Energy storage battery pack

Abstract

The utility model discloses an energy storage battery pack which comprises a lower box body, a battery module, a sealing cover, an upper cover, an explosion-proof valve and a smoke exhaust pipe, the battery module is arranged in the lower box body, the upper cover covers the top of the lower box body, a plurality of wire passing holes are formed in the sealing cover, and the explosion-proof valve is arranged on the upper cover. The sealing cover is arranged on the lower box body in a sealing manner, and pole pieces on the battery modules penetrate through the wire passing holes, so that an upper cabin and a lower cabin are formed in the battery pack; an anti-explosion valve is arranged on the sealing cover and connected with a smoke exhaust pipe penetrating through the upper cover. The battery pack has the advantages that the battery module in the lower cabin is soaked in the cooling liquid, so that the heat dissipation temperature of the battery module is uniform, the risk of thermal runaway of the battery pack is greatly reduced, and the manufacturing cost of the battery pack is reduced as the non-insulating cooling liquid can be filled in the lower cabin.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage battery packs, in particular to an energy storage battery pack. Background Art

[0002] The battery energy storage system has multiple centralized battery packs composed of series and parallel circuits. Most battery packs include a box and a battery module located inside the box. As the battery energy density gradually increases, the chemical system of the battery cells installed in the battery module gradually develops towards high energy density, and the battery cell volume becomes larger and larger. When the high-energy density battery cells fail thermally, they release high-temperature heat flow, which is easy to burn when it comes into contact with air after leakage, and then a fire occurs. In addition, flammable and explosive gases such as carbon monoxide and alkanes will be produced during the battery reaction and combustion process. They are difficult to extinguish and easy to reignite. Once a fire occurs, it will cause significant economic losses.

[0003] The current mainstream prevention solution is to use a cold plate liquid cooling system to dissipate heat for battery cells. However, when the cold plate liquid cooling system conducts heat dissipation through contact between the cold plate and the battery surface, the battery temperature will also show a gradient change based on the distance from the cold plate. The difference in the layout of the cold plate will seriously affect its heat dissipation performance, and the cold plate heat dissipation temperature uniformity is poor, and the battery pack is at risk of thermal runaway. Utility Model Content

[0004] The technical problem to be solved by the present invention is how to reduce the risk of thermal runaway of a battery pack.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] An energy storage battery pack comprises a lower box body, a battery module, a sealing cover, an upper cover, an explosion-proof valve and a smoke exhaust pipe, wherein the battery module is arranged in the lower box body, the upper cover is arranged on the top of the lower box body, a plurality of wire passing holes are arranged on the sealing cover, the sealing cover is sealingly arranged on the lower box body and the pole pieces on the battery module pass through the wire passing holes, so that the battery pack forms an upper compartment and a lower compartment; the sealing cover is provided with an explosion-proof valve, and the explosion-proof valve is connected to the smoke exhaust pipe passing through the upper cover.

[0007] The battery modules in the lower compartment of the battery pack can be immersed in coolant, so that the heat dissipation temperature of the battery modules is uniform, which greatly reduces the risk of thermal runaway of the battery pack; through the setting of the exhaust pipe, the high-temperature gas discharged after the battery valve in the battery pack is depressurized and discharged after thermal runaway can be guided to avoid affecting other battery packs in the energy storage system. In addition, since the sealing cover completely separates the upper compartment and the lower compartment, the high-voltage circuit system is in the upper compartment, so that the lower compartment can be filled with non-insulated coolant, reducing the production cost of the battery pack.

[0008] Preferably, a first coolant inlet and a first coolant outlet are provided on the lower box body of the lower compartment.

[0009] Preferably, the height of the first coolant inlet is higher than the height of the first coolant outlet.

[0010] Preferably, an insulating pad layer is also provided at the bottom of the battery module.

[0011] Preferably, the sealing cover is sealed and bonded to the lower box body and the tabs on the battery module by means of a sealant.

[0012] Preferably, the upper cover is provided with a second coolant inlet and a second coolant outlet.

[0013] Preferably, the height of the second coolant inlet is higher than the height of the second coolant outlet.

[0014] Preferably, a check valve is provided on the smoke exhaust pipe.

[0015] Preferably, an exhaust fan is provided on the smoke exhaust pipe.

[0016] Preferably, a plurality of temperature sensors are provided in the upper chamber and the lower chamber.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. Since the sealing cover completely separates the upper compartment from the lower compartment, the upper compartment is an independent compartment for the high-voltage circuits such as the pole ears, explosion-proof valves, and high-voltage busbars on the battery module. This part does not undergo additional temperature control under normal conditions. When a battery thermal runaway signal is detected, coolant is injected to prevent thermal runaway of the battery pack, thereby ensuring the safety of the rectified energy storage system. The lower compartment is the compartment where the battery cell body on the battery pack module is located. There is no high-voltage connection in this compartment. The temperature of the battery pack is controlled by controlling the entry and discharge of the coolant in the lower compartment. Since the battery module in the lower compartment is immersed in the coolant, the heat dissipation temperature of the battery module is uniform, which greatly reduces the risk of thermal runaway of the battery pack.

[0019] 2. Through the setting of the exhaust pipe, the high-temperature gas discharged after the thermal runaway of the battery valve in the battery pack can be guided to avoid affecting other battery packs in the energy storage system.

[0020] 3. Since the sealing cover completely separates the upper compartment and the lower compartment, the high-voltage circuit system is in the upper compartment, so that the lower compartment can be filled with non-insulated coolant, reducing the production cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the installation of the battery module and the sealing cover according to an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to facilitate those skilled in the art to understand the technical solution of the utility model, the technical solution of the utility model is further explained in conjunction with the drawings in the specification.

[0024] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically limited.

[0026] See also Figure 1 to Figure 2 This embodiment discloses an energy storage battery pack, including a lower box body 1, a battery module 2, a sealing cover 3, an upper cover 4, an explosion-proof valve 5 and a smoke exhaust pipe 6. The lower box body 1 is a box body with an open top, and the battery module 2 is arranged in the lower box body 1. The upper cover 4 is arranged on the top of the lower box body 1. The sealing cover 3 is provided with a plurality of wire holes 31. The sealing cover 3 is sealed on the lower box body 1 and the pole piece on the battery module 2 passes through the wire holes 31, so that the battery pack forms an upper compartment and a lower compartment. Specifically, the sealing cover 3 is sealed with the lower box body 1 and the pole piece on the battery module 2 by means of sealant bonding, hot melting or welding, so that the upper compartment and the lower compartment are completely separated. Further, a plurality of temperature sensors (not shown in the figure) are arranged in the upper compartment and the lower compartment, and the actual number and position of the temperature sensors are based on the actual size and structural arrangement of the battery pack.

[0027] A first coolant inlet 11 and a first coolant outlet 12 are provided on the lower box body 1 of the lower compartment. The height of the first coolant inlet 11 is higher than the height of the first coolant outlet 12 .

[0028] An insulating cushion layer (not shown) is also provided at the bottom of the battery module 2 .

[0029] The upper cover 4 is provided with a second coolant inlet 41 and a second coolant outlet 42 . The height of the second coolant inlet 41 is higher than that of the second coolant outlet 42 .

[0030] The sealing cover 3 is provided with an explosion-proof valve 5, and the explosion-proof valve 5 is connected to a smoke exhaust pipe 6 that passes through the upper cover 4. The smoke exhaust pipe 6 is used to guide the high-temperature gas discharged after the battery valve in the battery pack is thermally runaway to avoid affecting other battery packs in the energy storage system. Multiple battery packs in the system share a main smoke exhaust pipe, and the far end of the pipe is connected to the exhaust gas treatment system.

[0031] Furthermore, a check valve (not shown) is provided on the smoke exhaust pipe 6 to prevent gas backflow.

[0032] Furthermore, an exhaust fan (not shown) is provided at one end of the exhaust pipe 6 away from the upper cover to assist in exhausting gas.

[0033] In this embodiment, the sealing cover 3 completely separates the upper compartment from the lower compartment, wherein the upper compartment is an independent compartment for the high-voltage circuits such as the pole ear, explosion-proof valve, and high-voltage busbar on the battery module 2. This part does not perform additional temperature control under normal conditions. When a battery thermal runaway signal is detected, coolant is injected to prevent thermal runaway of the battery pack, thereby ensuring the safety of the rectified energy storage system. The lower compartment is the compartment where the battery cell body on the battery pack module 2 is located. There is no high-voltage connection in this compartment. The temperature of the battery pack is controlled by controlling the entry and removal of the coolant through the first coolant inlet 11 and the first coolant outlet 12. Since the battery module in the lower compartment is immersed in the coolant, the heat dissipation temperature of the battery module is uniform, which greatly reduces the risk of thermal runaway of the battery pack.

[0034] It should also be noted that, since the sealing cover 3 completely separates the upper compartment and the lower compartment, the high-voltage circuit system is in the upper compartment, so that the lower compartment can be filled with non-insulated coolant, reducing the production cost of the battery pack.

[0035] In addition, by providing the exhaust pipe 6, the high-temperature gas discharged after the thermal runaway of the battery valve in the battery pack can be guided to avoid affecting other battery packs in the energy storage system.

[0036] It is obvious 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 present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0037] The above-described embodiments merely represent implementation methods of the utility model, and the protection scope of the utility model is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, and these all fall within the protection scope of the utility model.

Claims

1. An energy storage battery pack, characterized in that: It includes a lower box body, a battery module, a sealing cover, an upper cover, an explosion-proof valve and a smoke exhaust pipe. The battery module is arranged in the lower box body, the upper cover is arranged on the top of the lower box body, and a plurality of wire holes are arranged on the sealing cover. The sealing cover is sealingly arranged on the lower box body and the pole pieces on the battery module pass through the wire holes, so that the battery pack forms an upper compartment and a lower compartment; the sealing cover is provided with an explosion-proof valve, and the explosion-proof valve is connected to the smoke exhaust pipe passing through the upper cover.

2. The energy storage battery pack according to claim 1, characterized in that: The lower box body of the lower chamber is provided with a first coolant inlet and a first coolant outlet.

3. An energy storage battery pack according to claim 2, characterized in that: The height of the first coolant inlet is higher than the height of the first coolant outlet.

4. The energy storage battery pack according to claim 1, characterized in that: An insulating pad layer is also provided at the bottom of the battery module.

5. The energy storage battery pack according to claim 1, characterized in that: The sealing cover is sealed and bonded to the lower box body and the tabs on the battery module by means of a sealant.

6. The energy storage battery pack according to claim 1, characterized in that: The upper cover is provided with a second coolant inlet and a second coolant outlet.

7. The energy storage battery pack according to claim 6, characterized in that: The height of the second coolant inlet is higher than the height of the second coolant outlet.

8. The energy storage battery pack according to claim 1, characterized in that: The smoke exhaust pipe is provided with a check valve.

9. The energy storage battery pack according to claim 1, characterized in that: The smoke exhaust pipe is provided with an exhaust fan.

10. The energy storage battery pack according to claim 1, characterized in that: A plurality of temperature sensors are arranged in the upper compartment and the lower compartment.

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