Battery and battery cover plate assembly thereof

Abstract

The utility model discloses a battery cover plate assembly, which comprises a cover plate body and a pole assembly, the pole assembly comprises a pole and a press-fit part, the pole protrudes out of the cover plate body, the press-fit part and the cover plate body are integrally arranged, the press-fit part is partially pressed on the surface, far away from the cover plate body, of the pole, and the cover plate body is arranged on the cover plate body. The cover plate body is provided with insulating parts, the insulating parts comprise a first insulating part and a second insulating part, the first insulating part is arranged on the surface of the cover plate body, the second insulating part comprises a convex hull structure, and the convex hull structure is arranged on the pole assembly in a wrapping mode. The elongation at break of the second insulator is greater than the elongation at break of the first insulator. According to the battery cover plate assembly disclosed by the utility model, reliable insulation protection on the pole is realized, the impact resistance of the insulating part is improved, and better protection on the battery is realized. The utility model also discloses a battery.

Description

Technical Field

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

[0002] Lithium batteries are widely used in electric vehicles, backup power systems, and microgrid energy storage systems due to their advantages such as high energy density and long lifespan.

[0003] The battery includes a casing, a battery cell, and a cover plate. The battery cell is placed inside the cavity of the casing, and the cover plate seals the top opening of the casing. Since the cover plate is made of metal, it is prone to becoming charged; therefore, an insulating plate is needed on the cover plate to insulate the battery from other structures. In terminal battery systems, such as... Figure 1 As shown, the cover plate 01 is riveted to the edge of the pole post 03 by the pressing part 02. The pressing part 02 and the cover plate 01 are an integral structure. Since the pressing part 02 is made of metal, how to achieve insulation of the pole post 03 has become a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of this, the present invention provides a battery cover assembly that achieves reliable insulation protection for the terminals, improves the impact resistance of the insulation components, and provides better protection for the battery.

[0005] This utility model also provides a battery.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A battery cover assembly includes a cover body and a terminal assembly. The terminal assembly includes a terminal and a pressing portion. The terminal protrudes from the cover body. The pressing portion is integrally formed with the cover body. The pressing portion is partially pressed onto the surface of the terminal away from the cover body. An insulating member is provided on the cover body. The insulating member includes a first insulating member and a second insulating member. The first insulating member is disposed on the surface of the cover body. The second insulating member includes a convex structure that surrounds the terminal assembly. The elongation at break of the second insulating member is greater than that of the first insulating member.

[0008] As can be seen from the above technical solution, in the battery cover assembly provided by this utility model, the elongation at break of the second insulating member is greater than that of the first insulating member, so that the second insulating member can form a convex structure to achieve insulation protection for the terminal post. The elongation at break of the first insulating member is less than that of the second insulating member, and part of the first insulating member is positioned opposite to the middle of the battery cell. In this way, when the battery is charging and discharging, the first insulating member can better withstand the impact force of the gas heat when it impacts the cover body, making the first insulating member less prone to deformation. By controlling the elongation at break of the first insulating member, the impact resistance of the first insulating member is improved, the fit between the first insulating member and the cover body is improved, and the insulation effect of the first insulating member is better.

[0009] This utility model also provides a battery, including a housing and a cover assembly, wherein a battery cell is placed inside the housing, and the cover assembly is connected to the top opening of the housing, and the cover assembly is the battery cover assembly described above.

[0010] The battery of this utility model includes the battery cover assembly described above, and therefore has the advantages of the battery cover assembly described above, which will not be repeated here. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a structural diagram of the pole position in the prior art;

[0013] Figure 2 An exploded view of the insulating component provided in this embodiment of the utility model;

[0014] Figure 3 A schematic diagram of the installation structure of the insulating component provided in an embodiment of this utility model;

[0015] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure at position AA in the middle;

[0016] Figure 5 for Figure 3 A cross-sectional view of the BB position;

[0017] Figure 6 This is a schematic diagram of the connection structure between the second insulating member and the first insulating member provided in another embodiment of the present invention;

[0018] Figure 7 A schematic diagram of the structure of the first insulating member provided in an embodiment of this utility model;

[0019] Figure 8 This is a schematic diagram of the structure of the second insulating member provided in an embodiment of the present utility model;

[0020] Figure 9 A cross-sectional view of the second insulating member provided in an embodiment of this utility model;

[0021] Figure 10 A partially enlarged structural diagram of the second insulating member installed at the pressing part position, as provided in an embodiment of this utility model;

[0022] Figure 11 This is a schematic diagram of the structure of the insulating component installed on the battery casing according to an embodiment of the present invention.

[0023] in:

[0024] 01. Cover plate; 02. Press-fit section; 03. Terminal post.

[0025] 1. First insulating component,

[0026] 101. Third through hole; 102. First through hole.

[0027] 2. Second insulating component,

[0028] 201. Second through hole; 202. Connecting bottom edge; 203. Connecting side edge; 204. Protective top edge.

[0029] 3. Pole post,

[0030] 4. Explosion-proof valve

[0031] 5. Shell,

[0032] 6. Pressing section. Detailed Implementation

[0033] This utility model discloses a battery cover assembly, which achieves reliable insulation protection for the terminals, improves the impact resistance of the insulation components, and provides better protection for the battery.

[0034] This utility model also discloses a battery.

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] See Figures 2 to 10 The present invention discloses a battery cover assembly, comprising a cover body and a terminal post assembly. The terminal post assembly includes a terminal post 3 and a pressing part 6. The terminal post 3 protrudes from the cover body, and the pressing part 6 is integrally formed with the cover body. The pressing part 6 is pressed onto the surface of the terminal post 3 away from the cover body. An insulating element is provided on the cover body. The insulating element includes a first insulating element 1 and a second insulating element 2. The first insulating element 1 is disposed on the surface of the cover body, and the second insulating element 2 includes a convex structure that covers the terminal post assembly. The elongation at break of the second insulating element 2 is greater than that of the first insulating element 1.

[0037] Elongation at break is a physical property parameter that measures a material's toughness, ductility, and plasticity. The formula is: Elongation at break = [(Length after fracture - Original length) ÷ Original length] × 100%. A higher elongation at break indicates better ductility and toughness in the material.

[0038] In the battery cover assembly of this invention, the elongation at break of the second insulating member 2 is greater than that of the first insulating member 1, so that the second insulating member 2 can form a convex structure to achieve insulation protection for the terminal post. The elongation at break of the first insulating member 1 is less than that of the second insulating member 2. A portion of the first insulating member 1 is positioned opposite to the middle of the battery cell. In this way, when the battery is charging and discharging, the first insulating member 1 can better withstand the impact force of the gas heat when it impacts the cover body, making the first insulating member 1 less prone to deformation. By controlling the elongation at break of the first insulating member 1, the impact resistance of the first insulating member 1 is improved, the fit between the first insulating member 1 and the cover body is improved, and the insulation effect of the first insulating member 1 is better.

[0039] To reduce the molding difficulty of the second insulating component 2 and improve the impact resistance of the first insulating component 1, the ratio of the elongation at break of the second insulating component 2 to the elongation at break of the first insulating component 1 is 60-380. Furthermore, the elongation at break of the first insulating component 1 is 0.2% to 5%, and the elongation at break of the second insulating component 2 is 50% to 80%.

[0040] To improve the heat insulation effect, the heat resistance temperature of the first insulating component 1 is not less than 200℃, so as to prevent the thermal runaway battery from affecting adjacent batteries. Preferably, the heat resistance temperature of the first insulating component 1 is 400℃-900℃.

[0041] To facilitate the penetration of the pole post 3, a first through hole 102 is provided on the first insulating component 1, such as... Figure 7As shown, the terminal post 3 is disposed at the position of the first through hole 102. Since a battery generally has two terminals 3, there are correspondingly two first through holes 102. To achieve insulation of the pressing part 6 at the position of the terminal post 3, a second insulating member 2 is connected to the position of the first through hole 102 to cover the pressing part 6. Since the terminal post 3 is generally cylindrical, the first through hole 102 is preferably a circular hole, and the second insulating member 2 is preferably a cylindrical shell. In other embodiments, the first through hole 102 may also be of other shapes, which are not limited here.

[0042] To facilitate the connection of the second insulating member 2, the second insulating member 2 includes a connecting bottom edge 202, such as... Figure 8 and Figure 9 As shown, the connecting bottom edge 202 is used to connect with the first insulating member 1. The second insulating member 2 also includes a protective top edge 204 and a connecting side edge 203, with the connecting bottom edge 202 and the protective top edge 204 connected via the connecting side edge 203. The connecting side edge 203 surrounds the side of the pressing portion 6 on the pole post 3, and the protective top edge 204 is correspondingly disposed on the top surface of the pressing portion 6, pressing the protective top edge 204 against the top of the pressing portion 6. To avoid affecting the normal use of the pole post 3, a second through hole 201 for the pole post 3 to pass through is provided at the center of the protective top edge 204.

[0043] To prevent the first insulating component 1 from affecting the use of the explosion-proof valve 4, a third through hole 101 is also provided on the first insulating component 1, such as... Figure 7 As shown, the third through hole 101 is correspondingly positioned to the edge of the explosion-proof valve 4. To facilitate the replenishment of electrolyte to the battery, a fourth through hole (not shown in the figure) is also provided on the first insulating component 1. The fourth through hole is correspondingly positioned to the liquid injection hole on the cover plate to facilitate the addition of electrolyte to the battery.

[0044] In one embodiment, the connecting bottom edge 202 is partially overlapped with the first insulating member 1. Specifically, the outer edge of the connecting bottom edge 202 is larger than the edge of the first through hole 102, and the connecting bottom edge 202 is connected to the position of the first through hole 102. The connecting bottom edge 202 is connected to the first insulating member 1 or the cover plate body. When the connecting bottom edge 202 is connected to the first insulating member 1, the connecting bottom edge 202 can be located below the first insulating member 1, connected to the bottom surface of the first insulating member 1, such as... Figure 5 As shown, the connecting bottom edge 202 is bonded to the bottom surface of the first insulating member 1. Alternatively, the connecting bottom edge 202 is located above the first insulating member 1, as shown. Figure 6 As shown, the connecting bottom edge 202 is bonded to the top surface of the first insulating member 1. When the connecting bottom edge 202 is connected to the cover plate body, the connecting bottom edge 202 is bonded to the cover plate body.

[0045] In another embodiment, the connecting bottom edge 202 and the first insulating member 1 are not overlapped, but rather joined together. The outer edge of the connecting bottom edge 202 corresponds to the edge of the first through hole 102. This correspondence means that they have the same shape and size. The connecting bottom edge 202 is adhered to the sidewall of the first through hole 102. Compared to a connection method where the connecting bottom edge 202 and the first insulating member 1 partially overlap, the connection reliability in this embodiment is lower. Therefore, the connection method where the connecting bottom edge 202 and the first insulating member 1 partially overlap is preferred.

[0046] To ensure reliable bonding, the ratio of the outer edge dimension of the connecting bottom edge 202 to the edge dimension of the first through hole 102 is 1 to 2. A larger ratio results in a relatively larger bonding area between the connecting bottom edge 202 and the first insulating member 1, leading to higher bonding reliability. However, the ratio cannot be too large; excessively large ratios not only waste material but also compromise the thermal insulation of the first insulating member 1. Therefore, a distance is set between the edge of the connecting bottom edge 202 and the long side of the first insulating member 1 (i.e., the distance from the large surface of the battery). This distance is set by those skilled in the art based on actual needs.

[0047] To avoid affecting the normal use of the pole post 3, the surface of the protective top edge 204 away from the pressing part 6 is lower than the top surface of the pole post 3 by a first distance H1, such as... Figure 10 As shown, the first distance H1 is 0.2–2 mm. To facilitate the installation of the entire insulation structure and reduce the requirements for manufacturing precision, a second distance H2 is placed between the surface of the connecting side 203 near the pole post 3 and the side of the pressing part 6, as shown. Figure 10 As shown, the second distance H2 is 0.2 to 1 mm. During installation, the second insulating component 2 is first bonded to the first through hole 102 of the first insulating component 1, and then the entire insulating component is connected to the cover plate body.

[0048] Furthermore, the heat resistance temperature of the first insulating component 1 is higher than that of the second insulating component 2. By setting the heat resistance temperature of the first insulating component 1 to be higher than that of the second insulating component 2, even if the second insulating component 2 burns when the battery experiences thermal runaway, the higher heat resistance temperature of the first insulating component 1 ensures better thermal isolation and prevents it from burning through, thereby reducing the probability of thermal runaway in adjacent batteries. The first insulating component 1 can be a mica board, asbestos board, or quartz board to ensure good thermal isolation performance and hardness. The second insulating component 2 can be made of PVC to reduce the difficulty of molding. Since the long-term temperature resistance of mica is 700-750℃ and the instantaneous temperature is above 1000℃, the first insulating component 1 is preferably a mica board.

[0049] The battery cover assembly of this utility model, by setting a second insulating member 2 with high elongation at break, facilitates the molding into a convex structure that insulates the press-fit part 6, thereby achieving insulation of the terminal post 3; and by setting a first insulating member 1 with low elongation at break and high heat resistance, it meets the requirements of heat insulation performance and strength, thereby reducing the risk that thermal runaway of one battery will cause thermal runaway of adjacent batteries after the batteries are assembled.

[0050] This utility model also provides a battery, such as Figure 11 As shown, it includes a housing 5 and a cover assembly. The battery cell is placed inside the housing 5, and the cover assembly is connected to the top opening of the housing 5. The cover assembly is the battery cover assembly described above.

[0051] In the description of this solution, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cover assembly, characterized in that, The device includes a cover plate body and an electrode assembly. The electrode assembly includes an electrode and a pressing part. The electrode protrudes from the cover plate body. The pressing part is integrally formed with the cover plate body. The pressing part is partially pressed onto the surface of the electrode away from the cover plate body. An insulating element is provided on the cover plate body. The insulating element includes a first insulating element and a second insulating element. The first insulating element is disposed on the surface of the cover plate body. The second insulating element includes a convex structure that surrounds the electrode assembly. The elongation at break of the second insulating element is greater than the elongation at break of the first insulating element.

2. The battery cover assembly according to claim 1, characterized in that, The ratio of the elongation at break of the second insulating component to the elongation at break of the first insulating component is 60-380.

3. The battery cover assembly according to claim 1 or 2, characterized in that, The first insulating component has an elongation at break of 0.2% to 5%, and the second insulating component has an elongation at break of 50% to 80%.

4. The battery cover assembly according to claim 1 or 2, characterized in that, The heat resistance temperature of the first insulating component is not less than 200℃.

5. The battery cover assembly according to claim 1, characterized in that, The first insulating member is provided with a first through hole for setting the pole post, and the second insulating member is connected to the position of the first through hole.

6. The battery cover assembly according to claim 5, characterized in that, The second insulating member includes a connecting bottom edge and a protective top edge, which are connected by a connecting side. The connecting bottom edge is connected to the first insulating member, and the connecting side is arranged around the side of the pole post. The protective top edge is at least partially corresponding to the pressing part, and the protective top edge is pressed against the top of the pressing part. The second insulating member is provided with a second through hole for mounting the pole post.

7. The battery cover assembly according to claim 6, characterized in that, The outer edge of the connecting bottom edge is larger than the edge of the first through hole, and the connecting bottom edge is connected to the first insulating component or the cover plate body; The bottom edge of the connection is located below the first insulating element; Alternatively, the bottom edge of the connection may be located above the first insulating element.

8. The battery cover assembly according to claim 7, characterized in that, The bottom edge of the connection is bonded to the first insulating component or the cover plate body.

9. The battery cover assembly according to claim 6, characterized in that, The ratio of the outer edge dimension of the connecting bottom edge to the edge dimension of the first through hole is 1 to 2.

10. The battery cover assembly according to claim 6, characterized in that, The outer edge of the connecting bottom edge is correspondingly disposed to the edge of the first through hole, and the connecting bottom edge is connected to the side wall of the first through hole.

11. The battery cover assembly according to claim 6, characterized in that, The protective top edge is located away from the pressing part at a first distance H1, which is 0.2 to 2 mm below the top surface of the pole.

12. The battery cover assembly according to claim 6, characterized in that, The second distance H2 is 0.2 to 1 mm between the side of the connecting side near the pole post and the side of the pressing part.

13. The battery cover assembly according to claim 1, characterized in that, The heat resistance temperature of the first insulating component is greater than that of the second insulating component.

14. A battery comprising a casing and a cover assembly, wherein a battery cell is disposed within the casing, and the cover assembly is connected to a top opening of the casing, characterized in that, The cover assembly is the battery cover assembly according to any one of claims 1-13.

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