Early warning device, battery device and electric equipment

Abstract

The invention provides an early warning device, a battery device and electric equipment, and relates to the technical field of batteries. The early warning device comprises a first insulating part, a second insulating part and a conductive part. The first insulating part is provided with an opening; the second insulating part and the first insulating part are oppositely arranged; the conductive part is positioned between the first insulating part and the second insulating part; the detection section of the conductive piece faces the opening; the connecting section of the conductive part is electrically connected with a battery management system of the battery device; when the early warning device and the battery device are cooperatively connected, the anti-explosion valve is opposite to the detection section through the opening. And through the arrangement of the early warning device, the safety of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an early warning device, a battery device, and an electrical device. Background Art

[0002] With the continuous development of battery device technology, the energy density and capacity of battery devices have also been improved, allowing battery devices to be used in different fields.

[0003] In the related art, a battery device includes a battery cell. An explosion-proof valve is provided on a housing of the battery cell so that the battery cell can be detached from the housing through the explosion-proof valve, thereby delaying thermal runaway of the battery cell in the battery device.

[0004] However, when the battery device is in use, it is difficult to detect that the explosion-proof valve is detached from the housing, which leads to a potential safety hazard in the battery device and reduces the safety of the battery device. Summary of the Invention

[0005] The present application provides an early warning device, a battery device, and an electrical device, which can improve the safety of the battery device.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] The present application provides an early warning device, which is applied to a battery device having an explosion-proof valve; the early warning device comprises:

[0008] a first insulating member, wherein the first insulating member has an opening;

[0009] a second insulating member, the second insulating member being arranged opposite to the first insulating member;

[0010] a conductive member, the conductive member being located between the first insulating member and the second insulating member; the detection section of the conductive member facing the opening; and the connecting section of the conductive member being used to electrically connect to a battery management system of the battery device;

[0011] When the early warning device and the battery device are connected in cooperation, the explosion-proof valve is opposite to the detection section through the opening.

[0012] In some embodiments, the detection section and the first insulating member are spaced apart along a first direction along the thickness direction of the first insulating layer, so that when the early warning device and the battery device are connected, the explosion-proof valve and the detection section are opposite and spaced apart;

[0013] The first direction is along an opposing direction of the first insulating member and the second insulating member.

[0014] In some embodiments, the second insulating member has a receiving portion, the receiving portion and the opening are correspondingly arranged, and the detection section is located in the receiving portion and faces the opening.

[0015] In some embodiments, the conductive member has a first conductive extension segment, the first conductive extension segment forms the detection segment, and the first conductive extension segment is located in the accommodating portion;

[0016] When the early warning device and the battery device are connected in cooperation, the end face of the explosion-proof valve is covered, and the orthographic projection of the first conductive extension section on the surface where the end face of the explosion-proof valve is located is covered by the end face of the explosion-proof valve.

[0017] In some embodiments, the conductive member further includes a second conductive extension segment, and the second conductive extension segment and the first conductive extension segment are arranged along the first direction;

[0018] In a plane perpendicular to the first direction, an extension direction of the second conductive extension segment intersects with an extension direction of the first conductive extension segment;

[0019] The first direction is along an opposing direction of the first insulating member and the second insulating member.

[0020] In some embodiments, along the first direction, the second conductive extension segment and the first conductive extension segment are spaced apart.

[0021] In some embodiments, the conductive member further includes a third conductive extension segment, two ends of the third conductive extension segment are respectively connected to the first conductive extension segment and the second conductive extension segment;

[0022] The third conductive extension segment extends along the first direction, so that the second conductive extension segment and the first conductive extension segment are spaced apart along the first direction.

[0023] In some embodiments, there are multiple openings, each of which corresponds one-to-one to the multiple explosion-proof valves on the battery device.

[0024] There are multiple accommodating portions, and the accommodating portions correspond to the openings one by one;

[0025] There are a plurality of first conductive extension segments, and the first conductive extension segments correspond to the openings one by one;

[0026] There are a plurality of second conductive extension segments, and the second conductive extension segments and the first conductive extension segments are arranged alternately;

[0027] There are multiple third conductive extension segments, and each of the third conductive extension segments connects adjacent first conductive extension segments and second conductive extension segments.

[0028] In some embodiments, at least one of the second conductive extension segments forms the connecting segment, and in a plane perpendicular to the first direction, the connecting segment is located on at least one side of the first insulating member.

[0029] In some embodiments, at least one of the third conductive extension segments forms the connecting segment, and in a plane perpendicular to the first direction, the connecting segment is located on at least one side of the first insulating member.

[0030] In some embodiments, the early warning device further includes an adapter, which is connected to the connecting section of the conductive member and is used to electrically connect the conductive member and the battery management system.

[0031] In some embodiments, the conductive member includes a bent structure.

[0032] In some embodiments, the orthographic projection of the bent structure on the plane where the first insulating member is located is serpentine.

[0033] In some embodiments, the conductive member is formed by etching or die cutting.

[0034] In some embodiments, the cross-sectional profile of the conductive member is circular, the diameter of the conductive member is D, and D satisfies: 0.05 mm ≤ D ≤ 1 mm;

[0035] And / or, the tensile strength of the conductive member is S, and S satisfies: 10 MPa≤S≤50 MPa;

[0036] And / or, the melting point of the conductive member is T, and T satisfies: 130°C≤T≤300°C.

[0037] In some embodiments, the second insulating member has a protrusion, and the protrusion forms the receiving portion.

[0038] In a second aspect, the present application provides a battery device, comprising:

[0039] A battery assembly having an explosion-proof valve;

[0040] The early warning device described in the first aspect is provided on at least one side of the battery assembly, the explosion-proof valve passes through an opening of the early warning device and is opposite to the detection section of the conductive member of the early warning device;

[0041] A battery management system is electrically connected to the battery assembly and the early warning device, and is used to obtain the voltage value of the conductive member and issue an early warning signal according to the obtained voltage value.

[0042] In some embodiments, the battery includes a plurality of battery cells, each of which includes a shell, a positive electrode column, and a negative electrode column. The positive electrode column and the negative electrode column are both disposed on the shell, and the positive electrode column and the shell are electrically connected.

[0043] The housing is electrically connected to the battery management system.

[0044] In some embodiments, the battery device further comprises a bracket, wherein the bracket is disposed on a side of the warning device facing away from the battery assembly;

[0045] The battery management system is connected to a side of the bracket facing away from the early warning device.

[0046] In some embodiments, the battery management system includes a first control module, a first resistor, a second resistor, a preset power supply, and a first voltage detection module, wherein the first control module, the first resistor, the conductive member, and the second resistor are connected in series and electrically conductive to the preset power supply; the first voltage detection module and the conductive member are connected in parallel;

[0047] And / or, the battery management system includes a second control module and a second voltage detection module; the second voltage detection module is electrically connected to the negative electrode of the battery assembly and the conductive member respectively.

[0048] In some embodiments, the first conductive extension section of the conductive member extends along the length direction of the explosion-proof valve.

[0049] In some embodiments, the battery assembly has a plurality of explosion-proof valves, and the explosion-proof valves correspond to the openings of the early warning device one by one.

[0050] In a third aspect, the present application provides an electrical device, comprising: the battery device provided in the second aspect.

[0051] The present application provides an early warning device, a battery device, and an electrical appliance. The early warning device includes a first insulating member, a second insulating member, and a conductive member. The first insulating member has an opening; the second insulating member is disposed opposite the first insulating member; the conductive member is located between the first and second insulating members; a detection section of the conductive member faces the opening; the connection section of the conductive member is used to electrically connect to the battery management system of the battery device; and when the early warning device and the battery device are connected, the explosion-proof valve faces the detection section through the opening. In this application, the conductive member is electrically connected to the battery management system to monitor the electrical parameters of the conductive member. When the explosion-proof valve contacts the detection section of the conductive member, the battery management system can detect changes in the electrical parameters of the conductive member and generate corresponding early warning signals to inform the user of the battery device's usage status. In addition, the opening allows electrolyte leaking from the explosion-proof valve to electrically connect to the detection section of the conductive member, causing changes in the electrical parameters of the conductive member. Based on these changes in the electrical parameters of the conductive member, the battery management system can generate early warning signals to inform the user of the battery device's usage status. In this way, the early warning device monitors and provides early warnings for the battery device, thereby improving the safety of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0053] Figure 1 A schematic diagram of a battery device provided in an embodiment of the present application;

[0054] Figure 2 An exploded diagram of the structure of a battery device provided in an embodiment of the present application;

[0055] Figure 3 for Figure 2 A partial enlarged view of the dotted box portion;

[0056] Figure 4 An exploded diagram of the structure of the early warning device provided in an embodiment of the present application;

[0057] Figure 5 for Figure 4 A partial enlarged view of the circular dotted frame portion;

[0058] Figure 6 A schematic diagram of a battery device provided in an embodiment of the present application from another perspective;

[0059] Figure 7 for Figure 6 A partial enlarged view of the dotted box portion;

[0060] Figure 8 A circuit schematic diagram of the battery management system of the early warning device and battery device provided in the embodiments of the present application;

[0061] Figure 9 A schematic diagram of an electrical device provided in an embodiment of the present application.

[0062] Description of reference numerals:

[0063] 100-early warning device;

[0064] 110 - first insulating member; 111 - opening;

[0065] 120 - second insulating member; 121 - receiving portion; 122 - protrusion;

[0066] 130 - conductive member; 131 - detection section; 132 - connection section; 133 - first conductive extension section; 134 - second conductive extension section; 135 - third conductive extension section;

[0067] 140-Adapter;

[0068] 200-battery device;

[0069] 210-battery assembly; 211-explosion-proof valve; 212-battery cell; 2121-housing; 2122-positive electrode column; 2123-negative electrode column;

[0070] 220 - battery management system; 221 - first control module; 222 - first resistor; 223 - second resistor; 224 - preset power supply; 225 - first voltage detection module; 226 - second control module; 227 - second voltage detection module;

[0071] 230-bracket;

[0072] 300-Electrical equipment. DETAILED DESCRIPTION

[0073] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0074] During use, the temperature inside the battery device rises, and the pressure inside the battery cells increases, which can easily cause the battery device to bulge. Furthermore, the battery device may experience abnormal thermal runaway, where the pressure and temperature inside the battery device rise sharply, or even explode. Therefore, in some embodiments, the battery device has an explosion-proof valve to release the pressure inside the battery device through the explosion-proof valve and reduce the temperature inside the battery device, thereby delaying the explosion of the battery device caused by thermal runaway, thereby improving the safety of the battery device.

[0075] However, with long-term use of the battery device, the explosion-proof valve of the battery device may age, become accidentally detached, or leak. Such changes are not easily detected by the user and pose a hidden danger to the use of the battery device, resulting in a decrease in the safety of the battery device.

[0076] To address the above issues, an embodiment of the present application provides an early warning device 100, which is applied to a battery device 200. The early warning device 100 can monitor the battery device 200's usage status and issue early warning prompts based on abnormal operating conditions of the battery device 200, thereby improving the safety of the battery device 200.

[0077] See Figure 1 、 Figure 2 、 Figure 4 and Figure 5 Exemplarily, the early warning device 100 includes a first insulating member 110, a second insulating member 120, and a conductive member 130. The first insulating member 110 has an opening 111; the second insulating member 120 and the first insulating member 110 are disposed opposite each other; the conductive member 130 is located between the first insulating member 110 and the second insulating member 120; a detection section 131 of the conductive member 130 faces the opening 111; and a connection section 132 of the conductive member 130 is configured to electrically connect to the battery management system 220 (BMS) of the battery device 200. When the early warning device 100 and the battery device 200 are connected, the explosion-proof valve 211 faces the detection section 131 through the opening 111.

[0078] Combine Figure 2 、 Figure 3 、 Figure 4 and Figure 5In some embodiments, the first insulating member 110 is provided with an opening 111, and the detection section 131 is provided corresponding to the opening 111. The shape of the opening 111 matches the explosion-proof valve 211 of the battery device 200. Of course, the shape of the opening 111 can be any shape, as long as the explosion-proof valve 211 can be aligned with the detection element of the conductive member 130 through the opening 111 when the early warning device 100 and the battery device 200 are connected. This embodiment of the present application does not impose specific requirements on the shape of the opening 111 on the first insulating member 110.

[0079] In the embodiment of the present application, a conductive member 130 is disposed between the first insulating member 110 and the second insulating member 120. The first insulating member 110 and the second insulating member 120 provide protection for the conductive member 130 and prevent accidental electrical connection between the conductive member 130 and the battery device 200, thereby ensuring the accuracy of the electrical parameters of the conductive member 130 obtained by the BMS. The conductive member 130 is electrically connected to the BMS and monitors the electrical parameters of the conductive member 130. When the explosion-proof valve 211 contacts the detection section 131 of the conductive member 130, the BMS can detect changes in the electrical parameters of the conductive member 130 and generate corresponding warning signals to inform the user of the usage status of the battery device 200. Furthermore, the provision of the opening 111 allows electrolyte leaking from the explosion-proof valve 211 to electrically connect to the detection section 131 of the conductive member 130, causing changes in the electrical parameters of the conductive member 130. Based on these changes in the electrical parameters of the conductive member 130, the BMS can generate warning signals to inform the user of the usage status of the battery device 200. In this way, the early warning device 100 monitors and warns the battery device 200 , thereby improving the safety of the battery device 200 .

[0080] It should be noted that the materials of the first insulating member 110 and the second insulating member 120 can be the same material or different materials, and there is no specific requirement for this.

[0081] Exemplarily, the first insulating member 110 may be a polyimide film (PI), a polyethylene terephthalate film (PET), or the like, and the second insulating member 120 may also be a polyimide film (PI), a polyethylene terephthalate film (PET), or the like.

[0082] It is easy to understand that when the warning device 100 and the battery device 200 are connected, the explosion-proof valve 211 passes through the opening 111 in the first insulating member 110 and faces the detection section 131. During use, since the conductive member 130 is electrically connected to the BMS, the BMS can obtain the electrical parameters of the conductive member 130. The BMS can then issue a warning signal based on changes in the electrical parameters of the conductive member 130. However, if the explosion-proof valve 211 and the conductive member 130 accidentally come into contact, this will cause the electrical parameters of the conductive member 130 to change significantly, causing the BMS to issue an erroneous warning signal. Furthermore, since the housing 2121 of the battery device 200 is electrically charged and the warning device 100 is installed on the battery device 200, there is also the possibility that the detection section 131 of the conductive member 130 and the housing 2121 of the battery device 200 may accidentally become electrically conductive, causing the BMS to issue an erroneous warning signal.

[0083] To address the above-mentioned issues, in the embodiment of the present application, the detection section 131 and the first insulating member 110 are spaced apart along the first direction, so that when the early warning device 100 and the battery device 200 are connected, the explosion-proof valve 211 and the detection section 131 are opposite and spaced apart. Thus, by spacing the detection section 131 and the first insulating member 110, a gap is created between the detection section 131 and the explosion-proof valve 211, creating a mounting margin between the early warning device 100 and the battery device 200 to prevent contact between the explosion-proof valve 211 and the detection section 131, thereby ensuring the reliability of the early warning device 100 and the safety of the battery device 200.

[0084] It should be noted that the first direction in the embodiment of the present application is along the relative direction of the first insulating member 110 and the second insulating member 120 .

[0085] It is easy to understand that after the battery device 200 experiences thermal runaway, the explosion-proof valve 211 opens, and the electrolyte within the battery device 200 flows to the outside of the battery device 200. Alternatively, if the electrolyte accidentally leaks, the electrolyte will pass through the opening 111 in the first insulating member 110 and become electrically conductive with the detection segment 131. In this way, the BMS can detect changes in the electrical parameters of the conductive member 130, thereby quickly and accurately generating a warning signal and enhancing the safety of the battery device 200. However, if the electrolyte leaks, the uncontrolled flow of the electrolyte may cause a short circuit within the battery device 200, resulting in a decrease in the safety of the battery device 200.

[0086] Therefore, in an optional embodiment of the present application, the second insulating member 120 has a receiving portion 121 , the receiving portion 121 and the opening 111 are correspondingly arranged, and the detection section 131 is located in the receiving portion 121 and faces the opening 111 .

[0087] In the embodiment of the present application, the accommodating portion 121 is provided correspondingly to the opening 111. It is understood that the position of the accommodating portion 121 corresponds to the position of the opening 111, and the accommodating portion 121 and the opening 111 are opposite each other. The orthographic projection of the accommodating portion 121 on the plane where the first insulating member 110 is located overlaps the orthographic projection of the opening 111 on the plane where the first insulating member 110 is located. It is also understood that the projected area of ​​the accommodating portion 121 can be greater than the projected area of ​​the opening 111, or the projected area of ​​the accommodating portion 121 can be equal to the projected area of ​​the opening 111.

[0088] The detection section 131 is located in the accommodating portion 121 and faces the opening 111. In this way, when the early warning device 100 and the battery device 200 are coordinated, the explosion-proof valve 211 and the detection section 131 are opposite to each other, and the electrolyte leaked from the explosion-proof valve 211 can also enter the accommodating portion 121 through the opening 111. In this way, the accommodating portion 121 is provided to accommodate the leaked electrolyte, thereby hindering the free flow of the electrolyte after leakage, thereby reducing the probability of the battery device 200 short-circuiting and causing a fire due to electrolyte leakage, reducing the safety hazards of the battery device 200, and improving the safety of the battery device 200.

[0089] It should be noted that the accommodating portion 121 in the embodiment of the present application has a cavity, which may be annular, spherical, etc. The embodiment of the present application does not make specific requirements for this.

[0090] Optionally, the second insulating member 120 has a protrusion 122 , and the protrusion 122 forms the receiving portion 121 .

[0091] See Figure 3 Along the first direction, protrusion 122 protrudes from the surface of second insulating member 120 toward the side facing away from first insulating member 110. Protrusion 122 forms a receiving portion 121 on the surface facing first insulating member 110. After first insulating member 110 and second insulating member 120 are connected, receiving portion 121 can accommodate leaked electrolyte, preventing the electrolyte from flowing after leakage, preventing the electrolyte from causing an internal short circuit in battery device 200, and preventing damage to other connecting components of battery device 200, thereby improving the safety of battery device 200.

[0092] Combine Figure 3 、 Figure 4 and Figure 5 As an optional embodiment, conductive member 130 includes a first conductive extension segment 133, which forms detection segment 131 and is located within accommodating portion 121. When early warning device 100 and battery device 200 are connected, the orthographic projection of first conductive extension segment 133 on the surface where the end face of explosion-proof valve 211 is located is covered by the end face of explosion-proof valve 211.

[0093] In the embodiment of the present application, the orthographic projection area of ​​the first conductive extension 133 on the surface of the end face of the explosion-proof valve 211 is smaller than the area of ​​the end face of the explosion-proof valve 211, and the first conductive extension 133 can still meet the requirements of the change in the electrical parameters of the first conductive extension 133 caused by the explosion-proof valve 211. As such, the use of such a first conductive extension 133 can reduce the material usage of the conductive member 130, further reducing the production cost and weight of the early warning device 100. When the early warning device 100 is used in a battery device 200, the production cost and weight of the battery device 200 can also be reduced.

[0094] In some embodiments, the orthographic projection area of ​​the first conductive extension 133 on the surface of the end face of the explosion-proof valve 211 is equal to the area of ​​the end face of the explosion-proof valve 211. Thus, after the explosion-proof valve 211 is separated from the battery device 200, the first conductive extension 133 can ensure reliable contact and connection between the explosion-proof valve 211 and the first conductive extension 133, making the changes in the electrical parameters of the conductive member 130 more accurate. This can enhance the accuracy and reliability of the BMS warning signal and the safety of the battery device 200.

[0095] It should be noted that in the embodiment of the present application, the orthographic projection area of ​​the first conductive extension segment 133 on the end surface of the explosion-proof valve 211 can be adjusted by controlling the length and / or width of the first conductive extension segment 133. Furthermore, the embodiment of the present application does not impose specific requirements on the length and / or width of the first conductive extension segment 133.

[0096] In some embodiments, the extension direction of the first conductive extension segment 133 intersects the first direction. It is easy to understand that the extension direction of the first conductive extension segment 133 can be any direction within a plane perpendicular to the first direction.

[0097] In some embodiments, the conductive member 130 further includes a second conductive extension segment 134, and the second conductive extension segment 134 and the first conductive extension segment 133 are arranged along a first direction; in a plane perpendicular to the first direction, the extension direction of the second conductive extension segment 134 and the extension direction of the first conductive extension segment 133 intersect; the first direction is along the relative direction of the first insulating member 110 and the second insulating member 120.

[0098] Exemplarily, the extension direction of the second conductive extension segment 134 intersects with the extension direction of the first conductive extension segment 133, that is, an angle is formed between the two, and the angle value of the angle can be: 30°, 45°, 60°, 90°, 105°, etc. It can be understood that the angle can be an acute angle, a right angle or an obtuse angle, and the embodiments of the present application do not limit this.

[0099] Furthermore, the second conductive extension segment 134 and the first conductive extension segment 133 are arranged along the first direction, wherein the second conductive extension segment 134 and the first conductive extension segment 133 can be located in the same plane perpendicular to the first direction, or in different planes, which is not required in the embodiment of the present application.

[0100] In some embodiments, along the first direction, the second conductive extension segment 134 and the first conductive extension segment 133 are spaced apart to ensure that along the first direction, the first conductive extension segment 133 can be opposite to and spaced from the end face of the explosion-proof valve 211, thereby avoiding accidental contact between the first conductive extension segment 133 and the explosion-proof valve 211, making the detection of the early warning device 100 accurate and the reliability enhanced, so that when the early warning device 100 is applied to the battery device 200, the safety of the battery device 200 can be improved.

[0101] See Figure 5 Conductive member 130 further includes a third conductive extension segment 135, the ends of which connect first conductive extension segment 133 and second conductive extension segment 134, respectively. Third conductive extension segment 135 extends along the first direction, thereby separating second conductive extension segment 134 from first conductive extension segment 133 along the first direction. In this embodiment, third conductive extension segment 135 connects first conductive extension segment 133 and second conductive extension segment 134, thereby preventing stress concentration at the junction of first conductive extension segment 133 and second conductive extension segment 134.

[0102] In some embodiments, the battery device 200 often has multiple explosion-proof valves 211. The structure of the early warning device 100 needs to be compatible with the structure of the battery device 200. It is not difficult to understand that there can be multiple openings 111 on the first insulating member 110, and the openings 111 and the explosion-proof valves 211 are set one by one. Correspondingly, there are multiple accommodating portions 121, and the accommodating portions 121 and the openings 111 correspond one by one. There are multiple first conductive extension segments 133, and the first conductive extension segments 133 and the openings 111 correspond one by one. There are multiple second conductive extension segments 134, and the second conductive extension segments 134 and the first conductive extension segments 133 are arranged alternately; there are multiple third conductive extension segments 135, and the third conductive extension segments 135 connect the adjacent first conductive extension segments 133 and the second conductive extension segments 134.

[0103] In this way, each accommodating portion 121 corresponds to an explosion-proof valve 211. When the explosion-proof valve 211 is open or not open, the electrolyte in the battery device 200 flows out and enters the corresponding accommodating portion 121, preventing the electrolyte flow from causing an internal short circuit in the battery device 200, thereby improving the safety of the battery device 200. The electrolyte enters the corresponding accommodating portion 121 and electrically connects with the first conductive extension 133 corresponding to that position, causing the electrical parameters of the conductive member 130 to change. The BMS can determine the specific location of the electrolyte leakage based on the corresponding electrical parameters.

[0104] It is not difficult to understand that each opening 111 corresponds to a first conductive extension segment 133. When the early warning device 100 is applied to the battery device 200, each explosion-proof valve 211 is opposite to the corresponding first conductive extension segment 133. Each explosion-proof valve 211 can cause the electrical parameters of the conductive member 130 to change when the battery device 200 thermally runs away or an accident occurs, thereby improving the reliability and accuracy of the early warning device 100 in detecting the electrical parameters of the battery device 200, thereby improving the safety of the battery device 200.

[0105] In addition, a third conductive extension segment 135 is connected between each first conductive extension segment 133 and the second conductive extension segment 134, so that there is a distance between the first conductive extension segment 133 and the explosion-proof valve 211 along the first direction to prevent the explosion-proof valve 211 and the first conductive extension segment 133 from interfering with or accidentally touching each other, thereby improving the detection accuracy and reliability of the early warning device 100 and further improving the safety of the battery device 200.

[0106] In combination with the above embodiment, the conductive member 130 has a connecting section 132, and the connecting section 132 is used to electrically connect to the BMS of the battery device 200. Figure 4 In an optional embodiment, at least one second conductive extension segment 134 forms a connecting segment 132 , and in a plane perpendicular to the first direction, the connecting segment 132 is located on at least one side of the first insulating member 110 .

[0107] It is easy to understand that one or more of the plurality of second conductive extension segments 134 form a connecting segment 132 . The connecting segment 132 may be located on one side or multiple sides of the first insulating member 110 and connected to and electrically connected to the BMS.

[0108] Combine Figure 4 and Figure 5The two second conductive extensions 134 form two connecting segments 132, which are located on the same side of the first insulating member 110 and electrically connected to the BMS. Thus, by connecting the connecting segments 132 located on the same side of the first insulating member 110 and the BMS, the structural layout of the conductive member 130 and the circuit layout of the BMS of the battery device 200 are simplified, thereby improving the integration of the BMS and the battery device 200 and facilitating the assembly and production of the battery device 200.

[0109] In some embodiments, at least one third conductive extension segment 135 forms a connecting segment 132 . In a plane perpendicular to the first direction, the connecting segment 132 is located on at least one side of the first insulating member 110 .

[0110] In the embodiment of the present application, one or more of the plurality of third conductive extension segments 135 form a connecting segment 132 . The connecting segment 132 may be located on one side or multiple sides of the first insulating member 110 and connected to and electrically connected to the BMS.

[0111] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The early warning device 100 further includes an adapter 140 , which is connected to the connecting section 132 of the conductive member 130 and is used to electrically connect the conductive member 130 and the battery management system 220 .

[0112] Exemplarily, the adapter 140 is a connector, which respectively connects the connecting section 132 of the conductive member 130 and the BMS. Through the setting of the connector, the early warning device 100 and the BMS can be connected and electrically conductive only by simply plugging the connector, thereby facilitating the assembly of the early warning device 100 and the battery device 200.

[0113] In some embodiments, the adapter 140 may also be a flexible printed circuit (FPC).

[0114] Exemplarily, the conductive member 130 includes a bent structure. It is understood that the bent structure can be a broken line structure, a sine waveform structure, a cosine waveform structure, a square waveform structure, etc., and the embodiment of the present application does not make specific requirements on this.

[0115] like Figure 4 As shown, in some embodiments, the orthographic projection of the folded structure on the plane of the first insulating member 110 is serpentine. The serpentine folded structure can increase the length and contact area of ​​the conductive path, facilitate the connection section 132 of the conductive member 130 to be led out from the same side of the warning device 100 and connected to the BMS for electrical conduction, and also increase the heat dissipation area of ​​the conductive member 130, thereby improving the safety of the battery device 200.

[0116] In some embodiments, the conductive member 130 is formed by etching or die-cutting. As will be appreciated, etching or die-cutting the conductive member 130 simplifies and facilitates the shaping of the conductive member 130 , thereby improving the productivity of the conductive member 130 . Furthermore, the single-step processing of the conductive member 130 enhances its integrity, thereby ensuring a stable electrical connection for the conductive member 130 , thereby increasing the reliability of the early warning device 100 and, when the early warning device 100 is used in the battery device 200 , improving the safety of the battery device 200 .

[0117] In addition, etching and die-cutting can ensure that the surface of the conductive member 130 is smooth and the edges are neat, thereby reducing the internal resistance of the warning device 100 and the energy loss of the warning device 100.

[0118] In some embodiments, after the explosion-proof valve 211 is detached from the battery device 200, the impact force of the explosion-proof valve 211 acts on the conductive member 130, causing the detection segment 131 of the conductive member 130 to break, thereby causing a change in the electrical parameters. Alternatively, after the explosion-proof valve 211 is detached from the battery device 200, the electrolyte within the battery device 200 flows through the opening 111 to the detection segment 131. The relatively high temperature of the electrolyte can melt the detection segment 131 of the conductive member 130 due to the electrolyte temperature, thereby causing a change in the electrical parameters of the conductive member 130.

[0119] Therefore, as an optional embodiment of the present application, the cross-sectional profile of the conductive member 130 is circular, and the diameter of the conductive member 130 is D, wherein D satisfies: 0.05 mm ≤ D ≤ 1 mm.

[0120] For example, the diameter D of the conductive member 130 may be 0.05 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. It should be noted that the diameter of the conductive member 130 is not limited to the above examples, and any diameter that meets the above numerical range requirements can be used. In addition, the embodiments of the present application do not impose any restrictions on the specific diameter of the conductive member 130.

[0121] In this way, by selecting a reasonable diameter of the conductive part 130, the processing difficulty of the conductive part 130 through etching or die-cutting is reduced, which helps to improve the production efficiency of the early warning device 100. Furthermore, the conductive part 130 breaks and / or melts faster under the impact force of the explosion-proof valve 211 and / or the temperature of the electrolyte, making the early warning device 100 more reliable, accurate and stable in detecting the explosion-proof valve 211 and electrolyte leakage of the battery device 200.

[0122] In some embodiments, the tensile strength of the conductive member 130 is S, where S satisfies: 10 MPa≤S≤50 MPa.

[0123] Exemplarily, the tensile strength S of the conductive part 130 can be 10MPa, 15MPa, 20MPa, 25MPa, 30MPa, 35MPa, 40MPa, 45MPa, 50MPa, etc. It should be noted that the tensile strength of the conductive part 130 is not limited to the above examples, and any tensile strength that meets the above numerical range requirements can be used, and the embodiments of the present application do not limit the specific tensile strength of the conductive part 130.

[0124] In this way, through such a conductive member 130, after the explosion-proof valve 211 is detached from the battery device 200, the impact force of the explosion-proof valve 211 acts on the first conductive extension segment 133 of the conductive member 130, which can ensure that the first conductive extension segment 133 breaks quickly, thereby improving the reliability and accuracy of the warning device 100's warning detection of thermal runaway of the battery device 200.

[0125] In some embodiments, the melting point of the conductive member 130 is T, where T satisfies: 130° C. ≤ T ≤ 300° C.

[0126] Optionally, the melting point T of the conductive part 130 can be 130°C, 150°C, 200°C, 250°C, 260°C, 280°C, 300°C, etc. It should be noted that the melting point of the conductive part 130 is not limited to the above examples, and any value that meets the above numerical range requirements can be used, and the embodiments of the present application do not limit the specific melting point of the conductive part 130.

[0127] In this way, through such a conductive member 130, after the explosion-proof valve 211 is detached from the battery device 200, the high-temperature liquid or fire in the battery device 200 is ejected from the explosion-proof valve 211 and acts on the first conductive extension segment 133 of the conductive member 130 to ensure that the first conductive extension segment 133 is quickly melted, thereby improving the reliability and accuracy of the warning detection of thermal runaway of the battery device 200 by the warning device 100.

[0128] For example, the conductive member 130 may be an aluminum member, an aluminum-based alloy member, a tin member, a tin-based alloy member, etc., and the embodiment of the present application does not make specific requirements for this.

[0129] Secondly, see Figure 1 The embodiment of the present application may further provide a battery device 200, including: a battery assembly 210, a battery management system 220 and the early warning device 100 provided in the first aspect.

[0130] The battery assembly 210 has an explosion-proof valve 211. The early warning device 100 is located on at least one side of the battery assembly 210. The explosion-proof valve 211 passes through the opening 111 of the early warning device 100 and faces the detection section 131 of the conductive member 130 of the early warning device 100. The battery management system 220 is electrically connected to the battery assembly 210 and the early warning device 100. The battery management system 220 is used to obtain the voltage value of the conductive member 130 and issue a warning signal based on the obtained voltage value.

[0131] Since the battery device 200 provided in the embodiment of the present application includes the warning device 100 provided in the first aspect, the warning device 100 generates a warning signal by monitoring the explosion-proof valve 211 and the electrolyte of the battery device 200, thereby improving the safety of the battery device 200.

[0132] In some embodiments, the battery assembly 210 includes a plurality of battery cells 212, and the plurality of battery cells 212 can be connected in series. An explosion-proof valve 211 is provided on each battery cell 212, and the explosion-proof valve 211 can be located on the end face on the same side of the battery assembly 210 or on the end faces on different sides. The embodiment of the present application does not make specific requirements for this. It should be noted that there are also multiple openings 111 on the first insulating member 110 of the early warning device 100, and the openings 111 and the explosion-proof valves 211 are provided in a one-to-one correspondence. Among them, the setting method of the corresponding specific structures on the conductive member 130 and the second insulating member 120 has been described in each embodiment of the first aspect above, and will not be repeated here.

[0133] See Figure 1 、 Figure 2 、 Figure 6 and Figure 7 In some embodiments, a battery cell 212 includes a housing 2121, a positive electrode post 2122, and a negative electrode post 2123. Both the positive electrode post 2122 and the negative electrode post 2123 are disposed on the housing 2121, and the positive electrode post 2122 and the housing 2121 are electrically connected. The housing 2121 is also electrically connected to the battery management system 220. It will be appreciated that when multiple battery cells 212 are connected in series, the positive electricity output by the positive electrode post 2122 of each battery cell 212 can be electrically connected to the housing 2121 via an electrical connector, thereby positively charging the housing 2121.

[0134] In some embodiments, see Figure 1 、 Figure 2Battery assembly 200 also includes a bracket 230, which is positioned on the side of warning device 100 facing away from battery assembly 210. Battery management system 220 is connected to the side of bracket 230 facing away from warning device 100. Bracket 230 thus supports and secures the BMS, ensuring stable connections among the various components of battery assembly 200. Furthermore, bracket 230 isolates battery management system 220 from battery assembly 210, enhancing the safety of battery assembly 200.

[0135] The following combination Figure 8 The working principle of the BMS acquiring the voltage of the conductive member 130 is described.

[0136] In some embodiments, the battery management system 220 includes a first control module 221, a first resistor 222, a second resistor 223, a preset power supply 224 and a first voltage detection module 225. The first control module 221, the first resistor 222, the conductive element 130 and the second resistor 223 are connected in series and electrically conductive to the preset power supply 224; the first voltage detection module 225 and the conductive element 130 are connected in parallel.

[0137] When the circuit of the first control module 221 is turned on, the first resistor 222, the conductive element 130, and the second resistor 223 are sequentially connected in series to the preset power supply 224. This allows the normal operating voltage of the conductive element 130 to be obtained through the voltage distribution principle of the series circuit. When the voltage value of the conductive element 130 obtained by the first voltage detection module 225 is compared with the normal operating voltage of the conductive element 130, if the voltage value of the conductive element 130 obtained by the first voltage detection module 225 is equal to the normal operating voltage of the conductive element 130, the explosion-proof valve 211 has not been detached from the battery assembly 210, and accordingly, the battery device 200 has not experienced thermal runaway. If the voltage value of the conductive element 130 obtained by the first voltage detection module 225 is 0V, the BMS can generate a warning signal. This is because the battery is in thermal runaway, and the impact force of the explosion-proof valve 211 acts on the detection section 131 of the conductive element 130, causing the conductive element 130 to disconnect, resulting in the voltage value of the conductive element 130 becoming 0V.

[0138] In some embodiments, the resistance value of the first resistor 222 is equal to the resistance value of the second resistor 223. This simplifies the BMS's calculation of the voltage in the circuit, thereby quickly responding to the voltage value of the conductive member 130 detected by the first voltage detection module, and quickly issuing a warning signal, allowing the user to quickly respond and take rescue measures, thereby reducing secondary hazards caused by thermal runaway of the battery device 200.

[0139] In some embodiments, the battery management system 220 includes a second control module 226 and a second voltage detection module 227 ; the second voltage detection module 227 is electrically connected to the negative electrode of the battery assembly 210 and the conductive member 130 , respectively.

[0140] It is not difficult to understand that the shell 2121 of the battery assembly 210 is positively charged. When the electrolyte leaks, the electrolyte enters the accommodating portion 121, making the shell 2121 of the battery assembly 210 and the conductive member 130 electrically conductive. The second voltage detection module 227 can obtain the voltage value of the conductive member 130. The BMS determines the leakage location of the electrolyte based on the voltage value, and at the same time generates an early warning signal and sends it to the user for maintenance of the battery assembly 210.

[0141] In some embodiments, the first conductive extension 133 of the conductive member 130 extends along the length of the explosion-proof valve 211. It is readily understood that the first conductive extension 133 forms the detection segment 131. That is, the detection segment 131 extends along the length of the explosion-proof valve 211. This increases contact between the explosion-proof valve 211 and the detection segment 131 after the explosion-proof valve 211 is detached, ensuring that the detection segment 131 can be disconnected under the action of the explosion-proof valve 211. This improves the detection accuracy and reliability of the early warning device 100, thereby enhancing the safety of the battery device 200.

[0142] like Figure 9 As shown, in a third aspect, an embodiment of the present application provides an electric device 300, including the battery device 200 provided in the second aspect.

[0143] The electrical device 300 in the embodiment of the present application may be a vehicle, for example: the vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.

[0144] In addition, the electrical device 300 may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecraft, etc., where the spacecraft may include airplanes, rockets, space shuttles or spacecraft.

[0145] It should be noted that references in this specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," and the like indicate that the described embodiment may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0146] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0147] It should be readily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes the meaning of “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0148] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90° or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An early warning device, characterized in that: Applied to a battery device (200), the battery device (200) having an explosion-proof valve (211); The early warning device (100) comprises: A first insulating member (110), wherein the first insulating member (110) has an opening (111); a second insulating member (120), the second insulating member (120) and the first insulating member (110) being arranged opposite to each other; a conductive member (130), the conductive member (130) being located between the first insulating member (110) and the second insulating member (120); a detection section (131) of the conductive member (130) facing the opening (111); and a connection section (132) of the conductive member (130) being used for electrically connecting to a battery management system (220) of the battery device; When the early warning device (100) and the battery device are connected in a coordinated manner, the explosion-proof valve (211) is opposite to the detection section (131) through the opening (111).

2. The early warning device according to claim 1, characterized in that: Along the first direction, the detection section (131) and the first insulating member (110) are spaced apart so that when the early warning device (100) and the battery device are connected in a coordinated manner, the explosion-proof valve (211) and the detection section (131) are opposite and spaced apart. The first direction is along the relative direction of the first insulating member (110) and the second insulating member (120).

3. The early warning device according to claim 1, characterized in that: The second insulating member (120) has a receiving portion (121), the receiving portion (121) and the opening (111) are correspondingly arranged, and the detection section (131) is located in the receiving portion (121) and faces the opening (111).

4. The early warning device according to claim 3, characterized in that: The conductive member (130) has a first conductive extension segment (133), the first conductive extension segment (133) forms the detection segment (131), and the first conductive extension segment (133) is located in the accommodating portion (121); When the early warning device (100) and the battery device (200) are connected in cooperation, the orthographic projection of the first conductive extension section (133) on the surface where the end face of the explosion-proof valve (211) is located is covered by the end face of the explosion-proof valve (211).

5. The early warning device according to claim 4, characterized in that: The conductive member (130) further includes a second conductive extension segment (134), wherein the second conductive extension segment (134) and the first conductive extension segment (133) are arranged along a first direction; In a plane perpendicular to the first direction, the extension direction of the second conductive extension segment (134) intersects with the extension direction of the first conductive extension segment (133); The first direction is along the relative direction of the first insulating member (110) and the second insulating member (120).

6. The early warning device according to claim 5, characterized in that: Along the first direction, the second conductive extension segment (134) and the first conductive extension segment (133) are arranged at intervals.

7. The early warning device according to claim 6, characterized in that: The conductive member (130) further includes a third conductive extension segment (135), two ends of the third conductive extension segment (135) are respectively connected to the first conductive extension segment (133) and the second conductive extension segment (134); The third conductive extension segment (135) extends along the first direction, so that the second conductive extension segment (134) and the first conductive extension segment (133) are spaced apart along the first direction.

8. The early warning device according to claim 7, characterized in that: There are multiple openings (111), and the openings (111) are used to correspond one-to-one with the multiple explosion-proof valves (211) on the battery device (200); There are multiple accommodating portions (121), and the accommodating portions (121) correspond to the openings (111) one by one; There are a plurality of first conductive extension segments (133), and the first conductive extension segments (133) and the openings (111) correspond one to one; There are a plurality of second conductive extension segments (134), and the second conductive extension segments (134) and the first conductive extension segments (133) are arranged alternately; There are a plurality of third conductive extension segments (135), and each of the third conductive extension segments (135) connects adjacent first conductive extension segments (133) and second conductive extension segments (134).

9. The early warning device according to claim 8, characterized in that: At least one of the second conductive extension segments (134) forms the connecting segment (132). In a plane perpendicular to the first direction, the connecting segment (132) is located on at least one side of the first insulating member (110).

10. The early warning device according to claim 8, characterized in that: At least one of the third conductive extension segments (135) forms the connecting segment (132); in a plane perpendicular to the first direction, the connecting segment (132) is located on at least one side of the first insulating member (110).

11. The early warning device according to claim 1, characterized in that: It also includes an adapter (140), which is connected to the connecting section (132) of the conductive member (130) and is used for electrically connecting the conductive member (130) and the battery management system (220).

12. The early warning device according to claim 1, characterized in that: The conductive member (130) comprises a bent structure.

13. The early warning device according to claim 12, characterized in that: The orthographic projection of the bending structure on the plane where the first insulating member (110) is located is in a serpentine shape.

14. The early warning device according to any one of claims 1 to 13, characterized in that: The conductive member (130) is formed by etching or die cutting.

15. The early warning device according to any one of claims 1 to 13, characterized in that: The cross-sectional profile of the conductive member (130) is circular, the diameter of the conductive member (130) is D, and D satisfies: 0.05 mm ≤ D ≤ 1 mm; And / or, the tensile strength of the conductive member (130) is S, and S satisfies: 10MPa≤S≤50MPa; And / or, the melting point of the conductive member (130) is T, and T satisfies: 130°C≤T≤300°C.

16. The early warning device according to claim 3, characterized in that: The second insulating member (120) has a protrusion (122), and the protrusion (122) forms the receiving portion (121).

17. A battery device, characterized in that: include: A battery assembly (210), wherein the battery assembly (210) has an explosion-proof valve (211); The early warning device (100) according to any one of claims 1 to 16, wherein the early warning device (100) is arranged on at least one side of the battery assembly (210), and the explosion-proof valve (211) passes through the opening (111) of the early warning device (100) and is opposite to the detection section (131) of the conductive member (130) of the early warning device (100); A battery management system (220) is provided, wherein the battery management system (220) is electrically connected to the battery assembly (210) and the warning device (100), and the battery management system (220) is used to obtain a voltage value of the conductive member (130) and to issue a warning signal according to the obtained voltage value.

18. The battery device according to claim 17, characterized in that The battery assembly (210) includes a plurality of battery cells (212), each of the battery cells (212) includes a housing (2121), a positive electrode column (2122), and a negative electrode column (2123), the positive electrode column (2122) and the negative electrode column (2123) are both arranged on the housing (2121), and the positive electrode column (2122) and the housing (2121) are electrically connected; The housing (2121) and the battery management system (220) are electrically connected.

19. The battery device according to claim 17, wherein: It also includes a bracket (230), the bracket (230) being arranged on a side of the early warning device (100) facing away from the battery assembly (210); The battery management system (220) is connected to a side of the bracket (230) facing away from the early warning device (100).

20. The battery device according to claim 18, wherein: The battery management system (220) comprises a first control module (221), a first resistor (222), a second resistor (223), a preset power supply (224) and a first voltage detection module (225); the first control module (221), the first resistor (222), the conductive element (130) and the second resistor (223) are connected in series and electrically connected to the preset power supply (224); the first voltage detection module (225) and the conductive element (130) are connected in parallel; And / or, the battery management system (220) includes a second control module (226) and a second voltage detection module (227); the second voltage detection module (227) is electrically connected to the negative electrode of the battery assembly (210) and the conductive member (130), respectively.

21. The battery device according to claim 17, wherein: The first conductive extension section (133) of the conductive member (130) extends along the length direction of the explosion-proof valve (211).

22. The battery device according to claim 17, wherein: The battery assembly (210) has a plurality of explosion-proof valves (211), and the explosion-proof valves (211) correspond to the openings (111) of the early warning device (100) in a one-to-one manner.

23. An electrical device, characterized in that: include: The battery device (200) according to any one of claims 17 to 22.

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