Battery health monitoring system and vehicle

Abstract

A battery health monitoring system (100) and a vehicle. The battery health monitoring system (100) comprises: a battery (1), the battery (1) comprising a casing (11) and a battery main body (12) located in the casing (11), and the casing (11) being provided with a monitoring hole (110); a monitoring unit (2), the monitoring unit (2) comprising a first electrode sheet (21) sealingly connected to the monitoring hole (110), a second electrode sheet (22) spaced apart from the first electrode sheet (21), and a capacitance monitor electrically connected to both the first electrode sheet (21) and the second electrode sheet (22), and the first electrode sheet (21) and the casing (11) forming an enclosed space sealing the battery main body (12). By means of measuring in real time a capacitance value, a change in capacitance value, or a rate of change of a capacitance value between the first electrode sheet (21) and the second electrode sheet (22), the battery health monitoring system (100) acquires a gas generation condition of the interior of the battery, and the sensitivity is high, so that determination can be made in a timely manner in the early stages of a decrease in the health of the battery, and a user is alerted to pay close attention to the health of the battery.

Description

Battery health monitoring system and vehicle TECHNICAL FIELD

[0001] The present application relates to a battery health management, in particular to a battery health monitoring system and vehicle. BACKGROUND

[0002] At present, storage batteries are widely used in various aspects of industrial production and daily life. With the popularity of new energy vehicles and frequent reports of battery self-ignition and explosion accidents, the safety of new energy vehicle storage batteries has been pushed to the forefront, and has gradually become one of the most concerned problems of users.

[0003] When the storage battery fails or the battery ages, the electrolyte inside will decompose to produce gas, and as the amount of gas produced increases, it will also cause the battery to bulge and deform, and further cause internal short circuit, fire and explosion accidents. Therefore, it is necessary and urgent to develop a monitoring system for the health of the storage battery, especially a monitoring system that can give an early warning in the early stage of the decline of the battery health.

[0004] The common storage battery safety monitoring method at present is pressure monitoring, which requires additional pressure sensing elements to sense the pressure changes around the battery. The problem with this monitoring method is that only when the amount of gas generated in the storage battery reaches a certain level and the gas expansion causes the deformation of the storage battery shell, the corresponding pressure change can be monitored, the sensitivity is relatively low, the early warning function is lagging, and the configuration occupies a large space and has a high cost.

[0005] Therefore, it is necessary to improve the existing battery health monitoring system and vehicle to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a battery health monitoring system and vehicle to improve the sensitivity of battery health monitoring and solve at least one of the above technical problems.

[0007] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0008] The application discloses a battery health monitoring system, which comprises a battery, a battery main body in a shell, a monitoring hole on the shell, a monitoring unit, a first electrode sheet in sealing connection with the monitoring hole, a second electrode sheet, and a capacitor monitor; the first electrode sheet forms a sealed space with the shell and the battery main body, and the first electrode sheet is an elastic sheet; the second electrode sheet comprises an inductor part and a fixing part for fixing the inductor part; the first electrode sheet and the inductor part are electrically connected with the capacitor monitor.

[0009] In an optional embodiment, the first electrode sheet comprises a first sheet and a first conductive layer on the surface of the first sheet.

[0010] In an optional embodiment, the first sheet is a fluorine-containing rubber, preferably selected from viton or PFA; the conductive layer is selected from at least one or a combination of multiple kinds of metal paste layers, conductive non-metal paste layers or metal sheets; the metal paste layer is selected from at least one or a combination of multiple kinds of silver paste layers, copper paste layers or aluminum paste layers; the conductive non-metal paste layer is selected from at least one or a combination of multiple kinds of carbon paste layers, graphene layers and carbon nanotube layers; and the metal sheet is selected from at least one or a combination of multiple kinds of copper sheets, silver sheets, silver-copper alloy sheets and aluminum-copper alloy sheets.

[0011] In an optional embodiment, the elastic modulus of the first electrode sheet is not higher than 3.0 MPa, and / or the thickness of the first electrode sheet is 1 mm to 3 mm.

[0012] In an optional embodiment, the area of the first electrode sheet is greater than that of the monitoring hole, and the first electrode sheet is attached to the outside of the shell; or, the first electrode sheet is embedded in the monitoring hole; or, the monitoring hole of the shell is provided with a mounting part, and the first electrode sheet is fixed on the mounting part.

[0013] In an optional embodiment, the first electrode sheet and the second electrode sheet are integrally arranged, the area of the first electrode sheet is greater than that of the monitoring hole, and the first electrode sheet is attached to the outside of the shell; or, the first electrode sheet is embedded in the monitoring hole; or, the monitoring hole of the shell is provided with a mounting part, and the first electrode sheet and / or the second electrode sheet are fixed on the mounting part.

[0014] In an optional embodiment, the first electrode sheet and the second electrode sheet are arranged separately, the area of the first electrode sheet is greater than the area of the monitoring hole, and the first electrode sheet is attached to the outside of the shell; or, the first electrode sheet is embedded in the monitoring hole; or, the monitoring hole of the shell is provided with a mounting portion, and the first electrode sheet is fixed on the mounting portion; the second electrode sheet is connected to the shell by a fastener, or the second electrode sheet is welded or pasted on the shell, or the second electrode sheet is connected to the shell in an interference fit, or the second electrode sheet is detachably fixed to the shell by a fixing seat.

[0015] In an optional embodiment, the first electrode sheet comprises a first sheet and a first conductive layer on the first sheet, and the first conductive layer is on the surface of the first sheet facing the inductor portion; the inductor portion comprises a second sheet and a second conductive layer on the second sheet, and the second conductive layer is on the surface of the second sheet facing the first electrode sheet; and the first conductive layer and the second conductive layer are made of the same material.

[0016] In an optional embodiment, the initial distance between the first electrode sheet and the inductor portion is d1, the maximum deformation of the first electrode sheet is d2, and d2 is 50% to 80% of d1.

[0017] In an optional embodiment, the battery health monitoring system further comprises a resistance monitor electrically connected to the first electrode sheet.

[0018] In an optional embodiment, the battery health monitoring system further comprises a pre-warning module, and the pre-warning module is in communication connection with the monitoring unit.

[0019] In an optional embodiment, the battery health monitoring system further comprises a pre-warning module and a control module, and the control module is in communication connection with the pre-warning module and the monitoring unit.

[0020] A vehicle comprising the battery health monitoring system.

[0021] The battery health monitoring system of the present application can obtain the gas generation condition inside the battery by detecting the capacitance value or capacitance value change amount or capacitance value change rate between the first electrode sheet and the second electrode sheet in real time, so that the first electrode sheet can also elastically deform under the action of gas pressure, and the capacitance value rise caused by the deformation amount can be monitored in real time, the sensitivity is high, the judgment can be made in the budding period of the battery health decline (when the bulge has not occurred), the user is reminded to pay attention to the health of the battery, so as to check the safety hazard of the battery as soon as possible and replace the battery, effectively prevent the occurrence of safety accidents, greatly improve the use safety of the new energy vehicle, and the monitoring system and the battery are designed in an integrated manner, the structure is compact, and the detection cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 is a structural schematic diagram of a battery health monitoring system in an embodiment of the present application;

[0023] Fig. 2 is a partial enlarged view of A in Fig. 1;

[0024] Fig. 3 is a schematic diagram of Fig. 2 when the battery bulges;

[0025] Fig. 4 is a structural schematic diagram of a first electrode sheet in Fig. 1;

[0026] Fig. 5 is a schematic diagram of a first electrode sheet in another embodiment of the present application;

[0027] Fig. 6 is a top view of Fig. 5;

[0028] Fig. 7 is a schematic diagram of a first electrode sheet in another embodiment of the present application;

[0029] Fig. 8 is a structural schematic diagram of a battery health monitoring system in another embodiment of the present application;

[0030] Fig. 9 is a partial enlarged view of B in Fig. 8;

[0031] Fig. 10 is a structural schematic diagram of a battery health monitoring system in another embodiment of the present application;

[0032] Fig. 11 is a structural schematic diagram of a battery health monitoring system in another embodiment of the present application;

[0033] Fig. 12 is a structural schematic diagram of a battery health monitoring system in another embodiment of the present application;

[0034] Fig. 13 is an exploded view of Fig. 12.

[0035] Wherein, 100-battery health monitoring system, 1-battery, 11-housing, 110-monitoring hole, 111-first limit structure, 112-second limit structure, 113-mounting portion, 12-battery main body, 2-monitoring unit, 21-first electrode sheet, 211-first sheet, 212-first conductive layer, 213-anti-corrosion layer, 22-second electrode sheet, 221-inductive portion, 222-fixing portion. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is described in detail below with specific examples.

[0037] The present application provides a battery health monitoring system, which can monitor the corresponding signal at the budding period of battery health decline, so as to find out the battery safety hazard as soon as possible and effectively prevent the occurrence of safety accidents.

[0038] Please refer to the battery health monitoring system 100 shown in FIG. 1-13, which includes a battery 1 and a monitoring unit 2, the monitoring unit 2 is used to monitor the health of the battery 1, and give a risk signal in time.

[0039] The battery 1 is a storage battery 1, including but not limited to lead-acid storage battery, nickel-cadmium storage battery, nickel-hydrogen battery, lithium ion battery, etc.

[0040] Specifically, the battery 1 includes a housing 11 and a battery main body 12 located in the housing 11. The housing 11 is made of ABS plastic, or PP plastic, or HDPE resin, etc. hard material, which protects the internal battery main body 12; the battery main body 12 contains electrolyte, when the battery 1 fails or the battery ages, the internal electrolyte will decompose to produce gas, with the increase of the amount of gas produced, it will cause the temperature and pressure in the housing 11 to increase, the battery bulging deformation, and then cause the internal short circuit, fire and explosion of the battery. The other structure of the battery 1 refers to the related technology, which is not described here.

[0041] The housing 11 is provided with a monitoring hole 110 for installing the monitoring unit 2. The monitoring hole 110 is located on the top wall or side wall of the housing 11. Considering that the gas generated in the closed space of the housing 11 will diffuse upward first, the monitoring hole 110 is preferably located on the top wall, which can further improve the sensitivity of the battery health monitoring system 100.

[0042] The housing 11 is provided with a plurality of monitoring holes 110, and a plurality of monitoring units 2 are installed correspondingly. A plurality of monitoring units 2 are distributed at different parts of the housing 11, and are monitored in multiple areas, which is more accurate; and it can prevent unnecessary risks caused by the failure or error of a certain monitoring unit 2.

[0043] The monitoring unit 2 comprises a first electrode sheet 21 and a second electrode sheet 22 in sealed connection with the monitoring hole 110, and a capacitance monitor in electrical connection with the first electrode sheet 21 and the second electrode sheet 22.

[0044] In the present application, the first electrode sheet 21 is in sealed connection with the monitoring hole 110, which means that the first electrode sheet 21 seals the monitoring hole 110, and the first electrode sheet 21 and the shell 11 form a sealed space, and the battery body 12 is located in the sealed space.

[0045] The inductance part 221 of the first electrode sheet 21 and the second electrode sheet 22 constitutes a capacitor, and the first electrode sheet 21 is an elastic sheet, and the capacitance changes with the distance between the first electrode sheet 21 and the inductance part 221. When the battery 1 is working normally, the air pressure in the sealed space is basically constant, the first electrode sheet 21 is not subjected to pressure, and the distance between the first electrode sheet 21 and the inductance part 221 remains at the initial distance d1, and the measured capacitance is within the threshold value. When the battery 1 fails initially, gas is generated in the sealed space, and the air pressure in the sealed space gradually increases, and the extrusion of the air pressure causes the first electrode sheet 21 to deform towards the inductance part 221, and the distance between the first electrode sheet 21 and the inductance part 221 decreases, and the capacitance value between the two increases, and when the capacitance value or the capacitance value increment or the capacitance value growth rate reaches the corresponding predetermined threshold value, it indicates that the health degree of the battery 1 is low, and safety inspection or replacement is required.

[0046] In an optional embodiment, the elastic modulus of the first electrode sheet 21 is not higher than 3.0 MPa, which ensures sufficient elasticity, so that when the pressure in the battery 1 increases, the first electrode sheet 21 deforms elastically in time and by a sufficient amount, causing the capacitance between the first electrode sheet 21 and the second electrode sheet 22 to change.

[0047] In an optional embodiment, the thickness of the first electrode sheet 21 is 1 mm to 3 mm, and when the pressure in the battery 1 increases, the first electrode sheet 21 deforms elastically in time and by a sufficient amount, causing the capacitance between the first electrode sheet 21 and the second electrode sheet 22 to change.

[0048] In the present application, referring to FIGS. 1-13, the first electrode sheet 21 comprises a first sheet 211 and a first conductive layer 212 located on the surface of the first sheet 211. The first sheet 211 constitutes a substrate, and the first conductive layer 212 serves as an electrode and an inductance part 221 to constitute the capacitor.

[0049] The first sheet 211 is preferably a fluorine-containing rubber, which can resist corrosion of the electrolyte in the battery body 12, improve the durability of the battery 1, and itself has elasticity, which can be elastically deformed when receiving pressure. Alternatively, the sheet is viton or PFA, which has both elasticity and corrosion resistance.

[0050] The first conductive layer 212 is selected from at least one or a combination of a plurality of metal paste layers, conductive non-metal paste layers, or metal sheets. The metal paste layer is selected from at least one or a combination of a plurality of silver paste layers, copper paste layers, or aluminum paste layers; the conductive non-metal paste layer is selected from at least one or a combination of a plurality of carbon paste layers, graphene layers, or carbon nanotube layers; and the metal sheet is selected from at least one or a combination of a plurality of copper sheets, silver sheets, silver-copper alloy sheets, or aluminum-copper alloy sheets.

[0051] In one embodiment, as shown in FIGS. 2 and 3, the first conductive layer 212 is located on the outer surface of the first sheet 211, which can prevent the electrolyte in the battery body 12 from corroding the first conductive layer 212, thereby ensuring the accuracy of the monitoring system.

[0052] In another embodiment, as shown in FIG. 7, the first conductive layer 212 is located on the inner surface of the first sheet 211, and the first electrode sheet 21 further comprises an anti-corrosion layer 213 located on the inner side of the first conductive layer 212, which prevents the electrolyte from corroding the first conductive layer 212.

[0053] The elastic coefficient of the anti-corrosion layer 213 is not less than that of the first sheet 211, so as not to restrict the elastic deformation of the first sheet 211. The material of the anti-corrosion layer 213 can be the same as that of the first sheet 211.

[0054] The connection mode of the first electrode sheet 21 and the shell 11 includes but is not limited to the following modes.

[0055] In one embodiment, as shown in FIGS. 1 to 7, the area of the first electrode sheet 21 is greater than that of the monitoring hole 110, and the first electrode sheet 21 is attached to the outer side of the shell 11 and fixed by pressurized attachment or adhesive attachment, which is simple in process. Of course, other attachment modes can also be used.

[0056] On this basis, as shown in FIG. 4, the first conductive layer 222 covers the entire surface of the first sheet 211. Alternatively, as shown in FIGS. 5 and 6, the first conductive layer 222 is located in the middle region of the first sheet 211, and the edge is attached to the shell 11 and does not elastically deform, so that the first conductive layer 222 is not provided and does not affect the capacitance measurement.

[0057] In another embodiment, as shown in FIGS. 8-11, the first electrode sheet 21 is embedded in the monitoring hole 110.

[0058] In one embodiment, as shown in FIGS. 8-10, the first electrode sheet 21 is installed in the monitoring hole 110 in a tight fit to achieve sealing. Specifically, the first electrode sheet 21 and the monitoring hole 110 are shaped and sized to match each other, and the first electrode sheet 21 is installed in a tight fit by virtue of its own elasticity.

[0059] In an optional embodiment, the area of the monitoring hole 110 first increases and then decreases in the direction from outside to inside, so as to hold the first electrode sheet 21 in the monitoring hole 110. Alternatively, the housing further comprises a first limiting structure 111 at the outer end of the monitoring hole 110 and a second limiting structure 112 at the inner end thereof, and the first electrode sheet 21 is held between the first limiting structure 111 and the second limiting structure 112 to prevent falling off and improve the sealing performance.

[0060] In another embodiment, as shown in FIG. 11, the first electrode sheet 21 is screwed in the monitoring hole 110, which is convenient to install and has good sealing performance. Specifically, the inner side wall of the monitoring hole 110 is provided with a thread, and the side edge of the first electrode sheet 21 is correspondingly provided with a concave-convex shape matching the inner side wall, so as to ensure the sealed connection between the first electrode sheet 21 and the housing 11.

[0061] In another embodiment, as shown in FIGS. 12 and 13, the housing 11 is provided with a mounting portion 113 at the monitoring hole 110, and the first electrode sheet 21 is fixed on the mounting portion 113, which can be fixed by means of press fitting and / or adhesive bonding, and the process is simple. In this embodiment, the mounting portion 113 is in the form of a step, and in other embodiments, the mounting portion 113 can also have other shapes.

[0062] The second electrode sheet 22 comprises a sheet-shaped inductive portion 221 and a fixed portion 222, the inductive portion 221 and the first electrode sheet 21 form a capacitor, and the first electrode sheet 21 and the inductive portion 221 are both electrically connected to the capacitor monitor 2.

[0063] The inductive portion 221 is made of any sheet material capable of conducting electricity, which can form a capacitor with the first electrode sheet 21. In one embodiment, the inductive portion 221 is a metal sheet, a conductive non-metal sheet (such as carbon, etc.) or a metal and conductive non-metal doped sheet. The metal sheet is selected from, but not limited to, stainless steel sheet, copper sheet, etc., and the conductive non-metal sheet is selected from, but not limited to, carbon, etc.

[0064] In another embodiment, similar to the structure of the first electrode sheet 21, the inductive portion 221 comprises a second sheet material and a second conductive layer on the second sheet material.

[0065] In an optional embodiment, the elasticity of the first sheet 211 is greater than that of the second sheet, which is a rigid sheet and is not easily deformed, so that the capacitance change is only affected by the deformation amount of the first sheet 211.

[0066] In an optional embodiment, the first conductive layer 212 and the second conductive layer are arranged opposite to each other, that is, the first conductive layer 212 is located on the side of the first electrode sheet 21 facing the inductor part 221, and the second conductive layer is located on the side of the inductor part 221 facing the first electrode sheet 21, so that the two conductive layers directly face each other, and the capacitance measurement is not affected by the sheet, and the sensitivity is high.

[0067] In an optional embodiment, the first conductive layer 212 and the second conductive layer are made of the same material, so that the influence of the same material on the movement of charges is fixed, and the change of the capacitance value can be kept consistent during the use of the battery 1 monitoring system, thereby improving the monitoring accuracy.

[0068] The fixing part 222 is used to fix the second electrode sheet 22. In the present application, the fixing part 222 is integrally arranged with the inductor part 221 or is spliced to form an integral body.

[0069] The fixing part 222 is located on one side of the inductor part 221, so that the inductor part 221 is arranged in a spaced manner with the first electrode sheet 21.

[0070] The connection mode of the second electrode sheet 22 with the shell 11 includes but is not limited to the following modes.

[0071] As shown in FIGS. 1-11, when the second electrode sheet 22 is arranged separately from the first electrode sheet 21, the two electrode sheets are fixed with the shell 11 respectively. The first electrode sheet 21 is fixed in the above-mentioned manner; the second electrode sheet 22 can be directly or indirectly fixed with the shell 11.

[0072] In an embodiment, the second electrode sheet 22 is directly connected to the shell 11 by a fastener, which includes but is not limited to a screw, a rivet, etc.

[0073] In another embodiment, the second electrode sheet 22 is directly welded or pasted on the shell 11.

[0074] In another embodiment, the second electrode sheet 22 is directly connected with the mounting hole on the shell 11 in an interference fit.

[0075] In another embodiment, the second electrode sheet 22 is indirectly fixed to the shell 11 in a detachable manner through a fixing seat.

[0076] Of course, the second electrode sheet 22 and the shell 11 can also be fixed in other existing manners.

[0077] When the second electrode sheet 22 is integrally arranged with the first electrode sheet 21, as shown in FIG. 12 and FIG. 13, the fixing with the shell 11 is achieved through the first electrode sheet 21 and / or the second electrode sheet 22. That is, the fixing of the integrally arranged second electrode sheet 22 and the first electrode sheet 21 with the shell 11 is achieved through the fixing mode of the first electrode sheet 21 with the shell 11; or the fixing of the integrally arranged second electrode sheet 22 and the first electrode sheet 21 with the shell 11 is achieved through the fixing mode of the second electrode sheet 22 with the shell 11.

[0078] In an optional embodiment, the fixing part 222 of the second electrode sheet 22 is fixed to the outer side edge of the first electrode sheet 21, and the shape of the combined second electrode sheet 22 and first electrode sheet 21 matches the shape of the mounting part 113, and the second electrode sheet 22 and the first electrode sheet 21 are press-fitted and / or glued to the mounting part 113. The initial distance between the first electrode sheet 21 and the second electrode sheet 22 is d1, and the maximum deformation of the first electrode sheet 21 is d2, which is 50% to 80% of d1, to ensure the sensitivity of the monitoring.

[0079] In a preferred embodiment, the initial distance d1 is 2mm to 10mm.

[0080] The capacitance monitor is electrically connected to the first electrode sheet 21 and the second electrode sheet 22, and detects the capacitance value of the capacitance in real time to monitor the health of the battery 1. In an optional embodiment, the monitoring accuracy of the capacitance monitor is accurate to pF (picofarad), which improves the monitoring sensitivity.

[0081] The inventors have found that the elastic deformation of the first electrode sheet 21 also causes the resistance value of the first electrode sheet 21 to change, for example, to increase. Specifically, when the first electrode sheet 21 is elastically deformed, the first conductive layer 212 may have fine cracks, thereby causing the resistance of the first electrode sheet 21 to increase.

[0082] The battery health monitoring system 100 further comprises a resistance monitor for monitoring the resistance of the first electrode sheet 21, which assists in judging the health of the battery 1 by monitoring the change in the resistance of the first electrode sheet 21.

[0083] In an optional embodiment, the battery health monitoring system 100 further comprises a warning module, which is communicatively connected to the monitoring unit 2, and issues a warning when the capacitance exceeds a warning value. When the real-time capacitance value is greater than a predetermined threshold value of the capacitance value, or the capacitance increment / capacitance growth rate is greater than a corresponding predetermined threshold value, the warning module issues a warning to remind the user that the health of the battery 1 is low, and to check the safety hazards of the battery 1 or replace the battery 1.

[0084] The size of the predetermined threshold value of the capacitance value, the predetermined threshold value of the capacitance value increment, and the predetermined threshold value of the capacitance value growth rate can be determined comprehensively according to the initial capacitance value of the actual capacitance, the effective area of the first electrode sheet 21, the total volume of the battery 1, the environmental temperature, and the like.

[0085] Specifically, the early warning module includes a touch display device, and after starting early warning, the display device displays a graphic or text information corresponding to the over-limit state of the capacitance value, the capacitance value increment, or the capacitance value growth rate, and the graphic or text information is used to prompt the user about the health degree of the battery 1 or the corresponding processing suggestion. The early warning module can also include a sound alarm device, which emits an alarm sound after receiving the signal.

[0086] In an optional embodiment, the battery health monitoring system 100 further includes an early warning module and a control module, and the control module is in communication connection with the early warning module and the monitoring unit 2.

[0087] The control module is preset with the various predetermined threshold values described above, and the output end of the capacitance monitor is connected to the input end of the control module to transmit the real-time detected capacitance value result to the control module.

[0088] The control module compares the real-time detected capacitance value with the preset predetermined threshold value of the capacitance value, outputs the comparison result of the capacitance value to the early warning module, and controls the early warning module to issue early warning information. Alternatively, the control module obtains the capacitance value increment and the capacitance value growth rate through calculation, compares the capacitance value increment and the capacitance value growth rate with the corresponding predetermined threshold values, outputs the comparison result of the capacitance value increment and the capacitance value growth rate to the early warning module, and controls the early warning module to issue early warning information.

[0089] The application also provides a vehicle loaded with the battery health monitoring system described above, thereby improving the safety of the vehicle. In the scenario where the battery health monitoring system is applied to a vehicle, the control module and the early warning module are preferably integrated into the vehicle general control system.

[0090] In summary, the battery health monitoring system 100 of the application can obtain the gas generation condition inside the battery 1 by real-time detection of the capacitance value or the capacitance value change amount or the capacitance value change rate between the first electrode sheet 21 and the second electrode sheet 22, so that a small amount of gas is generated inside the battery 1, and the first electrode sheet 21 can also be elastically deformed under the action of the gas pressure. The capacitance value rise caused by the deformation amount can be monitored in real time, the sensitivity is high, the judgment and early warning prompt can be made at the budding period of the battery 1 health decline (when the bulge has not occurred), the user is reminded to pay attention to the health degree of the battery 1, so as to check the safety hazards of the battery 1 as early as possible and replace the battery 1, effectively prevent the occurrence of safety accidents, greatly improve the use safety of new energy vehicles, and the monitoring system and the battery 1 are designed in an integrated manner, the structure is compact, and the detection cost is low.

[0091] The above examples are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the present application.

Claims

1. A battery health monitoring system, comprising a battery, the battery including a casing and a battery body located within the casing, characterized in that: The housing is provided with a monitoring hole; the battery health monitoring system further includes a monitoring unit, the monitoring unit including a first electrode plate, a second electrode plate, and a capacitance monitor that are sealed and connected to the monitoring hole; the first electrode plate and the housing form a sealed space that seals the battery body, and the first electrode plate is an elastic sheet; the second electrode plate includes an inductor portion and a fixing portion for fixing the inductor portion, which are spaced apart from the first electrode plate; both the first electrode plate and the inductor portion are electrically connected to the capacitance monitor.

2. The battery health monitoring system according to claim 1, characterized in that: The first electrode sheet includes a first sheet and a first conductive layer located on the surface of the first sheet.

3. The battery health monitoring system according to claim 2, characterized in that: The first sheet is a fluorinated rubber, preferably selected from Viton or PFA; The conductive layer is selected from at least one or more combinations of metal paste layer, conductive non-metal paste layer or metal sheet; The metal paste layer is selected from at least one or a combination of silver paste layer, copper paste layer or aluminum paste layer; The conductive non-metallic paste layer is selected from at least one or a combination of carbon paste layer, graphene layer, and carbon nanotube layer; The metal sheet is selected from at least one or more combinations of copper sheet, silver sheet, silver-copper alloy sheet, and aluminum-copper alloy sheet.

4. The battery health monitoring system according to claim 1, characterized in that: The elastic modulus of the first electrode sheet is not higher than 3.0 MPa, and / or the thickness of the first electrode sheet is 1 mm to 3 mm.

5. The battery health monitoring system according to claim 1, characterized in that: The area of ​​the first electrode sheet is larger than the area of ​​the monitoring hole, and the first electrode sheet is attached to the outside of the housing; or, the first electrode sheet is embedded in the monitoring hole; or, the monitoring hole of the housing is provided with a mounting part, and the first electrode sheet is fixed on the mounting part.

6. The battery health monitoring system according to claim 1, characterized in that: The first electrode and the second electrode are integrally formed, the area of ​​the first electrode is larger than the area of ​​the monitoring hole, and the first electrode is attached to the outside of the housing; or, the first electrode is embedded in the monitoring hole; or, the monitoring hole of the housing is provided with a mounting part, and the first electrode and / or the second electrode are fixed on the mounting part. Alternatively, the first electrode and the second electrode are separately disposed, with the area of ​​the first electrode being larger than the area of ​​the monitoring hole, and the first electrode being attached to the outside of the housing; or, the first electrode is embedded in the monitoring hole; or, the monitoring hole of the housing is provided with a mounting part, and the first electrode is fixed to the mounting part; the second electrode is connected to the housing by fasteners, or the second electrode is welded or pasted to the housing, or the second electrode is interference-fitted with the mounting hole of the housing, or the second electrode is detachably fixed to the housing by a fixing seat.

7. The battery health monitoring system according to claim 1, characterized in that: The first electrode sheet includes a first sheet and a first conductive layer on the first sheet, the first conductive layer being located on the surface of the first sheet facing the inductor; the inductor includes a second sheet and a second conductive layer on the second sheet, the second conductive layer being located on the surface of the second sheet facing the first electrode sheet; The first conductive layer is made of the same material as the second conductive layer.

8. The battery health monitoring system according to claim 1, characterized in that: The initial distance between the first electrode and the inductor is d1, and the maximum deformation of the first electrode is d2, which is 50% to 80% of d1.

9. The battery health monitoring system according to claim 1, characterized in that: The battery health monitoring system also includes a resistance monitor electrically connected to the first electrode sheet; Alternatively, the battery health monitoring system may further include an early warning module, which is communicatively connected to the monitoring unit; Alternatively, the battery health monitoring system may further include an early warning module and a control module, wherein the control module is communicatively connected to both the early warning module and the monitoring unit.

10. A vehicle, characterized in that, Includes the battery health monitoring system according to any one of claims 1 to 9.

Images