Battery cover plate with power-off protection function and lithium battery

Abstract

The application relates to the technical field of battery cover plates, in particular to a battery cover plate with a power-off protection function and a lithium battery. The battery cover plate comprises a cover plate body, a positive pole post, a negative pole post and a turnover piece. The bottom of the turnover piece is provided with a turnover part contact end which can slide in the height direction. The bottom end of the positive pole post or / and the negative pole post is provided with a boss, the boss is rotatably connected with a contact piece, a tension spring is further arranged between the boss and the contact piece, the contact piece keeps a fixed included angle with the boss under the action of the tension spring, the turnover part contact end is located below the contact piece and a gap exists between the turnover part contact end and the contact piece, the turnover part contact end drives the contact piece to rotate and changes the fixed included angle after being slid upward. The lithium battery comprises a shell, a battery cell and the above-mentioned battery cover plate. The power-off operation of the cover plate is adjusted from the traditional pulling of the welding point or the melting of the low-melting-point alloy to the mechanical structure, so that the trigger is rapid, sensitive and reliable, the structure is simple, the processing cost is low and the installation is convenient.

Description

Technical Field

[0001] This invention relates to the field of battery cover technology, and in particular to a battery cover with power failure protection function and a lithium battery. Background Technology

[0002] Currently, square aluminum-cased lithium-ion batteries are used in numerous fields, providing great convenience for people's production and daily life. To ensure the safe use of square aluminum-cased lithium-ion batteries and prevent potential safety accidents, existing technology incorporates a flip-plate on the battery cover. When the battery experiences punctures, overcharging, or other malfunctions, a large amount of gas is generated inside the battery. This gas pressure triggers the flip-plate, connecting it to a conductive block and thus connecting the positive and negative terminals. This short-circuit discharge stops the battery, preventing further pressure buildup and protecting it. Simultaneously, to prevent gas generation during hot chamber or high-temperature storage testing from triggering the flip-plate and causing a continuous discharge between the positive and negative terminals, potentially leading to combustion within the test chamber, researchers have incorporated solder joints or low-melting-point alloys at the contact points of the flip-plate to delay its activation. This prevents excessive current after the flip-plate is triggered, which could cause battery testing failure. The design of solder joints or low-melting-point alloys can protect battery safety to a certain extent, and the triggering of excessive discharge of the positive and negative terminals can be terminated by breaking the solder joints or melting the low-melting-point alloys. However, because the force required to break the solder joints or low-melting-point alloys cannot be precisely controlled, the triggering timing is uncontrollable. Furthermore, the solder joints can easily affect the sealing of the flip-over tabs, causing frequent malfunctions such as accidental or non-contact operation of the flip-over mechanism. In addition, low-melting-point alloys involve the combination of two or more materials, making them difficult to process. Moreover, dripping low-melting-point alloys from the tabs can easily cause short circuits in the cells, becoming a contributing factor to battery failure.

[0003] Therefore, this application is submitted. Summary of the Invention

[0004] In view of the deficiencies pointed out in the background art, the present invention provides a battery cover plate and a lithium battery with power failure protection function.

[0005] This invention is implemented as follows:

[0006] On one hand, the present invention proposes a battery cover with power failure protection function, comprising:

[0007] Cover plate body;

[0008] Positive electrode post, the positive electrode post is fixed to one end of the cover plate body;

[0009] The negative terminal is fixed to the other end of the cover plate body;

[0010] A flipping component is fixedly connected to the cover plate body and has a flipping contact end that can slide along the height direction at the bottom.

[0011] A boss is provided at the bottom of the positive terminal post and / or the negative terminal post. A contact is rotatably connected to the boss. A tension spring is also provided between the boss and the contact. The contact maintains a fixed angle with the boss under the action of the tension spring.

[0012] The flip-up contact end is located below the contact and there is a gap between them. After the flip-up contact end slides upward, it drives the contact to rotate and changes the fixed angle. Both the boss and the contact are conductive.

[0013] Preferably, the negative electrode post includes a negative electrode post body, and the bottom part of the negative electrode post body extends to form a boss.

[0014] In a further preferred embodiment, the boss is fixed with a rotating shaft in the transverse direction and a tension spring shaft in the longitudinal direction. One end of the contact member is provided with two hooks, and the opposite end is provided with a contact part. The contact member is rotatably connected to the rotating shaft through the hooks. When the contact member rotates, it contacts the contact end of the flipping part through the contact part.

[0015] More preferably, the contact end of the flipping part is a flat sheet structure, and the contact part is an arc-shaped sheet structure, with a height difference of 5 mm or more between the lowest point of the flat sheet structure and the arc-shaped sheet structure.

[0016] In a further preferred embodiment, the contact element is also provided with a hanging hole, which is located in the middle of the end of the contact element where the hook is provided, and one end of the tension spring is connected to the hanging hole and the other end is connected to the tension spring shaft.

[0017] More preferably, the flipping component includes a first connecting piece, a second connecting piece, a flipping part, and a connecting post. The first connecting piece and the second connecting piece are fixedly connected to the connecting post from high to low. The cover plate body is provided with a flipping component mounting hole. The circular plate structure is fixed to the outer periphery of the cylindrical structure. The first connecting piece and the second connecting piece are seamlessly welded to the upper and lower parts of the flipping component mounting hole, respectively. The top of the flipping part is provided with a flipping part connecting end. The flipping part is slidably connected to the connecting post through the flipping part connecting end.

[0018] More preferably, both the first connecting piece and the second connecting piece are concave circular structures, and the connecting post is a cylindrical structure.

[0019] More preferably, the flipping part connecting end and the flipping part contact end are an integrated structure, and the flipping part contact end and the connecting post are L-shaped.

[0020] More preferably, the cover plate body includes a base plate and an injection molded part; the two ends of the cover plate body are respectively provided with pole mounting holes, and positive pole injection molded insulating parts and negative pole injection molded insulating parts are provided in the pole mounting holes for installing positive pole and negative pole; the cover plate body is also provided with an explosion-proof valve mounting hole, an explosion-proof valve is provided in the explosion-proof valve mounting hole, and an explosion-proof valve sticker is provided on the upper surface of the explosion-proof valve.

[0021] On the other hand, the present invention proposes a lithium battery, including a casing and a cell disposed inside the casing. The top of the cell is provided with a positive electrode tab and a negative electrode tab, and the battery also includes a battery cover plate. After the battery cover plate is connected to the casing, the positive electrode post is electrically connected to the positive electrode tab, and the negative electrode post is electrically connected to the negative electrode tab through a contact member.

[0022] This invention incorporates a flipping element and improves the specific structure of the positive and / or negative terminals, while also providing a contact element in a hinged manner. When the battery malfunctions, the flipping element and the contact element rise under pressure, thereby cutting off the connection between the positive terminal and the positive tab and / or the connection between the negative terminal and the negative tab. This immediately disconnects the battery circuit, preventing the internal energy of the battery from continuing to surge and causing an explosion or endangering personnel safety.

[0023] Compared with existing technologies, this invention changes the power-off operation of the cover plate from the traditional method of breaking the weld joint or melting the low-melting-point alloy to a mechanical structure. This not only triggers quickly, sensitively, and reliably, but also has a simple structure, low processing cost, and convenient installation, making it worthy of widespread application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is an exploded view of one embodiment of the battery cover with power failure protection function proposed in this invention.

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of the negative electrode post body in the negative electrode post;

[0027] Figure 3 for Figure 1 A schematic diagram of the contact portion in the negative electrode post;

[0028] Figure 4 for Figure 1 Schematic diagram of the structure of the inverted component;

[0029] Figure 5 for Figure 1 A combination diagram;

[0030] Figure 6 for Figure 5 A schematic diagram of a local structure in the image;

[0031] Figure 7 for Figure 6Enlarged structural diagram at point A;

[0032] Figure 8 This is one embodiment of the lithium battery proposed in this invention (excluding the battery cover plate);

[0033] Figure 9 for Figure 8 and Figure 1 The appearance of the battery cover after it has been connected is shown.

[0034] Figure 10 for Figure 9 Mid-section of local structure Figure 1 ;

[0035] Figure 11 for Figure 9 Mid-section of local structure Figure 2 ;

[0036] Figure 12 for Figure 11 A magnified structural diagram at point B in the middle.

[0037] 1. Substrate; 11. Terminal mounting hole; 12. Explosion-proof valve mounting hole; 13. Flip-up part mounting hole; 2. Injection molded part; 3. Positive terminal; 4. Negative terminal; 41. Negative terminal body; 411. Boss; 412. Rotating shaft; 413. Tension spring shaft; 42. Contact element; 421. Hook; 422. Contact part; 43. Tension spring; 5. Positive terminal injection molded insulating part; 6. Negative terminal injection molded insulating part; 7. Flip-up part; 71. First connecting piece; 72. Second connecting piece; 73. Flip-up part; 731. Flip-up part connecting end; 732. Flip-up part contact end; 74. Connecting post; 8. Explosion-proof valve; 9. Explosion-proof valve sticker; 10. Housing; 101. Positive electrode tab; 102. Negative electrode tab. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. The following embodiments and operations not described in detail in the comparative examples are all conventional technical means in the art.

[0039] The structures or components not explicitly described in the following embodiments and comparative examples are all conventional structures or components in the art, and can be commercially available or self-made without creative effort in the prior art. The technical operations not explicitly or in detail described in the following embodiments and comparative examples are all conventional technical operations in the art.

[0040] like Figures 1-7 As shown in the figure: This invention proposes a battery cover with power failure protection function, comprising:

[0041] Cover plate body;

[0042] Positive electrode post 3, which is fixed to one end of the cover plate body;

[0043] The negative electrode post 4 is fixed to the other end of the cover plate body. The negative electrode post 4 includes a negative electrode post body 41, and a boss 411 is provided at the bottom end of the negative electrode post body 41.

[0044] Flip-over component 7 is fixedly connected to the cover plate body and has a flip-over contact end 732 at the bottom that can slide along the height direction;

[0045] A contact 42 is rotatably connected to the boss 411. A tension spring 43 is also provided between the boss 411 and the contact 42. The contact 42 maintains a fixed angle with the boss 411 under the action of the tension spring 43.

[0046] The flip-up contact end 732 is located below the contact member 42 and there is a gap between them. After the flip-up contact end 732 slides upward, it drives the contact member 42 to rotate and change the fixed angle. Both the boss 411 and the contact member 42 are conductive.

[0047] Working principle: When the battery is working normally, the contact 42 maintains a fixed angle with the boss 411 under the action of the tension spring 43. The specific range of this fixed angle is to ensure stable contact between the contact 42 and the negative electrode tab. At this time, there is no contact between the flip-top contact end 732 and the contact 42. When the battery malfunctions, the instantaneous pressure increases. Under the action of the pressure, the contact 42 itself will move upward. At the same time, the flip-top contact end 732 will also move upward and apply an upward lifting force to the contact 42. Under the combined action, the contact 42 quickly rises and separates from the negative electrode tab, cutting off the connection between the positive and negative terminals of the battery and realizing the power failure protection function.

[0048] It should be noted that:

[0049] (1) The above implementation is only an example. In practice, the boss 411 can be set only at the bottom of the negative terminal 4, or only at the bottom of the positive terminal 3, or simultaneously at the bottom of the positive terminal 3 and the bottom of the negative terminal 4, so as to achieve the purpose of double disconnection of positive and negative terminal connection.

[0050] (2) The material of the boss 411 is the same as that of the negative electrode post body 41. The boss 411 can be a design structure independent of the negative electrode post body 41, or it can be integrated with the negative electrode post body 41. It is preferably formed by extending the bottom part of the negative electrode post body 41, which is convenient for processing and can ensure stable connection and conductivity.

[0051] (3) The contact 42 is preferably designed to be made of the same material as the negative terminal body 41. The material of the flipping part 7 is not required; either conductive or insulating material is acceptable.

[0052] As a preferred technical solution, in another embodiment of the present invention, the boss 411 is fixed with a rotating shaft 412 in the transverse direction and a tension spring shaft 413 in the longitudinal direction. One end of the contact member 42 is provided with two hooks 421 and the other end is provided with a contact portion 422. The contact member 42 is rotatably connected to the rotating shaft 412 through the hooks 421. When the contact member 42 rotates, it contacts the contact end 732 of the flipping part through the contact portion 422.

[0053] In this embodiment, a hollow area is left between the two hooks 421 to accommodate the boss 411, so as to ensure the hinge effect between the contact 42 and the boss 411 and realize its unobstructed rotation.

[0054] In this embodiment, the hook 421 and the contact portion 422 are located at opposite ends of the contact member 42 and are preferably integrally formed with the contact member 42.

[0055] In this embodiment, where the internal space of the battery allows, the contact 42 is preferably designed to be relatively large in size, which facilitates both current conduction and stress under pressure.

[0056] As a preferred technical solution, in another embodiment of the present invention, the contact end 732 of the flipping part is a flat sheet structure, and the contact part 422 is an arc-shaped sheet structure, wherein the height difference between the lowest point of the flat sheet structure and the arc-shaped sheet structure is 5 mm or more.

[0057] To disconnect the negative terminal 4 from the negative electrode tab in a timely, efficient, and rapid manner, the flip-top contact end 732 and the contact part 422 are designed as pressure-sensitive sheet structures. The flip-top contact end 732 is designed as a flat sheet, and the contact part 422 is designed as an arc-shaped sheet. The arc-shaped sheet is a downwardly concave structure similar to a small hemisphere. The height difference between the lowest point of the flat sheet and the small hemisphere structure is at least 5mm. This ensures that the flip-top contact end 732 and the contact part 422 do not contact each other under normal conditions, and also ensures that in the event of a battery failure, the flip-top contact end 732 can quickly contact the contact part 422 and assist the contact part 422 in quickly lifting to disconnect from the negative electrode tab and cut off the connection between the positive and negative terminals of the battery.

[0058] As a preferred technical solution, in another embodiment of the present invention, the contact member 42 is further provided with a hanging hole, which is located in the middle of one end of the contact member 42 where the hook 421 is provided, and the tension spring shaft 413 is provided with another hanging hole. The two ends of the tension spring 43 are respectively hooked onto the two hanging holes, so that the contact member 42 maintains an elastic and rotatable connection with the boss 411.

[0059] When the battery is in normal condition, the contact 42 is kept in a static and fixed state under the action of the tension spring 43 and is in stable contact with the negative electrode tab. When the battery fails, the contact 42 itself will be lifted under pressure, and at the same time, the flipping part 7 will assist in lifting. Under the dual action, it will quickly rotate and leave the negative electrode tab, realizing the disconnection of the negative electrode post 4 from the negative electrode tab.

[0060] As a preferred technical solution, in another embodiment of the present invention, the flipping component 7 includes a first connecting piece 71, a second connecting piece 72, a flipping part 73, and a connecting post 74. The first connecting piece 71 and the second connecting piece 72 are fixedly connected to the connecting post 74 from high to low. The cover plate body is provided with a flipping component mounting hole 13. The circular plate structure is fixed to the outer periphery of the cylindrical structure. The first connecting piece 71 and the second connecting piece 72 are seamlessly welded to the upper and lower parts of the flipping component mounting hole 13, respectively. The top end of the flipping part 73 is provided with a flipping part connecting end 731. The flipping part 73 is slidably connected to the connecting post 74 through the flipping part connecting end 731.

[0061] To facilitate installation and connection, the second connecting piece 72 and the connecting post 74 can be designed as an integrated structure, while the first connecting piece 71 is designed as an independent structure. Preferably, a connecting boss is provided on the upper surface of the flip-part mounting hole 13. During installation, the connecting post 74 is first inserted from below the flip-part mounting hole 13, then the second connecting piece 72 is laser-welded to the lower surface of the flip-part mounting hole 13, and then the first connecting piece 71 is fixedly connected to the connecting boss. A double-sealed connection is achieved through the first connecting piece 71 and the second connecting piece 72 to avoid adverse effects on the lifting of the flip-part 7 due to poor sealing.

[0062] As a preferred technical solution, in another embodiment of the present invention, the first connecting piece 71 and the second connecting piece 72 are both concave circular sheet structures, and the connecting post 74 is a cylindrical structure.

[0063] As a preferred technical solution, in another embodiment of the present invention, the flip-part connecting end 731 and the flip-part contact end 732 are integrated structures, and the flip-part contact end 732 and the connecting post 74 are L-shaped.

[0064] Both the first connecting piece 71 and the second connecting piece 72 are designed as concave circular pieces, mainly to facilitate laser welding operations and ensure welding results. The flip-top connecting end 731 is slidably connected to the connecting post 74. When the pressure inside the battery rises to a certain level, the air pressure acts on the sheet-like flip-top contact end 732, causing the flip-top connecting end 731 to slide upward in the height direction of the connecting post 74, and then act on the contact part 422, assisting in the lifting of the contact part 422, making the disconnection operation more sensitive, timely, and fast.

[0065] As a preferred technical solution, in another embodiment of the present invention, the cover plate body includes a base plate 1 and an injection molded part 2; the two ends of the cover plate body are respectively provided with pole mounting holes 11, and the pole mounting holes 11 are provided with positive pole injection molded insulating parts 5 and negative pole injection molded insulating parts 6 for installing positive pole 3 and negative pole 4; the cover plate body is also provided with explosion-proof valve mounting holes 12, and explosion-proof valve 8 is provided in the explosion-proof valve mounting holes 12, and explosion-proof valve sticker 9 is provided on the upper surface of the explosion-proof valve 8.

[0066] In this embodiment, the injection molded part 2 is provided with a pole hole boss at the position corresponding to the pole mounting hole 11. The pole hole boss cooperates with the pole mounting hole 11 and guides the assembly of the substrate 1 and the injection molded part 2, so that the positive pole 3 and the negative pole 4 can be inserted into the two pole mounting holes 11 at the same time.

[0067] In this embodiment, the explosion-proof valve 8 is laser-welded into the explosion-proof valve mounting hole 12, and an explosion-proof valve sticker 9 is affixed above it.

[0068] In this embodiment, the periphery of the terminal mounting hole 11 is nano-engraved to maintain a 1-3mm gap with the positive terminal 3 and the negative terminal 4 for injection molding. Injection molding is then used to create the positive terminal injection molding insulation part 5 and the negative terminal injection molding insulation part 6 to ensure the sealing of the terminal mounting position.

[0069] like Figures 8-12 As shown in the figure: The present invention also proposes a lithium battery, including a housing 10 and a battery cell disposed inside the housing 10. The top of the battery cell is provided with a positive electrode tab 101 and a negative electrode tab 102. It also includes the battery cover plate mentioned in the above embodiment. After the battery cover plate is connected to the housing 10, the positive electrode post 3 is electrically connected to the positive electrode tab 101, and the negative electrode post 4 is electrically connected to the negative electrode tab 102 through a contact member 42.

[0070] In this embodiment, the top of the positive electrode tab 101 is provided with a insertion slot for inserting the positive electrode post 3 to achieve electrical connection between the positive electrode tab 101 and the positive electrode post 3. The side of the negative electrode tab 102 is set as an inclined surface, so that the contact member 42, specifically the contact portion 422, is stably pressed onto the inclined surface under the action of the tension spring 43 to achieve electrical connection between the negative electrode tab 102 and the negative electrode post 4. When the battery malfunctions and causes a sudden increase in internal pressure, the flipping member 7 and the contact member 42 work together to make the contact portion 422 leave the inclined surface, thereby disconnecting the negative electrode tab 102 from the negative electrode post 4, and the battery connection is cut off.

[0071] Of course, the structure of the positive electrode tab 101 and the negative electrode tab 102 shown in the figure is only one embodiment of the lithium battery proposed in this invention. Other structures of the positive electrode tab 101 and the negative electrode tab 102, as long as they can achieve connection with the positive electrode post 3 and connection and disconnection with the negative electrode post 4, can all be used in this invention.

[0072] In summary, this invention, by incorporating a flipping component and improving the specific structure of the positive and / or negative terminals, and by hingedly connecting a contact component, allows the flipping component and contact component to rise under pressure when the battery malfunctions, thereby disconnecting the connection between the positive terminal and the positive tab and / or the negative terminal and the negative tab. This immediately breaks the battery circuit, preventing further energy surges that could lead to an explosion and endanger personnel safety. Compared to existing technologies, this invention ensures safe battery operation through a mechanical mechanism, offering reliable, rapid, and controllable response. Furthermore, it features a simple structure, low processing cost, and convenient installation, making it highly promising for industrial applications.

[0073] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions, and variations to the above embodiments within the scope of the present invention. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

Claims

1. A battery cover plate having a power-off protection function, characterized by, The battery cover plate comprises: a cover plate body; a positive pole (3) fixed to one end of the cover plate body; a negative pole (4) fixed to the other end of the cover plate body; a turnover piece (7) fixedly connected with the cover plate body and provided with a turnover portion contact end (732) slidable in the height direction at the bottom; a boss (411) is arranged at the bottom end of the positive pole (3) or / and the negative pole (4), a contact piece (42) is rotatably connected to the boss (411), the contact piece (42) is used for electrically connecting with the tab, a tension spring (43) is further arranged between the boss (411) and the contact piece (42), and the contact piece (42) keeps a fixed included angle with the boss (411) under the action of the tension spring (43); the turnover portion contact end (732) is located below the contact piece (42) and a gap exists between the turnover portion contact end (732) and the contact piece (42), the turnover portion contact end (732) is slid upward to drive the contact piece (42) to rotate and change the fixed included angle, the contact piece (42) is separated from the tab to cut off the electrical connection between the tab and the pole; the boss (411) and the contact piece (42) are both conductive.

2. The battery cover plate of claim 1, wherein, The negative pole (4) comprises a negative pole body (41), and the bottom end of the negative pole body (41) is extended to form the boss (411).

3. The battery cover plate according to claim 1 or 2, characterized in that the boss (411) is fixed with a rotating shaft (412) in the transverse direction and a tension spring shaft (413) in the longitudinal direction, one end of the contact piece (42) is provided with two hooks (421), and the opposite end is provided with a contact portion (422), the contact piece (42) is rotatably connected with the rotating shaft (412) through the hooks (421), and the contact portion (422) is in contact with the turnover portion contact end (732) when the contact piece (42) rotates.

4. The battery cover plate of claim 3, wherein, The turnover portion contact end (732) is a flat sheet structure, the contact portion (422) is an arc-shaped sheet structure, and the height difference between the lowest parts of the flat sheet structure and the arc-shaped sheet structure is 5 mm or more.

5. The battery cover plate of claim 3, wherein, A hanging hole is further arranged on the contact piece (42), the hanging hole is located in the middle of the end of the contact piece (42) provided with the hooks (421), one end of the tension spring (43) is connected with the hanging hole, and the other end is connected with the tension spring shaft (413).

6. The battery cover plate of claim 1, wherein, The turnover piece (7) comprises a first connecting sheet (71), a second connecting sheet (72), a turnover portion (73) and a connecting column (74), the first connecting sheet (71) and the second connecting sheet (72) are fixedly connected with the connecting column (74) from high to low, the cover plate body is provided with a turnover piece mounting hole (13), the first connecting sheet (71) and the second connecting sheet (72) are fixed to the outer periphery of the connecting column (74), the first connecting sheet (71) and the second connecting sheet (72) are respectively seamlessly welded to the upper and lower parts of the turnover piece mounting hole (13), the top end of the turnover portion (73) is provided with a turnover portion connecting end (731), and the turnover portion (73) is slidably connected with the connecting column (74) through the turnover portion connecting end (731).

7. The battery cover plate of claim 6, wherein, The first connecting sheet (71) and the second connecting sheet (72) are both circular sheet structures with concave surfaces, and the connecting column (74) is a cylindrical structure.

8. The battery cover plate of claim 6, wherein, The overturning part connecting end (731) and the overturning part contact end (732) are integrated, and the overturning part contact end (732) is L-shaped with the connecting column (74).

9. The battery cover plate according to any one of claims 1-8, characterized in that, The cover plate body comprises a base plate (1) and an injection molding part (2); Two ends of the cover plate body are respectively provided with pole column mounting holes (11), and the pole column mounting holes (11) are provided with positive pole column injection molding insulating parts (5) and negative pole column injection molding insulating parts (6) for mounting positive pole columns (3) and negative pole columns (4); the cover plate body is further provided with an explosion-proof valve mounting hole (12), and the explosion-proof valve mounting hole (12) is provided with an explosion-proof valve (8), and the upper surface of the explosion-proof valve (8) is provided with an explosion-proof valve sticker (9).

10. A lithium battery comprising a housing (10) and an electrode core arranged in the housing (10), a top end of the electrode core being provided with a positive electrode tab (101) and a negative electrode tab (102), characterized in that, Further comprising the battery cover plate according to any one of claims 1-9, after the battery cover plate is connected with the shell (10), the positive pole column (3) is electrically connected with the positive pole lug (101), and the negative pole column (4) is electrically connected with the negative pole lug (102) through the contact part (42).

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