Battery top cover

Abstract

The utility model relates to and discloses a battery top cover. Relates to the technical field of new energy batteries. The cover plate specifically comprises a cover plate main body and lower plastic mounted on the inner side of the cover plate main body, and the lower plastic is used for insulating the cover plate main body and a connecting piece; a liquid injection hole is formed in the cover plate main body, the liquid injection hole is used for injecting liquid into a battery shell, a hollow part is arranged at the position, right opposite to the liquid injection hole, of the lower plastic, the hollow part is communicated with the liquid injection hole, and the hollow part is used for buffering the impact force of the electrolyte when the electrolyte flows through the hollow part. According to the utility model, the hollow part is arranged at the position, opposite to the liquid injection hole, of the lower plastic, during liquid injection, electrolyte sequentially flows through the liquid injection hole and the hollow part and then enters the battery shell, and in the process, the hollow part can buffer the impact force of the electrolyte, so that the electrolyte is prevented from being damaged. Therefore, the problems of battery cell pole piece damage, anode and cathode material falling and the like caused by the impact force of the electrolyte are prevented, and the performance and the service life of the lithium battery are further ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field especially relates to a battery top cover. BACKGROUND

[0002] Lithium battery has been widely applied in new energy automobile, energy storage and other fields due to its advantages of large specific energy, high working voltage, long cycle life, green environmental protection and the like. The lithium battery generally comprises a battery cell, a battery shell, a battery top cover, a connecting piece and an electrolyte. The battery cell is accommodated in the battery shell. The electrolyte is filled in the battery shell to immerse the battery cell. The battery top cover is assembled with the battery shell to close the battery shell. The connecting piece connects the tab of the battery cell with the battery top cover to realize the conduction of the battery cell and the battery top cover.

[0003] In the manufacturing process of the lithium battery, the liquid injection of the lithium battery is generally performed after the battery top cover closes the battery shell. Therefore, the liquid injection hole is arranged on the battery top cover to inject the electrolyte. In the prior art, the liquid injection hole arranged on the battery top cover is generally a straight-through hole. When the liquid injection is performed, the electrolyte directly flows into the battery shell through the liquid injection hole. The impact force of the electrolyte acts on the battery cell in the battery shell, which may cause the damage of the tab of the battery cell, the falling of the positive and negative electrode materials and other problems, thereby affecting the performance and service life of the battery. SUMMARY

[0004] The utility model aims at the deficiency of the prior art, and provides a battery top cover which can prevent the impact force of the electrolyte from causing the damage of the tab of the battery cell, the falling of the positive and negative electrode materials and other problems in the liquid injection process of the lithium battery, thereby ensuring the performance and service life of the lithium battery.

[0005] The utility model provides a battery top cover, including the cover plate main part and install in the lower plastic of the cover plate main part inboard, the lower plastic is used for the insulation of the cover plate main part and connecting piece, the cover plate main part is equipped with the liquid injection hole, the liquid injection hole is used for the liquid injection to the battery shell, the lower plastic is equipped with the hollow part opposite the position of the liquid injection hole, the hollow part with the liquid injection hole intercommunication, the hollow part is used for buffering the impact force of electrolyte when electrolyte flows.

[0006] Further, the hollow part comprises a sink on the lower plastic extending downward, and a liquid flow hole arranged at the bottom of the sink. The top of the sink is in communication with the liquid injection hole, and the liquid flow hole is in communication with the outside from the bottom of the sink.

[0007] Further, the hollow part further comprises a convex table extending upward at the bottom of the sink. The convex table is coaxial with the liquid injection hole. The electrolyte flowing through the liquid injection hole flows out from the liquid flow hole under the guidance of the convex table.

[0008] Further, the hollow part further comprises a liquid injection groove arranged on the top of the boss, and a communication hole arranged on the outer periphery of the boss, the liquid injection groove is communicated with the liquid injection hole, the liquid flow hole extends from the outer periphery of the boss to the bottom of the sink, and the communication hole communicates the liquid injection groove with the liquid flow hole.

[0009] Further, the liquid flow hole is a plurality of holes extending from the outer periphery of the boss to the bottom of the sink, and the communication hole is a plurality of holes arranged on the outer periphery of the boss, and the plurality of communication holes respectively communicate the liquid injection groove with the plurality of liquid flow holes.

[0010] Further, the battery top cover further comprises a pole column mounted on the cover plate body, the top of the pole column extends outside the surface of the cover plate body, the bottom of the pole column extends inside the surface of the lower plastic, and the connecting piece connects the bottom of the pole column with the tab of the battery cell.

[0011] Further, the battery top cover further comprises an upper plastic mounted on the outer side of the cover plate body, the top of the pole column presses the upper plastic on the cover plate body, and the upper plastic is used for insulating the pole column and the cover plate body.

[0012] Further, the battery top cover further comprises a sealing ring mounted on the inner side of the cover plate body, the bottom of the pole column presses the sealing ring on the cover plate body, and the sealing ring is used for sealing the gap between the pole column and the cover plate body.

[0013] Further, the pole column comprises a pressing part extending outside the surface of the cover plate body, and a plug-in part vertically extending downward on the pressing part, the cross-sectional area of the pressing part is larger than that of the plug-in part, the bottom of the plug-in part extends inside the surface of the lower plastic, the pressing part presses the upper plastic on the cover plate body, and the plug-in part presses the sealing ring on the cover plate body.

[0014] Further, the bottom of the plug-in part is provided with a hollow hole, and the hollow hole is used for rotating riveting the bottom of the plug-in part on the inner side surface of the lower plastic.

[0015] The battery top cover has the following beneficial effects:

[0016] (1) The cover plate body of the battery top cover is provided with a liquid injection hole, and the lower plastic is provided with a hollow part opposite the liquid injection hole, when injecting liquid, the electrolyte flows through the liquid injection hole and the hollow part in sequence and then enters the battery shell, in this process, the hollow part can buffer the impact force of the electrolyte, thereby preventing the impact force of the electrolyte from causing damage to the pole piece of the battery cell, positive and negative electrode material falling off and other problems, and further ensuring the performance and service life of the lithium battery.

[0017] (2) The hollow part of the battery top cover includes a sink that extends downward on the lower plastic, and a liquid flow hole arranged at the bottom of the sink. The sink buffers the electrolyte, which can prevent the electrolyte from directly impacting the battery cell in the battery shell after being injected through the liquid injection hole, thereby buffering the impact force of the electrolyte and preventing the impact force of the electrolyte from causing damage to the pole piece of the battery cell, shedding of the positive and negative electrode materials, and other problems, thereby ensuring the performance and service life of the lithium battery.

[0018] (3) The lower plastic of the battery top cover is provided with a sink extending downward, and the bottom of the sink is provided with a liquid flow hole. Therefore, under the premise of ensuring that the electrolyte can flow out of the liquid flow hole, the sink can also prevent the falling sealing aluminum block, sealing nails and other objects from falling into the battery shell, further ensuring the performance and service life of the lithium battery.

[0019] (4) The hollow part of the battery top cover further includes a boss extending upward at the bottom of the sink. The boss and the sink buffer the electrolyte, which can further prevent the electrolyte from directly impacting the battery cell in the battery shell after being injected through the liquid injection hole, thereby preventing the impact force of the electrolyte from causing damage to the pole piece of the battery cell, shedding of the positive and negative electrode materials, and other problems, and ensuring the performance and service life of the lithium battery.

[0020] (5) The hollow part of the battery top cover further includes a liquid injection groove arranged at the top of the boss, and a communication hole arranged at the outer periphery of the boss. The electrolyte entering the internal space of the sink flows into the liquid injection groove at the top of the boss, and then flows to the liquid flow hole through the communication hole at the outer periphery of the boss, and finally flows out of the liquid flow hole. In this process, the boss and the sink buffer the electrolyte, which can prevent the electrolyte from directly impacting the battery cell in the battery shell after being injected through the liquid injection hole, thereby preventing the impact force of the electrolyte from causing damage to the pole piece of the battery cell, shedding of the positive and negative electrode materials, and other problems, and ensuring the performance and service life of the lithium battery.

[0021] (6) The liquid flow hole of the battery top cover is a plurality of holes extending from the outer periphery of the boss to the bottom of the sink, and the communication hole is a plurality of holes arranged at the outer periphery of the boss. The plurality of communication holes respectively communicate the liquid injection groove with the plurality of liquid flow holes. Therefore, the electrolyte flowing into the liquid injection groove can flow to the plurality of liquid flow holes through the plurality of communication holes, and finally flow out of the plurality of liquid flow holes, thereby improving the liquid injection efficiency of the lithium battery and enhancing the practicality of the battery top cover.

[0022] (7) The battery top cover sets a hollow hole at the bottom of the plug-in part of the pole, and extends the bottom of the plug-in part on the inner surface of the lower plastic by means of spin riveting, thereby realizing the fixed installation of the pole on the cover plate body and the lower plastic. Therefore, the height of the pole extending outside the cover plate body can be effectively reduced, and the weight of the pole can be reduced, thereby reducing the space occupied by the pole and the weight of the battery top cover, and further improving the capacity of the lithium battery and increasing the energy density of the lithium battery. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate the embodiments of the present application and, together with the description, serve to explain the principles of the present application. In these drawings, like reference numerals are used to represent similar elements.

[0024] Figure 1 It is a cross-sectional view of a battery top cover of the embodiment of the present application;

[0025] Figure 2 It is a structure view of the lower plastic of a battery top cover of the embodiment of the present application;

[0026] Figure 3 It is Figure 1 the enlarged view of A in the figure;

[0027] Figure 4 It is Figure 1 the enlarged view of B in the figure;

[0028] Figure 5 It is a structure view of the pole of a battery top cover of the embodiment of the present application.

[0029] In the figure: 1, cover plate main body; 11, liquid injection hole; 2, lower plastic; 21, hollow part; 211, sunken platform; 2111, liquid flow hole; 212, convex platform; 2121, liquid injection groove; 2122, communication hole; 3, pole; 31, compression part; 32, plug-in part; 321, hollow hole; 4, upper plastic; 5, sealing ring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application, and all other embodiments obtained by the person skilled in the art without creative labor based on the embodiments in the present application belong to the protection scope of the present application.

[0031] Please refer to Figures 1-5 The battery top cover of the embodiment of the present application comprises a cover plate main body 1 and a lower plastic 2 installed on the inner side of the cover plate main body 1, and the lower plastic 2 is used to insulate the cover plate main body 1 and the connecting sheet; the cover plate main body 1 is provided with a liquid injection hole 11, the liquid injection hole 11 is used to inject liquid into the battery shell, the position of the lower plastic 2 opposite to the liquid injection hole 11 is provided with a hollow part 21, the hollow part 21 is communicated with the liquid injection hole 11, and the hollow part 21 is used to buffer the impact force of the electrolyte when the electrolyte flows.

[0032] In the application, the battery top cover comprises a cover plate body 1 and a lower plastic 2, the lower plastic 2 is fixedly installed on the inner side of the cover plate body 1, so that the cover plate body 1 and the connecting piece are insulated by the lower plastic 2 when the connecting piece connects the cover plate body 1 and the electrode lug of the battery cell. In the process of manufacturing the lithium battery, the liquid injection of the lithium battery is usually carried out after the battery top cover is closed to the battery shell, so it is necessary to set a liquid injection hole on the battery top cover for the injection of the electrolyte.

[0033] In the prior art, the liquid injection hole set on the battery top cover is usually a straight-through hole, when the liquid injection is carried out, the electrolyte directly flows into the battery shell through the liquid injection hole, the impact force of the electrolyte acts on the battery cell in the battery shell, which may cause the problems such as the damage of the electrode plate of the battery cell, the falling of the positive and negative electrode materials, etc., thereby affecting the performance and service life of the lithium battery.

[0034] Therefore, in the application, the liquid injection hole 11 is set on the cover plate body 1, the lower plastic 2 is provided with a hollow part 21, when the lower plastic 2 is fixedly installed on the inner side of the cover plate body 1, the hollow part 21 is opposite to the liquid injection hole 11. When the liquid injection is carried out, the electrolyte enters the battery shell after flowing through the liquid injection hole 11 and the hollow part 21 in sequence. In this process, the hollow part 21 can buffer the impact force of the electrolyte, thereby preventing the impact force of the electrolyte from causing the problems such as the damage of the electrode plate of the battery cell, the falling of the positive and negative electrode materials, etc., and further ensuring the performance and service life of the lithium battery.

[0035] In the application, since the cover plate body 1 is used to close the opening of the battery shell, the side of the cover plate body 1 close to the battery shell is regarded as the inner side, the side of the cover plate body 1 away from the battery shell is regarded as the outer side, and the "outer side" and "inner side" mentioned in the whole text are based on this.

[0036] In the embodiment, the hollow part 21 comprises a sink 211 extending downward on the lower plastic 2, and a liquid flow hole 2111 arranged at the bottom of the sink 211, the top of the sink 211 is communicated with the liquid injection hole 11, and the liquid flow hole 2111 communicates the bottom of the sink 211 with the outside. In the application, the hollow part 21 comprises the sink 211 and the liquid flow hole 2111, the sink 211 extends downward on the lower plastic 2, and the liquid flow hole 2111 is arranged at the bottom of the sink 211.

[0037] Since the top of the sink 211 is communicated with the liquid injection hole 11 on the cover plate body 1 when the lower plastic 2 is fixedly installed on the inner side of the cover plate body 1, the injected electrolyte enters the internal space of the sink 211 after flowing through the liquid injection hole 11. Since the liquid flow hole 2111 communicates the bottom of the sink 211 with the outside, the electrolyte in the internal space of the sink 211 can enter the battery shell through the liquid flow hole 2111 after the battery top cover is closed to the battery shell, and the liquid injection of the lithium battery is completed.

[0038] In the process that the electrolyte flows through the internal space of the sink 211 and then flows out from the liquid flow hole 2111 at the bottom of the sink 211, the electrolyte is buffered by the sink 211, which can prevent the electrolyte from directly impacting the battery cell in the battery shell after being injected through the liquid injection hole 11, thereby buffering the impact force of the electrolyte and preventing the impact force of the electrolyte from causing problems such as damage to the pole piece of the battery cell and shedding of the positive and negative electrode materials, thereby ensuring the performance and service life of the lithium battery.

[0039] In the process of manufacturing the lithium battery, after the liquid injection is completed, the liquid injection hole on the battery top cover is usually closed by a sealing aluminum block, a sealing nail or the like, thereby completing the sealing of the battery shell and preventing the electrolyte in the battery shell from leaking from the liquid injection hole during subsequent use of the lithium battery, thereby affecting the use of the lithium battery. Since the liquid injection hole provided on the battery top cover in the prior art is usually a through hole, the sealing aluminum block, the sealing nail or the like used to close the liquid injection hole has a risk of falling into the battery shell, thereby affecting the performance and service life of the lithium battery.

[0040] In the present application, the sink 211 extending downward is provided on the lower plastic 2, and the liquid flow hole 2111 is provided at the bottom of the sink 211, so that the sink 211 can prevent the fallen sealing aluminum block, sealing nail or the like from falling into the battery shell while ensuring that the electrolyte can flow out of the liquid flow hole 2111, thereby further ensuring the performance and service life of the lithium battery.

[0041] Further, in the present embodiment, the hollow part 21 further includes a boss 212 extending upward at the bottom of the sink 211. Since the top of the sink 211 is in communication with the liquid injection hole 11 on the cover plate body 1, and the boss 212 is coaxial with the liquid injection hole 11, the electrolyte flowing through the liquid injection hole 11 first enters the internal space of the sink 211, then flows through the boss 212, and finally flows out of the liquid flow hole 2111 under the guidance of the boss 212.

[0042] In this process, the electrolyte is buffered by the boss 212 and the sink 211, which can further prevent the electrolyte from directly impacting the battery cell in the battery shell after being injected through the liquid injection hole 11, thereby preventing the impact force of the electrolyte from causing problems such as damage to the pole piece of the battery cell and shedding of the positive and negative electrode materials, and ensuring the performance and service life of the lithium battery.

[0043] Further, in the embodiment, the hollow part 21 further comprises a liquid injection groove 2121 arranged on the top of the boss 212, and a communication hole 2122 arranged on the outer periphery of the boss 212, the liquid injection groove 2121 is communicated with the liquid injection hole 11, the flow liquid hole 2111 extends from the outer periphery of the boss 212 to the bottom of the sunken part 211, and the communication hole 2122 communicates the liquid injection groove 2121 with the flow liquid hole 2111. In the previous embodiment, it is mentioned that the electrolyte flowing through the liquid injection hole 11 first enters the internal space of the sunken part 211, then flows through the boss 212, and finally flows out from the flow liquid hole 2111 under the guidance of the boss 212.

[0044] Specifically, the electrolyte entering the internal space of the sunken part 211 flows into the liquid injection groove 2121 on the top of the boss 212, then flows to the flow liquid hole 2111 through the communication hole 2122 on the outer periphery of the boss 212, and finally flows out from the flow liquid hole 2111. In this process, the boss 212 and the sunken part 211 buffer the electrolyte, which can prevent the electrolyte from being injected through the liquid injection hole 11 and directly impacting the battery cell located in the battery shell, thereby preventing the impact force of the electrolyte from causing damage to the pole piece of the battery cell, positive and negative electrode material falling off, and other problems, and ensuring the performance and service life of the lithium battery.

[0045] In the embodiment, the flow liquid hole 2111 is a plurality of flow liquid holes extending from the outer periphery of the boss 212 to the bottom of the sunken part 211, and the communication hole 2122 is a plurality of communication holes arranged on the outer periphery of the boss 212, and the plurality of communication holes 2122 respectively communicate the liquid injection groove 2121 with the plurality of flow liquid holes 2111. Therefore, the electrolyte flowing into the liquid injection groove 2121 can flow to the plurality of flow liquid holes 2111 through the plurality of communication holes 2122, and finally flow out from the plurality of flow liquid holes 2111, thereby improving the liquid injection efficiency of the lithium battery and enhancing the practicality of the battery top cover.

[0046] In the embodiment, the battery top cover further comprises a pole 3, and the pole 3 is installed on the cover plate body 1. Since the top of the pole 3 extends on the outer surface of the cover plate body 1 and the bottom of the pole 3 extends on the inner surface of the lower plastic 2, before the battery top cover is closed on the battery shell, the tab of the battery cell is connected to the bottom of the pole 3 through the connecting sheet; after the battery top cover is closed on the battery shell, the top of the pole 3 is connected to the external circuit, thereby realizing the leading-out of the positive and negative electrodes of the battery cell and ensuring the charging and discharging function of the lithium battery.

[0047] When the positive and negative electrodes of the battery cell are led out through the pole 3, insulation treatment needs to be performed on the cover plate body 1 and the pole 3 to prevent the cover plate body 1 from being electrified and affecting the use of the lithium battery. On the inner side of the cover plate body 1, the lower plastic 2 is fixedly installed on the cover plate body 1, and the bottom of the pole 3 extends on the inner surface of the lower plastic 2, thereby enabling the lower plastic 2 to perform insulation treatment on the pole 3 and the cover plate body 1 on the inner side.

[0048] In the embodiment, the battery top cover further comprises an upper plastic 4, which is installed on the outer side of the cover plate body 1 and extends on the outer side surface of the cover plate body 1 through the top of the pole 3, and the upper plastic 4 is pressed on the cover plate body 1 to fix the upper plastic 4 on the cover plate body 1, so that the pole 3 and the cover plate body 1 are insulated on the outer side through the upper plastic 4, thereby preventing the cover plate body 1 from being electrified and affecting the use of the lithium battery.

[0049] In the embodiment, the battery top cover further comprises a sealing ring 5, which is installed on the inner side of the cover plate body 1 and extends on the inner side surface of the lower plastic 2 through the bottom of the pole 3, and the sealing ring 5 is pressed on the cover plate body 1 to fix the sealing ring 5 on the cover plate body 1, so that the gap between the pole 3 and the cover plate body 1 is sealed through the sealing ring 5, preventing the electrolyte in the battery shell from leaking from the gap between the pole 3 and the cover plate body 1, thereby ensuring the safety performance of the lithium battery.

[0050] In the embodiment, the pole 3 comprises a pressing part 31 extending on the outer side surface of the cover plate body 1 and a plug-in part 32 vertically extending downward on the pressing part 31, and the cross-sectional area of the pressing part 31 is larger than that of the plug-in part 32, the bottom of the plug-in part 32 extends on the inner side surface of the lower plastic 2, the pressing part 31 presses the upper plastic 4 on the cover plate body 1, and the plug-in part 32 presses the sealing ring 5 on the cover plate body 1.

[0051] In the application, the pole 3 comprises a pressing part 31 and a plug-in part 32, the plug-in part 32 vertically extends downward on the pressing part 31, and the cross-sectional area of the pressing part 31 is larger than that of the plug-in part 32. When assembling the top cover structure, the upper plastic 4 is first installed on the outer side of the cover plate body 1, then the plug-in part 32 of the pole 3 is sequentially penetrated through the upper plastic 4 and the cover plate body 1, then the sealing ring 5 is installed on the inner side of the cover plate body 1, the bottom of the plug-in part 32 penetrates the sealing ring 5, and finally the bottom of the plug-in part 32 extends on the inner side surface of the lower plastic 2, so that the pole 3 is fixedly installed on the cover plate body 1 and the lower plastic 2, and the upper plastic 4 and the sealing ring 5 are fixed on the cover plate body 1 by abutting the pressing part 31 of the pole 3 with the upper plastic 4 and the plug-in part 32 with the sealing ring 5.

[0052] Specifically, in the embodiment, the plug-in part 32 of the pole column 3 is fixedly connected with the cover plate body 1 by means of spin riveting. The hollow hole 321 is arranged at the bottom of the plug-in part 32, the sealing ring 5 is arranged at the inner side of the cover plate body 1, the bottom of the plug-in part 32 penetrates through the sealing ring 5, and then the bottom of the plug-in part 32 is spin riveted along the outer periphery of the hollow hole 321 by means of the spin riveting equipment, so that the bottom of the plug-in part 32 extends at the inner side surface of the lower plastic 2, thereby forming the U-shaped bayonet between the plug-in part 32 and the pressing part 31, the upper end of the U-shaped bayonet is located at the outer side of the cover plate body 1, and the lower end is located at the inner side of the lower plastic 2, thereby realizing the fixed installation of the pole column 3 on the cover plate body 1 and the lower plastic 2.

[0053] In the prior art, when the pole column 3 is fixedly installed on the cover plate, the pole column 3 is usually fixedly connected with the cover plate by means of welding at the outer side of the cover plate. Due to the requirement of welding, the pole column 3 needs to extend a certain height at the outer side of the cover plate, thereby causing that the pole column 3 extending at the outer side of the cover plate occupies a large space, which is not conducive to increasing the energy density of the lithium battery and affects the stability of the installation of the pole column 3 on the cover plate.

[0054] In the present application, the hollow hole 321 is arranged at the bottom of the plug-in part 32 of the pole column 3, and the bottom of the plug-in part 32 is extended at the inner side surface of the lower plastic 2 by means of spin riveting, thereby realizing the fixed installation of the pole column 3 on the cover plate body 1 and the lower plastic 2. Therefore, the height of the pole column 3 extending at the outer side of the cover plate body 1 can be effectively reduced, and the weight of the pole column 3 can be reduced, thereby reducing the space occupied by the pole column 3 and the weight of the battery top cover, and thereby being conducive to improving the capacity of the lithium battery and increasing the energy density of the lithium battery.

[0055] The above-described content can be implemented alone or in various combinations, and these variants are within the protection scope of the present application.

[0056] It should be noted that, in the present document, the relational terms such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between or among such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0057] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not limit it. Although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A battery top cover characterized by: The battery top cover comprises a cover plate body (1) and a lower plastic (2) installed on the inner side of the cover plate body (1), the lower plastic (2) is used for insulating the cover plate body (1) and the connecting piece; the cover plate body (1) is provided with a liquid injection hole (11) for injecting liquid into the battery shell, the position of the lower plastic (2) opposite to the liquid injection hole (11) is provided with a hollow part (21), the hollow part (21) is communicated with the liquid injection hole (11), and the hollow part (21) is used for buffering the impact force of the electrolyte when the electrolyte flows.

2. A battery top cover as defined in claim 1, characterized in that: The hollow part (21) comprises a sunken platform (211) extending downward on the lower plastic (2) and a liquid flow hole (2111) provided at the bottom of the sunken platform (211), the top of the sunken platform (211) is communicated with the liquid injection hole (11), and the liquid flow hole (2111) communicates the bottom of the sunken platform (211) with the outside.

3. A battery top cover as defined in claim 2, characterized in that: The hollow part (21) further comprises a convex platform (212) extending upward at the bottom of the sunken platform (211), the convex platform (212) is coaxial with the liquid injection hole (11), and the electrolyte flowing through the liquid injection hole (11) flows out from the liquid flow hole (2111) under the guidance of the convex platform (212).

4. A battery top cover as defined in claim 3, characterized in that: The hollow part (21) further comprises a liquid injection groove (2121) provided at the top of the convex platform (212) and a communication hole (2122) provided at the outer periphery of the convex platform (212), the liquid injection groove (2121) is communicated with the liquid injection hole (11), the liquid flow hole (2111) extends from the outer periphery of the convex platform (212) to the bottom of the sunken platform (211), and the communication hole (2122) communicates the liquid injection groove (2121) with the liquid flow hole (2111).

5. A battery top cover as defined in claim 4, characterized in that: The liquid flow hole (2111) is a plurality of holes extending from the outer periphery of the convex platform (212) to the bottom of the sunken platform (211), and the communication hole (2122) is a plurality of holes provided at the outer periphery of the convex platform (212), and the plurality of communication holes (2122) respectively communicate the liquid injection groove (2121) with the plurality of liquid flow holes (2111).

6. A battery top cover as defined in claim 1, wherein: The battery top cover further comprises a pole (3) installed on the cover plate body (1), the top of the pole (3) extends on the outer side surface of the cover plate body (1), the bottom of the pole (3) extends on the inner side surface of the lower plastic (2), and the connecting piece connects the bottom of the pole (3) with the tab of the battery cell.

7. A battery top cover as defined in claim 6, characterized in that: The battery top cover further comprises an upper plastic (4) installed on the outer side of the cover plate body (1), the top of the pole (3) presses the upper plastic (4) on the cover plate body (1), and the upper plastic (4) is used for insulating the pole (3) and the cover plate body (1).

8. A battery top cover as defined in claim 7, characterized in that: The battery top cover further comprises a sealing ring (5) installed on the inner side of the cover plate body (1), the bottom of the pole (3) presses the sealing ring (5) on the cover plate body (1), and the sealing ring (5) is used for sealing the gap between the pole (3) and the cover plate body (1).

9. A battery top cover as defined in claim 8, characterized in that: The pole post (3) comprises a pressing part (31) extending outside the cover plate body (1), and a plug-in part (32) vertically extending downwards on the pressing part (31), the cross-sectional area of the pressing part (31) is larger than that of the plug-in part (32), the bottom of the plug-in part (32) extends on the inside surface of the lower plastic (2), the pressing part (31) presses the upper plastic (4) on the cover plate body (1), and the plug-in part (32) presses the sealing ring (5) on the cover plate body (1).

10. A battery top cover as defined in claim 9, characterized in that: The bottom of the plug-in part (32) is provided with a hollow hole (321), and the hollow hole (321) is used for spin riveting the bottom of the plug-in part (32) on the inside surface of the lower plastic (2).

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