Battery cover plate and lithium battery

Abstract

The utility model relates to the field of lithium battery, discloses a battery cover plate and lithium battery, battery cover plate includes cover plate body, pole, first heatproof insulator and second heatproof insulator, pole includes pole body and press plate, pole body passes through cover plate body, press plate is provided on the outer side of cover plate body and with pole body fixed connection, and the second heatproof insulator is provided with the first heatproof insulator and the second heatproof insulator. The first heat-resistant insulating part is supported between the pressing plate and the cover plate body, and the second heat-resistant insulating part is arranged around the pole body and is positioned between the pole body and the cover plate body. The battery cover plate provided by the utility model can avoid short circuit caused by direct contact between the pole and the cover plate body when the battery is in thermal runaway, obviously improves the safety of the battery, and has higher mechanical strength.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of lithium battery, specifically relates to a battery cover plate and lithium battery. BACKGROUND

[0002] With the development of new energy technology, lithium battery is widely used in various fields due to its high energy density, long service life and other advantages. However, lithium battery may encounter various safety risks during use, especially under extreme conditions such as high temperature and overcharge, the safety of the battery is particularly important.

[0003] In the existing lithium battery, the battery cover plate includes a cover plate body and a pole passing through the cover plate body. In order to avoid short circuit caused by direct contact between the pole and the cover plate body, a plastic plate and a sealing ring are usually arranged between the pole and the cover plate body. In actual application, when the battery cell of the lithium battery is impacted or short circuit causes thermal runaway, a large amount of heat will melt the plastic plate and the sealing ring on the cover plate, resulting in direct contact between the pole and the cover plate body and short circuit, which has a great safety problem. SUMMARY

[0004] In view of the above deficiencies or shortcomings in the prior art, the utility model provides a battery cover plate and lithium battery, which can effectively improve the safety factor of the battery and reduce the possibility of short circuit.

[0005] To achieve the above purpose, the utility model provides a battery cover plate, which comprises:

[0006] a cover plate body;

[0007] a pole comprising a pole body and a pressing plate, the pole body penetrating through the cover plate body, and the pressing plate being arranged on the outer side of the cover plate body and fixedly connected with the pole body;

[0008] a first heat-resistant insulating piece supported between the pressing plate and the cover plate body;

[0009] a second heat-resistant insulating piece arranged around the pole body and located between the pole body and the cover plate body.

[0010] Optionally, the first heat-resistant insulating piece is a columnar heat-resistant insulating column.

[0011] Optionally, the battery cover plate comprises a plurality of heat-resistant insulating columns, and the plurality of heat-resistant insulating columns are arranged at intervals around the pole body.

[0012] Optionally, the cover plate body is provided with a first mounting blind hole, the pressing plate is provided with a second mounting blind hole, and the two ends of the heat-resistant insulating column are respectively limited in the first mounting blind hole and the second mounting blind hole.

[0013] Optionally, the two ends of the heat-resistant insulation column are respectively in gap fit with the first mounting blind hole and the second mounting blind hole.

[0014] Optionally, the first heat-resistant insulation piece is made of ceramic material.

[0015] Optionally, the second heat-resistant insulation piece is a heat-resistant insulation ring in a circular ring shape.

[0016] Optionally, the heat-resistant insulation ring is respectively in gap fit with the pole column body and the cover plate body.

[0017] Optionally, the second heat-resistant insulation piece is made of ceramic material.

[0018] The utility model also provides a lithium battery, the battery cover plate of including above.

[0019] Through the above technical scheme, in the battery cover plate of the utility model, the first heat-resistant insulation piece is supported between the pressing plate of the pole column and the cover plate body, and the second heat-resistant insulation piece is arranged between the pole column body and the cover plate body, so that when the plastic plate and the sealing ring between the pole column and the cover plate body melt due to the heat runaway of the battery and the like, the first heat-resistant insulation piece and the second heat-resistant insulation piece can play the role of support and insulation, avoid the direct contact between the pole column and the cover plate body to cause the short circuit, and the safety of the battery is significantly improved. In addition, the support of the first heat-resistant insulation piece and the second heat-resistant insulation piece also improves the mechanical strength of the battery cover plate.

[0020] Other features and advantages of the utility model will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with the following specific embodiments, but do not constitute the limitation to the utility model. In the drawings:

[0022] Figure 1 It is the structure schematic diagram of the battery cover plate in an embodiment of the utility model;

[0023] Figure 2 It is the structure exploded view of the battery cover plate in the utility model; Figure 1

[0024] Figure 3 It is the partial cross section view of the battery cover plate in the utility model. Figure 1

[0025] Legend of the drawing:

[0026] 1 cover plate body

[0027] 2 pole column body​​

[0028] 3 pressing plate

[0029] 4 heat-resistant insulation column

[0030] 5 heat-resistant insulation ring

[0031] 6 plastic plate

[0032] 7 sealing ring DETAILED DESCRIPTION

[0033] The specific embodiments of the utility model will be described in detail below in combination with the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0034] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0035] In the utility model, the orientation words such as 'center', 'longitudinal', 'transverse', 'upper', 'lower', 'front','rear', 'left', 'right','vertical', 'horizontal', 'top', 'bottom', 'inner', 'outer' and the like indicate the orientation or position relationship generally based on the orientation or position relationship shown in the drawings, and are only used for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as the limitation on the embodiments of the utility model, and the indicated devices or elements must have a specific orientation, a specific orientation structure and operation, and therefore cannot be understood as the limitation on the embodiments of the utility model; the orientation words 'inner and outer' refer to the inner and outer relative to the contour of each component.

[0036] The utility model will be described in detail below in combination with the drawings and embodiments.

[0037] Referring to the drawings Figure 1 to the drawings Figure 3 The utility model first exemplary embodiment provides a kind of battery cover plate, comprising:

[0038] cover plate body 1;

[0039] pole column, including pole column body 2 and pressing plate 3, pole column body 2 is passed through cover plate body 1, and pressing plate 3 is arranged at the outer side of cover plate body 1, and is fixedly connected with pole column body 2;

[0040] first heat-resistant insulation piece, is supported between pressing plate 3 and cover plate body 1;

[0041] second heat-resistant insulation piece, is arranged around pole column body 2, and is located between pole column body 2 and cover plate body 1.

[0042] It should be noted that the outer side of the cover plate body 1, i.e. the side of the cover plate body 1 away from the battery cell, and the inner side of the cover plate body 1, i.e. the side of the cover plate body 1 towards the battery cell, are the same.

[0043] In actual application, a plastic plate 6 is arranged between the pressing plate 3 and the cover plate body 1, and a sealing ring 7 is arranged between the pole body 2 and the cover plate body 1. In the battery cover plate of the embodiment, a first heat-resistant insulating member is supported between the pressing plate 3 of the pole and the cover plate body 1, and a second heat-resistant insulating member is arranged between the pole body 2 and the cover plate body 1. In this way, when the plastic plate 6 and the sealing ring 7 between the pole and the cover plate body 1 melt due to battery thermal runaway or the like, the first heat-resistant insulating member and the second heat-resistant insulating member can play a supporting and insulating role, avoiding the direct contact between the pole and the cover plate body 1 to cause short circuit, and significantly improving the safety of the battery; in addition, the supporting role of the first heat-resistant insulating member and the second heat-resistant insulating member also improves the mechanical strength of the battery cover plate. Specifically, the first heat-resistant insulating member penetrates the plastic plate 6, and the second heat-resistant insulating member is located between the sealing ring 7 and the cover plate body 1.

[0044] In addition, the pole can be a negative pole and / or a positive pole.

[0045] Specifically, the battery cover plate further comprises an explosion-proof valve and a plastic pad, the explosion-proof valve is arranged on the cover plate body 1, the pole body 2 comprises a welded columnar portion and a plate-shaped portion, the columnar portion penetrates the cover plate body 1, and the plate-shaped portion is provided with a plastic pad between the inner side of the cover plate body 1.

[0046] Specifically, the pressing plate 3 and the pole body 2 can be fixedly connected by welding.

[0047] It can be understood that the first heat-resistant insulating member and the second heat-resistant insulating member can be an integral structure, for example, the first heat-resistant insulating member and the second heat-resistant insulating member are an integral cylindrical insulating member, the cylindrical insulating member surrounds the pole body 2, part of which is located between the pole body 2 and the cover plate body 1, and part of which extends to the outside of the cover plate body 1 and is supported between the pressing plate 3 and the cover plate body 1; of course, the first heat-resistant insulating member and the second heat-resistant insulating member can also be independent components, which can be specifically referred to in subsequent embodiments.

[0048] In an alternative embodiment, the first heat-resistant insulating member is a columnar heat-resistant insulating column 4. Specifically, the heat-resistant insulating column 4 can be a columnar structure with a circular, elliptical, rectangular or other cross-sectional shape. In this way, a reliable and good supporting role can be played to maintain a certain distance between the pressing plate 3 and the cover plate body 1.

[0049] Of course, in some other embodiments, the first heat-resistant insulating member can also have other shapes, for example, it can be a circular ring structure surrounding the pole body 2.

[0050] In an alternative embodiment, the battery cover plate comprises a plurality of heat-resistant insulation columns 4 which are arranged at intervals around the pole body 2. In this way, any part between the pressing plate 3 and the cover plate body 1 is kept at a certain distance, improving the reliability of avoiding contact between the pressing plate 3 and the cover plate body 1.

[0051] Specifically, the number and arrangement of the heat-resistant insulation columns 4 can be selected according to actual needs, for example, the number of heat-resistant insulation columns 4 can be 4, 6 or 8, etc., and the plurality of heat-resistant insulation columns 4 can be evenly distributed at intervals around the pole body 2.

[0052] In an alternative embodiment, the cover plate body 1 is provided with a first mounting blind hole, the pressing plate 3 is provided with a second mounting blind hole, and the two ends of the heat-resistant insulation column 4 are respectively limited in the first mounting blind hole and the second mounting blind hole. In this way, it can be supported between the pressing plate 3 and the cover plate body 1.

[0053] Specifically, the two ends of the heat-resistant insulation column 4 are respectively in clearance fit with the first mounting blind hole and the second mounting blind hole. In this way, the two ends of the heat-resistant insulation column 4 are easily inserted into the first mounting blind hole and the second mounting blind hole, effectively reducing the installation difficulty of the heat-resistant insulation column 4.

[0054] In an alternative embodiment, the first heat-resistant insulation member is of ceramic material. In this way, the first heat-resistant insulation member has good heat resistance and insulation properties. Of course, in some other embodiments, the first heat-resistant insulation member can also be of other materials with good heat resistance and insulation properties.

[0055] In an alternative embodiment, the second heat-resistant insulation member is a circular heat-resistant insulation ring 5. In this way, it can effectively prevent direct contact between the pole body 2 and the cover plate body, improving the reliability of avoiding short circuit.

[0056] Of course, in some other embodiments, the second heat-resistant insulation member can also have other shapes, for example, the second heat-resistant insulation member can also have a spiral structure or a cylindrical structure, etc.

[0057] In an alternative embodiment, the heat-resistant insulation ring 5 is in clearance fit with the pole body 2 and the cover plate body 1. In this way, the heat-resistant insulation ring 5 is easily placed between the pole body 2 and the cover plate body 1, effectively reducing the installation difficulty of the heat-resistant insulation ring 5.

[0058] In an alternative embodiment, the second heat-resistant insulation member is of ceramic material. In this way, the second heat-resistant insulation member has good heat resistance and insulation properties. Of course, in some other embodiments, the second heat-resistant insulation member can also be of other materials with good heat resistance and insulation properties.

[0059] The second exemplary embodiment of the utility model discloses a kind of lithium batteries, and lithium battery includes the battery cover plate as described above. The specific structure of the battery cover plate refers to the above embodiment, since the lithium battery of the utility model adopts all technical solutions of the above all embodiments, at least has all beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0060] In the description of the utility model, it is understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0061] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; It can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or indirectly connected through intermediate medium; it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0062] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms is not necessarily for 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. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the characteristics of different embodiments or examples without contradiction.

[0063] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary, and cannot be understood as limiting the utility model, and the skilled in the art can change, modify, replace and modify the above embodiments within the scope of the utility model.

Claims

1. A battery cover plate, characterized by, The battery cover plate comprises: a cover plate body (1); a pole column comprising a pole column body (2) and a pressing plate (3), the pole column body (2) penetrating through the cover plate body (1), and the pressing plate (3) being arranged on the outer side of the cover plate body (1) and fixedly connected with the pole column body (2); a first heat-resistant insulation piece supported between the pressing plate (3) and the cover plate body (1); a second heat-resistant insulation piece arranged around the pole column body (2) and between the pole column body (2) and the cover plate body (1).

2. The battery cover plate of claim 1, wherein, The first heat-resistant insulation piece is a heat-resistant insulation column (4) in a column shape.

3. The battery cover plate of claim 2, wherein, The battery cover plate comprises a plurality of heat-resistant insulation columns (4) arranged at intervals around the pole column body (2).

4. The battery cover plate of claim 2, wherein, The cover plate body (1) is provided with a first mounting blind hole, the pressing plate (3) is provided with a second mounting blind hole, and the two ends of the heat-resistant insulation column (4) are respectively limited in the first mounting blind hole and the second mounting blind hole.

5. The battery cover plate of claim 4, wherein, The two ends of the heat-resistant insulation column (4) are respectively in clearance fit with the first mounting blind hole and the second mounting blind hole.

6. The battery cover plate of claim 1, wherein, The first heat-resistant insulation piece is made of ceramic material.

7. The battery cover plate of claim 1, wherein, The second heat-resistant insulation piece is a heat-resistant insulation ring (5) in a circular ring shape.

8. The battery cover plate of claim 7, wherein, The heat-resistant insulation ring (5) is respectively in clearance fit with the pole column body (2) and the cover plate body (1).

9. The battery cover plate of claim 1, wherein, The second heat-resistant insulation piece is made of ceramic material.

10. A lithium battery, characterized by, The battery cover plate comprises a battery cover plate according to any one of claims 1 to 9. The battery cover plate comprises a battery cover plate according to any one of claims 1 to 9.

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