Aluminum connection structure and cylindrical battery cell module

Abstract

The present application provides an aluminum connection structure and a cylindrical battery cell module. The above-mentioned aluminum connection structure includes a positive electrode aluminum sheet and a plurality of negative electrode aluminum sheets. The two ends of the positive electrode aluminum sheet are respectively provided with a positive electrode arc edge. The positive electrode aluminum sheet is provided with a plurality of avoidance notches. The positive electrode aluminum sheet is also provided with a plurality of explosion-proof holes. The plurality of explosion-proof holes are arranged one by one opposite to the explosion-proof valves of the plurality of first battery cells. The first ends of the plurality of negative electrode aluminum sheets are bent to form the edge of the positive electrode aluminum sheet, and each negative electrode aluminum sheet is located on one side of the positive electrode aluminum sheet; the second ends of the plurality of negative electrode aluminum sheets are used to be connected one by one to the negative end faces of the plurality of second battery cells arranged side by side; the second end of one of the negative electrode aluminum sheets is provided with a negative electrode arc edge, the center of the negative electrode arc edge is located between the centers of the two positive electrode arc edges, and the center of any positive electrode arc edge is located between the centers of the other positive electrode arc edge and the negative electrode arc edge. In this way, the battery safety is higher and the welding accuracy is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of cylindrical battery cell modules, and in particular to an aluminum connection structure and a cylindrical battery cell module. Background Art

[0002] For cylindrical battery cell modules with tabs on the same side, that is, cylindrical battery cell modules with positive and negative poles on the same side, the cylindrical battery cell modules mainly include multiple groups of cylindrical batteries and connecting plates. Each group of cylindrical batteries includes multiple battery cells arranged side by side and spaced apart. The multiple battery cells are electrically connected by welding the connecting plates to the positive end face or negative end face of each battery cell.

[0003] However, the connecting piece will hinder the exhaust of the explosion-proof valve, resulting in poor battery safety performance. Moreover, due to the irregular shape of the connecting piece, it is difficult for the welding device to automatically find the welding position of the connecting piece, resulting in poor welding accuracy. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an aluminum connection structure and a cylindrical battery cell module that have higher battery safety and higher welding precision.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] An aluminum connection structure, comprising:

[0007] A positive electrode aluminum sheet, each having a positive arc edge at each end, the positive electrode aluminum sheet being used to connect to the positive end surfaces of a plurality of first battery cells spaced side by side, the positive electrode aluminum sheet being provided with a plurality of avoidance notches, the plurality of avoidance notches being used to correspond one-to-one to accommodate portions of the positive ends of the plurality of first battery cells, the positive electrode aluminum sheet being further provided with a plurality of explosion-proof holes, the plurality of explosion-proof holes being used to be arranged one-to-one opposite to the explosion-proof valves of the plurality of first battery cells;

[0008] A plurality of negative electrode aluminum sheets, wherein the first ends of the plurality of negative electrode aluminum sheets are bent to form the edge of the positive electrode aluminum sheet, and the first ends of the plurality of negative electrode aluminum sheets are used to be arranged in a one-to-one correspondence with the plurality of first battery cells, and each of the negative electrode aluminum sheets is located on one side of the positive electrode aluminum sheet; the second ends of the plurality of negative electrode aluminum sheets are used to be connected in a one-to-one correspondence to the negative end surfaces of the plurality of second battery cells arranged side by side; the second end of one of the negative electrode aluminum sheets is provided with a negative electrode arc edge, the center of the negative electrode arc edge is located between the centers of the two positive electrode arc edges, and the center of any positive electrode arc edge is located between the center of the other positive electrode arc edge and the center of the negative electrode arc edge.

[0009] In one embodiment, the arc edge of each positive electrode coincides with the edge of the corresponding first battery cell.

[0010] In one embodiment, the plurality of negative electrode aluminum sheets are parallel.

[0011] In one embodiment, each of the negative electrode aluminum sheets is parallel to the positive electrode aluminum sheet.

[0012] In one embodiment, each of the negative electrode aluminum sheets is in the shape of a long strip.

[0013] In one embodiment, each of the explosion-proof holes is a circular hole.

[0014] In one embodiment, each of the avoidance gaps is adapted to the negative terminal of the corresponding first battery cell.

[0015] A cylindrical battery cell module includes the aluminum connection structure described in any of the above embodiments, and the cylindrical battery cell module also includes a first battery group and a second battery group arranged at intervals, the first battery group includes a plurality of the first battery cells arranged at intervals side by side, and the second battery group includes a plurality of the second battery cells arranged at intervals side by side.

[0016] In one embodiment, the positive electrode aluminum sheets are laser welded to the positive end surfaces of the plurality of first battery cells.

[0017] In one embodiment, the second ends of the plurality of negative electrode aluminum sheets are laser welded to the negative end surfaces of the plurality of second battery cells in a one-to-one correspondence.

[0018] Compared with the prior art, the present invention has at least the following advantages:

[0019] 1. Since the positive aluminum sheet is also provided with a plurality of explosion-proof holes, the plurality of explosion-proof holes are used to be arranged one by one opposite to the explosion-proof valves of the plurality of first battery cells, so that the explosion-proof valves have space to open, so that the explosion-proof valves can be opened and exhausted in time when the battery is bloated, thereby improving the safety performance of the battery.

[0020] 2. A negative arc edge is provided at the second end of one of the negative electrode aluminum sheets. The center of the negative arc edge is located between the centers of the two positive arc edges. The center of any positive arc edge is located between the center of the other positive arc edge and the center of the negative arc edge. The line connecting the center of the negative arc edge and the centers of the two positive arc edges forms a triangle, so that the welding device can determine the welding position of the aluminum connection structure through the center of the negative arc edge and the centers of the two positive arc edges, thereby improving the welding accuracy and avoiding the problem of the welding device welding to the plastic bracket of the battery cell.

[0021] 3. Compared with the traditional nickel connecting piece, the aluminum connecting structure of the present application has a stronger flow capacity.

[0022] 4. Compared with traditional nickel connecting sheets, the aluminum connecting structure of the present application has stronger tensile properties, which makes it easier for the aluminum connecting structure to form steps with a height difference between the positive and negative electrodes, thereby improving the production qualification rate of the aluminum connecting structure and suppressing the problem of a decrease in the welding yield of the aluminum connecting structure due to unqualified aluminum connecting structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 Schematic diagram of the structure of a cylindrical battery module according to one embodiment;

[0025] Figure 2 for Figure 1 The schematic diagram of the aluminum connection structure of the cylindrical battery module shown;

[0026] Figure 3 for Figure 1 The schematic diagram of the aluminum connection structure of the cylindrical battery cell module shown is from another perspective. DETAILED DESCRIPTION

[0027] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] The present application provides an aluminum connection structure, including a positive aluminum sheet and multiple negative aluminum sheets. A positive arc edge is respectively provided at both ends of the positive aluminum sheet. The positive aluminum sheets are respectively used to connect to the positive end surfaces of multiple first battery cells arranged side by side and spaced apart. The positive aluminum sheet is provided with multiple avoidance notches, and the multiple avoidance notches are used to accommodate the positive end parts of the multiple first battery cells in a one-to-one correspondence. The positive aluminum sheet is also provided with multiple explosion-proof holes, and the multiple explosion-proof holes are used to be arranged one by one relative to the explosion-proof valves of the multiple first battery cells. The first ends of the multiple negative aluminum sheets are bent to form the edge of the positive aluminum sheet, and the first ends of the multiple negative aluminum sheets are used to be arranged in one-to-one correspondence with the multiple first battery cells, and each negative aluminum sheet is located on one side of the positive aluminum sheet; the second ends of the multiple negative aluminum sheets are used to be connected one-to-one to the negative end surfaces of the multiple second battery cells arranged side by side; the second end of one of the negative aluminum sheets is provided with a negative arc edge, the center of the negative arc edge is located between the centers of the two positive arc edges, and the center of any positive arc edge is located between the center of the other positive arc edge and the center of the negative arc edge.

[0031] The present application also provides a cylindrical battery cell module, including the above-mentioned aluminum connection structure. The cylindrical battery cell module also includes a first battery group and a second battery group arranged at intervals. The first battery group includes a plurality of first battery cells arranged side by side at intervals, and the second battery group includes a plurality of second battery cells arranged side by side at intervals.

[0032] The above-mentioned aluminum connection structure and cylindrical battery cell module, because the positive aluminum sheet also has multiple explosion-proof holes, the multiple explosion-proof holes are used to be arranged one by one opposite the explosion-proof valves of the multiple first battery cells, so that the explosion-proof valves have space to open, so that the explosion-proof valves can open and vent in time when the battery is bloated, thereby improving the safety performance of the battery. In addition, the second end of one of the negative aluminum sheets is provided with a negative arc edge, the center of the negative arc edge is located between the centers of the two positive arc edges, and the center of any positive arc edge is located between the center of another positive arc edge and the center of the negative arc edge. The line connecting the center of the negative arc edge and the center of the two positive arc edges forms a triangle, so that the welding device can determine the welding position of the aluminum connection structure through the center of the negative arc edge and the center of the two positive arc edges, thereby improving welding accuracy and avoiding the problem of the welding device welding to the plastic bracket of the battery cell. Compared with traditional nickel connecting sheets, the aluminum connection structure of the present application has a stronger current capacity. Compared with traditional nickel connecting sheets, the aluminum connecting structure of the present application has stronger tensile properties, making it easier for the aluminum connecting structure to form steps with a height difference between the positive and negative poles, thereby improving the production qualification rate of the aluminum connecting structure and suppressing the problem of a decrease in the welding yield of the aluminum connecting structure due to unqualified aluminum connecting structures.

[0033] To better understand the technical solutions and beneficial effects of the present application, the present application is further described in detail below with reference to specific embodiments:

[0034] like Figure 1 As shown, a cylindrical battery cell module 10 of one embodiment includes an aluminum connection structure 100. The cylindrical battery cell module 10 also includes a first battery group 200 and a second battery group 300 arranged at intervals. The first battery group 200 includes a plurality of first battery cells 210 arranged side by side at intervals. The second battery group 300 includes a plurality of second battery cells 310 arranged side by side at intervals.

[0035] like Figure 1 and Figure 2 As shown, in one embodiment, the aluminum connection structure 100 includes a positive aluminum sheet 110 and multiple negative aluminum sheets 120. Each end of the positive aluminum sheet 110 is provided with a positive arc edge 111. The positive aluminum sheet 110 is used to connect to the positive end surfaces of multiple first battery cells 210 arranged side by side and spaced apart. The positive aluminum sheet 110 is provided with multiple avoidance notches 1101. The multiple avoidance notches 1101 are used to accommodate the positive end portions of the multiple first battery cells 210 in a one-to-one correspondence. Each avoidance notch 1101 can serve as a pre-positioning function for the aluminum connection structure 100, allowing the aluminum connection structure 100 to be placed in the corresponding position more efficiently. The positive aluminum sheet 110 is also provided with multiple explosion-proof holes 1102. The multiple explosion-proof holes 1102 are used to be arranged one-to-one with the explosion-proof valves of the multiple first battery cells 210. The first ends of the multiple negative aluminum sheets 120 are bent to form the edge of the positive aluminum sheet 110. The first ends of the multiple negative aluminum sheets 120 are used to be arranged in a one-to-one correspondence with the multiple first battery cells 210, and each negative aluminum sheet 120 is located on one side of the positive aluminum sheet 110; the second ends of the multiple negative aluminum sheets 120 are used to be connected one-to-one to the negative end surfaces of the multiple second battery cells 310 arranged side by side.

[0036] like Figure 2 As shown, further, a negative arc edge 121 is provided at the second end of one of the negative aluminum sheets 120. The center of the negative arc edge 121 is located between the centers of the two positive arc edges 111. The center of any positive arc edge 111 is located between the center of the other positive arc edge 111 and the center of the negative arc edge 121. The line connecting the center of the negative arc edge 121 and the centers of the two positive arc edges 111 forms a triangle, so that the welding device can determine the welding position of the aluminum connection structure 100 through the center of the negative arc edge 121 and the centers of the two positive arc edges 111. In this embodiment, the aluminum connection structure 100 is an aluminum structure, that is, the aluminum connection structure 100 is made of aluminum. The positive aluminum sheets 110 are welded to the positive end surfaces of multiple first battery cells 210 arranged side by side and spaced apart. The second ends of the multiple negative aluminum sheets 120 are welded to the negative end surfaces of multiple second battery cells 310 arranged side by side and spaced apart.

[0037] like Figures 1 to 3As shown, it can be understood that for the cylindrical battery cell module 10 with the tabs on the same side, since the negative end surface of each battery cell protrudes from the corresponding positive end surface, there is a height difference between the negative end surface and the positive end surface of each battery cell. In order to enable the aluminum connection structure 100 to be welded normally, a step is required to be formed between each negative aluminum sheet 120 and the positive aluminum sheet 110, and the height difference of the step is consistent with the height difference between the positive and negative poles of each battery cell.

[0038] It should be noted that the welding device determines the welding position of the aluminum connection structure 100 through three points, which belongs to the existing technology, and the method of determining the position of the aluminum connection structure 100 is not within the scope of protection of this application, and is therefore not described in detail in this application.

[0039] The above-mentioned cylindrical battery cell module 10 and aluminum connection structure 100, since the positive aluminum sheet 110 is also provided with multiple explosion-proof holes 1102, the multiple explosion-proof holes 1102 are used to be arranged one by one opposite to the explosion-proof valves of the multiple first battery cells 210, so that the explosion-proof valves have space to open, so that the explosion-proof valves can be opened and exhausted in time when the battery is bloated, thereby improving the safety performance of the battery. Furthermore, a negative arc edge 121 is provided at the second end of one of the negative aluminum sheets 120. The center of the negative arc edge 121 is located between the centers of the two positive arc edges 111. The center of any positive arc edge 111 is located between the center of the other positive arc edge 111 and the center of the negative arc edge 121. The line connecting the center of the negative arc edge 121 and the centers of the two positive arc edges 111 forms a triangle, allowing the welding device to determine the welding position of the aluminum connection structure 100 through the center of the negative arc edge 121 and the centers of the two positive arc edges 111, thereby improving welding accuracy and avoiding the problem of the welding device welding to the plastic bracket of the battery cell. Compared with traditional nickel connecting sheets, the aluminum connection structure 10 of the present application has a stronger current carrying capacity. Compared with traditional nickel connecting sheets, the aluminum connecting structure 10 of the present application has stronger tensile properties, making it easier for the aluminum connecting structure 10 to form steps with a height difference between the positive and negative electrodes, thereby improving the production qualification rate of the aluminum connecting structure 10 and suppressing the problem of a decrease in the welding yield of the aluminum connecting structure 10 due to unqualified aluminum connecting structure 10.

[0040] like Figure 1 As shown, in one embodiment, each positive arc edge 111 coincides with the edge of the corresponding first battery cell 210, so that the two ends of the positive aluminum sheet 110 coincide with the corresponding first battery cell 210, thereby improving the structural compactness of the cylindrical battery cell module 10.

[0041] like Figure 1 and Figure 2As shown, in one embodiment, the multiple negative aluminum sheets 120 are parallel. In this embodiment, because the multiple negative aluminum sheets 120 are parallel and the multiple negative aluminum sheets 120 are welded one-to-one to the negative end surfaces of the second battery cells 310, the negative end surfaces of the multiple second battery cells 310 are parallel, and thus the multiple second battery cells 310 are parallel, making the second battery pack 300 more compact.

[0042] like Figure 1 and Figure 2 As shown, in one embodiment, each negative aluminum sheet 120 is parallel to the positive aluminum sheet 110. In this embodiment, since each negative aluminum sheet 120 is welded to the negative end surface of the second battery cell 310, and the positive aluminum sheet 110 is welded to the positive end surface of the first battery cell 210, and each negative aluminum sheet 120 is parallel to the positive aluminum sheet 110, the first battery cell 210 and the second battery cell 310 are parallel, thereby improving the structural compactness of the cylindrical battery cell module 10.

[0043] like Figure 2 As shown, in one embodiment, each negative electrode aluminum sheet 120 is in the shape of an elongated strip, so that the aluminum connection structure 100 has a high degree of structural compactness.

[0044] like Figure 2 As shown, in one embodiment, each explosion-proof hole 1102 is a circular hole, so that the explosion-proof valve has a space to open, so as to improve the ability of the explosion-proof valve to exhaust in time.

[0045] like Figure 2 As shown, in one embodiment, each avoidance notch 1101 is adapted to the negative terminal of the corresponding first battery cell 210 , so that each avoidance notch 1101 has a pre-positioning function, thereby improving the welding efficiency of the aluminum connection structure 100 .

[0046] like Figure 2 As shown, in one embodiment, the positive aluminum sheet 110 is laser welded to the positive end surfaces of the plurality of first battery cells 210. In this embodiment, the positive aluminum sheet 110 is laser welded to the positive end surfaces of the corresponding first battery cells 210.

[0047] like Figure 2 As shown, in one embodiment, the second ends of the plurality of negative aluminum sheets 120 are laser welded to the negative end surfaces of the plurality of second battery cells 310 in a one-to-one correspondence. In this embodiment, the second end of each negative aluminum sheet 120 is laser welded to the negative end surface of the corresponding second battery cell 310.

[0048] like Figure 2As shown, in one embodiment, each negative aluminum sheet 120 is formed with a through hole 1103 at the connection with the positive aluminum sheet 110. That is, each negative aluminum sheet 120 is provided with a through hole 1103, and the multiple negative aluminum sheets 120 are connected to the multiple explosion-proof holes 1102 in a one-to-one correspondence. In this embodiment, since each negative aluminum sheet 120 is formed with a through hole 1103 at the connection with the positive aluminum sheet 110, each negative aluminum sheet 120 is easier to bend into shape, and each negative aluminum sheet 120 is less likely to rebound after being bent, so that the height difference between each negative aluminum sheet 120 and the positive aluminum sheet 110 is maintained at a preset value.

[0049] The present application also provides a punching and bending process, and the aluminum connection structure 100 is prepared by the punching and bending process, and the punching and bending process includes: providing an aluminum plate; performing an outer shape cutting operation on the aluminum plate to cut out the outer shape of the aluminum connection structure 100 on the aluminum plate, thereby forming a first semi-finished product, the first semi-finished product includes a positive aluminum sheet 110 and a plurality of negative aluminum sheets 120, both ends of the positive aluminum sheet 110 have a positive arc edge 111, the positive aluminum sheet 110 is formed with a plurality of spaced-apart avoidance notches 1101, and the plurality of negative aluminum sheets 120 are parallel and spaced-apart, the first end of each negative aluminum sheet 120 is connected to the positive aluminum sheet 110, wherein the second end of a negative aluminum sheet 120 has a negative arc edge 121, and the negative arc edge 121 is formed on the positive aluminum sheet 110. The center of the arc edge 121 is located between the centers of the two positive arc edges 111, and the center of any positive arc edge 111 is located between the centers of the other positive arc edge 111 and the negative arc edge 121; a punching operation is performed on the first semi-finished product to form a plurality of explosion-proof holes 1102 on the first semi-finished product, specifically, a plurality of explosion-proof holes 1102 are formed on the positive aluminum sheet 110, and the plurality of explosion-proof holes 1102 are arranged in a one-to-one correspondence with the plurality of avoidance notches 1101, thereby obtaining a second semi-finished product; a bending operation is performed on the second semi-finished product to form a step between each negative aluminum sheet 120 and the positive aluminum sheet 110, and the plurality of negative aluminum sheets 120 remain parallel after bending, thereby obtaining an aluminum connection structure 100. In this embodiment, the aluminum connection structure 100 is obtained by cutting, punching, and bending the aluminum plate, thereby improving the manufacturing efficiency of the aluminum connection structure 100.

[0050] In the above-mentioned punching and bending process, since the positive aluminum sheet 110 is also provided with a plurality of explosion-proof holes 1102, the plurality of explosion-proof holes 1102 are used to be arranged one by one opposite to the explosion-proof valves of the plurality of first battery cells 210, so that the explosion-proof valves have space to open, so that the explosion-proof valves can be opened and exhausted in time when the battery is bloated, thereby improving the safety performance of the battery. Furthermore, a negative arc edge 121 is provided at the second end of one of the negative aluminum sheets 120. The center of the negative arc edge 121 is located between the centers of the two positive arc edges 111. The center of any positive arc edge 111 is located between the center of the other positive arc edge 111 and the center of the negative arc edge 121. The line connecting the center of the negative arc edge 121 and the centers of the two positive arc edges 111 forms a triangle, allowing the welding device to determine the welding position of the aluminum connection structure 100 through the center of the negative arc edge 121 and the centers of the two positive arc edges 111, thereby improving welding accuracy and avoiding the problem of the welding device welding to the plastic bracket of the battery cell. Compared with traditional nickel connecting sheets, the aluminum connection structure 10 of the present application has a stronger current carrying capacity. Compared with traditional nickel connecting sheets, the aluminum connecting structure 10 of the present application has stronger tensile properties, making it easier for the aluminum connecting structure 10 to form steps with a height difference between the positive and negative electrodes, thereby improving the production qualification rate of the aluminum connecting structure 10 and suppressing the problem of a decrease in the welding yield of the aluminum connecting structure 10 due to unqualified aluminum connecting structure 10.

[0051] Compared with the prior art, the present invention has at least the following advantages:

[0052] 1. Since the positive electrode aluminum sheet 110 is also provided with a plurality of explosion-proof holes 1102, the plurality of explosion-proof holes 1102 are arranged one by one opposite to the explosion-proof valves of the plurality of first battery cells 210, so that the explosion-proof valves have space to open, so that the explosion-proof valves can be opened and exhausted in time when the battery is bloated, thereby improving the safety performance of the battery.

[0053] 2. A negative arc edge 121 is provided at the second end of one of the negative electrode aluminum sheets 120. The center of the negative arc edge 121 is located between the centers of the two positive arc edges 111. The center of any positive arc edge 111 is located between the center of the other positive arc edge 111 and the center of the negative arc edge 121. The line connecting the center of the negative arc edge 121 and the centers of the two positive arc edges 111 forms a triangle. This allows the welding device to determine the welding position of the aluminum connection structure 100 through the center of the negative arc edge 121 and the centers of the two positive arc edges 111, thereby improving welding accuracy and avoiding the problem of the welding device welding to the plastic bracket of the battery cell.

[0054] 3. Compared with the traditional nickel connecting piece, the aluminum connecting structure 10 of the present application has a stronger current carrying capacity.

[0055] 4. Compared with traditional nickel connecting sheets, the aluminum connecting structure 10 of the present application has stronger tensile properties, which makes it easier for the aluminum connecting structure 10 to form steps with a height difference between the positive and negative electrodes, thereby improving the production qualification rate of the aluminum connecting structure 10 and suppressing the problem of a decrease in the welding yield of the aluminum connecting structure 10 due to unqualified aluminum connecting structures 10.

[0056] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An aluminum connection structure, characterized in that: include: A positive electrode aluminum sheet, each having a positive arc edge at each end, the positive electrode aluminum sheet being used to connect to the positive end surfaces of a plurality of first battery cells spaced side by side, the positive electrode aluminum sheet being provided with a plurality of avoidance notches, the plurality of avoidance notches being used to correspond one-to-one to accommodate portions of the positive ends of the plurality of first battery cells, the positive electrode aluminum sheet being further provided with a plurality of explosion-proof holes, the plurality of explosion-proof holes being used to be arranged one-to-one opposite to the explosion-proof valves of the plurality of first battery cells; A plurality of negative aluminum sheets, wherein the first ends of the plurality of negative aluminum sheets are bent to form the edge of the positive aluminum sheet, the first ends of the plurality of negative aluminum sheets are used to be arranged in one-to-one correspondence with the plurality of first battery cells, and each of the negative aluminum sheets is located on one side of the positive aluminum sheet; the second ends of the plurality of negative aluminum sheets are used to be connected in one-to-one correspondence to the negative end surfaces of the plurality of second battery cells arranged side by side; the second end of one of the negative aluminum sheets is provided with a negative arc edge, the center of the negative arc edge is located between the centers of the two positive arc edges, and the center of any positive arc edge is located between the center of the other positive arc edge and the center of the negative arc edge; each positive arc edge coincides with the edge of the corresponding first battery cell; and the plurality of negative aluminum sheets are parallel.

2. The aluminum connection structure according to claim 1, characterized in that: Each of the negative electrode aluminum sheets is parallel to the positive electrode aluminum sheet.

3. The aluminum connection structure according to claim 1, characterized in that: Each of the negative electrode aluminum sheets is in the shape of a long strip.

4. The aluminum connection structure according to claim 1, characterized in that: Each of the explosion-proof holes is a round hole.

5. The aluminum connection structure according to any one of claims 1 to 4, characterized in that: Each of the avoidance gaps is adapted to the negative terminal of the corresponding first battery cell.

6. A cylindrical battery cell module, characterized in that: The cylindrical battery cell module comprises the aluminum connection structure according to any one of claims 1 to 5, wherein the first battery group and the second battery group are arranged at intervals, the first battery group comprises a plurality of the first battery cells arranged side by side at intervals, and the second battery group comprises a plurality of the second battery cells arranged side by side at intervals.

7. The cylindrical battery cell module according to claim 6, characterized in that: The positive aluminum sheets are laser welded to the positive end surfaces of the first battery cells.

8. The cylindrical battery cell module according to claim 6 or 7, characterized in that: The second ends of the plurality of negative electrode aluminum sheets are laser welded one by one to the negative end surfaces of the plurality of second battery cells.

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