Protective cover plate structure of lithium battery

Abstract

The utility model discloses a lithium battery protection cover plate structure, and aims to provide a lithium battery protection cover plate structure capable of improving the use safety. The cover plate comprises a cover plate body, a pressure relief hole is formed in the cover plate body, and pole holes are formed in the two sides of the pressure relief hole; the explosion-proof membrane and the pressure relief hole are detachably connected with a limiting seat, and the explosion-proof membrane is detachably connected with the limiting seat; the dustproof plate is arranged above the explosion-proof membrane and movably connected with the pressure relief hole, and the dustproof plate is connected with a dustproof net; the auxiliary support is detachably connected with the cover plate body, and the dustproof plate is movably connected with the auxiliary support; the wire fixing ring is detachably connected with the cover plate body, the pole hole is formed in the wire fixing ring, and the wire fixing ring is provided with a plurality of wire fixing grooves I; and the protective cover is detachably connected with the wire fixing ring, the protective cover is provided with a second wire fixing groove, and the position and the size of the second wire fixing groove are matched with those of the first wire fixing groove. The utility model has the beneficial effects that the safety protection is carried out on the pole connection and the pressure relief operation of the lithium battery through the cover plate structure; and the use safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery cover technology, and in particular to a lithium battery protective cover structure. Background Technology

[0002] A battery generally consists of a battery cover structure, a protective outer casing, and battery cells. The battery cover structure and the protective casing form a space to house the battery cells. As an important component of a power battery, the lithium battery cell, also known as a coiled core, includes a positive electrode, a separator, and a negative electrode. The separator separates the positive and negative electrode sheets, and there are protruding portions of the positive and negative electrode foils on both sides of the lithium battery cell. The cover is located on top of the lithium battery cell and is welded and sealed to it to form the battery. The aforementioned cover structure is a major component of a lithium battery, including the cover base, positive and negative terminals (connected by guide plates on conductive wires during power supply), and explosion-proof structures.

[0003] Chinese Patent Announcement No.: CN215731926 U, Announcement Date: February 1, 2022. This application proposes a lithium battery cover plate, comprising: a cover plate; electrode posts are mounted on both sides of the cover plate, and an explosion-proof structure is mounted in the middle of the cover plate. A groove is provided around the perimeter of the upper surface of the cover plate near the edge. The explosion-proof structure includes an explosion-proof sheet, a cover sheet, and a protective film arranged sequentially from bottom to top. The explosion-proof sheet includes a circular bottom, a conical waist, and an annular top. A top block is provided above the bottom and inside the cover sheet and the explosion-proof sheet. The shortcomings of this technical solution are that the electrode posts and the explosion-proof structure in the cover plate are easily affected or damaged by external impacts or vibrations, and the structural connection strength is low and it is not easy to maintain, leading to safety accidents such as power supply disconnection or even explosion.

[0004] In summary, the existing cover structure of lithium batteries has the disadvantage of low safety during use. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of existing lithium battery cover structures in terms of low safety during use, and provides a lithium battery protective cover structure that improves safety during use.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A lithium battery protective cover structure, including

[0008] The cover plate body is provided with a pressure relief hole, and there are pole holes on both sides of the pressure relief hole;

[0009] The explosion-proof membrane and pressure relief hole are detachably connected to the limit seat; the explosion-proof membrane and the limit seat are detachably connected.

[0010] Dustproof panel, the dustproof panel is placed above the explosion-proof membrane and is movably connected to the pressure relief hole, and the dustproof panel is connected to a dustproof net;

[0011] Auxiliary support, which is detachably connected to the cover plate, and the dustproof plate is movably connected to the auxiliary support;

[0012] The wire fixing ring is detachably connected to the cover plate body. The pole hole is placed inside the wire fixing ring. The wire fixing ring is provided with several wire fixing grooves.

[0013] The protective cover is detachably connected to the wire fixing ring. The protective cover has a second wire fixing groove, which is matched in position and size to the first wire fixing groove.

[0014] The cover plate connects to the lithium battery casing. A pressure relief hole is provided on the cover plate to connect to the explosion-proof membrane. This allows the membrane to rupture and release pressure when the internal pressure exceeds a set value, ensuring safety. The explosion-proof membrane is detachably connected to the pressure relief hole via a limiting seat, facilitating positioning, installation, and maintenance / replacement. A dustproof plate shields the pressure relief hole from dust and supports the dustproof mesh, ensuring heat dissipation during daily use while preventing dust and debris from entering the pressure relief hole, thus improving protection and safety. An auxiliary bracket connects to the cover plate, allowing the dustproof plate to move up and down via a guide, protecting the explosion-proof membrane from damage during normal use. When the explosion-proof membrane expands under high pressure, it allows for stable separation, ensuring pressure relief operations while preventing the structure from being ejected and causing dangerous impacts after an explosion. The auxiliary support is connected to the cover plate via a detachable connection, facilitating assembly and maintenance. The central axis of the wire-fixing ring coincides with the central axis of the terminal hole, which is used to install the terminal. The connection between the protective cover and the wire-fixing ring protects the terminal internally, preventing damage from impacts to the terminal. Furthermore, the wire-fixing grooves one and two clamp and secure the electrical connections, preventing pull on the wires connected to the terminal due to lithium battery vibrations, which could cause disconnection and power failure. This cover plate structure achieves the effects of providing safety protection for lithium battery terminal connections and pressure relief operations, improving operational safety, enhancing connection stability, preventing wire disconnection, facilitating assembly and maintenance, and extending service life.

[0015] Preferably, the inner wall of the pressure relief hole is provided with a limiting groove, the side wall of the limiting groove is provided with internal threads, and the outer surface of the limiting seat is provided with external threads. The limiting seat and the limiting groove are threadedly connected, and the explosion-proof membrane is placed between the limiting seat and the bottom of the limiting groove. The inner wall of the pressure relief hole positions the limiting seat through the limiting groove, so that the explosion-proof membrane is placed on the limiting groove and is pressed down by the limiting seat. During the connection, the explosion-proof membrane is gradually fixed and tightened through the threaded connection between the limiting seat and the inner wall of the limiting groove. This achieves the effect of quick and stable assembly of the explosion-proof membrane and facilitates subsequent maintenance.

[0016] Preferably, a clamping ring is connected to one side of the limiting seat, and a connecting groove is provided on the other side of the limiting seat. The clamping ring is adapted to the connecting groove, and the explosion-proof membrane is placed between the clamping ring and the bottom of the connecting groove. The clamping ring further compresses the explosion-proof membrane, pressing the edge of the explosion-proof membrane into the connecting groove, preventing the explosion-proof membrane from shifting and causing the pressure relief hole to fail to seal, thus allowing external liquids to enter the lithium battery. This further improves the installation stability of the explosion-proof membrane.

[0017] Preferably, the dustproof plate has guide holes, and the auxiliary support includes a housing and a support rod. The cover plate has a screw hole, one end of which is threaded into the screw hole, and the other end of which abuts against the housing. The support rod is inserted into the guide hole. The dustproof plate is inserted into the support rod through the guide hole, allowing it to move along the guide rod. The support rod is screwed into the screw hole and mounted on the cover plate, facilitating assembly and further protecting the pressure relief hole from dust. This improves the structural assembly stability and protects the lithium battery.

[0018] Preferably, the support rod is fitted with an elastic mechanism, one end of which abuts against the outer shell, and the other end of which is connected to the dustproof plate. By fitting the elastic mechanism onto the support rod, the dustproof plate allows the explosion-proof membrane to be lifted and moved along the support rod in a depressurized state, while simultaneously maintaining protection and dustproof shielding at the pressure relief hole in a depressurized state. This improves the stability of the protection of the pressure relief hole.

[0019] Preferably, the outer casing is provided with several ventilation holes, which are evenly distributed on the surface of the casing. By creating these ventilation holes, the heat exchange rate between the pressure relief vents and the outside environment is improved. This achieves the effect of further ensuring high heat dissipation for daily use while providing high-strength protection for the explosion-proof film, thereby enhancing protection and safety in use.

[0020] Preferably, the cover plate has a second screw hole, and the outer shell is threadedly connected to the second screw hole. The outer shell is connected to the cover plate by screwing into or out of the second screw hole. This facilitates assembly and inspection of the explosion-proof membrane's condition.

[0021] Preferably, the cover plate has three screw holes, one end of the wire-fixing ring is threaded into the three screw holes, and the wire-fixing ring is rotatably connected to a connecting rod. The protective cover has a relief groove, and the connecting rod is movably connected to the relief groove. A fixing nut is threaded onto the connecting rod. The wire-fixing ring is connected to the cover plate by screwing into the three screw holes. The wire-fixing ring is inserted into the relief groove of the protective cover via the connecting rod to connect to the protective cover. The fixing nut is then screwed into the connecting rod to tighten the protective cover and improve the connection strength. This achieves the effect of facilitating quick assembly and disassembly while providing stable protection for the pole.

[0022] The beneficial effects of this utility model are: it provides safety protection for the connection of lithium battery terminals and pressure relief operations through the cover plate structure; it improves the safety of use; it improves the stability of power connection and prevents circuit disconnection; the structure facilitates assembly and maintenance and extends service life; it improves the stability of structural assembly; and it facilitates the assembly and inspection of the explosion-proof film status. Attached Figure Description

[0023] Figure 1 This is a perspective view of the present invention (in an exploded state);

[0024] Figure 2 This is a cross-sectional view of the present invention;

[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This is a diagram showing the usage status of the explosion-proof film;

[0027] Figure 5 This is a diagram of the connecting rod connection structure.

[0028] In the diagram: 1. Cover plate, 2. Pressure relief hole, 3. Terminal hole, 4. Explosion-proof membrane, 5. Limiting seat, 6. Dustproof plate, 7. Dustproof net, 8. Wire fixing ring, 9. Wire fixing groove one, 10. Wire fixing groove two, 11. Limiting groove, 12. Pressing ring, 13. Connecting groove, 14. Guide hole, 15. Outer shell, 16. Support rod, 17. Screw hole one, 18. Elastic mechanism, 19. Heat dissipation hole, 20. Screw hole two, 21. Screw hole three, 22. Connecting rod, 23. Protective cover, 24. Relief groove, 25. Fixing nut, 26. Connecting hole, 27. Movable groove, 28. Rotating rod, 29. Negative terminal, 30. Positive terminal, 31. Electrode plate, 32. Nut. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of components illustrated in these embodiments do not limit the scope of this application. For ease of illustration, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, an element described as being “below” other elements or features would be positioned “up” other elements or features. Thus, the exemplary term “down” can include both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein can be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale. Techniques, processes, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, processes, and equipment should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be discussed further in subsequent figures.

[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0033] Example 1:

[0034] like Figure 1-3As shown, a lithium battery protective cover structure includes a cover body 1, which has a pressure relief hole 2 and electrode post holes 3 on both sides of the pressure relief hole 2; an explosion-proof membrane 4, which is detachably connected to a limiting seat 5, and the explosion-proof membrane 4 is detachably connected to the limiting seat 5; a dustproof plate 6, which is placed above the explosion-proof membrane 4 and movably connected to the pressure relief hole 2, and the dustproof plate 6 is connected to a dustproof net 7; an auxiliary bracket, which is detachably connected to the cover body 1, and the dustproof plate 6 is movably connected to the auxiliary bracket; a wire fixing ring 8, which is detachably connected to the cover body 1, and the electrode post holes 3 are placed inside the wire fixing ring 8, and the wire fixing ring 8 has several wire fixing grooves 9; and a protective cover 23, which is detachably connected to the wire fixing ring 8, and the protective cover 23 has a second wire fixing groove 10, the position and size of which are adapted to the first wire fixing groove 9.

[0035] like Figure 3 As shown, the inner wall of the pressure relief hole 2 is provided with a limiting groove 11, the side wall of the limiting groove 11 is provided with an internal thread, the outer side of the limiting seat 5 is provided with an external thread, the limiting seat 5 is threadedly connected to the limiting groove 11, and the explosion-proof membrane 4 is placed between the limiting seat 5 and the bottom of the limiting groove 11.

[0036] like Figure 2 , 3 As shown, a clamping ring 12 is connected to one side of the limiting seat 5, and a connecting groove 13 is provided on the other side of the limiting seat 5. The clamping ring 12 is adapted to the connecting groove 13, and the explosion-proof film 4 is placed between the bottom of the clamping ring 12 and the connecting groove 13.

[0037] like Figure 4 As shown, the dustproof plate 6 is provided with a guide hole 14, the auxiliary support includes a shell 15 and a support rod 16, the cover plate 1 is provided with a screw hole 17, one end of the support rod 16 is threaded to the screw hole 17, the other end of the support rod 16 abuts against the shell 15, and the support rod 16 is inserted into the guide hole 14.

[0038] like Figure 2 , 4 As shown, the support rod 16 is sleeved with an elastic mechanism 18. One end of the elastic mechanism 18 abuts against the outer shell 15, and the other end of the elastic mechanism 18 is connected to the dustproof plate 6.

[0039] like Figure 1 , 4 As shown, the outer casing 15 is provided with heat dissipation holes 19, and there are several heat dissipation holes 19 evenly arranged on the surface of the outer casing 15.

[0040] like Figure 4 As shown, the cover plate 1 is provided with screw hole 20, and the outer shell 15 is threadedly connected to screw hole 20.

[0041] like Figure 1 , 2As shown in Figure 5, the cover plate 1 is provided with screw hole 3 21, one end of the fixing ring 8 is threaded to screw hole 3 21, the fixing ring 8 is rotatably connected to the connecting rod 22, the protective cover 23 is provided with relief groove 24, the connecting rod 22 is movably connected to the relief groove 24, and the connecting rod 22 is threaded to the fixing nut 25.

[0042] like Figure 1-5 As shown: The wire ring 8 is provided with a connecting hole 26, which facilitates the extension and connection of the conductor when the lithium battery is connected in series.

[0043] A negative electrode post 29 is installed in the electrode post hole 3 on one side, and a positive electrode post 30 is connected to the other side. Electrode plates 31 are connected to the negative electrode post 29 and the positive electrode post 30 in preparation for connection with the battery cell. When the power supply is connected, the electrical connection is achieved by connecting the guide plate (not shown in the figure) on the conductive wire (not shown in the figure) to the negative electrode post 29 or the positive electrode post 30. Both the negative electrode post 29 and the positive electrode post 30 are threaded with nuts 32 to fix the conductive plates.

[0044] The elastic mechanism 18 is a spring structure. The dustproof plate 6 has a mounting hole at its center. The dustproof net 7 is glued and fixed to the wall of the mounting hole.

[0045] The end face of the fixed ring 8 is provided with a movable groove 27, and a rotating rod 28 is connected to the movable groove 27. The connecting post 22 is inserted into the rotating rod 28, so that the connecting post 22 can rotate stably along the rotating rod 28 as the fulcrum.

[0046] In use: Connect and fix the cover plate 1 to the protective shell of the lithium battery (not shown in the figure). The electrode plate 31 contacts the battery cell and is energized. When installing the battery, insert the conductive plates of the conductive wires of the negative terminal 29 and the positive terminal 30 into the terminals and fix them with nuts 32. Screw the wire fixing ring 8 into the screw hole 21, place the conductive wire on the wire fixing groove 9, and connect the protective cover 23 to the wire fixing ring 8 so that the wire fixing groove 10 and the wire fixing groove 9 are closed and press the conductive wire. Rotate the connecting rod 22 to insert the connecting rod 22 into the relief groove 24, tighten the fixing nut 25 and press it down to tighten the protective cover. The cover 23 and the fixing ring 8 complete the protective installation of the cover plate structure for the pole; the explosion-proof membrane 4 is placed into the pressure relief hole 2 and the limiting seat 5 is screwed in to cooperate with the clamping ring 12 to press the explosion-proof membrane 4 to prevent movement; each support rod 16 is lowered into the screw hole 17; the dustproof plate 6 with dustproof net 7 is inserted into the support rod 16 through the guide hole 14; the elastic mechanism 18 is fitted onto the support rod 16; the outer shell 15 is closed and screwed into the screw hole 20; the inner top surface of the outer shell 15 abuts against the elastic mechanism 18 and the support rod 16, thus completing the protective installation of the cover plate structure for the pressure relief hole and preparing it for power supply.

[0047] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lithium battery protective cover structure, characterized in that, include The cover plate (1) is provided with a pressure relief hole (2) and pole holes (3) are provided on both sides of the pressure relief hole (2); The explosion-proof membrane (4) is connected to the pressure relief hole (2) by a detachable limit seat (5), and the explosion-proof membrane (4) is connected to the limit seat (5) by a detachable connection. Dustproof plate (6), the dustproof plate (6) is placed above the explosion-proof membrane (4) and is movably connected to the pressure relief hole (2), and the dustproof plate (6) is connected to a dustproof net (7); An auxiliary support is detachably connected to the cover plate (1), and the dustproof plate (6) is movably connected to the auxiliary support; The wire fixing ring (8) is detachably connected to the cover plate body (1), the pole hole (3) is placed inside the wire fixing ring (8), and the wire fixing ring (8) is provided with several wire fixing grooves (9). The protective cover (23) is detachably connected to the wire fixing ring (8). The protective cover (23) is provided with a second wire fixing groove (10), and the position and size of the second wire fixing groove (10) are adapted to the first wire fixing groove (9).

2. The lithium battery protective cover structure according to claim 1, characterized in that, The inner wall of the pressure relief hole (2) is provided with a limiting groove (11), the side wall of the limiting groove (11) is provided with an internal thread, the outer side of the limiting seat (5) is provided with an external thread, the limiting seat (5) is threadedly connected to the limiting groove (11), and the explosion-proof film (4) is placed between the limiting seat (5) and the bottom of the limiting groove (11).

3. The lithium battery protective cover structure according to claim 2, characterized in that, The limiting seat (5) is connected to a clamping ring (12) on one side, and a connecting groove (13) is provided on the other side of the limiting seat (5). The clamping ring (12) is adapted to the connecting groove (13), and the explosion-proof film (4) is placed between the bottom of the clamping ring (12) and the connecting groove (13).

4. The lithium battery protective cover structure according to claim 1, characterized in that, The dustproof plate (6) is provided with a guide hole (14). The auxiliary support includes a shell (15) and a support rod (16). The cover plate (1) is provided with a screw hole (17). One end of the support rod (16) is threaded to the screw hole (17). The other end of the support rod (16) abuts against the shell (15). The support rod (16) is inserted into the guide hole (14).

5. The lithium battery protective cover structure according to claim 4, characterized in that, The support rod (16) is fitted with an elastic mechanism (18), one end of which abuts against the outer shell (15), and the other end of which is connected to the dustproof plate (6).

6. A lithium battery protective cover structure according to claim 4 or 5, characterized in that, The outer shell (15) is provided with heat dissipation holes (19), and the heat dissipation holes (19) are provided in a plurality of them and are evenly arranged on the surface of the outer shell (15).

7. The lithium battery protective cover structure according to claim 6, characterized in that, The cover plate (1) is provided with screw hole two (20), and the outer shell (15) is threadedly connected to screw hole two (20).

8. The lithium battery protective cover structure according to claim 1, characterized in that, The cover plate (1) is provided with screw hole three (21), one end of the fixing ring (8) is threaded to screw hole three (21), the fixing ring (8) is rotatably connected to connecting rod (22), the protective cover (23) is provided with relief groove (24), the connecting rod (22) is movably connected to relief groove (24), and the connecting rod (22) is threaded to fixing nut (25).

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