Cell top cover and battery

Abstract

A cell top cover and a battery. The cell top cover comprises a cover plate body (1) provided with a first mounting through hole (11), a riveting block (2) provided with a second mounting through hole (21), and a terminal post (3), wherein the terminal post (3) comprises a limiting portion (31) and a main body portion (32). The limiting portion (31) abuts against the side of the cover plate body (1) facing away from the riveting block (2). The main body portion (32) is inserted into the first mounting through hole (11) and the second mounting through hole (21), and is provided with a groove (34) on the side facing away from the limiting portion (31) to form a connecting flange (33) riveted to the riveting block (2), wherein the length dimension of the connecting flange (33) is defined as a, the thickness dimension of the connecting flange (33) is defined as b, the length dimension a satisfies a ≥ 1 mm, the thickness dimension b satisfies b ≥ 0.5 mm, and 1 mm ≤ a / b ≤ 3 mm.

Description

Battery cell top cover and battery

[0001] This application claims priority to the Chinese patent application No. 202410612956.0, filed on May 17, 2024, with the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, for example to a battery cell top cover and a battery. BACKGROUND

[0003] With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the use performance and safety of lithium ion batteries are increasingly required. The lithium battery top cover, as a component in the lithium ion battery, first plays a sealing role by being welded with the aluminum shell to isolate the internal and external environments, and second plays a current guiding role by connecting the internal and external circuits to deliver the internal current of the battery to the outside through the top cover pole. The top cover of the traditional blade cell is generally composed of a riveting block, an aluminum sheet, a pole, an upper plastic, a lower plastic, and a sealing element. SUMMARY

[0004] The present application provides a battery cell top cover and a battery, which has a simple assembly process and low manufacturing cost.

[0005] In one aspect, the present application provides a battery cell top cover, which comprises:

[0006] a cover plate body, the cover plate body being provided with a first mounting through hole;

[0007] a riveting block, the riveting block being arranged on one side of the cover plate body and provided with a second mounting through hole in communication with the first mounting through hole;

[0008] a pole, the pole comprising a limiting portion and a main body portion, the limiting portion being in abutment with the side of the cover plate body away from the riveting block, the main body portion being arranged in the first mounting through hole and the second mounting through hole, and a recess being provided at the end of the main body portion away from the limiting portion to form a connecting flange for riveting with the riveting block;

[0009] the length of the connecting flange is a, the thickness of the connecting flange is b, the length a is greater than or equal to 1 millimeter, the thickness b is greater than or equal to 0.5 millimeter, and 1 millimeter ≤ a / b ≤ 3 millimeters is satisfied.

[0010] In some embodiments, the second mounting through hole is a countersunk hole, comprising a first hole segment for the main body portion to pass through and a second hole segment for accommodating the connecting flange after riveting;

[0011] The depth dimension of the second hole section is h, and 0≤b-h≤0.5 millimeter is satisfied.

[0012] In some embodiments, the diameter dimension of the connecting flange is f, the diameter dimension of the second hole section is g, and 0.1 millimeter≤g-f≤0.3 millimeter is satisfied.

[0013] In some embodiments, the width dimension of the riveting block is z, and 0.5 millimeter≤z-g≤20 millimeter is satisfied.

[0014] In some embodiments, the thickness dimension of the riveting block is c, the thickness dimension c≥1.5 millimeter is satisfied, and 1.5b≤c-h is satisfied.

[0015] In some embodiments, the first mounting through hole is a counter-sunk hole, and includes a third hole section and a fourth hole section located towards the riveting block from the third hole section, the depth dimension of the third hole section is e, and e≥c-h is satisfied.

[0016] In some embodiments, the distance dimension between the third hole section and the outer edge of the connecting flange is k, and k≥0.5 millimeter is satisfied.

[0017] In some embodiments, the cover plate body is provided with two first mounting through holes arranged at intervals, and the riveting block is provided with second mounting through holes corresponding to the first mounting through holes one by one.

[0018] The length dimension of the riveting block is y1, the distance dimension between the farthest ends of the second hole sections of the two second mounting through holes is y2, and 0.5 millimeter≤y1-y2≤20 millimeter is satisfied.

[0019] In some embodiments, the top cover of the battery cell further includes an upper insulating member, a lower insulating member, and a sealing member, the upper insulating member is sleeved on one side of the main body part close to the connecting flange, and is located between the riveting block and the cover plate body, the sealing member is sleeved on one side of the main body part close to the limiting part, and is located between the main body part and the cover plate body, and the lower insulating member is sleeved outside the sealing member, and is located between the limiting part and the cover plate body.

[0020] In another aspect, the embodiments of the present application provide a battery, which includes the top cover of the battery cell and a battery cell, and the top cover of the battery cell is connected with the battery cell through a pole. BRIEF DESCRIPTION OF DRAWINGS

[0021] FIG. 1 is a three-dimensional view of the top cover of the battery cell provided by the present application;

[0022] FIG. 2 is a top view of the top cover of the battery cell provided by the present application;

[0023] Fig. 3 is a sectional view of Fig. 2 along the direction of A-A;

[0024] Fig. 4 is an enlarged view of the structure of part B in Fig. 3;

[0025] Fig. 5 is a top view of the riveting block in the top cover of the battery cell provided by the present application;

[0026] Fig. 6 is a structural schematic view of the pole in the top cover of the battery cell provided by the present application;

[0027] Fig. 7 is a state diagram of the pole in the top cover of the battery cell provided by the present application when not riveted;

[0028] Fig. 8 is a state diagram of the pole in the top cover of the battery cell provided by the present application during riveting;

[0029] Fig. 9 is a structural schematic view of the battery provided by the present application.

[0030] In the drawings: 1, cover plate body; 11, first mounting through hole; 12, third hole section; 13, fourth hole section; 2, riveting block; 21, second mounting through hole; 22, first hole section; 23, second hole section; 3, pole; 31, limiting portion; 32, main body portion; 33, connecting flange; 34, recess; 4, upper insulating member; 5, lower insulating member; 6, sealing member; 100, top cover of battery cell; 200, battery cell; 300, battery. DETAILED DESCRIPTION

[0031] The present application will be described below in conjunction with the drawings and embodiments. The embodiments described herein are used to explain the present application. For ease of description, only the structures related to the present application are shown in the drawings.

[0032] In the description of the present application, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the meaning of the above terms in the present application can be understood as appropriate.

[0033] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can include that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or indicates that the first feature is lower in horizontal height than the second feature.

[0034] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation. In addition, the terms "first" and "second" are used to distinguish in description and have no special meaning.

[0035] At present, the top cover structure of the traditional blade cell is connected into one body by riveting process, and the riveting block, the pole and the aluminum sheet are connected into one body. The pole is provided with a flange for riveting, and the length of the flange determines the quality of riveting. When the length of the flange for riveting of the pole is short, the lower riveting block step is under greater stress, so the thickness of the riveting block needs to be increased, resulting in an increase in manufacturing cost. In addition, the short length of the flange also causes the riveting block to have the risk of being pulled off under the overall pulling force, so the gap between the pole and the riveting block needs to be strengthened by welding, thereby making the assembly process more complex and increasing the manufacturing cost.

[0036] Therefore, in order to simplify the assembly process and reduce the manufacturing cost, the present embodiment provides an electric cell top cover.

[0037] As shown in FIGS. 1-6, the electric cell top cover includes a cover plate body 1, a riveting block 2 and a pole 3. The cover plate body 1 is provided with a first mounting through hole 11. The riveting block 2 is arranged on one side of the cover plate body 1 and is provided with a second mounting through hole 21 in communication with the first mounting through hole 11. The pole 3 includes a limiting portion 31 and a main body portion 32. The limiting portion 31 abuts against one side of the cover plate body 1 away from the riveting block 2. The main body portion 32 is arranged in the first mounting through hole 11 and the second mounting through hole 21 and is provided with a recess 34 at one end away from the limiting portion 31, so as to form a connecting flange 33 riveted with the riveting block 2. The length of the connecting flange 33 is a, the thickness of the connecting flange 33 is b, a≥1 mm, b≥0.5 mm, and 1 mm≤a / b≤3 mm.

[0038] By making the length dimension a of the connecting flange 33 ≥1mm and the thickness dimension b ≥0.5mm, the connecting flange 33 has sufficient length and strength after riveting, so that not only the thickness of the riveting block 2 does not need to be increased, but also the process of welding reinforcement at the gap between the pole 3 and the riveting block 2 after riveting is omitted, thereby simplifying the assembly process, reducing the manufacturing cost, and making the length dimension a and the thickness dimension b of the connecting flange 33 satisfy 1mm≤a / b≤3mm, so that the connecting flange 33 has sufficient strength and is easy to deform and bend during riveting.

[0039] In the present embodiment, the limiting portion 31 and the main body portion 32 of the pole 3 have different diameter dimensions, and the diameter dimension of the limiting portion 31 is greater than that of the main body portion 32, thereby forming a stepped structure and constituting a step surface between the limiting portion 31 and the main body portion 32. When the pole 3 is assembled with the cover plate body 1, the step surface abuts against the side of the cover plate body 1 away from the riveting block 2, as shown in FIGS. 6 and 7, wherein before riveting, the connecting flange 33 is parallel to the main body portion 32 and perpendicular to the limiting portion 31. As shown in FIGS. 6 and 8, during riveting, the connecting flange 33 is forced to fold and gradually approach the riveting block 2. When riveting is completed, the connecting flange 33 is parallel to the limiting portion 31 and perpendicular to the main body portion 32, and the cover plate body 1 and the riveting block 2 are clamped between the connecting flange 33 and the limiting portion 31 of the pole 3, thereby forming an integral whole. The ratio of the length dimension a of the connecting flange 33 to the thickness dimension b of the connecting flange 33 can be any value within the range of 1mm≤a / b≤3mm or a range determined by any two values within the range, such as 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0040] Alternatively, as shown in FIGS. 4 and 5, the second mounting through hole 21 is a counterbore hole, including a first hole section 22 for the main body portion 32 to pass through and a second hole section 23 for accommodating the connecting flange 33 after riveting, and the depth dimension h of the second hole section 23 satisfies 0mm≤b-h≤0.5mm. By designing the second mounting through hole 21 as a counterbore hole and limiting the depth dimension h of the second hole section 23, so that the depth dimension h of the second hole section 23 satisfies 0mm≤b-h≤0.5mm, the thickness of the connecting flange 33 is slightly greater than the depth of the second hole section 23, which facilitates the connecting flange 33 to be pressed into place by the punch during riveting.

[0041] In the present embodiment, the difference between the thickness dimension b of the connecting flange 33 and the depth dimension h of the second hole section 23 can be any value within the range of 0mm≤b-h≤0.5mm or a range determined by any two values within the range, such as 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0042] Optionally, as shown in FIG. 4 and FIG. 5, the diameter size of the connecting flange 33 is f, the diameter size of the second hole section 23 is g, and 0.1mm≤g-f≤0.3mm is satisfied. By limiting the diameter size f of the connecting flange 33 and the diameter size g of the second hole section 23, the difference between the diameter size g of the second hole section 23 and the diameter size f of the connecting flange 33 satisfies 0.1mm≤g-f≤0.3mm, which on the one hand reserves space for the connecting flange 33 during riveting, so that the second hole section 23 can accommodate the connecting flange 33 after riveting, and on the other hand provides a support wall for the connecting flange 33 under pressure after riveting, so that the difference between the thickness size b of the connecting flange 33 and the depth size h of the second hole section 23 finally satisfies the range of 0mm≤b-h≤0.5mm, ensuring that the connecting flange 33 is pressed into place during punch riveting.

[0043] In the present embodiment, the difference between the diameter size g of the second hole section 23 and the diameter size f of the connecting flange 33 can be any value within the range of 0.1mm≤g-f≤0.3mm or a range determined by any two values within the range, such as 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc.

[0044] Optionally, as shown in FIG. 4 and FIG. 5, the width size of the riveting block 2 is z, and 0.5mm≤z-g≤20mm is satisfied. By limiting the width size z of the riveting block 2, the width size z of the riveting block 2 satisfies the range of 0.5mm≤z-g≤20mm, thereby ensuring that the riveting block 2 has sufficient boundary wall thickness in the width direction of the riveting block 2 after the second mounting through hole 21 is formed, and the boundary wall thickness is not less than 0.25mm, which supports the connecting flange 33, so that the connecting flange 33 is uniformly thick when it is pressed after being folded, and also avoids that the boundary wall thickness size is too large, resulting in that the size of the riveting block 2 is too large, thereby wasting materials.

[0045] In the present embodiment, the difference between the width size z of the riveting block 2 and the diameter size g of the second hole section 23 can be any value within the range of 0.5mm≤z-g≤20mm or a range determined by any two values within the range, such as 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc.

[0046] Optionally, as shown in FIG. 4, FIG. 5, the thickness dimension of the riveting block 2 is c, c≥1.5mm, and 1.5b≤c-h is satisfied. By limiting the thickness dimension c of the riveting block 2, the thickness dimension c of the riveting block 2 is≥1.5mm, and 1.5b≤c-h is satisfied, so that when the connecting flange 33 of the pole 3 is riveted, the riveting block 2 with the second mounting hole 21 has sufficient support strength to avoid structural collapse.

[0047] Optionally, as shown in FIG. 4, FIG. 5, the first mounting hole 11 is a countersunk hole, and includes a third hole section 12 and a fourth hole section 13 located towards the riveting block 2 from the third hole section 12, the depth dimension e of the third hole section 12, and e≥c-h is satisfied. By limiting the depth dimension e of the third hole section 12, the depth dimension e of the third hole section 12 satisfies e≥c-h, so that when the connecting flange 33 of the pole 3 is riveted, the cover plate body 1 has sufficient support strength to avoid deformation of the cover plate body 1 when the pressure is transmitted to the cover plate body 1 during riveting, resulting in structural warping. In this embodiment, the cover plate body 1 is an aluminum sheet.

[0048] Optionally, as shown in FIG. 4, FIG. 5, the distance between the inner edge of the third hole section 12 and the outer edge of the connecting flange 33 is k, and k≥0.5mm is satisfied. By limiting the distance dimension k between the inner edge of the third hole section 12 and the outer edge of the connecting flange 33, the distance dimension k satisfies k≥0.5mm, so that the cover plate body 1 and the connecting flange 33 have sufficient contact area, so that when the connecting flange 33 is riveted, the pressure is transmitted to the cover plate body 1, and the pressure can be effectively dispersed to avoid stress concentration, thereby improving the structural strength of the cover plate body 1 and avoiding deformation of the cover plate body 1 when the pressure is transmitted to the cover plate body 1 during riveting.

[0049] Optionally, as shown in FIG. 4, FIG. 5, the cover plate body 1 is provided with two first mounting holes spaced apart, the riveting block 2 is provided with a second mounting hole 21 corresponding to the first mounting hole, the length dimension of the riveting block 2 is y1, the distance dimension between the farthest ends of the second hole sections 23 of the two second mounting holes 21 is y2, and 0.5mm≤y1-y2≤20mm is satisfied. By limiting the difference between the length y1 of the riveting block 2 and the distance dimension y2 between the farthest ends of the second hole sections 23 of the two second mounting holes 21, it satisfies 0.5mm≤y1-y2≤20mm, so that after the two second mounting holes 21 are opened in the riveting block 2, there is sufficient boundary wall thickness in the length direction of the riveting block 2, and the boundary wall thickness is not less than 0.25mm, which supports the connecting flange 33, so that the connecting flange 33 is uniformly pressed after being folded, and also avoids that the boundary wall thickness dimension is too large, resulting in that the size of the riveting block 2 is too large, thereby wasting materials.

[0050] In the embodiment, the difference between the length y1 of the riveting block 2 and the distance y2 between the two second mounting through holes 21 and the farthest end of the second hole section 23 can be any value between 0.5 mm≤y1-y2≤20 mm or a range determined by any two values in the range, such as 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0051] Optionally, as shown in FIG. 4, the top cover of the battery cell further includes an upper insulating piece 4, a lower insulating piece 5, and a sealing piece 6. The upper insulating piece 4 is sleeved on one side of the main body 32 close to the connecting flange 33 and is located between the riveting block 2 and the cover body 1. The sealing piece 6 is sleeved on one side of the main body 32 close to the limiting portion 31 and is located between the main body 32 and the cover body 1. The lower insulating piece 5 is sleeved on the outside of the sealing piece 6 and is located between the limiting portion 31 and the cover body 1. By setting the upper insulating piece 4, the lower insulating piece 5, and the sealing piece 6, the top cover of the battery cell has good insulation, and the pole 3 is prevented from contacting the cover body 1 to cause short circuit.

[0052] In the embodiment, to verify the effectiveness of the various matching structure parameters of the top cover of the battery cell, 12 groups of top covers of battery cells with different structure parameters are selected for helium leak detection test. If the helium leak rate at the sealing ring is lower than 1×10 -7 pa·m 3 / s, the sealing property is good, and the product is qualified. If the helium leak rate at the sealing ring is higher than 1×10 -7 pa·m 3 / s, the sealing property is poor, and the product is unqualified. In order to ensure consistency with the working environment during the test, a test tool is clamped on the riveting block 2 during the helium leak detection test. The test tool transmits a force of 1000 Newton (N) and a torque of 6 Newton·millimeter (N·mm) to the riveting block 2, thereby simulating the stress condition of the riveting block 2 after being welded with a tab (a kind of metal sheet used for connection in battery application scenarios).

[0053] Table 1

[0054] In Table 1, OK indicates that the product is qualified, and NG indicates that the product is unqualified.

[0055] By comparing the experimental group 1#, the experimental group 2#, the experimental group 5#, the experimental group 6#, the experimental group 9# and the experimental group 10#, it can be known that, in the experimental group 1#, except that the length dimension a of the connecting flange 33 is 0.93mm, which is not within the range of the size requirement a≥1mm, other parameter dimensions are within the size requirement parameters, after the helium leak test, the helium leak rate is higher than 1×10 -7 pa·m 3 / s, the sealing performance is poor, and the product is unqualified, while in the experimental group 2#, the experimental group 5#, the experimental group 6#, the experimental group 9# and the experimental group 10#, not only other parameter dimensions are within the size requirement parameters, but also the length dimension a of the connecting flange 33 is within the range of a≥1mm, after the helium leak test, the helium leak rate is lower than 1×10 -7 pa·m 3 / s, the sealing performance is good, and the product is qualified.

[0056] Therefore, whether the length dimension a of the connecting flange 33 is within the range of a≥1mm plays an important role in the qualification and sealing performance of the product.

[0057] By comparing the experimental group 3#, the experimental group 2#, the experimental group 5#, the experimental group 6#, the experimental group 9# and the experimental group 10#, it can be known that, in the experimental group 3#, except that the thickness dimension b of the connecting flange 33 is 0.49mm, which is not within the range of the size requirement b≥0.5mm, other parameter dimensions are within the size requirement parameters, after the helium leak test, the helium leak rate is higher than 1×10 -7 pa·m 3 / s, the sealing performance is poor, and the product is unqualified, while in the experimental group 2#, the experimental group 5#, the experimental group 6#, the experimental group 9# and the experimental group 10#, not only other parameter dimensions are within the size requirement parameters, but also the thickness dimension b of the connecting flange 33 is within the range of b≥0.5mm, after the helium leak test, the helium leak rate is lower than 1×10 -7 pa·m 3 / s, the sealing performance is good, and the product is qualified.

[0058] Therefore, whether the thickness dimension b of the connecting flange 33 is within the range of b≥0.5mm plays an important role in the qualification and sealing performance of the product.

[0059] By comparing experimental group 4#, experimental group 2#, experimental group 5#, experimental group 6#, experimental group 9# and experimental group 10#, it can be known that in experimental group 4#, except that the difference between the thickness size c of the riveting block 2 and the depth size h of the second hole section 23 of the connecting flange 33 is 1.07 which is less than 1.5 times the thickness size b of the connecting flange 33 which is 1.2, not within the size requirement range of 1.5b≤c-h, other parameter sizes are within the size requirement range, after helium detection test, the helium detection leakage rate is higher than 1×10 -7 pa·m 3 / s, the sealing performance is poor, and the product is unqualified, while in experimental group 2#, experimental group 5#, experimental group 6#, experimental group 9# and experimental group 10#, not only other parameter sizes are within the size requirement range, but also the difference between the thickness size c of the riveting block 2 and the depth size h of the second hole section 23 of the connecting flange 33 is greater than 1.5 times the thickness size b of the connecting flange 33, which meets the size requirement range of 1.5b≤c-h, after helium detection test, the helium detection leakage rate is lower than 1×10 -7 pa·m 3 / s, the sealing performance is good, and the product is qualified.

[0060] Therefore, whether the difference between the thickness size c of the riveting block 2 and the depth size h of the second hole section 23 of the connecting flange 33 is greater than 1.5 times the thickness size b of the connecting flange 33 plays an important role in the qualification and sealing performance of the product.

[0061] By comparing experimental group 7#, experimental group 2#, experimental group 5#, experimental group 6#, experimental group 9# and experimental group 10#, it can be known that in experimental group 7#, except that the distance size k between the inner edge of the third hole section 12 and the outer edge of the connecting flange 33 is 0.48mm, which is not within the size requirement range of k≥0.5mm, other parameter sizes are within the size requirement range, after helium detection test, the helium detection leakage rate is higher than 1×10 -7 pa·m 3 / s, the sealing performance is poor, and the product is unqualified, while in experimental group 2#, experimental group 5#, experimental group 6#, experimental group 9# and experimental group 10#, not only other parameter sizes are within the size requirement range, but also the distance size k between the inner edge of the third hole section 12 and the outer edge of the connecting flange 33 is also within the range of k≥0.5mm, after helium detection test, the helium detection leakage rate is lower than 1×10 -7 pa·m 3 / s, the sealing performance is good, and the product is qualified.

[0062] Therefore, whether the distance size k between the inner edge of the third hole section 12 and the outer edge of the connecting flange 33 is within the range of k≥0.5mm plays an important role in the qualification and sealing performance of the product.

[0063] By comparing experimental group 8#, experimental group 2#, experimental group 5#, experimental group 6#, experimental group 9# and experimental group 10#, it can be known that in experimental group 8#, except that the depth size e of the third hole section 12 is 1.48mm, which is not within the range of the size requirement e≥c-h, the other parameter sizes are within the size requirement parameters, and after the helium leak test, the helium leak rate is higher than 1*10 -7 pa·m 3 / s, the sealing performance is poor, and the product is unqualified, while in experimental group 2#, experimental group 5#, experimental group 6#, experimental group 9# and experimental group 10#, not only the other parameter sizes are within the size requirement parameters, but also the depth size e of the third hole section 12 meets the range of the size requirement e≥c-h, and after the helium leak test, the helium leak rate is lower than 1*10 -7 pa·m 3 / s, the sealing performance is good, and the product is qualified.

[0064] Therefore, whether the depth size e of the third hole section 12 is within the range of e≥c-h has an important effect on the qualification and sealing performance of the product.

[0065] By observing experimental group 11# and experimental group 12#, it can be known that even if the values of the structure parameters of each matching are close to the lower limit of the range meeting the size requirement, after the helium leak test, the helium leak rate is still lower than 1*10 -7 pa·m 3 / s, the sealing performance is good, and the product is qualified.

[0066] Therefore, as long as each matching structure parameter is within the set range, the sealing performance of the product can be ensured to be good, and the product is qualified.

[0067] The embodiment also provides a battery, which comprises the battery cell top cover, and the battery improves the assembly efficiency, optimizes the overall structure size, and improves the assembly quality by applying the battery cell top cover.

[0068] In some embodiments, as shown in FIG. 9, the embodiment also provides a battery 300, which comprises a battery cell 200 and the battery cell top cover 100 described in any embodiment of the application, and the battery cell top cover 100 is connected with the battery cell 200 through the pole 3 to cooperatively realize current conduction.

Claims

1. A top cover of an electric cell, comprising: a cover plate body, the cover plate body being provided with a first mounting through hole; a riveting block, the riveting block being arranged on one side of the cover plate body and being provided with a second mounting through hole in communication with the first mounting through hole; a pole, the pole comprising a limiting portion and a main body portion, the limiting portion being in abutment with one side of the cover plate body away from the riveting block, the main body portion being arranged in the first mounting through hole and the second mounting through hole, and being provided with a groove at one end thereof away from the limiting portion, so as to form a connecting flange for riveting with the riveting block; a length dimension of the connecting flange is a, a thickness dimension of the connecting flange is b, the length dimension a is greater than or equal to 1 mm, the thickness dimension b is greater than or equal to 0.5 mm, and 1 mm≤a / b≤3 mm is satisfied.

2. The cell top cover of claim 1, wherein, the second mounting through hole is a counter-sunk hole, comprising a first hole section for the main body portion to pass through and a second hole section for accommodating the connecting flange after riveting; a depth dimension of the second hole section is h, and 0≤b-h≤0.5 mm is satisfied.

3. The cell top cover of claim 2, wherein, a diameter dimension of the connecting flange is f, a diameter dimension of the second hole section is g, and 0.1 mm≤g-f≤0.3 mm is satisfied.

4. The cell top cover of claim 3, wherein, a width dimension of the riveting block is z, and 0.5 mm≤z-g≤20 mm is satisfied.

5. The cell top cover of claim 2, wherein, a thickness dimension of the riveting block is c, the thickness dimension c is greater than or equal to 1.5 mm, and 1.5b≤c-h is satisfied.

6. The cell top cover of claim 5, wherein, the first mounting through hole is a counter-sunk hole, and comprises a third hole section and a fourth hole section located towards the riveting block from the third hole section, a depth dimension of the third hole section is e, and e≥c-h is satisfied.

7. The cell top cover of claim 6, wherein, a distance dimension between an inner edge of the third hole section and an outer edge of the connecting flange is k, and k≥0.5 mm is satisfied.

8. The cell top cover of claim 2, wherein, the cover plate body is provided with two first mounting through holes arranged at intervals, and the riveting block is provided with the second mounting through holes corresponding to the first mounting through holes one by one; a length dimension of the riveting block is y1, a distance dimension between the most distal ends of the second hole sections of the two second mounting through holes is y2, and 0.5 mm≤y1-y2≤20 mm is satisfied.

9. The top cover of the electric cell according to claim 1, further comprising an upper insulating member, a lower insulating member and a sealing member, the upper insulating member being sleeved on one side of the main body portion close to the connecting flange, and being located between the riveting block and the cover plate body, the sealing member being sleeved on one side of the main body portion close to the limiting portion, and being located between the main body portion and the cover plate body, and the lower insulating member being sleeved outside the sealing member, and being located between the limiting portion and the cover plate body.

10. A battery, comprising the top cover of the electric cell according to any one of claims 1-9 and an electric cell, the top cover of the electric cell being connected with the electric cell through the pole.

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