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

Abstract

The invention 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. A positive pole; a negative pole; a turnover part contact end capable of sliding in the height direction is arranged at the bottom of the turnover part; a boss is arranged at the bottom end of the positive pole or / and the negative pole, a contact piece is rotatably connected to the boss, a tension spring is further arranged between the boss and the contact piece, and a fixed included angle is kept between the contact piece and the boss under the action of the tension spring; the overturning part contact end is located below the contact piece, a gap exists between the overturning part contact end and the contact piece, and the overturning part contact end slides upwards to drive the contact piece to rotate and change the fixed included angle; the lithium battery comprises a shell, a battery cell and the battery cover plate. According to the invention, the power-off operation of the cover plate is realized by adjusting a traditional welding spot snapping or fusing low-melting-point alloy into a 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] The invention relates to the technical field of battery cover plates, in particular to a battery cover plate and a lithium battery with a power-off protection function. Background Art

[0002] At present, square aluminum shell lithium-ion batteries are used in many fields, providing great convenience for people's production and life. In order to ensure the safe use of square aluminum shell lithium-ion batteries and prevent potential safety accidents, the prior art sets a flip plate on the battery cover. When the battery has puncture, overcharge and other faults, a large amount of gas is produced inside the battery, and the air pressure triggers the flip plate, so that it connects with the conductive block and then connects the positive and negative poles. The positive and negative poles are short-circuited and discharged, the battery stops working, and the internal pressure of the battery no longer continues to increase, thereby protecting the battery. At the same time, in order to prevent the gas production inside the battery from triggering the flip plate during hot box and high-temperature storage tests, causing the positive and negative poles to be connected and discharged, and then causing extreme situations such as burning in the test box, the researchers set a solder point or low-melting-point alloy at the contact part of the flip plate to delay the triggering of the flip plate, so as to avoid the situation where the current is too large after the flip plate is triggered, causing the battery test process to fail. The design of welding points or low-melting-point alloys can protect the safety of batteries to a certain extent, and the excessive discharge of the positive and negative poles can be terminated by breaking the welding points or melting the low-melting-point alloys. However, since the force of breaking the welding points or low-melting-point alloys cannot be precisely controlled, the triggering timing is uncontrollable, and the welding points can easily affect the sealing of the flipping plate, causing frequent failures such as false touch and non-touch of the flipping mechanism. In addition, low-melting-point alloys involve the combination of two or more materials, which is difficult to process, and the dripping of low-melting-point alloys at the pole ears can easily cause short circuits in the battery cells, which becomes a cause of battery failure.

[0003] To this end, this application is filed. Summary of the invention

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

[0005] The present invention is achieved in that:

[0006] In one aspect, the present invention provides a battery cover with a power-off protection function, comprising:

[0007] Cover plate body;

[0008] A positive electrode column, the positive electrode column is fixed to one end of the cover body;

[0009] A negative electrode column, the negative electrode column is fixed to the other end of the cover body;

[0010] A flipping member, which is fixedly connected to the cover body and has a flipping contact end at the bottom that can slide along the height direction;

[0011] A boss is provided at the bottom end of the positive pole or / and the negative pole, a contact piece is rotatably connected to the boss, a tension spring is provided between the boss and the contact piece, and the contact piece maintains a fixed angle with the boss under the action of the tension spring;

[0012] The contact end of the flip part is located below the contact piece and there is a gap between the contact piece and the flip part. After the contact end of the flip part slides upward, it drives the contact piece to rotate and changes the fixed angle; the boss and the contact piece are both conductive.

[0013] Preferably, the negative electrode post comprises a negative electrode post body, and the bottom end portion of the negative electrode post body extends to form a boss.

[0014] Further preferably, the boss is fixed with a rotating shaft in the transverse direction and a tension spring shaft in the longitudinal direction, two hooks are provided at one end of the contact piece and a contact portion is provided at the other opposite end, the contact piece is rotatably connected to the rotating shaft through the hooks, and when the contact piece rotates, it contacts the contact end of the flip portion through the contact portion.

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

[0016] Further preferably, the contact piece is further provided with a hanging hole, the hanging hole is located in the middle of one end of the contact piece where a hook is provided, one end of the tension spring is connected to the hanging hole, and the other end is connected to the tension spring shaft.

[0017] Further preferably, the flip part includes a first connecting piece, a second connecting piece, a flip part and a connecting column, the first connecting piece and the second connecting piece are fixedly connected to the connecting column from high to low, the cover plate body is provided with a flip part mounting hole, the disc 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 flip part mounting hole respectively, a flip part connecting end is provided at the top of the flip part, and the flip part is slidably connected to the connecting column through the flip part connecting end.

[0018] Further preferably, the first connecting piece and the second connecting piece are both disc structures with concave surfaces, and the connecting column is a cylindrical structure.

[0019] Further preferably, the flip portion connecting end and the flip portion contact end are an integrated structure, and the flip portion contact end and the connecting column are L-shaped.

[0020] Further preferably, the cover body includes a substrate and an injection molded part; pole mounting holes are respectively opened at both ends of the cover body, and positive pole injection molded insulating parts and negative pole injection molded insulating parts for mounting positive poles and negative poles are arranged in the pole mounting holes; an explosion-proof valve mounting hole is also provided on the cover body, an explosion-proof valve is arranged in the explosion-proof valve mounting hole, and an explosion-proof valve sticker is arranged on the upper surface of the explosion-proof valve.

[0021] On the other hand, the present invention proposes a lithium battery, comprising a shell and a battery cell arranged in the shell, wherein the top of the battery cell is provided with a positive electrode ear and a negative electrode ear, and also comprises a battery cover plate, after the battery cover plate is connected to the shell, the positive electrode post is electrically connected to the positive electrode ear, and the negative electrode post is electrically connected to the negative electrode ear through a contact piece.

[0022] The present invention provides a flip piece and improves the specific structure of the positive electrode column and / or the negative electrode column and provides a contact piece in a hinged manner. When a battery fails, the flip piece and the contact piece are lifted under pressure and then cut off the connection between the positive electrode column and the positive electrode ear and / or the connection between the negative electrode column and the negative electrode ear. The battery is disconnected to avoid the internal energy of the battery from continuing to surge and causing explosion and endangering the safety of personnel.

[0023] Compared with the prior art, the present invention adjusts the power-off operation of the cover plate from the traditional pulling-off welding point or melting the low-melting-point alloy to a mechanical structure, which is not only quickly, sensitively and reliably triggered, but also has a simple structure, low processing cost and easy installation, and is worthy of popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 An embodiment of the battery cover with power-off protection function proposed by the present invention (explosion diagram);

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

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

[0028] Figure 4 for Figure 1 A schematic diagram of the structure of the middle flip part;

[0029] Figure 5 for Figure 1 Combination chart of

[0030] Figure 6 for Figure 5 Schematic diagram of the local structure in;

[0031] Figure 7 for Figure 6A schematic diagram of the enlarged structure at A in the middle;

[0032] Figure 8 This is an implementation mode of the lithium battery proposed by the present invention (except the battery cover);

[0033] Fig. 9 for Figure 8 and Figure 1 The appearance of the battery cover after being connected is shown;

[0034] Fig.10 for Fig. 9 Partial structure section Figure 1 ;

[0035] Fig.11 for Fig. 9 Partial structure section Figure 2 ;

[0036] Fig.12 for Fig.11 Schematic diagram of the enlarged structure at point B in the middle.

[0037] 1. Base plate; 11. Pole mounting hole; 12. Explosion-proof valve mounting hole; 13. Flip part mounting hole; 2. Injection molded part; 3. Positive pole; 4. Negative pole; 41. Negative pole body; 411. Boss; 412. Rotating shaft; 413. Tension spring shaft; 42. Contact piece; 421. Hook; 422. Contact part; 43. Tension spring; 5. Injection molded insulating part of positive pole; 6. Injection molded insulating part of negative pole; 7. Flip part; 71. First connecting piece; 72. Second connecting piece; 73. Flip part; 731. Flip part connecting end; 732. Flip part contact end; 74. Connecting column; 8. Explosion-proof valve; 9. Explosion-proof valve sticker; 10. Shell; 101. Positive ear; 102. Negative ear. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of this application. The operations not described in detail in the following embodiments and comparative examples are all conventional technical means in this field.

[0039] The structures or components not explicitly described in the following examples and comparative examples are all conventional structures or components in the art, and can be commercially obtained or obtained by oneself without creative labor in the prior art. The technical operations not explicitly or in detail described in the following examples and comparative examples are all conventional technical operation means in the art.

[0040] like Figure 1-Figure 7 As shown in the figure: The present invention provides a battery cover with a power-off protection function, comprising:

[0041] Cover plate body;

[0042] A positive electrode column 3, the positive electrode column 3 is fixed to one end of the cover body;

[0043] A negative pole column 4, the negative pole column 4 is fixed to the other end of the cover body, the negative pole column 4 comprises a negative pole column body 41, and a boss 411 is provided at the bottom end of the negative pole column body 41;

[0044] A flip member 7, the flip member 7 is fixedly connected to the cover body and has a flip portion contact end 732 at the bottom thereof which is slidable in the height direction;

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

[0046] The flip portion contact end 732 is located below the contact piece 42 and there is a gap between the flip portion contact end 732 and the contact piece 42. After the flip portion contact end 732 slides upward, it drives the contact piece 42 to rotate and change the fixed angle; the boss 411 and the contact piece 42 are both 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 the fixed angle is to ensure stable contact between the contact 42 and the negative ear. At this time, the flip part contact end 732 and the contact 42 are not in contact. When the battery fails, the instantaneous pressure increases. Under the action of the pressure, the contact 42 itself will move upward, and the flip part contact end 732 will also move upward and apply an upward lifting force to the contact 42. Under the joint action, the contact 42 quickly lifts and leaves the negative ear, cutting off the connection between the positive and negative electrodes of the battery, and realizing the power-off protection function.

[0048] It should be noted that:

[0049] (1) The above implementation is only an example. In specific practice, the boss 411 can be set only at the bottom end of the negative electrode column 4, or only at the bottom end of the positive electrode column 3, or at the bottom end of the positive electrode column 3 and the bottom end of the negative electrode column 4 at the same time, so as to achieve the purpose of double disconnection of the positive and negative electrodes.

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

[0051] (3) The contact member 42 is also preferably designed to be made of the same material as the negative electrode body 41. The material of the flip member 7 is not critical, and either conductive material or insulating material can be used.

[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 horizontal 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 other opposite end is provided with a contact portion 422, the contact piece 42 is rotatably connected to the rotating shaft 412 through the hook 421, and when the contact piece 42 rotates, it contacts the contact end 732 of the flip portion 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 member 42 and the boss 411 and realize the obstacle-free rotation thereof.

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

[0055] In this embodiment, if the internal space of the battery allows, the contact member 42 is preferably designed to be relatively large in size, so as to facilitate the conduction of current and the bearing of force when under pressure.

[0056] As a preferred technical solution, in another embodiment of the present invention, the flip 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 point of the flat sheet structure and the arc-shaped sheet structure is 5 mm or more.

[0057] In order to disconnect the connection between the negative pole 4 and the negative ear in a timely, efficient and rapid manner, the flip part contact end 732 and the contact part 422 are designed as sheet structures that are sensitive to pressure, the flip part 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 hemispherical structure, and the height difference between the flat sheet and the lowest point of the small hemispherical structure is at least 5 mm, so as to ensure that the flip part contact end 732 and the contact part 422 are not in contact under normal conditions, and to ensure that when the battery fails, the flip part contact end 732 can quickly contact the contact part 422 and assist the contact part 422 to quickly rise to disconnect the contact with the negative ear, thereby cutting off the connection between the positive and negative poles of the battery.

[0058] As a preferred technical solution, in another embodiment of the present invention, a hanging hole is further provided on the contact member 42, and the hanging hole is located in the middle of one end of the contact member 42 where a hook 421 is provided, and another hanging hole is provided on the tension spring shaft 413, and the two ends of the tension spring 43 are respectively hooked on 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 state, the contact piece 42 maintains a static, fixed state and stably contacts the negative pole ear under the action of the tension spring 43; when the battery fails, the contact piece 42 itself will be lifted under the action of pressure, and the flip piece 7 will assist in lifting. Under the dual action, it will quickly rotate and leave the negative pole ear, thereby disconnecting the negative pole column 4 from the negative pole ear.

[0060] As a preferred technical solution, in another embodiment of the present invention, the flip member 7 includes a first connecting piece 71, a second connecting piece 72, a flip portion 73 and a connecting column 74. The first connecting piece 71 and the second connecting piece 72 are fixedly connected to the connecting column 74 from high to low. The cover plate body is provided with a flip member mounting hole 13. The disc 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 flip member mounting hole 13 respectively. A flip portion connecting end 731 is provided at the top of the flip portion 73. The flip portion 73 is slidably connected to the connecting column 74 through the flip portion connecting end 731.

[0061] In order to facilitate installation and connection, the second connecting piece 72 and the connecting column 74 can be designed as an integrated structure, and the first connecting piece 71 is designed as an independent structure. A connecting boss is preferably provided on the upper surface of the flip member mounting hole 13. During installation, the connecting column 74 is first inserted from the bottom of the flip member mounting hole 13, and then the second connecting piece 72 is laser welded to the lower surface of the flip member mounting hole 13, and then the first connecting piece 71 is fixedly connected to the connecting boss. The first connecting piece 71 and the second connecting piece 72 realize a double sealing connection to avoid the adverse effect of poor sealing on the lifting of the flip member 7.

[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 circular structures with concave surfaces, and the connecting column 74 is a cylindrical structure.

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

[0064] The first connecting piece 71 and the second connecting piece 72 are both designed as circular structures with concave surfaces, mainly to facilitate laser welding operations and ensure welding effects. The flip part connection end 731 is slidably connected to the connection column 74. When the pressure inside the battery rises to a certain level, the air pressure acts on the sheet-shaped flip part contact end 732, causing the flip part connection end 731 to slide upward in the height direction of the connection column 74, and then acts on the contact part 422, assisting 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 body includes a substrate 1 and an injection molded part 2; pole mounting holes 11 are respectively opened at both ends of the cover body, 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 poles 3 and negative poles 4; an explosion-proof valve mounting hole 12 is also provided on the cover body, and an explosion-proof valve 8 is provided in the explosion-proof valve mounting hole 12, and an explosion-proof valve sticker 9 is provided on the upper surface of the explosion-proof valve 8.

[0066] In this embodiment, a pole hole boss is provided at a position of the injection molded part 2 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, making it convenient for the positive pole 3 and the negative pole 4 to simultaneously penetrate into the two pole mounting holes 11.

[0067] In this embodiment, the explosion-proof valve 8 is laser welded in the explosion-proof valve mounting hole 12, and an explosion-proof valve sticker 9 is attached on the top.

[0068] In this embodiment, the pole mounting hole 11 is nano-engraved around so that a gap of 1-3 mm is maintained between it and the positive pole 3 and the negative pole 4 for injection molding. The positive pole injection molding insulating part 5 and the negative pole injection molding insulating part 6 are generated by injection molding to ensure the sealing of the pole mounting position.

[0069] like Figure 8-Figure 12 As shown together: The present invention also proposes a lithium battery, including a shell 10 and a battery cell arranged in the shell 10, the top of the battery cell is provided with a positive electrode ear 101 and a negative electrode ear 102, and also includes the battery cover mentioned in the above embodiment. After the battery cover is connected to the shell 10, the positive electrode column 3 is electrically connected to the positive electrode ear 101, and the negative electrode column 4 is electrically connected to the negative electrode ear 102 through the contact piece 42.

[0070] In this embodiment, a plug-in slot for plugging into the positive pole 3 to achieve electrical connection between the positive pole 101 and the positive pole 3 is provided at the top of the positive pole ear 101, and a side surface of the negative pole ear 102 is provided as an inclined surface, so that the contact member 42, specifically the contact portion 422, is stably pressed on the inclined surface under the action of the tension spring 43 to achieve electrical connection between the negative pole ear 102 and the negative pole 4. When a battery failure occurs and the internal pressure suddenly increases, the flip member 7 cooperates with the contact member 42 to make the contact portion 422 leave the inclined surface, thereby disconnecting the negative pole ear 102 from the negative pole 4, and the battery is disconnected.

[0071] Of course, the structure of the positive electrode ear 101 and the negative electrode ear 102 shown in the figure is only one embodiment of the lithium battery proposed by the present invention. Positive electrode ears 101 and negative electrode ears 102 with other structures can be used in the present invention as long as they can achieve connection with the positive electrode column 3 and connection and disconnection with the negative electrode column 4.

[0072] In summary: the present invention sets a flip piece and improves the specific structure of the positive pole and / or the negative pole and sets a contact piece in a hinged manner. When the battery fails, the flip piece and the contact piece are lifted under pressure and then cut off the connection between the positive pole and the positive ear and / or the connection between the negative pole and the negative ear, and the battery is disconnected to avoid the internal energy of the battery from continuing to surge and causing explosion and endangering personnel safety. Compared with the prior art, the present invention ensures the safe operation of the battery through a mechanical mechanism, which is not only reliable, rapid and controllable, but also simple in structure, low in processing cost and easy to install, and has great prospects for industrial application.

[0073] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and deform the above embodiments within the scope of the present invention. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradiction.

Claims

1. A battery cover with power-off protection function, characterized in that: include: Cover plate body; A positive electrode column (3), the positive electrode column (3) is fixed to one end of the cover plate body; A negative electrode column (4), the negative electrode column (4) is fixed to the other end of the cover plate body; A flip member (7), the flip member (7) is fixedly connected to the cover plate body and has a flip portion contact end (732) at the bottom that is slidable in the height direction; A boss (411) is provided 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), a tension spring (43) is provided between the boss (411) and the contact piece (42), and the contact piece (42) maintains a fixed angle with the boss (411) under the action of the tension spring (43); The flip portion contact end (732) is located below the contact piece (42) and there is a gap between the flip portion contact end (732) and the contact piece (42). After the flip portion contact end (732) slides upward, it drives the contact piece (42) to rotate and change the fixed angle; the boss (411) and the contact piece (42) are both conductive.

2. The battery cover according to claim 1, characterized in that: The negative pole column (4) comprises a negative pole column body (41), and the bottom end portion of the negative pole column body (41) extends to form a boss (411).

3. The battery cover 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 other opposite end is provided with a contact portion (422). The contact piece (42) is rotatably connected to the rotating shaft (412) through the hooks (421). When the contact piece (42) rotates, it contacts the contact end (732) of the flip portion through the contact portion (422).

4. The battery cover according to claim 3, characterized in that: The flip 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 point of the flat sheet structure and the arc-shaped sheet structure is 5 mm or more.

5. The battery cover according to claim 3, characterized in that: The contact member (42) is also provided with a hanging hole, which is located in the middle of one end of a hook (421) provided on the contact member (42); one end of the tension spring (43) is connected to the hanging hole, and the other end is connected to the tension spring shaft (413).

6. The battery cover according to claim 1, characterized in that: The flip member (7) comprises a first connecting piece (71), a second connecting piece (72), a flip portion (73) and a connecting column (74); the first connecting piece (71) and the second connecting piece (72) are fixedly connected to the connecting column (74) from high to low; a flip member mounting hole (13) is provided on the cover plate body; the circular sheet 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 flip member mounting hole (13) respectively; a flip portion connecting end (731) is provided at the top end of the flip portion (73); and the flip portion (73) is slidably connected to the connecting column (74) via the flip portion connecting end (731).

7. The battery cover according to claim 6, characterized in that: The first connecting piece (71) and the second connecting piece (72) are both circular structures with concave surfaces, and the connecting column (74) is a cylindrical structure.

8. The battery cover according to claim 6, characterized in that: The flip portion connecting end (731) and the flip portion contact end (732) are an integrated structure, and the flip portion contact end (732) and the connecting column (74) are L-shaped.

9. The battery cover according to any one of claims 1 to 8, characterized in that: The cover plate body comprises a base plate (1) and an injection molded part (2); The two ends of the cover 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 mounting positive poles (3) and negative poles (4); the cover body is also provided with an explosion-proof valve mounting hole (12), and an explosion-proof valve (8) is arranged in the explosion-proof valve mounting hole (12), and an explosion-proof valve sticker (9) is arranged on the upper surface of the explosion-proof valve (8).

10. A lithium battery, comprising a housing (10) and a battery cell arranged in the housing (10), wherein a positive electrode tab (101) and a negative electrode tab (102) are arranged at the top of the battery cell, characterized in that: It also includes a battery cover as described in any one of claims 1 to 9, after the battery cover is connected to the housing (10), the positive electrode column (3) is electrically connected to the positive electrode ear (101), and the negative electrode column (4) is electrically connected to the negative electrode ear (102) through the contact piece (42).

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