Battery secondary short circuit prevention structure and battery

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to a secondary short circuit prevention structure of a battery, which comprises a shell, a pole and an insulation sealing assembly. Wherein a through hole is formed in the shell, the pole is riveted to the through hole, a high-temperature-resistant insulating layer is arranged on the side wall of the pole, and at least part of the insulating sealing assembly is clamped between the high-temperature-resistant insulating layer and the shell. By arranging the high-temperature-resistant insulating layer on the side wall of the pole, insulation between the pole and the through hole of the shell can still be guaranteed when the insulating sealing assembly is melted at a high temperature, secondary short circuit can be prevented, and safety is improved. The utility model provides a battery which comprises a battery cell and the secondary short circuit prevention structure of the battery, and the battery cell is positioned in the shell. The battery is helpful for preventing secondary short circuit and improving safety.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage equipment, in particular to a battery secondary short circuit prevention structure and a battery. Background Art

[0002] Once thermal runaway (such as short circuit) occurs in the battery cells inside the new energy battery, high heat will be generated. When the high heat is transferred to the pole, the outer plastic and / or inner plastic will melt, which may cause the positive and negative poles to short-circuit, causing a secondary short circuit. Utility Model Content

[0003] One purpose of the utility model is to provide a battery secondary short circuit prevention structure, which can help prevent secondary short circuit.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] Provided is a battery secondary short circuit prevention structure, comprising:

[0006] A shell, wherein a through hole is formed in the shell;

[0007] A pole, the pole being riveted to the through hole, and a high-temperature resistant insulating layer being provided on a side wall of the pole;

[0008] An insulating sealing assembly is at least partially sandwiched between the high-temperature resistant insulating layer and the shell.

[0009] Optionally, the electrode comprises a first portion, the first portion is located inside the battery, and an end surface of the first portion is electrically connected to a tab of the battery cell;

[0010] The high temperature resistant insulating layer includes a first high temperature resistant insulating layer, which is located on the end surface of the first part facing away from the interior of the battery, and / or the first high temperature resistant insulating layer is located on the side wall of the first part.

[0011] Optionally, the insulating sealing assembly includes inner plastic, and the inner plastic portion is sandwiched between an end surface of the first portion facing away from the interior of the battery and a wall surface of the outer shell facing the interior of the battery.

[0012] Optionally, the pole includes a second portion, the second portion is inserted into the through hole, and the high-temperature resistant insulation layer includes a second high-temperature resistant insulation layer, and the second high-temperature resistant insulation layer is located on a side wall of the second portion.

[0013] Optionally, the insulating sealing assembly includes inner plastic, and the inner plastic portion is sandwiched between the side wall of the second portion and the inner wall of the through hole.

[0014] Optionally, the pole includes a third portion, the third portion is located outside the battery, and an end surface of the third portion is used for electrical connection with the outside world;

[0015] The high temperature resistant insulating layer includes a third high temperature resistant insulating layer, which is located on the end surface of the third part facing the interior of the battery, and / or the third high temperature resistant insulating layer is located on the side wall of the third part.

[0016] Optionally, the insulating sealing assembly includes a sealing ring and an outer plastic, the sealing ring is clamped between the end surface of the third part facing the interior of the battery and the wall surface of the outer shell facing away from the interior of the battery, and the outer plastic part is clamped between the end surface of the third part facing the interior of the battery and the wall surface of the outer shell facing away from the interior of the battery.

[0017] Optionally, the thickness of the high temperature resistant insulation layer is greater than 0.01 mm;

[0018] And / or, the high temperature resistant insulating layer is an aluminum oxide layer formed by electroplating.

[0019] Optionally, the housing includes a cover plate and a shell, and the pole is riveted to the through hole of the cover plate, or the pole is riveted to the through hole of the shell.

[0020] Another object of the present invention is to provide a battery that can help prevent secondary short circuits.

[0021] To achieve this purpose, the present invention adopts the following technical solutions:

[0022] Provided is a battery, comprising a battery core and the above-mentioned battery secondary short circuit prevention structure, wherein the battery core is located in the housing.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides a battery secondary short-circuit prevention structure, comprising a housing, a terminal, and an insulating seal assembly. The housing has a through-hole, to which the terminal is riveted. A high-temperature-resistant insulating layer is provided on the sidewalls of the terminal, and the insulating seal assembly is at least partially sandwiched between the high-temperature-resistant insulating layer and the housing. By providing the high-temperature-resistant insulating layer on the sidewalls of the terminal, insulation between the terminal and the housing through-hole is maintained even when the insulating seal assembly melts at high temperatures, thereby helping to prevent secondary short circuits and improve safety.

[0025] The utility model provides a battery, comprising a battery core and the above-mentioned battery secondary short circuit prevention structure, wherein the battery core is located in a housing. The battery can help prevent secondary short circuits and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1This is a schematic diagram of the structure of the battery provided by the embodiment of the utility model Figure 1 ;

[0027] Figure 2 This is an exploded view of a battery provided by an embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the battery provided by the embodiment of the utility model Figure 2 ;

[0029] Figure 4 yes Figure 3 Middle AA section view;

[0030] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0031] In the picture:

[0032] 1. Shell; 2. Pole; 21. First part; 211. First high-temperature resistant insulation layer; 22. Second part; 221. Second high-temperature resistant insulation layer; 23. Third part; 231. Third high-temperature resistant insulation layer;

[0033] 3. Inner plastic; 4. Sealing ring; 5. Outer plastic. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention, and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of it.

[0035] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] Once thermal runaway (such as short circuit) occurs in the battery cells inside the new energy battery, high heat will be generated. When the high heat is transferred to the pole, the outer plastic and / or inner plastic will melt, which may cause the positive and negative poles to short-circuit, causing a secondary short circuit.

[0038] Therefore, this embodiment provides a battery secondary short circuit prevention structure to prevent the occurrence of secondary short circuit.

[0039] like Figure 1-Figure 5 As shown, the battery secondary short-circuit prevention structure of this embodiment includes a housing, a terminal 2, and an insulating seal assembly. The housing has a through-hole, to which the terminal 2 is riveted. The sidewalls of the terminal 2 are provided with a high-temperature-resistant insulating layer, and the insulating seal assembly is at least partially sandwiched between the high-temperature-resistant insulating layer and the housing. By providing the high-temperature-resistant insulating layer on the sidewalls of the terminal 2, insulation between the terminal 2 and the through-hole of the housing is maintained even when the insulating seal assembly melts at high temperatures, thereby helping to prevent secondary short circuits and improve safety.

[0040] Optionally, the high-temperature resistant insulating layer is an aluminum oxide layer formed by electroplating. Aluminum oxide has good insulating properties and can withstand high temperatures. The aluminum oxide layer formed by electroplating can ensure structural strength and connection strength.

[0041] like Figure 5As shown, optionally, the terminal 2 includes a first portion 21, which is located within the battery. The end surface of the first portion 21 is electrically connected to the battery cell tab. The high-temperature resistant insulating layer includes a first high-temperature resistant insulating layer 211. The first high-temperature resistant insulating layer 211 is located on the end surface of the first portion 21 facing away from the battery interior. This ensures that when the insulating seal assembly melts, insulation is still maintained between the end surface of the first portion 21 facing away from the battery interior and the wall surface of the outer shell facing the battery interior. Optionally, the first high-temperature resistant insulating layer 211 is located on the side wall of the first portion 21 to ensure that the side surface of the first portion 21 does not contact the outer shell and short-circuit. In this embodiment, the first high-temperature resistant insulating layer 211 is provided on both the end surface of the first portion 21 facing away from the battery interior and the side wall of the first portion 21. Of course, in other embodiments, the first high-temperature resistant insulating layer 211 can be provided only on the end surface of the first portion 21 facing away from the battery interior, or only on the side wall of the first portion 21, both of which can help prevent secondary short circuits.

[0042] Optionally, the pole 2 includes a second portion 22, which is inserted into the through-hole. The high-temperature-resistant insulation layer includes a second high-temperature-resistant insulation layer 221, which is located on the sidewalls of the second portion 22 to prevent the insulating seal assembly from melting at high temperatures and causing a short circuit between the sidewalls of the second portion 22 and the sidewalls of the through-hole. It is understood that at high temperatures, even partial melting of the insulating seal assembly may cause the position of the pole 2 relative to the housing to change, increasing the risk of a secondary short circuit.

[0043] Optionally, the pole 2 includes a third part 23, the third part 23 is located outside the battery, and the end face of the third part 23 is used to electrically connect to the outside world. Optionally, the first part 21, the second part 22 and the third part 23 are connected in sequence along the axial direction of the pole 2, and the diameter of the first part 21 is larger than the diameter of the second part 22, and the diameter of the third part 23 is larger than the diameter of the second part 22, so as to ensure that the pole 2 does not break away from the through hole of the shell. Optionally, the first part 21 is a riveted deformation part, or the third part 23 is a riveted deformation part, which is not limited here. The tight connection between the pole 2 and the shell can be ensured by riveting, and relative displacement between the two can be prevented. It is known that it is necessary to first electroplate a high-temperature resistant insulating layer on the outer wall of the pole 2, and then rivet the pole 2 onto the shell.

[0044] The high temperature resistant insulating layer includes a third high temperature resistant insulating layer 231, which is located on the end surface of the third part 23 facing the interior of the battery to prevent a short circuit between the end surface of the third part 23 facing the interior of the battery and the wall surface of the outer shell facing the interior of the battery. Since the outer shell may be deformed at high temperatures, the third high temperature resistant insulating layer 231 is optionally located on the side wall of the third part 23 to prevent the side wall of the third part 23 from contacting and short-circuiting with the deformed outer shell. In this embodiment, the third high temperature resistant insulating layer 231 is provided on both the end surface of the third part 23 facing the interior of the battery and the side wall of the third part 23. Of course, in other embodiments, the third high temperature resistant insulating layer 231 may be provided only on the end surface of the third part 23 facing the interior of the battery, or only on the side wall of the third part 23, both of which can help prevent secondary short circuits.

[0045] like Figure 2 and Figure 5 As shown, optionally, the insulating sealing assembly includes an inner plastic 3, which is sleeved on the second part 22, and the inner plastic 3 includes an annular sheet structure, which is sandwiched between the end surface of the first part 21 facing away from the interior of the battery and the wall surface of the outer shell facing the interior of the battery to ensure insulation between the pole 2 and the outer shell at this point.

[0046] Optionally, the inner plastic 3 further includes a tubular structure, which is sandwiched between the side wall of the second portion 22 and the inner wall of the through hole to ensure insulation between the pole 2 and the shell at this location, and helps to fix the radial position of the pole 2 relative to the through hole. When the material of the inner plastic 3 has a certain elasticity, the interference fit of the inner plastic 3 between the pole 2 and the shell can have a certain sealing function.

[0047] Optionally, the insulating sealing assembly further includes a sealing ring 4 and an outer plastic 5. The sealing ring 4 is sleeved on the second part 22, and the sealing ring 4 is clamped between the end face of the third part 23 facing the interior of the battery and the wall surface of the shell facing away from the interior of the battery. On the one hand, it can block the gap between the second part 22 and the inner wall of the through hole, and on the other hand, it can ensure the insulation state of the pole 2 and the shell at this point.

[0048] Optionally, the outer plastic 5 is partially sandwiched between the end surface of the third portion 23 facing the battery interior and the wall surface of the outer shell facing away from the battery interior to prevent short circuits between the end surface of the third portion 23 facing the battery interior and the wall surface of the outer shell facing away from the battery interior. This portion of the outer plastic 5 is an annular sheet structure. The outer plastic 5 also includes a tubular structure that is connected to the outer ring of the annular sheet structure and extends toward the exterior of the battery to provide a certain degree of wrapping and spacing for the third portion 23 of the terminal 2.

[0049] Optionally, the thickness of the high temperature resistant insulation layer is greater than 0.01 mm to ensure its insulation performance. Of course, the thickness value also needs to be comprehensively considered in terms of cost and occupied space.

[0050] Optionally, the outer shell includes a cover plate and a shell 1, and the pole 2 is riveted to the through hole of the cover plate, or the pole 2 is riveted to the through hole of the shell 1. In this embodiment, the pole 2 is riveted to the through hole of the shell 1. The shell 1 is a steel shell and is conductive with the negative electrode, and the pole 2 is conductive with the positive electrode tab of the battery cell. Of course, in other embodiments, the shell 1 can also be conductive with the positive electrode, and the pole 2 is the negative electrode. In other embodiments, the pole 2 can also be riveted to the through hole of the cover plate. In other embodiments, a high-temperature resistant insulating layer can also be provided on both the positive electrode and the negative electrode, or a high-temperature resistant insulating layer can be provided only on the positive electrode, or a high-temperature resistant insulating layer can be provided only on the negative electrode.

[0051] This embodiment also provides a battery comprising a cell and the aforementioned secondary short-circuit prevention structure, wherein the cell is located within a housing. In this embodiment, the battery is a cylindrical battery, but in other embodiments, a prismatic battery is also possible. This battery can help prevent secondary short circuits and improve safety.

[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery secondary short circuit prevention structure, characterized in that: include: A shell, wherein a through hole is formed in the shell; A pole (2), the pole (2) being riveted to the through hole, and a high-temperature resistant insulating layer being provided on a side wall of the pole (2); An insulating sealing assembly is at least partially sandwiched between the high-temperature resistant insulating layer and the shell.

2. The battery secondary short circuit prevention structure according to claim 1, characterized in that: The pole (2) comprises a first portion (21), the first portion (21) is located in the battery, and the end surface of the first portion (21) is electrically connected to the battery cell tab; The high-temperature resistant insulating layer comprises a first high-temperature resistant insulating layer (211), wherein the first high-temperature resistant insulating layer (211) is located on the end surface of the first part (21) facing away from the interior of the battery, and / or the first high-temperature resistant insulating layer (211) is located on the side wall of the first part (21).

3. The battery secondary short circuit prevention structure according to claim 2, characterized in that: The insulating sealing assembly comprises an inner plastic (3), wherein the inner plastic (3) is partially sandwiched between the end surface of the first portion (21) facing away from the interior of the battery and the wall surface of the outer shell facing the interior of the battery.

4. The battery secondary short circuit prevention structure according to claim 1, characterized in that: The pole (2) includes a second portion (22), the second portion (22) is inserted into the through hole, and the high-temperature resistant insulation layer includes a second high-temperature resistant insulation layer (221), and the second high-temperature resistant insulation layer (221) is located on the side wall of the second portion (22).

5. The battery secondary short circuit prevention structure according to claim 4, characterized in that: The insulating sealing assembly comprises an inner plastic (3), wherein the inner plastic (3) is partially sandwiched between the side wall of the second portion (22) and the inner wall of the through hole.

6. The battery secondary short circuit prevention structure according to any one of claims 1 to 5, characterized in that: The pole (2) includes a third portion (23), the third portion (23) is located outside the battery, and the end surface of the third portion (23) is used for electrical connection with the outside world; The high-temperature resistant insulating layer includes a third high-temperature resistant insulating layer (231), wherein the third high-temperature resistant insulating layer (231) is located on the end surface of the third part (23) facing the interior of the battery, and / or the third high-temperature resistant insulating layer (231) is located on the side wall of the third part (23).

7. The battery secondary short circuit prevention structure according to claim 6, characterized in that: The insulating sealing assembly comprises a sealing ring (4) and an outer plastic (5), wherein the sealing ring (4) is sandwiched between the end surface of the third portion (23) facing the interior of the battery and the wall surface of the outer shell facing away from the interior of the battery, and the outer plastic (5) is partially sandwiched between the end surface of the third portion (23) facing the interior of the battery and the wall surface of the outer shell facing away from the interior of the battery.

8. The battery secondary short circuit prevention structure according to any one of claims 1 to 5, characterized in that: The thickness of the high temperature resistant insulation layer is greater than 0.01 mm; And / or, the high temperature resistant insulating layer is an aluminum oxide layer formed by electroplating.

9. The battery secondary short circuit prevention structure according to any one of claims 1 to 5, characterized in that: The housing comprises a cover plate and a shell (1); the pole (2) is riveted to the through hole of the cover plate, or the pole (2) is riveted to the through hole of the shell (1).

10. A battery, characterized in that The invention comprises a battery core and a battery secondary short circuit prevention structure according to any one of claims 1 to 9, wherein the battery core is located in the housing.

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