Fusing positive pole structure

Abstract

The utility model relates to a fusible positive pole structure, which belongs to the technical field of batteries and comprises a top cover plate, a mounting hole is arranged at the top end of the top cover plate, a pole body is hermetically mounted in the mounting hole, and the pole body comprises a mounting bottom plate, a connecting column fixed at the top end of the mounting bottom plate and a mounting top plate fixed at the top end of the connecting column. The sectional area of the connecting column is smaller than the sectional area of the mounting bottom plate, and the sectional area of the connecting column is smaller than the sectional area of the mounting top plate. According to the utility model, the battery can be quickly fused when thermal runaway occurs, so that the safety of the battery cell is effectively ensured.

Description

Technical Field

[0001] The utility model relates to a fusible positive pole structure, belonging to the technical field of batteries. Background Art

[0002] Currently, facing numerous challenges such as resource shortages and environmental pollution, sustainable development has become a global consensus. Under the "dual carbon" strategic goal, new energy sources will gradually replace traditional, environmentally polluting energy sources. Batteries, as a carrier for storing electrical energy, can be used to store and transport electricity generated by power plants, and are of great significance to the development of the new energy industry.

[0003] Lithium-ion batteries, with their high capacity density, high specific energy, and long cycle life, have become the battery of choice for portable electronics, electric vehicles, and energy storage, and are finding increasingly widespread use. In addition to their high capacity, batteries must also offer excellent safety and a long cycle life to meet usage standards and satisfy consumer needs.

[0004] At present, in order to ensure the safety of batteries, a fuse structure is usually set up. In the existing design, the fuse structure of the battery is surrounded by electrolyte. Before the fuse structure melts, the electrolyte attached to the fuse structure will evaporate. The evaporation of the electrolyte absorbs heat and takes away a large amount of heat, which will prolong the melting time.

[0005] A battery top cover, a battery pack and a vehicle having the same are disclosed in a Chinese invention patent with publication number CN116826293A. The battery top cover includes: a top cover body; a low-melting-point metal layer, the low-melting-point metal layer is located at the bottom of the top cover body, and a first liquid storage space is formed between the top cover body and the low-melting-point metal layer. The liquid stored in the first liquid storage space includes at least one of an inhibitor, a flame retardant, a fire extinguishing agent, and an electrolyte additive. The low-melting-point metal layer is arranged near the battery box, and a battery cell is arranged inside the box. The low-melting-point metal layer has a closed state below its own melting point and a fused state above its own melting point. When the battery cell suffers thermal runaway, the low-melting-point metal layer is in a fused state to release the liquid in the first liquid storage space.

[0006] The above-mentioned reference example uses a low-melting-point metal layer as the fuse structure of the battery, and enters a fuse state at a melting point higher than the melting point of the low-melting-point metal layer, thereby protecting the battery. However, since a first liquid storage space is formed between the top cover body and the low-melting-point metal layer, when the low-melting-point metal layer melts, the first liquid storage space will absorb a large amount of heat, thereby prolonging the fuse time and causing poor safety. Therefore, improvement is urgently needed. Utility Model Content

[0007] In order to overcome the above-mentioned disadvantages in the prior art, the present utility model designs a fusible positive pole column structure, which can be quickly fused when the battery undergoes thermal runaway, effectively ensuring the safety of the battery cell.

[0008] In order to achieve the above object, the present utility model adopts the following technical solutions:

[0009] A fusible positive pole column structure includes a top cover plate. An installation hole is opened at the top end of the top cover plate, and a pole column body is hermetically installed in the installation hole. The pole column body includes an installation bottom plate, a connection column fixed to the top end of the installation bottom plate, and an installation top plate fixed to the top end of the connection column. The cross-sectional area of the connection column is smaller than that of the installation bottom plate, and the cross-sectional area of the connection column is smaller than that of the installation top plate.

[0010] Further, a plastic part with a two-stage stepped structure is sleeved outside the connection column. The bottom end of the plastic part is attached to the top end of the installation bottom plate, and the top end of the plastic part is attached to the bottom end of the installation top plate.

[0011] Further, the plastic part includes plastic one and plastic two that are spliced with each other. A clamping column is fixedly connected to the docking end of the plastic one, and a clamping hole sleeved with the clamping column is opened at the docking end of the plastic two.

[0012] Further, a metal heat dissipation ring is sleeved on the outer side of the upper stepped column of the plastic part. The bottom end of the metal heat dissipation ring is attached to the top surface of the lower stepped column of the plastic part, and the metal heat dissipation ring is clamped between the upper stepped column of the plastic part and the installation hole.

[0013] Further, a heat dissipation blind hole is opened at the middle position of the top end of the installation top plate, and the bottom end of the heat dissipation blind hole extends into more than half of the height of the connection column.

[0014] Further, a fixing part with a middle opening is detachably installed at the top end of the top cover plate. The fixing part is sleeved outside the installation top plate, and an extension ring is extended inside the fixing part. The extension ring is arranged between the installation top plate and the metal heat dissipation ring, and the inner side of the extension ring is tightly sleeved outside the upper stepped column of the plastic part.

[0015] Further, a sealing ring is clamped between the top end of the installation bottom plate and the bottom end of the top cover plate, and the sealing ring is sleeved outside the lower stepped column of the plastic part.

[0016] Further, an annular groove is opened at the top end of the installation bottom plate, and the annular groove is arranged at the lower end of the plastic part.

[0017] Further, the installation hole is a rectangular hole.

[0018] Further, the cross-section of the plastic part is a rectangular frame structure.

[0019] Compared with the prior art, the utility model has the following characteristics and beneficial effects:

[0020] In the utility model, when an accident such as a short circuit occurs in the battery cell, since the cross-sectional area at the connecting column is the smallest, the connecting column will be melted, thereby disconnecting the power supply to ensure the safety of the battery cell. And during the continuous heating process of the connecting column, the first plastic and the second plastic will quickly melt, increasing the internal resistance of the pole column body, thereby accelerating the melting of the pole column body; after the pole column body is melted, the generated molten beads can be collected through the annular groove, preventing the molten beads from dripping into the battery cell and generating side reactions, resulting in the battery cell catching fire and exploding. And after the pole column body is melted, the gas inside the battery cell can be discharged in time through the heat dissipation blind holes, playing a role in pressure relief and further ensuring the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic installation structure diagram of the utility model;

[0022] Figure 2 is a schematic cross-sectional installation structure diagram of the utility model;

[0023] Figure 3 is a schematic partial structure diagram of the top cover sheet of the utility model;

[0024] Figure 4 is a three-dimensional structure diagram of the pole column body of the utility model;

[0025] Figure 5 is Figure 2 a partial enlarged structure diagram at position A of

[0026] Figure 6 is a three-dimensional structure diagram of the first plastic of the utility model;

[0027] Figure 7 is a three-dimensional structure diagram of the second plastic of the utility model.

[0028] Wherein the reference numerals are: 1, top cover sheet; 11, fixing member; 111, extension ring; 12, mounting hole; 2, first plastic; 21, clamping column; 3, pole column body; 31, connecting column; 32, annular groove; 33, heat dissipation blind hole; 34, mounting bottom plate; 35, mounting top plate; 4, second plastic; 41, clamping hole; 5, metal heat dissipation ring; 6, sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following describes the utility model in more detail with reference to the embodiments.

[0030] Please refer to Figures 1 to 7, The fusible positive pole column structure of this embodiment includes a top cover plate 1. An installation hole 12 is opened at the top of the top cover plate 1. A pole column body 3 is hermetically installed in the installation hole 12. The pole column body 3 includes an installation bottom plate 34, a connection column 31 fixed to the top of the installation bottom plate 34, and an installation top plate 35 fixed to the top of the connection column 31. The cross-sectional area of the connection column 31 is smaller than that of the installation bottom plate 34, and the cross-sectional area of the connection column 31 is smaller than that of the installation top plate 35.

[0031] As can be seen from the above description, the beneficial effect of the present utility model is that by setting the cross-sectional area of the connection column 31 to be the smallest, it can be quickly fused in the event of an accident such as a short circuit in the battery cell, thereby ensuring the safety of the battery cell and avoiding the situation in the existing design where the electrolyte is arranged around the fusing structure and affects the fusing effect.

[0032] Furthermore, a plastic part with a two-stage stepped structure is sleeved outside the connection column 31. The bottom end of the plastic part is attached to the top of the installation bottom plate 34, and the top end of the plastic part is attached to the bottom of the installation top plate 35. Through the setting of the plastic part, when the temperature of the pole column body 3 is too high, the plastic part will be melted, thereby increasing the internal resistance of the pole column body 3, and then effectively accelerating the fusing of the pole column body 3.

[0033] In this embodiment, the material of the plastic part is conductive PPS.

[0034] Specifically, the plastic part includes a plastic one 2 and a plastic two 4 that are spliced with each other. A clamping column 21 is fixedly connected to the docking end of the plastic one 2. A clamping hole 41 that is sleeved with the clamping column 21 is opened at the docking end of the plastic two 4. The plastic one 2 and the plastic two 4 are sleeved outside the pole column body 3, which can improve the strength change of the pole column body 3 caused by the reduction of the cross-section at the position of the connection column 31.

[0035] Furthermore, a metal heat dissipation ring 5 is sleeved on the outer side of the upper stepped column of the plastic part. The bottom end of the metal heat dissipation ring 5 is attached to the top surface of the lower stepped column of the plastic part, and the metal heat dissipation ring 5 is clamped between the upper stepped column of the plastic part and the installation hole 12. Through the setting of the metal heat dissipation ring 5 and clamping the metal heat dissipation ring 5 between the upper stepped column of the plastic part and the installation hole 12, the heat generated by the pole column body 3 can be quickly conducted to the heat dissipation ring 5 through the plastic part, and then conducted to the top cover plate 1 by the heat dissipation ring 5 for heat dissipation, which can enhance the heat dissipation capacity of the device and ensure the safety of the battery cell.

[0036] Furthermore, a heat dissipation blind hole 33 is provided in the middle of the top end of the installation top plate 35. The bottom end of the heat dissipation blind hole 33 extends into the connection column 31 by more than half of its height. The setting of the heat dissipation blind hole 33 allows the outside to be in direct contact with the connection column 31 during normal operation, which can accelerate the heat dissipation of the pole column body 3. At the same time, when the pole column body 3 fuses, the gas generated inside the battery cell can quickly escape from the heat dissipation blind hole 33, preventing the battery from exploding due to excessive internal pressure and playing a pressure relief role.

[0037] Furthermore, a fixing member 11 with a middle opening is detachably installed at the top end of the top cover plate 1. The fixing member 11 is sleeved outside the installation top plate 35, and an extension ring 111 is extended inside the fixing member 11. The extension ring 111 is arranged between the installation top plate 35 and the metal heat dissipation ring 5, and the inner side of the extension ring 111 is fittingly sleeved outside the upper stepped column of the plastic part. The setting of the fixing member 11 facilitates the installation of the pole column body 3.

[0038] Furthermore, a sealing ring 6 is clamped between the top end of the installation bottom plate 34 and the bottom end of the top cover plate 1, and the sealing ring 6 is sleeved outside the lower stepped column of the plastic part.

[0039] Furthermore, an annular groove 32 is provided at the top end of the installation bottom plate 34, and the annular groove 32 is arranged at the lower end of the plastic part. The setting of the annular groove 32 can store the molten beads after the pole column body 3 fuses, preventing the molten beads from dripping into the battery cell and causing side reactions that lead to the battery cell catching fire and exploding.

[0040] Furthermore, the installation hole 12 is a rectangular hole, and the cross-section of the plastic part is a rectangular frame structure, greatly improving the torsional resistance of the overall structure.

[0041] The working principle of the present utility model: When an accident such as a short circuit occurs in the battery cell, such as a short circuit, since the cross-sectional area at the connection column 31 is the smallest, the connection column 31 will be fused, thereby cutting off the power supply to ensure the safety of the battery cell. And during the continuous heating process of the connection column 31, the plastic one 2 and the plastic two 4 will quickly melt, increasing the internal resistance of the pole column body 3, thus accelerating the fusing of the pole column body 3; after the pole column body 3 is fused, the generated molten beads can be collected through the annular groove 32, preventing the molten beads from dripping into the battery cell and causing side reactions that lead to the battery cell catching fire and exploding. And after the pole column body 3 is fused, the gas inside the battery cell can be discharged in time through the heat dissipation blind hole 33, playing a pressure relief role.

[0042] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", "upper", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model.

[0043] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the term "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

Claims

1. A fusible positive pole post structure, comprising a top cover sheet (1), an installation hole (12) is formed at the top end of the top cover sheet (1), and a pole post body (3) is hermetically installed in the installation hole (12), and the feature is that: The pole body (3) includes a mounting base plate (34), a connecting column (31) fixed to the top end of the mounting base plate (34), and a mounting top plate (35) fixed to the top end of the connecting column (31). The cross-sectional area of the connecting column (31) is smaller than that of the mounting base plate (34), and the cross-sectional area of the connecting column (31) is smaller than that of the mounting top plate (35).

2. The structure of a fusible positive pole column according to claim 1, characterized in that: A plastic part with a two-stage stepped structure is sleeved outside the connecting column (31). The bottom end of the plastic part is arranged in contact with the top end of the mounting base plate (34), and the top end of the plastic part is arranged in contact with the bottom end of the mounting top plate (35).

3. The structure of a fusible positive pole column according to claim 2, characterized in that: The plastic part includes a plastic one (2) and a plastic two (4) spliced with each other. A clamping column (21) is fixedly connected to the docking end of the plastic one (2), and a clamping hole (41) sleeved with the clamping column (21) is formed in the docking end of the plastic two (4).

4. A fusible positive pole post structure according to claim 2, characterized in that: A metal heat dissipation ring (5) is sleeved on the outer side surface of the upper stepped column of the plastic part. The bottom end of the metal heat dissipation ring (5) is arranged in contact with the top surface of the lower stepped column of the plastic part, and the metal heat dissipation ring (5) is clamped between the upper stepped column of the plastic part and the mounting hole (12).

5. The structure of a fusible positive electrode post according to claim 1, wherein: A heat dissipation blind hole (33) is formed in the middle position of the top end of the mounting top plate (35), and the bottom end of the heat dissipation blind hole (33) extends into more than half of the height of the connecting column (31).

6. The structure of a fusible positive electrode terminal according to claim 4, characterized in that: A fixing part (11) with a middle opening is detachably mounted on the top end of the top cover piece (1). The fixing part (11) is sleeved outside the mounting top plate (35), and an extension ring (111) is extended and arranged on the inner circle of the fixing part (11). The extension ring (111) is arranged between the mounting top plate (35) and the metal heat dissipation ring (5), and the inner side of the extension ring (111) is arranged in contact and sleeved on the outer side of the upper stepped column of the plastic part.

7. The structure of a fusible positive pole post according to claim 4, characterized in that: A sealing ring (6) is clamped between the top end of the mounting base plate (34) and the bottom end of the top cover piece (1), and the sealing ring (6) is sleeved on the outer side of the lower stepped column of the plastic part.

8. The structure of a fusible positive pole post according to claim 4, characterized in that: An annular groove (32) is formed in the top end of the mounting base plate (34), and the annular groove (32) is arranged at the lower end of the plastic part.

9. The structure of a fusible positive pole post according to claim 1, wherein: The mounting hole (12) is a rectangular hole.

10. A fusible positive pole column structure according to claim 4, characterized in that: The cross-section of the plastic part is a rectangular frame structure.

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