Battery cover plate assembly with liquid supplementing function

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cover plate assembly with a liquid supplementing function, which comprises a cover plate, a liquid supplementing liquid bag and a sealing cover, wherein the liquid supplementing liquid bag is arranged on the inner side, close to the battery cell, of the cover plate; a puncture hole communicated with the inner side and the outer side of the cover plate is formed in the cover plate, and the cover plate can reach the liquid supplementing liquid bag through the puncture hole; and the sealing cover is detachably fixed on the cover plate and covers the puncture hole. Therefore, when the liquid supplementing sac is arranged on the inner side of the cover plate, a liquid injection channel does not need to be opened and secondary welding does not need to be carried out during liquid supplementing, the puncturing cone is arranged in the cover plate, the puncturing cone only needs to be screwed down to move downwards to puncture the liquid supplementing sac, the liquid supplementing process is completed in the battery, the battery is not damaged, the liquid supplementing time is controllable, and the liquid supplementing efficiency is improved. And liquid can be supplemented in a targeted manner according to different battery performance diving opportunities, and the supplemented media are diversified and can be supplemented in a targeted manner according to different battery use working conditions.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cover assembly with a liquid replenishing function. Background Art

[0002] At present, in recent years, the demand for green energy has become increasingly vigorous. Lithium batteries have been rapidly developed due to their green and environmentally friendly advantages. The application scenarios involve power, energy storage, 3C and other aspects of life. Under fierce competition, outstanding battery performance and cycle life can bring market advantages. The current cycle life of lithium batteries is basically less than or equal to about 5,000 times. In the later stage of the battery cycle, due to the accumulation of side reactions and the continuous repair of the solid electrolyte interface film (SEI film), the electrolyte is continuously consumed until it dries up, and the battery capacity shows a significant attenuation trend (commonly known as capacity "diving").

[0003] When disassembling the capacity-decayed battery, it was found that there were black spots of lithium on the interface of the negative electrode. When using a non-decayed battery with the same number of cycles and refilling the electrolyte for testing, the battery still worked normally, indicating that the main reason for the lithium-ion battery to dive is the exhaustion of the electrolyte. Therefore, improving the battery's own electrolyte retention ability or developing a reasonable and efficient electrolyte replenishment structure has become the key to improving the battery's cycle life. Utility Model Content

[0004] The purpose of this application is to provide a battery cover assembly with a fluid replenishment function, which to a certain extent solves the technical problem in the prior art that an efficient fluid replenishment structure is urgently needed to be developed, which becomes the key to improving the battery cycle life.

[0005] The present application provides a battery cover assembly with a fluid replenishment function, comprising: a cover, a fluid replenishment bag and a sealing cover; wherein the fluid replenishment bag is arranged on the inner side of the cover close to the battery cell; the cover is formed with a puncture hole connected to both the inner side and the outer side thereof, and the fluid replenishment bag can be reached through the puncture hole; the sealing cover is detachably fixed on the cover and covers the puncture hole.

[0006] In the above technical solution, further, the battery cover assembly with a fluid replenishment function also includes a bracket, the bracket is arranged on the inner side of the cover close to the battery cell, and the bracket forms an installation cavity connected to the puncture hole, and the fluid replenishment bag is arranged in the installation cavity; the bracket forms a liquid outlet hole connected to the installation cavity.

[0007] In any of the above technical solutions, further, a positioning protrusion is formed on one side of the bracket close to the battery core.

[0008] In any of the above technical solutions, further, the bracket and the cover plate are connected by at least one of hot riveting and gluing.

[0009] In any of the above technical solutions, further, the material of the bracket is polypropylene.

[0010] In any of the above technical solutions, further, the battery cover assembly with liquid replenishing function also includes a puncture cone, and the puncture cone is installed in the puncture hole and is threadedly connected to the puncture hole.

[0011] In any of the above technical solutions, further, an auxiliary mounting protrusion is formed on the outer side of the cover plate away from the battery core, the auxiliary mounting protrusion is formed with a through first puncture hole, and a through second puncture hole is formed on the structure of the cover plate located below the auxiliary mounting protrusion, and the second puncture hole is connected to the first puncture hole to form the puncture hole;

[0012] The upper structure of the puncture cone is arranged in the first puncture hole and is threadedly connected to the first puncture hole, and the lower structure of the puncture cone is arranged in the second puncture hole; the sealing cover is detachably connected to the auxiliary mounting protrusion.

[0013] In any of the above technical solutions, further, the first puncture hole and the second puncture hole are both circular holes, and the diameters of the two holes are different, so that a step surface is formed between the first puncture hole and the second puncture hole;

[0014] The battery cover assembly with liquid replenishing function also includes a first sealing ring, which is installed on the step surface, and the puncture cone is inserted in the first sealing ring, and the first sealing ring is respectively interference fit with the puncture cone and the inner wall of the first puncture hole or the second puncture hole in contact with it.

[0015] In any of the above technical solutions, further, the diameter of the first puncture hole is greater than the diameter of the second puncture hole.

[0016] In any of the above technical solutions, further, the puncture cone includes an assembly part, a sealing part and a pointed part which are connected in sequence; wherein the assembly part is arranged in the first puncture hole and is threadedly connected to the first puncture hole; the pointed part is arranged in the second puncture hole; and the first sealing ring is sleeved on the outside of the sealing part.

[0017] In any of the above technical solutions, further, the cover is in the shape of a cap, and is buckled on the auxiliary mounting protrusion.

[0018] In any of the above technical solutions, further, the cover is threadably connected to the auxiliary mounting protrusion.

[0019] In any of the above technical solutions, further, the battery cover assembly with liquid replenishing function also includes a second sealing ring, and the second sealing ring is arranged at the top of the installation space of the cover and is arranged against the top of the protrusion.

[0020] In any of the above technical solutions, further, a tool connection groove is provided on the top of the puncture cone away from the battery core.

[0021] Compared with the prior art, the beneficial effects of this application are:

[0022] In the battery cover assembly with fluid replenishment function provided by the present application, a fluid replenishment bag is arranged on the inner side of the cover. When replenishing fluid, there is no need to open the injection channel and perform secondary welding. In addition, a puncture cone is arranged inside the cover. It is only necessary to tighten the puncture cone to move the puncture cone downward and puncture the fluid replenishment bag. The fluid replenishment process is completed inside the battery without damaging the battery. In addition, the timing of fluid replenishment is controllable and targeted fluid replenishment can be performed according to the timing of different battery performance dives. In addition, the supplementary medium is diverse and targeted medium replenishment can be performed according to different battery usage conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 An exploded view of a battery cover assembly with a liquid replenishing function provided in an embodiment of the present application;

[0025] Figure 2 An assembly diagram of a battery cover assembly with a liquid replenishing function provided in an embodiment of the present application;

[0026] Figure 3 A cross-sectional view of a battery cover assembly with a liquid replenishing function provided in an embodiment of the present application;

[0027] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A;

[0028] Figure 5 An assembly diagram of the cover plate and the bracket provided in the embodiment of the present application;

[0029] Figure 6 Another assembly diagram of the cover plate and the bracket provided in an embodiment of the present application.

[0030] Reference numerals:

[0031] 1-cover plate, 11-auxiliary installation protrusion, 12-puncture hole, 121-first puncture hole, 122-second puncture hole, 2-bracket, 21-mounting plate, 22-positioning protrusion, 23-mounting box part, 231-liquid outlet hole, 24-through hole, 25-mounting cavity, 3-fluid replenishing liquid bag, 4-puncture cone, 41-assembly part, 411-tool connection groove, 42-sealing part, 43-pointed part, 5-first sealing ring, 6-second sealing ring, 7-cover, 8-pole, 9-fastening bolt. DETAILED DESCRIPTION

[0032] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0033] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0034] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0035] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Refer to the following Figures 1 to 6 A battery cover assembly with a liquid replenishing function according to some embodiments of the present application is described.

[0038] See also Figures 1 to 6 As shown, an embodiment of the present application provides a battery cover assembly with a fluid replenishment function, comprising: a cover 1, a fluid replenishment capsule 3 and a sealing cover 7; wherein, the fluid replenishment capsule 3 is arranged on the inner side of the cover 1 close to the battery cell; the cover 1 is formed with a puncture hole 12 connected to both the inner and outer sides thereof, and the fluid replenishment capsule 3 can be reached through the puncture hole 12; the sealing cover 7 is detachably fixed on the cover 1, and the sealing cover 7 covers the puncture hole 12.

[0039] Based on the structure described above, it can be seen that when the battery cover assembly with a liquid replenishing function provided by the present application is applied to a battery, and when it is necessary to replenish the electrolyte inside the battery, the cover 7 can be opened first, and then a blunt object (such as the piercing cone 4 described below or other parts with a pointed tip) can be used. ) The liquid replenishing bag 3 is extended through the puncture hole 12 and the liquid replenishing bag 3 is punctured, so that the electrolyte in the liquid replenishing bag 3 flows out to infiltrate the battery cell below, and then the cover 7 can be re-fixed on the cover plate 1 to cover the puncture hole 12 to prevent leakage.

[0040] It can be seen that the battery cover assembly with a refilling function provided in the present application is designed with a refilling liquid capsule 3 on the side of the cover 1 close to the battery cell, which can replenish the electrolyte in a timely and lossless manner according to the battery performance trend to improve the battery life. It has a simple structure and low cost. When refilling, there is no need to open the injection channel and weld it again, and the operation is simple and convenient.

[0041] It should be noted that the inner side of the cover plate 1 refers to the side close to the battery cell, that is, the lower side of the cover plate 1 along the height direction of the cover plate 1, and the outer side of the cover plate 1 refers to the side away from the battery cell, that is, the upper side of the cover plate 1 along the height direction of the cover plate 1.

[0042] In addition, the cover plate 1 generally includes a plain aluminum sheet and a lower plastic, the lower plastic is fixed to the lower surface of the plain aluminum sheet and is compatible with the lower surface of the plain aluminum sheet, and preferably, the aforementioned puncture hole 12 needs to penetrate the plain aluminum sheet and the lower plastic at the same time. Of course, the structure of the cover plate 1 is not limited to this, and can also be designed according to actual needs.

[0043] In this embodiment, preferably, Figures 1 to 3 As shown, the battery cover assembly with a fluid replenishment function also includes a bracket 2, which is arranged on the inner side of the cover 1 close to the battery cell, and the bracket 2 forms a mounting cavity 25 connected to the puncture hole 12, and the fluid replenishment capsule 3 is arranged in the mounting cavity 25, that is, the bracket 2 is also formed with a through hole 24, and the through hole 24 is respectively connected to the mounting cavity 25 and the puncture hole 12, thereby facilitating the puncture cone 4 or other blunt instruments described below to enter the mounting cavity 25, and then puncture the fluid replenishment capsule 3; the bracket 2 is formed with a liquid outlet hole 231 connected to the mounting cavity 25.

[0044] According to the structure described above, the support 2 plays a role in supporting and protecting the fluid replenishment capsule 3, and can also abut against the top of the battery cell to prevent the battery cell from moving.

[0045] It should be noted that: not limited to the above-mentioned structure of adding the bracket 2, the bracket 2 can also be removed, and the fluid replenishment capsule 3 can be directly fixed on the side surface of the cover plate 1 close to the battery cell, that is, the lower surface, and preferably, the fluid replenishment capsule 3 can be fixed on the side surface of the cover plate 1 close to the battery cell by gluing, clamping or bolts, etc., which can be selected according to actual needs.

[0046] In this embodiment, preferably, Figure 1 As shown, the bracket 2 includes a mounting plate 21, a positioning protrusion 22 and a mounting box portion 23; wherein the positioning protrusion 22 and the mounting box portion 23 are both arranged on the inner side of the mounting plate 21 close to the battery core, and the mounting plate 21 is provided with the aforementioned through hole 24 penetrating the upper and lower surfaces thereof, which plays a role in avoiding the puncture cone 4; there are two positioning protrusions 22, which are respectively arranged on both sides of the mounting plate 21 along its length direction, and the mounting box portion 23 is arranged between the two supporting portions; a mounting opening is formed on the side of the mounting box portion 23, and the fluid infusion bag 3 is installed in the mounting box portion 23 via the mounting opening; an opening is formed on the top of the mounting box portion 23, and the aforementioned mounting plate 21 covers the opening;

[0047] The battery cover assembly with liquid replenishing function also includes a pole 8, which is inserted into the mounting plate 21, and a first avoidance hole is opened on the mounting plate 21. The pole 8 extends between the mounting box part 23 and one of the supporting parts through the first avoidance hole.

[0048] According to the structure described above, the aforementioned positioning protrusion 22 can resist the battery cell to prevent the battery cell from moving around in the shell. In addition, the outside of the battery cell is often wrapped with an insulating film, namely Mylar film. When the material of the positioning protrusion 22 is polypropylene described below, it can be heat-fused together with the Mylar film, thereby playing a role in fixing the Mylar film; the mounting box portion 23 and the mounting plate 21 surround the aforementioned mounting cavity 25, which is mainly used for installing the fluid infusion bag 3; the mounting plate 21 fits with the inner side of the cover plate 1, namely the lower surface, and provides an installation position for the fastening bolts 9, so that the bracket 2 and the cover plate 1 are assembled more firmly.

[0049] Further, preferably, the mounting plate 21, the positioning protrusion 22 and the mounting box portion 23 are an integrated structure with high overall strength and are not easily damaged. Of course, the present invention is not limited thereto.

[0050] It should be noted that the structure of the bracket 2 is not limited to the above, and it can also adopt the following structure: the bracket 2 includes a positioning protrusion 22, a mounting box portion 23 and a connecting plate, wherein the number of the positioning protrusions 22 is two, and they are respectively arranged on both sides along the length direction of the cover plate 1, and the mounting box portion 23 is arranged between the two positioning protrusions 22, and each positioning protrusion 22 is connected to the side of the mounting box portion 23 through a connecting plate, and the connecting plate needs to have an avoidance through hole for avoiding the pole 8, etc.

[0051] In this embodiment, preferably, Figure 1 and Figure 4 As shown, the battery cover assembly with the liquid replenishing function also includes a puncture cone 4, which is installed in the puncture hole 12 and is threadedly connected to the puncture hole 12.

[0052] According to the structure described above, when it is necessary to fill the battery with liquid, the cover 7 can be opened first, and then the puncture cone 4 can be screwed with a tool so that the puncture cone 4 moves toward the liquid replenishing capsule 3, that is, moves downward. Finally, the puncture cone 4 will puncture the liquid replenishing capsule 3 to replenish the battery. It can be seen that this process is simple and convenient to operate, and there is no need to prepare tools by yourself. Moreover, the puncture cone 4 does not need to be taken out after use, and is directly sealed inside the battery, and also plays the role of sealing the puncture hole 12.

[0053] Furthermore, preferably, a tool connecting groove 411 is formed on the top of the puncture cone 4 facing away from the battery cell, and a tool such as a screwdriver can be connected to the tool connecting groove 411, with the help of which the puncture cone 4 can be quickly rotated to move downward and puncture the fluid replenishing bag, and preferably, the tool connecting groove 411 is a cross groove, a flat groove or a hexagonal groove, etc.

[0054] Of course, the present invention is not limited thereto, and the puncture cone 4 may not be provided, that is, the fluid infusion bag 3 may be punctured by using other blunt objects with sharp points or sharp steel wires.

[0055] In this embodiment, preferably, Figure 4 and Figure 5 As shown, an auxiliary mounting protrusion 11 is formed on the outer side of the cover plate 1 away from the battery cell (when the cover plate 1 includes a plain aluminum sheet, preferably, an auxiliary mounting protrusion 11 is formed on the outer side of the plain aluminum sheet away from the battery cell, of course, not limited to this), the auxiliary mounting protrusion 11 is formed with a through first puncture hole 121, and a through second puncture hole 122 is formed on the structure of the cover plate 1 located below the auxiliary mounting protrusion 11, and the second puncture hole 122 is connected with the first puncture hole 121 to form a puncture hole 12;

[0056] The upper structure of the puncturing cone 4 is disposed in the first puncturing hole 121 and is threadably connected to the first puncturing hole 121 , and the lower structure of the puncturing cone 4 is disposed in the second puncturing hole 122 ; the sealing cover 7 is detachably connected to the auxiliary mounting protrusion 11 .

[0057] According to the structure described above, the auxiliary installation protrusion 11 provides an installation position for installing the sealing cover 7 and the piercing cone 4.

[0058] Further, preferably, the auxiliary installation protrusion 11 is cylindrical, and a first puncture hole 121 is opened at the center thereof.

[0059] Further, preferably, the puncture hole 12 extends along the height direction of the cover plate 1, that is, the thickness direction of the cover plate 1, to facilitate the processing, manufacturing and installation of the puncture cone 4. On this basis, along the height direction of the cover plate 1, that is, along the height direction of the auxiliary mounting protrusion 11, the first puncture hole 121 penetrates the top and bottom of the auxiliary mounting protrusion 11, and the first puncture hole 121 penetrates the top and bottom of the cover plate structure below the auxiliary mounting protrusion 11. Of course, not limited to this, the puncture hole 12 can also extend in a direction that forms an acute angle with the height direction of the cover plate 1, that is, the puncture hole 12 is inclined, which is selected according to actual needs.

[0060] On the basis of the foregoing, preferably, the second puncture hole 122 is located directly below the first puncture hole 121, so as to ensure that the puncture path is arranged along the thickness direction of the cover plate 1, that is, the vertical direction, without bending, etc., which facilitates the movement of the puncture cone 4.

[0061] In this embodiment, preferably, Figure 4 As shown, the first puncture hole 121 and the second puncture hole 122 are both circular holes, and the diameters of the two holes are different, so that a step surface is formed between the first puncture hole 121 and the second puncture hole 122, and preferably, the diameter of the first puncture hole 121 is larger than the diameter of the second puncture hole 122, that is, a puncture hole 12 that is larger at the top and smaller at the bottom is formed;

[0062] The battery cover assembly with liquid replenishing function also includes a first sealing ring 5, which is installed on the step surface, and the puncture cone 4 is inserted in the first sealing ring 5, and the first sealing ring 5 is respectively interference fit with the puncture cone 4 and the inner wall of the first puncture hole 121 or the second puncture hole 122 in contact, that is, along the diameter direction of the first puncture hole 121, the first sealing ring 5 has a certain amount of compression, thereby playing a sealing role.

[0063] According to the structure described above, the bottom of the first sealing ring 5 rests on the step surface formed between the first puncture hole 121 and the second puncture hole 122. This step surface can be used to support the first sealing ring 5, so that the first sealing ring 5 and the cover plate 1 are assembled more firmly and stably.

[0064] Of course, it is not limited to the above-mentioned diameter of the first puncture hole 121 being larger than the diameter of the second puncture hole 122. The diameter of the first puncture hole 121 can also be smaller than the diameter of the second puncture hole 122, that is, a stepped hole that is smaller at the top and larger at the bottom is formed. At this time, the top of the first sealing ring 5 rests on this step surface, which also serves to limit the first sealing ring 5.

[0065] In this embodiment, preferably, Figure 4 As shown, the puncture cone 4 includes an assembly portion 41, a sealing portion 42 and a pointed portion 43 which are connected in sequence; wherein the assembly portion 41 is arranged in the first puncture hole 121 and is threadedly connected to the first puncture hole 121, and the top of the assembly portion 41 is provided with the aforementioned tool connection groove 411; the pointed portion 43 is arranged in the second puncture hole 122; and the first sealing ring 5 is sleeved on the outside of the sealing portion 42.

[0066] According to the structure described above, it can be known that the threaded connection with the inner wall of the first puncture hole 121 can be achieved through the assembly part 41; the sealing part 42 is used to connect the assembly part 41 and the pointed part 43, and can cooperate with the first sealing ring 5 for sealing; the pointed part 43 is used to puncture the fluid infusion bag 3.

[0067] Further, preferably, the assembly portion 41, the sealing portion 42 and the pointed portion 43 are an integrated structure with high overall strength and are not easily broken or damaged.

[0068] In this embodiment, preferably, Figure 4 As shown, the cover 7 is in a cap shape and is buckled onto the auxiliary mounting protrusion 11 , and preferably, the cover 7 is threadably connected to the auxiliary mounting protrusion 11 .

[0069] According to the structure described above, it can be known that the cover 7 can eventually be buckled on the auxiliary mounting protrusion 11, that is, the cover 7 can completely wrap and cover the auxiliary mounting protrusion 11, thereby achieving a better sealing and protective effect, and the cover 7 and the auxiliary mounting protrusion 11 can be connected by threads, which is a detachable connection method, which is convenient for later disassembly and reassembly, and the operation is simple and convenient.

[0070] In this embodiment, preferably, Figure 4 As shown, the battery cover assembly with liquid replenishing function further includes a second sealing ring 6, and the second sealing ring 6 is arranged at the top of the installation space of the cover 7 and is arranged against the top of the protrusion.

[0071] According to the structure described above, the second sealing ring 6 plays a role in sealing the gap between the sealing cover 7 and the auxiliary mounting protrusion 11, further improving the sealing effect and avoiding the problem of liquid leakage.

[0072] Further, preferably, a slot is formed at the top of the installation space of the cover 7, and the second sealing ring 6 is snapped into the slot. Of course, it is not limited to this, and the second sealing ring 6 can also be connected to the cover 7 by gluing or other methods, which is selected according to actual needs.

[0073] In this embodiment, preferably, Figure 3 As shown, the bracket 2 and the cover plate 1 are connected by means of hot riveting bolts 9 .

[0074] According to the structure described above, the bracket 2 and the cover plate 1 are connected by hot riveting, the connection has higher strength and durability, the structure is more stable, and the process is relatively simple.

[0075] Of course, the connection method between the bracket 2 and the cover plate 1 is not limited to the above-mentioned hot riveting, and can also be connected by means of snap connection or gluing, etc., which is selected according to actual needs.

[0076] In this embodiment, preferably, the material of the bracket 2 is polypropylene, which has sufficient strength to stably support the fluid infusion bag 3, and is light in weight, which contributes to lightweight design. In addition, it also has insulating properties to avoid problems such as short circuits.

[0077] Of course, the material of the bracket 2 is not limited to the above, and can also be hard rubber or the like.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover assembly with a liquid replenishing function, characterized in that: include: A cover plate, a fluid replenishment bag and a sealing cover; wherein the fluid replenishment bag is arranged on the inner side of the cover plate close to the battery cell; the cover plate is formed with a puncture hole connected to both the inner side and the outer side thereof, and the fluid replenishment bag can be reached through the puncture hole; the sealing cover is detachably fixed on the cover plate and covers the puncture hole.

2. The battery cover assembly with liquid replenishment function according to claim 1, characterized in that: The battery cover plate assembly with a fluid replenishment function also includes a bracket, which is arranged on the inner side of the cover plate close to the battery cell, and the bracket forms an installation cavity connected to the puncture hole, and the fluid replenishment bag is arranged in the installation cavity; the bracket forms a liquid outlet hole connected to the installation cavity.

3. The battery cover assembly with liquid replenishment function according to claim 2, characterized in that: A positioning protrusion is formed on one side of the bracket close to the battery core; and / or The bracket is connected to the cover plate by at least one of hot riveting and gluing; and / or The material of the bracket is polypropylene.

4. The battery cover assembly with liquid replenishment function according to claim 1, characterized in that: The battery cover assembly with liquid replenishing function also includes a puncture cone, which is installed in the puncture hole and is connected to the puncture hole thread.

5. The battery cover assembly with liquid replenishment function according to claim 4, characterized in that: An auxiliary mounting protrusion is formed on the outer side of the cover plate away from the battery core, and a first penetrating hole is formed on the auxiliary mounting protrusion. A second penetrating hole is formed on the structure of the cover plate located below the auxiliary mounting protrusion, and the second puncture hole is connected with the first puncture hole to form the puncture hole. The upper structure of the puncture cone is arranged in the first puncture hole and is threadedly connected to the first puncture hole, and the lower structure of the puncture cone is arranged in the second puncture hole; the sealing cover is detachably connected to the auxiliary mounting protrusion.

6. The battery cover assembly with liquid replenishment function according to claim 5, characterized in that: The first puncture hole and the second puncture hole are both circular holes, and the diameters of the two holes are different, so that a step surface is formed between the first puncture hole and the second puncture hole; The battery cover assembly with liquid replenishing function also includes a first sealing ring, which is installed on the step surface, and the puncture cone is inserted in the first sealing ring, and the first sealing ring is respectively interference fit with the puncture cone and the inner wall of the first puncture hole or the second puncture hole in contact with it.

7. The battery cover assembly with liquid replenishment function according to claim 6, characterized in that: The diameter of the first puncture hole is greater than the diameter of the second puncture hole; and / or The puncture cone includes an assembly part, a sealing part and a pointed part which are connected in sequence; wherein the assembly part is arranged in the first puncture hole and is threadedly connected to the first puncture hole; the pointed part is arranged in the second puncture hole; and the first sealing ring is sleeved on the outside of the sealing part.

8. The battery cover assembly with liquid replenishment function according to claim 5, characterized in that: The sealing cover is in the shape of a cap and is buckled on the auxiliary mounting protrusion.

9. The battery cover assembly with liquid replenishment function according to claim 8, characterized in that: The sealing cover is threadably connected to the auxiliary mounting protrusion; and / or The battery cover plate assembly with liquid replenishing function also includes a second sealing ring, and the second sealing ring is arranged at the top of the installation space of the cover and is arranged against the top of the auxiliary installation protrusion.

10. The battery cover assembly with liquid replenishment function according to claim 4, characterized in that: A tool connection groove is arranged on the top of the puncturing cone away from the battery core.

11. The battery cover assembly with liquid replenishing function according to any one of claims 1 to 10, characterized in that: A protective sheet is provided in the puncture hole; and / or The puncture hole extends along the height direction of the cover plate.

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