Battery cover plate and battery

Abstract

The utility model provides a battery cover plate and a battery. The battery cover plate comprises a base plate, wherein a first through hole through which a pole penetrates is formed in the base plate; the first insulating part is installed on the substrate, a second through hole is formed in the first insulating part, the second through hole is configured to allow the pole to penetrate through, and the second through hole and the first through hole are correspondingly arranged; the annular separator is mounted on the side, facing the first insulating part, of the substrate and located in the second through hole, and the melting point of the annular separator is larger than that of the first insulating part, so that the electrolyte in the battery cell and the first insulating part are separated through the annular separator. According to the battery cover plate provided by the technical scheme of the utility model, the problem that the insulation upper plastic of the battery cover plate in the prior art is melted when the battery is in thermal runaway, so that the sealing of the battery cover plate fails can be solved.

Description

Technical Field

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

[0002] As a high-performance energy storage device, lithium batteries are widely used in various fields, including new energy vehicles and energy storage power stations. They are one of the important means to solve energy shortages. Therefore, the safety of lithium batteries has become increasingly important. The battery cover is a key component of the battery assembly. It not only protects the battery from external physical damage, but also provides excellent electrical insulation and sealing properties to maintain normal battery operation and prevent accidents.

[0003] In the prior art, when a battery experiences thermal runaway and the temperature rises rapidly, the insulating upper plastic part of the battery cover is prone to melt, rendering the sealing function of the battery cover ineffective. Utility Model Content

[0004] The main purpose of the utility model is to provide a battery cover and a battery, which can solve the problem in the prior art that the insulating upper plastic part of the battery cover will melt when the battery suffers thermal runaway, resulting in failure of the battery cover seal.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a battery cover is provided, including: a substrate, a first through hole for passing a pole is provided on the substrate; a first insulating member is installed on the substrate, a second through hole is provided on the first insulating member, the second through hole is constructed to allow the pole to pass through, and the second through hole is arranged corresponding to the first through hole; and an annular isolating member is installed on the side of the substrate facing the first insulating member and is located in the second through hole, the melting point of the annular isolating member is greater than the melting point of the first insulating member, so as to isolate the electrolyte inside the battery cell and the first insulating member through the annular isolating member.

[0006] Furthermore, the annular isolating member is made of ceramic material.

[0007] Furthermore, the battery cover also includes a pressing block installed on the side of the first insulating member facing away from the substrate, the pressing block is provided with a mounting hole, the annular isolating member is connected to the side of the pressing block facing the substrate, and the annular isolating member is arranged around the mounting hole.

[0008] Furthermore, the first insulating member has an accommodating cavity communicated with the second through hole, the pressing block is embedded in the accommodating cavity, and the pole is sequentially penetrated by the first through hole and the mounting hole and is riveted to the pressing block.

[0009] Furthermore, the annular isolating member is connected to the inner wall of the second through hole.

[0010] Further, an annular groove is provided on the substrate on the outer peripheral side of the first through hole, and one side of the annular spacer facing the substrate is clamped in the annular groove and is in sealing fit with the annular groove.

[0011] Further, the battery cover plate further includes a seal, the seal is configured to be sleeved on the outer periphery of the pole column, the seal includes a seal body, and the seal body is used to seal the gap between the outer wall of the pole column and the inner wall of the first through hole. The melting point of the annular spacer is greater than the melting point of the seal.

[0012] Further, the battery cover plate further includes a second insulating member. The first insulating member and the second insulating member are respectively located on opposite sides of the substrate. The second insulating member is provided with a third through hole and a mounting groove communicating with the third through hole. The pole column includes a base and a column body. The third through hole is configured to allow the column body to pass through. The seal further includes a flange connected to the seal body, and the flange is used to seal the gap between the outer wall of the column body and the inner wall of the third through hole. At least a part of the base is clamped in the mounting groove.

[0013] Further, the thickness of the annular spacer ranges from 2 mm to 3 mm.

[0014] According to another aspect of the present invention, there is provided a battery, including: the above-mentioned battery cover plate; an electric core; a pole column; a housing having an opening and an inner cavity, the electric core is installed in the inner cavity, and the battery cover plate is covered at the opening.

[0015] Applying the technical solution of the present invention, by providing an annular spacer, and the melting point of the annular spacer is higher than the melting point of the first insulating member. When the electric core undergoes thermal runaway, the annular spacer can isolate high-temperature electrolyte, high-temperature molten matter, etc. from the first insulating member, which can not only prevent the first insulating member from melting, ensure the sealing effect of the battery cover plate, but also extend the service life of the first insulating member. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the

[0017] FIGURES:

[0018] Figure 1 Shows an exploded view of the battery cover plate of the embodiment of the present invention;

[0019] Figure 2 Shows a top view of the battery cover plate of the embodiment of the present invention;

[0020] Figure 3 Shows Figure 2 a cross-sectional view taken along A-A of

[0021] Figure 4 shows an enlarged view at position B in Figure 3 ;

[0022] Figure 5 shows a schematic structural view of a substrate of an embodiment of the present utility model;

[0023] Figure 6 shows a schematic structural view of a pressing block of an embodiment of the present utility model.

[0024] Among them, the above-mentioned drawings include the following reference numerals:

[0025] 10. Substrate; 11. First through hole; 12. Annular groove; 20. Pole column; 21. Base; 22. Column body; 23. Annular clamping groove; 30. First insulating member; 31. Second through hole; 32. Accommodating cavity; 40. Annular isolating member; 50. Pressing block; 51. Mounting hole; 52. Annular convex portion; 60. Sealing member; 61. Sealing main body; 62. Flange; 70. Second insulating member; 71. Third through hole; 72. Mounting groove. Specific embodiments

[0026] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0027] Referring to Figures 1 to 6 as shown, the present utility model provides a battery cover plate. The battery cover plate of this embodiment includes: a substrate 10, on which a first through hole 11 for passing through a pole column 20 is provided; a first insulating member 30, mounted on the substrate 10, on which a second through hole 31 is provided, and the second through hole 31 is configured to allow the pole column 20 to pass through, and the second through hole 31 is correspondingly arranged with the first through hole 11; and an annular isolating member 40, mounted on one side of the substrate 10 facing the first insulating member 30 and located in the second through hole 31, and the melting point of the annular isolating member 40 is greater than the melting point of the first insulating member 30, so as to isolate the electrolyte inside the battery cell and the first insulating member 30 through the annular isolating member 40.

[0028] In this embodiment, one end of the pole 20 is sequentially penetrated by a first through hole 11 and a second through hole 31, an annular isolating member 40 is installed on the top of the substrate 10, and the annular isolating member 40 is penetrated by the second through hole 31. Since the melting point of the annular isolating member 40 is greater than the melting point of the first insulating member 30, when thermal runaway occurs in the battery cell, the annular isolating member 40 can isolate the first insulating member 30 from the high-temperature electrolyte, high-temperature melt, etc. inside the battery cell, thereby preventing the first insulating member 30 from melting, thereby ensuring the sealing effect of the battery cover. In the prior art, when a battery cell experiences thermal runaway, the temperature of the high-temperature electrolyte far exceeds the melting point of the plastic part on the insulation, causing the plastic part on the insulation to melt. However, the present application adds an annular isolation part 40, and makes the melting point of the annular isolation part 40 higher than the melting point of the first insulation part 30. When a battery cell experiences thermal runaway, the annular isolation part 40 can isolate the high-temperature electrolyte, high-temperature melt, etc. from the first insulation part 30, thereby preventing the first insulation part 30 from melting and ensuring the sealing effect of the battery cover, and also extending the service life of the first insulation part 30.

[0029] In one embodiment, the first insulating member 30 is made of PPS (polyphenylene sulfide) material.

[0030] In one embodiment of the present invention, the annular spacer 40 is made of ceramic material.

[0031] In this embodiment, the annular isolator 40 made of ceramic material has a relatively high melting point (reaching above 1000°C). When thermal runaway occurs in the battery cell, the temperature of the high-temperature electrolyte, high-temperature melt, etc. is around 350°C. Therefore, the annular isolator 40 will not be melted by the high-temperature electrolyte, high-temperature melt, etc., and can isolate the high-temperature electrolyte, high-temperature melt, etc. from the first insulating member 30, thereby preventing the first insulating member 30 from being melted by the high-temperature electrolyte, high-temperature melt, etc.

[0032] In one embodiment, the annular spacer 40 is made of special ceramics (such as alumina ceramics, silicon carbide ceramics, etc.).

[0033] See also Figure 1 , Figure 4 and Figure 6 As shown, in one embodiment of the present invention, the battery cover further includes a pressing block 50 mounted on the side of the first insulating member 30 facing away from the substrate 10, and a mounting hole 51 is provided on the pressing block 50. The annular isolating member 40 is connected to the side of the pressing block 50 facing the substrate 10, and the annular isolating member 40 is arranged around the mounting hole 51.

[0034] In this embodiment, the mounting hole 51 is used for passing through the pole column 20, that is, one end of the pole column 20 sequentially passes through the first through hole 11, the second through hole 31, and the mounting hole 51. The annular spacer 40 is connected to the side of the pressing block 50 facing the substrate 10, and the annular spacer 40 is located on the outer periphery of the mounting hole 51. In this way, on the one hand, it can ensure that the pole column 20 smoothly passes through the first through hole 11, the second through hole 31, and the mounting hole 51. On the other hand, it can ensure that the annular spacer 40 can be smoothly installed on the side of the substrate 10 facing the first insulating member 30 and is located within the second through hole 31.

[0035] In one embodiment, the annular spacer 40 and the pressing block 50 are fixedly connected by bolts, screws, rivets, or the like.

[0036] In one embodiment, the annular spacer 40 is made of ceramic material, and the annular spacer 40 and the pressing block 50 can be adhesively fixed by a ceramic adhesive.

[0037] In one embodiment, the annular spacer 40 is an annular protrusion.

[0038] In one embodiment, the annular spacer 40 can be a circular ring or a rectangular ring.

[0039] Preferably, the annular spacer 40 is a closed annular protrusion, which can isolate high-temperature electrolyte, high-temperature molten matter, etc. from the first insulating member 30 in the entire circumferential direction, and the isolation effect is better.

[0040] In one embodiment, the annular spacer 40 and the pressing block 50 are integrally formed, so that the annular spacer 40 has good structural integrity and structural strength.

[0041] In one embodiment, the annular spacer 40 and the pressing block 50 are separately provided. When the annular spacer 40 or the pressing block 50 is damaged, only the damaged part needs to be replaced separately, and there is no need to replace all of them, which can save costs.

[0042] Combined with reference to Figure 1 and Figure 6 As shown, in one embodiment of the present invention, the first insulating member 30 has a receiving cavity 32 communicating with the second through hole 31. The pressing block 50 is embedded in the receiving cavity 32, and the pole column 20 sequentially passes through the first through hole 11 and the mounting hole 51 and is riveted to the pressing block 50.

[0043] Through the above settings, the installation of the pressing block 50 and the connection between the pole column 20 and the pressing block 50 can be realized.

[0044] In one embodiment, the pressing block 50 is made of aluminum metal.

[0045] In one embodiment of the present invention, the annular spacer 40 can also be directly connected to the inner wall of the second through hole 31.

[0046] In this embodiment, the annular spacer 40 is connected to the inner wall of the second through-hole 31, that is, the annular spacer 40 is inserted into the second through-hole 31, and the outer wall of the annular spacer 40 is connected to the inner wall of the second through-hole 31. When the battery cell undergoes thermal runaway, the annular spacer 40 can isolate high-temperature electrolyte, high-temperature molten matter, etc. from the inner wall of the second through-hole 31, preventing the first insulating member 30 from melting, thereby ensuring the sealing effect of the battery cover.

[0047] In one embodiment, the annular spacer 40 can be connected to the inner wall of the second through-hole 31 by bolts or screws.

[0048] In one embodiment, the annular spacer 40 is made of ceramic material, and the annular spacer 40 can be connected to the inner wall of the second through-hole 31 by a ceramic adhesive.

[0049] Referring to Figure 1 and Figure 4 As shown, in one embodiment of the present invention, an annular groove 12 is further provided on the substrate 10 on the outer peripheral side of the first through-hole 11. One side of the annular spacer 40 facing the substrate 10 is clamped in the annular groove 12 and is in sealing cooperation with the annular groove 12.

[0050] Through the above arrangement, not only can the installation and positioning of the annular spacer 40 be realized, but also the sealing effect of the battery cover can be ensured, preventing electrolyte, high-temperature molten matter, etc. from flowing out through the gap between the annular spacer 40 and the annular groove 12 when the battery undergoes thermal runaway.

[0051] In one embodiment of the present invention, the substrate 10 is made of aluminum material, and the annular spacer 40 is made of ceramic material. The annular spacer 40 can be adhesively fixed in the annular groove 12 by a ceramic adhesive.

[0052] In one embodiment, the thickness of the substrate 10 is greater than or equal to 2 mm to ensure the structural strength of the substrate 10.

[0053] Referring to Figures 1 to 6 As shown, in one embodiment of the present invention, the battery cover further includes a sealing member 60. The sealing member 60 is configured to be sleeved on the outer periphery of the pole column 20. The sealing member 60 includes a sealing body 61. The sealing body 61 is used to seal the gap between the outer wall of the pole column 20 and the inner wall of the first through-hole 11. The melting point of the annular spacer 40 is greater than the melting point of the sealing member 60.

[0054] In this embodiment, the seal 60 can seal the gap between the outer wall of the terminal post 20 and the inner wall of the first through hole 11, more effectively ensuring the sealing effect of the battery cover plate. The melting point of the annular spacer 40 is greater than that of the seal 60. When the battery undergoes thermal runaway, even if the seal 60 melts when contacting high-temperature electrolyte, high-temperature molten matter, etc., the annular spacer 40 can still isolate the high-temperature electrolyte, high-temperature molten matter, etc. from the first insulating member 30, preventing the first insulating member 30 from melting when contacting the high-temperature electrolyte, high-temperature molten matter, etc., and thus being able to extend the service life of the first insulating member 30.

[0055] Referring to Figures 1 to 6 As shown, in an embodiment of the present invention, the battery cover plate further includes a second insulating member 70. The first insulating member 30 and the second insulating member 70 are respectively located on opposite sides of the substrate 10. The second insulating member 70 is provided with a third through hole 71 and an installation groove 72 communicating with the third through hole 71. The terminal post 20 includes a base 21 and a column body 22. The third through hole 71 is configured to allow the column body 22 to pass through. The seal 60 further includes a flange 62 connected to the seal body 61. The flange 62 is used to seal the gap between the outer wall of the column body 22 and the inner wall of the third through hole 71. At least a part of the base 21 is clamped in the installation groove 72.

[0056] In this embodiment, the seal 60 can seal the gap between the outer wall of the column body 22 and the inner wall of the third through hole 71, preventing the electrolyte inside the battery from flowing out through the gap between the outer wall of the column body 22 and the inner wall of the third through hole 71.

[0057] As Figure 4 and Figure 5 As shown, in an embodiment of the present invention, the inner wall of the installation hole 51 is provided with an annular protrusion 52 protruding along the radial direction of the installation hole 51. The column body 22 is provided with an annular clamping groove 23 adapted to the annular protrusion 52. Through the above arrangement, after the terminal post 20 sequentially passes through the first through hole 11 and the installation hole 51 and is riveted and connected to the pressing block 50, the connection stability between the pressing block 50 and the terminal post 20 can be ensured.

[0058] In an embodiment of the present invention, the thickness of the annular spacer 40 ranges from 2 mm to 3 mm.

[0059] Through the above arrangement, the structural strength of the annular spacer 40 can be ensured.

[0060] According to another aspect of the present invention, there is provided a battery, including: the above-mentioned battery cover plate; an electric core; the terminal post 20; a housing having an opening and an inner cavity, the electric core is installed in the inner cavity, and the battery cover plate is covered at the opening.

[0061] In this embodiment, the battery cover plate of the battery has all the technical solutions and all the technical advantages of the above-mentioned battery cover plate, which will not be elaborated here.

[0062] From the above description, it can be seen that the above-mentioned embodiments of the present utility model achieve the following technical effects: by providing an annular spacer, and the melting point of the annular spacer is higher than that of the first insulating member, when the battery cell undergoes thermal runaway, the annular spacer can isolate the high-temperature electrolyte, high-temperature molten matter, etc. from the first insulating member, which can not only prevent the first insulating member from melting, ensure the sealing effect of the battery cover plate, but also extend the service life of the first insulating member.

[0063] Obviously, the above-described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A battery cover plate, characterized in that, Comprising: A substrate (10) having a first through-hole (11) formed thereon for passing through a terminal post (20); A first insulating member (30) mounted on the substrate (10), the first insulating member (30) having a second through-hole (31) formed thereon, the second through-hole (31) being configured to allow the terminal post (20) to pass through, and the second through-hole (31) being disposed corresponding to the first through-hole (11); And An annular spacer (40) mounted on a side of the substrate (10) facing the first insulating member (30) and located within the second through-hole (31), the melting point of the annular spacer (40) being greater than the melting point of the first insulating member (30) to isolate the electrolyte inside the battery cell from the first insulating member (30) through the annular spacer (40).

2. The battery cover plate according to claim 1, characterized in that The annular spacer (40) is made of a ceramic material.

3. The battery cover plate according to claim 1, wherein The battery cover further includes a pressing block (50) mounted on a side of the first insulating member (30) facing away from the substrate (10), the pressing block (50) having a mounting hole (51) formed thereon, the annular spacer (40) being connected to a side of the pressing block (50) facing the substrate (10), and the annular spacer (40) being disposed around the mounting hole (51).

4. The battery cover plate according to claim 3, wherein, The first insulating member (30) has a receiving cavity (32) communicating with the second through-hole (31), the pressing block (50) being embedded in the receiving cavity (32), and the terminal post (20) sequentially passes through the first through-hole (11) and the mounting hole (51) and is riveted to the pressing block (50).

5. The battery cover plate according to claim 1, wherein, The annular spacer (40) is connected to the inner wall of the second through-hole (31).

6. The battery cover plate according to any one of claims 1 to 5, characterized in that The substrate (10) further has an annular groove (12) formed on an outer peripheral side of the first through-hole (11), a side of the annular spacer (40) facing the substrate (10) being clamped in the annular groove (12) and sealingly engaged with the annular groove (12).

7. The battery cover plate according to any one of claims 1 to 5, characterized in that, The battery cover further includes a seal (60) configured to be sleeved around the outer periphery of the terminal post (20), the seal (60) including a seal body (61) for sealing a gap between an outer wall of the terminal post (20) and an inner wall of the first through-hole (11), and the melting point of the annular spacer (40) being greater than the melting point of the seal (60).

8. The battery cover plate according to claim 7, characterized in that, The battery cover plate further includes a second insulating member (70). The first insulating member (30) and the second insulating member (70) are respectively located on opposite sides of the substrate (10). The second insulating member (70) is provided with a third through hole (71) and a mounting groove (72) communicating with the third through hole (71). The pole post (20) includes a base (21) and a column body (22). The third through hole (71) is configured to allow the column body (22) to pass through. The seal member (60) further includes a flange (62) connected to the seal body (61). The flange (62) is used to seal the gap between the outer wall of the column body (22) and the inner wall of the third through hole (71). At least a part of the base (21) is clamped in the mounting groove (72).

9. The battery cover plate according to any one of claims 1 to 5, characterized in that, The thickness of the annular spacer (40) ranges from 2 mm to 3 mm.

10. A battery, characterized in that, Comprising: The battery cover plate according to any one of claims 1 to 9; A battery cell; A pole post (20); A housing having an opening and an inner cavity. The battery cell is installed in the inner cavity, and the battery cover plate is covered at the opening.

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