Lithium battery cap

Abstract

The lithium battery cap comprises a steel ring, a shell, a connecting plate, an elastic buffer film and a conductive rod, the shell is sleeved on the steel ring, a gap exists between the inner wall of the shell and the outer wall of the steel ring, the connecting plate is fixed in the steel ring in a sealing mode and is close to the lower end opening of the steel ring, and flow guide holes are formed in the connecting plate around the axis of the steel ring in an annular array mode. The conductive rod is vertically fixed to the center of the upper surface of the connecting plate, the elastic buffer film is connected into the steel ring in a sealed mode and located above the connecting plate, the conductive rod penetrates through the elastic buffer film, and a buffer cavity is formed in the steel ring and located between the connecting plate and the elastic buffer film. According to the utility model, the pressure can be effectively buffered when smaller pressure exists in the lithium battery, and when the pressure in the lithium battery is too large, the pressure can be quickly released, and the pressure buffering and the pressure releasing are combined, so that the stability and the safety of the lithium battery during use are effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery accessories, in particular to a lithium battery cap. Background Technique

[0002] There are many raw materials and parts inside the existing lithium batteries. Among them, placing them on the lithium battery through the cap plays a protective role, also known as the lithium battery protective cover. However, some of the existing caps are composed of simple aluminum sheets inside, and the inside of the lithium battery is also relatively closed, resulting in poor air permeability and heat dissipation between the lithium battery and the cap, which is easy to cause thermal expansion. When the temperature is too high, the current output is unstable, which is likely to cause the lithium battery to explode.

[0003] In the prior art, an explosion-proof sheet is added to the cap assembly of the lithium battery to avoid the explosion of the lithium battery. However, since the explosion-proof sheet can only cause the explosion-proof sheet to rupture after the internal pressure of the lithium battery increases to a certain extent, when the internal pressure of the lithium battery is small, the outer shell of the lithium battery will expand and deform, and the deformed lithium battery is not convenient to be installed in the battery box for use. Content of the Utility Model

[0004] The purpose of the utility model is to provide a lithium battery cap with good pressure relief effect, which effectively solves the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions.

[0006] A lithium battery cap includes a steel ring, a shell, a connecting plate, an elastic buffer film and a conductive rod. The shell is sleeved on the steel ring, and there is a gap between the inner wall of the shell and the outer wall of the steel ring. The connecting plate is hermetically fixed in the steel ring and near the lower port of the steel ring. The connecting plate is arranged in a circular array around the axis of the steel ring with flow guiding holes. The conductive rod is vertically fixed at the center of the upper surface of the connecting plate. The elastic buffer film is hermetically connected in the steel ring and above the connecting plate. The conductive rod penetrates through the elastic buffer film, and a buffer cavity is formed between the connecting plate and the elastic buffer film in the steel ring.

[0007] Thus, when the internal pressure of the lithium battery increases due to heating, the gas flows into the buffer cavity formed between the connecting plate and the elastic buffer film in the steel ring through the flow guiding holes, pushing the elastic buffer film to bulge and deform towards the end of the shell, thereby increasing the space of the buffer cavity, realizing pressure buffering, effectively slowing down the pressure generated inside the lithium battery due to temperature rise, and adapting to the change of small pressure inside the lithium battery.

[0008] Furthermore, the housing is slidably connected to the steel ring. A plurality of vertically extending mounting holes are annularly arranged around the axis on the top surface of the steel ring. A vertically extending spring is fixed to the inner bottom wall of each mounting hole, and the top end of each spring is fixedly connected to the inner top wall of the housing. A plurality of through exhaust holes are evenly distributed around the axis on the side wall of the steel ring. The exhaust holes are arranged between the elastic buffer membrane and the connecting plate, and the housing covers each exhaust hole when there is no pressure relief.

[0009] Furthermore, a convex ring is fixed on the outer wall of the steel ring, and a sealing ring is fixed on the surface of the convex ring. The sealing ring is a rubber ring, and the lower end surface of the housing tightly abuts against the sealing ring when there is no pressure relief.

[0010] Furthermore, a sealing ring is provided at the center of the elastic buffer membrane. The sealing ring is slidably sleeved on the conductive rod. The sealing ring is made of rubber, so that the central part of the elastic buffer membrane is slidably and sealingly connected to the conductive rod.

[0011] Furthermore, a convex platform is provided at the top of the housing, and a conductive head is fixed on the convex platform. The conductive rod penetrates through the housing and the convex platform and is conductively connected to the conductive head.

[0012] Furthermore, at least six exhaust holes and diversion holes are provided.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows.

[0014] 1. When the internal pressure of the lithium battery increases due to heat generation, the gas flows into the buffer cavity formed between the connecting plate and the elastic buffer membrane in the steel ring through the diversion hole, pushing the elastic buffer membrane to bulge and deform towards the end side of the housing, thereby increasing the space of the buffer cavity, realizing pressure buffering, effectively slowing down the pressure generated inside the lithium battery due to temperature rise, and adapting to the small pressure change inside the lithium battery.

[0015] 2. When the internal pressure of the lithium battery is too high and cannot be effectively relieved through the deformation of the elastic buffer membrane, the gas flows into the gap between the inner wall of the housing and the outer wall of the steel ring through the exhaust hole, and pushes the housing to move upward. At this time, the spring is stretched, and the lower end surface of the housing is separated from the sealing ring, canceling the seal, realizing internal and external communication, and quickly discharging the internal gas to the outside. On the one hand, it can effectively dissipate heat, and on the other hand, it can realize rapid pressure relief, avoiding explosion and rupture of the lithium battery due to rapid increase of internal pressure.

[0016] 3. When there is a small pressure inside the lithium battery, the present utility model can effectively buffer the pressure. When the internal pressure of the lithium battery is too high, it can perform rapid pressure relief. The combination of pressure buffering and pressure relief effectively ensures the stability and safety of the lithium battery during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is one of the three-dimensional schematic diagrams of the overall structure of the present utility model;

[0018] Figure 2 This is the second three-dimensional schematic diagram of the overall structure of the present utility model;

[0019] Figure 3 This is the cross-sectional structure schematic diagram of the present utility model;

[0020] Figure 4 It is Figure 3 The enlarged schematic diagram of the structure at A in

[0021] In the figure: 1. Steel ring; 11. Exhaust hole; 12. Mounting hole; 13. Spring; 2. Housing; 21. Boss; 22. Conductive head; 3. Connecting plate; 31. Flow guiding hole; 4. Elastic buffer film; 41. Sealing ring; 5. Conductive rod; 6. Convex ring; 61. Sealing ring. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0023] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connection", "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct communication or an indirect communication through an intermediate medium. Among them, "fixing" means that they are connected to each other and the relative positional relationship after connection remains unchanged. The orientation terms mentioned in the embodiments of the present utility model, such as "inside", "outside", "top", "bottom", etc., are only references to the direction of the accompanying drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of the present utility model, 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 thus cannot be understood as a limitation to the embodiments of the present utility model.

[0024] In the embodiments of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0025] Please refer to Figures 1-4, a lithium battery cap provided by the present utility model includes a steel ring 1, a housing 2, a connecting plate 3, an elastic buffer film 4 and a conductive rod 5. The housing 2 is sleeved on the steel ring 1, and there is a gap between the inner wall of the housing 2 and the outer wall of the steel ring 1. The connecting plate 3 is hermetically fixed inside the steel ring 1 and near the lower port of the steel ring 1. Flow guiding holes 31 are arranged in a circular array around the axis of the steel ring 1 on the connecting plate 3. The conductive rod 5 is vertically fixed at the center of the upper surface of the connecting plate 3. The elastic buffer film 4 is hermetically connected inside the steel ring 1 and above the connecting plate 3. The conductive rod 5 penetrates through the elastic buffer film 4. A buffer cavity is formed between the connecting plate 3 and the elastic buffer film 4 inside the steel ring 1.

[0026] The steel ring 1 is fixedly encapsulated with the cylindrical shell of the lithium battery. When the lithium battery heats up and the internal pressure increases, the gas flows into the buffer cavity formed between the connecting plate 3 and the elastic buffer film 4 inside the steel ring 1 through the flow guiding holes 31, pushing and causing the elastic buffer film 4 to bulge and deform towards the end side of the housing 2, thereby increasing the space of the buffer cavity, realizing pressure buffering, effectively slowing down the pressure generated inside the lithium battery due to temperature rise, so as to adapt to the change of the small pressure inside the lithium battery.

[0027] Specifically, a convex ring 6 is fixed on the outer wall of the steel ring 1, and a sealing ring 61 is fixed on the surface of the convex ring 6. The sealing ring 61 is a rubber ring. When there is no pressure relief, the lower end surface of the housing 2 tightly abuts against the sealing ring 61 to achieve sealing.

[0028] In addition, the housing 2 is slidably connected to the steel ring 1. A plurality of vertically extending mounting holes 12 are arranged in a circular array around the axis on the top surface of the steel ring 1. The bottom walls of the mounting holes 12 are all fixed with vertically extending springs 13. The top ends of the springs 13 are all fixedly connected to the inner top wall of the housing 2. A plurality of through exhaust holes 11 are evenly distributed around the axis on the side wall of the steel ring 1. The exhaust holes 11 are arranged between the elastic buffer film 4 and the connecting plate 3. When there is no pressure relief, the housing 2 covers the exhaust holes 11.

[0029] When the internal pressure of the lithium battery is too high and cannot be effectively relieved through the deformation of the elastic buffer film 4, the gas flows into the gap between the inner wall of the housing 2 and the outer wall of the steel ring 1 through the exhaust holes 11, and pushes the housing 2 to move upward. At this time, the spring 13 is stretched, and the lower end surface of the housing 2 is separated from the sealing ring 61, canceling the seal, realizing internal and external communication, and quickly discharging the internal gas to the outside. On the one hand, it can effectively dissipate heat, and on the other hand, it can realize rapid pressure relief, avoiding explosion and rupture of the lithium battery due to rapid increase of internal pressure.

[0030] When the pressure relief is completed until the internal pressure of the lithium battery returns to the normal value, the housing 2 is driven to slide back under the elastic reset action of the spring 13, and the bottom end of the housing 2 can be restored to abut against the sealing ring 61 for sealing.

[0031] Furthermore, when there is a relatively small pressure inside the lithium battery, this lithium battery cap can effectively buffer the pressure. When the pressure inside the lithium battery is too high, it can quickly release the pressure. The combination of pressure buffering and pressure relief effectively ensures the stability and safety during the use of the lithium battery.

[0032] In addition, the steel ring 1 and the housing 2 are not fixedly connected. When recycling and disassembling the lithium battery in the later stage, the housing 2 is pulled by a tensile machine, so that the spring 13 falls off from the inner bottom wall of the mounting hole 12, and the rapid disassembly of the cap can be realized, thus facilitating the treatment.

[0033] Specifically, a sealing ring 41 is provided at the center of the elastic buffer film 4. The sealing ring 41 is slidably sleeved on the conductive rod 5. The sealing ring 41 is made of rubber, so that the center of the elastic buffer film 4 is slidably and sealingly connected to the conductive rod 5. When the elastic buffer film 4 deforms, the sealing ring 41 can slide along the conductive rod 5.

[0034] Specifically, a boss 21 is provided at the top of the housing 2, and a conductive head 22 is fixed on the boss 21. The conductive rod 5 passes through the housing 2 and the boss 21 and is electrically connected to the conductive head 22. After this end cap is fixedly encapsulated on the cylindrical shell of the lithium battery, the connecting plate 3 is connected to the battery cell, and the conductive path is realized through the connecting plate 3, the conductive rod 5 and the conductive head 22, which is convenient for power supply.

[0035] Specifically, there are at least six exhaust holes 11 and diversion holes 31.

[0036] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A lithium battery cap, characterized in that: It comprises a steel ring (1), a shell (2), a connecting plate (3), an elastic buffer membrane (4) and a conductive rod (5); The shell (2) is sleeved on the steel ring (1), a gap exists between the inner wall of the shell (2) and the outer wall of the steel ring (1), and the connecting plate (3) is sealed and fixed inside the steel ring (1) and close to the lower end of the steel ring (1); The connecting plate (3) is provided with flow guide holes (31) arranged in a ring array around the axis of the steel ring (1), and the conductive rod (5) is vertically fixed at the center of the upper surface of the connecting plate (3); The elastic buffer membrane (4) is sealed and connected inside the steel ring (1) and is located above the connecting plate (3), and the conductive rod (5) passes through the elastic buffer membrane (4); A buffer cavity is formed in the steel ring (1) between the connecting plate (3) and the elastic buffer membrane (4).

2. A lithium battery cap according to claim 1, characterized in that: The housing (2) is slidably connected to the steel ring (1), and the top surface of the steel ring (1) has a plurality of vertically extending mounting holes (12) arranged in a circular array around its axis; A vertically extending spring (13) is fixed to the inner bottom wall of each mounting hole (12), and the top end of each spring (13) is fixedly connected to the inner top wall of the housing (2); A plurality of through-going exhaust holes (11) are evenly distributed on the side wall of the steel ring (1) around its axis, and the exhaust holes (11) are arranged between the elastic buffer membrane (4) and the connecting plate (3); When the pressure is not released, the shell (2) covers each of the exhaust holes (11).

3. A lithium battery cap according to claim 1, characterized in that: A convex ring (6) is fixed on the outer wall of the steel ring (1), a sealing ring (61) is fixed on the surface of the convex ring (6), and the sealing ring (61) is a rubber ring; When the pressure is not released, the lower end surface of the housing (2) is in tight contact with the sealing ring (61).

4. A lithium battery cap according to claim 1, characterized in that: The elastic buffer membrane (4) has a sealing ring (41) at the center, and the sealing ring (41) is slidably mounted on the conductive rod (5); The sealing ring (41) is a rubber product, so that the central portion of the elastic buffer membrane (4) is connected to the conductive rod (5) in a sliding and sealing manner.

5. The lithium battery cap according to claim 1, characterized in that: The top of the housing (2) is provided with a boss (21), and a conductive head (22) is fixed on the boss (21); The conductive rod (5) passes through the housing (2) and the boss (21) and is conductively connected to the conductive head (22).

6. A lithium battery cap according to claim 2, characterized in that: The exhaust holes (11) and the guide holes (31) are each provided with at least six.

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