Single battery and battery pack

Abstract

The invention belongs to the technical field of batteries, and discloses a single battery and a battery pack. The lithium ion battery comprises a shell and a pole group, the pole group is arranged in the shell, the pole group comprises two connected pole group structures, each pole group structure comprises a pole group body, a first convex part, a second convex part and a third convex part, a pole lug is arranged at the first end of the pole group body in the first direction, and the second end of the pole group body is connected to the other pole group structure; the first lug boss is arranged at the first end of the pole group body, and the first lug boss is wound on the periphery of a part of the tabs to form an accommodating groove for accommodating the tabs; the second lug boss is arranged on one side of the pole group body along the second direction, and the second lug bosses of the two pole group structures are connected to form an inserting part; the third lug boss is wound on the other side of the pole group body along the second direction, a groove is defined by the third lug boss and the other side of the pole group body along the second direction, and the grooves of the two pole group structures are connected to form an inserting groove; and the plugging groove of one pole group can be plugged with the plugging part of another pole group, so that the structural strength is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a single cell battery and a battery pack. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly higher requirements for their performance, capacity, and safety. The lithium-ion cell is the core component for battery pack safety and assembly, and its structural design is crucial to cell safety.

[0003] Currently, the space utilization rate of electrode assemblies in batteries is low. For example, other spaces at the electrode tabs cannot be utilized, preventing the battery capacity from being increased and failing to meet current demands for high capacity. Furthermore, individual batteries are typically cuboid or cylindrical, and their structural strength is only maintained by the casing, limiting the improvement of individual battery structural strength. When batteries are stacked into groups, they are merely in contact with each other, resulting in low connection strength between batteries and affecting the overall structural strength of the battery pack.

[0004] Therefore, there is an urgent need for a single-cell battery and a battery pack to solve the above-mentioned technical problems. Summary of the Invention

[0005] One object of the present invention is to provide a single cell that can improve its capacity and space utilization while improving its structural strength.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A single battery cell includes a casing and an electrode assembly, wherein the electrode assembly is disposed within the casing, and the electrode assembly includes two interconnected electrode assembly structures, wherein the electrode assembly structure includes:

[0008] The pole assembly body has a pole tab at its first end along the first direction and a second end connected to another pole assembly structure described above.

[0009] A first protrusion is provided at the first end of the electrode assembly body, and the first protrusion is arranged around the outer periphery of a portion of the electrode tabs to form a receiving groove for receiving the electrode tabs.

[0010] The second protrusion is provided on one side of the above-mentioned pole group body along the second direction, the second direction being perpendicular to the first direction, and the second protrusions of the two above-mentioned pole group structures are connected to form a plug-in portion.

[0011] The third protrusion is disposed around the other side of the pole group body along the second direction, and surrounds the other side of the pole group body along the second direction to form a groove. The grooves of the two pole group structures are connected to form a plug-in groove. The plug-in groove of one pole group can be plugged into the plug-in part of another pole group.

[0012] Optionally, the first protrusion includes:

[0013] The bottom wall is connected to the first end of the aforementioned pole assembly body;

[0014] Two sidewalls are connected to the first end of the electrode assembly body, and the two sidewalls are spaced apart on the bottom wall along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The bottom wall and the two sidewalls enclose the receiving groove. The first end of the electrode assembly body and the two sidewalls are connected to the electrode tab.

[0015] Optionally, along the first direction, the dimension of the receiving groove is E1, and satisfies: 5mm ≤ E1 ≤ 12mm; and / or,

[0016] Along the second direction described above, the dimension of the first protrusion is F1, the dimension of the receiving groove is F2, and both satisfy: 10mm ≤ F1 - F2 ≤ 60mm; and / or,

[0017] Along the third direction, the size of the above-mentioned pole group structure is A, the maximum size of the above-mentioned receiving groove is W1, the above-mentioned first direction, the above-mentioned second direction and the above-mentioned third direction are mutually perpendicular to each other, and satisfy: 70mm≤A≤295mm; 0.45≤W1 / A≤0.75.

[0018] Optionally, along the first direction, the dimension of the groove is L1, and the dimension of the second protrusion is L2, satisfying: 1.5mm ≤ L1 - L2 ≤ 4mm; and / or,

[0019] Along the second direction described above, the dimension of the groove is H1, and the dimension of the second protrusion is H2, satisfying: 0.2mm ≤ H1 - H2 ≤ 1.5mm; and / or,

[0020] Along the third direction, the size of the groove is W2, the size of the second protrusion is W3, the first direction, the second direction and the third direction are mutually perpendicular, and satisfy: W3 < W2.

[0021] Optionally, along the first direction, the distance between the side of the second protrusion facing the first end of the pole assembly body and the side of the first protrusion away from the pole assembly body is E2, and the dimension of the pole assembly structure is B, satisfying: 0.15 ≤ E2 / B ≤ 0.5; and / or,

[0022] Along the aforementioned third direction, the dimension A of the aforementioned pole group structure and the dimension W3 of the aforementioned second protrusion satisfy: 70mm≤A≤295mm; 0.2≤W3 / A≤0.33.

[0023] Optionally, the above-mentioned pole group structure further includes:

[0024] A first conductive layer and a second conductive layer are disposed at a distance from each other along a third direction at the second end of the electrode assembly body. The first direction, the second direction, and the third direction are perpendicular to each other. One of the first conductive layer and the second conductive layer is a negative conductive layer, and the other is a positive conductive layer. The first conductive layer in one electrode assembly structure is connected to the first conductive layer in another electrode assembly structure, and the second conductive layer in one electrode assembly structure is connected to the second conductive layer in another electrode assembly structure.

[0025] Optionally, one of the second ends of the pole group body in the two pole group structures is provided with a positioning protrusion and the other is provided with a positioning groove, and the positioning protrusion is inserted into the positioning groove.

[0026] Optionally, a gap is provided between the positioning protrusion on the side facing the positioning groove along the first direction and the positioning groove on the side facing the positioning protrusion along the first direction.

[0027] Optionally, the above gap is T, and satisfies: 0.5mm≤T≤1.5mm.

[0028] Another objective of this invention is to provide a battery pack that can improve the overall structural strength of the assembled individual battery cells, reduce the number of individual battery cells, and improve production efficiency.

[0029] To achieve this objective, the present invention adopts the following technical solution:

[0030] The battery pack comprises several individual batteries connected in sequence as described above.

[0031] The beneficial effects of this invention are:

[0032] This invention provides a single battery cell and a battery pack. A first protrusion is added to the electrode assembly body at the location of the electrode tabs, and a second and third protrusion are added along the thickness direction, increasing the volume and space utilization of the electrode assembly and improving the capacity of the single battery cell. Simultaneously, the third protrusion and the electrode assembly body form a groove, which combines to form a insertion slot, and the second protrusion combines to form a insertion part. The insertion slot and insertion part facilitate the assembly of the single battery cell into a pack. Furthermore, this single battery cell divides the electrode assembly into two connected electrode assembly structures, avoiding the problem of the casing and electrode assembly being unable to be installed due to the second and third protrusions, thus improving the assembly reliability of the single battery cell. Attached Figure Description

[0033] Figure 1 This is an isometric view of a single battery cell provided in a specific embodiment of the present invention;

[0034] Figure 2 This is an isometric view of the pole group from one perspective provided in a specific embodiment of the present invention;

[0035] Figure 3 This is an isometric view of the pole group from another perspective provided by a specific embodiment of the present invention;

[0036] Figure 4 This is a top view of the pole group provided in a specific embodiment of the present invention;

[0037] Figure 5 yes Figure 4 A magnified view of a section at point G in the middle;

[0038] Figure 6 This is a perspective view of the pole group provided in a specific embodiment of the present invention;

[0039] Figure 7 This is a side view of the second end of a pole group structure provided in a specific embodiment of the present invention;

[0040] Figure 8 This is an isometric view of a pole group structure provided in a specific embodiment of the present invention;

[0041] Figure 9 This is an isometric view of another pole group structure provided in a specific embodiment of the present invention.

[0042] In the picture:

[0043] 1. Electrode assembly; 2. Housing; 3. Cover plate;

[0044] 100. Pole group structure; 1001. Plug-in part; 1002. Plug-in slot; 1003. Gap;

[0045] 10. Electrode body; 101. First end; 102. Second end; 11. Electrode tab;

[0046] 20. First protrusion; 201. Receiving groove; 21. Bottom wall; 22. Side wall;

[0047] 30. Second protrusion; 40. Third protrusion; 50. Groove; 60. First conductive layer; 70. Second conductive layer; 80. Positioning protrusion; 90. Positioning groove. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," and "abutting" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0052] The following reference Figures 1 to 9 This invention introduces the single-cell battery and battery pack provided by the present invention.

[0053] It should be noted that the first direction in this embodiment is Figure 1 The X direction in the diagram refers to the length direction of a single cell, and the second direction is... Figure 1 The Z-direction, which is the thickness direction of a single cell, is the same as the Z-direction of the cell. The third direction is... Figure 1 The Y direction, which is the width direction of a single cell, is perpendicular to each other in the X, Y, and Z directions.

[0054] Please refer to Figures 1 to 6 This embodiment provides a single-cell battery, which includes a housing 2 and an electrode assembly 1. The electrode assembly 1 is disposed within the housing 2 and includes two interconnected electrode assembly structures 100. Each electrode assembly structure 100 includes an electrode assembly body 10, a first protrusion 20, a second protrusion 30, and a third protrusion 40. The electrode assembly body 10 has a tab 11 at its first end 101 along a first direction, and a second end 102 connected to the other electrode assembly structure 100. The first protrusion 20 is disposed at the first end 101 of the electrode assembly body 10, and the first protrusion 20 surrounds the outer periphery of a portion of the tab 11 to form a receiving portion. The electrode lug 11 has a receiving groove 201; a second protrusion 30 is disposed on one side of the electrode assembly body 10 along a second direction, the second direction being perpendicular to the first direction, and the second protrusions 30 of the two electrode assembly structures 100 are connected to form a plug-in portion 1001; a third protrusion 40 is disposed around the other side of the electrode assembly body 10 along the second direction, and surrounds the other side of the electrode assembly body 10 along the second direction to form a groove 50, and the grooves 50 of the two electrode assembly structures 100 are connected to form a plug-in groove 1002; the plug-in groove 1002 of one electrode assembly 1 can be plugged into the plug-in portion 1001 of another electrode assembly 1.

[0055] In this embodiment, the single battery cell has a first protrusion 20 added at the position where the tab 11 is located on the electrode assembly body 10, and a second protrusion 30 and a third protrusion 40 added along its thickness direction, respectively, increasing the volume and space utilization of the electrode assembly 1 and improving the capacity of the single battery cell. Simultaneously, the third protrusion 40 and the electrode assembly body 10 enclose a groove 50, which together form a insertion slot 1002, and the second protrusion 30 together form an insertion part 1001. The insertion slot 1002 and the insertion part 1001 make it easier to assemble the single battery cell into a group. Furthermore, this single battery cell divides the electrode assembly 1 into two connected electrode assembly structures 100, avoiding the problem of the housing 2 and electrode assembly 1 being unable to be installed due to the second protrusion 30 and the third protrusion 40, thus improving the assembly reliability of the single battery cell.

[0056] Please refer to Figure 4 and Figure 6Specifically, the first protrusion 20 includes a bottom wall 21 and two side walls 22. The bottom wall 21 is connected to the first end 101 of the electrode assembly body 10; both side walls 22 are connected to the first end 101 of the electrode assembly body 10, and the two side walls 22 are spaced apart on the bottom wall 21 along a third direction, with the first direction, the second direction, and the third direction being mutually perpendicular; the bottom wall 21 and the two side walls 22 enclose a receiving groove 201. This fills the unused space at the location of the electrode tab 11 on the electrode assembly body 10, specifically filling three surfaces of the electrode tab 11, to avoid wasting space, increase its capacity, and also reserve one surface for external connection of the electrode tab 11. Furthermore, this arrangement ensures that the electrode tab 11 is positioned within the receiving groove 201, limiting the connection between the electrode tab 11 and the externally assembled structure in at least two directions, thereby improving the connection stability between the electrode tab 11 and the externally assembled structure.

[0057] Optionally, the first end 101 and the two sidewalls 22 of the electrode assembly body 10 are connected to the tabs 11. This arrangement increases the area of ​​the tabs 11 and enlarges its dispersion area, thereby helping to dissipate heat at the electrode post and further improving the battery's performance.

[0058] Optionally, the sidewall 22 facing the tab 11 is inclined so that the angle between the first end 101 of the pole body 10 and the inclined surface is greater than 90°, forming a guide inclined surface so that the external assembly structure can be inserted into the receiving groove 201 and connected to the tab 11.

[0059] Optionally, along the first direction, the size of the receiving groove 201 is E1, and satisfies: 5mm≤E1≤12mm; this is a preferred numerical range to achieve filling around the electrode 11 and also to satisfy the space reserved for assembly between the electrode 11 and the external assembly structure.

[0060] For example, E1 satisfies any value within the range of 5mm≤E1≤12mm, such as 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, etc.

[0061] Optionally, along the second direction, the size of the first protrusion is F1, and the size of the receiving groove 201 is F2, satisfying: 10mm≤F1-F2≤60mm; this is a preferred numerical range. This arrangement ensures the volume of the first protrusion while accommodating the placement and installation of the tab 11, thereby increasing the capacity of the single battery cell.

[0062] For example, F1-F2 can be any value within the range of 10mm≤F1-F2≤60mm, such as 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, etc.

[0063] Optionally, along the third direction, the dimension of the electrode assembly structure 100 is A, and the maximum dimension of the receiving groove 201 is W1. The first direction, the second direction, and the third direction are mutually perpendicular and satisfy: 70mm≤A≤295mm; 0.45≤W1 / A≤0.75; this is a preferred numerical range. This arrangement ensures the volume of the first protrusion while accommodating the placement and installation of the electrode tab 11, thereby increasing the capacity of the single battery cell.

[0064] For example, W1 / A satisfies any value within the range of 0.45≤W1 / A≤0.75, such as 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, etc.

[0065] By limiting the dimensions of the receiving groove 201 in each direction as described above, the receiving groove 201 can meet the requirements for the placement and installation of the tab 11 while ensuring the volume of the first protrusion, thereby achieving an increase in the capacity of the single battery cell.

[0066] Please refer to Figure 4 , Figure 6 and Figure 7 In order to ensure that the insertion slot 1002 of one pole group 1 and the insertion part 1001 of the other pole group 1 can be inserted into each other, specifically, the size of the groove 50 is larger than the size of the second protrusion 30 along the first direction, the second direction and the third direction, so as to realize the insertion and engagement of the insertion part 1001 and the insertion slot 1002.

[0067] Optionally, along the first direction, the size of the groove 50 is L1 and the size of the second protrusion 30 is L2, and the following condition is met: 1.5mm≤L1-L2≤4mm; thus, the unilateral difference between the two along the first direction can be limited, so that the insertion part 1001 of one pole group 1 can be inserted into the insertion slot 1002 of the other pole group 1 in the first direction.

[0068] For example, L1-L2 can be any value within the range of 1.5mm≤L1-L2≤4mm, such as 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.

[0069] Optionally, along the second direction, the size of the groove 50 is H1, and the size of the second protrusion 30 is H2, and satisfies: 0.2mm≤H1-H2≤1.5mm; thus, the unilateral difference between the two along the second direction can be limited, so that the insertion part 1001 of one pole group 1 can be inserted into the insertion slot 1002 of the other pole group 1 in the second direction.

[0070] For example, H1-H2 can be any value within the range of 0.2mm≤H1-H2≤1.5mm, such as 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, etc.

[0071] Optionally, along the third direction, the size of the groove 50 is W2, and the size of the second protrusion 30 is W3. The first direction, the second direction, and the third direction are mutually perpendicular and satisfy: W3 < W2. This can limit the unilateral difference between the two along the third direction, so that the insertion part 1001 of one pole group 1 can be inserted into the insertion slot 1002 of another pole group 1 in the third direction.

[0072] With the above settings, the insertion slot 1002 of one pole group 1 and the insertion part 1001 of another pole group 1 can be inserted into each other.

[0073] Optionally, the second protrusion 30 is an elongated structure extending along the first direction, and the groove 50 is an elongated structure extending along the first direction. Since the pole group 1 is composed of two pole group structures 100 spliced ​​together, the extension length of the second protrusion 30 and the extension length of the groove 50 are not limited to whether they directly penetrate both ends of the pole group structure 100 along the first direction, and both can achieve the installation and fit between the pole group 1 and the housing 2.

[0074] For example, in this embodiment, neither the extension length of the second protrusion 30 nor the extension length of the groove 50 directly penetrates both ends of the electrode assembly structure 100 along the first direction. This arrangement allows two adjacent individual cells to be limited in both the first and third directions during assembly, thereby improving the connection strength between the two adjacent individual cells and thus improving the structural strength of the assembly.

[0075] Optionally, along the first direction, the distance between the side of the second protrusion 30 facing the first end 101 of the pole body 10 and the side of the first protrusion 20 away from the pole body 10 is E2, and the size of the pole structure 100 is B, and satisfies: 0.15≤E2 / B≤0.5; this is a preferred numerical range.

[0076] For example, E2 / B can satisfy any value within the range of 0.15≤E2 / B≤0.5, such as 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, etc.

[0077] Optionally, along a third direction, the dimensions A of the electrode structure 100 and W3 of the second protrusion 30 satisfy: 70mm≤A≤295mm; 0.2≤W3 / A≤0.33; this is a preferred numerical range, which improves both the capacity and structural strength of the single cell.

[0078] For example, W3 / A satisfies any value within the range of 0.2≤W3 / A≤0.33, such as 0.2, 0.23, 0.25, 0.28, 0.3, 0.33, etc.

[0079] Please refer to Figures 7 to 9 Furthermore, the aforementioned electrode assembly structure 100 also includes a first conductive layer 60 and a second conductive layer 70. The first conductive layer 60 and the second conductive layer 70 are spaced apart along a third direction at the second end 102 of the electrode assembly body 10. The first direction, the second direction, and the third direction are mutually perpendicular. One of the first conductive layer 60 and the second conductive layer 70 is a negative conductive layer, and the other is a positive conductive layer. The first conductive layer 60 in one electrode assembly structure 100 is connected to the first conductive layer 60 in the other electrode assembly structure 100, and the second conductive layer 70 in one electrode assembly structure 100 is connected to the second conductive layer 70 in the other electrode assembly structure 100. When the two electrode assembly structures 100 are installed, the electrical connection between the two electrode assembly structures 100 can be achieved through the connection of the first conductive layer 60 and the connection of the second conductive layer 70.

[0080] For example, in this embodiment, the first conductive layer 60 is a positive conductive layer and the second conductive layer 70 is a negative conductive layer. The positive conductive layer is formed by stacking multiple positive electrode plates extending out of the electrode assembly body 10 and then coating them with a positive conductive coating. The negative conductive layer is formed by stacking multiple negative electrode plates extending out of the electrode assembly body 10 and then coating them with a negative conductive coating.

[0081] Optionally, the above-mentioned electrode assembly structure 100 further includes an insulating layer, which is disposed at the second end 102 of the electrode assembly body 10 and between the first conductive layer 60 and the second conductive layer 70, so as to achieve insulation between the first conductive layer 60 and the second conductive layer 70.

[0082] Alternatively, the insulating layer extends through the diaphragm from the stacked electrode assembly body 10 and is then coated with an insulating curing material such as ceramic to form the shape.

[0083] Furthermore, one of the second ends 102 of the pole group body 10 in the two pole group structures 100 is provided with a positioning protrusion 80, and the other is provided with a positioning groove 90. The positioning protrusion 80 is inserted into the positioning groove 90 to achieve the positioning and installation of the two pole group structures 100. Specifically, the positioning groove 90 and the positioning protrusion 80 are both provided at the insulating layer of the second end 102 of the pole group body 10 in the corresponding pole group structure 100. While providing positioning guidance, they also increase the path between the first conductive layer 60 and the second conductive layer 70, thereby further improving the insulation effect on both.

[0084] Please refer to Figure 4 and Figure 5Optionally, a gap 1003 is provided between the side of the positioning protrusion 80 facing the positioning groove 90 in the first direction and the side of the positioning groove 90 facing the positioning protrusion 80 in the first direction. This allows for sufficient clearance when the positioning protrusion 80 and the positioning groove 90 are engaged, thereby ensuring that the first conductive layer 60 abuts against the first conductive layer 60 in the other electrode group structure 100, and the second conductive layer 70 abuts against the second conductive layer 70 in the other electrode group structure 100. This avoids the connection between the first conductive layer 60 and the first conductive layer 60 in the other electrode group structure 100, and the connection between the second conductive layer 70 and the second conductive layer 70 in the other electrode group structure 100, which would be restricted after the positioning protrusion 80 and the positioning groove 90 abut. This improves the reliability of the single cell.

[0085] Optionally, the gap 1003 is T, and satisfies: 0.5mm≤T≤1.5mm, so that while positioning and guiding, the connection between the first conductive layer 60 and the connection between the second conductive layer 70 are ensured.

[0086] For example, T satisfies any value within the range of 0.5mm≤T≤1.5mm, such as 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, etc.

[0087] Furthermore, the aforementioned housing 2 has the same shape as the electrode assembly 1 to facilitate the installation of the electrode assembly 1.

[0088] Specifically, the housing 2 has at least one opening to allow for the installation of the electrode assembly 1. For example, in this embodiment, the electrode assembly 1 is divided into two electrode assembly structures 100; therefore, the housing 2 has two openings corresponding to each other along the first direction to allow for the installation of the two electrode assembly structures 100.

[0089] Furthermore, the single cell also includes at least one cover plate 3, which is sealed to the opening and forms a sealed receiving space with the housing 2 for accommodating the electrode assembly 1.

[0090] In this embodiment, to verify the effectiveness of the various structural parameters of the single cell of the present invention, as shown in Table 1, 12 groups of single cells with different structural parameters were selected for single cell performance testing.

[0091] Table 1

[0092]

[0093] Among them, Examples 1#, 2#, 3#, 4#, 5#, and 6# are all examples that conform to the above parameter range, and their cell yield is greater than 98%. During performance testing, no abnormalities were found in the strength or contact assembly of electrode group 1 in any of the above six examples. Electrode group 1 and tab 11 showed no damage or deformation. The current carrying capacity and capacity of tab 11 meet the cell requirements. The temperature of tab 11 also meets the cell requirements. The tests show that the performance of the single-cell battery meeting the range described in this example is superior.

[0094] By comparing the H1-H2 parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 7#, it can be seen that Examples 1#, 2#, 3#, 4#, 5#, and 6# all meet the value range of this parameter. The H1-H2 parameter segment in Example 7# is less than the lower threshold of its value range, while the value ranges of the remaining parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 7# all meet the value range of this example. The comparison shows that the yield rate of the battery cell in Example 7# is less than 98%. During performance testing, due to the insufficient H1-H2 values, interference and scratches occurred during the assembly of the corresponding individual batteries, reducing the assembly yield and efficiency of the battery pack.

[0095] By comparing the H1-H2 parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 8#, it can be seen that Examples 1#, 2#, 3#, 4#, 5#, and 6# all meet the value range of this parameter. The H1-H2 parameter segment in Example 8# exceeds the upper threshold of its value range, while the value ranges of the remaining parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 8# all meet the value range of this example. The comparison shows that the yield rate of the cell in Example 8# is less than 98%. During performance testing, the increased value of H1-H2 leads to an excessively small size of the second protrusion of the electrode group 1 in the second direction or an excessively large size of the groove 50, affecting the overall capacity increase of the single cell, reducing the structural strength of the electrode group 1, and increasing the gap between the convex and concave surfaces of the two single cells during assembly, thus reducing the structural strength of the single cell and its assembly.

[0096] By comparing the W1 / A parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 9#, it can be seen that Examples 1#, 2#, 3#, 4#, 5#, and 6# all meet the value range of this parameter. The W1 / A parameter segment in Example 9# is less than the lower threshold of its value range, while the value ranges of the remaining parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 9# all meet the value range of this example. The comparison shows that the yield rate of the battery cell in Example 9# is less than 98%. During performance testing, due to the insufficient value of W1 / A, the size ratio of the third-party upward-facing receiving slot 201 is insufficient. This results in the corresponding cover plate 3's overcurrent capacity not meeting the fast charging requirements of the single battery, and the temperature rise of the single battery is too high, reducing the performance of the single battery.

[0097] By comparing the W1 / A parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 10#, it can be seen that Examples 1#, 2#, 3#, 4#, 5#, and 6# all meet the value range of this parameter. The W1 / A parameter segment in Example 10# exceeds the upper threshold of its value range, while the value ranges of the remaining parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 10# all meet the value range of this example. The comparison shows that the yield rate of the battery cell in Example 10# is less than 98%. During performance testing, the excessively large size of the third-party upward-facing receiving slot 201 leads to insufficient size of the first protrusion 20 in the third-party upward-facing direction, affecting the capacity increase, reducing the end support area, and making the electrode group 1 prone to deformation and damage.

[0098] By comparing the W3 / A parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 11#, it can be seen that Examples 1#, 2#, 3#, 4#, 5#, and 6# all meet the value range of this parameter. The W3 / A parameter segment in Example 11# is less than the lower limit threshold of its value range, while the value ranges of the remaining parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 11# all meet the value range of this example. The comparison shows that the yield rate of the cell in Example 11# is less than 98%. During performance testing, due to the insufficient W3 / A, the proportion of the second protrusion 30 in the third-party upward direction is insufficient, reducing the positioning strength between individual cells. Simultaneously, there is a problem that the second protrusion 30 is easily damaged, which is detrimental to the production and strength of electrode group 1.

[0099] By comparing the W3 / A parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 12#, it can be seen that Examples 1#, 2#, 3#, 4#, 5#, and 6# all meet the value range of this parameter. The W3 / A parameter segment in Example 12# exceeds the upper threshold of its value range, while the value ranges of the remaining parameter segments in Examples 1#, 2#, 3#, 4#, 5#, 6#, and 12# all meet the value range of this example. The comparison shows that the yield rate of the battery cell in Example 12# is less than 98%. During performance testing, due to the excessively large W3 / A, the proportion of the second protrusion 30 in the third-direction upward direction is too large, reducing the size of the second protrusion 30 and the third protrusion 40. This reduces the strength of the electrode group 1 at the corresponding groove 50, increases the difficulty of molding the shell 2, and increases the cost.

[0100] In summary, as long as the structural parameters of each component are within the set range, it can be ensured that the product capacity is increased, the connection strength between each individual battery cell is increased, the assembly difficulty is low, and the assembly efficiency is high.

[0101] This embodiment also provides a battery pack comprising a plurality of individual battery cells as described in any of the above-described schemes, connected in sequence. By configuring these individual battery cells, the capacity of each individual battery cell in the battery pack is increased, the number of individual battery cells required for assembly is reduced, assembly is convenient, and production efficiency is improved. Simultaneously, it also increases the connection strength between the assembled individual battery cells, thereby improving the structural strength of the assembled battery pack.

[0102] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A single cell characterized by, The application relates to a single battery, comprising a shell and a pole group, wherein the pole group is arranged in the shell, the pole group comprises two pole group structures connected with each other, and each pole group structure comprises: a pole group body, a first end of the pole group body is provided with a pole lug in a first direction, and a second end of the pole group body is connected to another pole group structure; a first protruding part arranged at the first end of the pole group body, and the first protruding part is arranged around the outer periphery of part of the pole lug to form a containing groove containing the pole lug; a second protruding part arranged at one side of the pole group body in a second direction, wherein the second direction is perpendicular to the first direction, and the second protruding parts of the two pole group structures are connected to form a plug-in part; a third protruding part arranged around the other side of the pole group body in the second direction, and the third protruding part and the other side of the pole group body in the second direction form a groove, and the grooves of the two pole group structures are connected to form a plug-in groove; and the plug-in groove of one pole group can be plugged into the plug-in part of another pole group.

2. The cell according to claim 1, wherein The first protruding part comprises: a bottom wall connected to the first end of the pole group body; two side walls, each connected to the first end of the pole group body, and the two side walls are arranged on the bottom wall in a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other; the bottom wall and the two side walls form the containing groove, and the first end of the pole group body and the two side walls are connected with the pole lug.

3. The single battery according to claim 1, wherein: in the first direction, the size of the containing groove is E1, and 5mm<=E1<=12mm is satisfied; and / or in the second direction, the size of the first protruding part is F1, the size of the containing groove is F2, and 10mm<=F1-F2<=60mm is satisfied; and / or in the third direction, the size of the pole group structure is A, the maximum size of the containing groove is W1, the first direction, the second direction and the third direction are perpendicular to each other, and 70mm<=A<=295mm and 0.45<=W1 / A<=0.75 are satisfied.

4. The single battery according to claim 1, wherein: in the first direction, the size of the groove is L1, the size of the second protruding part is L2, and 1.5mm<=L1-L2<=4mm is satisfied; and / or in the second direction, the size of the groove is H1, the size of the second protruding part is H2, and 0.2mm<=H1-H2<=1.5mm is satisfied; and / or in the third direction, the size of the groove is W2, the size of the second protruding part is W3, the first direction, the second direction and the third direction are perpendicular to each other, and W3W2 is satisfied.

5. The single battery according to claim 4, wherein: in the first direction, the distance between the side of the second protruding part facing the first end of the pole group body and the side of the first protruding part away from the pole group body is E2, the size of the pole group structure is B, and 0.15<=E2 / B<=0.5 is satisfied; and / or In the third direction, a size A of the pole group structure and a size W3 of the second protrusion satisfy: 70mm≤A≤295mm; 0.2≤W3 / A≤0.

33.

6. The cell according to claim 1, wherein The pole group structure further comprises: a first conductive layer and a second conductive layer, which are arranged at the second end of the pole group body in the third direction, the first direction, the second direction and the third direction being perpendicular to each other, one of the first conductive layer and the second conductive layer being a negative conductive layer, and the other being a positive conductive layer; the first conductive layer in one pole group structure is connected with the first conductive layer in another pole group structure, and the second conductive layer in one pole group structure is connected with the second conductive layer in another pole group structure.

7. The cell according to claim 1, wherein One of the second ends of the pole group body in the two pole group structures is provided with a positioning protrusion, and the other is provided with a positioning groove, the positioning protrusion being inserted into the positioning groove.

8. The cell according to claim 7, wherein A gap is arranged between a side of the positioning protrusion facing the positioning groove in the first direction and a side of the positioning groove facing the positioning protrusion in the first direction.

9. The cell according to claim 8, wherein The gap is T, and satisfies: 0.5mm≤T≤1.5mm.

10. A battery pack, characterized by, A plurality of single batteries as claimed in any one of claims 1-9 are connected in sequence.

Images