Rapid cooling system for marine battery pack

Abstract

The utility model discloses a marine battery pack rapid cooling system which is provided with a cavity for storing batteries, fire fighting pipelines are fixed on the top and the side face of the inner wall of the cavity, water outlets are evenly distributed in the sides, facing the batteries, of the fire fighting pipelines, and the fire fighting pipelines are all connected to a fire fighting main pipe. The fire-fighting main pipe is connected with the cooling liquid tank through a high-pressure water pump, a liquid outlet is formed in the bottom of the cavity and connected to the cooling liquid tank through a pipeline, and the fixing position of the cooling liquid tank is lower than that of the cavity. The battery cooling system is arranged by utilizing the fire-fighting pipeline on the ship, so that the setting cost can be reduced, the battery cooling effect can be greatly improved, the safety performance of the battery pack is improved, and the accident handling time window is increased.

Description

Technical Field

[0001] The utility model relates to the field of battery safety. Background Art

[0002] With the advancement of electrification in the marine industry, lithium batteries are increasingly being used in the marine sector. Compared to energy storage and automotive battery packs, ships have higher safety requirements when operating on the water. Generally speaking, a lithium battery accident begins with the loss of control of a single cell, which gradually spreads to the entire battery pack. The duration of this process is determined by the battery system structure and the actual layout of safety measures.

[0003] Currently, most battery cooling systems are used in automobiles. For example, the patent application CN208570855U, published on March 1, 2019, and titled "Battery Cooling Assembly and Electric Vehicle Cooling System Including Such a Battery Cooling Assembly," discloses a battery cooling assembly comprising: a temperature evaporating plate filled with a phase-change fluid, the upper surface of which is provided with at least one set of battery frames for inserting battery cells at intervals; and a cooling plate disposed on the side of and connected to the temperature evaporating plate, the cooling plate having a coolant inlet and a coolant outlet, and a cooling channel formed within the cooling plate for connecting the coolant inlet and the coolant outlet. Due to the compact structure of automobiles, similar cooling systems have limited effectiveness. For the larger lithium battery power units used in ships, not only is the installation and equipment cost extremely high, but the cooling effect is also limited due to the increased size of the lithium battery.

[0004] On ships, aerosol injection is also used to submerge battery cells to slow the spread of thermal runaway. However, this method inherently fails to remove heat immediately and is ineffective at dispersing the heat. Furthermore, due to the limited space within the battery pack, it's difficult to cover every cell. If a thermal runaway cell happens to be in a blind spot, the delay won't be effective.

[0005] Therefore, there is a need for a cooling system suitable for use on ships. When a safety accident of a lithium battery on a ship occurs, in order to give the crew more time to handle the accident and carry out damage control, a cooling system is needed that can prolong the process time as much as possible. Summary of the Invention

[0006] The technical problem to be solved by the utility model is to realize a lithium battery cooling system suitable for ships.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a rapid cooling system for a marine battery pack, the system is provided with a cavity for storing batteries, fire-fighting pipes are fixed on the top and side of the inner wall of the cavity, and water outlets are evenly distributed on the side of the fire-fighting pipes facing the batteries. The fire-fighting pipes are all connected to the fire main, and the fire main is connected to the cooling liquid tank through a high-pressure water pump. A liquid outlet is provided at the bottom of the cavity, and the liquid outlet is connected to the cooling liquid tank through a pipe. The fixed position of the cooling liquid tank is lower than the cavity.

[0008] Each water outlet of the fire-fighting pipe is provided with an electric valve, and the battery is provided with a plurality of temperature sensors for collecting heat of battery cells at different positions. Each temperature sensor is connected to and outputs a temperature signal to a controller, and the controller is connected to and outputs a control signal to each electric valve.

[0009] The controller is connected to an interactive device in the ship's cockpit via a data line, and the interactive device includes a display, an input interface, and an alarm.

[0010] The liquid outlet is provided with an opening valve capable of controlling the opening, and the controller is connected to and outputs a control signal to the opening valve.

[0011] Each cell of the battery is wrapped with an insulating film, and gaps are provided between the cells for cooling liquid to pass through.

[0012] A bracket is provided at the bottom of the cavity, and the battery is fixed on the bracket with a gap between the bracket and the bottom of the cavity.

[0013] The coolant is a liquid with high specific heat and low electrical conductivity.

[0014] The utility model utilizes the fire protection pipeline on the ship to set up a battery cooling system, which can not only reduce the installation cost, but also greatly improve the battery cooling effect, improve the safety performance of the battery pack, and increase the accident handling time window. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following is a brief description of the contents and marks in each figure in the utility model specification:

[0016] Figure 1 This is the functional block diagram of the rapid cooling system for marine battery packs;

[0017] The markings in the above figures are: 1. Cavity; 2. Fire-fighting pipeline; 3. Fire-fighting main; 4. High-pressure water pump; 5. Coolant tank. DETAILED DESCRIPTION

[0018] Below, with reference to the accompanying drawings, through the description of the embodiments, the specific implementation methods of the present invention, such as the shape, structure, relative positions and connection relationships of the various components involved, the functions and working principles of the various parts, the manufacturing process and operating methods, etc., are further explained in detail to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0019] The rapid cooling system of the marine battery pack can be modified using a fire protection system. Therefore, the volume space on the ship is larger, so there can be sufficient battery storage space and coolant storage space. The battery cavity 1 is a sealed structure, and fire protection pipes are fixed on the top and sides of the inner wall of the body. The layout structure of the pipes can be designed as needed. The fire protection pipe has water outlets evenly distributed on the side facing the battery. In order to carry out targeted cooling, each water outlet is provided with an independent electromagnetic valve. Each electromagnetic valve can be connected through a controller to control some or all of the water outlets to work. There are multiple temperature sensors in the battery that collect heat from battery cells at different positions. These temperature sensors can use the temperature collection equipment of the existing battery management system to obtain the battery temperature at different positions. Each temperature sensor is connected and outputs a temperature signal to the controller, so that the controller can open the electromagnetic valve only for the temperature-rising area according to the temperature changes in different areas, allowing the coolant to impact the position that needs cooling.

[0020] In order to avoid battery damage, each battery cell is wrapped with an insulating film and a plastic film. At the same time, there are gaps between the battery cells for the coolant to pass through. This allows the coolant to flow inside the battery and improve the cooling effect. The coolant used should preferably have high specific heat and low conductivity.

[0021] The fire-fighting pipes are all connected to the fire-fighting main 3, and the fire-fighting main 3 is connected to the cooling liquid tank 5 through the high-pressure water pump 4. A liquid outlet is provided at the bottom of the cavity 1, which can automatically discharge the accumulated coolant. In order to accurately control it, an opening valve that can control the opening can be provided at the liquid outlet. The controller is connected and outputs a control signal to the opening valve, so that the high-pressure water pump 4 can be cooperated with as needed to accumulate coolant, so that the entire cavity 1 is filled with coolant, and a small amount is discharged to realize coolant circulation. The liquid outlet is connected to the cooling liquid tank 5 through a pipe. The fixed position of the cooling liquid tank 5 is lower than the cavity 1, so that the refluxed coolant can automatically flow back by gravity without the need to install an additional water pump. In order to accurately control the coolant, water level sensors can be set in the cavity 1 and the cooling liquid tank 5. Both water level sensors output water level signals to the controller, which allows the controller to control to avoid lack of coolant and remind the staff to add it when it is lacking, and also to prevent the coolant from overflowing from the cavity 1.

[0022] During battery installation, a bracket is installed at the bottom of cavity 1. The battery is fixed to the bracket with a gap between the bracket and the bottom of cavity 1. This allows the battery to be suspended in cavity 1. This prevents the bottom battery from being immersed in the coolant for a long time when the coolant needs to be completely drained. The controller of the entire system is the control core. The controller is connected to the interactive equipment in the ship's cockpit via a data cable. The interactive equipment includes a display, input interface, and alarm, facilitating manual control and supervision by staff in the cockpit.

[0023] This system can spray coolant through the fire pipe to the vicinity of each battery cell. When a battery cell experiences thermal runaway, the corresponding temperature sensor will send data to the battery management system. When the battery management system recognizes the over-temperature signal, it will start the high-pressure water pump 4 to spray the coolant through the fire pipe to each battery cell. At the same time, the liquid outlet will be opened, and the high-temperature liquid will flow out from the outlet to take the heat out of the battery.

[0024] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A marine battery pack rapid cooling system, characterized by: The system is equipped with a cavity for storing batteries. Firefighting pipes are fixed to the top and sides of the inner wall of the cavity. Water outlets are evenly distributed on the side of the firefighting pipes facing the batteries. The firefighting pipes are connected to the fire main, which is connected to the coolant tank via a high-pressure water pump. A liquid outlet is provided at the bottom of the cavity, which is connected to the coolant tank via a pipe. The coolant tank is fixed below the cavity. Each cell of the battery is wrapped with an insulating film, and gaps are provided between the cells for cooling liquid to pass through.

2. The marine battery pack rapid cooling system according to claim 1, characterized in that: Each water outlet of the fire-fighting pipe is provided with an electric valve, and the battery is provided with a plurality of temperature sensors for collecting heat of battery cells at different positions. Each temperature sensor is connected to and outputs a temperature signal to a controller, and the controller is connected to and outputs a control signal to each electric valve.

3. The marine battery pack rapid cooling system according to claim 2, characterized in that: The controller is connected to an interactive device in the ship's cockpit via a data line, and the interactive device includes a display, an input interface, and an alarm.

4. The marine battery pack rapid cooling system according to claim 3, characterized in that: The liquid outlet is provided with an opening valve capable of controlling the opening, and the controller is connected to and outputs a control signal to the opening valve.

5. The marine battery pack rapid cooling system according to claim 4, characterized in that: A bracket is provided at the bottom of the cavity, and the battery is fixed on the bracket with a gap between the bracket and the bottom of the cavity.

6. The marine battery pack rapid cooling system according to claim 5, characterized in that: The coolant is a liquid with high specific heat and low electrical conductivity.

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