CN-116344910-B - Lithium battery with flame-retardant structure

Abstract

The invention relates to the technical field of lithium batteries, in particular to a lithium battery with a flame-retardant structure, which comprises a battery outer shell and a battery inner shell arranged in the battery outer shell, wherein a separation cavity is formed between the battery outer shell and the battery inner shell, flame-retardant substances for preventing combustion are stored in the separation cavity, and a control device for controlling the conduction of the battery inner shell and the separation cavity is further included. According to the invention, the battery outer shell and the battery inner shell for storing the battery are arranged, the separation cavity is formed between the battery outer shell and the battery inner shell, flame-retardant substances for preventing combustion are stored in the separation cavity, and the control device for controlling the conduction of the battery inner shell and the separation cavity is also arranged.

Inventors

• Ye Jiechao

Assignees

• 龙海协能新能源科技有限公司

Dates

Publication Date

20260505

Application Date

20230118

Claims (5)

1. 1. The lithium battery with the flame-retardant structure is characterized by comprising a battery outer shell (10) and a battery inner shell (30) arranged inside the battery outer shell (10), wherein the battery inner shell (30) is used for storing a battery (31), a separation cavity (40) is formed between the battery outer shell (10) and the battery inner shell (30), and flame-retardant substances for preventing combustion are stored in the separation cavity (40); the lithium battery also comprises a control device for controlling the conduction of the battery inner shell (30) and the separation cavity (40), when the lithium battery is in a fire environment or burns by itself, the control device controls the conduction of the battery inner shell (30) and the separation cavity (40) so as to enable flame-retardant substances to enter the battery inner shell (30) and prevent the battery (31) in the battery inner shell (30) from burning; A first lifting slide plate (43) and a second lifting slide plate (44) are respectively and slidably arranged on the left side and the right side of the separation cavity (40), and the first lifting slide plate (43) and the second lifting slide plate (44) are both in sliding connection with the inner wall of the separation cavity (40) and are tightly attached to each other; the first lifting slide plate (43) and the second lifting slide plate (44) divide the interior of the separation chamber (40) into an upper cavity and a lower cavity, flame retardant powder (41) is stored in the interior of the upper cavity, the flame retardant substance is stored in the interior of the lower cavity, and the flame retardant substance is flame retardant gas (42); An air inlet (13) is formed in the battery shell (10), and the air inlet (13) is communicated with the inside of the separation cavity (40) and is used for introducing flame-retardant gas (42) into the inside of the separation cavity (40); The battery inner shell (30) is internally provided with a cutter (50) which is arranged above the energizing cable (33) in a sliding manner, the cutter (50) is made of iron materials, a magnet which is matched with the cutter (50) is fixedly arranged on the second lifting slide plate (44), when the second lifting slide plate (44) is positioned at an initial balance position, the second lifting slide plate (44) drives the cutter (50) to be static above the battery inner shell (30), when a fire occurs, the second lifting slide plate (44) slides downwards and simultaneously drives the cutter (50) to slide downwards, so that the cutter (50) cuts off the energizing cable (33) and blocks an installation channel of the energizing cable (33), and a closed flame-retardant space is formed inside the battery inner shell (30).
2. 2. The lithium battery with a flame retardant structure according to claim 1, wherein the control device comprises a check valve (34) mounted on the battery inner case (30), a fire detection sensor mounted on the battery outer case (10), and a controller, the fire detection sensor being connected to the controller, the controller being connected to the check valve (34).
3. 3. The lithium battery with the flame-retardant structure according to claim 1, wherein the battery outer shell (10) is internally provided with a mounting cavity (12), the battery inner shell (30) is fixedly mounted in the mounting cavity (12), and the separation cavity (40) is formed between the battery inner shell (30) and the battery outer shell (10).
4. 4. A lithium battery with a flame-retardant structure according to claim 3, characterized in that at least one battery (31) is stored in the battery inner shell (30), the battery (31) is a lithium battery, the battery (31) is arranged in the battery inner shell (30) through a mounting seat (32), an energizing cable (33) connected with the battery (31) is arranged on the mounting seat (32), and one end of the energizing cable (33) is electrically connected with the battery (31).
5. 5. The lithium battery with a flame-retardant structure according to claim 4, characterized in that a wiring panel (20) is mounted on the battery case (10), at least one wiring hole (21) and a power switch (22) are provided on the wiring panel (20), and the wiring hole (21) and the power switch (22) are electrically connected with the energizing cable (33).

Description

Lithium battery with flame-retardant structure Technical Field The invention particularly relates to the technical field of lithium batteries, in particular to a lithium battery with a flame-retardant structure. Background Along with the acceleration of economic development and industrialization process in China, a series of environmental problems emerge from the water surface, and energy crisis and environmental pollution become important contradictions restricting the development in China, so that the adjustment of energy structure promotes the innovation of energy storage technology and becomes a national key development strategy. Lithium ion batteries are one of the most important technologies in the energy storage field, and are widely applied to the fields of photovoltaic power generation and electric automobiles. Lithium batteries refer to batteries that contain lithium (including metallic lithium, lithium alloys, and lithium ions, lithium polymers) in an electrochemical system. Lithium batteries can be broadly divided into two categories, lithium metal batteries and lithium ion batteries. Lithium ion batteries do not contain lithium in the metallic state and are rechargeable. The lithium metal battery of the fifth generation product of the rechargeable battery is born in 1996, and the safety, the specific capacity, the self-discharge rate and the cost performance ratio of the lithium metal battery are all superior to those of the lithium ion battery. Due to its own high technical requirements, only a few countries' companies are now producing such lithium metal batteries. Since the appearance of smart phones in 2007 and the subsequent introduction of tablet computers, the world has entered the intellectualization era, and the strong demand for smart phones and tablet computers has rapidly driven the sales of digital lithium batteries, wherein the sales of lithium batteries of mobile phones is the greatest. According to data statistics, the market scale of the finished lithium battery pack in the fields of new energy automobiles, power grid energy storage, special vehicles, communication base stations and the like in 2012 is 35 hundred million yuan, and the market scale is increased by 34.6 percent compared with 26 hundred million yuan in 2011. Wherein the application ratio of the new energy automobile is 57 percent. The product structure of the digital lithium battery industry in 2012 is quickly adjusted, so that the sales of soft package lithium batteries and cylindrical lithium batteries are quickly increased, the speed is increased by more than 30%, and the market scale of the square lithium batteries with aluminum shells is quickly contracted. The lithium battery has certain requirements on temperature when in use, and if the lithium battery burns or explodes due to the overhigh temperature when the external fire occurs, the lithium battery has certain potential safety hazard. Disclosure of Invention The invention aims to provide a lithium battery with a flame-retardant structure, which solves the problems that the lithium battery has certain requirements on temperature when in use and has certain potential safety hazard due to combustion or explosion caused by overhigh temperature when an external fire occurs. In order to achieve the above purpose, the present invention provides the following technical solutions: The lithium battery with the flame-retardant structure comprises a battery outer shell and a battery inner shell arranged in the battery outer shell, wherein the battery inner shell is used for storing a battery, a separation cavity is formed between the battery outer shell and the battery inner shell, and flame-retardant substances for preventing combustion are stored in the separation cavity; The lithium battery is characterized by further comprising a control device for controlling the conduction of the battery inner shell and the separation cavity, when the lithium battery is in a fire environment or burns by itself, the control device controls the conduction of the battery inner shell and the separation cavity so that flame-retardant substances enter the battery inner shell and the combustion of the battery in the battery inner shell is prevented. The fire-resistant powder control device comprises a control device, a fire-resistant sensor and a controller, wherein the fire-resistant valve is arranged on an inner shell of a battery, the fire-resistant sensor is arranged on an outer shell of the battery, the fire-resistant sensor is connected with the controller, the controller is connected with the one-way valve, in an initial state, the air pressure of flame-resistant gas in a lower cavity is balanced with the gravity of flame-resistant powder in an upper cavity, a first lifting slide plate and a second lifting slide plate are positioned on the upper side of a separation cavity, the volume of the lower cavity is larger than that of the upper cavity, when a fire condition occurs, t