Battery cell exhaust structure

Abstract

The utility model relates to the technical field of battery cell exhaust, and provides a battery cell exhaust structure which comprises a battery cover plate, a pressure relief device shell, a sealing piece, a connecting piece and an elastic piece, the pressure relief device shell is arranged on the battery cover plate, an exhaust hole communicated with an inner cavity of the pressure relief device shell is formed in the battery cover plate, and the sealing piece is arranged on the pressure relief device shell. The pressure relief device shell is communicated with an exhaust pipe; the sealing piece is arranged in the pressure relief device shell in a sliding mode and used for sliding to block or break away from the exhaust hole. The battery cell exhaust structure is connected to the battery cover plate, and the deformation pressure P1 of the elastic piece is smaller than the valve opening pressure P2 of the anti-explosion valve, so that redundant gas in the battery cell can be quickly exhausted before the anti-explosion valve is opened, the influence of internal air pressure on the performance of the battery cell is reduced, and the phenomenon that the battery cell is damaged when the anti-explosion valve is opened is prevented. And liquid leakage of the explosion-proof valve is caused by overlarge pressure in the battery cell, and the explosion-proof valve is convenient to use.

Description

Technical Field

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

[0002] Lithium-ion batteries have become the mainstream choice in the market due to their high energy density, long cycle life, and lightweight characteristics. During the charging and discharging process of lithium batteries, the internal gas pressure is an extremely important performance and safety factor. High internal gas pressure can cause problems such as bulging of the battery casing and leakage due to the opening of the explosion-proof valve. At the same time, the internal gas pressure also affects the wettability of the electrolyte in the positive and negative electrodes, directly impacting the cell lifespan. Therefore, automatic venting and pressure relief are necessary for lithium batteries.

[0003] Utility model CN217424475U discloses a cell venting device, comprising a support section, a compression section, a driving section, a detection section, and a control section. The support section includes an upper support plate and a lower support plate spaced apart. The compression section is guided and slidably disposed on the lower support plate, with its middle portion bulging out to one side of the lower support plate. The driving section is disposed on the upper support plate and connected to the compression section to drive the compression section to operate. However, the aforementioned cell venting device is inconvenient to connect to the battery cover for automatic venting of gas inside the cell. Therefore, this solution proposes a cell venting structure to address the aforementioned problem. Utility Model Content

[0004] In view of this, the present invention proposes a cell venting structure to solve the technical problem of automatic venting of gas inside the cell, which is inconvenient to connect to the battery cover.

[0005] The technical solution of this utility model is achieved as follows: This utility model provides a battery cell venting structure, including a battery cover, a pressure relief device housing, a sealing element, a connecting element, and an elastic element, wherein,

[0006] The pressure relief device housing is disposed on the battery cover plate, and the battery cover plate is provided with an exhaust hole communicating with the inner cavity of the pressure relief device housing. An exhaust pipe is connected to the pressure relief device housing.

[0007] A sealing element is slidably disposed inside the housing of the pressure relief device, for sliding to block or disengage from the vent hole;

[0008] A connector is disposed on the seal, and the elastic element is fixedly connected to the connector and the housing of the pressure relief device, for resetting the sliding position of the seal.

[0009] Based on the above technical solutions, preferably, the deformation and compression of the elastic element is P1, where 0.2 MPa ≤ P1 ≤ 0.6 MPa.

[0010] Based on the above technical solutions, preferably, the vent includes an upper vent and a lower vent, the upper vent and the lower vent are interconnected and respectively connected to opposite sides of the battery cover plate, and the sealing element includes a first sealing post and a second sealing post fixedly connected to each other, the first sealing post being inserted into the interior of the upper vent and the second sealing post being inserted into the interior of the lower vent.

[0011] Based on the above technical solutions, preferably, both the upper air hole and the lower air hole are circular holes, and the diameter of the upper air hole is larger than the diameter of the lower air hole.

[0012] Based on the above technical solutions, preferably, the height of the lower air hole is H, 0.5mm≤H≤1.5mm.

[0013] Based on the above technical solutions, preferably, the diameter of the lower air hole is R, where 5mm≤R≤25mm.

[0014] Based on the above technical solutions, preferably, the connector has a connecting groove, and the elastic element is inserted into the connecting groove and fixedly connected to the connector and the housing of the pressure relief device.

[0015] Based on the above technical solutions, a preferred embodiment also includes an edge extension component, wherein...

[0016] The pressure relief device has a square outer shell, and the extension piece is also square. The extension piece is located at the bottom of the outer shell of the device. The battery cover has an assembly groove, and the extension piece is inserted into the assembly groove.

[0017] Based on the above technical solutions, preferably, it also includes a negative pressure pump and a conduit, wherein,

[0018] A negative pressure pump is installed on the battery cover plate, and the conduit is connected to the exhaust pipe and the negative pressure pump. The negative pressure pump is used to extract gas from the conduit.

[0019] Based on the above technical solutions, preferably, the conduit is provided with a solenoid valve, which is used to regulate the opening and closing of the conduit.

[0020] The cell venting structure of this utility model has the following advantages over the prior art:

[0021] (1) In specific implementation, the elastic element is set to deform and be compressed to P1. When the gas pressure inside the battery cell is greater than P1, the gas pressure can push out the seal. At this time, the seal slides out of the vent hole, and the excess gas pressure is discharged into the interior of the pressure relief device and discharged from the vent pipe, thus completing the venting and pressure relief treatment of the battery cell. By setting the deformation and compression of the elastic element to P1 to be less than the opening pressure of the explosion-proof valve to P2, the excess gas inside the battery cell can be discharged more quickly before the explosion-proof valve is opened, reducing the impact of internal gas pressure on the battery cell performance and preventing the technical problem of leakage of the explosion-proof valve due to excessive pressure inside the battery cell when the explosion-proof valve is opened, making it convenient to use.

[0022] (2) By setting the first sealing post and the second sealing post to insert the upper air hole and the lower air hole respectively, the sealing element can be double inserted into the exhaust hole. By setting the upper air hole and the lower air hole to have a diameter difference, the sealing performance of the sealing element when inserted into the exhaust hole is increased, which is convenient for use. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a perspective view of the battery cell exhaust structure of this utility model;

[0025] Figure 2 This is a three-dimensional schematic diagram of the connection between the outer shell of the pressure relief device and the battery cover plate of the battery cell venting structure of this utility model.

[0026] Figure 3 The battery cell exhaust structure of this utility model Figure 2 Right view of the structure shown;

[0027] Figure 4 The battery cell exhaust structure of this utility model Figure 3 Cross-sectional view of the structure at point AA shown;

[0028] Figure 5 This is a perspective view of the battery cover plate of the cell venting structure of this utility model;

[0029] Figure 6 This is a bottom perspective view of the sealing element of the battery cell venting structure of this utility model.

[0030] Figure 7 This is a top perspective view of the sealing element of the battery cell venting structure of this utility model.

[0031] In the diagram: 1. Battery cover; 11. Vent hole; 111. Upper vent hole; 112. Lower vent hole; 12. Assembly slot; 2. Pressure relief device housing; 21. Vent pipe; 3. Seal; 31. First sealing post; 32. Second sealing post; 4. Connector; 41. Connecting groove; 5. Elastic element; 6. Extension element; 71. Negative pressure pump; 72. Conduit; 73. Solenoid valve. Detailed Implementation

[0032] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0033] like Figures 1-7 As shown, the cell venting structure of this utility model is characterized by comprising a battery cover plate 1, a pressure relief device housing 2, a sealing element 3, a connecting element 4, and an elastic element 5. The pressure relief device housing 2 is disposed on the battery cover plate 1, and the battery cover plate 1 has a vent hole 11 communicating with the inner cavity of the pressure relief device housing 2. The pressure relief device housing 2 is connected to a vent pipe 21. The sealing element 3 is slidably disposed inside the pressure relief device housing 2 and is used to slide to block or disengage from the vent hole 11. The connecting element 4 is disposed on the sealing element 3, and the elastic element 5 is fixedly connected to the connecting element 4 and the pressure relief device housing 2 and is used to reset the sliding position of the sealing element 3.

[0034] In practice, the outer shell 2, the sealing element 3, and the connecting element 4 of the pressure relief device are all square parts.

[0035] In practice, the pressure relief device housing 2 is connected to the negative terminal of the battery cell. The liquid injection port is located on the positive terminal side.

[0036] Preferably, the outer shell 2 of the pressure relief device is an aluminum shell, the sealing element 3 is a vulcanized rubber element or a polypropylene element, and the elastic element 5 is a silicone element.

[0037] Preferably, the interior of the pressure relief device housing 2 is filled with a desiccant.

[0038] In specific implementation, the elastic element 5 is set to deform under pressure P1. When the gas pressure inside the battery cell is greater than P1, the gas pressure can push out the sealing element 3. At this time, the sealing element 3 slides out of the vent hole 11, and the excess gas pressure is discharged into the interior of the pressure relief device housing 2 and discharged from the vent pipe 21, thereby completing the venting and pressure relief treatment of the battery cell. By setting the deformation pressure P1 of the elastic element 5 to be less than the opening pressure P2 of the explosion-proof valve, excess gas inside the battery cell can be discharged more quickly before the explosion-proof valve opens, reducing the impact of internal gas pressure on the battery cell performance and preventing the technical problem of leakage of the explosion-proof valve due to excessive pressure inside the battery cell when it is opened, thus facilitating use.

[0039] In a preferred embodiment, the deformation and compression of the elastic element 5 is P1, where 0.2 MPa ≤ P1 ≤ 0.6 MPa.

[0040] This design ensures that the deformation pressure of the elastic element 5 is less than the opening pressure of the explosion-proof valve.

[0041] like Figures 3-6 As shown, in a preferred embodiment, the vent 11 includes an upper vent 111 and a lower vent 112. The upper vent 111 and the lower vent 112 are interconnected and are respectively connected to opposite sides of the battery cover plate 1. The sealing member 3 includes a first sealing post 31 and a second sealing post 32 that are fixedly connected to each other. The first sealing post 31 is inserted into the interior of the upper vent 111, and the second sealing post 32 is inserted into the interior of the lower vent 112.

[0042] Both the upper vent 111 and the lower vent 112 are circular holes, and the diameter of the upper vent 111 is larger than that of the lower vent 112.

[0043] By setting the first sealing post 31 and the second sealing post 32 to be inserted into the upper air hole 111 and the lower air hole 112 respectively, the sealing member 3 can be double-inserted into the exhaust hole 11. By setting the upper air hole 111 and the lower air hole 112 to have a difference in diameter, the sealing performance of the sealing member 3 when it is inserted into the exhaust hole 11 is increased, which makes it convenient to use.

[0044] The height of the lower vent 112 is H, 0.5mm≤H≤1.5mm.

[0045] The diameter of the lower air vent 112 is R, where 5mm ≤ R ≤ 25mm.

[0046] In practical implementation, H = 1mm. This design allows the elastic element 5 to contract by a small distance under pressure, enabling the first sealing column 31 to disengage from the lower vent 112. This further compresses the volume of the entire pressure relief device housing 2, minimizing the space required for assembly and facilitating use. By setting 5mm ≤ R ≤ 25mm, the lower vent 112 can maximize venting while reducing its space requirements, facilitating the overall installation of the battery cover 1 and improving usability.

[0047] like Figure 7 As shown, in a preferred embodiment, the connector 4 has a connecting groove 41, and the elastic member 5 is inserted into the connecting groove 41 and fixedly connected to the connector 4 and the housing 2 of the pressure relief device.

[0048] This design is intended to increase the deformation stability of the elastic element 5.

[0049] like Figure 1 As shown, in a preferred embodiment, it also includes an extension piece 6, wherein the pressure relief device housing 2 is a square housing, the extension piece 6 is a square piece, the extension piece 6 is disposed at the bottom of the device housing 2, and the battery cover plate 1 has an assembly groove 12, the extension piece 6 is inserted into the inside of the assembly groove 12.

[0050] This design facilitates the assembly of the pressure relief device housing 2, and at the same time, the assembly stability of the pressure relief device housing 2 is increased by the constraint of the assembly groove 12 wall.

[0051] In a preferred embodiment, the system also includes a negative pressure pump 71 and a conduit 72. The negative pressure pump 71 is disposed on the battery cover plate 1, and the conduit 72 is connected to the exhaust pipe 21 and the negative pressure pump 71. The negative pressure pump 71 is used to extract gas from the conduit 72.

[0052] A solenoid valve 73 is provided on the conduit 72, which is used to regulate the opening and closing of the conduit 72.

[0053] In practice, the gas discharged from the vent 11 can be temporarily stored inside the pressure relief device housing 2. When it is necessary to discharge the gas inside the pressure relief device housing 2, the solenoid valve 73 is opened and the negative pressure pump 71 is started to extract the gas from the pressure relief device housing 2.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cell exhaust structure, characterized in that: It includes a battery cover (1), a pressure relief device housing (2), a seal (3), a connector (4), and an elastic element (5), wherein, The pressure relief device housing (2) is disposed on the battery cover plate (1), and the battery cover plate (1) is provided with an exhaust hole (11) that communicates with the inner cavity of the pressure relief device housing (2), and an exhaust pipe (21) is connected to the pressure relief device housing (2); A sealing element (3) is slidably disposed inside the housing (2) of the pressure relief device for sliding to block or disengage from the vent (11); A connector (4) is disposed on the seal (3), and the elastic element (5) is fixedly connected to the connector (4) and the housing (2) of the pressure relief device, for resetting the sliding position of the seal (3).

2. The cell exhaust structure as described in claim 1, characterized in that: The deformation and compression of the elastic element (5) is P1, where 0.2 MPa ≤ P1 ≤ 0.6 MPa.

3. The cell exhaust structure as described in claim 1, characterized in that: The exhaust port (11) includes an upper vent (111) and a lower vent (112). The upper vent (111) and the lower vent (112) are interconnected and connected to opposite sides of the battery cover (1). The sealing element (3) includes a first sealing post (31) and a second sealing post (32) that are fixedly connected to each other. The first sealing post (31) is inserted into the interior of the upper vent (111), and the second sealing post (32) is inserted into the interior of the lower vent (112).

4. The cell exhaust structure as described in claim 3, characterized in that: Both the upper air hole (111) and the lower air hole (112) are circular holes, and the diameter of the upper air hole (111) is larger than the diameter of the lower air hole (112).

5. The cell exhaust structure as described in claim 4, characterized in that: The height of the lower air hole (112) is H, 0.5mm≤H≤1.5mm.

6. The cell exhaust structure as described in claim 4, characterized in that: The diameter of the lower air hole (112) is R, 5mm≤R≤25mm.

7. The cell exhaust structure as described in claim 1, characterized in that: The connector (4) has a connecting groove (41), and the elastic member (5) is inserted into the connecting groove (41) and fixedly connected to the connector (4) and the housing (2) of the pressure relief device.

8. The cell exhaust structure as described in claim 1, characterized in that: It also includes the extension piece (6), wherein, The pressure relief device housing (2) is a square housing, the extension piece (6) is a square piece, the extension piece (6) is located at the bottom of the housing (2), the battery cover plate (1) has an assembly groove (12), and the extension piece (6) is inserted into the inside of the assembly groove (12).

9. The cell exhaust structure as described in claim 1, characterized in that: It also includes a negative pressure pump (71) and a conduit (72), wherein, A negative pressure pump (71) is installed on the battery cover plate (1), and the conduit (72) is connected to the exhaust pipe (21) and the negative pressure pump (71). The negative pressure pump (71) is used to extract gas from the conduit (72).

10. The cell exhaust structure as described in claim 9, characterized in that: The conduit (72) is equipped with a solenoid valve (73), which is used to regulate the opening and closing of the conduit (72).

Images