagnet in the electromagnet switch pops out, pushing the cover 1 open to allow the battery to dissipate heat normally. When the battery is abnormal, the fuse in the wiring device is disconnected, the charging line is cut off, the electromagnet is powered off, and the electromagnet is retracted. The cover falls and locks the explosion-proof housing to prevent the battery explosion from affecting other components.

[0026] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 is a schematic diagram of the mounting bracket of the present invention after installation;

[0029] Figure 3 It is a schematic diagram of the internal structure of the fire whistle alarm of the present invention.

[0030] Figure: 1. Cover; 2. Electromagnet switch; 3. Battery; 4. Explosion-proof housing; 5. Mounting bracket; 6. Fire whistle alarm; 7. Wiring device; 8. Lock; 9. Air inlet; 10. Air inlet device; 11. Air inlet cavity; 12. Diaphragm; 13. Heat absorbing cover; 14. Di port; 15. Fire whistle body; 16. Compression spring; 17. Pressing plate; 18. Inorganic material filling cavity; 19. Slider; 20. Flute cavity; 21. Blowing channel DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0034] See also Figure 1-3The present invention provides a technical solution: a lithium battery charging process safety protection device, including an explosion-proof shell 4, a battery 3, a wiring device 7, a fire whistle alarm 6, a mounting bracket 5, and an electromagnet switch 2. The battery 3 is installed inside the explosion-proof shell 4, the mounting bracket 5 is arranged outside the battery 3, and the fire whistle alarm 6 is installed above the mounting bracket 5. The wiring device 7 includes an inlet, a charging line, and a fuse. The charging line is connected to the fuse after passing through the inlet, and the fuse is connected to the battery 3 after passing through the mounting bracket 5. The inside of the explosion-proof shell 4 is coated with a heat-absorbing layer, and the outside of the explosion-proof shell 4 is coated with an explosion-proof layer. The fire whistle alarm 6 includes an air intake device 10 and a fire whistle body 15. An air intake is provided above the air intake device 10. The air port 9 and the air intake device 10 are provided with an air intake cavity 11 inside, and the air intake port 9 is connected to the air intake cavity 11. The fire flute body 15 is provided with an air blowing channel 21, a flute cavity 20, an inorganic material filling cavity 18, a diaphragm 12, a pressing plate 17, and a fire outlet 14. The air intake cavity 11 is respectively connected with the air blowing channel 21 and the inorganic material filling cavity 18, and a slider 19 is provided at the connection between the air intake cavity 11, the air blowing channel 21, and the inorganic material filling cavity 18. The slider 19 initially blocks the air intake cavity 11, the air blowing channel, and the inorganic material filling cavity 18. A diaphragm 12 is installed between the air blowing channel 21 and the flute cavity 20. A compression spring 16 is provided between the diaphragm 12 and the pressing plate 17. The diaphragm 12 is also in contact with the fire outlet 14. The head of the slider 19 initially blocks the air intake cavity 11 and the air blowing channel, and the tail of the slider 19 initially blocks the inorganic material filling cavity 18. The inorganic material filling cavity 18 is filled with an inorganic material that converts from solid to liquid at a certain temperature (for example, wax. Certain additives can be added to the wax to lower its melting point. The wax is solid at room temperature. When a certain temperature is reached, the wax changes from solid to liquid. It should be noted that the above examples are not intended to limit the scope of protection of the present invention, but are only for better illustrating the principles of the present invention. The inorganic material in the present invention can also be selected from other inorganic materials that convert from solid to liquid at a certain temperature).

[0035] The electromagnetic switch 2 is set at the junction of the explosion-proof housing 4 and the cover 1. The electromagnetic switch 2 is connected to the charging cable through an electric wire. When the cover needs to be opened, the electromagnetic coil in the electromagnetic switch 2 is energized, and the electromagnet inside extends under the action of the magnetic field, pushing the cover open.

[0036] Working principle: When the battery is charging normally, the charging line supplies power to the electromagnetic coil in the electromagnetic switch 2, and the electromagnet in the electromagnetic switch 2 pops out, pushing the cover 1 open, allowing the battery to dissipate heat normally.

[0037] When the battery reaches a certain temperature after charging, the heat absorption layer in the explosion-proof housing 4 begins to absorb heat, the fuse in the wiring device 7 is disconnected, the charging line is cut off, the electromagnet is powered off, and the electromagnet is retracted, and the cover falls to lock the explosion-proof housing 4; at the same time, due to the increase in temperature in the explosion-proof housing 4, the inorganic material in the inorganic material filling cavity 18 changes from solid to liquid, making the volume of the inorganic material smaller, and the slider 19 moves toward the inorganic material filling cavity 18 under the action of pressure, so that the air inlet cavity 11 is connected to the air blowing channel 21, and the hot air is discharged from the air inlet cavity 11. The air port 9 enters the air inlet cavity 11, and then enters the blowing channel 21 from the air inlet cavity 11. The blowing channel 21 then applies pressure to the diaphragm 12. The diaphragm 12 moves downward under the action of the pressure, compressing the compression spring 16. After the diaphragm 12 is pressed down a certain distance, the hot air in the blowing channel 21 flows out from the flute mouth, the pressure decreases, and the compression spring 16 does work, pushing the diaphragm 12 to seal the blowing channel 21. This reciprocating process causes the diaphragm 12 to vibrate, produce a whistle sound, and issue a warning audio signal to remind the staff that the battery is abnormal.

[0038] When the battery experiences thermal runaway and emits high-temperature explosion, the heat absorption layer in the explosion-proof shell 4 begins to absorb heat. The outer side of the explosion-proof shell 4 is coated with an explosion-proof layer to prevent the battery explosion from affecting other components.

[0039] In another embodiment of the present invention, in order to better protect the fire flute body 15, a heat absorbing cover 13 is further included. The heat absorbing cover 13 is fixed to the fire flute body 15 by bolts and covers the outside of the fire flute body 15. When the temperature rises, the heat is absorbed by the heat absorbing cover 13.

[0040] In another embodiment of the present invention, in order to concentrate the blowing pressure, the diameter of the blowing channel is smaller than the diameter of the air inlet cavity 11 .

[0041] In another embodiment of the present invention, in order to facilitate installation and disassembly, the mounting frame 5 includes multiple mounting plates, each of which is connected by a rotating shaft. The schematic diagram of the mounting frame after installation is shown in FIG. Figure 2 shown.

[0042] In another embodiment of the present invention, the explosion-proof housing 4 is connected to the cover 1 via a clamp or lock 8. Since the clamp or lock 8 are conventional components and their principles and structures are well known, they are not described in detail.

[0043] In another embodiment of the present invention, an annular air port is provided at the end of the air blowing channel, and the annular air port contacts the diaphragm 12. The annular air port is more conducive to making the diaphragm 12 emit sound and improving the sound propagation range of the diaphragm 12.

[0044] In the description of the present invention, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery charging whole process safety protection device, comprising an explosion-proof housing (4), characterized in that: The device further comprises a battery (3), a wiring device (7), a fire alarm (6), and a mounting frame (5), wherein the battery (3) is mounted inside the explosion-proof housing (4), the mounting frame (5) is arranged outside the battery (3), the fire alarm (6) is mounted above the mounting frame (5), the wiring device (7) comprises a line inlet, a charging line, and a fuse, the charging line is connected to the fuse after passing through the line inlet, the fuse is connected to the battery (3) after passing through the mounting frame (5), the inner side of the explosion-proof housing (4) is coated with a heat-absorbing layer, and the outer side of the explosion-proof housing (4) is coated with an explosion-proof layer. The fire whistle alarm (6) comprises an air intake device (10) and a fire whistle body (15). An air intake port (9) is provided above the air intake device (10). An air intake cavity (11) is provided inside the air intake device (10). The air intake port (9) is connected to the air intake cavity (11). The fire whistle body (15) comprises an air blowing channel (21), a flute cavity (20), an inorganic material filling cavity (18), a diaphragm (12), a pressing plate (17), and a diaphragm (14). The air intake cavity (11) is connected to the air blowing channel (21) and the inorganic material filling cavity (18), respectively, and the air intake cavity (11) is provided with a slider (19) at the connection point with the blowing channel (21) and the inorganic material filling chamber (18), and the slider (19) blocks the air inlet chamber (11), the blowing channel (21), and the inorganic material filling chamber (18) at its initial position. A diaphragm (12) is installed between the blowing channel (21) and the flute chamber (20), and a compression spring (16) is provided between the diaphragm (12) and the pressing plate (17). The diaphragm (12) is also in contact with the flute mouth (14); the initial position of the head of the slider (19) blocks the air inlet chamber (11) and the blowing channel, and the slider (19) ) at the tail initial position to block the inorganic material filling cavity (18); the inorganic material filling cavity (18) is filled with an inorganic material that is converted from solid to liquid at a certain temperature, and the volume of the inorganic material becomes smaller. The slider (19) moves toward the inorganic material filling cavity (18) under the action of pressure, so that the air inlet cavity (11) is connected to the air blowing channel (21); the end of the air blowing channel is provided with an annular air blowing port, and the annular air blowing port is in contact with the diaphragm (12); and further includes an electromagnet switch (2), and the electromagnet switch (2) is provided at the junction of the explosion-proof housing (4) and the cover (1); When the battery is charged normally, the charging line supplies power to the electromagnetic coil in the electromagnetic switch (2), and the electromagnet in the electromagnetic switch (2) pops out, pushing the cover (1) open, and the battery dissipates heat normally; When the battery reaches a certain temperature after charging, the heat absorption layer in the explosion-proof housing (4) begins to absorb heat, the fuse in the wiring device (7) is disconnected, the charging line is cut off, the electromagnet is powered off, and the electromagnet is retracted, and the cover (1) falls down to lock the explosion-proof housing (4).

2. The lithium battery charging process safety protection device according to claim 1, characterized in that: The electromagnet switch (2) is connected to the fuse via an electric wire.

3. The lithium battery charging process safety protection device according to claim 1, characterized in that: It also includes a heat absorbing cover (13), which is fixed to the fire flute body (15) by bolts and covers the outside of the fire flute body (15).

4. The lithium battery charging process safety protection device according to claim 1, characterized in that: The diameter of the blowing channel is smaller than the diameter of the air inlet cavity (11).

5. The lithium battery charging process safety protection device according to claim 1, characterized in that: The mounting frame (5) comprises a plurality of mounting plates, and each mounting plate is connected via a rotating shaft.

6. The lithium battery charging process safety protection device according to claim 1, characterized in that: The explosion-proof housing (4) and the cover (1) are connected via a block or a lock (8).

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