Battery cover plate and battery with same

Abstract

The utility model discloses a battery cover plate and a battery with the same, the battery cover plate comprises a cover plate body, an explosion-proof valve, a lower insulating part and a protective patch, the cover plate body is provided with an explosion-proof hole, and the explosion-proof valve is arranged in the explosion-proof hole; the lower insulating part is installed on the side, facing the pole group, of the cover plate, the surface, facing the cover plate, of the lower insulating part is sunken in the direction away from the cover plate to form an installation groove, a through hole opposite to the anti-explosion valve is formed in the bottom wall of the installation groove, and the through hole penetrates through the bottom wall in the thickness direction of the cover plate body; the protection patch is installed in the installation groove, and a communicating hole is formed in the protection patch and used for communicating the through hole with the explosion-proof hole. According to the battery cover plate disclosed by the embodiment of the utility model, not only can pressure release be ensured when the pole group is subjected to thermal runaway, but also the impact of electrolyte on the explosion-proof valve can be well avoided, the assembly difficulty is low, and the assembly efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic batteries, in particular to a battery cover and a battery having the same. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] In the related art, the main structures of the blade battery are: cover plate (integrated with pole, explosion-proof valve, upper plastic, lower plastic, injection hole), shell, pole group end plate, side plate, bare cell insulation sheet, pole group, etc. After the cover plate and shell are welded, a closed space with certain mechanical strength is formed to protect the pole group; the side plate and bare cell insulation sheet are welded and fixed to the outside of the pole group; in addition, the bare cell insulation sheet is melted and fixed to the plastic parts of the positive and negative pole cover plates, so that the pole group is well fixed in the shell to avoid short circuit of the pole group.

[0004] However, for the side of the explosion-proof valve facing the battery cell, a cavity is formed between the inner end plate of the battery cell and the explosion-proof valve, and the electrolyte will accumulate in the cavity; when the battery is shaken, the electrolyte will shake back and forth, continuously impacting the explosion-proof valve, which can easily cause the explosion-proof valve to be damaged and the battery cell to leak, or even the explosion-proof valve to open prematurely. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery cover, which can not only ensure pressure relief when a pole group has thermal runaway, but also better prevent the electrolyte from impacting the explosion-proof valve, and has low assembly difficulty and high assembly efficiency.

[0006] According to an embodiment of the utility model, the battery cover plate includes: a cover plate body, the cover plate body is provided with an explosion-proof hole, and an explosion-proof valve, the explosion-proof valve is installed in the explosion-proof hole; a lower insulating member, the lower insulating member is installed on the side of the cover plate facing the pole group, the surface of the lower insulating member facing the cover plate is recessed in the direction away from the cover plate to construct a mounting groove, the bottom wall of the mounting groove is provided with a through hole opposite to the explosion-proof valve, the through hole passes through the bottom wall along the thickness direction of the cover plate body; a protective patch, the protective patch is installed in the mounting groove, the protective patch is provided with a connecting hole, and the connecting hole is used to connect the through hole with the explosion-proof hole.

[0007] According to the battery cover plate of the embodiment of the utility model, by providing a protective patch, it is possible not only to ensure pressure relief when thermal runaway occurs in the electrode group, but also to better prevent the electrolyte from impacting the explosion-proof valve, thereby effectively protecting the explosion-proof valve and increasing the service life of the battery. In addition, the battery cover plate, the explosion-proof valve and the protective patch of the present application are respectively installed on the cover plate body and the lower insulating member, which can reduce the difficulty of assembly and improve the efficiency of assembly.

[0008] In addition, the battery cover according to the utility model may also have the following additional technical features:

[0009] In some embodiments of the present invention, the communication hole comprises a slit penetrating the bottom wall along the thickness direction of the cover plate body.

[0010] In some embodiments of the present invention, the slit is arranged in the middle of the protective patch, and / or the slit is arranged on the outer periphery of the protective patch.

[0011] In some embodiments of the present invention, there are two slits arranged on the outer peripheral edge of the protective patch, and the two slits extend from both ends of the protective patch in the length direction toward the middle and are spaced apart.

[0012] In some embodiments of the present invention, the slit extends along a straight line.

[0013] In some embodiments of the utility model, the slit on the protective patch is constructed by an integrally formed part of the protective patch, and the slit has a predetermined slit width, or the slit is constructed by cutting the protective patch so that the slit has a closed state and an open state that is opened under a predetermined pressure.

[0014] In some embodiments of the present invention, the protective patch is in contact with the bottom wall.

[0015] In some embodiments of the present invention, in the projection plane of the straight line perpendicular to the thickness direction of the cover body, the projection plane of the explosion-proof hole and the projection plane of the through hole are both located within the projection plane of the mounting groove, and the projection surface area of ​​the explosion-proof hole and the projection surface area of ​​the through hole are both smaller than the projection surface area of ​​the mounting groove.

[0016] In some embodiments of the present invention, the thickness t of the protective patch satisfies: 0.03mm≤t≤0.3mm.

[0017] The utility model also provides a battery having the battery cover of the above embodiment.

[0018] The battery according to the embodiment of the utility model comprises: a shell and a pole group installed in the shell, the shell comprises a battery shell and a battery cover, the battery shell has an opening facing one side; the battery cover is arranged at the opening to close the opening.

[0019] According to the battery of the embodiment of the utility model, by providing the battery cover of the above embodiment, not only can the impact of the electrolyte on the explosion-proof valve be reduced, but also the high-temperature and high-pressure gas can be discharged better when thermal runaway occurs in the electrode group, and the structure is simple and the production cost is low.

[0020] 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

[0021] 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:

[0022] Figure 1 It is an exploded view of a battery cover according to an embodiment of the utility model.

[0023] Figure 2 A schematic structural diagram of a protective patch according to an embodiment of a battery cover plate of the utility model.

[0024] Figure 3 A schematic structural diagram of a battery cover according to an embodiment of the utility model.

[0025] Figure 4 yes Figure 3 Sectional view along line AA.

[0026] Figure 5 yes Figure 4 Magnified view of area B.

[0027] Reference numerals:

[0028] Battery cover 10,

[0029] Cover body 1, explosion-proof hole 11,

[0030] Explosion-proof valve 2,

[0031] Lower insulating member 3, mounting groove 31, bottom wall 311, through hole 32,

[0032] Protective patch 4, slit 41. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0035] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] Reference below Figure 1-Figure 5 A battery cover 10 according to an embodiment of the present invention is described.

[0037] According to the embodiment of the utility model, the battery cover 10 includes a cover body 1, an explosion-proof valve 2, a lower insulating member 3 and a protective patch 4. The cover body 1 is provided with an explosion-proof hole 11 and an explosion-proof valve 2. The explosion-proof valve 2 is installed in the explosion-proof hole 11. When the pole group in the battery has a thermal runaway problem, the explosion-proof valve 2 can be opened, thereby reducing the risk of thermal runaway of the pole group.

[0038] refer to Figure 1 As shown, a lower insulating member 3 is provided on the side of the cover body 1 facing the electrode group. The lower insulating member 3 can be made of insulating material, such as plastic. In addition, the lower insulating member 3 can also play a role in positioning the battery cover when the battery cover and the battery shell are matched.

[0039] Furthermore, after the battery cover closes the battery shell, the shell formed by the battery cover and the battery shell can be filled with electrolyte. When the battery is shaken, the electrolyte in the shell will shake back and forth, which is easy to impact the explosion-proof valve 2. If the shell continues to shake, the electrolyte will continue to impact the explosion-proof valve 2, which is easy to damage the explosion-proof valve 2 and even cause electrolyte leakage. In addition, if the impact force of the electrolyte on the explosion-proof valve 2 is large, it is also easy to cause the explosion-proof valve 2 to be opened, thereby affecting the service life of the battery. Based on this, the present application is provided with a protective patch 4 on the side of the explosion-proof valve 2 facing the pole group. The protective patch 4 can reduce the impact of the electrolyte on the explosion-proof valve 2, thereby protecting the explosion-proof valve 2.

[0040] Reference below Figure 1-Figure 5 As shown, the protective patch 4 is described in detail:

[0041] In one example of the utility model, the surface of the lower insulating member 3 facing the cover plate is recessed in a direction away from the cover plate to construct a mounting groove 31, and a through hole 32 opposite to the explosion-proof valve 2 is provided on the bottom wall 311 of the mounting groove 31, and the through hole 32 passes through the bottom wall 311 along the thickness direction of the cover plate body 1, and the protective patch 4 is installed in the mounting groove 31, and a connecting hole 32 is provided on the protective patch 4, and the connecting hole 32 is used to connect the through hole 32 with the explosion-proof hole 11.

[0042] That is to say, the explosion-proof valve 2 and the protective patch 4 can be installed on different structures respectively, that is, the explosion-proof valve 2 is installed on the battery cover 10, and the protective patch 4 is installed on the lower insulating member 3. By installing the explosion-proof valve 2 and the protective patch 4 on different structures respectively, the difficulty of assembly can be reduced and the assembly efficiency can be improved. In addition, when the electrolyte is filled into the shell, the electrolyte can enter between the protective patch 4 and the explosion-proof valve 2 through the through hole 32 and the connecting hole 32 on the protective patch 4. In this way, when the battery is shaken, since the electrolyte has been filled between the protective patch 4 and the explosion-proof valve 2, the electrolyte filled between the protective patch 4 and the explosion-proof valve 2 is not easy to flow away with the shaking of the battery, so that when the electrolyte in the battery impacts the explosion-proof valve 2, the impact force can be better buffered by the electrolyte between the protective patch 4 and the explosion-proof valve 2, thereby avoiding the electrolyte from impacting the explosion-proof valve 2, and then effectively protecting the explosion-proof valve 2.

[0043] When thermal runaway occurs in the electrode group, the high-temperature and high-pressure gas can still pass through the through hole 32 and the connecting hole 33 normally, and then act on the explosion-proof valve 2, so that the explosion-proof valve 2 opens to release pressure, thereby avoiding the battery from exploding due to thermal runaway of the electrode group, and effectively protecting the battery.

[0044] Therefore, according to the battery cover 10 of the embodiment of the utility model, by setting the protective patch 4, it is possible not only to ensure pressure relief when thermal runaway occurs in the electrode group, but also to better avoid the impact of the electrolyte on the explosion-proof valve 2, thereby effectively protecting the explosion-proof valve 2 and improving the service life of the battery. In addition, the battery cover 10, the explosion-proof valve 2 and the protective patch 4 of the present application are respectively installed on the cover body 1 and the lower insulating member 3, which can reduce the difficulty of assembly and improve the assembly efficiency.

[0045] In some embodiments of the present invention, the communication hole 32 includes a slit 41 that penetrates the bottom wall along the thickness direction of the cover body. Figure 1 and Figure 2 In the example shown, the slit 41 is a narrow and long slender window. With such a configuration, when the electrolyte impacts the explosion-proof valve 2, the protective patch 4 can block the impact force of the explosion-proof valve 2, while part of the electrolyte can penetrate into the space between the explosion-proof valve 2 and the protective patch 4 through the slit 41. Moreover, the electrolyte that penetrates into the space between the explosion-proof valve 2 and the protective patch 4 can also buffer the subsequent electrolyte impacting the protective patch 4, thereby effectively protecting the explosion-proof valve 2. Figure 2 The middle slit 41 extends along the length direction of the protective patch 4. It is understandable that the slit 41 can also extend along the width direction of the protective patch 4, or along the direction of a diagonal line of the protective patch 4. There is no limitation on the extension direction of the slit 41.

[0046] In addition, compared with the circular hole, the elongated slit 41 has a larger extension range. When the pole group has thermal runaway, the elongated slit 41 can facilitate the gas to quickly pass through the slit 41, thereby facilitating the pressure relief of the pole group.

[0047] In some embodiments of the present invention, the slit 41 is arranged in the middle of the protective patch 4, and / or the slit 41 is arranged at the outer periphery of the protective patch 4. In other words, the slit 41 can be arranged in the middle of the protective patch 4, or at the outer periphery of the protective patch 4, which can be arranged according to actual needs and is not limited here.

[0048] In a specific example, if Figure 2 As shown, there is one slit 41 located in the middle of the protective patch 4. The slit 41 extends along the length direction of the protective patch 4 and can be set to be relatively long, which is not only beneficial for buffering the electrolyte but also beneficial for battery pressure relief.

[0049] In a specific example, if Figure 1As shown, there are two slits 41 arranged on the outer peripheral edge of the protective patch 4, and the two slits 41 extend from the two ends of the length direction of the protective patch 4 toward the middle part, and are spaced apart. Therefore, when the electrolyte impacts the explosion-proof valve 2, the electrolyte toward the middle area of ​​the explosion-proof valve 2 can be blocked by the protective patch 4, and only part of the electrolyte can penetrate from the slits 41 at the two ends of the length direction of the protective patch 4, and this part of the penetrated electrolyte is not easy to impact the explosion-proof valve 2, so as to protect the explosion-proof valve 2 more effectively.

[0050] Optionally, the lengths of the two slits 41 may be equal or unequal. In addition, the shapes of the two slits 41 may be the same or different, which is not limited here.

[0051] In some embodiments of the present invention, the slit 41 extends along a straight line. It is understandable that the slit 41 may also be curved. The present application can reduce the processing difficulty and thus the production cost by making the slit 41 extend along a straight line.

[0052] In one example of the present invention, the slit 41 on the protective patch 4 is constructed by an integrally formed part of the protective patch 4, and the slit 41 has a predetermined slit width. Optionally, the protective patch 4 can be constructed by injection molding. In order to form the slit 41 on the protective patch 4 after integral injection molding, an insert can be set in the injection mold. After the injection molding is completed, the insert can be removed to construct the slit 41. The structure is simple and the operation is convenient. Of course, it is understandable that the protective patch 4 can also be constructed by other processing methods, which are not limited here.

[0053] In another example of the utility model, the slit 41 is cut by the protective patch 4 to form a closed state and an open state that is opened under a predetermined pressure. Optionally, the protective patch 4 can be cut by a blade or other structure to form the slit 41 after injection molding. When there is no force acting on the slit 41, the slit 41 can remain in a closed state. In this way, when the electrolyte impacts the protective patch 4, it is more difficult for the electrolyte to pass through the slit 41 in the closed state than the slit 41 with a predetermined slit width. In addition, the protective patch 4 of this structure does not need to use an insert during injection molding, which can reduce the cost of the mold.

[0054] In some embodiments of the present invention, the protective patch 4 is fitted with the bottom wall 311, so that the protective patch 4 can be better assembled. For example, the protective patch 4 can be adhered to the bottom wall 311 by bonding, thereby simplifying the assembly, improving the assembly efficiency and reducing the assembly cost.

[0055] In some embodiments of the present invention, the protective patch 4 can be made of PC, PET or other soft and corrosion-resistant materials.

[0056] In some embodiments of the utility model, in the projection plane perpendicular to the straight line where the thickness direction of the cover plate body 1 is located, the projection plane of the explosion-proof hole 11 and the projection plane of the through hole 32 are both located in the projection plane of the installation groove 31, and the projection plane area of ​​the explosion-proof hole 11 and the projection plane area of ​​the through hole 32 are both smaller than the projection plane area of ​​the installation groove 31. Optionally, the projection plane area of ​​the explosion-proof hole 11 can be equal to the projection plane area of ​​the through hole 32, so that when the pole group has thermal runaway, the lower insulating member 3 can be prevented from generating a large obstruction to the high-temperature and high-pressure gas, and the high-temperature and high-pressure gas can flow better from the through hole 32 toward the explosion-proof hole 11, which can be conducive to the high-temperature and high-pressure gas to better impact the explosion-proof valve 2, so that the explosion-proof valve 2 can be better opened.

[0057] Optionally, the thickness t of the protective patch 4 satisfies: 0.03mm≤t≤0.3mm. Optionally, the thickness of the protective patch 4 can be: 0.03mm, 0.04mm, 0.05mm, 0.08mm, 1.1mm, 1.5mm, 1.8mm, 0.3mm, etc., which are not limited here. By making the thickness of the protective patch 4 within the above-mentioned size range, the protective patch 4 can better block the electrolyte when it is impacted by the electrolyte, and can better deform when it is impacted by the high-temperature and high-pressure gas. For example, when the connecting hole 32 is a slit 41, the opening size of the slit 41 can also be better increased, thereby facilitating the discharge of the high-temperature and high-pressure gas.

[0058] The utility model also provides a battery having the battery cover 10 of the above embodiment.

[0059] The battery according to the embodiment of the utility model comprises: a shell and a pole group installed in the shell, the shell comprises a battery shell and a battery cover 10, the battery shell has an opening facing one side; the battery cover 10 is covered at the opening to close the opening.

[0060] According to the battery of the embodiment of the utility model, by providing the battery cover 10 of the above embodiment, not only can the impact of the electrolyte on the explosion-proof valve 2 be reduced, but also the high-temperature and high-pressure gas can be discharged better when thermal runaway occurs in the pole group, and the structure is simple and the production cost is low.

[0061] Other structures and operations of the battery cover 10 and the battery according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0062] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] 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 battery cover, characterized in that: include: The cover body is provided with explosion-proof holes. An explosion-proof valve, the explosion-proof valve being installed in the explosion-proof hole; A lower insulating member, the lower insulating member is installed on a side of the cover plate facing the pole group, the surface of the lower insulating member facing the cover plate is recessed in a direction away from the cover plate to form a mounting groove, the bottom wall of the mounting groove is provided with a through hole opposite to the explosion-proof valve, and the through hole penetrates the bottom wall along the thickness direction of the cover plate body; A protective patch is installed in the installation groove, and a connecting hole is provided on the protective patch, and the connecting hole is used to connect the through hole with the explosion-proof hole.

2. The battery cover according to claim 1, characterized in that: The communication hole includes a slit penetrating the bottom wall along the thickness direction of the cover plate body.

3. The battery cover according to claim 2, characterized in that: The slit is arranged in the middle of the protective patch, and / or the slit is arranged at the outer periphery of the protective patch.

4. The battery cover according to claim 3, characterized in that: There are two slits arranged on the outer peripheral edge of the protective patch, and the two slits extend from both ends of the protective patch in the length direction toward the middle and are spaced apart.

5. The battery cover according to any one of claims 2 to 4, characterized in that: The slit extends along a straight line.

6. The battery cover according to claim 2, characterized in that: The slit on the protective patch is constructed by the integrally formed part of the protective patch, and the slit has a predetermined slit width, or the slit is cut by the protective patch to construct the slit so that the slit has a closed state and an open state that is opened under a predetermined pressure.

7. The battery cover according to claim 1, characterized in that: The protective patch is in contact with the bottom wall.

8. The battery cover according to claim 1, characterized in that: In the projection plane perpendicular to the straight line where the thickness direction of the cover body is located, the projection plane of the explosion-proof hole and the projection plane of the through hole are both located within the projection plane of the mounting groove, and the projection plane area of ​​the explosion-proof hole and the projection plane area of ​​the through hole are both smaller than the projection plane area of ​​the mounting groove.

9. The battery cover according to claim 1, characterized in that: The thickness t of the protective patch satisfies: 0.03mm≤t≤0.3mm.

10. A battery, characterized in that: include: A housing and a pole group installed in the housing, wherein the housing comprises a battery housing and a battery cover, and the battery housing has an opening toward one side; The battery cover is the battery cover according to any one of claims 1 to 9, and the battery cover is arranged at the opening to close the opening.

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