Battery cell, battery pack and battery system

Abstract

The embodiment of the utility model discloses a battery cell, a battery pack and a battery system, and relates to the technical field of energy storage devices.The first end face and the second end face of a battery cell body of the battery cell are provided with a first clamping structure and a second clamping structure respectively, and the first end face and the second end face are oppositely arranged; the first clamping structure is used for being clamped and matched with the second clamping structure of another adjacent battery cell; according to the technical scheme provided by the embodiment of the invention, the clamping structures increase the heat dissipation area of the battery cells, so that the heat dissipation efficiency of the battery is improved, in addition, the clamping structures also facilitate the clamping matching of the two adjacent battery cells, and the assembly stability of the battery system formed by the plurality of battery cells is ensured while the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The embodiments in this application relate to the field of energy storage device technology, and in particular to a battery cell, battery pack, and battery system. Background Technology

[0002] Power batteries are mainly divided into two types: square batteries and cylindrical batteries. Square batteries are suitable for a variety of applications due to their rectangular shape and flexible size design, while cylindrical batteries are widely used in electric vehicles and portable electronic devices due to their standardized size and high energy density.

[0003] For square power batteries, the battery casing is typically formed by laser welding three parts: a outer shell, a first cover plate, and a second cover plate. The cavity formed by these three parts is used to install the separator and hold the electrolyte. The outer shell, which is also the side wall of the power battery, has a large surface area, and most of the heat generated by the battery during operation is dissipated through the outer shell.

[0004] When multiple cells are arranged and combined to form a battery pack, the close contact between adjacent cells will significantly reduce the overall heat dissipation effect of the battery. Utility Model Content

[0005] Several embodiments in this application propose a casing, a cell, and a battery system aimed at improving the overall heat dissipation efficiency of the battery.

[0006] One embodiment of this application provides a battery cell including a battery cell body. The first end face and the second end face of the battery cell body are respectively provided with a first snap-fit ​​structure and a second snap-fit ​​structure. The first end face and the second end face are disposed opposite to each other. The first snap-fit ​​structure is used to snap-fit ​​with the second snap-fit ​​structure of another adjacent battery cell.

[0007] In one embodiment, the first snap-fit ​​structure has a first snap-fit ​​groove, and the second snap-fit ​​structure has a second snap-fit ​​groove, wherein a portion of the first snap-fit ​​structure and a portion of the second snap-fit ​​structure are respectively snapped into the second snap-fit ​​groove and the first snap-fit ​​groove.

[0008] In one embodiment, the first snap-fit ​​structure includes a plurality of first snap-fit ​​members, which are spaced apart along the height direction of the battery cell; and

[0009] The second snap-fit ​​structure includes a plurality of second snap-fit ​​components, which are spaced apart along the height direction of the battery cell, and each first snap-fit ​​component engages with a second snap-fit ​​component of another battery cell.

[0010] In one embodiment, a plurality of first snap-fit ​​connectors and a plurality of second snap-fit ​​connectors are staggered relative to each other.

[0011] In one embodiment, the first latching member includes a first latching portion and a second latching portion connected to each other, the first latching portion and the second latching portion being disposed at an angle, and the first latching portion, the second latching portion, and the battery cell body forming the first latching groove; and

[0012] The second latching member includes a third latching part and a fourth latching part connected to each other. The third latching part and the fourth latching part are arranged at an angle. The third latching part, the fourth latching part, and the battery cell body together form the second latching groove.

[0013] In one embodiment, the first snap-fit ​​component, the second snap-fit ​​component, and the battery cell body are integrally formed.

[0014] In one embodiment, each of the first snap-fit ​​components and the battery cell body, and each of the second snap-fit ​​components and the battery cell body respectively form a heat dissipation duct.

[0015] In one embodiment, the plurality of heat dissipation ducts are all arranged to extend along a first direction.

[0016] An embodiment of this application also proposes a battery pack comprising a plurality of cells as described above, each of the cells being engaged with a second snap-fit ​​structure of another adjacent cell via a first snap-fit ​​structure.

[0017] One embodiment of this application also proposes a battery system comprising the cells described above.

[0018] In the various embodiments provided in this application, snap-fit ​​structures are respectively provided on the two opposite sidewalls of the cell body, thereby increasing the heat dissipation area of ​​the cell and improving heat dissipation efficiency, keeping the cell within a suitable operating range. Specifically, the cell body has a first end face and a second end face, which are arranged opposite to each other and respectively provided with a first snap-fit ​​structure and a second snap-fit ​​structure. The snap-fit ​​structures protrude from the outer surface of the cell body, thereby providing additional heat dissipation area. The heat generated by the cell during operation is conducted through the first snap-fit ​​structure and the second snap-fit ​​structure, thereby exchanging heat with the outside air. In addition, when multiple cells are packaged to form a battery pack, the first snap-fit ​​structure of one cell can also snap-fit ​​with the second snap-fit ​​structure of another adjacent cell, improving heat dissipation efficiency while ensuring the assembly stability when multiple cells constitute a battery system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments or prior art of this application, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the battery cell housing provided in this application;

[0021] Figure 2 A schematic diagram of the structure of the first embodiment of the battery cell provided in this application;

[0022] Figure 3 for Figure 2 A structural diagram of the battery cell from another angle;

[0023] Figure 4 for Figure 2 A schematic diagram of a battery system composed of multiple battery cells;

[0024] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0025] Figure 6 A schematic diagram of the structure of the second embodiment of the battery cell provided in this application;

[0026] Figure 7 for Figure 6 A structural diagram of the battery cell from another angle;

[0027] Figure 8 for Figure 6 A schematic diagram of a battery system composed of multiple battery cells;

[0028] Figure 9 for Figure 8 A magnified view of a section at point B in the middle;

[0029] Figure 10 A schematic diagram of the structure of the third embodiment of the battery cell provided in this application;

[0030] Figure 11 This is a schematic diagram of an embodiment of the battery system proposed in this application.

[0031] Explanation of icon numbers:

[0032] 100. Battery cell; 1. Housing; 1a. Receiving cavity; 11. First snap-fit ​​structure; 111. First snap-fit ​​portion; 112. Second snap-fit ​​portion; 113. First extension portion; 11a. First snap-fit ​​groove; 12. Second snap-fit ​​structure; 121. Third snap-fit ​​portion; 122. Fourth snap-fit ​​portion; 123. Second extension portion; 124. Heat dissipation duct; 12a. Second snap-fit ​​groove; 13. End face; 131. First end face; 132. Second end face. Detailed Implementation

[0033] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of several embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0034] It should be noted that if directional indications (such as up, down, left, right, front, back, etc.) are involved in multiple embodiments of this application, the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] Furthermore, if multiple embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0036] For prismatic power batteries, the battery casing is typically formed by laser welding three parts: a outer shell, a first cover plate, and a second cover plate. The cavity formed by these three parts is used to install the separator and hold the electrolyte. The outer shell, which is also the sidewall of the power battery, has a large surface area, and most of the heat generated by the battery during operation is dissipated through the outer shell. When multiple cells are arranged to form a battery pack, the close contact between adjacent cells leads to a significant decrease in the overall heat dissipation effect of the battery.

[0037] To address the aforementioned issues, this application proposes a battery cell 100, which includes a battery cell body. The first end face 131 and the second end face 132 of the battery cell body are respectively provided with a first snap-fit ​​structure 11 and a second snap-fit ​​structure 12. The first end face 131 and the second end face 132 are arranged opposite to each other. The first snap-fit ​​structure 11 is used to snap-fit ​​with the second snap-fit ​​structure 12 of another adjacent battery cell 100.

[0038] For details, please refer to the accompanying drawings in the instruction manual. Figures 1 to 11 The battery cell proposed in this application is a prismatic cell, which has a rectangular or square external structure. This type of battery typically consists of multiple cells, each including components such as a positive electrode, a negative electrode, and a separator, all encapsulated within a square casing. The prismatic battery design provides high space utilization and good heat dissipation, making it suitable for various electronic devices, electric vehicles, energy storage systems, and other fields. Due to its standardized and modular structure, prismatic batteries are easy to mass-produce and integrate, and also offer advantages in terms of safety, stability, and energy density.

[0039] It should be noted that the battery cell 100 with the snap-fit ​​structure can have one or more snap-fit ​​structures, and this application does not limit this. In one embodiment of this application, one end face 13 is provided with multiple snap-fit ​​structures, which can significantly improve the heat dissipation performance of the battery. The snap-fit ​​structure increases the heat dissipation area and promotes airflow, thereby accelerating the conduction and dissipation of heat. This design helps to reduce the heat generated by the battery during charging and discharging, keeping the battery's operating temperature within a reasonable range, thereby improving the battery's performance and lifespan.

[0040] In the various embodiments provided in this application, a snap-fit ​​structure is provided in the housing 1 to increase the heat dissipation area of ​​the battery cell 100, thereby improving heat dissipation efficiency and keeping the battery cell within a suitable operating range. Specifically, the housing 1 is a square structure formed by multiple end faces 13, which together form a receiving cavity 1a with openings at both ends. A snap-fit ​​structure is provided on at least one end face 13, protruding from the surface of the housing 1, thereby providing additional heat dissipation area. The heat generated by the battery cell during operation is conducted to the end face 13 and the snap-fit ​​structure, thereby exchanging heat with the outside air. Furthermore, when multiple battery cells 100 are packaged to form a battery pack, the first snap-fit ​​structure 11 of one battery cell 100 can also snap-fit ​​with the second snap-fit ​​structure 12 of another adjacent battery cell 100, improving heat dissipation efficiency while ensuring the assembly stability when multiple battery cells constitute a battery system. The snap-fit ​​structure includes a first snap-fit ​​structure 11 and a second snap-fit ​​structure 12 respectively disposed on the first end face 131 and the second end face 132. Through the snap-fit ​​cooperation of the first snap-fit ​​structure 11 and the second snap-fit ​​structure 12, adjacent battery cells 100 can be fixed, thereby improving their structural stability.

[0041] It is understood that the battery cell casing 1 proposed in this application is a one-piece structure, typically manufactured using a stretch forming process. This process involves placing a metal sheet (such as aluminum alloy) into a stretching die and stretching it under pressure into the desired tetrahedral structure, forming the casing 1 with openings at both ends. This manufacturing method can effectively control the dimensional accuracy and wall thickness uniformity of the casing, while improving production efficiency and material utilization. The stretched casing 1 has good strength and rigidity, providing stable support and protection for the battery. Furthermore, to improve the overall structural strength of the casing 1, the snap-fit ​​structure on the end face 13 is integrally formed with the end face 13. This design significantly improves heat dissipation performance and structural stability because there is no seam between the snap-fit ​​structure and the substrate, resulting in higher heat conduction efficiency. Secondly, the integrally formed snap-fit ​​structure is more stable, reducing the risk of loosening or detachment, and improving product reliability and durability. This manufacturing process can also save on mold costs, simplify the production process, and improve production efficiency.

[0042] It should be noted that the multiple snap-fit ​​structures can be arranged with uniform or non-uniform spacing. This application does not limit the placement of the snap-fit ​​structures. In one embodiment of this application, multiple snap-fit ​​structures are arranged with uniform spacing and extend along a preset extension line. This arrangement optimizes heat dissipation performance and airflow. The uniformly spaced snap-fit ​​structures ensure more uniform airflow between them, reducing localized overheating. Simultaneously, this design helps improve heat dissipation efficiency, as each snap-fit ​​structure effectively participates in heat conduction and dissipation. Furthermore, the uniform snap-fit ​​structure layout reduces airflow resistance, improving the overall heat dissipation effect.

[0043] In the first embodiment of this application, the snap-fit ​​slots of each snap-fit ​​structure located on the same side are all oriented towards the same side. This ensures better flexibility when assembling multiple battery cells 100, allowing the snap-fit ​​slots of the snap-fit ​​structures to align and fit better during battery cell 100 assembly, eliminating the need for installation in a specific direction. Simultaneously, this consistency also helps simplify the assembly process and reduce assembly errors. The first snap-fit ​​structure 11 includes a first snap-fit ​​portion 111 and a second snap-fit ​​portion 112. For details, please refer to further description. Figure 1 and Figure 5The first latching portion 111 is disposed on the first end face 131 and extends toward the end away from the first end face 131, while the second latching portion 112 is disposed at one end of the second end face 132. It should be noted that the first latching portion 111 and the second latching portion 112 can be an integral structure or a separate structure. This application does not limit this. In one embodiment of this application, the first latching portion 111 and the second latching portion 112 are integrally formed structures, and the second latching portion 112 and the first latching portion 111 are both integrally formed structures, so as to ensure that the three have better connection strength.

[0044] Furthermore, the second snap-fit ​​structure 12 is similar in structure to the first snap-fit ​​structure 11, except that the opening orientations of the first snap-fit ​​groove 11a and the second snap-fit ​​groove 12a are different. Therefore, taking the first snap-fit ​​structure 11 as an example, the second snap-fit ​​part 112 and the first snap-fit ​​part 111 have a certain included angle, so that the first snap-fit ​​part 111, the second snap-fit ​​part 112 and the end face 13 together form a snap-fit ​​groove. The included angle can be an acute angle, an obtuse angle, or the second snap-fit ​​part 112 and the first snap-fit ​​part 111 can be arranged perpendicularly. This application does not limit this. In one embodiment of this application, the second snap-fit ​​part 112 and the first snap-fit ​​part 111 are arranged perpendicularly. The perpendicular second snap-fit ​​part 112 and the first snap-fit ​​part 111 can significantly enhance the structural stability of the snap-fit ​​structure, making it less prone to deformation or damage when subjected to pressure and vibration during the assembly of the battery cell 100, thereby ensuring the tight fit and long-term stability between the snap-fit ​​structure and the battery cell 100. Secondly, this design improves heat dissipation efficiency because the vertical snap-fit ​​structure can more effectively guide airflow and promote rapid heat dissipation. The vertically arranged second snap-fit ​​part 112 and first snap-fit ​​part 111 also facilitate the installation between the battery cells 100.

[0045] In this first embodiment, both opposite end faces 13 of the housing 1 are provided with snap-fit ​​structures, and each end face 13 is provided with multiple snap-fit ​​structures. It should be noted that the openings of the multiple snap-fit ​​structures located on two different end faces 13 can face the same side or be arranged opposite to each other. This application does not limit this. In one embodiment of this application, the openings of multiple snap-fit ​​grooves on one end face 13 are all opposite to the openings of multiple snap-fit ​​grooves on the other end face 13. For details, please refer to further reading. Figure 3 and Figure 4 This arrangement ensures a certain regularity in the snap-fit ​​assembly of adjacent cells 100, allowing any cell 100 to be randomly assembled with any other cell 100, thus improving assembly flexibility and simplifying the battery system assembly process. To further facilitate the assembly between cells 100, multiple first snap-fit ​​portions 111 located on one end face 13 are staggered with multiple first snap-fit ​​portions 111 located on the other end face 13. For details, please refer to further details. Figure 4 By staggering the first latching portion 111 and the third latching portion 121 respectively located on the first end face 131 and the second end face 132, it can be ensured that when the two battery cells 100 are assembled and latched, each second latching portion 112 can be accommodated in the latching groove on the other battery cell 100. The latching structure and the latching groove adopt a clearance fit, which makes the assembly and disassembly of the battery cells 100 simpler. Furthermore, hot melt adhesive can be injected at the contact position between the latching structure and the latching groove to ensure a more reliable connection between the battery cells 100. The presence of hot melt adhesive can also further increase the heat dissipation area of ​​the housing 1, thereby improving heat dissipation efficiency.

[0046] In the second embodiment of this application, the snap-fit ​​structure includes a first snap-fit ​​portion 111, a second snap-fit ​​portion 112, and a first extension portion 113 connected end to end in sequence, and the first snap-fit ​​portion 111, the second snap-fit ​​portion 112, and the first extension portion 113 together form a U-shaped structure. One end of the first snap-fit ​​portion 111 and the first extension portion 113 is connected to the end face 13. For details, please refer to further description. Figures 6 to 9 In this embodiment, the snap-fit ​​groove is located in the gap between the two snap-fit ​​structures, and the snap-fit ​​structures located on two different end faces 13 are still staggered, so that each snap-fit ​​structure can snap-fit ​​and limit the movement with a snap-fit ​​groove. The width of the snap-fit ​​groove is slightly larger than the width of the snap-fit ​​structure, so that the snap-fit ​​structure can have a certain force with the snap-fit ​​groove, thereby ensuring that the fit between each battery cell 100 has good stability.

[0047] Furthermore, to optimize heat dissipation, in this second embodiment, each snap-fit ​​structure has a heat dissipation duct 124. For details, please refer to further documentation. Figure 9 The heat dissipation duct 124 is formed by the end face 13, the first snap-fit ​​portion 111, the second snap-fit ​​portion 112, and the first extension portion 113. The heat dissipation duct 124 is closely attached to the end face 13 and can effectively dissipate the heat generated by the battery body during operation. It should be noted that the heat dissipation duct 124 can extend along the height direction of the battery or along the width direction of the battery. This application does not limit this. In one embodiment of this application, the heat dissipation duct 124 extends from one opening of the housing 1 toward another opening of the housing 1. The heat dissipation ducts 124 formed by each snap-fit ​​structure are arranged in parallel intervals to ensure that each heat dissipation duct 124 is independent of each other and that their air outlet and inlet directions do not interfere with each other.

[0048] In the third embodiment of this application, the length of the snap-fit ​​structure is set to be the same as the width of the end face 13. For details, please refer to further reference. Figure 10In this embodiment, the two end sidewalls of the snap-fit ​​structure are coplanar with the adjacent end faces 13 of the end face 13 on which it is disposed. This further increases the heat exchange area of ​​the snap-fit ​​structure, thereby improving the heat dissipation capacity of a single snap-fit ​​structure. In addition, the increased length of the snap-fit ​​structure also further increases the contact force area between the snap-fit ​​structures of different battery cells 100, ensuring reliable installation between the battery cells 100. The third embodiment proposed here can also be combined with the first and second embodiments described above. That is, the first snap-fit ​​part 111 and the second snap-fit ​​part 112 in the first embodiment are configured to extend from the adjacent end face 1313 of their disposed end face 1313 to another adjacent end face 1313, thereby expanding the overall heat dissipation area of ​​the snap-fit ​​structure and improving the heat exchange efficiency; or the first snap-fit ​​part 111, the second snap-fit ​​part 112 and the first extension part 113 in the second embodiment are configured to extend from the adjacent end face 13 of their disposed end face 13 to another adjacent end face 13, extending the length of the heat dissipation duct 124, thereby achieving a better heat dissipation effect.

[0049] It should be noted that the snap-fit ​​structure can be provided on one end face 13 of the housing 1, or on both end faces 13 of the housing 1, or on all end faces 13 of the housing 1. In one embodiment of this application, all four end faces 13 of the housing 1 are provided with snap-fit ​​structures. The snap-fit ​​structure can be the snap-fit ​​structure form in the first embodiment above, or the snap-fit ​​structure form in the second embodiment above. This application does not limit this. In the battery system assembly process, multiple cells 100 are arranged in an array. Each cell 100 located in the middle is configured to snap-fit ​​with the other four cells 100. Assembly is achieved by snap-fitting the snap-fit ​​structure on its end face 13 with the snap-fit ​​structure on one end face 13 of the other four adjacent cells 100.

[0050] The snap-fit ​​structure not only increases the overall heat dissipation area of ​​the casing but also creates expansion displacement space between adjacent cells 100. This expansion displacement space between the cells 100 in the battery system is designed to accommodate the volume expansion caused by chemical reactions during charging and discharging. This design prevents the cells 100 from squeezing each other during expansion, which could lead to casing deformation or internal structural damage, thus avoiding impacts on battery performance and lifespan. It also helps reduce safety risks caused by excessive battery expansion, such as short circuits or thermal runaway. Providing expansion displacement space is one of the important safety and performance assurance measures in battery system design. In this embodiment, the snap-fit ​​structures use a gap fit, and the gap between the snap-fit ​​structures can accommodate the expansion space requirements of the cells 100.

[0051] In another embodiment of this application, a single end face 13 is provided with two sets of snap-fit ​​structures. The two sets of snap-fit ​​structures are spaced apart, and the opening directions of the snap-fit ​​slots of the two sets of snap-fit ​​structures are opposite. This arrangement increases the contact area when the two sets of snap-fit ​​structures snap with the two sets of snap-fit ​​structures on another cell 100, thereby making the adjacent snap-fit ​​structures snap more tightly and ensuring that the connection of each cell 100 in the battery system is stable and reliable.

[0052] This application also proposes a battery pack comprising multiple cells as described above. Specifically, adjacent cells are assembled and snapped together via a first snap-fit ​​structure 11 and a second snap-fit ​​structure 12. After assembly, a portion of the first snap-fit ​​structure 11 is located in a second snap-fit ​​groove 12a, and a portion of the second snap-fit ​​structure 12 is located in the first snap-fit ​​groove 11a. The first snap-fit ​​structure 11 and the second snap-fit ​​structure 12 are clearance-fitted, allowing for a certain amount of movement to prevent breakage under stress. This battery pack employs all the technical solutions of all the above embodiments. Therefore, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0053] In addition, this application also provides a battery system, which includes the battery cell 100 provided in this application. This battery system can be used as a power source for an electrical device or as an energy storage unit for the device. Electrical devices may include, but are not limited to, mobile devices (e.g., mobile phones, laptops, etc.), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, range-extended vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0054] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery cell, characterized in that, The battery cell body includes a first end face (131) and a second end face (132) of the battery cell body, which are respectively provided with a first snap-fit ​​structure (11) and a second snap-fit ​​structure (12). The first end face (131) and the second end face (132) are arranged opposite to each other. The first snap-fit ​​structure (11) is used to snap-fit ​​with the second snap-fit ​​structure (12) of another adjacent battery cell.

2. The battery cell as described in claim 1, characterized in that, The first snap-fit ​​structure (11) has a first snap-fit ​​groove (11a), and the second snap-fit ​​structure (12) has a second snap-fit ​​groove (12a). Parts of the first snap-fit ​​structure (11) and parts of the second snap-fit ​​structure (12) are respectively snapped into the second snap-fit ​​groove (12a) and the first snap-fit ​​groove (11a).

3. The battery cell as described in claim 2, characterized in that, The first snap-fit ​​structure (11) includes a plurality of first snap-fit ​​members, which are spaced apart along the height direction of the battery cell; and The second snap-fit ​​structure (12) includes a plurality of second snap-fit ​​pieces, which are spaced apart along the height direction of the battery cell, and each first snap-fit ​​piece engages with a second snap-fit ​​piece of another battery cell.

4. The battery cell as described in claim 3, characterized in that, The first card connectors and the second card connectors are staggered with each other.

5. The battery cell as described in claim 3, characterized in that, The first latching member includes a first latching portion (111) and a second latching portion (112) connected to each other. The first latching portion (111) and the second latching portion (112) are arranged at an included angle. The first latching portion (111), the second latching portion (112), and the battery cell body together form the first latching groove (11a). The second latching member includes a third latching part (121) and a fourth latching part (122) connected to each other. The third latching part (121) and the fourth latching part (122) are arranged at an angle. The third latching part (121), the fourth latching part (122) and the battery cell body surround and form the second latching groove (12a).

6. The battery cell as described in claim 3, characterized in that, The first connector, the second connector, and the battery cell body are integrally formed.

7. The battery cell as described in claim 3, characterized in that, Each of the first snap-fit ​​components and the battery cell body, and each of the second snap-fit ​​components and the battery cell body respectively form a heat dissipation air duct (124).

8. The battery cell as described in claim 7, characterized in that, The plurality of heat dissipation ducts (124) are all arranged to extend along the first direction.

9. A battery pack, characterized in that, The battery pack includes a plurality of cells as described in any one of claims 1 to 8, each of the cells being engaged with a second snap-fit ​​structure (12) of another adjacent cell via the first snap-fit ​​structure (11).

10. A battery system, characterized in that, Includes the battery pack as described in claim 9.

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