Battery cover plate assembly and single battery
By designing vents and air channels in the battery cover assembly, the problem of poor gas release in secondary batteries under abnormal conditions is solved, enabling timely discharge of gas inside the battery and improving battery safety and reliability.
Patent Information
- Application Number
- CN202422933941.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2034-11-29
AI Technical Summary
Existing secondary batteries may experience poor gas venting under abnormal conditions, leading to increased internal pressure and posing a risk of rupture or explosion, thus affecting safety.
Design a battery cover assembly, comprising a top cover body and an insulating component. The insulating component is provided with vent holes and air guiding channels, and the support part is provided with a through channel to form a complete gas flow path, ensuring that gas can be discharged in a timely manner.
It improves the efficiency of gas flow inside the battery, ensures the timeliness and stability of valve opening and pressure relief, avoids cell weld tearing or explosion caused by untimely pressure relief, and enhances battery reliability.
Smart Images
Figure CN223871565U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery cover assembly and a single battery cell. Background Technology
[0002] With the rapid development of electric vehicles and renewable energy storage systems, the application of secondary batteries is becoming increasingly widespread. However, there are still some shortcomings in their design, which pose certain safety risks.
[0003] Existing secondary batteries typically incorporate a lower insulator within the cover assembly, with multiple protrusions on this insulator to support the electrode assembly and prevent movement. When an abnormal reaction occurs, a large amount of gas rapidly accumulates internally, causing an increase in internal pressure. Gas production on the sides is blocked by the protrusions of the lower insulator, preventing timely gas release and reducing venting efficiency. This obstructed venting not only further increases internal pressure but can also lead to battery casing rupture or explosion, seriously threatening user safety. Therefore, an improved design is urgently needed to ensure unobstructed venting of secondary batteries under abnormal conditions, thereby reducing the risk of explosion and improving overall battery safety. Utility Model Content
[0004] The purpose of this invention is to design a battery cover assembly and a single battery cell that can increase the efficiency of gas release inside the battery.
[0005] To achieve the above objectives, this utility model provides a battery cover assembly, comprising: a top cover body and an insulating component. The insulating component has a first side and a second side disposed opposite to each other along a first direction. The top cover body is connected to the first side. An explosion-proof valve is provided on the top cover body. A vent hole is provided on the insulating component opposite to the explosion-proof valve. Support portions for abutting against an electrode assembly are respectively protruding on both sides of the second side in a second direction. A receiving cavity is formed between the second side and the two support portions. A venting channel is provided on the support portion, penetrating both sides of the second direction. The venting channel communicates with the vent hole through the receiving cavity. The first direction and the second direction are perpendicular to each other.
[0006] Furthermore, the second side is also provided with a contact portion for abutting against the electrode assembly. The contact portion is located between the two support portions, and the contact portion divides the receiving cavity into two sub-cavities, each for accommodating the connecting piece. The vent hole is opened on the contact portion, and the two sub-cavities are respectively connected to the vent hole.
[0007] Furthermore, the abutting portion includes a first abutting member, a protective plate, and a second abutting member connected sequentially along a third direction. The first abutting member and the second abutting member both protrude relative to the protective plate on the side away from the cover plate in the first direction, so that the first abutting member, the protective plate, and the second abutting member enclose and form a gathering area. The vent hole is opened on the protective plate, and both sub-cavities are connected to the vent hole through the gathering area. The third direction, the first direction, and the second direction are perpendicular to each other.
[0008] Furthermore, the protective plate is installed on the explosion-proof valve.
[0009] Furthermore, the insulating component has a plurality of ventilation holes arranged in a row.
[0010] Furthermore, the support portion has multiple air guide channels, which are arranged at intervals along the third direction.
[0011] Furthermore, the explosion-proof valve is located in the middle of the top cover body in the first direction and the second direction.
[0012] This application also provides a single battery cell, including a housing, an electrode assembly, a connecting piece, and the aforementioned battery cover assembly. The housing has an opening on one side along the first direction, and the top cover body covers the opening. The insulating member, the electrode assembly, and the connecting piece are sequentially disposed within the housing along the first direction, and the electrode assembly is connected to the insulating member through the connecting piece.
[0013] Furthermore, the electrode assembly has ventilation cavities formed between its two sides in the second direction and the inner wall of the housing, and the air guide channel communicates with the ventilation cavities.
[0014] Furthermore, a ventilation channel is formed between the electrode assembly and the inner wall of the housing on the side opposite to the opening in the first direction, and the ventilation channel communicates with the ventilation cavity.
[0015] Compared with the prior art, the battery cover assembly and single battery of this utility model have the following advantages:
[0016] The battery cover assembly and individual battery cells of this utility model, by opening a venting channel on the support portion, allow the gas inside the battery to be discharged promptly through the venting channel and vent holes from the explosion-proof valve when gas leaks. This increases the gas flow efficiency inside the battery, ensures the timeliness and stability of valve opening for pressure relief, and avoids tearing of the cell welds or even explosion due to untimely pressure relief. The individual battery cells of this application effectively avoid the safety hazards caused by gas accumulation and enhance battery reliability. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of the battery cover assembly according to an embodiment of the present utility model;
[0018] Figure 2 This is an exploded view of the battery cover assembly according to an embodiment of the present utility model;
[0019] Figure 3 This is a schematic diagram of the structure of the insulating component in the battery cover assembly according to an embodiment of the present utility model;
[0020] Figure 4 This is a partial cross-sectional view of a single battery cell according to an embodiment of the present invention;
[0021] Figure 5 This is an exploded view of a single battery cell according to an embodiment of the present invention.
[0022] In the diagram, 1. Top cover body; 11. Explosion-proof valve; 2. Insulating component; 20. Receiving cavity; 200. Sub-receiving cavity; 21. First side surface; 22. Second side surface; 23. Vent hole; 24. Support part; 241. Air guide channel; 25. Abutting part; 250. Collection area; 251. First abutting component; 252. Second abutting component; 253. Protective plate; 3. Shell; 31. Opening; 4. Electrode assembly; 5. Connecting piece; 6. Ventilation cavity; 7. Ventilation channel;
[0023] x, first direction; y, second direction; z, third direction. Detailed Implementation
[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0026] In the description of this utility model, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0027] In this invention, terms such as "first" and "second" are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.
[0028] In the description of this utility model, the first direction, the second direction, and any two of the second directions are perpendicular or approximately perpendicular to each other.
[0029] Reference Figure 1 and Figure 2 A battery cover assembly according to an embodiment of the present invention includes: a top cover body 1 and an insulating member 2. The insulating member 2 has a first side surface 21 and a second side surface 22 arranged opposite to each other along a first direction x. The top cover body 1 is connected to the first side surface 21. An explosion-proof valve 11 is provided on the top cover body 1. A vent hole 23 is provided on the insulating member 2 opposite to the explosion-proof valve 11. The second side surface 22 has support portions 24 protruding on both sides in the second direction y for abutting against an electrode assembly 4. A receiving cavity 20 is formed between the second side surface 22 and the two support portions 24. A venting channel 241 is provided on the support portion 24, penetrating both sides in the second direction y. The venting channel 241 communicates with the vent hole 23 through the receiving cavity 20. The first direction x and the second direction y are perpendicular to each other.
[0030] The support portion 24 protrudes to abut against the electrode assembly 4, ensuring the stability of the battery's internal structure. It also ensures that a receiving cavity 20 is formed between the electrode assembly 4 and the second side 22, which can accommodate electrode tabs, connecting pieces 5, etc., and provides space for gases generated during testing or abnormal conditions. A through-hole is provided on the support portion 24 to form a side air guide channel 241, connecting the receiving cavity 20 to the periphery of the electrode assembly 4. This allows gas to flow from the periphery of the electrode assembly 4 sequentially through the air guide channel 241, the receiving cavity 20, and the vent 23 to the explosion-proof valve 11, forming a complete gas flow path. When the internal pressure of the battery increases, the gas flows through the vent 23 and connects to the explosion-proof valve 11 to the outside, increasing the gas flow efficiency inside the battery, ensuring timely and stable valve opening for pressure relief, and preventing cell weld tearing or even explosion due to untimely pressure relief. This solution avoids the safety hazards caused by gas accumulation and enhances battery reliability.
[0031] In some embodiments of this application, the second side 22 is further provided with an abutting portion 25 for abutting against the electrode assembly 4. The abutting portion 25 is located between the two support portions 24, and the abutting portion 25 divides the receiving cavity 20 into two sub-cavities 200, each for accommodating the connecting piece 5. The vent hole 23 is opened on the abutting portion 25, and the two sub-cavities 200 are respectively connected to the vent hole 23.
[0032] The abutment portion 25 is located between the two support portions 24, which can reduce the gap between the electrode assembly 4 and the second side 22 and improve the overall stability of the battery. The receiving cavity 20 is divided into two sub-cavities 200. By placing the connecting piece 5 in the two sub-cavities 200 respectively, the connecting piece 5 can be effectively prevented from breaking or falling off when subjected to force or vibration, thereby improving the overall reliability of the battery. The vent 23 is opened on the abutment portion 25 to ensure that the gas inside the battery can pass smoothly through the vent 23, avoiding problems such as gas accumulation leading to increased pressure.
[0033] In some embodiments of this application, the abutting portion 25 includes a first abutting member 251, a protective plate 253, and a second abutting member 252 connected sequentially along a third direction z. The first abutting member 251 and the second abutting member 252 both protrude from the protective plate 253 on the side away from the cover plate in the first direction x, so that the first abutting member 251, the protective plate 253, and the second abutting member 252 enclose and form a gathering area 250. The vent hole 23 is opened on the protective plate 253, and both of the sub-cavities 200 are connected to the vent hole 23 through the gathering area 250. The third direction z, the first direction x, and the second direction y are perpendicular to each other.
[0034] By designing the protrusion height of the first abutment 251 and the second abutment 252 to be much higher than the protrusion height of the protective plate 253, the gas is contained in the collection area 250 formed by the step difference, which facilitates the gas to collect and impact the explosion-proof valve 11. When the internal gas pressure reaches the preset pressure range of the explosion-proof valve 11, the valve is opened to release pressure.
[0035] In some embodiments of this application, the protective plate 253 covers the explosion-proof valve 11. The protective plate 253 is designed with a protrusion of a certain height to be spaced apart from the explosion-proof valve 11, forming an isolation and protection function for the explosion-proof valve 11. This can block corrosive substances that may be generated inside the battery, preventing them from contacting the explosion-proof valve 11 and causing it to fail. At the same time, the protective plate 253 also plays a certain role in heat insulation, preventing the explosion-proof valve 11 from being directly subjected to thermal shock when the internal temperature of the battery is too high, thereby protecting the sealing performance and operational reliability of the explosion-proof valve 11. In a specific embodiment of this application, the protective plate 253, the first abutment member 251, the second abutment member 252, and the insulator are integrated into one piece.
[0036] In some embodiments of this application, the insulating member 2 has a plurality of ventilation holes 23 arranged in an array. Specifically, the ventilation holes 23 are all located on the protective plate 253, forming a mesh-like protective structure.
[0037] In some embodiments of this application, the support portion 24 has multiple air guide channels 241, which are arranged at intervals along the third direction z. The multiple air guide channels 241 are provided to improve the gas emission efficiency from the side of the electrode assembly 4.
[0038] In some embodiments of this application, the explosion-proof valve 11 is located at the midpoint of the top cover body 1 in the first direction x and the second direction y. Placing the explosion-proof valve 11 at the center of the top cover body 1 helps to evenly discharge the gas generated inside the battery, reducing the risk of excessive local pressure and thus reducing the possibility of explosion.
[0039] This application also provides an embodiment of a single-cell battery, including a housing 3, an electrode assembly 4, a connecting piece 5, and the aforementioned battery cover assembly. The housing 3 has an opening 31 on one side along the first direction x, and the top cover body 1 covers the opening 31. The insulating member 2, the electrode assembly 4, and the connecting piece 5 are sequentially disposed within the housing 3 along the first direction x. The electrode assembly 4 is connected to the insulating member 2 through the connecting piece 5. The electrode assembly 4 and the insulating member 2 enclose a receiving cavity 20 for accommodating the connecting piece 5 and gas generated during testing or abnormal conditions.
[0040] In some embodiments of this application, the electrode assembly 4 has ventilation chambers 6 spaced apart from the inner wall of the housing 3 on both sides in the second direction y, and the air guiding channel 241 communicates with the ventilation chambers 6. Gas on the side of the electrode assembly 4 can pass through the ventilation chambers 6, be collected in the collection area 250 through the air guiding channel 241 on the insulating member 2, and then be discharged from the explosion-proof valve 11 through the vent 23.
[0041] In some embodiments of this application, a venting channel 7 is formed between the electrode assembly 4 and the inner wall of the housing 3 on the side facing away from the opening 31 in the first direction x, and the venting channel 7 communicates with the venting cavity 6. Gas and liquid at the bottom of the electrode assembly 4 can move upward through the venting cavity 6 on the side of the electrode assembly 4, then pass through the air guide channel 241 to the receiving cavity 20 and gather in the collection area 250, and then be discharged from the explosion-proof valve 11, thereby improving the pressure relief efficiency of the single battery.
[0042] In summary, this utility model embodiment provides a battery cover assembly and a single battery cell. The support portion 24 of the insulating component 2 has a through-hole forming a gas channel 241. The electrode assembly 4 and the side and bottom surfaces of the housing 3 respectively form a venting cavity 6 and a venting channel 7, which are used to accelerate the accumulation of gas from the side and bottom of the electrode assembly 4 to the pressure relief collection area 250, improve the gas relief efficiency, thereby enhancing the pressure relief efficiency of the single battery cell during pressure relief and improving the reliability of the single battery cell.
[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A battery cover assembly, characterized in that, include: The top cover body and the insulating component are provided. The insulating component has a first side and a second side that are arranged opposite to each other along a first direction. The top cover body is connected to the first side and is provided with an explosion-proof valve. The insulating component has a vent hole that is arranged opposite to the explosion-proof valve. The second side has support portions that protrude on both sides in a second direction for abutting against the electrode assembly. A receiving cavity is formed between the second side and the two support portions. The support portions have air guiding channels that pass through both sides in the second direction. The air guiding channels communicate with the vent hole through the receiving cavity. The first direction and the second direction are perpendicular to each other.
2. The battery cover assembly as described in claim 1, characterized in that, The second side is also provided with a contact portion for abutting against the electrode assembly. The contact portion is located between the two support portions and divides the receiving cavity into two sub-cavities for accommodating the connecting piece. The vent hole is opened on the contact portion, and the two sub-cavities are respectively connected to the vent hole.
3. The battery cover assembly as described in claim 2, characterized in that, The abutting portion includes a first abutting member, a protective plate, and a second abutting member connected sequentially along a third direction. The first abutting member and the second abutting member both protrude from the protective plate on the side away from the cover plate in the first direction, so that the first abutting member, the protective plate, and the second abutting member enclose and form a gathering area. The vent is opened on the protective plate, and both sub-cavities are connected to the vent through the gathering area. The third direction, the first direction, and the second direction are perpendicular to each other.
4. The battery cover assembly as described in claim 3, characterized in that, The protective plate is installed on the explosion-proof valve.
5. The battery cover assembly as described in claim 1, characterized in that, The insulating component has multiple vent holes arranged in a row.
6. The battery cover assembly as described in claim 3, characterized in that, The support portion has multiple air guide channels, which are arranged at intervals along the third direction.
7. The battery cover assembly as described in claim 2, characterized in that, The explosion-proof valve is located in the middle of the top cover body in the first direction and / or the second direction.
8. A single-cell battery, characterized in that, The device includes a housing, an electrode assembly, a connecting piece, and a battery cover assembly as described in any one of claims 1 to 7. The housing has an opening on one side along the first direction, and the top cover body covers the opening. The insulating member, the electrode assembly, and the connecting piece are sequentially disposed within the housing along the first direction, and the electrode assembly is connected to the insulating member through the connecting piece.
9. The single-cell battery as described in claim 8, characterized in that, The electrode assembly has ventilation cavities formed between its two sides in the second direction and the inner wall of the housing, and the air guide channel communicates with the ventilation cavities.
10. The single-cell battery as described in claim 9, characterized in that, The electrode assembly has a ventilation channel between the side facing away from the opening in the first direction and the inner wall of the housing, and the ventilation channel is connected to the ventilation cavity.