An explosion-proof valve patch and battery

Abstract

This utility model discloses an explosion-proof valve patch and a battery, belonging to the field of battery technology. It addresses the technical problem in existing battery packs where, during long-term use, a single abnormal cell may swell, causing the explosion-proof valve to open and leak. However, the bulging of the explosion-proof valve is difficult to detect in a timely manner, posing a safety risk. This utility model provides an explosion-proof valve patch, installed on and covering the explosion-proof valve. It includes a pressure sensing layer, a circuit layer, and a sound-emitting layer. The pressure sensing layer is positioned close to the explosion-proof valve, the sound-emitting layer is positioned away from the explosion-proof valve, and the circuit layer is positioned between the pressure sensing layer and the sound-emitting layer. The pressure sensing layer, circuit layer, and sound-emitting layer are interconnected. This explosion-proof valve patch has an active warning function, emitting a buzzer alarm when the explosion-proof valve bulges, identifying the problematic battery cell in advance and reducing safety risks. This application also provides a battery, including the explosion-proof valve patch.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an explosion-proof valve patch and a battery. Background Technology

[0002] During long-term use of battery packs, a single abnormal cell bulging (such as overcharging, over-discharging, or internal short circuits causing electrolyte decomposition and gas production) may trigger the explosion-proof valve to open and leak, leading to safety issues such as thermal runaway or electrolyte leakage. However, the bulging phenomenon of the explosion-proof valve is difficult to detect in real time during vehicle operation, and existing technologies rely on passive mechanical pressure relief, lacking active early warning functions.

[0003] For example, Chinese patent publication number CN217719792U, filed on February 17, 2022, entitled "A Protective Patch Structure for an Explosion-Proof Valve," discloses a protective patch structure for an explosion-proof valve, including an annular patch base layer and a breathable layer on the patch base layer to prevent electrolyte penetration. The patch base layer also has an adhesive layer for bonding and fixing. While this protective patch can prevent electrolyte contamination of the explosion-proof valve and completely isolate the valve from external pollution sources, thus preventing contamination of the valve and affecting battery use, it cannot proactively warn of valve bulging.

[0004] For example, Chinese patent publication number CN217361832U, filed on January 18, 2022, entitled "A Protective Patch for an Explosion-Proof Valve and a Secondary Battery," discloses a protective patch for an explosion-proof valve, disposed on the top cover plate outside the explosion-proof valve. The protective patch includes a protective patch body and a breathable layer. The breathable layer surrounds the explosion-proof valve and is attached to the top cover plate, with the protective patch body covering the breathable layer. Although this protective patch ensures that foreign objects will not enter and damage the explosion-proof valve, and will not affect the burst pressure of the explosion-proof valve, it still belongs to passive mechanical pressure relief. That is, the opening of the explosion-proof valve is entirely driven by internal pressure. When the pressure reaches a preset threshold, the valve body material ruptures due to stress exceeding the limit, achieving pressure relief. It lacks active monitoring, early warning, and intervention capabilities.

[0005] Therefore, there is an urgent need to provide an explosion-proof valve patch with active early warning function. Utility Model Content

[0006] 1. Technical problem to be solved by the utility model

[0007] In existing battery packs, during long-term use, a single abnormal cell may bulge, causing the explosion-proof valve to open and leak. However, the bulging of the explosion-proof valve is difficult to detect in a timely manner, posing a safety risk. This application provides an explosion-proof valve patch with an active early warning function. It emits a buzzer alarm when the explosion-proof valve bulges, identifying the problematic battery cell in advance and reducing safety risks. This application also provides a battery, including the explosion-proof valve patch.

[0008] 2. Technical Solution

[0009] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0010] An explosion-proof valve patch is installed on an explosion-proof valve to cover it, and includes a pressure sensing layer, a circuit layer, and a sound-emitting layer; the pressure sensing layer is located close to the explosion-proof valve, the sound-emitting layer is located away from the explosion-proof valve, the circuit layer is located between the pressure sensing layer and the sound-emitting layer, and the pressure sensing layer, circuit layer, and sound-emitting layer are interconnected.

[0011] Furthermore, a protective layer is connected to the side of the sound-emitting layer opposite to the circuit layer.

[0012] Furthermore, the pressure sensing layer, circuit layer, sound-emitting layer, and protective layer are bonded together with an adhesive layer; the pressure sensing layer is bonded to the explosion-proof valve with an adhesive layer.

[0013] Furthermore, the adhesive layer can be either a full-coverage type or a partial-coverage type.

[0014] Preferably, the adhesive layer between the pressure sensing layer and the explosion-proof valve is a full-coverage or partial-coverage type; the adhesive layer between the pressure sensing layer, the circuit layer, the sound-emitting layer and the protective layer is a full-coverage type.

[0015] Furthermore, the thickness of the explosion-proof valve patch is 1mm to 2mm.

[0016] Furthermore, the thickness of the pressure sensing layer is 50um to 150um, the thickness of the circuit layer is 100um to 250um, the thickness of the sound-emitting layer is 500um to 750um, and the thickness of the protective layer is 10um to 50um.

[0017] Furthermore, the thickness of the adhesive layer is 100µm to 200µm.

[0018] Furthermore, the pressure sensing layer is a piezoelectric material layer; the circuit layer is one of a flexible circuit board, a rigid circuit board, a ceramic substrate, or a metal substrate.

[0019] Furthermore, the sound-generating layer is one of a piezoelectric buzzer, an electromagnetic buzzer, or an electronic buzzer; the protective layer is a flexible transparent material layer.

[0020] The battery, including the aforementioned explosion-proof valve patch.

[0021] 3. Beneficial effects

[0022] Compared with existing known technologies, the technical solution provided by this utility model has the following significant advantages:

[0023] (1) This utility model provides an explosion-proof valve patch, which is installed on an explosion-proof valve to cover it. It includes a pressure sensing layer, a circuit layer, and a sound-emitting layer. The pressure sensing layer is positioned close to the explosion-proof valve, the sound-emitting layer is positioned away from the explosion-proof valve, and the circuit layer is positioned between the pressure sensing layer and the sound-emitting layer. The pressure sensing layer, circuit layer, and sound-emitting layer are interconnected. When the explosion-proof valve expands, the valve first contacts the pressure sensing layer of the patch. The pressure sensing layer detects and contacts the change in mechanical pressure, converting the mechanical pressure into an electrical signal. The circuit layer processes the electrical signal from the pressure sensing layer, and the electrical signal is transmitted to the sound-emitting layer to trigger a buzzer alarm. The explosion-proof valve patch of this application can achieve the following effects: 1. Early risk warning: It issues an alarm in the early stage of cell gas expansion (before reaching the explosion-proof valve opening threshold), detects abnormalities in advance, identifies problematic battery cells, and handles problematic batteries in a timely manner, avoiding thermal runaway or failure of the entire battery pack due to the failure to handle the gas expansion of a single cell in time; 2. Improve safety: It changes from passive explosion protection (relying on the mechanical opening of the explosion-proof valve) to active warning, reducing the probability of accidents such as leakage and fire; 3. Reduce maintenance costs: It quickly identifies the location of gas-filled cells, reduces inspection time and maintenance costs, handles abnormal cells in a timely manner, avoids the replacement of the entire pack, and improves the overall lifespan of the battery pack.

[0024] (2) The present invention provides a battery including an explosion-proof valve patch. The battery of this application avoids and eliminates risks in advance, which brings convenience to remote monitoring of battery safety. It is superior to the passive protection scheme of traditional batteries in terms of safety, reliability and economy. It is especially suitable for new energy vehicles and energy storage scenarios with high energy density and long life. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the explosion-proof valve patch of this utility model;

[0026] Figure 2 This is a cross-sectional view of the explosion-proof valve patch of this utility model;

[0027] Figure 3 This is a bottom view of the explosion-proof valve patch of this utility model;

[0028] Figure 4 This is a cross-sectional view of the explosion-proof valve patch in another embodiment of the present invention;

[0029] Figure 5 This is a bottom view of the explosion-proof valve patch in another embodiment of the present invention;

[0030] Explanation of the labels in the diagram:

[0031] 1. Adhesive layer; 2. Pressure sensing layer; 3. Circuit layer; 4. Sound-emitting layer; 5. Protective layer. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Furthermore, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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 an electrical 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 limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0038] Example

[0039] This embodiment provides an explosion-proof valve patch that is installed on and covers the explosion-proof valve. Figures 1-3 As shown, the device includes a pressure sensing layer 2, a circuit layer 3, a sound-emitting layer 4, and a protective layer 5. The pressure sensing layer 2 is positioned close to the explosion-proof valve, the sound-emitting layer 4 is positioned away from the explosion-proof valve, the circuit layer 3 is positioned between the pressure sensing layer 2 and the sound-emitting layer 4, and the protective layer 5 is connected to the side of the sound-emitting layer 4 opposite to the circuit layer 3. The pressure sensing layer 2, circuit layer 3, sound-emitting layer 4, and protective layer 5 are bonded together by an adhesive layer 1; the pressure sensing layer 2 is also bonded to the explosion-proof valve by the adhesive layer 1. In the explosion-proof valve patch, the side closer to the explosion-proof valve is the inner layer, and the side farther from the explosion-proof valve is the outer layer. The explosion-proof valve patch is arranged from the inside out as follows: adhesive layer 1, pressure sensing layer 2, adhesive layer 1, circuit layer 3, adhesive layer 1, sound-emitting layer 4, adhesive layer 1, and protective layer 5.

[0040] The thickness of pressure sensing layer 2 is 50µm, the thickness of circuit layer 3 is 100µm, the thickness of sound-emitting layer 4 is 500µm, the thickness of protective layer 5 is 10µm, and the thickness of adhesive layer 1 is 100µm. The overall thickness of the explosion-proof valve patch is 1.06mm.

[0041] In this embodiment, adhesive layer 1 is a full-coverage type, such as... Figure 2 and Figure 3As shown, adhesive layer 1 covers the entire contact surface between pressure sensing layer 2, circuit layer 3, sound-emitting layer 4, and protective layer 5. Adhesive layer 1, which bonds pressure sensing layer 2 to the explosion-proof valve, also covers the entire contact surface of pressure sensing layer 2. This full-coverage design provides uniform adhesive strength, ensuring no delamination risk between pressure sensing layer 2, circuit layer 3, sound-emitting layer 4, and protective layer 5, while also ensuring a tight bond between pressure sensing layer 2 and the explosion-proof valve.

[0042] In another embodiment, such as Figure 4 and Figure 5 As shown, the adhesive layer 1 bonded between the pressure sensing layer 2 and the explosion-proof valve is a partial coverage type, meaning that adhesive layer 1 forms a ring-shaped adhesive area along the edge of the pressure sensing layer 2, with no adhesive in the central area. The adhesive layer 1 between the pressure sensing layer 2, circuit layer 3, sound-emitting layer 4, and protective layer 5 is a full coverage type. This combination of full and partial coverage allows for gas flow while maintaining the structural strength of the explosion-proof valve patch, adapting to the dynamic pressure changes of the explosion-proof valve.

[0043] The specific composition of the explosion-proof valve patch of this utility model is as follows:

[0044] The pressure sensing layer 2 is a piezoelectric material layer made of polyvinylidene fluoride (PVDF), which can convert mechanical pressure into electrical signals; the circuit layer 3 is a flexible circuit board (FPC), which processes the signals from the pressure sensing layer 2; the sound-emitting layer 4 is a piezoelectric buzzer, which converts the signals from the circuit layer 3 into sound and emits a buzzer alarm; the protective layer 5 is a flexible transparent material layer made of polyethylene terephthalate (PET), which can protect the internal components.

[0045] In other embodiments, the pressure sensing layer 2 is a piezoelectric material layer made of barium titanate (BaTiO3), lead zirconate titanate (PZT), or PVDF copolymer; the circuit layer 3 is a rigid circuit board, a ceramic substrate, or a metal substrate; the sound-emitting layer 4 is an electromagnetic buzzer or an electronic buzzer; and the protective layer 5 is a flexible transparent material layer made of polycarbonate (PC) or polyethylene naphthalate (PEN).

[0046] When the explosion-proof valve bulges and contacts the explosion-proof valve patch, the pressure sensing layer 2 detects the pressure change and generates an electrical signal. This signal is transmitted to the circuit layer 3, where the microcontroller processes the signal and triggers the sound-emitting layer 4 to emit an alarm sound. This allows for early identification of problematic battery cells, timely detection and handling of faulty batteries, preventing the problem from spreading to the entire battery pack, and reducing the safety risks to the battery pack. This method of early risk avoidance and elimination using the explosion-proof valve patch of this application brings convenience to remote monitoring of battery safety.

[0047] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An explosion-proof valve patch to be mounted on an explosion-proof valve to cover the explosion-proof valve, characterized in that, It includes a pressure sensing layer (2), a circuit layer (3) and a sound-emitting layer (4); the pressure sensing layer (2) is located close to the explosion-proof valve, the sound-emitting layer (4) is located away from the explosion-proof valve, the circuit layer (3) is located between the pressure sensing layer (2) and the sound-emitting layer (4), and the pressure sensing layer (2), the circuit layer (3) and the sound-emitting layer (4) are interconnected.

2. An explosion relief valve patch according to claim 1, wherein, The sound-emitting layer (4) is connected to a protective layer (5) on the side opposite to the circuit layer (3).

3. An explosion relief valve patch according to claim 2, wherein, The pressure sensing layer (2), circuit layer (3), sound-emitting layer (4) and protective layer (5) are bonded together by an adhesive layer (1); the pressure sensing layer (2) is bonded to the explosion-proof valve by the adhesive layer (1).

4. An explosion relief valve patch according to claim 3, wherein, The adhesive layer (1) is either a full-coverage type or a partial-coverage type.

5. The explosion-proof valve patch according to claim 4, characterized in that, The thickness of the explosion-proof valve patch is 1mm to 2mm.

6. The explosion-proof valve patch according to claim 5, characterized in that, The thickness of the pressure sensing layer (2) is 50um to 150um, the thickness of the circuit layer (3) is 100um to 250um, the thickness of the sound-emitting layer (4) is 500um to 750um, and the thickness of the protective layer (5) is 10um to 50um.

7. The explosion-proof valve patch according to claim 6, characterized in that, The thickness of the adhesive layer (1) is 100um to 200um.

8. An explosion-proof valve patch according to any one of claims 2-7, characterized in that, The pressure sensing layer (2) is a piezoelectric material layer; the circuit layer (3) is one of a flexible circuit board, a rigid circuit board, a ceramic substrate, or a metal substrate.

9. The explosion-proof valve patch according to claim 8, characterized in that, The sound-emitting layer (4) is one of a piezoelectric buzzer, an electromagnetic buzzer, or an electronic buzzer; the protective layer (5) is a flexible transparent material layer.

10. A battery, characterized in that, Includes the explosion-proof valve patch as described in any one of claims 1-9.

Images