Battery pack with fire-fighting function

Abstract

The utility model relates to the technical field of energy storage equipment, and particularly discloses a battery pack with a fire-fighting function, which comprises a box body with a containing cavity, a fire-fighting component and a plurality of battery cell modules arranged in the containing cavity, the fire-fighting assembly comprises a plurality of injection pipes correspondingly arranged on one sides of the battery cell modules respectively, a main pipe communicated with the injection pipes and a control module arranged on the injection pipes to control on-off of the injection pipes, the injection pipes are provided with a plurality of injection openings corresponding to the battery cells of the battery cell modules corresponding to the injection pipes, and on the extension paths of the injection pipes, the main pipe is communicated with the main pipe. And the control module is closer to the main pipe than the plurality of jet orifices. When the battery pack with the fire-fighting function provided by the utility model is used and thermal runaway occurs on a certain battery cell module, a fire-fighting agent can be sprayed onto the battery cell module in time through the spraying pipe, and the fire-fighting assembly is more detailed and targeted in preventing thermal runaway of the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage and reserve, and in particular to a battery pack with a fire-fighting function. Background Art

[0002] Among existing battery packs, battery packs using metallic lithium or lithium alloys as positive and negative electrode materials have become mainstream, but due to the chemical properties of lithium, the safety of battery packs is the main obstacle to their large-scale application in electric vehicles, grid energy storage, ships, home energy storage, etc. Especially in grid energy storage, multiple battery packs are connected in series or in parallel, with high energy density. If a battery pack has thermal runaway and spreads to other battery packs, it will cause serious consequences.

[0003] At present, there are two measures to prevent thermal runaway in battery packs. One is to add a layer of insulation film between two adjacent battery cells. Although this method can effectively prevent thermal runaway from occurring between adjacent battery cells, when the battery cell triggers the explosion-proof valve to open during thermal runaway, a high-temperature flame will spray upward from the battery cell, melting holes in the battery pack box. In addition, when multiple battery packs are stacked, the high-temperature flame will penetrate the box of another battery pack upward, and then a chain of thermal runaway will occur. The other is to install a fire hose filled with perfluorohexanone at the front end of the battery cell module. When the battery cell experiences thermal runaway, the perfluorohexanone in the fire hose will fill the interior of the box. This method cannot specifically extinguish the battery cell that has experienced thermal runaway. The fire hose is placed at the front end of the battery cell module and cannot respond to the thermal runaway that occurs at the rear end of the battery cell module in the first place. It can be seen that the existing solutions to prevent thermal runaway of battery packs are still not ideal. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack with a fire protection function which can respond to the thermal runaway of a battery cell module in a timely and targeted manner.

[0005] To achieve the above-mentioned purpose, the utility model proposes a battery pack with fire-fighting function, comprising a box body with a accommodating cavity, a fire-fighting component, and a plurality of battery modules arranged in the accommodating cavity, wherein the battery module includes a plurality of battery cells, and the fire-fighting component includes a plurality of injection pipes respectively arranged on one side of the plurality of battery modules, a main pipe connected to the plurality of injection pipes, and a control module arranged on the injection pipe to control the on and off of the injection pipe, wherein the injection pipe is provided with a plurality of injection ports corresponding to the plurality of battery cells of the corresponding battery module, and on the extension path of the injection pipe, the control module is arranged closer to the main pipe than the plurality of injection ports.

[0006] As a further improvement of the utility model, the battery core includes a core body and an explosion-proof valve arranged on the core body, and the injection port is arranged corresponding to the explosion-proof valve.

[0007] As a further improvement of the present invention, the explosion-proof valve is located on the upper side of the core body, and the injection pipe is located above the battery core module and is spaced apart from the battery core module.

[0008] As a further improvement of the present invention, the injection port is conical, including a first port close to the battery cell module and a second port away from the battery cell module, and the diameter of the first port is greater than the diameter of the second port.

[0009] As a further improvement of the present invention, the injection pipe is made of metal material, and the fire-fighting component also includes an insulating layer arranged on the periphery of the injection pipe.

[0010] As a further improvement of the present invention, the box body further includes an upper cover located above the accommodating cavity, and the fire fighting assembly further includes a plurality of connectors connecting the injection pipe and the upper cover.

[0011] As a further improvement of the present invention, the connecting member includes a connecting portion connected to the upper cover and a supporting portion connected to the connecting portion and supporting the injection pipe.

[0012] As a further improvement of the present invention, the plurality of battery cell modules are arranged at intervals along a first direction, and the plurality of battery cells of each battery cell module are arranged at intervals along a second direction perpendicular to the first direction.

[0013] As a further improvement of the present utility model, four battery cell modules are provided, and the injection pipes include a first injection pipe, a second injection pipe, a third injection pipe and a fourth injection pipe arranged in sequence along the first direction, and the second injection pipe and the third injection pipe extend along the second direction. The fire-fighting component also includes a first three-way joint connected to the second injection pipe, a second three-way joint connected to the third injection pipe, and a connecting pipe connecting the first three-way joint and the second three-way joint. The first injection pipe includes a first straight pipe section extending along the second direction, and a first bent section connecting the first straight pipe section and the first three-way joint. The second injection pipe includes a second straight pipe section extending along the second direction, and a second bent section connecting the second straight pipe section and the second three-way joint.

[0014] As a further improvement of the present invention, the first bending section includes a first separation section and a second separation section that are separated from each other, and the fire protection component also includes a third three-way joint connecting the first separation section, the second separation section and the main pipe.

[0015] Beneficial effects of the utility model:

[0016] In the battery pack with fire-fighting function provided by the utility model, the spray tubes and the battery modules are arranged in one-to-one correspondence. When thermal runaway occurs on a certain battery module, the fire-fighting agent can be promptly sprayed onto the battery module through the spray tube, and the spray tube is provided with a control module for controlling the on and off of the spray tube, so that the fire-fighting component can first spray the fire-fighting agent only on the battery module where thermal runaway occurs. In this case, if the thermal runaway cannot be prevented from spreading, the fire-fighting agent will be sprayed on all the battery modules. The fire-fighting component is more detailed and targeted in preventing thermal runaway of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a battery pack with fire protection function provided by an embodiment of the utility model after removing part of the box body;

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the fire protection component and battery management unit;

[0019] Figure 3 for Figure 1 A top view of the fire protection assembly;

[0020] Figure 4 for Figure 3 The enlarged schematic diagram of point A in the middle;

[0021] Figure 5 It is a schematic diagram of the structure of the connecting parts and part of the injection pipe.

[0022] In the figure:

[0023] 100. Battery pack;

[0024] 10. Box body; 11. Accommodating chamber; 12. Liquid cooling plate;

[0025] 20. Firefighting assembly; 21. Injection pipe; 211. Injection port; 212. First injection pipe; 2121. First straight pipe section; 2122. First bending section; 2123. First separation section; 2124. Second separation section; 213. Second injection pipe; 214. Third injection pipe; 215. Fourth injection pipe; 2151. Second straight pipe section; 2152. Second bending section; 22. Main pipe; 23. Control module; 24. Connector; 241. Connecting part; 242. Supporting part; 25. Connecting pipe; 26. First three-way joint; 27. Second three-way joint; 28. Third three-way joint;

[0026] 30. battery cell module; 31. battery cell; 311. core body; 312. explosion-proof valve;

[0027] 40. Battery management unit. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, the embodiments do not limit the present invention, and any changes in mechanism, method, or function made by a person skilled in the art based on the embodiments are all within the protection scope of the present invention.

[0029] The terms used herein, such as "upper", "lower", "left", "right", "front", "back", etc., which indicate relative spatial positions, are used for the purpose of convenience to describe the relationship between one feature and another feature as shown in the accompanying drawings. It is understood that, depending on the placement of the product, the terms of relative spatial positions may be intended to include different orientations other than those shown in the drawings, and should not be construed as limitations on the claims. In addition, the descriptor "horizontal" used herein is not completely equivalent to being perpendicular to the direction of gravity, and a certain angle of inclination is allowed.

[0030] like Figure 1-5 As shown, an embodiment of the present invention provides a battery pack 100 with a fire protection function, the battery pack 100 includes a box body 10 with a receiving cavity 11, a fire protection component 20, and a plurality of battery cell modules 30 disposed in the receiving cavity 11. For the convenience of description, Figure 1 The X-axis in the figure defines a first direction of the battery pack 100 , the Y-axis defines a second direction of the battery pack 100 , and the Z-axis defines an up-and-down direction of the battery pack 100 .

[0031] The battery cell module 30 includes multiple battery cells 31, and the fire protection component 20 includes multiple injection pipes 21 respectively arranged on one side of the multiple battery cell modules 30, a main pipe 22 connected to the multiple injection pipes 21, and a control module 23 arranged on the injection pipe 21 to control the on and off of the injection pipe 21. The injection pipe 21 is provided with multiple injection ports 211 corresponding to the multiple battery cells 31 of the corresponding battery cell module 30. On the extension path of the injection pipe 21, the control module 23 is arranged closer to the main pipe 22 than the multiple injection ports 211.

[0032] When the battery module 30 needs to be extinguished, the fire-fighting agent can flow from the main pipe 22 to each injection pipe 21, and then be sprayed onto the battery module 30 from the injection port 211 of each injection pipe 21. The control module 23 is used to control the on and off of the injection pipe 21 to control whether the fire-fighting agent can flow from the main pipe 22 to the injection port 211 of the injection pipe 21 controlled by it.

[0033] Under normal conditions, multiple control modules 23 are all in a closed state, and the fire-fighting agent cannot flow from the main pipe 22 to the injection port 211. When a battery cell 31 on a certain battery cell module 30 (for the convenience of description, the battery cell module 30 is set as the first battery cell module) has thermal runaway, the control module 23 on the injection pipe 21 corresponding to the first battery cell module (for the convenience of description, the injection pipe 21 is set as the first injection pipe 212) is opened, so that the fire-fighting agent can flow from the main pipe 22 to the injection port 211 of the first injection pipe 212, and is injected from the injection port 211 to the battery cell 31 of the first battery cell module to reduce the temperature of the battery cell 31 that has thermal runaway. If the injection of the fire-fighting agent to the battery cell 31 of the first battery cell module still cannot prevent the thermal runaway of the battery cell 31 on the first battery cell module, all the control modules 23 are opened, so that the fire-fighting agent can be injected from the injection port 211 on each injection pipe 21 to each battery cell 31 to prevent the spread of thermal runaway. It can be seen that the fire protection component 20 is meticulous and targeted in preventing the battery pack 100 from thermal runaway.

[0034] It is conceivable that the battery pack 100 further includes a plurality of monitoring elements for monitoring the temperature of each battery cell 31, and the monitoring elements are used to monitor whether thermal runaway occurs in the battery cell 31. The plurality of monitoring elements and the control module 23 can be electrically connected to a battery management unit and controlled by the battery management unit.

[0035] Specifically, the battery cell 31 includes a core body 311 and an explosion-proof valve 312 disposed on the core body 311 . The injection port 211 and the explosion-proof valve 312 are disposed correspondingly, so that the fire-fighting agent can be directly injected from the injection port 211 to the explosion-proof valve 312 to prevent the explosion-proof valve 312 from being triggered.

[0036] When the battery pack 100 is in use, the temperature on the upper side of the battery cell 31 is relatively high. Therefore, the spray pipe 21 is located above the battery cell module 30 and is spaced apart from the battery cell module 30. The fire-fighting agent can be sprayed directly from the spray port 211 to the upper side of the battery cell 31 to reduce the temperature of the battery cell 31. The explosion-proof valve 312 is located on the upper side of the core body 311. The battery pack 100 further includes a liquid cooling plate 12 located below the accommodating cavity 11. The liquid cooling plate 12 is in contact with the plurality of battery cells 31 and can absorb and take away the heat from the bottom of the plurality of battery cells 31 to prevent thermal runaway from occurring at the bottom of the battery cells 31.

[0037] In this embodiment, the injection port 211 is conical, including a first port close to the battery cell module 30 and a second port away from the battery cell module 30, and the diameter of the first port is greater than the diameter of the second port, so that the fire-fighting agent sprayed from the injection port 211 can be atomized to better cover the battery cell 31. In other embodiments, the injection port 211 can also be cylindrical, that is, the diameter of the first port is equal to the diameter of the second port.

[0038] In this embodiment, the spray pipe 21 is made of metal material and has a certain structural strength. The fire-fighting assembly 20 also includes an insulating layer arranged on the periphery of the spray pipe 21. The insulating layer can prevent short circuit between the spray pipe 21 and the battery module 30. The box 10 can also be made of metal material. Compared with plastic material, the box 10 made of metal material has better thermal conductivity. When the battery 31 has thermal runaway, the heat can be evenly transferred to all parts of the box 10. In addition, the box 10 made of metal material has a high melting point and is not easy to be burned through. In this way, when multiple battery packs 100 are stacked, thermal runaway in a single battery pack 100 is difficult to spread to other battery packs 100.

[0039] The box body 10 also includes an upper cover (not shown in the figure) located above the accommodating chamber 11, and the fire-fighting assembly 20 also includes a plurality of connectors 24 connecting the injection pipes 21 and the upper cover, and the connectors 24 fix the plurality of injection pipes 21 above the plurality of battery modules 30. Specifically, the connector 24 includes a connecting portion 241 connected to the upper cover, and a supporting portion 242 connected to the connecting portion 241 and supporting the injection pipe 21. The connecting portion 241 can be connected to the upper cover by fasteners such as screws. The injection pipe 21 is a round pipe, and the supporting portion 242 is arc-shaped to fit the injection pipe 21. The supporting portion 242 supports the injection pipe 21 to fix the position of the injection pipe 21. The battery management unit 40 is located on one side of the battery module 30, and the main pipe 22 can pass through and be fixed to the battery management unit 40.

[0040] The plurality of battery modules 30 are arranged at intervals along a first direction, and the plurality of battery cells 31 of each battery module 30 are arranged at intervals along a second direction perpendicular to the first direction. It can be seen that the plurality of battery cells 31 of the plurality of battery modules 30 are distributed in multiple rows and columns. In this embodiment, there are 4 battery modules 30, and each battery module 30 includes 14 battery cells 31. In other embodiments, the number of battery modules 30 and the number of battery cells 31 in each battery module 30 may be different from that in this embodiment, and are not limited here.

[0041] The number and size of the injection ports 211 are set according to the actual fire protection requirements of the battery pack 100. In this embodiment, the number of injection ports 211 on each injection pipe 21 is the same as the number of battery cells 31 of the corresponding battery cell module 30, that is, the injection ports 211 and the battery cells 31 are set in a one-to-one correspondence.

[0042] In this embodiment, the injection pipe 21 includes a first injection pipe 212, a second injection pipe 213, a third injection pipe 214 and a fourth injection pipe 215 which are arranged in sequence along the first direction. The second injection pipe 213 and the third injection pipe 214 extend along the second direction. The fire protection component 20 also includes a first three-way joint 26 connected to the second injection pipe 213, a second three-way joint 27 connected to the third injection pipe 214, and a connecting pipe 25 connecting the first three-way joint 26 and the second three-way joint 27. The first injection pipe 212 is roughly L-shaped, including a first straight pipe section 2121 extending along the second direction, and a first bent section 2122 connecting the first straight pipe section 2121 and the first three-way joint 26. The second injection pipe 213 is also roughly L-shaped, including a second straight pipe section 2151 extending along the second direction, and a second bent section 2152 connecting the second straight pipe section 2151 and the second three-way joint 27.

[0043] The first bending section 2122, the connecting pipe 25 and the second injection pipe 213 are interconnected through the first three-way joint 26, the second bending section 2152, the connecting pipe 25 and the third injection pipe 214 are interconnected through the second three-way joint 27, and the multiple injection pipes 21 are interconnected.

[0044] Furthermore, the first bending section 2122 includes a first separation section 2123 and a second separation section 2124 which are separated from each other, and the firefighting assembly 20 also includes a third three-way joint 28 connecting the first separation section 2123, the second separation section 2124, and the main pipe 22. With the above arrangement, the main pipe 22 is connected to each injection pipe 21, and the firefighting agent in the main pipe 22 can flow to each injection pipe 21.

[0045] In other embodiments, the second bending section 2152 may include a first separation section 2123 and a second separation section 2124 that are separated from each other, or the connecting pipe 25 may include a first separation section 2123 and a second separation section 2124 that are separated from each other.

[0046] It should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0047] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A battery pack with fire-fighting function, comprising a box body with a receiving cavity, a fire-fighting assembly, and a plurality of battery modules arranged in the receiving cavity, wherein the battery module comprises a plurality of battery cells, characterized in that: The fire-fighting component includes a plurality of injection pipes respectively arranged on one side of the plurality of battery modules, a main pipe connected to the plurality of injection pipes, and a control module arranged on the injection pipe to control the on and off of the injection pipe. The injection pipe is provided with a plurality of injection ports corresponding to the plurality of battery cells of the corresponding battery module. On the extension path of the injection pipe, the control module is arranged closer to the main pipe than to the plurality of injection ports.

2. The battery pack with fire-fighting function according to claim 1, characterized in that: The battery core comprises a core body and an explosion-proof valve arranged on the core body, and the injection port is arranged corresponding to the explosion-proof valve.

3. The battery pack with fire-fighting function according to claim 2, characterized in that: The explosion-proof valve is located on the upper side of the core body, and the injection pipe is located above the battery core module and is spaced apart from the battery core module.

4. The battery pack with fire-fighting function according to claim 1, characterized in that: The injection port is conical, including a first port close to the battery cell module and a second port far away from the battery cell module, and a diameter of the first port is greater than a diameter of the second port.

5. The battery pack with fire-fighting function according to claim 1, characterized in that: The spray pipe is made of metal material, and the fire-fighting component also includes an insulating layer arranged on the periphery of the spray pipe.

6. The battery pack with fire-fighting function according to claim 1, characterized in that: The box body also includes an upper cover located above the accommodating cavity, and the fire-fighting assembly also includes a plurality of connectors connecting the injection pipe and the upper cover.

7. The battery pack with fire-fighting function according to claim 6, characterized in that: The connecting member includes a connecting portion connected to the upper cover and a supporting portion connected to the connecting portion and supporting the injection pipe.

8. The battery pack with fire-fighting function according to claim 1, characterized in that: The plurality of battery cell modules are arranged at intervals along a first direction, and the plurality of battery cells of each battery cell module are arranged at intervals along a second direction perpendicular to the first direction.

9. The battery pack with fire-fighting function according to claim 1, characterized in that: The battery cell modules are provided with four, the injection pipes include a first injection pipe, a second injection pipe, a third injection pipe and a fourth injection pipe arranged in sequence along the first direction, the second injection pipe and the third injection pipe extend along the second direction, the fire protection component also includes a first three-way joint connected to the second injection pipe, a second three-way joint connected to the third injection pipe, and a connecting pipe connecting the first three-way joint and the second three-way joint, the first injection pipe includes a first straight pipe section extending along the second direction, a first bent section connecting the first straight pipe section and the first three-way joint, the second injection pipe includes a second straight pipe section extending along the second direction, and a second bent section connecting the second straight pipe section and the second three-way joint.

10. The battery pack with fire-fighting function according to claim 9, characterized in that: The first bending section includes a first separation section and a second separation section which are separated from each other, and the fire protection assembly also includes a third three-way joint which connects the first separation section, the second separation section and the main pipe.

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