Battery cover plate

Abstract

The utility model discloses a battery cover plate which comprises a cover plate body provided with two first through holes; the cover plate lower plastic cement is arranged on the cover plate body, two second through holes are formed in the cover plate lower plastic cement, and the second through holes and the first through holes are coaxially arranged; the cathode post comprises a cathode lower post, cathode post upper plastic cement, a cathode post cover plate, a ceramic piece and a first ceramic ring, one end of the cathode lower post is attached to the cover plate lower plastic cement, the other end of the cathode lower post sequentially penetrates through the second through hole and the first through hole, the cathode post upper plastic cement is arranged on the cathode lower post in a sleeving mode, and the ceramic piece is arranged on the cathode post cover plate. The negative pole upper plastic cement is arranged on one side, opposite to the cover plate lower plastic cement, of the cover plate body, and the negative pole cover plate is arranged in the negative pole upper plastic cement. Therefore, the safety problems such as short circuit and combustion caused by the short circuit can be effectively avoided under the condition of high temperature or thermal runaway of the battery.

Description

Technical Field

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

[0002] Currently, most battery covers are made of metal, which has limited mechanical strength and heat resistance. When the battery cell is impacted or a short circuit causes thermal runaway, a large amount of heat will melt the plastic of the terminals and the plastic under the cover, causing the terminals, battery adapters and other connectors to come into direct contact with the cover, resulting in an external short circuit. This makes it difficult to meet the safety requirements of lithium batteries. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, one objective of this utility model is to provide a battery cover that can effectively prevent short circuits and related safety issues such as combustion caused by the battery under high temperature or thermal runaway conditions.

[0005] To achieve the above objectives, this utility model proposes a battery cover, comprising: a cover body having two first through holes; a cover lower plastic layer disposed on the cover body, having two second through holes coaxially arranged with the first through holes; and a negative electrode post comprising a negative lower electrode post, a negative electrode post upper plastic layer, a negative electrode post cover, a ceramic component, and a first ceramic ring, wherein one end of the negative lower electrode post is attached to the cover lower plastic layer, and the other end of the negative lower electrode post passes through... The device includes a second through hole and a first through hole. The plastic sleeve on the negative electrode post is fitted onto the lower negative electrode post, and the plastic sleeve on the negative electrode post is arranged on the side opposite to the lower cover plastic of the cover plate body. The negative electrode post cover plate is disposed in the plastic sleeve on the negative electrode post, and the negative electrode post cover plate is fitted onto the lower negative electrode post and welded to the lower negative electrode post. One end of the ceramic component is attached to the cover plate body, and the other end of the ceramic component passes through the plastic sleeve on the negative electrode post and supports the negative electrode post cover plate. The first ceramic ring is disposed between the lower cover plastic and the cover plate body.

[0006] This utility model's battery cover plate, by welding the negative electrode post cover plate to the lower negative electrode post, and having a ceramic component supporting the negative electrode post cover plate, indirectly supports the lower negative electrode post. The ceramic component, made of high-temperature resistant and corrosion-resistant ceramic, enhances the overall structural strength and heat resistance, reducing the risk of damage during impacts. Furthermore, even in the event of thermal runaway, after the plastic on the negative electrode post melts, the ceramic component continues to support the negative electrode post cover plate, limiting the position of the lower negative electrode post relative to the cover plate body and preventing short circuits that could lead to combustion or fire. The first ceramic ring separates the plastic under the cover plate from the cover plate body. Even after the plastic under the cover plate melts, the cover plate body continues to provide insulation and support, thus ensuring that the battery effectively avoids short circuits and related combustion issues under high-temperature or thermal runaway conditions.

[0007] In addition, the battery cover proposed in the application may also have the following additional technical features:

[0008] Specifically, the cover plate body is provided with two first grooves, and the two first grooves are respectively connected to the two first through holes one by one. The plastic on the negative electrode post is disposed in the first groove.

[0009] Specifically, the ceramic component is a ceramic column, and there are multiple ceramic columns.

[0010] Specifically, a first positioning groove is provided in the first groove, and a first limiting groove is provided at the position of the negative electrode post cover plate corresponding to the first positioning groove. One end of the ceramic post is inserted into the first limiting groove, and the other end of the ceramic post is inserted into the first positioning groove.

[0011] Specifically, the ceramic component is a second ceramic ring.

[0012] Specifically, a second positioning groove is provided in the first groove, and a second limiting groove is provided at the position of the negative electrode post cover plate corresponding to the second positioning groove. The second positioning groove and the second limiting groove are arranged around the negative electrode lower post. One side of the second ceramic ring is inserted into the second positioning groove, and the other side of the second ceramic ring is inserted into the second limiting groove.

[0013] Specifically, it also includes a positive electrode post, one end of which is attached to the plastic under the cover plate, and the other end of which is sequentially provided with a corresponding second through hole and a first through hole. The positive electrode post includes a lower positive electrode post, a positive electrode post cover plate, and upper plastic on the positive electrode post. The arrangement of the lower positive electrode post, the positive electrode post cover plate, and the upper plastic on the positive electrode post is the same as that of the lower negative electrode post, the negative electrode post cover plate, and the upper plastic on the cover plate body.

[0014] Specifically, the positive electrode post and the negative electrode post also include a sealing ring. The sealing ring is stepped and is sleeved on the outer wall of the lower positive electrode post or the lower negative electrode post. One end of the sealing ring is inserted into the first through hole and fits against the inner wall of the first through hole. The other end of the sealing ring is located in the second through hole and fits between the cover plate body and the lower plastic of the cover plate.

[0015] Specifically, the first ceramic ring is sleeved on the outer wall of the sealing ring near the lower plastic end of the cover plate.

[0016] Specifically, the ends of the positive lower electrode post and the negative lower electrode post that are away from the cover plate body are higher than the positive electrode post cover plate or the negative electrode post cover plate. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0018] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a battery cover according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the cover plate body according to an embodiment of the present utility model;

[0021] Figure 3 This is a cross-sectional view of a battery cover according to an embodiment of the present invention.

[0022] Figure 4 According to one embodiment of the present utility model Figure 3 A magnified structural diagram of area A in the middle.

[0023] As shown in the figure:

[0024] 1. Cover plate body; 10. First through hole; 11. First groove; 12. First positioning groove;

[0025] 2. Plastic under the cover plate; 20; Second through hole 20;

[0026] 3. Negative electrode post; 30. Lower negative electrode post; 31. Plastic on the negative electrode post; 32. Negative electrode post cover plate; 33. Ceramic component; 34. First ceramic ring; 35. Sealing ring; 320. First limiting groove;

[0027] 4. Positive terminal post; 40. Lower positive terminal post; 41. Positive terminal post cover plate; 42. Plastic on the positive terminal post. Detailed Implementation

[0028] To better understand the above-mentioned objectives, features, and advantages of this utility model, the solution of this utility model will be further described below. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.

[0030] The battery cover of an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the battery cover of this utility model embodiment may include a cover body 1, a cover plastic 2, a negative electrode post 3, and a positive electrode post 4.

[0032] The cover plate body 1 has two first through holes 10 for the negative electrode post 3 and the positive electrode post 4 to be installed.

[0033] It should be noted that the cover plate body 1 is also provided with an injection hole and an explosion-proof valve hole, and an explosion-proof valve is installed in the explosion-proof valve hole. The injection hole is used to allow electrolyte to be injected during the battery production process, while the explosion-proof valve is used to release the internal high-pressure gas when the internal pressure of the battery rises abnormally, so as to prevent the battery from exploding.

[0034] The plastic 2 under the cover plate is set on the cover plate body 1. Two second through holes 20 are opened on the plastic 2 under the cover plate. The second through holes 20 are arranged coaxially with the first through hole 10.

[0035] It should be noted that the plastic 2 under the cover is arranged near the battery cell side, which can effectively prevent electrolyte leakage and play a sealing role. The plastic 2 under the cover can be provided with a vent and an injection hole. The vent is used to release the internal high-pressure gas when the internal pressure of the battery rises abnormally. At the same time, the diameter of the second through hole 20 is larger than the diameter of the first through hole 10, which facilitates the subsequent installation of the sealing ring 35 and the first ceramic ring 34.

[0036] For reference Figure 3 and Figure 4 As shown, the negative electrode post 3 may include a lower negative electrode post 30, a plastic upper negative electrode post 31, a negative electrode post cover plate 32, a ceramic part 33, and a first ceramic ring 34.

[0037] Among them, the negative electrode lower electrode post 30 is stepped, with a structure of lower copper metal and upper aluminum metal. The junction of the two different metals is welded, which can reduce costs while ensuring good conductivity and corrosion resistance.

[0038] One end of the negative electrode lower terminal post 30 is attached to the plastic 2 under the cover plate. Because the negative electrode lower terminal post 30 is stepped, on the one hand, the stepped design increases the contact area between the negative electrode lower terminal post 30 and the plastic 2 under the cover plate, enhancing the connection stability between the two. At the same time, it can also form a tighter fit with the plastic under the cover plate, thereby further improving the sealing performance of the battery. On the other hand, it can also ensure good contact between the negative electrode lower terminal post 30 and other conductive components inside the battery (such as the battery cell), thereby reducing contact resistance and improving current transmission efficiency. At the same time, the stepped design also provides convenience for the assembly and positioning of the negative electrode lower terminal post 30.

[0039] The other end of the negative electrode lower post 30 is sequentially provided with a second through hole 20 and a first through hole 10. The negative electrode upper plastic 31 is sleeved on the negative electrode lower post 30, and the negative electrode upper plastic 31 is arranged on the side opposite to the cover plate body 1 and the cover plate lower plastic 2. The negative electrode post cover plate 32 is disposed in the negative electrode upper plastic 31, and the negative electrode post cover plate 32 is sleeved on the negative electrode lower post 30 and welded to the negative electrode lower post 30. One end of the ceramic part 33 is attached to the cover plate body 1, and the other end of the ceramic part 33 passes through the negative electrode upper plastic 31 and supports the negative electrode post cover plate 32. The first ceramic ring 34 is disposed between the cover plate lower plastic 2 and the cover plate body 1.

[0040] Since the negative electrode terminal cover plate 32 is welded to the negative electrode lower terminal 30, and the ceramic component 33 supports the negative electrode terminal cover plate 32, the ceramic component 33 indirectly supports the negative electrode lower terminal 30. The ceramic component 33 is made of high-temperature resistant and corrosion-resistant ceramic as the support structure, which can enhance the overall structural strength and heat resistance, reduce the damage during collision, and ensure that even after the plastic 31 on the negative electrode terminal melts due to heat in the event of thermal runaway of the battery, the ceramic component 33 can still support the negative electrode terminal cover plate 32, restrict the position of the negative electrode lower terminal 30 relative to the cover plate body 1, and prevent short circuits from causing combustion or fire. Therefore, the use of ceramic component 33 can not only effectively improve the heat resistance of the battery cover, but also significantly improve its mechanical strength and chemical corrosion resistance. The first ceramic ring 34 is used to separate the plastic under the cover 2 from the cover body 1. After the plastic under the cover 2 is heated and melted, it plays an insulating and supporting role for the cover body 1, thereby ensuring that the battery can effectively avoid short circuits and the resulting combustion and other safety problems under high temperature or thermal runaway conditions.

[0041] One end of the positive electrode post 4 is attached to the plastic 2 under the cover plate, and the other end of the positive electrode post 4 is sequentially provided with the corresponding second through hole 20 and first through hole 10.

[0042] Furthermore, such as Figure 1 and Figure 3 As shown, the positive electrode post 4 includes a lower positive electrode post 40, a positive electrode post cover plate 41, and a plastic part 42 on the positive electrode post. The arrangement of the lower positive electrode post 40, the positive electrode post cover plate 41, and the plastic part 42 on the positive electrode post is the same as that of the lower negative electrode post 30, the negative electrode post cover plate 32, and the plastic part 31 on the cover plate body 1. That is, the lower positive electrode post 40 is also provided with a second through hole 20 and a first through hole 10 in sequence, just like the lower negative electrode post 30. The positive electrode post cover plate 41 and the plastic part 42 on the positive electrode post are also arranged in the same way as the plastic part 31 and the negative electrode post cover plate 32 on the negative electrode post 30 and the cover plate body 1.

[0043] It should be noted that the significant difference between the positive terminal 4 and the negative terminal 3 is that the positive terminal 4 does not have a ceramic component 33 and a first ceramic ring 34. This is because the positive terminal 4 is connected to the battery casing via a resistor (PTC thermistor), making it difficult for a potential difference to arise between the positive terminal 4 and the battery casing. The resistance of the PTC thermistor changes with temperature, gradually increasing the resistance as the battery's external short-circuit time increases and the temperature rises, reducing the short-circuit current and avoiding thermal shock to the resistor caused by excessive heat, thus preventing arcing. Therefore, no additional ceramic insulation is needed to prevent arcing. Arson issues generally only occur between the negative terminal 3 and the cover plate body 1. Therefore, the ceramic component 33 and the first ceramic ring 34 only need to be configured in the negative terminal 3 and do not need to be repeated on the positive terminal 4. This design not only directly reduces the amount of material used and effectively lowers production costs, but also simplifies the assembly process by omitting the assembly step of the ceramic component 33 on the positive terminal 4, further shortening the overall assembly time.

[0044] It should be noted that the positive electrode lower electrode post 40 is made of aluminum metal in one piece, and the whole is stepped.

[0045] In one embodiment of this utility model, such as Figure 3 and Figure 4 As shown, the cover plate body 1 is provided with two first grooves 11, and the two first grooves 11 are respectively connected to the two first through holes 10. The plastic 31 on the negative electrode post is disposed in the first groove 11. The first groove 11 can not only realize the positioning and assembly of the plastic 31 on the negative electrode post during installation, but also increase the contact area between the plastic 31 on the negative electrode post and the plastic 31 on the negative electrode post, thereby improving the stability and reliability of the installation of the plastic 31 on the negative electrode post.

[0046] In one embodiment of this utility model, such as Figure 2 As shown, ceramic component 33 is a ceramic pillar, and there are multiple ceramic pillars. That is, the ceramic pillars are used to support the negative electrode terminal cover plate 32. The cross-section of the ceramic pillar can be circular, square, or other shapes. Multiple ceramic pillars can be evenly distributed in a circular or square shape around the lower negative electrode terminal 30. In terms of the number of ceramic pillars, it is recommended to have 4, 6, or 8 evenly distributed pillars. This configuration can effectively reduce production costs while ensuring sufficient support force and achieving the same support strength. At the same time, the structural design of the upper ceramic pillar and the lower first ceramic ring 34 facilitates processing and installation, and can also ensure that it plays an insulating support role after the battery experiences thermal runaway.

[0047] Furthermore, such as Figure 3 and Figure 4As shown, a first positioning groove 12 is provided in the first groove 11, and a first limiting groove 320 is provided at the position of the negative electrode post cover plate 32 corresponding to the first positioning groove 12. One end of the ceramic post is inserted into the first limiting groove 320, and the other end of the ceramic post is inserted into the first positioning groove 12. That is, by reserving the first positioning groove 12 and the first limiting groove 320, the installation and positioning of the ceramic post can be facilitated, and the installation efficiency of the ceramic post can be improved. At the same time, the ceramic post is limited by the first positioning groove 12 and the first limiting groove 320, thereby improving the stability of the ceramic post when supporting the negative electrode post cover plate 32.

[0048] In another embodiment of this utility model, the ceramic component 33 is a second ceramic ring (not shown in the figure), that is, by using the second ceramic ring to replace the ceramic post, it also serves to support the negative electrode post cover plate 32.

[0049] Furthermore, a second positioning groove (not shown in the figure) is provided in the first groove 11, and a second limiting groove (not shown in the figure) is provided at the position of the negative electrode post cover plate 32 corresponding to the second positioning groove. The second positioning groove and the second limiting groove are arranged around the negative electrode lower post 30. One side of the second ceramic ring is inserted into the second positioning groove, and the other side of the second ceramic ring is inserted into the second limiting groove. The second positioning groove and the second limiting groove can facilitate the installation and positioning of the second ceramic ring, improve the installation efficiency of the second ceramic ring, and at the same time, the second positioning groove and the second limiting groove can also limit the second ceramic ring, thereby improving the stability of the second ceramic ring when supporting the negative electrode post cover plate 32.

[0050] It should be noted that the second ceramic ring, which surrounds the negative electrode post 30, can divide the plastic 31 on the negative electrode post into two parts, namely the inner ring and the outer ring, and the second ceramic ring is located between the inner ring and the outer ring.

[0051] In one embodiment of this utility model, such as Figure 3 As shown, the positive electrode post 4 and the negative electrode post 3 also include a sealing ring 35. The sealing ring 35 is stepped and is fitted onto the outer wall of the lower positive electrode post 40 or the lower negative electrode post 30. One end of the sealing ring 35 is inserted into the first through hole 10 and fits against the inner wall of the first through hole 10. The other end of the sealing ring 35 is located in the second through hole 20 and fits between the cover plate body 1 and the plastic 2 under the cover plate. The stepped sealing ring 35, through its stepped fit design with the cover plate body 1, effectively prevents the penetration of electrolyte or other harmful substances, greatly improves the sealing performance of the battery assembly, and ensures the stability and safety of the internal environment of the battery. At the same time, the sealing ring 35 not only plays a sealing role, but also acts as a connector to strengthen the connection between the lower negative electrode post 30 or the lower positive electrode post 40 and the cover plate body 1, making the entire battery assembly more stable when subjected to external forces or vibrations and extending its service life.

[0052] In one embodiment of this utility model, such as Figure 3 and Figure 4 As shown, the first ceramic ring 34 is sleeved on the outer wall of the end of the sealing ring 35 near the lower plastic 2 of the cover plate, thus being misaligned with the sealing ring 35. This not only does not affect the installation of the sealing ring 35 and ensures the sealing performance of the cover plate body 1, but also allows the sealing ring 35 to be used to position and install the first ceramic ring 34, thereby improving the installation efficiency of the first ceramic ring 34.

[0053] In one embodiment of this utility model, such as Figure 3 As shown, the ends of the positive electrode lower post 40 and the negative electrode lower post 30 that are away from the cover plate body 1 are higher than the positive electrode post cover plate 41 or the negative electrode post cover plate 32. This facilitates the welding of the positive electrode lower post 40 to the positive electrode post cover plate 41 or the negative electrode lower post 30 to the negative electrode post cover plate 32, so as to avoid the surface roughness caused by welding, which would prevent the aluminum busbar from being properly welded later. At the same time, it increases the contact area between the aluminum busbar and the positive electrode post 4 or the negative electrode post 3 after welding. The positive electrode lower post 40 and the negative electrode lower post 30 can be 2-3mm higher than the plane of the positive electrode post cover plate 41 or the negative electrode post cover plate 32.

[0054] In summary, the battery cover of this application embodiment can effectively prevent short circuits and related safety issues such as combustion caused by the battery under high temperature or thermal runaway conditions.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cover, characterized in that, include: The cover plate body has two first through holes. The cover plate has a plastic lining underneath, which is disposed on the cover plate body. Two second through holes are formed on the plastic lining under the cover plate, and the second through holes are arranged coaxially with the first through hole. The negative electrode post includes a lower negative electrode post, a plastic upper negative electrode post, a negative electrode post cover plate, a ceramic component, and a first ceramic ring. One end of the lower negative electrode post is attached to the plastic under the cover plate, and the other end of the lower negative electrode post is sequentially provided with a second through hole and a first through hole. The upper negative electrode post is fitted onto the lower negative electrode post, and the upper negative electrode post is arranged on the side of the cover plate body opposite to the plastic under the cover plate. The negative electrode post cover plate is disposed in the upper negative electrode post plastic, and the negative electrode post cover plate is fitted onto the lower negative electrode post and welded to the lower negative electrode post. One end of the ceramic component is attached to the cover plate body, and the other end of the ceramic component passes through the upper negative electrode post plastic and supports the negative electrode post cover plate. The first ceramic ring is disposed between the plastic under the cover plate and the cover plate body.

2. The battery cover according to claim 1, characterized in that, The cover plate body is provided with two first grooves, and the two first grooves are respectively connected to the two first through holes one by one. The plastic on the negative electrode post is placed in the first groove.

3. The battery cover according to claim 2, characterized in that, The ceramic component is a ceramic column, and there are multiple ceramic columns.

4. The battery cover according to claim 3, characterized in that, The first groove has a first positioning groove, and the negative electrode post cover plate has a first limiting groove at the position corresponding to the first positioning groove. One end of the ceramic post is inserted into the first limiting groove, and the other end of the ceramic post is inserted into the first positioning groove.

5. The battery cover according to claim 2, characterized in that, The ceramic component is a second ceramic ring.

6. The battery cover according to claim 5, characterized in that, The first groove has a second positioning groove, and the negative electrode post cover plate has a second limiting groove at the position corresponding to the second positioning groove. The second positioning groove and the second limiting groove are arranged around the negative electrode lower post. One side of the second ceramic ring is inserted into the second positioning groove, and the other side of the second ceramic ring is inserted into the second limiting groove.

7. The battery cover according to claim 1, characterized in that, It also includes a positive electrode post, one end of which is attached to the plastic under the cover plate, and the other end of which is sequentially provided with a corresponding second through hole and a first through hole. The positive electrode post includes a lower positive electrode post, a positive electrode post cover plate, and upper plastic on the positive electrode post. The arrangement of the lower positive electrode post, the positive electrode post cover plate, and the upper plastic on the positive electrode post is the same as that of the lower negative electrode post, the negative electrode post cover plate, and the upper plastic on the cover plate body.

8. The battery cover according to claim 7, characterized in that, The positive electrode post and the negative electrode post also include a sealing ring. The sealing ring is stepped and is sleeved on the outer wall of the lower positive electrode post or the lower negative electrode post. One end of the sealing ring is inserted into the first through hole and fits against the inner wall of the first through hole. The other end of the sealing ring is located in the second through hole and fits between the cover plate body and the lower plastic of the cover plate.

9. The battery cover according to claim 8, characterized in that, The first ceramic ring is fitted onto the outer wall of the plastic end of the sealing ring near the lower part of the cover plate.

10. The battery cover according to claim 7, characterized in that, The ends of the positive and negative lower terminals that are furthest from the cover plate body are higher than the positive terminal cover plate or the negative terminal cover plate.

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