Battery cover plate and battery

Abstract

The application discloses a battery cover plate and a battery. The battery comprises a shell, a roll core arranged in the shell and a battery cover plate. The battery cover plate is used for packaging the roll core in the shell. The battery cover plate comprises a cover plate body provided with a first connecting part and a second connecting part. The first connecting part is protruded from the cover plate body at a position corresponding to the roll core, and is used for electrically connecting with a tab of the roll core. The second connecting part is arranged at an edge of the cover plate body, and is used for electrically connecting with the shell. The battery cover plate in the embodiment of the application can make the axial space utilization rate of the battery high, and further improve the energy density of the battery. In addition, the positioning and welding processes of a connecting piece in the battery assembling process are omitted, the battery mounting process steps are simplified, and the battery production efficiency is improved.

Description

TECHNICAL FIELD

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

[0002] As one of the core components of new energy vehicles, lithium ion batteries have become the mainstream of power batteries due to their high energy density, long cycle life, safety and reliability and other technical advantages. With the improvement of power performance requirements and the development of lithium ion battery technology, cylindrical batteries, especially large cylindrical batteries, have gradually developed into the mainstream direction due to their simple structure, easy grouping, and the advantage of applying high energy density materials.

[0003] The structure of the cylindrical battery generally includes a winding core, a tab, a pole, a shell, a transition piece and a bottom cover. The tab is arranged on the winding core, and the tab is connected with the transition piece, and then connected with the pole and the shell to lead out the current. Then the battery is packaged through the bottom cover. Since the transition piece has tolerances in generation and installation, an installation height needs to be reserved between the bottom cover and the transition piece. This installation causes waste of the axial space of the battery, reducing the energy density of the battery. SUMMARY

[0004] The main purpose of the present application is to provide a battery cover plate and a battery, which aims to improve the utilization rate of the axial space of the battery, improve the energy density of the battery, simplify the battery assembly process, and improve the battery generation efficiency.

[0005] The present application provides a battery cover plate for a battery, the battery comprising a shell and a winding core arranged in the shell, the battery cover plate being used for packaging the winding core in the shell, the battery cover plate comprising:

[0006] a cover plate body, the cover plate body being provided with a first connecting part and a second connecting part;

[0007] The first connecting part is protruded at a position corresponding to the winding core of the cover plate body, and is used for electrically connecting with the tab of the winding core; the second connecting part is arranged at the edge of the cover plate body, and is used for electrically connecting with the shell.

[0008] Optionally, at least two first connecting parts are arranged on the cover plate body, and the first connecting parts are arranged at intervals.

[0009] Optionally, the gap between the two adjacent first connecting parts is 2mm-20mm.

[0010] Optionally, the battery is a cylindrical battery, the cover plate body is circular, and the first connecting parts are uniformly distributed along the circumference of the cover plate body.

[0011] Optionally, the battery cover plate further comprises a support frame arranged on the side of the cover plate body facing the tab, the support frame is provided with a through hole for the first connecting part to pass through, so that the first connecting part protrudes from the support frame and is connected with the tab.

[0012] Optionally, the support frame comprises a first support body, a second support body and at least two connecting bodies, the second support body is located in the inner ring of the first support body, the connecting bodies are connected between the first support body and the second support body; the first support body, the second support body and the adjacent two connecting bodies enclose the through hole;

[0013] The side of the first connecting part facing the second connecting part is the outer side, and the opposite side of the outer side is the inner side, the first support body is installed on the outer side of the first connecting part, the second support body is installed on the inner side of the first connecting part, and the connecting body is installed in the gap between the adjacent two first connecting parts.

[0014] Optionally, a first groove is formed between the first connecting part and the second connecting part, and the first support body is installed in the first groove.

[0015] Optionally, the cover plate body is further provided with a sink protruding towards the winding core, the sink is provided with a liquid injection hole; a second groove is formed between the sink and the first connecting part, and the second support body is installed in the second groove.

[0016] Optionally, the support frame is welded or riveted with the cover plate body.

[0017] Optionally, the outer side of the first groove is provided with a pressure relief part, and the pressure relief part is arranged in a staggered manner with the first support body.

[0018] Optionally, the cover plate body is further provided with a mounting positioning groove, the opening of the mounting positioning groove faces the opposite direction of the protruding direction of the first connecting part, and the mounting positioning groove is located at the second connecting part.

[0019] Optionally, the cover plate body is integrally formed by a conductive plate.

[0020] The application further provides a battery, which comprises a shell, a winding core arranged in the shell and the battery cover plate as described above.

[0021] The winding core is arranged in the shell, the first connecting part of the battery cover plate abuts against the tab of the winding core, and the second connecting part of the battery cover plate abuts against the shell, so as to package the winding core in the shell.

[0022] To achieve the above objectives, the present invention provides a battery cover and a battery. In this embodiment, the battery cover includes a cover body, which has a first connecting portion and a second connecting portion. The first connecting portion protrudes from the cover body, and the second connecting portion is disposed at the edge of the cover body. The battery cover is used to encapsulate the battery core within the battery casing. Based on the protrusion of the first connecting portion, the battery cover, after being installed, connects to the tabs on the core. The battery cover allows current from the tabs to be led out to the casing, while simultaneously encapsulating the core. Thus, the battery cover in this embodiment replaces the adapter plate design between the tabs and the casing, eliminating the need for axial adapter plate space inside the battery, improving space utilization, and thereby increasing battery energy density. Furthermore, eliminating the adapter plate simplifies the battery assembly process by eliminating the positioning and welding processes required for the adapter plate, thus improving battery production efficiency. Attached Figure Description

[0023] Figure 1 A schematic diagram of the inner structure of a battery cover plate according to an embodiment of the present invention is provided;

[0024] Figure 2 A schematic diagram of the outer structure of a battery cover plate according to an embodiment of the present invention is provided;

[0025] Figure 3 A schematic diagram of the inner structure of the battery cover plate according to another embodiment of the present invention is provided;

[0026] Figure 4 A schematic diagram of the outer structure of the battery cover plate according to another embodiment of the present invention is provided;

[0027] Figure 5 An exploded view of a battery cover according to another embodiment of the present invention is provided;

[0028] Figure 6 for Figure 5 A schematic diagram of the assembly of the battery cover;

[0029] Figure 7 This is a schematic diagram of the support frame in the battery cover provided by the present invention.

[0030] Figure 8 This is a partial cross-sectional schematic diagram of the battery provided by the present invention.

[0031] Labels and explanations:

[0032]

[0033]

[0034] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] It should be understood that the specific embodiments described herein are merely exemplary and do not limit the scope of the application.

[0036] The related cylindrical battery structure generally includes a winding core, a tab, a pole, a shell, a transition piece and a bottom cover. The tab is arranged at two ends of the winding core. The tab is connected with the transition piece, and then connected with the pole and the shell to lead out the current. That is, the tab, the pole and the shell are connected through the transition piece. Then the winding core, the tab, the pole and the transition piece are packaged in the shell through the bottom cover. However, it is found in the actual manufacturing process of such a battery that because there is a tolerance in the generation and installation of the transition piece, an installation height needs to be reserved between the bottom cover and the transition piece. This installation causes the waste of the axial space of the battery and reduces the energy density of the battery.

[0037] Based on this, the battery cover plate provided by the embodiments of the application is used to replace the transition piece and directly connect with the tab and the shell, so that the setting of the transition piece is reduced, the axial reserved space between the transition piece and the bottom cover is saved, the utilization rate of the axial space of the battery is improved, and the energy density of the battery is improved. In addition, the setting of the transition piece is saved, and the positioning, welding and other process steps of the transition piece in the battery assembly process are simplified, and the production efficiency of the battery is improved.

[0038] In order to better understand the above technical solutions, the exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0039] Please refer to Figure 1 , Figure 2 and Figure 4 An embodiment of the present application provides a battery cover plate. The battery cover plate 110 is used for a battery, especially a cylindrical battery. The battery includes a shell 200 and a winding core 300 arranged in the shell 200. The winding core 300 is provided with a tab and a pole at two ends. The pole is located on the axis of the winding core 300. The tab is distributed along the circumference of the winding core 300. The battery cover plate 110 is used to connect the tab and the shell 200, and to package the winding core 300 in the shell 200, to complete the current output and packaging of the battery. That is, the transition piece is not needed to be arranged between the tab and the shell 200 by specially arranging the battery cover plate 110. The specific structure of the battery cover plate 110 can be referred to the following embodiments.

[0040] Optionally, in the embodiment, the battery cover plate 110 comprises a cover plate body 110, the cover plate body 110 is provided with a first connecting part 111 and a second connecting part 112, the first connecting part 111 is used for electrical connection with the tab, and the second connecting part 112 is used for electrical connection with the shell 200, so as to realize the connection of the tab and the shell 200 while the battery is packaged.

[0041] The first connecting part 111 is protruded at the position corresponding to the winding core 300 of the cover plate body 110, so that when the cover plate body 110 packages the shell 200, the protruding first connecting part 111 can abut against the tab on the winding core 300, and electrical connection with the tab is realized. It should be noted that the first connecting part 111 is protruded along the thickness direction of the cover plate body 110, for example, the thickness direction of the cover plate body 110 is the same as the axial direction of the shell 200, the first connecting part 111 is protruded along the axial direction of the shell 200, and the tab on the winding core 300 extends along the axial direction, so that when the battery cover plate 110 is installed, the first connecting part 111 and the tab abut against each other.

[0042] The second connecting part 112 is arranged at the edge of the cover plate body 110, and when the cover plate body 110 packages the shell 200 of the battery, the second connecting part 112 realizes electrical connection with the shell 200 and seals the shell 200. It should be noted that the second connecting part 112 extends from the edge of the cover plate body 110 to the width direction (radial direction of the cover plate body 110 of the cylindrical battery) of the cover plate body 110. The second connecting part 112 abuts against the shell 200.

[0043] Optionally, the specific structure of the battery cover plate 110 is described in combination with the installation process of the battery cover plate 110 on the battery. For example, at least one end of the shell 200 of the battery is open, which needs to be packaged by the battery cover plate 110, the winding core 300 is put into the shell 200, and the tabs at both ends of the winding core 300 face the opening, and the shell 200 is packaged by the battery cover plate 110. One side of the battery cover plate 110 provided with the first connecting part 111 faces the inside of the shell 200, that is, faces the winding core 300, and the second connecting part 112 of the battery cover plate 110 abuts against the shell 200 at the edge of the opening. When the battery cover plate 110 is installed in place, the first connecting part 111 abuts against the tab on the winding core 300. The battery cover plate 110 is made of conductive material, so that the winding core 300 transmits current to the battery cover plate 110 through the tab, and the battery cover plate 110 transmits current to the shell 200, realizing the leading-out of current.

[0044] Optionally, in the embodiment, the first connecting part 111 is in contact with the tab. The second connecting part 112 and the shell 200 can be in embedded connection, such as interference fit, to realize the connection between the cover plate body 110 and the shell 200; or the second connecting part 112 and the shell 200 can be welded and fixed; or the second connecting part 112 can also be clamped with the shell 200, such as the second connecting part 112 being provided with a clamping groove 1211 (referring to FIG. 12), and the clamping groove 1211 being clamped on the shell 200. Figure 3

[0045] In some optional embodiments, the cover plate body 110 is provided with at least two first connecting parts 111 according to requirements, and the first connecting parts 111 are arranged at intervals. For example, in some embodiments, the tabs on the roll core 300 are divided into multiple current zones, and multiple first connecting parts 111 are arranged, and each first connecting part 111 is connected with the tabs on at least one current zone. Optionally, the gap between two adjacent first connecting parts 111 is 2mm-20mm, so that the first connecting part 111 can cover all the tabs and can be connected with all the tabs while realizing the lead-out of the current partition.

[0046] Optionally, when the battery is a cylindrical battery, the cover plate body 110 is circular, and the first connecting parts 111 are uniformly distributed along the circumference of the cover plate body 110 to uniformly lead out the current of the roll core 300. Optionally, the first connecting parts 111 are arranged in the form of a sector to adapt to the distribution of the tabs on the roll core 300, improve the adaptability of the cover plate body 110 to the tabs, and further improve the connection performance of the tabs to the cover plate body 110. For example, the first connecting parts 111 are 3-6.

[0047] Optionally, the side of the first connecting part 111 towards the axis is the inner side, the side of the first connecting part 111 towards the second connecting part 112 is the outer side, and the first connecting part 111 has a gap between the inner sides. In some optional embodiments, the cover plate body 110 is further provided with a liquid injection hole 115, and the liquid injection hole 115 is arranged in the gap between the inner sides of the first connecting part 111. Optionally, in order to facilitate the sealing of the liquid injection hole 115, a sink 114 towards the roll core 300 is arranged in the gap, and the liquid injection hole 115 is arranged on the sink 114, so that the sealing of the liquid injection hole 115 can be realized by the height of the sink 114, such as arranging a sealing plug and the like.

[0048] Optionally, in other embodiments, the liquid injection hole 115 can also be arranged at other positions.

[0049] ​In some optional embodiments, the first connecting part 111 has a protruding height of 0.5mm-5mm relative to the cover plate body 110, so as to avoid that the first connecting part 111 occupies too much space in the axial direction of the battery, while ensuring that the first connecting part 111 can contact the tab of the roll core 300 inside the battery.

[0050] In the embodiment, the battery cover plate 110 comprises a cover plate body 110, the cover plate body 110 is provided with a first connecting part 111 and a second connecting part 112, the first connecting part 111 is protruded from the cover plate body 110, and the second connecting part 112 is arranged at the edge of the cover plate body 110. The battery cover plate 110 is used for packaging the roll core 300 of the battery in the shell 200 of the battery, and based on the protruding arrangement of the first connecting part 111, the battery cover plate 110 is connected to the tab on the roll core 300 after being installed in place, so as to realize that the current on the tab is led out to the shell 200 through the battery cover plate 110, and the packaging of the roll core 300 is realized. In this way, the battery cover plate 110 of the embodiment replaces the adapter sheet design between the tab and the shell 200, saves the reserved space of the adapter sheet in the axial direction of the battery, improves the space utilization, and further improves the energy density of the battery. In addition, the setting of the adapter sheet is saved, and the positioning, welding and other processes of the adapter sheet in the battery assembly process are saved, so as to simplify the battery installation process steps and improve the battery production efficiency.

[0051] Please refer to Figures 5 to 7 , and in combination with Figures 1 to 4 , another embodiment of the present application provides a battery cover plate 110, which is also used for packaging of the battery, and the specific structure is substantially the same as that of the above-mentioned embodiments. In addition, the battery cover plate 110 is different from the above-mentioned embodiments in that the battery cover plate 110 further comprises a support frame 120, the support frame 120 is arranged on the side of the cover plate body 110 facing the tab, the support frame 120 is provided with a through hole 124, the first connecting part 111 passes through the through hole 124, so that the first connecting part 111 protrudes from the support frame 120 and is connected with the tab.

[0052] That is to say, in the embodiment, the battery cover plate 110 further comprises a support frame 120 arranged on the inner side of the cover plate body 110. The support frame 120 is welded or riveted with the cover plate body 110. When the cover plate body 110 is broken due to thermal runaway of the battery, causing the roll core 300 inside the battery to be ejected outward, the support frame 120 is inside the cover plate body 110, which can not only increase the thickness of the cover plate body 110, so that the cover plate body 110 except for the pressure relief part 118 is not easy to be broken, but also the support frame 120 plays a blocking role, so that under the condition of thermal runaway of the battery, the support frame 120 can prevent the roll core 300 inside the battery from being ejected in large volume, thereby improving the use safety of the battery pack.

[0053] The support frame 120 is arranged on the inner side of the cover plate body 110. If a large pressure is generated inside the battery, the support frame 120 can increase the rigidity of the battery cover plate 110, and at the same time, the cover plate body 110 can also provide a limiting force for the support frame 120. In this way, the support frame 120 plays a better reinforcing role. In addition, the support frame 120 is provided with a through hole 124, so that the first connecting part 111 on the cover plate body 110 passes through the through hole 124 to realize connection with the tab, and the support frame 120 will not affect the connection between the cover plate body 110 and the tab.

[0054] Optionally, in the embodiment, the protrusion height of the first connecting part 111 on the cover plate body 110 is greater than the thickness of the support frame 120.

[0055] Optionally, in some embodiments, if the cover plate body 110 is provided with at least two first connecting parts 111, the support frame 120 can be provided with a through hole 124 through which at least two first connecting parts 111 pass. The support frame 120 can also be provided with at least two through holes 124, each of which corresponds to a first connecting part 111, for example, when the first connecting part 111 is provided with 3-6, the corresponding through hole 124 includes 3-6.

[0056] Optionally, in the embodiment, the support frame 120 includes a first support body 121, a second support body 122, and at least two connecting bodies 123. The first support body 121 is annular, and the second support body 122 is also annular. The second support body 122 is located in the inner ring of the first support body 121 and is arranged in a spaced manner with the first support body 121. The connecting body 123 is between the first support body 121 and the second support body 122, and connects the first support body 121 and the second support body 122. The first support body 121, the second support body 122, and the adjacent two connecting bodies 123 enclose the through hole 124. By arranging a plurality of connecting bodies 123 between the first support body 121 and the second support body 122, a plurality of through holes 124 are arranged on the support frame 120.

[0057] The cover plate body 110 is provided with a mounting space corresponding to the support frame 120, so that the support frame 120 is compactly mounted with the cover plate body 110. In the embodiment, the cover plate body 110 is provided with a mounting space based on the mechanism of the support frame 120. For example, in one possible implementation, the side of the first connecting part 111 towards the second connecting part 112 is an outer side, the opposite side of the outer side is an inner side, the first support body 121 is mounted on the outer side of the first connecting part 111, the second support body 122 is mounted on the inner side of the first connecting part 111, and the connecting body 123 is mounted in the gap between two adjacent first connecting parts 111. Based on the protrusion of the first connecting part 111 from the cover plate body 110, the support frame 120 can be clamped around the first connecting part 111. In the implementation, the support frame 120 can be limited by the first connecting part 111.

[0058] In another possible implementation, in order to further limit the support frame 120 and improve the stability of the support frame 120, a first groove 113 is formed between the first connecting part 111 and the second connecting part 112, and the first support body 121 is mounted in the first groove 113. Alternatively, a boss can be provided on the second connecting part 112 to form the first groove 113 with the first connecting part 111, and the first groove 113 limits the first support body 121.

[0059] In the embodiment, a sink 114 provided with a liquid injection hole 115 is arranged on the central axis of the cover plate body 110, that is, on the inner side of the first connecting part 111. The sink 114 protrudes towards the winding core 300, that is, the protruding direction of the sink 114 is the same as the protruding direction of the first connecting part 111. The protruding part of the sink 114 forms a second groove 116 with the first connecting part 111, and the second support body 122 is mounted in the second groove 116. The second groove 116 limits the second support body 122.

[0060] Alternatively, in the riveting implementation of the support frame 120 and the cover plate body 110, a connecting hole 125 is arranged on the support frame 120, and the connecting hole 125 is used for riveting and fixing with the cover plate body 110. Alternatively, the connecting hole 125 is arranged on the first support body 121 and uniformly distributed around the first support body 121.

[0061] In the embodiment, the battery cover plate 110 replaces the structure of the connecting sheet through the structural arrangement of the cover plate body 110 and the support frame 120, and the support frame 120 can be arranged compactly with the cover plate body 110, without reserving installation space for the support frame 120. In addition, the support frame 120 is arranged at the inner side of the cover plate body 110, which can prevent the large volume of the jelly-roll 300 inside the battery from being ejected, and improve the use safety in the battery pack.

[0062] Optionally, in some embodiments, the cover plate body 110 is further provided with a pressure relief portion 118, which is arranged at the outer side of the first groove body 113. The pressure relief portion 118 is used to relieve the pressure outside when the pressure inside the battery is too large. Optionally, the pressure relief portion 118 is a score line or a tie groove. When the pressure inside the battery is too large, the score line on the cover plate body 110 is first broken, and the jelly-roll 300 or the pressure is discharged from the broken part, so as to relieve the pressure. The pressure relief portion 118 is arranged in a staggered manner with the support frame 120, especially with the first support body 121, so as to avoid the influence of the first support body 121 on the fracture and pressure relief of the pressure relief portion 118. The support frame 120 is arranged around the pressure relief portion 118, and supports the cover plate body 110 around the pressure relief portion 118, so as to prevent most of the jelly-roll 300 from being ejected outward when the broken part of the cover plate body 110 is too large.

[0063] Optionally, in some embodiments, the cover plate body 110 is further provided with a mounting positioning groove 117, the opening of the mounting positioning groove 117 is opposite to the protruding direction of the first connecting portion 111, and the mounting positioning groove 117 is located at the second connecting portion 112. In the embodiment, the mounting positioning groove 117 is arranged on the cover plate body 110, and the positioning and installation of the cover plate body 110 are realized through the mounting positioning groove 117.

[0064] Optionally, the mounting positioning groove 117 can be a groove recessed on the cover plate body 110. Alternatively, the cover plate body 110 can be recessed from the outer side to the inner side. Optionally, the cover plate body 110 is recessed to the inner side, and a boss is formed at the inner side of the cover plate body 110. The boss and the first connecting portion 111 form the first groove body 113, and the second connecting portion 112 does not need to be additionally provided with a boss in this embodiment.

[0065] Optionally, in order to improve the reliability of the electrical connection between the first connecting portion 111 and the tab of the jelly-roll 300, the protruding height of the boss is less than the protruding height of the first connecting portion 111, and the recessing height of the sunken portion 114 to the inner side of the cover plate body 110 is less than the protruding height of the first connecting portion 111.

[0066] Optionally, in some embodiments, the cover plate body 110 is integrally formed by a conductive plate material, wherein the first groove 113, the mounting positioning groove 117, the second groove 116 and the sunken platform 114 are formed by stamping and bending the conductive plate material, and the production efficiency of the cover plate body 110 is high.

[0067] Please refer to Figure 8 , and in combination with Figures 1 to 7 , the embodiment of the present application also provides a battery, which comprises a shell 200, a roll core 300 arranged in the shell 200 and a battery cover plate 110. Wherein the battery cover plate 110 comprises a cover plate body 110 provided with a first connecting part 111 and a second connecting part 112, the roll core 300 is arranged in the shell 200, the first connecting part 111 of the battery cover plate 110 abuts against the tab of the roll core 300, and the second connecting part 112 of the battery cover plate 110 abuts against the shell 200, so as to realize the packaging of the battery and the connection of the tab and the shell 200.

[0068] In the embodiment, since the battery comprises the battery cover plate 110 described in the above embodiments, the battery in the embodiment has the effects of the battery cover plate 110 described in the above embodiments, and thus will not be described here.

[0069] It should be noted that the above is only an optional embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery cover, characterized in that, For a battery, the battery includes a housing (200) and a core (300) disposed within the housing (200), the battery cover (100) being used to encapsulate the core (300) within the housing (200), the battery cover (100) comprising: The cover plate body (110) is provided with a first connecting part (111) and a second connecting part (112). The first connecting part (111) protrudes from the cover plate body (110) at the position corresponding to the core (300) and is used for electrical connection with the tab of the core (300); the second connecting part (112) is disposed on the edge of the cover plate body (110) and is used for electrical connection with the housing (200). The battery cover (100) also includes a support frame (120), which is disposed on the side of the cover body (110) facing the electrode tab. The support frame (120) is welded or riveted to the cover body (110). The support frame (120) is provided with a through hole (124) through which the first connecting part (111) passes, so that the first connecting part (111) protrudes from the support frame (120) and connects to the electrode tab. The protrusion height of the first connecting part (111) is greater than the thickness of the support frame (120). The support frame (120) includes a first support body (121), a second support body (122), and at least two connecting bodies (123). The second support body (122) is located in the inner ring of the first support body (121), and the connecting bodies (123) are located between the first support body (121) and the second support body (122), connecting the first support body (121) and the second support body (122). The first support body (121), the second support body (122), and the two adjacent connecting bodies (123) form the through hole (124).

2. The battery cover as described in claim 1, characterized in that, The cover plate body (110) is provided with at least two first connecting parts (111), and the first connecting parts (111) are spaced apart; Alternatively, the cover plate body (110) is provided with at least two first connecting parts (111), the first connecting parts (111) are spaced apart, and the gap between two adjacent first connecting parts (111) is 2mm~20mm.

3. The battery cover as described in claim 2, characterized in that, The battery is a cylindrical battery, the cover plate body (110) is circular, and the first connecting part (111) is evenly distributed along the circumference of the cover plate body (110).

4. The battery cover as described in claim 1, characterized in that, The side of the first connecting part (111) facing the second connecting part (112) is the outer side, and the side opposite to the outer side is the inner side. The first support (121) is installed on the outer side of the first connecting part (111), the second support (122) is installed on the inner side of the first connecting part (111), and the connecting body (123) is installed in the gap between two adjacent first connecting parts (111).

5. The battery cover as described in claim 4, characterized in that, A first groove (113) is formed between the first connecting part (111) and the second connecting part (112), and the first support (121) is installed in the first groove (113).

6. The battery cover as described in claim 4, characterized in that, The cover plate body (110) is also provided with a recessed platform (114) protruding towards the core (300), and the recessed platform (114) is provided with a liquid injection hole (115); a second groove (116) is formed between the recessed platform (114) and the first connecting part (111), and the second support (122) is installed in the second groove (116).

7. The battery cover as described in claim 5, characterized in that, The first tank (113) has a pressure relief part (118) on its outer side, and the pressure relief part (118) is offset from the first support body (121).

8. The battery cover as described in claim 1, characterized in that, The cover plate body (110) is also provided with a mounting positioning groove (117), the opening of the mounting positioning groove (117) is opposite to the protrusion direction of the first connecting part (111), and the mounting positioning groove (117) is located in the second connecting part (112).

9. A battery, characterized in that, The battery includes a housing (200), a winding core (300) disposed within the housing (200), and a battery cover (100) as described in any one of claims 1-8. The core (300) is disposed inside the housing (200), the first connecting part (111) of the battery cover (100) abuts against the tab of the core (300), and the second connecting part (112) of the battery cover (100) abuts against the housing (200) to encapsulate the core (300) inside the housing (200).

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