Battery top cover, lower insulating part thereof and battery

Abstract

The utility model relates to a battery top cover, a lower insulating part thereof and a battery. The battery top cover is used for sleeving a battery pole to assemble and form a battery, when the battery works, the battery top cover is provided with a first area and a second area, the temperature rising speed of the first area is different from that of the second area, and the lower insulating part is used for sleeving the battery pole and is located on the horizontal plane; the lower insulating part comprises a first part correspondingly arranged in the first area and a second part correspondingly arranged in the second area, the melting point of the first part is determined based on the temperature rising speed of the first area, and the melting point of the second part is determined based on the temperature rising speed of the second area. The lower insulating part can effectively avoid melting and is relatively low in cost.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a battery top cover and a lower insulating member thereof and a battery. Background Art

[0002] The melting points (materials) of the various parts of the lower insulating member of the battery top cover are usually the same, that is, the melting point (material) of the lower insulating member of the battery top cover is usually a single melting point (material). When the battery is working (safety testing, actual use), the temperature rises faster in some areas of the battery top cover and slower in some areas. In a short period of time (it can be considered that the heat of the various areas of the battery top cover has not yet begun to be conducted), the faster the temperature of the area, the higher the temperature, and the slower the temperature of the area, the lower the temperature. If the melting points (materials) of the various parts of the lower insulating member are the same and are all made of low melting point (not resistant to high temperatures) materials (whose melting points are less than or equal to the highest temperature that the lower insulating member can reach), the lower insulating member may melt when the battery is working, which may lead to (1) failure of the airtight structure of the pole (the pole leaks, the explosion-proof valve cannot open normally to release pressure, and explosion risk is likely to occur) and (2) insulation failure after the lower insulating member melts (short-circuiting of the positive and negative poles can easily ignite the battery cell). If the materials of all parts of the lower insulating member are the same and are all high melting point (high temperature resistant) materials (whose melting point is greater than the highest temperature that the lower insulating member can reach), the cost of the lower insulating member will increase, which will also increase the cost of the battery. Utility Model Content

[0003] Based on this, it is necessary to provide a lower insulating member of a battery top cover that can effectively avoid melting and has relatively low cost to address the above problems.

[0004] A lower insulating member of a battery top cover, the battery top cover is used to be sleeved on a battery pole to assemble a battery, when the battery is working, on a horizontal plane perpendicular to the sleeve direction of the battery top cover, the battery top cover includes a first area and a second area, the temperature rise rate of the first area is different from the temperature rise rate of the second area, the lower insulating member is used to be sleeved on the battery pole, and on the horizontal plane, the lower insulating member includes a first part and a second part;

[0005] The first part is correspondingly arranged in the first area;

[0006] The second part is correspondingly arranged in the second area;

[0007] The melting point of the first portion is determined based on a temperature increase rate of the first region, and the melting point of the second portion is determined based on a temperature increase rate of the second region.

[0008] In some optional embodiments, the first part has a first through hole, and the first part is sleeved on the second part through the first through hole.

[0009] In some optional embodiments, the first part has a first assembly step located at the first through hole, the second part has a second assembly step, and the first assembly step is engaged with the second assembly step.

[0010] In some optional embodiments, in the sleeve direction of the battery top cover, the first assembly step is closer to the outer side of the battery top cover than the second assembly step, and the thickness of the first assembly step is less than or equal to the height of the first assembly step; and / or

[0011] In the installation direction of the battery top cover, the side of the first part away from the outer side of the battery top cover is flush with the side of the second part away from the outer side of the battery top cover, and the side of the lower insulating part away from the outer side of the battery top cover is closer to the outer side of the battery top cover than the side of the battery pole away from the outer side of the battery top cover.

[0012] In some optional embodiments, the second portion has a second through hole, and the lower insulating member is sleeved on the battery pole through the second through hole.

[0013] In some optional embodiments, the second part includes a barrel portion, a first plate portion and a second plate portion. In the sleeve direction of the battery top cover, the first plate portion is located at the edge of the barrel portion close to the outer side of the battery top cover and is located inside the barrel portion, and the second plate portion is located at the edge of the barrel portion away from the outer side of the battery top cover and is located outside the barrel portion; the first plate portion has the second through hole, and the first plate portion cooperates with the barrel portion to form a first combined step, and the first combined step is used to be engaged with the battery pole, and the first plate portion, the barrel portion and the second plate portion cooperate to form a second combined step, and the second combined step is used to be engaged with the top cover sheet of the battery top cover.

[0014] In some optional embodiments, the melting point of one of the first part and the second part is greater than 200°C, and the melting point of the other of the first part and the second part is 150°C-170°C.

[0015] In some optional embodiments, the material of the portion with a melting point greater than 200° C. is PFA, PC, PET and PI, and the material of the portion with a melting point of 150° C.-170° C. is PP.

[0016] The present application also provides a battery top cover, comprising:

[0017] A sealing ring, used for sleeved on the battery pole;

[0018] The lower insulating member as mentioned above is used to be sleeved on the battery pole so that the sealing ring is located between the battery pole and the lower insulating member;

[0019] A top cover sheet, used for being sleeved on the battery pole and pressed on the sealing ring and the lower insulating member; and

[0020] The upper insulating member is used to be sleeved on the battery pole, and part of the upper insulating member is located between the top cover sheet and the battery pole and pressed on the sealing ring.

[0021] The present application also provides a battery, comprising the above-mentioned battery top cover.

[0022] In the above-mentioned lower insulating member, since the melting point of the first part is determined based on the heating rate of the first region, and the melting point of the second part is determined based on the heating rate of the second region, and the heating rate of the first region is different from the heating rate of the second region, the melting point of the first part is different from the melting point of the second part, and when the heating rate of the first region is greater than the heating rate of the second region, the melting point of the first part is greater than the melting point of the second part, and when the heating rate of the first region is less than the heating rate of the second region, the melting point of the first part is less than the melting point of the second part. Furthermore, in the above-mentioned lower insulating member, one of the first part and the second part can use a material with a higher cost and a higher melting point, and the other of the first part and the second part can use a material with a relatively lower cost and a lower melting point. Compared with the lower insulating member that uses a material with a high melting point as a whole, the above-mentioned lower insulating member can reduce the material cost, and compared with the lower insulating member that uses a material with a low melting point as a whole, the above-mentioned lower insulating member can effectively avoid melting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is an assembly diagram of a battery top cover and a battery terminal in one embodiment of the present application;

[0025] Figure 2 A cross-sectional view of a battery top cover and a battery terminal assembled together in one embodiment of the present application;

[0026] Figure 3 for Figure 2 An exploded view of the lower insulating member of the battery top cover is shown;

[0027] Figure 4 for Figure 2 A partial enlarged view of the middle A;

[0028] Figure 5 This is a diagram of the assembly process of the battery top cover and the battery pole in one embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, 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 application 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 application.

[0031] 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 at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0035] like Figure 1 As shown, the present application discloses a battery top cover 10. The battery top cover 10 is used to be sleeved on the battery pole 20 to assemble to form a battery. When the battery is working, on a horizontal plane perpendicular to the sleeve direction of the battery top cover 10, the battery top cover 10 includes a first area and a second area, and the heating rate of the first area is different from the heating rate of the second area. In some optional embodiments of the present application, the battery is a secondary battery. It should be noted that in a short period of time (it can be considered that the heat of each area of ​​the battery top cover 10 has not yet begun to conduct), the faster the heating rate, the higher the temperature of the area, and the slower the heating rate, the lower the temperature of the area.

[0036] When batteries with different structural designs are working, the first area and the second area of ​​the battery top cover 10 are usually different. When some structural types of batteries (secondary batteries for electric vehicles) are working, the area of ​​the battery top cover 10 close to the battery pole 20 heats up quickly, and the temperature rises relatively slowly in other areas; while when some structural types of batteries (secondary batteries for energy storage with fuses inside) are working, the area of ​​the battery top cover 10 close to the fuse heats up quickly, and the area of ​​the battery top cover 10 close to the battery pole 20 heats up relatively slowly.

[0037] In some optional embodiments of the present application, such as Figure 1-Figure 3As shown, the battery top cover 10 includes a sealing ring 300, a lower insulating member 400, a top cover sheet 500 and an upper insulating member 600. The sealing ring 300 is sleeved on the battery pole 20. The lower insulating member 400 is sleeved on the battery pole 20 so that the sealing ring 300 is located between the battery pole 20 and the lower insulating member 400. The top cover sheet 500 is sleeved on the battery pole 20 and pressed on the sealing ring 300 and the lower insulating member 400. The upper insulating member 600 is sleeved on the battery pole 20 and a portion of the upper insulating member 600 is located between the top cover sheet 500 and the battery pole 20 and pressed on the sealing ring 300. In this way, the sealing assembly and insulation assembly of the battery top cover 10 and the battery pole 20 are very easy to achieve.

[0038] In some optional embodiments of the present application, the lower insulating member 400 is sleeved on the battery pole 20. On the horizontal plane, the lower insulating member 400 includes a first portion 410 and a second portion 420. The first portion 410 is correspondingly arranged in the first area. The second portion 420 is correspondingly arranged in the second area. The melting point of the first portion 410 is determined based on the heating rate of the first area. The melting point of the second portion 420 is determined based on the heating rate of the second area.

[0039] In the above-mentioned lower insulating member 400, since the melting point of the first part 410 is determined based on the heating rate of the first region, and the melting point of the second part 420 is determined based on the heating rate of the second region, and the heating rate of the first region is different from the heating rate of the second region, the melting point of the first part 410 is different from the melting point of the second part 420, and when the heating rate of the first region is greater than the heating rate of the second region, the melting point of the first part 410 is greater than the melting point of the second part 420, and when the heating rate of the first region is less than the heating rate of the second region, the melting point of the first part 410 is less than the melting point of the second part 420. Furthermore, in the above-mentioned lower insulating member 400, one of the first part 410 and the second part 420 can use a material with a higher melting point and a higher cost, and the other of the first part 410 and the second part 420 can use a material with a lower melting point and a relatively lower cost. Compared with the lower insulating member that is entirely made of a material with a high melting point, the above-mentioned lower insulating member 400 can reduce the material cost, and compared with the lower insulating member that is entirely made of a material with a low melting point, the above-mentioned lower insulating member 400 can effectively avoid melting.

[0040] In some optional embodiments of the present application, the melting point of one of the first part 410 and the second part 420 is greater than 200°C, and the melting point of the other of the first part 410 and the second part 420 is 150°C-170°C. In this way, the cost reduction of the lower insulating member 400 and the avoidance of the melting of the lower insulating member 400 can be better considered. It can be understood that in some optional embodiments, the melting point range of the first part 410 and the melting point range of the second part 420 can also be determined according to the specific type of the battery.

[0041] In some optional embodiments of the present application, the material of the first part 410 and the material of the second part 420 are both plastic, and in this case, the lower insulating member 400 can also be called lower plastic. It can be understood that in some optional embodiments, at least one of the material of the first part 410 and the material of the second part 420 can also be other insulating materials other than plastic.

[0042] In some optional embodiments of the present application, the material of the part with a melting point greater than 200°C is PFA (Polyfluoroalkoxy), PC (Polycarbonate), PET (Polyethyleneterephthalate) and PI (Polyimide), and the material of the part with a melting point of 150°C-170°C is PP (Polypropylene).

[0043] In some optional embodiments of the present application, the first part 410 has a first through hole 412. The first part 410 is sleeved on the second part 420 through the first through hole 412. That is, in this embodiment, the first part 410 and the second part 420 are independent of each other, and the first part 410 is assembled on the second part 420 through the first through hole 412, which is very convenient for assembling the lower insulating member 400. It can be understood that in some optional embodiments, the first part 410 and the second part 420 can also be integrally molded by injection molding. In this case, it can be considered that the first part 410 and the second part 420 are a whole and are not independent of each other.

[0044] In some optional embodiments of the present application, the second part 420 has a second through hole 422. The lower insulating member 400 is sleeved on the battery pole 20 through the second through hole 422. That is, in some optional embodiments of the present application, the second part 420 is arranged close to the battery pole 20, and the second part 420 is arranged away from the battery pole 20. Specifically, in some optional embodiments of the present application, there are two battery poles 20, and the battery top cover 10 is sleeved on the two battery poles 20. Accordingly, there are two second parts 420 and one first part 410.

[0045] In some optional embodiments of the present application, the melting point of the second part 420 is greater than the melting point of the first part 410. At this time, when the battery is working, the area of ​​the battery top cover 10 close to the battery pole 20 heats up quickly, and the temperature rises in other areas is relatively slow. It can be understood that in some optional embodiments, the melting point of the first part 410 can also be greater than the melting point of the second part 420. At this time, when the battery is working, the area of ​​the battery top cover 10 close to the battery pole 20 heats up relatively slowly, and the temperature rises in other areas is relatively fast.

[0046] In some optional embodiments of the present application, the first part 410 has a first assembly step 414 located at the first through hole 412. The second part 420 has a second assembly step 424. The first assembly step 414 is engaged with the second assembly step 424. In this way, it is not only very convenient to assemble the lower insulating member 400, but also convenient to manufacture the first part 410 and the second part 420. It can be understood that in some optional embodiments, the first part 410 can also have a bump (or hole) located at the first through hole 412, and the second part 420 can have a hole that matches the bump (or a bump that matches the hole), and the bump is inserted into the hole.

[0047] In some optional embodiments of the present application, such as Figure 2 and Figure 4 As shown, in the sleeve direction of the battery top cover 10, the first assembly step 414 is closer to the outside of the battery top cover 10 relative to the second assembly step 424, that is, the first assembly step 414 is located above the second assembly step 424. The thickness of the first assembly step 414 (the thickness of the upper and lower surfaces of the entity) is d1. The height of the first assembly step 414 (the height of the upper and lower interfaces of the space) is h1. d1 is less than or equal to h1. In this way, it is possible to avoid the first assembly step 414 protruding beyond the upper side of the first part 410, thereby making it easier to assemble the top cover sheet 500 on the lower insulating member 400. Specifically, in this embodiment, d1 is equal to h1, and the upper side of the first assembly step 414 is flush with the upper side of the first part 410.

[0048] In some optional embodiments of the present application, in the sleeve direction of the battery top cover 10, the side of the first part 410 away from the outside of the battery top cover 10 is flush with the side of the second part 420 away from the outside of the battery top cover 10. The side of the lower insulating member 400 away from the outside of the battery top cover 10 is closer to the outside of the battery top cover 10 than the side of the battery pole 20 away from the outside of the battery top cover 10, that is, the lower side of the lower insulating member 400 is located above the lower side of the battery pole 20, that is, the lower side of the battery pole 20 protrudes beyond the lower side of the lower insulating member 400. In this way, the lower side of the lower insulating member 400 can be effectively prevented from protruding beyond the lower side of the battery pole 20, thereby preventing the lower side of the lower insulating member 400 from interfering with the electrical connection (welding) between the lower side of the battery pole 20 and the battery and its conductive elements. Specifically, the height difference between the lower side of the lower insulating member 400 and the lower side of the battery pole 20 is h2. The thickness of the first portion 410 and the thickness of the second portion 420 are both d2. The height h1 of the first assembly step 414 is less than the sum of h2 and d2.

[0049] In some optional embodiments of the present application, such as Figure 2 and Figure 3As shown, the second part 420 includes a barrel portion 420a, a first plate portion 420b and a second plate portion 420c. In the sleeve direction of the battery top cover 10, the first plate portion 420b is located at the edge (upper edge) of the barrel portion 420a close to the outer side of the battery top cover 10 and is located inside the barrel portion 420a, and the second plate portion 420c is located at the edge (lower edge) of the barrel portion 420a away from the outer side of the battery top cover 10 and is located outside the barrel portion 420a.

[0050] The first plate portion 420b has a second through hole 422. The second plate portion 420c has a second assembly step 424 at an edge away from the barrel portion 420a. The first plate portion 420b cooperates with the barrel portion 420a to form a first combined step located at the lower side of the second portion 420, and the first combined step is used to engage with the battery pole 20. The first plate portion 420b, the barrel portion 420a, and the second plate portion 420c cooperate to form a second combined step located at the upper side of the second portion 420. The second combined step is used to engage with the top cover sheet 500 of the battery top cover 10. In this way, it is very convenient to install the lower insulating member 400 on the battery pole 20, and it is also very convenient to install the top cover sheet 500 on the lower insulating member 400.

[0051] The present application also discloses a battery, which includes the battery top cover 10 and the battery pole 20 mentioned above.

[0052] like Figure 5 As shown, when assembling the battery top cover 10 and the battery pole 20, the sealing ring 300 can be sleeved on the battery pole 20 to obtain Figure 5 (a) structure; then the second portion 420 of the lower insulating member 400 can be sleeved on the battery pole 20 and the sealing ring 300 is located between the battery pole 20 and the lower insulating member 400, the second portion 420 is obtained Figure 5 (b) structure; then the first portion 410 of the lower insulating member 400 can be sleeved on the battery pole 20 to obtain Figure 5 (c) structure; further, a top cover sheet 500 may be sleeved on the battery pole 20 and the top cover sheet 500 may be pressed on the sealing ring 300 and the lower insulating member 400 to obtain Figure 5 Finally, the upper insulating member 600 may be sleeved on the battery pole 20 and a portion of the upper insulating member 600 may be located between the top cover sheet 500 and the battery pole 20 and pressed against the sealing ring 300 to obtain Figure 5 (e) structure in .

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A lower insulating member of a battery top cover, the battery top cover is used to be sleeved on a battery pole to assemble a battery, when the battery is working, on a horizontal plane perpendicular to the sleeve direction of the battery top cover, the battery top cover includes a first area and a second area, the temperature rise rate of the first area is different from the temperature rise rate of the second area, characterized in that: The lower insulating member is used to be sleeved on the battery pole. On the horizontal plane, the lower insulating member includes a first part and a second part; The first part is correspondingly arranged in the first area; The second part is correspondingly arranged in the second area; The melting point of the first portion is determined based on a temperature increase rate of the first region, and the melting point of the second portion is determined based on a temperature increase rate of the second region.

2. The lower insulating member of the battery top cover according to claim 1, characterized in that: The first part has a first through hole, and the first part is sleeved on the second part through the first through hole.

3. The lower insulating member of the battery top cover as claimed in claim 2, characterized in that: The first part has a first assembly step located at the first through hole, and the second part has a second assembly step, and the first assembly step is engaged with the second assembly step.

4. The lower insulating member of the battery top cover as claimed in claim 3, characterized in that: In the sleeve direction of the battery top cover, the first assembly step is closer to the outer side of the battery top cover than the second assembly step, and the thickness of the first assembly step is less than or equal to the height of the first assembly step; and / or In the installation direction of the battery top cover, the side of the first part away from the outer side of the battery top cover is flush with the side of the second part away from the outer side of the battery top cover, and the side of the lower insulating part away from the outer side of the battery top cover is closer to the outer side of the battery top cover than the side of the battery pole away from the outer side of the battery top cover.

5. The lower insulating member of the battery top cover according to any one of claims 1 to 4, characterized in that: The second portion has a second through hole, and the lower insulating member is sleeved on the battery pole through the second through hole.

6. The lower insulating member of the battery top cover as claimed in claim 5, characterized in that: The second part includes a barrel portion, a first plate portion and a second plate portion. In the sleeve direction of the battery top cover, the first plate portion is located at the edge of the barrel portion close to the outer side of the battery top cover and is located inside the barrel portion, and the second plate portion is located at the edge of the barrel portion away from the outer side of the battery top cover and is located outside the barrel portion; the first plate portion has the second through hole, and the first plate portion cooperates with the barrel portion to form a first combined step, and the first combined step is used to be embedded with the battery pole, and the first plate portion, the barrel portion and the second plate portion cooperate to form a second combined step, and the second combined step is used to be embedded with the top cover sheet of the battery top cover.

7. The lower insulating member of the battery top cover according to claim 1, characterized in that: The melting point of one of the first part and the second part is greater than 200°C, and the melting point of the other of the first part and the second part is 150°C-170°C.

8. The lower insulating member of the battery top cover according to claim 7, characterized in that: The material of the part with a melting point greater than 200°C is PFA, PC, PET or PI, and the material of the part with a melting point of 150°C-170°C is PP.

9. A battery top cover, characterized in that: include: A sealing ring, used for sleeved on the battery pole; The lower insulating member according to any one of claims 1 to 8, which is used to be sleeved on a battery pole so that the sealing ring is located between the battery pole and the lower insulating member; A top cover sheet, used for being sleeved on the battery pole and pressed on the sealing ring and the lower insulating member; and The upper insulating member is used to be sleeved on the battery pole, and part of the upper insulating member is located between the top cover sheet and the battery pole and pressed on the sealing ring.

10. A battery, characterized in that: Comprising the battery top cover as claimed in claim 9.

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