Battery cell cover plate assembly, battery cell, and battery pack

Abstract

The application relates to the technical field of batteries, and discloses a battery cell cover plate assembly, a battery cell and a battery pack, which comprise a cover plate, a first through hole is arranged on the cover plate, a pole is arranged in the first through hole, the pole comprises a pole body and a first connecting part arranged at the bottom of the pole body, a first flange is arranged on the outer peripheral wall of the first connecting part, a first insulating part is sleeved on the first flange and abuts against the outer peripheral wall of the first connecting part, a sealing ring is sleeved on the pole body and abuts against the pole body, the first connecting part, the first insulating part and the cover plate respectively, and the sealing ring covers the abutting position of the first insulating part and the first connecting part. The pole is simple in forming, and the forming efficiency of the pole is improved; the abutting position of the first insulating part and the first connecting part is covered by the sealing ring, so that the aluminum material under the abutting position of the first insulating part and the first connecting part is prevented from being corroded and the copper layer and the aluminum layer of the pole are prevented from falling off, thereby improving the electrical safety of the battery cell.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to cell cover assemblies, cells, and battery packs. Background Technology

[0002] With the increasing maturity of new energy battery technology, new energy batteries are widely used as power batteries in electric vehicles and energy storage, and the performance requirements for new energy batteries are becoming increasingly stringent.

[0003] In related technologies, new energy batteries are composed of multiple cells, and cells generally include cover plate assembly, electrode assembly and casing. Currently, the electrode post forming of the negative electrode side terminal in the cover plate assembly is complicated, and the copper layer and aluminum layer of the electrode post are prone to falling off, which causes the cell to be unable to be used normally. Summary of the Invention

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

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

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

[0007] An electrode post is installed in the first through hole. The electrode post includes a column body and a first connecting part disposed at the bottom of the column body. A first flange is provided on the outer peripheral wall of the first connecting part.

[0008] The first insulating element is sleeved on the first flange and abuts against the outer peripheral wall of the first connecting portion;

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

[0010] Beneficial effects: The bottom of the electrode post is provided with a first connecting part, and a first flange is provided on the outer peripheral wall of the first connecting part. Then, a first insulating element is sleeved on the first flange. A sealing ring is further sleeved on the main body, so that the sealing ring abuts against the post, the first connecting part, the first insulating element, and the cover plate respectively. The sealing ring covers the abutment point between the first insulating element and the first connecting part, preventing corrosion of the aluminum material under the abutment point from causing the copper layer and aluminum layer of the electrode post to detach, thereby improving the electrical safety of the battery cell. Furthermore, the electrode post provided by this invention has its post body and first connecting part integrally formed, simplifying the molding process and effectively improving the molding efficiency of the electrode post.

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

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

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

[0014] The first insulating member has a groove extending from the end face of the first insulating member away from the first connecting portion, and the first flange is installed in the groove and abuts against the inner wall of the groove.

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

[0016] In one alternative implementation, it further includes:

[0017] An upper plastic ring is fitted onto the electrode post. The upper plastic ring includes a plastic ring body and a first ring body disposed on the outer periphery of the plastic ring body.

[0018] A connector abuts against the main body of the plastic ring and is disposed within the first ring body; the connector is connected to the pole post.

[0019] In one optional embodiment, the pole post further includes a second connecting portion disposed at the top of the pole body, the second connecting portion having a second flange, the connector having a limiting step, and the second flange abutting against the limiting step.

[0020] In one optional embodiment, a second insulating member is further included, 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 post is installed in the second through hole.

[0021] Secondly, the present invention also provides a battery cell, comprising:

[0022] The cell cover assembly as described above;

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

[0024] An electrode assembly is disposed within the receiving cavity, and the electrode assembly is provided with electrode tabs, which are electrically connected to the electrode post.

[0025] Beneficial effects: The cell casing and cell cover assembly form a sealed space, effectively protecting the electrode assembly and other internal components from external physical damage such as impacts and compression. It also prevents dust, moisture, and other impurities from entering the cavity, avoiding any impact on the cell's normal operation and reducing the likelihood of short circuits, corrosion, and other malfunctions. Placing the electrode assembly within the cavity and then sealing it with the cover assembly is a simple and efficient assembly method. Furthermore, the cover can be easily opened for maintenance or replacement of internal components. Electrically connecting the tabs to the terminals reduces intermediate current transmission links and resistance, allowing current to flow more quickly and efficiently between the electrode assembly and the external circuitry, thus improving the cell's charging and discharging performance.

[0026] Thirdly, the present invention also provides a battery pack, comprising: a housing and a plurality of battery cells as described above, wherein the plurality of battery cells are housed in the housing.

[0027] Beneficial effects: The battery pack also includes a housing, which houses multiple battery cells. The housing prevents liquids or other foreign objects from affecting the charging or discharging of the cells. Moreover, placing multiple battery cells inside the battery pack's housing can increase the overall energy density of the battery pack and improve its performance. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a perspective view of a battery cell cover assembly according to an embodiment of the present invention;

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

[0031] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0032] Figure 4 for Figure 3 A magnified view of part B in the diagram;

[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 perspective view of a battery cell cover assembly according to another embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Cell cover assembly; 110. Cover plate; 111. First through hole; 120. Terminal post; 121. Post body; 122. First connecting part; 1221. First flange; 1222. Aluminum part; 1223. Copper part; 123. Second connecting part; 1231. Second flange; 130. First insulating component; 131. Groove; 132. Groove wall; 140. Sealing ring; 141. Sealing ring body; 142. Third ring body; 150. Second insulating component; 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 Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] The following is combined with Figures 1 to 7 The following describes embodiments of the present invention.

[0040] According to an embodiment of the present invention, in one aspect, in conjunction with [see also...] Figures 1 to 5 A battery cell cover assembly 100 is provided, comprising: a cover plate 110 having a first through hole 111; a pole post 120 installed in the first through hole 111, the pole post 120 including a column body 121 and a first connecting portion 122 disposed at the bottom of the column body 121, the outer peripheral wall of the first connecting portion 122 having a first flange 1221; a first insulating member 130 sleeved on the first flange 1221 and abutting against the outer peripheral wall of the first connecting portion 122; and a sealing ring 140 sleeved on the column body 121 and abutting against the column body 121, the first connecting portion 122, the first insulating member 130 and the cover plate 110 respectively, the sealing ring 140 covering the abutment between the first insulating member 130 and the first connecting portion 122.

[0041] In this embodiment, the cover plate 110 can be a plain aluminum plate. A first through hole 111 is formed in the center of the plain aluminum plate. The first through hole 111 can be circular. By rationally setting the position of the first through hole 111, during the assembly of various components on the cover plate 110, operators can more clearly distinguish the purpose of the through holes at different positions, improving assembly efficiency. It also allows operators to quickly locate and handle problems related to specific through holes during maintenance. Furthermore, it maximizes the structural strength of the cover plate 110 while ensuring the functionality of other components on the cover plate 110. The terminal 120 is the conductive interface connecting the battery cell to the external circuit, responsible for current input or output. The negative terminal 120 and the positive terminal 120 together constitute the external electrical interface of the battery cell. In this embodiment, the terminal 120 can be the negative terminal 120, serving as the conductive connection terminal of the negative electrode 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 electrode 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 electrode post 120 can be any shape and are not limited to circles. The specific shape can be selected according to the actual use requirements.

[0042] Further, the pole post 120 includes a column body 121 and a first connecting portion 122 disposed at the bottom of the column body 121, wherein the pole post 120 can be formed by cold forging. The pole post 120 is composed of the column body 121 and the first connecting portion 122 disposed at the bottom of the column body 121, wherein the diameter of the first connecting portion 122 is larger than the diameter of the column body 121. This allows the sealing ring 140 to abut against the upper surfaces of the column body 121 and the first connecting portion 122 when it is fitted onto the pole post 120. A first flange 1221 is provided on the outer peripheral wall of the first connecting portion 122, and the first flange 1221 extends from the end face of the outer peripheral wall of the first connecting portion 122 in a direction away from the first connecting portion 122. A first insulating member 130 is fitted onto the first flange 1221, and the first insulating member 130 abuts against the end face of the outer peripheral wall of the first connecting portion 122, such that the first insulating member 130 can cover the first flange 1221. The first insulating component 130 can be integrated with the pole post 120 by integral injection molding.

[0043] Furthermore, a sealing ring 140 is fitted onto the post 121, so that the sealing ring 140 abuts against the post 121, the first connecting part 122, the first insulating part 130, and the cover plate 110 respectively. The sealing ring 140 can fill the tiny gap between the post 120 and the cover plate 110, effectively preventing external dust, moisture, and other impurities from entering the cell, avoiding short circuits or corrosion inside the cell, and ensuring the normal operation and service life of the cell. Moreover, it can also play a buffering role during the operation of the cell, and reduce direct collision and wear between the post 120 and the cover plate 110, 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 part 122 with the sealing ring 140, the aluminum material under the contact area between the first insulating member 130 and the first connecting part 122 can be prevented from being corroded, thus preventing the copper layer and aluminum layer of the pole post 120 from falling off, thereby improving the electrical safety of the battery cell; moreover, the pole post 120 provided by the present invention has its pole body 121 and the first connecting part 122 integrally formed, which is simple to form and can effectively improve the forming efficiency of the pole post 120.

[0044] like Figure 7 As shown, in other possible implementations, the cover plate 110 has two first through holes 111, which are respectively located at both ends of the cover plate 110. A positive terminal 120 and a negative terminal 120 are respectively installed in the two first through holes 111. It can be understood that the number of through holes on the cover plate 110 can be set according to the requirements.

[0045] In other possible 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 application requirements. The material of the first insulating component 130 can be polyphenylene sulfide, polypropylene, polytetrafluoroethylene, etc., which can be selected according to actual application requirements.

[0046] If aluminum and copper are exposed inside the battery cell at the same time, a galvanic cell will form between the copper and aluminum under the action of the electrolyte, which will cause electrochemical corrosion. The aluminum with the lower potential will be corroded, resulting in the breakage of the terminal 120.

[0047] Therefore, as 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 of the first insulating member 130 and the first connecting portion 122 satisfies 0.5mm≤a≤2mm.

[0048] In this embodiment, while the sealing ring 140 covers the abutment of the first insulating member 130 and the first connecting portion 122, the outer peripheral edge of the sealing ring 140 extends beyond the abutment of 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 of the first insulating member 130 and the first connecting portion 122 is between 0.5mm and 2mm, specifically 0.5mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, etc., which can be set according to actual usage requirements and are not specifically limited.

[0049] If the distance 'a' from the outer edge of the sealing ring 140 to the contact point between the first insulator 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 contact point, 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 will occur between the copper and aluminum, leading to the breakage of the electrode post 120. If the distance 'a' from the outer edge of the sealing ring 140 to the contact point between the first insulator 130 and the first connecting portion 122 is too large, for example, greater than 2 mm, the sealing ring 140 will occupy too much space, which is not conducive to the assembly of other components in the cell cover assembly 100. By setting an appropriate distance 'a', the contact point between the first insulator 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 a corrosive environment, thereby further preventing the breakage of the electrode post 120.

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

[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 specifically be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc., and can be set according to actual usage requirements without specific limitations. If h is too small, for example, less than 0.2mm, the first insulating member 130 is prone to cracking when the lower surface of the electrode post 120 is subjected to pressure during the assembly of the cell cover plate assembly 100, and the first insulating member 130 is prone to being burned when the electrode tab is welded to the bottom of the electrode post 120. If h is too large, for example, greater than 1mm, the first insulating member 130 will encroach too much on the height space of the cell, which is not conducive to increasing the cell capacity and has a high manufacturing cost. By setting an appropriate distance h, the manufacturing cost of the first insulating component 130 can be effectively reduced, the probability of damage to the first insulating component 130 can be reduced, frequent repairs of the cell cover assembly 100 can be avoided, thereby 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 located at one end away from the column 121. The first insulating member 130 is provided with a groove 131 extending from the end face 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 part 122 is a copper-aluminum composite material composed of an aluminum part 1222 and a copper part 1223. The aluminum part 1222 is made of the same material as the column 121, and therefore can be fixedly connected to the column 121 by cold forging. When the copper part 1223 and the aluminum part 1222 of the first connecting part 122 are connected to each other, the copper part 1223 and the aluminum part 1222 can be fixedly connected together to form the first connecting part 122 by explosive rolling. First, the aluminum part 1222 is placed above the copper part 1223. Then, high-velocity explosive is evenly spread on the surface of the aluminum part 1222. The instantaneous high pressure and high-speed impact generated by the explosive detonation cause plastic deformation and metallurgical bonding of the aluminum part 1222 and the copper part 1223 at the interface, thereby fixing the aluminum part 1222 and the copper part 1223 together to form the first connecting part 122.

[0054] Furthermore, a groove 131 extending from the end face of the first insulating member 130 away from the first connecting portion 122 is formed on the first insulating member 130. After the first flange 1221 is installed in the groove 131, the first flange 1221 abuts against the inner wall of the groove 131, so that the joint of the copper portion 1223 and the aluminum portion 1222 is located in the groove 131. This prevents the electrolyte inside the cell from contacting the joint of the copper portion 1223 and the aluminum portion 1222, and prevents the aluminum portion 1222 from being corroded, thereby causing the electrode post 120 to break.

[0055] In other possible implementations, the copper part 1223 and the aluminum part 1222 can be fixedly connected together by cold rolling or hot rolling, and the specific method can 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 part 1223 on the first flange 1221 satisfies 0.5mm≤L3≤3mm; and the depth of the groove 131 is L2, 2mm≤L1+L2+L3≤12mm.

[0057] In this embodiment, the thickness L1 of the groove wall 132 of the groove 131 can be 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 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 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, etc., and can be set according to actual usage requirements without specific limitations.

[0058] Inside the battery cell, the electrolyte contacts 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. Since the sealing ring 140 covers the contact area between the first insulating member 130 and the first connecting portion 122, the electrolyte can only contact the junction of the copper portion 1223 and the aluminum portion 1222 via the second path. The second path is the lower side of the first flange 1221, which is covered by the first insulating member 130. Therefore, by setting an appropriate size for the first insulating member 130, the electrolyte can be effectively prevented from penetrating to the junction of the copper portion 1223 and the aluminum portion 1222, thereby preventing corrosion of the aluminum portion 1222 and subsequent breakage of the terminal post 120. If L1+L2+L3 is too small, for example, less than 2mm, the electrolyte will seep in due to the short size of the first insulating component 130, increasing the risk of corrosion of the aluminum part 1222. If L1+L2+L3 is too large, for example, greater than 12mm, it will occupy too much internal space of the battery cell and increase the manufacturing cost of the first insulating component 130.

[0059] In one embodiment, it further includes: an upper plastic ring 160, which is sleeved on the pole post 120. The upper plastic ring 160 includes a plastic ring body 161 and a first ring body 162 disposed on the outer periphery of the plastic ring body 161; a connector 170, which abuts against the plastic ring body 161 and is disposed inside the first ring body 162, and the connector 170 is connected to the pole post 120.

[0060] In this embodiment, the upper plastic ring 160 has a third through hole 163 on its main body 161. The upper plastic ring 160 is fitted onto the terminal post 120, so that the terminal post 120 is installed in the third through hole 163, and the main body 161 of the plastic ring abuts against the top of the cover plate 110. A connector 170 is provided inside the first ring body 162. The connector 170 abuts against the main body 161 of the plastic ring and against the inner wall of the first ring body 162. The connector 170 can be connected to the terminal post 120. Through the mutual abutment between the connector 170 and the terminal post 120, the upper plastic ring 160 can be fixed between the terminal post 120 and the cover plate 110 without the need for additional connectors, thereby improving the space utilization rate inside the battery cell. During operation, the battery cell may be subjected to vibration or impact. The upper plastic ring 160 also acts as a buffer, reducing direct collision and wear between the terminal post 120 and the cover plate 110, and lowering the risk of loosening or damage to the connection due to vibration. At the same time, the upper plastic ring 160 has good insulation properties, which can prevent accidental conductive contact between the terminal post 120 and the cover plate 110, thereby further improving the electrical safety of the battery cell.

[0061] In one embodiment, the pole post 120 further includes a second connecting portion 123 disposed at the top of the post body 121, the second connecting portion 123 being provided with a second flange 1231, the connector 170 being provided with a limiting step 171, and the second flange 1231 abutting against the limiting step 171.

[0062] In this embodiment, a second connecting portion 123 is provided at the top of the pole post 120, and the second connecting portion 123 is disposed above the column body 121. The pole post 120 is composed of the column body 121, a first connecting portion 122, and a second connecting portion 123, wherein the diameter of the second connecting portion 123 is smaller than the diameter of the column body 121. A second flange 1231 is provided at the top of the second connecting portion 123, and 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 body 121 abuts against the lower surface of the connector 170, thereby forming a riveting structure between the connector 170 and the pole post 120 to fix the connector 170 and the pole post 120, thereby fixing the pole post 120 to the cell cover assembly 100. Riveting the connector 170 to the pole post 120 can effectively restrict the movement of the pole post 120 and prevent it from being displaced due to vibration or other external forces during operation, thereby ensuring the reliability of the pole post 120 connection.

[0063] like Figure 6As shown, in other possible implementations, the electrode post 120 in the cell cover assembly 100 includes a post 121 and a first connecting portion 122. The connector 170 has a through hole, and the post 121 is disposed within the through hole and abuts against the inner wall of the through hole. Then, welding is performed at the abutment point between the post 121 and the inner wall of the through hole, thus fixing the electrode post 120 to the connector 170. The connection method between the electrode post 120 and the connector 170 can be selected according to actual usage requirements and is not specifically limited.

[0064] In one embodiment, a second insulating member 150 is also included, which abuts between the cover plate 110 and the first insulating member 130; the second insulating member 150 is provided with a second through hole 151 corresponding to the first through hole 111, and the pole post 120 is installed in the second through hole 151.

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

[0066] The battery cell cover assembly 100 provided by the present invention was tested, and the results are shown in Table 1:

[0067] Table 1

[0068]

[0069]

[0070] As can be seen from Table 1, by reasonably setting the thickness L1 of the groove wall 132 of the groove 131, the thickness L3 of the copper part 1223 on the first flange 1221, and the parameters of L1+L2+L3, the electrolyte can be effectively prevented from diffusing to the junction of the copper part 1223 and the aluminum part 1222, thereby reducing the possibility of the electrode post 120 breaking; and it is also beneficial to the cold heading of the electrode post 120.

[0071] In a second aspect, the present invention also provides a battery cell, comprising: a battery cell cover assembly 100; a housing having a receiving cavity and an opening communicating with the receiving cavity, the battery cell cover assembly 100 covering the opening; and an electrode group disposed within the receiving cavity, the electrode group having electrode tabs provided thereon, the electrode tabs being electrically connected to electrode posts 120.

[0072] In this embodiment, the cell casing and the cell cover assembly 100 form a closed space, effectively protecting the electrode assembly and other internal components from external physical damage, such as impacts and compression. Furthermore, it prevents dust, moisture, and other impurities from entering the cavity, avoiding any impact on the normal operation of the cell and reducing the likelihood of short circuits, corrosion, and other malfunctions. Placing the electrode assembly within the cavity and then sealing it with the cover assembly 110 is a simple and efficient assembly method. Moreover, when maintenance or replacement of internal components is required, the cover assembly 110 can be opened relatively easily for operation. By electrically connecting the tabs to the terminals 120, intermediate links and resistance in current transmission are reduced, allowing current to flow more quickly and efficiently between the electrode assembly and the external circuit, thus improving the cell's charging and discharging performance.

[0073] In this embodiment, the battery cell can be a secondary battery cell, which refers to a battery cell that can be reactivated by charging after the battery cell has been discharged, so that it can continue to be used.

[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-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present invention are not limited to this.

[0075] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This invention does not impose specific limitations on the type of electrolyte and can select one according to requirements. The electrolyte can be liquid, gel, or solid.

[0076] According to an embodiment of the present invention, in a third aspect, a battery pack is also provided, comprising: a plurality of battery cells as described above. The battery pack further comprises a housing that houses the plurality of battery cells. The housing prevents liquids or other foreign objects from affecting the charging or discharging of the battery cells. Moreover, arranging the plurality of battery cells within the housing of the battery pack can increase the overall energy density of the battery pack and improve its performance.

[0077] The battery pack mentioned in the embodiments of the present invention may include a single physical module of one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple cells are connected in series, parallel, or mixed through a busbar. Multiple battery cells can be directly assembled into a battery pack, or they can be first assembled into battery modules, and then the battery modules are assembled into a battery pack.

[0078] The battery cells in this embodiment of the invention can be cylindrical, prismatic, pouch cells, or other shapes. Prismatic cells may include prismatic cells, blade-shaped cells, or other polyprismatic cells, such as hexagonal or octagonal prismatic cells; however, this embodiment of the invention is not limited to these.

[0079] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0080] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cell cover assembly, characterized in that, include: A cover plate, wherein the cover plate is provided with a first through hole; An electrode post is installed in the first through hole. The electrode post includes a column body and a first connecting part disposed at the bottom of the column body. A first flange is provided on the outer peripheral wall of the first connecting part. The first insulating element is sleeved on the first flange and abuts against the outer peripheral wall of the first connecting portion; A sealing ring is fitted onto the column and abuts against the column, the first connecting part, the first insulating member, and the cover plate respectively. The sealing ring covers the abutment between the first insulating member and the first connecting part. The distance 'a' between the outer peripheral edge of the sealing ring and the contact point between the first insulating component and the first connecting part satisfies 0.5mm ≤ a ≤ 2mm; The distance h from the lower surface of the first connecting part to the lower surface of the first insulating member satisfies 0.2mm≤h≤1mm; The first connecting part includes an aluminum part and a copper part. The aluminum part is fixedly connected to the column, and the copper part is fixedly connected to the aluminum part and located at one end away from the column. The first insulating member has a groove extending from the end face of the first insulating member in a direction away from the first connecting part. The first flange is installed in the groove and abuts against the inner wall of the groove. The groove wall thickness L1 satisfies 0.2mm≤L1≤3mm; the copper part thickness L3 on the first flange satisfies 0.5mm≤L3≤3mm; the groove depth is L2, 2mm≤L1+L2+L3≤12mm.

2. The cell cover assembly according to claim 1, characterized in that, Also includes: An upper plastic ring is fitted onto the electrode post. The upper plastic ring includes a plastic ring body and a first ring body disposed on the outer periphery of the plastic ring body. A connector abuts against the main body of the plastic ring and is disposed within the first ring body; the connector is connected to the pole post.

3. The cell cover assembly according to claim 2, characterized in that, The pole also includes a second connecting part disposed at the top of the pole body, the second connecting part having a second flange, the connecting member having a limiting step, and the second flange abutting against the limiting step.

4. The cell cover assembly according to any one of claims 1 to 3, characterized in that, It also includes a second insulating element, which abuts against the cover plate and the first insulating element; the second insulating element is provided with a second through hole corresponding to the first through hole, and the pole post is installed in the second through hole.

5. A battery cell, characterized in that, include: The cell cover assembly as described in any one of claims 1 to 4; A housing having a receiving cavity and an opening communicating with the receiving cavity, the cell cover assembly sealing the opening; An electrode assembly is disposed within the receiving cavity, and the electrode assembly is provided with electrode tabs, which are electrically connected to the electrode post.

6. A battery pack, characterized in that, include: The enclosure and a plurality of battery cells as described in claim 5, wherein the plurality of battery cells are housed in the enclosure.

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