Battery end cap assembly, battery, and electric device

Abstract

The application discloses a battery end cover assembly, a battery and an electric device. The battery end cover assembly comprises a cover plate assembly, the cover plate assembly is provided with a plurality of first polarity connecting parts which are arranged at intervals; and a current collecting disc which is provided with a second polarity connecting part, the plurality of first polarity connecting parts are electrically connected with the second polarity connecting part, so that the electrical properties of the plurality of first polarity connecting parts are the same. Therefore, the current transmission channel can be increased, the resistance of the current in the battery can be reduced, the overcurrent capacity of the battery end cover assembly can be improved, the current conducting effect can be increased, and the rate performance of the battery can be improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery end cap assembly, a battery, and an electrical device. Background Technology

[0002] In the prior art, the cover plate of a cylindrical battery is generally provided with two terminals, one terminal connected to the positive terminal and the other terminal connected to the negative terminal. The terminal connected to the positive terminal is the positive terminal and the terminal connected to the negative terminal is the negative terminal. The cover plate of a cylindrical battery is generally provided with one positive terminal and one negative terminal. This reduces the current transmission channels, increases the resistance of current inside the battery, and causes the terminals of the cylindrical battery to have a weak overcurrent capacity. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a battery end cap assembly, which can increase the current transmission channel and reduce the current resistance inside the battery, thereby improving the current carrying capacity of the battery end cap assembly, increasing the current conduction effect, and also improving the rate performance of the battery.

[0004] The present invention further proposes a battery.

[0005] The present invention also proposes an electrical device.

[0006] According to a first aspect of the present invention, a battery end cap assembly includes: a cover plate assembly having a plurality of spaced-apart first polarity connection portions; and a current collector having a second polarity connection portion, wherein the plurality of first polarity connection portions are electrically connected to the second polarity connection portion so that the plurality of first polarity connection portions have the same electrical polarity.

[0007] According to some embodiments of the present invention, the orthographic projection area of ​​the plurality of first polarity connecting portions in the first direction is S1, and the orthographic projection area of ​​the cover plate assembly in the first direction is S2, S1:S2=(0.2-0.4):1, wherein S1 and S2 are in the same unit.

[0008] According to some embodiments of the present invention, on a first projection plane, the orthographic projections of a plurality of first polarity connection portions are located within the orthographic projections of the second polarity connection portions, and the first projection plane is perpendicular to a first direction.

[0009] According to some embodiments of the present invention, the projected area of ​​the second polarity connection in the first direction is S3, and the projected area of ​​the plurality of first polarity connections in the first direction is S4, where S3:S4=(0.8-1.5):1, and S3 and S4 are in the same unit.

[0010] According to some embodiments of the present invention, the projected area of ​​the second polarity connection in the first direction is S3, and the projected area of ​​the plurality of first polarity connections in the first direction is S4, where S3:S4=(1.01-1.3):1, and S3 and S4 are in the same unit.

[0011] According to some embodiments of the present invention, there are multiple second polarity connection portions, and multiple first polarity connection portions are correspondingly connected to multiple second polarity connection portions.

[0012] According to some embodiments of the present invention, the projected area of ​​each second polarity connection portion in the first direction is greater than the projected area of ​​the corresponding first polarity connection portion in the first direction.

[0013] According to some embodiments of the present invention, the current collector is provided with a cell connection portion, and the cell connection portion is spaced apart from the second polarity connection portion.

[0014] According to some embodiments of the present invention, there are multiple cell connection portions, and at least one cell connection portion is provided between two adjacent second polarity connection portions in the circumferential direction of the current collector.

[0015] According to some embodiments of the present invention, the second polarity connection portion is configured as a first protrusion protruding in a direction adjacent to the cover plate assembly, and the cell connection portion is configured as a second protrusion protruding in a direction away from the cover plate assembly.

[0016] According to some embodiments of the present invention, the protrusion height of the first protrusion is h1, the protrusion height of the second protrusion is h2, h1:h2=(2-60):1, wherein h1 and h2 are measured in the same unit.

[0017] According to some embodiments of the present invention, the cover plate assembly includes: Cover plate; Multiple poles are installed at intervals on the cover plate, and each pole is provided with the first polarity connection portion.

[0018] According to some embodiments of the present invention, the cover plate is formed with through holes; The pole includes: A first pole piece, the first pole piece passing through the through hole, the first pole piece includes a first side adjacent to the collector plate and a second side away from the collector plate, the first side is provided with the first polarity connection part; The second pole piece is connected to the second side of the first pole piece.

[0019] According to some embodiments of the present invention, the first pole piece includes: A connecting plate, wherein the connecting plate is configured as the first polarity connecting portion; A connecting cylinder, one end of which is connected to the connecting plate and passes through the through hole; A flange is connected to the end of the connecting cylinder away from the connecting plate, and the flange is connected to the second pole piece.

[0020] According to some embodiments of the present invention, the second pole body has an inner hole and a first stepped groove surrounding the inner hole, the connecting cylinder passes through the inner hole, and the flange is disposed in the first stepped groove.

[0021] According to some embodiments of the present invention, the cover plate assembly further includes: a first insulating seal disposed between the cover plate and the second pole piece and between the inner wall of the through hole and the outer wall of the connecting cylinder; and a second insulating seal disposed between the connecting plate and the cover plate and between the inner wall of the through hole and the outer wall of the connecting cylinder, the second insulating seal being connected to the first insulating seal and located on the side of the first insulating seal adjacent to the collector plate.

[0022] According to some embodiments of the present invention, the cover plate assembly further includes: a pole cap, wherein the second pole body has a second stepped groove formed on the side away from the first pole body, and the pole cap is disposed in the second stepped groove.

[0023] According to some embodiments of the present invention, the cover plate assembly includes: a cover plate having a plurality of first polarity connection portions.

[0024] According to some embodiments of the present invention, the cover plate is formed with a plurality of grooves, the bottom of the plurality of grooves being configured as the first polarity connection portion; the cover plate assembly further includes: an electrode cap, the cover plate being formed with a third stepped groove surrounding the grooves, and the electrode cap being disposed in the third stepped groove.

[0025] According to some embodiments of the present invention, there is a gap between the pole cap and the bottom of the groove.

[0026] According to some embodiments of the present invention, the gap has a dimension d in the first direction, and d satisfies the relationship: 0.1mm≤d≤1mm.

[0027] According to some embodiments of the present invention, on the second projection plane, the orthographic projection outer contours of a plurality of first polarity connection portions are symmetrically distributed about the center of the orthographic projection outer contour of the cover plate assembly, and the second projection plane is perpendicular to the first direction.

[0028] According to some embodiments of the present invention, the first polarity connection portion and the second polarity connection portion are connected by welding.

[0029] According to some embodiments of the present invention, the cover plate assembly includes an injection hole and an explosion-proof valve. On a third projection plane, the orthographic projection of the injection hole covers the center of the orthographic projection outer contour of the cover plate assembly, or the orthographic projection of the explosion-proof valve covers the center of the orthographic projection outer contour of the cover plate assembly. The third projection plane is perpendicular to the first direction.

[0030] According to a second aspect of the present invention, a battery includes: the battery end cap assembly described above; and further includes: a battery cell connected to the current collector; a housing, wherein the battery cell is disposed within the housing, and the cover plate assembly is disposed at at least one end of the housing.

[0031] An electrical device according to a third aspect of the present invention includes: the battery end cap assembly described above or the battery described above.

[0032] Compared with existing technologies, this electrical device can improve current carrying capacity, increase current conduction effect, improve battery rate performance, and avoid leakage problems caused by penetration welding, thereby improving the safety of the electrical device.

[0033] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a battery according to an embodiment of the present invention; Figure 2 yes Figure 1 A magnified view of region A in the middle; Figure 3 This is a schematic diagram of the structure of the cover plate assembly with an explosion-proof valve according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the cover plate assembly with injection holes according to an embodiment of the present invention; Figure 5 This is a cross-sectional view of a cover plate assembly with an explosion-proof valve according to an embodiment of the present invention; Figure 6 This is a cross-sectional view of the cover plate assembly with an injection hole according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a battery according to another embodiment of the present invention; Figure 8 yes Figure 7 A magnified view of region B in the middle; Figure 9This is a schematic diagram of the structure of the collector disk according to an embodiment of the present invention; Figure 10 This is a cross-sectional view of the manifold according to an embodiment of the present invention.

[0035] Figure label: 100. Battery; 10. Cover plate assembly; 11. First polarity connection part; 12. Cover plate; 13. Pole post; 131. First pole post body; 132. Second pole post body; 133. Connecting cylinder; 134. Flanged edge; 135. Inner hole; 136. First stepped groove; 137. Second stepped groove; 14. Through hole; 20. Current collector; 21. Second polarity connection part; 22. Cell connection part; 30. First insulating seal; 40. Second insulating seal; 50. Pole post cap; 60. Groove; 70. Third step groove; 80. Injection port; 90. Explosion-proof valve; 91. Battery cell; 92. Electrode welding surface. Detailed Implementation

[0036] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0037] The following is for reference. Figures 1-10 A battery end cap assembly according to an embodiment of the present invention is described.

[0038] Reference Figure 1 and Figure 2 As shown, the battery end cap assembly of the first aspect embodiment of the present invention includes: a cover plate assembly 10 and a current collector 20. The cover plate assembly 10 is provided with a plurality of spaced-apart first polarity connection portions 11, and the current collector 20 is provided with second polarity connection portions 21. The plurality of first polarity connection portions 11 are electrically connected to the second polarity connection portions 21, thereby making the electrical properties of the plurality of first polarity connection portions 11 the same.

[0039] Specifically, the cover of a traditional cylindrical battery typically has two terminals: one connected to the positive tab and the other to the negative tab. The terminal connected to the positive tab is the positive terminal, and the terminal connected to the negative tab is the negative terminal. Cylindrical batteries use one positive terminal and one negative terminal on each side, which reduces the current transmission channels and increases the resistance of current inside the battery, resulting in a weak overcurrent capacity of the cylindrical battery terminals.

[0040] Therefore, the structure of the battery 100 needs to be optimized. The cover assembly 10 in the battery 100 is provided with a plurality of spaced first polarity connection portions 11, which facilitates the electrical connection between the cover assembly 10 and the second polarity connection portion 21 of the current collector 20. The arrangement of multiple first polarity connection portions 11 can prevent short circuits in the electrical connection between the cover assembly 10 and the current collector 20, thereby further improving the stability of the electrical connection between the cover assembly 10 and the current collector 20.

[0041] Furthermore, the provision of the first polarity connection portion 11 of the cover plate assembly 10 and the second polarity connection portion 21 of the collector plate 20 can increase the contact area and connection strength between the cover plate assembly 10 and the collector plate 20.

[0042] Furthermore, each of the multiple first polarity connection portions 11 is electrically connected to the second polarity connection portion 21, thereby enabling the cover plate assembly 10 to form electrodes of the same polarity corresponding one-to-one with the multiple first polarity connection portions 11. That is, when the tab connected to the cell 91 at the current collector 20 is a positive tab, the second polarity connection portion 21 of the current collector 20 is electrically connected to the positive tab. This allows the first polarity connection portion 11 connected to the second polarity connection portion 21 to become positively charged, thereby enabling the cover plate assembly 10 to form a positive electrode corresponding to the first polarity connection portion 11. Since there are multiple first polarity connection portions 11, the cover plate assembly 10 can form multiple positive electrodes corresponding to the multiple first polarity connection portions 11.

[0043] Similarly, when the tab connected to the battery cell 91 at the current collector 20 is a negative tab, the second polarity connection portion 21 of the current collector 20 is electrically connected to the negative tab. This allows the first polarity connection portion 11 connected to the second polarity connection portion 21 to become negatively charged, thereby enabling the cover plate assembly 10 to form a negative electrode corresponding to the first polarity connection portion 11. Since there are multiple first polarity connection portions 11, the cover plate assembly 10 can form multiple negative electrodes corresponding to multiple first polarity connection portions 11.

[0044] Thus, the cover assembly 10 forms multiple electrodes of the same polarity corresponding to the multiple first polarity connection portions 11, which can increase the current transmission channel and thereby improve the overcurrent capability of the cover assembly 10 of the battery 100.

[0045] Therefore, the cover plate assembly 10 of the battery 100 forms electrodes of the same polarity that correspond one-to-one with the plurality of first polarity connection portions 11. This can increase the current transmission channel and reduce the resistance of current inside the battery 100, thereby improving the current carrying capacity of the battery end cover assembly, increasing the current guiding effect, and also improving the rate performance of the battery 100.

[0046] According to some embodiments of the present invention, such as Figure 5As shown, the projected area of ​​the plurality of first polarity connecting parts 11 in the first direction is S1, and the projected area of ​​the cover plate assembly 10 in the first direction is S2, S1:S2=(0.2-0.4):1, where S1 and S2 are measured in the same unit.

[0047] The first direction is the thickness direction of the first polarity connection 11. The projected area of ​​the multiple first polarity connection 11 in the first direction accounts for 20%-40% of the projected area of ​​the cover plate assembly 10, thereby improving the flow guiding effect of the first polarity connection 11.

[0048] According to some embodiments of the present invention, on the first projection plane, the orthographic projections of a plurality of first polarity connection portions 11 are located within the orthographic projection of the second polarity connection portion 21, and the first projection plane is perpendicular to the first direction. This allows for sufficient contact between the first polarity connection portion 11 and the second polarity connection portion 21, thereby further improving the stability of the electrical connection between the first polarity connection portion 11 and the second polarity connection portion 21.

[0049] According to a specific embodiment of the present invention, the projected area of ​​the second polarity connection 21 in the first direction is S3, and the projected area of ​​the plurality of first polarity connection parts 11 in the first direction is S4, S3:S4=(0.8-1.5):1, wherein S3 and S4 are in the same unit.

[0050] The projected area of ​​the second polarity connection 21 in the first direction accounts for 80%-150% of the projected area of ​​the plurality of first polarity connection parts 11 in the first direction. In this way, the contact area between the second polarity connection 21 and the plurality of first polarity connection parts 11 can be increased, thereby improving the flow guiding effect of the second polarity connection 21 and the plurality of first polarity connection parts 11.

[0051] According to some embodiments of the present invention, the projected area of ​​the second polarity connection in the first direction is S3, and the projected area of ​​the plurality of first polarity connections in the first direction is S4, where S3:S4=(1.01-1.3):1, and S3 and S4 are in the same unit.

[0052] The projected area of ​​the second polarity connection 21 in the first direction accounts for 101%-130% of the projected area of ​​the plurality of first polarity connection parts 11 in the first direction. This can further increase the contact area between the second polarity connection 21 and the plurality of first polarity connection parts 11, thereby further improving the flow guiding effect of the second polarity connection 21 and the plurality of first polarity connection parts 11.

[0053] According to some embodiments of the present invention, such as Figure 1 and Figure 2As shown, there are multiple second polarity connection portions 21, and multiple first polarity connection portions 11 are connected to multiple second polarity connection portions 21 in a one-to-one correspondence.

[0054] The second polarity connection portion 21 is provided corresponding to the first polarity connection portion 11, and the multiple first polarity connection portions 11 are connected to the multiple second polarity connection portions 21 in a one-to-one correspondence, thereby forming multiple current channels between the multiple first polarity connection portions 11 and the multiple second polarity connection portions 21.

[0055] According to some embodiments of the present invention, the projected area of ​​each second polarity connection portion 21 in the first direction is larger than the projected area of ​​the corresponding first polarity connection portion 11 in the first direction. This ensures that the first polarity connection portion 11 is sufficiently electrically connected to the second polarity connection portion 21, thereby increasing the current path.

[0056] According to some embodiments of the present invention, such as Figure 1 and Figure 9 As shown, the collector plate 20 is provided with a cell connection part 22, and the cell connection part 22 and a plurality of second polarity connection parts 21 are arranged at intervals in the circumferential direction of the collector plate 20.

[0057] The inclusion of the cell connection portion 22 in the current collector 20 facilitates the connection between the cell connection portion 22 and the cell 91, and also increases the contact area between the cell connection portion 22 and the cell 91, making the connection between the cell connection portion 22 and the cell 91 more stable, thereby improving the stability of the electrical connection between the current collector 20 and the cell 91.

[0058] Furthermore, the arrangement of multiple second polarity connection portions 21 on the current collector 20 can make the connection between the current collector 20 and the first polarity connection portion 11 more convenient and stable, and can also improve the current carrying capacity between the current collector 20 and the cover plate assembly 10.

[0059] According to some embodiments of the present invention, such as Figure 9 As shown, there are multiple cell connection portions 22. In the circumferential direction of the current collector 20, at least one cell connection portion 22 is provided between two adjacent second polarity connection portions 21.

[0060] When there are two second polarity connection parts 21 on the current collector 20, the two second polarity connection parts 21 are arranged at intervals relative to each other, and four battery cell connection parts 22 are arranged between the two second polarity connection parts 21. All four battery cell connection parts 22 are connected to the battery cell 91, thereby further ensuring the stability of the electrical connection between the battery cell 91 and the current collector 20.

[0061] According to a specific embodiment of the present invention, the second polarity connection portion 21 is configured as a first protrusion protruding in the direction adjacent to the cover plate assembly 10, and the cell connection portion 22 is configured as a second protrusion protruding in the direction away from the cover plate assembly 10.

[0062] Specifically, the second polarity connection portion 21 is constructed as a first protrusion protruding towards the adjacent cover plate assembly 10. The first protrusion is formed by stamping and partial drawing or bridging. This not only provides a buffering effect during the assembly of the cover plate assembly 10, but also, due to the gap between the first protrusion and the tab, facilitates rapid electrolyte wetting during the filling of the cell 91. Furthermore, this increases the strength and rigidity of the connection between the second polarity connection portion 21 and the cover plate assembly 10, ensuring a more secure and reliable connection between the cell 91 and the cover plate assembly 10. The first protrusion provides a larger contact area for the connection between the second polarity connection portion 21 and the cover plate assembly 10, increases the stability of the connection, reduces loosening, and thus improves the safety of the battery 100.

[0063] Furthermore, the cell connection portion 22 is configured as a second protrusion protruding in a direction away from the cover plate assembly 10. The second protrusion can provide a larger contact area for the connection between the current collector 20 and the cell 91, and can also increase the stability of the connection between the current collector 20 and the cell 91, and reduce loosening.

[0064] According to some embodiments of the present invention, the protrusion height of the first protrusion is h1, the protrusion height of the second protrusion is h2, h1:h2=(2-60):1, wherein h1 and h2 are measured in the same unit.

[0065] The height h1 of the first protrusion is designed to range from 0.2mm to 3.0mm, and the height h2 of the second protrusion is designed to range from 0.05mm to 0.4mm. h1 / h2=(2-60):1. h1 is used to buffer and absorb the tolerance of the structural components when the cover is closed, and h2 is used to locally compact and improve the fit of the welding surface 92 of the electrode ear.

[0066] According to some embodiments of the present invention, such as Figure 9 As shown, the cell connection portion 22 is fan-shaped or elongated on the current collector 20, and / or the second polarity connection portion 21 is trapezoidal, rectangular, fan-shaped or elongated on the current collector 20.

[0067] The cell connection part 22 is arranged in a fan shape or a strip shape on the current collector 20, which can increase the rigidity of the current collector 20 and also facilitate the contact between the cell connection part 22 and the electrode welding surface 92.

[0068] Similarly, the second polarity connection 21 is arranged in a trapezoidal, rectangular, fan-shaped or elongated shape on the collector plate 20, which can further increase the rigidity of the collector plate 20, make the force on the second polarity connection 21 more uniform, and reduce the accumulation of heat in the second polarity connection 21.

[0069] According to some embodiments of the present invention, such as Figure 3 As shown, the cover plate assembly 10 includes a cover plate 12 and a plurality of pole posts 13, which are spaced apart and installed on the cover plate 12. Each pole post 13 is provided with a first polarity connection portion 11.

[0070] The cover plate 12 can be provided with two pole posts 13, which are spaced apart on the cover plate 12. Since each pole post 13 is provided with a first polarity connection part 11, which is connected to the current collector 20, it is easy for the two pole posts 13 to form a pole post 13 of the same polarity, thereby improving the current flow capacity at the cover plate 12.

[0071] According to some embodiments of the present invention, such as Figure 2 and Figure 3 As shown, the cover plate 12 has a through hole 14, and the pole post 13 includes a first pole post 131 and a second pole post 132. The first pole post 131 includes a first side adjacent to the current collector 20 and a second side away from the current collector 20. The first pole post 131 is provided with a first polarity connection part 11, and the second pole post 132 is connected to the second side of the first pole post 131.

[0072] The cover plate 12 is provided with a through hole 14, which facilitates the installation of the pole post 13. Moreover, the pole post 13 is mainly composed of a first pole post 131 and a second pole post 132. The first pole post 131 is provided with a through hole 14, which facilitates the connection between the first pole post 131 and the collector plate 20.

[0073] Furthermore, one end of the first pole post 131 is located on the side of the cover plate 12 adjacent to the collector plate 20. The first pole post 131 is provided with a first polarity connection part 11. The first pole post 131 is connected to the collector plate 20 through the first polarity connection part 11. In this way, the stability of the connection between the first pole post 131 and the collector plate 20 can be improved.

[0074] Furthermore, the second pole piece 132 is located on the side of the cover plate 12 away from the collector plate 20. The second pole piece 132 is connected to the second side of the first pole piece 131. This facilitates the installation of the pole piece 13, reduces the impact of heat on the collector plate 20, and reduces the accumulation of heat in the connection area between the first polarity connection part 11 and the collector plate 20.

[0075] According to specific embodiments of the present invention, such as Figure 5As shown, the first pole post 131 includes a connecting plate, a connecting cylinder 133 and a flange 134. The connecting plate is configured as a first polarity connecting part 11. One end of the connecting cylinder 133 is connected to the connecting plate, and the connecting cylinder 133 is provided with a through hole 14. The flange 134 is connected to the end of the connecting cylinder 133 away from the connecting plate, and the flange 134 is connected to the second pole post 132.

[0076] Specifically, the first polarity connection part 11 is a connecting plate, which can facilitate the connection between the first pole post 131 and the collector plate 20, and can also increase the contact area between the connecting plate and the collector plate 20.

[0077] Furthermore, the connection cylinder 133 facilitates the connection between the first pole piece 131 and the second pole piece 132. Moreover, the middle part of the connection cylinder 133 is hollow, which facilitates through welding of the connection plate from the outside.

[0078] Furthermore, the flange 134 can increase the strength of the connection between the first pole piece 131 and the second pole piece 132, provide a more secure connection, and ensure the stability and reliability of the connection between the first pole piece 131 and the second pole piece 132, thereby reducing the risk of failure caused by loosening of the connection between the first pole piece 131 and the second pole piece 132.

[0079] According to some embodiments of the present invention, such as Figure 5 As shown, the second pole body 132 has an inner hole 135 and a first stepped groove 136 surrounding the inner hole 135. The connecting cylinder 133 passes through the inner hole 135, and the flange 134 is disposed in the first stepped groove 136.

[0080] The second pole post 132 has an inner hole 135, which facilitates the insertion of the connecting cylinder 133. The second pole post 132 also has a first stepped groove 136, and the flange 134 is connected to the first stepped groove 136, thereby increasing the contact area between the flange 134 and the first stepped groove 136 and increasing the connection strength between the flange 134 and the first stepped groove 136.

[0081] According to some embodiments of the present invention, such as Figure 5 As shown, the cover plate assembly 10 further includes: a first insulating seal 30 and a second insulating seal 40. The first insulating seal 30 abuts between the cover plate 12 and the second pole post 132, and abuts between the inner wall of the through hole 14 and the outer wall of the connecting cylinder 133. The second insulating seal 40 abuts between the connecting plate and the cover plate 12, and abuts between the inner wall of the through hole 14 and the outer wall of the connecting cylinder 133. The second insulating seal 40 is connected to the first insulating seal 30 and is located on the side of the first insulating seal 30 adjacent to the collector plate 20.

[0082] A first insulating seal 30 and a second insulating seal 40 are provided between the first pole piece 131 and the second pole piece 132. The first insulating seal 30 abuts against the cover plate 12 and the second pole piece 132, which can insulate and seal the cover plate 12 and the second pole piece 132, thereby preventing the current from flowing from the second pole piece 132 to the cover plate 12.

[0083] Furthermore, the first insulating seal 30 abuts between the inner wall of the through hole 14 and the outer wall of the connecting cylinder 133, thereby preventing the current from flowing from the connecting cylinder 133 to the cover plate 12.

[0084] Furthermore, the second insulating seal 40 abuts between the connecting plate and the cover plate 12, which can prevent electrolyte from appearing between the connecting plate and the cover plate 12, thereby ensuring the sealing between the connecting plate and the cover plate 12.

[0085] Furthermore, the second insulating seal 40 abuts against the inner wall of the through hole 14 and the outer wall of the connecting cylinder 133, which increases the sealing between the inner wall of the through hole 14 and the outer wall of the connecting cylinder 133, thereby preventing electrolyte from flowing to the cover plate 12. Moreover, the second insulating seal 40 is located on the side of the first insulating seal 30 adjacent to the current collector 20, thus further improving the sealing between the first insulating seal 30 and the current collector 20, thereby ensuring the safety of the inside of the battery 100.

[0086] According to some embodiments of the present invention, such as Figure 5 As shown, the cover plate assembly 10 also includes: pole post cover 50, the second pole post 132 has a second stepped groove 137 formed on the side away from the first pole post 131, and the pole post cover 50 is disposed in the second stepped groove 137.

[0087] The terminal cap 50 further prevents leakage from weld holes caused by through-welding of the terminal 13. The terminal cap 50 can further seal the weld, thereby improving the reliability of the terminal 13. During welding of the terminal 13, the corresponding welding position is first identified by a CCD camera and the terminal cap 50 is closed before through-welding is performed on the outside of the cell 91, which simplifies the welding difficulty of the cell 91.

[0088] Furthermore, the second pole piece 132 has a second stepped groove 137, which facilitates the insertion of the pole piece cap 50 into the second stepped groove 137, thereby enabling the pole piece cap 50 to further perform the function of sealing. Moreover, the pole piece cap 50 is compressed and fitted to the bottom of the second stepped groove 137, and after welding, the connection and flow guidance are performed by external penetration welding.

[0089] According to some embodiments of the present invention, the pole post 13 is annular, rectangular, fan-shaped, arc-shaped or circular.

[0090] Among them, the pole 13 is arranged in a ring, rectangle, fan shape, arc or circle, which can better adapt to different scenario requirements and can also change the current distribution at the pole 13.

[0091] According to another embodiment of the invention, such as Figure 7 and Figure 8 As shown, the cover plate assembly 10 includes a cover plate 12, which is provided with a plurality of first polarity connecting portions 11.

[0092] The cover plate 12 is provided with a plurality of first polarity connection parts 11, which facilitates the connection between the first polarity connection parts 11 and the collector plate 20, thereby making the connection between the cover plate 12 and the collector plate 20 more stable.

[0093] According to specific embodiments of the present invention, such as Figure 7 and Figure 8 As shown, the cover plate 12 has a plurality of grooves 60, the bottom of the plurality of grooves 60 is constructed as a first polarity connection part 11, and the cover plate assembly 10 also includes: pole post cover 50, the cover plate 12 has a third step groove 70 surrounding the grooves 60, and the pole post cover 50 is disposed in the third step groove 70.

[0094] Specifically, the cover plate 12 has multiple grooves 60, which allows the cover plate 12 to form multiple first polarity connection parts 11, thereby facilitating the connection of the cover plate 12 with the collector plate 20 through the first polarity connection parts 11.

[0095] Furthermore, the pole cap 50 is embedded into the third step groove 70, which allows the pole cap 50 to further perform the function of sealing and plugging.

[0096] According to some embodiments of the present invention, a gap exists between the pole cap 50 and the bottom of the groove 60. Thus, it is possible to... To prevent weld scars at groove 60 from protruding and pressing against pole cap 50, and to ensure the consistency of pole cap 50 assembly position.

[0097] According to a specific embodiment of the present invention, the dimension of the gap in the first direction is d, and d satisfies the relationship: 0.1mm≤d≤1mm.

[0098] The gap is in the range of 0.1mm-1.0mm, which can prevent the weld scar at the groove 60 from protruding and pressing against the pole cap 50, and can also ensure the consistency of the assembly position of the pole cap 50.

[0099] According to some embodiments of the present invention, the first polarity connection portion 11 and the second polarity connection portion 21 are connected by welding. In this way, the connection between the first polarity connection portion 11 and the second polarity connection portion 21 can be made more stable and firm.

[0100] According to some embodiments of the present invention, on the second projection plane, the orthographic projection outer contours of a plurality of first polarity connection portions 11 are symmetrically distributed about the center of the orthographic projection outer contour of the cover plate assembly 10, and the second projection plane is perpendicular to the first direction. This not only increases the current-carrying capacity of the cover plate assembly 10, but also makes the current at the cover plate assembly 10 more uniform.

[0101] According to some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the cover plate assembly 10 includes an injection hole 80 and an explosion-proof valve 90. On the third projection plane, the orthographic projection of the injection hole 80 covers the center of the orthographic projection outer contour of the cover plate assembly 10, or the orthographic projection of the explosion-proof valve 90 covers the center of the orthographic projection outer contour of the cover plate assembly 10. The third projection plane is perpendicular to the first direction.

[0102] When the internal pressure of the battery cell 91 is too high, the explosion-proof valve 90 is opened to release the pressure, thereby preventing the battery 100 from exploding. The explosion-proof valve 90 can be ring-shaped, rectangular, or circular, and can be set according to the actual situation.

[0103] Furthermore, the explosion-proof valve 90 is positioned opposite to the winding hole of the battery cell 91, and the explosion-proof valve 90 and the winding hole of the battery cell 91 are on the same central axis. When a short circuit occurs inside the battery 100 and a fire breaks out, it can facilitate the removal of gas more effectively than the offset explosion-proof valve 90, thereby improving the safety of the battery 100.

[0104] Furthermore, the injection hole 80 is located at the center of the cover plate assembly 10, which simplifies the positioning difficulty of injecting liquid into the battery 100.

[0105] The battery cell 91 is connected to the current collector 20 to facilitate the transmission of current. The battery cell 91 is located inside the housing, and the housing protects the battery cell 91. The cover plate assembly 10 can be set at both ends of the housing, so as to facilitate the formation of a current flow path inside the battery cell 91.

[0106] According to a second aspect of the present invention, a battery 100 includes: the end cap assembly described above, and further includes: a battery cell 91 and a housing, wherein the battery cell 91 is connected to a current collector 20, the battery cell 91 is disposed within the housing, and the cover plate assembly 10 is disposed at at least one end of the housing.

[0107] The cover assembly 10 in the battery 100 can be used for steel-cased cylindrical batteries or rectangular batteries.

[0108] According to a third aspect of the present invention, an electrical device includes: the end cap assembly of the above embodiments or the battery 100 of the above embodiments.

[0109] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0110] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0111] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery end cap assembly, characterized in that, include: Cover plate assembly (10), the cover plate assembly (10) is provided with a plurality of spaced first polarity connecting parts (11); The current collector (20) is provided with a second polarity connection part (21) and a cell connection part (22). A plurality of first polarity connection parts (11) are electrically connected to the second polarity connection part (21) so that the electrical properties of the plurality of first polarity connection parts (11) are the same. The cell connection portion (22) and the second polarity connection portion (21) are spaced apart; There are multiple battery cell connection parts (22). In the circumferential direction of the current collector (20), at least one battery cell connection part (22) is provided between two adjacent second polarity connection parts (21). The second polarity connection portion (21) is configured as a first protrusion protruding in a direction adjacent to the cover plate assembly (10), and the cell connection portion (22) is configured as a second protrusion protruding in a direction away from the cover plate assembly (10); The protrusion height of the first protrusion is h1, and the protrusion height of the second protrusion is h2, h1:h2=(2-60):1, where h1 and h2 are measured in the same unit; On the second projection plane, the orthographic projection outer contours of a plurality of the first polarity connection portions (11) are symmetrically distributed about the center of the orthographic projection outer contour of the cover plate assembly (10), and the second projection plane is perpendicular to the first direction; There are multiple second polarity connection portions (21), and multiple first polarity connection portions (11) are connected to multiple second polarity connection portions (21) respectively. The projected area of ​​each second polarity connection portion (21) in the first direction is greater than the projected area of ​​the corresponding first polarity connection portion (11) in the first direction.

2. The battery end cap assembly according to claim 1, characterized in that, The projected area of ​​the plurality of first polarity connection portions (11) in the first direction is S1, and the projected area of ​​the cover plate assembly (10) in the first direction is S2, S1:S2=(0.2-0.4):1, wherein S1 and S2 are in the same unit.

3. The battery end cap assembly according to claim 1, characterized in that, On the first projection plane, the orthographic projections of the plurality of first polarity connection portions (11) are located within the orthographic projection of the second polarity connection portion (21), and the first projection plane is perpendicular to the first direction.

4. The battery end cap assembly according to claim 1, characterized in that, The projected area of ​​the second polarity connection part (21) in the first direction is S3, and the projected area of ​​the plurality of first polarity connection parts (11) in the first direction is S4, S3:S4=(0.8-1.5):1, where S3 and S4 are in the same unit.

5. The battery end cap assembly according to claim 1, characterized in that, The projected area of ​​the second polarity connection part (21) in the first direction is S3, and the projected area of ​​the plurality of first polarity connection parts (11) in the first direction is S4, S3:S4=(1.01-1.3):1, where S3 and S4 are in the same unit.

6. The battery end cap assembly according to claim 1, characterized in that, The cover plate assembly (10) includes: Cover plate (12); Multiple pole posts (13) are installed at intervals on the cover plate (12), and each pole post (13) is provided with the first polarity connection part (11).

7. The battery end cap assembly according to claim 6, characterized in that, The cover plate (12) has a through hole (14); The pole (13) includes: The first pole post (131) passes through the through hole (14). The first pole post (131) includes a first side adjacent to the collector plate (20) and a second side away from the collector plate (20). The first side is provided with the first polarity connection part (11). The second pole piece (132) is connected to the second side of the first pole piece (131).

8. The battery end cap assembly according to claim 7, characterized in that, The first pole piece (131) includes: A connecting plate, wherein the connecting plate is configured as the first polarity connecting part (11). Connecting cylinder (133), one end of which is connected to the connecting plate and passes through the through hole (14). A flange (134) is connected to the end of the connecting cylinder (133) away from the connecting plate, and the flange (134) is connected to the second pole piece (132).

9. The battery end cap assembly according to claim 8, characterized in that, The second pole post (132) has an inner hole (135) and a first stepped groove (136) arranged around the inner hole (135). The connecting cylinder (133) passes through the inner hole (135), and the flange (134) is arranged in the first stepped groove (136).

10. The battery end cap assembly according to claim 9, characterized in that, The cover plate assembly (10) also includes: The first insulating seal (30) is disposed between the cover plate (12) and the second pole post (132) and between the inner wall of the through hole (14) and the outer wall of the connecting cylinder (133); The second insulating seal (40) is disposed between the connecting plate and the cover plate (12) and between the inner wall of the through hole (14) and the outer wall of the connecting cylinder (133). The second insulating seal (40) is connected to the first insulating seal (30) and is located on the side of the first insulating seal (30) adjacent to the manifold (20).

11. The battery end cap assembly according to claim 10, characterized in that, The cover plate assembly (10) also includes: The pole cap (50) and the second pole body (132) have a second stepped groove (137) formed on the side away from the first pole body (131), and the pole cap (50) is disposed in the second stepped groove (137).

12. The battery end cap assembly according to claim 1, characterized in that, The cover plate assembly (10) includes: The cover plate (12) is provided with a plurality of first polarity connection portions (11).

13. The battery end cap assembly according to claim 12, characterized in that, The cover plate (12) has a plurality of grooves (60), and the bottom of the plurality of grooves (60) is constructed as the first polar connection part (11). The cover plate assembly (10) also includes: The pole cap (50) has a cover plate (12) forming a third stepped groove (70) around the groove (60), and the pole cap (50) is disposed in the third stepped groove (70).

14. The battery end cap assembly according to claim 13, characterized in that, There is a gap between the pole cap (50) and the bottom of the groove (60).

15. The battery end cap assembly according to claim 14, characterized in that, The gap has a dimension d in the first direction, and d satisfies the relationship: 0.1mm≤d≤1mm.

16. The battery end cap assembly according to any one of claims 1-15, characterized in that, The first polarity connection portion (11) and the second polarity connection portion (21) are connected by welding.

17. The battery end cap assembly according to any one of claims 1-15, characterized in that, The cover plate assembly (10) includes an injection hole (80) and an explosion-proof valve (90). On the third projection plane, the orthographic projection of the injection hole (80) covers the center of the orthographic projection outer contour of the cover plate assembly (10), or the orthographic projection of the explosion-proof valve (90) covers the center of the orthographic projection outer contour of the cover plate assembly (10). The third projection plane is perpendicular to the first direction.

18. A battery, characterized in that, include: Battery end cap assembly as described in any one of claims 1-17; Also includes: Battery cell (91), wherein the battery cell (91) is connected to the current collector (20); The housing, the battery cell (91) is disposed inside the housing, and the cover assembly (10) is disposed at at least one end of the housing.

19. An electrical appliance, characterized in that, include: The battery end cap assembly according to any one of claims 1-17 or the battery according to claim 18.

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