Battery cell cover plate and battery cell

Abstract

The utility model provides a battery cell cover plate and a battery cell, and the battery cell cover plate comprises a cover plate assembly which comprises a cover body and an insulating part which are arranged in a stacked manner, and the cover body and the insulating part are both provided with mounting holes; the electrode terminal comprises a pole body and a limiting plate which are integrally formed, the pole body penetrates through the mounting hole of the cover body and the mounting hole of the insulating part, and the limiting plate is located on the side, away from the cover body, of the insulating part; a supporting part is arranged on the side, close to the cover body, of the limiting plate in a protruding mode and abuts against the insulating part, so that the insulating part and the limiting plate are separated, and a heat insulation gap is formed between the insulating part and the limiting plate. The supporting part is additionally arranged on the limiting plate, so that the insulating part and the limiting plate can be separated to form the heat insulation gap, the heat transfer efficiency between the insulating part and the limiting plate is reduced, the phenomenon that the battery core is damaged due to high-temperature melting of the insulating part is prevented, the aging speed is slowed down, and the insulating property of the insulating part is ensured; and the overall performance and the product quality of the battery cell can be guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery cell, in particular to a battery cell cover plate and a battery cell. BACKGROUND

[0002] As a basic unit of energy storage system, the performance of the battery cell is crucial; in order to reduce the internal resistance of the battery cell, some battery cells use electrode terminals without adapter plates. At present, the battery cell without adapter plate usually uses laser to weld the tab and the electrode terminal; due to the high heat generated by laser welding in the welding area of the electrode terminal, and the large area of the abutting area between the electrode terminal and the insulating part of the cover assembly, the heat of the welding area can be transmitted to the insulating part through the contact area between the two, when the temperature of the contact area is high, the insulating part will melt and form a bead; with the continuous charging and discharging of the battery cell or under extreme conditions such as vibration, some beads may fall off from the insulating part and enter the JR (winding core structure) of the battery cell; the battery cell is in the process of charging and discharging, the change of its internal structure will cause extrusion to the diaphragm, and the existence of the bead will cause damage to the diaphragm, thereby causing short circuit of the battery cell, and even the phenomenon of thermal runaway may occur, which affects the quality of the battery cell and its safety in use. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to provide a battery cell cover plate and a battery cell to solve the above-mentioned technical problems.

[0004] In order to achieve the above purpose, the present application provides a battery cell cover plate, comprising:

[0005] A cover assembly comprising a cover body and an insulating part stacked together, wherein the cover body and the insulating part are both provided with mounting holes;

[0006] An electrode terminal comprising an integral pole body and a limiting plate, wherein the pole body penetrates through the mounting holes of the cover body and the insulating part respectively, and the limiting plate is located on the side of the insulating part away from the cover body; a supporting part is protrudingly arranged on the side of the limiting plate close to the cover body, and the supporting part abuts against the insulating part to separate the insulating part from the limiting plate and form a heat insulation gap therebetween.

[0007] Based on the same inventive concept, the present application also provides a battery cell comprising the battery cell cover plate as described above.

[0008] From the above, it can be seen that the electric cell cover plate and the electric cell provided by the application can separate the insulating piece and the limiting plate and form a heat insulation gap therebetween by adding a support part on the surface of the limiting plate of the electrode terminal, and the heat insulation gap can block the heat released by the electrode during the welding process, reduce the heat transfer efficiency between the electrode and the insulating piece, prevent the insulating piece from melting at high temperature and causing damage to the electric cell, protect the insulation performance of the insulating piece, delay the aging speed of the insulating piece, and ensure the overall performance of the electric cell and the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0010] Figure 1 is a top view of the electric cell cover plate;

[0011] Figure 2 is an exploded view of the electric cell cover plate;

[0012] Figure 3 is a sectional view of the electric cell cover plate (AA area);

[0013] Figure 4 is a structural schematic view of the electrode terminal;

[0014] Figure 5 is a distribution schematic view of the welding marks on the electrode terminal.

[0015] Explanation of reference signs:

[0016] 100, cover plate assembly; 101, cover body; 102, insulating piece; 110, mounting hole; 120, fitting groove;

[0017] 200, electrode terminal; 201, pole body; 202, limiting plate; 203, support boss; 210, support part; 220, heat insulation gap; 230, welding mark;

[0018] 300, sealing ring;

[0019] 400, insulating sheet;

[0020] 500, fixing part; 510, stepped hole. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to specific embodiments and drawings.

[0022] It should be noted that, unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms "first", "second", and similar terms used in the present application do not denote any order, quantity, or importance, but are used to distinguish different components. The terms "include", "contain", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0023] As a key component of an energy storage system, the quality of the battery cell directly affects the stability and reliability of the entire energy storage system. Square battery cells are widely used in energy storage systems due to their high energy density and good stability. For square battery cells, reducing the internal resistance of the battery cell is one of the effective ways to improve the energy density and charge-discharge efficiency. More specifically, according to Joule's law, under the condition that the charging current and charging time remain unchanged, reducing the internal resistance of the battery cell can significantly reduce the heat generation, thereby improving the reliability and safety of the battery cell under fast charging conditions.

[0024] However, while reducing the internal resistance of the battery cell, the structure of the battery cell also changes and introduces some new problems. For example, to reduce the internal resistance of the battery cell, some battery cells cancel the adapter tab of the battery cell and use electrode terminals without adapter tabs, and then use laser to weld the electrode tabs and electrode terminals. Although the electrode terminals without adapter tabs can effectively reduce the internal resistance of the battery cell, due to the high heat generated in the welding area during laser welding, and there is a large area of contact between the electrode terminals and the plastic layer in the cover assembly used as an insulating member, the heat generated by the welding area not only causes the electrode terminals to heat up, but also transfers heat to the insulating member through the electrode terminals. Under the action of high temperature, the insulating member is prone to melting and forming small beads, which may fall off from the original position during long-term use or under extreme working conditions such as vibration, and may fall into the JR of the battery cell. During the charging and discharging process of the battery cell, the change of the internal pressure of the battery cell may cause the beads to extrude the separator, causing the separator to be damaged, thereby damaging the battery cell, and in severe cases, it may also cause the battery cell to lose control, especially when the above problems occur in the vehicle-mounted energy storage system, which poses a serious threat to the safety of the vehicle.

[0025] In addition, with the development of battery cell technology towards super-fast charging, the temperature rise of the electrode terminal of the battery cell during fast charging is particularly obvious, which not only accelerates the aging speed of the insulating member corresponding to the electrode terminal and reduces the reliability of long-term use, but also may cause a short circuit between the electrode terminal and the cover body in the cover assembly, further increasing the risk of damage to the battery cell and even the entire energy storage system.

[0026] Therefore, how to reduce the internal resistance of the battery cell while solving the heat affected problem caused by laser welding and optimizing the thermal management strategy under the condition of fast charging has become a technical problem that needs to be solved urgently.

[0027] Therefore, how to reduce the internal resistance of the battery cell while solving the heat affected problem caused by laser welding and optimizing the thermal management strategy under the condition of fast charging has become a technical problem that needs to be solved urgently.

[0028] Specifically, please refer to Figures 1-4 , wherein Figure 1 is a top view of the battery cell cover, Figure 2 is an exploded view of the battery cell cover, Figure 3 is a sectional view of the battery cell cover, Figure 4 is a structural schematic view of the electrode terminal 200;

[0029] The present application provides a battery cell cover which can have a blocking effect on the heat released by the battery cell terminal 200; as Figures 1-4As shown, the cell cover plate comprises a cover plate assembly 100 and an electrode terminal 200 arranged on the cover plate assembly 100; the cover plate assembly 100 comprises a laminated cover body 101 and an insulating piece 102, both of which are provided with mounting holes 110, and the mounting holes 110 of the cover body 101 and the insulating piece 102 can provide corresponding mounting positions for the electrode terminal 200; the cover body 101, as the main supporting structure of the cell cover plate, is also used to seal the opening of the shell of the cell; at the same time, the cover body 101 can be formed of materials such as aluminum alloy or magnesium alloy, etc., to improve the use strength of the cover body 101; as for the insulating piece 102, the insulating piece 102 is used to electrically insulate the cover body 101, to avoid short circuit caused by accidental contact between the cover body 101 and the shell and other components inside the shell; at the same time, the insulating piece 102 can be formed of materials such as plastic or insulating resin, etc., which have good insulation performance, to ensure that the cell has good performance and safety.

[0030] As for the electrode terminal 200, the electrode terminal 200 is arranged on the cover plate assembly 100 and connected with the tab of the motor assembly inside the cell shell, thereby forming a circulating loop of the cell; as shown, Figures 2-4 As shown, the electrode terminal 200 can comprise an integrally formed pole body 201 and a limiting plate 202, wherein the pole body 201 penetrates through the mounting holes 110 of the cover body 101 and the insulating piece 102 respectively, so that both ends of the pole body 201 extend out of the opposite sides of the cover plate assembly 100, i.e. the pole body 201 extends to the inside and outside of the cell, so as to build electrical connection relationship with the tab of the electrode assembly and external equipment respectively through the pole body 201; the limiting plate 202 is located on the side of the insulating piece 102 away from the cover body 101, which can prevent the electrode terminal 200 from being pulled out of the mounting holes 110 of the cover plate assembly 100; in addition, the pole body 201 is in the orthographic projection of the limiting plate 202, and the area of the orthographic projection of the pole body 201 is smaller than that of the limiting plate 202, i.e. the area of the limiting plate 202 is larger than that of the end surface of the pole body 201, to ensure that a large enough welding area can be formed between the limiting plate 202 and the tab during welding, which is conducive to improving the firmness of the limiting plate 202 after welding with the tab, and ensuring the overall quality of the cell.

[0031] More specifically, when the electrode terminal 200 is welded with the tab by laser, or when the battery cell performs a rapid charging task, the electrode terminal 200 will have a significant temperature rise phenomenon, and the heat released is relatively large; in order to prevent the insulation piece 102 from melting due to the temperature of the electrode terminal 200 being too high, a support portion 210 can be protrudingly arranged on one side of the limiting plate 202 close to the cover body 101, and the support portion 210 abuts against the surface of the insulation piece 102, so as to separate the insulation piece 102 from the limiting plate 202 and form a heat insulation gap 220 therebetween. The heat insulation gap 220 can effectively isolate the insulation piece 102 from the limiting plate 202, so as to reduce the heat transfer efficiency therebetween. In addition, due to the existence of the support portion 210 and the greatly reduced heat transfer efficiency between the heat insulation plate and the insulation piece 102, the insulation piece 102 can be prevented from melting at a high temperature, and the aging speed of the insulation piece 102 can be slowed down, so as to ensure the insulation performance of the insulation piece 102, and help to improve the overall performance of the battery cell and the product quality.

[0032] In combination with the above embodiment, the support portion 210 is further described. For example, the support portion 210 can be connected with the limiting plate 202 by adhesion. When the support portion 210 abuts against the surface of the insulation piece 102, the insulation piece 102 and the limiting plate 202 can press the support portion 210, so as to fix the support portion 210 between the limiting plate 202 and the insulation piece 102. In addition, the support portion 210 can be formed of ceramic composite material and silicone rubber material, so as to have good insulation, heat resistance and supporting effect, and ensure that the heat insulation gap 220 has good heat insulation effect. At the same time, the heat conductivity of the material forming the support portion 210 is relatively poor, so as to reduce the heat transfer efficiency between the limiting plate 202 and the insulation piece 102, and prevent the insulation piece 102 from being damaged due to the local temperature being too high.

[0033] In summary, by additionally arranging the support portion 210 on the surface of the limiting plate 202 of the electrode terminal 200, the insulation piece 102 and the limiting plate 202 can be separated and a heat insulation gap 220 can be formed therebetween. The heat insulation gap 220 can block the heat released by the electrode terminal 200 during welding, reduce the heat transfer efficiency between the electrode terminal 200 and the insulation piece 102, prevent the insulation piece 102 from melting at a high temperature and causing damage to the battery cell, ensure the insulation performance of the insulation piece 102, slow down the aging speed of the insulation piece 102, and ensure the overall performance of the battery cell and the product quality.

[0034] In some embodiments, the cross section of the support portion 210 in the thickness direction of the cover body 101 is one of a circle, an ellipse, a semicircle and a polygon; and / or a plurality of support portions 210 are arranged, and the plurality of support portions 210 are distributed in a rectangular shape on the surface of the limiting plate 202.

[0035] The support portion 210 added to the limiting plate 202 can separate the limiting plate 202 and the insulating piece 102, so that a heat insulation gap 220 is formed between the limiting plate 202 and the insulating piece 102. The heat insulation gap 220 can block the heat released by the limiting plate 202, so as to reduce the heat transfer efficiency between the limiting plate 202 and the insulating piece 102, avoid the melting of the insulating piece 102 caused by the high temperature of the electrode terminal 200, and protect the overall performance and quality of the battery cell. Specifically, when the support portion 210 is in a columnar structure, the cross-sectional shape of the support portion 210 in the thickness direction of the cover body 101 can be selected according to actual conditions. For example, in the thickness direction perpendicular to the cover body 101, the cross-section of the support portion 210 can be one of a circle, an ellipse, a semicircle, and a polygon (such as a triangle, a rectangle, a square, and an irregular polygon). The manufacturing precision and forming difficulty of the support portion 210 can be reduced, so as to reasonably control the cost of the battery cell.

[0036] In addition, two electrode terminals 200 can be included in any battery cell, which are used as the positive electrode and the negative electrode of the battery cell. Figure 3 and Figure 4 As shown in the figures, for each electrode terminal 200, a plurality of support portions 210 can be arranged on the side of the limiting plate 202 close to the cover body 101. The plurality of support portions 210 are arranged in a rectangular shape on the surface of the limiting plate 202. When the electrode terminal 200 is assembled to the cover plate assembly 100, the plurality of support portions 210 arranged in a rectangular shape can form a good support effect, so as to ensure that the heat insulation gap 220 formed between the limiting plate 202 and the insulating piece 102 is relatively uniform, and improve the heat blocking performance. In addition, when the electrode terminal 200 is welded with the tab, the plurality of support portions 210 can ensure that the limiting plate 202 of the electrode terminal 200 has good flatness after assembly, which is beneficial to reduce the bending degree of the limiting plate 202, and avoid the quality problems such as virtual welding between the tab and the electrode terminal 200.

[0037] As an alternative embodiment, for the support portion 210, the support portion 210 can also be arranged in a ring shape or a strip shape. Specifically, when the support portion 210 is in a ring shape on the surface of the limiting plate 202, the support portion 210 can be arranged around the pole body 201, and can support the surrounding area of the pole body 201, and can form the same heat insulation gap 220. Similarly, the support portion 210 can also be arranged in a strip shape, and a plurality of groups of strip-shaped support portions 210 can be arranged around the pole body 201, which can support the surrounding area of the pole body 201, and can also form the same heat insulation gap 220. Details are not described herein.

[0038] In some embodiments, the electrode terminal 200 further includes a support boss 203, which is disposed on the same side of the limiting plate 202 and connected to the limiting plate 202, and the surface of the support boss 203 abuts against the side of the insulating member 102 away from the cover 101.

[0039] In addition to the integrally formed electrode post body 201 and the limiting plate 202, the electrode terminal 200 may also include a supporting boss 203; such as Figures 2-4 As shown, the support boss 203 can be disposed on the side of the limiting plate 202 near the cover 101, so that the support boss 203 and the support part 210 are disposed on the same side of the surface of the limiting plate 202, and the support boss 203 is also located between the limiting plate 202 and the insulating member 102. Due to the presence of the support boss 203, and its surface abutting against the side of the insulating member 102 away from the cover 101, it can support the surrounding area of ​​the mounting hole 110 of the insulating member 102, improve the support effect on the limiting plate 202 and the insulating member 102, ensure that the formed heat insulation gap 220 has a uniform thickness and is relatively flat, and ensure that the heat insulation gap 220 can reduce the heat transfer efficiency between the electrode terminal 200 and the insulating member 102, and also ensure that the limiting plate 202 has good flatness after the electrode terminal 200 is installed.

[0040] The supporting boss 203 will be further described in conjunction with the above embodiments. To reduce the manufacturing difficulty of the electrode terminal 200, the electrode post body 201, the limiting plate 202, and the supporting boss 203 can be integrally formed, reducing the cost of the electrode terminal 200. Since the supporting boss 203 is used to support the area around the mounting hole 110 of the insulating component 102, the contact area between the supporting boss 203 and the insulating component 102 is relatively small, and the heat transfer efficiency between them is relatively low, so the thermal impact on the insulating component 102 is relatively low. In addition, to further reduce the heat transfer efficiency between the supporting boss 203 and the insulating component 102, a heat insulation material can be coated on the surface of the supporting boss 203 to improve the protection effect on the insulating component 102.

[0041] In some embodiments, the orthographic projection of the pole post body 201 onto the limiting plate 202 is located within the orthographic projection of the support boss 203 onto the limiting plate 202, and the orthographic projection area of ​​the pole post body 201 is smaller than the orthographic projection area of ​​the support boss 203; and / or along the thickness direction of the cover 101, the height of the support boss 203 is the same as the height of the support portion 210.

[0042] Regarding the electrode terminal 200, by adding a support boss 203 to the limiting plate 202, the periphery of the mounting hole 110 of the insulating component 102 can be supported, so that the thickness of the thermal insulation gap 220 is relatively uniform, reducing the thermal impact of the electrode terminal 200 on the insulating component 102; such as Figures 2-4As shown, by making the orthogonal projection of the pole post body 201 in the limiting plate 202 be located within the orthogonal projection of the support boss 203 in the limiting plate 202, and making the orthogonal projection area of the pole post body 201 be smaller than the orthogonal projection area of the support boss 203, the surface of the support boss 203 can be reserved for the part of the support insulating piece 102, so as to support the support insulating piece 102, and facilitate to improve the stability of the heat insulation gap 220; in addition, the support boss 203 can also provide a support position for the sealing structure of the electrode terminal 200, and ensure the sealing between the cover plate assembly 100 and the electrode terminal 200.

[0043] In addition, for the support boss 203, along the thickness direction of the cover body 101, by setting the height of the support boss 203 to be the same as the height of the support part 210, the uniformity of the formed heat insulation gap 220 can be further improved, and the limiting plate 202 of the electrode terminal 200 has good flatness after installation.

[0044] In some embodiments, the side of the limiting plate 202 away from the cover body 101 is provided with a welding mark 230 for welding the tab to the surface of the limiting plate 202, and the orthogonal projection of the welding mark 230 and the orthogonal projection of the support part 210 in the limiting plate 202 are spaced apart.

[0045] Specifically, please refer to Figure 5 , Figure 5 for a schematic diagram of the distribution of the welding mark 230 on the electrode terminal 200.

[0046] For the battery cell, the shell of the battery cell is provided with an electrode assembly (including a positive electrode sheet, a negative electrode sheet and a separator), and the electrode assembly is connected with the electrode terminal 200 through the tab and constitutes the circuit structure of the battery cell; wherein the tab and the limiting plate 202 of the electrode terminal 200 can be welded and connected by laser, and due to the high energy of the laser, the welding mark 230 can be formed on the side of the limiting plate 202 away from the cover body 101, and the tab is welded to the surface of the limiting plate 202 by using the welding mark 230; as shown in Figure 2 and Figure 5 , when the laser is used to form the welding mark 230, the heat generation is more and the temperature of the welding mark 230 is higher; in order to reduce the heat influence of the welding mark 230 on the insulating piece 102 when the welding mark 230 is formed, by making the orthogonal projection of the welding mark 230 in the limiting plate 202 and the orthogonal projection of the support part 210 in the limiting plate 202 be spaced apart, i.e. the two are mutually away and spaced apart, the heat transferred to the insulating piece 102 by the welding mark 230 can be reduced, and the heat influence degree of the welding mark 230 on the insulating piece 102 can be reduced.

[0047] Exemplarily, the interval between the orthogonal projection of the welding mark 230 in the limiting plate 202 and the orthogonal projection of the support part 210 in the limiting plate 202 can be set to be greater than or equal to 2mm, which will not be repeated here.

[0048] In some embodiments, the welding mark 230 is spaced apart between the orthographic projection of the limiting plate 202 and the orthographic projection of the pole body 201 of the pole body 201.

[0049] As shown in FIG. 1 1 and FIG. 12, the welding mark 230 is spaced apart between the orthographic projection of the limiting plate 202 and the orthographic projection of the pole body 201 of the pole body 201. Figure 2 Figure 5 As shown in FIG. 1 1 and FIG. 12, the welding mark 230 is spaced apart between the orthographic projection of the limiting plate 202 and the orthographic projection of the pole body 201 of the pole body 201.

[0050] For example, the spacing between the welding mark 230 and the orthographic projection of the limiting plate 202 and the orthographic projection of the pole body 201 of the pole body 201 can be set to 10 mm or more, which will not be described here.

[0051] In some embodiments, the cell cover plate further comprises a sealing ring 300, which is nested in the pole body 201 and abuts against one side of the support boss 203 close to the cover 101; the sealing ring 300 is embedded in the mounting hole 1 10 of the cover 101 and the mounting hole 1 10 of the insulating piece 102, so as to separate the pole body 201 from the cover 101 and the insulating piece 102 respectively.

[0052] For the cell cover plate, the pole body 201 of the electrode terminal 200 extends out of the cell, so as to build an electrical connection relationship with external equipment; as shown in FIG. 1 1 and FIG. 12, by arranging the sealing ring 300 in the cell cover plate, and nesting the sealing ring 300 in the pole body 201 and abutting against one side of the support boss 203 close to the cover 101, the support boss 203 supports the sealing ring 300; since the sealing ring 300 is nested in the pole body 201 and embedded in the mounting hole 1 10 of the cover 101 and the mounting hole 1 10 of the insulating piece 102, the sealing ring 300 can separate the pole body 201 from the cover 101 and the insulating piece 102 respectively, so as to avoid the contact between the electrode terminal 200 and the cover 101 and cause the short circuit of the cell, and at the same time, the sealing ring 300 can separate the inner wall of the mounting hole 1 10 of the insulating piece 102 from the pole body 201, which is beneficial to reduce the thermal influence of the pole body 201 on the peripheral area of the mounting hole 1 10 of the insulating piece 102 when the temperature is high. Figure 2 Figure 3 For the cell cover plate, the pole body 201 of the electrode terminal 200 extends out of the cell, so as to build an electrical connection relationship with external equipment; as shown in FIG. 1 1 and FIG. 12, by arranging the sealing ring 300 in the cell cover plate, and nesting the sealing ring 300 in the pole body 201 and abutting against one side of the support boss 203 close to the cover 101, the support boss 203 supports the sealing ring 300; since the sealing ring 300 is nested in the pole body 201 and embedded in the mounting hole 1 10 of the cover 101 and the mounting hole 1 10 of the insulating piece 102, the sealing ring 300 can separate the pole body 201 from the cover 101 and the insulating piece 102 respectively, so as to avoid the contact between the electrode terminal 200 and the cover 101 and cause the short circuit of the cell, and at the same time, the sealing ring 300 can separate the inner wall of the mounting hole 1 10 of the insulating piece 102 from the pole body 201, which is beneficial to reduce the thermal influence of the pole body 201 on the peripheral area of the mounting hole 1 10 of the insulating piece 102 when the temperature is high. ​​

[0053] In some embodiments, the cross-section of the sealing ring 300 is stepped along the thickness direction of the cover 101, and the sealing ring 300 is adapted to the mounting hole 110 of the cover 101 and the mounting hole 110 of the insulating member 102, respectively.

[0054] Regarding the 300 sealing ring, such as Figure 3 As shown, along the thickness direction of the cover 101, by making the cross-section of the sealing ring 300 stepped, and by adapting the sealing ring 300 to the mounting holes 110 of the cover 101 and the mounting holes 110 of the insulating component 102 respectively, when the sealing ring 300 is embedded in the mounting holes 110 of the cover 101 and the insulating component 102, the sealing ring 300 can fully fill the mounting holes 110 of the insulating component 102, thereby improving the sealing effect between the electrode terminal 200 and the mounting holes 110 of the insulating component 102 and the cover 101, and thus improving the overall quality of the battery cell.

[0055] In some embodiments, the cell cover plate further includes an insulating sheet 400 and a fixing part 500. The cover body 101 is provided with a fitting groove 120 communicating with the mounting hole 110 of the cover body 101 on the side away from the insulating member 102. The insulating sheet 400 is embedded in the fitting groove 120. The pole body 201 is disposed through the insulating sheet 400 along the thickness direction of the cover body 101. The fixing part 500 is disposed on the side of the insulating sheet 400 away from the cover body 101. The fixing part 500 has a stepped hole 510. A portion of the pole body 201 is located in the stepped hole 510 and is connected to the fixing part 500 through the portion of the pole body 201 located in the stepped hole 510.

[0056] like Figures 1-3 As shown, the cell cover also includes an insulating sheet 400 and a fixing part 500. For the insulating sheet 400, a fitting groove 120 communicating with the mounting hole 110 of the cover 101 is provided on the side of the cover 101 away from the insulating part 102. The insulating sheet 400 is embedded in the fitting groove 120. When installing the insulating sheet 400, the fitting groove 120 can position the insulating sheet 400, reduce the installation difficulty of the insulating sheet 400, and improve the installation accuracy. Along the thickness direction of the cover 101, the electrode body 201 is provided through the insulating sheet 400 to ensure that the electrode body 201 can extend to the outside of the cell. The insulating sheet 400 can be formed of plastic or insulating resin material to ensure the performance and safety of the cell.

[0057] Regarding the fixed part 500, such as Figures 1-3As shown, the fixing portion 500 is arranged at the side of the insulating sheet 400 away from the cover body 101, and the insulating sheet 400 is located between the cover body 101 and the fixing portion 500, so as to electrically isolate the cover body 101 and the fixing portion 500, and prevent the fixing portion 500 from contacting the cover body 101 to cause the short circuit of the battery cell; in addition, the fixing portion 500 is provided with a stepped hole 510, and part of the pole body 201 is located in the stepped hole 510, and the pole body 201 is connected with the fixing portion 500 through the part of the pole body 201 located in the stepped hole 510; wherein the part of the pole body 201 located in the stepped hole 510 can be upset by using riveting technology, so as to be clamped in the stepped hole 510 through the upset part of the pole body 201, so that the end of the fixing portion 500 and the pole body 201 are connected, so that the electrode terminal 200 is electrically connected with the external device through the fixing portion 500.

[0058] In addition, the cover plate assembly 100 is also respectively provided with a liquid injection hole and a pressure relief valve (both are marked in the figure), the liquid injection hole can be used to supplement the electrolyte in the battery cell, and the safety valve can be used for safety pressure relief when the battery cell is abnormal, which will not be described here.

[0059] Based on the same inventive concept, the application also provides a battery cell, which comprises the battery cell cover plate described in any one of the above embodiments; specifically, since the battery cell has the battery cell cover plate described in the above embodiments, the battery cell has all the advantages and beneficial effects of the battery cell cover plate in the above embodiments, which will not be described here.

[0060] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope (including claims) of the application is limited to these examples; under the idea of the application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the application as described above, which are not provided in details for the sake of brevity.

[0061] The embodiments of the application are intended to cover all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Accordingly, any one of the above-described alternatives, modifications, equivalents, improvements, etc., should be included within the scope of the application.

Claims

1. An electrode cover plate, characterized by, The application relates to a cover plate assembly for a battery cell, comprising: a cover plate assembly, comprising a cover body and an insulating piece arranged in a stack, the cover body and the insulating piece are provided with mounting holes; an electrode terminal, comprising an integral pole body and a limiting plate, the pole body penetrates the mounting holes of the cover body and the insulating piece respectively, and the limiting plate is located on the side of the insulating piece away from the cover body; a supporting portion is protrudingly arranged on the side of the limiting plate close to the cover body, and the supporting portion abuts against the insulating piece to separate the insulating piece from the limiting plate and form a heat insulation gap therebetween.

2. The cell cover plate of claim 1, wherein, The supporting portion is provided with a plurality of supporting portions which are distributed in a rectangular shape on the surface of the limiting plate; and / or The cross section of the supporting portion in the thickness direction of the cover body is one of a circle, an ellipse, a semicircle and a polygon.

3. The cell cover plate of claim 1, wherein, The electrode terminal further comprises: a supporting boss which is arranged on the same side of the limiting plate as the supporting portion and is connected with the limiting plate; the surface of the supporting boss abuts against the side of the insulating piece away from the cover body.

4. The cell cover plate of claim 3, wherein, The orthogonal projection of the pole body on the limiting plate is located within the orthogonal projection of the supporting boss on the limiting plate, and the orthogonal projection area of the pole body is smaller than the orthogonal projection area of the supporting boss; and / or The height of the supporting boss is the same as the height of the supporting portion in the thickness direction of the cover body.

5. The cell cover plate of claim 1, wherein, The side of the limiting plate away from the cover body is provided with a welding mark for welding a tab on the surface of the limiting plate, and there is a gap between the orthogonal projection of the welding mark on the limiting plate and the orthogonal projection of the supporting portion on the limiting plate.

6. The cell cover plate of claim 5, wherein, There is a gap between the orthogonal projection of the welding mark on the limiting plate and the orthogonal projection of the pole body on the limiting plate.

7. The cell cover plate of claim 4, wherein, Further comprising, a sealing ring which is nested in the pole body and abuts against the side of the supporting boss close to the cover body; the sealing ring is embedded in the mounting hole of the cover body and the mounting hole of the insulating piece to separate the pole body from the cover body and the insulating piece respectively.

8. The cell cover plate of claim 7, wherein, In the thickness direction of the cover body, the cross section of the sealing ring is stepped, and the sealing ring is adapted to the mounting hole of the cover body and the mounting hole of the insulating piece respectively.

9. The cell cover plate of claim 1, wherein, Further comprising: an insulating sheet, the side of the cover body away from the insulating piece is provided with a fitting groove which is in communication with the mounting hole of the cover body, and the insulating sheet is embedded in the fitting groove, and in the thickness direction of the cover body, the pole body penetrates the insulating sheet; a fixing portion which is arranged on the side of the insulating sheet away from the cover body; the fixing portion is provided with a stepped hole, and part of the pole body is located in the stepped hole and is connected with the fixing portion through the part of the pole body located in the stepped hole.

10. An electric cell characterized by The application further relates to a battery cell cover plate comprising any one of the cover plate assemblies according to claims 1-9.

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