A lithium battery with a flame-retardant structure

Abstract

This invention relates to the field of lithium battery technology, specifically disclosing a lithium battery with a flame-retardant structure, including a battery outer shell, a battery inner shell disposed inside the battery outer shell, and a partition cavity formed between the battery outer shell and the battery inner shell. The partition cavity contains a flame-retardant material that prevents combustion. It also includes a control device for controlling the connection between the battery inner shell and the partition cavity. This invention, by providing a battery outer shell and a battery inner shell for storing the battery, forming a partition cavity between the battery outer shell and the battery inner shell, and containing a flame-retardant material inside the partition cavity, and by providing a control device for controlling the connection between the battery inner shell and the partition cavity, allows the flame-retardant material to enter the battery inner shell and prevent combustion of the battery inside the battery inner shell when the lithium battery is in a fire environment or is itself burning. This effectively improves the flame-retardant capability of the lithium battery and increases its safety performance.

Description

Technical Field

[0001] This invention specifically relates to the field of lithium battery technology, and more specifically to a lithium battery with a flame-retardant structure. Background Technology

[0002] With the rapid development of my country's economy and industrialization, a series of environmental problems have emerged. Energy crisis and environmental pollution have become significant constraints on my country's development. Therefore, adjusting the energy structure and promoting innovation in energy storage technology have become key national development strategies. Lithium-ion batteries are one of the most important technologies in the energy storage field, with wide applications in photovoltaic power generation and electric vehicles.

[0003] Lithium-ion batteries are batteries that contain lithium (including metallic lithium, lithium alloys, lithium ions, and lithium polymers) in their electrochemical system. They can be broadly classified into two categories: lithium metal batteries and lithium-ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable. The fifth generation of rechargeable batteries, lithium metal batteries, was developed in 1996. Their safety, specific capacity, self-discharge rate, and performance-price ratio are superior to lithium-ion batteries. Due to their high technological requirements, only companies in a few countries currently produce lithium metal batteries. Since the advent of smartphones in 2007, followed by tablet computers, the world has entered the era of intelligent technology. The strong demand for smartphones and tablets has rapidly driven sales of digital lithium batteries, with mobile phone lithium batteries accounting for the largest share. According to statistics, in 2012, the market size of finished lithium battery packs in my country's new energy vehicles, grid energy storage, special vehicles, and communication base stations reached 3.5 billion yuan, a 34.6% increase from 2.6 billion yuan in 2011. New energy vehicles accounted for 57% of this market. The rapid adjustment of the product structure in the digital lithium battery industry in 2012 led to a rapid increase in sales of soft-pack lithium batteries and cylindrical lithium batteries, maintaining a growth rate of over 30%. On the other hand, it caused the market size of aluminum-cased square lithium batteries to shrink rapidly.

[0004] Lithium batteries have certain temperature requirements when in use. If a fire occurs in the outside environment, the lithium battery may burn or explode due to excessive temperature, posing a certain safety hazard. Summary of the Invention

[0005] The purpose of this invention is to provide a lithium battery with a flame-retardant structure to solve the problem mentioned in the background art that lithium batteries have certain temperature requirements during use, and that if a fire occurs in the outside, the lithium battery will burn or explode due to excessive temperature, which poses certain safety hazards.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A lithium battery with a flame-retardant structure includes a battery outer shell and a battery inner shell disposed inside the battery outer shell. The battery inner shell is used to store the battery. A partition cavity is formed between the battery outer shell and the battery inner shell. The partition cavity contains a flame-retardant material that prevents combustion.

[0008] It also includes a control device for controlling the connection between the battery inner shell and the partition cavity. When the lithium battery is in a fire environment or is burning itself, the control device controls the connection between the battery inner shell and the partition cavity to allow flame-retardant material to enter the battery inner shell and prevent the battery in the battery inner shell from burning.

[0009] As a further aspect of the present invention: the control device includes a one-way valve installed on the inner shell of the battery, a fire detection sensor installed on the outer shell of the battery, and a controller. The fire detection sensor is connected to the controller, and the controller is connected to the one-way valve. In the initial state, the gas pressure of the flame-retardant gas inside the lower cavity is balanced with the gravity of the flame-retardant powder inside the upper cavity. The first and second lifting slides are located on the upper side of the partition cavity. At this time, the volume of the lower cavity is larger than the volume of the upper cavity. When a fire occurs, the one-way valve opens, and the flame-retardant gas enters the inner shell of the battery. After the flame-retardant powder loses its pressure resistance, it drives the first and second lifting slides to slide down, finally reaching the bottom of the partition cavity and blocking the one-way valve, thereby forming a sealed flame-retardant space inside the inner shell of the battery to protect the battery.

[0010] As a further embodiment of the present invention: the battery casing has an installation cavity inside, the battery inner shell is fixedly installed inside the installation cavity, and the partition cavity is formed between the battery inner shell and the battery casing.

[0011] As a further embodiment of the present invention: at least one battery is stored inside the battery inner shell. In this embodiment of the present invention, the battery is a lithium battery. The battery is mounted in the battery inner shell by a mounting base. The mounting base is provided with a power cable for connecting the battery. One end of the power cable is electrically connected to the battery.

[0012] As a further embodiment of the present invention: a wiring panel is installed on the battery casing, the wiring panel is provided with at least one wiring hole and a power switch, and the wiring hole and the power switch are electrically connected to the power cable.

[0013] As a further embodiment of the present invention: a first lifting slide plate and a second lifting slide plate are slidably installed on the left and right sides of the partition cavity, respectively, and the first lifting slide plate and the second lifting slide plate are slidably connected to and tightly fitted to the inner wall of the partition cavity.

[0014] As a further embodiment of the present invention: the first and second lifting slide plates divide the interior of the partition cavity into an upper cavity and a lower cavity. The upper cavity stores flame-retardant powder, and the lower cavity stores the flame-retardant substance, which is a flame-retardant gas.

[0015] As a further aspect of the present invention: the battery casing is provided with an air inlet, which is connected to the interior of the partition cavity for introducing flame-retardant gas into the interior of the partition cavity.

[0016] As a further embodiment of the present invention: a cutter is slidably mounted inside the battery inner shell above the power cable. The cutter is made of iron. A magnet that cooperates with the cutter is fixedly mounted on the second lifting slide plate. When the second lifting slide plate is in the initial equilibrium position, the second lifting slide plate drives the cutter to remain stationary above the battery inner shell. When a fire occurs, the second lifting slide plate slides downwards, driving the cutter downwards at the same time, causing the cutter to cut the power cable and block the installation channel of the power cable, so that a sealed flame-retardant space is formed inside the battery inner shell.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a battery outer shell and a battery inner shell for storing the battery, with a partition cavity formed between the battery outer shell and the battery inner shell. The partition cavity contains a flame-retardant material that prevents combustion. It also provides a control device for controlling the connection between the battery inner shell and the partition cavity. When the lithium battery is in a fire environment or is burning itself, the control device controls the connection between the battery inner shell and the partition cavity, allowing the flame-retardant material to enter the battery inner shell and prevent the battery in the battery inner shell from burning. This effectively improves the flame-retardant ability of the lithium battery and increases the safety performance of the lithium battery. Attached Figure Description

[0018] Figure 1 A schematic diagram of a lithium battery with a flame-retardant structure. Figure 1 .

[0019] Figure 2 A schematic diagram of a lithium battery with a flame-retardant structure. Figure 2 .

[0020] Figure 3 This is a cross-sectional view of a lithium battery with a flame-retardant structure.

[0021] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0022] In the diagram: 10-Battery casing, 11-Armored casing, 12-Mounting cavity, 13-Air inlet, 20-Wiring panel, 21-Wiring hole, 22-Power switch, 30-Battery inner casing, 31-Battery, 32-Mounting base, 33-Power cable, 34-One-way valve, 40-Separation cavity, 41-Flame retardant powder, 42-Flame retardant gas, 43-First lifting slide plate, 44-Second lifting slide plate, 50-Cutter. Detailed Implementation

[0023] 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.

[0024] Example 1

[0025] Please see Figure 1-3 In this embodiment of the invention, a lithium battery with a flame-retardant structure includes a battery outer shell 10 and a battery inner shell 30 disposed inside the battery outer shell 10. The battery inner shell 30 is used to store a battery 31. A partition cavity 40 is formed between the battery outer shell 10 and the battery inner shell 30. The partition cavity 40 contains a flame-retardant material that prevents combustion. When the lithium battery is in a fire environment or burns itself, the battery inner shell 30 and the partition cavity 40 are connected to allow the flame-retardant material to enter the battery inner shell 30 and prevent the battery 31 in the battery inner shell 30 from burning.

[0026] In this embodiment of the invention, a control device is also included to control the connection between the battery inner shell 30 and the partition cavity 40. The control device includes a one-way valve 34 installed on the battery inner shell 30, a fire detection sensor installed on the battery outer shell 10, and a controller. The fire detection sensor is connected to the controller, and the controller is connected to the one-way valve 34. When the fire detection sensor detects a fire, it sends a fire signal to the controller. After receiving the fire signal, the controller opens the one-way valve 34 to allow the flame-retardant material to enter the interior of the battery inner shell 30. It can be understood that, in this embodiment of the invention, the conduction direction of the one-way valve 34 is from the partition cavity 40 to the battery inner shell 30.

[0027] In embodiments of the present invention, such as Figure 3 As shown, the battery casing 10 has an installation cavity 12 inside, the battery inner casing 30 is fixedly installed inside the installation cavity 12, and the partition cavity 40 is formed between the battery inner casing 30 and the battery casing 10.

[0028] Furthermore, at least one battery 31 is stored inside the battery inner shell 30. In this embodiment of the invention, the battery 31 is a lithium battery. The battery 31 is disposed in the battery inner shell 30 through a mounting base 32. The mounting base 32 is provided with a power cable 33 for connecting the battery 31. One end of the power cable 33 is electrically connected to the battery 31.

[0029] Furthermore, in this embodiment of the invention, a wiring panel 20 is installed on the battery casing 10. The wiring panel 20 is provided with at least one wiring hole 21 and a power switch 22. The wiring hole 21 and the power switch 22 are electrically connected to the power cable 33, and the battery 31 supplies power to the wiring hole 21 and the power switch 22 through the power cable 33.

[0030] Please refer to it again. Figure 3 In this embodiment of the invention, a first lifting slide plate 43 and a second lifting slide plate 44 are slidably installed on the left and right sides of the partition cavity 40, respectively. The first lifting slide plate 43 and the second lifting slide plate 44 are slidably connected to and tightly fitted with the inner wall of the partition cavity 40 to ensure the airtightness of the partition cavity 40 on both sides of the first and second lifting slide plates 43 and 44.

[0031] The first lifting slide plate 43 and the second lifting slide plate 44 divide the interior of the partition cavity 40 into an upper cavity and a lower cavity. The upper cavity stores flame retardant powder 41, and the lower cavity stores the flame retardant substance, which is flame retardant gas 42. In the initial state, the gas pressure of the flame retardant gas 42 in the lower cavity is balanced with the gravity of the flame retardant powder 41 in the upper cavity. The first lifting slide plate 43 and the second lifting slide plate 44 are located on the upper side of the partition cavity 40. At this time, the volume of the lower cavity is larger than that of the upper cavity. When a fire occurs, the one-way valve 34 opens, and the flame retardant gas 42 enters the battery inner shell 30. After the flame retardant powder 42 loses the pressure resistance, it drives the first lifting slide plate 43 and the second lifting slide plate 44 to slide down, finally reaching the bottom of the partition cavity 40 and blocking the one-way valve 34, thereby forming a sealed flame retardant space inside the battery inner shell 30 to protect the battery 31.

[0032] In addition, in this embodiment of the invention, in order to enable the flame-retardant gas 42 to quickly enter the inner casing 30 of the battery, the air pressure inside the inner casing 30 is less than the air pressure inside the partition cavity 40; furthermore, the outer casing 10 of the battery is provided with an air inlet 13, which communicates with the interior of the partition cavity 40 and is used to introduce the flame-retardant gas 42 into the interior of the partition cavity 40.

[0033] Furthermore, the battery casing 10 is also provided with an armored shell 11 for protection.

[0034] Example 2

[0035] Please see Figure 1-3 In this embodiment of the invention, a lithium battery with a flame-retardant structure includes a battery outer shell 10 and a battery inner shell 30 disposed inside the battery outer shell 10. The battery inner shell 30 is used to store a battery 31. A partition cavity 40 is formed between the battery outer shell 10 and the battery inner shell 30. The partition cavity 40 contains a flame-retardant material that prevents combustion. When the lithium battery is in a fire environment or burns itself, the battery inner shell 30 and the partition cavity 40 are connected to allow the flame-retardant material to enter the battery inner shell 30 and prevent the battery 31 in the battery inner shell 30 from burning.

[0036] In this embodiment of the invention, a control device is also included to control the connection between the battery inner shell 30 and the partition cavity 40. The control device includes a one-way valve 34 installed on the battery inner shell 30, a fire detection sensor installed on the battery outer shell 10, and a controller. The fire detection sensor is connected to the controller, and the controller is connected to the one-way valve 34. When the fire detection sensor detects a fire, it sends a fire signal to the controller. After receiving the fire signal, the controller opens the one-way valve 34 to allow the flame-retardant material to enter the interior of the battery inner shell 30. It can be understood that, in this embodiment of the invention, the conduction direction of the one-way valve 34 is from the partition cavity 40 to the battery inner shell 30.

[0037] In embodiments of the present invention, such as Figure 3 As shown, the battery casing 10 has an installation cavity 12 inside, the battery inner casing 30 is fixedly installed inside the installation cavity 12, and the partition cavity 40 is formed between the battery inner casing 30 and the battery casing 10.

[0038] Furthermore, at least one battery 31 is stored inside the battery inner shell 30. In this embodiment of the invention, the battery 31 is a lithium battery. The battery 31 is disposed in the battery inner shell 30 through a mounting base 32. The mounting base 32 is provided with a power cable 33 for connecting the battery 31. One end of the power cable 33 is electrically connected to the battery 31.

[0039] Furthermore, in this embodiment of the invention, a wiring panel 20 is installed on the battery casing 10. The wiring panel 20 is provided with at least one wiring hole 21 and a power switch 22. The wiring hole 21 and the power switch 22 are electrically connected to the power cable 33, and the battery 31 supplies power to the wiring hole 21 and the power switch 22 through the power cable 33.

[0040] Please refer to it again. Figure 3In this embodiment of the invention, a first lifting slide plate 43 and a second lifting slide plate 44 are slidably installed on the left and right sides of the partition cavity 40, respectively. The first lifting slide plate 43 and the second lifting slide plate 44 are slidably connected to and tightly fitted with the inner wall of the partition cavity 40 to ensure the airtightness of the partition cavity 40 on both sides of the first and second lifting slide plates 43 and 44.

[0041] The first lifting slide plate 43 and the second lifting slide plate 44 divide the interior of the partition cavity 40 into an upper cavity and a lower cavity. The upper cavity stores flame retardant powder 41, and the lower cavity stores the flame retardant substance, which is flame retardant gas 42. In the initial state, the gas pressure of the flame retardant gas 42 in the lower cavity is balanced with the gravity of the flame retardant powder 41 in the upper cavity. The first lifting slide plate 43 and the second lifting slide plate 44 are located on the upper side of the partition cavity 40. At this time, the volume of the lower cavity is larger than that of the upper cavity. When a fire occurs, the one-way valve 34 opens, and the flame retardant gas 42 enters the battery inner shell 30. After the flame retardant powder 42 loses the pressure resistance, it drives the first lifting slide plate 43 and the second lifting slide plate 44 to slide down, finally reaching the bottom of the partition cavity 40 and blocking the one-way valve 34, thereby forming a sealed flame retardant space inside the battery inner shell 30 to protect the battery 31.

[0042] In addition, in this embodiment of the invention, in order to enable the flame-retardant gas 42 to quickly enter the inner casing 30 of the battery, the air pressure inside the inner casing 30 is less than the air pressure inside the partition cavity 40; furthermore, the outer casing 10 of the battery is provided with an air inlet 13, which communicates with the interior of the partition cavity 40 and is used to introduce the flame-retardant gas 42 into the interior of the partition cavity 40.

[0043] Furthermore, the battery casing 10 is also provided with an armored shell 11 for protection.

[0044] Please see Figure 3-4 The difference between this embodiment and Embodiment 1 is that:

[0045] Inside the battery inner shell 30, above the power cable 33, a cutter 50 is slidably mounted. The cutter 50 is made of iron. A magnet that cooperates with the cutter 50 is fixedly mounted on the second lifting slide plate 44. When the second lifting slide plate 44 is in the initial equilibrium position, the second lifting slide plate 44 drives the cutter 50 to remain stationary above the battery inner shell 30. When a fire occurs, the second lifting slide plate 44 slides downward, driving the cutter 50 to slide downward, causing the cutter 50 to cut the power cable 33 and block the installation channel of the power cable 33, so that a sealed flame-retardant space is formed inside the battery inner shell 30.

[0046] In summary, this invention provides a battery outer shell and a battery inner shell for storing the battery, with a partition cavity formed between them. The partition cavity contains a flame-retardant material to prevent combustion. Furthermore, it includes a control device to control the connection between the battery inner shell and the partition cavity. When the lithium battery is in a fire environment or is burning itself, the control device controls the connection between the battery inner shell and the partition cavity, allowing the flame-retardant material to enter the battery inner shell and prevent the battery inside from burning. This effectively improves the flame-retardant capability of the lithium battery and enhances its safety performance.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lithium battery with a flame-retardant structure, characterized in that, Includes a battery casing (10) and a battery inner casing (30) disposed inside the battery casing (10). The battery inner casing (30) is used to store a battery (31). A partition cavity (40) is formed between the battery casing (10) and the battery inner casing (30). The partition cavity (40) contains a flame-retardant substance that prevents combustion. It also includes a control device for controlling the connection between the battery inner shell (30) and the partition cavity (40). When the lithium battery is in a fire environment or is burning itself, the control device controls the connection between the battery inner shell (30) and the partition cavity (40) so that flame retardant material enters the battery inner shell (30) and prevents the battery (31) in the battery inner shell (30) from burning. The first lifting slide plate (43) and the second lifting slide plate (44) are slidably installed on the left and right sides of the partition cavity (40), respectively. The first lifting slide plate (43) and the second lifting slide plate (44) are slidably connected to and tightly fitted to the inner wall of the partition cavity (40). The first lifting slide (43) and the second lifting slide (44) divide the interior of the partition cavity (40) into an upper cavity and a lower cavity. The upper cavity stores flame retardant powder (41), and the lower cavity stores the flame retardant substance, which is a flame retardant gas (42). The battery casing (10) is provided with an air inlet (13), which is connected to the interior of the partition cavity (40) and is used to introduce flame-retardant gas (42) into the interior of the partition cavity (40). Inside the battery inner shell (30), a cutter (50) is slidably mounted above the power cable (33). The cutter (50) is made of iron. A magnet that cooperates with the cutter (50) is fixedly mounted on the second lifting slide plate (44). When the second lifting slide plate (44) is in the initial equilibrium position, the second lifting slide plate (44) drives the cutter (50) to remain stationary above the battery inner shell (30). When a fire occurs, the second lifting slide plate (44) slides down while driving the cutter (50) to slide down, so that the cutter (50) cuts the power cable (33) and blocks the installation channel of the power cable (33), so that a sealed flame-retardant space is formed inside the battery inner shell (30).

2. The lithium battery with a flame-retardant structure according to claim 1, characterized in that, The control device includes a one-way valve (34) installed on the inner shell (30) of the battery, a fire detection sensor and a controller installed on the outer shell (10) of the battery, the fire detection sensor being connected to the controller and the controller being connected to the one-way valve (34).

3. The lithium battery with a flame-retardant structure according to claim 1, characterized in that, The battery casing (10) has an installation cavity (12) inside, and the battery inner shell (30) is fixedly installed inside the installation cavity (12). The partition cavity (40) is formed between the battery inner shell (30) and the battery casing (10).

4. The lithium battery with a flame-retardant structure according to claim 3, characterized in that, The battery inner shell (30) contains at least one battery (31), which is a lithium battery. The battery (31) is mounted in the battery inner shell (30) via a mounting base (32). The mounting base (32) is provided with a power cable (33) for connecting the battery (31), and one end of the power cable (33) is electrically connected to the battery (31).

5. The lithium battery with a flame-retardant structure according to claim 4, characterized in that, A wiring panel (20) is installed on the battery casing (10). The wiring panel (20) has at least one wiring hole (21) and a power switch (22). The wiring hole (21) and the power switch (22) are electrically connected to the power cable (33).

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