Battery cell and battery pack

Abstract

This application discloses a battery cell and a battery pack, belonging to the field of battery technology. The battery cell includes: a casing having an opening and a receiving cavity; an inner core disposed within the receiving cavity; and a side end plate covering the opening. The side end plate includes a body, with a protruding structure on one side of the body for contacting the inner core, thus forming an exhaust channel between the body and the inner core. This application, by providing a protruding structure on one side of the side end plate that directly contacts the inner core, forms an exhaust channel between the body of the side end plate and the inner core. When high-temperature gas is generated inside the battery cell, the high-temperature gas can be quickly discharged through the exhaust channel between the inner core and the side end plate, preventing the accumulation of high-temperature gas between the inner core and the end plate, reducing the resistance to high-temperature gas discharge, improving exhaust efficiency, increasing the exhaust speed of the explosion-proof valve, helping to reduce the internal pressure of the battery cell, preventing the battery cell from exploding or being damaged due to excessive pressure, and improving the safety performance of the battery cell.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery cell and a battery pack. Background Technology

[0002] In order to expel the high-temperature gases generated when a battery cell experiences thermal runaway, an exhaust channel with a connecting explosion-proof valve is usually installed between the end plate and the casing.

[0003] However, there is no venting channel between the inner core and the end plate, which affects the venting speed of the explosion-proof valve and increases the safety risk of the battery cell. Utility Model Content

[0004] Purpose of this application: This application provides a battery cell to solve the problem that the lack of an exhaust channel between the inner core and the end plate affects the exhaust speed of the explosion-proof valve; this application also provides a battery cell.

[0005] This application provides a single battery cell, comprising:

[0006] The shell has an opening and a receiving cavity;

[0007] The inner core is disposed within the receiving cavity;

[0008] A side end plate covers the opening; the side end plate includes a body, and a protruding structure is provided on one side of the body. The protruding structure is used to contact the inner core, so that an exhaust channel can be formed between the body and the inner core.

[0009] In some embodiments, the body has a through hole, and an explosion-proof valve is disposed in the through hole;

[0010] The side end plate is provided with at least two sets of the protrusion structure, and each side of the through hole is provided with at least one set of the protrusion structure, with each set of the protrusion structure having at least two protrusion structures.

[0011] In some embodiments, each group of protrusion structures includes a first protrusion, a second protrusion, and a third protrusion, wherein the first protrusion and the second protrusion are arranged along the width direction of the battery cell, the third protrusion is disposed along the height direction of the battery cell between the first protrusion, the second protrusion, and the through hole, and the third protrusion is located between the first protrusion and the second protrusion along the width direction.

[0012] In some embodiments, a plurality of the protrusion structures are included, and the plurality of protrusion structures are spaced apart on the body.

[0013] In some embodiments, the body has a through hole, an explosion-proof valve is disposed in the through hole, and a plurality of the protruding structures are disposed on both sides of the through hole.

[0014] In some embodiments, the projections of the plurality of protrusions at least partially overlap along the width direction of the battery cell.

[0015] In some embodiments, the projections of the plurality of protrusions at least partially overlap along the height direction of the battery cell.

[0016] In some embodiments, the cross-section of the protrusion structure is circular, elliptical, or rectangular.

[0017] In some embodiments, the protrusion structure has a protrusion height H, satisfying: 0.5mm≤H≤10mm.

[0018] In some embodiments, there is a gap D between two adjacent protrusions, satisfying that D > 0 mm.

[0019] Accordingly, this application also provides a battery pack, including:

[0020] Liquid cooling plate;

[0021] Multiple battery cells as described above, wherein the housing of the battery cell is in contact with the liquid cooling plate, and the side end plate of the battery cell is arranged perpendicular to the liquid cooling plate.

[0022] Beneficial Effects: Compared with the prior art, the battery cell provided in this application includes: a casing having an opening and a receiving cavity; an inner core disposed within the receiving cavity; and a side end plate covering the opening. The side end plate includes a body, and a protruding structure is provided on one side of the body. The protruding structure is used to contact the inner core, so that an exhaust channel can be formed between the body and the inner core. Thus, this application provides a protruding structure on one side of the side end plate that directly contacts the inner core, thereby forming an exhaust channel between the body of the side end plate and the inner core. When high-temperature gas is generated inside the battery cell due to abnormal conditions such as overheating or overcharging, the high-temperature gas can be quickly discharged through the exhaust channel between the inner core and the side end plate, preventing the high-temperature gas from accumulating between the inner core and the side end plate. This reduces the resistance to the discharge of high-temperature gas, improves exhaust efficiency, significantly increases the exhaust speed of the explosion-proof valve, helps reduce the internal pressure of the battery cell, prevents the battery cell from exploding or being damaged due to excessive pressure, and improves the safety performance of the battery cell.

[0023] 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 battery cells, which will not be repeated here. 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 a side end plate in a battery cell provided in an embodiment of this application;

[0026] Figure 2 A side view of the end plate in a battery cell provided in an embodiment of this application;

[0027] Figure 3 for Figure 2 A magnified view of a portion of region A in the middle;

[0028] Figure 4 This is a schematic diagram of another structure of the side end plate in a battery cell provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0030] Figure 6 This is another structural schematic diagram of the side end plate in a battery cell provided in the embodiments of this application;

[0031] Figure 7 This is a schematic diagram of another structure of the side plate in a battery cell provided in an embodiment of this application.

[0032] Reference numerals: 10-side end plate; 11-body; 12-through hole; 13-protruding structure; 131-first protrusion; 132-second protrusion; 133-third protrusion; 20-shell; 21-receiving cavity; 30-inner core; 40-explosion-proof valve; 50-exhaust channel; X-width direction; Y-height direction; Z-length direction. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Currently, there is no venting channel between the core and the end plate in the battery cell, which affects the venting speed of the explosion-proof valve and increases the safety risk of the battery cell.

[0037] In view of this, this application provides a battery cell by providing a protruding structure 13 on one side of the body 11 of the side end plate 10 that directly contacts the inner core 30, so that an exhaust channel 50 is formed between the body 11 of the side end plate 10 and the inner core 30, thereby solving at least part of the above-mentioned technical problems.

[0038] Please see Figure 1 and Figure 5 , Figure 1 This illustration shows a structural diagram of a side end plate in a battery cell provided in an embodiment of this application; Figure 5This application provides a schematic diagram of the structure of a battery cell according to an embodiment of the present application. The present application provides a battery cell including: a housing 20, an inner core 30, and a side end plate 10; wherein the housing 20 has an opening and a receiving cavity 21; the inner core 30 is disposed within the receiving cavity 21; the side end plate 10 covers the opening; the side end plate 10 includes a body 11, and a protruding structure 13 is provided on one side of the body 11, the protruding structure 13 being used to contact the inner core 30, so that an exhaust channel 50 can be formed between the body 11 and the inner core 30. Thus, by providing a protruding structure 13 on the body 11 of the side end plate 10, and the protruding structure 13 being in direct contact with the inner core 30, the present application achieves an exhaust channel 50 between the body 11 and the inner core 30. When high-temperature gas is generated inside the battery cell due to abnormal conditions such as overheating or overcharging, the high-temperature gas can be quickly discharged through the exhaust channel 50 between the inner core 30 and the side end plate 10, avoiding the accumulation of high-temperature gas between the inner core 30 and the side end plate 10. This reduces the resistance to the discharge of high-temperature gas, improves the exhaust efficiency, significantly increases the exhaust speed of the explosion-proof valve 40, helps to reduce the internal pressure of the battery cell, prevents the battery cell from exploding or being damaged due to excessive pressure, and improves the safety performance of the battery cell.

[0039] It should be noted that you should refer to this again. Figure 5 In this application, the inner core 30 is placed sideways, meaning its height direction Y is perpendicular to the placement plane. Furthermore, the casing 20 is also similarly placed sideways on the liquid cooling plate and in contact with it. The side end plate 10 is perpendicular to the liquid cooling plate, allowing the heat from the battery cell to dissipate quickly through the liquid cooling plate. Additionally, along the length direction Z, the casing 20 has an opening on one side for the side end plate 10 and an opening on the other side for a side plate. The side end plate 10 has a protruding structure 13 and a pressure relief structure (i.e., a through hole 12 and an explosion-proof valve 40). A terminal post is provided on the side plate, such that the explosion-proof valve 40 and the terminal post are located on both sides of the battery cell 30. Thus, when the battery cell needs pressure relief, high-temperature gas reaches the explosion-proof valve 40 through the exhaust channel 50 and is discharged in a directional manner. The pressure relief direction is completely separated from the side plate where the terminal post is located, preventing high-pressure gas from directly impacting the terminal post or electrolyte from splashing onto the electrical connection, thus preventing short circuits or corrosion risks. Meanwhile, this application uses the raised structure 13 to form the exhaust channel 50 without additional complex structures, which improves the thermal management efficiency of the battery cell and avoids performance degradation or safety hazards caused by excessive temperature. This ensures the compactness of the battery cell and improves its reliability and safety.

[0040] In some embodiments, the body 11 has a through hole 12, and an explosion-proof valve 40 is disposed in the through hole 12; the side end plate 10 is provided with at least two sets of protruding structures 13, with at least one set of protruding structures 13 on each side of the through hole 12, and the number of protruding structures 13 in each set is at least two. Specifically, by providing an explosion-proof valve 40 in the through hole 12, and combining it with the exhaust channel 50 formed by multiple sets of protruding structures 13, this application can quickly guide the high-temperature gas generated inside the battery cell to the explosion-proof valve 40, significantly improving exhaust efficiency. Secondly, the multiple sets of protruding structures 13 increase the number of exhaust channels 50 and make their distribution more uniform, ensuring that high-temperature gas can be quickly discharged from multiple directions, avoiding the accumulation of high-temperature gas, reducing the internal pressure of the battery cell, and preventing the battery cell from exploding or being damaged. At the same time, the provision of at least one set of protruding structures 13 on each side of the through hole 12, and the number of protruding structures 13 in each set being at least two, thereby balancing the flow of high-temperature gas through symmetrical distribution, further reducing exhaust resistance, and further improving the safety and reliability of the battery. Furthermore, it can be understood that the multiple sets of protruding structures 13 not only form the exhaust channel 50, but also enhance the contact stability between the side end plate 10 and the inner core 30, avoid displacement or loosening caused by vibration or impact, balance the force on the side end plate 10, and improve the strength and durability of the overall structure of the battery cell.

[0041] Please see Figure 4 , Figure 4This illustration shows another structural diagram of the side end plate in a battery cell provided in an embodiment of this application. In some embodiments, each set of protrusion structures 13 includes a first protrusion 131, a second protrusion 132, and a third protrusion 133. The first protrusion 131 and the second protrusion 132 are arranged along the width direction X of the battery cell, and the third protrusion 133 is arranged along the height direction Y of the battery cell between the first protrusion 131, the second protrusion 132, and the through hole 12. The third protrusion 133 is located between the first protrusion 131 and the second protrusion 132 along the width direction X, and the third protrusion 133 is arranged along the height direction Y and located between the first protrusion 131 and the second protrusion 132 in the width direction, forming a multi-directional exhaust channel 50. This can more evenly distribute the flow path of high-temperature gas, allowing high-temperature gas to flow quickly from multiple directions to the through hole 12 and the explosion-proof valve 40, further reducing exhaust resistance, significantly improving exhaust efficiency, and preventing the accumulation of high-temperature gas. Secondly, the third protrusion 133 is located between the first protrusion 131 and the second protrusion 132, and is close to the through hole 12. It can effectively guide the high-temperature gas to flow into the through hole 12, further improving the response speed and exhaust effect of the explosion-proof valve 40, ensuring that the high-temperature gas will not disperse or stagnate during the exhaust process, thereby improving the safety and reliability of the battery. At the same time, the distribution design of the first protrusion 131, the second protrusion 132 and the third protrusion 133 increases the contact area between the side end plate 10 and the inner core 30, evenly dispersing the pressure and vibration inside the battery cell, and enhancing the stability of the battery cell.

[0042] In some embodiments, a plurality of protruding structures 13 are included, which are spaced apart on the body 11. Specifically, by spaced apart, the present application can form a plurality of uniformly distributed exhaust channels 50 between the inner core 30 and the side end plate 10, thereby ensuring that high-temperature gas can flow quickly and uniformly from different areas to the explosion-proof valve 40, avoiding the accumulation of high-temperature gas in local areas and improving exhaust efficiency. This further reduces the resistance to the flow of high-temperature gas, allowing it to be discharged more quickly, significantly improving the response speed and exhaust effect of the explosion-proof valve 40, reducing the internal pressure of the battery cell, and preventing the battery cell from exploding or being damaged due to excessive pressure, thereby improving the safety of the battery cell. Similarly, the spaced apart arrangement of the plurality of protruding structures 13 increases the contact points between the side end plate 10 and the inner core 30, improving the stability and overall strength of the structure.

[0043] In some embodiments, the body 11 has a through hole 12, in which an explosion-proof valve 40 is disposed, and multiple protruding structures 13 are disposed on both sides of the through hole 12. Specifically, by disposing of multiple protruding structures 13 on both sides of the through hole 12, multiple exhaust channels 50 can be formed between the inner core 30 and the side end plate 10, allowing high-temperature gas to flow quickly and evenly from multiple directions on both sides of the through hole 12 to the explosion-proof valve 40, reducing exhaust resistance and significantly improving exhaust efficiency.

[0044] Please see Figure 6 , Figure 6 This illustration shows another structural diagram of the side end plate in a battery cell provided in this application embodiment. In some embodiments, the projections of multiple protruding structures 13 at least partially overlap along the width direction X of the battery cell. Specifically, the projections of multiple protruding structures 13 at least partially overlap in the width direction X of the battery cell, which can form a more complex and efficient network of exhaust channels 50 between the inner core 30 and the side end plate 10. This allows high-temperature gas to flow quickly and evenly to the through hole 12 and the explosion-proof valve 40 through the overlapping area, reducing exhaust resistance and significantly improving exhaust efficiency. In addition, the overlapping area of ​​the projections of the protruding structures 13 can act as a guide for high-temperature gas, concentrating and guiding the high-temperature gas to the through hole 12 and the explosion-proof valve 40, preventing the high-temperature gas from dispersing or stagnating, ensuring that the high-temperature gas can be discharged more quickly, improving the response speed of the explosion-proof valve 40 and the safety of the battery.

[0045] Please see Figure 7 , Figure 7 This illustration shows another structural diagram of the side end plate in a battery cell provided in this application embodiment. In some embodiments, the projections of multiple protruding structures 13 at least partially overlap along the height direction Y of the battery cell. Similarly, the at least partial overlap of the projections of multiple protruding structures 13 in the height direction Y can form a more complex and efficient network of exhaust channels 50 between the inner core 30 and the side end plate 10, allowing high-temperature gas to flow quickly and evenly to the through hole 12 and the explosion-proof valve 40 through the overlapping area, reducing exhaust resistance and significantly improving exhaust efficiency. Furthermore, the overlapping projection area of ​​the protruding structures 13 can act as a high-temperature gas guide, concentrating and guiding the high-temperature gas to the through hole 12 and the explosion-proof valve 40, preventing the high-temperature gas from dispersing or stagnating, ensuring that the high-temperature gas can be discharged more quickly, improving the response speed of the explosion-proof valve 40 and the safety of the battery.

[0046] In some embodiments, the cross-section of the protrusion structure 13 is circular, elliptical, or rectangular. Specifically, a circular cross-section protrusion structure 13 can evenly distribute the pressure when in contact with the inner core 30, reducing stress concentration and improving structural durability. Simultaneously, the streamlined circular design facilitates smooth flow of high-temperature gas, reducing exhaust resistance and improving exhaust efficiency. In contrast, an elliptical cross-section protrusion structure 13 can provide a larger contact area in a specific direction while maintaining a smaller footprint, adapting to the space constraints within the battery cell and enhancing the stability between the side end plate 10 and the inner core 30. A rectangular cross-section protrusion structure 13 can provide a larger contact area, enhancing the connection strength and stability between the side end plate 10 and the inner core 30. Thus, this application can select the most suitable cross-section of the protrusion structure 13 according to the specific needs of the battery cell to optimize exhaust performance, structural strength, and manufacturing process. Of course, regardless of the cross-sectional shape, the design of the protrusion structure 13 can effectively form an exhaust channel 50, improving exhaust efficiency, reducing internal pressure within the battery cell, and enhancing safety.

[0047] Please refer to the following: Figure 2 and Figure 3 , Figure 2 The illustration shows a side view of the end plate in a battery cell provided in an embodiment of this application; Figure 3 It indicated Figure 2 A partially enlarged schematic diagram of region A; in some embodiments, the protrusion structure 13 has a protrusion height H, satisfying: 0.5mm ≤ H ≤ 10mm. Specifically, the protrusion height H mm can be any one or any two of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm, to balance exhaust efficiency and space utilization. Thus, the protrusion height H mm of the protrusion structure 13, between 0.5mm and 10mm, can form a sufficiently large exhaust channel 50 between the inner core 30 and the side end plate 10, ensuring that high-temperature gas flows quickly and smoothly to the through hole 12 and the explosion-proof valve 40. At the same time, it avoids the protrusion height H being too large, which may occupy too much space and affect the compactness of the battery cell. Furthermore, it ensures sufficient contact area between the protruding structure 13 and the inner core 30, enhancing the connection strength and stability between the side end plate 10 and the inner core 30; it also better disperses internal pressure and vibration of the battery cell, reduces relative displacement between the side end plate 10 and the inner core 30, and improves the durability of the battery cell. The most suitable protrusion height H can also be selected according to the specific requirements of the battery cell (such as energy density, size limitations, etc.), flexibly adapting to the design requirements of different battery cells.

[0048] Please refer to them again. Figure 4 , Figure 6 and Figure 7 In some embodiments, there is a gap D between two adjacent protrusions 13, satisfying that D > 0 mm. Specifically, in this application embodiment, by setting the gap D between adjacent protrusions 13 to be greater than 0 mm, and of course, the gap D is set differently depending on the setting direction of the two adjacent protrusions 13, it can ensure that a clear exhaust channel 50 is formed between the inner core 30 and the side end plate 10, ensuring that high-temperature gas can flow quickly and smoothly to the through hole 12 and the explosion-proof valve 40, preventing high-temperature gas from accumulating in local areas, improving exhaust efficiency, and reducing the internal pressure of the battery cell.

[0049] In summary, this application provides a protruding structure 13 on one side of the body 11 of the side end plate 10 that directly contacts the inner core 30, thereby forming an exhaust channel 50 between the body 11 of the side end plate 10 and the inner core 30. When high-temperature gas is generated inside the battery cell due to abnormal conditions such as overheating or overcharging, the high-temperature gas can be quickly discharged through the exhaust channel 50 between the inner core 30 and the side end plate 10, preventing the high-temperature gas from accumulating between the inner core 30 and the side end plate 10. This reduces the resistance to the discharge of high-temperature gas, improves the exhaust efficiency, significantly increases the exhaust speed of the explosion-proof valve 40, helps to reduce the internal pressure of the battery cell, prevents the battery cell from exploding or being damaged due to excessive pressure, and improves the safety performance of the battery cell.

[0050] Accordingly, this application also provides a battery pack, including: a liquid cooling plate; a plurality of battery cells as described above, wherein the housing 20 of the battery cells is in contact with the liquid cooling plate, and the side end plate 10 of the battery cells is disposed perpendicular to the liquid cooling plate. The battery pack is used to store and release electrical energy, and may also include a housing and a plurality of the aforementioned battery cells, wherein the plurality of battery cells are housed in the housing. The battery pack may be a charging and discharging structure composed of a plurality of 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The battery cell and battery pack provided in the embodiments of this application have 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 shell has an opening and a receiving cavity; The inner core is disposed within the receiving cavity; A side end plate covers the opening; the side end plate includes a body, and a protruding structure is provided on one side of the body. The protruding structure is used to contact the inner core, so that an exhaust channel can be formed between the body and the inner core.

2. The battery cell according to claim 1, characterized in that, The main body has a through hole, and an explosion-proof valve is installed in the through hole; The side end plate is provided with at least two sets of the protrusion structure, and each side of the through hole is provided with at least one set of the protrusion structure, with each set of the protrusion structure having at least two protrusion structures.

3. The battery cell according to claim 2, characterized in that, Each set of protrusion structures includes a first protrusion, a second protrusion, and a third protrusion. The first protrusion and the second protrusion are arranged along the width direction of the battery cell, and the third protrusion is disposed between the first protrusion, the second protrusion, and the through hole along the height direction of the battery cell. The third protrusion is located between the first protrusion and the second protrusion along the width direction.

4. The battery cell according to claim 1, characterized in that, It includes a plurality of the aforementioned protrusions, which are spaced apart on the body.

5. The battery cell according to claim 4, characterized in that, The main body has a through hole, an explosion-proof valve is installed in the through hole, and multiple protruding structures are arranged on both sides of the through hole.

6. The battery cell according to claim 4, characterized in that, Along the width direction of the battery cell, the projections of the plurality of protrusions at least partially overlap.

7. The battery cell according to claim 4, characterized in that, Along the height direction of the battery cell, the projections of the plurality of protrusions at least partially overlap.

8. The battery cell according to any one of claims 1 to 7, characterized in that, The cross-section of the protruding structure is circular, elliptical, or rectangular.

9. The battery cell according to any one of claims 1 to 7, characterized in that, The protruding structure has a protrusion height H, which satisfies: 0.5mm≤H≤10mm.

10. The battery cell according to any one of claims 2 to 7, characterized in that, There is a gap D between two adjacent protrusions, satisfying that D > 0 mm.

11. A battery pack, characterized in that, include: Liquid cooling plate; Multiple battery cells as described in any one of claims 1 to 10, wherein the housing of the battery cell is in contact with the liquid cooling plate, and the side end plate of the battery cell is disposed perpendicular to the liquid cooling plate.

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