Battery cell assembly and battery pack

Abstract

The utility model discloses a battery cell assembly and a battery pack, the battery cell assembly comprises: a battery cell, which is provided with an explosion-proof valve; and the liquid cooling plate is arranged in contact with the battery cell, a smoke exhaust channel and a cooling flow channel which are separated from each other are formed in the liquid cooling plate, the liquid cooling plate is provided with a smoke exhaust inlet and a smoke exhaust outlet which are respectively communicated with the smoke exhaust channel, and the smoke exhaust inlet is opposite to the explosion-proof valve. According to the battery cell assembly disclosed by the embodiment of the utility model, a thermal runaway smoke exhaust path is unobstructed, the smoke exhaust channel is directly communicated with the explosion-proof valve of the battery pack, high-temperature gas is quickly exhausted out of the battery pack, and the working safety of the battery pack is ensured.

Description

Technical Field

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

[0002] As the requirements for battery safety and warranty life continue to increase, it is necessary to ensure that the battery cell works in a suitable temperature range to extend the battery life, and the battery cell can promptly discharge high-temperature and high-pressure smoke out of the battery pack to avoid heat diffusion of the entire pack when it is abused and thermal runaway occurs. In the prior art, the path between the battery explosion-proof valve and the exhaust channel is relatively complex or the exhaust path is blocked. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery cell assembly, in which the exhaust path of the battery cell thermal runaway is unobstructed, the exhaust channel is directly connected to the explosion-proof valve of the battery pack, and the high-temperature gas is quickly discharged from the outside of the battery pack to ensure the safety of the battery pack.

[0004] According to the battery cell assembly of the embodiment of the utility model, it includes: a battery cell, which is provided with an explosion-proof valve; a liquid cooling plate, which is arranged in contact with the battery cell, and has spaced-apart smoke exhaust channels and cooling channels formed therein, and the liquid cooling plate is provided with a smoke exhaust inlet and a smoke exhaust outlet respectively connected to the smoke exhaust channel, and the smoke exhaust inlet is directly opposite to the explosion-proof valve.

[0005] According to the battery cell assembly of the embodiment of the utility model, by placing the explosion-proof valve opposite to the smoke exhaust port and connecting the smoke exhaust port to the smoke exhaust channel, when thermal runaway occurs in the battery cell, high-temperature and high-pressure smoke can be discharged through the smoke exhaust channel and the smoke exhaust port in time to ensure the safety of the battery pack.

[0006] According to the battery cell assembly of the embodiment of the utility model, the smoke exhaust inlet and the battery cells are arranged in multiple groups and distributed in one-to-one correspondence, each group has multiple battery cells, and each group has multiple smoke exhaust inlets; wherein the explosion-proof valves of the multiple battery cells in each group are respectively arranged in one-to-one correspondence with the multiple smoke exhaust inlets in each group, and the multiple smoke exhaust inlets in each group share one smoke exhaust channel.

[0007] According to the battery cell assembly of the embodiment of the utility model, the smoke exhaust channel corresponding to each group of the multiple smoke exhaust inlets is provided with one smoke exhaust outlet, and the smoke exhaust outlet is located at the end of the smoke exhaust channel.

[0008] According to the battery cell assembly of the embodiment of the utility model, the multiple smoke exhaust inlets in each group are spaced apart and distributed along the first direction, the smoke exhaust channel is extended along the first direction, and the multiple groups of smoke exhaust inlets are spaced apart along the second direction; wherein the width of the smoke exhaust channel in the second direction is L1, the width of the explosion-proof valve in the second direction is L, and satisfies that L1≥1.2L.

[0009] According to the battery cell assembly of the embodiment of the utility model, the cooling flow channel includes a plurality of sub-flow channels which are bent and connected in sequence and distributed in an S shape, the plurality of sub-flow channels are distributed along the second direction, an accommodation space is formed between two adjacent sub-flow channels, and the smoke exhaust channel is located in the accommodation space.

[0010] According to the battery cell assembly of the embodiment of the utility model, the width of the smoke exhaust channel in the second direction is greater than the width of the cooling channel in the second direction.

[0011] According to the battery cell assembly of the embodiment of the utility model, the liquid cooling plate includes a first plate body and a second plate body connected to each other, the first plate body is constructed in a flat plate shape, and the second plate body is formed with a first flow channel groove and a second flow channel groove on a side facing the first plate body, and after the first plate body and the second plate body are connected, the cooling flow channel is defined at the first flow channel groove and the smoke exhaust channel is defined at the second flow channel groove.

[0012] According to the battery cell assembly of the embodiment of the utility model, the depth of the first flow channel groove is H1, the depth of the second flow channel groove is H2, and the following condition is satisfied: H1<H2.

[0013] According to the battery cell assembly of the embodiment of the utility model, H2≥4mm.

[0014] The utility model embodiment also proposes a battery pack, characterized in that it includes the battery cell assembly according to any one of claims 1-9.

[0015] The advantages of the battery pack described above over the prior art and the advantages of the battery cell assembly described above over the prior art are the same and will not be elaborated herein.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a schematic structural diagram of the connection between the battery cell and the liquid cooling plate of the battery cell assembly of the embodiment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of a liquid cooling plate of a battery cell assembly according to an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the internal flow channel of the liquid cooling plate of the battery core assembly of the embodiment of the utility model;

[0021] Figure 4 It is a cross-sectional view of a liquid cooling plate of a battery cell assembly according to an embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram of the positional relationship between the battery cell and the explosion-proof valve of the battery cell assembly according to an embodiment of the utility model.

[0023] Reference numerals:

[0024] Battery cell assembly 100,

[0025] Liquid cooling plate 1, smoke exhaust inlet 11, smoke exhaust outlet 12, vertical connection portion 121, bend 122, cooling channel 13, sub-channel 131, smoke exhaust channel 14, cooling liquid inlet and outlet 15, first plate body 16, second plate body 17, second channel groove 18, first channel groove 19,

[0026] Battery cell 2, electrode 21, explosion-proof valve 3. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] Reference below Figure 1-Figure 5 Description According to the battery cell assembly 100 of the embodiment of the utility model, the thermal runaway smoke exhaust path is unobstructed, the smoke exhaust channel 14 is directly connected to the battery pack explosion-proof valve 3, and the high-temperature gas is quickly discharged to the outside of the battery pack to avoid arcing caused by high-pressure gas and secondary thermal runaway, thereby ensuring the safety of the battery pack operation.

[0029] like Figure 1-Figure 5 As shown, the battery cell assembly 100 according to the embodiment of the utility model includes: a battery cell 2 and a liquid cooling plate 1.

[0030] The battery cell 2 is provided with an explosion-proof valve 3; the liquid cooling plate 1 is provided in contact with the battery cell 2, and the contact here can be direct contact heat conduction, and also includes contact through a thermal conductive adhesive. A smoke exhaust channel 14 and a cooling channel 13 separated from each other are formed in the liquid cooling plate 1, and the liquid cooling plate 1 is provided with a smoke exhaust inlet 11 and a smoke exhaust outlet 12 respectively connected to the smoke exhaust channel 14, and the smoke exhaust inlet 11 is directly opposite to the explosion-proof valve 3.

[0031] In practice, the explosion-proof valve 3 can be arranged at the bottom or side of the battery core 2, and the explosion-proof valve 3 and the electrode 21 are on different sides, so that the explosion-proof valve 3 can avoid the electrode 21. Figure 1 At the bottom of the battery cell 2, the electrode 21 is arranged on the upper part of the battery cell 2. When an abnormal situation occurs inside the battery, such as overcharging, over-discharging, short circuit, etc., the explosion-proof valve 3 at the bottom of the battery cell 2 can cut off the battery current in time to avoid accidents such as fire and explosion of the battery, and ensure personal and property safety. The explosion-proof valve 3 at the bottom of the battery cell 2 can reduce the pressure burden of the battery and avoid damage caused by excessive pressure on the battery, thereby extending the service life of the battery.

[0032] Specifically, the smoke exhaust channel 14 can be integrally formed with the liquid cooling plate 1, or connected to the liquid cooling plate 1 by pipelines, etc. to form the smoke exhaust channel 14. The smoke exhaust channel 14 can be configured as a straight strip channel connecting the smoke exhaust inlet 11 and the smoke exhaust outlet 12, or a curved channel connecting the smoke exhaust inlet 11 and the smoke exhaust outlet 12. It can be designed according to actual conditions. The embodiment of the utility model configures the smoke exhaust channel 14 as a straight strip channel and is integrated with the liquid cooling plate 1, so that the integration is higher and the smoke exhaust is smoother.

[0033] The liquid cooling plate 1 is mainly used to cool the battery cell 2 to prevent the battery cell 2 from being overheated. A smoke exhaust inlet is provided on the liquid cooling plate 1, and the smoke exhaust inlet is directly opposite to the explosion-proof valve 3, so that high-temperature and high-pressure smoke enters the smoke exhaust inlet through the explosion-proof valve 3, and flows to the smoke exhaust channel 14 through the smoke exhaust inlet, and the smoke exhaust outlet 12 is provided on the outside of the liquid cooling plate 1, and the high-temperature and high-pressure gas of the battery cell 2 is quickly discharged through the smoke exhaust outlet 12.

[0034] Therefore, the smoke exhaust inlet 11 of the embodiment of the utility model is directly opposite to the explosion-proof valve 3 and is connected to the smoke exhaust channel 14, so that when thermal runaway occurs in the battery cell 2, smoke exhaust can be smoother and quickly discharged to the outside of the battery pack. The high-pressure gas cannot be discharged into the battery pack, avoiding arcing and secondary thermal runaway.

[0035] In some embodiments, the smoke exhaust inlets 11 and the battery cells 2 are arranged in multiple groups and distributed in one-to-one correspondence, each group has multiple battery cells 2, and each group has multiple smoke exhaust inlets 11; wherein, the explosion-proof valves 3 of the multiple battery cells 2 in each group are respectively arranged in one-to-one correspondence with the multiple smoke exhaust inlets 11 in each group, and the multiple smoke exhaust inlets 11 in each group share a smoke exhaust channel 14.

[0036] Combination Figure 1 and Figure 2 As shown, multiple battery cells 2 in each group can form a battery module, and an explosion-proof valve 3 is correspondingly provided at the bottom of each battery cell 2, and the explosion-proof valve 3 of each battery cell 2 corresponds one by one to the smoke exhaust inlet 11 of each group; as in the embodiment of the utility model, each group of smoke exhaust inlets 11 is set to seven, and each battery module is set to seven battery cells 2, that is, when any battery cell 2 or multiple battery cells 2 have thermal runaway, the high-temperature and high-pressure gas can be discharged to the smoke exhaust channel 14 in time; of course, the smoke exhaust inlet 11 of the embodiment of the utility model can be designed according to the actual number of battery cells 2.

[0037] In addition, the smoke exhaust inlets 11 corresponding to the multiple explosion-proof valves 3 of a battery module share one smoke exhaust channel 14, which can reduce the setting of the smoke exhaust channel 14, and the smoke exhaust channels 14 corresponding to the multiple smoke exhaust inlets 11 extend along the distribution direction of the multiple smoke exhaust inlets 11 of each group, which can also save space for setting the smoke exhaust channels 14.

[0038] In some embodiments, the smoke exhaust channel 14 corresponding to each group of the multiple smoke exhaust inlets 11 is provided with a smoke exhaust outlet 12 , and the smoke exhaust outlet 12 is located at the end of the smoke exhaust channel 14 .

[0039] Reference Figure 2 As shown, the smoke exhaust outlet 12 and the smoke exhaust inlet 11 are arranged at both ends of the smoke exhaust channel 14, and the gas entering through the smoke exhaust inlet 11 can directly reach the position of the smoke exhaust outlet 12, and the exhaust is smooth. In the embodiment of the utility model, the smoke exhaust outlet 12 is arranged as a curved structure, and the curved structure includes a vertical connection part 121 and a curved part 122, the vertical connection part 121 is connected to the liquid cooling plate 1, and the curved part 122 is arranged as a whole with the vertical connection part 121, and is bent in the direction away from the position of the battery cell 2. The structural design of the smoke exhaust outlet 12 can more conveniently discharge the smoke to the area outside the battery cell 2, and prevent the smoke from concentrating at the position of the liquid cooling plate 1, and affecting the liquid cooling plate 1 or the battery cell 2.

[0040] In some embodiments, each group of multiple smoke exhaust inlets 11 are spaced apart and distributed along the first direction, the smoke exhaust channel 14 is extended along the first direction, and multiple groups of smoke exhaust inlets 11 are spaced apart along the second direction; wherein, the width of the smoke exhaust channel 14 in the second direction is L1, the width of the explosion-proof valve 3 in the second direction is L, and L1≥1.2L is satisfied.

[0041] Firstly, the smoke exhaust channel 14 is extended along the first direction, so that the smoke exhaust outlet 12 of the smoke exhaust channel 14 is easier to set, and the smoke exhaust channel 14 occupies less space in the upper and lower directions of the battery cell 2; moreover, multiple smoke exhaust inlets 11 can share one smoke exhaust channel 14; wherein, the first direction and the second direction intersect, such as the first direction is perpendicular to the second direction, and the width direction of the explosion-proof valve 3 is the second direction, by comparing the width direction of the explosion-proof valve 3 with the width of the smoke exhaust channel 14, and the width of the smoke exhaust channel 14 in the second direction is slightly larger than the width of the explosion-proof valve 3 in the second direction, when the smoke is discharged, the smoke is discharged to the smoke exhaust channel 14 to the greatest extent, and the demand for rapid smoke exhaust can be met, thereby avoiding secondary thermal runaway caused by arcing.

[0042] In some embodiments, the cooling channel 13 includes a plurality of sub-channels 131 that are bent and connected in sequence and distributed in an S shape. The plurality of sub-channels 131 are distributed along the second direction. An accommodation space is formed between two adjacent sub-channels 131, and the smoke exhaust channel 14 is located in the accommodation space.

[0043] Reference Figure 3 As shown, a plurality of sub-channels 131 are arranged in parallel along the second direction, and the same end of two adjacent sub-channels 131 is connected. The cooling channel 13 is arranged to be bent in sequence and connected in an S-shaped distribution, which can increase the flow path of the coolant and make the cooling effect of the coolant on the battery cell 2 better. In actual design, a coolant inlet and outlet 15 is arranged at the end of the liquid cooling plate 1. When the liquid cooling plate 1 is cooled, the coolant enters or flows out through the coolant inlet and outlet 15. For example, one end of the S-shaped cooling channel 13 is arranged at the liquid cooling plate 1 as a coolant inlet, and the other end of the S-shaped cooling channel 13 is arranged at the liquid cooling plate 1 as a coolant outlet.

[0044] At the same time, an accommodating space is formed between two adjacent sub-channels 131, and the accommodating space is used to set up the smoke exhaust channel 14. The smoke exhaust channel 14 is spaced apart from the sub-channels 131 of the cooling channel 13, which can reduce the influence of heat transfer between the smoke in the smoke exhaust channel 14 and the cooling channel 13 when the battery cell 2 has thermal runaway. For example, pasting mica fireproof material inside the smoke exhaust channel 14 can protect the liquid cooling plate 1 from being burned through, and also reduce the heat transfer of the smoke exhaust channel 14 toward the cooling channel 13. In addition, in most cases, as long as the battery cell 2 does not have thermal runaway, its smoke exhaust channel 14 is only used as a backup. Therefore, combining these two aspects, the effect of the cooling channel 13 cooling the battery cell 2 will not be affected by the smoke exhaust channel 14.

[0045] In some embodiments, the width of the smoke exhaust channel 14 in the second direction is greater than the width of the cooling channel 13 in the second direction.

[0046] First, the cooling channel 13 is distributed in an S shape. The path of the cooling channel 13 is longer than that of the smoke exhaust channel 14, which can meet the function of cooling the battery cell. The smoke exhaust channel 14 is wider in the second direction than the sub-channel 131 of the cooling channel 13. In this way, the pressure relief capacity of the smoke exhaust channel 14 is stronger, so that when the battery cell 2 has thermal runaway, the battery cell 2 can be better protected to protect the safety of the battery pack.

[0047] In some embodiments, the liquid cooling plate 1 includes a first plate body 16 and a second plate body 17 connected to each other. The first plate body 16 is constructed in a flat plate shape, and the second plate body 17 is formed with a first flow channel groove 19 and a second flow channel groove 18 on the side facing the first plate body 16. After the first plate body 16 and the second plate body 17 are connected, a cooling flow channel 13 is defined at the first flow channel groove 19 and a smoke exhaust channel 14 is defined at the second flow channel groove 18.

[0048] In practice, the first plate body 16 and the second plate body 17 can be integrally formed, or the first plate body 16 and the second plate body 17 can be welded together as a whole, and the second plate body 17 is recessed along the second direction on one side facing the first plate body 16 to form the first flow groove 19 and the second flow groove 18, that is, the coolant flows into the first flow groove 19, and the high-temperature and high-pressure gas of the thermal runaway of the battery cell 2 flows into the second flow groove 18. By setting the first plate body 16 and the second plate body 17, the first flow groove 19 and the second flow groove 18 can be more conveniently set, and it can be ensured that the first flow groove 19 and the second flow groove 18 can respectively meet the functions of better cooling and smoke exhaust.

[0049] In some embodiments, the depth of the first flow channel groove 19 is H1, the depth of the second flow channel groove 18 is H2, and the following condition is satisfied: H1<H2.

[0050] In practice, the depth of the second flow channel is set deeper than the first flow channel groove 19, which can prevent the ejected material of the battery cell 2 from blocking the exhaust channel 14 and can fully relieve pressure. At the same time, the length of the cooling channel 13 of the liquid cooling plate 1 of the utility model embodiment is longer than the length of the exhaust channel 14, and the depth of the cooling channel 13 can be set shallower, which meets the cooling requirements and saves the space in the longitudinal direction of the liquid cooling plate 1.

[0051] In some embodiments, H2≥4mm. In actual design, H2≥4mm can reduce the blockage of the smoke exhaust channel 14 by the ejection of the battery cell 2. In the embodiment of the utility model, H2=5mm, which is not constrained by the liquid cooling plate 1 being assembled in the limited space at the bottom of the battery pack, and also saves the installation space at the bottom of the battery pack.

[0052] In summary, when designing the exhaust channel 14 and the cooling channel 13, due to the requirement of H1=3mm for the uniform temperature of the battery cell, the coolant flow requirement C*(L3*H1*n*ρ*v^2)*Δt≥the heat exchange requirement of the battery cell is calculated based on the heat generation of the battery cell, where C is the specific heat capacity of the coolant, n is the number of channels, ρ is the coolant density, and v is the flow rate. The L3 is calculated and determined, and it is generally calculated that L3 is between 10 and 15mm. In addition, 15mm≥L2≥5mm can ensure the uniform temperature of the cold plate and the air tightness strength requirements of brazing; L1≥1.2 times the width of the explosion-proof valve can meet the rapid exhaust requirements; H2≥4mm can prevent the battery cell ejection from blocking the exhaust channel. Usually H2=5mm is taken, which can save space at the bottom of the battery pack. The exhaust rate is calculated based on the gas production rate of the battery cell=L3*H2*n*v, where v is the flow rate, and it is calculated that L1 is between 30 and 60mm.

[0053] The utility model embodiment also discloses a battery pack, including the above-mentioned battery cell assembly 100. When the battery cell 2 has thermal runaway, the smoke exhaust channel 14 is directly connected to the battery pack explosion-proof valve 3. The thermal runaway smoke exhaust path is unobstructed and is quickly discharged to the outside of the battery pack, thereby avoiding arcing caused by high-pressure gas and causing secondary thermal runaway, thereby ensuring the safety of the battery pack.

[0054] 1. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0055] 2. In the description of the present utility model, "first feature" and "second feature" may include one or more of these features.

[0056] 3. In the description of this utility model, "plurality" means two or more.

[0057] 4. In the description of the present invention, a first feature “above” or “below” a second feature may include that the first and second features are directly in contact, or may include that the first and second features are not in direct contact but are in contact via another feature between them.

[0058] 5. In the description of the present utility model, the first feature “above”, “above” and “on” the second feature includes the first feature being directly above and diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell assembly, characterized in that: include: A battery cell, wherein the battery cell is provided with an explosion-proof valve; A liquid cooling plate is provided in contact with the battery cell, a smoke exhaust channel and a cooling flow channel are formed in the liquid cooling plate, and the liquid cooling plate is provided with a smoke exhaust inlet and a smoke exhaust outlet respectively connected to the smoke exhaust channel, and the smoke exhaust inlet is directly opposite to the explosion-proof valve.

2. The battery core assembly according to claim 1, characterized in that The smoke exhaust inlets and the battery cells are arranged in multiple groups and distributed in a one-to-one correspondence, each group has multiple battery cells and each group has multiple smoke exhaust inlets; The explosion-proof valves of the multiple battery cells in each group are respectively arranged in one-to-one correspondence with the multiple smoke exhaust inlets in each group, and the multiple smoke exhaust inlets in each group share one smoke exhaust channel.

3. The battery cell assembly according to claim 2, characterized in that: The smoke exhaust passage corresponding to each group of the multiple smoke exhaust inlets is provided with one smoke exhaust outlet, and the smoke exhaust outlet is located at the end of the smoke exhaust passage.

4. The battery core assembly according to claim 2, characterized in that The plurality of smoke exhaust inlets in each group are spaced apart and distributed along a first direction, the smoke exhaust passage is extended along the first direction, and the plurality of groups of smoke exhaust inlets are spaced apart along a second direction; The width of the smoke exhaust channel in the second direction is L1, the width of the explosion-proof valve in the second direction is L, and L1≥1.2L is satisfied.

5. The battery core assembly according to claim 2, characterized in that: The cooling flow channel includes a plurality of sub-flow channels that are bent and connected in sequence and distributed in an S shape. The plurality of sub-flow channels are distributed along the second direction. An accommodation space is formed between two adjacent sub-flow channels, and the smoke exhaust channel is located in the accommodation space.

6. The battery core assembly according to claim 5, characterized in that: The width of the smoke exhaust channel in the second direction is greater than the width of the cooling flow channel in the second direction.

7. The battery cell assembly according to claim 1, characterized in that The liquid cooling plate includes a first plate body and a second plate body connected to each other. The first plate body is constructed in a flat plate shape. The second plate body is formed with a first flow channel groove and a second flow channel groove on the side facing the first plate body. After the first plate body and the second plate body are connected, the cooling flow channel is defined at the first flow channel groove and the smoke exhaust channel is defined at the second flow channel groove.

8. The battery core assembly according to claim 7, characterized in that: The depth of the first flow channel groove is H1, the depth of the second flow channel groove is H2, and they satisfy: H1<H2.

9. The battery cell assembly according to claim 8, characterized in that: H2≥4mm.

10. A battery pack, characterized in that: A battery cell assembly comprising the battery cell assembly according to any one of claims 1 to 9.

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