Combined cap and lithium manganese iron phosphate cylindrical lithium ion battery

Abstract

The utility model relates to the technical field of lithium ion batteries, in particular to a combined cover cap and a lithium manganese iron phosphate cylindrical lithium ion battery, which comprises a main body, the main body comprises a battery body, the top of the battery body is fixedly connected with a cover cap body, and the cover cap body comprises a cover body. A partition plate is fixedly connected to the bottom between the two sides of an inner cavity of the cover body. The exhaust pipe is sealed through the matching of the sealing block and the sealing ring, meanwhile, the sealing effect of the cap body is improved through the valve plate in the cap body, and when the battery body is exhausted, gas extrudes the sealing block through the exhaust pipe, so that the sealing block extrudes the sealing ring and moves to the top of the sealing ring; after the sealing ring is deformed, a gap is reserved between the internal opening and the ejector rod, so that gas can be exhausted through the exhaust pipe, and meanwhile, the sealing block moves upwards to burst the valve plate, so that gas in the battery body can be exhausted through the exhaust hole formed in the surface of the top cover, and the safety of the battery body is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, specifically to a combined cap and a cylindrical lithium-ion battery of lithium manganese iron phosphate. Background Technology

[0002] Lithium manganese iron phosphate cylindrical lithium-ion batteries are a type of lithium-ion battery that uses lithium manganese iron phosphate as the positive electrode material and has a cylindrical casing. These batteries typically have a five-digit model name, representing the battery's diameter and height. They are mainly made of steel and feature high capacity, stable output voltage, good electrochemical performance, and safety.

[0003] To address the aforementioned problems, existing technologies offer a solution. For example, patent publication number CN109103360 provides a lithium battery cap. This solution includes a cap body, a sealing ring, a top cover, an elastic long piece, an elastic short piece, and an aluminum sheet. The cap body is a cylinder extending through both the top and bottom surfaces. The cap body is tightly fitted onto the sealing ring. The upper end of the sealing ring is fitted onto the top cover, and the middle end of the sealing ring is fitted onto the elastic long piece and the elastic short piece. The elastic short piece is located below the elastic long piece, and the lower end of the sealing ring is fitted onto the aluminum sheet. This invention enhances the tightness of the entire device by compressing the elastic short piece onto the elastic long piece. Simultaneously, the elastic short piece compresses the protruding portion at the middle of the sealing ring to both sides, enhancing the sealing effect of the invention. Furthermore, the elastic short piece protects the aluminum sheet, preventing it from deforming and falling off due to prolonged compression.

[0004] Although the patent enhances the sealing effect of the invention by squeezing the protruding part in the middle of the sealing ring to both sides with elastic short pieces, the explosion-proof coefficient of the battery cap is low. When the battery malfunctions and begins to release gas, the battery cap cannot release the gas in time, which increases its danger and makes it unsuitable for use.

[0005] To address this, a combined cap and a cylindrical lithium-ion battery made of lithium manganese iron phosphate are proposed. Utility Model Content

[0006] The purpose of this invention is to provide a combined cap and a cylindrical lithium-ion battery of lithium manganese iron phosphate, which solves the problem that the existing lithium battery cap has a low explosion-proof coefficient and cannot release gas when gas expands inside the battery, resulting in a high risk.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A combined cap and a cylindrical lithium-ion battery of lithium manganese iron phosphate, comprising a main body, the main body including a battery body, a cap body fixedly connected to the top of the battery body, the cap body including a cover, a partition fixedly connected to the bottom between the two sides of the inner cavity of the cover, an exhaust pipe connected to the top of the partition, a sealing ring and a movable plate fixedly connected to the top and bottom of the two sides of the inner cavity of the exhaust pipe respectively, a top rod fixedly connected to the top of the movable plate, a sealing block fixedly connected to the top of the top rod, a top cover, a PTC ring and a valve plate fixedly connected from top to bottom between the two sides of the inner cavity of the cover, and a buffer assembly provided on the surface of the battery body.

[0009] Preferably, the buffer assembly includes a protective shell, a contact is fixedly connected to the bottom of the inner cavity of the protective shell, the bottom of the contact extends to the outside of the protective shell, an elastic pressure plate is provided at the top of the contact, and a sliding ring is slidably connected to the top and bottom of the surface of the battery body, with both sides of the sliding ring being fixedly connected to the inner wall of the protective shell.

[0010] Preferably, the contact and the elastic pressure plate are fixedly connected by a conductive wire, and the surface of the protective shell is provided with heat dissipation holes.

[0011] Preferably, the surface of the top cover is provided with six vent holes, which are evenly distributed on the surface of the top cover.

[0012] Preferably, guide rails are fixedly connected to both sides of the inner cavity of the exhaust pipe, and guide grooves that cooperate with the guide rails are opened on both sides of the movable plate.

[0013] Preferably, a pointed cone is fixedly connected to the top of the sealing block, and the sealing block is conical in shape.

[0014] Preferably, the inner cavity of the sealing ring is funnel-shaped, and the top of the valve plate has an exhaust groove.

[0015] Preferably, the top of the movable plate has three air supply openings.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model uses a sealing block and a sealing ring to seal the exhaust pipe. At the same time, the valve plate inside the cover body increases the sealing effect of the cover body. When the battery body is venting, the gas squeezes the sealing block through the exhaust pipe, causing the sealing block to squeeze the sealing ring and move to the top of the sealing ring. After the sealing ring is deformed, a gap is left between its internal opening and the top rod, allowing the gas to be discharged through the exhaust pipe. At the same time, the sealing block moves upward and breaks the valve plate, allowing the gas inside the battery body to be discharged through the exhaust hole opened on the surface of the top cover, thus improving the safety of the battery body.

[0018] 2. This utility model can protect the battery body through a buffer component. When the battery body is hit or accidentally dropped, it can absorb the impact force to prevent the impact force from affecting the battery body and improve its safety. The sliding ring prevents the battery body from shaking inside the protective shell, and the elastic pressure plate absorbs the impact force to avoid damage to the battery body, further improving the safety of the battery body. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the protective shell of this utility model;

[0021] Figure 3 This is an exploded view of the buffer component of this utility model;

[0022] Figure 4 This is a cross-sectional view of the cap body of this utility model;

[0023] Figure 5 This is a cross-sectional view of the exhaust pipe of this utility model.

[0024] In the diagram: 1. Main body; 101. Battery body; 102. Cap body; 1021. Cover; 1022. Separator; 1023. Exhaust pipe; 1024. Sealing ring; 1025. Movable plate; 1026. Top rod; 1027. Sealing block; 1028. Top cover; 1029. PTC ring; 103. Valve plate; 104. Buffer assembly; 1041. Protective shell; 1042. Contact; 1043. Elastic pressure plate; 1044. Sliding ring; 1045. Conductive wire; 1046. Heat dissipation hole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. However, the embodiments described below are only some embodiments of the present utility model, and not all of them. If other embodiments are obtained by those skilled in the art without creative effort, they shall fall within the protection scope of the present utility model.

[0026] Reference Figure 1-5A combined cap and a cylindrical lithium-ion battery of lithium manganese iron phosphate, comprising a main body 1, the main body 1 including a battery body 101, a cap body 102 fixedly connected to the top of the battery body 101, the cap body 102 including a cover 1021, a partition 1022 fixedly connected to the bottom between the two sides of the inner cavity of the cover 1021, an exhaust pipe 1023 connected to the top of the partition 1022, a sealing ring 1024 and a movable plate 1025 fixedly connected to the top and bottom of the two sides of the inner cavity of the exhaust pipe 1023 respectively, a top rod 1026 fixedly connected to the top of the movable plate 1025, a sealing block 1027 fixedly connected to the top of the top rod 1026, and a top cover 1028 and a PT fixedly connected from top to bottom between the two sides of the inner cavity of the cover 1021. The C-ring 1029 and valve plate 103, the surface of the battery body 101 is provided with a buffer assembly 104, the partition plate 1022 can fix the bottom of the cover 1021, the exhaust pipe 1023 can discharge the gas inside the battery body 101, the sealing ring 1024 and the sealing block 1027 can seal the exhaust pipe 1023, the movable plate 1025 can facilitate the installation of the push rod 1026 and the sealing block 1027, the PTC ring 1029 has the characteristic that the resistivity increases with the temperature, and can prevent the battery body 101 from continuing to discharge when the temperature is abnormal, the valve plate 103 can seal the inside of the cover 1021, and when the exhaust pipe 1023 exhausts, the valve plate 103 can be broken by the pointed cone so that the gas can be discharged quickly.

[0027] As one embodiment of this utility model, refer to Figure 1 , Figure 2 and Figure 3 The buffer assembly 104 includes a protective shell 1041. A contact 1042 is fixedly connected to the bottom of the inner cavity of the protective shell 1041. The bottom of the contact 1042 extends to the outside of the protective shell 1041. An elastic pressure plate 1043 is provided on the top of the contact 1042. Sliding rings 1044 are slidably connected to the top and bottom of the surface of the battery body 101. Both sides of the sliding rings 1044 are fixedly connected to the inner wall of the protective shell 1041. A conductive wire connects the contact 1042 and the elastic pressure plate 1043. The protective shell 1041 is fixedly connected to the battery body 1045. The surface of the protective shell 1041 is provided with heat dissipation holes 1046. The contact 1042 can cooperate with the conductive wire 1045 and the elastic pressure plate 1043 to conduct power from the battery body 101. The sliding ring 1044 can prevent the battery body 101 from shaking inside the protective shell 1041, thus avoiding the battery body 101 from constantly hitting the inner wall of the protective shell 1041. The elastic pressure plate 1043 can absorb the impact force and prevent the battery body 101 from being affected by the impact force.

[0028] As one embodiment of this utility model, refer to Figure 1 , Figure 4 and Figure 5The top cover 1028 has six vent holes evenly distributed on its surface. Guide rails are fixedly connected to both sides of the inner cavity of the vent pipe 1023. Guide grooves that mate with the guide rails are formed on both sides of the movable plate 1025. A pointed cone is fixedly connected to the top of the sealing block 1027, which is conical in shape. The inner cavity of the sealing ring 1024 is funnel-shaped. A vent groove is formed on the top of the valve plate 103. The movable plate 1025... The top has three air supply openings. The exhaust holes can quickly discharge the gas inside the cover 1021. The guide rail and guide groove can limit the movable plate 1025, allowing it to move up and down smoothly. The pointed cone can cooperate with the sealing block 1027 to puncture the valve plate 103, allowing the gas to be discharged quickly. The exhaust groove can facilitate the pointed cone to quickly puncture the valve plate 103. The air supply openings can facilitate the gas to push the sealing block 1027 through the movable plate 1025.

[0029] Working principle: When gas is generated inside the battery body 101 due to high temperature and needs to be released, the gas pushes the sealing block 1027 through the exhaust pipe 1023, causing the sealing block 1027 to continuously compress the sealing ring 1024. When the gas pressure inside the battery body 101 becomes too high, the sealing block 1027 is directly pushed out of the sealing ring 1024. At this time, the gas is released through the gap between the push rod 1026 and the sealing ring 1024. After the sealing block 1027 moves out of the exhaust pipe 1023, it punctures the valve plate 103 through the pointed cone at its top, allowing the gas to be released quickly. To prevent excessive gas pressure inside the battery body 101 and improve its safety, the protective shell 1041 protects the battery body 101 when it is impacted or accidentally dropped. At the same time, the elastic pressure plate 1043 can deform and absorb the impact force to prevent the impact force from affecting the battery body 101. The sliding ring 1044 prevents the battery body 101 from shaking inside the protective shell 1041, thus preventing damage to the battery body 101 and further improving its safety.

[0030] Although the embodiments of this utility model have been described in detail with reference to the accompanying drawings, those skilled in the art can make changes, modifications, substitutions and variations to these embodiments without departing from the principles and spirit of this utility model. The appended claims and their equivalents define the scope of this utility model.

Claims

1. A combined cap and a cylindrical lithium-ion battery of lithium manganese iron phosphate, comprising a main body (1), characterized in that: The main body (1) includes a battery body (101), and a cap body (102) is fixedly connected to the top of the battery body (101). The cap body (102) includes a cover (1021), and a partition (1022) is fixedly connected to the bottom between the two sides of the inner cavity of the cover (1021). The top of the partition (1022) is connected to an exhaust pipe (1023), and the top and bottom of the inner cavity of the exhaust pipe (1023) are respectively fixedly connected to... A sealing ring (1024) and a movable plate (1025) are provided. A top rod (1026) is fixedly connected to the top of the movable plate (1025). A sealing block (1027) is fixedly connected to the top of the top rod (1026). A top cover (1028), a PTC ring (1029), and a valve plate (103) are fixedly connected from top to bottom between the two sides of the inner cavity of the cover body (1021). A buffer assembly (104) is provided on the surface of the battery body (101).

2. The combined cap and cylindrical lithium-ion battery of lithium manganese iron phosphate according to claim 1, characterized in that: The buffer assembly (104) includes a protective shell (1041), a contact (1042) is fixedly connected to the bottom of the inner cavity of the protective shell (1041), the bottom of the contact (1042) extends to the outside of the protective shell (1041), an elastic pressure plate (1043) is provided on the top of the contact (1042), and a sliding ring (1044) is slidably connected to the top and bottom of the surface of the battery body (101), and both sides of the sliding ring (1044) are fixedly connected to the inner wall of the protective shell (1041).

3. The combined cap and cylindrical lithium-ion battery of lithium manganese iron phosphate according to claim 2, characterized in that: The contact (1042) and the elastic pressure plate (1043) are fixedly connected by a conductive wire (1045), and the surface of the protective shell (1041) is provided with heat dissipation holes (1046).

4. The combined cap and cylindrical lithium-ion battery of lithium manganese iron phosphate according to claim 1, characterized in that: The top cover (1028) has six vent holes on its surface, which are evenly distributed on the surface of the top cover (1028).

5. The combined cap and cylindrical lithium-ion battery of lithium manganese iron phosphate according to claim 1, characterized in that: The exhaust pipe (1023) has guide rails fixedly connected to both sides of its inner cavity, and the movable plate (1025) has guide grooves on both sides that cooperate with the guide rails.

6. The combined cap and cylindrical lithium-ion battery of lithium manganese iron phosphate according to claim 1, characterized in that: The top of the sealing block (1027) is fixedly connected with a pointed cone, and the sealing block (1027) is conical in shape.

7. The combined cap and cylindrical lithium-ion battery of lithium manganese iron phosphate according to claim 1, characterized in that: The inner cavity of the sealing ring (1024) is funnel-shaped, and the top of the valve plate (103) is provided with an exhaust groove.

8. The combined cap and cylindrical lithium-ion battery of lithium manganese iron phosphate according to claim 1, characterized in that: The top of the movable plate (1025) has three air supply openings.

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