Liquid cooling plate and battery pack

Abstract

The utility model provides a liquid cooling plate which comprises a plate body with a flow channel, and a liquid guide pipe communicated with the flow channel and a storage container containing medicaments are arranged on the plate body. The storage container is communicated with the liquid guide pipe and provided with a discharge port; a valve is arranged on the liquid guide pipe; after entering the storage container through the liquid guide pipe, the cooling liquid in the flow channel can carry the medicament to be discharged through the discharge port, and the medicament is heated and decomposed to generate gas for inhibiting combustion. According to the liquid cooling plate disclosed by the utility model, when thermal runaway occurs in the battery pack, the temperature in the battery pack can be reduced, and an environment with relatively low oxygen content is formed to reduce the thermal runaway reaction rate; and meanwhile, a fire-fighting structure in the battery pack is also simplified, cooling liquid in the flow channel can be directly introduced as power liquid, and the medicament is sprayed into the battery pack.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially relate to a liquid cooling plate. BACKGROUND

[0002] When the battery pack is in use, it may occur heat runaway due to internal and external reasons, heat runaway refers to the battery in constant voltage charging current and battery temperature occurs an accumulative enhancement effect and gradually damage. Battery pack heat runaway can trigger violent chemical reaction, produce a large amount of heat and gas. These gases accumulate in the battery, resulting in increasing pressure, when the pressure exceeds the bearing limit of the battery shell, explosion may occur. The fragments and shock wave produced by explosion can cause serious injury to the surrounding personnel and objects. At the same time, the high temperature generated by heat runaway may also ignite the surrounding combustible material, thereby causing a fire.

[0003] At present, the heat management of energy storage battery system mostly adopts the way of liquid cooling plate to cool the battery. When heat runaway occurs in the battery pack, it is necessary to extinguish the fire and cool the battery pack in time to control the heat diffusion of the battery. In order to extinguish the fire and cool the battery pack in time, the fire-fighting structure provided on the battery pack is to set up fire-fighting pipeline, and the fire extinguishing agent is delivered into the battery pack through the fire-fighting pipeline by pump. However, this fire-fighting structure scheme is complex in technology and complicated in structure. SUMMARY

[0004] Therefore, the utility model aims at providing a liquid cooling plate to simplify the fire-fighting structure in the battery pack.

[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] A liquid cooling plate, comprising a plate body with a flow channel, a liquid guide pipe communicating with the flow channel is arranged on the plate body, and a storage container containing a medicament is arranged on the plate body.

[0007] The storage container is communicated with the liquid guide pipe and has a discharge port. A valve is arranged on the liquid guide pipe. After the cooling liquid in the flow channel enters the storage container through the liquid guide pipe, the medicament can be carried out of the discharge port, and the medicament can be decomposed by heat to generate gas to inhibit combustion.

[0008] Further, one end of the liquid guide pipe connected with the storage container has a universal pipe to adjust the direction of the discharge port.

[0009] Further, the medicament is sodium bicarbonate particles or lithium bicarbonate particles.

[0010] Further, the storage container is made of plastic material.

[0011] Further, the storage container is a columnar shape, and one end of the storage container is connected to the liquid guide pipe, and the other end of the storage container is gradually reduced in diameter in a direction towards the discharge port.

[0012] Further, the connection part of the storage container and the liquid guide pipe is located above the central axis of the storage container.

[0013] Further, the liquid guide pipe is connected to the storage container along a tangent direction of the storage container.

[0014] Further, one end of the liquid guide pipe provided on the plate body is provided with an inlet pipe and an outlet pipe, and the flow channel is communicated between the inlet pipe and the outlet pipe.

[0015] Compared with the prior art, the liquid cooling plate has the following advantages:

[0016] The liquid cooling plate can guide the cooling liquid in the flow channel of the plate body into the storage container when thermal runaway occurs in the battery pack, the cooling liquid can carry the medicament to flow to the discharge port due to liquid pressure, and finally spray into the battery pack, the medicament is quickly heated and decomposed due to high temperature in the battery pack, combustion inhibition gas is generated, finally, water vapor and combustion inhibition gas generated by decomposition of the medicament can carry the heat in the battery pack and be discharged from the battery pack, thereby reducing the temperature in the battery pack and forming an environment with low oxygen content to reduce the thermal runaway reaction rate; meanwhile, the fire-fighting structure in the battery pack is simplified, and the cooling liquid in the flow channel can be directly used as a power liquid to spray the medicament into the battery pack.

[0017] Secondly, the universal pipe is connected to the storage container, the position of the storage container and the angle of the discharge port can be adjusted as required, so that the cooling liquid can carry the medicament to be sprayed in the specified area. Sodium bicarbonate and lithium bicarbonate can be decomposed to produce carbon dioxide gas when heated to a certain temperature, the carbon dioxide gas can not only be discharged to carry away heat, but also can dilute oxygen to inhibit combustion.

[0018] In addition, the storage container is made of plastic material, which is chemically stable and has low manufacturing cost and light weight, which is beneficial to the lightweight of the liquid cooling plate. The storage container is provided as a columnar shape with a gradually reduced diameter at one end, so that the cooling liquid can produce a Venturi effect when sprayed out of the storage container, thereby improving the initial spraying speed. The connection part of the storage container and the liquid guide pipe is arranged at an upper position of the storage container, so that the cooling liquid can be more fully contacted with the medicament, and the medicament can be more easily carried out of the storage container by the cooling liquid.

[0019] Furthermore, connecting the liquid guide pipe to the storage container along the tangential direction of the storage container can make the cooling liquid flow along the arc-shaped inner wall after entering the storage container, and the mixing of the cooling liquid and the medicament is more sufficient. The liquid guide pipe, the liquid inlet pipe and the liquid outlet pipe are arranged at the same end of the plate body, so that the concentrated assembly operation of the liquid cooling plate can be facilitated, and the utilization of the space in the battery pack can be more sufficient.

[0020] Another purpose of the utility model lies in providing a battery pack which is equipped with the liquid cooling plate as described above.

[0021] The battery pack has the same beneficial effects as the liquid cooling plate relative to the prior art, and thus will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings constituting a part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model and do not constitute undue limitation on the utility model. In the drawings:

[0023] Figure 1 The drawing is a structural schematic view of the liquid cooling plate according to the utility model embodiment one;

[0024] Figure 2 The drawing is a structural schematic view of another implementation form of the liquid cooling plate according to the utility model embodiment one.

[0025] Explanation of reference signs:

[0026] 1, plate body;

[0027] 2, liquid guide pipe;

[0028] 201, universal pipe; 202, valve;

[0029] 3, storage container;

[0030] 301, discharge port;

[0031] 4, liquid inlet pipe;

[0032] 5, liquid outlet pipe. DETAILED DESCRIPTION

[0033] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0034] In the description of the utility model, it needs to explain, if appear "upper", "lower", "inner", "outer" and so on indicate the orientation or positional relation term, it is based on the orientation or positional relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and is not indicate or imply that the device or element indicated must have a specific orientation, a specific orientation structure and operation, therefore cannot be understood as the limitation to the utility model. In addition, if the terms "first", "second" and the like appear, they are also used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In addition, in the description of the utility model, unless otherwise expressly limited, the terms "mounting", "connection", "connection" and "connector" should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with the specific situation.

[0036] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0037] Embodiment one

[0038] This embodiment relates to a liquid cooling plate to integrate fire-fighting function to simplify the fire-fighting structure in the battery pack.

[0039] In the overall structure, the liquid cooling plate in this embodiment includes a plate body with a flow channel, a liquid guide pipe communicating with the flow channel on the plate body, and a storage container containing a medicament.

[0040] The storage container is communicated with the liquid guide pipe and has a discharge port. The valve is arranged on the liquid guide pipe. The coolant in the flow channel can carry the medicament out of the discharge port after entering the storage container through the liquid guide pipe, and the medicament can be rapidly decomposed by heat to generate combustion-inhibiting gas.

[0041] As arranged above, the liquid cooling plate of this embodiment can guide the coolant in the flow channel of the plate body into the storage container when thermal runaway occurs in the battery pack. The coolant will carry the medicament to flow to the discharge port due to hydraulic pressure, and finally spray into the battery pack. The medicament is rapidly decomposed by heat in the battery pack to generate combustion-inhibiting gas. Finally, the water vapor and the combustion-inhibiting gas generated by the decomposition of the medicament can carry the heat in the battery pack out of the battery pack, reduce the temperature in the battery pack, and form an environment with low oxygen content to reduce the reaction rate of thermal runaway. At the same time, the fire-fighting function is integrated on the liquid cooling plate, which simplifies the fire-fighting structure in the battery pack, and the coolant in the flow channel can be directly used as the power liquid to spray the medicament into the battery pack.

[0042] Based on the above overall introduction, referring to Figure 1 Specifically, the liquid cooling plate of the present embodiment is connected to the cooling liquid circulation line in the battery pack. When thermal runaway occurs in the battery pack, the cooling liquid in the cooling liquid circulation line has a certain pressure, and can enter the storage container 3 through the liquid guide pipe 2. The combustion-inhibiting gas is not flammable and does not support combustion in the battery pack, and can reduce the oxygen content in the battery pack to create a non-flammable environment.

[0043] The liquid guide pipe 201 can guide the cooling liquid in the flow channel out, and the valve 202 can control the opening and closing of the liquid path in the liquid guide pipe 201. In the present embodiment, the liquid guide pipe 201 is connected to the plate body 1 through a quick connector, which has stable sealing effect and is easy to assemble. Of course, the liquid guide pipe 201 can also be connected to the plate body 1 through screwing, as long as the sealing can be guaranteed. The valve 202 is an electrically controlled valve 202, which is electrically connected to the BMS (Battery Management System) of the battery pack. When the BMS detects thermal runaway, it can control the valve 202 to open, and the cooling liquid in the flow channel continuously enters the liquid guide pipe 201 due to the liquid pressure, and is finally sent to the storage container 3 by the liquid guide pipe 201, and then the cooling liquid carrying the medicament is sprayed out of the storage container 3.

[0044] Further, in order to enable the discharge port 301 to be aligned with the predetermined position, the end of the liquid guide pipe 201 connected to the storage container 3 is provided with a universal pipe 201, so as to constitute an adjustable direction of the discharge port 301. By providing the universal pipe 201 connected to the storage container 3, the position of the storage container 3 and the angle of the discharge port 301 can be adjusted as needed, so that the cooling liquid carrying the medicament can be sprayed in the specified area. The discharge port 301 of the present embodiment is directed upward of the battery module, and the cooling liquid and the medicament are sprayed upward of the battery module to extinguish the fire and cool down.

[0045] Specifically, the medicament is sodium bicarbonate particles or lithium bicarbonate particles. Sodium bicarbonate decomposes into sodium carbonate, water and carbon dioxide when heated, and lithium bicarbonate produces lithium carbonate, water and carbon dioxide when heated. Both of them can absorb heat to decompose carbon dioxide gas, which can not only exhaust heat, but also dilute the oxygen in the environment of the battery module, thereby inhibiting combustion. Common extinguishing agents in battery packs use heptafluoropropane and perfluorohexanone, which are expensive. In the present embodiment, the medicament is sodium bicarbonate particles, which have low material cost and are easy to store. Of course, the medicament can also be made of other materials, as long as it can be carried out of the storage container 3 by the cooling liquid and can be heated to decompose into combustion-inhibiting gas.

[0046] Secondly, to optimize the performance of storage container 3, it is made of plastic. Plastic has relatively stable chemical properties, and using plastic to make the storage container results in lower manufacturing costs and lighter weight, which is beneficial for the weight reduction of the liquid cooling plate. Specifically, the plastic material can be polyetherketone, polyimide, or other materials with good high-temperature resistance, which helps to enhance the storage container 3's resistance to thermal deformation.

[0047] Furthermore, the storage container 3 is cylindrical, with one axial end connected to the liquid guide pipe 2, and the other end gradually decreasing in diameter towards the outlet 301. Designing the storage container 3 as a cylindrical shape with a gradually decreasing diameter at one end allows the coolant to generate a Venturi effect when sprayed from the storage container 3, increasing the initial spray velocity and improving the fire extinguishing and cooling speed. Of course, the storage container 3 can also be of other shapes, as long as it forms a converging nozzle shape at the outlet 301.

[0048] Regarding the connection point between the liquid guide tube 2 and the storage container 3, in this embodiment, the connection point between the storage container 3 and the liquid guide tube 2 is located above the central axis of the storage container 3. Setting the connection point between the storage container 3 and the liquid guide tube 2 at the upper part of the storage container 3 allows the coolant to come into more complete contact with the agent, making it easier for the agent to be carried out of the storage container 3 by the coolant.

[0049] Furthermore, as an optimization of the liquid cooling plate structure, one end of the plate body 1 with the liquid guide pipe 2 is equipped with an inlet pipe 4 and an outlet pipe 5, with a flow channel connecting the inlet pipe 4 and the outlet pipe 5. Placing the liquid guide pipe 2, the inlet pipe 4, and the outlet pipe 5 at the same end of the plate body 1 facilitates centralized assembly of the liquid cooling plate and makes fuller use of the space within the battery pack. In this embodiment, both the inlet pipe 4 and the outlet pipe 5 are connected to the plate body 1 via quick connectors. Similarly, the inlet pipe 4 and the outlet pipe 5 can also be screwed onto the plate body 1, as long as a seal is ensured.

[0050] As another possible implementation of this embodiment, see below. Figure 2 As shown, the liquid guide pipe 2 is connected to the storage container 3 along the tangential direction. This arrangement allows the coolant to flow along the arc-shaped inner wall after entering the storage container 3, impacting and dissolving the agent before being sprayed out from the outlet 301. This ensures more thorough mixing of the coolant and the agent, facilitating the rapid discharge of the agent.

[0051] The liquid cooling plate of the embodiment can guide the cooling liquid in the flow channel of the plate body 1 into the storage container 3 when thermal runaway occurs in the battery pack, the cooling liquid carrying the medicament is sprayed into the battery pack from the discharge port 301, the medicament is quickly decomposed by heat in the battery pack, carbon dioxide gas is generated, finally, the water vapor and the carbon dioxide gas can carry the heat in the battery pack and are discharged from the battery pack, the temperature in the battery pack is reduced, and an environment with low oxygen content is formed to reduce the reaction rate of thermal runaway.

[0052] Embodiment two

[0053] The embodiment relates to a battery pack provided with the liquid cooling plate in embodiment one.

[0054] By arranging the liquid cooling plate in embodiment one, the battery pack can guide the cooling liquid in the flow channel of the plate body into the storage container when thermal runaway occurs in the battery pack, the cooling liquid carrying the medicament is sprayed into the battery pack from the discharge port, the medicament is quickly decomposed by heat in the battery pack, carbon dioxide gas is generated, finally, the water vapor and the carbon dioxide gas can carry the heat in the battery pack and are discharged from the battery pack, the temperature in the battery pack is reduced, and an environment with low oxygen content is formed to reduce the reaction rate of thermal runaway.

[0055] Secondly, the liquid cooling plate is integrated with the fire-fighting function, a special fire-fighting pump is not needed, the fire-fighting structure in the battery pack is simplified, the space utilization rate in the battery system is improved, and the production and assembly costs of the battery pack are reduced.

[0056] In specific implementation, for example, the battery pack of the embodiment is used on a vehicle, the liquid cooling plate is connected to a water cooling machine circulation line of the vehicle, after thermal runaway occurs in the battery pack, the BMS sends a thermal runaway alarm signal, the vehicle-mounted water cooling machine starts to work, meanwhile, the BMS controls the valve to be opened and in an always-on state, the cooling liquid flows into the storage container through the liquid guide pipe, is mixed with sodium bicarbonate particles to form a mixed solution, and the mixed solution is sprayed on the battery module through the discharge port.

[0057] The above merely describes the preferred embodiments of the utility model and is not intended to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A liquid cooling plate comprising a plate body having a flow channel, characterized in that: a liquid guide pipe is arranged on the plate body and communicates with the flow channel; and a storage container containing a medicament is arranged on the plate body; the storage container communicates with the liquid guide pipe and has a discharge port; a valve is arranged on the liquid guide pipe; and the cooling liquid in the flow channel can carry the medicament out of the discharge port after entering the storage container through the liquid guide pipe, and the medicament can generate a combustion-inhibiting gas by thermal decomposition.

2. The liquid cooling plate according to claim 1, characterized in that: the end of the liquid guide pipe connected to the storage container has a universal pipe to adjust the direction of the discharge port.

3. The liquid cooling plate according to claim 1, characterized in that: the medicament is sodium bicarbonate particles or lithium bicarbonate particles.

4. The liquid cooling plate according to claim 3, characterized in that: the storage container is made of plastic.

5. The liquid cooling plate according to claim 1, characterized in that: the storage container is a columnar shape, one end of which is connected to the liquid guide pipe, and the other end gradually decreases in diameter in the direction toward the discharge port.

6. The liquid cooling plate according to claim 5, characterized in that: the connection part of the storage container and the liquid guide pipe is located above the central axis of the storage container.

7. The liquid cooling plate according to claim 5, characterized in that: the liquid guide pipe is connected to the storage container along the tangent direction of the storage container.

8. The liquid cooling plate according to claim 1, characterized in that: one end of the liquid guide pipe arranged on the plate body is provided with an inlet pipe and an outlet pipe, and the flow channel is communicated between the inlet pipe and the outlet pipe.

9. A battery pack, characterized in that: the battery pack is equipped with the liquid cooling plate according to any one of claims 1 to 8. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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