Battery leakage detection device and battery pack

Abstract

This utility model belongs to the field of battery technology, specifically relating to a battery leakage detection device and battery pack, including an insulating support layer, a conductive inner layer, a wire, and a detection contact layer; the insulating support layer has at least one detection groove, with one side opening extending through one side surface of the insulating support layer; the conductive inner layer is connected to the interior of the insulating support layer; the detection contact layer is connected to the interior of the detection groove and is conductively connected to the conductive inner layer; one end of the wire is conductively connected to the conductive inner layer; the other end of the wire passes through the insulating support layer. This utility model can effectively solve the problem of low-volume leakage being difficult to detect; and can also improve detection effect and efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a battery leakage detection device and a battery pack. Background Technology

[0002] With the continuous development and widespread application of clean energy, battery cells are increasingly being used in various types of equipment and systems, such as energy storage devices and systems. In application, battery cells are typically integrated into battery packs (PACKs). A battery pack may include a housing and multiple battery cells located within it. Each battery cell includes a housing and positive and negative terminals exposed on the housing. During prolonged use, leakage may occur in the battery cells and liquid cooling plates of a battery pack. If this problem is not effectively detected and identified, short circuits and other safety issues will inevitably arise over time. To address this issue, some existing technologies involve installing a standard single-contact water immersion detection device within the energy storage battery pack.

[0003] However, such detectors are often quite thick, taking up too much space and making them difficult to assemble with battery modules; and they often cannot detect leakage problems because the amount of liquid leakage is insufficient to submerge the detector; therefore, their detection is limited and the detection effect is poor. Utility Model Content

[0004] The purpose of this invention is to provide a battery leakage detection device that addresses the shortcomings of existing technologies and solves the problem of poor detection performance in existing technologies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A battery leakage detection device includes an insulating support layer, a conductive inner layer, a wire, and a detection contact layer. The insulating support layer has at least one detection groove, with one side opening extending through one side surface of the insulating support layer. The conductive inner layer is connected to the interior of the insulating support layer. The detection contact layer is connected to the interior of the detection groove and is conductively connected to the conductive inner layer. One end of the wire is conductively connected to the conductive inner layer, and the other end of the wire passes through the insulating support layer.

[0007] Preferably, the insulating support layer covers and is connected to the outer surface of the conductive inner layer.

[0008] Preferably, the thickness h2 of the conductive inner layer satisfies: 0.05mm≤h2≤0.15mm.

[0009] Preferably, the number of detection grooves is at least two, and they are disposed on two opposite side surfaces of the insulating support layer; and each detection groove is provided with a detection contact layer inside.

[0010] Preferably, the thickness of the detection groove H and the thickness h1 of the detection contact layer are related in such a way that: H-h2=A; 0.2mm≤A≤0.5mm.

[0011] Preferably, the insulating support layer is further provided with a notch, and an insulating fixing layer is provided in the notch; the insulating support layer, the wire and the conductive inner layer are all connected to the insulating fixing layer.

[0012] Preferably, the conductor includes a first polarity connecting line and a second polarity connecting line with opposite polarities; the conductive inner layer includes a first metal conductive block and a second metal conductive block; both the first metal conductive block and the second metal conductive block are connected inside the insulating support layer, and the first metal conductive block and the second metal conductive block are separated; one end of the first polarity connecting line is electrically connected to the first metal conductive block; one end of the second polarity connecting line is electrically connected to the second metal conductive block; and the detection contact layer includes at least one first metal contact point and at least one second metal contact point; one side of the first metal contact point is electrically connected to the first metal conductive block; one side of the second metal contact point is electrically connected to the second metal conductive block.

[0013] Preferably, the insulating support layer is made of polyimide, polyterephthalic acid (PTA) plastic, or polyethylene.

[0014] And / or, the material of the conductive inner layer is a copper sheet or a silver sheet;

[0015] And / or, the material of the detection contact layer is solder or lead-tin alloy.

[0016] This utility model also discloses a battery pack, including a battery body and the aforementioned battery leakage detection device; and the battery body is connected to the upper surface of the insulating support layer and is disposed at the opening of the detection groove.

[0017] Preferably, the battery pack further includes a liquid cooling plate; the liquid cooling plate is connected to the lower surface of the insulating support layer and is disposed at the opening of the detection groove at the bottom.

[0018] The beneficial effects of this utility model are that, by using at least two detection grooves to guide the collected leakage liquid to the detection contact layer, the detection contact layer and the conductive inner layer are made to make contact with each other and achieve conductivity; then, the electrical signal is guided to the circuit of the external detection device through the wire; thereby realizing the collection and detection operation of leakage liquid at multiple positions and directions; thus, it helps to solve the problem that low-volume leakage liquid is difficult to detect; and expands its detection coverage, and can also improve detection effect and efficiency. Attached Figure Description

[0019] The following will refer to the appendix. Figures 1-6 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0020] Figure 1 This is a cross-sectional view of a battery leakage detection device according to an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of a battery leakage detection device according to another embodiment of the present invention;

[0022] Figure 3 This is a top view of a battery leakage detection device according to an embodiment of the present invention;

[0023] Figure 4 This is a top view of a battery leakage detection device according to another embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present invention.

[0026] In the figure: 1-Insulating support layer; 11-Detection groove; 2-Conductive inner layer; 21-First metal conductive block; 22-Second metal conductive block; 3-Wire; 31-First polarity connection line; 32-Second polarity connection line; 4-Detection contact layer; 41-First metal contact point; 42-Second metal contact point; 5-Insulating fixing layer; 6-Battery body; 7-Liquid cooling plate. Detailed Implementation

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is intended to particularly describe embodiments and not to limit the scope of this application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the embodiment description, "multiple" refers to two or more, unless otherwise specifically defined.

[0029] The term 'embodiment' means that a particular feature, structure, or characteristic described exists in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.

[0031] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can also refer to a mechanical connection or an electrical connection. They can be directly connected or indirectly connected through an intermediate medium, manifesting as internal communication between two components or an interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0032] The following is in conjunction with the appendix Figures 1-6 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0033] like Figure 1As shown in one embodiment of this utility model, the battery leakage detection device includes an insulating support layer 1, a conductive inner layer 2, a wire 3, and a detection contact layer 4. The insulating support layer 1 has at least one detection groove 11, with one side opening extending through one side surface of the insulating support layer 1. The conductive inner layer 2 is connected to the interior of the insulating support layer 1. The detection contact layer 4 is connected to the interior of the detection groove 11 and is electrically connected to the conductive inner layer 2. One end of the wire 3 is electrically connected to the conductive inner layer 2. The other end of the wire 3 passes through the insulating support layer 1 and is used for electrical connection to the circuit of an external detection device. The battery leakage detection device functions as a leakage contact collection head. The circuit of the corresponding external detection device can be adapted according to the actual application process and conventional methods in the field, and is not limited here.

[0034] The technical solution of this utility model uses at least one detection groove to guide the collected leakage liquid to the detection contact layer, so as to promote the contact assembly of the detection contact layer and the conductive inner layer to achieve conductivity; then, the electrical signal is guided to the circuit of the external detection device through the wire; thereby realizing the collection and detection operation of leakage liquid at a specific location or multiple locations and directions; thus, it helps to solve the problem that low-volume leakage liquid is difficult to detect; and expands its detection coverage, and can also improve detection effect and efficiency.

[0035] Specifically, in some implementations, such as Figure 1 and 2 As shown, the insulating support layer 1 covers and is connected to the outer surface of the conductive inner layer 2; it serves to conduct electricity and provide insulation, and also provides support for the overall structure.

[0036] Specifically, in some implementations, such as Figure 2 As shown, the thickness h2 of the conductive inner layer 2 satisfies: 0.05mm ≤ h2 ≤ 0.15mm; h2 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.13mm, 0.15mm, etc.; preferably 0.10mm. This structure can ensure the orderly conduction of electrical conductivity; it can also effectively reduce the space occupied by the thickness.

[0037] Specifically, in some implementations, such as Figure 1 and 2 As shown, there are at least two detection grooves 11, which are disposed on two opposite side surfaces of the insulating support layer 1; and each detection groove 11 is provided with the detection contact layer 4 inside; so as to realize the function of collecting and sensing the leakage in the upper and lower directions of the insulating support layer 1; thereby improving the detection coverage and improving the detection effect and efficiency.

[0038] Specifically, in some implementations, such as Figure 2 As shown, the relationship between the thickness H of the detection groove 11 and the thickness h1 of the detection contact layer 4 satisfies: H - h2 = A; 0.2mm ≤ A ≤ 0.5mm; A can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.41mm, 0.45mm, 0.5mm, etc.; preferably 0.4mm. This is to prevent direct contact between the detection contact layer 4 and conductive parts, which could cause false leakage detection alarms; and it also ensures the stability and sensitivity of leakage collection and detection.

[0039] Specifically, in some implementations, such as Figure 1 and 2 As shown, the insulating support layer 1 also has a notch, within which an insulating fixing layer 5 is disposed; the insulating support layer 1, the wire 3, and the conductive inner layer 2 are all connected to the insulating fixing layer 5. In some embodiments, the insulating fixing layer 5 is an insulating hot melt adhesive; more specifically, it is an insulating rubber hot melt adhesive. This structure ensures the assembly stability between the insulating support layer 1, the wire 3, and the conductive inner layer 2, and also improves the ease of disassembly and maintenance of the wire 3; furthermore, it provides insulation protection for the soldered pin area of ​​the wire 3.

[0040] Specifically, in some implementations, such as Figure 1 and 3 As shown in Figure 4, the conductor 3 includes a first polarity connecting line 31 and a second polarity connecting line 32 with opposite polarities; the conductive inner layer 2 includes a first metal conductive block 21 and a second metal conductive block 22; both the first metal conductive block 21 and the second metal conductive block 22 are connected inside the insulating support layer 1, and the first metal conductive block 21 and the second metal conductive block 22 are separated; one end of the first polarity connecting line 31 is electrically connected to the first metal conductive block 21; one end of the second polarity connecting line 32 is electrically connected to the second metal conductive block 22; the detection contact layer 4 includes at least one first metal contact point 41 and at least one second metal contact point 42; one side of the first metal contact point 41 is electrically connected to the first metal conductive block 21; one side of the second metal contact point 42 is electrically connected to the second metal conductive block 22. Wherein, when the second polarity connecting line 32 is a negative polarity connecting line, the first polarity connecting line 31 is a positive polarity connecting line. When the second polarity connection line 32 is the positive polarity connection line, the first polarity connection line 31 is the negative polarity connection line. Further, in some embodiments, such as... Figure 5 As shown, the first metal conductive block 21 is selected as a first metal conductive block with a straight cross-section; the second metal conductive block 22 is selected as a second metal conductive block with a straight cross-section. In other embodiments, such as Figure 5As shown, the first metal conductive block 21 is selected with a U-shaped or C-shaped cross-section; the second metal conductive block 22 is selected with a U-shaped or C-shaped cross-section. These two forms can increase the coverage area of ​​the collection and detection, which is beneficial to improving the detection effect and efficiency.

[0041] Specifically, in some embodiments, the insulating support layer 1 is made of materials such as PI (polyimide), PET (polyethylene terephthalate), and PE (polyethylene) to provide conductivity and insulation, as well as structural support, thereby giving the entire leakage detection device a certain structural strength and flexibility.

[0042] Specifically, in some embodiments, the conductive inner layer 2 is made of copper or silver sheets, and the detection contact layer 4 is made of solder or lead-tin alloy (the commonly used lead-tin alloy ratio is 63 / 37, that is, 63% tin and 37% lead) to ensure its conduction speed and efficiency.

[0043] This utility model also proposes a battery pack, such as Figure 5 As shown, the battery pack includes a battery pack housing, a battery body 5, and a battery leakage detection device. Both the battery body 5 and the battery leakage detection device are disposed inside the battery pack housing. There are at least two battery bodies 5, arranged side-by-side. The battery body 5 is connected to the upper surface of the insulating support layer 1 and is positioned at the opening of the detection groove 11. The specific structure of the battery leakage detection device is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0044] The battery body 5 includes a battery casing and a battery cell disposed inside the battery casing. The battery cell includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector. The positive current collector can be made of aluminum, and the positive active material layer includes positive active material, such as lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector can be made of copper, and the negative active material layer includes negative active material, such as carbon or silicon. The separator can be made of PP (polypropylene) or PE (polyethylene), etc.

[0045] When the battery body 5 in the battery pack leaks, the leaked liquid will flow into the detection groove 11 of the detection device under the action of gravity between the first metal contact point 41 (solder point) and the second metal contact point 42 (solder point) of opposite polarity, forming a conductive effect on the circuit of the detection device. At this time, the leakage detection device will output an electrical signal to inform the BMS battery management system.

[0046] Specifically, in some implementations, such as Figure 6 As shown, the battery pack also includes a liquid cooling plate 7; the liquid cooling plate 7 is connected to the lower surface of the insulating support layer 1 and is disposed at the opening of the detection groove 11 at the bottom. The liquid cooling plate 7 has a storage cavity for storing coolant; and the liquid cooling plate 7 also has an input pipe and an output pipe; the input pipe and / or the output pipe are used to communicate with a liquid pump; and the liquid pump is connected to a storage tank.

[0047] When the liquid cooling plate 7 leaks, the leaked liquid will overflow and evaporate into the detection groove 11 of the detection device between the first metal contact point 41 (solder point) and the second metal contact point 42 (solder point) of opposite polarity, forming a conductive effect on the circuit of the detection device. At this time, the leakage detection device will output an electrical signal to inform the BMS battery management system.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0049] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A battery leakage detection device, characterized in that: The device includes an insulating support layer, a conductive inner layer, a wire, and a detection contact layer. The insulating support layer has at least one detection groove, with one side opening extending through one side surface of the insulating support layer. The conductive inner layer is connected to the interior of the insulating support layer. The detection contact layer is connected to the interior of the detection groove and is conductively connected to the conductive inner layer. One end of the wire is conductively connected to the conductive inner layer, and the other end of the wire passes through the insulating support layer.

2. The battery leakage detection device according to claim 1, characterized in that: The insulating support layer is wrapped around and connected to the outer surface of the conductive inner layer.

3. The battery leakage detection device according to claim 1 or 2, characterized in that: The thickness h2 of the conductive inner layer satisfies: 0.05mm≤h2≤0.15mm.

4. The battery leakage detection device according to claim 1 or 2, characterized in that: The number of detection grooves is at least two, and they are disposed on two opposite side surfaces of the insulating support layer; and each detection groove is provided with a detection contact layer inside.

5. The battery leakage detection device according to claim 1, characterized in that: The relationship between the thickness H of the detection groove and the thickness h1 of the detection contact layer satisfies: H - h2 = A; 0.2mm≤A≤0.5mm.

6. The battery leakage detection device according to claim 1, characterized in that: The insulating support layer is also provided with a notch, and an insulating fixing layer is provided in the notch; the insulating support layer, the wire and the conductive inner layer are all connected to the insulating fixing layer.

7. The battery leakage detection device according to claim 1, characterized in that: The conductor includes a first polarity connecting line and a second polarity connecting line with opposite polarities; the conductive inner layer includes a first metal conductive block and a second metal conductive block; both the first metal conductive block and the second metal conductive block are connected inside the insulating support layer, and the first metal conductive block and the second metal conductive block are separated; one end of the first polarity connecting line is electrically connected to the first metal conductive block; one end of the second polarity connecting line is electrically connected to the second metal conductive block; and the detection contact layer includes at least one first metal contact point and at least one second metal contact point; one side of the first metal contact point is electrically connected to the first metal conductive block; one side of the second metal contact point is electrically connected to the second metal conductive block.

8. The battery leakage detection device according to claim 1, characterized in that: The insulating support layer is made of polyimide, polyterephthalic acid plastic, or polyethylene. And / or, the material of the conductive inner layer is a copper sheet or a silver sheet; And / or, the material of the detection contact layer is solder or lead-tin alloy.

9. A battery pack, characterized in that: It includes a battery body and a battery leakage detection device as described in any one of claims 1 to 8; and the battery body is connected to the upper surface of the insulating support layer and disposed at the opening of the detection groove.

10. The battery pack according to claim 9, characterized in that: The battery pack also includes a liquid cooling plate; the liquid cooling plate is connected to the lower surface of the insulating support layer and is disposed at the opening of the detection groove at the bottom.

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