Battery cell cover plate assembly, battery cell and battery pack

Abstract

The present invention relates to the technical field of batteries, and discloses a battery cell cover plate assembly, a battery cell and a battery pack, the battery cell cover plate assembly comprises a cover plate, and the cover plate is provided with a first through hole; the pole is mounted in the first through hole, the pole comprises a pole body and a first connecting part arranged at the bottom of the pole body, and a first flange is arranged on the peripheral wall of the first connecting part; the first insulating part is arranged on the first flange in a sleeving mode and abuts against the peripheral wall of the first connecting part; and the sealing ring is arranged on the column body in a sleeving mode and abuts against the column body, the first connecting part, the first insulating part and the cover plate, and the sealing ring covers the abutting position of the first insulating part and the first connecting part. The pole provided by the invention is simple to form, and the forming efficiency of the pole is improved; and the sealing ring covers the abutting part of the first insulating part and the first connecting part, so that the condition that the copper layer and the aluminum layer of the post terminal fall off due to corrosion of an aluminum material below the abutting part of the first insulating part and the first connecting part is prevented, and the electrical safety of the battery cell is improved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery cover assembly, a battery cell and a battery pack. Background Art

[0002] As new energy battery technology becomes increasingly mature, new energy batteries are widely used as power batteries in electric vehicles and energy storage fields, and the performance requirements for new energy batteries are increasing.

[0003] In related technologies, new energy batteries are composed of multiple battery cells, and the battery cells generally include a cover assembly, an electrode group and a shell. Currently, the pole of the negative terminal in the cover assembly is complex to form, and the copper layer and the aluminum layer of the pole are easy to fall off, which makes the battery cell unable to be used normally. Summary of the Invention

[0004] In view of this, the present invention provides a battery cover assembly, a battery cell and a battery pack to solve the problem of easy detachment between the copper layer and the aluminum layer of the pole.

[0005] In a first aspect, the present invention provides a battery cell cover assembly, comprising:

[0006] a cover plate, wherein a first through hole is provided on the cover plate;

[0007] A pole, installed in the first through hole, the pole comprising a column and a first connecting portion provided at the bottom of the column, a first flange being provided on an outer peripheral wall of the first connecting portion;

[0008] a first insulating member, sleeved on the first flange and abutting against the outer peripheral wall of the first connecting portion;

[0009] A sealing ring is sleeved on the column and respectively abuts against the column, the first connecting portion, the first insulating member and the cover plate. The sealing ring covers the abutment portion between the first insulating member and the first connecting portion.

[0010] Beneficial Effects: A first connecting portion is provided at the bottom of the pole body, a first flange is provided on the outer peripheral wall of the first connecting portion, and then a first insulating member is sleeved onto the first flange; a sealing ring is further sleeved onto the main body, so that the sealing ring abuts against the pole body, the first connecting portion, the first insulating member, and the cover plate, respectively, and the sealing ring covers the abutment between the first insulating member and the first connecting portion, thereby preventing the aluminum material below the abutment between the first insulating member and the first connecting portion from corroding and causing the copper layer and aluminum layer of the pole to fall off, thereby improving the electrical safety of the battery cell. Moreover, the pole provided by the present invention has a pole body and a first connecting portion integrally formed, which is simple to form and can effectively improve the forming efficiency of the pole.

[0011] In an optional embodiment, the distance a between the outer peripheral edge of the sealing ring and the abutment point between the first insulating member and the first connecting portion satisfies 0.5 mm ≤ a ≤ 2 mm.

[0012] In an optional embodiment, a distance h from a lower surface of the first connecting portion to a lower surface of the first insulating member satisfies 0.2 mm ≤ h ≤ 1 mm.

[0013] In an optional embodiment, the first connecting portion includes an aluminum portion and a copper portion, the aluminum portion is fixedly connected to the column, and the copper portion is fixedly connected to the aluminum portion and is located at an end away from the column;

[0014] The first insulating member is provided with a groove extending from an end surface of the first insulating member in a direction away from the first connecting portion. The first flange is installed in the groove and abuts against an inner wall of the groove.

[0015] In an optional embodiment, the groove wall thickness L1 satisfies 0.2mm≤L1≤3mm; the thickness L3 of the copper part on the first flange satisfies 0.5mm≤L3≤3mm, and the depth of the groove is L2, 2mm≤L1+L2+L3≤12mm.

[0016] In an optional embodiment, the method further includes:

[0017] An upper plastic ring is sleeved on the pole, and the upper plastic ring comprises a plastic ring body and a first ring body arranged on the outer periphery of the plastic ring body;

[0018] A connecting piece is abutted against the plastic ring body and is arranged in the first ring body. The connecting piece is connected to the pole.

[0019] In an optional embodiment, the pole further includes a second connecting portion provided on the top of the column body, the second connecting portion is provided with a second flange, the connecting member is provided with a limiting step, and the second flange abuts against the limiting step.

[0020] In an optional embodiment, a second insulating member is further included, abutting between the cover plate and the first insulating member; a second through hole corresponding to the first through hole is provided on the second insulating member, and the pole is installed in the second through hole.

[0021] In a second aspect, the present invention further provides a battery cell, comprising:

[0022] The battery cell cover assembly as described above;

[0023] A housing having a receiving cavity and an opening communicating with the receiving cavity, wherein the cell cover assembly covers the opening;

[0024] The pole group is arranged in the accommodating cavity, and the pole group is provided with a pole ear, and the pole ear is electrically connected to the pole column.

[0025] Beneficial effects: The battery cell shell and the battery cell cover assembly form a closed space that can effectively protect the electrode group and other internal components from external physical damage, such as collisions and extrusions. It can also prevent dust, moisture, and other impurities from entering the accommodating cavity, avoiding affecting the normal operation of the battery cell and reducing the probability of faults such as short circuits and corrosion. The electrode group is placed in the accommodating cavity and then sealed with the cover assembly. This assembly method is simple and efficient, and the cover can be opened relatively conveniently for maintenance or replacement of internal components. By electrically connecting the tabs to the poles, the intermediate links and resistance of current transmission are reduced, allowing current to flow more quickly and efficiently between the electrode group and the external circuit, thereby improving the charge and discharge performance of the battery cell.

[0026] In a third aspect, the present invention further provides a battery pack, comprising: a box body and a plurality of battery cells as described above, wherein the plurality of battery cells are accommodated in the box body.

[0027] Beneficial effects: The battery pack also includes a box body, which accommodates multiple battery cells. The box body can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells; and by arranging multiple battery cells in the box body of the battery pack, the overall energy density of the battery pack can be improved, and the performance of the battery pack can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A three-dimensional diagram of a battery cover assembly according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 A top view of the cell cover assembly shown;

[0031] Figure 3 for Figure 2 Cross-sectional view along AA direction;

[0032] Figure 4 for Figure 3 A partial enlarged schematic diagram of B in the middle;

[0033] Figure 5This is an exploded view of a battery cell cover assembly according to an embodiment of the present invention;

[0034] Figure 6 This is a partial schematic diagram of a battery cell cover assembly according to another embodiment of the present invention;

[0035] Figure 7 This is a three-dimensional diagram of a battery cell cover assembly according to another embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 100. Battery cell cover assembly; 110. Cover; 111. First through hole; 120. Pole; 121. Column; 122. First connecting portion; 1221. First flange; 1222. Aluminum portion; 1223. Copper portion; 123. Second connecting portion; 1231. Second flange; 130. First insulating member; 131. Groove; 132. Groove wall; 140. Sealing ring; 141. Sealing ring body; 142. Third ring body; 150. Second insulating member; 151. Second through hole; 160. Upper plastic ring; 161. Plastic ring body; 162. First ring body; 163. Third through hole; 170. Connector; 171. Limiting step. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0039] The following combination Figures 1 to 7 , describing embodiments of the present invention.

[0040] According to an embodiment of the present invention, on the one hand, referring to Figures 1 to 5 , provides a battery cell cover assembly 100, including: a cover 110, a first through hole 111 is provided on the cover 110; a pole 120, installed in the first through hole 111, the pole 120 includes a column 121 and a first connecting part 122 arranged at the bottom of the column 121, and a first flange 1221 is provided on the outer peripheral wall of the first connecting part 122; a first insulating member 130, sleeved on the first flange 1221, and abutted against the outer peripheral wall of the first connecting part 122; a sealing ring 140, sleeved on the column 121, and abutted against the column 121, the first connecting part 122, the first insulating member 130 and the cover 110 respectively, and the sealing ring 140 covers the abutment between the first insulating member 130 and the first connecting part 122.

[0041] In this embodiment, the cover plate 110 can be a plain aluminum plate. By opening a first through hole 111 in the middle of the plain aluminum plate, wherein the shape of the first through hole 111 can be circular, and by reasonably setting the position of the first through hole 111, during the process of assembling the components on the cover plate 110, the operator can more clearly distinguish the purpose of the through holes in different positions, thereby improving assembly efficiency. It can also facilitate the operator to quickly locate and handle problems related to specific through holes during maintenance, and can also maintain the structural strength of the cover plate 110 to the greatest extent while ensuring the functions of other components on the cover plate 110. The pole 120 is a conductive interface connecting the battery cell to the external circuit, responsible for current input or output, and the negative pole 120 and the positive pole 120 together constitute the external electrical interface of the battery cell. The pole 120 in this embodiment can be a negative pole 120, which is a conductive connection terminal of the negative pole of the battery cell, responsible for conducting the current inside the battery cell to the external circuit. The negative electrode post 120 is installed in the first through hole 111. The shape of the post 120 is a circular body that matches the shape of the first through hole 111. The shapes of the first through hole 111 and the post 120 can be any shape and are not limited to circular. The specific shape can be selected according to actual usage requirements.

[0042] Furthermore, the pole 120 includes a column 121 and a first connecting portion 122 disposed at the bottom of the column 121. The pole 120 can be formed by cold heading. The pole 120 comprises the column 121 and the first connecting portion 122 disposed at the bottom of the column 121. The diameter of the first connecting portion 122 is larger than the diameter of the column 121. This allows the sealing ring 140 to abut against the upper surfaces of the column 121 and the first connecting portion 122 when mounted on the pole 120. A first flange 1221 is provided on the outer peripheral wall of the first connecting portion 122, extending from the outer peripheral wall end surface of the first connecting portion 122 in a direction away from the first connecting portion 122. A first insulating member 130 is mounted on the first flange 1221 and abuts against the outer peripheral wall end surface of the first connecting portion 122, such that the first insulating member 130 covers the first flange 1221. The first insulating member 130 can be integrated with the pole 120 by integral injection molding.

[0043] Furthermore, the sealing ring 140 is mounted on the column 121, so that the sealing ring 140 contacts the column 121, the first connecting portion 122, the first insulating member 130, and the cover 110. The sealing ring 140 fills the tiny gap between the pole 120 and the cover 110, effectively preventing dust, moisture, and other impurities from entering the battery cell, preventing short circuits or corrosion inside the battery cell, and ensuring the normal operation and service life of the battery cell. It also acts as a buffer during battery cell operation, reducing direct collision and wear between the pole 120 and the cover 110, and reducing the risk of loosening or damage to the connection due to vibration. By covering the contact area between the first insulating member 130 and the first connecting portion 122 with the sealing ring 140, the aluminum material under the contact area between the first insulating member 130 and the first connecting portion 122 can be prevented from being corroded and causing the copper layer and the aluminum layer of the pole 120 to fall off, thereby improving the electrical safety of the battery cell; and the pole 120 provided by the present invention, wherein the column body 121 and the first connecting portion 122 are integrally formed, and the forming is simple, which can effectively improve the forming efficiency of the pole 120.

[0044] like Figure 7 As shown, in other possible implementations, the cover plate 110 is provided with two first through holes 111, which are respectively provided at both ends of the cover plate 110, and the positive electrode post 120 and the negative electrode post 120 are respectively installed in the two first through holes 111. It is understandable that the number of through holes provided on the cover plate 110 can be set according to needs.

[0045] In other implementations, the sealing ring 140 can be a rubber sealing ring, a fluororubber sealing ring, a silicone rubber sealing ring, etc., which can be selected according to actual use requirements. The material of the first insulating member 130 can be polyphenylene sulfide, polypropylene, polytetrafluoroethylene, etc., which can be selected according to actual use requirements.

[0046] Inside the battery cell, if aluminum and copper are exposed at the same time, a primary battery will be formed between the copper and aluminum under the action of the electrolyte, and electrochemical corrosion will occur. The aluminum with a low potential will be corroded, causing the terminal 120 to break.

[0047] Therefore, if Figures 2 to 4 As shown, in one embodiment, the distance a between the outer peripheral edge of the sealing ring 140 and the abutment point between the first insulating member 130 and the first connecting portion 122 satisfies 0.5 mm≤a≤2 mm.

[0048] In this embodiment, the sealing ring 140 covers the abutment between the first insulating member 130 and the first connecting portion 122, and the outer peripheral edge of the sealing ring 140 exceeds the abutment between the first insulating member 130 and the first connecting portion 122, so that the distance a from the outer peripheral edge of the sealing ring 140 to the abutment between the first insulating member 130 and the first connecting portion 122 is between 0.5 mm and 2 mm, and can specifically be 0.5 mm, 0.8 mm, 1 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, etc., which can be set according to actual usage requirements without specific restrictions.

[0049] If the distance a between the outer edge of the sealing ring 140 and the abutment between the first insulating member 130 and the first connecting portion 122 is too small, for example, less than 0.5 mm, the sealing ring 140 may not effectively cover the abutment between the first insulating member 130 and the first connecting portion 122, causing the copper and aluminum of the first connecting portion 122 to be directly exposed to a corrosive environment. Under the action of the electrolyte, electrochemical corrosion occurs between the copper and aluminum, resulting in fracture of the terminal 120. If the distance a between the outer edge of the sealing ring 140 and the abutment between the first insulating member 130 and the first connecting portion 122 is too large, for example, greater than 2 mm, the sealing ring 140 will occupy excessive space, hindering the assembly of other components in the cell cover plate assembly 100. By setting an appropriate distance a, the abutment between the first insulating member 130 and the first connecting portion 122 can be effectively sealed, preventing the copper and aluminum of the first connecting portion 122 from being directly exposed to the corrosive environment, thereby further preventing fracture of the terminal 120.

[0050] In one embodiment, a distance h from the lower surface of the first connecting portion 122 to the lower surface of the first insulating member 130 satisfies 0.2 mm ≤ h ≤ 1 mm.

[0051] In this embodiment, the distance h from the lower surface of the first connecting portion 122 to the lower surface of the first insulating member 130 can be, for example, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm, and can be set based on actual usage requirements without specific limitations. If h is too small, for example, less than 0.2 mm, the first insulating member 130 may be susceptible to cracking when the lower surface of the electrode 120 is subjected to pressure during assembly of the cell cover assembly 100. Furthermore, the first insulating member 130 may be easily burned when the tabs are welded to the bottom of the electrode 120. If h is too large, for example, greater than 1 mm, the first insulating member 130 may excessively encroach on the height space of the cell, which is not conducive to increasing cell capacity and increases manufacturing costs. By setting a suitable distance h, the manufacturing cost of the first insulating member 130 can be effectively reduced, and the damage probability of the first insulating member 130 can be reduced, thereby avoiding frequent repairs of the cell cover assembly 100 and improving the service life of the cell cover assembly 100.

[0052] In one embodiment, the first connecting portion 122 includes an aluminum portion 1222 and a copper portion 1223. The aluminum portion 1222 is fixedly connected to the column 121, and the copper portion 1223 is fixedly connected to the aluminum portion 1222 and is located at an end away from the column 121. The first insulating member 130 is provided with a groove 131 extending from the end surface of the first insulating member 130 in a direction away from the first connecting portion 122. The first flange 1221 is installed in the groove 131 and abuts against the inner wall of the groove 131.

[0053] In this embodiment, the first connecting portion 122 is a copper-aluminum composite material composed of an aluminum portion 1222 and a copper portion 1223. The aluminum portion 1222 is made of the same material as the column 121, and thus can be fixedly connected to the column 121 by cold heading. When the copper portion 1223 and the aluminum portion 1222 of the first connecting portion 122 are connected to each other, the copper portion 1223 and the aluminum portion 1222 can be fixedly connected together by explosive rolling to form the first connecting portion 122. First, the aluminum portion 1222 is placed above the copper portion 1223. Then, high-detonation-velocity explosives are evenly applied to the surface of the aluminum portion 1222. The instantaneous high pressure and high-speed impact generated by the explosive detonation causes the aluminum portion 1222 and the copper portion 1223 to undergo plastic deformation and metallurgical bonding at the interface, thereby fixedly connecting the aluminum portion 1222 and the copper portion 1223 to form the first connecting portion 122.

[0054] Furthermore, a groove 131 is provided on the first insulating member 130, extending from the end surface of the first insulating member 130 in a direction away from the first connecting portion 122. After the first flange 1221 is installed in the groove 131, the first flange 1221 is abutted against the inner wall of the groove 131, so that the junction of the copper portion 1223 and the aluminum portion 1222 is located in the groove 131, thereby preventing the electrolyte inside the battery cell from contacting the junction of the copper portion 1223 and the aluminum portion 1222, preventing the aluminum portion 1222 from being corroded, and thus causing the pole 120 to break.

[0055] In other possible implementations, the copper portion 1223 and the aluminum portion 1222 may be fixedly connected together by cold rolling or hot rolling, and the specific method may be selected according to actual needs.

[0056] In one embodiment, the thickness L1 of the groove wall 132 of the groove 131 satisfies 0.2mm≤L1≤3mm; the thickness L3 of the copper portion 1223 on the first flange 1221 satisfies 0.5mm≤L3≤3mm, and the depth L2 of the groove 131 satisfies 2mm≤L1+L2+L3≤12mm.

[0057] In this embodiment, the thickness L1 of the groove wall 132 of the groove 131 can be specifically 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, etc.; the thickness L3 of the copper part 1223 on the first flange 1221 can be specifically 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, etc.; L1+L2+L3 can be specifically 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, etc., and can be set according to actual usage requirements without specific restrictions.

[0058] Inside the battery cell, the electrolyte reaches the junction of the copper portion 1223 and the aluminum portion 1222 via two paths. The first path is the upper surface of the first connecting portion 122. Because the sealing ring 140 covers the abutment between the first insulating member 130 and the first connecting portion 122, the electrolyte can only reach the junction of the copper portion 1223 and the aluminum portion 1222 through the second path. The second path is the underside of the first flange 1221, which is covered by the first insulating member 130. Therefore, by appropriately sizing the first insulating member 130, the electrolyte can be effectively prevented from invading the junction of the copper portion 1223 and the aluminum portion 1222, thereby preventing corrosion of the aluminum portion 1222 and subsequent fracture of the terminal 120. If L1+L2+L3 is too small, for example, less than 2 mm, the electrolyte will penetrate due to the shorter size of the first insulating part 130, increasing the risk of corrosion of the aluminum part 1222; if L1+L2+L3 is too large, for example, greater than 12 mm, it will occupy too much internal space of the battery cell and increase the production cost of the first insulating part 130.

[0059] In one embodiment, it further includes: an upper plastic ring 160, which is sleeved on the pole 120, and the upper plastic ring 160 includes a plastic ring body 161 and a first ring body 162 arranged on the outer periphery of the plastic ring body 161; a connecting member 170, which abuts on the plastic ring body 161 and is arranged in the first ring body 162, and the connecting member 170 is connected to the pole 120.

[0060] In this embodiment, the upper plastic ring 160 further includes a third through-hole 163 on the plastic ring body 161. The upper plastic ring 160 is sleeved onto the terminal 120, allowing the terminal 120 to fit within the third through-hole 163 and allowing the plastic ring body 161 to abut against the top of the cover plate 110. A connector 170 is disposed within the first ring body 162. The connector 170 abuts against the plastic ring body 161 and the inner wall of the first ring body 162. The connector 170 can be connected to the terminal 120. Through the mutual abutment between the connector 170 and the terminal 120, the upper plastic ring 160 can be fixed between the terminal 120 and the cover plate 110 without the need for additional connectors, thereby improving the space utilization within the battery cell. During operation, the battery cell may be subject to vibration or impact. The upper plastic ring 160 also acts as a buffer, reducing direct impact and wear between the terminal 120 and the cover 110, and reducing the risk of loosening or damage caused by vibration. Furthermore, the upper plastic ring 160 has excellent insulation properties, preventing accidental conductive contact between the terminal 120 and the cover 110, thereby further improving the electrical safety of the battery cell.

[0061] In one embodiment, the pole 120 further includes a second connecting portion 123 disposed on the top of the column 121 , the second connecting portion 123 is provided with a second flange 1231 , the connecting member 170 is provided with a limiting step 171 , and the second flange 1231 abuts against the limiting step 171 .

[0062] In this embodiment, a second connecting portion 123 is provided at the top of the pole 120. The second connecting portion 123 is arranged above the column 121. The pole 120 is composed of the column 121, the first connecting portion 122, and the second connecting portion 123. The diameter of the second connecting portion 123 is smaller than the diameter of the column 121. A second flange 1231 is provided at the top of the second connecting portion 123. A limiting step 171 is provided on the connector 170. The second flange 1231 abuts against the limiting step 171, and the top of the column 121 abuts against the lower surface of the connector 170, thereby forming a riveted structure between the connector 170 and the pole 120. This fixes the connector 170 to the pole 120, thereby fixing the pole 120 to the cell cover plate assembly 100. Riveting the connector 170 to the pole 120 can effectively limit the movement of the pole 120 and prevent displacement due to vibration or other external forces during operation, thereby ensuring the reliability of the connection of the pole 120.

[0063] like Figure 6As shown, in other possible implementations, the pole 120 in the cell cover assembly 100 includes a column 121 and a first connecting portion 122. A through-hole is provided in the connector 170, and the column 121 is disposed within the through-hole and abuts against the inner wall of the through-hole. Welding is then performed at the abutment between the column 121 and the inner wall of the through-hole to securely connect the pole 120 to the connector 170. The connection method between the pole 120 and the connector 170 can be selected based on actual usage requirements and is not specifically limited.

[0064] In one embodiment, a second insulating member 150 is further included, which is abutted between the cover plate 110 and the first insulating member 130 ; a second through hole 151 corresponding to the first through hole 111 is defined on the second insulating member 150 , and the pole 120 is installed in the second through hole 151 .

[0065] In this embodiment, the upper surface of the second insulating member 150 abuts the lower surface of the cover plate 110, and the lower surface of the second insulating member 150 partially abuts the first insulating member 130. Positioning the second insulating member 150 between the cover plate 110 and the first insulating member 130 further provides a buffering effect during battery cell operation, reducing direct collision and wear between the terminal 120 and the cover plate 110, and lowering the risk of loosening or damage to the connection due to vibration. A second through-hole 151 is provided on the insulating member, corresponding to the first through-hole 111. The terminal 120 is installed in the second through-hole 151, facilitating a secure connection between the terminal 120 and the connector 170 after passing through the first and second through-holes 111, 151.

[0066] The cell cover plate assembly 100 provided by the present invention was tested, as shown in Table 1:

[0067] Table 1

[0068]

[0069]

[0070] As can be seen from Table 1, by properly setting the thickness L1 of the groove wall 132 of the groove 131, the thickness L3 of the copper portion 1223 on the first flange 1221, and the parameters L1+L2+L3, it is possible to effectively prevent the electrolyte from diffusing to the junction of the copper portion 1223 and the aluminum portion 1222, thereby reducing the possibility of fracture of the pole 120; and it is also beneficial to the cold heading forming of the pole 120.

[0071] In the second aspect, the present invention also provides a battery cell, including: a battery cell cover assembly 100; a shell, the shell having a accommodating cavity and an opening connected to the accommodating cavity, and the battery cell cover assembly 100 covers the opening; a pole group, arranged in the accommodating cavity, with a pole ear on the pole group, and the pole ear is electrically connected to the pole column 120.

[0072] In this embodiment, the shell of the battery cell and the battery cell cover assembly 100 form a closed space, which can effectively protect the electrode group and other internal components from external physical damage, such as collision, extrusion, etc.; it can also prevent dust, moisture and other impurities from entering the accommodating cavity, avoid affecting the normal operation of the battery cell, and reduce the probability of faults such as short circuits and corrosion. The electrode group is set in the accommodating cavity and then sealed with the cover 110 assembly. This assembly method is simple and efficient, and when maintenance or replacement of internal components is required, the cover 110 can also be opened relatively conveniently for operation. By electrically connecting the pole ear with the pole post 120, the intermediate links and resistance of current transmission are reduced, and the current can flow more quickly and efficiently between the pole group and the external circuit, thereby improving the charge and discharge performance of the battery cell.

[0073] In this embodiment, the battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be recharged to activate active materials after being discharged and can be used continuously.

[0074] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead storage battery cell, etc., and the embodiment of the present invention is not limited to this.

[0075] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductive medium between the positive and negative electrodes. The present invention does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0076] According to a third aspect of an embodiment of the present invention, a battery pack is provided, comprising: a plurality of battery cells as described above. The battery pack also includes a housing for housing the plurality of battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells. Furthermore, the placement of the plurality of battery cells within the housing of the battery pack can increase the overall energy density of the battery pack and enhance the performance of the battery pack.

[0077] The battery packs described in the embodiments of the present invention may comprise one or more battery cells, providing a single physical module with higher voltage and capacity. When multiple battery cells are present, they are connected in series, parallel, or in parallel via a busbar. Multiple battery cells may be directly assembled into a battery pack, or they may be assembled into battery modules, which are then assembled into a battery pack.

[0078] The battery cells of the embodiments of the present invention may be cylindrical, prismatic, pouch, or other shaped cells. Prismatic cells may include square-shell, blade-shaped, or other polygonal cells, such as hexagonal or octagonal cells, but the embodiments of the present invention are not limited thereto.

[0079] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0080] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: a cover plate, wherein a first through hole is provided on the cover plate; A pole, installed in the first through hole, the pole comprising a column and a first connecting portion provided at the bottom of the column, a first flange being provided on an outer peripheral wall of the first connecting portion; a first insulating member, sleeved on the first flange and abutting against the outer peripheral wall of the first connecting portion; A sealing ring is sleeved on the column and respectively abuts against the column, the first connecting portion, the first insulating member and the cover plate. The sealing ring covers the abutment portion between the first insulating member and the first connecting portion.

2. The battery cover assembly according to claim 1, characterized in that: A distance a between an outer peripheral edge of the sealing ring and a contact point between the first insulating member and the first connecting portion satisfies 0.5 mm ≤ a ≤ 2 mm.

3. The battery cover assembly according to claim 1, characterized in that: A distance h from a lower surface of the first connecting portion to a lower surface of the first insulating member satisfies 0.2 mm ≤ h ≤ 1 mm.

4. The battery cover assembly according to claim 1, characterized in that: The first connecting portion includes an aluminum portion and a copper portion, the aluminum portion is fixedly connected to the column, and the copper portion is fixedly connected to the aluminum portion and is located at one end away from the column; The first insulating member is provided with a groove extending from an end surface of the first insulating member in a direction away from the first connecting portion. The first flange is installed in the groove and abuts against an inner wall of the groove.

5. The battery cover assembly according to claim 4, characterized in that: The groove wall thickness L1 of the groove satisfies 0.2mm≤L1≤3mm; the thickness L3 of the copper part on the first flange satisfies 0.5mm≤L3≤3mm, and the depth of the groove is L2, 2mm≤L1+L2+L3≤12mm.

6. The battery cover assembly according to claim 1, characterized in that: Also includes: An upper plastic ring is sleeved on the pole, and the upper plastic ring comprises a plastic ring body and a first ring body arranged on the outer periphery of the plastic ring body; A connecting piece is abutted against the plastic ring body and is arranged in the first ring body. The connecting piece is connected to the pole.

7. The battery cover assembly according to claim 6, characterized in that: The pole further comprises a second connecting portion arranged at the top of the column body, the second connecting portion is provided with a second flange, the connecting member is provided with a limiting step, and the second flange abuts against the limiting step.

8. The battery cell cover assembly according to any one of claims 1 to 7, characterized in that: It also includes a second insulating member abutting between the cover plate and the first insulating member; the second insulating member is provided with a second through hole corresponding to the first through hole, and the pole is installed in the second through hole.

9. A battery cell, characterized in that: include: The battery cell cover assembly according to any one of claims 1 to 8; A housing having a receiving cavity and an opening communicating with the receiving cavity, wherein the cell cover assembly covers the opening; The pole group is arranged in the accommodating cavity, and the pole group is provided with a pole ear, and the pole ear is electrically connected to the pole column.

10. A battery pack, characterized in that: include: A box and a plurality of battery cells according to claim 9, wherein the plurality of battery cells are accommodated in the box.

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