A battery cell

Abstract

The application discloses a battery monomer, and belongs to the technical field of batteries. The battery monomer comprises a shell, a containing space, and two side plates arranged opposite along the height direction; an inner core assembly arranged in the containing space; at least one support plate arranged between the inner core assembly and the at least one side plate, and the support plate has a first surface away from the inner core assembly; and a plurality of support pieces arranged on the first surface, wherein the support pieces have a second surface away from the support plate, and the second surface is provided with a flow guide groove along the length direction of the battery monomer. In this way, the support plate arranged between the inner core assembly and the side plate enhances the structural stability of the battery monomer, the flow guide groove on the support piece reserves an exhaust passage, high-temperature gas generated during thermal runaway is quickly discharged, internal pressure is effectively relieved, safety hazards caused by gas accumulation are prevented, and the risk of thermal runaway is reduced.

Description

[0001] This application claims priority to Chinese Patent Application No. 202520252388.8, filed on February 17, 2025, entitled “A Battery Cell”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of battery technology, specifically relating to a battery cell. Background Technology

[0003] In battery manufacturing, to ensure that the electrolyte can fully wet the bare cell, a certain gap is usually left between the bare cell and the casing. This allows the electrolyte to flow from the injection hole at the top of the casing to the bottom and then through the through-hole at the bottom of the casing to fully wet the bare cell. However, the gap between the bare cell and the casing can cause collisions between the bare cell and the casing, leading to damage to the bare cell.

[0004] A lithium battery base plate or battery cell is an accessory in a lithium-ion battery. Traditional base plates or battery cells are rectangular. The bare cell is wrapped with insulating sheets and the base plate after being heat-fused together. The base plate limits the position of the electrode assembly along the height of the cell. Its function is to support the wound or stacked cores, avoid interference between the bare cell and the chamfer at the bottom of the battery casing, and thus prevent the aluminum casing and the bare cell from being squeezed together.

[0005] Considering cost factors, current battery capacities are increasing, and cell sizes are also growing larger, making battery safety issues increasingly prominent, especially thermal runaway safety. Large-capacity lithium-ion batteries generate a large amount of gas during thermal runaway. Their explosion-proof valves are typically located at the bottom; only when the gas flows smoothly to the bottom can the valve open, releasing the gas and heat. Therefore, the key to preventing thermal runaway in lithium batteries lies in solving the problem of reserving venting channels inside the cell. Currently, there is no effective method in the industry for reserving venting channels. Utility Model Content

[0006] This application provides a battery cell with a reserved venting channel to improve the safety of the battery cell.

[0007] This application provides a single battery cell, comprising:

[0008] A housing having a receiving space, and the housing including two side plates arranged opposite each other along the height direction;

[0009] An inner core assembly disposed within the receiving space;

[0010] At least one support plate is disposed between the inner core assembly and at least one side plate, and the support plate has a first surface facing away from the inner core assembly;

[0011] Multiple support members are disposed on the first surface, and each support member has a second surface facing away from the support plate. The second surface has a flow guiding groove formed along the length direction of the battery cell.

[0012] In some embodiments, along the length direction, the size of the support plate is L1, the size of the support member is L2, the number of support members is a, and the battery cell satisfies: 0.25L1≤a×L2≤L1.

[0013] In some embodiments, the size of the support plate along the height direction of the battery cell is H1, and the battery cell satisfies: 0.2mm≤H1≤1.0mm.

[0014] In some embodiments, the battery cell satisfies: 0.2mm≤H1≤0.8mm.

[0015] In some embodiments, the dimension of the support member along the height direction is H2, and the battery cell satisfies: H2≤H1.

[0016] In some embodiments, the flow guide groove has a groove wall, and the maximum distance between the groove wall and the second surface along the height direction is H3, and the battery cell satisfies: 0.5H2≤H3≤H2.

[0017] In some embodiments, the battery cell satisfies: H3 = 2 / 3H2.

[0018] In some embodiments, along the width direction of the battery cell, the flow-guiding groove has two oppositely disposed groove sidewalls and a groove bottom wall connected between the two groove sidewalls;

[0019] Along the width direction, the bottom wall of the groove has a dimension K2, the support plate has a dimension K1, and the battery cell satisfies: 0.5K1≤K2<K1.

[0020] In some embodiments, the battery cell satisfies: K2 = 2 / 3K1.

[0021] In some embodiments, the side plate has a dimension K3 along the width direction, and the battery cell satisfies: 1 / 2K3≤K1≤K3.

[0022] In some embodiments, along the length direction, the orthographic projection shape of the channel wall of the flow guide groove is any one of a rectangle, trapezoid, or semicircle, or other shapes with a flow passage.

[0023] Beneficial Effects: Compared with the prior art, the battery cell provided in this application includes: a housing having a receiving space, and the housing including two side plates disposed opposite each other along the height direction; an inner core assembly disposed within the receiving space; at least one support plate disposed between the inner core assembly and at least one side plate, and the support plate having a first surface facing away from the inner core assembly; and a plurality of support members disposed on the first surface, the support members having a second surface facing away from the support plate, the second surface having a flow guiding groove formed along the length direction of the battery cell. Thus, by providing a support plate between the inner core assembly and the side plates, this application enhances the structural stability of the battery cell. The flow guiding grooves on the support members provide a pre-reserved exhaust channel, quickly discharging high-temperature gas generated during thermal runaway, effectively relieving internal pressure, preventing gas accumulation that could lead to safety hazards, and reducing the risk of thermal runaway. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the core assembly, support plate, and support member in a battery cell provided in an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the structure of the casing in a battery cell provided in an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0028] Figure 4 A schematic diagram of a support plate and support member in a battery cell provided in an embodiment of this application;

[0029] Figure 5 for Figure 4 Side view;

[0030] Figure 6 This is a schematic diagram of another structure of the support plate and support member in the battery cell provided in the embodiments of this application;

[0031] Figure 7 for Figure 6 Side view;

[0032] Figure 8 This is another structural schematic diagram of the support plate and support member in a battery cell provided in the embodiments of this application;

[0033] Figure 9 for Figure 8 Side view.

[0034] Reference numerals: 10-shell; 11-accommodating space; 12-side plate; 20-inner core assembly; 30-support plate; 31-first surface; 40-support member; 41-second surface; 42-guide groove; 421-groove wall; 422-groove side wall; 423-groove bottom wall; X-height direction; Y-length direction; Z-width direction. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. In the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0037] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes shown in the drawings are not necessarily essential for implementing this application and therefore should not be used to limit the scope of protection of this application.

[0038] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This illustration shows a structural diagram of the core assembly, support plate, and support member in a battery cell provided in an embodiment of this application; Figure 2 This illustration shows a structural diagram of the casing in a battery cell provided in an embodiment of this application; Figure 3This illustration shows a structural diagram of a battery cell provided in an embodiment of this application. The embodiment of this application provides a battery cell including: a housing 10, an inner core assembly 20, at least one support plate 30, and multiple support members 40. The housing 10 has a receiving space 11 and includes two side plates 12 disposed opposite each other along the height direction X. The inner core assembly 20 is disposed within the receiving space 11. The support plate 30 is disposed between the inner core assembly 20 and at least one side plate 12, and the support plate 30 has a first surface 31 facing away from the inner core assembly 20. Multiple support members 40 are disposed on the first surface 31, and each support member 40 has a second surface 41 facing away from the support plate 30. The second surface 41 has a flow-guiding groove 42 formed along the length direction Y of the battery cell. Specifically, this application utilizes the flow-guiding groove 42 formed on the second surface 41 of the support member 40 to discharge high-temperature gas generated during thermal runaway, alleviate internal pressure, prevent gas accumulation from causing safety hazards, and simultaneously improve heat dissipation performance, reducing the risk of thermal runaway. Secondly, a support plate 30 is provided between the inner core assembly 20 and the side plate 12, which can effectively support the inner core assembly 20, reduce the deformation of the inner core assembly 20 due to expansion or contraction during charging and discharging, and improve the overall structural stability of the battery cell. In addition, the combined design of the support plate 30 and the support member 40 makes full use of the housing space 11 of the casing 10, which not only ensures the support strength but also avoids unnecessary space waste, thus helping to improve the energy density of the battery.

[0039] Furthermore, the positions of the support plate 30 and the support member 40 can be interchanged. That is, multiple support members 40 are disposed on the side of the support plate 30 facing the inner core assembly 20. In this way, the exhaust channel reserved in the flow guide groove 42 can be reserved to quickly exhaust the high-temperature gas generated during thermal runaway, effectively relieve the internal pressure of the battery cell, prevent gas accumulation from causing safety hazards, and reduce the risk of thermal runaway. In addition, it should be noted that the flow guide groove 42 in this application also helps to guide the electrolyte during electrolyte injection.

[0040] Please see Figure 4 , Figure 6 and Figure 8 , Figure 4 This illustration shows a structural diagram of a support plate and support member in a battery cell provided in an embodiment of this application. Figure 6 This illustration shows another structural diagram of the support plate and support member in a battery cell provided in an embodiment of this application. Figure 8This illustration shows another structural diagram of the support plate and support member in a battery cell provided in an embodiment of this application. In some embodiments, along the length direction Y, the size of the support plate 30 is L1, the size of the support member 40 is L2, the number of support members 40 is a, and the battery cell satisfies: 0.25L1≤a×L2≤L1. Specifically, when the battery cell satisfies a×L2 within the range of 0.25L1 to L1, the support member 40 can provide good support for the battery cell, avoiding uneven force on the battery cell along the length direction Y due to unreasonable size and number of support members 40, thereby reducing the risk of deformation and damage to the battery cell and ensuring the overall performance and safety of the battery pack. It avoids the support member 40 being too small, causing space waste, and also avoids the support member 40 being too large, causing mutual interference or inability to properly cooperate with the support plate 30, affecting the compact layout of the battery pack. Thus, this application can reasonably arrange the support member 40 within a limited space, improve the integration of the battery cell, and the reasonable size and quantity configuration of the support plate makes the force and heat dissipation of the battery cell more uniform in the length direction Y, thereby improving the consistency of the battery cell performance.

[0041] Please see Figure 5 , Figure 5 It indicated Figure 4 In some embodiments, the dimension of the support plate 30 along the height direction X of the battery cell is H1, and the battery cell satisfies: 0.2mm ≤ H1 ≤ 1.0mm. Specifically, the dimension H1 of the support plate 30 can be any one or a range between any two of 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, and 1.0mm. Specifically, the dimension H1 of the support plate 30 in this application is between 0.2mm and 1.0mm, which can provide sufficient support strength while avoiding increasing the weight of the battery cell due to an excessively large size of the support plate 30, and also avoiding insufficient support force due to an excessively small size of the support plate 30, thus achieving a balance between structural strength and lightweighting, and improving the energy density and reliability of the battery cell.

[0042] Please refer to it again. Figure 5In some embodiments, the battery cell satisfies the following: 0.2mm ≤ H1 ≤ 0.8mm. Specifically, the dimension H1 of the support plate 30 can be any one or a range between any two of 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, and 0.8mm. Further, the thickness H1 of the support plate 30 is between 0.2mm and 0.8mm, which ensures sufficient support strength while avoiding increased weight of the battery cell due to excessive thickness, achieving a balance between structural strength and lightweighting, reducing the space occupied inside the casing 10, and improving the energy density of the battery cell. In addition, the moderate thickness of the support plate 30 effectively reduces the expansion or contraction deformation of the inner core assembly 20 during charging and discharging, improving the overall stability and cycle life of the battery cell.

[0043] Please refer to it again. Figure 5 In some embodiments, the dimension of the support member 40 along the height direction X is H2, and the battery cell satisfies: H2 ≤ H1. Specifically, in this application, the height H2 of the support member 40 does not exceed the height H1 of the support plate 30, ensuring that the support member 40 can be stably set on the support plate 30, avoiding imbalance of the support structure due to excessive height, thereby improving the overall structural stability of the battery cell. In addition, by limiting H2 to less than or equal to H1, the internal accommodating space 11 of the housing 10 can be reasonably utilized, avoiding the support member 40 occupying too much space, thereby improving the energy density of the battery cell. Thus, the moderate height H2 of the support member 40 can ensure the effectiveness of the flow guiding groove 42, promote the exhaust of high-temperature gas and the uniform dissipation of heat, and further improve heat dissipation performance.

[0044] Please refer to it again. Figure 5 In some embodiments, the flow-guiding groove 42 has a groove wall 421. Along the height direction X, the maximum distance between the groove wall 421 and the second surface 41 is H3, and the battery cell satisfies: 0.5H2≤H3≤H2. Thus, this application ensures that the flow-guiding groove 42 has sufficient depth to effectively discharge high-temperature gas generated during thermal runaway, while avoiding poor flow guidance due to insufficient depth. A reasonable depth of the flow-guiding groove 42 increases the cross-sectional area of ​​the gas flow channel, promoting rapid discharge of high-temperature gas and uniform heat dissipation, thereby improving the heat dissipation performance of the battery cell. Furthermore, by limiting H3 to be less than or equal to H2, it ensures that the flow-guiding groove 42 does not excessively weaken the structural strength of the support member 40, avoiding deformation or breakage of the support member 40 due to excessive depth of the flow-guiding groove 42, and improving the overall stability of the battery cell.

[0045] Please refer to it again. Figure 5In some embodiments, the battery cell satisfies: H3 = 2 / 3H2. Thus, this application ensures that the guiding groove 42 has sufficient depth while guaranteeing the smooth discharge of high-temperature gas. It avoids poor guiding effect due to an overly shallow groove 42 or weakened support plate strength due to an overly deep groove 42, providing sufficient exhaust channel cross-sectional area to promote rapid exhaust of high-temperature gas and uniform heat dissipation, thereby significantly improving the heat dissipation performance of the battery cell. While ensuring the depth of the guiding groove 42 meets the exhaust function requirements, it does not excessively weaken the structural strength of the support member 40, ensuring the stability of the support member 40 during charging and discharging, and improving the overall reliability of the battery cell.

[0046] Please see Figure 7 , Figure 7 It indicated Figure 6 In some embodiments, along the width direction Z of the battery cell, the flow-guiding groove 42 has two opposing groove sidewalls 422 and a groove bottom wall 423 connecting the two groove sidewalls 422; along the width direction Z, the groove bottom wall 423 has a dimension K2, the support plate 30 has a dimension K1, and the battery cell satisfies: 0.5K1≤K2<K1. Thus, this application can ensure that the flow-guiding groove 42 has sufficient width to effectively discharge the high-temperature gas generated during thermal runaway, avoiding poor flow guidance due to excessive width. A reasonable width K2 of the flow-guiding groove 42 can increase the cross-sectional area of ​​the exhaust channel, promoting rapid discharge of high-temperature gas and uniform heat dissipation, thereby improving the heat dissipation performance of the battery cell. Simultaneously, by limiting K2 to less than K1, it ensures that the flow-guiding groove 42 does not excessively weaken the structural strength of the support member 40, avoiding deformation or breakage of the support plate due to excessive groove width, and improving the overall stability of the battery cell. Therefore, by limiting the width of the flow-guiding groove 42, this application can effectively alleviate the high-temperature gas pressure during thermal runaway, reduce the safety risk of the battery cell, and at the same time reduce the deformation of the core component 20 and extend the life of the battery cell.

[0047] Please refer to it again. Figure 7 Preferably, in some embodiments, the battery cell satisfies: K2 = 2 / 3K1. Thus, the width of the flow-guiding groove 42 ensures the smooth discharge of high-temperature gas, significantly improving the heat dissipation performance of the battery cell. Simultaneously, it ensures that the structural strength of the support member 40 is sufficient to maintain stability during charging and discharging, improving the overall reliability of the battery cell. Furthermore, the width of the flow-guiding groove 42, while meeting the gas flow requirements, avoids occupying excessive space, optimizing the space utilization within the casing 10 and contributing to improved battery energy density.

[0048] Please refer to it again. Figure 7In some embodiments, the side plate 12 has a dimension K3 along the width direction Z, and the battery cell satisfies: 1 / 2K3≤K1≤K3. Specifically, without considering the thickness of the housing 10, the dimension of the support plate 30 along the width direction Z should be less than or equal to the dimension of the side plate 12 to ensure that the support plate 30 can be placed in the accommodating space 11 and provide support. If the thickness of the housing 10 is considered, the thickness of the housing 10 on both sides of the side plate 12 should be subtracted from the dimension of the side plate 12, generally by 0.5mm to 1mm. This ensures a stable connection between the support plate 30 and the side plate 12, avoiding insufficient support due to excessive width or excessive space occupation due to excessive width, thereby improving the overall structural stability of the battery cell, optimizing space utilization, and increasing the energy density of the battery.

[0049] Please refer to it again. Figure 5 , Figure 7 and Figure 8 Please refer to the following: Figure 9 , Figure 9 It indicated Figure 8 The side view. In some embodiments, along the length direction Y, the orthographic projection shape of the groove wall 421 of the flow guide groove 42 is any one of rectangle, trapezoid, or semicircle, or other shapes with conductive space. Specifically, flow guide grooves 42 of different shapes (such as rectangle, trapezoid, semicircle) can provide diverse gas flow channels according to actual needs, ensuring smooth exhaust of high-temperature gas, promoting rapid exhaust of high-temperature gas and uniform heat dissipation, thereby significantly improving the heat dissipation performance of the battery cell. Secondly, flow guide grooves 42 of different shapes can be optimized according to the structural characteristics of the support member 40, avoiding deformation or breakage of the support member 40 due to unreasonable groove shape, and improving the overall stability of the battery cell. In addition, selecting the shape of the flow guide groove 42 according to the actual situation of the battery cell can meet the gas flow requirements while avoiding occupying too much space, optimizing the space utilization inside the housing 10, and helping to improve the energy density of the battery.

[0050] The effects of the flow guiding groove 42 of this application will be illustrated below through specific embodiments, please refer to Table 1. In embodiments 1 to 6, different numbers and sizes of support members 40 and flow guiding grooves 42 are provided, while comparative examples 1 and 2 do not provide support members 40 and flow guiding grooves 42.

[0051] Table 1

[0052]

[0053] As shown in Table 1, after setting different numbers and sizes of support members 40 and flow guide grooves 42 in Examples 1 to 6, they can all meet the national standard requirements for thermal runaway. However, after setting no support members 40 and flow guide grooves 42 in Comparative Examples 1 and 2, they cannot meet the national standard requirements for thermal runaway.

[0054] In summary, this application enhances the structural stability of the battery cell by providing a support plate 30 between the inner core assembly 20 and the side plate 12. Furthermore, the drainage groove 42 on the support member 40 provides a pre-reserved exhaust channel, quickly discharging high-temperature gases generated during thermal runaway, effectively alleviating internal pressure in the battery cell, preventing gas accumulation that could lead to safety hazards, and reducing the risk of thermal runaway. It is understood that the structure of the support plate 30 and support member 40 also improves the internal space utilization of the battery cell, increasing energy density. Moreover, the overall structure of the support plate 30 and support member 40 is simple, highly adaptable, and suitable for various battery cell types and sizes, significantly improving the safety and overall performance of the battery cell.

[0055] Accordingly, this application also provides a battery pack, including any of the individual battery cells as described in the above embodiments. The battery pack is used to store and release electrical energy, and may further include a housing and multiple of the aforementioned battery cells, with the multiple battery cells housed within the housing. The battery pack can be a charge-discharge structure composed of multiple battery cells, such as a battery module, battery pack, battery cluster, battery stack, battery tower, or battery array. Battery cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments disclosed herein do not limit this to any particular type.

[0056] It is understood that, compared with the prior art, the battery pack provided in this application embodiment includes all the technical features and technical effects of the above-mentioned single battery cells, which will not be repeated here.

[0057] Accordingly, this application also provides an electrical device, including a battery pack as described in the above embodiments. This electrical device can be various types of equipment such as new energy vehicles, computers, and energy storage power supply devices.

[0058] It is understood that, compared with the prior art, the electrical device provided in this application embodiment includes all the technical features and technical effects of the above-mentioned battery pack, and will not be repeated here.

[0059] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0060] The battery cell provided in the embodiments of this application has been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: The housing (10) has a receiving space (11), and the housing (10) includes two side plates (12) disposed opposite to each other; Inner core assembly (20), the inner core assembly (20) being disposed within the receiving space (11); At least one support plate (30) is disposed between the inner core assembly (20) and at least one side plate (12), and the support plate (30) has a first surface (31) facing away from the inner core assembly (20); Multiple support members (40) are disposed on the first surface (31). Each support member (40) has a second surface (41) facing away from the support plate (30). The second surface (41) has a flow guide groove (42) along the length direction (Y) of the battery cell.

2. The battery cell according to claim 1, characterized in that, Along the length direction (Y), the size of the support plate (30) is L1, the size of the support member (40) is L2, the number of support members (40) is a, and the battery cell satisfies: 0.25L1≤a×L2≤L1.

3. The battery cell according to claim 1, characterized in that, Along the height direction (X) of the battery cell, the size of the support plate (30) is H1, and the battery cell satisfies: 0.2mm≤H1≤1.0mm.

4. The battery cell according to claim 3, characterized in that, The battery cell meets the following requirements: 0.2mm≤H1≤0.8mm.

5. The battery cell according to claim 3, characterized in that, Along the height direction (X), the dimension of the support member (40) is H2, and the battery cell satisfies: H2≤H1.

6. The battery cell according to claim 5, characterized in that, The flow guide groove (42) has a groove wall (421). Along the height direction (X), the maximum distance between the groove wall (421) and the second surface (41) is H3. The battery cell satisfies: 0.5H2≤H3≤H2.

7. The battery cell according to claim 6, characterized in that, The battery cell satisfies: H3 = 2 / 3H2.

8. The battery cell according to claim 1, characterized in that, Along the width direction (Z) of the battery cell, the flow guide groove (42) has two groove sidewalls (422) arranged opposite to each other, and a groove bottom wall (423) connected between the two groove sidewalls (422); Along the width direction (Z), the bottom wall (423) of the groove has a dimension K2, the support plate (30) has a dimension K1, and the battery cell satisfies: 0.5K1≤K2<K1.

9. The battery cell according to claim 8, characterized in that, The battery cell satisfies: K2 = 2 / 3K1.

10. The battery cell according to claim 8, characterized in that, Along the width direction (Z), the side plate (12) has a dimension K3, and the battery cell satisfies: 1 / 2K3≤K1≤K3.

11. The battery cell according to claim 1, characterized in that, Along the length direction (Y), the orthographic projection shape of the groove wall (421) of the flow guide groove (42) is any one of a rectangle, trapezoid, or semicircle, or other shapes with a flow space.

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