Cover plate assembly, battery and electric equipment

Abstract

The utility model discloses a cover plate assembly, a battery and electric equipment, the cover plate assembly comprises: a cover plate, which is provided with an explosion-proof hole; the anti-explosion valve is arranged on one side of the anti-explosion hole and shields the whole anti-explosion hole; and the protection piece is arranged on the other side of the anti-explosion hole and covers the anti-explosion valve, the protection piece is connected with the peripheral side of the anti-explosion hole, and the protection piece is communicated with a battery cell and the anti-explosion valve. The protection piece is arranged on the peripheral side of the explosion-proof hole, so that smoothness of the explosion-proof hole is ensured, smooth pressure relief of the battery when the battery is out of control is ensured, and the safety of the battery is improved; the protection piece can improve the overall structural strength of the cover plate, and mistaken explosion of the anti-explosion valve under the action of mechanical external force is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a cover plate assembly, a battery and an electrical device. Background Art

[0002] Batteries are the most common energy carriers in various fields. With the widespread application of batteries, battery safety issues are receiving more and more attention. The most common and most serious safety issue of batteries is spontaneous combustion. After spontaneous combustion, due to the obstruction of the heavy outer shell of the battery, the internal heat cannot be quickly vented, making it easy to explode. The explosion-proof device is an important pressure relief structural component of the battery cover assembly. When the internal air pressure of the battery exceeds the threshold, the gas rushes out from the explosion-proof hole, and the explosion-proof valve ruptures from the weak part, thereby discharging the gas in time to avoid battery explosion.

[0003] In the related art, when the internal pressure of the battery needs to be released, the explosion-proof vent may be blocked by particulate matter or some side reaction products, so that the gas cannot break open the explosion-proof valve in time, causing danger. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a cover plate assembly, which ensures the smoothness of the explosion-proof hole by arranging a protective piece in the explosion-proof hole, thereby ensuring smooth pressure release of the battery when out of control occurs, and improving the safety of the battery.

[0005] According to the cover plate assembly of the first aspect of the utility model, it includes: a cover plate, which is provided with an explosion-proof hole; an explosion-proof valve, which is arranged on one side of the explosion-proof hole and covers the entire explosion-proof hole; a protective member, which is arranged on the other side of the explosion-proof hole and covers the explosion-proof valve, the protective member is connected to the peripheral side of the explosion-proof hole, and the protective member connects the battery cell and the explosion-proof valve.

[0006] According to the cover plate assembly of the embodiment of the utility model, a protective member is arranged on the side of the explosion-proof hole to ensure the unobstructed flow of the explosion-proof hole, thereby ensuring smooth pressure release of the battery when out of control occurs, thereby improving the safety of the battery; the protective member can improve the overall structural strength of the cover plate, and effectively prevent the explosion-proof valve from accidentally exploding under the action of external mechanical force.

[0007] According to some embodiments of the present utility model, the protective member is a cylinder and the upper end of the protective member is open, and the opening and the explosion-proof valve are arranged opposite to each other.

[0008] According to some embodiments of the present invention, a plurality of through holes arranged at intervals are provided on the side surface of the protective member.

[0009] According to some embodiments of the present invention, the aperture of the through hole is r, and r satisfies the relationship: 0.5 μm≤r≤3 μm.

[0010] According to some embodiments of the present invention, the protective element is made of insulating material.

[0011] According to some embodiments of the present invention, the shape of the explosion-proof valve includes but is not limited to a circle, a polygon or an ellipse.

[0012] According to some embodiments of the present invention, the protective member is welded or bonded to the cover plate.

[0013] According to some embodiments of the present utility model, a reinforcement piece is provided on the inner peripheral side of the explosion-proof hole, and an explosion-proof connecting piece is provided between the reinforcement piece and the explosion-proof valve.

[0014] The battery according to the second embodiment of the utility model comprises: a shell; a battery cell installed in the shell; and a cover plate assembly, wherein the cover plate assembly covers the shell.

[0015] The electrical equipment according to the embodiment of the third aspect of the utility model includes: the battery.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is an exploded view of a cover plate assembly according to an embodiment of the utility model;

[0019] Figure 2 is a side view of a cover plate assembly according to an embodiment of the utility model;

[0020] Figure 3 is a cross-sectional view of a cover plate assembly according to an embodiment of the utility model;

[0021] Figure 4 It is a top view of the cover plate assembly according to an embodiment of the utility model.

[0022] Reference numerals:

[0023] 10. Cover plate assembly; 11. Cover plate; 111. Explosion-proof hole; 112. Connecting hole; 12. Explosion-proof valve; 13. Protective member; 131. Opening; 132. Through hole. DETAILED DESCRIPTION

[0024] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0025] Reference below Figure 1-Figure 4 A cover plate assembly 10 according to an embodiment of the present invention is described, a battery including the cover plate assembly 10 is also proposed, and a vehicle including the battery is also proposed.

[0026] Notice: Figure 1-Figure 3 The up-down direction in the figure is the in-outside direction of the explosion-proof hole 111 , the upper side corresponds to the outer side of the explosion-proof hole 111 , and the lower side corresponds to the inner side of the explosion-proof hole 111 .

[0027] according to Figure 1-Figure 4 As shown, the cover plate assembly 10 includes: a cover plate 11, an explosion-proof valve 12 and a protective member 13. The cover plate assembly 10 is connected to the housing to form a receiving space for receiving the battery cell.

[0028] like Figure 1-Figure 3 As shown, the cover plate 11 is in the form of a thin sheet, and an explosion-proof hole 111 is opened on the cover plate 11. The explosion-proof hole 111 is set at the end of the cover plate 11, and the explosion-proof hole 111 runs through the height direction of the cover plate 11. The explosion-proof hole 111 connects the inside of the cover plate 11 and the outside of the cover plate 11. When the battery is out of control, when the air pressure inside the accommodation space exceeds the threshold, the airflow rushes out from the explosion-proof hole 111, so as to discharge the airflow in time and avoid battery explosion.

[0029] The cover plate assembly 10 also includes: a pole, a connection hole 112 is also opened in the middle of the cover plate 11, and the pole is arranged in the connection hole 112. The pole is connected to the connection hole 112 through a pole connector, and the pole connector is connected to the peripheral side of the connection hole 112, and the pole connector protrudes from the upper surface of the cover plate 11. The pole is bonded to the protruding pole connector, and the upper surface of the pole protrudes from the pole connector to facilitate the electrical connection between the pole and the outside, and the pole connector can protect the protruding pole and improve the stability of the pole.

[0030] like Figure 1 and Figure 2 As shown, the explosion-proof valve 12 is arranged on one side of the explosion-proof hole 111, and the explosion-proof valve 12 blocks the entire explosion-proof hole 111. Specifically, the explosion-proof valve 12 is arranged on the side of the explosion-proof hole 111 away from the shell, that is, the explosion-proof valve 12 is arranged on the outside of the explosion-proof hole 111. The explosion-proof valve 12 is adapted to the explosion-proof hole 111, and the explosion-proof valve 12 is connected to the explosion-proof hole 111 so that the explosion-proof valve 12 blocks the entire explosion-proof hole 111. When the air pressure in the battery is normal, the explosion-proof valve 12 seals the explosion-proof hole 111 to prevent foreign matter from entering the battery from the explosion-proof hole 111; when the battery is out of control and the air pressure inside the battery exceeds the threshold, the airflow rushes out from the explosion-proof hole 111, and the airflow is discharged in time to prevent the battery from exploding.

[0031] Further, the protective member 13 is arranged on the other side of the explosion-proof hole 111, the protective member 13 covers the explosion-proof valve 12, the protective member 13 is connected to the peripheral side of the explosion-proof hole 111, and the protective member 13 connects the battery cell and the explosion-proof valve 12. Specifically, the protective member 13 is arranged on the side of the explosion-proof hole 111 facing the inside of the shell, the protective member 13 and the explosion-proof valve 12 are arranged opposite to each other, and the protective member 13 is connected to the side where the cover plate 11 and the shell are connected, that is, the protective member 13 is connected to the inner side of the cover plate 11, and the protective member 13 is connected to the peripheral side of the inner side of the explosion-proof hole 111, so that the protective member 13 covers the explosion-proof valve 12, and the protective member 13 connects the battery cell and the explosion-proof valve 12. When the battery is out of control and leaks, the electrolyte or gas pressure in the battery cell can flow from the protective member 13 to the explosion-proof valve 12.

[0032] The explosion-proof hole 111 is easily blocked by particulate matter or side reaction products, resulting in poor pressure relief, explosion-proof failure, and affecting the safety performance and reliability of the battery. In the utility model, a protective member 13 is arranged around the explosion-proof hole 111. The protective member 13 can prevent the explosion-proof hole 111 from being blocked by particulate matter or side reaction products, ensure the smooth flow of the explosion-proof hole 111, and ensure the smooth pressure relief of the battery when it is out of control. The safety of the battery is improved; the protective member 13 can also improve the overall structural strength of the cover plate 11, and effectively prevent the explosion-proof valve 12 from accidentally exploding under the action of mechanical external force.

[0033] Therefore, by setting a protective member 13 around the explosion-proof hole 111, the explosion-proof hole 111 is ensured to be unobstructed, thereby ensuring smooth pressure relief of the battery when out of control occurs, thereby improving the safety of the battery; the protective member 13 can improve the overall structural strength of the cover plate 11, and effectively prevent the explosion-proof valve 12 from accidentally exploding under the action of external mechanical force.

[0034] according to Figure 1-Figure 3 As shown, the protective member 13 is a cylinder, and the upper end of the protective member 13 has an opening 131, and the opening 131 is arranged opposite to the explosion-proof valve 12. Specifically, the protective member 13 is a hollow cylinder, and the side where the protective member 13 is connected to the cover plate 11 has an opening 131, that is, the upper end of the protective member 13 has an opening 131, and the opening 131 corresponds to the explosion-proof hole 111, so that the airflow or the electrolyte in the battery cell can flow through the opening 131 to the explosion-proof valve 12, and finally flow to the outside.

[0035] In some embodiments, the protective member 13 is welded to the cover plate 11. Specifically, the peripheral side of the protective member 13 and the inner surface of the cover plate 11 can be fixedly connected by welding, which is easy to operate and has high connection strength.

[0036] In some embodiments, the protective member 13 is bonded to the cover plate 11. The peripheral side of the protective member 13 and the inner surface of the cover plate 11 can be fixedly connected by bonding, which is simple to operate, has high connection strength, and high installation efficiency.

[0037] Reference Figure 1-Figure 3 As shown, the side of the protective member 13 is provided with a plurality of through holes 132 arranged at intervals. Specifically, the shape of the through hole 132 includes but is not limited to a polygon, a circle or an ellipse, and can be selected and designed according to actual needs. The plurality of through holes 132 are arranged at intervals around the side of the cylinder, and the plurality of through holes 132 connect the inner side of the protective member 13 and the outer side of the protective member 13, so that the electrolyte or airflow flowing out of the battery cell can flow through the through holes 132 to the opening 131, and flow to the outside from the explosion-proof hole 111.

[0038] The explosion-proof hole 111 is easily blocked by larger particles or side reaction products, resulting in poor pressure relief, explosion-proof failure, and affecting the safety performance and reliability of the battery. In the utility model, a protective member 13 is arranged around the explosion-proof hole 111. The plurality of through holes 132 on the protective member 13 can prevent larger particles and side reaction products from flowing to the explosion-proof hole 111 and blocking the explosion-proof hole 111, thereby ensuring that the explosion-proof hole 111 is unblocked. This ensures that the battery can be smoothly depressurized when it loses control, thereby improving the safety of the battery.

[0039] In some embodiments, the bottom surface of the protective member 13 is connected to the side surface, and a through hole 132 may be provided on the bottom surface. The electrolyte or air flow out of the battery cell may flow from the through holes 132 on the bottom surface and the side surface to the opening 131 , and finally flow to the outside through the explosion-proof valve 12 .

[0040] In some embodiments, the bottom surface of the protective member 13 may not have holes, and the bottom surface is a complete plane, and the electrolyte or airflow flowing out of the battery cell only flows from the through hole 132 on the side to the opening 131, and finally flows to the outside. In addition, the side of the bottom surface facing away from the opening 131 is provided with an inward depression to buffer when the battery suddenly loses control and prevent the protective member 13 from breaking.

[0041] In some embodiments, the aperture of the through hole 132 is r, and r satisfies the relationship: 0.5 μm ≤ r ≤ 3 μm. Specifically, for a regular circular through hole 132, the aperture of the through hole 132 is consistent, and the aperture range is between 0.5 μm and 3 μm. For an irregularly shaped through hole 132, the aperture of the through hole 132 has a maximum value r1 and a minimum value r2, and the aperture of the through hole 132 is less than or equal to the maximum value r1 and greater than or equal to the minimum value r2.

[0042] Among them, r1≤3μm, r1 can be 2μm, 2.5μm, etc.

[0043] Furthermore, r2≥0.5μm, r2 can be 0.6μm, 0.7μm, etc.

[0044] In some embodiments, the protective member 13 is made of insulating material. Specifically, the material of the protective member 13 can be plastics such as PE (polyethylene), PP (polypropylene), PTFE (Poly tetrafluoroethylene), PA (Polyamide), PET (polyethylene glycolterephthalate), etc., or ceramics, aluminum, etc. The protective member 13 is made of insulating material to prevent the protective member 13 from chemically reacting with the electrolyte leaked from the battery cell.

[0045] In some other embodiments, a reinforcement is provided on the inner circumference of the explosion-proof hole 111, and an explosion-proof connector is provided between the reinforcement and the explosion-proof valve 12. In order to improve the connection strength of the explosion-proof valve 12 from the inside to the outside, a reinforcement may be provided on the circumference of the explosion-proof hole 111. An explosion-proof connector is provided between the reinforcement and the explosion-proof valve 12. The explosion-proof connector and the reinforcement enable the explosion-proof valve 12 to be connected to the surface of the cover plate 11, thereby improving the connection strength between the explosion-proof valve 12 and the cover plate 11.

[0046] The battery according to the second embodiment of the utility model includes: a shell, a battery cell and a cover assembly 10, the cover assembly 10 is covered on the shell, and the cover assembly 10 and the shell form a storage space for accommodating the battery cell. The battery cell is installed in the shell and connected to the cover 11. A protective member 13 is provided on the cover 11 at a position corresponding to the explosion-proof valve 12. The multiple through holes 132 on the protective member 13 can prevent larger particles and side reaction products from flowing to the explosion-proof hole 111 and blocking the explosion-proof hole 111, ensuring that the explosion-proof hole 111 is unobstructed and not blocked, thereby ensuring smooth pressure relief of the battery in the event of a loss of control. The safety of the battery is improved.

[0047] The electrical equipment according to the third embodiment of the utility model includes: a battery. A protective member 13 is provided on the cover plate 11 of the battery at a position corresponding to the explosion-proof valve 12. The plurality of through holes 132 on the protective member 13 can prevent larger particles and side reaction products from flowing to the explosion-proof hole 111 and blocking the explosion-proof hole 111, thereby ensuring that the explosion-proof hole 111 is unblocked and not blocked, thereby ensuring smooth pressure relief of the battery in the event of a loss of control. The safety of the battery is improved.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0050] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate (11), wherein the cover plate (11) is provided with an explosion-proof hole (111); An explosion-proof valve (12), the explosion-proof valve (12) being arranged on one side of the explosion-proof hole (111) and covering the entire explosion-proof hole (111); A protective member (13), the protective member (13) being arranged on the other side of the explosion-proof hole (111) and covering the explosion-proof valve (12), the protective member (13) being connected to the peripheral side of the explosion-proof hole (111), and the protective member (13) being in communication with the battery cell and the explosion-proof valve (12).

2. The cover plate assembly according to claim 1, characterized in that: The protective member (13) is a cylinder and has an opening (131) at the upper end of the protective member (13), and the opening (131) and the explosion-proof valve (12) are arranged opposite to each other.

3. The cover plate assembly according to claim 1, characterized in that: The side surface of the protective member (13) is provided with a plurality of through holes (132) arranged at intervals.

4. The cover plate assembly according to claim 3, characterized in that: The aperture of the through hole (132) is r, and r satisfies the relationship: 0.5 μm≤r≤3 μm.

5. The cover plate assembly according to claim 3, characterized in that: The protective member (13) is made of insulating material.

6. The cover plate assembly according to claim 3, characterized in that: The shape of the explosion-proof valve (12) includes but is not limited to a circle, a polygon or an ellipse.

7. The cover plate assembly according to claim 1, characterized in that: The protective member (13) is welded or bonded to the cover plate (11).

8. The cover plate assembly according to claim 1, characterized in that: A reinforcement piece is provided on the inner peripheral side of the explosion-proof hole (111), and an explosion-proof connecting piece is provided between the reinforcement piece and the explosion-proof valve (12).

9. A battery, characterized in that: include: case; A battery cell, wherein the battery cell is installed in the housing; The cover plate assembly (100) according to any one of claims 1 to 8, wherein the cover plate assembly (100) is covered on the shell.

10. An electrical device, characterized in that: include: The battery according to claim 9.

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