Battery cover plate and battery

Abstract

The application provides a battery cover plate and a battery, comprising a cover plate body, the cover plate body comprising: a pole connecting part, which can be connected with a battery pole; and an explosion-proof valve connecting part, which comprises a first bending part and a second bending part, the first bending part being connected with the pole connecting part, the second bending part being connected with one end of the first bending part away from the pole connecting part, the pole connecting part and the second bending part being located on the same side of the first bending part or on both the inner and outer sides of the first bending part, and an explosion-proof valve mounting hole being arranged along the thickness direction of the second bending part. The battery cover plate provided by the application can reduce the risk of battery explosion and improve the safety performance of the battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cover and a battery. Background Technology

[0002] During battery production, an explosion-proof valve is installed on the battery cover. This valve can quickly release pressure when the internal pressure of the battery exceeds a set threshold, preventing an explosion caused by excessive internal pressure. Currently, in most rechargeable batteries, the explosion-proof valve and the terminal post are located close to each other on the same plane. When the explosion-proof valve opens, internal gas escapes and sprays onto the terminal post. Since the terminal post has a relatively high temperature, the escaped gas is flammable and explosive, and contact with the terminal post can easily cause a fire and explosion. Utility Model Content

[0003] In order to overcome the defects in the prior art, this utility model provides a battery cover and battery, which can reduce the risk of battery explosion and improve its safety performance.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] The first aspect of this utility model discloses a battery cover, including a cover body, the cover body comprising:

[0006] A terminal connection portion, which can be connected to a battery terminal;

[0007] An explosion-proof valve connection part includes a first bend and a second bend. The first bend is connected to the pole post connection part, and the second bend is connected to the end of the first bend part away from the pole post connection part. The pole post connection part and the second bend part are located on the same side or inside and outside the first bend part, and an explosion-proof valve mounting hole is provided along the thickness direction of the second bend part.

[0008] The battery cover of the above technical solution can separate the explosion-proof valve from the battery terminal by setting the explosion-proof valve mounting hole on the second bend. When the internal pressure of the battery rises to exceed the explosion threshold of the explosion-proof valve, the gas inside the battery escapes through the explosion-proof valve. Its escape direction is away from the battery terminal, which can prevent the gas from contacting the battery terminal, thereby reducing the direct injection of gas onto the battery terminal, reducing the risk of battery explosion, and improving its safety performance.

[0009] Furthermore, the first bending portion includes a connecting section and a transition section. A first end of the connecting section is connected to the electrode connection portion, and a second end of the connecting section opposite to the electrode connection portion is connected to the transition section. The second bending portion is connected to the end of the transition section opposite to the connecting section. The connecting section and the second bending portion are located on the same side of the transition section. By providing the connecting section and the transition section, the structural strength of the explosion-proof valve connection portion can be enhanced, making the entire battery cover more stable and reliable when subjected to changes in internal battery pressure, and reducing the risk of structural deformation or damage caused by pressure impact.

[0010] Furthermore, the transition section is arranged parallel to the terminal connection portion, and both the second bending portion and the connection section are perpendicular or substantially perpendicular to the transition section. This ensures that the structure of the battery cover matches the structure of the battery casing, creating a more regular airflow direction when gas escapes through the explosion-proof valve, further ensuring that the gas does not impact the battery terminals.

[0011] Furthermore, the height of the connecting section is greater than the height of the battery terminal protruding from the surface of the terminal connection portion. This height setting serves two purposes: firstly, when the internal pressure of the battery increases, even if gas is rapidly ejected from the explosion-proof valve, the gas is unlikely to directly impact the battery terminal because the connecting section is higher than the battery terminal, thus enhancing the protective effect of the battery cover on the battery terminal; secondly, it ensures that the connecting section will not obstruct the assembly and welding of the battery terminal during battery assembly.

[0012] Furthermore, the height difference between the connecting section and the height of the battery terminal protruding from the terminal connection surface is 1-3 mm. This avoids the explosion-proof valve connection being too high, which would reduce the utilization rate of the battery's internal space.

[0013] Furthermore, the cover plate body is formed from at least one metal plate by bending or welding.

[0014] Furthermore, the cover plate body is provided with a liquid injection hole, which is located on the pole connection or the explosion-proof valve connection. This makes the setting of the liquid injection hole more flexible and improves the convenience of liquid injection.

[0015] Furthermore, the width of the transition section is set to be at least greater than the diameter of the injection hole, so that the injection hole is located on the transition section.

[0016] Furthermore, it also includes an upper plastic and a lower plastic, which are respectively disposed on the inner and outer sides of the electrode connection portion. One end of the battery electrode is connected and fixed to the electrode connection portion through the upper plastic, and the lower plastic is located between the other end of the battery electrode and the electrode connection portion.

[0017] The second aspect of this utility model discloses a battery, including the battery cover plate described in any one of the first aspects.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] This application, by setting the explosion-proof valve mounting hole on the second bend, can separate the explosion-proof valve from the battery terminal. When the internal pressure of the battery rises to exceed the explosion threshold of the explosion-proof valve, the gas inside the battery escapes through the explosion-proof valve. Its escape direction is away from the battery terminal, which can prevent the gas from contacting the battery terminal, thereby reducing the direct injection of gas onto the battery terminal, reducing the risk of battery explosion, and improving its safety performance.

[0020] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural diagram of a cover plate body provided in an embodiment of the present utility model;

[0023] Figure 2 This is an exploded view of a battery cover provided in an embodiment of this utility model;

[0024] Figure 3 This is a structural diagram of a battery cover provided in an embodiment of the present utility model;

[0025] Figure 4 This is a structural diagram of a battery provided in an embodiment of the present invention.

[0026] The reference numerals in the above figures are as follows: 1. Pole post connection part; 2. Explosion-proof valve connection part; 201. First bend part; 2011. Connecting section; 2012. Transition section; 202. Second bend part; 203. Explosion-proof valve mounting hole; 3. Positive pole post; 4. Negative pole post; 5. Injection hole; 6. Explosion-proof valve; 7. Explosion-proof valve liner; 8. Upper plastic; 9. Lower plastic; 10. Housing. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In addition, the accompanying drawings of the present invention are only simple schematic illustrations and are not depictions based on actual dimensions, as stated in advance.

[0028] In this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "forward," "backward," "between," "nearer," and "farthest" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.

[0030] Reference Figures 1-3 This application provides a battery cover, which includes a cover body, a terminal connection part 1 and an explosion-proof valve connection part 2. The terminal connection part 1 can be connected to the battery terminal, and the explosion-proof valve connection part 2 can be connected to the explosion-proof valve 6, so that the explosion-proof valve 6 can be kept away from the battery terminal. When the explosion-proof valve 6 is opened, the flammable and explosive gas inside the battery will not come into contact with the battery terminal, thereby reducing the risk of battery explosion.

[0031] It should be noted that the shape of the battery cover in this application matches the shape of the battery it is connected to. For example, it can be used for square batteries, round batteries, or batteries of other shapes. This application does not specifically limit it. In this embodiment, the battery cover is described as being used for a square battery.

[0032] Specifically, such as Figure 1 As shown, the electrode connection part 1 has a rectangular plate-like structure, and the electrode connection part 1 is provided with two spaced electrode mounting holes, which are used to install the positive electrode 3 and the negative electrode 4, respectively.

[0033] In some embodiments, the explosion-proof valve connection portion 2 includes a first bent portion 201 and a second bent portion 202. The first bent portion 201 is connected to the pole post connection portion 1, and the second bent portion 202 is connected to the end of the first bent portion 201 opposite to the pole post connection portion 1. Both the first bent portion 201 and the second bent portion 202 are rectangular plate-shaped structures. The first bent portion 201 and the pole post connection portion 1 have a first included angle, and the second bent portion 202 and the first bent portion 201 have a second included angle. The second bent portion 202 and the pole post connection portion 1 are located on the inner and outer sides of the first bent portion 201. The first included angle and the second included angle can be the same or different, and the specific angle can be set according to the actual situation. This application does not make specific limitations here.

[0034] In this embodiment, the explosion-proof valve connection part 2 includes a first bending part 201 and a second bending part 202. The first bending part 201 includes a connecting section 2011 and a transition section 2012. The first end of the connecting section 2011 is connected to the pole post connection part 1, and the second end of the connecting section 2011 away from the pole post connection part 1 is connected to the transition section 2012. The second bending part 202 is connected to the end of the transition section 2012 away from the connecting section 2011. The connecting section 2011 and the second bending part 202 are located on the same side of the transition section 2011.

[0035] like Figure 1 As shown, the connecting section 2011, the transition section 2012, and the second bending section 202 are all rectangular plate structures. The transition section 2012 is arranged parallel to the pole post connecting section 1, and the connecting section 2011 and the second bending section 202 are both arranged perpendicular to the transition section 2012.

[0036] Optionally, the outline of the cross section at the corner where the connecting section 2011 connects to the pole post connecting part 1 and / or the outline of the cross section at the corner where the connecting section 2011 connects to the transition section 2012, as well as the outline of the cross section at the corner where the second bending part 202 connects to the transition section 2012, are all arc-shaped, thereby avoiding stress concentration and improving the overall structural strength of the battery cover.

[0037] In some embodiments, the second bend 202 and the connecting segment 2011 have the same height, both greater than the height of the battery terminal protruding from the surface of the terminal connection portion 1. Optionally, the difference between the height of the second bend 202 and the connecting segment 2011 and the height of the battery terminal protruding from the surface of the terminal connection portion 1 is 1 to 3 mm. For example, when the height of the battery terminal protruding from the surface of the terminal connection portion 1 is 4 to 7 mm, the height of the second bend 202 and the connecting segment 2011 is 5 to 10 mm.

[0038] In some embodiments, the second bending portion 202 and the connecting section 2011 have different heights. The height of the connecting section 2011 is greater than the height of the battery terminal protruding from the surface of the terminal connecting portion 1. The height of the second bending portion 202 is set according to the width of the explosion-proof valve 6 along the first direction, ensuring that the explosion-proof valve 6 can open quickly to release pressure. The first direction is the same as the height direction of the second bending portion 202.

[0039] An explosion-proof valve mounting hole 203 is provided through the second bend 202 along its thickness direction for mounting the explosion-proof valve 6 and the explosion-proof valve film 7. The explosion-proof valve mounting hole 203 can be a circular hole, a triangular hole, a regular polygonal hole, or an irregular polygonal hole. Since the explosion-proof valve mounting hole 203 is located on the second bend 202, and the second bend 202 is separated from the terminal connection part 1 by the connection part 2011, when the explosion-proof valve 6 is depressurized, the gas inside the battery will not come into contact with the battery terminal, thereby reducing the risk of battery explosion.

[0040] like Figure 1 and Figure 2 As shown, the cover plate body is also provided with a liquid injection hole 5, which can be located on the pole connection part 1 or the explosion-proof valve connection part 2.

[0041] In this embodiment, the injection hole 5 is provided on the transition section 2012 of the explosion-proof valve connection part 2, and the width of the transition section 2012 is set to be at least greater than the diameter of the injection hole 5.

[0042] The material of the cover plate body can be flexibly set according to the actual situation, such as plastic or metal. In some embodiments, the pole connecting part 1, the first bending part 201 and the second bending part 202 are formed by bending a metal plate, or by bending two or more metal plates and then welding them together.

[0043] In some embodiments, the pole connection portion 1, the first bending portion 201, and the second bending portion 202 are integrally formed by injection molding.

[0044] In this embodiment, the battery cover also includes an upper plastic 8 and a lower plastic 9. The upper plastic 8 and the lower plastic 9 are respectively disposed on the inner and outer sides of the electrode connection part 1 along its thickness direction. One end of the battery electrode is connected and fixed to the electrode connection part 1 through the upper plastic 8, and the lower plastic 9 is located between the other end of the battery electrode and the electrode connection part 1, facing the inside of the battery, for insulation.

[0045] It should be noted that the inner and outer sides mentioned in the embodiments of this application refer to the cover body relative to the battery casing. Specifically, the side of the cover body facing the inside of the casing is the inner side, and the side of the cover body away from the inside of the casing is the outer side.

[0046] like Figure 4As shown, this application embodiment also provides a battery, the battery including the battery cover plate described in any of the above embodiments, and also including a housing 10, the housing 10 having an opening, the battery cover plate being connected to the end of the housing 10 with the opening, the shape of the end of the housing 10 forming the opening matching the shape of the battery cover plate, that is, the first connection portion of the housing 10 connecting to the explosion-proof valve connection portion 2 is higher than the second connection portion of the housing 10 connecting to the terminal post connection portion 1, so that the battery cover plate can completely seal the housing 10.

[0047] It should be noted that the battery can be a square battery, a round battery, or a lithium-ion battery, lead-acid battery, nickel-metal hydride battery, etc., and this application does not make any specific limitation. Since the battery cover plate according to the embodiment of this application has the above-mentioned advantages, the battery according to this utility model also has the above-mentioned advantages, that is, when the battery is depressurized, it can effectively prevent the flammable and explosive gases inside the battery from contacting the battery terminals, which can reduce the risk of battery explosion and thus effectively improve battery safety.

[0048] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A battery cover, characterized in that, Includes a cover plate body, the cover plate body comprising: A terminal connection portion, which can be connected to a battery terminal; An explosion-proof valve connection part includes a first bend and a second bend. The first bend is connected to the pole post connection part, and the second bend is connected to the end of the first bend part away from the pole post connection part. The pole post connection part and the second bend part are located on the same side or inside and outside the first bend part, and an explosion-proof valve mounting hole is provided along the thickness direction of the second bend part.

2. A battery cover according to claim 1, characterized in that, The first bending portion includes a connecting section and a transition section. The first end of the connecting section is connected to the pole post connecting portion, and the second end of the connecting section away from the pole post connecting portion is connected to the transition section. The second bending portion is connected to the end of the transition section away from the connecting section, and the connecting section and the second bending portion are located on the same side of the transition section.

3. A battery cover according to claim 2, characterized in that, The transition section is arranged parallel to the pole post connection part, and the second bending part and the connection section are both perpendicular or approximately perpendicular to the transition section.

4. A battery cover according to claim 3, characterized in that, The height of the connecting section is greater than the height of the battery terminal protruding from the surface of the terminal connecting part.

5. A battery cover according to claim 4, characterized in that, The difference between the height of the connecting section and the height of the battery terminal protruding from the terminal connection surface is 1 to 3 mm.

6. A battery cover according to claim 1, characterized in that, The cover plate body is formed by bending or welding at least one metal plate.

7. A battery cover according to claim 1, characterized in that, The cover plate body is provided with a liquid injection hole, which is located on the pole connection part or the explosion-proof valve connection part.

8. A battery cover according to claim 7, characterized in that, The width of the transition section is set to be at least greater than the diameter of the injection hole, so that the injection hole is located on the transition section.

9. A battery cover according to claim 1, characterized in that, It also includes an upper plastic and a lower plastic, which are respectively disposed on the inner and outer sides of the electrode connection part. One end of the battery electrode is connected and fixed to the electrode connection part through the upper plastic, and the lower plastic is located between the other end of the battery electrode and the electrode connection part.

10. A battery, characterized in that, Includes the battery cover as described in any one of claims 1 to 9.

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