Battery cell assembly

Abstract

The utility model discloses a battery cell assembly, which comprises a plurality of battery cell units which are arranged in a laminated manner, each battery cell unit comprises a frame body and a battery cell, the battery cells are arranged in the frame bodies, each frame body is internally provided with a fire extinguishing structure, and when one battery cell is in thermal runaway, the fire extinguishing structure is arranged in the frame bodies. And the fire extinguishing structure in the same frame body with the battery cell is used for extinguishing the fire of the battery cell. The fire extinguishing device is simple and compact in structure, can quickly and accurately extinguish the battery cell with thermal runaway, is accurate in positioning, and improves the safety of the battery cell assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery core assembly. Background Art

[0002] Secondary batteries have many advantages, but they also have disadvantages, mainly that they are prone to spontaneous combustion when out of control. Currently, the battery pack in the secondary battery box mainly uses a liquid cooling plate to dissipate heat, and the battery box has a built-in gas fire extinguishing device to extinguish the fire, but this fire extinguishing method cannot accurately locate the out-of-control battery cell, and the fire extinguishing efficiency is low. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a battery cell assembly with a simple and compact structure, which can quickly and accurately extinguish a battery cell that has thermal runaway, accurately position it, and improve the safety of the battery cell assembly.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A battery cell assembly comprises a plurality of stacked battery cell units, each of which comprises a frame and a battery cell. The battery cell is installed in the frame, and a fire extinguishing structure is provided in each of the frames. When a battery cell has thermal runaway, the fire extinguishing structure in the same frame as the battery cell extinguishes the fire of the battery cell.

[0006] In one embodiment, the frame includes a substrate and a diffusion plate. The substrate and the diffusion plate are detachably connected along the thickness direction of the frame. The battery cell is fixed to a side of the diffusion plate away from the substrate. The fire extinguishing structure is arranged on the substrate. The fire extinguishing medium can be introduced into the fire extinguishing structure, and the fire extinguishing medium is diffused outside the frame through the diffusion plate.

[0007] In one embodiment, the fire extinguishing structure includes a flow channel disposed on the substrate, and the fire extinguishing medium flows in the flow channel.

[0008] In one embodiment, the flow channel includes a gas flow channel, the gas flow channel is arranged on a side of the substrate close to the diffusion plate, the fire extinguishing medium includes a gas fire extinguishing agent, and the gas flow channel is used to circulate the gas fire extinguishing agent.

[0009] In one embodiment, a plurality of overflow ports and / or overflow holes are provided on the diffusion plate at positions corresponding to the gas flow channels.

[0010] In one embodiment, the flow channel includes a liquid flow channel, the liquid flow channel is arranged on a side of the substrate close to the diffusion plate, the fire extinguishing medium includes a coolant, and the liquid flow channel is used to circulate the coolant.

[0011] In one embodiment, the flow channel includes independently arranged gas flow channel and liquid flow channel; the gas flow channel and the liquid flow channel are both arranged on a side of the substrate close to the diffusion plate, the fire extinguishing medium includes a gas fire extinguishing agent and a coolant, the gas flow channel is used to circulate the gas fire extinguishing agent, and the liquid flow channel is used to circulate the coolant; the gas flow channel and the liquid flow channel intersect to form a connecting point.

[0012] In one embodiment, the fire extinguishing structure also includes a temperature sensing structure, which is arranged at the connection between the gas flow channel and the liquid flow channel. When the temperature of the battery cell is greater than the set temperature, the temperature sensing structure opens, and the coolant flows from the liquid flow channel into the gas flow channel and then overflows through the diffusion plate.

[0013] In one embodiment, the temperature sensing structure is a temperature sensing glass liquid column, and when the temperature of the battery cell is greater than a set temperature, the temperature sensing glass liquid column breaks.

[0014] In one embodiment, the fire extinguishing structure further includes a temperature detection line. A mounting groove is provided on the substrate adjacent to the flow channel. The temperature detection line is installed in the mounting groove. One end of the temperature detection line is located outside the substrate.

[0015] In one embodiment, a liquid inlet and a liquid outlet are provided on the substrate, the liquid inlet is connected to one end of the liquid flow channel, and the liquid outlet is connected to the other end of the liquid flow channel.

[0016] In one embodiment, a gas inlet is provided on the substrate, and the gas inlet is communicated with the gas flow channel.

[0017] In one embodiment, a plurality of support blocks are fixed on the gas flow channel for supporting the diffusion plate.

[0018] In one embodiment, each of the battery cell units further includes an upper cover plate, the upper cover plate is located on a side of the battery cell away from the frame body, and the upper cover plate is connected to the frame body.

[0019] The beneficial effect of the utility model is that by arranging a fire extinguishing structure in each frame in which the battery cells are installed, when a battery cell has thermal runaway, the fire extinguishing structure corresponding to the battery cell can quickly and accurately extinguish the battery cell with thermal runaway, and the positioning is accurate, which solves the current problem that the heat dissipation of the battery cell is limited and the fire extinguishing structure cannot accurately locate the position of the runaway battery cell, greatly improves the accuracy and timeliness of extinguishing the fire of a single battery cell with thermal runaway, and improves the safety of the battery cell assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the exploded structure of a battery cell unit according to an embodiment of the utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the fire extinguishing structure on the substrate;

[0023] Figure 3 yes Figure 1 Schematic diagram of flow channel distribution structure on the substrate;

[0024] Figure 4 yes Figure 1 A schematic diagram of the structure of the diffuser plate;

[0025] Figure 5 It is a schematic diagram of the structure after the support block is arranged on the substrate;

[0026] Figure 6 yes Figure 2 and Figure 4 A partial cross-sectional view along line AA after the frame is connected;

[0027] Figure 7 It is a schematic diagram of the structure of a battery cell assembly formed by stacking multiple battery cell units.

[0028] In the figure: 100, battery cell unit; 1, frame; 11, substrate; 111, liquid inlet; 112, liquid outlet; 113, air inlet; 114, mounting groove; 12, diffusion plate; 121, overflow port; 122, overflow hole; 2, fire extinguishing structure; 21, flow channel; 211, gas flow channel; 212, liquid flow channel; 22, temperature-sensitive glass liquid column; 23, temperature detection line; 24, fixing buckle; 25, support block; 3, battery cell; 4, upper cover; 5, pipeline. DETAILED DESCRIPTION

[0029] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0032] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0033] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0034] The utility model provides a battery core component, such as Figures 1 to 7 As shown, it includes a plurality of stacked battery cell units 100, each of which includes a frame 1 and a battery cell 3. The battery cell 3 is installed in the frame 1, and a fire extinguishing structure 2 is provided in each frame 1. When a battery cell 3 has thermal runaway, the fire extinguishing structure 2 in the same frame 1 as the battery cell 3 extinguishes the battery cell 3. In this embodiment, by providing a fire extinguishing structure 2 in each frame 1 where the battery cell 3 is installed, when a certain battery cell 3 has thermal runaway, the fire extinguishing structure 2 corresponding to the battery cell 3 can quickly and accurately extinguish the thermal runaway battery cell 3, and the positioning is accurate, which solves the problem that the heat dissipation of the current battery cell 3 is limited, and the fire extinguishing structure 2 cannot accurately locate the position of the runaway battery cell 3, greatly improves the accuracy and timeliness of extinguishing the thermal runaway single battery cell 3, and improves the safety of the battery cell assembly.

[0035] As an implementation method, Figure 1 As shown, the frame 1 includes a substrate 11 and a diffuser plate 12. Along the thickness direction D of the frame 1, the substrate 11 and the diffuser plate 12 are stacked and detachably connected. The battery cell 3 is fixed to a side of the diffuser plate 12 away from the substrate 11. The fire extinguishing structure 2 is arranged on the substrate 11. The fire extinguishing medium can be introduced into the fire extinguishing structure 2, and the fire extinguishing medium is diffused outside the frame 1 through the diffuser plate 12.

[0036] As an implementation method, Figures 1 to 3 As shown, the fire extinguishing structure 2 includes a flow channel 21 disposed on the substrate 11 , and the fire extinguishing medium flows in the flow channel 21 .

[0037] As an implementation method, Figures 1 to 3 As shown, the flow channel 21 includes a gas flow channel 211, and the gas flow channel 211 is arranged on a side of the substrate 11 close to the diffusion plate 12, so that the diffusion plate 12 can block the gas flow channel 211, and the fire extinguishing medium includes a gas fire extinguishing agent, and the gas flow channel 211 is used to circulate the gas fire extinguishing agent. When the battery cell 3 is abnormally heated, the gas fire extinguishing agent is injected into the gas flow channel 211 on the substrate 11 through the air inlet 113, and the gas fire extinguishing agent is diffused to one side of the battery cell 3 through the diffusion plate 12, thereby dissipating heat and extinguishing the fire of the battery cell 3.

[0038] As an implementation method, Figure 4 and Figure 7 As shown, a plurality of overflow ports 121 and / or overflow holes 122 are provided on the diffusion plate 12 at positions corresponding to the gas flow passages 211 , and the overflow ports 121 and the overflow holes 122 are used for the gas fire extinguishing agent to flow out.

[0039] As an implementation method, Figures 1 to 3 As shown, the flow channel 21 includes a liquid flow channel 212, and the liquid flow channel 212 is arranged on the side of the substrate 11 close to the diffuser plate 12. The fire extinguishing medium includes a coolant, and the liquid flow channel 212 is used to circulate the coolant. Among them, the U-shaped liquid flow channel 212 is arranged on the substrate 11. When the diffuser plate 12 is connected and fixed to the substrate 11, the diffuser plate 12 can seal the liquid flow channel 212; or, a sealed serpentine liquid flow channel 212 is directly arranged on the substrate 11. In this embodiment, coolant is stored in the liquid flow channel 212. When thermal runaway does not occur, the substrate 11 acts as a cold plate. When thermal runaway occurs, the coolant flows out of the liquid flow channel 212 into the gas flow channel 211, and then diffuses and flows out through the overflow port 121 and / or the overflow hole 122 on the diffuser plate 12, thereby cooling the battery cell 3 and extinguishing the fire.

[0040] As an implementation method, Figures 1 to 3 As shown, the flow channel 21 includes independently arranged gas flow channel 211 and liquid flow channel 212; the gas flow channel 211 and the liquid flow channel 212 are both arranged on one side of the substrate 11 close to the diffusion plate 12, the fire extinguishing medium includes gas fire extinguishing agent and coolant, the gas flow channel 211 is used to circulate the gas fire extinguishing agent, and the liquid flow channel 212 is used to circulate the coolant; the gas flow channel 211 and the liquid flow channel 212 intersect to form a connecting point.

[0041] As an implementation method, Figure 2As shown, the fire extinguishing structure 2 also includes a temperature sensing structure, which is arranged at the connection between the gas flow channel 211 and the liquid flow channel 212. When the temperature of the battery cell 3 is greater than the set temperature, the temperature sensing structure opens, and the coolant flows from the liquid flow channel 212 into the gas flow channel 211, and then overflows through the diffusion plate 12. The set temperature is the temperature when the battery cell is thermally runaway.

[0042] As an implementation method, Figure 1 and Figure 2 As shown, the temperature sensing structure is a temperature sensing glass liquid column 22. When the temperature of the battery cell 3 is greater than the set temperature, the temperature sensing glass liquid column 22 breaks. A fixing buckle 24 is provided on the gas flow channel 211 corresponding to the temperature sensing glass liquid column 22 to fix the temperature sensing glass liquid column 22. When a battery cell 3 experiences abnormal temperature rise, the gas fire extinguishing agent is first injected into the gas flow channel 211 in the frame 1 corresponding to the battery cell 3 through an external gas injection device, and then the gas fire extinguishing agent is sprayed to the battery cell 3 through the gas flow channel 211 and the diffusion plate 12, so as to reduce the temperature of the battery cell 3 and inhibit the reaction; when the gas fire extinguishing agent cannot be used for effective control, and the temperature continues to rise to the temperature of thermal runaway of the battery cell, the temperature-sensitive glass liquid column 22 breaks, and the liquid flow channel 212 is connected to the gas flow channel 211 at this time, and the coolant stored in the liquid flow channel 212 enters the gas flow channel 211, and then overflows through the diffusion plate 12, so that the thermally runaway battery cell 3 can be immersed in the coolant, which can quickly cool down and extinguish the fire.

[0043] As an implementation method, Figure 1 and Figure 2 As shown, the fire extinguishing structure 2 also includes a temperature detection line 23. A mounting groove 114 is provided on the substrate 11 at a position adjacent to the flow channel 21. The mounting groove 114 can be provided between the gas flow channel 211 and the liquid flow channel 212. The temperature detection line 23 is installed in the mounting groove 114. One end of the temperature detection line 23 is located outside the substrate 11. By detecting the temperature of the frame 1 through the temperature detection line 23, it is possible to monitor whether the temperature of the battery cell 3 is normal. If an abnormal battery cell 3 occurs, it can be cooled and extinguished in time. Among them, one end of the temperature detection line 23 is located outside the substrate 11, which can take into account the external ambient temperature of the frame 1, and the temperature control data is more comprehensive. Of course, as Figure 1 As shown, the temperature detection lines 23 may also be disposed in the frame 1 .

[0044] As an implementation method, Figure 1 and Figure 3As shown, the substrate 11 is provided with a liquid inlet 111 and a liquid outlet 112. The liquid inlet 111 is connected to one end of the liquid flow channel 212, and the liquid outlet 112 is connected to the other end of the liquid flow channel 212. The coolant is injected into the liquid flow channel 212 on the substrate 11 through the liquid inlet 111, and the coolant serves as a heat dissipation medium for the battery cell 3. When the substrate 11 is used as a cold plate, the coolant is injected into the substrate 11 through the liquid inlet 111, flows along the liquid flow channel 212 (along the Figure 3 The liquid flows in the direction indicated by the arrow in the figure), and then is discharged through the liquid outlet 112 to cool the battery cell 3.

[0045] As an implementation method, Figure 1 and Figure 3 As shown, an air inlet 113 is provided on the substrate 11 , and the air inlet 113 is connected to the gas flow channel 211 ; when abnormal temperature rise occurs, gas fire extinguishing agent is injected into the gas flow channel 211 on the substrate 11 through the air inlet 113 , and the gas fire extinguishing agent is then diffused through the diffusion plate 12 .

[0046] As an implementation method, Figure 5 and Figure 6 As shown, a plurality of support blocks 25 are fixed on the gas flow channel 211 for supporting the diffuser plate 12; a plurality of support blocks 25 can be provided to improve the anti-deformation capability of the diffuser plate 12; of course, the support blocks 25 may not be provided to reduce the weight of the entire structure.

[0047] As an implementation method, Figures 1 to 7 As shown, each battery cell unit 100 also includes an upper cover plate 4, which is located on the side of the battery cell 3 away from the frame 1, and the upper cover plate 4 is connected to the frame 1, that is, the substrate 11, the diffuser plate 12, the battery cell 3 and the upper cover plate 4 are stacked in sequence from bottom to top to form the battery cell unit 100, and the diffuser plate 12 and the substrate 11 are connected in the thickness direction D to form the frame 1, and the fire extinguishing structure 2 is arranged on the side of the substrate 11 close to the diffuser plate 12. Among them, the liquid inlet 111, the liquid outlet 112 and the air inlet 113 are all installed with pipes 5, which are convenient for introducing gaseous fire extinguishing agent or coolant into the flow channel 21, and also convenient for discharging the coolant from the liquid flow channel 212. Specifically, as Figure 1 , Figure 2 and Figure 7As shown, the temperature detection line 23 detects the temperature of each frame 1. When a certain battery cell 3 of the battery cell assembly heats up abnormally, the temperature detection line 23 can quickly sense and lock the heated battery cell 3. First, the gas fire extinguishing agent is injected into the corresponding gas flow channel 211 through an external gas injection device, and then the gas fire extinguishing agent in the gas flow channel 211 is sprayed to the battery cell 3 through the overflow port 121 and the overflow hole 122 on the diffuser plate 12, which can reduce the temperature of the battery cell 3 and inhibit the reaction; when the gas fire extinguishing agent cannot be effectively controlled, the temperature continues to rise, and the temperature-sensitive glass liquid column 22 breaks. At this time, the liquid flow channel 212 is connected to the gas flow channel 211, and the coolant stored in the liquid flow channel 212 comes into the gas flow channel 211, and then overflows through the overflow port 121 and the overflow hole 122 on the diffuser plate 12, so that the thermal runaway battery cell 3 can be immersed in the coolant, which can quickly cool down and extinguish the fire.

[0048] The working process of the utility model is:

[0049] 1. When in use, the coolant (3M fluorinated liquid) is injected into the liquid flow channel 212 from the liquid inlet 111 , fills the entire liquid flow channel 212 , and flows out from the liquid outlet 112 . The coolant serves as a heat dissipation medium for the battery cell 3 .

[0050] 2. The temperature detection line 23 is closely attached to the surface close to the battery cell side to monitor the temperature of the battery cell 3. When the temperature of the battery cell 3 rises to the out-of-control stage, the gas injection device will be started to inject the gas fire extinguishing agent into the frame 1 through the air inlet hole, and then pass through the overflow hole 122 and the overflow port 121 on the diffuser plate 12 to reach the battery cell 3 for partial cooling.

[0051] 3. After the gaseous fire extinguishing agent is released, the thermal runaway of the battery cell 3 is suppressed, but the battery cell 3 is still reacting. When the fire extinguishing agent is used up and the battery cell 3 continues to heat up to a certain temperature, the temperature-sensitive glass liquid column 22 will rupture, and the gas flow channel 211 and the liquid flow channel 212 will communicate with each other. The coolant flows into the gas flow channel 211 from the hole where the temperature-sensitive glass liquid column 22 is installed, and then passes through the overflow holes 122 and the overflow port 121 on the diffuser plate 12 to reach the battery cell 3 for cooling and extinguishing the fire, and finally immerses the battery cell 3 to achieve the purpose of extinguishing the fire.

[0052] The beneficial effects of the present invention are as follows: in order to solve the problems that the heat dissipation of the current battery cell 3 is limited and the gas fire extinguishing agent cannot accurately locate the position of the out-of-control battery cell 3 after the temperature is reached, the present invention integrates the fire extinguishing structure 2 into the frame 1, which can quickly and accurately extinguish the corresponding single battery cell 3 with accurate positioning; the temperature detection line 23 can effectively monitor the temperature of the battery cell 3, and when the battery cell 3 is thermally out of control, the injected gas fire extinguishing agent can greatly reduce the temperature inhibition reaction of the battery cell 3, and finally, when the situation cannot be effectively controlled, the temperature-sensitive glass liquid column 22 is ruptured to open the channel between the coolant and the battery cell 3, and the coolant is used to immerse the battery cell 3 to achieve flame retardant fire extinguishing, which greatly improves the safety of the battery.

[0053] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A battery cell assembly, characterized in that: The invention comprises a plurality of stacked battery cell units (100), each of the battery cell units (100) comprising a frame (1) and a battery cell (3), the battery cell (3) being installed in the frame (1), and a fire extinguishing structure (2) being provided in each of the frames (1); when a battery cell (3) undergoes thermal runaway, the fire extinguishing structure (2) in the same frame (1) as the battery cell (3) extinguishes the fire of the battery cell (3).

2. The battery cell assembly according to claim 1, characterized in that: The frame (1) comprises a substrate (11) and a diffusion plate (12); along a thickness direction (D) of the frame (1), the substrate (11) and the diffusion plate (12) are detachably connected; the battery cell (3) is fixed to a side of the diffusion plate (12) away from the substrate (11); the fire extinguishing structure (2) is arranged on the substrate (11); a fire extinguishing medium can be introduced into the fire extinguishing structure (2); and the fire extinguishing medium is diffused outside the frame (1) through the diffusion plate (12).

3. The battery cell assembly according to claim 2, characterized in that: The fire extinguishing structure (2) comprises a flow channel (21) arranged on the substrate (11), and the fire extinguishing medium flows in the flow channel (21).

4. The battery cell assembly according to claim 3, characterized in that: The flow channel (21) comprises a gas flow channel (211), the gas flow channel (211) is arranged on a side of the substrate (11) close to the diffusion plate (12), the fire extinguishing medium comprises a gas fire extinguishing agent, and the gas flow channel (211) is used to circulate the gas fire extinguishing agent.

5. The battery cell assembly according to claim 4, characterized in that: The substrate (11) is provided with an air inlet (113), and the air inlet (113) is in communication with the gas flow channel (211).

6. The battery cell assembly according to claim 4, characterized in that: A plurality of support blocks (25) are fixed on the gas flow channel (211) for supporting the diffusion plate (12).

7. The battery cell assembly according to claim 4, characterized in that: A plurality of overflow ports (121) and / or overflow holes (122) are provided on the diffusion plate (12) at positions corresponding to the gas flow channel (211).

8. The battery cell assembly according to claim 3, characterized in that: The flow channel (21) comprises a liquid flow channel (212), the liquid flow channel (212) is arranged on a side of the substrate (11) close to the diffusion plate (12), the fire extinguishing medium comprises a coolant, and the liquid flow channel (212) is used to circulate the coolant.

9. The battery cell assembly according to claim 8, characterized in that: The substrate (11) is provided with a liquid inlet (111) and a liquid outlet (112); the liquid inlet (111) is connected to one end of the liquid flow channel (212), and the liquid outlet (112) is connected to the other end of the liquid flow channel (212).

10. The battery cell assembly according to claim 3, characterized in that: The flow channel (21) comprises a gas flow channel (211) and a liquid flow channel (212) which are independently arranged; the gas flow channel (211) and the liquid flow channel (212) are both arranged on a side of the substrate (11) close to the diffusion plate (12); the fire extinguishing medium comprises a gaseous fire extinguishing agent and a coolant; the gas flow channel (211) is used to circulate the gaseous fire extinguishing agent, and the liquid flow channel (212) is used to circulate the coolant.

11. The battery cell assembly according to claim 10, characterized in that: The gas flow channel (211) and the liquid flow channel (212) meet to form a connection point. The fire extinguishing structure (2) also includes a temperature sensing structure, which is arranged at the connection point between the gas flow channel (211) and the liquid flow channel (212). When the temperature of the battery cell (3) is greater than a set temperature, the temperature sensing structure opens, and the coolant flows from the liquid flow channel (212) into the gas flow channel (211), and then overflows through the diffusion plate (12).

12. The battery cell assembly according to claim 11, characterized in that: The temperature sensing structure is a temperature sensing glass liquid column (22), and when the temperature of the battery core (3) is greater than a set temperature, the temperature sensing glass liquid column (22) breaks.

13. The battery cell assembly according to claim 3, characterized in that: The fire extinguishing structure (2) further comprises a temperature detection line (23); a mounting groove (114) is provided on the substrate (11) at a position adjacent to the flow channel (21); the temperature detection line (23) is mounted in the mounting groove (114); and one end of the temperature detection line (23) is located outside the substrate (11).

14. The battery core assembly according to any one of claims 1 to 13, characterized in that: Each of the battery cell units (100) further comprises an upper cover plate (4), wherein the upper cover plate (4) is located on a side of the battery cell (3) away from the frame body (1), and the upper cover plate (4) is connected to the frame body (1).

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