Battery cover plate assembly, battery comprising battery cover plate assembly and battery module comprising battery cover plate assembly

Abstract

The utility model relates to the technical field of battery safety, and particularly provides a battery cover plate assembly, a battery comprising the battery cover plate assembly and a battery module comprising the battery cover plate assembly. The battery cover plate assembly comprises a cover plate, a pole, a first insulating part and a second insulating part, a through hole is formed in the cover plate, the pole is connected to the position, where the through hole is formed, of the cover plate, and the first insulating part is arranged between the through hole and the pole; the second insulating part is connected to the cover plate, the second insulating part and the first insulating part are arranged at intervals to form a gap, the size of the gap is a, the minimum distance between the pole and the gap is b, and a / b is larger than or equal to 0.2 and smaller than or equal to 1.5. In the invention, the minimum distance between the pole and the gap can be understood as the creepage distance between the pole and the cover plate, and the ratio of the size of the gap to the creepage distance is controlled to be within a reasonable range, so that the risk that the air gap between the first insulating part and the second insulating part is broken down when the voltage is relatively high is dealt with.

Description

Technical Field

[0001] This application relates to the technical field of battery safety, and specifically proposes a battery cover assembly and a battery and battery module including the same. Background Technology

[0002] In some batteries, the terminals are connected to the tabs of the battery cell through the terminal holes in the cover plate. A sealing ring is provided between the terminals and the terminal holes in the cover plate, and the sealing ring mainly serves a sealing function. The side of the cover plate facing the battery cell has a lower plastic plate, which serves an insulating function and also needs to have the rigidity to support the battery cell. Due to the limitations of the manufacturing process, it is not possible to combine the two materials together, so it needs to be made into a separate structure. In addition, due to the aging of materials over a long period of use, a larger gap can easily form between the lower plastic plate and the sealing ring.

[0003] When multiple batteries are connected in series, the voltage of the battery pack increases, which in turn increases the voltage difference between the terminals and the cover plate. This can easily break down the air gap between the lower plastic plate and the sealing ring, causing insulation failure, short circuit between the terminals and the cover plate, and triggering thermal runaway. Utility Model Content

[0004] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:

[0005] In a first aspect, this application proposes a battery cover assembly, which includes a cover plate, a terminal post, a first insulating member, and a second insulating member. The cover plate has a through hole, the terminal post is connected to the position of the through hole in the cover plate, and the first insulating member is disposed between the through hole and the terminal post. The second insulating member is connected to the cover plate, and the second insulating member and the first insulating member are spaced apart to form a gap. The size of the gap is a, and the minimum distance between the terminal post and the gap is b, which satisfies 0.2≤a / b≤1.5.

[0006] The technical solution proposed in this application has at least the following technical effects:

[0007] In this application, the minimum distance between the terminal and the gap can be understood as the creepage distance between the terminal and the cover plate. Controlling the ratio of the gap size to the creepage distance within a reasonable range addresses the risk of breakdown of the air gap between the first and second insulators when the voltage is high. Specifically, when the gap size *a* and the minimum distance *b* between the gap and the terminal satisfy 0.2 ≤ *a / b* ≤ 1.5, the first and second insulators provide the battery with good insulation and sealing performance, ensuring battery safety and preventing breakdown between the terminal and the cover plate. However, when *a / b* > 1.5, breakdown between the terminal and the cover plate may occur, affecting battery safety performance. When *a / b* < 0.2, installation of the first and second insulators becomes difficult, affecting assembly efficiency. Attached Figure Description

[0008] To better integrate the content illustrated in the accompanying drawings with the description of the specific embodiments, a brief introduction to the drawings is provided below. It is understood that the accompanying drawings mentioned below are merely schematic illustrations of some embodiments of the relevant technical solutions and the technical solutions of this application. Without creative effort, those skilled in the art can create drawings illustrating other embodiments.

[0009] Specifically, the annotations for the accompanying drawings are as follows:

[0010] Figure 1 This is a partial structural schematic diagram of the first type of battery cover assembly described in some embodiments of this application;

[0011] Figure 2 This is a partial structural schematic diagram of the second type of battery cover assembly described in some embodiments of this application;

[0012] Figure 3 This is a partial structural schematic diagram of the third type of battery cover assembly described in some embodiments of this application.

[0013] Specifically, the annotations for the figure marks in the specification are as follows:

[0014] 10. Cover plate; 101. Flanged edge; 20. Pole post; 201. First part; 202. Second part; 30. First insulating component; 40. Second insulating component; 304. Gap; 50. Third insulating component; 60. Adapter. Detailed Implementation

[0015] To make the embodiments of this application clearer, they will be described below in conjunction with the accompanying drawings. It is to be understood that the content mentioned below is only a partial embodiment of this application, while the complete list of all embodiments is provided. Therefore, other embodiments obtained based on the following embodiments without any inventive effort all fall within the protection scope of this application.

[0016] It should be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to impose strict limitations on the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not preclude the possibility that the feature may be plural in other embodiments.

[0017] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.

[0018] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.

[0019] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.

[0020] The embodiments of this application will now be described with reference to the accompanying drawings.

[0021] Firstly, referring to Figures 1 to 3 This application proposes a battery cover assembly, which includes a cover plate 10, a terminal post 20, a first insulating member 30, and a second insulating member 40. The cover plate 10 has a through hole, and the terminal post 20 is connected to the position of the through hole in the cover plate 10. The first insulating member 30 is disposed between the through hole and the terminal post 20. The second insulating member 40 is connected to the cover plate 10, and the second insulating member 40 and the first insulating member 30 are spaced apart to form a gap 304. The size of the gap 304 is a, and the minimum distance between the terminal post 20 and the gap 304 is b, which satisfies 0.2≤a / b≤1.5.

[0022] In this embodiment, the minimum distance between the terminal post 20 and the gap 304 can be understood as the creepage distance between the terminal post 20 and the cover plate 10. By controlling the size of the gap 304 and the creepage distance within a reasonable range, the risk of breakdown of the air gap between the first insulator 30 and the second insulator 40 when the voltage is high can be addressed. Specifically, when the size a of the gap 304 and the minimum distance b between the gap 304 and the terminal post 20 satisfy 0.2≤a / b≤1.5, the first insulator 30 and the second insulator 40 can enable the battery to have good insulation and sealing performance, while ensuring the safety of the battery and preventing breakdown between the terminal post 20 and the cover plate 10. However, when a / b>1.5, it may cause breakdown between the terminal post 20 and the cover plate 10, thereby affecting the safety performance of the battery. When a / b<0.2, it will cause difficulties in installing the first insulator 30 and the second insulator 40, thereby affecting the assembly efficiency.

[0023] Optionally, 0.1mm ≤ a ≤ 1.5mm, for example, a can be any value or a range between any two of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, and 1.5mm. Optionally, 0.5mm ≤ b ≤ 1mm, for example, b can be any value or a range between any two of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, and 1.0mm. At the same time, a and b must satisfy 0.2≤a / b≤1.5. For example, a / b can be any value or a range between any two values ​​of 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4 and 1.5.

[0024] Specifically, the first insulating component 30 not only provides insulation but also acts as a seal to prevent the electrolyte inside the battery from leaking out; while the second insulating component 40 is connected to the side of the cover plate 10 facing the battery cell, and its function is to prevent the battery cell, the terminal post 20, or the adapter 60 from short-circuiting with the cover plate 10.

[0025] In some embodiments, refer to Figure 1 and Figure 2 The structure of the pole post 20 is located inside the through hole and satisfies 0.2≤a / b≤1.3.

[0026] In this embodiment, a portion of the structure of the pole post 20 is located within the through hole, as shown in the reference. Figure 1 and Figure 2 When the voltage is high, the terminal 20 is prone to short-circuiting with the cover plate 10. Therefore, controlling 0.2≤a / b≤1.3 can make the battery have better insulation and sealing performance, and will not affect the assembly efficiency of the first insulating component 30 and the second insulating component 40.

[0027] In some embodiments, refer to Figure 3 The entire structure of pole post 20 is located outside the through hole and satisfies 0.6≤a / b≤1.5.

[0028] In this embodiment, the entire structure of the pole post 20 is located outside the through hole, as shown in the reference. Figure 3 Since the terminal 20 and the cover plate 10 are not prone to short circuit, controlling 0.6≤a / b≤1.5 can give the battery good insulation and sealing performance, and will not affect the assembly efficiency of the first insulating component 30 and the second insulating component 40.

[0029] Specifically, the pole post 20 is located on the side of the cover plate 10 facing away from the battery cell, and the tab or adapter 60 passes through the through hole and connects to the pole post 20; more specifically, the tab refers to a conductive component connected to the current collector in the battery cell electrode, which can be directly or indirectly connected to the pole post 20 through the adapter 60; and the adapter 60 can be a metal sheet with a certain rigidity connected between the tab and the pole post 20.

[0030] In some embodiments not shown in the figures, the surface of the cover plate 10 corresponding to the gap 304 and / or the surface of the pole post 20 corresponding to the gap 304 are provided with a high-temperature resistant insulating layer, satisfying 0.5≤a / b≤1.5. In some embodiments, the high-temperature resistant insulating layer is a high-temperature resistant insulating coating or a high-temperature resistant insulating tape, and / or, the melting point of the high-temperature resistant insulating layer is T, and satisfies T≥300℃.

[0031] It should be understood that when high-temperature resistant insulating coatings or high-temperature resistant insulating tapes are applied, the insulation performance of the exposed area can be improved. In this case, 0.5≤a / b≤1.5 can ensure the insulation performance, and the presence of the insulating coating or insulating tape will not affect the assembly of the first insulating component 30 and the second insulating component 40.

[0032] Alternatively, the material of the high-temperature resistant insulating tape can be polytetrafluoroethylene or polyimide; the high-temperature resistant insulating coating can be alumina or silicon nitride.

[0033] In some embodiments, refer to Figure 1 The first insulating member 30 and the second insulating member 40 are spaced apart along the thickness direction of the cover plate 10 to form a gap 304, and satisfy 0.2≤a / b≤1.0.

[0034] In this embodiment, the first insulating member 30 and the second insulating member 40 are spaced apart along the thickness direction of the cover plate 10 to form a gap 304, as shown in the figure. Figure 1The gap 304 will expose part of the inner wall of the through hole. When 0.2≤a / b≤1.0, it can prevent voltage breakdown between the pole post 20 and the inner wall of the through hole of the cover plate 10, thereby ensuring battery safety, and will not affect the installation of the first insulating component 30 and the second insulating component 40.

[0035] In some embodiments, refer to Figure 2 The first insulating member 30 and the second insulating member 40 are arranged radially apart along the pole post 20 to form a gap 304, and satisfy 0.5≤a / b≤1.5.

[0036] In this embodiment, the first insulating member 30 and the second insulating member 40 are arranged radially apart to form a gap 304 along the pole post 20, as shown in the figure. Figure 2 The first insulating member 30 wraps around the end of the second insulating member 40, and the gap 304 between them will not expose the inner wall of the through hole. When 0.5≤a / b≤1.5, it can not only avoid voltage breakdown between the pole post 20 and the inner wall of the through hole of the cover plate 10, thus ensuring battery safety, but also will not affect the installation of the first insulating member 30 and the second insulating member 40.

[0037] In some embodiments, refer to Figure 1 and Figure 2 The battery cover assembly includes an adapter 60, which is connected to the terminal post 20 and satisfies 0.5≤a / b≤1.2.

[0038] In this embodiment, an adapter 60 is provided between the terminal post 20 and the tab. When 0.5≤a / b≤1.2, the battery has good insulation performance, which not only avoids voltage breakdown between the terminal post 20 and the cover plate 10, but also avoids voltage breakdown between the adapter 60 and the cover plate 10, thereby ensuring battery safety.

[0039] To illustrate this embodiment more clearly, the structure of the battery cover assembly is further described below.

[0040] Specifically, the battery cover assembly also includes a third insulating member 500, which is disposed on the side of the cover 10 opposite to the battery cell and isolates the terminal post 20 from this side. More specifically, the terminal post 20 includes a first portion 201 and a second portion 202 connected together, such as a copper-aluminum composite terminal post. In some cases, such as... Figures 1 to 3 In the embodiment shown, the cover plate 10 is provided with a flange 101, which wraps around the end of the pole post 20, and a third insulating member 50 is provided between the flange 101 and the first part 201 of the pole post 20.

[0041] Secondly, this application proposes a battery including a cell, a casing, and a battery cover assembly according to the first aspect. The casing has an opening, the cell is disposed inside the casing through the opening, the cell has tabs, a cover plate 10 in the battery cover assembly seals the opening, a terminal post 20 in the battery cover assembly is connected to the tabs, and a second insulating member 40 in the battery cover assembly faces the cell.

[0042] Thirdly, this application proposes a battery module, which includes a frame, a conductive busbar, and multiple batteries, the multiple batteries being connected to the conductive busbar respectively, and the multiple batteries and the conductive busbar being mounted on the frame.

[0043] Optionally, the battery is a prismatic or cylindrical battery; optionally, the battery casing is made of stainless steel.

[0044] It should be understood that both the battery in the second aspect and the battery module in the third aspect include the battery cover assembly in the first aspect. Therefore, both the battery in the second aspect and the battery module in the third aspect have at least all the technical effects of the battery cover assembly in the first aspect, and their specific technical effects will not be elaborated here.

[0045] In particular, the embodiments of the battery in the second aspect and the battery module in the third aspect only illustrate the structure related to the improvement points of this application, but do not mean that they do not have other structures. For example, the battery also includes an electrolyte, the battery module also includes a battery protection board, a heat dissipation structure, etc. Other structures will not be described in detail here.

[0046] It should be noted that the technical features involved in the different embodiments described above can be combined with each other as long as they do not conflict with each other.

[0047] Furthermore, the term "and / or" in this application should be understood as follows:

[0048] In the first case, the term “and / or” between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) both the first subject and the second subject.

[0049] In the second case, the term "and / or" between the last two of three or more subjects means including at least any one of the subjects. For example, "first subject, second subject and / or third subject" has the same meaning as "first subject and / or second subject and / or third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) first subject and second subject and no third subject; (5) first subject and third subject and no second subject; (6) second subject and third subject and no first subject; and (7) first subject, second subject and third subject;

[0050] The character " / " indicates that the objects before and after it are in an "or" relationship.

[0051] Finally, although the embodiments of this application have been described above in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the concept of this application, and such modifications and variations all fall within the scope of protection of this application.

Claims

1. A battery cover plate assembly, characterized by, The battery cover plate assembly comprises a cover plate (10), a pole (20), a first insulating part (30) and a second insulating part (40), the cover plate (10) is provided with a through hole, the pole (20) is connected to the position of the cover plate (10) provided with the through hole, and the first insulating part (30) is arranged between the through hole and the pole (20); The second insulating part (40) is connected to the cover plate (10), the second insulating part (40) and the first insulating part (30) are arranged in a spaced manner to form a gap (304), the size of the gap (304) is a, the minimum distance between the pole (20) and the gap (304) is b, and 0.2≤a / b≤1.5 is satisfied.

2. The battery cover plate assembly of claim 1, wherein, Part of the structure of the pole (20) is located in the through hole, and 0.2≤a / b≤1.3 is satisfied.

3. The battery cover plate assembly of claim 1, wherein, All the structures of the pole (20) are located outside the through hole, and 0.6≤a / b≤1.5 is satisfied.

4. The battery cover plate assembly of claim 1, wherein, The surface of the cover plate (10) corresponding to the gap (304) and / or the surface of the pole (20) corresponding to the gap (304) is provided with a high-temperature-resistant insulating layer, and 0.5≤a / b≤1.5 is satisfied.

5. The battery cover plate assembly of claim 4, wherein, The high-temperature-resistant insulating layer is a high-temperature-resistant insulating paint or a high-temperature-resistant insulating adhesive tape, and / or the melting point of the high-temperature-resistant insulating layer is T, and T≥300℃ is satisfied.

6. The battery cover plate assembly of any one of claims 1 to 5, wherein, The first insulating part (30) and the second insulating part (40) are arranged in a spaced manner along the thickness direction of the cover plate (10) to form the gap (304), and 0.2≤a / b≤1.0 is satisfied.

7. The battery cover plate assembly of any one of claims 1 to 5, wherein, The first insulating part (30) and the second insulating part (40) are arranged in a spaced manner along the radial direction of the pole (20) to form the gap (304), and 0.5≤a / b≤1.5 is satisfied.

8. The battery cover plate assembly of claim 7, wherein, The battery cover plate assembly comprises an adapter (60) connected to the pole (20), and 0.5≤a / b≤1.2 is satisfied.

9. A battery, characterized by The battery cover plate assembly comprises a battery core, a shell, and any one of claims 1 to 8, the shell has an opening, the battery core is arranged in the shell through the opening, the battery core has a tab, the cover plate (10) in the battery cover plate assembly covers and seals the opening, the pole (20) in the battery cover plate assembly is connected to the tab, and the second insulating part (40) in the battery cover plate assembly faces the battery core.

10. A battery module, characterized by The battery cover plate assembly comprises a frame, a conductive row, and a plurality of batteries according to claim 9, the plurality of batteries are respectively connected to the conductive row, and the plurality of batteries and the conductive row are mounted on the frame.

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