Battery cells, battery cell modules and their mounting structures

Abstract

This application relates to a battery cell, a battery cell module, and a battery cell mounting structure thereof. The battery cell mounting structure includes a housing, a sealing ring, and busbars. The housing has mounting openings at both ends, with two steps on the outer walls of each opening. Two sealing rings are respectively disposed at the two mounting openings, each including a first sidewall and a second sidewall perpendicular to the outer wall. The first sidewall engages with the step. Two busbars have a wave-shaped load-bearing structure and seal the two mounting openings to form a positive and a negative electrode. The busbars overlap the end faces of the mounting openings, and the second sidewall overlaps the side of the busbar facing away from the mounting opening. When the battery cell mounting structures are stacked in the Z-axis, the positive electrode of one battery cell mounting structure contacts the negative electrode of another, achieving current transmission and realizing a solderless electrical connection. Through the wave-shaped load-bearing structure of the busbars, the two busbars are pressed together and adhere to form a stable contact ring, ensuring contact area and contact stability.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to battery cells, battery cell modules and their cell mounting structures. Background Technology

[0002] Lithium-ion power batteries are widely used in energy storage, automobiles, and power tools. A battery cell is the smallest unit of a lithium-ion battery product and also serves as an energy storage unit. Multiple cells are arranged sequentially and packaged together using the same battery module clamping plate, module end plate, binding straps, and other components. When connected to the outside through a unified boundary, a battery cell module is formed. Structurally, battery cell modules come in various forms, including standard modules, large modules, and module-less modules.

[0003] For household electronics with low current (toys, watches, etc.), spring contacts are sufficient to meet the requirements for current connection. However, for power battery modules with high current, a larger contact area and a more robust contact method are required. Currently in the power battery field, poor electrical connection may cause potential hazards such as electric sparks and electrode melting. Therefore, welding connections have the advantage of high reliability. Regardless of the system assembly method (cylindrical, pouch, prismatic, etc.), the cells are connected together by bus welding (aluminum wire welding, resistance welding, laser welding) to achieve the current transmission function of the battery module or system.

[0004] However, welding, as a traditional electrical connection method for battery cell modules, is expensive for precision welding (laser welding, resistance welding, etc.) in the power battery field, both in terms of welding components and welding equipment. Furthermore, battery cell modules formed by welding are not repairable. With the widespread adoption of battery cell modules and the increase in the number of integrated battery cell modules, a problem with one battery cell in a battery cell module will lead to the scrapping of the entire battery cell module, greatly reducing the usability of the battery cell module and causing incalculable environmental pollution. In addition, the welding components at the end of the battery cell prevent the battery cell from bearing force in the Z direction, and the battery cell module can only be arranged in the XY direction, but not stacked in the Z direction. Summary of the Invention

[0005] Therefore, it is necessary to provide a battery cell, a battery cell module, and a battery cell mounting structure to address the issue that battery cell modules cannot simultaneously achieve maintainability and stable connection.

[0006] A battery cell mounting structure, the battery cell mounting structure comprising:

[0007] The housing has a cylindrical structure with openings at both ends. The interior of the housing is a mounting cavity for mounting the electrode tabs and electrode rolls. The two ends of the housing are two mounting ports, and the outer walls of the two mounting ports are respectively provided with two steps.

[0008] A closed ring, two of which are respectively disposed in two of the mounting ports, the closed rings are sleeved on the outer wall surface of the mounting ports, the closed rings include a ring body parallel to the outer wall surface, a first side wall and a second side wall respectively disposed at both ends on the axial direction of the ring body and perpendicular to the outer wall surface, the first side wall being engaged with the step;

[0009] A busbar, two of which are respectively disposed at two mounting ports and the mounting ports are closed. Along the direction from the center of the busbar to the edge of the busbar, the busbar has a wave-shaped load-bearing structure. The busbar overlaps the end face of the mounting port, and the second sidewall overlaps the side of the busbar facing away from the end face of the mounting port.

[0010] In one embodiment, the cell mounting structure further includes a pressure relief structure disposed at both ends of the side wall of the housing. The pressure relief structure has a thinning structure, and the wall thickness at the thinning structure is 20% to 30% of the wall thickness of the side wall of the housing.

[0011] In one embodiment, the pressure relief structure includes a step protruding from the outer wall of the housing on the same horizontal line and a notch recessed into the inner wall of the housing. The step has a first right-angled triangle structure with the line containing the outer wall as the right-angled side, and the notch has a second right-angled triangle structure with the line containing the inner wall as the right-angled side. The first right-angled triangle structure is parallel to the second right-angled triangle structure. The thinning structure is formed between the first right-angled triangle structure and the second right-angled triangle structure.

[0012] In one embodiment, the central portion of the busbar has a raised spherical arc surface, and the edge of the busbar has an annular plane parallel to the end face of the mounting port. Between the spherical arc surface and the annular plane, there is an annular arc surface with a convex direction opposite to the spherical arc surface. Along the Z-axis stacking direction, the spherical arc surface located at the bottom of the cell mounting structure is recessed into the mounting cavity, and the spherical arc surface located at the top of the cell mounting structure protrudes outward from the mounting cavity.

[0013] In one embodiment, the housing has a regular prism structure with openings at both ends, and the number of sidewalls of the regular prism structure is equal to eight.

[0014] In one embodiment, the cell mounting structure further includes a sealing ring, the sealing ring including a first ring plane and a second ring plane facing away from the first ring plane, the first ring plane being parallel to the second ring plane; the sealing ring is disposed between the end face of the mounting port and the busbar, the first ring plane abutting against the end face of the mounting port, and the second ring plane abutting against the busbar.

[0015] In one embodiment, the length of the second sidewall along the radial direction of the closed ring is greater than the length of the first sidewall, and the diameter of the busbar is greater than the diameter of the mounting port.

[0016] This application also proposes a battery cell, the battery cell including the battery cell mounting structure as described above; and further comprising,

[0017] The electrode roll is placed inside the mounting cavity;

[0018] The two tabs are connected at one end to the two ends of the electrode roll, and at the other end to the two busbars, forming the positive and negative busbars of the battery cell.

[0019] In one embodiment, the battery cell further includes an insulating plate, with two insulating plates respectively disposed at both ends of the electrode roll. The insulating plate has through holes, and the electrode tab is connected to the busbar through the through holes.

[0020] This application also proposes a battery cell module, which includes a plurality of battery cells as described above. The battery cell module includes multiple layers of the battery cells arranged along the Z direction. Each layer of the battery cells includes a plurality of the battery cells arranged in an array along the X and Y directions. The sidewalls of the plurality of battery cells abut each other, and a channel is formed between any four adjacent battery cells. The positive electrode busbar of each battery cell abuts against the negative electrode busbar.

[0021] In the technical solution of this application, the battery cell mounting structure includes two busbars at each end. Each busbar has a positive and a negative electrode. The busbars are positioned at the mounting opening and, together with a sealing ring, close the mounting opening to form a sealed mounting cavity. When multiple battery cell mounting structures are stacked in the Z-axis direction, the positive busbar of one battery cell mounting structure contacts the negative busbar of another, enabling current transmission. This achieves a solderless electrical connection between the battery cells. The battery cells are assembled into a battery cell module by placing them at their ends, allowing for arbitrary combination and disassembly of the individual cells within the module, effectively improving the maintainability of the battery cell module. The Z-axis stacking of the battery cell mounting structures is achieved through the wave-shaped load-bearing structure of the busbars at both ends. The two busbars are pressed against each other and in close contact, forming a stable contact ring, ensuring contact area and contact stability. Furthermore, the wave-shaped load-bearing structure ensures that when the wave arc at the center of the busbar is compressed, the wave arc at the edge of the busbar is subjected to pressure in the opposite direction. This results in the second sidewall of the busbar being pushed by the busbar when it comes into contact with the second sidewall of the sealing ring. Under the interlocking action of the first sidewall and the step, the sealing ring is more firmly locked to the installation opening, which increases the overall load-bearing capacity of the busbar and ensures the airtightness of the installation cavity. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the battery cell structure of the battery cell, battery cell module and battery cell mounting structure of this application.

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the battery cell, battery cell module, and battery cell mounting structure of this application.

[0024] Figure 3 for Figure 2 A partially enlarged structural diagram.

[0025] Figure 4 for Figure 3 A partially enlarged structural diagram.

[0026] Figure 5 This is a schematic diagram of the battery cell, battery cell module, and battery cell mounting structure of this application.

[0027] Explanation of component labels in the attached diagram:

[0028] 1000, Cell mounting structure; 2000, Cell; 3000, Cell module; 100, Housing; 110, Mounting cavity; 120, Outer wall surface; 130, Step; 140, Inner wall surface; 200, Closing ring; 210, Ring body; 220, First side wall; 230, Second side wall; 300, Busbar; 310, Spherical arc surface; 320, Annular plane; 330, Annular arc surface; 400, Pressure relief structure; 410, Thinning structure; 420, Notch; 500, Sealing ring; 610, Electrode roll; 620, Electrode tab; 700, Insulating plate; 800, Channel. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] See Figures 1 to 4 , Figures 1 to 4 The diagram shows a schematic diagram and a cross-sectional view of the battery cell 2000, battery cell module 3000, and battery cell mounting structure 1000 proposed in this application. The battery cell mounting structure 1000 includes a housing 100, a closing ring 200, and a busbar 300. The housing 100 has a cylindrical structure with openings at both ends. The interior of the housing 100 is a mounting cavity 110 for mounting tabs 620 and electrode coils 610. Each end of the housing 100 has two mounting openings, and the outer wall surface 120 of each mounting opening has two steps 130.

[0036] Two closing rings 200 are respectively disposed at two mounting ports. The closing rings 200 are sleeved on the outer wall surface 120 of the mounting ports. The closing rings 200 include a ring body 210 parallel to the outer wall surface 120, and a first side wall 220 and a second side wall 230 respectively disposed at both ends of the ring body 210 in the axial direction and perpendicular to the outer wall surface 120. The first side wall 220 is engaged with the step 130. The material of the closing rings 200 can be insulating rigid materials such as plastic, and no specific limitation is made here.

[0037] Two busbars 300 are respectively disposed at two mounting ports and the mounting ports are closed. Along the center of the busbar 300 towards its edge, the busbar 300 has a wave-shaped load-bearing structure. The busbar 300 overlaps the end face of the mounting port, and the second sidewall 230 overlaps the side of the busbar 300 facing away from the mounting port. The busbar 300 is made of nickel-plated steel sheet to conduct current. The wave-shaped load-bearing structure of the busbar 300 is formed by stamping.

[0038] With this configuration, the battery cell mounting structure 1000 includes two busbars 300 at each end. The two busbars 300 have positive and negative terminals. The busbars 300 are located at the mounting opening and cooperate with the sealing ring 200 to close the mounting opening and form a sealed mounting cavity 110. When multiple battery cell mounting structures 1000 are stacked in the Z-direction, the positive busbar 300 of one battery cell mounting structure 1000 and the negative busbar 300 of another battery cell mounting structure 1000 come into contact and realize current transmission, realizing a solderless electrical connection between the battery cells 2000. The battery cells 2000 are connected to form a battery cell module 3000 by placing them at their ends, so that the individual battery cells 2000 of the battery cell module 3000 can be arbitrarily combined and disassembled, effectively improving the maintainability of the battery cell module 3000.

[0039] Traditional cell mounting structures 1000 typically have terminals on top, but these terminals, as functional devices, cannot bear loads, preventing Z-axis stacking. This application achieves Z-axis stacking of the cell mounting structure 1000 through a wave-shaped load-bearing structure at both ends of the busbars 300. The two busbars 300 are pressed against each other and in close contact, forming a stable contact ring, ensuring contact area and stability. The wave-shaped load-bearing structure ensures that when the central wave arc of the busbar 300 is pressed, the wave arc at the edge of the busbar 300 experiences pressure in the opposite direction. This causes the second sidewall 230 of the closing ring 200 to be pushed by the busbar 300 when it comes into contact with it. Under the locking action of the first sidewall 220 and the step 130, the closing ring 200 is more firmly locked into the mounting opening, increasing the overall load-bearing capacity of the busbar 300 and ensuring the airtightness of the mounting cavity 110.

[0040] See Figure 3 and Figure 4 The cell mounting structure 1000 also includes a pressure relief structure 400, which is disposed at both ends of the side wall of the housing 100. The pressure relief structure 400 has a thinning structure 410, and the wall thickness at the thinning structure 410 is 20% to 30% of the wall thickness of the side wall of the housing 100. The pressure relief method of the traditional cell mounting structure is usually to install a pressure relief valve at the top. If the top is blocked, there is a risk of explosion. The top of the cell needs to reserve pressure relief space and cannot be stacked in the Z direction. In this application, the pressure relief structure 400 is disposed on the side wall of the housing 100, and the top space of the cell mounting structure 1000 is released through the side exhaust structure, so that the cell mounting structure 1000 can be stacked in the Z direction. The pressure relief structure 400 has a thinning structure 410. When the battery cell 2000 runs out of control and continues to produce gas, the gas pressure in the mounting cavity 110 increases sharply, and the stress concentration at the thinning structure 410 will cause it to deform and break through the thinning structure 410 before reaching the critical point of explosion, thus rupturing the thinning structure 410 and achieving pressure relief.

[0041] Specifically, the pressure relief structure 400 includes a step 130 protruding from the outer wall surface 120 of the housing 100 on the same horizontal line and a notch 420 recessed into the inner wall surface 140 of the housing 100. The step 130 has a first right-angled triangle structure with the line containing the outer wall surface 120 as one leg, and the notch 420 has a second right-angled triangle structure with the line containing the inner wall surface 140 as one leg. The first right-angled triangle structure is parallel to the second right-angled triangle structure. A thinning structure 410 is formed between the first right-angled triangle structure and the second right-angled triangle structure.

[0042] For example, the housing 100 is made of steel, and a notch 420 is formed by stamping steel parts. The excess material from stamping to form the notch 420 protrudes outward to form a step 130.

[0043] Specifically, see Figure 3The busbar 300 has a raised spherical arc surface 310 at its center and an annular plane 320 parallel to the end face of the mounting opening at its edge. Between the spherical arc surface 310 and the annular plane 320 is an annular arc surface 330 with its protruding direction facing away from the spherical arc surface 310. The busbars 300 located at both ends of the housing 100 are positioned in the same direction, with the spherical arc surfaces 310 arranged in the same direction. Along the Z-axis stacking direction, the spherical arc surface 310 at the bottom of the cell mounting structure 1000 is recessed into the mounting cavity 110, serving as the negative electrode of the cell 2000. The spherical arc surface 310 at the top of the cell mounting structure 1000 protrudes outward from the mounting cavity 110, serving as the positive electrode of the cell 2000. This ensures that when the two cell mounting structures 1000 are stacked in the Z-axis direction and the busbars 300 are in contact with each other… The bottom busbar 300 (negative electrode) of the stacked cell mounting structure 1000 presses down on the spherical arc surface 310 of the top busbar 300 (positive electrode) of the cell mounting structure 1000 below, raising its edge. This makes the closing ring 200 more firmly locked at the edge. At the same time, the overall force of the busbar 300 is transmitted to the housing 100, effectively improving the force-bearing capacity of the busbar 300 along the Z direction, thereby realizing the Z-direction stacking of the cell mounting structure 1000 and eliminating the need for welding connection.

[0044] See Figure 1 The housing 100 has a regular prism structure with openings at both ends, and the number of sidewalls of the regular prism structure is equal to eight. The regular octagonal prism housing allows the cell mounting structures 1000 to be arranged in an array along the X and Y directions, with adjacent cell mounting structures 1000 arranged in a way that the sidewalls fit together, saving space. At the same time, the housing 100 can be closely attached to the liquid cooling plate through the flat outer wall surface 120 to achieve contact cooling and improve the heat dissipation efficiency of the cell 2000.

[0045] Furthermore, the cell mounting structure 1000 also includes a sealing ring 500. The sealing ring 500 includes a first ring plane and a second ring plane facing away from the first ring plane, with the first ring plane parallel to the second ring plane. The sealing ring 500 is disposed between the end face of the mounting port and the busbar 300, with the first ring plane abutting against the end face of the mounting port and the second ring plane abutting against the busbar 300. The sealing ring 500 can be made of sealing materials such as silicone or rubber, and is not specifically limited here. The sealing ring 500 ensures that the mounting cavity 110 is airtight, thus isolating the inside of the cell 2000 from air and moisture.

[0046] In one embodiment, the length of the second sidewall 230 along the radial direction of the closure ring 200 is greater than the length of the first sidewall 220 to increase the stability of the closure ring 200 when snapped in place, and the diameter of the busbar 300 is greater than the diameter of the mounting port so that the busbar 300 can overlap the end of the mounting port.

[0047] This application also proposes a battery cell 2000, which includes the aforementioned battery cell mounting structure 1000. It also includes electrode rolls 610 and tabs 620. The electrode rolls 610 are carriers of active chemical substances in the battery cell 2000. The electrode rolls 610 are placed inside the mounting cavity 110. One end of each of the two tabs 620 is connected to one end of the electrode roll 610, and the other end of each tab 620 is connected to one of two busbars 300, forming the positive and negative busbars of the battery cell 2000.

[0048] Furthermore, the battery cell 2000 also includes an insulating plate 700. Two insulating plates 700 are respectively disposed at both ends of the electrode coil 610. The insulating plates 700 have through holes, and the electrode tabs 620 are connected to the busbar 300 through the through holes. The insulating plates 700 can be made of insulating materials such as plastic, and no specific limitation is made here.

[0049] See Figure 5 , Figure 5 A schematic diagram of a battery cell module 3000 according to this application is shown. The battery cell module 3000 includes multiple battery cells 2000 as described above. The battery cell module 3000 includes multiple layers of battery cells 2000 arranged along the Z direction. Each layer of battery cells 2000 includes multiple battery cells 2000 arrayed along the X and Y directions. The sidewalls of the multiple battery cells 2000 abut each other. A channel 800 is formed between any four adjacent battery cells 2000. The channel 800 is rhomboid. The positive terminal busbar of each battery cell 2000 abuts against the negative terminal busbar. The battery cell module 3000 can be arbitrarily expanded along the X, Y, and Z directions, and the rhomboid channel 800 is automatically reserved after being grouped. The channel 800 can be used as a wire harness channel or an explosion-proof smoke exhaust path.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A cell mounting structure, characterized in that, The cell mounting structure includes: The housing has a cylindrical structure with openings at both ends. The interior of the housing is a mounting cavity for mounting the electrode tabs and electrode rolls. The two ends of the housing are two mounting ports, and the outer walls of the two mounting ports are respectively provided with two steps. A closed ring, two of which are respectively disposed in two of the mounting ports, the closed rings are sleeved on the outer wall surface of the mounting ports, the closed rings include a ring body parallel to the outer wall surface, a first side wall and a second side wall respectively disposed at both ends on the axial direction of the ring body and perpendicular to the outer wall surface, the first side wall being engaged with the step; A busbar, two of which are respectively disposed in two mounting ports and close the mounting ports, has a wave-shaped load-bearing structure along the direction from the center of the busbar to its edge. The busbar overlaps the end face of the mounting port, and the second sidewall overlaps the side of the busbar facing away from the end face of the mounting port. The central portion of the busbar has a raised spherical arc surface, and the edge of the busbar has an annular plane parallel to the end face of the mounting port. Between the spherical arc surface and the annular plane, there is an annular arc surface with a raised direction facing away from the spherical arc surface. Along the Z-axis stacking direction, the spherical arc surface at the bottom of the cell mounting structure is recessed into the mounting cavity, and the spherical arc surface at the top of the cell mounting structure protrudes outward from the mounting cavity.

2. The cell mounting structure according to claim 1, characterized in that, The cell mounting structure also includes a pressure relief structure, which is disposed at both ends of the side wall of the housing. The pressure relief structure has a thinning structure, and the wall thickness at the thinning structure is 20% to 30% of the wall thickness of the side wall of the housing.

3. The cell mounting structure according to claim 2, characterized in that, The pressure relief structure includes a step protruding from the outer wall of the housing on the same horizontal line and a notch recessed into the inner wall of the housing. The step has a first right-angled triangle structure with the line containing the outer wall as the right-angled side, and the notch has a second right-angled triangle structure with the line containing the inner wall as the right-angled side. The first right-angled triangle structure is parallel to the second right-angled triangle structure. The thinning structure is formed between the first right-angled triangle structure and the second right-angled triangle structure.

4. The cell mounting structure according to claim 1, characterized in that, The shell has a regular prism structure with openings at both ends, and the number of sidewalls of the regular prism structure is equal to eight.

5. The cell mounting structure according to claim 1, characterized in that, The cell mounting structure further includes a sealing ring, which includes a first ring plane and a second ring plane facing away from the first ring plane, the first ring plane being parallel to the second ring plane; the sealing ring is disposed between the end face of the mounting port and the busbar, the first ring plane abutting against the end face of the mounting port, and the second ring plane abutting against the busbar.

6. The cell mounting structure according to claim 1, characterized in that, The length of the second sidewall along the radial direction of the closed ring is greater than the length of the first sidewall, and the diameter of the busbar is greater than the diameter of the mounting port.

7. A battery cell, characterized in that, The battery cell includes the battery cell mounting structure as described in any one of claims 1-6; further include, The electrode roll is placed inside the mounting cavity; The two tabs are connected at one end to the two ends of the electrode roll, and at the other end to the two busbars, forming the positive and negative busbars of the battery cell.

8. The battery cell according to claim 7, characterized in that, The battery cell also includes an insulating plate, with two insulating plates respectively disposed at both ends of the electrode roll. The insulating plate has through holes, and the electrode tab is connected to the busbar through the through holes.

9. A battery cell module, characterized in that, The battery cell module includes a plurality of battery cells as described in any one of claims 7-8. The battery cell module includes multiple layers of the battery cells arranged along the Z direction. Each layer of the battery cells includes a plurality of the battery cells arranged in an array along the X and Y directions. The sidewalls of the plurality of battery cells abut each other. A channel is formed between any four adjacent battery cells. The positive electrode busbar of each battery cell abuts against the negative electrode busbar.

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