Lithium battery spontaneous combustion monitoring system

Abstract

The utility model provides a lithium battery spontaneous combustion monitoring system which comprises a shell, a plurality of battery popping ports are formed in the side wall of the shell, a plurality of battery temporary fixing piles are installed in the shell, and temperature sensing mechanisms and ejection mechanisms are arranged on the battery temporary fixing piles. According to the system, the thermosensitive induction fuse wire is combined with the battery ejection mechanism, so that the battery with sudden temperature rise is separated from the battery pack in time, and the accident of spontaneous combustion of the battery container is effectively prevented and avoided.

Description

Technical Field

[0001] The utility model relates to the field of fire safety, and in particular to a lithium battery spontaneous combustion monitoring system. Background Art

[0002] Vigorously developing large-scale electric energy storage technology is of great significance to the development of smart grids. In addition to effectively solving the time difference contradiction between power generation and power consumption, it can also reduce the impact of intermittent renewable energy such as photovoltaics directly connected to the grid on the power system and improve the quality of electric energy. With the increase in the proportion of renewable energy in the energy structure, energy storage technology will be responsible for ensuring the safe and efficient operation of the power grid in the future, and the potential market is huge. At present, there are many application scenarios for energy storage technology, covering various fields such as new energy power generation, grid side, microgrid, etc., and it is still expanding. The scale of energy storage power stations is constantly increasing under the impetus of market demand, and the highest has increased to hundreds of megawatts. Electrochemical energy storage has a long cycle life and high energy density, so it can well meet the needs of modern energy storage. It occupies a large proportion in energy storage projects, and lithium-ion battery technology has become the mainstream electrochemical energy storage technology due to its advantages in cost and energy density. In order to get rid of dependence on fossil energy and vigorously develop the new energy vehicle industry, the number of electric vehicles has continued to increase, and grid energy storage, substations and communication base station DC power supply systems have become a good place for retired power batteries of electric vehicles. According to statistics, in the next few years, at least 100 megawatt-hours of lithium batteries will be eliminated from electric vehicles every year. The available capacity of these retired power batteries is still relatively high, generally 70-80% of the initial capacity, and can still be used in energy storage facilities such as power grids and communication power supplies to achieve cascade utilization, indirectly reduce the cost of using electric vehicle batteries, and play a positive role in promoting the healthy development of the electric vehicle industry. Lithium battery energy storage systems are usually container-type, consisting of a number of lithium-ion battery clusters and electrical equipment and placed in a confined space. Because the entire system is relatively closed and heat dissipation is not smooth, lithium batteries are prone to heat accumulation during operation, especially under extreme working conditions (overcharging, short circuit, etc.). The large amount of heat accumulated inside the battery will cause the battery to thermally run away, thereby causing fire and explosion accidents.

[0003] Regarding the problem of spontaneous combustion of lithium batteries, the following methods have been proposed in the prior art: ① A method of collecting information such as the temperature, surface pressure, voltage, and discharge rate of the battery body through a battery management system and making a thermal runaway judgment based on this; ② A thermal runaway early warning method of predicting the internal temperature of the battery based on a battery thermal model or the internal chemical impedance of the battery; ③ When a thermal runaway occurs, the battery will generate characteristic gases, and a method of early warning of early thermal runaway based on the monitoring of the corresponding gas components in the battery compartment. However, most of these early warning methods are in the research and exploration stage, and are complex and have relatively harsh conditions when applied. In the field of energy storage system health monitoring technology, the industry currently faces two major technical bottlenecks. One is that in traditional energy storage system technologies, an alarm can only be issued and corresponding measures can only be taken after the battery cell is damaged. The other is that although the industry has achieved monitoring of indicators such as the temperature, voltage, and internal resistance of the battery cell, the monitoring sensitivity is insufficient, and it can only play a role in post-event alarm. How to monitor the health status of the battery cell in a timely, accurate, and comprehensive manner, conduct effective early warning and troubleshooting in advance, and avoid irreparable damage to the energy storage system has become an urgent problem in the industry. Utility Model Content

[0004] In view of the above problems, the present utility model provides a lithium battery spontaneous combustion monitoring system, which combines a heat-sensitive fuse and a battery ejection mechanism, so that the battery with a sudden temperature rise is separated from the battery pack in time, effectively preventing and avoiding the occurrence of accidents of spontaneous combustion of the battery container.

[0005] A lithium battery spontaneous combustion monitoring system includes a housing, and a plurality of battery ejection ports are provided on the side wall of the housing. A plurality of battery temporary fixing posts are installed in the housing, and a temperature sensing mechanism and an ejection mechanism are provided on the battery temporary fixing posts.

[0006] Preferably, a cooling pool is provided outside the housing.

[0007] Preferably, the temperature sensing mechanism is a thermistor wire that melts when heated. One end of the thermistor wire is connected to the battery temporary fixing post, and the other end of the thermistor wire is clamped to a battery positioning plate, and the battery positioning plate is installed between the battery and the battery temporary fixing post.

[0008] Preferably, the ejection mechanism includes a spring. One end of the spring is connected to the battery temporary fixing post, and the other end of the spring abuts against the battery positioning plate.

[0009] Preferably, the battery positioning plate is provided with a through hole, and the thermistor wire penetrates through the through hole from the battery temporary fixing post end and then contacts the battery.

[0010] Preferably, a plurality of guiding channels are provided on the inner side surface of the housing, and the guiding channels communicate with the battery ejection ports.

[0011] Preferably, an enclosing layer is provided outside the housing, and the cooling pool is installed between the housing and the enclosing layer.

[0012] Preferably, at least two springs are configured for each battery, and the thermistor wire is located at the symmetric center point of the two springs.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] In the present utility model, the battery is installed on the battery temporary fixing post inside the housing through the thermistor wire and the spring. When the temperature of the battery rises to the set value, the thermistor wire melts, and under the elastic force of the spring, the heated battery is ejected outside the housing and cooled in the cooling pool. This effectively prevents the self-ignition of the battery from further heating and affecting other batteries, and avoids and eliminates the safety hazards caused by the complete combustion of the entire battery pack. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can be obtained based on these drawings.

[0016] Figure 1 is a three-dimensional view of the overall structure of the present utility model;

[0017] Figure 2 is a top view of the overall structure of the present utility model;

[0018] Figure 3 is a front view of the overall structure of the present utility model;

[0019] Figure 4 is Figure 3 an enlarged view of A in

[0020] Figure 5 is Figure 4 a cross-sectional view taken along B-B in

[0021] Figure 6 is a schematic connection diagram of the battery and the battery temporary fixing post after removing the housing;

[0022] In the figure, 1. enclosing layer, 2. outer shell, 3. battery, 4. battery ejection opening, 5. spring, 6. thermistor wire, 7. battery positioning plate, 8. guiding channel, 9. battery temporary fixing post, 10. guiding channel. Detailed Embodiments

[0023] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0024] As Figures 1-6 shown, the utility model discloses a lithium battery spontaneous combustion monitoring system, which improves the layout of the existing container-type battery. A plurality of battery ejection ports 4 are installed on the side wall of the housing 2 of the existing container battery. Guide channels 8 are installed on the inner side surface of the housing 2 at the position of each battery ejection port, and the batteries are placed in the guide channels. A plurality of battery temporary fixing piles 9 are arranged inside the housing. Temperature sensing mechanisms and ejection mechanisms are arranged on the outer side surface of each battery temporary fixing pile at positions opposite to the battery ejection ports. The ejection mechanism symmetrically installs two springs 5, and the springs are cylindrical spiral compression springs. The other ends of the springs are commonly connected to a battery positioning plate 7, and the battery 3 is installed on the side of the battery positioning plate 7 away from the spring 5. The temperature sensing mechanism includes a thermistor wire 6 installed at the symmetric center between the two springs, and the thermistor wire is melted when heated. Specifically: the battery positioning plate 7 is provided with a through hole, and a groove is processed at the end of the through hole, close to the battery. The rear end of the thermistor wire is connected to the battery temporary fixing pile 9, and the front end of the thermistor wire penetrates forward through the through hole from the end of the battery temporary fixing pile and the end is enlarged, and is matched with the groove on the positioning plate and clamped at the front end of the battery positioning plate 7.

[0025] A surrounding layer 1 is arranged outside the housing 2, and a cooling pool structure is formed between the housing 2 and the surrounding layer 1. The pool is filled with a coolant, and the liquid level of the coolant is lower than the bottom of the lowermost battery. Under normal conditions, the hot melt resistance wire pulls the battery positioning plate, compresses and deforms the spring to store energy, and the battery is installed in the guide channel. The battery ejection port also functions as a heat dissipation port. When the temperature of a certain battery rises abnormally, the enlarged part of the hot melt resistance wire is melted by heat, and under the action of the restoring force of the spring, the battery is pushed out of the housing, and the battery falls into the cooling pool and is quickly cooled.

[0026] The battery temporary fixing piles are arranged in a rectangular shape inside the housing, and a plurality of ejection ports are processed on the four side surfaces of the housing. The batteries are respectively installed on the side surfaces of the battery temporary fixing piles at positions corresponding to the battery ejection ports.

[0027] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A lithium battery spontaneous combustion monitoring system, characterized in that: It comprises a shell (2), the side wall of which is provided with a plurality of battery ejection openings (4), a plurality of battery temporary fixing piles (9) are installed in the shell, and a temperature sensing mechanism and an ejection mechanism are provided on the battery temporary fixing piles.

2. A lithium battery spontaneous combustion monitoring system according to claim 1, characterized in that: The temperature sensing mechanism is a thermistor wire (6) that melts when heated, one end of the thermistor wire being connected to a temporary battery fixing pile (9), the other end of the thermistor wire being clamped to a battery positioning plate (7), and the battery positioning plate being installed between the battery and the temporary battery fixing pile.

3. A lithium battery spontaneous combustion monitoring system according to claim 2, characterized in that: The ejection mechanism comprises a spring (5), one end of which is connected to a temporary battery fixing pile (9), and the other end of which is in contact with a battery positioning plate (7).

4. A lithium battery spontaneous combustion monitoring system according to claim 3, characterized in that: The battery positioning plate (7) is provided with a through hole, and the thermistor wire (6) passes through the through hole forward from the temporary fixing pile end of the battery and then contacts the battery.

5. A lithium battery spontaneous combustion monitoring system according to claim 3, characterized in that: Each battery is configured with at least two springs (5), and the thermistor wire (6) is located at the symmetrical center points of the two springs.

6. A lithium battery spontaneous combustion monitoring system according to claim 1, characterized in that: The inner side surface of the housing (2) is provided with a plurality of guide channels (10), and the guide channels are in communication with the battery ejection outlet.

7. A lithium battery spontaneous combustion monitoring system according to claim 1, characterized in that: A cooling pool is arranged outside the shell.

8. A lithium battery spontaneous combustion monitoring system according to claim 7, characterized in that: An enclosure layer (1) is arranged outside the shell, and the cooling pool is installed between the shell and the enclosure layer.

Images