Cover plate assembly, battery, battery pack and electric equipment

Abstract

The utility model discloses a cover plate assembly, a battery, a battery pack and electric equipment, the cover plate assembly comprises: a cover plate provided with an opening; the first sealing element is arranged at the opening in a covering manner so as to seal the opening; the sealing assembly is arranged on the side, away from the battery cell, of the cover plate, and the sealing assembly and the first sealing piece are oppositely arranged; and the air pressure measuring assembly penetrates through the sealing assembly and the first sealing element and extends towards the battery cell. The internal air pressure is measured after the air pressure measuring assembly penetrates through the sealing assembly and the first sealing piece, the gap between the air pressure measuring assembly and other structures is extremely small, the air tightness is better, the air pressure in the cavity can be monitored in real time, and the device is suitable for actual products.

Description

Technical Field

[0001] This utility model relates to the field of air pressure measurement technology, and in particular to a cover plate assembly, a battery, a battery pack, and an electrical device. Background Technology

[0002] In related technologies, a pressure measuring device includes a pressure measuring component and a conduit. One end of the conduit is connected to the pressure measuring component, and the other end is used to communicate with the location to be measured. The connection method is welding and plugging.

[0003] However, the welded and plugged parts are prone to air leakage, making it difficult to guarantee airtightness. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a cover plate assembly in which an air pressure measuring component measures the internal air pressure after passing through the sealing assembly and the first seal, resulting in better airtightness.

[0005] A cover plate assembly according to a first aspect of the present invention includes: a cover plate having an opening; a first sealing member covering the opening to seal it; a sealing assembly disposed on the side of the cover plate away from the battery cell, the sealing assembly and the first sealing member being disposed opposite to each other; and a pressure measuring assembly passing through the sealing assembly and the first sealing member and extending toward the battery cell.

[0006] According to the embodiment of the present invention, the cover plate assembly measures the internal air pressure by passing through the sealing assembly and the first sealing element with the air pressure measuring component. The gap between the air pressure measuring component and other structures is extremely small, resulting in better airtightness. It can monitor the internal air pressure of the cavity in real time and is suitable for actual products.

[0007] According to some embodiments of the present invention, the air pressure measuring component includes: a measuring element and an air guide element, one end of the measuring element and one end of the air guide element are connected to each other, the other end of the measuring element passes through the first sealing element and extends toward the battery cell, and the other end of the air guide element is connected to the air pressure measuring element.

[0008] According to some embodiments of this utility model, a buffer medium is provided inside the air guide.

[0009] According to some embodiments of the present invention, the air guide is provided with a backflow preventer, which is disposed between the buffer medium and the measuring element.

[0010] According to some embodiments of this utility model, the height of the first sealing element is h1, the length of the measuring element is h2, and h1 and h2 satisfy the relationship: 2mm≤h2-h1≤20mm.

[0011] According to some embodiments of this utility model, the diameter of the measuring element is d, and d satisfies the relationship: 0.5mm≤d≤4mm.

[0012] According to some embodiments of the present invention, one end of the air guide is provided with a first conical surface; and / or, one end of the measuring element is provided with a second conical surface.

[0013] According to some embodiments of the present invention, the sealing assembly includes: a second sealing member, the second sealing member being disposed on the side of the cover plate away from the battery cell, the second sealing member being wrapped around the outside of the air pressure measuring assembly, and the second sealing member and the first sealing member being disposed opposite to each other.

[0014] According to some embodiments of the present invention, the sealing assembly further includes: a support member, the support member having a through hole, the second sealing member being disposed in the through hole, and one end of the support member being connected to the cover plate.

[0015] According to some embodiments of the present invention, the cover plate is provided with an avoidance groove, and the outer periphery of the support member facing the cover plate is provided with an annular flange, which is disposed in the avoidance groove.

[0016] According to some embodiments of the present invention, the second sealing element is one or more of acrylate sealant, epoxy sealant, and silicone sealant.

[0017] According to some embodiments of the present invention, the sealing assembly further includes a sealing cap, which is disposed on the side of the second sealing member away from the first sealing member, and the sealing cap and the air pressure measuring assembly are sealed together.

[0018] A battery according to a second aspect of the present invention includes: a housing having an accommodating space formed therein; a battery cell disposed within the accommodating space; and a cover assembly covering the housing and sealing the accommodating space.

[0019] The battery pack according to a third aspect of the present invention includes at least two of the batteries.

[0020] The electrical device according to the fourth aspect of the present invention includes the battery pack.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of the present utility model;

[0024] Figure 2 yes Figure 1 AA section view in the middle;

[0025] Figure 3 yes Figure 2 A partial schematic diagram of B in the diagram;

[0026] Figure 4 This is a structural schematic diagram of the support member according to an embodiment of the present utility model;

[0027] Figure 5 This is a front view of the support member according to an embodiment of the present utility model;

[0028] Figure 6 This is a top view of the support member according to an embodiment of the present utility model.

[0029] Figure label:

[0030] 1000, battery;

[0031] 100. Cover plate assembly;

[0032] 10. Cover plate; 11. Clearance groove;

[0033] 20. First sealing element;

[0034] 30. Sealing assembly; 31. Second seal; 32. Support; 321. Through hole; 322. Annular flange; 33. Sealing cap;

[0035] 40. Barometric pressure measuring assembly; 41. Air guide; 411. First conical surface; 42. Measuring component; 421. Second conical surface;

[0036] 200. Shell; 201. Accommodation space. Detailed Implementation

[0037] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0038] The following is for reference. Figures 1-6The present invention describes a cover plate assembly 100 according to an embodiment of the present invention, and also provides a battery 1000, a battery pack, and further, an electrical device.

[0039] Reference Figures 2-3 As shown, the cover plate assembly 100 of this utility model embodiment includes: a cover plate 10, a first sealing member 20, a sealing assembly 30, and a pressure measuring assembly 40.

[0040] The cover plate 10 has an opening, and the first sealing element 20 is placed over the opening to seal it. A sealing assembly 30 is located on the side of the cover plate 10 away from the battery cell. The sealing assembly 30 and the first sealing element 20 are positioned opposite each other. A pressure measuring assembly 40 passes through the sealing assembly 30 and the first sealing element 20 and extends towards the battery cell. Specifically, the cover plate 10 has an opening to allow the pressure measuring assembly 40 to pass through and measure the pressure inside the cover plate 10. Both the sealing assembly 30 and the first sealing element 20 improve the airtightness of the cover plate assembly 100. The first sealing element 20 can be made of rubber; in this embodiment, it is a rubber plug that seals the opening. After passing through the sealing assembly 30 and the first sealing element 20, the pressure measuring assembly 40 measures the pressure inside the cover plate 10. The gap between the pressure measuring assembly 40 and other structures is minimal, resulting in better airtightness, suitable for actual products.

[0041] The rubber stopper can also be made of materials such as silicone, polyurethane (PU), cork, polytetrafluoroethylene (PTFE), and EVA foam.

[0042] Therefore, the internal air pressure is measured by passing through the sealing assembly 30 and the first seal 20 via the air pressure measuring component 40. The gap between the air pressure measuring component 40 and other structures is extremely small, resulting in better airtightness. It can monitor the internal air pressure of the cavity in real time and is suitable for actual products.

[0043] Reference Figure 3 As shown, the air pressure measuring assembly 40 includes a measuring element 42 and an air guide element 41. One end of the measuring element 42 and one end of the air guide element 41 are connected to each other. The other end of the measuring element 42 passes through the first sealing element 20 and extends towards the battery cell. The other end of the air guide element 41 is connected to the air pressure measuring element 42. Specifically, the measuring element 42 can be a probe, and the air guide element 41 can be an air guide tube. The probe is inserted into the first sealing element 20, and the tip of the probe extends into the internal cavity. The upper end of the probe is connected to the air guide tube, which is connected to the air pressure measuring element 42. In this way, a passage for the external air pressure measuring element 42 to measure the internal air pressure is established using the opening on the cover plate 10, thus realizing the air pressure measuring function of the cover plate assembly 100.

[0044] Furthermore, using a probe to measure the internal air pressure of the cavity enhances the stability of the cover assembly 100, enabling pressure measurement even in extreme conditions. Specifically, according to F=P×A, even with a high internal air pressure P, the outward force F of the gas is not significant due to the small cross-sectional area A of the probe, effectively preventing the pressure measuring device from detaching. Therefore, in addition to normal cyclic operation (low internal air pressure, approximately atmospheric pressure), it can also be used for pressure measurement and early warning in extreme conditions such as thermal runaway. Specifically, when the internal air pressure is high, reaching 5-15 atmospheres, or when there is excessive gas production or poor internal venting, the internal air pressure may exceed 40 atmospheres. Using a larger measuring structure would result in an extremely large outward force, potentially causing the cover assembly 100 to break and detach.

[0045] The connection between the measuring component 42 and the air guide component 41 can be either plug-in or glued.

[0046] Furthermore, the probe tip can be made of metal, ceramic, plastic, etc. The air delivery tube can be a flexible tube, made of silicone, PE (polyethylene), or PP (polypropylene). The air delivery tube can also be a rigid tube, such as aluminum or ceramic.

[0047] Furthermore, a buffer medium is provided inside the gas guide 41. Specifically, the gas guide 41 may contain a liquid medium, such as silicone oil, to prevent internal gases from directly acting on the pressure measuring element 42 and to prevent gas corrosion of the pressure measuring element 42. Moreover, when measuring the internal pressure of the battery cell, in the event of thermal runaway of the battery 1000, the buffer medium can prevent the high-temperature gases generated internally from directly acting on the pressure measuring element 42, thus preventing the pressure measuring element 42 from failing due to excessive temperature.

[0048] Furthermore, to prevent the liquid medium from flowing too close to the cell side or into the battery 1000, a backflow preventer is provided on the venting component 41. The backflow preventer is located between the buffer medium and the measuring component 42 to improve the safety of the cover assembly 100.

[0049] It should also be noted that the pressure measuring device 42 includes a pressure sensor and a data acquisition unit. The pressure sensor is connected to the gas guide 41 to acquire the gas pressure signal and convert it into an electrical signal that can characterize the gas pressure. The data acquisition unit is electrically connected to the pressure sensor to transmit the electrical signal characterizing the gas pressure acquired by the pressure sensor to a host computer, such as, but not limited to, a data analysis terminal device or a data processing database, so that the pressure inside the cavity can be recorded in real time.

[0050] Reference Figure 3As shown, the height of the first sealing element 20 is h1, and the length of the measuring element 42 is h2. h1 and h2 satisfy the relationship: 2mm ≤ h2 - h1 ≤ 20mm. That is, the length of the measuring element 42 must be longer than the first sealing element 20, but the length difference must be controlled within the range of 2mm-20mm. This ensures that the top of the measuring element 42 can pass through the first sealing element 20 and be fully exposed, preventing the top of the measuring element 42 from being blocked by the first sealing element 20. This ensures that the measuring element 42 can contact the cavity inside the cover plate 10 to achieve the air pressure measurement function. Of course, the measuring element 42 cannot be too long to avoid puncturing critical components inside the cavity, causing short circuits or other problems, thus improving the reliability of the cover plate assembly 100.

[0051] Reference Figure 3 As shown, the diameter of the measuring component 42 is d, which satisfies the relationship: 0.5mm ≤ d ≤ 4mm. That is, the diameter of the probe tip is no greater than 4mm and no less than 0.5mm. A probe tip that is too thick will encounter greater resistance when passing through the first seal 20, making assembly difficult. A probe tip that is too thin will have lower efficiency and accuracy when measuring the gas pressure inside the chamber. An excessively thin probe tip increases gas resistance, affecting the speed at which gas flows into the probe tip, thus affecting the accuracy of pressure measurement. Pressure changes may not be reflected in real time, leading to delayed or inaccurate readings. Furthermore, excessively thin probe tips are easily clogged by small impurities, dust, or tiny particles, especially in unclean environments during measurement. Even minor clogging can lead to measurement failure or inaccuracy.

[0052] Reference Figure 3 As shown, one end of the air guide 41 is provided with a first conical surface 411, that is, the diameter of the end of the air guide 41 that contacts the measuring element 42 gradually decreases, so as to facilitate cooperation with the measuring element 42. Furthermore, one end of the measuring element 42 is provided with a second conical surface 421, which allows the measuring element 42 to easily penetrate the first seal 20 and enter the cavity for air pressure measurement.

[0053] Reference Figure 3 As shown, the sealing assembly 30 includes a second seal 31, which is disposed on the side of the cover plate 10 away from the battery cell. The second seal 31 wraps around the outside of the pressure measuring assembly 40, and the second seal 31 and the first seal 20 are disposed opposite to each other. To further improve the airtightness of the cover plate assembly 100, the second seal 31 can be wrapped around the outside of the pressure measuring assembly 40. The second seal 31 can be a sealant, which can prevent air leakage and fix the needle to prevent it from falling off or shaking, thereby further improving the airtightness of the pressure measurement.

[0054] Reference Figures 4-6As shown, the sealing assembly 30 also includes a support member 32, which has a through hole 321. The second sealing member 31 is disposed within the through hole 321, and one end of the support member 32 is connected to the cover plate 10. The support member 32 is a rigid structure. When the air guide member 41 is a flexible hose, the support member 32 needs to be placed outside the air guide member 41 to protect it from damage by other structures and extend its service life. The second sealing member 31 can be disposed within the through hole 321. That is, after the measuring member 42 and the air guide member 41 are inserted into the first sealing member 20 through the through hole 321, the second sealing member 31 is wrapped around the outside of the air guide member 41.

[0055] In some embodiments, the support member 32 may be omitted, and the measuring member 42 and the air guide member 41 may be inserted into the first sealing member 20 through the through hole 321 and then sealed with glue on the outside.

[0056] In some embodiments, sealing tape or heat shrink tubing can be used to seal the top of the support 32 and the air guide 41 to further enhance the sealing performance.

[0057] Reference Figure 3 As shown, the cover plate 10 is provided with a relief groove 11, and the support member 32 is provided with an annular flange 322 on the outer periphery of one end facing the cover plate 10. The annular flange 322 is disposed in the relief groove 11. The annular flange 322 and the relief groove 11 can be fixed by welding. Specifically, the relief groove 11 can be a countersunk hole, and the annular flange 322 is welded in the countersunk hole to fix the support member 32 and the cover plate 10.

[0058] The second seal 31 is one or more of acrylic sealant, epoxy sealant and silicone sealant.

[0059] Reference Figure 3 As shown, the sealing assembly 30 also includes a sealing cap 33, which covers the side of the second seal 31 away from the first seal 20. The sealing cap 33 and the pressure measuring assembly 40 are sealed together. The sealing cap 33 is a cover that can cover the support 32 after the glue has been applied. The sealing cap 33 may also have an opening that allows the air guide 41 to extend out and connect with the pressure measuring assembly 42. The air guide 41 and the sealing cap 33 can be sealed together with glue.

[0060] The air pressure measurement is sealed by the first seal 20, the second seal 31, and the support 32. Using a smaller measuring element 42 reduces the force of the gas on the measurement system, resulting in a more reliable seal. This design is suitable not only for testing but also for actual products.

[0061] The cover assembly 100 can be used in situations where it is necessary to measure the air pressure inside the cavity, such as the air pressure inside the box, the air pressure inside the battery pack, and the air pressure inside the battery cell.

[0062] Reference Figures 1-2 As shown, the battery 1000 according to a second aspect embodiment of the present invention includes: a housing 200, a battery cell, and a cover assembly 100. A receiving space 201 is formed inside the housing 200, the battery cell is disposed in the receiving space 201, and the cover assembly 100 covers the housing 200 and seals the receiving space 201.

[0063] Battery 1000 typically has an electrolyte inlet on the cover plate 10, used to inject electrolyte during cell production and sealed with a rubber stopper. Because the rubber stopper's sealing performance is generally poor, a cap is usually welded on to prevent leakage. Once the cell production is complete and the battery 1000 is put into use, the electrolyte inlet is no longer needed.

[0064] In this embodiment, the liquid injection port is used to monitor the air pressure of the battery 1000. That is, the opening on the cover plate 10 is the liquid injection port. The measuring element 42 passes through the rubber plug at the liquid injection port to measure the air pressure in the accommodating space 201. The cover plate assembly 100 has good air tightness and can be used to measure the air pressure of the battery cells in actual products.

[0065] Alternatively, the opening can be a separate opening on the battery 1000, eliminating the need to utilize the battery 1000's liquid filling port.

[0066] The battery pack according to a third aspect of the present invention includes at least two batteries 1000.

[0067] According to a fourth aspect of this utility model, the electrical equipment includes a battery pack. The electrical equipment can be a vehicle, an energy storage cabinet, etc.

[0068] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0070] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that, include: A cover plate having an opening; A first seal is provided over the opening to seal it; A sealing assembly is disposed on the side of the cover plate away from the battery cell, and the sealing assembly and the first sealing element are disposed opposite to each other; A pressure measuring component, which passes through the sealing component and the first seal and extends toward the battery cell.

2. The cover plate assembly according to claim 1, characterized in that, The air pressure measuring component includes a measuring element and an air guide element. One end of the measuring element and one end of the air guide element are connected to each other. The other end of the measuring element passes through the first sealing element and extends toward the battery cell. The other end of the air guide element is connected to the air pressure measuring element.

3. The cover plate assembly according to claim 2, characterized in that, The air guide component is equipped with a buffer medium.

4. The cover plate assembly according to claim 3, characterized in that, The air guide is provided with a backflow preventer, which is located between the buffer medium and the measuring element.

5. The cover plate assembly according to claim 2, characterized in that, The height of the first sealing element is h1, and the length of the measuring element is h2. h1 and h2 satisfy the relationship: 2mm≤h2-h1≤20mm.

6. The cover plate assembly according to claim 2, characterized in that, The diameter of the measuring element is d, and d satisfies the relationship: 0.5mm≤d≤4mm.

7. The cover plate assembly according to claim 2, characterized in that, One end of the air guide is provided with a first conical surface; and / or, One end of the measuring element is provided with a second conical surface.

8. The cover plate assembly according to claim 1, characterized in that, The sealing assembly includes: a second seal, which is disposed on the side of the cover plate away from the battery cell, and the second seal is wrapped around the outside of the air pressure measuring assembly. The second seal and the first seal are disposed opposite to each other.

9. The cover plate assembly according to claim 8, characterized in that, The sealing assembly further includes: a support member, the support member having a through hole, the second sealing member being disposed within the through hole, and one end of the support member being connected to the cover plate.

10. The cover plate assembly according to claim 9, characterized in that, The cover plate is provided with a clearance groove, and the outer periphery of the support member facing the cover plate is provided with an annular flange, which is disposed in the clearance groove.

11. The cover plate assembly according to claim 8, characterized in that, The second sealant is one or more of acrylic sealant, epoxy sealant and silicone sealant.

12. The cover plate assembly according to claim 8, characterized in that, The sealing assembly further includes a sealing cap, which is disposed on the side of the second seal away from the first seal, and the sealing cap and the pressure measuring assembly are sealed together.

13. A battery, characterized in that, include: A housing having an internal receiving space; A battery cell, wherein the battery cell is disposed within the receiving space; The cover assembly according to any one of claims 1-12, wherein the cover assembly covers the housing and seals the receiving space.

14. A battery pack, characterized in that, include: At least two of the batteries as described in claim 13.

15. An electrical appliance, characterized in that, include: The battery pack of claim 14.

Images