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 anti-explosion valve and a protective patch, an explosion-proof hole is formed in the cover plate body; the anti-explosion valve is mounted in the anti-explosion hole; the protection patch is installed on the side, facing the pole group, of the cover plate body, the protection patch and the anti-explosion valve are arranged in a spaced mode, and at least one notch is formed in the circumferential direction of the protection patch. By arranging the protective patch with the notch between the explosion-proof valve and the pole group, the impact of electrolyte on the explosion-proof valve can be weakened so as to protect the safety of the explosion-proof valve, and meanwhile, when the battery is in thermal runaway, high-temperature electrolyte and high-pressure gas in the battery can smoothly reach the explosion-proof valve through the notch in the protective patch, so that the safety of the battery is improved. And the air is discharged out of the battery through the anti-explosion valve, so that the safety of the battery is ensured.

Description

Technical Field

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

[0002] At present, the main structure of the battery includes a cover plate, a shell, an end plate, a side plate and a pole group, among which an explosion-proof valve is provided on the cover plate. A cavity is formed between the end plate and the explosion-proof valve of the battery, and the electrolyte in the battery will gather in the cavity. When the battery as a whole shakes, the electrolyte will shake back and forth in the battery, constantly impacting the explosion-proof valve, which can easily damage the explosion-proof valve, thereby causing battery leakage, premature opening of the explosion-proof valve, etc. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cover plate with good anti-impact performance and high safety performance.

[0004] According to the embodiment of the utility model, the battery cover comprises: a cover body, an explosion-proof valve and a protective patch; an explosion-proof hole is arranged on the cover body; the explosion-proof valve is installed in the explosion-proof hole; the protective patch is installed on the side of the cover body facing the pole group, the protective patch and the explosion-proof valve are spaced apart, wherein at least one notch is arranged on the circumference of the protective patch.

[0005] According to the battery cover of the embodiment of the utility model, by providing a protective patch with a notch between the explosion-proof valve and the electrode group, the impact of the electrolyte on the explosion-proof valve can be weakened to protect the safety of the explosion-proof valve. At the same time, when thermal runaway occurs in the battery, the high-temperature electrolyte and high-pressure gas inside the battery can smoothly reach the explosion-proof valve through the notch on the protective patch, and be discharged to the outside of the battery through the explosion-proof valve, thereby ensuring the safety of the battery.

[0006] In addition, the battery cover according to the utility model may also have the following additional technical features:

[0007] In some embodiments, the inner peripheral wall of the explosion-proof hole has a plurality of bosses protruding toward the center of the explosion-proof hole, and each of the bosses has a step surface facing one side of the pole group, wherein one of the plurality of step surfaces is a first step surface, and the explosion-proof valve is installed on the first step surface, and one of the plurality of step surfaces is a second step surface, and the protective patch is installed on the second step surface, and the first step surface is located on the side of the second step surface away from the pole group.

[0008] In some embodiments, a third step surface is further provided between the first step surface and the second step surface, and the side of the explosion-proof valve facing the pole group is coplanar with the third step surface.

[0009] In some embodiments, in the thickness direction of the cover plate body, a distance h between the second step surface and the third step surface satisfies: 0.2 mm ≤ h ≤ 1 mm.

[0010] In some embodiments, the explosion-proof valve includes an explosion-proof valve body and a mounting seat connected to the outer periphery of the explosion-proof valve body, and the mounting seat is fixedly connected to the first step surface.

[0011] In some embodiments, in a projection plane perpendicular to the thickness direction of the cover body, the projection of the explosion-proof valve body is located within the projection of the explosion-proof hole, the projection of the notch is located within the projection of the third step surface, or a portion of the projection of the notch is located within the projection of the first step surface, and another portion of the projection of the notch is located within the projection of the third step surface.

[0012] In some embodiments, the thickness c of the protective patch satisfies: 0.03 mm ≤ c ≤ 0.3 mm.

[0013] In some embodiments, the protective patch is an integrally molded plastic part.

[0014] In some embodiments, the battery cover further includes: a cover plate, wherein the cover plate is disposed on a side of the explosion-proof hole away from the electrode group.

[0015] The utility model also provides a battery having the above embodiment.

[0016] The battery according to the embodiment of the utility model comprises: a housing and a pole group installed in the housing, the housing comprises a battery housing and a battery cover, the battery housing has an opening facing one side; the battery cover is arranged at the opening to close the opening. By setting the battery cover of the above embodiment, the overall safety performance of the battery can be effectively improved.

[0017] 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

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

[0019] Figure 2 It is a front view of a battery cover plate (without the cover sheet) according to an embodiment of the utility model;

[0020] Figure 3 is based on Figure 1 Sectional view along line AA;

[0021] Figure 4 is based on Figure 3Enlarged view of area B;

[0022] Figure 5 is a side view of a protective patch of a battery cover according to an embodiment of the utility model;

[0023] Figure 6 It is a front view of the protective patch of the battery cover according to an embodiment of the utility model.

[0024] Reference numerals:

[0025] 100. Battery cover;

[0026] 1. Cover plate body; 11. Explosion-proof hole; 12. Boss; 121. First step surface; 122. Second step surface; 123. Third step surface;

[0027] 2. Explosion-proof valve; 21. Explosion-proof valve body; 22. Mounting seat;

[0028] 3. Protective patch; 31. Notch;

[0029] 4. Cover piece;

[0030] 5. Remove plastic. DETAILED DESCRIPTION

[0031] 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] 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.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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 "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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, an electrical connection, or a communication; 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 invention can be understood according to specific circumstances.

[0035] Reference below Figure 1-Figure 6 A battery cover 100 according to an embodiment of the present invention is described.

[0036] like Figures 1 to 6 As shown, the battery cover 100 according to the embodiment of the utility model includes: a cover body 1, an explosion-proof valve 2 and a protective patch 3; an explosion-proof hole 11 is provided on the cover body 1, and the explosion-proof valve 2 is installed in the explosion-proof hole 11; when the battery has thermal runaway, the pressure inside the battery rises sharply, and the high-pressure gas and high-temperature electrolyte inside the battery can be discharged to the outside of the battery in time through the explosion-proof valve 2 and the explosion-proof hole 11, so that the pressure inside the battery drops rapidly to prevent the battery from exploding.

[0037] refer to Figure 1 As shown, a lower plastic 5 is provided on the side of the cover body 1 facing the electrode group. The lower plastic 5 can be made of insulating material. In addition, the lower plastic 5 can also play a role in positioning the battery cover 100 when the battery cover 100 is matched with the battery shell.

[0038] Furthermore, after the battery cover 100 closes the battery shell, the shell constructed by the battery cover 100 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 also continue to impact the explosion-proof valve 2, which is easy to damage the explosion-proof valve 2 and even cause the electrolyte to leak. 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 3 on the side of the explosion-proof valve 2 facing the pole group. The protective patch 3 can reduce the impact of the electrolyte on the explosion-proof valve 2, thereby protecting the explosion-proof valve 2.

[0039] refer to Figure 1 and Figure 4 As shown, the protective patch 3 is installed on the side of the cover body 1 facing the electrode group, and the protective patch 3 and the explosion-proof valve 2 are spaced apart, wherein at least one notch 31 is provided in the circumferential direction of the protective patch 3. The protective patch 3 can protect the explosion-proof valve 2, reduce the impact of the electrolyte on the explosion-proof valve 2, and prevent the explosion-proof valve 2 from being damaged; the notch 31 on the protective patch 3 can ensure that when the battery has thermal runaway, the high-temperature electrolyte and high-pressure gas inside the battery can smoothly pass through the notch 31 to reach the explosion-proof valve 2, and be discharged to the outside of the battery through the explosion-proof valve 2 to protect the safety of the battery.

[0040] Furthermore, the provision of the notch 31 is also helpful to ensure the pressure balance of the space on both sides of the protection patch 3 , thereby preventing the explosion-proof valve 2 from being damaged by pressure imbalance.

[0041] According to the battery cover 100 of the embodiment of the utility model, by providing a protective patch 3 with a notch 31 between the explosion-proof valve 2 and the electrode group, the impact of the electrolyte on the explosion-proof valve 2 can be weakened to protect the safety of the explosion-proof valve 2. At the same time, when the battery has thermal runaway, the high-temperature electrolyte and high-pressure gas inside the battery can smoothly reach the explosion-proof valve 2 through the notch 31 on the protective patch 3, and be discharged to the outside of the battery through the explosion-proof valve 2, thereby ensuring the safety of the battery.

[0042] In one embodiment of the present invention, Figures 1 to 6 As shown, the inner peripheral wall of the explosion-proof hole 11 has a plurality of bosses 12 protruding toward the center of the explosion-proof hole 11, and each boss 12 has a step surface facing one side of the pole group, wherein one of the plurality of step surfaces is a first step surface 121, and the explosion-proof valve 2 is installed on the first step surface 121, and one of the plurality of step surfaces is a second step surface 122, and the protective patch 3 is installed on the second step surface 122, and the first step surface 121 is located on the side of the second step surface 122 away from the pole group.

[0043] In this embodiment, the setting of the first step surface 121 and the second step surface 122 can play a positioning role in the installation of the explosion-proof valve 2 and the protective patch 3, so as to facilitate the installation of the explosion-proof valve 2 and the protective patch 3. At the same time, the first step surface 121 and the second step surface 122 set apart can separate the explosion-proof valve 2 and the protective patch 3 to ensure that there is sufficient flow space between the explosion-proof valve 2 and the protective patch 3, so that the protective patch 3 can have enough space to deform and absorb energy, thereby protecting the safety of the explosion-proof valve 2.

[0044] refer to Figure 4As shown, there is a third step surface 123 between the first step surface 121 and the second step surface 122, and the side of the explosion-proof valve 2 facing the electrode group is coplanar with the third step surface 123, so that the neatness of assembly can be ensured. The boss 12 with the third step surface 123 separates the first step surface 121 and the second step surface 122 to prevent the explosion-proof valve 2 from contacting the protective patch 3;

[0045] In a specific embodiment of the present invention, Figures 1 to 6 As shown, in the thickness direction of the cover body 1 , the distance h between the second step surface 122 and the third step surface 123 satisfies: 0.2 mm≤h≤1 mm.

[0046] In this specific embodiment, when the distance h between the second step surface 122 and the third step surface 123 is less than 0.2 mm, the distance between the explosion-proof valve 2 and the protective patch 3 is too close, and the space between the explosion-proof valve 2 and the protective patch 3 is too small. When the electrolyte in the electrode group impacts the protective patch 3, the protective patch 3 does not have enough space for deformation buffering, and may even abut or collide with the explosion-proof valve 2, thereby failing to effectively protect the explosion-proof valve 2; when the distance h between the second step surface 122 and the third step surface 123 is greater than 1 mm, the distance between the explosion-proof valve 2 and the protective patch 3 is too far, and the space between the explosion-proof valve 2 and the protective patch 3 is too large, which not only increases the thickness of the cover body 1 and increases the space occupied by the cover body 1, but also causes space waste; when the distance h between the second step surface 122 and the third step surface 123 satisfies: 0.2 mm < h < 1 mm, the protective patch 3 not only has sufficient deformation buffer space, but also does not cause space waste.

[0047] In a specific embodiment of the present invention, Figures 1 to 6 As shown, the explosion-proof valve 2 includes an explosion-proof valve body 21 and a mounting seat 22 connected to the outer periphery of the explosion-proof valve body 21 , and the mounting seat 22 is fixedly connected to the first step surface 121 .

[0048] In this specific embodiment, the explosion-proof valve body 21 is the overall action area of ​​the explosion-proof valve 2. When the battery has thermal runaway, the explosion-proof valve body 21 is broken open so that the battery as a whole can be quickly depressurized. The mounting seat 22 is the mounting portion of the explosion-proof valve 2 so that the explosion-proof valve 2 can be installed in the explosion-proof hole 11.

[0049] In a specific embodiment of the present invention, Figures 1 to 6 As shown, in the projection plane perpendicular to the thickness direction of the cover body 1, the projection of the explosion-proof valve body 21 is located in the projection of the explosion-proof hole 11, the projection of the notch 31 is located in the projection of the third step surface 123, or the projection of a part of the notch 31 is located in the projection of the first step surface 121, and the projection of another part of the notch 31 is located in the projection of the third step surface 123.

[0050] Reference Figure 4 As shown, in the thickness direction of the cover body 1, part of the notch 31 on the protective patch 3 is opposite to the first step surface 121, and the other part is opposite to the third step surface 123. In this way, when the battery shakes and the electrolyte impacts the protective patch 3, part of the electrolyte flowing through the notch 31 can only impact the first step surface 121 and the third step surface 123, and will not cause impact on the explosion-proof valve body 21. This not only protects the safety of the explosion-proof valve body 21, but also ensures the normal circulation of electrolyte and gas.

[0051] In one embodiment of the present invention, Figures 1 to 6 As shown, the thickness c of the protective patch 3 satisfies: 0.03 mm ≤ c ≤ 0.3 mm.

[0052] In this embodiment, when the thickness c of the protective patch 3 is less than 0.03mm, the overall thickness of the protective patch 3 is too thin, and the overall structural strength is insufficient, and it cannot effectively withstand the impact of the electrolyte, thereby failing to effectively protect the safety of the explosion-proof valve 2; when the thickness c of the protective patch 3 is greater than 0.3mm, the overall thickness of the protective patch 3 is too thick, which not only increases the manufacturing cost, but also occupies more installation space, resulting in a double waste of space and manufacturing cost; when the thickness c of the protective patch 3 satisfies: 0.03mm<c<0.3mm, the protective patch 3 not only has sufficient structural strength, but also will not occupy too much installation space and increase too much manufacturing cost.

[0053] In a specific embodiment, the protective patch 3 is an integrally formed plastic part having good deformation energy absorption capability and corrosion resistance.

[0054] In one embodiment of the present invention, Figures 1 to 6 As shown, the battery cover plate 100 further includes: a cover plate 4, which is arranged on a side of the explosion-proof hole 11 away from the electrode group.

[0055] Reference Figure 1 As shown, the cover sheet 4 is covered on the explosion-proof hole 11 to close the explosion-proof hole 11 , so that the explosion-proof valve 2 can be prevented from being corroded by external rain or dust, thereby protecting the safety of the explosion-proof valve 2 .

[0056] The utility model also provides a battery having the above embodiment.

[0057] The battery according to the embodiment of the utility model comprises: a housing and a pole group installed in the housing, the housing comprises a battery housing and a battery cover 100, the battery housing has an opening facing one side; the battery cover 100 is covered at the opening to close the opening. By setting the battery cover 100 of the above embodiment, the overall safety performance of the battery can be effectively improved.

[0058] Other structures and operations of the battery cover 100 and the battery according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] 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: A cover plate body, wherein the cover plate body is provided with explosion-proof holes; An explosion-proof valve, the explosion-proof valve being installed in the explosion-proof hole; A protective patch is installed on the side of the cover plate body facing the pole group, the protective patch and the explosion-proof valve are spaced apart, wherein at least one notch is arranged on the circumference of the protective patch.

2. The battery cover according to claim 1, characterized in that: The inner peripheral wall of the explosion-proof hole has a plurality of bosses protruding toward the center of the explosion-proof hole, and each of the bosses has a step surface facing one side of the pole group. Among them, one of the multiple step surfaces is a first step surface, the explosion-proof valve is installed on the first step surface, one of the multiple step surfaces is a second step surface, the protective patch is installed on the second step surface, and the first step surface is located on the side of the second step surface away from the pole group.

3. The battery cover according to claim 2, characterized in that: A third step surface is further provided between the first step surface and the second step surface, and a side surface of the explosion-proof valve facing the electrode group is coplanar with the third step surface.

4. The battery cover according to claim 3, characterized in that: In the thickness direction of the cover plate body, a distance h between the second step surface and the third step surface satisfies: 0.2 mm≤h≤1 mm.

5. The battery cover according to claim 3, characterized in that: The explosion-proof valve comprises an explosion-proof valve body and a mounting seat connected to the outer periphery of the explosion-proof valve body, and the mounting seat is fixedly connected to the first step surface.

6. The battery cover according to claim 5, characterized in that: In the projection plane perpendicular to the thickness direction of the cover plate body, the projection of the explosion-proof valve body is located within the projection of the explosion-proof hole, the projection of the notch is located within the projection of the third step surface, or the projection of a part of the notch is located within the projection of the first step surface, and the projection of another part of the notch is located within the projection of the third step surface.

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

8. The battery cover according to claim 1, characterized in that: The protective patch is an integrally formed plastic part.

9. The battery cover according to claim 1, characterized in that: Also includes: A cover plate is provided on a side of the explosion-proof hole away from the pole group.

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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